diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2014-03-19 01:16:16 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2014-05-06 17:32:52 -0400 |
| commit | f67da30c1d5fc9e341bc8121708874bfd7b31e45 (patch) | |
| tree | 504966ed27e82dbcbe31786c9a0851a4ae79ef3e /fs | |
| parent | 5b46f25ddc6edf4adff1a137d453da542c27a640 (diff) | |
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')
| -rw-r--r-- | fs/direct-io.c | 9 | ||||
| -rw-r--r-- | fs/fuse/file.c | 16 |
2 files changed, 3 insertions, 22 deletions
diff --git a/fs/direct-io.c b/fs/direct-io.c index 4b410d58faae..98040ba388ac 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -1100,7 +1100,6 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, get_block_t get_block, dio_iodone_t end_io, dio_submit_t submit_io, int flags) { - int seg; unsigned i_blkbits = ACCESS_ONCE(inode->i_blkbits); unsigned blkbits = i_blkbits; unsigned blocksize_mask = (1 << blkbits) - 1; @@ -1108,7 +1107,6 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, loff_t end = offset + iov_iter_count(iter); struct dio *dio; struct dio_submit sdio = { 0, }; - unsigned long user_addr; struct buffer_head map_bh = { 0, }; struct blk_plug plug; unsigned long align = offset | iov_iter_alignment(iter); @@ -1231,12 +1229,7 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, if (unlikely(sdio.blkfactor)) sdio.pages_in_io = 2; - for (seg = 0; seg < iter->nr_segs; seg++) { - user_addr = (unsigned long)iter->iov[seg].iov_base; - sdio.pages_in_io += - ((user_addr + iter->iov[seg].iov_len + PAGE_SIZE-1) / - PAGE_SIZE - user_addr / PAGE_SIZE); - } + sdio.pages_in_io += iov_iter_npages(iter, INT_MAX); blk_start_plug(&plug); 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, |