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lib/iov_iter.c
44.2 KB
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// SPDX-License-Identifier: GPL-2.0-only |
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#include <crypto/hash.h> |
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#include <linux/export.h> |
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#include <linux/bvec.h> |
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#include <linux/fault-inject-usercopy.h> |
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#include <linux/uio.h> #include <linux/pagemap.h> |
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#include <linux/slab.h> #include <linux/vmalloc.h> |
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#include <linux/splice.h> |
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#include <linux/compat.h> |
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#include <net/checksum.h> |
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#include <linux/scatterlist.h> |
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#include <linux/instrumented.h> |
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|
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#define PIPE_PARANOIA /* for now */ |
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#define iterate_iovec(i, n, __v, __p, skip, STEP) { \ size_t left; \ size_t wanted = n; \ __p = i->iov; \ __v.iov_len = min(n, __p->iov_len - skip); \ if (likely(__v.iov_len)) { \ __v.iov_base = __p->iov_base + skip; \ left = (STEP); \ __v.iov_len -= left; \ skip += __v.iov_len; \ n -= __v.iov_len; \ } else { \ left = 0; \ } \ while (unlikely(!left && n)) { \ __p++; \ __v.iov_len = min(n, __p->iov_len); \ if (unlikely(!__v.iov_len)) \ continue; \ __v.iov_base = __p->iov_base; \ left = (STEP); \ __v.iov_len -= left; \ skip = __v.iov_len; \ n -= __v.iov_len; \ } \ n = wanted - n; \ } |
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#define iterate_kvec(i, n, __v, __p, skip, STEP) { \ size_t wanted = n; \ __p = i->kvec; \ __v.iov_len = min(n, __p->iov_len - skip); \ if (likely(__v.iov_len)) { \ __v.iov_base = __p->iov_base + skip; \ (void)(STEP); \ skip += __v.iov_len; \ n -= __v.iov_len; \ } \ while (unlikely(n)) { \ __p++; \ __v.iov_len = min(n, __p->iov_len); \ if (unlikely(!__v.iov_len)) \ continue; \ __v.iov_base = __p->iov_base; \ (void)(STEP); \ skip = __v.iov_len; \ n -= __v.iov_len; \ } \ n = wanted; \ } |
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#define iterate_bvec(i, n, __v, __bi, skip, STEP) { \ struct bvec_iter __start; \ __start.bi_size = n; \ __start.bi_bvec_done = skip; \ __start.bi_idx = 0; \ for_each_bvec(__v, i->bvec, __bi, __start) { \ if (!__v.bv_len) \ |
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continue; \ |
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(void)(STEP); \ |
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} \ |
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} |
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#define iterate_all_kinds(i, n, v, I, B, K) { \ |
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if (likely(n)) { \ size_t skip = i->iov_offset; \ if (unlikely(i->type & ITER_BVEC)) { \ struct bio_vec v; \ struct bvec_iter __bi; \ iterate_bvec(i, n, v, __bi, skip, (B)) \ } else if (unlikely(i->type & ITER_KVEC)) { \ const struct kvec *kvec; \ struct kvec v; \ iterate_kvec(i, n, v, kvec, skip, (K)) \ |
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} else if (unlikely(i->type & ITER_DISCARD)) { \ |
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} else { \ const struct iovec *iov; \ struct iovec v; \ iterate_iovec(i, n, v, iov, skip, (I)) \ } \ |
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} \ } |
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#define iterate_and_advance(i, n, v, I, B, K) { \ |
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if (unlikely(i->count < n)) \ n = i->count; \ |
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if (i->count) { \ |
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size_t skip = i->iov_offset; \ if (unlikely(i->type & ITER_BVEC)) { \ |
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const struct bio_vec *bvec = i->bvec; \ |
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struct bio_vec v; \ |
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struct bvec_iter __bi; \ iterate_bvec(i, n, v, __bi, skip, (B)) \ i->bvec = __bvec_iter_bvec(i->bvec, __bi); \ i->nr_segs -= i->bvec - bvec; \ skip = __bi.bi_bvec_done; \ |
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} else if (unlikely(i->type & ITER_KVEC)) { \ const struct kvec *kvec; \ struct kvec v; \ iterate_kvec(i, n, v, kvec, skip, (K)) \ if (skip == kvec->iov_len) { \ kvec++; \ skip = 0; \ } \ i->nr_segs -= kvec - i->kvec; \ i->kvec = kvec; \ |
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} else if (unlikely(i->type & ITER_DISCARD)) { \ skip += n; \ |
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} else { \ const struct iovec *iov; \ struct iovec v; \ iterate_iovec(i, n, v, iov, skip, (I)) \ if (skip == iov->iov_len) { \ iov++; \ skip = 0; \ } \ i->nr_segs -= iov - i->iov; \ i->iov = iov; \ |
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} \ |
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i->count -= n; \ i->iov_offset = skip; \ |
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} \ |
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} |
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static int copyout(void __user *to, const void *from, size_t n) { |
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if (should_fail_usercopy()) return n; |
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if (access_ok(to, n)) { |
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instrument_copy_to_user(to, from, n); |
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n = raw_copy_to_user(to, from, n); } return n; } static int copyin(void *to, const void __user *from, size_t n) { |
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if (should_fail_usercopy()) return n; |
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if (access_ok(from, n)) { |
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instrument_copy_from_user(to, from, n); |
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n = raw_copy_from_user(to, from, n); } return n; } |
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static size_t copy_page_to_iter_iovec(struct page *page, size_t offset, size_t bytes, |
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struct iov_iter *i) { size_t skip, copy, left, wanted; const struct iovec *iov; char __user *buf; void *kaddr, *from; if (unlikely(bytes > i->count)) bytes = i->count; if (unlikely(!bytes)) return 0; |
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might_fault(); |
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wanted = bytes; iov = i->iov; skip = i->iov_offset; buf = iov->iov_base + skip; copy = min(bytes, iov->iov_len - skip); |
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if (IS_ENABLED(CONFIG_HIGHMEM) && !fault_in_pages_writeable(buf, copy)) { |
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kaddr = kmap_atomic(page); from = kaddr + offset; /* first chunk, usually the only one */ |
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left = copyout(buf, from, copy); |
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copy -= left; skip += copy; from += copy; bytes -= copy; while (unlikely(!left && bytes)) { iov++; buf = iov->iov_base; copy = min(bytes, iov->iov_len); |
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left = copyout(buf, from, copy); |
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copy -= left; skip = copy; from += copy; bytes -= copy; } if (likely(!bytes)) { kunmap_atomic(kaddr); goto done; } offset = from - kaddr; buf += copy; kunmap_atomic(kaddr); copy = min(bytes, iov->iov_len - skip); } /* Too bad - revert to non-atomic kmap */ |
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|
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kaddr = kmap(page); from = kaddr + offset; |
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left = copyout(buf, from, copy); |
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copy -= left; skip += copy; from += copy; bytes -= copy; while (unlikely(!left && bytes)) { iov++; buf = iov->iov_base; copy = min(bytes, iov->iov_len); |
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left = copyout(buf, from, copy); |
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copy -= left; skip = copy; from += copy; bytes -= copy; } kunmap(page); |
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|
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done: |
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if (skip == iov->iov_len) { iov++; skip = 0; } |
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i->count -= wanted - bytes; i->nr_segs -= iov - i->iov; i->iov = iov; i->iov_offset = skip; return wanted - bytes; } |
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static size_t copy_page_from_iter_iovec(struct page *page, size_t offset, size_t bytes, |
