Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
3e57ecf6 | 2 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
7b718769 | 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 | */ |
40ebd81d RD |
18 | #include <linux/log2.h> |
19 | ||
1da177e4 | 20 | #include "xfs.h" |
a844f451 | 21 | #include "xfs_fs.h" |
70a9883c | 22 | #include "xfs_shared.h" |
239880ef DC |
23 | #include "xfs_format.h" |
24 | #include "xfs_log_format.h" | |
25 | #include "xfs_trans_resv.h" | |
1da177e4 | 26 | #include "xfs_sb.h" |
1da177e4 | 27 | #include "xfs_mount.h" |
a4fbe6ab | 28 | #include "xfs_inode.h" |
57062787 | 29 | #include "xfs_da_format.h" |
c24b5dfa | 30 | #include "xfs_da_btree.h" |
c24b5dfa | 31 | #include "xfs_dir2.h" |
a844f451 | 32 | #include "xfs_attr_sf.h" |
c24b5dfa | 33 | #include "xfs_attr.h" |
239880ef DC |
34 | #include "xfs_trans_space.h" |
35 | #include "xfs_trans.h" | |
1da177e4 | 36 | #include "xfs_buf_item.h" |
a844f451 | 37 | #include "xfs_inode_item.h" |
a844f451 NS |
38 | #include "xfs_ialloc.h" |
39 | #include "xfs_bmap.h" | |
68988114 | 40 | #include "xfs_bmap_util.h" |
1da177e4 | 41 | #include "xfs_error.h" |
1da177e4 | 42 | #include "xfs_quota.h" |
2a82b8be | 43 | #include "xfs_filestream.h" |
93848a99 | 44 | #include "xfs_cksum.h" |
0b1b213f | 45 | #include "xfs_trace.h" |
33479e05 | 46 | #include "xfs_icache.h" |
c24b5dfa | 47 | #include "xfs_symlink.h" |
239880ef DC |
48 | #include "xfs_trans_priv.h" |
49 | #include "xfs_log.h" | |
a4fbe6ab | 50 | #include "xfs_bmap_btree.h" |
1da177e4 | 51 | |
1da177e4 | 52 | kmem_zone_t *xfs_inode_zone; |
1da177e4 LT |
53 | |
54 | /* | |
8f04c47a | 55 | * Used in xfs_itruncate_extents(). This is the maximum number of extents |
1da177e4 LT |
56 | * freed from a file in a single transaction. |
57 | */ | |
58 | #define XFS_ITRUNC_MAX_EXTENTS 2 | |
59 | ||
60 | STATIC int xfs_iflush_int(xfs_inode_t *, xfs_buf_t *); | |
1da177e4 | 61 | |
ab297431 ZYW |
62 | STATIC int xfs_iunlink_remove(xfs_trans_t *, xfs_inode_t *); |
63 | ||
2a0ec1d9 DC |
64 | /* |
65 | * helper function to extract extent size hint from inode | |
66 | */ | |
67 | xfs_extlen_t | |
68 | xfs_get_extsz_hint( | |
69 | struct xfs_inode *ip) | |
70 | { | |
71 | if ((ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE) && ip->i_d.di_extsize) | |
72 | return ip->i_d.di_extsize; | |
73 | if (XFS_IS_REALTIME_INODE(ip)) | |
74 | return ip->i_mount->m_sb.sb_rextsize; | |
75 | return 0; | |
76 | } | |
77 | ||
fa96acad | 78 | /* |
efa70be1 CH |
79 | * These two are wrapper routines around the xfs_ilock() routine used to |
80 | * centralize some grungy code. They are used in places that wish to lock the | |
81 | * inode solely for reading the extents. The reason these places can't just | |
82 | * call xfs_ilock(ip, XFS_ILOCK_SHARED) is that the inode lock also guards to | |
83 | * bringing in of the extents from disk for a file in b-tree format. If the | |
84 | * inode is in b-tree format, then we need to lock the inode exclusively until | |
85 | * the extents are read in. Locking it exclusively all the time would limit | |
86 | * our parallelism unnecessarily, though. What we do instead is check to see | |
87 | * if the extents have been read in yet, and only lock the inode exclusively | |
88 | * if they have not. | |
fa96acad | 89 | * |
efa70be1 | 90 | * The functions return a value which should be given to the corresponding |
01f4f327 | 91 | * xfs_iunlock() call. |
fa96acad DC |
92 | */ |
93 | uint | |
309ecac8 CH |
94 | xfs_ilock_data_map_shared( |
95 | struct xfs_inode *ip) | |
fa96acad | 96 | { |
309ecac8 | 97 | uint lock_mode = XFS_ILOCK_SHARED; |
fa96acad | 98 | |
309ecac8 CH |
99 | if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE && |
100 | (ip->i_df.if_flags & XFS_IFEXTENTS) == 0) | |
fa96acad | 101 | lock_mode = XFS_ILOCK_EXCL; |
fa96acad | 102 | xfs_ilock(ip, lock_mode); |
fa96acad DC |
103 | return lock_mode; |
104 | } | |
105 | ||
efa70be1 CH |
106 | uint |
107 | xfs_ilock_attr_map_shared( | |
108 | struct xfs_inode *ip) | |
fa96acad | 109 | { |
efa70be1 CH |
110 | uint lock_mode = XFS_ILOCK_SHARED; |
111 | ||
112 | if (ip->i_d.di_aformat == XFS_DINODE_FMT_BTREE && | |
113 | (ip->i_afp->if_flags & XFS_IFEXTENTS) == 0) | |
114 | lock_mode = XFS_ILOCK_EXCL; | |
115 | xfs_ilock(ip, lock_mode); | |
116 | return lock_mode; | |
fa96acad DC |
117 | } |
118 | ||
119 | /* | |
120 | * The xfs inode contains 2 locks: a multi-reader lock called the | |
121 | * i_iolock and a multi-reader lock called the i_lock. This routine | |
122 | * allows either or both of the locks to be obtained. | |
123 | * | |
124 | * The 2 locks should always be ordered so that the IO lock is | |
125 | * obtained first in order to prevent deadlock. | |
126 | * | |
127 | * ip -- the inode being locked | |
128 | * lock_flags -- this parameter indicates the inode's locks | |
129 | * to be locked. It can be: | |
130 | * XFS_IOLOCK_SHARED, | |
131 | * XFS_IOLOCK_EXCL, | |
132 | * XFS_ILOCK_SHARED, | |
133 | * XFS_ILOCK_EXCL, | |
134 | * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED, | |
135 | * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL, | |
136 | * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED, | |
137 | * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL | |
138 | */ | |
139 | void | |
140 | xfs_ilock( | |
141 | xfs_inode_t *ip, | |
142 | uint lock_flags) | |
143 | { | |
144 | trace_xfs_ilock(ip, lock_flags, _RET_IP_); | |
145 | ||
146 | /* | |
147 | * You can't set both SHARED and EXCL for the same lock, | |
148 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
149 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
150 | */ | |
151 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
152 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
153 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != | |
154 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
155 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); | |
156 | ||
157 | if (lock_flags & XFS_IOLOCK_EXCL) | |
158 | mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags)); | |
159 | else if (lock_flags & XFS_IOLOCK_SHARED) | |
160 | mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags)); | |
161 | ||
162 | if (lock_flags & XFS_ILOCK_EXCL) | |
163 | mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags)); | |
164 | else if (lock_flags & XFS_ILOCK_SHARED) | |
165 | mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags)); | |
166 | } | |
167 | ||
168 | /* | |
169 | * This is just like xfs_ilock(), except that the caller | |
170 | * is guaranteed not to sleep. It returns 1 if it gets | |
171 | * the requested locks and 0 otherwise. If the IO lock is | |
172 | * obtained but the inode lock cannot be, then the IO lock | |
173 | * is dropped before returning. | |
174 | * | |
175 | * ip -- the inode being locked | |
176 | * lock_flags -- this parameter indicates the inode's locks to be | |
177 | * to be locked. See the comment for xfs_ilock() for a list | |
178 | * of valid values. | |
179 | */ | |
180 | int | |
181 | xfs_ilock_nowait( | |
182 | xfs_inode_t *ip, | |
183 | uint lock_flags) | |
184 | { | |
185 | trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_); | |
186 | ||
187 | /* | |
188 | * You can't set both SHARED and EXCL for the same lock, | |
189 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
190 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
191 | */ | |
192 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
193 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
194 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != | |
195 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
196 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); | |
197 | ||
198 | if (lock_flags & XFS_IOLOCK_EXCL) { | |
199 | if (!mrtryupdate(&ip->i_iolock)) | |
200 | goto out; | |
201 | } else if (lock_flags & XFS_IOLOCK_SHARED) { | |
202 | if (!mrtryaccess(&ip->i_iolock)) | |
203 | goto out; | |
204 | } | |
205 | if (lock_flags & XFS_ILOCK_EXCL) { | |
206 | if (!mrtryupdate(&ip->i_lock)) | |
207 | goto out_undo_iolock; | |
208 | } else if (lock_flags & XFS_ILOCK_SHARED) { | |
209 | if (!mrtryaccess(&ip->i_lock)) | |
210 | goto out_undo_iolock; | |
211 | } | |
212 | return 1; | |
213 | ||
214 | out_undo_iolock: | |
215 | if (lock_flags & XFS_IOLOCK_EXCL) | |
216 | mrunlock_excl(&ip->i_iolock); | |
217 | else if (lock_flags & XFS_IOLOCK_SHARED) | |
218 | mrunlock_shared(&ip->i_iolock); | |
219 | out: | |
220 | return 0; | |
221 | } | |
222 | ||
223 | /* | |
224 | * xfs_iunlock() is used to drop the inode locks acquired with | |
225 | * xfs_ilock() and xfs_ilock_nowait(). The caller must pass | |
226 | * in the flags given to xfs_ilock() or xfs_ilock_nowait() so | |
227 | * that we know which locks to drop. | |
228 | * | |
229 | * ip -- the inode being unlocked | |
230 | * lock_flags -- this parameter indicates the inode's locks to be | |
231 | * to be unlocked. See the comment for xfs_ilock() for a list | |
232 | * of valid values for this parameter. | |
233 | * | |
234 | */ | |
235 | void | |
236 | xfs_iunlock( | |
237 | xfs_inode_t *ip, | |
238 | uint lock_flags) | |
239 | { | |
240 | /* | |
241 | * You can't set both SHARED and EXCL for the same lock, | |
242 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
243 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
244 | */ | |
245 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
246 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
247 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != | |
248 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
249 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); | |
250 | ASSERT(lock_flags != 0); | |
251 | ||
252 | if (lock_flags & XFS_IOLOCK_EXCL) | |
253 | mrunlock_excl(&ip->i_iolock); | |
254 | else if (lock_flags & XFS_IOLOCK_SHARED) | |
255 | mrunlock_shared(&ip->i_iolock); | |
256 | ||
257 | if (lock_flags & XFS_ILOCK_EXCL) | |
258 | mrunlock_excl(&ip->i_lock); | |
259 | else if (lock_flags & XFS_ILOCK_SHARED) | |
260 | mrunlock_shared(&ip->i_lock); | |
261 | ||
262 | trace_xfs_iunlock(ip, lock_flags, _RET_IP_); | |
263 | } | |
264 | ||
265 | /* | |
266 | * give up write locks. the i/o lock cannot be held nested | |
267 | * if it is being demoted. | |
268 | */ | |
269 | void | |
270 | xfs_ilock_demote( | |
271 | xfs_inode_t *ip, | |
272 | uint lock_flags) | |
273 | { | |
274 | ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)); | |
275 | ASSERT((lock_flags & ~(XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)) == 0); | |
276 | ||
277 | if (lock_flags & XFS_ILOCK_EXCL) | |
278 | mrdemote(&ip->i_lock); | |
279 | if (lock_flags & XFS_IOLOCK_EXCL) | |
280 | mrdemote(&ip->i_iolock); | |
281 | ||
282 | trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_); | |
283 | } | |
284 | ||
742ae1e3 | 285 | #if defined(DEBUG) || defined(XFS_WARN) |
fa96acad DC |
286 | int |
287 | xfs_isilocked( | |
288 | xfs_inode_t *ip, | |
289 | uint lock_flags) | |
290 | { | |
291 | if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) { | |
292 | if (!(lock_flags & XFS_ILOCK_SHARED)) | |
293 | return !!ip->i_lock.mr_writer; | |
294 | return rwsem_is_locked(&ip->i_lock.mr_lock); | |
295 | } | |
296 | ||
297 | if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) { | |
298 | if (!(lock_flags & XFS_IOLOCK_SHARED)) | |
299 | return !!ip->i_iolock.mr_writer; | |
300 | return rwsem_is_locked(&ip->i_iolock.mr_lock); | |
301 | } | |
302 | ||
303 | ASSERT(0); | |
304 | return 0; | |
305 | } | |
306 | #endif | |
307 | ||
c24b5dfa DC |
308 | #ifdef DEBUG |
309 | int xfs_locked_n; | |
310 | int xfs_small_retries; | |
311 | int xfs_middle_retries; | |
312 | int xfs_lots_retries; | |
313 | int xfs_lock_delays; | |
314 | #endif | |
315 | ||
316 | /* | |
317 | * Bump the subclass so xfs_lock_inodes() acquires each lock with | |
318 | * a different value | |
319 | */ | |
320 | static inline int | |
321 | xfs_lock_inumorder(int lock_mode, int subclass) | |
322 | { | |
323 | if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) | |
324 | lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT; | |
325 | if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) | |
326 | lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT; | |
327 | ||
328 | return lock_mode; | |
329 | } | |
330 | ||
331 | /* | |
95afcf5c DC |
332 | * The following routine will lock n inodes in exclusive mode. We assume the |
333 | * caller calls us with the inodes in i_ino order. | |
c24b5dfa | 334 | * |
95afcf5c DC |
335 | * We need to detect deadlock where an inode that we lock is in the AIL and we |
336 | * start waiting for another inode that is locked by a thread in a long running | |
337 | * transaction (such as truncate). This can result in deadlock since the long | |
338 | * running trans might need to wait for the inode we just locked in order to | |
339 | * push the tail and free space in the log. | |
c24b5dfa DC |
340 | */ |
341 | void | |
342 | xfs_lock_inodes( | |
343 | xfs_inode_t **ips, | |
344 | int inodes, | |
345 | uint lock_mode) | |
346 | { | |
347 | int attempts = 0, i, j, try_lock; | |
348 | xfs_log_item_t *lp; | |
349 | ||
95afcf5c DC |
350 | /* currently supports between 2 and 5 inodes */ |
351 | ASSERT(ips && inodes >= 2 && inodes <= 5); | |
c24b5dfa DC |
352 | |
353 | try_lock = 0; | |
354 | i = 0; | |
c24b5dfa DC |
355 | again: |
356 | for (; i < inodes; i++) { | |
357 | ASSERT(ips[i]); | |
358 | ||
95afcf5c | 359 | if (i && (ips[i] == ips[i - 1])) /* Already locked */ |
c24b5dfa DC |
360 | continue; |
361 | ||
362 | /* | |
95afcf5c DC |
363 | * If try_lock is not set yet, make sure all locked inodes are |
364 | * not in the AIL. If any are, set try_lock to be used later. | |
c24b5dfa | 365 | */ |
c24b5dfa DC |
366 | if (!try_lock) { |
367 | for (j = (i - 1); j >= 0 && !try_lock; j--) { | |
368 | lp = (xfs_log_item_t *)ips[j]->i_itemp; | |
95afcf5c | 369 | if (lp && (lp->li_flags & XFS_LI_IN_AIL)) |
c24b5dfa | 370 | try_lock++; |
c24b5dfa DC |
371 | } |
372 | } | |
373 | ||
374 | /* | |
375 | * If any of the previous locks we have locked is in the AIL, | |
376 | * we must TRY to get the second and subsequent locks. If | |
377 | * we can't get any, we must release all we have | |
378 | * and try again. | |
379 | */ | |
95afcf5c DC |
380 | if (!try_lock) { |
381 | xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i)); | |
382 | continue; | |
383 | } | |
384 | ||
385 | /* try_lock means we have an inode locked that is in the AIL. */ | |
386 | ASSERT(i != 0); | |
387 | if (xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) | |
388 | continue; | |
c24b5dfa | 389 | |
95afcf5c DC |
390 | /* |
391 | * Unlock all previous guys and try again. xfs_iunlock will try | |
392 | * to push the tail if the inode is in the AIL. | |
393 | */ | |
394 | attempts++; | |
395 | for (j = i - 1; j >= 0; j--) { | |
c24b5dfa | 396 | /* |
95afcf5c DC |
397 | * Check to see if we've already unlocked this one. Not |
398 | * the first one going back, and the inode ptr is the | |
399 | * same. | |
c24b5dfa | 400 | */ |
95afcf5c DC |
401 | if (j != (i - 1) && ips[j] == ips[j + 1]) |
402 | continue; | |
403 | ||
404 | xfs_iunlock(ips[j], lock_mode); | |
405 | } | |
c24b5dfa | 406 | |
95afcf5c DC |
407 | if ((attempts % 5) == 0) { |
408 | delay(1); /* Don't just spin the CPU */ | |
c24b5dfa | 409 | #ifdef DEBUG |
95afcf5c | 410 | xfs_lock_delays++; |
c24b5dfa | 411 | #endif |
c24b5dfa | 412 | } |
95afcf5c DC |
413 | i = 0; |
414 | try_lock = 0; | |
415 | goto again; | |
c24b5dfa DC |
416 | } |
417 | ||
418 | #ifdef DEBUG | |
419 | if (attempts) { | |
420 | if (attempts < 5) xfs_small_retries++; | |
421 | else if (attempts < 100) xfs_middle_retries++; | |
422 | else xfs_lots_retries++; | |
423 | } else { | |
424 | xfs_locked_n++; | |
425 | } | |
426 | #endif | |
427 | } | |
428 | ||
429 | /* | |
430 | * xfs_lock_two_inodes() can only be used to lock one type of lock | |
431 | * at a time - the iolock or the ilock, but not both at once. If | |
432 | * we lock both at once, lockdep will report false positives saying | |
433 | * we have violated locking orders. | |
434 | */ | |
435 | void | |
436 | xfs_lock_two_inodes( | |
437 | xfs_inode_t *ip0, | |
438 | xfs_inode_t *ip1, | |
439 | uint lock_mode) | |
440 | { | |
441 | xfs_inode_t *temp; | |
442 | int attempts = 0; | |
443 | xfs_log_item_t *lp; | |
444 | ||
445 | if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) | |
446 | ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0); | |
447 | ASSERT(ip0->i_ino != ip1->i_ino); | |
448 | ||
449 | if (ip0->i_ino > ip1->i_ino) { | |
450 | temp = ip0; | |
451 | ip0 = ip1; | |
452 | ip1 = temp; | |
453 | } | |
