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 | /* | |
653c60b6 DC |
120 | * The xfs inode contains 3 multi-reader locks: the i_iolock the i_mmap_lock and |
121 | * the i_lock. This routine allows various combinations of the locks to be | |
122 | * obtained. | |
fa96acad | 123 | * |
653c60b6 DC |
124 | * The 3 locks should always be ordered so that the IO lock is obtained first, |
125 | * the mmap lock second and the ilock last in order to prevent deadlock. | |
fa96acad | 126 | * |
653c60b6 DC |
127 | * Basic locking order: |
128 | * | |
129 | * i_iolock -> i_mmap_lock -> page_lock -> i_ilock | |
130 | * | |
131 | * mmap_sem locking order: | |
132 | * | |
133 | * i_iolock -> page lock -> mmap_sem | |
134 | * mmap_sem -> i_mmap_lock -> page_lock | |
135 | * | |
136 | * The difference in mmap_sem locking order mean that we cannot hold the | |
137 | * i_mmap_lock over syscall based read(2)/write(2) based IO. These IO paths can | |
138 | * fault in pages during copy in/out (for buffered IO) or require the mmap_sem | |
139 | * in get_user_pages() to map the user pages into the kernel address space for | |
140 | * direct IO. Similarly the i_iolock cannot be taken inside a page fault because | |
141 | * page faults already hold the mmap_sem. | |
142 | * | |
143 | * Hence to serialise fully against both syscall and mmap based IO, we need to | |
144 | * take both the i_iolock and the i_mmap_lock. These locks should *only* be both | |
145 | * taken in places where we need to invalidate the page cache in a race | |
146 | * free manner (e.g. truncate, hole punch and other extent manipulation | |
147 | * functions). | |
fa96acad DC |
148 | */ |
149 | void | |
150 | xfs_ilock( | |
151 | xfs_inode_t *ip, | |
152 | uint lock_flags) | |
153 | { | |
154 | trace_xfs_ilock(ip, lock_flags, _RET_IP_); | |
155 | ||
156 | /* | |
157 | * You can't set both SHARED and EXCL for the same lock, | |
158 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
159 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
160 | */ | |
161 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
162 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
653c60b6 DC |
163 | ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) != |
164 | (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)); | |
fa96acad DC |
165 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != |
166 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
167 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); | |
168 | ||
169 | if (lock_flags & XFS_IOLOCK_EXCL) | |
170 | mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags)); | |
171 | else if (lock_flags & XFS_IOLOCK_SHARED) | |
172 | mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags)); | |
173 | ||
653c60b6 DC |
174 | if (lock_flags & XFS_MMAPLOCK_EXCL) |
175 | mrupdate_nested(&ip->i_mmaplock, XFS_MMAPLOCK_DEP(lock_flags)); | |
176 | else if (lock_flags & XFS_MMAPLOCK_SHARED) | |
177 | mraccess_nested(&ip->i_mmaplock, XFS_MMAPLOCK_DEP(lock_flags)); | |
178 | ||
fa96acad DC |
179 | if (lock_flags & XFS_ILOCK_EXCL) |
180 | mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags)); | |
181 | else if (lock_flags & XFS_ILOCK_SHARED) | |
182 | mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags)); | |
183 | } | |
184 | ||
185 | /* | |
186 | * This is just like xfs_ilock(), except that the caller | |
187 | * is guaranteed not to sleep. It returns 1 if it gets | |
188 | * the requested locks and 0 otherwise. If the IO lock is | |
189 | * obtained but the inode lock cannot be, then the IO lock | |
190 | * is dropped before returning. | |
191 | * | |
192 | * ip -- the inode being locked | |
193 | * lock_flags -- this parameter indicates the inode's locks to be | |
194 | * to be locked. See the comment for xfs_ilock() for a list | |
195 | * of valid values. | |
196 | */ | |
197 | int | |
198 | xfs_ilock_nowait( | |
199 | xfs_inode_t *ip, | |
200 | uint lock_flags) | |
201 | { | |
202 | trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_); | |
203 | ||
204 | /* | |
205 | * You can't set both SHARED and EXCL for the same lock, | |
206 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
207 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
208 | */ | |
209 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
210 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
653c60b6 DC |
211 | ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) != |
212 | (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)); | |
fa96acad DC |
213 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != |
214 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
215 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); | |
216 | ||
217 | if (lock_flags & XFS_IOLOCK_EXCL) { | |
218 | if (!mrtryupdate(&ip->i_iolock)) | |
219 | goto out; | |
220 | } else if (lock_flags & XFS_IOLOCK_SHARED) { | |
221 | if (!mrtryaccess(&ip->i_iolock)) | |
222 | goto out; | |
223 | } | |
653c60b6 DC |
224 | |
225 | if (lock_flags & XFS_MMAPLOCK_EXCL) { | |
226 | if (!mrtryupdate(&ip->i_mmaplock)) | |
227 | goto out_undo_iolock; | |
228 | } else if (lock_flags & XFS_MMAPLOCK_SHARED) { | |
229 | if (!mrtryaccess(&ip->i_mmaplock)) | |
230 | goto out_undo_iolock; | |
231 | } | |
232 | ||
fa96acad DC |
233 | if (lock_flags & XFS_ILOCK_EXCL) { |
234 | if (!mrtryupdate(&ip->i_lock)) | |
653c60b6 | 235 | goto out_undo_mmaplock; |
fa96acad DC |
236 | } else if (lock_flags & XFS_ILOCK_SHARED) { |
237 | if (!mrtryaccess(&ip->i_lock)) | |
653c60b6 | 238 | goto out_undo_mmaplock; |
fa96acad DC |
239 | } |
240 | return 1; | |
241 | ||
653c60b6 DC |
242 | out_undo_mmaplock: |
243 | if (lock_flags & XFS_MMAPLOCK_EXCL) | |
244 | mrunlock_excl(&ip->i_mmaplock); | |
245 | else if (lock_flags & XFS_MMAPLOCK_SHARED) | |
246 | mrunlock_shared(&ip->i_mmaplock); | |
247 | out_undo_iolock: | |
fa96acad DC |
248 | if (lock_flags & XFS_IOLOCK_EXCL) |
249 | mrunlock_excl(&ip->i_iolock); | |
250 | else if (lock_flags & XFS_IOLOCK_SHARED) | |
251 | mrunlock_shared(&ip->i_iolock); | |
653c60b6 | 252 | out: |
fa96acad DC |
253 | return 0; |
254 | } | |
255 | ||
256 | /* | |
257 | * xfs_iunlock() is used to drop the inode locks acquired with | |
258 | * xfs_ilock() and xfs_ilock_nowait(). The caller must pass | |
259 | * in the flags given to xfs_ilock() or xfs_ilock_nowait() so | |
260 | * that we know which locks to drop. | |
261 | * | |
262 | * ip -- the inode being unlocked | |
263 | * lock_flags -- this parameter indicates the inode's locks to be | |
264 | * to be unlocked. See the comment for xfs_ilock() for a list | |
265 | * of valid values for this parameter. | |
266 | * | |
267 | */ | |
268 | void | |
269 | xfs_iunlock( | |
270 | xfs_inode_t *ip, | |
271 | uint lock_flags) | |
272 | { | |
273 | /* | |
274 | * You can't set both SHARED and EXCL for the same lock, | |
275 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
276 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
277 | */ | |
278 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
279 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
653c60b6 DC |
280 | ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) != |
281 | (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)); | |
fa96acad DC |
282 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != |
283 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
284 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); | |
285 | ASSERT(lock_flags != 0); | |
286 | ||
287 | if (lock_flags & XFS_IOLOCK_EXCL) | |
288 | mrunlock_excl(&ip->i_iolock); | |
289 | else if (lock_flags & XFS_IOLOCK_SHARED) | |
290 | mrunlock_shared(&ip->i_iolock); | |
291 | ||
653c60b6 DC |
292 | if (lock_flags & XFS_MMAPLOCK_EXCL) |
293 | mrunlock_excl(&ip->i_mmaplock); | |
294 | else if (lock_flags & XFS_MMAPLOCK_SHARED) | |
295 | mrunlock_shared(&ip->i_mmaplock); | |
296 | ||
fa96acad DC |
297 | if (lock_flags & XFS_ILOCK_EXCL) |
298 | mrunlock_excl(&ip->i_lock); | |
299 | else if (lock_flags & XFS_ILOCK_SHARED) | |
300 | mrunlock_shared(&ip->i_lock); | |
301 | ||
302 | trace_xfs_iunlock(ip, lock_flags, _RET_IP_); | |
303 | } | |
304 | ||
305 | /* | |
306 | * give up write locks. the i/o lock cannot be held nested | |
307 | * if it is being demoted. | |
308 | */ | |
309 | void | |
310 | xfs_ilock_demote( | |
311 | xfs_inode_t *ip, | |
312 | uint lock_flags) | |
313 | { | |
653c60b6 DC |
314 | ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_MMAPLOCK_EXCL|XFS_ILOCK_EXCL)); |
315 | ASSERT((lock_flags & | |
316 | ~(XFS_IOLOCK_EXCL|XFS_MMAPLOCK_EXCL|XFS_ILOCK_EXCL)) == 0); | |
fa96acad DC |
317 | |
318 | if (lock_flags & XFS_ILOCK_EXCL) | |
319 | mrdemote(&ip->i_lock); | |
653c60b6 DC |
320 | if (lock_flags & XFS_MMAPLOCK_EXCL) |
321 | mrdemote(&ip->i_mmaplock); | |
fa96acad DC |
322 | if (lock_flags & XFS_IOLOCK_EXCL) |
323 | mrdemote(&ip->i_iolock); | |
324 | ||
325 | trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_); | |
326 | } | |
327 | ||
742ae1e3 | 328 | #if defined(DEBUG) || defined(XFS_WARN) |
fa96acad DC |
329 | int |
330 | xfs_isilocked( | |
331 | xfs_inode_t *ip, | |
332 | uint lock_flags) | |
333 | { | |
334 | if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) { | |
335 | if (!(lock_flags & XFS_ILOCK_SHARED)) | |
336 | return !!ip->i_lock.mr_writer; | |
337 | return rwsem_is_locked(&ip->i_lock.mr_lock); | |
338 | } | |
339 | ||
653c60b6 DC |
340 | if (lock_flags & (XFS_MMAPLOCK_EXCL|XFS_MMAPLOCK_SHARED)) { |
341 | if (!(lock_flags & XFS_MMAPLOCK_SHARED)) | |
342 | return !!ip->i_mmaplock.mr_writer; | |
343 | return rwsem_is_locked(&ip->i_mmaplock.mr_lock); | |
344 | } | |
345 | ||
fa96acad DC |
346 | if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) { |
347 | if (!(lock_flags & XFS_IOLOCK_SHARED)) | |
348 | return !!ip->i_iolock.mr_writer; | |
349 | return rwsem_is_locked(&ip->i_iolock.mr_lock); | |
350 | } | |
351 | ||
352 | ASSERT(0); | |
353 | return 0; | |
354 | } | |
355 | #endif | |
356 | ||
c24b5dfa DC |
357 | #ifdef DEBUG |
358 | int xfs_locked_n; | |
359 | int xfs_small_retries; | |
360 | int xfs_middle_retries; | |
361 | int xfs_lots_retries; | |
362 | int xfs_lock_delays; | |
363 | #endif | |
364 | ||
365 | /* | |
653c60b6 DC |
366 | * Bump the subclass so xfs_lock_inodes() acquires each lock with a different |
367 | * value. This shouldn't be called for page fault locking, but we also need to | |
368 | * ensure we don't overrun the number of lockdep subclasses for the iolock or | |
369 | * mmaplock as that is limited to 12 by the mmap lock lockdep annotations. | |
c24b5dfa DC |
370 | */ |
371 | static inline int | |
372 | xfs_lock_inumorder(int lock_mode, int subclass) | |
373 | { | |
653c60b6 DC |
374 | if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) { |
375 | ASSERT(subclass + XFS_LOCK_INUMORDER < | |
376 | (1 << (XFS_MMAPLOCK_SHIFT - XFS_IOLOCK_SHIFT))); | |
c24b5dfa | 377 | lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT; |
653c60b6 DC |
378 | } |
379 | ||
380 | if (lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) { | |
381 | ASSERT(subclass + XFS_LOCK_INUMORDER < | |
382 | (1 << (XFS_ILOCK_SHIFT - XFS_MMAPLOCK_SHIFT))); | |
383 | lock_mode |= (subclass + XFS_LOCK_INUMORDER) << | |
384 | XFS_MMAPLOCK_SHIFT; | |
385 | } | |
386 | ||
c24b5dfa DC |
387 | if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) |
388 | lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT; | |
389 | ||
390 | return lock_mode; | |
391 | } | |
392 | ||
393 | /* | |
95afcf5c DC |
394 | * The following routine will lock n inodes in exclusive mode. We assume the |
395 | * caller calls us with the inodes in i_ino order. | |
c24b5dfa | 396 | * |
95afcf5c DC |
397 | * We need to detect deadlock where an inode that we lock is in the AIL and we |
398 | * start waiting for another inode that is locked by a thread in a long running | |
399 | * transaction (such as truncate). This can result in deadlock since the long | |
400 | * running trans might need to wait for the inode we just locked in order to | |
401 | * push the tail and free space in the log. | |
c24b5dfa DC |
402 | */ |
403 | void | |
404 | xfs_lock_inodes( | |
405 | xfs_inode_t **ips, | |
406 | int inodes, | |
407 | uint lock_mode) | |
408 | { | |
409 | int attempts = 0, i, j, try_lock; | |
410 | xfs_log_item_t *lp; | |
411 | ||
95afcf5c DC |
412 | /* currently supports between 2 and 5 inodes */ |
413 | ASSERT(ips && inodes >= 2 && inodes <= 5); | |
c24b5dfa DC |
414 | |
415 | try_lock = 0; | |
416 | i = 0; | |
c24b5dfa DC |
417 | again: |
418 | for (; i < inodes; i++) { | |
419 | ASSERT(ips[i]); | |
420 | ||
95afcf5c | 421 | if (i && (ips[i] == ips[i - 1])) /* Already locked */ |
c24b5dfa DC |
422 | continue; |
423 | ||
424 | /* | |
95afcf5c DC |
425 | * If try_lock is not set yet, make sure all locked inodes are |
426 | * not in the AIL. If any are, set try_lock to be used later. | |
c24b5dfa | 427 | */ |
c24b5dfa DC |
428 | if (!try_lock) { |
429 | for (j = (i - 1); j >= 0 && !try_lock; j--) { | |
430 | lp = (xfs_log_item_t *)ips[j]->i_itemp; | |
95afcf5c | 431 | if (lp && (lp->li_flags & XFS_LI_IN_AIL)) |
c24b5dfa | 432 | try_lock++; |
c24b5dfa DC |
433 | } |
434 | } | |
435 | ||
436 | /* | |
437 | * If any of the previous locks we have locked is in the AIL, | |
438 | * we must TRY to get the second and subsequent locks. If | |
439 | * we can't get any, we must release all we have | |
440 | * and try again. | |
441 | */ | |
95afcf5c DC |
442 | if (!try_lock) { |
443 | xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i)); | |
444 | continue; | |
445 | } | |
446 | ||
447 | /* try_lock means we have an inode locked that is in the AIL. */ | |
448 | ASSERT(i != 0); | |
449 | if (xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) | |
450 | continue; | |
c24b5dfa | 451 | |
95afcf5c DC |
452 | /* |
453 | * Unlock all previous guys and try again. xfs_iunlock will try | |
454 | * to push the tail if the inode is in the AIL. | |
455 | */ | |
456 | attempts++; | |
457 | for (j = i - 1; j >= 0; j--) { | |
c24b5dfa | 458 | /* |
95afcf5c DC |
459 | * Check to see if we've already unlocked this one. Not |
460 | * the first one going back, and the inode ptr is the | |
461 | * same. | |
c24b5dfa | 462 | */ |
95afcf5c DC |
463 | if (j != (i - 1) && ips[j] == ips[j + 1]) |
464 | continue; | |
c24b5dfa | 465 | |
95afcf5c DC |
466 | xfs_iunlock(ips[j], lock_mode); |
467 | } | |
c24b5dfa | 468 | |
95afcf5c DC |
469 | if ((attempts % 5) == 0) { |
470 | delay(1); /* Don't just spin the CPU */ | |
c24b5dfa | 471 | #ifdef DEBUG |
95afcf5c | 472 | xfs_lock_delays++; |
c24b5dfa | 473 | #endif |
c24b5dfa | 474 | } |
95afcf5c DC |
475 | i = 0; |
476 | try_lock = 0; | |
477 | goto again; | |
c24b5dfa DC |
478 | } |
479 | ||
480 | #ifdef DEBUG | |
481 | if (attempts) { | |
482 | if (attempts < 5) xfs_small_retries++; | |
483 | else if (attempts < 100) xfs_middle_retries++; | |
484 | else xfs_lots_retries++; | |
485 | } else { | |
486 | xfs_locked_n++; | |
487 | } | |
488 | #endif | |
489 | } | |
490 | ||
491 | /* | |
653c60b6 DC |
492 | * xfs_lock_two_inodes() can only be used to lock one type of lock at a time - |
493 | * the iolock, the mmaplock or the ilock, but not more than one at a time. If we | |
494 | * lock more than one at a time, lockdep will report false positives saying we | |
495 | * have violated locking orders. | |
c24b5dfa DC |
496 | */ |
497 | void | |
498 | xfs_lock_two_inodes( | |
499 | xfs_inode_t *ip0, | |
500 | xfs_inode_t *ip1, | |
501 | uint lock_mode) | |
502 | { | |
503 | xfs_inode_t *temp; | |
504 | int attempts = 0; | |
505 | xfs_log_item_t *lp; | |
506 | ||
653c60b6 DC |
507 | if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) { |
508 | ASSERT(!(lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL))); | |
509 | ASSERT(!(lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))); | |
510 | } else if (lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) | |
511 | ASSERT(!(lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))); | |
512 | ||
c24b5dfa DC |
513 | ASSERT(ip0->i_ino != ip1->i_ino); |
514 | ||
515 | if (ip0->i_ino > ip1->i_ino) { | |
516 | temp = ip0; | |
517 | ip0 = ip1; | |
518 | ip1 = temp; | |
519 | } | |
520 | ||
521 | again: | |
522 | xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0)); | |
