diff options
| -rw-r--r-- | fs/btrfs/send.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index a5da82f..3ddd2bb 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -5104,6 +5104,7 @@ out: static int full_send_tree(struct send_ctx *sctx) { int ret; + struct btrfs_trans_handle *trans = NULL; struct btrfs_root *send_root = sctx->send_root; struct btrfs_key key; struct btrfs_key found_key; @@ -5125,6 +5126,19 @@ static int full_send_tree(struct send_ctx *sctx) key.type = BTRFS_INODE_ITEM_KEY; key.offset = 0; +join_trans: + /* + * We need to make sure the transaction does not get committed + * while we do anything on commit roots. Join a transaction to prevent + * this. + */ + trans = btrfs_join_transaction(send_root); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + trans = NULL; + goto out; + } + /* * Make sure the tree has not changed after re-joining. We detect this * by comparing start_ctransid and ctransid. They should always match. @@ -5148,6 +5162,19 @@ static int full_send_tree(struct send_ctx *sctx) goto out_finish; while (1) { + /* + * When someone want to commit while we iterate, end the + * joined transaction and rejoin. + */ + if (btrfs_should_end_transaction(trans, send_root)) { + ret = btrfs_end_transaction(trans, send_root); + trans = NULL; + if (ret < 0) + goto out; + btrfs_release_path(path); + goto join_trans; + } + eb = path->nodes[0]; slot = path->slots[0]; btrfs_item_key_to_cpu(eb, &found_key, slot); @@ -5175,6 +5202,12 @@ out_finish: out: btrfs_free_path(path); + if (trans) { + if (!ret) + ret = btrfs_end_transaction(trans, send_root); + else + btrfs_end_transaction(trans, send_root); + } return ret; } |