454 | ||
455 | again: | |
456 | xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0)); | |
457 | ||
458 | /* | |
459 | * If the first lock we have locked is in the AIL, we must TRY to get | |
460 | * the second lock. If we can't get it, we must release the first one | |
461 | * and try again. | |
462 | */ | |
463 | lp = (xfs_log_item_t *)ip0->i_itemp; | |
464 | if (lp && (lp->li_flags & XFS_LI_IN_AIL)) { | |
465 | if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) { | |
466 | xfs_iunlock(ip0, lock_mode); | |
467 | if ((++attempts % 5) == 0) | |
468 | delay(1); /* Don't just spin the CPU */ | |
469 | goto again; | |
470 | } | |
471 | } else { | |
472 | xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1)); | |
473 | } | |
474 | } | |
475 | ||
476 | ||
fa96acad DC |
477 | void |
478 | __xfs_iflock( | |
479 | struct xfs_inode *ip) | |
480 | { | |
481 | wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IFLOCK_BIT); | |
482 | DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IFLOCK_BIT); | |
483 | ||
484 | do { | |
485 | prepare_to_wait_exclusive(wq, &wait.wait, TASK_UNINTERRUPTIBLE); | |
486 | if (xfs_isiflocked(ip)) | |
487 | io_schedule(); | |
488 | } while (!xfs_iflock_nowait(ip)); | |
489 | ||
490 | finish_wait(wq, &wait.wait); | |
491 | } | |
492 | ||
1da177e4 LT |
493 | STATIC uint |
494 | _xfs_dic2xflags( | |
1da177e4 LT |
495 | __uint16_t di_flags) |
496 | { | |
497 | uint flags = 0; | |
498 | ||
499 | if (di_flags & XFS_DIFLAG_ANY) { | |
500 | if (di_flags & XFS_DIFLAG_REALTIME) | |
501 | flags |= XFS_XFLAG_REALTIME; | |
502 | if (di_flags & XFS_DIFLAG_PREALLOC) | |
503 | flags |= XFS_XFLAG_PREALLOC; | |
504 | if (di_flags & XFS_DIFLAG_IMMUTABLE) | |
505 | flags |= XFS_XFLAG_IMMUTABLE; | |
506 | if (di_flags & XFS_DIFLAG_APPEND) | |
507 | flags |= XFS_XFLAG_APPEND; | |
508 | if (di_flags & XFS_DIFLAG_SYNC) | |
509 | flags |= XFS_XFLAG_SYNC; | |
510 | if (di_flags & XFS_DIFLAG_NOATIME) | |
511 | flags |= XFS_XFLAG_NOATIME; | |
512 | if (di_flags & XFS_DIFLAG_NODUMP) | |
513 | flags |= XFS_XFLAG_NODUMP; | |
514 | if (di_flags & XFS_DIFLAG_RTINHERIT) | |
515 | flags |= XFS_XFLAG_RTINHERIT; | |
516 | if (di_flags & XFS_DIFLAG_PROJINHERIT) | |
517 | flags |= XFS_XFLAG_PROJINHERIT; | |
518 | if (di_flags & XFS_DIFLAG_NOSYMLINKS) | |
519 | flags |= XFS_XFLAG_NOSYMLINKS; | |
dd9f438e NS |
520 | if (di_flags & XFS_DIFLAG_EXTSIZE) |
521 | flags |= XFS_XFLAG_EXTSIZE; | |
522 | if (di_flags & XFS_DIFLAG_EXTSZINHERIT) | |
523 | flags |= XFS_XFLAG_EXTSZINHERIT; | |
d3446eac BN |
524 | if (di_flags & XFS_DIFLAG_NODEFRAG) |
525 | flags |= XFS_XFLAG_NODEFRAG; | |
2a82b8be DC |
526 | if (di_flags & XFS_DIFLAG_FILESTREAM) |
527 | flags |= XFS_XFLAG_FILESTREAM; | |
1da177e4 LT |
528 | } |
529 | ||
530 | return flags; | |
531 | } | |
532 | ||
533 | uint | |
534 | xfs_ip2xflags( | |
535 | xfs_inode_t *ip) | |
536 | { | |
347d1c01 | 537 | xfs_icdinode_t *dic = &ip->i_d; |
1da177e4 | 538 | |
a916e2bd | 539 | return _xfs_dic2xflags(dic->di_flags) | |
45ba598e | 540 | (XFS_IFORK_Q(ip) ? XFS_XFLAG_HASATTR : 0); |
1da177e4 LT |
541 | } |
542 | ||
543 | uint | |
544 | xfs_dic2xflags( | |
45ba598e | 545 | xfs_dinode_t *dip) |
1da177e4 | 546 | { |
81591fe2 | 547 | return _xfs_dic2xflags(be16_to_cpu(dip->di_flags)) | |
45ba598e | 548 | (XFS_DFORK_Q(dip) ? XFS_XFLAG_HASATTR : 0); |
1da177e4 LT |
549 | } |
550 | ||
c24b5dfa DC |
551 | /* |
552 | * Lookups up an inode from "name". If ci_name is not NULL, then a CI match | |
553 | * is allowed, otherwise it has to be an exact match. If a CI match is found, | |
554 | * ci_name->name will point to a the actual name (caller must free) or | |
555 | * will be set to NULL if an exact match is found. | |
556 | */ | |
557 | int | |
558 | xfs_lookup( | |
559 | xfs_inode_t *dp, | |
560 | struct xfs_name *name, | |
561 | xfs_inode_t **ipp, | |
562 | struct xfs_name *ci_name) | |
563 | { | |
564 | xfs_ino_t inum; | |
565 | int error; | |
566 | uint lock_mode; | |
567 | ||
568 | trace_xfs_lookup(dp, name); | |
569 | ||
570 | if (XFS_FORCED_SHUTDOWN(dp->i_mount)) | |
2451337d | 571 | return -EIO; |
c24b5dfa | 572 | |
309ecac8 | 573 | lock_mode = xfs_ilock_data_map_shared(dp); |
c24b5dfa | 574 | error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name); |
01f4f327 | 575 | xfs_iunlock(dp, lock_mode); |
c24b5dfa DC |
576 | |
577 | if (error) | |
578 | goto out; | |
579 | ||
580 | error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp); | |
581 | if (error) | |
582 | goto out_free_name; | |
583 | ||
584 | return 0; | |
585 | ||
586 | out_free_name: | |
587 | if (ci_name) | |
588 | kmem_free(ci_name->name); | |
589 | out: | |
590 | *ipp = NULL; | |
591 | return error; | |
592 | } | |
593 | ||
1da177e4 LT |
594 | /* |
595 | * Allocate an inode on disk and return a copy of its in-core version. | |
596 | * The in-core inode is locked exclusively. Set mode, nlink, and rdev | |
597 | * appropriately within the inode. The uid and gid for the inode are | |
598 | * set according to the contents of the given cred structure. | |
599 | * | |
600 | * Use xfs_dialloc() to allocate the on-disk inode. If xfs_dialloc() | |
cd856db6 CM |
601 | * has a free inode available, call xfs_iget() to obtain the in-core |
602 | * version of the allocated inode. Finally, fill in the inode and | |
603 | * log its initial contents. In this case, ialloc_context would be | |
604 | * set to NULL. | |
1da177e4 | 605 | * |
cd856db6 CM |
606 | * If xfs_dialloc() does not have an available inode, it will replenish |
607 | * its supply by doing an allocation. Since we can only do one | |
608 | * allocation within a transaction without deadlocks, we must commit | |
609 | * the current transaction before returning the inode itself. | |
610 | * In this case, therefore, we will set ialloc_context and return. | |
1da177e4 LT |
611 | * The caller should then commit the current transaction, start a new |
612 | * transaction, and call xfs_ialloc() again to actually get the inode. | |
613 | * | |
614 | * To ensure that some other process does not grab the inode that | |
615 | * was allocated during the first call to xfs_ialloc(), this routine | |
616 | * also returns the [locked] bp pointing to the head of the freelist | |
617 | * as ialloc_context. The caller should hold this buffer across | |
618 | * the commit and pass it back into this routine on the second call. | |
b11f94d5 DC |
619 | * |
620 | * If we are allocating quota inodes, we do not have a parent inode | |
621 | * to attach to or associate with (i.e. pip == NULL) because they | |
622 | * are not linked into the directory structure - they are attached | |
623 | * directly to the superblock - and so have no parent. | |
1da177e4 LT |
624 | */ |
625 | int | |
626 | xfs_ialloc( | |
627 | xfs_trans_t *tp, | |
628 | xfs_inode_t *pip, | |
576b1d67 | 629 | umode_t mode, |
31b084ae | 630 | xfs_nlink_t nlink, |
1da177e4 | 631 | xfs_dev_t rdev, |
6743099c | 632 | prid_t prid, |
1da177e4 LT |
633 | int okalloc, |
634 | xfs_buf_t **ialloc_context, | |
1da177e4 LT |
635 | xfs_inode_t **ipp) |
636 | { | |
93848a99 | 637 | struct xfs_mount *mp = tp->t_mountp; |
1da177e4 LT |
638 | xfs_ino_t ino; |
639 | xfs_inode_t *ip; | |
1da177e4 LT |
640 | uint flags; |
641 | int error; | |
e076b0f3 | 642 | struct timespec tv; |
1da177e4 LT |
643 | |
644 | /* | |
645 | * Call the space management code to pick | |
646 | * the on-disk inode to be allocated. | |
647 | */ | |
b11f94d5 | 648 | error = xfs_dialloc(tp, pip ? pip->i_ino : 0, mode, okalloc, |
08358906 | 649 | ialloc_context, &ino); |
bf904248 | 650 | if (error) |
1da177e4 | 651 | return error; |
08358906 | 652 | if (*ialloc_context || ino == NULLFSINO) { |
1da177e4 LT |
653 | *ipp = NULL; |
654 | return 0; | |
655 | } | |
656 | ASSERT(*ialloc_context == NULL); | |
657 | ||
658 | /* | |
659 | * Get the in-core inode with the lock held exclusively. | |
660 | * This is because we're setting fields here we need | |
661 | * to prevent others from looking at until we're done. | |
662 | */ | |
93848a99 | 663 | error = xfs_iget(mp, tp, ino, XFS_IGET_CREATE, |
ec3ba85f | 664 | XFS_ILOCK_EXCL, &ip); |
bf904248 | 665 | if (error) |
1da177e4 | 666 | return error; |
1da177e4 LT |
667 | ASSERT(ip != NULL); |
668 | ||
263997a6 DC |
669 | /* |
670 | * We always convert v1 inodes to v2 now - we only support filesystems | |
671 | * with >= v2 inode capability, so there is no reason for ever leaving | |
672 | * an inode in v1 format. | |
673 | */ | |
674 | if (ip->i_d.di_version == 1) | |
675 | ip->i_d.di_version = 2; | |
676 | ||
576b1d67 | 677 | ip->i_d.di_mode = mode; |
1da177e4 LT |
678 | ip->i_d.di_onlink = 0; |
679 | ip->i_d.di_nlink = nlink; | |
680 | ASSERT(ip->i_d.di_nlink == nlink); | |
7aab1b28 DE |
681 | ip->i_d.di_uid = xfs_kuid_to_uid(current_fsuid()); |
682 | ip->i_d.di_gid = xfs_kgid_to_gid(current_fsgid()); | |
6743099c | 683 | xfs_set_projid(ip, prid); |
1da177e4 LT |
684 | memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad)); |
685 | ||
bd186aa9 | 686 | if (pip && XFS_INHERIT_GID(pip)) { |
1da177e4 | 687 | ip->i_d.di_gid = pip->i_d.di_gid; |
abbede1b | 688 | if ((pip->i_d.di_mode & S_ISGID) && S_ISDIR(mode)) { |
1da177e4 LT |
689 | ip->i_d.di_mode |= S_ISGID; |
690 | } | |
691 | } | |
692 | ||
693 | /* | |
694 | * If the group ID of the new file does not match the effective group | |
695 | * ID or one of the supplementary group IDs, the S_ISGID bit is cleared | |
696 | * (and only if the irix_sgid_inherit compatibility variable is set). | |
697 | */ | |
698 | if ((irix_sgid_inherit) && | |
699 | (ip->i_d.di_mode & S_ISGID) && | |
7aab1b28 | 700 | (!in_group_p(xfs_gid_to_kgid(ip->i_d.di_gid)))) { |
1da177e4 LT |
701 | ip->i_d.di_mode &= ~S_ISGID; |
702 | } | |
703 | ||
704 | ip->i_d.di_size = 0; | |
705 | ip->i_d.di_nextents = 0; | |
706 | ASSERT(ip->i_d.di_nblocks == 0); | |
dff35fd4 | 707 | |
e076b0f3 | 708 | tv = current_fs_time(mp->m_super); |
dff35fd4 CH |
709 | ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec; |
710 | ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec; | |
711 | ip->i_d.di_atime = ip->i_d.di_mtime; | |
712 | ip->i_d.di_ctime = ip->i_d.di_mtime; | |
713 | ||
1da177e4 LT |
714 | /* |
715 | * di_gen will have been taken care of in xfs_iread. | |
716 | */ | |
717 | ip->i_d.di_extsize = 0; | |
718 | ip->i_d.di_dmevmask = 0; | |
719 | ip->i_d.di_dmstate = 0; | |
720 | ip->i_d.di_flags = 0; | |
93848a99 CH |
721 | |
722 | if (ip->i_d.di_version == 3) { | |
723 | ASSERT(ip->i_d.di_ino == ino); | |
724 | ASSERT(uuid_equal(&ip->i_d.di_uuid, &mp->m_sb.sb_uuid)); | |
725 | ip->i_d.di_crc = 0; | |
726 | ip->i_d.di_changecount = 1; | |
727 | ip->i_d.di_lsn = 0; | |
728 | ip->i_d.di_flags2 = 0; | |
729 | memset(&(ip->i_d.di_pad2[0]), 0, sizeof(ip->i_d.di_pad2)); | |
730 | ip->i_d.di_crtime = ip->i_d.di_mtime; | |
731 | } | |
732 | ||
733 | ||
1da177e4 LT |
734 | flags = XFS_ILOG_CORE; |
735 | switch (mode & S_IFMT) { | |
736 | case S_IFIFO: | |
737 | case S_IFCHR: | |
738 | case S_IFBLK: | |
739 | case S_IFSOCK: | |
740 | ip->i_d.di_format = XFS_DINODE_FMT_DEV; | |
741 | ip->i_df.if_u2.if_rdev = rdev; | |
742 | ip->i_df.if_flags = 0; | |
743 | flags |= XFS_ILOG_DEV; | |
744 | break; | |
745 | case S_IFREG: | |
746 | case S_IFDIR: | |
b11f94d5 | 747 | if (pip && (pip->i_d.di_flags & XFS_DIFLAG_ANY)) { |
365ca83d NS |
748 | uint di_flags = 0; |
749 | ||
abbede1b | 750 | if (S_ISDIR(mode)) { |
365ca83d NS |
751 | if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT) |
752 | di_flags |= XFS_DIFLAG_RTINHERIT; | |
dd9f438e NS |
753 | if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) { |
754 | di_flags |= XFS_DIFLAG_EXTSZINHERIT; | |
755 | ip->i_d.di_extsize = pip->i_d.di_extsize; | |
756 | } | |
9336e3a7 DC |
757 | if (pip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) |
758 | di_flags |= XFS_DIFLAG_PROJINHERIT; | |
abbede1b | 759 | } else if (S_ISREG(mode)) { |
613d7043 | 760 | if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT) |
365ca83d | 761 | di_flags |= XFS_DIFLAG_REALTIME; |
dd9f438e NS |
762 | if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) { |
763 | di_flags |= XFS_DIFLAG_EXTSIZE; | |
764 | ip->i_d.di_extsize = pip->i_d.di_extsize; | |
765 | } | |
1da177e4 LT |
766 | } |
767 | if ((pip->i_d.di_flags & XFS_DIFLAG_NOATIME) && | |
768 | xfs_inherit_noatime) | |
365ca83d | 769 | di_flags |= XFS_DIFLAG_NOATIME; |
1da177e4 LT |
770 | if ((pip->i_d.di_flags & XFS_DIFLAG_NODUMP) && |
771 | xfs_inherit_nodump) | |
365ca83d | 772 | di_flags |= XFS_DIFLAG_NODUMP; |
1da177e4 LT |
773 | if ((pip->i_d.di_flags & XFS_DIFLAG_SYNC) && |
774 | xfs_inherit_sync) | |
365ca83d | 775 | di_flags |= XFS_DIFLAG_SYNC; |
1da177e4 LT |
776 | if ((pip->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) && |
777 | xfs_inherit_nosymlinks) | |
365ca83d | 778 | di_flags |= XFS_DIFLAG_NOSYMLINKS; |
d3446eac BN |
779 | if ((pip->i_d.di_flags & XFS_DIFLAG_NODEFRAG) && |
780 | xfs_inherit_nodefrag) | |
781 | di_flags |= XFS_DIFLAG_NODEFRAG; | |
2a82b8be DC |
782 | if (pip->i_d.di_flags & XFS_DIFLAG_FILESTREAM) |
783 | di_flags |= XFS_DIFLAG_FILESTREAM; | |
365ca83d | 784 | ip->i_d.di_flags |= di_flags; |
1da177e4 LT |
785 | } |
786 | /* FALLTHROUGH */ | |
787 | case S_IFLNK: | |
788 | ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS; | |
789 | ip->i_df.if_flags = XFS_IFEXTENTS; | |
790 | ip->i_df.if_bytes = ip->i_df.if_real_bytes = 0; | |
791 | ip->i_df.if_u1.if_extents = NULL; | |
792 | break; | |
793 | default: | |
794 | ASSERT(0); | |
795 | } | |
796 | /* | |
797 | * Attribute fork settings for new inode. | |
798 | */ | |
799 | ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS; | |
800 | ip->i_d.di_anextents = 0; | |
801 | ||
802 | /* | |
803 | * Log the new values stuffed into the inode. | |
804 | */ | |
ddc3415a | 805 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); |
1da177e4 LT |
806 | xfs_trans_log_inode(tp, ip, flags); |
807 | ||
58c90473 | 808 | /* now that we have an i_mode we can setup the inode structure */ |
41be8bed | 809 | xfs_setup_inode(ip); |
1da177e4 LT |
810 | |
811 | *ipp = ip; | |
812 | return 0; | |
813 | } | |
814 | ||
e546cb79 DC |
815 | /* |
816 | * Allocates a new inode from disk and return a pointer to the | |
817 | * incore copy. This routine will internally commit the current | |
818 | * transaction and allocate a new one if the Space Manager needed | |
819 | * to do an allocation to replenish the inode free-list. | |
820 | * | |
821 | * This routine is designed to be called from xfs_create and | |
822 | * xfs_create_dir. | |
823 | * | |
824 | */ | |
825 | int | |
826 | xfs_dir_ialloc( | |
827 | xfs_trans_t **tpp, /* input: current transaction; | |
828 | output: may be a new transaction. */ | |
829 | xfs_inode_t *dp, /* directory within whose allocate | |
830 | the inode. */ | |
831 | umode_t mode, | |
832 | xfs_nlink_t nlink, | |
833 | xfs_dev_t rdev, | |
834 | prid_t prid, /* project id */ | |
835 | int okalloc, /* ok to allocate new space */ | |
836 | xfs_inode_t **ipp, /* pointer to inode; it will be | |
837 | locked. */ | |
838 | int *committed) | |
839 | ||
840 | { | |
841 | xfs_trans_t *tp; | |
842 | xfs_trans_t *ntp; | |
843 | xfs_inode_t *ip; | |
844 | xfs_buf_t *ialloc_context = NULL; | |
845 | int code; | |
e546cb79 DC |
846 | void *dqinfo; |
847 | uint tflags; | |
848 | ||
849 | tp = *tpp; | |
850 | ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); | |
851 | ||
852 | /* | |
853 | * xfs_ialloc will return a pointer to an incore inode if | |
854 | * the Space Manager has an available inode on the free | |
855 | * list. Otherwise, it will do an allocation and replenish | |
856 | * the freelist. Since we can only do one allocation per | |
857 | * transaction without deadlocks, we will need to commit the | |
858 | * current transaction and start a new one. We will then | |
859 | * need to call xfs_ialloc again to get the inode. | |
860 | * | |
861 | * If xfs_ialloc did an allocation to replenish the freelist, | |
862 | * it returns the bp containing the head of the freelist as | |
863 | * ialloc_context. We will hold a lock on it across the | |
864 | * transaction commit so that no other process can steal | |
865 | * the inode(s) that we've just allocated. | |
866 | */ | |
867 | code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid, okalloc, | |
868 | &ialloc_context, &ip); | |
869 | ||
870 | /* | |
871 | * Return an error if we were unable to allocate a new inode. | |
872 | * This should only happen if we run out of space on disk or | |
873 | * encounter a disk error. | |
874 | */ | |
875 | if (code) { | |
876 | *ipp = NULL; | |
877 | return code; | |
878 | } | |
879 | if (!ialloc_context && !ip) { | |
880 | *ipp = NULL; | |
