From 6a03843df4d29593912e558c72a2ce39274d2366 Mon Sep 17 00:00:00 2001 From: Miao Xie Date: Wed, 15 May 2013 07:48:24 +0000 Subject: [PATCH] Btrfs: just flush the delalloc inodes in the source tree before snapshot creation Before applying this patch, we need flush all the delalloc inodes in the fs when we want to create a snapshot, it wastes time, and make the transaction commit be blocked for a long time. It means some other user operation would also be blocked for a long time. This patch improves this problem, we just flush the delalloc inodes that in the source trees before snapshot creation, so the transaction commit will complete quickly. Signed-off-by: Miao Xie Signed-off-by: Josef Bacik --- fs/btrfs/ioctl.c | 6 ++++++ fs/btrfs/transaction.c | 10 +--------- 2 files changed, 7 insertions(+), 9 deletions(-) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 10484f4..1f50fe2 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -555,6 +555,12 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir, if (!root->ref_cows) return -EINVAL; + ret = btrfs_start_delalloc_inodes(root, 0); + if (ret) + return ret; + + btrfs_wait_ordered_extents(root, 0); + pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); if (!pending_snapshot) return -ENOMEM; diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 2b17213..bc22be9 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -1491,17 +1491,9 @@ static int btrfs_flush_all_pending_stuffs(struct btrfs_trans_handle *trans, struct btrfs_root *root) { int flush_on_commit = btrfs_test_opt(root, FLUSHONCOMMIT); - int snap_pending = 0; int ret; - if (!flush_on_commit) { - spin_lock(&root->fs_info->trans_lock); - if (!list_empty(&trans->transaction->pending_snapshots)) - snap_pending = 1; - spin_unlock(&root->fs_info->trans_lock); - } - - if (flush_on_commit || snap_pending) { + if (flush_on_commit) { ret = btrfs_start_all_delalloc_inodes(root->fs_info, 1); if (ret) return ret; -- 2.7.4