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ocfs2: fix disk file size and memory file size mismatch 

When doing append direct write in an already allocated cluster, and fast
path in ocfs2_dio_get_block() is triggered, function
ocfs2_dio_end_io_write() will be skipped as there is no context
allocated.

As a result, the disk file size will not be changed as it should be.
The solution is to skip fast path when we are about to change file size.

Fixes: af1310367f41 ("ocfs2: fix sparse file & data ordering issue in direct io.")
Signed-off-by: Ryan Ding <ryan.ding@oracle.com>
Acked-by: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ryan Ding 2016-03-25 14:21:20 -07:00 committed by Linus Torvalds
parent a86a72a4a4
commit ce170828e2
1 changed files with 17 additions and 10 deletions
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27
fs/ocfs2/aops.c
View File

@ -2167,19 +2167,26 @@ static int ocfs2_dio_get_block(struct inode *inode, sector_t iblock,
mlog(0, "get block of %lu at %llu:%u req %u\n",
inode->i_ino, pos, len, total_len);
down_read(&oi->ip_alloc_sem);
/* This is the fast path for re-write. */
ret = ocfs2_get_block(inode, iblock, bh_result, create);
/*
* Because we need to change file size in ocfs2_dio_end_io_write(), or
* we may need to add it to orphan dir. So can not fall to fast path
* while file size will be changed.
*/
if (pos + total_len <= i_size_read(inode)) {
down_read(&oi->ip_alloc_sem);
/* This is the fast path for re-write. */
ret = ocfs2_get_block(inode, iblock, bh_result, create);
up_read(&oi->ip_alloc_sem);
up_read(&oi->ip_alloc_sem);
if (buffer_mapped(bh_result) &&
!buffer_new(bh_result) &&
ret == 0)
goto out;
if (buffer_mapped(bh_result) &&
!buffer_new(bh_result) &&
ret == 0)
goto out;
/* Clear state set by ocfs2_get_block. */
bh_result->b_state = 0;
/* Clear state set by ocfs2_get_block. */
bh_result->b_state = 0;
}
dwc = ocfs2_dio_alloc_write_ctx(bh_result, &first_get_block);
if (unlikely(dwc == NULL)) {