2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
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.
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.
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
18 #include <linux/log2.h>
22 #include "xfs_shared.h"
23 #include "xfs_format.h"
24 #include "xfs_log_format.h"
25 #include "xfs_trans_resv.h"
27 #include "xfs_mount.h"
28 #include "xfs_inode.h"
29 #include "xfs_da_format.h"
30 #include "xfs_da_btree.h"
32 #include "xfs_attr_sf.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"
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"
50 #include "xfs_bmap_btree.h"
52 kmem_zone_t
*xfs_inode_zone
;
55 * Used in xfs_itruncate_extents(). This is the maximum number of extents
56 * freed from a file in a single transaction.
58 #define XFS_ITRUNC_MAX_EXTENTS 2
60 STATIC
int xfs_iflush_int(struct xfs_inode
*, struct xfs_buf
*);
61 STATIC
int xfs_iunlink(struct xfs_trans
*, struct xfs_inode
*);
62 STATIC
int xfs_iunlink_remove(struct xfs_trans
*, struct xfs_inode
*);
65 * helper function to extract extent size hint from inode
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
;
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
90 * The functions return a value which should be given to the corresponding
94 xfs_ilock_data_map_shared(
97 uint lock_mode
= XFS_ILOCK_SHARED
;
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
);
107 xfs_ilock_attr_map_shared(
108 struct xfs_inode
*ip
)
110 uint lock_mode
= XFS_ILOCK_SHARED
;
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
);
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
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.
127 * Basic locking order:
129 * i_iolock -> i_mmap_lock -> page_lock -> i_ilock
131 * mmap_sem locking order:
133 * i_iolock -> page lock -> mmap_sem
134 * mmap_sem -> i_mmap_lock -> page_lock
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.
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
154 trace_xfs_ilock(ip
, lock_flags
, _RET_IP_
);
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.
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);
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
));
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
));
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
));
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.
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
202 trace_xfs_ilock_nowait(ip
, lock_flags
, _RET_IP_
);
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.
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);
217 if (lock_flags
& XFS_IOLOCK_EXCL
) {
218 if (!mrtryupdate(&ip
->i_iolock
))
220 } else if (lock_flags
& XFS_IOLOCK_SHARED
) {
221 if (!mrtryaccess(&ip
->i_iolock
))
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
;
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
;
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
);
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
);
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.
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.
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.
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);
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
);
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
);
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
);
302 trace_xfs_iunlock(ip
, lock_flags
, _RET_IP_
);
306 * give up write locks. the i/o lock cannot be held nested
307 * if it is being demoted.
314 ASSERT(lock_flags
& (XFS_IOLOCK_EXCL
|XFS_MMAPLOCK_EXCL
|XFS_ILOCK_EXCL
));
316 ~(XFS_IOLOCK_EXCL
|XFS_MMAPLOCK_EXCL
|XFS_ILOCK_EXCL
)) == 0);
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
);
325 trace_xfs_ilock_demote(ip
, lock_flags
, _RET_IP_
);
328 #if defined(DEBUG) || defined(XFS_WARN)
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
);
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
);
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
);
359 int xfs_small_retries
;
360 int xfs_middle_retries
;
361 int xfs_lots_retries
;
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.
371 #if (defined(DEBUG) || defined(XFS_WARN)) && defined(CONFIG_LOCKDEP)
373 xfs_lockdep_subclass_ok(
376 return subclass
< MAX_LOCKDEP_SUBCLASSES
;
379 #define xfs_lockdep_subclass_ok(subclass) (true)
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.
389 xfs_lock_inumorder(int lock_mode
, int subclass
)
393 ASSERT(!(lock_mode
& (XFS_ILOCK_PARENT
| XFS_ILOCK_RTBITMAP
|
395 ASSERT(xfs_lockdep_subclass_ok(subclass
));
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
;
406 if (lock_mode
& (XFS_MMAPLOCK_SHARED
|XFS_MMAPLOCK_EXCL
)) {
407 ASSERT(subclass
<= XFS_MMAPLOCK_MAX_SUBCLASS
);
408 class += subclass
<< XFS_MMAPLOCK_SHIFT
;
411 if (lock_mode
& (XFS_ILOCK_SHARED
|XFS_ILOCK_EXCL
)) {
412 ASSERT(subclass
<= XFS_ILOCK_MAX_SUBCLASS
);
413 class += subclass
<< XFS_ILOCK_SHIFT
;
416 return (lock_mode
& ~XFS_LOCK_SUBCLASS_MASK
) | class;
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.
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.
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.
440 int attempts
= 0, i
, j
, try_lock
;
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
450 ASSERT(ips
&& inodes
>= 2 && inodes
<= 5);
451 ASSERT(lock_mode
& (XFS_IOLOCK_EXCL
| XFS_MMAPLOCK_EXCL
|
453 ASSERT(!(lock_mode
& (XFS_IOLOCK_SHARED
| XFS_MMAPLOCK_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);
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
));
470 for (; i
< inodes
; i
++) {
473 if (i
&& (ips
[i
] == ips
[i
- 1])) /* Already locked */
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.
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
))
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
495 xfs_ilock(ips
[i
], xfs_lock_inumorder(lock_mode
, i
));
499 /* try_lock means we have an inode locked that is in the AIL. */
501 if (xfs_ilock_nowait(ips
[i
], xfs_lock_inumorder(lock_mode
, i
)))
505 * Unlock all previous guys and try again. xfs_iunlock will try
506 * to push the tail if the inode is in the AIL.
509 for (j
= i
- 1; j
>= 0; j
--) {
511 * Check to see if we've already unlocked this one. Not
512 * the first one going back, and the inode ptr is the
515 if (j
!= (i
- 1) && ips
[j
] == ips
[j
+ 1])
518 xfs_iunlock(ips
[j
], lock_mode
);
521 if ((attempts
% 5) == 0) {
522 delay(1); /* Don't just spin the CPU */
534 if (attempts
< 5) xfs_small_retries
++;
535 else if (attempts
< 100) xfs_middle_retries
++;
536 else xfs_lots_retries
++;
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.
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
)));
565 ASSERT(ip0
->i_ino
!= ip1
->i_ino
);
567 if (ip0
->i_ino
> ip1
->i_ino
) {
574 xfs_ilock(ip0
, xfs_lock_inumorder(lock_mode
, 0));
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
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 */
590 xfs_ilock(ip1
, xfs_lock_inumorder(lock_mode
, 1));
597 struct xfs_inode
*ip
)
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
);
603 prepare_to_wait_exclusive(wq
, &wait
.wait
, TASK_UNINTERRUPTIBLE
);
604 if (xfs_isiflocked(ip
))
606 } while (!xfs_iflock_nowait(ip
));
608 finish_wait(wq
, &wait
.wait
);
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
;
650 if (di_flags2
& XFS_DIFLAG2_ANY
) {
651 if (di_flags2
& XFS_DIFLAG2_DAX
)
652 flags
|= FS_XFLAG_DAX
;
656 flags
|= FS_XFLAG_HASATTR
;
663 struct xfs_inode
*ip
)
665 struct xfs_icdinode
*dic
= &ip
->i_d
;
667 return _xfs_dic2xflags(dic
->di_flags
, dic
->di_flags2
, XFS_IFORK_Q(ip
));
671 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
672 * is allowed, otherwise it has to be an exact match. If a CI match is found,
673 * ci_name->name will point to a the actual name (caller must free) or
674 * will be set to NULL if an exact match is found.
679 struct xfs_name
*name
,
681 struct xfs_name
*ci_name
)
686 trace_xfs_lookup(dp
, name
);
688 if (XFS_FORCED_SHUTDOWN(dp
->i_mount
))
691 xfs_ilock(dp
, XFS_IOLOCK_SHARED
);
692 error
= xfs_dir_lookup(NULL
, dp
, name
, &inum
, ci_name
);
696 error
= xfs_iget(dp
->i_mount
, NULL
, inum
, 0, 0, ipp
);
700 xfs_iunlock(dp
, XFS_IOLOCK_SHARED
);
705 kmem_free(ci_name
->name
);
707 xfs_iunlock(dp
, XFS_IOLOCK_SHARED
);
713 * Allocate an inode on disk and return a copy of its in-core version.
714 * The in-core inode is locked exclusively. Set mode, nlink, and rdev
715 * appropriately within the inode. The uid and gid for the inode are
716 * set according to the contents of the given cred structure.
718 * Use xfs_dialloc() to allocate the on-disk inode. If xfs_dialloc()
719 * has a free inode available, call xfs_iget() to obtain the in-core
720 * version of the allocated inode. Finally, fill in the inode and
721 * log its initial contents. In this case, ialloc_context would be
724 * If xfs_dialloc() does not have an available inode, it will replenish
725 * its supply by doing an allocation. Since we can only do one
726 * allocation within a transaction without deadlocks, we must commit
727 * the current transaction before returning the inode itself.
728 * In this case, therefore, we will set ialloc_context and return.
729 * The caller should then commit the current transaction, start a new
730 * transaction, and call xfs_ialloc() again to actually get the inode.
732 * To ensure that some other process does not grab the inode that
733 * was allocated during the first call to xfs_ialloc(), this routine
734 * also returns the [locked] bp pointing to the head of the freelist
735 * as ialloc_context. The caller should hold this buffer across
736 * the commit and pass it back into this routine on the second call.
738 * If we are allocating quota inodes, we do not have a parent inode
739 * to attach to or associate with (i.e. pip == NULL) because they
740 * are not linked into the directory structure - they are attached
741 * directly to the superblock - and so have no parent.
752 xfs_buf_t
**ialloc_context
,
755 struct xfs_mount
*mp
= tp
->t_mountp
;
764 * Call the space management code to pick
765 * the on-disk inode to be allocated.
767 error
= xfs_dialloc(tp
, pip
? pip
->i_ino
: 0, mode
, okalloc
,
768 ialloc_context
, &ino
);
771 if (*ialloc_context
|| ino
== NULLFSINO
) {
775 ASSERT(*ialloc_context
== NULL
);
778 * Get the in-core inode with the lock held exclusively.
779 * This is because we're setting fields here we need
780 * to prevent others from looking at until we're done.
782 error
= xfs_iget(mp
, tp
, ino
, XFS_IGET_CREATE
,
783 XFS_ILOCK_EXCL
, &ip
);
790 * We always convert v1 inodes to v2 now - we only support filesystems
791 * with >= v2 inode capability, so there is no reason for ever leaving
792 * an inode in v1 format.
794 if (ip
->i_d
.di_version
== 1)
795 ip
->i_d
.di_version
= 2;
797 inode
->i_mode
= mode
;
798 set_nlink(inode
, nlink
);
799 ip
->i_d
.di_uid
= xfs_kuid_to_uid(current_fsuid());
800 ip
->i_d
.di_gid
= xfs_kgid_to_gid(current_fsgid());
801 xfs_set_projid(ip
, prid
);
803 if (pip
&& XFS_INHERIT_GID(pip
)) {
804 ip
->i_d
.di_gid
= pip
->i_d
.di_gid
;
805 if ((VFS_I(pip
)->i_mode
& S_ISGID
) && S_ISDIR(mode
))
806 inode
->i_mode
|= S_ISGID
;
810 * If the group ID of the new file does not match the effective group
811 * ID or one of the supplementary group IDs, the S_ISGID bit is cleared
812 * (and only if the irix_sgid_inherit compatibility variable is set).
