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1/*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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
7 * published by the Free Software Foundation.
8 *
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.
13 *
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
17 */
18#include <linux/log2.h>
19#include <linux/iversion.h>
20
21#include "xfs.h"
22#include "xfs_fs.h"
23#include "xfs_shared.h"
24#include "xfs_format.h"
25#include "xfs_log_format.h"
26#include "xfs_trans_resv.h"
27#include "xfs_sb.h"
28#include "xfs_mount.h"
29#include "xfs_defer.h"
30#include "xfs_inode.h"
31#include "xfs_da_format.h"
32#include "xfs_da_btree.h"
33#include "xfs_dir2.h"
34#include "xfs_attr_sf.h"
35#include "xfs_attr.h"
36#include "xfs_trans_space.h"
37#include "xfs_trans.h"
38#include "xfs_buf_item.h"
39#include "xfs_inode_item.h"
40#include "xfs_ialloc.h"
41#include "xfs_bmap.h"
42#include "xfs_bmap_util.h"
43#include "xfs_errortag.h"
44#include "xfs_error.h"
45#include "xfs_quota.h"
46#include "xfs_filestream.h"
47#include "xfs_cksum.h"
48#include "xfs_trace.h"
49#include "xfs_icache.h"
50#include "xfs_symlink.h"
51#include "xfs_trans_priv.h"
52#include "xfs_log.h"
53#include "xfs_bmap_btree.h"
54#include "xfs_reflink.h"
55#include "xfs_dir2_priv.h"
56
57kmem_zone_t *xfs_inode_zone;
58
59/*
60 * Used in xfs_itruncate_extents(). This is the maximum number of extents
61 * freed from a file in a single transaction.
62 */
63#define XFS_ITRUNC_MAX_EXTENTS 2
64
65STATIC int xfs_iflush_int(struct xfs_inode *, struct xfs_buf *);
66STATIC int xfs_iunlink(struct xfs_trans *, struct xfs_inode *);
67STATIC int xfs_iunlink_remove(struct xfs_trans *, struct xfs_inode *);
68
69/*
70 * helper function to extract extent size hint from inode
71 */
72xfs_extlen_t
73xfs_get_extsz_hint(
74 struct xfs_inode *ip)
75{
76 if ((ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE) && ip->i_d.di_extsize)
77 return ip->i_d.di_extsize;
78 if (XFS_IS_REALTIME_INODE(ip))
79 return ip->i_mount->m_sb.sb_rextsize;
80 return 0;
81}
82
83/*
84 * Helper function to extract CoW extent size hint from inode.
85 * Between the extent size hint and the CoW extent size hint, we
86 * return the greater of the two. If the value is zero (automatic),
87 * use the default size.
88 */
89xfs_extlen_t
90xfs_get_cowextsz_hint(
91 struct xfs_inode *ip)
92{
93 xfs_extlen_t a, b;
94
95 a = 0;
96 if (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE)
97 a = ip->i_d.di_cowextsize;
98 b = xfs_get_extsz_hint(ip);
99
100 a = max(a, b);
101 if (a == 0)
102 return XFS_DEFAULT_COWEXTSZ_HINT;
103 return a;
104}
105
106/*
107 * These two are wrapper routines around the xfs_ilock() routine used to
108 * centralize some grungy code. They are used in places that wish to lock the
109 * inode solely for reading the extents. The reason these places can't just
110 * call xfs_ilock(ip, XFS_ILOCK_SHARED) is that the inode lock also guards to
111 * bringing in of the extents from disk for a file in b-tree format. If the
112 * inode is in b-tree format, then we need to lock the inode exclusively until
113 * the extents are read in. Locking it exclusively all the time would limit
114 * our parallelism unnecessarily, though. What we do instead is check to see
115 * if the extents have been read in yet, and only lock the inode exclusively
116 * if they have not.
117 *
118 * The functions return a value which should be given to the corresponding
119 * xfs_iunlock() call.
120 */
121uint
122xfs_ilock_data_map_shared(
123 struct xfs_inode *ip)
124{
125 uint lock_mode = XFS_ILOCK_SHARED;
126
127 if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE &&
128 (ip->i_df.if_flags & XFS_IFEXTENTS) == 0)
129 lock_mode = XFS_ILOCK_EXCL;
130 xfs_ilock(ip, lock_mode);
131 return lock_mode;
132}
133
134uint
135xfs_ilock_attr_map_shared(
136 struct xfs_inode *ip)
137{
138 uint lock_mode = XFS_ILOCK_SHARED;
139
140 if (ip->i_d.di_aformat == XFS_DINODE_FMT_BTREE &&
141 (ip->i_afp->if_flags & XFS_IFEXTENTS) == 0)
142 lock_mode = XFS_ILOCK_EXCL;
143 xfs_ilock(ip, lock_mode);
144 return lock_mode;
145}
146
147/*
148 * In addition to i_rwsem in the VFS inode, the xfs inode contains 2
149 * multi-reader locks: i_mmap_lock and the i_lock. This routine allows
150 * various combinations of the locks to be obtained.
151 *
152 * The 3 locks should always be ordered so that the IO lock is obtained first,
153 * the mmap lock second and the ilock last in order to prevent deadlock.
154 *
155 * Basic locking order:
156 *
157 * i_rwsem -> i_mmap_lock -> page_lock -> i_ilock
158 *
159 * mmap_sem locking order:
160 *
161 * i_rwsem -> page lock -> mmap_sem
162 * mmap_sem -> i_mmap_lock -> page_lock
163 *
164 * The difference in mmap_sem locking order mean that we cannot hold the
165 * i_mmap_lock over syscall based read(2)/write(2) based IO. These IO paths can
166 * fault in pages during copy in/out (for buffered IO) or require the mmap_sem
167 * in get_user_pages() to map the user pages into the kernel address space for
168 * direct IO. Similarly the i_rwsem cannot be taken inside a page fault because
169 * page faults already hold the mmap_sem.
170 *
171 * Hence to serialise fully against both syscall and mmap based IO, we need to
172 * take both the i_rwsem and the i_mmap_lock. These locks should *only* be both
173 * taken in places where we need to invalidate the page cache in a race
174 * free manner (e.g. truncate, hole punch and other extent manipulation
175 * functions).
176 */
177void
178xfs_ilock(
179 xfs_inode_t *ip,
180 uint lock_flags)
181{
182 trace_xfs_ilock(ip, lock_flags, _RET_IP_);
183
184 /*
185 * You can't set both SHARED and EXCL for the same lock,
186 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
187 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
188 */
189 ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
190 (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
191 ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
192 (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
193 ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
194 (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
195 ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);
196
197 if (lock_flags & XFS_IOLOCK_EXCL) {
198 down_write_nested(&VFS_I(ip)->i_rwsem,
199 XFS_IOLOCK_DEP(lock_flags));
200 } else if (lock_flags & XFS_IOLOCK_SHARED) {
201 down_read_nested(&VFS_I(ip)->i_rwsem,
202 XFS_IOLOCK_DEP(lock_flags));
203 }
204
205 if (lock_flags & XFS_MMAPLOCK_EXCL)
206 mrupdate_nested(&ip->i_mmaplock, XFS_MMAPLOCK_DEP(lock_flags));
207 else if (lock_flags & XFS_MMAPLOCK_SHARED)
208 mraccess_nested(&ip->i_mmaplock, XFS_MMAPLOCK_DEP(lock_flags));
209
210 if (lock_flags & XFS_ILOCK_EXCL)
211 mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
212 else if (lock_flags & XFS_ILOCK_SHARED)
213 mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
214}
215
216/*
217 * This is just like xfs_ilock(), except that the caller
218 * is guaranteed not to sleep. It returns 1 if it gets
219 * the requested locks and 0 otherwise. If the IO lock is
220 * obtained but the inode lock cannot be, then the IO lock
221 * is dropped before returning.
222 *
223 * ip -- the inode being locked
224 * lock_flags -- this parameter indicates the inode's locks to be
225 * to be locked. See the comment for xfs_ilock() for a list
226 * of valid values.
227 */
228int
229xfs_ilock_nowait(
230 xfs_inode_t *ip,
231 uint lock_flags)
232{
233 trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_);
234
235 /*
236 * You can't set both SHARED and EXCL for the same lock,
237 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
238 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
239 */
240 ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
241 (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
242 ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
243 (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
244 ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
245 (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
246 ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);
247
248 if (lock_flags & XFS_IOLOCK_EXCL) {
249 if (!down_write_trylock(&VFS_I(ip)->i_rwsem))
250 goto out;
251 } else if (lock_flags & XFS_IOLOCK_SHARED) {
252 if (!down_read_trylock(&VFS_I(ip)->i_rwsem))
253 goto out;
254 }
255
256 if (lock_flags & XFS_MMAPLOCK_EXCL) {
257 if (!mrtryupdate(&ip->i_mmaplock))
258 goto out_undo_iolock;
259 } else if (lock_flags & XFS_MMAPLOCK_SHARED) {
260 if (!mrtryaccess(&ip->i_mmaplock))
261 goto out_undo_iolock;
262 }
263
264 if (lock_flags & XFS_ILOCK_EXCL) {
265 if (!mrtryupdate(&ip->i_lock))
266 goto out_undo_mmaplock;
267 } else if (lock_flags & XFS_ILOCK_SHARED) {
268 if (!mrtryaccess(&ip->i_lock))
269 goto out_undo_mmaplock;
270 }
271 return 1;
272
273out_undo_mmaplock:
274 if (lock_flags & XFS_MMAPLOCK_EXCL)
275 mrunlock_excl(&ip->i_mmaplock);
276 else if (lock_flags & XFS_MMAPLOCK_SHARED)
277 mrunlock_shared(&ip->i_mmaplock);
278out_undo_iolock:
279 if (lock_flags & XFS_IOLOCK_EXCL)
280 up_write(&VFS_I(ip)->i_rwsem);
281 else if (lock_flags & XFS_IOLOCK_SHARED)
282 up_read(&VFS_I(ip)->i_rwsem);
283out:
284 return 0;
285}
286
287/*
288 * xfs_iunlock() is used to drop the inode locks acquired with
289 * xfs_ilock() and xfs_ilock_nowait(). The caller must pass
290 * in the flags given to xfs_ilock() or xfs_ilock_nowait() so
291 * that we know which locks to drop.
292 *
293 * ip -- the inode being unlocked
294 * lock_flags -- this parameter indicates the inode's locks to be
295 * to be unlocked. See the comment for xfs_ilock() for a list
296 * of valid values for this parameter.
297 *
298 */
299void
300xfs_iunlock(
301 xfs_inode_t *ip,
302 uint lock_flags)
303{
304 /*
305 * You can't set both SHARED and EXCL for the same lock,
306 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
307 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
308 */
309 ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
310 (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
311 ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
312 (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
313 ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
314 (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
315 ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);
316 ASSERT(lock_flags != 0);
317
318 if (lock_flags & XFS_IOLOCK_EXCL)
319 up_write(&VFS_I(ip)->i_rwsem);
320 else if (lock_flags & XFS_IOLOCK_SHARED)
321 up_read(&VFS_I(ip)->i_rwsem);
322
323 if (lock_flags & XFS_MMAPLOCK_EXCL)
324 mrunlock_excl(&ip->i_mmaplock);
325 else if (lock_flags & XFS_MMAPLOCK_SHARED)
326 mrunlock_shared(&ip->i_mmaplock);
327
328 if (lock_flags & XFS_ILOCK_EXCL)
329 mrunlock_excl(&ip->i_lock);
330 else if (lock_flags & XFS_ILOCK_SHARED)
331 mrunlock_shared(&ip->i_lock);
332
333 trace_xfs_iunlock(ip, lock_flags, _RET_IP_);
334}
335
336/*
337 * give up write locks. the i/o lock cannot be held nested
338 * if it is being demoted.
339 */
340void
341xfs_ilock_demote(
342 xfs_inode_t *ip,
343 uint lock_flags)
344{
345 ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_MMAPLOCK_EXCL|XFS_ILOCK_EXCL));
346 ASSERT((lock_flags &
347 ~(XFS_IOLOCK_EXCL|XFS_MMAPLOCK_EXCL|XFS_ILOCK_EXCL)) == 0);
348
349 if (lock_flags & XFS_ILOCK_EXCL)
350 mrdemote(&ip->i_lock);
351 if (lock_flags & XFS_MMAPLOCK_EXCL)
352 mrdemote(&ip->i_mmaplock);
353 if (lock_flags & XFS_IOLOCK_EXCL)
354 downgrade_write(&VFS_I(ip)->i_rwsem);
355
356 trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_);
357}
358
359#if defined(DEBUG) || defined(XFS_WARN)
360int
361xfs_isilocked(
362 xfs_inode_t *ip,
363 uint lock_flags)
364{
365 if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
366 if (!(lock_flags & XFS_ILOCK_SHARED))
367 return !!ip->i_lock.mr_writer;
368 return rwsem_is_locked(&ip->i_lock.mr_lock);
369 }
370
371 if (lock_flags & (XFS_MMAPLOCK_EXCL|XFS_MMAPLOCK_SHARED)) {
372 if (!(lock_flags & XFS_MMAPLOCK_SHARED))
373 return !!ip->i_mmaplock.mr_writer;
374 return rwsem_is_locked(&ip->i_mmaplock.mr_lock);
375 }
376
377 if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
378 if (!(lock_flags & XFS_IOLOCK_SHARED))
379 return !debug_locks ||
380 lockdep_is_held_type(&VFS_I(ip)->i_rwsem, 0);
381 return rwsem_is_locked(&VFS_I(ip)->i_rwsem);
382 }
383
384 ASSERT(0);
385 return 0;
386}
387#endif
388
389/*
390 * xfs_lockdep_subclass_ok() is only used in an ASSERT, so is only called when
391 * DEBUG or XFS_WARN is set. And MAX_LOCKDEP_SUBCLASSES is then only defined
392 * when CONFIG_LOCKDEP is set. Hence the complex define below to avoid build
393 * errors and warnings.
394 */
395#if (defined(DEBUG) || defined(XFS_WARN)) && defined(CONFIG_LOCKDEP)
396static bool
397xfs_lockdep_subclass_ok(
398 int subclass)
399{
400 return subclass < MAX_LOCKDEP_SUBCLASSES;
401}
402#else
403#define xfs_lockdep_subclass_ok(subclass) (true)
404#endif
405
406/*
407 * Bump the subclass so xfs_lock_inodes() acquires each lock with a different
408 * value. This can be called for any type of inode lock combination, including
409 * parent locking. Care must be taken to ensure we don't overrun the subclass
410 * storage fields in the class mask we build.
411 */
412static inline int
413xfs_lock_inumorder(int lock_mode, int subclass)
414{
415 int class = 0;
416
417 ASSERT(!(lock_mode & (XFS_ILOCK_PARENT | XFS_ILOCK_RTBITMAP |
418 XFS_ILOCK_RTSUM)));
419 ASSERT(xfs_lockdep_subclass_ok(subclass));
420
421 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) {
422 ASSERT(subclass <= XFS_IOLOCK_MAX_SUBCLASS);
423 class += subclass << XFS_IOLOCK_SHIFT;
424 }
425
426 if (lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) {
427 ASSERT(subclass <= XFS_MMAPLOCK_MAX_SUBCLASS);
428 class += subclass << XFS_MMAPLOCK_SHIFT;
429 }
430
431 if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) {
432 ASSERT(subclass <= XFS_ILOCK_MAX_SUBCLASS);
433 class += subclass << XFS_ILOCK_SHIFT;
434 }
435
436 return (lock_mode & ~XFS_LOCK_SUBCLASS_MASK) | class;
437}
438
439/*
440 * The following routine will lock n inodes in exclusive mode. We assume the
441 * caller calls us with the inodes in i_ino order.
442 *
443 * We need to detect deadlock where an inode that we lock is in the AIL and we
444 * start waiting for another inode that is locked by a thread in a long running
445 * transaction (such as truncate). This can result in deadlock since the long
446 * running trans might need to wait for the inode we just locked in order to
447 * push the tail and free space in the log.
448 *
449 * xfs_lock_inodes() can only be used to lock one type of lock at a time -
450 * the iolock, the mmaplock or the ilock, but not more than one at a time. If we
451 * lock more than one at a time, lockdep will report false positives saying we
452 * have violated locking orders.
453 */
454static void
455xfs_lock_inodes(
456 xfs_inode_t **ips,
457 int inodes,
458 uint lock_mode)
459{
460 int attempts = 0, i, j, try_lock;
461 xfs_log_item_t *lp;
462
463 /*
464 * Currently supports between 2 and 5 inodes with exclusive locking. We
465 * support an arbitrary depth of locking here, but absolute limits on
466 * inodes depend on the the type of locking and the limits placed by
467 * lockdep annotations in xfs_lock_inumorder. These are all checked by
468 * the asserts.
469 */
470 ASSERT(ips && inodes >= 2 && inodes <= 5);
471 ASSERT(lock_mode & (XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL |
472 XFS_ILOCK_EXCL));
473 ASSERT(!(lock_mode & (XFS_IOLOCK_SHARED | XFS_MMAPLOCK_SHARED |
474 XFS_ILOCK_SHARED)));
475 ASSERT(!(lock_mode & XFS_MMAPLOCK_EXCL) ||
476 inodes <= XFS_MMAPLOCK_MAX_SUBCLASS + 1);
477 ASSERT(!(lock_mode & XFS_ILOCK_EXCL) ||
478 inodes <= XFS_ILOCK_MAX_SUBCLASS + 1);
479
480 if (lock_mode & XFS_IOLOCK_EXCL) {
481 ASSERT(!(lock_mode & (XFS_MMAPLOCK_EXCL | XFS_ILOCK_EXCL)));
482 } else if (lock_mode & XFS_MMAPLOCK_EXCL)
483 ASSERT(!(lock_mode & XFS_ILOCK_EXCL));
484
485 try_lock = 0;
486 i = 0;
487again:
488 for (; i < inodes; i++) {
489 ASSERT(ips[i]);
490
491 if (i && (ips[i] == ips[i - 1])) /* Already locked */
492 continue;
493
494 /*
495 * If try_lock is not set yet, make sure all locked inodes are
496 * not in the AIL. If any are, set try_lock to be used later.
497 */
498 if (!try_lock) {
499 for (j = (i - 1); j >= 0 && !try_lock; j--) {
500 lp = (xfs_log_item_t *)ips[j]->i_itemp;
501 if (lp && (lp->li_flags & XFS_LI_IN_AIL))
502 try_lock++;
503 }
504 }
505
506 /*
507 * If any of the previous locks we have locked is in the AIL,
508 * we must TRY to get the second and subsequent locks. If
509 * we can't get any, we must release all we have
510 * and try again.
511 */
512 if (!try_lock) {
513 xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
514 continue;
515 }
516
517 /* try_lock means we have an inode locked that is in the AIL. */
518 ASSERT(i != 0);
519 if (xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i)))
520 continue;
521
522 /*
523 * Unlock all previous guys and try again. xfs_iunlock will try
524 * to push the tail if the inode is in the AIL.
525 */
526 attempts++;
527 for (j = i - 1; j >= 0; j--) {
528 /*
529 * Check to see if we've already unlocked this one. Not
530 * the first one going back, and the inode ptr is the
531 * same.
532 */
533 if (j != (i - 1) && ips[j] == ips[j + 1])
534 continue;
535
536 xfs_iunlock(ips[j], lock_mode);
537 }
538
539 if ((attempts % 5) == 0) {
540 delay(1); /* Don't just spin the CPU */
541 }
542 i = 0;
543 try_lock = 0;
544 goto again;
545 }
546}
547
548/*
549 * xfs_lock_two_inodes() can only be used to lock one type of lock at a time -
550 * the mmaplock or the ilock, but not more than one type at a time. If we lock
551 * more than one at a time, lockdep will report false positives saying we have
552 * violated locking orders. The iolock must be double-locked separately since
553 * we use i_rwsem for that. We now support taking one lock EXCL and the other
554 * SHARED.
555 */
556void
557xfs_lock_two_inodes(
558 struct xfs_inode *ip0,
559 uint ip0_mode,
560 struct xfs_inode *ip1,
561 uint ip1_mode)
562{
563 struct xfs_inode *temp;
564 uint mode_temp;
565 int attempts = 0;
566 xfs_log_item_t *lp;
567
568 ASSERT(hweight32(ip0_mode) == 1);
569 ASSERT(hweight32(ip1_mode) == 1);
570 ASSERT(!(ip0_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)));
571 ASSERT(!(ip1_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)));
572 ASSERT(!(ip0_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
573 !(ip0_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
574 ASSERT(!(ip1_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
575 !(ip1_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
576 ASSERT(!(ip1_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
577 !(ip0_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
578 ASSERT(!(ip0_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
579 !(ip1_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
580
581 ASSERT(ip0->i_ino != ip1->i_ino);
582
583 if (ip0->i_ino > ip1->i_ino) {
584 temp = ip0;
585 ip0 = ip1;
586 ip1 = temp;
587 mode_temp = ip0_mode;
588 ip0_mode = ip1_mode;
589 ip1_mode = mode_temp;
590 }
591
592 again:
593 xfs_ilock(ip0, xfs_lock_inumorder(ip0_mode, 0));
594
595 /*
596 * If the first lock we have locked is in the AIL, we must TRY to get
597 * the second lock. If we can't get it, we must release the first one
598 * and try again.
599 */
600 lp = (xfs_log_item_t *)ip0->i_itemp;
601 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
602 if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(ip1_mode, 1))) {
603 xfs_iunlock(ip0, ip0_mode);
604 if ((++attempts % 5) == 0)
605 delay(1); /* Don't just spin the CPU */
606 goto again;
607 }
608 } else {
609 xfs_ilock(ip1, xfs_lock_inumorder(ip1_mode, 1));
610 }
611}
612
613void
614__xfs_iflock(
615 struct xfs_inode *ip)
616{
617 wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IFLOCK_BIT);
618 DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IFLOCK_BIT);
619
620 do {
621 prepare_to_wait_exclusive(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
622 if (xfs_isiflocked(ip))
623 io_schedule();
624 } while (!xfs_iflock_nowait(ip));
625
626 finish_wait(wq, &wait.wq_entry);
627}
628
629STATIC uint
630_xfs_dic2xflags(
631 uint16_t di_flags,
632 uint64_t di_flags2,
633 bool has_attr)
634{
635 uint flags = 0;
636
637 if (di_flags & XFS_DIFLAG_ANY) {
638 if (di_flags & XFS_DIFLAG_REALTIME)
639 flags |= FS_XFLAG_REALTIME;
640 if (di_flags & XFS_DIFLAG_PREALLOC)
641 flags |= FS_XFLAG_PREALLOC;
642 if (di_flags & XFS_DIFLAG_IMMUTABLE)
643 flags |= FS_XFLAG_IMMUTABLE;
644 if (di_flags & XFS_DIFLAG_APPEND)
645 flags |= FS_XFLAG_APPEND;
646 if (di_flags & XFS_DIFLAG_SYNC)
647 flags |= FS_XFLAG_SYNC;
648 if (di_flags & XFS_DIFLAG_NOATIME)
649 flags |= FS_XFLAG_NOATIME;
650 if (di_flags & XFS_DIFLAG_NODUMP)
651 flags |= FS_XFLAG_NODUMP;
652 if (di_flags & XFS_DIFLAG_RTINHERIT)
653 flags |= FS_XFLAG_RTINHERIT;
654 if (di_flags & XFS_DIFLAG_PROJINHERIT)
655 flags |= FS_XFLAG_PROJINHERIT;
656 if (di_flags & XFS_DIFLAG_NOSYMLINKS)
657 flags |= FS_XFLAG_NOSYMLINKS;
658 if (di_flags & XFS_DIFLAG_EXTSIZE)
659 flags |= FS_XFLAG_EXTSIZE;
660 if (di_flags & XFS_DIFLAG_EXTSZINHERIT)
661 flags |= FS_XFLAG_EXTSZINHERIT;
662 if (di_flags & XFS_DIFLAG_NODEFRAG)
663 flags |= FS_XFLAG_NODEFRAG;
664 if (di_flags & XFS_DIFLAG_FILESTREAM)
665 flags |= FS_XFLAG_FILESTREAM;
666 }
667
668 if (di_flags2 & XFS_DIFLAG2_ANY) {
669 if (di_flags2 & XFS_DIFLAG2_DAX)
670 flags |= FS_XFLAG_DAX;
671 if (di_flags2 & XFS_DIFLAG2_COWEXTSIZE)
672 flags |= FS_XFLAG_COWEXTSIZE;
673 }
674
675 if (has_attr)
676 flags |= FS_XFLAG_HASATTR;
677
678 return flags;
679}
680
681uint
682xfs_ip2xflags(
683 struct xfs_inode *ip)
684{
685 struct xfs_icdinode *dic = &ip->i_d;
686
687 return _xfs_dic2xflags(dic->di_flags, dic->di_flags2, XFS_IFORK_Q(ip));
688}
689
690/*
691 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
692 * is allowed, otherwise it has to be an exact match. If a CI match is found,
693 * ci_name->name will point to a the actual name (caller must free) or
694 * will be set to NULL if an exact match is found.
695 */
696int
697xfs_lookup(
698 xfs_inode_t *dp,
699 struct xfs_name *name,
700 xfs_inode_t **ipp,
701 struct xfs_name *ci_name)
702{
703 xfs_ino_t inum;
704 int error;
705
706 trace_xfs_lookup(dp, name);
707
708 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
709 return -EIO;
710
711 error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
712 if (error)
713 goto out_unlock;
714
715 error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
716 if (error)
717 goto out_free_name;
718
719 return 0;
720
721out_free_name:
722 if (ci_name)
723 kmem_free(ci_name->name);
724out_unlock:
725 *ipp = NULL;
726 return error;
727}
728
729/*
730 * Allocate an inode on disk and return a copy of its in-core version.
731 * The in-core inode is locked exclusively. Set mode, nlink, and rdev
732 * appropriately within the inode. The uid and gid for the inode are
733 * set according to the contents of the given cred structure.
734 *
735 * Use xfs_dialloc() to allocate the on-disk inode. If xfs_dialloc()
736 * has a free inode available, call xfs_iget() to obtain the in-core
737 * version of the allocated inode. Finally, fill in the inode and
738 * log its initial contents. In this case, ialloc_context would be
739 * set to NULL.
740 *
741 * If xfs_dialloc() does not have an available inode, it will replenish
742 * its supply by doing an allocation. Since we can only do one
743 * allocation within a transaction without deadlocks, we must commit
744 * the current transaction before returning the inode itself.
745 * In this case, therefore, we will set ialloc_context and return.
746 * The caller should then commit the current transaction, start a new
747 * transaction, and call xfs_ialloc() again to actually get the inode.
748 *
749 * To ensure that some other process does not grab the inode that
750 * was allocated during the first call to xfs_ialloc(), this routine
751 * also returns the [locked] bp pointing to the head of the freelist
752 * as ialloc_context. The caller should hold this buffer across
753 * the commit and pass it back into this routine on the second call.
754 *
755 * If we are allocating quota inodes, we do not have a parent inode
756 * to attach to or associate with (i.e. pip == NULL) because they
757 * are not linked into the directory structure - they are attached
758 * directly to the superblock - and so have no parent.
759 */
760static int
761xfs_ialloc(
762 xfs_trans_t *tp,
763 xfs_inode_t *pip,
764 umode_t mode,
765 xfs_nlink_t nlink,
766 dev_t rdev,
767 prid_t prid,
768 xfs_buf_t **ialloc_context,
769 xfs_inode_t **ipp)
770{
771 struct xfs_mount *mp = tp->t_mountp;
772 xfs_ino_t ino;
773 xfs_inode_t *ip;
774 uint flags;
775 int error;
776 struct timespec tv;
777 struct inode *inode;
778
779 /*
780 * Call the space management code to pick
781 * the on-disk inode to be allocated.
782 */
783 error = xfs_dialloc(tp, pip ? pip->i_ino : 0, mode,
784 ialloc_context, &ino);
785 if (error)
786 return error;
787 if (*ialloc_context || ino == NULLFSINO) {
788 *ipp = NULL;
789 return 0;
790 }
791 ASSERT(*ialloc_context == NULL);
792
793 /*
794 * Get the in-core inode with the lock held exclusively.
795 * This is because we're setting fields here we need
796 * to prevent others from looking at until we're done.
797 */
798 error = xfs_iget(mp, tp, ino, XFS_IGET_CREATE,
799 XFS_ILOCK_EXCL, &ip);
800 if (error)
801 return error;
802 ASSERT(ip != NULL);
803 inode = VFS_I(ip);
804
805 /*
806 * We always convert v1 inodes to v2 now - we only support filesystems
807 * with >= v2 inode capability, so there is no reason for ever leaving
808 * an inode in v1 format.
809 */
810 if (ip->i_d.di_version == 1)
811 ip->i_d.di_version = 2;
812
813 inode->i_mode = mode;
814 set_nlink(inode, nlink);
815 ip->i_d.di_uid = xfs_kuid_to_uid(current_fsuid());
816 ip->i_d.di_gid = xfs_kgid_to_gid(current_fsgid());
817 inode->i_rdev = rdev;
818 xfs_set_projid(ip, prid);
819
820 if (pip && XFS_INHERIT_GID(pip)) {
821 ip->i_d.di_gid = pip->i_d.di_gid;
822 if ((VFS_I(pip)->i_mode & S_ISGID) && S_ISDIR(mode))
823 inode->i_mode |= S_ISGID;
824 }
825
826 /*
827 * If the group ID of the new file does not match the effective group
828 * ID or one of the supplementary group IDs, the S_ISGID bit is cleared
829 * (and only if the irix_sgid_inherit compatibility variable is set).