2451337d | 881 | return -ENOSPC; |
e546cb79 DC |
882 | } |
883 | ||
884 | /* | |
885 | * If the AGI buffer is non-NULL, then we were unable to get an | |
886 | * inode in one operation. We need to commit the current | |
887 | * transaction and call xfs_ialloc() again. It is guaranteed | |
888 | * to succeed the second time. | |
889 | */ | |
890 | if (ialloc_context) { | |
3d3c8b52 JL |
891 | struct xfs_trans_res tres; |
892 | ||
e546cb79 DC |
893 | /* |
894 | * Normally, xfs_trans_commit releases all the locks. | |
895 | * We call bhold to hang on to the ialloc_context across | |
896 | * the commit. Holding this buffer prevents any other | |
897 | * processes from doing any allocations in this | |
898 | * allocation group. | |
899 | */ | |
900 | xfs_trans_bhold(tp, ialloc_context); | |
901 | /* | |
902 | * Save the log reservation so we can use | |
903 | * them in the next transaction. | |
904 | */ | |
3d3c8b52 JL |
905 | tres.tr_logres = xfs_trans_get_log_res(tp); |
906 | tres.tr_logcount = xfs_trans_get_log_count(tp); | |
e546cb79 DC |
907 | |
908 | /* | |
909 | * We want the quota changes to be associated with the next | |
910 | * transaction, NOT this one. So, detach the dqinfo from this | |
911 | * and attach it to the next transaction. | |
912 | */ | |
913 | dqinfo = NULL; | |
914 | tflags = 0; | |
915 | if (tp->t_dqinfo) { | |
916 | dqinfo = (void *)tp->t_dqinfo; | |
917 | tp->t_dqinfo = NULL; | |
918 | tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY; | |
919 | tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY); | |
920 | } | |
921 | ||
922 | ntp = xfs_trans_dup(tp); | |
923 | code = xfs_trans_commit(tp, 0); | |
924 | tp = ntp; | |
925 | if (committed != NULL) { | |
926 | *committed = 1; | |
927 | } | |
928 | /* | |
929 | * If we get an error during the commit processing, | |
930 | * release the buffer that is still held and return | |
931 | * to the caller. | |
932 | */ | |
933 | if (code) { | |
934 | xfs_buf_relse(ialloc_context); | |
935 | if (dqinfo) { | |
936 | tp->t_dqinfo = dqinfo; | |
937 | xfs_trans_free_dqinfo(tp); | |
938 | } | |
939 | *tpp = ntp; | |
940 | *ipp = NULL; | |
941 | return code; | |
942 | } | |
943 | ||
944 | /* | |
945 | * transaction commit worked ok so we can drop the extra ticket | |
946 | * reference that we gained in xfs_trans_dup() | |
947 | */ | |
948 | xfs_log_ticket_put(tp->t_ticket); | |
3d3c8b52 JL |
949 | tres.tr_logflags = XFS_TRANS_PERM_LOG_RES; |
950 | code = xfs_trans_reserve(tp, &tres, 0, 0); | |
951 | ||
e546cb79 DC |
952 | /* |
953 | * Re-attach the quota info that we detached from prev trx. | |
954 | */ | |
955 | if (dqinfo) { | |
956 | tp->t_dqinfo = dqinfo; | |
957 | tp->t_flags |= tflags; | |
958 | } | |
959 | ||
960 | if (code) { | |
961 | xfs_buf_relse(ialloc_context); | |
962 | *tpp = ntp; | |
963 | *ipp = NULL; | |
964 | return code; | |
965 | } | |
966 | xfs_trans_bjoin(tp, ialloc_context); | |
967 | ||
968 | /* | |
969 | * Call ialloc again. Since we've locked out all | |
970 | * other allocations in this allocation group, | |
971 | * this call should always succeed. | |
972 | */ | |
973 | code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid, | |
974 | okalloc, &ialloc_context, &ip); | |
975 | ||
976 | /* | |
977 | * If we get an error at this point, return to the caller | |
978 | * so that the current transaction can be aborted. | |
979 | */ | |
980 | if (code) { | |
981 | *tpp = tp; | |
982 | *ipp = NULL; | |
983 | return code; | |
984 | } | |
985 | ASSERT(!ialloc_context && ip); | |
986 | ||
987 | } else { | |
988 | if (committed != NULL) | |
989 | *committed = 0; | |
990 | } | |
991 | ||
992 | *ipp = ip; | |
993 | *tpp = tp; | |
994 | ||
995 | return 0; | |
996 | } | |
997 | ||
998 | /* | |
999 | * Decrement the link count on an inode & log the change. | |
1000 | * If this causes the link count to go to zero, initiate the | |
1001 | * logging activity required to truncate a file. | |
1002 | */ | |
1003 | int /* error */ | |
1004 | xfs_droplink( | |
1005 | xfs_trans_t *tp, | |
1006 | xfs_inode_t *ip) | |
1007 | { | |
1008 | int error; | |
1009 | ||
1010 | xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG); | |
1011 | ||
1012 | ASSERT (ip->i_d.di_nlink > 0); | |
1013 | ip->i_d.di_nlink--; | |
1014 | drop_nlink(VFS_I(ip)); | |
1015 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
1016 | ||
1017 | error = 0; | |
1018 | if (ip->i_d.di_nlink == 0) { | |
1019 | /* | |
1020 | * We're dropping the last link to this file. | |
1021 | * Move the on-disk inode to the AGI unlinked list. | |
1022 | * From xfs_inactive() we will pull the inode from | |
1023 | * the list and free it. | |
1024 | */ | |
1025 | error = xfs_iunlink(tp, ip); | |
1026 | } | |
1027 | return error; | |
1028 | } | |
1029 | ||
e546cb79 DC |
1030 | /* |
1031 | * Increment the link count on an inode & log the change. | |
1032 | */ | |
1033 | int | |
1034 | xfs_bumplink( | |
1035 | xfs_trans_t *tp, | |
1036 | xfs_inode_t *ip) | |
1037 | { | |
1038 | xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG); | |
1039 | ||
263997a6 | 1040 | ASSERT(ip->i_d.di_version > 1); |
ab297431 | 1041 | ASSERT(ip->i_d.di_nlink > 0 || (VFS_I(ip)->i_state & I_LINKABLE)); |
e546cb79 DC |
1042 | ip->i_d.di_nlink++; |
1043 | inc_nlink(VFS_I(ip)); | |
e546cb79 DC |
1044 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
1045 | return 0; | |
1046 | } | |
1047 | ||
c24b5dfa DC |
1048 | int |
1049 | xfs_create( | |
1050 | xfs_inode_t *dp, | |
1051 | struct xfs_name *name, | |
1052 | umode_t mode, | |
1053 | xfs_dev_t rdev, | |
1054 | xfs_inode_t **ipp) | |
1055 | { | |
1056 | int is_dir = S_ISDIR(mode); | |
1057 | struct xfs_mount *mp = dp->i_mount; | |
1058 | struct xfs_inode *ip = NULL; | |
1059 | struct xfs_trans *tp = NULL; | |
1060 | int error; | |
1061 | xfs_bmap_free_t free_list; | |
1062 | xfs_fsblock_t first_block; | |
1063 | bool unlock_dp_on_error = false; | |
1064 | uint cancel_flags; | |
1065 | int committed; | |
1066 | prid_t prid; | |
1067 | struct xfs_dquot *udqp = NULL; | |
1068 | struct xfs_dquot *gdqp = NULL; | |
1069 | struct xfs_dquot *pdqp = NULL; | |
062647a8 | 1070 | struct xfs_trans_res *tres; |
c24b5dfa | 1071 | uint resblks; |
c24b5dfa DC |
1072 | |
1073 | trace_xfs_create(dp, name); | |
1074 | ||
1075 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2451337d | 1076 | return -EIO; |
c24b5dfa | 1077 | |
163467d3 | 1078 | prid = xfs_get_initial_prid(dp); |
c24b5dfa DC |
1079 | |
1080 | /* | |
1081 | * Make sure that we have allocated dquot(s) on disk. | |
1082 | */ | |
7aab1b28 DE |
1083 | error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()), |
1084 | xfs_kgid_to_gid(current_fsgid()), prid, | |
c24b5dfa DC |
1085 | XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, |
1086 | &udqp, &gdqp, &pdqp); | |
1087 | if (error) | |
1088 | return error; | |
1089 | ||
1090 | if (is_dir) { | |
1091 | rdev = 0; | |
1092 | resblks = XFS_MKDIR_SPACE_RES(mp, name->len); | |
062647a8 | 1093 | tres = &M_RES(mp)->tr_mkdir; |
c24b5dfa DC |
1094 | tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR); |
1095 | } else { | |
1096 | resblks = XFS_CREATE_SPACE_RES(mp, name->len); | |
062647a8 | 1097 | tres = &M_RES(mp)->tr_create; |
c24b5dfa DC |
1098 | tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE); |
1099 | } | |
1100 | ||
1101 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
1102 | ||
1103 | /* | |
1104 | * Initially assume that the file does not exist and | |
1105 | * reserve the resources for that case. If that is not | |
1106 | * the case we'll drop the one we have and get a more | |
1107 | * appropriate transaction later. | |
1108 | */ | |
062647a8 | 1109 | error = xfs_trans_reserve(tp, tres, resblks, 0); |
2451337d | 1110 | if (error == -ENOSPC) { |
c24b5dfa DC |
1111 | /* flush outstanding delalloc blocks and retry */ |
1112 | xfs_flush_inodes(mp); | |
062647a8 | 1113 | error = xfs_trans_reserve(tp, tres, resblks, 0); |
c24b5dfa | 1114 | } |
2451337d | 1115 | if (error == -ENOSPC) { |
c24b5dfa DC |
1116 | /* No space at all so try a "no-allocation" reservation */ |
1117 | resblks = 0; | |
062647a8 | 1118 | error = xfs_trans_reserve(tp, tres, 0, 0); |
c24b5dfa DC |
1119 | } |
1120 | if (error) { | |
1121 | cancel_flags = 0; | |
1122 | goto out_trans_cancel; | |
1123 | } | |
1124 | ||
1125 | xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT); | |
1126 | unlock_dp_on_error = true; | |
1127 | ||
1128 | xfs_bmap_init(&free_list, &first_block); | |
1129 | ||
1130 | /* | |
1131 | * Reserve disk quota and the inode. | |
1132 | */ | |
1133 | error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, | |
1134 | pdqp, resblks, 1, 0); | |
1135 | if (error) | |
1136 | goto out_trans_cancel; | |
1137 | ||
94f3cad5 ES |
1138 | if (!resblks) { |
1139 | error = xfs_dir_canenter(tp, dp, name); | |
1140 | if (error) | |
1141 | goto out_trans_cancel; | |
1142 | } | |
c24b5dfa DC |
1143 | |
1144 | /* | |
1145 | * A newly created regular or special file just has one directory | |
1146 | * entry pointing to them, but a directory also the "." entry | |
1147 | * pointing to itself. | |
1148 | */ | |
1149 | error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev, | |
1150 | prid, resblks > 0, &ip, &committed); | |
1151 | if (error) { | |
2451337d | 1152 | if (error == -ENOSPC) |
c24b5dfa DC |
1153 | goto out_trans_cancel; |
1154 | goto out_trans_abort; | |
1155 | } | |
1156 | ||
1157 | /* | |
1158 | * Now we join the directory inode to the transaction. We do not do it | |
1159 | * earlier because xfs_dir_ialloc might commit the previous transaction | |
1160 | * (and release all the locks). An error from here on will result in | |
1161 | * the transaction cancel unlocking dp so don't do it explicitly in the | |
1162 | * error path. | |
1163 | */ | |
1164 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
1165 | unlock_dp_on_error = false; | |
1166 | ||
1167 | error = xfs_dir_createname(tp, dp, name, ip->i_ino, | |
1168 | &first_block, &free_list, resblks ? | |
1169 | resblks - XFS_IALLOC_SPACE_RES(mp) : 0); | |
1170 | if (error) { | |
2451337d | 1171 | ASSERT(error != -ENOSPC); |
c24b5dfa DC |
1172 | goto out_trans_abort; |
1173 | } | |
1174 | xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
1175 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
1176 | ||
1177 | if (is_dir) { | |
1178 | error = xfs_dir_init(tp, ip, dp); | |
1179 | if (error) | |
1180 | goto out_bmap_cancel; | |
1181 | ||
1182 | error = xfs_bumplink(tp, dp); | |
1183 | if (error) | |
1184 | goto out_bmap_cancel; | |
1185 | } | |
1186 | ||
1187 | /* | |
1188 | * If this is a synchronous mount, make sure that the | |
1189 | * create transaction goes to disk before returning to | |
1190 | * the user. | |
1191 | */ | |
1192 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) | |
1193 | xfs_trans_set_sync(tp); | |
1194 | ||
1195 | /* | |
1196 | * Attach the dquot(s) to the inodes and modify them incore. | |
1197 | * These ids of the inode couldn't have changed since the new | |
1198 | * inode has been locked ever since it was created. | |
1199 | */ | |
1200 | xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp); | |
1201 | ||
1202 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
1203 | if (error) | |
1204 | goto out_bmap_cancel; | |
1205 | ||
1206 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); | |
1207 | if (error) | |
1208 | goto out_release_inode; | |
1209 | ||
1210 | xfs_qm_dqrele(udqp); | |
1211 | xfs_qm_dqrele(gdqp); | |
1212 | xfs_qm_dqrele(pdqp); | |
1213 | ||
1214 | *ipp = ip; | |
1215 | return 0; | |
1216 | ||
1217 | out_bmap_cancel: | |
1218 | xfs_bmap_cancel(&free_list); | |
1219 | out_trans_abort: | |
1220 | cancel_flags |= XFS_TRANS_ABORT; | |
1221 | out_trans_cancel: | |
1222 | xfs_trans_cancel(tp, cancel_flags); | |
1223 | out_release_inode: | |
1224 | /* | |
58c90473 DC |
1225 | * Wait until after the current transaction is aborted to finish the |
1226 | * setup of the inode and release the inode. This prevents recursive | |
1227 | * transactions and deadlocks from xfs_inactive. | |
c24b5dfa | 1228 | */ |
58c90473 DC |
1229 | if (ip) { |
1230 | xfs_finish_inode_setup(ip); | |
c24b5dfa | 1231 | IRELE(ip); |
58c90473 | 1232 | } |
c24b5dfa DC |
1233 | |
1234 | xfs_qm_dqrele(udqp); | |
1235 | xfs_qm_dqrele(gdqp); | |
1236 | xfs_qm_dqrele(pdqp); | |
1237 | ||
1238 | if (unlock_dp_on_error) | |
1239 | xfs_iunlock(dp, XFS_ILOCK_EXCL); | |
1240 | return error; | |
1241 | } | |
1242 | ||
99b6436b ZYW |
1243 | int |
1244 | xfs_create_tmpfile( | |
1245 | struct xfs_inode *dp, | |
1246 | struct dentry *dentry, | |
330033d6 BF |
1247 | umode_t mode, |
1248 | struct xfs_inode **ipp) | |
99b6436b ZYW |
1249 | { |
1250 | struct xfs_mount *mp = dp->i_mount; | |
1251 | struct xfs_inode *ip = NULL; | |
1252 | struct xfs_trans *tp = NULL; | |
1253 | int error; | |
1254 | uint cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
1255 | prid_t prid; | |
1256 | struct xfs_dquot *udqp = NULL; | |
1257 | struct xfs_dquot *gdqp = NULL; | |
1258 | struct xfs_dquot *pdqp = NULL; | |
1259 | struct xfs_trans_res *tres; | |
1260 | uint resblks; | |
1261 | ||
1262 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2451337d | 1263 | return -EIO; |
99b6436b ZYW |
1264 | |
1265 | prid = xfs_get_initial_prid(dp); | |
1266 | ||
1267 | /* | |
1268 | * Make sure that we have allocated dquot(s) on disk. | |
1269 | */ | |
1270 | error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()), | |
1271 | xfs_kgid_to_gid(current_fsgid()), prid, | |
1272 | XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, | |
1273 | &udqp, &gdqp, &pdqp); | |
1274 | if (error) | |
1275 | return error; | |
1276 | ||
1277 | resblks = XFS_IALLOC_SPACE_RES(mp); | |
1278 | tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE_TMPFILE); | |
1279 | ||
1280 | tres = &M_RES(mp)->tr_create_tmpfile; | |
1281 | error = xfs_trans_reserve(tp, tres, resblks, 0); | |
2451337d | 1282 | if (error == -ENOSPC) { |
99b6436b ZYW |
1283 | /* No space at all so try a "no-allocation" reservation */ |
1284 | resblks = 0; | |
1285 | error = xfs_trans_reserve(tp, tres, 0, 0); | |
1286 | } | |
1287 | if (error) { | |
1288 | cancel_flags = 0; | |
1289 | goto out_trans_cancel; | |
1290 | } | |
1291 | ||
1292 | error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, | |
1293 | pdqp, resblks, 1, 0); | |
1294 | if (error) | |
1295 | goto out_trans_cancel; | |
1296 | ||
1297 | error = xfs_dir_ialloc(&tp, dp, mode, 1, 0, | |
1298 | prid, resblks > 0, &ip, NULL); | |
1299 | if (error) { | |
2451337d | 1300 | if (error == -ENOSPC) |
99b6436b ZYW |
1301 | goto out_trans_cancel; |
1302 | goto out_trans_abort; | |
1303 | } | |
1304 | ||
1305 | if (mp->m_flags & XFS_MOUNT_WSYNC) | |
1306 | xfs_trans_set_sync(tp); | |
1307 | ||
1308 | /* | |
1309 | * Attach the dquot(s) to the inodes and modify them incore. | |
1310 | * These ids of the inode couldn't have changed since the new | |
1311 | * inode has been locked ever since it was created. | |
1312 | */ | |
1313 | xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp); | |
1314 | ||
1315 | ip->i_d.di_nlink--; | |
99b6436b ZYW |
1316 | error = xfs_iunlink(tp, ip); |
1317 | if (error) | |
1318 | goto out_trans_abort; | |
1319 | ||
1320 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); | |
1321 | if (error) | |
1322 | goto out_release_inode; | |
1323 | ||
1324 | xfs_qm_dqrele(udqp); | |
1325 | xfs_qm_dqrele(gdqp); | |
1326 | xfs_qm_dqrele(pdqp); | |
1327 | ||
330033d6 | 1328 | *ipp = ip; |
99b6436b ZYW |
1329 | return 0; |
1330 | ||
1331 | out_trans_abort: | |
1332 | cancel_flags |= XFS_TRANS_ABORT; | |
1333 | out_trans_cancel: | |
1334 | xfs_trans_cancel(tp, cancel_flags); | |
1335 | out_release_inode: | |
1336 | /* | |
58c90473 DC |
1337 | * Wait until after the current transaction is aborted to finish the |
1338 | * setup of the inode and release the inode. This prevents recursive | |
1339 | * transactions and deadlocks from xfs_inactive. | |
99b6436b | 1340 | */ |
58c90473 DC |
1341 | if (ip) { |
1342 | xfs_finish_inode_setup(ip); | |
99b6436b | 1343 | IRELE(ip); |
58c90473 | 1344 | } |
99b6436b ZYW |
1345 | |
1346 | xfs_qm_dqrele(udqp); | |
1347 | xfs_qm_dqrele(gdqp); | |
1348 | xfs_qm_dqrele(pdqp); | |
1349 | ||
1350 | return error; | |
1351 | } | |
1352 | ||
c24b5dfa DC |
1353 | int |
1354 | xfs_link( | |
1355 | xfs_inode_t *tdp, | |
1356 | xfs_inode_t *sip, | |
1357 | struct xfs_name *target_name) | |
1358 | { | |
1359 | xfs_mount_t *mp = tdp->i_mount; | |
1360 | xfs_trans_t *tp; | |
1361 | int error; | |
1362 | xfs_bmap_free_t free_list; | |
1363 | xfs_fsblock_t first_block; | |
1364 | int cancel_flags; | |
1365 | int committed; | |
1366 | int resblks; | |
