1 commit 2db3b2b33ee796f4ea61316773452d936303ad27
2 Author: Pravin Shelar <Pravin.Shelar@sun.com>
3 AuthorDate: Sun Oct 4 18:13:14 2009 +0000
4 Subject: ext4: add ext4-data-in-dirent patch
6 Allows ext4 to store extra data records inside the ext4_dirent
7 along with the regular directory entry (type, length, filename).
8 Data is stored in ext4 dirent after filename, with a bit flag in
9 de->file_type to indicate if any record after de->name is used.
10 Each in-use record is variable length and must store a 1-byte
11 length (including the length byte itself) at the start so that it
12 can be skipped if the record type is unknown/uneeded. The record
13 starts after a NUL byte terminator for the filename. This extra
14 space is accounted in de->rec_len but not de->name_len.
16 Flag EXT4_DIRENT_LUFID is used for a 128-bit file identifier.
17 Make use of dentry->d_fsdata to pass LUFID to ext4, so no changes
18 in ext4_add_entry() interface are required.
21 Signed-off-by: Pravin Shelar <Pravin.Shelar@sun.com>
22 Reviewed-by: Huang Hua <h.huang@sun.com>
23 Signed-off-by: Andreas Dilger <andreas.dilger@sun.com>
25 diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
26 index 9fdd2b2..2a73a69 100644
29 @@ -77,7 +77,7 @@ int __ext4_check_dir_entry(const char *function, unsigned int line,
30 error_msg = "rec_len is smaller than minimal";
31 else if (unlikely(rlen % 4 != 0))
32 error_msg = "rec_len % 4 != 0";
33 - else if (unlikely(rlen < EXT4_DIR_REC_LEN(de->name_len)))
34 + else if (unlikely(rlen < EXT4_DIR_ENTRY_LEN(de)))
35 error_msg = "rec_len is too small for name_len";
36 else if (unlikely(((char *) de - buf) + rlen > size))
37 error_msg = "directory entry overrun";
38 @@ -220,7 +220,7 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
39 * failure will be detected in the
40 * dirent test below. */
41 if (ext4_rec_len_from_disk(de->rec_len,
42 - sb->s_blocksize) < EXT4_DIR_REC_LEN(1))
43 + sb->s_blocksize) < EXT4_DIR_REC_LEN(1))
45 i += ext4_rec_len_from_disk(de->rec_len,
47 @@ -443,12 +443,17 @@ int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
48 struct fname *fname, *new_fn;
49 struct dir_private_info *info;
53 info = dir_file->private_data;
54 p = &info->root.rb_node;
56 /* Create and allocate the fname structure */
57 - len = sizeof(struct fname) + ent_name->len + 1;
58 + if (dirent->file_type & EXT4_DIRENT_LUFID)
59 + extra_data = ext4_get_dirent_data_len(dirent);
61 + len = sizeof(struct fname) + ent_name->len + extra_data + 1;
63 new_fn = kzalloc(len, GFP_KERNEL);
66 @@ -457,7 +462,7 @@ int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
67 new_fn->inode = le32_to_cpu(dirent->inode);
68 new_fn->name_len = ent_name->len;
69 new_fn->file_type = dirent->file_type;
70 - memcpy(new_fn->name, ent_name->name, ent_name->len);
71 + memcpy(new_fn->name, ent_name->name, ent_name->len + extra_data);
72 new_fn->name[ent_name->len] = 0;
75 diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
76 index cb649f0..fe35251 100644
79 @@ -1094,6 +1094,7 @@ struct ext4_inode_info {
88 * Mount flags set via mount options or defaults
90 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
91 +#define EXT4_MOUNT_DIRDATA 0x00002 /* Data in directory entries */
92 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
93 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
94 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
96 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
97 EXT4_FEATURE_INCOMPAT_EA_INODE| \
98 EXT4_FEATURE_INCOMPAT_MMP | \
99 + EXT4_FEATURE_INCOMPAT_DIRDATA| \
100 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
101 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
102 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
103 @@ -2020,6 +2023,43 @@ struct ext4_dir_entry_tail {
104 #define EXT4_FT_SYMLINK 7
106 #define EXT4_FT_MAX 8
107 +#define EXT4_FT_MASK 0xf
109 +#if EXT4_FT_MAX > EXT4_FT_MASK
110 +#error "conflicting EXT4_FT_MAX and EXT4_FT_MASK"
114 + * d_type has 4 unused bits, so it can hold four types data. these different
115 + * type of data (e.g. lustre data, high 32 bits of 64-bit inode number) can be
116 + * stored, in flag order, after file-name in ext4 dirent.
