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> |
Mingming Cao | dab291a | 2006-10-11 01:21:01 -0700 | [diff] [blame] | 29 | #include <linux/jbd2.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 30 | #include <linux/time.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 31 | #include <linux/fcntl.h> |
| 32 | #include <linux/stat.h> |
| 33 | #include <linux/string.h> |
| 34 | #include <linux/quotaops.h> |
| 35 | #include <linux/buffer_head.h> |
| 36 | #include <linux/bio.h> |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 37 | #include "ext4.h" |
| 38 | #include "ext4_jbd2.h" |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 39 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 40 | #include "xattr.h" |
| 41 | #include "acl.h" |
| 42 | |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 43 | #include <trace/events/ext4.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 44 | /* |
| 45 | * define how far ahead to read directories while searching them. |
| 46 | */ |
| 47 | #define NAMEI_RA_CHUNKS 2 |
| 48 | #define NAMEI_RA_BLOCKS 4 |
Dave Kleikamp | 8c55e20 | 2007-05-24 13:04:54 -0400 | [diff] [blame] | 49 | #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 50 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 51 | static struct buffer_head *ext4_append(handle_t *handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 52 | struct inode *inode, |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 53 | ext4_lblk_t *block) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 54 | { |
| 55 | struct buffer_head *bh; |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 56 | int err = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 57 | |
Theodore Ts'o | df981d0 | 2012-08-17 09:48:17 -0400 | [diff] [blame] | 58 | if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb && |
| 59 | ((inode->i_size >> 10) >= |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 60 | EXT4_SB(inode->i_sb)->s_max_dir_size_kb))) |
| 61 | return ERR_PTR(-ENOSPC); |
Theodore Ts'o | df981d0 | 2012-08-17 09:48:17 -0400 | [diff] [blame] | 62 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 63 | *block = inode->i_size >> inode->i_sb->s_blocksize_bits; |
| 64 | |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 65 | bh = ext4_bread(handle, inode, *block, 1, &err); |
| 66 | if (!bh) |
| 67 | return ERR_PTR(err); |
| 68 | inode->i_size += inode->i_sb->s_blocksize; |
| 69 | EXT4_I(inode)->i_disksize = inode->i_size; |
liang xie | 5d60125 | 2014-05-12 22:06:43 -0400 | [diff] [blame] | 70 | BUFFER_TRACE(bh, "get_write_access"); |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 71 | err = ext4_journal_get_write_access(handle, bh); |
| 72 | if (err) { |
| 73 | brelse(bh); |
| 74 | ext4_std_error(inode->i_sb, err); |
| 75 | return ERR_PTR(err); |
Carlos Maiolino | 6d1ab10 | 2012-09-27 09:31:33 -0400 | [diff] [blame] | 76 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 77 | return bh; |
| 78 | } |
| 79 | |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 80 | static int ext4_dx_csum_verify(struct inode *inode, |
| 81 | struct ext4_dir_entry *dirent); |
| 82 | |
| 83 | typedef enum { |
| 84 | EITHER, INDEX, DIRENT |
| 85 | } dirblock_type_t; |
| 86 | |
| 87 | #define ext4_read_dirblock(inode, block, type) \ |
| 88 | __ext4_read_dirblock((inode), (block), (type), __LINE__) |
| 89 | |
| 90 | static struct buffer_head *__ext4_read_dirblock(struct inode *inode, |
| 91 | ext4_lblk_t block, |
| 92 | dirblock_type_t type, |
| 93 | unsigned int line) |
| 94 | { |
| 95 | struct buffer_head *bh; |
| 96 | struct ext4_dir_entry *dirent; |
| 97 | int err = 0, is_dx_block = 0; |
| 98 | |
| 99 | bh = ext4_bread(NULL, inode, block, 0, &err); |
| 100 | if (!bh) { |
| 101 | if (err == 0) { |
| 102 | ext4_error_inode(inode, __func__, line, block, |
| 103 | "Directory hole found"); |
| 104 | return ERR_PTR(-EIO); |
| 105 | } |
| 106 | __ext4_warning(inode->i_sb, __func__, line, |
| 107 | "error reading directory block " |
| 108 | "(ino %lu, block %lu)", inode->i_ino, |
| 109 | (unsigned long) block); |
| 110 | return ERR_PTR(err); |
| 111 | } |
| 112 | dirent = (struct ext4_dir_entry *) bh->b_data; |
| 113 | /* Determine whether or not we have an index block */ |
| 114 | if (is_dx(inode)) { |
| 115 | if (block == 0) |
| 116 | is_dx_block = 1; |
| 117 | else if (ext4_rec_len_from_disk(dirent->rec_len, |
| 118 | inode->i_sb->s_blocksize) == |
| 119 | inode->i_sb->s_blocksize) |
| 120 | is_dx_block = 1; |
| 121 | } |
| 122 | if (!is_dx_block && type == INDEX) { |
| 123 | ext4_error_inode(inode, __func__, line, block, |
| 124 | "directory leaf block found instead of index block"); |
| 125 | return ERR_PTR(-EIO); |
| 126 | } |
| 127 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
| 128 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) || |
| 129 | buffer_verified(bh)) |
| 130 | return bh; |
| 131 | |
| 132 | /* |
| 133 | * An empty leaf block can get mistaken for a index block; for |
| 134 | * this reason, we can only check the index checksum when the |
| 135 | * caller is sure it should be an index block. |
| 136 | */ |
| 137 | if (is_dx_block && type == INDEX) { |
| 138 | if (ext4_dx_csum_verify(inode, dirent)) |
| 139 | set_buffer_verified(bh); |
| 140 | else { |
| 141 | ext4_error_inode(inode, __func__, line, block, |
| 142 | "Directory index failed checksum"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 143 | brelse(bh); |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 144 | return ERR_PTR(-EIO); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 145 | } |
| 146 | } |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 147 | if (!is_dx_block) { |
| 148 | if (ext4_dirent_csum_verify(inode, dirent)) |
| 149 | set_buffer_verified(bh); |
| 150 | else { |
| 151 | ext4_error_inode(inode, __func__, line, block, |
| 152 | "Directory block failed checksum"); |
| 153 | brelse(bh); |
| 154 | return ERR_PTR(-EIO); |
| 155 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 156 | } |
| 157 | return bh; |
| 158 | } |
| 159 | |
| 160 | #ifndef assert |
| 161 | #define assert(test) J_ASSERT(test) |
| 162 | #endif |
| 163 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 164 | #ifdef DX_DEBUG |
| 165 | #define dxtrace(command) command |
| 166 | #else |
| 167 | #define dxtrace(command) |
| 168 | #endif |
| 169 | |
| 170 | struct fake_dirent |
| 171 | { |
| 172 | __le32 inode; |
| 173 | __le16 rec_len; |
| 174 | u8 name_len; |
| 175 | u8 file_type; |
| 176 | }; |
| 177 | |
| 178 | struct dx_countlimit |
| 179 | { |
| 180 | __le16 limit; |
| 181 | __le16 count; |
| 182 | }; |
| 183 | |
| 184 | struct dx_entry |
| 185 | { |
| 186 | __le32 hash; |
| 187 | __le32 block; |
| 188 | }; |
| 189 | |
| 190 | /* |
| 191 | * dx_root_info is laid out so that if it should somehow get overlaid by a |
| 192 | * dirent the two low bits of the hash version will be zero. Therefore, the |
| 193 | * hash version mod 4 should never be 0. Sincerely, the paranoia department. |
| 194 | */ |
| 195 | |
| 196 | struct dx_root |
| 197 | { |
| 198 | struct fake_dirent dot; |
| 199 | char dot_name[4]; |
| 200 | struct fake_dirent dotdot; |
| 201 | char dotdot_name[4]; |
| 202 | struct dx_root_info |
| 203 | { |
| 204 | __le32 reserved_zero; |
| 205 | u8 hash_version; |
| 206 | u8 info_length; /* 8 */ |
| 207 | u8 indirect_levels; |
| 208 | u8 unused_flags; |
| 209 | } |
| 210 | info; |
| 211 | struct dx_entry entries[0]; |
| 212 | }; |
| 213 | |
| 214 | struct dx_node |
| 215 | { |
| 216 | struct fake_dirent fake; |
| 217 | struct dx_entry entries[0]; |
| 218 | }; |
| 219 | |
| 220 | |
| 221 | struct dx_frame |
| 222 | { |
| 223 | struct buffer_head *bh; |
| 224 | struct dx_entry *entries; |
| 225 | struct dx_entry *at; |
| 226 | }; |
| 227 | |
| 228 | struct dx_map_entry |
| 229 | { |
| 230 | u32 hash; |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 231 | u16 offs; |
| 232 | u16 size; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 233 | }; |
| 234 | |
Darrick J. Wong | e615391 | 2012-04-29 18:23:10 -0400 | [diff] [blame] | 235 | /* |
| 236 | * This goes at the end of each htree block. |
| 237 | */ |
| 238 | struct dx_tail { |
| 239 | u32 dt_reserved; |
| 240 | __le32 dt_checksum; /* crc32c(uuid+inum+dirblock) */ |
| 241 | }; |
| 242 | |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 243 | static inline ext4_lblk_t dx_get_block(struct dx_entry *entry); |
| 244 | 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] | 245 | static inline unsigned dx_get_hash(struct dx_entry *entry); |
| 246 | static void dx_set_hash(struct dx_entry *entry, unsigned value); |
| 247 | static unsigned dx_get_count(struct dx_entry *entries); |
| 248 | static unsigned dx_get_limit(struct dx_entry *entries); |
| 249 | static void dx_set_count(struct dx_entry *entries, unsigned value); |
| 250 | static void dx_set_limit(struct dx_entry *entries, unsigned value); |
| 251 | static unsigned dx_root_limit(struct inode *dir, unsigned infosize); |
| 252 | static unsigned dx_node_limit(struct inode *dir); |
Theodore Ts'o | f702ba0 | 2008-09-22 15:21:01 -0400 | [diff] [blame] | 253 | static struct dx_frame *dx_probe(const struct qstr *d_name, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 254 | struct inode *dir, |
| 255 | struct dx_hash_info *hinfo, |
| 256 | struct dx_frame *frame, |
| 257 | int *err); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 258 | static void dx_release(struct dx_frame *frames); |
Theodore Ts'o | 8bad459 | 2009-02-14 21:46:54 -0500 | [diff] [blame] | 259 | static int dx_make_map(struct ext4_dir_entry_2 *de, unsigned blocksize, |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 260 | struct dx_hash_info *hinfo, struct dx_map_entry map[]); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 261 | 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] | 262 | 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] | 263 | struct dx_map_entry *offsets, int count, unsigned blocksize); |
Theodore Ts'o | 8bad459 | 2009-02-14 21:46:54 -0500 | [diff] [blame] | 264 | 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] | 265 | static void dx_insert_block(struct dx_frame *frame, |
| 266 | u32 hash, ext4_lblk_t block); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 267 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 268 | struct dx_frame *frame, |
| 269 | struct dx_frame *frames, |
| 270 | __u32 *start_hash); |
Theodore Ts'o | f702ba0 | 2008-09-22 15:21:01 -0400 | [diff] [blame] | 271 | static struct buffer_head * ext4_dx_find_entry(struct inode *dir, |
| 272 | const struct qstr *d_name, |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame^] | 273 | struct ext4_dir_entry_2 **res_dir); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 274 | static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 275 | struct inode *inode); |
| 276 | |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 277 | /* checksumming functions */ |
Tao Ma | 3c47d54 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 278 | void initialize_dirent_tail(struct ext4_dir_entry_tail *t, |
| 279 | unsigned int blocksize) |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 280 | { |
| 281 | memset(t, 0, sizeof(struct ext4_dir_entry_tail)); |
| 282 | t->det_rec_len = ext4_rec_len_to_disk( |
| 283 | sizeof(struct ext4_dir_entry_tail), blocksize); |
| 284 | t->det_reserved_ft = EXT4_FT_DIR_CSUM; |
| 285 | } |
| 286 | |
| 287 | /* Walk through a dirent block to find a checksum "dirent" at the tail */ |
| 288 | static struct ext4_dir_entry_tail *get_dirent_tail(struct inode *inode, |
| 289 | struct ext4_dir_entry *de) |
| 290 | { |
| 291 | struct ext4_dir_entry_tail *t; |
| 292 | |
| 293 | #ifdef PARANOID |
| 294 | struct ext4_dir_entry *d, *top; |
| 295 | |
| 296 | d = de; |
| 297 | top = (struct ext4_dir_entry *)(((void *)de) + |
| 298 | (EXT4_BLOCK_SIZE(inode->i_sb) - |
| 299 | sizeof(struct ext4_dir_entry_tail))); |
| 300 | while (d < top && d->rec_len) |
| 301 | d = (struct ext4_dir_entry *)(((void *)d) + |
| 302 | le16_to_cpu(d->rec_len)); |
| 303 | |
| 304 | if (d != top) |
| 305 | return NULL; |
| 306 | |
| 307 | t = (struct ext4_dir_entry_tail *)d; |
| 308 | #else |
| 309 | t = EXT4_DIRENT_TAIL(de, EXT4_BLOCK_SIZE(inode->i_sb)); |
| 310 | #endif |
| 311 | |
| 312 | if (t->det_reserved_zero1 || |
| 313 | le16_to_cpu(t->det_rec_len) != sizeof(struct ext4_dir_entry_tail) || |
| 314 | t->det_reserved_zero2 || |
| 315 | t->det_reserved_ft != EXT4_FT_DIR_CSUM) |
| 316 | return NULL; |
| 317 | |
| 318 | return t; |
| 319 | } |
| 320 | |
| 321 | static __le32 ext4_dirent_csum(struct inode *inode, |
| 322 | struct ext4_dir_entry *dirent, int size) |
| 323 | { |
| 324 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 325 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 326 | __u32 csum; |
| 327 | |
| 328 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size); |
| 329 | return cpu_to_le32(csum); |
| 330 | } |
| 331 | |
Theodore Ts'o | dffe9d8 | 2012-11-10 22:20:05 -0500 | [diff] [blame] | 332 | static void warn_no_space_for_csum(struct inode *inode) |
| 333 | { |
| 334 | ext4_warning(inode->i_sb, "no space in directory inode %lu leaf for " |
| 335 | "checksum. Please run e2fsck -D.", inode->i_ino); |
| 336 | } |
| 337 | |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 338 | int ext4_dirent_csum_verify(struct inode *inode, struct ext4_dir_entry *dirent) |
| 339 | { |
| 340 | struct ext4_dir_entry_tail *t; |
| 341 | |
| 342 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
| 343 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 344 | return 1; |
| 345 | |
| 346 | t = get_dirent_tail(inode, dirent); |
| 347 | if (!t) { |
Theodore Ts'o | dffe9d8 | 2012-11-10 22:20:05 -0500 | [diff] [blame] | 348 | warn_no_space_for_csum(inode); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 349 | return 0; |
| 350 | } |
| 351 | |
| 352 | if (t->det_checksum != ext4_dirent_csum(inode, dirent, |
| 353 | (void *)t - (void *)dirent)) |
| 354 | return 0; |
| 355 | |
| 356 | return 1; |
| 357 | } |
| 358 | |
| 359 | static void ext4_dirent_csum_set(struct inode *inode, |
| 360 | struct ext4_dir_entry *dirent) |
| 361 | { |
| 362 | struct ext4_dir_entry_tail *t; |
| 363 | |
| 364 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
| 365 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 366 | return; |
| 367 | |
| 368 | t = get_dirent_tail(inode, dirent); |
| 369 | if (!t) { |
Theodore Ts'o | dffe9d8 | 2012-11-10 22:20:05 -0500 | [diff] [blame] | 370 | warn_no_space_for_csum(inode); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 371 | return; |
| 372 | } |
| 373 | |
| 374 | t->det_checksum = ext4_dirent_csum(inode, dirent, |
| 375 | (void *)t - (void *)dirent); |
| 376 | } |
| 377 | |
Tao Ma | 3c47d54 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 378 | int ext4_handle_dirty_dirent_node(handle_t *handle, |
| 379 | struct inode *inode, |
| 380 | struct buffer_head *bh) |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 381 | { |
| 382 | ext4_dirent_csum_set(inode, (struct ext4_dir_entry *)bh->b_data); |
| 383 | return ext4_handle_dirty_metadata(handle, inode, bh); |
| 384 | } |
| 385 | |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 386 | static struct dx_countlimit *get_dx_countlimit(struct inode *inode, |
| 387 | struct ext4_dir_entry *dirent, |
| 388 | int *offset) |
| 389 | { |
| 390 | struct ext4_dir_entry *dp; |
| 391 | struct dx_root_info *root; |
| 392 | int count_offset; |
| 393 | |
| 394 | if (le16_to_cpu(dirent->rec_len) == EXT4_BLOCK_SIZE(inode->i_sb)) |
| 395 | count_offset = 8; |
| 396 | else if (le16_to_cpu(dirent->rec_len) == 12) { |
| 397 | dp = (struct ext4_dir_entry *)(((void *)dirent) + 12); |
| 398 | if (le16_to_cpu(dp->rec_len) != |
| 399 | EXT4_BLOCK_SIZE(inode->i_sb) - 12) |
| 400 | return NULL; |
| 401 | root = (struct dx_root_info *)(((void *)dp + 12)); |
| 402 | if (root->reserved_zero || |
| 403 | root->info_length != sizeof(struct dx_root_info)) |
| 404 | return NULL; |
| 405 | count_offset = 32; |
| 406 | } else |
| 407 | return NULL; |
| 408 | |
| 409 | if (offset) |
| 410 | *offset = count_offset; |
| 411 | return (struct dx_countlimit *)(((void *)dirent) + count_offset); |
| 412 | } |
| 413 | |
| 414 | static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent, |
| 415 | int count_offset, int count, struct dx_tail *t) |
| 416 | { |
| 417 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 418 | struct ext4_inode_info *ei = EXT4_I(inode); |
Theodore Ts'o | d6a7710 | 2013-04-09 23:59:55 -0400 | [diff] [blame] | 419 | __u32 csum; |
| 420 | __le32 save_csum; |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 421 | int size; |
| 422 | |
| 423 | size = count_offset + (count * sizeof(struct dx_entry)); |
Theodore Ts'o | d6a7710 | 2013-04-09 23:59:55 -0400 | [diff] [blame] | 424 | save_csum = t->dt_checksum; |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 425 | t->dt_checksum = 0; |
| 426 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size); |
| 427 | csum = ext4_chksum(sbi, csum, (__u8 *)t, sizeof(struct dx_tail)); |
Theodore Ts'o | d6a7710 | 2013-04-09 23:59:55 -0400 | [diff] [blame] | 428 | t->dt_checksum = save_csum; |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 429 | |
| 430 | return cpu_to_le32(csum); |
| 431 | } |
| 432 | |
| 433 | static int ext4_dx_csum_verify(struct inode *inode, |
| 434 | struct ext4_dir_entry *dirent) |
| 435 | { |
| 436 | struct dx_countlimit *c; |
| 437 | struct dx_tail *t; |
| 438 | int count_offset, limit, count; |
| 439 | |
| 440 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
| 441 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 442 | return 1; |
| 443 | |
| 444 | c = get_dx_countlimit(inode, dirent, &count_offset); |
| 445 | if (!c) { |
| 446 | EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D."); |
| 447 | return 1; |
| 448 | } |
| 449 | limit = le16_to_cpu(c->limit); |
| 450 | count = le16_to_cpu(c->count); |
| 451 | if (count_offset + (limit * sizeof(struct dx_entry)) > |
| 452 | EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) { |
Theodore Ts'o | dffe9d8 | 2012-11-10 22:20:05 -0500 | [diff] [blame] | 453 | warn_no_space_for_csum(inode); |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 454 | return 1; |
| 455 | } |
| 456 | t = (struct dx_tail *)(((struct dx_entry *)c) + limit); |
| 457 | |
| 458 | if (t->dt_checksum != ext4_dx_csum(inode, dirent, count_offset, |
| 459 | count, t)) |
| 460 | return 0; |
| 461 | return 1; |
| 462 | } |
| 463 | |
| 464 | static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent) |
| 465 | { |
| 466 | struct dx_countlimit *c; |
| 467 | struct dx_tail *t; |
| 468 | int count_offset, limit, count; |
| 469 | |
| 470 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
| 471 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 472 | return; |
| 473 | |
| 474 | c = get_dx_countlimit(inode, dirent, &count_offset); |
| 475 | if (!c) { |
| 476 | EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D."); |
| 477 | return; |
| 478 | } |
| 479 | limit = le16_to_cpu(c->limit); |
| 480 | count = le16_to_cpu(c->count); |
| 481 | if (count_offset + (limit * sizeof(struct dx_entry)) > |
| 482 | EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) { |
Theodore Ts'o | dffe9d8 | 2012-11-10 22:20:05 -0500 | [diff] [blame] | 483 | warn_no_space_for_csum(inode); |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 484 | return; |
| 485 | } |
| 486 | t = (struct dx_tail *)(((struct dx_entry *)c) + limit); |
| 487 | |
| 488 | t->dt_checksum = ext4_dx_csum(inode, dirent, count_offset, count, t); |
| 489 | } |
| 490 | |
| 491 | static inline int ext4_handle_dirty_dx_node(handle_t *handle, |
| 492 | struct inode *inode, |
| 493 | struct buffer_head *bh) |
| 494 | { |
| 495 | ext4_dx_csum_set(inode, (struct ext4_dir_entry *)bh->b_data); |
| 496 | return ext4_handle_dirty_metadata(handle, inode, bh); |
| 497 | } |
| 498 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 499 | /* |
Li Zefan | f795e14 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 500 | * p is at least 6 bytes before the end of page |
| 501 | */ |
| 502 | static inline struct ext4_dir_entry_2 * |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 503 | ext4_next_entry(struct ext4_dir_entry_2 *p, unsigned long blocksize) |
Li Zefan | f795e14 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 504 | { |
| 505 | return (struct ext4_dir_entry_2 *)((char *)p + |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 506 | ext4_rec_len_from_disk(p->rec_len, blocksize)); |
Li Zefan | f795e14 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 510 | * Future: use high four bits of block for coalesce-on-delete flags |
| 511 | * Mask them off for now. |
| 512 | */ |
| 513 | |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 514 | static inline ext4_lblk_t dx_get_block(struct dx_entry *entry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 515 | { |
| 516 | return le32_to_cpu(entry->block) & 0x00ffffff; |
| 517 | } |
| 518 | |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 519 | 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] | 520 | { |
| 521 | entry->block = cpu_to_le32(value); |
| 522 | } |
| 523 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 524 | static inline unsigned dx_get_hash(struct dx_entry *entry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 525 | { |
| 526 | return le32_to_cpu(entry->hash); |
| 527 | } |
| 528 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 529 | static inline void dx_set_hash(struct dx_entry *entry, unsigned value) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 530 | { |
| 531 | entry->hash = cpu_to_le32(value); |
| 532 | } |
| 533 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 534 | static inline unsigned dx_get_count(struct dx_entry *entries) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 535 | { |
| 536 | return le16_to_cpu(((struct dx_countlimit *) entries)->count); |
| 537 | } |
| 538 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 539 | static inline unsigned dx_get_limit(struct dx_entry *entries) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 540 | { |
| 541 | return le16_to_cpu(((struct dx_countlimit *) entries)->limit); |
| 542 | } |
| 543 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 544 | static inline void dx_set_count(struct dx_entry *entries, unsigned value) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 545 | { |
| 546 | ((struct dx_countlimit *) entries)->count = cpu_to_le16(value); |
| 547 | } |
| 548 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 549 | static inline void dx_set_limit(struct dx_entry *entries, unsigned value) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 550 | { |
| 551 | ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value); |
