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for-linus-20190726 

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Merge tag 'for-linus-20190726' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:

 - Several io_uring fixes/improvements:
     - Blocking fix for O_DIRECT (me)
     - Latter page slowness for registered buffers (me)
     - Fix poll hang under certain conditions (me)
     - Defer sequence check fix for wrapped rings (Zhengyuan)
     - Mismatch in async inc/dec accounting (Zhengyuan)
     - Memory ordering issue that could cause stall (Zhengyuan)
      - Track sequential defer in bytes, not pages (Zhengyuan)

 - NVMe pull request from Christoph

 - Set of hang fixes for wbt (Josef)

 - Redundant error message kill for libahci (Ding)

 - Remove unused blk_mq_sched_started_request() and related ops (Marcos)

 - drbd dynamic alloc shash descriptor to reduce stack use (Arnd)

 - blkcg ->pd_stat() non-debug print (Tejun)

 - bcache memory leak fix (Wei)

 - Comment fix (Akinobu)

 - BFQ perf regression fix (Paolo)

* tag 'for-linus-20190726' of git://git.kernel.dk/linux-block: (24 commits)
  io_uring: ensure ->list is initialized for poll commands
  Revert "nvme-pci: don't create a read hctx mapping without read queues"
  nvme: fix multipath crash when ANA is deactivated
  nvme: fix memory leak caused by incorrect subsystem free
  nvme: ignore subnqn for ADATA SX6000LNP
  drbd: dynamically allocate shash descriptor
  block: blk-mq: Remove blk_mq_sched_started_request and started_request
  bcache: fix possible memory leak in bch_cached_dev_run()
  io_uring: track io length in async_list based on bytes
  io_uring: don't use iov_iter_advance() for fixed buffers
  block: properly handle IOCB_NOWAIT for async O_DIRECT IO
  blk-mq: allow REQ_NOWAIT to return an error inline
  io_uring: add a memory barrier before atomic_read
  rq-qos: use a mb for got_token
  rq-qos: set ourself TASK_UNINTERRUPTIBLE after we schedule
  rq-qos: don't reset has_sleepers on spurious wakeups
  rq-qos: fix missed wake-ups in rq_qos_throttle
  wait: add wq_has_single_sleeper helper
  block, bfq: check also in-flight I/O in dispatch plugging
  block: fix sysfs module parameters directory path in comment
  ...
This commit is contained in:
Linus Torvalds 2019-07-26 10:32:12 -07:00
parent 750c930b08 9c0b2596f2
commit 0441281965
20 changed files with 224 additions and 92 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
block/bfq-iosched.c
View File

@ -3354,38 +3354,57 @@ static void bfq_dispatch_remove(struct request_queue *q, struct request *rq)
* there is no active group, then the primary expectation for
* this device is probably a high throughput.
*
* We are now left only with explaining the additional
* compound condition that is checked below for deciding
* whether the scenario is asymmetric. To explain this
* compound condition, we need to add that the function
* We are now left only with explaining the two sub-conditions in the
* additional compound condition that is checked below for deciding
* whether the scenario is asymmetric. To explain the first
* sub-condition, we need to add that the function
* bfq_asymmetric_scenario checks the weights of only
* non-weight-raised queues, for efficiency reasons (see
* comments on bfq_weights_tree_add()). Then the fact that
* bfqq is weight-raised is checked explicitly here. More
* precisely, the compound condition below takes into account
* also the fact that, even if bfqq is being weight-raised,
* the scenario is still symmetric if all queues with requests
* waiting for completion happen to be
* weight-raised. Actually, we should be even more precise
* here, and differentiate between interactive weight raising
* and soft real-time weight raising.
* non-weight-raised queues, for efficiency reasons (see comments on
* bfq_weights_tree_add()). Then the fact that bfqq is weight-raised
* is checked explicitly here. More precisely, the compound condition
* below takes into account also the fact that, even if bfqq is being
* weight-raised, the scenario is still symmetric if all queues with
* requests waiting for completion happen to be
* weight-raised. Actually, we should be even more precise here, and
* differentiate between interactive weight raising and soft real-time
* weight raising.
*
* The second sub-condition checked in the compound condition is
* whether there is a fair amount of already in-flight I/O not
* belonging to bfqq. If so, I/O dispatching is to be plugged, for the
* following reason. The drive may decide to serve in-flight
* non-bfqq's I/O requests before bfqq's ones, thereby delaying the
* arrival of new I/O requests for bfqq (recall that bfqq is sync). If
* I/O-dispatching is not plugged, then, while bfqq remains empty, a
* basically uncontrolled amount of I/O from other queues may be
* dispatched too, possibly causing the service of bfqq's I/O to be
* delayed even longer in the drive. This problem gets more and more
* serious as the speed and the queue depth of the drive grow,
* because, as these two quantities grow, the probability to find no
* queue busy but many requests in flight grows too. By contrast,
* plugging I/O dispatching minimizes the delay induced by already
* in-flight I/O, and enables bfqq to recover the bandwidth it may
* lose because of this delay.
*
* As a side note, it is worth considering that the above
* device-idling countermeasures may however fail in the
* following unlucky scenario: if idling is (correctly)
* disabled in a time period during which all symmetry
* sub-conditions hold, and hence the device is allowed to
* enqueue many requests, but at some later point in time some
* sub-condition stops to hold, then it may become impossible
* to let requests be served in the desired order until all
* the requests already queued in the device have been served.
* device-idling countermeasures may however fail in the following
* unlucky scenario: if I/O-dispatch plugging is (correctly) disabled
* in a time period during which all symmetry sub-conditions hold, and
* therefore the device is allowed to enqueue many requests, but at
* some later point in time some sub-condition stops to hold, then it
* may become impossible to make requests be served in the desired
* order until all the requests already queued in the device have been
* served. The last sub-condition commented above somewhat mitigates
* this problem for weight-raised queues.
*/
static bool idling_needed_for_service_guarantees(struct bfq_data *bfqd,
struct bfq_queue *bfqq)
{
return (bfqq->wr_coeff > 1 &&
bfqd->wr_busy_queues <
bfq_tot_busy_queues(bfqd)) ||
(bfqd->wr_busy_queues <
bfq_tot_busy_queues(bfqd) ||
bfqd->rq_in_driver >=
bfqq->dispatched + 4)) ||
bfq_asymmetric_scenario(bfqd, bfqq);
}

9
block/blk-cgroup.c
View File

@ -54,7 +54,7 @@ static struct blkcg_policy *blkcg_policy[BLKCG_MAX_POLS];
static LIST_HEAD(all_blkcgs); /* protected by blkcg_pol_mutex */
static bool blkcg_debug_stats = false;
bool blkcg_debug_stats = false;
static struct workqueue_struct *blkcg_punt_bio_wq;
static bool blkcg_policy_enabled(struct request_queue *q,
@ -944,10 +944,7 @@ static int blkcg_print_stat(struct seq_file *sf, void *v)
dbytes, dios);
}
if (!blkcg_debug_stats)
goto next;
if (atomic_read(&blkg->use_delay)) {
if (blkcg_debug_stats && atomic_read(&blkg->use_delay)) {
has_stats = true;
off += scnprintf(buf+off, size-off,
" use_delay=%d delay_nsec=%llu",
@ -967,7 +964,7 @@ static int blkcg_print_stat(struct seq_file *sf, void *v)
has_stats = true;
off += written;
}
next:
if (has_stats) {
if (off < size - 1) {
off += scnprintf(buf+off, size-off, "\n");

3
block/blk-iolatency.c
View File

@ -917,6 +917,9 @@ static size_t iolatency_pd_stat(struct blkg_policy_data *pd, char *buf,
unsigned long long avg_lat;
unsigned long long cur_win;
if (!blkcg_debug_stats)
return 0;
if (iolat->ssd)
return iolatency_ssd_stat(iolat, buf, size);

9
block/blk-mq-sched.h
View File

@ -61,15 +61,6 @@ static inline void blk_mq_sched_completed_request(struct request *rq, u64 now)
e->type->ops.completed_request(rq, now);
}
static inline void blk_mq_sched_started_request(struct request *rq)
{
struct request_queue *q = rq->q;
struct elevator_queue *e = q->elevator;
if (e && e->type->ops.started_request)
e->type->ops.started_request(rq);
}
static inline void blk_mq_sched_requeue_request(struct request *rq)
{
struct request_queue *q = rq->q;