119 + * this flag is added to d_type if ext4 dirent has extra data after
120 + * filename. this data length is variable and length is stored in first byte
121 + * of data. data start after filename NUL byte.
122 + * This is used by Lustre FS.
124 +#define EXT4_DIRENT_LUFID 0x10
126 +#define EXT4_LUFID_MAGIC 0xAD200907UL
127 +struct ext4_dentry_param {
128 + __u32 edp_magic; /* EXT4_LUFID_MAGIC */
129 + char edp_len; /* size of edp_data in bytes */
130 + char edp_data[0]; /* packed array of data */
133 +static inline unsigned char *ext4_dentry_get_data(struct super_block *sb,
134 + struct ext4_dentry_param *p)
137 + if (!ext4_has_feature_dirdata(sb))
139 + if (p && p->edp_magic == EXT4_LUFID_MAGIC)
140 + return &p->edp_len;
145 #define EXT4_FT_DIR_CSUM 0xDE
147 @@ -2030,8 +2070,16 @@ struct ext4_dir_entry_tail {
149 #define EXT4_DIR_PAD 4
150 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
151 -#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
152 +#define EXT4_DIR_REC_LEN_(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
154 +#define EXT4_DIR_ENTRY_LEN_(de) (EXT4_DIR_REC_LEN_((de)->name_len +\
155 + ext4_get_dirent_data_len(de)))
157 +#define EXT4_DIR_REC_LEN(name_len) EXT4_DIR_REC_LEN_((name_len))
158 +#define EXT4_DIR_ENTRY_LEN(de) EXT4_DIR_ENTRY_LEN_((de))
159 +/* lustre osd_handler compat */
160 +#define __EXT4_DIR_REC_LEN(name_len) EXT4_DIR_REC_LEN_((name_len))
162 #define EXT4_MAX_REC_LEN ((1<<16)-1)
165 @@ -2491,11 +2539,11 @@ extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
166 struct buffer_head *bh,
167 void *buf, int buf_size,
168 struct ext4_filename *fname,
169 - struct ext4_dir_entry_2 **dest_de);
170 + struct ext4_dir_entry_2 **dest_de, int dlen);
171 void ext4_insert_dentry(struct inode *inode,
172 struct ext4_dir_entry_2 *de,
174 - struct ext4_filename *fname);
175 + struct ext4_filename *fname, void *data);
176 static inline void ext4_update_dx_flag(struct inode *inode)
178 if (!ext4_has_feature_dir_index(inode->i_sb))
179 @@ -2507,10 +2555,17 @@ static const unsigned char ext4_filetype_table[] = {
181 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
183 - if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
184 + int fl_index = filetype & EXT4_FT_MASK;
186 + if (!ext4_has_feature_filetype(sb) || fl_index >= EXT4_FT_MAX)
189 - return ext4_filetype_table[filetype];
190 + if (!test_opt(sb, DIRDATA))
191 + return ext4_filetype_table[fl_index];
193 + return (ext4_filetype_table[fl_index]) |
194 + (filetype & EXT4_DIRENT_LUFID);
197 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
198 void *buf, int buf_size);
199 @@ -2673,6 +2728,8 @@ extern struct inode *ext4_create_inode(handle_t *handle,
200 extern int ext4_delete_entry(handle_t *handle, struct inode * dir,
201 struct ext4_dir_entry_2 *de_del,
202 struct buffer_head *bh);
203 +extern int ext4_add_dot_dotdot(handle_t *handle, struct inode *dir,
204 + struct inode *inode, const void *, const void *);
205 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
206 __u32 start_minor_hash, __u32 *next_hash);
207 extern int ext4_search_dir(struct buffer_head *bh,
208 @@ -3428,6 +3485,36 @@ static inline int ext4_buffer_uptodate(struct buffer_head *bh)
209 return buffer_uptodate(bh);
213 + * Compute the total directory entry data length.
