]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. | |
3 | * Copyright (c) 2012-2013 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_shared.h" | |
21 | #include "xfs_fs.h" | |
22 | #include "xfs_format.h" | |
23 | #include "xfs_log_format.h" | |
24 | #include "xfs_trans_resv.h" | |
25 | #include "xfs_bit.h" | |
26 | #include "xfs_mount.h" | |
27 | #include "xfs_da_format.h" | |
28 | #include "xfs_da_btree.h" | |
29 | #include "xfs_dir2.h" | |
30 | #include "xfs_inode.h" | |
31 | #include "xfs_ialloc.h" | |
32 | #include "xfs_alloc.h" | |
33 | #include "xfs_bmap.h" | |
34 | #include "xfs_bmap_btree.h" | |
35 | #include "xfs_bmap_util.h" | |
36 | #include "xfs_error.h" | |
37 | #include "xfs_quota.h" | |
38 | #include "xfs_trans_space.h" | |
39 | #include "xfs_trace.h" | |
40 | #include "xfs_symlink.h" | |
41 | #include "xfs_trans.h" | |
42 | #include "xfs_log.h" | |
43 | ||
44 | /* ----- Kernel only functions below ----- */ | |
45 | STATIC int | |
46 | xfs_readlink_bmap( | |
47 | struct xfs_inode *ip, | |
48 | char *link) | |
49 | { | |
50 | struct xfs_mount *mp = ip->i_mount; | |
51 | struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS]; | |
52 | struct xfs_buf *bp; | |
53 | xfs_daddr_t d; | |
54 | char *cur_chunk; | |
55 | int pathlen = ip->i_d.di_size; | |
56 | int nmaps = XFS_SYMLINK_MAPS; | |
57 | int byte_cnt; | |
58 | int n; | |
59 | int error = 0; | |
60 | int fsblocks = 0; | |
61 | int offset; | |
62 | ||
63 | fsblocks = xfs_symlink_blocks(mp, pathlen); | |
64 | error = xfs_bmapi_read(ip, 0, fsblocks, mval, &nmaps, 0); | |
65 | if (error) | |
66 | goto out; | |
67 | ||
68 | offset = 0; | |
69 | for (n = 0; n < nmaps; n++) { | |
70 | d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); | |
71 | byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); | |
72 | ||
73 | bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0, | |
74 | &xfs_symlink_buf_ops); | |
75 | if (!bp) | |
76 | return -ENOMEM; | |
77 | error = bp->b_error; | |
78 | if (error) { | |
79 | xfs_buf_ioerror_alert(bp, __func__); | |
80 | xfs_buf_relse(bp); | |
81 | ||
82 | /* bad CRC means corrupted metadata */ | |
83 | if (error == -EFSBADCRC) | |
84 | error = -EFSCORRUPTED; | |
85 | goto out; | |
86 | } | |
87 | byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt); | |
88 | if (pathlen < byte_cnt) | |
89 | byte_cnt = pathlen; | |
90 | ||
91 | cur_chunk = bp->b_addr; | |
92 | if (xfs_sb_version_hascrc(&mp->m_sb)) { | |
93 | if (!xfs_symlink_hdr_ok(ip->i_ino, offset, | |
94 | byte_cnt, bp)) { | |
95 | error = -EFSCORRUPTED; | |
96 | xfs_alert(mp, | |
97 | "symlink header does not match required off/len/owner (0x%x/Ox%x,0x%llx)", | |
98 | offset, byte_cnt, ip->i_ino); | |
99 | xfs_buf_relse(bp); | |
100 | goto out; | |
101 | ||
102 | } | |
103 | ||
104 | cur_chunk += sizeof(struct xfs_dsymlink_hdr); | |
105 | } | |
106 | ||
107 | memcpy(link + offset, cur_chunk, byte_cnt); | |
108 | ||
109 | pathlen -= byte_cnt; | |
110 | offset += byte_cnt; | |
111 | ||
112 | xfs_buf_relse(bp); | |
113 | } | |
114 | ASSERT(pathlen == 0); | |
115 | ||
116 | link[ip->i_d.di_size] = '\0'; | |
117 | error = 0; | |
118 | ||
119 | out: | |
120 | return error; | |
121 | } | |
122 | ||
123 | int | |
124 | xfs_readlink( | |
125 | struct xfs_inode *ip, | |
126 | char *link) | |
127 | { | |
128 | struct xfs_mount *mp = ip->i_mount; | |
129 | xfs_fsize_t pathlen; | |
130 | int error = 0; | |
131 | ||
132 | trace_xfs_readlink(ip); | |
133 | ||
134 | if (XFS_FORCED_SHUTDOWN(mp)) | |
135 | return -EIO; | |
136 | ||
137 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
138 | ||
139 | pathlen = ip->i_d.di_size; | |
140 | if (!pathlen) | |
141 | goto out; | |
142 | ||
143 | if (pathlen < 0 || pathlen > MAXPATHLEN) { | |
144 | xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)", | |
