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| author | Yan, Zheng <zheng.yan@oracle.com> | 2009-09-21 16:00:26 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2009-09-21 16:00:26 -0400 |
| commit | 76dda93c6ae2c1dc3e6cde34569d6aca26b0c918 (patch) | |
| tree | f5ca46ec89d4ae2c762952d5f35e2c6f95ac046a /fs/btrfs/transaction.c | |
| parent | 4df27c4d5cc1dda54ed7d0a8389347f2df359cf9 (diff) | |
| download | linux-0-day-76dda93c6ae2c1dc3e6cde34569d6aca26b0c918.tar.gz linux-0-day-76dda93c6ae2c1dc3e6cde34569d6aca26b0c918.tar.xz | |
Btrfs: add snapshot/subvolume destroy ioctl
This patch adds snapshot/subvolume destroy ioctl. A subvolume that isn't being
used and doesn't contains links to other subvolumes can be destroyed.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/transaction.c')
| -rw-r--r-- | fs/btrfs/transaction.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 915077725fea2..88f866f85e7af 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -104,7 +104,6 @@ static noinline int record_root_in_trans(struct btrfs_trans_handle *trans, { if (root->ref_cows && root->last_trans < trans->transid) { WARN_ON(root == root->fs_info->extent_root); - WARN_ON(root->root_item.refs == 0); WARN_ON(root->commit_root != root->node); radix_tree_tag_set(&root->fs_info->fs_roots_radix, @@ -1078,8 +1077,13 @@ int btrfs_clean_old_snapshots(struct btrfs_root *root) while (!list_empty(&list)) { root = list_entry(list.next, struct btrfs_root, root_list); - list_del_init(&root->root_list); - btrfs_drop_snapshot(root, 0); + list_del(&root->root_list); + + if (btrfs_header_backref_rev(root->node) < + BTRFS_MIXED_BACKREF_REV) + btrfs_drop_snapshot(root, 0); + else + btrfs_drop_snapshot(root, 1); } return 0; } |