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> |
| 29 | #include <linux/jbd.h> |
| 30 | #include <linux/time.h> |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 31 | #include <linux/ext4_fs.h> |
| 32 | #include <linux/ext4_jbd.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 33 | #include <linux/fcntl.h> |
| 34 | #include <linux/stat.h> |
| 35 | #include <linux/string.h> |
| 36 | #include <linux/quotaops.h> |
| 37 | #include <linux/buffer_head.h> |
| 38 | #include <linux/bio.h> |
| 39 | #include <linux/smp_lock.h> |
| 40 | |
| 41 | #include "namei.h" |
| 42 | #include "xattr.h" |
| 43 | #include "acl.h" |
| 44 | |
| 45 | /* |
| 46 | * define how far ahead to read directories while searching them. |
| 47 | */ |
| 48 | #define NAMEI_RA_CHUNKS 2 |
| 49 | #define NAMEI_RA_BLOCKS 4 |
| 50 | #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) |
| 51 | #define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b)) |
| 52 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 53 | static struct buffer_head *ext4_append(handle_t *handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 54 | struct inode *inode, |
| 55 | u32 *block, int *err) |
| 56 | { |
| 57 | struct buffer_head *bh; |
| 58 | |
| 59 | *block = inode->i_size >> inode->i_sb->s_blocksize_bits; |
| 60 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 61 | if ((bh = ext4_bread(handle, inode, *block, 1, err))) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 62 | inode->i_size += inode->i_sb->s_blocksize; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 63 | EXT4_I(inode)->i_disksize = inode->i_size; |
| 64 | ext4_journal_get_write_access(handle,bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 65 | } |
| 66 | return bh; |
| 67 | } |
| 68 | |
| 69 | #ifndef assert |
| 70 | #define assert(test) J_ASSERT(test) |
| 71 | #endif |
| 72 | |
| 73 | #ifndef swap |
| 74 | #define swap(x, y) do { typeof(x) z = x; x = y; y = z; } while (0) |
| 75 | #endif |
| 76 | |
| 77 | #ifdef DX_DEBUG |
| 78 | #define dxtrace(command) command |
| 79 | #else |
| 80 | #define dxtrace(command) |
| 81 | #endif |
| 82 | |
| 83 | struct fake_dirent |
| 84 | { |
| 85 | __le32 inode; |
| 86 | __le16 rec_len; |
| 87 | u8 name_len; |
| 88 | u8 file_type; |
| 89 | }; |
| 90 | |
| 91 | struct dx_countlimit |
| 92 | { |
| 93 | __le16 limit; |
| 94 | __le16 count; |
| 95 | }; |
| 96 | |
| 97 | struct dx_entry |
| 98 | { |
| 99 | __le32 hash; |
| 100 | __le32 block; |
| 101 | }; |
| 102 | |
| 103 | /* |
| 104 | * dx_root_info is laid out so that if it should somehow get overlaid by a |
| 105 | * dirent the two low bits of the hash version will be zero. Therefore, the |
| 106 | * hash version mod 4 should never be 0. Sincerely, the paranoia department. |
| 107 | */ |
| 108 | |
| 109 | struct dx_root |
| 110 | { |
| 111 | struct fake_dirent dot; |
| 112 | char dot_name[4]; |
| 113 | struct fake_dirent dotdot; |
| 114 | char dotdot_name[4]; |
| 115 | struct dx_root_info |
| 116 | { |
| 117 | __le32 reserved_zero; |
| 118 | u8 hash_version; |
| 119 | u8 info_length; /* 8 */ |
| 120 | u8 indirect_levels; |
| 121 | u8 unused_flags; |
| 122 | } |
| 123 | info; |
| 124 | struct dx_entry entries[0]; |
| 125 | }; |
| 126 | |
| 127 | struct dx_node |
| 128 | { |
| 129 | struct fake_dirent fake; |
| 130 | struct dx_entry entries[0]; |
| 131 | }; |
| 132 | |
| 133 | |
| 134 | struct dx_frame |
| 135 | { |
| 136 | struct buffer_head *bh; |
| 137 | struct dx_entry *entries; |
| 138 | struct dx_entry *at; |
| 139 | }; |
| 140 | |
| 141 | struct dx_map_entry |
| 142 | { |
| 143 | u32 hash; |
| 144 | u32 offs; |
| 145 | }; |
| 146 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 147 | #ifdef CONFIG_EXT4_INDEX |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 148 | static inline unsigned dx_get_block (struct dx_entry *entry); |
| 149 | static void dx_set_block (struct dx_entry *entry, unsigned value); |
| 150 | static inline unsigned dx_get_hash (struct dx_entry *entry); |
| 151 | static void dx_set_hash (struct dx_entry *entry, unsigned value); |
| 152 | static unsigned dx_get_count (struct dx_entry *entries); |
| 153 | static unsigned dx_get_limit (struct dx_entry *entries); |
| 154 | static void dx_set_count (struct dx_entry *entries, unsigned value); |
| 155 | static void dx_set_limit (struct dx_entry *entries, unsigned value); |
| 156 | static unsigned dx_root_limit (struct inode *dir, unsigned infosize); |
| 157 | static unsigned dx_node_limit (struct inode *dir); |
| 158 | static struct dx_frame *dx_probe(struct dentry *dentry, |
| 159 | struct inode *dir, |
| 160 | struct dx_hash_info *hinfo, |
| 161 | struct dx_frame *frame, |
| 162 | int *err); |
| 163 | static void dx_release (struct dx_frame *frames); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 164 | static int dx_make_map (struct ext4_dir_entry_2 *de, int size, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 165 | struct dx_hash_info *hinfo, struct dx_map_entry map[]); |
| 166 | static void dx_sort_map(struct dx_map_entry *map, unsigned count); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 167 | static struct ext4_dir_entry_2 *dx_move_dirents (char *from, char *to, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 168 | struct dx_map_entry *offsets, int count); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 169 | static struct ext4_dir_entry_2* dx_pack_dirents (char *base, int size); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 170 | static void dx_insert_block (struct dx_frame *frame, u32 hash, u32 block); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 171 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 172 | struct dx_frame *frame, |
| 173 | struct dx_frame *frames, |
| 174 | __u32 *start_hash); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 175 | static struct buffer_head * ext4_dx_find_entry(struct dentry *dentry, |
| 176 | struct ext4_dir_entry_2 **res_dir, int *err); |
| 177 | static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 178 | struct inode *inode); |
| 179 | |
| 180 | /* |
| 181 | * Future: use high four bits of block for coalesce-on-delete flags |
| 182 | * Mask them off for now. |
| 183 | */ |
| 184 | |
| 185 | static inline unsigned dx_get_block (struct dx_entry *entry) |
| 186 | { |
| 187 | return le32_to_cpu(entry->block) & 0x00ffffff; |
| 188 | } |
| 189 | |
| 190 | static inline void dx_set_block (struct dx_entry *entry, unsigned value) |
| 191 | { |
| 192 | entry->block = cpu_to_le32(value); |
| 193 | } |
| 194 | |
| 195 | static inline unsigned dx_get_hash (struct dx_entry *entry) |
| 196 | { |
| 197 | return le32_to_cpu(entry->hash); |
| 198 | } |
| 199 | |
| 200 | static inline void dx_set_hash (struct dx_entry *entry, unsigned value) |
| 201 | { |
| 202 | entry->hash = cpu_to_le32(value); |
| 203 | } |
| 204 | |
| 205 | static inline unsigned dx_get_count (struct dx_entry *entries) |
| 206 | { |
| 207 | return le16_to_cpu(((struct dx_countlimit *) entries)->count); |
| 208 | } |
| 209 | |
| 210 | static inline unsigned dx_get_limit (struct dx_entry *entries) |
| 211 | { |
| 212 | return le16_to_cpu(((struct dx_countlimit *) entries)->limit); |
| 213 | } |
| 214 | |
| 215 | static inline void dx_set_count (struct dx_entry *entries, unsigned value) |
| 216 | { |
| 217 | ((struct dx_countlimit *) entries)->count = cpu_to_le16(value); |
| 218 | } |
| 219 | |
| 220 | static inline void dx_set_limit (struct dx_entry *entries, unsigned value) |
| 221 | { |
| 222 | ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value); |
| 223 | } |
| 224 | |
| 225 | static inline unsigned dx_root_limit (struct inode *dir, unsigned infosize) |
| 226 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 227 | unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) - |
| 228 | EXT4_DIR_REC_LEN(2) - infosize; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 229 | return 0? 20: entry_space / sizeof(struct dx_entry); |
| 230 | } |
| 231 | |
| 232 | static inline unsigned dx_node_limit (struct inode *dir) |
| 233 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 234 | unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 235 | return 0? 22: entry_space / sizeof(struct dx_entry); |
| 236 | } |
| 237 | |
| 238 | /* |
| 239 | * Debug |
| 240 | */ |
| 241 | #ifdef DX_DEBUG |
| 242 | static void dx_show_index (char * label, struct dx_entry *entries) |
| 243 | { |
| 244 | int i, n = dx_get_count (entries); |
| 245 | printk("%s index ", label); |
| 246 | for (i = 0; i < n; i++) |
| 247 | { |
| 248 | printk("%x->%u ", i? dx_get_hash(entries + i): 0, dx_get_block(entries + i)); |
| 249 | } |
| 250 | printk("\n"); |
| 251 | } |
| 252 | |
| 253 | struct stats |
| 254 | { |
| 255 | unsigned names; |
| 256 | unsigned space; |
| 257 | unsigned bcount; |
| 258 | }; |
| 259 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 260 | 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] | 261 | int size, int show_names) |
| 262 | { |
| 263 | unsigned names = 0, space = 0; |
| 264 | char *base = (char *) de; |
| 265 | struct dx_hash_info h = *hinfo; |
| 266 | |
| 267 | printk("names: "); |
| 268 | while ((char *) de < base + size) |
| 269 | { |
| 270 | if (de->inode) |
| 271 | { |
| 272 | if (show_names) |
| 273 | { |
| 274 | int len = de->name_len; |
| 275 | char *name = de->name; |
| 276 | while (len--) printk("%c", *name++); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 277 | ext4fs_dirhash(de->name, de->name_len, &h); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 278 | printk(":%x.%u ", h.hash, |
| 279 | ((char *) de - base)); |
| 280 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 281 | space += EXT4_DIR_REC_LEN(de->name_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 282 | names++; |
| 283 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 284 | de = (struct ext4_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 285 | } |
| 286 | printk("(%i)\n", names); |
| 287 | return (struct stats) { names, space, 1 }; |
| 288 | } |
| 289 | |
| 290 | struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir, |
| 291 | struct dx_entry *entries, int levels) |
| 292 | { |
| 293 | unsigned blocksize = dir->i_sb->s_blocksize; |
| 294 | unsigned count = dx_get_count (entries), names = 0, space = 0, i; |
| 295 | unsigned bcount = 0; |
| 296 | struct buffer_head *bh; |
| 297 | int err; |
| 298 | printk("%i indexed blocks...\n", count); |
| 299 | for (i = 0; i < count; i++, entries++) |
| 300 | { |
| 301 | u32 block = dx_get_block(entries), hash = i? dx_get_hash(entries): 0; |
| 302 | u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash; |
| 303 | struct stats stats; |
| 304 | printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 305 | if (!(bh = ext4_bread (NULL,dir, block, 0,&err))) continue; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 306 | stats = levels? |
| 307 | 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] | 308 | 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] | 309 | names += stats.names; |
| 310 | space += stats.space; |
| 311 | bcount += stats.bcount; |
| 312 | brelse (bh); |
| 313 | } |
| 314 | if (bcount) |
| 315 | printk("%snames %u, fullness %u (%u%%)\n", levels?"":" ", |
| 316 | names, space/bcount,(space/bcount)*100/blocksize); |
| 317 | return (struct stats) { names, space, bcount}; |
| 318 | } |
| 319 | #endif /* DX_DEBUG */ |
| 320 | |
| 321 | /* |
| 322 | * Probe for a directory leaf block to search. |
| 323 | * |
| 324 | * dx_probe can return ERR_BAD_DX_DIR, which means there was a format |
| 325 | * error in the directory index, and the caller should fall back to |
| 326 | * searching the directory normally. The callers of dx_probe **MUST** |
| 327 | * check for this error code, and make sure it never gets reflected |
| 328 | * back to userspace. |
| 329 | */ |
| 330 | static struct dx_frame * |
| 331 | dx_probe(struct dentry *dentry, struct inode *dir, |
| 332 | struct dx_hash_info *hinfo, struct dx_frame *frame_in, int *err) |
| 333 | { |
| 334 | unsigned count, indirect; |
| 335 | struct dx_entry *at, *entries, *p, *q, *m; |
| 336 | struct dx_root *root; |
| 337 | struct buffer_head *bh; |
| 338 | struct dx_frame *frame = frame_in; |
| 339 | u32 hash; |
| 340 | |
| 341 | frame->bh = NULL; |
| 342 | if (dentry) |
| 343 | dir = dentry->d_parent->d_inode; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 344 | if (!(bh = ext4_bread (NULL,dir, 0, 0, err))) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 345 | goto fail; |
| 346 | root = (struct dx_root *) bh->b_data; |
| 347 | if (root->info.hash_version != DX_HASH_TEA && |
| 348 | root->info.hash_version != DX_HASH_HALF_MD4 && |
| 349 | root->info.hash_version != DX_HASH_LEGACY) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 350 | ext4_warning(dir->i_sb, __FUNCTION__, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 351 | "Unrecognised inode hash code %d", |
| 352 | root->info.hash_version); |
| 353 | brelse(bh); |
| 354 | *err = ERR_BAD_DX_DIR; |
| 355 | goto fail; |
| 356 | } |
| 357 | hinfo->hash_version = root->info.hash_version; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 358 | hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 359 | if (dentry) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 360 | ext4fs_dirhash(dentry->d_name.name, dentry->d_name.len, hinfo); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 361 | hash = hinfo->hash; |
| 362 | |
| 363 | if (root->info.unused_flags & 1) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 364 | ext4_warning(dir->i_sb, __FUNCTION__, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 365 | "Unimplemented inode hash flags: %#06x", |
| 366 | root->info.unused_flags); |
| 367 | brelse(bh); |
| 368 | *err = ERR_BAD_DX_DIR; |
| 369 | goto fail; |
| 370 | } |
| 371 | |
