diff options
Diffstat (limited to 'fs/btrfs/defrag.c')
| -rw-r--r-- | fs/btrfs/defrag.c | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/fs/btrfs/defrag.c b/fs/btrfs/defrag.c index f2ff4cbe8656..dde70f358d6f 100644 --- a/fs/btrfs/defrag.c +++ b/fs/btrfs/defrag.c @@ -343,8 +343,8 @@ int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info) * better reflect disk order */ -int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, - struct btrfs_root *root) +static int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, + struct btrfs_root *root) { struct btrfs_path *path = NULL; struct btrfs_key key; @@ -461,6 +461,45 @@ done: } /* + * Defrag a given btree. Every leaf in the btree is read and defragmented. + */ +int btrfs_defrag_root(struct btrfs_root *root) +{ + struct btrfs_fs_info *fs_info = root->fs_info; + int ret; + + if (test_and_set_bit(BTRFS_ROOT_DEFRAG_RUNNING, &root->state)) + return 0; + + while (1) { + struct btrfs_trans_handle *trans; + + trans = btrfs_start_transaction(root, 0); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + break; + } + + ret = btrfs_defrag_leaves(trans, root); + + btrfs_end_transaction(trans); + btrfs_btree_balance_dirty(fs_info); + cond_resched(); + + if (btrfs_fs_closing(fs_info) || ret != -EAGAIN) + break; + + if (btrfs_defrag_cancelled(fs_info)) { + btrfs_debug(fs_info, "defrag_root cancelled"); + ret = -EAGAIN; + break; + } + } + clear_bit(BTRFS_ROOT_DEFRAG_RUNNING, &root->state); + return ret; +} + +/* * Defrag specific helper to get an extent map. * * Differences between this and btrfs_get_extent() are: |