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Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
4 | * |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
10 | /* | |
61e085a8 SW |
11 | * Implements Extendible Hashing as described in: |
12 | * "Extendible Hashing" by Fagin, et al in | |
13 | * __ACM Trans. on Database Systems__, Sept 1979. | |
14 | * | |
15 | * | |
16 | * Here's the layout of dirents which is essentially the same as that of ext2 | |
17 | * within a single block. The field de_name_len is the number of bytes | |
18 | * actually required for the name (no null terminator). The field de_rec_len | |
19 | * is the number of bytes allocated to the dirent. The offset of the next | |
20 | * dirent in the block is (dirent + dirent->de_rec_len). When a dirent is | |
21 | * deleted, the preceding dirent inherits its allocated space, ie | |
22 | * prev->de_rec_len += deleted->de_rec_len. Since the next dirent is obtained | |
23 | * by adding de_rec_len to the current dirent, this essentially causes the | |
24 | * deleted dirent to get jumped over when iterating through all the dirents. | |
25 | * | |
26 | * When deleting the first dirent in a block, there is no previous dirent so | |
27 | * the field de_ino is set to zero to designate it as deleted. When allocating | |
28 | * a dirent, gfs2_dirent_alloc iterates through the dirents in a block. If the | |
29 | * first dirent has (de_ino == 0) and de_rec_len is large enough, this first | |
30 | * dirent is allocated. Otherwise it must go through all the 'used' dirents | |
31 | * searching for one in which the amount of total space minus the amount of | |
32 | * used space will provide enough space for the new dirent. | |
33 | * | |
34 | * There are two types of blocks in which dirents reside. In a stuffed dinode, | |
35 | * the dirents begin at offset sizeof(struct gfs2_dinode) from the beginning of | |
36 | * the block. In leaves, they begin at offset sizeof(struct gfs2_leaf) from the | |
37 | * beginning of the leaf block. The dirents reside in leaves when | |
38 | * | |
383f01fb | 39 | * dip->i_diskflags & GFS2_DIF_EXHASH is true |
61e085a8 SW |
40 | * |
41 | * Otherwise, the dirents are "linear", within a single stuffed dinode block. | |
42 | * | |
43 | * When the dirents are in leaves, the actual contents of the directory file are | |
44 | * used as an array of 64-bit block pointers pointing to the leaf blocks. The | |
45 | * dirents are NOT in the directory file itself. There can be more than one | |
46 | * block pointer in the array that points to the same leaf. In fact, when a | |
47 | * directory is first converted from linear to exhash, all of the pointers | |
48 | * point to the same leaf. | |
49 | * | |
50 | * When a leaf is completely full, the size of the hash table can be | |
51 | * doubled unless it is already at the maximum size which is hard coded into | |
52 | * GFS2_DIR_MAX_DEPTH. After that, leaves are chained together in a linked list, | |
53 | * but never before the maximum hash table size has been reached. | |
54 | */ | |
b3b94faa | 55 | |
d77d1b58 JP |
56 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
57 | ||
b3b94faa DT |
58 | #include <linux/slab.h> |
59 | #include <linux/spinlock.h> | |
b3b94faa DT |
60 | #include <linux/buffer_head.h> |
61 | #include <linux/sort.h> | |
5c676f6d | 62 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 63 | #include <linux/crc32.h> |
fe1bdedc | 64 | #include <linux/vmalloc.h> |
b3b94faa DT |
65 | |
66 | #include "gfs2.h" | |
5c676f6d | 67 | #include "incore.h" |
b3b94faa DT |
68 | #include "dir.h" |
69 | #include "glock.h" | |
70 | #include "inode.h" | |
b3b94faa DT |
71 | #include "meta_io.h" |
72 | #include "quota.h" | |
73 | #include "rgrp.h" | |
74 | #include "trans.h" | |
e13940ba | 75 | #include "bmap.h" |
5c676f6d | 76 | #include "util.h" |
b3b94faa DT |
77 | |
78 | #define IS_LEAF 1 /* Hashed (leaf) directory */ | |
79 | #define IS_DINODE 2 /* Linear (stuffed dinode block) directory */ | |
80 | ||
dfe4d34b BP |
81 | #define MAX_RA_BLOCKS 32 /* max read-ahead blocks */ |
82 | ||
cd915493 SW |
83 | #define gfs2_disk_hash2offset(h) (((u64)(h)) >> 1) |
84 | #define gfs2_dir_offset2hash(p) ((u32)(((u64)(p)) << 1)) | |
471f3db2 BM |
85 | #define GFS2_HASH_INDEX_MASK 0xffffc000 |
86 | #define GFS2_USE_HASH_FLAG 0x2000 | |
b3b94faa | 87 | |
8d123585 SW |
88 | struct qstr gfs2_qdot __read_mostly; |
89 | struct qstr gfs2_qdotdot __read_mostly; | |
90 | ||
2bdbc5d7 SW |
91 | typedef int (*gfs2_dscan_t)(const struct gfs2_dirent *dent, |
92 | const struct qstr *name, void *opaque); | |
b3b94faa | 93 | |
cd915493 | 94 | int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block, |
61e085a8 | 95 | struct buffer_head **bhp) |
e13940ba SW |
96 | { |
97 | struct buffer_head *bh; | |
e13940ba | 98 | |
61e085a8 | 99 | bh = gfs2_meta_new(ip->i_gl, block); |
350a9b0a | 100 | gfs2_trans_add_meta(ip->i_gl, bh); |
61e085a8 SW |
101 | gfs2_metatype_set(bh, GFS2_METATYPE_JD, GFS2_FORMAT_JD); |
102 | gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); | |
e13940ba SW |
103 | *bhp = bh; |
104 | return 0; | |
105 | } | |
106 | ||
cd915493 | 107 | static int gfs2_dir_get_existing_buffer(struct gfs2_inode *ip, u64 block, |
61e085a8 SW |
108 | struct buffer_head **bhp) |
109 | { | |
110 | struct buffer_head *bh; | |
111 | int error; | |
e13940ba | 112 | |
c8d57703 | 113 | error = gfs2_meta_read(ip->i_gl, block, DIO_WAIT, 0, &bh); |
61e085a8 SW |
114 | if (error) |
115 | return error; | |
feaa7bba | 116 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_JD)) { |
61e085a8 SW |
117 | brelse(bh); |
118 | return -EIO; | |
119 | } | |
120 | *bhp = bh; | |
121 | return 0; | |
122 | } | |
e13940ba SW |
123 | |
124 | static int gfs2_dir_write_stuffed(struct gfs2_inode *ip, const char *buf, | |
125 | unsigned int offset, unsigned int size) | |
e13940ba SW |
126 | { |
127 | struct buffer_head *dibh; | |
128 | int error; | |
129 | ||
130 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
131 | if (error) | |
132 | return error; | |
133 | ||
350a9b0a | 134 | gfs2_trans_add_meta(ip->i_gl, dibh); |
c752666c | 135 | memcpy(dibh->b_data + offset + sizeof(struct gfs2_dinode), buf, size); |
a2e0f799 SW |
136 | if (ip->i_inode.i_size < offset + size) |
137 | i_size_write(&ip->i_inode, offset + size); | |
4bd91ba1 | 138 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
539e5d6b | 139 | gfs2_dinode_out(ip, dibh->b_data); |
e13940ba SW |
140 | |
141 | brelse(dibh); | |
142 | ||
143 | return size; | |
144 | } | |
145 | ||
146 | ||
147 | ||
148 | /** | |
149 | * gfs2_dir_write_data - Write directory information to the inode | |
150 | * @ip: The GFS2 inode | |
151 | * @buf: The buffer containing information to be written | |
152 | * @offset: The file offset to start writing at | |
153 | * @size: The amount of data to write | |
154 | * | |
155 | * Returns: The number of bytes correctly written or error code | |
156 | */ | |
157 | static int gfs2_dir_write_data(struct gfs2_inode *ip, const char *buf, | |
cd915493 | 158 | u64 offset, unsigned int size) |
e13940ba | 159 | { |
feaa7bba | 160 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
e13940ba | 161 | struct buffer_head *dibh; |
cd915493 SW |
162 | u64 lblock, dblock; |
163 | u32 extlen = 0; | |
e13940ba SW |
164 | unsigned int o; |
165 | int copied = 0; | |
166 | int error = 0; | |
9b8c81d1 | 167 | int new = 0; |
e13940ba SW |
168 | |
169 | if (!size) | |
170 | return 0; | |
171 | ||
172 | if (gfs2_is_stuffed(ip) && | |
173 | offset + size <= sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) | |
568f4c96 SW |
174 | return gfs2_dir_write_stuffed(ip, buf, (unsigned int)offset, |
175 | size); | |
e13940ba SW |
176 | |
177 | if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip))) | |
178 | return -EINVAL; | |
179 | ||
180 | if (gfs2_is_stuffed(ip)) { | |
f25ef0c1 | 181 | error = gfs2_unstuff_dinode(ip, NULL); |
e13940ba | 182 | if (error) |
c752666c | 183 | return error; |
e13940ba SW |
184 | } |
185 | ||
186 | lblock = offset; | |
187 | o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header); | |
188 | ||
189 | while (copied < size) { | |
190 | unsigned int amount; | |
191 | struct buffer_head *bh; | |
e13940ba SW |
192 | |
193 | amount = size - copied; | |
194 | if (amount > sdp->sd_sb.sb_bsize - o) | |
195 | amount = sdp->sd_sb.sb_bsize - o; | |
196 | ||
197 | if (!extlen) { | |
198 | new = 1; | |
feaa7bba | 199 | error = gfs2_extent_map(&ip->i_inode, lblock, &new, |
fd88de56 | 200 | &dblock, &extlen); |
e13940ba SW |
201 | if (error) |
202 | goto fail; | |
203 | error = -EIO; | |
204 | if (gfs2_assert_withdraw(sdp, dblock)) | |
205 | goto fail; | |
206 | } | |
207 | ||
61e085a8 SW |
208 | if (amount == sdp->sd_jbsize || new) |
209 | error = gfs2_dir_get_new_buffer(ip, dblock, &bh); | |
210 | else | |
211 | error = gfs2_dir_get_existing_buffer(ip, dblock, &bh); | |
212 | ||
e13940ba SW |
213 | if (error) |
214 | goto fail; | |
215 | ||
350a9b0a | 216 | gfs2_trans_add_meta(ip->i_gl, bh); |
e13940ba SW |
217 | memcpy(bh->b_data + o, buf, amount); |
218 | brelse(bh); | |
e13940ba | 219 | |
899bb264 | 220 | buf += amount; |
e13940ba SW |
221 | copied += amount; |
222 | lblock++; | |
223 | dblock++; | |
224 | extlen--; | |
225 | ||
226 | o = sizeof(struct gfs2_meta_header); | |
227 | } | |
228 | ||
229 | out: | |
230 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
231 | if (error) | |
232 | return error; | |
233 | ||
a2e0f799 SW |
234 | if (ip->i_inode.i_size < offset + copied) |
235 | i_size_write(&ip->i_inode, offset + copied); | |
4bd91ba1 | 236 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
e13940ba | 237 | |
350a9b0a | 238 | gfs2_trans_add_meta(ip->i_gl, dibh); |
539e5d6b | 239 | gfs2_dinode_out(ip, dibh->b_data); |
e13940ba SW |
240 | brelse(dibh); |
241 | ||
242 | return copied; | |
243 | fail: | |
244 | if (copied) | |
245 | goto out; | |
246 | return error; | |
247 | } | |
248 | ||
4c28d338 SW |
249 | static int gfs2_dir_read_stuffed(struct gfs2_inode *ip, __be64 *buf, |
250 | unsigned int size) | |
e13940ba SW |
251 | { |
252 | struct buffer_head *dibh; | |
253 | int error; | |
