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Diffstat (limited to 'block/bio.c')
-rw-r--r--block/bio.c113
1 files changed, 57 insertions, 56 deletions
diff --git a/block/bio.c b/block/bio.c
index 349f275430cd..12b67f619194 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -975,18 +975,17 @@ void bio_copy_data(struct bio *dst, struct bio *src)
EXPORT_SYMBOL(bio_copy_data);
struct bio_map_data {
- int nr_sgvecs;
int is_our_pages;
- struct sg_iovec sgvecs[];
+ struct iov_iter iter;
+ struct iovec sgvecs[];
};
static void bio_set_map_data(struct bio_map_data *bmd, struct bio *bio,
- const struct sg_iovec *iov, int iov_count,
- int is_our_pages)
+ const struct iov_iter *iter, int is_our_pages)
{
- memcpy(bmd->sgvecs, iov, sizeof(struct sg_iovec) * iov_count);
- bmd->nr_sgvecs = iov_count;
bmd->is_our_pages = is_our_pages;
+ bmd->iter = *iter;
+ memcpy(bmd->sgvecs, iter->iov, sizeof(struct iovec) * iter->nr_segs);
bio->bi_private = bmd;
}
@@ -1000,33 +999,30 @@ static struct bio_map_data *bio_alloc_map_data(unsigned int iov_count,
sizeof(struct sg_iovec) * iov_count, gfp_mask);
}
-static int __bio_copy_iov(struct bio *bio, const struct sg_iovec *iov, int iov_count,
+static int __bio_copy_iov(struct bio *bio, const struct iov_iter *iter,
int to_user, int from_user, int do_free_page)
{
int ret = 0, i;
struct bio_vec *bvec;
- int iov_idx = 0;
- unsigned int iov_off = 0;
+ struct iov_iter iov_iter = *iter;
bio_for_each_segment_all(bvec, bio, i) {
char *bv_addr = page_address(bvec->bv_page);
unsigned int bv_len = bvec->bv_len;
- while (bv_len && iov_idx < iov_count) {
- unsigned int bytes;
- char __user *iov_addr;
-
- bytes = min_t(unsigned int,
- iov[iov_idx].iov_len - iov_off, bv_len);
- iov_addr = iov[iov_idx].iov_base + iov_off;
+ while (bv_len && iov_iter.count) {
+ struct iovec iov = iov_iter_iovec(&iov_iter);
+ unsigned int bytes = min_t(unsigned int, bv_len,
+ iov.iov_len);
if (!ret) {
if (to_user)
- ret = copy_to_user(iov_addr, bv_addr,
- bytes);
+ ret = copy_to_user(iov.iov_base,
+ bv_addr, bytes);
if (from_user)
- ret = copy_from_user(bv_addr, iov_addr,
+ ret = copy_from_user(bv_addr,
+ iov.iov_base,
bytes);
if (ret)
@@ -1035,13 +1031,7 @@ static int __bio_copy_iov(struct bio *bio, const struct sg_iovec *iov, int iov_c
bv_len -= bytes;
bv_addr += bytes;
- iov_addr += bytes;
- iov_off += bytes;
-
- if (iov[iov_idx].iov_len == iov_off) {
- iov_idx++;
- iov_off = 0;
- }
+ iov_iter_advance(&iov_iter, bytes);
}
if (do_free_page)
@@ -1070,7 +1060,7 @@ int bio_uncopy_user(struct bio *bio)
* don't copy into a random user address space, just free.
*/
if (current->mm)
- ret = __bio_copy_iov(bio, bmd->sgvecs, bmd->nr_sgvecs,
+ ret = __bio_copy_iov(bio, &bmd->iter,
bio_data_dir(bio) == READ,
0, bmd->is_our_pages);
else if (bmd->is_our_pages)
@@ -1098,7 +1088,7 @@ EXPORT_SYMBOL(bio_uncopy_user);
*/
struct bio *bio_copy_user_iov(struct request_queue *q,
struct rq_map_data *map_data,
- const struct sg_iovec *iov, int iov_count,
+ const struct iov_iter *iter,
int write_to_vm, gfp_t gfp_mask)
{
struct bio_map_data *bmd;
@@ -1107,16 +1097,16 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
struct bio *bio;
int i, ret;
int nr_pages = 0;
- unsigned int len = 0;
+ unsigned int len;
unsigned int offset = map_data ? map_data->offset & ~PAGE_MASK : 0;
- for (i = 0; i < iov_count; i++) {
+ for (i = 0; i < iter->nr_segs; i++) {
unsigned long uaddr;
unsigned long end;
unsigned long start;
- uaddr = (unsigned long)iov[i].iov_base;
- end = (uaddr + iov[i].iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ uaddr = (unsigned long) iter->iov[i].iov_base;
+ end = (uaddr + iter->iov[i].iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT;
start = uaddr >> PAGE_SHIFT;
/*
@@ -1126,13 +1116,12 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
return ERR_PTR(-EINVAL);
nr_pages += end - start;
- len += iov[i].iov_len;
}
if (offset)
nr_pages++;
- bmd = bio_alloc_map_data(iov_count, gfp_mask);