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struct iov_iter *i) { size_t skip, copy, left, wanted; const struct iovec *iov; char __user *buf; void *kaddr, *to; if (unlikely(bytes > i->count)) bytes = i->count; if (unlikely(!bytes)) return 0; |
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might_fault(); |
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wanted = bytes; iov = i->iov; skip = i->iov_offset; buf = iov->iov_base + skip; copy = min(bytes, iov->iov_len - skip); |
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if (IS_ENABLED(CONFIG_HIGHMEM) && !fault_in_pages_readable(buf, copy)) { |
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kaddr = kmap_atomic(page); to = kaddr + offset; /* first chunk, usually the only one */ |
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left = copyin(to, buf, copy); |
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copy -= left; skip += copy; to += copy; bytes -= copy; while (unlikely(!left && bytes)) { iov++; buf = iov->iov_base; copy = min(bytes, iov->iov_len); |
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left = copyin(to, buf, copy); |
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copy -= left; skip = copy; to += copy; bytes -= copy; } if (likely(!bytes)) { kunmap_atomic(kaddr); goto done; } offset = to - kaddr; buf += copy; kunmap_atomic(kaddr); copy = min(bytes, iov->iov_len - skip); } /* Too bad - revert to non-atomic kmap */ |
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|
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kaddr = kmap(page); to = kaddr + offset; |
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left = copyin(to, buf, copy); |
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copy -= left; skip += copy; to += copy; bytes -= copy; while (unlikely(!left && bytes)) { iov++; buf = iov->iov_base; copy = min(bytes, iov->iov_len); |
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left = copyin(to, buf, copy); |
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copy -= left; skip = copy; to += copy; bytes -= copy; } kunmap(page); |
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|
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done: |
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if (skip == iov->iov_len) { iov++; skip = 0; } |
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i->count -= wanted - bytes; i->nr_segs -= iov - i->iov; i->iov = iov; i->iov_offset = skip; return wanted - bytes; } |
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#ifdef PIPE_PARANOIA static bool sanity(const struct iov_iter *i) { struct pipe_inode_info *pipe = i->pipe; |
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unsigned int p_head = pipe->head; unsigned int p_tail = pipe->tail; unsigned int p_mask = pipe->ring_size - 1; unsigned int p_occupancy = pipe_occupancy(p_head, p_tail); unsigned int i_head = i->head; unsigned int idx; |
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if (i->iov_offset) { struct pipe_buffer *p; |
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if (unlikely(p_occupancy == 0)) |
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goto Bad; // pipe must be non-empty |
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if (unlikely(i_head != p_head - 1)) |
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goto Bad; // must be at the last buffer... |
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p = &pipe->bufs[i_head & p_mask]; |
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if (unlikely(p->offset + p->len != i->iov_offset)) goto Bad; // ... at the end of segment } else { |
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if (i_head != p_head) |
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goto Bad; // must be right after the last buffer } return true; Bad: |
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printk(KERN_ERR "idx = %d, offset = %zd ", i_head, i->iov_offset); printk(KERN_ERR "head = %d, tail = %d, buffers = %d ", p_head, p_tail, pipe->ring_size); for (idx = 0; idx < pipe->ring_size; idx++) |
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printk(KERN_ERR "[%p %p %d %d] ", pipe->bufs[idx].ops, pipe->bufs[idx].page, pipe->bufs[idx].offset, pipe->bufs[idx].len); WARN_ON(1); return false; } #else #define sanity(i) true #endif |
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static size_t copy_page_to_iter_pipe(struct page *page, size_t offset, size_t bytes, struct iov_iter *i) { struct pipe_inode_info *pipe = i->pipe; struct pipe_buffer *buf; |
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unsigned int p_tail = pipe->tail; unsigned int p_mask = pipe->ring_size - 1; unsigned int i_head = i->head; |
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size_t off; |
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if (unlikely(bytes > i->count)) bytes = i->count; if (unlikely(!bytes)) return 0; if (!sanity(i)) return 0; off = i->iov_offset; |
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buf = &pipe->bufs[i_head & p_mask]; |
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if (off) { if (offset == off && buf->page == page) { /* merge with the last one */ buf->len += bytes; i->iov_offset += bytes; goto out; } |
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i_head++; buf = &pipe->bufs[i_head & p_mask]; |
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} |
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if (pipe_full(i_head, p_tail, pipe->max_usage)) |
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return 0; |
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|
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buf->ops = &page_cache_pipe_buf_ops; |
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get_page(page); buf->page = page; |
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buf->offset = offset; buf->len = bytes; |
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pipe->head = i_head + 1; |
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i->iov_offset = offset + bytes; |
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i->head = i_head; |
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out: i->count -= bytes; return bytes; } |
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/* |
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* Fault in one or more iovecs of the given iov_iter, to a maximum length of * bytes. For each iovec, fault in each page that constitutes the iovec. * * Return 0 on success, or non-zero if the memory could not be accessed (i.e. * because it is an invalid address). */ |
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int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes) |
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{ size_t skip = i->iov_offset; const struct iovec *iov; int err; struct iovec v; if (!(i->type & (ITER_BVEC|ITER_KVEC))) { iterate_iovec(i, bytes, v, iov, skip, ({ |
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err = fault_in_pages_readable(v.iov_base, v.iov_len); |
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if (unlikely(err)) return err; 0;})) } return 0; } |
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EXPORT_SYMBOL(iov_iter_fault_in_readable); |
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|
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void iov_iter_init(struct iov_iter *i, unsigned int direction, |
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const struct iovec *iov, unsigned long nr_segs, size_t count) { |
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WARN_ON(direction & ~(READ | WRITE)); direction &= READ | WRITE; |
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/* It will get better. Eventually... */ |
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if (uaccess_kernel()) { |
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i->type = ITER_KVEC | direction; |
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i->kvec = (struct kvec *)iov; } else { |
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i->type = ITER_IOVEC | direction; |
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i->iov = iov; } |
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i->nr_segs = nr_segs; i->iov_offset = 0; i->count = count; } EXPORT_SYMBOL(iov_iter_init); |
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static void memcpy_from_page(char *to, struct page *page, size_t offset, size_t len) { char *from = kmap_atomic(page); memcpy(to, from + offset, len); kunmap_atomic(from); } |
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static void memcpy_to_page(struct page *page, size_t offset, const char *from, size_t len) |
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{ char *to = kmap_atomic(page); memcpy(to + offset, from, len); kunmap_atomic(to); } |
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static void memzero_page(struct page *page, size_t offset, size_t len) { char *addr = kmap_atomic(page); memset(addr + offset, 0, len); kunmap_atomic(addr); } |
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static inline bool allocated(struct pipe_buffer *buf) { return buf->ops == &default_pipe_buf_ops; } |
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static inline void data_start(const struct iov_iter *i, unsigned int *iter_headp, size_t *offp) |