1367 | ||
1368 | trace_xfs_link(tdp, target_name); | |
1369 | ||
1370 | ASSERT(!S_ISDIR(sip->i_d.di_mode)); | |
1371 | ||
1372 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2451337d | 1373 | return -EIO; |
c24b5dfa DC |
1374 | |
1375 | error = xfs_qm_dqattach(sip, 0); | |
1376 | if (error) | |
1377 | goto std_return; | |
1378 | ||
1379 | error = xfs_qm_dqattach(tdp, 0); | |
1380 | if (error) | |
1381 | goto std_return; | |
1382 | ||
1383 | tp = xfs_trans_alloc(mp, XFS_TRANS_LINK); | |
1384 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
1385 | resblks = XFS_LINK_SPACE_RES(mp, target_name->len); | |
3d3c8b52 | 1386 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_link, resblks, 0); |
2451337d | 1387 | if (error == -ENOSPC) { |
c24b5dfa | 1388 | resblks = 0; |
3d3c8b52 | 1389 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_link, 0, 0); |
c24b5dfa DC |
1390 | } |
1391 | if (error) { | |
1392 | cancel_flags = 0; | |
1393 | goto error_return; | |
1394 | } | |
1395 | ||
1396 | xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL); | |
1397 | ||
1398 | xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL); | |
1399 | xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL); | |
1400 | ||
1401 | /* | |
1402 | * If we are using project inheritance, we only allow hard link | |
1403 | * creation in our tree when the project IDs are the same; else | |
1404 | * the tree quota mechanism could be circumvented. | |
1405 | */ | |
1406 | if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && | |
1407 | (xfs_get_projid(tdp) != xfs_get_projid(sip)))) { | |
2451337d | 1408 | error = -EXDEV; |
c24b5dfa DC |
1409 | goto error_return; |
1410 | } | |
1411 | ||
94f3cad5 ES |
1412 | if (!resblks) { |
1413 | error = xfs_dir_canenter(tp, tdp, target_name); | |
1414 | if (error) | |
1415 | goto error_return; | |
1416 | } | |
c24b5dfa DC |
1417 | |
1418 | xfs_bmap_init(&free_list, &first_block); | |
1419 | ||
ab297431 ZYW |
1420 | if (sip->i_d.di_nlink == 0) { |
1421 | error = xfs_iunlink_remove(tp, sip); | |
1422 | if (error) | |
1423 | goto abort_return; | |
1424 | } | |
1425 | ||
c24b5dfa DC |
1426 | error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino, |
1427 | &first_block, &free_list, resblks); | |
1428 | if (error) | |
1429 | goto abort_return; | |
1430 | xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
1431 | xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE); | |
1432 | ||
1433 | error = xfs_bumplink(tp, sip); | |
1434 | if (error) | |
1435 | goto abort_return; | |
1436 | ||
1437 | /* | |
1438 | * If this is a synchronous mount, make sure that the | |
1439 | * link transaction goes to disk before returning to | |
1440 | * the user. | |
1441 | */ | |
1442 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
1443 | xfs_trans_set_sync(tp); | |
1444 | } | |
1445 | ||
1446 | error = xfs_bmap_finish (&tp, &free_list, &committed); | |
1447 | if (error) { | |
1448 | xfs_bmap_cancel(&free_list); | |
1449 | goto abort_return; | |
1450 | } | |
1451 | ||
1452 | return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); | |
1453 | ||
1454 | abort_return: | |
1455 | cancel_flags |= XFS_TRANS_ABORT; | |
1456 | error_return: | |
1457 | xfs_trans_cancel(tp, cancel_flags); | |
1458 | std_return: | |
1459 | return error; | |
1460 | } | |
1461 | ||
1da177e4 | 1462 | /* |
8f04c47a CH |
1463 | * Free up the underlying blocks past new_size. The new size must be smaller |
1464 | * than the current size. This routine can be used both for the attribute and | |
1465 | * data fork, and does not modify the inode size, which is left to the caller. | |
1da177e4 | 1466 | * |
f6485057 DC |
1467 | * The transaction passed to this routine must have made a permanent log |
1468 | * reservation of at least XFS_ITRUNCATE_LOG_RES. This routine may commit the | |
1469 | * given transaction and start new ones, so make sure everything involved in | |
1470 | * the transaction is tidy before calling here. Some transaction will be | |
1471 | * returned to the caller to be committed. The incoming transaction must | |
1472 | * already include the inode, and both inode locks must be held exclusively. | |
1473 | * The inode must also be "held" within the transaction. On return the inode | |
1474 | * will be "held" within the returned transaction. This routine does NOT | |
1475 | * require any disk space to be reserved for it within the transaction. | |
1da177e4 | 1476 | * |
f6485057 DC |
1477 | * If we get an error, we must return with the inode locked and linked into the |
1478 | * current transaction. This keeps things simple for the higher level code, | |
1479 | * because it always knows that the inode is locked and held in the transaction | |
1480 | * that returns to it whether errors occur or not. We don't mark the inode | |
1481 | * dirty on error so that transactions can be easily aborted if possible. | |
1da177e4 LT |
1482 | */ |
1483 | int | |
8f04c47a CH |
1484 | xfs_itruncate_extents( |
1485 | struct xfs_trans **tpp, | |
1486 | struct xfs_inode *ip, | |
1487 | int whichfork, | |
1488 | xfs_fsize_t new_size) | |
1da177e4 | 1489 | { |
8f04c47a CH |
1490 | struct xfs_mount *mp = ip->i_mount; |
1491 | struct xfs_trans *tp = *tpp; | |
1492 | struct xfs_trans *ntp; | |
1493 | xfs_bmap_free_t free_list; | |
1494 | xfs_fsblock_t first_block; | |
1495 | xfs_fileoff_t first_unmap_block; | |
1496 | xfs_fileoff_t last_block; | |
1497 | xfs_filblks_t unmap_len; | |
1498 | int committed; | |
1499 | int error = 0; | |
1500 | int done = 0; | |
1da177e4 | 1501 | |
0b56185b CH |
1502 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
1503 | ASSERT(!atomic_read(&VFS_I(ip)->i_count) || | |
1504 | xfs_isilocked(ip, XFS_IOLOCK_EXCL)); | |
ce7ae151 | 1505 | ASSERT(new_size <= XFS_ISIZE(ip)); |
8f04c47a | 1506 | ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); |
1da177e4 | 1507 | ASSERT(ip->i_itemp != NULL); |
898621d5 | 1508 | ASSERT(ip->i_itemp->ili_lock_flags == 0); |
8f04c47a | 1509 | ASSERT(!XFS_NOT_DQATTACHED(mp, ip)); |
1da177e4 | 1510 | |
673e8e59 CH |
1511 | trace_xfs_itruncate_extents_start(ip, new_size); |
1512 | ||
1da177e4 LT |
1513 | /* |
1514 | * Since it is possible for space to become allocated beyond | |
1515 | * the end of the file (in a crash where the space is allocated | |
1516 | * but the inode size is not yet updated), simply remove any | |
1517 | * blocks which show up between the new EOF and the maximum | |
1518 | * possible file size. If the first block to be removed is | |
1519 | * beyond the maximum file size (ie it is the same as last_block), | |
1520 | * then there is nothing to do. | |
1521 | */ | |
8f04c47a | 1522 | first_unmap_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size); |
32972383 | 1523 | last_block = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); |
8f04c47a CH |
1524 | if (first_unmap_block == last_block) |
1525 | return 0; | |
1526 | ||
1527 | ASSERT(first_unmap_block < last_block); | |
1528 | unmap_len = last_block - first_unmap_block + 1; | |
1da177e4 | 1529 | while (!done) { |
9d87c319 | 1530 | xfs_bmap_init(&free_list, &first_block); |
8f04c47a | 1531 | error = xfs_bunmapi(tp, ip, |
3e57ecf6 | 1532 | first_unmap_block, unmap_len, |
8f04c47a | 1533 | xfs_bmapi_aflag(whichfork), |
1da177e4 | 1534 | XFS_ITRUNC_MAX_EXTENTS, |
3e57ecf6 | 1535 | &first_block, &free_list, |
b4e9181e | 1536 | &done); |
8f04c47a CH |
1537 | if (error) |
1538 | goto out_bmap_cancel; | |
1da177e4 LT |
1539 | |
1540 | /* | |
1541 | * Duplicate the transaction that has the permanent | |
1542 | * reservation and commit the old transaction. | |
1543 | */ | |
8f04c47a | 1544 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
898621d5 | 1545 | if (committed) |
ddc3415a | 1546 | xfs_trans_ijoin(tp, ip, 0); |
8f04c47a CH |
1547 | if (error) |
1548 | goto out_bmap_cancel; | |
1da177e4 LT |
1549 | |
1550 | if (committed) { | |
1551 | /* | |
f6485057 | 1552 | * Mark the inode dirty so it will be logged and |
e5720eec | 1553 | * moved forward in the log as part of every commit. |
1da177e4 | 1554 | */ |
8f04c47a | 1555 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
1da177e4 | 1556 | } |
f6485057 | 1557 | |
8f04c47a CH |
1558 | ntp = xfs_trans_dup(tp); |
1559 | error = xfs_trans_commit(tp, 0); | |
1560 | tp = ntp; | |
e5720eec | 1561 | |
ddc3415a | 1562 | xfs_trans_ijoin(tp, ip, 0); |
f6485057 | 1563 | |
cc09c0dc | 1564 | if (error) |
8f04c47a CH |
1565 | goto out; |
1566 | ||
cc09c0dc | 1567 | /* |
8f04c47a | 1568 | * Transaction commit worked ok so we can drop the extra ticket |
cc09c0dc DC |
1569 | * reference that we gained in xfs_trans_dup() |
1570 | */ | |
8f04c47a | 1571 | xfs_log_ticket_put(tp->t_ticket); |
3d3c8b52 | 1572 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0); |
f6485057 | 1573 | if (error) |
8f04c47a | 1574 | goto out; |
1da177e4 | 1575 | } |
8f04c47a | 1576 | |
673e8e59 CH |
1577 | /* |
1578 | * Always re-log the inode so that our permanent transaction can keep | |
1579 | * on rolling it forward in the log. | |
1580 | */ | |
1581 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
1582 | ||
1583 | trace_xfs_itruncate_extents_end(ip, new_size); | |
1584 | ||
8f04c47a CH |
1585 | out: |
1586 | *tpp = tp; | |
1587 | return error; | |
1588 | out_bmap_cancel: | |
1da177e4 | 1589 | /* |
8f04c47a CH |
1590 | * If the bunmapi call encounters an error, return to the caller where |
1591 | * the transaction can be properly aborted. We just need to make sure | |
1592 | * we're not holding any resources that we were not when we came in. | |
1da177e4 | 1593 | */ |
8f04c47a CH |
1594 | xfs_bmap_cancel(&free_list); |
1595 | goto out; | |
1596 | } | |
1597 | ||
c24b5dfa DC |
1598 | int |
1599 | xfs_release( | |
1600 | xfs_inode_t *ip) | |
1601 | { | |
1602 | xfs_mount_t *mp = ip->i_mount; | |
1603 | int error; | |
1604 | ||
1605 | if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0)) | |
1606 | return 0; | |
1607 | ||
1608 | /* If this is a read-only mount, don't do this (would generate I/O) */ | |
1609 | if (mp->m_flags & XFS_MOUNT_RDONLY) | |
1610 | return 0; | |
1611 | ||
1612 | if (!XFS_FORCED_SHUTDOWN(mp)) { | |
1613 | int truncated; | |
1614 | ||
c24b5dfa DC |
1615 | /* |
1616 | * If we previously truncated this file and removed old data | |
1617 | * in the process, we want to initiate "early" writeout on | |
1618 | * the last close. This is an attempt to combat the notorious | |
1619 | * NULL files problem which is particularly noticeable from a | |
1620 | * truncate down, buffered (re-)write (delalloc), followed by | |
1621 | * a crash. What we are effectively doing here is | |
1622 | * significantly reducing the time window where we'd otherwise | |
1623 | * be exposed to that problem. | |
1624 | */ | |
1625 | truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED); | |
1626 | if (truncated) { | |
1627 | xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE); | |
eac152b4 | 1628 | if (ip->i_delayed_blks > 0) { |
2451337d | 1629 | error = filemap_flush(VFS_I(ip)->i_mapping); |
c24b5dfa DC |
1630 | if (error) |
1631 | return error; | |
1632 | } | |
1633 | } | |
1634 | } | |
1635 | ||
1636 | if (ip->i_d.di_nlink == 0) | |
1637 | return 0; | |
1638 | ||
1639 | if (xfs_can_free_eofblocks(ip, false)) { | |
1640 | ||
1641 | /* | |
1642 | * If we can't get the iolock just skip truncating the blocks | |
1643 | * past EOF because we could deadlock with the mmap_sem | |
1644 | * otherwise. We'll get another chance to drop them once the | |
1645 | * last reference to the inode is dropped, so we'll never leak | |
1646 | * blocks permanently. | |
1647 | * | |
1648 | * Further, check if the inode is being opened, written and | |
1649 | * closed frequently and we have delayed allocation blocks | |
1650 | * outstanding (e.g. streaming writes from the NFS server), | |
1651 | * truncating the blocks past EOF will cause fragmentation to | |
1652 | * occur. | |
1653 | * | |
1654 | * In this case don't do the truncation, either, but we have to | |
1655 | * be careful how we detect this case. Blocks beyond EOF show | |
1656 | * up as i_delayed_blks even when the inode is clean, so we | |
1657 | * need to truncate them away first before checking for a dirty | |
1658 | * release. Hence on the first dirty close we will still remove | |
1659 | * the speculative allocation, but after that we will leave it | |
1660 | * in place. | |
1661 | */ | |
1662 | if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE)) | |
1663 | return 0; | |
1664 | ||
1665 | error = xfs_free_eofblocks(mp, ip, true); | |
2451337d | 1666 | if (error && error != -EAGAIN) |
c24b5dfa DC |
1667 | return error; |
1668 | ||
1669 | /* delalloc blocks after truncation means it really is dirty */ | |
1670 | if (ip->i_delayed_blks) | |
1671 | xfs_iflags_set(ip, XFS_IDIRTY_RELEASE); | |
1672 | } | |
1673 | return 0; | |
1674 | } | |
1675 | ||
f7be2d7f BF |
1676 | /* |
1677 | * xfs_inactive_truncate | |
1678 | * | |
1679 | * Called to perform a truncate when an inode becomes unlinked. | |
1680 | */ | |
1681 | STATIC int | |
1682 | xfs_inactive_truncate( | |
1683 | struct xfs_inode *ip) | |
1684 | { | |
1685 | struct xfs_mount *mp = ip->i_mount; | |
1686 | struct xfs_trans *tp; | |
1687 | int error; | |
1688 | ||
1689 | tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); | |
1690 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0); | |
1691 | if (error) { | |
1692 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1693 | xfs_trans_cancel(tp, 0); | |
1694 | return error; | |
1695 | } | |
1696 | ||
1697 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1698 | xfs_trans_ijoin(tp, ip, 0); | |
1699 | ||
1700 | /* | |
1701 | * Log the inode size first to prevent stale data exposure in the event | |
1702 | * of a system crash before the truncate completes. See the related | |
1703 | * comment in xfs_setattr_size() for details. | |
1704 | */ | |
1705 | ip->i_d.di_size = 0; | |
1706 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
1707 | ||
1708 | error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0); | |
1709 | if (error) | |
1710 | goto error_trans_cancel; | |
1711 | ||
1712 | ASSERT(ip->i_d.di_nextents == 0); | |
1713 | ||
1714 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); | |
1715 | if (error) | |
1716 | goto error_unlock; | |
1717 | ||
1718 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1719 | return 0; | |
1720 | ||
1721 | error_trans_cancel: | |
1722 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
1723 | error_unlock: | |
1724 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1725 | return error; | |
1726 | } | |
1727 | ||
88877d2b BF |
1728 | /* |
1729 | * xfs_inactive_ifree() | |
1730 | * | |
1731 | * Perform the inode free when an inode is unlinked. | |
1732 | */ | |
1733 | STATIC int | |
1734 | xfs_inactive_ifree( | |
1735 | struct xfs_inode *ip) | |
1736 | { | |
1737 | xfs_bmap_free_t free_list; | |
1738 | xfs_fsblock_t first_block; | |
1739 | int committed; | |
1740 | struct xfs_mount *mp = ip->i_mount; | |
1741 | struct xfs_trans *tp; | |
1742 | int error; | |
1743 | ||
1744 | tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); | |
9d43b180 BF |
1745 | |
1746 | /* | |
1747 | * The ifree transaction might need to allocate blocks for record | |
1748 | * insertion to the finobt. We don't want to fail here at ENOSPC, so | |
1749 | * allow ifree to dip into the reserved block pool if necessary. | |
1750 | * | |
1751 | * Freeing large sets of inodes generally means freeing inode chunks, | |
1752 | * directory and file data blocks, so this should be relatively safe. | |
1753 | * Only under severe circumstances should it be possible to free enough | |
1754 | * inodes to exhaust the reserve block pool via finobt expansion while | |
1755 | * at the same time not creating free space in the filesystem. | |
1756 | * | |
1757 | * Send a warning if the reservation does happen to fail, as the inode | |
1758 | * now remains allocated and sits on the unlinked list until the fs is | |
1759 | * repaired. | |
1760 | */ | |
1761 | tp->t_flags |= XFS_TRANS_RESERVE; | |
1762 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ifree, | |
1763 | XFS_IFREE_SPACE_RES(mp), 0); | |
88877d2b | 1764 | if (error) { |
2451337d | 1765 | if (error == -ENOSPC) { |
9d43b180 BF |
1766 | xfs_warn_ratelimited(mp, |
1767 | "Failed to remove inode(s) from unlinked list. " | |
1768 | "Please free space, unmount and run xfs_repair."); | |
1769 | } else { | |
1770 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1771 | } | |
88877d2b BF |
1772 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES); |
1773 | return error; | |
1774 | } | |
1775 | ||
