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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" | |
6ca1c906 | 21 | #include "xfs_format.h" |
19de7351 DC |
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" | |
f948dd76 DC |
46 | #include "xfs_cksum.h" |
47 | #include "xfs_buf_item.h" | |
48 | ||
49 | ||
50 | /* | |
51 | * Each contiguous block has a header, so it is not just a simple pathlen | |
52 | * to FSB conversion. | |
53 | */ | |
54 | int | |
55 | xfs_symlink_blocks( | |
56 | struct xfs_mount *mp, | |
57 | int pathlen) | |
58 | { | |
321a9583 | 59 | int buflen = XFS_SYMLINK_BUF_SPACE(mp, mp->m_sb.sb_blocksize); |
f948dd76 | 60 | |
321a9583 | 61 | return (pathlen + buflen - 1) / buflen; |
f948dd76 DC |
62 | } |
63 | ||
64 | static int | |
65 | xfs_symlink_hdr_set( | |
66 | struct xfs_mount *mp, | |
67 | xfs_ino_t ino, | |
68 | uint32_t offset, | |
69 | uint32_t size, | |
70 | struct xfs_buf *bp) | |
71 | { | |
72 | struct xfs_dsymlink_hdr *dsl = bp->b_addr; | |
73 | ||
74 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
75 | return 0; | |
76 | ||
77 | dsl->sl_magic = cpu_to_be32(XFS_SYMLINK_MAGIC); | |
78 | dsl->sl_offset = cpu_to_be32(offset); | |
79 | dsl->sl_bytes = cpu_to_be32(size); | |
80 | uuid_copy(&dsl->sl_uuid, &mp->m_sb.sb_uuid); | |
81 | dsl->sl_owner = cpu_to_be64(ino); | |
82 | dsl->sl_blkno = cpu_to_be64(bp->b_bn); | |
83 | bp->b_ops = &xfs_symlink_buf_ops; | |
84 | ||
85 | return sizeof(struct xfs_dsymlink_hdr); | |
86 | } | |
87 | ||
88 | /* | |
89 | * Checking of the symlink header is split into two parts. the verifier does | |
90 | * CRC, location and bounds checking, the unpacking function checks the path | |
91 | * parameters and owner. | |
92 | */ | |
93 | bool | |
94 | xfs_symlink_hdr_ok( | |
95 | struct xfs_mount *mp, | |
96 | xfs_ino_t ino, | |
97 | uint32_t offset, | |
98 | uint32_t size, | |
99 | struct xfs_buf *bp) | |
100 | { | |
101 | struct xfs_dsymlink_hdr *dsl = bp->b_addr; | |
102 | ||
103 | if (offset != be32_to_cpu(dsl->sl_offset)) | |
104 | return false; | |
105 | if (size != be32_to_cpu(dsl->sl_bytes)) | |
106 | return false; | |
107 | if (ino != be64_to_cpu(dsl->sl_owner)) | |
108 | return false; | |
109 | ||
110 | /* ok */ | |
111 | return true; | |
112 | } | |
113 | ||
114 | static bool | |
115 | xfs_symlink_verify( | |
116 | struct xfs_buf *bp) | |
117 | { | |
118 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
119 | struct xfs_dsymlink_hdr *dsl = bp->b_addr; | |
120 | ||
121 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
122 | return false; | |
123 | if (dsl->sl_magic != cpu_to_be32(XFS_SYMLINK_MAGIC)) | |
124 | return false; | |
125 | if (!uuid_equal(&dsl->sl_uuid, &mp->m_sb.sb_uuid)) | |
126 | return false; | |
127 | if (bp->b_bn != be64_to_cpu(dsl->sl_blkno)) | |
128 | return false; | |
129 | if (be32_to_cpu(dsl->sl_offset) + | |
130 | be32_to_cpu(dsl->sl_bytes) >= MAXPATHLEN) | |
131 | return false; | |
132 | if (dsl->sl_owner == 0) | |
133 | return false; | |
134 | ||
135 | return true; | |
136 | } | |
137 | ||
138 | static void | |
139 | xfs_symlink_read_verify( | |
140 | struct xfs_buf *bp) | |
141 | { | |
142 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
143 | ||
144 | /* no verification of non-crc buffers */ | |
145 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
146 | return; | |
147 | ||
148 | if (!xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length), | |
149 | offsetof(struct xfs_dsymlink_hdr, sl_crc)) || | |
150 | !xfs_symlink_verify(bp)) { | |
151 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); | |
152 | xfs_buf_ioerror(bp, EFSCORRUPTED); | |
153 | } | |
154 | } | |
155 | ||
156 | static void | |
157 | xfs_symlink_write_verify( | |
158 | struct xfs_buf *bp) | |
159 | { | |
160 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
161 | struct xfs_buf_log_item *bip = bp->b_fspriv; | |
162 | ||
163 | /* no verification of non-crc buffers */ | |
164 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
165 | return; | |
166 | ||
167 | if (!xfs_symlink_verify(bp)) { | |
168 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); | |
169 | xfs_buf_ioerror(bp, EFSCORRUPTED); | |
170 | return; | |
171 | } | |
172 | ||
173 | if (bip) { | |
174 | struct xfs_dsymlink_hdr *dsl = bp->b_addr; | |
175 | dsl->sl_lsn = cpu_to_be64(bip->bli_item.li_lsn); | |
176 | } | |
177 | xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), | |
178 | offsetof(struct xfs_dsymlink_hdr, sl_crc)); | |
179 | } | |
180 | ||
181 | const struct xfs_buf_ops xfs_symlink_buf_ops = { | |
182 | .verify_read = xfs_symlink_read_verify, | |
183 | .verify_write = xfs_symlink_write_verify, | |
184 | }; | |
19de7351 DC |
185 | |
186 | void | |
187 | xfs_symlink_local_to_remote( | |
188 | struct xfs_trans *tp, | |
189 | struct xfs_buf *bp, | |
190 | struct xfs_inode *ip, | |
191 | struct xfs_ifork *ifp) | |
192 | { | |
f948dd76 DC |
193 | struct xfs_mount *mp = ip->i_mount; |
194 | char *buf; | |
195 | ||
196 | if (!xfs_sb_version_hascrc(&mp->m_sb)) { | |
197 | bp->b_ops = NULL; | |
198 | memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes); | |
199 | return; | |
200 | } | |
201 | ||
202 | /* | |
203 | * As this symlink fits in an inode literal area, it must also fit in | |
204 | * the smallest buffer the filesystem supports. | |
205 | */ | |
206 | ASSERT(BBTOB(bp->b_length) >= | |
207 | ifp->if_bytes + sizeof(struct xfs_dsymlink_hdr)); | |
208 | ||
209 | bp->b_ops = &xfs_symlink_buf_ops; | |
210 | ||
211 | buf = bp->b_addr; | |
212 | buf += xfs_symlink_hdr_set(mp, ip->i_ino, 0, ifp->if_bytes, bp); | |
213 | memcpy(buf, ifp->if_u1.if_data, ifp->if_bytes); | |
19de7351 DC |
214 | } |
215 | ||
216 | /* ----- Kernel only functions below ----- */ | |
19de7351 DC |
217 | STATIC int |
218 | xfs_readlink_bmap( | |
f948dd76 DC |
219 | struct xfs_inode *ip, |
220 | char *link) | |
19de7351 | 221 | { |
f948dd76 DC |
222 | struct xfs_mount *mp = ip->i_mount; |
223 | struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS]; | |
224 | struct xfs_buf *bp; | |
225 | xfs_daddr_t d; | |
226 | char *cur_chunk; | |
227 | int pathlen = ip->i_d.di_size; | |
228 | int nmaps = XFS_SYMLINK_MAPS; | |
229 | int byte_cnt; | |
230 | int n; | |
231 | int error = 0; | |
232 | int fsblocks = 0; | |
233 | int offset; | |
19de7351 | 234 | |
f948dd76 DC |
235 | fsblocks = xfs_symlink_blocks(mp, pathlen); |
236 | error = xfs_bmapi_read(ip, 0, fsblocks, mval, &nmaps, 0); | |
19de7351 DC |
237 | if (error) |
238 | goto out; | |
239 | ||
f948dd76 | 240 | offset = 0; |
19de7351 DC |
241 | for (n = 0; n < nmaps; n++) { |
242 | d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); | |
243 | byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); | |
244 | ||
f948dd76 DC |
245 | bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0, |
246 | &xfs_symlink_buf_ops); | |
19de7351 DC |
247 | if (!bp) |
248 | return XFS_ERROR(ENOMEM); | |
249 | error = bp->b_error; | |
250 | if (error) { | |
251 | xfs_buf_ioerror_alert(bp, __func__); | |