254 | ||
255 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
256 | if (!error) { | |
4c28d338 | 257 | memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); |
e13940ba SW |
258 | brelse(dibh); |
259 | } | |
260 | ||
261 | return (error) ? error : size; | |
262 | } | |
263 | ||
264 | ||
265 | /** | |
266 | * gfs2_dir_read_data - Read a data from a directory inode | |
267 | * @ip: The GFS2 Inode | |
268 | * @buf: The buffer to place result into | |
e13940ba SW |
269 | * @size: Amount of data to transfer |
270 | * | |
271 | * Returns: The amount of data actually copied or the error | |
272 | */ | |
4c28d338 SW |
273 | static int gfs2_dir_read_data(struct gfs2_inode *ip, __be64 *buf, |
274 | unsigned int size) | |
e13940ba | 275 | { |
feaa7bba | 276 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
cd915493 SW |
277 | u64 lblock, dblock; |
278 | u32 extlen = 0; | |
e13940ba SW |
279 | unsigned int o; |
280 | int copied = 0; | |
281 | int error = 0; | |
e13940ba SW |
282 | |
283 | if (gfs2_is_stuffed(ip)) | |
4c28d338 | 284 | return gfs2_dir_read_stuffed(ip, buf, size); |
e13940ba SW |
285 | |
286 | if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip))) | |
287 | return -EINVAL; | |
288 | ||
4c28d338 | 289 | lblock = 0; |
e13940ba SW |
290 | o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header); |
291 | ||
292 | while (copied < size) { | |
293 | unsigned int amount; | |
294 | struct buffer_head *bh; | |
295 | int new; | |
296 | ||
297 | amount = size - copied; | |
298 | if (amount > sdp->sd_sb.sb_bsize - o) | |
299 | amount = sdp->sd_sb.sb_bsize - o; | |
300 | ||
301 | if (!extlen) { | |
302 | new = 0; | |
feaa7bba | 303 | error = gfs2_extent_map(&ip->i_inode, lblock, &new, |
fd88de56 | 304 | &dblock, &extlen); |
7276b3b0 | 305 | if (error || !dblock) |
e13940ba | 306 | goto fail; |
7276b3b0 | 307 | BUG_ON(extlen < 1); |
7276b3b0 | 308 | bh = gfs2_meta_ra(ip->i_gl, dblock, extlen); |
b7d8ac3e | 309 | } else { |
c8d57703 | 310 | error = gfs2_meta_read(ip->i_gl, dblock, DIO_WAIT, 0, &bh); |
e13940ba SW |
311 | if (error) |
312 | goto fail; | |
7276b3b0 SW |
313 | } |
314 | error = gfs2_metatype_check(sdp, bh, GFS2_METATYPE_JD); | |
315 | if (error) { | |
316 | brelse(bh); | |
317 | goto fail; | |
318 | } | |
319 | dblock++; | |
320 | extlen--; | |
e13940ba SW |
321 | memcpy(buf, bh->b_data + o, amount); |
322 | brelse(bh); | |
4c28d338 | 323 | buf += (amount/sizeof(__be64)); |
e13940ba SW |
324 | copied += amount; |
325 | lblock++; | |
e13940ba SW |
326 | o = sizeof(struct gfs2_meta_header); |
327 | } | |
328 | ||
329 | return copied; | |
330 | fail: | |
331 | return (copied) ? copied : error; | |
332 | } | |
333 | ||
17d539f0 SW |
334 | /** |
335 | * gfs2_dir_get_hash_table - Get pointer to the dir hash table | |
336 | * @ip: The inode in question | |
337 | * | |
338 | * Returns: The hash table or an error | |
339 | */ | |
340 | ||
341 | static __be64 *gfs2_dir_get_hash_table(struct gfs2_inode *ip) | |
342 | { | |
343 | struct inode *inode = &ip->i_inode; | |
344 | int ret; | |
345 | u32 hsize; | |
346 | __be64 *hc; | |
347 | ||
348 | BUG_ON(!(ip->i_diskflags & GFS2_DIF_EXHASH)); | |
349 | ||
350 | hc = ip->i_hash_cache; | |
351 | if (hc) | |
352 | return hc; | |
353 | ||
354 | hsize = 1 << ip->i_depth; | |
355 | hsize *= sizeof(__be64); | |
356 | if (hsize != i_size_read(&ip->i_inode)) { | |
357 | gfs2_consist_inode(ip); | |
358 | return ERR_PTR(-EIO); | |
359 | } | |
360 | ||
e8830d88 BP |
361 | hc = kmalloc(hsize, GFP_NOFS | __GFP_NOWARN); |
362 | if (hc == NULL) | |
363 | hc = __vmalloc(hsize, GFP_NOFS, PAGE_KERNEL); | |
364 | ||
17d539f0 SW |
365 | if (hc == NULL) |
366 | return ERR_PTR(-ENOMEM); | |
367 | ||
4c28d338 | 368 | ret = gfs2_dir_read_data(ip, hc, hsize); |
17d539f0 | 369 | if (ret < 0) { |
3cdcf63e | 370 | kvfree(hc); |
17d539f0 SW |
371 | return ERR_PTR(ret); |
372 | } | |
373 | ||
374 | spin_lock(&inode->i_lock); | |
9265f1d0 | 375 | if (likely(!ip->i_hash_cache)) { |
17d539f0 | 376 | ip->i_hash_cache = hc; |
9265f1d0 AV |
377 | hc = NULL; |
378 | } | |
17d539f0 | 379 | spin_unlock(&inode->i_lock); |
9265f1d0 | 380 | kvfree(hc); |
17d539f0 SW |
381 | |
382 | return ip->i_hash_cache; | |
383 | } | |
384 | ||
385 | /** | |
386 | * gfs2_dir_hash_inval - Invalidate dir hash | |
387 | * @ip: The directory inode | |
388 | * | |
389 | * Must be called with an exclusive glock, or during glock invalidation. | |
390 | */ | |
391 | void gfs2_dir_hash_inval(struct gfs2_inode *ip) | |
392 | { | |
c36b97e9 BP |
393 | __be64 *hc; |
394 | ||
395 | spin_lock(&ip->i_inode.i_lock); | |
396 | hc = ip->i_hash_cache; | |
17d539f0 | 397 | ip->i_hash_cache = NULL; |
c36b97e9 BP |
398 | spin_unlock(&ip->i_inode.i_lock); |
399 | ||
3cdcf63e | 400 | kvfree(hc); |
17d539f0 SW |
401 | } |
402 | ||
5e7d65cd SW |
403 | static inline int gfs2_dirent_sentinel(const struct gfs2_dirent *dent) |
404 | { | |
405 | return dent->de_inum.no_addr == 0 || dent->de_inum.no_formal_ino == 0; | |
406 | } | |
407 | ||
c752666c SW |
408 | static inline int __gfs2_dirent_find(const struct gfs2_dirent *dent, |
409 | const struct qstr *name, int ret) | |
410 | { | |
5e7d65cd | 411 | if (!gfs2_dirent_sentinel(dent) && |
c752666c SW |
412 | be32_to_cpu(dent->de_hash) == name->hash && |
413 | be16_to_cpu(dent->de_name_len) == name->len && | |
2bdbc5d7 | 414 | memcmp(dent+1, name->name, name->len) == 0) |
c752666c SW |
415 | return ret; |
416 | return 0; | |
417 | } | |
418 | ||
419 | static int gfs2_dirent_find(const struct gfs2_dirent *dent, | |
71b86f56 SW |
420 | const struct qstr *name, |
421 | void *opaque) | |
c752666c SW |
422 | { |
423 | return __gfs2_dirent_find(dent, name, 1); | |
424 | } | |
425 | ||
426 | static int gfs2_dirent_prev(const struct gfs2_dirent *dent, | |
71b86f56 SW |
427 | const struct qstr *name, |
428 | void *opaque) | |
c752666c SW |
429 | { |
430 | return __gfs2_dirent_find(dent, name, 2); | |
431 | } | |
432 | ||
433 | /* | |
434 | * name->name holds ptr to start of block. | |
435 | * name->len holds size of block. | |
b3b94faa | 436 | */ |
c752666c | 437 | static int gfs2_dirent_last(const struct gfs2_dirent *dent, |
71b86f56 SW |
438 | const struct qstr *name, |
439 | void *opaque) | |
c752666c SW |
440 | { |
441 | const char *start = name->name; | |
442 | const char *end = (const char *)dent + be16_to_cpu(dent->de_rec_len); | |
443 | if (name->len == (end - start)) | |
444 | return 1; | |
445 | return 0; | |
446 | } | |
b3b94faa | 447 | |
34017472 BM |
448 | /* Look for the dirent that contains the offset specified in data. Once we |
449 | * find that dirent, there must be space available there for the new dirent */ | |
450 | static int gfs2_dirent_find_offset(const struct gfs2_dirent *dent, | |
451 | const struct qstr *name, | |
452 | void *ptr) | |
453 | { | |
454 | unsigned required = GFS2_DIRENT_SIZE(name->len); | |
455 | unsigned actual = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len)); | |
456 | unsigned totlen = be16_to_cpu(dent->de_rec_len); | |
457 | ||
458 | if (ptr < (void *)dent || ptr >= (void *)dent + totlen) | |
459 | return 0; | |
460 | if (gfs2_dirent_sentinel(dent)) | |
461 | actual = 0; | |
462 | if (ptr < (void *)dent + actual) | |
463 | return -1; | |
464 | if ((void *)dent + totlen >= ptr + required) | |
465 | return 1; | |
466 | return -1; | |
467 | } | |
468 | ||
c752666c | 469 | static int gfs2_dirent_find_space(const struct gfs2_dirent *dent, |
71b86f56 SW |
470 | const struct qstr *name, |
471 | void *opaque) | |
b3b94faa | 472 | { |
c752666c SW |
473 | unsigned required = GFS2_DIRENT_SIZE(name->len); |
474 | unsigned actual = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len)); | |
475 | unsigned totlen = be16_to_cpu(dent->de_rec_len); | |
476 | ||
5e7d65cd | 477 | if (gfs2_dirent_sentinel(dent)) |
728a756b | 478 | actual = 0; |
c5392124 | 479 | if (totlen - actual >= required) |
c752666c SW |
480 | return 1; |
481 | return 0; | |
482 | } | |
483 | ||
71b86f56 SW |
484 | struct dirent_gather { |
485 | const struct gfs2_dirent **pdent; | |
486 | unsigned offset; | |
487 | }; | |
488 | ||
489 | static int gfs2_dirent_gather(const struct gfs2_dirent *dent, | |
490 | const struct qstr *name, | |
491 | void *opaque) | |
492 | { | |
493 | struct dirent_gather *g = opaque; | |
5e7d65cd | 494 | if (!gfs2_dirent_sentinel(dent)) { |
71b86f56 SW |
495 | g->pdent[g->offset++] = dent; |
496 | } | |
497 | return 0; | |
498 | } | |
499 | ||
c752666c SW |
500 | /* |
501 | * Other possible things to check: | |
502 | * - Inode located within filesystem size (and on valid block) | |
503 | * - Valid directory entry type | |
504 | * Not sure how heavy-weight we want to make this... could also check | |
505 | * hash is correct for example, but that would take a lot of extra time. | |
506 | * For now the most important thing is to check that the various sizes | |
507 | * are correct. | |
508 | */ | |
509 | static int gfs2_check_dirent(struct gfs2_dirent *dent, unsigned int offset, | |
510 | unsigned int size, unsigned int len, int first) | |
511 | { | |
512 | const char *msg = "gfs2_dirent too small"; | |
513 | if (unlikely(size < sizeof(struct gfs2_dirent))) | |
514 | goto error; | |
515 | msg = "gfs2_dirent misaligned"; | |
516 | if (unlikely(offset & 0x7)) | |
517 | goto error; | |
518 | msg = "gfs2_dirent points beyond end of block"; | |
519 | if (unlikely(offset + size > len)) | |
520 | goto error; | |
521 | msg = "zero inode number"; | |
5e7d65cd | 522 | if (unlikely(!first && gfs2_dirent_sentinel(dent))) |
c752666c SW |
523 | goto error; |
524 | msg = "name length is greater than space in dirent"; | |
5e7d65cd | 525 | if (!gfs2_dirent_sentinel(dent) && |
c752666c SW |
526 | unlikely(sizeof(struct gfs2_dirent)+be16_to_cpu(dent->de_name_len) > |
527 | size)) | |
528 | goto error; | |
529 | return 0; | |
530 | error: | |
d77d1b58 JP |
531 | pr_warn("%s: %s (%s)\n", |
532 | __func__, msg, first ? "first in block" : "not first in block"); | |
c752666c | 533 | return -EIO; |
b3b94faa DT |
534 | } |
535 | ||
71b86f56 | 536 | static int gfs2_dirent_offset(const void *buf) |
c752666c | 537 | { |
71b86f56 SW |
