From: Xiubo Li <xiubli@xxxxxxxxxx>
Get the parent inode for the snap directory ".snap", if the inode
is not a snap directory just return it with the reference increased.
Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
---
fs/ceph/snap.c | 24 ++++++++++++++++++++++++
fs/ceph/super.h | 1 +
2 files changed, 25 insertions(+)
diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
index 322ee5add942..b62c1ace2ee9 100644
--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -1268,3 +1268,27 @@ void ceph_cleanup_snapid_map(struct ceph_mds_client *mdsc)
kfree(sm);
}
}
+
+/*
+ * Get the parent inode for the snap directory ".snap",
+ * if the inode is not a snap directory just return it
+ * with the reference increased.
+ */
+struct inode *ceph_get_snap_parent_inode(struct inode *inode)
+{
+ struct inode *pinode;
+
+ if (ceph_snap(inode) == CEPH_SNAPDIR) {
+ struct ceph_vino vino = {
+ .ino = ceph_ino(inode),
+ .snap = CEPH_NOSNAP,
+ };
+ pinode = ceph_find_inode(inode->i_sb, vino);
+ BUG_ON(!pinode);
+ } else {
+ ihold(inode);
+ pinode = inode;
+ }
+
+ return pinode;
+}
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 6d41a69f5d86..f0268a571621 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -969,6 +969,7 @@ extern void ceph_put_snapid_map(struct ceph_mds_client* mdsc,
struct ceph_snapid_map *sm);
extern void ceph_trim_snapid_map(struct ceph_mds_client *mdsc);
extern void ceph_cleanup_snapid_map(struct ceph_mds_client *mdsc);
+extern struct inode *ceph_get_snap_parent_inode(struct inode *inode);
void ceph_umount_begin(struct super_block *sb);
--
2.27.0
