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[mirror_ubuntu-bionic-kernel.git] / fs / xfs / xfs_dir2.c
1 /*
2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir.h"
28 #include "xfs_dir2.h"
29 #include "xfs_dmapi.h"
30 #include "xfs_mount.h"
31 #include "xfs_da_btree.h"
32 #include "xfs_bmap_btree.h"
33 #include "xfs_alloc_btree.h"
34 #include "xfs_dir_sf.h"
35 #include "xfs_dir2_sf.h"
36 #include "xfs_attr_sf.h"
37 #include "xfs_dinode.h"
38 #include "xfs_inode.h"
39 #include "xfs_inode_item.h"
40 #include "xfs_bmap.h"
41 #include "xfs_dir_leaf.h"
42 #include "xfs_dir2_data.h"
43 #include "xfs_dir2_leaf.h"
44 #include "xfs_dir2_block.h"
45 #include "xfs_dir2_node.h"
46 #include "xfs_dir2_trace.h"
47 #include "xfs_error.h"
48
49 /*
50 * Declarations for interface routines.
51 */
52 static void xfs_dir2_mount(xfs_mount_t *mp);
53 static int xfs_dir2_isempty(xfs_inode_t *dp);
54 static int xfs_dir2_init(xfs_trans_t *tp, xfs_inode_t *dp,
55 xfs_inode_t *pdp);
56 static int xfs_dir2_createname(xfs_trans_t *tp, xfs_inode_t *dp,
57 char *name, int namelen, xfs_ino_t inum,
58 xfs_fsblock_t *first,
59 xfs_bmap_free_t *flist, xfs_extlen_t total);
60 static int xfs_dir2_lookup(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
61 int namelen, xfs_ino_t *inum);
62 static int xfs_dir2_removename(xfs_trans_t *tp, xfs_inode_t *dp,
63 char *name, int namelen, xfs_ino_t ino,
64 xfs_fsblock_t *first,
65 xfs_bmap_free_t *flist, xfs_extlen_t total);
66 static int xfs_dir2_getdents(xfs_trans_t *tp, xfs_inode_t *dp, uio_t *uio,
67 int *eofp);
68 static int xfs_dir2_replace(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
69 int namelen, xfs_ino_t inum,
70 xfs_fsblock_t *first, xfs_bmap_free_t *flist,
71 xfs_extlen_t total);
72 static int xfs_dir2_canenter(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
73 int namelen);
74 static int xfs_dir2_shortform_validate_ondisk(xfs_mount_t *mp,
75 xfs_dinode_t *dip);
76
77 /*
78 * Utility routine declarations.
79 */
80 static int xfs_dir2_put_dirent64_direct(xfs_dir2_put_args_t *pa);
81 static int xfs_dir2_put_dirent64_uio(xfs_dir2_put_args_t *pa);
82
83 /*
84 * Directory operations vector.
85 */
86 xfs_dirops_t xfsv2_dirops = {
87 .xd_mount = xfs_dir2_mount,
88 .xd_isempty = xfs_dir2_isempty,
89 .xd_init = xfs_dir2_init,
90 .xd_createname = xfs_dir2_createname,
91 .xd_lookup = xfs_dir2_lookup,
92 .xd_removename = xfs_dir2_removename,
93 .xd_getdents = xfs_dir2_getdents,
94 .xd_replace = xfs_dir2_replace,
95 .xd_canenter = xfs_dir2_canenter,
96 .xd_shortform_validate_ondisk = xfs_dir2_shortform_validate_ondisk,
97 .xd_shortform_to_single = xfs_dir2_sf_to_block,
98 };
99
100 /*
101 * Interface routines.
102 */
103
104 /*
105 * Initialize directory-related fields in the mount structure.
