Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2 | * linux/fs/ext4/namei.c |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 5 | * Remy Card (card@masi.ibp.fr) |
| 6 | * Laboratoire MASI - Institut Blaise Pascal |
| 7 | * Universite Pierre et Marie Curie (Paris VI) |
| 8 | * |
| 9 | * from |
| 10 | * |
| 11 | * linux/fs/minix/namei.c |
| 12 | * |
| 13 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 14 | * |
| 15 | * Big-endian to little-endian byte-swapping/bitmaps by |
| 16 | * David S. Miller (davem@caip.rutgers.edu), 1995 |
| 17 | * Directory entry file type support and forward compatibility hooks |
| 18 | * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998 |
| 19 | * Hash Tree Directory indexing (c) |
| 20 | * Daniel Phillips, 2001 |
| 21 | * Hash Tree Directory indexing porting |
| 22 | * Christopher Li, 2002 |
| 23 | * Hash Tree Directory indexing cleanup |
| 24 | * Theodore Ts'o, 2002 |
| 25 | */ |
| 26 | |
| 27 | #include <linux/fs.h> |
| 28 | #include <linux/pagemap.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 29 | #include <linux/time.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 30 | #include <linux/fcntl.h> |
| 31 | #include <linux/stat.h> |
| 32 | #include <linux/string.h> |
| 33 | #include <linux/quotaops.h> |
| 34 | #include <linux/buffer_head.h> |
| 35 | #include <linux/bio.h> |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 36 | #include "ext4.h" |
| 37 | #include "ext4_jbd2.h" |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 38 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 39 | #include "xattr.h" |
| 40 | #include "acl.h" |
| 41 | |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 42 | #include <trace/events/ext4.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 43 | /* |
| 44 | * define how far ahead to read directories while searching them. |
| 45 | */ |
| 46 | #define NAMEI_RA_CHUNKS 2 |
| 47 | #define NAMEI_RA_BLOCKS 4 |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 48 | #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 49 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 50 | static struct buffer_head *ext4_append(handle_t *handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 51 | struct inode *inode, |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 52 | ext4_lblk_t *block) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 53 | { |
| 54 | struct buffer_head *bh; |
Theodore Ts'o | 1c21502 | 2014-08-29 20:52:15 -0400 | [diff] [blame] | 55 | int err; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 56 | |
Theodore Ts'o | df981d0 | 2012-08-17 09:48:17 -0400 | [diff] [blame] | 57 | if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb && |
| 58 | ((inode->i_size >> 10) >= |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 59 | EXT4_SB(inode->i_sb)->s_max_dir_size_kb))) |
| 60 | return ERR_PTR(-ENOSPC); |
Theodore Ts'o | df981d0 | 2012-08-17 09:48:17 -0400 | [diff] [blame] | 61 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 62 | *block = inode->i_size >> inode->i_sb->s_blocksize_bits; |
| 63 | |
Theodore Ts'o | c5e298a | 2015-06-21 01:25:29 -0400 | [diff] [blame] | 64 | bh = ext4_bread(handle, inode, *block, EXT4_GET_BLOCKS_CREATE); |
Theodore Ts'o | 1c21502 | 2014-08-29 20:52:15 -0400 | [diff] [blame] | 65 | if (IS_ERR(bh)) |
| 66 | return bh; |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 67 | inode->i_size += inode->i_sb->s_blocksize; |
| 68 | EXT4_I(inode)->i_disksize = inode->i_size; |
liang xie | 5d60125 | 2014-05-12 22:06:43 -0400 | [diff] [blame] | 69 | BUFFER_TRACE(bh, "get_write_access"); |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 70 | err = ext4_journal_get_write_access(handle, bh); |
| 71 | if (err) { |
| 72 | brelse(bh); |
| 73 | ext4_std_error(inode->i_sb, err); |
| 74 | return ERR_PTR(err); |
Carlos Maiolino | 6d1ab10 | 2012-09-27 09:31:33 -0400 | [diff] [blame] | 75 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 76 | return bh; |
| 77 | } |
| 78 | |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 79 | static int ext4_dx_csum_verify(struct inode *inode, |
| 80 | struct ext4_dir_entry *dirent); |
| 81 | |
| 82 | typedef enum { |
| 83 | EITHER, INDEX, DIRENT |
| 84 | } dirblock_type_t; |
| 85 | |
| 86 | #define ext4_read_dirblock(inode, block, type) \ |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 87 | __ext4_read_dirblock((inode), (block), (type), __func__, __LINE__) |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 88 | |
| 89 | static struct buffer_head *__ext4_read_dirblock(struct inode *inode, |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 90 | ext4_lblk_t block, |
| 91 | dirblock_type_t type, |
| 92 | const char *func, |
| 93 | unsigned int line) |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 94 | { |
| 95 | struct buffer_head *bh; |
| 96 | struct ext4_dir_entry *dirent; |
Theodore Ts'o | 1c21502 | 2014-08-29 20:52:15 -0400 | [diff] [blame] | 97 | int is_dx_block = 0; |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 98 | |
Theodore Ts'o | 1c21502 | 2014-08-29 20:52:15 -0400 | [diff] [blame] | 99 | bh = ext4_bread(NULL, inode, block, 0); |
| 100 | if (IS_ERR(bh)) { |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 101 | __ext4_warning(inode->i_sb, func, line, |
| 102 | "inode #%lu: lblock %lu: comm %s: " |
| 103 | "error %ld reading directory block", |
| 104 | inode->i_ino, (unsigned long)block, |
| 105 | current->comm, PTR_ERR(bh)); |
Theodore Ts'o | 1c21502 | 2014-08-29 20:52:15 -0400 | [diff] [blame] | 106 | |
| 107 | return bh; |
| 108 | } |
| 109 | if (!bh) { |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 110 | ext4_error_inode(inode, func, line, block, |
| 111 | "Directory hole found"); |
Theodore Ts'o | 1c21502 | 2014-08-29 20:52:15 -0400 | [diff] [blame] | 112 | return ERR_PTR(-EIO); |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 113 | } |
| 114 | dirent = (struct ext4_dir_entry *) bh->b_data; |
| 115 | /* Determine whether or not we have an index block */ |
| 116 | if (is_dx(inode)) { |
| 117 | if (block == 0) |
| 118 | is_dx_block = 1; |
| 119 | else if (ext4_rec_len_from_disk(dirent->rec_len, |
| 120 | inode->i_sb->s_blocksize) == |
| 121 | inode->i_sb->s_blocksize) |
| 122 | is_dx_block = 1; |
| 123 | } |
| 124 | if (!is_dx_block && type == INDEX) { |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 125 | ext4_error_inode(inode, func, line, block, |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 126 | "directory leaf block found instead of index block"); |
| 127 | return ERR_PTR(-EIO); |
| 128 | } |
Dmitry Monakhov | 9aa5d32 | 2014-10-13 03:36:16 -0400 | [diff] [blame] | 129 | if (!ext4_has_metadata_csum(inode->i_sb) || |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 130 | buffer_verified(bh)) |
| 131 | return bh; |
| 132 | |
| 133 | /* |
| 134 | * An empty leaf block can get mistaken for a index block; for |
| 135 | * this reason, we can only check the index checksum when the |
| 136 | * caller is sure it should be an index block. |
| 137 | */ |
| 138 | if (is_dx_block && type == INDEX) { |
| 139 | if (ext4_dx_csum_verify(inode, dirent)) |
| 140 | set_buffer_verified(bh); |
| 141 | else { |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 142 | ext4_error_inode(inode, func, line, block, |
| 143 | "Directory index failed checksum"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 144 | brelse(bh); |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 145 | return ERR_PTR(-EIO); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 146 | } |
| 147 | } |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 148 | if (!is_dx_block) { |
| 149 | if (ext4_dirent_csum_verify(inode, dirent)) |
| 150 | set_buffer_verified(bh); |
| 151 | else { |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 152 | ext4_error_inode(inode, func, line, block, |
| 153 | "Directory block failed checksum"); |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 154 | brelse(bh); |
| 155 | return ERR_PTR(-EIO); |
| 156 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 157 | } |
| 158 | return bh; |
| 159 | } |
| 160 | |
| 161 | #ifndef assert |
| 162 | #define assert(test) J_ASSERT(test) |
| 163 | #endif |
| 164 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 165 | #ifdef DX_DEBUG |
| 166 | #define dxtrace(command) command |
| 167 | #else |
| 168 | #define dxtrace(command) |
| 169 | #endif |
| 170 | |
| 171 | struct fake_dirent |
| 172 | { |
| 173 | __le32 inode; |
| 174 | __le16 rec_len; |
| 175 | u8 name_len; |
| 176 | u8 file_type; |
| 177 | }; |
| 178 | |
| 179 | struct dx_countlimit |
| 180 | { |
| 181 | __le16 limit; |
| 182 | __le16 count; |
| 183 | }; |
| 184 | |
| 185 | struct dx_entry |
| 186 | { |
| 187 | __le32 hash; |
| 188 | __le32 block; |
| 189 | }; |
| 190 | |
| 191 | /* |
| 192 | * dx_root_info is laid out so that if it should somehow get overlaid by a |
| 193 | * dirent the two low bits of the hash version will be zero. Therefore, the |
| 194 | * hash version mod 4 should never be 0. Sincerely, the paranoia department. |
| 195 | */ |
| 196 | |
| 197 | struct dx_root |
| 198 | { |
| 199 | struct fake_dirent dot; |
| 200 | char dot_name[4]; |
| 201 | struct fake_dirent dotdot; |
| 202 | char dotdot_name[4]; |
| 203 | struct dx_root_info |
| 204 | { |
| 205 | __le32 reserved_zero; |
| 206 | u8 hash_version; |
| 207 | u8 info_length; /* 8 */ |
| 208 | u8 indirect_levels; |
| 209 | u8 unused_flags; |
| 210 | } |
| 211 | info; |
| 212 | struct dx_entry entries[0]; |
| 213 | }; |
| 214 | |
| 215 | struct dx_node |
| 216 | { |
| 217 | struct fake_dirent fake; |
| 218 | struct dx_entry entries[0]; |
| 219 | }; |
| 220 | |
| 221 | |
| 222 | struct dx_frame |
| 223 | { |
| 224 | struct buffer_head *bh; |
| 225 | struct dx_entry *entries; |
| 226 | struct dx_entry *at; |
| 227 | }; |
| 228 | |
| 229 | struct dx_map_entry |
| 230 | { |
| 231 | u32 hash; |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 232 | u16 offs; |
| 233 | u16 size; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 234 | }; |
| 235 | |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 236 | /* |
| 237 | * This goes at the end of each htree block. |
| 238 | */ |
| 239 | struct dx_tail { |
| 240 | u32 dt_reserved; |
| 241 | __le32 dt_checksum; /* crc32c(uuid+inum+dirblock) */ |
| 242 | }; |
| 243 | |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 244 | static inline ext4_lblk_t dx_get_block(struct dx_entry *entry); |
| 245 | static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 246 | static inline unsigned dx_get_hash(struct dx_entry *entry); |
| 247 | static void dx_set_hash(struct dx_entry *entry, unsigned value); |
| 248 | static unsigned dx_get_count(struct dx_entry *entries); |
| 249 | static unsigned dx_get_limit(struct dx_entry *entries); |
| 250 | static void dx_set_count(struct dx_entry *entries, unsigned value); |
| 251 | static void dx_set_limit(struct dx_entry *entries, unsigned value); |
| 252 | static unsigned dx_root_limit(struct inode *dir, unsigned infosize); |
| 253 | static unsigned dx_node_limit(struct inode *dir); |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 254 | static struct dx_frame *dx_probe(struct ext4_filename *fname, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 255 | struct inode *dir, |
| 256 | struct dx_hash_info *hinfo, |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 257 | struct dx_frame *frame); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 258 | static void dx_release(struct dx_frame *frames); |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 259 | static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de, |
| 260 | unsigned blocksize, struct dx_hash_info *hinfo, |
| 261 | struct dx_map_entry map[]); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 262 | static void dx_sort_map(struct dx_map_entry *map, unsigned count); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 263 | static struct ext4_dir_entry_2 *dx_move_dirents(char *from, char *to, |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 264 | struct dx_map_entry *offsets, int count, unsigned blocksize); |
Theodore Ts'o | 8bad459 | 2009-02-14 21:46:54 -0500 | [diff] [blame] | 265 | static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize); |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 266 | static void dx_insert_block(struct dx_frame *frame, |
| 267 | u32 hash, ext4_lblk_t block); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 268 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 269 | struct dx_frame *frame, |
| 270 | struct dx_frame *frames, |
| 271 | __u32 *start_hash); |
Theodore Ts'o | f702ba0 | 2008-09-22 15:21:01 -0400 | [diff] [blame] | 272 | static struct buffer_head * ext4_dx_find_entry(struct inode *dir, |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 273 | struct ext4_filename *fname, |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame] | 274 | struct ext4_dir_entry_2 **res_dir); |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 275 | static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, |
| 276 | struct dentry *dentry, struct inode *inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 277 | |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 278 | /* checksumming functions */ |
Tao Ma | 3c47d54 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 279 | void initialize_dirent_tail(struct ext4_dir_entry_tail *t, |
| 280 | unsigned int blocksize) |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 281 | { |
| 282 | memset(t, 0, sizeof(struct ext4_dir_entry_tail)); |
| 283 | t->det_rec_len = ext4_rec_len_to_disk( |
| 284 | sizeof(struct ext4_dir_entry_tail), blocksize); |
| 285 | t->det_reserved_ft = EXT4_FT_DIR_CSUM; |
| 286 | } |
| 287 | |
| 288 | /* Walk through a dirent block to find a checksum "dirent" at the tail */ |
| 289 | static struct ext4_dir_entry_tail *get_dirent_tail(struct inode *inode, |
| 290 | struct ext4_dir_entry *de) |
| 291 | { |
| 292 | struct ext4_dir_entry_tail *t; |
| 293 | |
| 294 | #ifdef PARANOID |
| 295 | struct ext4_dir_entry *d, *top; |
| 296 | |
| 297 | d = de; |
| 298 | top = (struct ext4_dir_entry *)(((void *)de) + |
| 299 | (EXT4_BLOCK_SIZE(inode->i_sb) - |
| 300 | sizeof(struct ext4_dir_entry_tail))); |
| 301 | while (d < top && d->rec_len) |
| 302 | d = (struct ext4_dir_entry *)(((void *)d) + |
| 303 | le16_to_cpu(d->rec_len)); |
| 304 | |
| 305 | if (d != top) |
| 306 | return NULL; |
| 307 | |
| 308 | t = (struct ext4_dir_entry_tail *)d; |
| 309 | #else |
| 310 | t = EXT4_DIRENT_TAIL(de, EXT4_BLOCK_SIZE(inode->i_sb)); |
| 311 | #endif |
| 312 | |
| 313 | if (t->det_reserved_zero1 || |
| 314 | le16_to_cpu(t->det_rec_len) != sizeof(struct ext4_dir_entry_tail) || |
| 315 | t->det_reserved_zero2 || |
| 316 | t->det_reserved_ft != EXT4_FT_DIR_CSUM) |
| 317 | return NULL; |
| 318 | |
| 319 | return t; |
| 320 | } |
| 321 | |
| 322 | static __le32 ext4_dirent_csum(struct inode *inode, |
| 323 | struct ext4_dir_entry *dirent, int size) |
| 324 | { |
| 325 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 326 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 327 | __u32 csum; |
| 328 | |
| 329 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size); |
| 330 | return cpu_to_le32(csum); |
| 331 | } |
| 332 | |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 333 | #define warn_no_space_for_csum(inode) \ |
| 334 | __warn_no_space_for_csum((inode), __func__, __LINE__) |
| 335 | |
| 336 | static void __warn_no_space_for_csum(struct inode *inode, const char *func, |
| 337 | unsigned int line) |
Theodore Ts'o | dffe9d8 | 2012-11-10 22:20:05 -0500 | [diff] [blame] | 338 | { |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 339 | __ext4_warning_inode(inode, func, line, |
| 340 | "No space for directory leaf checksum. Please run e2fsck -D."); |
Theodore Ts'o | dffe9d8 | 2012-11-10 22:20:05 -0500 | [diff] [blame] | 341 | } |
| 342 | |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 343 | int ext4_dirent_csum_verify(struct inode *inode, struct ext4_dir_entry *dirent) |
| 344 | { |
| 345 | struct ext4_dir_entry_tail *t; |
| 346 | |
Dmitry Monakhov | 9aa5d32 | 2014-10-13 03:36:16 -0400 | [diff] [blame] | 347 | if (!ext4_has_metadata_csum(inode->i_sb)) |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 348 | return 1; |
| 349 | |
| 350 | t = get_dirent_tail(inode, dirent); |
| 351 | if (!t) { |
Theodore Ts'o | dffe9d8 | 2012-11-10 22:20:05 -0500 | [diff] [blame] | 352 | warn_no_space_for_csum(inode); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 353 | return 0; |
| 354 | } |
| 355 | |
| 356 | if (t->det_checksum != ext4_dirent_csum(inode, dirent, |
| 357 | (void *)t - (void *)dirent)) |
| 358 | return 0; |
| 359 | |
| 360 | return 1; |
| 361 | } |
| 362 | |
| 363 | static void ext4_dirent_csum_set(struct inode *inode, |
| 364 | struct ext4_dir_entry *dirent) |
| 365 | { |
| 366 | struct ext4_dir_entry_tail *t; |
| 367 | |
Dmitry Monakhov | 9aa5d32 | 2014-10-13 03:36:16 -0400 | [diff] [blame] | 368 | if (!ext4_has_metadata_csum(inode->i_sb)) |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 369 | return; |
| 370 | |
| 371 | t = get_dirent_tail(inode, dirent); |
| 372 | if (!t) { |
Theodore Ts'o | dffe9d8 | 2012-11-10 22:20:05 -0500 | [diff] [blame] | 373 | warn_no_space_for_csum(inode); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 374 | return; |
| 375 | } |
| 376 | |
| 377 | t->det_checksum = ext4_dirent_csum(inode, dirent, |
| 378 | (void *)t - (void *)dirent); |
| 379 | } |
| 380 | |
Tao Ma | 3c47d54 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 381 | int ext4_handle_dirty_dirent_node(handle_t *handle, |
| 382 | struct inode *inode, |
| 383 | struct buffer_head *bh) |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 384 | { |
| 385 | ext4_dirent_csum_set(inode, (struct ext4_dir_entry *)bh->b_data); |
| 386 | return ext4_handle_dirty_metadata(handle, inode, bh); |
| 387 | } |
| 388 | |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 389 | static struct dx_countlimit *get_dx_countlimit(struct inode *inode, |
| 390 | struct ext4_dir_entry *dirent, |
| 391 | int *offset) |
| 392 | { |
| 393 | struct ext4_dir_entry *dp; |
| 394 | struct dx_root_info *root; |
| 395 | int count_offset; |
| 396 | |
| 397 | if (le16_to_cpu(dirent->rec_len) == EXT4_BLOCK_SIZE(inode->i_sb)) |
| 398 | count_offset = 8; |
| 399 | else if (le16_to_cpu(dirent->rec_len) == 12) { |
| 400 | dp = (struct ext4_dir_entry *)(((void *)dirent) + 12); |
| 401 | if (le16_to_cpu(dp->rec_len) != |
| 402 | EXT4_BLOCK_SIZE(inode->i_sb) - 12) |
| 403 | return NULL; |
| 404 | root = (struct dx_root_info *)(((void *)dp + 12)); |
| 405 | if (root->reserved_zero || |
| 406 | root->info_length != sizeof(struct dx_root_info)) |
| 407 | return NULL; |
| 408 | count_offset = 32; |
| 409 | } else |
| 410 | return NULL; |
| 411 | |
| 412 | if (offset) |
| 413 | *offset = count_offset; |
| 414 | return (struct dx_countlimit *)(((void *)dirent) + count_offset); |
| 415 | } |
| 416 | |
| 417 | static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent, |
| 418 | int count_offset, int count, struct dx_tail *t) |
| 419 | { |
| 420 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 421 | struct ext4_inode_info *ei = EXT4_I(inode); |
Theodore Ts'o | d6a7710 | 2013-04-09 23:59:55 -0400 | [diff] [blame] | 422 | __u32 csum; |
| 423 | __le32 save_csum; |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 424 | int size; |
| 425 | |
| 426 | size = count_offset + (count * sizeof(struct dx_entry)); |
Theodore Ts'o | d6a7710 | 2013-04-09 23:59:55 -0400 | [diff] [blame] | 427 | save_csum = t->dt_checksum; |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 428 | t->dt_checksum = 0; |
| 429 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size); |
| 430 | csum = ext4_chksum(sbi, csum, (__u8 *)t, sizeof(struct dx_tail)); |
Theodore Ts'o | d6a7710 | 2013-04-09 23:59:55 -0400 | [diff] [blame] | 431 | t->dt_checksum = save_csum; |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 432 | |
| 433 | return cpu_to_le32(csum); |
| 434 | } |
| 435 | |
| 436 | static int ext4_dx_csum_verify(struct inode *inode, |
| 437 | struct ext4_dir_entry *dirent) |
| 438 | { |
| 439 | struct dx_countlimit *c; |
| 440 | struct dx_tail *t; |
| 441 | int count_offset, limit, count; |
| 442 | |
Dmitry Monakhov | 9aa5d32 | 2014-10-13 03:36:16 -0400 | [diff] [blame] | 443 | if (!ext4_has_metadata_csum(inode->i_sb)) |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 444 | return 1; |
| 445 | |
| 446 | c = get_dx_countlimit(inode, dirent, &count_offset); |
| 447 | if (!c) { |
| 448 | EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D."); |
| 449 | return 1; |
| 450 | } |
| 451 | limit = le16_to_cpu(c->limit); |
| 452 | count = le16_to_cpu(c->count); |
| 453 | if (count_offset + (limit * sizeof(struct dx_entry)) > |
| 454 | EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) { |
Theodore Ts'o | dffe9d8 | 2012-11-10 22:20:05 -0500 | [diff] [blame] | 455 | warn_no_space_for_csum(inode); |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 456 | return 1; |
| 457 | } |
| 458 | t = (struct dx_tail *)(((struct dx_entry *)c) + limit); |
| 459 | |
| 460 | if (t->dt_checksum != ext4_dx_csum(inode, dirent, count_offset, |
| 461 | count, t)) |
| 462 | return 0; |
| 463 | return 1; |
| 464 | } |
| 465 | |
| 466 | static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent) |
| 467 | { |
| 468 | struct dx_countlimit *c; |
| 469 | struct dx_tail *t; |
| 470 | int count_offset, limit, count; |
| 471 | |
Dmitry Monakhov | 9aa5d32 | 2014-10-13 03:36:16 -0400 | [diff] [blame] | 472 | if (!ext4_has_metadata_csum(inode->i_sb)) |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 473 | return; |
| 474 | |
| 475 | c = get_dx_countlimit(inode, dirent, &count_offset); |
| 476 | if (!c) { |
| 477 | EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D."); |
| 478 | return; |
| 479 | } |
| 480 | limit = le16_to_cpu(c->limit); |
| 481 | count = le16_to_cpu(c->count); |
| 482 | if (count_offset + (limit * sizeof(struct dx_entry)) > |
| 483 | EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) { |
Theodore Ts'o | dffe9d8 | 2012-11-10 22:20:05 -0500 | [diff] [blame] | 484 | warn_no_space_for_csum(inode); |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 485 | return; |
| 486 | } |
| 487 | t = (struct dx_tail *)(((struct dx_entry *)c) + limit); |
| 488 | |
| 489 | t->dt_checksum = ext4_dx_csum(inode, dirent, count_offset, count, t); |
| 490 | } |
| 491 | |
| 492 | static inline int ext4_handle_dirty_dx_node(handle_t *handle, |
| 493 | struct inode *inode, |
| 494 | struct buffer_head *bh) |
| 495 | { |
| 496 | ext4_dx_csum_set(inode, (struct ext4_dir_entry *)bh->b_data); |
| 497 | return ext4_handle_dirty_metadata(handle, inode, bh); |
| 498 | } |
| 499 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 500 | /* |
Li Zefan | f795e14 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 501 | * p is at least 6 bytes before the end of page |
| 502 | */ |
| 503 | static inline struct ext4_dir_entry_2 * |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 504 | ext4_next_entry(struct ext4_dir_entry_2 *p, unsigned long blocksize) |
Li Zefan | f795e14 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 505 | { |
| 506 | return (struct ext4_dir_entry_2 *)((char *)p + |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 507 | ext4_rec_len_from_disk(p->rec_len, blocksize)); |
Li Zefan | f795e14 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 508 | } |
| 509 | |
| 510 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 511 | * Future: use high four bits of block for coalesce-on-delete flags |
| 512 | * Mask them off for now. |
| 513 | */ |
| 514 | |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 515 | static inline ext4_lblk_t dx_get_block(struct dx_entry *entry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 516 | { |
| 517 | return le32_to_cpu(entry->block) & 0x00ffffff; |
| 518 | } |
| 519 | |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 520 | static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 521 | { |
| 522 | entry->block = cpu_to_le32(value); |
| 523 | } |
| 524 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 525 | static inline unsigned dx_get_hash(struct dx_entry *entry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 526 | { |
| 527 | return le32_to_cpu(entry->hash); |
| 528 | } |
| 529 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 530 | static inline void dx_set_hash(struct dx_entry *entry, unsigned value) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 531 | { |
| 532 | entry->hash = cpu_to_le32(value); |
| 533 | } |
| 534 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 535 | static inline unsigned dx_get_count(struct dx_entry *entries) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 536 | { |
| 537 | return le16_to_cpu(((struct dx_countlimit *) entries)->count); |
| 538 | } |
| 539 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 540 | static inline unsigned dx_get_limit(struct dx_entry *entries) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 541 | { |
| 542 | return le16_to_cpu(((struct dx_countlimit *) entries)->limit); |
| 543 | } |
| 544 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 545 | static inline void dx_set_count(struct dx_entry *entries, unsigned value) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 546 | { |
| 547 | ((struct dx_countlimit *) entries)->count = cpu_to_le16(value); |
| 548 | } |
| 549 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 550 | static inline void dx_set_limit(struct dx_entry *entries, unsigned value) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 551 | { |
| 552 | ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value); |
| 553 | } |
| 554 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 555 | static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 556 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 557 | unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) - |
| 558 | EXT4_DIR_REC_LEN(2) - infosize; |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 559 | |
