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block: turn bio_kmalloc into a simple kmalloc wrapper 

Remove the magic autofree semantics and require the callers to explicitly
call bio_init to initialize the bio.

This allows bio_free to catch accidental bio_put calls on bio_init()ed
bios as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Coly Li <colyli@suse.de>
Acked-by: Mike Snitzer <snitzer@kernel.org>
Link: https://lore.kernel.org/r/20220406061228.410163-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-04-06 08:12:27 +02:00 committed by Jens Axboe
parent 7655db8093
commit 066ff57101
11 changed files with 112 additions and 95 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
block/bio.c
View File

@ -224,24 +224,13 @@ EXPORT_SYMBOL(bio_uninit);
static void bio_free(struct bio *bio)
{
struct bio_set *bs = bio->bi_pool;
void *p;
void *p = bio;
WARN_ON_ONCE(!bs);
bio_uninit(bio);
if (bs) {
bvec_free(&bs->bvec_pool, bio->bi_io_vec, bio->bi_max_vecs);
/*
* If we have front padding, adjust the bio pointer before freeing
*/
p = bio;
p -= bs->front_pad;
mempool_free(p, &bs->bio_pool);
} else {
/* Bio was allocated by bio_kmalloc() */
kfree(bio);
}
bvec_free(&bs->bvec_pool, bio->bi_io_vec, bio->bi_max_vecs);
mempool_free(p - bs->front_pad, &bs->bio_pool);
}
/*
@ -568,28 +557,28 @@ err_free:
EXPORT_SYMBOL(bio_alloc_bioset);
/**
* bio_kmalloc - kmalloc a bio for I/O
* bio_kmalloc - kmalloc a bio
* @nr_vecs: number of bio_vecs to allocate
* @gfp_mask: the GFP_* mask given to the slab allocator
* @nr_iovecs: number of iovecs to pre-allocate
*
* Use kmalloc to allocate and initialize a bio.
* Use kmalloc to allocate a bio (including bvecs). The bio must be initialized
* using bio_init() before use. To free a bio returned from this function use
* kfree() after calling bio_uninit(). A bio returned from this function can
* be reused by calling bio_uninit() before calling bio_init() again.
*
* Note that unlike bio_alloc() or bio_alloc_bioset() allocations from this
* function are not backed by a mempool can can fail. Do not use this function
* for allocations in the file system I/O path.
*
* Returns: Pointer to new bio on success, NULL on failure.
*/
struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned short nr_iovecs)
struct bio *bio_kmalloc(unsigned short nr_vecs, gfp_t gfp_mask)
{
struct bio *bio;
if (nr_iovecs > UIO_MAXIOV)
if (nr_vecs > UIO_MAXIOV)
return NULL;
bio = kmalloc(struct_size(bio, bi_inline_vecs, nr_iovecs), gfp_mask);
if (unlikely(!bio))
return NULL;
bio_init(bio, NULL, nr_iovecs ? bio->bi_inline_vecs : NULL, nr_iovecs,
0);
bio->bi_pool = NULL;
return bio;
return kmalloc(struct_size(bio, bi_inline_vecs, nr_vecs), gfp_mask);
}
EXPORT_SYMBOL(bio_kmalloc);

14
block/blk-crypto-fallback.c
View File

@ -152,23 +152,25 @@ static void blk_crypto_fallback_encrypt_endio(struct bio *enc_bio)
src_bio->bi_status = enc_bio->bi_status;
bio_put(enc_bio);
bio_uninit(enc_bio);
kfree(enc_bio);
bio_endio(src_bio);
}
static struct bio *blk_crypto_fallback_clone_bio(struct bio *bio_src)
{
unsigned int nr_segs = bio_segments(bio_src);
struct bvec_iter iter;
struct bio_vec bv;
struct bio *bio;
bio = bio_kmalloc(GFP_NOIO, bio_segments(bio_src));
bio = bio_kmalloc(nr_segs, GFP_NOIO);
if (!bio)
return NULL;
bio->bi_bdev = bio_src->bi_bdev;
bio_init(bio, bio_src->bi_bdev, bio->bi_inline_vecs, nr_segs,
bio_src->bi_opf);
if (bio_flagged(bio_src, BIO_REMAPPED))
bio_set_flag(bio, BIO_REMAPPED);
bio->bi_opf = bio_src->bi_opf;
bio->bi_ioprio = bio_src->bi_ioprio;
bio->bi_iter.bi_sector = bio_src->bi_iter.bi_sector;
bio->bi_iter.bi_size = bio_src->bi_iter.bi_size;
@ -363,8 +365,8 @@ out_release_keyslot:
blk_crypto_put_keyslot(slot);
out_put_enc_bio:
if (enc_bio)
bio_put(enc_bio);
bio_uninit(enc_bio);
kfree(enc_bio);
return ret;
}

