From: Liu Bo Date: Fri, 26 Aug 2016 01:08:27 +0000 (-0700) Subject: Btrfs: bail out if block group has different mixed flag X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=a4a563129e8d4e132e22f87d74db7b0f0376da93;p=deliverable%2Flinux.git Btrfs: bail out if block group has different mixed flag Currently we allow inconsistence about mixed flag (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA). We'd get ENOSPC if block group has mixed flag and btrfs doesn't. If that happens, we have one space_info with mixed flag and another space_info only with BTRFS_BLOCK_GROUP_METADATA, and global_block_rsv.space_info points to the latter one, but all bytes from block_group contributes to the mixed space_info, thus all the allocation will fail with ENOSPC. This adds a check for the above case. Reported-by: Vegard Nossum Signed-off-by: Liu Bo [ updated message ] Reviewed-by: David Sterba Signed-off-by: David Sterba --- diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 6ccddbfbec42..dd357b5fd59b 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -10125,6 +10125,11 @@ int btrfs_read_block_groups(struct btrfs_root *root) struct extent_buffer *leaf; int need_clear = 0; u64 cache_gen; + u64 feature; + int mixed; + + feature = btrfs_super_incompat_flags(info->super_copy); + mixed = !!(feature & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS); root = info->extent_root; key.objectid = 0; @@ -10178,6 +10183,15 @@ int btrfs_read_block_groups(struct btrfs_root *root) btrfs_item_ptr_offset(leaf, path->slots[0]), sizeof(cache->item)); cache->flags = btrfs_block_group_flags(&cache->item); + if (!mixed && + ((cache->flags & BTRFS_BLOCK_GROUP_METADATA) && + (cache->flags & BTRFS_BLOCK_GROUP_DATA))) { + btrfs_err(info, +"bg %llu is a mixed block group but filesystem hasn't enabled mixed block groups", + cache->key.objectid); + ret = -EINVAL; + goto error; + } key.objectid = found_key.objectid + found_key.offset; btrfs_release_path(path);