Dmitry Monakhov | 9aa5d32 | 2014-10-13 03:36:16 -0400 | [diff] [blame] | 560 | if (ext4_has_metadata_csum(dir->i_sb)) |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 561 | entry_space -= sizeof(struct dx_tail); |
Li Zefan | d9c769b | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 562 | return entry_space / sizeof(struct dx_entry); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 563 | } |
| 564 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 565 | static inline unsigned dx_node_limit(struct inode *dir) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 566 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 567 | unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0); |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 568 | |
Dmitry Monakhov | 9aa5d32 | 2014-10-13 03:36:16 -0400 | [diff] [blame] | 569 | if (ext4_has_metadata_csum(dir->i_sb)) |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 570 | entry_space -= sizeof(struct dx_tail); |
Li Zefan | d9c769b | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 571 | return entry_space / sizeof(struct dx_entry); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 572 | } |
| 573 | |
| 574 | /* |
| 575 | * Debug |
| 576 | */ |
| 577 | #ifdef DX_DEBUG |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 578 | static void dx_show_index(char * label, struct dx_entry *entries) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 579 | { |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 580 | int i, n = dx_get_count (entries); |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 581 | printk(KERN_DEBUG "%s index ", label); |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 582 | for (i = 0; i < n; i++) { |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 583 | printk("%x->%lu ", i ? dx_get_hash(entries + i) : |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 584 | 0, (unsigned long)dx_get_block(entries + i)); |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 585 | } |
| 586 | printk("\n"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 587 | } |
| 588 | |
| 589 | struct stats |
| 590 | { |
| 591 | unsigned names; |
| 592 | unsigned space; |
| 593 | unsigned bcount; |
| 594 | }; |
| 595 | |
Michael Halcrow | b309848 | 2015-04-12 01:07:01 -0400 | [diff] [blame] | 596 | static struct stats dx_show_leaf(struct inode *dir, |
| 597 | struct dx_hash_info *hinfo, |
| 598 | struct ext4_dir_entry_2 *de, |
| 599 | int size, int show_names) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 600 | { |
| 601 | unsigned names = 0, space = 0; |
| 602 | char *base = (char *) de; |
| 603 | struct dx_hash_info h = *hinfo; |
| 604 | |
| 605 | printk("names: "); |
| 606 | while ((char *) de < base + size) |
| 607 | { |
| 608 | if (de->inode) |
| 609 | { |
| 610 | if (show_names) |
| 611 | { |
Michael Halcrow | b309848 | 2015-04-12 01:07:01 -0400 | [diff] [blame] | 612 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
| 613 | int len; |
| 614 | char *name; |
| 615 | struct ext4_str fname_crypto_str |
| 616 | = {.name = NULL, .len = 0}; |
Theodore Ts'o | c936e1e | 2015-05-31 13:34:22 -0400 | [diff] [blame] | 617 | int res = 0; |
Michael Halcrow | b309848 | 2015-04-12 01:07:01 -0400 | [diff] [blame] | 618 | |
| 619 | name = de->name; |
| 620 | len = de->name_len; |
Theodore Ts'o | c936e1e | 2015-05-31 13:34:22 -0400 | [diff] [blame] | 621 | if (ext4_encrypted_inode(inode)) |
| 622 | res = ext4_get_encryption_info(dir); |
Theodore Ts'o | b7236e2 | 2015-05-18 13:17:47 -0400 | [diff] [blame] | 623 | if (res) { |
| 624 | printk(KERN_WARNING "Error setting up" |
| 625 | " fname crypto: %d\n", res); |
Michael Halcrow | b309848 | 2015-04-12 01:07:01 -0400 | [diff] [blame] | 626 | } |
| 627 | if (ctx == NULL) { |
| 628 | /* Directory is not encrypted */ |
| 629 | ext4fs_dirhash(de->name, |
| 630 | de->name_len, &h); |
| 631 | printk("%*.s:(U)%x.%u ", len, |
| 632 | name, h.hash, |
| 633 | (unsigned) ((char *) de |
| 634 | - base)); |
| 635 | } else { |
| 636 | /* Directory is encrypted */ |
| 637 | res = ext4_fname_crypto_alloc_buffer( |
| 638 | ctx, de->name_len, |
| 639 | &fname_crypto_str); |
| 640 | if (res < 0) { |
| 641 | printk(KERN_WARNING "Error " |
| 642 | "allocating crypto " |
| 643 | "buffer--skipping " |
| 644 | "crypto\n"); |
Michael Halcrow | b309848 | 2015-04-12 01:07:01 -0400 | [diff] [blame] | 645 | ctx = NULL; |
| 646 | } |
Theodore Ts'o | 5de0b4d | 2015-05-01 16:56:45 -0400 | [diff] [blame] | 647 | res = ext4_fname_disk_to_usr(ctx, NULL, de, |
Michael Halcrow | b309848 | 2015-04-12 01:07:01 -0400 | [diff] [blame] | 648 | &fname_crypto_str); |
| 649 | if (res < 0) { |
| 650 | printk(KERN_WARNING "Error " |
| 651 | "converting filename " |
| 652 | "from disk to usr" |
| 653 | "\n"); |
| 654 | name = "??"; |
| 655 | len = 2; |
| 656 | } else { |
| 657 | name = fname_crypto_str.name; |
| 658 | len = fname_crypto_str.len; |
| 659 | } |
Theodore Ts'o | 5de0b4d | 2015-05-01 16:56:45 -0400 | [diff] [blame] | 660 | ext4fs_dirhash(de->name, de->name_len, |
| 661 | &h); |
Michael Halcrow | b309848 | 2015-04-12 01:07:01 -0400 | [diff] [blame] | 662 | printk("%*.s:(E)%x.%u ", len, name, |
| 663 | h.hash, (unsigned) ((char *) de |
| 664 | - base)); |
Michael Halcrow | b309848 | 2015-04-12 01:07:01 -0400 | [diff] [blame] | 665 | ext4_fname_crypto_free_buffer( |
| 666 | &fname_crypto_str); |
| 667 | } |
| 668 | #else |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 669 | int len = de->name_len; |
| 670 | char *name = de->name; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 671 | ext4fs_dirhash(de->name, de->name_len, &h); |
Michael Halcrow | b309848 | 2015-04-12 01:07:01 -0400 | [diff] [blame] | 672 | printk("%*.s:%x.%u ", len, name, h.hash, |
Bernd Schubert | 265c6a0 | 2011-07-16 19:41:23 -0400 | [diff] [blame] | 673 | (unsigned) ((char *) de - base)); |
Michael Halcrow | b309848 | 2015-04-12 01:07:01 -0400 | [diff] [blame] | 674 | #endif |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 675 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 676 | space += EXT4_DIR_REC_LEN(de->name_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 677 | names++; |
| 678 | } |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 679 | de = ext4_next_entry(de, size); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 680 | } |
| 681 | printk("(%i)\n", names); |
| 682 | return (struct stats) { names, space, 1 }; |
| 683 | } |
| 684 | |
| 685 | struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir, |
| 686 | struct dx_entry *entries, int levels) |
| 687 | { |
| 688 | unsigned blocksize = dir->i_sb->s_blocksize; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 689 | unsigned count = dx_get_count(entries), names = 0, space = 0, i; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 690 | unsigned bcount = 0; |
| 691 | struct buffer_head *bh; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 692 | printk("%i indexed blocks...\n", count); |
| 693 | for (i = 0; i < count; i++, entries++) |
| 694 | { |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 695 | ext4_lblk_t block = dx_get_block(entries); |
| 696 | ext4_lblk_t hash = i ? dx_get_hash(entries): 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 697 | u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash; |
| 698 | struct stats stats; |
| 699 | printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range); |
Theodore Ts'o | 1c21502 | 2014-08-29 20:52:15 -0400 | [diff] [blame] | 700 | bh = ext4_bread(NULL,dir, block, 0); |
| 701 | if (!bh || IS_ERR(bh)) |
| 702 | continue; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 703 | stats = levels? |
| 704 | dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1): |
Michael Halcrow | b309848 | 2015-04-12 01:07:01 -0400 | [diff] [blame] | 705 | dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) |
| 706 | bh->b_data, blocksize, 0); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 707 | names += stats.names; |
| 708 | space += stats.space; |
| 709 | bcount += stats.bcount; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 710 | brelse(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 711 | } |
| 712 | if (bcount) |
Theodore Ts'o | 60e6679 | 2010-05-17 07:00:00 -0400 | [diff] [blame] | 713 | printk(KERN_DEBUG "%snames %u, fullness %u (%u%%)\n", |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 714 | levels ? "" : " ", names, space/bcount, |
| 715 | (space/bcount)*100/blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 716 | return (struct stats) { names, space, bcount}; |
| 717 | } |
| 718 | #endif /* DX_DEBUG */ |
| 719 | |
| 720 | /* |
| 721 | * Probe for a directory leaf block to search. |
| 722 | * |
| 723 | * dx_probe can return ERR_BAD_DX_DIR, which means there was a format |
| 724 | * error in the directory index, and the caller should fall back to |
| 725 | * searching the directory normally. The callers of dx_probe **MUST** |
| 726 | * check for this error code, and make sure it never gets reflected |
| 727 | * back to userspace. |
| 728 | */ |
| 729 | static struct dx_frame * |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 730 | dx_probe(struct ext4_filename *fname, struct inode *dir, |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 731 | struct dx_hash_info *hinfo, struct dx_frame *frame_in) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 732 | { |
| 733 | unsigned count, indirect; |
| 734 | struct dx_entry *at, *entries, *p, *q, *m; |
| 735 | struct dx_root *root; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 736 | struct dx_frame *frame = frame_in; |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 737 | struct dx_frame *ret_err = ERR_PTR(ERR_BAD_DX_DIR); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 738 | u32 hash; |
| 739 | |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 740 | frame->bh = ext4_read_dirblock(dir, 0, INDEX); |
| 741 | if (IS_ERR(frame->bh)) |
| 742 | return (struct dx_frame *) frame->bh; |
| 743 | |
| 744 | root = (struct dx_root *) frame->bh->b_data; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 745 | if (root->info.hash_version != DX_HASH_TEA && |
| 746 | root->info.hash_version != DX_HASH_HALF_MD4 && |
| 747 | root->info.hash_version != DX_HASH_LEGACY) { |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 748 | ext4_warning_inode(dir, "Unrecognised inode hash code %u", |
| 749 | root->info.hash_version); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 750 | goto fail; |
| 751 | } |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 752 | if (fname) |
| 753 | hinfo = &fname->hinfo; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 754 | hinfo->hash_version = root->info.hash_version; |
Theodore Ts'o | f99b258 | 2008-10-28 13:21:44 -0400 | [diff] [blame] | 755 | if (hinfo->hash_version <= DX_HASH_TEA) |
| 756 | hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 757 | hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 758 | if (fname && fname_name(fname)) |
| 759 | ext4fs_dirhash(fname_name(fname), fname_len(fname), hinfo); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 760 | hash = hinfo->hash; |
| 761 | |
| 762 | if (root->info.unused_flags & 1) { |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 763 | ext4_warning_inode(dir, "Unimplemented hash flags: %#06x", |
| 764 | root->info.unused_flags); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 765 | goto fail; |
| 766 | } |
| 767 | |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 768 | indirect = root->info.indirect_levels; |
| 769 | if (indirect > 1) { |
| 770 | ext4_warning_inode(dir, "Unimplemented hash depth: %#06x", |
| 771 | root->info.indirect_levels); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 772 | goto fail; |
| 773 | } |
| 774 | |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 775 | entries = (struct dx_entry *)(((char *)&root->info) + |
| 776 | root->info.info_length); |
Eric Sandeen | 3d82aba | 2007-09-18 22:46:38 -0700 | [diff] [blame] | 777 | |
| 778 | if (dx_get_limit(entries) != dx_root_limit(dir, |
| 779 | root->info.info_length)) { |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 780 | ext4_warning_inode(dir, "dx entry: limit %u != root limit %u", |
| 781 | dx_get_limit(entries), |
| 782 | dx_root_limit(dir, root->info.info_length)); |
Eric Sandeen | 3d82aba | 2007-09-18 22:46:38 -0700 | [diff] [blame] | 783 | goto fail; |
| 784 | } |
| 785 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 786 | dxtrace(printk("Look up %x", hash)); |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 787 | while (1) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 788 | count = dx_get_count(entries); |
Eric Sandeen | 3d82aba | 2007-09-18 22:46:38 -0700 | [diff] [blame] | 789 | if (!count || count > dx_get_limit(entries)) { |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 790 | ext4_warning_inode(dir, |
| 791 | "dx entry: count %u beyond limit %u", |
| 792 | count, dx_get_limit(entries)); |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 793 | goto fail; |
Eric Sandeen | 3d82aba | 2007-09-18 22:46:38 -0700 | [diff] [blame] | 794 | } |
| 795 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 796 | p = entries + 1; |
| 797 | q = entries + count - 1; |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 798 | while (p <= q) { |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 799 | m = p + (q - p) / 2; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 800 | dxtrace(printk(".")); |
| 801 | if (dx_get_hash(m) > hash) |
| 802 | q = m - 1; |
| 803 | else |
| 804 | p = m + 1; |
| 805 | } |
| 806 | |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 807 | if (0) { // linear search cross check |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 808 | unsigned n = count - 1; |
| 809 | at = entries; |
| 810 | while (n--) |
| 811 | { |
| 812 | dxtrace(printk(",")); |
| 813 | if (dx_get_hash(++at) > hash) |
| 814 | { |
| 815 | at--; |
| 816 | break; |
| 817 | } |
| 818 | } |
| 819 | assert (at == p - 1); |
| 820 | } |
| 821 | |
| 822 | at = p - 1; |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 823 | dxtrace(printk(" %x->%u\n", at == entries ? 0 : dx_get_hash(at), |
| 824 | dx_get_block(at))); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 825 | frame->entries = entries; |
| 826 | frame->at = at; |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 827 | if (!indirect--) |
| 828 | return frame; |
| 829 | frame++; |
| 830 | frame->bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX); |
| 831 | if (IS_ERR(frame->bh)) { |
| 832 | ret_err = (struct dx_frame *) frame->bh; |
| 833 | frame->bh = NULL; |
| 834 | goto fail; |
Carlos Maiolino | 6d1ab10 | 2012-09-27 09:31:33 -0400 | [diff] [blame] | 835 | } |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 836 | entries = ((struct dx_node *) frame->bh->b_data)->entries; |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 837 | |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 838 | if (dx_get_limit(entries) != dx_node_limit(dir)) { |
| 839 | ext4_warning_inode(dir, |
| 840 | "dx entry: limit %u != node limit %u", |
| 841 | dx_get_limit(entries), dx_node_limit(dir)); |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 842 | goto fail; |
Eric Sandeen | 3d82aba | 2007-09-18 22:46:38 -0700 | [diff] [blame] | 843 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 844 | } |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 845 | fail: |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 846 | while (frame >= frame_in) { |
| 847 | brelse(frame->bh); |
| 848 | frame--; |
| 849 | } |
Michael Halcrow | b309848 | 2015-04-12 01:07:01 -0400 | [diff] [blame] | 850 | |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 851 | if (ret_err == ERR_PTR(ERR_BAD_DX_DIR)) |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 852 | ext4_warning_inode(dir, |
| 853 | "Corrupt directory, running e2fsck is recommended"); |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 854 | return ret_err; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 855 | } |
| 856 | |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 857 | static void dx_release(struct dx_frame *frames) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 858 | { |
| 859 | if (frames[0].bh == NULL) |
| 860 | return; |
| 861 | |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 862 | if (((struct dx_root *)frames[0].bh->b_data)->info.indirect_levels) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 863 | brelse(frames[1].bh); |
| 864 | brelse(frames[0].bh); |
| 865 | } |
| 866 | |
| 867 | /* |
| 868 | * This function increments the frame pointer to search the next leaf |
| 869 | * block, and reads in the necessary intervening nodes if the search |
| 870 | * should be necessary. Whether or not the search is necessary is |
| 871 | * controlled by the hash parameter. If the hash value is even, then |
| 872 | * the search is only continued if the next block starts with that |
| 873 | * hash value. This is used if we are searching for a specific file. |
| 874 | * |
| 875 | * If the hash value is HASH_NB_ALWAYS, then always go to the next block. |
| 876 | * |
| 877 | * This function returns 1 if the caller should continue to search, |
| 878 | * or 0 if it should not. If there is an error reading one of the |
| 879 | * index blocks, it will a negative error code. |
| 880 | * |
| 881 | * If start_hash is non-null, it will be filled in with the starting |
| 882 | * hash of the next page. |
| 883 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 884 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 885 | struct dx_frame *frame, |
| 886 | struct dx_frame *frames, |
| 887 | __u32 *start_hash) |
| 888 | { |
| 889 | struct dx_frame *p; |
| 890 | struct buffer_head *bh; |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 891 | int num_frames = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 892 | __u32 bhash; |
| 893 | |
| 894 | p = frame; |
| 895 | /* |
| 896 | * Find the next leaf page by incrementing the frame pointer. |
| 897 | * If we run out of entries in the interior node, loop around and |
| 898 | * increment pointer in the parent node. When we break out of |
| 899 | * this loop, num_frames indicates the number of interior |
| 900 | * nodes need to be read. |
| 901 | */ |
| 902 | while (1) { |
| 903 | if (++(p->at) < p->entries + dx_get_count(p->entries)) |
| 904 | break; |
| 905 | if (p == frames) |
| 906 | return 0; |
| 907 | num_frames++; |
| 908 | p--; |
| 909 | } |
| 910 | |
| 911 | /* |
| 912 | * If the hash is 1, then continue only if the next page has a |
| 913 | * continuation hash of any value. This is used for readdir |
| 914 | * handling. Otherwise, check to see if the hash matches the |
| 915 | * desired contiuation hash. If it doesn't, return since |
| 916 | * there's no point to read in the successive index pages. |
| 917 | */ |
| 918 | bhash = dx_get_hash(p->at); |
| 919 | if (start_hash) |
| 920 | *start_hash = bhash; |
| 921 | if ((hash & 1) == 0) { |
| 922 | if ((bhash & ~1) != hash) |
| 923 | return 0; |
| 924 | } |
| 925 | /* |
| 926 | * If the hash is HASH_NB_ALWAYS, we always go to the next |
| 927 | * block so no check is necessary |
| 928 | */ |
| 929 | while (num_frames--) { |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 930 | bh = ext4_read_dirblock(dir, dx_get_block(p->at), INDEX); |
| 931 | if (IS_ERR(bh)) |
| 932 | return PTR_ERR(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 933 | p++; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 934 | brelse(p->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 935 | p->bh = bh; |
| 936 | p->at = p->entries = ((struct dx_node *) bh->b_data)->entries; |
| 937 | } |
| 938 | return 1; |
| 939 | } |
| 940 | |
| 941 | |
| 942 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 943 | * This function fills a red-black tree with information from a |
| 944 | * directory block. It returns the number directory entries loaded |
| 945 | * into the tree. If there is an error it is returned in err. |
| 946 | */ |
| 947 | static int htree_dirblock_to_tree(struct file *dir_file, |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 948 | struct inode *dir, ext4_lblk_t block, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 949 | struct dx_hash_info *hinfo, |
| 950 | __u32 start_hash, __u32 start_minor_hash) |
| 951 | { |
| 952 | struct buffer_head *bh; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 953 | struct ext4_dir_entry_2 *de, *top; |
Carlos Maiolino | 90b0a97 | 2012-09-17 23:39:12 -0400 | [diff] [blame] | 954 | int err = 0, count = 0; |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 955 | struct ext4_str fname_crypto_str = {.name = NULL, .len = 0}, tmp_str; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 956 | |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 957 | dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n", |
| 958 | (unsigned long)block)); |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 959 | bh = ext4_read_dirblock(dir, block, DIRENT); |
| 960 | if (IS_ERR(bh)) |
| 961 | return PTR_ERR(bh); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 962 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 963 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
| 964 | top = (struct ext4_dir_entry_2 *) ((char *) de + |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 965 | dir->i_sb->s_blocksize - |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 966 | EXT4_DIR_REC_LEN(0)); |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 967 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
| 968 | /* Check if the directory is encrypted */ |
Theodore Ts'o | b7236e2 | 2015-05-18 13:17:47 -0400 | [diff] [blame] | 969 | if (ext4_encrypted_inode(dir)) { |
Theodore Ts'o | c936e1e | 2015-05-31 13:34:22 -0400 | [diff] [blame] | 970 | err = ext4_get_encryption_info(dir); |
| 971 | if (err < 0) { |
| 972 | brelse(bh); |
| 973 | return err; |
| 974 | } |
Theodore Ts'o | b7236e2 | 2015-05-18 13:17:47 -0400 | [diff] [blame] | 975 | err = ext4_fname_crypto_alloc_buffer(dir, EXT4_NAME_LEN, |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 976 | &fname_crypto_str); |
| 977 | if (err < 0) { |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 978 | brelse(bh); |
| 979 | return err; |
| 980 | } |
| 981 | } |
| 982 | #endif |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 983 | for (; de < top; de = ext4_next_entry(de, dir->i_sb->s_blocksize)) { |
Theodore Ts'o | f7c2117 | 2011-01-10 12:10:55 -0500 | [diff] [blame] | 984 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
Tao Ma | 226ba97 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 985 | bh->b_data, bh->b_size, |
Theodore Ts'o | cad3f00 | 2010-12-19 22:07:02 -0500 | [diff] [blame] | 986 | (block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb)) |
| 987 | + ((char *)de - bh->b_data))) { |
Al Viro | 64cb927 | 2013-07-01 08:12:38 -0400 | [diff] [blame] | 988 | /* silently ignore the rest of the block */ |
| 989 | break; |
Eric Sandeen | e6c4021 | 2006-12-06 20:36:28 -0800 | [diff] [blame] | 990 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 991 | ext4fs_dirhash(de->name, de->name_len, hinfo); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 992 | if ((hinfo->hash < start_hash) || |
| 993 | ((hinfo->hash == start_hash) && |
| 994 | (hinfo->minor_hash < start_minor_hash))) |
| 995 | continue; |
| 996 | if (de->inode == 0) |
| 997 | continue; |
Theodore Ts'o | b7236e2 | 2015-05-18 13:17:47 -0400 | [diff] [blame] | 998 | if (!ext4_encrypted_inode(dir)) { |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 999 | tmp_str.name = de->name; |
| 1000 | tmp_str.len = de->name_len; |
| 1001 | err = ext4_htree_store_dirent(dir_file, |
| 1002 | hinfo->hash, hinfo->minor_hash, de, |
| 1003 | &tmp_str); |
| 1004 | } else { |
Theodore Ts'o | d229959 | 2015-05-18 13:15:47 -0400 | [diff] [blame] | 1005 | int save_len = fname_crypto_str.len; |
| 1006 | |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1007 | /* Directory is encrypted */ |
Theodore Ts'o | b7236e2 | 2015-05-18 13:17:47 -0400 | [diff] [blame] | 1008 | err = ext4_fname_disk_to_usr(dir, hinfo, de, |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1009 | &fname_crypto_str); |
| 1010 | if (err < 0) { |
| 1011 | count = err; |
| 1012 | goto errout; |
| 1013 | } |
| 1014 | err = ext4_htree_store_dirent(dir_file, |
| 1015 | hinfo->hash, hinfo->minor_hash, de, |
| 1016 | &fname_crypto_str); |
Theodore Ts'o | d229959 | 2015-05-18 13:15:47 -0400 | [diff] [blame] | 1017 | fname_crypto_str.len = save_len; |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1018 | } |
Theodore Ts'o | 2f61830 | 2015-04-12 00:56:26 -0400 | [diff] [blame] | 1019 | if (err != 0) { |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1020 | count = err; |
| 1021 | goto errout; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1022 | } |
| 1023 | count++; |
| 1024 | } |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1025 | errout: |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1026 | brelse(bh); |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1027 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1028 | ext4_fname_crypto_free_buffer(&fname_crypto_str); |
| 1029 | #endif |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1030 | return count; |
| 1031 | } |
| 1032 | |
| 1033 | |
| 1034 | /* |
| 1035 | * This function fills a red-black tree with information from a |
| 1036 | * directory. We start scanning the directory in hash order, starting |
| 1037 | * at start_hash and start_minor_hash. |
| 1038 | * |
| 1039 | * This function returns the number of entries inserted into the tree, |
| 1040 | * or a negative error code. |
| 1041 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1042 | int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1043 | __u32 start_minor_hash, __u32 *next_hash) |
| 1044 | { |
| 1045 | struct dx_hash_info hinfo; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1046 | struct ext4_dir_entry_2 *de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1047 | struct dx_frame frames[2], *frame; |
