btrfs: Return right extent when fiemap gives unaligned offset and len.

When page aligned start and len passed to extent_fiemap(), the result is
good, but when start and len is not aligned, e.g. start = 1 and len =
4095 is passed to extent_fiemap(), it returns no extent.

The problem is that start and len is all rounded down which causes the
problem. This patch will round down start and round up (start + len) to
return right extent.

Reported-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index a389820d158b5b7ae64a2c6dfecabbb6ed3ed9bb..1c70cff4a9e1e7d5e48213c6d0e3be54f8b29cc9 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4213,8 +4213,8 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
                return -ENOMEM;
        path->leave_spinning = 1;
 
-       start = ALIGN(start, BTRFS_I(inode)->root->sectorsize);
-       len = ALIGN(len, BTRFS_I(inode)->root->sectorsize);
+       start = round_down(start, BTRFS_I(inode)->root->sectorsize);
+       len = round_up(max, BTRFS_I(inode)->root->sectorsize) - start;
 
        /*
         * lookup the last file extent.  We're not using i_size here