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Merge remote-tracking branch 'jens/for-4.2/core' into dm-4.2

Browse source
This commit is contained in:
Mike Snitzer 2015-05-29 14:17:16 -04:00
commit 183f7802e7
54 changed files with 573 additions and 709 deletions
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4
block/bio-integrity.c
View file

@ -361,7 +361,7 @@ static void bio_integrity_verify_fn(struct work_struct *work)
/* Restore original bio completion handler */
bio->bi_end_io = bip->bip_end_io;
bio_endio_nodec(bio, error);
bio_endio(bio, error);
}
/**
@ -388,7 +388,7 @@ void bio_integrity_endio(struct bio *bio, int error)
*/
if (error) {
bio->bi_end_io = bip->bip_end_io;
bio_endio_nodec(bio, error);
bio_endio(bio, error);
return;
}

77
block/bio.c
View file

@ -270,8 +270,8 @@ void bio_init(struct bio *bio)
{
memset(bio, 0, sizeof(*bio));
bio->bi_flags = 1 << BIO_UPTODATE;
atomic_set(&bio->bi_remaining, 1);
atomic_set(&bio->bi_cnt, 1);
atomic_set(&bio->__bi_remaining, 1);
atomic_set(&bio->__bi_cnt, 1);
}
EXPORT_SYMBOL(bio_init);
@ -292,8 +292,8 @@ void bio_reset(struct bio *bio)
__bio_free(bio);
memset(bio, 0, BIO_RESET_BYTES);
bio->bi_flags = flags|(1 << BIO_UPTODATE);
atomic_set(&bio->bi_remaining, 1);
bio->bi_flags = flags | (1 << BIO_UPTODATE);
atomic_set(&bio->__bi_remaining, 1);
}
EXPORT_SYMBOL(bio_reset);
@ -303,6 +303,17 @@ static void bio_chain_endio(struct bio *bio, int error)
bio_put(bio);
}
/*
* Increment chain count for the bio. Make sure the CHAIN flag update
* is visible before the raised count.
*/
static inline void bio_inc_remaining(struct bio *bio)
{
bio->bi_flags |= (1 << BIO_CHAIN);
smp_mb__before_atomic();
atomic_inc(&bio->__bi_remaining);
}
/**
* bio_chain - chain bio completions
* @bio: the target bio
@ -320,7 +331,7 @@ void bio_chain(struct bio *bio, struct bio *parent)
bio->bi_private = parent;
bio->bi_end_io = bio_chain_endio;
atomic_inc(&parent->bi_remaining);
bio_inc_remaining(parent);
}
EXPORT_SYMBOL(bio_chain);
@ -524,13 +535,17 @@ EXPORT_SYMBOL(zero_fill_bio);
**/
void bio_put(struct bio *bio)
{
BIO_BUG_ON(!atomic_read(&bio->bi_cnt));
/*
* last put frees it
*/
if (atomic_dec_and_test(&bio->bi_cnt))
if (!bio_flagged(bio, BIO_REFFED))
bio_free(bio);
else {
BIO_BUG_ON(!atomic_read(&bio->__bi_cnt));
/*
* last put frees it
*/
if (atomic_dec_and_test(&bio->__bi_cnt))
bio_free(bio);
}
}
EXPORT_SYMBOL(bio_put);
@ -1741,6 +1756,25 @@ void bio_flush_dcache_pages(struct bio *bi)
EXPORT_SYMBOL(bio_flush_dcache_pages);
#endif
static inline bool bio_remaining_done(struct bio *bio)
{
/*
* If we're not chaining, then ->__bi_remaining is always 1 and
* we always end io on the first invocation.
*/
if (!bio_flagged(bio, BIO_CHAIN))
return true;
BUG_ON(atomic_read(&bio->__bi_remaining) <= 0);
if (atomic_dec_and_test(&bio->__bi_remaining)) {
clear_bit(BIO_CHAIN, &bio->bi_flags);
return true;
}
return false;
}
/**
* bio_endio - end I/O on a bio
* @bio: bio
@ -1758,15 +1792,13 @@ EXPORT_SYMBOL(bio_flush_dcache_pages);
void bio_endio(struct bio *bio, int error)
{
while (bio) {
BUG_ON(atomic_read(&bio->bi_remaining) <= 0);
if (error)
clear_bit(BIO_UPTODATE, &bio->bi_flags);
else if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
error = -EIO;
if (!atomic_dec_and_test(&bio->bi_remaining))
return;
if (unlikely(!bio_remaining_done(bio)))
break;
/*
* Need to have a real endio function for chained bios,
@ -1789,21 +1821,6 @@ void bio_endio(struct bio *bio, int error)
}
EXPORT_SYMBOL(bio_endio);
/**
* bio_endio_nodec - end I/O on a bio, without decrementing bi_remaining
* @bio: bio
* @error: error, if any
*
* For code that has saved and restored bi_end_io; thing hard before using this
* function, probably you should've cloned the entire bio.
**/
void bio_endio_nodec(struct bio *bio, int error)
{
atomic_inc(&bio->bi_remaining);
bio_endio(bio, error);
}
EXPORT_SYMBOL(bio_endio_nodec);
/**
* bio_split - split a bio
* @bio: bio to split