523 | ||
524 | /* | |
525 | * If the first lock we have locked is in the AIL, we must TRY to get | |
526 | * the second lock. If we can't get it, we must release the first one | |
527 | * and try again. | |
528 | */ | |
529 | lp = (xfs_log_item_t *)ip0->i_itemp; | |
530 | if (lp && (lp->li_flags & XFS_LI_IN_AIL)) { | |
531 | if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) { | |
532 | xfs_iunlock(ip0, lock_mode); | |
533 | if ((++attempts % 5) == 0) | |
534 | delay(1); /* Don't just spin the CPU */ | |
535 | goto again; | |
536 | } | |
537 | } else { | |
538 | xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1)); | |
539 | } | |
540 | } | |
541 | ||
542 | ||
fa96acad DC |
543 | void |
544 | __xfs_iflock( | |
545 | struct xfs_inode *ip) | |
546 | { | |
547 | wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IFLOCK_BIT); | |
548 | DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IFLOCK_BIT); | |
549 | ||
550 | do { | |
551 | prepare_to_wait_exclusive(wq, &wait.wait, TASK_UNINTERRUPTIBLE); | |
552 | if (xfs_isiflocked(ip)) | |
553 | io_schedule(); | |
554 | } while (!xfs_iflock_nowait(ip)); | |
555 | ||
556 | finish_wait(wq, &wait.wait); | |
557 | } | |
558 | ||
1da177e4 LT |
559 | STATIC uint |
560 | _xfs_dic2xflags( | |
1da177e4 LT |
561 | __uint16_t di_flags) |
562 | { | |
563 | uint flags = 0; | |
564 | ||
565 | if (di_flags & XFS_DIFLAG_ANY) { | |
566 | if (di_flags & XFS_DIFLAG_REALTIME) | |
567 | flags |= XFS_XFLAG_REALTIME; | |
568 | if (di_flags & XFS_DIFLAG_PREALLOC) | |
569 | flags |= XFS_XFLAG_PREALLOC; | |
570 | if (di_flags & XFS_DIFLAG_IMMUTABLE) | |
571 | flags |= XFS_XFLAG_IMMUTABLE; | |
572 | if (di_flags & XFS_DIFLAG_APPEND) | |
573 | flags |= XFS_XFLAG_APPEND; | |
574 | if (di_flags & XFS_DIFLAG_SYNC) | |
575 | flags |= XFS_XFLAG_SYNC; | |
576 | if (di_flags & XFS_DIFLAG_NOATIME) | |
577 | flags |= XFS_XFLAG_NOATIME; | |
578 | if (di_flags & XFS_DIFLAG_NODUMP) | |
579 | flags |= XFS_XFLAG_NODUMP; | |
580 | if (di_flags & XFS_DIFLAG_RTINHERIT) | |
581 | flags |= XFS_XFLAG_RTINHERIT; | |
582 | if (di_flags & XFS_DIFLAG_PROJINHERIT) | |
583 | flags |= XFS_XFLAG_PROJINHERIT; | |
584 | if (di_flags & XFS_DIFLAG_NOSYMLINKS) | |
585 | flags |= XFS_XFLAG_NOSYMLINKS; | |
dd9f438e NS |
586 | if (di_flags & XFS_DIFLAG_EXTSIZE) |
587 | flags |= XFS_XFLAG_EXTSIZE; | |
588 | if (di_flags & XFS_DIFLAG_EXTSZINHERIT) | |
589 | flags |= XFS_XFLAG_EXTSZINHERIT; | |
d3446eac BN |
590 | if (di_flags & XFS_DIFLAG_NODEFRAG) |
591 | flags |= XFS_XFLAG_NODEFRAG; | |
2a82b8be DC |
592 | if (di_flags & XFS_DIFLAG_FILESTREAM) |
593 | flags |= XFS_XFLAG_FILESTREAM; | |
1da177e4 LT |
594 | } |
595 | ||
596 | return flags; | |
597 | } | |
598 | ||
599 | uint | |
600 | xfs_ip2xflags( | |
601 | xfs_inode_t *ip) | |
602 | { | |
347d1c01 | 603 | xfs_icdinode_t *dic = &ip->i_d; |
1da177e4 | 604 | |
a916e2bd | 605 | return _xfs_dic2xflags(dic->di_flags) | |
45ba598e | 606 | (XFS_IFORK_Q(ip) ? XFS_XFLAG_HASATTR : 0); |
1da177e4 LT |
607 | } |
608 | ||
609 | uint | |
610 | xfs_dic2xflags( | |
45ba598e | 611 | xfs_dinode_t *dip) |
1da177e4 | 612 | { |
81591fe2 | 613 | return _xfs_dic2xflags(be16_to_cpu(dip->di_flags)) | |
45ba598e | 614 | (XFS_DFORK_Q(dip) ? XFS_XFLAG_HASATTR : 0); |
1da177e4 LT |
615 | } |
616 | ||
c24b5dfa DC |
617 | /* |
618 | * Lookups up an inode from "name". If ci_name is not NULL, then a CI match | |
619 | * is allowed, otherwise it has to be an exact match. If a CI match is found, | |
620 | * ci_name->name will point to a the actual name (caller must free) or | |
621 | * will be set to NULL if an exact match is found. | |
622 | */ | |
623 | int | |
624 | xfs_lookup( | |
625 | xfs_inode_t *dp, | |
626 | struct xfs_name *name, | |
627 | xfs_inode_t **ipp, | |
628 | struct xfs_name *ci_name) | |
629 | { | |
630 | xfs_ino_t inum; | |
631 | int error; | |
632 | uint lock_mode; | |
633 | ||
634 | trace_xfs_lookup(dp, name); | |
635 | ||
636 | if (XFS_FORCED_SHUTDOWN(dp->i_mount)) | |
2451337d | 637 | return -EIO; |
c24b5dfa | 638 | |
309ecac8 | 639 | lock_mode = xfs_ilock_data_map_shared(dp); |
c24b5dfa | 640 | error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name); |
01f4f327 | 641 | xfs_iunlock(dp, lock_mode); |
c24b5dfa DC |
642 | |
643 | if (error) | |
644 | goto out; | |
645 | ||
646 | error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp); | |
647 | if (error) | |
648 | goto out_free_name; | |
649 | ||
650 | return 0; | |
651 | ||
652 | out_free_name: | |
653 | if (ci_name) | |
654 | kmem_free(ci_name->name); | |
655 | out: | |
656 | *ipp = NULL; | |
657 | return error; | |
658 | } | |
659 | ||
1da177e4 LT |
660 | /* |
661 | * Allocate an inode on disk and return a copy of its in-core version. | |
662 | * The in-core inode is locked exclusively. Set mode, nlink, and rdev | |
663 | * appropriately within the inode. The uid and gid for the inode are | |
664 | * set according to the contents of the given cred structure. | |
665 | * | |
666 | * Use xfs_dialloc() to allocate the on-disk inode. If xfs_dialloc() | |
cd856db6 CM |
667 | * has a free inode available, call xfs_iget() to obtain the in-core |
668 | * version of the allocated inode. Finally, fill in the inode and | |
669 | * log its initial contents. In this case, ialloc_context would be | |
670 | * set to NULL. | |
1da177e4 | 671 | * |
cd856db6 CM |
672 | * If xfs_dialloc() does not have an available inode, it will replenish |
673 | * its supply by doing an allocation. Since we can only do one | |
674 | * allocation within a transaction without deadlocks, we must commit | |
675 | * the current transaction before returning the inode itself. | |
676 | * In this case, therefore, we will set ialloc_context and return. | |
1da177e4 LT |
677 | * The caller should then commit the current transaction, start a new |
678 | * transaction, and call xfs_ialloc() again to actually get the inode. | |
679 | * | |
680 | * To ensure that some other process does not grab the inode that | |
681 | * was allocated during the first call to xfs_ialloc(), this routine | |
682 | * also returns the [locked] bp pointing to the head of the freelist | |
683 | * as ialloc_context. The caller should hold this buffer across | |
684 | * the commit and pass it back into this routine on the second call. | |
b11f94d5 DC |
685 | * |
686 | * If we are allocating quota inodes, we do not have a parent inode | |
687 | * to attach to or associate with (i.e. pip == NULL) because they | |
688 | * are not linked into the directory structure - they are attached | |
689 | * directly to the superblock - and so have no parent. | |
1da177e4 LT |
690 | */ |
691 | int | |
692 | xfs_ialloc( | |
693 | xfs_trans_t *tp, | |
694 | xfs_inode_t *pip, | |
576b1d67 | 695 | umode_t mode, |
31b084ae | 696 | xfs_nlink_t nlink, |
1da177e4 | 697 | xfs_dev_t rdev, |
6743099c | 698 | prid_t prid, |
1da177e4 LT |
699 | int okalloc, |
700 | xfs_buf_t **ialloc_context, | |
1da177e4 LT |
701 | xfs_inode_t **ipp) |
702 | { | |
93848a99 | 703 | struct xfs_mount *mp = tp->t_mountp; |
1da177e4 LT |
704 | xfs_ino_t ino; |
705 | xfs_inode_t *ip; | |
1da177e4 LT |
706 | uint flags; |
707 | int error; | |
e076b0f3 | 708 | struct timespec tv; |
1da177e4 LT |
709 | |
710 | /* | |
711 | * Call the space management code to pick | |
712 | * the on-disk inode to be allocated. | |
713 | */ | |
b11f94d5 | 714 | error = xfs_dialloc(tp, pip ? pip->i_ino : 0, mode, okalloc, |
08358906 | 715 | ialloc_context, &ino); |
bf904248 | 716 | if (error) |
1da177e4 | 717 | return error; |
08358906 | 718 | if (*ialloc_context || ino == NULLFSINO) { |
1da177e4 LT |
719 | *ipp = NULL; |
720 | return 0; | |
721 | } | |
722 | ASSERT(*ialloc_context == NULL); | |
723 | ||
724 | /* | |
725 | * Get the in-core inode with the lock held exclusively. | |
726 | * This is because we're setting fields here we need | |
727 | * to prevent others from looking at until we're done. | |
728 | */ | |
93848a99 | 729 | error = xfs_iget(mp, tp, ino, XFS_IGET_CREATE, |
ec3ba85f | 730 | XFS_ILOCK_EXCL, &ip); |
bf904248 | 731 | if (error) |
1da177e4 | 732 | return error; |
1da177e4 LT |
733 | ASSERT(ip != NULL); |
734 | ||
263997a6 DC |
735 | /* |
736 | * We always convert v1 inodes to v2 now - we only support filesystems | |
737 | * with >= v2 inode capability, so there is no reason for ever leaving | |
738 | * an inode in v1 format. | |
739 | */ | |
740 | if (ip->i_d.di_version == 1) | |
741 | ip->i_d.di_version = 2; | |
742 | ||
576b1d67 | 743 | ip->i_d.di_mode = mode; |
1da177e4 LT |
744 | ip->i_d.di_onlink = 0; |
745 | ip->i_d.di_nlink = nlink; | |
746 | ASSERT(ip->i_d.di_nlink == nlink); | |
7aab1b28 DE |
747 | ip->i_d.di_uid = xfs_kuid_to_uid(current_fsuid()); |
748 | ip->i_d.di_gid = xfs_kgid_to_gid(current_fsgid()); | |
6743099c | 749 | xfs_set_projid(ip, prid); |
1da177e4 LT |
750 | memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad)); |
751 | ||
bd186aa9 | 752 | if (pip && XFS_INHERIT_GID(pip)) { |
1da177e4 | 753 | ip->i_d.di_gid = pip->i_d.di_gid; |
abbede1b | 754 | if ((pip->i_d.di_mode & S_ISGID) && S_ISDIR(mode)) { |
1da177e4 LT |
755 | ip->i_d.di_mode |= S_ISGID; |
756 | } | |
757 | } | |
758 | ||
759 | /* | |
760 | * If the group ID of the new file does not match the effective group | |
761 | * ID or one of the supplementary group IDs, the S_ISGID bit is cleared | |
762 | * (and only if the irix_sgid_inherit compatibility variable is set). | |
763 | */ | |
764 | if ((irix_sgid_inherit) && | |
765 | (ip->i_d.di_mode & S_ISGID) && | |
7aab1b28 | 766 | (!in_group_p(xfs_gid_to_kgid(ip->i_d.di_gid)))) { |
1da177e4 LT |
767 | ip->i_d.di_mode &= ~S_ISGID; |
768 | } | |
769 | ||
770 | ip->i_d.di_size = 0; | |
771 | ip->i_d.di_nextents = 0; | |
772 | ASSERT(ip->i_d.di_nblocks == 0); | |
dff35fd4 | 773 | |
e076b0f3 | 774 | tv = current_fs_time(mp->m_super); |
dff35fd4 CH |
775 | ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec; |
776 | ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec; | |
777 | ip->i_d.di_atime = ip->i_d.di_mtime; | |
778 | ip->i_d.di_ctime = ip->i_d.di_mtime; | |
779 | ||
1da177e4 LT |
780 | /* |
781 | * di_gen will have been taken care of in xfs_iread. | |
782 | */ | |
783 | ip->i_d.di_extsize = 0; | |
784 | ip->i_d.di_dmevmask = 0; | |
785 | ip->i_d.di_dmstate = 0; | |
786 | ip->i_d.di_flags = 0; | |
93848a99 CH |
787 | |
788 | if (ip->i_d.di_version == 3) { | |
789 | ASSERT(ip->i_d.di_ino == ino); | |
790 | ASSERT(uuid_equal(&ip->i_d.di_uuid, &mp->m_sb.sb_uuid)); | |
791 | ip->i_d.di_crc = 0; | |
792 | ip->i_d.di_changecount = 1; | |
793 | ip->i_d.di_lsn = 0; | |
794 | ip->i_d.di_flags2 = 0; | |
795 | memset(&(ip->i_d.di_pad2[0]), 0, sizeof(ip->i_d.di_pad2)); | |
796 | ip->i_d.di_crtime = ip->i_d.di_mtime; | |
797 | } | |
798 | ||
799 | ||
1da177e4 LT |
800 | flags = XFS_ILOG_CORE; |
801 | switch (mode & S_IFMT) { | |
802 | case S_IFIFO: | |
803 | case S_IFCHR: | |
804 | case S_IFBLK: | |
805 | case S_IFSOCK: | |
806 | ip->i_d.di_format = XFS_DINODE_FMT_DEV; | |
807 | ip->i_df.if_u2.if_rdev = rdev; | |
808 | ip->i_df.if_flags = 0; | |
809 | flags |= XFS_ILOG_DEV; | |
810 | break; | |
811 | case S_IFREG: | |
812 | case S_IFDIR: | |
b11f94d5 | 813 | if (pip && (pip->i_d.di_flags & XFS_DIFLAG_ANY)) { |
365ca83d NS |
814 | uint di_flags = 0; |
815 | ||
abbede1b | 816 | if (S_ISDIR(mode)) { |
365ca83d NS |
817 | if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT) |
818 | di_flags |= XFS_DIFLAG_RTINHERIT; | |
dd9f438e NS |
819 | if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) { |
820 | di_flags |= XFS_DIFLAG_EXTSZINHERIT; | |
821 | ip->i_d.di_extsize = pip->i_d.di_extsize; | |
822 | } | |
9336e3a7 DC |
823 | if (pip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) |
824 | di_flags |= XFS_DIFLAG_PROJINHERIT; | |
abbede1b | 825 | } else if (S_ISREG(mode)) { |
613d7043 | 826 | if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT) |
365ca83d | 827 | di_flags |= XFS_DIFLAG_REALTIME; |
dd9f438e NS |
828 | if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) { |
829 | di_flags |= XFS_DIFLAG_EXTSIZE; | |
830 | ip->i_d.di_extsize = pip->i_d.di_extsize; | |
831 | } | |
1da177e4 LT |
832 | } |
833 | if ((pip->i_d.di_flags & XFS_DIFLAG_NOATIME) && | |
834 | xfs_inherit_noatime) | |
365ca83d | 835 | di_flags |= XFS_DIFLAG_NOATIME; |
1da177e4 LT |
836 | if ((pip->i_d.di_flags & XFS_DIFLAG_NODUMP) && |
837 | xfs_inherit_nodump) | |
365ca83d | 838 | di_flags |= XFS_DIFLAG_NODUMP; |
1da177e4 LT |
839 | if ((pip->i_d.di_flags & XFS_DIFLAG_SYNC) && |
840 | xfs_inherit_sync) | |
365ca83d | 841 | di_flags |= XFS_DIFLAG_SYNC; |
1da177e4 LT |
842 | if ((pip->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) && |
843 | xfs_inherit_nosymlinks) | |
365ca83d | 844 | di_flags |= XFS_DIFLAG_NOSYMLINKS; |
d3446eac BN |
845 | if ((pip->i_d.di_flags & XFS_DIFLAG_NODEFRAG) && |
846 | xfs_inherit_nodefrag) | |
847 | di_flags |= XFS_DIFLAG_NODEFRAG; | |
2a82b8be DC |
848 | if (pip->i_d.di_flags & XFS_DIFLAG_FILESTREAM) |
849 | di_flags |= XFS_DIFLAG_FILESTREAM; | |
365ca83d | 850 | ip->i_d.di_flags |= di_flags; |
1da177e4 LT |
851 | } |
852 | /* FALLTHROUGH */ | |
853 | case S_IFLNK: | |
854 | ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS; | |
855 | ip->i_df.if_flags = XFS_IFEXTENTS; | |
856 | ip->i_df.if_bytes = ip->i_df.if_real_bytes = 0; | |
857 | ip->i_df.if_u1.if_extents = NULL; | |
858 | break; | |
859 | default: | |
860 | ASSERT(0); | |
861 | } | |
862 | /* | |
863 | * Attribute fork settings for new inode. | |
864 | */ | |
865 | ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS; | |
866 | ip->i_d.di_anextents = 0; | |
867 | ||
868 | /* | |
869 | * Log the new values stuffed into the inode. | |
870 | */ | |
ddc3415a | 871 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); |
1da177e4 LT |
872 | xfs_trans_log_inode(tp, ip, flags); |
873 | ||
58c90473 | 874 | /* now that we have an i_mode we can setup the inode structure */ |
41be8bed | 875 | xfs_setup_inode(ip); |
1da177e4 LT |
876 | |
877 | *ipp = ip; | |
878 | return 0; | |
879 | } | |
880 | ||
e546cb79 DC |
881 | /* |
882 | * Allocates a new inode from disk and return a pointer to the | |
883 | * incore copy. This routine will internally commit the current | |
884 | * transaction and allocate a new one if the Space Manager needed | |
885 | * to do an allocation to replenish the inode free-list. | |
886 | * | |
887 | * This routine is designed to be called from xfs_create and | |
888 | * xfs_create_dir. | |
889 | * | |
890 | */ | |
891 | int | |
892 | xfs_dir_ialloc( | |
893 | xfs_trans_t **tpp, /* input: current transaction; | |
894 | output: may be a new transaction. */ | |
895 | xfs_inode_t *dp, /* directory within whose allocate | |
896 | the inode. */ | |
897 | umode_t mode, | |
898 | xfs_nlink_t nlink, | |
899 | xfs_dev_t rdev, | |
900 | prid_t prid, /* project id */ | |
901 | int okalloc, /* ok to allocate new space */ | |
902 | xfs_inode_t **ipp, /* pointer to inode; it will be | |
903 | locked. */ | |
904 | int *committed) | |
905 | ||
906 | { | |
907 | xfs_trans_t *tp; | |
e546cb79 DC |
908 | xfs_inode_t *ip; |
909 | xfs_buf_t *ialloc_context = NULL; | |
910 | int code; | |
e546cb79 DC |
911 | void *dqinfo; |
912 | uint tflags; | |
913 | ||
914 | tp = *tpp; | |
915 | ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); | |
916 | ||
917 | /* | |
918 | * xfs_ialloc will return a pointer to an incore inode if | |
919 | * the Space Manager has an available inode on the free | |
920 | * list. Otherwise, it will do an allocation and replenish | |
921 | * the freelist. Since we can only do one allocation per | |
922 | * transaction without deadlocks, we will need to commit the | |
923 | * current transaction and start a new one. We will then | |
924 | * need to call xfs_ialloc again to get the inode. | |
925 | * | |
926 | * If xfs_ialloc did an allocation to replenish the freelist, | |
927 | * it returns the bp containing the head of the freelist as | |
928 | * ialloc_context. We will hold a lock on it across the | |
929 | * transaction commit so that no other process can steal | |
930 | * the inode(s) that we've just allocated. | |
931 | */ | |
932 | code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid, okalloc, | |
933 | &ialloc_context, &ip); | |
934 | ||
935 | /* | |
