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| author | Qu Wenruo <wqu@suse.com> | 2019-09-25 10:13:27 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-09-25 16:00:37 +0200 |
| commit | fab273595507a9ec7035df6d5512a955d80a80ba (patch) | |
| tree | 722375c515bfb86b4b9e66cd4fde307e3c90eba1 /fs/btrfs | |
| parent | 1fac4a54374f7ef385938f3c6cf7649c0fe4f6cd (diff) | |
| download | linux-fab273595507a9ec7035df6d5512a955d80a80ba.tar.bz2 | |
btrfs: Fix a regression which we can't convert to SINGLE profile
[BUG]
With v5.3 kernel, we can't convert to SINGLE profile:
# btrfs balance start -f -dconvert=single $mnt
ERROR: error during balancing '/mnt/btrfs': Invalid argument
# dmesg -t | tail
validate_convert_profile: data profile=0x1000000000000 allowed=0x20 is_valid=1 final=0x1000000000000 ret=1
BTRFS error (device dm-3): balance: invalid convert data profile single
[CAUSE]
With the extra debug output added, it shows that the @allowed bit is
lacking the special in-memory only SINGLE profile bit.
Thus we fail at that (profile & ~allowed) check.
This regression is caused by commit 081db89b13cb ("btrfs: use raid_attr
to get allowed profiles for balance conversion") and the fact that we
don't use any bit to indicate SINGLE profile on-disk, but uses special
in-memory only bit to help distinguish different profiles.
[FIX]
Add that BTRFS_AVAIL_ALLOC_BIT_SINGLE to @allowed, so the code should be
the same as it was and fix the regression.
Reported-by: Chris Murphy <lists@colorremedies.com>
Fixes: 081db89b13cb ("btrfs: use raid_attr to get allowed profiles for balance conversion")
CC: stable@vger.kernel.org # 5.3+
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/volumes.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index a324480bc88b..cdd7af424033 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -4063,7 +4063,13 @@ int btrfs_balance(struct btrfs_fs_info *fs_info, } num_devices = btrfs_num_devices(fs_info); - allowed = 0; + + /* + * SINGLE profile on-disk has no profile bit, but in-memory we have a + * special bit for it, to make it easier to distinguish. Thus we need + * to set it manually, or balance would refuse the profile. + */ + allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE; for (i = 0; i < ARRAY_SIZE(btrfs_raid_array); i++) if (num_devices >= btrfs_raid_array[i].devs_min) allowed |= btrfs_raid_array[i].bg_flag; |