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fix O_SYNC|O_APPEND syncing the wrong range on write()
[linux/fpc-iii.git] / fs / xfs / xfs_dir2_data.c
blob70acff4ee1739860a4ed8a311aa8ff2f2b33aafe
1 /*
2 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
3 * Copyright (c) 2013 Red Hat, Inc.
4 * All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it would be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19 #include "xfs.h"
20 #include "xfs_fs.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.h"
26 #include "xfs_mount.h"
27 #include "xfs_da_format.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_inode.h"
30 #include "xfs_dir2.h"
31 #include "xfs_dir2_priv.h"
32 #include "xfs_error.h"
33 #include "xfs_trans.h"
34 #include "xfs_buf_item.h"
35 #include "xfs_cksum.h"
36
37 /*
38 * Check the consistency of the data block.
39 * The input can also be a block-format directory.
40 * Return 0 is the buffer is good, otherwise an error.
41 */
42 int
43 __xfs_dir3_data_check(
44 struct xfs_inode *dp, /* incore inode pointer */
45 struct xfs_buf *bp) /* data block's buffer */
46 {
47 xfs_dir2_dataptr_t addr; /* addr for leaf lookup */
48 xfs_dir2_data_free_t *bf; /* bestfree table */
49 xfs_dir2_block_tail_t *btp=NULL; /* block tail */
50 int count; /* count of entries found */
51 xfs_dir2_data_hdr_t *hdr; /* data block header */
52 xfs_dir2_data_entry_t *dep; /* data entry */
53 xfs_dir2_data_free_t *dfp; /* bestfree entry */
54 xfs_dir2_data_unused_t *dup; /* unused entry */
55 char *endp; /* end of useful data */
56 int freeseen; /* mask of bestfrees seen */
57 xfs_dahash_t hash; /* hash of current name */
58 int i; /* leaf index */
59 int lastfree; /* last entry was unused */
60 xfs_dir2_leaf_entry_t *lep=NULL; /* block leaf entries */
61 xfs_mount_t *mp; /* filesystem mount point */
62 char *p; /* current data position */
63 int stale; /* count of stale leaves */
64 struct xfs_name name;
65 const struct xfs_dir_ops *ops;
66
67 mp = bp->b_target->bt_mount;
68
69 /*
70 * We can be passed a null dp here from a verifier, so we need to go the
71 * hard way to get them.
72 */
73 ops = xfs_dir_get_ops(mp, dp);
74
75 hdr = bp->b_addr;
76 p = (char *)ops->data_entry_p(hdr);
77
78 switch (hdr->magic) {
79 case cpu_to_be32(XFS_DIR3_BLOCK_MAGIC):
80 case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC):
81 btp = xfs_dir2_block_tail_p(mp, hdr);
82 lep = xfs_dir2_block_leaf_p(btp);
83 endp = (char *)lep;
84
85 /*
86 * The number of leaf entries is limited by the size of the
87 * block and the amount of space used by the data entries.
88 * We don't know how much space is used by the data entries yet,
89 * so just ensure that the count falls somewhere inside the
90 * block right now.
91 */
92 XFS_WANT_CORRUPTED_RETURN(be32_to_cpu(btp->count) <
93 ((char *)btp - p) / sizeof(struct xfs_dir2_leaf_entry));
94 break;
95 case cpu_to_be32(XFS_DIR3_DATA_MAGIC):
96 case cpu_to_be32(XFS_DIR2_DATA_MAGIC):
97 endp = (char *)hdr + mp->m_dirblksize;
98 break;
99 default:
100 XFS_ERROR_REPORT("Bad Magic", XFS_ERRLEVEL_LOW, mp);
101 return EFSCORRUPTED;
102 }
103
104 /*
105 * Account for zero bestfree entries.
106 */
107 bf = ops->data_bestfree_p(hdr);
108 count = lastfree = freeseen = 0;
109 if (!bf[0].length) {
110 XFS_WANT_CORRUPTED_RETURN(!bf[0].offset);
111 freeseen |= 1 << 0;
112 }
113 if (!bf[1].length) {
114 XFS_WANT_CORRUPTED_RETURN(!bf[1].offset);
115 freeseen |= 1 << 1;
116 }
117 if (!bf[2].length) {
118 XFS_WANT_CORRUPTED_RETURN(!bf[2].offset);
119 freeseen |= 1 << 2;
120 }
121
122 XFS_WANT_CORRUPTED_RETURN(be16_to_cpu(bf[0].length) >=
123 be16_to_cpu(bf[1].length));
124 XFS_WANT_CORRUPTED_RETURN(be16_to_cpu(bf[1].length) >=
125 be16_to_cpu(bf[2].length));
126 /*
127 * Loop over the data/unused entries.
128 */
129 while (p < endp) {
130 dup = (xfs_dir2_data_unused_t *)p;
131 /*
132 * If it's unused, look for the space in the bestfree table.
