/* * 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 1.71 1996/07/14 10:46:54 joerg 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 "opt_bounce.h" #include "opt_scsi.h" #include #include #include #include #include #include #include #include #include #include #include #include #ifdef DEVFS #include #endif /*DEVFS*/ #include #include #include #include /* Defines for device specific stuff */ #define PAGE_0_SENSE_DATA_SIZE 12 #define DEF_FIXED_BSIZE 512 #define ST_RETRIES 4 /* only on non IO commands */ #define STUNIT(DEV) ((minor(DEV)&0xF0) >> 4) /* 4 bit unit. */ #define STSETUNIT(DEV, U) makedev(major(DEV), ((U) << 4)) #define MODE(z) ( (minor(z) & 0x03) ) #define DSTY(z) ( ((minor(z) >> 2) & 0x03) ) #define CTLMODE 3 #define IS_CTLMODE(DEV) (MODE(DEV) == CTLMODE) static errval st_space __P((u_int32_t unit, int32_t number, u_int32_t what, u_int32_t flags)); static errval st_rewind __P((u_int32_t unit, boolean immed, u_int32_t flags)); static errval st_erase __P((u_int32_t unit, boolean immed, u_int32_t flags)); static errval st_mode_sense __P((u_int32_t unit, u_int32_t flags, \ struct tape_pages *page, u_int32_t pagelen, u_int32_t pagecode)); static errval st_decide_mode __P((u_int32_t unit, boolean first_read)); static errval st_read __P((u_int32_t unit, char *buf, u_int32_t size, u_int32_t flags)); static errval st_rd_blk_lim __P((u_int32_t unit, u_int32_t flags)); static errval st_touch_tape __P((u_int32_t unit)); static errval st_write_filemarks __P((u_int32_t unit, int32_t number, u_int32_t flags)); static errval st_load __P((u_int32_t unit, u_int32_t type, u_int32_t flags)); static errval st_mode_select __P((u_int32_t unit, u_int32_t flags, \ struct tape_pages *page, u_int32_t pagelen)); static errval st_comp __P((u_int32_t unit, u_int32_t mode)); static int32_t st_chkeod __P((u_int32_t unit, boolean position, int32_t *nmarks, u_int32_t flags)); static void ststart(u_int32_t unit, u_int32_t flags); static void st_unmount __P((int unit, boolean eject)); static errval st_mount_tape __P((dev_t dev, u_int32_t flags)); static void st_loadquirks __P((struct scsi_link *sc_link)); static errval st_interpret_sense __P((struct scsi_xfer *xs)); #define ESUCCESS 0 #define NOEJECT 0 #define EJECT 1 struct scsi_data { /*--------------------present operating parameters, flags etc.----------------*/ u_int32_t flags; /* see below */ u_int32_t blksiz; /* blksiz we are using */ u_int32_t density; /* present density */ u_int32_t comp; /* present compression mode */ u_int32_t quirks; /* quirks for the open mode */ u_int32_t last_dsty; /* last density openned */ /*--------------------parameters reported by the device ----------------------*/ u_int32_t blkmin; /* min blk size */ u_int32_t blkmax; /* max blk size */ /*--------------------parameters reported by the device for this media--------*/ u_int32_t numblks; /* nominal blocks capacity */ u_int32_t media_blksiz; /* 0 if not ST_FIXEDBLOCKS */ u_int32_t media_density; /* this is what it said when asked */ /*--------------------quirks for the whole drive------------------------------*/ u_int32_t drive_quirks; /* quirks of this drive */ /*--------------------How we should set up when openning each minor device----*/ st_modes modes; /* plus more for each mode */ u_int8_t 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 #define COMPRES_SET_BY_USER 0x10 #define COMPRES_SET_BY_QUIRK 0x20 /*--------------------storage for sense data returned by the drive------------*/ unsigned char saved_page0[PAGE_0_SENSE_DATA_SIZE]; /* * additional sense data needed * for mode sense/select. */ struct buf_queue_head buf_queue; struct scsi_xfer scsi_xfer; /* scsi xfer struct for this drive */ u_int32_t xfer_block_wait; /* is a process waiting? */ #ifdef DEVFS struct { void *rst; void *nrst; void *erst; /* end of aliases */ void *rst_[4]; void *nrst_[4]; void *erst_[4]; void *ctl_[4]; void *ctl; } devfs_token; #endif }; static int stunit(dev_t dev) { return STUNIT(dev); } static