830 */
831 if ((irix_sgid_inherit) &&
832 (inode->i_mode & S_ISGID) &&
833 (!in_group_p(xfs_gid_to_kgid(ip->i_d.di_gid))))
834 inode->i_mode &= ~S_ISGID;
835
836 ip->i_d.di_size = 0;
837 ip->i_d.di_nextents = 0;
838 ASSERT(ip->i_d.di_nblocks == 0);
839
840 tv = current_time(inode);
841 inode->i_mtime = tv;
842 inode->i_atime = tv;
843 inode->i_ctime = tv;
844
845 ip->i_d.di_extsize = 0;
846 ip->i_d.di_dmevmask = 0;
847 ip->i_d.di_dmstate = 0;
848 ip->i_d.di_flags = 0;
849
850 if (ip->i_d.di_version == 3) {
851 inode_set_iversion(inode, 1);
852 ip->i_d.di_flags2 = 0;
853 ip->i_d.di_cowextsize = 0;
854 ip->i_d.di_crtime.t_sec = (int32_t)tv.tv_sec;
855 ip->i_d.di_crtime.t_nsec = (int32_t)tv.tv_nsec;
856 }
857
858
859 flags = XFS_ILOG_CORE;
860 switch (mode & S_IFMT) {
861 case S_IFIFO:
862 case S_IFCHR:
863 case S_IFBLK:
864 case S_IFSOCK:
865 ip->i_d.di_format = XFS_DINODE_FMT_DEV;
866 ip->i_df.if_flags = 0;
867 flags |= XFS_ILOG_DEV;
868 break;
869 case S_IFREG:
870 case S_IFDIR:
871 if (pip && (pip->i_d.di_flags & XFS_DIFLAG_ANY)) {
872 uint di_flags = 0;
873
874 if (S_ISDIR(mode)) {
875 if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
876 di_flags |= XFS_DIFLAG_RTINHERIT;
877 if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
878 di_flags |= XFS_DIFLAG_EXTSZINHERIT;
879 ip->i_d.di_extsize = pip->i_d.di_extsize;
880 }
881 if (pip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
882 di_flags |= XFS_DIFLAG_PROJINHERIT;
883 } else if (S_ISREG(mode)) {
884 if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
885 di_flags |= XFS_DIFLAG_REALTIME;
886 if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
887 di_flags |= XFS_DIFLAG_EXTSIZE;
888 ip->i_d.di_extsize = pip->i_d.di_extsize;
889 }
890 }
891 if ((pip->i_d.di_flags & XFS_DIFLAG_NOATIME) &&
892 xfs_inherit_noatime)
893 di_flags |= XFS_DIFLAG_NOATIME;
894 if ((pip->i_d.di_flags & XFS_DIFLAG_NODUMP) &&
895 xfs_inherit_nodump)
896 di_flags |= XFS_DIFLAG_NODUMP;
897 if ((pip->i_d.di_flags & XFS_DIFLAG_SYNC) &&
898 xfs_inherit_sync)
899 di_flags |= XFS_DIFLAG_SYNC;
900 if ((pip->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) &&
901 xfs_inherit_nosymlinks)
902 di_flags |= XFS_DIFLAG_NOSYMLINKS;
903 if ((pip->i_d.di_flags & XFS_DIFLAG_NODEFRAG) &&
904 xfs_inherit_nodefrag)
905 di_flags |= XFS_DIFLAG_NODEFRAG;
906 if (pip->i_d.di_flags & XFS_DIFLAG_FILESTREAM)
907 di_flags |= XFS_DIFLAG_FILESTREAM;
908
909 ip->i_d.di_flags |= di_flags;
910 }
911 if (pip &&
912 (pip->i_d.di_flags2 & XFS_DIFLAG2_ANY) &&
913 pip->i_d.di_version == 3 &&
914 ip->i_d.di_version == 3) {
915 uint64_t di_flags2 = 0;
916
917 if (pip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE) {
918 di_flags2 |= XFS_DIFLAG2_COWEXTSIZE;
919 ip->i_d.di_cowextsize = pip->i_d.di_cowextsize;
920 }
921 if (pip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
922 di_flags2 |= XFS_DIFLAG2_DAX;
923
924 ip->i_d.di_flags2 |= di_flags2;
925 }
926 /* FALLTHROUGH */
927 case S_IFLNK:
928 ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS;
929 ip->i_df.if_flags = XFS_IFEXTENTS;
930 ip->i_df.if_bytes = ip->i_df.if_real_bytes = 0;
931 ip->i_df.if_u1.if_root = NULL;
932 break;
933 default:
934 ASSERT(0);
935 }
936 /*
937 * Attribute fork settings for new inode.
938 */
939 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
940 ip->i_d.di_anextents = 0;
941
942 /*
943 * Log the new values stuffed into the inode.
944 */
945 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
946 xfs_trans_log_inode(tp, ip, flags);
947
948 /* now that we have an i_mode we can setup the inode structure */
949 xfs_setup_inode(ip);
950
951 *ipp = ip;
952 return 0;
953}
954
955/*
956 * Allocates a new inode from disk and return a pointer to the
957 * incore copy. This routine will internally commit the current
958 * transaction and allocate a new one if the Space Manager needed
959 * to do an allocation to replenish the inode free-list.
960 *
961 * This routine is designed to be called from xfs_create and
962 * xfs_create_dir.
963 *
964 */
965int
966xfs_dir_ialloc(
967 xfs_trans_t **tpp, /* input: current transaction;
968 output: may be a new transaction. */
969 xfs_inode_t *dp, /* directory within whose allocate
970 the inode. */
971 umode_t mode,
972 xfs_nlink_t nlink,
973 dev_t rdev,
974 prid_t prid, /* project id */
975 xfs_inode_t **ipp) /* pointer to inode; it will be
976 locked. */
977{
978 xfs_trans_t *tp;
979 xfs_inode_t *ip;
980 xfs_buf_t *ialloc_context = NULL;
981 int code;
982 void *dqinfo;
983 uint tflags;
984
985 tp = *tpp;
986 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
987
988 /*
989 * xfs_ialloc will return a pointer to an incore inode if
990 * the Space Manager has an available inode on the free
991 * list. Otherwise, it will do an allocation and replenish
992 * the freelist. Since we can only do one allocation per
993 * transaction without deadlocks, we will need to commit the
994 * current transaction and start a new one. We will then
995 * need to call xfs_ialloc again to get the inode.
996 *
997 * If xfs_ialloc did an allocation to replenish the freelist,
998 * it returns the bp containing the head of the freelist as
999 * ialloc_context. We will hold a lock on it across the
1000 * transaction commit so that no other process can steal
1001 * the inode(s) that we've just allocated.
1002 */
1003 code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid, &ialloc_context,
1004 &ip);
1005
1006 /*
1007 * Return an error if we were unable to allocate a new inode.
1008 * This should only happen if we run out of space on disk or
1009 * encounter a disk error.
1010 */
1011 if (code) {
1012 *ipp = NULL;
1013 return code;
1014 }
1015 if (!ialloc_context && !ip) {
1016 *ipp = NULL;
1017 return -ENOSPC;
1018 }
1019
1020 /*
1021 * If the AGI buffer is non-NULL, then we were unable to get an
1022 * inode in one operation. We need to commit the current
1023 * transaction and call xfs_ialloc() again. It is guaranteed
1024 * to succeed the second time.
1025 */
1026 if (ialloc_context) {
1027 /*
1028 * Normally, xfs_trans_commit releases all the locks.
1029 * We call bhold to hang on to the ialloc_context across
1030 * the commit. Holding this buffer prevents any other
1031 * processes from doing any allocations in this
1032 * allocation group.
1033 */
1034 xfs_trans_bhold(tp, ialloc_context);
1035
1036 /*
1037 * We want the quota changes to be associated with the next
1038 * transaction, NOT this one. So, detach the dqinfo from this
1039 * and attach it to the next transaction.
1040 */
1041 dqinfo = NULL;
1042 tflags = 0;
1043 if (tp->t_dqinfo) {
1044 dqinfo = (void *)tp->t_dqinfo;
1045 tp->t_dqinfo = NULL;
1046 tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY;
1047 tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY);
1048 }
1049
1050 code = xfs_trans_roll(&tp);
1051
1052 /*
1053 * Re-attach the quota info that we detached from prev trx.
1054 */
1055 if (dqinfo) {
1056 tp->t_dqinfo = dqinfo;
1057 tp->t_flags |= tflags;
1058 }
1059
1060 if (code) {
1061 xfs_buf_relse(ialloc_context);
1062 *tpp = tp;
1063 *ipp = NULL;
1064 return code;
1065 }
1066 xfs_trans_bjoin(tp, ialloc_context);
1067
1068 /*
1069 * Call ialloc again. Since we've locked out all
1070 * other allocations in this allocation group,
1071 * this call should always succeed.
1072 */
1073 code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid,
1074 &ialloc_context, &ip);
1075
1076 /*
1077 * If we get an error at this point, return to the caller
1078 * so that the current transaction can be aborted.
1079 */
1080 if (code) {
1081 *tpp = tp;
1082 *ipp = NULL;
1083 return code;
1084 }
1085 ASSERT(!ialloc_context && ip);
1086
1087 }
1088
1089 *ipp = ip;
1090 *tpp = tp;
1091
1092 return 0;
1093}
1094
1095/*
1096 * Decrement the link count on an inode & log the change. If this causes the
1097 * link count to go to zero, move the inode to AGI unlinked list so that it can
1098 * be freed when the last active reference goes away via xfs_inactive().
1099 */
1100static int /* error */
1101xfs_droplink(
1102 xfs_trans_t *tp,
1103 xfs_inode_t *ip)
1104{
1105 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
1106
1107 drop_nlink(VFS_I(ip));
1108 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1109
1110 if (VFS_I(ip)->i_nlink)
1111 return 0;
1112
1113 return xfs_iunlink(tp, ip);
1114}
1115
1116/*
1117 * Increment the link count on an inode & log the change.
1118 */
1119static int
1120xfs_bumplink(
1121 xfs_trans_t *tp,
1122 xfs_inode_t *ip)
1123{
1124 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
1125
1126 ASSERT(ip->i_d.di_version > 1);
1127 inc_nlink(VFS_I(ip));
1128 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1129 return 0;
1130}
1131
1132int
1133xfs_create(
1134 xfs_inode_t *dp,
1135 struct xfs_name *name,
1136 umode_t mode,
1137 dev_t rdev,
1138 xfs_inode_t **ipp)
1139{
1140 int is_dir = S_ISDIR(mode);
1141 struct xfs_mount *mp = dp->i_mount;
1142 struct xfs_inode *ip = NULL;
1143 struct xfs_trans *tp = NULL;
1144 int error;
1145 struct xfs_defer_ops dfops;
1146 xfs_fsblock_t first_block;
1147 bool unlock_dp_on_error = false;
1148 prid_t prid;
1149 struct xfs_dquot *udqp = NULL;
1150 struct xfs_dquot *gdqp = NULL;
1151 struct xfs_dquot *pdqp = NULL;
1152 struct xfs_trans_res *tres;
1153 uint resblks;
1154
1155 trace_xfs_create(dp, name);
1156
1157 if (XFS_FORCED_SHUTDOWN(mp))
1158 return -EIO;
1159
1160 prid = xfs_get_initial_prid(dp);
1161
1162 /*
1163 * Make sure that we have allocated dquot(s) on disk.
1164 */
1165 error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()),
1166 xfs_kgid_to_gid(current_fsgid()), prid,
1167 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
1168 &udqp, &gdqp, &pdqp);
1169 if (error)
1170 return error;
1171
1172 if (is_dir) {
1173 resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
1174 tres = &M_RES(mp)->tr_mkdir;
1175 } else {
1176 resblks = XFS_CREATE_SPACE_RES(mp, name->len);
1177 tres = &M_RES(mp)->tr_create;
1178 }
1179
1180 /*
1181 * Initially assume that the file does not exist and
1182 * reserve the resources for that case. If that is not
1183 * the case we'll drop the one we have and get a more
1184 * appropriate transaction later.
1185 */
1186 error = xfs_trans_alloc(mp, tres, resblks, 0, 0, &tp);
1187 if (error == -ENOSPC) {
1188 /* flush outstanding delalloc blocks and retry */
1189 xfs_flush_inodes(mp);
1190 error = xfs_trans_alloc(mp, tres, resblks, 0, 0, &tp);
1191 }
1192 if (error)
1193 goto out_release_inode;
1194
1195 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
1196 unlock_dp_on_error = true;
1197
1198 xfs_defer_init(&dfops, &first_block);
1199
1200 /*
1201 * Reserve disk quota and the inode.
1202 */
1203 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
1204 pdqp, resblks, 1, 0);
1205 if (error)
1206 goto out_trans_cancel;
1207
1208 /*
1209 * A newly created regular or special file just has one directory
1210 * entry pointing to them, but a directory also the "." entry
1211 * pointing to itself.
1212 */
1213 error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev, prid, &ip);
1214 if (error)
1215 goto out_trans_cancel;
1216
1217 /*
1218 * Now we join the directory inode to the transaction. We do not do it
1219 * earlier because xfs_dir_ialloc might commit the previous transaction
1220 * (and release all the locks). An error from here on will result in
1221 * the transaction cancel unlocking dp so don't do it explicitly in the
1222 * error path.
1223 */
1224 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
1225 unlock_dp_on_error = false;
1226
1227 error = xfs_dir_createname(tp, dp, name, ip->i_ino,
1228 &first_block, &dfops, resblks ?
1229 resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
1230 if (error) {
1231 ASSERT(error != -ENOSPC);
1232 goto out_trans_cancel;
1233 }
1234 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1235 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1236
1237 if (is_dir) {
1238 error = xfs_dir_init(tp, ip, dp);
1239 if (error)
1240 goto out_bmap_cancel;
1241
1242 error = xfs_bumplink(tp, dp);
1243 if (error)
1244 goto out_bmap_cancel;
1245 }
1246
1247 /*
1248 * If this is a synchronous mount, make sure that the
1249 * create transaction goes to disk before returning to
1250 * the user.
1251 */
1252 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
1253 xfs_trans_set_sync(tp);
1254
1255 /*
1256 * Attach the dquot(s) to the inodes and modify them incore.
1257 * These ids of the inode couldn't have changed since the new
1258 * inode has been locked ever since it was created.
1259 */
1260 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
1261
1262 error = xfs_defer_finish(&tp, &dfops);
1263 if (error)
1264 goto out_bmap_cancel;
1265
1266 error = xfs_trans_commit(tp);
1267 if (error)
1268 goto out_release_inode;
1269
1270 xfs_qm_dqrele(udqp);
1271 xfs_qm_dqrele(gdqp);
1272 xfs_qm_dqrele(pdqp);
1273
1274 *ipp = ip;
1275 return 0;
1276
1277 out_bmap_cancel:
1278 xfs_defer_cancel(&dfops);
1279 out_trans_cancel:
1280 xfs_trans_cancel(tp);
1281 out_release_inode:
1282 /*
1283 * Wait until after the current transaction is aborted to finish the
1284 * setup of the inode and release the inode. This prevents recursive
1285 * transactions and deadlocks from xfs_inactive.
1286 */
1287 if (ip) {
1288 xfs_finish_inode_setup(ip);
1289 IRELE(ip);
1290 }
1291
1292 xfs_qm_dqrele(udqp);
1293 xfs_qm_dqrele(gdqp);
1294 xfs_qm_dqrele(pdqp);
1295
1296 if (unlock_dp_on_error)
1297 xfs_iunlock(dp, XFS_ILOCK_EXCL);
1298 return error;
1299}
1300
1301int
1302xfs_create_tmpfile(
1303 struct xfs_inode *dp,
1304 umode_t mode,
1305 struct xfs_inode **ipp)
1306{
1307 struct xfs_mount *mp = dp->i_mount;
1308 struct xfs_inode *ip = NULL;
1309 struct xfs_trans *tp = NULL;
1310 int error;
1311 prid_t prid;
1312 struct xfs_dquot *udqp = NULL;
1313 struct xfs_dquot *gdqp = NULL;
1314 struct xfs_dquot *pdqp = NULL;
1315 struct xfs_trans_res *tres;
1316 uint resblks;
1317
1318 if (XFS_FORCED_SHUTDOWN(mp))
1319 return -EIO;
1320
1321 prid = xfs_get_initial_prid(dp);
1322
1323 /*
1324 * Make sure that we have allocated dquot(s) on disk.
1325 */
1326 error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()),
1327 xfs_kgid_to_gid(current_fsgid()), prid,
1328 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
1329 &udqp, &gdqp, &pdqp);
1330 if (error)
1331 return error;
1332
1333 resblks = XFS_IALLOC_SPACE_RES(mp);
1334 tres = &M_RES(mp)->tr_create_tmpfile;
1335
1336 error = xfs_trans_alloc(mp, tres, resblks, 0, 0, &tp);
1337 if (error)
1338 goto out_release_inode;
1339
1340 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
1341 pdqp, resblks, 1, 0);
1342 if (error)
1343 goto out_trans_cancel;
1344
1345 error = xfs_dir_ialloc(&tp, dp, mode, 1, 0, prid, &ip);
1346 if (error)
1347 goto out_trans_cancel;
1348
1349 if (mp->m_flags & XFS_MOUNT_WSYNC)
1350 xfs_trans_set_sync(tp);
1351
1352 /*
1353 * Attach the dquot(s) to the inodes and modify them incore.
1354 * These ids of the inode couldn't have changed since the new
1355 * inode has been locked ever since it was created.
1356 */
1357 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
1358
1359 error = xfs_iunlink(tp, ip);
1360 if (error)
1361 goto out_trans_cancel;
1362
1363 error = xfs_trans_commit(tp);
1364 if (error)
1365 goto out_release_inode;
1366
1367 xfs_qm_dqrele(udqp);
1368 xfs_qm_dqrele(gdqp);
1369 xfs_qm_dqrele(pdqp);
1370
1371 *ipp = ip;
1372 return 0;
1373
1374 out_trans_cancel:
1375 xfs_trans_cancel(tp);
1376 out_release_inode:
1377 /*
1378 * Wait until after the current transaction is aborted to finish the
1379 * setup of the inode and release the inode. This prevents recursive
1380 * transactions and deadlocks from xfs_inactive.
1381 */
1382 if (ip) {
1383 xfs_finish_inode_setup(ip);
1384 IRELE(ip);
1385 }
1386
1387 xfs_qm_dqrele(udqp);
1388 xfs_qm_dqrele(gdqp);
1389 xfs_qm_dqrele(pdqp);
1390
1391 return error;
1392}
1393
1394int
1395xfs_link(
1396 xfs_inode_t *tdp,
1397 xfs_inode_t *sip,
1398 struct xfs_name *target_name)
1399{
1400 xfs_mount_t *mp = tdp->i_mount;
1401 xfs_trans_t *tp;
1402 int error;
1403 struct xfs_defer_ops dfops;
1404 xfs_fsblock_t first_block;
1405 int resblks;
1406
1407 trace_xfs_link(tdp, target_name);
1408
1409 ASSERT(!S_ISDIR(VFS_I(sip)->i_mode));
1410
1411 if (XFS_FORCED_SHUTDOWN(mp))
1412 return -EIO;
1413
1414 error = xfs_qm_dqattach(sip, 0);
1415 if (error)
1416 goto std_return;
1417
1418 error = xfs_qm_dqattach(tdp, 0);
1419 if (error)
1420 goto std_return;
1421
1422 resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
1423 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_link, resblks, 0, 0, &tp);
1424 if (error == -ENOSPC) {
1425 resblks = 0;
1426 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_link, 0, 0, 0, &tp);
1427 }
1428 if (error)
1429 goto std_return;
1430
1431 xfs_lock_two_inodes(sip, XFS_ILOCK_EXCL, tdp, XFS_ILOCK_EXCL);
1432
1433 xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
1434 xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
1435
1436 /*
1437 * If we are using project inheritance, we only allow hard link
1438 * creation in our tree when the project IDs are the same; else
1439 * the tree quota mechanism could be circumvented.
1440 */
1441 if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1442 (xfs_get_projid(tdp) != xfs_get_projid(sip)))) {
1443 error = -EXDEV;
1444 goto error_return;
1445 }
1446
1447 if (!resblks) {
1448 error = xfs_dir_canenter(tp, tdp, target_name);
1449 if (error)
1450 goto error_return;
1451 }
1452
1453 xfs_defer_init(&dfops, &first_block);
1454
1455 /*
1456 * Handle initial link state of O_TMPFILE inode
1457 */
1458 if (VFS_I(sip)->i_nlink == 0) {
1459 error = xfs_iunlink_remove(tp, sip);
1460 if (error)
1461 goto error_return;
1462 }
1463
1464 error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
1465 &first_block, &dfops, resblks);
1466 if (error)
1467 goto error_return;
1468 xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1469 xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
1470
1471 error = xfs_bumplink(tp, sip);
1472 if (error)
1473 goto error_return;
1474
1475 /*
1476 * If this is a synchronous mount, make sure that the
1477 * link transaction goes to disk before returning to
1478 * the user.
1479 */
1480 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
1481 xfs_trans_set_sync(tp);
1482
1483 error = xfs_defer_finish(&tp, &dfops);
1484 if (error) {
1485 xfs_defer_cancel(&dfops);
1486 goto error_return;
1487 }
1488
1489 return xfs_trans_commit(tp);
1490
1491 error_return:
1492 xfs_trans_cancel(tp);
1493 std_return:
1494 return error;
1495}
1496
1497/* Clear the reflink flag and the cowblocks tag if possible. */
1498static void
1499xfs_itruncate_clear_reflink_flags(
1500 struct xfs_inode *ip)
1501{
1502 struct xfs_ifork *dfork;
1503 struct xfs_ifork *cfork;
1504
1505 if (!xfs_is_reflink_inode(ip))
1506 return;
1507 dfork = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1508 cfork = XFS_IFORK_PTR(ip, XFS_COW_FORK);
1509 if (dfork->if_bytes == 0 && cfork->if_bytes == 0)
1510 ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
1511 if (cfork->if_bytes == 0)
1512 xfs_inode_clear_cowblocks_tag(ip);
1513}
1514
1515/*
1516 * Free up the underlying blocks past new_size. The new size must be smaller
1517 * than the current size. This routine can be used both for the attribute and
1518 * data fork, and does not modify the inode size, which is left to the caller.
1519 *
1520 * The transaction passed to this routine must have made a permanent log
1521 * reservation of at least XFS_ITRUNCATE_LOG_RES. This routine may commit the
1522 * given transaction and start new ones, so make sure everything involved in
1523 * the transaction is tidy before calling here. Some transaction will be
1524 * returned to the caller to be committed. The incoming transaction must
1525 * already include the inode, and both inode locks must be held exclusively.
1526 * The inode must also be "held" within the transaction. On return the inode
1527 * will be "held" within the returned transaction. This routine does NOT
1528 * require any disk space to be reserved for it within the transaction.
1529 *
1530 * If we get an error, we must return with the inode locked and linked into the
1531 * current transaction. This keeps things simple for the higher level code,
1532 * because it always knows that the inode is locked and held in the transaction
1533 * that returns to it whether errors occur or not. We don't mark the inode
1534 * dirty on error so that transactions can be easily aborted if possible.
1535 */
1536int
1537xfs_itruncate_extents(
1538 struct xfs_trans **tpp,
1539 struct xfs_inode *ip,
1540 int whichfork,
1541 xfs_fsize_t new_size)
1542{
1543 struct xfs_mount *mp = ip->i_mount;
1544 struct xfs_trans *tp = *tpp;
1545 struct xfs_defer_ops dfops;
1546 xfs_fsblock_t first_block;
1547 xfs_fileoff_t first_unmap_block;
1548 xfs_fileoff_t last_block;
1549 xfs_filblks_t unmap_len;
1550 int error = 0;
1551 int done = 0;
1552
1553 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1554 ASSERT(!atomic_read(&VFS_I(ip)->i_count) ||
1555 xfs_isilocked(ip, XFS_IOLOCK_EXCL));
1556 ASSERT(new_size <= XFS_ISIZE(ip));
1557 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
1558 ASSERT(ip->i_itemp != NULL);
1559 ASSERT(ip->i_itemp->ili_lock_flags == 0);
1560 ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
1561
1562 trace_xfs_itruncate_extents_start(ip, new_size);
1563
1564 /*
1565 * Since it is possible for space to become allocated beyond
1566 * the end of the file (in a crash where the space is allocated
1567 * but the inode size is not yet updated), simply remove any
1568 * blocks which show up between the new EOF and the maximum
1569 * possible file size. If the first block to be removed is
1570 * beyond the maximum file size (ie it is the same as last_block),
1571 * then there is nothing to do.
1572 */
1573 first_unmap_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size);
1574 last_block = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
1575 if (first_unmap_block == last_block)
1576 return 0;
1577
1578 ASSERT(first_unmap_block < last_block);
1579 unmap_len = last_block - first_unmap_block + 1;
1580 while (!done) {
1581 xfs_defer_init(&dfops, &first_block);
1582 error = xfs_bunmapi(tp, ip,
1583 first_unmap_block, unmap_len,
1584 xfs_bmapi_aflag(whichfork),
1585 XFS_ITRUNC_MAX_EXTENTS,
1586 &first_block, &dfops,
1587 &done);
1588 if (error)
1589 goto out_bmap_cancel;
1590
1591 /*
1592 * Duplicate the transaction that has the permanent
1593 * reservation and commit the old transaction.
1594 */
1595 xfs_defer_ijoin(&dfops, ip);
1596 error = xfs_defer_finish(&tp, &dfops);
1597 if (error)
1598 goto out_bmap_cancel;
1599
1600 error = xfs_trans_roll_inode(&tp, ip);
1601 if (error)
1602 goto out;
1603 }
1604
1605 if (whichfork == XFS_DATA_FORK) {
1606 /* Remove all pending CoW reservations. */
1607 error = xfs_reflink_cancel_cow_blocks(ip, &tp,
1608 first_unmap_block, last_block, true);
1609 if (error)
1610 goto out;
1611
1612 xfs_itruncate_clear_reflink_flags(ip);
1613 }
1614
1615 /*
1616 * Always re-log the inode so that our permanent transaction can keep
1617 * on rolling it forward in the log.
1618 */
1619 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1620
1621 trace_xfs_itruncate_extents_end(ip, new_size);
1622
1623out:
1624 *tpp = tp;
1625 return error;
1626out_bmap_cancel:
1627 /*
1628 * If the bunmapi call encounters an error, return to the caller where
1629 * the transaction can be properly aborted. We just need to make sure
1630 * we're not holding any resources that we were not when we came in.
1631 */
1632 xfs_defer_cancel(&dfops);
1633 goto out;
1634}
1635
1636int
1637xfs_release(
1638 xfs_inode_t *ip)
1639{
1640 xfs_mount_t *mp = ip->i_mount;
1641 int error;
1642
1643 if (!S_ISREG(VFS_I(ip)->i_mode) || (VFS_I(ip)->i_mode == 0))
1644 return 0;
1645
1646 /* If this is a read-only mount, don't do this (would generate I/O) */
1647 if (mp->m_flags & XFS_MOUNT_RDONLY)
1648 return 0;
1649
1650 if (!XFS_FORCED_SHUTDOWN(mp)) {
1651 int truncated;
1652
1653 /*
1654 * If we previously truncated this file and removed old data
1655 * in the process, we want to initiate "early" writeout on
1656 * the last close. This is an attempt to combat the notorious
1657 * NULL files problem which is particularly noticeable from a
1658 * truncate down, buffered (re-)write (delalloc), followed by
1659 * a crash. What we are effectively doing here is
1660 * significantly reducing the time window where we'd otherwise
1661 * be exposed to that problem.
1662 */
1663 truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
1664 if (truncated) {
1665 xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
1666 if (ip->i_delayed_blks > 0) {
1667 error = filemap_flush(VFS_I(ip)->i_mapping);
1668 if (error)
1669 return error;
1670 }
1671 }
1672 }
1673
1674 if (VFS_I(ip)->i_nlink == 0)
1675 return 0;
1676
1677 if (xfs_can_free_eofblocks(ip, false)) {
1678
1679 /*
1680 * Check if the inode is being opened, written and closed
1681 * frequently and we have delayed allocation blocks outstanding
1682 * (e.g. streaming writes from the NFS server), truncating the
1683 * blocks past EOF will cause fragmentation to occur.
1684 *
1685 * In this case don't do the truncation, but we have to be
1686 * careful how we detect this case. Blocks beyond EOF show up as
1687 * i_delayed_blks even when the inode is clean, so we need to
1688 * truncate them away first before checking for a dirty release.
1689 * Hence on the first dirty close we will still remove the
1690 * speculative allocation, but after that we will leave it in
1691 * place.
1692 */
1693 if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE))
1694 return 0;
1695 /*
1696 * If we can't get the iolock just skip truncating the blocks
1697 * past EOF because we could deadlock with the mmap_sem
1698 * otherwise. We'll get another chance to drop them once the
1699 * last reference to the inode is dropped, so we'll never leak
1700 * blocks permanently.
1701 */
1702 if (xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
1703 error = xfs_free_eofblocks(ip);
1704 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1705 if (error)
1706 return error;
1707 }
1708
1709 /* delalloc blocks after truncation means it really is dirty */
1710 if (ip->i_delayed_blks)
1711 xfs_iflags_set(ip, XFS_IDIRTY_RELEASE);
1712 }
1713 return 0;
1714}
1715
1716/*
1717 * xfs_inactive_truncate
1718 *
1719 * Called to perform a truncate when an inode becomes unlinked.
1720 */
1721STATIC int
1722xfs_inactive_truncate(
1723 struct xfs_inode *ip)
1724{
1725 struct xfs_mount *mp = ip->i_mount;
1726 struct xfs_trans *tp;
1727 int error;
1728
1729 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
1730 if (error) {
1731 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1732 return error;
1733 }
1734
1735 xfs_ilock(ip, XFS_ILOCK_EXCL);
1736 xfs_trans_ijoin(tp, ip, 0);
1737
1738 /*
1739 * Log the inode size first to prevent stale data exposure in the event
1740 * of a system crash before the truncate completes. See the related
1741 * comment in xfs_vn_setattr_size() for details.
1742 */
1743 ip->i_d.di_size = 0;
1744 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1745
1746 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
1747 if (error)
1748 goto error_trans_cancel;
1749
1750 ASSERT(ip->i_d.di_nextents == 0);
1751
1752 error = xfs_trans_commit(tp);
1753 if (error)
1754 goto error_unlock;
1755
1756 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1757 return 0;
1758
1759error_trans_cancel:
1760 xfs_trans_cancel(tp);
1761error_unlock:
1762 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1763 return error;
1764}
1765
1766/*
1767 * xfs_inactive_ifree()
1768 *
1769 * Perform the inode free when an inode is unlinked.
1770 */
1771STATIC int
1772xfs_inactive_ifree(
1773 struct xfs_inode *ip)
1774{
1775 struct xfs_defer_ops dfops;
1776 xfs_fsblock_t first_block;
1777 struct xfs_mount *mp = ip->i_mount;
1778 struct xfs_trans *tp;
1779 int error;
1780
1781 /*
1782 * We try to use a per-AG reservation for any block needed by the finobt
1783 * tree, but as the finobt feature predates the per-AG reservation
1784 * support a degraded file system might not have enough space for the
1785 * reservation at mount time. In that case try to dip into the reserved
1786 * pool and pray.