+ bmd = bio_alloc_map_data(iter->nr_segs, gfp_mask);
if (!bmd)
return ERR_PTR(-ENOMEM);
@@ -1149,7 +1138,12 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
if (map_data) {
nr_pages = 1 << map_data->page_order;
i = map_data->offset / PAGE_SIZE;
+ } else {
+ i = 0;
}
+
+ len = iter->count;
+
while (len) {
unsigned int bytes = PAGE_SIZE;
@@ -1191,12 +1185,12 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
*/
if ((!write_to_vm && (!map_data || !map_data->null_mapped)) ||
(map_data && map_data->from_user)) {
- ret = __bio_copy_iov(bio, iov, iov_count, 0, 1, 0);
+ ret = __bio_copy_iov(bio, iter, 0, 1, 0);
if (ret)
goto cleanup;
}
- bio_set_map_data(bmd, bio, iov, iov_count, map_data ? 0 : 1);
+ bio_set_map_data(bmd, bio, iter, map_data ? 0 : 1);
return bio;
cleanup:
if (!map_data)
@@ -1226,30 +1220,35 @@ struct bio *bio_copy_user(struct request_queue *q, struct rq_map_data *map_data,
unsigned long uaddr, unsigned int len,
int write_to_vm, gfp_t gfp_mask)
{
- struct sg_iovec iov;
+ struct iovec iov;
+ struct iov_iter i;
- iov.iov_base = (void __user *)uaddr;
+ iov.iov_base = (void __user *) uaddr;
iov.iov_len = len;
- return bio_copy_user_iov(q, map_data, &iov, 1, write_to_vm, gfp_mask);
+ iov_iter_init(&i, write_to_vm ? WRITE : READ, &iov, 1, len);
+
+ return bio_copy_user_iov(q, map_data, &i, write_to_vm, gfp_mask);
}
EXPORT_SYMBOL(bio_copy_user);
static struct bio *__bio_map_user_iov(struct request_queue *q,
struct block_device *bdev,
- const struct sg_iovec *iov, int iov_count,
+ const struct iov_iter *iter,
int write_to_vm, gfp_t gfp_mask)
{
- int i, j;
+ int j;
int nr_pages = 0;
struct page **pages;
struct bio *bio;
int cur_page = 0;
int ret, offset;
+ struct iov_iter i;
+ struct iovec iov;
- for (i = 0; i < iov_count; i++) {
- unsigned long uaddr = (unsigned long)iov[i].iov_base;
- unsigned long len = iov[i].iov_len;
+ iov_for_each(iov, i, *iter) {
+ unsigned long uaddr = (unsigned long) iov.iov_base;
+ unsigned long len = iov.iov_len;
unsigned long end = (uaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
unsigned long start = uaddr >> PAGE_SHIFT;
@@ -1279,9 +1278,9 @@ static struct bio *__bio_map_user_iov(struct request_queue *q,
if (!pages)
goto out;
- for (i = 0; i < iov_count; i++) {
- unsigned long uaddr = (unsigned long)iov[i].iov_base;
- unsigned long len = iov[i].iov_len;
+ iov_for_each(iov, i, *iter) {
+ unsigned long uaddr = (unsigned long) iov.iov_base;
+ unsigned long len = iov.iov_len;
unsigned long end = (uaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
unsigned long start = uaddr >> PAGE_SHIFT;
const int local_nr_pages = end - start;
@@ -1336,10 +1335,10 @@ static struct bio *__bio_map_user_iov(struct request_queue *q,
return bio;
out_unmap:
- for (i = 0; i < nr_pages; i++) {
- if(!pages[i])
+ for (j = 0; j < nr_pages; j++) {
+ if(!pages[j])
break;
- page_cache_release(pages[i]);
+ page_cache_release(pages[j]);
}
out:
kfree(pages);
@@ -1363,12 +1362,15 @@ struct bio *bio_map_user(struct request_queue *q, struct block_device *bdev,
unsigned long uaddr, unsigned int len, int write_to_vm,
gfp_t gfp_mask)
{
- struct sg_iovec iov;
+ struct iovec iov;
+ struct iov_iter i;
- iov.iov_base = (void __user *)uaddr;
+ iov.iov_base = (void __user *) uaddr;
iov.iov_len = len;
- return bio_map_user_iov(q, bdev, &iov, 1, write_to_vm, gfp_mask);
+ iov_iter_init(&i, write_to_vm ? WRITE : READ, &iov, 1, len);
+
+ return bio_map_user_iov(q, bdev, &i, write_to_vm, gfp_mask);
}
EXPORT_SYMBOL(bio_map_user);
@@ -1385,13 +1387,12 @@ EXPORT_SYMBOL(bio_map_user);
* device. Returns an error pointer in case of error.
*/
struct bio *bio_map_user_iov(struct request_queue *q, struct block_device *bdev,
- const struct sg_iovec *iov, int iov_count,
+ const struct iov_iter *iter,
int write_to_vm, gfp_t gfp_mask)
{
struct bio *bio;
- bio = __bio_map_user_iov(q, bdev, iov, iov_count, write_to_vm,
- gfp_mask);
+ bio = __bio_map_user_iov(q, bdev, iter, write_to_vm, gfp_mask);
if (IS_ERR(bio))
return bio;