106 */
107 static void
108 xfs_dir2_mount(
109 xfs_mount_t *mp) /* filesystem mount point */
110 {
111 mp->m_dirversion = 2;
112 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
113 XFS_MAX_BLOCKSIZE);
114 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
115 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
116 mp->m_dirdatablk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_DATA_FIRSTDB(mp));
117 mp->m_dirleafblk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
118 mp->m_dirfreeblk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_FREE_FIRSTDB(mp));
119 mp->m_attr_node_ents =
120 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
121 (uint)sizeof(xfs_da_node_entry_t);
122 mp->m_dir_node_ents =
123 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
124 (uint)sizeof(xfs_da_node_entry_t);
125 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
126 }
127
128 /*
129 * Return 1 if directory contains only "." and "..".
130 */
131 static int /* return code */
132 xfs_dir2_isempty(
133 xfs_inode_t *dp) /* incore inode structure */
134 {
135 xfs_dir2_sf_t *sfp; /* shortform directory structure */
136
137 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
138 /*
139 * Might happen during shutdown.
140 */
141 if (dp->i_d.di_size == 0) {
142 return 1;
143 }
144 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
145 return 0;
146 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
147 return !sfp->hdr.count;
148 }
149
150 /*
151 * Initialize a directory with its "." and ".." entries.
152 */
153 static int /* error */
154 xfs_dir2_init(
155 xfs_trans_t *tp, /* transaction pointer */
156 xfs_inode_t *dp, /* incore directory inode */
157 xfs_inode_t *pdp) /* incore parent directory inode */
158 {
159 xfs_da_args_t args; /* operation arguments */
160 int error; /* error return value */
161
162 memset((char *)&args, 0, sizeof(args));
163 args.dp = dp;
164 args.trans = tp;
165 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
166 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino))) {
167 return error;
168 }
169 return xfs_dir2_sf_create(&args, pdp->i_ino);
170 }
171
172 /*
173 Enter a name in a directory.
174 */
175 static int /* error */
176 xfs_dir2_createname(
177 xfs_trans_t *tp, /* transaction pointer */
178 xfs_inode_t *dp, /* incore directory inode */
179 char *name, /* new entry name */
180 int namelen, /* new entry name length */
181 xfs_ino_t inum, /* new entry inode number */
182 xfs_fsblock_t *first, /* bmap's firstblock */
183 xfs_bmap_free_t *flist, /* bmap's freeblock list */
184 xfs_extlen_t total) /* bmap's total block count */
185 {
186 xfs_da_args_t args; /* operation arguments */
187 int rval; /* return value */
188 int v; /* type-checking value */
189
190 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
191 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum))) {
192 return rval;
193 }
194 XFS_STATS_INC(xs_dir_create);
195 /*
196 * Fill in the arg structure for this request.
197 */
198 args.name = name;
199 args.namelen = namelen;
200 args.hashval = xfs_da_hashname(name, namelen);
201 args.inumber = inum;
202 args.dp = dp;
203 args.firstblock = first;
204 args.flist = flist;
205 args.total = total;
206 args.whichfork = XFS_DATA_FORK;
207 args.trans = tp;
208 args.justcheck = 0;
209 args.addname = args.oknoent = 1;
210 /*
211 * Decide on what work routines to call based on the inode size.
212 */
213 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
214 rval = xfs_dir2_sf_addname(&args);
215 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
216 return rval;
217 } else if (v)
218 rval = xfs_dir2_block_addname(&args);
219 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
220 return rval;
221 } else if (v)
222 rval = xfs_dir2_leaf_addname(&args);
223 else
224 rval = xfs_dir2_node_addname(&args);
225 return rval;
226 }
227
228 /*
229 * Lookup a name in a directory, give back the inode number.
230 */
231 static int /* error */
232 xfs_dir2_lookup(
233 xfs_trans_t *tp, /* transaction pointer */
234 xfs_inode_t *dp, /* incore directory inode */
235 char *name, /* lookup name */
236 int namelen, /* lookup name length */
237 xfs_ino_t *inum) /* out: inode number */
238 {
239 xfs_da_args_t args; /* operation arguments */
240 int rval; /* return value */
241 int v; /* type-checking value */
242
243 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
244 XFS_STATS_INC(xs_dir_lookup);
245
246 /*
247 * Fill in the arg structure for this request.