133 * If we find it, account for that, else make sure it
134 * doesn't need to be there.
135 */
136 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
137 XFS_WANT_CORRUPTED_RETURN(lastfree == 0);
138 XFS_WANT_CORRUPTED_RETURN(
139 be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)) ==
140 (char *)dup - (char *)hdr);
141 dfp = xfs_dir2_data_freefind(hdr, bf, dup);
142 if (dfp) {
143 i = (int)(dfp - bf);
144 XFS_WANT_CORRUPTED_RETURN(
145 (freeseen & (1 << i)) == 0);
146 freeseen |= 1 << i;
147 } else {
148 XFS_WANT_CORRUPTED_RETURN(
149 be16_to_cpu(dup->length) <=
150 be16_to_cpu(bf[2].length));
151 }
152 p += be16_to_cpu(dup->length);
153 lastfree = 1;
154 continue;
155 }
156 /*
157 * It's a real entry. Validate the fields.
158 * If this is a block directory then make sure it's
159 * in the leaf section of the block.
160 * The linear search is crude but this is DEBUG code.
161 */
162 dep = (xfs_dir2_data_entry_t *)p;
163 XFS_WANT_CORRUPTED_RETURN(dep->namelen != 0);
164 XFS_WANT_CORRUPTED_RETURN(
165 !xfs_dir_ino_validate(mp, be64_to_cpu(dep->inumber)));
166 XFS_WANT_CORRUPTED_RETURN(
167 be16_to_cpu(*ops->data_entry_tag_p(dep)) ==
168 (char *)dep - (char *)hdr);
169 XFS_WANT_CORRUPTED_RETURN(
170 ops->data_get_ftype(dep) < XFS_DIR3_FT_MAX);
171 count++;
172 lastfree = 0;
173 if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
174 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) {
175 addr = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
176 (xfs_dir2_data_aoff_t)
177 ((char *)dep - (char *)hdr));
178 name.name = dep->name;
179 name.len = dep->namelen;
180 hash = mp->m_dirnameops->hashname(&name);
181 for (i = 0; i < be32_to_cpu(btp->count); i++) {
182 if (be32_to_cpu(lep[i].address) == addr &&
183 be32_to_cpu(lep[i].hashval) == hash)
184 break;
185 }
186 XFS_WANT_CORRUPTED_RETURN(i < be32_to_cpu(btp->count));
187 }
188 p += ops->data_entsize(dep->namelen);
189 }
190 /*
191 * Need to have seen all the entries and all the bestfree slots.
192 */
193 XFS_WANT_CORRUPTED_RETURN(freeseen == 7);
194 if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
195 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) {
196 for (i = stale = 0; i < be32_to_cpu(btp->count); i++) {
197 if (lep[i].address ==
198 cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
199 stale++;
200 if (i > 0)
201 XFS_WANT_CORRUPTED_RETURN(
202 be32_to_cpu(lep[i].hashval) >=
203 be32_to_cpu(lep[i - 1].hashval));
204 }
205 XFS_WANT_CORRUPTED_RETURN(count ==
206 be32_to_cpu(btp->count) - be32_to_cpu(btp->stale));
207 XFS_WANT_CORRUPTED_RETURN(stale == be32_to_cpu(btp->stale));
208 }
209 return 0;
210 }
211
212 static bool
213 xfs_dir3_data_verify(
214 struct xfs_buf *bp)
215 {
216 struct xfs_mount *mp = bp->b_target->bt_mount;
217 struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
218
219 if (xfs_sb_version_hascrc(&mp->m_sb)) {
220 if (hdr3->magic != cpu_to_be32(XFS_DIR3_DATA_MAGIC))
221 return false;
222 if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_uuid))
223 return false;
224 if (be64_to_cpu(hdr3->blkno) != bp->b_bn)
225 return false;
226 } else {
227 if (hdr3->magic != cpu_to_be32(XFS_DIR2_DATA_MAGIC))
228 return false;
229 }
230 if (__xfs_dir3_data_check(NULL, bp))
231 return false;
232 return true;
233 }
234
235 /*
236 * Readahead of the first block of the directory when it is opened is completely
237 * oblivious to the format of the directory. Hence we can either get a block
238 * format buffer or a data format buffer on readahead.