| 1048 | struct inode *dir; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1049 | ext4_lblk_t block; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1050 | int count = 0; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1051 | int ret, err; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1052 | __u32 hashval; |
Theodore Ts'o | 2f61830 | 2015-04-12 00:56:26 -0400 | [diff] [blame] | 1053 | struct ext4_str tmp_str; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1054 | |
Theodore Ts'o | 60e6679 | 2010-05-17 07:00:00 -0400 | [diff] [blame] | 1055 | dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n", |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 1056 | start_hash, start_minor_hash)); |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1057 | dir = file_inode(dir_file); |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 1058 | if (!(ext4_test_inode_flag(dir, EXT4_INODE_INDEX))) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1059 | hinfo.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version; |
Theodore Ts'o | f99b258 | 2008-10-28 13:21:44 -0400 | [diff] [blame] | 1060 | if (hinfo.hash_version <= DX_HASH_TEA) |
| 1061 | hinfo.hash_version += |
| 1062 | EXT4_SB(dir->i_sb)->s_hash_unsigned; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1063 | hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
Tao Ma | 8af0f08 | 2013-04-19 17:53:09 -0400 | [diff] [blame] | 1064 | if (ext4_has_inline_data(dir)) { |
| 1065 | int has_inline_data = 1; |
| 1066 | count = htree_inlinedir_to_tree(dir_file, dir, 0, |
| 1067 | &hinfo, start_hash, |
| 1068 | start_minor_hash, |
| 1069 | &has_inline_data); |
| 1070 | if (has_inline_data) { |
| 1071 | *next_hash = ~0; |
| 1072 | return count; |
| 1073 | } |
| 1074 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1075 | count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo, |
| 1076 | start_hash, start_minor_hash); |
| 1077 | *next_hash = ~0; |
| 1078 | return count; |
| 1079 | } |
| 1080 | hinfo.hash = start_hash; |
| 1081 | hinfo.minor_hash = 0; |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 1082 | frame = dx_probe(NULL, dir, &hinfo, frames); |
| 1083 | if (IS_ERR(frame)) |
| 1084 | return PTR_ERR(frame); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1085 | |
| 1086 | /* Add '.' and '..' from the htree header */ |
| 1087 | if (!start_hash && !start_minor_hash) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1088 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
Theodore Ts'o | 2f61830 | 2015-04-12 00:56:26 -0400 | [diff] [blame] | 1089 | tmp_str.name = de->name; |
| 1090 | tmp_str.len = de->name_len; |
| 1091 | err = ext4_htree_store_dirent(dir_file, 0, 0, |
| 1092 | de, &tmp_str); |
| 1093 | if (err != 0) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1094 | goto errout; |
| 1095 | count++; |
| 1096 | } |
| 1097 | if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1098 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1099 | de = ext4_next_entry(de, dir->i_sb->s_blocksize); |
Theodore Ts'o | 2f61830 | 2015-04-12 00:56:26 -0400 | [diff] [blame] | 1100 | tmp_str.name = de->name; |
| 1101 | tmp_str.len = de->name_len; |
| 1102 | err = ext4_htree_store_dirent(dir_file, 2, 0, |
| 1103 | de, &tmp_str); |
| 1104 | if (err != 0) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1105 | goto errout; |
| 1106 | count++; |
| 1107 | } |
| 1108 | |
| 1109 | while (1) { |
| 1110 | block = dx_get_block(frame->at); |
| 1111 | ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo, |
| 1112 | start_hash, start_minor_hash); |
| 1113 | if (ret < 0) { |
| 1114 | err = ret; |
| 1115 | goto errout; |
| 1116 | } |
| 1117 | count += ret; |
| 1118 | hashval = ~0; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1119 | ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1120 | frame, frames, &hashval); |
| 1121 | *next_hash = hashval; |
| 1122 | if (ret < 0) { |
| 1123 | err = ret; |
| 1124 | goto errout; |
| 1125 | } |
| 1126 | /* |
| 1127 | * Stop if: (a) there are no more entries, or |
| 1128 | * (b) we have inserted at least one entry and the |
| 1129 | * next hash value is not a continuation |
| 1130 | */ |
| 1131 | if ((ret == 0) || |
| 1132 | (count && ((hashval & 1) == 0))) |
| 1133 | break; |
| 1134 | } |
| 1135 | dx_release(frames); |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 1136 | dxtrace(printk(KERN_DEBUG "Fill tree: returned %d entries, " |
| 1137 | "next hash: %x\n", count, *next_hash)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1138 | return count; |
| 1139 | errout: |
| 1140 | dx_release(frames); |
| 1141 | return (err); |
| 1142 | } |
| 1143 | |
Tao Ma | 7335cd3 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 1144 | static inline int search_dirblock(struct buffer_head *bh, |
| 1145 | struct inode *dir, |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1146 | struct ext4_filename *fname, |
Tao Ma | 7335cd3 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 1147 | const struct qstr *d_name, |
| 1148 | unsigned int offset, |
| 1149 | struct ext4_dir_entry_2 **res_dir) |
| 1150 | { |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1151 | return ext4_search_dir(bh, bh->b_data, dir->i_sb->s_blocksize, dir, |
| 1152 | fname, d_name, offset, res_dir); |
Tao Ma | 7335cd3 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 1153 | } |
| 1154 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1155 | /* |
| 1156 | * Directory block splitting, compacting |
| 1157 | */ |
| 1158 | |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 1159 | /* |
| 1160 | * Create map of hash values, offsets, and sizes, stored at end of block. |
| 1161 | * Returns number of entries mapped. |
| 1162 | */ |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1163 | static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de, |
| 1164 | unsigned blocksize, struct dx_hash_info *hinfo, |
Theodore Ts'o | 8bad459 | 2009-02-14 21:46:54 -0500 | [diff] [blame] | 1165 | struct dx_map_entry *map_tail) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1166 | { |
| 1167 | int count = 0; |
| 1168 | char *base = (char *) de; |
| 1169 | struct dx_hash_info h = *hinfo; |
| 1170 | |
Theodore Ts'o | 8bad459 | 2009-02-14 21:46:54 -0500 | [diff] [blame] | 1171 | while ((char *) de < base + blocksize) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1172 | if (de->name_len && de->inode) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1173 | ext4fs_dirhash(de->name, de->name_len, &h); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1174 | map_tail--; |
| 1175 | map_tail->hash = h.hash; |
Toshiyuki Okajima | 9aee228 | 2009-06-08 12:41:35 -0400 | [diff] [blame] | 1176 | map_tail->offs = ((char *) de - base)>>2; |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 1177 | map_tail->size = le16_to_cpu(de->rec_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1178 | count++; |
| 1179 | cond_resched(); |
| 1180 | } |
| 1181 | /* XXX: do we need to check rec_len == 0 case? -Chris */ |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1182 | de = ext4_next_entry(de, blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1183 | } |
| 1184 | return count; |
| 1185 | } |
| 1186 | |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 1187 | /* Sort map by hash value */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1188 | static void dx_sort_map (struct dx_map_entry *map, unsigned count) |
| 1189 | { |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 1190 | struct dx_map_entry *p, *q, *top = map + count - 1; |
| 1191 | int more; |
| 1192 | /* Combsort until bubble sort doesn't suck */ |
| 1193 | while (count > 2) { |
| 1194 | count = count*10/13; |
| 1195 | if (count - 9 < 2) /* 9, 10 -> 11 */ |
| 1196 | count = 11; |
| 1197 | for (p = top, q = p - count; q >= map; p--, q--) |
| 1198 | if (p->hash < q->hash) |
| 1199 | swap(*p, *q); |
| 1200 | } |
| 1201 | /* Garden variety bubble sort */ |
| 1202 | do { |
| 1203 | more = 0; |
| 1204 | q = top; |
| 1205 | while (q-- > map) { |
| 1206 | if (q[1].hash >= q[0].hash) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1207 | continue; |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 1208 | swap(*(q+1), *q); |
| 1209 | more = 1; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1210 | } |
| 1211 | } while(more); |
| 1212 | } |
| 1213 | |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1214 | static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1215 | { |
| 1216 | struct dx_entry *entries = frame->entries; |
| 1217 | struct dx_entry *old = frame->at, *new = old + 1; |
| 1218 | int count = dx_get_count(entries); |
| 1219 | |
| 1220 | assert(count < dx_get_limit(entries)); |
| 1221 | assert(old < entries + count); |
| 1222 | memmove(new + 1, new, (char *)(entries + count) - (char *)(new)); |
| 1223 | dx_set_hash(new, hash); |
| 1224 | dx_set_block(new, block); |
| 1225 | dx_set_count(entries, count + 1); |
| 1226 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1227 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1228 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1229 | * NOTE! unlike strncmp, ext4_match returns 1 for success, 0 for failure. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1230 | * |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1231 | * `len <= EXT4_NAME_LEN' is guaranteed by caller. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1232 | * `de != NULL' is guaranteed by caller. |
| 1233 | */ |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1234 | static inline int ext4_match(struct ext4_filename *fname, |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1235 | struct ext4_dir_entry_2 *de) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1236 | { |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1237 | const void *name = fname_name(fname); |
| 1238 | u32 len = fname_len(fname); |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1239 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1240 | if (!de->inode) |
| 1241 | return 0; |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1242 | |
| 1243 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1244 | if (unlikely(!name)) { |
| 1245 | if (fname->usr_fname->name[0] == '_') { |
| 1246 | int ret; |
| 1247 | if (de->name_len < 16) |
| 1248 | return 0; |
| 1249 | ret = memcmp(de->name + de->name_len - 16, |
| 1250 | fname->crypto_buf.name + 8, 16); |
| 1251 | return (ret == 0) ? 1 : 0; |
| 1252 | } |
| 1253 | name = fname->crypto_buf.name; |
| 1254 | len = fname->crypto_buf.len; |
| 1255 | } |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1256 | #endif |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1257 | if (de->name_len != len) |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1258 | return 0; |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1259 | return (memcmp(de->name, name, len) == 0) ? 1 : 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1260 | } |
| 1261 | |
| 1262 | /* |
| 1263 | * Returns 0 if not found, -1 on failure, and 1 on success |
| 1264 | */ |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1265 | int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size, |
| 1266 | struct inode *dir, struct ext4_filename *fname, |
| 1267 | const struct qstr *d_name, |
| 1268 | unsigned int offset, struct ext4_dir_entry_2 **res_dir) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1269 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1270 | struct ext4_dir_entry_2 * de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1271 | char * dlimit; |
| 1272 | int de_len; |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1273 | int res; |
| 1274 | |
Tao Ma | 7335cd3 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 1275 | de = (struct ext4_dir_entry_2 *)search_buf; |
| 1276 | dlimit = search_buf + buf_size; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1277 | while ((char *) de < dlimit) { |
| 1278 | /* this code is executed quadratically often */ |
| 1279 | /* do minimal checking `by hand' */ |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1280 | if ((char *) de + de->name_len <= dlimit) { |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1281 | res = ext4_match(fname, de); |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1282 | if (res < 0) { |
| 1283 | res = -1; |
| 1284 | goto return_result; |
| 1285 | } |
| 1286 | if (res > 0) { |
| 1287 | /* found a match - just to be sure, do |
| 1288 | * a full check */ |
| 1289 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
| 1290 | bh->b_data, |
| 1291 | bh->b_size, offset)) { |
| 1292 | res = -1; |
| 1293 | goto return_result; |
| 1294 | } |
| 1295 | *res_dir = de; |
| 1296 | res = 1; |
| 1297 | goto return_result; |
| 1298 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1299 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1300 | } |
| 1301 | /* prevent looping on a bad block */ |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1302 | de_len = ext4_rec_len_from_disk(de->rec_len, |
| 1303 | dir->i_sb->s_blocksize); |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1304 | if (de_len <= 0) { |
| 1305 | res = -1; |
| 1306 | goto return_result; |
| 1307 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1308 | offset += de_len; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1309 | de = (struct ext4_dir_entry_2 *) ((char *) de + de_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1310 | } |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1311 | |
| 1312 | res = 0; |
| 1313 | return_result: |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1314 | return res; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1315 | } |
| 1316 | |
Darrick J. Wong | c6af880 | 2012-11-12 23:51:02 -0500 | [diff] [blame] | 1317 | static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block, |
| 1318 | struct ext4_dir_entry *de) |
| 1319 | { |
| 1320 | struct super_block *sb = dir->i_sb; |
| 1321 | |
| 1322 | if (!is_dx(dir)) |
| 1323 | return 0; |
| 1324 | if (block == 0) |
| 1325 | return 1; |
| 1326 | if (de->inode == 0 && |
| 1327 | ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) == |
| 1328 | sb->s_blocksize) |
| 1329 | return 1; |
| 1330 | return 0; |
| 1331 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1332 | |
| 1333 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1334 | * ext4_find_entry() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1335 | * |
| 1336 | * finds an entry in the specified directory with the wanted name. It |
| 1337 | * returns the cache buffer in which the entry was found, and the entry |
| 1338 | * itself (as a parameter - res_dir). It does NOT read the inode of the |
| 1339 | * entry - you'll have to do that yourself if you want to. |
| 1340 | * |
| 1341 | * The returned buffer_head has ->b_count elevated. The caller is expected |
| 1342 | * to brelse() it when appropriate. |
| 1343 | */ |
Theodore Ts'o | f702ba0 | 2008-09-22 15:21:01 -0400 | [diff] [blame] | 1344 | static struct buffer_head * ext4_find_entry (struct inode *dir, |
| 1345 | const struct qstr *d_name, |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 1346 | struct ext4_dir_entry_2 **res_dir, |
| 1347 | int *inlined) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1348 | { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1349 | struct super_block *sb; |
| 1350 | struct buffer_head *bh_use[NAMEI_RA_SIZE]; |
| 1351 | struct buffer_head *bh, *ret = NULL; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1352 | ext4_lblk_t start, block, b; |
Theodore Ts'o | 8941ec8 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1353 | const u8 *name = d_name->name; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1354 | int ra_max = 0; /* Number of bh's in the readahead |
| 1355 | buffer, bh_use[] */ |
| 1356 | int ra_ptr = 0; /* Current index into readahead |
| 1357 | buffer */ |
| 1358 | int num = 0; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1359 | ext4_lblk_t nblocks; |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1360 | int i, namelen, retval; |
| 1361 | struct ext4_filename fname; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1362 | |
| 1363 | *res_dir = NULL; |
| 1364 | sb = dir->i_sb; |
Theodore Ts'o | f702ba0 | 2008-09-22 15:21:01 -0400 | [diff] [blame] | 1365 | namelen = d_name->len; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1366 | if (namelen > EXT4_NAME_LEN) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1367 | return NULL; |
Tao Ma | e8e948e | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 1368 | |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1369 | retval = ext4_fname_setup_filename(dir, d_name, 1, &fname); |
| 1370 | if (retval) |
| 1371 | return ERR_PTR(retval); |
| 1372 | |
Tao Ma | e8e948e | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 1373 | if (ext4_has_inline_data(dir)) { |
| 1374 | int has_inline_data = 1; |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1375 | ret = ext4_find_inline_entry(dir, &fname, d_name, res_dir, |
Tao Ma | e8e948e | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 1376 | &has_inline_data); |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 1377 | if (has_inline_data) { |
| 1378 | if (inlined) |
| 1379 | *inlined = 1; |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1380 | goto cleanup_and_exit; |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 1381 | } |
Tao Ma | e8e948e | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 1382 | } |
| 1383 | |
Theodore Ts'o | 8941ec8 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1384 | if ((namelen <= 2) && (name[0] == '.') && |
Aaro Koskinen | 6d5c3aa | 2010-12-14 21:45:31 -0500 | [diff] [blame] | 1385 | (name[1] == '.' || name[1] == '\0')) { |
Theodore Ts'o | 8941ec8 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1386 | /* |
| 1387 | * "." or ".." will only be in the first block |
| 1388 | * NFS may look up ".."; "." should be handled by the VFS |
| 1389 | */ |
| 1390 | block = start = 0; |
| 1391 | nblocks = 1; |
| 1392 | goto restart; |
| 1393 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1394 | if (is_dx(dir)) { |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1395 | ret = ext4_dx_find_entry(dir, &fname, res_dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1396 | /* |
| 1397 | * On success, or if the error was file not found, |
| 1398 | * return. Otherwise, fall back to doing a search the |
| 1399 | * old fashioned way. |
| 1400 | */ |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1401 | if (!IS_ERR(ret) || PTR_ERR(ret) != ERR_BAD_DX_DIR) |
| 1402 | goto cleanup_and_exit; |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 1403 | dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, " |
| 1404 | "falling back\n")); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1405 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1406 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
| 1407 | start = EXT4_I(dir)->i_dir_start_lookup; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1408 | if (start >= nblocks) |
| 1409 | start = 0; |
| 1410 | block = start; |
| 1411 | restart: |
| 1412 | do { |
| 1413 | /* |
| 1414 | * We deal with the read-ahead logic here. |
| 1415 | */ |
| 1416 | if (ra_ptr >= ra_max) { |
| 1417 | /* Refill the readahead buffer */ |
| 1418 | ra_ptr = 0; |
| 1419 | b = block; |
| 1420 | for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) { |
| 1421 | /* |
| 1422 | * Terminate if we reach the end of the |
| 1423 | * directory and must wrap, or if our |
| 1424 | * search has finished at this block. |
| 1425 | */ |
| 1426 | if (b >= nblocks || (num && block == start)) { |
| 1427 | bh_use[ra_max] = NULL; |
| 1428 | break; |
| 1429 | } |
| 1430 | num++; |
Theodore Ts'o | 1056008 | 2014-08-29 20:51:32 -0400 | [diff] [blame] | 1431 | bh = ext4_getblk(NULL, dir, b++, 0); |
Viresh Kumar | a1c8368 | 2015-08-12 15:59:44 +0530 | [diff] [blame^] | 1432 | if (IS_ERR(bh)) { |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1433 | if (ra_max == 0) { |
| 1434 | ret = bh; |
| 1435 | goto cleanup_and_exit; |
| 1436 | } |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 1437 | break; |
| 1438 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1439 | bh_use[ra_max] = bh; |
| 1440 | if (bh) |
Christoph Hellwig | 65299a3 | 2011-08-23 14:50:29 +0200 | [diff] [blame] | 1441 | ll_rw_block(READ | REQ_META | REQ_PRIO, |
| 1442 | 1, &bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1443 | } |
| 1444 | } |
| 1445 | if ((bh = bh_use[ra_ptr++]) == NULL) |
| 1446 | goto next; |
| 1447 | wait_on_buffer(bh); |
| 1448 | if (!buffer_uptodate(bh)) { |
| 1449 | /* read error, skip block & hope for the best */ |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 1450 | EXT4_ERROR_INODE(dir, "reading directory lblock %lu", |
| 1451 | (unsigned long) block); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1452 | brelse(bh); |
| 1453 | goto next; |
| 1454 | } |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1455 | if (!buffer_verified(bh) && |
Darrick J. Wong | c6af880 | 2012-11-12 23:51:02 -0500 | [diff] [blame] | 1456 | !is_dx_internal_node(dir, block, |
| 1457 | (struct ext4_dir_entry *)bh->b_data) && |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1458 | !ext4_dirent_csum_verify(dir, |
| 1459 | (struct ext4_dir_entry *)bh->b_data)) { |
| 1460 | EXT4_ERROR_INODE(dir, "checksumming directory " |
| 1461 | "block %lu", (unsigned long)block); |
| 1462 | brelse(bh); |
| 1463 | goto next; |
| 1464 | } |
| 1465 | set_buffer_verified(bh); |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1466 | i = search_dirblock(bh, dir, &fname, d_name, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1467 | block << EXT4_BLOCK_SIZE_BITS(sb), res_dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1468 | if (i == 1) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1469 | EXT4_I(dir)->i_dir_start_lookup = block; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1470 | ret = bh; |
| 1471 | goto cleanup_and_exit; |
| 1472 | } else { |
| 1473 | brelse(bh); |
| 1474 | if (i < 0) |
| 1475 | goto cleanup_and_exit; |
| 1476 | } |
| 1477 | next: |
| 1478 | if (++block >= nblocks) |
| 1479 | block = 0; |
| 1480 | } while (block != start); |
| 1481 | |
| 1482 | /* |
| 1483 | * If the directory has grown while we were searching, then |
| 1484 | * search the last part of the directory before giving up. |
| 1485 | */ |
| 1486 | block = nblocks; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1487 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1488 | if (block < nblocks) { |
| 1489 | start = 0; |
| 1490 | goto restart; |
| 1491 | } |
| 1492 | |
| 1493 | cleanup_and_exit: |
| 1494 | /* Clean up the read-ahead blocks */ |
| 1495 | for (; ra_ptr < ra_max; ra_ptr++) |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1496 | brelse(bh_use[ra_ptr]); |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1497 | ext4_fname_free_filename(&fname); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1498 | return ret; |
| 1499 | } |
| 1500 | |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1501 | static struct buffer_head * ext4_dx_find_entry(struct inode *dir, |
| 1502 | struct ext4_filename *fname, |
| 1503 | struct ext4_dir_entry_2 **res_dir) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1504 | { |
Theodore Ts'o | 8941ec8 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1505 | struct super_block * sb = dir->i_sb; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1506 | struct dx_frame frames[2], *frame; |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1507 | const struct qstr *d_name = fname->usr_fname; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1508 | struct buffer_head *bh; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1509 | ext4_lblk_t block; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1510 | int retval; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1511 | |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1512 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
| 1513 | *res_dir = NULL; |
| 1514 | #endif |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1515 | frame = dx_probe(fname, dir, NULL, frames); |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 1516 | if (IS_ERR(frame)) |
| 1517 | return (struct buffer_head *) frame; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1518 | do { |
| 1519 | block = dx_get_block(frame->at); |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 1520 | bh = ext4_read_dirblock(dir, block, DIRENT); |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame] | 1521 | if (IS_ERR(bh)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1522 | goto errout; |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame] | 1523 | |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1524 | retval = search_dirblock(bh, dir, fname, d_name, |
Theodore Ts'o | 7845c04 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1525 | block << EXT4_BLOCK_SIZE_BITS(sb), |
| 1526 | res_dir); |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame] | 1527 | if (retval == 1) |
| 1528 | goto success; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1529 | brelse(bh); |
Theodore Ts'o | 7845c04 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1530 | if (retval == -1) { |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame] | 1531 | bh = ERR_PTR(ERR_BAD_DX_DIR); |
Theodore Ts'o | 7845c04 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1532 | goto errout; |
| 1533 | } |
| 1534 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1535 | /* Check to see if we should continue to search */ |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1536 | retval = ext4_htree_next_block(dir, fname->hinfo.hash, frame, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1537 | frames, NULL); |
| 1538 | if (retval < 0) { |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 1539 | ext4_warning_inode(dir, |
| 1540 | "error %d reading directory index block", |
| 1541 | retval); |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame] | 1542 | bh = ERR_PTR(retval); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1543 | goto errout; |
| 1544 | } |
| 1545 | } while (retval == 1); |
