2 * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
28 * For further information regarding this notice, see:
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
33 * fs/xfs/linux/xfs_lrw.c (Linux Read Write stuff)
42 #include "xfs_trans.h"
47 #include "xfs_alloc.h"
48 #include "xfs_dmapi.h"
49 #include "xfs_quota.h"
50 #include "xfs_mount.h"
51 #include "xfs_alloc_btree.h"
52 #include "xfs_bmap_btree.h"
53 #include "xfs_ialloc_btree.h"
54 #include "xfs_btree.h"
55 #include "xfs_ialloc.h"
56 #include "xfs_attr_sf.h"
57 #include "xfs_dir_sf.h"
58 #include "xfs_dir2_sf.h"
59 #include "xfs_dinode.h"
60 #include "xfs_inode.h"
63 #include "xfs_rtalloc.h"
64 #include "xfs_error.h"
65 #include "xfs_itable.h"
71 #include "xfs_inode_item.h"
72 #include "xfs_buf_item.h"
73 #include "xfs_utils.h"
74 #include "xfs_iomap.h"
76 #include <linux/capability.h>
77 #include <linux/writeback.h>
80 #if defined(XFS_RW_TRACE)
90 xfs_inode_t
*ip
= XFS_IO_INODE(io
);
92 if (ip
->i_rwtrace
== NULL
)
94 ktrace_enter(ip
->i_rwtrace
,
95 (void *)(unsigned long)tag
,
97 (void *)((unsigned long)((ip
->i_d
.di_size
>> 32) & 0xffffffff)),
98 (void *)((unsigned long)(ip
->i_d
.di_size
& 0xffffffff)),
100 (void *)((unsigned long)segs
),
101 (void *)((unsigned long)((offset
>> 32) & 0xffffffff)),
102 (void *)((unsigned long)(offset
& 0xffffffff)),
103 (void *)((unsigned long)ioflags
),
104 (void *)((unsigned long)((io
->io_new_size
>> 32) & 0xffffffff)),
105 (void *)((unsigned long)(io
->io_new_size
& 0xffffffff)),
114 xfs_inval_cached_trace(
121 xfs_inode_t
*ip
= XFS_IO_INODE(io
);
123 if (ip
->i_rwtrace
== NULL
)
125 ktrace_enter(ip
->i_rwtrace
,
126 (void *)(__psint_t
)XFS_INVAL_CACHED
,
128 (void *)((unsigned long)((offset
>> 32) & 0xffffffff)),
129 (void *)((unsigned long)(offset
& 0xffffffff)),
130 (void *)((unsigned long)((len
>> 32) & 0xffffffff)),
131 (void *)((unsigned long)(len
& 0xffffffff)),
132 (void *)((unsigned long)((first
>> 32) & 0xffffffff)),
133 (void *)((unsigned long)(first
& 0xffffffff)),
134 (void *)((unsigned long)((last
>> 32) & 0xffffffff)),
135 (void *)((unsigned long)(last
& 0xffffffff)),
148 * xfs_iozero clears the specified range of buffer supplied,
149 * and marks all the affected blocks as valid and modified. If
150 * an affected block is not allocated, it will be allocated. If
151 * an affected block is not completely overwritten, and is not
152 * valid before the operation, it will be read from disk before
153 * being partially zeroed.