239 */
240 static void
241 xfs_dir3_data_reada_verify(
242 struct xfs_buf *bp)
243 {
244 struct xfs_mount *mp = bp->b_target->bt_mount;
245 struct xfs_dir2_data_hdr *hdr = bp->b_addr;
246
247 switch (hdr->magic) {
248 case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC):
249 case cpu_to_be32(XFS_DIR3_BLOCK_MAGIC):
250 bp->b_ops = &xfs_dir3_block_buf_ops;
251 bp->b_ops->verify_read(bp);
252 return;
253 case cpu_to_be32(XFS_DIR2_DATA_MAGIC):
254 case cpu_to_be32(XFS_DIR3_DATA_MAGIC):
255 xfs_dir3_data_verify(bp);
256 return;
257 default:
258 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, hdr);
259 xfs_buf_ioerror(bp, EFSCORRUPTED);
260 break;
261 }
262 }
263
264 static void
265 xfs_dir3_data_read_verify(
266 struct xfs_buf *bp)
267 {
268 struct xfs_mount *mp = bp->b_target->bt_mount;
269
270 if ((xfs_sb_version_hascrc(&mp->m_sb) &&
271 !xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),
272 XFS_DIR3_DATA_CRC_OFF)) ||
273 !xfs_dir3_data_verify(bp)) {
274 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
275 xfs_buf_ioerror(bp, EFSCORRUPTED);
276 }
277 }
278
279 static void
280 xfs_dir3_data_write_verify(
281 struct xfs_buf *bp)
282 {
283 struct xfs_mount *mp = bp->b_target->bt_mount;
284 struct xfs_buf_log_item *bip = bp->b_fspriv;
285 struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
286
287 if (!xfs_dir3_data_verify(bp)) {
288 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
289 xfs_buf_ioerror(bp, EFSCORRUPTED);
290 return;
291 }
292
293 if (!xfs_sb_version_hascrc(&mp->m_sb))
294 return;
295
296 if (bip)
297 hdr3->lsn = cpu_to_be64(bip->bli_item.li_lsn);
298
299 xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), XFS_DIR3_DATA_CRC_OFF);
300 }
301
302 const struct xfs_buf_ops xfs_dir3_data_buf_ops = {
303 .verify_read = xfs_dir3_data_read_verify,
304 .verify_write = xfs_dir3_data_write_verify,
305 };
306
307 static const struct xfs_buf_ops xfs_dir3_data_reada_buf_ops = {
308 .verify_read = xfs_dir3_data_reada_verify,
309 .verify_write = xfs_dir3_data_write_verify,
310 };
311
312
313 int
314 xfs_dir3_data_read(
315 struct xfs_trans *tp,
316 struct xfs_inode *dp,
317 xfs_dablk_t bno,
318 xfs_daddr_t mapped_bno,
319 struct xfs_buf **bpp)
320 {
321 int err;
322
323 err = xfs_da_read_buf(tp, dp, bno, mapped_bno, bpp,
324 XFS_DATA_FORK, &xfs_dir3_data_buf_ops);
325 if (!err && tp)
326 xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_DATA_BUF);
327 return err;
328 }
329
330 int
331 xfs_dir3_data_readahead(
332 struct xfs_trans *tp,
333 struct xfs_inode *dp,
334 xfs_dablk_t bno,
335 xfs_daddr_t mapped_bno)
336 {
337 return xfs_da_reada_buf(tp, dp, bno, mapped_bno,
338 XFS_DATA_FORK, &xfs_dir3_data_reada_buf_ops);
339 }
340
341 /*
342 * Given a data block and an unused entry from that block,
343 * return the bestfree entry if any that corresponds to it.
344 */
345 xfs_dir2_data_free_t *
346 xfs_dir2_data_freefind(
347 struct xfs_dir2_data_hdr *hdr, /* data block header */
348 struct xfs_dir2_data_free *bf, /* bestfree table pointer */
349 struct xfs_dir2_data_unused *dup) /* unused space */
350 {
351 xfs_dir2_data_free_t *dfp; /* bestfree entry */
352 xfs_dir2_data_aoff_t off; /* offset value needed */
353 #ifdef DEBUG
354 int matched; /* matched the value */
355 int seenzero; /* saw a 0 bestfree entry */
356 #endif
357
358 off = (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr);
359
360 #ifdef DEBUG
361 /*
362 * Validate some consistency in the bestfree table.
363 * Check order, non-overlapping entries, and if we find the
364 * one we're looking for it has to be exact.
365 */
366 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
367 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
368 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
369 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
370 for (dfp = &bf[0], seenzero = matched = 0;
371 dfp < &bf[XFS_DIR2_DATA_FD_COUNT];
372 dfp++) {
373 if (!dfp->offset) {
374 ASSERT(!dfp->length);
375 seenzero = 1;
376 continue;
377 }
378 ASSERT(seenzero == 0);
379 if (be16_to_cpu(dfp->offset) == off) {
380 matched = 1;
381 ASSERT(dfp->length == dup->length);
382 } else if (off < be16_to_cpu(dfp->offset))
383 ASSERT(off + be16_to_cpu(dup->length) <= be16_to_cpu(dfp->offset));
384 else
385 ASSERT(be16_to_cpu(dfp->offset) + be16_to_cpu(dfp->length) <= off);
386 ASSERT(matched || be16_to_cpu(dfp->length) >= be16_to_cpu(dup->length));
387 if (dfp > &bf[0])
388 ASSERT(be16_to_cpu(dfp[-1].length) >= be16_to_cpu(dfp[0].length));
389 }
390 #endif
391 /*
392 * If this is smaller than the smallest bestfree entry,
393 * it can't be there since they're sorted.