1776 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1777 | xfs_trans_ijoin(tp, ip, 0); | |
1778 | ||
1779 | xfs_bmap_init(&free_list, &first_block); | |
1780 | error = xfs_ifree(tp, ip, &free_list); | |
1781 | if (error) { | |
1782 | /* | |
1783 | * If we fail to free the inode, shut down. The cancel | |
1784 | * might do that, we need to make sure. Otherwise the | |
1785 | * inode might be lost for a long time or forever. | |
1786 | */ | |
1787 | if (!XFS_FORCED_SHUTDOWN(mp)) { | |
1788 | xfs_notice(mp, "%s: xfs_ifree returned error %d", | |
1789 | __func__, error); | |
1790 | xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR); | |
1791 | } | |
1792 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT); | |
1793 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1794 | return error; | |
1795 | } | |
1796 | ||
1797 | /* | |
1798 | * Credit the quota account(s). The inode is gone. | |
1799 | */ | |
1800 | xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1); | |
1801 | ||
1802 | /* | |
1803 | * Just ignore errors at this point. There is nothing we can | |
1804 | * do except to try to keep going. Make sure it's not a silent | |
1805 | * error. | |
1806 | */ | |
1807 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
1808 | if (error) | |
1809 | xfs_notice(mp, "%s: xfs_bmap_finish returned error %d", | |
1810 | __func__, error); | |
1811 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); | |
1812 | if (error) | |
1813 | xfs_notice(mp, "%s: xfs_trans_commit returned error %d", | |
1814 | __func__, error); | |
1815 | ||
1816 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1817 | return 0; | |
1818 | } | |
1819 | ||
c24b5dfa DC |
1820 | /* |
1821 | * xfs_inactive | |
1822 | * | |
1823 | * This is called when the vnode reference count for the vnode | |
1824 | * goes to zero. If the file has been unlinked, then it must | |
1825 | * now be truncated. Also, we clear all of the read-ahead state | |
1826 | * kept for the inode here since the file is now closed. | |
1827 | */ | |
74564fb4 | 1828 | void |
c24b5dfa DC |
1829 | xfs_inactive( |
1830 | xfs_inode_t *ip) | |
1831 | { | |
3d3c8b52 | 1832 | struct xfs_mount *mp; |
3d3c8b52 JL |
1833 | int error; |
1834 | int truncate = 0; | |
c24b5dfa DC |
1835 | |
1836 | /* | |
1837 | * If the inode is already free, then there can be nothing | |
1838 | * to clean up here. | |
1839 | */ | |
d948709b | 1840 | if (ip->i_d.di_mode == 0) { |
c24b5dfa DC |
1841 | ASSERT(ip->i_df.if_real_bytes == 0); |
1842 | ASSERT(ip->i_df.if_broot_bytes == 0); | |
74564fb4 | 1843 | return; |
c24b5dfa DC |
1844 | } |
1845 | ||
1846 | mp = ip->i_mount; | |
1847 | ||
c24b5dfa DC |
1848 | /* If this is a read-only mount, don't do this (would generate I/O) */ |
1849 | if (mp->m_flags & XFS_MOUNT_RDONLY) | |
74564fb4 | 1850 | return; |
c24b5dfa DC |
1851 | |
1852 | if (ip->i_d.di_nlink != 0) { | |
1853 | /* | |
1854 | * force is true because we are evicting an inode from the | |
1855 | * cache. Post-eof blocks must be freed, lest we end up with | |
1856 | * broken free space accounting. | |
1857 | */ | |
74564fb4 BF |
1858 | if (xfs_can_free_eofblocks(ip, true)) |
1859 | xfs_free_eofblocks(mp, ip, false); | |
1860 | ||
1861 | return; | |
c24b5dfa DC |
1862 | } |
1863 | ||
1864 | if (S_ISREG(ip->i_d.di_mode) && | |
1865 | (ip->i_d.di_size != 0 || XFS_ISIZE(ip) != 0 || | |
1866 | ip->i_d.di_nextents > 0 || ip->i_delayed_blks > 0)) | |
1867 | truncate = 1; | |
1868 | ||
1869 | error = xfs_qm_dqattach(ip, 0); | |
1870 | if (error) | |
74564fb4 | 1871 | return; |
c24b5dfa | 1872 | |
f7be2d7f | 1873 | if (S_ISLNK(ip->i_d.di_mode)) |
36b21dde | 1874 | error = xfs_inactive_symlink(ip); |
f7be2d7f BF |
1875 | else if (truncate) |
1876 | error = xfs_inactive_truncate(ip); | |
1877 | if (error) | |
74564fb4 | 1878 | return; |
c24b5dfa DC |
1879 | |
1880 | /* | |
1881 | * If there are attributes associated with the file then blow them away | |
1882 | * now. The code calls a routine that recursively deconstructs the | |
1883 | * attribute fork. We need to just commit the current transaction | |
1884 | * because we can't use it for xfs_attr_inactive(). | |
1885 | */ | |
1886 | if (ip->i_d.di_anextents > 0) { | |
1887 | ASSERT(ip->i_d.di_forkoff != 0); | |
1888 | ||
c24b5dfa DC |
1889 | error = xfs_attr_inactive(ip); |
1890 | if (error) | |
74564fb4 | 1891 | return; |
c24b5dfa DC |
1892 | } |
1893 | ||
1894 | if (ip->i_afp) | |
1895 | xfs_idestroy_fork(ip, XFS_ATTR_FORK); | |
1896 | ||
1897 | ASSERT(ip->i_d.di_anextents == 0); | |
1898 | ||
1899 | /* | |
1900 | * Free the inode. | |
1901 | */ | |
88877d2b BF |
1902 | error = xfs_inactive_ifree(ip); |
1903 | if (error) | |
74564fb4 | 1904 | return; |
c24b5dfa DC |
1905 | |
1906 | /* | |
1907 | * Release the dquots held by inode, if any. | |
1908 | */ | |
1909 | xfs_qm_dqdetach(ip); | |
c24b5dfa DC |
1910 | } |
1911 | ||
1da177e4 LT |
1912 | /* |
1913 | * This is called when the inode's link count goes to 0. | |
1914 | * We place the on-disk inode on a list in the AGI. It | |
1915 | * will be pulled from this list when the inode is freed. | |
1916 | */ | |
1917 | int | |
1918 | xfs_iunlink( | |
1919 | xfs_trans_t *tp, | |
1920 | xfs_inode_t *ip) | |
1921 | { | |
1922 | xfs_mount_t *mp; | |
1923 | xfs_agi_t *agi; | |
1924 | xfs_dinode_t *dip; | |
1925 | xfs_buf_t *agibp; | |
1926 | xfs_buf_t *ibp; | |
1da177e4 LT |
1927 | xfs_agino_t agino; |
1928 | short bucket_index; | |
1929 | int offset; | |
1930 | int error; | |
1da177e4 LT |
1931 | |
1932 | ASSERT(ip->i_d.di_nlink == 0); | |
1933 | ASSERT(ip->i_d.di_mode != 0); | |
1da177e4 LT |
1934 | |
1935 | mp = tp->t_mountp; | |
1936 | ||
1da177e4 LT |
1937 | /* |
1938 | * Get the agi buffer first. It ensures lock ordering | |
1939 | * on the list. | |
1940 | */ | |
5e1be0fb | 1941 | error = xfs_read_agi(mp, tp, XFS_INO_TO_AGNO(mp, ip->i_ino), &agibp); |
859d7182 | 1942 | if (error) |
1da177e4 | 1943 | return error; |
1da177e4 | 1944 | agi = XFS_BUF_TO_AGI(agibp); |
5e1be0fb | 1945 | |
1da177e4 LT |
1946 | /* |
1947 | * Get the index into the agi hash table for the | |
1948 | * list this inode will go on. | |
1949 | */ | |
1950 | agino = XFS_INO_TO_AGINO(mp, ip->i_ino); | |
1951 | ASSERT(agino != 0); | |
1952 | bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS; | |
1953 | ASSERT(agi->agi_unlinked[bucket_index]); | |
16259e7d | 1954 | ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != agino); |
1da177e4 | 1955 | |
69ef921b | 1956 | if (agi->agi_unlinked[bucket_index] != cpu_to_be32(NULLAGINO)) { |
1da177e4 LT |
1957 | /* |
1958 | * There is already another inode in the bucket we need | |
1959 | * to add ourselves to. Add us at the front of the list. | |
1960 | * Here we put the head pointer into our next pointer, | |
1961 | * and then we fall through to point the head at us. | |
1962 | */ | |
475ee413 CH |
1963 | error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp, |
1964 | 0, 0); | |
c319b58b VA |
1965 | if (error) |
1966 | return error; | |
1967 | ||
69ef921b | 1968 | ASSERT(dip->di_next_unlinked == cpu_to_be32(NULLAGINO)); |
1da177e4 | 1969 | dip->di_next_unlinked = agi->agi_unlinked[bucket_index]; |
92bfc6e7 | 1970 | offset = ip->i_imap.im_boffset + |
1da177e4 | 1971 | offsetof(xfs_dinode_t, di_next_unlinked); |
0a32c26e DC |
1972 | |
1973 | /* need to recalc the inode CRC if appropriate */ | |
1974 | xfs_dinode_calc_crc(mp, dip); | |
1975 | ||
1da177e4 LT |
1976 | xfs_trans_inode_buf(tp, ibp); |
1977 | xfs_trans_log_buf(tp, ibp, offset, | |
1978 | (offset + sizeof(xfs_agino_t) - 1)); | |
1979 | xfs_inobp_check(mp, ibp); | |
1980 | } | |
1981 | ||
1982 | /* | |
1983 | * Point the bucket head pointer at the inode being inserted. | |
1984 | */ | |
1985 | ASSERT(agino != 0); | |
16259e7d | 1986 | agi->agi_unlinked[bucket_index] = cpu_to_be32(agino); |
1da177e4 LT |
1987 | offset = offsetof(xfs_agi_t, agi_unlinked) + |
1988 | (sizeof(xfs_agino_t) * bucket_index); | |
f19b872b | 1989 | xfs_trans_buf_set_type(tp, agibp, XFS_BLFT_AGI_BUF); |
1da177e4 LT |
1990 | xfs_trans_log_buf(tp, agibp, offset, |
1991 | (offset + sizeof(xfs_agino_t) - 1)); | |
1992 | return 0; | |
1993 | } | |
1994 | ||
1995 | /* | |
1996 | * Pull the on-disk inode from the AGI unlinked list. | |
1997 | */ | |
1998 | STATIC int | |
1999 | xfs_iunlink_remove( | |
2000 | xfs_trans_t *tp, | |
2001 | xfs_inode_t *ip) | |
2002 | { | |
2003 | xfs_ino_t next_ino; | |
2004 | xfs_mount_t *mp; | |
2005 | xfs_agi_t *agi; | |
2006 | xfs_dinode_t *dip; | |
2007 | xfs_buf_t *agibp; | |
2008 | xfs_buf_t *ibp; | |
2009 | xfs_agnumber_t agno; | |
1da177e4 LT |
2010 | xfs_agino_t agino; |
2011 | xfs_agino_t next_agino; | |
2012 | xfs_buf_t *last_ibp; | |
6fdf8ccc | 2013 | xfs_dinode_t *last_dip = NULL; |
1da177e4 | 2014 | short bucket_index; |
6fdf8ccc | 2015 | int offset, last_offset = 0; |
1da177e4 | 2016 | int error; |
1da177e4 | 2017 | |
1da177e4 | 2018 | mp = tp->t_mountp; |
1da177e4 | 2019 | agno = XFS_INO_TO_AGNO(mp, ip->i_ino); |
1da177e4 LT |
2020 | |
2021 | /* | |
2022 | * Get the agi buffer first. It ensures lock ordering | |
2023 | * on the list. | |
2024 | */ | |
5e1be0fb CH |
2025 | error = xfs_read_agi(mp, tp, agno, &agibp); |
2026 | if (error) | |
1da177e4 | 2027 | return error; |
5e1be0fb | 2028 | |
1da177e4 | 2029 | agi = XFS_BUF_TO_AGI(agibp); |
5e1be0fb | 2030 | |
1da177e4 LT |
2031 | /* |
2032 | * Get the index into the agi hash table for the | |
2033 | * list this inode will go on. | |
2034 | */ | |
2035 | agino = XFS_INO_TO_AGINO(mp, ip->i_ino); | |
2036 | ASSERT(agino != 0); | |
2037 | bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS; | |
69ef921b | 2038 | ASSERT(agi->agi_unlinked[bucket_index] != cpu_to_be32(NULLAGINO)); |
1da177e4 LT |
2039 | ASSERT(agi->agi_unlinked[bucket_index]); |
2040 | ||
16259e7d | 2041 | if (be32_to_cpu(agi->agi_unlinked[bucket_index]) == agino) { |
1da177e4 | 2042 | /* |
475ee413 CH |
2043 | * We're at the head of the list. Get the inode's on-disk |
2044 | * buffer to see if there is anyone after us on the list. | |
2045 | * Only modify our next pointer if it is not already NULLAGINO. | |
2046 | * This saves us the overhead of dealing with the buffer when | |
2047 | * there is no need to change it. | |
1da177e4 | 2048 | */ |
475ee413 CH |
2049 | error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp, |
2050 | 0, 0); | |
1da177e4 | 2051 | if (error) { |
475ee413 | 2052 | xfs_warn(mp, "%s: xfs_imap_to_bp returned error %d.", |
0b932ccc | 2053 | __func__, error); |
1da177e4 LT |
2054 | return error; |
2055 | } | |
347d1c01 | 2056 | next_agino = be32_to_cpu(dip->di_next_unlinked); |
1da177e4 LT |
2057 | ASSERT(next_agino != 0); |
2058 | if (next_agino != NULLAGINO) { | |
347d1c01 | 2059 | dip->di_next_unlinked = cpu_to_be32(NULLAGINO); |
92bfc6e7 | 2060 | offset = ip->i_imap.im_boffset + |
1da177e4 | 2061 | offsetof(xfs_dinode_t, di_next_unlinked); |
0a32c26e DC |
2062 | |
2063 | /* need to recalc the inode CRC if appropriate */ | |
2064 | xfs_dinode_calc_crc(mp, dip); | |
2065 | ||
1da177e4 LT |
2066 | xfs_trans_inode_buf(tp, ibp); |
2067 | xfs_trans_log_buf(tp, ibp, offset, | |
2068 | (offset + sizeof(xfs_agino_t) - 1)); | |
2069 | xfs_inobp_check(mp, ibp); | |
2070 | } else { | |
2071 | xfs_trans_brelse(tp, ibp); | |
2072 | } | |
2073 | /* | |
2074 | * Point the bucket head pointer at the next inode. | |
2075 | */ | |
2076 | ASSERT(next_agino != 0); | |
2077 | ASSERT(next_agino != agino); | |
16259e7d | 2078 | agi->agi_unlinked[bucket_index] = cpu_to_be32(next_agino); |
1da177e4 LT |
2079 | offset = offsetof(xfs_agi_t, agi_unlinked) + |
2080 | (sizeof(xfs_agino_t) * bucket_index); | |
f19b872b | 2081 | xfs_trans_buf_set_type(tp, agibp, XFS_BLFT_AGI_BUF); |
1da177e4 LT |
2082 | xfs_trans_log_buf(tp, agibp, offset, |
2083 | (offset + sizeof(xfs_agino_t) - 1)); | |
2084 | } else { | |
2085 | /* | |
2086 | * We need to search the list for the inode being freed. | |
2087 | */ | |
16259e7d | 2088 | next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]); |
1da177e4 LT |
2089 | last_ibp = NULL; |
2090 | while (next_agino != agino) { | |
129dbc9a CH |
2091 | struct xfs_imap imap; |
2092 | ||
2093 | if (last_ibp) | |
1da177e4 | 2094 | xfs_trans_brelse(tp, last_ibp); |
129dbc9a CH |
2095 | |
2096 | imap.im_blkno = 0; | |
1da177e4 | 2097 | next_ino = XFS_AGINO_TO_INO(mp, agno, next_agino); |
129dbc9a CH |
2098 | |
2099 | error = xfs_imap(mp, tp, next_ino, &imap, 0); | |
2100 | if (error) { | |
2101 | xfs_warn(mp, | |
2102 | "%s: xfs_imap returned error %d.", | |
2103 | __func__, error); | |
2104 | return error; | |
2105 | } | |
2106 | ||
2107 | error = xfs_imap_to_bp(mp, tp, &imap, &last_dip, | |
2108 | &last_ibp, 0, 0); | |
1da177e4 | 2109 | if (error) { |
0b932ccc | 2110 | xfs_warn(mp, |
129dbc9a | 2111 | "%s: xfs_imap_to_bp returned error %d.", |
0b932ccc | 2112 | __func__, error); |
1da177e4 LT |
2113 | return error; |
2114 | } | |
129dbc9a CH |
2115 | |
2116 | last_offset = imap.im_boffset; | |
347d1c01 | 2117 | next_agino = be32_to_cpu(last_dip->di_next_unlinked); |
1da177e4 LT |
2118 | ASSERT(next_agino != NULLAGINO); |
2119 | ASSERT(next_agino != 0); | |
2120 | } | |
475ee413 | 2121 | |
1da177e4 | 2122 | /* |
475ee413 CH |
2123 | * Now last_ibp points to the buffer previous to us on the |
2124 | * unlinked list. Pull us from the list. | |
1da177e4 | 2125 | */ |
475ee413 CH |
2126 | error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp, |
2127 | 0, 0); | |
1da177e4 | 2128 | if (error) { |
475ee413 | 2129 | xfs_warn(mp, "%s: xfs_imap_to_bp(2) returned error %d.", |
0b932ccc | 2130 | __func__, error); |
1da177e4 LT |
2131 | return error; |
2132 | } | |
347d1c01 | 2133 | next_agino = be32_to_cpu(dip->di_next_unlinked); |
1da177e4 LT |
2134 | ASSERT(next_agino != 0); |
2135 | ASSERT(next_agino != agino); | |
2136 | if (next_agino != NULLAGINO) { | |
347d1c01 | 2137 | dip->di_next_unlinked = cpu_to_be32(NULLAGINO); |
92bfc6e7 | 2138 | offset = ip->i_imap.im_boffset + |
1da177e4 | 2139 | offsetof(xfs_dinode_t, di_next_unlinked); |
0a32c26e DC |
2140 | |
2141 | /* need to recalc the inode CRC if appropriate */ | |
2142 | xfs_dinode_calc_crc(mp, dip); | |
2143 | ||
1da177e4 LT |
2144 | xfs_trans_inode_buf(tp, ibp); |
2145 | xfs_trans_log_buf(tp, ibp, offset, | |
2146 | (offset + sizeof(xfs_agino_t) - 1)); | |
2147 | xfs_inobp_check(mp, ibp); | |
2148 | } else { | |
2149 | xfs_trans_brelse(tp, ibp); | |
2150 | } | |
2151 | /* | |
2152 | * Point the previous inode on the list to the next inode. | |
2153 | */ | |
347d1c01 | 2154 | last_dip->di_next_unlinked = cpu_to_be32(next_agino); |
1da177e4 LT |
2155 | ASSERT(next_agino != 0); |
2156 | offset = last_offset + offsetof(xfs_dinode_t, di_next_unlinked); | |
0a32c26e DC |
2157 | |
2158 | /* need to recalc the inode CRC if appropriate */ | |
2159 | xfs_dinode_calc_crc(mp, last_dip); | |
2160 | ||
1da177e4 LT |
2161 | xfs_trans_inode_buf(tp, last_ibp); |
2162 | xfs_trans_log_buf(tp, last_ibp, offset, | |
2163 | (offset + sizeof(xfs_agino_t) - 1)); | |
2164 | xfs_inobp_check(mp, last_ibp); | |
2165 | } | |
2166 | return 0; | |
2167 | } | |
2168 | ||
5b3eed75 | 2169 | /* |
0b8182db | 2170 | * A big issue when freeing the inode cluster is that we _cannot_ skip any |
5b3eed75 DC |
2171 | * inodes that are in memory - they all must be marked stale and attached to |
2172 | * the cluster buffer. | |
2173 | */ | |
2a30f36d | 2174 | STATIC int |
1da177e4 LT |
2175 | xfs_ifree_cluster( |
2176 | xfs_inode_t *free_ip, | |
2177 | xfs_trans_t *tp, | |
2178 | xfs_ino_t inum) | |
2179 | { | |
2180 | xfs_mount_t *mp = free_ip->i_mount; | |
2181 | int blks_per_cluster; | |
982e939e | 2182 | int inodes_per_cluster; |
1da177e4 | 2183 | int nbufs; |
5b257b4a | 2184 | int i, j; |
1da177e4 LT |
2185 | xfs_daddr_t blkno; |
2186 | xfs_buf_t *bp; | |
5b257b4a | 2187 | xfs_inode_t *ip; |
1da177e4 LT |
2188 | xfs_inode_log_item_t *iip; |
2189 | xfs_log_item_t *lip; | |
5017e97d | 2190 | struct xfs_perag *pag; |
1da177e4 | 2191 | |
5017e97d | 2192 | pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, inum)); |
982e939e JL |
2193 | blks_per_cluster = xfs_icluster_size_fsb(mp); |
2194 | inodes_per_cluster = blks_per_cluster << mp->m_sb.sb_inopblog; | |
2195 | nbufs = mp->m_ialloc_blks / blks_per_cluster; | |
1da177e4 | 2196 | |
982e939e | 2197 | for (j = 0; j < nbufs; j++, inum += inodes_per_cluster) { |
1da177e4 LT |
2198 | blkno = XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, inum), |
2199 | XFS_INO_TO_AGBNO(mp, inum)); | |
2200 | ||
5b257b4a DC |
2201 | /* |
2202 | * We obtain and lock the backing buffer first in the process | |
2203 | * here, as we have to ensure that any dirty inode that we | |
2204 | * can't get the flush lock on is attached to the buffer. | |