248 */
249 args.name = name;
250 args.namelen = namelen;
251 args.hashval = xfs_da_hashname(name, namelen);
252 args.inumber = 0;
253 args.dp = dp;
254 args.firstblock = NULL;
255 args.flist = NULL;
256 args.total = 0;
257 args.whichfork = XFS_DATA_FORK;
258 args.trans = tp;
259 args.justcheck = args.addname = 0;
260 args.oknoent = 1;
261 /*
262 * Decide on what work routines to call based on the inode size.
263 */
264 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
265 rval = xfs_dir2_sf_lookup(&args);
266 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
267 return rval;
268 } else if (v)
269 rval = xfs_dir2_block_lookup(&args);
270 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
271 return rval;
272 } else if (v)
273 rval = xfs_dir2_leaf_lookup(&args);
274 else
275 rval = xfs_dir2_node_lookup(&args);
276 if (rval == EEXIST)
277 rval = 0;
278 if (rval == 0)
279 *inum = args.inumber;
280 return rval;
281 }
282
283 /*
284 * Remove an entry from a directory.
285 */
286 static int /* error */
287 xfs_dir2_removename(
288 xfs_trans_t *tp, /* transaction pointer */
289 xfs_inode_t *dp, /* incore directory inode */
290 char *name, /* name of entry to remove */
291 int namelen, /* name length of entry to remove */
292 xfs_ino_t ino, /* inode number of entry to remove */
293 xfs_fsblock_t *first, /* bmap's firstblock */
294 xfs_bmap_free_t *flist, /* bmap's freeblock list */
295 xfs_extlen_t total) /* bmap's total block count */
296 {
297 xfs_da_args_t args; /* operation arguments */
298 int rval; /* return value */
299 int v; /* type-checking value */
300
301 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
302 XFS_STATS_INC(xs_dir_remove);
303 /*
304 * Fill in the arg structure for this request.
305 */
306 args.name = name;
307 args.namelen = namelen;
308 args.hashval = xfs_da_hashname(name, namelen);
309 args.inumber = ino;
310 args.dp = dp;
311 args.firstblock = first;
312 args.flist = flist;
313 args.total = total;
314 args.whichfork = XFS_DATA_FORK;
315 args.trans = tp;
316 args.justcheck = args.addname = args.oknoent = 0;
317 /*
318 * Decide on what work routines to call based on the inode size.
319 */
320 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
321 rval = xfs_dir2_sf_removename(&args);
322 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
323 return rval;
324 } else if (v)
325 rval = xfs_dir2_block_removename(&args);
326 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
327 return rval;
328 } else if (v)
329 rval = xfs_dir2_leaf_removename(&args);
330 else
331 rval = xfs_dir2_node_removename(&args);
332 return rval;
333 }
334
335 /*
336 * Read a directory.
337 */
338 static int /* error */
339 xfs_dir2_getdents(
340 xfs_trans_t *tp, /* transaction pointer */
341 xfs_inode_t *dp, /* incore directory inode */
342 uio_t *uio, /* caller's buffer control */
343 int *eofp) /* out: eof reached */
344 {
345 int alignment; /* alignment required for ABI */
346 xfs_dirent_t *dbp; /* malloc'ed buffer */
347 xfs_dir2_put_t put; /* entry formatting routine */
348 int rval; /* return value */
349 int v; /* type-checking value */
350
351 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
352 XFS_STATS_INC(xs_dir_getdents);
353 /*
354 * If our caller has given us a single contiguous aligned memory buffer,
355 * just work directly within that buffer. If it's in user memory,
356 * lock it down first.
