2 * Copyright (c) 2000-2003,2005 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
23 #include "xfs_trans.h"
28 #include "xfs_alloc.h"
29 #include "xfs_dmapi.h"
30 #include "xfs_quota.h"
31 #include "xfs_mount.h"
32 #include "xfs_bmap_btree.h"
33 #include "xfs_alloc_btree.h"
34 #include "xfs_ialloc_btree.h"
35 #include "xfs_dir_sf.h"
36 #include "xfs_dir2_sf.h"
37 #include "xfs_attr_sf.h"
38 #include "xfs_dinode.h"
39 #include "xfs_inode.h"
41 #include "xfs_btree.h"
42 #include "xfs_ialloc.h"
43 #include "xfs_rtalloc.h"
44 #include "xfs_error.h"
45 #include "xfs_itable.h"
51 #include "xfs_inode_item.h"
52 #include "xfs_buf_item.h"
53 #include "xfs_utils.h"
54 #include "xfs_iomap.h"
56 #include <linux/capability.h>
57 #include <linux/writeback.h>
60 #if defined(XFS_RW_TRACE)
70 xfs_inode_t
*ip
= XFS_IO_INODE(io
);
72 if (ip
->i_rwtrace
== NULL
)
74 ktrace_enter(ip
->i_rwtrace
,
75 (void *)(unsigned long)tag
,
77 (void *)((unsigned long)((ip
->i_d
.di_size
>> 32) & 0xffffffff)),
78 (void *)((unsigned long)(ip
->i_d
.di_size
& 0xffffffff)),
80 (void *)((unsigned long)segs
),
81 (void *)((unsigned long)((offset
>> 32) & 0xffffffff)),
82 (void *)((unsigned long)(offset
& 0xffffffff)),
83 (void *)((unsigned long)ioflags
),
84 (void *)((unsigned long)((io
->io_new_size
>> 32) & 0xffffffff)),
85 (void *)((unsigned long)(io
->io_new_size
& 0xffffffff)),
86 (void *)((unsigned long)current_pid()),
94 xfs_inval_cached_trace(
101 xfs_inode_t
*ip
= XFS_IO_INODE(io
);
103 if (ip
->i_rwtrace
== NULL
)
105 ktrace_enter(ip
->i_rwtrace
,
106 (void *)(__psint_t
)XFS_INVAL_CACHED
,
108 (void *)((unsigned long)((offset
>> 32) & 0xffffffff)),
109 (void *)((unsigned long)(offset
& 0xffffffff)),
110 (void *)((unsigned long)((len
>> 32) & 0xffffffff)),
111 (void *)((unsigned long)(len
& 0xffffffff)),
112 (void *)((unsigned long)((first
>> 32) & 0xffffffff)),
113 (void *)((unsigned long)(first
& 0xffffffff)),
114 (void *)((unsigned long)((last
>> 32) & 0xffffffff)),
115 (void *)((unsigned long)(last
& 0xffffffff)),
116 (void *)((unsigned long)current_pid()),
128 * xfs_iozero clears the specified range of buffer supplied,
129 * and marks all the affected blocks as valid and modified. If
130 * an affected block is not allocated, it will be allocated. If
131 * an affected block is not completely overwritten, and is not
132 * valid before the operation, it will be read from disk before
133 * being partially zeroed.
