/* * Written by Julian Elischer (julian@tfs.com)(now julian@DIALix.oz.au) * for TRW Financial Systems for use under the MACH(2.5) operating system. * * TRW Financial Systems, in accordance with their agreement with Carnegie * Mellon University, makes this software available to CMU to distribute * or use in any manner that they see fit as long as this message is kept with * the software. For this reason TFS also grants any other persons or * organisations permission to use or modify this software. * * TFS supplies this software to be publicly redistributed * on the understanding that TFS is not responsible for the correct * functioning of this software in any circumstances. * * $Id: st.c,v 1.17 1994/08/02 07:52:34 davidg Exp $ */ /* * Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992 * major changes by Julian Elischer (julian@jules.dialix.oz.au) May 1993 */ /* * To do: * work out some better way of guessing what a good timeout is going * to be depending on whether we expect to retension or not. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include u_int32 ststrats, stqueues; /* Defines for device specific stuff */ #define PAGE_0_SENSE_DATA_SIZE 12 #define PAGESIZ 4096 #define DEF_FIXED_BSIZE 512 #define ST_RETRIES 4 /* only on non IO commands */ #define MODE(z) ( (minor(z) & 0x03) ) #define DSTY(z) ( ((minor(z) >> 2) & 0x03) ) #define UNIT(z) ( (minor(z) >> 4) ) #define CTLMODE 3 #define SCSI_2_MAX_DENSITY_CODE 0x17 /* maximum density code specified * in SCSI II spec. */ /* * Define various devices that we know mis-behave in some way, * and note how they are bad, so we can correct for them */ struct modes { u_int32 blksiz; u_int32 quirks; /* same definitions as in rogues */ char density; char spare[3]; }; struct rogues { char *name; char *manu; char *model; char *version; u_int32 quirks; /* valid for all modes */ struct modes modes[4]; }; /* define behaviour codes (quirks) */ #define ST_Q_NEEDS_PAGE_0 0x00001 #define ST_Q_FORCE_FIXED_MODE 0x00002 #define ST_Q_FORCE_VAR_MODE 0x00004 #define ST_Q_SNS_HLP 0x00008 /* must do READ for good MODE SENSE */ #define ST_Q_IGNORE_LOADS 0x00010 #define ST_Q_BLKSIZ 0x00020 /* variable-block media_blksiz > 0 */ static struct rogues gallery[] = /* ends with an all-null entry */ { {"Such an old device ", "pre-scsi", " unknown model ", "????", 0, { {512, ST_Q_FORCE_FIXED_MODE, 0}, /* minor 0,1,2,3 */ {512, ST_Q_FORCE_FIXED_MODE, QIC_24}, /* minor 4,5,6,7 */ {0, ST_Q_FORCE_VAR_MODE, HALFINCH_1600}, /* minor 8,9,10,11 */ {0, ST_Q_FORCE_VAR_MODE, HALFINCH_6250} /* minor 12,13,14,15 */ } }, {"Tandberg tdc3600", "TANDBERG", " TDC 3600", "????", ST_Q_NEEDS_PAGE_0, { {0, 0, 0}, /* minor 0,1,2,3 */ {0, ST_Q_FORCE_VAR_MODE, QIC_525}, /* minor 4,5,6,7 */ {0, 0, QIC_150}, /* minor 8,9,10,11 */ {0, 0, QIC_120} /* minor 12,13,14,15 */ } }, {"Rev 5 of the Archive 2525", "ARCHIVE ", "VIPER 2525 25462", "-005", 0, { {0, ST_Q_SNS_HLP, 0}, /* minor 0,1,2,3 */ {0, ST_Q_SNS_HLP, QIC_525}, /* minor 4,5,6,7 */ {0, 0, QIC_150}, /* minor 8,9,10,11 */ {0, 0, QIC_120} /* minor 12,13,14,15 */ } }, {"Archive Viper 150", "ARCHIVE ", "VIPER 150", "????", ST_Q_NEEDS_PAGE_0, { {0, 0, 0}, /* minor 0,1,2,3 */ {0, 0, QIC_150}, /* minor 4,5,6,7 */ {0, 0, QIC_120}, /* minor 8,9,10,11 */ {0, 0, QIC_24} /* minor 12,13,14,15 */ } }, {"Wangtek 5525ES", "WANGTEK ", "5525ES SCSI REV7", "????", 0, { {0, 0, 0}, /* minor 0,1,2,3 */ {0, ST_Q_BLKSIZ, QIC_525}, /* minor 4,5,6,7 */ {0, 0, QIC_150}, /* minor 8,9,10,11 */ {0, 0, QIC_120} /* minor 12,13,14,15 */ } }, {"WangDAT model 1300", "WangDAT ", "Model 1300", "????", 0, { {0, 0, 0}, /* minor 0,1,2,3 */ {512, ST_Q_FORCE_FIXED_MODE, 0x13}, /* minor 4,5,6,7 */ {1024, ST_Q_FORCE_FIXED_MODE, 0x13}, /* minor 8,9,10,11 */ {0, ST_Q_FORCE_VAR_MODE, 0x13} /* minor 12,13,14,15 */ } }, {(char *) 0} }; errval st_space __P((u_int32 unit, int32 number, u_int32 what, u_int32 flags)); errval st_rewind __P((u_int32 unit, boolean immed, u_int32 flags)); errval st_mode_sense __P((u_int32 unit, u_int32 flags)); errval st_decide_mode __P((u_int32 unit, boolean first_read)); errval st_rd_blk_lim __P((u_int32 unit, u_int32 flags)); errval st_touch_tape __P((u_int32 unit)); errval st_write_filemarks __P((u_int32 unit, int32 number, u_int32 flags)); errval st_load __P((u_int32 unit, u_int32 type, u_int32 flags)); errval st_mode_select __P((u_int32 unit, u_int32 flags)); void ststrategy(); void stminphys(); int32 st_chkeod(); errval stattach(); void ststart(); void st_unmount(); errval st_mount_tape(); void st_loadquirks(); void st_identify_drive(); errval st_interpret_sense(); #define ESUCCESS 0 #define NOEJECT 0 #define EJECT 1 struct scsi_device st_switch = { st_interpret_sense, /* check errors with us first */ ststart, /* we have a queue, and this is how we service it */ NULL, NULL, /* use the default 'done' routine */ "st", 0, { 0, 0 } }; struct st_data { /*--------------------present operating parameters, flags etc.