145 | __func__, (unsigned long long) ip->i_ino, | |
146 | (long long) pathlen); | |
147 | ASSERT(0); | |
148 | error = -EFSCORRUPTED; | |
149 | goto out; | |
150 | } | |
151 | ||
152 | ||
153 | if (ip->i_df.if_flags & XFS_IFINLINE) { | |
154 | memcpy(link, ip->i_df.if_u1.if_data, pathlen); | |
155 | link[pathlen] = '\0'; | |
156 | } else { | |
157 | error = xfs_readlink_bmap(ip, link); | |
158 | } | |
159 | ||
160 | out: | |
161 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
162 | return error; | |
163 | } | |
164 | ||
165 | int | |
166 | xfs_symlink( | |
167 | struct xfs_inode *dp, | |
168 | struct xfs_name *link_name, | |
169 | const char *target_path, | |
170 | umode_t mode, | |
171 | struct xfs_inode **ipp) | |
172 | { | |
173 | struct xfs_mount *mp = dp->i_mount; | |
174 | struct xfs_trans *tp = NULL; | |
175 | struct xfs_inode *ip = NULL; | |
176 | int error = 0; | |
177 | int pathlen; | |
178 | struct xfs_bmap_free free_list; | |
179 | xfs_fsblock_t first_block; | |
180 | bool unlock_dp_on_error = false; | |
181 | int committed; | |
182 | xfs_fileoff_t first_fsb; | |
183 | xfs_filblks_t fs_blocks; | |
184 | int nmaps; | |
185 | struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS]; | |
186 | xfs_daddr_t d; | |
187 | const char *cur_chunk; | |
188 | int byte_cnt; | |
189 | int n; | |
190 | xfs_buf_t *bp; | |
191 | prid_t prid; | |
192 | struct xfs_dquot *udqp = NULL; | |
193 | struct xfs_dquot *gdqp = NULL; | |
194 | struct xfs_dquot *pdqp = NULL; | |
195 | uint resblks; | |
196 | ||
197 | *ipp = NULL; | |
198 | ||
199 | trace_xfs_symlink(dp, link_name); | |
200 | ||
201 | if (XFS_FORCED_SHUTDOWN(mp)) | |
202 | return -EIO; | |
203 | ||
204 | /* | |
205 | * Check component lengths of the target path name. | |
206 | */ | |
207 | pathlen = strlen(target_path); | |
208 | if (pathlen >= MAXPATHLEN) /* total string too long */ | |
209 | return -ENAMETOOLONG; | |
210 | ||
211 | udqp = gdqp = NULL; | |
212 | prid = xfs_get_initial_prid(dp); | |
213 | ||
214 | /* | |
215 | * Make sure that we have allocated dquot(s) on disk. | |
216 | */ | |
217 | error = xfs_qm_vop_dqalloc(dp, | |
218 | xfs_kuid_to_uid(current_fsuid()), | |
219 | xfs_kgid_to_gid(current_fsgid()), prid, | |
220 | XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, | |
221 | &udqp, &gdqp, &pdqp); | |
222 | if (error) | |
223 | return error; | |
224 | ||
225 | tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK); | |
226 | /* | |
227 | * The symlink will fit into the inode data fork? | |
228 | * There can't be any attributes so we get the whole variable part. | |
229 | */ | |
230 | if (pathlen <= XFS_LITINO(mp, dp->i_d.di_version)) | |
231 | fs_blocks = 0; | |
232 | else | |
233 | fs_blocks = xfs_symlink_blocks(mp, pathlen); | |
234 | resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks); | |
235 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_symlink, resblks, 0); | |
236 | if (error == -ENOSPC && fs_blocks == 0) { | |
237 | resblks = 0; | |
238 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_symlink, 0, 0); | |
239 | } | |
240 | if (error) | |
241 | goto out_trans_cancel; | |
242 | ||
243 | xfs_ilock(dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL | | |
244 | XFS_IOLOCK_PARENT | XFS_ILOCK_PARENT); | |
245 | unlock_dp_on_error = true; | |
246 | ||
247 | /* | |
248 | * Check whether the directory allows new symlinks or not. | |
249 | */ | |
250 | if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) { | |
251 | error = -EPERM; | |
252 | goto out_trans_cancel; | |
253 | } | |
254 | ||
255 | /* | |
256 | * Reserve disk quota : blocks and inode. | |
257 | */ | |
258 | error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, | |
259 | pdqp, resblks, 1, 0); | |
260 | if (error) | |
261 | goto out_trans_cancel; | |
