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[SCSI] sg: cap reserved_size values at max_sectors

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This patch (as857) modifies the SG_GET_RESERVED_SIZE and
SG_SET_RESERVED_SIZE ioctls in the sg driver, capping the values at
the device's request_queue's max_sectors value.  This will permit
cdrecord to obtain a legal value for the maximum transfer length,
fixing Bugzilla #7026.

The patch also caps the initial reserved_size value.  There's no
reason to have a reserved buffer larger than max_sectors, since it
would be impossible to use the extra space.

The corresponding ioctls in the block layer are modified similarly,
and the initial value for the reserved_size is set as large as
possible.  This will effectively make it default to max_sectors.
Note that the actual value is meaningless anyway, since block devices
don't have a reserved buffer.

Finally, the BLKSECTGET ioctl is added to sg, so that there will be a
uniform way for users to determine the actual max_sectors value for
any raw SCSI transport.

Signed-off-by: Alan Stern <[email protected]>
Acked-by: Jens Axboe <[email protected]>
Acked-by: Douglas Gilbert <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
This commit is contained in:
Alan Stern 2007-02-20 11:01:57 -05:00 • committed by James Bottomley
commit 44ec95425c
3 changed files with 16 additions and 3 deletions
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2
block/ll_rw_blk.c
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@ -1925,6 +1925,8 @@ blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id)
blk_queue_max_hw_segments(q, MAX_HW_SEGMENTS);
blk_queue_max_phys_segments(q, MAX_PHYS_SEGMENTS);
q->sg_reserved_size = INT_MAX;
/*
* all done
*/

4
block/scsi_ioctl.c
View file

@ -78,7 +78,9 @@ static int sg_set_timeout(request_queue_t *q, int __user *p)
static int sg_get_reserved_size(request_queue_t *q, int __user *p)
{
return put_user(q->sg_reserved_size, p);
unsigned val = min(q->sg_reserved_size, q->max_sectors << 9);
return put_user(val, p);
}
static int sg_set_reserved_size(request_queue_t *q, int __user *p)