10
block/blk-mq.c
View File

@ -669,8 +669,6 @@ void blk_mq_start_request(struct request *rq)
{
struct request_queue *q = rq->q;
blk_mq_sched_started_request(rq);
trace_block_rq_issue(q, rq);
if (test_bit(QUEUE_FLAG_STATS, &q->queue_flags)) {
@ -1960,9 +1958,13 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio)
rq = blk_mq_get_request(q, bio, &data);
if (unlikely(!rq)) {
rq_qos_cleanup(q, bio);
if (bio->bi_opf & REQ_NOWAIT)
cookie = BLK_QC_T_NONE;
if (bio->bi_opf & REQ_NOWAIT_INLINE)
cookie = BLK_QC_T_EAGAIN;
else if (bio->bi_opf & REQ_NOWAIT)
bio_wouldblock_error(bio);
return BLK_QC_T_NONE;
return cookie;
}
trace_block_getrq(q, bio, bio->bi_opf);

7
block/blk-rq-qos.c
View File

@ -202,6 +202,7 @@ static int rq_qos_wake_function(struct wait_queue_entry *curr,
return -1;
data->got_token = true;
smp_wmb();
list_del_init(&curr->entry);
wake_up_process(data->task);
return 1;
@ -244,7 +245,9 @@ void rq_qos_wait(struct rq_wait *rqw, void *private_data,
return;
prepare_to_wait_exclusive(&rqw->wait, &data.wq, TASK_UNINTERRUPTIBLE);
has_sleeper = !wq_has_single_sleeper(&rqw->wait);
do {
/* The memory barrier in set_task_state saves us here. */
if (data.got_token)
break;
if (!has_sleeper && acquire_inflight_cb(rqw, private_data)) {
@ -255,12 +258,14 @@ void rq_qos_wait(struct rq_wait *rqw, void *private_data,
* which means we now have two. Put our local token
* and wake anyone else potentially waiting for one.
*/
smp_rmb();
if (data.got_token)
cleanup_cb(rqw, private_data);
break;
}
io_schedule();
has_sleeper = false;
has_sleeper = true;
set_current_state(TASK_UNINTERRUPTIBLE);
} while (1);
finish_wait(&rqw->wait, &data.wq);
}

2
block/genhd.c
View File

@ -1969,7 +1969,7 @@ static const struct attribute *disk_events_attrs[] = {
* The default polling interval can be specified by the kernel
* parameter block.events_dfl_poll_msecs which defaults to 0
* (disable). This can also be modified runtime by writing to
* /sys/module/block/events_dfl_poll_msecs.
* /sys/module/block/parameters/events_dfl_poll_msecs.
*/
static int disk_events_set_dfl_poll_msecs(const char *val,
const struct kernel_param *kp)

1
drivers/ata/libahci_platform.c
View File

@ -408,7 +408,6 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
hpriv->mmio = devm_ioremap_resource(dev,
platform_get_resource(pdev, IORESOURCE_MEM, 0));
if (IS_ERR(hpriv->mmio)) {
dev_err(dev, "no mmio space\n");
rc = PTR_ERR(hpriv->mmio);
goto err_out;
}

14
drivers/block/drbd/drbd_receiver.c
View File

@ -5417,7 +5417,7 @@ static int drbd_do_auth(struct drbd_connection *connection)
unsigned int key_len;
char secret[SHARED_SECRET_MAX]; /* 64 byte */
unsigned int resp_size;
SHASH_DESC_ON_STACK(desc, connection->cram_hmac_tfm);
struct shash_desc *desc;
struct packet_info pi;
struct net_conf *nc;
int err, rv;
@ -5430,6 +5430,13 @@ static int drbd_do_auth(struct drbd_connection *connection)
memcpy(secret, nc->shared_secret, key_len);
rcu_read_unlock();
desc = kmalloc(sizeof(struct shash_desc) +
crypto_shash_descsize(connection->cram_hmac_tfm),
GFP_KERNEL);
if (!desc) {
rv = -1;
goto fail;
}
desc->tfm = connection->cram_hmac_tfm;
rv = crypto_shash_setkey(connection->cram_hmac_tfm, (u8 *)secret, key_len);
@ -5571,7 +5578,10 @@ static int drbd_do_auth(struct drbd_connection *connection)
kfree(peers_ch);
kfree(response);
kfree(right_response);
shash_desc_zero(desc);
if (desc) {
shash_desc_zero(desc);
kfree(desc);
}
return rv;
}