157 struct inode
*ip
, /* inode */
158 loff_t pos
, /* offset in file */
159 size_t count
, /* size of data to zero */
160 loff_t end_size
) /* max file size to set */
164 struct address_space
*mapping
;
168 mapping
= ip
->i_mapping
;
170 unsigned long index
, offset
;
172 offset
= (pos
& (PAGE_CACHE_SIZE
-1)); /* Within page */
173 index
= pos
>> PAGE_CACHE_SHIFT
;
174 bytes
= PAGE_CACHE_SIZE
- offset
;
179 page
= grab_cache_page(mapping
, index
);
184 status
= mapping
->a_ops
->prepare_write(NULL
, page
, offset
,
190 memset((void *) (kaddr
+ offset
), 0, bytes
);
191 flush_dcache_page(page
);
192 status
= mapping
->a_ops
->commit_write(NULL
, page
, offset
,
197 if (pos
> i_size_read(ip
))
198 i_size_write(ip
, pos
< end_size
? pos
: end_size
);
204 page_cache_release(page
);
213 * xfs_inval_cached_pages
215 * This routine is responsible for keeping direct I/O and buffered I/O
216 * somewhat coherent. From here we make sure that we're at least
217 * temporarily holding the inode I/O lock exclusively and then call
218 * the page cache to flush and invalidate any cached pages. If there
219 * are no cached pages this routine will be very quick.
222 xfs_inval_cached_pages(
230 xfs_inval_cached_trace(io
, offset
, -1, ctooff(offtoct(offset
)), -1);
231 VOP_FLUSHINVAL_PAGES(vp
, ctooff(offtoct(offset
)), -1, FI_REMAPF_LOCKED
);
236 ssize_t
/* bytes read, or (-) error */
240 const struct iovec
*iovp
,
246 struct file
*file
= iocb
->ki_filp
;
247 struct inode
*inode
= file
->f_mapping
->host
;
256 ip
= XFS_BHVTOI(bdp
);
257 vp
= BHV_TO_VNODE(bdp
);
260 XFS_STATS_INC(xs_read_calls
);
262 /* START copy & waste from filemap.c */
263 for (seg
= 0; seg
< segs
; seg
++) {
264 const struct iovec
*iv
= &iovp
[seg
];
267 * If any segment has a negative length, or the cumulative
268 * length ever wraps negative then return -EINVAL.
271 if (unlikely((ssize_t
)(size
|iv
->iov_len
) < 0))
272 return XFS_ERROR(-EINVAL
);
274 /* END copy & waste from filemap.c */
276 if (unlikely(ioflags
& IO_ISDIRECT
)) {
277 xfs_buftarg_t
*target
=
278 (ip
->i_d
.di_flags
& XFS_DIFLAG_REALTIME
) ?
279 mp
->m_rtdev_targp
: mp
->m_ddev_targp
;
280 if ((*offset
& target
->pbr_smask
) ||
281 (size
& target
->pbr_smask
)) {
282 if (*offset
== ip
->i_d
.di_size
) {
285 return -XFS_ERROR(EINVAL
);
289 n
= XFS_MAXIOFFSET(mp
) - *offset
;
290 if ((n
<= 0) || (size
== 0))
296 if (XFS_FORCED_SHUTDOWN(mp
)) {
300 if (unlikely(ioflags
& IO_ISDIRECT
))
302 xfs_ilock(ip
, XFS_IOLOCK_SHARED
);
304 if (DM_EVENT_ENABLED(vp
->v_vfsp
, ip
, DM_EVENT_READ
) &&
305 !(ioflags
& IO_INVIS
)) {
306 vrwlock_t locktype
= VRWLOCK_READ
;
308 ret
= -XFS_SEND_DATA(mp
, DM_EVENT_READ
,
309 BHV_TO_VNODE(bdp
), *offset
, size
,
310 FILP_DELAY_FLAG(file
), &locktype
);
312 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
317 xfs_rw_enter_trace(XFS_READ_ENTER
, &ip
->i_iocore
,
318 (void *)iovp
, segs
, *offset
, ioflags
);
319 ret
= __generic_file_aio_read(iocb
, iovp
, segs
, offset
);
320 if (ret
== -EIOCBQUEUED
&& !(ioflags
& IO_ISAIO
))
321 ret
= wait_on_sync_kiocb(iocb
);
323 XFS_STATS_ADD(xs_read_bytes
, ret
);
