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authorRyan Ding <ryan.ding@oracle.com>2016-03-25 14:21:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-25 16:37:42 -0700
commitce170828e24959c69e7a40364731edc0535c550f (patch)
tree2b05b56f6aae6888099a358422c8308d3ac94fc9
parenta86a72a4a4e0ec109a98e2737948864ed6794bf7 (diff)
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>
-rw-r--r--fs/ocfs2/aops.c27
1 files changed, 17 insertions, 10 deletions
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 0f3816325808..328ac7f99d52 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -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)) {

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