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btrfs: use raid_attr to get allowed profiles for balance conversion 

Iterate over the table and gather all allowed profiles for a given
number of devices, instead of open coding.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-05-17 11:43:27 +02:00
parent fc9a2ac77c
commit 081db89b13
1 changed files with 5 additions and 9 deletions
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14
fs/btrfs/volumes.c
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@ -4047,6 +4047,7 @@ int btrfs_balance(struct btrfs_fs_info *fs_info,
u64 num_devices;
unsigned seq;
bool reducing_integrity;
int i;
if (btrfs_fs_closing(fs_info) ||
atomic_read(&fs_info->balance_pause_req) ||
@ -4076,16 +4077,11 @@ int btrfs_balance(struct btrfs_fs_info *fs_info,
}
num_devices = btrfs_num_devices(fs_info);
allowed = 0;
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;
allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE | BTRFS_BLOCK_GROUP_DUP;
if (num_devices > 1)
allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1);
if (num_devices >= 2)
allowed |= BTRFS_BLOCK_GROUP_RAID5;
if (num_devices >= 3)
allowed |= BTRFS_BLOCK_GROUP_RAID6;
if (num_devices > 3)
allowed |= BTRFS_BLOCK_GROUP_RAID10;
if (validate_convert_profile(&bctl->data, allowed)) {
int index = btrfs_bg_flags_to_raid_index(bctl->data.target);