Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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. | |
1da177e4 | 13 | * |
7b718769 NS |
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 | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 LT |
24 | #include "xfs_trans.h" |
25 | #include "xfs_sb.h" | |
a844f451 | 26 | #include "xfs_ag.h" |
1da177e4 LT |
27 | #include "xfs_dir.h" |
28 | #include "xfs_dir2.h" | |
29 | #include "xfs_dmapi.h" | |
30 | #include "xfs_mount.h" | |
31 | #include "xfs_bmap_btree.h" | |
1da177e4 LT |
32 | #include "xfs_dir_sf.h" |
33 | #include "xfs_dir2_sf.h" | |
a844f451 | 34 | #include "xfs_attr_sf.h" |
1da177e4 | 35 | #include "xfs_dinode.h" |
1da177e4 | 36 | #include "xfs_inode.h" |
a844f451 | 37 | #include "xfs_inode_item.h" |
1da177e4 LT |
38 | #include "xfs_bmap.h" |
39 | #include "xfs_error.h" | |
40 | #include "xfs_quota.h" | |
41 | #include "xfs_rw.h" | |
42 | #include "xfs_itable.h" | |
43 | #include "xfs_utils.h" | |
44 | ||
45 | /* | |
46 | * xfs_get_dir_entry is used to get a reference to an inode given | |
47 | * its parent directory inode and the name of the file. It does | |
48 | * not lock the child inode, and it unlocks the directory before | |
49 | * returning. The directory's generation number is returned for | |
50 | * use by a later call to xfs_lock_dir_and_entry. | |
51 | */ | |
52 | int | |
53 | xfs_get_dir_entry( | |
54 | vname_t *dentry, | |
55 | xfs_inode_t **ipp) | |
56 | { | |
67fcaa73 | 57 | bhv_vnode_t *vp; |
1da177e4 LT |
58 | |
59 | vp = VNAME_TO_VNODE(dentry); | |
75e17b3c CH |
60 | |
61 | *ipp = xfs_vtoi(vp); | |
62 | if (!*ipp) | |
1da177e4 | 63 | return XFS_ERROR(ENOENT); |
1da177e4 | 64 | VN_HOLD(vp); |
1da177e4 LT |
65 | return 0; |
66 | } | |
67 | ||
68 | int | |
69 | xfs_dir_lookup_int( | |
70 | bhv_desc_t *dir_bdp, | |
71 | uint lock_mode, | |
72 | vname_t *dentry, | |
73 | xfs_ino_t *inum, | |
74 | xfs_inode_t **ipp) | |
75 | { | |
67fcaa73 | 76 | bhv_vnode_t *dir_vp; |
1da177e4 LT |
77 | xfs_inode_t *dp; |
78 | int error; | |
79 | ||
80 | dir_vp = BHV_TO_VNODE(dir_bdp); | |
81 | vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
82 | ||
83 | dp = XFS_BHVTOI(dir_bdp); | |
84 | ||
85 | error = XFS_DIR_LOOKUP(dp->i_mount, NULL, dp, | |
86 | VNAME(dentry), VNAMELEN(dentry), inum); | |
87 | if (!error) { | |
88 | /* | |
89 | * Unlock the directory. We do this because we can't | |
90 | * hold the directory lock while doing the vn_get() | |
91 | * in xfs_iget(). Doing so could cause us to hold | |
92 | * a lock while waiting for the inode to finish | |
93 | * being inactive while it's waiting for a log | |
94 | * reservation in the inactive routine. | |
95 | */ | |
96 | xfs_iunlock(dp, lock_mode); | |
97 | error = xfs_iget(dp->i_mount, NULL, *inum, 0, 0, ipp, 0); | |
98 | xfs_ilock(dp, lock_mode); | |
99 | ||
100 | if (error) { | |
101 | *ipp = NULL; | |
102 | } else if ((*ipp)->i_d.di_mode == 0) { | |
103 | /* | |
104 | * The inode has been freed. Something is | |
105 | * wrong so just get out of here. | |
106 | */ | |
107 | xfs_iunlock(dp, lock_mode); | |
108 | xfs_iput_new(*ipp, 0); | |
109 | *ipp = NULL; | |
110 | xfs_ilock(dp, lock_mode); | |
111 | error = XFS_ERROR(ENOENT); | |
112 | } | |
113 | } | |
114 | return error; | |
115 | } | |
116 | ||
117 | /* | |
118 | * Allocates a new inode from disk and return a pointer to the | |
119 | * incore copy. This routine will internally commit the current | |
120 | * transaction and allocate a new one if the Space Manager needed | |
121 | * to do an allocation to replenish the inode free-list. | |
122 | * | |
123 | * This routine is designed to be called from xfs_create and | |
124 | * xfs_create_dir. | |
125 | * | |
126 | */ | |
127 | int | |
128 | xfs_dir_ialloc( | |
129 | xfs_trans_t **tpp, /* input: current transaction; | |
130 | output: may be a new transaction. */ | |
131 | xfs_inode_t *dp, /* directory within whose allocate | |