137 struct inode
*ip
, /* inode */
138 loff_t pos
, /* offset in file */
139 size_t count
, /* size of data to zero */
140 loff_t end_size
) /* max file size to set */
144 struct address_space
*mapping
;
148 mapping
= ip
->i_mapping
;
150 unsigned long index
, offset
;
152 offset
= (pos
& (PAGE_CACHE_SIZE
-1)); /* Within page */
153 index
= pos
>> PAGE_CACHE_SHIFT
;
154 bytes
= PAGE_CACHE_SIZE
- offset
;
159 page
= grab_cache_page(mapping
, index
);
164 status
= mapping
->a_ops
->prepare_write(NULL
, page
, offset
,
170 memset((void *) (kaddr
+ offset
), 0, bytes
);
171 flush_dcache_page(page
);
172 status
= mapping
->a_ops
->commit_write(NULL
, page
, offset
,
177 if (pos
> i_size_read(ip
))
178 i_size_write(ip
, pos
< end_size
? pos
: end_size
);
184 page_cache_release(page
);
192 ssize_t
/* bytes read, or (-) error */
196 const struct iovec
*iovp
,
202 struct file
*file
= iocb
->ki_filp
;
203 struct inode
*inode
= file
->f_mapping
->host
;
212 ip
= XFS_BHVTOI(bdp
);
213 vp
= BHV_TO_VNODE(bdp
);
216 XFS_STATS_INC(xs_read_calls
);
218 /* START copy & waste from filemap.c */
219 for (seg
= 0; seg
< segs
; seg
++) {
220 const struct iovec
*iv
= &iovp
[seg
];
223 * If any segment has a negative length, or the cumulative
224 * length ever wraps negative then return -EINVAL.
227 if (unlikely((ssize_t
)(size
|iv
->iov_len
) < 0))
228 return XFS_ERROR(-EINVAL
);
230 /* END copy & waste from filemap.c */
232 if (unlikely(ioflags
& IO_ISDIRECT
)) {
233 xfs_buftarg_t
*target
=
234 (ip
->i_d
.di_flags
& XFS_DIFLAG_REALTIME
) ?
235 mp
->m_rtdev_targp
: mp
->m_ddev_targp
;
236 if ((*offset
& target
->bt_smask
) ||
237 (size
& target
->bt_smask
)) {
238 if (*offset
== ip
->i_d
.di_size
) {
241 return -XFS_ERROR(EINVAL
);
245 n
= XFS_MAXIOFFSET(mp
) - *offset
;
246 if ((n
<= 0) || (size
== 0))
252 if (XFS_FORCED_SHUTDOWN(mp
))
255 if (unlikely(ioflags
& IO_ISDIRECT
))
256 mutex_lock(&inode
->i_mutex
);
257 xfs_ilock(ip
, XFS_IOLOCK_SHARED
);
259 if (DM_EVENT_ENABLED(vp
->v_vfsp
, ip
, DM_EVENT_READ
) &&
260 !(ioflags
& IO_INVIS
)) {
261 vrwlock_t locktype
= VRWLOCK_READ
;
262 int dmflags
= FILP_DELAY_FLAG(file
) | DM_SEM_FLAG_RD(ioflags
);
264 ret
= -XFS_SEND_DATA(mp
, DM_EVENT_READ
,
265 BHV_TO_VNODE(bdp
), *offset
, size
,
268 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
273 if (unlikely((ioflags
& IO_ISDIRECT
) && VN_CACHED(vp
)))
274 VOP_FLUSHINVAL_PAGES(vp
, ctooff(offtoct(*offset
)),
275 -1, FI_REMAPF_LOCKED
);
277 xfs_rw_enter_trace(XFS_READ_ENTER
, &ip
->i_iocore
,
278 (void *)iovp
, segs
, *offset
, ioflags
);
279 ret
= __generic_file_aio_read(iocb
, iovp
, segs
, offset
);
280 if (ret
== -EIOCBQUEUED
&& !(ioflags
& IO_ISAIO
))
281 ret
= wait_on_sync_kiocb(iocb
);
283 XFS_STATS_ADD(xs_read_bytes
, ret
);
285 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
288 if (unlikely(ioflags
& IO_ISDIRECT
))
289 mutex_unlock(&inode
->i_mutex
);
304 xfs_inode_t
*ip
= XFS_BHVTOI(bdp
);
305 xfs_mount_t
*mp
= ip
->i_mount
;
308 XFS_STATS_INC(xs_read_calls
);
309 if (XFS_FORCED_SHUTDOWN(mp
))
312 xfs_ilock(ip
, XFS_IOLOCK_SHARED
);
314 if (DM_EVENT_ENABLED(BHV_TO_VNODE(bdp
