diff options
| author | Christoph Hellwig <hch@infradead.org> | 2011-06-24 14:29:46 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2011-07-20 20:47:48 -0400 |
| commit | df2d6f26586f12a24f3ae5df4e236dc5c08d6eb4 (patch) | |
| tree | 68c6ec96177f766d3b9ab0a48408271ef2af4d89 /fs/ocfs2/file.c | |
| parent | 562c72aa57c36b178eacc3500a0215651eca9429 (diff) | |
| download | linux-rt-df2d6f26586f12a24f3ae5df4e236dc5c08d6eb4.tar.gz | |
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.c | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index 736283ca4a4c..22d604601957 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); |