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{ |
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unsigned int p_mask = i->pipe->ring_size - 1; unsigned int iter_head = i->head; |
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size_t off = i->iov_offset; |
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if (off && (!allocated(&i->pipe->bufs[iter_head & p_mask]) || off == PAGE_SIZE)) { iter_head++; |
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off = 0; } |
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*iter_headp = iter_head; |
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*offp = off; } static size_t push_pipe(struct iov_iter *i, size_t size, |
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int *iter_headp, size_t *offp) |
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{ struct pipe_inode_info *pipe = i->pipe; |
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unsigned int p_tail = pipe->tail; unsigned int p_mask = pipe->ring_size - 1; unsigned int iter_head; |
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size_t off; |
241699cd7 new iov_iter flav... |
502 503 504 505 506 507 508 509 |
ssize_t left; if (unlikely(size > i->count)) size = i->count; if (unlikely(!size)) return 0; left = size; |
8cefc107c pipe: Use head an... |
510 511 |
data_start(i, &iter_head, &off); *iter_headp = iter_head; |
241699cd7 new iov_iter flav... |
512 513 514 515 |
*offp = off; if (off) { left -= PAGE_SIZE - off; if (left <= 0) { |
8cefc107c pipe: Use head an... |
516 |
pipe->bufs[iter_head & p_mask].len += size; |
241699cd7 new iov_iter flav... |
517 518 |
return size; } |
8cefc107c pipe: Use head an... |
519 520 |
pipe->bufs[iter_head & p_mask].len = PAGE_SIZE; iter_head++; |
241699cd7 new iov_iter flav... |
521 |
} |
6718b6f85 pipe: Allow pipes... |
522 |
while (!pipe_full(iter_head, p_tail, pipe->max_usage)) { |
8cefc107c pipe: Use head an... |
523 |
struct pipe_buffer *buf = &pipe->bufs[iter_head & p_mask]; |
241699cd7 new iov_iter flav... |
524 525 526 |
struct page *page = alloc_page(GFP_USER); if (!page) break; |
8cefc107c pipe: Use head an... |
527 528 529 530 531 532 533 534 535 536 |
buf->ops = &default_pipe_buf_ops; buf->page = page; buf->offset = 0; buf->len = min_t(ssize_t, left, PAGE_SIZE); left -= buf->len; iter_head++; pipe->head = iter_head; if (left == 0) |
241699cd7 new iov_iter flav... |
537 |
return size; |
241699cd7 new iov_iter flav... |
538 539 540 541 542 543 544 545 |
} return size - left; } static size_t copy_pipe_to_iter(const void *addr, size_t bytes, struct iov_iter *i) { struct pipe_inode_info *pipe = i->pipe; |
8cefc107c pipe: Use head an... |
546 547 |
unsigned int p_mask = pipe->ring_size - 1; unsigned int i_head; |
241699cd7 new iov_iter flav... |
548 |
size_t n, off; |
241699cd7 new iov_iter flav... |
549 550 551 |
if (!sanity(i)) return 0; |
8cefc107c pipe: Use head an... |
552 |
bytes = n = push_pipe(i, bytes, &i_head, &off); |
241699cd7 new iov_iter flav... |
553 554 |
if (unlikely(!n)) return 0; |
8cefc107c pipe: Use head an... |
555 |
do { |
241699cd7 new iov_iter flav... |
556 |
size_t chunk = min_t(size_t, n, PAGE_SIZE - off); |
8cefc107c pipe: Use head an... |
557 558 |
memcpy_to_page(pipe->bufs[i_head & p_mask].page, off, addr, chunk); i->head = i_head; |
241699cd7 new iov_iter flav... |
559 560 561 |
i->iov_offset = off + chunk; n -= chunk; addr += chunk; |
8cefc107c pipe: Use head an... |
562 563 564 |
off = 0; i_head++; } while (n); |
241699cd7 new iov_iter flav... |
565 566 567 |
i->count -= bytes; return bytes; } |
f91528955 iov_iter: reduce ... |
568 569 570 |
static __wsum csum_and_memcpy(void *to, const void *from, size_t len, __wsum sum, size_t off) { |
cc44c17ba csum_partial_copy... |
571 |
__wsum next = csum_partial_copy_nocheck(from, to, len); |
f91528955 iov_iter: reduce ... |
572 573 |
return csum_block_add(sum, next, off); } |
78e1f3861 iov_iter: teach c... |
574 575 576 577 |
static size_t csum_and_copy_to_pipe_iter(const void *addr, size_t bytes, __wsum *csum, struct iov_iter *i) { struct pipe_inode_info *pipe = i->pipe; |
8cefc107c pipe: Use head an... |
578 579 |
unsigned int p_mask = pipe->ring_size - 1; unsigned int i_head; |
78e1f3861 iov_iter: teach c... |
580 581 |
size_t n, r; size_t off = 0; |
f91528955 iov_iter: reduce ... |
582 |
__wsum sum = *csum; |
78e1f3861 iov_iter: teach c... |
583 584 585 |
if (!sanity(i)) return 0; |
8cefc107c pipe: Use head an... |
586 |
bytes = n = push_pipe(i, bytes, &i_head, &r); |
78e1f3861 iov_iter: teach c... |
587 588 |
if (unlikely(!n)) return 0; |
8cefc107c pipe: Use head an... |
589 |
do { |
78e1f3861 iov_iter: teach c... |
590 |
size_t chunk = min_t(size_t, n, PAGE_SIZE - r); |
8cefc107c pipe: Use head an... |
591 |
char *p = kmap_atomic(pipe->bufs[i_head & p_mask].page); |
f91528955 iov_iter: reduce ... |
592 |
sum = csum_and_memcpy(p + r, addr, chunk, sum, off); |
78e1f3861 iov_iter: teach c... |
593 |
kunmap_atomic(p); |
8cefc107c pipe: Use head an... |
594 |
i->head = i_head; |
78e1f3861 iov_iter: teach c... |
595 596 597 598 |
i->iov_offset = r + chunk; n -= chunk; off += chunk; addr += chunk; |
8cefc107c pipe: Use head an... |
599 600 601 |
r = 0; i_head++; } while (n); |
78e1f3861 iov_iter: teach c... |
602 603 604 605 |
i->count -= bytes; *csum = sum; return bytes; } |
aa28de275 iov_iter/hardenin... |
606 |
size_t _copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i) |
62a8067a7 bio_vec-backed io... |
607 |
{ |
36f7a8a4c iov_iter: constif... |
608 |
const char *from = addr; |
00e237074 iov_iter: Use acc... |
609 |
if (unlikely(iov_iter_is_pipe(i))) |
241699cd7 new iov_iter flav... |
610 |
return copy_pipe_to_iter(addr, bytes, i); |
09fc68dc6 iov_iter: saner c... |
611 612 |
if (iter_is_iovec(i)) might_fault(); |
3d4d3e482 iov_iter.c: conve... |
613 |
iterate_and_advance(i, bytes, v, |
09fc68dc6 iov_iter: saner c... |
614 |
copyout(v.iov_base, (from += v.iov_len) - v.iov_len, v.iov_len), |
3d4d3e482 iov_iter.c: conve... |
615 |
memcpy_to_page(v.bv_page, v.bv_offset, |
a280455fa iov_iter.c: handl... |
616 617 |
(from += v.bv_len) - v.bv_len, v.bv_len), memcpy(v.iov_base, (from += v.iov_len) - v.iov_len, v.iov_len) |
3d4d3e482 iov_iter.c: conve... |
618 |
) |
62a8067a7 bio_vec-backed io... |
619 |
|
3d4d3e482 iov_iter.c: conve... |
620 |
return bytes; |
c35e02480 Add copy_to_iter(... |
621 |
} |
aa28de275 iov_iter/hardenin... |
622 |
EXPORT_SYMBOL(_copy_to_iter); |
c35e02480 Add copy_to_iter(... |
623 |
|
ec6347bb4 x86, powerpc: Ren... |
624 625 |
#ifdef CONFIG_ARCH_HAS_COPY_MC static int copyout_mc(void __user *to, const void *from, size_t n) |
8780356ef x86/asm/memcpy_mc... |
626 |
{ |
96d4f267e Remove 'type' arg... |
627 |
if (access_ok(to, n)) { |
d0ef4c360 iov_iter: Use gen... |
628 |
instrument_copy_to_user(to, from, n); |
ec6347bb4 x86, powerpc: Ren... |
629 |
n = copy_mc_to_user((__force void *) to, from, n); |
8780356ef x86/asm/memcpy_mc... |
630 631 632 |
} return n; } |
ec6347bb4 x86, powerpc: Ren... |
633 |
static unsigned long copy_mc_to_page(struct page *page, size_t offset, |
8780356ef x86/asm/memcpy_mc... |
634 635 636 637 638 639 |
const char *from, size_t len) { unsigned long ret; char *to; to = kmap_atomic(page); |
ec6347bb4 x86, powerpc: Ren... |
640 |
ret = copy_mc_to_kernel(to + offset, from, len); |
8780356ef x86/asm/memcpy_mc... |
641 642 643 644 |
kunmap_atomic(to); return ret; } |
ec6347bb4 x86, powerpc: Ren... |
645 |
static size_t copy_mc_pipe_to_iter(const void *addr, size_t bytes, |
ca146f6f0 lib/iov_iter: Fix... |
646 647 648 |
struct iov_iter *i) { struct pipe_inode_info *pipe = i->pipe; |
8cefc107c pipe: Use head an... |
649 650 |
unsigned int p_mask = pipe->ring_size - 1; unsigned int i_head; |
ca146f6f0 lib/iov_iter: Fix... |
651 |
size_t n, off, xfer = 0; |
ca146f6f0 lib/iov_iter: Fix... |
652 653 654 |
if (!sanity(i)) return 0; |
8cefc107c pipe: Use head an... |
655 |
bytes = n = push_pipe(i, bytes, &i_head, &off); |
ca146f6f0 lib/iov_iter: Fix... |
656 657 |
if (unlikely(!n)) return 0; |
8cefc107c pipe: Use head an... |
658 |
do { |
ca146f6f0 lib/iov_iter: Fix... |
659 660 |
size_t chunk = min_t(size_t, n, PAGE_SIZE - off); unsigned long rem; |
ec6347bb4 x86, powerpc: Ren... |
661 |
rem = copy_mc_to_page(pipe->bufs[i_head & p_mask].page, |
8cefc107c pipe: Use head an... |
662 663 |
off, addr, chunk); i->head = i_head; |
ca146f6f0 lib/iov_iter: Fix... |
664 665 666 667 668 669 |
i->iov_offset = off + chunk - rem; xfer += chunk - rem; if (rem) break; n -= chunk; addr += chunk; |
8cefc107c pipe: Use head an... |
670 671 672 |
off = 0; i_head++; } while (n); |
ca146f6f0 lib/iov_iter: Fix... |
673 674 675 |
i->count -= xfer; return xfer; } |
bf3eeb9b5 lib/iov_iter: Doc... |
676 |
/** |
ec6347bb4 x86, powerpc: Ren... |
677 |
* _copy_mc_to_iter - copy to iter with source memory error exception handling |
bf3eeb9b5 lib/iov_iter: Doc... |
678 679 680 681 |
* @addr: source kernel address * @bytes: total transfer length * @iter: destination iterator * |
ec6347bb4 x86, powerpc: Ren... |
682 683 684 685 |
* The pmem driver deploys this for the dax operation * (dax_copy_to_iter()) for dax reads (bypass page-cache and the * block-layer). Upon #MC read(2) aborts and returns EIO or the bytes * successfully copied. |
bf3eeb9b5 lib/iov_iter: Doc... |