1787 *
1788 * Send a warning if the reservation does happen to fail, as the inode
1789 * now remains allocated and sits on the unlinked list until the fs is
1790 * repaired.
1791 */
1792 if (unlikely(mp->m_inotbt_nores)) {
1793 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ifree,
1794 XFS_IFREE_SPACE_RES(mp), 0, XFS_TRANS_RESERVE,
1795 &tp);
1796 } else {
1797 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ifree, 0, 0, 0, &tp);
1798 }
1799 if (error) {
1800 if (error == -ENOSPC) {
1801 xfs_warn_ratelimited(mp,
1802 "Failed to remove inode(s) from unlinked list. "
1803 "Please free space, unmount and run xfs_repair.");
1804 } else {
1805 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1806 }
1807 return error;
1808 }
1809
1810 xfs_ilock(ip, XFS_ILOCK_EXCL);
1811 xfs_trans_ijoin(tp, ip, 0);
1812
1813 xfs_defer_init(&dfops, &first_block);
1814 error = xfs_ifree(tp, ip, &dfops);
1815 if (error) {
1816 /*
1817 * If we fail to free the inode, shut down. The cancel
1818 * might do that, we need to make sure. Otherwise the
1819 * inode might be lost for a long time or forever.
1820 */
1821 if (!XFS_FORCED_SHUTDOWN(mp)) {
1822 xfs_notice(mp, "%s: xfs_ifree returned error %d",
1823 __func__, error);
1824 xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
1825 }
1826 xfs_trans_cancel(tp);
1827 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1828 return error;
1829 }
1830
1831 /*
1832 * Credit the quota account(s). The inode is gone.
1833 */
1834 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
1835
1836 /*
1837 * Just ignore errors at this point. There is nothing we can do except
1838 * to try to keep going. Make sure it's not a silent error.
1839 */
1840 error = xfs_defer_finish(&tp, &dfops);
1841 if (error) {
1842 xfs_notice(mp, "%s: xfs_defer_finish returned error %d",
1843 __func__, error);
1844 xfs_defer_cancel(&dfops);
1845 }
1846 error = xfs_trans_commit(tp);
1847 if (error)
1848 xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
1849 __func__, error);
1850
1851 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1852 return 0;
1853}
1854
1855/*
1856 * xfs_inactive
1857 *
1858 * This is called when the vnode reference count for the vnode
1859 * goes to zero. If the file has been unlinked, then it must
1860 * now be truncated. Also, we clear all of the read-ahead state
1861 * kept for the inode here since the file is now closed.
1862 */
1863void
1864xfs_inactive(
1865 xfs_inode_t *ip)
1866{
1867 struct xfs_mount *mp;
1868 struct xfs_ifork *cow_ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
1869 int error;
1870 int truncate = 0;
1871
1872 /*
1873 * If the inode is already free, then there can be nothing
1874 * to clean up here.
1875 */
1876 if (VFS_I(ip)->i_mode == 0) {
1877 ASSERT(ip->i_df.if_real_bytes == 0);
1878 ASSERT(ip->i_df.if_broot_bytes == 0);
1879 return;
1880 }
1881
1882 mp = ip->i_mount;
1883 ASSERT(!xfs_iflags_test(ip, XFS_IRECOVERY));
1884
1885 /* If this is a read-only mount, don't do this (would generate I/O) */
1886 if (mp->m_flags & XFS_MOUNT_RDONLY)
1887 return;
1888
1889 /* Try to clean out the cow blocks if there are any. */
1890 if (xfs_is_reflink_inode(ip) && cow_ifp->if_bytes > 0)
1891 xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF, true);
1892
1893 if (VFS_I(ip)->i_nlink != 0) {
1894 /*
1895 * force is true because we are evicting an inode from the
1896 * cache. Post-eof blocks must be freed, lest we end up with
1897 * broken free space accounting.
1898 *
1899 * Note: don't bother with iolock here since lockdep complains
1900 * about acquiring it in reclaim context. We have the only
1901 * reference to the inode at this point anyways.
1902 */
1903 if (xfs_can_free_eofblocks(ip, true))
1904 xfs_free_eofblocks(ip);
1905
1906 return;
1907 }
1908
1909 if (S_ISREG(VFS_I(ip)->i_mode) &&
1910 (ip->i_d.di_size != 0 || XFS_ISIZE(ip) != 0 ||
1911 ip->i_d.di_nextents > 0 || ip->i_delayed_blks > 0))
1912 truncate = 1;
1913
1914 error = xfs_qm_dqattach(ip, 0);
1915 if (error)
1916 return;
1917
1918 if (S_ISLNK(VFS_I(ip)->i_mode))
1919 error = xfs_inactive_symlink(ip);
1920 else if (truncate)
1921 error = xfs_inactive_truncate(ip);
1922 if (error)
1923 return;
1924
1925 /*
1926 * If there are attributes associated with the file then blow them away
1927 * now. The code calls a routine that recursively deconstructs the
1928 * attribute fork. If also blows away the in-core attribute fork.
1929 */
1930 if (XFS_IFORK_Q(ip)) {
1931 error = xfs_attr_inactive(ip);
1932 if (error)
1933 return;
1934 }
1935
1936 ASSERT(!ip->i_afp);
1937 ASSERT(ip->i_d.di_anextents == 0);
1938 ASSERT(ip->i_d.di_forkoff == 0);
1939
1940 /*
1941 * Free the inode.
1942 */
1943 error = xfs_inactive_ifree(ip);
1944 if (error)
1945 return;
1946
1947 /*
1948 * Release the dquots held by inode, if any.
1949 */
1950 xfs_qm_dqdetach(ip);
1951}
1952
1953/*
1954 * This is called when the inode's link count goes to 0 or we are creating a
1955 * tmpfile via O_TMPFILE. In the case of a tmpfile, @ignore_linkcount will be
1956 * set to true as the link count is dropped to zero by the VFS after we've
1957 * created the file successfully, so we have to add it to the unlinked list
1958 * while the link count is non-zero.
1959 *
1960 * We place the on-disk inode on a list in the AGI. It will be pulled from this
1961 * list when the inode is freed.
1962 */
1963STATIC int
1964xfs_iunlink(
1965 struct xfs_trans *tp,
1966 struct xfs_inode *ip)
1967{
1968 xfs_mount_t *mp = tp->t_mountp;
1969 xfs_agi_t *agi;
1970 xfs_dinode_t *dip;
1971 xfs_buf_t *agibp;
1972 xfs_buf_t *ibp;
1973 xfs_agino_t agino;
1974 short bucket_index;
1975 int offset;
1976 int error;
1977
1978 ASSERT(VFS_I(ip)->i_mode != 0);
1979
1980 /*
1981 * Get the agi buffer first. It ensures lock ordering
1982 * on the list.
1983 */
1984 error = xfs_read_agi(mp, tp, XFS_INO_TO_AGNO(mp, ip->i_ino), &agibp);
1985 if (error)
1986 return error;
1987 agi = XFS_BUF_TO_AGI(agibp);
1988
1989 /*
1990 * Get the index into the agi hash table for the
1991 * list this inode will go on.
1992 */
1993 agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
1994 ASSERT(agino != 0);
1995 bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
1996 ASSERT(agi->agi_unlinked[bucket_index]);
1997 ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != agino);
1998
1999 if (agi->agi_unlinked[bucket_index] != cpu_to_be32(NULLAGINO)) {
2000 /*
2001 * There is already another inode in the bucket we need
2002 * to add ourselves to. Add us at the front of the list.
2003 * Here we put the head pointer into our next pointer,
2004 * and then we fall through to point the head at us.
2005 */
2006 error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
2007 0, 0);
2008 if (error)
2009 return error;
2010
2011 ASSERT(dip->di_next_unlinked == cpu_to_be32(NULLAGINO));
2012 dip->di_next_unlinked = agi->agi_unlinked[bucket_index];
2013 offset = ip->i_imap.im_boffset +
2014 offsetof(xfs_dinode_t, di_next_unlinked);
2015
2016 /* need to recalc the inode CRC if appropriate */
2017 xfs_dinode_calc_crc(mp, dip);
2018
2019 xfs_trans_inode_buf(tp, ibp);
2020 xfs_trans_log_buf(tp, ibp, offset,
2021 (offset + sizeof(xfs_agino_t) - 1));
2022 xfs_inobp_check(mp, ibp);
2023 }
2024
2025 /*
2026 * Point the bucket head pointer at the inode being inserted.
2027 */
2028 ASSERT(agino != 0);
2029 agi->agi_unlinked[bucket_index] = cpu_to_be32(agino);
2030 offset = offsetof(xfs_agi_t, agi_unlinked) +
2031 (sizeof(xfs_agino_t) * bucket_index);
2032 xfs_trans_log_buf(tp, agibp, offset,
2033 (offset + sizeof(xfs_agino_t) - 1));
2034 return 0;
2035}
2036
2037/*
2038 * Pull the on-disk inode from the AGI unlinked list.
2039 */
2040STATIC int
2041xfs_iunlink_remove(
2042 xfs_trans_t *tp,
2043 xfs_inode_t *ip)
2044{
2045 xfs_ino_t next_ino;
2046 xfs_mount_t *mp;
2047 xfs_agi_t *agi;
2048 xfs_dinode_t *dip;
2049 xfs_buf_t *agibp;
2050 xfs_buf_t *ibp;
2051 xfs_agnumber_t agno;
2052 xfs_agino_t agino;
2053 xfs_agino_t next_agino;
2054 xfs_buf_t *last_ibp;
2055 xfs_dinode_t *last_dip = NULL;
2056 short bucket_index;
2057 int offset, last_offset = 0;
2058 int error;
2059
2060 mp = tp->t_mountp;
2061 agno = XFS_INO_TO_AGNO(mp, ip->i_ino);
2062
2063 /*
2064 * Get the agi buffer first. It ensures lock ordering
2065 * on the list.
2066 */
2067 error = xfs_read_agi(mp, tp, agno, &agibp);
2068 if (error)
2069 return error;
2070
2071 agi = XFS_BUF_TO_AGI(agibp);
2072
2073 /*
2074 * Get the index into the agi hash table for the
2075 * list this inode will go on.
2076 */
2077 agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
2078 ASSERT(agino != 0);
2079 bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
2080 ASSERT(agi->agi_unlinked[bucket_index] != cpu_to_be32(NULLAGINO));
2081 ASSERT(agi->agi_unlinked[bucket_index]);
2082
2083 if (be32_to_cpu(agi->agi_unlinked[bucket_index]) == agino) {
2084 /*
2085 * We're at the head of the list. Get the inode's on-disk
2086 * buffer to see if there is anyone after us on the list.
2087 * Only modify our next pointer if it is not already NULLAGINO.
2088 * This saves us the overhead of dealing with the buffer when
2089 * there is no need to change it.
2090 */
2091 error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
2092 0, 0);
2093 if (error) {
2094 xfs_warn(mp, "%s: xfs_imap_to_bp returned error %d.",
2095 __func__, error);
2096 return error;
2097 }
2098 next_agino = be32_to_cpu(dip->di_next_unlinked);
2099 ASSERT(next_agino != 0);
2100 if (next_agino != NULLAGINO) {
2101 dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
2102 offset = ip->i_imap.im_boffset +
2103 offsetof(xfs_dinode_t, di_next_unlinked);
2104
2105 /* need to recalc the inode CRC if appropriate */
2106 xfs_dinode_calc_crc(mp, dip);
2107
2108 xfs_trans_inode_buf(tp, ibp);
2109 xfs_trans_log_buf(tp, ibp, offset,
2110 (offset + sizeof(xfs_agino_t) - 1));
2111 xfs_inobp_check(mp, ibp);
2112 } else {
2113 xfs_trans_brelse(tp, ibp);
2114 }
2115 /*
2116 * Point the bucket head pointer at the next inode.
2117 */
2118 ASSERT(next_agino != 0);
2119 ASSERT(next_agino != agino);
2120 agi->agi_unlinked[bucket_index] = cpu_to_be32(next_agino);
2121 offset = offsetof(xfs_agi_t, agi_unlinked) +
2122 (sizeof(xfs_agino_t) * bucket_index);
2123 xfs_trans_log_buf(tp, agibp, offset,
2124 (offset + sizeof(xfs_agino_t) - 1));
2125 } else {
2126 /*
2127 * We need to search the list for the inode being freed.
2128 */
2129 next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]);
2130 last_ibp = NULL;
2131 while (next_agino != agino) {
2132 struct xfs_imap imap;
2133
2134 if (last_ibp)
2135 xfs_trans_brelse(tp, last_ibp);
2136
2137 imap.im_blkno = 0;
2138 next_ino = XFS_AGINO_TO_INO(mp, agno, next_agino);
2139
2140 error = xfs_imap(mp, tp, next_ino, &imap, 0);
2141 if (error) {
2142 xfs_warn(mp,
2143 "%s: xfs_imap returned error %d.",
2144 __func__, error);
2145 return error;
2146 }
2147
2148 error = xfs_imap_to_bp(mp, tp, &imap, &last_dip,
2149 &last_ibp, 0, 0);
2150 if (error) {
2151 xfs_warn(mp,
2152 "%s: xfs_imap_to_bp returned error %d.",
2153 __func__, error);
2154 return error;
2155 }
2156
2157 last_offset = imap.im_boffset;
2158 next_agino = be32_to_cpu(last_dip->di_next_unlinked);
2159 ASSERT(next_agino != NULLAGINO);
2160 ASSERT(next_agino != 0);
2161 }
2162
2163 /*
2164 * Now last_ibp points to the buffer previous to us on the
2165 * unlinked list. Pull us from the list.
2166 */
2167 error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
2168 0, 0);
2169 if (error) {
2170 xfs_warn(mp, "%s: xfs_imap_to_bp(2) returned error %d.",
2171 __func__, error);
2172 return error;
2173 }
2174 next_agino = be32_to_cpu(dip->di_next_unlinked);
2175 ASSERT(next_agino != 0);
2176 ASSERT(next_agino != agino);
2177 if (next_agino != NULLAGINO) {
2178 dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
2179 offset = ip->i_imap.im_boffset +
2180 offsetof(xfs_dinode_t, di_next_unlinked);
2181
2182 /* need to recalc the inode CRC if appropriate */
2183 xfs_dinode_calc_crc(mp, dip);
2184
2185 xfs_trans_inode_buf(tp, ibp);
2186 xfs_trans_log_buf(tp, ibp, offset,
2187 (offset + sizeof(xfs_agino_t) - 1));
2188 xfs_inobp_check(mp, ibp);
2189 } else {
2190 xfs_trans_brelse(tp, ibp);
2191 }
2192 /*
2193 * Point the previous inode on the list to the next inode.
2194 */
2195 last_dip->di_next_unlinked = cpu_to_be32(next_agino);
2196 ASSERT(next_agino != 0);
2197 offset = last_offset + offsetof(xfs_dinode_t, di_next_unlinked);
2198
2199 /* need to recalc the inode CRC if appropriate */
2200 xfs_dinode_calc_crc(mp, last_dip);
2201
2202 xfs_trans_inode_buf(tp, last_ibp);
2203 xfs_trans_log_buf(tp, last_ibp, offset,
2204 (offset + sizeof(xfs_agino_t) - 1));
2205 xfs_inobp_check(mp, last_ibp);
2206 }
2207 return 0;
2208}
2209
2210/*
2211 * A big issue when freeing the inode cluster is that we _cannot_ skip any
2212 * inodes that are in memory - they all must be marked stale and attached to
2213 * the cluster buffer.
2214 */
2215STATIC int
2216xfs_ifree_cluster(
2217 xfs_inode_t *free_ip,
2218 xfs_trans_t *tp,
2219 struct xfs_icluster *xic)
2220{
2221 xfs_mount_t *mp = free_ip->i_mount;
2222 int blks_per_cluster;
2223 int inodes_per_cluster;
2224 int nbufs;
2225 int i, j;
2226 int ioffset;
2227 xfs_daddr_t blkno;
2228 xfs_buf_t *bp;
2229 xfs_inode_t *ip;
2230 xfs_inode_log_item_t *iip;
2231 struct xfs_log_item *lip;
2232 struct xfs_perag *pag;
2233 xfs_ino_t inum;
2234
2235 inum = xic->first_ino;
2236 pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, inum));
2237 blks_per_cluster = xfs_icluster_size_fsb(mp);
2238 inodes_per_cluster = blks_per_cluster << mp->m_sb.sb_inopblog;
2239 nbufs = mp->m_ialloc_blks / blks_per_cluster;
2240
2241 for (j = 0; j < nbufs; j++, inum += inodes_per_cluster) {
2242 /*
2243 * The allocation bitmap tells us which inodes of the chunk were
2244 * physically allocated. Skip the cluster if an inode falls into
2245 * a sparse region.
2246 */
2247 ioffset = inum - xic->first_ino;
2248 if ((xic->alloc & XFS_INOBT_MASK(ioffset)) == 0) {
2249 ASSERT(do_mod(ioffset, inodes_per_cluster) == 0);
2250 continue;
2251 }
2252
2253 blkno = XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, inum),
2254 XFS_INO_TO_AGBNO(mp, inum));
2255
2256 /*
2257 * We obtain and lock the backing buffer first in the process
2258 * here, as we have to ensure that any dirty inode that we
2259 * can't get the flush lock on is attached to the buffer.
2260 * If we scan the in-memory inodes first, then buffer IO can
2261 * complete before we get a lock on it, and hence we may fail
2262 * to mark all the active inodes on the buffer stale.
2263 */
2264 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno,
2265 mp->m_bsize * blks_per_cluster,
2266 XBF_UNMAPPED);
2267
2268 if (!bp)
2269 return -ENOMEM;
2270
2271 /*
2272 * This buffer may not have been correctly initialised as we
2273 * didn't read it from disk. That's not important because we are
2274 * only using to mark the buffer as stale in the log, and to
2275 * attach stale cached inodes on it. That means it will never be
2276 * dispatched for IO. If it is, we want to know about it, and we
2277 * want it to fail. We can acheive this by adding a write
2278 * verifier to the buffer.
2279 */
2280 bp->b_ops = &xfs_inode_buf_ops;
2281
2282 /*
2283 * Walk the inodes already attached to the buffer and mark them
2284 * stale. These will all have the flush locks held, so an
2285 * in-memory inode walk can't lock them. By marking them all
2286 * stale first, we will not attempt to lock them in the loop
2287 * below as the XFS_ISTALE flag will be set.
2288 */
2289 list_for_each_entry(lip, &bp->b_li_list, li_bio_list) {
2290 if (lip->li_type == XFS_LI_INODE) {
2291 iip = (xfs_inode_log_item_t *)lip;
2292 ASSERT(iip->ili_logged == 1);
2293 lip->li_cb = xfs_istale_done;
2294 xfs_trans_ail_copy_lsn(mp->m_ail,
2295 &iip->ili_flush_lsn,
2296 &iip->ili_item.li_lsn);
2297 xfs_iflags_set(iip->ili_inode, XFS_ISTALE);
2298 }
2299 }
2300
2301
2302 /*
2303 * For each inode in memory attempt to add it to the inode
2304 * buffer and set it up for being staled on buffer IO
2305 * completion. This is safe as we've locked out tail pushing
2306 * and flushing by locking the buffer.
2307 *
2308 * We have already marked every inode that was part of a
2309 * transaction stale above, which means there is no point in
2310 * even trying to lock them.
2311 */
2312 for (i = 0; i < inodes_per_cluster; i++) {
2313retry:
2314 rcu_read_lock();
2315 ip = radix_tree_lookup(&pag->pag_ici_root,
2316 XFS_INO_TO_AGINO(mp, (inum + i)));
2317
2318 /* Inode not in memory, nothing to do */
2319 if (!ip) {
2320 rcu_read_unlock();
2321 continue;
2322 }
2323
2324 /*
2325 * because this is an RCU protected lookup, we could
2326 * find a recently freed or even reallocated inode
2327 * during the lookup. We need to check under the
2328 * i_flags_lock for a valid inode here. Skip it if it
2329 * is not valid, the wrong inode or stale.
2330 */
2331 spin_lock(&ip->i_flags_lock);
2332 if (ip->i_ino != inum + i ||
2333 __xfs_iflags_test(ip, XFS_ISTALE)) {
2334 spin_unlock(&ip->i_flags_lock);
2335 rcu_read_unlock();
2336 continue;
2337 }
2338 spin_unlock(&ip->i_flags_lock);
2339
2340 /*
2341 * Don't try to lock/unlock the current inode, but we
2342 * _cannot_ skip the other inodes that we did not find
2343 * in the list attached to the buffer and are not
2344 * already marked stale. If we can't lock it, back off
2345 * and retry.
2346 */
2347 if (ip != free_ip) {
2348 if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) {
2349 rcu_read_unlock();
2350 delay(1);
2351 goto retry;
2352 }
2353
2354 /*
2355 * Check the inode number again in case we're
2356 * racing with freeing in xfs_reclaim_inode().
2357 * See the comments in that function for more
2358 * information as to why the initial check is
2359 * not sufficient.
2360 */
2361 if (ip->i_ino != inum + i) {
2362 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2363 rcu_read_unlock();
2364 continue;
2365 }
2366 }
2367 rcu_read_unlock();
2368
2369 xfs_iflock(ip);
2370 xfs_iflags_set(ip, XFS_ISTALE);
2371
2372 /*
2373 * we don't need to attach clean inodes or those only
2374 * with unlogged changes (which we throw away, anyway).
2375 */
2376 iip = ip->i_itemp;
2377 if (!iip || xfs_inode_clean(ip)) {
2378 ASSERT(ip != free_ip);
2379 xfs_ifunlock(ip);
2380 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2381 continue;
2382 }
2383
2384 iip->ili_last_fields = iip->ili_fields;
2385 iip->ili_fields = 0;
2386 iip->ili_fsync_fields = 0;
2387 iip->ili_logged = 1;
2388 xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
2389 &iip->ili_item.li_lsn);
2390
2391 xfs_buf_attach_iodone(bp, xfs_istale_done,
2392 &iip->ili_item);
2393
2394 if (ip != free_ip)
2395 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2396 }
2397
2398 xfs_trans_stale_inode_buf(tp, bp);
2399 xfs_trans_binval(tp, bp);
2400 }
2401
2402 xfs_perag_put(pag);
2403 return 0;
2404}
2405
2406/*
2407 * Free any local-format buffers sitting around before we reset to
2408 * extents format.
2409 */
2410static inline void
2411xfs_ifree_local_data(
2412 struct xfs_inode *ip,
2413 int whichfork)
2414{
2415 struct xfs_ifork *ifp;
2416
2417 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
2418 return;
2419
2420 ifp = XFS_IFORK_PTR(ip, whichfork);
2421 xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
2422}
2423
2424/*
2425 * This is called to return an inode to the inode free list.
2426 * The inode should already be truncated to 0 length and have
2427 * no pages associated with it. This routine also assumes that
2428 * the inode is already a part of the transaction.
2429 *
2430 * The on-disk copy of the inode will have been added to the list
2431 * of unlinked inodes in the AGI. We need to remove the inode from
2432 * that list atomically with respect to freeing it here.
2433 */
2434int
2435xfs_ifree(
2436 xfs_trans_t *tp,
2437 xfs_inode_t *ip,
2438 struct xfs_defer_ops *dfops)
2439{
2440 int error;
2441 struct xfs_icluster xic = { 0 };
2442
2443 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
2444 ASSERT(VFS_I(ip)->i_nlink == 0);
2445 ASSERT(ip->i_d.di_nextents == 0);
2446 ASSERT(ip->i_d.di_anextents == 0);
2447 ASSERT(ip->i_d.di_size == 0 || !S_ISREG(VFS_I(ip)->i_mode));
2448 ASSERT(ip->i_d.di_nblocks == 0);
2449
2450 /*
2451 * Pull the on-disk inode from the AGI unlinked list.
2452 */
2453 error = xfs_iunlink_remove(tp, ip);
2454 if (error)
2455 return error;
2456
2457 error = xfs_difree(tp, ip->i_ino, dfops, &xic);
2458 if (error)
2459 return error;
2460
2461 xfs_ifree_local_data(ip, XFS_DATA_FORK);
2462 xfs_ifree_local_data(ip, XFS_ATTR_FORK);
2463
2464 VFS_I(ip)->i_mode = 0; /* mark incore inode as free */
2465 ip->i_d.di_flags = 0;
2466 ip->i_d.di_flags2 = 0;
2467 ip->i_d.di_dmevmask = 0;
2468 ip->i_d.di_forkoff = 0; /* mark the attr fork not in use */
2469 ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS;
2470 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
2471
2472 /* Don't attempt to replay owner changes for a deleted inode */
2473 ip->i_itemp->ili_fields &= ~(XFS_ILOG_AOWNER|XFS_ILOG_DOWNER);
2474
2475 /*
2476 * Bump the generation count so no one will be confused
2477 * by reincarnations of this inode.
2478 */
2479 VFS_I(ip)->i_generation++;
2480 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
2481
2482 if (xic.deleted)
2483 error = xfs_ifree_cluster(ip, tp, &xic);
2484
2485 return error;
2486}
2487
2488/*
2489 * This is called to unpin an inode. The caller must have the inode locked
2490 * in at least shared mode so that the buffer cannot be subsequently pinned
2491 * once someone is waiting for it to be unpinned.
2492 */
2493static void
2494xfs_iunpin(
2495 struct xfs_inode *ip)
2496{
2497 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
2498
2499 trace_xfs_inode_unpin_nowait(ip, _RET_IP_);
2500
2501 /* Give the log a push to start the unpinning I/O */
2502 xfs_log_force_lsn(ip->i_mount, ip->i_itemp->ili_last_lsn, 0, NULL);
2503
2504}
2505
2506static void
2507__xfs_iunpin_wait(
2508 struct xfs_inode *ip)
2509{
2510 wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IPINNED_BIT);
2511 DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IPINNED_BIT);
2512
2513 xfs_iunpin(ip);
2514
2515 do {
2516 prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
2517 if (xfs_ipincount(ip))
2518 io_schedule();
2519 } while (xfs_ipincount(ip));
2520 finish_wait(wq, &wait.wq_entry);
2521}
2522
2523void
2524xfs_iunpin_wait(
2525 struct xfs_inode *ip)
2526{
2527 if (xfs_ipincount(ip))
2528 __xfs_iunpin_wait(ip);
2529}
2530
2531/*
2532 * Removing an inode from the namespace involves removing the directory entry
2533 * and dropping the link count on the inode. Removing the directory entry can
2534 * result in locking an AGF (directory blocks were freed) and removing a link
2535 * count can result in placing the inode on an unlinked list which results in
2536 * locking an AGI.
2537 *
2538 * The big problem here is that we have an ordering constraint on AGF and AGI
2539 * locking - inode allocation locks the AGI, then can allocate a new extent for
2540 * new inodes, locking the AGF after the AGI. Similarly, freeing the inode
2541 * removes the inode from the unlinked list, requiring that we lock the AGI
2542 * first, and then freeing the inode can result in an inode chunk being freed
2543 * and hence freeing disk space requiring that we lock an AGF.
2544 *
2545 * Hence the ordering that is imposed by other parts of the code is AGI before
2546 * AGF. This means we cannot remove the directory entry before we drop the inode
2547 * reference count and put it on the unlinked list as this results in a lock
2548 * order of AGF then AGI, and this can deadlock against inode allocation and
2549 * freeing. Therefore we must drop the link counts before we remove the
2550 * directory entry.
2551 *
2552 * This is still safe from a transactional point of view - it is not until we
2553 * get to xfs_defer_finish() that we have the possibility of multiple
2554 * transactions in this operation. Hence as long as we remove the directory
2555 * entry and drop the link count in the first transaction of the remove
2556 * operation, there are no transactional constraints on the ordering here.
2557 */
2558int
2559xfs_remove(
2560 xfs_inode_t *dp,
2561 struct xfs_name *name,
2562 xfs_inode_t *ip)
2563{
2564 xfs_mount_t *mp = dp->i_mount;
2565 xfs_trans_t *tp = NULL;
2566 int is_dir = S_ISDIR(VFS_I(ip)->i_mode);
2567 int error = 0;
2568 struct xfs_defer_ops dfops;
2569 xfs_fsblock_t first_block;
2570 uint resblks;
2571
2572 trace_xfs_remove(dp, name);
2573
2574 if (XFS_FORCED_SHUTDOWN(mp))
2575 return -EIO;
2576
2577 error = xfs_qm_dqattach(dp, 0);
2578 if (error)
2579 goto std_return;
2580
2581 error = xfs_qm_dqattach(ip, 0);
2582 if (error)
2583 goto std_return;
2584
2585 /*
2586 * We try to get the real space reservation first,
2587 * allowing for directory btree deletion(s) implying
2588 * possible bmap insert(s). If we can't get the space
2589 * reservation then we use 0 instead, and avoid the bmap
2590 * btree insert(s) in the directory code by, if the bmap
2591 * insert tries to happen, instead trimming the LAST
2592 * block from the directory.
2593 */
2594 resblks = XFS_REMOVE_SPACE_RES(mp);
2595 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_remove, resblks, 0, 0, &tp);
2596 if (error == -ENOSPC) {
2597 resblks = 0;
2598 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_remove, 0, 0, 0,
2599 &tp);
2600 }
2601 if (error) {
2602 ASSERT(error != -ENOSPC);
2603 goto std_return;
2604 }
2605
2606 xfs_lock_two_inodes(dp, XFS_ILOCK_EXCL, ip, XFS_ILOCK_EXCL);
2607
2608 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
2609 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
2610
2611 /*
2612 * If we're removing a directory perform some additional validation.
2613 */
2614 if (is_dir) {
2615 ASSERT(VFS_I(ip)->i_nlink >= 2);
2616 if (VFS_I(ip)->i_nlink != 2) {
2617 error = -ENOTEMPTY;
2618 goto out_trans_cancel;
2619 }
2620 if (!xfs_dir_isempty(ip)) {
2621 error = -ENOTEMPTY;
2622 goto out_trans_cancel;
2623 }
2624
2625 /* Drop the link from ip's "..". */
2626 error = xfs_droplink(tp, dp);
2627 if (error)
2628 goto out_trans_cancel;
2629
2630 /* Drop the "." link from ip to self. */
2631 error = xfs_droplink(tp, ip);
2632 if (error)
2633 goto out_trans_cancel;
2634 } else {
2635 /*
2636 * When removing a non-directory we need to log the parent
2637 * inode here. For a directory this is done implicitly
2638 * by the xfs_droplink call for the ".." entry.
