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for-linus-20191115 

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Merge tag 'for-linus-20191115' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "A few fixes that should make it into this release. This contains:

   - io_uring:
        - The timeout command assumes sequence == 0 means that we want
          one completion, but this kind of overloading is unfortunate as
          it prevents users from doing a pure time based wait. Since
          this operation was introduced in this cycle, let's correct it
          now, while we can. (me)
        - One-liner to fix an issue with dependent links and fixed
          buffer reads. The actual IO completed fine, but the link got
          severed since we stored the wrong expected value. (me)
        - Add TIMEOUT to list of opcodes that don't need a file. (Pavel)

   - rsxx missing workqueue destry calls. Old bug. (Chuhong)

   - Fix blk-iocost active list check (Jiufei)

   - Fix impossible-to-hit overflow merge condition, that still hit some
     folks very rarely (Junichi)

   - Fix bfq hang issue from 5.3. This didn't get marked for stable, but
     will go into stable post this merge (Paolo)"

* tag 'for-linus-20191115' of git://git.kernel.dk/linux-block:
  rsxx: add missed destroy_workqueue calls in remove
  iocost: check active_list of all the ancestors in iocg_activate()
  block, bfq: deschedule empty bfq_queues not referred by any process
  io_uring: ensure registered buffer import returns the IO length
  io_uring: Fix getting file for timeout
  block: check bi_size overflow before merge
  io_uring: make timeout sequence == 0 mean no sequence
This commit is contained in:
Linus Torvalds 2019-11-15 13:02:34 -08:00
parent 875fef493f dcb77e4b27
commit b226c9e1f4
5 changed files with 59 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
block/bfq-iosched.c
View File

@ -2713,6 +2713,28 @@ static void bfq_bfqq_save_state(struct bfq_queue *bfqq)
}
}
static
void bfq_release_process_ref(struct bfq_data *bfqd, struct bfq_queue *bfqq)
{
/*
* To prevent bfqq's service guarantees from being violated,
* bfqq may be left busy, i.e., queued for service, even if
* empty (see comments in __bfq_bfqq_expire() for
* details). But, if no process will send requests to bfqq any
* longer, then there is no point in keeping bfqq queued for
* service. In addition, keeping bfqq queued for service, but
* with no process ref any longer, may have caused bfqq to be
* freed when dequeued from service. But this is assumed to
* never happen.
*/
if (bfq_bfqq_busy(bfqq) && RB_EMPTY_ROOT(&bfqq->sort_list) &&
bfqq != bfqd->in_service_queue)
bfq_del_bfqq_busy(bfqd, bfqq, false);
bfq_put_queue(bfqq);
}
static void
bfq_merge_bfqqs(struct bfq_data *bfqd, struct bfq_io_cq *bic,
struct bfq_queue *bfqq, struct bfq_queue *new_bfqq)
@ -2783,8 +2805,7 @@ bfq_merge_bfqqs(struct bfq_data *bfqd, struct bfq_io_cq *bic,
*/
new_bfqq->pid = -1;
bfqq->bic = NULL;
/* release process reference to bfqq */
bfq_put_queue(bfqq);
bfq_release_process_ref(bfqd, bfqq);
}
static bool bfq_allow_bio_merge(struct request_queue *q, struct request *rq,
@ -4899,7 +4920,7 @@ static void bfq_exit_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq)
bfq_put_cooperator(bfqq);
bfq_put_queue(bfqq); /* release process reference */
bfq_release_process_ref(bfqd, bfqq);
}
static void bfq_exit_icq_bfqq(struct bfq_io_cq *bic, bool is_sync)
@ -5001,8 +5022,7 @@ static void bfq_check_ioprio_change(struct bfq_io_cq *bic, struct bio *bio)
bfqq = bic_to_bfqq(bic, false);
if (bfqq) {
/* release process reference on this queue */
bfq_put_queue(bfqq);
bfq_release_process_ref(bfqd, bfqq);
bfqq = bfq_get_queue(bfqd, bio, BLK_RW_ASYNC, bic);
bic_set_bfqq(bic, bfqq, false);
}
@ -5963,7 +5983,7 @@ bfq_split_bfqq(struct bfq_io_cq *bic, struct bfq_queue *bfqq)
bfq_put_cooperator(bfqq);
bfq_put_queue(bfqq);
bfq_release_process_ref(bfqq->bfqd, bfqq);
return NULL;
}

2
block/bio.c
View File

@ -751,7 +751,7 @@ bool __bio_try_merge_page(struct bio *bio, struct page *page,
if (WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)))
return false;
if (bio->bi_vcnt > 0) {
if (bio->bi_vcnt > 0 && !bio_full(bio, len)) {
struct bio_vec *bv = &bio->bi_io_vec[bio->bi_vcnt - 1];
if (page_is_mergeable(bv, page, len, off, same_page)) {

