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block-5.15-2021-09-05 

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Merge tag 'block-5.15-2021-09-05' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "Was going to send this one in later this week, but given that -Werror
  is now enabled (or at least available), the mq-deadline fix really
  should go in for the folks hitting that.

   - Ensure dd_queued() is only there if needed (Geert)

   - Fix a kerneldoc warning for bio_alloc_kiocb()

   - BFQ fix for queue merging

   - loop locking fix (Tetsuo)"

* tag 'block-5.15-2021-09-05' of git://git.kernel.dk/linux-block:
  loop: reduce the loop_ctl_mutex scope
  bio: fix kerneldoc documentation for bio_alloc_kiocb()
  block, bfq: honor already-setup queue merges
  block/mq-deadline: Move dd_queued() to fix defined but not used warning
This commit is contained in:
Linus Torvalds 2021-09-06 10:06:26 -07:00
parent 03085b3d5a 1c500ad706
commit 1dbe7e386f
5 changed files with 70 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
block/bfq-iosched.c
View File

@ -2662,6 +2662,15 @@ bfq_setup_merge(struct bfq_queue *bfqq, struct bfq_queue *new_bfqq)
* are likely to increase the throughput.
*/
bfqq->new_bfqq = new_bfqq;
/*
* The above assignment schedules the following redirections:
* each time some I/O for bfqq arrives, the process that
* generated that I/O is disassociated from bfqq and
* associated with new_bfqq. Here we increases new_bfqq->ref
* in advance, adding the number of processes that are
* expected to be associated with new_bfqq as they happen to
* issue I/O.
*/
new_bfqq->ref += process_refs;
return new_bfqq;
}
@ -2724,6 +2733,10 @@ bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq,
{
struct bfq_queue *in_service_bfqq, *new_bfqq;
/* if a merge has already been setup, then proceed with that first */
if (bfqq->new_bfqq)
return bfqq->new_bfqq;
/*
* Check delayed stable merge for rotational or non-queueing
* devs. For this branch to be executed, bfqq must not be
@ -2825,9 +2838,6 @@ bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq,
if (bfq_too_late_for_merging(bfqq))
return NULL;
if (bfqq->new_bfqq)
return bfqq->new_bfqq;
if (!io_struct || unlikely(bfqq == &bfqd->oom_bfqq))
return NULL;

2
block/bio.c
View File

@ -1688,7 +1688,7 @@ EXPORT_SYMBOL(bioset_init_from_src);
/**
* bio_alloc_kiocb - Allocate a bio from bio_set based on kiocb
* @kiocb: kiocb describing the IO
* @nr_iovecs: number of iovecs to pre-allocate
* @nr_vecs: number of iovecs to pre-allocate
* @bs: bio_set to allocate from
*
* Description:

12
block/mq-deadline.c
View File

@ -270,12 +270,6 @@ deadline_move_request(struct deadline_data *dd, struct dd_per_prio *per_prio,
deadline_remove_request(rq->q, per_prio, rq);
}
/* Number of requests queued for a given priority level. */
static u32 dd_queued(struct deadline_data *dd, enum dd_prio prio)
{
return dd_sum(dd, inserted, prio) - dd_sum(dd, completed, prio);
}
/*
* deadline_check_fifo returns 0 if there are no expired requests on the fifo,
* 1 otherwise. Requires !list_empty(&dd->fifo_list[data_dir])
@ -953,6 +947,12 @@ static int dd_async_depth_show(void *data, struct seq_file *m)
return 0;
}
/* Number of requests queued for a given priority level. */
static u32 dd_queued(struct deadline_data *dd, enum dd_prio prio)
{
return dd_sum(dd, inserted, prio) - dd_sum(dd, completed, prio);
}
static int dd_queued_show(void *data, struct seq_file *m)
{
struct request_queue *q = data;