394 */
395 if (be16_to_cpu(dup->length) <
396 be16_to_cpu(bf[XFS_DIR2_DATA_FD_COUNT - 1].length))
397 return NULL;
398 /*
399 * Look at the three bestfree entries for our guy.
400 */
401 for (dfp = &bf[0]; dfp < &bf[XFS_DIR2_DATA_FD_COUNT]; dfp++) {
402 if (!dfp->offset)
403 return NULL;
404 if (be16_to_cpu(dfp->offset) == off)
405 return dfp;
406 }
407 /*
408 * Didn't find it. This only happens if there are duplicate lengths.
409 */
410 return NULL;
411 }
412
413 /*
414 * Insert an unused-space entry into the bestfree table.
415 */
416 xfs_dir2_data_free_t * /* entry inserted */
417 xfs_dir2_data_freeinsert(
418 struct xfs_dir2_data_hdr *hdr, /* data block pointer */
419 struct xfs_dir2_data_free *dfp, /* bestfree table pointer */
420 struct xfs_dir2_data_unused *dup, /* unused space */
421 int *loghead) /* log the data header (out) */
422 {
423 xfs_dir2_data_free_t new; /* new bestfree entry */
424
425 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
426 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
427 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
428 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
429
430 new.length = dup->length;
431 new.offset = cpu_to_be16((char *)dup - (char *)hdr);
432
433 /*
434 * Insert at position 0, 1, or 2; or not at all.
435 */
436 if (be16_to_cpu(new.length) > be16_to_cpu(dfp[0].length)) {
437 dfp[2] = dfp[1];
438 dfp[1] = dfp[0];
439 dfp[0] = new;
440 *loghead = 1;
441 return &dfp[0];
442 }
443 if (be16_to_cpu(new.length) > be16_to_cpu(dfp[1].length)) {
444 dfp[2] = dfp[1];
445 dfp[1] = new;
446 *loghead = 1;
447 return &dfp[1];
448 }
449 if (be16_to_cpu(new.length) > be16_to_cpu(dfp[2].length)) {
450 dfp[2] = new;
451 *loghead = 1;
452 return &dfp[2];
453 }
454 return NULL;
455 }
456
457 /*
458 * Remove a bestfree entry from the table.
459 */
460 STATIC void
461 xfs_dir2_data_freeremove(
462 struct xfs_dir2_data_hdr *hdr, /* data block header */
463 struct xfs_dir2_data_free *bf, /* bestfree table pointer */
464 struct xfs_dir2_data_free *dfp, /* bestfree entry pointer */
465 int *loghead) /* out: log data header */
466 {
467
468 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
469 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
470 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
471 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
472
473 /*
474 * It's the first entry, slide the next 2 up.
475 */
476 if (dfp == &bf[0]) {
477 bf[0] = bf[1];
478 bf[1] = bf[2];
479 }
480 /*
481 * It's the second entry, slide the 3rd entry up.
482 */
483 else if (dfp == &bf[1])
484 bf[1] = bf[2];
485 /*
486 * Must be the last entry.
487 */
488 else
489 ASSERT(dfp == &bf[2]);
490 /*
491 * Clear the 3rd entry, must be zero now.
492 */
493 bf[2].length = 0;
494 bf[2].offset = 0;
495 *loghead = 1;
496 }
497
498 /*
499 * Given a data block, reconstruct its bestfree map.
500 */
501 void
502 xfs_dir2_data_freescan(
503 struct xfs_inode *dp,
504 struct xfs_dir2_data_hdr *hdr,
505 int *loghead)
506 {
507 xfs_dir2_block_tail_t *btp; /* block tail */
508 xfs_dir2_data_entry_t *dep; /* active data entry */
509 xfs_dir2_data_unused_t *dup; /* unused data entry */
510 struct xfs_dir2_data_free *bf;
511 char *endp; /* end of block's data */
512 char *p; /* current entry pointer */
513
514 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
515 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
516 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
517 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
518
519 /*
520 * Start by clearing the table.
521 */
522 bf = dp->d_ops->data_bestfree_p(hdr);
523 memset(bf, 0, sizeof(*bf) * XFS_DIR2_DATA_FD_COUNT);
524 *loghead = 1;
525 /*
526 * Set up pointers.
527 */
528 p = (char *)dp->d_ops->data_entry_p(hdr);
529 if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
530 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) {
531 btp = xfs_dir2_block_tail_p(dp->i_mount, hdr);
532 endp = (char *)xfs_dir2_block_leaf_p(btp);
533 } else
534 endp = (char *)hdr + dp->i_mount->m_dirblksize;
535 /*
536 * Loop over the block's entries.
