From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Call generic_write_sync() from the deferred I/O completion handler if
O_DSYNC is set for a write request. Also make sure various callers
don't call generic_write_sync if the direct I/O code returns
-EIOCBQUEUED.
Based on an earlier patch from Jan Kara <jack@xxxxxxx> with updates from
Jeff Moyer <jmoyer@xxxxxxxxxx> and Darrick J. Wong <darrick.wong@xxxxxxxxxx>.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/block_dev.c | 2 +-
fs/btrfs/file.c | 2 +-
fs/cifs/file.c | 2 +-
fs/direct-io.c | 21 ++++++++++++++++++++-
fs/ext4/file.c | 2 +-
mm/filemap.c | 2 +-
6 files changed, 25 insertions(+), 6 deletions(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index bb43ce0..a884054 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1512,7 +1512,7 @@ ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
blk_start_plug(&plug);
ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
- if (ret > 0 || ret == -EIOCBQUEUED) {
+ if (ret > 0) {
ssize_t err;
err = generic_write_sync(file, pos, ret);
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 89da56a..6eb61da 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1610,7 +1610,7 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
*/
BTRFS_I(inode)->last_trans = root->fs_info->generation + 1;
BTRFS_I(inode)->last_sub_trans = root->log_transid;
- if (num_written > 0 || num_written == -EIOCBQUEUED) {
+ if (num_written > 0) {
err = generic_write_sync(file, pos, num_written);
if (err < 0 && num_written > 0)
num_written = err;
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 91d8629..275ab19 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -2530,7 +2530,7 @@ cifs_writev(struct kiocb *iocb, const struct iovec *iov,
mutex_unlock(&inode->i_mutex);
}
- if (rc > 0 || rc == -EIOCBQUEUED) {
+ if (rc > 0) {
ssize_t err;
err = generic_write_sync(file, pos, rc);
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 36bddad..fe8562e 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -266,8 +266,18 @@ static ssize_t dio_complete(struct dio *dio, loff_t offset, ssize_t ret,
dio->end_io(dio->iocb, offset, transferred, dio->private);
inode_dio_done(dio->inode);
- if (is_async)
+ if (is_async) {
+ if (dio->rw & WRITE) {
+ int err;
+
+ err = generic_write_sync(dio->iocb->ki_filp, offset,
+ transferred);
+ if (err < 0 && ret > 0)
+ ret = err;
+ }
+
aio_complete(dio->iocb, ret, 0);
+ }
kmem_cache_free(dio_cache, dio);
return ret;
@@ -1161,6 +1171,15 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
dio->is_async = !is_sync_kiocb(iocb) && !((rw & WRITE) &&
(end > i_size_read(inode)));
+ /*
+ * For AIO O_(D)SYNC writes we need to defer completions to a workqueue
+ * so that we can call ->fsync.
+ */
+ if (dio->is_async && (rw & WRITE) &&
+ ((iocb->ki_filp->f_flags & O_DSYNC) ||
+ IS_SYNC(iocb->ki_filp->f_mapping->host)))
+ dio->defer_completion = true;
+
retval = 0;
dio->inode = inode;
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 6f4cc56..bb9efc0 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -149,7 +149,7 @@ ext4_file_dio_write(struct kiocb *iocb, const struct iovec *iov,
ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
mutex_unlock(&inode->i_mutex);
- if (ret > 0 || ret == -EIOCBQUEUED) {
+ if (ret > 0) {
ssize_t err;
err = generic_write_sync(file, pos, ret);
diff --git a/mm/filemap.c b/mm/filemap.c
index 7905fe7..928572e 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2550,7 +2550,7 @@ ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
mutex_unlock(&inode->i_mutex);
- if (ret > 0 || ret == -EIOCBQUEUED) {
+ if (ret > 0) {
ssize_t err;
err = generic_write_sync(file, pos, ret);
--
1.8.1.4
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