In order for ->follow_link to be safe in RCU-walk, any
data structures accessed need to be freed after
an RCU grace period.
'struct xfs_mount' is not currently guaranteed to be delayed
sufficiently, so use kfree_rcu() to free it.
Signed-off-by: NeilBrown <ne...@suse.de>
---
fs/xfs/xfs_mount.h | 2 ++
fs/xfs/xfs_super.c | 2 +-
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 0d8abd6364d9..6a1094e493e9 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -185,6 +185,8 @@ typedef struct xfs_mount {
* to various other kinds of pain inflicted on the pNFS server.
*/
__uint32_t m_generation;
+
+ struct rcu_head m_rcu;
} xfs_mount_t;
/*
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 8fcc4ccc5c79..3827be14383c 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1047,7 +1047,7 @@ xfs_fs_put_super(
xfs_destroy_mount_workqueues(mp);
xfs_close_devices(mp);
xfs_free_fsname(mp);
- kfree(mp);
+ kfree_rcu(mp, m_rcu);
}
STATIC int
--
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