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for-linus-20180302

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Merge tag 'for-linus-20180302' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "A collection of fixes for this series. This is a little larger than
  usual at this time, but that's mainly because I was out on vacation
  last week. Nothing in here is major in any way, it's just two weeks of
  fixes. This contains:

   - NVMe pull from Keith, with a set of fixes from the usual suspects.

   - mq-deadline zone unlock fix from Damien, fixing an issue with the
     SMR zone locking added for 4.16.

   - two bcache fixes sent in by Michael, with changes from Coly and
     Tang.

   - comment typo fix from Eric for blktrace.

   - return-value error handling fix for nbd, from Gustavo.

   - fix a direct-io case where we don't defer to a completion handler,
     making us sleep from IRQ device completion. From Jan.

   - a small series from Jan fixing up holes around handling of bdev
     references.

   - small set of regression fixes from Jiufei, mostly fixing problems
     around the gendisk pointer -> partition index change.

   - regression fix from Ming, fixing a boundary issue with the discard
     page cache invalidation.

   - two-patch series from Ming, fixing both a core blk-mq-sched and
     kyber issue around token freeing on a requeue condition"

* tag 'for-linus-20180302' of git://git.kernel.dk/linux-block: (24 commits)
  block: fix a typo
  block: display the correct diskname for bio
  block: fix the count of PGPGOUT for WRITE_SAME
  mq-deadline: Make sure to always unlock zones
  nvmet: fix PSDT field check in command format
  nvme-multipath: fix sysfs dangerously created links
  nbd: fix return value in error handling path
  bcache: fix kcrashes with fio in RAID5 backend dev
  bcache: correct flash only vols (check all uuids)
  blktrace_api.h: fix comment for struct blk_user_trace_setup
  blockdev: Avoid two active bdev inodes for one device
  genhd: Fix BUG in blkdev_open()
  genhd: Fix use after free in __blkdev_get()
  genhd: Add helper put_disk_and_module()
  genhd: Rename get_disk() to get_disk_and_module()
  genhd: Fix leaked module reference for NVME devices
  direct-io: Fix sleep in atomic due to sync AIO
  nvme-pci: Fix nvme queue cleanup if IRQ setup fails
  block: kyber: fix domain token leak during requeue
  blk-mq: don't call io sched's .requeue_request when requeueing rq to ->dispatch
  ...
This commit is contained in:
Linus Torvalds 2018-03-02 09:35:36 -08:00
commit fb6d47a592
32 changed files with 145 additions and 82 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
block/blk-cgroup.c
View File

@ -812,7 +812,6 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
struct gendisk *disk;
struct request_queue *q;
struct blkcg_gq *blkg;
struct module *owner;
unsigned int major, minor;
int key_len, part, ret;
char *body;
@ -904,9 +903,7 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
spin_unlock_irq(q->queue_lock);
rcu_read_unlock();
fail:
owner = disk->fops->owner;
put_disk(disk);
module_put(owner);
put_disk_and_module(disk);
/*
* If queue was bypassing, we should retry. Do so after a
* short msleep(). It isn't strictly necessary but queue
@ -931,13 +928,9 @@ EXPORT_SYMBOL_GPL(blkg_conf_prep);
void blkg_conf_finish(struct blkg_conf_ctx *ctx)
__releases(ctx->disk->queue->queue_lock) __releases(rcu)
{
struct module *owner;
spin_unlock_irq(ctx->disk->queue->queue_lock);
rcu_read_unlock();
owner = ctx->disk->fops->owner;
put_disk(ctx->disk);
module_put(owner);
put_disk_and_module(ctx->disk);
}
EXPORT_SYMBOL_GPL(blkg_conf_finish);

2
block/blk-core.c
View File

@ -2434,7 +2434,7 @@ blk_qc_t submit_bio(struct bio *bio)
unsigned int count;
if (unlikely(bio_op(bio) == REQ_OP_WRITE_SAME))
count = queue_logical_block_size(bio->bi_disk->queue);
count = queue_logical_block_size(bio->bi_disk->queue) >> 9;
else
count = bio_sectors(bio);

