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Subject[PATCH 1/1] xfs: fix buffer flushing during log unmount
Date
Whenever there is a mount/unmount failure - there is a chance of calling the
callbacks functions once - transaction ail mount pointer is destroyed. So, it results
in NULL pointer exception followed by hang. So, before unmount of the log - flush all
the pending buffers.

Signed-off-by: Amit Sahrawat <amit.sahrawat83@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@gmail.com>
---
fs/xfs/xfs_log.c | 10 ++++++++++
fs/xfs/xfs_mount.c | 9 ---------
2 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index e2cc356..b924a5b 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -739,6 +739,16 @@ xfs_log_unmount_write(xfs_mount_t *mp)
void
xfs_log_unmount(xfs_mount_t *mp)
{
+ int error = 0;
+ /*
+ * Make sure all buffers have been flushed and completed before
+ * unmounting the log.
+ */
+ error = xfs_flush_buftarg(mp->m_ddev_targp, 1);
+ if (error)
+ cmn_err(CE_WARN, "%d busy buffers during log unmount.", error);
+ xfs_wait_buftarg(mp->m_ddev_targp);
+
xfs_trans_ail_destroy(mp);
xlog_dealloc_log(mp->m_log);
}
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index d06afbc..3bd2246 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -1519,15 +1519,6 @@ xfs_unmountfs(
"Freespace may not be correct on next mount.");
xfs_unmountfs_writesb(mp);

- /*
- * Make sure all buffers have been flushed and completed before
- * unmounting the log.
- */
- error = xfs_flush_buftarg(mp->m_ddev_targp, 1);
- if (error)
- xfs_warn(mp, "%d busy buffers during unmount.", error);
- xfs_wait_buftarg(mp->m_ddev_targp);
-
xfs_log_unmount_write(mp);
xfs_log_unmount(mp);
xfs_uuid_unmount(mp);
--
1.7.2.3


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