132 | the inode. */ | |
133 | mode_t mode, | |
31b084ae | 134 | xfs_nlink_t nlink, |
1da177e4 LT |
135 | xfs_dev_t rdev, |
136 | cred_t *credp, | |
137 | prid_t prid, /* project id */ | |
138 | int okalloc, /* ok to allocate new space */ | |
139 | xfs_inode_t **ipp, /* pointer to inode; it will be | |
140 | locked. */ | |
141 | int *committed) | |
142 | ||
143 | { | |
144 | xfs_trans_t *tp; | |
145 | xfs_trans_t *ntp; | |
146 | xfs_inode_t *ip; | |
147 | xfs_buf_t *ialloc_context = NULL; | |
148 | boolean_t call_again = B_FALSE; | |
149 | int code; | |
150 | uint log_res; | |
151 | uint log_count; | |
152 | void *dqinfo; | |
153 | uint tflags; | |
154 | ||
155 | tp = *tpp; | |
156 | ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); | |
157 | ||
158 | /* | |
159 | * xfs_ialloc will return a pointer to an incore inode if | |
160 | * the Space Manager has an available inode on the free | |
161 | * list. Otherwise, it will do an allocation and replenish | |
162 | * the freelist. Since we can only do one allocation per | |
163 | * transaction without deadlocks, we will need to commit the | |
164 | * current transaction and start a new one. We will then | |
165 | * need to call xfs_ialloc again to get the inode. | |
166 | * | |
167 | * If xfs_ialloc did an allocation to replenish the freelist, | |
168 | * it returns the bp containing the head of the freelist as | |
169 | * ialloc_context. We will hold a lock on it across the | |
170 | * transaction commit so that no other process can steal | |
171 | * the inode(s) that we've just allocated. | |
172 | */ | |
173 | code = xfs_ialloc(tp, dp, mode, nlink, rdev, credp, prid, okalloc, | |
174 | &ialloc_context, &call_again, &ip); | |
175 | ||
176 | /* | |
177 | * Return an error if we were unable to allocate a new inode. | |
178 | * This should only happen if we run out of space on disk or | |
179 | * encounter a disk error. | |
180 | */ | |
181 | if (code) { | |
182 | *ipp = NULL; | |
183 | return code; | |
184 | } | |
185 | if (!call_again && (ip == NULL)) { | |
186 | *ipp = NULL; | |
187 | return XFS_ERROR(ENOSPC); | |
188 | } | |
189 | ||
190 | /* | |
191 | * If call_again is set, then we were unable to get an | |
192 | * inode in one operation. We need to commit the current | |
193 | * transaction and call xfs_ialloc() again. It is guaranteed | |
194 | * to succeed the second time. | |
195 | */ | |
196 | if (call_again) { | |
197 | ||
198 | /* | |
199 | * Normally, xfs_trans_commit releases all the locks. | |
200 | * We call bhold to hang on to the ialloc_context across | |
201 | * the commit. Holding this buffer prevents any other | |
202 | * processes from doing any allocations in this | |
203 | * allocation group. | |
204 | */ | |
205 | xfs_trans_bhold(tp, ialloc_context); | |
206 | /* | |
207 | * Save the log reservation so we can use | |
208 | * them in the next transaction. | |
209 | */ | |
210 | log_res = xfs_trans_get_log_res(tp); | |
211 | log_count = xfs_trans_get_log_count(tp); | |
212 | ||
213 | /* | |
214 | * We want the quota changes to be associated with the next | |
215 | * transaction, NOT this one. So, detach the dqinfo from this | |
216 | * and attach it to the next transaction. | |
217 | */ | |
218 | dqinfo = NULL; | |
219 | tflags = 0; | |
220 | if (tp->t_dqinfo) { | |
221 | dqinfo = (void *)tp->t_dqinfo; | |
222 | tp->t_dqinfo = NULL; | |
223 | tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY; | |
224 | tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY); | |
225 | } | |
226 | ||
227 | ntp = xfs_trans_dup(tp); | |
228 | code = xfs_trans_commit(tp, 0, NULL); | |
229 | tp = ntp; | |
230 | if (committed != NULL) { | |
231 | *committed = 1; | |
232 | } | |
233 | /* | |
234 | * If we get an error during the commit processing, | |
235 | * release the buffer that is still held and return | |
236 | * to the caller. | |
237 | */ | |
238 | if (code) { | |