3
drivers/md/bcache/super.c
View File

@ -931,6 +931,9 @@ int bch_cached_dev_run(struct cached_dev *dc)
if (dc->io_disable) {
pr_err("I/O disabled on cached dev %s",
dc->backing_dev_name);
kfree(env[1]);
kfree(env[2]);
kfree(buf);
return -EIO;
}

14
drivers/nvme/host/core.c
View File

@ -2311,15 +2311,13 @@ static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ct
memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off);
}
static void __nvme_release_subsystem(struct nvme_subsystem *subsys)
{
ida_simple_remove(&nvme_subsystems_ida, subsys->instance);
kfree(subsys);
}
static void nvme_release_subsystem(struct device *dev)
{
__nvme_release_subsystem(container_of(dev, struct nvme_subsystem, dev));
struct nvme_subsystem *subsys =
container_of(dev, struct nvme_subsystem, dev);
ida_simple_remove(&nvme_subsystems_ida, subsys->instance);
kfree(subsys);
}
static void nvme_destroy_subsystem(struct kref *ref)
@ -2477,7 +2475,7 @@ static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
mutex_lock(&nvme_subsystems_lock);
found = __nvme_find_get_subsystem(subsys->subnqn);
if (found) {
__nvme_release_subsystem(subsys);
put_device(&subsys->dev);
subsys = found;
if (!nvme_validate_cntlid(subsys, ctrl, id)) {

8
drivers/nvme/host/multipath.c
View File

@ -12,11 +12,6 @@ module_param(multipath, bool, 0444);
MODULE_PARM_DESC(multipath,
"turn on native support for multiple controllers per subsystem");
inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
{
return multipath && ctrl->subsys && (ctrl->subsys->cmic & (1 << 3));
}
/*
* If multipathing is enabled we need to always use the subsystem instance
* number for numbering our devices to avoid conflicts between subsystems that
@ -622,7 +617,8 @@ int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
{
int error;
if (!nvme_ctrl_use_ana(ctrl))
/* check if multipath is enabled and we have the capability */
if (!multipath || !ctrl->subsys || !(ctrl->subsys->cmic & (1 << 3)))
return 0;
ctrl->anacap = id->anacap;

6
drivers/nvme/host/nvme.h
View File

@ -485,7 +485,11 @@ extern const struct attribute_group *nvme_ns_id_attr_groups[];
extern const struct block_device_operations nvme_ns_head_ops;
#ifdef CONFIG_NVME_MULTIPATH
bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl);
static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
{
return ctrl->ana_log_buf != NULL;
}
void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
struct nvme_ctrl *ctrl, int *flags);
void nvme_failover_req(struct request *req);

6
drivers/nvme/host/pci.c
View File

@ -2254,9 +2254,7 @@ static int nvme_dev_add(struct nvme_dev *dev)
if (!dev->ctrl.tagset) {
dev->tagset.ops = &nvme_mq_ops;
dev->tagset.nr_hw_queues = dev->online_queues - 1;
dev->tagset.nr_maps = 1; /* default */
if (dev->io_queues[HCTX_TYPE_READ])
dev->tagset.nr_maps++;
dev->tagset.nr_maps = 2; /* default + read */
if (dev->io_queues[HCTX_TYPE_POLL])
dev->tagset.nr_maps++;
dev->tagset.timeout = NVME_IO_TIMEOUT;
@ -3029,6 +3027,8 @@ static const struct pci_device_id nvme_id_table[] = {
.driver_data = NVME_QUIRK_LIGHTNVM, },
{ PCI_DEVICE(0x1d1d, 0x2601), /* CNEX Granby */
.driver_data = NVME_QUIRK_LIGHTNVM, },
{ PCI_DEVICE(0x10ec, 0x5762), /* ADATA SX6000LNP */
.driver_data = NVME_QUIRK_IGNORE_DEV_SUBNQN, },
{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) },
{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2003) },