538 | const struct gfs2_meta_header *h = buf; |
539 | int offset; | |
c752666c SW |
540 | |
541 | BUG_ON(buf == NULL); | |
c752666c | 542 | |
e3167ded | 543 | switch(be32_to_cpu(h->mh_type)) { |
c752666c SW |
544 | case GFS2_METATYPE_LF: |
545 | offset = sizeof(struct gfs2_leaf); | |
546 | break; | |
547 | case GFS2_METATYPE_DI: | |
548 | offset = sizeof(struct gfs2_dinode); | |
549 | break; | |
550 | default: | |
551 | goto wrong_type; | |
552 | } | |
71b86f56 SW |
553 | return offset; |
554 | wrong_type: | |
d77d1b58 | 555 | pr_warn("%s: wrong block type %u\n", __func__, be32_to_cpu(h->mh_type)); |
71b86f56 SW |
556 | return -1; |
557 | } | |
558 | ||
2bdbc5d7 | 559 | static struct gfs2_dirent *gfs2_dirent_scan(struct inode *inode, void *buf, |
71b86f56 SW |
560 | unsigned int len, gfs2_dscan_t scan, |
561 | const struct qstr *name, | |
562 | void *opaque) | |
563 | { | |
564 | struct gfs2_dirent *dent, *prev; | |
565 | unsigned offset; | |
566 | unsigned size; | |
567 | int ret = 0; | |
c752666c | 568 | |
71b86f56 SW |
569 | ret = gfs2_dirent_offset(buf); |
570 | if (ret < 0) | |
571 | goto consist_inode; | |
572 | ||
573 | offset = ret; | |
c752666c | 574 | prev = NULL; |
2bdbc5d7 | 575 | dent = buf + offset; |
c752666c SW |
576 | size = be16_to_cpu(dent->de_rec_len); |
577 | if (gfs2_check_dirent(dent, offset, size, len, 1)) | |
578 | goto consist_inode; | |
579 | do { | |
71b86f56 | 580 | ret = scan(dent, name, opaque); |
c752666c SW |
581 | if (ret) |
582 | break; | |
583 | offset += size; | |
584 | if (offset == len) | |
585 | break; | |
586 | prev = dent; | |
2bdbc5d7 | 587 | dent = buf + offset; |
c752666c SW |
588 | size = be16_to_cpu(dent->de_rec_len); |
589 | if (gfs2_check_dirent(dent, offset, size, len, 0)) | |
590 | goto consist_inode; | |
591 | } while(1); | |
592 | ||
593 | switch(ret) { | |
594 | case 0: | |
595 | return NULL; | |
596 | case 1: | |
597 | return dent; | |
598 | case 2: | |
599 | return prev ? prev : dent; | |
600 | default: | |
601 | BUG_ON(ret > 0); | |
602 | return ERR_PTR(ret); | |
603 | } | |
604 | ||
c752666c | 605 | consist_inode: |
feaa7bba | 606 | gfs2_consist_inode(GFS2_I(inode)); |
c752666c SW |
607 | return ERR_PTR(-EIO); |
608 | } | |
609 | ||
2bdbc5d7 SW |
610 | static int dirent_check_reclen(struct gfs2_inode *dip, |
611 | const struct gfs2_dirent *d, const void *end_p) | |
612 | { | |
613 | const void *ptr = d; | |
614 | u16 rec_len = be16_to_cpu(d->de_rec_len); | |
615 | ||
616 | if (unlikely(rec_len < sizeof(struct gfs2_dirent))) | |
617 | goto broken; | |
618 | ptr += rec_len; | |
619 | if (ptr < end_p) | |
620 | return rec_len; | |
621 | if (ptr == end_p) | |
622 | return -ENOENT; | |
623 | broken: | |
624 | gfs2_consist_inode(dip); | |
625 | return -EIO; | |
626 | } | |
627 | ||
b3b94faa DT |
628 | /** |
629 | * dirent_next - Next dirent | |
630 | * @dip: the directory | |
631 | * @bh: The buffer | |
632 | * @dent: Pointer to list of dirents | |
633 | * | |
634 | * Returns: 0 on success, error code otherwise | |
635 | */ | |
636 | ||
637 | static int dirent_next(struct gfs2_inode *dip, struct buffer_head *bh, | |
638 | struct gfs2_dirent **dent) | |
639 | { | |
2bdbc5d7 SW |
640 | struct gfs2_dirent *cur = *dent, *tmp; |
641 | char *bh_end = bh->b_data + bh->b_size; | |
642 | int ret; | |
b3b94faa | 643 | |
2bdbc5d7 SW |
644 | ret = dirent_check_reclen(dip, cur, bh_end); |
645 | if (ret < 0) | |
646 | return ret; | |
4dd651ad | 647 | |
2bdbc5d7 SW |
648 | tmp = (void *)cur + ret; |
649 | ret = dirent_check_reclen(dip, tmp, bh_end); | |
650 | if (ret == -EIO) | |
651 | return ret; | |
4dd651ad | 652 | |
b3b94faa | 653 | /* Only the first dent could ever have de_inum.no_addr == 0 */ |
5e7d65cd | 654 | if (gfs2_dirent_sentinel(tmp)) { |
b3b94faa DT |
655 | gfs2_consist_inode(dip); |
656 | return -EIO; | |
657 | } | |
658 | ||
659 | *dent = tmp; | |
b3b94faa DT |
660 | return 0; |
661 | } | |
662 | ||
663 | /** | |
664 | * dirent_del - Delete a dirent | |
665 | * @dip: The GFS2 inode | |
666 | * @bh: The buffer | |
667 | * @prev: The previous dirent | |
668 | * @cur: The current dirent | |
669 | * | |
670 | */ | |
671 | ||
672 | static void dirent_del(struct gfs2_inode *dip, struct buffer_head *bh, | |
673 | struct gfs2_dirent *prev, struct gfs2_dirent *cur) | |
674 | { | |
cd915493 | 675 | u16 cur_rec_len, prev_rec_len; |
b3b94faa | 676 | |
5e7d65cd | 677 | if (gfs2_dirent_sentinel(cur)) { |
b3b94faa DT |
678 | gfs2_consist_inode(dip); |
679 | return; | |
680 | } | |
681 | ||
350a9b0a | 682 | gfs2_trans_add_meta(dip->i_gl, bh); |
b3b94faa DT |
683 | |
684 | /* If there is no prev entry, this is the first entry in the block. | |
685 | The de_rec_len is already as big as it needs to be. Just zero | |
686 | out the inode number and return. */ | |
687 | ||
688 | if (!prev) { | |
5e7d65cd SW |
689 | cur->de_inum.no_addr = 0; |
690 | cur->de_inum.no_formal_ino = 0; | |
b3b94faa DT |
691 | return; |
692 | } | |
693 | ||
694 | /* Combine this dentry with the previous one. */ | |
695 | ||
fc69d0d3 SW |
696 | prev_rec_len = be16_to_cpu(prev->de_rec_len); |
697 | cur_rec_len = be16_to_cpu(cur->de_rec_len); | |
b3b94faa DT |
698 | |
699 | if ((char *)prev + prev_rec_len != (char *)cur) | |
700 | gfs2_consist_inode(dip); | |
701 | if ((char *)cur + cur_rec_len > bh->b_data + bh->b_size) | |
702 | gfs2_consist_inode(dip); | |
703 | ||
704 | prev_rec_len += cur_rec_len; | |
fc69d0d3 | 705 | prev->de_rec_len = cpu_to_be16(prev_rec_len); |
b3b94faa DT |
706 | } |
707 | ||
34017472 BM |
708 | |
709 | static struct gfs2_dirent *do_init_dirent(struct inode *inode, | |
710 | struct gfs2_dirent *dent, | |
711 | const struct qstr *name, | |
712 | struct buffer_head *bh, | |
713 | unsigned offset) | |
714 | { | |
715 | struct gfs2_inode *ip = GFS2_I(inode); | |
716 | struct gfs2_dirent *ndent; | |
717 | unsigned totlen; | |
718 | ||
719 | totlen = be16_to_cpu(dent->de_rec_len); | |
720 | BUG_ON(offset + name->len > totlen); | |
721 | gfs2_trans_add_meta(ip->i_gl, bh); | |
722 | ndent = (struct gfs2_dirent *)((char *)dent + offset); | |
723 | dent->de_rec_len = cpu_to_be16(offset); | |
724 | gfs2_qstr2dirent(name, totlen - offset, ndent); | |
725 | return ndent; | |
726 | } | |
727 | ||
728 | ||
c752666c SW |
729 | /* |
730 | * Takes a dent from which to grab space as an argument. Returns the | |
731 | * newly created dent. | |
b3b94faa | 732 | */ |
08bc2dbc AB |
733 | static struct gfs2_dirent *gfs2_init_dirent(struct inode *inode, |
734 | struct gfs2_dirent *dent, | |
735 | const struct qstr *name, | |
736 | struct buffer_head *bh) | |
b3b94faa | 737 | { |
34017472 | 738 | unsigned offset = 0; |
c752666c | 739 | |
5e7d65cd | 740 | if (!gfs2_dirent_sentinel(dent)) |
c752666c | 741 | offset = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len)); |
34017472 | 742 | return do_init_dirent(inode, dent, name, bh, offset); |
b3b94faa DT |
743 | } |
744 | ||
34017472 BM |
745 | static struct gfs2_dirent *gfs2_dirent_split_alloc(struct inode *inode, |
746 | struct buffer_head *bh, | |
747 | const struct qstr *name, | |
748 | void *ptr) | |
b3b94faa DT |
749 | { |
750 | struct gfs2_dirent *dent; | |
907b9bce | 751 | dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size, |
34017472 | 752 | gfs2_dirent_find_offset, name, ptr); |
c752666c SW |
753 | if (!dent || IS_ERR(dent)) |
754 | return dent; | |
34017472 BM |
755 | return do_init_dirent(inode, dent, name, bh, |
756 | (unsigned)(ptr - (void *)dent)); | |
b3b94faa DT |
757 | } |
758 | ||
cd915493 | 759 | static int get_leaf(struct gfs2_inode *dip, u64 leaf_no, |
b3b94faa DT |
760 | struct buffer_head **bhp) |
761 | { | |
762 | int error; | |
763 | ||
c8d57703 | 764 | error = gfs2_meta_read(dip->i_gl, leaf_no, DIO_WAIT, 0, bhp); |
feaa7bba | 765 | if (!error && gfs2_metatype_check(GFS2_SB(&dip->i_inode), *bhp, GFS2_METATYPE_LF)) { |
d77d1b58 | 766 | /* pr_info("block num=%llu\n", leaf_no); */ |
b3b94faa | 767 | error = -EIO; |
feaa7bba | 768 | } |
b3b94faa DT |
769 | |
770 | return error; | |
771 | } | |
772 | ||
773 | /** | |
774 | * get_leaf_nr - Get a leaf number associated with the index | |
775 | * @dip: The GFS2 inode | |
776 | * @index: | |
777 | * @leaf_out: | |
778 | * | |
779 | * Returns: 0 on success, error code otherwise | |
780 | */ | |
781 | ||
cd915493 SW |
782 | static int get_leaf_nr(struct gfs2_inode *dip, u32 index, |
783 | u64 *leaf_out) | |
b3b94faa | 784 | { |
17d539f0 | 785 | __be64 *hash; |
287980e4 | 786 | int error; |
b3b94faa | 787 | |
17d539f0 | 788 | hash = gfs2_dir_get_hash_table(dip); |
287980e4 AB |
789 | error = PTR_ERR_OR_ZERO(hash); |
790 | ||
791 | if (!error) | |
792 | *leaf_out = be64_to_cpu(*(hash + index)); | |
793 | ||
794 | return error; | |
b3b94faa DT |
795 | } |
796 | ||
cd915493 | 797 | static int get_first_leaf(struct gfs2_inode *dip, u32 index, |
b3b94faa DT |
798 | struct buffer_head **bh_out) |
799 | { | |
cd915493 | 800 | u64 leaf_no; |
b3b94faa DT |
801 | int error; |
802 | ||
803 | error = get_leaf_nr(dip, index, &leaf_no); | |
287980e4 | 804 | if (!error) |
b3b94faa DT |
805 | error = get_leaf(dip, leaf_no, bh_out); |
806 | ||
807 | return error; | |
808 | } | |
809 | ||
c752666c SW |
810 | static struct gfs2_dirent *gfs2_dirent_search(struct inode *inode, |
811 | const struct qstr *name, | |
812 | gfs2_dscan_t scan, | |
813 | struct buffer_head **pbh) | |
b3b94faa | 814 | { |
c752666c SW |
815 | struct buffer_head *bh; |
816 | struct gfs2_dirent *dent; | |
feaa7bba | 817 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
818 | int error; |
819 | ||
383f01fb | 820 | if (ip->i_diskflags & GFS2_DIF_EXHASH) { |
c752666c | 821 | struct gfs2_leaf *leaf; |
9a004508 | 822 | unsigned hsize = 1 << ip->i_depth; |
c752666c SW |
823 | unsigned index; |
824 | u64 ln; | |
a2e0f799 | 825 | if (hsize * sizeof(u64) != i_size_read(inode)) { |
c752666c SW |
826 | gfs2_consist_inode(ip); |
827 | return ERR_PTR(-EIO); | |
828 | } | |
907b9bce | 829 | |
9a004508 | 830 | index = name->hash >> (32 - ip->i_depth); |
c752666c SW |
831 | error = get_first_leaf(ip, index, &bh); |
832 | if (error) | |
833 | return ERR_PTR(error); | |
834 | do { | |
835 | dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size, | |
71b86f56 | 836 | scan, name, NULL); |
c752666c SW |
837 | if (dent) |
838 | goto got_dent; | |
839 | leaf = (struct gfs2_leaf *)bh->b_data; | |
840 | ln = be64_to_cpu(leaf->lf_next); | |
f4154ea0 | 841 | brelse(bh); |
c752666c SW |
842 | if (!ln) |
843 | break; | |
907b9bce | 844 | |
c752666c SW |
845 | error = get_leaf(ip, ln, &bh); |
846 | } while(!error); | |
b3b94faa | 847 | |
c752666c | 848 | return error ? ERR_PTR(error) : NULL; |
b3b94faa | 849 | } |
b3b94faa | 850 | |
907b9bce | 851 | |
c752666c SW |
852 | error = gfs2_meta_inode_buffer(ip, &bh); |
853 | if (error) | |
854 | return ERR_PTR(error); | |
71b86f56 | 855 | dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size, scan, name, NULL); |
c752666c | 856 | got_dent: |
f4154ea0 | 857 | if (unlikely(dent == NULL || IS_ERR(dent))) { |
ed386507 SW |
858 | brelse(bh); |
859 | bh = NULL; | |
860 | } | |
c752666c SW |
861 | *pbh = bh; |
862 | return dent; | |
863 | } | |
b3b94faa | 864 | |
c752666c SW |
865 | static struct gfs2_leaf *new_leaf(struct inode *inode, struct buffer_head **pbh, u16 depth) |
866 | { | |
feaa7bba | 867 | struct gfs2_inode *ip = GFS2_I(inode); |
b45e41d7 | 868 | unsigned int n = 1; |
09010978 SW |
869 | u64 bn; |
870 | int error; | |
871 | struct buffer_head *bh; | |
c752666c SW |
872 | struct gfs2_leaf *leaf; |
873 | struct gfs2_dirent *dent; | |
26fe5750 | 874 | struct qstr name = { .name = "" }; |
01bcb0de | 875 | struct timespec tv = CURRENT_TIME; |
09010978 | 876 | |
6e87ed0f | 877 | error = gfs2_alloc_blocks(ip, &bn, &n, 0, NULL); |
09010978 SW |
878 | if (error) |
879 | return NULL; | |
880 | bh = gfs2_meta_new(ip->i_gl, bn); | |
c752666c SW |
881 | if (!bh) |
882 | return NULL; | |
09010978 | 883 | |
5731be53 | 884 | gfs2_trans_add_unrevoke(GFS2_SB(inode), bn, 1); |
350a9b0a | 885 | gfs2_trans_add_meta(ip->i_gl, bh); |
c752666c SW |
886 | gfs2_metatype_set(bh, GFS2_METATYPE_LF, GFS2_FORMAT_LF); |
887 | leaf = (struct gfs2_leaf *)bh->b_data; | |
888 | leaf->lf_depth = cpu_to_be16(depth); | |
2bdbc5d7 | 889 | leaf->lf_entries = 0; |
a2d7d021 | 890 | leaf->lf_dirent_format = cpu_to_be32(GFS2_FORMAT_DE); |
2bdbc5d7 | 891 | leaf->lf_next = 0; |
01bcb0de SW |
892 | leaf->lf_inode = cpu_to_be64(ip->i_no_addr); |
893 | leaf->lf_dist = cpu_to_be32(1); | |
894 | leaf->lf_nsec = cpu_to_be32(tv.tv_nsec); | |
895 | leaf->lf_sec = cpu_to_be64(tv.tv_sec); | |
896 | memset(leaf->lf_reserved2, 0, sizeof(leaf->lf_reserved2)); | |
c752666c | 897 | dent = (struct gfs2_dirent *)(leaf+1); |
71b86f56 | 898 | gfs2_qstr2dirent(&name, bh->b_size - sizeof(struct gfs2_leaf), dent); |
c752666c SW |
899 | *pbh = bh; |
900 | return leaf; | |
b3b94faa DT |
901 | } |
902 | ||
903 | /** | |
904 | * dir_make_exhash - Convert a stuffed directory into an ExHash directory | |
905 | * @dip: The GFS2 inode | |
906 | * | |
907 | * Returns: 0 on success, error code otherwise | |
908 | */ | |
909 | ||
c752666c | 910 | static int dir_make_exhash(struct inode *inode) |
b3b94faa | 911 | { |
feaa7bba SW |
912 | struct gfs2_inode *dip = GFS2_I(inode); |
913 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
b3b94faa | 914 | struct gfs2_dirent *dent; |
c752666c | 915 | struct qstr args; |
b3b94faa DT |
916 | struct buffer_head *bh, *dibh; |
917 | struct gfs2_leaf *leaf; | |
918 | int y; | |
cd915493 | 919 | u32 x; |
b44b84d7 AV |
920 | __be64 *lp; |
921 | u64 bn; | |
b3b94faa DT |
922 | int error; |
923 | ||
924 | error = gfs2_meta_inode_buffer(dip, &dibh); | |
925 | if (error) | |
926 | return error; | |
927 | ||
b3b94faa DT |
928 | /* Turn over a new leaf */ |
929 | ||
c752666c SW |
930 | leaf = new_leaf(inode, &bh, 0); |
931 | if (!leaf) | |
932 | return -ENOSPC; | |
933 | bn = bh->b_blocknr; | |
b3b94faa | 934 | |
ad6203f2 SW |
935 | gfs2_assert(sdp, dip->i_entries < (1 << 16)); |
936 | leaf->lf_entries = cpu_to_be16(dip->i_entries); | |
b3b94faa DT |
937 | |
938 | /* Copy dirents */ | |
939 | ||
940 | gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_leaf), dibh, | |
941 | sizeof(struct gfs2_dinode)); | |
942 | ||
943 | /* Find last entry */ | |
944 | ||
945 | x = 0; | |
c752666c SW |
946 | args.len = bh->b_size - sizeof(struct gfs2_dinode) + |
947 | sizeof(struct gfs2_leaf); | |
948 | args.name = bh->b_data; | |
feaa7bba | 949 | dent = gfs2_dirent_scan(&dip->i_inode, bh->b_data, bh->b_size, |
71b86f56 | 950 | gfs2_dirent_last, &args, NULL); |
c752666c SW |
951 | if (!dent) { |
952 | brelse(bh); | |
953 | brelse(dibh); | |
954 | return -EIO; | |
955 | } | |
956 | if (IS_ERR(dent)) { | |
957 | brelse(bh); | |
958 | brelse(dibh); | |
959 | return PTR_ERR(dent); | |
b3b94faa | 960 | } |
b3b94faa DT |
961 | |
962 | /* Adjust the last dirent's record length | |
963 | (Remember that dent still points to the last entry.) */ | |
964 | ||
4dd651ad | 965 | dent->de_rec_len = cpu_to_be16(be16_to_cpu(dent->de_rec_len) + |
b3b94faa | 966 | sizeof(struct gfs2_dinode) - |
4dd651ad | 967 | sizeof(struct gfs2_leaf)); |
b3b94faa DT |
968 | |
969 | brelse(bh); | |
970 | ||
971 | /* We're done with the new leaf block, now setup the new | |
972 | hash table. */ | |
973 | ||
350a9b0a | 974 | gfs2_trans_add_meta(dip->i_gl, dibh); |
b3b94faa DT |
975 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
976 | ||
b44b84d7 | 977 | lp = (__be64 *)(dibh->b_data + sizeof(struct gfs2_dinode)); |
b3b94faa DT |
978 | |
979 | for (x = sdp->sd_hash_ptrs; x--; lp++) | |
980 | *lp = cpu_to_be64(bn); | |
981 | ||
a2e0f799 | 982 | i_size_write(inode, sdp->sd_sb.sb_bsize / 2); |
77658aad | 983 | gfs2_add_inode_blocks(&dip->i_inode, 1); |
383f01fb | 984 | dip->i_diskflags |= GFS2_DIF_EXHASH; |
b3b94faa DT |
985 | |
986 | for (x = sdp->sd_hash_ptrs, y = -1; x; x >>= 1, y++) ; | |
9a004508 | 987 | dip->i_depth = y; |
b3b94faa | 988 | |
539e5d6b | 989 | gfs2_dinode_out(dip, dibh->b_data); |
b3b94faa DT |
990 | |
991 | brelse(dibh); | |
992 | ||
993 | return 0; | |
994 | } | |
995 | ||
996 | /** | |
997 | * dir_split_leaf - Split a leaf block into two | |
998 | * @dip: The GFS2 inode | |
999 | * @index: | |
1000 | * @leaf_no: | |
1001 | * | |
1002 | * Returns: 0 on success, error code on failure | |
1003 | */ | |
1004 | ||
c752666c | 1005 | static int dir_split_leaf(struct inode *inode, const struct qstr *name) |
b3b94faa | 1006 | { |
feaa7bba | 1007 | struct gfs2_inode *dip = GFS2_I(inode); |
b3b94faa DT |
1008 | struct buffer_head *nbh, *obh, *dibh; |
1009 | struct gfs2_leaf *nleaf, *oleaf; | |
4da3c646 | 1010 | struct gfs2_dirent *dent = NULL, *prev = NULL, *next = NULL, *new; |
cd915493 | 1011 | u32 start, len, half_len, divider; |
b44b84d7 AV |
1012 | u64 bn, leaf_no; |
1013 | __be64 *lp; | |
cd915493 | 1014 | u32 index; |
b3b94faa DT |
1015 | int x, moved = 0; |
1016 | int error; | |
1017 | ||
9a004508 | 1018 | index = name->hash >> (32 - dip->i_depth); |
c752666c | 1019 | error = get_leaf_nr(dip, index, &leaf_no); |
287980e4 | 1020 | if (error) |
c752666c | 1021 | return error; |
b3b94faa DT |
1022 | |
1023 | /* Get the old leaf block */ | |
b3b94faa DT |
1024 | error = get_leaf(dip, leaf_no, &obh); |
1025 | if (error) | |
e90deff5 | 1026 | return error; |
b3b94faa | 1027 | |
b3b94faa | 1028 | oleaf = (struct gfs2_leaf *)obh->b_data; |
9a004508 | 1029 | if (dip->i_depth == be16_to_cpu(oleaf->lf_depth)) { |
e90deff5 SW |
1030 | brelse(obh); |
1031 | return 1; /* can't split */ | |
1032 | } | |
1033 | ||
350a9b0a | 1034 | gfs2_trans_add_meta(dip->i_gl, obh); |
b3b94faa | 1035 | |
c752666c SW |
1036 | nleaf = new_leaf(inode, &nbh, be16_to_cpu(oleaf->lf_depth) + 1); |
1037 | if (!nleaf) { | |
1038 | brelse(obh); | |
1039 | return -ENOSPC; | |
1040 | } | |
1041 | bn = nbh->b_blocknr; | |
b3b94faa | 1042 | |
c752666c | 1043 | /* Compute the start and len of leaf pointers in the hash table. */ |
9a004508 | 1044 | len = 1 << (dip->i_depth - be16_to_cpu(oleaf->lf_depth)); |
b3b94faa DT |
1045 | half_len = len >> 1; |
1046 | if (!half_len) { | |
d77d1b58 JP |
1047 | pr_warn("i_depth %u lf_depth %u index %u\n", |
1048 | dip->i_depth, be16_to_cpu(oleaf->lf_depth), index); | |
b3b94faa DT |
1049 | gfs2_consist_inode(dip); |
1050 | error = -EIO; | |
1051 | goto fail_brelse; | |
1052 | } | |
1053 | ||
1054 | start = (index & ~(len - 1)); | |
1055 | ||
1056 | /* Change the pointers. | |
1057 | Don't bother distinguishing stuffed from non-stuffed. | |
1058 | This code is complicated enough already. */ | |
4244b52e DR |
1059 | lp = kmalloc(half_len * sizeof(__be64), GFP_NOFS); |
1060 | if (!lp) { | |
1061 | error = -ENOMEM; | |
1062 | goto fail_brelse; | |
1063 | } | |
1064 | ||
b3b94faa | 1065 | /* Change the pointers */ |
b3b94faa DT |
1066 | for (x = 0; x < half_len; x++) |
1067 | lp[x] = cpu_to_be64(bn); | |
1068 | ||
17d539f0 SW |
1069 | gfs2_dir_hash_inval(dip); |
1070 | ||
cd915493 SW |
1071 | error = gfs2_dir_write_data(dip, (char *)lp, start * sizeof(u64), |
1072 | half_len * sizeof(u64)); | |
1073 | if (error != half_len * sizeof(u64)) { | |
b3b94faa DT |
1074 | if (error >= 0) |
1075 | error = -EIO; | |
1076 | goto fail_lpfree; | |
1077 | } | |
1078 | ||
1079 | kfree(lp); | |
1080 | ||
1081 | /* Compute the divider */ | |
9a004508 | 1082 | divider = (start + half_len) << (32 - dip->i_depth); |
b3b94faa DT |
1083 | |
1084 | /* Copy the entries */ | |
1579343a | 1085 | dent = (struct gfs2_dirent *)(obh->b_data + sizeof(struct gfs2_leaf)); |
b3b94faa DT |
1086 | |
1087 | do { | |
1088 | next = dent; | |
1089 | if (dirent_next(dip, obh, &next)) | |
1090 | next = NULL; | |
1091 | ||
5e7d65cd | 1092 | if (!gfs2_dirent_sentinel(dent) && |
b3b94faa | 1093 | be32_to_cpu(dent->de_hash) < divider) { |
c752666c | 1094 | struct qstr str; |
34017472 | 1095 | void *ptr = ((char *)dent - obh->b_data) + nbh->b_data; |
c752666c SW |
1096 | str.name = (char*)(dent+1); |
1097 | str.len = be16_to_cpu(dent->de_name_len); | |
1098 | str.hash = be32_to_cpu(dent->de_hash); | |
34017472 | 1099 | new = gfs2_dirent_split_alloc(inode, nbh, &str, ptr); |
c752666c SW |
1100 | if (IS_ERR(new)) { |
1101 | error = PTR_ERR(new); | |
1102 | break; | |
1103 | } | |
b3b94faa DT |
1104 | |