| 1546 | |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame] | 1547 | bh = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1548 | errout: |
Bernd Schubert | 265c6a0 | 2011-07-16 19:41:23 -0400 | [diff] [blame] | 1549 | dxtrace(printk(KERN_DEBUG "%s not found\n", d_name->name)); |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame] | 1550 | success: |
| 1551 | dx_release(frames); |
| 1552 | return bh; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1553 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1554 | |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 1555 | static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1556 | { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1557 | struct inode *inode; |
| 1558 | struct ext4_dir_entry_2 *de; |
| 1559 | struct buffer_head *bh; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1560 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1561 | if (dentry->d_name.len > EXT4_NAME_LEN) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1562 | return ERR_PTR(-ENAMETOOLONG); |
| 1563 | |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 1564 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 1565 | if (IS_ERR(bh)) |
| 1566 | return (struct dentry *) bh; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1567 | inode = NULL; |
| 1568 | if (bh) { |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 1569 | __u32 ino = le32_to_cpu(de->inode); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1570 | brelse(bh); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1571 | if (!ext4_valid_inum(dir->i_sb, ino)) { |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 1572 | EXT4_ERROR_INODE(dir, "bad inode number: %u", ino); |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1573 | return ERR_PTR(-EIO); |
Vasily Averin | a6c15c2 | 2007-07-15 23:40:46 -0700 | [diff] [blame] | 1574 | } |
Andreas Dilger | 7e936b7 | 2012-05-28 17:02:25 -0400 | [diff] [blame] | 1575 | if (unlikely(ino == dir->i_ino)) { |
David Howells | a34e15c | 2014-01-06 14:04:23 -0500 | [diff] [blame] | 1576 | EXT4_ERROR_INODE(dir, "'%pd' linked to parent dir", |
| 1577 | dentry); |
Andreas Dilger | 7e936b7 | 2012-05-28 17:02:25 -0400 | [diff] [blame] | 1578 | return ERR_PTR(-EIO); |
| 1579 | } |
Theodore Ts'o | f4bb298 | 2014-10-05 22:56:00 -0400 | [diff] [blame] | 1580 | inode = ext4_iget_normal(dir->i_sb, ino); |
Al Viro | a904937 | 2011-07-08 21:20:11 -0400 | [diff] [blame] | 1581 | if (inode == ERR_PTR(-ESTALE)) { |
| 1582 | EXT4_ERROR_INODE(dir, |
| 1583 | "deleted inode referenced: %u", |
| 1584 | ino); |
| 1585 | return ERR_PTR(-EIO); |
Bryan Donlan | e6f009b | 2009-02-22 21:20:25 -0500 | [diff] [blame] | 1586 | } |
Theodore Ts'o | d9cdc903 | 2015-04-12 00:55:08 -0400 | [diff] [blame] | 1587 | if (!IS_ERR(inode) && ext4_encrypted_inode(dir) && |
| 1588 | (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
| 1589 | S_ISLNK(inode->i_mode)) && |
| 1590 | !ext4_is_child_context_consistent_with_parent(dir, |
| 1591 | inode)) { |
| 1592 | iput(inode); |
| 1593 | ext4_warning(inode->i_sb, |
| 1594 | "Inconsistent encryption contexts: %lu/%lu\n", |
| 1595 | (unsigned long) dir->i_ino, |
| 1596 | (unsigned long) inode->i_ino); |
| 1597 | return ERR_PTR(-EPERM); |
| 1598 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1599 | } |
| 1600 | return d_splice_alias(inode, dentry); |
| 1601 | } |
| 1602 | |
| 1603 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1604 | struct dentry *ext4_get_parent(struct dentry *child) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1605 | { |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 1606 | __u32 ino; |
Linus Torvalds | 26fe575 | 2012-05-10 13:14:12 -0700 | [diff] [blame] | 1607 | static const struct qstr dotdot = QSTR_INIT("..", 2); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1608 | struct ext4_dir_entry_2 * de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1609 | struct buffer_head *bh; |
| 1610 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1611 | bh = ext4_find_entry(d_inode(child), &dotdot, &de, NULL); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 1612 | if (IS_ERR(bh)) |
| 1613 | return (struct dentry *) bh; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1614 | if (!bh) |
| 1615 | return ERR_PTR(-ENOENT); |
| 1616 | ino = le32_to_cpu(de->inode); |
| 1617 | brelse(bh); |
| 1618 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1619 | if (!ext4_valid_inum(d_inode(child)->i_sb, ino)) { |
| 1620 | EXT4_ERROR_INODE(d_inode(child), |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 1621 | "bad parent inode number: %u", ino); |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1622 | return ERR_PTR(-EIO); |
Vasily Averin | a6c15c2 | 2007-07-15 23:40:46 -0700 | [diff] [blame] | 1623 | } |
| 1624 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1625 | return d_obtain_alias(ext4_iget_normal(d_inode(child)->i_sb, ino)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1626 | } |
| 1627 | |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 1628 | /* |
| 1629 | * Move count entries from end of map between two memory locations. |
| 1630 | * Returns pointer to last entry moved. |
| 1631 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1632 | static struct ext4_dir_entry_2 * |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1633 | dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count, |
| 1634 | unsigned blocksize) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1635 | { |
| 1636 | unsigned rec_len = 0; |
| 1637 | |
| 1638 | while (count--) { |
Theodore Ts'o | 60e6679 | 2010-05-17 07:00:00 -0400 | [diff] [blame] | 1639 | struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *) |
Toshiyuki Okajima | 9aee228 | 2009-06-08 12:41:35 -0400 | [diff] [blame] | 1640 | (from + (map->offs<<2)); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1641 | rec_len = EXT4_DIR_REC_LEN(de->name_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1642 | memcpy (to, de, rec_len); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1643 | ((struct ext4_dir_entry_2 *) to)->rec_len = |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1644 | ext4_rec_len_to_disk(rec_len, blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1645 | de->inode = 0; |
| 1646 | map++; |
| 1647 | to += rec_len; |
| 1648 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1649 | return (struct ext4_dir_entry_2 *) (to - rec_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1650 | } |
| 1651 | |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 1652 | /* |
| 1653 | * Compact each dir entry in the range to the minimal rec_len. |
| 1654 | * Returns pointer to last entry in range. |
| 1655 | */ |
Theodore Ts'o | 8bad459 | 2009-02-14 21:46:54 -0500 | [diff] [blame] | 1656 | static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1657 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1658 | struct ext4_dir_entry_2 *next, *to, *prev, *de = (struct ext4_dir_entry_2 *) base; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1659 | unsigned rec_len = 0; |
| 1660 | |
| 1661 | prev = to = de; |
Theodore Ts'o | 8bad459 | 2009-02-14 21:46:54 -0500 | [diff] [blame] | 1662 | while ((char*)de < base + blocksize) { |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1663 | next = ext4_next_entry(de, blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1664 | if (de->inode && de->name_len) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1665 | rec_len = EXT4_DIR_REC_LEN(de->name_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1666 | if (de > to) |
| 1667 | memmove(to, de, rec_len); |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1668 | to->rec_len = ext4_rec_len_to_disk(rec_len, blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1669 | prev = to; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1670 | to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1671 | } |
| 1672 | de = next; |
| 1673 | } |
| 1674 | return prev; |
| 1675 | } |
| 1676 | |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 1677 | /* |
| 1678 | * Split a full leaf block to make room for a new dir entry. |
| 1679 | * Allocate a new block, and move entries so that they are approx. equally full. |
| 1680 | * Returns pointer to de in block into which the new entry will be inserted. |
| 1681 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1682 | static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1683 | struct buffer_head **bh,struct dx_frame *frame, |
Theodore Ts'o | f8b3b59 | 2014-08-29 20:52:18 -0400 | [diff] [blame] | 1684 | struct dx_hash_info *hinfo) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1685 | { |
| 1686 | unsigned blocksize = dir->i_sb->s_blocksize; |
| 1687 | unsigned count, continued; |
| 1688 | struct buffer_head *bh2; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1689 | ext4_lblk_t newblock; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1690 | u32 hash2; |
| 1691 | struct dx_map_entry *map; |
| 1692 | char *data1 = (*bh)->b_data, *data2; |
Theodore Ts'o | 59e315b | 2008-12-06 16:58:39 -0500 | [diff] [blame] | 1693 | unsigned split, move, size; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1694 | struct ext4_dir_entry_2 *de = NULL, *de2; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1695 | struct ext4_dir_entry_tail *t; |
| 1696 | int csum_size = 0; |
Theodore Ts'o | 59e315b | 2008-12-06 16:58:39 -0500 | [diff] [blame] | 1697 | int err = 0, i; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1698 | |
Dmitry Monakhov | 9aa5d32 | 2014-10-13 03:36:16 -0400 | [diff] [blame] | 1699 | if (ext4_has_metadata_csum(dir->i_sb)) |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1700 | csum_size = sizeof(struct ext4_dir_entry_tail); |
| 1701 | |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 1702 | bh2 = ext4_append(handle, dir, &newblock); |
| 1703 | if (IS_ERR(bh2)) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1704 | brelse(*bh); |
| 1705 | *bh = NULL; |
Theodore Ts'o | f8b3b59 | 2014-08-29 20:52:18 -0400 | [diff] [blame] | 1706 | return (struct ext4_dir_entry_2 *) bh2; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1707 | } |
| 1708 | |
| 1709 | BUFFER_TRACE(*bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1710 | err = ext4_journal_get_write_access(handle, *bh); |
Dmitriy Monakhov | fedee54 | 2007-05-08 00:25:34 -0700 | [diff] [blame] | 1711 | if (err) |
| 1712 | goto journal_error; |
| 1713 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1714 | BUFFER_TRACE(frame->bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1715 | err = ext4_journal_get_write_access(handle, frame->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1716 | if (err) |
| 1717 | goto journal_error; |
| 1718 | |
| 1719 | data2 = bh2->b_data; |
| 1720 | |
| 1721 | /* create map in the end of data2 block */ |
| 1722 | map = (struct dx_map_entry *) (data2 + blocksize); |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1723 | count = dx_make_map(dir, (struct ext4_dir_entry_2 *) data1, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1724 | blocksize, hinfo, map); |
| 1725 | map -= count; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1726 | dx_sort_map(map, count); |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 1727 | /* Split the existing block in the middle, size-wise */ |
| 1728 | size = 0; |
| 1729 | move = 0; |
| 1730 | for (i = count-1; i >= 0; i--) { |
| 1731 | /* is more than half of this entry in 2nd half of the block? */ |
| 1732 | if (size + map[i].size/2 > blocksize/2) |
| 1733 | break; |
| 1734 | size += map[i].size; |
| 1735 | move++; |
| 1736 | } |
| 1737 | /* map index at which we will split */ |
| 1738 | split = count - move; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1739 | hash2 = map[split].hash; |
| 1740 | continued = hash2 == map[split - 1].hash; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1741 | dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n", |
| 1742 | (unsigned long)dx_get_block(frame->at), |
| 1743 | hash2, split, count-split)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1744 | |
| 1745 | /* Fancy dance to stay within two buffers */ |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1746 | de2 = dx_move_dirents(data1, data2, map + split, count - split, |
| 1747 | blocksize); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1748 | de = dx_pack_dirents(data1, blocksize); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1749 | de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) - |
| 1750 | (char *) de, |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1751 | blocksize); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1752 | de2->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) - |
| 1753 | (char *) de2, |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1754 | blocksize); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1755 | if (csum_size) { |
| 1756 | t = EXT4_DIRENT_TAIL(data2, blocksize); |
| 1757 | initialize_dirent_tail(t, blocksize); |
| 1758 | |
| 1759 | t = EXT4_DIRENT_TAIL(data1, blocksize); |
| 1760 | initialize_dirent_tail(t, blocksize); |
| 1761 | } |
| 1762 | |
Michael Halcrow | b309848 | 2015-04-12 01:07:01 -0400 | [diff] [blame] | 1763 | dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data1, |
| 1764 | blocksize, 1)); |
| 1765 | dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data2, |
| 1766 | blocksize, 1)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1767 | |
| 1768 | /* Which block gets the new entry? */ |
Theodore Ts'o | f8b3b59 | 2014-08-29 20:52:18 -0400 | [diff] [blame] | 1769 | if (hinfo->hash >= hash2) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1770 | swap(*bh, bh2); |
| 1771 | de = de2; |
| 1772 | } |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1773 | dx_insert_block(frame, hash2 + continued, newblock); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1774 | err = ext4_handle_dirty_dirent_node(handle, dir, bh2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1775 | if (err) |
| 1776 | goto journal_error; |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 1777 | err = ext4_handle_dirty_dx_node(handle, dir, frame->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1778 | if (err) |
| 1779 | goto journal_error; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1780 | brelse(bh2); |
| 1781 | dxtrace(dx_show_index("frame", frame->entries)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1782 | return de; |
Dmitriy Monakhov | fedee54 | 2007-05-08 00:25:34 -0700 | [diff] [blame] | 1783 | |
| 1784 | journal_error: |
| 1785 | brelse(*bh); |
| 1786 | brelse(bh2); |
| 1787 | *bh = NULL; |
| 1788 | ext4_std_error(dir->i_sb, err); |
Theodore Ts'o | f8b3b59 | 2014-08-29 20:52:18 -0400 | [diff] [blame] | 1789 | return ERR_PTR(err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1790 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1791 | |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1792 | int ext4_find_dest_de(struct inode *dir, struct inode *inode, |
| 1793 | struct buffer_head *bh, |
| 1794 | void *buf, int buf_size, |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1795 | struct ext4_filename *fname, |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1796 | struct ext4_dir_entry_2 **dest_de) |
| 1797 | { |
| 1798 | struct ext4_dir_entry_2 *de; |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1799 | unsigned short reclen = EXT4_DIR_REC_LEN(fname_len(fname)); |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1800 | int nlen, rlen; |
| 1801 | unsigned int offset = 0; |
| 1802 | char *top; |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1803 | int res; |
| 1804 | |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1805 | de = (struct ext4_dir_entry_2 *)buf; |
| 1806 | top = buf + buf_size - reclen; |
| 1807 | while ((char *) de <= top) { |
| 1808 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1809 | buf, buf_size, offset)) { |
| 1810 | res = -EIO; |
| 1811 | goto return_result; |
| 1812 | } |
| 1813 | /* Provide crypto context and crypto buffer to ext4 match */ |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1814 | res = ext4_match(fname, de); |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1815 | if (res < 0) |
| 1816 | goto return_result; |
| 1817 | if (res > 0) { |
| 1818 | res = -EEXIST; |
| 1819 | goto return_result; |
| 1820 | } |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1821 | nlen = EXT4_DIR_REC_LEN(de->name_len); |
| 1822 | rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); |
| 1823 | if ((de->inode ? rlen - nlen : rlen) >= reclen) |
| 1824 | break; |
| 1825 | de = (struct ext4_dir_entry_2 *)((char *)de + rlen); |
| 1826 | offset += rlen; |
| 1827 | } |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1828 | |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1829 | if ((char *) de > top) |
| 1830 | res = -ENOSPC; |
| 1831 | else { |
| 1832 | *dest_de = de; |
| 1833 | res = 0; |
| 1834 | } |
| 1835 | return_result: |
Michael Halcrow | 1f3862b | 2015-04-12 01:09:03 -0400 | [diff] [blame] | 1836 | return res; |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1837 | } |
| 1838 | |
Michael Halcrow | 4bdfc87 | 2015-04-12 00:56:28 -0400 | [diff] [blame] | 1839 | int ext4_insert_dentry(struct inode *dir, |
| 1840 | struct inode *inode, |
| 1841 | struct ext4_dir_entry_2 *de, |
| 1842 | int buf_size, |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1843 | struct ext4_filename *fname) |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1844 | { |
| 1845 | |
| 1846 | int nlen, rlen; |
| 1847 | |
| 1848 | nlen = EXT4_DIR_REC_LEN(de->name_len); |
| 1849 | rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); |
| 1850 | if (de->inode) { |
| 1851 | struct ext4_dir_entry_2 *de1 = |
Michael Halcrow | 4bdfc87 | 2015-04-12 00:56:28 -0400 | [diff] [blame] | 1852 | (struct ext4_dir_entry_2 *)((char *)de + nlen); |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1853 | de1->rec_len = ext4_rec_len_to_disk(rlen - nlen, buf_size); |
| 1854 | de->rec_len = ext4_rec_len_to_disk(nlen, buf_size); |
| 1855 | de = de1; |
| 1856 | } |
| 1857 | de->file_type = EXT4_FT_UNKNOWN; |
| 1858 | de->inode = cpu_to_le32(inode->i_ino); |
| 1859 | ext4_set_de_type(inode->i_sb, de, inode->i_mode); |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1860 | de->name_len = fname_len(fname); |
| 1861 | memcpy(de->name, fname_name(fname), fname_len(fname)); |
Michael Halcrow | 4bdfc87 | 2015-04-12 00:56:28 -0400 | [diff] [blame] | 1862 | return 0; |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1863 | } |
Michael Halcrow | 4bdfc87 | 2015-04-12 00:56:28 -0400 | [diff] [blame] | 1864 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1865 | /* |
| 1866 | * Add a new entry into a directory (leaf) block. If de is non-NULL, |
| 1867 | * it points to a directory entry which is guaranteed to be large |
| 1868 | * enough for new directory entry. If de is NULL, then |
| 1869 | * add_dirent_to_buf will attempt search the directory block for |
| 1870 | * space. It will return -ENOSPC if no space is available, and -EIO |
| 1871 | * and -EEXIST if directory entry already exists. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1872 | */ |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1873 | static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname, |
| 1874 | struct inode *dir, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1875 | struct inode *inode, struct ext4_dir_entry_2 *de, |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1876 | struct buffer_head *bh) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1877 | { |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1878 | unsigned int blocksize = dir->i_sb->s_blocksize; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1879 | int csum_size = 0; |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1880 | int err; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1881 | |
Dmitry Monakhov | 9aa5d32 | 2014-10-13 03:36:16 -0400 | [diff] [blame] | 1882 | if (ext4_has_metadata_csum(inode->i_sb)) |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1883 | csum_size = sizeof(struct ext4_dir_entry_tail); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1884 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1885 | if (!de) { |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1886 | err = ext4_find_dest_de(dir, inode, bh, bh->b_data, |
| 1887 | blocksize - csum_size, fname, &de); |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1888 | if (err) |
| 1889 | return err; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1890 | } |
| 1891 | BUFFER_TRACE(bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1892 | err = ext4_journal_get_write_access(handle, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1893 | if (err) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1894 | ext4_std_error(dir->i_sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1895 | return err; |
| 1896 | } |
| 1897 | |
Michael Halcrow | 4bdfc87 | 2015-04-12 00:56:28 -0400 | [diff] [blame] | 1898 | /* By now the buffer is marked for journaling. Due to crypto operations, |
| 1899 | * the following function call may fail */ |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1900 | err = ext4_insert_dentry(dir, inode, de, blocksize, fname); |
Michael Halcrow | 4bdfc87 | 2015-04-12 00:56:28 -0400 | [diff] [blame] | 1901 | if (err < 0) |
| 1902 | return err; |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1903 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1904 | /* |
| 1905 | * XXX shouldn't update any times until successful |
| 1906 | * completion of syscall, but too many callers depend |
| 1907 | * on this. |
| 1908 | * |
| 1909 | * XXX similarly, too many callers depend on |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1910 | * ext4_new_inode() setting the times, but error |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1911 | * recovery deletes the inode, so the worst that can |
| 1912 | * happen is that the times are slightly out of date |
| 1913 | * and/or different from the directory change time. |
| 1914 | */ |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 1915 | dir->i_mtime = dir->i_ctime = ext4_current_time(dir); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1916 | ext4_update_dx_flag(dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1917 | dir->i_version++; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1918 | ext4_mark_inode_dirty(handle, dir); |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 1919 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1920 | err = ext4_handle_dirty_dirent_node(handle, dir, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1921 | if (err) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1922 | ext4_std_error(dir->i_sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1923 | return 0; |
| 1924 | } |
| 1925 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1926 | /* |
| 1927 | * This converts a one block unindexed directory to a 3 block indexed |
| 1928 | * directory, and adds the dentry to the indexed directory. |
| 1929 | */ |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 1930 | static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname, |
| 1931 | struct dentry *dentry, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1932 | struct inode *inode, struct buffer_head *bh) |
| 1933 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1934 | struct inode *dir = d_inode(dentry->d_parent); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1935 | struct buffer_head *bh2; |
| 1936 | struct dx_root *root; |
| 1937 | struct dx_frame frames[2], *frame; |
| 1938 | struct dx_entry *entries; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1939 | struct ext4_dir_entry_2 *de, *de2; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1940 | struct ext4_dir_entry_tail *t; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1941 | char *data1, *top; |
| 1942 | unsigned len; |
| 1943 | int retval; |
| 1944 | unsigned blocksize; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1945 | ext4_lblk_t block; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1946 | struct fake_dirent *fde; |
Michael Halcrow | 4bdfc87 | 2015-04-12 00:56:28 -0400 | [diff] [blame] | 1947 | int csum_size = 0; |
| 1948 | |
Dmitry Monakhov | 9aa5d32 | 2014-10-13 03:36:16 -0400 | [diff] [blame] | 1949 | if (ext4_has_metadata_csum(inode->i_sb)) |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1950 | csum_size = sizeof(struct ext4_dir_entry_tail); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1951 | |
| 1952 | blocksize = dir->i_sb->s_blocksize; |
Theodore Ts'o | e6b8bc0 | 2009-01-16 11:13:40 -0500 | [diff] [blame] | 1953 | dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino)); |
liang xie | 5d60125 | 2014-05-12 22:06:43 -0400 | [diff] [blame] | 1954 | BUFFER_TRACE(bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1955 | retval = ext4_journal_get_write_access(handle, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1956 | if (retval) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1957 | ext4_std_error(dir->i_sb, retval); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1958 | brelse(bh); |
| 1959 | return retval; |
| 1960 | } |
| 1961 | root = (struct dx_root *) bh->b_data; |
| 1962 | |
Theodore Ts'o | e6b8bc0 | 2009-01-16 11:13:40 -0500 | [diff] [blame] | 1963 | /* The 0th block becomes the root, move the dirents out */ |
| 1964 | fde = &root->dotdot; |
| 1965 | de = (struct ext4_dir_entry_2 *)((char *)fde + |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1966 | ext4_rec_len_from_disk(fde->rec_len, blocksize)); |
Theodore Ts'o | e6b8bc0 | 2009-01-16 11:13:40 -0500 | [diff] [blame] | 1967 | if ((char *) de >= (((char *) root) + blocksize)) { |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 1968 | EXT4_ERROR_INODE(dir, "invalid rec_len for '..'"); |
Theodore Ts'o | e6b8bc0 | 2009-01-16 11:13:40 -0500 | [diff] [blame] | 1969 | brelse(bh); |
| 1970 | return -EIO; |
| 1971 | } |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1972 | len = ((char *) root) + (blocksize - csum_size) - (char *) de; |
