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btrfs: Add raid56 support for updating

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num_tolerated_disk_barrier_failures in btrfs_balance

Code for updating fs_info->num_tolerated_disk_barrier_failures in
btrfs_balance() lacks raid56 support.

Reason:
 Above code was wroten in 2012-08-01, together with
 btrfs_calc_num_tolerated_disk_barrier_failures()'s first version.

 Then, btrfs_calc_num_tolerated_disk_barrier_failures() got updated
 later to support raid56, but code in btrfs_balance() was not
 updated together.

Fix:
 Merge above similar code to a common function:
 btrfs_get_num_tolerated_disk_barrier_failures()
 and make it support both case.

 It can fix this bug with a bonus of cleanup, and make these code
 never in above no-sync state from now on.

Suggested-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Zhao Lei 2015-08-19 15:54:15 +08:00 committed by Chris Mason
parent 2c4580454f
commit 943c6e9925
3 changed files with 30 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
fs/btrfs/disk-io.c
View File

@ -3440,6 +3440,26 @@ static int barrier_all_devices(struct btrfs_fs_info *info)
return 0;
}
int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags)
{
if ((flags & (BTRFS_BLOCK_GROUP_DUP |
BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_AVAIL_ALLOC_BIT_SINGLE)) ||
((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0))
return 0;
if (flags & (BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID10))
return 1;
if (flags & BTRFS_BLOCK_GROUP_RAID6)
return 2;
pr_warn("BTRFS: unknown raid type: %llu\n", flags);
return 0;
}
int btrfs_calc_num_tolerated_disk_barrier_failures(
struct btrfs_fs_info *fs_info)
{
@ -3482,28 +3502,11 @@ int btrfs_calc_num_tolerated_disk_barrier_failures(
if (space.total_bytes == 0 || space.used_bytes == 0)
continue;
flags = space.flags;
/*
* return
* 0: if dup, single or RAID0 is configured for
* any of metadata, system or data, else
* 1: if RAID5 is configured, or if RAID1 or
* RAID10 is configured and only two mirrors
* are used, else
* 2: if RAID6 is configured
*/
if (num_tolerated_disk_barrier_failures > 0 &&
((flags & (BTRFS_BLOCK_GROUP_DUP |
BTRFS_BLOCK_GROUP_RAID0)) ||
((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)))
num_tolerated_disk_barrier_failures = 0;
else if (num_tolerated_disk_barrier_failures > 1 &&
(flags & (BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID5 |
BTRFS_BLOCK_GROUP_RAID10)))
num_tolerated_disk_barrier_failures = 1;
else if (num_tolerated_disk_barrier_failures > 2 &&
(flags & BTRFS_BLOCK_GROUP_RAID6))
num_tolerated_disk_barrier_failures = 2;
num_tolerated_disk_barrier_failures = min(
num_tolerated_disk_barrier_failures,
btrfs_get_num_tolerated_disk_barrier_failures(
flags));
}
up_read(&sinfo->groups_sem);
}

1
fs/btrfs/disk-io.h
View File

@ -139,6 +139,7 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
u64 objectid);
int btree_lock_page_hook(struct page *page, void *data,
void (*flush_fn)(void *));
int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
int btrfs_calc_num_tolerated_disk_barrier_failures(
struct btrfs_fs_info *fs_info);
int __init btrfs_end_io_wq_init(void);

21
fs/btrfs/volumes.c
View File

@ -3585,23 +3585,10 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
} while (read_seqretry(&fs_info->profiles_lock, seq));
if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) {
int num_tolerated_disk_barrier_failures;
u64 target = bctl->sys.target;
num_tolerated_disk_barrier_failures =
btrfs_calc_num_tolerated_disk_barrier_failures(fs_info);
if (num_tolerated_disk_barrier_failures > 0 &&
(target &
(BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_AVAIL_ALLOC_BIT_SINGLE)))
num_tolerated_disk_barrier_failures = 0;
else if (num_tolerated_disk_barrier_failures > 1 &&
(target &
(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10)))
num_tolerated_disk_barrier_failures = 1;
fs_info->num_tolerated_disk_barrier_failures =
num_tolerated_disk_barrier_failures;
fs_info->num_tolerated_disk_barrier_failures = min(
btrfs_calc_num_tolerated_disk_barrier_failures(fs_info),
btrfs_get_num_tolerated_disk_barrier_failures(
bctl->sys.target));
}
ret = insert_balance_item(fs_info->tree_root, bctl);