814 if ((irix_sgid_inherit
) &&
815 (inode
->i_mode
& S_ISGID
) &&
816 (!in_group_p(xfs_gid_to_kgid(ip
->i_d
.di_gid
))))
817 inode
->i_mode
&= ~S_ISGID
;
820 ip
->i_d
.di_nextents
= 0;
821 ASSERT(ip
->i_d
.di_nblocks
== 0);
823 tv
= current_fs_time(mp
->m_super
);
828 ip
->i_d
.di_extsize
= 0;
829 ip
->i_d
.di_dmevmask
= 0;
830 ip
->i_d
.di_dmstate
= 0;
831 ip
->i_d
.di_flags
= 0;
833 if (ip
->i_d
.di_version
== 3) {
834 inode
->i_version
= 1;
835 ip
->i_d
.di_flags2
= 0;
836 ip
->i_d
.di_crtime
.t_sec
= (__int32_t
)tv
.tv_sec
;
837 ip
->i_d
.di_crtime
.t_nsec
= (__int32_t
)tv
.tv_nsec
;
841 flags
= XFS_ILOG_CORE
;
842 switch (mode
& S_IFMT
) {
847 ip
->i_d
.di_format
= XFS_DINODE_FMT_DEV
;
848 ip
->i_df
.if_u2
.if_rdev
= rdev
;
849 ip
->i_df
.if_flags
= 0;
850 flags
|= XFS_ILOG_DEV
;
854 if (pip
&& (pip
->i_d
.di_flags
& XFS_DIFLAG_ANY
)) {
855 uint64_t di_flags2
= 0;
859 if (pip
->i_d
.di_flags
& XFS_DIFLAG_RTINHERIT
)
860 di_flags
|= XFS_DIFLAG_RTINHERIT
;
861 if (pip
->i_d
.di_flags
& XFS_DIFLAG_EXTSZINHERIT
) {
862 di_flags
|= XFS_DIFLAG_EXTSZINHERIT
;
863 ip
->i_d
.di_extsize
= pip
->i_d
.di_extsize
;
865 if (pip
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
)
866 di_flags
|= XFS_DIFLAG_PROJINHERIT
;
867 } else if (S_ISREG(mode
)) {
868 if (pip
->i_d
.di_flags
& XFS_DIFLAG_RTINHERIT
)
869 di_flags
|= XFS_DIFLAG_REALTIME
;
870 if (pip
->i_d
.di_flags
& XFS_DIFLAG_EXTSZINHERIT
) {
871 di_flags
|= XFS_DIFLAG_EXTSIZE
;
872 ip
->i_d
.di_extsize
= pip
->i_d
.di_extsize
;
875 if ((pip
->i_d
.di_flags
& XFS_DIFLAG_NOATIME
) &&
877 di_flags
|= XFS_DIFLAG_NOATIME
;
878 if ((pip
->i_d
.di_flags
& XFS_DIFLAG_NODUMP
) &&
880 di_flags
|= XFS_DIFLAG_NODUMP
;
881 if ((pip
->i_d
.di_flags
& XFS_DIFLAG_SYNC
) &&
883 di_flags
|= XFS_DIFLAG_SYNC
;
884 if ((pip
->i_d
.di_flags
& XFS_DIFLAG_NOSYMLINKS
) &&
885 xfs_inherit_nosymlinks
)
886 di_flags
|= XFS_DIFLAG_NOSYMLINKS
;
887 if ((pip
->i_d
.di_flags
& XFS_DIFLAG_NODEFRAG
) &&
888 xfs_inherit_nodefrag
)
889 di_flags
|= XFS_DIFLAG_NODEFRAG
;
890 if (pip
->i_d
.di_flags
& XFS_DIFLAG_FILESTREAM
)
891 di_flags
|= XFS_DIFLAG_FILESTREAM
;
892 if (pip
->i_d
.di_flags2
& XFS_DIFLAG2_DAX
)
893 di_flags2
|= XFS_DIFLAG2_DAX
;
895 ip
->i_d
.di_flags
|= di_flags
;
896 ip
->i_d
.di_flags2
|= di_flags2
;
900 ip
->i_d
.di_format
= XFS_DINODE_FMT_EXTENTS
;
901 ip
->i_df
.if_flags
= XFS_IFEXTENTS
;
902 ip
->i_df
.if_bytes
= ip
->i_df
.if_real_bytes
= 0;
903 ip
->i_df
.if_u1
.if_extents
= NULL
;
909 * Attribute fork settings for new inode.
911 ip
->i_d
.di_aformat
= XFS_DINODE_FMT_EXTENTS
;
912 ip
->i_d
.di_anextents
= 0;
915 * Log the new values stuffed into the inode.
917 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
918 xfs_trans_log_inode(tp
, ip
, flags
);
920 /* now that we have an i_mode we can setup the inode structure */
928 * Allocates a new inode from disk and return a pointer to the
929 * incore copy. This routine will internally commit the current
930 * transaction and allocate a new one if the Space Manager needed
931 * to do an allocation to replenish the inode free-list.
933 * This routine is designed to be called from xfs_create and
939 xfs_trans_t
**tpp
, /* input: current transaction;
940 output: may be a new transaction. */
941 xfs_inode_t
*dp
, /* directory within whose allocate
946 prid_t prid
, /* project id */
947 int okalloc
, /* ok to allocate new space */
948 xfs_inode_t
**ipp
, /* pointer to inode; it will be
955 xfs_buf_t
*ialloc_context
= NULL
;
961 ASSERT(tp
->t_flags
& XFS_TRANS_PERM_LOG_RES
);
964 * xfs_ialloc will return a pointer to an incore inode if
965 * the Space Manager has an available inode on the free
966 * list. Otherwise, it will do an allocation and replenish
967 * the freelist. Since we can only do one allocation per
968 * transaction without deadlocks, we will need to commit the
969 * current transaction and start a new one. We will then
970 * need to call xfs_ialloc again to get the inode.
972 * If xfs_ialloc did an allocation to replenish the freelist,
973 * it returns the bp containing the head of the freelist as
974 * ialloc_context. We will hold a lock on it across the
975 * transaction commit so that no other process can steal
976 * the inode(s) that we've just allocated.
978 code
= xfs_ialloc(tp
, dp
, mode
, nlink
, rdev
, prid
, okalloc
,
979 &ialloc_context
, &ip
);
982 * Return an error if we were unable to allocate a new inode.
983 * This should only happen if we run out of space on disk or
984 * encounter a disk error.
990 if (!ialloc_context
&& !ip
) {
996 * If the AGI buffer is non-NULL, then we were unable to get an
997 * inode in one operation. We need to commit the current
998 * transaction and call xfs_ialloc() again. It is guaranteed
999 * to succeed the second time.
1001 if (ialloc_context
) {
1003 * Normally, xfs_trans_commit releases all the locks.
1004 * We call bhold to hang on to the ialloc_context across
1005 * the commit. Holding this buffer prevents any other
1006 * processes from doing any allocations in this
1009 xfs_trans_bhold(tp
, ialloc_context
);
1012 * We want the quota changes to be associated with the next
1013 * transaction, NOT this one. So, detach the dqinfo from this
1014 * and attach it to the next transaction.
1019 dqinfo
= (void *)tp
->t_dqinfo
;
1020 tp
->t_dqinfo
= NULL
;
1021 tflags
= tp
->t_flags
& XFS_TRANS_DQ_DIRTY
;
1022 tp
->t_flags
&= ~(XFS_TRANS_DQ_DIRTY
);
1025 code
= xfs_trans_roll(&tp
, NULL
);
1026 if (committed
!= NULL
)
1030 * Re-attach the quota info that we detached from prev trx.
1033 tp
->t_dqinfo
= dqinfo
;
1034 tp
->t_flags
|= tflags
;
1038 xfs_buf_relse(ialloc_context
);
1043 xfs_trans_bjoin(tp
, ialloc_context
);
1046 * Call ialloc again. Since we've locked out all
1047 * other allocations in this allocation group,
1048 * this call should always succeed.
1050 code
= xfs_ialloc(tp
, dp
, mode
, nlink
, rdev
, prid
,
1051 okalloc
, &ialloc_context
, &ip
);
1054 * If we get an error at this point, return to the caller
1055 * so that the current transaction can be aborted.
1062 ASSERT(!ialloc_context
&& ip
);
1065 if (committed
!= NULL
)
1076 * Decrement the link count on an inode & log the change. If this causes the
1077 * link count to go to zero, move the inode to AGI unlinked list so that it can
1078 * be freed when the last active reference goes away via xfs_inactive().
1080 static int /* error */
1085 xfs_trans_ichgtime(tp
, ip
, XFS_ICHGTIME_CHG
);
1087 drop_nlink(VFS_I(ip
));
1088 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
1090 if (VFS_I(ip
)->i_nlink
)
1093 return xfs_iunlink(tp
, ip
);
1097 * Increment the link count on an inode & log the change.
1104 xfs_trans_ichgtime(tp
, ip
, XFS_ICHGTIME_CHG
);
1106 ASSERT(ip
->i_d
.di_version
> 1);
1107 inc_nlink(VFS_I(ip
));
1108 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
1115 struct xfs_name
*name
,
1120 int is_dir
= S_ISDIR(mode
);
1121 struct xfs_mount
*mp
= dp
->i_mount
;
1122 struct xfs_inode
*ip
= NULL
;
1123 struct xfs_trans
*tp
= NULL
;
1125 xfs_bmap_free_t free_list
;
1126 xfs_fsblock_t first_block
;
1127 bool unlock_dp_on_error
= false;
1129 struct xfs_dquot
*udqp
= NULL
;
1130 struct xfs_dquot
*gdqp
= NULL
;
1131 struct xfs_dquot
*pdqp
= NULL
;
1132 struct xfs_trans_res
*tres
;
1135 trace_xfs_create(dp
, name
);
1137 if (XFS_FORCED_SHUTDOWN(mp
))
1140 prid
= xfs_get_initial_prid(dp
);
1143 * Make sure that we have allocated dquot(s) on disk.
1145 error
= xfs_qm_vop_dqalloc(dp
, xfs_kuid_to_uid(current_fsuid()),
1146 xfs_kgid_to_gid(current_fsgid()), prid
,
1147 XFS_QMOPT_QUOTALL
| XFS_QMOPT_INHERIT
,
1148 &udqp
, &gdqp
, &pdqp
);
1154 resblks
= XFS_MKDIR_SPACE_RES(mp
, name
->len
);
1155 tres
= &M_RES(mp
)->tr_mkdir
;
1157 resblks
= XFS_CREATE_SPACE_RES(mp
, name
->len
);
1158 tres
= &M_RES(mp
)->tr_create
;
1162 * Initially assume that the file does not exist and
1163 * reserve the resources for that case. If that is not
1164 * the case we'll drop the one we have and get a more
1165 * appropriate transaction later.
1167 error
= xfs_trans_alloc(mp
, tres
, resblks
, 0, 0, &tp
);
1168 if (error
== -ENOSPC
) {
1169 /* flush outstanding delalloc blocks and retry */
1170 xfs_flush_inodes(mp
);
1171 error
= xfs_trans_alloc(mp
, tres
, resblks
, 0, 0, &tp
);
1173 if (error
== -ENOSPC
) {
1174 /* No space at all so try a "no-allocation" reservation */
1176 error
= xfs_trans_alloc(mp
, tres
, 0, 0, 0, &tp
);
1179 goto out_release_inode
;
1181 xfs_ilock(dp
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
|
1182 XFS_IOLOCK_PARENT
| XFS_ILOCK_PARENT
);
1183 unlock_dp_on_error
= true;
1185 xfs_bmap_init(&free_list
, &first_block
);
1188 * Reserve disk quota and the inode.
1190 error
= xfs_trans_reserve_quota(tp
, mp
, udqp
, gdqp
,
1191 pdqp
, resblks
, 1, 0);
1193 goto out_trans_cancel
;
1196 error
= xfs_dir_canenter(tp
, dp
, name
);
1198 goto out_trans_cancel
;
1202 * A newly created regular or special file just has one directory
1203 * entry pointing to them, but a directory also the "." entry
1204 * pointing to itself.
1206 error
= xfs_dir_ialloc(&tp
, dp
, mode
, is_dir
? 2 : 1, rdev
,
1207 prid
, resblks
> 0, &ip
, NULL
);
1209 goto out_trans_cancel
;
1212 * Now we join the directory inode to the transaction. We do not do it
1213 * earlier because xfs_dir_ialloc might commit the previous transaction
1214 * (and release all the locks). An error from here on will result in
1215 * the transaction cancel unlocking dp so don't do it explicitly in the
1218 xfs_trans_ijoin(tp
, dp
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
1219 unlock_dp_on_error
= false;
1221 error
= xfs_dir_createname(tp
, dp
, name
, ip
->i_ino
,
1222 &first_block
, &free_list
, resblks
?
1223 resblks
- XFS_IALLOC_SPACE_RES(mp
) : 0);
1225 ASSERT(error
!= -ENOSPC
);
1226 goto out_trans_cancel
;
1228 xfs_trans_ichgtime(tp
, dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
1229 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);
1232 error
= xfs_dir_init(tp
, ip
, dp
);
1234 goto out_bmap_cancel
;
1236 error
= xfs_bumplink(tp
, dp
);
1238 goto out_bmap_cancel
;
1242 * If this is a synchronous mount, make sure that the
1243 * create transaction goes to disk before returning to
1246 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
))
1247 xfs_trans_set_sync(tp
);
1250 * Attach the dquot(s) to the inodes and modify them incore.