42
block/blk-map.c
View File

@ -152,10 +152,10 @@ static int bio_copy_user_iov(struct request *rq, struct rq_map_data *map_data,
nr_pages = bio_max_segs(DIV_ROUND_UP(offset + len, PAGE_SIZE));
ret = -ENOMEM;
bio = bio_kmalloc(gfp_mask, nr_pages);
bio = bio_kmalloc(nr_pages, gfp_mask);
if (!bio)
goto out_bmd;
bio->bi_opf |= req_op(rq);
bio_init(bio, NULL, bio->bi_inline_vecs, nr_pages, req_op(rq));
if (map_data) {
nr_pages = 1 << map_data->page_order;
@ -224,7 +224,8 @@ static int bio_copy_user_iov(struct request *rq, struct rq_map_data *map_data,
cleanup:
if (!map_data)
bio_free_pages(bio);
bio_put(bio);
bio_uninit(bio);
kfree(bio);
out_bmd:
kfree(bmd);
return ret;
@ -234,6 +235,7 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
gfp_t gfp_mask)
{
unsigned int max_sectors = queue_max_hw_sectors(rq->q);
unsigned int nr_vecs = iov_iter_npages(iter, BIO_MAX_VECS);
struct bio *bio;
int ret;
int j;
@ -241,10 +243,10 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
if (!iov_iter_count(iter))
return -EINVAL;
bio = bio_kmalloc(gfp_mask, iov_iter_npages(iter, BIO_MAX_VECS));
bio = bio_kmalloc(nr_vecs, gfp_mask);
if (!bio)
return -ENOMEM;
bio->bi_opf |= req_op(rq);
bio_init(bio, NULL, bio->bi_inline_vecs, nr_vecs, req_op(rq));
while (iov_iter_count(iter)) {
struct page **pages;
@ -303,7 +305,8 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
out_unmap:
bio_release_pages(bio, false);
bio_put(bio);
bio_uninit(bio);
kfree(bio);
return ret;
}
@ -323,7 +326,8 @@ static void bio_invalidate_vmalloc_pages(struct bio *bio)
static void bio_map_kern_endio(struct bio *bio)
{
bio_invalidate_vmalloc_pages(bio);
bio_put(bio);
bio_uninit(bio);
kfree(bio);
}
/**
@ -348,9 +352,10 @@ static struct bio *bio_map_kern(struct request_queue *q, void *data,
int offset, i;
struct bio *bio;
bio = bio_kmalloc(gfp_mask, nr_pages);
bio = bio_kmalloc(nr_pages, gfp_mask);
if (!bio)
return ERR_PTR(-ENOMEM);
bio_init(bio, NULL, bio->bi_inline_vecs, nr_pages, 0);
if (is_vmalloc) {
flush_kernel_vmap_range(data, len);
@ -374,7 +379,8 @@ static struct bio *bio_map_kern(struct request_queue *q, void *data,
if (bio_add_pc_page(q, bio, page, bytes,
offset) < bytes) {
/* we don't support partial mappings */
bio_put(bio);
bio_uninit(bio);
kfree(bio);
return ERR_PTR(-EINVAL);
}
@ -390,7 +396,8 @@ static struct bio *bio_map_kern(struct request_queue *q, void *data,
static void bio_copy_kern_endio(struct bio *bio)
{
bio_free_pages(bio);
bio_put(bio);
bio_uninit(bio);
kfree(bio);
}
static void bio_copy_kern_endio_read(struct bio *bio)
@ -435,9 +442,10 @@ static struct bio *bio_copy_kern(struct request_queue *q, void *data,
return ERR_PTR(-EINVAL);
nr_pages = end - start;
bio = bio_kmalloc(gfp_mask, nr_pages);
bio = bio_kmalloc(nr_pages, gfp_mask);
if (!bio)
return ERR_PTR(-ENOMEM);
bio_init(bio, NULL, bio->bi_inline_vecs, nr_pages, 0);
while (len) {
struct page *page;
@ -471,7 +479,8 @@ static struct bio *bio_copy_kern(struct request_queue *q, void *data,
cleanup:
bio_free_pages(bio);
bio_put(bio);
bio_uninit(bio);
kfree(bio);
return ERR_PTR(-ENOMEM);
}
@ -602,7 +611,8 @@ int blk_rq_unmap_user(struct bio *bio)
next_bio = bio;
bio = bio->bi_next;
bio_put(next_bio);
bio_uninit(next_bio);
kfree(next_bio);
}
return ret;
@ -648,8 +658,10 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
bio->bi_opf |= req_op(rq);
ret = blk_rq_append_bio(rq, bio);
if (unlikely(ret))
bio_put(bio);
if (unlikely(ret)) {
bio_uninit(bio);
kfree(bio);
}
return ret;
}
EXPORT_SYMBOL(blk_rq_map_kern);

