2 * Copyright (c) 2000-2005 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
25 #include "xfs_trans.h"
26 #include "xfs_mount.h"
27 #include "xfs_bmap_btree.h"
28 #include "xfs_alloc.h"
29 #include "xfs_dinode.h"
30 #include "xfs_inode.h"
31 #include "xfs_inode_item.h"
33 #include "xfs_error.h"
34 #include "xfs_vnodeops.h"
35 #include "xfs_da_btree.h"
36 #include "xfs_ioctl.h"
37 #include "xfs_trace.h"
39 #include <linux/dcache.h>
41 static const struct vm_operations_struct xfs_file_vm_ops
;
46 * xfs_iozero clears the specified range of buffer supplied,
47 * and marks all the affected blocks as valid and modified. If
48 * an affected block is not allocated, it will be allocated. If
49 * an affected block is not completely overwritten, and is not
50 * valid before the operation, it will be read from disk before
51 * being partially zeroed.
55 struct xfs_inode
*ip
, /* inode */
56 loff_t pos
, /* offset in file */
57 size_t count
) /* size of data to zero */
60 struct address_space
*mapping
;
63 mapping
= VFS_I(ip
)->i_mapping
;
65 unsigned offset
, bytes
;
68 offset
= (pos
& (PAGE_CACHE_SIZE
-1)); /* Within page */
69 bytes
= PAGE_CACHE_SIZE
- offset
;
73 status
= pagecache_write_begin(NULL
, mapping
, pos
, bytes
,
74 AOP_FLAG_UNINTERRUPTIBLE
,
79 zero_user(page
, offset
, bytes
);
81 status
= pagecache_write_end(NULL
, mapping
, pos
, bytes
, bytes
,
83 WARN_ON(status
<= 0); /* can't return less than zero! */
97 struct inode
*inode
= file
->f_mapping
->host
;
98 struct xfs_inode
*ip
= XFS_I(inode
);
103 trace_xfs_file_fsync(ip
);
105 if (XFS_FORCED_SHUTDOWN(ip
->i_mount
))
106 return -XFS_ERROR(EIO
);
108 xfs_iflags_clear(ip
, XFS_ITRUNCATED
);
113 * We always need to make sure that the required inode state is safe on
114 * disk. The inode might be clean but we still might need to force the
115 * log because of committed transactions that haven't hit the disk yet.
116 * Likewise, there could be unflushed non-transactional changes to the
117 * inode core that have to go to disk and this requires us to issue
118 * a synchronous transaction to capture these changes correctly.
120 * This code relies on the assumption that if the i_update_core field
121 * of the inode is clear and the inode is unpinned then it is clean
122 * and no action is required.
124 xfs_ilock(ip
, XFS_ILOCK_SHARED
);
127 * First check if the VFS inode is marked dirty. All the dirtying
128 * of non-transactional updates no goes through mark_inode_dirty*,
129 * which allows us to distinguish beteeen pure timestamp updates
130 * and i_size updates which need to be caught for fdatasync.
131 * After that also theck for the dirty state in the XFS inode, which
132 * might gets cleared when the inode gets written out via the AIL
133 * or xfs_iflush_cluster.
135 if (((inode
->i_state
& I_DIRTY_DATASYNC
) ||
136 ((inode
->i_state
& I_DIRTY_SYNC
) && !datasync
)) &&
139 * Kick off a transaction to log the inode core to get the
140 * updates. The sync transaction will also force the log.
142 xfs_iunlock(ip
, XFS_ILOCK_SHARED
);
143 tp
= xfs_trans_alloc(ip
->i_mount
, XFS_TRANS_FSYNC_TS
);
144 error
= xfs_trans_reserve(tp
, 0,
145 XFS_FSYNC_TS_LOG_RES(ip
->i_mount
), 0, 0, 0);
147 xfs_trans_cancel(tp
, 0);
150 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
153 * Note - it's possible that we might have pushed ourselves out
154 * of the way during trans_reserve which would flush the inode.
155 * But there's no guarantee that the inode buffer has actually
156 * gone out yet (it's delwri). Plus the buffer could be pinned
157 * anyway if it's part of an inode in another recent
158 * transaction. So we play it safe and fire off the
159 * transaction anyway.