58
fs/block_dev.c
View File

@ -345,15 +345,24 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
struct bio *bio;
bool is_poll = (iocb->ki_flags & IOCB_HIPRI) != 0;
bool is_read = (iov_iter_rw(iter) == READ), is_sync;
bool nowait = (iocb->ki_flags & IOCB_NOWAIT) != 0;
loff_t pos = iocb->ki_pos;
blk_qc_t qc = BLK_QC_T_NONE;
int ret = 0;
gfp_t gfp;
ssize_t ret;
if ((pos | iov_iter_alignment(iter)) &
(bdev_logical_block_size(bdev) - 1))
return -EINVAL;
bio = bio_alloc_bioset(GFP_KERNEL, nr_pages, &blkdev_dio_pool);
if (nowait)
gfp = GFP_NOWAIT;
else
gfp = GFP_KERNEL;
bio = bio_alloc_bioset(gfp, nr_pages, &blkdev_dio_pool);
if (!bio)
return -EAGAIN;
dio = container_of(bio, struct blkdev_dio, bio);
dio->is_sync = is_sync = is_sync_kiocb(iocb);
@ -375,7 +384,10 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
if (!is_poll)
blk_start_plug(&plug);
ret = 0;
for (;;) {
int err;
bio_set_dev(bio, bdev);
bio->bi_iter.bi_sector = pos >> 9;
bio->bi_write_hint = iocb->ki_hint;
@ -383,8 +395,10 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
bio->bi_end_io = blkdev_bio_end_io;
bio->bi_ioprio = iocb->ki_ioprio;
ret = bio_iov_iter_get_pages(bio, iter);
if (unlikely(ret)) {
err = bio_iov_iter_get_pages(bio, iter);
if (unlikely(err)) {
if (!ret)
ret = err;
bio->bi_status = BLK_STS_IOERR;
bio_endio(bio);
break;
@ -399,6 +413,14 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
task_io_account_write(bio->bi_iter.bi_size);
}
/*
* Tell underlying layer to not block for resource shortage.
* And if we would have blocked, return error inline instead
* of through the bio->bi_end_io() callback.
*/
if (nowait)
bio->bi_opf |= (REQ_NOWAIT | REQ_NOWAIT_INLINE);
dio->size += bio->bi_iter.bi_size;
pos += bio->bi_iter.bi_size;
@ -412,6 +434,11 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
}
qc = submit_bio(bio);
if (qc == BLK_QC_T_EAGAIN) {
if (!ret)
ret = -EAGAIN;
goto error;
}
if (polled)
WRITE_ONCE(iocb->ki_cookie, qc);
@ -432,8 +459,20 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
atomic_inc(&dio->ref);
}
submit_bio(bio);
bio = bio_alloc(GFP_KERNEL, nr_pages);
qc = submit_bio(bio);
if (qc == BLK_QC_T_EAGAIN) {
if (!ret)
ret = -EAGAIN;
goto error;
}
ret += bio->bi_iter.bi_size;
bio = bio_alloc(gfp, nr_pages);
if (!bio) {
if (!ret)
ret = -EAGAIN;
goto error;
}
}
if (!is_poll)
@ -453,13 +492,16 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
}
__set_current_state(TASK_RUNNING);
out:
if (!ret)
ret = blk_status_to_errno(dio->bio.bi_status);
if (likely(!ret))
ret = dio->size;
bio_put(&dio->bio);
return ret;
error:
if (!is_poll)
blk_finish_plug(&plug);
goto out;
}
static ssize_t