136
block/blk-core.c
View file

@ -117,7 +117,7 @@ EXPORT_SYMBOL(blk_rq_init);
static void req_bio_endio(struct request *rq, struct bio *bio,
unsigned int nbytes, int error)
{
if (error)
if (error && !(rq->cmd_flags & REQ_CLONE))
clear_bit(BIO_UPTODATE, &bio->bi_flags);
else if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
error = -EIO;
@ -128,7 +128,8 @@ static void req_bio_endio(struct request *rq, struct bio *bio,
bio_advance(bio, nbytes);
/* don't actually finish bio if it's part of flush sequence */
if (bio->bi_iter.bi_size == 0 && !(rq->cmd_flags & REQ_FLUSH_SEQ))
if (bio->bi_iter.bi_size == 0 &&
!(rq->cmd_flags & (REQ_FLUSH_SEQ|REQ_CLONE)))
bio_endio(bio, error);
}
@ -285,6 +286,7 @@ inline void __blk_run_queue_uncond(struct request_queue *q)
q->request_fn(q);
q->request_fn_active--;
}
EXPORT_SYMBOL_GPL(__blk_run_queue_uncond);
/**
* __blk_run_queue - run a single device queue
@ -1525,7 +1527,8 @@ bool bio_attempt_front_merge(struct request_queue *q, struct request *req,
* Caller must ensure !blk_queue_nomerges(q) beforehand.
*/
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
unsigned int *request_count)
unsigned int *request_count,
struct request **same_queue_rq)
{
struct blk_plug *plug;
struct request *rq;
@ -1545,8 +1548,16 @@ bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
list_for_each_entry_reverse(rq, plug_list, queuelist) {
int el_ret;
if (rq->q == q)
if (rq->q == q) {
(*request_count)++;
/*
* Only blk-mq multiple hardware queues case checks the
* rq in the same queue, there should be only one such
* rq in a queue
**/
if (same_queue_rq)
*same_queue_rq = rq;
}
if (rq->q != q || !blk_rq_merge_ok(rq, bio))
continue;
@ -1611,7 +1622,7 @@ static void blk_queue_bio(struct request_queue *q, struct bio *bio)
* any locks.
*/
if (!blk_queue_nomerges(q) &&
blk_attempt_plug_merge(q, bio, &request_count))
blk_attempt_plug_merge(q, bio, &request_count, NULL))
return;
spin_lock_irq(q->queue_lock);
@ -1718,8 +1729,6 @@ static void handle_bad_sector(struct bio *bio)
bio->bi_rw,
(unsigned long long)bio_end_sector(bio),
(long long)(i_size_read(bio->bi_bdev->bd_inode) >> 9));
set_bit(BIO_EOF, &bio->bi_flags);
}
#ifdef CONFIG_FAIL_MAKE_REQUEST
@ -2904,95 +2913,22 @@ int blk_lld_busy(struct request_queue *q)
}
EXPORT_SYMBOL_GPL(blk_lld_busy);
/**
* blk_rq_unprep_clone - Helper function to free all bios in a cloned request
* @rq: the clone request to be cleaned up
*
* Description:
* Free all bios in @rq for a cloned request.
*/
void blk_rq_unprep_clone(struct request *rq)
{
struct bio *bio;
while ((bio = rq->bio) != NULL) {
rq->bio = bio->bi_next;
bio_put(bio);
}
}
EXPORT_SYMBOL_GPL(blk_rq_unprep_clone);
/*
* Copy attributes of the original request to the clone request.
* The actual data parts (e.g. ->cmd, ->sense) are not copied.
*/
static void __blk_rq_prep_clone(struct request *dst, struct request *src)
void blk_rq_prep_clone(struct request *dst, struct request *src)
{
dst->cpu = src->cpu;