2639 */
2640 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
2641 }
2642 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2643
2644 /* Drop the link from dp to ip. */
2645 error = xfs_droplink(tp, ip);
2646 if (error)
2647 goto out_trans_cancel;
2648
2649 xfs_defer_init(&dfops, &first_block);
2650 error = xfs_dir_removename(tp, dp, name, ip->i_ino,
2651 &first_block, &dfops, resblks);
2652 if (error) {
2653 ASSERT(error != -ENOENT);
2654 goto out_bmap_cancel;
2655 }
2656
2657 /*
2658 * If this is a synchronous mount, make sure that the
2659 * remove transaction goes to disk before returning to
2660 * the user.
2661 */
2662 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
2663 xfs_trans_set_sync(tp);
2664
2665 error = xfs_defer_finish(&tp, &dfops);
2666 if (error)
2667 goto out_bmap_cancel;
2668
2669 error = xfs_trans_commit(tp);
2670 if (error)
2671 goto std_return;
2672
2673 if (is_dir && xfs_inode_is_filestream(ip))
2674 xfs_filestream_deassociate(ip);
2675
2676 return 0;
2677
2678 out_bmap_cancel:
2679 xfs_defer_cancel(&dfops);
2680 out_trans_cancel:
2681 xfs_trans_cancel(tp);
2682 std_return:
2683 return error;
2684}
2685
2686/*
2687 * Enter all inodes for a rename transaction into a sorted array.
2688 */
2689#define __XFS_SORT_INODES 5
2690STATIC void
2691xfs_sort_for_rename(
2692 struct xfs_inode *dp1, /* in: old (source) directory inode */
2693 struct xfs_inode *dp2, /* in: new (target) directory inode */
2694 struct xfs_inode *ip1, /* in: inode of old entry */
2695 struct xfs_inode *ip2, /* in: inode of new entry */
2696 struct xfs_inode *wip, /* in: whiteout inode */
2697 struct xfs_inode **i_tab,/* out: sorted array of inodes */
2698 int *num_inodes) /* in/out: inodes in array */
2699{
2700 int i, j;
2701
2702 ASSERT(*num_inodes == __XFS_SORT_INODES);
2703 memset(i_tab, 0, *num_inodes * sizeof(struct xfs_inode *));
2704
2705 /*
2706 * i_tab contains a list of pointers to inodes. We initialize
2707 * the table here & we'll sort it. We will then use it to
2708 * order the acquisition of the inode locks.
2709 *
2710 * Note that the table may contain duplicates. e.g., dp1 == dp2.
2711 */
2712 i = 0;
2713 i_tab[i++] = dp1;
2714 i_tab[i++] = dp2;
2715 i_tab[i++] = ip1;
2716 if (ip2)
2717 i_tab[i++] = ip2;
2718 if (wip)
2719 i_tab[i++] = wip;
2720 *num_inodes = i;
2721
2722 /*
2723 * Sort the elements via bubble sort. (Remember, there are at
2724 * most 5 elements to sort, so this is adequate.)
2725 */
2726 for (i = 0; i < *num_inodes; i++) {
2727 for (j = 1; j < *num_inodes; j++) {
2728 if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
2729 struct xfs_inode *temp = i_tab[j];
2730 i_tab[j] = i_tab[j-1];
2731 i_tab[j-1] = temp;
2732 }
2733 }
2734 }
2735}
2736
2737static int
2738xfs_finish_rename(
2739 struct xfs_trans *tp,
2740 struct xfs_defer_ops *dfops)
2741{
2742 int error;
2743
2744 /*
2745 * If this is a synchronous mount, make sure that the rename transaction
2746 * goes to disk before returning to the user.
2747 */
2748 if (tp->t_mountp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
2749 xfs_trans_set_sync(tp);
2750
2751 error = xfs_defer_finish(&tp, dfops);
2752 if (error) {
2753 xfs_defer_cancel(dfops);
2754 xfs_trans_cancel(tp);
2755 return error;
2756 }
2757
2758 return xfs_trans_commit(tp);
2759}
2760
2761/*
2762 * xfs_cross_rename()
2763 *
2764 * responsible for handling RENAME_EXCHANGE flag in renameat2() sytemcall
2765 */
2766STATIC int
2767xfs_cross_rename(
2768 struct xfs_trans *tp,
2769 struct xfs_inode *dp1,
2770 struct xfs_name *name1,
2771 struct xfs_inode *ip1,
2772 struct xfs_inode *dp2,
2773 struct xfs_name *name2,
2774 struct xfs_inode *ip2,
2775 struct xfs_defer_ops *dfops,
2776 xfs_fsblock_t *first_block,
2777 int spaceres)
2778{
2779 int error = 0;
2780 int ip1_flags = 0;
2781 int ip2_flags = 0;
2782 int dp2_flags = 0;
2783
2784 /* Swap inode number for dirent in first parent */
2785 error = xfs_dir_replace(tp, dp1, name1,
2786 ip2->i_ino,
2787 first_block, dfops, spaceres);
2788 if (error)
2789 goto out_trans_abort;
2790
2791 /* Swap inode number for dirent in second parent */
2792 error = xfs_dir_replace(tp, dp2, name2,
2793 ip1->i_ino,
2794 first_block, dfops, spaceres);
2795 if (error)
2796 goto out_trans_abort;
2797
2798 /*
2799 * If we're renaming one or more directories across different parents,
2800 * update the respective ".." entries (and link counts) to match the new
2801 * parents.
2802 */
2803 if (dp1 != dp2) {
2804 dp2_flags = XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
2805
2806 if (S_ISDIR(VFS_I(ip2)->i_mode)) {
2807 error = xfs_dir_replace(tp, ip2, &xfs_name_dotdot,
2808 dp1->i_ino, first_block,
2809 dfops, spaceres);
2810 if (error)
2811 goto out_trans_abort;
2812
2813 /* transfer ip2 ".." reference to dp1 */
2814 if (!S_ISDIR(VFS_I(ip1)->i_mode)) {
2815 error = xfs_droplink(tp, dp2);
2816 if (error)
2817 goto out_trans_abort;
2818 error = xfs_bumplink(tp, dp1);
2819 if (error)
2820 goto out_trans_abort;
2821 }
2822
2823 /*
2824 * Although ip1 isn't changed here, userspace needs
2825 * to be warned about the change, so that applications
2826 * relying on it (like backup ones), will properly
2827 * notify the change
2828 */
2829 ip1_flags |= XFS_ICHGTIME_CHG;
2830 ip2_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
2831 }
2832
2833 if (S_ISDIR(VFS_I(ip1)->i_mode)) {
2834 error = xfs_dir_replace(tp, ip1, &xfs_name_dotdot,
2835 dp2->i_ino, first_block,
2836 dfops, spaceres);
2837 if (error)
2838 goto out_trans_abort;
2839
2840 /* transfer ip1 ".." reference to dp2 */
2841 if (!S_ISDIR(VFS_I(ip2)->i_mode)) {
2842 error = xfs_droplink(tp, dp1);
2843 if (error)
2844 goto out_trans_abort;
2845 error = xfs_bumplink(tp, dp2);
2846 if (error)
2847 goto out_trans_abort;
2848 }
2849
2850 /*
2851 * Although ip2 isn't changed here, userspace needs
2852 * to be warned about the change, so that applications
2853 * relying on it (like backup ones), will properly
2854 * notify the change
2855 */
2856 ip1_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
2857 ip2_flags |= XFS_ICHGTIME_CHG;
2858 }
2859 }
2860
2861 if (ip1_flags) {
2862 xfs_trans_ichgtime(tp, ip1, ip1_flags);
2863 xfs_trans_log_inode(tp, ip1, XFS_ILOG_CORE);
2864 }
2865 if (ip2_flags) {
2866 xfs_trans_ichgtime(tp, ip2, ip2_flags);
2867 xfs_trans_log_inode(tp, ip2, XFS_ILOG_CORE);
2868 }
2869 if (dp2_flags) {
2870 xfs_trans_ichgtime(tp, dp2, dp2_flags);
2871 xfs_trans_log_inode(tp, dp2, XFS_ILOG_CORE);
2872 }
2873 xfs_trans_ichgtime(tp, dp1, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2874 xfs_trans_log_inode(tp, dp1, XFS_ILOG_CORE);
2875 return xfs_finish_rename(tp, dfops);
2876
2877out_trans_abort:
2878 xfs_defer_cancel(dfops);
2879 xfs_trans_cancel(tp);
2880 return error;
2881}
2882
2883/*
2884 * xfs_rename_alloc_whiteout()
2885 *
2886 * Return a referenced, unlinked, unlocked inode that that can be used as a
2887 * whiteout in a rename transaction. We use a tmpfile inode here so that if we
2888 * crash between allocating the inode and linking it into the rename transaction
2889 * recovery will free the inode and we won't leak it.
2890 */
2891static int
2892xfs_rename_alloc_whiteout(
2893 struct xfs_inode *dp,
2894 struct xfs_inode **wip)
2895{
2896 struct xfs_inode *tmpfile;
2897 int error;
2898
2899 error = xfs_create_tmpfile(dp, S_IFCHR | WHITEOUT_MODE, &tmpfile);
2900 if (error)
2901 return error;
2902
2903 /*
2904 * Prepare the tmpfile inode as if it were created through the VFS.
2905 * Otherwise, the link increment paths will complain about nlink 0->1.
2906 * Drop the link count as done by d_tmpfile(), complete the inode setup
2907 * and flag it as linkable.
2908 */
2909 drop_nlink(VFS_I(tmpfile));
2910 xfs_setup_iops(tmpfile);
2911 xfs_finish_inode_setup(tmpfile);
2912 VFS_I(tmpfile)->i_state |= I_LINKABLE;
2913
2914 *wip = tmpfile;
2915 return 0;
2916}
2917
2918/*
2919 * xfs_rename
2920 */
2921int
2922xfs_rename(
2923 struct xfs_inode *src_dp,
2924 struct xfs_name *src_name,
2925 struct xfs_inode *src_ip,
2926 struct xfs_inode *target_dp,
2927 struct xfs_name *target_name,
2928 struct xfs_inode *target_ip,
2929 unsigned int flags)
2930{
2931 struct xfs_mount *mp = src_dp->i_mount;
2932 struct xfs_trans *tp;
2933 struct xfs_defer_ops dfops;
2934 xfs_fsblock_t first_block;
2935 struct xfs_inode *wip = NULL; /* whiteout inode */
2936 struct xfs_inode *inodes[__XFS_SORT_INODES];
2937 int num_inodes = __XFS_SORT_INODES;
2938 bool new_parent = (src_dp != target_dp);
2939 bool src_is_directory = S_ISDIR(VFS_I(src_ip)->i_mode);
2940 int spaceres;
2941 int error;
2942
2943 trace_xfs_rename(src_dp, target_dp, src_name, target_name);
2944
2945 if ((flags & RENAME_EXCHANGE) && !target_ip)
2946 return -EINVAL;
2947
2948 /*
2949 * If we are doing a whiteout operation, allocate the whiteout inode
2950 * we will be placing at the target and ensure the type is set
2951 * appropriately.
2952 */
2953 if (flags & RENAME_WHITEOUT) {
2954 ASSERT(!(flags & (RENAME_NOREPLACE | RENAME_EXCHANGE)));
2955 error = xfs_rename_alloc_whiteout(target_dp, &wip);
2956 if (error)
2957 return error;
2958
2959 /* setup target dirent info as whiteout */
2960 src_name->type = XFS_DIR3_FT_CHRDEV;
2961 }
2962
2963 xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip, wip,
2964 inodes, &num_inodes);
2965
2966 spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
2967 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_rename, spaceres, 0, 0, &tp);
2968 if (error == -ENOSPC) {
2969 spaceres = 0;
2970 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_rename, 0, 0, 0,
2971 &tp);
2972 }
2973 if (error)
2974 goto out_release_wip;
2975
2976 /*
2977 * Attach the dquots to the inodes
2978 */
2979 error = xfs_qm_vop_rename_dqattach(inodes);
2980 if (error)
2981 goto out_trans_cancel;
2982
2983 /*
2984 * Lock all the participating inodes. Depending upon whether
2985 * the target_name exists in the target directory, and
2986 * whether the target directory is the same as the source
2987 * directory, we can lock from 2 to 4 inodes.
2988 */
2989 xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
2990
2991 /*
2992 * Join all the inodes to the transaction. From this point on,
2993 * we can rely on either trans_commit or trans_cancel to unlock
2994 * them.
2995 */
2996 xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
2997 if (new_parent)
2998 xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
2999 xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
3000 if (target_ip)
3001 xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
3002 if (wip)
3003 xfs_trans_ijoin(tp, wip, XFS_ILOCK_EXCL);
3004
3005 /*
3006 * If we are using project inheritance, we only allow renames
3007 * into our tree when the project IDs are the same; else the
3008 * tree quota mechanism would be circumvented.
3009 */
3010 if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
3011 (xfs_get_projid(target_dp) != xfs_get_projid(src_ip)))) {
3012 error = -EXDEV;
3013 goto out_trans_cancel;
3014 }
3015
3016 xfs_defer_init(&dfops, &first_block);
3017
3018 /* RENAME_EXCHANGE is unique from here on. */
3019 if (flags & RENAME_EXCHANGE)
3020 return xfs_cross_rename(tp, src_dp, src_name, src_ip,
3021 target_dp, target_name, target_ip,
3022 &dfops, &first_block, spaceres);
3023
3024 /*
3025 * Set up the target.
3026 */
3027 if (target_ip == NULL) {
3028 /*
3029 * If there's no space reservation, check the entry will
3030 * fit before actually inserting it.
3031 */
3032 if (!spaceres) {
3033 error = xfs_dir_canenter(tp, target_dp, target_name);
3034 if (error)
3035 goto out_trans_cancel;
3036 }
3037 /*
3038 * If target does not exist and the rename crosses
3039 * directories, adjust the target directory link count
3040 * to account for the ".." reference from the new entry.
3041 */
3042 error = xfs_dir_createname(tp, target_dp, target_name,
3043 src_ip->i_ino, &first_block,
3044 &dfops, spaceres);
3045 if (error)
3046 goto out_bmap_cancel;
3047
3048 xfs_trans_ichgtime(tp, target_dp,
3049 XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
3050
3051 if (new_parent && src_is_directory) {
3052 error = xfs_bumplink(tp, target_dp);
3053 if (error)
3054 goto out_bmap_cancel;
3055 }
3056 } else { /* target_ip != NULL */
3057 /*
3058 * If target exists and it's a directory, check that both
3059 * target and source are directories and that target can be
3060 * destroyed, or that neither is a directory.
3061 */
3062 if (S_ISDIR(VFS_I(target_ip)->i_mode)) {
3063 /*
3064 * Make sure target dir is empty.
3065 */
3066 if (!(xfs_dir_isempty(target_ip)) ||
3067 (VFS_I(target_ip)->i_nlink > 2)) {
3068 error = -EEXIST;
3069 goto out_trans_cancel;
3070 }
3071 }
3072
3073 /*
3074 * Link the source inode under the target name.
3075 * If the source inode is a directory and we are moving
3076 * it across directories, its ".." entry will be
3077 * inconsistent until we replace that down below.
3078 *
3079 * In case there is already an entry with the same
3080 * name at the destination directory, remove it first.
3081 */
3082 error = xfs_dir_replace(tp, target_dp, target_name,
3083 src_ip->i_ino,
3084 &first_block, &dfops, spaceres);
3085 if (error)
3086 goto out_bmap_cancel;
3087
3088 xfs_trans_ichgtime(tp, target_dp,
3089 XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
3090
3091 /*
3092 * Decrement the link count on the target since the target
3093 * dir no longer points to it.
3094 */
3095 error = xfs_droplink(tp, target_ip);
3096 if (error)
3097 goto out_bmap_cancel;
3098
3099 if (src_is_directory) {
3100 /*
3101 * Drop the link from the old "." entry.
3102 */
3103 error = xfs_droplink(tp, target_ip);
3104 if (error)
3105 goto out_bmap_cancel;
3106 }
3107 } /* target_ip != NULL */
3108
3109 /*
3110 * Remove the source.
3111 */
3112 if (new_parent && src_is_directory) {
3113 /*
3114 * Rewrite the ".." entry to point to the new
3115 * directory.
3116 */
3117 error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
3118 target_dp->i_ino,
3119 &first_block, &dfops, spaceres);
3120 ASSERT(error != -EEXIST);
3121 if (error)
3122 goto out_bmap_cancel;
3123 }
3124
3125 /*
3126 * We always want to hit the ctime on the source inode.
3127 *
3128 * This isn't strictly required by the standards since the source
3129 * inode isn't really being changed, but old unix file systems did
3130 * it and some incremental backup programs won't work without it.
3131 */
3132 xfs_trans_ichgtime(tp, src_ip, XFS_ICHGTIME_CHG);
3133 xfs_trans_log_inode(tp, src_ip, XFS_ILOG_CORE);
3134
3135 /*
3136 * Adjust the link count on src_dp. This is necessary when
3137 * renaming a directory, either within one parent when
3138 * the target existed, or across two parent directories.
3139 */
3140 if (src_is_directory && (new_parent || target_ip != NULL)) {
3141
3142 /*
3143 * Decrement link count on src_directory since the
3144 * entry that's moved no longer points to it.
3145 */
3146 error = xfs_droplink(tp, src_dp);
3147 if (error)
3148 goto out_bmap_cancel;
3149 }
3150
3151 /*
3152 * For whiteouts, we only need to update the source dirent with the
3153 * inode number of the whiteout inode rather than removing it
3154 * altogether.
3155 */
3156 if (wip) {
3157 error = xfs_dir_replace(tp, src_dp, src_name, wip->i_ino,
3158 &first_block, &dfops, spaceres);
3159 } else
3160 error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
3161 &first_block, &dfops, spaceres);
3162 if (error)
3163 goto out_bmap_cancel;
3164
3165 /*
3166 * For whiteouts, we need to bump the link count on the whiteout inode.
3167 * This means that failures all the way up to this point leave the inode
3168 * on the unlinked list and so cleanup is a simple matter of dropping
3169 * the remaining reference to it. If we fail here after bumping the link
3170 * count, we're shutting down the filesystem so we'll never see the
3171 * intermediate state on disk.
3172 */
3173 if (wip) {
3174 ASSERT(VFS_I(wip)->i_nlink == 0);
3175 error = xfs_bumplink(tp, wip);
3176 if (error)
3177 goto out_bmap_cancel;
3178 error = xfs_iunlink_remove(tp, wip);
3179 if (error)
3180 goto out_bmap_cancel;
3181 xfs_trans_log_inode(tp, wip, XFS_ILOG_CORE);
3182
3183 /*
3184 * Now we have a real link, clear the "I'm a tmpfile" state
3185 * flag from the inode so it doesn't accidentally get misused in
3186 * future.
3187 */
3188 VFS_I(wip)->i_state &= ~I_LINKABLE;
3189 }
3190
3191 xfs_trans_ichgtime(tp, src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
3192 xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
3193 if (new_parent)
3194 xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
3195
3196 error = xfs_finish_rename(tp, &dfops);
3197 if (wip)
3198 IRELE(wip);
3199 return error;
3200
3201out_bmap_cancel:
3202 xfs_defer_cancel(&dfops);
3203out_trans_cancel:
3204 xfs_trans_cancel(tp);
3205out_release_wip:
3206 if (wip)
3207 IRELE(wip);
3208 return error;
3209}
3210
3211STATIC int
3212xfs_iflush_cluster(
3213 struct xfs_inode *ip,
3214 struct xfs_buf *bp)
3215{
3216 struct xfs_mount *mp = ip->i_mount;
3217 struct xfs_perag *pag;
3218 unsigned long first_index, mask;
3219 unsigned long inodes_per_cluster;
3220 int cilist_size;
3221 struct xfs_inode **cilist;
3222 struct xfs_inode *cip;
3223 int nr_found;
3224 int clcount = 0;
3225 int bufwasdelwri;
3226 int i;
3227
3228 pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
3229
3230 inodes_per_cluster = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
3231 cilist_size = inodes_per_cluster * sizeof(xfs_inode_t *);
3232 cilist = kmem_alloc(cilist_size, KM_MAYFAIL|KM_NOFS);
3233 if (!cilist)
3234 goto out_put;
3235
3236 mask = ~(((mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog)) - 1);
3237 first_index = XFS_INO_TO_AGINO(mp, ip->i_ino) & mask;
3238 rcu_read_lock();
3239 /* really need a gang lookup range call here */
3240 nr_found = radix_tree_gang_lookup(&pag->pag_ici_root, (void**)cilist,
3241 first_index, inodes_per_cluster);
3242 if (nr_found == 0)
3243 goto out_free;
3244
3245 for (i = 0; i < nr_found; i++) {
3246 cip = cilist[i];
3247 if (cip == ip)
3248 continue;
3249
3250 /*
3251 * because this is an RCU protected lookup, we could find a
3252 * recently freed or even reallocated inode during the lookup.
3253 * We need to check under the i_flags_lock for a valid inode
3254 * here. Skip it if it is not valid or the wrong inode.
3255 */
3256 spin_lock(&cip->i_flags_lock);
3257 if (!cip->i_ino ||
3258 __xfs_iflags_test(cip, XFS_ISTALE)) {
3259 spin_unlock(&cip->i_flags_lock);
3260 continue;
3261 }
3262
3263 /*
3264 * Once we fall off the end of the cluster, no point checking
3265 * any more inodes in the list because they will also all be
3266 * outside the cluster.
3267 */
3268 if ((XFS_INO_TO_AGINO(mp, cip->i_ino) & mask) != first_index) {
3269 spin_unlock(&cip->i_flags_lock);
3270 break;
3271 }
3272 spin_unlock(&cip->i_flags_lock);
3273
3274 /*
3275 * Do an un-protected check to see if the inode is dirty and
3276 * is a candidate for flushing. These checks will be repeated
3277 * later after the appropriate locks are acquired.
3278 */
3279 if (xfs_inode_clean(cip) && xfs_ipincount(cip) == 0)
3280 continue;
3281
3282 /*
3283 * Try to get locks. If any are unavailable or it is pinned,
3284 * then this inode cannot be flushed and is skipped.
3285 */
3286
3287 if (!xfs_ilock_nowait(cip, XFS_ILOCK_SHARED))
3288 continue;
3289 if (!xfs_iflock_nowait(cip)) {
3290 xfs_iunlock(cip, XFS_ILOCK_SHARED);
3291 continue;
3292 }
3293 if (xfs_ipincount(cip)) {
3294 xfs_ifunlock(cip);
3295 xfs_iunlock(cip, XFS_ILOCK_SHARED);
3296 continue;
3297 }
3298
3299
3300 /*
3301 * Check the inode number again, just to be certain we are not
3302 * racing with freeing in xfs_reclaim_inode(). See the comments
3303 * in that function for more information as to why the initial
3304 * check is not sufficient.
3305 */
3306 if (!cip->i_ino) {
3307 xfs_ifunlock(cip);
3308 xfs_iunlock(cip, XFS_ILOCK_SHARED);
3309 continue;
3310 }
3311
3312 /*
3313 * arriving here means that this inode can be flushed. First
3314 * re-check that it's dirty before flushing.
3315 */
3316 if (!xfs_inode_clean(cip)) {
3317 int error;
3318 error = xfs_iflush_int(cip, bp);
3319 if (error) {
3320 xfs_iunlock(cip, XFS_ILOCK_SHARED);
3321 goto cluster_corrupt_out;
3322 }
3323 clcount++;
3324 } else {
3325 xfs_ifunlock(cip);
3326 }
3327 xfs_iunlock(cip, XFS_ILOCK_SHARED);
3328 }
3329
3330 if (clcount) {
3331 XFS_STATS_INC(mp, xs_icluster_flushcnt);
3332 XFS_STATS_ADD(mp, xs_icluster_flushinode, clcount);
3333 }
3334
3335out_free:
3336 rcu_read_unlock();
3337 kmem_free(cilist);
3338out_put:
3339 xfs_perag_put(pag);
3340 return 0;
3341
3342
3343cluster_corrupt_out:
3344 /*
3345 * Corruption detected in the clustering loop. Invalidate the
3346 * inode buffer and shut down the filesystem.
3347 */
3348 rcu_read_unlock();
3349 /*
3350 * Clean up the buffer. If it was delwri, just release it --
3351 * brelse can handle it with no problems. If not, shut down the
3352 * filesystem before releasing the buffer.
3353 */
3354 bufwasdelwri = (bp->b_flags & _XBF_DELWRI_Q);
3355 if (bufwasdelwri)
3356 xfs_buf_relse(bp);
3357
3358 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
3359
3360 if (!bufwasdelwri) {
3361 /*
3362 * Just like incore_relse: if we have b_iodone functions,
3363 * mark the buffer as an error and call them. Otherwise
3364 * mark it as stale and brelse.
3365 */
3366 if (bp->b_iodone) {
3367 bp->b_flags &= ~XBF_DONE;
3368 xfs_buf_stale(bp);
3369 xfs_buf_ioerror(bp, -EIO);
3370 xfs_buf_ioend(bp);
3371 } else {
3372 xfs_buf_stale(bp);
3373 xfs_buf_relse(bp);
3374 }
3375 }
3376
3377 /*
3378 * Unlocks the flush lock
3379 */
3380 xfs_iflush_abort(cip, false);
3381 kmem_free(cilist);
3382 xfs_perag_put(pag);
3383 return -EFSCORRUPTED;
3384}
3385
3386/*
3387 * Flush dirty inode metadata into the backing buffer.
3388 *
3389 * The caller must have the inode lock and the inode flush lock held. The
3390 * inode lock will still be held upon return to the caller, and the inode
3391 * flush lock will be released after the inode has reached the disk.
3392 *
3393 * The caller must write out the buffer returned in *bpp and release it.
3394 */
3395int
3396xfs_iflush(
3397 struct xfs_inode *ip,
3398 struct xfs_buf **bpp)
3399{
3400 struct xfs_mount *mp = ip->i_mount;
3401 struct xfs_buf *bp = NULL;
3402 struct xfs_dinode *dip;
3403 int error;
3404
3405 XFS_STATS_INC(mp, xs_iflush_count);
3406
3407 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
3408 ASSERT(xfs_isiflocked(ip));
3409 ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
3410 ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK));
3411
3412 *bpp = NULL;
3413
3414 xfs_iunpin_wait(ip);
3415
3416 /*
3417 * For stale inodes we cannot rely on the backing buffer remaining
3418 * stale in cache for the remaining life of the stale inode and so
3419 * xfs_imap_to_bp() below may give us a buffer that no longer contains
3420 * inodes below. We have to check this after ensuring the inode is
3421 * unpinned so that it is safe to reclaim the stale inode after the
3422 * flush call.
3423 */
3424 if (xfs_iflags_test(ip, XFS_ISTALE)) {
3425 xfs_ifunlock(ip);
3426 return 0;
3427 }
3428
3429 /*
3430 * This may have been unpinned because the filesystem is shutting
3431 * down forcibly. If that's the case we must not write this inode
3432 * to disk, because the log record didn't make it to disk.
3433 *
3434 * We also have to remove the log item from the AIL in this case,
3435 * as we wait for an empty AIL as part of the unmount process.
3436 */
3437 if (XFS_FORCED_SHUTDOWN(mp)) {
3438 error = -EIO;
3439 goto abort_out;
3440 }
3441
3442 /*
3443 * Get the buffer containing the on-disk inode. We are doing a try-lock
3444 * operation here, so we may get an EAGAIN error. In that case, we
3445 * simply want to return with the inode still dirty.
3446 *
3447 * If we get any other error, we effectively have a corruption situation
3448 * and we cannot flush the inode, so we treat it the same as failing
3449 * xfs_iflush_int().
3450 */
3451 error = xfs_imap_to_bp(mp, NULL, &ip->i_imap, &dip, &bp, XBF_TRYLOCK,
3452 0);
3453 if (error == -EAGAIN) {
3454 xfs_ifunlock(ip);
3455 return error;
3456 }
3457 if (error)
3458 goto corrupt_out;
3459
3460 /*
3461 * First flush out the inode that xfs_iflush was called with.
3462 */
3463 error = xfs_iflush_int(ip, bp);
3464 if (error)
3465 goto corrupt_out;
3466
3467 /*
3468 * If the buffer is pinned then push on the log now so we won't
3469 * get stuck waiting in the write for too long.
3470 */
3471 if (xfs_buf_ispinned(bp))
3472 xfs_log_force(mp, 0);
3473
3474 /*
3475 * inode clustering:
3476 * see if other inodes can be gathered into this write
3477 */
3478 error = xfs_iflush_cluster(ip, bp);
3479 if (error)
3480 goto cluster_corrupt_out;
3481
3482 *bpp = bp;
3483 return 0;
3484
3485corrupt_out:
3486 if (bp)
3487 xfs_buf_relse(bp);
3488 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
3489cluster_corrupt_out:
3490 error = -EFSCORRUPTED;
3491abort_out:
3492 /*
3493 * Unlocks the flush lock
3494 */
3495 xfs_iflush_abort(ip, false);
3496 return error;
3497}
3498
3499/*
3500 * If there are inline format data / attr forks attached to this inode,
3501 * make sure they're not corrupt.