325 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
327 if (likely(!(ioflags
& IO_INVIS
)))
328 xfs_ichgtime(ip
, XFS_ICHGTIME_ACC
);
331 if (unlikely(ioflags
& IO_ISDIRECT
))
353 ip
= XFS_BHVTOI(bdp
);
354 vp
= BHV_TO_VNODE(bdp
);
357 XFS_STATS_INC(xs_read_calls
);
359 n
= XFS_MAXIOFFSET(mp
) - *offset
;
360 if ((n
<= 0) || (count
== 0))
366 if (XFS_FORCED_SHUTDOWN(ip
->i_mount
))
369 xfs_ilock(ip
, XFS_IOLOCK_SHARED
);
371 if (DM_EVENT_ENABLED(vp
->v_vfsp
, ip
, DM_EVENT_READ
) &&
372 (!(ioflags
& IO_INVIS
))) {
373 vrwlock_t locktype
= VRWLOCK_READ
;
376 error
= XFS_SEND_DATA(mp
, DM_EVENT_READ
, BHV_TO_VNODE(bdp
), *offset
, count
,
377 FILP_DELAY_FLAG(filp
), &locktype
);
379 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
383 xfs_rw_enter_trace(XFS_SENDFILE_ENTER
, &ip
->i_iocore
,
384 (void *)(unsigned long)target
, count
, *offset
, ioflags
);
385 ret
= generic_file_sendfile(filp
, offset
, count
, actor
, target
);
387 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
390 XFS_STATS_ADD(xs_read_bytes
, ret
);
392 if (likely(!(ioflags
& IO_INVIS
)))
393 xfs_ichgtime(ip
, XFS_ICHGTIME_ACC
);
399 * This routine is called to handle zeroing any space in the last
400 * block of the file that is beyond the EOF. We do this since the
401 * size is being increased without writing anything to that block
402 * and we don't want anyone to read the garbage on the disk.
404 STATIC
int /* error (positive) */
410 xfs_fsize_t end_size
)
412 xfs_fileoff_t last_fsb
;
417 int isize_fsb_offset
;
419 xfs_bmbt_irec_t imap
;
423 ASSERT(ismrlocked(io
->io_lock
, MR_UPDATE
) != 0);
424 ASSERT(offset
> isize
);
428 isize_fsb_offset
= XFS_B_FSB_OFFSET(mp
, isize
);
429 if (isize_fsb_offset
== 0) {
431 * There are no extra bytes in the last block on disk to
437 last_fsb
= XFS_B_TO_FSBT(mp
, isize
);
439 error
= XFS_BMAPI(mp
, NULL
, io
, last_fsb
, 1, 0, NULL
, 0, &imap
,
446 * If the block underlying isize is just a hole, then there
447 * is nothing to zero.
449 if (imap
.br_startblock
== HOLESTARTBLOCK
) {
453 * Zero the part of the last block beyond the EOF, and write it
454 * out sync. We need to drop the ilock while we do this so we
455 * don't deadlock when the buffer cache calls back to us.
457 XFS_IUNLOCK(mp
, io
, XFS_ILOCK_EXCL
| XFS_EXTSIZE_RD
);
458 loff
= XFS_FSB_TO_B(mp
, last_fsb
);
459 lsize
= XFS_FSB_TO_B(mp
, 1);
461 zero_offset
= isize_fsb_offset
;
462 zero_len
= mp
->m_sb
.sb_blocksize
- isize_fsb_offset
;
464 error
= xfs_iozero(ip
, loff
+ zero_offset
, zero_len
, end_size
);
466 XFS_ILOCK(mp
, io
, XFS_ILOCK_EXCL
|XFS_EXTSIZE_RD
);
472 * Zero any on disk space between the current EOF and the new,
473 * larger EOF. This handles the normal case of zeroing the remainder
474 * of the last block in the file and the unusual case of zeroing blocks
475 * out beyond the size of the file. This second case only happens
476 * with fixed size extents and when the system crashes before the inode
477 * size was updated but after blocks were allocated. If fill is set,
478 * then any holes in the range are filled and zeroed. If not, the holes
479 * are left alone as holes.