936 | * Return an error if we were unable to allocate a new inode. | |
937 | * This should only happen if we run out of space on disk or | |
938 | * encounter a disk error. | |
939 | */ | |
940 | if (code) { | |
941 | *ipp = NULL; | |
942 | return code; | |
943 | } | |
944 | if (!ialloc_context && !ip) { | |
945 | *ipp = NULL; | |
2451337d | 946 | return -ENOSPC; |
e546cb79 DC |
947 | } |
948 | ||
949 | /* | |
950 | * If the AGI buffer is non-NULL, then we were unable to get an | |
951 | * inode in one operation. We need to commit the current | |
952 | * transaction and call xfs_ialloc() again. It is guaranteed | |
953 | * to succeed the second time. | |
954 | */ | |
955 | if (ialloc_context) { | |
956 | /* | |
957 | * Normally, xfs_trans_commit releases all the locks. | |
958 | * We call bhold to hang on to the ialloc_context across | |
959 | * the commit. Holding this buffer prevents any other | |
960 | * processes from doing any allocations in this | |
961 | * allocation group. | |
962 | */ | |
963 | xfs_trans_bhold(tp, ialloc_context); | |
e546cb79 DC |
964 | |
965 | /* | |
966 | * We want the quota changes to be associated with the next | |
967 | * transaction, NOT this one. So, detach the dqinfo from this | |
968 | * and attach it to the next transaction. | |
969 | */ | |
970 | dqinfo = NULL; | |
971 | tflags = 0; | |
972 | if (tp->t_dqinfo) { | |
973 | dqinfo = (void *)tp->t_dqinfo; | |
974 | tp->t_dqinfo = NULL; | |
975 | tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY; | |
976 | tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY); | |
977 | } | |
978 | ||
2e6db6c4 CH |
979 | code = xfs_trans_roll(&tp, 0); |
980 | if (committed != NULL) | |
e546cb79 | 981 | *committed = 1; |
3d3c8b52 | 982 | |
e546cb79 DC |
983 | /* |
984 | * Re-attach the quota info that we detached from prev trx. | |
985 | */ | |
986 | if (dqinfo) { | |
987 | tp->t_dqinfo = dqinfo; | |
988 | tp->t_flags |= tflags; | |
989 | } | |
990 | ||
991 | if (code) { | |
992 | xfs_buf_relse(ialloc_context); | |
2e6db6c4 | 993 | *tpp = tp; |
e546cb79 DC |
994 | *ipp = NULL; |
995 | return code; | |
996 | } | |
997 | xfs_trans_bjoin(tp, ialloc_context); | |
998 | ||
999 | /* | |
1000 | * Call ialloc again. Since we've locked out all | |
1001 | * other allocations in this allocation group, | |
1002 | * this call should always succeed. | |
1003 | */ | |
1004 | code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid, | |
1005 | okalloc, &ialloc_context, &ip); | |
1006 | ||
1007 | /* | |
1008 | * If we get an error at this point, return to the caller | |
1009 | * so that the current transaction can be aborted. | |
1010 | */ | |
1011 | if (code) { | |
1012 | *tpp = tp; | |
1013 | *ipp = NULL; | |
1014 | return code; | |
1015 | } | |
1016 | ASSERT(!ialloc_context && ip); | |
1017 | ||
1018 | } else { | |
1019 | if (committed != NULL) | |
1020 | *committed = 0; | |
1021 | } | |
1022 | ||
1023 | *ipp = ip; | |
1024 | *tpp = tp; | |
1025 | ||
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * Decrement the link count on an inode & log the change. | |
1031 | * If this causes the link count to go to zero, initiate the | |
1032 | * logging activity required to truncate a file. | |
1033 | */ | |
1034 | int /* error */ | |
1035 | xfs_droplink( | |
1036 | xfs_trans_t *tp, | |
1037 | xfs_inode_t *ip) | |
1038 | { | |
1039 | int error; | |
1040 | ||
1041 | xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG); | |
1042 | ||
1043 | ASSERT (ip->i_d.di_nlink > 0); | |
1044 | ip->i_d.di_nlink--; | |
1045 | drop_nlink(VFS_I(ip)); | |
1046 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
1047 | ||
1048 | error = 0; | |
1049 | if (ip->i_d.di_nlink == 0) { | |
1050 | /* | |
1051 | * We're dropping the last link to this file. | |
1052 | * Move the on-disk inode to the AGI unlinked list. | |
1053 | * From xfs_inactive() we will pull the inode from | |
1054 | * the list and free it. | |
1055 | */ | |
1056 | error = xfs_iunlink(tp, ip); | |
1057 | } | |
1058 | return error; | |
1059 | } | |
1060 | ||
e546cb79 DC |
1061 | /* |
1062 | * Increment the link count on an inode & log the change. | |
1063 | */ | |
1064 | int | |
1065 | xfs_bumplink( | |
1066 | xfs_trans_t *tp, | |
1067 | xfs_inode_t *ip) | |
1068 | { | |
1069 | xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG); | |
1070 | ||
263997a6 | 1071 | ASSERT(ip->i_d.di_version > 1); |
ab297431 | 1072 | ASSERT(ip->i_d.di_nlink > 0 || (VFS_I(ip)->i_state & I_LINKABLE)); |
e546cb79 DC |
1073 | ip->i_d.di_nlink++; |
1074 | inc_nlink(VFS_I(ip)); | |
e546cb79 DC |
1075 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
1076 | return 0; | |
1077 | } | |
1078 | ||
c24b5dfa DC |
1079 | int |
1080 | xfs_create( | |
1081 | xfs_inode_t *dp, | |
1082 | struct xfs_name *name, | |
1083 | umode_t mode, | |
1084 | xfs_dev_t rdev, | |
1085 | xfs_inode_t **ipp) | |
1086 | { | |
1087 | int is_dir = S_ISDIR(mode); | |
1088 | struct xfs_mount *mp = dp->i_mount; | |
1089 | struct xfs_inode *ip = NULL; | |
1090 | struct xfs_trans *tp = NULL; | |
1091 | int error; | |
1092 | xfs_bmap_free_t free_list; | |
1093 | xfs_fsblock_t first_block; | |
1094 | bool unlock_dp_on_error = false; | |
c24b5dfa DC |
1095 | int committed; |
1096 | prid_t prid; | |
1097 | struct xfs_dquot *udqp = NULL; | |
1098 | struct xfs_dquot *gdqp = NULL; | |
1099 | struct xfs_dquot *pdqp = NULL; | |
062647a8 | 1100 | struct xfs_trans_res *tres; |
c24b5dfa | 1101 | uint resblks; |
c24b5dfa DC |
1102 | |
1103 | trace_xfs_create(dp, name); | |
1104 | ||
1105 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2451337d | 1106 | return -EIO; |
c24b5dfa | 1107 | |
163467d3 | 1108 | prid = xfs_get_initial_prid(dp); |
c24b5dfa DC |
1109 | |
1110 | /* | |
1111 | * Make sure that we have allocated dquot(s) on disk. | |
1112 | */ | |
7aab1b28 DE |
1113 | error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()), |
1114 | xfs_kgid_to_gid(current_fsgid()), prid, | |
c24b5dfa DC |
1115 | XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, |
1116 | &udqp, &gdqp, &pdqp); | |
1117 | if (error) | |
1118 | return error; | |
1119 | ||
1120 | if (is_dir) { | |
1121 | rdev = 0; | |
1122 | resblks = XFS_MKDIR_SPACE_RES(mp, name->len); | |
062647a8 | 1123 | tres = &M_RES(mp)->tr_mkdir; |
c24b5dfa DC |
1124 | tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR); |
1125 | } else { | |
1126 | resblks = XFS_CREATE_SPACE_RES(mp, name->len); | |
062647a8 | 1127 | tres = &M_RES(mp)->tr_create; |
c24b5dfa DC |
1128 | tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE); |
1129 | } | |
1130 | ||
c24b5dfa DC |
1131 | /* |
1132 | * Initially assume that the file does not exist and | |
1133 | * reserve the resources for that case. If that is not | |
1134 | * the case we'll drop the one we have and get a more | |
1135 | * appropriate transaction later. | |
1136 | */ | |
062647a8 | 1137 | error = xfs_trans_reserve(tp, tres, resblks, 0); |
2451337d | 1138 | if (error == -ENOSPC) { |
c24b5dfa DC |
1139 | /* flush outstanding delalloc blocks and retry */ |
1140 | xfs_flush_inodes(mp); | |
062647a8 | 1141 | error = xfs_trans_reserve(tp, tres, resblks, 0); |
c24b5dfa | 1142 | } |
2451337d | 1143 | if (error == -ENOSPC) { |
c24b5dfa DC |
1144 | /* No space at all so try a "no-allocation" reservation */ |
1145 | resblks = 0; | |
062647a8 | 1146 | error = xfs_trans_reserve(tp, tres, 0, 0); |
c24b5dfa | 1147 | } |
4906e215 | 1148 | if (error) |
c24b5dfa | 1149 | goto out_trans_cancel; |
4906e215 | 1150 | |
c24b5dfa DC |
1151 | |
1152 | xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT); | |
1153 | unlock_dp_on_error = true; | |
1154 | ||
1155 | xfs_bmap_init(&free_list, &first_block); | |
1156 | ||
1157 | /* | |
1158 | * Reserve disk quota and the inode. | |
1159 | */ | |
1160 | error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, | |
1161 | pdqp, resblks, 1, 0); | |
1162 | if (error) | |
1163 | goto out_trans_cancel; | |
1164 | ||
94f3cad5 ES |
1165 | if (!resblks) { |
1166 | error = xfs_dir_canenter(tp, dp, name); | |
1167 | if (error) | |
1168 | goto out_trans_cancel; | |
1169 | } | |
c24b5dfa DC |
1170 | |
1171 | /* | |
1172 | * A newly created regular or special file just has one directory | |
1173 | * entry pointing to them, but a directory also the "." entry | |
1174 | * pointing to itself. | |
1175 | */ | |
1176 | error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev, | |
1177 | prid, resblks > 0, &ip, &committed); | |
1178 | if (error) { | |
2451337d | 1179 | if (error == -ENOSPC) |
c24b5dfa | 1180 | goto out_trans_cancel; |
4906e215 | 1181 | goto out_trans_cancel; |
c24b5dfa DC |
1182 | } |
1183 | ||
1184 | /* | |
1185 | * Now we join the directory inode to the transaction. We do not do it | |
1186 | * earlier because xfs_dir_ialloc might commit the previous transaction | |
1187 | * (and release all the locks). An error from here on will result in | |
1188 | * the transaction cancel unlocking dp so don't do it explicitly in the | |
1189 | * error path. | |
1190 | */ | |
1191 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
1192 | unlock_dp_on_error = false; | |
1193 | ||
1194 | error = xfs_dir_createname(tp, dp, name, ip->i_ino, | |
1195 | &first_block, &free_list, resblks ? | |
1196 | resblks - XFS_IALLOC_SPACE_RES(mp) : 0); | |
1197 | if (error) { | |
2451337d | 1198 | ASSERT(error != -ENOSPC); |
4906e215 | 1199 | goto out_trans_cancel; |
c24b5dfa DC |
1200 | } |
1201 | xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
1202 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
1203 | ||
1204 | if (is_dir) { | |
1205 | error = xfs_dir_init(tp, ip, dp); | |
1206 | if (error) | |
1207 | goto out_bmap_cancel; | |
1208 | ||
1209 | error = xfs_bumplink(tp, dp); | |
1210 | if (error) | |
1211 | goto out_bmap_cancel; | |
1212 | } | |
1213 | ||
1214 | /* | |
1215 | * If this is a synchronous mount, make sure that the | |
1216 | * create transaction goes to disk before returning to | |
1217 | * the user. | |
1218 | */ | |
1219 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) | |
1220 | xfs_trans_set_sync(tp); | |
1221 | ||
1222 | /* | |
1223 | * Attach the dquot(s) to the inodes and modify them incore. | |
1224 | * These ids of the inode couldn't have changed since the new | |
1225 | * inode has been locked ever since it was created. | |
1226 | */ | |
1227 | xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp); | |
1228 | ||
1229 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
1230 | if (error) | |
1231 | goto out_bmap_cancel; | |
1232 | ||
70393313 | 1233 | error = xfs_trans_commit(tp); |
c24b5dfa DC |
1234 | if (error) |
1235 | goto out_release_inode; | |
1236 | ||
1237 | xfs_qm_dqrele(udqp); | |
1238 | xfs_qm_dqrele(gdqp); | |
1239 | xfs_qm_dqrele(pdqp); | |
1240 | ||
1241 | *ipp = ip; | |
1242 | return 0; | |
1243 | ||
1244 | out_bmap_cancel: | |
1245 | xfs_bmap_cancel(&free_list); | |
c24b5dfa | 1246 | out_trans_cancel: |
4906e215 | 1247 | xfs_trans_cancel(tp); |
c24b5dfa DC |
1248 | out_release_inode: |
1249 | /* | |
58c90473 DC |
1250 | * Wait until after the current transaction is aborted to finish the |
1251 | * setup of the inode and release the inode. This prevents recursive | |
1252 | * transactions and deadlocks from xfs_inactive. | |
c24b5dfa | 1253 | */ |
58c90473 DC |
1254 | if (ip) { |
1255 | xfs_finish_inode_setup(ip); | |
c24b5dfa | 1256 | IRELE(ip); |
58c90473 | 1257 | } |
c24b5dfa DC |
1258 | |
1259 | xfs_qm_dqrele(udqp); | |
1260 | xfs_qm_dqrele(gdqp); | |
1261 | xfs_qm_dqrele(pdqp); | |
1262 | ||
1263 | if (unlock_dp_on_error) | |
1264 | xfs_iunlock(dp, XFS_ILOCK_EXCL); | |
1265 | return error; | |
1266 | } | |
1267 | ||
99b6436b ZYW |
1268 | int |
1269 | xfs_create_tmpfile( | |
1270 | struct xfs_inode *dp, | |
1271 | struct dentry *dentry, | |
330033d6 BF |
1272 | umode_t mode, |
1273 | struct xfs_inode **ipp) | |
99b6436b ZYW |
1274 | { |
1275 | struct xfs_mount *mp = dp->i_mount; | |
1276 | struct xfs_inode *ip = NULL; | |
1277 | struct xfs_trans *tp = NULL; | |
1278 | int error; | |
99b6436b ZYW |
1279 | prid_t prid; |
1280 | struct xfs_dquot *udqp = NULL; | |
1281 | struct xfs_dquot *gdqp = NULL; | |
1282 | struct xfs_dquot *pdqp = NULL; | |
1283 | struct xfs_trans_res *tres; | |
1284 | uint resblks; | |
1285 | ||
1286 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2451337d | 1287 | return -EIO; |
99b6436b ZYW |
1288 | |
1289 | prid = xfs_get_initial_prid(dp); | |
1290 | ||
1291 | /* | |
1292 | * Make sure that we have allocated dquot(s) on disk. | |
1293 | */ | |
1294 | error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()), | |
1295 | xfs_kgid_to_gid(current_fsgid()), prid, | |
1296 | XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, | |
1297 | &udqp, &gdqp, &pdqp); | |
1298 | if (error) | |
1299 | return error; | |
1300 | ||
1301 | resblks = XFS_IALLOC_SPACE_RES(mp); | |
1302 | tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE_TMPFILE); | |
1303 | ||
1304 | tres = &M_RES(mp)->tr_create_tmpfile; | |
1305 | error = xfs_trans_reserve(tp, tres, resblks, 0); | |
2451337d | 1306 | if (error == -ENOSPC) { |
99b6436b ZYW |
1307 | /* No space at all so try a "no-allocation" reservation */ |
1308 | resblks = 0; | |
1309 | error = xfs_trans_reserve(tp, tres, 0, 0); | |
1310 | } | |
4906e215 | 1311 | if (error) |
99b6436b | 1312 | goto out_trans_cancel; |
99b6436b ZYW |
1313 | |
1314 | error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, | |
1315 | pdqp, resblks, 1, 0); | |
1316 | if (error) | |
1317 | goto out_trans_cancel; | |
1318 | ||
1319 | error = xfs_dir_ialloc(&tp, dp, mode, 1, 0, | |
1320 | prid, resblks > 0, &ip, NULL); | |
1321 | if (error) { | |
2451337d | 1322 | if (error == -ENOSPC) |
99b6436b | 1323 | goto out_trans_cancel; |
4906e215 | 1324 | goto out_trans_cancel; |
99b6436b ZYW |
1325 | } |
1326 | ||
1327 | if (mp->m_flags & XFS_MOUNT_WSYNC) | |
1328 | xfs_trans_set_sync(tp); | |
1329 | ||
1330 | /* | |
1331 | * Attach the dquot(s) to the inodes and modify them incore. | |
1332 | * These ids of the inode couldn't have changed since the new | |
1333 | * inode has been locked ever since it was created. | |
1334 | */ | |
1335 | xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp); | |
1336 | ||
1337 | ip->i_d.di_nlink--; | |
99b6436b ZYW |
1338 | error = xfs_iunlink(tp, ip); |
1339 | if (error) | |
4906e215 | 1340 | goto out_trans_cancel; |
99b6436b | 1341 | |
70393313 | 1342 | error = xfs_trans_commit(tp); |
99b6436b ZYW |
1343 | if (error) |
1344 | goto out_release_inode; | |
1345 | ||
1346 | xfs_qm_dqrele(udqp); | |
1347 | xfs_qm_dqrele(gdqp); | |
1348 | xfs_qm_dqrele(pdqp); | |
1349 | ||
330033d6 | 1350 | *ipp = ip; |
99b6436b ZYW |
1351 | return 0; |
1352 | ||
99b6436b | 1353 | out_trans_cancel: |
4906e215 | 1354 | xfs_trans_cancel(tp); |
99b6436b ZYW |
1355 | out_release_inode: |
1356 | /* | |
58c90473 DC |
1357 | * Wait until after the current transaction is aborted to finish the |
1358 | * setup of the inode and release the inode. This prevents recursive | |
1359 | * transactions and deadlocks from xfs_inactive. | |
99b6436b | 1360 | */ |
58c90473 DC |
1361 | if (ip) { |
1362 | xfs_finish_inode_setup(ip); | |
99b6436b | 1363 | IRELE(ip); |
58c90473 | 1364 | } |
99b6436b ZYW |
1365 | |
1366 | xfs_qm_dqrele(udqp); | |
1367 | xfs_qm_dqrele(gdqp); | |
1368 | xfs_qm_dqrele(pdqp); | |
1369 | ||
1370 | return error; | |
1371 | } | |
1372 | ||
c24b5dfa DC |
1373 | int |
1374 | xfs_link( | |
1375 | xfs_inode_t *tdp, | |
1376 | xfs_inode_t *sip, | |
1377 | struct xfs_name *target_name) | |
1378 | { | |
1379 | xfs_mount_t *mp = tdp->i_mount; | |
1380 | xfs_trans_t *tp; | |
1381 | int error; | |
1382 | xfs_bmap_free_t free_list; | |
1383 | xfs_fsblock_t first_block; | |
c24b5dfa DC |
1384 | int committed; |
1385 | int resblks; | |
1386 | ||
1387 | trace_xfs_link(tdp, target_name); | |
1388 | ||
1389 | ASSERT(!S_ISDIR(sip->i_d.di_mode)); | |
1390 | ||
1391 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2451337d | 1392 | return -EIO; |
c24b5dfa DC |
1393 | |
1394 | error = xfs_qm_dqattach(sip, 0); | |
1395 | if (error) | |
1396 | goto std_return; | |
1397 | ||
1398 | error = xfs_qm_dqattach(tdp, 0); | |
1399 | if (error) | |
1400 | goto std_return; | |
1401 | ||
1402 | tp = xfs_trans_alloc(mp, XFS_TRANS_LINK); | |