79
fs/io_uring.c
View File

@ -202,7 +202,7 @@ struct async_list {
struct file *file;
off_t io_end;
size_t io_pages;
size_t io_len;
};
struct io_ring_ctx {
@ -333,7 +333,8 @@ struct io_kiocb {
#define REQ_F_IO_DRAIN 16 /* drain existing IO first */
#define REQ_F_IO_DRAINED 32 /* drain done */
#define REQ_F_LINK 64 /* linked sqes */
#define REQ_F_FAIL_LINK 128 /* fail rest of links */
#define REQ_F_LINK_DONE 128 /* linked sqes done */
#define REQ_F_FAIL_LINK 256 /* fail rest of links */
u64 user_data;
u32 result;
u32 sequence;
@ -429,7 +430,7 @@ static inline bool io_sequence_defer(struct io_ring_ctx *ctx,
if ((req->flags & (REQ_F_IO_DRAIN|REQ_F_IO_DRAINED)) != REQ_F_IO_DRAIN)
return false;
return req->sequence > ctx->cached_cq_tail + ctx->sq_ring->dropped;
return req->sequence != ctx->cached_cq_tail + ctx->sq_ring->dropped;
}
static struct io_kiocb *io_get_deferred_req(struct io_ring_ctx *ctx)
@ -632,6 +633,7 @@ static void io_req_link_next(struct io_kiocb *req)
nxt->flags |= REQ_F_LINK;
}
nxt->flags |= REQ_F_LINK_DONE;
INIT_WORK(&nxt->work, io_sq_wq_submit_work);
queue_work(req->ctx->sqo_wq, &nxt->work);
}
@ -1064,8 +1066,44 @@ static int io_import_fixed(struct io_ring_ctx *ctx, int rw,
*/
offset = buf_addr - imu->ubuf;
iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len);
if (offset)
iov_iter_advance(iter, offset);
if (offset) {
/*
* Don't use iov_iter_advance() here, as it's really slow for
* using the latter parts of a big fixed buffer - it iterates
* over each segment manually. We can cheat a bit here, because
* we know that:
*
* 1) it's a BVEC iter, we set it up
* 2) all bvecs are PAGE_SIZE in size, except potentially the
* first and last bvec
*
* So just find our index, and adjust the iterator afterwards.
* If the offset is within the first bvec (or the whole first
* bvec, just use iov_iter_advance(). This makes it easier
* since we can just skip the first segment, which may not
* be PAGE_SIZE aligned.
*/
const struct bio_vec *bvec = imu->bvec;
if (offset <= bvec->bv_len) {
iov_iter_advance(iter, offset);
} else {
unsigned long seg_skip;
/* skip first vec */
offset -= bvec->bv_len;
seg_skip = 1 + (offset >> PAGE_SHIFT);
iter->bvec = bvec + seg_skip;
iter->nr_segs -= seg_skip;
iter->count -= (seg_skip << PAGE_SHIFT);
iter->iov_offset = offset & ~PAGE_MASK;
if (iter->iov_offset)
iter->count -= iter->iov_offset;
}
}
return 0;
}
@ -1120,28 +1158,26 @@ static void io_async_list_note(int rw, struct io_kiocb *req, size_t len)
off_t io_end = kiocb->ki_pos + len;
if (filp == async_list->file && kiocb->ki_pos == async_list->io_end) {
unsigned long max_pages;
unsigned long max_bytes;
/* Use 8x RA size as a decent limiter for both reads/writes */
max_pages = filp->f_ra.ra_pages;
if (!max_pages)
max_pages = VM_READAHEAD_PAGES;
max_pages *= 8;
max_bytes = filp->f_ra.ra_pages << (PAGE_SHIFT + 3);
if (!max_bytes)
max_bytes = VM_READAHEAD_PAGES << (PAGE_SHIFT + 3);
/* If max pages are exceeded, reset the state */
len >>= PAGE_SHIFT;
if (async_list->io_pages + len <= max_pages) {
/* If max len are exceeded, reset the state */
if (async_list->io_len + len <= max_bytes) {
req->flags |= REQ_F_SEQ_PREV;
async_list->io_pages += len;
async_list->io_len += len;
} else {
io_end = 0;
async_list->io_pages = 0;
async_list->io_len = 0;
}
}
/* New file? Reset state. */
if (async_list->file != filp) {
async_list->io_pages = 0;
async_list->io_len = 0;
async_list->file = filp;
}
async_list->io_end = io_end;
@ -1630,6 +1666,8 @@ static int io_poll_add(struct io_kiocb *req, const struct io_uring_sqe *sqe)
INIT_LIST_HEAD(&poll->wait.entry);
init_waitqueue_func_entry(&poll->wait, io_poll_wake);
INIT_LIST_HEAD(&req->list);
mask = vfs_poll(poll->file, &ipt.pt) & poll->events;
spin_lock_irq(&ctx->completion_lock);
@ -1844,6 +1882,10 @@ static void io_sq_wq_submit_work(struct work_struct *work)
/* async context always use a copy of the sqe */
kfree(sqe);
/* req from defer and link list needn't decrease async cnt */
if (req->flags & (REQ_F_IO_DRAINED | REQ_F_LINK_DONE))
goto out;
if (!async_list)
break;
if (!list_empty(&req_list)) {
@ -1891,6 +1933,7 @@ static void io_sq_wq_submit_work(struct work_struct *work)
}
}
out:
if (cur_mm) {
set_fs(old_fs);
unuse_mm(cur_mm);
@ -1917,6 +1960,10 @@ static bool io_add_to_prev_work(struct async_list *list, struct io_kiocb *req)
ret = true;
spin_lock(&list->lock);
list_add_tail(&req->list, &list->list);
/*
* Ensure we see a simultaneous modification from io_sq_wq_submit_work()
*/
smp_mb();
if (!atomic_read(&list->cnt)) {
list_del_init(&req->list);
ret = false;