| 552 | } |
| 553 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 554 | static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 555 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 556 | unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) - |
| 557 | EXT4_DIR_REC_LEN(2) - infosize; |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 558 | |
| 559 | if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb, |
| 560 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 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 | |
| 569 | if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb, |
| 570 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 571 | entry_space -= sizeof(struct dx_tail); |
Li Zefan | d9c769b | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 572 | return entry_space / sizeof(struct dx_entry); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | /* |
| 576 | * Debug |
| 577 | */ |
| 578 | #ifdef DX_DEBUG |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 579 | static void dx_show_index(char * label, struct dx_entry *entries) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 580 | { |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 581 | int i, n = dx_get_count (entries); |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 582 | printk(KERN_DEBUG "%s index ", label); |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 583 | for (i = 0; i < n; i++) { |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 584 | printk("%x->%lu ", i ? dx_get_hash(entries + i) : |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 585 | 0, (unsigned long)dx_get_block(entries + i)); |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 586 | } |
| 587 | printk("\n"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | struct stats |
| 591 | { |
| 592 | unsigned names; |
| 593 | unsigned space; |
| 594 | unsigned bcount; |
| 595 | }; |
| 596 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 597 | static struct stats dx_show_leaf(struct dx_hash_info *hinfo, struct ext4_dir_entry_2 *de, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 598 | int size, int show_names) |
| 599 | { |
| 600 | unsigned names = 0, space = 0; |
| 601 | char *base = (char *) de; |
| 602 | struct dx_hash_info h = *hinfo; |
| 603 | |
| 604 | printk("names: "); |
| 605 | while ((char *) de < base + size) |
| 606 | { |
| 607 | if (de->inode) |
| 608 | { |
| 609 | if (show_names) |
| 610 | { |
| 611 | int len = de->name_len; |
| 612 | char *name = de->name; |
| 613 | while (len--) printk("%c", *name++); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 614 | ext4fs_dirhash(de->name, de->name_len, &h); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 615 | printk(":%x.%u ", h.hash, |
Bernd Schubert | 265c6a0 | 2011-07-16 19:41:23 -0400 | [diff] [blame] | 616 | (unsigned) ((char *) de - base)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 617 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 618 | space += EXT4_DIR_REC_LEN(de->name_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 619 | names++; |
| 620 | } |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 621 | de = ext4_next_entry(de, size); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 622 | } |
| 623 | printk("(%i)\n", names); |
| 624 | return (struct stats) { names, space, 1 }; |
| 625 | } |
| 626 | |
| 627 | struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir, |
| 628 | struct dx_entry *entries, int levels) |
| 629 | { |
| 630 | unsigned blocksize = dir->i_sb->s_blocksize; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 631 | unsigned count = dx_get_count(entries), names = 0, space = 0, i; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 632 | unsigned bcount = 0; |
| 633 | struct buffer_head *bh; |
| 634 | int err; |
| 635 | printk("%i indexed blocks...\n", count); |
| 636 | for (i = 0; i < count; i++, entries++) |
| 637 | { |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 638 | ext4_lblk_t block = dx_get_block(entries); |
| 639 | ext4_lblk_t hash = i ? dx_get_hash(entries): 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 640 | u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash; |
| 641 | struct stats stats; |
| 642 | printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 643 | if (!(bh = ext4_bread (NULL,dir, block, 0,&err))) continue; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 644 | stats = levels? |
| 645 | dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1): |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 646 | dx_show_leaf(hinfo, (struct ext4_dir_entry_2 *) bh->b_data, blocksize, 0); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 647 | names += stats.names; |
| 648 | space += stats.space; |
| 649 | bcount += stats.bcount; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 650 | brelse(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 651 | } |
| 652 | if (bcount) |
Theodore Ts'o | 60e6679 | 2010-05-17 07:00:00 -0400 | [diff] [blame] | 653 | printk(KERN_DEBUG "%snames %u, fullness %u (%u%%)\n", |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 654 | levels ? "" : " ", names, space/bcount, |
| 655 | (space/bcount)*100/blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 656 | return (struct stats) { names, space, bcount}; |
| 657 | } |
| 658 | #endif /* DX_DEBUG */ |
| 659 | |
| 660 | /* |
| 661 | * Probe for a directory leaf block to search. |
| 662 | * |
| 663 | * dx_probe can return ERR_BAD_DX_DIR, which means there was a format |
| 664 | * error in the directory index, and the caller should fall back to |
| 665 | * searching the directory normally. The callers of dx_probe **MUST** |
| 666 | * check for this error code, and make sure it never gets reflected |
| 667 | * back to userspace. |
| 668 | */ |
| 669 | static struct dx_frame * |
Theodore Ts'o | f702ba0 | 2008-09-22 15:21:01 -0400 | [diff] [blame] | 670 | dx_probe(const struct qstr *d_name, struct inode *dir, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 671 | struct dx_hash_info *hinfo, struct dx_frame *frame_in, int *err) |
| 672 | { |
| 673 | unsigned count, indirect; |
| 674 | struct dx_entry *at, *entries, *p, *q, *m; |
| 675 | struct dx_root *root; |
| 676 | struct buffer_head *bh; |
| 677 | struct dx_frame *frame = frame_in; |
| 678 | u32 hash; |
| 679 | |
| 680 | frame->bh = NULL; |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 681 | bh = ext4_read_dirblock(dir, 0, INDEX); |
| 682 | if (IS_ERR(bh)) { |
| 683 | *err = PTR_ERR(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 684 | goto fail; |
Carlos Maiolino | 6d1ab10 | 2012-09-27 09:31:33 -0400 | [diff] [blame] | 685 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 686 | root = (struct dx_root *) bh->b_data; |
| 687 | if (root->info.hash_version != DX_HASH_TEA && |
| 688 | root->info.hash_version != DX_HASH_HALF_MD4 && |
| 689 | root->info.hash_version != DX_HASH_LEGACY) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 690 | ext4_warning(dir->i_sb, "Unrecognised inode hash code %d", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 691 | root->info.hash_version); |
| 692 | brelse(bh); |
| 693 | *err = ERR_BAD_DX_DIR; |
| 694 | goto fail; |
| 695 | } |
| 696 | hinfo->hash_version = root->info.hash_version; |
Theodore Ts'o | f99b258 | 2008-10-28 13:21:44 -0400 | [diff] [blame] | 697 | if (hinfo->hash_version <= DX_HASH_TEA) |
| 698 | hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 699 | hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
Theodore Ts'o | f702ba0 | 2008-09-22 15:21:01 -0400 | [diff] [blame] | 700 | if (d_name) |
| 701 | ext4fs_dirhash(d_name->name, d_name->len, hinfo); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 702 | hash = hinfo->hash; |
| 703 | |
| 704 | if (root->info.unused_flags & 1) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 705 | ext4_warning(dir->i_sb, "Unimplemented inode hash flags: %#06x", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 706 | root->info.unused_flags); |
| 707 | brelse(bh); |
| 708 | *err = ERR_BAD_DX_DIR; |
| 709 | goto fail; |
| 710 | } |
| 711 | |
| 712 | if ((indirect = root->info.indirect_levels) > 1) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 713 | ext4_warning(dir->i_sb, "Unimplemented inode hash depth: %#06x", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 714 | root->info.indirect_levels); |
| 715 | brelse(bh); |
| 716 | *err = ERR_BAD_DX_DIR; |
| 717 | goto fail; |
| 718 | } |
| 719 | |
| 720 | entries = (struct dx_entry *) (((char *)&root->info) + |
| 721 | root->info.info_length); |
Eric Sandeen | 3d82aba | 2007-09-18 22:46:38 -0700 | [diff] [blame] | 722 | |
| 723 | if (dx_get_limit(entries) != dx_root_limit(dir, |
| 724 | root->info.info_length)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 725 | ext4_warning(dir->i_sb, "dx entry: limit != root limit"); |
Eric Sandeen | 3d82aba | 2007-09-18 22:46:38 -0700 | [diff] [blame] | 726 | brelse(bh); |
| 727 | *err = ERR_BAD_DX_DIR; |
| 728 | goto fail; |
| 729 | } |
| 730 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 731 | dxtrace(printk("Look up %x", hash)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 732 | while (1) |
| 733 | { |
| 734 | count = dx_get_count(entries); |
Eric Sandeen | 3d82aba | 2007-09-18 22:46:38 -0700 | [diff] [blame] | 735 | if (!count || count > dx_get_limit(entries)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 736 | ext4_warning(dir->i_sb, |
Eric Sandeen | 3d82aba | 2007-09-18 22:46:38 -0700 | [diff] [blame] | 737 | "dx entry: no count or count > limit"); |
| 738 | brelse(bh); |
| 739 | *err = ERR_BAD_DX_DIR; |
| 740 | goto fail2; |
| 741 | } |
| 742 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 743 | p = entries + 1; |
| 744 | q = entries + count - 1; |
| 745 | while (p <= q) |
| 746 | { |
| 747 | m = p + (q - p)/2; |
| 748 | dxtrace(printk(".")); |
| 749 | if (dx_get_hash(m) > hash) |
| 750 | q = m - 1; |
| 751 | else |
| 752 | p = m + 1; |
| 753 | } |
| 754 | |
| 755 | if (0) // linear search cross check |
| 756 | { |
| 757 | unsigned n = count - 1; |
| 758 | at = entries; |
| 759 | while (n--) |
| 760 | { |
| 761 | dxtrace(printk(",")); |
| 762 | if (dx_get_hash(++at) > hash) |
| 763 | { |
| 764 | at--; |
| 765 | break; |
| 766 | } |
| 767 | } |
| 768 | assert (at == p - 1); |
| 769 | } |
| 770 | |
| 771 | at = p - 1; |
| 772 | dxtrace(printk(" %x->%u\n", at == entries? 0: dx_get_hash(at), dx_get_block(at))); |
| 773 | frame->bh = bh; |
| 774 | frame->entries = entries; |
| 775 | frame->at = at; |
| 776 | if (!indirect--) return frame; |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 777 | bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX); |
| 778 | if (IS_ERR(bh)) { |
| 779 | *err = PTR_ERR(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 780 | goto fail2; |
Carlos Maiolino | 6d1ab10 | 2012-09-27 09:31:33 -0400 | [diff] [blame] | 781 | } |
Guo Chao | 41be871 | 2013-01-28 21:33:28 -0500 | [diff] [blame] | 782 | entries = ((struct dx_node *) bh->b_data)->entries; |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 783 | |
Eric Sandeen | 3d82aba | 2007-09-18 22:46:38 -0700 | [diff] [blame] | 784 | if (dx_get_limit(entries) != dx_node_limit (dir)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 785 | ext4_warning(dir->i_sb, |
Eric Sandeen | 3d82aba | 2007-09-18 22:46:38 -0700 | [diff] [blame] | 786 | "dx entry: limit != node limit"); |
| 787 | brelse(bh); |
| 788 | *err = ERR_BAD_DX_DIR; |
| 789 | goto fail2; |
| 790 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 791 | frame++; |
Eric Sandeen | 3d82aba | 2007-09-18 22:46:38 -0700 | [diff] [blame] | 792 | frame->bh = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 793 | } |
| 794 | fail2: |
| 795 | while (frame >= frame_in) { |
| 796 | brelse(frame->bh); |
| 797 | frame--; |
| 798 | } |
| 799 | fail: |
Eric Sandeen | 3d82aba | 2007-09-18 22:46:38 -0700 | [diff] [blame] | 800 | if (*err == ERR_BAD_DX_DIR) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 801 | ext4_warning(dir->i_sb, |
Zheng Liu | 9ee4930 | 2012-02-20 23:09:36 -0500 | [diff] [blame] | 802 | "Corrupt dir inode %lu, running e2fsck is " |
Eric Sandeen | 3d82aba | 2007-09-18 22:46:38 -0700 | [diff] [blame] | 803 | "recommended.", dir->i_ino); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 804 | return NULL; |
| 805 | } |
| 806 | |
| 807 | static void dx_release (struct dx_frame *frames) |
| 808 | { |
| 809 | if (frames[0].bh == NULL) |
| 810 | return; |
| 811 | |
| 812 | if (((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels) |
| 813 | brelse(frames[1].bh); |
| 814 | brelse(frames[0].bh); |
| 815 | } |
| 816 | |
| 817 | /* |
| 818 | * This function increments the frame pointer to search the next leaf |
| 819 | * block, and reads in the necessary intervening nodes if the search |
| 820 | * should be necessary. Whether or not the search is necessary is |
| 821 | * controlled by the hash parameter. If the hash value is even, then |
| 822 | * the search is only continued if the next block starts with that |
| 823 | * hash value. This is used if we are searching for a specific file. |
| 824 | * |
| 825 | * If the hash value is HASH_NB_ALWAYS, then always go to the next block. |
| 826 | * |
| 827 | * This function returns 1 if the caller should continue to search, |
| 828 | * or 0 if it should not. If there is an error reading one of the |
| 829 | * index blocks, it will a negative error code. |
| 830 | * |
| 831 | * If start_hash is non-null, it will be filled in with the starting |
| 832 | * hash of the next page. |
| 833 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 834 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 835 | struct dx_frame *frame, |
| 836 | struct dx_frame *frames, |
| 837 | __u32 *start_hash) |
| 838 | { |
| 839 | struct dx_frame *p; |
| 840 | struct buffer_head *bh; |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 841 | int num_frames = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 842 | __u32 bhash; |
| 843 | |
| 844 | p = frame; |
| 845 | /* |
| 846 | * Find the next leaf page by incrementing the frame pointer. |
| 847 | * If we run out of entries in the interior node, loop around and |
| 848 | * increment pointer in the parent node. When we break out of |
| 849 | * this loop, num_frames indicates the number of interior |
| 850 | * nodes need to be read. |
| 851 | */ |
| 852 | while (1) { |
| 853 | if (++(p->at) < p->entries + dx_get_count(p->entries)) |
| 854 | break; |
| 855 | if (p == frames) |
| 856 | return 0; |
| 857 | num_frames++; |
| 858 | p--; |
| 859 | } |
| 860 | |
| 861 | /* |
| 862 | * If the hash is 1, then continue only if the next page has a |
| 863 | * continuation hash of any value. This is used for readdir |
| 864 | * handling. Otherwise, check to see if the hash matches the |
| 865 | * desired contiuation hash. If it doesn't, return since |
| 866 | * there's no point to read in the successive index pages. |
| 867 | */ |
| 868 | bhash = dx_get_hash(p->at); |
| 869 | if (start_hash) |
| 870 | *start_hash = bhash; |
| 871 | if ((hash & 1) == 0) { |
| 872 | if ((bhash & ~1) != hash) |
| 873 | return 0; |
| 874 | } |
| 875 | /* |
| 876 | * If the hash is HASH_NB_ALWAYS, we always go to the next |
| 877 | * block so no check is necessary |
| 878 | */ |
| 879 | while (num_frames--) { |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 880 | bh = ext4_read_dirblock(dir, dx_get_block(p->at), INDEX); |
| 881 | if (IS_ERR(bh)) |
| 882 | return PTR_ERR(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 883 | p++; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 884 | brelse(p->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 885 | p->bh = bh; |
| 886 | p->at = p->entries = ((struct dx_node *) bh->b_data)->entries; |
| 887 | } |
| 888 | return 1; |
| 889 | } |
| 890 | |
| 891 | |
| 892 | /* |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 893 | * This function fills a red-black tree with information from a |
| 894 | * directory block. It returns the number directory entries loaded |
| 895 | * into the tree. If there is an error it is returned in err. |
| 896 | */ |
| 897 | static int htree_dirblock_to_tree(struct file *dir_file, |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 898 | struct inode *dir, ext4_lblk_t block, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 899 | struct dx_hash_info *hinfo, |
| 900 | __u32 start_hash, __u32 start_minor_hash) |
| 901 | { |
| 902 | struct buffer_head *bh; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 903 | struct ext4_dir_entry_2 *de, *top; |
Carlos Maiolino | 90b0a97 | 2012-09-17 23:39:12 -0400 | [diff] [blame] | 904 | int err = 0, count = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 905 | |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 906 | dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n", |
| 907 | (unsigned long)block)); |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 908 | bh = ext4_read_dirblock(dir, block, DIRENT); |
| 909 | if (IS_ERR(bh)) |
| 910 | return PTR_ERR(bh); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 911 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 912 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
| 913 | top = (struct ext4_dir_entry_2 *) ((char *) de + |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 914 | dir->i_sb->s_blocksize - |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 915 | EXT4_DIR_REC_LEN(0)); |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 916 | 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] | 917 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
Tao Ma | 226ba97 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 918 | bh->b_data, bh->b_size, |
Theodore Ts'o | cad3f00 | 2010-12-19 22:07:02 -0500 | [diff] [blame] | 919 | (block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb)) |
| 920 | + ((char *)de - bh->b_data))) { |
Al Viro | 64cb927 | 2013-07-01 08:12:38 -0400 | [diff] [blame] | 921 | /* silently ignore the rest of the block */ |
| 922 | break; |
Eric Sandeen | e6c4021 | 2006-12-06 20:36:28 -0800 | [diff] [blame] | 923 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 924 | ext4fs_dirhash(de->name, de->name_len, hinfo); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 925 | if ((hinfo->hash < start_hash) || |
| 926 | ((hinfo->hash == start_hash) && |
| 927 | (hinfo->minor_hash < start_minor_hash))) |
| 928 | continue; |
| 929 | if (de->inode == 0) |
| 930 | continue; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 931 | if ((err = ext4_htree_store_dirent(dir_file, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 932 | hinfo->hash, hinfo->minor_hash, de)) != 0) { |
| 933 | brelse(bh); |
| 934 | return err; |
| 935 | } |
| 936 | count++; |
| 937 | } |
| 938 | brelse(bh); |
| 939 | return count; |
| 940 | } |
| 941 | |
| 942 | |
| 943 | /* |
| 944 | * This function fills a red-black tree with information from a |
| 945 | * directory. We start scanning the directory in hash order, starting |
| 946 | * at start_hash and start_minor_hash. |
| 947 | * |
| 948 | * This function returns the number of entries inserted into the tree, |
| 949 | * or a negative error code. |
| 950 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 951 | int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 952 | __u32 start_minor_hash, __u32 *next_hash) |
| 953 | { |
| 954 | struct dx_hash_info hinfo; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 955 | struct ext4_dir_entry_2 *de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 956 | struct dx_frame frames[2], *frame; |
| 957 | struct inode *dir; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 958 | ext4_lblk_t block; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 959 | int count = 0; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 960 | int ret, err; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 961 | __u32 hashval; |
| 962 | |
Theodore Ts'o | 60e6679 | 2010-05-17 07:00:00 -0400 | [diff] [blame] | 963 | 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] | 964 | start_hash, start_minor_hash)); |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 965 | dir = file_inode(dir_file); |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 966 | if (!(ext4_test_inode_flag(dir, EXT4_INODE_INDEX))) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 967 | 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] | 968 | if (hinfo.hash_version <= DX_HASH_TEA) |
| 969 | hinfo.hash_version += |
| 970 | EXT4_SB(dir->i_sb)->s_hash_unsigned; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 971 | hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
Tao Ma | 8af0f08 | 2013-04-19 17:53:09 -0400 | [diff] [blame] | 972 | if (ext4_has_inline_data(dir)) { |
| 973 | int has_inline_data = 1; |
| 974 | count = htree_inlinedir_to_tree(dir_file, dir, 0, |
| 975 | &hinfo, start_hash, |
| 976 | start_minor_hash, |
| 977 | &has_inline_data); |
| 978 | if (has_inline_data) { |
| 979 | *next_hash = ~0; |
| 980 | return count; |
| 981 | } |
| 982 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 983 | count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo, |
| 984 | start_hash, start_minor_hash); |
| 985 | *next_hash = ~0; |
| 986 | return count; |
| 987 | } |
| 988 | hinfo.hash = start_hash; |
| 989 | hinfo.minor_hash = 0; |
Theodore Ts'o | f702ba0 | 2008-09-22 15:21:01 -0400 | [diff] [blame] | 990 | frame = dx_probe(NULL, dir, &hinfo, frames, &err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 991 | if (!frame) |
| 992 | return err; |
| 993 | |
| 994 | /* Add '.' and '..' from the htree header */ |
| 995 | if (!start_hash && !start_minor_hash) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 996 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
| 997 | if ((err = ext4_htree_store_dirent(dir_file, 0, 0, de)) != 0) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 998 | goto errout; |
| 999 | count++; |
| 1000 | } |
| 1001 | if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1002 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1003 | de = ext4_next_entry(de, dir->i_sb->s_blocksize); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1004 | if ((err = ext4_htree_store_dirent(dir_file, 2, 0, de)) != 0) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1005 | goto errout; |
| 1006 | count++; |
| 1007 | } |
| 1008 | |
| 1009 | while (1) { |
| 1010 | block = dx_get_block(frame->at); |
| 1011 | ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo, |
| 1012 | start_hash, start_minor_hash); |
| 1013 | if (ret < 0) { |
| 1014 | err = ret; |
| 1015 | goto errout; |
| 1016 | } |
| 1017 | count += ret; |
| 1018 | hashval = ~0; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1019 | ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1020 | frame, frames, &hashval); |