1105 | new->de_inum = dent->de_inum; /* No endian worries */ | |
b3b94faa | 1106 | new->de_type = dent->de_type; /* No endian worries */ |
bb16b342 | 1107 | be16_add_cpu(&nleaf->lf_entries, 1); |
b3b94faa DT |
1108 | |
1109 | dirent_del(dip, obh, prev, dent); | |
1110 | ||
1111 | if (!oleaf->lf_entries) | |
1112 | gfs2_consist_inode(dip); | |
bb16b342 | 1113 | be16_add_cpu(&oleaf->lf_entries, -1); |
b3b94faa DT |
1114 | |
1115 | if (!prev) | |
1116 | prev = dent; | |
1117 | ||
1118 | moved = 1; | |
c752666c | 1119 | } else { |
b3b94faa | 1120 | prev = dent; |
c752666c | 1121 | } |
b3b94faa | 1122 | dent = next; |
c752666c | 1123 | } while (dent); |
b3b94faa | 1124 | |
c752666c | 1125 | oleaf->lf_depth = nleaf->lf_depth; |
b3b94faa DT |
1126 | |
1127 | error = gfs2_meta_inode_buffer(dip, &dibh); | |
feaa7bba | 1128 | if (!gfs2_assert_withdraw(GFS2_SB(&dip->i_inode), !error)) { |
350a9b0a | 1129 | gfs2_trans_add_meta(dip->i_gl, dibh); |
77658aad | 1130 | gfs2_add_inode_blocks(&dip->i_inode, 1); |
539e5d6b | 1131 | gfs2_dinode_out(dip, dibh->b_data); |
b3b94faa DT |
1132 | brelse(dibh); |
1133 | } | |
1134 | ||
1135 | brelse(obh); | |
1136 | brelse(nbh); | |
1137 | ||
1138 | return error; | |
1139 | ||
e90deff5 | 1140 | fail_lpfree: |
b3b94faa DT |
1141 | kfree(lp); |
1142 | ||
e90deff5 | 1143 | fail_brelse: |
b3b94faa | 1144 | brelse(obh); |
b3b94faa DT |
1145 | brelse(nbh); |
1146 | return error; | |
1147 | } | |
1148 | ||
1149 | /** | |
1150 | * dir_double_exhash - Double size of ExHash table | |
1151 | * @dip: The GFS2 dinode | |
1152 | * | |
1153 | * Returns: 0 on success, error code on failure | |
1154 | */ | |
1155 | ||
1156 | static int dir_double_exhash(struct gfs2_inode *dip) | |
1157 | { | |
b3b94faa | 1158 | struct buffer_head *dibh; |
cd915493 | 1159 | u32 hsize; |
17d539f0 SW |
1160 | u32 hsize_bytes; |
1161 | __be64 *hc; | |
1162 | __be64 *hc2, *h; | |
b3b94faa DT |
1163 | int x; |
1164 | int error = 0; | |
1165 | ||
9a004508 | 1166 | hsize = 1 << dip->i_depth; |
17d539f0 | 1167 | hsize_bytes = hsize * sizeof(__be64); |
b3b94faa | 1168 | |
17d539f0 SW |
1169 | hc = gfs2_dir_get_hash_table(dip); |
1170 | if (IS_ERR(hc)) | |
1171 | return PTR_ERR(hc); | |
b3b94faa | 1172 | |
512cbf02 | 1173 | hc2 = kmalloc(hsize_bytes * 2, GFP_NOFS | __GFP_NOWARN); |
e8830d88 BP |
1174 | if (hc2 == NULL) |
1175 | hc2 = __vmalloc(hsize_bytes * 2, GFP_NOFS, PAGE_KERNEL); | |
1176 | ||
17d539f0 | 1177 | if (!hc2) |
4244b52e | 1178 | return -ENOMEM; |
b3b94faa | 1179 | |
512cbf02 | 1180 | h = hc2; |
17d539f0 SW |
1181 | error = gfs2_meta_inode_buffer(dip, &dibh); |
1182 | if (error) | |
1183 | goto out_kfree; | |
b3b94faa | 1184 | |
17d539f0 SW |
1185 | for (x = 0; x < hsize; x++) { |
1186 | *h++ = *hc; | |
1187 | *h++ = *hc; | |
1188 | hc++; | |
b3b94faa DT |
1189 | } |
1190 | ||
17d539f0 SW |
1191 | error = gfs2_dir_write_data(dip, (char *)hc2, 0, hsize_bytes * 2); |
1192 | if (error != (hsize_bytes * 2)) | |
1193 | goto fail; | |
b3b94faa | 1194 | |
17d539f0 SW |
1195 | gfs2_dir_hash_inval(dip); |
1196 | dip->i_hash_cache = hc2; | |
1197 | dip->i_depth++; | |
1198 | gfs2_dinode_out(dip, dibh->b_data); | |
1199 | brelse(dibh); | |
1200 | return 0; | |
b3b94faa | 1201 | |
a91ea69f | 1202 | fail: |
17d539f0 SW |
1203 | /* Replace original hash table & size */ |
1204 | gfs2_dir_write_data(dip, (char *)hc, 0, hsize_bytes); | |
1205 | i_size_write(&dip->i_inode, hsize_bytes); | |
1206 | gfs2_dinode_out(dip, dibh->b_data); | |
1207 | brelse(dibh); | |
1208 | out_kfree: | |
3cdcf63e | 1209 | kvfree(hc2); |
b3b94faa DT |
1210 | return error; |
1211 | } | |
1212 | ||
1213 | /** | |
1214 | * compare_dents - compare directory entries by hash value | |
1215 | * @a: first dent | |
1216 | * @b: second dent | |
1217 | * | |
1218 | * When comparing the hash entries of @a to @b: | |
1219 | * gt: returns 1 | |
1220 | * lt: returns -1 | |
1221 | * eq: returns 0 | |
1222 | */ | |
1223 | ||
1224 | static int compare_dents(const void *a, const void *b) | |
1225 | { | |
2bdbc5d7 | 1226 | const struct gfs2_dirent *dent_a, *dent_b; |
cd915493 | 1227 | u32 hash_a, hash_b; |
b3b94faa DT |
1228 | int ret = 0; |
1229 | ||
2bdbc5d7 | 1230 | dent_a = *(const struct gfs2_dirent **)a; |
471f3db2 | 1231 | hash_a = dent_a->de_cookie; |
b3b94faa | 1232 | |
2bdbc5d7 | 1233 | dent_b = *(const struct gfs2_dirent **)b; |
471f3db2 | 1234 | hash_b = dent_b->de_cookie; |
b3b94faa DT |
1235 | |
1236 | if (hash_a > hash_b) | |
1237 | ret = 1; | |
1238 | else if (hash_a < hash_b) | |
1239 | ret = -1; | |
1240 | else { | |
4dd651ad SW |
1241 | unsigned int len_a = be16_to_cpu(dent_a->de_name_len); |
1242 | unsigned int len_b = be16_to_cpu(dent_b->de_name_len); | |
b3b94faa DT |
1243 | |
1244 | if (len_a > len_b) | |
1245 | ret = 1; | |
1246 | else if (len_a < len_b) | |
1247 | ret = -1; | |
1248 | else | |
2bdbc5d7 | 1249 | ret = memcmp(dent_a + 1, dent_b + 1, len_a); |
b3b94faa DT |
1250 | } |
1251 | ||
1252 | return ret; | |
1253 | } | |
1254 | ||
1255 | /** | |
1256 | * do_filldir_main - read out directory entries | |
1257 | * @dip: The GFS2 inode | |
d81a8ef5 | 1258 | * @ctx: what to feed the entries to |
b3b94faa DT |
1259 | * @darr: an array of struct gfs2_dirent pointers to read |
1260 | * @entries: the number of entries in darr | |
1261 | * @copied: pointer to int that's non-zero if a entry has been copied out | |
1262 | * | |
1263 | * Jump through some hoops to make sure that if there are hash collsions, | |
1264 | * they are read out at the beginning of a buffer. We want to minimize | |
1265 | * the possibility that they will fall into different readdir buffers or | |
1266 | * that someone will want to seek to that location. | |
1267 | * | |
d81a8ef5 | 1268 | * Returns: errno, >0 if the actor tells you to stop |
b3b94faa DT |
1269 | */ |
1270 | ||
d81a8ef5 | 1271 | static int do_filldir_main(struct gfs2_inode *dip, struct dir_context *ctx, |
471f3db2 BM |
1272 | struct gfs2_dirent **darr, u32 entries, |
1273 | u32 sort_start, int *copied) | |
b3b94faa | 1274 | { |
71b86f56 | 1275 | const struct gfs2_dirent *dent, *dent_next; |
cd915493 | 1276 | u64 off, off_next; |
b3b94faa DT |
1277 | unsigned int x, y; |
1278 | int run = 0; | |
b3b94faa | 1279 | |
471f3db2 BM |
1280 | if (sort_start < entries) |
1281 | sort(&darr[sort_start], entries - sort_start, | |
1282 | sizeof(struct gfs2_dirent *), compare_dents, NULL); | |
b3b94faa DT |
1283 | |
1284 | dent_next = darr[0]; | |
471f3db2 | 1285 | off_next = dent_next->de_cookie; |
b3b94faa DT |
1286 | |
1287 | for (x = 0, y = 1; x < entries; x++, y++) { | |
1288 | dent = dent_next; | |
1289 | off = off_next; | |
1290 | ||
1291 | if (y < entries) { | |
1292 | dent_next = darr[y]; | |
471f3db2 | 1293 | off_next = dent_next->de_cookie; |
b3b94faa | 1294 | |
d81a8ef5 | 1295 | if (off < ctx->pos) |
b3b94faa | 1296 | continue; |
d81a8ef5 | 1297 | ctx->pos = off; |
b3b94faa DT |
1298 | |
1299 | if (off_next == off) { | |
1300 | if (*copied && !run) | |
1301 | return 1; | |
1302 | run = 1; | |
1303 | } else | |
1304 | run = 0; | |
1305 | } else { | |
d81a8ef5 | 1306 | if (off < ctx->pos) |
b3b94faa | 1307 | continue; |
d81a8ef5 | 1308 | ctx->pos = off; |
b3b94faa DT |
1309 | } |
1310 | ||
d81a8ef5 | 1311 | if (!dir_emit(ctx, (const char *)(dent + 1), |
4dd651ad | 1312 | be16_to_cpu(dent->de_name_len), |
d81a8ef5 AV |
1313 | be64_to_cpu(dent->de_inum.no_addr), |
1314 | be16_to_cpu(dent->de_type))) | |
b3b94faa DT |
1315 | return 1; |
1316 | ||
1317 | *copied = 1; | |
1318 | } | |
1319 | ||
d81a8ef5 | 1320 | /* Increment the ctx->pos by one, so the next time we come into the |
b3b94faa DT |
1321 | do_filldir fxn, we get the next entry instead of the last one in the |
1322 | current leaf */ | |
1323 | ||
d81a8ef5 | 1324 | ctx->pos++; |
b3b94faa DT |
1325 | |
1326 | return 0; | |
1327 | } | |
1328 | ||
d2a97a4e SW |
1329 | static void *gfs2_alloc_sort_buffer(unsigned size) |
1330 | { | |
1331 | void *ptr = NULL; | |
1332 | ||
1333 | if (size < KMALLOC_MAX_SIZE) | |
1334 | ptr = kmalloc(size, GFP_NOFS | __GFP_NOWARN); | |
1335 | if (!ptr) | |
1336 | ptr = __vmalloc(size, GFP_NOFS, PAGE_KERNEL); | |
1337 | return ptr; | |
1338 | } | |
1339 | ||
471f3db2 BM |
1340 | |
1341 | static int gfs2_set_cookies(struct gfs2_sbd *sdp, struct buffer_head *bh, | |
1342 | unsigned leaf_nr, struct gfs2_dirent **darr, | |
1343 | unsigned entries) | |
1344 | { | |
1345 | int sort_id = -1; | |
1346 | int i; | |
1347 | ||
1348 | for (i = 0; i < entries; i++) { | |
1349 | unsigned offset; | |
1350 | ||
1351 | darr[i]->de_cookie = be32_to_cpu(darr[i]->de_hash); | |
1352 | darr[i]->de_cookie = gfs2_disk_hash2offset(darr[i]->de_cookie); | |
1353 | ||
1354 | if (!sdp->sd_args.ar_loccookie) | |
1355 | continue; | |
1356 | offset = (char *)(darr[i]) - | |
1357 | (bh->b_data + gfs2_dirent_offset(bh->b_data)); | |
1358 | offset /= GFS2_MIN_DIRENT_SIZE; | |
1359 | offset += leaf_nr * sdp->sd_max_dents_per_leaf; | |
1360 | if (offset >= GFS2_USE_HASH_FLAG || | |
1361 | leaf_nr >= GFS2_USE_HASH_FLAG) { | |
1362 | darr[i]->de_cookie |= GFS2_USE_HASH_FLAG; | |
1363 | if (sort_id < 0) | |
1364 | sort_id = i; | |
1365 | continue; | |
1366 | } | |
1367 | darr[i]->de_cookie &= GFS2_HASH_INDEX_MASK; | |
1368 | darr[i]->de_cookie |= offset; | |
1369 | } | |
1370 | return sort_id; | |
1371 | } | |
1372 | ||
1373 | ||
d81a8ef5 AV |
1374 | static int gfs2_dir_read_leaf(struct inode *inode, struct dir_context *ctx, |
1375 | int *copied, unsigned *depth, | |
3699e3a4 | 1376 | u64 leaf_no) |
b3b94faa | 1377 | { |
feaa7bba | 1378 | struct gfs2_inode *ip = GFS2_I(inode); |
bdd19a22 | 1379 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
71b86f56 SW |
1380 | struct buffer_head *bh; |
1381 | struct gfs2_leaf *lf; | |
bdd19a22 | 1382 | unsigned entries = 0, entries2 = 0; |
471f3db2 BM |
1383 | unsigned leaves = 0, leaf = 0, offset, sort_offset; |
1384 | struct gfs2_dirent **darr, *dent; | |
71b86f56 SW |
1385 | struct dirent_gather g; |
1386 | struct buffer_head **larr; | |
471f3db2 | 1387 | int error, i, need_sort = 0, sort_id; |
71b86f56 | 1388 | u64 lfn = leaf_no; |
b3b94faa | 1389 | |
b3b94faa | 1390 | do { |
71b86f56 | 1391 | error = get_leaf(ip, lfn, &bh); |