686 |
* |
ec6347bb4 x86, powerpc: Ren... |
687 |
* The main differences between this and typical _copy_to_iter(). |
bf3eeb9b5 lib/iov_iter: Doc... |
688 689 690 691 692 693 694 695 696 697 |
* * * Typical tail/residue handling after a fault retries the copy * byte-by-byte until the fault happens again. Re-triggering machine * checks is potentially fatal so the implementation uses source * alignment and poison alignment assumptions to avoid re-triggering * hardware exceptions. * * * ITER_KVEC, ITER_PIPE, and ITER_BVEC can return short copies. * Compare to copy_to_iter() where only ITER_IOVEC attempts might return * a short copy. |
bf3eeb9b5 lib/iov_iter: Doc... |
698 |
*/ |
ec6347bb4 x86, powerpc: Ren... |
699 |
size_t _copy_mc_to_iter(const void *addr, size_t bytes, struct iov_iter *i) |
8780356ef x86/asm/memcpy_mc... |
700 701 702 |
{ const char *from = addr; unsigned long rem, curr_addr, s_addr = (unsigned long) addr; |
00e237074 iov_iter: Use acc... |
703 |
if (unlikely(iov_iter_is_pipe(i))) |
ec6347bb4 x86, powerpc: Ren... |
704 |
return copy_mc_pipe_to_iter(addr, bytes, i); |
8780356ef x86/asm/memcpy_mc... |
705 706 707 |
if (iter_is_iovec(i)) might_fault(); iterate_and_advance(i, bytes, v, |
ec6347bb4 x86, powerpc: Ren... |
708 709 |
copyout_mc(v.iov_base, (from += v.iov_len) - v.iov_len, v.iov_len), |
8780356ef x86/asm/memcpy_mc... |
710 |
({ |
ec6347bb4 x86, powerpc: Ren... |
711 712 |
rem = copy_mc_to_page(v.bv_page, v.bv_offset, (from += v.bv_len) - v.bv_len, v.bv_len); |
8780356ef x86/asm/memcpy_mc... |
713 714 715 716 717 718 719 |
if (rem) { curr_addr = (unsigned long) from; bytes = curr_addr - s_addr - rem; return bytes; } }), ({ |
ec6347bb4 x86, powerpc: Ren... |
720 721 |
rem = copy_mc_to_kernel(v.iov_base, (from += v.iov_len) - v.iov_len, v.iov_len); |
8780356ef x86/asm/memcpy_mc... |
722 723 724 725 726 727 728 729 730 731 |
if (rem) { curr_addr = (unsigned long) from; bytes = curr_addr - s_addr - rem; return bytes; } }) ) return bytes; } |
ec6347bb4 x86, powerpc: Ren... |
732 733 |
EXPORT_SYMBOL_GPL(_copy_mc_to_iter); #endif /* CONFIG_ARCH_HAS_COPY_MC */ |
8780356ef x86/asm/memcpy_mc... |
734 |
|
aa28de275 iov_iter/hardenin... |
735 |
size_t _copy_from_iter(void *addr, size_t bytes, struct iov_iter *i) |
c35e02480 Add copy_to_iter(... |
736 |
{ |
0dbca9a4b iov_iter.c: conve... |
737 |
char *to = addr; |
00e237074 iov_iter: Use acc... |
738 |
if (unlikely(iov_iter_is_pipe(i))) { |
241699cd7 new iov_iter flav... |
739 740 741 |
WARN_ON(1); return 0; } |
09fc68dc6 iov_iter: saner c... |
742 743 |
if (iter_is_iovec(i)) might_fault(); |
0dbca9a4b iov_iter.c: conve... |
744 |
iterate_and_advance(i, bytes, v, |
09fc68dc6 iov_iter: saner c... |
745 |
copyin((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len), |
0dbca9a4b iov_iter.c: conve... |
746 |
memcpy_from_page((to += v.bv_len) - v.bv_len, v.bv_page, |
a280455fa iov_iter.c: handl... |
747 748 |
v.bv_offset, v.bv_len), memcpy((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len) |
0dbca9a4b iov_iter.c: conve... |
749 750 751 |
) return bytes; |
c35e02480 Add copy_to_iter(... |
752 |
} |
aa28de275 iov_iter/hardenin... |
753 |
EXPORT_SYMBOL(_copy_from_iter); |
c35e02480 Add copy_to_iter(... |
754 |
|
aa28de275 iov_iter/hardenin... |
755 |
bool _copy_from_iter_full(void *addr, size_t bytes, struct iov_iter *i) |
cbbd26b8b [iov_iter] new pr... |
756 757 |
{ char *to = addr; |
00e237074 iov_iter: Use acc... |
758 |
if (unlikely(iov_iter_is_pipe(i))) { |
cbbd26b8b [iov_iter] new pr... |
759 760 761 |
WARN_ON(1); return false; } |
33844e665 [iov_iter] fix it... |
762 |
if (unlikely(i->count < bytes)) |
cbbd26b8b [iov_iter] new pr... |
763 |
return false; |
09fc68dc6 iov_iter: saner c... |
764 765 |
if (iter_is_iovec(i)) might_fault(); |
cbbd26b8b [iov_iter] new pr... |
766 |
iterate_all_kinds(i, bytes, v, ({ |
09fc68dc6 iov_iter: saner c... |
767 |
if (copyin((to += v.iov_len) - v.iov_len, |
cbbd26b8b [iov_iter] new pr... |
768 769 770 771 772 773 774 775 776 777 778 |
v.iov_base, v.iov_len)) return false; 0;}), memcpy_from_page((to += v.bv_len) - v.bv_len, v.bv_page, v.bv_offset, v.bv_len), memcpy((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len) ) iov_iter_advance(i, bytes); return true; } |
aa28de275 iov_iter/hardenin... |
779 |
EXPORT_SYMBOL(_copy_from_iter_full); |
cbbd26b8b [iov_iter] new pr... |
780 |
|
aa28de275 iov_iter/hardenin... |
781 |
size_t _copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i) |
aa583096d copy_from_iter_no... |
782 783 |
{ char *to = addr; |
00e237074 iov_iter: Use acc... |
784 |
if (unlikely(iov_iter_is_pipe(i))) { |
241699cd7 new iov_iter flav... |
785 786 787 |
WARN_ON(1); return 0; } |
aa583096d copy_from_iter_no... |
788 |
iterate_and_advance(i, bytes, v, |
3f763453e kill __copy_from_... |
789 |
__copy_from_user_inatomic_nocache((to += v.iov_len) - v.iov_len, |
aa583096d copy_from_iter_no... |
790 791 792 793 794 795 796 797 |
v.iov_base, v.iov_len), memcpy_from_page((to += v.bv_len) - v.bv_len, v.bv_page, v.bv_offset, v.bv_len), memcpy((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len) ) return bytes; } |
aa28de275 iov_iter/hardenin... |
798 |
EXPORT_SYMBOL(_copy_from_iter_nocache); |
aa583096d copy_from_iter_no... |
799 |
|
0aed55af8 x86, uaccess: int... |
800 |
#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE |
abd08d7d2 lib/iov_iter: Doc... |
801 802 803 804 805 806 807 808 809 810 811 812 813 814 |
/** * _copy_from_iter_flushcache - write destination through cpu cache * @addr: destination kernel address * @bytes: total transfer length * @iter: source iterator * * The pmem driver arranges for filesystem-dax to use this facility via * dax_copy_from_iter() for ensuring that writes to persistent memory * are flushed through the CPU cache. It is differentiated from * _copy_from_iter_nocache() in that guarantees all data is flushed for * all iterator types. The _copy_from_iter_nocache() only attempts to * bypass the cache for the ITER_IOVEC case, and on some archs may use * instructions that strand dirty-data in the cache. */ |
6a37e9400 Merge branch 'uac... |
815 |
size_t _copy_from_iter_flushcache(void *addr, size_t bytes, struct iov_iter *i) |
0aed55af8 x86, uaccess: int... |
816 817 |
{ char *to = addr; |
00e237074 iov_iter: Use acc... |
818 |
if (unlikely(iov_iter_is_pipe(i))) { |
0aed55af8 x86, uaccess: int... |
819 820 821 822 823 824 825 826 827 828 829 830 831 832 |
WARN_ON(1); return 0; } iterate_and_advance(i, bytes, v, __copy_from_user_flushcache((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len), memcpy_page_flushcache((to += v.bv_len) - v.bv_len, v.bv_page, v.bv_offset, v.bv_len), memcpy_flushcache((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len) ) return bytes; } |
6a37e9400 Merge branch 'uac... |
833 |
EXPORT_SYMBOL_GPL(_copy_from_iter_flushcache); |
0aed55af8 x86, uaccess: int... |
834 |
#endif |
aa28de275 iov_iter/hardenin... |
835 |
bool _copy_from_iter_full_nocache(void *addr, size_t bytes, struct iov_iter *i) |
cbbd26b8b [iov_iter] new pr... |
836 837 |
{ char *to = addr; |
00e237074 iov_iter: Use acc... |
838 |
if (unlikely(iov_iter_is_pipe(i))) { |
cbbd26b8b [iov_iter] new pr... |
839 840 841 |
WARN_ON(1); return false; } |
33844e665 [iov_iter] fix it... |
842 |
if (unlikely(i->count < bytes)) |
cbbd26b8b [iov_iter] new pr... |
843 844 |
return false; iterate_all_kinds(i, bytes, v, ({ |
3f763453e kill __copy_from_... |
845 |
if (__copy_from_user_inatomic_nocache((to += v.iov_len) - v.iov_len, |
cbbd26b8b [iov_iter] new pr... |
846 847 848 849 850 851 852 853 854 855 856 |
v.iov_base, v.iov_len)) return false; 0;}), memcpy_from_page((to += v.bv_len) - v.bv_len, v.bv_page, v.bv_offset, v.bv_len), memcpy((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len) ) iov_iter_advance(i, bytes); return true; } |
aa28de275 iov_iter/hardenin... |
857 |
EXPORT_SYMBOL(_copy_from_iter_full_nocache); |
cbbd26b8b [iov_iter] new pr... |
858 |
|
72e809ed8 iov_iter: sanity ... |
859 860 |
static inline bool page_copy_sane(struct page *page, size_t offset, size_t n) { |
6daef95b8 iov_iter: optimiz... |
861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 |
struct page *head; size_t v = n + offset; /* * The general case needs to access the page order in order * to compute the page size. * However, we mostly deal with order-0 pages and thus can * avoid a possible cache line miss for requests that fit all * page orders. */ if (n <= v && v <= PAGE_SIZE) return true; head = compound_head(page); v += (page - head) << PAGE_SHIFT; |
a90bcb86a iov_iter: fix pag... |
876 |
|
a50b854e0 mm: introduce pag... |
877 |
if (likely(n <= v && v <= (page_size(head)))) |
72e809ed8 iov_iter: sanity ... |
878 879 880 881 |
return true; WARN_ON(1); return false; } |
cbbd26b8b [iov_iter] new pr... |
882 |
|
62a8067a7 bio_vec-backed io... |
883 884 885 |
size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes, struct iov_iter *i) { |
72e809ed8 iov_iter: sanity ... |
886 887 |
if (unlikely(!page_copy_sane(page, offset, bytes))) return 0; |
d271524a3 iov_iter.c: get r... |
888 889 890 891 892 |
if (i->type & (ITER_BVEC|ITER_KVEC)) { void *kaddr = kmap_atomic(page); size_t wanted = copy_to_iter(kaddr + offset, bytes, i); kunmap_atomic(kaddr); return wanted; |
9ea9ce042 iov_iter: Add I/O... |