| 372 | if ((indirect = root->info.indirect_levels) > 1) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 373 | ext4_warning(dir->i_sb, __FUNCTION__, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 374 | "Unimplemented inode hash depth: %#06x", |
| 375 | root->info.indirect_levels); |
| 376 | brelse(bh); |
| 377 | *err = ERR_BAD_DX_DIR; |
| 378 | goto fail; |
| 379 | } |
| 380 | |
| 381 | entries = (struct dx_entry *) (((char *)&root->info) + |
| 382 | root->info.info_length); |
| 383 | assert(dx_get_limit(entries) == dx_root_limit(dir, |
| 384 | root->info.info_length)); |
| 385 | dxtrace (printk("Look up %x", hash)); |
| 386 | while (1) |
| 387 | { |
| 388 | count = dx_get_count(entries); |
| 389 | assert (count && count <= dx_get_limit(entries)); |
| 390 | p = entries + 1; |
| 391 | q = entries + count - 1; |
| 392 | while (p <= q) |
| 393 | { |
| 394 | m = p + (q - p)/2; |
| 395 | dxtrace(printk(".")); |
| 396 | if (dx_get_hash(m) > hash) |
| 397 | q = m - 1; |
| 398 | else |
| 399 | p = m + 1; |
| 400 | } |
| 401 | |
| 402 | if (0) // linear search cross check |
| 403 | { |
| 404 | unsigned n = count - 1; |
| 405 | at = entries; |
| 406 | while (n--) |
| 407 | { |
| 408 | dxtrace(printk(",")); |
| 409 | if (dx_get_hash(++at) > hash) |
| 410 | { |
| 411 | at--; |
| 412 | break; |
| 413 | } |
| 414 | } |
| 415 | assert (at == p - 1); |
| 416 | } |
| 417 | |
| 418 | at = p - 1; |
| 419 | dxtrace(printk(" %x->%u\n", at == entries? 0: dx_get_hash(at), dx_get_block(at))); |
| 420 | frame->bh = bh; |
| 421 | frame->entries = entries; |
| 422 | frame->at = at; |
| 423 | if (!indirect--) return frame; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 424 | if (!(bh = ext4_bread (NULL,dir, dx_get_block(at), 0, err))) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 425 | goto fail2; |
| 426 | at = entries = ((struct dx_node *) bh->b_data)->entries; |
| 427 | assert (dx_get_limit(entries) == dx_node_limit (dir)); |
| 428 | frame++; |
| 429 | } |
| 430 | fail2: |
| 431 | while (frame >= frame_in) { |
| 432 | brelse(frame->bh); |
| 433 | frame--; |
| 434 | } |
| 435 | fail: |
| 436 | return NULL; |
| 437 | } |
| 438 | |
| 439 | static void dx_release (struct dx_frame *frames) |
| 440 | { |
| 441 | if (frames[0].bh == NULL) |
| 442 | return; |
| 443 | |
| 444 | if (((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels) |
| 445 | brelse(frames[1].bh); |
| 446 | brelse(frames[0].bh); |
| 447 | } |
| 448 | |
| 449 | /* |
| 450 | * This function increments the frame pointer to search the next leaf |
| 451 | * block, and reads in the necessary intervening nodes if the search |
| 452 | * should be necessary. Whether or not the search is necessary is |
| 453 | * controlled by the hash parameter. If the hash value is even, then |
| 454 | * the search is only continued if the next block starts with that |
| 455 | * hash value. This is used if we are searching for a specific file. |
| 456 | * |
| 457 | * If the hash value is HASH_NB_ALWAYS, then always go to the next block. |
| 458 | * |
| 459 | * This function returns 1 if the caller should continue to search, |
| 460 | * or 0 if it should not. If there is an error reading one of the |
| 461 | * index blocks, it will a negative error code. |
| 462 | * |
| 463 | * If start_hash is non-null, it will be filled in with the starting |
| 464 | * hash of the next page. |
| 465 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 466 | static int ext4_htree_next_block(struct inode *dir, __u32 hash, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 467 | struct dx_frame *frame, |
| 468 | struct dx_frame *frames, |
| 469 | __u32 *start_hash) |
| 470 | { |
| 471 | struct dx_frame *p; |
| 472 | struct buffer_head *bh; |
| 473 | int err, num_frames = 0; |
| 474 | __u32 bhash; |
| 475 | |
| 476 | p = frame; |
| 477 | /* |
| 478 | * Find the next leaf page by incrementing the frame pointer. |
| 479 | * If we run out of entries in the interior node, loop around and |
| 480 | * increment pointer in the parent node. When we break out of |
| 481 | * this loop, num_frames indicates the number of interior |
| 482 | * nodes need to be read. |
| 483 | */ |
| 484 | while (1) { |
| 485 | if (++(p->at) < p->entries + dx_get_count(p->entries)) |
| 486 | break; |
| 487 | if (p == frames) |
| 488 | return 0; |
| 489 | num_frames++; |
| 490 | p--; |
| 491 | } |
| 492 | |
| 493 | /* |
| 494 | * If the hash is 1, then continue only if the next page has a |
| 495 | * continuation hash of any value. This is used for readdir |
| 496 | * handling. Otherwise, check to see if the hash matches the |
| 497 | * desired contiuation hash. If it doesn't, return since |
| 498 | * there's no point to read in the successive index pages. |
| 499 | */ |
| 500 | bhash = dx_get_hash(p->at); |
| 501 | if (start_hash) |
| 502 | *start_hash = bhash; |
| 503 | if ((hash & 1) == 0) { |
| 504 | if ((bhash & ~1) != hash) |
| 505 | return 0; |
| 506 | } |
| 507 | /* |
| 508 | * If the hash is HASH_NB_ALWAYS, we always go to the next |
| 509 | * block so no check is necessary |
| 510 | */ |
| 511 | while (num_frames--) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 512 | if (!(bh = ext4_bread(NULL, dir, dx_get_block(p->at), |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 513 | 0, &err))) |
| 514 | return err; /* Failure */ |
| 515 | p++; |
| 516 | brelse (p->bh); |
| 517 | p->bh = bh; |
| 518 | p->at = p->entries = ((struct dx_node *) bh->b_data)->entries; |
| 519 | } |
| 520 | return 1; |
| 521 | } |
| 522 | |
| 523 | |
| 524 | /* |
| 525 | * p is at least 6 bytes before the end of page |
| 526 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 527 | static inline struct ext4_dir_entry_2 *ext4_next_entry(struct ext4_dir_entry_2 *p) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 528 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 529 | return (struct ext4_dir_entry_2 *)((char*)p + le16_to_cpu(p->rec_len)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 530 | } |
| 531 | |
| 532 | /* |
| 533 | * This function fills a red-black tree with information from a |
| 534 | * directory block. It returns the number directory entries loaded |
| 535 | * into the tree. If there is an error it is returned in err. |
| 536 | */ |
| 537 | static int htree_dirblock_to_tree(struct file *dir_file, |
| 538 | struct inode *dir, int block, |
| 539 | struct dx_hash_info *hinfo, |
| 540 | __u32 start_hash, __u32 start_minor_hash) |
| 541 | { |
| 542 | struct buffer_head *bh; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 543 | struct ext4_dir_entry_2 *de, *top; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 544 | int err, count = 0; |
| 545 | |
| 546 | dxtrace(printk("In htree dirblock_to_tree: block %d\n", block)); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 547 | if (!(bh = ext4_bread (NULL, dir, block, 0, &err))) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 548 | return err; |
| 549 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 550 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
| 551 | top = (struct ext4_dir_entry_2 *) ((char *) de + |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 552 | dir->i_sb->s_blocksize - |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 553 | EXT4_DIR_REC_LEN(0)); |
| 554 | for (; de < top; de = ext4_next_entry(de)) { |
| 555 | ext4fs_dirhash(de->name, de->name_len, hinfo); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 556 | if ((hinfo->hash < start_hash) || |
| 557 | ((hinfo->hash == start_hash) && |
| 558 | (hinfo->minor_hash < start_minor_hash))) |
| 559 | continue; |
| 560 | if (de->inode == 0) |
| 561 | continue; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 562 | if ((err = ext4_htree_store_dirent(dir_file, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 563 | hinfo->hash, hinfo->minor_hash, de)) != 0) { |
| 564 | brelse(bh); |
| 565 | return err; |
| 566 | } |
| 567 | count++; |
| 568 | } |
| 569 | brelse(bh); |
| 570 | return count; |
| 571 | } |
| 572 | |
| 573 | |
| 574 | /* |
| 575 | * This function fills a red-black tree with information from a |
| 576 | * directory. We start scanning the directory in hash order, starting |
| 577 | * at start_hash and start_minor_hash. |
| 578 | * |
| 579 | * This function returns the number of entries inserted into the tree, |
| 580 | * or a negative error code. |
| 581 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 582 | int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 583 | __u32 start_minor_hash, __u32 *next_hash) |
| 584 | { |
| 585 | struct dx_hash_info hinfo; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 586 | struct ext4_dir_entry_2 *de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 587 | struct dx_frame frames[2], *frame; |
| 588 | struct inode *dir; |
| 589 | int block, err; |
| 590 | int count = 0; |
| 591 | int ret; |
| 592 | __u32 hashval; |
| 593 | |
| 594 | dxtrace(printk("In htree_fill_tree, start hash: %x:%x\n", start_hash, |
| 595 | start_minor_hash)); |
| 596 | dir = dir_file->f_dentry->d_inode; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 597 | if (!(EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) { |
| 598 | hinfo.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version; |
| 599 | hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 600 | count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo, |
| 601 | start_hash, start_minor_hash); |
| 602 | *next_hash = ~0; |
| 603 | return count; |
| 604 | } |
| 605 | hinfo.hash = start_hash; |
| 606 | hinfo.minor_hash = 0; |
| 607 | frame = dx_probe(NULL, dir_file->f_dentry->d_inode, &hinfo, frames, &err); |
| 608 | if (!frame) |
| 609 | return err; |
| 610 | |
| 611 | /* Add '.' and '..' from the htree header */ |
| 612 | if (!start_hash && !start_minor_hash) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 613 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
| 614 | if ((err = ext4_htree_store_dirent(dir_file, 0, 0, de)) != 0) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 615 | goto errout; |
| 616 | count++; |
| 617 | } |
| 618 | if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 619 | de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data; |
| 620 | de = ext4_next_entry(de); |
| 621 | if ((err = ext4_htree_store_dirent(dir_file, 2, 0, de)) != 0) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 622 | goto errout; |
| 623 | count++; |
| 624 | } |
| 625 | |
| 626 | while (1) { |
| 627 | block = dx_get_block(frame->at); |
| 628 | ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo, |
| 629 | start_hash, start_minor_hash); |
| 630 | if (ret < 0) { |
| 631 | err = ret; |
| 632 | goto errout; |
| 633 | } |
| 634 | count += ret; |
| 635 | hashval = ~0; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 636 | ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 637 | frame, frames, &hashval); |
| 638 | *next_hash = hashval; |
| 639 | if (ret < 0) { |
| 640 | err = ret; |
| 641 | goto errout; |
| 642 | } |
| 643 | /* |
| 644 | * Stop if: (a) there are no more entries, or |
| 645 | * (b) we have inserted at least one entry and the |
| 646 | * next hash value is not a continuation |
| 647 | */ |
| 648 | if ((ret == 0) || |
| 649 | (count && ((hashval & 1) == 0))) |
| 650 | break; |
| 651 | } |
| 652 | dx_release(frames); |
| 653 | dxtrace(printk("Fill tree: returned %d entries, next hash: %x\n", |
| 654 | count, *next_hash)); |
| 655 | return count; |
| 656 | errout: |
| 657 | dx_release(frames); |
| 658 | return (err); |
| 659 | } |
| 660 | |
| 661 | |
| 662 | /* |
| 663 | * Directory block splitting, compacting |
| 664 | */ |
| 665 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 666 | static int dx_make_map (struct ext4_dir_entry_2 *de, int size, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 667 | struct dx_hash_info *hinfo, struct dx_map_entry *map_tail) |
| 668 | { |
| 669 | int count = 0; |
| 670 | char *base = (char *) de; |
| 671 | struct dx_hash_info h = *hinfo; |
| 672 | |
| 673 | while ((char *) de < base + size) |
| 674 | { |
| 675 | if (de->name_len && de->inode) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 676 | ext4fs_dirhash(de->name, de->name_len, &h); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 677 | map_tail--; |
| 678 | map_tail->hash = h.hash; |
| 679 | map_tail->offs = (u32) ((char *) de - base); |
| 680 | count++; |
| 681 | cond_resched(); |
| 682 | } |
| 683 | /* XXX: do we need to check rec_len == 0 case? -Chris */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 684 | de = (struct ext4_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 685 | } |
| 686 | return count; |
| 687 | } |
| 688 | |
| 689 | static void dx_sort_map (struct dx_map_entry *map, unsigned count) |
| 690 | { |
| 691 | struct dx_map_entry *p, *q, *top = map + count - 1; |
| 692 | int more; |
| 693 | /* Combsort until bubble sort doesn't suck */ |
| 694 | while (count > 2) |
| 695 | { |
| 696 | count = count*10/13; |
| 697 | if (count - 9 < 2) /* 9, 10 -> 11 */ |
| 698 | count = 11; |
| 699 | for (p = top, q = p - count; q >= map; p--, q--) |
| 700 | if (p->hash < q->hash) |
| 701 | swap(*p, *q); |
| 702 | } |
| 703 | /* Garden variety bubble sort */ |
| 704 | do { |
| 705 | more = 0; |
| 706 | q = top; |
| 707 | while (q-- > map) |
| 708 | { |
| 709 | if (q[1].hash >= q[0].hash) |
| 710 | continue; |
| 711 | swap(*(q+1), *q); |
| 712 | more = 1; |
| 713 | } |
| 714 | } while(more); |
| 715 | } |
| 716 | |
| 717 | static void dx_insert_block(struct dx_frame *frame, u32 hash, u32 block) |
| 718 | { |
| 719 | struct dx_entry *entries = frame->entries; |
| 720 | struct dx_entry *old = frame->at, *new = old + 1; |
| 721 | int count = dx_get_count(entries); |
| 722 | |
| 723 | assert(count < dx_get_limit(entries)); |
| 724 | assert(old < entries + count); |
| 725 | memmove(new + 1, new, (char *)(entries + count) - (char *)(new)); |
| 726 | dx_set_hash(new, hash); |
| 727 | dx_set_block(new, block); |
| 728 | dx_set_count(entries, count + 1); |
| 729 | } |
| 730 | #endif |
| 731 | |
| 732 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 733 | static void ext4_update_dx_flag(struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 734 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 735 | if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, |
| 736 | EXT4_FEATURE_COMPAT_DIR_INDEX)) |
| 737 | EXT4_I(inode)->i_flags &= ~EXT4_INDEX_FL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 738 | } |
| 739 | |
| 740 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 741 | * NOTE! unlike strncmp, ext4_match returns 1 for success, 0 for failure. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 742 | * |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 743 | * `len <= EXT4_NAME_LEN' is guaranteed by caller. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 744 | * `de != NULL' is guaranteed by caller. |
| 745 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 746 | static inline int ext4_match (int len, const char * const name, |
| 747 | struct ext4_dir_entry_2 * de) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 748 | { |
| 749 | if (len != de->name_len) |
| 750 | return 0; |
| 751 | if (!de->inode) |
| 752 | return 0; |
| 753 | return !memcmp(name, de->name, len); |
| 754 | } |
| 755 | |
| 756 | /* |
| 757 | * Returns 0 if not found, -1 on failure, and 1 on success |
| 758 | */ |
| 759 | static inline int search_dirblock(struct buffer_head * bh, |
| 760 | struct inode *dir, |
| 761 | struct dentry *dentry, |
| 762 | unsigned long offset, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 763 | struct ext4_dir_entry_2 ** res_dir) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 764 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 765 | struct ext4_dir_entry_2 * de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 766 | char * dlimit; |
| 767 | int de_len; |
| 768 | const char *name = dentry->d_name.name; |
| 769 | int namelen = dentry->d_name.len; |
| 770 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 771 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 772 | dlimit = bh->b_data + dir->i_sb->s_blocksize; |
| 773 | while ((char *) de < dlimit) { |
| 774 | /* this code is executed quadratically often */ |
| 775 | /* do minimal checking `by hand' */ |
| 776 | |
| 777 | if ((char *) de + namelen <= dlimit && |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 778 | ext4_match (namelen, name, de)) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 779 | /* found a match - just to be sure, do a full check */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 780 | if (!ext4_check_dir_entry("ext4_find_entry", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 781 | dir, de, bh, offset)) |
| 782 | return -1; |
| 783 | *res_dir = de; |
| 784 | return 1; |
| 785 | } |
| 786 | /* prevent looping on a bad block */ |
| 787 | de_len = le16_to_cpu(de->rec_len); |
| 788 | if (de_len <= 0) |
| 789 | return -1; |
| 790 | offset += de_len; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 791 | de = (struct ext4_dir_entry_2 *) ((char *) de + de_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 792 | } |
| 793 | return 0; |
| 794 | } |
| 795 | |
| 796 | |
| 797 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 798 | * ext4_find_entry() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 799 | * |
| 800 | * finds an entry in the specified directory with the wanted name. It |
| 801 | * returns the cache buffer in which the entry was found, and the entry |
| 802 | * itself (as a parameter - res_dir). It does NOT read the inode of the |
| 803 | * entry - you'll have to do that yourself if you want to. |
| 804 | * |
| 805 | * The returned buffer_head has ->b_count elevated. The caller is expected |
| 806 | * to brelse() it when appropriate. |
| 807 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 808 | static struct buffer_head * ext4_find_entry (struct dentry *dentry, |
| 809 | struct ext4_dir_entry_2 ** res_dir) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 810 | { |
| 811 | struct super_block * sb; |
| 812 | struct buffer_head * bh_use[NAMEI_RA_SIZE]; |
| 813 | struct buffer_head * bh, *ret = NULL; |
| 814 | unsigned long start, block, b; |
| 815 | int ra_max = 0; /* Number of bh's in the readahead |
| 816 | buffer, bh_use[] */ |
| 817 | int ra_ptr = 0; /* Current index into readahead |
| 818 | buffer */ |
| 819 | int num = 0; |
| 820 | int nblocks, i, err; |
| 821 | struct inode *dir = dentry->d_parent->d_inode; |
| 822 | int namelen; |
| 823 | const u8 *name; |
| 824 | unsigned blocksize; |
| 825 | |
| 826 | *res_dir = NULL; |
| 827 | sb = dir->i_sb; |
| 828 | blocksize = sb->s_blocksize; |
| 829 | namelen = dentry->d_name.len; |
| 830 | name = dentry->d_name.name; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 831 | if (namelen > EXT4_NAME_LEN) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 832 | return NULL; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 833 | #ifdef CONFIG_EXT4_INDEX |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 834 | if (is_dx(dir)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 835 | bh = ext4_dx_find_entry(dentry, res_dir, &err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 836 | /* |
| 837 | * On success, or if the error was file not found, |
| 838 | * return. Otherwise, fall back to doing a search the |
| 839 | * old fashioned way. |
| 840 | */ |
| 841 | if (bh || (err != ERR_BAD_DX_DIR)) |
| 842 | return bh; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 843 | dxtrace(printk("ext4_find_entry: dx failed, falling back\n")); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 844 | } |
| 845 | #endif |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 846 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
| 847 | start = EXT4_I(dir)->i_dir_start_lookup; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 848 | if (start >= nblocks) |
| 849 | start = 0; |
| 850 | block = start; |
| 851 | restart: |
| 852 | do { |
| 853 | /* |
| 854 | * We deal with the read-ahead logic here. |
| 855 | */ |
| 856 | if (ra_ptr >= ra_max) { |
| 857 | /* Refill the readahead buffer */ |
| 858 | ra_ptr = 0; |
| 859 | b = block; |
| 860 | for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) { |
| 861 | /* |
| 862 | * Terminate if we reach the end of the |
| 863 | * directory and must wrap, or if our |
| 864 | * search has finished at this block. |
| 865 | */ |
| 866 | if (b >= nblocks || (num && block == start)) { |
| 867 | bh_use[ra_max] = NULL; |
| 868 | break; |
| 869 | } |
| 870 | num++; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 871 | bh = ext4_getblk(NULL, dir, b++, 0, &err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 872 | bh_use[ra_max] = bh; |
| 873 | if (bh) |
| 874 | ll_rw_block(READ_META, 1, &bh); |
| 875 | } |
| 876 | } |
| 877 | if ((bh = bh_use[ra_ptr++]) == NULL) |
| 878 | goto next; |
| 879 | wait_on_buffer(bh); |
| 880 | if (!buffer_uptodate(bh)) { |
| 881 | /* read error, skip block & hope for the best */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 882 | ext4_error(sb, __FUNCTION__, "reading directory #%lu " |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 883 | "offset %lu", dir->i_ino, block); |
| 884 | brelse(bh); |
| 885 | goto next; |
| 886 | } |
| 887 | i = search_dirblock(bh, dir, dentry, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 888 | block << EXT4_BLOCK_SIZE_BITS(sb), res_dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 889 | if (i == 1) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 890 | EXT4_I(dir)->i_dir_start_lookup = block; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 891 | ret = bh; |
| 892 | goto cleanup_and_exit; |
| 893 | } else { |
| 894 | brelse(bh); |
| 895 | if (i < 0) |
| 896 | goto cleanup_and_exit; |
| 897 | } |
| 898 | next: |
| 899 | if (++block >= nblocks) |
| 900 | block = 0; |
| 901 | } while (block != start); |
| 902 | |
| 903 | /* |
| 904 | * If the directory has grown while we were searching, then |
| 905 | * search the last part of the directory before giving up. |
| 906 | */ |
| 907 | block = nblocks; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 908 | nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 909 | if (block < nblocks) { |
| 910 | start = 0; |
| 911 | goto restart; |
| 912 | } |
| 913 | |
| 914 | cleanup_and_exit: |
| 915 | /* Clean up the read-ahead blocks */ |
| 916 | for (; ra_ptr < ra_max; ra_ptr++) |
| 917 | brelse (bh_use[ra_ptr]); |
| 918 | return ret; |
| 919 | } |
| 920 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 921 | #ifdef CONFIG_EXT4_INDEX |
| 922 | static struct buffer_head * ext4_dx_find_entry(struct dentry *dentry, |
| 923 | struct ext4_dir_entry_2 **res_dir, int *err) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 924 | { |
| 925 | struct super_block * sb; |
| 926 | struct dx_hash_info hinfo; |
| 927 | u32 hash; |
| 928 | struct dx_frame frames[2], *frame; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 929 | struct ext4_dir_entry_2 *de, *top; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 930 | struct buffer_head *bh; |
| 931 | unsigned long block; |
| 932 | int retval; |
| 933 | int namelen = dentry->d_name.len; |
| 934 | const u8 *name = dentry->d_name.name; |
| 935 | struct inode *dir = dentry->d_parent->d_inode; |
| 936 | |
| 937 | sb = dir->i_sb; |
| 938 | /* NFS may look up ".." - look at dx_root directory block */ |
| 939 | if (namelen > 2 || name[0] != '.'||(name[1] != '.' && name[1] != '\0')){ |
| 940 | if (!(frame = dx_probe(dentry, NULL, &hinfo, frames, err))) |
| 941 | return NULL; |
| 942 | } else { |
| 943 | frame = frames; |
| 944 | frame->bh = NULL; /* for dx_release() */ |
| 945 | frame->at = (struct dx_entry *)frames; /* hack for zero entry*/ |
| 946 | dx_set_block(frame->at, 0); /* dx_root block is 0 */ |
| 947 | } |
| 948 | hash = hinfo.hash; |
| 949 | do { |
| 950 | block = dx_get_block(frame->at); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 951 | if (!(bh = ext4_bread (NULL,dir, block, 0, err))) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 952 | goto errout; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 953 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
| 954 | top = (struct ext4_dir_entry_2 *) ((char *) de + sb->s_blocksize - |
| 955 | EXT4_DIR_REC_LEN(0)); |
| 956 | for (; de < top; de = ext4_next_entry(de)) |
| 957 | if (ext4_match (namelen, name, de)) { |
| 958 | if (!ext4_check_dir_entry("ext4_find_entry", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 959 | dir, de, bh, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 960 | (block<<EXT4_BLOCK_SIZE_BITS(sb)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 961 | +((char *)de - bh->b_data))) { |
| 962 | brelse (bh); |
| 963 | goto errout; |
| 964 | } |
| 965 | *res_dir = de; |
| 966 | dx_release (frames); |
| 967 | return bh; |
| 968 | } |
| 969 | brelse (bh); |
| 970 | /* Check to see if we should continue to search */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 971 | retval = ext4_htree_next_block(dir, hash, frame, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 972 | frames, NULL); |
| 973 | if (retval < 0) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 974 | ext4_warning(sb, __FUNCTION__, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 975 | "error reading index page in directory #%lu", |
| 976 | dir->i_ino); |
| 977 | *err = retval; |
| 978 | goto errout; |
| 979 | } |
| 980 | } while (retval == 1); |
| 981 | |
| 982 | *err = -ENOENT; |
| 983 | errout: |
| 984 | dxtrace(printk("%s not found\n", name)); |
| 985 | dx_release (frames); |
| 986 | return NULL; |
| 987 | } |
| 988 | #endif |
| 989 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 990 | static struct dentry *ext4_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 991 | { |
| 992 | struct inode * inode; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 993 | struct ext4_dir_entry_2 * de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 994 | struct buffer_head * bh; |
| 995 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 996 | if (dentry->d_name.len > EXT4_NAME_LEN) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 997 | return ERR_PTR(-ENAMETOOLONG); |
| 998 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 999 | bh = ext4_find_entry(dentry, &de); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1000 | inode = NULL; |
| 1001 | if (bh) { |
| 1002 | unsigned long ino = le32_to_cpu(de->inode); |
| 1003 | brelse (bh); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1004 | if (!ext4_valid_inum(dir->i_sb, ino)) { |
| 1005 | ext4_error(dir->i_sb, "ext4_lookup", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1006 | "bad inode number: %lu", ino); |
| 1007 | inode = NULL; |
| 1008 | } else |
| 1009 | inode = iget(dir->i_sb, ino); |
| 1010 | |
| 1011 | if (!inode) |
| 1012 | return ERR_PTR(-EACCES); |
| 1013 | } |
| 1014 | return d_splice_alias(inode, dentry); |
| 1015 | } |
| 1016 | |
| 1017 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1018 | struct dentry *ext4_get_parent(struct dentry *child) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1019 | { |
| 1020 | unsigned long ino; |
| 1021 | struct dentry *parent; |
| 1022 | struct inode *inode; |
| 1023 | struct dentry dotdot; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1024 | struct ext4_dir_entry_2 * de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1025 | struct buffer_head *bh; |
| 1026 | |
| 1027 | dotdot.d_name.name = ".."; |
| 1028 | dotdot.d_name.len = 2; |
| 1029 | dotdot.d_parent = child; /* confusing, isn't it! */ |
| 1030 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1031 | bh = ext4_find_entry(&dotdot, &de); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1032 | inode = NULL; |
| 1033 | if (!bh) |
| 1034 | return ERR_PTR(-ENOENT); |
| 1035 | ino = le32_to_cpu(de->inode); |
| 1036 | brelse(bh); |