482 int /* error (positive) */
486 xfs_off_t offset
, /* starting I/O offset */
487 xfs_fsize_t isize
, /* current inode size */
488 xfs_fsize_t end_size
) /* terminal inode size */
490 struct inode
*ip
= LINVFS_GET_IP(vp
);
491 xfs_fileoff_t start_zero_fsb
;
492 xfs_fileoff_t end_zero_fsb
;
493 xfs_fileoff_t prev_zero_fsb
;
494 xfs_fileoff_t zero_count_fsb
;
495 xfs_fileoff_t last_fsb
;
496 xfs_extlen_t buf_len_fsb
;
497 xfs_extlen_t prev_zero_count
;
501 xfs_bmbt_irec_t imap
;
505 ASSERT(ismrlocked(io
->io_lock
, MR_UPDATE
));
506 ASSERT(ismrlocked(io
->io_iolock
, MR_UPDATE
));
511 * First handle zeroing the block on which isize resides.
512 * We only zero a part of that block so it is handled specially.
514 error
= xfs_zero_last_block(ip
, io
, offset
, isize
, end_size
);
516 ASSERT(ismrlocked(io
->io_lock
, MR_UPDATE
));
517 ASSERT(ismrlocked(io
->io_iolock
, MR_UPDATE
));
522 * Calculate the range between the new size and the old
523 * where blocks needing to be zeroed may exist. To get the
524 * block where the last byte in the file currently resides,
525 * we need to subtract one from the size and truncate back
526 * to a block boundary. We subtract 1 in case the size is
527 * exactly on a block boundary.
529 last_fsb
= isize
? XFS_B_TO_FSBT(mp
, isize
- 1) : (xfs_fileoff_t
)-1;
530 start_zero_fsb
= XFS_B_TO_FSB(mp
, (xfs_ufsize_t
)isize
);
531 end_zero_fsb
= XFS_B_TO_FSBT(mp
, offset
- 1);
532 ASSERT((xfs_sfiloff_t
)last_fsb
< (xfs_sfiloff_t
)start_zero_fsb
);
533 if (last_fsb
== end_zero_fsb
) {
535 * The size was only incremented on its last block.
536 * We took care of that above, so just return.
541 ASSERT(start_zero_fsb
<= end_zero_fsb
);
542 prev_zero_fsb
= NULLFILEOFF
;
544 while (start_zero_fsb
<= end_zero_fsb
) {
546 zero_count_fsb
= end_zero_fsb
- start_zero_fsb
+ 1;
547 error
= XFS_BMAPI(mp
, NULL
, io
, start_zero_fsb
, zero_count_fsb
,
548 0, NULL
, 0, &imap
, &nimaps
, NULL
);
550 ASSERT(ismrlocked(io
->io_lock
, MR_UPDATE
));
551 ASSERT(ismrlocked(io
->io_iolock
, MR_UPDATE
));
556 if (imap
.br_state
== XFS_EXT_UNWRITTEN
||
557 imap
.br_startblock
== HOLESTARTBLOCK
) {
559 * This loop handles initializing pages that were
560 * partially initialized by the code below this
561 * loop. It basically zeroes the part of the page
562 * that sits on a hole and sets the page as P_HOLE
563 * and calls remapf if it is a mapped file.
565 prev_zero_fsb
= NULLFILEOFF
;
567 start_zero_fsb
= imap
.br_startoff
+
569 ASSERT(start_zero_fsb
<= (end_zero_fsb
+ 1));
574 * There are blocks in the range requested.
575 * Zero them a single write at a time. We actually
576 * don't zero the entire range returned if it is
577 * too big and simply loop around to get the rest.
578 * That is not the most efficient thing to do, but it
579 * is simple and this path should not be exercised often.
581 buf_len_fsb
= XFS_FILBLKS_MIN(imap
.br_blockcount
,
582 mp
->m_writeio_blocks
<< 8);
584 * Drop the inode lock while we're doing the I/O.