161 xfs_trans_ijoin(tp
, ip
);
162 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
163 xfs_trans_set_sync(tp
);
164 error
= _xfs_trans_commit(tp
, 0, &log_flushed
);
166 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
169 * Timestamps/size haven't changed since last inode flush or
170 * inode transaction commit. That means either nothing got
171 * written or a transaction committed which caught the updates.
172 * If the latter happened and the transaction hasn't hit the
173 * disk yet, the inode will be still be pinned. If it is,
176 if (xfs_ipincount(ip
)) {
177 error
= _xfs_log_force_lsn(ip
->i_mount
,
178 ip
->i_itemp
->ili_last_lsn
,
179 XFS_LOG_SYNC
, &log_flushed
);
181 xfs_iunlock(ip
, XFS_ILOCK_SHARED
);
184 if (ip
->i_mount
->m_flags
& XFS_MOUNT_BARRIER
) {
186 * If the log write didn't issue an ordered tag we need
187 * to flush the disk cache for the data device now.
190 xfs_blkdev_issue_flush(ip
->i_mount
->m_ddev_targp
);
193 * If this inode is on the RT dev we need to flush that
196 if (XFS_IS_REALTIME_INODE(ip
))
197 xfs_blkdev_issue_flush(ip
->i_mount
->m_rtdev_targp
);
206 const struct iovec
*iovp
,
207 unsigned long nr_segs
,
210 struct file
*file
= iocb
->ki_filp
;
211 struct inode
*inode
= file
->f_mapping
->host
;
212 struct xfs_inode
*ip
= XFS_I(inode
);
213 struct xfs_mount
*mp
= ip
->i_mount
;
220 XFS_STATS_INC(xs_read_calls
);
222 BUG_ON(iocb
->ki_pos
!= pos
);
224 if (unlikely(file
->f_flags
& O_DIRECT
))
225 ioflags
|= IO_ISDIRECT
;
226 if (file
->f_mode
& FMODE_NOCMTIME
)
229 /* START copy & waste from filemap.c */
230 for (seg
= 0; seg
< nr_segs
; seg
++) {
231 const struct iovec
*iv
= &iovp
[seg
];
234 * If any segment has a negative length, or the cumulative
235 * length ever wraps negative then return -EINVAL.
238 if (unlikely((ssize_t
)(size
|iv
->iov_len
) < 0))
239 return XFS_ERROR(-EINVAL
);
241 /* END copy & waste from filemap.c */
243 if (unlikely(ioflags
& IO_ISDIRECT
)) {
244 xfs_buftarg_t
*target
=
245 XFS_IS_REALTIME_INODE(ip
) ?
246 mp
->m_rtdev_targp
: mp
->m_ddev_targp
;
247 if ((iocb
->ki_pos
& target
->bt_smask
) ||
248 (size
& target
->bt_smask
)) {
249 if (iocb
->ki_pos
== ip
->i_size
)
251 return -XFS_ERROR(EINVAL
);
255 n
= XFS_MAXIOFFSET(mp
) - iocb
->ki_pos
;
256 if (n
<= 0 || size
== 0)
262 if (XFS_FORCED_SHUTDOWN(mp
))
265 if (unlikely(ioflags
& IO_ISDIRECT
))
266 mutex_lock(&inode
->i_mutex
);
267 xfs_ilock(ip
, XFS_IOLOCK_SHARED
);
269 if (unlikely(ioflags
& IO_ISDIRECT
)) {
270 if (inode
->i_mapping
->nrpages
) {
271 ret
= -xfs_flushinval_pages(ip
,
272 (iocb
->ki_pos
& PAGE_CACHE_MASK
),
273 -1, FI_REMAPF_LOCKED
);
275 mutex_unlock(&inode
->i_mutex
);
277 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
282 trace_xfs_file_read(ip
, size
, iocb
->ki_pos
, ioflags
);
284 ret
= generic_file_aio_read(iocb
, iovp
, nr_segs
, iocb
->ki_pos
);
286 XFS_STATS_ADD(xs_read_bytes
, ret
);
288 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
293 xfs_file_splice_read(
296 struct pipe_inode_info
*pipe
,
300 struct xfs_inode
*ip
= XFS_I(infilp
->f_mapping
->host
);
304 XFS_STATS_INC(xs_read_calls
);
306 if (infilp
->f_mode
& FMODE_NOCMTIME
)
309 if (XFS_FORCED_SHUTDOWN(ip
->i_mount
))
312 xfs_ilock(ip
, XFS_IOLOCK_SHARED
);
314 trace_xfs_file_splice_read(ip
, count
, *ppos
, ioflags
);
316 ret
= generic_file_splice_read(infilp
, ppos
, pipe
, count
, flags
);
318 XFS_STATS_ADD(xs_read_bytes
, ret
);
320 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
325 xfs_aio_write_isize_update(
328 ssize_t bytes_written
)
330 struct xfs_inode
*ip
= XFS_I(inode
);
331 xfs_fsize_t isize
= i_size_read(inode
);
333 if (bytes_written
> 0)
334 XFS_STATS_ADD(xs_write_bytes
, bytes_written
);
336 if (unlikely(bytes_written
< 0 && bytes_written
!= -EFAULT
&&
340 if (*ppos
> ip
->i_size
) {
341 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
342 if (*ppos
> ip
->i_size
)
344 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
349 * If this was a direct or synchronous I/O that failed (such as ENOSPC) then
350 * part of the I/O may have been written to disk before the error occured. In
351 * this case the on-disk file size may have been adjusted beyond the in-memory
352 * file size and now needs to be truncated back.
