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authorAl Viro <viro@zeniv.linux.org.uk>2014-03-19 09:16:16 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2014-05-07 01:32:52 +0400
commitf67da30c1d5fc9e341bc8121708874bfd7b31e45 (patch)
tree504966ed27e82dbcbe31786c9a0851a4ae79ef3e /fs/fuse
parent5b46f25ddc6edf4adff1a137d453da542c27a640 (diff)
downloadlinux-f67da30c1d5fc9e341bc8121708874bfd7b31e45.tar.xz
new helper: iov_iter_npages()
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>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/file.c16
1 files changed, 2 insertions, 14 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 7db564d18dc6..7026014717bc 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -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,