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>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index e9c2f88..a949664 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -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);

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index abcffa4..8e80798 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -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);
+       }
+}

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 8ad9e22..b8bb759 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -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);