| 1037 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1038 | if (!ext4_valid_inum(child->d_inode->i_sb, ino)) { |
| 1039 | ext4_error(child->d_inode->i_sb, "ext4_get_parent", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1040 | "bad inode number: %lu", ino); |
| 1041 | inode = NULL; |
| 1042 | } else |
| 1043 | inode = iget(child->d_inode->i_sb, ino); |
| 1044 | |
| 1045 | if (!inode) |
| 1046 | return ERR_PTR(-EACCES); |
| 1047 | |
| 1048 | parent = d_alloc_anon(inode); |
| 1049 | if (!parent) { |
| 1050 | iput(inode); |
| 1051 | parent = ERR_PTR(-ENOMEM); |
| 1052 | } |
| 1053 | return parent; |
| 1054 | } |
| 1055 | |
| 1056 | #define S_SHIFT 12 |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1057 | static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { |
| 1058 | [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, |
| 1059 | [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, |
| 1060 | [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, |
| 1061 | [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, |
| 1062 | [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, |
| 1063 | [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, |
| 1064 | [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1065 | }; |
| 1066 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1067 | static inline void ext4_set_de_type(struct super_block *sb, |
| 1068 | struct ext4_dir_entry_2 *de, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1069 | umode_t mode) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1070 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE)) |
| 1071 | de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1072 | } |
| 1073 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1074 | #ifdef CONFIG_EXT4_INDEX |
| 1075 | static struct ext4_dir_entry_2 * |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1076 | dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count) |
| 1077 | { |
| 1078 | unsigned rec_len = 0; |
| 1079 | |
| 1080 | while (count--) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1081 | struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *) (from + map->offs); |
| 1082 | rec_len = EXT4_DIR_REC_LEN(de->name_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1083 | memcpy (to, de, rec_len); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1084 | ((struct ext4_dir_entry_2 *) to)->rec_len = |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1085 | cpu_to_le16(rec_len); |
| 1086 | de->inode = 0; |
| 1087 | map++; |
| 1088 | to += rec_len; |
| 1089 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1090 | return (struct ext4_dir_entry_2 *) (to - rec_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1091 | } |
| 1092 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1093 | static struct ext4_dir_entry_2* dx_pack_dirents(char *base, int size) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1094 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1095 | 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] | 1096 | unsigned rec_len = 0; |
| 1097 | |
| 1098 | prev = to = de; |
| 1099 | while ((char*)de < base + size) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1100 | next = (struct ext4_dir_entry_2 *) ((char *) de + |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1101 | le16_to_cpu(de->rec_len)); |
| 1102 | if (de->inode && de->name_len) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1103 | rec_len = EXT4_DIR_REC_LEN(de->name_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1104 | if (de > to) |
| 1105 | memmove(to, de, rec_len); |
| 1106 | to->rec_len = cpu_to_le16(rec_len); |
| 1107 | prev = to; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1108 | to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1109 | } |
| 1110 | de = next; |
| 1111 | } |
| 1112 | return prev; |
| 1113 | } |
| 1114 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1115 | 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] | 1116 | struct buffer_head **bh,struct dx_frame *frame, |
| 1117 | struct dx_hash_info *hinfo, int *error) |
| 1118 | { |
| 1119 | unsigned blocksize = dir->i_sb->s_blocksize; |
| 1120 | unsigned count, continued; |
| 1121 | struct buffer_head *bh2; |
| 1122 | u32 newblock; |
| 1123 | u32 hash2; |
| 1124 | struct dx_map_entry *map; |
| 1125 | char *data1 = (*bh)->b_data, *data2; |
| 1126 | unsigned split; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1127 | struct ext4_dir_entry_2 *de = NULL, *de2; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1128 | int err; |
| 1129 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1130 | bh2 = ext4_append (handle, dir, &newblock, error); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1131 | if (!(bh2)) { |
| 1132 | brelse(*bh); |
| 1133 | *bh = NULL; |
| 1134 | goto errout; |
| 1135 | } |
| 1136 | |
| 1137 | BUFFER_TRACE(*bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1138 | err = ext4_journal_get_write_access(handle, *bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1139 | if (err) { |
| 1140 | journal_error: |
| 1141 | brelse(*bh); |
| 1142 | brelse(bh2); |
| 1143 | *bh = NULL; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1144 | ext4_std_error(dir->i_sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1145 | goto errout; |
| 1146 | } |
| 1147 | BUFFER_TRACE(frame->bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1148 | err = ext4_journal_get_write_access(handle, frame->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1149 | if (err) |
| 1150 | goto journal_error; |
| 1151 | |
| 1152 | data2 = bh2->b_data; |
| 1153 | |
| 1154 | /* create map in the end of data2 block */ |
| 1155 | map = (struct dx_map_entry *) (data2 + blocksize); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1156 | count = dx_make_map ((struct ext4_dir_entry_2 *) data1, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1157 | blocksize, hinfo, map); |
| 1158 | map -= count; |
| 1159 | split = count/2; // need to adjust to actual middle |
| 1160 | dx_sort_map (map, count); |
| 1161 | hash2 = map[split].hash; |
| 1162 | continued = hash2 == map[split - 1].hash; |
| 1163 | dxtrace(printk("Split block %i at %x, %i/%i\n", |
| 1164 | dx_get_block(frame->at), hash2, split, count-split)); |
| 1165 | |
| 1166 | /* Fancy dance to stay within two buffers */ |
| 1167 | de2 = dx_move_dirents(data1, data2, map + split, count - split); |
| 1168 | de = dx_pack_dirents(data1,blocksize); |
| 1169 | de->rec_len = cpu_to_le16(data1 + blocksize - (char *) de); |
| 1170 | de2->rec_len = cpu_to_le16(data2 + blocksize - (char *) de2); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1171 | dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data1, blocksize, 1)); |
| 1172 | 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] | 1173 | |
| 1174 | /* Which block gets the new entry? */ |
| 1175 | if (hinfo->hash >= hash2) |
| 1176 | { |
| 1177 | swap(*bh, bh2); |
| 1178 | de = de2; |
| 1179 | } |
| 1180 | dx_insert_block (frame, hash2 + continued, newblock); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1181 | err = ext4_journal_dirty_metadata (handle, bh2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1182 | if (err) |
| 1183 | goto journal_error; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1184 | err = ext4_journal_dirty_metadata (handle, frame->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1185 | if (err) |
| 1186 | goto journal_error; |
| 1187 | brelse (bh2); |
| 1188 | dxtrace(dx_show_index ("frame", frame->entries)); |
| 1189 | errout: |
| 1190 | return de; |
| 1191 | } |
| 1192 | #endif |
| 1193 | |
| 1194 | |
| 1195 | /* |
| 1196 | * Add a new entry into a directory (leaf) block. If de is non-NULL, |
| 1197 | * it points to a directory entry which is guaranteed to be large |
| 1198 | * enough for new directory entry. If de is NULL, then |
| 1199 | * add_dirent_to_buf will attempt search the directory block for |
| 1200 | * space. It will return -ENOSPC if no space is available, and -EIO |
| 1201 | * and -EEXIST if directory entry already exists. |
| 1202 | * |
| 1203 | * NOTE! bh is NOT released in the case where ENOSPC is returned. In |
| 1204 | * all other cases bh is released. |
| 1205 | */ |
| 1206 | static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1207 | struct inode *inode, struct ext4_dir_entry_2 *de, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1208 | struct buffer_head * bh) |
| 1209 | { |
| 1210 | struct inode *dir = dentry->d_parent->d_inode; |
| 1211 | const char *name = dentry->d_name.name; |
| 1212 | int namelen = dentry->d_name.len; |
| 1213 | unsigned long offset = 0; |
| 1214 | unsigned short reclen; |
| 1215 | int nlen, rlen, err; |
| 1216 | char *top; |
| 1217 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1218 | reclen = EXT4_DIR_REC_LEN(namelen); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1219 | if (!de) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1220 | de = (struct ext4_dir_entry_2 *)bh->b_data; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1221 | top = bh->b_data + dir->i_sb->s_blocksize - reclen; |
| 1222 | while ((char *) de <= top) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1223 | if (!ext4_check_dir_entry("ext4_add_entry", dir, de, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1224 | bh, offset)) { |
| 1225 | brelse (bh); |
| 1226 | return -EIO; |
| 1227 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1228 | if (ext4_match (namelen, name, de)) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1229 | brelse (bh); |
| 1230 | return -EEXIST; |
| 1231 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1232 | nlen = EXT4_DIR_REC_LEN(de->name_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1233 | rlen = le16_to_cpu(de->rec_len); |
| 1234 | if ((de->inode? rlen - nlen: rlen) >= reclen) |
| 1235 | break; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1236 | de = (struct ext4_dir_entry_2 *)((char *)de + rlen); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1237 | offset += rlen; |
| 1238 | } |
| 1239 | if ((char *) de > top) |
| 1240 | return -ENOSPC; |
| 1241 | } |
| 1242 | BUFFER_TRACE(bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1243 | err = ext4_journal_get_write_access(handle, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1244 | if (err) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1245 | ext4_std_error(dir->i_sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1246 | brelse(bh); |
| 1247 | return err; |
| 1248 | } |
| 1249 | |
| 1250 | /* By now the buffer is marked for journaling */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1251 | nlen = EXT4_DIR_REC_LEN(de->name_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1252 | rlen = le16_to_cpu(de->rec_len); |
| 1253 | if (de->inode) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1254 | struct ext4_dir_entry_2 *de1 = (struct ext4_dir_entry_2 *)((char *)de + nlen); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1255 | de1->rec_len = cpu_to_le16(rlen - nlen); |
| 1256 | de->rec_len = cpu_to_le16(nlen); |
| 1257 | de = de1; |
| 1258 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1259 | de->file_type = EXT4_FT_UNKNOWN; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1260 | if (inode) { |
| 1261 | de->inode = cpu_to_le32(inode->i_ino); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1262 | ext4_set_de_type(dir->i_sb, de, inode->i_mode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1263 | } else |
| 1264 | de->inode = 0; |
| 1265 | de->name_len = namelen; |
| 1266 | memcpy (de->name, name, namelen); |
| 1267 | /* |
| 1268 | * XXX shouldn't update any times until successful |
| 1269 | * completion of syscall, but too many callers depend |
| 1270 | * on this. |
| 1271 | * |
| 1272 | * XXX similarly, too many callers depend on |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1273 | * ext4_new_inode() setting the times, but error |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1274 | * recovery deletes the inode, so the worst that can |
| 1275 | * happen is that the times are slightly out of date |
| 1276 | * and/or different from the directory change time. |
| 1277 | */ |
| 1278 | dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1279 | ext4_update_dx_flag(dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1280 | dir->i_version++; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1281 | ext4_mark_inode_dirty(handle, dir); |
| 1282 | BUFFER_TRACE(bh, "call ext4_journal_dirty_metadata"); |
| 1283 | err = ext4_journal_dirty_metadata(handle, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1284 | if (err) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1285 | ext4_std_error(dir->i_sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1286 | brelse(bh); |
| 1287 | return 0; |
| 1288 | } |
| 1289 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1290 | #ifdef CONFIG_EXT4_INDEX |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1291 | /* |
| 1292 | * This converts a one block unindexed directory to a 3 block indexed |
| 1293 | * directory, and adds the dentry to the indexed directory. |
| 1294 | */ |
| 1295 | static int make_indexed_dir(handle_t *handle, struct dentry *dentry, |
| 1296 | struct inode *inode, struct buffer_head *bh) |
| 1297 | { |
| 1298 | struct inode *dir = dentry->d_parent->d_inode; |
| 1299 | const char *name = dentry->d_name.name; |
| 1300 | int namelen = dentry->d_name.len; |
| 1301 | struct buffer_head *bh2; |
| 1302 | struct dx_root *root; |
| 1303 | struct dx_frame frames[2], *frame; |
| 1304 | struct dx_entry *entries; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1305 | struct ext4_dir_entry_2 *de, *de2; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1306 | char *data1, *top; |
| 1307 | unsigned len; |
| 1308 | int retval; |
| 1309 | unsigned blocksize; |
| 1310 | struct dx_hash_info hinfo; |
| 1311 | u32 block; |