537 */
538 while (p < endp) {
539 dup = (xfs_dir2_data_unused_t *)p;
540 /*
541 * If it's a free entry, insert it.
542 */
543 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
544 ASSERT((char *)dup - (char *)hdr ==
545 be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)));
546 xfs_dir2_data_freeinsert(hdr, bf, dup, loghead);
547 p += be16_to_cpu(dup->length);
548 }
549 /*
550 * For active entries, check their tags and skip them.
551 */
552 else {
553 dep = (xfs_dir2_data_entry_t *)p;
554 ASSERT((char *)dep - (char *)hdr ==
555 be16_to_cpu(*dp->d_ops->data_entry_tag_p(dep)));
556 p += dp->d_ops->data_entsize(dep->namelen);
557 }
558 }
559 }
560
561 /*
562 * Initialize a data block at the given block number in the directory.
563 * Give back the buffer for the created block.
564 */
565 int /* error */
566 xfs_dir3_data_init(
567 xfs_da_args_t *args, /* directory operation args */
568 xfs_dir2_db_t blkno, /* logical dir block number */
569 struct xfs_buf **bpp) /* output block buffer */
570 {
571 struct xfs_buf *bp; /* block buffer */
572 xfs_dir2_data_hdr_t *hdr; /* data block header */
573 xfs_inode_t *dp; /* incore directory inode */
574 xfs_dir2_data_unused_t *dup; /* unused entry pointer */
575 struct xfs_dir2_data_free *bf;
576 int error; /* error return value */
577 int i; /* bestfree index */
578 xfs_mount_t *mp; /* filesystem mount point */
579 xfs_trans_t *tp; /* transaction pointer */
580 int t; /* temp */
581
582 dp = args->dp;
583 mp = dp->i_mount;
584 tp = args->trans;
585 /*
586 * Get the buffer set up for the block.
587 */
588 error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(mp, blkno), -1, &bp,
589 XFS_DATA_FORK);
590 if (error)
591 return error;
592 bp->b_ops = &xfs_dir3_data_buf_ops;
593 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_DATA_BUF);
594
595 /*
596 * Initialize the header.
597 */
598 hdr = bp->b_addr;
599 if (xfs_sb_version_hascrc(&mp->m_sb)) {
600 struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
601
602 memset(hdr3, 0, sizeof(*hdr3));
603 hdr3->magic = cpu_to_be32(XFS_DIR3_DATA_MAGIC);
604 hdr3->blkno = cpu_to_be64(bp->b_bn);
605 hdr3->owner = cpu_to_be64(dp->i_ino);
606 uuid_copy(&hdr3->uuid, &mp->m_sb.sb_uuid);
607
608 } else
609 hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC);
610
611 bf = dp->d_ops->data_bestfree_p(hdr);
612 bf[0].offset = cpu_to_be16(dp->d_ops->data_entry_offset);
613 for (i = 1; i < XFS_DIR2_DATA_FD_COUNT; i++) {
614 bf[i].length = 0;
615 bf[i].offset = 0;
616 }
617
618 /*
619 * Set up an unused entry for the block's body.
620 */
621 dup = dp->d_ops->data_unused_p(hdr);
622 dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
623
624 t = mp->m_dirblksize - (uint)dp->d_ops->data_entry_offset;
625 bf[0].length = cpu_to_be16(t);
626 dup->length = cpu_to_be16(t);
627 *xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16((char *)dup - (char *)hdr);
628 /*
629 * Log it and return it.
630 */
631 xfs_dir2_data_log_header(tp, dp, bp);
632 xfs_dir2_data_log_unused(tp, bp, dup);
633 *bpp = bp;
634 return 0;
635 }
636
637 /*
638 * Log an active data entry from the block.
639 */
640 void
641 xfs_dir2_data_log_entry(
642 struct xfs_trans *tp,
643 struct xfs_inode *dp,
644 struct xfs_buf *bp,
645 xfs_dir2_data_entry_t *dep) /* data entry pointer */
646 {
647 struct xfs_dir2_data_hdr *hdr = bp->b_addr;
648
649 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
650 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
651 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
652 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
653
654 xfs_trans_log_buf(tp, bp, (uint)((char *)dep - (char *)hdr),
655 (uint)((char *)(dp->d_ops->data_entry_tag_p(dep) + 1) -
656 (char *)hdr - 1));
657 }
658
659 /*
660 * Log a data block header.
661 */
662 void
663 xfs_dir2_data_log_header(
664 struct xfs_trans *tp,
665 struct xfs_inode *dp,
666 struct xfs_buf *bp)
667 {
668 #ifdef DEBUG
669 struct xfs_dir2_data_hdr *hdr = bp->b_addr;
670
671 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
672 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
673 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
674 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
675 #endif
676
677 xfs_trans_log_buf(tp, bp, 0, dp->d_ops->data_entry_offset - 1);
678 }
679
680 /*
681 * Log a data unused entry.