214 + * This includes the filename and an implicit NUL terminator (always present),
215 + * and optional extensions. Each extension has a bit set in the high 4 bits of
216 + * de->file_type, and the extension length is the first byte in each entry.
218 +static inline int ext4_get_dirent_data_len(struct ext4_dir_entry_2 *de)
220 + char *len = de->name + de->name_len + 1 /* NUL terminator */;
222 + __u8 extra_data_flags = (de->file_type & ~EXT4_FT_MASK) >> 4;
223 + struct ext4_dir_entry_tail *t = (struct ext4_dir_entry_tail *)de;
225 + if (!t->det_reserved_zero1 &&
226 + le16_to_cpu(t->det_rec_len) ==
227 + sizeof(struct ext4_dir_entry_tail) &&
228 + !t->det_reserved_zero2 &&
229 + t->det_reserved_ft == EXT4_FT_DIR_CSUM)
232 + while (extra_data_flags) {
233 + if (extra_data_flags & 1) {
234 + dlen += *len + (dlen == 0);
237 + extra_data_flags >>= 1;
242 #endif /* __KERNEL__ */
244 #define EFSBADCRC EBADMSG /* Bad CRC detected */
245 diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
246 index 2fec62d..3f35821 100644
247 --- a/fs/ext4/inline.c
248 +++ b/fs/ext4/inline.c
249 @@ -1023,7 +1023,7 @@ static int ext4_add_dirent_to_inline(handle_t *handle,
250 struct ext4_dir_entry_2 *de;
252 err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
253 - inline_size, fname, &de);
254 + inline_size, fname, &de, 0);
258 @@ -1031,7 +1031,7 @@ static int ext4_add_dirent_to_inline(handle_t *handle,
259 err = ext4_journal_get_write_access(handle, iloc->bh);
262 - ext4_insert_dentry(inode, de, inline_size, fname);
263 + ext4_insert_dentry(inode, de, inline_size, fname, NULL);
265 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
267 @@ -1378,7 +1378,7 @@ int ext4_inlinedir_to_tree(struct file *dir_file,
269 strcpy(fake.name, ".");
270 fake.rec_len = ext4_rec_len_to_disk(
271 - EXT4_DIR_REC_LEN(fake.name_len),
272 + EXT4_DIR_ENTRY_LEN(&fake),
274 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
276 @@ -1388,7 +1388,7 @@ int ext4_inlinedir_to_tree(struct file *dir_file,
278 strcpy(fake.name, "..");
279 fake.rec_len = ext4_rec_len_to_disk(
280 - EXT4_DIR_REC_LEN(fake.name_len),
281 + EXT4_DIR_ENTRY_LEN(&fake),
283 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
285 diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
286 index 8713671..23bd871 100644
287 --- a/fs/ext4/namei.c
288 +++ b/fs/ext4/namei.c
289 @@ -258,7 +258,8 @@ static unsigned dx_get_count(struct dx_entry *entries);
290 static unsigned dx_get_limit(struct dx_entry *entries);
291 static void dx_set_count(struct dx_entry *entries, unsigned value);
292 static void dx_set_limit(struct dx_entry *entries, unsigned value);
293 -static unsigned dx_root_limit(struct inode *dir, unsigned infosize);
294 +static inline unsigned dx_root_limit(struct inode *dir,
295 + struct ext4_dir_entry_2 *dot_de, unsigned infosize);
296 static unsigned dx_node_limit(struct inode *dir);
297 static struct dx_frame *dx_probe(struct ext4_filename *fname,
299 @@ -402,22 +403,23 @@ static struct dx_countlimit *get_dx_countlimit(struct inode *inode,
301 struct ext4_dir_entry *dp;
302 struct dx_root_info *root;
304 + int count_offset, dot_rec_len, dotdot_rec_len;