4
block/blk-mq.c
View File

@ -712,7 +712,6 @@ static void __blk_mq_requeue_request(struct request *rq)
trace_block_rq_requeue(q, rq);
wbt_requeue(q->rq_wb, &rq->issue_stat);
blk_mq_sched_requeue_request(rq);
if (blk_mq_rq_state(rq) != MQ_RQ_IDLE) {
blk_mq_rq_update_state(rq, MQ_RQ_IDLE);
@ -725,6 +724,9 @@ void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list)
{
__blk_mq_requeue_request(rq);
/* this request will be re-inserted to io scheduler queue */
blk_mq_sched_requeue_request(rq);
BUG_ON(blk_queued_rq(rq));
blk_mq_add_to_requeue_list(rq, true, kick_requeue_list);
}

48
block/genhd.c
View File

@ -547,7 +547,7 @@ static int exact_lock(dev_t devt, void *data)
{
struct gendisk *p = data;
if (!get_disk(p))
if (!get_disk_and_module(p))
return -1;
return 0;
}
@ -717,6 +717,11 @@ void del_gendisk(struct gendisk *disk)
blk_integrity_del(disk);
disk_del_events(disk);
/*
* Block lookups of the disk until all bdevs are unhashed and the
* disk is marked as dead (GENHD_FL_UP cleared).
*/
down_write(&disk->lookup_sem);
/* invalidate stuff */
disk_part_iter_init(&piter, disk,
DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
@ -731,6 +736,7 @@ void del_gendisk(struct gendisk *disk)
bdev_unhash_inode(disk_devt(disk));
set_capacity(disk, 0);
disk->flags &= ~GENHD_FL_UP;
up_write(&disk->lookup_sem);
if (!(disk->flags & GENHD_FL_HIDDEN))
sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");
@ -809,16 +815,28 @@ struct gendisk *get_gendisk(dev_t devt, int *partno)
spin_lock_bh(&ext_devt_lock);
part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt)));
if (part && get_disk(part_to_disk(part))) {
if (part && get_disk_and_module(part_to_disk(part))) {
*partno = part->partno;
disk = part_to_disk(part);
}
spin_unlock_bh(&ext_devt_lock);
}
if (disk && unlikely(disk->flags & GENHD_FL_HIDDEN)) {
put_disk(disk);
if (!disk)
return NULL;
/*
* Synchronize with del_gendisk() to not return disk that is being
* destroyed.
*/
down_read(&disk->lookup_sem);
if (unlikely((disk->flags & GENHD_FL_HIDDEN) ||
!(disk->flags & GENHD_FL_UP))) {
up_read(&disk->lookup_sem);
put_disk_and_module(disk);
disk = NULL;
} else {
up_read(&disk->lookup_sem);
}
return disk;
}
@ -1418,6 +1436,7 @@ struct gendisk *__alloc_disk_node(int minors, int node_id)
kfree(disk);
return NULL;
}
init_rwsem(&disk->lookup_sem);
disk->node_id = node_id;
if (disk_expand_part_tbl(disk, 0)) {
free_part_stats(&disk->part0);
@ -1453,7 +1472,7 @@ struct gendisk *__alloc_disk_node(int minors, int node_id)
}
EXPORT_SYMBOL(__alloc_disk_node);
struct kobject *get_disk(struct gendisk *disk)
struct kobject *get_disk_and_module(struct gendisk *disk)
{
struct module *owner;
struct kobject *kobj;
@ -1471,17 +1490,30 @@ struct kobject *get_disk(struct gendisk *disk)
return kobj;
}
EXPORT_SYMBOL(get_disk);
EXPORT_SYMBOL(get_disk_and_module);
void put_disk(struct gendisk *disk)
{
if (disk)
kobject_put(&disk_to_dev(disk)->kobj);
}
EXPORT_SYMBOL(put_disk);
/*
* This is a counterpart of get_disk_and_module() and thus also of
* get_gendisk().
*/
void put_disk_and_module(struct gendisk *disk)
{
if (disk) {
struct module *owner = disk->fops->owner;
put_disk(disk);
module_put(owner);
}
}
EXPORT_SYMBOL(put_disk_and_module);
static void set_disk_ro_uevent(struct gendisk *gd, int ro)
{
char event[] = "DISK_RO=1";