585 * We'll still have the iolock to protect us.
587 XFS_IUNLOCK(mp
, io
, XFS_ILOCK_EXCL
|XFS_EXTSIZE_RD
);
589 loff
= XFS_FSB_TO_B(mp
, start_zero_fsb
);
590 lsize
= XFS_FSB_TO_B(mp
, buf_len_fsb
);
592 error
= xfs_iozero(ip
, loff
, lsize
, end_size
);
598 prev_zero_fsb
= start_zero_fsb
;
599 prev_zero_count
= buf_len_fsb
;
600 start_zero_fsb
= imap
.br_startoff
+ buf_len_fsb
;
601 ASSERT(start_zero_fsb
<= (end_zero_fsb
+ 1));
603 XFS_ILOCK(mp
, io
, XFS_ILOCK_EXCL
|XFS_EXTSIZE_RD
);
610 XFS_ILOCK(mp
, io
, XFS_ILOCK_EXCL
|XFS_EXTSIZE_RD
);
615 ssize_t
/* bytes written, or (-) error */
619 const struct iovec
*iovp
,
625 struct file
*file
= iocb
->ki_filp
;
626 struct address_space
*mapping
= file
->f_mapping
;
627 struct inode
*inode
= mapping
->host
;
628 unsigned long segs
= nsegs
;
631 ssize_t ret
= 0, error
= 0;
632 xfs_fsize_t isize
, new_size
;
639 size_t ocount
= 0, count
;
641 int need_isem
= 1, need_flush
= 0;
643 XFS_STATS_INC(xs_write_calls
);
645 vp
= BHV_TO_VNODE(bdp
);
646 xip
= XFS_BHVTOI(bdp
);
648 for (seg
= 0; seg
< segs
; seg
++) {
649 const struct iovec
*iv
= &iovp
[seg
];
652 * If any segment has a negative length, or the cumulative
653 * length ever wraps negative then return -EINVAL.
655 ocount
+= iv
->iov_len
;
656 if (unlikely((ssize_t
)(ocount
|iv
->iov_len
) < 0))
658 if (access_ok(VERIFY_READ
, iv
->iov_base
, iv
->iov_len
))
663 ocount
-= iv
->iov_len
; /* This segment is no good */
676 if (XFS_FORCED_SHUTDOWN(mp
))
679 fs_check_frozen(vp
->v_vfsp
, SB_FREEZE_WRITE
);
681 if (ioflags
& IO_ISDIRECT
) {
682 xfs_buftarg_t
*target
=
683 (xip
->i_d
.di_flags
& XFS_DIFLAG_REALTIME
) ?
684 mp
->m_rtdev_targp
: mp
->m_ddev_targp
;
686 if (ioflags
& IO_ISAIO
)
687 return XFS_ERROR(-ENOSYS
);
689 if ((pos
& target
->pbr_smask
) || (count
& target
->pbr_smask
))
690 return XFS_ERROR(-EINVAL
);
692 if (!VN_CACHED(vp
) && pos
< i_size_read(inode
))
701 iolock
= XFS_IOLOCK_EXCL
;
702 locktype
= VRWLOCK_WRITE
;
706 iolock
= XFS_IOLOCK_SHARED
;
707 locktype
= VRWLOCK_WRITE_DIRECT
;
710 xfs_ilock(xip
, XFS_ILOCK_EXCL
|iolock
);
712 isize
= i_size_read(inode
);
714 if (file
->f_flags
& O_APPEND
)
718 error
= -generic_write_checks(file
, &pos
, &count
,
719 S_ISBLK(inode
->i_mode
));
721 xfs_iunlock(xip
, XFS_ILOCK_EXCL
|iolock
);
722 goto out_unlock_isem
;
725 new_size
= pos
+ count
;
726 if (new_size
> isize
)
727 io
->io_new_size
= new_size
;
729 if ((DM_EVENT_ENABLED(vp
->v_vfsp
, xip
, DM_EVENT_WRITE
) &&
730 !(ioflags
& IO_INVIS
) && !eventsent
)) {
731 loff_t savedsize
= pos
;
732 int dmflags
= FILP_DELAY_FLAG(file
);
735 dmflags
|= DM_FLAGS_ISEM
;
737 xfs_iunlock(xip
, XFS_ILOCK_EXCL
);
738 error
= XFS_SEND_DATA(xip
->i_mount
, DM_EVENT_WRITE
, vp
,
742 xfs_iunlock(xip
, iolock
);
743 goto out_unlock_isem
;
745 xfs_ilock(xip
, XFS_ILOCK_EXCL
);
749 * The iolock was dropped and reaquired in XFS_SEND_DATA
750 * so we have to recheck the size when appending.