357 */
358 alignment = sizeof(xfs_off_t) - 1;
359 if ((uio->uio_iovcnt == 1) &&
360 (((__psint_t)uio->uio_iov[0].iov_base & alignment) == 0) &&
361 ((uio->uio_iov[0].iov_len & alignment) == 0)) {
362 dbp = NULL;
363 put = xfs_dir2_put_dirent64_direct;
364 } else {
365 dbp = kmem_alloc(sizeof(*dbp) + MAXNAMELEN, KM_SLEEP);
366 put = xfs_dir2_put_dirent64_uio;
367 }
368
369 *eofp = 0;
370 /*
371 * Decide on what work routines to call based on the inode size.
372 */
373 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
374 rval = xfs_dir2_sf_getdents(dp, uio, eofp, dbp, put);
375 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
376 ;
377 } else if (v)
378 rval = xfs_dir2_block_getdents(tp, dp, uio, eofp, dbp, put);
379 else
380 rval = xfs_dir2_leaf_getdents(tp, dp, uio, eofp, dbp, put);
381 if (dbp != NULL)
382 kmem_free(dbp, sizeof(*dbp) + MAXNAMELEN);
383 return rval;
384 }
385
386 /*
387 * Replace the inode number of a directory entry.
388 */
389 static int /* error */
390 xfs_dir2_replace(
391 xfs_trans_t *tp, /* transaction pointer */
392 xfs_inode_t *dp, /* incore directory inode */
393 char *name, /* name of entry to replace */
394 int namelen, /* name length of entry to replace */
395 xfs_ino_t inum, /* new inode number */
396 xfs_fsblock_t *first, /* bmap's firstblock */
397 xfs_bmap_free_t *flist, /* bmap's freeblock list */
398 xfs_extlen_t total) /* bmap's total block count */
399 {
400 xfs_da_args_t args; /* operation arguments */
401 int rval; /* return value */
402 int v; /* type-checking value */
403
404 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
405
406 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum))) {
407 return rval;
408 }
409 /*
410 * Fill in the arg structure for this request.
411 */
412 args.name = name;
413 args.namelen = namelen;
414 args.hashval = xfs_da_hashname(name, namelen);
415 args.inumber = inum;
416 args.dp = dp;
417 args.firstblock = first;
418 args.flist = flist;
419 args.total = total;
420 args.whichfork = XFS_DATA_FORK;
421 args.trans = tp;
422 args.justcheck = args.addname = args.oknoent = 0;
423 /*
424 * Decide on what work routines to call based on the inode size.
425 */
426 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
427 rval = xfs_dir2_sf_replace(&args);
428 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
429 return rval;
430 } else if (v)
431 rval = xfs_dir2_block_replace(&args);
432 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
433 return rval;
434 } else if (v)
435 rval = xfs_dir2_leaf_replace(&args);
436 else
437 rval = xfs_dir2_node_replace(&args);
438 return rval;
439 }
440
441 /*
442 * See if this entry can be added to the directory without allocating space.
443 */
444 static int /* error */
445 xfs_dir2_canenter(
446 xfs_trans_t *tp, /* transaction pointer */
447 xfs_inode_t *dp, /* incore directory inode */
448 char *name, /* name of entry to add */
449 int namelen) /* name length of entry to add */
450 {
451 xfs_da_args_t args; /* operation arguments */
452 int rval; /* return value */
453 int v; /* type-checking value */
454
455 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
456 /*
457 * Fill in the arg structure for this request.
458 */
459 args.name = name;
460 args.namelen = namelen;
461 args.hashval = xfs_da_hashname(name, namelen);
462 args.inumber = 0;
463 args.dp = dp;
464 args.firstblock = NULL;
465 args.flist = NULL;
466 args.total = 0;
467 args.whichfork = XFS_DATA_FORK;
468 args.trans = tp;
469 args.justcheck = args.addname = args.oknoent = 1;
470 /*
471 * Decide on what work routines to call based on the inode size.