)->v_vfsp
, ip
, DM_EVENT_READ
) &&
315 (!(ioflags
& IO_INVIS
))) {
316 vrwlock_t locktype
= VRWLOCK_READ
;
319 error
= XFS_SEND_DATA(mp
, DM_EVENT_READ
, BHV_TO_VNODE(bdp
),
321 FILP_DELAY_FLAG(filp
), &locktype
);
323 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
327 xfs_rw_enter_trace(XFS_SENDFILE_ENTER
, &ip
->i_iocore
,
328 (void *)(unsigned long)target
, count
, *offset
, ioflags
);
329 ret
= generic_file_sendfile(filp
, offset
, count
, actor
, target
);
331 XFS_STATS_ADD(xs_read_bytes
, ret
);
333 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
342 struct pipe_inode_info
*pipe
,
348 xfs_inode_t
*ip
= XFS_BHVTOI(bdp
);
349 xfs_mount_t
*mp
= ip
->i_mount
;
352 XFS_STATS_INC(xs_read_calls
);
353 if (XFS_FORCED_SHUTDOWN(ip
->i_mount
))
356 xfs_ilock(ip
, XFS_IOLOCK_SHARED
);
358 if (DM_EVENT_ENABLED(BHV_TO_VNODE(bdp
)->v_vfsp
, ip
, DM_EVENT_READ
) &&
359 (!(ioflags
& IO_INVIS
))) {
360 vrwlock_t locktype
= VRWLOCK_READ
;
363 error
= XFS_SEND_DATA(mp
, DM_EVENT_READ
, BHV_TO_VNODE(bdp
),
365 FILP_DELAY_FLAG(infilp
), &locktype
);
367 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
371 xfs_rw_enter_trace(XFS_SPLICE_READ_ENTER
, &ip
->i_iocore
,
372 pipe
, count
, *ppos
, ioflags
);
373 ret
= generic_file_splice_read(infilp
, ppos
, pipe
, count
, flags
);
375 XFS_STATS_ADD(xs_read_bytes
, ret
);
377 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
384 struct pipe_inode_info
*pipe
,
385 struct file
*outfilp
,
392 xfs_inode_t
*ip
= XFS_BHVTOI(bdp
);
393 xfs_mount_t
*mp
= ip
->i_mount
;
396 XFS_STATS_INC(xs_write_calls
);
397 if (XFS_FORCED_SHUTDOWN(ip
->i_mount
))
400 xfs_ilock(ip
, XFS_IOLOCK_EXCL
);
402 if (DM_EVENT_ENABLED(BHV_TO_VNODE(bdp
)->v_vfsp
, ip
, DM_EVENT_WRITE
) &&
403 (!(ioflags
& IO_INVIS
))) {
404 vrwlock_t locktype
= VRWLOCK_WRITE
;
407 error
= XFS_SEND_DATA(mp
, DM_EVENT_WRITE
, BHV_TO_VNODE(bdp
),
409 FILP_DELAY_FLAG(outfilp
), &locktype
);
411 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
415 xfs_rw_enter_trace(XFS_SPLICE_WRITE_ENTER
, &ip
->i_iocore
,
416 pipe
, count
, *ppos
, ioflags
);
417 ret
= generic_file_splice_write(pipe
, outfilp
, ppos
, count
, flags
);
419 XFS_STATS_ADD(xs_write_bytes
, ret
);
421 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
426 * This routine is called to handle zeroing any space in the last
427 * block of the file that is beyond the EOF. We do this since the
428 * size is being increased without writing anything to that block
429 * and we don't want anyone to read the garbage on the disk.
431 STATIC
int /* error (positive) */
436 xfs_fsize_t end_size
)
438 xfs_fileoff_t last_fsb
;
439 xfs_mount_t
*mp
= io
->io_mount
;
444 xfs_bmbt_irec_t imap
;
447 ASSERT(ismrlocked(io
->io_lock
, MR_UPDATE
) != 0);
449 zero_offset
= XFS_B_FSB_OFFSET(mp
, isize
);
450 if (zero_offset
== 0) {
452 * There are no extra bytes in the last block on disk to
458 last_fsb
= XFS_B_TO_FSBT(mp
, isize
);
460 error
= XFS_BMAPI(mp
, NULL
, io
, last_fsb
, 1, 0, NULL
, 0, &imap
,
467 * If the block underlying isize is just a hole, then there
468 * is nothing to zero.
