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dm zone: fix dm_revalidate_zones() memory allocation

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Make sure that the zone write pointer offset array is allocated with a
vmalloc in dm_zone_revalidate_cb() by passing GFP_KERNEL gfp flag to
kvcalloc(). However, since we do not want to trigger IOs while
revalidating zones, change dm_revalidate_zones() to have the zone scan
done in GFP_NOIO context using memalloc_noio_save/restore calls.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: bb37d77239 ("dm: introduce zone append emulation")
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Damien Le Moal 2021-06-19 08:15:19 +09:00 committed by Mike Snitzer
parent 326dbde2e0
commit 28436ba34b
1 changed files with 8 additions and 2 deletions
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10
drivers/md/dm-zone.c
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@ -205,7 +205,7 @@ static int dm_zone_revalidate_cb(struct blk_zone *zone, unsigned int idx,
if (!md->zwp_offset) {
md->zwp_offset =
kvcalloc(q->nr_zones, sizeof(unsigned int),
GFP_NOIO);
GFP_KERNEL);
if (!md->zwp_offset)
return -ENOMEM;
}
@ -230,6 +230,7 @@ static int dm_zone_revalidate_cb(struct blk_zone *zone, unsigned int idx,
static int dm_revalidate_zones(struct mapped_device *md, struct dm_table *t)
{
struct request_queue *q = md->queue;
unsigned int noio_flag;
int ret;
/*
@ -241,9 +242,14 @@ static int dm_revalidate_zones(struct mapped_device *md, struct dm_table *t)
if (md->nr_zones)
return 0;
/* Scan all zones to initialize everything */
/*
* Scan all zones to initialize everything. Ensure that all vmalloc
* operations in this context are done as if GFP_NOIO was specified.
*/
noio_flag = memalloc_noio_save();
ret = dm_blk_do_report_zones(md, t, 0, q->nr_zones,
dm_zone_revalidate_cb, md);
memalloc_noio_restore(noio_flag);
if (ret < 0)
goto err;
if (ret != q->nr_zones) {