| 1312 | struct fake_dirent *fde; |
| 1313 | |
| 1314 | blocksize = dir->i_sb->s_blocksize; |
| 1315 | dxtrace(printk("Creating index\n")); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1316 | retval = ext4_journal_get_write_access(handle, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1317 | if (retval) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1318 | ext4_std_error(dir->i_sb, retval); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1319 | brelse(bh); |
| 1320 | return retval; |
| 1321 | } |
| 1322 | root = (struct dx_root *) bh->b_data; |
| 1323 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1324 | bh2 = ext4_append (handle, dir, &block, &retval); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1325 | if (!(bh2)) { |
| 1326 | brelse(bh); |
| 1327 | return retval; |
| 1328 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1329 | EXT4_I(dir)->i_flags |= EXT4_INDEX_FL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1330 | data1 = bh2->b_data; |
| 1331 | |
| 1332 | /* The 0th block becomes the root, move the dirents out */ |
| 1333 | fde = &root->dotdot; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1334 | de = (struct ext4_dir_entry_2 *)((char *)fde + le16_to_cpu(fde->rec_len)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1335 | len = ((char *) root) + blocksize - (char *) de; |
| 1336 | memcpy (data1, de, len); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1337 | de = (struct ext4_dir_entry_2 *) data1; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1338 | top = data1 + len; |
| 1339 | while ((char *)(de2=(void*)de+le16_to_cpu(de->rec_len)) < top) |
| 1340 | de = de2; |
| 1341 | de->rec_len = cpu_to_le16(data1 + blocksize - (char *) de); |
| 1342 | /* Initialize the root; the dot dirents already exist */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1343 | de = (struct ext4_dir_entry_2 *) (&root->dotdot); |
| 1344 | de->rec_len = cpu_to_le16(blocksize - EXT4_DIR_REC_LEN(2)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1345 | memset (&root->info, 0, sizeof(root->info)); |
| 1346 | root->info.info_length = sizeof(root->info); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1347 | 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] | 1348 | entries = root->entries; |
| 1349 | dx_set_block (entries, 1); |
| 1350 | dx_set_count (entries, 1); |
| 1351 | dx_set_limit (entries, dx_root_limit(dir, sizeof(root->info))); |
| 1352 | |
| 1353 | /* Initialize as for dx_probe */ |
| 1354 | hinfo.hash_version = root->info.hash_version; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1355 | hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; |
| 1356 | ext4fs_dirhash(name, namelen, &hinfo); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1357 | frame = frames; |
| 1358 | frame->entries = entries; |
| 1359 | frame->at = entries; |
| 1360 | frame->bh = bh; |
| 1361 | bh = bh2; |
| 1362 | de = do_split(handle,dir, &bh, frame, &hinfo, &retval); |
| 1363 | dx_release (frames); |
| 1364 | if (!(de)) |
| 1365 | return retval; |
| 1366 | |
| 1367 | return add_dirent_to_buf(handle, dentry, inode, de, bh); |
| 1368 | } |
| 1369 | #endif |
| 1370 | |
| 1371 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1372 | * ext4_add_entry() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1373 | * |
| 1374 | * adds a file entry to the specified directory, using the same |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1375 | * semantics as ext4_find_entry(). It returns NULL if it failed. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1376 | * |
| 1377 | * NOTE!! The inode part of 'de' is left at 0 - which means you |
| 1378 | * may not sleep between calling this and putting something into |
| 1379 | * the entry, as someone else might have used it while you slept. |
| 1380 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1381 | static int ext4_add_entry (handle_t *handle, struct dentry *dentry, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1382 | struct inode *inode) |
| 1383 | { |
| 1384 | struct inode *dir = dentry->d_parent->d_inode; |
| 1385 | unsigned long offset; |
| 1386 | struct buffer_head * bh; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1387 | struct ext4_dir_entry_2 *de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1388 | struct super_block * sb; |
| 1389 | int retval; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1390 | #ifdef CONFIG_EXT4_INDEX |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1391 | int dx_fallback=0; |
| 1392 | #endif |
| 1393 | unsigned blocksize; |
| 1394 | u32 block, blocks; |
| 1395 | |
| 1396 | sb = dir->i_sb; |
| 1397 | blocksize = sb->s_blocksize; |
| 1398 | if (!dentry->d_name.len) |
| 1399 | return -EINVAL; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1400 | #ifdef CONFIG_EXT4_INDEX |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1401 | if (is_dx(dir)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1402 | retval = ext4_dx_add_entry(handle, dentry, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1403 | if (!retval || (retval != ERR_BAD_DX_DIR)) |
| 1404 | return retval; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1405 | EXT4_I(dir)->i_flags &= ~EXT4_INDEX_FL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1406 | dx_fallback++; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1407 | ext4_mark_inode_dirty(handle, dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1408 | } |
| 1409 | #endif |
| 1410 | blocks = dir->i_size >> sb->s_blocksize_bits; |
| 1411 | for (block = 0, offset = 0; block < blocks; block++) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1412 | bh = ext4_bread(handle, dir, block, 0, &retval); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1413 | if(!bh) |
| 1414 | return retval; |
| 1415 | retval = add_dirent_to_buf(handle, dentry, inode, NULL, bh); |
| 1416 | if (retval != -ENOSPC) |
| 1417 | return retval; |
| 1418 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1419 | #ifdef CONFIG_EXT4_INDEX |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1420 | if (blocks == 1 && !dx_fallback && |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1421 | EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1422 | return make_indexed_dir(handle, dentry, inode, bh); |
| 1423 | #endif |
| 1424 | brelse(bh); |
| 1425 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1426 | bh = ext4_append(handle, dir, &block, &retval); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1427 | if (!bh) |
| 1428 | return retval; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1429 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1430 | de->inode = 0; |
| 1431 | de->rec_len = cpu_to_le16(blocksize); |
| 1432 | return add_dirent_to_buf(handle, dentry, inode, de, bh); |
| 1433 | } |
| 1434 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1435 | #ifdef CONFIG_EXT4_INDEX |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1436 | /* |
| 1437 | * Returns 0 for success, or a negative error value |
| 1438 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1439 | static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1440 | struct inode *inode) |
| 1441 | { |
| 1442 | struct dx_frame frames[2], *frame; |
| 1443 | struct dx_entry *entries, *at; |
| 1444 | struct dx_hash_info hinfo; |
| 1445 | struct buffer_head * bh; |
| 1446 | struct inode *dir = dentry->d_parent->d_inode; |
| 1447 | struct super_block * sb = dir->i_sb; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1448 | struct ext4_dir_entry_2 *de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1449 | int err; |
| 1450 | |
| 1451 | frame = dx_probe(dentry, NULL, &hinfo, frames, &err); |
| 1452 | if (!frame) |
| 1453 | return err; |
| 1454 | entries = frame->entries; |
| 1455 | at = frame->at; |
| 1456 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1457 | if (!(bh = ext4_bread(handle,dir, dx_get_block(frame->at), 0, &err))) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1458 | goto cleanup; |
| 1459 | |
| 1460 | BUFFER_TRACE(bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1461 | err = ext4_journal_get_write_access(handle, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1462 | if (err) |
| 1463 | goto journal_error; |
| 1464 | |
| 1465 | err = add_dirent_to_buf(handle, dentry, inode, NULL, bh); |
| 1466 | if (err != -ENOSPC) { |
| 1467 | bh = NULL; |
| 1468 | goto cleanup; |
| 1469 | } |
| 1470 | |
| 1471 | /* Block full, should compress but for now just split */ |
| 1472 | dxtrace(printk("using %u of %u node entries\n", |
| 1473 | dx_get_count(entries), dx_get_limit(entries))); |
| 1474 | /* Need to split index? */ |
| 1475 | if (dx_get_count(entries) == dx_get_limit(entries)) { |
| 1476 | u32 newblock; |
| 1477 | unsigned icount = dx_get_count(entries); |
| 1478 | int levels = frame - frames; |
| 1479 | struct dx_entry *entries2; |
| 1480 | struct dx_node *node2; |
| 1481 | struct buffer_head *bh2; |
| 1482 | |
| 1483 | if (levels && (dx_get_count(frames->entries) == |
| 1484 | dx_get_limit(frames->entries))) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1485 | ext4_warning(sb, __FUNCTION__, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1486 | "Directory index full!"); |
| 1487 | err = -ENOSPC; |
| 1488 | goto cleanup; |
| 1489 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1490 | bh2 = ext4_append (handle, dir, &newblock, &err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1491 | if (!(bh2)) |
| 1492 | goto cleanup; |
| 1493 | node2 = (struct dx_node *)(bh2->b_data); |
| 1494 | entries2 = node2->entries; |
| 1495 | node2->fake.rec_len = cpu_to_le16(sb->s_blocksize); |
| 1496 | node2->fake.inode = 0; |
| 1497 | BUFFER_TRACE(frame->bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1498 | err = ext4_journal_get_write_access(handle, frame->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1499 | if (err) |
| 1500 | goto journal_error; |
| 1501 | if (levels) { |
| 1502 | unsigned icount1 = icount/2, icount2 = icount - icount1; |
| 1503 | unsigned hash2 = dx_get_hash(entries + icount1); |
| 1504 | dxtrace(printk("Split index %i/%i\n", icount1, icount2)); |
| 1505 | |
| 1506 | BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1507 | err = ext4_journal_get_write_access(handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1508 | frames[0].bh); |
| 1509 | if (err) |
| 1510 | goto journal_error; |
| 1511 | |
| 1512 | memcpy ((char *) entries2, (char *) (entries + icount1), |
| 1513 | icount2 * sizeof(struct dx_entry)); |
| 1514 | dx_set_count (entries, icount1); |
| 1515 | dx_set_count (entries2, icount2); |
| 1516 | dx_set_limit (entries2, dx_node_limit(dir)); |
| 1517 | |
| 1518 | /* Which index block gets the new entry? */ |
| 1519 | if (at - entries >= icount1) { |
| 1520 | frame->at = at = at - entries - icount1 + entries2; |
| 1521 | frame->entries = entries = entries2; |
| 1522 | swap(frame->bh, bh2); |
| 1523 | } |
| 1524 | dx_insert_block (frames + 0, hash2, newblock); |
| 1525 | dxtrace(dx_show_index ("node", frames[1].entries)); |
| 1526 | dxtrace(dx_show_index ("node", |
| 1527 | ((struct dx_node *) bh2->b_data)->entries)); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1528 | err = ext4_journal_dirty_metadata(handle, bh2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1529 | if (err) |
| 1530 | goto journal_error; |
| 1531 | brelse (bh2); |
| 1532 | } else { |
| 1533 | dxtrace(printk("Creating second level index...\n")); |
| 1534 | memcpy((char *) entries2, (char *) entries, |
| 1535 | icount * sizeof(struct dx_entry)); |
| 1536 | dx_set_limit(entries2, dx_node_limit(dir)); |
| 1537 | |
| 1538 | /* Set up root */ |
| 1539 | dx_set_count(entries, 1); |
| 1540 | dx_set_block(entries + 0, newblock); |
| 1541 | ((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels = 1; |
| 1542 | |
| 1543 | /* Add new access path frame */ |
| 1544 | frame = frames + 1; |
| 1545 | frame->at = at = at - entries + entries2; |
| 1546 | frame->entries = entries = entries2; |
| 1547 | frame->bh = bh2; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1548 | err = ext4_journal_get_write_access(handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1549 | frame->bh); |
| 1550 | if (err) |
| 1551 | goto journal_error; |
| 1552 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1553 | ext4_journal_dirty_metadata(handle, frames[0].bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1554 | } |
| 1555 | de = do_split(handle, dir, &bh, frame, &hinfo, &err); |
| 1556 | if (!de) |
| 1557 | goto cleanup; |
| 1558 | err = add_dirent_to_buf(handle, dentry, inode, de, bh); |
| 1559 | bh = NULL; |
| 1560 | goto cleanup; |
| 1561 | |
| 1562 | journal_error: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1563 | ext4_std_error(dir->i_sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1564 | cleanup: |
| 1565 | if (bh) |
| 1566 | brelse(bh); |
| 1567 | dx_release(frames); |
| 1568 | return err; |
| 1569 | } |
| 1570 | #endif |
| 1571 | |
| 1572 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1573 | * ext4_delete_entry deletes a directory entry by merging it with the |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1574 | * previous entry |
| 1575 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1576 | static int ext4_delete_entry (handle_t *handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1577 | struct inode * dir, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1578 | struct ext4_dir_entry_2 * de_del, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1579 | struct buffer_head * bh) |
| 1580 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1581 | struct ext4_dir_entry_2 * de, * pde; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1582 | int i; |
| 1583 | |
| 1584 | i = 0; |