751 * We will only "goto start;" once, since having sent the
752 * event prevents another call to XFS_SEND_DATA, which is
753 * what allows the size to change in the first place.
755 if ((file
->f_flags
& O_APPEND
) && savedsize
!= isize
) {
756 pos
= isize
= xip
->i_d
.di_size
;
762 * On Linux, generic_file_write updates the times even if
763 * no data is copied in so long as the write had a size.
765 * We must update xfs' times since revalidate will overcopy xfs.
767 if (!(ioflags
& IO_INVIS
)) {
768 xfs_ichgtime(xip
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
769 inode_update_time(inode
, 1);
773 * If the offset is beyond the size of the file, we have a couple
774 * of things to do. First, if there is already space allocated
775 * we need to either create holes or zero the disk or ...
777 * If there is a page where the previous size lands, we need
778 * to zero it out up to the new size.
782 error
= xfs_zero_eof(BHV_TO_VNODE(bdp
), io
, pos
,
785 xfs_iunlock(xip
, XFS_ILOCK_EXCL
|iolock
);
786 goto out_unlock_isem
;
789 xfs_iunlock(xip
, XFS_ILOCK_EXCL
);
792 * If we're writing the file then make sure to clear the
793 * setuid and setgid bits if the process is not being run
794 * by root. This keeps people from modifying setuid and
798 if (((xip
->i_d
.di_mode
& S_ISUID
) ||
799 ((xip
->i_d
.di_mode
& (S_ISGID
| S_IXGRP
)) ==
800 (S_ISGID
| S_IXGRP
))) &&
801 !capable(CAP_FSETID
)) {
802 error
= xfs_write_clear_setuid(xip
);
804 error
= -remove_suid(file
->f_dentry
);
805 if (unlikely(error
)) {
806 xfs_iunlock(xip
, iolock
);
807 goto out_unlock_isem
;
812 /* We can write back this queue in page reclaim */
813 current
->backing_dev_info
= mapping
->backing_dev_info
;
815 if ((ioflags
& IO_ISDIRECT
)) {
817 xfs_inval_cached_trace(io
, pos
, -1,
818 ctooff(offtoct(pos
)), -1);
819 VOP_FLUSHINVAL_PAGES(vp
, ctooff(offtoct(pos
)),
820 -1, FI_REMAPF_LOCKED
);
824 /* demote the lock now the cached pages are gone */
825 XFS_ILOCK_DEMOTE(mp
, io
, XFS_IOLOCK_EXCL
);
828 iolock
= XFS_IOLOCK_SHARED
;
829 locktype
= VRWLOCK_WRITE_DIRECT
;
833 xfs_rw_enter_trace(XFS_DIOWR_ENTER
, io
, (void *)iovp
, segs
,
835 ret
= generic_file_direct_write(iocb
, iovp
,
836 &segs
, pos
, offset
, count
, ocount
);
839 * direct-io write to a hole: fall through to buffered I/O
840 * for completing the rest of the request.
