btrfs: abtract out range locking in clone ioctl()

The range locking in btrfs_ioctl_clone is trivially broken out into it's own
function. This reduces the complexity of btrfs_ioctl_clone() by a small bit
and makes that locking code available to future functions in
fs/btrfs/ioctl.c

Signed-off-by: Mark Fasheh <mfasheh@suse.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 556b3d5b18da6f1da0332c37768ce53fd5b04f7d..76c7657a7f53e8519c405eed780d55cc0173c0bb 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2470,6 +2470,26 @@ out:
        return ret;
 }
 
+static inline void lock_extent_range(struct inode *inode, u64 off, u64 len)
+{
+       /* do any pending delalloc/csum calc on src, one way or
+          another, and lock file content */
+       while (1) {
+               struct btrfs_ordered_extent *ordered;
+               lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
+               ordered = btrfs_lookup_first_ordered_extent(inode,
+                                                           off + len - 1);
+               if (!ordered &&
+                   !test_range_bit(&BTRFS_I(inode)->io_tree, off,
+                                   off + len - 1, EXTENT_DELALLOC, 0, NULL))
+                       break;
+               unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
+               if (ordered)
+                       btrfs_put_ordered_extent(ordered);
+               btrfs_wait_ordered_range(inode, off, len);
+       }
+}
+
 static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
                                       u64 off, u64 olen, u64 destoff)
 {
@@ -2598,21 +2618,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
        truncate_inode_pages_range(&inode->i_data, destoff,
                                   PAGE_CACHE_ALIGN(destoff + len) - 1);
 
-       /* do any pending delalloc/csum calc on src, one way or
-          another, and lock file content */
-       while (1) {
-               struct btrfs_ordered_extent *ordered;
-               lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
-               ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1);
-               if (!ordered &&
-                   !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1,
-                                   EXTENT_DELALLOC, 0, NULL))
-                       break;
-               unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
-               if (ordered)
-                       btrfs_put_ordered_extent(ordered);
-               btrfs_wait_ordered_range(src, off, len);
-       }
+       lock_extent_range(src, off, len);
 
        /* clone data */
        key.objectid = btrfs_ino(src);