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Btrfs: fix off-by-one in file clone

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Btrfs uses inclusive range end for lock_extent(), unlock_extent() and
related functions, so we made off-by-one errors in file clone.

This fixes it and also fixes some style problems.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
This commit is contained in:
Liu Bo 2012-09-18 03:52:23 -06:00 committed by Chris Mason
parent 7e97b8daf6
commit aa42ffd918
1 changed files with 9 additions and 9 deletions
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18
fs/btrfs/ioctl.c
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@ -2481,13 +2481,13 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
another, and lock file content */
while (1) {
struct btrfs_ordered_extent *ordered;
lock_extent(&BTRFS_I(src)->io_tree, off, off+len);
ordered = btrfs_lookup_first_ordered_extent(src, off+len);
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,
EXTENT_DELALLOC, 0, NULL))
!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);
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);
@ -2561,7 +2561,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
btrfs_release_path(path);
if (key.offset + datal <= off ||
key.offset >= off+len)
key.offset >= off + len - 1)
goto next;
memcpy(&new_key, &key, sizeof(new_key));
@ -2662,8 +2662,8 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
new_key.offset += skip;
}
if (key.offset + datal > off+len)
trim = key.offset + datal - (off+len);
if (key.offset + datal > off + len)
trim = key.offset + datal - (off + len);
if (comp && (skip || trim)) {
ret = -EINVAL;
@ -2740,7 +2740,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
ret = 0;
out:
btrfs_release_path(path);
unlock_extent(&BTRFS_I(src)->io_tree, off, off+len);
unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
out_unlock:
mutex_unlock(&src->i_mutex);
mutex_unlock(&inode->i_mutex);