355 xfs_aio_write_newsize_update(
356 struct xfs_inode
*ip
)
358 if (ip
->i_new_size
) {
359 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
361 if (ip
->i_d
.di_size
> ip
->i_size
)
362 ip
->i_d
.di_size
= ip
->i_size
;
363 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
368 xfs_file_splice_write(
369 struct pipe_inode_info
*pipe
,
370 struct file
*outfilp
,
375 struct inode
*inode
= outfilp
->f_mapping
->host
;
376 struct xfs_inode
*ip
= XFS_I(inode
);
377 xfs_fsize_t new_size
;
381 XFS_STATS_INC(xs_write_calls
);
383 if (outfilp
->f_mode
& FMODE_NOCMTIME
)
386 if (XFS_FORCED_SHUTDOWN(ip
->i_mount
))
389 xfs_ilock(ip
, XFS_IOLOCK_EXCL
);
391 new_size
= *ppos
+ count
;
393 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
394 if (new_size
> ip
->i_size
)
395 ip
->i_new_size
= new_size
;
396 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
398 trace_xfs_file_splice_write(ip
, count
, *ppos
, ioflags
);
400 ret
= generic_file_splice_write(pipe
, outfilp
, ppos
, count
, flags
);
402 xfs_aio_write_isize_update(inode
, ppos
, ret
);
403 xfs_aio_write_newsize_update(ip
);
404 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
409 * This routine is called to handle zeroing any space in the last
410 * block of the file that is beyond the EOF. We do this since the
411 * size is being increased without writing anything to that block
412 * and we don't want anyone to read the garbage on the disk.
414 STATIC
int /* error (positive) */
420 xfs_fileoff_t last_fsb
;
421 xfs_mount_t
*mp
= ip
->i_mount
;
426 xfs_bmbt_irec_t imap
;
428 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
));
430 zero_offset
= XFS_B_FSB_OFFSET(mp
, isize
);
431 if (zero_offset
== 0) {
433 * There are no extra bytes in the last block on disk to
439 last_fsb
= XFS_B_TO_FSBT(mp
, isize
);
441 error
= xfs_bmapi(NULL
, ip
, last_fsb
, 1, 0, NULL
, 0, &imap
,
448 * If the block underlying isize is just a hole, then there
449 * is nothing to zero.
451 if (imap
.br_startblock
== HOLESTARTBLOCK
) {
455 * Zero the part of the last block beyond the EOF, and write it
456 * out sync. We need to drop the ilock while we do this so we
457 * don't deadlock when the buffer cache calls back to us.
459 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
461 zero_len
= mp
->m_sb
.sb_blocksize
- zero_offset
;
462 if (isize
+ zero_len
> offset
)
463 zero_len
= offset
- isize
;
464 error
= xfs_iozero(ip
, isize
, zero_len
);
466 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
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) */
485 xfs_off_t offset
, /* starting I/O offset */
486 xfs_fsize_t isize
) /* current inode size */
488 xfs_mount_t
*mp
= ip
->i_mount
;
489 xfs_fileoff_t start_zero_fsb
;
490 xfs_fileoff_t end_zero_fsb
;
491 xfs_fileoff_t zero_count_fsb
;
492 xfs_fileoff_t last_fsb
;
493 xfs_fileoff_t zero_off
;
494 xfs_fsize_t zero_len
;
497 xfs_bmbt_irec_t imap
;
499 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
|XFS_IOLOCK_EXCL
));
500 ASSERT(offset
> isize
);
503 * First handle zeroing the block on which isize resides.