3502 */
3503bool
3504xfs_inode_verify_forks(
3505 struct xfs_inode *ip)
3506{
3507 struct xfs_ifork *ifp;
3508 xfs_failaddr_t fa;
3509
3510 fa = xfs_ifork_verify_data(ip, &xfs_default_ifork_ops);
3511 if (fa) {
3512 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
3513 xfs_inode_verifier_error(ip, -EFSCORRUPTED, "data fork",
3514 ifp->if_u1.if_data, ifp->if_bytes, fa);
3515 return false;
3516 }
3517
3518 fa = xfs_ifork_verify_attr(ip, &xfs_default_ifork_ops);
3519 if (fa) {
3520 ifp = XFS_IFORK_PTR(ip, XFS_ATTR_FORK);
3521 xfs_inode_verifier_error(ip, -EFSCORRUPTED, "attr fork",
3522 ifp ? ifp->if_u1.if_data : NULL,
3523 ifp ? ifp->if_bytes : 0, fa);
3524 return false;
3525 }
3526 return true;
3527}
3528
3529STATIC int
3530xfs_iflush_int(
3531 struct xfs_inode *ip,
3532 struct xfs_buf *bp)
3533{
3534 struct xfs_inode_log_item *iip = ip->i_itemp;
3535 struct xfs_dinode *dip;
3536 struct xfs_mount *mp = ip->i_mount;
3537
3538 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
3539 ASSERT(xfs_isiflocked(ip));
3540 ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
3541 ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK));
3542 ASSERT(iip != NULL && iip->ili_fields != 0);
3543 ASSERT(ip->i_d.di_version > 1);
3544
3545 /* set *dip = inode's place in the buffer */
3546 dip = xfs_buf_offset(bp, ip->i_imap.im_boffset);
3547
3548 if (XFS_TEST_ERROR(dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC),
3549 mp, XFS_ERRTAG_IFLUSH_1)) {
3550 xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
3551 "%s: Bad inode %Lu magic number 0x%x, ptr "PTR_FMT,
3552 __func__, ip->i_ino, be16_to_cpu(dip->di_magic), dip);
3553 goto corrupt_out;
3554 }
3555 if (S_ISREG(VFS_I(ip)->i_mode)) {
3556 if (XFS_TEST_ERROR(
3557 (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) &&
3558 (ip->i_d.di_format != XFS_DINODE_FMT_BTREE),
3559 mp, XFS_ERRTAG_IFLUSH_3)) {
3560 xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
3561 "%s: Bad regular inode %Lu, ptr "PTR_FMT,
3562 __func__, ip->i_ino, ip);
3563 goto corrupt_out;
3564 }
3565 } else if (S_ISDIR(VFS_I(ip)->i_mode)) {
3566 if (XFS_TEST_ERROR(
3567 (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) &&
3568 (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
3569 (ip->i_d.di_format != XFS_DINODE_FMT_LOCAL),
3570 mp, XFS_ERRTAG_IFLUSH_4)) {
3571 xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
3572 "%s: Bad directory inode %Lu, ptr "PTR_FMT,
3573 __func__, ip->i_ino, ip);
3574 goto corrupt_out;
3575 }
3576 }
3577 if (XFS_TEST_ERROR(ip->i_d.di_nextents + ip->i_d.di_anextents >
3578 ip->i_d.di_nblocks, mp, XFS_ERRTAG_IFLUSH_5)) {
3579 xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
3580 "%s: detected corrupt incore inode %Lu, "
3581 "total extents = %d, nblocks = %Ld, ptr "PTR_FMT,
3582 __func__, ip->i_ino,
3583 ip->i_d.di_nextents + ip->i_d.di_anextents,
3584 ip->i_d.di_nblocks, ip);
3585 goto corrupt_out;
3586 }
3587 if (XFS_TEST_ERROR(ip->i_d.di_forkoff > mp->m_sb.sb_inodesize,
3588 mp, XFS_ERRTAG_IFLUSH_6)) {
3589 xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
3590 "%s: bad inode %Lu, forkoff 0x%x, ptr "PTR_FMT,
3591 __func__, ip->i_ino, ip->i_d.di_forkoff, ip);
3592 goto corrupt_out;
3593 }
3594
3595 /*
3596 * Inode item log recovery for v2 inodes are dependent on the
3597 * di_flushiter count for correct sequencing. We bump the flush
3598 * iteration count so we can detect flushes which postdate a log record
3599 * during recovery. This is redundant as we now log every change and
3600 * hence this can't happen but we need to still do it to ensure
3601 * backwards compatibility with old kernels that predate logging all
3602 * inode changes.
3603 */
3604 if (ip->i_d.di_version < 3)
3605 ip->i_d.di_flushiter++;
3606
3607 /* Check the inline fork data before we write out. */
3608 if (!xfs_inode_verify_forks(ip))
3609 goto corrupt_out;
3610
3611 /*
3612 * Copy the dirty parts of the inode into the on-disk inode. We always
3613 * copy out the core of the inode, because if the inode is dirty at all
3614 * the core must be.
3615 */
3616 xfs_inode_to_disk(ip, dip, iip->ili_item.li_lsn);
3617
3618 /* Wrap, we never let the log put out DI_MAX_FLUSH */
3619 if (ip->i_d.di_flushiter == DI_MAX_FLUSH)
3620 ip->i_d.di_flushiter = 0;
3621
3622 xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK);
3623 if (XFS_IFORK_Q(ip))
3624 xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK);
3625 xfs_inobp_check(mp, bp);
3626
3627 /*
3628 * We've recorded everything logged in the inode, so we'd like to clear
3629 * the ili_fields bits so we don't log and flush things unnecessarily.
3630 * However, we can't stop logging all this information until the data
3631 * we've copied into the disk buffer is written to disk. If we did we
3632 * might overwrite the copy of the inode in the log with all the data
3633 * after re-logging only part of it, and in the face of a crash we
3634 * wouldn't have all the data we need to recover.
3635 *
3636 * What we do is move the bits to the ili_last_fields field. When
3637 * logging the inode, these bits are moved back to the ili_fields field.
3638 * In the xfs_iflush_done() routine we clear ili_last_fields, since we
3639 * know that the information those bits represent is permanently on
3640 * disk. As long as the flush completes before the inode is logged
3641 * again, then both ili_fields and ili_last_fields will be cleared.
3642 *
3643 * We can play with the ili_fields bits here, because the inode lock
3644 * must be held exclusively in order to set bits there and the flush
3645 * lock protects the ili_last_fields bits. Set ili_logged so the flush
3646 * done routine can tell whether or not to look in the AIL. Also, store
3647 * the current LSN of the inode so that we can tell whether the item has
3648 * moved in the AIL from xfs_iflush_done(). In order to read the lsn we
3649 * need the AIL lock, because it is a 64 bit value that cannot be read
3650 * atomically.
3651 */
3652 iip->ili_last_fields = iip->ili_fields;
3653 iip->ili_fields = 0;
3654 iip->ili_fsync_fields = 0;
3655 iip->ili_logged = 1;
3656
3657 xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
3658 &iip->ili_item.li_lsn);
3659
3660 /*
3661 * Attach the function xfs_iflush_done to the inode's
3662 * buffer. This will remove the inode from the AIL
3663 * and unlock the inode's flush lock when the inode is
3664 * completely written to disk.
3665 */
3666 xfs_buf_attach_iodone(bp, xfs_iflush_done, &iip->ili_item);
3667
3668 /* generate the checksum. */
3669 xfs_dinode_calc_crc(mp, dip);
3670
3671 ASSERT(!list_empty(&bp->b_li_list));
3672 ASSERT(bp->b_iodone != NULL);
3673 return 0;
3674
3675corrupt_out:
3676 return -EFSCORRUPTED;
3677}
1/*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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
7 * published by the Free Software Foundation.
8 *
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.
13 *
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
17 */
18#include <linux/log2.h>
19
20#include "xfs.h"
21#include "xfs_fs.h"
22#include "xfs_shared.h"
23#include "xfs_format.h"
24#include "xfs_log_format.h"
25#include "xfs_trans_resv.h"
26#include "xfs_sb.h"
27#include "xfs_mount.h"
28#include "xfs_inode.h"
29#include "xfs_da_format.h"
30#include "xfs_da_btree.h"
31#include "xfs_dir2.h"
32#include "xfs_attr_sf.h"
33#include "xfs_attr.h"
34#include "xfs_trans_space.h"
35#include "xfs_trans.h"
36#include "xfs_buf_item.h"
37#include "xfs_inode_item.h"
38#include "xfs_ialloc.h"
39#include "xfs_bmap.h"
40#include "xfs_bmap_util.h"
41#include "xfs_error.h"
42#include "xfs_quota.h"
43#include "xfs_filestream.h"
44#include "xfs_cksum.h"
45#include "xfs_trace.h"
46#include "xfs_icache.h"
47#include "xfs_symlink.h"
48#include "xfs_trans_priv.h"
49#include "xfs_log.h"
50#include "xfs_bmap_btree.h"
51
52kmem_zone_t *xfs_inode_zone;
53
54/*
55 * Used in xfs_itruncate_extents(). This is the maximum number of extents
56 * freed from a file in a single transaction.
57 */
58#define XFS_ITRUNC_MAX_EXTENTS 2
59
60STATIC int xfs_iflush_int(struct xfs_inode *, struct xfs_buf *);
61STATIC int xfs_iunlink(struct xfs_trans *, struct xfs_inode *);
62STATIC int xfs_iunlink_remove(struct xfs_trans *, struct xfs_inode *);
63
64/*
65 * helper function to extract extent size hint from inode
66 */
67xfs_extlen_t
68xfs_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
78/*
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.
89 *
90 * The functions return a value which should be given to the corresponding
91 * xfs_iunlock() call.
92 */
93uint
94xfs_ilock_data_map_shared(
95 struct xfs_inode *ip)
96{
97 uint lock_mode = XFS_ILOCK_SHARED;
98
99 if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE &&
100 (ip->i_df.if_flags & XFS_IFEXTENTS) == 0)
101 lock_mode = XFS_ILOCK_EXCL;
102 xfs_ilock(ip, lock_mode);
103 return lock_mode;
104}
105
106uint
107xfs_ilock_attr_map_shared(
108 struct xfs_inode *ip)
109{
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;
117}
118
119/*
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.
123 *
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.
126 *
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).
148 */
149void
150xfs_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));
163 ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
164 (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
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_SUBCLASS_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
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
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 */
197int
198xfs_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));
211 ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
212 (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
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_SUBCLASS_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 }
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
233 if (lock_flags & XFS_ILOCK_EXCL) {
234 if (!mrtryupdate(&ip->i_lock))
235 goto out_undo_mmaplock;
236 } else if (lock_flags & XFS_ILOCK_SHARED) {
237 if (!mrtryaccess(&ip->i_lock))
238 goto out_undo_mmaplock;
239 }
240 return 1;
241
242out_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);
247out_undo_iolock:
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);
252out:
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 */
268void
269xfs_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));
280 ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
281 (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
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_SUBCLASS_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
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
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 */
309void
310xfs_ilock_demote(
311 xfs_inode_t *ip,
312 uint lock_flags)
313{
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);
317
318 if (lock_flags & XFS_ILOCK_EXCL)
319 mrdemote(&ip->i_lock);
320 if (lock_flags & XFS_MMAPLOCK_EXCL)
321 mrdemote(&ip->i_mmaplock);
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
328#if defined(DEBUG) || defined(XFS_WARN)
329int
330xfs_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
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
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
357#ifdef DEBUG
358int xfs_locked_n;
359int xfs_small_retries;
360int xfs_middle_retries;
361int xfs_lots_retries;
362int xfs_lock_delays;
363#endif
364
365/*
366 * xfs_lockdep_subclass_ok() is only used in an ASSERT, so is only called when
367 * DEBUG or XFS_WARN is set. And MAX_LOCKDEP_SUBCLASSES is then only defined
368 * when CONFIG_LOCKDEP is set. Hence the complex define below to avoid build
369 * errors and warnings.
370 */
371#if (defined(DEBUG) || defined(XFS_WARN)) && defined(CONFIG_LOCKDEP)
372static bool
373xfs_lockdep_subclass_ok(
374 int subclass)
375{
376 return subclass < MAX_LOCKDEP_SUBCLASSES;
377}
378#else
379#define xfs_lockdep_subclass_ok(subclass) (true)
380#endif
381
382/*
383 * Bump the subclass so xfs_lock_inodes() acquires each lock with a different
384 * value. This can be called for any type of inode lock combination, including
385 * parent locking. Care must be taken to ensure we don't overrun the subclass
386 * storage fields in the class mask we build.
387 */
388static inline int
389xfs_lock_inumorder(int lock_mode, int subclass)
390{
391 int class = 0;
392
393 ASSERT(!(lock_mode & (XFS_ILOCK_PARENT | XFS_ILOCK_RTBITMAP |
394 XFS_ILOCK_RTSUM)));
395 ASSERT(xfs_lockdep_subclass_ok(subclass));
396
397 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) {
398 ASSERT(subclass <= XFS_IOLOCK_MAX_SUBCLASS);
399 ASSERT(xfs_lockdep_subclass_ok(subclass +
400 XFS_IOLOCK_PARENT_VAL));
401 class += subclass << XFS_IOLOCK_SHIFT;
402 if (lock_mode & XFS_IOLOCK_PARENT)
403 class += XFS_IOLOCK_PARENT_VAL << XFS_IOLOCK_SHIFT;
404 }
405
406 if (lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) {
407 ASSERT(subclass <= XFS_MMAPLOCK_MAX_SUBCLASS);
408 class += subclass << XFS_MMAPLOCK_SHIFT;
409 }
410
411 if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) {
412 ASSERT(subclass <= XFS_ILOCK_MAX_SUBCLASS);
413 class += subclass << XFS_ILOCK_SHIFT;
414 }
415
416 return (lock_mode & ~XFS_LOCK_SUBCLASS_MASK) | class;
417}
418
419/*
420 * The following routine will lock n inodes in exclusive mode. We assume the
421 * caller calls us with the inodes in i_ino order.
422 *
423 * We need to detect deadlock where an inode that we lock is in the AIL and we
424 * start waiting for another inode that is locked by a thread in a long running
425 * transaction (such as truncate). This can result in deadlock since the long
426 * running trans might need to wait for the inode we just locked in order to
427 * push the tail and free space in the log.
428 *
429 * xfs_lock_inodes() can only be used to lock one type of lock at a time -
430 * the iolock, the mmaplock or the ilock, but not more than one at a time. If we
431 * lock more than one at a time, lockdep will report false positives saying we
432 * have violated locking orders.
433 */
434void
435xfs_lock_inodes(
436 xfs_inode_t **ips,
437 int inodes,
438 uint lock_mode)
439{
440 int attempts = 0, i, j, try_lock;
441 xfs_log_item_t *lp;
442
443 /*
444 * Currently supports between 2 and 5 inodes with exclusive locking. We
445 * support an arbitrary depth of locking here, but absolute limits on
446 * inodes depend on the the type of locking and the limits placed by
447 * lockdep annotations in xfs_lock_inumorder. These are all checked by
448 * the asserts.
449 */
450 ASSERT(ips && inodes >= 2 && inodes <= 5);
451 ASSERT(lock_mode & (XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL |
452 XFS_ILOCK_EXCL));
453 ASSERT(!(lock_mode & (XFS_IOLOCK_SHARED | XFS_MMAPLOCK_SHARED |
454 XFS_ILOCK_SHARED)));
455 ASSERT(!(lock_mode & XFS_IOLOCK_EXCL) ||
456 inodes <= XFS_IOLOCK_MAX_SUBCLASS + 1);
457 ASSERT(!(lock_mode & XFS_MMAPLOCK_EXCL) ||
458 inodes <= XFS_MMAPLOCK_MAX_SUBCLASS + 1);
459 ASSERT(!(lock_mode & XFS_ILOCK_EXCL) ||
460 inodes <= XFS_ILOCK_MAX_SUBCLASS + 1);
461
462 if (lock_mode & XFS_IOLOCK_EXCL) {
463 ASSERT(!(lock_mode & (XFS_MMAPLOCK_EXCL | XFS_ILOCK_EXCL)));
464 } else if (lock_mode & XFS_MMAPLOCK_EXCL)
465 ASSERT(!(lock_mode & XFS_ILOCK_EXCL));
466
467 try_lock = 0;
468 i = 0;
469again:
470 for (; i < inodes; i++) {
471 ASSERT(ips[i]);
472
473 if (i && (ips[i] == ips[i - 1])) /* Already locked */
474 continue;
475
476 /*
477 * If try_lock is not set yet, make sure all locked inodes are
478 * not in the AIL. If any are, set try_lock to be used later.
479 */
480 if (!try_lock) {
481 for (j = (i - 1); j >= 0 && !try_lock; j--) {
482 lp = (xfs_log_item_t *)ips[j]->i_itemp;
483 if (lp && (lp->li_flags & XFS_LI_IN_AIL))
484 try_lock++;
485 }
486 }
487
488 /*
489 * If any of the previous locks we have locked is in the AIL,
490 * we must TRY to get the second and subsequent locks. If
491 * we can't get any, we must release all we have
492 * and try again.
493 */
494 if (!try_lock) {
495 xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
496 continue;
497 }
498
499 /* try_lock means we have an inode locked that is in the AIL. */
500 ASSERT(i != 0);
501 if (xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i)))
502 continue;
503
504 /*
505 * Unlock all previous guys and try again. xfs_iunlock will try
506 * to push the tail if the inode is in the AIL.
507 */
508 attempts++;
509 for (j = i - 1; j >= 0; j--) {
510 /*
511 * Check to see if we've already unlocked this one. Not
512 * the first one going back, and the inode ptr is the
513 * same.
514 */
515 if (j != (i - 1) && ips[j] == ips[j + 1])
516 continue;
517
518 xfs_iunlock(ips[j], lock_mode);
519 }
520
521 if ((attempts % 5) == 0) {
522 delay(1); /* Don't just spin the CPU */
523#ifdef DEBUG
524 xfs_lock_delays++;
525#endif
526 }
527 i = 0;
528 try_lock = 0;
529 goto again;
530 }
531
532#ifdef DEBUG
533 if (attempts) {
534 if (attempts < 5) xfs_small_retries++;
535 else if (attempts < 100) xfs_middle_retries++;
536 else xfs_lots_retries++;
537 } else {
538 xfs_locked_n++;
539 }
540#endif
541}
542
543/*
544 * xfs_lock_two_inodes() can only be used to lock one type of lock at a time -
545 * the iolock, the mmaplock or the ilock, but not more than one at a time. If we
546 * lock more than one at a time, lockdep will report false positives saying we
547 * have violated locking orders.
548 */
549void
550xfs_lock_two_inodes(
551 xfs_inode_t *ip0,
552 xfs_inode_t *ip1,
553 uint lock_mode)
554{
555 xfs_inode_t *temp;
556 int attempts = 0;
557 xfs_log_item_t *lp;
558
559 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) {
560 ASSERT(!(lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)));
561 ASSERT(!(lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
562 } else if (lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL))
563 ASSERT(!(lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
564
565 ASSERT(ip0->i_ino != ip1->i_ino);
566
567 if (ip0->i_ino > ip1->i_ino) {
568 temp = ip0;
569 ip0 = ip1;
570 ip1 = temp;
571 }
572
573 again:
574 xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));
575
576 /*
577 * If the first lock we have locked is in the AIL, we must TRY to get
578 * the second lock. If we can't get it, we must release the first one
579 * and try again.
580 */
581 lp = (xfs_log_item_t *)ip0->i_itemp;
582 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
583 if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
584 xfs_iunlock(ip0, lock_mode);
585 if ((++attempts % 5) == 0)
586 delay(1); /* Don't just spin the CPU */
587 goto again;
588 }
589 } else {
590 xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
591 }
592}
593
594
595void
596__xfs_iflock(
597 struct xfs_inode *ip)
598{
599 wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IFLOCK_BIT);
600 DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IFLOCK_BIT);
601
602 do {
603 prepare_to_wait_exclusive(wq, &wait.wait, TASK_UNINTERRUPTIBLE);
604 if (xfs_isiflocked(ip))
605 io_schedule();
606 } while (!xfs_iflock_nowait(ip));
607
608 finish_wait(wq, &wait.wait);
609}
610
611STATIC uint
612_xfs_dic2xflags(
613 __uint16_t di_flags,
614 uint64_t di_flags2,
615 bool has_attr)
616{
617 uint flags = 0;
618
619 if (di_flags & XFS_DIFLAG_ANY) {
620 if (di_flags & XFS_DIFLAG_REALTIME)
621 flags |= FS_XFLAG_REALTIME;
622 if (di_flags & XFS_DIFLAG_PREALLOC)
623 flags |= FS_XFLAG_PREALLOC;
624 if (di_flags & XFS_DIFLAG_IMMUTABLE)
625 flags |= FS_XFLAG_IMMUTABLE;
626 if (di_flags & XFS_DIFLAG_APPEND)
627 flags |= FS_XFLAG_APPEND;
628 if (di_flags & XFS_DIFLAG_SYNC)
629 flags |= FS_XFLAG_SYNC;
630 if (di_flags & XFS_DIFLAG_NOATIME)
631 flags |= FS_XFLAG_NOATIME;
632 if (di_flags & XFS_DIFLAG_NODUMP)
633 flags |= FS_XFLAG_NODUMP;
634 if (di_flags & XFS_DIFLAG_RTINHERIT)
635 flags |= FS_XFLAG_RTINHERIT;
636 if (di_flags & XFS_DIFLAG_PROJINHERIT)
637 flags |= FS_XFLAG_PROJINHERIT;
638 if (di_flags & XFS_DIFLAG_NOSYMLINKS)
639 flags |= FS_XFLAG_NOSYMLINKS;
640 if (di_flags & XFS_DIFLAG_EXTSIZE)
641 flags |= FS_XFLAG_EXTSIZE;
642 if (di_flags & XFS_DIFLAG_EXTSZINHERIT)
643 flags |= FS_XFLAG_EXTSZINHERIT;
644 if (di_flags & XFS_DIFLAG_NODEFRAG)
645 flags |= FS_XFLAG_NODEFRAG;
646 if (di_flags & XFS_DIFLAG_FILESTREAM)
647 flags |= FS_XFLAG_FILESTREAM;
648 }
649
650 if (di_flags2 & XFS_DIFLAG2_ANY) {
651 if (di_flags2 & XFS_DIFLAG2_DAX)
652 flags |= FS_XFLAG_DAX;
653 }
654
655 if (has_attr)
656 flags |= FS_XFLAG_HASATTR;
657
658 return flags;
659}
660
661uint
662xfs_ip2xflags(
663 struct xfs_inode *ip)
664{
665 struct xfs_icdinode *dic = &ip->i_d;
666
667 return _xfs_dic2xflags(dic->di_flags, dic->di_flags2, XFS_IFORK_Q(ip));
668}
669
670uint
671xfs_dic2xflags(
672 struct xfs_dinode *dip)
673{
674 return _xfs_dic2xflags(be16_to_cpu(dip->di_flags),
675 be64_to_cpu(dip->di_flags2), XFS_DFORK_Q(dip));
676}
677
678/*
679 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
680 * is allowed, otherwise it has to be an exact match. If a CI match is found,
681 * ci_name->name will point to a the actual name (caller must free) or
682 * will be set to NULL if an exact match is found.
683 */
684int
685xfs_lookup(
686 xfs_inode_t *dp,
687 struct xfs_name *name,
688 xfs_inode_t **ipp,
689 struct xfs_name *ci_name)
690{
691 xfs_ino_t inum;
692 int error;
693
694 trace_xfs_lookup(dp, name);
695
696 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
697 return -EIO;
698
699 xfs_ilock(dp, XFS_IOLOCK_SHARED);
700 error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
701 if (error)
702 goto out_unlock;
703
704 error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
705 if (error)
706 goto out_free_name;
707
708 xfs_iunlock(dp, XFS_IOLOCK_SHARED);
709 return 0;
710
711out_free_name:
712 if (ci_name)
713 kmem_free(ci_name->name);
714out_unlock:
715 xfs_iunlock(dp, XFS_IOLOCK_SHARED);
716 *ipp = NULL;
717 return error;
718}
719
720/*
721 * Allocate an inode on disk and return a copy of its in-core version.
722 * The in-core inode is locked exclusively. Set mode, nlink, and rdev
723 * appropriately within the inode. The uid and gid for the inode are
724 * set according to the contents of the given cred structure.
725 *
726 * Use xfs_dialloc() to allocate the on-disk inode. If xfs_dialloc()
727 * has a free inode available, call xfs_iget() to obtain the in-core
728 * version of the allocated inode. Finally, fill in the inode and
729 * log its initial contents. In this case, ialloc_context would be
730 * set to NULL.
731 *
732 * If xfs_dialloc() does not have an available inode, it will replenish
733 * its supply by doing an allocation. Since we can only do one
734 * allocation within a transaction without deadlocks, we must commit
735 * the current transaction before returning the inode itself.
736 * In this case, therefore, we will set ialloc_context and return.
737 * The caller should then commit the current transaction, start a new
738 * transaction, and call xfs_ialloc() again to actually get the inode.
739 *
740 * To ensure that some other process does not grab the inode that
741 * was allocated during the first call to xfs_ialloc(), this routine
742 * also returns the [locked] bp pointing to the head of the freelist
743 * as ialloc_context. The caller should hold this buffer across
744 * the commit and pass it back into this routine on the second call.
745 *
746 * If we are allocating quota inodes, we do not have a parent inode
747 * to attach to or associate with (i.e. pip == NULL) because they
748 * are not linked into the directory structure - they are attached
749 * directly to the superblock - and so have no parent.
750 */
751int
752xfs_ialloc(
753 xfs_trans_t *tp,
754 xfs_inode_t *pip,
755 umode_t mode,
756 xfs_nlink_t nlink,
757 xfs_dev_t rdev,
758 prid_t prid,
759 int okalloc,
760 xfs_buf_t **ialloc_context,
761 xfs_inode_t **ipp)
762{
763 struct xfs_mount *mp = tp->t_mountp;
764 xfs_ino_t ino;
765 xfs_inode_t *ip;
766 uint flags;
767 int error;
768 struct timespec tv;
769 struct inode *inode;
770
771 /*
772 * Call the space management code to pick
773 * the on-disk inode to be allocated.
774 */
775 error = xfs_dialloc(tp, pip ? pip->i_ino : 0, mode, okalloc,
776 ialloc_context, &ino);
777 if (error)
778 return error;
779 if (*ialloc_context || ino == NULLFSINO) {
780 *ipp = NULL;
781 return 0;
782 }
783 ASSERT(*ialloc_context == NULL);
784
785 /*
786 * Get the in-core inode with the lock held exclusively.
787 * This is because we're setting fields here we need
788 * to prevent others from looking at until we're done.
789 */
790 error = xfs_iget(mp, tp, ino, XFS_IGET_CREATE,
791 XFS_ILOCK_EXCL, &ip);
792 if (error)
793 return error;
794 ASSERT(ip != NULL);
795 inode = VFS_I(ip);
796
797 /*
798 * We always convert v1 inodes to v2 now - we only support filesystems
799 * with >= v2 inode capability, so there is no reason for ever leaving
800 * an inode in v1 format.
801 */
802 if (ip->i_d.di_version == 1)
803 ip->i_d.di_version = 2;
804
805 inode->i_mode = mode;
806 set_nlink(inode, nlink);
807 ip->i_d.di_uid = xfs_kuid_to_uid(current_fsuid());
808 ip->i_d.di_gid = xfs_kgid_to_gid(current_fsgid());
809 xfs_set_projid(ip, prid);
810
811 if (pip && XFS_INHERIT_GID(pip)) {
812 ip->i_d.di_gid = pip->i_d.di_gid;
813 if ((VFS_I(pip)->i_mode & S_ISGID) && S_ISDIR(mode))
814 inode->i_mode |= S_ISGID;
815 }
816
817 /*
818 * If the group ID of the new file does not match the effective group
819 * ID or one of the supplementary group IDs, the S_ISGID bit is cleared
820 * (and only if the irix_sgid_inherit compatibility variable is set).
821 */
822 if ((irix_sgid_inherit) &&
823 (inode->i_mode & S_ISGID) &&
824 (!in_group_p(xfs_gid_to_kgid(ip->i_d.di_gid))))
825 inode->i_mode &= ~S_ISGID;
826
827 ip->i_d.di_size = 0;
828 ip->i_d.di_nextents = 0;
829 ASSERT(ip->i_d.di_nblocks == 0);
830
831 tv = current_fs_time(mp->m_super);
832 inode->i_mtime = tv;
833 inode->i_atime = tv;
834 inode->i_ctime = tv;
835
836 ip->i_d.di_extsize = 0;
837 ip->i_d.di_dmevmask = 0;
838 ip->i_d.di_dmstate = 0;
839 ip->i_d.di_flags = 0;
840
841 if (ip->i_d.di_version == 3) {
842 inode->i_version = 1;
843 ip->i_d.di_flags2 = 0;
844 ip->i_d.di_crtime.t_sec = (__int32_t)tv.tv_sec;
845 ip->i_d.di_crtime.t_nsec = (__int32_t)tv.tv_nsec;
846 }
847
848
849 flags = XFS_ILOG_CORE;
850 switch (mode & S_IFMT) {
851 case S_IFIFO:
852 case S_IFCHR:
853 case S_IFBLK:
854 case S_IFSOCK:
855 ip->i_d.di_format = XFS_DINODE_FMT_DEV;
856 ip->i_df.if_u2.if_rdev = rdev;
857 ip->i_df.if_flags = 0;
858 flags |= XFS_ILOG_DEV;
859 break;
860 case S_IFREG:
861 case S_IFDIR:
862 if (pip && (pip->i_d.di_flags & XFS_DIFLAG_ANY)) {
863 uint64_t di_flags2 = 0;
864 uint di_flags = 0;
865
866 if (S_ISDIR(mode)) {
867 if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
868 di_flags |= XFS_DIFLAG_RTINHERIT;
869 if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
870 di_flags |= XFS_DIFLAG_EXTSZINHERIT;
871 ip->i_d.di_extsize = pip->i_d.di_extsize;
872 }
873 if (pip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
874 di_flags |= XFS_DIFLAG_PROJINHERIT;
875 } else if (S_ISREG(mode)) {
876 if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
877 di_flags |= XFS_DIFLAG_REALTIME;
878 if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
879 di_flags |= XFS_DIFLAG_EXTSIZE;
880 ip->i_d.di_extsize = pip->i_d.di_extsize;
881 }
882 }
883 if ((pip->i_d.di_flags & XFS_DIFLAG_NOATIME) &&
884 xfs_inherit_noatime)
885 di_flags |= XFS_DIFLAG_NOATIME;
886 if ((pip->i_d.di_flags & XFS_DIFLAG_NODUMP) &&
887 xfs_inherit_nodump)
888 di_flags |= XFS_DIFLAG_NODUMP;
889 if ((pip->i_d.di_flags & XFS_DIFLAG_SYNC) &&
890 xfs_inherit_sync)
891 di_flags |= XFS_DIFLAG_SYNC;
892 if ((pip->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) &&
893 xfs_inherit_nosymlinks)
894 di_flags |= XFS_DIFLAG_NOSYMLINKS;
895 if ((pip->i_d.di_flags & XFS_DIFLAG_NODEFRAG) &&
896 xfs_inherit_nodefrag)
897 di_flags |= XFS_DIFLAG_NODEFRAG;
898 if (pip->i_d.di_flags & XFS_DIFLAG_FILESTREAM)
899 di_flags |= XFS_DIFLAG_FILESTREAM;
900 if (pip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
901 di_flags2 |= XFS_DIFLAG2_DAX;
902
903 ip->i_d.di_flags |= di_flags;
904 ip->i_d.di_flags2 |= di_flags2;
905 }
906 /* FALLTHROUGH */
907 case S_IFLNK:
908 ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS;
909 ip->i_df.if_flags = XFS_IFEXTENTS;
910 ip->i_df.if_bytes = ip->i_df.if_real_bytes = 0;
911 ip->i_df.if_u1.if_extents = NULL;
912 break;
913 default:
914 ASSERT(0);
915 }
916 /*
917 * Attribute fork settings for new inode.
