Tested, looks fine to me. (For next == 0, maybe use assignment instead
of bitwise OR in "buf[cnt] |= hex_to_bin(*p++) << 4;"?)
Martin
Dne 16.9.2011 12:38, Nicholas A. Bellinger napsal(a):
From: Nicholas Bellinger<nab@xxxxxxxxxxxxxxx>
This patch adds target_parse_naa_6h_vendor_specific() to address a bug where the
conversion of PRODUCT SERIAL NUMBER to use hex2bin() in target_emulate_evpd_83()
was not doing proper isxdigit() checking. This conversion of the vpd_unit_serial
configifs attribute is done while generating a EVPD=0x83 NAA IEEE Registered
Extended DESIGNATOR format's 100 bits of unique VENDOR SPECIFIC IDENTIFIER +
VENDOR SPECIFIC IDENTIFIER EXTENSION area.
This patch allows vpd_unit_serial (EVPD=0x80) and the T10 Vendor ID DESIGNATOR
format (EVPD=0x83) to continue to use free-form variable length ASCII values,
and now skips any non hex characters for fixed length NAA IEEE Registered Extended
DESIGNATOR format (EVPD=0x83) requring the binary conversion.
This was originally reported by Martin after the v3.1-rc1 change to use hex2bin()
in commit 11650b859681e03fdbf26277fcfc5f1f62186703 where the use of non hex
characters in vpd_unit_serial generated different values than the original
v3.0 internal hex -> binary code. This v3.1 change caused a problem with
filesystems who write a NAA DESIGNATOR onto it's ondisk metadata, and this patch
will (again) change existing values to ensure that non hex characters are not
included in the fixed length NAA DESIGNATOR.
Note this patch still expects vpd_unit_serial to be set via existing userspace
methods of uuid generation, and does not do strict formatting via configfs input.
The original bug report and thread can be found here:
NAA breakage
http://www.spinics.net/lists/target-devel/msg00477.html
The v3.1-rc1 formatting of EVPD=0x83 w/o this patch:
VPD INQUIRY: Device Identification page
Designation descriptor number 1, descriptor length: 20
designator_type: NAA, code_set: Binary
associated with the addressed logical unit
NAA 6, IEEE Company_id: 0x1405
Vendor Specific Identifier: 0xffde35ebf
Vendor Specific Identifier Extension: 0x3092f498ffa820f9
[0x6001405ffde35ebf3092f498ffa820f9]
Designation descriptor number 2, descriptor length: 56
designator_type: T10 vendor identification, code_set: ASCII
associated with the addressed logical unit
vendor id: LIO-ORG
vendor specific: IBLOCK:ffde35ec-3092-4980-a820-917636ca54f1
The v3.1-final formatting of EVPD=0x83 w/ this patch:
VPD INQUIRY: Device Identification page
Designation descriptor number 1, descriptor length: 20
designator_type: NAA, code_set: Binary
associated with the addressed logical unit
NAA 6, IEEE Company_id: 0x1405
Vendor Specific Identifier: 0xffde35ec3
Vendor Specific Identifier Extension: 0x924980a82091763
[0x6001405ffde35ec30924980a82091763]
Designation descriptor number 2, descriptor length: 56
designator_type: T10 vendor identification, code_set: ASCII
associated with the addressed logical unit
vendor id: LIO-ORG
vendor specific: IBLOCK:ffde35ec-3092-4980-a820-917636ca54f1
Reported-by: Martin Svec<martin.svec@xxxxxxxx>
Cc: Martin Svec<martin.svec@xxxxxxxx>
Cc: Douglas Gilbert<dgilbert@xxxxxxxxxxxx>
Cc: James Bottomley<jbottomley@xxxxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger<nab@xxxxxxxxxxxxxxx>
---
drivers/target/target_core_cdb.c | 35 +++++++++++++++++++++++++++++++++--
1 files changed, 33 insertions(+), 2 deletions(-)
diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index 89ae923..08bda0c 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -24,6 +24,7 @@
*/
#include<linux/kernel.h>
+#include<linux/ctype.h>
#include<asm/unaligned.h>
#include<scsi/scsi.h>
@@ -154,6 +155,37 @@ target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
return 0;
}
+static void
+target_parse_naa_6h_vendor_specific(struct se_device *dev, unsigned char *buf_off)
+{
+ unsigned char *p =&dev->se_sub_dev->t10_wwn.unit_serial[0];
+ unsigned char *buf = buf_off;
+ int cnt = 0, next = 1;
+ /*
+ * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
+ * byte 3 bit 4 for NAA IEEE Registered Extended DESIGNATOR field
+ * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
+ * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
+ * NUMBER set via vpd_unit_serial in target_core_configfs.c to to ensure
+ * per device uniqeness.
+ */
+ while (p != NULL) {
+ if (cnt>= 13)
+ break;
+ if (!isxdigit(*p)) {
+ p++;
+ continue;
+ }
+ if (next != 0) {
+ buf[cnt++] |= hex_to_bin(*p++);
+ next = 0;
+ } else {
+ buf[cnt] |= hex_to_bin(*p++)<< 4;
+ next = 1;
+ }
+ }
+}
+
/*
* Device identification VPD, for a complete list of
* DESIGNATOR TYPEs see spc4r17 Table 459.
@@ -219,8 +251,7 @@ target_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
* VENDOR_SPECIFIC_IDENTIFIER and
* VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
*/
- buf[off++] |= hex_to_bin(dev->se_sub_dev->t10_wwn.unit_serial[0]);
- hex2bin(&buf[off],&dev->se_sub_dev->t10_wwn.unit_serial[1], 12);
+ target_parse_naa_6h_vendor_specific(dev,&buf[off]);
len = 20;
off = (len + 4);
--
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