1251 * These ids of the inode couldn't have changed since the new
1252 * inode has been locked ever since it was created.
1254 xfs_qm_vop_create_dqattach(tp
, ip
, udqp
, gdqp
, pdqp
);
1256 error
= xfs_bmap_finish(&tp
, &free_list
, NULL
);
1258 goto out_bmap_cancel
;
1260 error
= xfs_trans_commit(tp
);
1262 goto out_release_inode
;
1264 xfs_qm_dqrele(udqp
);
1265 xfs_qm_dqrele(gdqp
);
1266 xfs_qm_dqrele(pdqp
);
1272 xfs_bmap_cancel(&free_list
);
1274 xfs_trans_cancel(tp
);
1277 * Wait until after the current transaction is aborted to finish the
1278 * setup of the inode and release the inode. This prevents recursive
1279 * transactions and deadlocks from xfs_inactive.
1282 xfs_finish_inode_setup(ip
);
1286 xfs_qm_dqrele(udqp
);
1287 xfs_qm_dqrele(gdqp
);
1288 xfs_qm_dqrele(pdqp
);
1290 if (unlock_dp_on_error
)
1291 xfs_iunlock(dp
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
1297 struct xfs_inode
*dp
,
1298 struct dentry
*dentry
,
1300 struct xfs_inode
**ipp
)
1302 struct xfs_mount
*mp
= dp
->i_mount
;
1303 struct xfs_inode
*ip
= NULL
;
1304 struct xfs_trans
*tp
= NULL
;
1307 struct xfs_dquot
*udqp
= NULL
;
1308 struct xfs_dquot
*gdqp
= NULL
;
1309 struct xfs_dquot
*pdqp
= NULL
;
1310 struct xfs_trans_res
*tres
;
1313 if (XFS_FORCED_SHUTDOWN(mp
))
1316 prid
= xfs_get_initial_prid(dp
);
1319 * Make sure that we have allocated dquot(s) on disk.
1321 error
= xfs_qm_vop_dqalloc(dp
, xfs_kuid_to_uid(current_fsuid()),
1322 xfs_kgid_to_gid(current_fsgid()), prid
,
1323 XFS_QMOPT_QUOTALL
| XFS_QMOPT_INHERIT
,
1324 &udqp
, &gdqp
, &pdqp
);
1328 resblks
= XFS_IALLOC_SPACE_RES(mp
);
1329 tres
= &M_RES(mp
)->tr_create_tmpfile
;
1331 error
= xfs_trans_alloc(mp
, tres
, resblks
, 0, 0, &tp
);
1332 if (error
== -ENOSPC
) {
1333 /* No space at all so try a "no-allocation" reservation */
1335 error
= xfs_trans_alloc(mp
, tres
, 0, 0, 0, &tp
);
1338 goto out_release_inode
;
1340 error
= xfs_trans_reserve_quota(tp
, mp
, udqp
, gdqp
,
1341 pdqp
, resblks
, 1, 0);
1343 goto out_trans_cancel
;
1345 error
= xfs_dir_ialloc(&tp
, dp
, mode
, 1, 0,
1346 prid
, resblks
> 0, &ip
, NULL
);
1348 goto out_trans_cancel
;
1350 if (mp
->m_flags
& XFS_MOUNT_WSYNC
)
1351 xfs_trans_set_sync(tp
);
1354 * Attach the dquot(s) to the inodes and modify them incore.
1355 * These ids of the inode couldn't have changed since the new
1356 * inode has been locked ever since it was created.
1358 xfs_qm_vop_create_dqattach(tp
, ip
, udqp
, gdqp
, pdqp
);
1360 error
= xfs_iunlink(tp
, ip
);
1362 goto out_trans_cancel
;
1364 error
= xfs_trans_commit(tp
);
1366 goto out_release_inode
;
1368 xfs_qm_dqrele(udqp
);
1369 xfs_qm_dqrele(gdqp
);
1370 xfs_qm_dqrele(pdqp
);
1376 xfs_trans_cancel(tp
);
1379 * Wait until after the current transaction is aborted to finish the
1380 * setup of the inode and release the inode. This prevents recursive
1381 * transactions and deadlocks from xfs_inactive.
1384 xfs_finish_inode_setup(ip
);
1388 xfs_qm_dqrele(udqp
);
1389 xfs_qm_dqrele(gdqp
);
1390 xfs_qm_dqrele(pdqp
);
1399 struct xfs_name
*target_name
)
1401 xfs_mount_t
*mp
= tdp
->i_mount
;
1404 xfs_bmap_free_t free_list
;
1405 xfs_fsblock_t first_block
;
1408 trace_xfs_link(tdp
, target_name
);
1410 ASSERT(!S_ISDIR(VFS_I(sip
)->i_mode
));
1412 if (XFS_FORCED_SHUTDOWN(mp
))
1415 error
= xfs_qm_dqattach(sip
, 0);
1419 error
= xfs_qm_dqattach(tdp
, 0);
1423 resblks
= XFS_LINK_SPACE_RES(mp
, target_name
->len
);
1424 error
= xfs_trans_alloc(mp
, &M_RES(mp
)->tr_link
, resblks
, 0, 0, &tp
);
1425 if (error
== -ENOSPC
) {
1427 error
= xfs_trans_alloc(mp
, &M_RES(mp
)->tr_link
, 0, 0, 0, &tp
);
1432 xfs_ilock(tdp
, XFS_IOLOCK_EXCL
| XFS_IOLOCK_PARENT
);
1433 xfs_lock_two_inodes(sip
, tdp
, XFS_ILOCK_EXCL
);
1435 xfs_trans_ijoin(tp
, sip
, XFS_ILOCK_EXCL
);
1436 xfs_trans_ijoin(tp
, tdp
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
1439 * If we are using project inheritance, we only allow hard link
1440 * creation in our tree when the project IDs are the same; else
1441 * the tree quota mechanism could be circumvented.
1443 if (unlikely((tdp
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
) &&
1444 (xfs_get_projid(tdp
) != xfs_get_projid(sip
)))) {
1450 error
= xfs_dir_canenter(tp
, tdp
, target_name
);
1455 xfs_bmap_init(&free_list
, &first_block
);
1458 * Handle initial link state of O_TMPFILE inode
1460 if (VFS_I(sip
)->i_nlink
== 0) {
1461 error
= xfs_iunlink_remove(tp
, sip
);
1466 error
= xfs_dir_createname(tp
, tdp
, target_name
, sip
->i_ino
,
1467 &first_block
, &free_list
, resblks
);
1470 xfs_trans_ichgtime(tp
, tdp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
1471 xfs_trans_log_inode(tp
, tdp
, XFS_ILOG_CORE
);
1473 error
= xfs_bumplink(tp
, sip
);
1478 * If this is a synchronous mount, make sure that the
1479 * link transaction goes to disk before returning to
1482 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
))
1483 xfs_trans_set_sync(tp
);
1485 error
= xfs_bmap_finish(&tp
, &free_list
, NULL
);
1487 xfs_bmap_cancel(&free_list
);
1491 return xfs_trans_commit(tp
);
1494 xfs_trans_cancel(tp
);
1500 * Free up the underlying blocks past new_size. The new size must be smaller
1501 * than the current size. This routine can be used both for the attribute and
1502 * data fork, and does not modify the inode size, which is left to the caller.
1504 * The transaction passed to this routine must have made a permanent log
1505 * reservation of at least XFS_ITRUNCATE_LOG_RES. This routine may commit the
1506 * given transaction and start new ones, so make sure everything involved in
1507 * the transaction is tidy before calling here. Some transaction will be
1508 * returned to the caller to be committed. The incoming transaction must
1509 * already include the inode, and both inode locks must be held exclusively.
1510 * The inode must also be "held" within the transaction. On return the inode
1511 * will be "held" within the returned transaction. This routine does NOT
1512 * require any disk space to be reserved for it within the transaction.
1514 * If we get an error, we must return with the inode locked and linked into the
1515 * current transaction. This keeps things simple for the higher level code,
1516 * because it always knows that the inode is locked and held in the transaction
1517 * that returns to it whether errors occur or not. We don't mark the inode
1518 * dirty on error so that transactions can be easily aborted if possible.
1521 xfs_itruncate_extents(
1522 struct xfs_trans
**tpp
,
1523 struct xfs_inode
*ip
,
1525 xfs_fsize_t new_size
)
1527 struct xfs_mount
*mp
= ip
->i_mount
;
1528 struct xfs_trans
*tp
= *tpp
;
1529 xfs_bmap_free_t free_list
;
1530 xfs_fsblock_t first_block
;
1531 xfs_fileoff_t first_unmap_block
;
1532 xfs_fileoff_t last_block
;
1533 xfs_filblks_t unmap_len
;
1537 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
));
1538 ASSERT(!atomic_read(&VFS_I(ip
)->i_count
) ||
1539 xfs_isilocked(ip
, XFS_IOLOCK_EXCL
));
1540 ASSERT(new_size
<= XFS_ISIZE(ip
));
1541 ASSERT(tp
->t_flags
& XFS_TRANS_PERM_LOG_RES
);
1542 ASSERT(ip
->i_itemp
!= NULL
);
1543 ASSERT(ip
->i_itemp
->ili_lock_flags
== 0);
1544 ASSERT(!XFS_NOT_DQATTACHED(mp
, ip
));
1546 trace_xfs_itruncate_extents_start(ip
, new_size
);
1549 * Since it is possible for space to become allocated beyond
1550 * the end of the file (in a crash where the space is allocated
1551 * but the inode size is not yet updated), simply remove any
1552 * blocks which show up between the new EOF and the maximum
1553 * possible file size. If the first block to be removed is
1554 * beyond the maximum file size (ie it is the same as last_block),
1555 * then there is nothing to do.
1557 first_unmap_block
= XFS_B_TO_FSB(mp
, (xfs_ufsize_t
)new_size
);
1558 last_block
= XFS_B_TO_FSB(mp
, mp
->m_super
->s_maxbytes
);
1559 if (first_unmap_block
== last_block
)
1562 ASSERT(first_unmap_block
< last_block
);
1563 unmap_len
= last_block
- first_unmap_block
+ 1;
1565 xfs_bmap_init(&free_list
, &first_block
);
1566 error
= xfs_bunmapi(tp
, ip
,
1567 first_unmap_block
, unmap_len
,
1568 xfs_bmapi_aflag(whichfork
),
1569 XFS_ITRUNC_MAX_EXTENTS
,
1570 &first_block
, &free_list
,
1573 goto out_bmap_cancel
;
1576 * Duplicate the transaction that has the permanent
1577 * reservation and commit the old transaction.
1579 error
= xfs_bmap_finish(&tp
, &free_list
, ip
);
1581 goto out_bmap_cancel
;
1583 error
= xfs_trans_roll(&tp
, ip
);
1589 * Always re-log the inode so that our permanent transaction can keep
1590 * on rolling it forward in the log.
1592 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
1594 trace_xfs_itruncate_extents_end(ip
, new_size
);
1601 * If the bunmapi call encounters an error, return to the caller where
1602 * the transaction can be properly aborted. We just need to make sure
1603 * we're not holding any resources that we were not when we came in.
1605 xfs_bmap_cancel(&free_list
);
1613 xfs_mount_t
*mp
= ip
->i_mount
;
1616 if (!S_ISREG(VFS_I(ip
)->i_mode
) || (VFS_I(ip
)->i_mode
== 0))
1619 /* If this is a read-only mount, don't do this (would generate I/O) */
1620 if (mp
->m_flags
& XFS_MOUNT_RDONLY
)
1623 if (!XFS_FORCED_SHUTDOWN(mp
)) {
1627 * If we previously truncated this file and removed old data
1628 * in the process, we want to initiate "early" writeout on
1629 * the last close. This is an attempt to combat the notorious
1630 * NULL files problem which is particularly noticeable from a
1631 * truncate down, buffered (re-)write (delalloc), followed by
1632 * a crash. What we are effectively doing here is
1633 * significantly reducing the time window where we'd otherwise
1634 * be exposed to that problem.
1636 truncated
= xfs_iflags_test_and_clear(ip
, XFS_ITRUNCATED
);
1638 xfs_iflags_clear(ip
, XFS_IDIRTY_RELEASE
);
1639 if (ip
->i_delayed_blks
> 0) {
1640 error
= filemap_flush(VFS_I(ip
)->i_mapping
);
1647 if (VFS_I(ip
)->i_nlink
== 0)
1650 if (xfs_can_free_eofblocks(ip
, false)) {
1653 * If we can't get the iolock just skip truncating the blocks
1654 * past EOF because we could deadlock with the mmap_sem
1655 * otherwise. We'll get another chance to drop them once the
1656 * last reference to the inode is dropped, so we'll never leak
1657 * blocks permanently.
