[dm-devel] [PATCH v3 03/11] scsi: sd_zbc: Fix sd_zbc_check_zones() error checks
Hannes Reinecke
hare at suse.de
Fri Oct 12 07:35:41 UTC 2018
On 10/12/18 4:30 AM, Damien Le Moal wrote:
> The 32 bits overflow check for the zone size value is already done
> within sd_zbc_check_zones() with the test:
>
> } else if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) {
>
> so there is no need to check again for an out of range value in
> sd_zbc_read_zones(). Simplify the code and fix sd_zbc_check_zones()
> error return to -EFBIG instead of -ENODEV if the zone size is too large.
>
> Signed-off-by: Damien Le Moal <damien.lemoal at wdc.com>
> Reviewed-by: Christoph Hellwig <hch at lst.de>
> ---
> drivers/scsi/sd_zbc.c | 15 ++++++---------
> 1 file changed, 6 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
> index ca73c46931c0..44b64b4a922a 100644
> --- a/drivers/scsi/sd_zbc.c
> +++ b/drivers/scsi/sd_zbc.c
> @@ -373,7 +373,7 @@ static int sd_zbc_check_zoned_characteristics(struct scsi_disk *sdkp,
> * Returns the zone size in number of blocks upon success or an error code
> * upon failure.
> */
> -static s64 sd_zbc_check_zones(struct scsi_disk *sdkp)
> +static s32 sd_zbc_check_zones(struct scsi_disk *sdkp)
> {
> u64 zone_blocks = 0;
> sector_t max_lba, block = 0;
Does this have to be an 's32' ?
Seeing that it's overloaded with an error code, and never sent to any
hardware, can't we just make it a simple 'int' ?
> @@ -472,7 +472,7 @@ static s64 sd_zbc_check_zones(struct scsi_disk *sdkp)
> if (sdkp->first_scan)
> sd_printk(KERN_NOTICE, sdkp,
> "Zone size too large\n");
> - ret = -ENODEV;
> + ret = -EFBIG;
> } else {
> ret = zone_blocks;
> }
> @@ -668,8 +668,7 @@ static int sd_zbc_setup(struct scsi_disk *sdkp, u32 zone_blocks)
>
> int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
> {
> - int64_t zone_blocks;
> - int ret;
> + int ret, zone_blocks;
>
> if (!sd_is_zoned(sdkp))
> /*
> @@ -688,12 +687,10 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
> * an eventual last runt zone) that is a power of 2 are supported.
> */
> zone_blocks = sd_zbc_check_zones(sdkp);
> - ret = -EFBIG;
> - if (zone_blocks != (u32)zone_blocks)
> - goto err;
> - ret = zone_blocks;
> - if (ret < 0)
> + if (zone_blocks < 0) {
> + ret = zone_blocks;
> goto err;
> + }
>
> /* The drive satisfies the kernel restrictions: set it up */
> ret = sd_zbc_setup(sdkp, zone_blocks);
>
Remaining bits are okay.
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare at suse.de +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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