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btrfs: merge functions for wait snapshot creation 

wait_for_snapshot_creation() is in same group with oher two:
 btrfs_start_write_no_snapshoting()
 btrfs_end_write_no_snapshoting()

Rename wait_for_snapshot_creation() and move it into same place
with other two.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Zhao Lei 2016-01-06 18:56:36 +08:00 committed by Chris Mason
parent ee22f0c4ec
commit 0bc19f9031
3 changed files with 22 additions and 21 deletions
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1
fs/btrfs/ctree.h
View File

@ -3641,6 +3641,7 @@ int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
int __get_raid_index(u64 flags);
int btrfs_start_write_no_snapshoting(struct btrfs_root *root);
void btrfs_end_write_no_snapshoting(struct btrfs_root *root);
void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
void check_system_chunk(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
const u64 type);

20
fs/btrfs/extent-tree.c
View File

@ -10817,3 +10817,23 @@ int btrfs_start_write_no_snapshoting(struct btrfs_root *root)
}
return 1;
}
static int wait_snapshoting_atomic_t(atomic_t *a)
{
schedule();
return 0;
}
void btrfs_wait_for_snapshot_creation(struct btrfs_root *root)
{
while (true) {
int ret;
ret = btrfs_start_write_no_snapshoting(root);
if (ret)
break;
wait_on_atomic_t(&root->will_be_snapshoted,
wait_snapshoting_atomic_t,
TASK_UNINTERRUPTIBLE);
}
}

22
fs/btrfs/inode.c
View File

@ -4871,26 +4871,6 @@ next:
return err;
}
static int wait_snapshoting_atomic_t(atomic_t *a)
{
schedule();
return 0;
}
static void wait_for_snapshot_creation(struct btrfs_root *root)
{
while (true) {
int ret;
ret = btrfs_start_write_no_snapshoting(root);
if (ret)
break;
wait_on_atomic_t(&root->will_be_snapshoted,
wait_snapshoting_atomic_t,
TASK_UNINTERRUPTIBLE);
}
}
static int btrfs_setsize(struct inode *inode, struct iattr *attr)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
@ -4922,7 +4902,7 @@ static int btrfs_setsize(struct inode *inode, struct iattr *attr)
* truncation, it must capture all writes that happened before
* this truncation.
*/
wait_for_snapshot_creation(root);
btrfs_wait_for_snapshot_creation(root);
ret = btrfs_cont_expand(inode, oldsize, newsize);
if (ret) {
btrfs_end_write_no_snapshoting(root);