iomap: use write_begin to read pages to unshare

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Use the existing iomap write_begin code to read the pages unshared
by iomap_file_unshare.  That avoids the extra ->readpage call and
extent tree lookup currently done by read_mapping_page.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

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Christoph Hellwig 2019-10-18 16:42:50 -07:00 • committed by Darrick J. Wong

parent d3b4043969

commit 32a38a4991

1 changed files with 16 additions and 33 deletions

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49

fs/iomap/buffered-io.c

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