new helper: iov_iter_get_pages()

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iov_iter_get_pages(iter, pages, maxsize, &start) grabs references pinning
the pages of up to maxsize of (contiguous) data from iter.  Returns the
amount of memory grabbed or -error.  In case of success, the requested
area begins at offset start in pages[0] and runs through pages[1], etc.
Less than requested amount might be returned - either because the contiguous
area in the beginning of iterator is smaller than requested, or because
the kernel failed to pin that many pages.

direct-io.c switched to using iov_iter_get_pages()

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

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This commit is contained in:

Al Viro 2014-03-15 04:05:57 -04:00

parent 3320c60b3a

commit 7b2c99d155

3 changed files with 67 additions and 73 deletions

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111

fs/direct-io.c

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2

include/linux/uio.h

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27

mm/iov_iter.c

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