306 if (le16_to_cpu(dirent->rec_len) == EXT4_BLOCK_SIZE(inode->i_sb))
308 - else if (le16_to_cpu(dirent->rec_len) == 12) {
309 - dp = (struct ext4_dir_entry *)(((void *)dirent) + 12);
311 + dot_rec_len = le16_to_cpu(dirent->rec_len);
312 + dp = (struct ext4_dir_entry *)(((void *)dirent) + dot_rec_len);
313 if (le16_to_cpu(dp->rec_len) !=
314 - EXT4_BLOCK_SIZE(inode->i_sb) - 12)
315 + EXT4_BLOCK_SIZE(inode->i_sb) - dot_rec_len)
317 - root = (struct dx_root_info *)(((void *)dp + 12));
318 + dotdot_rec_len = EXT4_DIR_ENTRY_LEN((struct ext4_dir_entry_2 *)dp);
319 + root = (struct dx_root_info *)(((void *)dp + dotdot_rec_len));
320 if (root->reserved_zero ||
321 root->info_length != sizeof(struct dx_root_info))
326 + count_offset = 8 + dot_rec_len + dotdot_rec_len;
330 *offset = count_offset;
331 @@ -522,11 +524,12 @@ ext4_next_entry(struct ext4_dir_entry_2 *p, unsigned long blocksize)
333 struct dx_root_info *dx_get_dx_info(struct ext4_dir_entry_2 *de)
335 + BUG_ON(de->name_len != 1);
336 /* get dotdot first */
337 - de = (struct ext4_dir_entry_2 *)((char *)de + EXT4_DIR_REC_LEN(1));
338 + de = (struct ext4_dir_entry_2 *)((char *)de + EXT4_DIR_ENTRY_LEN(de));
340 /* dx root info is after dotdot entry */
341 - de = (struct ext4_dir_entry_2 *)((char *)de + EXT4_DIR_REC_LEN(2));
342 + de = (struct ext4_dir_entry_2 *)((char *)de + EXT4_DIR_ENTRY_LEN(de));
344 return (struct dx_root_info *)de;
346 @@ -571,10 +574,16 @@ static inline void dx_set_limit(struct dx_entry *entries, unsigned value)
347 ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value);
350 -static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize)
351 +static inline unsigned dx_root_limit(struct inode *dir,
352 + struct ext4_dir_entry_2 *dot_de, unsigned infosize)
354 - unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) -
355 - EXT4_DIR_REC_LEN(2) - infosize;
356 + struct ext4_dir_entry_2 *dotdot_de;
357 + unsigned entry_space;
359 + BUG_ON(dot_de->name_len != 1);
360 + dotdot_de = ext4_next_entry(dot_de, dir->i_sb->s_blocksize);
361 + entry_space = dir->i_sb->s_blocksize - EXT4_DIR_ENTRY_LEN(dot_de) -
362 + EXT4_DIR_ENTRY_LEN(dotdot_de) - infosize;
364 if (ext4_has_metadata_csum(dir->i_sb))
365 entry_space -= sizeof(struct dx_tail);
366 @@ -695,7 +704,7 @@ static struct stats dx_show_leaf(struct inode *dir,
367 (unsigned) ((char *) de - base));
370 - space += EXT4_DIR_REC_LEN(de->name_len);
371 + space += EXT4_DIR_ENTRY_LEN(de);
374 de = ext4_next_entry(de, size);
375 @@ -802,11 +811,14 @@ dx_probe(struct ext4_filename *fname, struct inode *dir,
377 entries = (struct dx_entry *)(((char *)info) + info->info_length);
379 - if (dx_get_limit(entries) != dx_root_limit(dir,
380 - info->info_length)) {
381 + if (dx_get_limit(entries) !=
382 + dx_root_limit(dir, (struct ext4_dir_entry_2 *)frame->bh->b_data,
383 + info->info_length)) {
384 ext4_warning_inode(dir, "dx entry: limit %u != root limit %u",
385 dx_get_limit(entries),
386 - dx_root_limit(dir, info->info_length));
388 + (struct ext4_dir_entry_2 *)frame->bh->b_data,
389 + info->info_length));