c24b5dfa | 1403 | resblks = XFS_LINK_SPACE_RES(mp, target_name->len); |
3d3c8b52 | 1404 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_link, resblks, 0); |
2451337d | 1405 | if (error == -ENOSPC) { |
c24b5dfa | 1406 | resblks = 0; |
3d3c8b52 | 1407 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_link, 0, 0); |
c24b5dfa | 1408 | } |
4906e215 | 1409 | if (error) |
c24b5dfa | 1410 | goto error_return; |
c24b5dfa DC |
1411 | |
1412 | xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL); | |
1413 | ||
1414 | xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL); | |
1415 | xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL); | |
1416 | ||
1417 | /* | |
1418 | * If we are using project inheritance, we only allow hard link | |
1419 | * creation in our tree when the project IDs are the same; else | |
1420 | * the tree quota mechanism could be circumvented. | |
1421 | */ | |
1422 | if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && | |
1423 | (xfs_get_projid(tdp) != xfs_get_projid(sip)))) { | |
2451337d | 1424 | error = -EXDEV; |
c24b5dfa DC |
1425 | goto error_return; |
1426 | } | |
1427 | ||
94f3cad5 ES |
1428 | if (!resblks) { |
1429 | error = xfs_dir_canenter(tp, tdp, target_name); | |
1430 | if (error) | |
1431 | goto error_return; | |
1432 | } | |
c24b5dfa DC |
1433 | |
1434 | xfs_bmap_init(&free_list, &first_block); | |
1435 | ||
ab297431 ZYW |
1436 | if (sip->i_d.di_nlink == 0) { |
1437 | error = xfs_iunlink_remove(tp, sip); | |
1438 | if (error) | |
4906e215 | 1439 | goto error_return; |
ab297431 ZYW |
1440 | } |
1441 | ||
c24b5dfa DC |
1442 | error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino, |
1443 | &first_block, &free_list, resblks); | |
1444 | if (error) | |
4906e215 | 1445 | goto error_return; |
c24b5dfa DC |
1446 | xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
1447 | xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE); | |
1448 | ||
1449 | error = xfs_bumplink(tp, sip); | |
1450 | if (error) | |
4906e215 | 1451 | goto error_return; |
c24b5dfa DC |
1452 | |
1453 | /* | |
1454 | * If this is a synchronous mount, make sure that the | |
1455 | * link transaction goes to disk before returning to | |
1456 | * the user. | |
1457 | */ | |
1458 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
1459 | xfs_trans_set_sync(tp); | |
1460 | } | |
1461 | ||
1462 | error = xfs_bmap_finish (&tp, &free_list, &committed); | |
1463 | if (error) { | |
1464 | xfs_bmap_cancel(&free_list); | |
4906e215 | 1465 | goto error_return; |
c24b5dfa DC |
1466 | } |
1467 | ||
70393313 | 1468 | return xfs_trans_commit(tp); |
c24b5dfa | 1469 | |
c24b5dfa | 1470 | error_return: |
4906e215 | 1471 | xfs_trans_cancel(tp); |
c24b5dfa DC |
1472 | std_return: |
1473 | return error; | |
1474 | } | |
1475 | ||
1da177e4 | 1476 | /* |
8f04c47a CH |
1477 | * Free up the underlying blocks past new_size. The new size must be smaller |
1478 | * than the current size. This routine can be used both for the attribute and | |
1479 | * data fork, and does not modify the inode size, which is left to the caller. | |
1da177e4 | 1480 | * |
f6485057 DC |
1481 | * The transaction passed to this routine must have made a permanent log |
1482 | * reservation of at least XFS_ITRUNCATE_LOG_RES. This routine may commit the | |
1483 | * given transaction and start new ones, so make sure everything involved in | |
1484 | * the transaction is tidy before calling here. Some transaction will be | |
1485 | * returned to the caller to be committed. The incoming transaction must | |
1486 | * already include the inode, and both inode locks must be held exclusively. | |
1487 | * The inode must also be "held" within the transaction. On return the inode | |
1488 | * will be "held" within the returned transaction. This routine does NOT | |
1489 | * require any disk space to be reserved for it within the transaction. | |
1da177e4 | 1490 | * |
f6485057 DC |
1491 | * If we get an error, we must return with the inode locked and linked into the |
1492 | * current transaction. This keeps things simple for the higher level code, | |
1493 | * because it always knows that the inode is locked and held in the transaction | |
1494 | * that returns to it whether errors occur or not. We don't mark the inode | |
1495 | * dirty on error so that transactions can be easily aborted if possible. | |
1da177e4 LT |
1496 | */ |
1497 | int | |
8f04c47a CH |
1498 | xfs_itruncate_extents( |
1499 | struct xfs_trans **tpp, | |
1500 | struct xfs_inode *ip, | |
1501 | int whichfork, | |
1502 | xfs_fsize_t new_size) | |
1da177e4 | 1503 | { |
8f04c47a CH |
1504 | struct xfs_mount *mp = ip->i_mount; |
1505 | struct xfs_trans *tp = *tpp; | |
8f04c47a CH |
1506 | xfs_bmap_free_t free_list; |
1507 | xfs_fsblock_t first_block; | |
1508 | xfs_fileoff_t first_unmap_block; | |
1509 | xfs_fileoff_t last_block; | |
1510 | xfs_filblks_t unmap_len; | |
1511 | int committed; | |
1512 | int error = 0; | |
1513 | int done = 0; | |
1da177e4 | 1514 | |
0b56185b CH |
1515 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
1516 | ASSERT(!atomic_read(&VFS_I(ip)->i_count) || | |
1517 | xfs_isilocked(ip, XFS_IOLOCK_EXCL)); | |
ce7ae151 | 1518 | ASSERT(new_size <= XFS_ISIZE(ip)); |
8f04c47a | 1519 | ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); |
1da177e4 | 1520 | ASSERT(ip->i_itemp != NULL); |
898621d5 | 1521 | ASSERT(ip->i_itemp->ili_lock_flags == 0); |
8f04c47a | 1522 | ASSERT(!XFS_NOT_DQATTACHED(mp, ip)); |
1da177e4 | 1523 | |
673e8e59 CH |
1524 | trace_xfs_itruncate_extents_start(ip, new_size); |
1525 | ||
1da177e4 LT |
1526 | /* |
1527 | * Since it is possible for space to become allocated beyond | |
1528 | * the end of the file (in a crash where the space is allocated | |
1529 | * but the inode size is not yet updated), simply remove any | |
1530 | * blocks which show up between the new EOF and the maximum | |
1531 | * possible file size. If the first block to be removed is | |
1532 | * beyond the maximum file size (ie it is the same as last_block), | |
1533 | * then there is nothing to do. | |
1534 | */ | |
8f04c47a | 1535 | first_unmap_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size); |
32972383 | 1536 | last_block = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); |
8f04c47a CH |
1537 | if (first_unmap_block == last_block) |
1538 | return 0; | |
1539 | ||
1540 | ASSERT(first_unmap_block < last_block); | |
1541 | unmap_len = last_block - first_unmap_block + 1; | |
1da177e4 | 1542 | while (!done) { |
9d87c319 | 1543 | xfs_bmap_init(&free_list, &first_block); |
8f04c47a | 1544 | error = xfs_bunmapi(tp, ip, |
3e57ecf6 | 1545 | first_unmap_block, unmap_len, |
8f04c47a | 1546 | xfs_bmapi_aflag(whichfork), |
1da177e4 | 1547 | XFS_ITRUNC_MAX_EXTENTS, |
3e57ecf6 | 1548 | &first_block, &free_list, |
b4e9181e | 1549 | &done); |
8f04c47a CH |
1550 | if (error) |
1551 | goto out_bmap_cancel; | |
1da177e4 LT |
1552 | |
1553 | /* | |
1554 | * Duplicate the transaction that has the permanent | |
1555 | * reservation and commit the old transaction. | |
1556 | */ | |
8f04c47a | 1557 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
898621d5 | 1558 | if (committed) |
ddc3415a | 1559 | xfs_trans_ijoin(tp, ip, 0); |
8f04c47a CH |
1560 | if (error) |
1561 | goto out_bmap_cancel; | |
1da177e4 | 1562 | |
2e6db6c4 | 1563 | error = xfs_trans_roll(&tp, ip); |
f6485057 | 1564 | if (error) |
8f04c47a | 1565 | goto out; |
1da177e4 | 1566 | } |
8f04c47a | 1567 | |
673e8e59 CH |
1568 | /* |
1569 | * Always re-log the inode so that our permanent transaction can keep | |
1570 | * on rolling it forward in the log. | |
1571 | */ | |
1572 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
1573 | ||
1574 | trace_xfs_itruncate_extents_end(ip, new_size); | |
1575 | ||
8f04c47a CH |
1576 | out: |
1577 | *tpp = tp; | |
1578 | return error; | |
1579 | out_bmap_cancel: | |
1da177e4 | 1580 | /* |
8f04c47a CH |
1581 | * If the bunmapi call encounters an error, return to the caller where |
1582 | * the transaction can be properly aborted. We just need to make sure | |
1583 | * we're not holding any resources that we were not when we came in. | |
1da177e4 | 1584 | */ |
8f04c47a CH |
1585 | xfs_bmap_cancel(&free_list); |
1586 | goto out; | |
1587 | } | |
1588 | ||
c24b5dfa DC |
1589 | int |
1590 | xfs_release( | |
1591 | xfs_inode_t *ip) | |
1592 | { | |
1593 | xfs_mount_t *mp = ip->i_mount; | |
1594 | int error; | |
1595 | ||
1596 | if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0)) | |
1597 | return 0; | |
1598 | ||
1599 | /* If this is a read-only mount, don't do this (would generate I/O) */ | |
1600 | if (mp->m_flags & XFS_MOUNT_RDONLY) | |
1601 | return 0; | |
1602 | ||
1603 | if (!XFS_FORCED_SHUTDOWN(mp)) { | |
1604 | int truncated; | |
1605 | ||
c24b5dfa DC |
1606 | /* |
1607 | * If we previously truncated this file and removed old data | |
1608 | * in the process, we want to initiate "early" writeout on | |
1609 | * the last close. This is an attempt to combat the notorious | |
1610 | * NULL files problem which is particularly noticeable from a | |
1611 | * truncate down, buffered (re-)write (delalloc), followed by | |
1612 | * a crash. What we are effectively doing here is | |
1613 | * significantly reducing the time window where we'd otherwise | |
1614 | * be exposed to that problem. | |
1615 | */ | |
1616 | truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED); | |
1617 | if (truncated) { | |
1618 | xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE); | |
eac152b4 | 1619 | if (ip->i_delayed_blks > 0) { |
2451337d | 1620 | error = filemap_flush(VFS_I(ip)->i_mapping); |
c24b5dfa DC |
1621 | if (error) |
1622 | return error; | |
1623 | } | |
1624 | } | |
1625 | } | |
1626 | ||
1627 | if (ip->i_d.di_nlink == 0) | |
1628 | return 0; | |
1629 | ||
1630 | if (xfs_can_free_eofblocks(ip, false)) { | |
1631 | ||
1632 | /* | |
1633 | * If we can't get the iolock just skip truncating the blocks | |
1634 | * past EOF because we could deadlock with the mmap_sem | |
1635 | * otherwise. We'll get another chance to drop them once the | |
1636 | * last reference to the inode is dropped, so we'll never leak | |
1637 | * blocks permanently. | |
1638 | * | |
1639 | * Further, check if the inode is being opened, written and | |
1640 | * closed frequently and we have delayed allocation blocks | |
1641 | * outstanding (e.g. streaming writes from the NFS server), | |
1642 | * truncating the blocks past EOF will cause fragmentation to | |
1643 | * occur. | |
1644 | * | |
1645 | * In this case don't do the truncation, either, but we have to | |
1646 | * be careful how we detect this case. Blocks beyond EOF show | |
1647 | * up as i_delayed_blks even when the inode is clean, so we | |
1648 | * need to truncate them away first before checking for a dirty | |
1649 | * release. Hence on the first dirty close we will still remove | |
1650 | * the speculative allocation, but after that we will leave it | |
1651 | * in place. | |
1652 | */ | |
1653 | if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE)) | |
1654 | return 0; | |
1655 | ||
1656 | error = xfs_free_eofblocks(mp, ip, true); | |
2451337d | 1657 | if (error && error != -EAGAIN) |
c24b5dfa DC |
1658 | return error; |
1659 | ||
1660 | /* delalloc blocks after truncation means it really is dirty */ | |
1661 | if (ip->i_delayed_blks) | |
1662 | xfs_iflags_set(ip, XFS_IDIRTY_RELEASE); | |
1663 | } | |
1664 | return 0; | |
1665 | } | |
1666 | ||
f7be2d7f BF |
1667 | /* |
1668 | * xfs_inactive_truncate | |
1669 | * | |
1670 | * Called to perform a truncate when an inode becomes unlinked. | |
1671 | */ | |
1672 | STATIC int | |
1673 | xfs_inactive_truncate( | |
1674 | struct xfs_inode *ip) | |
1675 | { | |
1676 | struct xfs_mount *mp = ip->i_mount; | |
1677 | struct xfs_trans *tp; | |
1678 | int error; | |
1679 | ||
1680 | tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); | |
1681 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0); | |
1682 | if (error) { | |
1683 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
4906e215 | 1684 | xfs_trans_cancel(tp); |
f7be2d7f BF |
1685 | return error; |
1686 | } | |
1687 | ||
1688 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1689 | xfs_trans_ijoin(tp, ip, 0); | |
1690 | ||
1691 | /* | |
1692 | * Log the inode size first to prevent stale data exposure in the event | |
1693 | * of a system crash before the truncate completes. See the related | |
1694 | * comment in xfs_setattr_size() for details. | |
1695 | */ | |
1696 | ip->i_d.di_size = 0; | |
1697 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
1698 | ||
1699 | error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0); | |
1700 | if (error) | |
1701 | goto error_trans_cancel; | |
1702 | ||
1703 | ASSERT(ip->i_d.di_nextents == 0); | |
1704 | ||
70393313 | 1705 | error = xfs_trans_commit(tp); |
f7be2d7f BF |
1706 | if (error) |
1707 | goto error_unlock; | |
1708 | ||
1709 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1710 | return 0; | |
1711 | ||
1712 | error_trans_cancel: | |
4906e215 | 1713 | xfs_trans_cancel(tp); |
f7be2d7f BF |
1714 | error_unlock: |
1715 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1716 | return error; | |
1717 | } | |
1718 | ||
88877d2b BF |
1719 | /* |
1720 | * xfs_inactive_ifree() | |
1721 | * | |
1722 | * Perform the inode free when an inode is unlinked. | |
1723 | */ | |
1724 | STATIC int | |
1725 | xfs_inactive_ifree( | |
1726 | struct xfs_inode *ip) | |
1727 | { | |
1728 | xfs_bmap_free_t free_list; | |
1729 | xfs_fsblock_t first_block; | |
1730 | int committed; | |
1731 | struct xfs_mount *mp = ip->i_mount; | |
1732 | struct xfs_trans *tp; | |
1733 | int error; | |
1734 | ||
1735 | tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); | |
9d43b180 BF |
1736 | |
1737 | /* | |
1738 | * The ifree transaction might need to allocate blocks for record | |
1739 | * insertion to the finobt. We don't want to fail here at ENOSPC, so | |
1740 | * allow ifree to dip into the reserved block pool if necessary. | |
1741 | * | |
1742 | * Freeing large sets of inodes generally means freeing inode chunks, | |
1743 | * directory and file data blocks, so this should be relatively safe. | |
1744 | * Only under severe circumstances should it be possible to free enough | |
1745 | * inodes to exhaust the reserve block pool via finobt expansion while | |
1746 | * at the same time not creating free space in the filesystem. | |
1747 | * | |
1748 | * Send a warning if the reservation does happen to fail, as the inode | |
1749 | * now remains allocated and sits on the unlinked list until the fs is | |
1750 | * repaired. | |
1751 | */ | |
1752 | tp->t_flags |= XFS_TRANS_RESERVE; | |
1753 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ifree, | |
1754 | XFS_IFREE_SPACE_RES(mp), 0); | |
88877d2b | 1755 | if (error) { |
2451337d | 1756 | if (error == -ENOSPC) { |
9d43b180 BF |
1757 | xfs_warn_ratelimited(mp, |
1758 | "Failed to remove inode(s) from unlinked list. " | |
1759 | "Please free space, unmount and run xfs_repair."); | |
1760 | } else { | |
1761 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1762 | } | |
4906e215 | 1763 | xfs_trans_cancel(tp); |
88877d2b BF |
1764 | return error; |
1765 | } | |
1766 | ||
1767 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1768 | xfs_trans_ijoin(tp, ip, 0); | |
1769 | ||
1770 | xfs_bmap_init(&free_list, &first_block); | |
1771 | error = xfs_ifree(tp, ip, &free_list); | |
1772 | if (error) { | |
1773 | /* | |
1774 | * If we fail to free the inode, shut down. The cancel | |
1775 | * might do that, we need to make sure. Otherwise the | |
1776 | * inode might be lost for a long time or forever. | |
1777 | */ | |
1778 | if (!XFS_FORCED_SHUTDOWN(mp)) { | |
1779 | xfs_notice(mp, "%s: xfs_ifree returned error %d", | |
1780 | __func__, error); | |
1781 | xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR); | |
1782 | } | |
4906e215 | 1783 | xfs_trans_cancel(tp); |
88877d2b BF |
1784 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
1785 | return error; | |
1786 | } | |
1787 | ||
1788 | /* | |
1789 | * Credit the quota account(s). The inode is gone. | |
1790 | */ | |
1791 | xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1); | |
1792 | ||
1793 | /* | |
1794 | * Just ignore errors at this point. There is nothing we can | |