504 * We only zero a part of that block so it is handled specially.
506 error
= xfs_zero_last_block(ip
, offset
, isize
);
508 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
|XFS_IOLOCK_EXCL
));
513 * Calculate the range between the new size and the old
514 * where blocks needing to be zeroed may exist. To get the
515 * block where the last byte in the file currently resides,
516 * we need to subtract one from the size and truncate back
517 * to a block boundary. We subtract 1 in case the size is
518 * exactly on a block boundary.
520 last_fsb
= isize
? XFS_B_TO_FSBT(mp
, isize
- 1) : (xfs_fileoff_t
)-1;
521 start_zero_fsb
= XFS_B_TO_FSB(mp
, (xfs_ufsize_t
)isize
);
522 end_zero_fsb
= XFS_B_TO_FSBT(mp
, offset
- 1);
523 ASSERT((xfs_sfiloff_t
)last_fsb
< (xfs_sfiloff_t
)start_zero_fsb
);
524 if (last_fsb
== end_zero_fsb
) {
526 * The size was only incremented on its last block.
527 * We took care of that above, so just return.
532 ASSERT(start_zero_fsb
<= end_zero_fsb
);
533 while (start_zero_fsb
<= end_zero_fsb
) {
535 zero_count_fsb
= end_zero_fsb
- start_zero_fsb
+ 1;
536 error
= xfs_bmapi(NULL
, ip
, start_zero_fsb
, zero_count_fsb
,
537 0, NULL
, 0, &imap
, &nimaps
, NULL
);
539 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
|XFS_IOLOCK_EXCL
));
544 if (imap
.br_state
== XFS_EXT_UNWRITTEN
||
545 imap
.br_startblock
== HOLESTARTBLOCK
) {
547 * This loop handles initializing pages that were
548 * partially initialized by the code below this
549 * loop. It basically zeroes the part of the page
550 * that sits on a hole and sets the page as P_HOLE
551 * and calls remapf if it is a mapped file.
553 start_zero_fsb
= imap
.br_startoff
+ imap
.br_blockcount
;
554 ASSERT(start_zero_fsb
<= (end_zero_fsb
+ 1));
559 * There are blocks we need to zero.
560 * Drop the inode lock while we're doing the I/O.
561 * We'll still have the iolock to protect us.
563 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
565 zero_off
= XFS_FSB_TO_B(mp
, start_zero_fsb
);
566 zero_len
= XFS_FSB_TO_B(mp
, imap
.br_blockcount
);
568 if ((zero_off
+ zero_len
) > offset
)
569 zero_len
= offset
- zero_off
;
571 error
= xfs_iozero(ip
, zero_off
, zero_len
);
576 start_zero_fsb
= imap
.br_startoff
+ imap
.br_blockcount
;
577 ASSERT(start_zero_fsb
<= (end_zero_fsb
+ 1));
579 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
585 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
593 const struct iovec
*iovp
,
594 unsigned long nr_segs
,
597 struct file
*file
= iocb
->ki_filp
;
598 struct address_space
*mapping
= file
->f_mapping
;
599 struct inode
*inode
= mapping
->host
;
600 struct xfs_inode
*ip
= XFS_I(inode
);
601 struct xfs_mount
*mp
= ip
->i_mount
;
604 xfs_fsize_t new_size
;
606 size_t ocount
= 0, count
;
609 XFS_STATS_INC(xs_write_calls
);
611 BUG_ON(iocb
->ki_pos
!= pos
);
613 if (unlikely(file
->f_flags
& O_DIRECT
))
614 ioflags
|= IO_ISDIRECT
;
615 if (file
->f_mode
& FMODE_NOCMTIME
)
618 ret
= generic_segment_checks(iovp
, &nr_segs
, &ocount
, VERIFY_READ
);
626 xfs_wait_for_freeze(mp
, SB_FREEZE_WRITE
);
628 if (XFS_FORCED_SHUTDOWN(mp
))
632 if (ioflags
& IO_ISDIRECT
) {
633 iolock
= XFS_IOLOCK_SHARED
;
636 iolock
= XFS_IOLOCK_EXCL
;
638 mutex_lock(&inode
->i_mutex
);
641 xfs_ilock(ip
, XFS_ILOCK_EXCL
|iolock
);
644 ret
= generic_write_checks(file
, &pos
, &count
,
645 S_ISBLK(inode
->i_mode
));
647 xfs_iunlock(ip
, XFS_ILOCK_EXCL
|iolock
);
648 goto out_unlock_mutex
;
651 if (ioflags
& IO_ISDIRECT
) {
652 xfs_buftarg_t
*target
=
653 XFS_IS_REALTIME_INODE(ip
) ?