252 | xfs_buf_relse(bp); | |
253 | goto out; | |
254 | } | |
f948dd76 | 255 | byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt); |
19de7351 DC |
256 | if (pathlen < byte_cnt) |
257 | byte_cnt = pathlen; | |
f948dd76 DC |
258 | |
259 | cur_chunk = bp->b_addr; | |
260 | if (xfs_sb_version_hascrc(&mp->m_sb)) { | |
261 | if (!xfs_symlink_hdr_ok(mp, ip->i_ino, offset, | |
262 | byte_cnt, bp)) { | |
263 | error = EFSCORRUPTED; | |
264 | xfs_alert(mp, | |
265 | "symlink header does not match required off/len/owner (0x%x/Ox%x,0x%llx)", | |
266 | offset, byte_cnt, ip->i_ino); | |
267 | xfs_buf_relse(bp); | |
268 | goto out; | |
269 | ||
270 | } | |
271 | ||
272 | cur_chunk += sizeof(struct xfs_dsymlink_hdr); | |
273 | } | |
274 | ||
275 | memcpy(link + offset, bp->b_addr, byte_cnt); | |
276 | ||
19de7351 | 277 | pathlen -= byte_cnt; |
f948dd76 | 278 | offset += byte_cnt; |
19de7351 | 279 | |
19de7351 DC |
280 | xfs_buf_relse(bp); |
281 | } | |
f948dd76 | 282 | ASSERT(pathlen == 0); |
19de7351 DC |
283 | |
284 | link[ip->i_d.di_size] = '\0'; | |
285 | error = 0; | |
286 | ||
287 | out: | |
288 | return error; | |
289 | } | |
290 | ||
291 | int | |
292 | xfs_readlink( | |
f948dd76 | 293 | struct xfs_inode *ip, |
19de7351 DC |
294 | char *link) |
295 | { | |
f948dd76 | 296 | struct xfs_mount *mp = ip->i_mount; |
19de7351 DC |
297 | xfs_fsize_t pathlen; |
298 | int error = 0; | |
299 | ||
300 | trace_xfs_readlink(ip); | |
301 | ||
302 | if (XFS_FORCED_SHUTDOWN(mp)) | |
303 | return XFS_ERROR(EIO); | |
304 | ||
305 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
306 | ||
307 | pathlen = ip->i_d.di_size; | |
308 | if (!pathlen) | |
309 | goto out; | |
310 | ||
311 | if (pathlen < 0 || pathlen > MAXPATHLEN) { | |
312 | xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)", | |
313 | __func__, (unsigned long long) ip->i_ino, | |
314 | (long long) pathlen); | |
315 | ASSERT(0); | |
316 | error = XFS_ERROR(EFSCORRUPTED); | |
317 | goto out; | |
318 | } | |
319 | ||
320 | ||
321 | if (ip->i_df.if_flags & XFS_IFINLINE) { | |
322 | memcpy(link, ip->i_df.if_u1.if_data, pathlen); | |
323 | link[pathlen] = '\0'; | |
324 | } else { | |
325 | error = xfs_readlink_bmap(ip, link); | |
326 | } | |
327 | ||
328 | out: | |
329 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
330 | return error; | |
331 | } | |
332 | ||
333 | int | |
334 | xfs_symlink( | |
f948dd76 | 335 | struct xfs_inode *dp, |
19de7351 DC |
336 | struct xfs_name *link_name, |
337 | const char *target_path, | |
338 | umode_t mode, | |
f948dd76 | 339 | struct xfs_inode **ipp) |
19de7351 | 340 | { |
f948dd76 DC |
341 | struct xfs_mount *mp = dp->i_mount; |
342 | struct xfs_trans *tp = NULL; | |
343 | struct xfs_inode *ip = NULL; | |
344 | int error = 0; | |
19de7351 | 345 | int pathlen; |
f948dd76 | 346 | struct xfs_bmap_free free_list; |
19de7351 | 347 | xfs_fsblock_t first_block; |
f948dd76 | 348 | bool unlock_dp_on_error = false; |
19de7351 DC |
349 | uint cancel_flags; |
350 | int committed; | |
351 | xfs_fileoff_t first_fsb; | |
352 | xfs_filblks_t fs_blocks; | |
353 | int nmaps; | |
f948dd76 | 354 | struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS]; |
19de7351 DC |
355 | xfs_daddr_t d; |
356 | const char *cur_chunk; | |
357 | int byte_cnt; | |
358 | int n; | |
359 | xfs_buf_t *bp; | |
360 | prid_t prid; | |
113a5683 CS |
361 | struct xfs_dquot *udqp = NULL; |
362 | struct xfs_dquot *gdqp = NULL; | |
92f8ff73 | 363 | struct xfs_dquot *pdqp = NULL; |