239 | xfs_buf_relse(ialloc_context); | |
240 | if (dqinfo) { | |
241 | tp->t_dqinfo = dqinfo; | |
242 | XFS_TRANS_FREE_DQINFO(tp->t_mountp, tp); | |
243 | } | |
244 | *tpp = ntp; | |
245 | *ipp = NULL; | |
246 | return code; | |
247 | } | |
248 | code = xfs_trans_reserve(tp, 0, log_res, 0, | |
249 | XFS_TRANS_PERM_LOG_RES, log_count); | |
250 | /* | |
251 | * Re-attach the quota info that we detached from prev trx. | |
252 | */ | |
253 | if (dqinfo) { | |
254 | tp->t_dqinfo = dqinfo; | |
255 | tp->t_flags |= tflags; | |
256 | } | |
257 | ||
258 | if (code) { | |
259 | xfs_buf_relse(ialloc_context); | |
260 | *tpp = ntp; | |
261 | *ipp = NULL; | |
262 | return code; | |
263 | } | |
264 | xfs_trans_bjoin(tp, ialloc_context); | |
265 | ||
266 | /* | |
267 | * Call ialloc again. Since we've locked out all | |
268 | * other allocations in this allocation group, | |
269 | * this call should always succeed. | |
270 | */ | |
271 | code = xfs_ialloc(tp, dp, mode, nlink, rdev, credp, prid, | |
272 | okalloc, &ialloc_context, &call_again, &ip); | |
273 | ||
274 | /* | |
275 | * If we get an error at this point, return to the caller | |
276 | * so that the current transaction can be aborted. | |
277 | */ | |
278 | if (code) { | |
279 | *tpp = tp; | |
280 | *ipp = NULL; | |
281 | return code; | |
282 | } | |
283 | ASSERT ((!call_again) && (ip != NULL)); | |
284 | ||
285 | } else { | |
286 | if (committed != NULL) { | |
287 | *committed = 0; | |
288 | } | |
289 | } | |
290 | ||
291 | *ipp = ip; | |
292 | *tpp = tp; | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | /* | |
298 | * Decrement the link count on an inode & log the change. | |
299 | * If this causes the link count to go to zero, initiate the | |
300 | * logging activity required to truncate a file. | |
301 | */ | |
302 | int /* error */ | |
303 | xfs_droplink( | |
304 | xfs_trans_t *tp, | |
305 | xfs_inode_t *ip) | |
306 | { | |
307 | int error; | |
308 | ||
309 | xfs_ichgtime(ip, XFS_ICHGTIME_CHG); | |
310 | ||
311 | ASSERT (ip->i_d.di_nlink > 0); | |
312 | ip->i_d.di_nlink--; | |
313 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
314 | ||
315 | error = 0; | |
316 | if (ip->i_d.di_nlink == 0) { | |
317 | /* | |
318 | * We're dropping the last link to this file. | |
319 | * Move the on-disk inode to the AGI unlinked list. | |
320 | * From xfs_inactive() we will pull the inode from | |
321 | * the list and free it. | |
322 | */ | |
323 | error = xfs_iunlink(tp, ip); | |
324 | } | |
325 | return error; | |
326 | } | |
327 | ||
328 | /* | |
329 | * This gets called when the inode's version needs to be changed from 1 to 2. | |
330 | * Currently this happens when the nlink field overflows the old 16-bit value | |
331 | * or when chproj is called to change the project for the first time. | |
332 | * As a side effect the superblock version will also get rev'd | |
333 | * to contain the NLINK bit. | |
334 | */ | |
335 | void | |
336 | xfs_bump_ino_vers2( | |
337 | xfs_trans_t *tp, | |
338 | xfs_inode_t *ip) | |
339 | { | |
340 | xfs_mount_t *mp; | |
341 | unsigned long s; | |
342 | ||
343 | ASSERT(ismrlocked (&ip->i_lock, MR_UPDATE)); | |
344 | ASSERT(ip->i_d.di_version == XFS_DINODE_VERSION_1); | |
345 | ||
346 | ip->i_d.di_version = XFS_DINODE_VERSION_2; | |
347 | ip->i_d.di_onlink = 0; | |
348 | memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad)); | |
349 | mp = tp->t_mountp; | |
350 | if (!XFS_SB_VERSION_HASNLINK(&mp->m_sb)) { | |
351 | s = XFS_SB_LOCK(mp); | |
352 | if (!XFS_SB_VERSION_HASNLINK(&mp->m_sb)) { | |
353 | XFS_SB_VERSION_ADDNLINK(&mp->m_sb); | |
354 | XFS_SB_UNLOCK(mp, s); | |
355 | xfs_mod_sb(tp, XFS_SB_VERSIONNUM); | |
356 | } else { | |
357 | XFS_SB_UNLOCK(mp, s); | |
358 | } | |
359 | } | |
360 | /* Caller must log the inode */ | |
361 | } | |
362 | ||
363 | /* | |
364 | * Increment the link count on an inode & log the change. | |
365 | */ | |
366 | int | |
367 | xfs_bumplink( | |
