btrfs: keep orphans for subvolume deletion
Since we have the free space caches, btrfs_orphan_cleanup also runs for the tree_root. Unfortunately this also cleans up the orphans used to mark subvol deletions in progress. Currently if a subvol deletion gets interrupted twice by umount/mount, the deletion will not be continued and the space permanently lost, though it would be possible to write a tool to recover those lost subvol deletions. This patch checks if the orphan belongs to a subvol (dead root) and skips the deletion. Signed-off-by: Arne Jansen <sensille@gmx.net> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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@ -2158,6 +2158,38 @@ int btrfs_orphan_cleanup(struct btrfs_root *root)
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if (ret && ret != -ESTALE)
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goto out;
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if (ret == -ESTALE && root == root->fs_info->tree_root) {
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struct btrfs_root *dead_root;
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struct btrfs_fs_info *fs_info = root->fs_info;
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int is_dead_root = 0;
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/*
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* this is an orphan in the tree root. Currently these
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* could come from 2 sources:
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* a) a snapshot deletion in progress
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* b) a free space cache inode
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* We need to distinguish those two, as the snapshot
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* orphan must not get deleted.
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* find_dead_roots already ran before us, so if this
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* is a snapshot deletion, we should find the root
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* in the dead_roots list
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*/
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spin_lock(&fs_info->trans_lock);
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list_for_each_entry(dead_root, &fs_info->dead_roots,
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root_list) {
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if (dead_root->root_key.objectid ==
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found_key.objectid) {
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is_dead_root = 1;
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break;
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}
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}
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spin_unlock(&fs_info->trans_lock);
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if (is_dead_root) {
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/* prevent this orphan from being found again */
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key.offset = found_key.objectid - 1;
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continue;
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}
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}
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/*
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* Inode is already gone but the orphan item is still there,
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* kill the orphan item.
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