25
drivers/block/pktcdvd.c
View File

@ -522,9 +522,10 @@ static struct packet_data *pkt_alloc_packet_data(int frames)
goto no_pkt;
pkt->frames = frames;
pkt->w_bio = bio_kmalloc(GFP_KERNEL, frames);
pkt->w_bio = bio_kmalloc(frames, GFP_KERNEL);
if (!pkt->w_bio)
goto no_bio;
bio_init(pkt->w_bio, NULL, pkt->w_bio->bi_inline_vecs, frames, 0);
for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
@ -536,10 +537,10 @@ static struct packet_data *pkt_alloc_packet_data(int frames)
bio_list_init(&pkt->orig_bios);
for (i = 0; i < frames; i++) {
struct bio *bio = bio_kmalloc(GFP_KERNEL, 1);
struct bio *bio = bio_kmalloc(1, GFP_KERNEL);
if (!bio)
goto no_rd_bio;
bio_init(bio, NULL, bio->bi_inline_vecs, 1, 0);
pkt->r_bios[i] = bio;
}
@ -547,16 +548,16 @@ static struct packet_data *pkt_alloc_packet_data(int frames)
no_rd_bio:
for (i = 0; i < frames; i++) {
struct bio *bio = pkt->r_bios[i];
if (bio)
bio_put(bio);
if (pkt->r_bios[i])
bio_uninit(pkt->r_bios[i]);
kfree(pkt->r_bios[i]);
}
no_page:
for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
if (pkt->pages[i])
__free_page(pkt->pages[i]);
bio_put(pkt->w_bio);
bio_uninit(pkt->w_bio);
kfree(pkt->w_bio);
no_bio:
kfree(pkt);
no_pkt:
@ -571,13 +572,13 @@ static void pkt_free_packet_data(struct packet_data *pkt)
int i;
for (i = 0; i < pkt->frames; i++) {
struct bio *bio = pkt->r_bios[i];
if (bio)
bio_put(bio);
bio_uninit(pkt->r_bios[i]);
kfree(pkt->r_bios[i]);
}
for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
__free_page(pkt->pages[i]);
bio_put(pkt->w_bio);
bio_uninit(pkt->w_bio);
kfree(pkt->w_bio);
kfree(pkt);
}

10
drivers/md/bcache/debug.c
View File

@ -107,15 +107,16 @@ void bch_btree_verify(struct btree *b)
void bch_data_verify(struct cached_dev *dc, struct bio *bio)
{
unsigned int nr_segs = bio_segments(bio);
struct bio *check;
struct bio_vec bv, cbv;
struct bvec_iter iter, citer = { 0 };
check = bio_kmalloc(GFP_NOIO, bio_segments(bio));
check = bio_kmalloc(nr_segs, GFP_NOIO);
if (!check)
return;
bio_set_dev(check, bio->bi_bdev);
check->bi_opf = REQ_OP_READ;
bio_init(check, bio->bi_bdev, check->bi_inline_vecs, nr_segs,
REQ_OP_READ);
check->bi_iter.bi_sector = bio->bi_iter.bi_sector;
check->bi_iter.bi_size = bio->bi_iter.bi_size;
@ -146,7 +147,8 @@ void bch_data_verify(struct cached_dev *dc, struct bio *bio)
bio_free_pages(check);
out_put:
bio_put(check);
bio_uninit(check);
kfree(check);
}
#endif