1659 * Further, check if the inode is being opened, written and
1660 * closed frequently and we have delayed allocation blocks
1661 * outstanding (e.g. streaming writes from the NFS server),
1662 * truncating the blocks past EOF will cause fragmentation to
1665 * In this case don't do the truncation, either, but we have to
1666 * be careful how we detect this case. Blocks beyond EOF show
1667 * up as i_delayed_blks even when the inode is clean, so we
1668 * need to truncate them away first before checking for a dirty
1669 * release. Hence on the first dirty close we will still remove
1670 * the speculative allocation, but after that we will leave it
1673 if (xfs_iflags_test(ip
, XFS_IDIRTY_RELEASE
))
1676 error
= xfs_free_eofblocks(mp
, ip
, true);
1677 if (error
&& error
!= -EAGAIN
)
1680 /* delalloc blocks after truncation means it really is dirty */
1681 if (ip
->i_delayed_blks
)
1682 xfs_iflags_set(ip
, XFS_IDIRTY_RELEASE
);
1688 * xfs_inactive_truncate
1690 * Called to perform a truncate when an inode becomes unlinked.
1693 xfs_inactive_truncate(
1694 struct xfs_inode
*ip
)
1696 struct xfs_mount
*mp
= ip
->i_mount
;
1697 struct xfs_trans
*tp
;
1700 error
= xfs_trans_alloc(mp
, &M_RES(mp
)->tr_itruncate
, 0, 0, 0, &tp
);
1702 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
1706 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1707 xfs_trans_ijoin(tp
, ip
, 0);
1710 * Log the inode size first to prevent stale data exposure in the event
1711 * of a system crash before the truncate completes. See the related
1712 * comment in xfs_setattr_size() for details.
1714 ip
->i_d
.di_size
= 0;
1715 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
1717 error
= xfs_itruncate_extents(&tp
, ip
, XFS_DATA_FORK
, 0);
1719 goto error_trans_cancel
;
1721 ASSERT(ip
->i_d
.di_nextents
== 0);
1723 error
= xfs_trans_commit(tp
);
1727 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1731 xfs_trans_cancel(tp
);
1733 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1738 * xfs_inactive_ifree()
1740 * Perform the inode free when an inode is unlinked.
1744 struct xfs_inode
*ip
)
1746 xfs_bmap_free_t free_list
;
1747 xfs_fsblock_t first_block
;
1748 struct xfs_mount
*mp
= ip
->i_mount
;
1749 struct xfs_trans
*tp
;
1753 * The ifree transaction might need to allocate blocks for record
1754 * insertion to the finobt. We don't want to fail here at ENOSPC, so
1755 * allow ifree to dip into the reserved block pool if necessary.
1757 * Freeing large sets of inodes generally means freeing inode chunks,
1758 * directory and file data blocks, so this should be relatively safe.
1759 * Only under severe circumstances should it be possible to free enough
1760 * inodes to exhaust the reserve block pool via finobt expansion while
1761 * at the same time not creating free space in the filesystem.
1763 * Send a warning if the reservation does happen to fail, as the inode
1764 * now remains allocated and sits on the unlinked list until the fs is
1767 error
= xfs_trans_alloc(mp
, &M_RES(mp
)->tr_ifree
,
1768 XFS_IFREE_SPACE_RES(mp
), 0, XFS_TRANS_RESERVE
, &tp
);
1770 if (error
== -ENOSPC
) {
1771 xfs_warn_ratelimited(mp
,
1772 "Failed to remove inode(s) from unlinked list. "
1773 "Please free space, unmount and run xfs_repair.");
1775 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
1780 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1781 xfs_trans_ijoin(tp
, ip
, 0);
1783 xfs_bmap_init(&free_list
, &first_block
);
1784 error
= xfs_ifree(tp
, ip
, &free_list
);
1787 * If we fail to free the inode, shut down. The cancel
1788 * might do that, we need to make sure. Otherwise the
1789 * inode might be lost for a long time or forever.
1791 if (!XFS_FORCED_SHUTDOWN(mp
)) {
1792 xfs_notice(mp
, "%s: xfs_ifree returned error %d",
1794 xfs_force_shutdown(mp
, SHUTDOWN_META_IO_ERROR
);
1796 xfs_trans_cancel(tp
);
1797 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1802 * Credit the quota account(s). The inode is gone.
1804 xfs_trans_mod_dquot_byino(tp
, ip
, XFS_TRANS_DQ_ICOUNT
, -1);
1807 * Just ignore errors at this point. There is nothing we can do except
1808 * to try to keep going. Make sure it's not a silent error.
1810 error
= xfs_bmap_finish(&tp
, &free_list
, NULL
);
1812 xfs_notice(mp
, "%s: xfs_bmap_finish returned error %d",
1814 xfs_bmap_cancel(&free_list
);
1816 error
= xfs_trans_commit(tp
);
1818 xfs_notice(mp
, "%s: xfs_trans_commit returned error %d",
1821 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1828 * This is called when the vnode reference count for the vnode
1829 * goes to zero. If the file has been unlinked, then it must
1830 * now be truncated. Also, we clear all of the read-ahead state
1831 * kept for the inode here since the file is now closed.
1837 struct xfs_mount
*mp
;
1842 * If the inode is already free, then there can be nothing
1845 if (VFS_I(ip
)->i_mode
== 0) {
1846 ASSERT(ip
->i_df
.if_real_bytes
== 0);
1847 ASSERT(ip
->i_df
.if_broot_bytes
== 0);
1853 /* If this is a read-only mount, don't do this (would generate I/O) */
1854 if (mp
->m_flags
& XFS_MOUNT_RDONLY
)
1857 if (VFS_I(ip
)->i_nlink
!= 0) {
1859 * force is true because we are evicting an inode from the
1860 * cache. Post-eof blocks must be freed, lest we end up with
1861 * broken free space accounting.
1863 if (xfs_can_free_eofblocks(ip
, true))
1864 xfs_free_eofblocks(mp
, ip
, false);
1869 if (S_ISREG(VFS_I(ip
)->i_mode
) &&
1870 (ip
->i_d
.di_size
!= 0 || XFS_ISIZE(ip
) != 0 ||
1871 ip
->i_d
.di_nextents
> 0 || ip
->i_delayed_blks
> 0))
1874 error
= xfs_qm_dqattach(ip
, 0);
1878 if (S_ISLNK(VFS_I(ip
)->i_mode
))
1879 error
= xfs_inactive_symlink(ip
);
1881 error
= xfs_inactive_truncate(ip
);
1886 * If there are attributes associated with the file then blow them away
1887 * now. The code calls a routine that recursively deconstructs the
1888 * attribute fork. If also blows away the in-core attribute fork.
1890 if (XFS_IFORK_Q(ip
)) {
1891 error
= xfs_attr_inactive(ip
);
1897 ASSERT(ip
->i_d
.di_anextents
== 0);
1898 ASSERT(ip
->i_d
.di_forkoff
== 0);
1903 error
= xfs_inactive_ifree(ip
);
1908 * Release the dquots held by inode, if any.
1910 xfs_qm_dqdetach(ip
);
1914 * This is called when the inode's link count goes to 0 or we are creating a
1915 * tmpfile via O_TMPFILE. In the case of a tmpfile, @ignore_linkcount will be
1916 * set to true as the link count is dropped to zero by the VFS after we've
1917 * created the file successfully, so we have to add it to the unlinked list
1918 * while the link count is non-zero.
1920 * We place the on-disk inode on a list in the AGI. It will be pulled from this
1921 * list when the inode is freed.
1925 struct xfs_trans
*tp
,
1926 struct xfs_inode
*ip
)
1928 xfs_mount_t
*mp
= tp
->t_mountp
;
1938 ASSERT(VFS_I(ip
)->i_mode
!= 0);
1941 * Get the agi buffer first. It ensures lock ordering
1944 error
= xfs_read_agi(mp
, tp
, XFS_INO_TO_AGNO(mp
, ip
->i_ino
), &agibp
);
1947 agi
= XFS_BUF_TO_AGI(agibp
);
1950 * Get the index into the agi hash table for the
1951 * list this inode will go on.
1953 agino
= XFS_INO_TO_AGINO(mp
, ip
->i_ino
);
1955 bucket_index
= agino
% XFS_AGI_UNLINKED_BUCKETS
;
1956 ASSERT(agi
->agi_unlinked
[bucket_index
]);
1957 ASSERT(be32_to_cpu(agi
->agi_unlinked
[bucket_index
]) != agino
);
1959 if (agi
->agi_unlinked
[bucket_index
] != cpu_to_be32(NULLAGINO
)) {
1961 * There is already another inode in the bucket we need
1962 * to add ourselves to. Add us at the front of the list.
1963 * Here we put the head pointer into our next pointer,
1964 * and then we fall through to point the head at us.
1966 error
= xfs_imap_to_bp(mp
, tp
, &ip
->i_imap
, &dip
, &ibp
,
1971 ASSERT(dip
->di_next_unlinked
== cpu_to_be32(NULLAGINO
));
1972 dip
->di_next_unlinked
= agi
->agi_unlinked
[bucket_index
];
1973 offset
= ip
->i_imap
.im_boffset
+
1974 offsetof(xfs_dinode_t
, di_next_unlinked
);
1976 /* need to recalc the inode CRC if appropriate */
1977 xfs_dinode_calc_crc(mp
, dip
);
1979 xfs_trans_inode_buf(tp
, ibp
);
1980 xfs_trans_log_buf(tp
, ibp
, offset
,
1981 (offset
+ sizeof(xfs_agino_t
) - 1));
1982 xfs_inobp_check(mp
, ibp
);
1986 * Point the bucket head pointer at the inode being inserted.
1989 agi
->agi_unlinked
[bucket_index
] = cpu_to_be32(agino
);
1990 offset
= offsetof(xfs_agi_t
, agi_unlinked
) +
1991 (sizeof(xfs_agino_t
) * bucket_index
);
1992 xfs_trans_buf_set_type(tp
, agibp
, XFS_BLFT_AGI_BUF
);
1993 xfs_trans_log_buf(tp
, agibp
, offset
,
1994 (offset
+ sizeof(xfs_agino_t
) - 1));
1999 * Pull the on-disk inode from the AGI unlinked list.
2012 xfs_agnumber_t agno
;
2014 xfs_agino_t next_agino
;
2015 xfs_buf_t
*last_ibp
;
2016 xfs_dinode_t
*last_dip
= NULL
;
2018 int offset
, last_offset
= 0;
2022 agno
= XFS_INO_TO_AGNO(mp
, ip
->i_ino
);
2025 * Get the agi buffer first. It ensures lock ordering
2028 error
= xfs_read_agi(mp
, tp
, agno
, &agibp
);
2032 agi
= XFS_BUF_TO_AGI(agibp
);
2035 * Get the index into the agi hash table for the
2036 * list this inode will go on.
2038 agino
= XFS_INO_TO_AGINO(mp
, ip
->i_ino
);
2040 bucket_index
= agino
% XFS_AGI_UNLINKED_BUCKETS
;
2041 ASSERT(agi
->agi_unlinked
[bucket_index
] != cpu_to_be32(NULLAGINO
));
2042 ASSERT(agi
->agi_unlinked
[bucket_index
]);
2044 if (be32_to_cpu(agi
->agi_unlinked
[bucket_index
]) == agino
) {
2046 * We're at the head of the list. Get the inode's on-disk
2047 * buffer to see if there is anyone after us on the list.
2048 * Only modify our next pointer if it is not already NULLAGINO.
2049 * This saves us the overhead of dealing with the buffer when
2050 * there is no need to change it.
