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Linux v2.6.13
[linux-2.6/next.git] / fs / xfs / xfs_dir2.c
blob49fc0a3695ae49311cd456acb92cc66707059933
1 /*
2 * Copyright (c) 2000-2001 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32
33 /*
34 * XFS v2 directory implmentation.
35 * Top-level and utility routines.
36 */
37
38 #include "xfs.h"
39
40 #include "xfs_macros.h"
41 #include "xfs_types.h"
42 #include "xfs_inum.h"
43 #include "xfs_log.h"
44 #include "xfs_trans.h"
45 #include "xfs_sb.h"
46 #include "xfs_ag.h"
47 #include "xfs_dir.h"
48 #include "xfs_dir2.h"
49 #include "xfs_dmapi.h"
50 #include "xfs_mount.h"
51 #include "xfs_alloc_btree.h"
52 #include "xfs_bmap_btree.h"
53 #include "xfs_attr_sf.h"
54 #include "xfs_dir_sf.h"
55 #include "xfs_dir2_sf.h"
56 #include "xfs_dinode.h"
57 #include "xfs_inode_item.h"
58 #include "xfs_inode.h"
59 #include "xfs_bmap.h"
60 #include "xfs_da_btree.h"
61 #include "xfs_dir_leaf.h"
62 #include "xfs_dir2_data.h"
63 #include "xfs_dir2_leaf.h"
64 #include "xfs_dir2_block.h"
65 #include "xfs_dir2_node.h"
66 #include "xfs_dir2_trace.h"
67 #include "xfs_error.h"
68 #include "xfs_bit.h"
69
70 /*
71 * Declarations for interface routines.
72 */
73 static void xfs_dir2_mount(xfs_mount_t *mp);
74 static int xfs_dir2_isempty(xfs_inode_t *dp);
75 static int xfs_dir2_init(xfs_trans_t *tp, xfs_inode_t *dp,
76 xfs_inode_t *pdp);
77 static int xfs_dir2_createname(xfs_trans_t *tp, xfs_inode_t *dp,
78 char *name, int namelen, xfs_ino_t inum,
79 xfs_fsblock_t *first,
80 xfs_bmap_free_t *flist, xfs_extlen_t total);
81 static int xfs_dir2_lookup(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
82 int namelen, xfs_ino_t *inum);
83 static int xfs_dir2_removename(xfs_trans_t *tp, xfs_inode_t *dp,
84 char *name, int namelen, xfs_ino_t ino,
85 xfs_fsblock_t *first,
86 xfs_bmap_free_t *flist, xfs_extlen_t total);
87 static int xfs_dir2_getdents(xfs_trans_t *tp, xfs_inode_t *dp, uio_t *uio,
88 int *eofp);
89 static int xfs_dir2_replace(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
90 int namelen, xfs_ino_t inum,
91 xfs_fsblock_t *first, xfs_bmap_free_t *flist,
92 xfs_extlen_t total);
93 static int xfs_dir2_canenter(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
94 int namelen);
95 static int xfs_dir2_shortform_validate_ondisk(xfs_mount_t *mp,
96 xfs_dinode_t *dip);
97
98 /*
99 * Utility routine declarations.
100 */
101 static int xfs_dir2_put_dirent64_direct(xfs_dir2_put_args_t *pa);
102 static int xfs_dir2_put_dirent64_uio(xfs_dir2_put_args_t *pa);
103
104 /*
105 * Directory operations vector.
106 */
107 xfs_dirops_t xfsv2_dirops = {
108 .xd_mount = xfs_dir2_mount,
109 .xd_isempty = xfs_dir2_isempty,
110 .xd_init = xfs_dir2_init,
111 .xd_createname = xfs_dir2_createname,
112 .xd_lookup = xfs_dir2_lookup,
113 .xd_removename = xfs_dir2_removename,
114 .xd_getdents = xfs_dir2_getdents,
115 .xd_replace = xfs_dir2_replace,
116 .xd_canenter = xfs_dir2_canenter,
117 .xd_shortform_validate_ondisk = xfs_dir2_shortform_validate_ondisk,
118 .xd_shortform_to_single = xfs_dir2_sf_to_block,
119 };
120
121 /*
122 * Interface routines.