b3b94faa | 1392 | if (error) |
71b86f56 SW |
1393 | goto out; |
1394 | lf = (struct gfs2_leaf *)bh->b_data; | |
1395 | if (leaves == 0) | |
1396 | *depth = be16_to_cpu(lf->lf_depth); | |
1397 | entries += be16_to_cpu(lf->lf_entries); | |
1398 | leaves++; | |
1399 | lfn = be64_to_cpu(lf->lf_next); | |
1400 | brelse(bh); | |
1401 | } while(lfn); | |
b3b94faa | 1402 | |
471f3db2 BM |
1403 | if (*depth < GFS2_DIR_MAX_DEPTH || !sdp->sd_args.ar_loccookie) { |
1404 | need_sort = 1; | |
1405 | sort_offset = 0; | |
1406 | } | |
1407 | ||
b3b94faa DT |
1408 | if (!entries) |
1409 | return 0; | |
1410 | ||
71b86f56 | 1411 | error = -ENOMEM; |
bdd19a22 SW |
1412 | /* |
1413 | * The extra 99 entries are not normally used, but are a buffer | |
1414 | * zone in case the number of entries in the leaf is corrupt. | |
1415 | * 99 is the maximum number of entries that can fit in a single | |
1416 | * leaf block. | |
1417 | */ | |
d2a97a4e | 1418 | larr = gfs2_alloc_sort_buffer((leaves + entries + 99) * sizeof(void *)); |
71b86f56 SW |
1419 | if (!larr) |
1420 | goto out; | |
471f3db2 BM |
1421 | darr = (struct gfs2_dirent **)(larr + leaves); |
1422 | g.pdent = (const struct gfs2_dirent **)darr; | |
71b86f56 SW |
1423 | g.offset = 0; |
1424 | lfn = leaf_no; | |
b3b94faa | 1425 | |
71b86f56 SW |
1426 | do { |
1427 | error = get_leaf(ip, lfn, &bh); | |
b3b94faa | 1428 | if (error) |
d2a97a4e | 1429 | goto out_free; |
71b86f56 SW |
1430 | lf = (struct gfs2_leaf *)bh->b_data; |
1431 | lfn = be64_to_cpu(lf->lf_next); | |
1432 | if (lf->lf_entries) { | |
471f3db2 | 1433 | offset = g.offset; |
bdd19a22 | 1434 | entries2 += be16_to_cpu(lf->lf_entries); |
71b86f56 SW |
1435 | dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size, |
1436 | gfs2_dirent_gather, NULL, &g); | |
1437 | error = PTR_ERR(dent); | |
bdd19a22 | 1438 | if (IS_ERR(dent)) |
d2a97a4e | 1439 | goto out_free; |
bdd19a22 | 1440 | if (entries2 != g.offset) { |
f391a4ea AM |
1441 | fs_warn(sdp, "Number of entries corrupt in dir " |
1442 | "leaf %llu, entries2 (%u) != " | |
1443 | "g.offset (%u)\n", | |
1444 | (unsigned long long)bh->b_blocknr, | |
1445 | entries2, g.offset); | |
bdd19a22 SW |
1446 | |
1447 | error = -EIO; | |
d2a97a4e | 1448 | goto out_free; |
71b86f56 SW |
1449 | } |
1450 | error = 0; | |
471f3db2 BM |
1451 | sort_id = gfs2_set_cookies(sdp, bh, leaf, &darr[offset], |
1452 | be16_to_cpu(lf->lf_entries)); | |
1453 | if (!need_sort && sort_id >= 0) { | |
1454 | need_sort = 1; | |
1455 | sort_offset = offset + sort_id; | |
1456 | } | |
71b86f56 | 1457 | larr[leaf++] = bh; |
b3b94faa | 1458 | } else { |
471f3db2 | 1459 | larr[leaf++] = NULL; |
71b86f56 | 1460 | brelse(bh); |
b3b94faa | 1461 | } |
71b86f56 | 1462 | } while(lfn); |
b3b94faa | 1463 | |
bdd19a22 | 1464 | BUG_ON(entries2 != entries); |
471f3db2 BM |
1465 | error = do_filldir_main(ip, ctx, darr, entries, need_sort ? |
1466 | sort_offset : entries, copied); | |
d2a97a4e | 1467 | out_free: |
71b86f56 | 1468 | for(i = 0; i < leaf; i++) |
471f3db2 BM |
1469 | if (larr[i]) |
1470 | brelse(larr[i]); | |
3cdcf63e | 1471 | kvfree(larr); |
71b86f56 | 1472 | out: |
b3b94faa DT |
1473 | return error; |
1474 | } | |
1475 | ||
79c4c379 SW |
1476 | /** |
1477 | * gfs2_dir_readahead - Issue read-ahead requests for leaf blocks. | |
dfe4d34b BP |
1478 | * |
1479 | * Note: we can't calculate each index like dir_e_read can because we don't | |
1480 | * have the leaf, and therefore we don't have the depth, and therefore we | |
1481 | * don't have the length. So we have to just read enough ahead to make up | |
79c4c379 SW |
1482 | * for the loss of information. |
1483 | */ | |
dfe4d34b BP |
1484 | static void gfs2_dir_readahead(struct inode *inode, unsigned hsize, u32 index, |
1485 | struct file_ra_state *f_ra) | |
1486 | { | |
1487 | struct gfs2_inode *ip = GFS2_I(inode); | |
1488 | struct gfs2_glock *gl = ip->i_gl; | |
1489 | struct buffer_head *bh; | |
1490 | u64 blocknr = 0, last; | |
1491 | unsigned count; | |
1492 | ||
1493 | /* First check if we've already read-ahead for the whole range. */ | |
79c4c379 | 1494 | if (index + MAX_RA_BLOCKS < f_ra->start) |
dfe4d34b BP |
1495 | return; |
1496 | ||
1497 | f_ra->start = max((pgoff_t)index, f_ra->start); | |
1498 | for (count = 0; count < MAX_RA_BLOCKS; count++) { | |
1499 | if (f_ra->start >= hsize) /* if exceeded the hash table */ | |
1500 | break; | |
1501 | ||
1502 | last = blocknr; | |
1503 | blocknr = be64_to_cpu(ip->i_hash_cache[f_ra->start]); | |
1504 | f_ra->start++; | |
1505 | if (blocknr == last) | |
1506 | continue; | |
1507 | ||
1508 | bh = gfs2_getbuf(gl, blocknr, 1); | |
1509 | if (trylock_buffer(bh)) { | |
1510 | if (buffer_uptodate(bh)) { | |
1511 | unlock_buffer(bh); | |
1512 | brelse(bh); | |
1513 | continue; | |
1514 | } | |
1515 | bh->b_end_io = end_buffer_read_sync; | |
1516 | submit_bh(READA | REQ_META, bh); | |
1517 | continue; | |
1518 | } | |
1519 | brelse(bh); | |
1520 | } | |
1521 | } | |
17d539f0 | 1522 | |
b3b94faa | 1523 | /** |
c752666c SW |
1524 | * dir_e_read - Reads the entries from a directory into a filldir buffer |
1525 | * @dip: dinode pointer | |
d81a8ef5 | 1526 | * @ctx: actor to feed the entries to |
b3b94faa | 1527 | * |
c752666c | 1528 | * Returns: errno |
b3b94faa DT |
1529 | */ |
1530 | ||
d81a8ef5 AV |
1531 | static int dir_e_read(struct inode *inode, struct dir_context *ctx, |
1532 | struct file_ra_state *f_ra) | |
b3b94faa | 1533 | { |
feaa7bba | 1534 | struct gfs2_inode *dip = GFS2_I(inode); |
cd915493 | 1535 | u32 hsize, len = 0; |
cd915493 | 1536 | u32 hash, index; |
b44b84d7 | 1537 | __be64 *lp; |
c752666c SW |
1538 | int copied = 0; |
1539 | int error = 0; | |
4da3c646 | 1540 | unsigned depth = 0; |
b3b94faa | 1541 | |
9a004508 | 1542 | hsize = 1 << dip->i_depth; |
d81a8ef5 | 1543 | hash = gfs2_dir_offset2hash(ctx->pos); |
9a004508 | 1544 | index = hash >> (32 - dip->i_depth); |
b3b94faa | 1545 | |
79c4c379 | 1546 | if (dip->i_hash_cache == NULL) |
dfe4d34b | 1547 | f_ra->start = 0; |
17d539f0 SW |
1548 | lp = gfs2_dir_get_hash_table(dip); |
1549 | if (IS_ERR(lp)) | |
1550 | return PTR_ERR(lp); | |
b3b94faa | 1551 | |
dfe4d34b BP |
1552 | gfs2_dir_readahead(inode, hsize, index, f_ra); |
1553 | ||
b3b94faa | 1554 | while (index < hsize) { |
d81a8ef5 | 1555 | error = gfs2_dir_read_leaf(inode, ctx, |
71b86f56 | 1556 | &copied, &depth, |
17d539f0 | 1557 | be64_to_cpu(lp[index])); |
b3b94faa | 1558 | if (error) |
71b86f56 | 1559 | break; |
b3b94faa | 1560 | |
9a004508 | 1561 | len = 1 << (dip->i_depth - depth); |
b3b94faa DT |
1562 | index = (index & ~(len - 1)) + len; |
1563 | } | |
1564 | ||
71b86f56 SW |
1565 | if (error > 0) |
1566 | error = 0; | |
b3b94faa DT |
1567 | return error; |
1568 | } | |
1569 | ||
d81a8ef5 AV |
1570 | int gfs2_dir_read(struct inode *inode, struct dir_context *ctx, |
1571 | struct file_ra_state *f_ra) | |
b3b94faa | 1572 | { |
feaa7bba | 1573 | struct gfs2_inode *dip = GFS2_I(inode); |
bdd19a22 | 1574 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
71b86f56 | 1575 | struct dirent_gather g; |
471f3db2 | 1576 | struct gfs2_dirent **darr, *dent; |
b3b94faa DT |
1577 | struct buffer_head *dibh; |
1578 | int copied = 0; | |
1579 | int error; | |
1580 | ||
ad6203f2 | 1581 | if (!dip->i_entries) |
71b86f56 SW |
1582 | return 0; |
1583 | ||
383f01fb | 1584 | if (dip->i_diskflags & GFS2_DIF_EXHASH) |
d81a8ef5 | 1585 | return dir_e_read(inode, ctx, f_ra); |
71b86f56 | 1586 | |
b3b94faa DT |
1587 | if (!gfs2_is_stuffed(dip)) { |
1588 | gfs2_consist_inode(dip); | |
1589 | return -EIO; | |
1590 | } | |
1591 | ||
b3b94faa DT |
1592 | error = gfs2_meta_inode_buffer(dip, &dibh); |
1593 | if (error) | |
1594 | return error; | |
1595 | ||
71b86f56 | 1596 | error = -ENOMEM; |
bdd19a22 | 1597 | /* 96 is max number of dirents which can be stuffed into an inode */ |
16c5f06f | 1598 | darr = kmalloc(96 * sizeof(struct gfs2_dirent *), GFP_NOFS); |
71b86f56 | 1599 | if (darr) { |
471f3db2 | 1600 | g.pdent = (const struct gfs2_dirent **)darr; |
71b86f56 SW |
1601 | g.offset = 0; |
1602 | dent = gfs2_dirent_scan(inode, dibh->b_data, dibh->b_size, | |
1603 | gfs2_dirent_gather, NULL, &g); | |
1604 | if (IS_ERR(dent)) { | |
1605 | error = PTR_ERR(dent); | |
1606 | goto out; | |
1607 | } | |
ad6203f2 | 1608 | if (dip->i_entries != g.offset) { |
bdd19a22 | 1609 | fs_warn(sdp, "Number of entries corrupt in dir %llu, " |
ad6203f2 | 1610 | "ip->i_entries (%u) != g.offset (%u)\n", |
dbb7cae2 | 1611 | (unsigned long long)dip->i_no_addr, |
ad6203f2 | 1612 | dip->i_entries, |
bdd19a22 SW |
1613 | g.offset); |
1614 | error = -EIO; | |
1615 | goto out; | |
1616 | } | |
471f3db2 | 1617 | gfs2_set_cookies(sdp, dibh, 0, darr, dip->i_entries); |
d81a8ef5 | 1618 | error = do_filldir_main(dip, ctx, darr, |
471f3db2 | 1619 | dip->i_entries, 0, &copied); |
71b86f56 SW |
1620 | out: |
1621 | kfree(darr); | |
1622 | } | |
1623 | ||
b3b94faa DT |
1624 | if (error > 0) |
1625 | error = 0; | |
1626 | ||
1627 | brelse(dibh); | |
1628 | ||
1629 | return error; | |
1630 | } | |
1631 | ||
b3b94faa DT |
1632 | /** |
1633 | * gfs2_dir_search - Search a directory | |
5a00f3cc SW |
1634 | * @dip: The GFS2 dir inode |
1635 | * @name: The name we are looking up | |
1636 | * @fail_on_exist: Fail if the name exists rather than looking it up | |
b3b94faa DT |
1637 | * |
1638 | * This routine searches a directory for a file or another directory. | |
1639 | * Assumes a glock is held on dip. | |
1640 | * | |
1641 | * Returns: errno | |
1642 | */ | |
1643 | ||
5a00f3cc SW |
1644 | struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *name, |
1645 | bool fail_on_exist) | |
b3b94faa | 1646 | { |
c752666c SW |
1647 | struct buffer_head *bh; |
1648 | struct gfs2_dirent *dent; | |
5a00f3cc SW |
1649 | u64 addr, formal_ino; |
1650 | u16 dtype; | |
dbb7cae2 SW |
1651 | |
1652 | dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh); | |
1653 | if (dent) { | |
c8d57703 AG |
1654 | struct inode *inode; |
1655 | u16 rahead; | |
1656 | ||
dbb7cae2 | 1657 | if (IS_ERR(dent)) |
e231c2ee | 1658 | return ERR_CAST(dent); |
5a00f3cc | 1659 | dtype = be16_to_cpu(dent->de_type); |