893 894 895 |
} else if (unlikely(iov_iter_is_discard(i))) return bytes; else if (likely(!iov_iter_is_pipe(i))) |
62a8067a7 bio_vec-backed io... |
896 |
return copy_page_to_iter_iovec(page, offset, bytes, i); |
241699cd7 new iov_iter flav... |
897 898 |
else return copy_page_to_iter_pipe(page, offset, bytes, i); |
62a8067a7 bio_vec-backed io... |
899 900 901 902 903 904 |
} EXPORT_SYMBOL(copy_page_to_iter); size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes, struct iov_iter *i) { |
72e809ed8 iov_iter: sanity ... |
905 906 |
if (unlikely(!page_copy_sane(page, offset, bytes))) return 0; |
9ea9ce042 iov_iter: Add I/O... |
907 |
if (unlikely(iov_iter_is_pipe(i) || iov_iter_is_discard(i))) { |
241699cd7 new iov_iter flav... |
908 909 910 |
WARN_ON(1); return 0; } |
a280455fa iov_iter.c: handl... |
911 |
if (i->type & (ITER_BVEC|ITER_KVEC)) { |
d271524a3 iov_iter.c: get r... |
912 |
void *kaddr = kmap_atomic(page); |
aa28de275 iov_iter/hardenin... |
913 |
size_t wanted = _copy_from_iter(kaddr + offset, bytes, i); |
d271524a3 iov_iter.c: get r... |
914 915 916 |
kunmap_atomic(kaddr); return wanted; } else |
62a8067a7 bio_vec-backed io... |
917 918 919 |
return copy_page_from_iter_iovec(page, offset, bytes, i); } EXPORT_SYMBOL(copy_page_from_iter); |
241699cd7 new iov_iter flav... |
920 921 922 |
static size_t pipe_zero(size_t bytes, struct iov_iter *i) { struct pipe_inode_info *pipe = i->pipe; |
8cefc107c pipe: Use head an... |
923 924 |
unsigned int p_mask = pipe->ring_size - 1; unsigned int i_head; |
241699cd7 new iov_iter flav... |
925 |
size_t n, off; |
241699cd7 new iov_iter flav... |
926 927 928 |
if (!sanity(i)) return 0; |
8cefc107c pipe: Use head an... |
929 |
bytes = n = push_pipe(i, bytes, &i_head, &off); |
241699cd7 new iov_iter flav... |
930 931 |
if (unlikely(!n)) return 0; |
8cefc107c pipe: Use head an... |
932 |
do { |
241699cd7 new iov_iter flav... |
933 |
size_t chunk = min_t(size_t, n, PAGE_SIZE - off); |
8cefc107c pipe: Use head an... |
934 935 |
memzero_page(pipe->bufs[i_head & p_mask].page, off, chunk); i->head = i_head; |
241699cd7 new iov_iter flav... |
936 937 |
i->iov_offset = off + chunk; n -= chunk; |
8cefc107c pipe: Use head an... |
938 939 940 |
off = 0; i_head++; } while (n); |
241699cd7 new iov_iter flav... |
941 942 943 |
i->count -= bytes; return bytes; } |
c35e02480 Add copy_to_iter(... |
944 945 |
size_t iov_iter_zero(size_t bytes, struct iov_iter *i) { |
00e237074 iov_iter: Use acc... |
946 |
if (unlikely(iov_iter_is_pipe(i))) |
241699cd7 new iov_iter flav... |
947 |
return pipe_zero(bytes, i); |
8442fa46c iov_iter.c: conve... |
948 |
iterate_and_advance(i, bytes, v, |
09fc68dc6 iov_iter: saner c... |
949 |
clear_user(v.iov_base, v.iov_len), |
a280455fa iov_iter.c: handl... |
950 951 |
memzero_page(v.bv_page, v.bv_offset, v.bv_len), memset(v.iov_base, 0, v.iov_len) |
8442fa46c iov_iter.c: conve... |
952 953 954 |
) return bytes; |
c35e02480 Add copy_to_iter(... |
955 956 |
} EXPORT_SYMBOL(iov_iter_zero); |
62a8067a7 bio_vec-backed io... |
957 958 959 |
size_t iov_iter_copy_from_user_atomic(struct page *page, struct iov_iter *i, unsigned long offset, size_t bytes) { |
04a311655 iov_iter.c: macro... |
960 |
char *kaddr = kmap_atomic(page), *p = kaddr + offset; |
72e809ed8 iov_iter: sanity ... |
961 962 963 964 |
if (unlikely(!page_copy_sane(page, offset, bytes))) { kunmap_atomic(kaddr); return 0; } |
9ea9ce042 iov_iter: Add I/O... |
965 |
if (unlikely(iov_iter_is_pipe(i) || iov_iter_is_discard(i))) { |
241699cd7 new iov_iter flav... |
966 967 968 969 |
kunmap_atomic(kaddr); WARN_ON(1); return 0; } |
04a311655 iov_iter.c: macro... |
970 |
iterate_all_kinds(i, bytes, v, |
09fc68dc6 iov_iter: saner c... |
971 |
copyin((p += v.iov_len) - v.iov_len, v.iov_base, v.iov_len), |
04a311655 iov_iter.c: macro... |
972 |
memcpy_from_page((p += v.bv_len) - v.bv_len, v.bv_page, |
a280455fa iov_iter.c: handl... |
973 974 |
v.bv_offset, v.bv_len), memcpy((p += v.iov_len) - v.iov_len, v.iov_base, v.iov_len) |
04a311655 iov_iter.c: macro... |
975 976 977 |
) kunmap_atomic(kaddr); return bytes; |
62a8067a7 bio_vec-backed io... |
978 979 |
} EXPORT_SYMBOL(iov_iter_copy_from_user_atomic); |
b9dc6f65b fix a fencepost e... |
980 981 982 |
static inline void pipe_truncate(struct iov_iter *i) { struct pipe_inode_info *pipe = i->pipe; |
8cefc107c pipe: Use head an... |
983 984 985 986 987 988 989 |
unsigned int p_tail = pipe->tail; unsigned int p_head = pipe->head; unsigned int p_mask = pipe->ring_size - 1; if (!pipe_empty(p_head, p_tail)) { struct pipe_buffer *buf; unsigned int i_head = i->head; |
b9dc6f65b fix a fencepost e... |
990 |
size_t off = i->iov_offset; |
8cefc107c pipe: Use head an... |
991 |
|
b9dc6f65b fix a fencepost e... |
992 |
if (off) { |
8cefc107c pipe: Use head an... |
993 994 995 |
buf = &pipe->bufs[i_head & p_mask]; buf->len = off - buf->offset; i_head++; |
b9dc6f65b fix a fencepost e... |
996 |
} |
8cefc107c pipe: Use head an... |
997 998 999 |
while (p_head != i_head) { p_head--; pipe_buf_release(pipe, &pipe->bufs[p_head & p_mask]); |
b9dc6f65b fix a fencepost e... |
1000 |
} |
8cefc107c pipe: Use head an... |
1001 1002 |
pipe->head = p_head; |
b9dc6f65b fix a fencepost e... |
1003 1004 |
} } |
241699cd7 new iov_iter flav... |
1005 1006 1007 |
static void pipe_advance(struct iov_iter *i, size_t size) { struct pipe_inode_info *pipe = i->pipe; |
241699cd7 new iov_iter flav... |
1008 1009 |
if (unlikely(i->count < size)) size = i->count; |
241699cd7 new iov_iter flav... |
1010 |
if (size) { |
b9dc6f65b fix a fencepost e... |
1011 |
struct pipe_buffer *buf; |
8cefc107c pipe: Use head an... |
1012 1013 |
unsigned int p_mask = pipe->ring_size - 1; unsigned int i_head = i->head; |
b9dc6f65b fix a fencepost e... |
1014 |
size_t off = i->iov_offset, left = size; |
8cefc107c pipe: Use head an... |
1015 |
|
241699cd7 new iov_iter flav... |
1016 |
if (off) /* make it relative to the beginning of buffer */ |
8cefc107c pipe: Use head an... |
1017 |
left += off - pipe->bufs[i_head & p_mask].offset; |
241699cd7 new iov_iter flav... |
1018 |
while (1) { |
8cefc107c pipe: Use head an... |
1019 |
buf = &pipe->bufs[i_head & p_mask]; |
b9dc6f65b fix a fencepost e... |
1020 |
if (left <= buf->len) |
241699cd7 new iov_iter flav... |
1021 |
break; |
b9dc6f65b fix a fencepost e... |
1022 |
left -= buf->len; |
8cefc107c pipe: Use head an... |
1023 |
i_head++; |
241699cd7 new iov_iter flav... |
1024 |
} |
8cefc107c pipe: Use head an... |
1025 |
i->head = i_head; |
b9dc6f65b fix a fencepost e... |
1026 |
i->iov_offset = buf->offset + left; |
241699cd7 new iov_iter flav... |
1027 |
} |
b9dc6f65b fix a fencepost e... |
1028 1029 1030 |
i->count -= size; /* ... and discard everything past that point */ pipe_truncate(i); |
241699cd7 new iov_iter flav... |
1031 |
} |
62a8067a7 bio_vec-backed io... |
1032 1033 |
void iov_iter_advance(struct iov_iter *i, size_t size) { |
00e237074 iov_iter: Use acc... |
1034 |
if (unlikely(iov_iter_is_pipe(i))) { |
241699cd7 new iov_iter flav... |
1035 1036 1037 |
pipe_advance(i, size); return; } |
9ea9ce042 iov_iter: Add I/O... |
1038 1039 1040 1041 |
if (unlikely(iov_iter_is_discard(i))) { i->count -= size; return; } |
a280455fa iov_iter.c: handl... |
1042 |
iterate_and_advance(i, size, v, 0, 0, 0) |
62a8067a7 bio_vec-backed io... |
1043 1044 |
} EXPORT_SYMBOL(iov_iter_advance); |
27c0e3748 [iov_iter] new pr... |
1045 1046 1047 1048 |
void iov_iter_revert(struct iov_iter *i, size_t unroll) { if (!unroll) return; |
5b47d59af fix braino in gen... |
1049 1050 |
if (WARN_ON(unroll > MAX_RW_COUNT)) return; |
27c0e3748 [iov_iter] new pr... |
1051 |
i->count += unroll; |
00e237074 iov_iter: Use acc... |
1052 |
if (unlikely(iov_iter_is_pipe(i))) { |
27c0e3748 [iov_iter] new pr... |
1053 |
struct pipe_inode_info *pipe = i->pipe; |
8cefc107c pipe: Use head an... |
1054 1055 |
unsigned int p_mask = pipe->ring_size - 1; unsigned int i_head = i->head; |
27c0e3748 [iov_iter] new pr... |
1056 1057 |
size_t off = i->iov_offset; while (1) { |
8cefc107c pipe: Use head an... |
1058 1059 |
struct pipe_buffer *b = &pipe->bufs[i_head & p_mask]; size_t n = off - b->offset; |
27c0e3748 [iov_iter] new pr... |
1060 |
if (unroll < n) { |
4fa55cefe fix a braino in I... |
1061 |
off -= unroll; |
27c0e3748 [iov_iter] new pr... |
1062 1063 1064 |
break; } unroll -= n; |
8cefc107c pipe: Use head an... |
1065 |
if (!unroll && i_head == i->start_head) { |
27c0e3748 [iov_iter] new pr... |
1066 1067 1068 |
off = 0; break; } |
8cefc107c pipe: Use head an... |
1069 1070 1071 |
i_head--; b = &pipe->bufs[i_head & p_mask]; off = b->offset + b->len; |
27c0e3748 [iov_iter] new pr... |
1072 1073 |
} i->iov_offset = off; |
8cefc107c pipe: Use head an... |
1074 |
i->head = i_head; |
27c0e3748 [iov_iter] new pr... |
1075 1076 1077 |
pipe_truncate(i); return; } |
9ea9ce042 iov_iter: Add I/O... |
1078 1079 |
if (unlikely(iov_iter_is_discard(i))) return; |
27c0e3748 [iov_iter] new pr... |
1080 1081 1082 1083 1084 |
if (unroll <= i->iov_offset) { i->iov_offset -= unroll; return; } unroll -= i->iov_offset; |
00e237074 iov_iter: Use acc... |
1085 |
if (iov_iter_is_bvec(i)) { |
27c0e3748 [iov_iter] new pr... |
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 |