Theodore Ts'o | e6b8bc0 | 2009-01-16 11:13:40 -0500 | [diff] [blame] | 1973 | |
| 1974 | /* Allocate new block for the 0th block's dirents */ |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 1975 | bh2 = ext4_append(handle, dir, &block); |
| 1976 | if (IS_ERR(bh2)) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1977 | brelse(bh); |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 1978 | return PTR_ERR(bh2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1979 | } |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 1980 | ext4_set_inode_flag(dir, EXT4_INODE_INDEX); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1981 | data1 = bh2->b_data; |
| 1982 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1983 | memcpy (data1, de, len); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1984 | de = (struct ext4_dir_entry_2 *) data1; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1985 | top = data1 + len; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1986 | while ((char *)(de2 = ext4_next_entry(de, blocksize)) < top) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1987 | de = de2; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1988 | de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) - |
| 1989 | (char *) de, |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1990 | blocksize); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1991 | |
| 1992 | if (csum_size) { |
| 1993 | t = EXT4_DIRENT_TAIL(data1, blocksize); |
| 1994 | initialize_dirent_tail(t, blocksize); |
| 1995 | } |
| 1996 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1997 | /* Initialize the root; the dot dirents already exist */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1998 | de = (struct ext4_dir_entry_2 *) (&root->dotdot); |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1999 | de->rec_len = ext4_rec_len_to_disk(blocksize - EXT4_DIR_REC_LEN(2), |
| 2000 | blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2001 | memset (&root->info, 0, sizeof(root->info)); |
| 2002 | root->info.info_length = sizeof(root->info); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2003 | root->info.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2004 | entries = root->entries; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2005 | dx_set_block(entries, 1); |
| 2006 | dx_set_count(entries, 1); |
| 2007 | dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info))); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2008 | |
| 2009 | /* Initialize as for dx_probe */ |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2010 | fname->hinfo.hash_version = root->info.hash_version; |
| 2011 | if (fname->hinfo.hash_version <= DX_HASH_TEA) |
| 2012 | fname->hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; |
| 2013 | fname->hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
| 2014 | ext4fs_dirhash(fname_name(fname), fname_len(fname), &fname->hinfo); |
| 2015 | |
Jan Kara | 6050d47 | 2014-10-30 10:53:17 -0400 | [diff] [blame] | 2016 | memset(frames, 0, sizeof(frames)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2017 | frame = frames; |
| 2018 | frame->entries = entries; |
| 2019 | frame->at = entries; |
| 2020 | frame->bh = bh; |
| 2021 | bh = bh2; |
Allison Henderson | 6976a6f | 2011-05-15 00:19:41 -0400 | [diff] [blame] | 2022 | |
Jan Kara | 6050d47 | 2014-10-30 10:53:17 -0400 | [diff] [blame] | 2023 | retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh); |
| 2024 | if (retval) |
| 2025 | goto out_frames; |
| 2026 | retval = ext4_handle_dirty_dirent_node(handle, dir, bh); |
| 2027 | if (retval) |
| 2028 | goto out_frames; |
Allison Henderson | 6976a6f | 2011-05-15 00:19:41 -0400 | [diff] [blame] | 2029 | |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2030 | de = do_split(handle,dir, &bh, frame, &fname->hinfo); |
Theodore Ts'o | f8b3b59 | 2014-08-29 20:52:18 -0400 | [diff] [blame] | 2031 | if (IS_ERR(de)) { |
Jan Kara | 6050d47 | 2014-10-30 10:53:17 -0400 | [diff] [blame] | 2032 | retval = PTR_ERR(de); |
| 2033 | goto out_frames; |
Jan Kara | 7ad8e4e | 2011-05-03 11:05:55 -0400 | [diff] [blame] | 2034 | } |
| 2035 | dx_release(frames); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2036 | |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2037 | retval = add_dirent_to_buf(handle, fname, dir, inode, de, bh); |
Theodore Ts'o | 2de770a | 2009-11-23 07:25:49 -0500 | [diff] [blame] | 2038 | brelse(bh); |
| 2039 | return retval; |
Jan Kara | 6050d47 | 2014-10-30 10:53:17 -0400 | [diff] [blame] | 2040 | out_frames: |
| 2041 | /* |
| 2042 | * Even if the block split failed, we have to properly write |
| 2043 | * out all the changes we did so far. Otherwise we can end up |
| 2044 | * with corrupted filesystem. |
| 2045 | */ |
| 2046 | ext4_mark_inode_dirty(handle, dir); |
| 2047 | dx_release(frames); |
| 2048 | return retval; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2049 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2050 | |
| 2051 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2052 | * ext4_add_entry() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2053 | * |
| 2054 | * adds a file entry to the specified directory, using the same |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2055 | * semantics as ext4_find_entry(). It returns NULL if it failed. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2056 | * |
| 2057 | * NOTE!! The inode part of 'de' is left at 0 - which means you |
| 2058 | * may not sleep between calling this and putting something into |
| 2059 | * the entry, as someone else might have used it while you slept. |
| 2060 | */ |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2061 | static int ext4_add_entry(handle_t *handle, struct dentry *dentry, |
| 2062 | struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2063 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 2064 | struct inode *dir = d_inode(dentry->d_parent); |
Lukas Czerner | e12fb97 | 2015-04-03 10:46:58 -0400 | [diff] [blame] | 2065 | struct buffer_head *bh = NULL; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2066 | struct ext4_dir_entry_2 *de; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 2067 | struct ext4_dir_entry_tail *t; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2068 | struct super_block *sb; |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2069 | struct ext4_filename fname; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2070 | int retval; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2071 | int dx_fallback=0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2072 | unsigned blocksize; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2073 | ext4_lblk_t block, blocks; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 2074 | int csum_size = 0; |
| 2075 | |
Dmitry Monakhov | 9aa5d32 | 2014-10-13 03:36:16 -0400 | [diff] [blame] | 2076 | if (ext4_has_metadata_csum(inode->i_sb)) |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 2077 | csum_size = sizeof(struct ext4_dir_entry_tail); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2078 | |
| 2079 | sb = dir->i_sb; |
| 2080 | blocksize = sb->s_blocksize; |
| 2081 | if (!dentry->d_name.len) |
| 2082 | return -EINVAL; |
Tao Ma | 3c47d54 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 2083 | |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2084 | retval = ext4_fname_setup_filename(dir, &dentry->d_name, 0, &fname); |
| 2085 | if (retval) |
| 2086 | return retval; |
| 2087 | |
Tao Ma | 3c47d54 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 2088 | if (ext4_has_inline_data(dir)) { |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2089 | retval = ext4_try_add_inline_entry(handle, &fname, |
| 2090 | dentry, inode); |
Tao Ma | 3c47d54 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 2091 | if (retval < 0) |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2092 | goto out; |
Tao Ma | 3c47d54 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 2093 | if (retval == 1) { |
| 2094 | retval = 0; |
Lukas Czerner | e12fb97 | 2015-04-03 10:46:58 -0400 | [diff] [blame] | 2095 | goto out; |
Tao Ma | 3c47d54 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 2096 | } |
| 2097 | } |
| 2098 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2099 | if (is_dx(dir)) { |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2100 | retval = ext4_dx_add_entry(handle, &fname, dentry, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2101 | if (!retval || (retval != ERR_BAD_DX_DIR)) |
Lukas Czerner | e12fb97 | 2015-04-03 10:46:58 -0400 | [diff] [blame] | 2102 | goto out; |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 2103 | ext4_clear_inode_flag(dir, EXT4_INODE_INDEX); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2104 | dx_fallback++; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2105 | ext4_mark_inode_dirty(handle, dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2106 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2107 | blocks = dir->i_size >> sb->s_blocksize_bits; |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 2108 | for (block = 0; block < blocks; block++) { |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 2109 | bh = ext4_read_dirblock(dir, block, DIRENT); |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2110 | if (IS_ERR(bh)) { |
| 2111 | retval = PTR_ERR(bh); |
| 2112 | bh = NULL; |
| 2113 | goto out; |
| 2114 | } |
| 2115 | retval = add_dirent_to_buf(handle, &fname, dir, inode, |
| 2116 | NULL, bh); |
Lukas Czerner | e12fb97 | 2015-04-03 10:46:58 -0400 | [diff] [blame] | 2117 | if (retval != -ENOSPC) |
| 2118 | goto out; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2119 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2120 | if (blocks == 1 && !dx_fallback && |
Lukas Czerner | e12fb97 | 2015-04-03 10:46:58 -0400 | [diff] [blame] | 2121 | EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) { |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2122 | retval = make_indexed_dir(handle, &fname, dentry, |
| 2123 | inode, bh); |
Lukas Czerner | e12fb97 | 2015-04-03 10:46:58 -0400 | [diff] [blame] | 2124 | bh = NULL; /* make_indexed_dir releases bh */ |
| 2125 | goto out; |
| 2126 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2127 | brelse(bh); |
| 2128 | } |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 2129 | bh = ext4_append(handle, dir, &block); |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2130 | if (IS_ERR(bh)) { |
| 2131 | retval = PTR_ERR(bh); |
| 2132 | bh = NULL; |
| 2133 | goto out; |
| 2134 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2135 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2136 | de->inode = 0; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 2137 | de->rec_len = ext4_rec_len_to_disk(blocksize - csum_size, blocksize); |
| 2138 | |
| 2139 | if (csum_size) { |
| 2140 | t = EXT4_DIRENT_TAIL(bh->b_data, blocksize); |
| 2141 | initialize_dirent_tail(t, blocksize); |
| 2142 | } |
| 2143 | |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2144 | retval = add_dirent_to_buf(handle, &fname, dir, inode, de, bh); |
Lukas Czerner | e12fb97 | 2015-04-03 10:46:58 -0400 | [diff] [blame] | 2145 | out: |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2146 | ext4_fname_free_filename(&fname); |
Theodore Ts'o | 2de770a | 2009-11-23 07:25:49 -0500 | [diff] [blame] | 2147 | brelse(bh); |
Frank Mayhar | 14ece10 | 2010-05-17 08:00:00 -0400 | [diff] [blame] | 2148 | if (retval == 0) |
| 2149 | ext4_set_inode_state(inode, EXT4_STATE_NEWENTRY); |
Theodore Ts'o | 2de770a | 2009-11-23 07:25:49 -0500 | [diff] [blame] | 2150 | return retval; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2151 | } |
| 2152 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2153 | /* |
| 2154 | * Returns 0 for success, or a negative error value |
| 2155 | */ |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2156 | static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, |
| 2157 | struct dentry *dentry, struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2158 | { |
| 2159 | struct dx_frame frames[2], *frame; |
| 2160 | struct dx_entry *entries, *at; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2161 | struct buffer_head *bh; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 2162 | struct inode *dir = d_inode(dentry->d_parent); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2163 | struct super_block *sb = dir->i_sb; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2164 | struct ext4_dir_entry_2 *de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2165 | int err; |
| 2166 | |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2167 | frame = dx_probe(fname, dir, NULL, frames); |
Theodore Ts'o | dd73b5d | 2014-08-29 20:52:17 -0400 | [diff] [blame] | 2168 | if (IS_ERR(frame)) |
| 2169 | return PTR_ERR(frame); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2170 | entries = frame->entries; |
| 2171 | at = frame->at; |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 2172 | bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT); |
| 2173 | if (IS_ERR(bh)) { |
| 2174 | err = PTR_ERR(bh); |
| 2175 | bh = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2176 | goto cleanup; |
Carlos Maiolino | 6d1ab10 | 2012-09-27 09:31:33 -0400 | [diff] [blame] | 2177 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2178 | |
| 2179 | BUFFER_TRACE(bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2180 | err = ext4_journal_get_write_access(handle, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2181 | if (err) |
| 2182 | goto journal_error; |
| 2183 | |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2184 | err = add_dirent_to_buf(handle, fname, dir, inode, NULL, bh); |
Theodore Ts'o | 2de770a | 2009-11-23 07:25:49 -0500 | [diff] [blame] | 2185 | if (err != -ENOSPC) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2186 | goto cleanup; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2187 | |
| 2188 | /* Block full, should compress but for now just split */ |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 2189 | dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2190 | dx_get_count(entries), dx_get_limit(entries))); |
| 2191 | /* Need to split index? */ |
| 2192 | if (dx_get_count(entries) == dx_get_limit(entries)) { |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2193 | ext4_lblk_t newblock; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2194 | unsigned icount = dx_get_count(entries); |
| 2195 | int levels = frame - frames; |
| 2196 | struct dx_entry *entries2; |
| 2197 | struct dx_node *node2; |
| 2198 | struct buffer_head *bh2; |
| 2199 | |
| 2200 | if (levels && (dx_get_count(frames->entries) == |
| 2201 | dx_get_limit(frames->entries))) { |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 2202 | ext4_warning_inode(dir, "Directory index full!"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2203 | err = -ENOSPC; |
| 2204 | goto cleanup; |
| 2205 | } |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 2206 | bh2 = ext4_append(handle, dir, &newblock); |
| 2207 | if (IS_ERR(bh2)) { |
| 2208 | err = PTR_ERR(bh2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2209 | goto cleanup; |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 2210 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2211 | node2 = (struct dx_node *)(bh2->b_data); |
| 2212 | entries2 = node2->entries; |
Andreas Schlick | 1f7bebb | 2009-09-10 23:16:07 -0400 | [diff] [blame] | 2213 | memset(&node2->fake, 0, sizeof(struct fake_dirent)); |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2214 | node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize, |
| 2215 | sb->s_blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2216 | BUFFER_TRACE(frame->bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2217 | err = ext4_journal_get_write_access(handle, frame->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2218 | if (err) |
| 2219 | goto journal_error; |
| 2220 | if (levels) { |
| 2221 | unsigned icount1 = icount/2, icount2 = icount - icount1; |
| 2222 | unsigned hash2 = dx_get_hash(entries + icount1); |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 2223 | dxtrace(printk(KERN_DEBUG "Split index %i/%i\n", |
| 2224 | icount1, icount2)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2225 | |
| 2226 | BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2227 | err = ext4_journal_get_write_access(handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2228 | frames[0].bh); |
| 2229 | if (err) |
| 2230 | goto journal_error; |
| 2231 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2232 | memcpy((char *) entries2, (char *) (entries + icount1), |
| 2233 | icount2 * sizeof(struct dx_entry)); |
| 2234 | dx_set_count(entries, icount1); |
| 2235 | dx_set_count(entries2, icount2); |
| 2236 | dx_set_limit(entries2, dx_node_limit(dir)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2237 | |
| 2238 | /* Which index block gets the new entry? */ |
| 2239 | if (at - entries >= icount1) { |
| 2240 | frame->at = at = at - entries - icount1 + entries2; |
| 2241 | frame->entries = entries = entries2; |
| 2242 | swap(frame->bh, bh2); |
| 2243 | } |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2244 | dx_insert_block(frames + 0, hash2, newblock); |
| 2245 | dxtrace(dx_show_index("node", frames[1].entries)); |
| 2246 | dxtrace(dx_show_index("node", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2247 | ((struct dx_node *) bh2->b_data)->entries)); |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 2248 | err = ext4_handle_dirty_dx_node(handle, dir, bh2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2249 | if (err) |
| 2250 | goto journal_error; |
| 2251 | brelse (bh2); |
| 2252 | } else { |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 2253 | dxtrace(printk(KERN_DEBUG |
| 2254 | "Creating second level index...\n")); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2255 | memcpy((char *) entries2, (char *) entries, |
| 2256 | icount * sizeof(struct dx_entry)); |
| 2257 | dx_set_limit(entries2, dx_node_limit(dir)); |
| 2258 | |
| 2259 | /* Set up root */ |
| 2260 | dx_set_count(entries, 1); |
| 2261 | dx_set_block(entries + 0, newblock); |
| 2262 | ((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels = 1; |
| 2263 | |
| 2264 | /* Add new access path frame */ |
| 2265 | frame = frames + 1; |
| 2266 | frame->at = at = at - entries + entries2; |
| 2267 | frame->entries = entries = entries2; |
| 2268 | frame->bh = bh2; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2269 | err = ext4_journal_get_write_access(handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2270 | frame->bh); |
| 2271 | if (err) |
| 2272 | goto journal_error; |
| 2273 | } |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 2274 | err = ext4_handle_dirty_dx_node(handle, dir, frames[0].bh); |
Theodore Ts'o | b409714 | 2011-01-10 12:46:59 -0500 | [diff] [blame] | 2275 | if (err) { |
| 2276 | ext4_std_error(inode->i_sb, err); |
| 2277 | goto cleanup; |
| 2278 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2279 | } |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2280 | de = do_split(handle, dir, &bh, frame, &fname->hinfo); |
Theodore Ts'o | f8b3b59 | 2014-08-29 20:52:18 -0400 | [diff] [blame] | 2281 | if (IS_ERR(de)) { |
| 2282 | err = PTR_ERR(de); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2283 | goto cleanup; |
Theodore Ts'o | f8b3b59 | 2014-08-29 20:52:18 -0400 | [diff] [blame] | 2284 | } |
Theodore Ts'o | 5b643f9 | 2015-05-18 13:14:47 -0400 | [diff] [blame] | 2285 | err = add_dirent_to_buf(handle, fname, dir, inode, de, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2286 | goto cleanup; |
| 2287 | |
| 2288 | journal_error: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2289 | ext4_std_error(dir->i_sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2290 | cleanup: |
Guo Chao | b1deefc | 2013-01-28 21:41:02 -0500 | [diff] [blame] | 2291 | brelse(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2292 | dx_release(frames); |
| 2293 | return err; |
| 2294 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2295 | |
| 2296 | /* |
Tao Ma | 05019a9 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2297 | * ext4_generic_delete_entry deletes a directory entry by merging it |
| 2298 | * with the previous entry |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2299 | */ |
Tao Ma | 05019a9 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2300 | int ext4_generic_delete_entry(handle_t *handle, |
| 2301 | struct inode *dir, |
| 2302 | struct ext4_dir_entry_2 *de_del, |
| 2303 | struct buffer_head *bh, |
| 2304 | void *entry_buf, |
| 2305 | int buf_size, |
| 2306 | int csum_size) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2307 | { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2308 | struct ext4_dir_entry_2 *de, *pde; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2309 | unsigned int blocksize = dir->i_sb->s_blocksize; |
Tao Ma | 05019a9 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2310 | int i; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 2311 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2312 | i = 0; |
| 2313 | pde = NULL; |
Tao Ma | 05019a9 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2314 | de = (struct ext4_dir_entry_2 *)entry_buf; |
| 2315 | while (i < buf_size - csum_size) { |
Tao Ma | 226ba97 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 2316 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
| 2317 | bh->b_data, bh->b_size, i)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2318 | return -EIO; |
| 2319 | if (de == de_del) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2320 | if (pde) |
Jan Kara | a72d7f8 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2321 | pde->rec_len = ext4_rec_len_to_disk( |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2322 | ext4_rec_len_from_disk(pde->rec_len, |
| 2323 | blocksize) + |
| 2324 | ext4_rec_len_from_disk(de->rec_len, |
| 2325 | blocksize), |
| 2326 | blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2327 | else |
| 2328 | de->inode = 0; |
| 2329 | dir->i_version++; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2330 | return 0; |
| 2331 | } |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2332 | i += ext4_rec_len_from_disk(de->rec_len, blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2333 | pde = de; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2334 | de = ext4_next_entry(de, blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2335 | } |
| 2336 | return -ENOENT; |
| 2337 | } |
| 2338 | |
Tao Ma | 05019a9 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2339 | static int ext4_delete_entry(handle_t *handle, |
| 2340 | struct inode *dir, |
| 2341 | struct ext4_dir_entry_2 *de_del, |
| 2342 | struct buffer_head *bh) |
| 2343 | { |
| 2344 | int err, csum_size = 0; |
| 2345 | |
Tao Ma | 9f40fe5 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2346 | if (ext4_has_inline_data(dir)) { |
| 2347 | int has_inline_data = 1; |
| 2348 | err = ext4_delete_inline_entry(handle, dir, de_del, bh, |
| 2349 | &has_inline_data); |
| 2350 | if (has_inline_data) |
| 2351 | return err; |
| 2352 | } |
| 2353 | |
Dmitry Monakhov | 9aa5d32 | 2014-10-13 03:36:16 -0400 | [diff] [blame] | 2354 | if (ext4_has_metadata_csum(dir->i_sb)) |
Tao Ma | 05019a9 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2355 | csum_size = sizeof(struct ext4_dir_entry_tail); |
| 2356 | |
| 2357 | BUFFER_TRACE(bh, "get_write_access"); |
| 2358 | err = ext4_journal_get_write_access(handle, bh); |
| 2359 | if (unlikely(err)) |
| 2360 | goto out; |
| 2361 | |
| 2362 | err = ext4_generic_delete_entry(handle, dir, de_del, |
| 2363 | bh, bh->b_data, |
| 2364 | dir->i_sb->s_blocksize, csum_size); |
| 2365 | if (err) |
| 2366 | goto out; |
| 2367 | |
| 2368 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
| 2369 | err = ext4_handle_dirty_dirent_node(handle, dir, bh); |
| 2370 | if (unlikely(err)) |
| 2371 | goto out; |
| 2372 | |
| 2373 | return 0; |
| 2374 | out: |
| 2375 | if (err != -ENOENT) |
| 2376 | ext4_std_error(dir->i_sb, err); |
| 2377 | return err; |
| 2378 | } |
| 2379 | |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2380 | /* |
| 2381 | * DIR_NLINK feature is set if 1) nlinks > EXT4_LINK_MAX or 2) nlinks == 2, |
| 2382 | * since this indicates that nlinks count was previously 1. |
| 2383 | */ |
| 2384 | static void ext4_inc_count(handle_t *handle, struct inode *inode) |
| 2385 | { |
| 2386 | inc_nlink(inode); |
| 2387 | if (is_dx(inode) && inode->i_nlink > 1) { |
| 2388 | /* limit is 16-bit i_links_count */ |
| 2389 | if (inode->i_nlink >= EXT4_LINK_MAX || inode->i_nlink == 2) { |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 2390 | set_nlink(inode, 1); |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2391 | EXT4_SET_RO_COMPAT_FEATURE(inode->i_sb, |
| 2392 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK); |
| 2393 | } |
| 2394 | } |
| 2395 | } |
| 2396 | |
| 2397 | /* |
| 2398 | * If a directory had nlink == 1, then we should let it be 1. This indicates |
| 2399 | * directory has >EXT4_LINK_MAX subdirs. |
| 2400 | */ |
| 2401 | static void ext4_dec_count(handle_t *handle, struct inode *inode) |
| 2402 | { |
Andreas Dilger | 909a4cf | 2011-10-26 03:22:31 -0400 | [diff] [blame] | 2403 | if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) |
| 2404 | drop_nlink(inode); |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2405 | } |
| 2406 | |
| 2407 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2408 | static int ext4_add_nondir(handle_t *handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2409 | struct dentry *dentry, struct inode *inode) |
| 2410 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2411 | int err = ext4_add_entry(handle, dentry, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2412 | if (!err) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2413 | ext4_mark_inode_dirty(handle, inode); |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 2414 | unlock_new_inode(inode); |
