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btrfs: fix a bogus warning when converting only data or metadata 

If your filesystem has, eg, data:raid0 metadata:raid1, and you run "btrfs
balance -dconvert=raid1", the meta.target field will be uninitialized.
That's otherwise ok, as it's unused except for this warning.

Thus, let's use the existing set of raid levels for the comparison.

As a side effect, non-convert balances will now nag about data>metadata.

Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Adam Borowski 2017-03-07 23:34:44 +01:00 committed by David Sterba
parent aeea4c10a8
commit 1450612797
1 changed files with 9 additions and 3 deletions
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12
fs/btrfs/volumes.c
View File

@ -3755,6 +3755,7 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
struct btrfs_ioctl_balance_args *bargs)
{
struct btrfs_fs_info *fs_info = bctl->fs_info;
u64 meta_target, data_target;
u64 allowed;
int mixed = 0;
int ret;
@ -3851,11 +3852,16 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
}
} while (read_seqretry(&fs_info->profiles_lock, seq));
if (btrfs_get_num_tolerated_disk_barrier_failures(bctl->meta.target) <
btrfs_get_num_tolerated_disk_barrier_failures(bctl->data.target)) {
/* if we're not converting, the target field is uninitialized */
meta_target = (bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) ?
bctl->meta.target : fs_info->avail_metadata_alloc_bits;
data_target = (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) ?
bctl->data.target : fs_info->avail_data_alloc_bits;
if (btrfs_get_num_tolerated_disk_barrier_failures(meta_target) <
btrfs_get_num_tolerated_disk_barrier_failures(data_target)) {
btrfs_warn(fs_info,
"metadata profile 0x%llx has lower redundancy than data profile 0x%llx",
bctl->meta.target, bctl->data.target);
meta_target, data_target);
}
if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) {