2
block/ioctl.c
View File

@ -225,7 +225,7 @@ static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
if (start + len > i_size_read(bdev->bd_inode))
return -EINVAL;
truncate_inode_pages_range(mapping, start, start + len);
truncate_inode_pages_range(mapping, start, start + len - 1);
return blkdev_issue_discard(bdev, start >> 9, len >> 9,
GFP_KERNEL, flags);
}

1
block/kyber-iosched.c
View File

@ -833,6 +833,7 @@ static struct elevator_type kyber_sched = {
.limit_depth = kyber_limit_depth,
.prepare_request = kyber_prepare_request,
.finish_request = kyber_finish_request,
.requeue_request = kyber_finish_request,
.completed_request = kyber_completed_request,
.dispatch_request = kyber_dispatch_request,
.has_work = kyber_has_work,

16
block/mq-deadline.c
View File

@ -535,13 +535,22 @@ static void dd_insert_requests(struct blk_mq_hw_ctx *hctx,
spin_unlock(&dd->lock);
}
/*
* Nothing to do here. This is defined only to ensure that .finish_request
* method is called upon request completion.
*/
static void dd_prepare_request(struct request *rq, struct bio *bio)
{
}
/*
* For zoned block devices, write unlock the target zone of
* completed write requests. Do this while holding the zone lock
* spinlock so that the zone is never unlocked while deadline_fifo_request()
* while deadline_next_request() are executing.
* or deadline_next_request() are executing. This function is called for
* all requests, whether or not these requests complete successfully.
*/
static void dd_completed_request(struct request *rq)
static void dd_finish_request(struct request *rq)
{
struct request_queue *q = rq->q;
@ -756,7 +765,8 @@ static struct elevator_type mq_deadline = {
.ops.mq = {
.insert_requests = dd_insert_requests,
.dispatch_request = dd_dispatch_request,
.completed_request = dd_completed_request,
.prepare_request = dd_prepare_request,
.finish_request = dd_finish_request,
.next_request = elv_rb_latter_request,
.former_request = elv_rb_former_request,
.bio_merge = dd_bio_merge,

6
block/partition-generic.c
View File

@ -51,6 +51,12 @@ const char *bdevname(struct block_device *bdev, char *buf)
EXPORT_SYMBOL(bdevname);
const char *bio_devname(struct bio *bio, char *buf)
{
return disk_name(bio->bi_disk, bio->bi_partno, buf);
}
EXPORT_SYMBOL(bio_devname);
/*
* There's very little reason to use this, you should really
* have a struct block_device just about everywhere and use

2
drivers/block/amiflop.c
View File

@ -1758,7 +1758,7 @@ static struct kobject *floppy_find(dev_t dev, int *part, void *data)
if (unit[drive].type->code == FD_NODRIVE)
return NULL;
*part = 0;
return get_disk(unit[drive].gendisk);
return get_disk_and_module(unit[drive].gendisk);
}
static int __init amiga_floppy_probe(struct platform_device *pdev)

2
drivers/block/ataflop.c
View File

@ -1917,7 +1917,7 @@ static struct kobject *floppy_find(dev_t dev, int *part, void *data)
if (drive >= FD_MAX_UNITS || type > NUM_DISK_MINORS)
return NULL;
*part = 0;
return get_disk(unit[drive].disk);
return get_disk_and_module(unit[drive].disk);
}
static int __init atari_floppy_init (void)