| 1021 | *next_hash = hashval; |
| 1022 | if (ret < 0) { |
| 1023 | err = ret; |
| 1024 | goto errout; |
| 1025 | } |
| 1026 | /* |
| 1027 | * Stop if: (a) there are no more entries, or |
| 1028 | * (b) we have inserted at least one entry and the |
| 1029 | * next hash value is not a continuation |
| 1030 | */ |
| 1031 | if ((ret == 0) || |
| 1032 | (count && ((hashval & 1) == 0))) |
| 1033 | break; |
| 1034 | } |
| 1035 | dx_release(frames); |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 1036 | dxtrace(printk(KERN_DEBUG "Fill tree: returned %d entries, " |
| 1037 | "next hash: %x\n", count, *next_hash)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1038 | return count; |
| 1039 | errout: |
| 1040 | dx_release(frames); |
| 1041 | return (err); |
| 1042 | } |
| 1043 | |
Tao Ma | 7335cd3 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 1044 | static inline int search_dirblock(struct buffer_head *bh, |
| 1045 | struct inode *dir, |
| 1046 | const struct qstr *d_name, |
| 1047 | unsigned int offset, |
| 1048 | struct ext4_dir_entry_2 **res_dir) |
| 1049 | { |
| 1050 | return search_dir(bh, bh->b_data, dir->i_sb->s_blocksize, dir, |
| 1051 | d_name, offset, res_dir); |
| 1052 | } |
| 1053 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1054 | /* |
| 1055 | * Directory block splitting, compacting |
| 1056 | */ |
| 1057 | |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 1058 | /* |
| 1059 | * Create map of hash values, offsets, and sizes, stored at end of block. |
| 1060 | * Returns number of entries mapped. |
| 1061 | */ |
Theodore Ts'o | 8bad459 | 2009-02-14 21:46:54 -0500 | [diff] [blame] | 1062 | static int dx_make_map(struct ext4_dir_entry_2 *de, unsigned blocksize, |
| 1063 | struct dx_hash_info *hinfo, |
| 1064 | struct dx_map_entry *map_tail) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1065 | { |
| 1066 | int count = 0; |
| 1067 | char *base = (char *) de; |
| 1068 | struct dx_hash_info h = *hinfo; |
| 1069 | |
Theodore Ts'o | 8bad459 | 2009-02-14 21:46:54 -0500 | [diff] [blame] | 1070 | while ((char *) de < base + blocksize) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1071 | if (de->name_len && de->inode) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1072 | ext4fs_dirhash(de->name, de->name_len, &h); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1073 | map_tail--; |
| 1074 | map_tail->hash = h.hash; |
Toshiyuki Okajima | 9aee228 | 2009-06-08 12:41:35 -0400 | [diff] [blame] | 1075 | map_tail->offs = ((char *) de - base)>>2; |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 1076 | map_tail->size = le16_to_cpu(de->rec_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1077 | count++; |
| 1078 | cond_resched(); |
| 1079 | } |
| 1080 | /* XXX: do we need to check rec_len == 0 case? -Chris */ |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1081 | de = ext4_next_entry(de, blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1082 | } |
| 1083 | return count; |
| 1084 | } |
| 1085 | |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 1086 | /* Sort map by hash value */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1087 | static void dx_sort_map (struct dx_map_entry *map, unsigned count) |
| 1088 | { |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 1089 | struct dx_map_entry *p, *q, *top = map + count - 1; |
| 1090 | int more; |
| 1091 | /* Combsort until bubble sort doesn't suck */ |
| 1092 | while (count > 2) { |
| 1093 | count = count*10/13; |
| 1094 | if (count - 9 < 2) /* 9, 10 -> 11 */ |
| 1095 | count = 11; |
| 1096 | for (p = top, q = p - count; q >= map; p--, q--) |
| 1097 | if (p->hash < q->hash) |
| 1098 | swap(*p, *q); |
| 1099 | } |
| 1100 | /* Garden variety bubble sort */ |
| 1101 | do { |
| 1102 | more = 0; |
| 1103 | q = top; |
| 1104 | while (q-- > map) { |
| 1105 | if (q[1].hash >= q[0].hash) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1106 | continue; |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 1107 | swap(*(q+1), *q); |
| 1108 | more = 1; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1109 | } |
| 1110 | } while(more); |
| 1111 | } |
| 1112 | |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1113 | 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] | 1114 | { |
| 1115 | struct dx_entry *entries = frame->entries; |
| 1116 | struct dx_entry *old = frame->at, *new = old + 1; |
| 1117 | int count = dx_get_count(entries); |
| 1118 | |
| 1119 | assert(count < dx_get_limit(entries)); |
| 1120 | assert(old < entries + count); |
| 1121 | memmove(new + 1, new, (char *)(entries + count) - (char *)(new)); |
| 1122 | dx_set_hash(new, hash); |
| 1123 | dx_set_block(new, block); |
| 1124 | dx_set_count(entries, count + 1); |
| 1125 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1126 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1127 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1128 | * NOTE! unlike strncmp, ext4_match returns 1 for success, 0 for failure. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1129 | * |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1130 | * `len <= EXT4_NAME_LEN' is guaranteed by caller. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1131 | * `de != NULL' is guaranteed by caller. |
| 1132 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1133 | static inline int ext4_match (int len, const char * const name, |
| 1134 | struct ext4_dir_entry_2 * de) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1135 | { |
| 1136 | if (len != de->name_len) |
| 1137 | return 0; |
| 1138 | if (!de->inode) |
| 1139 | return 0; |
| 1140 | return !memcmp(name, de->name, len); |
| 1141 | } |
| 1142 | |
| 1143 | /* |
| 1144 | * Returns 0 if not found, -1 on failure, and 1 on success |
| 1145 | */ |
Tao Ma | 7335cd3 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 1146 | int search_dir(struct buffer_head *bh, |
| 1147 | char *search_buf, |
| 1148 | int buf_size, |
| 1149 | struct inode *dir, |
| 1150 | const struct qstr *d_name, |
| 1151 | unsigned int offset, |
| 1152 | struct ext4_dir_entry_2 **res_dir) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1153 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1154 | struct ext4_dir_entry_2 * de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1155 | char * dlimit; |
| 1156 | int de_len; |
Theodore Ts'o | f702ba0 | 2008-09-22 15:21:01 -0400 | [diff] [blame] | 1157 | const char *name = d_name->name; |
| 1158 | int namelen = d_name->len; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1159 | |
Tao Ma | 7335cd3 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 1160 | de = (struct ext4_dir_entry_2 *)search_buf; |
| 1161 | dlimit = search_buf + buf_size; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1162 | while ((char *) de < dlimit) { |
| 1163 | /* this code is executed quadratically often */ |
| 1164 | /* do minimal checking `by hand' */ |
| 1165 | |
| 1166 | if ((char *) de + namelen <= dlimit && |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1167 | ext4_match (namelen, name, de)) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1168 | /* found a match - just to be sure, do a full check */ |
Tao Ma | 226ba97 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1169 | if (ext4_check_dir_entry(dir, NULL, de, bh, bh->b_data, |
| 1170 | bh->b_size, offset)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1171 | return -1; |
| 1172 | *res_dir = de; |
| 1173 | return 1; |
| 1174 | } |
| 1175 | /* prevent looping on a bad block */ |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1176 | de_len = ext4_rec_len_from_disk(de->rec_len, |
| 1177 | dir->i_sb->s_blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1178 | if (de_len <= 0) |
| 1179 | return -1; |
| 1180 | offset += de_len; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1181 | de = (struct ext4_dir_entry_2 *) ((char *) de + de_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1182 | } |
| 1183 | return 0; |
| 1184 | } |
| 1185 | |
Darrick J. Wong | c6af880 | 2012-11-12 23:51:02 -0500 | [diff] [blame] | 1186 | static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block, |
| 1187 | struct ext4_dir_entry *de) |
| 1188 | { |
| 1189 | struct super_block *sb = dir->i_sb; |
| 1190 | |
| 1191 | if (!is_dx(dir)) |
| 1192 | return 0; |
| 1193 | if (block == 0) |
| 1194 | return 1; |
| 1195 | if (de->inode == 0 && |
| 1196 | ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) == |
| 1197 | sb->s_blocksize) |
| 1198 | return 1; |
| 1199 | return 0; |
| 1200 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1201 | |
| 1202 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1203 | * ext4_find_entry() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1204 | * |
| 1205 | * finds an entry in the specified directory with the wanted name. It |
| 1206 | * returns the cache buffer in which the entry was found, and the entry |
| 1207 | * itself (as a parameter - res_dir). It does NOT read the inode of the |
| 1208 | * entry - you'll have to do that yourself if you want to. |
| 1209 | * |
| 1210 | * The returned buffer_head has ->b_count elevated. The caller is expected |
| 1211 | * to brelse() it when appropriate. |
| 1212 | */ |
Theodore Ts'o | f702ba0 | 2008-09-22 15:21:01 -0400 | [diff] [blame] | 1213 | static struct buffer_head * ext4_find_entry (struct inode *dir, |
| 1214 | const struct qstr *d_name, |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 1215 | struct ext4_dir_entry_2 **res_dir, |
| 1216 | int *inlined) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1217 | { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1218 | struct super_block *sb; |
| 1219 | struct buffer_head *bh_use[NAMEI_RA_SIZE]; |
| 1220 | struct buffer_head *bh, *ret = NULL; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1221 | ext4_lblk_t start, block, b; |
Theodore Ts'o | 8941ec8 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1222 | const u8 *name = d_name->name; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1223 | int ra_max = 0; /* Number of bh's in the readahead |
| 1224 | buffer, bh_use[] */ |
| 1225 | int ra_ptr = 0; /* Current index into readahead |
| 1226 | buffer */ |
| 1227 | int num = 0; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1228 | ext4_lblk_t nblocks; |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 1229 | int i, err = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1230 | int namelen; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1231 | |
| 1232 | *res_dir = NULL; |
| 1233 | sb = dir->i_sb; |
Theodore Ts'o | f702ba0 | 2008-09-22 15:21:01 -0400 | [diff] [blame] | 1234 | namelen = d_name->len; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1235 | if (namelen > EXT4_NAME_LEN) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1236 | return NULL; |
Tao Ma | e8e948e | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 1237 | |
| 1238 | if (ext4_has_inline_data(dir)) { |
| 1239 | int has_inline_data = 1; |
| 1240 | ret = ext4_find_inline_entry(dir, d_name, res_dir, |
| 1241 | &has_inline_data); |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 1242 | if (has_inline_data) { |
| 1243 | if (inlined) |
| 1244 | *inlined = 1; |
Tao Ma | e8e948e | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 1245 | return ret; |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 1246 | } |
Tao Ma | e8e948e | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 1247 | } |
| 1248 | |
Theodore Ts'o | 8941ec8 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1249 | if ((namelen <= 2) && (name[0] == '.') && |
Aaro Koskinen | 6d5c3aa | 2010-12-14 21:45:31 -0500 | [diff] [blame] | 1250 | (name[1] == '.' || name[1] == '\0')) { |
Theodore Ts'o | 8941ec8 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1251 | /* |
| 1252 | * "." or ".." will only be in the first block |
| 1253 | * NFS may look up ".."; "." should be handled by the VFS |
| 1254 | */ |
| 1255 | block = start = 0; |
| 1256 | nblocks = 1; |
| 1257 | goto restart; |
| 1258 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1259 | if (is_dx(dir)) { |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame^] | 1260 | bh = ext4_dx_find_entry(dir, d_name, res_dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1261 | /* |
| 1262 | * On success, or if the error was file not found, |
| 1263 | * return. Otherwise, fall back to doing a search the |
| 1264 | * old fashioned way. |
| 1265 | */ |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame^] | 1266 | if (!IS_ERR(bh) || PTR_ERR(bh) != ERR_BAD_DX_DIR) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1267 | return bh; |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 1268 | dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, " |
| 1269 | "falling back\n")); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1270 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1271 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
| 1272 | start = EXT4_I(dir)->i_dir_start_lookup; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1273 | if (start >= nblocks) |
| 1274 | start = 0; |
| 1275 | block = start; |
| 1276 | restart: |
| 1277 | do { |
| 1278 | /* |
| 1279 | * We deal with the read-ahead logic here. |
| 1280 | */ |
| 1281 | if (ra_ptr >= ra_max) { |
| 1282 | /* Refill the readahead buffer */ |
| 1283 | ra_ptr = 0; |
| 1284 | b = block; |
| 1285 | for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) { |
| 1286 | /* |
| 1287 | * Terminate if we reach the end of the |
| 1288 | * directory and must wrap, or if our |
| 1289 | * search has finished at this block. |
| 1290 | */ |
| 1291 | if (b >= nblocks || (num && block == start)) { |
| 1292 | bh_use[ra_max] = NULL; |
| 1293 | break; |
| 1294 | } |
| 1295 | num++; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1296 | bh = ext4_getblk(NULL, dir, b++, 0, &err); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 1297 | if (unlikely(err)) { |
| 1298 | if (ra_max == 0) |
| 1299 | return ERR_PTR(err); |
| 1300 | break; |
| 1301 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1302 | bh_use[ra_max] = bh; |
| 1303 | if (bh) |
Christoph Hellwig | 65299a3 | 2011-08-23 14:50:29 +0200 | [diff] [blame] | 1304 | ll_rw_block(READ | REQ_META | REQ_PRIO, |
| 1305 | 1, &bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1306 | } |
| 1307 | } |
| 1308 | if ((bh = bh_use[ra_ptr++]) == NULL) |
| 1309 | goto next; |
| 1310 | wait_on_buffer(bh); |
| 1311 | if (!buffer_uptodate(bh)) { |
| 1312 | /* read error, skip block & hope for the best */ |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 1313 | EXT4_ERROR_INODE(dir, "reading directory lblock %lu", |
| 1314 | (unsigned long) block); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1315 | brelse(bh); |
| 1316 | goto next; |
| 1317 | } |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1318 | if (!buffer_verified(bh) && |
Darrick J. Wong | c6af880 | 2012-11-12 23:51:02 -0500 | [diff] [blame] | 1319 | !is_dx_internal_node(dir, block, |
| 1320 | (struct ext4_dir_entry *)bh->b_data) && |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1321 | !ext4_dirent_csum_verify(dir, |
| 1322 | (struct ext4_dir_entry *)bh->b_data)) { |
| 1323 | EXT4_ERROR_INODE(dir, "checksumming directory " |
| 1324 | "block %lu", (unsigned long)block); |
| 1325 | brelse(bh); |
| 1326 | goto next; |
| 1327 | } |
| 1328 | set_buffer_verified(bh); |
Theodore Ts'o | f702ba0 | 2008-09-22 15:21:01 -0400 | [diff] [blame] | 1329 | i = search_dirblock(bh, dir, d_name, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1330 | block << EXT4_BLOCK_SIZE_BITS(sb), res_dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1331 | if (i == 1) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1332 | EXT4_I(dir)->i_dir_start_lookup = block; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1333 | ret = bh; |
| 1334 | goto cleanup_and_exit; |
| 1335 | } else { |
| 1336 | brelse(bh); |
| 1337 | if (i < 0) |
| 1338 | goto cleanup_and_exit; |
| 1339 | } |
| 1340 | next: |
| 1341 | if (++block >= nblocks) |
| 1342 | block = 0; |
| 1343 | } while (block != start); |
| 1344 | |
| 1345 | /* |
| 1346 | * If the directory has grown while we were searching, then |
| 1347 | * search the last part of the directory before giving up. |
| 1348 | */ |
| 1349 | block = nblocks; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1350 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1351 | if (block < nblocks) { |
| 1352 | start = 0; |
| 1353 | goto restart; |
| 1354 | } |
| 1355 | |
| 1356 | cleanup_and_exit: |
| 1357 | /* Clean up the read-ahead blocks */ |
| 1358 | for (; ra_ptr < ra_max; ra_ptr++) |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1359 | brelse(bh_use[ra_ptr]); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1360 | return ret; |
| 1361 | } |
| 1362 | |
Theodore Ts'o | f702ba0 | 2008-09-22 15:21:01 -0400 | [diff] [blame] | 1363 | static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct qstr *d_name, |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame^] | 1364 | struct ext4_dir_entry_2 **res_dir) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1365 | { |
Theodore Ts'o | 8941ec8 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1366 | struct super_block * sb = dir->i_sb; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1367 | struct dx_hash_info hinfo; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1368 | struct dx_frame frames[2], *frame; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1369 | struct buffer_head *bh; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1370 | ext4_lblk_t block; |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame^] | 1371 | int err = 0, retval; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1372 | |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame^] | 1373 | frame = dx_probe(d_name, dir, &hinfo, frames, &err); |
| 1374 | if (err) |
| 1375 | return ERR_PTR(err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1376 | do { |
| 1377 | block = dx_get_block(frame->at); |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 1378 | bh = ext4_read_dirblock(dir, block, DIRENT); |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame^] | 1379 | if (IS_ERR(bh)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1380 | goto errout; |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame^] | 1381 | |
Theodore Ts'o | 7845c04 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1382 | retval = search_dirblock(bh, dir, d_name, |
| 1383 | block << EXT4_BLOCK_SIZE_BITS(sb), |
| 1384 | res_dir); |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame^] | 1385 | if (retval == 1) |
| 1386 | goto success; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1387 | brelse(bh); |
Theodore Ts'o | 7845c04 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1388 | if (retval == -1) { |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame^] | 1389 | bh = ERR_PTR(ERR_BAD_DX_DIR); |
Theodore Ts'o | 7845c04 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1390 | goto errout; |
| 1391 | } |
| 1392 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1393 | /* Check to see if we should continue to search */ |
Theodore Ts'o | 8941ec8 | 2010-10-27 21:30:08 -0400 | [diff] [blame] | 1394 | retval = ext4_htree_next_block(dir, hinfo.hash, frame, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1395 | frames, NULL); |
| 1396 | if (retval < 0) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 1397 | ext4_warning(sb, |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame^] | 1398 | "error %d reading index page in directory #%lu", |
| 1399 | retval, dir->i_ino); |
| 1400 | bh = ERR_PTR(retval); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1401 | goto errout; |
| 1402 | } |
| 1403 | } while (retval == 1); |
| 1404 | |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame^] | 1405 | bh = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1406 | errout: |
Bernd Schubert | 265c6a0 | 2011-07-16 19:41:23 -0400 | [diff] [blame] | 1407 | dxtrace(printk(KERN_DEBUG "%s not found\n", d_name->name)); |
Theodore Ts'o | 537d8f9 | 2014-08-29 20:49:51 -0400 | [diff] [blame^] | 1408 | success: |
| 1409 | dx_release(frames); |
| 1410 | return bh; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1411 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1412 | |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 1413 | 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] | 1414 | { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1415 | struct inode *inode; |
| 1416 | struct ext4_dir_entry_2 *de; |
| 1417 | struct buffer_head *bh; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1418 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1419 | if (dentry->d_name.len > EXT4_NAME_LEN) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1420 | return ERR_PTR(-ENAMETOOLONG); |
| 1421 | |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 1422 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 1423 | if (IS_ERR(bh)) |
| 1424 | return (struct dentry *) bh; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1425 | inode = NULL; |
| 1426 | if (bh) { |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 1427 | __u32 ino = le32_to_cpu(de->inode); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1428 | brelse(bh); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1429 | if (!ext4_valid_inum(dir->i_sb, ino)) { |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 1430 | EXT4_ERROR_INODE(dir, "bad inode number: %u", ino); |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1431 | return ERR_PTR(-EIO); |
Vasily Averin | a6c15c2 | 2007-07-15 23:40:46 -0700 | [diff] [blame] | 1432 | } |
Andreas Dilger | 7e936b7 | 2012-05-28 17:02:25 -0400 | [diff] [blame] | 1433 | if (unlikely(ino == dir->i_ino)) { |
David Howells | a34e15c | 2014-01-06 14:04:23 -0500 | [diff] [blame] | 1434 | EXT4_ERROR_INODE(dir, "'%pd' linked to parent dir", |
| 1435 | dentry); |
Andreas Dilger | 7e936b7 | 2012-05-28 17:02:25 -0400 | [diff] [blame] | 1436 | return ERR_PTR(-EIO); |
| 1437 | } |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1438 | inode = ext4_iget(dir->i_sb, ino); |
Al Viro | a904937 | 2011-07-08 21:20:11 -0400 | [diff] [blame] | 1439 | if (inode == ERR_PTR(-ESTALE)) { |
| 1440 | EXT4_ERROR_INODE(dir, |
| 1441 | "deleted inode referenced: %u", |
| 1442 | ino); |
| 1443 | return ERR_PTR(-EIO); |
Bryan Donlan | e6f009b | 2009-02-22 21:20:25 -0500 | [diff] [blame] | 1444 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1445 | } |
| 1446 | return d_splice_alias(inode, dentry); |
| 1447 | } |
| 1448 | |
| 1449 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1450 | struct dentry *ext4_get_parent(struct dentry *child) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1451 | { |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 1452 | __u32 ino; |
