I think something like the following patch (totally untested,
just an idea) should fix the issue, right?
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index c4893e226fd8..555fcae9a18f 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -135,7 +135,7 @@ xfs_file_fsync(
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
int error = 0;
- int log_flushed = 0;
+ unsigned int flushseq;
xfs_lsn_t lsn = 0;
trace_xfs_file_fsync(ip);
@@ -143,6 +143,7 @@ xfs_file_fsync(
error = file_write_and_wait_range(file, start, end);
if (error)
return error;
+ flushseq = READ_ONCE(mp->m_flushseq);
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
@@ -181,7 +182,7 @@ xfs_file_fsync(
}
if (lsn) {
- error = _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, &log_flushed);
+ error = _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, NULL);
ip->i_itemp->ili_fsync_fields = 0;
}
xfs_iunlock(ip, XFS_ILOCK_SHARED);
@@ -193,8 +194,9 @@ xfs_file_fsync(
* an already allocated file and thus do not have any metadata to
* commit.
*/
- if (!log_flushed && !XFS_IS_REALTIME_INODE(ip) &&
- mp->m_logdev_targp == mp->m_ddev_targp)
+ if (!XFS_IS_REALTIME_INODE(ip) &&
+ mp->m_logdev_targp == mp->m_ddev_targp &&
+ flushseq == READ_ONCE(mp->m_flushseq))
xfs_blkdev_issue_flush(mp->m_ddev_targp);
return error;
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index bcb2f860e508..3c0cbb98581e 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -2922,6 +2922,8 @@ xlog_state_done_syncing(
iclog->ic_state = XLOG_STATE_DONE_SYNC;
}
+ log->l_mp->m_flushseq++;
+
/*
* Someone could be sleeping prior to writing out the next
* iclog buffer, we wake them all, one will get to do the
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index e0792d036be2..556e01a0175e 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -79,6 +79,7 @@ typedef struct xfs_mount {
struct percpu_counter m_icount; /* allocated inodes counter */
struct percpu_counter m_ifree; /* free inodes counter */
struct percpu_counter m_fdblocks; /* free block counter */
+ unsigned int m_flushseq;
struct xfs_buf *m_sb_bp; /* buffer for superblock */
char *m_fsname; /* filesystem name */