262 | ||
263 | /* | |
264 | * Check for ability to enter directory entry, if no space reserved. | |
265 | */ | |
266 | if (!resblks) { | |
267 | error = xfs_dir_canenter(tp, dp, link_name); | |
268 | if (error) | |
269 | goto out_trans_cancel; | |
270 | } | |
271 | /* | |
272 | * Initialize the bmap freelist prior to calling either | |
273 | * bmapi or the directory create code. | |
274 | */ | |
275 | xfs_bmap_init(&free_list, &first_block); | |
276 | ||
277 | /* | |
278 | * Allocate an inode for the symlink. | |
279 | */ | |
280 | error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0, | |
281 | prid, resblks > 0, &ip, NULL); | |
282 | if (error) | |
283 | goto out_trans_cancel; | |
284 | ||
285 | /* | |
286 | * Now we join the directory inode to the transaction. We do not do it | |
287 | * earlier because xfs_dir_ialloc might commit the previous transaction | |
288 | * (and release all the locks). An error from here on will result in | |
289 | * the transaction cancel unlocking dp so don't do it explicitly in the | |
290 | * error path. | |
291 | */ | |
292 | xfs_trans_ijoin(tp, dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
293 | unlock_dp_on_error = false; | |
294 | ||
295 | /* | |
296 | * Also attach the dquot(s) to it, if applicable. | |
297 | */ | |
298 | xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp); | |
299 | ||
300 | if (resblks) | |
301 | resblks -= XFS_IALLOC_SPACE_RES(mp); | |
302 | /* | |
303 | * If the symlink will fit into the inode, write it inline. | |
304 | */ | |
305 | if (pathlen <= XFS_IFORK_DSIZE(ip)) { | |
306 | xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK); | |
307 | memcpy(ip->i_df.if_u1.if_data, target_path, pathlen); | |
308 | ip->i_d.di_size = pathlen; | |
309 | ||
310 | /* | |
311 | * The inode was initially created in extent format. | |
312 | */ | |
313 | ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT); | |
314 | ip->i_df.if_flags |= XFS_IFINLINE; | |
315 | ||
316 | ip->i_d.di_format = XFS_DINODE_FMT_LOCAL; | |
317 | xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE); | |
318 | ||
319 | } else { | |
320 | int offset; | |
321 | ||
322 | first_fsb = 0; | |
323 | nmaps = XFS_SYMLINK_MAPS; | |
324 | ||
325 | error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks, | |
326 | XFS_BMAPI_METADATA, &first_block, resblks, | |
327 | mval, &nmaps, &free_list); | |
328 | if (error) | |
329 | goto out_bmap_cancel; | |
330 | ||
331 | if (resblks) | |
332 | resblks -= fs_blocks; | |
333 | ip->i_d.di_size = pathlen; | |
334 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
335 | ||
336 | cur_chunk = target_path; | |
337 | offset = 0; | |
338 | for (n = 0; n < nmaps; n++) { | |
339 | char *buf; | |
340 | ||
341 | d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); | |
342 | byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); | |
343 | bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d, | |
344 | BTOBB(byte_cnt), 0); | |
345 | if (!bp) { | |
346 | error = -ENOMEM; | |
347 | goto out_bmap_cancel; | |
348 | } | |
349 | bp->b_ops = &xfs_symlink_buf_ops; | |
350 | ||
351 | byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt); | |
352 | byte_cnt = min(byte_cnt, pathlen); | |
353 | ||
354 | buf = bp->b_addr; | |
355 | buf += xfs_symlink_hdr_set(mp, ip->i_ino, offset, | |
356 | byte_cnt, bp); | |
357 | ||
358 | memcpy(buf, cur_chunk, byte_cnt); | |
359 | ||
360 | cur_chunk += byte_cnt; | |
361 | pathlen -= byte_cnt; | |
362 | offset += byte_cnt; | |
363 | ||
364 | xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF); | |
365 | xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) - | |
366 | (char *)bp->b_addr); | |
367 | } | |
368 | ASSERT(pathlen == 0); | |
369 | } | |
370 | ||
371 | /* | |
372 | * Create the directory entry for the symlink. | |