393 @@ -1792,7 +1804,7 @@ dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count,
395 struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *)
396 (from + (map->offs<<2));
397 - rec_len = EXT4_DIR_REC_LEN(de->name_len);
398 + rec_len = EXT4_DIR_ENTRY_LEN(de);
399 memcpy (to, de, rec_len);
400 ((struct ext4_dir_entry_2 *) to)->rec_len =
401 ext4_rec_len_to_disk(rec_len, blocksize);
402 @@ -1816,7 +1828,7 @@ static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize)
403 while ((char*)de < base + blocksize) {
404 next = ext4_next_entry(de, blocksize);
405 if (de->inode && de->name_len) {
406 - rec_len = EXT4_DIR_REC_LEN(de->name_len);
407 + rec_len = EXT4_DIR_ENTRY_LEN(de);
409 memmove(to, de, rec_len);
410 to->rec_len = ext4_rec_len_to_disk(rec_len, blocksize);
411 @@ -1943,10 +1955,10 @@ int ext4_find_dest_de(struct inode *dir, struct inode *inode,
412 struct buffer_head *bh,
413 void *buf, int buf_size,
414 struct ext4_filename *fname,
415 - struct ext4_dir_entry_2 **dest_de)
416 + struct ext4_dir_entry_2 **dest_de, int dlen)
418 struct ext4_dir_entry_2 *de;
419 - unsigned short reclen = EXT4_DIR_REC_LEN(fname_len(fname));
420 + unsigned short reclen = EXT4_DIR_REC_LEN(fname_len(fname) + dlen);
422 unsigned int offset = 0;
424 @@ -1959,7 +1973,7 @@ int ext4_find_dest_de(struct inode *dir, struct inode *inode,
425 return -EFSCORRUPTED;
426 if (ext4_match(dir, fname, de))
428 - nlen = EXT4_DIR_REC_LEN(de->name_len);
429 + nlen = EXT4_DIR_ENTRY_LEN(de);
430 rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
431 if ((de->inode ? rlen - nlen : rlen) >= reclen)
433 @@ -1976,12 +2006,12 @@ int ext4_find_dest_de(struct inode *dir, struct inode *inode,
434 void ext4_insert_dentry(struct inode *inode,
435 struct ext4_dir_entry_2 *de,
437 - struct ext4_filename *fname)
438 + struct ext4_filename *fname, void *data)
443 - nlen = EXT4_DIR_REC_LEN(de->name_len);
444 + nlen = EXT4_DIR_ENTRY_LEN(de);
445 rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
447 struct ext4_dir_entry_2 *de1 =
448 @@ -1995,6 +2025,11 @@ void ext4_insert_dentry(struct inode *inode,
449 ext4_set_de_type(inode->i_sb, de, inode->i_mode);
450 de->name_len = fname_len(fname);
451 memcpy(de->name, fname_name(fname), fname_len(fname));
453 + de->name[fname_len(fname)] = 0;
454 + memcpy(&de->name[fname_len(fname) + 1], data, *(char *)data);
455 + de->file_type |= EXT4_DIRENT_LUFID;
460 @@ -2012,14 +2047,19 @@ static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname,
462 unsigned int blocksize = dir->i_sb->s_blocksize;
466 + unsigned char *data;
468 + data = ext4_dentry_get_data(inode->i_sb, (struct ext4_dentry_param *)
469 + EXT4_I(inode)->i_dirdata);
470 if (ext4_has_metadata_csum(inode->i_sb))
471 csum_size = sizeof(struct ext4_dir_entry_tail);
475 + dlen = (*data) + 1;
476 err = ext4_find_dest_de(dir, inode, bh, bh->b_data,
477 - blocksize - csum_size, fname, &de);
478 + blocksize - csum_size, fname, &de, dlen);
482 @@ -2031,7 +2071,7 @@ static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname,
485 /* By now the buffer is marked for journaling */
486 - ext4_insert_dentry(inode, de, blocksize, fname);
487 + ext4_insert_dentry(inode, de, blocksize, fname, data);
490 * XXX shouldn't update any times until successful
491 @@ -2136,7 +2179,8 @@ static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname,
493 dx_set_block(entries, 1);
494 dx_set_count(entries, 1);
495 - dx_set_limit(entries, dx_root_limit(dir, sizeof(*dx_info)));
496 + dx_set_limit(entries, dx_root_limit(dir,
497 + dot_de, sizeof(*dx_info)));
499 /* Initialize as for dx_probe */
500 fname->hinfo.hash_version = dx_info->hash_version;
501 @@ -2068,7 +2091,104 @@ out_frames:
505 -/* update ".." entry */
506 +static int ext4_expand_dotdot(struct inode *dir,
507 + struct buffer_head *bh,
510 + struct ext4_dir_entry_2 *dot_de;
511 + struct ext4_dir_entry_2 *dotdot_de;
513 + unsigned blocksize = dir->i_sb->s_blocksize;
515 + dot_de = (struct ext4_dir_entry_2 *)bh->b_data;
516 + dotdot_de = ext4_next_entry(dot_de, blocksize);
519 + struct dx_entry *entries;
520 + struct dx_root_info *dx_info;
524 + len = EXT4_DIR_REC_LEN(2 + dlen) -
525 + EXT4_DIR_ENTRY_LEN(dotdot_de);
527 + dx_info = dx_get_dx_info(dot_de);
528 + entries = (struct dx_entry *)((char *)dx_info +
530 + count = dx_get_count(entries);
533 + * figure out new limit with dlen,
534 + * check if we have enough space
536 + entry_space = blocksize;
537 + entry_space -= (char *)dotdot_de - (char *)dot_de +
538 + EXT4_DIR_REC_LEN(2 + dlen) + sizeof(*dx_info);
539 + if (ext4_has_metadata_csum(dir->i_sb))
540 + entry_space -= sizeof(struct dx_tail);
541 + limit = entry_space / sizeof(struct dx_entry);
545 + /* set the new limit, move dx_info and the entries */
546 + dx_set_limit(entries, limit);
547 + memmove((char *)dx_info + len, dx_info,
548 + sizeof(*dx_info) + count * sizeof(struct dx_entry));
550 + struct ext4_dir_entry_2 *next, *to, *prev, *de;
551 + char *top = (char *)bh->b_data + blocksize;
553 + unsigned rec_len = 0;
555 + len = EXT4_DIR_REC_LEN(2 + dlen) -
556 + ext4_rec_len_from_disk(dotdot_de->rec_len, blocksize);
558 + if (ext4_has_metadata_csum(dir->i_sb))
559 + top -= sizeof(struct ext4_dir_entry_tail);
561 + de = ext4_next_entry(dotdot_de, blocksize);
562 + while ((char *)de < top) {
563 + space += ext4_rec_len_from_disk(de->rec_len, blocksize) -
564 + EXT4_DIR_ENTRY_LEN(de);
565 + de = ext4_next_entry(de, blocksize);
571 + /* pack all the entries after dotdot */
572 + de = ext4_next_entry(dotdot_de, blocksize);
574 + while ((char *)de < top) {
575 + next = ext4_next_entry(de, blocksize);
576 + if (de->inode && de->name_len) {
577 + rec_len = EXT4_DIR_ENTRY_LEN(de);
579 + memmove(to, de, rec_len);
580 + to->rec_len = ext4_rec_len_to_disk(rec_len,
583 + to = (struct ext4_dir_entry_2 *)
584 + (((char *)to) + rec_len);
588 + /* fix up rec_len for the last entry */
589 + prev->rec_len = ext4_rec_len_to_disk(top - (char *)prev - len,
591 + /* move all the entries after dotdot to make space */
592 + de = ext4_next_entry(dotdot_de, blocksize);
593 + memmove((char *)de + len, de, (char *)prev - (char *)de +
594 + EXT4_DIR_ENTRY_LEN(prev));
595 + /* fix the rec_len for dotdot */
596 + dotdot_de->rec_len = ext4_rec_len_to_disk(
597 + EXT4_DIR_REC_LEN(2 + dlen), blocksize);
