1 // SPDX-License-Identifier: GPL-2.0-or-later
17  * netfs_extract_user_iter - Extract the pages from a user iterator into a bvec
27  * @extraction_flags can have ITER_ALLOW_P2PDMA set to request peer-to-peer DMA be
47 	size_t count = orig_len, offset, len;  in netfs_extract_user_iter()  local
51 		return -EIO;  in netfs_extract_user_iter()
57 		return -ENOMEM;  in netfs_extract_user_iter()
61 	 * 0->last, we should be fine.  in netfs_extract_user_iter()
64 	pages = (void *)bv + bv_size - pg_size;  in netfs_extract_user_iter()
68 					     max_pages - npages, extraction_flags,  in netfs_extract_user_iter()
80 		count -= ret;  in netfs_extract_user_iter()
91 			len = ret > PAGE_SIZE ? PAGE_SIZE : ret;  in netfs_extract_user_iter()
92 			bvec_set_page(bv + npages + i, *pages++, len - offset, offset);  in netfs_extract_user_iter()
93 			ret -= len;  in netfs_extract_user_iter()
100 	iov_iter_bvec(new, orig->data_source, bv, npages, orig_len - count);  in netfs_extract_user_iter()
112 	const struct bio_vec *bvecs = iter->bvec;  in netfs_limit_bvec()
113 	unsigned int nbv = iter->nr_segs, ix = 0, nsegs = 0;  in netfs_limit_bvec()
114 	size_t len, span = 0, n = iter->count;  in netfs_limit_bvec()  local
115 	size_t skip = iter->iov_offset + start_offset;  in netfs_limit_bvec()
123 		len = bvecs[ix].bv_len;  in netfs_limit_bvec()
124 		if (skip < len)  in netfs_limit_bvec()
126 		skip -= len;  in netfs_limit_bvec()
127 		n -= len;  in netfs_limit_bvec()
132 		len = min3(n, bvecs[ix].bv_len - skip, max_size);  in netfs_limit_bvec()
133 		span += len;  in netfs_limit_bvec()
139 		n -= len;  in netfs_limit_bvec()
142 	return min(span, max_size);  in netfs_limit_bvec()
156 	loff_t pos = iter->xarray_start + iter->iov_offset;  in netfs_limit_xarray()
158 	size_t span = 0, n = iter->count;  in netfs_limit_xarray()
160 	XA_STATE(xas, iter->xarray, index);  in netfs_limit_xarray()
166 	max_size = min(max_size, n - start_offset);  in netfs_limit_xarray()
170 		size_t offset, flen, len;  in netfs_limit_xarray()  local
180 		len = min(max_size, flen - offset);  in netfs_limit_xarray()
181 		span += len;  in netfs_limit_xarray()
188 	return min(span, max_size);  in netfs_limit_xarray()
199 	const struct folio_queue *folioq = iter->folioq;  in netfs_limit_folioq()
201 	unsigned int slot = iter->folioq_slot;  in netfs_limit_folioq()
202 	size_t span = 0, n = iter->count;  in netfs_limit_folioq()
208 	max_size = umin(max_size, n - start_offset);  in netfs_limit_folioq()
211 		folioq = folioq->next;  in netfs_limit_folioq()
215 	start_offset += iter->iov_offset;  in netfs_limit_folioq()
220 			span += flen - start_offset;  in netfs_limit_folioq()
224 			start_offset -= flen;  in netfs_limit_folioq()
231 			folioq = folioq->next;  in netfs_limit_folioq()