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new helper: iov_iter_npages()

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counts the pages covered by iov_iter, up to given limit.
do_block_direct_io() and fuse_iter_npages() switched to
it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2014-03-19 01:16:16 -04:00
parent 5b46f25ddc
commit f67da30c1d
4 changed files with 31 additions and 22 deletions
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16
fs/fuse/file.c
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@@ -1310,7 +1310,7 @@ static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii,
while (nbytes < *nbytesp && req->num_pages < req->max_pages) {
unsigned npages;
size_t start, end, frag_size;
size_t start;
unsigned n = req->max_pages - req->num_pages;
ssize_t ret = iov_iter_get_pages(ii,
&req->pages[req->num_pages],
@@ -1344,19 +1344,7 @@ static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii,
static inline int fuse_iter_npages(const struct iov_iter *ii_p)
{
struct iov_iter ii = *ii_p;
int npages = 0;
while (iov_iter_count(&ii) && npages < FUSE_MAX_PAGES_PER_REQ) {
unsigned long user_addr = fuse_get_user_addr(&ii);
unsigned offset = user_addr & ~PAGE_MASK;
size_t frag_size = iov_iter_single_seg_count(&ii);
npages += (frag_size + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
iov_iter_advance(&ii, frag_size);
}
return min(npages, FUSE_MAX_PAGES_PER_REQ);
return iov_iter_npages(ii_p, FUSE_MAX_PAGES_PER_REQ);
}
ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,