Lines Matching +full:min +full:- +full:len
1 // SPDX-License-Identifier: GPL-2.0-only
4 #include <linux/fault-inject-usercopy.h>
18 size_t len, void *from, void *priv2) in copy_to_user_iter() argument
21 return len; in copy_to_user_iter()
22 if (access_ok(iter_to, len)) { in copy_to_user_iter()
24 instrument_copy_to_user(iter_to, from, len); in copy_to_user_iter()
25 len = raw_copy_to_user(iter_to, from, len); in copy_to_user_iter()
27 return len; in copy_to_user_iter()
32 size_t len, void *from, void *priv2) in copy_to_user_iter_nofault() argument
37 return len; in copy_to_user_iter_nofault()
40 res = copy_to_user_nofault(iter_to, from, len); in copy_to_user_iter_nofault()
41 return res < 0 ? len : res; in copy_to_user_iter_nofault()
46 size_t len, void *to, void *priv2) in copy_from_user_iter() argument
48 size_t res = len; in copy_from_user_iter()
51 return len; in copy_from_user_iter()
52 if (access_ok(iter_from, len)) { in copy_from_user_iter()
54 instrument_copy_from_user_before(to, iter_from, len); in copy_from_user_iter()
55 res = raw_copy_from_user(to, iter_from, len); in copy_from_user_iter()
56 instrument_copy_from_user_after(to, iter_from, len, res); in copy_from_user_iter()
63 size_t len, void *from, void *priv2) in memcpy_to_iter() argument
65 memcpy(iter_to, from + progress, len); in memcpy_to_iter()
71 size_t len, void *to, void *priv2) in memcpy_from_iter() argument
73 memcpy(to + progress, iter_from, len); in memcpy_from_iter()
78 * fault_in_iov_iter_readable - fault in iov iterator for reading
88 * Always returns 0 for non-userspace iterators.
93 size_t n = min(size, iov_iter_count(i)); in fault_in_iov_iter_readable()
94 n -= fault_in_readable(i->ubuf + i->iov_offset, n); in fault_in_iov_iter_readable()
95 return size - n; in fault_in_iov_iter_readable()
97 size_t count = min(size, iov_iter_count(i)); in fault_in_iov_iter_readable()
101 size -= count; in fault_in_iov_iter_readable()
102 for (p = iter_iov(i), skip = i->iov_offset; count; p++, skip = 0) { in fault_in_iov_iter_readable()
103 size_t len = min(count, p->iov_len - skip); in fault_in_iov_iter_readable() local
106 if (unlikely(!len)) in fault_in_iov_iter_readable()
108 ret = fault_in_readable(p->iov_base + skip, len); in fault_in_iov_iter_readable()
109 count -= len - ret; in fault_in_iov_iter_readable()
120 * fault_in_iov_iter_writeable - fault in iov iterator for writing
131 * Always returns 0 for non-user-space iterators.
136 size_t n = min(size, iov_iter_count(i)); in fault_in_iov_iter_writeable()
137 n -= fault_in_safe_writeable(i->ubuf + i->iov_offset, n); in fault_in_iov_iter_writeable()
138 return size - n; in fault_in_iov_iter_writeable()
140 size_t count = min(size, iov_iter_count(i)); in fault_in_iov_iter_writeable()
144 size -= count; in fault_in_iov_iter_writeable()
145 for (p = iter_iov(i), skip = i->iov_offset; count; p++, skip = 0) { in fault_in_iov_iter_writeable()
146 size_t len = min(count, p->iov_len - skip); in fault_in_iov_iter_writeable() local
149 if (unlikely(!len)) in fault_in_iov_iter_writeable()
151 ret = fault_in_safe_writeable(p->iov_base + skip, len); in fault_in_iov_iter_writeable()
152 count -= len - ret; in fault_in_iov_iter_writeable()
181 if (WARN_ON_ONCE(i->data_source)) in _copy_to_iter()
193 size_t len, void *from, void *priv2) in copy_to_user_iter_mc() argument
195 if (access_ok(iter_to, len)) { in copy_to_user_iter_mc()
197 instrument_copy_to_user(iter_to, from, len); in copy_to_user_iter_mc()
198 len = copy_mc_to_user(iter_to, from, len); in copy_to_user_iter_mc()