368 | xfs_trans_t *tp, | |
369 | xfs_inode_t *ip) | |
370 | { | |
371 | if (ip->i_d.di_nlink >= XFS_MAXLINK) | |
372 | return XFS_ERROR(EMLINK); | |
373 | xfs_ichgtime(ip, XFS_ICHGTIME_CHG); | |
374 | ||
375 | ASSERT(ip->i_d.di_nlink > 0); | |
376 | ip->i_d.di_nlink++; | |
377 | if ((ip->i_d.di_version == XFS_DINODE_VERSION_1) && | |
378 | (ip->i_d.di_nlink > XFS_MAXLINK_1)) { | |
379 | /* | |
380 | * The inode has increased its number of links beyond | |
381 | * what can fit in an old format inode. It now needs | |
382 | * to be converted to a version 2 inode with a 32 bit | |
383 | * link count. If this is the first inode in the file | |
384 | * system to do this, then we need to bump the superblock | |
385 | * version number as well. | |
386 | */ | |
387 | xfs_bump_ino_vers2(tp, ip); | |
388 | } | |
389 | ||
390 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
391 | return 0; | |
392 | } | |
393 | ||
394 | /* | |
395 | * Try to truncate the given file to 0 length. Currently called | |
396 | * only out of xfs_remove when it has to truncate a file to free | |
397 | * up space for the remove to proceed. | |
398 | */ | |
399 | int | |
400 | xfs_truncate_file( | |
401 | xfs_mount_t *mp, | |
402 | xfs_inode_t *ip) | |
403 | { | |
404 | xfs_trans_t *tp; | |
405 | int error; | |
406 | ||
407 | #ifdef QUOTADEBUG | |
408 | /* | |
409 | * This is called to truncate the quotainodes too. | |
410 | */ | |
411 | if (XFS_IS_UQUOTA_ON(mp)) { | |
412 | if (ip->i_ino != mp->m_sb.sb_uquotino) | |
413 | ASSERT(ip->i_udquot); | |
414 | } | |
c8ad20ff | 415 | if (XFS_IS_OQUOTA_ON(mp)) { |
1da177e4 LT |
416 | if (ip->i_ino != mp->m_sb.sb_gquotino) |
417 | ASSERT(ip->i_gdquot); | |
418 | } | |
419 | #endif | |
420 | /* | |
421 | * Make the call to xfs_itruncate_start before starting the | |
422 | * transaction, because we cannot make the call while we're | |
423 | * in a transaction. | |
424 | */ | |
425 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
426 | xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, (xfs_fsize_t)0); | |
427 | ||
428 | tp = xfs_trans_alloc(mp, XFS_TRANS_TRUNCATE_FILE); | |
429 | if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, | |
430 | XFS_TRANS_PERM_LOG_RES, | |
431 | XFS_ITRUNCATE_LOG_COUNT))) { | |
432 | xfs_trans_cancel(tp, 0); | |
433 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
434 | return error; | |
435 | } | |
436 | ||
437 | /* | |
438 | * Follow the normal truncate locking protocol. Since we | |
439 | * hold the inode in the transaction, we know that it's number | |
440 | * of references will stay constant. | |
441 | */ | |
442 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
443 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
444 | xfs_trans_ihold(tp, ip); | |
445 | /* | |
446 | * Signal a sync xaction. The only case where that isn't | |
447 | * the case is if we're truncating an already unlinked file | |
448 | * on a wsync fs. In that case, we know the blocks can't | |
449 | * reappear in the file because the links to file are | |
450 | * permanently toast. Currently, we're always going to | |
451 | * want a sync transaction because this code is being | |
452 | * called from places where nlink is guaranteed to be 1 | |
453 | * but I'm leaving the tests in to protect against future | |
454 | * changes -- rcc. | |
455 | */ | |
456 | error = xfs_itruncate_finish(&tp, ip, (xfs_fsize_t)0, | |
457 | XFS_DATA_FORK, | |
458 | ((ip->i_d.di_nlink != 0 || | |
459 | !(mp->m_flags & XFS_MOUNT_WSYNC)) | |
460 | ? 1 : 0)); | |
461 | if (error) { | |
462 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | | |
463 | XFS_TRANS_ABORT); | |
464 | } else { | |
465 | xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
466 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, | |
467 | NULL); | |
468 | } | |
469 | xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
470 | ||
471 | return error; | |
472 | } |