2052 error
= xfs_imap_to_bp(mp
, tp
, &ip
->i_imap
, &dip
, &ibp
,
2055 xfs_warn(mp
, "%s: xfs_imap_to_bp returned error %d.",
2059 next_agino
= be32_to_cpu(dip
->di_next_unlinked
);
2060 ASSERT(next_agino
!= 0);
2061 if (next_agino
!= NULLAGINO
) {
2062 dip
->di_next_unlinked
= cpu_to_be32(NULLAGINO
);
2063 offset
= ip
->i_imap
.im_boffset
+
2064 offsetof(xfs_dinode_t
, di_next_unlinked
);
2066 /* need to recalc the inode CRC if appropriate */
2067 xfs_dinode_calc_crc(mp
, dip
);
2069 xfs_trans_inode_buf(tp
, ibp
);
2070 xfs_trans_log_buf(tp
, ibp
, offset
,
2071 (offset
+ sizeof(xfs_agino_t
) - 1));
2072 xfs_inobp_check(mp
, ibp
);
2074 xfs_trans_brelse(tp
, ibp
);
2077 * Point the bucket head pointer at the next inode.
2079 ASSERT(next_agino
!= 0);
2080 ASSERT(next_agino
!= agino
);
2081 agi
->agi_unlinked
[bucket_index
] = cpu_to_be32(next_agino
);
2082 offset
= offsetof(xfs_agi_t
, agi_unlinked
) +
2083 (sizeof(xfs_agino_t
) * bucket_index
);
2084 xfs_trans_buf_set_type(tp
, agibp
, XFS_BLFT_AGI_BUF
);
2085 xfs_trans_log_buf(tp
, agibp
, offset
,
2086 (offset
+ sizeof(xfs_agino_t
) - 1));
2089 * We need to search the list for the inode being freed.
2091 next_agino
= be32_to_cpu(agi
->agi_unlinked
[bucket_index
]);
2093 while (next_agino
!= agino
) {
2094 struct xfs_imap imap
;
2097 xfs_trans_brelse(tp
, last_ibp
);
2100 next_ino
= XFS_AGINO_TO_INO(mp
, agno
, next_agino
);
2102 error
= xfs_imap(mp
, tp
, next_ino
, &imap
, 0);
2105 "%s: xfs_imap returned error %d.",
2110 error
= xfs_imap_to_bp(mp
, tp
, &imap
, &last_dip
,
2114 "%s: xfs_imap_to_bp returned error %d.",
2119 last_offset
= imap
.im_boffset
;
2120 next_agino
= be32_to_cpu(last_dip
->di_next_unlinked
);
2121 ASSERT(next_agino
!= NULLAGINO
);
2122 ASSERT(next_agino
!= 0);
2126 * Now last_ibp points to the buffer previous to us on the
2127 * unlinked list. Pull us from the list.
2129 error
= xfs_imap_to_bp(mp
, tp
, &ip
->i_imap
, &dip
, &ibp
,
2132 xfs_warn(mp
, "%s: xfs_imap_to_bp(2) returned error %d.",
2136 next_agino
= be32_to_cpu(dip
->di_next_unlinked
);
2137 ASSERT(next_agino
!= 0);
2138 ASSERT(next_agino
!= agino
);
2139 if (next_agino
!= NULLAGINO
) {
2140 dip
->di_next_unlinked
= cpu_to_be32(NULLAGINO
);
2141 offset
= ip
->i_imap
.im_boffset
+
2142 offsetof(xfs_dinode_t
, di_next_unlinked
);
2144 /* need to recalc the inode CRC if appropriate */
2145 xfs_dinode_calc_crc(mp
, dip
);
2147 xfs_trans_inode_buf(tp
, ibp
);
2148 xfs_trans_log_buf(tp
, ibp
, offset
,
2149 (offset
+ sizeof(xfs_agino_t
) - 1));
2150 xfs_inobp_check(mp
, ibp
);
2152 xfs_trans_brelse(tp
, ibp
);
2155 * Point the previous inode on the list to the next inode.
2157 last_dip
->di_next_unlinked
= cpu_to_be32(next_agino
);
2158 ASSERT(next_agino
!= 0);
2159 offset
= last_offset
+ offsetof(xfs_dinode_t
, di_next_unlinked
);
2161 /* need to recalc the inode CRC if appropriate */
2162 xfs_dinode_calc_crc(mp
, last_dip
);
2164 xfs_trans_inode_buf(tp
, last_ibp
);
2165 xfs_trans_log_buf(tp
, last_ibp
, offset
,
2166 (offset
+ sizeof(xfs_agino_t
) - 1));
2167 xfs_inobp_check(mp
, last_ibp
);
2173 * A big issue when freeing the inode cluster is that we _cannot_ skip any
2174 * inodes that are in memory - they all must be marked stale and attached to
2175 * the cluster buffer.
2179 xfs_inode_t
*free_ip
,
2181 struct xfs_icluster
*xic
)
2183 xfs_mount_t
*mp
= free_ip
->i_mount
;
2184 int blks_per_cluster
;
2185 int inodes_per_cluster
;
2192 xfs_inode_log_item_t
*iip
;
2193 xfs_log_item_t
*lip
;
2194 struct xfs_perag
*pag
;
2197 inum
= xic
->first_ino
;
2198 pag
= xfs_perag_get(mp
, XFS_INO_TO_AGNO(mp
, inum
));
2199 blks_per_cluster
= xfs_icluster_size_fsb(mp
);
2200 inodes_per_cluster
= blks_per_cluster
<< mp
->m_sb
.sb_inopblog
;
2201 nbufs
= mp
->m_ialloc_blks
/ blks_per_cluster
;
2203 for (j
= 0; j
< nbufs
; j
++, inum
+= inodes_per_cluster
) {
2205 * The allocation bitmap tells us which inodes of the chunk were
2206 * physically allocated. Skip the cluster if an inode falls into
2209 ioffset
= inum
- xic
->first_ino
;
2210 if ((xic
->alloc
& XFS_INOBT_MASK(ioffset
)) == 0) {
2211 ASSERT(do_mod(ioffset
, inodes_per_cluster
) == 0);
2215 blkno
= XFS_AGB_TO_DADDR(mp
, XFS_INO_TO_AGNO(mp
, inum
),
2216 XFS_INO_TO_AGBNO(mp
, inum
));
2219 * We obtain and lock the backing buffer first in the process
2220 * here, as we have to ensure that any dirty inode that we
2221 * can't get the flush lock on is attached to the buffer.
2222 * If we scan the in-memory inodes first, then buffer IO can
2223 * complete before we get a lock on it, and hence we may fail
2224 * to mark all the active inodes on the buffer stale.
2226 bp
= xfs_trans_get_buf(tp
, mp
->m_ddev_targp
, blkno
,
2227 mp
->m_bsize
* blks_per_cluster
,
2234 * This buffer may not have been correctly initialised as we
2235 * didn't read it from disk. That's not important because we are
2236 * only using to mark the buffer as stale in the log, and to
2237 * attach stale cached inodes on it. That means it will never be
2238 * dispatched for IO. If it is, we want to know about it, and we
2239 * want it to fail. We can acheive this by adding a write
2240 * verifier to the buffer.
2242 bp
->b_ops
= &xfs_inode_buf_ops
;
2245 * Walk the inodes already attached to the buffer and mark them
2246 * stale. These will all have the flush locks held, so an
2247 * in-memory inode walk can't lock them. By marking them all
2248 * stale first, we will not attempt to lock them in the loop
2249 * below as the XFS_ISTALE flag will be set.
2253 if (lip
->li_type
== XFS_LI_INODE
) {
2254 iip
= (xfs_inode_log_item_t
*)lip
;
2255 ASSERT(iip
->ili_logged
== 1);
2256 lip
->li_cb
= xfs_istale_done
;
2257 xfs_trans_ail_copy_lsn(mp
->m_ail
,
2258 &iip
->ili_flush_lsn
,
2259 &iip
->ili_item
.li_lsn
);
2260 xfs_iflags_set(iip
->ili_inode
, XFS_ISTALE
);
2262 lip
= lip
->li_bio_list
;
2267 * For each inode in memory attempt to add it to the inode
2268 * buffer and set it up for being staled on buffer IO
2269 * completion. This is safe as we've locked out tail pushing
2270 * and flushing by locking the buffer.
2272 * We have already marked every inode that was part of a
2273 * transaction stale above, which means there is no point in
2274 * even trying to lock them.
2276 for (i
= 0; i
< inodes_per_cluster
; i
++) {
2279 ip
= radix_tree_lookup(&pag
->pag_ici_root
,
2280 XFS_INO_TO_AGINO(mp
, (inum
+ i
)));
2282 /* Inode not in memory, nothing to do */
2289 * because this is an RCU protected lookup, we could
2290 * find a recently freed or even reallocated inode
2291 * during the lookup. We need to check under the
2292 * i_flags_lock for a valid inode here. Skip it if it
2293 * is not valid, the wrong inode or stale.
2295 spin_lock(&ip
->i_flags_lock
);
2296 if (ip
->i_ino
!= inum
+ i
||
2297 __xfs_iflags_test(ip
, XFS_ISTALE
)) {
2298 spin_unlock(&ip
->i_flags_lock
);
2302 spin_unlock(&ip
->i_flags_lock
);
2305 * Don't try to lock/unlock the current inode, but we
2306 * _cannot_ skip the other inodes that we did not find
2307 * in the list attached to the buffer and are not
2308 * already marked stale. If we can't lock it, back off
2311 if (ip
!= free_ip
&&
2312 !xfs_ilock_nowait(ip
, XFS_ILOCK_EXCL
)) {
2320 xfs_iflags_set(ip
, XFS_ISTALE
);
2323 * we don't need to attach clean inodes or those only
2324 * with unlogged changes (which we throw away, anyway).
2327 if (!iip
|| xfs_inode_clean(ip
)) {
2328 ASSERT(ip
!= free_ip
);
2330 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
2334 iip
->ili_last_fields
= iip
->ili_fields
;
2335 iip
->ili_fields
= 0;
2336 iip
->ili_fsync_fields
= 0;
2337 iip
->ili_logged
= 1;
2338 xfs_trans_ail_copy_lsn(mp
->m_ail
, &iip
->ili_flush_lsn
,
2339 &iip
->ili_item
.li_lsn
);
2341 xfs_buf_attach_iodone(bp
, xfs_istale_done
,
2345 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
2348 xfs_trans_stale_inode_buf(tp
, bp
);
2349 xfs_trans_binval(tp
, bp
);
2357 * This is called to return an inode to the inode free list.
2358 * The inode should already be truncated to 0 length and have
2359 * no pages associated with it. This routine also assumes that
2360 * the inode is already a part of the transaction.
2362 * The on-disk copy of the inode will have been added to the list
2363 * of unlinked inodes in the AGI. We need to remove the inode from
2364 * that list atomically with respect to freeing it here.
2370 xfs_bmap_free_t
*flist
)
2373 struct xfs_icluster xic
= { 0 };
2375 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
));
2376 ASSERT(VFS_I(ip
)->i_nlink
== 0);
2377 ASSERT(ip
->i_d
.di_nextents
== 0);
2378 ASSERT(ip
->i_d
.di_anextents
== 0);
2379 ASSERT(ip
->i_d
.di_size
== 0 || !S_ISREG(VFS_I(ip
)->i_mode
));
2380 ASSERT(ip
->i_d
.di_nblocks
== 0);
2383 * Pull the on-disk inode from the AGI unlinked list.
2385 error
= xfs_iunlink_remove(tp
, ip
);
2389 error
= xfs_difree(tp
, ip
->i_ino
, flist
, &xic
);
2393 VFS_I(ip
)->i_mode
= 0; /* mark incore inode as free */
2394 ip
->i_d
.di_flags
= 0;
2395 ip
->i_d
.di_dmevmask
= 0;
2396 ip
->i_d
.di_forkoff
= 0; /* mark the attr fork not in use */
2397 ip
->i_d
.di_format
= XFS_DINODE_FMT_EXTENTS
;
2398 ip
->i_d
.di_aformat
= XFS_DINODE_FMT_EXTENTS
;
2400 * Bump the generation count so no one will be confused
2401 * by reincarnations of this inode.
2403 VFS_I(ip
)->i_generation
++;
2404 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
2407 error
= xfs_ifree_cluster(ip
, tp
, &xic
);
2413 * This is called to unpin an inode. The caller must have the inode locked
2414 * in at least shared mode so that the buffer cannot be subsequently pinned
2415 * once someone is waiting for it to be unpinned.