9
drivers/md/dm-bufio.c
View File

@ -611,7 +611,8 @@ static void bio_complete(struct bio *bio)
{
struct dm_buffer *b = bio->bi_private;
blk_status_t status = bio->bi_status;
bio_put(bio);
bio_uninit(bio);
kfree(bio);
b->end_io(b, status);
}
@ -626,16 +627,14 @@ static void use_bio(struct dm_buffer *b, int rw, sector_t sector,
if (unlikely(b->c->sectors_per_block_bits < PAGE_SHIFT - SECTOR_SHIFT))
vec_size += 2;
bio = bio_kmalloc(GFP_NOWAIT | __GFP_NORETRY | __GFP_NOWARN, vec_size);
bio = bio_kmalloc(vec_size, GFP_NOWAIT | __GFP_NORETRY | __GFP_NOWARN);
if (!bio) {
dmio:
use_dmio(b, rw, sector, n_sectors, offset);
return;
}
bio_init(bio, b->c->bdev, bio->bi_inline_vecs, vec_size, rw);
bio->bi_iter.bi_sector = sector;
bio_set_dev(bio, b->c->bdev);
bio_set_op_attrs(bio, rw, 0);
bio->bi_end_io = bio_complete;
bio->bi_private = b;

12
drivers/md/raid1.c
View File

@ -165,9 +165,10 @@ static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data)
* Allocate bios : 1 for reading, n-1 for writing
*/
for (j = pi->raid_disks ; j-- ; ) {
bio = bio_kmalloc(gfp_flags, RESYNC_PAGES);
bio = bio_kmalloc(RESYNC_PAGES, gfp_flags);
if (!bio)
goto out_free_bio;
bio_init(bio, NULL, bio->bi_inline_vecs, RESYNC_PAGES, 0);
r1_bio->bios[j] = bio;
}
/*
@ -206,8 +207,10 @@ out_free_pages:
resync_free_pages(&rps[j]);
out_free_bio:
while (++j < pi->raid_disks)
bio_put(r1_bio->bios[j]);
while (++j < pi->raid_disks) {
bio_uninit(r1_bio->bios[j]);
kfree(r1_bio->bios[j]);
}
kfree(rps);
out_free_r1bio:
@ -225,7 +228,8 @@ static void r1buf_pool_free(void *__r1_bio, void *data)
for (i = pi->raid_disks; i--; ) {
rp = get_resync_pages(r1bio->bios[i]);
resync_free_pages(rp);
bio_put(r1bio->bios[i]);
bio_uninit(r1bio->bios[i]);
kfree(r1bio->bios[i]);
}
/* resync pages array stored in the 1st bio's .bi_private */

21
drivers/md/raid10.c
View File

@ -145,15 +145,17 @@ static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data)
* Allocate bios.
*/
for (j = nalloc ; j-- ; ) {
bio = bio_kmalloc(gfp_flags, RESYNC_PAGES);
bio = bio_kmalloc(RESYNC_PAGES, gfp_flags);
if (!bio)
goto out_free_bio;
bio_init(bio, NULL, bio->bi_inline_vecs, RESYNC_PAGES, 0);
r10_bio->devs[j].bio = bio;
if (!conf->have_replacement)
continue;
bio = bio_kmalloc(gfp_flags, RESYNC_PAGES);
bio = bio_kmalloc(RESYNC_PAGES, gfp_flags);
if (!bio)
goto out_free_bio;
bio_init(bio, NULL, bio->bi_inline_vecs, RESYNC_PAGES, 0);
r10_bio->devs[j].repl_bio = bio;
}
/*
@ -197,9 +199,11 @@ out_free_pages:
out_free_bio:
for ( ; j < nalloc; j++) {
if (r10_bio->devs[j].bio)
bio_put(r10_bio->devs[j].bio);
bio_uninit(r10_bio->devs[j].bio);
kfree(r10_bio->devs[j].bio);
if (r10_bio->devs[j].repl_bio)
bio_put(r10_bio->devs[j].repl_bio);
bio_uninit(r10_bio->devs[j].repl_bio);
kfree(r10_bio->devs[j].repl_bio);
}
kfree(rps);
out_free_r10bio:
@ -220,12 +224,15 @@ static void r10buf_pool_free(void *__r10_bio, void *data)
if (bio) {
rp = get_resync_pages(bio);
resync_free_pages(rp);
bio_put(bio);
bio_uninit(bio);
kfree(bio);
}
bio = r10bio->devs[j].repl_bio;
if (bio)
bio_put(bio);
if (bio) {
bio_uninit(bio);
kfree(bio);
}
}
/* resync pages array stored in the 1st bio's .bi_private */