75
drivers/block/loop.c
View File

@ -2111,18 +2111,6 @@ int loop_register_transfer(struct loop_func_table *funcs)
return 0;
}
static int unregister_transfer_cb(int id, void *ptr, void *data)
{
struct loop_device *lo = ptr;
struct loop_func_table *xfer = data;
mutex_lock(&lo->lo_mutex);
if (lo->lo_encryption == xfer)
loop_release_xfer(lo);
mutex_unlock(&lo->lo_mutex);
return 0;
}
int loop_unregister_transfer(int number)
{
unsigned int n = number;
@ -2130,9 +2118,20 @@ int loop_unregister_transfer(int number)
if (n == 0 || n >= MAX_LO_CRYPT || (xfer = xfer_funcs[n]) == NULL)
return -EINVAL;
/*
* This function is called from only cleanup_cryptoloop().
* Given that each loop device that has a transfer enabled holds a
* reference to the module implementing it we should never get here
* with a transfer that is set (unless forced module unloading is
* requested). Thus, check module's refcount and warn if this is
* not a clean unloading.
*/
#ifdef CONFIG_MODULE_UNLOAD
if (xfer->owner && module_refcount(xfer->owner) != -1)
pr_err("Danger! Unregistering an in use transfer function.\n");
#endif
xfer_funcs[n] = NULL;
idr_for_each(&loop_index_idr, &unregister_transfer_cb, xfer);
return 0;
}
@ -2323,8 +2322,9 @@ static int loop_add(int i)
} else {
err = idr_alloc(&loop_index_idr, lo, 0, 0, GFP_KERNEL);
}
mutex_unlock(&loop_ctl_mutex);
if (err < 0)
goto out_unlock;
goto out_free_dev;
i = err;
err = -ENOMEM;
@ -2393,15 +2393,19 @@ static int loop_add(int i)
disk->events = DISK_EVENT_MEDIA_CHANGE;
disk->event_flags = DISK_EVENT_FLAG_UEVENT;
sprintf(disk->disk_name, "loop%d", i);
/* Make this loop device reachable from pathname. */
add_disk(disk);
/* Show this loop device. */
mutex_lock(&loop_ctl_mutex);
lo->idr_visible = true;
mutex_unlock(&loop_ctl_mutex);
return i;
out_cleanup_tags:
blk_mq_free_tag_set(&lo->tag_set);
out_free_idr:
mutex_lock(&loop_ctl_mutex);
idr_remove(&loop_index_idr, i);
out_unlock:
mutex_unlock(&loop_ctl_mutex);
out_free_dev:
kfree(lo);
@ -2411,9 +2415,14 @@ out:
static void loop_remove(struct loop_device *lo)
{
/* Make this loop device unreachable from pathname. */
del_gendisk(lo->lo_disk);
blk_cleanup_disk(lo->lo_disk);
blk_mq_free_tag_set(&lo->tag_set);
mutex_lock(&loop_ctl_mutex);
idr_remove(&loop_index_idr, lo->lo_number);
mutex_unlock(&loop_ctl_mutex);
/* There is no route which can find this loop device. */
mutex_destroy(&lo->lo_mutex);
kfree(lo);
}
@ -2437,31 +2446,40 @@ static int loop_control_remove(int idx)
return -EINVAL;
}
/* Hide this loop device for serialization. */
ret = mutex_lock_killable(&loop_ctl_mutex);
if (ret)
return ret;
lo = idr_find(&loop_index_idr, idx);
if (!lo) {
if (!lo || !lo->idr_visible)
ret = -ENODEV;
goto out_unlock_ctrl;
}
else
lo->idr_visible = false;
mutex_unlock(&loop_ctl_mutex);
if (ret)
return ret;
/* Check whether this loop device can be removed. */
ret = mutex_lock_killable(&lo->lo_mutex);
if (ret)
goto out_unlock_ctrl;
goto mark_visible;
if (lo->lo_state != Lo_unbound ||
atomic_read(&lo->lo_refcnt) > 0) {
mutex_unlock(&lo->lo_mutex);
ret = -EBUSY;
goto out_unlock_ctrl;
goto mark_visible;
}
/* Mark this loop device no longer open()-able. */
lo->lo_state = Lo_deleting;
mutex_unlock(&lo->lo_mutex);
idr_remove(&loop_index_idr, lo->lo_number);
loop_remove(lo);
out_unlock_ctrl:
return 0;
mark_visible:
/* Show this loop device again. */
mutex_lock(&loop_ctl_mutex);
lo->idr_visible = true;
mutex_unlock(&loop_ctl_mutex);
return ret;
}
@ -2475,7 +2493,8 @@ static int loop_control_get_free(int idx)
if (ret)
return ret;
idr_for_each_entry(&loop_index_idr, lo, id) {
if (lo->lo_state == Lo_unbound)
/* Hitting a race results in creating a new loop device which is harmless. */
if (lo->idr_visible && data_race(lo->lo_state) == Lo_unbound)
goto found;
}
mutex_unlock(&loop_ctl_mutex);
@ -2591,10 +2610,14 @@ static void __exit loop_exit(void)
unregister_blkdev(LOOP_MAJOR, "loop");
misc_deregister(&loop_misc);
mutex_lock(&loop_ctl_mutex);
/*
* There is no need to use loop_ctl_mutex here, for nobody else can
* access loop_index_idr when this module is unloading (unless forced
* module unloading is requested). If this is not a clean unloading,
* we have no means to avoid kernel crash.
*/
idr_for_each_entry(&loop_index_idr, lo, id)
loop_remove(lo);
mutex_unlock(&loop_ctl_mutex);
idr_destroy(&loop_index_idr);
}

1
drivers/block/loop.h
View File

@ -68,6 +68,7 @@ struct loop_device {
struct blk_mq_tag_set tag_set;
struct gendisk *lo_disk;
struct mutex lo_mutex;
bool idr_visible;
};
struct loop_cmd {