teach copy_page_to_iter() to handle compound pages

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In situation when copy_page_to_iter() got a compound page the current
code would only work on systems with no CONFIG_HIGHMEM.  It *is* the majority
of real-world setups, or we would've drown in bug reports by now.  Still needs
fixing.

	Current variant works for solitary page; rename that to
__copy_page_to_iter() and turn the handling of compound pages into a loop over
subpages.

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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Al Viro 2021-04-29 20:42:25 -04:00

parent 66cd071a1f

commit 08aa647960

1 changed files with 25 additions and 3 deletions

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lib/iov_iter.c

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