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block: limit disk max sectors to (LLONG_MAX >> 9)

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Kernel `loff_t` is defined as `long long int`, so we can't support disk
which size is > LLONG_MAX.

There are many virtual block drivers, and hardware may report bad capacity
too, so limit max sectors to (LLONG_MAX >> 9) for avoiding potential
trouble.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20250115092648.1104452-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2025-01-15 17:26:48 +08:00 • committed by Jens Axboe
parent 5d1f7ee7f0
commit 3d9a9e9a77
2 changed files with 12 additions and 0 deletions
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2
block/blk.h
View file

@ -13,6 +13,8 @@
struct elevator_type;
#define BLK_DEV_MAX_SECTORS (LLONG_MAX >> 9)
/* Max future timer expiry for timeouts */
#define BLK_MAX_TIMEOUT (5 * HZ)

10
block/genhd.c
View file

@ -58,6 +58,13 @@ static DEFINE_IDA(ext_devt_ida);
void set_capacity(struct gendisk *disk, sector_t sectors)
{
if (sectors > BLK_DEV_MAX_SECTORS) {
pr_warn_once("%s: truncate capacity from %lld to %lld\n",
disk->disk_name, sectors,
BLK_DEV_MAX_SECTORS);
sectors = BLK_DEV_MAX_SECTORS;
}
bdev_set_nr_sectors(disk->part0, sectors);
}
EXPORT_SYMBOL(set_capacity);
@ -400,6 +407,9 @@ int __must_check add_disk_fwnode(struct device *parent, struct gendisk *disk,
struct device *ddev = disk_to_dev(disk);
int ret;
if (WARN_ON_ONCE(bdev_nr_sectors(disk->part0) > BLK_DEV_MAX_SECTORS))
return -EINVAL;
if (queue_is_mq(disk->queue)) {
/*
* ->submit_bio and ->poll_bio are bypassed for blk-mq drivers.