Linus Torvalds | 26fe575 | 2012-05-10 13:14:12 -0700 | [diff] [blame] | 1453 | static const struct qstr dotdot = QSTR_INIT("..", 2); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1454 | struct ext4_dir_entry_2 * de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1455 | struct buffer_head *bh; |
| 1456 | |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 1457 | bh = ext4_find_entry(child->d_inode, &dotdot, &de, NULL); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 1458 | if (IS_ERR(bh)) |
| 1459 | return (struct dentry *) bh; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1460 | if (!bh) |
| 1461 | return ERR_PTR(-ENOENT); |
| 1462 | ino = le32_to_cpu(de->inode); |
| 1463 | brelse(bh); |
| 1464 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1465 | if (!ext4_valid_inum(child->d_inode->i_sb, ino)) { |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 1466 | EXT4_ERROR_INODE(child->d_inode, |
| 1467 | "bad parent inode number: %u", ino); |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1468 | return ERR_PTR(-EIO); |
Vasily Averin | a6c15c2 | 2007-07-15 23:40:46 -0700 | [diff] [blame] | 1469 | } |
| 1470 | |
Christoph Hellwig | 4400372 | 2008-08-11 15:49:04 +0200 | [diff] [blame] | 1471 | return d_obtain_alias(ext4_iget(child->d_inode->i_sb, ino)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1472 | } |
| 1473 | |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 1474 | /* |
| 1475 | * Move count entries from end of map between two memory locations. |
| 1476 | * Returns pointer to last entry moved. |
| 1477 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1478 | static struct ext4_dir_entry_2 * |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1479 | dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count, |
| 1480 | unsigned blocksize) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1481 | { |
| 1482 | unsigned rec_len = 0; |
| 1483 | |
| 1484 | while (count--) { |
Theodore Ts'o | 60e6679 | 2010-05-17 07:00:00 -0400 | [diff] [blame] | 1485 | struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *) |
Toshiyuki Okajima | 9aee228 | 2009-06-08 12:41:35 -0400 | [diff] [blame] | 1486 | (from + (map->offs<<2)); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1487 | rec_len = EXT4_DIR_REC_LEN(de->name_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1488 | memcpy (to, de, rec_len); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1489 | ((struct ext4_dir_entry_2 *) to)->rec_len = |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1490 | ext4_rec_len_to_disk(rec_len, blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1491 | de->inode = 0; |
| 1492 | map++; |
| 1493 | to += rec_len; |
| 1494 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1495 | return (struct ext4_dir_entry_2 *) (to - rec_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1496 | } |
| 1497 | |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 1498 | /* |
| 1499 | * Compact each dir entry in the range to the minimal rec_len. |
| 1500 | * Returns pointer to last entry in range. |
| 1501 | */ |
Theodore Ts'o | 8bad459 | 2009-02-14 21:46:54 -0500 | [diff] [blame] | 1502 | 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] | 1503 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1504 | 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] | 1505 | unsigned rec_len = 0; |
| 1506 | |
| 1507 | prev = to = de; |
Theodore Ts'o | 8bad459 | 2009-02-14 21:46:54 -0500 | [diff] [blame] | 1508 | while ((char*)de < base + blocksize) { |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1509 | next = ext4_next_entry(de, blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1510 | if (de->inode && de->name_len) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1511 | rec_len = EXT4_DIR_REC_LEN(de->name_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1512 | if (de > to) |
| 1513 | memmove(to, de, rec_len); |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1514 | to->rec_len = ext4_rec_len_to_disk(rec_len, blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1515 | prev = to; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1516 | to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1517 | } |
| 1518 | de = next; |
| 1519 | } |
| 1520 | return prev; |
| 1521 | } |
| 1522 | |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 1523 | /* |
| 1524 | * Split a full leaf block to make room for a new dir entry. |
| 1525 | * Allocate a new block, and move entries so that they are approx. equally full. |
| 1526 | * Returns pointer to de in block into which the new entry will be inserted. |
| 1527 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1528 | 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] | 1529 | struct buffer_head **bh,struct dx_frame *frame, |
| 1530 | struct dx_hash_info *hinfo, int *error) |
| 1531 | { |
| 1532 | unsigned blocksize = dir->i_sb->s_blocksize; |
| 1533 | unsigned count, continued; |
| 1534 | struct buffer_head *bh2; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1535 | ext4_lblk_t newblock; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1536 | u32 hash2; |
| 1537 | struct dx_map_entry *map; |
| 1538 | char *data1 = (*bh)->b_data, *data2; |
Theodore Ts'o | 59e315b | 2008-12-06 16:58:39 -0500 | [diff] [blame] | 1539 | unsigned split, move, size; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1540 | struct ext4_dir_entry_2 *de = NULL, *de2; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1541 | struct ext4_dir_entry_tail *t; |
| 1542 | int csum_size = 0; |
Theodore Ts'o | 59e315b | 2008-12-06 16:58:39 -0500 | [diff] [blame] | 1543 | int err = 0, i; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1544 | |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1545 | if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb, |
| 1546 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 1547 | csum_size = sizeof(struct ext4_dir_entry_tail); |
| 1548 | |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 1549 | bh2 = ext4_append(handle, dir, &newblock); |
| 1550 | if (IS_ERR(bh2)) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1551 | brelse(*bh); |
| 1552 | *bh = NULL; |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 1553 | *error = PTR_ERR(bh2); |
| 1554 | return NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1555 | } |
| 1556 | |
| 1557 | BUFFER_TRACE(*bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1558 | err = ext4_journal_get_write_access(handle, *bh); |
Dmitriy Monakhov | fedee54 | 2007-05-08 00:25:34 -0700 | [diff] [blame] | 1559 | if (err) |
| 1560 | goto journal_error; |
| 1561 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1562 | BUFFER_TRACE(frame->bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1563 | err = ext4_journal_get_write_access(handle, frame->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1564 | if (err) |
| 1565 | goto journal_error; |
| 1566 | |
| 1567 | data2 = bh2->b_data; |
| 1568 | |
| 1569 | /* create map in the end of data2 block */ |
| 1570 | map = (struct dx_map_entry *) (data2 + blocksize); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1571 | count = dx_make_map((struct ext4_dir_entry_2 *) data1, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1572 | blocksize, hinfo, map); |
| 1573 | map -= count; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1574 | dx_sort_map(map, count); |
Eric Sandeen | ef2b02d | 2007-09-18 22:46:42 -0700 | [diff] [blame] | 1575 | /* Split the existing block in the middle, size-wise */ |
| 1576 | size = 0; |
| 1577 | move = 0; |
| 1578 | for (i = count-1; i >= 0; i--) { |
| 1579 | /* is more than half of this entry in 2nd half of the block? */ |
| 1580 | if (size + map[i].size/2 > blocksize/2) |
| 1581 | break; |
| 1582 | size += map[i].size; |
| 1583 | move++; |
| 1584 | } |
| 1585 | /* map index at which we will split */ |
| 1586 | split = count - move; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1587 | hash2 = map[split].hash; |
| 1588 | continued = hash2 == map[split - 1].hash; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1589 | dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n", |
| 1590 | (unsigned long)dx_get_block(frame->at), |
| 1591 | hash2, split, count-split)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1592 | |
| 1593 | /* Fancy dance to stay within two buffers */ |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1594 | de2 = dx_move_dirents(data1, data2, map + split, count - split, blocksize); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1595 | de = dx_pack_dirents(data1, blocksize); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1596 | de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) - |
| 1597 | (char *) de, |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1598 | blocksize); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1599 | de2->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) - |
| 1600 | (char *) de2, |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1601 | blocksize); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1602 | if (csum_size) { |
| 1603 | t = EXT4_DIRENT_TAIL(data2, blocksize); |
| 1604 | initialize_dirent_tail(t, blocksize); |
| 1605 | |
| 1606 | t = EXT4_DIRENT_TAIL(data1, blocksize); |
| 1607 | initialize_dirent_tail(t, blocksize); |
| 1608 | } |
| 1609 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1610 | dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data1, blocksize, 1)); |
| 1611 | dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data2, blocksize, 1)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1612 | |
| 1613 | /* Which block gets the new entry? */ |
| 1614 | if (hinfo->hash >= hash2) |
| 1615 | { |
| 1616 | swap(*bh, bh2); |
| 1617 | de = de2; |
| 1618 | } |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1619 | dx_insert_block(frame, hash2 + continued, newblock); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1620 | err = ext4_handle_dirty_dirent_node(handle, dir, bh2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1621 | if (err) |
| 1622 | goto journal_error; |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 1623 | err = ext4_handle_dirty_dx_node(handle, dir, frame->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1624 | if (err) |
| 1625 | goto journal_error; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1626 | brelse(bh2); |
| 1627 | dxtrace(dx_show_index("frame", frame->entries)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1628 | return de; |
Dmitriy Monakhov | fedee54 | 2007-05-08 00:25:34 -0700 | [diff] [blame] | 1629 | |
| 1630 | journal_error: |
| 1631 | brelse(*bh); |
| 1632 | brelse(bh2); |
| 1633 | *bh = NULL; |
| 1634 | ext4_std_error(dir->i_sb, err); |
Dmitriy Monakhov | fedee54 | 2007-05-08 00:25:34 -0700 | [diff] [blame] | 1635 | *error = err; |
| 1636 | return NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1637 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1638 | |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1639 | int ext4_find_dest_de(struct inode *dir, struct inode *inode, |
| 1640 | struct buffer_head *bh, |
| 1641 | void *buf, int buf_size, |
| 1642 | const char *name, int namelen, |
| 1643 | struct ext4_dir_entry_2 **dest_de) |
| 1644 | { |
| 1645 | struct ext4_dir_entry_2 *de; |
| 1646 | unsigned short reclen = EXT4_DIR_REC_LEN(namelen); |
| 1647 | int nlen, rlen; |
| 1648 | unsigned int offset = 0; |
| 1649 | char *top; |
| 1650 | |
| 1651 | de = (struct ext4_dir_entry_2 *)buf; |
| 1652 | top = buf + buf_size - reclen; |
| 1653 | while ((char *) de <= top) { |
| 1654 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
| 1655 | buf, buf_size, offset)) |
| 1656 | return -EIO; |
| 1657 | if (ext4_match(namelen, name, de)) |
| 1658 | return -EEXIST; |
| 1659 | nlen = EXT4_DIR_REC_LEN(de->name_len); |
| 1660 | rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); |
| 1661 | if ((de->inode ? rlen - nlen : rlen) >= reclen) |
| 1662 | break; |
| 1663 | de = (struct ext4_dir_entry_2 *)((char *)de + rlen); |
| 1664 | offset += rlen; |
| 1665 | } |
| 1666 | if ((char *) de > top) |
| 1667 | return -ENOSPC; |
| 1668 | |
| 1669 | *dest_de = de; |
| 1670 | return 0; |
| 1671 | } |
| 1672 | |
| 1673 | void ext4_insert_dentry(struct inode *inode, |
| 1674 | struct ext4_dir_entry_2 *de, |
| 1675 | int buf_size, |
| 1676 | const char *name, int namelen) |
| 1677 | { |
| 1678 | |
| 1679 | int nlen, rlen; |
| 1680 | |
| 1681 | nlen = EXT4_DIR_REC_LEN(de->name_len); |
| 1682 | rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); |
| 1683 | if (de->inode) { |
| 1684 | struct ext4_dir_entry_2 *de1 = |
| 1685 | (struct ext4_dir_entry_2 *)((char *)de + nlen); |
| 1686 | de1->rec_len = ext4_rec_len_to_disk(rlen - nlen, buf_size); |
| 1687 | de->rec_len = ext4_rec_len_to_disk(nlen, buf_size); |
| 1688 | de = de1; |
| 1689 | } |
| 1690 | de->file_type = EXT4_FT_UNKNOWN; |
| 1691 | de->inode = cpu_to_le32(inode->i_ino); |
| 1692 | ext4_set_de_type(inode->i_sb, de, inode->i_mode); |
| 1693 | de->name_len = namelen; |
| 1694 | memcpy(de->name, name, namelen); |
| 1695 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1696 | /* |
| 1697 | * Add a new entry into a directory (leaf) block. If de is non-NULL, |
| 1698 | * it points to a directory entry which is guaranteed to be large |
| 1699 | * enough for new directory entry. If de is NULL, then |
| 1700 | * add_dirent_to_buf will attempt search the directory block for |
| 1701 | * space. It will return -ENOSPC if no space is available, and -EIO |
| 1702 | * and -EEXIST if directory entry already exists. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1703 | */ |
| 1704 | static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1705 | struct inode *inode, struct ext4_dir_entry_2 *de, |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1706 | struct buffer_head *bh) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1707 | { |
| 1708 | struct inode *dir = dentry->d_parent->d_inode; |
| 1709 | const char *name = dentry->d_name.name; |
| 1710 | int namelen = dentry->d_name.len; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1711 | unsigned int blocksize = dir->i_sb->s_blocksize; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1712 | int csum_size = 0; |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1713 | int err; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1714 | |
| 1715 | if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
| 1716 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 1717 | csum_size = sizeof(struct ext4_dir_entry_tail); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1718 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1719 | if (!de) { |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1720 | err = ext4_find_dest_de(dir, inode, |
| 1721 | bh, bh->b_data, blocksize - csum_size, |
| 1722 | name, namelen, &de); |
| 1723 | if (err) |
| 1724 | return err; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1725 | } |
| 1726 | BUFFER_TRACE(bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1727 | err = ext4_journal_get_write_access(handle, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1728 | if (err) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1729 | ext4_std_error(dir->i_sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1730 | return err; |
| 1731 | } |
| 1732 | |
| 1733 | /* By now the buffer is marked for journaling */ |
Tao Ma | 978fef9 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 1734 | ext4_insert_dentry(inode, de, blocksize, name, namelen); |
| 1735 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1736 | /* |
| 1737 | * XXX shouldn't update any times until successful |
| 1738 | * completion of syscall, but too many callers depend |
| 1739 | * on this. |
| 1740 | * |
| 1741 | * XXX similarly, too many callers depend on |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1742 | * ext4_new_inode() setting the times, but error |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1743 | * recovery deletes the inode, so the worst that can |
| 1744 | * happen is that the times are slightly out of date |
| 1745 | * and/or different from the directory change time. |
| 1746 | */ |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 1747 | dir->i_mtime = dir->i_ctime = ext4_current_time(dir); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1748 | ext4_update_dx_flag(dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1749 | dir->i_version++; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1750 | ext4_mark_inode_dirty(handle, dir); |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 1751 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1752 | err = ext4_handle_dirty_dirent_node(handle, dir, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1753 | if (err) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1754 | ext4_std_error(dir->i_sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1755 | return 0; |
| 1756 | } |
| 1757 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1758 | /* |
| 1759 | * This converts a one block unindexed directory to a 3 block indexed |
| 1760 | * directory, and adds the dentry to the indexed directory. |
| 1761 | */ |
| 1762 | static int make_indexed_dir(handle_t *handle, struct dentry *dentry, |
| 1763 | struct inode *inode, struct buffer_head *bh) |
| 1764 | { |
| 1765 | struct inode *dir = dentry->d_parent->d_inode; |
| 1766 | const char *name = dentry->d_name.name; |
| 1767 | int namelen = dentry->d_name.len; |
| 1768 | struct buffer_head *bh2; |
| 1769 | struct dx_root *root; |
| 1770 | struct dx_frame frames[2], *frame; |
| 1771 | struct dx_entry *entries; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1772 | struct ext4_dir_entry_2 *de, *de2; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1773 | struct ext4_dir_entry_tail *t; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1774 | char *data1, *top; |
| 1775 | unsigned len; |
| 1776 | int retval; |
| 1777 | unsigned blocksize; |
| 1778 | struct dx_hash_info hinfo; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1779 | ext4_lblk_t block; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1780 | struct fake_dirent *fde; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1781 | int csum_size = 0; |
| 1782 | |
| 1783 | if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
| 1784 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 1785 | csum_size = sizeof(struct ext4_dir_entry_tail); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1786 | |
| 1787 | blocksize = dir->i_sb->s_blocksize; |
Theodore Ts'o | e6b8bc0 | 2009-01-16 11:13:40 -0500 | [diff] [blame] | 1788 | dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino)); |
liang xie | 5d60125 | 2014-05-12 22:06:43 -0400 | [diff] [blame] | 1789 | BUFFER_TRACE(bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1790 | retval = ext4_journal_get_write_access(handle, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1791 | if (retval) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1792 | ext4_std_error(dir->i_sb, retval); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1793 | brelse(bh); |
| 1794 | return retval; |
| 1795 | } |
| 1796 | root = (struct dx_root *) bh->b_data; |
| 1797 | |
Theodore Ts'o | e6b8bc0 | 2009-01-16 11:13:40 -0500 | [diff] [blame] | 1798 | /* The 0th block becomes the root, move the dirents out */ |
| 1799 | fde = &root->dotdot; |
| 1800 | de = (struct ext4_dir_entry_2 *)((char *)fde + |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1801 | ext4_rec_len_from_disk(fde->rec_len, blocksize)); |
Theodore Ts'o | e6b8bc0 | 2009-01-16 11:13:40 -0500 | [diff] [blame] | 1802 | if ((char *) de >= (((char *) root) + blocksize)) { |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 1803 | EXT4_ERROR_INODE(dir, "invalid rec_len for '..'"); |
Theodore Ts'o | e6b8bc0 | 2009-01-16 11:13:40 -0500 | [diff] [blame] | 1804 | brelse(bh); |
| 1805 | return -EIO; |
| 1806 | } |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1807 | len = ((char *) root) + (blocksize - csum_size) - (char *) de; |
Theodore Ts'o | e6b8bc0 | 2009-01-16 11:13:40 -0500 | [diff] [blame] | 1808 | |
| 1809 | /* Allocate new block for the 0th block's dirents */ |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 1810 | bh2 = ext4_append(handle, dir, &block); |
| 1811 | if (IS_ERR(bh2)) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1812 | brelse(bh); |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 1813 | return PTR_ERR(bh2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1814 | } |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 1815 | ext4_set_inode_flag(dir, EXT4_INODE_INDEX); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1816 | data1 = bh2->b_data; |
| 1817 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1818 | memcpy (data1, de, len); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1819 | de = (struct ext4_dir_entry_2 *) data1; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1820 | top = data1 + len; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1821 | while ((char *)(de2 = ext4_next_entry(de, blocksize)) < top) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1822 | de = de2; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1823 | de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) - |
| 1824 | (char *) de, |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1825 | blocksize); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1826 | |
| 1827 | if (csum_size) { |
| 1828 | t = EXT4_DIRENT_TAIL(data1, blocksize); |
| 1829 | initialize_dirent_tail(t, blocksize); |
| 1830 | } |
| 1831 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1832 | /* Initialize the root; the dot dirents already exist */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1833 | de = (struct ext4_dir_entry_2 *) (&root->dotdot); |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 1834 | de->rec_len = ext4_rec_len_to_disk(blocksize - EXT4_DIR_REC_LEN(2), |
| 1835 | blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1836 | memset (&root->info, 0, sizeof(root->info)); |
| 1837 | root->info.info_length = sizeof(root->info); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1838 | 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] | 1839 | entries = root->entries; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1840 | dx_set_block(entries, 1); |
| 1841 | dx_set_count(entries, 1); |
| 1842 | dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info))); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1843 | |
| 1844 | /* Initialize as for dx_probe */ |
| 1845 | hinfo.hash_version = root->info.hash_version; |
Theodore Ts'o | f99b258 | 2008-10-28 13:21:44 -0400 | [diff] [blame] | 1846 | if (hinfo.hash_version <= DX_HASH_TEA) |
| 1847 | hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1848 | hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
| 1849 | ext4fs_dirhash(name, namelen, &hinfo); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1850 | frame = frames; |
| 1851 | frame->entries = entries; |
| 1852 | frame->at = entries; |
| 1853 | frame->bh = bh; |
| 1854 | bh = bh2; |
Allison Henderson | 6976a6f | 2011-05-15 00:19:41 -0400 | [diff] [blame] | 1855 | |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 1856 | ext4_handle_dirty_dx_node(handle, dir, frame->bh); |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1857 | ext4_handle_dirty_dirent_node(handle, dir, bh); |
Allison Henderson | 6976a6f | 2011-05-15 00:19:41 -0400 | [diff] [blame] | 1858 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1859 | de = do_split(handle,dir, &bh, frame, &hinfo, &retval); |
Jan Kara | 7ad8e4e | 2011-05-03 11:05:55 -0400 | [diff] [blame] | 1860 | if (!de) { |
| 1861 | /* |
| 1862 | * Even if the block split failed, we have to properly write |
| 1863 | * out all the changes we did so far. Otherwise we can end up |
| 1864 | * with corrupted filesystem. |
| 1865 | */ |
| 1866 | ext4_mark_inode_dirty(handle, dir); |
Jan Kara | 7ad8e4e | 2011-05-03 11:05:55 -0400 | [diff] [blame] | 1867 | dx_release(frames); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1868 | return retval; |
Jan Kara | 7ad8e4e | 2011-05-03 11:05:55 -0400 | [diff] [blame] | 1869 | } |
| 1870 | dx_release(frames); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1871 | |
Theodore Ts'o | 2de770a | 2009-11-23 07:25:49 -0500 | [diff] [blame] | 1872 | retval = add_dirent_to_buf(handle, dentry, inode, de, bh); |
| 1873 | brelse(bh); |
| 1874 | return retval; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1875 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1876 | |
| 1877 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1878 | * ext4_add_entry() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1879 | * |
| 1880 | * adds a file entry to the specified directory, using the same |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1881 | * semantics as ext4_find_entry(). It returns NULL if it failed. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1882 | * |
| 1883 | * NOTE!! The inode part of 'de' is left at 0 - which means you |
| 1884 | * may not sleep between calling this and putting something into |
| 1885 | * the entry, as someone else might have used it while you slept. |
| 1886 | */ |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1887 | static int ext4_add_entry(handle_t *handle, struct dentry *dentry, |
| 1888 | struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1889 | { |
| 1890 | struct inode *dir = dentry->d_parent->d_inode; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1891 | struct buffer_head *bh; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1892 | struct ext4_dir_entry_2 *de; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1893 | struct ext4_dir_entry_tail *t; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1894 | struct super_block *sb; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1895 | int retval; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1896 | int dx_fallback=0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1897 | unsigned blocksize; |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1898 | ext4_lblk_t block, blocks; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1899 | int csum_size = 0; |
| 1900 | |
| 1901 | if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
| 1902 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 1903 | csum_size = sizeof(struct ext4_dir_entry_tail); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1904 | |
| 1905 | sb = dir->i_sb; |
| 1906 | blocksize = sb->s_blocksize; |
| 1907 | if (!dentry->d_name.len) |
| 1908 | return -EINVAL; |
Tao Ma | 3c47d54 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 1909 | |
| 1910 | if (ext4_has_inline_data(dir)) { |
| 1911 | retval = ext4_try_add_inline_entry(handle, dentry, inode); |
| 1912 | if (retval < 0) |
| 1913 | return retval; |
| 1914 | if (retval == 1) { |
| 1915 | retval = 0; |
| 1916 | return retval; |
| 1917 | } |
| 1918 | } |
| 1919 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1920 | if (is_dx(dir)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1921 | retval = ext4_dx_add_entry(handle, dentry, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1922 | if (!retval || (retval != ERR_BAD_DX_DIR)) |
| 1923 | return retval; |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 1924 | ext4_clear_inode_flag(dir, EXT4_INODE_INDEX); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1925 | dx_fallback++; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1926 | ext4_mark_inode_dirty(handle, dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1927 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1928 | blocks = dir->i_size >> sb->s_blocksize_bits; |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 1929 | for (block = 0; block < blocks; block++) { |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 1930 | bh = ext4_read_dirblock(dir, block, DIRENT); |
| 1931 | if (IS_ERR(bh)) |
| 1932 | return PTR_ERR(bh); |
| 1933 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1934 | retval = add_dirent_to_buf(handle, dentry, inode, NULL, bh); |
Theodore Ts'o | 2de770a | 2009-11-23 07:25:49 -0500 | [diff] [blame] | 1935 | if (retval != -ENOSPC) { |
| 1936 | brelse(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1937 | return retval; |
Theodore Ts'o | 2de770a | 2009-11-23 07:25:49 -0500 | [diff] [blame] | 1938 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1939 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1940 | if (blocks == 1 && !dx_fallback && |
Theodore Ts'o | 1e424a3 | 2009-11-08 15:45:44 -0500 | [diff] [blame] | 1941 | EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) |
| 1942 | return make_indexed_dir(handle, dentry, inode, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1943 | brelse(bh); |
| 1944 | } |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 1945 | bh = ext4_append(handle, dir, &block); |
| 1946 | if (IS_ERR(bh)) |
| 1947 | return PTR_ERR(bh); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1948 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1949 | de->inode = 0; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 1950 | de->rec_len = ext4_rec_len_to_disk(blocksize - csum_size, blocksize); |
| 1951 | |
| 1952 | if (csum_size) { |
| 1953 | t = EXT4_DIRENT_TAIL(bh->b_data, blocksize); |
| 1954 | initialize_dirent_tail(t, blocksize); |
| 1955 | } |
| 1956 | |
Theodore Ts'o | 2de770a | 2009-11-23 07:25:49 -0500 | [diff] [blame] | 1957 | retval = add_dirent_to_buf(handle, dentry, inode, de, bh); |
| 1958 | brelse(bh); |
Frank Mayhar | 14ece10 | 2010-05-17 08:00:00 -0400 | [diff] [blame] | 1959 | if (retval == 0) |
| 1960 | ext4_set_inode_state(inode, EXT4_STATE_NEWENTRY); |
Theodore Ts'o | 2de770a | 2009-11-23 07:25:49 -0500 | [diff] [blame] | 1961 | return retval; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1962 | } |
| 1963 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1964 | /* |
| 1965 | * Returns 0 for success, or a negative error value |
| 1966 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1967 | static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1968 | struct inode *inode) |
| 1969 | { |
| 1970 | struct dx_frame frames[2], *frame; |
| 1971 | struct dx_entry *entries, *at; |
| 1972 | struct dx_hash_info hinfo; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1973 | struct buffer_head *bh; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1974 | struct inode *dir = dentry->d_parent->d_inode; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1975 | struct super_block *sb = dir->i_sb; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1976 | struct ext4_dir_entry_2 *de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1977 | int err; |
| 1978 | |
Theodore Ts'o | f702ba0 | 2008-09-22 15:21:01 -0400 | [diff] [blame] | 1979 | frame = dx_probe(&dentry->d_name, dir, &hinfo, frames, &err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1980 | if (!frame) |
| 1981 | return err; |
| 1982 | entries = frame->entries; |
| 1983 | at = frame->at; |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 1984 | bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT); |
| 1985 | if (IS_ERR(bh)) { |
| 1986 | err = PTR_ERR(bh); |
| 1987 | bh = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1988 | goto cleanup; |
Carlos Maiolino | 6d1ab10 | 2012-09-27 09:31:33 -0400 | [diff] [blame] | 1989 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1990 | |
| 1991 | BUFFER_TRACE(bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1992 | err = ext4_journal_get_write_access(handle, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1993 | if (err) |
| 1994 | goto journal_error; |
| 1995 | |
| 1996 | err = add_dirent_to_buf(handle, dentry, inode, NULL, bh); |
Theodore Ts'o | 2de770a | 2009-11-23 07:25:49 -0500 | [diff] [blame] | 1997 | if (err != -ENOSPC) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1998 | goto cleanup; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1999 | |
| 2000 | /* Block full, should compress but for now just split */ |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 2001 | dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2002 | dx_get_count(entries), dx_get_limit(entries))); |
| 2003 | /* Need to split index? */ |
| 2004 | if (dx_get_count(entries) == dx_get_limit(entries)) { |
Aneesh Kumar K.V | 725d26d | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2005 | ext4_lblk_t newblock; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2006 | unsigned icount = dx_get_count(entries); |
| 2007 | int levels = frame - frames; |
| 2008 | struct dx_entry *entries2; |
| 2009 | struct dx_node *node2; |
| 2010 | struct buffer_head *bh2; |
| 2011 | |
| 2012 | if (levels && (dx_get_count(frames->entries) == |
| 2013 | dx_get_limit(frames->entries))) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 2014 | ext4_warning(sb, "Directory index full!"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2015 | err = -ENOSPC; |
| 2016 | goto cleanup; |
| 2017 | } |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 2018 | bh2 = ext4_append(handle, dir, &newblock); |
| 2019 | if (IS_ERR(bh2)) { |
| 2020 | err = PTR_ERR(bh2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2021 | goto cleanup; |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 2022 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2023 | node2 = (struct dx_node *)(bh2->b_data); |
| 2024 | entries2 = node2->entries; |
Andreas Schlick | 1f7bebb | 2009-09-10 23:16:07 -0400 | [diff] [blame] | 2025 | memset(&node2->fake, 0, sizeof(struct fake_dirent)); |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2026 | node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize, |
| 2027 | sb->s_blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2028 | BUFFER_TRACE(frame->bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2029 | err = ext4_journal_get_write_access(handle, frame->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2030 | if (err) |
| 2031 | goto journal_error; |
| 2032 | if (levels) { |
| 2033 | unsigned icount1 = icount/2, icount2 = icount - icount1; |
| 2034 | unsigned hash2 = dx_get_hash(entries + icount1); |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 2035 | dxtrace(printk(KERN_DEBUG "Split index %i/%i\n", |
| 2036 | icount1, icount2)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2037 | |
| 2038 | BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2039 | err = ext4_journal_get_write_access(handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2040 | frames[0].bh); |
| 2041 | if (err) |
| 2042 | goto journal_error; |
| 2043 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2044 | memcpy((char *) entries2, (char *) (entries + icount1), |
| 2045 | icount2 * sizeof(struct dx_entry)); |
| 2046 | dx_set_count(entries, icount1); |
| 2047 | dx_set_count(entries2, icount2); |
| 2048 | dx_set_limit(entries2, dx_node_limit(dir)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2049 | |
| 2050 | /* Which index block gets the new entry? */ |
| 2051 | if (at - entries >= icount1) { |
| 2052 | frame->at = at = at - entries - icount1 + entries2; |
| 2053 | frame->entries = entries = entries2; |
| 2054 | swap(frame->bh, bh2); |
| 2055 | } |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2056 | dx_insert_block(frames + 0, hash2, newblock); |
| 2057 | dxtrace(dx_show_index("node", frames[1].entries)); |
| 2058 | dxtrace(dx_show_index("node", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2059 | ((struct dx_node *) bh2->b_data)->entries)); |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 2060 | err = ext4_handle_dirty_dx_node(handle, dir, bh2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2061 | if (err) |
| 2062 | goto journal_error; |
| 2063 | brelse (bh2); |
| 2064 | } else { |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 2065 | dxtrace(printk(KERN_DEBUG |
| 2066 | "Creating second level index...\n")); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2067 | memcpy((char *) entries2, (char *) entries, |
| 2068 | icount * sizeof(struct dx_entry)); |
| 2069 | dx_set_limit(entries2, dx_node_limit(dir)); |
| 2070 | |
| 2071 | /* Set up root */ |
| 2072 | dx_set_count(entries, 1); |
| 2073 | dx_set_block(entries + 0, newblock); |
| 2074 | ((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels = 1; |
| 2075 | |
| 2076 | /* Add new access path frame */ |
| 2077 | frame = frames + 1; |
| 2078 | frame->at = at = at - entries + entries2; |
| 2079 | frame->entries = entries = entries2; |
| 2080 | frame->bh = bh2; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2081 | err = ext4_journal_get_write_access(handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2082 | frame->bh); |
| 2083 | if (err) |
| 2084 | goto journal_error; |
| 2085 | } |
Darrick J. Wong | dbe8944 | 2012-04-29 18:39:10 -0400 | [diff] [blame] | 2086 | err = ext4_handle_dirty_dx_node(handle, dir, frames[0].bh); |
Theodore Ts'o | b409714 | 2011-01-10 12:46:59 -0500 | [diff] [blame] | 2087 | if (err) { |
| 2088 | ext4_std_error(inode->i_sb, err); |
| 2089 | goto cleanup; |
| 2090 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2091 | } |
| 2092 | de = do_split(handle, dir, &bh, frame, &hinfo, &err); |
| 2093 | if (!de) |
| 2094 | goto cleanup; |
| 2095 | err = add_dirent_to_buf(handle, dentry, inode, de, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2096 | goto cleanup; |
| 2097 | |
| 2098 | journal_error: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2099 | ext4_std_error(dir->i_sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2100 | cleanup: |
Guo Chao | b1deefc | 2013-01-28 21:41:02 -0500 | [diff] [blame] | 2101 | brelse(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2102 | dx_release(frames); |
| 2103 | return err; |
| 2104 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2105 | |
| 2106 | /* |
Tao Ma | 05019a9 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2107 | * ext4_generic_delete_entry deletes a directory entry by merging it |
| 2108 | * with the previous entry |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2109 | */ |
Tao Ma | 05019a9 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2110 | int ext4_generic_delete_entry(handle_t *handle, |
| 2111 | struct inode *dir, |
| 2112 | struct ext4_dir_entry_2 *de_del, |
| 2113 | struct buffer_head *bh, |
| 2114 | void *entry_buf, |
| 2115 | int buf_size, |
| 2116 | int csum_size) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2117 | { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2118 | struct ext4_dir_entry_2 *de, *pde; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2119 | unsigned int blocksize = dir->i_sb->s_blocksize; |
Tao Ma | 05019a9 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2120 | int i; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 2121 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2122 | i = 0; |
| 2123 | pde = NULL; |
Tao Ma | 05019a9 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2124 | de = (struct ext4_dir_entry_2 *)entry_buf; |
| 2125 | while (i < buf_size - csum_size) { |
Tao Ma | 226ba97 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 2126 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
| 2127 | bh->b_data, bh->b_size, i)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2128 | return -EIO; |
| 2129 | if (de == de_del) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2130 | if (pde) |
Jan Kara | a72d7f8 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2131 | pde->rec_len = ext4_rec_len_to_disk( |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2132 | ext4_rec_len_from_disk(pde->rec_len, |
| 2133 | blocksize) + |
| 2134 | ext4_rec_len_from_disk(de->rec_len, |
| 2135 | blocksize), |
| 2136 | blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2137 | else |
| 2138 | de->inode = 0; |
| 2139 | dir->i_version++; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2140 | return 0; |
| 2141 | } |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2142 | i += ext4_rec_len_from_disk(de->rec_len, blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2143 | pde = de; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2144 | de = ext4_next_entry(de, blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2145 | } |
| 2146 | return -ENOENT; |
| 2147 | } |
| 2148 | |
Tao Ma | 05019a9 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2149 | static int ext4_delete_entry(handle_t *handle, |
| 2150 | struct inode *dir, |
| 2151 | struct ext4_dir_entry_2 *de_del, |
| 2152 | struct buffer_head *bh) |
| 2153 | { |
| 2154 | int err, csum_size = 0; |
| 2155 | |
Tao Ma | 9f40fe5 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2156 | if (ext4_has_inline_data(dir)) { |
| 2157 | int has_inline_data = 1; |
| 2158 | err = ext4_delete_inline_entry(handle, dir, de_del, bh, |
| 2159 | &has_inline_data); |
| 2160 | if (has_inline_data) |
| 2161 | return err; |
| 2162 | } |
| 2163 | |
Tao Ma | 05019a9 | 2012-12-10 14:06:00 -0500 | [diff] [blame] | 2164 | if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb, |
| 2165 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 2166 | csum_size = sizeof(struct ext4_dir_entry_tail); |
| 2167 | |
| 2168 | BUFFER_TRACE(bh, "get_write_access"); |
| 2169 | err = ext4_journal_get_write_access(handle, bh); |
| 2170 | if (unlikely(err)) |
| 2171 | goto out; |
| 2172 | |
| 2173 | err = ext4_generic_delete_entry(handle, dir, de_del, |
| 2174 | bh, bh->b_data, |
| 2175 | dir->i_sb->s_blocksize, csum_size); |
| 2176 | if (err) |
| 2177 | goto out; |
| 2178 | |
| 2179 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
| 2180 | err = ext4_handle_dirty_dirent_node(handle, dir, bh); |
| 2181 | if (unlikely(err)) |
| 2182 | goto out; |
| 2183 | |
| 2184 | return 0; |
| 2185 | out: |
| 2186 | if (err != -ENOENT) |
| 2187 | ext4_std_error(dir->i_sb, err); |
| 2188 | return err; |
| 2189 | } |
| 2190 | |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2191 | /* |
| 2192 | * DIR_NLINK feature is set if 1) nlinks > EXT4_LINK_MAX or 2) nlinks == 2, |
| 2193 | * since this indicates that nlinks count was previously 1. |
| 2194 | */ |
| 2195 | static void ext4_inc_count(handle_t *handle, struct inode *inode) |
| 2196 | { |
| 2197 | inc_nlink(inode); |
| 2198 | if (is_dx(inode) && inode->i_nlink > 1) { |
| 2199 | /* limit is 16-bit i_links_count */ |
| 2200 | if (inode->i_nlink >= EXT4_LINK_MAX || inode->i_nlink == 2) { |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 2201 | set_nlink(inode, 1); |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2202 | EXT4_SET_RO_COMPAT_FEATURE(inode->i_sb, |
| 2203 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK); |
| 2204 | } |
| 2205 | } |
| 2206 | } |
| 2207 | |
| 2208 | /* |
| 2209 | * If a directory had nlink == 1, then we should let it be 1. This indicates |
| 2210 | * directory has >EXT4_LINK_MAX subdirs. |
| 2211 | */ |
| 2212 | static void ext4_dec_count(handle_t *handle, struct inode *inode) |
| 2213 | { |
Andreas Dilger | 909a4cf | 2011-10-26 03:22:31 -0400 | [diff] [blame] | 2214 | if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) |
| 2215 | drop_nlink(inode); |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2216 | } |
| 2217 | |
| 2218 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2219 | static int ext4_add_nondir(handle_t *handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2220 | struct dentry *dentry, struct inode *inode) |
| 2221 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2222 | int err = ext4_add_entry(handle, dentry, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2223 | if (!err) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2224 | ext4_mark_inode_dirty(handle, inode); |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 2225 | unlock_new_inode(inode); |
Al Viro | 8fc37ec | 2012-07-19 09:18:15 +0400 | [diff] [blame] | 2226 | d_instantiate(dentry, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2227 | return 0; |
| 2228 | } |
Eric Sandeen | 731b9a5 | 2007-02-10 01:46:16 -0800 | [diff] [blame] | 2229 | drop_nlink(inode); |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 2230 | unlock_new_inode(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2231 | iput(inode); |
| 2232 | return err; |
| 2233 | } |
| 2234 | |
| 2235 | /* |
| 2236 | * By the time this is called, we already have created |
| 2237 | * the directory cache entry for the new file, but it |
| 2238 | * is so far negative - it has no inode. |
| 2239 | * |
| 2240 | * If the create succeeds, we fill in the inode information |
| 2241 | * with d_instantiate(). |
| 2242 | */ |
Al Viro | 4acdaf2 | 2011-07-26 01:42:34 -0400 | [diff] [blame] | 2243 | 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] | 2244 | bool excl) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2245 | { |
| 2246 | handle_t *handle; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2247 | struct inode *inode; |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2248 | int err, credits, retries = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2249 | |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 2250 | dquot_initialize(dir); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 2251 | |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2252 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