dev_t stsetunit(dev_t dev, int unit) { return STSETUNIT(dev, unit); } static errval st_open(dev_t dev, int flags, int fmt, struct proc *p, struct scsi_link *sc_link); static errval st_ioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p, struct scsi_link *sc_link); static errval st_close(dev_t dev, int flag, int fmt, struct proc *p, struct scsi_link *sc_link); static void st_strategy(struct buf *bp, struct scsi_link *sc_link); static d_open_t stopen; static d_close_t stclose; static d_ioctl_t stioctl; static d_strategy_t ststrategy; #define CDEV_MAJOR 14 #define BDEV_MAJOR 5 static struct cdevsw st_cdevsw; static struct bdevsw st_bdevsw = { stopen, stclose, ststrategy, stioctl, /*5*/ nodump, nopsize, 0, "st", &st_cdevsw, -1 }; SCSI_DEVICE_ENTRIES(st) static 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}, 0, /* Link flags */ stattach, "Sequential-Access", stopen, sizeof(struct scsi_data), T_SEQUENTIAL, stunit, stsetunit, st_open, st_ioctl, st_close, st_strategy, }; #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_SENSE_READ 0x4000 /* mode sense read from drive */ #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 int st_externalize(struct kern_devconf *kdc, struct sysctl_req *req) { return scsi_externalize(SCSI_LINK(&st_switch, kdc->kdc_unit), req); } static struct kern_devconf kdc_st_template = { 0, 0, 0, /* filled in by dev_attach */ "st", 0, MDDC_SCSI, st_externalize, 0, scsi_goaway, SCSI_EXTERNALLEN, &kdc_scbus0, /* XXX parent */ 0, /* parentdata */ DC_UNKNOWN, /* not supported */ }; static inline void st_registerdev(int unit) { struct kern_devconf *kdc; MALLOC(kdc, struct kern_devconf *, sizeof *kdc, M_TEMP, M_NOWAIT); if(!kdc) return; *kdc = kdc_st_template; kdc->kdc_unit = unit; kdc->kdc_description = st_switch.desc; dev_attach(kdc); } /* * The routine called by the low level scsi routine when it discovers * a device suitable for this driver */ static errval stattach(struct scsi_link *sc_link) { u_int32_t unit; #ifdef DEVFS int ii; #endif /*DEVFS*/ struct scsi_data *st = sc_link->sd; unit = sc_link->dev_unit; TAILQ_INIT(&st->buf_queue); /* * Check if the drive is a known criminal and take * Any steps needed to bring it into line */ st_loadquirks(sc_link); /* * 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, NULL, 0, 0)) { printf("drive offline"); } else { printf("density code 0x%lx, ", st->media_density); if (!scsi_test_unit_ready(sc_link, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)) { if (st->media_blksiz) { printf("%ld-byte", st->media_blksiz); } else { printf("variable"); } printf(" blocks, write-%s", (st->flags & ST_READONLY) ? "protected" : "enabled"); } else { printf(" drive empty"); } } /* * Set up the buf queue for this device */ st->flags |= ST_INITIALIZED; st_registerdev(unit); #ifdef DEVFS for(ii=0; ii<4; ii++) { st->devfs_token.rst_[ii] = devfs_add_devswf(&st_cdevsw, (unit << 4 ) + (ii * 4), DV_CHR, UID_ROOT, GID_OPERATOR, 0660, "rst%ld.%d", unit, ii); st->devfs_token.nrst_[ii] = devfs_add_devswf(&st_cdevsw, (unit << 4 ) + ((ii * 4) + 1), DV_CHR, UID_ROOT, GID_OPERATOR, 0660, "nrst%ld.%d", unit, ii); st->devfs_token.erst_[ii] = devfs_add_devswf(&st_cdevsw, (unit << 4 ) + ((ii * 4) + 2), DV_CHR, UID_ROOT, GID_OPERATOR, 0660, "erst%ld.%d", unit, ii); st->devfs_token.ctl_[ii] = devfs_add_devswf(&st_cdevsw, (unit << 4 ) + ((ii * 4) + 3), DV_CHR, UID_ROOT, GID_OPERATOR, 0600, "st%ldctl.