const struct bio_vec *bvec = i->bvec; while (1) { size_t n = (--bvec)->bv_len; i->nr_segs++; if (unroll <= n) { i->bvec = bvec; i->iov_offset = n - unroll; return; } unroll -= n; } } else { /* same logics for iovec and kvec */ const struct iovec *iov = i->iov; while (1) { size_t n = (--iov)->iov_len; i->nr_segs++; if (unroll <= n) { i->iov = iov; i->iov_offset = n - unroll; return; } unroll -= n; } } } EXPORT_SYMBOL(iov_iter_revert); |
62a8067a7 bio_vec-backed io... |
1112 1113 1114 1115 1116 |
/* * Return the count of just the current iov_iter segment. */ size_t iov_iter_single_seg_count(const struct iov_iter *i) { |
00e237074 iov_iter: Use acc... |
1117 |
if (unlikely(iov_iter_is_pipe(i))) |
241699cd7 new iov_iter flav... |
1118 |
return i->count; // it is a silly place, anyway |
62a8067a7 bio_vec-backed io... |
1119 1120 |
if (i->nr_segs == 1) return i->count; |
9ea9ce042 iov_iter: Add I/O... |
1121 1122 |
if (unlikely(iov_iter_is_discard(i))) return i->count; |
00e237074 iov_iter: Use acc... |
1123 |
else if (iov_iter_is_bvec(i)) |
62a8067a7 bio_vec-backed io... |
1124 |
return min(i->count, i->bvec->bv_len - i->iov_offset); |
ad0eab929 Fix thinko in iov... |
1125 1126 |
else return min(i->count, i->iov->iov_len - i->iov_offset); |
62a8067a7 bio_vec-backed io... |
1127 1128 |
} EXPORT_SYMBOL(iov_iter_single_seg_count); |
aa563d7bc iov_iter: Separat... |
1129 |
void iov_iter_kvec(struct iov_iter *i, unsigned int direction, |
05afcb77e new helper: iov_i... |
1130 |
const struct kvec *kvec, unsigned long nr_segs, |
abb78f875 new helper: iov_i... |
1131 1132 |
size_t count) { |
aa563d7bc iov_iter: Separat... |
1133 1134 |
WARN_ON(direction & ~(READ | WRITE)); i->type = ITER_KVEC | (direction & (READ | WRITE)); |
05afcb77e new helper: iov_i... |
1135 |
i->kvec = kvec; |
abb78f875 new helper: iov_i... |
1136 1137 1138 1139 1140 |
i->nr_segs = nr_segs; i->iov_offset = 0; i->count = count; } EXPORT_SYMBOL(iov_iter_kvec); |
aa563d7bc iov_iter: Separat... |
1141 |
void iov_iter_bvec(struct iov_iter *i, unsigned int direction, |
05afcb77e new helper: iov_i... |
1142 1143 1144 |
const struct bio_vec *bvec, unsigned long nr_segs, size_t count) { |
aa563d7bc iov_iter: Separat... |
1145 1146 |
WARN_ON(direction & ~(READ | WRITE)); i->type = ITER_BVEC | (direction & (READ | WRITE)); |
05afcb77e new helper: iov_i... |
1147 1148 1149 1150 1151 1152 |
i->bvec = bvec; i->nr_segs = nr_segs; i->iov_offset = 0; i->count = count; } EXPORT_SYMBOL(iov_iter_bvec); |
aa563d7bc iov_iter: Separat... |
1153 |
void iov_iter_pipe(struct iov_iter *i, unsigned int direction, |
241699cd7 new iov_iter flav... |
1154 1155 1156 |
struct pipe_inode_info *pipe, size_t count) { |
aa563d7bc iov_iter: Separat... |
1157 |
BUG_ON(direction != READ); |
8cefc107c pipe: Use head an... |
1158 |
WARN_ON(pipe_full(pipe->head, pipe->tail, pipe->ring_size)); |
aa563d7bc iov_iter: Separat... |
1159 |
i->type = ITER_PIPE | READ; |
241699cd7 new iov_iter flav... |
1160 |
i->pipe = pipe; |
8cefc107c pipe: Use head an... |
1161 |
i->head = pipe->head; |
241699cd7 new iov_iter flav... |
1162 1163 |
i->iov_offset = 0; i->count = count; |
8cefc107c pipe: Use head an... |
1164 |
i->start_head = i->head; |
241699cd7 new iov_iter flav... |
1165 1166 |
} EXPORT_SYMBOL(iov_iter_pipe); |
9ea9ce042 iov_iter: Add I/O... |
1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 |
/** * iov_iter_discard - Initialise an I/O iterator that discards data * @i: The iterator to initialise. * @direction: The direction of the transfer. * @count: The size of the I/O buffer in bytes. * * Set up an I/O iterator that just discards everything that's written to it. * It's only available as a READ iterator. */ void iov_iter_discard(struct iov_iter *i, unsigned int direction, size_t count) { BUG_ON(direction != READ); i->type = ITER_DISCARD | READ; i->count = count; i->iov_offset = 0; } EXPORT_SYMBOL(iov_iter_discard); |
62a8067a7 bio_vec-backed io... |
1184 1185 |
unsigned long iov_iter_alignment(const struct iov_iter *i) { |
04a311655 iov_iter.c: macro... |
1186 1187 |
unsigned long res = 0; size_t size = i->count; |
00e237074 iov_iter: Use acc... |
1188 |
if (unlikely(iov_iter_is_pipe(i))) { |
e0ff126ee pipe: Fix bogus d... |
1189 |
unsigned int p_mask = i->pipe->ring_size - 1; |
8cefc107c pipe: Use head an... |
1190 |
if (size && i->iov_offset && allocated(&i->pipe->bufs[i->head & p_mask])) |
241699cd7 new iov_iter flav... |
1191 1192 1193 |
return size | i->iov_offset; return size; } |
04a311655 iov_iter.c: macro... |
1194 1195 |
iterate_all_kinds(i, size, v, (res |= (unsigned long)v.iov_base | v.iov_len, 0), |
a280455fa iov_iter.c: handl... |
1196 1197 |
res |= v.bv_offset | v.bv_len, res |= (unsigned long)v.iov_base | v.iov_len |
04a311655 iov_iter.c: macro... |
1198 1199 |
) return res; |
62a8067a7 bio_vec-backed io... |
1200 1201 |
} EXPORT_SYMBOL(iov_iter_alignment); |
357f435d8 fix the copy vs. ... |
1202 1203 |
unsigned long iov_iter_gap_alignment(const struct iov_iter *i) { |
33844e665 [iov_iter] fix it... |
1204 |
unsigned long res = 0; |
357f435d8 fix the copy vs. ... |
1205 |
size_t size = i->count; |
357f435d8 fix the copy vs. ... |
1206 |
|
9ea9ce042 iov_iter: Add I/O... |
1207 |
if (unlikely(iov_iter_is_pipe(i) || iov_iter_is_discard(i))) { |
241699cd7 new iov_iter flav... |
1208 1209 1210 |
WARN_ON(1); return ~0U; } |
357f435d8 fix the copy vs. ... |
1211 1212 1213 1214 1215 1216 1217 1218 |
iterate_all_kinds(i, size, v, (res |= (!res ? 0 : (unsigned long)v.iov_base) | (size != v.iov_len ? size : 0), 0), (res |= (!res ? 0 : (unsigned long)v.bv_offset) | (size != v.bv_len ? size : 0)), (res |= (!res ? 0 : (unsigned long)v.iov_base) | (size != v.iov_len ? size : 0)) ); |
33844e665 [iov_iter] fix it... |
1219 |
return res; |
357f435d8 fix the copy vs. ... |
1220 1221 |
} EXPORT_SYMBOL(iov_iter_gap_alignment); |
e76b63123 iov_iter: fix ret... |
1222 |
static inline ssize_t __pipe_get_pages(struct iov_iter *i, |
241699cd7 new iov_iter flav... |
1223 1224 |
size_t maxsize, struct page **pages, |
8cefc107c pipe: Use head an... |
1225 |
int iter_head, |
241699cd7 new iov_iter flav... |
1226 1227 1228 |
size_t *start) { struct pipe_inode_info *pipe = i->pipe; |
8cefc107c pipe: Use head an... |
1229 1230 |
unsigned int p_mask = pipe->ring_size - 1; ssize_t n = push_pipe(i, maxsize, &iter_head, start); |
241699cd7 new iov_iter flav... |
1231 1232 1233 1234 1235 |
if (!n) return -EFAULT; maxsize = n; n += *start; |
1689c73a7 Fix off-by-one in... |
1236 |
while (n > 0) { |
8cefc107c pipe: Use head an... |
1237 1238 |
get_page(*pages++ = pipe->bufs[iter_head & p_mask].page); iter_head++; |
241699cd7 new iov_iter flav... |
1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 |
n -= PAGE_SIZE; } return maxsize; } static ssize_t pipe_get_pages(struct iov_iter *i, struct page **pages, size_t maxsize, unsigned maxpages, size_t *start) { |
8cefc107c pipe: Use head an... |
1249 |
unsigned int iter_head, npages; |
241699cd7 new iov_iter flav... |
1250 |
size_t capacity; |
241699cd7 new iov_iter flav... |
1251 |
|
33844e665 [iov_iter] fix it... |
1252 1253 |
if (!maxsize) return 0; |
241699cd7 new iov_iter flav... |
1254 1255 |
if (!sanity(i)) return -EFAULT; |
8cefc107c pipe: Use head an... |
1256 1257 1258 1259 |
data_start(i, &iter_head, start); /* Amount of free space: some of this one + all after this one */ npages = pipe_space_for_user(iter_head, i->pipe->tail, i->pipe); capacity = min(npages, maxpages) * PAGE_SIZE - *start; |
241699cd7 new iov_iter flav... |
1260 |
|
8cefc107c pipe: Use head an... |
1261 |
return __pipe_get_pages(i, min(maxsize, capacity), pages, iter_head, start); |
241699cd7 new iov_iter flav... |
1262 |
} |
62a8067a7 bio_vec-backed io... |
1263 |
ssize_t iov_iter_get_pages(struct iov_iter *i, |
2c80929c4 fuse: honour max_... |
1264 |
struct page **pages, size_t maxsize, unsigned maxpages, |
62a8067a7 bio_vec-backed io... |
1265 1266 |
size_t *start) { |
e5393fae3 iov_iter.c: conve... |
1267 1268 |
if (maxsize > i->count) maxsize = i->count; |
00e237074 iov_iter: Use acc... |
1269 |
if (unlikely(iov_iter_is_pipe(i))) |
241699cd7 new iov_iter flav... |
1270 |
return pipe_get_pages(i, pages, maxsize, maxpages, start); |
9ea9ce042 iov_iter: Add I/O... |
1271 1272 |
if (unlikely(iov_iter_is_discard(i))) return -EFAULT; |
e5393fae3 iov_iter.c: conve... |
1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 |
iterate_all_kinds(i, maxsize, v, ({ unsigned long addr = (unsigned long)v.iov_base; size_t len = v.iov_len + (*start = addr & (PAGE_SIZE - 1)); int n; int res; if (len > maxpages * PAGE_SIZE) len = maxpages * PAGE_SIZE; addr &= ~(PAGE_SIZE - 1); n = DIV_ROUND_UP(len, PAGE_SIZE); |
73b0140bf mm/gup: change GU... |
1283 1284 1285 |
res = get_user_pages_fast(addr, n, iov_iter_rw(i) != WRITE ? FOLL_WRITE : 0, pages); |
e5393fae3 iov_iter.c: conve... |
1286 1287 1288 1289 1290 1291 1292 1293 |
if (unlikely(res < 0)) return res; return (res == n ? len : res * PAGE_SIZE) - *start; 0;}),({ /* can't be more than PAGE_SIZE */ *start = v.bv_offset; get_page(*pages = v.bv_page); return v.bv_len; |
a280455fa iov_iter.c: handl... |
1294 1295 |
}),({ return -EFAULT; |
e5393fae3 iov_iter.c: conve... |
1296 1297 1298 |
}) ) return 0; |
62a8067a7 bio_vec-backed io... |
1299 1300 |
} EXPORT_SYMBOL(iov_iter_get_pages); |
1b17f1f2e iov_iter.c: conve... |
1301 1302 |
static struct page **get_pages_array(size_t n) { |