c8d57703 | 1660 | rahead = be16_to_cpu(dent->de_rahead); |
5a00f3cc SW |
1661 | addr = be64_to_cpu(dent->de_inum.no_addr); |
1662 | formal_ino = be64_to_cpu(dent->de_inum.no_formal_ino); | |
dbb7cae2 | 1663 | brelse(bh); |
5a00f3cc SW |
1664 | if (fail_on_exist) |
1665 | return ERR_PTR(-EEXIST); | |
73b462d2 | 1666 | inode = gfs2_inode_lookup(dir->i_sb, dtype, addr, formal_ino); |
c8d57703 AG |
1667 | if (!IS_ERR(inode)) |
1668 | GFS2_I(inode)->i_rahead = rahead; | |
1669 | return inode; | |
dbb7cae2 SW |
1670 | } |
1671 | return ERR_PTR(-ENOENT); | |
1672 | } | |
1673 | ||
1674 | int gfs2_dir_check(struct inode *dir, const struct qstr *name, | |
1675 | const struct gfs2_inode *ip) | |
1676 | { | |
1677 | struct buffer_head *bh; | |
1678 | struct gfs2_dirent *dent; | |
1679 | int ret = -ENOENT; | |
c752666c SW |
1680 | |
1681 | dent = gfs2_dirent_search(dir, name, gfs2_dirent_find, &bh); | |
1682 | if (dent) { | |
1683 | if (IS_ERR(dent)) | |
1684 | return PTR_ERR(dent); | |
dbb7cae2 SW |
1685 | if (ip) { |
1686 | if (be64_to_cpu(dent->de_inum.no_addr) != ip->i_no_addr) | |
1687 | goto out; | |
1688 | if (be64_to_cpu(dent->de_inum.no_formal_ino) != | |
1689 | ip->i_no_formal_ino) | |
1690 | goto out; | |
1691 | if (unlikely(IF2DT(ip->i_inode.i_mode) != | |
1692 | be16_to_cpu(dent->de_type))) { | |
1693 | gfs2_consist_inode(GFS2_I(dir)); | |
1694 | ret = -EIO; | |
1695 | goto out; | |
1696 | } | |
1697 | } | |
1698 | ret = 0; | |
1699 | out: | |
c752666c | 1700 | brelse(bh); |
c752666c | 1701 | } |
dbb7cae2 | 1702 | return ret; |
c752666c SW |
1703 | } |
1704 | ||
01bcb0de SW |
1705 | /** |
1706 | * dir_new_leaf - Add a new leaf onto hash chain | |
1707 | * @inode: The directory | |
1708 | * @name: The name we are adding | |
1709 | * | |
1710 | * This adds a new dir leaf onto an existing leaf when there is not | |
1711 | * enough space to add a new dir entry. This is a last resort after | |
1712 | * we've expanded the hash table to max size and also split existing | |
1713 | * leaf blocks, so it will only occur for very large directories. | |
1714 | * | |
1715 | * The dist parameter is set to 1 for leaf blocks directly attached | |
1716 | * to the hash table, 2 for one layer of indirection, 3 for two layers | |
1717 | * etc. We are thus able to tell the difference between an old leaf | |
1718 | * with dist set to zero (i.e. "don't know") and a new one where we | |
1719 | * set this information for debug/fsck purposes. | |
1720 | * | |
1721 | * Returns: 0 on success, or -ve on error | |
1722 | */ | |
1723 | ||
c752666c SW |
1724 | static int dir_new_leaf(struct inode *inode, const struct qstr *name) |
1725 | { | |
1726 | struct buffer_head *bh, *obh; | |
feaa7bba | 1727 | struct gfs2_inode *ip = GFS2_I(inode); |
c752666c | 1728 | struct gfs2_leaf *leaf, *oleaf; |
01bcb0de | 1729 | u32 dist = 1; |
b3b94faa | 1730 | int error; |
c752666c SW |
1731 | u32 index; |
1732 | u64 bn; | |
b3b94faa | 1733 | |
9a004508 | 1734 | index = name->hash >> (32 - ip->i_depth); |
c752666c SW |
1735 | error = get_first_leaf(ip, index, &obh); |
1736 | if (error) | |
1737 | return error; | |
1738 | do { | |
01bcb0de | 1739 | dist++; |
c752666c SW |
1740 | oleaf = (struct gfs2_leaf *)obh->b_data; |
1741 | bn = be64_to_cpu(oleaf->lf_next); | |
1742 | if (!bn) | |
1743 | break; | |
1744 | brelse(obh); | |
1745 | error = get_leaf(ip, bn, &obh); | |
1746 | if (error) | |
1747 | return error; | |
1748 | } while(1); | |
b3b94faa | 1749 | |
350a9b0a | 1750 | gfs2_trans_add_meta(ip->i_gl, obh); |
c752666c SW |
1751 | |
1752 | leaf = new_leaf(inode, &bh, be16_to_cpu(oleaf->lf_depth)); | |
1753 | if (!leaf) { | |
1754 | brelse(obh); | |
1755 | return -ENOSPC; | |
1756 | } | |
01bcb0de | 1757 | leaf->lf_dist = cpu_to_be32(dist); |
4d8012b6 | 1758 | oleaf->lf_next = cpu_to_be64(bh->b_blocknr); |
c752666c SW |
1759 | brelse(bh); |
1760 | brelse(obh); | |
1761 | ||
1762 | error = gfs2_meta_inode_buffer(ip, &bh); | |
1763 | if (error) | |
1764 | return error; | |
350a9b0a | 1765 | gfs2_trans_add_meta(ip->i_gl, bh); |
77658aad | 1766 | gfs2_add_inode_blocks(&ip->i_inode, 1); |
539e5d6b | 1767 | gfs2_dinode_out(ip, bh->b_data); |
c752666c SW |
1768 | brelse(bh); |
1769 | return 0; | |
b3b94faa DT |
1770 | } |
1771 | ||
44aaada9 SW |
1772 | static u16 gfs2_inode_ra_len(const struct gfs2_inode *ip) |
1773 | { | |
1774 | u64 where = ip->i_no_addr + 1; | |
1775 | if (ip->i_eattr == where) | |
1776 | return 1; | |
1777 | return 0; | |
1778 | } | |
1779 | ||
b3b94faa DT |
1780 | /** |
1781 | * gfs2_dir_add - Add new filename into directory | |
2b47dad8 SW |
1782 | * @inode: The directory inode |
1783 | * @name: The new name | |
1784 | * @nip: The GFS2 inode to be linked in to the directory | |
1785 | * @da: The directory addition info | |
1786 | * | |
1787 | * If the call to gfs2_diradd_alloc_required resulted in there being | |
1788 | * no need to allocate any new directory blocks, then it will contain | |
1789 | * a pointer to the directory entry and the bh in which it resides. We | |
1790 | * can use that without having to repeat the search. If there was no | |
1791 | * free space, then we must now create more space. | |
b3b94faa DT |
1792 | * |
1793 | * Returns: 0 on success, error code on failure | |
1794 | */ | |
1795 | ||
c752666c | 1796 | int gfs2_dir_add(struct inode *inode, const struct qstr *name, |
2b47dad8 | 1797 | const struct gfs2_inode *nip, struct gfs2_diradd *da) |
b3b94faa | 1798 | { |
feaa7bba | 1799 | struct gfs2_inode *ip = GFS2_I(inode); |
2b47dad8 SW |
1800 | struct buffer_head *bh = da->bh; |
1801 | struct gfs2_dirent *dent = da->dent; | |
01bcb0de | 1802 | struct timespec tv; |
c752666c | 1803 | struct gfs2_leaf *leaf; |
b3b94faa DT |
1804 | int error; |
1805 | ||
c752666c | 1806 | while(1) { |
2b47dad8 SW |
1807 | if (da->bh == NULL) { |
1808 | dent = gfs2_dirent_search(inode, name, | |
1809 | gfs2_dirent_find_space, &bh); | |
1810 | } | |
c752666c SW |
1811 | if (dent) { |
1812 | if (IS_ERR(dent)) | |
1813 | return PTR_ERR(dent); | |
1814 | dent = gfs2_init_dirent(inode, dent, name, bh); | |
dbb7cae2 | 1815 | gfs2_inum_out(nip, dent); |
3d6ecb7d | 1816 | dent->de_type = cpu_to_be16(IF2DT(nip->i_inode.i_mode)); |
44aaada9 | 1817 | dent->de_rahead = cpu_to_be16(gfs2_inode_ra_len(nip)); |
01bcb0de | 1818 | tv = CURRENT_TIME; |
383f01fb | 1819 | if (ip->i_diskflags & GFS2_DIF_EXHASH) { |
c752666c | 1820 | leaf = (struct gfs2_leaf *)bh->b_data; |
bb16b342 | 1821 | be16_add_cpu(&leaf->lf_entries, 1); |
01bcb0de SW |
1822 | leaf->lf_nsec = cpu_to_be32(tv.tv_nsec); |
1823 | leaf->lf_sec = cpu_to_be64(tv.tv_sec); | |
c752666c | 1824 | } |
2b47dad8 SW |
1825 | da->dent = NULL; |
1826 | da->bh = NULL; | |
c752666c | 1827 | brelse(bh); |
ad6203f2 | 1828 | ip->i_entries++; |
01bcb0de | 1829 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = tv; |
3d6ecb7d SW |
1830 | if (S_ISDIR(nip->i_inode.i_mode)) |
1831 | inc_nlink(&ip->i_inode); | |
343cd8f0 | 1832 | mark_inode_dirty(inode); |
c752666c SW |
1833 | error = 0; |
1834 | break; | |
1835 | } | |
383f01fb | 1836 | if (!(ip->i_diskflags & GFS2_DIF_EXHASH)) { |
c752666c SW |
1837 | error = dir_make_exhash(inode); |
1838 | if (error) | |
1839 | break; | |
1840 | continue; | |
1841 | } | |
1842 | error = dir_split_leaf(inode, name); | |
1843 | if (error == 0) | |
1844 | continue; | |
e90deff5 | 1845 | if (error < 0) |
c752666c | 1846 | break; |
9a004508 | 1847 | if (ip->i_depth < GFS2_DIR_MAX_DEPTH) { |
c752666c SW |
1848 | error = dir_double_exhash(ip); |
1849 | if (error) | |
1850 | break; | |
1851 | error = dir_split_leaf(inode, name); | |
e90deff5 | 1852 | if (error < 0) |
c752666c | 1853 | break; |
e90deff5 SW |
1854 | if (error == 0) |
1855 | continue; | |
c752666c SW |
1856 | } |
1857 | error = dir_new_leaf(inode, name); | |
1858 | if (!error) | |
1859 | continue; | |
1860 | error = -ENOSPC; | |
1861 | break; | |
1862 | } | |
b3b94faa DT |
1863 | return error; |
1864 | } | |
1865 | ||
c752666c | 1866 | |
b3b94faa DT |
1867 | /** |
1868 | * gfs2_dir_del - Delete a directory entry | |
1869 | * @dip: The GFS2 inode | |
1870 | * @filename: The filename | |
1871 | * | |
1872 | * Returns: 0 on success, error code on failure | |
1873 | */ | |
1874 | ||
855d23ce | 1875 | int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry) |
b3b94faa | 1876 | { |
855d23ce | 1877 | const struct qstr *name = &dentry->d_name; |
c752666c SW |
1878 | struct gfs2_dirent *dent, *prev = NULL; |
1879 | struct buffer_head *bh; | |
01bcb0de | 1880 | struct timespec tv = CURRENT_TIME; |
b3b94faa | 1881 | |
c752666c SW |
1882 | /* Returns _either_ the entry (if its first in block) or the |
1883 | previous entry otherwise */ | |
feaa7bba | 1884 | dent = gfs2_dirent_search(&dip->i_inode, name, gfs2_dirent_prev, &bh); |
c752666c SW |
1885 | if (!dent) { |
1886 | gfs2_consist_inode(dip); | |
1887 | return -EIO; | |
1888 | } | |
1889 | if (IS_ERR(dent)) { | |
1890 | gfs2_consist_inode(dip); | |
1891 | return PTR_ERR(dent); | |
1892 | } | |
1893 | /* If not first in block, adjust pointers accordingly */ | |
71b86f56 | 1894 | if (gfs2_dirent_find(dent, name, NULL) == 0) { |
c752666c SW |
1895 | prev = dent; |
1896 | dent = (struct gfs2_dirent *)((char *)dent + be16_to_cpu(prev->de_rec_len)); | |
1897 | } | |
1898 | ||
1899 | dirent_del(dip, bh, prev, dent); | |
383f01fb | 1900 | if (dip->i_diskflags & GFS2_DIF_EXHASH) { |
c752666c SW |
1901 | struct gfs2_leaf *leaf = (struct gfs2_leaf *)bh->b_data; |
1902 | u16 entries = be16_to_cpu(leaf->lf_entries); | |
1903 | if (!entries) | |
1904 | gfs2_consist_inode(dip); | |
1905 | leaf->lf_entries = cpu_to_be16(--entries); | |
01bcb0de SW |
1906 | leaf->lf_nsec = cpu_to_be32(tv.tv_nsec); |
1907 | leaf->lf_sec = cpu_to_be64(tv.tv_sec); | |
c752666c | 1908 | } |
ed386507 | 1909 | brelse(bh); |
c752666c | 1910 | |
ad6203f2 | 1911 | if (!dip->i_entries) |
c752666c | 1912 | gfs2_consist_inode(dip); |
ad6203f2 | 1913 | dip->i_entries--; |
01bcb0de | 1914 | dip->i_inode.i_mtime = dip->i_inode.i_ctime = tv; |
e36cb0b8 | 1915 | if (d_is_dir(dentry)) |
855d23ce | 1916 | drop_nlink(&dip->i_inode); |
feaa7bba | 1917 | mark_inode_dirty(&dip->i_inode); |
b3b94faa | 1918 | |
