From: TARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com>
Date: Tue, 9 Feb 2010 06:36:45 +0000 (+0000)
Subject: btrfs: Update existing btrfs_device for renaming device
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3a0524dc054791688177544fe510d2868ee20d9f;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

btrfs: Update existing btrfs_device for renaming device

When we scan devices in a multi-device filesystem, we memorize the original
name.  If the device gets a new name, later scans don't update the
in-kernel structures related to it, and we're not able to mount the
filesystem.

This patch updates device name during scaning.

Signed-off-by: TARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index ace2e8d7bbcd..eb89e1317aca 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -365,6 +365,7 @@ static noinline int device_list_add(const char *path,
 	struct btrfs_device *device;
 	struct btrfs_fs_devices *fs_devices;
 	u64 found_transid = btrfs_super_generation(disk_super);
+	char *name;
 
 	fs_devices = find_fsid(disk_super->fsid);
 	if (!fs_devices) {
@@ -411,6 +412,12 @@ static noinline int device_list_add(const char *path,
 
 		device->fs_devices = fs_devices;
 		fs_devices->num_devices++;
+	} else if (strcmp(device->name, path)) {
+		name = kstrdup(path, GFP_NOFS);
+		if (!name)
+			return -ENOMEM;
+		kfree(device->name);
+		device->name = name;
 	}
 
 	if (found_transid > fs_devices->latest_trans) {