123 */
124
125 /*
126 * Initialize directory-related fields in the mount structure.
127 */
128 static void
129 xfs_dir2_mount(
130 xfs_mount_t *mp) /* filesystem mount point */
131 {
132 mp->m_dirversion = 2;
133 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
134 XFS_MAX_BLOCKSIZE);
135 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
136 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
137 mp->m_dirdatablk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_DATA_FIRSTDB(mp));
138 mp->m_dirleafblk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
139 mp->m_dirfreeblk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_FREE_FIRSTDB(mp));
140 mp->m_attr_node_ents =
141 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
142 (uint)sizeof(xfs_da_node_entry_t);
143 mp->m_dir_node_ents =
144 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
145 (uint)sizeof(xfs_da_node_entry_t);
146 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
147 }
148
149 /*
150 * Return 1 if directory contains only "." and "..".
151 */
152 static int /* return code */
153 xfs_dir2_isempty(
154 xfs_inode_t *dp) /* incore inode structure */
155 {
156 xfs_dir2_sf_t *sfp; /* shortform directory structure */
157
158 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
159 /*
160 * Might happen during shutdown.
161 */
162 if (dp->i_d.di_size == 0) {
163 return 1;
164 }
165 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
166 return 0;
167 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
168 return !sfp->hdr.count;
169 }
170
171 /*
172 * Initialize a directory with its "." and ".." entries.
173 */
174 static int /* error */
175 xfs_dir2_init(
176 xfs_trans_t *tp, /* transaction pointer */
177 xfs_inode_t *dp, /* incore directory inode */
178 xfs_inode_t *pdp) /* incore parent directory inode */
179 {
180 xfs_da_args_t args; /* operation arguments */
181 int error; /* error return value */
182
183 memset((char *)&args, 0, sizeof(args));
184 args.dp = dp;
185 args.trans = tp;
186 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
187 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino))) {
188 return error;
189 }
190 return xfs_dir2_sf_create(&args, pdp->i_ino);
191 }
192
193 /*
194 Enter a name in a directory.
195 */
196 static int /* error */
197 xfs_dir2_createname(
198 xfs_trans_t *tp, /* transaction pointer */
199 xfs_inode_t *dp, /* incore directory inode */
200 char *name, /* new entry name */
201 int namelen, /* new entry name length */
202 xfs_ino_t inum, /* new entry inode number */
203 xfs_fsblock_t *first, /* bmap's firstblock */
204 xfs_bmap_free_t *flist, /* bmap's freeblock list */
205 xfs_extlen_t total) /* bmap's total block count */
206 {
207 xfs_da_args_t args; /* operation arguments */
208 int rval; /* return value */
209 int v; /* type-checking value */
210
211 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
212 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum))) {
213 return rval;
214 }
215 XFS_STATS_INC(xs_dir_create);
216 /*
217 * Fill in the arg structure for this request.
218 */
219 args.name = name;
220 args.namelen = namelen;
221 args.hashval = xfs_da_hashname(name, namelen);
222 args.inumber = inum;
223 args.dp = dp;
224 args.firstblock = first;
225 args.flist = flist;
226 args.total = total;
227 args.whichfork = XFS_DATA_FORK;
228 args.trans = tp;
229 args.justcheck = 0;
230 args.addname = args.oknoent = 1;
231 /*
232 * Decide on what work routines to call based on the inode size.
233 */
234 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
235 rval = xfs_dir2_sf_addname(&args);
236 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
237 return rval;
238 } else if (v)
239 rval = xfs_dir2_block_addname(&args);
240 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
241 return rval;
242 } else if (v)
243 rval = xfs_dir2_leaf_addname(&args);
244 else
245 rval = xfs_dir2_node_addname(&args);
246 return rval;
247 }
248
249 /*
250 * Lookup a name in a directory, give back the inode number.
251 */
252 static int /* error */
253 xfs_dir2_lookup(
254 xfs_trans_t *tp, /* transaction pointer */
255 xfs_inode_t *dp, /* incore directory inode */
256 char *name, /* lookup name */
257 int namelen, /* lookup name length */
258 xfs_ino_t *inum) /* out: inode number */
259 {
260 xfs_da_args_t args; /* operation arguments */
261 int rval; /* return value */
262 int v; /* type-checking value */
263
264 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
265 XFS_STATS_INC(xs_dir_lookup);
266
267 /*
268 * Fill in the arg structure for this request.
269 */
270 args.name = name;
271 args.namelen = namelen;
272 args.hashval = xfs_da_hashname(name, namelen);
273 args.inumber = 0;
274 args.dp = dp;
275 args.firstblock = NULL;
276 args.flist = NULL;
277 args.total = 0;
278 args.whichfork = XFS_DATA_FORK;
279 args.trans = tp;
280 args.justcheck = args.addname = 0;
281 args.oknoent = 1;
282 /*
283 * Decide on what work routines to call based on the inode size.
284 */
285 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
286 rval = xfs_dir2_sf_lookup(&args);
287 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
288 return rval;
289 } else if (v)
290 rval = xfs_dir2_block_lookup(&args);
291 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
292 return rval;
293 } else if (v)
294 rval = xfs_dir2_leaf_lookup(&args);
295 else
296 rval = xfs_dir2_node_lookup(&args);
297 if (rval == EEXIST)
298 rval = 0;
299 if (rval == 0)
300 *inum = args.inumber;
301 return rval;
302 }
303
304 /*
305 * Remove an entry from a directory.
306 */
307 static int /* error */
308 xfs_dir2_removename(
309 xfs_trans_t *tp, /* transaction pointer */
310 xfs_inode_t *dp, /* incore directory inode */
311 char *name, /* name of entry to remove */
312 int namelen, /* name length of entry to remove */
313 xfs_ino_t ino, /* inode number of entry to remove */
314 xfs_fsblock_t *first, /* bmap's firstblock */
315 xfs_bmap_free_t *flist, /* bmap's freeblock list */
316 xfs_extlen_t total) /* bmap's total block count */
317 {
318 xfs_da_args_t args; /* operation arguments */
319 int rval; /* return value */
320 int v; /* type-checking value */
321
322 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
323 XFS_STATS_INC(xs_dir_remove);
324 /*
325 * Fill in the arg structure for this request.
326 */
327 args.name = name;
328 args.namelen = namelen;
329 args.hashval = xfs_da_hashname(name, namelen);
330 args.inumber = ino;
331 args.dp = dp;
332 args.firstblock = first;
333 args.flist = flist;
334 args.total = total;
335 args.whichfork = XFS_DATA_FORK;
336 args.trans = tp;
337 args.justcheck = args.addname = args.oknoent = 0;
338 /*
339 * Decide on what work routines to call based on the inode size.
340 */
341 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
342 rval = xfs_dir2_sf_removename(&args);
343 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
344 return rval;
345 } else if (v)
346 rval = xfs_dir2_block_removename(&args);
347 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
348 return rval;
349 } else if (v)
350 rval = xfs_dir2_leaf_removename(&args);
351 else
352 rval = xfs_dir2_node_removename(&args);
353 return rval;
354 }
355
356 /*
357 * Read a directory.
358 */
359 static int /* error */
360 xfs_dir2_getdents(
361 xfs_trans_t *tp, /* transaction pointer */
362 xfs_inode_t *dp, /* incore directory inode */
363 uio_t *uio, /* caller's buffer control */
364 int *eofp) /* out: eof reached */
365 {
366 int alignment; /* alignment required for ABI */
367 xfs_dirent_t *dbp; /* malloc'ed buffer */
368 xfs_dir2_put_t put; /* entry formatting routine */
369 int rval; /* return value */
370 int v; /* type-checking value */
371
372 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
373 XFS_STATS_INC(xs_dir_getdents);
374 /*
375 * If our caller has given us a single contiguous aligned memory buffer,
376 * just work directly within that buffer. If it's in user memory,
377 * lock it down first.