200 return len; in copy_to_user_iter_mc()
205 size_t len, void *from, void *priv2) in memcpy_to_iter_mc() argument
207 return copy_mc_to_kernel(iter_to, from + progress, len); in memcpy_to_iter_mc()
211 * _copy_mc_to_iter - copy to iter with source memory error exception handling
217 * (dax_copy_to_iter()) for dax reads (bypass page-cache and the
218 * block-layer). Upon #MC read(2) aborts and returns EIO or the bytes
224 * byte-by-byte until the fault happens again. Re-triggering machine
226 * alignment and poison alignment assumptions to avoid re-triggering
236 if (WARN_ON_ONCE(i->data_source)) in _copy_mc_to_iter()
255 if (WARN_ON_ONCE(!i->data_source)) in _copy_from_iter()
266 size_t len, void *to, void *priv2) in copy_from_user_iter_nocache() argument
268 return __copy_from_user_inatomic_nocache(to + progress, iter_from, len); in copy_from_user_iter_nocache()
273 if (WARN_ON_ONCE(!i->data_source)) in _copy_from_iter_nocache()
285 size_t len, void *to, void *priv2) in copy_from_user_iter_flushcache() argument
287 return __copy_from_user_flushcache(to + progress, iter_from, len); in copy_from_user_iter_flushcache()
292 size_t len, void *to, void *priv2) in memcpy_from_iter_flushcache() argument
294 memcpy_flushcache(to + progress, iter_from, len); in memcpy_from_iter_flushcache()
299 * _copy_from_iter_flushcache - write destination through cpu cache
304 * The pmem driver arranges for filesystem-dax to use this facility via
310 * instructions that strand dirty-data in the cache.
316 if (WARN_ON_ONCE(!i->data_source)) in _copy_from_iter_flushcache()
334 * However, we mostly deal with order-0 pages and thus can in page_copy_sane()
342 v += (page - head) << PAGE_SHIFT; in page_copy_sane()
355 if (WARN_ON_ONCE(i->data_source)) in copy_page_to_iter()
361 size_t n = min(bytes, (size_t)PAGE_SIZE - offset); in copy_page_to_iter()
365 bytes -= n; in copy_page_to_iter()
385 if (WARN_ON_ONCE(i->data_source)) in copy_page_to_iter_nofault()
391 size_t n = min(bytes, (size_t)PAGE_SIZE - offset); in copy_page_to_iter_nofault()
398 bytes -= n; in copy_page_to_iter_nofault()
421 size_t n = min(bytes, (size_t)PAGE_SIZE - offset); in copy_page_from_iter()
425 bytes -= n; in copy_page_from_iter()
440 size_t len, void *priv, void *priv2) in zero_to_user_iter() argument
442 return clear_user(iter_to, len); in zero_to_user_iter()
447 size_t len, void *priv, void *priv2) in zero_to_iter() argument
449 memset(iter_to, 0, len); in zero_to_iter()
467 if (WARN_ON_ONCE(!i->data_source)) in copy_page_from_iter_atomic()
473 n = bytes - copied; in copy_page_from_iter_atomic()
477 n = min_t(size_t, n, PAGE_SIZE - offset); in copy_page_from_iter_atomic()
495 if (!i->count) in iov_iter_bvec_advance()
497 i->count -= size; in iov_iter_bvec_advance()
499 size += i->iov_offset; in iov_iter_bvec_advance()
501 for (bvec = i->bvec, end = bvec + i->nr_segs; bvec < end; bvec++) { in iov_iter_bvec_advance()
502 if (likely(size < bvec->bv_len)) in iov_iter_bvec_advance()
504 size -= bvec->bv_len; in iov_iter_bvec_advance()
506 i->iov_offset = size; in iov_iter_bvec_advance()
507 i->nr_segs -= bvec - i->bvec; in iov_iter_bvec_advance()
508 i->bvec = bvec; in iov_iter_bvec_advance()
515 if (!i->count) in iov_iter_iovec_advance()
517 i->count -= size; in iov_iter_iovec_advance()
519 size += i->iov_offset; // from beginning of current segment in iov_iter_iovec_advance()
520 for (iov = iter_iov(i), end = iov + i->nr_segs; iov < end; iov++) { in iov_iter_iovec_advance()
