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btrfs: Refactor __get_raid_index() to btrfs_bg_flags_to_raid_index() 

Function __get_raid_index() is used to convert block group flags into
raid index, which can be used to get various info directly from
btrfs_raid_array[].

Refactor this function a little:

1) Rename to btrfs_bg_flags_to_raid_index()
   Double underline prefix is normally for internal functions, while the
   function is used by both extent-tree and volumes.

   Although the name is a little longer, but it should explain its usage
   quite well.

2) Move it to volumes.h and make it static inline
   Just several if-else branches, really no need to define it as a normal
   function.

   This also makes later code re-use between kernel and btrfs-progs
   easier.

3) Remove function get_block_group_index()
   Really no need to do such a simple thing as an exported function.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2018-01-30 18:20:45 +08:00 committed by David Sterba
parent 2f659546c9
commit 3e72ee8874
4 changed files with 33 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/btrfs/ctree.h
View File

@ -2627,7 +2627,6 @@ struct btrfs_block_group_cache *btrfs_lookup_block_group(
u64 bytenr);
void btrfs_get_block_group(struct btrfs_block_group_cache *cache);
void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
int get_block_group_index(struct btrfs_block_group_cache *cache);
struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 parent, u64 root_objectid,
@ -2787,7 +2786,6 @@ int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
int __get_raid_index(u64 flags);
int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);

41
fs/btrfs/extent-tree.c
View File

@ -7345,29 +7345,6 @@ wait_block_group_cache_done(struct btrfs_block_group_cache *cache)
return ret;
}
int __get_raid_index(u64 flags)
{
if (flags & BTRFS_BLOCK_GROUP_RAID10)
return BTRFS_RAID_RAID10;
else if (flags & BTRFS_BLOCK_GROUP_RAID1)
return BTRFS_RAID_RAID1;
else if (flags & BTRFS_BLOCK_GROUP_DUP)
return BTRFS_RAID_DUP;
else if (flags & BTRFS_BLOCK_GROUP_RAID0)
return BTRFS_RAID_RAID0;
else if (flags & BTRFS_BLOCK_GROUP_RAID5)
return BTRFS_RAID_RAID5;
else if (flags & BTRFS_BLOCK_GROUP_RAID6)
return BTRFS_RAID_RAID6;
return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
}
int get_block_group_index(struct btrfs_block_group_cache *cache)
{
return __get_raid_index(cache->flags);
}
static const char *btrfs_raid_type_names[BTRFS_NR_RAID_TYPES] = {
[BTRFS_RAID_RAID10] = "raid10",
[BTRFS_RAID_RAID1] = "raid1",
@ -7482,7 +7459,7 @@ static noinline int find_free_extent(struct btrfs_fs_info *fs_info,
u64 empty_cluster = 0;
struct btrfs_space_info *space_info;
int loop = 0;
int index = __get_raid_index(flags);
int index = btrfs_bg_flags_to_raid_index(flags);
bool failed_cluster_refill = false;
bool failed_alloc = false;
bool use_cluster = true;
@ -7568,7 +7545,8 @@ static noinline int find_free_extent(struct btrfs_fs_info *fs_info,
btrfs_put_block_group(block_group);
up_read(&space_info->groups_sem);
} else {
index = get_block_group_index(block_group);
index = btrfs_bg_flags_to_raid_index(
block_group->flags);
btrfs_lock_block_group(block_group, delalloc);
goto have_block_group;
}
@ -7578,7 +7556,7 @@ static noinline int find_free_extent(struct btrfs_fs_info *fs_info,
}
search:
have_caching_bg = false;
if (index == 0 || index == __get_raid_index(flags))
if (index == 0 || index == btrfs_bg_flags_to_raid_index(flags))
full_search = true;
down_read(&space_info->groups_sem);
list_for_each_entry(block_group, &space_info->block_groups[index],
@ -7836,7 +7814,8 @@ checks:
loop:
failed_cluster_refill = false;
failed_alloc = false;
BUG_ON(index != get_block_group_index(block_group));
BUG_ON(btrfs_bg_flags_to_raid_index(block_group->flags) !=
index);
btrfs_release_block_group(block_group, delalloc);
cond_resched();
}
@ -9642,7 +9621,7 @@ int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr)
*/
target = get_restripe_target(fs_info, block_group->flags);
if (target) {
index = __get_raid_index(extended_to_chunk(target));
index = btrfs_bg_flags_to_raid_index(extended_to_chunk(target));
} else {
/*
* this is just a balance, so if we were marked as full
@ -9656,7 +9635,7 @@ int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr)
goto out;
}
index = get_block_group_index(block_group);
index = btrfs_bg_flags_to_raid_index(block_group->flags);
}
if (index == BTRFS_RAID_RAID10) {
@ -9908,7 +9887,7 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
static void link_block_group(struct btrfs_block_group_cache *cache)
{
struct btrfs_space_info *space_info = cache->space_info;
int index = get_block_group_index(cache);
int index = btrfs_bg_flags_to_raid_index(cache->flags);
bool first = false;
down_write(&space_info->groups_sem);
@ -10328,7 +10307,7 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
block_group->key.offset);
memcpy(&key, &block_group->key, sizeof(key));
index = get_block_group_index(block_group);
index = btrfs_bg_flags_to_raid_index(block_group->flags);
if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP |
BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID10))

2
fs/btrfs/volumes.c
View File

@ -4722,7 +4722,7 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
return -ENOSPC;
}
index = __get_raid_index(type);
index = btrfs_bg_flags_to_raid_index(type);
sub_stripes = btrfs_raid_array[index].sub_stripes;
dev_stripes = btrfs_raid_array[index].dev_stripes;

22
fs/btrfs/volumes.h
View File

@ -544,6 +544,28 @@ static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
btrfs_dev_stat_set(dev, index, 0);
}
/*
* Convert block group flags (BTRFS_BLOCK_GROUP_*) to btrfs_raid_types, which
* can be used as index to access btrfs_raid_array[].
*/
static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags)
{
if (flags & BTRFS_BLOCK_GROUP_RAID10)
return BTRFS_RAID_RAID10;
else if (flags & BTRFS_BLOCK_GROUP_RAID1)
return BTRFS_RAID_RAID1;
else if (flags & BTRFS_BLOCK_GROUP_DUP)
return BTRFS_RAID_DUP;
else if (flags & BTRFS_BLOCK_GROUP_RAID0)
return BTRFS_RAID_RAID0;
else if (flags & BTRFS_BLOCK_GROUP_RAID5)
return BTRFS_RAID_RAID5;
else if (flags & BTRFS_BLOCK_GROUP_RAID6)
return BTRFS_RAID_RAID6;
return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
}
void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info);
void btrfs_update_commit_device_bytes_used(struct btrfs_transaction *trans);