19de7351 DC |
364 | uint resblks; |
365 | ||
366 | *ipp = NULL; | |
19de7351 DC |
367 | |
368 | trace_xfs_symlink(dp, link_name); | |
369 | ||
370 | if (XFS_FORCED_SHUTDOWN(mp)) | |
371 | return XFS_ERROR(EIO); | |
372 | ||
373 | /* | |
374 | * Check component lengths of the target path name. | |
375 | */ | |
376 | pathlen = strlen(target_path); | |
377 | if (pathlen >= MAXPATHLEN) /* total string too long */ | |
378 | return XFS_ERROR(ENAMETOOLONG); | |
379 | ||
380 | udqp = gdqp = NULL; | |
381 | if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) | |
382 | prid = xfs_get_projid(dp); | |
383 | else | |
384 | prid = XFS_PROJID_DEFAULT; | |
385 | ||
386 | /* | |
387 | * Make sure that we have allocated dquot(s) on disk. | |
388 | */ | |
389 | error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid, | |
92f8ff73 | 390 | XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp, &pdqp); |
19de7351 DC |
391 | if (error) |
392 | goto std_return; | |
393 | ||
394 | tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK); | |
395 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
396 | /* | |
397 | * The symlink will fit into the inode data fork? | |
398 | * There can't be any attributes so we get the whole variable part. | |
399 | */ | |
400 | if (pathlen <= XFS_LITINO(mp, dp->i_d.di_version)) | |
401 | fs_blocks = 0; | |
402 | else | |
321a9583 | 403 | fs_blocks = xfs_symlink_blocks(mp, pathlen); |
19de7351 DC |
404 | resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks); |
405 | error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0, | |
406 | XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT); | |
407 | if (error == ENOSPC && fs_blocks == 0) { | |
408 | resblks = 0; | |
409 | error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0, | |
410 | XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT); | |
411 | } | |
412 | if (error) { | |
413 | cancel_flags = 0; | |
414 | goto error_return; | |
415 | } | |
416 | ||
417 | xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT); | |
418 | unlock_dp_on_error = true; | |
419 | ||
420 | /* | |
421 | * Check whether the directory allows new symlinks or not. | |
422 | */ | |
423 | if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) { | |
424 | error = XFS_ERROR(EPERM); | |
425 | goto error_return; | |
426 | } | |
427 | ||
428 | /* | |
429 | * Reserve disk quota : blocks and inode. | |
430 | */ | |
92f8ff73 CS |
431 | error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, |
432 | pdqp, resblks, 1, 0); | |
19de7351 DC |
433 | if (error) |
434 | goto error_return; | |
435 | ||
436 | /* | |
437 | * Check for ability to enter directory entry, if no space reserved. | |
438 | */ | |
439 | error = xfs_dir_canenter(tp, dp, link_name, resblks); | |
440 | if (error) | |
441 | goto error_return; | |
442 | /* | |
443 | * Initialize the bmap freelist prior to calling either | |
444 | * bmapi or the directory create code. | |
445 | */ | |
446 | xfs_bmap_init(&free_list, &first_block); | |
447 | ||
448 | /* | |
449 | * Allocate an inode for the symlink. | |
450 | */ | |
451 | error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0, | |
452 | prid, resblks > 0, &ip, NULL); | |
453 | if (error) { | |
454 | if (error == ENOSPC) | |
455 | goto error_return; | |
456 | goto error1; | |
457 | } | |
458 | ||
459 | /* | |
460 | * An error after we've joined dp to the transaction will result in the | |
461 | * transaction cancel unlocking dp so don't do it explicitly in the | |
