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authorChristoph Hellwig <hch@infradead.org>2011-06-24 14:29:46 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2011-07-20 20:47:48 -0400
commitdf2d6f26586f12a24f3ae5df4e236dc5c08d6eb4 (patch)
tree68c6ec96177f766d3b9ab0a48408271ef2af4d89 /fs/ocfs2/file.c
parent562c72aa57c36b178eacc3500a0215651eca9429 (diff)
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fs: always maintain i_dio_count
Maintain i_dio_count for all filesystems, not just those using DIO_LOCKING. This these filesystems to also protect truncate against direct I/O requests by using common code. Right now the only non-DIO_LOCKING filesystem that appears to do so is XFS, which uses an opencoded variant of the i_dio_count scheme. Behaviour doesn't change for filesystems never calling inode_dio_wait. For ext4 behaviour changes when using the dioread_nonlock option, which previously was missing any protection between truncate and direct I/O reads. For ocfs2 that handcrafted i_dio_count manipulations are replaced with the common code now enable. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ocfs2/file.c')
-rw-r--r--fs/ocfs2/file.c12
1 files changed, 3 insertions, 9 deletions
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 736283ca4a4..22d60460195 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2240,7 +2240,6 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
relock:
/* to match setattr's i_mutex -> rw_lock ordering */
if (direct_io) {
- atomic_inc(&inode->i_dio_count);
have_alloc_sem = 1;
/* communicate with ocfs2_dio_end_io */
ocfs2_iocb_set_sem_locked(iocb);
@@ -2292,7 +2291,6 @@ relock:
*/
if (direct_io && !can_do_direct) {
ocfs2_rw_unlock(inode, rw_level);
- inode_dio_done(inode);
have_alloc_sem = 0;
rw_level = -1;
@@ -2379,10 +2377,8 @@ out:
ocfs2_rw_unlock(inode, rw_level);
out_sems:
- if (have_alloc_sem) {
- inode_dio_done(inode);
+ if (have_alloc_sem)
ocfs2_iocb_clear_sem_locked(iocb);
- }
mutex_unlock(&inode->i_mutex);
@@ -2533,7 +2529,6 @@ static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
*/
if (filp->f_flags & O_DIRECT) {
have_alloc_sem = 1;
- atomic_inc(&inode->i_dio_count);
ocfs2_iocb_set_sem_locked(iocb);
ret = ocfs2_rw_lock(inode, 0);
@@ -2575,10 +2570,9 @@ static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
}
bail:
- if (have_alloc_sem) {
- inode_dio_done(inode);
+ if (have_alloc_sem)
ocfs2_iocb_clear_sem_locked(iocb);
- }
+
if (rw_level != -1)
ocfs2_rw_unlock(inode, rw_level);