1795 | * do except to try to keep going. Make sure it's not a silent | |
1796 | * error. | |
1797 | */ | |
1798 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
1799 | if (error) | |
1800 | xfs_notice(mp, "%s: xfs_bmap_finish returned error %d", | |
1801 | __func__, error); | |
70393313 | 1802 | error = xfs_trans_commit(tp); |
88877d2b BF |
1803 | if (error) |
1804 | xfs_notice(mp, "%s: xfs_trans_commit returned error %d", | |
1805 | __func__, error); | |
1806 | ||
1807 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1808 | return 0; | |
1809 | } | |
1810 | ||
c24b5dfa DC |
1811 | /* |
1812 | * xfs_inactive | |
1813 | * | |
1814 | * This is called when the vnode reference count for the vnode | |
1815 | * goes to zero. If the file has been unlinked, then it must | |
1816 | * now be truncated. Also, we clear all of the read-ahead state | |
1817 | * kept for the inode here since the file is now closed. | |
1818 | */ | |
74564fb4 | 1819 | void |
c24b5dfa DC |
1820 | xfs_inactive( |
1821 | xfs_inode_t *ip) | |
1822 | { | |
3d3c8b52 | 1823 | struct xfs_mount *mp; |
3d3c8b52 JL |
1824 | int error; |
1825 | int truncate = 0; | |
c24b5dfa DC |
1826 | |
1827 | /* | |
1828 | * If the inode is already free, then there can be nothing | |
1829 | * to clean up here. | |
1830 | */ | |
d948709b | 1831 | if (ip->i_d.di_mode == 0) { |
c24b5dfa DC |
1832 | ASSERT(ip->i_df.if_real_bytes == 0); |
1833 | ASSERT(ip->i_df.if_broot_bytes == 0); | |
74564fb4 | 1834 | return; |
c24b5dfa DC |
1835 | } |
1836 | ||
1837 | mp = ip->i_mount; | |
1838 | ||
c24b5dfa DC |
1839 | /* If this is a read-only mount, don't do this (would generate I/O) */ |
1840 | if (mp->m_flags & XFS_MOUNT_RDONLY) | |
74564fb4 | 1841 | return; |
c24b5dfa DC |
1842 | |
1843 | if (ip->i_d.di_nlink != 0) { | |
1844 | /* | |
1845 | * force is true because we are evicting an inode from the | |
1846 | * cache. Post-eof blocks must be freed, lest we end up with | |
1847 | * broken free space accounting. | |
1848 | */ | |
74564fb4 BF |
1849 | if (xfs_can_free_eofblocks(ip, true)) |
1850 | xfs_free_eofblocks(mp, ip, false); | |
1851 | ||
1852 | return; | |
c24b5dfa DC |
1853 | } |
1854 | ||
1855 | if (S_ISREG(ip->i_d.di_mode) && | |
1856 | (ip->i_d.di_size != 0 || XFS_ISIZE(ip) != 0 || | |
1857 | ip->i_d.di_nextents > 0 || ip->i_delayed_blks > 0)) | |
1858 | truncate = 1; | |
1859 | ||
1860 | error = xfs_qm_dqattach(ip, 0); | |
1861 | if (error) | |
74564fb4 | 1862 | return; |
c24b5dfa | 1863 | |
f7be2d7f | 1864 | if (S_ISLNK(ip->i_d.di_mode)) |
36b21dde | 1865 | error = xfs_inactive_symlink(ip); |
f7be2d7f BF |
1866 | else if (truncate) |
1867 | error = xfs_inactive_truncate(ip); | |
1868 | if (error) | |
74564fb4 | 1869 | return; |
c24b5dfa DC |
1870 | |
1871 | /* | |
1872 | * If there are attributes associated with the file then blow them away | |
1873 | * now. The code calls a routine that recursively deconstructs the | |
6dfe5a04 | 1874 | * attribute fork. If also blows away the in-core attribute fork. |
c24b5dfa | 1875 | */ |
6dfe5a04 | 1876 | if (XFS_IFORK_Q(ip)) { |
c24b5dfa DC |
1877 | error = xfs_attr_inactive(ip); |
1878 | if (error) | |
74564fb4 | 1879 | return; |
c24b5dfa DC |
1880 | } |
1881 | ||
6dfe5a04 | 1882 | ASSERT(!ip->i_afp); |
c24b5dfa | 1883 | ASSERT(ip->i_d.di_anextents == 0); |
6dfe5a04 | 1884 | ASSERT(ip->i_d.di_forkoff == 0); |
c24b5dfa DC |
1885 | |
1886 | /* | |
1887 | * Free the inode. | |
1888 | */ | |
88877d2b BF |
1889 | error = xfs_inactive_ifree(ip); |
1890 | if (error) | |
74564fb4 | 1891 | return; |
c24b5dfa DC |
1892 | |
1893 | /* | |
1894 | * Release the dquots held by inode, if any. | |
1895 | */ | |
1896 | xfs_qm_dqdetach(ip); | |
c24b5dfa DC |
1897 | } |
1898 | ||
1da177e4 LT |
1899 | /* |
1900 | * This is called when the inode's link count goes to 0. | |
1901 | * We place the on-disk inode on a list in the AGI. It | |
1902 | * will be pulled from this list when the inode is freed. | |
1903 | */ | |
1904 | int | |
1905 | xfs_iunlink( | |
1906 | xfs_trans_t *tp, | |
1907 | xfs_inode_t *ip) | |
1908 | { | |
1909 | xfs_mount_t *mp; | |
1910 | xfs_agi_t *agi; | |
1911 | xfs_dinode_t *dip; | |
1912 | xfs_buf_t *agibp; | |
1913 | xfs_buf_t *ibp; | |
1da177e4 LT |
1914 | xfs_agino_t agino; |
1915 | short bucket_index; | |
1916 | int offset; | |
1917 | int error; | |
1da177e4 LT |
1918 | |
1919 | ASSERT(ip->i_d.di_nlink == 0); | |
1920 | ASSERT(ip->i_d.di_mode != 0); | |
1da177e4 LT |
1921 | |
1922 | mp = tp->t_mountp; | |
1923 | ||
1da177e4 LT |
1924 | /* |
1925 | * Get the agi buffer first. It ensures lock ordering | |
1926 | * on the list. | |
1927 | */ | |
5e1be0fb | 1928 | error = xfs_read_agi(mp, tp, XFS_INO_TO_AGNO(mp, ip->i_ino), &agibp); |
859d7182 | 1929 | if (error) |
1da177e4 | 1930 | return error; |
1da177e4 | 1931 | agi = XFS_BUF_TO_AGI(agibp); |
5e1be0fb | 1932 | |
1da177e4 LT |
1933 | /* |
1934 | * Get the index into the agi hash table for the | |
1935 | * list this inode will go on. | |
1936 | */ | |
1937 | agino = XFS_INO_TO_AGINO(mp, ip->i_ino); | |
1938 | ASSERT(agino != 0); | |
1939 | bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS; | |
1940 | ASSERT(agi->agi_unlinked[bucket_index]); | |
16259e7d | 1941 | ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != agino); |
1da177e4 | 1942 | |
69ef921b | 1943 | if (agi->agi_unlinked[bucket_index] != cpu_to_be32(NULLAGINO)) { |
1da177e4 LT |
1944 | /* |
1945 | * There is already another inode in the bucket we need | |
1946 | * to add ourselves to. Add us at the front of the list. | |
1947 | * Here we put the head pointer into our next pointer, | |
1948 | * and then we fall through to point the head at us. | |
1949 | */ | |
475ee413 CH |
1950 | error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp, |
1951 | 0, 0); | |
c319b58b VA |
1952 | if (error) |
1953 | return error; | |
1954 | ||
69ef921b | 1955 | ASSERT(dip->di_next_unlinked == cpu_to_be32(NULLAGINO)); |
1da177e4 | 1956 | dip->di_next_unlinked = agi->agi_unlinked[bucket_index]; |
92bfc6e7 | 1957 | offset = ip->i_imap.im_boffset + |
1da177e4 | 1958 | offsetof(xfs_dinode_t, di_next_unlinked); |
0a32c26e DC |
1959 | |
1960 | /* need to recalc the inode CRC if appropriate */ | |
1961 | xfs_dinode_calc_crc(mp, dip); | |
1962 | ||
1da177e4 LT |
1963 | xfs_trans_inode_buf(tp, ibp); |
1964 | xfs_trans_log_buf(tp, ibp, offset, | |
1965 | (offset + sizeof(xfs_agino_t) - 1)); | |
1966 | xfs_inobp_check(mp, ibp); | |
1967 | } | |
1968 | ||
1969 | /* | |
1970 | * Point the bucket head pointer at the inode being inserted. | |
1971 | */ | |
1972 | ASSERT(agino != 0); | |
16259e7d | 1973 | agi->agi_unlinked[bucket_index] = cpu_to_be32(agino); |
1da177e4 LT |
1974 | offset = offsetof(xfs_agi_t, agi_unlinked) + |
1975 | (sizeof(xfs_agino_t) * bucket_index); | |
f19b872b | 1976 | xfs_trans_buf_set_type(tp, agibp, XFS_BLFT_AGI_BUF); |
1da177e4 LT |
1977 | xfs_trans_log_buf(tp, agibp, offset, |
1978 | (offset + sizeof(xfs_agino_t) - 1)); | |
1979 | return 0; | |
1980 | } | |
1981 | ||
1982 | /* | |
1983 | * Pull the on-disk inode from the AGI unlinked list. | |
1984 | */ | |
1985 | STATIC int | |
1986 | xfs_iunlink_remove( | |
1987 | xfs_trans_t *tp, | |
1988 | xfs_inode_t *ip) | |
1989 | { | |
1990 | xfs_ino_t next_ino; | |
1991 | xfs_mount_t *mp; | |
1992 | xfs_agi_t *agi; | |
1993 | xfs_dinode_t *dip; | |
1994 | xfs_buf_t *agibp; | |
1995 | xfs_buf_t *ibp; | |
1996 | xfs_agnumber_t agno; | |
1da177e4 LT |
1997 | xfs_agino_t agino; |
1998 | xfs_agino_t next_agino; | |
1999 | xfs_buf_t *last_ibp; | |
6fdf8ccc | 2000 | xfs_dinode_t *last_dip = NULL; |
1da177e4 | 2001 | short bucket_index; |
6fdf8ccc | 2002 | int offset, last_offset = 0; |
1da177e4 | 2003 | int error; |
1da177e4 | 2004 | |
1da177e4 | 2005 | mp = tp->t_mountp; |
1da177e4 | 2006 | agno = XFS_INO_TO_AGNO(mp, ip->i_ino); |
1da177e4 LT |
2007 | |
2008 | /* | |
2009 | * Get the agi buffer first. It ensures lock ordering | |
2010 | * on the list. | |
2011 | */ | |
5e1be0fb CH |
2012 | error = xfs_read_agi(mp, tp, agno, &agibp); |
2013 | if (error) | |
1da177e4 | 2014 | return error; |
5e1be0fb | 2015 | |
1da177e4 | 2016 | agi = XFS_BUF_TO_AGI(agibp); |
5e1be0fb | 2017 | |
1da177e4 LT |
2018 | /* |
2019 | * Get the index into the agi hash table for the | |
2020 | * list this inode will go on. | |
2021 | */ | |
2022 | agino = XFS_INO_TO_AGINO(mp, ip->i_ino); | |
2023 | ASSERT(agino != 0); | |
2024 | bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS; | |
69ef921b | 2025 | ASSERT(agi->agi_unlinked[bucket_index] != cpu_to_be32(NULLAGINO)); |
1da177e4 LT |
2026 | ASSERT(agi->agi_unlinked[bucket_index]); |
2027 | ||
16259e7d | 2028 | if (be32_to_cpu(agi->agi_unlinked[bucket_index]) == agino) { |
1da177e4 | 2029 | /* |
475ee413 CH |
2030 | * We're at the head of the list. Get the inode's on-disk |
2031 | * buffer to see if there is anyone after us on the list. | |
2032 | * Only modify our next pointer if it is not already NULLAGINO. | |
2033 | * This saves us the overhead of dealing with the buffer when | |
2034 | * there is no need to change it. | |
1da177e4 | 2035 | */ |
475ee413 CH |
2036 | error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp, |
2037 | 0, 0); | |
1da177e4 | 2038 | if (error) { |
475ee413 | 2039 | xfs_warn(mp, "%s: xfs_imap_to_bp returned error %d.", |
0b932ccc | 2040 | __func__, error); |
1da177e4 LT |
2041 | return error; |
2042 | } | |
347d1c01 | 2043 | next_agino = be32_to_cpu(dip->di_next_unlinked); |
1da177e4 LT |
2044 | ASSERT(next_agino != 0); |
2045 | if (next_agino != NULLAGINO) { | |
347d1c01 | 2046 | dip->di_next_unlinked = cpu_to_be32(NULLAGINO); |
92bfc6e7 | 2047 | offset = ip->i_imap.im_boffset + |
1da177e4 | 2048 | offsetof(xfs_dinode_t, di_next_unlinked); |
0a32c26e DC |
2049 | |
2050 | /* need to recalc the inode CRC if appropriate */ | |
2051 | xfs_dinode_calc_crc(mp, dip); | |
2052 | ||
1da177e4 LT |
2053 | xfs_trans_inode_buf(tp, ibp); |
2054 | xfs_trans_log_buf(tp, ibp, offset, | |
2055 | (offset + sizeof(xfs_agino_t) - 1)); | |
2056 | xfs_inobp_check(mp, ibp); | |
2057 | } else { | |
2058 | xfs_trans_brelse(tp, ibp); | |
2059 | } | |
2060 | /* | |
2061 | * Point the bucket head pointer at the next inode. | |
2062 | */ | |
2063 | ASSERT(next_agino != 0); | |
2064 | ASSERT(next_agino != agino); | |
16259e7d | 2065 | agi->agi_unlinked[bucket_index] = cpu_to_be32(next_agino); |
1da177e4 LT |
2066 | offset = offsetof(xfs_agi_t, agi_unlinked) + |
2067 | (sizeof(xfs_agino_t) * bucket_index); | |
f19b872b | 2068 | xfs_trans_buf_set_type(tp, agibp, XFS_BLFT_AGI_BUF); |
1da177e4 LT |
2069 | xfs_trans_log_buf(tp, agibp, offset, |
2070 | (offset + sizeof(xfs_agino_t) - 1)); | |
2071 | } else { | |
2072 | /* | |
2073 | * We need to search the list for the inode being freed. | |
2074 | */ | |
16259e7d | 2075 | next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]); |
1da177e4 LT |
2076 | last_ibp = NULL; |
2077 | while (next_agino != agino) { | |
129dbc9a CH |
2078 | struct xfs_imap imap; |
2079 | ||
2080 | if (last_ibp) | |
1da177e4 | 2081 | xfs_trans_brelse(tp, last_ibp); |
129dbc9a CH |
2082 | |
2083 | imap.im_blkno = 0; | |
1da177e4 | 2084 | next_ino = XFS_AGINO_TO_INO(mp, agno, next_agino); |
129dbc9a CH |
2085 | |
2086 | error = xfs_imap(mp, tp, next_ino, &imap, 0); | |
2087 | if (error) { | |
2088 | xfs_warn(mp, | |
2089 | "%s: xfs_imap returned error %d.", | |
2090 | __func__, error); | |
2091 | return error; | |
2092 | } | |
2093 | ||
2094 | error = xfs_imap_to_bp(mp, tp, &imap, &last_dip, | |
2095 | &last_ibp, 0, 0); | |
1da177e4 | 2096 | if (error) { |
0b932ccc | 2097 | xfs_warn(mp, |
129dbc9a | 2098 | "%s: xfs_imap_to_bp returned error %d.", |
0b932ccc | 2099 | __func__, error); |
1da177e4 LT |
2100 | return error; |
2101 | } | |
129dbc9a CH |
2102 | |
2103 | last_offset = imap.im_boffset; | |
347d1c01 | 2104 | next_agino = be32_to_cpu(last_dip->di_next_unlinked); |
1da177e4 LT |
2105 | ASSERT(next_agino != NULLAGINO); |
2106 | ASSERT(next_agino != 0); | |
2107 | } | |
475ee413 | 2108 | |
1da177e4 | 2109 | /* |
475ee413 CH |
2110 | * Now last_ibp points to the buffer previous to us on the |
2111 | * unlinked list. Pull us from the list. | |
1da177e4 | 2112 | */ |
475ee413 CH |
2113 | error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp, |
2114 | 0, 0); | |
1da177e4 | 2115 | if (error) { |
475ee413 | 2116 | xfs_warn(mp, "%s: xfs_imap_to_bp(2) returned error %d.", |
0b932ccc | 2117 | __func__, error); |
1da177e4 LT |
2118 | return error; |
2119 | } | |
347d1c01 | 2120 | next_agino = be32_to_cpu(dip->di_next_unlinked); |
1da177e4 LT |
2121 | ASSERT(next_agino != 0); |
2122 | ASSERT(next_agino != agino); | |
2123 | if (next_agino != NULLAGINO) { | |
347d1c01 | 2124 | dip->di_next_unlinked = cpu_to_be32(NULLAGINO); |
92bfc6e7 | 2125 | offset = ip->i_imap.im_boffset + |
1da177e4 | 2126 | offsetof(xfs_dinode_t, di_next_unlinked); |
0a32c26e DC |
2127 | |
2128 | /* need to recalc the inode CRC if appropriate */ | |
2129 | xfs_dinode_calc_crc(mp, dip); | |
2130 | ||
1da177e4 LT |
2131 | xfs_trans_inode_buf(tp, ibp); |
2132 | xfs_trans_log_buf(tp, ibp, offset, | |
2133 | (offset + sizeof(xfs_agino_t) - 1)); | |
2134 | xfs_inobp_check(mp, ibp); | |
2135 | } else { | |
2136 | xfs_trans_brelse(tp, ibp); | |
2137 | } | |
2138 | /* | |
2139 | * Point the previous inode on the list to the next inode. | |
2140 | */ | |
347d1c01 | 2141 | last_dip->di_next_unlinked = cpu_to_be32(next_agino); |
1da177e4 LT |
2142 | ASSERT(next_agino != 0); |
2143 | offset = last_offset + offsetof(xfs_dinode_t, di_next_unlinked); | |
0a32c26e DC |
2144 | |
2145 | /* need to recalc the inode CRC if appropriate */ | |
2146 | xfs_dinode_calc_crc(mp, last_dip); | |
2147 | ||
1da177e4 LT |
2148 | xfs_trans_inode_buf(tp, last_ibp); |
2149 | xfs_trans_log_buf(tp, last_ibp, offset, | |
2150 | (offset + sizeof(xfs_agino_t) - 1)); | |
2151 | xfs_inobp_check(mp, last_ibp); | |
2152 | } | |
2153 | return 0; | |
2154 | } | |
2155 | ||
5b3eed75 | 2156 | /* |
0b8182db | 2157 | * A big issue when freeing the inode cluster is that we _cannot_ skip any |
5b3eed75 DC |
2158 | * inodes that are in memory - they all must be marked stale and attached to |
2159 | * the cluster buffer. | |
2160 | */ | |
2a30f36d | 2161 | STATIC int |
1da177e4 | 2162 | xfs_ifree_cluster( |
09b56604 BF |
2163 | xfs_inode_t *free_ip, |
2164 | xfs_trans_t *tp, | |
2165 | struct xfs_icluster *xic) | |
1da177e4 LT |
2166 | { |
2167 | xfs_mount_t *mp = free_ip->i_mount; | |
2168 | int blks_per_cluster; | |
982e939e | 2169 | int inodes_per_cluster; |
1da177e4 | 2170 | int nbufs; |
5b257b4a | 2171 | int i, j; |
3cdaa189 | 2172 | int ioffset; |
1da177e4 LT |
2173 | xfs_daddr_t blkno; |
2174 | xfs_buf_t *bp; | |
5b257b4a | 2175 | xfs_inode_t *ip; |
1da177e4 LT |
2176 | xfs_inode_log_item_t *iip; |
2177 | xfs_log_item_t *lip; | |
5017e97d | 2178 | struct xfs_perag *pag; |
09b56604 | 2179 | xfs_ino_t inum; |
1da177e4 | 2180 | |
09b56604 | 2181 | inum = xic->first_ino; |
5017e97d | 2182 | pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, inum)); |
982e939e JL |
2183 | blks_per_cluster = xfs_icluster_size_fsb(mp); |
2184 | inodes_per_cluster = blks_per_cluster << mp->m_sb.sb_inopblog; | |
2185 | nbufs = mp->m_ialloc_blks / blks_per_cluster; | |
1da177e4 | 2186 | |
982e939e | 2187 | for (j = 0; j < nbufs; j++, inum += inodes_per_cluster) { |
09b56604 BF |
2188 | /* |
2189 | * The allocation bitmap tells us which inodes of the chunk were | |
2190 | * physically allocated. Skip the cluster if an inode falls into | |
2191 | * a sparse region. | |
2192 | */ | |
3cdaa189 BF |
2193 | ioffset = inum - xic->first_ino; |
2194 | if ((xic->alloc & XFS_INOBT_MASK(ioffset)) == 0) { | |
2195 | ASSERT(do_mod(ioffset, inodes_per_cluster) == 0); | |
09b56604 BF |
2196 | continue; |
2197 | } | |
2198 | ||
1da177e4 LT |
2199 | blkno = XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, inum), |
2200 | XFS_INO_TO_AGBNO(mp, inum)); | |
2201 | ||
5b257b4a DC |
2202 | /* |
2203 | * We obtain and lock the backing buffer first in the process | |
2204 | * here, as we have to ensure that any dirty inode that we | |
2205 | * can't get the flush lock on is attached to the buffer. | |
2206 | * If we scan the in-memory inodes first, then buffer IO can | |