Al Viro | 8fc37ec | 2012-07-19 09:18:15 +0400 | [diff] [blame] | 2415 | d_instantiate(dentry, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2416 | return 0; |
| 2417 | } |
Eric Sandeen | 731b9a5 | 2007-02-10 01:46:16 -0800 | [diff] [blame] | 2418 | drop_nlink(inode); |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 2419 | unlock_new_inode(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2420 | iput(inode); |
| 2421 | return err; |
| 2422 | } |
| 2423 | |
| 2424 | /* |
| 2425 | * By the time this is called, we already have created |
| 2426 | * the directory cache entry for the new file, but it |
| 2427 | * is so far negative - it has no inode. |
| 2428 | * |
| 2429 | * If the create succeeds, we fill in the inode information |
| 2430 | * with d_instantiate(). |
| 2431 | */ |
Al Viro | 4acdaf2 | 2011-07-26 01:42:34 -0400 | [diff] [blame] | 2432 | static int ext4_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 2433 | bool excl) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2434 | { |
| 2435 | handle_t *handle; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2436 | struct inode *inode; |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2437 | int err, credits, retries = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2438 | |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 2439 | dquot_initialize(dir); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 2440 | |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2441 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
Jan Kara | eb9cc7e | 2013-04-19 13:38:14 -0400 | [diff] [blame] | 2442 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2443 | retry: |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2444 | inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0, |
| 2445 | NULL, EXT4_HT_DIR, credits); |
| 2446 | handle = ext4_journal_current_handle(); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2447 | err = PTR_ERR(inode); |
| 2448 | if (!IS_ERR(inode)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2449 | inode->i_op = &ext4_file_inode_operations; |
Boaz Harrosh | be64f88 | 2015-04-15 16:15:17 -0700 | [diff] [blame] | 2450 | inode->i_fop = &ext4_file_operations; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2451 | ext4_set_aops(inode); |
Theodore Ts'o | e709e9d | 2015-05-31 13:35:02 -0400 | [diff] [blame] | 2452 | err = ext4_add_nondir(handle, dentry, inode); |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2453 | if (!err && IS_DIRSYNC(dir)) |
| 2454 | ext4_handle_sync(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2455 | } |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2456 | if (handle) |
| 2457 | ext4_journal_stop(handle); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2458 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2459 | goto retry; |
| 2460 | return err; |
| 2461 | } |
| 2462 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2463 | static int ext4_mknod(struct inode *dir, struct dentry *dentry, |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 2464 | umode_t mode, dev_t rdev) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2465 | { |
| 2466 | handle_t *handle; |
| 2467 | struct inode *inode; |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2468 | int err, credits, retries = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2469 | |
| 2470 | if (!new_valid_dev(rdev)) |
| 2471 | return -EINVAL; |
| 2472 | |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 2473 | dquot_initialize(dir); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 2474 | |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2475 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
Jan Kara | eb9cc7e | 2013-04-19 13:38:14 -0400 | [diff] [blame] | 2476 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2477 | retry: |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2478 | inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0, |
| 2479 | NULL, EXT4_HT_DIR, credits); |
| 2480 | handle = ext4_journal_current_handle(); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2481 | err = PTR_ERR(inode); |
| 2482 | if (!IS_ERR(inode)) { |
| 2483 | init_special_inode(inode, inode->i_mode, rdev); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2484 | inode->i_op = &ext4_special_inode_operations; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2485 | err = ext4_add_nondir(handle, dentry, inode); |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2486 | if (!err && IS_DIRSYNC(dir)) |
| 2487 | ext4_handle_sync(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2488 | } |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2489 | if (handle) |
| 2490 | ext4_journal_stop(handle); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2491 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2492 | goto retry; |
| 2493 | return err; |
| 2494 | } |
| 2495 | |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2496 | static int ext4_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
| 2497 | { |
| 2498 | handle_t *handle; |
| 2499 | struct inode *inode; |
| 2500 | int err, retries = 0; |
| 2501 | |
| 2502 | dquot_initialize(dir); |
| 2503 | |
| 2504 | retry: |
| 2505 | inode = ext4_new_inode_start_handle(dir, mode, |
| 2506 | NULL, 0, NULL, |
| 2507 | EXT4_HT_DIR, |
| 2508 | EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) + |
| 2509 | 4 + EXT4_XATTR_TRANS_BLOCKS); |
| 2510 | handle = ext4_journal_current_handle(); |
| 2511 | err = PTR_ERR(inode); |
| 2512 | if (!IS_ERR(inode)) { |
| 2513 | inode->i_op = &ext4_file_inode_operations; |
Boaz Harrosh | be64f88 | 2015-04-15 16:15:17 -0700 | [diff] [blame] | 2514 | inode->i_fop = &ext4_file_operations; |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2515 | ext4_set_aops(inode); |
Zheng Liu | e94bd34 | 2013-07-20 21:58:38 -0400 | [diff] [blame] | 2516 | d_tmpfile(dentry, inode); |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2517 | err = ext4_orphan_add(handle, inode); |
| 2518 | if (err) |
Miklos Szeredi | 43ae9e3 | 2013-10-10 16:48:19 +0200 | [diff] [blame] | 2519 | goto err_unlock_inode; |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2520 | mark_inode_dirty(inode); |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2521 | unlock_new_inode(inode); |
| 2522 | } |
| 2523 | if (handle) |
| 2524 | ext4_journal_stop(handle); |
| 2525 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
| 2526 | goto retry; |
| 2527 | return err; |
Miklos Szeredi | 43ae9e3 | 2013-10-10 16:48:19 +0200 | [diff] [blame] | 2528 | err_unlock_inode: |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2529 | ext4_journal_stop(handle); |
| 2530 | unlock_new_inode(inode); |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2531 | return err; |
| 2532 | } |
| 2533 | |
Tao Ma | a774f9c | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2534 | struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, |
| 2535 | struct ext4_dir_entry_2 *de, |
| 2536 | int blocksize, int csum_size, |
| 2537 | unsigned int parent_ino, int dotdot_real_len) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2538 | { |
Tao Ma | a774f9c | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2539 | de->inode = cpu_to_le32(inode->i_ino); |
| 2540 | de->name_len = 1; |
| 2541 | de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len), |
| 2542 | blocksize); |
| 2543 | strcpy(de->name, "."); |
| 2544 | ext4_set_de_type(inode->i_sb, de, S_IFDIR); |
| 2545 | |
| 2546 | de = ext4_next_entry(de, blocksize); |
| 2547 | de->inode = cpu_to_le32(parent_ino); |
| 2548 | de->name_len = 2; |
| 2549 | if (!dotdot_real_len) |
| 2550 | de->rec_len = ext4_rec_len_to_disk(blocksize - |
| 2551 | (csum_size + EXT4_DIR_REC_LEN(1)), |
| 2552 | blocksize); |
| 2553 | else |
| 2554 | de->rec_len = ext4_rec_len_to_disk( |
| 2555 | EXT4_DIR_REC_LEN(de->name_len), blocksize); |
| 2556 | strcpy(de->name, ".."); |
| 2557 | ext4_set_de_type(inode->i_sb, de, S_IFDIR); |
| 2558 | |
| 2559 | return ext4_next_entry(de, blocksize); |
| 2560 | } |
| 2561 | |
| 2562 | static int ext4_init_new_dir(handle_t *handle, struct inode *dir, |
| 2563 | struct inode *inode) |
| 2564 | { |
Namhyung Kim | dabd991 | 2011-01-10 12:11:16 -0500 | [diff] [blame] | 2565 | struct buffer_head *dir_block = NULL; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2566 | struct ext4_dir_entry_2 *de; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 2567 | struct ext4_dir_entry_tail *t; |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 2568 | ext4_lblk_t block = 0; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2569 | unsigned int blocksize = dir->i_sb->s_blocksize; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 2570 | int csum_size = 0; |
Tao Ma | a774f9c | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2571 | int err; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2572 | |
Dmitry Monakhov | 9aa5d32 | 2014-10-13 03:36:16 -0400 | [diff] [blame] | 2573 | if (ext4_has_metadata_csum(dir->i_sb)) |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 2574 | csum_size = sizeof(struct ext4_dir_entry_tail); |
| 2575 | |
Tao Ma | 3c47d54 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 2576 | if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) { |
| 2577 | err = ext4_try_create_inline_dir(handle, dir, inode); |
| 2578 | if (err < 0 && err != -ENOSPC) |
| 2579 | goto out; |
| 2580 | if (!err) |
| 2581 | goto out; |
| 2582 | } |
| 2583 | |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 2584 | inode->i_size = 0; |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 2585 | dir_block = ext4_append(handle, inode, &block); |
| 2586 | if (IS_ERR(dir_block)) |
| 2587 | return PTR_ERR(dir_block); |
Tao Ma | a774f9c | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2588 | de = (struct ext4_dir_entry_2 *)dir_block->b_data; |
| 2589 | ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0); |
| 2590 | set_nlink(inode, 2); |
| 2591 | if (csum_size) { |
| 2592 | t = EXT4_DIRENT_TAIL(dir_block->b_data, blocksize); |
| 2593 | initialize_dirent_tail(t, blocksize); |
| 2594 | } |
| 2595 | |
| 2596 | BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata"); |
| 2597 | err = ext4_handle_dirty_dirent_node(handle, inode, dir_block); |
| 2598 | if (err) |
| 2599 | goto out; |
| 2600 | set_buffer_verified(dir_block); |
| 2601 | out: |
| 2602 | brelse(dir_block); |
| 2603 | return err; |
| 2604 | } |
| 2605 | |
| 2606 | static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
| 2607 | { |
| 2608 | handle_t *handle; |
| 2609 | struct inode *inode; |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2610 | int err, credits, retries = 0; |
Tao Ma | a774f9c | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2611 | |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2612 | if (EXT4_DIR_LINK_MAX(dir)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2613 | return -EMLINK; |
| 2614 | |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 2615 | dquot_initialize(dir); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 2616 | |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2617 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
Jan Kara | eb9cc7e | 2013-04-19 13:38:14 -0400 | [diff] [blame] | 2618 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2619 | retry: |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2620 | inode = ext4_new_inode_start_handle(dir, S_IFDIR | mode, |
| 2621 | &dentry->d_name, |
| 2622 | 0, NULL, EXT4_HT_DIR, credits); |
| 2623 | handle = ext4_journal_current_handle(); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2624 | err = PTR_ERR(inode); |
| 2625 | if (IS_ERR(inode)) |
| 2626 | goto out_stop; |
| 2627 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2628 | inode->i_op = &ext4_dir_inode_operations; |
| 2629 | inode->i_fop = &ext4_dir_operations; |
Tao Ma | a774f9c | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2630 | err = ext4_init_new_dir(handle, dir, inode); |
Namhyung Kim | dabd991 | 2011-01-10 12:11:16 -0500 | [diff] [blame] | 2631 | if (err) |
| 2632 | goto out_clear_inode; |
Namhyung Kim | dabd991 | 2011-01-10 12:11:16 -0500 | [diff] [blame] | 2633 | err = ext4_mark_inode_dirty(handle, inode); |
| 2634 | if (!err) |
| 2635 | err = ext4_add_entry(handle, dentry, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2636 | if (err) { |
Aneesh Kumar K.V | 4cdeed8 | 2008-02-22 06:17:31 -0500 | [diff] [blame] | 2637 | out_clear_inode: |
| 2638 | clear_nlink(inode); |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 2639 | unlock_new_inode(inode); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2640 | ext4_mark_inode_dirty(handle, inode); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2641 | iput(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2642 | goto out_stop; |
| 2643 | } |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2644 | ext4_inc_count(handle, dir); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2645 | ext4_update_dx_flag(dir); |
Namhyung Kim | dabd991 | 2011-01-10 12:11:16 -0500 | [diff] [blame] | 2646 | err = ext4_mark_inode_dirty(handle, dir); |
| 2647 | if (err) |
| 2648 | goto out_clear_inode; |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 2649 | unlock_new_inode(inode); |
Al Viro | 8fc37ec | 2012-07-19 09:18:15 +0400 | [diff] [blame] | 2650 | d_instantiate(dentry, inode); |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2651 | if (IS_DIRSYNC(dir)) |
| 2652 | ext4_handle_sync(handle); |
| 2653 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2654 | out_stop: |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2655 | if (handle) |
| 2656 | ext4_journal_stop(handle); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2657 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2658 | goto retry; |
| 2659 | return err; |
| 2660 | } |
| 2661 | |
| 2662 | /* |
| 2663 | * routine to check that the specified directory is empty (for rmdir) |
| 2664 | */ |
Michael Halcrow | e875a2d | 2015-04-11 07:46:49 -0400 | [diff] [blame] | 2665 | int ext4_empty_dir(struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2666 | { |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 2667 | unsigned int offset; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2668 | struct buffer_head *bh; |
| 2669 | struct ext4_dir_entry_2 *de, *de1; |
| 2670 | struct super_block *sb; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2671 | int err = 0; |
| 2672 | |
Tao Ma | 61f8663 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 2673 | if (ext4_has_inline_data(inode)) { |
| 2674 | int has_inline_data = 1; |
| 2675 | |
| 2676 | err = empty_inline_dir(inode, &has_inline_data); |
| 2677 | if (has_inline_data) |
| 2678 | return err; |
| 2679 | } |
| 2680 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2681 | sb = inode->i_sb; |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 2682 | if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2)) { |
| 2683 | EXT4_ERROR_INODE(inode, "invalid size"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2684 | return 1; |
| 2685 | } |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 2686 | bh = ext4_read_dirblock(inode, 0, EITHER); |
| 2687 | if (IS_ERR(bh)) |
| 2688 | return 1; |
| 2689 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2690 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2691 | de1 = ext4_next_entry(de, sb->s_blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2692 | if (le32_to_cpu(de->inode) != inode->i_ino || |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 2693 | le32_to_cpu(de1->inode) == 0 || |
| 2694 | strcmp(".", de->name) || strcmp("..", de1->name)) { |
| 2695 | ext4_warning_inode(inode, "directory missing '.' and/or '..'"); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2696 | brelse(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2697 | return 1; |
| 2698 | } |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2699 | offset = ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) + |
| 2700 | ext4_rec_len_from_disk(de1->rec_len, sb->s_blocksize); |
| 2701 | de = ext4_next_entry(de1, sb->s_blocksize); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2702 | while (offset < inode->i_size) { |
Dmitry Monakhov | 236f5ec | 2014-04-21 14:38:14 -0400 | [diff] [blame] | 2703 | if ((void *) de >= (void *) (bh->b_data+sb->s_blocksize)) { |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 2704 | unsigned int lblock; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2705 | err = 0; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2706 | brelse(bh); |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 2707 | lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb); |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 2708 | bh = ext4_read_dirblock(inode, lblock, EITHER); |
| 2709 | if (IS_ERR(bh)) |
| 2710 | return 1; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2711 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2712 | } |
Tao Ma | 226ba97 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 2713 | if (ext4_check_dir_entry(inode, NULL, de, bh, |
| 2714 | bh->b_data, bh->b_size, offset)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2715 | de = (struct ext4_dir_entry_2 *)(bh->b_data + |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2716 | sb->s_blocksize); |
| 2717 | offset = (offset | (sb->s_blocksize - 1)) + 1; |
| 2718 | continue; |
| 2719 | } |
| 2720 | if (le32_to_cpu(de->inode)) { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2721 | brelse(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2722 | return 0; |
| 2723 | } |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2724 | offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize); |
| 2725 | de = ext4_next_entry(de, sb->s_blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2726 | } |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2727 | brelse(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2728 | return 1; |
| 2729 | } |
| 2730 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2731 | /* |
| 2732 | * ext4_orphan_add() links an unlinked or truncated inode into a list of |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2733 | * such inodes, starting at the superblock, in case we crash before the |
| 2734 | * file is closed/deleted, or in case the inode truncate spans multiple |
| 2735 | * transactions and the last transaction is not recovered after a crash. |
| 2736 | * |
| 2737 | * At filesystem recovery time, we walk this list deleting unlinked |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2738 | * inodes and truncating linked inodes in ext4_orphan_cleanup(). |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2739 | * |
| 2740 | * Orphan list manipulation functions must be called under i_mutex unless |
| 2741 | * we are just creating the inode or deleting it. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2742 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2743 | int ext4_orphan_add(handle_t *handle, struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2744 | { |
| 2745 | struct super_block *sb = inode->i_sb; |
Jan Kara | cd2c080 | 2014-05-26 11:39:17 -0400 | [diff] [blame] | 2746 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2747 | struct ext4_iloc iloc; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2748 | int err = 0, rc; |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2749 | bool dirty = false; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2750 | |
Theodore Ts'o | e2bfb08 | 2014-10-05 22:47:07 -0400 | [diff] [blame] | 2751 | if (!sbi->s_journal || is_bad_inode(inode)) |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 2752 | return 0; |
| 2753 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2754 | WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) && |
| 2755 | !mutex_is_locked(&inode->i_mutex)); |
| 2756 | /* |
| 2757 | * Exit early if inode already is on orphan list. This is a big speedup |
| 2758 | * since we don't have to contend on the global s_orphan_lock. |
| 2759 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2760 | if (!list_empty(&EXT4_I(inode)->i_orphan)) |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2761 | return 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2762 | |
Lukas Czerner | afb8617 | 2011-07-11 18:47:04 -0400 | [diff] [blame] | 2763 | /* |
| 2764 | * Orphan handling is only valid for files with data blocks |
| 2765 | * being truncated, or files being unlinked. Note that we either |
| 2766 | * hold i_mutex, or the inode can not be referenced from outside, |
| 2767 | * so i_nlink should not be bumped due to race |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2768 | */ |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2769 | J_ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
| 2770 | S_ISLNK(inode->i_mode)) || inode->i_nlink == 0); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2771 | |
Jan Kara | cd2c080 | 2014-05-26 11:39:17 -0400 | [diff] [blame] | 2772 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
| 2773 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2774 | if (err) |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2775 | goto out; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2776 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2777 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2778 | if (err) |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2779 | goto out; |
| 2780 | |
| 2781 | mutex_lock(&sbi->s_orphan_lock); |
Dmitry Monakhov | 6e3617e | 2010-03-01 23:29:39 -0500 | [diff] [blame] | 2782 | /* |
| 2783 | * Due to previous errors inode may be already a part of on-disk |
| 2784 | * orphan list. If so skip on-disk list modification. |
| 2785 | */ |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2786 | if (!NEXT_ORPHAN(inode) || NEXT_ORPHAN(inode) > |
| 2787 | (le32_to_cpu(sbi->s_es->s_inodes_count))) { |
| 2788 | /* Insert this inode at the head of the on-disk orphan list */ |
| 2789 | NEXT_ORPHAN(inode) = le32_to_cpu(sbi->s_es->s_last_orphan); |
| 2790 | sbi->s_es->s_last_orphan = cpu_to_le32(inode->i_ino); |
| 2791 | dirty = true; |
| 2792 | } |
| 2793 | list_add(&EXT4_I(inode)->i_orphan, &sbi->s_orphan); |
| 2794 | mutex_unlock(&sbi->s_orphan_lock); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2795 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2796 | if (dirty) { |
| 2797 | err = ext4_handle_dirty_super(handle, sb); |
| 2798 | rc = ext4_mark_iloc_dirty(handle, inode, &iloc); |
| 2799 | if (!err) |
| 2800 | err = rc; |
| 2801 | if (err) { |
| 2802 | /* |
| 2803 | * We have to remove inode from in-memory list if |
| 2804 | * addition to on disk orphan list failed. Stray orphan |
| 2805 | * list entries can cause panics at unmount time. |
| 2806 | */ |
| 2807 | mutex_lock(&sbi->s_orphan_lock); |
| 2808 | list_del(&EXT4_I(inode)->i_orphan); |
| 2809 | mutex_unlock(&sbi->s_orphan_lock); |
| 2810 | } |
| 2811 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2812 | jbd_debug(4, "superblock will point to %lu\n", inode->i_ino); |
| 2813 | jbd_debug(4, "orphan inode %lu will point to %d\n", |
| 2814 | inode->i_ino, NEXT_ORPHAN(inode)); |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2815 | out: |
Jan Kara | cd2c080 | 2014-05-26 11:39:17 -0400 | [diff] [blame] | 2816 | ext4_std_error(sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2817 | return err; |
| 2818 | } |
| 2819 | |
| 2820 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2821 | * ext4_orphan_del() removes an unlinked or truncated inode from the list |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2822 | * of such inodes stored on disk, because it is finally being cleaned up. |
| 2823 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2824 | int ext4_orphan_del(handle_t *handle, struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2825 | { |
| 2826 | struct list_head *prev; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2827 | struct ext4_inode_info *ei = EXT4_I(inode); |
Jan Kara | cd2c080 | 2014-05-26 11:39:17 -0400 | [diff] [blame] | 2828 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 2829 | __u32 ino_next; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2830 | struct ext4_iloc iloc; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2831 | int err = 0; |
| 2832 | |
Jan Kara | cd2c080 | 2014-05-26 11:39:17 -0400 | [diff] [blame] | 2833 | if (!sbi->s_journal && !(sbi->s_mount_state & EXT4_ORPHAN_FS)) |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 2834 | return 0; |
| 2835 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2836 | WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) && |
| 2837 | !mutex_is_locked(&inode->i_mutex)); |
| 2838 | /* Do this quick check before taking global s_orphan_lock. */ |
Theodore Ts'o | 3b9d4ed | 2009-04-25 22:54:04 -0400 | [diff] [blame] | 2839 | if (list_empty(&ei->i_orphan)) |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2840 | return 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2841 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2842 | if (handle) { |
| 2843 | /* Grab inode buffer early before taking global s_orphan_lock */ |
| 2844 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
| 2845 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2846 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2847 | mutex_lock(&sbi->s_orphan_lock); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2848 | jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino); |
| 2849 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2850 | prev = ei->i_orphan.prev; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2851 | list_del_init(&ei->i_orphan); |
| 2852 | |
| 2853 | /* If we're on an error path, we may not have a valid |
| 2854 | * transaction handle with which to update the orphan list on |
| 2855 | * disk, but we still need to remove the inode from the linked |
| 2856 | * list in memory. */ |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2857 | if (!handle || err) { |
