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new helper: iov_iter_bvec()
similar to iov_iter_kvec(), for ITER_BVEC ones Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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26bc420b59
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@ -1006,11 +1006,8 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
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}
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/* ... iov_iter */
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from.type = ITER_BVEC | WRITE;
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from.bvec = array;
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from.nr_segs = n;
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from.count = sd.total_len - left;
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from.iov_offset = 0;
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iov_iter_bvec(&from, ITER_BVEC | WRITE, array, n,
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sd.total_len - left);
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/* ... and iocb */
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init_sync_kiocb(&kiocb, out);
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@ -88,7 +88,9 @@ size_t iov_iter_zero(size_t bytes, struct iov_iter *);
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unsigned long iov_iter_alignment(const struct iov_iter *i);
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void iov_iter_init(struct iov_iter *i, int direction, const struct iovec *iov,
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unsigned long nr_segs, size_t count);
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void iov_iter_kvec(struct iov_iter *i, int direction, const struct kvec *iov,
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void iov_iter_kvec(struct iov_iter *i, int direction, const struct kvec *kvec,
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unsigned long nr_segs, size_t count);
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void iov_iter_bvec(struct iov_iter *i, int direction, const struct bio_vec *bvec,
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unsigned long nr_segs, size_t count);
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ssize_t iov_iter_get_pages(struct iov_iter *i, struct page **pages,
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size_t maxsize, unsigned maxpages, size_t *start);
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@ -501,18 +501,31 @@ size_t iov_iter_single_seg_count(const struct iov_iter *i)
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EXPORT_SYMBOL(iov_iter_single_seg_count);
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void iov_iter_kvec(struct iov_iter *i, int direction,
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const struct kvec *iov, unsigned long nr_segs,
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const struct kvec *kvec, unsigned long nr_segs,
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size_t count)
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{
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BUG_ON(!(direction & ITER_KVEC));
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i->type = direction;
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i->kvec = (struct kvec *)iov;
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i->kvec = kvec;
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i->nr_segs = nr_segs;
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i->iov_offset = 0;
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i->count = count;
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}
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EXPORT_SYMBOL(iov_iter_kvec);
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void iov_iter_bvec(struct iov_iter *i, int direction,
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const struct bio_vec *bvec, unsigned long nr_segs,
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size_t count)
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{
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BUG_ON(!(direction & ITER_BVEC));
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i->type = direction;
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i->bvec = bvec;
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i->nr_segs = nr_segs;
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i->iov_offset = 0;
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i->count = count;
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}
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EXPORT_SYMBOL(iov_iter_bvec);
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unsigned long iov_iter_alignment(const struct iov_iter *i)
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{
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unsigned long res = 0;
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@ -269,14 +269,9 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
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.bv_len = PAGE_SIZE,
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.bv_offset = 0
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};
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struct iov_iter from = {
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.type = ITER_BVEC | WRITE,
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.count = PAGE_SIZE,
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.iov_offset = 0,
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.nr_segs = 1,
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};
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from.bvec = &bv; /* older gcc versions are broken */
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struct iov_iter from;
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iov_iter_bvec(&from, ITER_BVEC | WRITE, &bv, 1, PAGE_SIZE);
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init_sync_kiocb(&kiocb, swap_file);
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kiocb.ki_pos = page_file_offset(page);
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kiocb.ki_nbytes = PAGE_SIZE;
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