2207 | * complete before we get a lock on it, and hence we may fail | |
2208 | * to mark all the active inodes on the buffer stale. | |
2209 | */ | |
2210 | bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno, | |
b6aff29f DC |
2211 | mp->m_bsize * blks_per_cluster, |
2212 | XBF_UNMAPPED); | |
5b257b4a | 2213 | |
2a30f36d | 2214 | if (!bp) |
2451337d | 2215 | return -ENOMEM; |
b0f539de DC |
2216 | |
2217 | /* | |
2218 | * This buffer may not have been correctly initialised as we | |
2219 | * didn't read it from disk. That's not important because we are | |
2220 | * only using to mark the buffer as stale in the log, and to | |
2221 | * attach stale cached inodes on it. That means it will never be | |
2222 | * dispatched for IO. If it is, we want to know about it, and we | |
2223 | * want it to fail. We can acheive this by adding a write | |
2224 | * verifier to the buffer. | |
2225 | */ | |
1813dd64 | 2226 | bp->b_ops = &xfs_inode_buf_ops; |
b0f539de | 2227 | |
5b257b4a DC |
2228 | /* |
2229 | * Walk the inodes already attached to the buffer and mark them | |
2230 | * stale. These will all have the flush locks held, so an | |
5b3eed75 DC |
2231 | * in-memory inode walk can't lock them. By marking them all |
2232 | * stale first, we will not attempt to lock them in the loop | |
2233 | * below as the XFS_ISTALE flag will be set. | |
5b257b4a | 2234 | */ |
adadbeef | 2235 | lip = bp->b_fspriv; |
5b257b4a DC |
2236 | while (lip) { |
2237 | if (lip->li_type == XFS_LI_INODE) { | |
2238 | iip = (xfs_inode_log_item_t *)lip; | |
2239 | ASSERT(iip->ili_logged == 1); | |
ca30b2a7 | 2240 | lip->li_cb = xfs_istale_done; |
5b257b4a DC |
2241 | xfs_trans_ail_copy_lsn(mp->m_ail, |
2242 | &iip->ili_flush_lsn, | |
2243 | &iip->ili_item.li_lsn); | |
2244 | xfs_iflags_set(iip->ili_inode, XFS_ISTALE); | |
5b257b4a DC |
2245 | } |
2246 | lip = lip->li_bio_list; | |
2247 | } | |
1da177e4 | 2248 | |
5b3eed75 | 2249 | |
1da177e4 | 2250 | /* |
5b257b4a DC |
2251 | * For each inode in memory attempt to add it to the inode |
2252 | * buffer and set it up for being staled on buffer IO | |
2253 | * completion. This is safe as we've locked out tail pushing | |
2254 | * and flushing by locking the buffer. | |
1da177e4 | 2255 | * |
5b257b4a DC |
2256 | * We have already marked every inode that was part of a |
2257 | * transaction stale above, which means there is no point in | |
2258 | * even trying to lock them. | |
1da177e4 | 2259 | */ |
982e939e | 2260 | for (i = 0; i < inodes_per_cluster; i++) { |
5b3eed75 | 2261 | retry: |
1a3e8f3d | 2262 | rcu_read_lock(); |
da353b0d DC |
2263 | ip = radix_tree_lookup(&pag->pag_ici_root, |
2264 | XFS_INO_TO_AGINO(mp, (inum + i))); | |
1da177e4 | 2265 | |
1a3e8f3d DC |
2266 | /* Inode not in memory, nothing to do */ |
2267 | if (!ip) { | |
2268 | rcu_read_unlock(); | |
1da177e4 LT |
2269 | continue; |
2270 | } | |
2271 | ||
1a3e8f3d DC |
2272 | /* |
2273 | * because this is an RCU protected lookup, we could | |
2274 | * find a recently freed or even reallocated inode | |
2275 | * during the lookup. We need to check under the | |
2276 | * i_flags_lock for a valid inode here. Skip it if it | |
2277 | * is not valid, the wrong inode or stale. | |
2278 | */ | |
2279 | spin_lock(&ip->i_flags_lock); | |
2280 | if (ip->i_ino != inum + i || | |
2281 | __xfs_iflags_test(ip, XFS_ISTALE)) { | |
2282 | spin_unlock(&ip->i_flags_lock); | |
2283 | rcu_read_unlock(); | |
2284 | continue; | |
2285 | } | |
2286 | spin_unlock(&ip->i_flags_lock); | |
2287 | ||
5b3eed75 DC |
2288 | /* |
2289 | * Don't try to lock/unlock the current inode, but we | |
2290 | * _cannot_ skip the other inodes that we did not find | |
2291 | * in the list attached to the buffer and are not | |
2292 | * already marked stale. If we can't lock it, back off | |
2293 | * and retry. | |
2294 | */ | |
5b257b4a DC |
2295 | if (ip != free_ip && |
2296 | !xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) { | |
1a3e8f3d | 2297 | rcu_read_unlock(); |
5b3eed75 DC |
2298 | delay(1); |
2299 | goto retry; | |
1da177e4 | 2300 | } |
1a3e8f3d | 2301 | rcu_read_unlock(); |
1da177e4 | 2302 | |
5b3eed75 | 2303 | xfs_iflock(ip); |
5b257b4a | 2304 | xfs_iflags_set(ip, XFS_ISTALE); |
1da177e4 | 2305 | |
5b3eed75 DC |
2306 | /* |
2307 | * we don't need to attach clean inodes or those only | |
2308 | * with unlogged changes (which we throw away, anyway). | |
2309 | */ | |
1da177e4 | 2310 | iip = ip->i_itemp; |
5b3eed75 | 2311 | if (!iip || xfs_inode_clean(ip)) { |
5b257b4a | 2312 | ASSERT(ip != free_ip); |
1da177e4 LT |
2313 | xfs_ifunlock(ip); |
2314 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
2315 | continue; | |
2316 | } | |
2317 | ||
f5d8d5c4 CH |
2318 | iip->ili_last_fields = iip->ili_fields; |
2319 | iip->ili_fields = 0; | |
1da177e4 | 2320 | iip->ili_logged = 1; |
7b2e2a31 DC |
2321 | xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn, |
2322 | &iip->ili_item.li_lsn); | |
1da177e4 | 2323 | |
ca30b2a7 CH |
2324 | xfs_buf_attach_iodone(bp, xfs_istale_done, |
2325 | &iip->ili_item); | |
5b257b4a DC |
2326 | |
2327 | if (ip != free_ip) | |
1da177e4 | 2328 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
1da177e4 LT |
2329 | } |
2330 | ||
5b3eed75 | 2331 | xfs_trans_stale_inode_buf(tp, bp); |
1da177e4 LT |
2332 | xfs_trans_binval(tp, bp); |
2333 | } | |
2334 | ||
5017e97d | 2335 | xfs_perag_put(pag); |
2a30f36d | 2336 | return 0; |
1da177e4 LT |
2337 | } |
2338 | ||
2339 | /* | |
2340 | * This is called to return an inode to the inode free list. | |
2341 | * The inode should already be truncated to 0 length and have | |
2342 | * no pages associated with it. This routine also assumes that | |
2343 | * the inode is already a part of the transaction. | |
2344 | * | |
2345 | * The on-disk copy of the inode will have been added to the list | |
2346 | * of unlinked inodes in the AGI. We need to remove the inode from | |
2347 | * that list atomically with respect to freeing it here. | |
2348 | */ | |
2349 | int | |
2350 | xfs_ifree( | |
2351 | xfs_trans_t *tp, | |
2352 | xfs_inode_t *ip, | |
2353 | xfs_bmap_free_t *flist) | |
2354 | { | |
2355 | int error; | |
09b56604 | 2356 | struct xfs_icluster xic = { 0 }; |
1da177e4 | 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 | 2371 | |
09b56604 | 2372 | error = xfs_difree(tp, ip->i_ino, flist, &xic); |
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 | ||
09b56604 BF |
2389 | if (xic.deleted) |
2390 | error = xfs_ifree_cluster(ip, tp, &xic); | |
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; | |
c24b5dfa | 2477 | int committed; |
c24b5dfa | 2478 | uint resblks; |
c24b5dfa DC |
2479 | |
2480 | trace_xfs_remove(dp, name); | |
2481 | ||
2482 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2451337d | 2483 | return -EIO; |
c24b5dfa DC |
2484 | |
2485 | error = xfs_qm_dqattach(dp, 0); | |
2486 | if (error) | |
2487 | goto std_return; | |
2488 | ||
2489 | error = xfs_qm_dqattach(ip, 0); | |
2490 | if (error) | |
2491 | goto std_return; | |
2492 | ||
32296f86 | 2493 | if (is_dir) |
c24b5dfa | 2494 | tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR); |
32296f86 | 2495 | else |
c24b5dfa | 2496 | tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE); |
c24b5dfa DC |
2497 | |
2498 | /* | |
2499 | * We try to get the real space reservation first, | |
2500 | * allowing for directory btree deletion(s) implying | |
2501 | * possible bmap insert(s). If we can't get the space | |
2502 | * reservation then we use 0 instead, and avoid the bmap | |
2503 | * btree insert(s) in the directory code by, if the bmap | |
2504 | * insert tries to happen, instead trimming the LAST | |
2505 | * block from the directory. | |
2506 | */ | |
2507 | resblks = XFS_REMOVE_SPACE_RES(mp); | |
3d3c8b52 | 2508 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_remove, resblks, 0); |
2451337d | 2509 | if (error == -ENOSPC) { |
c24b5dfa | 2510 | resblks = 0; |
3d3c8b52 | 2511 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_remove, 0, 0); |
c24b5dfa DC |
2512 | } |
2513 | if (error) { | |
2451337d | 2514 | ASSERT(error != -ENOSPC); |
c24b5dfa DC |
2515 | goto out_trans_cancel; |
2516 | } | |
2517 | ||
2518 | xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL); | |
2519 | ||
2520 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
2521 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
2522 | ||
2523 | /* | |
2524 | * If we're removing a directory perform some additional validation. | |
2525 | */ | |
2526 | if (is_dir) { | |
2527 | ASSERT(ip->i_d.di_nlink >= 2); | |
2528 | if (ip->i_d.di_nlink != 2) { | |
2451337d | 2529 | error = -ENOTEMPTY; |
c24b5dfa DC |
2530 | goto out_trans_cancel; |
2531 | } | |
2532 | if (!xfs_dir_isempty(ip)) { | |
2451337d | 2533 | error = -ENOTEMPTY; |
c24b5dfa DC |
2534 | goto out_trans_cancel; |
2535 | } | |
c24b5dfa | 2536 | |
27320369 | 2537 | /* Drop the link from ip's "..". */ |
c24b5dfa DC |
2538 | error = xfs_droplink(tp, dp); |
2539 | if (error) | |
27320369 | 2540 | goto out_trans_cancel; |
c24b5dfa | 2541 | |
27320369 | 2542 | /* Drop the "." link from ip to self. */ |
c24b5dfa DC |
2543 | error = xfs_droplink(tp, ip); |
2544 | if (error) | |
27320369 | 2545 | goto out_trans_cancel; |
c24b5dfa DC |
2546 | } else { |
2547 | /* | |
2548 | * When removing a non-directory we need to log the parent | |
2549 | * inode here. For a directory this is done implicitly | |
2550 | * by the xfs_droplink call for the ".." entry. | |
2551 | */ | |
2552 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
2553 | } | |
27320369 | 2554 | xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
c24b5dfa | 2555 | |
27320369 | 2556 | /* Drop the link from dp to ip. */ |
c24b5dfa DC |
2557 | error = xfs_droplink(tp, ip); |
2558 | if (error) | |
27320369 | 2559 | goto out_trans_cancel; |
c24b5dfa | 2560 | |
27320369 DC |
2561 | xfs_bmap_init(&free_list, &first_block); |
2562 | error = xfs_dir_removename(tp, dp, name, ip->i_ino, | |
2563 | &first_block, &free_list, resblks); | |
2564 | if (error) { | |
2451337d | 2565 | ASSERT(error != -ENOENT); |
27320369 DC |
2566 | goto out_bmap_cancel; |
2567 | } | |
2568 | ||
c24b5dfa DC |
2569 | /* |
2570 | * If this is a synchronous mount, make sure that the | |
2571 | * remove transaction goes to disk before returning to | |
2572 | * the user. | |
2573 | */ | |
2574 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) | |
2575 | xfs_trans_set_sync(tp); | |
2576 | ||
2577 | error = xfs_bmap_finish(&tp, &free_list, &committed); | |
2578 | if (error) | |
2579 | goto out_bmap_cancel; | |
2580 | ||
70393313 | 2581 | error = xfs_trans_commit(tp); |
c24b5dfa DC |
2582 | if (error) |
2583 | goto std_return; | |
2584 | ||
2cd2ef6a | 2585 | if (is_dir && xfs_inode_is_filestream(ip)) |
c24b5dfa DC |
2586 | xfs_filestream_deassociate(ip); |
2587 | ||
2588 | return 0; | |
2589 | ||
2590 | out_bmap_cancel: | |
2591 | xfs_bmap_cancel(&free_list); | |
c24b5dfa | 2592 | out_trans_cancel: |
4906e215 | 2593 | xfs_trans_cancel(tp); |
c24b5dfa DC |
2594 | std_return: |
2595 | return error; | |
2596 | } | |
2597 | ||
f6bba201 DC |
2598 | /* |
2599 | * Enter all inodes for a rename transaction into a sorted array. | |
2600 | */ | |
95afcf5c | 2601 | #define __XFS_SORT_INODES 5 |
f6bba201 DC |
2602 | STATIC void |
2603 | xfs_sort_for_rename( | |
95afcf5c DC |
2604 | struct xfs_inode *dp1, /* in: old (source) directory inode */ |
2605 | struct xfs_inode *dp2, /* in: new (target) directory inode */ | |
2606 | struct xfs_inode *ip1, /* in: inode of old entry */ | |
2607 | struct xfs_inode *ip2, /* in: inode of new entry */ | |
2608 | struct xfs_inode *wip, /* in: whiteout inode */ | |
2609 | struct xfs_inode **i_tab,/* out: sorted array of inodes */ | |
2610 | int *num_inodes) /* in/out: inodes in array */ | |
f6bba201 | 2611 | { |
f6bba201 DC |
2612 | int i, j; |
2613 | ||
95afcf5c DC |
2614 | ASSERT(*num_inodes == __XFS_SORT_INODES); |
2615 | memset(i_tab, 0, *num_inodes * sizeof(struct xfs_inode *)); | |
2616 | ||
f6bba201 DC |
2617 | /* |
2618 | * i_tab contains a list of pointers to inodes. We initialize | |
2619 | * the table here & we'll sort it. We will then use it to | |
2620 | * order the acquisition of the inode locks. | |
2621 | * | |
2622 | * Note that the table may contain duplicates. e.g., dp1 == dp2. | |
2623 | */ | |
95afcf5c DC |
2624 | i = 0; |
2625 | i_tab[i++] = dp1; | |
2626 | i_tab[i++] = dp2; | |
2627 | i_tab[i++] = ip1; | |
2628 | if (ip2) | |
2629 | i_tab[i++] = ip2; | |
2630 | if (wip) | |
2631 | i_tab[i++] = wip; | |
2632 | *num_inodes = i; | |
f6bba201 DC |
2633 | |
2634 | /* | |
2635 | * Sort the elements via bubble sort. (Remember, there are at | |
95afcf5c | 2636 | * most 5 elements to sort, so this is adequate.) |
f6bba201 DC |
2637 | */ |
2638 | for (i = 0; i < *num_inodes; i++) { | |
2639 | for (j = 1; j < *num_inodes; j++) { | |
2640 | if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) { | |
95afcf5c | 2641 | struct xfs_inode *temp = i_tab[j]; |
f6bba201 DC |
2642 | i_tab[j] = i_tab[j-1]; |
2643 | i_tab[j-1] = temp; | |
2644 | } | |
2645 | } | |
2646 | } | |
2647 | } | |
2648 | ||
310606b0 DC |
2649 | static int |
2650 | xfs_finish_rename( | |
2651 | struct xfs_trans *tp, | |
2652 | struct xfs_bmap_free *free_list) | |
2653 | { | |
2654 | int committed = 0; | |
2655 | int error; | |
2656 | ||
2657 | /* | |
2658 | * If this is a synchronous mount, make sure that the rename transaction | |
2659 | * goes to disk before returning to the user. | |
2660 | */ | |
2661 | if (tp->t_mountp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) | |
2662 | xfs_trans_set_sync(tp); | |
2663 | ||
2664 | error = xfs_bmap_finish(&tp, free_list, &committed); | |
2665 | if (error) { | |
2666 | xfs_bmap_cancel(free_list); | |
4906e215 | 2667 | xfs_trans_cancel(tp); |
310606b0 DC |
2668 | return error; |
2669 | } | |
2670 | ||
70393313 | 2671 | return xfs_trans_commit(tp); |
310606b0 DC |
2672 | } |
2673 | ||
d31a1825 CM |
2674 | /* |
2675 | * xfs_cross_rename() | |
2676 | * | |
2677 | * responsible for handling RENAME_EXCHANGE flag in renameat2() sytemcall | |
2678 | */ | |
2679 | STATIC int | |
2680 | xfs_cross_rename( | |
2681 | struct xfs_trans *tp, | |
2682 | struct xfs_inode *dp1, | |
2683 | struct xfs_name *name1, | |
2684 | struct xfs_inode *ip1, | |
2685 | struct xfs_inode *dp2, | |
2686 | struct xfs_name *name2, | |
2687 | struct xfs_inode *ip2, | |
2688 | struct xfs_bmap_free *free_list, | |
2689 | xfs_fsblock_t *first_block, | |
2690 | int spaceres) | |
2691 | { | |
2692 | int error = 0; | |
2693 | int ip1_flags = 0; | |
2694 | int ip2_flags = 0; | |
2695 | int dp2_flags = 0; | |
2696 | ||
2697 | /* Swap inode number for dirent in first parent */ | |
2698 | error = xfs_dir_replace(tp, dp1, name1, | |
2699 | ip2->i_ino, | |
2700 | first_block, free_list, spaceres); | |
2701 | if (error) | |
eeacd321 | 2702 | goto out_trans_abort; |
d31a1825 CM |
2703 | |
2704 | /* Swap inode number for dirent in second parent */ | |
2705 | error = xfs_dir_replace(tp, dp2, name2, | |
2706 | ip1->i_ino, | |
2707 | first_block, free_list, spaceres); | |
2708 | if (error) | |
eeacd321 | 2709 | goto out_trans_abort; |
d31a1825 CM |
2710 | |
2711 | /* | |
2712 | * If we're renaming one or more directories across different parents, | |
2713 | * update the respective ".." entries (and link counts) to match the new | |
2714 | * parents. | |
2715 | */ | |
2716 | if (dp1 != dp2) { | |
2717 | dp2_flags = XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG; | |
2718 | ||
2719 | if (S_ISDIR(ip2->i_d.di_mode)) { | |
2720 | error = xfs_dir_replace(tp, ip2, &xfs_name_dotdot, | |
2721 | dp1->i_ino, first_block, | |
2722 | free_list, spaceres); | |
2723 | if (error) | |
eeacd321 | 2724 | goto out_trans_abort; |
d31a1825 CM |
2725 | |
2726 | /* transfer ip2 ".." reference to dp1 */ | |
2727 | if (!S_ISDIR(ip1->i_d.di_mode)) { | |
2728 | error = xfs_droplink(tp, dp2); | |
2729 | if (error) | |
eeacd321 | 2730 | goto out_trans_abort; |
d31a1825 CM |
2731 | error = xfs_bumplink(tp, dp1); |
2732 | if (error) | |
eeacd321 | 2733 | goto out_trans_abort; |
d31a1825 CM |
2734 | } |
2735 | ||
2736 | /* | |
2737 | * Although ip1 isn't changed here, userspace needs | |
2738 | * to be warned about the change, so that applications | |
2739 | * relying on it (like backup ones), will properly | |