| 2858 | mutex_unlock(&sbi->s_orphan_lock); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2859 | goto out_err; |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2860 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2861 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2862 | ino_next = NEXT_ORPHAN(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2863 | if (prev == &sbi->s_orphan) { |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 2864 | jbd_debug(4, "superblock will point to %u\n", ino_next); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2865 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2866 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2867 | if (err) { |
| 2868 | mutex_unlock(&sbi->s_orphan_lock); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2869 | goto out_brelse; |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2870 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2871 | sbi->s_es->s_last_orphan = cpu_to_le32(ino_next); |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2872 | mutex_unlock(&sbi->s_orphan_lock); |
Artem Bityutskiy | b50924c | 2012-07-22 20:37:31 -0400 | [diff] [blame] | 2873 | err = ext4_handle_dirty_super(handle, inode->i_sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2874 | } else { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2875 | struct ext4_iloc iloc2; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2876 | struct inode *i_prev = |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2877 | &list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2878 | |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 2879 | jbd_debug(4, "orphan inode %lu will point to %u\n", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2880 | i_prev->i_ino, ino_next); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2881 | err = ext4_reserve_inode_write(handle, i_prev, &iloc2); |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2882 | if (err) { |
| 2883 | mutex_unlock(&sbi->s_orphan_lock); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2884 | goto out_brelse; |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2885 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2886 | NEXT_ORPHAN(i_prev) = ino_next; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2887 | err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2); |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2888 | mutex_unlock(&sbi->s_orphan_lock); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2889 | } |
| 2890 | if (err) |
| 2891 | goto out_brelse; |
| 2892 | NEXT_ORPHAN(inode) = 0; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2893 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2894 | out_err: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2895 | ext4_std_error(inode->i_sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2896 | return err; |
| 2897 | |
| 2898 | out_brelse: |
| 2899 | brelse(iloc.bh); |
| 2900 | goto out_err; |
| 2901 | } |
| 2902 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2903 | static int ext4_rmdir(struct inode *dir, struct dentry *dentry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2904 | { |
| 2905 | int retval; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2906 | struct inode *inode; |
| 2907 | struct buffer_head *bh; |
| 2908 | struct ext4_dir_entry_2 *de; |
Theodore Ts'o | 8dcfaad | 2013-02-09 09:45:11 -0500 | [diff] [blame] | 2909 | handle_t *handle = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2910 | |
| 2911 | /* Initialize quotas before so that eventual writes go in |
| 2912 | * separate transaction */ |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 2913 | dquot_initialize(dir); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 2914 | dquot_initialize(d_inode(dentry)); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 2915 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2916 | retval = -ENOENT; |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 2917 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 2918 | if (IS_ERR(bh)) |
| 2919 | return PTR_ERR(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2920 | if (!bh) |
| 2921 | goto end_rmdir; |
| 2922 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 2923 | inode = d_inode(dentry); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2924 | |
| 2925 | retval = -EIO; |
| 2926 | if (le32_to_cpu(de->inode) != inode->i_ino) |
| 2927 | goto end_rmdir; |
| 2928 | |
| 2929 | retval = -ENOTEMPTY; |
Michael Halcrow | e875a2d | 2015-04-11 07:46:49 -0400 | [diff] [blame] | 2930 | if (!ext4_empty_dir(inode)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2931 | goto end_rmdir; |
| 2932 | |
Theodore Ts'o | 8dcfaad | 2013-02-09 09:45:11 -0500 | [diff] [blame] | 2933 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
Theodore Ts'o | 64044ab | 2013-02-09 15:06:24 -0500 | [diff] [blame] | 2934 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb)); |
Theodore Ts'o | 8dcfaad | 2013-02-09 09:45:11 -0500 | [diff] [blame] | 2935 | if (IS_ERR(handle)) { |
| 2936 | retval = PTR_ERR(handle); |
| 2937 | handle = NULL; |
| 2938 | goto end_rmdir; |
| 2939 | } |
| 2940 | |
| 2941 | if (IS_DIRSYNC(dir)) |
| 2942 | ext4_handle_sync(handle); |
| 2943 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2944 | retval = ext4_delete_entry(handle, dir, de, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2945 | if (retval) |
| 2946 | goto end_rmdir; |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2947 | if (!EXT4_DIR_LINK_EMPTY(inode)) |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 2948 | ext4_warning_inode(inode, |
| 2949 | "empty directory '%.*s' has too many links (%u)", |
| 2950 | dentry->d_name.len, dentry->d_name.name, |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2951 | inode->i_nlink); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2952 | inode->i_version++; |
| 2953 | clear_nlink(inode); |
| 2954 | /* There's no need to set i_disksize: the fact that i_nlink is |
| 2955 | * zero will ensure that the right thing happens during any |
| 2956 | * recovery. */ |
| 2957 | inode->i_size = 0; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2958 | ext4_orphan_add(handle, inode); |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 2959 | inode->i_ctime = dir->i_ctime = dir->i_mtime = ext4_current_time(inode); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2960 | ext4_mark_inode_dirty(handle, inode); |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2961 | ext4_dec_count(handle, dir); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2962 | ext4_update_dx_flag(dir); |
| 2963 | ext4_mark_inode_dirty(handle, dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2964 | |
| 2965 | end_rmdir: |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2966 | brelse(bh); |
Theodore Ts'o | 8dcfaad | 2013-02-09 09:45:11 -0500 | [diff] [blame] | 2967 | if (handle) |
| 2968 | ext4_journal_stop(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2969 | return retval; |
| 2970 | } |
| 2971 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2972 | static int ext4_unlink(struct inode *dir, struct dentry *dentry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2973 | { |
| 2974 | int retval; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2975 | struct inode *inode; |
| 2976 | struct buffer_head *bh; |
| 2977 | struct ext4_dir_entry_2 *de; |
Theodore Ts'o | 931b686 | 2013-02-09 09:43:39 -0500 | [diff] [blame] | 2978 | handle_t *handle = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2979 | |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 2980 | trace_ext4_unlink_enter(dir, dentry); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2981 | /* Initialize quotas before so that eventual writes go |
| 2982 | * in separate transaction */ |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 2983 | dquot_initialize(dir); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 2984 | dquot_initialize(d_inode(dentry)); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 2985 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2986 | retval = -ENOENT; |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 2987 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 2988 | if (IS_ERR(bh)) |
| 2989 | return PTR_ERR(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2990 | if (!bh) |
| 2991 | goto end_unlink; |
| 2992 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 2993 | inode = d_inode(dentry); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2994 | |
| 2995 | retval = -EIO; |
| 2996 | if (le32_to_cpu(de->inode) != inode->i_ino) |
| 2997 | goto end_unlink; |
| 2998 | |
Theodore Ts'o | 931b686 | 2013-02-09 09:43:39 -0500 | [diff] [blame] | 2999 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
Theodore Ts'o | 64044ab | 2013-02-09 15:06:24 -0500 | [diff] [blame] | 3000 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb)); |
Theodore Ts'o | 931b686 | 2013-02-09 09:43:39 -0500 | [diff] [blame] | 3001 | if (IS_ERR(handle)) { |
| 3002 | retval = PTR_ERR(handle); |
| 3003 | handle = NULL; |
| 3004 | goto end_unlink; |
| 3005 | } |
| 3006 | |
| 3007 | if (IS_DIRSYNC(dir)) |
| 3008 | ext4_handle_sync(handle); |
| 3009 | |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 3010 | if (inode->i_nlink == 0) { |
| 3011 | ext4_warning_inode(inode, "Deleting file '%.*s' with no links", |
| 3012 | dentry->d_name.len, dentry->d_name.name); |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 3013 | set_nlink(inode, 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3014 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3015 | retval = ext4_delete_entry(handle, dir, de, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3016 | if (retval) |
| 3017 | goto end_unlink; |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 3018 | dir->i_ctime = dir->i_mtime = ext4_current_time(dir); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3019 | ext4_update_dx_flag(dir); |
| 3020 | ext4_mark_inode_dirty(handle, dir); |
Theodore Ts'o | 825f148 | 2008-02-15 15:00:38 -0500 | [diff] [blame] | 3021 | drop_nlink(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3022 | if (!inode->i_nlink) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3023 | ext4_orphan_add(handle, inode); |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 3024 | inode->i_ctime = ext4_current_time(inode); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3025 | ext4_mark_inode_dirty(handle, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3026 | |
| 3027 | end_unlink: |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 3028 | brelse(bh); |
Theodore Ts'o | 931b686 | 2013-02-09 09:43:39 -0500 | [diff] [blame] | 3029 | if (handle) |
| 3030 | ext4_journal_stop(handle); |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 3031 | trace_ext4_unlink_exit(dentry, retval); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3032 | return retval; |
| 3033 | } |
| 3034 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 3035 | static int ext4_symlink(struct inode *dir, |
| 3036 | struct dentry *dentry, const char *symname) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3037 | { |
| 3038 | handle_t *handle; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 3039 | struct inode *inode; |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3040 | int err, len = strlen(symname); |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3041 | int credits; |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3042 | bool encryption_required; |
| 3043 | struct ext4_str disk_link; |
| 3044 | struct ext4_encrypted_symlink_data *sd = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3045 | |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3046 | disk_link.len = len + 1; |
| 3047 | disk_link.name = (char *) symname; |
| 3048 | |
Theodore Ts'o | 6ddb244 | 2015-04-16 01:56:00 -0400 | [diff] [blame] | 3049 | encryption_required = (ext4_encrypted_inode(dir) || |
| 3050 | DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb))); |
Theodore Ts'o | 4d3c4e5 | 2015-05-31 13:35:32 -0400 | [diff] [blame] | 3051 | if (encryption_required) { |
| 3052 | err = ext4_get_encryption_info(dir); |
| 3053 | if (err) |
| 3054 | return err; |
| 3055 | if (ext4_encryption_info(dir) == NULL) |
| 3056 | return -EPERM; |
| 3057 | disk_link.len = (ext4_fname_encrypted_size(dir, len) + |
| 3058 | sizeof(struct ext4_encrypted_symlink_data)); |
| 3059 | sd = kzalloc(disk_link.len, GFP_KERNEL); |
| 3060 | if (!sd) |
| 3061 | return -ENOMEM; |
| 3062 | } |
| 3063 | |
| 3064 | if (disk_link.len > dir->i_sb->s_blocksize) { |
| 3065 | err = -ENAMETOOLONG; |
| 3066 | goto err_free_sd; |
| 3067 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3068 | |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 3069 | dquot_initialize(dir); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 3070 | |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3071 | if ((disk_link.len > EXT4_N_BLOCKS * 4)) { |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3072 | /* |
| 3073 | * For non-fast symlinks, we just allocate inode and put it on |
| 3074 | * orphan list in the first transaction => we need bitmap, |
Eric Sandeen | 8c20871 | 2011-08-11 09:54:31 -0500 | [diff] [blame] | 3075 | * group descriptor, sb, inode block, quota blocks, and |
| 3076 | * possibly selinux xattr blocks. |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3077 | */ |
Eric Sandeen | 8c20871 | 2011-08-11 09:54:31 -0500 | [diff] [blame] | 3078 | credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) + |
| 3079 | EXT4_XATTR_TRANS_BLOCKS; |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3080 | } else { |
| 3081 | /* |
| 3082 | * Fast symlink. We have to add entry to directory |
| 3083 | * (EXT4_DATA_TRANS_BLOCKS + EXT4_INDEX_EXTRA_TRANS_BLOCKS), |
| 3084 | * allocate new inode (bitmap, group descriptor, inode block, |
| 3085 | * quota blocks, sb is already counted in previous macros). |
| 3086 | */ |
| 3087 | credits = EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
Jan Kara | eb9cc7e | 2013-04-19 13:38:14 -0400 | [diff] [blame] | 3088 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3; |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3089 | } |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3090 | |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 3091 | inode = ext4_new_inode_start_handle(dir, S_IFLNK|S_IRWXUGO, |
| 3092 | &dentry->d_name, 0, NULL, |
| 3093 | EXT4_HT_DIR, credits); |
| 3094 | handle = ext4_journal_current_handle(); |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3095 | if (IS_ERR(inode)) { |
| 3096 | if (handle) |
| 3097 | ext4_journal_stop(handle); |
Theodore Ts'o | 4d3c4e5 | 2015-05-31 13:35:32 -0400 | [diff] [blame] | 3098 | err = PTR_ERR(inode); |
| 3099 | goto err_free_sd; |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3100 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3101 | |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3102 | if (encryption_required) { |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3103 | struct qstr istr; |
| 3104 | struct ext4_str ostr; |
| 3105 | |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3106 | istr.name = (const unsigned char *) symname; |
| 3107 | istr.len = len; |
| 3108 | ostr.name = sd->encrypted_path; |
Theodore Ts'o | d229959 | 2015-05-18 13:15:47 -0400 | [diff] [blame] | 3109 | ostr.len = disk_link.len; |
Theodore Ts'o | b7236e2 | 2015-05-18 13:17:47 -0400 | [diff] [blame] | 3110 | err = ext4_fname_usr_to_disk(inode, &istr, &ostr); |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3111 | if (err < 0) |
| 3112 | goto err_drop_inode; |
| 3113 | sd->len = cpu_to_le16(ostr.len); |
| 3114 | disk_link.name = (char *) sd; |
Al Viro | a7a67e8 | 2015-04-27 17:51:30 -0400 | [diff] [blame] | 3115 | inode->i_op = &ext4_encrypted_symlink_inode_operations; |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3116 | } |
| 3117 | |
| 3118 | if ((disk_link.len > EXT4_N_BLOCKS * 4)) { |
Al Viro | a7a67e8 | 2015-04-27 17:51:30 -0400 | [diff] [blame] | 3119 | if (!encryption_required) |
| 3120 | inode->i_op = &ext4_symlink_inode_operations; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3121 | ext4_set_aops(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3122 | /* |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3123 | * We cannot call page_symlink() with transaction started |
| 3124 | * because it calls into ext4_write_begin() which can wait |
| 3125 | * for transaction commit if we are running out of space |
| 3126 | * and thus we deadlock. So we have to stop transaction now |
| 3127 | * and restart it when symlink contents is written. |
| 3128 | * |
| 3129 | * To keep fs consistent in case of crash, we have to put inode |
| 3130 | * to orphan list in the mean time. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3131 | */ |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3132 | drop_nlink(inode); |
| 3133 | err = ext4_orphan_add(handle, inode); |
| 3134 | ext4_journal_stop(handle); |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3135 | handle = NULL; |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3136 | if (err) |
| 3137 | goto err_drop_inode; |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3138 | err = __page_symlink(inode, disk_link.name, disk_link.len, 1); |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3139 | if (err) |
| 3140 | goto err_drop_inode; |
| 3141 | /* |
| 3142 | * Now inode is being linked into dir (EXT4_DATA_TRANS_BLOCKS |
| 3143 | * + EXT4_INDEX_EXTRA_TRANS_BLOCKS), inode is also modified |
| 3144 | */ |
Theodore Ts'o | 9924a92 | 2013-02-08 21:59:22 -0500 | [diff] [blame] | 3145 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3146 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
| 3147 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 1); |
| 3148 | if (IS_ERR(handle)) { |
| 3149 | err = PTR_ERR(handle); |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3150 | handle = NULL; |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3151 | goto err_drop_inode; |
| 3152 | } |
Al Viro | 0ce8c010 | 2012-01-08 19:50:23 -0500 | [diff] [blame] | 3153 | set_nlink(inode, 1); |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3154 | err = ext4_orphan_del(handle, inode); |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3155 | if (err) |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3156 | goto err_drop_inode; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3157 | } else { |
Aneesh Kumar K.V | e65187e | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3158 | /* clear the extent format for fast symlink */ |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 3159 | ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); |
Al Viro | 75e7566 | 2015-05-02 10:13:58 -0400 | [diff] [blame] | 3160 | if (!encryption_required) { |
Al Viro | a7a67e8 | 2015-04-27 17:51:30 -0400 | [diff] [blame] | 3161 | inode->i_op = &ext4_fast_symlink_inode_operations; |
Al Viro | 75e7566 | 2015-05-02 10:13:58 -0400 | [diff] [blame] | 3162 | inode->i_link = (char *)&EXT4_I(inode)->i_data; |
| 3163 | } |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3164 | memcpy((char *)&EXT4_I(inode)->i_data, disk_link.name, |
| 3165 | disk_link.len); |
| 3166 | inode->i_size = disk_link.len - 1; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3167 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3168 | EXT4_I(inode)->i_disksize = inode->i_size; |
| 3169 | err = ext4_add_nondir(handle, dentry, inode); |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 3170 | if (!err && IS_DIRSYNC(dir)) |
| 3171 | ext4_handle_sync(handle); |
| 3172 | |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 3173 | if (handle) |
| 3174 | ext4_journal_stop(handle); |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3175 | kfree(sd); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3176 | return err; |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3177 | err_drop_inode: |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3178 | if (handle) |
| 3179 | ext4_journal_stop(handle); |
Theodore Ts'o | f348c25 | 2015-04-16 01:55:00 -0400 | [diff] [blame] | 3180 | clear_nlink(inode); |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3181 | unlock_new_inode(inode); |
| 3182 | iput(inode); |
Theodore Ts'o | 4d3c4e5 | 2015-05-31 13:35:32 -0400 | [diff] [blame] | 3183 | err_free_sd: |
| 3184 | kfree(sd); |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 3185 | return err; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3186 | } |
| 3187 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 3188 | static int ext4_link(struct dentry *old_dentry, |
| 3189 | struct inode *dir, struct dentry *dentry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3190 | { |
| 3191 | handle_t *handle; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 3192 | struct inode *inode = d_inode(old_dentry); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3193 | int err, retries = 0; |
| 3194 | |
Theodore Ts'o | b05ab1d | 2009-08-29 21:08:08 -0400 | [diff] [blame] | 3195 | if (inode->i_nlink >= EXT4_LINK_MAX) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3196 | return -EMLINK; |
Theodore Ts'o | d9cdc903 | 2015-04-12 00:55:08 -0400 | [diff] [blame] | 3197 | if (ext4_encrypted_inode(dir) && |
| 3198 | !ext4_is_child_context_consistent_with_parent(dir, inode)) |
| 3199 | return -EPERM; |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 3200 | dquot_initialize(dir); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 3201 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3202 | retry: |
Theodore Ts'o | 9924a92 | 2013-02-08 21:59:22 -0500 | [diff] [blame] | 3203 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
| 3204 | (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 3205 | EXT4_INDEX_EXTRA_TRANS_BLOCKS) + 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3206 | if (IS_ERR(handle)) |
| 3207 | return PTR_ERR(handle); |
| 3208 | |
| 3209 | if (IS_DIRSYNC(dir)) |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 3210 | ext4_handle_sync(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3211 | |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 3212 | inode->i_ctime = ext4_current_time(inode); |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 3213 | ext4_inc_count(handle, inode); |
Al Viro | 7de9c6ee | 2010-10-23 11:11:40 -0400 | [diff] [blame] | 3214 | ihold(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3215 | |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 3216 | err = ext4_add_entry(handle, dentry, inode); |
| 3217 | if (!err) { |
| 3218 | ext4_mark_inode_dirty(handle, inode); |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 3219 | /* this can happen only for tmpfile being |
| 3220 | * linked the first time |
| 3221 | */ |
| 3222 | if (inode->i_nlink == 1) |
| 3223 | ext4_orphan_del(handle, inode); |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 3224 | d_instantiate(dentry, inode); |
| 3225 | } else { |
| 3226 | drop_nlink(inode); |
| 3227 | iput(inode); |
| 3228 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3229 | ext4_journal_stop(handle); |
| 3230 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3231 | goto retry; |
| 3232 | return err; |
| 3233 | } |
| 3234 | |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 3235 | |
| 3236 | /* |
| 3237 | * Try to find buffer head where contains the parent block. |
| 3238 | * It should be the inode block if it is inlined or the 1st block |
| 3239 | * if it is a normal dir. |
| 3240 | */ |
| 3241 | static struct buffer_head *ext4_get_first_dir_block(handle_t *handle, |
| 3242 | struct inode *inode, |
| 3243 | int *retval, |
| 3244 | struct ext4_dir_entry_2 **parent_de, |
| 3245 | int *inlined) |
| 3246 | { |
| 3247 | struct buffer_head *bh; |
| 3248 | |
| 3249 | if (!ext4_has_inline_data(inode)) { |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 3250 | bh = ext4_read_dirblock(inode, 0, EITHER); |
| 3251 | if (IS_ERR(bh)) { |
| 3252 | *retval = PTR_ERR(bh); |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 3253 | return NULL; |
| 3254 | } |
| 3255 | *parent_de = ext4_next_entry( |
| 3256 | (struct ext4_dir_entry_2 *)bh->b_data, |
| 3257 | inode->i_sb->s_blocksize); |
| 3258 | return bh; |
| 3259 | } |
| 3260 | |
| 3261 | *inlined = 1; |
| 3262 | return ext4_get_first_inline_block(inode, parent_de, retval); |
| 3263 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3264 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3265 | struct ext4_renament { |
| 3266 | struct inode *dir; |
| 3267 | struct dentry *dentry; |
| 3268 | struct inode *inode; |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3269 | bool is_dir; |
| 3270 | int dir_nlink_delta; |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3271 | |
| 3272 | /* entry for "dentry" */ |
| 3273 | struct buffer_head *bh; |
| 3274 | struct ext4_dir_entry_2 *de; |
| 3275 | int inlined; |
| 3276 | |
| 3277 | /* entry for ".." in inode if it's a directory */ |
| 3278 | struct buffer_head *dir_bh; |
| 3279 | struct ext4_dir_entry_2 *parent_de; |
| 3280 | int dir_inlined; |
| 3281 | }; |
| 3282 | |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3283 | static int ext4_rename_dir_prepare(handle_t *handle, struct ext4_renament *ent) |
| 3284 | { |
| 3285 | int retval; |
| 3286 | |
| 3287 | ent->dir_bh = ext4_get_first_dir_block(handle, ent->inode, |
| 3288 | &retval, &ent->parent_de, |
| 3289 | &ent->dir_inlined); |
| 3290 | if (!ent->dir_bh) |
| 3291 | return retval; |
| 3292 | if (le32_to_cpu(ent->parent_de->inode) != ent->dir->i_ino) |
| 3293 | return -EIO; |
| 3294 | BUFFER_TRACE(ent->dir_bh, "get_write_access"); |
| 3295 | return ext4_journal_get_write_access(handle, ent->dir_bh); |
| 3296 | } |
| 3297 | |
| 3298 | static int ext4_rename_dir_finish(handle_t *handle, struct ext4_renament *ent, |
| 3299 | unsigned dir_ino) |
| 3300 | { |
| 3301 | int retval; |
| 3302 | |
| 3303 | ent->parent_de->inode = cpu_to_le32(dir_ino); |
| 3304 | BUFFER_TRACE(ent->dir_bh, "call ext4_handle_dirty_metadata"); |
| 3305 | if (!ent->dir_inlined) { |
| 3306 | if (is_dx(ent->inode)) { |
| 3307 | retval = ext4_handle_dirty_dx_node(handle, |
| 3308 | ent->inode, |
| 3309 | ent->dir_bh); |
| 3310 | } else { |