682 */
683 void
684 xfs_dir2_data_log_unused(
685 struct xfs_trans *tp,
686 struct xfs_buf *bp,
687 xfs_dir2_data_unused_t *dup) /* data unused pointer */
688 {
689 xfs_dir2_data_hdr_t *hdr = bp->b_addr;
690
691 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
692 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
693 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
694 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
695
696 /*
697 * Log the first part of the unused entry.
698 */
699 xfs_trans_log_buf(tp, bp, (uint)((char *)dup - (char *)hdr),
700 (uint)((char *)&dup->length + sizeof(dup->length) -
701 1 - (char *)hdr));
702 /*
703 * Log the end (tag) of the unused entry.
704 */
705 xfs_trans_log_buf(tp, bp,
706 (uint)((char *)xfs_dir2_data_unused_tag_p(dup) - (char *)hdr),
707 (uint)((char *)xfs_dir2_data_unused_tag_p(dup) - (char *)hdr +
708 sizeof(xfs_dir2_data_off_t) - 1));
709 }
710
711 /*
712 * Make a byte range in the data block unused.
713 * Its current contents are unimportant.
714 */
715 void
716 xfs_dir2_data_make_free(
717 struct xfs_trans *tp,
718 struct xfs_inode *dp,
719 struct xfs_buf *bp,
720 xfs_dir2_data_aoff_t offset, /* starting byte offset */
721 xfs_dir2_data_aoff_t len, /* length in bytes */
722 int *needlogp, /* out: log header */
723 int *needscanp) /* out: regen bestfree */
724 {
725 xfs_dir2_data_hdr_t *hdr; /* data block pointer */
726 xfs_dir2_data_free_t *dfp; /* bestfree pointer */
727 char *endptr; /* end of data area */
728 xfs_mount_t *mp; /* filesystem mount point */
729 int needscan; /* need to regen bestfree */
730 xfs_dir2_data_unused_t *newdup; /* new unused entry */
731 xfs_dir2_data_unused_t *postdup; /* unused entry after us */
732 xfs_dir2_data_unused_t *prevdup; /* unused entry before us */
733 struct xfs_dir2_data_free *bf;
734
735 mp = tp->t_mountp;
736 hdr = bp->b_addr;
737
738 /*
739 * Figure out where the end of the data area is.
740 */
741 if (hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
742 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC))
743 endptr = (char *)hdr + mp->m_dirblksize;
744 else {
745 xfs_dir2_block_tail_t *btp; /* block tail */
746
747 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
748 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
749 btp = xfs_dir2_block_tail_p(mp, hdr);
750 endptr = (char *)xfs_dir2_block_leaf_p(btp);
751 }
752 /*
753 * If this isn't the start of the block, then back up to
754 * the previous entry and see if it's free.
755 */
756 if (offset > dp->d_ops->data_entry_offset) {
757 __be16 *tagp; /* tag just before us */
758
759 tagp = (__be16 *)((char *)hdr + offset) - 1;
760 prevdup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp));
761 if (be16_to_cpu(prevdup->freetag) != XFS_DIR2_DATA_FREE_TAG)
762 prevdup = NULL;
763 } else
764 prevdup = NULL;
765 /*
766 * If this isn't the end of the block, see if the entry after
767 * us is free.
768 */
769 if ((char *)hdr + offset + len < endptr) {
770 postdup =
771 (xfs_dir2_data_unused_t *)((char *)hdr + offset + len);
772 if (be16_to_cpu(postdup->freetag) != XFS_DIR2_DATA_FREE_TAG)
773 postdup = NULL;
774 } else
775 postdup = NULL;
776 ASSERT(*needscanp == 0);
777 needscan = 0;
778 /*
779 * Previous and following entries are both free,
780 * merge everything into a single free entry.
781 */
782 bf = dp->d_ops->data_bestfree_p(hdr);
783 if (prevdup && postdup) {
784 xfs_dir2_data_free_t *dfp2; /* another bestfree pointer */
785
786 /*
787 * See if prevdup and/or postdup are in bestfree table.
788 */
789 dfp = xfs_dir2_data_freefind(hdr, bf, prevdup);
790 dfp2 = xfs_dir2_data_freefind(hdr, bf, postdup);
791 /*
792 * We need a rescan unless there are exactly 2 free entries
793 * namely our two. Then we know what's happening, otherwise
794 * since the third bestfree is there, there might be more
795 * entries.
796 */
797 needscan = (bf[2].length != 0);
798 /*
799 * Fix up the new big freespace.
800 */
801 be16_add_cpu(&prevdup->length, len + be16_to_cpu(postdup->length));
802 *xfs_dir2_data_unused_tag_p(prevdup) =
803 cpu_to_be16((char *)prevdup - (char *)hdr);
804 xfs_dir2_data_log_unused(tp, bp, prevdup);
805 if (!needscan) {
806 /*
807 * Has to be the case that entries 0 and 1 are
808 * dfp and dfp2 (don't know which is which), and
809 * entry 2 is empty.