2
drivers/block/brd.c
View File

@ -456,7 +456,7 @@ static struct kobject *brd_probe(dev_t dev, int *part, void *data)
mutex_lock(&brd_devices_mutex);
brd = brd_init_one(MINOR(dev) / max_part, &new);
kobj = brd ? get_disk(brd->brd_disk) : NULL;
kobj = brd ? get_disk_and_module(brd->brd_disk) : NULL;
mutex_unlock(&brd_devices_mutex);
if (new)

2
drivers/block/floppy.c
View File

@ -4505,7 +4505,7 @@ static struct kobject *floppy_find(dev_t dev, int *part, void *data)
if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
return NULL;
*part = 0;
return get_disk(disks[drive]);
return get_disk_and_module(disks[drive]);
}
static int __init do_floppy_init(void)

2
drivers/block/loop.c
View File

@ -1922,7 +1922,7 @@ static struct kobject *loop_probe(dev_t dev, int *part, void *data)
if (err < 0)
kobj = NULL;
else
kobj = get_disk(lo->lo_disk);
kobj = get_disk_and_module(lo->lo_disk);
mutex_unlock(&loop_index_mutex);
*part = 0;

2
drivers/block/nbd.c
View File

@ -1591,7 +1591,7 @@ static int nbd_genl_connect(struct sk_buff *skb, struct genl_info *info)
if (new_index < 0) {
mutex_unlock(&nbd_index_mutex);
printk(KERN_ERR "nbd: failed to add new device\n");
return ret;
return new_index;
}
nbd = idr_find(&nbd_index_idr, new_index);
}

2
drivers/block/pktcdvd.c
View File

@ -1122,7 +1122,7 @@ static int pkt_start_recovery(struct packet_data *pkt)
pkt->sector = new_sector;
bio_reset(pkt->bio);
bio_set_set(pkt->bio, pd->bdev);
bio_set_dev(pkt->bio, pd->bdev);
bio_set_op_attrs(pkt->bio, REQ_OP_WRITE, 0);
pkt->bio->bi_iter.bi_sector = new_sector;
pkt->bio->bi_iter.bi_size = pkt->frames * CD_FRAMESIZE;

2
drivers/block/swim.c
View File

@ -799,7 +799,7 @@ static struct kobject *floppy_find(dev_t dev, int *part, void *data)
return NULL;
*part = 0;
return get_disk(swd->unit[drive].disk);
return get_disk_and_module(swd->unit[drive].disk);
}
static int swim_add_floppy(struct swim_priv *swd, enum drive_location location)

2
drivers/block/z2ram.c
View File

@ -332,7 +332,7 @@ static const struct block_device_operations z2_fops =
static struct kobject *z2_find(dev_t dev, int *part, void *data)
{
*part = 0;
return get_disk(z2ram_gendisk);
return get_disk_and_module(z2ram_gendisk);
}
static struct request_queue *z2_queue;

2
drivers/ide/ide-probe.c
View File

@ -928,7 +928,7 @@ static int exact_lock(dev_t dev, void *data)
{
struct gendisk *p = data;
if (!get_disk(p))
if (!get_disk_and_module(p))
return -1;
return 0;
}

2
drivers/md/bcache/request.c
View File

@ -659,11 +659,11 @@ static void do_bio_hook(struct search *s, struct bio *orig_bio)
static void search_free(struct closure *cl)
{
struct search *s = container_of(cl, struct search, cl);
bio_complete(s);
if (s->iop.bio)
bio_put(s->iop.bio);
bio_complete(s);
closure_debug_destroy(cl);
mempool_free(s, s->d->c->search);
}

2
drivers/md/bcache/super.c
View File

@ -1274,7 +1274,7 @@ static int flash_devs_run(struct cache_set *c)
struct uuid_entry *u;
for (u = c->uuids;
u < c->uuids + c->devices_max_used && !ret;
u < c->uuids + c->nr_uuids && !ret;
u++)
if (UUID_FLASH_ONLY(u))
ret = flash_dev_run(c, u);