521 if (likely(size < iov->iov_len)) in iov_iter_iovec_advance()
523 size -= iov->iov_len; in iov_iter_iovec_advance()
525 i->iov_offset = size; in iov_iter_iovec_advance()
526 i->nr_segs -= iov - iter_iov(i); in iov_iter_iovec_advance()
527 i->__iov = iov; in iov_iter_iovec_advance()
532 if (unlikely(i->count < size)) in iov_iter_advance()
533 size = i->count; in iov_iter_advance()
535 i->iov_offset += size; in iov_iter_advance()
536 i->count -= size; in iov_iter_advance()
543 i->count -= size; in iov_iter_advance()
554 i->count += unroll; in iov_iter_revert()
557 if (unroll <= i->iov_offset) { in iov_iter_revert()
558 i->iov_offset -= unroll; in iov_iter_revert()
561 unroll -= i->iov_offset; in iov_iter_revert()
568 const struct bio_vec *bvec = i->bvec; in iov_iter_revert()
570 size_t n = (--bvec)->bv_len; in iov_iter_revert()
571 i->nr_segs++; in iov_iter_revert()
573 i->bvec = bvec; in iov_iter_revert()
574 i->iov_offset = n - unroll; in iov_iter_revert()
577 unroll -= n; in iov_iter_revert()
582 size_t n = (--iov)->iov_len; in iov_iter_revert()
583 i->nr_segs++; in iov_iter_revert()
585 i->__iov = iov; in iov_iter_revert()
586 i->iov_offset = n - unroll; in iov_iter_revert()
589 unroll -= n; in iov_iter_revert()
600 if (i->nr_segs > 1) { in iov_iter_single_seg_count()
602 return min(i->count, iter_iov(i)->iov_len - i->iov_offset); in iov_iter_single_seg_count()
604 return min(i->count, i->bvec->bv_len - i->iov_offset); in iov_iter_single_seg_count()
606 return i->count; in iov_iter_single_seg_count()
643 * iov_iter_xarray - Initialise an I/O iterator to use the pages in an xarray
671 * iov_iter_discard - Initialise an I/O iterator that discards data
694 size_t size = i->count; in iov_iter_aligned_iovec()
695 size_t skip = i->iov_offset; in iov_iter_aligned_iovec()
698 for (k = 0; k < i->nr_segs; k++, skip = 0) { in iov_iter_aligned_iovec()
700 size_t len = iov->iov_len - skip; in iov_iter_aligned_iovec() local
702 if (len > size) in iov_iter_aligned_iovec()
703 len = size; in iov_iter_aligned_iovec()
704 if (len & len_mask) in iov_iter_aligned_iovec()
706 if ((unsigned long)(iov->iov_base + skip) & addr_mask) in iov_iter_aligned_iovec()
709 size -= len; in iov_iter_aligned_iovec()
719 size_t size = i->count; in iov_iter_aligned_bvec()
720 unsigned skip = i->iov_offset; in iov_iter_aligned_bvec()
723 for (k = 0; k < i->nr_segs; k++, skip = 0) { in iov_iter_aligned_bvec()
724 size_t len = i->bvec[k].bv_len - skip; in iov_iter_aligned_bvec() local
726 if (len > size) in iov_iter_aligned_bvec()
727 len = size; in iov_iter_aligned_bvec()
728 if (len & len_mask) in iov_iter_aligned_bvec()
730 if ((unsigned long)(i->bvec[k].bv_offset + skip) & addr_mask) in iov_iter_aligned_bvec()
733 size -= len; in iov_iter_aligned_bvec()
741 * iov_iter_is_aligned() - Check if the addresses and lengths of each segments
754 if (i->count & len_mask) in iov_iter_is_aligned()
756 if ((unsigned long)(i->ubuf + i->iov_offset) & addr_mask) in iov_iter_is_aligned()
768 if (i->count & len_mask) in iov_iter_is_aligned()
770 if ((i->xarray_start + i->iov_offset) & addr_mask) in iov_iter_is_aligned()
781 size_t size = i->count; in iov_iter_alignment_iovec()
782 size_t skip = i->iov_offset; in iov_iter_alignment_iovec()
785 for (k = 0; k < i->nr_segs; k++, skip = 0) { in iov_iter_alignment_iovec()
787 size_t len = iov->iov_len - skip; in iov_iter_alignment_iovec() local
788 if (len) { in iov_iter_alignment_iovec()
789 res |= (unsigned long)iov->iov_base + skip; in iov_iter_alignment_iovec()