2419 struct xfs_inode
*ip
)
2421 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
|XFS_ILOCK_SHARED
));
2423 trace_xfs_inode_unpin_nowait(ip
, _RET_IP_
);
2425 /* Give the log a push to start the unpinning I/O */
2426 xfs_log_force_lsn(ip
->i_mount
, ip
->i_itemp
->ili_last_lsn
, 0);
2432 struct xfs_inode
*ip
)
2434 wait_queue_head_t
*wq
= bit_waitqueue(&ip
->i_flags
, __XFS_IPINNED_BIT
);
2435 DEFINE_WAIT_BIT(wait
, &ip
->i_flags
, __XFS_IPINNED_BIT
);
2440 prepare_to_wait(wq
, &wait
.wait
, TASK_UNINTERRUPTIBLE
);
2441 if (xfs_ipincount(ip
))
2443 } while (xfs_ipincount(ip
));
2444 finish_wait(wq
, &wait
.wait
);
2449 struct xfs_inode
*ip
)
2451 if (xfs_ipincount(ip
))
2452 __xfs_iunpin_wait(ip
);
2456 * Removing an inode from the namespace involves removing the directory entry
2457 * and dropping the link count on the inode. Removing the directory entry can
2458 * result in locking an AGF (directory blocks were freed) and removing a link
2459 * count can result in placing the inode on an unlinked list which results in
2462 * The big problem here is that we have an ordering constraint on AGF and AGI
2463 * locking - inode allocation locks the AGI, then can allocate a new extent for
2464 * new inodes, locking the AGF after the AGI. Similarly, freeing the inode
2465 * removes the inode from the unlinked list, requiring that we lock the AGI
2466 * first, and then freeing the inode can result in an inode chunk being freed
2467 * and hence freeing disk space requiring that we lock an AGF.
2469 * Hence the ordering that is imposed by other parts of the code is AGI before
2470 * AGF. This means we cannot remove the directory entry before we drop the inode
2471 * reference count and put it on the unlinked list as this results in a lock
2472 * order of AGF then AGI, and this can deadlock against inode allocation and
2473 * freeing. Therefore we must drop the link counts before we remove the
2476 * This is still safe from a transactional point of view - it is not until we
2477 * get to xfs_bmap_finish() that we have the possibility of multiple
2478 * transactions in this operation. Hence as long as we remove the directory
2479 * entry and drop the link count in the first transaction of the remove
2480 * operation, there are no transactional constraints on the ordering here.
2485 struct xfs_name
*name
,
2488 xfs_mount_t
*mp
= dp
->i_mount
;
2489 xfs_trans_t
*tp
= NULL
;
2490 int is_dir
= S_ISDIR(VFS_I(ip
)->i_mode
);
2492 xfs_bmap_free_t free_list
;
2493 xfs_fsblock_t first_block
;
2496 trace_xfs_remove(dp
, name
);
2498 if (XFS_FORCED_SHUTDOWN(mp
))
2501 error
= xfs_qm_dqattach(dp
, 0);
2505 error
= xfs_qm_dqattach(ip
, 0);
2510 * We try to get the real space reservation first,
2511 * allowing for directory btree deletion(s) implying
2512 * possible bmap insert(s). If we can't get the space
2513 * reservation then we use 0 instead, and avoid the bmap
2514 * btree insert(s) in the directory code by, if the bmap
2515 * insert tries to happen, instead trimming the LAST
2516 * block from the directory.
2518 resblks
= XFS_REMOVE_SPACE_RES(mp
);
2519 error
= xfs_trans_alloc(mp
, &M_RES(mp
)->tr_remove
, resblks
, 0, 0, &tp
);
2520 if (error
== -ENOSPC
) {
2522 error
= xfs_trans_alloc(mp
, &M_RES(mp
)->tr_remove
, 0, 0, 0,
2526 ASSERT(error
!= -ENOSPC
);
2530 xfs_ilock(dp
, XFS_IOLOCK_EXCL
| XFS_IOLOCK_PARENT
);
2531 xfs_lock_two_inodes(dp
, ip
, XFS_ILOCK_EXCL
);
2533 xfs_trans_ijoin(tp
, dp
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
2534 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
2537 * If we're removing a directory perform some additional validation.
2540 ASSERT(VFS_I(ip
)->i_nlink
>= 2);
2541 if (VFS_I(ip
)->i_nlink
!= 2) {
2543 goto out_trans_cancel
;
2545 if (!xfs_dir_isempty(ip
)) {
2547 goto out_trans_cancel
;
2550 /* Drop the link from ip's "..". */
2551 error
= xfs_droplink(tp
, dp
);
2553 goto out_trans_cancel
;
2555 /* Drop the "." link from ip to self. */
2556 error
= xfs_droplink(tp
, ip
);
2558 goto out_trans_cancel
;
2561 * When removing a non-directory we need to log the parent
2562 * inode here. For a directory this is done implicitly
2563 * by the xfs_droplink call for the ".." entry.
2565 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);
2567 xfs_trans_ichgtime(tp
, dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
2569 /* Drop the link from dp to ip. */
2570 error
= xfs_droplink(tp
, ip
);
2572 goto out_trans_cancel
;
2574 xfs_bmap_init(&free_list
, &first_block
);
2575 error
= xfs_dir_removename(tp
, dp
, name
, ip
->i_ino
,
2576 &first_block
, &free_list
, resblks
);
2578 ASSERT(error
!= -ENOENT
);
2579 goto out_bmap_cancel
;
2583 * If this is a synchronous mount, make sure that the
2584 * remove transaction goes to disk before returning to
2587 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
))
2588 xfs_trans_set_sync(tp
);
2590 error
= xfs_bmap_finish(&tp
, &free_list
, NULL
);
2592 goto out_bmap_cancel
;
2594 error
= xfs_trans_commit(tp
);
2598 if (is_dir
&& xfs_inode_is_filestream(ip
))
2599 xfs_filestream_deassociate(ip
);
2604 xfs_bmap_cancel(&free_list
);
2606 xfs_trans_cancel(tp
);
2612 * Enter all inodes for a rename transaction into a sorted array.
2614 #define __XFS_SORT_INODES 5
2616 xfs_sort_for_rename(
2617 struct xfs_inode
*dp1
, /* in: old (source) directory inode */
2618 struct xfs_inode
*dp2
, /* in: new (target) directory inode */
2619 struct xfs_inode
*ip1
, /* in: inode of old entry */
2620 struct xfs_inode
*ip2
, /* in: inode of new entry */
2621 struct xfs_inode
*wip
, /* in: whiteout inode */
2622 struct xfs_inode
**i_tab
,/* out: sorted array of inodes */
2623 int *num_inodes
) /* in/out: inodes in array */
2627 ASSERT(*num_inodes
== __XFS_SORT_INODES
);
2628 memset(i_tab
, 0, *num_inodes
* sizeof(struct xfs_inode
*));
2631 * i_tab contains a list of pointers to inodes. We initialize
2632 * the table here & we'll sort it. We will then use it to
2633 * order the acquisition of the inode locks.
2635 * Note that the table may contain duplicates. e.g., dp1 == dp2.
2648 * Sort the elements via bubble sort. (Remember, there are at
2649 * most 5 elements to sort, so this is adequate.)
2651 for (i
= 0; i
< *num_inodes
; i
++) {
2652 for (j
= 1; j
< *num_inodes
; j
++) {
2653 if (i_tab
[j
]->i_ino
< i_tab
[j
-1]->i_ino
) {
2654 struct xfs_inode
*temp
= i_tab
[j
];
2655 i_tab
[j
] = i_tab
[j
-1];
2664 struct xfs_trans
*tp
,
2665 struct xfs_bmap_free
*free_list
)
2670 * If this is a synchronous mount, make sure that the rename transaction
2671 * goes to disk before returning to the user.
2673 if (tp
->t_mountp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
))
2674 xfs_trans_set_sync(tp
);
2676 error
= xfs_bmap_finish(&tp
, free_list
, NULL
);
2678 xfs_bmap_cancel(free_list
);
2679 xfs_trans_cancel(tp
);
2683 return xfs_trans_commit(tp
);
2687 * xfs_cross_rename()
2689 * responsible for handling RENAME_EXCHANGE flag in renameat2() sytemcall
2693 struct xfs_trans
*tp
,
2694 struct xfs_inode
*dp1
,
2695 struct xfs_name
*name1
,
2696 struct xfs_inode
*ip1
,
2697 struct xfs_inode
*dp2
,
2698 struct xfs_name
*name2
,
2699 struct xfs_inode
*ip2
,
2700 struct xfs_bmap_free
*free_list
,
2701 xfs_fsblock_t
*first_block
,
2709 /* Swap inode number for dirent in first parent */
2710 error
= xfs_dir_replace(tp
, dp1
, name1
,
2712 first_block
, free_list
, spaceres
);
2714 goto out_trans_abort
;
2716 /* Swap inode number for dirent in second parent */
2717 error
= xfs_dir_replace(tp
, dp2
, name2
,
2719 first_block
, free_list
, spaceres
);
2721 goto out_trans_abort
;
2724 * If we're renaming one or more directories across different parents,
2725 * update the respective ".." entries (and link counts) to match the new
2729 dp2_flags
= XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
;
2731 if (S_ISDIR(VFS_I(ip2
)->i_mode
)) {
2732 error
= xfs_dir_replace(tp
, ip2
, &xfs_name_dotdot
,
2733 dp1
->i_ino
, first_block
,
2734 free_list
, spaceres
);
2736 goto out_trans_abort
;
2738 /* transfer ip2 ".." reference to dp1 */
2739 if (!S_ISDIR(VFS_I(ip1
)->i_mode
)) {
2740 error
= xfs_droplink(tp
, dp2
);
2742 goto out_trans_abort
;
2743 error
= xfs_bumplink(tp
, dp1
);
2745 goto out_trans_abort
;
2749 * Although ip1 isn't changed here, userspace needs
2750 * to be warned about the change, so that applications
2751 * relying on it (like backup ones), will properly
2754 ip1_flags
|= XFS_ICHGTIME_CHG
;
2755 ip2_flags
|= XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
;
2758 if (S_ISDIR(VFS_I(ip1
)->i_mode
)) {
2759 error
= xfs_dir_replace(tp
, ip1
, &xfs_name_dotdot
,
2760 dp2
->i_ino
, first_block
,
2761 free_list
, spaceres
);
2763 goto out_trans_abort
;
2765 /* transfer ip1 ".." reference to dp2 */
2766 if (!S_ISDIR(VFS_I(ip2
)->i_mode
)) {
2767 error
= xfs_droplink(tp
, dp1
);
2769 goto out_trans_abort
;
2770 error
= xfs_bumplink(tp
, dp2
);
2772 goto out_trans_abort
;
2776 * Although ip2 isn't changed here, userspace needs
2777 * to be warned about the change, so that applications
2778 * relying on it (like backup ones), will properly
2781 ip1_flags
|= XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
;
2782 ip2_flags
|= XFS_ICHGTIME_CHG
;
2787 xfs_trans_ichgtime(tp
, ip1
, ip1_flags
);
2788 xfs_trans_log_inode(tp
, ip1
, XFS_ILOG_CORE
);
2791 xfs_trans_ichgtime(tp
, ip2
, ip2_flags
);
2792 xfs_trans_log_inode(tp
, ip2
, XFS_ILOG_CORE
);
2795 xfs_trans_ichgtime(tp
, dp2
, dp2_flags
);
2796 xfs_trans_log_inode(tp
, dp2
, XFS_ILOG_CORE
);
2798 xfs_trans_ichgtime(tp
, dp1
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
2799 xfs_trans_log_inode(tp
, dp1
, XFS_ILOG_CORE
);
2800 return xfs_finish_rename(tp
, free_list
);
2803 xfs_bmap_cancel(free_list
);
2804 xfs_trans_cancel(tp
);
2809 * xfs_rename_alloc_whiteout()
2811 * Return a referenced, unlinked, unlocked inode that that can be used as a
2812 * whiteout in a rename transaction. We use a tmpfile inode here so that if we
2813 * crash between allocating the inode and linking it into the rename transaction
2814 * recovery will free the inode and we won't leak it.
2817 xfs_rename_alloc_whiteout(
2818 struct xfs_inode
*dp
,
2819 struct xfs_inode
**wip
)
2821 struct xfs_inode
*tmpfile
;
2824 error
= xfs_create_tmpfile(dp
, NULL
, S_IFCHR
| WHITEOUT_MODE
, &tmpfile
);
2829 * Prepare the tmpfile inode as if it were created through the VFS.
2830 * Otherwise, the link increment paths will complain about nlink 0->1.
2831 * Drop the link count as done by d_tmpfile(), complete the inode setup
2832 * and flag it as linkable.