918 */
919 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
920 ip->i_d.di_anextents = 0;
921
922 /*
923 * Log the new values stuffed into the inode.
924 */
925 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
926 xfs_trans_log_inode(tp, ip, flags);
927
928 /* now that we have an i_mode we can setup the inode structure */
929 xfs_setup_inode(ip);
930
931 *ipp = ip;
932 return 0;
933}
934
935/*
936 * Allocates a new inode from disk and return a pointer to the
937 * incore copy. This routine will internally commit the current
938 * transaction and allocate a new one if the Space Manager needed
939 * to do an allocation to replenish the inode free-list.
940 *
941 * This routine is designed to be called from xfs_create and
942 * xfs_create_dir.
943 *
944 */
945int
946xfs_dir_ialloc(
947 xfs_trans_t **tpp, /* input: current transaction;
948 output: may be a new transaction. */
949 xfs_inode_t *dp, /* directory within whose allocate
950 the inode. */
951 umode_t mode,
952 xfs_nlink_t nlink,
953 xfs_dev_t rdev,
954 prid_t prid, /* project id */
955 int okalloc, /* ok to allocate new space */
956 xfs_inode_t **ipp, /* pointer to inode; it will be
957 locked. */
958 int *committed)
959
960{
961 xfs_trans_t *tp;
962 xfs_inode_t *ip;
963 xfs_buf_t *ialloc_context = NULL;
964 int code;
965 void *dqinfo;
966 uint tflags;
967
968 tp = *tpp;
969 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
970
971 /*
972 * xfs_ialloc will return a pointer to an incore inode if
973 * the Space Manager has an available inode on the free
974 * list. Otherwise, it will do an allocation and replenish
975 * the freelist. Since we can only do one allocation per
976 * transaction without deadlocks, we will need to commit the
977 * current transaction and start a new one. We will then
978 * need to call xfs_ialloc again to get the inode.
979 *
980 * If xfs_ialloc did an allocation to replenish the freelist,
981 * it returns the bp containing the head of the freelist as
982 * ialloc_context. We will hold a lock on it across the
983 * transaction commit so that no other process can steal
984 * the inode(s) that we've just allocated.
985 */
986 code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid, okalloc,
987 &ialloc_context, &ip);
988
989 /*
990 * Return an error if we were unable to allocate a new inode.
991 * This should only happen if we run out of space on disk or
992 * encounter a disk error.
993 */
994 if (code) {
995 *ipp = NULL;
996 return code;
997 }
998 if (!ialloc_context && !ip) {
999 *ipp = NULL;
1000 return -ENOSPC;
1001 }
1002
1003 /*
1004 * If the AGI buffer is non-NULL, then we were unable to get an
1005 * inode in one operation. We need to commit the current
1006 * transaction and call xfs_ialloc() again. It is guaranteed
1007 * to succeed the second time.
1008 */
1009 if (ialloc_context) {
1010 /*
1011 * Normally, xfs_trans_commit releases all the locks.
1012 * We call bhold to hang on to the ialloc_context across
1013 * the commit. Holding this buffer prevents any other
1014 * processes from doing any allocations in this
1015 * allocation group.
1016 */
1017 xfs_trans_bhold(tp, ialloc_context);
1018
1019 /*
1020 * We want the quota changes to be associated with the next
1021 * transaction, NOT this one. So, detach the dqinfo from this
1022 * and attach it to the next transaction.
1023 */
1024 dqinfo = NULL;
1025 tflags = 0;
1026 if (tp->t_dqinfo) {
1027 dqinfo = (void *)tp->t_dqinfo;
1028 tp->t_dqinfo = NULL;
1029 tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY;
1030 tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY);
1031 }
1032
1033 code = xfs_trans_roll(&tp, 0);
1034 if (committed != NULL)
1035 *committed = 1;
1036
1037 /*
1038 * Re-attach the quota info that we detached from prev trx.
1039 */
1040 if (dqinfo) {
1041 tp->t_dqinfo = dqinfo;
1042 tp->t_flags |= tflags;
1043 }
1044
1045 if (code) {
1046 xfs_buf_relse(ialloc_context);
1047 *tpp = tp;
1048 *ipp = NULL;
1049 return code;
1050 }
1051 xfs_trans_bjoin(tp, ialloc_context);
1052
1053 /*
1054 * Call ialloc again. Since we've locked out all
1055 * other allocations in this allocation group,
1056 * this call should always succeed.
1057 */
1058 code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid,
1059 okalloc, &ialloc_context, &ip);
1060
1061 /*
1062 * If we get an error at this point, return to the caller
1063 * so that the current transaction can be aborted.
1064 */
1065 if (code) {
1066 *tpp = tp;
1067 *ipp = NULL;
1068 return code;
1069 }
1070 ASSERT(!ialloc_context && ip);
1071
1072 } else {
1073 if (committed != NULL)
1074 *committed = 0;
1075 }
1076
1077 *ipp = ip;
1078 *tpp = tp;
1079
1080 return 0;
1081}
1082
1083/*
1084 * Decrement the link count on an inode & log the change. If this causes the
1085 * link count to go to zero, move the inode to AGI unlinked list so that it can
1086 * be freed when the last active reference goes away via xfs_inactive().
1087 */
1088int /* error */
1089xfs_droplink(
1090 xfs_trans_t *tp,
1091 xfs_inode_t *ip)
1092{
1093 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
1094
1095 drop_nlink(VFS_I(ip));
1096 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1097
1098 if (VFS_I(ip)->i_nlink)
1099 return 0;
1100
1101 return xfs_iunlink(tp, ip);
1102}
1103
1104/*
1105 * Increment the link count on an inode & log the change.
1106 */
1107int
1108xfs_bumplink(
1109 xfs_trans_t *tp,
1110 xfs_inode_t *ip)
1111{
1112 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
1113
1114 ASSERT(ip->i_d.di_version > 1);
1115 inc_nlink(VFS_I(ip));
1116 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1117 return 0;
1118}
1119
1120int
1121xfs_create(
1122 xfs_inode_t *dp,
1123 struct xfs_name *name,
1124 umode_t mode,
1125 xfs_dev_t rdev,
1126 xfs_inode_t **ipp)
1127{
1128 int is_dir = S_ISDIR(mode);
1129 struct xfs_mount *mp = dp->i_mount;
1130 struct xfs_inode *ip = NULL;
1131 struct xfs_trans *tp = NULL;
1132 int error;
1133 xfs_bmap_free_t free_list;
1134 xfs_fsblock_t first_block;
1135 bool unlock_dp_on_error = false;
1136 prid_t prid;
1137 struct xfs_dquot *udqp = NULL;
1138 struct xfs_dquot *gdqp = NULL;
1139 struct xfs_dquot *pdqp = NULL;
1140 struct xfs_trans_res *tres;
1141 uint resblks;
1142
1143 trace_xfs_create(dp, name);
1144
1145 if (XFS_FORCED_SHUTDOWN(mp))
1146 return -EIO;
1147
1148 prid = xfs_get_initial_prid(dp);
1149
1150 /*
1151 * Make sure that we have allocated dquot(s) on disk.
1152 */
1153 error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()),
1154 xfs_kgid_to_gid(current_fsgid()), prid,
1155 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
1156 &udqp, &gdqp, &pdqp);
1157 if (error)
1158 return error;
1159
1160 if (is_dir) {
1161 rdev = 0;
1162 resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
1163 tres = &M_RES(mp)->tr_mkdir;
1164 tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
1165 } else {
1166 resblks = XFS_CREATE_SPACE_RES(mp, name->len);
1167 tres = &M_RES(mp)->tr_create;
1168 tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
1169 }
1170
1171 /*
1172 * Initially assume that the file does not exist and
1173 * reserve the resources for that case. If that is not
1174 * the case we'll drop the one we have and get a more
1175 * appropriate transaction later.
1176 */
1177 error = xfs_trans_reserve(tp, tres, resblks, 0);
1178 if (error == -ENOSPC) {
1179 /* flush outstanding delalloc blocks and retry */
1180 xfs_flush_inodes(mp);
1181 error = xfs_trans_reserve(tp, tres, resblks, 0);
1182 }
1183 if (error == -ENOSPC) {
1184 /* No space at all so try a "no-allocation" reservation */
1185 resblks = 0;
1186 error = xfs_trans_reserve(tp, tres, 0, 0);
1187 }
1188 if (error)
1189 goto out_trans_cancel;
1190
1191
1192 xfs_ilock(dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL |
1193 XFS_IOLOCK_PARENT | XFS_ILOCK_PARENT);
1194 unlock_dp_on_error = true;
1195
1196 xfs_bmap_init(&free_list, &first_block);
1197
1198 /*
1199 * Reserve disk quota and the inode.
1200 */
1201 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
1202 pdqp, resblks, 1, 0);
1203 if (error)
1204 goto out_trans_cancel;
1205
1206 if (!resblks) {
1207 error = xfs_dir_canenter(tp, dp, name);
1208 if (error)
1209 goto out_trans_cancel;
1210 }
1211
1212 /*
1213 * A newly created regular or special file just has one directory
1214 * entry pointing to them, but a directory also the "." entry
1215 * pointing to itself.
1216 */
1217 error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev,
1218 prid, resblks > 0, &ip, NULL);
1219 if (error)
1220 goto out_trans_cancel;
1221
1222 /*
1223 * Now we join the directory inode to the transaction. We do not do it
1224 * earlier because xfs_dir_ialloc might commit the previous transaction
1225 * (and release all the locks). An error from here on will result in
1226 * the transaction cancel unlocking dp so don't do it explicitly in the
1227 * error path.
1228 */
1229 xfs_trans_ijoin(tp, dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1230 unlock_dp_on_error = false;
1231
1232 error = xfs_dir_createname(tp, dp, name, ip->i_ino,
1233 &first_block, &free_list, resblks ?
1234 resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
1235 if (error) {
1236 ASSERT(error != -ENOSPC);
1237 goto out_trans_cancel;
1238 }
1239 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1240 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1241
1242 if (is_dir) {
1243 error = xfs_dir_init(tp, ip, dp);
1244 if (error)
1245 goto out_bmap_cancel;
1246
1247 error = xfs_bumplink(tp, dp);
1248 if (error)
1249 goto out_bmap_cancel;
1250 }
1251
1252 /*
1253 * If this is a synchronous mount, make sure that the
1254 * create transaction goes to disk before returning to
1255 * the user.
1256 */
1257 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
1258 xfs_trans_set_sync(tp);
1259
1260 /*
1261 * Attach the dquot(s) to the inodes and modify them incore.
1262 * These ids of the inode couldn't have changed since the new
1263 * inode has been locked ever since it was created.
1264 */
1265 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
1266
1267 error = xfs_bmap_finish(&tp, &free_list, NULL);
1268 if (error)
1269 goto out_bmap_cancel;
1270
1271 error = xfs_trans_commit(tp);
1272 if (error)
1273 goto out_release_inode;
1274
1275 xfs_qm_dqrele(udqp);
1276 xfs_qm_dqrele(gdqp);
1277 xfs_qm_dqrele(pdqp);
1278
1279 *ipp = ip;
1280 return 0;
1281
1282 out_bmap_cancel:
1283 xfs_bmap_cancel(&free_list);
1284 out_trans_cancel:
1285 xfs_trans_cancel(tp);
1286 out_release_inode:
1287 /*
1288 * Wait until after the current transaction is aborted to finish the
1289 * setup of the inode and release the inode. This prevents recursive
1290 * transactions and deadlocks from xfs_inactive.
1291 */
1292 if (ip) {
1293 xfs_finish_inode_setup(ip);
1294 IRELE(ip);
1295 }
1296
1297 xfs_qm_dqrele(udqp);
1298 xfs_qm_dqrele(gdqp);
1299 xfs_qm_dqrele(pdqp);
1300
1301 if (unlock_dp_on_error)
1302 xfs_iunlock(dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1303 return error;
1304}
1305
1306int
1307xfs_create_tmpfile(
1308 struct xfs_inode *dp,
1309 struct dentry *dentry,
1310 umode_t mode,
1311 struct xfs_inode **ipp)
1312{
1313 struct xfs_mount *mp = dp->i_mount;
1314 struct xfs_inode *ip = NULL;
1315 struct xfs_trans *tp = NULL;
1316 int error;
1317 prid_t prid;
1318 struct xfs_dquot *udqp = NULL;
1319 struct xfs_dquot *gdqp = NULL;
1320 struct xfs_dquot *pdqp = NULL;
1321 struct xfs_trans_res *tres;
1322 uint resblks;
1323
1324 if (XFS_FORCED_SHUTDOWN(mp))
1325 return -EIO;
1326
1327 prid = xfs_get_initial_prid(dp);
1328
1329 /*
1330 * Make sure that we have allocated dquot(s) on disk.
1331 */
1332 error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()),
1333 xfs_kgid_to_gid(current_fsgid()), prid,
1334 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
1335 &udqp, &gdqp, &pdqp);
1336 if (error)
1337 return error;
1338
1339 resblks = XFS_IALLOC_SPACE_RES(mp);
1340 tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE_TMPFILE);
1341
1342 tres = &M_RES(mp)->tr_create_tmpfile;
1343 error = xfs_trans_reserve(tp, tres, resblks, 0);
1344 if (error == -ENOSPC) {
1345 /* No space at all so try a "no-allocation" reservation */
1346 resblks = 0;
1347 error = xfs_trans_reserve(tp, tres, 0, 0);
1348 }
1349 if (error)
1350 goto out_trans_cancel;
1351
1352 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
1353 pdqp, resblks, 1, 0);
1354 if (error)
1355 goto out_trans_cancel;
1356
1357 error = xfs_dir_ialloc(&tp, dp, mode, 1, 0,
1358 prid, resblks > 0, &ip, NULL);
1359 if (error)
1360 goto out_trans_cancel;
1361
1362 if (mp->m_flags & XFS_MOUNT_WSYNC)
1363 xfs_trans_set_sync(tp);
1364
1365 /*
1366 * Attach the dquot(s) to the inodes and modify them incore.
1367 * These ids of the inode couldn't have changed since the new
1368 * inode has been locked ever since it was created.
1369 */
1370 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
1371
1372 error = xfs_iunlink(tp, ip);
1373 if (error)
1374 goto out_trans_cancel;
1375
1376 error = xfs_trans_commit(tp);
1377 if (error)
1378 goto out_release_inode;
1379
1380 xfs_qm_dqrele(udqp);
1381 xfs_qm_dqrele(gdqp);
1382 xfs_qm_dqrele(pdqp);
1383
1384 *ipp = ip;
1385 return 0;
1386
1387 out_trans_cancel:
1388 xfs_trans_cancel(tp);
1389 out_release_inode:
1390 /*
1391 * Wait until after the current transaction is aborted to finish the
1392 * setup of the inode and release the inode. This prevents recursive
1393 * transactions and deadlocks from xfs_inactive.
1394 */
1395 if (ip) {
1396 xfs_finish_inode_setup(ip);
1397 IRELE(ip);
1398 }
1399
1400 xfs_qm_dqrele(udqp);
1401 xfs_qm_dqrele(gdqp);
1402 xfs_qm_dqrele(pdqp);
1403
1404 return error;
1405}
1406
1407int
1408xfs_link(
1409 xfs_inode_t *tdp,
1410 xfs_inode_t *sip,
1411 struct xfs_name *target_name)
1412{
1413 xfs_mount_t *mp = tdp->i_mount;
1414 xfs_trans_t *tp;
1415 int error;
1416 xfs_bmap_free_t free_list;
1417 xfs_fsblock_t first_block;
1418 int resblks;
1419
1420 trace_xfs_link(tdp, target_name);
1421
1422 ASSERT(!S_ISDIR(VFS_I(sip)->i_mode));
1423
1424 if (XFS_FORCED_SHUTDOWN(mp))
1425 return -EIO;
1426
1427 error = xfs_qm_dqattach(sip, 0);
1428 if (error)
1429 goto std_return;
1430
1431 error = xfs_qm_dqattach(tdp, 0);
1432 if (error)
1433 goto std_return;
1434
1435 tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
1436 resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
1437 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_link, resblks, 0);
1438 if (error == -ENOSPC) {
1439 resblks = 0;
1440 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_link, 0, 0);
1441 }
1442 if (error)
1443 goto error_return;
1444
1445 xfs_ilock(tdp, XFS_IOLOCK_EXCL | XFS_IOLOCK_PARENT);
1446 xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL);
1447
1448 xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
1449 xfs_trans_ijoin(tp, tdp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1450
1451 /*
1452 * If we are using project inheritance, we only allow hard link
1453 * creation in our tree when the project IDs are the same; else
1454 * the tree quota mechanism could be circumvented.
1455 */
1456 if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1457 (xfs_get_projid(tdp) != xfs_get_projid(sip)))) {
1458 error = -EXDEV;
1459 goto error_return;
1460 }
1461
1462 if (!resblks) {
1463 error = xfs_dir_canenter(tp, tdp, target_name);
1464 if (error)
1465 goto error_return;
1466 }
1467
1468 xfs_bmap_init(&free_list, &first_block);
1469
1470 /*
1471 * Handle initial link state of O_TMPFILE inode
1472 */
1473 if (VFS_I(sip)->i_nlink == 0) {
1474 error = xfs_iunlink_remove(tp, sip);
1475 if (error)
1476 goto error_return;
1477 }
1478
1479 error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
1480 &first_block, &free_list, resblks);
1481 if (error)
1482 goto error_return;
1483 xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1484 xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
1485
1486 error = xfs_bumplink(tp, sip);
1487 if (error)
1488 goto error_return;
1489
1490 /*
1491 * If this is a synchronous mount, make sure that the
1492 * link transaction goes to disk before returning to
1493 * the user.
1494 */
1495 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
1496 xfs_trans_set_sync(tp);
1497
1498 error = xfs_bmap_finish(&tp, &free_list, NULL);
1499 if (error) {
1500 xfs_bmap_cancel(&free_list);
1501 goto error_return;
1502 }
1503
1504 return xfs_trans_commit(tp);
1505
1506 error_return:
1507 xfs_trans_cancel(tp);
1508 std_return:
1509 return error;
1510}
1511
1512/*
1513 * Free up the underlying blocks past new_size. The new size must be smaller
1514 * than the current size. This routine can be used both for the attribute and
1515 * data fork, and does not modify the inode size, which is left to the caller.
1516 *
1517 * The transaction passed to this routine must have made a permanent log
1518 * reservation of at least XFS_ITRUNCATE_LOG_RES. This routine may commit the
1519 * given transaction and start new ones, so make sure everything involved in
1520 * the transaction is tidy before calling here. Some transaction will be
1521 * returned to the caller to be committed. The incoming transaction must
1522 * already include the inode, and both inode locks must be held exclusively.
1523 * The inode must also be "held" within the transaction. On return the inode
1524 * will be "held" within the returned transaction. This routine does NOT
1525 * require any disk space to be reserved for it within the transaction.
1526 *
1527 * If we get an error, we must return with the inode locked and linked into the
1528 * current transaction. This keeps things simple for the higher level code,
1529 * because it always knows that the inode is locked and held in the transaction
1530 * that returns to it whether errors occur or not. We don't mark the inode
1531 * dirty on error so that transactions can be easily aborted if possible.
1532 */
1533int
1534xfs_itruncate_extents(
1535 struct xfs_trans **tpp,
1536 struct xfs_inode *ip,
1537 int whichfork,
1538 xfs_fsize_t new_size)
1539{
1540 struct xfs_mount *mp = ip->i_mount;
1541 struct xfs_trans *tp = *tpp;
1542 xfs_bmap_free_t free_list;
1543 xfs_fsblock_t first_block;
1544 xfs_fileoff_t first_unmap_block;
1545 xfs_fileoff_t last_block;
1546 xfs_filblks_t unmap_len;
1547 int error = 0;
1548 int done = 0;
1549
1550 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1551 ASSERT(!atomic_read(&VFS_I(ip)->i_count) ||
1552 xfs_isilocked(ip, XFS_IOLOCK_EXCL));
1553 ASSERT(new_size <= XFS_ISIZE(ip));
1554 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
1555 ASSERT(ip->i_itemp != NULL);
1556 ASSERT(ip->i_itemp->ili_lock_flags == 0);
1557 ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
1558
1559 trace_xfs_itruncate_extents_start(ip, new_size);
1560
1561 /*
1562 * Since it is possible for space to become allocated beyond
1563 * the end of the file (in a crash where the space is allocated
1564 * but the inode size is not yet updated), simply remove any
1565 * blocks which show up between the new EOF and the maximum
1566 * possible file size. If the first block to be removed is
1567 * beyond the maximum file size (ie it is the same as last_block),
1568 * then there is nothing to do.
1569 */
1570 first_unmap_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size);
1571 last_block = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
1572 if (first_unmap_block == last_block)
1573 return 0;
1574
1575 ASSERT(first_unmap_block < last_block);
1576 unmap_len = last_block - first_unmap_block + 1;
1577 while (!done) {
1578 xfs_bmap_init(&free_list, &first_block);
1579 error = xfs_bunmapi(tp, ip,
1580 first_unmap_block, unmap_len,
1581 xfs_bmapi_aflag(whichfork),
1582 XFS_ITRUNC_MAX_EXTENTS,
1583 &first_block, &free_list,
1584 &done);
1585 if (error)
1586 goto out_bmap_cancel;
1587
1588 /*
1589 * Duplicate the transaction that has the permanent
1590 * reservation and commit the old transaction.
1591 */
1592 error = xfs_bmap_finish(&tp, &free_list, ip);
1593 if (error)
1594 goto out_bmap_cancel;
1595
1596 error = xfs_trans_roll(&tp, ip);
1597 if (error)
1598 goto out;
1599 }
1600
1601 /*
1602 * Always re-log the inode so that our permanent transaction can keep
1603 * on rolling it forward in the log.
1604 */
1605 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1606
1607 trace_xfs_itruncate_extents_end(ip, new_size);
1608
1609out:
1610 *tpp = tp;
1611 return error;
1612out_bmap_cancel:
1613 /*
1614 * If the bunmapi call encounters an error, return to the caller where
1615 * the transaction can be properly aborted. We just need to make sure
1616 * we're not holding any resources that we were not when we came in.
1617 */
1618 xfs_bmap_cancel(&free_list);
1619 goto out;
1620}
1621
1622int
1623xfs_release(
1624 xfs_inode_t *ip)
1625{
1626 xfs_mount_t *mp = ip->i_mount;
1627 int error;
1628
1629 if (!S_ISREG(VFS_I(ip)->i_mode) || (VFS_I(ip)->i_mode == 0))
1630 return 0;
1631
1632 /* If this is a read-only mount, don't do this (would generate I/O) */
1633 if (mp->m_flags & XFS_MOUNT_RDONLY)
1634 return 0;
1635
1636 if (!XFS_FORCED_SHUTDOWN(mp)) {
1637 int truncated;
1638
1639 /*
1640 * If we previously truncated this file and removed old data
1641 * in the process, we want to initiate "early" writeout on
1642 * the last close. This is an attempt to combat the notorious
1643 * NULL files problem which is particularly noticeable from a
1644 * truncate down, buffered (re-)write (delalloc), followed by
1645 * a crash. What we are effectively doing here is
1646 * significantly reducing the time window where we'd otherwise
1647 * be exposed to that problem.
1648 */
1649 truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
1650 if (truncated) {
1651 xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
1652 if (ip->i_delayed_blks > 0) {
1653 error = filemap_flush(VFS_I(ip)->i_mapping);
1654 if (error)
1655 return error;
1656 }
1657 }
1658 }
1659
1660 if (VFS_I(ip)->i_nlink == 0)
1661 return 0;
1662
1663 if (xfs_can_free_eofblocks(ip, false)) {
1664
1665 /*
1666 * If we can't get the iolock just skip truncating the blocks
1667 * past EOF because we could deadlock with the mmap_sem
1668 * otherwise. We'll get another chance to drop them once the
1669 * last reference to the inode is dropped, so we'll never leak
1670 * blocks permanently.
1671 *
1672 * Further, check if the inode is being opened, written and
1673 * closed frequently and we have delayed allocation blocks
1674 * outstanding (e.g. streaming writes from the NFS server),
1675 * truncating the blocks past EOF will cause fragmentation to
1676 * occur.
1677 *
1678 * In this case don't do the truncation, either, but we have to
1679 * be careful how we detect this case. Blocks beyond EOF show
1680 * up as i_delayed_blks even when the inode is clean, so we
1681 * need to truncate them away first before checking for a dirty
1682 * release. Hence on the first dirty close we will still remove
1683 * the speculative allocation, but after that we will leave it
1684 * in place.
1685 */
1686 if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE))
1687 return 0;
1688
1689 error = xfs_free_eofblocks(mp, ip, true);
1690 if (error && error != -EAGAIN)
1691 return error;
1692
1693 /* delalloc blocks after truncation means it really is dirty */
1694 if (ip->i_delayed_blks)
1695 xfs_iflags_set(ip, XFS_IDIRTY_RELEASE);
1696 }
1697 return 0;
1698}
1699
1700/*
1701 * xfs_inactive_truncate
1702 *
1703 * Called to perform a truncate when an inode becomes unlinked.
1704 */
1705STATIC int
1706xfs_inactive_truncate(
1707 struct xfs_inode *ip)
1708{
1709 struct xfs_mount *mp = ip->i_mount;
1710 struct xfs_trans *tp;
1711 int error;
1712
1713 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
1714 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
1715 if (error) {
1716 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1717 xfs_trans_cancel(tp);
1718 return error;
1719 }
1720
1721 xfs_ilock(ip, XFS_ILOCK_EXCL);
1722 xfs_trans_ijoin(tp, ip, 0);
1723
1724 /*
1725 * Log the inode size first to prevent stale data exposure in the event
1726 * of a system crash before the truncate completes. See the related
1727 * comment in xfs_setattr_size() for details.
1728 */
1729 ip->i_d.di_size = 0;
1730 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1731
1732 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
1733 if (error)
1734 goto error_trans_cancel;
1735
1736 ASSERT(ip->i_d.di_nextents == 0);
1737
1738 error = xfs_trans_commit(tp);
1739 if (error)
1740 goto error_unlock;
1741
1742 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1743 return 0;
1744
1745error_trans_cancel:
1746 xfs_trans_cancel(tp);
1747error_unlock:
1748 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1749 return error;
1750}
1751
1752/*
1753 * xfs_inactive_ifree()
1754 *
1755 * Perform the inode free when an inode is unlinked.
1756 */
1757STATIC int
1758xfs_inactive_ifree(
1759 struct xfs_inode *ip)
1760{
1761 xfs_bmap_free_t free_list;
1762 xfs_fsblock_t first_block;
1763 struct xfs_mount *mp = ip->i_mount;
1764 struct xfs_trans *tp;
1765 int error;
1766
1767 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
1768
1769 /*
1770 * The ifree transaction might need to allocate blocks for record
1771 * insertion to the finobt. We don't want to fail here at ENOSPC, so
1772 * allow ifree to dip into the reserved block pool if necessary.
1773 *
1774 * Freeing large sets of inodes generally means freeing inode chunks,
1775 * directory and file data blocks, so this should be relatively safe.
1776 * Only under severe circumstances should it be possible to free enough
1777 * inodes to exhaust the reserve block pool via finobt expansion while
1778 * at the same time not creating free space in the filesystem.
1779 *
1780 * Send a warning if the reservation does happen to fail, as the inode
1781 * now remains allocated and sits on the unlinked list until the fs is
1782 * repaired.
1783 */
1784 tp->t_flags |= XFS_TRANS_RESERVE;
1785 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ifree,
1786 XFS_IFREE_SPACE_RES(mp), 0);
1787 if (error) {
1788 if (error == -ENOSPC) {
1789 xfs_warn_ratelimited(mp,
1790 "Failed to remove inode(s) from unlinked list. "
1791 "Please free space, unmount and run xfs_repair.");
1792 } else {
1793 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1794 }
1795 xfs_trans_cancel(tp);
1796 return error;
1797 }
1798
1799 xfs_ilock(ip, XFS_ILOCK_EXCL);
1800 xfs_trans_ijoin(tp, ip, 0);
1801
1802 xfs_bmap_init(&free_list, &first_block);
1803 error = xfs_ifree(tp, ip, &free_list);
1804 if (error) {
1805 /*
1806 * If we fail to free the inode, shut down. The cancel
1807 * might do that, we need to make sure. Otherwise the
1808 * inode might be lost for a long time or forever.
1809 */
1810 if (!XFS_FORCED_SHUTDOWN(mp)) {
1811 xfs_notice(mp, "%s: xfs_ifree returned error %d",
1812 __func__, error);
1813 xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
1814 }
1815 xfs_trans_cancel(tp);
1816 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1817 return error;
1818 }
1819
1820 /*
1821 * Credit the quota account(s). The inode is gone.
1822 */
1823 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
1824
1825 /*
1826 * Just ignore errors at this point. There is nothing we can do except
1827 * to try to keep going. Make sure it's not a silent error.
1828 */
1829 error = xfs_bmap_finish(&tp, &free_list, NULL);
1830 if (error) {
1831 xfs_notice(mp, "%s: xfs_bmap_finish returned error %d",
1832 __func__, error);
1833 xfs_bmap_cancel(&free_list);
1834 }
1835 error = xfs_trans_commit(tp);
1836 if (error)
1837 xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
1838 __func__, error);
1839
1840 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1841 return 0;
1842}
1843
1844/*
1845 * xfs_inactive
1846 *
1847 * This is called when the vnode reference count for the vnode
1848 * goes to zero. If the file has been unlinked, then it must
1849 * now be truncated. Also, we clear all of the read-ahead state
1850 * kept for the inode here since the file is now closed.
1851 */
1852void
1853xfs_inactive(
1854 xfs_inode_t *ip)
1855{
1856 struct xfs_mount *mp;
1857 int error;
1858 int truncate = 0;
1859
1860 /*
1861 * If the inode is already free, then there can be nothing
1862 * to clean up here.