472 */
473 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
474 rval = xfs_dir2_sf_addname(&args);
475 else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
476 return rval;
477 } else if (v)
478 rval = xfs_dir2_block_addname(&args);
479 else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
480 return rval;
481 } else if (v)
482 rval = xfs_dir2_leaf_addname(&args);
483 else
484 rval = xfs_dir2_node_addname(&args);
485 return rval;
486 }
487
488 /*
489 * Dummy routine for shortform inode validation.
490 * Can't really do this.
491 */
492 /* ARGSUSED */
493 static int /* error */
494 xfs_dir2_shortform_validate_ondisk(
495 xfs_mount_t *mp, /* filesystem mount point */
496 xfs_dinode_t *dip) /* ondisk inode */
497 {
498 return 0;
499 }
500
501 /*
502 * Utility routines.
503 */
504
505 /*
506 * Add a block to the directory.
507 * This routine is for data and free blocks, not leaf/node blocks
508 * which are handled by xfs_da_grow_inode.
509 */
510 int /* error */
511 xfs_dir2_grow_inode(
512 xfs_da_args_t *args, /* operation arguments */
513 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
514 xfs_dir2_db_t *dbp) /* out: block number added */
515 {
516 xfs_fileoff_t bno; /* directory offset of new block */
517 int count; /* count of filesystem blocks */
518 xfs_inode_t *dp; /* incore directory inode */
519 int error; /* error return value */
520 int got; /* blocks actually mapped */
521 int i; /* temp mapping index */
522 xfs_bmbt_irec_t map; /* single structure for bmap */
523 int mapi; /* mapping index */
524 xfs_bmbt_irec_t *mapp; /* bmap mapping structure(s) */
525 xfs_mount_t *mp; /* filesystem mount point */
526 int nmap; /* number of bmap entries */
527 xfs_trans_t *tp; /* transaction pointer */
528
529 xfs_dir2_trace_args_s("grow_inode", args, space);
530 dp = args->dp;
531 tp = args->trans;
532 mp = dp->i_mount;
533 /*
534 * Set lowest possible block in the space requested.
535 */
536 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
537 count = mp->m_dirblkfsbs;
538 /*
539 * Find the first hole for our block.
540 */
541 if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK))) {
542 return error;
543 }
544 nmap = 1;
545 ASSERT(args->firstblock != NULL);
546 /*
547 * Try mapping the new block contiguously (one extent).
548 */
549 if ((error = xfs_bmapi(tp, dp, bno, count,
550 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
551 args->firstblock, args->total, &map, &nmap,
552 args->flist))) {
553 return error;
554 }
555 ASSERT(nmap <= 1);
556 /*
557 * Got it in 1.
558 */
559 if (nmap == 1) {
560 mapp = &map;
561 mapi = 1;
562 }
563 /*
564 * Didn't work and this is a multiple-fsb directory block.
565 * Try again with contiguous flag turned on.
566 */
567 else if (nmap == 0 && count > 1) {
568 xfs_fileoff_t b; /* current file offset */
569
570 /*
571 * Space for maximum number of mappings.
572 */
573 mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
574 /*
575 * Iterate until we get to the end of our block.
576 */
577 for (b = bno, mapi = 0; b < bno + count; ) {
578 int c; /* current fsb count */
579
580 /*
581 * Can't map more than MAX_NMAP at once.
582 */
583 nmap = MIN(XFS_BMAP_MAX_NMAP, count);
584 c = (int)(bno + count - b);
585 if ((error = xfs_bmapi(tp, dp, b, c,
586 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
587 args->firstblock, args->total,
588 &mapp[mapi], &nmap, args->flist))) {
589 kmem_free(mapp, sizeof(*mapp) * count);
590 return error;
591 }
592 if (nmap < 1)
593 break;
594 /*
595 * Add this bunch into our table, go to the next offset.