----------------*/ u_int32 flags; /* see below */ u_int32 blksiz; /* blksiz we are using */ u_int32 density; /* present density */ u_int32 quirks; /* quirks for the open mode */ u_int32 last_dsty; /* last density openned */ /*--------------------device/scsi parameters----------------------------------*/ struct scsi_link *sc_link; /* our link to the adpter etc. */ /*--------------------parameters reported by the device ----------------------*/ u_int32 blkmin; /* min blk size */ u_int32 blkmax; /* max blk size */ struct rogues *rogues; /* if we have a rogue entry */ /*--------------------parameters reported by the device for this media--------*/ u_int32 numblks; /* nominal blocks capacity */ u_int32 media_blksiz; /* 0 if not ST_FIXEDBLOCKS */ u_int32 media_density; /* this is what it said when asked */ /*--------------------quirks for the whole drive------------------------------*/ u_int32 drive_quirks; /* quirks of this drive */ /*--------------------How we should set up when openning each minor device----*/ struct modes modes[4]; /* plus more for each mode */ u_int8 modeflags[4]; /* flags for the modes */ #define DENSITY_SET_BY_USER 0x01 #define DENSITY_SET_BY_QUIRK 0x02 #define BLKSIZE_SET_BY_USER 0x04 #define BLKSIZE_SET_BY_QUIRK 0x08 /*--------------------storage for sense data returned by the drive------------*/ unsigned char sense_data[12]; /* * additional sense data needed * for mode sense/select. */ struct buf *buf_queue; /* the queue of pending IO operations */ struct scsi_xfer scsi_xfer; /* scsi xfer struct for this drive */ u_int32 xfer_block_wait; /* is a process waiting? */ } *st_data[NST]; #define ST_INITIALIZED 0x01 #define ST_INFO_VALID 0x02 #define ST_OPEN 0x04 #define ST_BLOCK_SET 0x08 /* block size, mode set by ioctl */ #define ST_WRITTEN 0x10 /* data have been written, EOD needed */ #define ST_FIXEDBLOCKS 0x20 #define ST_AT_FILEMARK 0x40 #define ST_EIO_PENDING 0x80 /* we couldn't report it then (had data) */ #define ST_NEW_MOUNT 0x100 /* still need to decide mode */ #define ST_READONLY 0x200 /* st_mode_sense says write protected */ #define ST_FM_WRITTEN 0x400 /* * EOF file mark written -- used with * ~ST_WRITTEN to indicate that multiple file * marks have been written */ #define ST_BLANK_READ 0x800 /* BLANK CHECK encountered already */ #define ST_2FM_AT_EOD 0x1000 /* write 2 file marks at EOD */ #define ST_MOUNTED 0x2000 /* Device is presently mounted */ #define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ) #define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \ ST_FIXEDBLOCKS | ST_READONLY | \ ST_FM_WRITTEN | ST_2FM_AT_EOD | ST_PER_ACTION) static u_int32 next_st_unit = 0; /* * The routine called by the low level scsi routine when it discovers * A device suitable for this driver */ errval stattach(sc_link) struct scsi_link *sc_link; { u_int32 unit; struct st_data *st; SC_DEBUG(sc_link, SDEV_DB2, ("stattach: ")); /* * Check we have the resources for another drive */ unit = next_st_unit++; if (unit >= NST) { printf("Too many scsi tapes..(%d > %d) reconfigure kernel\n", (unit + 1), NST); return 0; } if (st_data[unit]) { printf("st%d: Already has storage!\n", unit); return 0; } sc_link->device = &st_switch; sc_link->dev_unit = unit; st = st_data[unit] = malloc(sizeof(struct st_data), M_DEVBUF, M_NOWAIT); if (!st) { printf("st%d: malloc failed in st.c\n", unit); return 0; } bzero(st, sizeof(struct st_data)); /* * Store information needed to contact our base driver */ st->sc_link = sc_link; /* * Check if the drive is a known criminal and take * Any steps needed to bring it into line */ st_identify_drive(unit); /* * Use the subdriver to request information regarding * the drive. We cannot use interrupts yet, so the * request must specify this. */ if (st_mode_sense(unit, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)) { printf("st%d: drive offline\n", unit); } else { printf("st%d: density code 0x%x, ", unit, st->media_density); if (!scsi_test_unit_ready(sc_link, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)) { if (st->media_blksiz) { printf("%d-byte", st->media_blksiz); } else { printf("variable"); } printf(" blocks, write-%s\n", (st->flags & ST_READONLY) ? "protected" : "enabled"); } else { printf(" drive empty\n"); } } /* * Set up the buf queue for this device */ st->buf_queue = 0; st->flags |= ST_INITIALIZED; return 0; } /* * Use the inquiry routine in 'scsi_base' to get drive info so we can * Further tailor our behaviour. */ void st_identify_drive(unit) u_int32 unit; { struct st_data *st = st_data[unit]; struct scsi_inquiry_data inqbuf; struct rogues *finger; char manu[32]; char model[32]; char model2[32]; char version[32]; u_int32 model_len; /* * Get the device type information */ if (scsi_inquire(st->sc_link, &inqbuf, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT) != 0) { printf("st%d: couldn't get device type, using default\n", unit); return; } if ((inqbuf.version & SID_ANSII) == 0) { /* * If not advanced enough, use default values */ strncpy(manu, "pre-scsi", 8); manu[8] = 0; strncpy(model, " unknown model ", 16); model[16] = 0; strncpy(version, "????", 4); version[4] = 0; } else { strncpy(manu, inqbuf.vendor, 8); manu[8] = 0; strncpy(model, inqbuf.product, 16); model[16] = 0; strncpy(version, inqbuf.revision, 4); version[4] = 0; } /* * Load the parameters for this kind of device, so we * treat it as appropriate for each operating mode. * Only check the number of characters in the array's * model entry, not the entire model string returned. */ finger = gallery; while (finger->name) { model_len = 0; while (finger->model[model_len] && (model_len < 32)) { model2[model_len] = model[model_len]; model_len++; } model2[model_len] = 0; if ((strcmp(manu, finger->manu) == 0) && (strcmp(model2, finger->model) == 0 || strcmp("????????????????", finger->model) == 0) && (strcmp(version, finger->version) == 0 || strcmp("????", finger->version) == 0)) { printf("st%d: %s is a known rogue\n", unit, finger->name); st->rogues = finger; st->drive_quirks = finger->quirks; st->quirks = finger->quirks; /*start value */ st_loadquirks(st); break; } else { finger++; /* go to next suspect */ } } } /* * initialise the subdevices to the default (QUIRK) state. * this will remove any setting made by the system operator or previous * operations. */ void st_loadquirks(st) struct st_data *st; { int i; struct modes *mode; struct modes *mode2; if (!st->rogues) return; mode = st->rogues->modes; mode2 = st->modes; for (i = 0; i < 