From 33b258086441dd07e00133c79fcd8cbc6a76d737 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Wed, 11 Nov 2009 10:16:57 -0500 Subject: Btrfs: allow more metadata chunk preallocation On an FS where all of the space has not been allocated into chunks yet, the enospc can return enospc just because the existing metadata chunks are full. We get around this by allowing more metadata chunks to be allocated up to a certain limit, and finding the right limit is a little fuzzy. The problem is the reservations for delalloc would preallocate way too much of the FS as metadata. We need to start saying no and just force some IO to happen. But we also need to let a reasonable amount of the FS become metadata. This bumps the hard limit up, later releases will have a better system. Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 2a4cdceeb575..8d1fd6dc22ac 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -2976,10 +2976,10 @@ static int maybe_allocate_chunk(struct btrfs_root *root, free_space = btrfs_super_total_bytes(disk_super); /* - * we allow the metadata to grow to a max of either 5gb or 5% of the + * we allow the metadata to grow to a max of either 10gb or 5% of the * space in the volume. */ - min_metadata = min((u64)5 * 1024 * 1024 * 1024, + min_metadata = min((u64)10 * 1024 * 1024 * 1024, div64_u64(free_space * 5, 100)); if (info->total_bytes >= min_metadata) { spin_unlock(&info->lock); -- cgit v1.2.2