654 mp
->m_rtdev_targp
: mp
->m_ddev_targp
;
656 if ((pos
& target
->bt_smask
) || (count
& target
->bt_smask
)) {
657 xfs_iunlock(ip
, XFS_ILOCK_EXCL
|iolock
);
658 return XFS_ERROR(-EINVAL
);
661 if (!need_i_mutex
&& (mapping
->nrpages
|| pos
> ip
->i_size
)) {
662 xfs_iunlock(ip
, XFS_ILOCK_EXCL
|iolock
);
663 iolock
= XFS_IOLOCK_EXCL
;
665 mutex_lock(&inode
->i_mutex
);
666 xfs_ilock(ip
, XFS_ILOCK_EXCL
|iolock
);
671 new_size
= pos
+ count
;
672 if (new_size
> ip
->i_size
)
673 ip
->i_new_size
= new_size
;
675 if (likely(!(ioflags
& IO_INVIS
)))
676 file_update_time(file
);
679 * If the offset is beyond the size of the file, we have a couple
680 * of things to do. First, if there is already space allocated
681 * we need to either create holes or zero the disk or ...
683 * If there is a page where the previous size lands, we need
684 * to zero it out up to the new size.
687 if (pos
> ip
->i_size
) {
688 ret
= -xfs_zero_eof(ip
, pos
, ip
->i_size
);
690 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
691 goto out_unlock_internal
;
694 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
697 * If we're writing the file then make sure to clear the
698 * setuid and setgid bits if the process is not being run
699 * by root. This keeps people from modifying setuid and
702 ret
= file_remove_suid(file
);
704 goto out_unlock_internal
;
706 /* We can write back this queue in page reclaim */
707 current
->backing_dev_info
= mapping
->backing_dev_info
;
709 if ((ioflags
& IO_ISDIRECT
)) {
710 if (mapping
->nrpages
) {
711 WARN_ON(need_i_mutex
== 0);
712 ret
= -xfs_flushinval_pages(ip
,
713 (pos
& PAGE_CACHE_MASK
),
714 -1, FI_REMAPF_LOCKED
);
716 goto out_unlock_internal
;
720 /* demote the lock now the cached pages are gone */
721 xfs_ilock_demote(ip
, XFS_IOLOCK_EXCL
);
722 mutex_unlock(&inode
->i_mutex
);
724 iolock
= XFS_IOLOCK_SHARED
;
728 trace_xfs_file_direct_write(ip
, count
, iocb
->ki_pos
, ioflags
);
729 ret
= generic_file_direct_write(iocb
, iovp
,
730 &nr_segs
, pos
, &iocb
->ki_pos
, count
, ocount
);
733 * direct-io write to a hole: fall through to buffered I/O
734 * for completing the rest of the request.
