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19de7351 DC |
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_fs.h" | |
21 | #include "xfs_types.h" | |
22 | #include "xfs_bit.h" | |
23 | #include "xfs_log.h" | |
24 | #include "xfs_trans.h" | |
25 | #include "xfs_sb.h" | |
26 | #include "xfs_ag.h" | |
27 | #include "xfs_dir2.h" | |
28 | #include "xfs_mount.h" | |
29 | #include "xfs_da_btree.h" | |
30 | #include "xfs_bmap_btree.h" | |
31 | #include "xfs_ialloc_btree.h" | |
32 | #include "xfs_dinode.h" | |
33 | #include "xfs_inode.h" | |
34 | #include "xfs_inode_item.h" | |
35 | #include "xfs_itable.h" | |
36 | #include "xfs_ialloc.h" | |
37 | #include "xfs_alloc.h" | |
38 | #include "xfs_bmap.h" | |
39 | #include "xfs_error.h" | |
40 | #include "xfs_quota.h" | |
41 | #include "xfs_utils.h" | |
42 | #include "xfs_trans_space.h" | |
43 | #include "xfs_log_priv.h" | |
44 | #include "xfs_trace.h" | |
45 | #include "xfs_symlink.h" | |
46 | ||
47 | void | |
48 | xfs_symlink_local_to_remote( | |
49 | struct xfs_trans *tp, | |
50 | struct xfs_buf *bp, | |
51 | struct xfs_inode *ip, | |
52 | struct xfs_ifork *ifp) | |
53 | { | |
54 | /* remote symlink blocks are not verifiable until CRCs come along */ | |
55 | bp->b_ops = NULL; | |
56 | memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes); | |
57 | } | |
58 | ||
59 | /* ----- Kernel only functions below ----- */ | |
60 | ||
61 | STATIC int | |
62 | xfs_readlink_bmap( | |
63 | xfs_inode_t *ip, | |
64 | char *link) | |
65 | { | |
66 | xfs_mount_t *mp = ip->i_mount; | |
67 | int pathlen = ip->i_d.di_size; | |
68 | int nmaps = XFS_SYMLINK_MAPS; | |
69 | xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS]; | |
70 | xfs_daddr_t d; | |
71 | int byte_cnt; | |
72 | int n; | |
73 | xfs_buf_t *bp; | |
74 | int error = 0; | |
75 | ||
76 | error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, pathlen), mval, &nmaps, | |
77 | 0); | |
78 | if (error) | |
79 | goto out; | |
80 | ||
81 | for (n = 0; n < nmaps; n++) { | |
82 | d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); | |
83 | byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); | |
84 | ||
85 | bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0, NULL); | |
86 | if (!bp) | |
87 | return XFS_ERROR(ENOMEM); | |
88 | error = bp->b_error; | |
89 | if (error) { | |
90 | xfs_buf_ioerror_alert(bp, __func__); | |
91 | xfs_buf_relse(bp); | |
92 | goto out; | |
93 | } | |
94 | if (pathlen < byte_cnt) | |
95 | byte_cnt = pathlen; | |
96 | pathlen -= byte_cnt; | |
97 | ||
98 | memcpy(link, bp->b_addr, byte_cnt); | |
99 | xfs_buf_relse(bp); | |
100 | } | |
101 | ||
102 | link[ip->i_d.di_size] = '\0'; | |
103 | error = 0; | |
104 | ||
105 | out: | |
106 | return error; | |
107 | } | |
108 | ||
109 | int | |
110 | xfs_readlink( | |
111 | xfs_inode_t *ip, | |
112 | char *link) | |
113 | { | |
114 | xfs_mount_t *mp = ip->i_mount; | |
115 | xfs_fsize_t pathlen; | |
116 | int error = 0; | |
117 | ||
118 | trace_xfs_readlink(ip); | |
119 | ||
120 | if (XFS_FORCED_SHUTDOWN(mp)) | |
121 | return XFS_ERROR(EIO); | |
122 | ||
123 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
124 | ||
125 | pathlen = ip->i_d.di_size; | |
126 | if (!pathlen) | |
127 | goto out; | |
128 | ||
129 | if (pathlen < 0 || pathlen > MAXPATHLEN) { | |
130 | xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)", | |
131 | __func__, (unsigned long long) ip->i_ino, | |
132 | (long long) pathlen); | |
133 | ASSERT(0); | |
134 | error = XFS_ERROR(EFSCORRUPTED); | |
135 | goto out; | |
136 | } | |
137 | ||
138 | ||
139 | if (ip->i_df.if_flags & XFS_IFINLINE) { | |
140 | memcpy(link, ip->i_df.if_u1.if_data, pathlen); | |
141 | link[pathlen] = '\0'; | |
142 | } else { | |
143 | error = xfs_readlink_bmap(ip, link); | |
144 | } | |
145 | ||
146 | out: | |
147 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
148 | return error; | |
149 | } | |
150 | ||
151 | int | |
152 | xfs_symlink( | |
153 | xfs_inode_t *dp, | |
154 | struct xfs_name *link_name, | |
155 | const char *target_path, | |
156 | umode_t mode, | |
157 | xfs_inode_t **ipp) | |
158 | { | |
159 | xfs_mount_t *mp = dp->i_mount; | |