470 if (imap
.br_startblock
== HOLESTARTBLOCK
) {
474 * Zero the part of the last block beyond the EOF, and write it
475 * out sync. We need to drop the ilock while we do this so we
476 * don't deadlock when the buffer cache calls back to us.
478 XFS_IUNLOCK(mp
, io
, XFS_ILOCK_EXCL
| XFS_EXTSIZE_RD
);
480 loff
= XFS_FSB_TO_B(mp
, last_fsb
);
481 zero_len
= mp
->m_sb
.sb_blocksize
- zero_offset
;
482 error
= xfs_iozero(ip
, loff
+ zero_offset
, zero_len
, end_size
);
484 XFS_ILOCK(mp
, io
, XFS_ILOCK_EXCL
|XFS_EXTSIZE_RD
);
490 * Zero any on disk space between the current EOF and the new,
491 * larger EOF. This handles the normal case of zeroing the remainder
492 * of the last block in the file and the unusual case of zeroing blocks
493 * out beyond the size of the file. This second case only happens
494 * with fixed size extents and when the system crashes before the inode
495 * size was updated but after blocks were allocated. If fill is set,
496 * then any holes in the range are filled and zeroed. If not, the holes
497 * are left alone as holes.
500 int /* error (positive) */
504 xfs_off_t offset
, /* starting I/O offset */
505 xfs_fsize_t isize
, /* current inode size */
506 xfs_fsize_t end_size
) /* terminal inode size */
508 struct inode
*ip
= vn_to_inode(vp
);
509 xfs_fileoff_t start_zero_fsb
;
510 xfs_fileoff_t end_zero_fsb
;
511 xfs_fileoff_t zero_count_fsb
;
512 xfs_fileoff_t last_fsb
;
513 xfs_extlen_t buf_len_fsb
;
514 xfs_mount_t
*mp
= io
->io_mount
;
517 xfs_bmbt_irec_t imap
;
519 ASSERT(ismrlocked(io
->io_lock
, MR_UPDATE
));
520 ASSERT(ismrlocked(io
->io_iolock
, MR_UPDATE
));
521 ASSERT(offset
> isize
);
524 * First handle zeroing the block on which isize resides.
525 * We only zero a part of that block so it is handled specially.
527 error
= xfs_zero_last_block(ip
, io
, isize
, end_size
);
529 ASSERT(ismrlocked(io
->io_lock
, MR_UPDATE
));
530 ASSERT(ismrlocked(io
->io_iolock
, MR_UPDATE
));
535 * Calculate the range between the new size and the old
536 * where blocks needing to be zeroed may exist. To get the
537 * block where the last byte in the file currently resides,
538 * we need to subtract one from the size and truncate back
539 * to a block boundary. We subtract 1 in case the size is
540 * exactly on a block boundary.
542 last_fsb
= isize
? XFS_B_TO_FSBT(mp
, isize
- 1) : (xfs_fileoff_t
)-1;
543 start_zero_fsb
= XFS_B_TO_FSB(mp
, (xfs_ufsize_t
)isize
);
544 end_zero_fsb
= XFS_B_TO_FSBT(mp
, offset
- 1);
545 ASSERT((xfs_sfiloff_t
)last_fsb
< (xfs_sfiloff_t
)start_zero_fsb
);
546 if (last_fsb
== end_zero_fsb
) {
548 * The size was only incremented on its last block.
549 * We took care of that above, so just return.
554 ASSERT(start_zero_fsb
<= end_zero_fsb
);
555 while (start_zero_fsb
<= end_zero_fsb
) {
557 zero_count_fsb
= end_zero_fsb
- start_zero_fsb
+ 1;
558 error
= XFS_BMAPI(mp
, NULL
, io
, start_zero_fsb
, zero_count_fsb
,
559 0, NULL
, 0, &imap
, &nimaps
, NULL
);
561 ASSERT(ismrlocked(io
->io_lock
, MR_UPDATE
));
562 ASSERT(ismrlocked(io
->io_iolock
, MR_UPDATE
));
567 if (imap
.br_state
== XFS_EXT_UNWRITTEN
||
568 imap
.br_startblock
== HOLESTARTBLOCK
) {
570 * This loop handles initializing pages that were
571 * partially initialized by the code below this
572 * loop. It basically zeroes the part of the page
573 * that sits on a hole and sets the page as P_HOLE
574 * and calls remapf if it is a mapped file.