4; i++) { bzero(mode2, sizeof(struct modes)); st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK | DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER | DENSITY_SET_BY_USER); if (mode->blksiz && ((mode->quirks | st->drive_quirks) & (ST_Q_FORCE_FIXED_MODE))) { mode2->blksiz = mode->blksiz; st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; } else { if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_VAR_MODE) { mode2->blksiz = 0; st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; } } if (mode->density) { mode2->density = mode->density; st->modeflags[i] |= DENSITY_SET_BY_QUIRK; } mode++; mode2++; } } /* * open the device. */ errval stopen(dev, flags) dev_t dev; u_int32 flags; { u_int32 unit, mode, dsty; errval errno = 0; struct st_data *st; struct scsi_link *sc_link; unit = UNIT(dev); mode = MODE(dev); dsty = DSTY(dev); /* * Check the unit is legal */ if (unit >= NST) { return (ENXIO); } st = st_data[unit]; /* * Make sure the device has been initialised */ if ((st == NULL) || (!(st->flags & ST_INITIALIZED))) return (ENXIO); sc_link = st->sc_link; SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n" ,dev, unit, NST)); /* * Only allow one at a time */ if (st->flags & ST_OPEN) { return (EBUSY); } /* * Throw out a dummy instruction to catch 'Unit attention * errors (the error handling will invalidate all our * device info if we get one, but otherwise, ignore it) */ scsi_test_unit_ready(sc_link, SCSI_SILENT); sc_link->flags |= SDEV_OPEN; /* unit attn are now errors */ /* * If the mode is 3 (e.g. minor = 3,7,11,15) * then the device has been openned to set defaults * This mode does NOT ALLOW I/O, only ioctls */ if (mode == CTLMODE) return 0; /* * Check that the device is ready to use (media loaded?) * This time take notice of the return result */ if (errno = (scsi_test_unit_ready(sc_link, 0))) { printf("st%d: not ready\n", unit); st_unmount(unit, NOEJECT); return (errno); } /* * if it's a different mode, or if the media has been * invalidated, unmount the tape from the previous * session but continue with open processing */ if ((st->last_dsty != dsty) || (!(sc_link->flags & SDEV_MEDIA_LOADED))) { st_unmount(unit, NOEJECT); } /* * If we are not mounted, then we should start a new * mount session. */ if (!(st->flags & ST_MOUNTED)) { st_mount_tape(dev, flags); st->last_dsty = dsty; } /* * Make sure that a tape opened in write-only mode will have * file marks written on it when closed, even if not written to. * This is for SUN compatibility */ if ((flags & O_ACCMODE) == FWRITE) st->flags |= ST_WRITTEN; SC_DEBUG(sc_link, SDEV_DB2, ("Open complete\n")); st->flags |= ST_OPEN; return (0); } /* * close the device.. only called if we are the LAST * occurence of an open device */ errval stclose(dev) dev_t dev; { unsigned char unit, mode; struct st_data *st; struct scsi_link *sc_link; unit = UNIT(dev); mode = MODE(dev); st = st_data[unit]; sc_link = st->sc_link; SC_DEBUG(sc_link, SDEV_DB1, ("closing\n")); if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) st_write_filemarks(unit, 1, 0); switch (mode & 0x3) { case 0: case 3: /* for now */ st_unmount(unit, NOEJECT); break; case 1: /*leave mounted unless media seems to have been removed */ if (!(sc_link->flags & SDEV_MEDIA_LOADED)) { st_unmount(unit, NOEJECT); } break; case 2: st_unmount(unit, EJECT); break; } sc_link->flags &= ~SDEV_OPEN; st->flags &= ~ST_OPEN; return (0); } /* * Start a new mount session. * Copy in all the default parameters from the selected device mode. * and try guess any that seem to be defaulted. */ errval st_mount_tape(dev, flags) dev_t dev; u_int32 flags; { u_int32 unit, mode, dsty; struct st_data *st; struct scsi_link *sc_link; errval errno = 0; unit = UNIT(dev); mode = MODE(dev); dsty = DSTY(dev); st = st_data[unit]; sc_link = st->sc_link; if (st->flags & ST_MOUNTED) return 0; SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n ")); st->flags |= ST_NEW_MOUNT; st->quirks = st->drive_quirks | st->modes[dsty].quirks; /* * If the media is new, then make sure we give it a chance to * to do a 'load' instruction. ( We assume it is new) */ if (errno = st_load(unit, LD_LOAD, 0)) { return (errno); } /* * Throw another dummy instruction to catch * 'Unit attention' errors. Some drives appear to give * these after doing a Load instruction. * (noteably some DAT drives) */ scsi_test_unit_ready(sc_link, SCSI_SILENT); /* * Some devices can't tell you much until they have been * asked to look at the media. This quirk does this. */ if (st->quirks & ST_Q_SNS_HLP) { if (errno = st_touch_tape(unit)) return errno; } /* * Load the physical device parameters * loads: blkmin, blkmax */ if (errno = st_rd_blk_lim(unit, 0)) { return errno; } /* * Load the media dependent parameters * includes: media_blksiz,media_density,numblks * As we have a tape in, it should be reflected here. * If not you may need the "quirk" above. */ if (errno = st_mode_sense(unit, 0)) { return errno; } /* * If we have gained a permanent density from somewhere, * then use it in preference to the one supplied by * default by the driver. */ if (st->modeflags[dsty] & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) { st->density = st->modes[dsty].density; } else { st->density = st->media_density; } /* * If we have gained a permanent blocksize * then use it in preference to the one supplied by * default by the driver. */ st->flags &= ~ST_FIXEDBLOCKS; if (st->modeflags[dsty] & (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) { st->blksiz = st->modes[dsty].blksiz; if (st->blksiz) { st->flags |= ST_FIXEDBLOCKS; } } else { if (errno = st_decide_mode(unit, FALSE)) { return errno; } } if (errno = st_mode_select(unit, 0)) { printf("st%d: Cannot set selected mode", unit); return errno; } scsi_prevent(sc_link, PR_PREVENT, 0); /* who cares if it fails? */ st->flags &= ~ST_NEW_MOUNT; st->flags |= ST_MOUNTED; sc_link->flags |= SDEV_MEDIA_LOADED; /* move earlier? */ return 0; } /* * End the present mount session. * Rewind, and optionally eject the tape. * Reset various flags to indicate that all new * operations require another mount operation */ void st_unmount(int unit, boolean eject) { struct st_data *st = st_data[unit]; struct scsi_link *sc_link = st->sc_link; int32 nmarks; if (!