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iomap: mark ->iomap_end as optional

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No need to implement it for read-only mappings.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Christoph Hellwig 2016-08-17 08:42:34 +10:00 committed by Dave Chinner
parent ac2dc058bc
commit f20ac7ab17
1 changed files with 5 additions and 2 deletions
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7
fs/iomap.c
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@ -84,8 +84,11 @@ iomap_apply(struct inode *inode, loff_t pos, loff_t length, unsigned flags,
* Now the data has been copied, commit the range we've copied. This
* should not fail unless the filesystem has had a fatal error.
*/
ret = ops->iomap_end(inode, pos, length, written > 0 ? written : 0,
flags, &iomap);
if (ops->iomap_end) {
ret = ops->iomap_end(inode, pos, length,
written > 0 ? written : 0,
flags, &iomap);
}
return written ? written : ret;
}