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btrfs: Cleanup num_tolerated_disk_barrier_failures

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As we use per-chunk degradable check, the global
num_tolerated_disk_barrier_failures is of no use.

We can now remove it.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2017-03-09 09:34:41 +08:00 • committed by David Sterba
parent d10b82fe29
commit bc3cce2378
4 changed files with 0 additions and 75 deletions
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54
fs/btrfs/disk-io.c
View file

@ -3611,60 +3611,6 @@ int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags)
return min_tolerated;
}
int btrfs_calc_num_tolerated_disk_barrier_failures(
struct btrfs_fs_info *fs_info)
{
struct btrfs_ioctl_space_info space;
struct btrfs_space_info *sinfo;
u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
BTRFS_BLOCK_GROUP_SYSTEM,
BTRFS_BLOCK_GROUP_METADATA,
BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
int i;
int c;
int num_tolerated_disk_barrier_failures =
(int)fs_info->fs_devices->num_devices;
for (i = 0; i < ARRAY_SIZE(types); i++) {
struct btrfs_space_info *tmp;
sinfo = NULL;
rcu_read_lock();
list_for_each_entry_rcu(tmp, &fs_info->space_info, list) {
if (tmp->flags == types[i]) {
sinfo = tmp;
break;
}
}
rcu_read_unlock();
if (!sinfo)
continue;
down_read(&sinfo->groups_sem);
for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
u64 flags;
if (list_empty(&sinfo->block_groups[c]))
continue;
btrfs_get_block_group_info(&sinfo->block_groups[c],
&space);
if (space.total_bytes == 0 || space.used_bytes == 0)
continue;
flags = space.flags;
num_tolerated_disk_barrier_failures = min(
num_tolerated_disk_barrier_failures,
btrfs_get_num_tolerated_disk_barrier_failures(
flags));
}
up_read(&sinfo->groups_sem);
}
return num_tolerated_disk_barrier_failures;
}
int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
{
struct list_head *head;