btrfs: add members to fs_devices to track fsid changes

[sfrench/cifs-2.6.git] / fs / btrfs / volumes.c

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 032310dacf7788c3c1b9d919764c3adc3d19e93c..13bb44194c564459e2114032e524ed606af2d6d5 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -792,6 +792,8 @@ static noinline struct btrfs_device *device_list_add(const char *path,
        u64 devid = btrfs_stack_device_id(&disk_super->dev_item);
        bool has_metadata_uuid = (btrfs_super_incompat_flags(disk_super) &
                BTRFS_FEATURE_INCOMPAT_METADATA_UUID);
+       bool fsid_change_in_progress = (btrfs_super_flags(disk_super) &
+                                       BTRFS_SUPER_FLAG_CHANGING_FSID_V2);
 
        if (has_metadata_uuid)
                fs_devices = find_fsid(disk_super->fsid, disk_super->metadata_uuid);
@@ -805,6 +807,8 @@ static noinline struct btrfs_device *device_list_add(const char *path,
                else
                        fs_devices = alloc_fs_devices(disk_super->fsid, NULL);
 
+               fs_devices->fsid_change = fsid_change_in_progress;
+
                if (IS_ERR(fs_devices))
                        return ERR_CAST(fs_devices);
 
@@ -940,8 +944,11 @@ static noinline struct btrfs_device *device_list_add(const char *path,
         * it back. We need it to pick the disk with largest generation
         * (as above).
         */
-       if (!fs_devices->opened)
+       if (!fs_devices->opened) {
                device->generation = found_transid;
+               fs_devices->latest_generation = max_t(u64, found_transid,
+                                               fs_devices->latest_generation);
+       }
 
        fs_devices->total_devices = btrfs_super_num_devices(disk_super);