2205 | * If we scan the in-memory inodes first, then buffer IO can | |
2206 | * complete before we get a lock on it, and hence we may fail | |
2207 | * to mark all the active inodes on the buffer stale. | |
2208 | */ | |
2209 | bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno, | |
b6aff29f DC |
2210 | mp->m_bsize * blks_per_cluster, |
2211 | XBF_UNMAPPED); | |
5b257b4a | 2212 | |
2a30f36d | 2213 | if (!bp) |
2451337d | 2214 | return -ENOMEM; |
b0f539de DC |
2215 | |
2216 | /* | |
2217 | * This buffer may not have been correctly initialised as we | |
2218 | * didn't read it from disk. That's not important because we are | |
2219 | * only using to mark the buffer as stale in the log, and to | |
2220 | * attach stale cached inodes on it. That means it will never be | |
2221 | * dispatched for IO. If it is, we want to know about it, and we | |
2222 | * want it to fail. We can acheive this by adding a write | |
2223 | * verifier to the buffer. | |
2224 | */ | |
1813dd64 | 2225 | bp->b_ops = &xfs_inode_buf_ops; |
b0f539de | 2226 | |
5b257b4a DC |
2227 | /* |
2228 | * Walk the inodes already attached to the buffer and mark them | |
2229 | * stale. These will all have the flush locks held, so an | |
5b3eed75 DC |
2230 | * in-memory inode walk can't lock them. By marking them all |
2231 | * stale first, we will not attempt to lock them in the loop | |
2232 | * below as the XFS_ISTALE flag will be set. | |
5b257b4a | 2233 | */ |
adadbeef | 2234 | lip = bp->b_fspriv; |
5b257b4a DC |
2235 | while (lip) { |
2236 | if (lip->li_type == XFS_LI_INODE) { | |
2237 | iip = (xfs_inode_log_item_t *)lip; | |
2238 | ASSERT(iip->ili_logged == 1); | |
ca30b2a7 | 2239 | lip->li_cb = xfs_istale_done; |
5b257b4a DC |
2240 | xfs_trans_ail_copy_lsn(mp->m_ail, |
2241 | &iip->ili_flush_lsn, | |
2242 | &iip->ili_item.li_lsn); | |
2243 | xfs_iflags_set(iip->ili_inode, XFS_ISTALE); | |
5b257b4a DC |
2244 | } |
2245 | lip = lip->li_bio_list; | |
2246 | } | |
1da177e4 | 2247 | |
5b3eed75 | 2248 | |
1da177e4 | 2249 | /* |
5b257b4a DC |
2250 | * For each inode in memory attempt to add it to the inode |
2251 | * buffer and set it up for being staled on buffer IO | |
2252 | * completion. This is safe as we've locked out tail pushing | |
2253 | * and flushing by locking the buffer. | |
1da177e4 | 2254 | * |
5b257b4a DC |
2255 | * We have already marked every inode that was part of a |
2256 | * transaction stale above, which means there is no point in | |
2257 | * even trying to lock them. | |
1da177e4 | 2258 | */ |
982e939e | 2259 | for (i = 0; i < inodes_per_cluster; i++) { |
5b3eed75 | 2260 | retry: |
1a3e8f3d | 2261 | rcu_read_lock(); |
da353b0d DC |
2262 | ip = radix_tree_lookup(&pag->pag_ici_root, |
2263 | XFS_INO_TO_AGINO(mp, (inum + i))); | |
1da177e4 | 2264 | |
1a3e8f3d DC |
2265 | /* Inode not in memory, nothing to do */ |
2266 | if (!ip) { | |
2267 | rcu_read_unlock(); | |
1da177e4 LT |
2268 | continue; |
2269 | } | |
2270 | ||
1a3e8f3d DC |
2271 | /* |
2272 | * because this is an RCU protected lookup, we could | |
2273 | * find a recently freed or even reallocated inode | |
2274 | * during the lookup. We need to check under the | |
2275 | * i_flags_lock for a valid inode here. Skip it if it | |
2276 | * is not valid, the wrong inode or stale. | |
2277 | */ | |
2278 | spin_lock(&ip->i_flags_lock); | |
2279 | if (ip->i_ino != inum + i || | |
2280 | __xfs_iflags_test(ip, XFS_ISTALE)) { | |
2281 | spin_unlock(&ip->i_flags_lock); | |
2282 | rcu_read_unlock(); | |
2283 | continue; | |
2284 | } | |
2285 | spin_unlock(&ip->i_flags_lock); | |
2286 | ||
5b3eed75 DC |
2287 | /* |
2288 | * Don't try to lock/unlock the current inode, but we | |
2289 | * _cannot_ skip the other inodes that we did not find | |
2290 | * in the list attached to the buffer and are not | |
2291 | * already marked stale. If we can't lock it, back off | |
2292 | * and retry. | |
2293 | */ | |
5b257b4a DC |
2294 | if (ip != free_ip && |
2295 | !xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) { | |
1a3e8f3d | 2296 | rcu_read_unlock(); |
5b3eed75 DC |
2297 | delay(1); |
2298 | goto retry; | |
1da177e4 | 2299 | } |
1a3e8f3d | 2300 | rcu_read_unlock(); |
1da177e4 | 2301 | |
5b3eed75 | 2302 | xfs_iflock(ip); |
5b257b4a | 2303 | xfs_iflags_set(ip, XFS_ISTALE); |
1da177e4 | 2304 | |
5b3eed75 DC |
2305 | /* |
2306 | * we don't need to attach clean inodes or those only | |
2307 | * with unlogged changes (which we throw away, anyway). | |
2308 | */ | |
1da177e4 | 2309 | iip = ip->i_itemp; |
5b3eed75 | 2310 | if (!iip || xfs_inode_clean(ip)) { |
5b257b4a | 2311 | ASSERT(ip != free_ip); |
1da177e4 LT |
2312 | xfs_ifunlock(ip); |
2313 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
2314 | continue; | |
2315 | } | |
2316 | ||
f5d8d5c4 CH |
2317 | iip->ili_last_fields = iip->ili_fields; |
2318 | iip->ili_fields = 0; | |
1da177e4 | 2319 | iip->ili_logged = 1; |
7b2e2a31 DC |
2320 | xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn, |
2321 | &iip->ili_item.li_lsn); | |
1da177e4 | 2322 | |
ca30b2a7 CH |
2323 | xfs_buf_attach_iodone(bp, xfs_istale_done, |
2324 | &iip->ili_item); | |
5b257b4a DC |
2325 | |
2326 | if (ip != free_ip) | |
1da177e4 | 2327 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
1da177e4 LT |
2328 | } |
2329 | ||
5b3eed75 | 2330 | xfs_trans_stale_inode_buf(tp, bp); |
1da177e4 LT |
2331 | xfs_trans_binval(tp, bp); |
2332 | } | |
2333 | ||
5017e97d | 2334 | xfs_perag_put(pag); |
2a30f36d | 2335 | return 0; |
1da177e4 LT |
2336 | } |
2337 | ||
2338 | /* | |
2339 | * This is called to return an inode to the inode free list. | |
2340 | * The inode should already be truncated to 0 length and have | |
2341 | * no pages associated with it. This routine also assumes that | |
2342 | * the inode is already a part of the transaction. | |
2343 | * | |
2344 | * The on-disk copy of the inode will have been added to the list | |
2345 | * of unlinked inodes in the AGI. We need to remove the inode from | |
2346 | * that list atomically with respect to freeing it here. | |
2347 | */ | |
2348 | int | |
2349 | xfs_ifree( | |
2350 | xfs_trans_t *tp, | |
2351 | xfs_inode_t *ip, | |
2352 | xfs_bmap_free_t *flist) | |
2353 | { | |
2354 | int error; | |
2355 | int delete; | |
2356 | xfs_ino_t first_ino; | |
2357 | ||
579aa9ca | 2358 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
1da177e4 LT |
2359 | ASSERT(ip->i_d.di_nlink == 0); |
2360 | ASSERT(ip->i_d.di_nextents == 0); | |
2361 | ASSERT(ip->i_d.di_anextents == 0); | |
ce7ae151 | 2362 | ASSERT(ip->i_d.di_size == 0 || !S_ISREG(ip->i_d.di_mode)); |
1da177e4 LT |
2363 | ASSERT(ip->i_d.di_nblocks == 0); |
2364 | ||
2365 | /* | |
2366 | * Pull the on-disk inode from the AGI unlinked list. | |
2367 | */ | |
2368 | error = xfs_iunlink_remove(tp, ip); | |
1baaed8f | 2369 | if (error) |
1da177e4 | 2370 | return error; |
1da177e4 LT |
2371 | |
2372 | error = xfs_difree(tp, ip->i_ino, flist, &delete, &first_ino); | |
1baaed8f | 2373 | if (error) |
1da177e4 | 2374 | return error; |
1baaed8f | 2375 | |
1da177e4 LT |
2376 | ip->i_d.di_mode = 0; /* mark incore inode as free */ |
2377 | ip->i_d.di_flags = 0; | |
2378 | ip->i_d.di_dmevmask = 0; | |
2379 | ip->i_d.di_forkoff = 0; /* mark the attr fork not in use */ | |
1da177e4 LT |
2380 | ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS; |
2381 | ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS; | |
2382 | /* | |
2383 | * Bump the generation count so no one will be confused | |
2384 | * by reincarnations of this inode. | |
2385 | */ | |
2386 | ip->i_d.di_gen++; | |
2387 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
2388 | ||
1baaed8f | 2389 | if (delete) |
2a30f36d | 2390 | error = xfs_ifree_cluster(ip, tp, first_ino); |
1da177e4 | 2391 | |
2a30f36d | 2392 | return error; |
1da177e4 LT |
2393 | } |
2394 | ||
1da177e4 | 2395 | /* |
60ec6783 CH |
2396 | * This is called to unpin an inode. The caller must have the inode locked |
2397 | * in at least shared mode so that the buffer cannot be subsequently pinned | |
2398 | * once someone is waiting for it to be unpinned. | |
1da177e4 | 2399 | */ |
60ec6783 | 2400 | static void |
f392e631 | 2401 | xfs_iunpin( |
60ec6783 | 2402 | struct xfs_inode *ip) |
1da177e4 | 2403 | { |
579aa9ca | 2404 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)); |
1da177e4 | 2405 | |
4aaf15d1 DC |
2406 | trace_xfs_inode_unpin_nowait(ip, _RET_IP_); |
2407 | ||
a3f74ffb | 2408 | /* Give the log a push to start the unpinning I/O */ |
60ec6783 | 2409 | xfs_log_force_lsn(ip->i_mount, ip->i_itemp->ili_last_lsn, 0); |
a14a348b | 2410 | |
a3f74ffb | 2411 | } |
1da177e4 | 2412 | |
f392e631 CH |
2413 | static void |
2414 | __xfs_iunpin_wait( | |
2415 | struct xfs_inode *ip) | |
2416 | { | |
2417 | wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IPINNED_BIT); | |
2418 | DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IPINNED_BIT); | |
2419 | ||
2420 | xfs_iunpin(ip); | |
2421 | ||
2422 | do { | |
2423 | prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); | |
2424 | if (xfs_ipincount(ip)) | |
2425 | io_schedule(); | |
2426 | } while (xfs_ipincount(ip)); | |
2427 | finish_wait(wq, &wait.wait); | |
2428 | } | |
2429 | ||
777df5af | 2430 | void |
a3f74ffb | 2431 | xfs_iunpin_wait( |
60ec6783 | 2432 | struct xfs_inode *ip) |
a3f74ffb | 2433 | { |
f392e631 CH |
2434 | if (xfs_ipincount(ip)) |
2435 | __xfs_iunpin_wait(ip); | |
1da177e4 LT |
2436 | } |
2437 | ||
27320369 DC |
2438 | /* |
2439 | * Removing an inode from the namespace involves removing the directory entry | |
2440 | * and dropping the link count on the inode. Removing the directory entry can | |
2441 | * result in locking an AGF (directory blocks were freed) and removing a link | |
2442 | * count can result in placing the inode on an unlinked list which results in | |
2443 | * locking an AGI. | |
2444 | * | |
2445 | * The big problem here is that we have an ordering constraint on AGF and AGI | |
2446 | * locking - inode allocation locks the AGI, then can allocate a new extent for | |
2447 | * new inodes, locking the AGF after the AGI. Similarly, freeing the inode | |
2448 | * removes the inode from the unlinked list, requiring that we lock the AGI | |
2449 | * first, and then freeing the inode can result in an inode chunk being freed | |
2450 | * and hence freeing disk space requiring that we lock an AGF. | |
2451 | * | |
2452 | * Hence the ordering that is imposed by other parts of the code is AGI before | |
2453 | * AGF. This means we cannot remove the directory entry before we drop the inode | |
2454 | * reference count and put it on the unlinked list as this results in a lock | |
2455 | * order of AGF then AGI, and this can deadlock against inode allocation and | |
2456 | * freeing. Therefore we must drop the link counts before we remove the | |
2457 | * directory entry. | |
2458 | * | |
2459 | * This is still safe from a transactional point of view - it is not until we | |
2460 | * get to xfs_bmap_finish() that we have the possibility of multiple | |
2461 | * transactions in this operation. Hence as long as we remove the directory | |
2462 | * entry and drop the link count in the first transaction of the remove | |
2463 | * operation, there are no transactional constraints on the ordering here. | |
2464 | */ | |
c24b5dfa DC |
2465 | int |
2466 | xfs_remove( | |
2467 | xfs_inode_t *dp, | |
2468 | struct xfs_name *name, | |
2469 | xfs_inode_t *ip) | |
2470 | { | |
2471 | xfs_mount_t *mp = dp->i_mount; | |
2472 | xfs_trans_t *tp = NULL; | |
2473 | int is_dir = S_ISDIR(ip->i_d.di_mode); | |
2474 | int error = 0; | |
2475 | xfs_bmap_free_t free_list; | |
2476 | xfs_fsblock_t first_block; | |
2477 | int cancel_flags; | |
2478 | int committed; | |
c24b5dfa | 2479 | uint resblks; |
c24b5dfa DC |
2480 | |
2481 | trace_xfs_remove(dp, name); | |
2482 | ||
2483 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2451337d | 2484 | return -EIO; |
c24b5dfa DC |
2485 | |
2486 | error = xfs_qm_dqattach(dp, 0); | |
2487 | if (error) | |
2488 | goto std_return; | |
2489 | ||
2490 | error = xfs_qm_dqattach(ip, 0); | |
2491 | if (error) | |
2492 | goto std_return; | |
2493 | ||
32296f86 | 2494 | if (is_dir) |
c24b5dfa | 2495 | tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR); |
32296f86 | 2496 | else |
c24b5dfa | 2497 | tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE); |
c24b5dfa DC |
2498 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; |
2499 | ||
2500 | /* | |
2501 | * We try to get the real space reservation first, | |
2502 | * allowing for directory btree deletion(s) implying | |
2503 | * possible bmap insert(s). If we can't get the space | |
2504 | * reservation then we use 0 instead, and avoid the bmap | |
2505 | * btree insert(s) in the directory code by, if the bmap | |
2506 | * insert tries to happen, instead trimming the LAST | |
2507 | * block from the directory. | |
2508 | */ | |
2509 | resblks = XFS_REMOVE_SPACE_RES(mp); | |
3d3c8b52 | 2510 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_remove, resblks, 0); |
2451337d | 2511 | if (error == -ENOSPC) { |
c24b5dfa | 2512 | resblks = 0; |
3d3c8b52 | 2513 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_remove, 0, 0); |
c24b5dfa DC |
2514 | } |
2515 | if (error) { | |
2451337d | 2516 | ASSERT(error != -ENOSPC); |
c24b5dfa DC |
2517 | cancel_flags = 0; |
2518 | goto out_trans_cancel; | |
2519 | } | |
2520 | ||
2521 | xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL); | |
2522 | ||
2523 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
2524 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
2525 | ||
2526 | /* | |
2527 | * If we're removing a directory perform some additional validation. | |
2528 | */ | |
27320369 | 2529 | cancel_flags |= XFS_TRANS_ABORT; |
c24b5dfa DC |
2530 | if (is_dir) { |
2531 | ASSERT(ip->i_d.di_nlink >= 2); | |
2532 | if (ip->i_d.di_nlink != 2) { | |
2451337d | 2533 | error = -ENOTEMPTY; |
c24b5dfa DC |
2534 | goto out_trans_cancel; |
2535 | } | |
2536 | if (!xfs_dir_isempty(ip)) { | |
2451337d | 2537 | error = -ENOTEMPTY; |
c24b5dfa DC |
2538 | goto out_trans_cancel; |
2539 | } | |
c24b5dfa | 2540 | |
27320369 | 2541 | /* Drop the link from ip's "..". */ |
c24b5dfa DC |
2542 | error = xfs_droplink(tp, dp); |
2543 | if (error) | |
27320369 | 2544 | goto out_trans_cancel; |
c24b5dfa | 2545 | |
27320369 | 2546 | /* Drop the "." link from ip to self. */ |
c24b5dfa DC |
2547 | error = xfs_droplink(tp, ip); |
2548 | if (error) | |
27320369 | 2549 | goto out_trans_cancel; |
c24b5dfa DC |
2550 | } else { |
2551 | /* | |
2552 | * When removing a non-directory we need to log the parent | |
2553 | * inode here. For a directory this is done implicitly | |
2554 | * by the xfs_droplink call for the ".." entry. | |
2555 | */ | |
2556 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
2557 | } | |
27320369 | 2558 | xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
c24b5dfa | 2559 | |
27320369 | 2560 | /* Drop the link from dp to ip. */ |
c24b5dfa DC |
2561 | error = xfs_droplink(tp, ip); |
2562 | if (error) | |
27320369 | 2563 | goto out_trans_cancel; |
c24b5dfa | 2564 | |
27320369 DC |
2565 | xfs_bmap_init(&free_list, &first_block); |
2566 | error = xfs_dir_removename(tp, dp, name, ip->i_ino, | |
2567 | &first_block, &free_list, resblks); | |
2568 | if (error) { | |
2451337d | 2569 | ASSERT(error != -ENOENT); |
27320369 DC |
2570 | goto out_bmap_cancel; |
2571 | } | |
2572 | ||
c24b5dfa DC |
2573 | /* |
2574 | * If this is a synchronous mount, make sure that the | |
2575 | * remove transaction goes to disk before returning to | |
2576 | * the user. | |
2577 | */ | |
2578 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) | |
2579 | xfs_trans_set_sync(tp); | |
2580 | ||
2581 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
2582 | if (error) | |
2583 | goto out_bmap_cancel; | |
2584 | ||
2585 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); | |
2586 | if (error) | |
2587 | goto std_return; | |
2588 | ||
2cd2ef6a | 2589 | if (is_dir && xfs_inode_is_filestream(ip)) |
c24b5dfa DC |
2590 | xfs_filestream_deassociate(ip); |
2591 | ||
2592 | return 0; | |
2593 | ||
2594 | out_bmap_cancel: | |
2595 | xfs_bmap_cancel(&free_list); | |
c24b5dfa DC |
2596 | out_trans_cancel: |
2597 | xfs_trans_cancel(tp, cancel_flags); | |
2598 | std_return: | |
2599 | return error; | |
2600 | } | |
2601 | ||
f6bba201 DC |
2602 | /* |
2603 | * Enter all inodes for a rename transaction into a sorted array. | |
2604 | */ | |
95afcf5c | 2605 | #define __XFS_SORT_INODES 5 |
f6bba201 DC |
2606 | STATIC void |
2607 | xfs_sort_for_rename( | |
95afcf5c DC |
2608 | struct xfs_inode *dp1, /* in: old (source) directory inode */ |
2609 | struct xfs_inode *dp2, /* in: new (target) directory inode */ | |
2610 | struct xfs_inode *ip1, /* in: inode of old entry */ | |
2611 | struct xfs_inode *ip2, /* in: inode of new entry */ | |
2612 | struct xfs_inode *wip, /* in: whiteout inode */ | |
2613 | struct xfs_inode **i_tab,/* out: sorted array of inodes */ | |
2614 | int *num_inodes) /* in/out: inodes in array */ | |
f6bba201 | 2615 | { |
f6bba201 DC |
2616 | int i, j; |
2617 | ||
95afcf5c DC |
2618 | ASSERT(*num_inodes == __XFS_SORT_INODES); |
2619 | memset(i_tab, 0, *num_inodes * sizeof(struct xfs_inode *)); | |
2620 | ||
f6bba201 DC |
2621 | /* |
2622 | * i_tab contains a list of pointers to inodes. We initialize | |
2623 | * the table here & we'll sort it. We will then use it to | |
2624 | * order the acquisition of the inode locks. | |
2625 | * | |
2626 | * Note that the table may contain duplicates. e.g., dp1 == dp2. | |
2627 | */ | |
95afcf5c DC |
2628 | i = 0; |
2629 | i_tab[i++] = dp1; | |
2630 | i_tab[i++] = dp2; | |
2631 | i_tab[i++] = ip1; | |
2632 | if (ip2) | |
2633 | i_tab[i++] = ip2; | |
2634 | if (wip) | |
2635 | i_tab[i++] = wip; | |
2636 | *num_inodes = i; | |
f6bba201 DC |
2637 | |
2638 | /* | |
2639 | * Sort the elements via bubble sort. (Remember, there are at | |
95afcf5c | 2640 | * most 5 elements to sort, so this is adequate.) |
f6bba201 DC |
2641 | */ |
2642 | for (i = 0; i < *num_inodes; i++) { | |
2643 | for (j = 1; j < *num_inodes; j++) { | |
2644 | if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) { | |
95afcf5c | 2645 | struct xfs_inode *temp = i_tab[j]; |
f6bba201 DC |
2646 | i_tab[j] = i_tab[j-1]; |
2647 | i_tab[j-1] = temp; | |
2648 | } | |
2649 | } | |
2650 | } | |
2651 | } | |
2652 | ||
d31a1825 CM |
2653 | /* |
2654 | * xfs_cross_rename() | |
2655 | * | |
2656 | * responsible for handling RENAME_EXCHANGE flag in renameat2() sytemcall | |
2657 | */ | |
2658 | STATIC int | |
2659 | xfs_cross_rename( | |
2660 | struct xfs_trans *tp, | |
2661 | struct xfs_inode *dp1, | |
2662 | struct xfs_name *name1, | |
2663 | struct xfs_inode *ip1, | |
2664 | struct xfs_inode *dp2, | |
2665 | struct xfs_name *name2, | |
2666 | struct xfs_inode *ip2, | |
2667 | struct xfs_bmap_free *free_list, | |
2668 | xfs_fsblock_t *first_block, | |
2669 | int spaceres) | |
2670 | { | |
2671 | int error = 0; | |
2672 | int ip1_flags = 0; | |
2673 | int ip2_flags = 0; | |
2674 | int dp2_flags = 0; | |
2675 | ||
2676 | /* Swap inode number for dirent in first parent */ | |
2677 | error = xfs_dir_replace(tp, dp1, name1, | |
2678 | ip2->i_ino, | |
2679 | first_block, free_list, spaceres); | |
2680 | if (error) | |
2681 | goto out; | |
2682 | ||
2683 | /* Swap inode number for dirent in second parent */ | |
2684 | error = xfs_dir_replace(tp, dp2, name2, | |
2685 | ip1->i_ino, | |
2686 | first_block, free_list, spaceres); | |
2687 | if (error) | |
2688 | goto out; | |
2689 | ||
2690 | /* | |
2691 | * If we're renaming one or more directories across different parents, | |
2692 | * update the respective ".." entries (and link counts) to match the new | |
2693 | * parents. | |
2694 | */ | |
2695 | if (dp1 != dp2) { | |
2696 | dp2_flags = XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG; | |
2697 | ||
2698 | if (S_ISDIR(ip2->i_d.di_mode)) { | |
2699 | error = xfs_dir_replace(tp, ip2, &xfs_name_dotdot, | |
2700 | dp1->i_ino, first_block, | |
2701 | free_list, spaceres); | |
2702 | if (error) | |
2703 | goto out; | |
2704 | ||
2705 | /* transfer ip2 ".." reference to dp1 */ | |
2706 | if (!S_ISDIR(ip1->i_d.di_mode)) { | |
2707 | error = xfs_droplink(tp, dp2); | |
2708 | if (error) | |
2709 | goto out; | |
2710 | error = xfs_bumplink(tp, dp1); | |
2711 | if (error) | |
2712 | goto out; | |
2713 | } | |
2714 | ||
2715 | /* | |
2716 | * Although ip1 isn't changed here, userspace needs | |
2717 | * to be warned about the change, so that applications | |
2718 | * relying on it (like backup ones), will properly | |
2719 | * notify the change | |
2720 | */ | |
2721 | ip1_flags |= XFS_ICHGTIME_CHG; | |
2722 | ip2_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG; | |
2723 | } | |
2724 | ||
2725 | if (S_ISDIR(ip1->i_d.di_mode)) { | |
2726 | error = xfs_dir_replace(tp, ip1, &xfs_name_dotdot, | |
2727 | dp2->i_ino, first_block, | |
2728 | free_list, spaceres); | |
2729 | if (error) | |
2730 | goto out; | |
2731 | ||
2732 | /* transfer ip1 ".." reference to dp2 */ | |
2733 | if (!S_ISDIR(ip2->i_d.di_mode)) { | |
2734 | error = xfs_droplink(tp, dp1); | |
2735 | if (error) | |
2736 | goto out; | |
2737 | error = xfs_bumplink(tp, dp2); | |
2738 | if (error) | |
2739 | goto out; | |
2740 | } | |
2741 | ||
2742 | /* | |
2743 | * Although ip2 isn't changed here, userspace needs | |
2744 | * to be warned about the change, so that applications | |
2745 | * relying on it (like backup ones), will properly | |
2746 | * notify the change | |
2747 | */ | |
2748 | ip1_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG; | |
2749 | ip2_flags |= XFS_ICHGTIME_CHG; | |
2750 | } | |
2751 | } | |
2752 | ||
2753 | if (ip1_flags) { | |
2754 | xfs_trans_ichgtime(tp, ip1, ip1_flags); | |
2755 | xfs_trans_log_inode(tp, ip1, XFS_ILOG_CORE); | |
2756 | } | |
2757 | if (ip2_flags) { | |
2758 | xfs_trans_ichgtime(tp, ip2, ip2_flags); | |
2759 | xfs_trans_log_inode(tp, ip2, XFS_ILOG_CORE); | |
2760 | } | |
2761 | if (dp2_flags) { | |
2762 | xfs_trans_ichgtime(tp, dp2, dp2_flags); | |
2763 | xfs_trans_log_inode(tp, dp2, XFS_ILOG_CORE); | |
2764 | } | |
2765 | xfs_trans_ichgtime(tp, dp1, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
2766 | xfs_trans_log_inode(tp, dp1, XFS_ILOG_CORE); | |
2767 | out: | |
2768 | return error; | |
2769 | } | |
2770 | ||
f6bba201 DC |
2771 | /* |
2772 | * xfs_rename | |
2773 | */ | |
2774 | int | |
2775 | xfs_rename( | |
2776 | xfs_inode_t *src_dp, | |
2777 | struct xfs_name *src_name, | |
2778 | xfs_inode_t *src_ip, | |
2779 | xfs_inode_t *target_dp, | |
2780 | struct xfs_name *target_name, | |
d31a1825 CM |
2781 | xfs_inode_t *target_ip, |
2782 | unsigned int flags) | |
f6bba201 DC |
2783 | { |
2784 | xfs_trans_t *tp = NULL; | |
2785 | xfs_mount_t *mp = src_dp->i_mount; | |
2786 | int new_parent; /* moving to a new dir */ | |
2787 | int src_is_directory; /* src_name is a directory */ | |
2788 | int error; | |
2789 | xfs_bmap_free_t free_list; | |
2790 | xfs_fsblock_t first_block; | |
445883e8 | 2791 | int cancel_flags = 0; |
f6bba201 | 2792 | int committed; |
95afcf5c DC |
2793 | xfs_inode_t *inodes[__XFS_SORT_INODES]; |
2794 | int num_inodes = __XFS_SORT_INODES; | |
f6bba201 | 2795 | int spaceres; |
f6bba201 DC |
2796 | |
2797 | trace_xfs_rename(src_dp, target_dp, src_name, target_name); | |
2798 | ||
2799 | new_parent = (src_dp != target_dp); | |
2800 | src_is_directory = S_ISDIR(src_ip->i_d.di_mode); | |
2801 | ||
95afcf5c | 2802 | xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip, NULL, |
f6bba201 DC |
2803 | inodes, &num_inodes); |
2804 | ||
f6bba201 | 2805 | tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME); |
f6bba201 | 2806 | spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len); |
3d3c8b52 | 2807 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_rename, spaceres, 0); |
2451337d | 2808 | if (error == -ENOSPC) { |
f6bba201 | 2809 | spaceres = 0; |
3d3c8b52 | 2810 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_rename, 0, 0); |
f6bba201 | 2811 | } |
445883e8 DC |
2812 | if (error) |
2813 | goto out_trans_cancel; | |
2814 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
f6bba201 DC |
2815 | |
2816 | /* | |
2817 | * Attach the dquots to the inodes | |
2818 | */ | |
2819 | error = xfs_qm_vop_rename_dqattach(inodes); | |
445883e8 DC |
2820 | if (error) |
2821 | goto out_trans_cancel; | |
f6bba201 DC |
2822 | |
2823 | /* | |
2824 | * Lock all the participating inodes. Depending upon whether | |
2825 | * the target_name exists in the target directory, and | |
2826 | * whether the target directory is the same as the source | |
2827 | * directory, we can lock from 2 to 4 inodes. | |
2828 | */ | |
2829 | xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL); | |
2830 | ||
2831 | /* | |
2832 | * Join all the inodes to the transaction. From this point on, | |
2833 | * we can rely on either trans_commit or trans_cancel to unlock | |
2834 | * them. | |
2835 | */ | |
2836 | xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL); | |
2837 | if (new_parent) | |
2838 | xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL); | |
2839 | xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL); | |
2840 | if (target_ip) | |
2841 | xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL); | |
2842 | ||
2843 | /* | |
2844 | * If we are using project inheritance, we only allow renames | |
2845 | * into our tree when the project IDs are the same; else the | |
2846 | * tree quota mechanism would be circumvented. | |
2847 | */ | |
2848 | if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && | |
2849 | (xfs_get_projid(target_dp) != xfs_get_projid(src_ip)))) { | |
2451337d | 2850 | error = -EXDEV; |
445883e8 | 2851 | goto out_trans_cancel; |
f6bba201 DC |
2852 | } |
2853 | ||
445883e8 DC |
2854 | xfs_bmap_init(&free_list, &first_block); |
2855 | ||
d31a1825 CM |
2856 | /* |
2857 | * Handle RENAME_EXCHANGE flags | |
2858 | */ | |
2859 | if (flags & RENAME_EXCHANGE) { | |
2860 | error = xfs_cross_rename(tp, src_dp, src_name, src_ip, | |
2861 | target_dp, target_name, target_ip, | |
2862 | &free_list, &first_block, spaceres); | |
2863 | if (error) | |
445883e8 | 2864 | goto out_trans_abort; |
d31a1825 CM |
2865 | goto finish_rename; |
2866 | } | |
2867 | ||
f6bba201 DC |
2868 | /* |
2869 | * Set up the target. | |
2870 | */ | |
2871 | if (target_ip == NULL) { | |
2872 | /* | |
2873 | * If there's no space reservation, check the entry will | |
2874 | * fit before actually inserting it. | |
2875 | */ | |
94f3cad5 ES |
2876 | if (!spaceres) { |
2877 | error = xfs_dir_canenter(tp, target_dp, target_name); | |
2878 | if (error) | |
445883e8 | 2879 | goto out_trans_cancel; |
94f3cad5 | 2880 | } |
f6bba201 DC |
2881 | /* |
2882 | * If target does not exist and the rename crosses | |
2883 | * directories, adjust the target directory link count | |
2884 | * to account for the ".." reference from the new entry. | |
2885 | */ | |
2886 | error = xfs_dir_createname(tp, target_dp, target_name, | |
2887 | src_ip->i_ino, &first_block, | |
2888 | &free_list, spaceres); | |
2451337d | 2889 | if (error == -ENOSPC) |
445883e8 | 2890 | goto out_bmap_cancel; |
f6bba201 | 2891 | if (error) |
445883e8 | 2892 | goto out_trans_abort; |
f6bba201 DC |
2893 | |
2894 | xfs_trans_ichgtime(tp, target_dp, | |
2895 | XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
2896 | ||
2897 | if (new_parent && src_is_directory) { | |
2898 | error = xfs_bumplink(tp, target_dp); | |
2899 | if (error) | |
445883e8 | 2900 | goto out_trans_abort; |
f6bba201 DC |
2901 | } |
2902 | } else { /* target_ip != NULL */ | |
2903 | /* | |
2904 | * If target exists and it's a directory, check that both | |
2905 | * target and source are directories and that target can be | |
2906 | * destroyed, or that neither is a directory. | |
2907 | */ | |
2908 | if (S_ISDIR(target_ip->i_d.di_mode)) { | |
2909 | /* | |
2910 | * Make sure target dir is empty. | |
2911 | */ | |
2912 | if (!(xfs_dir_isempty(target_ip)) || | |
2913 | (target_ip->i_d.di_nlink > 2)) { | |
2451337d | 2914 | error = -EEXIST; |
445883e8 | 2915 | goto out_trans_cancel; |
f6bba201 DC |
2916 | } |
2917 | } | |
2918 | ||
2919 | /* | |
2920 | * Link the source inode under the target name. | |
2921 | * If the source inode is a directory and we are moving | |
2922 | * it across directories, its ".." entry will be | |
2923 | * inconsistent until we replace that down below. | |
2924 | * | |
2925 | * In case there is already an entry with the same | |
2926 | * name at the destination directory, remove it first. | |
2927 | */ | |
2928 | error = xfs_dir_replace(tp, target_dp, target_name, | |
2929 | src_ip->i_ino, | |
2930 | &first_block, &free_list, spaceres); | |
2931 | if (error) | |
445883e8 | 2932 | goto out_trans_abort; |
f6bba201 DC |
2933 | |
2934 | xfs_trans_ichgtime(tp, target_dp, | |
2935 | XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
2936 | ||
2937 | /* | |
2938 | * Decrement the link count on the target since the target | |
2939 | * dir no longer points to it. | |
2940 | */ | |
2941 | error = xfs_droplink(tp, target_ip); | |
2942 | if (error) | |
445883e8 | 2943 | goto out_trans_abort; |
f6bba201 DC |
2944 | |
2945 | if (src_is_directory) { | |
2946 | /* | |
2947 | * Drop the link from the old "." entry. | |
2948 | */ | |
2949 | error = xfs_droplink(tp, target_ip); | |
2950 | if (error) | |
445883e8 | 2951 | goto out_trans_abort; |
f6bba201 DC |
2952 | } |
2953 | } /* target_ip != NULL */ | |
2954 | ||
2955 | /* | |
2956 | * Remove the source. | |
2957 | */ | |
2958 | if (new_parent && src_is_directory) { | |
2959 | /* | |
2960 | * Rewrite the ".." entry to point to the new | |
2961 | * directory. | |
2962 | */ | |
2963 | error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot, | |
2964 | target_dp->i_ino, | |
2965 | &first_block, &free_list, spaceres); | |
2451337d | 2966 | ASSERT(error != -EEXIST); |
f6bba201 | 2967 | if (error) |
445883e8 | 2968 | goto out_trans_abort; |
f6bba201 DC |
2969 | } |
2970 | ||
2971 | /* | |
2972 | * We always want to hit the ctime on the source inode. | |
2973 | * | |
2974 | * This isn't strictly required by the standards since the source | |
2975 | * inode isn't really being changed, but old unix file systems did | |
2976 | * it and some incremental backup programs won't work without it. | |
2977 | */ | |
2978 | xfs_trans_ichgtime(tp, src_ip, XFS_ICHGTIME_CHG); | |
2979 | xfs_trans_log_inode(tp, src_ip, XFS_ILOG_CORE); | |
2980 | ||
2981 | /* | |
2982 | * Adjust the link count on src_dp. This is necessary when | |
2983 | * renaming a directory, either within one parent when | |
2984 | * the target existed, or across two parent directories. | |
2985 | */ | |
2986 | if (src_is_directory && (new_parent || target_ip != NULL)) { | |
2987 | ||
2988 | /* | |
2989 | * Decrement link count on src_directory since the | |
2990 | * entry that's moved no longer points to it. | |
2991 | */ | |
2992 | error = xfs_droplink(tp, src_dp); | |
2993 | if (error) | |
445883e8 | 2994 | goto out_trans_abort; |
f6bba201 DC |
2995 | } |
2996 | ||
2997 | error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino, | |
2998 | &first_block, &free_list, spaceres); | |
2999 | if (error) | |
445883e8 | 3000 | goto out_trans_abort; |
f6bba201 DC |
3001 | |
3002 | xfs_trans_ichgtime(tp, src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
3003 | xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE); | |
3004 | if (new_parent) | |
3005 | xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE); | |
3006 | ||
d31a1825 | 3007 | finish_rename: |
f6bba201 DC |
3008 | /* |
3009 | * If this is a synchronous mount, make sure that the | |
3010 | * rename transaction goes to disk before returning to | |
3011 | * the user. | |
3012 | */ | |
3013 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
3014 | xfs_trans_set_sync(tp); | |
3015 | } | |
3016 | ||
3017 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
445883e8 DC |
3018 | if (error) |
3019 | goto out_trans_abort; | |
f6bba201 DC |
3020 | |
3021 | /* | |
3022 | * trans_commit will unlock src_ip, target_ip & decrement | |
3023 | * the vnode references. | |
3024 | */ | |
3025 | return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); | |
3026 | ||
445883e8 | 3027 | out_trans_abort: |
f6bba201 | 3028 | cancel_flags |= XFS_TRANS_ABORT; |
445883e8 | 3029 | out_bmap_cancel: |
f6bba201 | 3030 | xfs_bmap_cancel(&free_list); |
445883e8 | 3031 | out_trans_cancel: |
f6bba201 | 3032 | xfs_trans_cancel(tp, cancel_flags); |
f6bba201 DC |
3033 | return error; |
3034 | } | |
3035 | ||
5c4d97d0 DC |
3036 | STATIC int |
3037 | xfs_iflush_cluster( | |
3038 | xfs_inode_t *ip, | |
3039 | xfs_buf_t *bp) | |
1da177e4 | 3040 | { |
5c4d97d0 DC |
3041 | xfs_mount_t *mp = ip->i_mount; |
3042 | struct xfs_perag *pag; | |
3043 | unsigned long first_index, mask; | |
3044 | unsigned long inodes_per_cluster; | |
3045 | int ilist_size; | |
3046 | xfs_inode_t **ilist; | |
3047 | xfs_inode_t *iq; | |
3048 | int nr_found; | |
3049 | int clcount = 0; | |
3050 | int bufwasdelwri; | |
1da177e4 | 3051 | int i; |
1da177e4 | 3052 | |
5c4d97d0 | 3053 | pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino)); |
1da177e4 | 3054 | |
0f49efd8 | 3055 | inodes_per_cluster = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog; |
5c4d97d0 DC |
3056 | ilist_size = inodes_per_cluster * sizeof(xfs_inode_t *); |