12
drivers/nvme/host/core.c
View File

@ -2844,7 +2844,7 @@ static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl,
}
static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
struct nvme_id_ns *id, bool *new)
struct nvme_id_ns *id)
{
struct nvme_ctrl *ctrl = ns->ctrl;
bool is_shared = id->nmic & (1 << 0);
@ -2860,8 +2860,6 @@ static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
ret = PTR_ERR(head);
goto out_unlock;
}
*new = true;
} else {
struct nvme_ns_ids ids;
@ -2873,8 +2871,6 @@ static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
ret = -EINVAL;
goto out_unlock;
}
*new = false;
}
list_add_tail(&ns->siblings, &head->list);
@ -2945,7 +2941,6 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
struct nvme_id_ns *id;
char disk_name[DISK_NAME_LEN];
int node = dev_to_node(ctrl->dev), flags = GENHD_FL_EXT_DEVT;
bool new = true;
ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
if (!ns)
@ -2971,7 +2966,7 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
if (id->ncap == 0)
goto out_free_id;
if (nvme_init_ns_head(ns, nsid, id, &new))
if (nvme_init_ns_head(ns, nsid, id))
goto out_free_id;
nvme_setup_streams_ns(ctrl, ns);
@ -3037,8 +3032,7 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
pr_warn("%s: failed to register lightnvm sysfs group for identification\n",
ns->disk->disk_name);
if (new)
nvme_mpath_add_disk(ns->head);
nvme_mpath_add_disk(ns->head);
nvme_mpath_add_disk_links(ns);
return;
out_unlink_ns:

2
drivers/nvme/host/fabrics.c
View File

@ -493,7 +493,7 @@ EXPORT_SYMBOL_GPL(nvmf_should_reconnect);
*/
int nvmf_register_transport(struct nvmf_transport_ops *ops)
{
if (!ops->create_ctrl || !ops->module)
if (!ops->create_ctrl)
return -EINVAL;
down_write(&nvmf_transports_rwsem);

15
drivers/nvme/host/multipath.c
View File

@ -198,11 +198,16 @@ void nvme_mpath_add_disk(struct nvme_ns_head *head)
{
if (!head->disk)
return;
device_add_disk(&head->subsys->dev, head->disk);
if (sysfs_create_group(&disk_to_dev(head->disk)->kobj,
&nvme_ns_id_attr_group))
pr_warn("%s: failed to create sysfs group for identification\n",
head->disk->disk_name);
mutex_lock(&head->subsys->lock);
if (!(head->disk->flags & GENHD_FL_UP)) {
device_add_disk(&head->subsys->dev, head->disk);
if (sysfs_create_group(&disk_to_dev(head->disk)->kobj,
&nvme_ns_id_attr_group))
pr_warn("%s: failed to create sysfs group for identification\n",
head->disk->disk_name);
}
mutex_unlock(&head->subsys->lock);
}
void nvme_mpath_add_disk_links(struct nvme_ns *ns)

5
drivers/nvme/host/pci.c
View File

@ -1459,7 +1459,7 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid)
nvmeq->cq_vector = qid - 1;
result = adapter_alloc_cq(dev, qid, nvmeq);
if (result < 0)
return result;
goto release_vector;
result = adapter_alloc_sq(dev, qid, nvmeq);
if (result < 0)
@ -1473,9 +1473,12 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid)
return result;
release_sq:
dev->online_queues--;
adapter_delete_sq(dev, qid);
release_cq:
adapter_delete_cq(dev, qid);
release_vector:
nvmeq->cq_vector = -1;
return result;
}

4
drivers/nvme/host/rdma.c
View File

@ -1051,7 +1051,7 @@ static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue,
struct nvme_rdma_device *dev = queue->device;
struct ib_device *ibdev = dev->dev;
if (!blk_rq_bytes(rq))
if (!blk_rq_payload_bytes(rq))
return;
if (req->mr) {
@ -1166,7 +1166,7 @@ static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,
c->common.flags |= NVME_CMD_SGL_METABUF;
if (!blk_rq_bytes(rq))
if (!blk_rq_payload_bytes(rq))
return nvme_rdma_set_sg_null(c);
req->sg_table.sgl = req->first_sgl;