dst->cmd_flags |= (src->cmd_flags & REQ_CLONE_MASK) | REQ_NOMERGE;
dst->cmd_flags |= (src->cmd_flags & REQ_CLONE_MASK);
dst->cmd_flags |= REQ_NOMERGE | REQ_CLONE;
dst->cmd_type = src->cmd_type;
dst->__sector = blk_rq_pos(src);
dst->__data_len = blk_rq_bytes(src);
dst->nr_phys_segments = src->nr_phys_segments;
dst->ioprio = src->ioprio;
dst->extra_len = src->extra_len;
}
/**
* blk_rq_prep_clone - Helper function to setup clone request
* @rq: the request to be setup
* @rq_src: original request to be cloned
* @bs: bio_set that bios for clone are allocated from
* @gfp_mask: memory allocation mask for bio
* @bio_ctr: setup function to be called for each clone bio.
* Returns %0 for success, non %0 for failure.
* @data: private data to be passed to @bio_ctr
*
* Description:
* Clones bios in @rq_src to @rq, and copies attributes of @rq_src to @rq.
* The actual data parts of @rq_src (e.g. ->cmd, ->sense)
* are not copied, and copying such parts is the caller's responsibility.
* Also, pages which the original bios are pointing to are not copied
* and the cloned bios just point same pages.
* So cloned bios must be completed before original bios, which means
* the caller must complete @rq before @rq_src.
*/
int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
struct bio_set *bs, gfp_t gfp_mask,
int (*bio_ctr)(struct bio *, struct bio *, void *),
void *data)
{
struct bio *bio, *bio_src;
if (!bs)
bs = fs_bio_set;
__rq_for_each_bio(bio_src, rq_src) {
bio = bio_clone_fast(bio_src, gfp_mask, bs);
if (!bio)
goto free_and_out;
if (bio_ctr && bio_ctr(bio, bio_src, data))
goto free_and_out;
if (rq->bio) {
rq->biotail->bi_next = bio;
rq->biotail = bio;
} else
rq->bio = rq->biotail = bio;
}
__blk_rq_prep_clone(rq, rq_src);
return 0;
free_and_out:
if (bio)
bio_put(bio);
blk_rq_unprep_clone(rq);
return -ENOMEM;
dst->bio = src->bio;
dst->biotail = src->biotail;
dst->cmd = src->cmd;
dst->cmd_len = src->cmd_len;
dst->sense = src->sense;
}
EXPORT_SYMBOL_GPL(blk_rq_prep_clone);
@ -3034,21 +2970,20 @@ void blk_start_plug(struct blk_plug *plug)
{
struct task_struct *tsk = current;
/*
* If this is a nested plug, don't actually assign it.
*/
if (tsk->plug)
return;
INIT_LIST_HEAD(&plug->list);
INIT_LIST_HEAD(&plug->mq_list);
INIT_LIST_HEAD(&plug->cb_list);
/*
* If this is a nested plug, don't actually assign it. It will be
* flushed on its own.
* Store ordering should not be needed here, since a potential
* preempt will imply a full memory barrier
*/
if (!tsk->plug) {
/*
* Store ordering should not be needed here, since a potential
* preempt will imply a full memory barrier
*/
tsk->plug = plug;
}
tsk->plug = plug;
}
EXPORT_SYMBOL(blk_start_plug);
@ -3195,10 +3130,11 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
void blk_finish_plug(struct blk_plug *plug)
{
if (plug != current->plug)
return;
blk_flush_plug_list(plug, false);
if (plug == current->plug)
current->plug = NULL;
current->plug = NULL;
}
EXPORT_SYMBOL(blk_finish_plug);