596 */
597 mapi += nmap;
598 b = mapp[mapi - 1].br_startoff +
599 mapp[mapi - 1].br_blockcount;
600 }
601 }
602 /*
603 * Didn't work.
604 */
605 else {
606 mapi = 0;
607 mapp = NULL;
608 }
609 /*
610 * See how many fsb's we got.
611 */
612 for (i = 0, got = 0; i < mapi; i++)
613 got += mapp[i].br_blockcount;
614 /*
615 * Didn't get enough fsb's, or the first/last block's are wrong.
616 */
617 if (got != count || mapp[0].br_startoff != bno ||
618 mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
619 bno + count) {
620 if (mapp != &map)
621 kmem_free(mapp, sizeof(*mapp) * count);
622 return XFS_ERROR(ENOSPC);
623 }
624 /*
625 * Done with the temporary mapping table.
626 */
627 if (mapp != &map)
628 kmem_free(mapp, sizeof(*mapp) * count);
629 *dbp = XFS_DIR2_DA_TO_DB(mp, (xfs_dablk_t)bno);
630 /*
631 * Update file's size if this is the data space and it grew.
632 */
633 if (space == XFS_DIR2_DATA_SPACE) {
634 xfs_fsize_t size; /* directory file (data) size */
635
636 size = XFS_FSB_TO_B(mp, bno + count);
637 if (size > dp->i_d.di_size) {
638 dp->i_d.di_size = size;
639 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
640 }
641 }
642 return 0;
643 }
644
645 /*
646 * See if the directory is a single-block form directory.
647 */
648 int /* error */
649 xfs_dir2_isblock(
650 xfs_trans_t *tp, /* transaction pointer */
651 xfs_inode_t *dp, /* incore directory inode */
652 int *vp) /* out: 1 is block, 0 is not block */
653 {
654 xfs_fileoff_t last; /* last file offset */
655 xfs_mount_t *mp; /* filesystem mount point */
656 int rval; /* return value */
657
658 mp = dp->i_mount;
659 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK))) {
660 return rval;
661 }
662 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
663 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
664 *vp = rval;
665 return 0;
666 }
667
668 /*
669 * See if the directory is a single-leaf form directory.
670 */
671 int /* error */
672 xfs_dir2_isleaf(
673 xfs_trans_t *tp, /* transaction pointer */
674 xfs_inode_t *dp, /* incore directory inode */
675 int *vp) /* out: 1 is leaf, 0 is not leaf */
676 {
677 xfs_fileoff_t last; /* last file offset */
678 xfs_mount_t *mp; /* filesystem mount point */
679 int rval; /* return value */
680
681 mp = dp->i_mount;
682 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK))) {
683 return rval;
684 }
685 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
686 return 0;
687 }
688
689 /*
690 * Getdents put routine for 64-bit ABI, direct form.
691 */
692 static int /* error */
693 xfs_dir2_put_dirent64_direct(
694 xfs_dir2_put_args_t *pa) /* argument bundle */
695 {
696 xfs_dirent_t *idbp; /* dirent pointer */
697 iovec_t *iovp; /* io vector */
698 int namelen; /* entry name length */
699 int reclen; /* entry total length */
700 uio_t *uio; /* I/O control */
701
702 namelen = pa->namelen;
703 reclen = DIRENTSIZE(namelen);
704 uio = pa->uio;
705 /*
706 * Won't fit in the remaining space.
707 */
708 if (reclen > uio->uio_resid) {
709 pa->done = 0;
710 return 0;
711 }
712 iovp = uio->uio_iov;
713 idbp = (xfs_dirent_t *)iovp->iov_base;
714 iovp->iov_base = (char *)idbp + reclen;
715 iovp->iov_len -= reclen;
716 uio->uio_resid -= reclen;
717 idbp->d_reclen = reclen;
718 idbp->d_ino = pa->ino;
719 idbp->d_off = pa->cook;
720 idbp->d_name[namelen] = '\0';
721 pa->done = 1;
722 memcpy(idbp->d_name, pa->name, namelen);
723 return 0;
724 }
725
726 /*
727 * Getdents put routine for 64-bit ABI, uio form.