| 1585 | pde = NULL; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1586 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1587 | while (i < bh->b_size) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1588 | if (!ext4_check_dir_entry("ext4_delete_entry", dir, de, bh, i)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1589 | return -EIO; |
| 1590 | if (de == de_del) { |
| 1591 | BUFFER_TRACE(bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1592 | ext4_journal_get_write_access(handle, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1593 | if (pde) |
| 1594 | pde->rec_len = |
| 1595 | cpu_to_le16(le16_to_cpu(pde->rec_len) + |
| 1596 | le16_to_cpu(de->rec_len)); |
| 1597 | else |
| 1598 | de->inode = 0; |
| 1599 | dir->i_version++; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1600 | BUFFER_TRACE(bh, "call ext4_journal_dirty_metadata"); |
| 1601 | ext4_journal_dirty_metadata(handle, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1602 | return 0; |
| 1603 | } |
| 1604 | i += le16_to_cpu(de->rec_len); |
| 1605 | pde = de; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1606 | de = (struct ext4_dir_entry_2 *) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1607 | ((char *) de + le16_to_cpu(de->rec_len)); |
| 1608 | } |
| 1609 | return -ENOENT; |
| 1610 | } |
| 1611 | |
| 1612 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1613 | * ext4_mark_inode_dirty is somewhat expensive, so unlike ext2 we |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1614 | * do not perform it in these functions. We perform it at the call site, |
| 1615 | * if it is needed. |
| 1616 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1617 | static inline void ext4_inc_count(handle_t *handle, struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1618 | { |
| 1619 | inc_nlink(inode); |
| 1620 | } |
| 1621 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1622 | static inline void ext4_dec_count(handle_t *handle, struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1623 | { |
| 1624 | drop_nlink(inode); |
| 1625 | } |
| 1626 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1627 | static int ext4_add_nondir(handle_t *handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1628 | struct dentry *dentry, struct inode *inode) |
| 1629 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1630 | int err = ext4_add_entry(handle, dentry, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1631 | if (!err) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1632 | ext4_mark_inode_dirty(handle, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1633 | d_instantiate(dentry, inode); |
| 1634 | return 0; |
| 1635 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1636 | ext4_dec_count(handle, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1637 | iput(inode); |
| 1638 | return err; |
| 1639 | } |
| 1640 | |
| 1641 | /* |
| 1642 | * By the time this is called, we already have created |
| 1643 | * the directory cache entry for the new file, but it |
| 1644 | * is so far negative - it has no inode. |
| 1645 | * |
| 1646 | * If the create succeeds, we fill in the inode information |
| 1647 | * with d_instantiate(). |
| 1648 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1649 | static int ext4_create (struct inode * dir, struct dentry * dentry, int mode, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1650 | struct nameidata *nd) |
| 1651 | { |
| 1652 | handle_t *handle; |
| 1653 | struct inode * inode; |
| 1654 | int err, retries = 0; |
| 1655 | |
| 1656 | retry: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1657 | handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
| 1658 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 + |
| 1659 | 2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1660 | if (IS_ERR(handle)) |
| 1661 | return PTR_ERR(handle); |
| 1662 | |
| 1663 | if (IS_DIRSYNC(dir)) |
| 1664 | handle->h_sync = 1; |
| 1665 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1666 | inode = ext4_new_inode (handle, dir, mode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1667 | err = PTR_ERR(inode); |
| 1668 | if (!IS_ERR(inode)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1669 | inode->i_op = &ext4_file_inode_operations; |
| 1670 | inode->i_fop = &ext4_file_operations; |
| 1671 | ext4_set_aops(inode); |
| 1672 | err = ext4_add_nondir(handle, dentry, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1673 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1674 | ext4_journal_stop(handle); |
| 1675 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1676 | goto retry; |
| 1677 | return err; |
| 1678 | } |
| 1679 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1680 | static int ext4_mknod (struct inode * dir, struct dentry *dentry, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1681 | int mode, dev_t rdev) |
| 1682 | { |
| 1683 | handle_t *handle; |
| 1684 | struct inode *inode; |
| 1685 | int err, retries = 0; |
| 1686 | |
| 1687 | if (!new_valid_dev(rdev)) |
| 1688 | return -EINVAL; |
| 1689 | |
| 1690 | retry: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1691 | handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
| 1692 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 + |
| 1693 | 2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1694 | if (IS_ERR(handle)) |
| 1695 | return PTR_ERR(handle); |
| 1696 | |
| 1697 | if (IS_DIRSYNC(dir)) |
| 1698 | handle->h_sync = 1; |
| 1699 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1700 | inode = ext4_new_inode (handle, dir, mode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1701 | err = PTR_ERR(inode); |
| 1702 | if (!IS_ERR(inode)) { |
| 1703 | init_special_inode(inode, inode->i_mode, rdev); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1704 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
| 1705 | inode->i_op = &ext4_special_inode_operations; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1706 | #endif |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1707 | err = ext4_add_nondir(handle, dentry, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1708 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1709 | ext4_journal_stop(handle); |
| 1710 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1711 | goto retry; |
| 1712 | return err; |
| 1713 | } |
| 1714 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1715 | static int ext4_mkdir(struct inode * dir, struct dentry * dentry, int mode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1716 | { |
| 1717 | handle_t *handle; |
| 1718 | struct inode * inode; |
| 1719 | struct buffer_head * dir_block; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1720 | struct ext4_dir_entry_2 * de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1721 | int err, retries = 0; |
| 1722 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1723 | if (dir->i_nlink >= EXT4_LINK_MAX) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1724 | return -EMLINK; |
| 1725 | |
| 1726 | retry: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1727 | handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
| 1728 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 + |
| 1729 | 2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1730 | if (IS_ERR(handle)) |
| 1731 | return PTR_ERR(handle); |
| 1732 | |
| 1733 | if (IS_DIRSYNC(dir)) |
| 1734 | handle->h_sync = 1; |
| 1735 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1736 | inode = ext4_new_inode (handle, dir, S_IFDIR | mode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1737 | err = PTR_ERR(inode); |
| 1738 | if (IS_ERR(inode)) |
| 1739 | goto out_stop; |
| 1740 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1741 | inode->i_op = &ext4_dir_inode_operations; |
| 1742 | inode->i_fop = &ext4_dir_operations; |
| 1743 | inode->i_size = EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize; |
| 1744 | dir_block = ext4_bread (handle, inode, 0, 1, &err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1745 | if (!dir_block) { |
| 1746 | drop_nlink(inode); /* is this nlink == 0? */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1747 | ext4_mark_inode_dirty(handle, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1748 | iput (inode); |
| 1749 | goto out_stop; |
| 1750 | } |
| 1751 | BUFFER_TRACE(dir_block, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1752 | ext4_journal_get_write_access(handle, dir_block); |
| 1753 | de = (struct ext4_dir_entry_2 *) dir_block->b_data; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1754 | de->inode = cpu_to_le32(inode->i_ino); |
| 1755 | de->name_len = 1; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1756 | de->rec_len = cpu_to_le16(EXT4_DIR_REC_LEN(de->name_len)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1757 | strcpy (de->name, "."); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1758 | ext4_set_de_type(dir->i_sb, de, S_IFDIR); |
| 1759 | de = (struct ext4_dir_entry_2 *) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1760 | ((char *) de + le16_to_cpu(de->rec_len)); |
| 1761 | de->inode = cpu_to_le32(dir->i_ino); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1762 | de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize-EXT4_DIR_REC_LEN(1)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1763 | de->name_len = 2; |
| 1764 | strcpy (de->name, ".."); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1765 | ext4_set_de_type(dir->i_sb, de, S_IFDIR); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1766 | inode->i_nlink = 2; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1767 | BUFFER_TRACE(dir_block, "call ext4_journal_dirty_metadata"); |
| 1768 | ext4_journal_dirty_metadata(handle, dir_block); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1769 | brelse (dir_block); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1770 | ext4_mark_inode_dirty(handle, inode); |
| 1771 | err = ext4_add_entry (handle, dentry, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1772 | if (err) { |
| 1773 | inode->i_nlink = 0; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1774 | ext4_mark_inode_dirty(handle, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1775 | iput (inode); |
| 1776 | goto out_stop; |
| 1777 | } |
| 1778 | inc_nlink(dir); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1779 | ext4_update_dx_flag(dir); |
| 1780 | ext4_mark_inode_dirty(handle, dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1781 | d_instantiate(dentry, inode); |
| 1782 | out_stop: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1783 | ext4_journal_stop(handle); |
| 1784 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1785 | goto retry; |
| 1786 | return err; |
| 1787 | } |
| 1788 | |
| 1789 | /* |
| 1790 | * routine to check that the specified directory is empty (for rmdir) |
| 1791 | */ |
| 1792 | static int empty_dir (struct inode * inode) |
| 1793 | { |
| 1794 | unsigned long offset; |
| 1795 | struct buffer_head * bh; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1796 | struct ext4_dir_entry_2 * de, * de1; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1797 | struct super_block * sb; |
| 1798 | int err = 0; |
| 1799 | |
| 1800 | sb = inode->i_sb; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1801 | if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2) || |
| 1802 | !(bh = ext4_bread (NULL, inode, 0, 0, &err))) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1803 | if (err) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1804 | ext4_error(inode->i_sb, __FUNCTION__, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1805 | "error %d reading directory #%lu offset 0", |
| 1806 | err, inode->i_ino); |
| 1807 | else |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1808 | ext4_warning(inode->i_sb, __FUNCTION__, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1809 | "bad directory (dir #%lu) - no data block", |
| 1810 | inode->i_ino); |
| 1811 | return 1; |
| 1812 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1813 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
| 1814 | de1 = (struct ext4_dir_entry_2 *) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1815 | ((char *) de + le16_to_cpu(de->rec_len)); |
| 1816 | if (le32_to_cpu(de->inode) != inode->i_ino || |
| 1817 | !le32_to_cpu(de1->inode) || |
| 1818 | strcmp (".", de->name) || |
| 1819 | strcmp ("..", de1->name)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1820 | ext4_warning (inode->i_sb, "empty_dir", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1821 | "bad directory (dir #%lu) - no `.' or `..'", |
| 1822 | inode->i_ino); |
| 1823 | brelse (bh); |
| 1824 | return 1; |
| 1825 | } |
| 1826 | offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1827 | de = (struct ext4_dir_entry_2 *) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1828 | ((char *) de1 + le16_to_cpu(de1->rec_len)); |
| 1829 | while (offset < inode->i_size ) { |
| 1830 | if (!bh || |
| 1831 | (void *) de >= (void *) (bh->b_data+sb->s_blocksize)) { |
| 1832 | err = 0; |
| 1833 | brelse (bh); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1834 | bh = ext4_bread (NULL, inode, |
| 1835 | offset >> EXT4_BLOCK_SIZE_BITS(sb), 0, &err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1836 | if (!bh) { |
| 1837 | if (err) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1838 | ext4_error(sb, __FUNCTION__, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1839 | "error %d reading directory" |
| 1840 | " #%lu offset %lu", |
| 1841 | err, inode->i_ino, offset); |
| 1842 | offset += sb->s_blocksize; |
| 1843 | continue; |
| 1844 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1845 | de = (struct ext4_dir_entry_2 *) bh->b_data; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1846 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1847 | if (!ext4_check_dir_entry("empty_dir", inode, de, bh, offset)) { |
| 1848 | de = (struct ext4_dir_entry_2 *)(bh->b_data + |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1849 | sb->s_blocksize); |