%d", unit, ii); } st->devfs_token.ctl = devfs_add_devswf(&st_cdevsw, (unit << 4 ) | SCSI_CONTROL_MASK, DV_CHR, UID_ROOT, GID_WHEEL, 0600, "rst%d.ctl", unit); /** add links **/ st->devfs_token.rst = devfs_link(st->devfs_token.rst_[0], "rst%ld", unit); st->devfs_token.nrst = devfs_link(st->devfs_token.nrst_[0], "nrst%ld", unit); st->devfs_token.erst = devfs_link(st->devfs_token.erst_[0], "erst%ld", unit); #endif return 0; } /* * initialise the subdevices to the default (QUIRK) state. * this will remove any setting made by the system operator or previous * operations. */ static void st_loadquirks(sc_link) struct scsi_link *sc_link; { struct scsi_data *st = sc_link->sd; int i; struct st_mode *mode; struct st_mode *mode2; mode = (struct st_mode*) sc_link->devmodes; if (!mode) return; st->quirks = st->drive_quirks = sc_link->quirks; mode2 = st->modes; for (i = 0; i < 4; i++) { bzero(mode2, sizeof(*mode2)); 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. */ static errval st_open(dev_t dev, int flags, int fmt, struct proc *p, struct scsi_link *sc_link) { u_int32_t unit, mode, dsty; errval errno = 0; struct scsi_data *st; unit = STUNIT(dev); mode = MODE(dev); dsty = DSTY(dev); st = sc_link->sd; /* * Make sure the device has been initialised */ if ((st == NULL) || (!(st->flags & ST_INITIALIZED))) return (ENXIO); /* * 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. * XXX: Where do we lock out I/O? */ if (IS_CTLMODE(dev)) 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)) ) { uprintf("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; scsi_prevent(sc_link, PR_PREVENT, 0); /* who cares if it fails? */ 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 */ static errval st_close(dev_t dev, int flag, int fmt, struct proc *p, struct scsi_link *sc_link) { u_int32_t unit, mode; struct scsi_data *st; unit = STUNIT(dev); mode = MODE(dev); st = sc_link->sd; if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) st_write_filemarks(unit, 1, 0); /* * Since the device has seen its last close, allow media removal. * Do this before we attempt an eject. */ scsi_prevent(sc_link, PR_ALLOW, SCSI_SILENT); 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. */ static errval st_mount_tape(dev, flags) dev_t dev; u_int32_t flags; { u_int32_t unit, mode, dsty; struct scsi_data *st; struct scsi_link *sc_link; errval errno = 0; unit = STUNIT(dev); mode = MODE(dev); dsty = DSTY(dev); sc_link = SCSI_LINK(&st_switch, unit); st = sc_link->sd; 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, NULL, 0, 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, NULL, 0)) ) { printf("st%ld: Cannot set selected mode", unit); return errno; } st->flags &= ~ST_NEW_MOUNT; st->flags |= ST_MOUNTED; sc_link->flags |= SDEV_MEDIA_LOADED; 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 scsi_link *sc_link = SCSI_LINK(&st_switch, unit); struct scsi_data *st = sc_link->sd; int32_t 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); 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) */ static errval st_decide_mode(unit, first_read) u_int32_t unit; boolean first_read; { struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); struct scsi_data *st = sc_link->sd; 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%ld: 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(%ld)\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 %ld\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: case QIC_525: case QIC_1320: case QIC_3080: 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: 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 %ld\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: case QIC_3080: st->flags &= ~ST_2FM_AT_EOD; break; default: st->flags |= ST_2FM_AT_EOD; } return 0; } /* * 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. */ static void st_strategy(struct buf *bp, struct scsi_link *sc_link) { u_int32_t unit; u_int32_t opri; struct scsi_data *st; int len; unit = STUNIT((bp->b_dev)); st = sc_link->sd; /* * If it's a null transfer, return immediatly */ if ((len = bp->b_bcount) == 0) { goto done; } /* * Check the adapter can do it */ scsi_minphys(bp,&st_switch); /* * Odd sized request on fixed drives are verboten */ if (st->flags & ST_FIXEDBLOCKS) { if (bp->b_bcount % st->blksiz) { printf("st%ld: bad request, must be multiple of %ld\n", unit, st->blksiz); bp->b_error = EIO; goto bad; } } /* * as are out-of-range requests on variable drives. * (or if we got chopped by minphys) */ else { if ((bp->b_bcount < st->blkmin || bp->b_bcount > st->blkmax)) { printf("st%ld: bad request, must be between %ld and %ld\n", unit, st->blkmin, st->blkmax); bp->b_error = EIO; goto bad; } if (len != bp->b_bcount) { printf("st%ld: bad request, must be less than %ld bytes\n", unit, bp->b_bcount + 1); bp->b_error = EIO; goto bad; } } opri = splbio(); /* * Use a bounce buffer if necessary */ #ifdef BOUNCE_BUFFERS if (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() )) */ TAILQ_INSERT_TAIL(&st->buf_queue, bp, b_act); /* * 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, 0); splx(opri); return; bad: bp->b_flags |= B_ERROR; done: /* * Correctly set the buf to indicate a completed xfer */ biodone(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 */ static void ststart(unit, flags) u_int32_t unit; u_int32_t flags; { struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); struct scsi_data *st = sc_link->sd; register struct buf *bp = 0; struct scsi_rw_tape cmd; 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; } bp = st->buf_queue.tqh_first; if (bp == NULL) { /* yes, an assign */ return; } TAILQ_REMOVE( &st->buf_queue, bp, b_act); /* * if the device has been unmounted by 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; scsi_uto3b(bp->b_bcount / st->blksiz, cmd.len); } else { scsi_uto3b(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) == SUCCESSFULLY_QUEUED) { } else { badnews: printf("st%ld: 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 */ static errval st_ioctl(dev_t dev, int cmd, caddr_t arg, int flag, struct proc *p, struct scsi_link *sc_link) { errval errcode = 0; u_int32_t unit; u_int32_t number, flags, dsty; struct scsi_data *st; u_int32_t hold_blksiz; u_int32_t hold_density; int32_t 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 = STUNIT(dev); dsty = DSTY(dev); st = sc_link->sd; hold_blksiz = st->blksiz; hold_density = st->density; switch (cmd) { case MTIOCGET: { struct mtget *g = (struct mtget *) arg; SC_DEBUG(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_comp = st->comp; 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; g->mt_comp0 = 0; g->mt_comp1 = 0; g->mt_comp2 = 0; g->mt_comp3 = 0; break; } case MTIOCTOP: { SC_DEBUG(sc_link, SDEV_DB1, ("[ioctl: op=0x%x count=0x%lx]\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 MTEOD: /* space to end of recorded medium */ errcode = st_chkeod(unit, FALSE, &nmarks, flags); if (errcode == ESUCCESS) errcode = st_space(unit, 0, SP_EOM, flags); break; case MTREW: /* rewind */ errcode = st_rewind(unit, FALSE, flags); break; case MTERASE: /* erase */ errcode = st_erase(unit, FALSE, flags); break; case MTRETENS: /* re-tension tape */ errcode = st_load(unit, LD_LOAD|LD_RETEN, flags); break; case MTOFFL: /* rewind and put the drive offline */ /* * Be sure to allow media removal before * attempting the eject. */ scsi_prevent(sc_link, PR_ALLOW, SCSI_SILENT); 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 > (u_int8_t)0xff) { /* Guard against overflows */ errcode = EINVAL; } else { st->density = number; goto try_new_value; } break; case MTCOMP: /* enable default compression */ errcode = st_comp(unit,number); break; default: errcode = EINVAL; } break; } case MTIOCIEOT: case MTIOCEEOT: break; default: if(IS_CTLMODE(dev)) errcode = scsi_do_ioctl(dev, cmd, arg, flag, p, sc_link); 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, NULL, 0)) ) { /* put back as it was */ printf("st%ld: 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 (IS_CTLMODE(dev)) { /* 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. */ static errval st_read(unit, buf, size, flags) u_int32_t unit, size, flags; char *buf; { struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); struct scsi_data *st = sc_link->sd; struct scsi_rw_tape scsi_cmd; /* * 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; scsi_uto3b(size / (st->blksiz ? st->blksiz : DEF_FIXED_BSIZE), scsi_cmd.len); } else { scsi_uto3b(size, scsi_cmd.len); } return (scsi_scsi_cmd(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. */ static errval st_rd_blk_lim(unit, flags) u_int32_t unit, flags; { struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); struct scsi_data *st = sc_link->sd; struct scsi_blk_limits scsi_cmd; struct scsi_blk_limits_data scsi_blkl; errval errno; /* * 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 = scsi_3btou(&scsi_blkl.max_length_2); SC_DEBUG(sc_link, SDEV_DB3, ("(%ld <= blksiz <= %ld)\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) */ static errval st_mode_sense(unit, flags, page, pagelen, pagecode) u_int32_t unit, flags; struct tape_pages *page; u_int32_t pagelen,pagecode; { u_int32_t dat_len; errval errno; struct scsi_mode_sense scsi_cmd; struct { struct scsi_mode_header header; struct blk_desc blk_desc; struct tape_pages page; } dat; /* 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 */ struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); struct scsi_data *st = sc_link->sd; st->flags &= ~ST_SENSE_READ; /* * Check if we need to use a default page.. */ if ((st->quirks & ST_Q_NEEDS_PAGE_0) && (!page)) { pagelen = PAGE_0_SENSE_DATA_SIZE; page = (struct tape_pages *) st->saved_page0; pagecode = 0; } /* * Now work out the total dat size etc. */ dat_len = sizeof(struct scsi_mode_header) + sizeof(struct blk_desc) + (page ? pagelen : 0); /* * Set up a mode sense */ bzero(&scsi_cmd, sizeof(scsi_cmd)); scsi_cmd.op_code = MODE_SENSE; scsi_cmd.page = (u_char) pagecode; scsi_cmd.length = dat_len; /* * do the command, * use the results to set blksiz, numblks and density * 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 *) &dat, dat_len, ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN)) ) { return errno; } st->numblks = scsi_3btou(dat.blk_desc.nblocks); st->media_blksiz = scsi_3btou(dat.blk_desc.blklen); st->media_density = dat.blk_desc.density; if (dat.header.dev_spec & SMH_DSP_WRITE_PROT) { st->flags |= ST_READONLY; } SC_DEBUG(sc_link, SDEV_DB3, ("density code 0x%lx, %ld-byte blocks, write-%s, ", st->media_density, st->media_blksiz, st->flags & ST_READONLY ? "protected" : "enabled")); SC_DEBUG(sc_link, SDEV_DB3, ("%sbuffered\n", ((dat.header.dev_spec & SMH_DSP_BUFF_MODE) ? "" : "un"))); if (page) { bcopy(&dat.page, page, pagelen); } st->flags |= ST_SENSE_READ; return 0; } /* * Send a filled out parameter structure to the drive to * set it into the desire modes etc. */ static errval st_mode_select(unit, flags, page, pagelen) u_int32_t unit, flags; struct tape_pages *page; u_int32_t pagelen; { u_int32_t dat_len; struct scsi_mode_select scsi_cmd; struct { struct scsi_mode_header header; struct blk_desc blk_desc; struct tape_pages page; } dat; struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); struct scsi_data *st = sc_link->sd; /* * Check if we need to use a default page.. * Gee, hope we saved one before now........ */ if ((st->quirks & ST_Q_NEEDS_PAGE_0) && (!page)) { pagelen = PAGE_0_SENSE_DATA_SIZE; page = (struct tape_pages *) st->saved_page0; } /* * Now work out the total dat size etc. */ dat_len = sizeof(struct scsi_mode_header) + sizeof(struct blk_desc) + (page ? pagelen : 0); /* * Set up for a mode select */ bzero(&dat, dat_len); bzero(&scsi_cmd, sizeof(scsi_cmd)); scsi_cmd.op_code = MODE_SELECT; scsi_cmd.length = dat_len; dat.header.blk_desc_len = sizeof(struct blk_desc); dat.header.dev_spec |= SMH_DSP_BUFF_MODE_ON; dat.blk_desc.density = st->density; if (st->flags & ST_FIXEDBLOCKS) { scsi_uto3b(st->blksiz, dat.blk_desc.blklen); } if (page) { bcopy(page, &dat.page, pagelen); /* the Tandberg tapes need the block size to */ /* be set on each mode sense/select. */ } /* * do the command */ return (scsi_scsi_cmd(sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), (u_char *) &dat, dat_len, ST_RETRIES, 5000, NULL, flags | SCSI_DATA_OUT)); } static int noisy_st = 0; /***************************************************************\ * Set the compression mode of the drive to on (1) or off (0) * still doesn't