160 | xfs_trans_t *tp; | |
161 | xfs_inode_t *ip; | |
162 | int error; | |
163 | int pathlen; | |
164 | xfs_bmap_free_t free_list; | |
165 | xfs_fsblock_t first_block; | |
166 | bool unlock_dp_on_error = false; | |
167 | uint cancel_flags; | |
168 | int committed; | |
169 | xfs_fileoff_t first_fsb; | |
170 | xfs_filblks_t fs_blocks; | |
171 | int nmaps; | |
172 | xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS]; | |
173 | xfs_daddr_t d; | |
174 | const char *cur_chunk; | |
175 | int byte_cnt; | |
176 | int n; | |
177 | xfs_buf_t *bp; | |
178 | prid_t prid; | |
179 | struct xfs_dquot *udqp, *gdqp; | |
180 | uint resblks; | |
181 | ||
182 | *ipp = NULL; | |
183 | error = 0; | |
184 | ip = NULL; | |
185 | tp = NULL; | |
186 | ||
187 | trace_xfs_symlink(dp, link_name); | |
188 | ||
189 | if (XFS_FORCED_SHUTDOWN(mp)) | |
190 | return XFS_ERROR(EIO); | |
191 | ||
192 | /* | |
193 | * Check component lengths of the target path name. | |
194 | */ | |
195 | pathlen = strlen(target_path); | |
196 | if (pathlen >= MAXPATHLEN) /* total string too long */ | |
197 | return XFS_ERROR(ENAMETOOLONG); | |
198 | ||
199 | udqp = gdqp = NULL; | |
200 | if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) | |
201 | prid = xfs_get_projid(dp); | |
202 | else | |
203 | prid = XFS_PROJID_DEFAULT; | |
204 | ||
205 | /* | |
206 | * Make sure that we have allocated dquot(s) on disk. | |
207 | */ | |
208 | error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid, | |
209 | XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp); | |
210 | if (error) | |
211 | goto std_return; | |
212 | ||
213 | tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK); | |
214 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
215 | /* | |
216 | * The symlink will fit into the inode data fork? | |
217 | * There can't be any attributes so we get the whole variable part. | |
218 | */ | |
219 | if (pathlen <= XFS_LITINO(mp, dp->i_d.di_version)) | |
220 | fs_blocks = 0; | |
221 | else | |
222 | fs_blocks = XFS_B_TO_FSB(mp, pathlen); | |
223 | resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks); | |
224 | error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0, | |
225 | XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT); | |
226 | if (error == ENOSPC && fs_blocks == 0) { | |
227 | resblks = 0; | |
228 | error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0, | |
229 | XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT); | |
230 | } | |
231 | if (error) { | |
232 | cancel_flags = 0; | |
233 | goto error_return; | |
234 | } | |
235 | ||
236 | xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT); | |
237 | unlock_dp_on_error = true; | |
238 | ||
239 | /* | |
240 | * Check whether the directory allows new symlinks or not. | |
241 | */ | |
242 | if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) { | |
243 | error = XFS_ERROR(EPERM); | |
244 | goto error_return; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Reserve disk quota : blocks and inode. | |
249 | */ | |
250 | error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0); | |
251 | if (error) | |
252 | goto error_return; | |
253 | ||
254 | /* | |
255 | * Check for ability to enter directory entry, if no space reserved. | |
256 | */ | |
257 | error = xfs_dir_canenter(tp, dp, link_name, resblks); | |
258 | if (error) | |
259 | goto error_return; | |
260 | /* | |
261 | * Initialize the bmap freelist prior to calling either | |
262 | * bmapi or the directory create code. | |
263 | */ | |
264 | xfs_bmap_init(&free_list, &first_block); | |
265 | ||
266 | /* | |
267 | * Allocate an inode for the symlink. | |
268 | */ | |
269 | error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0, | |
270 | prid, resblks > 0, &ip, NULL); | |
271 | if (error) { | |
272 | if (error == ENOSPC) | |
273 | goto error_return; | |
274 | goto error1; | |
275 | } | |
276 | ||
277 | /* | |
278 | * An error after we've joined dp to the transaction will result in the | |
279 | * transaction cancel unlocking dp so don't do it explicitly in the | |
280 | * error path. | |
281 | */ | |
282 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