Jan Kara | eb9cc7e | 2013-04-19 13:38:14 -0400 | [diff] [blame] | 2253 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2254 | retry: |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2255 | inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0, |
| 2256 | NULL, EXT4_HT_DIR, credits); |
| 2257 | handle = ext4_journal_current_handle(); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2258 | err = PTR_ERR(inode); |
| 2259 | if (!IS_ERR(inode)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2260 | inode->i_op = &ext4_file_inode_operations; |
| 2261 | inode->i_fop = &ext4_file_operations; |
| 2262 | ext4_set_aops(inode); |
| 2263 | err = ext4_add_nondir(handle, dentry, inode); |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2264 | if (!err && IS_DIRSYNC(dir)) |
| 2265 | ext4_handle_sync(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2266 | } |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2267 | if (handle) |
| 2268 | ext4_journal_stop(handle); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2269 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2270 | goto retry; |
| 2271 | return err; |
| 2272 | } |
| 2273 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2274 | static int ext4_mknod(struct inode *dir, struct dentry *dentry, |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 2275 | umode_t mode, dev_t rdev) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2276 | { |
| 2277 | handle_t *handle; |
| 2278 | struct inode *inode; |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2279 | int err, credits, retries = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2280 | |
| 2281 | if (!new_valid_dev(rdev)) |
| 2282 | return -EINVAL; |
| 2283 | |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 2284 | dquot_initialize(dir); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 2285 | |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2286 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
Jan Kara | eb9cc7e | 2013-04-19 13:38:14 -0400 | [diff] [blame] | 2287 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2288 | retry: |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2289 | inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0, |
| 2290 | NULL, EXT4_HT_DIR, credits); |
| 2291 | handle = ext4_journal_current_handle(); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2292 | err = PTR_ERR(inode); |
| 2293 | if (!IS_ERR(inode)) { |
| 2294 | init_special_inode(inode, inode->i_mode, rdev); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2295 | inode->i_op = &ext4_special_inode_operations; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2296 | err = ext4_add_nondir(handle, dentry, inode); |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2297 | if (!err && IS_DIRSYNC(dir)) |
| 2298 | ext4_handle_sync(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2299 | } |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2300 | if (handle) |
| 2301 | ext4_journal_stop(handle); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2302 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2303 | goto retry; |
| 2304 | return err; |
| 2305 | } |
| 2306 | |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2307 | static int ext4_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
| 2308 | { |
| 2309 | handle_t *handle; |
| 2310 | struct inode *inode; |
| 2311 | int err, retries = 0; |
| 2312 | |
| 2313 | dquot_initialize(dir); |
| 2314 | |
| 2315 | retry: |
| 2316 | inode = ext4_new_inode_start_handle(dir, mode, |
| 2317 | NULL, 0, NULL, |
| 2318 | EXT4_HT_DIR, |
| 2319 | EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) + |
| 2320 | 4 + EXT4_XATTR_TRANS_BLOCKS); |
| 2321 | handle = ext4_journal_current_handle(); |
| 2322 | err = PTR_ERR(inode); |
| 2323 | if (!IS_ERR(inode)) { |
| 2324 | inode->i_op = &ext4_file_inode_operations; |
| 2325 | inode->i_fop = &ext4_file_operations; |
| 2326 | ext4_set_aops(inode); |
Zheng Liu | e94bd34 | 2013-07-20 21:58:38 -0400 | [diff] [blame] | 2327 | d_tmpfile(dentry, inode); |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2328 | err = ext4_orphan_add(handle, inode); |
| 2329 | if (err) |
Miklos Szeredi | 43ae9e3 | 2013-10-10 16:48:19 +0200 | [diff] [blame] | 2330 | goto err_unlock_inode; |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2331 | mark_inode_dirty(inode); |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2332 | unlock_new_inode(inode); |
| 2333 | } |
| 2334 | if (handle) |
| 2335 | ext4_journal_stop(handle); |
| 2336 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
| 2337 | goto retry; |
| 2338 | return err; |
Miklos Szeredi | 43ae9e3 | 2013-10-10 16:48:19 +0200 | [diff] [blame] | 2339 | err_unlock_inode: |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2340 | ext4_journal_stop(handle); |
| 2341 | unlock_new_inode(inode); |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2342 | return err; |
| 2343 | } |
| 2344 | |
Tao Ma | a774f9c | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2345 | struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, |
| 2346 | struct ext4_dir_entry_2 *de, |
| 2347 | int blocksize, int csum_size, |
| 2348 | unsigned int parent_ino, int dotdot_real_len) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2349 | { |
Tao Ma | a774f9c | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2350 | de->inode = cpu_to_le32(inode->i_ino); |
| 2351 | de->name_len = 1; |
| 2352 | de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len), |
| 2353 | blocksize); |
| 2354 | strcpy(de->name, "."); |
| 2355 | ext4_set_de_type(inode->i_sb, de, S_IFDIR); |
| 2356 | |
| 2357 | de = ext4_next_entry(de, blocksize); |
| 2358 | de->inode = cpu_to_le32(parent_ino); |
| 2359 | de->name_len = 2; |
| 2360 | if (!dotdot_real_len) |
| 2361 | de->rec_len = ext4_rec_len_to_disk(blocksize - |
| 2362 | (csum_size + EXT4_DIR_REC_LEN(1)), |
| 2363 | blocksize); |
| 2364 | else |
| 2365 | de->rec_len = ext4_rec_len_to_disk( |
| 2366 | EXT4_DIR_REC_LEN(de->name_len), blocksize); |
| 2367 | strcpy(de->name, ".."); |
| 2368 | ext4_set_de_type(inode->i_sb, de, S_IFDIR); |
| 2369 | |
| 2370 | return ext4_next_entry(de, blocksize); |
| 2371 | } |
| 2372 | |
| 2373 | static int ext4_init_new_dir(handle_t *handle, struct inode *dir, |
| 2374 | struct inode *inode) |
| 2375 | { |
Namhyung Kim | dabd991 | 2011-01-10 12:11:16 -0500 | [diff] [blame] | 2376 | struct buffer_head *dir_block = NULL; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2377 | struct ext4_dir_entry_2 *de; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 2378 | struct ext4_dir_entry_tail *t; |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 2379 | ext4_lblk_t block = 0; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2380 | unsigned int blocksize = dir->i_sb->s_blocksize; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 2381 | int csum_size = 0; |
Tao Ma | a774f9c | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2382 | int err; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2383 | |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 2384 | if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb, |
| 2385 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 2386 | csum_size = sizeof(struct ext4_dir_entry_tail); |
| 2387 | |
Tao Ma | 3c47d54 | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 2388 | if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) { |
| 2389 | err = ext4_try_create_inline_dir(handle, dir, inode); |
| 2390 | if (err < 0 && err != -ENOSPC) |
| 2391 | goto out; |
| 2392 | if (!err) |
| 2393 | goto out; |
| 2394 | } |
| 2395 | |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 2396 | inode->i_size = 0; |
Theodore Ts'o | 0f70b40 | 2013-02-15 03:35:57 -0500 | [diff] [blame] | 2397 | dir_block = ext4_append(handle, inode, &block); |
| 2398 | if (IS_ERR(dir_block)) |
| 2399 | return PTR_ERR(dir_block); |
Tao Ma | a774f9c | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2400 | BUFFER_TRACE(dir_block, "get_write_access"); |
| 2401 | err = ext4_journal_get_write_access(handle, dir_block); |
| 2402 | if (err) |
| 2403 | goto out; |
| 2404 | de = (struct ext4_dir_entry_2 *)dir_block->b_data; |
| 2405 | ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0); |
| 2406 | set_nlink(inode, 2); |
| 2407 | if (csum_size) { |
| 2408 | t = EXT4_DIRENT_TAIL(dir_block->b_data, blocksize); |
| 2409 | initialize_dirent_tail(t, blocksize); |
| 2410 | } |
| 2411 | |
| 2412 | BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata"); |
| 2413 | err = ext4_handle_dirty_dirent_node(handle, inode, dir_block); |
| 2414 | if (err) |
| 2415 | goto out; |
| 2416 | set_buffer_verified(dir_block); |
| 2417 | out: |
| 2418 | brelse(dir_block); |
| 2419 | return err; |
| 2420 | } |
| 2421 | |
| 2422 | static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
| 2423 | { |
| 2424 | handle_t *handle; |
| 2425 | struct inode *inode; |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2426 | int err, credits, retries = 0; |
Tao Ma | a774f9c | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2427 | |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2428 | if (EXT4_DIR_LINK_MAX(dir)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2429 | return -EMLINK; |
| 2430 | |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 2431 | dquot_initialize(dir); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 2432 | |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2433 | credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
Jan Kara | eb9cc7e | 2013-04-19 13:38:14 -0400 | [diff] [blame] | 2434 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2435 | retry: |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2436 | inode = ext4_new_inode_start_handle(dir, S_IFDIR | mode, |
| 2437 | &dentry->d_name, |
| 2438 | 0, NULL, EXT4_HT_DIR, credits); |
| 2439 | handle = ext4_journal_current_handle(); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2440 | err = PTR_ERR(inode); |
| 2441 | if (IS_ERR(inode)) |
| 2442 | goto out_stop; |
| 2443 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2444 | inode->i_op = &ext4_dir_inode_operations; |
| 2445 | inode->i_fop = &ext4_dir_operations; |
Tao Ma | a774f9c | 2012-12-10 14:05:57 -0500 | [diff] [blame] | 2446 | err = ext4_init_new_dir(handle, dir, inode); |
Namhyung Kim | dabd991 | 2011-01-10 12:11:16 -0500 | [diff] [blame] | 2447 | if (err) |
| 2448 | goto out_clear_inode; |
Namhyung Kim | dabd991 | 2011-01-10 12:11:16 -0500 | [diff] [blame] | 2449 | err = ext4_mark_inode_dirty(handle, inode); |
| 2450 | if (!err) |
| 2451 | err = ext4_add_entry(handle, dentry, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2452 | if (err) { |
Aneesh Kumar K.V | 4cdeed8 | 2008-02-22 06:17:31 -0500 | [diff] [blame] | 2453 | out_clear_inode: |
| 2454 | clear_nlink(inode); |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 2455 | unlock_new_inode(inode); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2456 | ext4_mark_inode_dirty(handle, inode); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2457 | iput(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2458 | goto out_stop; |
| 2459 | } |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2460 | ext4_inc_count(handle, dir); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2461 | ext4_update_dx_flag(dir); |
Namhyung Kim | dabd991 | 2011-01-10 12:11:16 -0500 | [diff] [blame] | 2462 | err = ext4_mark_inode_dirty(handle, dir); |
| 2463 | if (err) |
| 2464 | goto out_clear_inode; |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 2465 | unlock_new_inode(inode); |
Al Viro | 8fc37ec | 2012-07-19 09:18:15 +0400 | [diff] [blame] | 2466 | d_instantiate(dentry, inode); |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2467 | if (IS_DIRSYNC(dir)) |
| 2468 | ext4_handle_sync(handle); |
| 2469 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2470 | out_stop: |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2471 | if (handle) |
| 2472 | ext4_journal_stop(handle); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2473 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2474 | goto retry; |
| 2475 | return err; |
| 2476 | } |
| 2477 | |
| 2478 | /* |
| 2479 | * routine to check that the specified directory is empty (for rmdir) |
| 2480 | */ |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2481 | static int empty_dir(struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2482 | { |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 2483 | unsigned int offset; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2484 | struct buffer_head *bh; |
| 2485 | struct ext4_dir_entry_2 *de, *de1; |
| 2486 | struct super_block *sb; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2487 | int err = 0; |
| 2488 | |
Tao Ma | 61f8663 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 2489 | if (ext4_has_inline_data(inode)) { |
| 2490 | int has_inline_data = 1; |
| 2491 | |
| 2492 | err = empty_inline_dir(inode, &has_inline_data); |
| 2493 | if (has_inline_data) |
| 2494 | return err; |
| 2495 | } |
| 2496 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2497 | sb = inode->i_sb; |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 2498 | if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2)) { |
| 2499 | EXT4_ERROR_INODE(inode, "invalid size"); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2500 | return 1; |
| 2501 | } |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 2502 | bh = ext4_read_dirblock(inode, 0, EITHER); |
| 2503 | if (IS_ERR(bh)) |
| 2504 | return 1; |
| 2505 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2506 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2507 | de1 = ext4_next_entry(de, sb->s_blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2508 | if (le32_to_cpu(de->inode) != inode->i_ino || |
| 2509 | !le32_to_cpu(de1->inode) || |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2510 | strcmp(".", de->name) || |
| 2511 | strcmp("..", de1->name)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 2512 | ext4_warning(inode->i_sb, |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2513 | "bad directory (dir #%lu) - no `.' or `..'", |
| 2514 | inode->i_ino); |
| 2515 | brelse(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2516 | return 1; |
| 2517 | } |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2518 | offset = ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) + |
| 2519 | ext4_rec_len_from_disk(de1->rec_len, sb->s_blocksize); |
| 2520 | de = ext4_next_entry(de1, sb->s_blocksize); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2521 | while (offset < inode->i_size) { |
Dmitry Monakhov | 236f5ec | 2014-04-21 14:38:14 -0400 | [diff] [blame] | 2522 | if ((void *) de >= (void *) (bh->b_data+sb->s_blocksize)) { |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 2523 | unsigned int lblock; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2524 | err = 0; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2525 | brelse(bh); |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 2526 | lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb); |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 2527 | bh = ext4_read_dirblock(inode, lblock, EITHER); |
| 2528 | if (IS_ERR(bh)) |
| 2529 | return 1; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2530 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2531 | } |
Tao Ma | 226ba97 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 2532 | if (ext4_check_dir_entry(inode, NULL, de, bh, |
| 2533 | bh->b_data, bh->b_size, offset)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2534 | de = (struct ext4_dir_entry_2 *)(bh->b_data + |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2535 | sb->s_blocksize); |
| 2536 | offset = (offset | (sb->s_blocksize - 1)) + 1; |
| 2537 | continue; |
| 2538 | } |
| 2539 | if (le32_to_cpu(de->inode)) { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2540 | brelse(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2541 | return 0; |
| 2542 | } |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 2543 | offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize); |
| 2544 | de = ext4_next_entry(de, sb->s_blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2545 | } |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2546 | brelse(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2547 | return 1; |
| 2548 | } |
| 2549 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2550 | /* |
| 2551 | * 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] | 2552 | * such inodes, starting at the superblock, in case we crash before the |
| 2553 | * file is closed/deleted, or in case the inode truncate spans multiple |
| 2554 | * transactions and the last transaction is not recovered after a crash. |
| 2555 | * |
| 2556 | * At filesystem recovery time, we walk this list deleting unlinked |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2557 | * inodes and truncating linked inodes in ext4_orphan_cleanup(). |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2558 | * |
| 2559 | * Orphan list manipulation functions must be called under i_mutex unless |
| 2560 | * we are just creating the inode or deleting it. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2561 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2562 | int ext4_orphan_add(handle_t *handle, struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2563 | { |
| 2564 | struct super_block *sb = inode->i_sb; |
Jan Kara | cd2c080 | 2014-05-26 11:39:17 -0400 | [diff] [blame] | 2565 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2566 | struct ext4_iloc iloc; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2567 | int err = 0, rc; |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2568 | bool dirty = false; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2569 | |
Jan Kara | cd2c080 | 2014-05-26 11:39:17 -0400 | [diff] [blame] | 2570 | if (!sbi->s_journal) |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 2571 | return 0; |
| 2572 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2573 | WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) && |
| 2574 | !mutex_is_locked(&inode->i_mutex)); |
| 2575 | /* |
| 2576 | * Exit early if inode already is on orphan list. This is a big speedup |
| 2577 | * since we don't have to contend on the global s_orphan_lock. |
| 2578 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2579 | if (!list_empty(&EXT4_I(inode)->i_orphan)) |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2580 | return 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2581 | |
Lukas Czerner | afb8617 | 2011-07-11 18:47:04 -0400 | [diff] [blame] | 2582 | /* |
| 2583 | * Orphan handling is only valid for files with data blocks |
| 2584 | * being truncated, or files being unlinked. Note that we either |
| 2585 | * hold i_mutex, or the inode can not be referenced from outside, |
| 2586 | * so i_nlink should not be bumped due to race |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2587 | */ |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2588 | J_ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
| 2589 | S_ISLNK(inode->i_mode)) || inode->i_nlink == 0); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2590 | |
Jan Kara | cd2c080 | 2014-05-26 11:39:17 -0400 | [diff] [blame] | 2591 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
| 2592 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2593 | if (err) |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2594 | goto out; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2595 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2596 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2597 | if (err) |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2598 | goto out; |
| 2599 | |
| 2600 | mutex_lock(&sbi->s_orphan_lock); |
Dmitry Monakhov | 6e3617e | 2010-03-01 23:29:39 -0500 | [diff] [blame] | 2601 | /* |
| 2602 | * Due to previous errors inode may be already a part of on-disk |
| 2603 | * orphan list. If so skip on-disk list modification. |
| 2604 | */ |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2605 | if (!NEXT_ORPHAN(inode) || NEXT_ORPHAN(inode) > |
| 2606 | (le32_to_cpu(sbi->s_es->s_inodes_count))) { |
| 2607 | /* Insert this inode at the head of the on-disk orphan list */ |
| 2608 | NEXT_ORPHAN(inode) = le32_to_cpu(sbi->s_es->s_last_orphan); |
| 2609 | sbi->s_es->s_last_orphan = cpu_to_le32(inode->i_ino); |
| 2610 | dirty = true; |
| 2611 | } |
| 2612 | list_add(&EXT4_I(inode)->i_orphan, &sbi->s_orphan); |
| 2613 | mutex_unlock(&sbi->s_orphan_lock); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2614 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2615 | if (dirty) { |
| 2616 | err = ext4_handle_dirty_super(handle, sb); |
| 2617 | rc = ext4_mark_iloc_dirty(handle, inode, &iloc); |
| 2618 | if (!err) |
| 2619 | err = rc; |
| 2620 | if (err) { |
| 2621 | /* |
| 2622 | * We have to remove inode from in-memory list if |
| 2623 | * addition to on disk orphan list failed. Stray orphan |
| 2624 | * list entries can cause panics at unmount time. |
| 2625 | */ |
| 2626 | mutex_lock(&sbi->s_orphan_lock); |
| 2627 | list_del(&EXT4_I(inode)->i_orphan); |
| 2628 | mutex_unlock(&sbi->s_orphan_lock); |
| 2629 | } |
| 2630 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2631 | jbd_debug(4, "superblock will point to %lu\n", inode->i_ino); |
| 2632 | jbd_debug(4, "orphan inode %lu will point to %d\n", |
| 2633 | inode->i_ino, NEXT_ORPHAN(inode)); |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2634 | out: |
Jan Kara | cd2c080 | 2014-05-26 11:39:17 -0400 | [diff] [blame] | 2635 | ext4_std_error(sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2636 | return err; |
| 2637 | } |
| 2638 | |
| 2639 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2640 | * ext4_orphan_del() removes an unlinked or truncated inode from the list |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2641 | * of such inodes stored on disk, because it is finally being cleaned up. |
| 2642 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2643 | int ext4_orphan_del(handle_t *handle, struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2644 | { |
| 2645 | struct list_head *prev; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2646 | struct ext4_inode_info *ei = EXT4_I(inode); |
Jan Kara | cd2c080 | 2014-05-26 11:39:17 -0400 | [diff] [blame] | 2647 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 2648 | __u32 ino_next; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2649 | struct ext4_iloc iloc; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2650 | int err = 0; |
| 2651 | |
Jan Kara | cd2c080 | 2014-05-26 11:39:17 -0400 | [diff] [blame] | 2652 | if (!sbi->s_journal && !(sbi->s_mount_state & EXT4_ORPHAN_FS)) |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 2653 | return 0; |