2740 | * notify the change | |
2741 | */ | |
2742 | ip1_flags |= XFS_ICHGTIME_CHG; | |
2743 | ip2_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG; | |
2744 | } | |
2745 | ||
2746 | if (S_ISDIR(ip1->i_d.di_mode)) { | |
2747 | error = xfs_dir_replace(tp, ip1, &xfs_name_dotdot, | |
2748 | dp2->i_ino, first_block, | |
2749 | free_list, spaceres); | |
2750 | if (error) | |
eeacd321 | 2751 | goto out_trans_abort; |
d31a1825 CM |
2752 | |
2753 | /* transfer ip1 ".." reference to dp2 */ | |
2754 | if (!S_ISDIR(ip2->i_d.di_mode)) { | |
2755 | error = xfs_droplink(tp, dp1); | |
2756 | if (error) | |
eeacd321 | 2757 | goto out_trans_abort; |
d31a1825 CM |
2758 | error = xfs_bumplink(tp, dp2); |
2759 | if (error) | |
eeacd321 | 2760 | goto out_trans_abort; |
d31a1825 CM |
2761 | } |
2762 | ||
2763 | /* | |
2764 | * Although ip2 isn't changed here, userspace needs | |
2765 | * to be warned about the change, so that applications | |
2766 | * relying on it (like backup ones), will properly | |
2767 | * notify the change | |
2768 | */ | |
2769 | ip1_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG; | |
2770 | ip2_flags |= XFS_ICHGTIME_CHG; | |
2771 | } | |
2772 | } | |
2773 | ||
2774 | if (ip1_flags) { | |
2775 | xfs_trans_ichgtime(tp, ip1, ip1_flags); | |
2776 | xfs_trans_log_inode(tp, ip1, XFS_ILOG_CORE); | |
2777 | } | |
2778 | if (ip2_flags) { | |
2779 | xfs_trans_ichgtime(tp, ip2, ip2_flags); | |
2780 | xfs_trans_log_inode(tp, ip2, XFS_ILOG_CORE); | |
2781 | } | |
2782 | if (dp2_flags) { | |
2783 | xfs_trans_ichgtime(tp, dp2, dp2_flags); | |
2784 | xfs_trans_log_inode(tp, dp2, XFS_ILOG_CORE); | |
2785 | } | |
2786 | xfs_trans_ichgtime(tp, dp1, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
2787 | xfs_trans_log_inode(tp, dp1, XFS_ILOG_CORE); | |
eeacd321 DC |
2788 | return xfs_finish_rename(tp, free_list); |
2789 | ||
2790 | out_trans_abort: | |
2791 | xfs_bmap_cancel(free_list); | |
4906e215 | 2792 | xfs_trans_cancel(tp); |
d31a1825 CM |
2793 | return error; |
2794 | } | |
2795 | ||
7dcf5c3e DC |
2796 | /* |
2797 | * xfs_rename_alloc_whiteout() | |
2798 | * | |
2799 | * Return a referenced, unlinked, unlocked inode that that can be used as a | |
2800 | * whiteout in a rename transaction. We use a tmpfile inode here so that if we | |
2801 | * crash between allocating the inode and linking it into the rename transaction | |
2802 | * recovery will free the inode and we won't leak it. | |
2803 | */ | |
2804 | static int | |
2805 | xfs_rename_alloc_whiteout( | |
2806 | struct xfs_inode *dp, | |
2807 | struct xfs_inode **wip) | |
2808 | { | |
2809 | struct xfs_inode *tmpfile; | |
2810 | int error; | |
2811 | ||
2812 | error = xfs_create_tmpfile(dp, NULL, S_IFCHR | WHITEOUT_MODE, &tmpfile); | |
2813 | if (error) | |
2814 | return error; | |
2815 | ||
22419ac9 BF |
2816 | /* |
2817 | * Prepare the tmpfile inode as if it were created through the VFS. | |
2818 | * Otherwise, the link increment paths will complain about nlink 0->1. | |
2819 | * Drop the link count as done by d_tmpfile(), complete the inode setup | |
2820 | * and flag it as linkable. | |
2821 | */ | |
2822 | drop_nlink(VFS_I(tmpfile)); | |
7dcf5c3e DC |
2823 | xfs_finish_inode_setup(tmpfile); |
2824 | VFS_I(tmpfile)->i_state |= I_LINKABLE; | |
2825 | ||
2826 | *wip = tmpfile; | |
2827 | return 0; | |
2828 | } | |
2829 | ||
f6bba201 DC |
2830 | /* |
2831 | * xfs_rename | |
2832 | */ | |
2833 | int | |
2834 | xfs_rename( | |
7dcf5c3e DC |
2835 | struct xfs_inode *src_dp, |
2836 | struct xfs_name *src_name, | |
2837 | struct xfs_inode *src_ip, | |
2838 | struct xfs_inode *target_dp, | |
2839 | struct xfs_name *target_name, | |
2840 | struct xfs_inode *target_ip, | |
2841 | unsigned int flags) | |
f6bba201 | 2842 | { |
7dcf5c3e DC |
2843 | struct xfs_mount *mp = src_dp->i_mount; |
2844 | struct xfs_trans *tp; | |
2845 | struct xfs_bmap_free free_list; | |
2846 | xfs_fsblock_t first_block; | |
2847 | struct xfs_inode *wip = NULL; /* whiteout inode */ | |
2848 | struct xfs_inode *inodes[__XFS_SORT_INODES]; | |
2849 | int num_inodes = __XFS_SORT_INODES; | |
2b93681f DC |
2850 | bool new_parent = (src_dp != target_dp); |
2851 | bool src_is_directory = S_ISDIR(src_ip->i_d.di_mode); | |
7dcf5c3e DC |
2852 | int spaceres; |
2853 | int error; | |
f6bba201 DC |
2854 | |
2855 | trace_xfs_rename(src_dp, target_dp, src_name, target_name); | |
2856 | ||
eeacd321 DC |
2857 | if ((flags & RENAME_EXCHANGE) && !target_ip) |
2858 | return -EINVAL; | |
2859 | ||
7dcf5c3e DC |
2860 | /* |
2861 | * If we are doing a whiteout operation, allocate the whiteout inode | |
2862 | * we will be placing at the target and ensure the type is set | |
2863 | * appropriately. | |
2864 | */ | |
2865 | if (flags & RENAME_WHITEOUT) { | |
2866 | ASSERT(!(flags & (RENAME_NOREPLACE | RENAME_EXCHANGE))); | |
2867 | error = xfs_rename_alloc_whiteout(target_dp, &wip); | |
2868 | if (error) | |
2869 | return error; | |
2870 | ||
2871 | /* setup target dirent info as whiteout */ | |
2872 | src_name->type = XFS_DIR3_FT_CHRDEV; | |
2873 | } | |
f6bba201 | 2874 | |
7dcf5c3e | 2875 | xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip, wip, |
f6bba201 DC |
2876 | inodes, &num_inodes); |
2877 | ||
f6bba201 | 2878 | tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME); |
f6bba201 | 2879 | spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len); |
3d3c8b52 | 2880 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_rename, spaceres, 0); |
2451337d | 2881 | if (error == -ENOSPC) { |
f6bba201 | 2882 | spaceres = 0; |
3d3c8b52 | 2883 | error = xfs_trans_reserve(tp, &M_RES(mp)->tr_rename, 0, 0); |
f6bba201 | 2884 | } |
445883e8 DC |
2885 | if (error) |
2886 | goto out_trans_cancel; | |
f6bba201 DC |
2887 | |
2888 | /* | |
2889 | * Attach the dquots to the inodes | |
2890 | */ | |
2891 | error = xfs_qm_vop_rename_dqattach(inodes); | |
445883e8 DC |
2892 | if (error) |
2893 | goto out_trans_cancel; | |
f6bba201 DC |
2894 | |
2895 | /* | |
2896 | * Lock all the participating inodes. Depending upon whether | |
2897 | * the target_name exists in the target directory, and | |
2898 | * whether the target directory is the same as the source | |
2899 | * directory, we can lock from 2 to 4 inodes. | |
2900 | */ | |
2901 | xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL); | |
2902 | ||
2903 | /* | |
2904 | * Join all the inodes to the transaction. From this point on, | |
2905 | * we can rely on either trans_commit or trans_cancel to unlock | |
2906 | * them. | |
2907 | */ | |
2908 | xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL); | |
2909 | if (new_parent) | |
2910 | xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL); | |
2911 | xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL); | |
2912 | if (target_ip) | |
2913 | xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL); | |
7dcf5c3e DC |
2914 | if (wip) |
2915 | xfs_trans_ijoin(tp, wip, XFS_ILOCK_EXCL); | |
f6bba201 DC |
2916 | |
2917 | /* | |
2918 | * If we are using project inheritance, we only allow renames | |
2919 | * into our tree when the project IDs are the same; else the | |
2920 | * tree quota mechanism would be circumvented. | |
2921 | */ | |
2922 | if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && | |
2923 | (xfs_get_projid(target_dp) != xfs_get_projid(src_ip)))) { | |
2451337d | 2924 | error = -EXDEV; |
445883e8 | 2925 | goto out_trans_cancel; |
f6bba201 DC |
2926 | } |
2927 | ||
445883e8 DC |
2928 | xfs_bmap_init(&free_list, &first_block); |
2929 | ||
eeacd321 DC |
2930 | /* RENAME_EXCHANGE is unique from here on. */ |
2931 | if (flags & RENAME_EXCHANGE) | |
2932 | return xfs_cross_rename(tp, src_dp, src_name, src_ip, | |
2933 | target_dp, target_name, target_ip, | |
2934 | &free_list, &first_block, spaceres); | |
d31a1825 | 2935 | |
f6bba201 DC |
2936 | /* |
2937 | * Set up the target. | |
2938 | */ | |
2939 | if (target_ip == NULL) { | |
2940 | /* | |
2941 | * If there's no space reservation, check the entry will | |
2942 | * fit before actually inserting it. | |
2943 | */ | |
94f3cad5 ES |
2944 | if (!spaceres) { |
2945 | error = xfs_dir_canenter(tp, target_dp, target_name); | |
2946 | if (error) | |
445883e8 | 2947 | goto out_trans_cancel; |
94f3cad5 | 2948 | } |
f6bba201 DC |
2949 | /* |
2950 | * If target does not exist and the rename crosses | |
2951 | * directories, adjust the target directory link count | |
2952 | * to account for the ".." reference from the new entry. | |
2953 | */ | |
2954 | error = xfs_dir_createname(tp, target_dp, target_name, | |
2955 | src_ip->i_ino, &first_block, | |
2956 | &free_list, spaceres); | |
f6bba201 | 2957 | if (error) |
4906e215 | 2958 | goto out_bmap_cancel; |
f6bba201 DC |
2959 | |
2960 | xfs_trans_ichgtime(tp, target_dp, | |
2961 | XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
2962 | ||
2963 | if (new_parent && src_is_directory) { | |
2964 | error = xfs_bumplink(tp, target_dp); | |
2965 | if (error) | |
4906e215 | 2966 | goto out_bmap_cancel; |
f6bba201 DC |
2967 | } |
2968 | } else { /* target_ip != NULL */ | |
2969 | /* | |
2970 | * If target exists and it's a directory, check that both | |
2971 | * target and source are directories and that target can be | |
2972 | * destroyed, or that neither is a directory. | |
2973 | */ | |
2974 | if (S_ISDIR(target_ip->i_d.di_mode)) { | |
2975 | /* | |
2976 | * Make sure target dir is empty. | |
2977 | */ | |
2978 | if (!(xfs_dir_isempty(target_ip)) || | |
2979 | (target_ip->i_d.di_nlink > 2)) { | |
2451337d | 2980 | error = -EEXIST; |
445883e8 | 2981 | goto out_trans_cancel; |
f6bba201 DC |
2982 | } |
2983 | } | |
2984 | ||
2985 | /* | |
2986 | * Link the source inode under the target name. | |
2987 | * If the source inode is a directory and we are moving | |
2988 | * it across directories, its ".." entry will be | |
2989 | * inconsistent until we replace that down below. | |
2990 | * | |
2991 | * In case there is already an entry with the same | |
2992 | * name at the destination directory, remove it first. | |
2993 | */ | |
2994 | error = xfs_dir_replace(tp, target_dp, target_name, | |
2995 | src_ip->i_ino, | |
2996 | &first_block, &free_list, spaceres); | |
2997 | if (error) | |
4906e215 | 2998 | goto out_bmap_cancel; |
f6bba201 DC |
2999 | |
3000 | xfs_trans_ichgtime(tp, target_dp, | |
3001 | XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
3002 | ||
3003 | /* | |
3004 | * Decrement the link count on the target since the target | |
3005 | * dir no longer points to it. | |
3006 | */ | |
3007 | error = xfs_droplink(tp, target_ip); | |
3008 | if (error) | |
4906e215 | 3009 | goto out_bmap_cancel; |
f6bba201 DC |
3010 | |
3011 | if (src_is_directory) { | |
3012 | /* | |
3013 | * Drop the link from the old "." entry. | |
3014 | */ | |
3015 | error = xfs_droplink(tp, target_ip); | |
3016 | if (error) | |
4906e215 | 3017 | goto out_bmap_cancel; |
f6bba201 DC |
3018 | } |
3019 | } /* target_ip != NULL */ | |
3020 | ||
3021 | /* | |
3022 | * Remove the source. | |
3023 | */ | |
3024 | if (new_parent && src_is_directory) { | |
3025 | /* | |
3026 | * Rewrite the ".." entry to point to the new | |
3027 | * directory. | |
3028 | */ | |
3029 | error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot, | |
3030 | target_dp->i_ino, | |
3031 | &first_block, &free_list, spaceres); | |
2451337d | 3032 | ASSERT(error != -EEXIST); |
f6bba201 | 3033 | if (error) |
4906e215 | 3034 | goto out_bmap_cancel; |
f6bba201 DC |
3035 | } |
3036 | ||
3037 | /* | |
3038 | * We always want to hit the ctime on the source inode. | |
3039 | * | |
3040 | * This isn't strictly required by the standards since the source | |
3041 | * inode isn't really being changed, but old unix file systems did | |
3042 | * it and some incremental backup programs won't work without it. | |
3043 | */ | |
3044 | xfs_trans_ichgtime(tp, src_ip, XFS_ICHGTIME_CHG); | |
3045 | xfs_trans_log_inode(tp, src_ip, XFS_ILOG_CORE); | |
3046 | ||
3047 | /* | |
3048 | * Adjust the link count on src_dp. This is necessary when | |
3049 | * renaming a directory, either within one parent when | |
3050 | * the target existed, or across two parent directories. | |
3051 | */ | |
3052 | if (src_is_directory && (new_parent || target_ip != NULL)) { | |
3053 | ||
3054 | /* | |
3055 | * Decrement link count on src_directory since the | |
3056 | * entry that's moved no longer points to it. | |
3057 | */ | |
3058 | error = xfs_droplink(tp, src_dp); | |
3059 | if (error) | |
4906e215 | 3060 | goto out_bmap_cancel; |
f6bba201 DC |
3061 | } |
3062 | ||
7dcf5c3e DC |
3063 | /* |
3064 | * For whiteouts, we only need to update the source dirent with the | |
3065 | * inode number of the whiteout inode rather than removing it | |
3066 | * altogether. | |
3067 | */ | |
3068 | if (wip) { | |
3069 | error = xfs_dir_replace(tp, src_dp, src_name, wip->i_ino, | |
f6bba201 | 3070 | &first_block, &free_list, spaceres); |
7dcf5c3e DC |
3071 | } else |
3072 | error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino, | |
3073 | &first_block, &free_list, spaceres); | |
f6bba201 | 3074 | if (error) |
4906e215 | 3075 | goto out_bmap_cancel; |
f6bba201 DC |
3076 | |
3077 | /* | |
7dcf5c3e DC |
3078 | * For whiteouts, we need to bump the link count on the whiteout inode. |
3079 | * This means that failures all the way up to this point leave the inode | |
3080 | * on the unlinked list and so cleanup is a simple matter of dropping | |
3081 | * the remaining reference to it. If we fail here after bumping the link | |
3082 | * count, we're shutting down the filesystem so we'll never see the | |
3083 | * intermediate state on disk. | |
f6bba201 | 3084 | */ |
7dcf5c3e | 3085 | if (wip) { |
22419ac9 | 3086 | ASSERT(VFS_I(wip)->i_nlink == 0 && wip->i_d.di_nlink == 0); |
7dcf5c3e DC |
3087 | error = xfs_bumplink(tp, wip); |
3088 | if (error) | |
4906e215 | 3089 | goto out_bmap_cancel; |
7dcf5c3e DC |
3090 | error = xfs_iunlink_remove(tp, wip); |
3091 | if (error) | |
4906e215 | 3092 | goto out_bmap_cancel; |
7dcf5c3e | 3093 | xfs_trans_log_inode(tp, wip, XFS_ILOG_CORE); |
f6bba201 | 3094 | |
7dcf5c3e DC |
3095 | /* |
3096 | * Now we have a real link, clear the "I'm a tmpfile" state | |
3097 | * flag from the inode so it doesn't accidentally get misused in | |
3098 | * future. | |
3099 | */ | |
3100 | VFS_I(wip)->i_state &= ~I_LINKABLE; | |
f6bba201 DC |
3101 | } |
3102 | ||
f6bba201 DC |
3103 | xfs_trans_ichgtime(tp, src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
3104 | xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE); | |
3105 | if (new_parent) | |
3106 | xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE); | |
f6bba201 | 3107 | |
7dcf5c3e DC |
3108 | error = xfs_finish_rename(tp, &free_list); |
3109 | if (wip) | |
3110 | IRELE(wip); | |
3111 | return error; | |
f6bba201 | 3112 | |
445883e8 | 3113 | out_bmap_cancel: |
f6bba201 | 3114 | xfs_bmap_cancel(&free_list); |
445883e8 | 3115 | out_trans_cancel: |
4906e215 | 3116 | xfs_trans_cancel(tp); |
7dcf5c3e DC |
3117 | if (wip) |
3118 | IRELE(wip); | |
f6bba201 DC |
3119 | return error; |
3120 | } | |
3121 | ||
5c4d97d0 DC |
3122 | STATIC int |
3123 | xfs_iflush_cluster( | |
3124 | xfs_inode_t *ip, | |
3125 | xfs_buf_t *bp) | |
1da177e4 | 3126 | { |
5c4d97d0 DC |
3127 | xfs_mount_t *mp = ip->i_mount; |
3128 | struct xfs_perag *pag; | |
3129 | unsigned long first_index, mask; | |
3130 | unsigned long inodes_per_cluster; | |
3131 | int ilist_size; | |
3132 | xfs_inode_t **ilist; | |
3133 | xfs_inode_t *iq; | |
3134 | int nr_found; | |
3135 | int clcount = 0; | |
3136 | int bufwasdelwri; | |
1da177e4 | 3137 | int i; |
1da177e4 | 3138 | |
5c4d97d0 | 3139 | pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino)); |
1da177e4 | 3140 | |
0f49efd8 | 3141 | inodes_per_cluster = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog; |
5c4d97d0 DC |
3142 | ilist_size = inodes_per_cluster * sizeof(xfs_inode_t *); |
3143 | ilist = kmem_alloc(ilist_size, KM_MAYFAIL|KM_NOFS); | |
3144 | if (!ilist) | |
3145 | goto out_put; | |
1da177e4 | 3146 | |
0f49efd8 | 3147 | mask = ~(((mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog)) - 1); |
5c4d97d0 DC |
3148 | first_index = XFS_INO_TO_AGINO(mp, ip->i_ino) & mask; |
3149 | rcu_read_lock(); | |
3150 | /* really need a gang lookup range call here */ | |