9
drivers/nvme/target/core.c
View File

@ -520,9 +520,12 @@ bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
goto fail;
}
/* either variant of SGLs is fine, as we don't support metadata */
if (unlikely((flags & NVME_CMD_SGL_ALL) != NVME_CMD_SGL_METABUF &&
(flags & NVME_CMD_SGL_ALL) != NVME_CMD_SGL_METASEG)) {
/*
* For fabrics, PSDT field shall describe metadata pointer (MPTR) that
* contains an address of a single contiguous physical buffer that is
* byte aligned.
*/
if (unlikely((flags & NVME_CMD_SGL_ALL) != NVME_CMD_SGL_METABUF)) {
status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
goto fail;
}

4
drivers/nvme/target/loop.c
View File

@ -184,7 +184,7 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
return BLK_STS_OK;
}
if (blk_rq_bytes(req)) {
if (blk_rq_payload_bytes(req)) {
iod->sg_table.sgl = iod->first_sgl;
if (sg_alloc_table_chained(&iod->sg_table,
blk_rq_nr_phys_segments(req),
@ -193,7 +193,7 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
iod->req.sg = iod->sg_table.sgl;
iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl);
iod->req.transfer_len = blk_rq_bytes(req);
iod->req.transfer_len = blk_rq_payload_bytes(req);
}
blk_mq_start_request(req);

49
fs/block_dev.c
View File

@ -1058,6 +1058,27 @@ static int bd_prepare_to_claim(struct block_device *bdev,
return 0;
}
static struct gendisk *bdev_get_gendisk(struct block_device *bdev, int *partno)
{
struct gendisk *disk = get_gendisk(bdev->bd_dev, partno);
if (!disk)
return NULL;
/*
* Now that we hold gendisk reference we make sure bdev we looked up is
* not stale. If it is, it means device got removed and created before
* we looked up gendisk and we fail open in such case. Associating
* unhashed bdev with newly created gendisk could lead to two bdevs
* (and thus two independent caches) being associated with one device
* which is bad.
*/
if (inode_unhashed(bdev->bd_inode)) {
put_disk_and_module(disk);
return NULL;
}
return disk;
}
/**
* bd_start_claiming - start claiming a block device
* @bdev: block device of interest
@ -1094,7 +1115,7 @@ static struct block_device *bd_start_claiming(struct block_device *bdev,
* @bdev might not have been initialized properly yet, look up
* and grab the outer block device the hard way.
*/
disk = get_gendisk(bdev->bd_dev, &partno);
disk = bdev_get_gendisk(bdev, &partno);
if (!disk)
return ERR_PTR(-ENXIO);
@ -1111,8 +1132,7 @@ static struct block_device *bd_start_claiming(struct block_device *bdev,
else
whole = bdgrab(bdev);
module_put(disk->fops->owner);
put_disk(disk);
put_disk_and_module(disk);
if (!whole)
return ERR_PTR(-ENOMEM);
@ -1407,10 +1427,10 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part);
static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
{
struct gendisk *disk;
struct module *owner;
int ret;
int partno;
int perm = 0;
bool first_open = false;
if (mode & FMODE_READ)
perm |= MAY_READ;
@ -1430,14 +1450,14 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
restart:
ret = -ENXIO;
disk = get_gendisk(bdev->bd_dev, &partno);
disk = bdev_get_gendisk(bdev, &partno);
if (!disk)
goto out;
owner = disk->fops->owner;
disk_block_events(disk);
mutex_lock_nested(&bdev->bd_mutex, for_part);
if (!bdev->bd_openers) {
first_open = true;
bdev->bd_disk = disk;
bdev->bd_queue = disk->queue;
bdev->bd_contains = bdev;
@ -1463,8 +1483,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
bdev->bd_queue = NULL;
mutex_unlock(&bdev->bd_mutex);
disk_unblock_events(disk);
put_disk(disk);
module_put(owner);
put_disk_and_module(disk);
goto restart;
}
}
@ -1524,15 +1543,15 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
if (ret)
goto out_unlock_bdev;
}
/* only one opener holds refs to the module and disk */
put_disk(disk);
module_put(owner);
}
bdev->bd_openers++;
if (for_part)
bdev->bd_part_count++;
mutex_unlock(&bdev->bd_mutex);
disk_unblock_events(disk);
/* only one opener holds refs to the module and disk */
if (!first_open)
put_disk_and_module(disk);
return 0;
out_clear:
@ -1546,8 +1565,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
out_unlock_bdev:
mutex_unlock(&bdev->bd_mutex);
disk_unblock_events(disk);
put_disk(disk);
module_put(owner);
put_disk_and_module(disk);
out:
bdput(bdev);
@ -1770,8 +1788,6 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
disk->fops->release(disk, mode);
}
if (!bdev->bd_openers) {
struct module *owner = disk->fops->owner;
disk_put_part(bdev->bd_part);
bdev->bd_part = NULL;
bdev->bd_disk = NULL;
@ -1779,8 +1795,7 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
victim = bdev->bd_contains;
bdev->bd_contains = NULL;
put_disk(disk);
module_put(owner);
put_disk_and_module(disk);
}
mutex_unlock(&bdev->bd_mutex);
bdput(bdev);