810 * Remove entry 1 first then entry 0.
811 */
812 ASSERT(dfp && dfp2);
813 if (dfp == &bf[1]) {
814 dfp = &bf[0];
815 ASSERT(dfp2 == dfp);
816 dfp2 = &bf[1];
817 }
818 xfs_dir2_data_freeremove(hdr, bf, dfp2, needlogp);
819 xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
820 /*
821 * Now insert the new entry.
822 */
823 dfp = xfs_dir2_data_freeinsert(hdr, bf, prevdup,
824 needlogp);
825 ASSERT(dfp == &bf[0]);
826 ASSERT(dfp->length == prevdup->length);
827 ASSERT(!dfp[1].length);
828 ASSERT(!dfp[2].length);
829 }
830 }
831 /*
832 * The entry before us is free, merge with it.
833 */
834 else if (prevdup) {
835 dfp = xfs_dir2_data_freefind(hdr, bf, prevdup);
836 be16_add_cpu(&prevdup->length, len);
837 *xfs_dir2_data_unused_tag_p(prevdup) =
838 cpu_to_be16((char *)prevdup - (char *)hdr);
839 xfs_dir2_data_log_unused(tp, bp, prevdup);
840 /*
841 * If the previous entry was in the table, the new entry
842 * is longer, so it will be in the table too. Remove
843 * the old one and add the new one.
844 */
845 if (dfp) {
846 xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
847 xfs_dir2_data_freeinsert(hdr, bf, prevdup, needlogp);
848 }
849 /*
850 * Otherwise we need a scan if the new entry is big enough.
851 */
852 else {
853 needscan = be16_to_cpu(prevdup->length) >
854 be16_to_cpu(bf[2].length);
855 }
856 }
857 /*
858 * The following entry is free, merge with it.
859 */
860 else if (postdup) {
861 dfp = xfs_dir2_data_freefind(hdr, bf, postdup);
862 newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset);
863 newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
864 newdup->length = cpu_to_be16(len + be16_to_cpu(postdup->length));
865 *xfs_dir2_data_unused_tag_p(newdup) =
866 cpu_to_be16((char *)newdup - (char *)hdr);
867 xfs_dir2_data_log_unused(tp, bp, newdup);
868 /*
869 * If the following entry was in the table, the new entry
870 * is longer, so it will be in the table too. Remove
871 * the old one and add the new one.
872 */
873 if (dfp) {
874 xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
875 xfs_dir2_data_freeinsert(hdr, bf, newdup, needlogp);
876 }
877 /*
878 * Otherwise we need a scan if the new entry is big enough.
879 */
880 else {
881 needscan = be16_to_cpu(newdup->length) >
882 be16_to_cpu(bf[2].length);
883 }
884 }
885 /*
886 * Neither neighbor is free. Make a new entry.
887 */
888 else {
889 newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset);
890 newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
891 newdup->length = cpu_to_be16(len);
892 *xfs_dir2_data_unused_tag_p(newdup) =
893 cpu_to_be16((char *)newdup - (char *)hdr);
894 xfs_dir2_data_log_unused(tp, bp, newdup);
895 xfs_dir2_data_freeinsert(hdr, bf, newdup, needlogp);
896 }
897 *needscanp = needscan;
898 }
899
900 /*
901 * Take a byte range out of an existing unused space and make it un-free.
902 */
903 void
904 xfs_dir2_data_use_free(
905 struct xfs_trans *tp,
906 struct xfs_inode *dp,
907 struct xfs_buf *bp,
908 xfs_dir2_data_unused_t *dup, /* unused entry */
909 xfs_dir2_data_aoff_t offset, /* starting offset to use */
910 xfs_dir2_data_aoff_t len, /* length to use */
911 int *needlogp, /* out: need to log header */
912 int *needscanp) /* out: need regen bestfree */
913 {
914 xfs_dir2_data_hdr_t *hdr; /* data block header */
915 xfs_dir2_data_free_t *dfp; /* bestfree pointer */
916 int matchback; /* matches end of freespace */
917 int matchfront; /* matches start of freespace */
918 int needscan; /* need to regen bestfree */
919 xfs_dir2_data_unused_t *newdup; /* new unused entry */
920 xfs_dir2_data_unused_t *newdup2; /* another new unused entry */
921 int oldlen; /* old unused entry's length */
922 struct xfs_dir2_data_free *bf;
923
924 hdr = bp->b_addr;
925 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
926 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
927 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
928 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
929 ASSERT(be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG);
930 ASSERT(offset >= (char *)dup - (char *)hdr);
931 ASSERT(offset + len <= (char *)dup + be16_to_cpu(dup->length) - (char *)hdr);
932 ASSERT((char *)dup - (char *)hdr == be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)));
933 /*
934 * Look up the entry in the bestfree table.