work! grrr! \***************************************************************/ static errval st_comp(unit,mode) u_int32_t unit,mode; { struct tape_pages page; int pagesize; int retval; struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); struct scsi_data *st = sc_link->sd; bzero(&page, sizeof(page)); pagesize = sizeof(page.pages.configuration) + PAGE_HEADERLEN; if ( (retval = st_mode_sense(unit, 0, &page, pagesize, ST_PAGE_CONFIGURATION)) ) { printf("sense returned an error of %d\n",retval); return retval; } if ( noisy_st) printf("drive reports value of %d, setting %ld\n", page.pages.configuration.data_compress_alg,mode); page.pg_code &= ST_P_CODE; page.pg_length = sizeof(page.pages.configuration); switch(mode) { case 0: page.pages.configuration.data_compress_alg = 0; break; case 1: page.pages.configuration.data_compress_alg = 1; break; default: printf("st%ld: bad value for compression mode\n",unit); return EINVAL; } if ( (retval = st_mode_select(unit, 0, &page, pagesize)) ) { printf("select returned an error of %d\n",retval); return retval; } st->comp = mode; return 0; } /* * skip N blocks/filemarks/seq filemarks/eom */ static errval st_space(unit, number, what, flags) u_int32_t unit, what, flags; int32_t number; { errval error; struct scsi_space scsi_cmd; struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); struct scsi_data *st = sc_link->sd; 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 */ } break; case SP_EOM: if (st->flags & ST_EIO_PENDING) { /* we are already at EOM */ st->flags &= ~ST_EIO_PENDING; return(ESUCCESS); } number = 1; /* we have only one end-of-medium */ break; } if (number == 0) { return (ESUCCESS); } bzero(&scsi_cmd, sizeof(scsi_cmd)); scsi_cmd.op_code = SPACE; scsi_cmd.byte2 = what & SS_CODE; scsi_uto3b(number, scsi_cmd.number); return (scsi_scsi_cmd(sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), 0, 0, 0, /* no retries please , just fail */ 3600000, /* wait up to an hour for completion */ NULL, flags)); } /* * write N filemarks */ static errval st_write_filemarks(unit, number, flags) u_int32_t unit, flags; int32_t number; { struct scsi_write_filemarks scsi_cmd; struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); struct scsi_data *st = sc_link->sd; /* * 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; scsi_uto3b(number, scsi_cmd.number); return scsi_scsi_cmd(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. */ static int32_t st_chkeod(unit, position, nmarks, flags) u_int32_t unit; boolean position; int32_t *nmarks; u_int32_t flags; { errval error; struct scsi_data *st = SCSI_DATA(&st_switch, 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) */ static errval st_load(unit, type, flags) u_int32_t unit, type, flags; { struct scsi_load scsi_cmd; struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); struct scsi_data *st = sc_link->sd; bzero(&scsi_cmd, sizeof(scsi_cmd)); if (type != LD_LOAD) { errval error; int32_t 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(sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), 0, 0, ST_RETRIES, 900000, /* 15 min */ NULL, flags)); } /* * Rewind the device */ static errval st_rewind(unit, immed, flags) u_int32_t unit, flags; boolean immed; { struct scsi_rewind scsi_cmd; struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); struct scsi_data *st = sc_link->sd; errval error; int32_t 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(sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), 0, 0, ST_RETRIES, immed ? 