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| author | Al Viro <viro@zeniv.linux.org.uk> | 2014-06-18 20:34:33 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2014-08-07 14:40:11 -0400 |
| commit | c7f3888ad7f0932a87fb76e6e4edff2a90cc7920 (patch) | |
| tree | d108b0518699032b366b78fe461be3fc0fa307d2 /mm/iov_iter.c | |
| parent | 49c7dd287adffc972e6dd6cf7011d63c7c5c2e10 (diff) | |
| download | linux-c7f3888ad7f0932a87fb76e6e4edff2a90cc7920.tar.gz linux-c7f3888ad7f0932a87fb76e6e4edff2a90cc7920.tar.bz2 linux-c7f3888ad7f0932a87fb76e6e4edff2a90cc7920.zip | |
switch iov_iter_get_pages() to passing maximal number of pages
... instead of maximal size.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm/iov_iter.c')
| -rw-r--r-- | mm/iov_iter.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/mm/iov_iter.c b/mm/iov_iter.c index 7b5dbd1517b5..ab88dc0ea1d3 100644 --- a/mm/iov_iter.c +++ b/mm/iov_iter.c @@ -310,7 +310,7 @@ void iov_iter_init(struct iov_iter *i, int direction, EXPORT_SYMBOL(iov_iter_init); static ssize_t get_pages_iovec(struct iov_iter *i, - struct page **pages, size_t maxsize, + struct page **pages, unsigned maxpages, size_t *start) { size_t offset = i->iov_offset; @@ -323,10 +323,10 @@ static ssize_t get_pages_iovec(struct iov_iter *i, 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); + if (len > maxpages * PAGE_SIZE) + len = maxpages * PAGE_SIZE; addr &= ~(PAGE_SIZE - 1); n = (len + PAGE_SIZE - 1) / PAGE_SIZE; res = get_user_pages_fast(addr, n, (i->type & WRITE) != WRITE, pages); @@ -588,15 +588,14 @@ static unsigned long alignment_bvec(const struct iov_iter *i) } static ssize_t get_pages_bvec(struct iov_iter *i, - struct page **pages, size_t maxsize, + struct page **pages, unsigned maxpages, size_t *start) { const struct bio_vec *bvec = i->bvec; size_t len = bvec->bv_len - i->iov_offset; if (len > i->count) len = i->count; - if (len > maxsize) - len = maxsize; + /* can't be more than PAGE_SIZE */ *start = bvec->bv_offset + i->iov_offset; get_page(*pages = bvec->bv_page); @@ -712,13 +711,13 @@ unsigned long iov_iter_alignment(const struct iov_iter *i) EXPORT_SYMBOL(iov_iter_alignment); ssize_t iov_iter_get_pages(struct iov_iter *i, - struct page **pages, size_t maxsize, + struct page **pages, unsigned maxpages, size_t *start) { if (i->type & ITER_BVEC) - return get_pages_bvec(i, pages, maxsize, start); + return get_pages_bvec(i, pages, maxpages, start); else - return get_pages_iovec(i, pages, maxsize, start); + return get_pages_iovec(i, pages, maxpages, start); } EXPORT_SYMBOL(iov_iter_get_pages); |