| 1850 | offset = (offset | (sb->s_blocksize - 1)) + 1; |
| 1851 | continue; |
| 1852 | } |
| 1853 | if (le32_to_cpu(de->inode)) { |
| 1854 | brelse (bh); |
| 1855 | return 0; |
| 1856 | } |
| 1857 | offset += le16_to_cpu(de->rec_len); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1858 | de = (struct ext4_dir_entry_2 *) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1859 | ((char *) de + le16_to_cpu(de->rec_len)); |
| 1860 | } |
| 1861 | brelse (bh); |
| 1862 | return 1; |
| 1863 | } |
| 1864 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1865 | /* 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] | 1866 | * such inodes, starting at the superblock, in case we crash before the |
| 1867 | * file is closed/deleted, or in case the inode truncate spans multiple |
| 1868 | * transactions and the last transaction is not recovered after a crash. |
| 1869 | * |
| 1870 | * At filesystem recovery time, we walk this list deleting unlinked |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1871 | * inodes and truncating linked inodes in ext4_orphan_cleanup(). |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1872 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1873 | int ext4_orphan_add(handle_t *handle, struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1874 | { |
| 1875 | struct super_block *sb = inode->i_sb; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1876 | struct ext4_iloc iloc; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1877 | int err = 0, rc; |
| 1878 | |
| 1879 | lock_super(sb); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1880 | if (!list_empty(&EXT4_I(inode)->i_orphan)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1881 | goto out_unlock; |
| 1882 | |
| 1883 | /* Orphan handling is only valid for files with data blocks |
| 1884 | * being truncated, or files being unlinked. */ |
| 1885 | |
| 1886 | /* @@@ FIXME: Observation from aviro: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1887 | * I think I can trigger J_ASSERT in ext4_orphan_add(). We block |
| 1888 | * here (on lock_super()), so race with ext4_link() which might bump |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1889 | * ->i_nlink. For, say it, character device. Not a regular file, |
| 1890 | * not a directory, not a symlink and ->i_nlink > 0. |
| 1891 | */ |
| 1892 | J_ASSERT ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
| 1893 | S_ISLNK(inode->i_mode)) || inode->i_nlink == 0); |
| 1894 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1895 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
| 1896 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1897 | if (err) |
| 1898 | goto out_unlock; |
| 1899 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1900 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1901 | if (err) |
| 1902 | goto out_unlock; |
| 1903 | |
| 1904 | /* Insert this inode at the head of the on-disk orphan list... */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1905 | NEXT_ORPHAN(inode) = le32_to_cpu(EXT4_SB(sb)->s_es->s_last_orphan); |
| 1906 | EXT4_SB(sb)->s_es->s_last_orphan = cpu_to_le32(inode->i_ino); |
| 1907 | err = ext4_journal_dirty_metadata(handle, EXT4_SB(sb)->s_sbh); |
| 1908 | rc = ext4_mark_iloc_dirty(handle, inode, &iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1909 | if (!err) |
| 1910 | err = rc; |
| 1911 | |
| 1912 | /* Only add to the head of the in-memory list if all the |
| 1913 | * previous operations succeeded. If the orphan_add is going to |
| 1914 | * fail (possibly taking the journal offline), we can't risk |
| 1915 | * leaving the inode on the orphan list: stray orphan-list |
| 1916 | * entries can cause panics at unmount time. |
| 1917 | * |
| 1918 | * This is safe: on error we're going to ignore the orphan list |
| 1919 | * anyway on the next recovery. */ |
| 1920 | if (!err) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1921 | list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1922 | |
| 1923 | jbd_debug(4, "superblock will point to %lu\n", inode->i_ino); |
| 1924 | jbd_debug(4, "orphan inode %lu will point to %d\n", |
| 1925 | inode->i_ino, NEXT_ORPHAN(inode)); |
| 1926 | out_unlock: |
| 1927 | unlock_super(sb); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1928 | ext4_std_error(inode->i_sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1929 | return err; |
| 1930 | } |
| 1931 | |
| 1932 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1933 | * ext4_orphan_del() removes an unlinked or truncated inode from the list |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1934 | * of such inodes stored on disk, because it is finally being cleaned up. |
| 1935 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1936 | int ext4_orphan_del(handle_t *handle, struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1937 | { |
| 1938 | struct list_head *prev; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1939 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 1940 | struct ext4_sb_info *sbi; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1941 | unsigned long ino_next; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1942 | struct ext4_iloc iloc; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1943 | int err = 0; |
| 1944 | |
| 1945 | lock_super(inode->i_sb); |
| 1946 | if (list_empty(&ei->i_orphan)) { |
| 1947 | unlock_super(inode->i_sb); |
| 1948 | return 0; |
| 1949 | } |
| 1950 | |
| 1951 | ino_next = NEXT_ORPHAN(inode); |
| 1952 | prev = ei->i_orphan.prev; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1953 | sbi = EXT4_SB(inode->i_sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1954 | |
| 1955 | jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino); |
| 1956 | |
| 1957 | list_del_init(&ei->i_orphan); |
| 1958 | |
| 1959 | /* If we're on an error path, we may not have a valid |
| 1960 | * transaction handle with which to update the orphan list on |
| 1961 | * disk, but we still need to remove the inode from the linked |
| 1962 | * list in memory. */ |
| 1963 | if (!handle) |
| 1964 | goto out; |
| 1965 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1966 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1967 | if (err) |
| 1968 | goto out_err; |
| 1969 | |
| 1970 | if (prev == &sbi->s_orphan) { |
| 1971 | jbd_debug(4, "superblock will point to %lu\n", ino_next); |
| 1972 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1973 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1974 | if (err) |
| 1975 | goto out_brelse; |
| 1976 | sbi->s_es->s_last_orphan = cpu_to_le32(ino_next); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1977 | err = ext4_journal_dirty_metadata(handle, sbi->s_sbh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1978 | } else { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1979 | struct ext4_iloc iloc2; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1980 | struct inode *i_prev = |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1981 | &list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1982 | |
| 1983 | jbd_debug(4, "orphan inode %lu will point to %lu\n", |
| 1984 | i_prev->i_ino, ino_next); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1985 | err = ext4_reserve_inode_write(handle, i_prev, &iloc2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1986 | if (err) |
| 1987 | goto out_brelse; |
| 1988 | NEXT_ORPHAN(i_prev) = ino_next; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1989 | err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1990 | } |
| 1991 | if (err) |
| 1992 | goto out_brelse; |
| 1993 | NEXT_ORPHAN(inode) = 0; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1994 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1995 | |
| 1996 | out_err: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1997 | ext4_std_error(inode->i_sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1998 | out: |
| 1999 | unlock_super(inode->i_sb); |
| 2000 | return err; |
| 2001 | |
| 2002 | out_brelse: |
| 2003 | brelse(iloc.bh); |
| 2004 | goto out_err; |
| 2005 | } |
| 2006 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2007 | static int ext4_rmdir (struct inode * dir, struct dentry *dentry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2008 | { |
| 2009 | int retval; |
| 2010 | struct inode * inode; |
| 2011 | struct buffer_head * bh; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2012 | struct ext4_dir_entry_2 * de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2013 | handle_t *handle; |
| 2014 | |
| 2015 | /* Initialize quotas before so that eventual writes go in |
| 2016 | * separate transaction */ |
| 2017 | DQUOT_INIT(dentry->d_inode); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2018 | handle = ext4_journal_start(dir, EXT4_DELETE_TRANS_BLOCKS(dir->i_sb)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2019 | if (IS_ERR(handle)) |
| 2020 | return PTR_ERR(handle); |
| 2021 | |
| 2022 | retval = -ENOENT; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2023 | bh = ext4_find_entry (dentry, &de); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2024 | if (!bh) |
| 2025 | goto end_rmdir; |
| 2026 | |
| 2027 | if (IS_DIRSYNC(dir)) |
| 2028 | handle->h_sync = 1; |
| 2029 | |
| 2030 | inode = dentry->d_inode; |
| 2031 | |
| 2032 | retval = -EIO; |
| 2033 | if (le32_to_cpu(de->inode) != inode->i_ino) |
| 2034 | goto end_rmdir; |
| 2035 | |
| 2036 | retval = -ENOTEMPTY; |
| 2037 | if (!empty_dir (inode)) |
| 2038 | goto end_rmdir; |
| 2039 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2040 | retval = ext4_delete_entry(handle, dir, de, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2041 | if (retval) |
| 2042 | goto end_rmdir; |
| 2043 | if (inode->i_nlink != 2) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2044 | ext4_warning (inode->i_sb, "ext4_rmdir", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2045 | "empty directory has nlink!=2 (%d)", |
| 2046 | inode->i_nlink); |
| 2047 | inode->i_version++; |
| 2048 | clear_nlink(inode); |
| 2049 | /* There's no need to set i_disksize: the fact that i_nlink is |
| 2050 | * zero will ensure that the right thing happens during any |
| 2051 | * recovery. */ |
| 2052 | inode->i_size = 0; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2053 | ext4_orphan_add(handle, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2054 | inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2055 | ext4_mark_inode_dirty(handle, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2056 | drop_nlink(dir); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2057 | ext4_update_dx_flag(dir); |
| 2058 | ext4_mark_inode_dirty(handle, dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2059 | |
| 2060 | end_rmdir: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2061 | ext4_journal_stop(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2062 | brelse (bh); |
| 2063 | return retval; |
| 2064 | } |
| 2065 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2066 | static int ext4_unlink(struct inode * dir, struct dentry *dentry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2067 | { |
| 2068 | int retval; |
| 2069 | struct inode * inode; |
| 2070 | struct buffer_head * bh; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2071 | struct ext4_dir_entry_2 * de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2072 | handle_t *handle; |
| 2073 | |
| 2074 | /* Initialize quotas before so that eventual writes go |
| 2075 | * in separate transaction */ |
| 2076 | DQUOT_INIT(dentry->d_inode); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2077 | handle = ext4_journal_start(dir, EXT4_DELETE_TRANS_BLOCKS(dir->i_sb)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2078 | if (IS_ERR(handle)) |
| 2079 | return PTR_ERR(handle); |
| 2080 | |
| 2081 | if (IS_DIRSYNC(dir)) |
| 2082 | handle->h_sync = 1; |
| 2083 | |
| 2084 | retval = -ENOENT; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2085 | bh = ext4_find_entry (dentry, &de); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2086 | if (!bh) |
| 2087 | goto end_unlink; |
| 2088 | |
| 2089 | inode = dentry->d_inode; |
| 2090 | |
| 2091 | retval = -EIO; |
| 2092 | if (le32_to_cpu(de->inode) != inode->i_ino) |
| 2093 | goto end_unlink; |
| 2094 | |
| 2095 | if (!inode->i_nlink) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2096 | ext4_warning (inode->i_sb, "ext4_unlink", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2097 | "Deleting nonexistent file (%lu), %d", |
| 2098 | inode->i_ino, inode->i_nlink); |
| 2099 | inode->i_nlink = 1; |
| 2100 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2101 | retval = ext4_delete_entry(handle, dir, de, bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2102 | if (retval) |
| 2103 | goto end_unlink; |
| 2104 | dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2105 | ext4_update_dx_flag(dir); |
| 2106 | ext4_mark_inode_dirty(handle, dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2107 | drop_nlink(inode); |
| 2108 | if (!inode->i_nlink) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2109 | ext4_orphan_add(handle, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2110 | inode->i_ctime = dir->i_ctime; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2111 | ext4_mark_inode_dirty(handle, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2112 | retval = 0; |
| 2113 | |
| 2114 | end_unlink: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2115 | ext4_journal_stop(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2116 | brelse (bh); |
| 2117 | return retval; |
| 2118 | } |
| 2119 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2120 | static int ext4_symlink (struct inode * dir, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2121 | struct dentry *dentry, const char * symname) |
| 2122 | { |
| 2123 | handle_t *handle; |
| 2124 | struct inode * inode; |
| 2125 | int l, err, retries = 0; |
| 2126 | |
| 2127 | l = strlen(symname)+1; |
