afs: Fix rename operation status delivery

commit b98f0ec91c42d87a70da42726b852ac8d78a3257 upstream.

The afs_deliver_fs_rename() and yfs_deliver_fs_rename() functions both only
decode the second file status returned unless the parent directories are
different - unfortunately, this means that the xdr pointer isn't advanced
and the volsync record will be read incorrectly in such an instance.

Fix this by always decoding the second status into the second
status/callback block which wasn't being used if the dirs were the same.

The afs_update_dentry_version() calls that update the directory data
version numbers on the dentries can then unconditionally use the second
status record as this will always reflect the state of the destination dir
(the two records will be identical if the destination dir is the same as
the source dir)

Fixes: 260a980317da ("[AFS]: Add "directory write" support.")
Fixes: 30062bd13e36 ("afs: Implement YFS support in the fs client")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 12 insertions, 21 deletions

diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 5c794f4b051a..31d297e0f765 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -1892,7 +1892,6 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	if (afs_begin_vnode_operation(&fc, orig_dvnode, key, true)) {
 		afs_dataversion_t orig_data_version;
 		afs_dataversion_t new_data_version;
-		struct afs_status_cb *new_scb = &scb[1];
 
 		orig_data_version = orig_dvnode->status.data_version + 1;
 
@@ -1904,7 +1903,6 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
 			new_data_version = new_dvnode->status.data_version + 1;
 		} else {
 			new_data_version = orig_data_version;
-			new_scb = &scb[0];
 		}
 
 		while (afs_select_fileserver(&fc)) {
@@ -1912,7 +1910,7 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
 			fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode);
 			afs_fs_rename(&fc, old_dentry->d_name.name,
 				      new_dvnode, new_dentry->d_name.name,
-				      &scb[0], new_scb);
+				      &scb[0], &scb[1]);
 		}
 
 		afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break,
@@ -1957,13 +1955,8 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
 		 * Note that if we ever implement RENAME_EXCHANGE, we'll have
 		 * to update both dentries with opposing dir versions.
 		 */
-		if (new_dvnode != orig_dvnode) {
-			afs_update_dentry_version(&fc, old_dentry, &scb[1]);
-			afs_update_dentry_version(&fc, new_dentry, &scb[1]);
-		} else {
-			afs_update_dentry_version(&fc, old_dentry, &scb[0]);
-			afs_update_dentry_version(&fc, new_dentry, &scb[0]);
-		}
+		afs_update_dentry_version(&fc, old_dentry, &scb[1]);
+		afs_update_dentry_version(&fc, new_dentry, &scb[1]);
 		d_move(old_dentry, new_dentry);
 		goto error_tmp;
 	}
diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c
index 4acb0c378858..6805a469d13c 100644
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -988,16 +988,16 @@ static int afs_deliver_fs_rename(struct afs_call *call)
 	if (ret < 0)
 		return ret;
 
-	/* unmarshall the reply once we've received all of it */
+	/* If the two dirs are the same, we have two copies of the same status
+	 * report, so we just decode it twice.
+	 */
 	bp = call->buffer;
 	ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
 	if (ret < 0)
 		return ret;
-	if (call->out_dir_scb != call->out_scb) {
-		ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
-		if (ret < 0)
-			return ret;
-	}
+	ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
+	if (ret < 0)
+		return ret;
 	xdr_decode_AFSVolSync(&bp, call->out_volsync);
 
 	_leave(" = 0 [done]");
diff --git a/fs/afs/yfsclient.c b/fs/afs/yfsclient.c
index 323bec02cc9b..31b236c6b1f7 100644
--- a/fs/afs/yfsclient.c
+++ b/fs/afs/yfsclient.c
@@ -1158,11 +1158,9 @@ static int yfs_deliver_fs_rename(struct afs_call *call)
 	ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
 	if (ret < 0)
 		return ret;
-	if (call->out_dir_scb != call->out_scb) {
-		ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
-		if (ret < 0)
-			return ret;
-	}
+	ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
+	if (ret < 0)
+		return ret;
 
 	xdr_decode_YFSVolSync(&bp, call->out_volsync);
 	_leave(" = 0 [done]");