| 2654 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2655 | WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) && |
| 2656 | !mutex_is_locked(&inode->i_mutex)); |
| 2657 | /* Do this quick check before taking global s_orphan_lock. */ |
Theodore Ts'o | 3b9d4ed | 2009-04-25 22:54:04 -0400 | [diff] [blame] | 2658 | if (list_empty(&ei->i_orphan)) |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2659 | return 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2660 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2661 | if (handle) { |
| 2662 | /* Grab inode buffer early before taking global s_orphan_lock */ |
| 2663 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
| 2664 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2665 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2666 | mutex_lock(&sbi->s_orphan_lock); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2667 | jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino); |
| 2668 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2669 | prev = ei->i_orphan.prev; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2670 | list_del_init(&ei->i_orphan); |
| 2671 | |
| 2672 | /* If we're on an error path, we may not have a valid |
| 2673 | * transaction handle with which to update the orphan list on |
| 2674 | * disk, but we still need to remove the inode from the linked |
| 2675 | * list in memory. */ |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2676 | if (!handle || err) { |
| 2677 | mutex_unlock(&sbi->s_orphan_lock); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2678 | goto out_err; |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2679 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2680 | |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2681 | ino_next = NEXT_ORPHAN(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2682 | if (prev == &sbi->s_orphan) { |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 2683 | jbd_debug(4, "superblock will point to %u\n", ino_next); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2684 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2685 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2686 | if (err) { |
| 2687 | mutex_unlock(&sbi->s_orphan_lock); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2688 | goto out_brelse; |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2689 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2690 | sbi->s_es->s_last_orphan = cpu_to_le32(ino_next); |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2691 | mutex_unlock(&sbi->s_orphan_lock); |
Artem Bityutskiy | b50924c | 2012-07-22 20:37:31 -0400 | [diff] [blame] | 2692 | err = ext4_handle_dirty_super(handle, inode->i_sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2693 | } else { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2694 | struct ext4_iloc iloc2; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2695 | struct inode *i_prev = |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2696 | &list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2697 | |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 2698 | jbd_debug(4, "orphan inode %lu will point to %u\n", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2699 | i_prev->i_ino, ino_next); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2700 | err = ext4_reserve_inode_write(handle, i_prev, &iloc2); |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2701 | if (err) { |
| 2702 | mutex_unlock(&sbi->s_orphan_lock); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2703 | goto out_brelse; |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2704 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2705 | NEXT_ORPHAN(i_prev) = ino_next; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2706 | err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2); |
Jan Kara | d745a8c | 2014-05-26 11:56:53 -0400 | [diff] [blame] | 2707 | mutex_unlock(&sbi->s_orphan_lock); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2708 | } |
| 2709 | if (err) |
| 2710 | goto out_brelse; |
| 2711 | NEXT_ORPHAN(inode) = 0; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2712 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2713 | out_err: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2714 | ext4_std_error(inode->i_sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2715 | return err; |
| 2716 | |
| 2717 | out_brelse: |
| 2718 | brelse(iloc.bh); |
| 2719 | goto out_err; |
| 2720 | } |
| 2721 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2722 | static int ext4_rmdir(struct inode *dir, struct dentry *dentry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2723 | { |
| 2724 | int retval; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2725 | struct inode *inode; |
| 2726 | struct buffer_head *bh; |
| 2727 | struct ext4_dir_entry_2 *de; |
Theodore Ts'o | 8dcfaad | 2013-02-09 09:45:11 -0500 | [diff] [blame] | 2728 | handle_t *handle = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2729 | |
| 2730 | /* Initialize quotas before so that eventual writes go in |
| 2731 | * separate transaction */ |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 2732 | dquot_initialize(dir); |
| 2733 | dquot_initialize(dentry->d_inode); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 2734 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2735 | retval = -ENOENT; |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 2736 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 2737 | if (IS_ERR(bh)) |
| 2738 | return PTR_ERR(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2739 | if (!bh) |
| 2740 | goto end_rmdir; |
| 2741 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2742 | inode = dentry->d_inode; |
| 2743 | |
| 2744 | retval = -EIO; |
| 2745 | if (le32_to_cpu(de->inode) != inode->i_ino) |
| 2746 | goto end_rmdir; |
| 2747 | |
| 2748 | retval = -ENOTEMPTY; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2749 | if (!empty_dir(inode)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2750 | goto end_rmdir; |
| 2751 | |
Theodore Ts'o | 8dcfaad | 2013-02-09 09:45:11 -0500 | [diff] [blame] | 2752 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
Theodore Ts'o | 64044ab | 2013-02-09 15:06:24 -0500 | [diff] [blame] | 2753 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb)); |
Theodore Ts'o | 8dcfaad | 2013-02-09 09:45:11 -0500 | [diff] [blame] | 2754 | if (IS_ERR(handle)) { |
| 2755 | retval = PTR_ERR(handle); |
| 2756 | handle = NULL; |
| 2757 | goto end_rmdir; |
| 2758 | } |
| 2759 | |
| 2760 | if (IS_DIRSYNC(dir)) |
| 2761 | ext4_handle_sync(handle); |
| 2762 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2763 | retval = ext4_delete_entry(handle, dir, de, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2764 | if (retval) |
| 2765 | goto end_rmdir; |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2766 | if (!EXT4_DIR_LINK_EMPTY(inode)) |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 2767 | ext4_warning(inode->i_sb, |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2768 | "empty directory has too many links (%d)", |
| 2769 | inode->i_nlink); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2770 | inode->i_version++; |
| 2771 | clear_nlink(inode); |
| 2772 | /* There's no need to set i_disksize: the fact that i_nlink is |
| 2773 | * zero will ensure that the right thing happens during any |
| 2774 | * recovery. */ |
| 2775 | inode->i_size = 0; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2776 | ext4_orphan_add(handle, inode); |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 2777 | 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] | 2778 | ext4_mark_inode_dirty(handle, inode); |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2779 | ext4_dec_count(handle, dir); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2780 | ext4_update_dx_flag(dir); |
| 2781 | ext4_mark_inode_dirty(handle, dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2782 | |
| 2783 | end_rmdir: |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2784 | brelse(bh); |
Theodore Ts'o | 8dcfaad | 2013-02-09 09:45:11 -0500 | [diff] [blame] | 2785 | if (handle) |
| 2786 | ext4_journal_stop(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2787 | return retval; |
| 2788 | } |
| 2789 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2790 | static int ext4_unlink(struct inode *dir, struct dentry *dentry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2791 | { |
| 2792 | int retval; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2793 | struct inode *inode; |
| 2794 | struct buffer_head *bh; |
| 2795 | struct ext4_dir_entry_2 *de; |
Theodore Ts'o | 931b686 | 2013-02-09 09:43:39 -0500 | [diff] [blame] | 2796 | handle_t *handle = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2797 | |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 2798 | trace_ext4_unlink_enter(dir, dentry); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2799 | /* Initialize quotas before so that eventual writes go |
| 2800 | * in separate transaction */ |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 2801 | dquot_initialize(dir); |
| 2802 | dquot_initialize(dentry->d_inode); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 2803 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2804 | retval = -ENOENT; |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 2805 | bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 2806 | if (IS_ERR(bh)) |
| 2807 | return PTR_ERR(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2808 | if (!bh) |
| 2809 | goto end_unlink; |
| 2810 | |
| 2811 | inode = dentry->d_inode; |
| 2812 | |
| 2813 | retval = -EIO; |
| 2814 | if (le32_to_cpu(de->inode) != inode->i_ino) |
| 2815 | goto end_unlink; |
| 2816 | |
Theodore Ts'o | 931b686 | 2013-02-09 09:43:39 -0500 | [diff] [blame] | 2817 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
Theodore Ts'o | 64044ab | 2013-02-09 15:06:24 -0500 | [diff] [blame] | 2818 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb)); |
Theodore Ts'o | 931b686 | 2013-02-09 09:43:39 -0500 | [diff] [blame] | 2819 | if (IS_ERR(handle)) { |
| 2820 | retval = PTR_ERR(handle); |
| 2821 | handle = NULL; |
| 2822 | goto end_unlink; |
| 2823 | } |
| 2824 | |
| 2825 | if (IS_DIRSYNC(dir)) |
| 2826 | ext4_handle_sync(handle); |
| 2827 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2828 | if (!inode->i_nlink) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 2829 | ext4_warning(inode->i_sb, |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2830 | "Deleting nonexistent file (%lu), %d", |
| 2831 | inode->i_ino, inode->i_nlink); |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 2832 | set_nlink(inode, 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2833 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2834 | retval = ext4_delete_entry(handle, dir, de, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2835 | if (retval) |
| 2836 | goto end_unlink; |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 2837 | dir->i_ctime = dir->i_mtime = ext4_current_time(dir); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2838 | ext4_update_dx_flag(dir); |
| 2839 | ext4_mark_inode_dirty(handle, dir); |
Theodore Ts'o | 825f148 | 2008-02-15 15:00:38 -0500 | [diff] [blame] | 2840 | drop_nlink(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2841 | if (!inode->i_nlink) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2842 | ext4_orphan_add(handle, inode); |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 2843 | inode->i_ctime = ext4_current_time(inode); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2844 | ext4_mark_inode_dirty(handle, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2845 | retval = 0; |
| 2846 | |
| 2847 | end_unlink: |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2848 | brelse(bh); |
Theodore Ts'o | 931b686 | 2013-02-09 09:43:39 -0500 | [diff] [blame] | 2849 | if (handle) |
| 2850 | ext4_journal_stop(handle); |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 2851 | trace_ext4_unlink_exit(dentry, retval); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2852 | return retval; |
| 2853 | } |
| 2854 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2855 | static int ext4_symlink(struct inode *dir, |
| 2856 | struct dentry *dentry, const char *symname) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2857 | { |
| 2858 | handle_t *handle; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2859 | struct inode *inode; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2860 | int l, err, retries = 0; |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 2861 | int credits; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2862 | |
| 2863 | l = strlen(symname)+1; |
| 2864 | if (l > dir->i_sb->s_blocksize) |
| 2865 | return -ENAMETOOLONG; |
| 2866 | |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 2867 | dquot_initialize(dir); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 2868 | |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 2869 | if (l > EXT4_N_BLOCKS * 4) { |
| 2870 | /* |
| 2871 | * For non-fast symlinks, we just allocate inode and put it on |
| 2872 | * orphan list in the first transaction => we need bitmap, |
Eric Sandeen | 8c20871 | 2011-08-11 09:54:31 -0500 | [diff] [blame] | 2873 | * group descriptor, sb, inode block, quota blocks, and |
| 2874 | * possibly selinux xattr blocks. |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 2875 | */ |
Eric Sandeen | 8c20871 | 2011-08-11 09:54:31 -0500 | [diff] [blame] | 2876 | credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) + |
| 2877 | EXT4_XATTR_TRANS_BLOCKS; |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 2878 | } else { |
| 2879 | /* |
| 2880 | * Fast symlink. We have to add entry to directory |
| 2881 | * (EXT4_DATA_TRANS_BLOCKS + EXT4_INDEX_EXTRA_TRANS_BLOCKS), |
| 2882 | * allocate new inode (bitmap, group descriptor, inode block, |
| 2883 | * quota blocks, sb is already counted in previous macros). |
| 2884 | */ |
| 2885 | credits = EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
Jan Kara | eb9cc7e | 2013-04-19 13:38:14 -0400 | [diff] [blame] | 2886 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3; |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 2887 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2888 | retry: |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2889 | inode = ext4_new_inode_start_handle(dir, S_IFLNK|S_IRWXUGO, |
| 2890 | &dentry->d_name, 0, NULL, |
| 2891 | EXT4_HT_DIR, credits); |
| 2892 | handle = ext4_journal_current_handle(); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2893 | err = PTR_ERR(inode); |
| 2894 | if (IS_ERR(inode)) |
| 2895 | goto out_stop; |
| 2896 | |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 2897 | if (l > EXT4_N_BLOCKS * 4) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2898 | inode->i_op = &ext4_symlink_inode_operations; |
| 2899 | ext4_set_aops(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2900 | /* |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 2901 | * We cannot call page_symlink() with transaction started |
| 2902 | * because it calls into ext4_write_begin() which can wait |
| 2903 | * for transaction commit if we are running out of space |
| 2904 | * and thus we deadlock. So we have to stop transaction now |
| 2905 | * and restart it when symlink contents is written. |
| 2906 | * |
| 2907 | * To keep fs consistent in case of crash, we have to put inode |
| 2908 | * to orphan list in the mean time. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2909 | */ |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 2910 | drop_nlink(inode); |
| 2911 | err = ext4_orphan_add(handle, inode); |
| 2912 | ext4_journal_stop(handle); |
| 2913 | if (err) |
| 2914 | goto err_drop_inode; |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 2915 | err = __page_symlink(inode, symname, l, 1); |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 2916 | if (err) |
| 2917 | goto err_drop_inode; |
| 2918 | /* |
| 2919 | * Now inode is being linked into dir (EXT4_DATA_TRANS_BLOCKS |
| 2920 | * + EXT4_INDEX_EXTRA_TRANS_BLOCKS), inode is also modified |
| 2921 | */ |
Theodore Ts'o | 9924a92 | 2013-02-08 21:59:22 -0500 | [diff] [blame] | 2922 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 2923 | EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
| 2924 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 1); |
| 2925 | if (IS_ERR(handle)) { |
| 2926 | err = PTR_ERR(handle); |
| 2927 | goto err_drop_inode; |
| 2928 | } |
Al Viro | 0ce8c010 | 2012-01-08 19:50:23 -0500 | [diff] [blame] | 2929 | set_nlink(inode, 1); |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 2930 | err = ext4_orphan_del(handle, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2931 | if (err) { |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 2932 | ext4_journal_stop(handle); |
Theodore Ts'o | 825f148 | 2008-02-15 15:00:38 -0500 | [diff] [blame] | 2933 | clear_nlink(inode); |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 2934 | goto err_drop_inode; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2935 | } |
| 2936 | } else { |
Aneesh Kumar K.V | e65187e | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 2937 | /* clear the extent format for fast symlink */ |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 2938 | ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2939 | inode->i_op = &ext4_fast_symlink_inode_operations; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2940 | memcpy((char *)&EXT4_I(inode)->i_data, symname, l); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2941 | inode->i_size = l-1; |
| 2942 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2943 | EXT4_I(inode)->i_disksize = inode->i_size; |
| 2944 | err = ext4_add_nondir(handle, dentry, inode); |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2945 | if (!err && IS_DIRSYNC(dir)) |
| 2946 | ext4_handle_sync(handle); |
| 2947 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2948 | out_stop: |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 2949 | if (handle) |
| 2950 | ext4_journal_stop(handle); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2951 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2952 | goto retry; |
| 2953 | return err; |
Jan Kara | df5e622 | 2011-05-03 11:12:58 -0400 | [diff] [blame] | 2954 | err_drop_inode: |
| 2955 | unlock_new_inode(inode); |
| 2956 | iput(inode); |
| 2957 | return err; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2958 | } |
| 2959 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 2960 | static int ext4_link(struct dentry *old_dentry, |
| 2961 | struct inode *dir, struct dentry *dentry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2962 | { |
| 2963 | handle_t *handle; |
| 2964 | struct inode *inode = old_dentry->d_inode; |
| 2965 | int err, retries = 0; |
| 2966 | |
Theodore Ts'o | b05ab1d | 2009-08-29 21:08:08 -0400 | [diff] [blame] | 2967 | if (inode->i_nlink >= EXT4_LINK_MAX) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2968 | return -EMLINK; |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2969 | |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 2970 | dquot_initialize(dir); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 2971 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2972 | retry: |
Theodore Ts'o | 9924a92 | 2013-02-08 21:59:22 -0500 | [diff] [blame] | 2973 | handle = ext4_journal_start(dir, EXT4_HT_DIR, |
| 2974 | (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2975 | EXT4_INDEX_EXTRA_TRANS_BLOCKS) + 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2976 | if (IS_ERR(handle)) |
| 2977 | return PTR_ERR(handle); |
| 2978 | |
| 2979 | if (IS_DIRSYNC(dir)) |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 2980 | ext4_handle_sync(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2981 | |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 2982 | inode->i_ctime = ext4_current_time(inode); |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 2983 | ext4_inc_count(handle, inode); |
Al Viro | 7de9c6ee | 2010-10-23 11:11:40 -0400 | [diff] [blame] | 2984 | ihold(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2985 | |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 2986 | err = ext4_add_entry(handle, dentry, inode); |
| 2987 | if (!err) { |
| 2988 | ext4_mark_inode_dirty(handle, inode); |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 2989 | /* this can happen only for tmpfile being |
| 2990 | * linked the first time |
| 2991 | */ |
| 2992 | if (inode->i_nlink == 1) |
| 2993 | ext4_orphan_del(handle, inode); |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 2994 | d_instantiate(dentry, inode); |
| 2995 | } else { |
| 2996 | drop_nlink(inode); |
| 2997 | iput(inode); |
| 2998 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2999 | ext4_journal_stop(handle); |
| 3000 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3001 | goto retry; |
| 3002 | return err; |
| 3003 | } |
| 3004 | |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 3005 | |
| 3006 | /* |
| 3007 | * Try to find buffer head where contains the parent block. |
| 3008 | * It should be the inode block if it is inlined or the 1st block |
| 3009 | * if it is a normal dir. |
| 3010 | */ |
| 3011 | static struct buffer_head *ext4_get_first_dir_block(handle_t *handle, |
| 3012 | struct inode *inode, |
| 3013 | int *retval, |
| 3014 | struct ext4_dir_entry_2 **parent_de, |
| 3015 | int *inlined) |
| 3016 | { |
| 3017 | struct buffer_head *bh; |
| 3018 | |
| 3019 | if (!ext4_has_inline_data(inode)) { |
Theodore Ts'o | dc6982f | 2013-02-14 23:59:26 -0500 | [diff] [blame] | 3020 | bh = ext4_read_dirblock(inode, 0, EITHER); |
| 3021 | if (IS_ERR(bh)) { |
| 3022 | *retval = PTR_ERR(bh); |
Tao Ma | 32f7f22 | 2012-12-10 14:06:01 -0500 | [diff] [blame] | 3023 | return NULL; |
| 3024 | } |
| 3025 | *parent_de = ext4_next_entry( |
| 3026 | (struct ext4_dir_entry_2 *)bh->b_data, |
| 3027 | inode->i_sb->s_blocksize); |
| 3028 | return bh; |
| 3029 | } |
| 3030 | |
| 3031 | *inlined = 1; |
| 3032 | return ext4_get_first_inline_block(inode, parent_de, retval); |
| 3033 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3034 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3035 | struct ext4_renament { |
| 3036 | struct inode *dir; |
| 3037 | struct dentry *dentry; |
| 3038 | struct inode *inode; |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3039 | bool is_dir; |
| 3040 | int dir_nlink_delta; |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3041 | |
| 3042 | /* entry for "dentry" */ |
| 3043 | struct buffer_head *bh; |
| 3044 | struct ext4_dir_entry_2 *de; |
| 3045 | int inlined; |
| 3046 | |
| 3047 | /* entry for ".." in inode if it's a directory */ |