752ade68c treewide: use kv[... |
1303 |
return kvmalloc_array(n, sizeof(struct page *), GFP_KERNEL); |
1b17f1f2e iov_iter.c: conve... |
1304 |
} |
241699cd7 new iov_iter flav... |
1305 1306 1307 1308 1309 |
static ssize_t pipe_get_pages_alloc(struct iov_iter *i, struct page ***pages, size_t maxsize, size_t *start) { struct page **p; |
8cefc107c pipe: Use head an... |
1310 |
unsigned int iter_head, npages; |
d7760d638 iov_iter: fix mem... |
1311 |
ssize_t n; |
241699cd7 new iov_iter flav... |
1312 |
|
33844e665 [iov_iter] fix it... |
1313 1314 |
if (!maxsize) return 0; |
241699cd7 new iov_iter flav... |
1315 1316 |
if (!sanity(i)) return -EFAULT; |
8cefc107c pipe: Use head an... |
1317 1318 1319 |
data_start(i, &iter_head, start); /* Amount of free space: some of this one + all after this one */ npages = pipe_space_for_user(iter_head, i->pipe->tail, i->pipe); |
241699cd7 new iov_iter flav... |
1320 1321 1322 1323 1324 1325 1326 1327 |
n = npages * PAGE_SIZE - *start; if (maxsize > n) maxsize = n; else npages = DIV_ROUND_UP(maxsize + *start, PAGE_SIZE); p = get_pages_array(npages); if (!p) return -ENOMEM; |
8cefc107c pipe: Use head an... |
1328 |
n = __pipe_get_pages(i, maxsize, p, iter_head, start); |
241699cd7 new iov_iter flav... |
1329 1330 1331 1332 1333 1334 |
if (n > 0) *pages = p; else kvfree(p); return n; } |
62a8067a7 bio_vec-backed io... |
1335 1336 1337 1338 |
ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, struct page ***pages, size_t maxsize, size_t *start) { |
1b17f1f2e iov_iter.c: conve... |
1339 1340 1341 1342 |
struct page **p; if (maxsize > i->count) maxsize = i->count; |
00e237074 iov_iter: Use acc... |
1343 |
if (unlikely(iov_iter_is_pipe(i))) |
241699cd7 new iov_iter flav... |
1344 |
return pipe_get_pages_alloc(i, pages, maxsize, start); |
9ea9ce042 iov_iter: Add I/O... |
1345 1346 |
if (unlikely(iov_iter_is_discard(i))) return -EFAULT; |
1b17f1f2e iov_iter.c: conve... |
1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 |
iterate_all_kinds(i, maxsize, v, ({ unsigned long addr = (unsigned long)v.iov_base; size_t len = v.iov_len + (*start = addr & (PAGE_SIZE - 1)); int n; int res; addr &= ~(PAGE_SIZE - 1); n = DIV_ROUND_UP(len, PAGE_SIZE); p = get_pages_array(n); if (!p) return -ENOMEM; |
73b0140bf mm/gup: change GU... |
1358 1359 |
res = get_user_pages_fast(addr, n, iov_iter_rw(i) != WRITE ? FOLL_WRITE : 0, p); |
1b17f1f2e iov_iter.c: conve... |
1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 |
if (unlikely(res < 0)) { kvfree(p); return res; } *pages = p; return (res == n ? len : res * PAGE_SIZE) - *start; 0;}),({ /* can't be more than PAGE_SIZE */ *start = v.bv_offset; *pages = p = get_pages_array(1); if (!p) return -ENOMEM; get_page(*p = v.bv_page); return v.bv_len; |
a280455fa iov_iter.c: handl... |
1374 1375 |
}),({ return -EFAULT; |
1b17f1f2e iov_iter.c: conve... |
1376 1377 1378 |
}) ) return 0; |
62a8067a7 bio_vec-backed io... |
1379 1380 |
} EXPORT_SYMBOL(iov_iter_get_pages_alloc); |
a604ec7e9 csum_and_copy_...... |
1381 1382 1383 1384 1385 1386 |
size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i) { char *to = addr; __wsum sum, next; size_t off = 0; |
a604ec7e9 csum_and_copy_...... |
1387 |
sum = *csum; |
9ea9ce042 iov_iter: Add I/O... |
1388 |
if (unlikely(iov_iter_is_pipe(i) || iov_iter_is_discard(i))) { |
241699cd7 new iov_iter flav... |
1389 1390 1391 |
WARN_ON(1); return 0; } |
a604ec7e9 csum_and_copy_...... |
1392 |
iterate_and_advance(i, bytes, v, ({ |
cbbd26b8b [iov_iter] new pr... |
1393 |
next = csum_and_copy_from_user(v.iov_base, |
a604ec7e9 csum_and_copy_...... |
1394 |
(to += v.iov_len) - v.iov_len, |
c693cc467 saner calling con... |
1395 1396 |
v.iov_len); if (next) { |
a604ec7e9 csum_and_copy_...... |
1397 1398 1399 |
sum = csum_block_add(sum, next, off); off += v.iov_len; } |
c693cc467 saner calling con... |
1400 |
next ? 0 : v.iov_len; |
a604ec7e9 csum_and_copy_...... |
1401 1402 |
}), ({ char *p = kmap_atomic(v.bv_page); |
f91528955 iov_iter: reduce ... |
1403 1404 1405 |
sum = csum_and_memcpy((to += v.bv_len) - v.bv_len, p + v.bv_offset, v.bv_len, sum, off); |
a604ec7e9 csum_and_copy_...... |
1406 |
kunmap_atomic(p); |
a604ec7e9 csum_and_copy_...... |
1407 1408 |
off += v.bv_len; }),({ |
f91528955 iov_iter: reduce ... |
1409 1410 1411 |
sum = csum_and_memcpy((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len, sum, off); |
a604ec7e9 csum_and_copy_...... |
1412 1413 1414 1415 1416 1417 1418 |
off += v.iov_len; }) ) *csum = sum; return bytes; } EXPORT_SYMBOL(csum_and_copy_from_iter); |
cbbd26b8b [iov_iter] new pr... |
1419 1420 1421 1422 1423 1424 1425 |
bool csum_and_copy_from_iter_full(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i) { char *to = addr; __wsum sum, next; size_t off = 0; sum = *csum; |
9ea9ce042 iov_iter: Add I/O... |
1426 |
if (unlikely(iov_iter_is_pipe(i) || iov_iter_is_discard(i))) { |
cbbd26b8b [iov_iter] new pr... |
1427 1428 1429 1430 1431 1432 |
WARN_ON(1); return false; } if (unlikely(i->count < bytes)) return false; iterate_all_kinds(i, bytes, v, ({ |
cbbd26b8b [iov_iter] new pr... |
1433 1434 |
next = csum_and_copy_from_user(v.iov_base, (to += v.iov_len) - v.iov_len, |
c693cc467 saner calling con... |
1435 1436 |
v.iov_len); if (!next) |
cbbd26b8b [iov_iter] new pr... |
1437 1438 1439 1440 1441 1442 |
return false; sum = csum_block_add(sum, next, off); off += v.iov_len; 0; }), ({ char *p = kmap_atomic(v.bv_page); |
f91528955 iov_iter: reduce ... |
1443 1444 1445 |
sum = csum_and_memcpy((to += v.bv_len) - v.bv_len, p + v.bv_offset, v.bv_len, sum, off); |
cbbd26b8b [iov_iter] new pr... |
1446 |
kunmap_atomic(p); |
cbbd26b8b [iov_iter] new pr... |
1447 1448 |
off += v.bv_len; }),({ |
f91528955 iov_iter: reduce ... |
1449 1450 1451 |
sum = csum_and_memcpy((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len, sum, off); |
cbbd26b8b [iov_iter] new pr... |
1452 1453 1454 1455 1456 1457 1458 1459 |
off += v.iov_len; }) ) *csum = sum; iov_iter_advance(i, bytes); return true; } EXPORT_SYMBOL(csum_and_copy_from_iter_full); |
cb002d074 iov_iter: pass vo... |
1460 |
size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump, |
a604ec7e9 csum_and_copy_...... |
1461 1462 |
struct iov_iter *i) { |
36f7a8a4c iov_iter: constif... |
1463 |
const char *from = addr; |
cb002d074 iov_iter: pass vo... |
1464 |
__wsum *csum = csump; |
a604ec7e9 csum_and_copy_...... |
1465 1466 |
__wsum sum, next; size_t off = 0; |
78e1f3861 iov_iter: teach c... |
1467 1468 1469 |
if (unlikely(iov_iter_is_pipe(i))) return csum_and_copy_to_pipe_iter(addr, bytes, csum, i); |
a604ec7e9 csum_and_copy_...... |
1470 |
sum = *csum; |
78e1f3861 iov_iter: teach c... |
1471 |
if (unlikely(iov_iter_is_discard(i))) { |
241699cd7 new iov_iter flav... |
1472 1473 1474 |
WARN_ON(1); /* for now */ return 0; } |
a604ec7e9 csum_and_copy_...... |
1475 |
iterate_and_advance(i, bytes, v, ({ |
a604ec7e9 csum_and_copy_...... |
1476 |
next = csum_and_copy_to_user((from += v.iov_len) - v.iov_len, |
cbbd26b8b [iov_iter] new pr... |
1477 |
v.iov_base, |
c693cc467 saner calling con... |
1478 1479 |
v.iov_len); if (next) { |
a604ec7e9 csum_and_copy_...... |
1480 1481 1482 |
sum = csum_block_add(sum, next, off); off += v.iov_len; } |
c693cc467 saner calling con... |
1483 |
next ? 0 : v.iov_len; |
a604ec7e9 csum_and_copy_...... |
1484 1485 |
}), ({ char *p = kmap_atomic(v.bv_page); |
f91528955 iov_iter: reduce ... |
1486 1487 1488 |
sum = csum_and_memcpy(p + v.bv_offset, (from += v.bv_len) - v.bv_len, v.bv_len, sum, off); |
a604ec7e9 csum_and_copy_...... |
1489 |
kunmap_atomic(p); |
a604ec7e9 csum_and_copy_...... |
1490 1491 |
off += v.bv_len; }),({ |
f91528955 iov_iter: reduce ... |
1492 1493 1494 |
sum = csum_and_memcpy(v.iov_base, (from += v.iov_len) - v.iov_len, v.iov_len, sum, off); |
a604ec7e9 csum_and_copy_...... |
1495 1496 1497 1498 1499 1500 1501 |
off += v.iov_len; }) ) *csum = sum; return bytes; } EXPORT_SYMBOL(csum_and_copy_to_iter); |
d05f44355 iov_iter: introdu... |
1502 1503 1504 |
size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp, struct iov_iter *i) { |
7999096fa iov_iter: Move un... |
1505 |
#ifdef CONFIG_CRYPTO_HASH |
d05f44355 iov_iter: introdu... |
1506 1507 1508 1509 1510 1511 1512 1513 1514 |
struct ahash_request *hash = hashp; struct scatterlist sg; size_t copied; copied = copy_to_iter(addr, bytes, i); sg_init_one(&sg, addr, copied); ahash_request_set_crypt(hash, &sg, NULL, copied); crypto_ahash_update(hash); return copied; |
27fad74a5 iov_iter: Fix bui... |
1515 1516 1517 |
#else return 0; #endif |
d05f44355 iov_iter: introdu... |
1518 1519 |
} EXPORT_SYMBOL(hash_and_copy_to_iter); |
62a8067a7 bio_vec-backed io... |
1520 1521 |
int iov_iter_npages(const struct iov_iter *i, int maxpages) { |
e0f2dc406 iov_iter.c: conve... |
1522 1523 1524 1525 1526 |
size_t size = i->count; int npages = 0; if (!size) return 0; |
9ea9ce042 iov_iter: Add I/O... |
1527 1528 |
if (unlikely(iov_iter_is_discard(i))) return 0; |
e0f2dc406 iov_iter.c: conve... |
1529 |
|
00e237074 iov_iter: Use acc... |
1530 |
if (unlikely(iov_iter_is_pipe(i))) { |
241699cd7 new iov_iter flav... |
1531 |
struct pipe_inode_info *pipe = i->pipe; |
8cefc107c pipe: Use head an... |
1532 |
unsigned int iter_head; |
241699cd7 new iov_iter flav... |
1533 |
size_t off; |
241699cd7 new iov_iter flav... |