283 | unlock_dp_on_error = false; | |
284 | ||
285 | /* | |
286 | * Also attach the dquot(s) to it, if applicable. | |
287 | */ | |
288 | xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp); | |
289 | ||
290 | if (resblks) | |
291 | resblks -= XFS_IALLOC_SPACE_RES(mp); | |
292 | /* | |
293 | * If the symlink will fit into the inode, write it inline. | |
294 | */ | |
295 | if (pathlen <= XFS_IFORK_DSIZE(ip)) { | |
296 | xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK); | |
297 | memcpy(ip->i_df.if_u1.if_data, target_path, pathlen); | |
298 | ip->i_d.di_size = pathlen; | |
299 | ||
300 | /* | |
301 | * The inode was initially created in extent format. | |
302 | */ | |
303 | ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT); | |
304 | ip->i_df.if_flags |= XFS_IFINLINE; | |
305 | ||
306 | ip->i_d.di_format = XFS_DINODE_FMT_LOCAL; | |
307 | xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE); | |
308 | ||
309 | } else { | |
310 | first_fsb = 0; | |
311 | nmaps = XFS_SYMLINK_MAPS; | |
312 | ||
313 | error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks, | |
314 | XFS_BMAPI_METADATA, &first_block, resblks, | |
315 | mval, &nmaps, &free_list); | |
316 | if (error) | |
317 | goto error2; | |
318 | ||
319 | if (resblks) | |
320 | resblks -= fs_blocks; | |
321 | ip->i_d.di_size = pathlen; | |
322 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
323 | ||
324 | cur_chunk = target_path; | |
325 | for (n = 0; n < nmaps; n++) { | |
326 | d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); | |
327 | byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); | |
328 | bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d, | |
329 | BTOBB(byte_cnt), 0); | |
330 | if (!bp) { | |
331 | error = ENOMEM; | |
332 | goto error2; | |
333 | } | |
334 | if (pathlen < byte_cnt) { | |
335 | byte_cnt = pathlen; | |
336 | } | |
337 | pathlen -= byte_cnt; | |
338 | ||
339 | memcpy(bp->b_addr, cur_chunk, byte_cnt); | |
340 | cur_chunk += byte_cnt; | |
341 | ||
342 | xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1); | |
343 | } | |
344 | } | |
345 | ||
346 | /* | |
347 | * Create the directory entry for the symlink. | |
348 | */ | |
349 | error = xfs_dir_createname(tp, dp, link_name, ip->i_ino, | |
350 | &first_block, &free_list, resblks); | |
351 | if (error) | |
352 | goto error2; | |
353 | xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
354 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
355 | ||
356 | /* | |
357 | * If this is a synchronous mount, make sure that the | |
358 | * symlink transaction goes to disk before returning to | |
359 | * the user. | |
360 | */ | |
361 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
362 | xfs_trans_set_sync(tp); | |
363 | } | |
364 | ||
365 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
366 | if (error) { | |
367 | goto error2; | |
368 | } | |
369 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); | |
370 | xfs_qm_dqrele(udqp); | |
371 | xfs_qm_dqrele(gdqp); | |
372 | ||
373 | *ipp = ip; | |
374 | return 0; | |
375 | ||
376 | error2: | |
377 | IRELE(ip); | |
378 | error1: | |
379 | xfs_bmap_cancel(&free_list); | |
380 | cancel_flags |= XFS_TRANS_ABORT; | |
381 | error_return: | |
382 | xfs_trans_cancel(tp, cancel_flags); | |
383 | xfs_qm_dqrele(udqp); | |
384 | xfs_qm_dqrele(gdqp); | |
385 | ||
386 | if (unlock_dp_on_error) | |
387 | xfs_iunlock(dp, XFS_ILOCK_EXCL); | |
388 | std_return: | |
389 | return error; | |
390 | } | |
391 | ||
392 | /* | |
393 | * Free a symlink that has blocks associated with it. | |
394 | */ | |
395 | STATIC int | |
396 | xfs_inactive_symlink_rmt( | |
397 | xfs_inode_t *ip, | |
398 | xfs_trans_t **tpp) | |
399 | { | |
400 | xfs_buf_t *bp; | |
401 | int committed; | |
402 | int done; | |
403 | int error; | |
404 | xfs_fsblock_t first_block; | |
405 | xfs_bmap_free_t free_list; | |
406 | int i; | |
407 | xfs_mount_t *mp; | |
408 | xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS]; | |
409 | int nmaps; | |
410 | xfs_trans_t *ntp; | |
411 | int size; | |
412 | xfs_trans_t *tp; | |
413 | ||
414 | tp = *tpp; | |
415 | mp = ip->i_mount; | |
416 | ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip)); | |