462 | * error path. | |
463 | */ | |
464 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
465 | unlock_dp_on_error = false; | |
466 | ||
467 | /* | |
468 | * Also attach the dquot(s) to it, if applicable. | |
469 | */ | |
92f8ff73 | 470 | xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp); |
19de7351 DC |
471 | |
472 | if (resblks) | |
473 | resblks -= XFS_IALLOC_SPACE_RES(mp); | |
474 | /* | |
475 | * If the symlink will fit into the inode, write it inline. | |
476 | */ | |
477 | if (pathlen <= XFS_IFORK_DSIZE(ip)) { | |
478 | xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK); | |
479 | memcpy(ip->i_df.if_u1.if_data, target_path, pathlen); | |
480 | ip->i_d.di_size = pathlen; | |
481 | ||
482 | /* | |
483 | * The inode was initially created in extent format. | |
484 | */ | |
485 | ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT); | |
486 | ip->i_df.if_flags |= XFS_IFINLINE; | |
487 | ||
488 | ip->i_d.di_format = XFS_DINODE_FMT_LOCAL; | |
489 | xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE); | |
490 | ||
491 | } else { | |
f948dd76 DC |
492 | int offset; |
493 | ||
19de7351 DC |
494 | first_fsb = 0; |
495 | nmaps = XFS_SYMLINK_MAPS; | |
496 | ||
497 | error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks, | |
498 | XFS_BMAPI_METADATA, &first_block, resblks, | |
499 | mval, &nmaps, &free_list); | |
500 | if (error) | |
501 | goto error2; | |
502 | ||
503 | if (resblks) | |
504 | resblks -= fs_blocks; | |
505 | ip->i_d.di_size = pathlen; | |
506 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
507 | ||
508 | cur_chunk = target_path; | |
f948dd76 | 509 | offset = 0; |
19de7351 | 510 | for (n = 0; n < nmaps; n++) { |
321a9583 | 511 | char *buf; |
f948dd76 | 512 | |
19de7351 DC |
513 | d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); |
514 | byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); | |
515 | bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d, | |
516 | BTOBB(byte_cnt), 0); | |
517 | if (!bp) { | |
518 | error = ENOMEM; | |
519 | goto error2; | |
520 | } | |
f948dd76 DC |
521 | bp->b_ops = &xfs_symlink_buf_ops; |
522 | ||
523 | byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt); | |
321a9583 | 524 | byte_cnt = min(byte_cnt, pathlen); |
19de7351 | 525 | |
f948dd76 DC |
526 | buf = bp->b_addr; |
527 | buf += xfs_symlink_hdr_set(mp, ip->i_ino, offset, | |
528 | byte_cnt, bp); | |
529 | ||
530 | memcpy(buf, cur_chunk, byte_cnt); | |
531 | ||
19de7351 | 532 | cur_chunk += byte_cnt; |
f948dd76 DC |
533 | pathlen -= byte_cnt; |
534 | offset += byte_cnt; | |
19de7351 | 535 | |
f948dd76 DC |
536 | xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) - |
537 | (char *)bp->b_addr); | |
19de7351 | 538 | } |
321a9583 | 539 | ASSERT(pathlen == 0); |
19de7351 DC |
540 | } |
541 | ||
542 | /* | |
543 | * Create the directory entry for the symlink. | |
544 | */ | |
545 | error = xfs_dir_createname(tp, dp, link_name, ip->i_ino, | |
546 | &first_block, &free_list, resblks); | |
547 | if (error) | |
548 | goto error2; | |
549 | xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
550 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
551 | ||
552 | /* | |
553 | * If this is a synchronous mount, make sure that the | |
554 | * symlink transaction goes to disk before returning to | |
555 | * the user. | |
556 | */ | |
557 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
558 | xfs_trans_set_sync(tp); | |
559 | } | |
560 | ||
561 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