373 | */ | |
374 | error = xfs_dir_createname(tp, dp, link_name, ip->i_ino, | |
375 | &first_block, &free_list, resblks); | |
376 | if (error) | |
377 | goto out_bmap_cancel; | |
378 | xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
379 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
380 | ||
381 | /* | |
382 | * If this is a synchronous mount, make sure that the | |
383 | * symlink transaction goes to disk before returning to | |
384 | * the user. | |
385 | */ | |
386 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
387 | xfs_trans_set_sync(tp); | |
388 | } | |
389 | ||
390 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
391 | if (error) | |
392 | goto out_bmap_cancel; | |
393 | ||
394 | error = xfs_trans_commit(tp); | |
395 | if (error) | |
396 | goto out_release_inode; | |
397 | ||
398 | xfs_qm_dqrele(udqp); | |
399 | xfs_qm_dqrele(gdqp); | |
400 | xfs_qm_dqrele(pdqp); | |
401 | ||
402 | *ipp = ip; | |
403 | return 0; | |
404 | ||
405 | out_bmap_cancel: | |
406 | xfs_bmap_cancel(&free_list); | |
407 | out_trans_cancel: | |
408 | xfs_trans_cancel(tp); | |
409 | out_release_inode: | |
410 | /* | |
411 | * Wait until after the current transaction is aborted to finish the | |
412 | * setup of the inode and release the inode. This prevents recursive | |
413 | * transactions and deadlocks from xfs_inactive. | |
414 | */ | |
415 | if (ip) { | |
416 | xfs_finish_inode_setup(ip); | |
417 | IRELE(ip); | |
418 | } | |
419 | ||
420 | xfs_qm_dqrele(udqp); | |
421 | xfs_qm_dqrele(gdqp); | |
422 | xfs_qm_dqrele(pdqp); | |
423 | ||
424 | if (unlock_dp_on_error) | |
425 | xfs_iunlock(dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
426 | return error; | |
427 | } | |
428 | ||
429 | /* | |
430 | * Free a symlink that has blocks associated with it. | |
431 | */ | |
432 | STATIC int | |
433 | xfs_inactive_symlink_rmt( | |
434 | struct xfs_inode *ip) | |
435 | { | |
436 | xfs_buf_t *bp; | |
437 | int committed; | |
438 | int done; | |
439 | int error; | |
440 | xfs_fsblock_t first_block; | |
441 | xfs_bmap_free_t free_list; | |
442 | int i; | |
443 | xfs_mount_t *mp; | |
444 | xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS]; | |
445 | int nmaps; | |
446 | int size; | |
447 | xfs_trans_t *tp; | |
448 | ||
449 | mp = ip->i_mount; | |
450 | ASSERT(ip->i_df.if_flags & XFS_IFEXTENTS); | |
451 | /* | |
452 | * We're freeing a symlink that has some | |
453 | * blocks allocated to it. Free the | |
454 | * blocks here. We know that we've got | |
455 | * either 1 or 2 extents and that we can | |
456 | * free them all in one bunmapi call. | |
457 | */ | |
458 | ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2); | |
459 | ||
460 | tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); | |
461 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0); | |
462 | if (error) { | |
463 | xfs_trans_cancel(tp); | |
464 | return error; | |
465 | } | |
466 | ||
467 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
468 | xfs_trans_ijoin(tp, ip, 0); | |
469 | ||
470 | /* | |
471 | * Lock the inode, fix the size, and join it to the transaction. | |
472 | * Hold it so in the normal path, we still have it locked for | |
473 | * the second transaction. In the error paths we need it | |
474 | * held so the cancel won't rele it, see below. | |
475 | */ | |
476 | size = (int)ip->i_d.di_size; | |
477 | ip->i_d.di_size = 0; | |
478 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
479 | /* | |
480 | * Find the block(s) so we can inval and unmap them. | |
481 | */ | |
482 | done = 0; | |
483 | xfs_bmap_init(&free_list, &first_block); | |
484 | nmaps = ARRAY_SIZE(mval); | |
485 | error = xfs_bmapi_read(ip, 0, xfs_symlink_blocks(mp, size), | |
486 | mval, &nmaps, 0); | |
487 | if (error) | |
488 | goto error_trans_cancel; | |
489 | /* | |
