| Message ID | 20200906074018.2370-3-tom.ty89@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2,1/4] scsi: sg: fix BLKSECTGET ioctl | expand |
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index 0e3f084141a3..deeab4855172 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -848,10 +848,11 @@ static int srp_done(Sg_fd *sfp, Sg_request *srp) static int max_sectors_bytes(struct request_queue *q) { unsigned int max_sectors = queue_max_sectors(q); + unsigned int logical_block_size = queue_logical_block_size(q); - max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); + max_sectors = min_t(unsigned int, max_sectors, USHRT_MAX); - return max_sectors << 9; + return max_sectors * logical_block_size; } static void
Logical sector size was never / is no longer necessarily 512. Programatically speaking it may not be necessary for us to clamp max_sectors to USHRT_MAX here, but since such clamping is used in BLKSECTGET, it's probably a good idea to have it here too, so that what the function returns is consistent to what the ioctl reports. Alternatively we can clamp (max_sectors * logical_block_size) to INT_MAX instead, or maybe even not clamping it at all. P.S. sg_reserved_size is initially set to INT_MAX by blk_mq_init_allocated_queue(). Signed-off-by: Tom Yan <tom.ty89@gmail.com> --- drivers/scsi/sg.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)