| 3311 | retval = ext4_handle_dirty_dirent_node(handle, |
| 3312 | ent->inode, |
| 3313 | ent->dir_bh); |
| 3314 | } |
| 3315 | } else { |
| 3316 | retval = ext4_mark_inode_dirty(handle, ent->inode); |
| 3317 | } |
| 3318 | if (retval) { |
| 3319 | ext4_std_error(ent->dir->i_sb, retval); |
| 3320 | return retval; |
| 3321 | } |
| 3322 | return 0; |
| 3323 | } |
| 3324 | |
| 3325 | static int ext4_setent(handle_t *handle, struct ext4_renament *ent, |
| 3326 | unsigned ino, unsigned file_type) |
| 3327 | { |
| 3328 | int retval; |
| 3329 | |
| 3330 | BUFFER_TRACE(ent->bh, "get write access"); |
| 3331 | retval = ext4_journal_get_write_access(handle, ent->bh); |
| 3332 | if (retval) |
| 3333 | return retval; |
| 3334 | ent->de->inode = cpu_to_le32(ino); |
| 3335 | if (EXT4_HAS_INCOMPAT_FEATURE(ent->dir->i_sb, |
| 3336 | EXT4_FEATURE_INCOMPAT_FILETYPE)) |
| 3337 | ent->de->file_type = file_type; |
| 3338 | ent->dir->i_version++; |
| 3339 | ent->dir->i_ctime = ent->dir->i_mtime = |
| 3340 | ext4_current_time(ent->dir); |
| 3341 | ext4_mark_inode_dirty(handle, ent->dir); |
| 3342 | BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata"); |
| 3343 | if (!ent->inlined) { |
| 3344 | retval = ext4_handle_dirty_dirent_node(handle, |
| 3345 | ent->dir, ent->bh); |
| 3346 | if (unlikely(retval)) { |
| 3347 | ext4_std_error(ent->dir->i_sb, retval); |
| 3348 | return retval; |
| 3349 | } |
| 3350 | } |
| 3351 | brelse(ent->bh); |
| 3352 | ent->bh = NULL; |
| 3353 | |
| 3354 | return 0; |
| 3355 | } |
| 3356 | |
| 3357 | static int ext4_find_delete_entry(handle_t *handle, struct inode *dir, |
| 3358 | const struct qstr *d_name) |
| 3359 | { |
| 3360 | int retval = -ENOENT; |
| 3361 | struct buffer_head *bh; |
| 3362 | struct ext4_dir_entry_2 *de; |
| 3363 | |
| 3364 | bh = ext4_find_entry(dir, d_name, &de, NULL); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 3365 | if (IS_ERR(bh)) |
| 3366 | return PTR_ERR(bh); |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3367 | if (bh) { |
| 3368 | retval = ext4_delete_entry(handle, dir, de, bh); |
| 3369 | brelse(bh); |
| 3370 | } |
| 3371 | return retval; |
| 3372 | } |
| 3373 | |
Darrick J. Wong | d80d448 | 2014-08-27 18:40:09 -0400 | [diff] [blame] | 3374 | static void ext4_rename_delete(handle_t *handle, struct ext4_renament *ent, |
| 3375 | int force_reread) |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3376 | { |
| 3377 | int retval; |
| 3378 | /* |
| 3379 | * ent->de could have moved from under us during htree split, so make |
| 3380 | * sure that we are deleting the right entry. We might also be pointing |
| 3381 | * to a stale entry in the unused part of ent->bh so just checking inum |
| 3382 | * and the name isn't enough. |
| 3383 | */ |
| 3384 | if (le32_to_cpu(ent->de->inode) != ent->inode->i_ino || |
| 3385 | ent->de->name_len != ent->dentry->d_name.len || |
| 3386 | strncmp(ent->de->name, ent->dentry->d_name.name, |
Darrick J. Wong | d80d448 | 2014-08-27 18:40:09 -0400 | [diff] [blame] | 3387 | ent->de->name_len) || |
| 3388 | force_reread) { |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3389 | retval = ext4_find_delete_entry(handle, ent->dir, |
| 3390 | &ent->dentry->d_name); |
| 3391 | } else { |
| 3392 | retval = ext4_delete_entry(handle, ent->dir, ent->de, ent->bh); |
| 3393 | if (retval == -ENOENT) { |
| 3394 | retval = ext4_find_delete_entry(handle, ent->dir, |
| 3395 | &ent->dentry->d_name); |
| 3396 | } |
| 3397 | } |
| 3398 | |
| 3399 | if (retval) { |
Andreas Dilger | b03a2f7 | 2015-06-15 14:50:26 -0400 | [diff] [blame] | 3400 | ext4_warning_inode(ent->dir, |
| 3401 | "Deleting old file: nlink %d, error=%d", |
| 3402 | ent->dir->i_nlink, retval); |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3403 | } |
| 3404 | } |
| 3405 | |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3406 | static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent) |
| 3407 | { |
| 3408 | if (ent->dir_nlink_delta) { |
| 3409 | if (ent->dir_nlink_delta == -1) |
| 3410 | ext4_dec_count(handle, ent->dir); |
| 3411 | else |
| 3412 | ext4_inc_count(handle, ent->dir); |
| 3413 | ext4_mark_inode_dirty(handle, ent->dir); |
| 3414 | } |
| 3415 | } |
| 3416 | |
Miklos Szeredi | cd808de | 2014-10-24 00:14:37 +0200 | [diff] [blame] | 3417 | static struct inode *ext4_whiteout_for_rename(struct ext4_renament *ent, |
| 3418 | int credits, handle_t **h) |
| 3419 | { |
| 3420 | struct inode *wh; |
| 3421 | handle_t *handle; |
| 3422 | int retries = 0; |
| 3423 | |
| 3424 | /* |
| 3425 | * for inode block, sb block, group summaries, |
| 3426 | * and inode bitmap |
| 3427 | */ |
| 3428 | credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) + |
| 3429 | EXT4_XATTR_TRANS_BLOCKS + 4); |
| 3430 | retry: |
| 3431 | wh = ext4_new_inode_start_handle(ent->dir, S_IFCHR | WHITEOUT_MODE, |
| 3432 | &ent->dentry->d_name, 0, NULL, |
| 3433 | EXT4_HT_DIR, credits); |
| 3434 | |
| 3435 | handle = ext4_journal_current_handle(); |
| 3436 | if (IS_ERR(wh)) { |
| 3437 | if (handle) |
| 3438 | ext4_journal_stop(handle); |
| 3439 | if (PTR_ERR(wh) == -ENOSPC && |
| 3440 | ext4_should_retry_alloc(ent->dir->i_sb, &retries)) |
| 3441 | goto retry; |
| 3442 | } else { |
| 3443 | *h = handle; |
| 3444 | init_special_inode(wh, wh->i_mode, WHITEOUT_DEV); |
| 3445 | wh->i_op = &ext4_special_inode_operations; |
| 3446 | } |
| 3447 | return wh; |
| 3448 | } |
| 3449 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3450 | /* |
| 3451 | * Anybody can rename anything with this: the permission checks are left to the |
| 3452 | * higher-level routines. |
Theodore Ts'o | 0e20270 | 2013-08-16 22:06:53 -0400 | [diff] [blame] | 3453 | * |
| 3454 | * n.b. old_{dentry,inode) refers to the source dentry/inode |
| 3455 | * while new_{dentry,inode) refers to the destination dentry/inode |
| 3456 | * This comes from rename(const char *oldpath, const char *newpath) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3457 | */ |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 3458 | static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry, |
Miklos Szeredi | cd808de | 2014-10-24 00:14:37 +0200 | [diff] [blame] | 3459 | struct inode *new_dir, struct dentry *new_dentry, |
| 3460 | unsigned int flags) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3461 | { |
Theodore Ts'o | 5b61de7 | 2013-08-16 22:06:14 -0400 | [diff] [blame] | 3462 | handle_t *handle = NULL; |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3463 | struct ext4_renament old = { |
| 3464 | .dir = old_dir, |
| 3465 | .dentry = old_dentry, |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 3466 | .inode = d_inode(old_dentry), |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3467 | }; |
| 3468 | struct ext4_renament new = { |
| 3469 | .dir = new_dir, |
| 3470 | .dentry = new_dentry, |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 3471 | .inode = d_inode(new_dentry), |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3472 | }; |
Darrick J. Wong | d80d448 | 2014-08-27 18:40:09 -0400 | [diff] [blame] | 3473 | int force_reread; |
Theodore Ts'o | 0e20270 | 2013-08-16 22:06:53 -0400 | [diff] [blame] | 3474 | int retval; |
Miklos Szeredi | cd808de | 2014-10-24 00:14:37 +0200 | [diff] [blame] | 3475 | struct inode *whiteout = NULL; |
| 3476 | int credits; |
| 3477 | u8 old_file_type; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3478 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3479 | dquot_initialize(old.dir); |
| 3480 | dquot_initialize(new.dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3481 | |
| 3482 | /* Initialize quotas before so that eventual writes go |
| 3483 | * in separate transaction */ |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3484 | if (new.inode) |
| 3485 | dquot_initialize(new.inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3486 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3487 | old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 3488 | if (IS_ERR(old.bh)) |
| 3489 | return PTR_ERR(old.bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3490 | /* |
| 3491 | * Check for inode number is _not_ due to possible IO errors. |
| 3492 | * We might rmdir the source, keep it as pwd of some process |
| 3493 | * and merrily kill the link to whatever was created under the |
| 3494 | * same name. Goodbye sticky bit ;-< |
| 3495 | */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3496 | retval = -ENOENT; |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3497 | if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3498 | goto end_rename; |
| 3499 | |
Theodore Ts'o | d9cdc903 | 2015-04-12 00:55:08 -0400 | [diff] [blame] | 3500 | if ((old.dir != new.dir) && |
| 3501 | ext4_encrypted_inode(new.dir) && |
| 3502 | !ext4_is_child_context_consistent_with_parent(new.dir, |
| 3503 | old.inode)) { |
| 3504 | retval = -EPERM; |
| 3505 | goto end_rename; |
| 3506 | } |
| 3507 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3508 | new.bh = ext4_find_entry(new.dir, &new.dentry->d_name, |
| 3509 | &new.de, &new.inlined); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 3510 | if (IS_ERR(new.bh)) { |
| 3511 | retval = PTR_ERR(new.bh); |
Theodore Ts'o | a9cfcd6 | 2014-09-03 09:33:00 -0400 | [diff] [blame] | 3512 | new.bh = NULL; |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 3513 | goto end_rename; |
| 3514 | } |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3515 | if (new.bh) { |
| 3516 | if (!new.inode) { |
| 3517 | brelse(new.bh); |
| 3518 | new.bh = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3519 | } |
| 3520 | } |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3521 | if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC)) |
| 3522 | ext4_alloc_da_blocks(old.inode); |
Theodore Ts'o | 5b61de7 | 2013-08-16 22:06:14 -0400 | [diff] [blame] | 3523 | |
Miklos Szeredi | cd808de | 2014-10-24 00:14:37 +0200 | [diff] [blame] | 3524 | credits = (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) + |
| 3525 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2); |
| 3526 | if (!(flags & RENAME_WHITEOUT)) { |
| 3527 | handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits); |
Konstantin Khlebnikov | 7071b71 | 2015-04-02 16:32:15 -0400 | [diff] [blame] | 3528 | if (IS_ERR(handle)) { |
| 3529 | retval = PTR_ERR(handle); |
| 3530 | handle = NULL; |
| 3531 | goto end_rename; |
| 3532 | } |
Miklos Szeredi | cd808de | 2014-10-24 00:14:37 +0200 | [diff] [blame] | 3533 | } else { |
| 3534 | whiteout = ext4_whiteout_for_rename(&old, credits, &handle); |
Konstantin Khlebnikov | 7071b71 | 2015-04-02 16:32:15 -0400 | [diff] [blame] | 3535 | if (IS_ERR(whiteout)) { |
| 3536 | retval = PTR_ERR(whiteout); |
| 3537 | whiteout = NULL; |
| 3538 | goto end_rename; |
| 3539 | } |
Miklos Szeredi | cd808de | 2014-10-24 00:14:37 +0200 | [diff] [blame] | 3540 | } |
Theodore Ts'o | 5b61de7 | 2013-08-16 22:06:14 -0400 | [diff] [blame] | 3541 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3542 | if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir)) |
Theodore Ts'o | 5b61de7 | 2013-08-16 22:06:14 -0400 | [diff] [blame] | 3543 | ext4_handle_sync(handle); |
| 3544 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3545 | if (S_ISDIR(old.inode->i_mode)) { |
| 3546 | if (new.inode) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3547 | retval = -ENOTEMPTY; |
Michael Halcrow | e875a2d | 2015-04-11 07:46:49 -0400 | [diff] [blame] | 3548 | if (!ext4_empty_dir(new.inode)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3549 | goto end_rename; |
Miklos Szeredi | 0d7d5d6 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3550 | } else { |
| 3551 | retval = -EMLINK; |
| 3552 | if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir)) |
| 3553 | goto end_rename; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3554 | } |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3555 | retval = ext4_rename_dir_prepare(handle, &old); |
Amir Goldstein | ef60789 | 2011-03-20 21:18:44 -0400 | [diff] [blame] | 3556 | if (retval) |
| 3557 | goto end_rename; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3558 | } |
Darrick J. Wong | d80d448 | 2014-08-27 18:40:09 -0400 | [diff] [blame] | 3559 | /* |
| 3560 | * If we're renaming a file within an inline_data dir and adding or |
| 3561 | * setting the new dirent causes a conversion from inline_data to |
| 3562 | * extents/blockmap, we need to force the dirent delete code to |
| 3563 | * re-read the directory, or else we end up trying to delete a dirent |
| 3564 | * from what is now the extent tree root (or a block map). |
| 3565 | */ |
| 3566 | force_reread = (new.dir->i_ino == old.dir->i_ino && |
| 3567 | ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA)); |
Miklos Szeredi | cd808de | 2014-10-24 00:14:37 +0200 | [diff] [blame] | 3568 | |
| 3569 | old_file_type = old.de->file_type; |
| 3570 | if (whiteout) { |
| 3571 | /* |
| 3572 | * Do this before adding a new entry, so the old entry is sure |
| 3573 | * to be still pointing to the valid old entry. |
| 3574 | */ |
| 3575 | retval = ext4_setent(handle, &old, whiteout->i_ino, |
| 3576 | EXT4_FT_CHRDEV); |
| 3577 | if (retval) |
| 3578 | goto end_rename; |
| 3579 | ext4_mark_inode_dirty(handle, whiteout); |
| 3580 | } |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3581 | if (!new.bh) { |
| 3582 | retval = ext4_add_entry(handle, new.dentry, old.inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3583 | if (retval) |
| 3584 | goto end_rename; |
| 3585 | } else { |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3586 | retval = ext4_setent(handle, &new, |
Miklos Szeredi | cd808de | 2014-10-24 00:14:37 +0200 | [diff] [blame] | 3587 | old.inode->i_ino, old_file_type); |
Amir Goldstein | ef60789 | 2011-03-20 21:18:44 -0400 | [diff] [blame] | 3588 | if (retval) |
| 3589 | goto end_rename; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3590 | } |
Darrick J. Wong | d80d448 | 2014-08-27 18:40:09 -0400 | [diff] [blame] | 3591 | if (force_reread) |
| 3592 | force_reread = !ext4_test_inode_flag(new.dir, |
| 3593 | EXT4_INODE_INLINE_DATA); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3594 | |
| 3595 | /* |
| 3596 | * Like most other Unix systems, set the ctime for inodes on a |
| 3597 | * rename. |
| 3598 | */ |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3599 | old.inode->i_ctime = ext4_current_time(old.inode); |
| 3600 | ext4_mark_inode_dirty(handle, old.inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3601 | |
Miklos Szeredi | cd808de | 2014-10-24 00:14:37 +0200 | [diff] [blame] | 3602 | if (!whiteout) { |
| 3603 | /* |
| 3604 | * ok, that's it |
| 3605 | */ |
| 3606 | ext4_rename_delete(handle, &old, force_reread); |
| 3607 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3608 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3609 | if (new.inode) { |
| 3610 | ext4_dec_count(handle, new.inode); |
| 3611 | new.inode->i_ctime = ext4_current_time(new.inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3612 | } |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3613 | old.dir->i_ctime = old.dir->i_mtime = ext4_current_time(old.dir); |
| 3614 | ext4_update_dx_flag(old.dir); |
| 3615 | if (old.dir_bh) { |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3616 | retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino); |
| 3617 | if (retval) |
Theodore Ts'o | b409714 | 2011-01-10 12:46:59 -0500 | [diff] [blame] | 3618 | goto end_rename; |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3619 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3620 | ext4_dec_count(handle, old.dir); |
| 3621 | if (new.inode) { |
Michael Halcrow | e875a2d | 2015-04-11 07:46:49 -0400 | [diff] [blame] | 3622 | /* checked ext4_empty_dir above, can't have another |
| 3623 | * parent, ext4_dec_count() won't work for many-linked |
| 3624 | * dirs */ |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3625 | clear_nlink(new.inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3626 | } else { |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3627 | ext4_inc_count(handle, new.dir); |
| 3628 | ext4_update_dx_flag(new.dir); |
| 3629 | ext4_mark_inode_dirty(handle, new.dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3630 | } |
| 3631 | } |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3632 | ext4_mark_inode_dirty(handle, old.dir); |
| 3633 | if (new.inode) { |
| 3634 | ext4_mark_inode_dirty(handle, new.inode); |
| 3635 | if (!new.inode->i_nlink) |
| 3636 | ext4_orphan_add(handle, new.inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3637 | } |
| 3638 | retval = 0; |
| 3639 | |
| 3640 | end_rename: |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3641 | brelse(old.dir_bh); |
| 3642 | brelse(old.bh); |
| 3643 | brelse(new.bh); |
Miklos Szeredi | cd808de | 2014-10-24 00:14:37 +0200 | [diff] [blame] | 3644 | if (whiteout) { |
| 3645 | if (retval) |
| 3646 | drop_nlink(whiteout); |
| 3647 | unlock_new_inode(whiteout); |
| 3648 | iput(whiteout); |
| 3649 | } |
Theodore Ts'o | 5b61de7 | 2013-08-16 22:06:14 -0400 | [diff] [blame] | 3650 | if (handle) |
| 3651 | ext4_journal_stop(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3652 | return retval; |
| 3653 | } |
| 3654 | |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3655 | static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 3656 | struct inode *new_dir, struct dentry *new_dentry) |
| 3657 | { |
| 3658 | handle_t *handle = NULL; |
| 3659 | struct ext4_renament old = { |
| 3660 | .dir = old_dir, |
| 3661 | .dentry = old_dentry, |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 3662 | .inode = d_inode(old_dentry), |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3663 | }; |
| 3664 | struct ext4_renament new = { |
| 3665 | .dir = new_dir, |
| 3666 | .dentry = new_dentry, |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 3667 | .inode = d_inode(new_dentry), |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3668 | }; |
| 3669 | u8 new_file_type; |
| 3670 | int retval; |
| 3671 | |
Theodore Ts'o | c2facca | 2015-05-31 13:35:09 -0400 | [diff] [blame] | 3672 | if ((ext4_encrypted_inode(old_dir) || |
| 3673 | ext4_encrypted_inode(new_dir)) && |
| 3674 | (old_dir != new_dir) && |
| 3675 | (!ext4_is_child_context_consistent_with_parent(new_dir, |
| 3676 | old.inode) || |
| 3677 | !ext4_is_child_context_consistent_with_parent(old_dir, |
| 3678 | new.inode))) |
| 3679 | return -EPERM; |
| 3680 | |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3681 | dquot_initialize(old.dir); |
| 3682 | dquot_initialize(new.dir); |
| 3683 | |
| 3684 | old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, |
| 3685 | &old.de, &old.inlined); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 3686 | if (IS_ERR(old.bh)) |
| 3687 | return PTR_ERR(old.bh); |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3688 | /* |
| 3689 | * Check for inode number is _not_ due to possible IO errors. |
| 3690 | * We might rmdir the source, keep it as pwd of some process |
| 3691 | * and merrily kill the link to whatever was created under the |
| 3692 | * same name. Goodbye sticky bit ;-< |
| 3693 | */ |
| 3694 | retval = -ENOENT; |
| 3695 | if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino) |
| 3696 | goto end_rename; |
| 3697 | |
| 3698 | new.bh = ext4_find_entry(new.dir, &new.dentry->d_name, |
| 3699 | &new.de, &new.inlined); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 3700 | if (IS_ERR(new.bh)) { |
| 3701 | retval = PTR_ERR(new.bh); |
Theodore Ts'o | a9cfcd6 | 2014-09-03 09:33:00 -0400 | [diff] [blame] | 3702 | new.bh = NULL; |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 3703 | goto end_rename; |
| 3704 | } |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3705 | |
| 3706 | /* RENAME_EXCHANGE case: old *and* new must both exist */ |
| 3707 | if (!new.bh || le32_to_cpu(new.de->inode) != new.inode->i_ino) |
| 3708 | goto end_rename; |
| 3709 | |
| 3710 | handle = ext4_journal_start(old.dir, EXT4_HT_DIR, |
| 3711 | (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) + |
| 3712 | 2 * EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2)); |
Konstantin Khlebnikov | 7071b71 | 2015-04-02 16:32:15 -0400 | [diff] [blame] | 3713 | if (IS_ERR(handle)) { |
| 3714 | retval = PTR_ERR(handle); |
| 3715 | handle = NULL; |
| 3716 | goto end_rename; |
| 3717 | } |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3718 | |
| 3719 | if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir)) |
| 3720 | ext4_handle_sync(handle); |
| 3721 | |
| 3722 | if (S_ISDIR(old.inode->i_mode)) { |
| 3723 | old.is_dir = true; |
| 3724 | retval = ext4_rename_dir_prepare(handle, &old); |
| 3725 | if (retval) |
| 3726 | goto end_rename; |
| 3727 | } |
| 3728 | if (S_ISDIR(new.inode->i_mode)) { |
| 3729 | new.is_dir = true; |
| 3730 | retval = ext4_rename_dir_prepare(handle, &new); |
| 3731 | if (retval) |
| 3732 | goto end_rename; |
| 3733 | } |
| 3734 | |
| 3735 | /* |
| 3736 | * Other than the special case of overwriting a directory, parents' |
| 3737 | * nlink only needs to be modified if this is a cross directory rename. |
| 3738 | */ |
| 3739 | if (old.dir != new.dir && old.is_dir != new.is_dir) { |
| 3740 | old.dir_nlink_delta = old.is_dir ? -1 : 1; |
| 3741 | new.dir_nlink_delta = -old.dir_nlink_delta; |
| 3742 | retval = -EMLINK; |
| 3743 | if ((old.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(old.dir)) || |
| 3744 | (new.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(new.dir))) |
| 3745 | goto end_rename; |
| 3746 | } |
| 3747 | |
| 3748 | new_file_type = new.de->file_type; |
| 3749 | retval = ext4_setent(handle, &new, old.inode->i_ino, old.de->file_type); |
| 3750 | if (retval) |
| 3751 | goto end_rename; |
| 3752 | |
| 3753 | retval = ext4_setent(handle, &old, new.inode->i_ino, new_file_type); |
| 3754 | if (retval) |
| 3755 | goto end_rename; |
| 3756 | |
| 3757 | /* |
| 3758 | * Like most other Unix systems, set the ctime for inodes on a |
| 3759 | * rename. |
| 3760 | */ |
| 3761 | old.inode->i_ctime = ext4_current_time(old.inode); |
| 3762 | new.inode->i_ctime = ext4_current_time(new.inode); |
| 3763 | ext4_mark_inode_dirty(handle, old.inode); |
| 3764 | ext4_mark_inode_dirty(handle, new.inode); |
| 3765 | |
| 3766 | if (old.dir_bh) { |
| 3767 | retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino); |
| 3768 | if (retval) |
| 3769 | goto end_rename; |
| 3770 | } |
| 3771 | if (new.dir_bh) { |
| 3772 | retval = ext4_rename_dir_finish(handle, &new, old.dir->i_ino); |
| 3773 | if (retval) |
| 3774 | goto end_rename; |
| 3775 | } |
| 3776 | ext4_update_dir_count(handle, &old); |
| 3777 | ext4_update_dir_count(handle, &new); |
| 3778 | retval = 0; |
| 3779 | |
| 3780 | end_rename: |
| 3781 | brelse(old.dir_bh); |
| 3782 | brelse(new.dir_bh); |
| 3783 | brelse(old.bh); |
| 3784 | brelse(new.bh); |
| 3785 | if (handle) |
| 3786 | ext4_journal_stop(handle); |
| 3787 | return retval; |
| 3788 | } |
| 3789 | |
Miklos Szeredi | 0a7c393 | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3790 | static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry, |
| 3791 | struct inode *new_dir, struct dentry *new_dentry, |
| 3792 | unsigned int flags) |
| 3793 | { |
Miklos Szeredi | cd808de | 2014-10-24 00:14:37 +0200 | [diff] [blame] | 3794 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) |
Miklos Szeredi | 0a7c393 | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3795 | return -EINVAL; |
| 3796 | |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3797 | if (flags & RENAME_EXCHANGE) { |
| 3798 | return ext4_cross_rename(old_dir, old_dentry, |
| 3799 | new_dir, new_dentry); |
| 3800 | } |
Miklos Szeredi | cd808de | 2014-10-24 00:14:37 +0200 | [diff] [blame] | 3801 | |
| 3802 | return ext4_rename(old_dir, old_dentry, new_dir, new_dentry, flags); |
Miklos Szeredi | 0a7c393 | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3803 | } |
| 3804 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3805 | /* |
| 3806 | * directories can handle most operations... |
| 3807 | */ |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 3808 | const struct inode_operations ext4_dir_inode_operations = { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3809 | .create = ext4_create, |
| 3810 | .lookup = ext4_lookup, |
| 3811 | .link = ext4_link, |
| 3812 | .unlink = ext4_unlink, |
| 3813 | .symlink = ext4_symlink, |
| 3814 | .mkdir = ext4_mkdir, |
| 3815 | .rmdir = ext4_rmdir, |
| 3816 | .mknod = ext4_mknod, |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 3817 | .tmpfile = ext4_tmpfile, |
Miklos Szeredi | 0a7c393 | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3818 | .rename2 = ext4_rename2, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3819 | .setattr = ext4_setattr, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3820 | .setxattr = generic_setxattr, |
| 3821 | .getxattr = generic_getxattr, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3822 | .listxattr = ext4_listxattr, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3823 | .removexattr = generic_removexattr, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 3824 | .get_acl = ext4_get_acl, |
Christoph Hellwig | 64e178a | 2013-12-20 05:16:44 -0800 | [diff] [blame] | 3825 | .set_acl = ext4_set_acl, |
Aneesh Kumar K.V | abc8746 | 2009-05-02 22:54:32 -0400 | [diff] [blame] | 3826 | .fiemap = ext4_fiemap, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3827 | }; |
| 3828 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 3829 | const struct inode_operations ext4_special_inode_operations = { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3830 | .setattr = ext4_setattr, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3831 | .setxattr = generic_setxattr, |
| 3832 | .getxattr = generic_getxattr, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3833 | .listxattr = ext4_listxattr, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3834 | .removexattr = generic_removexattr, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 3835 | .get_acl = ext4_get_acl, |
Christoph Hellwig | 64e178a | 2013-12-20 05:16:44 -0800 | [diff] [blame] | 3836 | .set_acl = ext4_set_acl, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3837 | }; |