10
drivers/target/target_core_pscsi.c
View File

@ -818,7 +818,8 @@ static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
static void pscsi_bi_endio(struct bio *bio)
{
bio_put(bio);
bio_uninit(bio);
kfree(bio);
}
static sense_reason_t
@ -861,14 +862,13 @@ pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
if (!bio) {
new_bio:
nr_vecs = bio_max_segs(nr_pages);
bio = bio_kmalloc(GFP_KERNEL, nr_vecs);
bio = bio_kmalloc(nr_vecs, GFP_KERNEL);
if (!bio)
goto fail;
bio_init(bio, NULL, bio->bi_inline_vecs, nr_vecs,
rw ? REQ_OP_WRITE : REQ_OP_READ);
bio->bi_end_io = pscsi_bi_endio;
if (rw)
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
pr_debug("PSCSI: Allocated bio: %p,"
" dir: %s nr_vecs: %d\n", bio,
(rw) ? "rw" : "r", nr_vecs);

15
fs/squashfs/block.c
View File

@ -86,12 +86,10 @@ static int squashfs_bio_read(struct super_block *sb, u64 index, int length,
int error, i;
struct bio *bio;
bio = bio_kmalloc(GFP_NOIO, page_count);
bio = bio_kmalloc(page_count, GFP_NOIO);
if (!bio)
return -ENOMEM;
bio_set_dev(bio, sb->s_bdev);
bio->bi_opf = REQ_OP_READ;
bio_init(bio, sb->s_bdev, bio->bi_inline_vecs, page_count, REQ_OP_READ);
bio->bi_iter.bi_sector = block * (msblk->devblksize >> SECTOR_SHIFT);
for (i = 0; i < page_count; ++i) {
@ -121,7 +119,8 @@ static int squashfs_bio_read(struct super_block *sb, u64 index, int length,
out_free_bio:
bio_free_pages(bio);
bio_put(bio);
bio_uninit(bio);
kfree(bio);
return error;
}
@ -185,7 +184,8 @@ int squashfs_read_data(struct super_block *sb, u64 index, int length,
length |= data[0] << 8;
}
bio_free_pages(bio);
bio_put(bio);
bio_uninit(bio);
kfree(bio);
compressed = SQUASHFS_COMPRESSED(length);
length = SQUASHFS_COMPRESSED_SIZE(length);
@ -219,7 +219,8 @@ int squashfs_read_data(struct super_block *sb, u64 index, int length,
out_free_bio:
bio_free_pages(bio);
bio_put(bio);
bio_uninit(bio);
kfree(bio);
out:
if (res < 0) {
ERROR("Failed to read block 0x%llx: %d\n", index, res);

2
include/linux/bio.h
View File

@ -405,7 +405,7 @@ extern int bioset_init_from_src(struct bio_set *bs, struct bio_set *src);
struct bio *bio_alloc_bioset(struct block_device *bdev, unsigned short nr_vecs,
unsigned int opf, gfp_t gfp_mask,
struct bio_set *bs);
struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned short nr_iovecs);
struct bio *bio_kmalloc(unsigned short nr_vecs, gfp_t gfp_mask);
extern void bio_put(struct bio *);
struct bio *bio_alloc_clone(struct block_device *bdev, struct bio *bio_src,