10
block/blk-exec.c
View file

@ -53,7 +53,6 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
rq_end_io_fn *done)
{
int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK;
bool is_pm_resume;
WARN_ON(irqs_disabled());
WARN_ON(rq->cmd_type == REQ_TYPE_FS);
@ -70,12 +69,6 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
return;
}
/*
* need to check this before __blk_run_queue(), because rq can
* be freed before that returns.
*/
is_pm_resume = rq->cmd_type == REQ_TYPE_PM_RESUME;
spin_lock_irq(q->queue_lock);
if (unlikely(blk_queue_dying(q))) {
@ -88,9 +81,6 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
__elv_add_request(q, rq, where);
__blk_run_queue(q);
/* the queue is stopped so it won't be run */
if (is_pm_resume)
__blk_run_queue_uncond(q);
spin_unlock_irq(q->queue_lock);
}
EXPORT_SYMBOL_GPL(blk_execute_rq_nowait);

148
block/blk-mq.c
View file

@ -89,7 +89,8 @@ static int blk_mq_queue_enter(struct request_queue *q, gfp_t gfp)
return -EBUSY;
ret = wait_event_interruptible(q->mq_freeze_wq,
!q->mq_freeze_depth || blk_queue_dying(q));
!atomic_read(&q->mq_freeze_depth) ||
blk_queue_dying(q));
if (blk_queue_dying(q))
return -ENODEV;
if (ret)
@ -112,13 +113,10 @@ static void blk_mq_usage_counter_release(struct percpu_ref *ref)
void blk_mq_freeze_queue_start(struct request_queue *q)
{
bool freeze;
int freeze_depth;
spin_lock_irq(q->queue_lock);
freeze = !q->mq_freeze_depth++;
spin_unlock_irq(q->queue_lock);
if (freeze) {
freeze_depth = atomic_inc_return(&q->mq_freeze_depth);
if (freeze_depth == 1) {
percpu_ref_kill(&q->mq_usage_counter);
blk_mq_run_hw_queues(q, false);
}
@ -143,13 +141,11 @@ EXPORT_SYMBOL_GPL(blk_mq_freeze_queue);
void blk_mq_unfreeze_queue(struct request_queue *q)
{
bool wake;
int freeze_depth;
spin_lock_irq(q->queue_lock);
wake = !--q->mq_freeze_depth;
WARN_ON_ONCE(q->mq_freeze_depth < 0);
spin_unlock_irq(q->queue_lock);
if (wake) {
freeze_depth = atomic_dec_return(&q->mq_freeze_depth);
WARN_ON_ONCE(freeze_depth < 0);
if (!freeze_depth) {
percpu_ref_reinit(&q->mq_usage_counter);
wake_up_all(&q->mq_freeze_wq);
}
@ -1237,6 +1233,38 @@ static struct request *blk_mq_map_request(struct request_queue *q,
return rq;
}
static int blk_mq_direct_issue_request(struct request *rq)
{
int ret;
struct request_queue *q = rq->q;
struct blk_mq_hw_ctx *hctx = q->mq_ops->map_queue(q,
rq->mq_ctx->cpu);
struct blk_mq_queue_data bd = {
.rq = rq,
.list = NULL,
.last = 1
};
/*
* For OK queue, we are done. For error, kill it. Any other
* error (busy), just add it to our list as we previously
* would have done
*/
ret = q->mq_ops->queue_rq(hctx, &bd);
if (ret == BLK_MQ_RQ_QUEUE_OK)
return 0;
else {
__blk_mq_requeue_request(rq);
if (ret == BLK_MQ_RQ_QUEUE_ERROR) {
rq->errors = -EIO;
blk_mq_end_request(rq, rq->errors);
return 0;
}
return -1;
}
}
/*
* Multiple hardware queue variant. This will not use per-process plugs,
* but will attempt to bypass the hctx queueing if we can go straight to
@ -1248,6 +1276,9 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
const int is_flush_fua = bio->bi_rw & (REQ_FLUSH | REQ_FUA);
struct blk_map_ctx data;
struct request *rq;
unsigned int request_count = 0;
struct blk_plug *plug;
struct request *same_queue_rq = NULL;
blk_queue_bounce(q, &bio);
@ -1256,6 +1287,10 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
return;
}
if (!is_flush_fua && !blk_queue_nomerges(q) &&
blk_attempt_plug_merge(q, bio, &request_count, &same_queue_rq))
return;
rq = blk_mq_map_request(q, bio, &data);
if (unlikely(!rq))
return;
@ -1266,38 +1301,42 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
goto run_queue;
}
plug = current->plug;
/*
* If the driver supports defer issued based on 'last', then
* queue it up like normal since we can potentially save some
