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Subject[PATCH RFC 08/10] xfs: Introduce xfs_fs_destroy_super()
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xfs_fs_nr_cached_objects() touches sb->s_fs_info,
and this patch makes it to be destructed later.

After this patch xfs_fs_nr_cached_objects() is safe
for splitting unregister_shrinker(): mp->m_perag_tree
is stable till destroy_super_work(), while iteration
over it is already RCU-protected by internal XFS
business.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
---
fs/xfs/xfs_super.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 9e2ce4cd98e1..c1e00dd06893 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1774,11 +1774,20 @@ xfs_fs_put_super(
xfs_destroy_mount_workqueues(mp);
xfs_close_devices(mp);

- sb->s_fs_info = NULL;
xfs_free_fsname(mp);
- kfree(mp);
}

+STATIC void
+xfs_fs_destroy_super(
+ struct super_block *sb)
+{
+ if (sb->s_fs_info) {
+ kfree(sb->s_fs_info);
+ sb->s_fs_info = NULL;
+ }
+}
+
+
STATIC struct dentry *
xfs_fs_mount(
struct file_system_type *fs_type,
@@ -1816,6 +1825,7 @@ static const struct super_operations xfs_super_operations = {
.dirty_inode = xfs_fs_dirty_inode,
.drop_inode = xfs_fs_drop_inode,
.put_super = xfs_fs_put_super,
+ .destroy_super = xfs_fs_destroy_super,
.sync_fs = xfs_fs_sync_fs,
.freeze_fs = xfs_fs_freeze,
.unfreeze_fs = xfs_fs_unfreeze,
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