576 start_zero_fsb
= imap
.br_startoff
+ imap
.br_blockcount
;
577 ASSERT(start_zero_fsb
<= (end_zero_fsb
+ 1));
582 * There are blocks in the range requested.
583 * Zero them a single write at a time. We actually
584 * don't zero the entire range returned if it is
585 * too big and simply loop around to get the rest.
586 * That is not the most efficient thing to do, but it
587 * is simple and this path should not be exercised often.
589 buf_len_fsb
= XFS_FILBLKS_MIN(imap
.br_blockcount
,
590 mp
->m_writeio_blocks
<< 8);
592 * Drop the inode lock while we're doing the I/O.
593 * We'll still have the iolock to protect us.
595 XFS_IUNLOCK(mp
, io
, XFS_ILOCK_EXCL
|XFS_EXTSIZE_RD
);
597 error
= xfs_iozero(ip
,
598 XFS_FSB_TO_B(mp
, start_zero_fsb
),
599 XFS_FSB_TO_B(mp
, buf_len_fsb
),
606 start_zero_fsb
= imap
.br_startoff
+ buf_len_fsb
;
607 ASSERT(start_zero_fsb
<= (end_zero_fsb
+ 1));
609 XFS_ILOCK(mp
, io
, XFS_ILOCK_EXCL
|XFS_EXTSIZE_RD
);
616 XFS_ILOCK(mp
, io
, XFS_ILOCK_EXCL
|XFS_EXTSIZE_RD
);
621 ssize_t
/* bytes written, or (-) error */
625 const struct iovec
*iovp
,
631 struct file
*file
= iocb
->ki_filp
;
632 struct address_space
*mapping
= file
->f_mapping
;
633 struct inode
*inode
= mapping
->host
;
634 unsigned long segs
= nsegs
;
637 ssize_t ret
= 0, error
= 0;
638 xfs_fsize_t isize
, new_size
;
645 size_t ocount
= 0, count
;
647 int need_i_mutex
= 1, need_flush
= 0;
649 XFS_STATS_INC(xs_write_calls
);
651 vp
= BHV_TO_VNODE(bdp
);
652 xip
= XFS_BHVTOI(bdp
);
654 for (seg
= 0; seg
< segs
; seg
++) {
655 const struct iovec
*iv
= &iovp
[seg
];
658 * If any segment has a negative length, or the cumulative
659 * length ever wraps negative then return -EINVAL.
661 ocount
+= iv
->iov_len
;
662 if (unlikely((ssize_t
)(ocount
|iv
->iov_len
) < 0))
664 if (access_ok(VERIFY_READ
, iv
->iov_base
, iv
->iov_len
))
669 ocount
-= iv
->iov_len
; /* This segment is no good */
682 if (XFS_FORCED_SHUTDOWN(mp
))
685 fs_check_frozen(vp
->v_vfsp
, SB_FREEZE_WRITE
);
687 if (ioflags
& IO_ISDIRECT
) {
688 xfs_buftarg_t
*target
=
689 (xip
->i_d
.di_flags
& XFS_DIFLAG_REALTIME
) ?