ab9bbda0 | 1919 | return 0; |
b3b94faa DT |
1920 | } |
1921 | ||
b3b94faa DT |
1922 | /** |
1923 | * gfs2_dir_mvino - Change inode number of directory entry | |
1924 | * @dip: The GFS2 inode | |
1925 | * @filename: | |
1926 | * @new_inode: | |
1927 | * | |
1928 | * This routine changes the inode number of a directory entry. It's used | |
1929 | * by rename to change ".." when a directory is moved. | |
1930 | * Assumes a glock is held on dvp. | |
1931 | * | |
1932 | * Returns: errno | |
1933 | */ | |
1934 | ||
c752666c | 1935 | int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename, |
dbb7cae2 | 1936 | const struct gfs2_inode *nip, unsigned int new_type) |
b3b94faa | 1937 | { |
c752666c SW |
1938 | struct buffer_head *bh; |
1939 | struct gfs2_dirent *dent; | |
b3b94faa DT |
1940 | int error; |
1941 | ||
feaa7bba | 1942 | dent = gfs2_dirent_search(&dip->i_inode, filename, gfs2_dirent_find, &bh); |
c752666c SW |
1943 | if (!dent) { |
1944 | gfs2_consist_inode(dip); | |
1945 | return -EIO; | |
1946 | } | |
1947 | if (IS_ERR(dent)) | |
1948 | return PTR_ERR(dent); | |
b3b94faa | 1949 | |
350a9b0a | 1950 | gfs2_trans_add_meta(dip->i_gl, bh); |
dbb7cae2 | 1951 | gfs2_inum_out(nip, dent); |
c752666c SW |
1952 | dent->de_type = cpu_to_be16(new_type); |
1953 | ||
383f01fb | 1954 | if (dip->i_diskflags & GFS2_DIF_EXHASH) { |
c752666c SW |
1955 | brelse(bh); |
1956 | error = gfs2_meta_inode_buffer(dip, &bh); | |
1957 | if (error) | |
1958 | return error; | |
350a9b0a | 1959 | gfs2_trans_add_meta(dip->i_gl, bh); |
c752666c SW |
1960 | } |
1961 | ||
4bd91ba1 | 1962 | dip->i_inode.i_mtime = dip->i_inode.i_ctime = CURRENT_TIME; |
539e5d6b | 1963 | gfs2_dinode_out(dip, bh->b_data); |
c752666c SW |
1964 | brelse(bh); |
1965 | return 0; | |
b3b94faa DT |
1966 | } |
1967 | ||
b3b94faa DT |
1968 | /** |
1969 | * leaf_dealloc - Deallocate a directory leaf | |
1970 | * @dip: the directory | |
1971 | * @index: the hash table offset in the directory | |
1972 | * @len: the number of pointers to this leaf | |
1973 | * @leaf_no: the leaf number | |
ec038c82 | 1974 | * @leaf_bh: buffer_head for the starting leaf |
d24a7a43 | 1975 | * last_dealloc: 1 if this is the final dealloc for the leaf, else 0 |
b3b94faa DT |
1976 | * |
1977 | * Returns: errno | |
1978 | */ | |
1979 | ||
cd915493 | 1980 | static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len, |
ec038c82 BP |
1981 | u64 leaf_no, struct buffer_head *leaf_bh, |
1982 | int last_dealloc) | |
b3b94faa | 1983 | { |
feaa7bba | 1984 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
c752666c | 1985 | struct gfs2_leaf *tmp_leaf; |
b3b94faa DT |
1986 | struct gfs2_rgrp_list rlist; |
1987 | struct buffer_head *bh, *dibh; | |
cd915493 | 1988 | u64 blk, nblk; |
b3b94faa DT |
1989 | unsigned int rg_blocks = 0, l_blocks = 0; |
1990 | char *ht; | |
cd915493 | 1991 | unsigned int x, size = len * sizeof(u64); |
b3b94faa DT |
1992 | int error; |
1993 | ||
5e2f7d61 BP |
1994 | error = gfs2_rindex_update(sdp); |
1995 | if (error) | |
1996 | return error; | |
1997 | ||
b3b94faa DT |
1998 | memset(&rlist, 0, sizeof(struct gfs2_rgrp_list)); |
1999 | ||
8be04b93 | 2000 | ht = kzalloc(size, GFP_NOFS | __GFP_NOWARN); |
e8830d88 | 2001 | if (ht == NULL) |
7456a37d OD |
2002 | ht = __vmalloc(size, GFP_NOFS | __GFP_NOWARN | __GFP_ZERO, |
2003 | PAGE_KERNEL); | |
b3b94faa DT |
2004 | if (!ht) |
2005 | return -ENOMEM; | |
2006 | ||
f4108a60 | 2007 | error = gfs2_quota_hold(dip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE); |
b3b94faa | 2008 | if (error) |
5407e242 | 2009 | goto out; |
b3b94faa | 2010 | |
b3b94faa | 2011 | /* Count the number of leaves */ |
ec038c82 | 2012 | bh = leaf_bh; |
b3b94faa | 2013 | |
c752666c | 2014 | for (blk = leaf_no; blk; blk = nblk) { |
ec038c82 BP |
2015 | if (blk != leaf_no) { |
2016 | error = get_leaf(dip, blk, &bh); | |
2017 | if (error) | |
2018 | goto out_rlist; | |
2019 | } | |
c752666c SW |
2020 | tmp_leaf = (struct gfs2_leaf *)bh->b_data; |
2021 | nblk = be64_to_cpu(tmp_leaf->lf_next); | |
ec038c82 BP |
2022 | if (blk != leaf_no) |
2023 | brelse(bh); | |
b3b94faa | 2024 | |
70b0c365 | 2025 | gfs2_rlist_add(dip, &rlist, blk); |
b3b94faa DT |
2026 | l_blocks++; |
2027 | } | |
2028 | ||
fe6c991c | 2029 | gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE); |
b3b94faa DT |
2030 | |
2031 | for (x = 0; x < rlist.rl_rgrps; x++) { | |
2032 | struct gfs2_rgrpd *rgd; | |
5c676f6d | 2033 | rgd = rlist.rl_ghs[x].gh_gl->gl_object; |
bb8d8a6f | 2034 | rg_blocks += rgd->rd_length; |
b3b94faa DT |
2035 | } |
2036 | ||
2037 | error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs); | |
2038 | if (error) | |
2039 | goto out_rlist; | |
2040 | ||
2041 | error = gfs2_trans_begin(sdp, | |
5c676f6d | 2042 | rg_blocks + (DIV_ROUND_UP(size, sdp->sd_jbsize) + 1) + |
b3b94faa DT |
2043 | RES_DINODE + RES_STATFS + RES_QUOTA, l_blocks); |
2044 | if (error) | |
2045 | goto out_rg_gunlock; | |
2046 | ||
ec038c82 BP |
2047 | bh = leaf_bh; |
2048 | ||
c752666c | 2049 | for (blk = leaf_no; blk; blk = nblk) { |
ec038c82 BP |
2050 | if (blk != leaf_no) { |
2051 | error = get_leaf(dip, blk, &bh); | |
2052 | if (error) | |
2053 | goto out_end_trans; | |
2054 | } | |
c752666c SW |
2055 | tmp_leaf = (struct gfs2_leaf *)bh->b_data; |
2056 | nblk = be64_to_cpu(tmp_leaf->lf_next); | |
ec038c82 BP |
2057 | if (blk != leaf_no) |
2058 | brelse(bh); | |
b3b94faa DT |
2059 | |
2060 | gfs2_free_meta(dip, blk, 1); | |
77658aad | 2061 | gfs2_add_inode_blocks(&dip->i_inode, -1); |
b3b94faa DT |
2062 | } |
2063 | ||
cd915493 | 2064 | error = gfs2_dir_write_data(dip, ht, index * sizeof(u64), size); |
b3b94faa DT |
2065 | if (error != size) { |
2066 | if (error >= 0) | |
2067 | error = -EIO; | |
2068 | goto out_end_trans; | |
2069 | } | |
2070 | ||
2071 | error = gfs2_meta_inode_buffer(dip, &dibh); | |
2072 | if (error) | |
2073 | goto out_end_trans; | |
2074 | ||
350a9b0a | 2075 | gfs2_trans_add_meta(dip->i_gl, dibh); |
d24a7a43 BP |
2076 | /* On the last dealloc, make this a regular file in case we crash. |
2077 | (We don't want to free these blocks a second time.) */ | |
2078 | if (last_dealloc) | |
2079 | dip->i_inode.i_mode = S_IFREG; | |
539e5d6b | 2080 | gfs2_dinode_out(dip, dibh->b_data); |
b3b94faa DT |
2081 | brelse(dibh); |
2082 | ||
a91ea69f | 2083 | out_end_trans: |
b3b94faa | 2084 | gfs2_trans_end(sdp); |
a91ea69f | 2085 | out_rg_gunlock: |
b3b94faa | 2086 | gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs); |
a91ea69f | 2087 | out_rlist: |
b3b94faa | 2088 | gfs2_rlist_free(&rlist); |
b3b94faa | 2089 | gfs2_quota_unhold(dip); |
182fe5ab | 2090 | out: |
3cdcf63e | 2091 | kvfree(ht); |
b3b94faa DT |
2092 | return error; |
2093 | } | |
2094 | ||
2095 | /** | |
2096 | * gfs2_dir_exhash_dealloc - free all the leaf blocks in a directory | |
2097 | * @dip: the directory | |
2098 | * | |
2099 | * Dealloc all on-disk directory leaves to FREEMETA state | |
2100 | * Change on-disk inode type to "regular file" | |
2101 | * | |
2102 | * Returns: errno | |
2103 | */ | |
2104 | ||
2105 | int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip) | |
2106 | { | |
556bb179 BP |
2107 | struct buffer_head *bh; |
2108 | struct gfs2_leaf *leaf; | |
2109 | u32 hsize, len; | |
556bb179 BP |
2110 | u32 index = 0, next_index; |
2111 | __be64 *lp; | |
2112 | u64 leaf_no; | |
2113 | int error = 0, last; | |
2114 | ||
2115 | hsize = 1 << dip->i_depth; | |
556bb179 | 2116 | |
17d539f0 SW |
2117 | lp = gfs2_dir_get_hash_table(dip); |
2118 | if (IS_ERR(lp)) | |
2119 | return PTR_ERR(lp); | |
556bb179 BP |
2120 | |
2121 | while (index < hsize) { | |
17d539f0 | 2122 | leaf_no = be64_to_cpu(lp[index]); |
556bb179 BP |
2123 | if (leaf_no) { |
2124 | error = get_leaf(dip, leaf_no, &bh); | |
2125 | if (error) | |
2126 | goto out; | |
2127 | leaf = (struct gfs2_leaf *)bh->b_data; | |
2128 | len = 1 << (dip->i_depth - be16_to_cpu(leaf->lf_depth)); | |
2129 | ||
2130 | next_index = (index & ~(len - 1)) + len; | |
2131 | last = ((next_index >= hsize) ? 1 : 0); | |
2132 | error = leaf_dealloc(dip, index, len, leaf_no, bh, | |
2133 | last); | |
2134 | brelse(bh); | |
2135 | if (error) | |
2136 | goto out; | |
2137 | index = next_index; | |
2138 | } else | |
2139 | index++; | |
2140 | } | |
2141 | ||
2142 | if (index != hsize) { | |
2143 | gfs2_consist_inode(dip); | |
2144 | error = -EIO; | |
2145 | } | |
2146 | ||
2147 | out: | |
556bb179 BP |
2148 | |
2149 | return error; | |
b3b94faa DT |
2150 | } |
2151 | ||
2152 | /** | |
2153 | * gfs2_diradd_alloc_required - find if adding entry will require an allocation | |
2154 | * @ip: the file being written to | |
2155 | * @filname: the filename that's going to be added | |
3c1c0ae1 | 2156 | * @da: The structure to return dir alloc info |
b3b94faa | 2157 | * |
3c1c0ae1 | 2158 | * Returns: 0 if ok, -ve on error |
b3b94faa DT |
2159 | */ |
2160 | ||
3c1c0ae1 SW |
2161 | int gfs2_diradd_alloc_required(struct inode *inode, const struct qstr *name, |
2162 | struct gfs2_diradd *da) | |
b3b94faa | 2163 | { |
22b5a6c0 | 2164 | struct gfs2_inode *ip = GFS2_I(inode); |
3c1c0ae1 | 2165 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
22b5a6c0 | 2166 | const unsigned int extra = sizeof(struct gfs2_dinode) - sizeof(struct gfs2_leaf); |
c752666c SW |
2167 | struct gfs2_dirent *dent; |
2168 | struct buffer_head *bh; | |
b3b94faa | 2169 | |
3c1c0ae1 | 2170 | da->nr_blocks = 0; |
2b47dad8 SW |
2171 | da->bh = NULL; |
2172 | da->dent = NULL; | |
3c1c0ae1 | 2173 | |
c752666c | 2174 | dent = gfs2_dirent_search(inode, name, gfs2_dirent_find_space, &bh); |
ed386507 | 2175 | if (!dent) { |
3c1c0ae1 | 2176 | da->nr_blocks = sdp->sd_max_dirres; |
22b5a6c0 SW |
2177 | if (!(ip->i_diskflags & GFS2_DIF_EXHASH) && |
2178 | (GFS2_DIRENT_SIZE(name->len) < extra)) | |
2179 | da->nr_blocks = 1; | |
3c1c0ae1 | 2180 | return 0; |
ed386507 | 2181 | } |
c752666c SW |
2182 | if (IS_ERR(dent)) |
2183 | return PTR_ERR(dent); | |
19aeb5a6 BP |
2184 | |
2185 | if (da->save_loc) { | |
2186 | da->bh = bh; | |
2187 | da->dent = dent; | |
2188 | } else { | |
2189 | brelse(bh); | |
2190 | } | |
c752666c | 2191 | return 0; |
b3b94faa DT |
2192 | } |
2193 |