1863 */
1864 if (VFS_I(ip)->i_mode == 0) {
1865 ASSERT(ip->i_df.if_real_bytes == 0);
1866 ASSERT(ip->i_df.if_broot_bytes == 0);
1867 return;
1868 }
1869
1870 mp = ip->i_mount;
1871
1872 /* If this is a read-only mount, don't do this (would generate I/O) */
1873 if (mp->m_flags & XFS_MOUNT_RDONLY)
1874 return;
1875
1876 if (VFS_I(ip)->i_nlink != 0) {
1877 /*
1878 * force is true because we are evicting an inode from the
1879 * cache. Post-eof blocks must be freed, lest we end up with
1880 * broken free space accounting.
1881 */
1882 if (xfs_can_free_eofblocks(ip, true))
1883 xfs_free_eofblocks(mp, ip, false);
1884
1885 return;
1886 }
1887
1888 if (S_ISREG(VFS_I(ip)->i_mode) &&
1889 (ip->i_d.di_size != 0 || XFS_ISIZE(ip) != 0 ||
1890 ip->i_d.di_nextents > 0 || ip->i_delayed_blks > 0))
1891 truncate = 1;
1892
1893 error = xfs_qm_dqattach(ip, 0);
1894 if (error)
1895 return;
1896
1897 if (S_ISLNK(VFS_I(ip)->i_mode))
1898 error = xfs_inactive_symlink(ip);
1899 else if (truncate)
1900 error = xfs_inactive_truncate(ip);
1901 if (error)
1902 return;
1903
1904 /*
1905 * If there are attributes associated with the file then blow them away
1906 * now. The code calls a routine that recursively deconstructs the
1907 * attribute fork. If also blows away the in-core attribute fork.
1908 */
1909 if (XFS_IFORK_Q(ip)) {
1910 error = xfs_attr_inactive(ip);
1911 if (error)
1912 return;
1913 }
1914
1915 ASSERT(!ip->i_afp);
1916 ASSERT(ip->i_d.di_anextents == 0);
1917 ASSERT(ip->i_d.di_forkoff == 0);
1918
1919 /*
1920 * Free the inode.
1921 */
1922 error = xfs_inactive_ifree(ip);
1923 if (error)
1924 return;
1925
1926 /*
1927 * Release the dquots held by inode, if any.
1928 */
1929 xfs_qm_dqdetach(ip);
1930}
1931
1932/*
1933 * This is called when the inode's link count goes to 0 or we are creating a
1934 * tmpfile via O_TMPFILE. In the case of a tmpfile, @ignore_linkcount will be
1935 * set to true as the link count is dropped to zero by the VFS after we've
1936 * created the file successfully, so we have to add it to the unlinked list
1937 * while the link count is non-zero.
1938 *
1939 * We place the on-disk inode on a list in the AGI. It will be pulled from this
1940 * list when the inode is freed.
1941 */
1942STATIC int
1943xfs_iunlink(
1944 struct xfs_trans *tp,
1945 struct xfs_inode *ip)
1946{
1947 xfs_mount_t *mp = tp->t_mountp;
1948 xfs_agi_t *agi;
1949 xfs_dinode_t *dip;
1950 xfs_buf_t *agibp;
1951 xfs_buf_t *ibp;
1952 xfs_agino_t agino;
1953 short bucket_index;
1954 int offset;
1955 int error;
1956
1957 ASSERT(VFS_I(ip)->i_mode != 0);
1958
1959 /*
1960 * Get the agi buffer first. It ensures lock ordering
1961 * on the list.
1962 */
1963 error = xfs_read_agi(mp, tp, XFS_INO_TO_AGNO(mp, ip->i_ino), &agibp);
1964 if (error)
1965 return error;
1966 agi = XFS_BUF_TO_AGI(agibp);
1967
1968 /*
1969 * Get the index into the agi hash table for the
1970 * list this inode will go on.
1971 */
1972 agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
1973 ASSERT(agino != 0);
1974 bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
1975 ASSERT(agi->agi_unlinked[bucket_index]);
1976 ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != agino);
1977
1978 if (agi->agi_unlinked[bucket_index] != cpu_to_be32(NULLAGINO)) {
1979 /*
1980 * There is already another inode in the bucket we need
1981 * to add ourselves to. Add us at the front of the list.
1982 * Here we put the head pointer into our next pointer,
1983 * and then we fall through to point the head at us.
1984 */
1985 error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
1986 0, 0);
1987 if (error)
1988 return error;
1989
1990 ASSERT(dip->di_next_unlinked == cpu_to_be32(NULLAGINO));
1991 dip->di_next_unlinked = agi->agi_unlinked[bucket_index];
1992 offset = ip->i_imap.im_boffset +
1993 offsetof(xfs_dinode_t, di_next_unlinked);
1994
1995 /* need to recalc the inode CRC if appropriate */
1996 xfs_dinode_calc_crc(mp, dip);
1997
1998 xfs_trans_inode_buf(tp, ibp);
1999 xfs_trans_log_buf(tp, ibp, offset,
2000 (offset + sizeof(xfs_agino_t) - 1));
2001 xfs_inobp_check(mp, ibp);
2002 }
2003
2004 /*
2005 * Point the bucket head pointer at the inode being inserted.
2006 */
2007 ASSERT(agino != 0);
2008 agi->agi_unlinked[bucket_index] = cpu_to_be32(agino);
2009 offset = offsetof(xfs_agi_t, agi_unlinked) +
2010 (sizeof(xfs_agino_t) * bucket_index);
2011 xfs_trans_buf_set_type(tp, agibp, XFS_BLFT_AGI_BUF);
2012 xfs_trans_log_buf(tp, agibp, offset,
2013 (offset + sizeof(xfs_agino_t) - 1));
2014 return 0;
2015}
2016
2017/*
2018 * Pull the on-disk inode from the AGI unlinked list.
2019 */
2020STATIC int
2021xfs_iunlink_remove(
2022 xfs_trans_t *tp,
2023 xfs_inode_t *ip)
2024{
2025 xfs_ino_t next_ino;
2026 xfs_mount_t *mp;
2027 xfs_agi_t *agi;
2028 xfs_dinode_t *dip;
2029 xfs_buf_t *agibp;
2030 xfs_buf_t *ibp;
2031 xfs_agnumber_t agno;
2032 xfs_agino_t agino;
2033 xfs_agino_t next_agino;
2034 xfs_buf_t *last_ibp;
2035 xfs_dinode_t *last_dip = NULL;
2036 short bucket_index;
2037 int offset, last_offset = 0;
2038 int error;
2039
2040 mp = tp->t_mountp;
2041 agno = XFS_INO_TO_AGNO(mp, ip->i_ino);
2042
2043 /*
2044 * Get the agi buffer first. It ensures lock ordering
2045 * on the list.
2046 */
2047 error = xfs_read_agi(mp, tp, agno, &agibp);
2048 if (error)
2049 return error;
2050
2051 agi = XFS_BUF_TO_AGI(agibp);
2052
2053 /*
2054 * Get the index into the agi hash table for the
2055 * list this inode will go on.
2056 */
2057 agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
2058 ASSERT(agino != 0);
2059 bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
2060 ASSERT(agi->agi_unlinked[bucket_index] != cpu_to_be32(NULLAGINO));
2061 ASSERT(agi->agi_unlinked[bucket_index]);
2062
2063 if (be32_to_cpu(agi->agi_unlinked[bucket_index]) == agino) {
2064 /*
2065 * We're at the head of the list. Get the inode's on-disk
2066 * buffer to see if there is anyone after us on the list.
2067 * Only modify our next pointer if it is not already NULLAGINO.
2068 * This saves us the overhead of dealing with the buffer when
2069 * there is no need to change it.
2070 */
2071 error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
2072 0, 0);
2073 if (error) {
2074 xfs_warn(mp, "%s: xfs_imap_to_bp returned error %d.",
2075 __func__, error);
2076 return error;
2077 }
2078 next_agino = be32_to_cpu(dip->di_next_unlinked);
2079 ASSERT(next_agino != 0);
2080 if (next_agino != NULLAGINO) {
2081 dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
2082 offset = ip->i_imap.im_boffset +
2083 offsetof(xfs_dinode_t, di_next_unlinked);
2084
2085 /* need to recalc the inode CRC if appropriate */
2086 xfs_dinode_calc_crc(mp, dip);
2087
2088 xfs_trans_inode_buf(tp, ibp);
2089 xfs_trans_log_buf(tp, ibp, offset,
2090 (offset + sizeof(xfs_agino_t) - 1));
2091 xfs_inobp_check(mp, ibp);
2092 } else {
2093 xfs_trans_brelse(tp, ibp);
2094 }
2095 /*
2096 * Point the bucket head pointer at the next inode.
2097 */
2098 ASSERT(next_agino != 0);
2099 ASSERT(next_agino != agino);
2100 agi->agi_unlinked[bucket_index] = cpu_to_be32(next_agino);
2101 offset = offsetof(xfs_agi_t, agi_unlinked) +
2102 (sizeof(xfs_agino_t) * bucket_index);
2103 xfs_trans_buf_set_type(tp, agibp, XFS_BLFT_AGI_BUF);
2104 xfs_trans_log_buf(tp, agibp, offset,
2105 (offset + sizeof(xfs_agino_t) - 1));
2106 } else {
2107 /*
2108 * We need to search the list for the inode being freed.
2109 */
2110 next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]);
2111 last_ibp = NULL;
2112 while (next_agino != agino) {
2113 struct xfs_imap imap;
2114
2115 if (last_ibp)
2116 xfs_trans_brelse(tp, last_ibp);
2117
2118 imap.im_blkno = 0;
2119 next_ino = XFS_AGINO_TO_INO(mp, agno, next_agino);
2120
2121 error = xfs_imap(mp, tp, next_ino, &imap, 0);
2122 if (error) {
2123 xfs_warn(mp,
2124 "%s: xfs_imap returned error %d.",
2125 __func__, error);
2126 return error;
2127 }
2128
2129 error = xfs_imap_to_bp(mp, tp, &imap, &last_dip,
2130 &last_ibp, 0, 0);
2131 if (error) {
2132 xfs_warn(mp,
2133 "%s: xfs_imap_to_bp returned error %d.",
2134 __func__, error);
2135 return error;
2136 }
2137
2138 last_offset = imap.im_boffset;
2139 next_agino = be32_to_cpu(last_dip->di_next_unlinked);
2140 ASSERT(next_agino != NULLAGINO);
2141 ASSERT(next_agino != 0);
2142 }
2143
2144 /*
2145 * Now last_ibp points to the buffer previous to us on the
2146 * unlinked list. Pull us from the list.
2147 */
2148 error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
2149 0, 0);
2150 if (error) {
2151 xfs_warn(mp, "%s: xfs_imap_to_bp(2) returned error %d.",
2152 __func__, error);
2153 return error;
2154 }
2155 next_agino = be32_to_cpu(dip->di_next_unlinked);
2156 ASSERT(next_agino != 0);
2157 ASSERT(next_agino != agino);
2158 if (next_agino != NULLAGINO) {
2159 dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
2160 offset = ip->i_imap.im_boffset +
2161 offsetof(xfs_dinode_t, di_next_unlinked);
2162
2163 /* need to recalc the inode CRC if appropriate */
2164 xfs_dinode_calc_crc(mp, dip);
2165
2166 xfs_trans_inode_buf(tp, ibp);
2167 xfs_trans_log_buf(tp, ibp, offset,
2168 (offset + sizeof(xfs_agino_t) - 1));
2169 xfs_inobp_check(mp, ibp);
2170 } else {
2171 xfs_trans_brelse(tp, ibp);
2172 }
2173 /*
2174 * Point the previous inode on the list to the next inode.
2175 */
2176 last_dip->di_next_unlinked = cpu_to_be32(next_agino);
2177 ASSERT(next_agino != 0);
2178 offset = last_offset + offsetof(xfs_dinode_t, di_next_unlinked);
2179
2180 /* need to recalc the inode CRC if appropriate */
2181 xfs_dinode_calc_crc(mp, last_dip);
2182
2183 xfs_trans_inode_buf(tp, last_ibp);
2184 xfs_trans_log_buf(tp, last_ibp, offset,
2185 (offset + sizeof(xfs_agino_t) - 1));
2186 xfs_inobp_check(mp, last_ibp);
2187 }
2188 return 0;
2189}
2190
2191/*
2192 * A big issue when freeing the inode cluster is that we _cannot_ skip any
2193 * inodes that are in memory - they all must be marked stale and attached to
2194 * the cluster buffer.
2195 */
2196STATIC int
2197xfs_ifree_cluster(
2198 xfs_inode_t *free_ip,
2199 xfs_trans_t *tp,
2200 struct xfs_icluster *xic)
2201{
2202 xfs_mount_t *mp = free_ip->i_mount;
2203 int blks_per_cluster;
2204 int inodes_per_cluster;
2205 int nbufs;
2206 int i, j;
2207 int ioffset;
2208 xfs_daddr_t blkno;
2209 xfs_buf_t *bp;
2210 xfs_inode_t *ip;
2211 xfs_inode_log_item_t *iip;
2212 xfs_log_item_t *lip;
2213 struct xfs_perag *pag;
2214 xfs_ino_t inum;
2215
2216 inum = xic->first_ino;
2217 pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, inum));
2218 blks_per_cluster = xfs_icluster_size_fsb(mp);
2219 inodes_per_cluster = blks_per_cluster << mp->m_sb.sb_inopblog;
2220 nbufs = mp->m_ialloc_blks / blks_per_cluster;
2221
2222 for (j = 0; j < nbufs; j++, inum += inodes_per_cluster) {
2223 /*
2224 * The allocation bitmap tells us which inodes of the chunk were
2225 * physically allocated. Skip the cluster if an inode falls into
2226 * a sparse region.
2227 */
2228 ioffset = inum - xic->first_ino;
2229 if ((xic->alloc & XFS_INOBT_MASK(ioffset)) == 0) {
2230 ASSERT(do_mod(ioffset, inodes_per_cluster) == 0);
2231 continue;
2232 }
2233
2234 blkno = XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, inum),
2235 XFS_INO_TO_AGBNO(mp, inum));
2236
2237 /*
2238 * We obtain and lock the backing buffer first in the process
2239 * here, as we have to ensure that any dirty inode that we
2240 * can't get the flush lock on is attached to the buffer.
2241 * If we scan the in-memory inodes first, then buffer IO can
2242 * complete before we get a lock on it, and hence we may fail
2243 * to mark all the active inodes on the buffer stale.
2244 */
2245 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno,
2246 mp->m_bsize * blks_per_cluster,
2247 XBF_UNMAPPED);
2248
2249 if (!bp)
2250 return -ENOMEM;
2251
2252 /*
2253 * This buffer may not have been correctly initialised as we
2254 * didn't read it from disk. That's not important because we are
2255 * only using to mark the buffer as stale in the log, and to
2256 * attach stale cached inodes on it. That means it will never be
2257 * dispatched for IO. If it is, we want to know about it, and we
2258 * want it to fail. We can acheive this by adding a write
2259 * verifier to the buffer.
2260 */
2261 bp->b_ops = &xfs_inode_buf_ops;
2262
2263 /*
2264 * Walk the inodes already attached to the buffer and mark them
2265 * stale. These will all have the flush locks held, so an
2266 * in-memory inode walk can't lock them. By marking them all
2267 * stale first, we will not attempt to lock them in the loop
2268 * below as the XFS_ISTALE flag will be set.
2269 */
2270 lip = bp->b_fspriv;
2271 while (lip) {
2272 if (lip->li_type == XFS_LI_INODE) {
2273 iip = (xfs_inode_log_item_t *)lip;
2274 ASSERT(iip->ili_logged == 1);
2275 lip->li_cb = xfs_istale_done;
2276 xfs_trans_ail_copy_lsn(mp->m_ail,
2277 &iip->ili_flush_lsn,
2278 &iip->ili_item.li_lsn);
2279 xfs_iflags_set(iip->ili_inode, XFS_ISTALE);
2280 }
2281 lip = lip->li_bio_list;
2282 }
2283
2284
2285 /*
2286 * For each inode in memory attempt to add it to the inode
2287 * buffer and set it up for being staled on buffer IO
2288 * completion. This is safe as we've locked out tail pushing
2289 * and flushing by locking the buffer.
2290 *
2291 * We have already marked every inode that was part of a
2292 * transaction stale above, which means there is no point in
2293 * even trying to lock them.
2294 */
2295 for (i = 0; i < inodes_per_cluster; i++) {
2296retry:
2297 rcu_read_lock();
2298 ip = radix_tree_lookup(&pag->pag_ici_root,
2299 XFS_INO_TO_AGINO(mp, (inum + i)));
2300
2301 /* Inode not in memory, nothing to do */
2302 if (!ip) {
2303 rcu_read_unlock();
2304 continue;
2305 }
2306
2307 /*
2308 * because this is an RCU protected lookup, we could
2309 * find a recently freed or even reallocated inode
2310 * during the lookup. We need to check under the
2311 * i_flags_lock for a valid inode here. Skip it if it
2312 * is not valid, the wrong inode or stale.
2313 */
2314 spin_lock(&ip->i_flags_lock);
2315 if (ip->i_ino != inum + i ||
2316 __xfs_iflags_test(ip, XFS_ISTALE)) {
2317 spin_unlock(&ip->i_flags_lock);
2318 rcu_read_unlock();
2319 continue;
2320 }
2321 spin_unlock(&ip->i_flags_lock);
2322
2323 /*
2324 * Don't try to lock/unlock the current inode, but we
2325 * _cannot_ skip the other inodes that we did not find
2326 * in the list attached to the buffer and are not
2327 * already marked stale. If we can't lock it, back off
2328 * and retry.
2329 */
2330 if (ip != free_ip &&
2331 !xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) {
2332 rcu_read_unlock();
2333 delay(1);
2334 goto retry;
2335 }
2336 rcu_read_unlock();
2337
2338 xfs_iflock(ip);
2339 xfs_iflags_set(ip, XFS_ISTALE);
2340
2341 /*
2342 * we don't need to attach clean inodes or those only
2343 * with unlogged changes (which we throw away, anyway).
2344 */
2345 iip = ip->i_itemp;
2346 if (!iip || xfs_inode_clean(ip)) {
2347 ASSERT(ip != free_ip);
2348 xfs_ifunlock(ip);
2349 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2350 continue;
2351 }
2352
2353 iip->ili_last_fields = iip->ili_fields;
2354 iip->ili_fields = 0;
2355 iip->ili_fsync_fields = 0;
2356 iip->ili_logged = 1;
2357 xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
2358 &iip->ili_item.li_lsn);
2359
2360 xfs_buf_attach_iodone(bp, xfs_istale_done,
2361 &iip->ili_item);
2362
2363 if (ip != free_ip)
2364 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2365 }
2366
2367 xfs_trans_stale_inode_buf(tp, bp);
2368 xfs_trans_binval(tp, bp);
2369 }
2370
2371 xfs_perag_put(pag);
2372 return 0;
2373}
2374
2375/*
2376 * This is called to return an inode to the inode free list.
2377 * The inode should already be truncated to 0 length and have
2378 * no pages associated with it. This routine also assumes that
2379 * the inode is already a part of the transaction.
2380 *
2381 * The on-disk copy of the inode will have been added to the list
2382 * of unlinked inodes in the AGI. We need to remove the inode from
2383 * that list atomically with respect to freeing it here.
2384 */
2385int
2386xfs_ifree(
2387 xfs_trans_t *tp,
2388 xfs_inode_t *ip,
2389 xfs_bmap_free_t *flist)
2390{
2391 int error;
2392 struct xfs_icluster xic = { 0 };
2393
2394 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
2395 ASSERT(VFS_I(ip)->i_nlink == 0);
2396 ASSERT(ip->i_d.di_nextents == 0);
2397 ASSERT(ip->i_d.di_anextents == 0);
2398 ASSERT(ip->i_d.di_size == 0 || !S_ISREG(VFS_I(ip)->i_mode));
2399 ASSERT(ip->i_d.di_nblocks == 0);
2400
2401 /*
2402 * Pull the on-disk inode from the AGI unlinked list.
2403 */
2404 error = xfs_iunlink_remove(tp, ip);
2405 if (error)
2406 return error;
2407
2408 error = xfs_difree(tp, ip->i_ino, flist, &xic);
2409 if (error)
2410 return error;
2411
2412 VFS_I(ip)->i_mode = 0; /* mark incore inode as free */
2413 ip->i_d.di_flags = 0;
2414 ip->i_d.di_dmevmask = 0;
2415 ip->i_d.di_forkoff = 0; /* mark the attr fork not in use */
2416 ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS;
2417 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
2418 /*
2419 * Bump the generation count so no one will be confused
2420 * by reincarnations of this inode.
2421 */
2422 VFS_I(ip)->i_generation++;
2423 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
2424
2425 if (xic.deleted)
2426 error = xfs_ifree_cluster(ip, tp, &xic);
2427
2428 return error;
2429}
2430
2431/*
2432 * This is called to unpin an inode. The caller must have the inode locked
2433 * in at least shared mode so that the buffer cannot be subsequently pinned
2434 * once someone is waiting for it to be unpinned.
2435 */
2436static void
2437xfs_iunpin(
2438 struct xfs_inode *ip)
2439{
2440 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
2441
2442 trace_xfs_inode_unpin_nowait(ip, _RET_IP_);
2443
2444 /* Give the log a push to start the unpinning I/O */
2445 xfs_log_force_lsn(ip->i_mount, ip->i_itemp->ili_last_lsn, 0);
2446
2447}
2448
2449static void
2450__xfs_iunpin_wait(
2451 struct xfs_inode *ip)
2452{
2453 wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IPINNED_BIT);
2454 DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IPINNED_BIT);
2455
2456 xfs_iunpin(ip);
2457
2458 do {
2459 prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE);
2460 if (xfs_ipincount(ip))
2461 io_schedule();
2462 } while (xfs_ipincount(ip));
2463 finish_wait(wq, &wait.wait);
2464}
2465
2466void
2467xfs_iunpin_wait(
2468 struct xfs_inode *ip)
2469{
2470 if (xfs_ipincount(ip))
2471 __xfs_iunpin_wait(ip);
2472}
2473
2474/*
2475 * Removing an inode from the namespace involves removing the directory entry
2476 * and dropping the link count on the inode. Removing the directory entry can
2477 * result in locking an AGF (directory blocks were freed) and removing a link
2478 * count can result in placing the inode on an unlinked list which results in
2479 * locking an AGI.
2480 *
2481 * The big problem here is that we have an ordering constraint on AGF and AGI
2482 * locking - inode allocation locks the AGI, then can allocate a new extent for
2483 * new inodes, locking the AGF after the AGI. Similarly, freeing the inode
2484 * removes the inode from the unlinked list, requiring that we lock the AGI
2485 * first, and then freeing the inode can result in an inode chunk being freed
2486 * and hence freeing disk space requiring that we lock an AGF.
2487 *
2488 * Hence the ordering that is imposed by other parts of the code is AGI before
2489 * AGF. This means we cannot remove the directory entry before we drop the inode
2490 * reference count and put it on the unlinked list as this results in a lock
2491 * order of AGF then AGI, and this can deadlock against inode allocation and
2492 * freeing. Therefore we must drop the link counts before we remove the
2493 * directory entry.
2494 *
2495 * This is still safe from a transactional point of view - it is not until we
2496 * get to xfs_bmap_finish() that we have the possibility of multiple
2497 * transactions in this operation. Hence as long as we remove the directory
2498 * entry and drop the link count in the first transaction of the remove
2499 * operation, there are no transactional constraints on the ordering here.
2500 */
2501int
2502xfs_remove(
2503 xfs_inode_t *dp,
2504 struct xfs_name *name,
2505 xfs_inode_t *ip)
2506{
2507 xfs_mount_t *mp = dp->i_mount;
2508 xfs_trans_t *tp = NULL;
2509 int is_dir = S_ISDIR(VFS_I(ip)->i_mode);
2510 int error = 0;
2511 xfs_bmap_free_t free_list;
2512 xfs_fsblock_t first_block;
2513 uint resblks;
2514
2515 trace_xfs_remove(dp, name);
2516
2517 if (XFS_FORCED_SHUTDOWN(mp))
2518 return -EIO;
2519
2520 error = xfs_qm_dqattach(dp, 0);
2521 if (error)
2522 goto std_return;
2523
2524 error = xfs_qm_dqattach(ip, 0);
2525 if (error)
2526 goto std_return;
2527
2528 if (is_dir)
2529 tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
2530 else
2531 tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
2532
2533 /*
2534 * We try to get the real space reservation first,
2535 * allowing for directory btree deletion(s) implying
2536 * possible bmap insert(s). If we can't get the space
2537 * reservation then we use 0 instead, and avoid the bmap
2538 * btree insert(s) in the directory code by, if the bmap
2539 * insert tries to happen, instead trimming the LAST
2540 * block from the directory.
2541 */
2542 resblks = XFS_REMOVE_SPACE_RES(mp);
2543 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_remove, resblks, 0);
2544 if (error == -ENOSPC) {
2545 resblks = 0;
2546 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_remove, 0, 0);
2547 }
2548 if (error) {
2549 ASSERT(error != -ENOSPC);
2550 goto out_trans_cancel;
2551 }
2552
2553 xfs_ilock(dp, XFS_IOLOCK_EXCL | XFS_IOLOCK_PARENT);
2554 xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);
2555
2556 xfs_trans_ijoin(tp, dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
2557 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
2558
2559 /*
2560 * If we're removing a directory perform some additional validation.
2561 */
2562 if (is_dir) {
2563 ASSERT(VFS_I(ip)->i_nlink >= 2);
2564 if (VFS_I(ip)->i_nlink != 2) {
2565 error = -ENOTEMPTY;
2566 goto out_trans_cancel;
2567 }
2568 if (!xfs_dir_isempty(ip)) {
2569 error = -ENOTEMPTY;
2570 goto out_trans_cancel;
2571 }
2572
2573 /* Drop the link from ip's "..". */
2574 error = xfs_droplink(tp, dp);
2575 if (error)
2576 goto out_trans_cancel;
2577
2578 /* Drop the "." link from ip to self. */
2579 error = xfs_droplink(tp, ip);
2580 if (error)
2581 goto out_trans_cancel;
2582 } else {
2583 /*
2584 * When removing a non-directory we need to log the parent
2585 * inode here. For a directory this is done implicitly
2586 * by the xfs_droplink call for the ".." entry.
2587 */
2588 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
2589 }
2590 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2591
2592 /* Drop the link from dp to ip. */
2593 error = xfs_droplink(tp, ip);
2594 if (error)
2595 goto out_trans_cancel;
2596
2597 xfs_bmap_init(&free_list, &first_block);
2598 error = xfs_dir_removename(tp, dp, name, ip->i_ino,
2599 &first_block, &free_list, resblks);
2600 if (error) {
2601 ASSERT(error != -ENOENT);
2602 goto out_bmap_cancel;
2603 }
2604
2605 /*
2606 * If this is a synchronous mount, make sure that the
2607 * remove transaction goes to disk before returning to
2608 * the user.
2609 */
2610 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
2611 xfs_trans_set_sync(tp);
2612
2613 error = xfs_bmap_finish(&tp, &free_list, NULL);
2614 if (error)
2615 goto out_bmap_cancel;
2616
2617 error = xfs_trans_commit(tp);
2618 if (error)
2619 goto std_return;
2620
2621 if (is_dir && xfs_inode_is_filestream(ip))
2622 xfs_filestream_deassociate(ip);
2623
2624 return 0;
2625
2626 out_bmap_cancel:
2627 xfs_bmap_cancel(&free_list);
2628 out_trans_cancel:
2629 xfs_trans_cancel(tp);
2630 std_return:
2631 return error;
2632}
2633
2634/*
2635 * Enter all inodes for a rename transaction into a sorted array.
2636 */
2637#define __XFS_SORT_INODES 5
2638STATIC void
2639xfs_sort_for_rename(
2640 struct xfs_inode *dp1, /* in: old (source) directory inode */
2641 struct xfs_inode *dp2, /* in: new (target) directory inode */
2642 struct xfs_inode *ip1, /* in: inode of old entry */
2643 struct xfs_inode *ip2, /* in: inode of new entry */
2644 struct xfs_inode *wip, /* in: whiteout inode */
2645 struct xfs_inode **i_tab,/* out: sorted array of inodes */
2646 int *num_inodes) /* in/out: inodes in array */
2647{
2648 int i, j;
2649
2650 ASSERT(*num_inodes == __XFS_SORT_INODES);
2651 memset(i_tab, 0, *num_inodes * sizeof(struct xfs_inode *));
2652
2653 /*
2654 * i_tab contains a list of pointers to inodes. We initialize
2655 * the table here & we'll sort it. We will then use it to
2656 * order the acquisition of the inode locks.
2657 *
2658 * Note that the table may contain duplicates. e.g., dp1 == dp2.
2659 */
2660 i = 0;
2661 i_tab[i++] = dp1;
2662 i_tab[i++] = dp2;
2663 i_tab[i++] = ip1;
2664 if (ip2)
2665 i_tab[i++] = ip2;
2666 if (wip)
2667 i_tab[i++] = wip;
2668 *num_inodes = i;
2669
2670 /*
2671 * Sort the elements via bubble sort. (Remember, there are at
2672 * most 5 elements to sort, so this is adequate.)
2673 */
2674 for (i = 0; i < *num_inodes; i++) {
2675 for (j = 1; j < *num_inodes; j++) {
2676 if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
2677 struct xfs_inode *temp = i_tab[j];
2678 i_tab[j] = i_tab[j-1];
2679 i_tab[j-1] = temp;
2680 }
2681 }
2682 }
2683}
2684
2685static int
2686xfs_finish_rename(
2687 struct xfs_trans *tp,
2688 struct xfs_bmap_free *free_list)
2689{
2690 int error;
2691
2692 /*
2693 * If this is a synchronous mount, make sure that the rename transaction
2694 * goes to disk before returning to the user.