690 mp
->m_rtdev_targp
: mp
->m_ddev_targp
;
692 if ((pos
& target
->bt_smask
) || (count
& target
->bt_smask
))
693 return XFS_ERROR(-EINVAL
);
695 if (!VN_CACHED(vp
) && pos
< i_size_read(inode
))
704 iolock
= XFS_IOLOCK_EXCL
;
705 locktype
= VRWLOCK_WRITE
;
707 mutex_lock(&inode
->i_mutex
);
709 iolock
= XFS_IOLOCK_SHARED
;
710 locktype
= VRWLOCK_WRITE_DIRECT
;
713 xfs_ilock(xip
, XFS_ILOCK_EXCL
|iolock
);
715 isize
= i_size_read(inode
);
717 if (file
->f_flags
& O_APPEND
)
721 error
= -generic_write_checks(file
, &pos
, &count
,
722 S_ISBLK(inode
->i_mode
));
724 xfs_iunlock(xip
, XFS_ILOCK_EXCL
|iolock
);
725 goto out_unlock_mutex
;
728 new_size
= pos
+ count
;
729 if (new_size
> isize
)
730 io
->io_new_size
= new_size
;
732 if ((DM_EVENT_ENABLED(vp
->v_vfsp
, xip
, DM_EVENT_WRITE
) &&
733 !(ioflags
& IO_INVIS
) && !eventsent
)) {
734 loff_t savedsize
= pos
;
735 int dmflags
= FILP_DELAY_FLAG(file
);
738 dmflags
|= DM_FLAGS_IMUX
;
740 xfs_iunlock(xip
, XFS_ILOCK_EXCL
);
741 error
= XFS_SEND_DATA(xip
->i_mount
, DM_EVENT_WRITE
, vp
,
745 xfs_iunlock(xip
, iolock
);
746 goto out_unlock_mutex
;
748 xfs_ilock(xip
, XFS_ILOCK_EXCL
);
752 * The iolock was dropped and reacquired in XFS_SEND_DATA
753 * so we have to recheck the size when appending.
754 * We will only "goto start;" once, since having sent the
755 * event prevents another call to XFS_SEND_DATA, which is
756 * what allows the size to change in the first place.
758 if ((file
->f_flags
& O_APPEND
) && savedsize
!= isize
) {
759 pos
= isize
= xip
->i_d
.di_size
;
764 if (likely(!(ioflags
& IO_INVIS
))) {
765 file_update_time(file
);
766 xfs_ichgtime_fast(xip
, inode
,
767 XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
771 * If the offset is beyond the size of the file, we have a couple
772 * of things to do. First, if there is already space allocated
773 * we need to either create holes or zero the disk or ...
775 * If there is a page where the previous size lands, we need
776 * to zero it out up to the new size.
780 error
= xfs_zero_eof(BHV_TO_VNODE(bdp
), io
, pos
,
783 xfs_iunlock(xip
, XFS_ILOCK_EXCL
|iolock
);
784 goto out_unlock_mutex
;
787 xfs_iunlock(xip
, XFS_ILOCK_EXCL
);
790 * If we're writing the file then make sure to clear the
791 * setuid and setgid bits if the process is not being run
792 * by root. This keeps people from modifying setuid and
796 if (((xip
->i_d
.di_mode
& S_ISUID
) ||
797 ((xip
->i_d
.di_mode
& (S_ISGID
| S_IXGRP
)) ==
798 (S_ISGID
| S_IXGRP
))) &&
799 !capable(CAP_FSETID
)) {
800 error
= xfs_write_clear_setuid(xip
);
802 error
= -remove_suid(file
->f_dentry
);
803 if (unlikely(error
)) {
804 xfs_iunlock(xip
, iolock
);
805 goto out_unlock_mutex
;
810 /* We can write back this queue in page reclaim */
811 current
->backing_dev_info
= mapping
->backing_dev_info
;
813 if ((ioflags
& IO_ISDIRECT
)) {
815 xfs_inval_cached_trace(io
, pos
, -1,
816 ctooff(offtoct(pos
)), -1);
817 VOP_FLUSHINVAL_PAGES(vp
, ctooff(offtoct(pos
)),
818 -1, FI_REMAPF_LOCKED
);
822 /* demote the lock now the cached pages are gone */
823 XFS_ILOCK_DEMOTE(mp
, io
, XFS_IOLOCK_EXCL
);
824 mutex_unlock(&inode
->i_mutex
);
826 iolock
= XFS_IOLOCK_SHARED
;
827 locktype
= VRWLOCK_WRITE_DIRECT
;
831 xfs_rw_enter_trace(XFS_DIOWR_ENTER
, io
, (void *)iovp
, segs
,
833 ret
= generic_file_direct_write(iocb
, iovp
,
834 &segs
, pos
, offset
, count
, ocount
);
837 * direct-io write to a hole: fall through to buffered I/O
838 * for completing the rest of the request.
