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Btrfs-progs: mkfs, fix metadata corruption when using mixed mode

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When creating a filesystem with mixed block groups, we are creating two
space info objects to track used/reserved/pinned space, one only for data
and another one only for metadata.

This is making fstests test case generic/416 fail, with btrfs' check
reporting over an hundred errors about bad extents:

  (...)
  bad extent [17186816, 17190912), type mismatch with chunk
  bad extent [17195008, 17199104), type mismatch with chunk
  bad extent [17203200, 17207296), type mismatch with chunk
  (...)

Because, surprisingly, this results in block groups that do not have the
BTRFS_BLOCK_GROUP_DATA flag set but have data extents allocated in them.
This is a regression introduced in btrfs-progs v5.2.

So fix this by making sure we only create one space info object, for both
metadata and data, when mixed block groups are enabled.

Fixes: c31edf610c ("btrfs-progs: Fix false ENOSPC alert by tracking used space correctly")
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2019-07-25 11:27:17 +01:00 committed by David Sterba
parent 4e48f14f8b
commit df090f6eb7
1 changed files with 12 additions and 6 deletions
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18
mkfs/main.c
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@ -64,18 +64,17 @@ static int create_metadata_block_groups(struct btrfs_root *root, int mixed,
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_trans_handle *trans;
struct btrfs_space_info *sinfo;
u64 flags = BTRFS_BLOCK_GROUP_METADATA;
u64 bytes_used;
u64 chunk_start = 0;
u64 chunk_size = 0;
int ret;
if (mixed)
flags |= BTRFS_BLOCK_GROUP_DATA;
/* Create needed space info to trace extents reservation */
ret = update_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA,
0, 0, &sinfo);
if (ret < 0)
return ret;
ret = update_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA,
0, 0, &sinfo);
ret = update_space_info(fs_info, flags, 0, 0, &sinfo);
if (ret < 0)
return ret;
@ -149,6 +148,13 @@ static int create_data_block_groups(struct btrfs_trans_handle *trans,
int ret = 0;
if (!mixed) {
struct btrfs_space_info *sinfo;
ret = update_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA,
0, 0, &sinfo);
if (ret < 0)
return ret;
ret = btrfs_alloc_chunk(trans, fs_info,
&chunk_start, &chunk_size,
BTRFS_BLOCK_GROUP_DATA);