417 | /* | |
418 | * We're freeing a symlink that has some | |
419 | * blocks allocated to it. Free the | |
420 | * blocks here. We know that we've got | |
421 | * either 1 or 2 extents and that we can | |
422 | * free them all in one bunmapi call. | |
423 | */ | |
424 | ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2); | |
425 | ||
426 | /* | |
427 | * Lock the inode, fix the size, and join it to the transaction. | |
428 | * Hold it so in the normal path, we still have it locked for | |
429 | * the second transaction. In the error paths we need it | |
430 | * held so the cancel won't rele it, see below. | |
431 | */ | |
432 | size = (int)ip->i_d.di_size; | |
433 | ip->i_d.di_size = 0; | |
434 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
435 | /* | |
436 | * Find the block(s) so we can inval and unmap them. | |
437 | */ | |
438 | done = 0; | |
439 | xfs_bmap_init(&free_list, &first_block); | |
440 | nmaps = ARRAY_SIZE(mval); | |
441 | error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, size), | |
442 | mval, &nmaps, 0); | |
443 | if (error) | |
444 | goto error0; | |
445 | /* | |
446 | * Invalidate the block(s). | |
447 | */ | |
448 | for (i = 0; i < nmaps; i++) { | |
449 | bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, | |
450 | XFS_FSB_TO_DADDR(mp, mval[i].br_startblock), | |
451 | XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0); | |
452 | if (!bp) { | |
453 | error = ENOMEM; | |
454 | goto error1; | |
455 | } | |
456 | xfs_trans_binval(tp, bp); | |
457 | } | |
458 | /* | |
459 | * Unmap the dead block(s) to the free_list. | |
460 | */ | |
461 | if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps, | |
462 | &first_block, &free_list, &done))) | |
463 | goto error1; | |
464 | ASSERT(done); | |
465 | /* | |
466 | * Commit the first transaction. This logs the EFI and the inode. | |
467 | */ | |
468 | if ((error = xfs_bmap_finish(&tp, &free_list, &committed))) | |
469 | goto error1; | |
470 | /* | |
471 | * The transaction must have been committed, since there were | |
472 | * actually extents freed by xfs_bunmapi. See xfs_bmap_finish. | |
473 | * The new tp has the extent freeing and EFDs. | |
474 | */ | |
475 | ASSERT(committed); | |
476 | /* | |
477 | * The first xact was committed, so add the inode to the new one. | |
478 | * Mark it dirty so it will be logged and moved forward in the log as | |
479 | * part of every commit. | |
480 | */ | |
481 | xfs_trans_ijoin(tp, ip, 0); | |
482 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
483 | /* | |
484 | * Get a new, empty transaction to return to our caller. | |
485 | */ | |
486 | ntp = xfs_trans_dup(tp); | |
487 | /* | |
488 | * Commit the transaction containing extent freeing and EFDs. | |
489 | * If we get an error on the commit here or on the reserve below, | |
490 | * we need to unlock the inode since the new transaction doesn't | |
491 | * have the inode attached. | |
492 | */ | |
493 | error = xfs_trans_commit(tp, 0); | |
494 | tp = ntp; | |
495 | if (error) { | |
496 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
497 | goto error0; | |
498 | } | |
499 | /* | |
500 | * transaction commit worked ok so we can drop the extra ticket | |
501 | * reference that we gained in xfs_trans_dup() | |
502 | */ | |
503 | xfs_log_ticket_put(tp->t_ticket); | |
504 | ||
505 | /* | |
506 | * Remove the memory for extent descriptions (just bookkeeping). | |
507 | */ | |
508 | if (ip->i_df.if_bytes) | |
509 | xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK); | |
510 | ASSERT(ip->i_df.if_bytes == 0); | |
511 | /* | |
512 | * Put an itruncate log reservation in the new transaction | |
513 | * for our caller. | |
514 | */ | |
515 | if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, | |
516 | XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) { | |
517 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
518 | goto error0; | |
519 | } | |
520 | ||
521 | xfs_trans_ijoin(tp, ip, 0); | |
522 | *tpp = tp; | |
523 | return 0; | |
524 | ||
525 | error1: | |
526 | xfs_bmap_cancel(&free_list); | |
527 | error0: | |
528 | return error; | |
529 | } |