From 94b947b2f3f84f3bba25d34c4e2a229fc2276830 Mon Sep 17 00:00:00 2001 From: Zhao Lei Date: Sat, 14 Feb 2015 13:23:45 +0800 Subject: [PATCH] btrfs: fix condition of commit transaction Old code bypass commit transaction when we don't have enough pinned space, but another case is there exist freed bgs in current transction, it have possibility to make alloc_chunk success. This patch modify the condition to: if (have_free_bg || have_pinned_space) commit_transaction() Confirmed above action by printk before and after patch. Signed-off-by: Zhao Lei Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 875ba519a131..7b227a65078c 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3857,7 +3857,9 @@ int btrfs_check_data_free_space(struct inode *inode, u64 bytes) struct btrfs_root *root = BTRFS_I(inode)->root; struct btrfs_fs_info *fs_info = root->fs_info; u64 used; - int ret = 0, committed = 0; + int ret = 0; + int committed = 0; + int have_pinned_space = 1; /* make sure bytes are sectorsize aligned */ bytes = ALIGN(bytes, root->sectorsize); @@ -3925,11 +3927,12 @@ alloc: /* * If we don't have enough pinned space to deal with this - * allocation don't bother committing the transaction. + * allocation, and no removed chunk in current transaction, + * don't bother committing the transaction. */ if (percpu_counter_compare(&data_sinfo->total_bytes_pinned, bytes) < 0) - committed = 1; + have_pinned_space = 0; spin_unlock(&data_sinfo->lock); /* commit the current transaction and try again */ @@ -3941,10 +3944,15 @@ commit_trans: trans = btrfs_join_transaction(root); if (IS_ERR(trans)) return PTR_ERR(trans); - ret = btrfs_commit_transaction(trans, root); - if (ret) - return ret; - goto again; + if (have_pinned_space || + trans->transaction->have_free_bgs) { + ret = btrfs_commit_transaction(trans, root); + if (ret) + return ret; + goto again; + } else { + btrfs_end_transaction(trans, root); + } } trace_btrfs_space_reservation(root->fs_info, -- 2.20.1