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fs: Do to trim high file position bits in iomap_page_mkwrite_actor

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iomap_page_mkwrite_actor() calls __block_write_begin_int() with position
masked as pos & ~PAGE_MASK which is equivalent to pos & (PAGE_SIZE-1).
Thus it masks off high bits of file position. However
__block_write_begin_int() expects full file position on input. This does
not cause any visible issues because all __block_write_begin_int()
really cares about are low file position bits but still it is a bug
waiting to happen.

Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Jan Kara 2016-10-24 14:20:25 +11:00 committed by Dave Chinner
parent 64e6428ddd
commit c663e29f88
1 changed files with 1 additions and 2 deletions
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3
fs/iomap.c
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@ -433,8 +433,7 @@ iomap_page_mkwrite_actor(struct inode *inode, loff_t pos, loff_t length,
struct page *page = data;
int ret;
ret = __block_write_begin_int(page, pos & ~PAGE_MASK, length,
NULL, iomap);
ret = __block_write_begin_int(page, pos, length, NULL, iomap);
if (ret)
return ret;