(st->flags & ST_MOUNTED)) return; SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); st_chkeod(unit, FALSE, &nmarks, SCSI_SILENT); st_rewind(unit, FALSE, SCSI_SILENT); scsi_prevent(sc_link, PR_ALLOW, SCSI_SILENT); if (eject) { st_load(unit, LD_UNLOAD, SCSI_SILENT); } st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT); sc_link->flags &= ~SDEV_MEDIA_LOADED; } /* * Given all we know about the device, media, mode, 'quirks' and * initial operation, make a decision as to how we should be set * to run (regarding blocking and EOD marks) */ errval st_decide_mode(unit, first_read) u_int32 unit; boolean first_read; { struct st_data *st = st_data[unit]; #ifdef SCSIDEBUG struct scsi_link *sc_link = st->sc_link; #endif SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n")); /* * If the user hasn't already specified fixed or variable-length * blocks and the block size (zero if variable-length), we'll * have to try to figure them out ourselves. * * Our first shot at a method is, "The quirks made me do it!" */ switch ((int)(st->quirks & (ST_Q_FORCE_FIXED_MODE | ST_Q_FORCE_VAR_MODE))) { case (ST_Q_FORCE_FIXED_MODE | ST_Q_FORCE_VAR_MODE): printf("st%d: bad quirks\n", unit); return (EINVAL); case ST_Q_FORCE_FIXED_MODE: /*specified fixed, but not what size */ st->flags |= ST_FIXEDBLOCKS; if (st->blkmin && (st->blkmin == st->blkmax)) st->blksiz = st->blkmin; else if (st->media_blksiz > 0) st->blksiz = st->media_blksiz; else st->blksiz = DEF_FIXED_BSIZE; SC_DEBUG(sc_link, SDEV_DB3, ("Quirks force fixed mode(%d)\n", st->blksiz)); goto done; case ST_Q_FORCE_VAR_MODE: st->flags &= ~ST_FIXEDBLOCKS; st->blksiz = 0; SC_DEBUG(sc_link, SDEV_DB3, ("Quirks force variable mode\n")); goto done; } /* * If the drive can only handle fixed-length blocks and only at * one size, perhaps we should just do that. */ if (st->blkmin && (st->blkmin == st->blkmax)) { st->flags |= ST_FIXEDBLOCKS; st->blksiz = st->blkmin; SC_DEBUG(sc_link, SDEV_DB3, ("blkmin == blkmax of %d\n", st->blkmin)); goto done; } /* * If the tape density mandates (or even suggests) use of fixed * or variable-length blocks, comply. */ switch ((int)st->density) { case HALFINCH_800: case HALFINCH_1600: case HALFINCH_6250: case DDS: st->flags &= ~ST_FIXEDBLOCKS; st->blksiz = 0; SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n")); goto done; case QIC_11: case QIC_24: case QIC_120: case QIC_150: case QIC_525: case QIC_1320: st->flags |= ST_FIXEDBLOCKS; if (st->media_blksiz > 0) { st->blksiz = st->media_blksiz; } else { st->blksiz = DEF_FIXED_BSIZE; } SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n")); goto done; } /* * If we're about to read the tape, perhaps we should choose * fixed or variable-length blocks and block size according to * what the drive found on the tape. */ if (first_read && (!(st->quirks & ST_Q_BLKSIZ) || (st->media_blksiz == 0) || (st->media_blksiz == DEF_FIXED_BSIZE) || (st->media_blksiz == 1024))) { if (st->media_blksiz == 0) { st->flags &= ~ST_FIXEDBLOCKS; } else { st->flags |= ST_FIXEDBLOCKS; } st->blksiz = st->media_blksiz; SC_DEBUG(sc_link, SDEV_DB3, ("Used media_blksiz of %d\n", st->media_blksiz)); goto done; } /* * We're getting no hints from any direction. Choose variable- * length blocks arbitrarily. */ st->flags &= ~ST_FIXEDBLOCKS; st->blksiz = 0; SC_DEBUG(sc_link, SDEV_DB3, ("Give up and default to variable mode\n")); done: /* * Decide whether or not to write two file marks to signify end- * of-data. Make the decision as a function of density. If * the decision is not to use a second file mark, the SCSI BLANK * CHECK condition code will be recognized as end-of-data when * first read. * (I think this should be a by-product of fixed/variable..julian) */ switch ((int)st->density) { /* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ case QIC_11: case QIC_24: case QIC_120: case QIC_150: case QIC_525: case QIC_1320: st->flags &= ~ST_2FM_AT_EOD; break; default: st->flags |= ST_2FM_AT_EOD; } return 0; } /* * trim the size of the transfer if needed, * called by physio * basically the smaller of our min and the scsi driver's * minphys */ void stminphys(bp) struct buf *bp; { (*(st_data[UNIT(bp->b_dev)]->sc_link->adapter->scsi_minphys)) (bp); } /* * Actually translate the requested transfer into * one the physical driver can understand * The transfer is described by a buf and will include * only one physical transfer. */ void ststrategy(bp) struct buf *bp; { struct buf **dp; unsigned char unit; u_int32 opri; struct st_data *st; ststrats++; unit = UNIT((bp->b_dev)); st = st_data[unit]; SC_DEBUG(st->sc_link, SDEV_DB1, (" strategy: %d bytes @ blk%d\n", bp->b_bcount, bp->b_blkno)); /* * If it's a null transfer, return immediatly */ if (bp->b_bcount == 0) { goto done; } /* * Odd sized request on fixed drives are verboten */ if (st->flags & ST_FIXEDBLOCKS) { if (bp->b_bcount % st->blksiz) { printf("st%d: bad request, must be multiple of %d\n", unit, st->blksiz); bp->b_error = EIO; goto bad; } } /* * as are out-of-range requests on variable drives. */ else if (bp->b_bcount < st->blkmin || bp->b_bcount > st->blkmax) { printf("st%d: bad request, must be between %d and %d\n", unit, st->blkmin, st->blkmax); bp->b_error = EIO; goto bad; } stminphys(bp); opri = splbio(); /* * Use a bounce buffer if necessary */ #ifdef BOUNCE_BUFFERS if (st->sc_link->flags & SDEV_BOUNCE) vm_bounce_alloc(bp); #endif /* * Place it in the queue of activities for this tape * at the end (a bit silly because we only have on user.. * (but it could fork() )) */ dp = &(st->buf_queue); while (*dp) { dp = &((*dp)->b_actf); } *dp = bp; bp->b_actf = NULL; /* * Tell the device to get going on the transfer if it's * not doing anything, otherwise just wait for completion * (All a bit silly if we're only allowing 1 open but..) */ ststart(unit); splx(opri); return; bad: bp->b_flags |= B_ERROR; done: /* * Correctly set the buf to indicate a completed xfer */ iodone(bp); return; } /* * ststart looks to see if there is a buf waiting for the device * and that the device is not already busy. If both are true, * It dequeues the buf and creates a scsi command to perform the * transfer required. The transfer request will call scsi_done * on completion, which will in turn call this routine again * so that the next queued transfer is performed. * The bufs are queued by the strategy routine (ststrategy) * * This routine is also called after other non-queued requests * have been made of the scsi driver, to ensure that the queue * continues to be drained. * ststart() is called at splbio */ void ststart(unit) u_int32 unit; { struct st_data *st = st_data[unit]; struct scsi_link *sc_link = st->sc_link; register struct buf *bp = 0; struct scsi_rw_tape cmd; u_int32 flags; SC_DEBUG(sc_link, SDEV_DB2, ("ststart ")); /* * See if there is a buf to do and we are not already * doing one */ while (sc_link->opennings != 0) { /* if a special awaits, let it proceed first */ if (sc_link->flags & SDEV_WAITING) { sc_link->flags &= ~SDEV_WAITING; wakeup((caddr_t)sc_link); return; } if ((bp = st->buf_queue) == NULL) { return; /* no work to bother with */ } st->buf_queue = bp->b_actf; /* * if the device has been unmounted byt the user * then throw away all requests until done */ if ((!(st->flags & ST_MOUNTED)) || (!(sc_link->flags & SDEV_MEDIA_LOADED))) { /* make sure that one implies the other.. */ sc_link->flags &= ~SDEV_MEDIA_LOADED; goto badnews; } /* * only FIXEDBLOCK devices have pending operations */ if (st->flags & ST_FIXEDBLOCKS) { /* * If we are at a filemark but have not reported it yet * then we should report it now */ if (st->flags & ST_AT_FILEMARK) { if ((bp->b_flags & B_READ) == B_WRITE) { /* * Handling of ST_AT_FILEMARK in * st_space will fill in the right file * mark count. * Back up over filemark */ if (st_space(unit, 0, SP_FILEMARKS, 0) != ESUCCESS) goto badnews; } else { bp->b_resid = bp->b_bcount; bp->b_error = 0; bp->b_flags &= ~B_ERROR; st->flags &= ~ST_AT_FILEMARK; biodone(bp); continue; /* seek more work */ } } /* * If we are at EIO (e.g. EOM) but have not reported it * yet then we should report it now */ if (st->flags & ST_EIO_PENDING) { bp->b_resid = bp->b_bcount; bp->b_error = EIO; bp->b_flags |= B_ERROR; st->flags &= ~ST_EIO_PENDING; biodone(bp); continue; /* seek more work */ } } /* * Fill out the scsi command */ bzero(&cmd, sizeof(cmd)); if ((bp->b_flags & B_READ) == B_WRITE) { cmd.op_code = WRITE_COMMAND_TAPE; st->flags &= ~ST_FM_WRITTEN; st->flags |= ST_WRITTEN; flags = SCSI_DATA_OUT; } else { cmd.op_code = READ_COMMAND_TAPE; flags = SCSI_DATA_IN; } /* * Handle "fixed-block-mode" tape drives by using the * block count instead of the length. */ if (st->flags & ST_FIXEDBLOCKS) { cmd.byte2 |= SRWT_FIXED; lto3b(bp->b_bcount / st->blksiz, cmd.len); } else { lto3b(bp->b_bcount, cmd.len); } /* * go ask the adapter to do all this for us */ if (scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), (u_char *) bp->b_un.b_addr, bp->b_bcount, 0, /* can't retry a read on a tape really */ 100000, bp, flags | SCSI_NOSLEEP) == SUCCESSFULLY_QUEUED) { stqueues++; } else { badnews: printf("st%d: oops not queued\n", unit); bp->b_flags |= B_ERROR; bp->b_error = EIO; biodone(bp); } } /* go back and see if we can cram more work in.. */ } /* * Perform special action on behalf of the user; * knows about the internals of this device */ errval stioctl(dev, cmd, arg, flag) dev_t dev; int cmd; caddr_t arg; int flag; { errval errcode = 0; unsigned char unit; u_int32 number, flags, dsty; struct st_data *st; u_int32 hold_blksiz; u_int32 hold_density; int32 nmarks; struct mtop *mt = (struct mtop *) arg; /* * Find the device that the user is talking about */ flags = 0; /* give error messages, act on errors etc. */ unit = UNIT(dev); dsty = DSTY(dev); st = st_data[unit]; hold_blksiz = st->blksiz; hold_density = st->density; switch (cmd) { case MTIOCGET: { struct mtget *g = (struct mtget *) arg; SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: get status]\n")); bzero(g, sizeof(struct mtget)); g->mt_type = 0x7; /* Ultrix compat *//*? */ g->mt_density = st->density; g->mt_blksiz = st->blksiz; g->mt_density0 = st->modes[0].density; g->mt_density1 = st->modes[1].density; g->mt_density2 = st->modes[2].density; g->mt_density3 = st->modes[3].density; g->mt_blksiz0 = st->modes[0].blksiz; g->mt_blksiz1 = st->modes[1].blksiz; g->mt_blksiz2 = st->modes[2].blksiz; g->mt_blksiz3 = st->modes[3].blksiz; break; } case MTIOCTOP: { SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, mt->mt_count)); /* compat: in U*x it is a short */ number = mt->mt_count; switch ((short) (mt->mt_op)) { case MTWEOF: /* write an end-of-file record */ errcode = st_write_filemarks(unit, number, flags); break; case MTBSF: /* backward space file */ number = -number; case MTFSF: /* forward space file */ errcode = st_chkeod(unit, FALSE, &nmarks, flags); if (errcode == ESUCCESS) errcode = st_space(unit, number - nmarks, SP_FILEMARKS, flags); break; case MTBSR: /* backward space record */ number = -number; case MTFSR: /* forward space record */ errcode = st_chkeod(unit, TRUE, &nmarks, flags); if (errcode == ESUCCESS) errcode = st_space(unit, number, SP_BLKS, flags); break; case MTREW: /* rewind */ errcode = st_rewind(unit, FALSE, flags); break; case MTOFFL: /* rewind and put the drive offline */ st_unmount(unit, EJECT); break; case MTNOP: /* no operation, sets status only */ case MTCACHE: /* enable controller cache */ case MTNOCACHE: /* disable controller cache */ break; case MTSETBSIZ: /* Set block size for device */ #ifdef NOTYET if (!