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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>
This commit is contained in:
Mark Fasheh 2013-08-06 11:42:48 -07:00 committed by Chris Mason
parent a4fdb61e81
commit 77fe20dc62
1 changed files with 21 additions and 15 deletions
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36
fs/btrfs/ioctl.c
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@ -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);