378 */
379 alignment = sizeof(xfs_off_t) - 1;
380 if ((uio->uio_iovcnt == 1) &&
381 (((__psint_t)uio->uio_iov[0].iov_base & alignment) == 0) &&
382 ((uio->uio_iov[0].iov_len & alignment) == 0)) {
383 dbp = NULL;
384 put = xfs_dir2_put_dirent64_direct;
385 } else {
386 dbp = kmem_alloc(sizeof(*dbp) + MAXNAMELEN, KM_SLEEP);
387 put = xfs_dir2_put_dirent64_uio;
388 }
389
390 *eofp = 0;
391 /*
392 * Decide on what work routines to call based on the inode size.
393 */
394 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
395 rval = xfs_dir2_sf_getdents(dp, uio, eofp, dbp, put);
396 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
397 ;
398 } else if (v)
399 rval = xfs_dir2_block_getdents(tp, dp, uio, eofp, dbp, put);
400 else
401 rval = xfs_dir2_leaf_getdents(tp, dp, uio, eofp, dbp, put);
402 if (dbp != NULL)
403 kmem_free(dbp, sizeof(*dbp) + MAXNAMELEN);
404 return rval;
405 }
406
407 /*
408 * Replace the inode number of a directory entry.
409 */
410 static int /* error */
411 xfs_dir2_replace(
412 xfs_trans_t *tp, /* transaction pointer */
413 xfs_inode_t *dp, /* incore directory inode */
414 char *name, /* name of entry to replace */
415 int namelen, /* name length of entry to replace */
416 xfs_ino_t inum, /* new inode number */
417 xfs_fsblock_t *first, /* bmap's firstblock */
418 xfs_bmap_free_t *flist, /* bmap's freeblock list */
419 xfs_extlen_t total) /* bmap's total block count */
420 {
421 xfs_da_args_t args; /* operation arguments */
422 int rval; /* return value */
423 int v; /* type-checking value */
424
425 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
426
427 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum))) {
428 return rval;
429 }
430 /*
431 * Fill in the arg structure for this request.
432 */
433 args.name = name;
434 args.namelen = namelen;
435 args.hashval = xfs_da_hashname(name, namelen);
436 args.inumber = inum;
437 args.dp = dp;
438 args.firstblock = first;
439 args.flist = flist;
440 args.total = total;
441 args.whichfork = XFS_DATA_FORK;
442 args.trans = tp;
443 args.justcheck = args.addname = args.oknoent = 0;
444 /*
445 * Decide on what work routines to call based on the inode size.
446 */
447 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
448 rval = xfs_dir2_sf_replace(&args);
449 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
450 return rval;
451 } else if (v)
452 rval = xfs_dir2_block_replace(&args);
453 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
454 return rval;
455 } else if (v)
456 rval = xfs_dir2_leaf_replace(&args);
457 else
458 rval = xfs_dir2_node_replace(&args);
459 return rval;
460 }
461
462 /*
463 * See if this entry can be added to the directory without allocating space.
464 */
465 static int /* error */
466 xfs_dir2_canenter(
467 xfs_trans_t *tp, /* transaction pointer */
468 xfs_inode_t *dp, /* incore directory inode */
469 char *name, /* name of entry to add */
470 int namelen) /* name length of entry to add */
471 {
472 xfs_da_args_t args; /* operation arguments */
473 int rval; /* return value */
474 int v; /* type-checking value */
475
476 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
477 /*
478 * Fill in the arg structure for this request.
