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Btrfs: fix off-by-one in fiemap

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lock_extent/unlock_extent expect an exclusive end.

Tested-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Liu Bo 2013-05-01 16:23:41 +00:00 committed by Josef Bacik
parent 60b62978bc
commit a52f4cd2b1
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/extent_io.c
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@ -3989,7 +3989,7 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
last_for_get_extent = isize;
}
lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len, 0,
lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len - 1, 0,
&cached_state);
em = get_extent_skip_holes(inode, start, last_for_get_extent,
@ -4076,7 +4076,7 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
out_free:
free_extent_map(em);
out:
unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len,
unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1,
&cached_state, GFP_NOFS);
return ret;
}