From 65e5341b9a0c39767ae1fecc727d70eda0dd6d83 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Fri, 24 Dec 2010 06:41:52 -0500 Subject: [PATCH] Btrfs: fix off by one while setting block groups readonly When we read in block groups, we'll set non-redundant groups readonly if we find a raid1, DUP or raid10 group. But the ro code has an off by one bug in the math around testing to make sure out accounting doesn't go wrong. Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 7e5162e..b180efd 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -7971,13 +7971,14 @@ static int set_block_group_ro(struct btrfs_block_group_cache *cache) if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + sinfo->bytes_may_use + sinfo->bytes_readonly + - cache->reserved_pinned + num_bytes < sinfo->total_bytes) { + cache->reserved_pinned + num_bytes <= sinfo->total_bytes) { sinfo->bytes_readonly += num_bytes; sinfo->bytes_reserved += cache->reserved_pinned; cache->reserved_pinned = 0; cache->ro = 1; ret = 0; } + spin_unlock(&cache->lock); spin_unlock(&sinfo->lock); return ret; -- 2.7.4