btrfs: Add ctime/mtime update for btrfs device add/remove.

[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / btrfs / volumes.c

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index bab0b84..57e7526 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1438,6 +1438,22 @@ out:
        return ret;
 }
 
+/*
+ * Function to update ctime/mtime for a given device path.
+ * Mainly used for ctime/mtime based probe like libblkid.
+ */
+static void update_dev_time(char *path_name)
+{
+       struct file *filp;
+
+       filp = filp_open(path_name, O_RDWR, 0);
+       if (!filp)
+               return;
+       file_update_time(filp);
+       filp_close(filp, NULL);
+       return;
+}
+
 static int btrfs_rm_dev_item(struct btrfs_root *root,
                             struct btrfs_device *device)
 {
@@ -1690,10 +1706,14 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
 
        ret = 0;
 
-       /* Notify udev that device has changed */
-       if (bdev)
+       if (bdev) {
+               /* Notify udev that device has changed */
                btrfs_kobject_uevent(bdev, KOBJ_CHANGE);
 
+               /* Update ctime/mtime for device path for libblkid */
+               update_dev_time(device_path);
+       }
+
 error_brelse:
        brelse(bh);
        if (bdev)
@@ -2132,6 +2152,8 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
                ret = btrfs_commit_transaction(trans, root);
        }
 
+       /* Update ctime/mtime for libblkid */
+       update_dev_time(device_path);
        return ret;
 
 error_trans: