From: Josef Bacik Date: Tue, 26 Mar 2013 19:31:45 +0000 (-0400) Subject: Btrfs: limit the global reserve to 512mb X-Git-Tag: v3.4.39~40 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1c7b6ea87236a0c10943379a6476e2354c133cab;p=karo-tx-linux.git Btrfs: limit the global reserve to 512mb commit fdf30d1c1b386e1b73116cc7e0fb14e962b763b0 upstream. A user reported a problem where he was getting early ENOSPC with hundreds of gigs of free data space and 6 gigs of free metadata space. This is because the global block reserve was taking up the entire free metadata space. This is ridiculous, we have infrastructure in place to throttle if we start using too much of the global reserve, so instead of letting it get this huge just limit it to 512mb so that users can still get work done. This allowed the user to complete his rsync without issues. Thanks Reported-and-tested-by: Stefan Priebe Signed-off-by: Josef Bacik Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 49fd7b66d57b..ee6abb8fa71c 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -4217,7 +4217,7 @@ static void update_global_block_rsv(struct btrfs_fs_info *fs_info) spin_lock(&sinfo->lock); spin_lock(&block_rsv->lock); - block_rsv->size = num_bytes; + block_rsv->size = min_t(u64, num_bytes, 512 * 1024 * 1024); num_bytes = sinfo->bytes_used + sinfo->bytes_pinned + sinfo->bytes_reserved + sinfo->bytes_readonly +