840 if (ret
>= 0 && ret
!= count
) {
841 XFS_STATS_ADD(xs_write_bytes
, ret
);
847 ioflags
&= ~IO_ISDIRECT
;
848 xfs_iunlock(xip
, iolock
);
852 xfs_rw_enter_trace(XFS_WRITE_ENTER
, io
, (void *)iovp
, segs
,
854 ret
= generic_file_buffered_write(iocb
, iovp
, segs
,
855 pos
, offset
, count
, ret
);
858 current
->backing_dev_info
= NULL
;
860 if (ret
== -EIOCBQUEUED
&& !(ioflags
& IO_ISAIO
))
861 ret
= wait_on_sync_kiocb(iocb
);
863 if ((ret
== -ENOSPC
) &&
864 DM_EVENT_ENABLED(vp
->v_vfsp
, xip
, DM_EVENT_NOSPACE
) &&
865 !(ioflags
& IO_INVIS
)) {
867 xfs_rwunlock(bdp
, locktype
);
869 mutex_unlock(&inode
->i_mutex
);
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 */
876 mutex_lock(&inode
->i_mutex
);
877 xfs_rwlock(bdp
, locktype
);
878 pos
= xip
->i_d
.di_size
;
883 isize
= i_size_read(inode
);
884 if (unlikely(ret
< 0 && ret
!= -EFAULT
&& *offset
> isize
))
887 if (*offset
> xip
->i_d
.di_size
) {
888 xfs_ilock(xip
, XFS_ILOCK_EXCL
);
889 if (*offset
> xip
->i_d
.di_size
) {
890 xip
->i_d
.di_size
= *offset
;
891 i_size_write(inode
, *offset
);
892 xip
->i_update_core
= 1;
893 xip
->i_update_size
= 1;
895 xfs_iunlock(xip
, XFS_ILOCK_EXCL
);
900 goto out_unlock_internal
;
902 XFS_STATS_ADD(xs_write_bytes
, ret
);
904 /* Handle various SYNC-type writes */
905 if ((file
->f_flags
& O_SYNC
) || IS_SYNC(inode
)) {
907 * If we're treating this as O_DSYNC and we have not updated the
908 * size, force the log.
910 if (!(mp
->m_flags
& XFS_MOUNT_OSYNCISOSYNC
) &&
911 !(xip
->i_update_size
)) {
912 xfs_inode_log_item_t
*iip
= xip
->i_itemp
;
915 * If an allocation transaction occurred
916 * without extending the size, then we have to force
917 * the log up the proper point to ensure that the
918 * allocation is permanent. We can't count on
919 * the fact that buffered writes lock out direct I/O
920 * writes - the direct I/O write could have extended
921 * the size nontransactionally, then finished before
922 * we started. xfs_write_file will think that the file
923 * didn't grow but the update isn't safe unless the
924 * size change is logged.
926 * Force the log if we've committed a transaction
927 * against the inode or if someone else has and
928 * the commit record hasn't gone to disk (e.g.
929 * the inode is pinned). This guarantees that
930 * all changes affecting the inode are permanent
933 if (iip
&& iip
->ili_last_lsn
) {
934 xfs_log_force(mp
, iip
->ili_last_lsn
,
935 XFS_LOG_FORCE
| XFS_LOG_SYNC
);
936 } else if (xfs_ipincount(xip
) > 0) {
937 xfs_log_force(mp
, (xfs_lsn_t
)0,
938 XFS_LOG_FORCE
| XFS_LOG_SYNC
);
945 * O_SYNC or O_DSYNC _with_ a size update are handled
948 * If the write was synchronous then we need to make
949 * sure that the inode modification time is permanent.
950 * We'll have updated the timestamp above, so here
951 * we use a synchronous transaction to log the inode.
952 * It's not fast, but it's necessary.
