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-rw-r--r--fs/bio.c48
1 files changed, 33 insertions, 15 deletions
diff --git a/fs/bio.c b/fs/bio.c
index 8000e2fa16cb..3cba7ae34d75 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -469,20 +469,21 @@ static void bio_free_map_data(struct bio_map_data *bmd)
kfree(bmd);
}
-static struct bio_map_data *bio_alloc_map_data(int nr_segs, int iov_count)
+static struct bio_map_data *bio_alloc_map_data(int nr_segs, int iov_count,
+ gfp_t gfp_mask)
{
- struct bio_map_data *bmd = kmalloc(sizeof(*bmd), GFP_KERNEL);
+ struct bio_map_data *bmd = kmalloc(sizeof(*bmd), gfp_mask);
if (!bmd)
return NULL;
- bmd->iovecs = kmalloc(sizeof(struct bio_vec) * nr_segs, GFP_KERNEL);
+ bmd->iovecs = kmalloc(sizeof(struct bio_vec) * nr_segs, gfp_mask);
if (!bmd->iovecs) {
kfree(bmd);
return NULL;
}
- bmd->sgvecs = kmalloc(sizeof(struct sg_iovec) * iov_count, GFP_KERNEL);
+ bmd->sgvecs = kmalloc(sizeof(struct sg_iovec) * iov_count, gfp_mask);
if (bmd->sgvecs)
return bmd;
@@ -491,8 +492,8 @@ static struct bio_map_data *bio_alloc_map_data(int nr_segs, int iov_count)
return NULL;
}
-static int __bio_copy_iov(struct bio *bio, struct sg_iovec *iov, int iov_count,
- int uncopy)
+static int __bio_copy_iov(struct bio *bio, struct bio_vec *iovecs,
+ struct sg_iovec *iov, int iov_count, int uncopy)
{
int ret = 0, i;
struct bio_vec *bvec;
@@ -502,7 +503,7 @@ static int __bio_copy_iov(struct bio *bio, struct sg_iovec *iov, int iov_count,
__bio_for_each_segment(bvec, bio, i, 0) {
char *bv_addr = page_address(bvec->bv_page);
- unsigned int bv_len = bvec->bv_len;
+ unsigned int bv_len = iovecs[i].bv_len;
while (bv_len && iov_idx < iov_count) {
unsigned int bytes;
@@ -554,7 +555,7 @@ int bio_uncopy_user(struct bio *bio)
struct bio_map_data *bmd = bio->bi_private;
int ret;
- ret = __bio_copy_iov(bio, bmd->sgvecs, bmd->nr_sgvecs, 1);
+ ret = __bio_copy_iov(bio, bmd->iovecs, bmd->sgvecs, bmd->nr_sgvecs, 1);
bio_free_map_data(bmd);
bio_put(bio);
@@ -596,7 +597,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q, struct sg_iovec *iov,
len += iov[i].iov_len;
}
- bmd = bio_alloc_map_data(nr_pages, iov_count);
+ bmd = bio_alloc_map_data(nr_pages, iov_count, GFP_KERNEL);
if (!bmd)
return ERR_PTR(-ENOMEM);
@@ -633,7 +634,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q, struct sg_iovec *iov,
* success
*/
if (!write_to_vm) {
- ret = __bio_copy_iov(bio, iov, iov_count, 0);
+ ret = __bio_copy_iov(bio, bio->bi_io_vec, iov, iov_count, 0);
if (ret)
goto cleanup;
}
@@ -942,19 +943,22 @@ static void bio_copy_kern_endio(struct bio *bio, int err)
{
struct bio_vec *bvec;
const int read = bio_data_dir(bio) == READ;
- char *p = bio->bi_private;
+ struct bio_map_data *bmd = bio->bi_private;
int i;
+ char *p = bmd->sgvecs[0].iov_base;
__bio_for_each_segment(bvec, bio, i, 0) {
char *addr = page_address(bvec->bv_page);
+ int len = bmd->iovecs[i].bv_len;
if (read && !err)
- memcpy(p, addr, bvec->bv_len);
+ memcpy(p, addr, len);
__free_page(bvec->bv_page);
- p += bvec->bv_len;
+ p += len;
}
+ bio_free_map_data(bmd);
bio_put(bio);
}
@@ -978,11 +982,21 @@ struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len,
const int nr_pages = end - start;
struct bio *bio;
struct bio_vec *bvec;
+ struct bio_map_data *bmd;
int i, ret;
+ struct sg_iovec iov;
+
+ iov.iov_base = data;
+ iov.iov_len = len;
+
+ bmd = bio_alloc_map_data(nr_pages, 1, gfp_mask);
+ if (!bmd)
+ return ERR_PTR(-ENOMEM);
+ ret = -ENOMEM;
bio = bio_alloc(gfp_mask, nr_pages);
if (!bio)
- return ERR_PTR(-ENOMEM);
+ goto out_bmd;
while (len) {
struct page *page;
@@ -1016,14 +1030,18 @@ struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len,
}
}
- bio->bi_private = data;
+ bio->bi_private = bmd;
bio->bi_end_io = bio_copy_kern_endio;
+
+ bio_set_map_data(bmd, bio, &iov, 1);
return bio;
cleanup:
bio_for_each_segment(bvec, bio, i)
__free_page(bvec->bv_page);
bio_put(bio);
+out_bmd:
+ bio_free_map_data(bmd);
return ERR_PTR(ret);
}