btrfs: make use of btrfs_scratch_superblocks() in btrfs_rm_device()
With the previous patches now the btrfs_scratch_superblocks() is ready to
be used in btrfs_rm_device() so use it.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
[ use GFP_KERNEL ]
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index d742605..8264b06 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1752,13 +1752,11 @@
{
struct btrfs_device *device;
struct btrfs_device *next_device;
- struct block_device *bdev = NULL;
- struct buffer_head *bh = NULL;
- struct btrfs_super_block *disk_super = NULL;
struct btrfs_fs_devices *cur_devices;
u64 num_devices;
int ret = 0;
bool clear_super = false;
+ char *dev_name = NULL;
mutex_lock(&uuid_mutex);
@@ -1786,6 +1784,11 @@
list_del_init(&device->dev_alloc_list);
device->fs_devices->rw_devices--;
unlock_chunks(root);
+ dev_name = kstrdup(device->name->str, GFP_KERNEL);
+ if (!dev_name) {
+ ret = -ENOMEM;
+ goto error_undo;
+ }
clear_super = true;
}
@@ -1869,73 +1872,19 @@
* remove it from the devices list and zero out the old super
*/
if (clear_super) {
- u64 bytenr;
- int i;
+ struct block_device *bdev;
- if (!disk_super) {
- ret = btrfs_get_bdev_and_sb(device_path,
- FMODE_WRITE | FMODE_EXCL,
- root->fs_info->bdev_holder, 0,
- &bdev, &bh);
- if (ret) {
- /*
- * It could be a failed device ok for clear_super
- * to fail. So return success
- */
- ret = 0;
- goto out;
- }
-
- disk_super = (struct btrfs_super_block *)bh->b_data;
- }
- /* make sure this device isn't detected as part of
- * the FS anymore
- */
- memset(&disk_super->magic, 0, sizeof(disk_super->magic));
- set_buffer_dirty(bh);
- sync_dirty_buffer(bh);
- brelse(bh);
-
- /* clear the mirror copies of super block on the disk
- * being removed, 0th copy is been taken care above and
- * the below would take of the rest
- */
- for (i = 1; i < BTRFS_SUPER_MIRROR_MAX; i++) {
- bytenr = btrfs_sb_offset(i);
- if (bytenr + BTRFS_SUPER_INFO_SIZE >=
- i_size_read(bdev->bd_inode))
- break;
-
- bh = __bread(bdev, bytenr / 4096,
- BTRFS_SUPER_INFO_SIZE);
- if (!bh)
- continue;
-
- disk_super = (struct btrfs_super_block *)bh->b_data;
-
- if (btrfs_super_bytenr(disk_super) != bytenr ||
- btrfs_super_magic(disk_super) != BTRFS_MAGIC) {
- brelse(bh);
- continue;
- }
- memset(&disk_super->magic, 0,
- sizeof(disk_super->magic));
- set_buffer_dirty(bh);
- sync_dirty_buffer(bh);
- brelse(bh);
- }
-
- 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);
+ bdev = blkdev_get_by_path(dev_name, FMODE_READ | FMODE_EXCL,
+ root->fs_info->bdev_holder);
+ if (!IS_ERR(bdev)) {
+ btrfs_scratch_superblocks(bdev, dev_name);
blkdev_put(bdev, FMODE_READ | FMODE_EXCL);
}
}
out:
+ kfree(dev_name);
+
mutex_unlock(&uuid_mutex);
return ret;