562 | if (error) { | |
563 | goto error2; | |
564 | } | |
565 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); | |
566 | xfs_qm_dqrele(udqp); | |
567 | xfs_qm_dqrele(gdqp); | |
92f8ff73 | 568 | xfs_qm_dqrele(pdqp); |
19de7351 DC |
569 | |
570 | *ipp = ip; | |
571 | return 0; | |
572 | ||
573 | error2: | |
574 | IRELE(ip); | |
575 | error1: | |
576 | xfs_bmap_cancel(&free_list); | |
577 | cancel_flags |= XFS_TRANS_ABORT; | |
578 | error_return: | |
579 | xfs_trans_cancel(tp, cancel_flags); | |
580 | xfs_qm_dqrele(udqp); | |
581 | xfs_qm_dqrele(gdqp); | |
92f8ff73 | 582 | xfs_qm_dqrele(pdqp); |
19de7351 DC |
583 | |
584 | if (unlock_dp_on_error) | |
585 | xfs_iunlock(dp, XFS_ILOCK_EXCL); | |
586 | std_return: | |
587 | return error; | |
588 | } | |
589 | ||
590 | /* | |
591 | * Free a symlink that has blocks associated with it. | |
592 | */ | |
725eb1eb | 593 | STATIC int |
19de7351 DC |
594 | xfs_inactive_symlink_rmt( |
595 | xfs_inode_t *ip, | |
596 | xfs_trans_t **tpp) | |
597 | { | |
598 | xfs_buf_t *bp; | |
599 | int committed; | |
600 | int done; | |
601 | int error; | |
602 | xfs_fsblock_t first_block; | |
603 | xfs_bmap_free_t free_list; | |
604 | int i; | |
605 | xfs_mount_t *mp; | |
606 | xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS]; | |
607 | int nmaps; | |
608 | xfs_trans_t *ntp; | |
609 | int size; | |
610 | xfs_trans_t *tp; | |
611 | ||
612 | tp = *tpp; | |
613 | mp = ip->i_mount; | |
725eb1eb | 614 | ASSERT(ip->i_df.if_flags & XFS_IFEXTENTS); |
19de7351 DC |
615 | /* |
616 | * We're freeing a symlink that has some | |
617 | * blocks allocated to it. Free the | |
618 | * blocks here. We know that we've got | |
619 | * either 1 or 2 extents and that we can | |
620 | * free them all in one bunmapi call. | |
621 | */ | |
622 | ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2); | |
623 | ||
624 | /* | |
625 | * Lock the inode, fix the size, and join it to the transaction. | |
626 | * Hold it so in the normal path, we still have it locked for | |
627 | * the second transaction. In the error paths we need it | |
628 | * held so the cancel won't rele it, see below. | |
629 | */ | |
630 | size = (int)ip->i_d.di_size; | |
631 | ip->i_d.di_size = 0; | |
632 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
633 | /* | |
634 | * Find the block(s) so we can inval and unmap them. | |
635 | */ | |
636 | done = 0; | |
637 | xfs_bmap_init(&free_list, &first_block); | |
638 | nmaps = ARRAY_SIZE(mval); | |
f948dd76 | 639 | error = xfs_bmapi_read(ip, 0, xfs_symlink_blocks(mp, size), |
19de7351 DC |
640 | mval, &nmaps, 0); |
641 | if (error) | |
642 | goto error0; | |
643 | /* | |
f948dd76 | 644 | * Invalidate the block(s). No validation is done. |
19de7351 DC |
645 | */ |
646 | for (i = 0; i < nmaps; i++) { | |
647 | bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, | |
648 | XFS_FSB_TO_DADDR(mp, mval[i].br_startblock), | |
649 | XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0); | |
650 | if (!bp) { | |
651 | error = ENOMEM; | |
652 | goto error1; | |
653 | } | |
654 | xfs_trans_binval(tp, bp); | |
655 | } | |
656 | /* | |
657 | * Unmap the dead block(s) to the free_list. | |
658 | */ | |
659 | if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps, | |
660 | &first_block, &free_list, &done))) | |
661 | goto error1; | |
662 | ASSERT(done); | |
663 | /* | |
664 | * Commit the first transaction. This logs the EFI and the inode. | |
665 | */ | |
666 | if ((error = xfs_bmap_finish(&tp, &free_list, &committed))) | |
667 | goto error1; | |
668 | /* | |
669 | * The transaction must have been committed, since there were | |
670 | * actually extents freed by xfs_bunmapi. See xfs_bmap_finish. | |
671 | * The new tp has the extent freeing and EFDs. | |
672 | */ | |
673 | ASSERT(committed); | |
674 | /* | |
675 | * The first xact was committed, so add the inode to the new one. | |
676 | * Mark it dirty so it will be logged and moved forward in the log as | |
677 | * part of every commit. | |
678 | */ | |
679 | xfs_trans_ijoin(tp, ip, 0); | |
680 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
681 | /* | |
682 | * Get a new, empty transaction to return to our caller. | |
683 | */ | |
684 | ntp = xfs_trans_dup(tp); | |
685 | /* | |
686 | * Commit the transaction containing extent freeing and EFDs. | |
687 | * If we get an error on the commit here or on the reserve below, | |
688 | * we need to unlock the inode since the new transaction doesn't | |
689 | * have the inode attached. | |
690 | */ | |
691 | error = xfs_trans_commit(tp, 0); | |
692 | tp = ntp; | |
693 | if (error) { | |
694 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
695 | goto error0; | |
696 | } | |
697 | /* | |
698 | * transaction commit worked ok so we can drop the extra ticket | |
699 | * reference that we gained in xfs_trans_dup() | |
700 | */ | |
701 | xfs_log_ticket_put(tp->t_ticket); | |
702 | ||
703 | /* | |
704 | * Remove the memory for extent descriptions (just bookkeeping). | |
705 | */ | |
706 | if (ip->i_df.if_bytes) | |
707 | xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK); | |
708 | ASSERT(ip->i_df.if_bytes == 0); | |
709 | /* | |
710 | * Put an itruncate log reservation in the new transaction | |
711 | * for our caller. | |
712 | */ | |
713 | if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, | |
714 | XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) { | |
715 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
716 | goto error0; | |
717 | } | |
718 | ||
719 | xfs_trans_ijoin(tp, ip, 0); | |
720 | *tpp = tp; | |
721 | return 0; | |
722 | ||
723 | error1: | |
724 | xfs_bmap_cancel(&free_list); | |
725 | error0: | |
726 | return error; | |
727 | } | |
725eb1eb MT |
728 | |
729 | /* | |
730 | * xfs_inactive_symlink - free a symlink | |
731 | */ | |
732 | int | |
733 | xfs_inactive_symlink( | |
734 | struct xfs_inode *ip, | |
735 | struct xfs_trans **tp) | |
736 | { | |
737 | struct xfs_mount *mp = ip->i_mount; | |
738 | int pathlen; | |
739 | ||
740 | trace_xfs_inactive_symlink(ip); | |
741 | ||
742 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); | |
743 | ||
744 | if (XFS_FORCED_SHUTDOWN(mp)) | |
745 | return XFS_ERROR(EIO); | |
746 | ||
747 | /* | |
748 | * Zero length symlinks _can_ exist. | |
749 | */ | |
750 | pathlen = (int)ip->i_d.di_size; | |
751 | if (!pathlen) | |
752 | return 0; | |
753 | ||
754 | if (pathlen < 0 || pathlen > MAXPATHLEN) { | |
755 | xfs_alert(mp, "%s: inode (0x%llx) bad symlink length (%d)", | |
756 | __func__, (unsigned long long)ip->i_ino, pathlen); | |
757 | ASSERT(0); | |
758 | return XFS_ERROR(EFSCORRUPTED); | |
759 | } | |
760 | ||
761 | if (ip->i_df.if_flags & XFS_IFINLINE) { | |
762 | if (ip->i_df.if_bytes > 0) | |
763 | xfs_idata_realloc(ip, -(ip->i_df.if_bytes), | |
764 | XFS_DATA_FORK); | |
765 | ASSERT(ip->i_df.if_bytes == 0); | |
766 | return 0; | |
767 | } | |
768 | ||
769 | /* remove the remote symlink */ | |
770 | return xfs_inactive_symlink_rmt(ip, tp); | |
771 | } |