| 2128 | if (l > dir->i_sb->s_blocksize) |
| 2129 | return -ENAMETOOLONG; |
| 2130 | |
| 2131 | retry: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2132 | handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
| 2133 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 5 + |
| 2134 | 2*EXT4_QUOTA_INIT_BLOCKS(dir->i_sb)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2135 | if (IS_ERR(handle)) |
| 2136 | return PTR_ERR(handle); |
| 2137 | |
| 2138 | if (IS_DIRSYNC(dir)) |
| 2139 | handle->h_sync = 1; |
| 2140 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2141 | inode = ext4_new_inode (handle, dir, S_IFLNK|S_IRWXUGO); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2142 | err = PTR_ERR(inode); |
| 2143 | if (IS_ERR(inode)) |
| 2144 | goto out_stop; |
| 2145 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2146 | if (l > sizeof (EXT4_I(inode)->i_data)) { |
| 2147 | inode->i_op = &ext4_symlink_inode_operations; |
| 2148 | ext4_set_aops(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2149 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2150 | * page_symlink() calls into ext4_prepare/commit_write. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2151 | * We have a transaction open. All is sweetness. It also sets |
| 2152 | * i_size in generic_commit_write(). |
| 2153 | */ |
| 2154 | err = __page_symlink(inode, symname, l, |
| 2155 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); |
| 2156 | if (err) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2157 | ext4_dec_count(handle, inode); |
| 2158 | ext4_mark_inode_dirty(handle, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2159 | iput (inode); |
| 2160 | goto out_stop; |
| 2161 | } |
| 2162 | } else { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2163 | inode->i_op = &ext4_fast_symlink_inode_operations; |
| 2164 | memcpy((char*)&EXT4_I(inode)->i_data,symname,l); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2165 | inode->i_size = l-1; |
| 2166 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2167 | EXT4_I(inode)->i_disksize = inode->i_size; |
| 2168 | err = ext4_add_nondir(handle, dentry, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2169 | out_stop: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2170 | ext4_journal_stop(handle); |
| 2171 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2172 | goto retry; |
| 2173 | return err; |
| 2174 | } |
| 2175 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2176 | static int ext4_link (struct dentry * old_dentry, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2177 | struct inode * dir, struct dentry *dentry) |
| 2178 | { |
| 2179 | handle_t *handle; |
| 2180 | struct inode *inode = old_dentry->d_inode; |
| 2181 | int err, retries = 0; |
| 2182 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2183 | if (inode->i_nlink >= EXT4_LINK_MAX) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2184 | return -EMLINK; |
| 2185 | |
| 2186 | retry: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2187 | handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) + |
| 2188 | EXT4_INDEX_EXTRA_TRANS_BLOCKS); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2189 | if (IS_ERR(handle)) |
| 2190 | return PTR_ERR(handle); |
| 2191 | |
| 2192 | if (IS_DIRSYNC(dir)) |
| 2193 | handle->h_sync = 1; |
| 2194 | |
| 2195 | inode->i_ctime = CURRENT_TIME_SEC; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2196 | ext4_inc_count(handle, inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2197 | atomic_inc(&inode->i_count); |
| 2198 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2199 | err = ext4_add_nondir(handle, dentry, inode); |
| 2200 | ext4_journal_stop(handle); |
| 2201 | if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2202 | goto retry; |
| 2203 | return err; |
| 2204 | } |
| 2205 | |
| 2206 | #define PARENT_INO(buffer) \ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2207 | ((struct ext4_dir_entry_2 *) ((char *) buffer + \ |
| 2208 | le16_to_cpu(((struct ext4_dir_entry_2 *) buffer)->rec_len)))->inode |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2209 | |
| 2210 | /* |
| 2211 | * Anybody can rename anything with this: the permission checks are left to the |
| 2212 | * higher-level routines. |
| 2213 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2214 | static int ext4_rename (struct inode * old_dir, struct dentry *old_dentry, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2215 | struct inode * new_dir,struct dentry *new_dentry) |
| 2216 | { |
| 2217 | handle_t *handle; |
| 2218 | struct inode * old_inode, * new_inode; |
| 2219 | struct buffer_head * old_bh, * new_bh, * dir_bh; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2220 | struct ext4_dir_entry_2 * old_de, * new_de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2221 | int retval; |
| 2222 | |
| 2223 | old_bh = new_bh = dir_bh = NULL; |
| 2224 | |
| 2225 | /* Initialize quotas before so that eventual writes go |
| 2226 | * in separate transaction */ |
| 2227 | if (new_dentry->d_inode) |
| 2228 | DQUOT_INIT(new_dentry->d_inode); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2229 | handle = ext4_journal_start(old_dir, 2 * |
| 2230 | EXT4_DATA_TRANS_BLOCKS(old_dir->i_sb) + |
| 2231 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2232 | if (IS_ERR(handle)) |
| 2233 | return PTR_ERR(handle); |
| 2234 | |
| 2235 | if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) |
| 2236 | handle->h_sync = 1; |
| 2237 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2238 | old_bh = ext4_find_entry (old_dentry, &old_de); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2239 | /* |
| 2240 | * Check for inode number is _not_ due to possible IO errors. |
| 2241 | * We might rmdir the source, keep it as pwd of some process |
| 2242 | * and merrily kill the link to whatever was created under the |
| 2243 | * same name. Goodbye sticky bit ;-< |
| 2244 | */ |
| 2245 | old_inode = old_dentry->d_inode; |
| 2246 | retval = -ENOENT; |
| 2247 | if (!old_bh || le32_to_cpu(old_de->inode) != old_inode->i_ino) |
| 2248 | goto end_rename; |
| 2249 | |
| 2250 | new_inode = new_dentry->d_inode; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2251 | new_bh = ext4_find_entry (new_dentry, &new_de); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2252 | if (new_bh) { |
| 2253 | if (!new_inode) { |
| 2254 | brelse (new_bh); |
| 2255 | new_bh = NULL; |
| 2256 | } |
| 2257 | } |
| 2258 | if (S_ISDIR(old_inode->i_mode)) { |
| 2259 | if (new_inode) { |
| 2260 | retval = -ENOTEMPTY; |
| 2261 | if (!empty_dir (new_inode)) |
| 2262 | goto end_rename; |
| 2263 | } |
| 2264 | retval = -EIO; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2265 | dir_bh = ext4_bread (handle, old_inode, 0, 0, &retval); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2266 | if (!dir_bh) |
| 2267 | goto end_rename; |
| 2268 | if (le32_to_cpu(PARENT_INO(dir_bh->b_data)) != old_dir->i_ino) |
| 2269 | goto end_rename; |
| 2270 | retval = -EMLINK; |
| 2271 | if (!new_inode && new_dir!=old_dir && |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2272 | new_dir->i_nlink >= EXT4_LINK_MAX) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2273 | goto end_rename; |
| 2274 | } |
| 2275 | if (!new_bh) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2276 | retval = ext4_add_entry (handle, new_dentry, old_inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2277 | if (retval) |
| 2278 | goto end_rename; |
| 2279 | } else { |
| 2280 | BUFFER_TRACE(new_bh, "get write access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2281 | ext4_journal_get_write_access(handle, new_bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2282 | new_de->inode = cpu_to_le32(old_inode->i_ino); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2283 | if (EXT4_HAS_INCOMPAT_FEATURE(new_dir->i_sb, |
| 2284 | EXT4_FEATURE_INCOMPAT_FILETYPE)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2285 | new_de->file_type = old_de->file_type; |
| 2286 | new_dir->i_version++; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2287 | BUFFER_TRACE(new_bh, "call ext4_journal_dirty_metadata"); |
| 2288 | ext4_journal_dirty_metadata(handle, new_bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2289 | brelse(new_bh); |
| 2290 | new_bh = NULL; |
| 2291 | } |
| 2292 | |
| 2293 | /* |
| 2294 | * Like most other Unix systems, set the ctime for inodes on a |
| 2295 | * rename. |
| 2296 | */ |
| 2297 | old_inode->i_ctime = CURRENT_TIME_SEC; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2298 | ext4_mark_inode_dirty(handle, old_inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2299 | |
| 2300 | /* |
| 2301 | * ok, that's it |
| 2302 | */ |
| 2303 | if (le32_to_cpu(old_de->inode) != old_inode->i_ino || |
| 2304 | old_de->name_len != old_dentry->d_name.len || |
| 2305 | strncmp(old_de->name, old_dentry->d_name.name, old_de->name_len) || |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2306 | (retval = ext4_delete_entry(handle, old_dir, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2307 | old_de, old_bh)) == -ENOENT) { |
| 2308 | /* old_de could have moved from under us during htree split, so |
| 2309 | * make sure that we are deleting the right entry. We might |
| 2310 | * also be pointing to a stale entry in the unused part of |
| 2311 | * old_bh so just checking inum and the name isn't enough. */ |
| 2312 | struct buffer_head *old_bh2; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2313 | struct ext4_dir_entry_2 *old_de2; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2314 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2315 | old_bh2 = ext4_find_entry(old_dentry, &old_de2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2316 | if (old_bh2) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2317 | retval = ext4_delete_entry(handle, old_dir, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2318 | old_de2, old_bh2); |
| 2319 | brelse(old_bh2); |
| 2320 | } |
| 2321 | } |
| 2322 | if (retval) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2323 | ext4_warning(old_dir->i_sb, "ext4_rename", |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2324 | "Deleting old file (%lu), %d, error=%d", |
| 2325 | old_dir->i_ino, old_dir->i_nlink, retval); |
| 2326 | } |
| 2327 | |
| 2328 | if (new_inode) { |
| 2329 | drop_nlink(new_inode); |
| 2330 | new_inode->i_ctime = CURRENT_TIME_SEC; |
| 2331 | } |
| 2332 | old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2333 | ext4_update_dx_flag(old_dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2334 | if (dir_bh) { |
| 2335 | BUFFER_TRACE(dir_bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2336 | ext4_journal_get_write_access(handle, dir_bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2337 | PARENT_INO(dir_bh->b_data) = cpu_to_le32(new_dir->i_ino); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2338 | BUFFER_TRACE(dir_bh, "call ext4_journal_dirty_metadata"); |
| 2339 | ext4_journal_dirty_metadata(handle, dir_bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2340 | drop_nlink(old_dir); |
| 2341 | if (new_inode) { |
| 2342 | drop_nlink(new_inode); |
| 2343 | } else { |
| 2344 | inc_nlink(new_dir); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2345 | ext4_update_dx_flag(new_dir); |
| 2346 | ext4_mark_inode_dirty(handle, new_dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2347 | } |
| 2348 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2349 | ext4_mark_inode_dirty(handle, old_dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2350 | if (new_inode) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2351 | ext4_mark_inode_dirty(handle, new_inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2352 | if (!new_inode->i_nlink) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2353 | ext4_orphan_add(handle, new_inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2354 | } |
| 2355 | retval = 0; |
| 2356 | |
| 2357 | end_rename: |
| 2358 | brelse (dir_bh); |
| 2359 | brelse (old_bh); |
| 2360 | brelse (new_bh); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2361 | ext4_journal_stop(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2362 | return retval; |
| 2363 | } |
| 2364 | |
| 2365 | /* |
| 2366 | * directories can handle most operations... |
| 2367 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2368 | struct inode_operations ext4_dir_inode_operations = { |
| 2369 | .create = ext4_create, |
| 2370 | .lookup = ext4_lookup, |
| 2371 | .link = ext4_link, |
| 2372 | .unlink = ext4_unlink, |
| 2373 | .symlink = ext4_symlink, |
| 2374 | .mkdir = ext4_mkdir, |
| 2375 | .rmdir = ext4_rmdir, |
| 2376 | .mknod = ext4_mknod, |
| 2377 | .rename = ext4_rename, |
| 2378 | .setattr = ext4_setattr, |
| 2379 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2380 | .setxattr = generic_setxattr, |
| 2381 | .getxattr = generic_getxattr, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2382 | .listxattr = ext4_listxattr, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2383 | .removexattr = generic_removexattr, |
| 2384 | #endif |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2385 | .permission = ext4_permission, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2386 | }; |
| 2387 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2388 | struct inode_operations ext4_special_inode_operations = { |
| 2389 | .setattr = ext4_setattr, |
| 2390 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2391 | .setxattr = generic_setxattr, |
| 2392 | .getxattr = generic_getxattr, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2393 | .listxattr = ext4_listxattr, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2394 | .removexattr = generic_removexattr, |
| 2395 | #endif |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2396 | .permission = ext4_permission, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2397 | }; |