* CPU this way.
*/
if (is_sync && !(data.hctx->flags & BLK_MQ_F_DEFER_ISSUE)) {
struct blk_mq_queue_data bd = {
.rq = rq,
.list = NULL,
.last = 1
};
int ret;
if (((plug && !blk_queue_nomerges(q)) || is_sync) &&
!(data.hctx->flags & BLK_MQ_F_DEFER_ISSUE)) {
struct request *old_rq = NULL;
blk_mq_bio_to_request(rq, bio);
/*
* For OK queue, we are done. For error, kill it. Any other
* error (busy), just add it to our list as we previously
* would have done
* we do limited pluging. If bio can be merged, do merge.
* Otherwise the existing request in the plug list will be
* issued. So the plug list will have one request at most
*/
ret = q->mq_ops->queue_rq(data.hctx, &bd);
if (ret == BLK_MQ_RQ_QUEUE_OK)
goto done;
else {
__blk_mq_requeue_request(rq);
if (ret == BLK_MQ_RQ_QUEUE_ERROR) {
rq->errors = -EIO;
blk_mq_end_request(rq, rq->errors);
goto done;
if (plug) {
/*
* The plug list might get flushed before this. If that
* happens, same_queue_rq is invalid and plug list is empty
**/
if (same_queue_rq && !list_empty(&plug->mq_list)) {
old_rq = same_queue_rq;
list_del_init(&old_rq->queuelist);
}
}
list_add_tail(&rq->queuelist, &plug->mq_list);
} else /* is_sync */
old_rq = rq;
blk_mq_put_ctx(data.ctx);
if (!old_rq)
return;
if (!blk_mq_direct_issue_request(old_rq))
return;
blk_mq_insert_request(old_rq, false, true, true);
return;
}
if (!blk_mq_merge_queue_io(data.hctx, data.ctx, rq, bio)) {
@ -1310,7 +1349,6 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
run_queue:
blk_mq_run_hw_queue(data.hctx, !is_sync || is_flush_fua);
}
done:
blk_mq_put_ctx(data.ctx);
}
@ -1322,16 +1360,11 @@ static void blk_sq_make_request(struct request_queue *q, struct bio *bio)
{
const int is_sync = rw_is_sync(bio->bi_rw);
const int is_flush_fua = bio->bi_rw & (REQ_FLUSH | REQ_FUA);
unsigned int use_plug, request_count = 0;
struct blk_plug *plug;
unsigned int request_count = 0;
struct blk_map_ctx data;
struct request *rq;
/*
* If we have multiple hardware queues, just go directly to
* one of those for sync IO.
*/
use_plug = !is_flush_fua && !is_sync;
blk_queue_bounce(q, &bio);
if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) {
@ -1339,8 +1372,8 @@ static void blk_sq_make_request(struct request_queue *q, struct bio *bio)
return;
}
if (use_plug && !blk_queue_nomerges(q) &&
blk_attempt_plug_merge(q, bio, &request_count))
if (!is_flush_fua && !blk_queue_nomerges(q) &&
blk_attempt_plug_merge(q, bio, &request_count, NULL))
return;
rq = blk_mq_map_request(q, bio, &data);
@ -1358,21 +1391,18 @@ static void blk_sq_make_request(struct request_queue *q, struct bio *bio)
* utilize that to temporarily store requests until the task is
* either done or scheduled away.
*/
if (use_plug) {
struct blk_plug *plug = current->plug;
if (plug) {
blk_mq_bio_to_request(rq, bio);
if (list_empty(&plug->mq_list))
trace_block_plug(q);
else if (request_count >= BLK_MAX_REQUEST_COUNT) {
blk_flush_plug_list(plug, false);
trace_block_plug(q);
}
list_add_tail(&rq->queuelist, &plug->mq_list);
blk_mq_put_ctx(data.ctx);
return;
plug = current->plug;
if (plug) {
blk_mq_bio_to_request(rq, bio);
if (list_empty(&plug->mq_list))
trace_block_plug(q);
else if (request_count >= BLK_MAX_REQUEST_COUNT) {
blk_flush_plug_list(plug, false);
trace_block_plug(q);
}
list_add_tail(&rq->queuelist, &plug->mq_list);
blk_mq_put_ctx(data.ctx);
return;
}
if (!blk_mq_merge_queue_io(data.hctx, data.ctx, rq, bio)) {
@ -2052,7 +2082,7 @@ void blk_mq_free_queue(struct request_queue *q)
/* Basically redo blk_mq_init_queue with queue frozen */
static void blk_mq_queue_reinit(struct request_queue *q)
{
WARN_ON_ONCE(!q->mq_freeze_depth);
WARN_ON_ONCE(!atomic_read(&q->mq_freeze_depth));
blk_mq_sysfs_unregister(q);

