From c30666d466c70a30491e45dd8d068360f9dd7693 Mon Sep 17 00:00:00 2001 From: Zhao Lei Date: Wed, 25 Feb 2015 14:17:20 +0800 Subject: btrfs: Set relative data on clear btrfs_block_group_cache->pinned Bug1: space_info->bytes_readonly was set to very large(negative) value in btrfs_remove_block_group(). Reason: Current code set block_group_cache->pinned = 0 in btrfs_delete_unused_bgs(), but above space was not counted to space_info->bytes_readonly. Then in btrfs_remove_block_group(): block_group->space_info->bytes_readonly -= block_group->key.offset; We can see following value in trace: btrfs_remove_block_group: pid=2677 comm=btrfs-cleaner WARNING: bytes_readonly=12582912, key.offset=134217728 Bug2: space_info->total_bytes_pinned grow to value larger than fs size. In a 1.2G fs, we can get following trace log: at first: ZL_DEBUG: add_pinned_bytes: pid=2710 comm=sync change total_bytes_pinned flags=1 869793792 + 95944704 = 965738496 after some op: ZL_DEBUG: add_pinned_bytes: pid=2770 comm=sync change total_bytes_pinned flags=1 1780178944 + 95944704 = 1876123648 after some op: ZL_DEBUG: add_pinned_bytes: pid=3193 comm=sync change total_bytes_pinned flags=1 2924568576 + 95551488 = 3020120064 ... Reason: Similar to bug1, we also need to adjust space_info->total_bytes_pinned in above code block. Signed-off-by: Zhao Lei Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'fs/btrfs/extent-tree.c') diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 01f4db6..7a14a4a 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -9922,8 +9922,18 @@ void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info) mutex_unlock(&fs_info->unused_bg_unpin_mutex); /* Reset pinned so btrfs_put_block_group doesn't complain */ + spin_lock(&space_info->lock); + spin_lock(&block_group->lock); + + space_info->bytes_pinned -= block_group->pinned; + space_info->bytes_readonly += block_group->pinned; + percpu_counter_add(&space_info->total_bytes_pinned, + -block_group->pinned); block_group->pinned = 0; + spin_unlock(&block_group->lock); + spin_unlock(&space_info->lock); + /* * Btrfs_remove_chunk will abort the transaction if things go * horribly wrong. -- cgit v1.1