3151 | nr_found = radix_tree_gang_lookup(&pag->pag_ici_root, (void**)ilist, | |
3152 | first_index, inodes_per_cluster); | |
3153 | if (nr_found == 0) | |
3154 | goto out_free; | |
3155 | ||
3156 | for (i = 0; i < nr_found; i++) { | |
3157 | iq = ilist[i]; | |
3158 | if (iq == ip) | |
bad55843 | 3159 | continue; |
1a3e8f3d DC |
3160 | |
3161 | /* | |
3162 | * because this is an RCU protected lookup, we could find a | |
3163 | * recently freed or even reallocated inode during the lookup. | |
3164 | * We need to check under the i_flags_lock for a valid inode | |
3165 | * here. Skip it if it is not valid or the wrong inode. | |
3166 | */ | |
3167 | spin_lock(&ip->i_flags_lock); | |
3168 | if (!ip->i_ino || | |
3169 | (XFS_INO_TO_AGINO(mp, iq->i_ino) & mask) != first_index) { | |
3170 | spin_unlock(&ip->i_flags_lock); | |
3171 | continue; | |
3172 | } | |
3173 | spin_unlock(&ip->i_flags_lock); | |
3174 | ||
bad55843 DC |
3175 | /* |
3176 | * Do an un-protected check to see if the inode is dirty and | |
3177 | * is a candidate for flushing. These checks will be repeated | |
3178 | * later after the appropriate locks are acquired. | |
3179 | */ | |
33540408 | 3180 | if (xfs_inode_clean(iq) && xfs_ipincount(iq) == 0) |
bad55843 | 3181 | continue; |
bad55843 DC |
3182 | |
3183 | /* | |
3184 | * Try to get locks. If any are unavailable or it is pinned, | |
3185 | * then this inode cannot be flushed and is skipped. | |
3186 | */ | |
3187 | ||
3188 | if (!xfs_ilock_nowait(iq, XFS_ILOCK_SHARED)) | |
3189 | continue; | |
3190 | if (!xfs_iflock_nowait(iq)) { | |
3191 | xfs_iunlock(iq, XFS_ILOCK_SHARED); | |
3192 | continue; | |
3193 | } | |
3194 | if (xfs_ipincount(iq)) { | |
3195 | xfs_ifunlock(iq); | |
3196 | xfs_iunlock(iq, XFS_ILOCK_SHARED); | |
3197 | continue; | |
3198 | } | |
3199 | ||
3200 | /* | |
3201 | * arriving here means that this inode can be flushed. First | |
3202 | * re-check that it's dirty before flushing. | |
3203 | */ | |
33540408 DC |
3204 | if (!xfs_inode_clean(iq)) { |
3205 | int error; | |
bad55843 DC |
3206 | error = xfs_iflush_int(iq, bp); |
3207 | if (error) { | |
3208 | xfs_iunlock(iq, XFS_ILOCK_SHARED); | |
3209 | goto cluster_corrupt_out; | |
3210 | } | |
3211 | clcount++; | |
3212 | } else { | |
3213 | xfs_ifunlock(iq); | |
3214 | } | |
3215 | xfs_iunlock(iq, XFS_ILOCK_SHARED); | |
3216 | } | |
3217 | ||
3218 | if (clcount) { | |
3219 | XFS_STATS_INC(xs_icluster_flushcnt); | |
3220 | XFS_STATS_ADD(xs_icluster_flushinode, clcount); | |
3221 | } | |
3222 | ||
3223 | out_free: | |
1a3e8f3d | 3224 | rcu_read_unlock(); |
f0e2d93c | 3225 | kmem_free(ilist); |
44b56e0a DC |
3226 | out_put: |
3227 | xfs_perag_put(pag); | |
bad55843 DC |
3228 | return 0; |
3229 | ||
3230 | ||
3231 | cluster_corrupt_out: | |
3232 | /* | |
3233 | * Corruption detected in the clustering loop. Invalidate the | |
3234 | * inode buffer and shut down the filesystem. | |
3235 | */ | |
1a3e8f3d | 3236 | rcu_read_unlock(); |
bad55843 | 3237 | /* |
43ff2122 | 3238 | * Clean up the buffer. If it was delwri, just release it -- |
bad55843 DC |
3239 | * brelse can handle it with no problems. If not, shut down the |
3240 | * filesystem before releasing the buffer. | |
3241 | */ | |
43ff2122 | 3242 | bufwasdelwri = (bp->b_flags & _XBF_DELWRI_Q); |
bad55843 DC |
3243 | if (bufwasdelwri) |
3244 | xfs_buf_relse(bp); | |
3245 | ||
3246 | xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); | |
3247 | ||
3248 | if (!bufwasdelwri) { | |
3249 | /* | |
3250 | * Just like incore_relse: if we have b_iodone functions, | |
3251 | * mark the buffer as an error and call them. Otherwise | |
3252 | * mark it as stale and brelse. | |
3253 | */ | |
cb669ca5 | 3254 | if (bp->b_iodone) { |
bad55843 | 3255 | XFS_BUF_UNDONE(bp); |
c867cb61 | 3256 | xfs_buf_stale(bp); |
2451337d | 3257 | xfs_buf_ioerror(bp, -EIO); |
e8aaba9a | 3258 | xfs_buf_ioend(bp); |
bad55843 | 3259 | } else { |
c867cb61 | 3260 | xfs_buf_stale(bp); |
bad55843 DC |
3261 | xfs_buf_relse(bp); |
3262 | } | |
3263 | } | |
3264 | ||
3265 | /* | |
3266 | * Unlocks the flush lock | |
3267 | */ | |
04913fdd | 3268 | xfs_iflush_abort(iq, false); |
f0e2d93c | 3269 | kmem_free(ilist); |
44b56e0a | 3270 | xfs_perag_put(pag); |
2451337d | 3271 | return -EFSCORRUPTED; |
bad55843 DC |
3272 | } |
3273 | ||
1da177e4 | 3274 | /* |
4c46819a CH |
3275 | * Flush dirty inode metadata into the backing buffer. |
3276 | * | |
3277 | * The caller must have the inode lock and the inode flush lock held. The | |
3278 | * inode lock will still be held upon return to the caller, and the inode | |
3279 | * flush lock will be released after the inode has reached the disk. | |
3280 | * | |
3281 | * The caller must write out the buffer returned in *bpp and release it. | |
1da177e4 LT |
3282 | */ |
3283 | int | |
3284 | xfs_iflush( | |
4c46819a CH |
3285 | struct xfs_inode *ip, |
3286 | struct xfs_buf **bpp) | |
1da177e4 | 3287 | { |
4c46819a CH |
3288 | struct xfs_mount *mp = ip->i_mount; |
3289 | struct xfs_buf *bp; | |
3290 | struct xfs_dinode *dip; | |
1da177e4 | 3291 | int error; |
1da177e4 LT |
3292 | |
3293 | XFS_STATS_INC(xs_iflush_count); | |
3294 | ||
579aa9ca | 3295 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)); |
474fce06 | 3296 | ASSERT(xfs_isiflocked(ip)); |
1da177e4 | 3297 | ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || |
8096b1eb | 3298 | ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK)); |
1da177e4 | 3299 | |
4c46819a | 3300 | *bpp = NULL; |
1da177e4 | 3301 | |
1da177e4 LT |
3302 | xfs_iunpin_wait(ip); |
3303 | ||
4b6a4688 DC |
3304 | /* |
3305 | * For stale inodes we cannot rely on the backing buffer remaining | |
3306 | * stale in cache for the remaining life of the stale inode and so | |
475ee413 | 3307 | * xfs_imap_to_bp() below may give us a buffer that no longer contains |
4b6a4688 DC |
3308 | * inodes below. We have to check this after ensuring the inode is |
3309 | * unpinned so that it is safe to reclaim the stale inode after the | |
3310 | * flush call. | |
3311 | */ | |
3312 | if (xfs_iflags_test(ip, XFS_ISTALE)) { | |
3313 | xfs_ifunlock(ip); | |
3314 | return 0; | |
3315 | } | |
3316 | ||
1da177e4 LT |
3317 | /* |
3318 | * This may have been unpinned because the filesystem is shutting | |
3319 | * down forcibly. If that's the case we must not write this inode | |
32ce90a4 CH |
3320 | * to disk, because the log record didn't make it to disk. |
3321 | * | |
3322 | * We also have to remove the log item from the AIL in this case, | |
3323 | * as we wait for an empty AIL as part of the unmount process. | |
1da177e4 LT |
3324 | */ |
3325 | if (XFS_FORCED_SHUTDOWN(mp)) { | |
2451337d | 3326 | error = -EIO; |
32ce90a4 | 3327 | goto abort_out; |
1da177e4 LT |
3328 | } |
3329 | ||
a3f74ffb DC |
3330 | /* |
3331 | * Get the buffer containing the on-disk inode. | |
3332 | */ | |
475ee413 CH |
3333 | error = xfs_imap_to_bp(mp, NULL, &ip->i_imap, &dip, &bp, XBF_TRYLOCK, |
3334 | 0); | |
a3f74ffb DC |
3335 | if (error || !bp) { |
3336 | xfs_ifunlock(ip); | |
3337 | return error; | |
3338 | } | |
3339 | ||
1da177e4 LT |
3340 | /* |
3341 | * First flush out the inode that xfs_iflush was called with. | |
3342 | */ | |
3343 | error = xfs_iflush_int(ip, bp); | |
bad55843 | 3344 | if (error) |
1da177e4 | 3345 | goto corrupt_out; |
1da177e4 | 3346 | |
a3f74ffb DC |
3347 | /* |
3348 | * If the buffer is pinned then push on the log now so we won't | |
3349 | * get stuck waiting in the write for too long. | |
3350 | */ | |
811e64c7 | 3351 | if (xfs_buf_ispinned(bp)) |
a14a348b | 3352 | xfs_log_force(mp, 0); |
a3f74ffb | 3353 | |
1da177e4 LT |
3354 | /* |
3355 | * inode clustering: | |
3356 | * see if other inodes can be gathered into this write | |
3357 | */ | |
bad55843 DC |
3358 | error = xfs_iflush_cluster(ip, bp); |
3359 | if (error) | |
3360 | goto cluster_corrupt_out; | |
1da177e4 | 3361 | |
4c46819a CH |
3362 | *bpp = bp; |
3363 | return 0; | |
1da177e4 LT |
3364 | |
3365 | corrupt_out: | |
3366 | xfs_buf_relse(bp); | |
7d04a335 | 3367 | xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); |
1da177e4 | 3368 | cluster_corrupt_out: |
2451337d | 3369 | error = -EFSCORRUPTED; |
32ce90a4 | 3370 | abort_out: |
1da177e4 LT |
3371 | /* |
3372 | * Unlocks the flush lock | |
3373 | */ | |
04913fdd | 3374 | xfs_iflush_abort(ip, false); |
32ce90a4 | 3375 | return error; |
1da177e4 LT |
3376 | } |
3377 | ||
1da177e4 LT |
3378 | STATIC int |
3379 | xfs_iflush_int( | |
93848a99 CH |
3380 | struct xfs_inode *ip, |
3381 | struct xfs_buf *bp) | |
1da177e4 | 3382 | { |
93848a99 CH |
3383 | struct xfs_inode_log_item *iip = ip->i_itemp; |
3384 | struct xfs_dinode *dip; | |
3385 | struct xfs_mount *mp = ip->i_mount; | |
1da177e4 | 3386 | |
579aa9ca | 3387 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)); |
474fce06 | 3388 | ASSERT(xfs_isiflocked(ip)); |
1da177e4 | 3389 | ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || |
8096b1eb | 3390 | ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK)); |
93848a99 | 3391 | ASSERT(iip != NULL && iip->ili_fields != 0); |
263997a6 | 3392 | ASSERT(ip->i_d.di_version > 1); |
1da177e4 | 3393 | |
1da177e4 | 3394 | /* set *dip = inode's place in the buffer */ |
88ee2df7 | 3395 | dip = xfs_buf_offset(bp, ip->i_imap.im_boffset); |
1da177e4 | 3396 | |
69ef921b | 3397 | if (XFS_TEST_ERROR(dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC), |
1da177e4 | 3398 | mp, XFS_ERRTAG_IFLUSH_1, XFS_RANDOM_IFLUSH_1)) { |
6a19d939 DC |
3399 | xfs_alert_tag(mp, XFS_PTAG_IFLUSH, |
3400 | "%s: Bad inode %Lu magic number 0x%x, ptr 0x%p", | |
3401 | __func__, ip->i_ino, be16_to_cpu(dip->di_magic), dip); | |
1da177e4 LT |
3402 | goto corrupt_out; |
3403 | } | |
3404 | if (XFS_TEST_ERROR(ip->i_d.di_magic != XFS_DINODE_MAGIC, | |
3405 | mp, XFS_ERRTAG_IFLUSH_2, XFS_RANDOM_IFLUSH_2)) { | |
6a19d939 DC |
3406 | xfs_alert_tag(mp, XFS_PTAG_IFLUSH, |
3407 | "%s: Bad inode %Lu, ptr 0x%p, magic number 0x%x", | |
3408 | __func__, ip->i_ino, ip, ip->i_d.di_magic); | |
1da177e4 LT |
3409 | goto corrupt_out; |
3410 | } | |
abbede1b | 3411 | if (S_ISREG(ip->i_d.di_mode)) { |
1da177e4 LT |
3412 | if (XFS_TEST_ERROR( |
3413 | (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) && | |
3414 | (ip->i_d.di_format != XFS_DINODE_FMT_BTREE), | |
3415 | mp, XFS_ERRTAG_IFLUSH_3, XFS_RANDOM_IFLUSH_3)) { | |
6a19d939 DC |
3416 | xfs_alert_tag(mp, XFS_PTAG_IFLUSH, |
3417 | "%s: Bad regular inode %Lu, ptr 0x%p", | |
3418 | __func__, ip->i_ino, ip); | |
1da177e4 LT |
3419 | goto corrupt_out; |
3420 | } | |
abbede1b | 3421 | } else if (S_ISDIR(ip->i_d.di_mode)) { |
1da177e4 LT |
3422 | if (XFS_TEST_ERROR( |
3423 | (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) && | |
3424 | (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) && | |
3425 | (ip->i_d.di_format != XFS_DINODE_FMT_LOCAL), | |
3426 | mp, XFS_ERRTAG_IFLUSH_4, XFS_RANDOM_IFLUSH_4)) { | |
6a19d939 DC |
3427 | xfs_alert_tag(mp, XFS_PTAG_IFLUSH, |
3428 | "%s: Bad directory inode %Lu, ptr 0x%p", | |
3429 | __func__, ip->i_ino, ip); | |
1da177e4 LT |
3430 | goto corrupt_out; |
3431 | } | |
3432 | } | |
3433 | if (XFS_TEST_ERROR(ip->i_d.di_nextents + ip->i_d.di_anextents > | |
3434 | ip->i_d.di_nblocks, mp, XFS_ERRTAG_IFLUSH_5, | |
3435 | XFS_RANDOM_IFLUSH_5)) { | |
6a19d939 DC |
3436 | xfs_alert_tag(mp, XFS_PTAG_IFLUSH, |
3437 | "%s: detected corrupt incore inode %Lu, " | |
3438 | "total extents = %d, nblocks = %Ld, ptr 0x%p", | |
3439 | __func__, ip->i_ino, | |
1da177e4 | 3440 | ip->i_d.di_nextents + ip->i_d.di_anextents, |
6a19d939 | 3441 | ip->i_d.di_nblocks, ip); |
1da177e4 LT |
3442 | goto corrupt_out; |
3443 | } | |
3444 | if (XFS_TEST_ERROR(ip->i_d.di_forkoff > mp->m_sb.sb_inodesize, | |
3445 | mp, XFS_ERRTAG_IFLUSH_6, XFS_RANDOM_IFLUSH_6)) { | |
6a19d939 DC |
3446 | xfs_alert_tag(mp, XFS_PTAG_IFLUSH, |
3447 | "%s: bad inode %Lu, forkoff 0x%x, ptr 0x%p", | |
3448 | __func__, ip->i_ino, ip->i_d.di_forkoff, ip); | |
1da177e4 LT |
3449 | goto corrupt_out; |
3450 | } | |
e60896d8 | 3451 | |
1da177e4 | 3452 | /* |
263997a6 | 3453 | * Inode item log recovery for v2 inodes are dependent on the |
e60896d8 DC |
3454 | * di_flushiter count for correct sequencing. We bump the flush |
3455 | * iteration count so we can detect flushes which postdate a log record | |
3456 | * during recovery. This is redundant as we now log every change and | |
3457 | * hence this can't happen but we need to still do it to ensure | |
3458 | * backwards compatibility with old kernels that predate logging all | |
3459 | * inode changes. | |
1da177e4 | 3460 | */ |
e60896d8 DC |
3461 | if (ip->i_d.di_version < 3) |
3462 | ip->i_d.di_flushiter++; | |
1da177e4 LT |
3463 | |
3464 | /* | |
3465 | * Copy the dirty parts of the inode into the on-disk | |
3466 | * inode. We always copy out the core of the inode, | |
3467 | * because if the inode is dirty at all the core must | |
3468 | * be. | |
3469 | */ | |
81591fe2 | 3470 | xfs_dinode_to_disk(dip, &ip->i_d); |
1da177e4 LT |
3471 | |
3472 | /* Wrap, we never let the log put out DI_MAX_FLUSH */ | |
3473 | if (ip->i_d.di_flushiter == DI_MAX_FLUSH) | |
3474 | ip->i_d.di_flushiter = 0; | |
3475 | ||
fd9fdba6 | 3476 | xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK); |
e4ac967b | 3477 | if (XFS_IFORK_Q(ip)) |
fd9fdba6 | 3478 | xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK); |
1da177e4 LT |
3479 | xfs_inobp_check(mp, bp); |
3480 | ||
3481 | /* | |
f5d8d5c4 CH |
3482 | * We've recorded everything logged in the inode, so we'd like to clear |
3483 | * the ili_fields bits so we don't log and flush things unnecessarily. | |
3484 | * However, we can't stop logging all this information until the data | |
3485 | * we've copied into the disk buffer is written to disk. If we did we | |
3486 | * might overwrite the copy of the inode in the log with all the data | |
3487 | * after re-logging only part of it, and in the face of a crash we | |
3488 | * wouldn't have all the data we need to recover. | |
1da177e4 | 3489 | * |
f5d8d5c4 CH |
3490 | * What we do is move the bits to the ili_last_fields field. When |
3491 | * logging the inode, these bits are moved back to the ili_fields field. | |
3492 | * In the xfs_iflush_done() routine we clear ili_last_fields, since we | |
3493 | * know that the information those bits represent is permanently on | |
3494 | * disk. As long as the flush completes before the inode is logged | |
3495 | * again, then both ili_fields and ili_last_fields will be cleared. | |
1da177e4 | 3496 | * |
f5d8d5c4 CH |
3497 | * We can play with the ili_fields bits here, because the inode lock |
3498 | * must be held exclusively in order to set bits there and the flush | |
3499 | * lock protects the ili_last_fields bits. Set ili_logged so the flush | |
3500 | * done routine can tell whether or not to look in the AIL. Also, store | |
3501 | * the current LSN of the inode so that we can tell whether the item has | |
3502 | * moved in the AIL from xfs_iflush_done(). In order to read the lsn we | |
3503 | * need the AIL lock, because it is a 64 bit value that cannot be read | |
3504 | * atomically. | |
1da177e4 | 3505 | */ |
93848a99 CH |
3506 | iip->ili_last_fields = iip->ili_fields; |
3507 | iip->ili_fields = 0; | |
3508 | iip->ili_logged = 1; | |
1da177e4 | 3509 | |
93848a99 CH |
3510 | xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn, |
3511 | &iip->ili_item.li_lsn); | |
1da177e4 | 3512 | |
93848a99 CH |
3513 | /* |
3514 | * Attach the function xfs_iflush_done to the inode's | |
3515 | * buffer. This will remove the inode from the AIL | |
3516 | * and unlock the inode's flush lock when the inode is | |
3517 | * completely written to disk. | |
3518 | */ | |
3519 | xfs_buf_attach_iodone(bp, xfs_iflush_done, &iip->ili_item); | |
1da177e4 | 3520 | |
93848a99 CH |
3521 | /* update the lsn in the on disk inode if required */ |
3522 | if (ip->i_d.di_version == 3) | |
3523 | dip->di_lsn = cpu_to_be64(iip->ili_item.li_lsn); | |
3524 | ||
3525 | /* generate the checksum. */ | |
3526 | xfs_dinode_calc_crc(mp, dip); | |
1da177e4 | 3527 | |
93848a99 CH |
3528 | ASSERT(bp->b_fspriv != NULL); |
3529 | ASSERT(bp->b_iodone != NULL); | |
1da177e4 LT |
3530 | return 0; |
3531 | ||
3532 | corrupt_out: | |
2451337d | 3533 | return -EFSCORRUPTED; |
1da177e4 | 3534 | } |