From: Josef Bacik Date: Thu, 20 Jun 2013 16:31:27 +0000 (-0400) Subject: Btrfs: stop using try_to_writeback_inodes_sb_nr to flush delalloc X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=925a6efb8ff0c2bdbec107ed9890e62650c83306;p=openwrt%2Fstaging%2Fblogic.git Btrfs: stop using try_to_writeback_inodes_sb_nr to flush delalloc try_to_writeback_inodes_sb_nr returns 1 if writeback is already underway, which is completely fraking useless for us as we need to make sure pages are actually written before we go and check if there are ordered extents. So replace this with an open coding of try_to_writeback_inodes_sb_nr minus the writeback underway check so that we are sure to actually have flushed some dirty pages out and will have ordered extents to use. With this patch xfstests generic/273 now passes. Thanks, Signed-off-by: Josef Bacik --- diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index bbd3db7d0833..5154b91f6380 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3943,12 +3943,11 @@ static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, unsigned long nr_pages) { struct super_block *sb = root->fs_info->sb; - int started; - /* If we can not start writeback, just sync all the delalloc file. */ - started = try_to_writeback_inodes_sb_nr(sb, nr_pages, - WB_REASON_FS_FREE_SPACE); - if (!started) { + if (down_read_trylock(&sb->s_umount)) { + writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE); + up_read(&sb->s_umount); + } else { /* * We needn't worry the filesystem going from r/w to r/o though * we don't acquire ->s_umount mutex, because the filesystem