2695 */
2696 if (tp->t_mountp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
2697 xfs_trans_set_sync(tp);
2698
2699 error = xfs_bmap_finish(&tp, free_list, NULL);
2700 if (error) {
2701 xfs_bmap_cancel(free_list);
2702 xfs_trans_cancel(tp);
2703 return error;
2704 }
2705
2706 return xfs_trans_commit(tp);
2707}
2708
2709/*
2710 * xfs_cross_rename()
2711 *
2712 * responsible for handling RENAME_EXCHANGE flag in renameat2() sytemcall
2713 */
2714STATIC int
2715xfs_cross_rename(
2716 struct xfs_trans *tp,
2717 struct xfs_inode *dp1,
2718 struct xfs_name *name1,
2719 struct xfs_inode *ip1,
2720 struct xfs_inode *dp2,
2721 struct xfs_name *name2,
2722 struct xfs_inode *ip2,
2723 struct xfs_bmap_free *free_list,
2724 xfs_fsblock_t *first_block,
2725 int spaceres)
2726{
2727 int error = 0;
2728 int ip1_flags = 0;
2729 int ip2_flags = 0;
2730 int dp2_flags = 0;
2731
2732 /* Swap inode number for dirent in first parent */
2733 error = xfs_dir_replace(tp, dp1, name1,
2734 ip2->i_ino,
2735 first_block, free_list, spaceres);
2736 if (error)
2737 goto out_trans_abort;
2738
2739 /* Swap inode number for dirent in second parent */
2740 error = xfs_dir_replace(tp, dp2, name2,
2741 ip1->i_ino,
2742 first_block, free_list, spaceres);
2743 if (error)
2744 goto out_trans_abort;
2745
2746 /*
2747 * If we're renaming one or more directories across different parents,
2748 * update the respective ".." entries (and link counts) to match the new
2749 * parents.
2750 */
2751 if (dp1 != dp2) {
2752 dp2_flags = XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
2753
2754 if (S_ISDIR(VFS_I(ip2)->i_mode)) {
2755 error = xfs_dir_replace(tp, ip2, &xfs_name_dotdot,
2756 dp1->i_ino, first_block,
2757 free_list, spaceres);
2758 if (error)
2759 goto out_trans_abort;
2760
2761 /* transfer ip2 ".." reference to dp1 */
2762 if (!S_ISDIR(VFS_I(ip1)->i_mode)) {
2763 error = xfs_droplink(tp, dp2);
2764 if (error)
2765 goto out_trans_abort;
2766 error = xfs_bumplink(tp, dp1);
2767 if (error)
2768 goto out_trans_abort;
2769 }
2770
2771 /*
2772 * Although ip1 isn't changed here, userspace needs
2773 * to be warned about the change, so that applications
2774 * relying on it (like backup ones), will properly
2775 * notify the change
2776 */
2777 ip1_flags |= XFS_ICHGTIME_CHG;
2778 ip2_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
2779 }
2780
2781 if (S_ISDIR(VFS_I(ip1)->i_mode)) {
2782 error = xfs_dir_replace(tp, ip1, &xfs_name_dotdot,
2783 dp2->i_ino, first_block,
2784 free_list, spaceres);
2785 if (error)
2786 goto out_trans_abort;
2787
2788 /* transfer ip1 ".." reference to dp2 */
2789 if (!S_ISDIR(VFS_I(ip2)->i_mode)) {
2790 error = xfs_droplink(tp, dp1);
2791 if (error)
2792 goto out_trans_abort;
2793 error = xfs_bumplink(tp, dp2);
2794 if (error)
2795 goto out_trans_abort;
2796 }
2797
2798 /*
2799 * Although ip2 isn't changed here, userspace needs
2800 * to be warned about the change, so that applications
2801 * relying on it (like backup ones), will properly
2802 * notify the change
2803 */
2804 ip1_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
2805 ip2_flags |= XFS_ICHGTIME_CHG;
2806 }
2807 }
2808
2809 if (ip1_flags) {
2810 xfs_trans_ichgtime(tp, ip1, ip1_flags);
2811 xfs_trans_log_inode(tp, ip1, XFS_ILOG_CORE);
2812 }
2813 if (ip2_flags) {
2814 xfs_trans_ichgtime(tp, ip2, ip2_flags);
2815 xfs_trans_log_inode(tp, ip2, XFS_ILOG_CORE);
2816 }
2817 if (dp2_flags) {
2818 xfs_trans_ichgtime(tp, dp2, dp2_flags);
2819 xfs_trans_log_inode(tp, dp2, XFS_ILOG_CORE);
2820 }
2821 xfs_trans_ichgtime(tp, dp1, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2822 xfs_trans_log_inode(tp, dp1, XFS_ILOG_CORE);
2823 return xfs_finish_rename(tp, free_list);
2824
2825out_trans_abort:
2826 xfs_bmap_cancel(free_list);
2827 xfs_trans_cancel(tp);
2828 return error;
2829}
2830
2831/*
2832 * xfs_rename_alloc_whiteout()
2833 *
2834 * Return a referenced, unlinked, unlocked inode that that can be used as a
2835 * whiteout in a rename transaction. We use a tmpfile inode here so that if we
2836 * crash between allocating the inode and linking it into the rename transaction
2837 * recovery will free the inode and we won't leak it.
2838 */
2839static int
2840xfs_rename_alloc_whiteout(
2841 struct xfs_inode *dp,
2842 struct xfs_inode **wip)
2843{
2844 struct xfs_inode *tmpfile;
2845 int error;
2846
2847 error = xfs_create_tmpfile(dp, NULL, S_IFCHR | WHITEOUT_MODE, &tmpfile);
2848 if (error)
2849 return error;
2850
2851 /*
2852 * Prepare the tmpfile inode as if it were created through the VFS.
2853 * Otherwise, the link increment paths will complain about nlink 0->1.
2854 * Drop the link count as done by d_tmpfile(), complete the inode setup
2855 * and flag it as linkable.
2856 */
2857 drop_nlink(VFS_I(tmpfile));
2858 xfs_finish_inode_setup(tmpfile);
2859 VFS_I(tmpfile)->i_state |= I_LINKABLE;
2860
2861 *wip = tmpfile;
2862 return 0;
2863}
2864
2865/*
2866 * xfs_rename
2867 */
2868int
2869xfs_rename(
2870 struct xfs_inode *src_dp,
2871 struct xfs_name *src_name,
2872 struct xfs_inode *src_ip,
2873 struct xfs_inode *target_dp,
2874 struct xfs_name *target_name,
2875 struct xfs_inode *target_ip,
2876 unsigned int flags)
2877{
2878 struct xfs_mount *mp = src_dp->i_mount;
2879 struct xfs_trans *tp;
2880 struct xfs_bmap_free free_list;
2881 xfs_fsblock_t first_block;
2882 struct xfs_inode *wip = NULL; /* whiteout inode */
2883 struct xfs_inode *inodes[__XFS_SORT_INODES];
2884 int num_inodes = __XFS_SORT_INODES;
2885 bool new_parent = (src_dp != target_dp);
2886 bool src_is_directory = S_ISDIR(VFS_I(src_ip)->i_mode);
2887 int spaceres;
2888 int error;
2889
2890 trace_xfs_rename(src_dp, target_dp, src_name, target_name);
2891
2892 if ((flags & RENAME_EXCHANGE) && !target_ip)
2893 return -EINVAL;
2894
2895 /*
2896 * If we are doing a whiteout operation, allocate the whiteout inode
2897 * we will be placing at the target and ensure the type is set
2898 * appropriately.
2899 */
2900 if (flags & RENAME_WHITEOUT) {
2901 ASSERT(!(flags & (RENAME_NOREPLACE | RENAME_EXCHANGE)));
2902 error = xfs_rename_alloc_whiteout(target_dp, &wip);
2903 if (error)
2904 return error;
2905
2906 /* setup target dirent info as whiteout */
2907 src_name->type = XFS_DIR3_FT_CHRDEV;
2908 }
2909
2910 xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip, wip,
2911 inodes, &num_inodes);
2912
2913 tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
2914 spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
2915 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_rename, spaceres, 0);
2916 if (error == -ENOSPC) {
2917 spaceres = 0;
2918 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_rename, 0, 0);
2919 }
2920 if (error)
2921 goto out_trans_cancel;
2922
2923 /*
2924 * Attach the dquots to the inodes
2925 */
2926 error = xfs_qm_vop_rename_dqattach(inodes);
2927 if (error)
2928 goto out_trans_cancel;
2929
2930 /*
2931 * Lock all the participating inodes. Depending upon whether
2932 * the target_name exists in the target directory, and
2933 * whether the target directory is the same as the source
2934 * directory, we can lock from 2 to 4 inodes.
2935 */
2936 if (!new_parent)
2937 xfs_ilock(src_dp, XFS_IOLOCK_EXCL | XFS_IOLOCK_PARENT);
2938 else
2939 xfs_lock_two_inodes(src_dp, target_dp,
2940 XFS_IOLOCK_EXCL | XFS_IOLOCK_PARENT);
2941
2942 xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
2943
2944 /*
2945 * Join all the inodes to the transaction. From this point on,
2946 * we can rely on either trans_commit or trans_cancel to unlock
2947 * them.
2948 */
2949 xfs_trans_ijoin(tp, src_dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
2950 if (new_parent)
2951 xfs_trans_ijoin(tp, target_dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
2952 xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
2953 if (target_ip)
2954 xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
2955 if (wip)
2956 xfs_trans_ijoin(tp, wip, XFS_ILOCK_EXCL);
2957
2958 /*
2959 * If we are using project inheritance, we only allow renames
2960 * into our tree when the project IDs are the same; else the
2961 * tree quota mechanism would be circumvented.
2962 */
2963 if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
2964 (xfs_get_projid(target_dp) != xfs_get_projid(src_ip)))) {
2965 error = -EXDEV;
2966 goto out_trans_cancel;
2967 }
2968
2969 xfs_bmap_init(&free_list, &first_block);
2970
2971 /* RENAME_EXCHANGE is unique from here on. */
2972 if (flags & RENAME_EXCHANGE)
2973 return xfs_cross_rename(tp, src_dp, src_name, src_ip,
2974 target_dp, target_name, target_ip,
2975 &free_list, &first_block, spaceres);
2976
2977 /*
2978 * Set up the target.
2979 */
2980 if (target_ip == NULL) {
2981 /*
2982 * If there's no space reservation, check the entry will
2983 * fit before actually inserting it.
2984 */
2985 if (!spaceres) {
2986 error = xfs_dir_canenter(tp, target_dp, target_name);
2987 if (error)
2988 goto out_trans_cancel;
2989 }
2990 /*
2991 * If target does not exist and the rename crosses
2992 * directories, adjust the target directory link count
2993 * to account for the ".." reference from the new entry.
2994 */
2995 error = xfs_dir_createname(tp, target_dp, target_name,
2996 src_ip->i_ino, &first_block,
2997 &free_list, spaceres);
2998 if (error)
2999 goto out_bmap_cancel;
3000
3001 xfs_trans_ichgtime(tp, target_dp,
3002 XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
3003
3004 if (new_parent && src_is_directory) {
3005 error = xfs_bumplink(tp, target_dp);
3006 if (error)
3007 goto out_bmap_cancel;
3008 }
3009 } else { /* target_ip != NULL */
3010 /*
3011 * If target exists and it's a directory, check that both
3012 * target and source are directories and that target can be
3013 * destroyed, or that neither is a directory.
3014 */
3015 if (S_ISDIR(VFS_I(target_ip)->i_mode)) {
3016 /*
3017 * Make sure target dir is empty.
3018 */
3019 if (!(xfs_dir_isempty(target_ip)) ||
3020 (VFS_I(target_ip)->i_nlink > 2)) {
3021 error = -EEXIST;
3022 goto out_trans_cancel;
3023 }
3024 }
3025
3026 /*
3027 * Link the source inode under the target name.
3028 * If the source inode is a directory and we are moving
3029 * it across directories, its ".." entry will be
3030 * inconsistent until we replace that down below.
3031 *
3032 * In case there is already an entry with the same
3033 * name at the destination directory, remove it first.
3034 */
3035 error = xfs_dir_replace(tp, target_dp, target_name,
3036 src_ip->i_ino,
3037 &first_block, &free_list, spaceres);
3038 if (error)
3039 goto out_bmap_cancel;
3040
3041 xfs_trans_ichgtime(tp, target_dp,
3042 XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
3043
3044 /*
3045 * Decrement the link count on the target since the target
3046 * dir no longer points to it.
3047 */
3048 error = xfs_droplink(tp, target_ip);
3049 if (error)
3050 goto out_bmap_cancel;
3051
3052 if (src_is_directory) {
3053 /*
3054 * Drop the link from the old "." entry.
3055 */
3056 error = xfs_droplink(tp, target_ip);
3057 if (error)
3058 goto out_bmap_cancel;
3059 }
3060 } /* target_ip != NULL */
3061
3062 /*
3063 * Remove the source.
3064 */
3065 if (new_parent && src_is_directory) {
3066 /*
3067 * Rewrite the ".." entry to point to the new
3068 * directory.
3069 */
3070 error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
3071 target_dp->i_ino,
3072 &first_block, &free_list, spaceres);
3073 ASSERT(error != -EEXIST);
3074 if (error)
3075 goto out_bmap_cancel;
3076 }
3077
3078 /*
3079 * We always want to hit the ctime on the source inode.
3080 *
3081 * This isn't strictly required by the standards since the source
3082 * inode isn't really being changed, but old unix file systems did
3083 * it and some incremental backup programs won't work without it.
3084 */
3085 xfs_trans_ichgtime(tp, src_ip, XFS_ICHGTIME_CHG);
3086 xfs_trans_log_inode(tp, src_ip, XFS_ILOG_CORE);
3087
3088 /*
3089 * Adjust the link count on src_dp. This is necessary when
3090 * renaming a directory, either within one parent when
3091 * the target existed, or across two parent directories.
3092 */
3093 if (src_is_directory && (new_parent || target_ip != NULL)) {
3094
3095 /*
3096 * Decrement link count on src_directory since the
3097 * entry that's moved no longer points to it.
3098 */
3099 error = xfs_droplink(tp, src_dp);
3100 if (error)
3101 goto out_bmap_cancel;
3102 }
3103
3104 /*
3105 * For whiteouts, we only need to update the source dirent with the
3106 * inode number of the whiteout inode rather than removing it
3107 * altogether.
3108 */
3109 if (wip) {
3110 error = xfs_dir_replace(tp, src_dp, src_name, wip->i_ino,
3111 &first_block, &free_list, spaceres);
3112 } else
3113 error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
3114 &first_block, &free_list, spaceres);
3115 if (error)
3116 goto out_bmap_cancel;
3117
3118 /*
3119 * For whiteouts, we need to bump the link count on the whiteout inode.
3120 * This means that failures all the way up to this point leave the inode
3121 * on the unlinked list and so cleanup is a simple matter of dropping
3122 * the remaining reference to it. If we fail here after bumping the link
3123 * count, we're shutting down the filesystem so we'll never see the
3124 * intermediate state on disk.
3125 */
3126 if (wip) {
3127 ASSERT(VFS_I(wip)->i_nlink == 0);
3128 error = xfs_bumplink(tp, wip);
3129 if (error)
3130 goto out_bmap_cancel;
3131 error = xfs_iunlink_remove(tp, wip);
3132 if (error)
3133 goto out_bmap_cancel;
3134 xfs_trans_log_inode(tp, wip, XFS_ILOG_CORE);
3135
3136 /*
3137 * Now we have a real link, clear the "I'm a tmpfile" state
3138 * flag from the inode so it doesn't accidentally get misused in
3139 * future.
3140 */
3141 VFS_I(wip)->i_state &= ~I_LINKABLE;
3142 }
3143
3144 xfs_trans_ichgtime(tp, src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
3145 xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
3146 if (new_parent)
3147 xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
3148
3149 error = xfs_finish_rename(tp, &free_list);
3150 if (wip)
3151 IRELE(wip);
3152 return error;
3153
3154out_bmap_cancel:
3155 xfs_bmap_cancel(&free_list);
3156out_trans_cancel:
3157 xfs_trans_cancel(tp);
3158 if (wip)
3159 IRELE(wip);
3160 return error;
3161}
3162
3163STATIC int
3164xfs_iflush_cluster(
3165 xfs_inode_t *ip,
3166 xfs_buf_t *bp)
3167{
3168 xfs_mount_t *mp = ip->i_mount;
3169 struct xfs_perag *pag;
3170 unsigned long first_index, mask;
3171 unsigned long inodes_per_cluster;
3172 int ilist_size;
3173 xfs_inode_t **ilist;
3174 xfs_inode_t *iq;
3175 int nr_found;
3176 int clcount = 0;
3177 int bufwasdelwri;
3178 int i;
3179
3180 pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
3181
3182 inodes_per_cluster = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
3183 ilist_size = inodes_per_cluster * sizeof(xfs_inode_t *);
3184 ilist = kmem_alloc(ilist_size, KM_MAYFAIL|KM_NOFS);
3185 if (!ilist)
3186 goto out_put;
3187
3188 mask = ~(((mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog)) - 1);
3189 first_index = XFS_INO_TO_AGINO(mp, ip->i_ino) & mask;
3190 rcu_read_lock();
3191 /* really need a gang lookup range call here */
3192 nr_found = radix_tree_gang_lookup(&pag->pag_ici_root, (void**)ilist,
3193 first_index, inodes_per_cluster);
3194 if (nr_found == 0)
3195 goto out_free;
3196
3197 for (i = 0; i < nr_found; i++) {
3198 iq = ilist[i];
3199 if (iq == ip)
3200 continue;
3201
3202 /*
3203 * because this is an RCU protected lookup, we could find a
3204 * recently freed or even reallocated inode during the lookup.
3205 * We need to check under the i_flags_lock for a valid inode
3206 * here. Skip it if it is not valid or the wrong inode.
3207 */
3208 spin_lock(&ip->i_flags_lock);
3209 if (!ip->i_ino ||
3210 (XFS_INO_TO_AGINO(mp, iq->i_ino) & mask) != first_index) {
3211 spin_unlock(&ip->i_flags_lock);
3212 continue;
3213 }
3214 spin_unlock(&ip->i_flags_lock);
3215
3216 /*
3217 * Do an un-protected check to see if the inode is dirty and
3218 * is a candidate for flushing. These checks will be repeated
3219 * later after the appropriate locks are acquired.
3220 */
3221 if (xfs_inode_clean(iq) && xfs_ipincount(iq) == 0)
3222 continue;
3223
3224 /*
3225 * Try to get locks. If any are unavailable or it is pinned,
3226 * then this inode cannot be flushed and is skipped.
3227 */
3228
3229 if (!xfs_ilock_nowait(iq, XFS_ILOCK_SHARED))
3230 continue;
3231 if (!xfs_iflock_nowait(iq)) {
3232 xfs_iunlock(iq, XFS_ILOCK_SHARED);
3233 continue;
3234 }
3235 if (xfs_ipincount(iq)) {
3236 xfs_ifunlock(iq);
3237 xfs_iunlock(iq, XFS_ILOCK_SHARED);
3238 continue;
3239 }
3240
3241 /*
3242 * arriving here means that this inode can be flushed. First
3243 * re-check that it's dirty before flushing.
3244 */
3245 if (!xfs_inode_clean(iq)) {
3246 int error;
3247 error = xfs_iflush_int(iq, bp);
3248 if (error) {
3249 xfs_iunlock(iq, XFS_ILOCK_SHARED);
3250 goto cluster_corrupt_out;
3251 }
3252 clcount++;
3253 } else {
3254 xfs_ifunlock(iq);
3255 }
3256 xfs_iunlock(iq, XFS_ILOCK_SHARED);
3257 }
3258
3259 if (clcount) {
3260 XFS_STATS_INC(mp, xs_icluster_flushcnt);
3261 XFS_STATS_ADD(mp, xs_icluster_flushinode, clcount);
3262 }
3263
3264out_free:
3265 rcu_read_unlock();
3266 kmem_free(ilist);
3267out_put:
3268 xfs_perag_put(pag);
3269 return 0;
3270
3271
3272cluster_corrupt_out:
3273 /*
3274 * Corruption detected in the clustering loop. Invalidate the
3275 * inode buffer and shut down the filesystem.
3276 */
3277 rcu_read_unlock();
3278 /*
3279 * Clean up the buffer. If it was delwri, just release it --
3280 * brelse can handle it with no problems. If not, shut down the
3281 * filesystem before releasing the buffer.
3282 */
3283 bufwasdelwri = (bp->b_flags & _XBF_DELWRI_Q);
3284 if (bufwasdelwri)
3285 xfs_buf_relse(bp);
3286
3287 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
3288
3289 if (!bufwasdelwri) {
3290 /*
3291 * Just like incore_relse: if we have b_iodone functions,
3292 * mark the buffer as an error and call them. Otherwise
3293 * mark it as stale and brelse.
3294 */
3295 if (bp->b_iodone) {
3296 bp->b_flags &= ~XBF_DONE;
3297 xfs_buf_stale(bp);
3298 xfs_buf_ioerror(bp, -EIO);
3299 xfs_buf_ioend(bp);
3300 } else {
3301 xfs_buf_stale(bp);
3302 xfs_buf_relse(bp);
3303 }
3304 }
3305
3306 /*
3307 * Unlocks the flush lock
3308 */
3309 xfs_iflush_abort(iq, false);
3310 kmem_free(ilist);
3311 xfs_perag_put(pag);
3312 return -EFSCORRUPTED;
3313}
3314
3315/*
3316 * Flush dirty inode metadata into the backing buffer.
3317 *
3318 * The caller must have the inode lock and the inode flush lock held. The
3319 * inode lock will still be held upon return to the caller, and the inode
3320 * flush lock will be released after the inode has reached the disk.
3321 *
3322 * The caller must write out the buffer returned in *bpp and release it.
3323 */
3324int
3325xfs_iflush(
3326 struct xfs_inode *ip,
3327 struct xfs_buf **bpp)
3328{
3329 struct xfs_mount *mp = ip->i_mount;
3330 struct xfs_buf *bp;
3331 struct xfs_dinode *dip;
3332 int error;
3333
3334 XFS_STATS_INC(mp, xs_iflush_count);
3335
3336 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
3337 ASSERT(xfs_isiflocked(ip));
3338 ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
3339 ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK));
3340
3341 *bpp = NULL;
3342
3343 xfs_iunpin_wait(ip);
3344
3345 /*
3346 * For stale inodes we cannot rely on the backing buffer remaining
3347 * stale in cache for the remaining life of the stale inode and so
3348 * xfs_imap_to_bp() below may give us a buffer that no longer contains
3349 * inodes below. We have to check this after ensuring the inode is
3350 * unpinned so that it is safe to reclaim the stale inode after the
3351 * flush call.
3352 */
3353 if (xfs_iflags_test(ip, XFS_ISTALE)) {
3354 xfs_ifunlock(ip);
3355 return 0;
3356 }
3357
3358 /*
3359 * This may have been unpinned because the filesystem is shutting
3360 * down forcibly. If that's the case we must not write this inode
3361 * to disk, because the log record didn't make it to disk.
3362 *
3363 * We also have to remove the log item from the AIL in this case,
3364 * as we wait for an empty AIL as part of the unmount process.
3365 */
3366 if (XFS_FORCED_SHUTDOWN(mp)) {
3367 error = -EIO;
3368 goto abort_out;
3369 }
3370
3371 /*
3372 * Get the buffer containing the on-disk inode.
3373 */
3374 error = xfs_imap_to_bp(mp, NULL, &ip->i_imap, &dip, &bp, XBF_TRYLOCK,
3375 0);
3376 if (error || !bp) {
3377 xfs_ifunlock(ip);
3378 return error;
3379 }
3380
3381 /*
3382 * First flush out the inode that xfs_iflush was called with.
3383 */
3384 error = xfs_iflush_int(ip, bp);
3385 if (error)
3386 goto corrupt_out;
3387
3388 /*
3389 * If the buffer is pinned then push on the log now so we won't
3390 * get stuck waiting in the write for too long.
3391 */
3392 if (xfs_buf_ispinned(bp))
3393 xfs_log_force(mp, 0);
3394
3395 /*
3396 * inode clustering:
3397 * see if other inodes can be gathered into this write
3398 */
3399 error = xfs_iflush_cluster(ip, bp);
3400 if (error)
3401 goto cluster_corrupt_out;
3402
3403 *bpp = bp;
3404 return 0;
3405
3406corrupt_out:
3407 xfs_buf_relse(bp);
3408 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
3409cluster_corrupt_out:
3410 error = -EFSCORRUPTED;
3411abort_out:
3412 /*
3413 * Unlocks the flush lock
3414 */
3415 xfs_iflush_abort(ip, false);
3416 return error;
3417}
3418
3419STATIC int
3420xfs_iflush_int(
3421 struct xfs_inode *ip,
3422 struct xfs_buf *bp)
3423{
3424 struct xfs_inode_log_item *iip = ip->i_itemp;
3425 struct xfs_dinode *dip;
3426 struct xfs_mount *mp = ip->i_mount;
3427
3428 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
3429 ASSERT(xfs_isiflocked(ip));
3430 ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
3431 ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK));
3432 ASSERT(iip != NULL && iip->ili_fields != 0);
3433 ASSERT(ip->i_d.di_version > 1);
3434
3435 /* set *dip = inode's place in the buffer */
3436 dip = xfs_buf_offset(bp, ip->i_imap.im_boffset);
3437
3438 if (XFS_TEST_ERROR(dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC),
3439 mp, XFS_ERRTAG_IFLUSH_1, XFS_RANDOM_IFLUSH_1)) {
3440 xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
3441 "%s: Bad inode %Lu magic number 0x%x, ptr 0x%p",
3442 __func__, ip->i_ino, be16_to_cpu(dip->di_magic), dip);
3443 goto corrupt_out;
3444 }
3445 if (S_ISREG(VFS_I(ip)->i_mode)) {
3446 if (XFS_TEST_ERROR(
3447 (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) &&
3448 (ip->i_d.di_format != XFS_DINODE_FMT_BTREE),
3449 mp, XFS_ERRTAG_IFLUSH_3, XFS_RANDOM_IFLUSH_3)) {
3450 xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
3451 "%s: Bad regular inode %Lu, ptr 0x%p",
3452 __func__, ip->i_ino, ip);
3453 goto corrupt_out;
3454 }
3455 } else if (S_ISDIR(VFS_I(ip)->i_mode)) {
3456 if (XFS_TEST_ERROR(
3457 (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) &&
3458 (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
3459 (ip->i_d.di_format != XFS_DINODE_FMT_LOCAL),
3460 mp, XFS_ERRTAG_IFLUSH_4, XFS_RANDOM_IFLUSH_4)) {
3461 xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
3462 "%s: Bad directory inode %Lu, ptr 0x%p",
3463 __func__, ip->i_ino, ip);
3464 goto corrupt_out;
3465 }
3466 }
3467 if (XFS_TEST_ERROR(ip->i_d.di_nextents + ip->i_d.di_anextents >
3468 ip->i_d.di_nblocks, mp, XFS_ERRTAG_IFLUSH_5,
3469 XFS_RANDOM_IFLUSH_5)) {
3470 xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
3471 "%s: detected corrupt incore inode %Lu, "
3472 "total extents = %d, nblocks = %Ld, ptr 0x%p",
3473 __func__, ip->i_ino,
3474 ip->i_d.di_nextents + ip->i_d.di_anextents,
3475 ip->i_d.di_nblocks, ip);
3476 goto corrupt_out;
3477 }
3478 if (XFS_TEST_ERROR(ip->i_d.di_forkoff > mp->m_sb.sb_inodesize,
3479 mp, XFS_ERRTAG_IFLUSH_6, XFS_RANDOM_IFLUSH_6)) {
3480 xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
3481 "%s: bad inode %Lu, forkoff 0x%x, ptr 0x%p",
3482 __func__, ip->i_ino, ip->i_d.di_forkoff, ip);
3483 goto corrupt_out;
3484 }
3485
3486 /*
3487 * Inode item log recovery for v2 inodes are dependent on the
3488 * di_flushiter count for correct sequencing. We bump the flush
3489 * iteration count so we can detect flushes which postdate a log record
3490 * during recovery. This is redundant as we now log every change and
3491 * hence this can't happen but we need to still do it to ensure
3492 * backwards compatibility with old kernels that predate logging all
3493 * inode changes.
3494 */
3495 if (ip->i_d.di_version < 3)
3496 ip->i_d.di_flushiter++;
3497
3498 /*
3499 * Copy the dirty parts of the inode into the on-disk inode. We always
3500 * copy out the core of the inode, because if the inode is dirty at all
3501 * the core must be.
3502 */
3503 xfs_inode_to_disk(ip, dip, iip->ili_item.li_lsn);
3504
3505 /* Wrap, we never let the log put out DI_MAX_FLUSH */
3506 if (ip->i_d.di_flushiter == DI_MAX_FLUSH)
3507 ip->i_d.di_flushiter = 0;
3508
3509 xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK);
3510 if (XFS_IFORK_Q(ip))
3511 xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK);
3512 xfs_inobp_check(mp, bp);
3513
3514 /*
3515 * We've recorded everything logged in the inode, so we'd like to clear
3516 * the ili_fields bits so we don't log and flush things unnecessarily.
3517 * However, we can't stop logging all this information until the data
3518 * we've copied into the disk buffer is written to disk. If we did we
3519 * might overwrite the copy of the inode in the log with all the data
3520 * after re-logging only part of it, and in the face of a crash we
3521 * wouldn't have all the data we need to recover.
3522 *
3523 * What we do is move the bits to the ili_last_fields field. When
3524 * logging the inode, these bits are moved back to the ili_fields field.
3525 * In the xfs_iflush_done() routine we clear ili_last_fields, since we
3526 * know that the information those bits represent is permanently on
3527 * disk. As long as the flush completes before the inode is logged
3528 * again, then both ili_fields and ili_last_fields will be cleared.
3529 *
3530 * We can play with the ili_fields bits here, because the inode lock
3531 * must be held exclusively in order to set bits there and the flush
3532 * lock protects the ili_last_fields bits. Set ili_logged so the flush
3533 * done routine can tell whether or not to look in the AIL. Also, store
3534 * the current LSN of the inode so that we can tell whether the item has
3535 * moved in the AIL from xfs_iflush_done(). In order to read the lsn we
3536 * need the AIL lock, because it is a 64 bit value that cannot be read
3537 * atomically.
3538 */
3539 iip->ili_last_fields = iip->ili_fields;
3540 iip->ili_fields = 0;
3541 iip->ili_fsync_fields = 0;
3542 iip->ili_logged = 1;
3543
3544 xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
3545 &iip->ili_item.li_lsn);
3546
3547 /*
3548 * Attach the function xfs_iflush_done to the inode's
3549 * buffer. This will remove the inode from the AIL
3550 * and unlock the inode's flush lock when the inode is
3551 * completely written to disk.
3552 */
3553 xfs_buf_attach_iodone(bp, xfs_iflush_done, &iip->ili_item);
3554
3555 /* generate the checksum. */
3556 xfs_dinode_calc_crc(mp, dip);
3557
3558 ASSERT(bp->b_fspriv != NULL);
3559 ASSERT(bp->b_iodone != NULL);
3560 return 0;
3561
3562corrupt_out:
3563 return -EFSCORRUPTED;
3564}