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Subject[PATCH 2/4] ext3: call blkdev_issue_flush on fsync
To ensure that bits are truly on-disk after an fsync,
ext3 should call blkdev_issue_flush if barriers are supported.

Inspired by an old thread on barriers, by reiserfs & xfs
which do the same, and by a patch SuSE ships with their kernel

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---
fs/ext3/fsync.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/fs/ext3/fsync.c b/fs/ext3/fsync.c
index d336341..f6167ec 100644
--- a/fs/ext3/fsync.c
+++ b/fs/ext3/fsync.c
@@ -27,6 +27,7 @@
#include <linux/sched.h>
#include <linux/writeback.h>
#include <linux/jbd.h>
+#include <linux/blkdev.h>
#include <linux/ext3_fs.h>
#include <linux/ext3_jbd.h>

@@ -45,6 +46,7 @@
int ext3_sync_file(struct file * file, struct dentry *dentry, int datasync)
{
struct inode *inode = dentry->d_inode;
+ journal_t *journal = EXT3_SB(inode->i_sb)->s_journal;
int ret = 0;

J_ASSERT(ext3_journal_current_handle() == NULL);
@@ -85,6 +87,9 @@ int ext3_sync_file(struct file * file, struct dentry *dentry, int datasync)
.nr_to_write = 0, /* sys_fsync did this */
};
ret = sync_inode(inode, &wbc);
+
+ if (journal && (journal->j_flags & JFS_BARRIER))
+ blkdev_issue_flush(inode->i_sb->s_bdev, NULL);
}
out:
return ret;
-- 1.5.3.6


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