790 if (len > size) in iov_iter_alignment_iovec()
791 len = size; in iov_iter_alignment_iovec()
792 res |= len; in iov_iter_alignment_iovec()
793 size -= len; in iov_iter_alignment_iovec()
804 size_t size = i->count; in iov_iter_alignment_bvec()
805 unsigned skip = i->iov_offset; in iov_iter_alignment_bvec()
808 for (k = 0; k < i->nr_segs; k++, skip = 0) { in iov_iter_alignment_bvec()
809 size_t len = i->bvec[k].bv_len - skip; in iov_iter_alignment_bvec() local
810 res |= (unsigned long)i->bvec[k].bv_offset + skip; in iov_iter_alignment_bvec()
811 if (len > size) in iov_iter_alignment_bvec()
812 len = size; in iov_iter_alignment_bvec()
813 res |= len; in iov_iter_alignment_bvec()
814 size -= len; in iov_iter_alignment_bvec()
824 size_t size = i->count; in iov_iter_alignment()
826 return ((unsigned long)i->ubuf + i->iov_offset) | size; in iov_iter_alignment()
838 return (i->xarray_start + i->iov_offset) | i->count; in iov_iter_alignment()
848 size_t size = i->count; in iov_iter_gap_alignment()
857 for (k = 0; k < i->nr_segs; k++) { in iov_iter_gap_alignment()
859 if (iov->iov_len) { in iov_iter_gap_alignment()
860 unsigned long base = (unsigned long)iov->iov_base; in iov_iter_gap_alignment()
863 v = base + iov->iov_len; in iov_iter_gap_alignment()
864 if (size <= iov->iov_len) in iov_iter_gap_alignment()
866 size -= iov->iov_len; in iov_iter_gap_alignment()
924 pos = i->xarray_start + i->iov_offset; in iter_xarray_get_pages()
931 return -ENOMEM; in iter_xarray_get_pages()
932 nr = iter_xarray_populate_pages(*pages, i->xarray, index, count); in iter_xarray_get_pages()
936 maxsize = min_t(size_t, nr * PAGE_SIZE - offset, maxsize); in iter_xarray_get_pages()
937 i->iov_offset += maxsize; in iter_xarray_get_pages()
938 i->count -= maxsize; in iter_xarray_get_pages()
942 /* must be done on non-empty ITER_UBUF or ITER_IOVEC one */
949 return (unsigned long)i->ubuf + i->iov_offset; in first_iovec_segment()
951 for (k = 0, skip = i->iov_offset; k < i->nr_segs; k++, skip = 0) { in first_iovec_segment()
953 size_t len = iov->iov_len - skip; in first_iovec_segment() local
955 if (unlikely(!len)) in first_iovec_segment()
957 if (*size > len) in first_iovec_segment()
958 *size = len; in first_iovec_segment()
959 return (unsigned long)iov->iov_base + skip; in first_iovec_segment()
964 /* must be done on non-empty ITER_BVEC one */
969 size_t skip = i->iov_offset, len; in first_bvec_segment() local
971 len = i->bvec->bv_len - skip; in first_bvec_segment()
972 if (*size > len) in first_bvec_segment()
973 *size = len; in first_bvec_segment()
974 skip += i->bvec->bv_offset; in first_bvec_segment()
975 page = i->bvec->bv_page + skip / PAGE_SIZE; in first_bvec_segment()
986 if (maxsize > i->count) in __iov_iter_get_pages_alloc()
987 maxsize = i->count; in __iov_iter_get_pages_alloc()
999 if (i->nofault) in __iov_iter_get_pages_alloc()
1007 return -ENOMEM; in __iov_iter_get_pages_alloc()
1011 maxsize = min_t(size_t, maxsize, res * PAGE_SIZE - *start); in __iov_iter_get_pages_alloc()
1022 return -ENOMEM; in __iov_iter_get_pages_alloc()
1026 maxsize = min_t(size_t, maxsize, n * PAGE_SIZE - *start); in __iov_iter_get_pages_alloc()
1027 i->count -= maxsize; in __iov_iter_get_pages_alloc()
1028 i->iov_offset += maxsize; in __iov_iter_get_pages_alloc()
1029 if (i->iov_offset == i->bvec->bv_len) { in __iov_iter_get_pages_alloc()
1030 i->iov_offset = 0; in __iov_iter_get_pages_alloc()
1031 i->bvec++; in __iov_iter_get_pages_alloc()
1032 i->nr_segs--; in __iov_iter_get_pages_alloc()