479 */
480 args.name = name;
481 args.namelen = namelen;
482 args.hashval = xfs_da_hashname(name, namelen);
483 args.inumber = 0;
484 args.dp = dp;
485 args.firstblock = NULL;
486 args.flist = NULL;
487 args.total = 0;
488 args.whichfork = XFS_DATA_FORK;
489 args.trans = tp;
490 args.justcheck = args.addname = args.oknoent = 1;
491 /*
492 * Decide on what work routines to call based on the inode size.
493 */
494 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
495 rval = xfs_dir2_sf_addname(&args);
496 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
497 return rval;
498 } else if (v)
499 rval = xfs_dir2_block_addname(&args);
500 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
501 return rval;
502 } else if (v)
503 rval = xfs_dir2_leaf_addname(&args);
504 else
505 rval = xfs_dir2_node_addname(&args);
506 return rval;
507 }
508
509 /*
510 * Dummy routine for shortform inode validation.
511 * Can't really do this.
512 */
513 /* ARGSUSED */
514 static int /* error */
515 xfs_dir2_shortform_validate_ondisk(
516 xfs_mount_t *mp, /* filesystem mount point */
517 xfs_dinode_t *dip) /* ondisk inode */
518 {
519 return 0;
520 }
521
522 /*
523 * Utility routines.
524 */
525
526 /*
527 * Add a block to the directory.
528 * This routine is for data and free blocks, not leaf/node blocks
529 * which are handled by xfs_da_grow_inode.
530 */
531 int /* error */
532 xfs_dir2_grow_inode(
533 xfs_da_args_t *args, /* operation arguments */
534 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
535 xfs_dir2_db_t *dbp) /* out: block number added */
536 {
537 xfs_fileoff_t bno; /* directory offset of new block */
538 int count; /* count of filesystem blocks */
539 xfs_inode_t *dp; /* incore directory inode */
540 int error; /* error return value */
541 int got; /* blocks actually mapped */
542 int i; /* temp mapping index */
543 xfs_bmbt_irec_t map; /* single structure for bmap */
544 int mapi; /* mapping index */
545 xfs_bmbt_irec_t *mapp; /* bmap mapping structure(s) */
546 xfs_mount_t *mp; /* filesystem mount point */
547 int nmap; /* number of bmap entries */
548 xfs_trans_t *tp; /* transaction pointer */
549
550 xfs_dir2_trace_args_s("grow_inode", args, space);
551 dp = args->dp;
552 tp = args->trans;
553 mp = dp->i_mount;
554 /*
555 * Set lowest possible block in the space requested.
556 */
557 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
558 count = mp->m_dirblkfsbs;
559 /*
560 * Find the first hole for our block.
561 */
562 if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK))) {
563 return error;
564 }
565 nmap = 1;
566 ASSERT(args->firstblock != NULL);
567 /*
568 * Try mapping the new block contiguously (one extent).
569 */
570 if ((error = xfs_bmapi(tp, dp, bno, count,
571 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
572 args->firstblock, args->total, &map, &nmap,
573 args->flist))) {
574 return error;
575 }
576 ASSERT(nmap <= 1);
577 /*
578 * Got it in 1.
579 */
580 if (nmap == 1) {
581 mapp = &map;
582 mapi = 1;
583 }
584 /*
585 * Didn't work and this is a multiple-fsb directory block.
586 * Try again with contiguous flag turned on.
587 */
588 else if (nmap == 0 && count > 1) {
589 xfs_fileoff_t b; /* current file offset */
590
591 /*
592 * Space for maximum number of mappings.
593 */
594 mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
595 /*
596 * Iterate until we get to the end of our block.
597 */
598 for (b = bno, mapi = 0; b < bno + count; ) {
599 int c; /* current fsb count */
600
601 /*
602 * Can't map more than MAX_NMAP at once.
603 */
604 nmap = MIN(XFS_BMAP_MAX_NMAP, count);
605 c = (int)(bno + count - b);
606 if ((error = xfs_bmapi(tp, dp, b, c,
607 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
608 args->firstblock, args->total,
609 &mapp[mapi], &nmap, args->flist))) {
610 kmem_free(mapp, sizeof(*mapp) * count);
611 return error;
612 }
613 if (nmap < 1)
614 break;
615 /*
616 * Add this bunch into our table, go to the next offset.