1
include/linux/blk-cgroup.h
View File

@ -181,6 +181,7 @@ struct blkcg_policy {
extern struct blkcg blkcg_root;
extern struct cgroup_subsys_state * const blkcg_root_css;
extern bool blkcg_debug_stats;
struct blkcg_gq *blkg_lookup_slowpath(struct blkcg *blkcg,
struct request_queue *q, bool update_hint);

5
include/linux/blk_types.h
View File

@ -311,6 +311,7 @@ enum req_flag_bits {
__REQ_RAHEAD, /* read ahead, can fail anytime */
__REQ_BACKGROUND, /* background IO */
__REQ_NOWAIT, /* Don't wait if request will block */
__REQ_NOWAIT_INLINE, /* Return would-block error inline */
/*
* When a shared kthread needs to issue a bio for a cgroup, doing
* so synchronously can lead to priority inversions as the kthread
@ -345,6 +346,7 @@ enum req_flag_bits {
#define REQ_RAHEAD (1ULL << __REQ_RAHEAD)
#define REQ_BACKGROUND (1ULL << __REQ_BACKGROUND)
#define REQ_NOWAIT (1ULL << __REQ_NOWAIT)
#define REQ_NOWAIT_INLINE (1ULL << __REQ_NOWAIT_INLINE)
#define REQ_CGROUP_PUNT (1ULL << __REQ_CGROUP_PUNT)
#define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP)
@ -418,12 +420,13 @@ static inline int op_stat_group(unsigned int op)
typedef unsigned int blk_qc_t;
#define BLK_QC_T_NONE -1U
#define BLK_QC_T_EAGAIN -2U
#define BLK_QC_T_SHIFT 16
#define BLK_QC_T_INTERNAL (1U << 31)
static inline bool blk_qc_t_valid(blk_qc_t cookie)
{
return cookie != BLK_QC_T_NONE;
return cookie != BLK_QC_T_NONE && cookie != BLK_QC_T_EAGAIN;
}
static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)

1
include/linux/elevator.h
View File

@ -45,7 +45,6 @@ struct elevator_mq_ops {
struct request *(*dispatch_request)(struct blk_mq_hw_ctx *);
bool (*has_work)(struct blk_mq_hw_ctx *);
void (*completed_request)(struct request *, u64);
void (*started_request)(struct request *);
void (*requeue_request)(struct request *);
struct request *(*former_request)(struct request_queue *, struct request *);
struct request *(*next_request)(struct request_queue *, struct request *);

13
include/linux/wait.h
View File

@ -126,6 +126,19 @@ static inline int waitqueue_active(struct wait_queue_head *wq_head)
return !list_empty(&wq_head->head);
}
/**
* wq_has_single_sleeper - check if there is only one sleeper
* @wq_head: wait queue head
*
* Returns true of wq_head has only one sleeper on the list.
*
* Please refer to the comment for waitqueue_active.
*/
static inline bool wq_has_single_sleeper(struct wait_queue_head *wq_head)
{
return list_is_singular(&wq_head->head);
}
/**
* wq_has_sleeper - check if there are any waiting processes
* @wq_head: wait queue head