In order to reduce code duplication between prot_verify_read() and prot_verify_write(), this moves common code into the new functions. Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx> Cc: "James E.J. Bottomley" <JBottomley@xxxxxxxxxxxxx> Cc: Douglas Gilbert <dgilbert@xxxxxxxxxxxx> Cc: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx> Cc: linux-scsi@xxxxxxxxxxxxxxx --- * New patch from v2 drivers/scsi/scsi_debug.c | 135 +++++++++++++++++++--------------------------- 1 file changed, 54 insertions(+), 81 deletions(-) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 152ead6..bd14e12 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -1710,6 +1710,50 @@ static int do_device_access(struct scsi_cmnd *scmd, return ret; } +static u16 dif_compute_csum(const void *buf, int len) +{ + u16 csum; + + switch (scsi_debug_guard) { + case 1: + csum = ip_compute_csum(buf, len); + break; + case 0: + csum = cpu_to_be16(crc_t10dif(buf, len)); + break; + default: + BUG(); + } + return csum; +} + +static int dif_verify(struct sd_dif_tuple *sdt, u16 csum, sector_t sector, + u32 ei_lba) +{ + if (sdt->guard_tag != csum) { + pr_err("%s: GUARD check failed on sector %lu rcvd 0x%04x, data 0x%04x\n", + __func__, + (unsigned long)sector, + be16_to_cpu(sdt->guard_tag), + be16_to_cpu(csum)); + return 0x01; + } + if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION && + be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { + pr_err("%s: REF check failed on sector %lu\n", + __func__, (unsigned long)sector); + return 0x03; + } + if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION && + be32_to_cpu(sdt->ref_tag) != ei_lba) { + pr_err("%s: REF check failed on sector %lu\n", + __func__, (unsigned long)sector); + dif_errors++; + return 0x03; + } + return 0; +} + static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec, unsigned int sectors, u32 ei_lba) { @@ -1726,52 +1770,21 @@ static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec, for (i = 0 ; i < sectors ; i++) { u16 csum; + int ret; if (sdt[i].app_tag == 0xffff) continue; sector = start_sec + i; - switch (scsi_debug_guard) { - case 1: - csum = ip_compute_csum(fake_storep + - sector * scsi_debug_sector_size, - scsi_debug_sector_size); - break; - case 0: - csum = crc_t10dif(fake_storep + - sector * scsi_debug_sector_size, - scsi_debug_sector_size); - csum = cpu_to_be16(csum); - break; - default: - BUG(); - } + csum = dif_compute_csum(fake_storep + + sector * scsi_debug_sector_size, + scsi_debug_sector_size); - if (sdt[i].guard_tag != csum) { - printk(KERN_ERR "%s: GUARD check failed on sector %lu" \ - " rcvd 0x%04x, data 0x%04x\n", __func__, - (unsigned long)sector, - be16_to_cpu(sdt[i].guard_tag), - be16_to_cpu(csum)); + ret = dif_verify(&sdt[i], csum, sector, ei_lba); + if (ret) { dif_errors++; - return 0x01; - } - - if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION && - be32_to_cpu(sdt[i].ref_tag) != (sector & 0xffffffff)) { - printk(KERN_ERR "%s: REF check failed on sector %lu\n", - __func__, (unsigned long)sector); - dif_errors++; - return 0x03; - } - - if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION && - be32_to_cpu(sdt[i].ref_tag) != ei_lba) { - printk(KERN_ERR "%s: REF check failed on sector %lu\n", - __func__, (unsigned long)sector); - dif_errors++; - return 0x03; + return ret; } ei_lba++; @@ -1911,50 +1924,10 @@ static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec, sdt = paddr + ppage_offset; - switch (scsi_debug_guard) { - case 1: - csum = ip_compute_csum(daddr, - scsi_debug_sector_size); - break; - case 0: - csum = cpu_to_be16(crc_t10dif(daddr, - scsi_debug_sector_size)); - break; - default: - BUG(); - ret = 0; - goto out; - } - - if (sdt->guard_tag != csum) { - printk(KERN_ERR - "%s: GUARD check failed on sector %lu " \ - "rcvd 0x%04x, calculated 0x%04x\n", - __func__, (unsigned long)sector, - be16_to_cpu(sdt->guard_tag), - be16_to_cpu(csum)); - ret = 0x01; - dump_sector(daddr, scsi_debug_sector_size); - goto out; - } - - if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION && - be32_to_cpu(sdt->ref_tag) - != (start_sec & 0xffffffff)) { - printk(KERN_ERR - "%s: REF check failed on sector %lu\n", - __func__, (unsigned long)sector); - ret = 0x03; - dump_sector(daddr, scsi_debug_sector_size); - goto out; - } + csum = dif_compute_csum(daddr, scsi_debug_sector_size); - if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION && - be32_to_cpu(sdt->ref_tag) != ei_lba) { - printk(KERN_ERR - "%s: REF check failed on sector %lu\n", - __func__, (unsigned long)sector); - ret = 0x03; + ret = dif_verify(sdt, csum, start_sec, ei_lba); + if (ret) { dump_sector(daddr, scsi_debug_sector_size); goto out; } -- 1.8.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html