2834 drop_nlink(VFS_I(tmpfile
));
2835 xfs_setup_iops(tmpfile
);
2836 xfs_finish_inode_setup(tmpfile
);
2837 VFS_I(tmpfile
)->i_state
|= I_LINKABLE
;
2848 struct xfs_inode
*src_dp
,
2849 struct xfs_name
*src_name
,
2850 struct xfs_inode
*src_ip
,
2851 struct xfs_inode
*target_dp
,
2852 struct xfs_name
*target_name
,
2853 struct xfs_inode
*target_ip
,
2856 struct xfs_mount
*mp
= src_dp
->i_mount
;
2857 struct xfs_trans
*tp
;
2858 struct xfs_bmap_free free_list
;
2859 xfs_fsblock_t first_block
;
2860 struct xfs_inode
*wip
= NULL
; /* whiteout inode */
2861 struct xfs_inode
*inodes
[__XFS_SORT_INODES
];
2862 int num_inodes
= __XFS_SORT_INODES
;
2863 bool new_parent
= (src_dp
!= target_dp
);
2864 bool src_is_directory
= S_ISDIR(VFS_I(src_ip
)->i_mode
);
2868 trace_xfs_rename(src_dp
, target_dp
, src_name
, target_name
);
2870 if ((flags
& RENAME_EXCHANGE
) && !target_ip
)
2874 * If we are doing a whiteout operation, allocate the whiteout inode
2875 * we will be placing at the target and ensure the type is set
2878 if (flags
& RENAME_WHITEOUT
) {
2879 ASSERT(!(flags
& (RENAME_NOREPLACE
| RENAME_EXCHANGE
)));
2880 error
= xfs_rename_alloc_whiteout(target_dp
, &wip
);
2884 /* setup target dirent info as whiteout */
2885 src_name
->type
= XFS_DIR3_FT_CHRDEV
;
2888 xfs_sort_for_rename(src_dp
, target_dp
, src_ip
, target_ip
, wip
,
2889 inodes
, &num_inodes
);
2891 spaceres
= XFS_RENAME_SPACE_RES(mp
, target_name
->len
);
2892 error
= xfs_trans_alloc(mp
, &M_RES(mp
)->tr_rename
, spaceres
, 0, 0, &tp
);
2893 if (error
== -ENOSPC
) {
2895 error
= xfs_trans_alloc(mp
, &M_RES(mp
)->tr_rename
, 0, 0, 0,
2899 goto out_release_wip
;
2902 * Attach the dquots to the inodes
2904 error
= xfs_qm_vop_rename_dqattach(inodes
);
2906 goto out_trans_cancel
;
2909 * Lock all the participating inodes. Depending upon whether
2910 * the target_name exists in the target directory, and
2911 * whether the target directory is the same as the source
2912 * directory, we can lock from 2 to 4 inodes.
2915 xfs_ilock(src_dp
, XFS_IOLOCK_EXCL
| XFS_IOLOCK_PARENT
);
2917 xfs_lock_two_inodes(src_dp
, target_dp
,
2918 XFS_IOLOCK_EXCL
| XFS_IOLOCK_PARENT
);
2920 xfs_lock_inodes(inodes
, num_inodes
, XFS_ILOCK_EXCL
);
2923 * Join all the inodes to the transaction. From this point on,
2924 * we can rely on either trans_commit or trans_cancel to unlock
2927 xfs_trans_ijoin(tp
, src_dp
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
2929 xfs_trans_ijoin(tp
, target_dp
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
2930 xfs_trans_ijoin(tp
, src_ip
, XFS_ILOCK_EXCL
);
2932 xfs_trans_ijoin(tp
, target_ip
, XFS_ILOCK_EXCL
);
2934 xfs_trans_ijoin(tp
, wip
, XFS_ILOCK_EXCL
);
2937 * If we are using project inheritance, we only allow renames
2938 * into our tree when the project IDs are the same; else the
2939 * tree quota mechanism would be circumvented.
2941 if (unlikely((target_dp
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
) &&
2942 (xfs_get_projid(target_dp
) != xfs_get_projid(src_ip
)))) {
2944 goto out_trans_cancel
;
2947 xfs_bmap_init(&free_list
, &first_block
);
2949 /* RENAME_EXCHANGE is unique from here on. */
2950 if (flags
& RENAME_EXCHANGE
)
2951 return xfs_cross_rename(tp
, src_dp
, src_name
, src_ip
,
2952 target_dp
, target_name
, target_ip
,
2953 &free_list
, &first_block
, spaceres
);
2956 * Set up the target.
2958 if (target_ip
== NULL
) {
2960 * If there's no space reservation, check the entry will
2961 * fit before actually inserting it.
2964 error
= xfs_dir_canenter(tp
, target_dp
, target_name
);
2966 goto out_trans_cancel
;
2969 * If target does not exist and the rename crosses
2970 * directories, adjust the target directory link count
2971 * to account for the ".." reference from the new entry.
2973 error
= xfs_dir_createname(tp
, target_dp
, target_name
,
2974 src_ip
->i_ino
, &first_block
,
2975 &free_list
, spaceres
);
2977 goto out_bmap_cancel
;
2979 xfs_trans_ichgtime(tp
, target_dp
,
2980 XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
2982 if (new_parent
&& src_is_directory
) {
2983 error
= xfs_bumplink(tp
, target_dp
);
2985 goto out_bmap_cancel
;
2987 } else { /* target_ip != NULL */
2989 * If target exists and it's a directory, check that both
2990 * target and source are directories and that target can be
2991 * destroyed, or that neither is a directory.
2993 if (S_ISDIR(VFS_I(target_ip
)->i_mode
)) {
2995 * Make sure target dir is empty.
2997 if (!(xfs_dir_isempty(target_ip
)) ||
2998 (VFS_I(target_ip
)->i_nlink
> 2)) {
3000 goto out_trans_cancel
;
3005 * Link the source inode under the target name.
3006 * If the source inode is a directory and we are moving
3007 * it across directories, its ".." entry will be
3008 * inconsistent until we replace that down below.
3010 * In case there is already an entry with the same
3011 * name at the destination directory, remove it first.
3013 error
= xfs_dir_replace(tp
, target_dp
, target_name
,
3015 &first_block
, &free_list
, spaceres
);
3017 goto out_bmap_cancel
;
3019 xfs_trans_ichgtime(tp
, target_dp
,
3020 XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
3023 * Decrement the link count on the target since the target
3024 * dir no longer points to it.
3026 error
= xfs_droplink(tp
, target_ip
);
3028 goto out_bmap_cancel
;
3030 if (src_is_directory
) {
3032 * Drop the link from the old "." entry.
3034 error
= xfs_droplink(tp
, target_ip
);
3036 goto out_bmap_cancel
;
3038 } /* target_ip != NULL */
3041 * Remove the source.
3043 if (new_parent
&& src_is_directory
) {
3045 * Rewrite the ".." entry to point to the new
3048 error
= xfs_dir_replace(tp
, src_ip
, &xfs_name_dotdot
,
3050 &first_block
, &free_list
, spaceres
);
3051 ASSERT(error
!= -EEXIST
);
3053 goto out_bmap_cancel
;
3057 * We always want to hit the ctime on the source inode.
3059 * This isn't strictly required by the standards since the source
3060 * inode isn't really being changed, but old unix file systems did
3061 * it and some incremental backup programs won't work without it.
3063 xfs_trans_ichgtime(tp
, src_ip
, XFS_ICHGTIME_CHG
);
3064 xfs_trans_log_inode(tp
, src_ip
, XFS_ILOG_CORE
);
3067 * Adjust the link count on src_dp. This is necessary when
3068 * renaming a directory, either within one parent when
3069 * the target existed, or across two parent directories.
3071 if (src_is_directory
&& (new_parent
|| target_ip
!= NULL
)) {
3074 * Decrement link count on src_directory since the
3075 * entry that's moved no longer points to it.
3077 error
= xfs_droplink(tp
, src_dp
);
3079 goto out_bmap_cancel
;
3083 * For whiteouts, we only need to update the source dirent with the
3084 * inode number of the whiteout inode rather than removing it
3088 error
= xfs_dir_replace(tp
, src_dp
, src_name
, wip
->i_ino
,
3089 &first_block
, &free_list
, spaceres
);
3091 error
= xfs_dir_removename(tp
, src_dp
, src_name
, src_ip
->i_ino
,
3092 &first_block
, &free_list
, spaceres
);
3094 goto out_bmap_cancel
;
3097 * For whiteouts, we need to bump the link count on the whiteout inode.
3098 * This means that failures all the way up to this point leave the inode
3099 * on the unlinked list and so cleanup is a simple matter of dropping
3100 * the remaining reference to it. If we fail here after bumping the link
3101 * count, we're shutting down the filesystem so we'll never see the
3102 * intermediate state on disk.
3105 ASSERT(VFS_I(wip
)->i_nlink
== 0);
3106 error
= xfs_bumplink(tp
, wip
);
3108 goto out_bmap_cancel
;
3109 error
= xfs_iunlink_remove(tp
, wip
);
3111 goto out_bmap_cancel
;
3112 xfs_trans_log_inode(tp
, wip
, XFS_ILOG_CORE
);
3115 * Now we have a real link, clear the "I'm a tmpfile" state
3116 * flag from the inode so it doesn't accidentally get misused in
3119 VFS_I(wip
)->i_state
&= ~I_LINKABLE
;
3122 xfs_trans_ichgtime(tp
, src_dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
3123 xfs_trans_log_inode(tp
, src_dp
, XFS_ILOG_CORE
);
3125 xfs_trans_log_inode(tp
, target_dp
, XFS_ILOG_CORE
);
3127 error
= xfs_finish_rename(tp
, &free_list
);
3133 xfs_bmap_cancel(&free_list
);
3135 xfs_trans_cancel(tp
);
3144 struct xfs_inode
*ip
,
3147 struct xfs_mount
*mp
= ip
->i_mount
;
3148 struct xfs_perag
*pag
;
3149 unsigned long first_index
, mask
;
3150 unsigned long inodes_per_cluster
;
3152 struct xfs_inode
**cilist
;
3153 struct xfs_inode
*cip
;
3159 pag
= xfs_perag_get(mp
, XFS_INO_TO_AGNO(mp
, ip
->i_ino
));
3161 inodes_per_cluster
= mp
->m_inode_cluster_size
>> mp
->m_sb
.sb_inodelog
;
3162 cilist_size
= inodes_per_cluster
* sizeof(xfs_inode_t
*);
3163 cilist
= kmem_alloc(cilist_size
, KM_MAYFAIL
|KM_NOFS
);
3167 mask
= ~(((mp
->m_inode_cluster_size
>> mp
->m_sb
.sb_inodelog
)) - 1);
3168 first_index
= XFS_INO_TO_AGINO(mp
, ip
->i_ino
) & mask
;
3170 /* really need a gang lookup range call here */
3171 nr_found
= radix_tree_gang_lookup(&pag
->pag_ici_root
, (void**)cilist
,
3172 first_index
, inodes_per_cluster
);
3176 for (i
= 0; i
< nr_found
; i
++) {
3182 * because this is an RCU protected lookup, we could find a
3183 * recently freed or even reallocated inode during the lookup.
3184 * We need to check under the i_flags_lock for a valid inode
3185 * here. Skip it if it is not valid or the wrong inode.
3187 spin_lock(&cip
->i_flags_lock
);
3189 __xfs_iflags_test(cip
, XFS_ISTALE
)) {
3190 spin_unlock(&cip
->i_flags_lock
);
3195 * Once we fall off the end of the cluster, no point checking
3196 * any more inodes in the list because they will also all be
3197 * outside the cluster.
3199 if ((XFS_INO_TO_AGINO(mp
, cip
->i_ino
) & mask
) != first_index
) {
3200 spin_unlock(&cip
->i_flags_lock
);
3203 spin_unlock(&cip
->i_flags_lock
);
3206 * Do an un-protected check to see if the inode is dirty and
3207 * is a candidate for flushing. These checks will be repeated
3208 * later after the appropriate locks are acquired.
3210 if (xfs_inode_clean(cip
) && xfs_ipincount(cip
) == 0)
3214 * Try to get locks. If any are unavailable or it is pinned,
3215 * then this inode cannot be flushed and is skipped.
3218 if (!xfs_ilock_nowait(cip
, XFS_ILOCK_SHARED
))
3220 if (!xfs_iflock_nowait(cip
)) {
3221 xfs_iunlock(cip
, XFS_ILOCK_SHARED
);
3224 if (xfs_ipincount(cip
)) {
3226 xfs_iunlock(cip
, XFS_ILOCK_SHARED
);
3232 * Check the inode number again, just to be certain we are not
3233 * racing with freeing in xfs_reclaim_inode(). See the comments
3234 * in that function for more information as to why the initial
3235 * check is not sufficient.
3239 xfs_iunlock(cip
, XFS_ILOCK_SHARED
);
3244 * arriving here means that this inode can be flushed. First
3245 * re-check that it's dirty before flushing.
3247 if (!xfs_inode_clean(cip
)) {
3249 error
= xfs_iflush_int(cip
, bp
);
3251 xfs_iunlock(cip
, XFS_ILOCK_SHARED
);
3252 goto cluster_corrupt_out
;
3258 xfs_iunlock(cip
, XFS_ILOCK_SHARED
);
3262 XFS_STATS_INC(mp
, xs_icluster_flushcnt
);
3263 XFS_STATS_ADD(mp
, xs_icluster_flushinode
, clcount
);
3274 cluster_corrupt_out
:
3276 * Corruption detected in the clustering loop. Invalidate the
3277 * inode buffer and shut down the filesystem.
3281 * Clean up the buffer. If it was delwri, just release it --
3282 * brelse can handle it with no problems. If not, shut down the
3283 * filesystem before releasing the buffer.
3285 bufwasdelwri
= (bp
->b_flags
& _XBF_DELWRI_Q
);
3289 xfs_force_shutdown(mp
, SHUTDOWN_CORRUPT_INCORE
);
3291 if (!bufwasdelwri
) {
3293 * Just like incore_relse: if we have b_iodone functions,
3294 * mark the buffer as an error and call them. Otherwise
3295 * mark it as stale and brelse.
3298 bp
->b_flags
&= ~XBF_DONE
;
3300 xfs_buf_ioerror(bp
, -EIO
);
3309 * Unlocks the flush lock
3311 xfs_iflush_abort(cip
, false);
3314 return -EFSCORRUPTED
;
3318 * Flush dirty inode metadata into the backing buffer.
3320 * The caller must have the inode lock and the inode flush lock held. The
3321 * inode lock will still be held upon return to the caller, and the inode
3322 * flush lock will be released after the inode has reached the disk.
3324 * The caller must write out the buffer returned in *bpp and release it.
3328 struct xfs_inode
*ip
,
3329 struct xfs_buf
**bpp
)
3331 struct xfs_mount
*mp
= ip
->i_mount
;
3332 struct xfs_buf
*bp
= NULL
;
3333 struct xfs_dinode
*dip
;
3336 XFS_STATS_INC(mp
, xs_iflush_count
);
3338 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
|XFS_ILOCK_SHARED
));
3339 ASSERT(xfs_isiflocked(ip
));
3340 ASSERT(ip
->i_d
.di_format
!= XFS_DINODE_FMT_BTREE
||
3341 ip
->i_d
.di_nextents
> XFS_IFORK_MAXEXT(ip
, XFS_DATA_FORK
));
3345 xfs_iunpin_wait(ip
);
3348 * For stale inodes we cannot rely on the backing buffer remaining
3349 * stale in cache for the remaining life of the stale inode and so
3350 * xfs_imap_to_bp() below may give us a buffer that no longer contains
3351 * inodes below. We have to check this after ensuring the inode is
3352 * unpinned so that it is safe to reclaim the stale inode after the
3355 if (xfs_iflags_test(ip
, XFS_ISTALE
)) {
3361 * This may have been unpinned because the filesystem is shutting
3362 * down forcibly. If that's the case we must not write this inode
3363 * to disk, because the log record didn't make it to disk.
3365 * We also have to remove the log item from the AIL in this case,
3366 * as we wait for an empty AIL as part of the unmount process.
3368 if (XFS_FORCED_SHUTDOWN(mp
)) {
3374 * Get the buffer containing the on-disk inode. We are doing a try-lock
3375 * operation here, so we may get an EAGAIN error. In that case, we
3376 * simply want to return with the inode still dirty.
3378 * If we get any other error, we effectively have a corruption situation
3379 * and we cannot flush the inode, so we treat it the same as failing
3382 error
= xfs_imap_to_bp(mp
, NULL
, &ip
->i_imap
, &dip
, &bp
, XBF_TRYLOCK
,
3384 if (error
== -EAGAIN
) {
3392 * First flush out the inode that xfs_iflush was called with.
3394 error
= xfs_iflush_int(ip
, bp
);
3399 * If the buffer is pinned then push on the log now so we won't
3400 * get stuck waiting in the write for too long.
3402 if (xfs_buf_ispinned(bp
))
3403 xfs_log_force(mp
, 0);
3407 * see if other inodes can be gathered into this write
3409 error
= xfs_iflush_cluster(ip
, bp
);
3411 goto cluster_corrupt_out
;
3419 xfs_force_shutdown(mp
, SHUTDOWN_CORRUPT_INCORE
);
3420 cluster_corrupt_out
:
3421 error
= -EFSCORRUPTED
;
3424 * Unlocks the flush lock
3426 xfs_iflush_abort(ip
, false);
3432 struct xfs_inode
*ip
,
3435 struct xfs_inode_log_item
*iip
= ip
->i_itemp
;
3436 struct xfs_dinode
*dip
;
3437 struct xfs_mount
*mp
= ip
->i_mount
;
3439 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
|XFS_ILOCK_SHARED
));
3440 ASSERT(xfs_isiflocked(ip
));
3441 ASSERT(ip
->i_d
.di_format
!= XFS_DINODE_FMT_BTREE
||
3442 ip
->i_d
.di_nextents
> XFS_IFORK_MAXEXT(ip
, XFS_DATA_FORK
));
3443 ASSERT(iip
!= NULL
&& iip
->ili_fields
!= 0);
3444 ASSERT(ip
->i_d
.di_version
> 1);
3446 /* set *dip = inode's place in the buffer */
3447 dip
= xfs_buf_offset(bp
, ip
->i_imap
.im_boffset
);
3449 if (XFS_TEST_ERROR(dip
->di_magic
!= cpu_to_be16(XFS_DINODE_MAGIC
),
3450 mp
, XFS_ERRTAG_IFLUSH_1
, XFS_RANDOM_IFLUSH_1
)) {
3451 xfs_alert_tag(mp
, XFS_PTAG_IFLUSH
,
3452 "%s: Bad inode %Lu magic number 0x%x, ptr 0x%p",
3453 __func__
, ip
->i_ino
, be16_to_cpu(dip
->di_magic
), dip
);
3456 if (S_ISREG(VFS_I(ip
)->i_mode
)) {
3458 (ip
->i_d
.di_format
!= XFS_DINODE_FMT_EXTENTS
) &&
3459 (ip
->i_d
.di_format
!= XFS_DINODE_FMT_BTREE
),
3460 mp
, XFS_ERRTAG_IFLUSH_3
, XFS_RANDOM_IFLUSH_3
)) {
3461 xfs_alert_tag(mp
, XFS_PTAG_IFLUSH
,
3462 "%s: Bad regular inode %Lu, ptr 0x%p",
3463 __func__
, ip
->i_ino
, ip
);
3466 } else if (S_ISDIR(VFS_I(ip
)->i_mode
)) {
3468 (ip
->i_d
.di_format
!= XFS_DINODE_FMT_EXTENTS
) &&
3469 (ip
->i_d
.di_format
!= XFS_DINODE_FMT_BTREE
) &&
3470 (ip
->i_d
.di_format
!= XFS_DINODE_FMT_LOCAL
),
3471 mp
, XFS_ERRTAG_IFLUSH_4
, XFS_RANDOM_IFLUSH_4
)) {
3472 xfs_alert_tag(mp
, XFS_PTAG_IFLUSH
,
3473 "%s: Bad directory inode %Lu, ptr 0x%p",
3474 __func__
, ip
->i_ino
, ip
);
3478 if (XFS_TEST_ERROR(ip
->i_d
.di_nextents
+ ip
->i_d
.di_anextents
>
3479 ip
->i_d
.di_nblocks
, mp
, XFS_ERRTAG_IFLUSH_5
,
3480 XFS_RANDOM_IFLUSH_5
)) {
3481 xfs_alert_tag(mp
, XFS_PTAG_IFLUSH
,
3482 "%s: detected corrupt incore inode %Lu, "
3483 "total extents = %d, nblocks = %Ld, ptr 0x%p",
3484 __func__
, ip
->i_ino
,
3485 ip
->i_d
.di_nextents
+ ip
->i_d
.di_anextents
,
3486 ip
->i_d
.di_nblocks
, ip
);
3489 if (XFS_TEST_ERROR(ip
->i_d
.di_forkoff
> mp
->m_sb
.sb_inodesize
,
3490 mp
, XFS_ERRTAG_IFLUSH_6
, XFS_RANDOM_IFLUSH_6
)) {
3491 xfs_alert_tag(mp
, XFS_PTAG_IFLUSH
,
3492 "%s: bad inode %Lu, forkoff 0x%x, ptr 0x%p",
3493 __func__
, ip
->i_ino
, ip
->i_d
.di_forkoff
, ip
);
3498 * Inode item log recovery for v2 inodes are dependent on the
3499 * di_flushiter count for correct sequencing. We bump the flush
3500 * iteration count so we can detect flushes which postdate a log record
3501 * during recovery. This is redundant as we now log every change and
3502 * hence this can't happen but we need to still do it to ensure
3503 * backwards compatibility with old kernels that predate logging all
3506 if (ip
->i_d
.di_version
< 3)
3507 ip
->i_d
.di_flushiter
++;
3510 * Copy the dirty parts of the inode into the on-disk inode. We always
3511 * copy out the core of the inode, because if the inode is dirty at all
3514 xfs_inode_to_disk(ip
, dip
, iip
->ili_item
.li_lsn
);
3516 /* Wrap, we never let the log put out DI_MAX_FLUSH */
3517 if (ip
->i_d
.di_flushiter
== DI_MAX_FLUSH
)
3518 ip
->i_d
.di_flushiter
= 0;
3520 xfs_iflush_fork(ip
, dip
, iip
, XFS_DATA_FORK
);
3521 if (XFS_IFORK_Q(ip
))
3522 xfs_iflush_fork(ip
, dip
, iip
, XFS_ATTR_FORK
);
3523 xfs_inobp_check(mp
, bp
);
3526 * We've recorded everything logged in the inode, so we'd like to clear
3527 * the ili_fields bits so we don't log and flush things unnecessarily.
3528 * However, we can't stop logging all this information until the data
3529 * we've copied into the disk buffer is written to disk. If we did we
3530 * might overwrite the copy of the inode in the log with all the data
3531 * after re-logging only part of it, and in the face of a crash we
3532 * wouldn't have all the data we need to recover.
3534 * What we do is move the bits to the ili_last_fields field. When
3535 * logging the inode, these bits are moved back to the ili_fields field.
3536 * In the xfs_iflush_done() routine we clear ili_last_fields, since we
3537 * know that the information those bits represent is permanently on
3538 * disk. As long as the flush completes before the inode is logged
3539 * again, then both ili_fields and ili_last_fields will be cleared.
3541 * We can play with the ili_fields bits here, because the inode lock
3542 * must be held exclusively in order to set bits there and the flush
3543 * lock protects the ili_last_fields bits. Set ili_logged so the flush
3544 * done routine can tell whether or not to look in the AIL. Also, store
3545 * the current LSN of the inode so that we can tell whether the item has
3546 * moved in the AIL from xfs_iflush_done(). In order to read the lsn we
3547 * need the AIL lock, because it is a 64 bit value that cannot be read
3550 iip
->ili_last_fields
= iip
->ili_fields
;
3551 iip
->ili_fields
= 0;
3552 iip
->ili_fsync_fields
= 0;
3553 iip
->ili_logged
= 1;
3555 xfs_trans_ail_copy_lsn(mp
->m_ail
, &iip
->ili_flush_lsn
,
3556 &iip
->ili_item
.li_lsn
);
3559 * Attach the function xfs_iflush_done to the inode's
3560 * buffer. This will remove the inode from the AIL
3561 * and unlock the inode's flush lock when the inode is
3562 * completely written to disk.
3564 xfs_buf_attach_iodone(bp
, xfs_iflush_done
, &iip
->ili_item
);
3566 /* generate the checksum. */
3567 xfs_dinode_calc_crc(mp
, dip
);
3569 ASSERT(bp
->b_fspriv
!= NULL
);
3570 ASSERT(bp
->b_iodone
!= NULL
);
3574 return -EFSCORRUPTED
;