5
block/blk.h
View file

@ -78,7 +78,8 @@ bool bio_attempt_front_merge(struct request_queue *q, struct request *req,
bool bio_attempt_back_merge(struct request_queue *q, struct request *req,
struct bio *bio);
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
unsigned int *request_count);
unsigned int *request_count,
struct request **same_queue_rq);
void blk_account_io_start(struct request *req, bool new_io);
void blk_account_io_completion(struct request *req, unsigned int bytes);
@ -193,8 +194,6 @@ int blk_try_merge(struct request *rq, struct bio *bio);
void blk_queue_congestion_threshold(struct request_queue *q);
void __blk_run_queue_uncond(struct request_queue *q);
int blk_dev_init(void);

3
block/bounce.c
View file

@ -128,9 +128,6 @@ static void bounce_end_io(struct bio *bio, mempool_t *pool, int err)
struct bio_vec *bvec, *org_vec;
int i;
if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags))
set_bit(BIO_EOPNOTSUPP, &bio_orig->bi_flags);
/*
* free up bounce indirect pages used
*/

37
block/ioctl.c
View file

@ -150,21 +150,48 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
}
}
static int blkdev_reread_part(struct block_device *bdev)
/*
* This is an exported API for the block driver, and will not
* acquire bd_mutex. This API should be used in case that
* caller has held bd_mutex already.
*/
int __blkdev_reread_part(struct block_device *bdev)
{
struct gendisk *disk = bdev->bd_disk;
int res;
if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!mutex_trylock(&bdev->bd_mutex))
return -EBUSY;
res = rescan_partitions(disk, bdev);
lockdep_assert_held(&bdev->bd_mutex);
return rescan_partitions(disk, bdev);
}
EXPORT_SYMBOL(__blkdev_reread_part);
/*
* This is an exported API for the block driver, and will
* try to acquire bd_mutex. If bd_mutex has been held already
* in current context, please call __blkdev_reread_part().
*
* Make sure the held locks in current context aren't required
* in open()/close() handler and I/O path for avoiding ABBA deadlock:
* - bd_mutex is held before calling block driver's open/close
* handler
* - reading partition table may submit I/O to the block device
*/
int blkdev_reread_part(struct block_device *bdev)
{
int res;
mutex_lock(&bdev->bd_mutex);
res = __blkdev_reread_part(bdev);
mutex_unlock(&bdev->bd_mutex);
return res;
}
EXPORT_SYMBOL(blkdev_reread_part);
static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
uint64_t len, int secure)