3
fs/direct-io.c
View File

@ -1274,8 +1274,7 @@ do_blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
*/
if (dio->is_async && iov_iter_rw(iter) == WRITE) {
retval = 0;
if ((iocb->ki_filp->f_flags & O_DSYNC) ||
IS_SYNC(iocb->ki_filp->f_mapping->host))
if (iocb->ki_flags & IOCB_DSYNC)
retval = dio_set_defer_completion(dio);
else if (!dio->inode->i_sb->s_dio_done_wq) {
/*

4
include/linux/bio.h
View File

@ -511,6 +511,7 @@ void zero_fill_bio(struct bio *bio);
extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *);
extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int);
extern unsigned int bvec_nr_vecs(unsigned short idx);
extern const char *bio_devname(struct bio *bio, char *buffer);
#define bio_set_dev(bio, bdev) \
do { \
@ -529,9 +530,6 @@ do { \
#define bio_dev(bio) \
disk_devt((bio)->bi_disk)
#define bio_devname(bio, buf) \
__bdevname(bio_dev(bio), (buf))
#ifdef CONFIG_BLK_CGROUP
int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css);
void bio_disassociate_task(struct bio *bio);

4
include/linux/genhd.h
View File

@ -198,6 +198,7 @@ struct gendisk {
void *private_data;
int flags;
struct rw_semaphore lookup_sem;
struct kobject *slave_dir;
struct timer_rand_state *random;
@ -600,8 +601,9 @@ extern void delete_partition(struct gendisk *, int);
extern void printk_all_partitions(void);
extern struct gendisk *__alloc_disk_node(int minors, int node_id);
extern struct kobject *get_disk(struct gendisk *disk);
extern struct kobject *get_disk_and_module(struct gendisk *disk);
extern void put_disk(struct gendisk *disk);
extern void put_disk_and_module(struct gendisk *disk);
extern void blk_register_region(dev_t devt, unsigned long range,
struct module *module,
struct kobject *(*probe)(dev_t, int *, void *),

2
include/uapi/linux/blktrace_api.h
View File

@ -131,7 +131,7 @@ enum {
#define BLKTRACE_BDEV_SIZE 32
/*
* User setup structure passed with BLKTRACESTART
* User setup structure passed with BLKTRACESETUP
*/
struct blk_user_trace_setup {
char name[BLKTRACE_BDEV_SIZE]; /* output */