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aoe: don't call set_capacity from irq context 

Updating the block device size from irq context can lead to torn
writes of the 64-bit value, and prevents us from using normal
process context locking primitives to serialize access to the 64-bit
nr_sectors value.  Defer the set_capacity to the already existing
workqueue handler, where it can be merged with the update of the
block device size by using set_capacity_and_notify.  As an extra
bonus this also adds proper uevent notifications for the resize.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-11-16 15:57:02 +01:00 committed by Jens Axboe
parent 2ebcabf3db
commit 8a6f7bbf29
1 changed files with 4 additions and 11 deletions
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15
drivers/block/aoe/aoecmd.c
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@ -890,19 +890,13 @@ void
aoecmd_sleepwork(struct work_struct *work)
{
struct aoedev *d = container_of(work, struct aoedev, work);
struct block_device *bd;
u64 ssize;
if (d->flags & DEVFL_GDALLOC)
aoeblk_gdalloc(d);
if (d->flags & DEVFL_NEWSIZE) {
ssize = get_capacity(d->gd);
bd = bdget_disk(d->gd, 0);
if (bd) {
bd_set_nr_sectors(bd, ssize);
bdput(bd);
}
set_capacity_and_notify(d->gd, d->ssize);
spin_lock_irq(&d->lock);
d->flags |= DEVFL_UP;
d->flags &= ~DEVFL_NEWSIZE;
@ -971,10 +965,9 @@ ataid_complete(struct aoedev *d, struct aoetgt *t, unsigned char *id)
d->geo.start = 0;
if (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE))
return;
if (d->gd != NULL) {
set_capacity(d->gd, ssize);
if (d->gd != NULL)
d->flags |= DEVFL_NEWSIZE;
} else
else
d->flags |= DEVFL_GDALLOC;
schedule_work(&d->work);
}