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author | Al Viro <viro@zeniv.linux.org.uk> | 2014-03-15 04:05:57 -0400 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2014-05-06 17:32:50 -0400 |
commit | 7b2c99d15559e285384c742db52316802e24b0bd (patch) | |
tree | 0f5260039ca25431decd1affc281aea5a5da27da /mm/iov_iter.c | |
parent | 3320c60b3a26d05666285c55ab08ee043c017ba3 (diff) | |
download | linux-7b2c99d15559e285384c742db52316802e24b0bd.tar.gz linux-7b2c99d15559e285384c742db52316802e24b0bd.tar.bz2 linux-7b2c99d15559e285384c742db52316802e24b0bd.zip |
new helper: iov_iter_get_pages()
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>
Diffstat (limited to 'mm/iov_iter.c')
-rw-r--r-- | mm/iov_iter.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/mm/iov_iter.c b/mm/iov_iter.c index e2c9a2db4350..45204cd5ccd8 100644 --- a/mm/iov_iter.c +++ b/mm/iov_iter.c @@ -235,3 +235,30 @@ void iov_iter_init(struct iov_iter *i, int direction, i->count = count; } EXPORT_SYMBOL(iov_iter_init); + +ssize_t iov_iter_get_pages(struct iov_iter *i, + struct page **pages, size_t maxsize, + size_t *start) +{ + size_t offset = i->iov_offset; + const struct iovec *iov = i->iov; + size_t len; + unsigned long addr; + int n; + int res; + + len = iov->iov_len - offset; + if (len > i->count) + len = i->count; + if (len > maxsize) + len = maxsize; + addr = (unsigned long)iov->iov_base + offset; + len += *start = addr & (PAGE_SIZE - 1); + addr &= ~(PAGE_SIZE - 1); + n = (len + PAGE_SIZE - 1) / PAGE_SIZE; + res = get_user_pages_fast(addr, n, (i->type & WRITE) != WRITE, pages); + if (unlikely(res < 0)) + return res; + return (res == n ? len : res * PAGE_SIZE) - *start; +} +EXPORT_SYMBOL(iov_iter_get_pages); |