8
block/blk-iocost.c
View File

@ -1057,9 +1057,12 @@ static bool iocg_activate(struct ioc_gq *iocg, struct ioc_now *now)
atomic64_set(&iocg->active_period, cur_period);
/* already activated or breaking leaf-only constraint? */
for (i = iocg->level; i > 0; i--)
if (!list_empty(&iocg->active_list))
if (!list_empty(&iocg->active_list))
goto succeed_unlock;
for (i = iocg->level - 1; i > 0; i--)
if (!list_empty(&iocg->ancestors[i]->active_list))
goto fail_unlock;
if (iocg->child_active_sum)
goto fail_unlock;
@ -1101,6 +1104,7 @@ static bool iocg_activate(struct ioc_gq *iocg, struct ioc_now *now)
ioc_start_period(ioc, now);
}
succeed_unlock:
spin_unlock_irq(&ioc->lock);
return true;

2
drivers/block/rsxx/core.c
View File

@ -1000,8 +1000,10 @@ static void rsxx_pci_remove(struct pci_dev *dev)
cancel_work_sync(&card->event_work);
destroy_workqueue(card->event_wq);
rsxx_destroy_dev(card);
rsxx_dma_destroy(card);
destroy_workqueue(card->creg_ctrl.creg_wq);
spin_lock_irqsave(&card->irq_lock, flags);
rsxx_disable_ier_and_isr(card, CR_INTR_ALL);

32
fs/io_uring.c
View File

@ -326,6 +326,7 @@ struct io_kiocb {
#define REQ_F_TIMEOUT 1024 /* timeout request */
#define REQ_F_ISREG 2048 /* regular file */
#define REQ_F_MUST_PUNT 4096 /* must be punted even for NONBLOCK */
#define REQ_F_TIMEOUT_NOSEQ 8192 /* no timeout sequence */
u64 user_data;
u32 result;
u32 sequence;
@ -453,9 +454,13 @@ static struct io_kiocb *io_get_timeout_req(struct io_ring_ctx *ctx)
struct io_kiocb *req;
req = list_first_entry_or_null(&ctx->timeout_list, struct io_kiocb, list);
if (req && !__io_sequence_defer(ctx, req)) {
list_del_init(&req->list);
return req;
if (req) {
if (req->flags & REQ_F_TIMEOUT_NOSEQ)
return NULL;
if (!__io_sequence_defer(ctx, req)) {
list_del_init(&req->list);
return req;
}
}
return NULL;
@ -1225,7 +1230,7 @@ static int io_import_fixed(struct io_ring_ctx *ctx, int rw,
}
}
return 0;
return len;
}
static ssize_t io_import_iovec(struct io_ring_ctx *ctx, int rw,
@ -1941,18 +1946,24 @@ static int io_timeout(struct io_kiocb *req, const struct io_uring_sqe *sqe)
if (get_timespec64(&ts, u64_to_user_ptr(sqe->addr)))
return -EFAULT;
req->flags |= REQ_F_TIMEOUT;
/*
* sqe->off holds how many events that need to occur for this
* timeout event to be satisfied.
* timeout event to be satisfied. If it isn't set, then this is
* a pure timeout request, sequence isn't used.
*/
count = READ_ONCE(sqe->off);
if (!count)
count = 1;
if (!count) {
req->flags |= REQ_F_TIMEOUT_NOSEQ;
spin_lock_irq(&ctx->completion_lock);
entry = ctx->timeout_list.prev;
goto add;
}
req->sequence = ctx->cached_sq_head + count - 1;
/* reuse it to store the count */
req->submit.sequence = count;
req->flags |= REQ_F_TIMEOUT;
/*
* Insertion sort, ensuring the first entry in the list is always
@ -1964,6 +1975,9 @@ static int io_timeout(struct io_kiocb *req, const struct io_uring_sqe *sqe)
unsigned nxt_sq_head;
long long tmp, tmp_nxt;
if (nxt->flags & REQ_F_TIMEOUT_NOSEQ)
continue;
/*
* Since cached_sq_head + count - 1 can overflow, use type long
* long to store it.
@ -1990,6 +2004,7 @@ static int io_timeout(struct io_kiocb *req, const struct io_uring_sqe *sqe)
nxt->sequence++;
}
req->sequence -= span;
add:
list_add(&req->list, entry);
spin_unlock_irq(&ctx->completion_lock);
@ -2283,6 +2298,7 @@ static bool io_op_needs_file(const struct io_uring_sqe *sqe)
switch (op) {
case IORING_OP_NOP:
case IORING_OP_POLL_REMOVE:
case IORING_OP_TIMEOUT:
return false;
default:
return true;