736 if (ret
>= 0 && ret
!= count
) {
737 XFS_STATS_ADD(xs_write_bytes
, ret
);
742 ioflags
&= ~IO_ISDIRECT
;
743 xfs_iunlock(ip
, iolock
);
750 trace_xfs_file_buffered_write(ip
, count
, iocb
->ki_pos
, ioflags
);
751 ret
= generic_file_buffered_write(iocb
, iovp
, nr_segs
,
752 pos
, &iocb
->ki_pos
, count
, ret
);
754 * if we just got an ENOSPC, flush the inode now we
755 * aren't holding any page locks and retry *once*
757 if (ret
== -ENOSPC
&& !enospc
) {
758 ret
= xfs_flush_pages(ip
, 0, -1, 0, FI_NONE
);
760 goto out_unlock_internal
;
766 current
->backing_dev_info
= NULL
;
768 xfs_aio_write_isize_update(inode
, &iocb
->ki_pos
, ret
);
771 goto out_unlock_internal
;
773 /* Handle various SYNC-type writes */
774 if ((file
->f_flags
& O_DSYNC
) || IS_SYNC(inode
)) {
775 loff_t end
= pos
+ ret
- 1;
778 xfs_iunlock(ip
, iolock
);
780 mutex_unlock(&inode
->i_mutex
);
782 error
= filemap_write_and_wait_range(mapping
, pos
, end
);
784 mutex_lock(&inode
->i_mutex
);
785 xfs_ilock(ip
, iolock
);
787 error2
= -xfs_file_fsync(file
,
788 (file
->f_flags
& __O_SYNC
) ? 0 : 1);
796 xfs_aio_write_newsize_update(ip
);
797 xfs_iunlock(ip
, iolock
);
800 mutex_unlock(&inode
->i_mutex
);
809 if (!(file
->f_flags
& O_LARGEFILE
) && i_size_read(inode
) > MAX_NON_LFS
)
811 if (XFS_FORCED_SHUTDOWN(XFS_M(inode
->i_sb
)))
821 struct xfs_inode
*ip
= XFS_I(inode
);
825 error
= xfs_file_open(inode
, file
);
830 * If there are any blocks, read-ahead block 0 as we're almost
831 * certain to have the next operation be a read there.
833 mode
= xfs_ilock_map_shared(ip
);
834 if (ip
->i_d
.di_nextents
> 0)
835 xfs_da_reada_buf(NULL
, ip
, 0, XFS_DATA_FORK
);
836 xfs_iunlock(ip
, mode
);
845 return -xfs_release(XFS_I(inode
));
854 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
855 xfs_inode_t
*ip
= XFS_I(inode
);
860 * The Linux API doesn't pass down the total size of the buffer
861 * we read into down to the filesystem. With the filldir concept
862 * it's not needed for correct information, but the XFS dir2 leaf
863 * code wants an estimate of the buffer size to calculate it's
864 * readahead window and size the buffers used for mapping to
867 * Try to give it an estimate that's good enough, maybe at some
868 * point we can change the ->readdir prototype to include the
869 * buffer size. For now we use the current glibc buffer size.
871 bufsize
= (size_t)min_t(loff_t
, 32768, ip
->i_d
.di_size
);
873 error
= xfs_readdir(ip
, dirent
, bufsize
,
874 (xfs_off_t
*)&filp
->f_pos
, filldir
);
883 struct vm_area_struct
*vma
)
885 vma
->vm_ops
= &xfs_file_vm_ops
;
886 vma
->vm_flags
|= VM_CAN_NONLINEAR
;
893 * mmap()d file has taken write protection fault and is being made
894 * writable. We can set the page state up correctly for a writable
895 * page, which means we can do correct delalloc accounting (ENOSPC
896 * checking!) and unwritten extent mapping.
900 struct vm_area_struct
*vma
,
901 struct vm_fault
*vmf
)
903 return block_page_mkwrite(vma
, vmf
, xfs_get_blocks
);
906 const struct file_operations xfs_file_operations
= {
907 .llseek
= generic_file_llseek
,
908 .read
= do_sync_read
,
909 .write
= do_sync_write
,
910 .aio_read
= xfs_file_aio_read
,
911 .aio_write
= xfs_file_aio_write
,
912 .splice_read
= xfs_file_splice_read
,
913 .splice_write
= xfs_file_splice_write
,
914 .unlocked_ioctl
= xfs_file_ioctl
,
916 .compat_ioctl
= xfs_file_compat_ioctl
,
918 .mmap
= xfs_file_mmap
,
919 .open
= xfs_file_open
,
920 .release
= xfs_file_release
,
921 .fsync
= xfs_file_fsync
,
924 const struct file_operations xfs_dir_file_operations
= {
925 .open
= xfs_dir_open
,
926 .read
= generic_read_dir
,
927 .readdir
= xfs_file_readdir
,
928 .llseek
= generic_file_llseek
,
929 .unlocked_ioctl
= xfs_file_ioctl
,
931 .compat_ioctl
= xfs_file_compat_ioctl
,
933 .fsync
= xfs_file_fsync
,
936 static const struct vm_operations_struct xfs_file_vm_ops
= {
937 .fault
= filemap_fault
,
938 .page_mkwrite
= xfs_vm_page_mkwrite
,