1534 1535 1536 |
if (!sanity(i)) return 0; |
8cefc107c pipe: Use head an... |
1537 |
data_start(i, &iter_head, &off); |
241699cd7 new iov_iter flav... |
1538 |
/* some of this one + all after this one */ |
8cefc107c pipe: Use head an... |
1539 |
npages = pipe_space_for_user(iter_head, pipe->tail, pipe); |
241699cd7 new iov_iter flav... |
1540 1541 1542 |
if (npages >= maxpages) return maxpages; } else iterate_all_kinds(i, size, v, ({ |
e0f2dc406 iov_iter.c: conve... |
1543 1544 1545 1546 1547 1548 1549 1550 1551 |
unsigned long p = (unsigned long)v.iov_base; npages += DIV_ROUND_UP(p + v.iov_len, PAGE_SIZE) - p / PAGE_SIZE; if (npages >= maxpages) return maxpages; 0;}),({ npages++; if (npages >= maxpages) return maxpages; |
a280455fa iov_iter.c: handl... |
1552 1553 1554 1555 1556 1557 |
}),({ unsigned long p = (unsigned long)v.iov_base; npages += DIV_ROUND_UP(p + v.iov_len, PAGE_SIZE) - p / PAGE_SIZE; if (npages >= maxpages) return maxpages; |
e0f2dc406 iov_iter.c: conve... |
1558 1559 1560 |
}) ) return npages; |
62a8067a7 bio_vec-backed io... |
1561 |
} |
f67da30c1 new helper: iov_i... |
1562 |
EXPORT_SYMBOL(iov_iter_npages); |
4b8164b91 new helper: dup_i... |
1563 1564 1565 1566 |
const void *dup_iter(struct iov_iter *new, struct iov_iter *old, gfp_t flags) { *new = *old; |
00e237074 iov_iter: Use acc... |
1567 |
if (unlikely(iov_iter_is_pipe(new))) { |
241699cd7 new iov_iter flav... |
1568 1569 1570 |
WARN_ON(1); return NULL; } |
9ea9ce042 iov_iter: Add I/O... |
1571 1572 |
if (unlikely(iov_iter_is_discard(new))) return NULL; |
00e237074 iov_iter: Use acc... |
1573 |
if (iov_iter_is_bvec(new)) |
4b8164b91 new helper: dup_i... |
1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 |
return new->bvec = kmemdup(new->bvec, new->nr_segs * sizeof(struct bio_vec), flags); else /* iovec and kvec have identical layout */ return new->iov = kmemdup(new->iov, new->nr_segs * sizeof(struct iovec), flags); } EXPORT_SYMBOL(dup_iter); |
bc917be81 saner iov_iter in... |
1584 |
|
d219a4240 Revert "Revert "i... |
1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 |
static int copy_compat_iovec_from_user(struct iovec *iov, const struct iovec __user *uvec, unsigned long nr_segs) { const struct compat_iovec __user *uiov = (const struct compat_iovec __user *)uvec; int ret = -EFAULT, i; if (!user_access_begin(uvec, nr_segs * sizeof(*uvec))) return -EFAULT; for (i = 0; i < nr_segs; i++) { compat_uptr_t buf; compat_ssize_t len; unsafe_get_user(len, &uiov[i].iov_len, uaccess_end); unsafe_get_user(buf, &uiov[i].iov_base, uaccess_end); /* check for compat_size_t not fitting in compat_ssize_t .. */ if (len < 0) { ret = -EINVAL; goto uaccess_end; } iov[i].iov_base = compat_ptr(buf); iov[i].iov_len = len; } ret = 0; uaccess_end: user_access_end(); return ret; } static int copy_iovec_from_user(struct iovec *iov, const struct iovec __user *uvec, unsigned long nr_segs) |
e1a742255 Revert "Revert "i... |
1619 1620 |
{ unsigned long seg; |
e1a742255 Revert "Revert "i... |
1621 |
|
d219a4240 Revert "Revert "i... |
1622 1623 1624 1625 1626 |
if (copy_from_user(iov, uvec, nr_segs * sizeof(*uvec))) return -EFAULT; for (seg = 0; seg < nr_segs; seg++) { if ((ssize_t)iov[seg].iov_len < 0) return -EINVAL; |
e1a742255 Revert "Revert "i... |
1627 |
} |
d219a4240 Revert "Revert "i... |
1628 1629 1630 1631 1632 1633 1634 1635 1636 |
return 0; } struct iovec *iovec_from_user(const struct iovec __user *uvec, unsigned long nr_segs, unsigned long fast_segs, struct iovec *fast_iov, bool compat) { struct iovec *iov = fast_iov; int ret; |
e1a742255 Revert "Revert "i... |
1637 |
/* |
d219a4240 Revert "Revert "i... |
1638 1639 1640 |
* SuS says "The readv() function *may* fail if the iovcnt argument was * less than or equal to 0, or greater than {IOV_MAX}. Linux has * traditionally returned zero for zero segments, so... |
e1a742255 Revert "Revert "i... |
1641 |
*/ |
d219a4240 Revert "Revert "i... |
1642 1643 1644 1645 |
if (nr_segs == 0) return iov; if (nr_segs > UIO_MAXIOV) return ERR_PTR(-EINVAL); |
e1a742255 Revert "Revert "i... |
1646 1647 |
if (nr_segs > fast_segs) { iov = kmalloc_array(nr_segs, sizeof(struct iovec), GFP_KERNEL); |
d219a4240 Revert "Revert "i... |
1648 1649 |
if (!iov) return ERR_PTR(-ENOMEM); |
e1a742255 Revert "Revert "i... |
1650 |
} |
d219a4240 Revert "Revert "i... |
1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 |
if (compat) ret = copy_compat_iovec_from_user(iov, uvec, nr_segs); else ret = copy_iovec_from_user(iov, uvec, nr_segs); if (ret) { if (iov != fast_iov) kfree(iov); return ERR_PTR(ret); } return iov; } ssize_t __import_iovec(int type, const struct iovec __user *uvec, unsigned nr_segs, unsigned fast_segs, struct iovec **iovp, struct iov_iter *i, bool compat) { ssize_t total_len = 0; unsigned long seg; struct iovec *iov; iov = iovec_from_user(uvec, nr_segs, fast_segs, *iovp, compat); if (IS_ERR(iov)) { *iovp = NULL; return PTR_ERR(iov); |
e1a742255 Revert "Revert "i... |
1677 1678 1679 |
} /* |
d219a4240 Revert "Revert "i... |
1680 1681 1682 |
* According to the Single Unix Specification we should return EINVAL if * an element length is < 0 when cast to ssize_t or if the total length * would overflow the ssize_t return value of the system call. |
e1a742255 Revert "Revert "i... |
1683 1684 1685 1686 |
* * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the * overflow case. */ |
e1a742255 Revert "Revert "i... |
1687 |
for (seg = 0; seg < nr_segs; seg++) { |
e1a742255 Revert "Revert "i... |
1688 |
ssize_t len = (ssize_t)iov[seg].iov_len; |
d219a4240 Revert "Revert "i... |
1689 1690 1691 1692 1693 |
if (!access_ok(iov[seg].iov_base, len)) { if (iov != *iovp) kfree(iov); *iovp = NULL; return -EFAULT; |
e1a742255 Revert "Revert "i... |
1694 |
} |
d219a4240 Revert "Revert "i... |
1695 1696 1697 |
if (len > MAX_RW_COUNT - total_len) { len = MAX_RW_COUNT - total_len; |
e1a742255 Revert "Revert "i... |
1698 1699 |
iov[seg].iov_len = len; } |
d219a4240 Revert "Revert "i... |
1700 |
total_len += len; |
e1a742255 Revert "Revert "i... |
1701 |
} |
d219a4240 Revert "Revert "i... |
1702 1703 1704 1705 1706 1707 1708 |
iov_iter_init(i, type, iov, nr_segs, total_len); if (iov == *iovp) *iovp = NULL; else *iovp = iov; return total_len; |
e1a742255 Revert "Revert "i... |
1709 1710 1711 |
} /** |
ffecee4f2 iov_iter: kernel-... |
1712 1713 1714 1715 1716 |
* import_iovec() - Copy an array of &struct iovec from userspace * into the kernel, check that it is valid, and initialize a new * &struct iov_iter iterator to access it. * * @type: One of %READ or %WRITE. |
d219a4240 Revert "Revert "i... |
1717 |
* @uvec: Pointer to the userspace array. |
ffecee4f2 iov_iter: kernel-... |
1718 1719 |
* @nr_segs: Number of elements in userspace array. * @fast_segs: Number of elements in @iov. |
d219a4240 Revert "Revert "i... |
1720 |
* @iovp: (input and output parameter) Pointer to pointer to (usually small |
ffecee4f2 iov_iter: kernel-... |
1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 |
* on-stack) kernel array. * @i: Pointer to iterator that will be initialized on success. * * If the array pointed to by *@iov is large enough to hold all @nr_segs, * then this function places %NULL in *@iov on return. Otherwise, a new * array will be allocated and the result placed in *@iov. This means that * the caller may call kfree() on *@iov regardless of whether the small * on-stack array was used or not (and regardless of whether this function * returns an error or not). * |
87e5e6dab uio: make import_... |
1731 |
* Return: Negative error code on error, bytes imported on success |
ffecee4f2 iov_iter: kernel-... |
1732 |
*/ |
d219a4240 Revert "Revert "i... |
1733 |
ssize_t import_iovec(int type, const struct iovec __user *uvec, |
bc917be81 saner iov_iter in... |
1734 |
unsigned nr_segs, unsigned fast_segs, |
d219a4240 Revert "Revert "i... |
1735 |
struct iovec **iovp, struct iov_iter *i) |
bc917be81 saner iov_iter in... |
1736 |
{ |
b28ad9eb4 Revert "Revert "i... |
1737 1738 |
return __import_iovec(type, uvec, nr_segs, fast_segs, iovp, i, in_compat_syscall()); |
bc917be81 saner iov_iter in... |
1739 1740 |
} EXPORT_SYMBOL(import_iovec); |
bc917be81 saner iov_iter in... |
1741 1742 1743 1744 1745 |
int import_single_range(int rw, void __user *buf, size_t len, struct iovec *iov, struct iov_iter *i) { if (len > MAX_RW_COUNT) len = MAX_RW_COUNT; |
96d4f267e Remove 'type' arg... |
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if (unlikely(!access_ok(buf, len))) |
bc917be81 saner iov_iter in... |
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return -EFAULT; iov->iov_base = buf; iov->iov_len = len; iov_iter_init(i, rw, iov, 1, len); return 0; } |
e12675853 iov_iter: export ... |
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EXPORT_SYMBOL(import_single_range); |
09cf698a5 new primitive: io... |
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int iov_iter_for_each_range(struct iov_iter *i, size_t bytes, int (*f)(struct kvec *vec, void *context), void *context) { struct kvec w; int err = -EINVAL; if (!bytes) return 0; iterate_all_kinds(i, bytes, v, -EINVAL, ({ w.iov_base = kmap(v.bv_page) + v.bv_offset; w.iov_len = v.bv_len; err = f(&w, context); kunmap(v.bv_page); err;}), ({ w = v; err = f(&w, context);}) ) return err; } EXPORT_SYMBOL(iov_iter_for_each_range); |