1038 return -EFAULT; in __iov_iter_get_pages_alloc()
1055 ssize_t len; in iov_iter_get_pages_alloc2() local
1059 len = __iov_iter_get_pages_alloc(i, pages, maxsize, ~0U, start); in iov_iter_get_pages_alloc2()
1060 if (len <= 0) { in iov_iter_get_pages_alloc2()
1064 return len; in iov_iter_get_pages_alloc2()
1070 size_t skip = i->iov_offset, size = i->count; in iov_npages()
1075 unsigned offs = offset_in_page(p->iov_base + skip); in iov_npages()
1076 size_t len = min(p->iov_len - skip, size); in iov_npages() local
1078 if (len) { in iov_npages()
1079 size -= len; in iov_npages()
1080 npages += DIV_ROUND_UP(offs + len, PAGE_SIZE); in iov_npages()
1090 size_t skip = i->iov_offset, size = i->count; in bvec_npages()
1094 for (p = i->bvec; size; skip = 0, p++) { in bvec_npages()
1095 unsigned offs = (p->bv_offset + skip) % PAGE_SIZE; in bvec_npages()
1096 size_t len = min(p->bv_len - skip, size); in bvec_npages() local
1098 size -= len; in bvec_npages()
1099 npages += DIV_ROUND_UP(offs + len, PAGE_SIZE); in bvec_npages()
1108 if (unlikely(!i->count)) in iov_iter_npages()
1111 unsigned offs = offset_in_page(i->ubuf + i->iov_offset); in iov_iter_npages()
1112 int npages = DIV_ROUND_UP(offs + i->count, PAGE_SIZE); in iov_iter_npages()
1113 return min(npages, maxpages); in iov_iter_npages()
1121 unsigned offset = (i->xarray_start + i->iov_offset) % PAGE_SIZE; in iov_iter_npages()
1122 int npages = DIV_ROUND_UP(offset + i->count, PAGE_SIZE); in iov_iter_npages()
1123 return min(npages, maxpages); in iov_iter_npages()
1133 return new->bvec = kmemdup(new->bvec, in dup_iter()
1134 new->nr_segs * sizeof(struct bio_vec), in dup_iter()
1138 return new->__iov = kmemdup(new->__iov, in dup_iter()
1139 new->nr_segs * sizeof(struct iovec), in dup_iter()
1150 int ret = -EFAULT, i; in copy_compat_iovec_from_user()
1153 return -EFAULT; in copy_compat_iovec_from_user()
1157 compat_ssize_t len; in copy_compat_iovec_from_user() local
1159 unsafe_get_user(len, &uiov[i].iov_len, uaccess_end); in copy_compat_iovec_from_user()
1163 if (len < 0) { in copy_compat_iovec_from_user()
1164 ret = -EINVAL; in copy_compat_iovec_from_user()
1168 iov[i].iov_len = len; in copy_compat_iovec_from_user()
1180 int ret = -EFAULT; in copy_iovec_from_user()
1183 return -EFAULT; in copy_iovec_from_user()
1187 ssize_t len; in copy_iovec_from_user() local
1189 unsafe_get_user(len, &uiov->iov_len, uaccess_end); in copy_iovec_from_user()
1190 unsafe_get_user(buf, &uiov->iov_base, uaccess_end); in copy_iovec_from_user()
1193 if (unlikely(len < 0)) { in copy_iovec_from_user()
1194 ret = -EINVAL; in copy_iovec_from_user()
1197 iov->iov_base = buf; in copy_iovec_from_user()
1198 iov->iov_len = len; in copy_iovec_from_user()
1201 } while (--nr_segs); in copy_iovec_from_user()
1224 return ERR_PTR(-EINVAL); in iovec_from_user()
1228 return ERR_PTR(-ENOMEM); in iovec_from_user()
1261 ret = import_ubuf(type, iov->iov_base, iov->iov_len, i); in __import_iovec_ubuf()
1265 return i->count; in __import_iovec_ubuf()
1294 ssize_t len = (ssize_t)iov[seg].iov_len; in __import_iovec() local
1296 if (!access_ok(iov[seg].iov_base, len)) { in __import_iovec()
1300 return -EFAULT; in __import_iovec()
1303 if (len > MAX_RW_COUNT - total_len) { in __import_iovec()
1304 len = MAX_RW_COUNT - total_len; in __import_iovec()
1305 iov[seg].iov_len = len; in __import_iovec()
1307 total_len += len; in __import_iovec()
1319 * import_iovec() - Copy an array of &struct iovec from userspace
1328 * on-stack) kernel array.