5000 : 300000, /* 5 sec or 5 min */ NULL, flags)); } /* ** Erase the device */ static errval st_erase(unit, immed, flags) u_int32_t unit, flags; boolean immed; { struct scsi_erase scsi_cmd; struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); struct scsi_data *st = sc_link->sd; errval error; int32_t nmarks; error = st_chkeod(unit, FALSE, &nmarks, flags); if (error != ESUCCESS) return (error); /* ** Archive Viper 2525 technical manual 5.7 (ERASE 19h): ** tape has to be positioned to BOT first before erase command ** is issued or command is rejected. So we rewind the tape first ** and exit with an error, if the tape can't be rewinded. */ error = st_rewind(unit, FALSE, SCSI_SILENT); if (error != ESUCCESS) return (error); st->flags &= ~ST_PER_ACTION; bzero(&scsi_cmd, sizeof(scsi_cmd)); scsi_cmd.op_code = ERASE; scsi_cmd.byte2 = SE_LONG; /* LONG_ERASE */ scsi_cmd.byte2 += immed ? SE_IMMED : 0; /* immed bit is here the 2nd! */ return (scsi_scsi_cmd(sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), 0, 0, ST_RETRIES, immed ? 5000 : (200 * 60 * 1000), /* 5 sec or 200 min */ NULL, flags)); } /* * Look at the returned sense and act on the error and detirmine * The unix error number to pass back... (0 = report no error) * (SCSIRET_CONTINUE = continue processing) */ static 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; u_int32_t unit = sc_link->dev_unit; struct scsi_data *st = SCSI_DATA(&st_switch, unit); u_int32_t key; int32_t info; /* * Get the sense fields and work out what code */ if (sense->error_code & SSD_ERRCODE_VALID) { info = ntohl(*((int32_t *) sense->ext.extended.info)); } else { if (st->flags & ST_FIXEDBLOCKS) { info = xs->datalen / st->blksiz; } else { info = xs->datalen; } } key = sense->ext.extended.flags & SSD_KEY; if (((sense->error_code & SSD_ERRCODE) != 0x70) || (key == 0x7)) /* Media Write Protected */ { return SCSIRET_CONTINUE;/* let the generic code handle it */ } if(sense->ext.extended.flags & (SSD_EOM|SSD_FILEMARK|SSD_ILI)) { if (st->flags & ST_FIXEDBLOCKS) { xs->resid = info * st->blksiz; xs->flags |= SCSI_RESID_VALID; if (sense->ext.extended.flags & SSD_EOM) { st->flags |= ST_EIO_PENDING; } if (sense->ext.extended.flags & SSD_FILEMARK) { st->flags |= ST_AT_FILEMARK; } if (sense->ext.extended.flags & SSD_ILI) { st->flags |= ST_EIO_PENDING; if (sense->error_code & SSD_ERRCODE_VALID && !silent) printf("st%ld: block wrong size" ", %ld blocks residual\n", unit ,info); /*XXX*/ /* is this how it works ? */ /* check def of ILI for fixed blk tapes */ /* * 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) && !(st->flags & ST_SENSE_READ)) { st->blksiz -= 512; } } /* * If no data was tranfered, do it immediatly */ if (xs->resid >= xs->datalen) { xs->flags &= ~SCSI_RESID_VALID; if (st->flags & ST_AT_FILEMARK) { xs->flags |= SCSI_EOF; st->flags &= ~ST_AT_FILEMARK; return 0; } if (st->flags & ST_EIO_PENDING) { st->flags &= ~ST_EIO_PENDING; return EIO; } } 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) { xs->flags |= SCSI_EOF; } if (sense->ext.extended.flags & SSD_ILI) { if (info < 0) { /* * the record was bigger than the read */ if (!silent) printf("st%ld: %ld-byte record " "too big\n", unit, xs->datalen - info); return (EIO); } xs->resid = info; xs->flags |= SCSI_RESID_VALID; } } return 0; } if (key == 0x8) { xs->flags |= SCSI_EOF; /* some drives need this */ /* * 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) && !(st->flags & ST_SENSE_READ)) { /* still starting */ st->blksiz -= 512; } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { st->flags |= ST_BLANK_READ; xs->flags |= SCSI_EOF; return (ESUCCESS); } } return SCSIRET_CONTINUE; /* Use the the generic handler */ } /* * 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. */ static errval st_touch_tape(unit) u_int32_t unit; { struct scsi_data *st = SCSI_DATA(&st_switch, unit); char *buf; u_int32_t readsiz; errval errno; buf = malloc(1024, M_TEMP, M_NOWAIT); if (!buf) return (ENOMEM); if (( errno = st_mode_sense(unit, 0, NULL, 0, 0)) ) { goto bad; } st->blksiz = (st->quirks & ST_Q_NO_1024)? 512: 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, NULL, 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; } static st_devsw_installed = 0; static void st_drvinit(void *unused) { if( ! st_devsw_installed ) { bdevsw_add_generic(BDEV_MAJOR, CDEV_MAJOR, &st_bdevsw); st_devsw_installed = 1; } } SYSINIT(stdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,st_drvinit,NULL)