842 if (ret
>= 0 && ret
!= count
) {
843 XFS_STATS_ADD(xs_write_bytes
, ret
);
849 ioflags
&= ~IO_ISDIRECT
;
850 xfs_iunlock(xip
, iolock
);
854 xfs_rw_enter_trace(XFS_WRITE_ENTER
, io
, (void *)iovp
, segs
,
856 ret
= generic_file_buffered_write(iocb
, iovp
, segs
,
857 pos
, offset
, count
, ret
);
860 current
->backing_dev_info
= NULL
;
862 if (ret
== -EIOCBQUEUED
&& !(ioflags
& IO_ISAIO
))
863 ret
= wait_on_sync_kiocb(iocb
);
865 if ((ret
== -ENOSPC
) &&
866 DM_EVENT_ENABLED(vp
->v_vfsp
, xip
, DM_EVENT_NOSPACE
) &&
867 !(ioflags
& IO_INVIS
)) {
869 xfs_rwunlock(bdp
, locktype
);
870 error
= XFS_SEND_NAMESP(xip
->i_mount
, DM_EVENT_NOSPACE
, vp
,
871 DM_RIGHT_NULL
, vp
, DM_RIGHT_NULL
, NULL
, NULL
,
872 0, 0, 0); /* Delay flag intentionally unused */
874 goto out_unlock_isem
;
875 xfs_rwlock(bdp
, locktype
);
876 pos
= xip
->i_d
.di_size
;
881 if (*offset
> xip
->i_d
.di_size
) {
882 xfs_ilock(xip
, XFS_ILOCK_EXCL
);
883 if (*offset
> xip
->i_d
.di_size
) {
884 xip
->i_d
.di_size
= *offset
;
885 i_size_write(inode
, *offset
);
886 xip
->i_update_core
= 1;
887 xip
->i_update_size
= 1;
889 xfs_iunlock(xip
, XFS_ILOCK_EXCL
);
894 goto out_unlock_internal
;
896 XFS_STATS_ADD(xs_write_bytes
, ret
);
898 /* Handle various SYNC-type writes */
899 if ((file
->f_flags
& O_SYNC
) || IS_SYNC(inode
)) {
901 * If we're treating this as O_DSYNC and we have not updated the
902 * size, force the log.
904 if (!(mp
->m_flags
& XFS_MOUNT_OSYNCISOSYNC
) &&
905 !(xip
->i_update_size
)) {
906 xfs_inode_log_item_t
*iip
= xip
->i_itemp
;
909 * If an allocation transaction occurred
910 * without extending the size, then we have to force
911 * the log up the proper point to ensure that the
912 * allocation is permanent. We can't count on
913 * the fact that buffered writes lock out direct I/O
914 * writes - the direct I/O write could have extended
915 * the size nontransactionally, then finished before
916 * we started. xfs_write_file will think that the file
917 * didn't grow but the update isn't safe unless the
918 * size change is logged.
920 * Force the log if we've committed a transaction
921 * against the inode or if someone else has and
922 * the commit record hasn't gone to disk (e.g.
923 * the inode is pinned). This guarantees that
924 * all changes affecting the inode are permanent
927 if (iip
&& iip
->ili_last_lsn
) {
928 xfs_log_force(mp
, iip
->ili_last_lsn
,
929 XFS_LOG_FORCE
| XFS_LOG_SYNC
);
930 } else if (xfs_ipincount(xip
) > 0) {
931 xfs_log_force(mp
, (xfs_lsn_t
)0,
932 XFS_LOG_FORCE
| XFS_LOG_SYNC
);
939 * O_SYNC or O_DSYNC _with_ a size update are handled
942 * If the write was synchronous then we need to make
943 * sure that the inode modification time is permanent.
944 * We'll have updated the timestamp above, so here
945 * we use a synchronous transaction to log the inode.
946 * It's not fast, but it's necessary.