1335 * on-stack array was used or not (and regardless of whether this function
1349 int import_ubuf(int rw, void __user *buf, size_t len, struct iov_iter *i) in import_ubuf() argument
1351 if (len > MAX_RW_COUNT) in import_ubuf()
1352 len = MAX_RW_COUNT; in import_ubuf()
1353 if (unlikely(!access_ok(buf, len))) in import_ubuf()
1354 return -EFAULT; in import_ubuf()
1356 iov_iter_ubuf(i, rw, buf, len); in import_ubuf()
1362 * iov_iter_restore() - Restore a &struct iov_iter to the same state as when
1378 i->iov_offset = state->iov_offset; in iov_iter_restore()
1379 i->count = state->count; in iov_iter_restore()
1383 * For the *vec iters, nr_segs + iov is constant - if we increment in iov_iter_restore()
1393 i->bvec -= state->nr_segs - i->nr_segs; in iov_iter_restore()
1395 i->__iov -= state->nr_segs - i->nr_segs; in iov_iter_restore()
1396 i->nr_segs = state->nr_segs; in iov_iter_restore()
1411 loff_t pos = i->xarray_start + i->iov_offset; in iov_iter_extract_xarray_pages()
1413 XA_STATE(xas, i->xarray, index); in iov_iter_extract_xarray_pages()
1420 return -ENOMEM; in iov_iter_extract_xarray_pages()
1440 maxsize = min_t(size_t, nr * PAGE_SIZE - offset, maxsize); in iov_iter_extract_xarray_pages()
1456 size_t skip = i->iov_offset, offset, size; in iov_iter_extract_bvec_pages()
1460 if (i->nr_segs == 0) in iov_iter_extract_bvec_pages()
1462 size = min(maxsize, i->bvec->bv_len - skip); in iov_iter_extract_bvec_pages()
1465 i->iov_offset = 0; in iov_iter_extract_bvec_pages()
1466 i->nr_segs--; in iov_iter_extract_bvec_pages()
1467 i->bvec++; in iov_iter_extract_bvec_pages()
1471 skip += i->bvec->bv_offset; in iov_iter_extract_bvec_pages()
1472 page = i->bvec->bv_page + skip / PAGE_SIZE; in iov_iter_extract_bvec_pages()
1478 return -ENOMEM; in iov_iter_extract_bvec_pages()
1483 size = min_t(size_t, size, maxpages * PAGE_SIZE - offset); in iov_iter_extract_bvec_pages()
1500 size_t skip = i->iov_offset, offset, len, size; in iov_iter_extract_kvec_pages() local
1504 if (i->nr_segs == 0) in iov_iter_extract_kvec_pages()
1506 size = min(maxsize, i->kvec->iov_len - skip); in iov_iter_extract_kvec_pages()
1509 i->iov_offset = 0; in iov_iter_extract_kvec_pages()
1510 i->nr_segs--; in iov_iter_extract_kvec_pages()
1511 i->kvec++; in iov_iter_extract_kvec_pages()
1515 kaddr = i->kvec->iov_base + skip; in iov_iter_extract_kvec_pages()
1521 return -ENOMEM; in iov_iter_extract_kvec_pages()
1524 kaddr -= offset; in iov_iter_extract_kvec_pages()
1525 len = offset + size; in iov_iter_extract_kvec_pages()
1527 size_t seg = min_t(size_t, len, PAGE_SIZE); in iov_iter_extract_kvec_pages()
1535 len -= seg; in iov_iter_extract_kvec_pages()
1539 size = min_t(size_t, size, maxpages * PAGE_SIZE - offset); in iov_iter_extract_kvec_pages()
1546 * each of them. This should only be used if the iterator is user-backed
1568 if (i->data_source == ITER_DEST) in iov_iter_extract_user_pages()
1572 if (i->nofault) in iov_iter_extract_user_pages()
1580 return -ENOMEM; in iov_iter_extract_user_pages()
1584 maxsize = min_t(size_t, maxsize, res * PAGE_SIZE - offset); in iov_iter_extract_user_pages()
1590 * iov_iter_extract_pages - Extract a list of contiguous pages from an iterator
1607 * @extraction_flags can have ITER_ALLOW_P2PDMA set to request peer-to-peer DMA
1615 * (*) If the iterator is user-backed (ITER_IOVEC/ITER_UBUF), pins will be
1630 * It may also return -ENOMEM and -EFAULT.
1639 maxsize = min_t(size_t, min_t(size_t, maxsize, i->count), MAX_RW_COUNT); in iov_iter_extract_pages()
1659 return -EFAULT; in iov_iter_extract_pages()