| 3048 | struct buffer_head *dir_bh; |
| 3049 | struct ext4_dir_entry_2 *parent_de; |
| 3050 | int dir_inlined; |
| 3051 | }; |
| 3052 | |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3053 | static int ext4_rename_dir_prepare(handle_t *handle, struct ext4_renament *ent) |
| 3054 | { |
| 3055 | int retval; |
| 3056 | |
| 3057 | ent->dir_bh = ext4_get_first_dir_block(handle, ent->inode, |
| 3058 | &retval, &ent->parent_de, |
| 3059 | &ent->dir_inlined); |
| 3060 | if (!ent->dir_bh) |
| 3061 | return retval; |
| 3062 | if (le32_to_cpu(ent->parent_de->inode) != ent->dir->i_ino) |
| 3063 | return -EIO; |
| 3064 | BUFFER_TRACE(ent->dir_bh, "get_write_access"); |
| 3065 | return ext4_journal_get_write_access(handle, ent->dir_bh); |
| 3066 | } |
| 3067 | |
| 3068 | static int ext4_rename_dir_finish(handle_t *handle, struct ext4_renament *ent, |
| 3069 | unsigned dir_ino) |
| 3070 | { |
| 3071 | int retval; |
| 3072 | |
| 3073 | ent->parent_de->inode = cpu_to_le32(dir_ino); |
| 3074 | BUFFER_TRACE(ent->dir_bh, "call ext4_handle_dirty_metadata"); |
| 3075 | if (!ent->dir_inlined) { |
| 3076 | if (is_dx(ent->inode)) { |
| 3077 | retval = ext4_handle_dirty_dx_node(handle, |
| 3078 | ent->inode, |
| 3079 | ent->dir_bh); |
| 3080 | } else { |
| 3081 | retval = ext4_handle_dirty_dirent_node(handle, |
| 3082 | ent->inode, |
| 3083 | ent->dir_bh); |
| 3084 | } |
| 3085 | } else { |
| 3086 | retval = ext4_mark_inode_dirty(handle, ent->inode); |
| 3087 | } |
| 3088 | if (retval) { |
| 3089 | ext4_std_error(ent->dir->i_sb, retval); |
| 3090 | return retval; |
| 3091 | } |
| 3092 | return 0; |
| 3093 | } |
| 3094 | |
| 3095 | static int ext4_setent(handle_t *handle, struct ext4_renament *ent, |
| 3096 | unsigned ino, unsigned file_type) |
| 3097 | { |
| 3098 | int retval; |
| 3099 | |
| 3100 | BUFFER_TRACE(ent->bh, "get write access"); |
| 3101 | retval = ext4_journal_get_write_access(handle, ent->bh); |
| 3102 | if (retval) |
| 3103 | return retval; |
| 3104 | ent->de->inode = cpu_to_le32(ino); |
| 3105 | if (EXT4_HAS_INCOMPAT_FEATURE(ent->dir->i_sb, |
| 3106 | EXT4_FEATURE_INCOMPAT_FILETYPE)) |
| 3107 | ent->de->file_type = file_type; |
| 3108 | ent->dir->i_version++; |
| 3109 | ent->dir->i_ctime = ent->dir->i_mtime = |
| 3110 | ext4_current_time(ent->dir); |
| 3111 | ext4_mark_inode_dirty(handle, ent->dir); |
| 3112 | BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata"); |
| 3113 | if (!ent->inlined) { |
| 3114 | retval = ext4_handle_dirty_dirent_node(handle, |
| 3115 | ent->dir, ent->bh); |
| 3116 | if (unlikely(retval)) { |
| 3117 | ext4_std_error(ent->dir->i_sb, retval); |
| 3118 | return retval; |
| 3119 | } |
| 3120 | } |
| 3121 | brelse(ent->bh); |
| 3122 | ent->bh = NULL; |
| 3123 | |
| 3124 | return 0; |
| 3125 | } |
| 3126 | |
| 3127 | static int ext4_find_delete_entry(handle_t *handle, struct inode *dir, |
| 3128 | const struct qstr *d_name) |
| 3129 | { |
| 3130 | int retval = -ENOENT; |
| 3131 | struct buffer_head *bh; |
| 3132 | struct ext4_dir_entry_2 *de; |
| 3133 | |
| 3134 | bh = ext4_find_entry(dir, d_name, &de, NULL); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 3135 | if (IS_ERR(bh)) |
| 3136 | return PTR_ERR(bh); |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3137 | if (bh) { |
| 3138 | retval = ext4_delete_entry(handle, dir, de, bh); |
| 3139 | brelse(bh); |
| 3140 | } |
| 3141 | return retval; |
| 3142 | } |
| 3143 | |
Darrick J. Wong | d80d448 | 2014-08-27 18:40:09 -0400 | [diff] [blame] | 3144 | static void ext4_rename_delete(handle_t *handle, struct ext4_renament *ent, |
| 3145 | int force_reread) |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3146 | { |
| 3147 | int retval; |
| 3148 | /* |
| 3149 | * ent->de could have moved from under us during htree split, so make |
| 3150 | * sure that we are deleting the right entry. We might also be pointing |
| 3151 | * to a stale entry in the unused part of ent->bh so just checking inum |
| 3152 | * and the name isn't enough. |
| 3153 | */ |
| 3154 | if (le32_to_cpu(ent->de->inode) != ent->inode->i_ino || |
| 3155 | ent->de->name_len != ent->dentry->d_name.len || |
| 3156 | strncmp(ent->de->name, ent->dentry->d_name.name, |
Darrick J. Wong | d80d448 | 2014-08-27 18:40:09 -0400 | [diff] [blame] | 3157 | ent->de->name_len) || |
| 3158 | force_reread) { |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3159 | retval = ext4_find_delete_entry(handle, ent->dir, |
| 3160 | &ent->dentry->d_name); |
| 3161 | } else { |
| 3162 | retval = ext4_delete_entry(handle, ent->dir, ent->de, ent->bh); |
| 3163 | if (retval == -ENOENT) { |
| 3164 | retval = ext4_find_delete_entry(handle, ent->dir, |
| 3165 | &ent->dentry->d_name); |
| 3166 | } |
| 3167 | } |
| 3168 | |
| 3169 | if (retval) { |
| 3170 | ext4_warning(ent->dir->i_sb, |
| 3171 | "Deleting old file (%lu), %d, error=%d", |
| 3172 | ent->dir->i_ino, ent->dir->i_nlink, retval); |
| 3173 | } |
| 3174 | } |
| 3175 | |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3176 | static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent) |
| 3177 | { |
| 3178 | if (ent->dir_nlink_delta) { |
| 3179 | if (ent->dir_nlink_delta == -1) |
| 3180 | ext4_dec_count(handle, ent->dir); |
| 3181 | else |
| 3182 | ext4_inc_count(handle, ent->dir); |
| 3183 | ext4_mark_inode_dirty(handle, ent->dir); |
| 3184 | } |
| 3185 | } |
| 3186 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3187 | /* |
| 3188 | * Anybody can rename anything with this: the permission checks are left to the |
| 3189 | * higher-level routines. |
Theodore Ts'o | 0e20270 | 2013-08-16 22:06:53 -0400 | [diff] [blame] | 3190 | * |
| 3191 | * n.b. old_{dentry,inode) refers to the source dentry/inode |
| 3192 | * while new_{dentry,inode) refers to the destination dentry/inode |
| 3193 | * This comes from rename(const char *oldpath, const char *newpath) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3194 | */ |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 3195 | static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 3196 | struct inode *new_dir, struct dentry *new_dentry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3197 | { |
Theodore Ts'o | 5b61de7 | 2013-08-16 22:06:14 -0400 | [diff] [blame] | 3198 | handle_t *handle = NULL; |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3199 | struct ext4_renament old = { |
| 3200 | .dir = old_dir, |
| 3201 | .dentry = old_dentry, |
| 3202 | .inode = old_dentry->d_inode, |
| 3203 | }; |
| 3204 | struct ext4_renament new = { |
| 3205 | .dir = new_dir, |
| 3206 | .dentry = new_dentry, |
| 3207 | .inode = new_dentry->d_inode, |
| 3208 | }; |
Darrick J. Wong | d80d448 | 2014-08-27 18:40:09 -0400 | [diff] [blame] | 3209 | int force_reread; |
Theodore Ts'o | 0e20270 | 2013-08-16 22:06:53 -0400 | [diff] [blame] | 3210 | int retval; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3211 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3212 | dquot_initialize(old.dir); |
| 3213 | dquot_initialize(new.dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3214 | |
| 3215 | /* Initialize quotas before so that eventual writes go |
| 3216 | * in separate transaction */ |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3217 | if (new.inode) |
| 3218 | dquot_initialize(new.inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3219 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3220 | 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] | 3221 | if (IS_ERR(old.bh)) |
| 3222 | return PTR_ERR(old.bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3223 | /* |
| 3224 | * Check for inode number is _not_ due to possible IO errors. |
| 3225 | * We might rmdir the source, keep it as pwd of some process |
| 3226 | * and merrily kill the link to whatever was created under the |
| 3227 | * same name. Goodbye sticky bit ;-< |
| 3228 | */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3229 | retval = -ENOENT; |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3230 | 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] | 3231 | goto end_rename; |
| 3232 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3233 | new.bh = ext4_find_entry(new.dir, &new.dentry->d_name, |
| 3234 | &new.de, &new.inlined); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 3235 | if (IS_ERR(new.bh)) { |
| 3236 | retval = PTR_ERR(new.bh); |
| 3237 | goto end_rename; |
| 3238 | } |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3239 | if (new.bh) { |
| 3240 | if (!new.inode) { |
| 3241 | brelse(new.bh); |
| 3242 | new.bh = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3243 | } |
| 3244 | } |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3245 | if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC)) |
| 3246 | ext4_alloc_da_blocks(old.inode); |
Theodore Ts'o | 5b61de7 | 2013-08-16 22:06:14 -0400 | [diff] [blame] | 3247 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3248 | handle = ext4_journal_start(old.dir, EXT4_HT_DIR, |
| 3249 | (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) + |
Theodore Ts'o | 5b61de7 | 2013-08-16 22:06:14 -0400 | [diff] [blame] | 3250 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2)); |
| 3251 | if (IS_ERR(handle)) |
| 3252 | return PTR_ERR(handle); |
| 3253 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3254 | if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir)) |
Theodore Ts'o | 5b61de7 | 2013-08-16 22:06:14 -0400 | [diff] [blame] | 3255 | ext4_handle_sync(handle); |
| 3256 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3257 | if (S_ISDIR(old.inode->i_mode)) { |
| 3258 | if (new.inode) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3259 | retval = -ENOTEMPTY; |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3260 | if (!empty_dir(new.inode)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3261 | goto end_rename; |
Miklos Szeredi | 0d7d5d6 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3262 | } else { |
| 3263 | retval = -EMLINK; |
| 3264 | if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir)) |
| 3265 | goto end_rename; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3266 | } |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3267 | retval = ext4_rename_dir_prepare(handle, &old); |
Amir Goldstein | ef60789 | 2011-03-20 21:18:44 -0400 | [diff] [blame] | 3268 | if (retval) |
| 3269 | goto end_rename; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3270 | } |
Darrick J. Wong | d80d448 | 2014-08-27 18:40:09 -0400 | [diff] [blame] | 3271 | /* |
| 3272 | * If we're renaming a file within an inline_data dir and adding or |
| 3273 | * setting the new dirent causes a conversion from inline_data to |
| 3274 | * extents/blockmap, we need to force the dirent delete code to |
| 3275 | * re-read the directory, or else we end up trying to delete a dirent |
| 3276 | * from what is now the extent tree root (or a block map). |
| 3277 | */ |
| 3278 | force_reread = (new.dir->i_ino == old.dir->i_ino && |
| 3279 | ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA)); |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3280 | if (!new.bh) { |
| 3281 | retval = ext4_add_entry(handle, new.dentry, old.inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3282 | if (retval) |
| 3283 | goto end_rename; |
| 3284 | } else { |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3285 | retval = ext4_setent(handle, &new, |
| 3286 | old.inode->i_ino, old.de->file_type); |
Amir Goldstein | ef60789 | 2011-03-20 21:18:44 -0400 | [diff] [blame] | 3287 | if (retval) |
| 3288 | goto end_rename; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3289 | } |
Darrick J. Wong | d80d448 | 2014-08-27 18:40:09 -0400 | [diff] [blame] | 3290 | if (force_reread) |
| 3291 | force_reread = !ext4_test_inode_flag(new.dir, |
| 3292 | EXT4_INODE_INLINE_DATA); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3293 | |
| 3294 | /* |
| 3295 | * Like most other Unix systems, set the ctime for inodes on a |
| 3296 | * rename. |
| 3297 | */ |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3298 | old.inode->i_ctime = ext4_current_time(old.inode); |
| 3299 | ext4_mark_inode_dirty(handle, old.inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3300 | |
| 3301 | /* |
| 3302 | * ok, that's it |
| 3303 | */ |
Darrick J. Wong | d80d448 | 2014-08-27 18:40:09 -0400 | [diff] [blame] | 3304 | ext4_rename_delete(handle, &old, force_reread); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3305 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3306 | if (new.inode) { |
| 3307 | ext4_dec_count(handle, new.inode); |
| 3308 | new.inode->i_ctime = ext4_current_time(new.inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3309 | } |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3310 | old.dir->i_ctime = old.dir->i_mtime = ext4_current_time(old.dir); |
| 3311 | ext4_update_dx_flag(old.dir); |
| 3312 | if (old.dir_bh) { |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3313 | retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino); |
| 3314 | if (retval) |
Theodore Ts'o | b409714 | 2011-01-10 12:46:59 -0500 | [diff] [blame] | 3315 | goto end_rename; |
Miklos Szeredi | bd1af14 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3316 | |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3317 | ext4_dec_count(handle, old.dir); |
| 3318 | if (new.inode) { |
Andreas Dilger | f8628a1 | 2007-07-18 08:38:01 -0400 | [diff] [blame] | 3319 | /* checked empty_dir above, can't have another parent, |
Theodore Ts'o | 825f148 | 2008-02-15 15:00:38 -0500 | [diff] [blame] | 3320 | * ext4_dec_count() won't work for many-linked dirs */ |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3321 | clear_nlink(new.inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3322 | } else { |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3323 | ext4_inc_count(handle, new.dir); |
| 3324 | ext4_update_dx_flag(new.dir); |
| 3325 | ext4_mark_inode_dirty(handle, new.dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3326 | } |
| 3327 | } |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3328 | ext4_mark_inode_dirty(handle, old.dir); |
| 3329 | if (new.inode) { |
| 3330 | ext4_mark_inode_dirty(handle, new.inode); |
| 3331 | if (!new.inode->i_nlink) |
| 3332 | ext4_orphan_add(handle, new.inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3333 | } |
| 3334 | retval = 0; |
| 3335 | |
| 3336 | end_rename: |
Miklos Szeredi | c0d268c | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3337 | brelse(old.dir_bh); |
| 3338 | brelse(old.bh); |
| 3339 | brelse(new.bh); |
Theodore Ts'o | 5b61de7 | 2013-08-16 22:06:14 -0400 | [diff] [blame] | 3340 | if (handle) |
| 3341 | ext4_journal_stop(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3342 | return retval; |
| 3343 | } |
| 3344 | |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3345 | static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 3346 | struct inode *new_dir, struct dentry *new_dentry) |
| 3347 | { |
| 3348 | handle_t *handle = NULL; |
| 3349 | struct ext4_renament old = { |
| 3350 | .dir = old_dir, |
| 3351 | .dentry = old_dentry, |
| 3352 | .inode = old_dentry->d_inode, |
| 3353 | }; |
| 3354 | struct ext4_renament new = { |
| 3355 | .dir = new_dir, |
| 3356 | .dentry = new_dentry, |
| 3357 | .inode = new_dentry->d_inode, |
| 3358 | }; |
| 3359 | u8 new_file_type; |
| 3360 | int retval; |
| 3361 | |
| 3362 | dquot_initialize(old.dir); |
| 3363 | dquot_initialize(new.dir); |
| 3364 | |
| 3365 | old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, |
| 3366 | &old.de, &old.inlined); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 3367 | if (IS_ERR(old.bh)) |
| 3368 | return PTR_ERR(old.bh); |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3369 | /* |
| 3370 | * Check for inode number is _not_ due to possible IO errors. |
| 3371 | * We might rmdir the source, keep it as pwd of some process |
| 3372 | * and merrily kill the link to whatever was created under the |
| 3373 | * same name. Goodbye sticky bit ;-< |
| 3374 | */ |
| 3375 | retval = -ENOENT; |
| 3376 | if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino) |
| 3377 | goto end_rename; |
| 3378 | |
| 3379 | new.bh = ext4_find_entry(new.dir, &new.dentry->d_name, |
| 3380 | &new.de, &new.inlined); |
Theodore Ts'o | 36de928 | 2014-08-23 17:47:19 -0400 | [diff] [blame] | 3381 | if (IS_ERR(new.bh)) { |
| 3382 | retval = PTR_ERR(new.bh); |
| 3383 | goto end_rename; |
| 3384 | } |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3385 | |
| 3386 | /* RENAME_EXCHANGE case: old *and* new must both exist */ |
| 3387 | if (!new.bh || le32_to_cpu(new.de->inode) != new.inode->i_ino) |
| 3388 | goto end_rename; |
| 3389 | |
| 3390 | handle = ext4_journal_start(old.dir, EXT4_HT_DIR, |
| 3391 | (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) + |
| 3392 | 2 * EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2)); |
| 3393 | if (IS_ERR(handle)) |
| 3394 | return PTR_ERR(handle); |
| 3395 | |
| 3396 | if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir)) |
| 3397 | ext4_handle_sync(handle); |
| 3398 | |
| 3399 | if (S_ISDIR(old.inode->i_mode)) { |
| 3400 | old.is_dir = true; |
| 3401 | retval = ext4_rename_dir_prepare(handle, &old); |
| 3402 | if (retval) |
| 3403 | goto end_rename; |
| 3404 | } |
| 3405 | if (S_ISDIR(new.inode->i_mode)) { |
| 3406 | new.is_dir = true; |
| 3407 | retval = ext4_rename_dir_prepare(handle, &new); |
| 3408 | if (retval) |
| 3409 | goto end_rename; |
| 3410 | } |
| 3411 | |
| 3412 | /* |
| 3413 | * Other than the special case of overwriting a directory, parents' |
| 3414 | * nlink only needs to be modified if this is a cross directory rename. |
| 3415 | */ |
| 3416 | if (old.dir != new.dir && old.is_dir != new.is_dir) { |
| 3417 | old.dir_nlink_delta = old.is_dir ? -1 : 1; |
| 3418 | new.dir_nlink_delta = -old.dir_nlink_delta; |
| 3419 | retval = -EMLINK; |
| 3420 | if ((old.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(old.dir)) || |
| 3421 | (new.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(new.dir))) |
| 3422 | goto end_rename; |
| 3423 | } |
| 3424 | |
| 3425 | new_file_type = new.de->file_type; |
| 3426 | retval = ext4_setent(handle, &new, old.inode->i_ino, old.de->file_type); |
| 3427 | if (retval) |
| 3428 | goto end_rename; |
| 3429 | |
| 3430 | retval = ext4_setent(handle, &old, new.inode->i_ino, new_file_type); |
| 3431 | if (retval) |
| 3432 | goto end_rename; |
| 3433 | |
| 3434 | /* |
| 3435 | * Like most other Unix systems, set the ctime for inodes on a |
| 3436 | * rename. |
| 3437 | */ |
| 3438 | old.inode->i_ctime = ext4_current_time(old.inode); |
| 3439 | new.inode->i_ctime = ext4_current_time(new.inode); |
| 3440 | ext4_mark_inode_dirty(handle, old.inode); |
| 3441 | ext4_mark_inode_dirty(handle, new.inode); |
| 3442 | |
| 3443 | if (old.dir_bh) { |
| 3444 | retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino); |
| 3445 | if (retval) |
| 3446 | goto end_rename; |
| 3447 | } |
| 3448 | if (new.dir_bh) { |
| 3449 | retval = ext4_rename_dir_finish(handle, &new, old.dir->i_ino); |
| 3450 | if (retval) |
| 3451 | goto end_rename; |
| 3452 | } |
| 3453 | ext4_update_dir_count(handle, &old); |
| 3454 | ext4_update_dir_count(handle, &new); |
| 3455 | retval = 0; |
| 3456 | |
| 3457 | end_rename: |
| 3458 | brelse(old.dir_bh); |
| 3459 | brelse(new.dir_bh); |
| 3460 | brelse(old.bh); |
| 3461 | brelse(new.bh); |
| 3462 | if (handle) |
| 3463 | ext4_journal_stop(handle); |
| 3464 | return retval; |
| 3465 | } |
| 3466 | |
Miklos Szeredi | 0a7c393 | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3467 | static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry, |
| 3468 | struct inode *new_dir, struct dentry *new_dentry, |
| 3469 | unsigned int flags) |
| 3470 | { |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3471 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE)) |
Miklos Szeredi | 0a7c393 | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3472 | return -EINVAL; |
| 3473 | |
Miklos Szeredi | bd42998 | 2014-04-01 17:08:44 +0200 | [diff] [blame] | 3474 | if (flags & RENAME_EXCHANGE) { |
| 3475 | return ext4_cross_rename(old_dir, old_dentry, |
| 3476 | new_dir, new_dentry); |
| 3477 | } |
| 3478 | /* |
| 3479 | * Existence checking was done by the VFS, otherwise "RENAME_NOREPLACE" |
| 3480 | * is equivalent to regular rename. |
| 3481 | */ |
Miklos Szeredi | 0a7c393 | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3482 | return ext4_rename(old_dir, old_dentry, new_dir, new_dentry); |
| 3483 | } |
| 3484 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3485 | /* |
| 3486 | * directories can handle most operations... |
| 3487 | */ |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 3488 | const struct inode_operations ext4_dir_inode_operations = { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3489 | .create = ext4_create, |
| 3490 | .lookup = ext4_lookup, |
| 3491 | .link = ext4_link, |
| 3492 | .unlink = ext4_unlink, |
| 3493 | .symlink = ext4_symlink, |
| 3494 | .mkdir = ext4_mkdir, |
| 3495 | .rmdir = ext4_rmdir, |
| 3496 | .mknod = ext4_mknod, |
Al Viro | af51a2a | 2013-06-29 13:23:08 +0400 | [diff] [blame] | 3497 | .tmpfile = ext4_tmpfile, |
Miklos Szeredi | 0a7c393 | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 3498 | .rename2 = ext4_rename2, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3499 | .setattr = ext4_setattr, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3500 | .setxattr = generic_setxattr, |
| 3501 | .getxattr = generic_getxattr, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3502 | .listxattr = ext4_listxattr, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3503 | .removexattr = generic_removexattr, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 3504 | .get_acl = ext4_get_acl, |
Christoph Hellwig | 64e178a | 2013-12-20 05:16:44 -0800 | [diff] [blame] | 3505 | .set_acl = ext4_set_acl, |
Aneesh Kumar K.V | abc8746 | 2009-05-02 22:54:32 -0400 | [diff] [blame] | 3506 | .fiemap = ext4_fiemap, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3507 | }; |
| 3508 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 3509 | const struct inode_operations ext4_special_inode_operations = { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3510 | .setattr = ext4_setattr, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3511 | .setxattr = generic_setxattr, |
| 3512 | .getxattr = generic_getxattr, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3513 | .listxattr = ext4_listxattr, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3514 | .removexattr = generic_removexattr, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 3515 | .get_acl = ext4_get_acl, |
Christoph Hellwig | 64e178a | 2013-12-20 05:16:44 -0800 | [diff] [blame] | 3516 | .set_acl = ext4_set_acl, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3517 | }; |