[SCSI] scsi_debug: reduce duplication between prot_verify_read and prot_verify_write
In order to reduce code duplication between prot_verify_read() and
prot_verify_write(), this moves common code into the new functions.
[jejb: fix unitialised variable warning]
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Acked-by: "Martin K. Petersen" <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index fc8b3aa..3f096a6 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -1710,6 +1710,50 @@
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;
+ }
+ return csum;
+}
+
+static int dif_verify(struct sd_dif_tuple *sdt, const void *data,
+ sector_t sector, u32 ei_lba)
+{
+ u16 csum = dif_compute_csum(data, scsi_debug_sector_size);
+
+ 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)
{
@@ -1725,53 +1769,19 @@
sdt = dif_storep + 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();
- }
-
- 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],
+ fake_storep + sector * scsi_debug_sector_size,
+ 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++;
@@ -1880,7 +1890,6 @@
sector_t tmp_sec = start_sec;
sector_t sector;
int ppage_offset;
- unsigned short csum;
sector = do_div(tmp_sec, sdebug_store_sectors);
@@ -1911,50 +1920,8 @@
sdt = paddr + ppage_offset;
- switch (scsi_debug_guard) {
- case 1:
- csum = ip_compute_csum(daddr + j,
- scsi_debug_sector_size);
- break;
- case 0:
- csum = cpu_to_be16(crc_t10dif(daddr + j,
- 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 + j, 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 + j, scsi_debug_sector_size);
- goto out;
- }
-
- 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, daddr + j, start_sec, ei_lba);
+ if (ret) {
dump_sector(daddr + j, scsi_debug_sector_size);
goto out;
}