954 * If this a dsync write and the size got changed
955 * non-transactionally, then we need to ensure that
956 * the size change gets logged in a synchronous
960 tp
= xfs_trans_alloc(mp
, XFS_TRANS_WRITE_SYNC
);
961 if ((error
= xfs_trans_reserve(tp
, 0,
962 XFS_SWRITE_LOG_RES(mp
),
964 /* Transaction reserve failed */
965 xfs_trans_cancel(tp
, 0);
967 /* Transaction reserve successful */
968 xfs_ilock(xip
, XFS_ILOCK_EXCL
);
969 xfs_trans_ijoin(tp
, xip
, XFS_ILOCK_EXCL
);
970 xfs_trans_ihold(tp
, xip
);
971 xfs_trans_log_inode(tp
, xip
, XFS_ILOG_CORE
);
972 xfs_trans_set_sync(tp
);
973 error
= xfs_trans_commit(tp
, 0, NULL
);
974 xfs_iunlock(xip
, XFS_ILOCK_EXCL
);
977 goto out_unlock_internal
;
980 xfs_rwunlock(bdp
, locktype
);
982 mutex_unlock(&inode
->i_mutex
);
984 error
= sync_page_range(inode
, mapping
, pos
, ret
);
991 xfs_rwunlock(bdp
, locktype
);
994 mutex_unlock(&inode
->i_mutex
);
1000 * All xfs metadata buffers except log state machine buffers
1001 * get this attached as their b_bdstrat callback function.
1002 * This is so that we can catch a buffer
1003 * after prematurely unpinning it to forcibly shutdown the filesystem.
1006 xfs_bdstrat_cb(struct xfs_buf
*bp
)
1010 mp
= XFS_BUF_FSPRIVATE3(bp
, xfs_mount_t
*);
1011 if (!XFS_FORCED_SHUTDOWN(mp
)) {
1012 xfs_buf_iorequest(bp
);
1015 xfs_buftrace("XFS__BDSTRAT IOERROR", bp
);
1017 * Metadata write that didn't get logged but
1018 * written delayed anyway. These aren't associated
1019 * with a transaction, and can be ignored.
1021 if (XFS_BUF_IODONE_FUNC(bp
) == NULL
&&
1022 (XFS_BUF_ISREAD(bp
)) == 0)
1023 return (xfs_bioerror_relse(bp
));
1025 return (xfs_bioerror(bp
));
1031 xfs_bmap(bhv_desc_t
*bdp
,
1035 xfs_iomap_t
*iomapp
,
1038 xfs_inode_t
*ip
= XFS_BHVTOI(bdp
);
1039 xfs_iocore_t
*io
= &ip
->i_iocore
;
1041 ASSERT((ip
->i_d
.di_mode
& S_IFMT
) == S_IFREG
);
1042 ASSERT(((ip
->i_d
.di_flags
& XFS_DIFLAG_REALTIME
) != 0) ==
1043 ((ip
->i_iocore
.io_flags
& XFS_IOCORE_RT
) != 0));
1045 return xfs_iomap(io
, offset
, count
, flags
, iomapp
, niomaps
);
1049 * Wrapper around bdstrat so that we can stop data
1050 * from going to disk in case we are shutting down the filesystem.
1051 * Typically user data goes thru this path; one of the exceptions
1052 * is the superblock.
1056 struct xfs_mount
*mp
,
1060 if (!XFS_FORCED_SHUTDOWN(mp
)) {
1061 /* Grio redirection would go here
1062 * if (XFS_BUF_IS_GRIO(bp)) {
1065 xfs_buf_iorequest(bp
);
1069 xfs_buftrace("XFSBDSTRAT IOERROR", bp
);
1070 return (xfs_bioerror_relse(bp
));
1074 * If the underlying (data/log/rt) device is readonly, there are some
1075 * operations that cannot proceed.
1078 xfs_dev_is_read_only(
1082 if (xfs_readonly_buftarg(mp
->m_ddev_targp
) ||
1083 xfs_readonly_buftarg(mp
->m_logdev_targp
) ||
1084 (mp
->m_rtdev_targp
&& xfs_readonly_buftarg(mp
->m_rtdev_targp
))) {
1086 "XFS: %s required on read-only device.", message
);
1088 "XFS: write access unavailable, cannot proceed.");