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scsi: block: Add a queue_max_bytes() helper

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Return the max_sectors value in bytes.  Lifted from scsi_ioctl.c.

Link: https://lore.kernel.org/r/20210724072033.1284840-13-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2021-07-24 09:20:21 +02:00 committed by Martin K. Petersen
parent 2e27f576ab
commit 547e2f7093
2 changed files with 7 additions and 11 deletions
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13
block/scsi_ioctl.c
View File

@ -68,18 +68,9 @@ static int sg_set_timeout(struct request_queue *q, int __user *p)
return err;
}
static int max_sectors_bytes(struct request_queue *q)
{
unsigned int max_sectors = queue_max_sectors(q);
max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
return max_sectors << 9;
}
static int sg_get_reserved_size(struct request_queue *q, int __user *p)
{
int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
int val = min(q->sg_reserved_size, queue_max_bytes(q));
return put_user(val, p);
}
@ -94,7 +85,7 @@ static int sg_set_reserved_size(struct request_queue *q, int __user *p)
if (size < 0)
return -EINVAL;
q->sg_reserved_size = min(size, max_sectors_bytes(q));
q->sg_reserved_size = min_t(unsigned int, size, queue_max_bytes(q));
return 0;
}

5
include/linux/blkdev.h
View File

@ -1373,6 +1373,11 @@ static inline unsigned int queue_max_sectors(const struct request_queue *q)
return q->limits.max_sectors;
}
static inline unsigned int queue_max_bytes(struct request_queue *q)
{
return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;
}
static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
{
return q->limits.max_hw_sectors;