603 +/* update ".." entry, try to expand the entry if necessary */
604 static int ext4_update_dotdot(handle_t *handle, struct dentry *dentry,
607 @@ -2077,6 +2203,8 @@ static int ext4_update_dotdot(handle_t *
608 struct ext4_dir_entry_2 *dot_de, *dotdot_de;
615 return PTR_ERR(handle);
616 @@ -2116,6 +2244,30 @@ static int ext4_update_dotdot(handle_t *
618 dotdot_de->inode = cpu_to_le32(inode->i_ino);
620 + data = ext4_dentry_get_data(dir->i_sb,
621 + (struct ext4_dentry_param *)dentry->d_fsdata);
622 + if (data != NULL) {
625 + if (ext4_get_dirent_data_len(dotdot_de) < dlen) {
626 + if (ext4_expand_dotdot(dir, bh, dlen) < 0)
630 + if (ext4_rec_len_from_disk(dotdot_de->rec_len,
631 + dir->i_sb->s_blocksize) <
632 + EXT4_DIR_REC_LEN(2 + dlen)) {
633 + if (ext4_expand_dotdot(dir, bh, dlen) < 0)
639 + dotdot_de->name[2] = 0;
640 + memcpy(&dotdot_de->name[2 + 1], data, *data);
641 + dotdot_de->file_type |= LDISKFS_DIRENT_LUFID;
644 ext4_mark_inode_dirty(handle, dir);
645 BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata");
647 @@ -2271,6 +2327,7 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
648 ext4_lblk_t block, blocks;
651 + EXT4_I(inode)->i_dirdata = dentry->d_fsdata;
652 if (ext4_has_metadata_csum(inode->i_sb))
653 csum_size = sizeof(struct ext4_dir_entry_tail);
655 @@ -2803,37 +2860,70 @@ err_unlock_inode:
660 + struct inode *inode;
665 struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
666 struct ext4_dir_entry_2 *de,
667 int blocksize, int csum_size,
668 unsigned int parent_ino, int dotdot_real_len)
670 + void *data1 = NULL, *data2 = NULL;
671 + int dot_reclen = 0;
673 + if (dotdot_real_len == 10) {
674 + struct tp_block *tpb = (struct tp_block *)inode;
675 + data1 = tpb->data1;
676 + data2 = tpb->data2;
677 + inode = tpb->inode;
678 + dotdot_real_len = 0;
680 de->inode = cpu_to_le32(inode->i_ino);
682 - de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len),
684 strcpy(de->name, ".");
685 ext4_set_de_type(inode->i_sb, de, S_IFDIR);
687 + /* get packed fid data*/
688 + data1 = ext4_dentry_get_data(inode->i_sb,
689 + (struct ext4_dentry_param *) data1);
692 + memcpy(&de->name[2], data1, *(char *) data1);
693 + de->file_type |= EXT4_DIRENT_LUFID;
695 + de->rec_len = cpu_to_le16(EXT4_DIR_ENTRY_LEN(de));
696 + dot_reclen = cpu_to_le16(de->rec_len);
697 de = ext4_next_entry(de, blocksize);
698 de->inode = cpu_to_le32(parent_ino);
700 + strcpy(de->name, "..");
701 + ext4_set_de_type(inode->i_sb, de, S_IFDIR);
702 + data2 = ext4_dentry_get_data(inode->i_sb,
703 + (struct ext4_dentry_param *) data2);
706 + memcpy(&de->name[3], data2, *(char *) data2);
707 + de->file_type |= EXT4_DIRENT_LUFID;
709 if (!dotdot_real_len)
710 de->rec_len = ext4_rec_len_to_disk(blocksize -
711 - (csum_size + EXT4_DIR_REC_LEN(1)),
712 + (csum_size + dot_reclen),
715 de->rec_len = ext4_rec_len_to_disk(
716 - EXT4_DIR_REC_LEN(de->name_len), blocksize);
717 - strcpy(de->name, "..");
718 - ext4_set_de_type(inode->i_sb, de, S_IFDIR);
719 + EXT4_DIR_ENTRY_LEN(de), blocksize);
721 return ext4_next_entry(de, blocksize);
724 static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
