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authorZhao Lei <zhaolei@cn.fujitsu.com>2015-08-19 09:54:15 +0200
committerChris Mason <clm@fb.com>2015-08-31 20:45:48 +0200
commit943c6e9925d90dc80207322b5799d95fb90ffec0 (patch)
tree69a7b06454f007c6788d665274de93708ea3a394 /fs/btrfs
parentbtrfs: Cleanup for btrfs_calc_num_tolerated_disk_barrier_failures (diff)
downloadlinux-943c6e9925d90dc80207322b5799d95fb90ffec0.tar.xz
linux-943c6e9925d90dc80207322b5799d95fb90ffec0.zip
btrfs: Add raid56 support for updating
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>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/disk-io.c47
-rw-r--r--fs/btrfs/disk-io.h1
-rw-r--r--fs/btrfs/volumes.c21
3 files changed, 30 insertions, 39 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 51192d94c90c..0b658d0230f0 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -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);
}
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index d4cbfeeeedd4..bdfb479ea859 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -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);
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 69520dfa8960..644e070b3bd2 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -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);