490 | * Invalidate the block(s). No validation is done. | |
491 | */ | |
492 | for (i = 0; i < nmaps; i++) { | |
493 | bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, | |
494 | XFS_FSB_TO_DADDR(mp, mval[i].br_startblock), | |
495 | XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0); | |
496 | if (!bp) { | |
497 | error = -ENOMEM; | |
498 | goto error_bmap_cancel; | |
499 | } | |
500 | xfs_trans_binval(tp, bp); | |
501 | } | |
502 | /* | |
503 | * Unmap the dead block(s) to the free_list. | |
504 | */ | |
505 | error = xfs_bunmapi(tp, ip, 0, size, 0, nmaps, | |
506 | &first_block, &free_list, &done); | |
507 | if (error) | |
508 | goto error_bmap_cancel; | |
509 | ASSERT(done); | |
510 | /* | |
511 | * Commit the first transaction. This logs the EFI and the inode. | |
512 | */ | |
513 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
514 | if (error) | |
515 | goto error_bmap_cancel; | |
516 | /* | |
517 | * The transaction must have been committed, since there were | |
518 | * actually extents freed by xfs_bunmapi. See xfs_bmap_finish. | |
519 | * The new tp has the extent freeing and EFDs. | |
520 | */ | |
521 | ASSERT(committed); | |
522 | /* | |
523 | * The first xact was committed, so add the inode to the new one. | |
524 | * Mark it dirty so it will be logged and moved forward in the log as | |
525 | * part of every commit. | |
526 | */ | |
527 | xfs_trans_ijoin(tp, ip, 0); | |
528 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
529 | /* | |
530 | * Commit the transaction containing extent freeing and EFDs. | |
531 | */ | |
532 | error = xfs_trans_commit(tp); | |
533 | if (error) { | |
534 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
535 | goto error_unlock; | |
536 | } | |
537 | ||
538 | /* | |
539 | * Remove the memory for extent descriptions (just bookkeeping). | |
540 | */ | |
541 | if (ip->i_df.if_bytes) | |
542 | xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK); | |
543 | ASSERT(ip->i_df.if_bytes == 0); | |
544 | ||
545 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
546 | return 0; | |
547 | ||
548 | error_bmap_cancel: | |
549 | xfs_bmap_cancel(&free_list); | |
550 | error_trans_cancel: | |
551 | xfs_trans_cancel(tp); | |
552 | error_unlock: | |
553 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
554 | return error; | |
555 | } | |
556 | ||
557 | /* | |
558 | * xfs_inactive_symlink - free a symlink | |
559 | */ | |
560 | int | |
561 | xfs_inactive_symlink( | |
562 | struct xfs_inode *ip) | |
563 | { | |
564 | struct xfs_mount *mp = ip->i_mount; | |
565 | int pathlen; | |
566 | ||
567 | trace_xfs_inactive_symlink(ip); | |
568 | ||
569 | if (XFS_FORCED_SHUTDOWN(mp)) | |
570 | return -EIO; | |
571 | ||
572 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
573 | ||
574 | /* | |
575 | * Zero length symlinks _can_ exist. | |
576 | */ | |
577 | pathlen = (int)ip->i_d.di_size; | |
578 | if (!pathlen) { | |
579 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
580 | return 0; | |
581 | } | |
582 | ||
583 | if (pathlen < 0 || pathlen > MAXPATHLEN) { | |
584 | xfs_alert(mp, "%s: inode (0x%llx) bad symlink length (%d)", | |
585 | __func__, (unsigned long long)ip->i_ino, pathlen); | |
586 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
587 | ASSERT(0); | |
588 | return -EFSCORRUPTED; | |
589 | } | |
590 | ||
591 | if (ip->i_df.if_flags & XFS_IFINLINE) { | |
592 | if (ip->i_df.if_bytes > 0) | |
593 | xfs_idata_realloc(ip, -(ip->i_df.if_bytes), | |
594 | XFS_DATA_FORK); | |
595 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
596 | ASSERT(ip->i_df.if_bytes == 0); | |
597 | return 0; | |
598 | } | |
599 | ||
600 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
601 | ||
602 | /* remove the remote symlink */ | |
603 | return xfs_inactive_symlink_rmt(ip); | |
604 | } |