725 - struct inode *inode)
726 + struct inode *inode,
727 + const void *data1, const void *data2)
729 + struct tp_block param;
730 struct buffer_head *dir_block = NULL;
731 struct ext4_dir_entry_2 *de;
732 ext4_lblk_t block = 0;
733 @@ -2857,7 +2947,11 @@ static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
734 if (IS_ERR(dir_block))
735 return PTR_ERR(dir_block);
736 de = (struct ext4_dir_entry_2 *)dir_block->b_data;
737 - ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0);
738 + param.inode = inode;
739 + param.data1 = (void *)data1;
740 + param.data2 = (void *)data2;
741 + ext4_init_dot_dotdot((struct inode *)(¶m), de, blocksize,
742 + csum_size, dir->i_ino, 10);
745 ext4_initialize_dirent_tail(dir_block, blocksize);
746 @@ -2872,6 +2966,29 @@ out:
750 +/* Initialize @inode as a subdirectory of @dir, and add the
751 + * "." and ".." entries into the first directory block. */
752 +int ext4_add_dot_dotdot(handle_t *handle, struct inode *dir,
753 + struct inode *inode,
754 + const void *data1, const void *data2)
758 + if (IS_ERR(handle))
759 + return PTR_ERR(handle);
761 + if (IS_DIRSYNC(dir))
762 + ext4_handle_sync(handle);
764 + inode->i_op = &ext4_dir_inode_operations;
765 + inode->i_fop = &ext4_dir_operations;
766 + rc = ext4_init_new_dir(handle, dir, inode, data1, data2);
768 + rc = ext4_mark_inode_dirty(handle, inode);
771 +EXPORT_SYMBOL(ext4_add_dot_dotdot);
773 static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
776 @@ -2898,7 +3015,7 @@ retry:
778 inode->i_op = &ext4_dir_inode_operations;
779 inode->i_fop = &ext4_dir_operations;
780 - err = ext4_init_new_dir(handle, dir, inode);
781 + err = ext4_init_new_dir(handle, dir, inode, NULL, NULL);
783 goto out_clear_inode;
784 err = ext4_mark_inode_dirty(handle, inode);
785 diff --git a/fs/ext4/super.c b/fs/ext4/super.c
786 index d202d6d..0fcc33b 100644
787 --- a/fs/ext4/super.c
788 +++ b/fs/ext4/super.c
789 @@ -1510,7 +1510,7 @@ enum {
790 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
791 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
792 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
793 - Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
794 + Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, Opt_dirdata,
795 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version,
796 Opt_dax, Opt_dax_always, Opt_dax_inode, Opt_dax_never,
797 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
798 @@ -1590,6 +1590,7 @@ static const match_table_t tokens = {
799 {Opt_nolazytime, "nolazytime"},
800 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
801 {Opt_nodelalloc, "nodelalloc"},
802 + {Opt_dirdata, "dirdata"},
803 {Opt_removed, "mblk_io_submit"},
804 {Opt_removed, "nomblk_io_submit"},
805 {Opt_block_validity, "block_validity"},
806 @@ -1820,6 +1821,7 @@ static const struct mount_opts {
807 {Opt_usrjquota, 0, MOPT_Q},
808 {Opt_grpjquota, 0, MOPT_Q},
809 {Opt_offusrjquota, 0, MOPT_Q},
810 + {Opt_dirdata, EXT4_MOUNT_DIRDATA, MOPT_SET},
811 {Opt_offgrpjquota, 0, MOPT_Q},
812 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
813 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},