(st->flags & ST_NEW_MOUNT)) { uprintf("re-mount tape before changing blocksize"); errcode = EINVAL; break; } #endif if (number == 0) { st->flags &= ~ST_FIXEDBLOCKS; } else { if ((st->blkmin || st->blkmax) /* they exist */ &&((number < st->blkmin || number > st->blkmax))) { errcode = EINVAL; break; } st->flags |= ST_FIXEDBLOCKS; } st->blksiz = number; st->flags |= ST_BLOCK_SET; /*XXX */ goto try_new_value; case MTSETDNSTY: /* Set density for device and mode */ if (number > SCSI_2_MAX_DENSITY_CODE) { errcode = EINVAL; } else { st->density = number; } goto try_new_value; default: errcode = EINVAL; } break; } case MTIOCIEOT: case MTIOCEEOT: break; default: if(MODE(dev) == CTLMODE) errcode = scsi_do_ioctl(st->sc_link,cmd,arg,flag); else errcode = ENOTTY; break; } return errcode; /*-----------------------------*/ try_new_value: /* * Check that the mode being asked for is aggreeable to the * drive. If not, put it back the way it was. */ if (errcode = st_mode_select(unit, 0)) { /* put it back as it was */ printf("st%d: Cannot set selected mode", unit); st->density = hold_density; st->blksiz = hold_blksiz; if (st->blksiz) { st->flags |= ST_FIXEDBLOCKS; } else { st->flags &= ~ST_FIXEDBLOCKS; } return (errcode); } /* * As the drive liked it, if we are setting a new default, * set it into the structures as such. * * The means for deciding this are not finalised yet */ if (MODE(dev) == 0x03) { /* special mode */ /* XXX */ switch ((short) (mt->mt_op)) { case MTSETBSIZ: st->modes[dsty].blksiz = st->blksiz; st->modeflags[dsty] |= BLKSIZE_SET_BY_USER; break; case MTSETDNSTY: st->modes[dsty].density = st->density; st->modeflags[dsty] |= DENSITY_SET_BY_USER; break; } } return 0; } /* * Do a synchronous read. */ errval st_read(unit, buf, size, flags) u_int32 unit, size, flags; char *buf; { struct scsi_rw_tape scsi_cmd; struct st_data *st = st_data[unit]; /* * If it's a null transfer, return immediatly */ if (size == 0) { return (ESUCCESS); } bzero(&scsi_cmd, sizeof(scsi_cmd)); scsi_cmd.op_code = READ_COMMAND_TAPE; if (st->flags & ST_FIXEDBLOCKS) { scsi_cmd.byte2 |= SRWT_FIXED; lto3b(size / (st->blksiz ? st->blksiz : DEF_FIXED_BSIZE), scsi_cmd.len); } else { lto3b(size, scsi_cmd.len); } return (scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), (u_char *) buf, size, 0, /* not on io commands */ 100000, NULL, flags | SCSI_DATA_IN)); } #ifdef __STDC__ #define b2tol(a) (((unsigned)(a##_1) << 8) + (unsigned)a##_0 ) #else #define b2tol(a) (((unsigned)(a/**/_1) << 8) + (unsigned)a/**/_0 ) #endif /* * Ask the drive what it's min and max blk sizes are. */ errval st_rd_blk_lim(unit, flags) u_int32 unit, flags; { struct scsi_blk_limits scsi_cmd; struct scsi_blk_limits_data scsi_blkl; struct st_data *st = st_data[unit]; errval errno; struct scsi_link *sc_link = st->sc_link; /* * First check if we have it all loaded */ if ((sc_link->flags & SDEV_MEDIA_LOADED)) return 0; /* * do a 'Read Block Limits' */ bzero(&scsi_cmd, sizeof(scsi_cmd)); scsi_cmd.op_code = READ_BLK_LIMITS; /* * do the command, update the global values */ if (errno = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), (u_char *) & scsi_blkl, sizeof(scsi_blkl), ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN)) { return errno; } st->blkmin = b2tol(scsi_blkl.min_length); st->blkmax = _3btol(&scsi_blkl.max_length_2); SC_DEBUG(sc_link, SDEV_DB3, ("(%d <= blksiz <= %d)\n", st->blkmin, st->blkmax)); return 0; } /* * Get the scsi driver to send a full inquiry to the * device and use the results to fill out the global * parameter structure. * * called from: * attach * open * ioctl (to reset original blksize) */ errval st_mode_sense(unit, flags) u_int32 unit, flags; { u_int32 scsi_sense_len; errval errno; char *scsi_sense_ptr; struct scsi_mode_sense scsi_cmd; struct scsi_sense { struct scsi_mode_header header; struct blk_desc blk_desc; } scsi_sense; struct scsi_sense_page_0 { struct scsi_mode_header header; struct blk_desc blk_desc; unsigned char sense_data[PAGE_0_SENSE_DATA_SIZE]; /* Tandberg tape drives returns page 00 * with the sense data, whether or not * you want it( ie the don't like you * saying you want anything less!!!!! * They also expect page 00 * back when you issue a mode select */ } scsi_sense_page_0; struct st_data *st = st_data[unit]; struct scsi_link *sc_link = st->sc_link; /* * Define what sort of structure we're working with */ if (st->quirks & ST_Q_NEEDS_PAGE_0) { scsi_sense_len = sizeof(scsi_sense_page_0); scsi_sense_ptr = (char *) &scsi_sense_page_0; } else { scsi_sense_len = sizeof(scsi_sense); scsi_sense_ptr = (char *) &scsi_sense; } /* * Set up a mode sense */ bzero(&scsi_cmd, sizeof(scsi_cmd)); scsi_cmd.op_code = MODE_SENSE; scsi_cmd.length = scsi_sense_len; /* * do the command, but we don't need the results * just print them for our interest's sake, if asked, * or if we need it as a template for the mode select * store it away. */ if (errno = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), (u_char *) scsi_sense_ptr, scsi_sense_len, ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN)) { return