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Commit ac6fc48c authored by Dan Williams's avatar Dan Williams Committed by Jens Axboe
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block: move blk_integrity to request_queue 



A trace like the following proceeds a crash in bio_integrity_process()
when it goes to use an already freed blk_integrity profile.

 BUG: unable to handle kernel paging request at ffff8800d31b10d8
 IP: [<ffff8800d31b10d8>] 0xffff8800d31b10d8
 PGD 2f65067 PUD 21fffd067 PMD 80000000d30001e3
 Oops: 0011 [#1] SMP
 Dumping ftrace buffer:
 ---------------------------------
    ndctl-2222    2.... 44526245us : disk_release: pmem1s
 systemd--2223    4.... 44573945us : bio_integrity_endio: pmem1s
    <...>-409     4.... 44574005us : bio_integrity_process: pmem1s
 ---------------------------------
[..]
  Call Trace:
  [<ffffffff8144e0f9>] ? bio_integrity_process+0x159/0x2d0
  [<ffffffff8144e4f6>] bio_integrity_verify_fn+0x36/0x60
  [<ffffffff810bd2dc>] process_one_work+0x1cc/0x4e0

Given that a request_queue is pinned while i/o is in flight and that a
gendisk is allowed to have a shorter lifetime, move blk_integrity to
request_queue to satisfy requests arriving after the gendisk has been
torn down.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
[martin: fix the CONFIG_BLK_DEV_INTEGRITY=n case]
Tested-by: default avatarRoss Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 3ef28e83

block/blk-integrity.c

+7 −7
Original line number Diff line number Diff line
@@ -142,8 +142,8 @@ EXPORT_SYMBOL(blk_rq_map_integrity_sg); 
 */

int blk_integrity_compare(struct gendisk *gd1, struct gendisk *gd2)

{

	struct blk_integrity *b1 = &gd1->integrity;

	struct blk_integrity *b2 = &gd2->integrity;

	struct blk_integrity *b1 = &gd1->queue->integrity;

	struct blk_integrity *b2 = &gd2->queue->integrity;



	if (!b1->profile && !b2->profile)

		return 0;
@@ -246,7 +246,7 @@ static ssize_t integrity_attr_show(struct kobject *kobj, struct attribute *attr, 
				   char *page)

{

	struct gendisk *disk = container_of(kobj, struct gendisk, integrity_kobj);

	struct blk_integrity *bi = &disk->integrity;

	struct blk_integrity *bi = &disk->queue->integrity;

	struct integrity_sysfs_entry *entry =

		container_of(attr, struct integrity_sysfs_entry, attr);
@@ -258,7 +258,7 @@ static ssize_t integrity_attr_store(struct kobject *kobj, 
				    size_t count)

{

	struct gendisk *disk = container_of(kobj, struct gendisk, integrity_kobj);

	struct blk_integrity *bi = &disk->integrity;

	struct blk_integrity *bi = &disk->queue->integrity;

	struct integrity_sysfs_entry *entry =

		container_of(attr, struct integrity_sysfs_entry, attr);

	ssize_t ret = 0;
@@ -397,7 +397,7 @@ static struct kobj_type integrity_ktype = { 
 */

void blk_integrity_register(struct gendisk *disk, struct blk_integrity *template)

{

	struct blk_integrity *bi = &disk->integrity;

	struct blk_integrity *bi = &disk->queue->integrity;



	bi->flags = BLK_INTEGRITY_VERIFY | BLK_INTEGRITY_GENERATE |

		template->flags;
@@ -420,13 +420,13 @@ EXPORT_SYMBOL(blk_integrity_register); 
void blk_integrity_unregister(struct gendisk *disk)

{

	blk_integrity_revalidate(disk);

	memset(&disk->integrity, 0, sizeof(struct blk_integrity));

	memset(&disk->queue->integrity, 0, sizeof(struct blk_integrity));

}

EXPORT_SYMBOL(blk_integrity_unregister);



void blk_integrity_revalidate(struct gendisk *disk)

{

	struct blk_integrity *bi = &disk->integrity;

	struct blk_integrity *bi = &disk->queue->integrity;



	if (!(disk->flags & GENHD_FL_UP))

		return;

drivers/nvme/host/pci.c

+1 −1
Original line number Diff line number Diff line
@@ -538,7 +538,7 @@ static void nvme_dif_remap(struct request *req, 
	virt = bip_get_seed(bip);

	phys = nvme_block_nr(ns, blk_rq_pos(req));

	nlb = (blk_rq_bytes(req) >> ns->lba_shift);

	ts = ns->disk->integrity.tuple_size;

	ts = ns->disk->queue->integrity.tuple_size;



	for (i = 0; i < nlb; i++, virt++, phys++) {

		pi = (struct t10_pi_tuple *)p;

include/linux/blkdev.h

+5 −1
Original line number Diff line number Diff line
@@ -369,6 +369,10 @@ struct request_queue { 
	 */

	struct kobject mq_kobj;



#ifdef  CONFIG_BLK_DEV_INTEGRITY

	struct blk_integrity integrity;

#endif	/* CONFIG_BLK_DEV_INTEGRITY */



#ifdef CONFIG_PM

	struct device		*dev;

	int			rpm_status;
@@ -1481,7 +1485,7 @@ extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, 


static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)

{

	struct blk_integrity *bi = &disk->integrity;

	struct blk_integrity *bi = &disk->queue->integrity;



	if (!bi->profile)

		return NULL;

include/linux/genhd.h

+0 −1
Original line number Diff line number Diff line
@@ -210,7 +210,6 @@ struct gendisk { 
	atomic_t sync_io;		/* RAID */

	struct disk_events *ev;

#ifdef  CONFIG_BLK_DEV_INTEGRITY

	struct blk_integrity integrity;

	struct kobject integrity_kobj;

#endif	/* CONFIG_BLK_DEV_INTEGRITY */

	int node_id;