[PATCH v2 5/7] ceph: use the parent inode of '.snap' to dencrypt the names for readdir

[xiubli@xxxxxxxxxx]

From: Xiubo Li <xiubli@xxxxxxxxxx>

The inode for '.snap' directory will always with no key setup, so
we can use the parent inode to do this.

Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
---
 fs/ceph/inode.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 877e699fe43b..a6c4965e5363 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -1817,7 +1817,7 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req,
 	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
 	struct qstr dname;
 	struct dentry *dn;
-	struct inode *in;
+	struct inode *in, *pinode;
 	int err = 0, skipped = 0, ret, i;
 	u32 frag = le32_to_cpu(req->r_args.readdir.frag);
 	u32 last_hash = 0;
@@ -1876,11 +1876,13 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req,
 	cache_ctl.index = req->r_readdir_cache_idx;
 	fpos_offset = req->r_readdir_offset;
 
-	err = ceph_fname_alloc_buffer(inode, &tname);
+	pinode = ceph_get_snap_parent_inode(inode);
+
+	err = ceph_fname_alloc_buffer(pinode, &tname);
 	if (err < 0)
 		goto out;
 
-	err = ceph_fname_alloc_buffer(inode, &oname);
+	err = ceph_fname_alloc_buffer(pinode, &oname);
 	if (err < 0)
 		goto out;
 
@@ -1890,7 +1892,7 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req,
 		struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
 		struct ceph_vino tvino;
 		u32 olen = oname.len;
-		struct ceph_fname fname = { .dir	= inode,
+		struct ceph_fname fname = { .dir	= pinode,
 					    .name	= rde->name,
 					    .name_len	= rde->name_len,
 					    .ctext	= rde->altname,
@@ -2045,8 +2047,9 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req,
 		req->r_readdir_cache_idx = cache_ctl.index;
 	}
 	ceph_readdir_cache_release(&cache_ctl);
-	ceph_fname_free_buffer(inode, &tname);
-	ceph_fname_free_buffer(inode, &oname);
+	ceph_fname_free_buffer(pinode, &tname);
+	ceph_fname_free_buffer(pinode, &oname);
+	iput(pinode);
 	dout("readdir_prepopulate done\n");
 	return err;
 }
-- 
2.27.0