948 * If this a dsync write and the size got changed
949 * non-transactionally, then we need to ensure that
950 * the size change gets logged in a synchronous
954 tp
= xfs_trans_alloc(mp
, XFS_TRANS_WRITE_SYNC
);
955 if ((error
= xfs_trans_reserve(tp
, 0,
956 XFS_SWRITE_LOG_RES(mp
),
958 /* Transaction reserve failed */
959 xfs_trans_cancel(tp
, 0);
961 /* Transaction reserve successful */
962 xfs_ilock(xip
, XFS_ILOCK_EXCL
);
963 xfs_trans_ijoin(tp
, xip
, XFS_ILOCK_EXCL
);
964 xfs_trans_ihold(tp
, xip
);
965 xfs_trans_log_inode(tp
, xip
, XFS_ILOG_CORE
);
966 xfs_trans_set_sync(tp
);
967 error
= xfs_trans_commit(tp
, 0, NULL
);
968 xfs_iunlock(xip
, XFS_ILOCK_EXCL
);
971 goto out_unlock_internal
;
974 xfs_rwunlock(bdp
, locktype
);
978 error
= sync_page_range(inode
, mapping
, pos
, ret
);
985 xfs_rwunlock(bdp
, locktype
);
993 * All xfs metadata buffers except log state machine buffers
994 * get this attached as their b_bdstrat callback function.
995 * This is so that we can catch a buffer
996 * after prematurely unpinning it to forcibly shutdown the filesystem.
999 xfs_bdstrat_cb(struct xfs_buf
*bp
)
1003 mp
= XFS_BUF_FSPRIVATE3(bp
, xfs_mount_t
*);
1004 if (!XFS_FORCED_SHUTDOWN(mp
)) {
1005 pagebuf_iorequest(bp
);
1008 xfs_buftrace("XFS__BDSTRAT IOERROR", bp
);
1010 * Metadata write that didn't get logged but
1011 * written delayed anyway. These aren't associated
1012 * with a transaction, and can be ignored.
1014 if (XFS_BUF_IODONE_FUNC(bp
) == NULL
&&
1015 (XFS_BUF_ISREAD(bp
)) == 0)
1016 return (xfs_bioerror_relse(bp
));
1018 return (xfs_bioerror(bp
));
1024 xfs_bmap(bhv_desc_t
*bdp
,
1028 xfs_iomap_t
*iomapp
,
1031 xfs_inode_t
*ip
= XFS_BHVTOI(bdp
);
1032 xfs_iocore_t
*io
= &ip
->i_iocore
;
1034 ASSERT((ip
->i_d
.di_mode
& S_IFMT
) == S_IFREG
);
1035 ASSERT(((ip
->i_d
.di_flags
& XFS_DIFLAG_REALTIME
) != 0) ==
1036 ((ip
->i_iocore
.io_flags
& XFS_IOCORE_RT
) != 0));
1038 return xfs_iomap(io
, offset
, count
, flags
, iomapp
, niomaps
);
1042 * Wrapper around bdstrat so that we can stop data
1043 * from going to disk in case we are shutting down the filesystem.
1044 * Typically user data goes thru this path; one of the exceptions
1045 * is the superblock.
1049 struct xfs_mount
*mp
,
1053 if (!XFS_FORCED_SHUTDOWN(mp
)) {
1054 /* Grio redirection would go here
1055 * if (XFS_BUF_IS_GRIO(bp)) {
1058 pagebuf_iorequest(bp
);
1062 xfs_buftrace("XFSBDSTRAT IOERROR", bp
);
1063 return (xfs_bioerror_relse(bp
));
1067 * If the underlying (data/log/rt) device is readonly, there are some
1068 * operations that cannot proceed.
1071 xfs_dev_is_read_only(
1075 if (xfs_readonly_buftarg(mp
->m_ddev_targp
) ||
1076 xfs_readonly_buftarg(mp
->m_logdev_targp
) ||
1077 (mp
->m_rtdev_targp
&& xfs_readonly_buftarg(mp
->m_rtdev_targp
))) {
1079 "XFS: %s required on read-only device.", message
);
1081 "XFS: write access unavailable, cannot proceed.");