| Message ID | 20181012023012.29923-4-damien.lemoal@wdc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Zoned block device support improvements | expand |
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@wdc.com> > Reviewed-by: Christoph Hellwig <hch@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
On 2018/10/12 16:35, Hannes Reinecke wrote: > 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@wdc.com> >> Reviewed-by: Christoph Hellwig <hch@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' ? OK. Will do.
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; @@ -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);
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@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> --- drivers/scsi/sd_zbc.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-)