617 */
618 mapi += nmap;
619 b = mapp[mapi - 1].br_startoff +
620 mapp[mapi - 1].br_blockcount;
621 }
622 }
623 /*
624 * Didn't work.
625 */
626 else {
627 mapi = 0;
628 mapp = NULL;
629 }
630 /*
631 * See how many fsb's we got.
632 */
633 for (i = 0, got = 0; i < mapi; i++)
634 got += mapp[i].br_blockcount;
635 /*
636 * Didn't get enough fsb's, or the first/last block's are wrong.
637 */
638 if (got != count || mapp[0].br_startoff != bno ||
639 mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
640 bno + count) {
641 if (mapp != &map)
642 kmem_free(mapp, sizeof(*mapp) * count);
643 return XFS_ERROR(ENOSPC);
644 }
645 /*
646 * Done with the temporary mapping table.
647 */
648 if (mapp != &map)
649 kmem_free(mapp, sizeof(*mapp) * count);
650 *dbp = XFS_DIR2_DA_TO_DB(mp, (xfs_dablk_t)bno);
651 /*
652 * Update file's size if this is the data space and it grew.
653 */
654 if (space == XFS_DIR2_DATA_SPACE) {
655 xfs_fsize_t size; /* directory file (data) size */
656
657 size = XFS_FSB_TO_B(mp, bno + count);
658 if (size > dp->i_d.di_size) {
659 dp->i_d.di_size = size;
660 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
661 }
662 }
663 return 0;
664 }
665
666 /*
667 * See if the directory is a single-block form directory.
668 */
669 int /* error */
670 xfs_dir2_isblock(
671 xfs_trans_t *tp, /* transaction pointer */
672 xfs_inode_t *dp, /* incore directory inode */
673 int *vp) /* out: 1 is block, 0 is not block */
674 {
675 xfs_fileoff_t last; /* last file offset */
676 xfs_mount_t *mp; /* filesystem mount point */
677 int rval; /* return value */
678
679 mp = dp->i_mount;
680 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK))) {
681 return rval;
682 }
683 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
684 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
685 *vp = rval;
686 return 0;
687 }
688
689 /*
690 * See if the directory is a single-leaf form directory.
691 */
692 int /* error */
693 xfs_dir2_isleaf(
694 xfs_trans_t *tp, /* transaction pointer */
695 xfs_inode_t *dp, /* incore directory inode */
696 int *vp) /* out: 1 is leaf, 0 is not leaf */
697 {
698 xfs_fileoff_t last; /* last file offset */
699 xfs_mount_t *mp; /* filesystem mount point */
700 int rval; /* return value */
701
702 mp = dp->i_mount;
703 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK))) {
704 return rval;
705 }
706 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
707 return 0;
708 }
709
710 /*
711 * Getdents put routine for 64-bit ABI, direct form.
712 */
713 static int /* error */
714 xfs_dir2_put_dirent64_direct(
715 xfs_dir2_put_args_t *pa) /* argument bundle */
716 {
717 xfs_dirent_t *idbp; /* dirent pointer */
718 iovec_t *iovp; /* io vector */
719 int namelen; /* entry name length */
720 int reclen; /* entry total length */
721 uio_t *uio; /* I/O control */
722
723 namelen = pa->namelen;
724 reclen = DIRENTSIZE(namelen);
725 uio = pa->uio;
726 /*
727 * Won't fit in the remaining space.
728 */
729 if (reclen > uio->uio_resid) {
730 pa->done = 0;
731 return 0;
732 }
733 iovp = uio->uio_iov;
734 idbp = (xfs_dirent_t *)iovp->iov_base;
735 iovp->iov_base = (char *)idbp + reclen;
736 iovp->iov_len -= reclen;
737 uio->uio_resid -= reclen;
738 idbp->d_reclen = reclen;
739 idbp->d_ino = pa->ino;
740 idbp->d_off = pa->cook;
741 idbp->d_name[namelen] = '\0';
742 pa->done = 1;
743 memcpy(idbp->d_name, pa->name, namelen);
744 return 0;
745 }
746
747 /*
748 * Getdents put routine for 64-bit ABI, uio form.
