From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Date: Mon, 06 Mar 2006 20:08:16 +0000 Subject: Re: [PATCH] /dev/disk/by-id incomplete and unhelpful for SATA drives Message-Id: <440C96B0.7040404@pobox.com> List-Id: References: <20051221185518.GA9100@vrfy.org> <43A9CFE0.2070103@edesix.com> <20051222043527.GA13175@vrfy.org> <43AA8D0B.10504@edesix.com> <20051222183525.GA17871@devserv.devel.redhat.com> <43AB40E2.1050009@edesix.com> <20060106013640.GA27841@aracnet.com> <43BDDCAE.7000506@torque.net> <43BE6506.7090901@torque.net> In-Reply-To: <43BE6506.7090901@torque.net> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: dougg@torque.net Cc: patman@aracnet.com, Chris Paulson-Ellis , Bill Nottingham , linux-hotplug-devel@lists.sourceforge.net, linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org Douglas Gilbert wrote: > Changelog: > - make existing libata VPD device identification page (0x83) > supply the ATA serial number in the libata "vendor > specific" designator (from Chris Paulson-Ellis) > - add a "t10 vendor id based" designator as defined in > SAT rev 07a (section 10.3.4.2.3) that supplies ATA > model and serial numbers > - make the libata VPD page 0x83 more extensible (for > adding more designators in the future). >=20 > Signed-off-by: Douglas Gilbert > ------------------------------------------------------------------------ >=20 > --- linux/drivers/scsi/libata-scsi.c 2006-01-04 08:50:42.000000000 +1000 > +++ linux/drivers/scsi/libata-scsi.c2615vpd 2006-01-06 20:16:25.000000000= +1000 > @@ -1532,16 +1532,16 @@ > return 0; > } > =20 > -static const char *inq_83_str =3D "Linux ATA-SCSI simulator"; > - > /** > * ata_scsiop_inq_83 - Simulate INQUIRY EVPD page 83, device identity > * @args: device IDENTIFY data / SCSI command of interest. > * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. > * @buflen: Response buffer length. > * > - * Returns device identification. Currently hardcoded to > - * return "Linux ATA-SCSI simulator". > + * Yields two logocal unit device identification designators: > + * - vendor specific ASCII containing the ATA serial number > + * - SAT defined "t10 vendor id based" containing ASCII vendor > + * name ("ATA "), model and serial numbers. > * > * LOCKING: > * spin_lock_irqsave(host_set lock) > @@ -1550,16 +1550,39 @@ > unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf, > unsigned int buflen) > { > + int num; > + const int sat_model_serial_desc_len =3D 68; > + const int ata_model_byte_len =3D 40; > + > rbuf[1] =3D 0x83; /* this page code */ > - rbuf[3] =3D 4 + strlen(inq_83_str); /* page len */ > + num =3D 4; > =20 > - /* our one and only identification descriptor (vendor-specific) */ > - if (buflen > (strlen(inq_83_str) + 4 + 4 - 1)) { > - rbuf[4 + 0] =3D 2; /* code set: ASCII */ > - rbuf[4 + 3] =3D strlen(inq_83_str); > - memcpy(rbuf + 4 + 4, inq_83_str, strlen(inq_83_str)); > + if (buflen > (ATA_SERNO_LEN + num + 3)) { > + /* piv=3D0, assoc=3Dlu, code_set=ACSII, designator=3Dvendor */ > + rbuf[num + 0] =3D 2;=09 > + rbuf[num + 3] =3D ATA_SERNO_LEN; > + num +=3D 4; > + ata_dev_id_string(args->id, (unsigned char *) rbuf + num, > + ATA_ID_SERNO_OFS, ATA_SERNO_LEN); > + num +=3D ATA_SERNO_LEN; > } > - > + if (buflen > (sat_model_serial_desc_len + num + 3)) { > + /* SAT defined lu model and serial numbers descriptor */ > + /* piv=3D0, assoc=3Dlu, code_set=ACSII, designator=3Dt10 vendor id */ > + rbuf[num + 0] =3D 2;=09 > + rbuf[num + 1] =3D 1;=09 > + rbuf[num + 3] =3D sat_model_serial_desc_len; > + num +=3D 4; > + strncpy(rbuf + num, "ATA ", 8); > + num +=3D 8; > + ata_dev_id_string(args->id, (unsigned char *) rbuf + num, > + ATA_ID_PROD_OFS, ata_model_byte_len); > + num +=3D ata_model_byte_len; > + ata_dev_id_string(args->id, (unsigned char *) rbuf + num, > + ATA_ID_SERNO_OFS, ATA_SERNO_LEN); > + num +=3D ATA_SERNO_LEN; > + } > + rbuf[3] =3D num - 4; /* page len (assume less than 256 bytes) */ > return 0; This removes the identifier that has existed since libata was created,=20 which could break something. At the very least, update the existing code to indicate assoc=3Dport, and=20 then append the other descriptor data you wish to add after that. Jeff ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=3Dlnk&kid=110944&bid$1720&dat=121642 _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net Linux-hotplug-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel