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authorStefan Behrens <sbehrens@giantdisaster.de>2013-08-15 17:11:20 +0200
committerChris Mason <chris.mason@fusionio.com>2013-09-01 08:15:55 -0400
commitdd5f9615fc5c5e8d3751aab3a17b92768fb1ce70 (patch)
tree9b7ad64c2761200e7713ee55e5d667e1b57d0e6b /fs/btrfs/transaction.c
parentf7a81ea4cc6bdb51d8267d2f3ff485f0b4070074 (diff)
downloadop-kernel-dev-dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70.zip
op-kernel-dev-dd5f9615fc5c5e8d3751aab3a17b92768fb1ce70.tar.gz
Btrfs: maintain subvolume items in the UUID tree
When a new subvolume or snapshot is created, a new UUID item is added to the UUID tree. Such items are removed when the subvolume is deleted. The ioctl to set the received subvolume UUID is also touched and will now also add this received UUID into the UUID tree together with the ID of the subvolume. The latter is also done when read-only snapshots are created which inherit all the send/receive information from the parent subvolume. User mode programs use the BTRFS_IOC_TREE_SEARCH ioctl to search and read in the UUID tree. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs/btrfs/transaction.c')
-rw-r--r--fs/btrfs/transaction.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 579efcc..72ab0dd 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1311,8 +1311,26 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
dentry->d_name.len * 2);
parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
ret = btrfs_update_inode_fallback(trans, parent_root, parent_inode);
- if (ret)
+ if (ret) {
+ btrfs_abort_transaction(trans, root, ret);
+ goto fail;
+ }
+ ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root, new_uuid.b,
+ BTRFS_UUID_KEY_SUBVOL, objectid);
+ if (ret) {
btrfs_abort_transaction(trans, root, ret);
+ goto fail;
+ }
+ if (!btrfs_is_empty_uuid(new_root_item->received_uuid)) {
+ ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root,
+ new_root_item->received_uuid,
+ BTRFS_UUID_KEY_RECEIVED_SUBVOL,
+ objectid);
+ if (ret && ret != -EEXIST) {
+ btrfs_abort_transaction(trans, root, ret);
+ goto fail;
+ }
+ }
fail:
pending->error = ret;
dir_item_existed:
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