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Date: Wed, 14 Aug 2013 11:10:56 +0200
From: Jan Kara <jack@...e.cz>
To: linux-fsdevel@...r.kernel.org
Cc: linux-ext4@...r.kernel.org, xfs@....sgi.com,
Christoph Hellwig <hch@...radead.org>,
Al Viro <viro@...IV.linux.org.uk>,
Christoph Hellwig <hch@....de>, Jan Kara <jack@...e.cz>
Subject: [PATCH 2/2] direct-io: Handle O_(D)SYNC AIO
From: Christoph Hellwig <hch@...radead.org>
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@...e.cz> with updates from
Jeff Moyer <jmoyer@...hat.com> and Darrick J. Wong <darrick.wong@...cle.com>.
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Jan Kara <jack@...e.cz>
---
fs/block_dev.c | 2 +-
fs/btrfs/file.c | 2 +-
fs/cifs/file.c | 2 +-
fs/direct-io.c | 45 ++++++++++++++++++++++++++++++++++++---------
fs/ext4/file.c | 2 +-
mm/filemap.c | 2 +-
6 files changed, 41 insertions(+), 14 deletions(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index c7bda5c..1173a4e 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1519,7 +1519,7 @@ 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 8e686a4..4d2eb64 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1727,7 +1727,7 @@ 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 1e57f36..d2653ee 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -2552,7 +2552,7 @@ 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 8b31b9f..1782023 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;
@@ -1183,11 +1193,6 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
}
/*
- * Will be decremented at I/O completion time.
- */
- atomic_inc(&inode->i_dio_count);
-
- /*
* For file extending writes updating i_size before data
* writeouts complete can expose uninitialized blocks. So
* even for AIO, we need to wait for i/o to complete before
@@ -1195,11 +1200,33 @@ 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)));
-
- retval = 0;
-
dio->inode = inode;
dio->rw = rw;
+
+ /*
+ * 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))) {
+ retval = dio_set_defer_completion(dio);
+ if (retval) {
+ /*
+ * We grab i_mutex only for reads so we don't have
+ * to release it here
+ */
+ kmem_cache_free(dio_cache, dio);
+ goto out;
+ }
+ }
+
+ /*
+ * Will be decremented at I/O completion time.
+ */
+ atomic_inc(&inode->i_dio_count);
+
+ retval = 0;
sdio.blkbits = blkbits;
sdio.blkfactor = i_blkbits - blkbits;
sdio.block_in_file = offset >> blkbits;
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 4b51ac1..731a2c2 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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