errno; } st->numblks = _3btol(((struct scsi_sense *)scsi_sense_ptr)->blk_desc.nblocks); st->media_blksiz = _3btol(((struct scsi_sense *)scsi_sense_ptr)->blk_desc.blklen); st->media_density = ((struct scsi_sense *) scsi_sense_ptr)->blk_desc.density; if (((struct scsi_sense *) scsi_sense_ptr)->header.dev_spec & SMH_DSP_WRITE_PROT) { st->flags |= ST_READONLY; } SC_DEBUG(sc_link, SDEV_DB3, ("density code 0x%x, %d-byte blocks, write-%s, ", st->media_density, st->media_blksiz, st->flags & ST_READONLY ? "protected" : "enabled")); SC_DEBUG(sc_link, SDEV_DB3, ("%sbuffered\n", ((struct scsi_sense *) scsi_sense_ptr)->header.dev_spec & SMH_DSP_BUFF_MODE ? "" : "un")); if (st->quirks & ST_Q_NEEDS_PAGE_0) { bcopy(((struct scsi_sense_page_0 *) scsi_sense_ptr)->sense_data, st->sense_data, sizeof(((struct scsi_sense_page_0 *) scsi_sense_ptr)->sense_data)); } sc_link->flags |= SDEV_MEDIA_LOADED; return 0; } /* * Send a filled out parameter structure to the drive to * set it into the desire modes etc. */ errval st_mode_select(unit, flags) u_int32 unit, flags; { u_int32 dat_len; char *dat_ptr; struct scsi_mode_select scsi_cmd; struct dat { struct scsi_mode_header header; struct blk_desc blk_desc; } dat; struct dat_page_0 { struct scsi_mode_header header; struct blk_desc blk_desc; unsigned char sense_data[PAGE_0_SENSE_DATA_SIZE]; } dat_page_0; struct st_data *st = st_data[unit]; /* * Define what sort of structure we're working with */ if (st->quirks & ST_Q_NEEDS_PAGE_0) { dat_len = sizeof(dat_page_0); dat_ptr = (char *) &dat_page_0; } else { dat_len = sizeof(dat); dat_ptr = (char *) &dat; } /* * Set up for a mode select */ bzero(dat_ptr, dat_len); bzero(&scsi_cmd, sizeof(scsi_cmd)); scsi_cmd.op_code = MODE_SELECT; scsi_cmd.length = dat_len; ((struct dat *) dat_ptr)->header.blk_desc_len = sizeof(struct blk_desc); ((struct dat *) dat_ptr)->header.dev_spec |= SMH_DSP_BUFF_MODE_ON; ((struct dat *) dat_ptr)->blk_desc.density = st->density; if (st->flags & ST_FIXEDBLOCKS) { lto3b(st->blksiz, ((struct dat *) dat_ptr)->blk_desc.blklen); } if (st->quirks & ST_Q_NEEDS_PAGE_0) { bcopy(st->sense_data, ((struct dat_page_0 *) dat_ptr)->sense_data, sizeof(((struct dat_page_0 *) dat_ptr)->sense_data)); /* the Tandberg tapes need the block size to */ /* be set on each mode sense/select. */ } /* * do the command */ return (scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), (u_char *) dat_ptr, dat_len, ST_RETRIES, 5000, NULL, flags | SCSI_DATA_OUT)); } /* * skip N blocks/filemarks/seq filemarks/eom */ errval st_space(unit, number, what, flags) u_int32 unit, what, flags; int32 number; { errval error; struct scsi_space scsi_cmd; struct st_data *st = st_data[unit]; switch ((int)what) { case SP_BLKS: if (st->flags & ST_PER_ACTION) { if (number > 0) { st->flags &= ~ST_PER_ACTION; return (EIO); } else if (number < 0) { if (st->flags & ST_AT_FILEMARK) { /* * Handling of ST_AT_FILEMARK * in st_space will fill in the * right file mark count. */ error = st_space(unit, 0, SP_FILEMARKS, flags); if (error) return (error); } if (st->flags & ST_BLANK_READ) { st->flags &= ~ST_BLANK_READ; return (EIO); } st->flags &= ~ST_EIO_PENDING; } } break; case SP_FILEMARKS: if (st->flags & ST_EIO_PENDING) { if (number > 0) { /* pretend we just discover the error */ st->flags &= ~ST_EIO_PENDING; return (EIO); } else if (number < 0) { /* back away from the error */ st->flags &= ~ST_EIO_PENDING; } } if (st->flags & ST_AT_FILEMARK) { st->flags &= ~ST_AT_FILEMARK; number--; } if ((st->flags & ST_BLANK_READ) && (number < 0)) { /* back away from unwritten tape */ st->flags &= ~ST_BLANK_READ; number++; /* dubious */ } } if (number == 0) { return (ESUCCESS); } bzero(&scsi_cmd, sizeof(scsi_cmd)); scsi_cmd.op_code = SPACE; scsi_cmd.byte2 = what & SS_CODE; lto3b(number, scsi_cmd.number); return (scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), 0, 0, 0, /* no retries please , just fail */ 600000, /* 10 mins enough? */ NULL, flags)); } /* * write N filemarks */ errval st_write_filemarks(unit, number, flags) u_int32 unit, flags; int32 number; { struct scsi_write_filemarks scsi_cmd; struct st_data *st = st_data[unit]; /* * It's hard to write a negative number of file marks. * Don't try. */ if (number < 0) { return EINVAL; } switch ((int)number) { case 0: /* really a command to sync the drive's buffers */ break; case 1: if (st->flags & ST_FM_WRITTEN) { /* already have one down */ st->flags &= ~ST_WRITTEN; } else { st->flags |= ST_FM_WRITTEN; } st->flags &= ~ST_PER_ACTION; break; default: st->flags &= ~(ST_PER_ACTION | ST_WRITTEN); } bzero(&scsi_cmd, sizeof(scsi_cmd)); scsi_cmd.op_code = WRITE_FILEMARKS; lto3b(number, scsi_cmd.number); return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), 0, 0, 0, /* no retries, just fail */ 100000, /* 10 secs.. (may need to repos head ) */ NULL, flags); } /* * Make sure the right number of file marks is on tape if the * tape has been written. If the position argument is true, * leave the tape positioned where it was originally. * * nmarks returns the number of marks to skip (or, if position * true, which were skipped) to get back original position. */ int32 st_chkeod(unit, position, nmarks, flags) u_int32 unit; boolean position; int32 *nmarks; u_int32 flags; { errval error; struct st_data *st = st_data[unit]; switch ((int)(st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD))) { default: *nmarks = 0; return (ESUCCESS); case ST_WRITTEN: case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD: *nmarks = 1; break; case ST_WRITTEN | ST_2FM_AT_EOD: *nmarks = 2; } error = st_write_filemarks(unit, *nmarks, flags); if (position && (error == ESUCCESS)) error = st_space(unit, -*nmarks, SP_FILEMARKS, flags); return (error); } /* * load/unload (with retension if true) */ errval st_load(unit, type, flags) u_int32 unit, type, flags; { struct scsi_load scsi_cmd; struct st_data *st = st_data[unit]; struct scsi_link *sc_link = st->sc_link; bzero(&scsi_cmd, sizeof(scsi_cmd)); if (type != LD_LOAD) { errval error; int32 nmarks; error = st_chkeod(unit, FALSE, &nmarks, flags); if (error != ESUCCESS) return (error); sc_link->flags &= ~SDEV_MEDIA_LOADED; } if (st->quirks & ST_Q_IGNORE_LOADS) return (0); scsi_cmd.op_code = LOAD_UNLOAD; scsi_cmd.how |= type; return (scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), 0, 0, ST_RETRIES, 300000, /* 5 min */ NULL, flags)); } /* * Rewind the device */ errval st_rewind(unit, immed, flags) u_int32 unit, flags; boolean immed; { struct scsi_rewind scsi_cmd; struct st_data *st = st_data[unit]; errval error; int32 nmarks; error = st_chkeod(unit, FALSE, &nmarks, flags); if (error != ESUCCESS) return (error); st->flags &= ~ST_PER_ACTION; bzero(&scsi_cmd, sizeof(scsi_cmd)); scsi_cmd.op_code = REWIND; scsi_cmd.byte2 = immed ? SR_IMMED : 0; return (scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), 0, 0, ST_RETRIES, immed ? 5000 : 300000, /* 5 sec or 5 min */ NULL, flags)); } #ifdef NETBSD #define SIGNAL_SHORT_READ #else #define SIGNAL_SHORT_READ bp->b_flags |= B_ERROR; #endif /* * Look at the returned sense and act on the error and detirmine * The unix error number to pass back... (0 = report no error) * (-1 = continue processing) */ errval st_interpret_sense(xs) struct scsi_xfer *xs; { struct scsi_link *sc_link = xs->sc_link; struct scsi_sense_data *sense = &(xs->sense); boolean silent = xs->flags & SCSI_SILENT; struct buf *bp = xs->bp; u_int32 unit = sc_link->dev_unit; struct st_data *st = st_data[unit]; u_int32 key; int32 info; /* * Get the sense fields and work out what code */ if (sense->error_code & SSD_ERRCODE_VALID) { info = ntohl(*((int32 *) sense->ext.extended.info)); } else { info = xs->datalen; /* bad choice if fixed blocks */ } if ((sense->error_code & SSD_ERRCODE) != 0x70) { return (-1); /* let the generic code handle it */ } if (st->flags & ST_FIXEDBLOCKS) { xs->resid = info * st->blksiz; if (sense->ext.extended.flags & SSD_EOM) { st->flags |= ST_EIO_PENDING; if (bp) { bp->b_resid = xs->resid; SIGNAL_SHORT_READ } } if (sense->ext.extended.flags & SSD_FILEMARK) { st->flags |= ST_AT_FILEMARK; if (bp) { bp->b_resid = xs->resid; SIGNAL_SHORT_READ } } if (sense->ext.extended.flags & SSD_ILI) { st->flags |= ST_EIO_PENDING; if (bp) { bp->b_resid = xs->resid; SIGNAL_SHORT_READ } if (sense->error_code & SSD_ERRCODE_VALID && !silent) printf("st%d: block wrong size" ", %d blocks residual\n", unit ,info); /* * This quirk code helps the drive read * the first tape block, regardless of * format. That is required for these * drives to return proper MODE SENSE * information. */ if ((st->quirks & ST_Q_SNS_HLP) && !(sc_link->flags & SDEV_MEDIA_LOADED)) { st->blksiz -= 512; } } /* * If no data was tranfered, do it immediatly */ if (xs->resid >= xs->datalen) { if (st->flags & ST_EIO_PENDING) { return EIO; } if (st->flags & ST_AT_FILEMARK) { if (bp) { bp->b_resid = xs->resid; SIGNAL_SHORT_READ } return 0; } } } else { /* must be variable mode */ xs->resid = xs->datalen; /* to be sure */ if (sense->ext.extended.flags & SSD_EOM) { return (EIO); } if (sense->ext.extended.flags & SSD_FILEMARK) { if (bp) bp->b_resid = bp->b_bcount; return 0; } if (sense->ext.extended.flags & SSD_ILI) { if (info < 0) { /* * the record was bigger than the read */ if (!silent) printf("st%d: %d-byte record " "too big\n", unit, xs->datalen - info); return (EIO); } xs->resid = info; if (bp) { bp->b_resid = info; SIGNAL_SHORT_READ } } } key = sense->ext.extended.flags & SSD_KEY; if (key == 0x8) { /* * This quirk code helps the drive read the * first tape block, regardless of format. That * is required for these drives to return proper * MODE SENSE information. */ if ((st->quirks & ST_Q_SNS_HLP) && !(sc_link->flags & SDEV_MEDIA_LOADED)) { /* still starting */ st->blksiz -= 512; } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { st->flags |= ST_BLANK_READ; xs->resid = xs->datalen; if (bp) { bp->b_resid = xs->resid; /*return an EOF */ } return (ESUCCESS); } } return (-1); /* let the default/generic handler handle it */ } /* * The quirk here is that the drive returns some value to st_mode_sense * incorrectly until the tape has actually passed by the head. * * The method is to set the drive to large fixed-block state (user-specified * density and 1024-byte blocks), then read and rewind to get it to sense the * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't * work, as a last resort, try variable- length blocks. The result will be * the ability to do an accurate st_mode_sense. * * We know we can do a rewind because we just did a load, which implies rewind. * Rewind seems preferable to space backward if we have a virgin tape. * * The rest of the code for this quirk is in ILI processing and BLANK CHECK * error processing, both part of st_interpret_sense. */ errval st_touch_tape(unit) u_int32 unit; { struct st_data *st = st_data[unit]; char *buf; u_int32 readsiz; errval errno; buf = malloc(1024, M_TEMP, M_NOWAIT); if (!buf) return (ENOMEM); if (errno = st_mode_sense(unit, 0)) { goto bad; } st->blksiz = 1024; do { switch ((int)st->blksiz) { case 512: case 1024: readsiz = st->blksiz; st->flags |= ST_FIXEDBLOCKS; break; default: readsiz = 1; st->flags &= ~ST_FIXEDBLOCKS; } if (errno = st_mode_select(unit, 0)) { goto bad; } st_read(unit, buf, readsiz, SCSI_SILENT); if (errno = st_rewind(unit, FALSE, 0)) { bad: free(buf, M_TEMP); return (errno); } } while (readsiz != 1 && readsiz > st->blksiz); free(buf, M_TEMP); return 0; }