728 */
729 static int /* error */
730 xfs_dir2_put_dirent64_uio(
731 xfs_dir2_put_args_t *pa) /* argument bundle */
732 {
733 xfs_dirent_t *idbp; /* dirent pointer */
734 int namelen; /* entry name length */
735 int reclen; /* entry total length */
736 int rval; /* return value */
737 uio_t *uio; /* I/O control */
738
739 namelen = pa->namelen;
740 reclen = DIRENTSIZE(namelen);
741 uio = pa->uio;
742 /*
743 * Won't fit in the remaining space.
744 */
745 if (reclen > uio->uio_resid) {
746 pa->done = 0;
747 return 0;
748 }
749 idbp = pa->dbp;
750 idbp->d_reclen = reclen;
751 idbp->d_ino = pa->ino;
752 idbp->d_off = pa->cook;
753 idbp->d_name[namelen] = '\0';
754 memcpy(idbp->d_name, pa->name, namelen);
755 rval = uio_read((caddr_t)idbp, reclen, uio);
756 pa->done = (rval == 0);
757 return rval;
758 }
759
760 /*
761 * Remove the given block from the directory.
762 * This routine is used for data and free blocks, leaf/node are done
763 * by xfs_da_shrink_inode.
764 */
765 int
766 xfs_dir2_shrink_inode(
767 xfs_da_args_t *args, /* operation arguments */
768 xfs_dir2_db_t db, /* directory block number */
769 xfs_dabuf_t *bp) /* block's buffer */
770 {
771 xfs_fileoff_t bno; /* directory file offset */
772 xfs_dablk_t da; /* directory file offset */
773 int done; /* bunmap is finished */
774 xfs_inode_t *dp; /* incore directory inode */
775 int error; /* error return value */
776 xfs_mount_t *mp; /* filesystem mount point */
777 xfs_trans_t *tp; /* transaction pointer */
778
779 xfs_dir2_trace_args_db("shrink_inode", args, db, bp);
780 dp = args->dp;
781 mp = dp->i_mount;
782 tp = args->trans;
783 da = XFS_DIR2_DB_TO_DA(mp, db);
784 /*
785 * Unmap the fsblock(s).
786 */
787 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
788 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
789 &done))) {
790 /*
791 * ENOSPC actually can happen if we're in a removename with
792 * no space reservation, and the resulting block removal
793 * would cause a bmap btree split or conversion from extents
794 * to btree. This can only happen for un-fragmented
795 * directory blocks, since you need to be punching out
796 * the middle of an extent.
797 * In this case we need to leave the block in the file,
798 * and not binval it.
799 * So the block has to be in a consistent empty state
800 * and appropriately logged.
801 * We don't free up the buffer, the caller can tell it
802 * hasn't happened since it got an error back.
803 */
804 return error;
805 }
806 ASSERT(done);
807 /*
808 * Invalidate the buffer from the transaction.
809 */
810 xfs_da_binval(tp, bp);
811 /*
812 * If it's not a data block, we're done.
813 */
814 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
815 return 0;
816 /*
817 * If the block isn't the last one in the directory, we're done.
818 */
819 if (dp->i_d.di_size > XFS_DIR2_DB_OFF_TO_BYTE(mp, db + 1, 0))
820 return 0;
821 bno = da;
822 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
823 /*
824 * This can't really happen unless there's kernel corruption.
825 */
826 return error;
827 }
828 if (db == mp->m_dirdatablk)
829 ASSERT(bno == 0);
830 else
831 ASSERT(bno > 0);
832 /*
833 * Set the size to the new last block.
834 */
835 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
836 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
837 return 0;
838 }
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