3057 | ilist = kmem_alloc(ilist_size, KM_MAYFAIL|KM_NOFS); | |
3058 | if (!ilist) | |
3059 | goto out_put; | |
1da177e4 | 3060 | |
0f49efd8 | 3061 | mask = ~(((mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog)) - 1); |
5c4d97d0 DC |
3062 | first_index = XFS_INO_TO_AGINO(mp, ip->i_ino) & mask; |
3063 | rcu_read_lock(); | |
3064 | /* really need a gang lookup range call here */ | |
3065 | nr_found = radix_tree_gang_lookup(&pag->pag_ici_root, (void**)ilist, | |
3066 | first_index, inodes_per_cluster); | |
3067 | if (nr_found == 0) | |
3068 | goto out_free; | |
3069 | ||
3070 | for (i = 0; i < nr_found; i++) { | |
3071 | iq = ilist[i]; | |
3072 | if (iq == ip) | |
bad55843 | 3073 | continue; |
1a3e8f3d DC |
3074 | |
3075 | /* | |
3076 | * because this is an RCU protected lookup, we could find a | |
3077 | * recently freed or even reallocated inode during the lookup. | |
3078 | * We need to check under the i_flags_lock for a valid inode | |
3079 | * here. Skip it if it is not valid or the wrong inode. | |
3080 | */ | |
3081 | spin_lock(&ip->i_flags_lock); | |
3082 | if (!ip->i_ino || | |
3083 | (XFS_INO_TO_AGINO(mp, iq->i_ino) & mask) != first_index) { | |
3084 | spin_unlock(&ip->i_flags_lock); | |
3085 | continue; | |
3086 | } | |
3087 | spin_unlock(&ip->i_flags_lock); | |
3088 | ||
bad55843 DC |
3089 | /* |
3090 | * Do an un-protected check to see if the inode is dirty and | |
3091 | * is a candidate for flushing. These checks will be repeated | |
3092 | * later after the appropriate locks are acquired. | |
3093 | */ | |
33540408 | 3094 | if (xfs_inode_clean(iq) && xfs_ipincount(iq) == 0) |
bad55843 | 3095 | continue; |
bad55843 DC |
3096 | |
3097 | /* | |
3098 | * Try to get locks. If any are unavailable or it is pinned, | |
3099 | * then this inode cannot be flushed and is skipped. | |
3100 | */ | |
3101 | ||
3102 | if (!xfs_ilock_nowait(iq, XFS_ILOCK_SHARED)) | |
3103 | continue; | |
3104 | if (!xfs_iflock_nowait(iq)) { | |
3105 | xfs_iunlock(iq, XFS_ILOCK_SHARED); | |
3106 | continue; | |
3107 | } | |
3108 | if (xfs_ipincount(iq)) { | |
3109 | xfs_ifunlock(iq); | |
3110 | xfs_iunlock(iq, XFS_ILOCK_SHARED); | |
3111 | continue; | |
3112 | } | |
3113 | ||
3114 | /* | |
3115 | * arriving here means that this inode can be flushed. First | |
3116 | * re-check that it's dirty before flushing. | |
3117 | */ | |
33540408 DC |
3118 | if (!xfs_inode_clean(iq)) { |
3119 | int error; | |
bad55843 DC |
3120 | error = xfs_iflush_int(iq, bp); |
3121 | if (error) { | |
3122 | xfs_iunlock(iq, XFS_ILOCK_SHARED); | |
3123 | goto cluster_corrupt_out; | |
3124 | } | |
3125 | clcount++; | |
3126 | } else { | |
3127 | xfs_ifunlock(iq); | |
3128 | } | |
3129 | xfs_iunlock(iq, XFS_ILOCK_SHARED); | |
3130 | } | |
3131 | ||
3132 | if (clcount) { | |
3133 | XFS_STATS_INC(xs_icluster_flushcnt); | |
3134 | XFS_STATS_ADD(xs_icluster_flushinode, clcount); | |
3135 | } | |
3136 | ||
3137 | out_free: | |
1a3e8f3d | 3138 | rcu_read_unlock(); |
f0e2d93c | 3139 | kmem_free(ilist); |
44b56e0a DC |
3140 | out_put: |
3141 | xfs_perag_put(pag); | |
bad55843 DC |
3142 | return 0; |
3143 | ||
3144 | ||
3145 | cluster_corrupt_out: | |
3146 | /* | |
3147 | * Corruption detected in the clustering loop. Invalidate the | |
3148 | * inode buffer and shut down the filesystem. | |
3149 | */ | |
1a3e8f3d | 3150 | rcu_read_unlock(); |
bad55843 | 3151 | /* |
43ff2122 | 3152 | * Clean up the buffer. If it was delwri, just release it -- |
bad55843 DC |
3153 | * brelse can handle it with no problems. If not, shut down the |
3154 | * filesystem before releasing the buffer. | |
3155 | */ | |
43ff2122 | 3156 | bufwasdelwri = (bp->b_flags & _XBF_DELWRI_Q); |
bad55843 DC |
3157 | if (bufwasdelwri) |
3158 | xfs_buf_relse(bp); | |
3159 | ||
3160 | xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); | |
3161 | ||
3162 | if (!bufwasdelwri) { | |
3163 | /* | |
3164 | * Just like incore_relse: if we have b_iodone functions, | |
3165 | * mark the buffer as an error and call them. Otherwise | |
3166 | * mark it as stale and brelse. | |
3167 | */ | |
cb669ca5 | 3168 | if (bp->b_iodone) { |
bad55843 | 3169 | XFS_BUF_UNDONE(bp); |
c867cb61 | 3170 | xfs_buf_stale(bp); |
2451337d | 3171 | xfs_buf_ioerror(bp, -EIO); |
e8aaba9a | 3172 | xfs_buf_ioend(bp); |
bad55843 | 3173 | } else { |
c867cb61 | 3174 | xfs_buf_stale(bp); |
bad55843 DC |
3175 | xfs_buf_relse(bp); |
3176 | } | |
3177 | } | |
3178 | ||
3179 | /* | |
3180 | * Unlocks the flush lock | |
3181 | */ | |
04913fdd | 3182 | xfs_iflush_abort(iq, false); |
f0e2d93c | 3183 | kmem_free(ilist); |
44b56e0a | 3184 | xfs_perag_put(pag); |
2451337d | 3185 | return -EFSCORRUPTED; |
bad55843 DC |
3186 | } |
3187 | ||
1da177e4 | 3188 | /* |
4c46819a CH |
3189 | * Flush dirty inode metadata into the backing buffer. |
3190 | * | |
3191 | * The caller must have the inode lock and the inode flush lock held. The | |
3192 | * inode lock will still be held upon return to the caller, and the inode | |
3193 | * flush lock will be released after the inode has reached the disk. | |
3194 | * | |
3195 | * The caller must write out the buffer returned in *bpp and release it. | |
1da177e4 LT |
3196 | */ |
3197 | int | |
3198 | xfs_iflush( | |
4c46819a CH |
3199 | struct xfs_inode *ip, |
3200 | struct xfs_buf **bpp) | |
1da177e4 | 3201 | { |
4c46819a CH |
3202 | struct xfs_mount *mp = ip->i_mount; |
3203 | struct xfs_buf *bp; | |
3204 | struct xfs_dinode *dip; | |
1da177e4 | 3205 | int error; |
1da177e4 LT |
3206 | |
3207 | XFS_STATS_INC(xs_iflush_count); | |
3208 | ||
579aa9ca | 3209 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)); |
474fce06 | 3210 | ASSERT(xfs_isiflocked(ip)); |
1da177e4 | 3211 | ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || |
8096b1eb | 3212 | ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK)); |
1da177e4 | 3213 | |
4c46819a | 3214 | *bpp = NULL; |
1da177e4 | 3215 | |
1da177e4 LT |
3216 | xfs_iunpin_wait(ip); |
3217 | ||
4b6a4688 DC |
3218 | /* |
3219 | * For stale inodes we cannot rely on the backing buffer remaining | |
3220 | * stale in cache for the remaining life of the stale inode and so | |
475ee413 | 3221 | * xfs_imap_to_bp() below may give us a buffer that no longer contains |
4b6a4688 DC |
3222 | * inodes below. We have to check this after ensuring the inode is |
3223 | * unpinned so that it is safe to reclaim the stale inode after the | |
3224 | * flush call. | |
3225 | */ | |
3226 | if (xfs_iflags_test(ip, XFS_ISTALE)) { | |
3227 | xfs_ifunlock(ip); | |
3228 | return 0; | |
3229 | } | |
3230 | ||
1da177e4 LT |
3231 | /* |
3232 | * This may have been unpinned because the filesystem is shutting | |
3233 | * down forcibly. If that's the case we must not write this inode | |
32ce90a4 CH |
3234 | * to disk, because the log record didn't make it to disk. |
3235 | * | |
3236 | * We also have to remove the log item from the AIL in this case, | |
3237 | * as we wait for an empty AIL as part of the unmount process. | |
1da177e4 LT |
3238 | */ |
3239 | if (XFS_FORCED_SHUTDOWN(mp)) { | |
2451337d | 3240 | error = -EIO; |
32ce90a4 | 3241 | goto abort_out; |
1da177e4 LT |
3242 | } |
3243 | ||
a3f74ffb DC |
3244 | /* |
3245 | * Get the buffer containing the on-disk inode. | |
3246 | */ | |
475ee413 CH |
3247 | error = xfs_imap_to_bp(mp, NULL, &ip->i_imap, &dip, &bp, XBF_TRYLOCK, |
3248 | 0); | |
a3f74ffb DC |
3249 | if (error || !bp) { |
3250 | xfs_ifunlock(ip); | |
3251 | return error; | |
3252 | } | |
3253 | ||
1da177e4 LT |
3254 | /* |
3255 | * First flush out the inode that xfs_iflush was called with. | |
3256 | */ | |
3257 | error = xfs_iflush_int(ip, bp); | |
bad55843 | 3258 | if (error) |
1da177e4 | 3259 | goto corrupt_out; |
1da177e4 | 3260 | |
a3f74ffb DC |
3261 | /* |
3262 | * If the buffer is pinned then push on the log now so we won't | |
3263 | * get stuck waiting in the write for too long. | |
3264 | */ | |
811e64c7 | 3265 | if (xfs_buf_ispinned(bp)) |
a14a348b | 3266 | xfs_log_force(mp, 0); |
a3f74ffb | 3267 | |
1da177e4 LT |
3268 | /* |
3269 | * inode clustering: | |
3270 | * see if other inodes can be gathered into this write | |
3271 | */ | |
bad55843 DC |
3272 | error = xfs_iflush_cluster(ip, bp); |
3273 | if (error) | |
3274 | goto cluster_corrupt_out; | |
1da177e4 | 3275 | |
4c46819a CH |
3276 | *bpp = bp; |
3277 | return 0; | |
1da177e4 LT |
3278 | |
3279 | corrupt_out: | |
3280 | xfs_buf_relse(bp); | |
7d04a335 | 3281 | xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); |
1da177e4 | 3282 | cluster_corrupt_out: |
2451337d | 3283 | error = -EFSCORRUPTED; |
32ce90a4 | 3284 | abort_out: |
1da177e4 LT |
3285 | /* |
3286 | * Unlocks the flush lock | |
3287 | */ | |
04913fdd | 3288 | xfs_iflush_abort(ip, false); |
32ce90a4 | 3289 | return error; |
1da177e4 LT |
3290 | } |
3291 | ||
1da177e4 LT |
3292 | STATIC int |
3293 | xfs_iflush_int( | |
93848a99 CH |
3294 | struct xfs_inode *ip, |
3295 | struct xfs_buf *bp) | |
1da177e4 | 3296 | { |
93848a99 CH |
3297 | struct xfs_inode_log_item *iip = ip->i_itemp; |
3298 | struct xfs_dinode *dip; | |
3299 | struct xfs_mount *mp = ip->i_mount; | |
1da177e4 | 3300 | |
579aa9ca | 3301 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)); |
474fce06 | 3302 | ASSERT(xfs_isiflocked(ip)); |
1da177e4 | 3303 | ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || |
8096b1eb | 3304 | ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK)); |
93848a99 | 3305 | ASSERT(iip != NULL && iip->ili_fields != 0); |
263997a6 | 3306 | ASSERT(ip->i_d.di_version > 1); |
1da177e4 | 3307 | |
1da177e4 | 3308 | /* set *dip = inode's place in the buffer */ |
92bfc6e7 | 3309 | dip = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset); |
1da177e4 | 3310 | |
69ef921b | 3311 | if (XFS_TEST_ERROR(dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC), |
1da177e4 | 3312 | mp, XFS_ERRTAG_IFLUSH_1, XFS_RANDOM_IFLUSH_1)) { |
6a19d939 DC |
3313 | xfs_alert_tag(mp, XFS_PTAG_IFLUSH, |
3314 | "%s: Bad inode %Lu magic number 0x%x, ptr 0x%p", | |
3315 | __func__, ip->i_ino, be16_to_cpu(dip->di_magic), dip); | |
1da177e4 LT |
3316 | goto corrupt_out; |
3317 | } | |
3318 | if (XFS_TEST_ERROR(ip->i_d.di_magic != XFS_DINODE_MAGIC, | |
3319 | mp, XFS_ERRTAG_IFLUSH_2, XFS_RANDOM_IFLUSH_2)) { | |
6a19d939 DC |
3320 | xfs_alert_tag(mp, XFS_PTAG_IFLUSH, |
3321 | "%s: Bad inode %Lu, ptr 0x%p, magic number 0x%x", | |
3322 | __func__, ip->i_ino, ip, ip->i_d.di_magic); | |
1da177e4 LT |
3323 | goto corrupt_out; |
3324 | } | |
abbede1b | 3325 | if (S_ISREG(ip->i_d.di_mode)) { |
1da177e4 LT |
3326 | if (XFS_TEST_ERROR( |
3327 | (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) && | |
3328 | (ip->i_d.di_format != XFS_DINODE_FMT_BTREE), | |
3329 | mp, XFS_ERRTAG_IFLUSH_3, XFS_RANDOM_IFLUSH_3)) { | |
6a19d939 DC |
3330 | xfs_alert_tag(mp, XFS_PTAG_IFLUSH, |
3331 | "%s: Bad regular inode %Lu, ptr 0x%p", | |
3332 | __func__, ip->i_ino, ip); | |
1da177e4 LT |
3333 | goto corrupt_out; |
3334 | } | |
abbede1b | 3335 | } else if (S_ISDIR(ip->i_d.di_mode)) { |
1da177e4 LT |
3336 | if (XFS_TEST_ERROR( |
3337 | (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) && | |
3338 | (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) && | |
3339 | (ip->i_d.di_format != XFS_DINODE_FMT_LOCAL), | |
3340 | mp, XFS_ERRTAG_IFLUSH_4, XFS_RANDOM_IFLUSH_4)) { | |
6a19d939 DC |
3341 | xfs_alert_tag(mp, XFS_PTAG_IFLUSH, |
3342 | "%s: Bad directory inode %Lu, ptr 0x%p", | |
3343 | __func__, ip->i_ino, ip); | |
1da177e4 LT |
3344 | goto corrupt_out; |
3345 | } | |
3346 | } | |
3347 | if (XFS_TEST_ERROR(ip->i_d.di_nextents + ip->i_d.di_anextents > | |
3348 | ip->i_d.di_nblocks, mp, XFS_ERRTAG_IFLUSH_5, | |
3349 | XFS_RANDOM_IFLUSH_5)) { | |
6a19d939 DC |
3350 | xfs_alert_tag(mp, XFS_PTAG_IFLUSH, |
3351 | "%s: detected corrupt incore inode %Lu, " | |
3352 | "total extents = %d, nblocks = %Ld, ptr 0x%p", | |
3353 | __func__, ip->i_ino, | |
1da177e4 | 3354 | ip->i_d.di_nextents + ip->i_d.di_anextents, |
6a19d939 | 3355 | ip->i_d.di_nblocks, ip); |
1da177e4 LT |
3356 | goto corrupt_out; |
3357 | } | |
3358 | if (XFS_TEST_ERROR(ip->i_d.di_forkoff > mp->m_sb.sb_inodesize, | |
3359 | mp, XFS_ERRTAG_IFLUSH_6, XFS_RANDOM_IFLUSH_6)) { | |
6a19d939 DC |
3360 | xfs_alert_tag(mp, XFS_PTAG_IFLUSH, |
3361 | "%s: bad inode %Lu, forkoff 0x%x, ptr 0x%p", | |
3362 | __func__, ip->i_ino, ip->i_d.di_forkoff, ip); | |
1da177e4 LT |
3363 | goto corrupt_out; |
3364 | } | |
e60896d8 | 3365 | |
1da177e4 | 3366 | /* |
263997a6 | 3367 | * Inode item log recovery for v2 inodes are dependent on the |
e60896d8 DC |
3368 | * di_flushiter count for correct sequencing. We bump the flush |
3369 | * iteration count so we can detect flushes which postdate a log record | |
3370 | * during recovery. This is redundant as we now log every change and | |
3371 | * hence this can't happen but we need to still do it to ensure | |
3372 | * backwards compatibility with old kernels that predate logging all | |
3373 | * inode changes. | |
1da177e4 | 3374 | */ |
e60896d8 DC |
3375 | if (ip->i_d.di_version < 3) |
3376 | ip->i_d.di_flushiter++; | |
1da177e4 LT |
3377 | |
3378 | /* | |
3379 | * Copy the dirty parts of the inode into the on-disk | |
3380 | * inode. We always copy out the core of the inode, | |
3381 | * because if the inode is dirty at all the core must | |
3382 | * be. | |
3383 | */ | |
81591fe2 | 3384 | xfs_dinode_to_disk(dip, &ip->i_d); |
1da177e4 LT |
3385 | |
3386 | /* Wrap, we never let the log put out DI_MAX_FLUSH */ | |
3387 | if (ip->i_d.di_flushiter == DI_MAX_FLUSH) | |
3388 | ip->i_d.di_flushiter = 0; | |
3389 | ||
fd9fdba6 | 3390 | xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK); |
e4ac967b | 3391 | if (XFS_IFORK_Q(ip)) |
fd9fdba6 | 3392 | xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK); |
1da177e4 LT |
3393 | xfs_inobp_check(mp, bp); |
3394 | ||
3395 | /* | |
f5d8d5c4 CH |
3396 | * We've recorded everything logged in the inode, so we'd like to clear |
3397 | * the ili_fields bits so we don't log and flush things unnecessarily. | |
3398 | * However, we can't stop logging all this information until the data | |
3399 | * we've copied into the disk buffer is written to disk. If we did we | |
3400 | * might overwrite the copy of the inode in the log with all the data | |
3401 | * after re-logging only part of it, and in the face of a crash we | |
3402 | * wouldn't have all the data we need to recover. | |
1da177e4 | 3403 | * |
f5d8d5c4 CH |
3404 | * What we do is move the bits to the ili_last_fields field. When |
3405 | * logging the inode, these bits are moved back to the ili_fields field. | |
3406 | * In the xfs_iflush_done() routine we clear ili_last_fields, since we | |
3407 | * know that the information those bits represent is permanently on | |
3408 | * disk. As long as the flush completes before the inode is logged | |
3409 | * again, then both ili_fields and ili_last_fields will be cleared. | |
1da177e4 | 3410 | * |
f5d8d5c4 CH |
3411 | * We can play with the ili_fields bits here, because the inode lock |
3412 | * must be held exclusively in order to set bits there and the flush | |
3413 | * lock protects the ili_last_fields bits. Set ili_logged so the flush | |
3414 | * done routine can tell whether or not to look in the AIL. Also, store | |
3415 | * the current LSN of the inode so that we can tell whether the item has | |
3416 | * moved in the AIL from xfs_iflush_done(). In order to read the lsn we | |
3417 | * need the AIL lock, because it is a 64 bit value that cannot be read | |
3418 | * atomically. | |
1da177e4 | 3419 | */ |
93848a99 CH |
3420 | iip->ili_last_fields = iip->ili_fields; |
3421 | iip->ili_fields = 0; | |
3422 | iip->ili_logged = 1; | |
1da177e4 | 3423 | |
93848a99 CH |
3424 | xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn, |
3425 | &iip->ili_item.li_lsn); | |
1da177e4 | 3426 | |
93848a99 CH |
3427 | /* |
3428 | * Attach the function xfs_iflush_done to the inode's | |
3429 | * buffer. This will remove the inode from the AIL | |
3430 | * and unlock the inode's flush lock when the inode is | |
3431 | * completely written to disk. | |
3432 | */ | |
3433 | xfs_buf_attach_iodone(bp, xfs_iflush_done, &iip->ili_item); | |
1da177e4 | 3434 | |
93848a99 CH |
3435 | /* update the lsn in the on disk inode if required */ |
3436 | if (ip->i_d.di_version == 3) | |
3437 | dip->di_lsn = cpu_to_be64(iip->ili_item.li_lsn); | |
3438 | ||
3439 | /* generate the checksum. */ | |
3440 | xfs_dinode_calc_crc(mp, dip); | |
1da177e4 | 3441 | |
93848a99 CH |
3442 | ASSERT(bp->b_fspriv != NULL); |
3443 | ASSERT(bp->b_iodone != NULL); | |
1da177e4 LT |
3444 | return 0; |
3445 | ||
3446 | corrupt_out: | |
2451337d | 3447 | return -EFSCORRUPTED; |
1da177e4 | 3448 | } |