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