749 */
750 static int /* error */
751 xfs_dir2_put_dirent64_uio(
752 xfs_dir2_put_args_t *pa) /* argument bundle */
753 {
754 xfs_dirent_t *idbp; /* dirent pointer */
755 int namelen; /* entry name length */
756 int reclen; /* entry total length */
757 int rval; /* return value */
758 uio_t *uio; /* I/O control */
759
760 namelen = pa->namelen;
761 reclen = DIRENTSIZE(namelen);
762 uio = pa->uio;
763 /*
764 * Won't fit in the remaining space.
765 */
766 if (reclen > uio->uio_resid) {
767 pa->done = 0;
768 return 0;
769 }
770 idbp = pa->dbp;
771 idbp->d_reclen = reclen;
772 idbp->d_ino = pa->ino;
773 idbp->d_off = pa->cook;
774 idbp->d_name[namelen] = '\0';
775 memcpy(idbp->d_name, pa->name, namelen);
776 rval = uio_read((caddr_t)idbp, reclen, uio);
777 pa->done = (rval == 0);
778 return rval;
779 }
780
781 /*
782 * Remove the given block from the directory.
783 * This routine is used for data and free blocks, leaf/node are done
784 * by xfs_da_shrink_inode.
785 */
786 int
787 xfs_dir2_shrink_inode(
788 xfs_da_args_t *args, /* operation arguments */
789 xfs_dir2_db_t db, /* directory block number */
790 xfs_dabuf_t *bp) /* block's buffer */
791 {
792 xfs_fileoff_t bno; /* directory file offset */
793 xfs_dablk_t da; /* directory file offset */
794 int done; /* bunmap is finished */
795 xfs_inode_t *dp; /* incore directory inode */
796 int error; /* error return value */
797 xfs_mount_t *mp; /* filesystem mount point */
798 xfs_trans_t *tp; /* transaction pointer */
799
800 xfs_dir2_trace_args_db("shrink_inode", args, db, bp);
801 dp = args->dp;
802 mp = dp->i_mount;
803 tp = args->trans;
804 da = XFS_DIR2_DB_TO_DA(mp, db);
805 /*
806 * Unmap the fsblock(s).
807 */
808 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
809 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
810 &done))) {
811 /*
812 * ENOSPC actually can happen if we're in a removename with
813 * no space reservation, and the resulting block removal
814 * would cause a bmap btree split or conversion from extents
815 * to btree. This can only happen for un-fragmented
816 * directory blocks, since you need to be punching out
817 * the middle of an extent.
818 * In this case we need to leave the block in the file,
819 * and not binval it.
820 * So the block has to be in a consistent empty state
821 * and appropriately logged.
822 * We don't free up the buffer, the caller can tell it
823 * hasn't happened since it got an error back.
824 */
825 return error;
826 }
827 ASSERT(done);
828 /*
829 * Invalidate the buffer from the transaction.
830 */
831 xfs_da_binval(tp, bp);
832 /*
833 * If it's not a data block, we're done.
834 */
835 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
836 return 0;
837 /*
838 * If the block isn't the last one in the directory, we're done.
839 */
840 if (dp->i_d.di_size > XFS_DIR2_DB_OFF_TO_BYTE(mp, db + 1, 0))
841 return 0;
842 bno = da;
843 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
844 /*
845 * This can't really happen unless there's kernel corruption.
846 */
847 return error;
848 }
849 if (db == mp->m_dirdatablk)
850 ASSERT(bno == 0);
851 else
852 ASSERT(bno > 0);
853 /*
854 * Set the size to the new last block.
855 */
856 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
857 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
858 return 0;
859 }
linux-next