935 */
936 oldlen = be16_to_cpu(dup->length);
937 bf = dp->d_ops->data_bestfree_p(hdr);
938 dfp = xfs_dir2_data_freefind(hdr, bf, dup);
939 ASSERT(dfp || oldlen <= be16_to_cpu(bf[2].length));
940 /*
941 * Check for alignment with front and back of the entry.
942 */
943 matchfront = (char *)dup - (char *)hdr == offset;
944 matchback = (char *)dup + oldlen - (char *)hdr == offset + len;
945 ASSERT(*needscanp == 0);
946 needscan = 0;
947 /*
948 * If we matched it exactly we just need to get rid of it from
949 * the bestfree table.
950 */
951 if (matchfront && matchback) {
952 if (dfp) {
953 needscan = (bf[2].offset != 0);
954 if (!needscan)
955 xfs_dir2_data_freeremove(hdr, bf, dfp,
956 needlogp);
957 }
958 }
959 /*
960 * We match the first part of the entry.
961 * Make a new entry with the remaining freespace.
962 */
963 else if (matchfront) {
964 newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset + len);
965 newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
966 newdup->length = cpu_to_be16(oldlen - len);
967 *xfs_dir2_data_unused_tag_p(newdup) =
968 cpu_to_be16((char *)newdup - (char *)hdr);
969 xfs_dir2_data_log_unused(tp, bp, newdup);
970 /*
971 * If it was in the table, remove it and add the new one.
972 */
973 if (dfp) {
974 xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
975 dfp = xfs_dir2_data_freeinsert(hdr, bf, newdup,
976 needlogp);
977 ASSERT(dfp != NULL);
978 ASSERT(dfp->length == newdup->length);
979 ASSERT(be16_to_cpu(dfp->offset) == (char *)newdup - (char *)hdr);
980 /*
981 * If we got inserted at the last slot,
982 * that means we don't know if there was a better
983 * choice for the last slot, or not. Rescan.
984 */
985 needscan = dfp == &bf[2];
986 }
987 }
988 /*
989 * We match the last part of the entry.
990 * Trim the allocated space off the tail of the entry.
991 */
992 else if (matchback) {
993 newdup = dup;
994 newdup->length = cpu_to_be16(((char *)hdr + offset) - (char *)newdup);
995 *xfs_dir2_data_unused_tag_p(newdup) =
996 cpu_to_be16((char *)newdup - (char *)hdr);
997 xfs_dir2_data_log_unused(tp, bp, newdup);
998 /*
999 * If it was in the table, remove it and add the new one.
1000 */
1001 if (dfp) {
1002 xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
1003 dfp = xfs_dir2_data_freeinsert(hdr, bf, newdup,
1004 needlogp);
1005 ASSERT(dfp != NULL);
1006 ASSERT(dfp->length == newdup->length);
1007 ASSERT(be16_to_cpu(dfp->offset) == (char *)newdup - (char *)hdr);
1008 /*
1009 * If we got inserted at the last slot,
1010 * that means we don't know if there was a better
1011 * choice for the last slot, or not. Rescan.
1012 */
1013 needscan = dfp == &bf[2];
1014 }
1015 }
1016 /*
1017 * Poking out the middle of an entry.
1018 * Make two new entries.
1019 */
1020 else {
1021 newdup = dup;
1022 newdup->length = cpu_to_be16(((char *)hdr + offset) - (char *)newdup);
1023 *xfs_dir2_data_unused_tag_p(newdup) =
1024 cpu_to_be16((char *)newdup - (char *)hdr);
1025 xfs_dir2_data_log_unused(tp, bp, newdup);
1026 newdup2 = (xfs_dir2_data_unused_t *)((char *)hdr + offset + len);
1027 newdup2->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
1028 newdup2->length = cpu_to_be16(oldlen - len - be16_to_cpu(newdup->length));
1029 *xfs_dir2_data_unused_tag_p(newdup2) =
1030 cpu_to_be16((char *)newdup2 - (char *)hdr);
1031 xfs_dir2_data_log_unused(tp, bp, newdup2);
1032 /*
1033 * If the old entry was in the table, we need to scan
1034 * if the 3rd entry was valid, since these entries
1035 * are smaller than the old one.
1036 * If we don't need to scan that means there were 1 or 2
1037 * entries in the table, and removing the old and adding
1038 * the 2 new will work.
1039 */
1040 if (dfp) {
1041 needscan = (bf[2].length != 0);
1042 if (!needscan) {
1043 xfs_dir2_data_freeremove(hdr, bf, dfp,
1044 needlogp);
1045 xfs_dir2_data_freeinsert(hdr, bf, newdup,
1046 needlogp);
1047 xfs_dir2_data_freeinsert(hdr, bf, newdup2,
1048 needlogp);
1049 }
1050 }
1051 }
1052 *needscanp = needscan;
1053 }
Linux with added FPC-III support