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authorAl Viro <viro@zeniv.linux.org.uk>2017-09-23 16:13:10 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2017-10-11 17:23:38 -0400
commit629e42bcc3d0bc04b4e0e40ef3f831507a4693bd (patch)
treec4b5383c8f2bf48e1a537d8d45283a3759ef05f6 /block/bio.c
parent076098e51bd502402a7c166b5c2bb59a196e84e1 (diff)
... and with iov_iter_get_pages_alloc() it becomes even simpler
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'block/bio.c')
-rw-r--r--block/bio.c21
1 files changed, 5 insertions, 16 deletions
diff --git a/block/bio.c b/block/bio.c
index 5de54dedab66..5dbc5e90d716 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1325,9 +1325,7 @@ struct bio *bio_map_user_iov(struct request_queue *q,
{
int j;
int nr_pages = 0;
- struct page **pages;
struct bio *bio;
- int cur_page = 0;
int ret;
struct iov_iter i;
struct iovec iov;
@@ -1360,19 +1358,14 @@ struct bio *bio_map_user_iov(struct request_queue *q,
if (!bio)
return ERR_PTR(-ENOMEM);
- ret = -ENOMEM;
- pages = kcalloc(nr_pages, sizeof(struct page *), gfp_mask);
- if (!pages)
- goto out;
-
i = *iter;
while (iov_iter_count(&i)) {
+ struct page **pages;
ssize_t bytes;
size_t offs, added = 0;
int npages;
- bytes = iov_iter_get_pages(&i, pages + cur_page, LONG_MAX,
- nr_pages - cur_page, &offs);
+ bytes = iov_iter_get_pages_alloc(&i, &pages, LONG_MAX, &offs);
if (unlikely(bytes <= 0)) {
ret = bytes ? bytes : -EFAULT;
goto out_unmap;
@@ -1380,7 +1373,7 @@ struct bio *bio_map_user_iov(struct request_queue *q,
npages = DIV_ROUND_UP(offs + bytes, PAGE_SIZE);
- for (j = cur_page; j < cur_page + npages; j++) {
+ for (j = 0; j < npages; j++) {
unsigned int n = PAGE_SIZE - offs;
unsigned short prev_bi_vcnt = bio->bi_vcnt;
@@ -1409,13 +1402,11 @@ struct bio *bio_map_user_iov(struct request_queue *q,
/*
* release the pages we didn't map into the bio, if any
*/
- while (j < cur_page + npages)
+ while (j < npages)
put_page(pages[j++]);
- cur_page = j;
+ kvfree(pages);
}
- kfree(pages);
-
bio_set_flag(bio, BIO_USER_MAPPED);
/*
@@ -1431,8 +1422,6 @@ struct bio *bio_map_user_iov(struct request_queue *q,
bio_for_each_segment_all(bvec, bio, j) {
put_page(bvec->bv_page);
}
- out:
- kfree(pages);
bio_put(bio);
return ERR_PTR(ret);
}