/* $NetBSD: st.c,v 1.35.2.2 1994/10/06 05:09:39 mycroft Exp $ */ /* * Copyright (c) 1994 Charles Hannum. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Charles Hannum. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * Originally written by Julian Elischer (julian@tfs.com) * 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. * * 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 /* Defines for device specific stuff */ #define DEF_FIXED_BSIZE 512 #define ST_RETRIES 4 /* only on non IO commands */ #define STMODE(z) ( minor(z) & 0x03) #define STDSTY(z) ((minor(z) >> 2) & 0x03) #define STUNIT(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_int blksiz; u_int quirks; /* same definitions as in rogues */ char density; char spare[3]; }; struct rogues { char *manu; char *model; char *version; u_int quirks; /* valid for all modes */ u_int page_0_size; #define MAX_PAGE_0_SIZE 64 struct modes modes[4]; }; /* define behaviour codes (quirks) */ #define ST_Q_FORCE_FIXED_MODE 0x00002 #define ST_Q_FORCE_VAR_MODE 0x00004 #define ST_Q_SENSE_HELP 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 */ { {"pre-scsi", " unknown model ", "????", 0, 0, { {512, ST_Q_FORCE_FIXED_MODE, 0}, /* minor 0-3 */ {512, ST_Q_FORCE_FIXED_MODE, QIC_24}, /* minor 4-7 */ {0, ST_Q_FORCE_VAR_MODE, HALFINCH_1600}, /* minor 8-11 */ {0, ST_Q_FORCE_VAR_MODE, HALFINCH_6250} /* minor 12-15 */ } }, {"TANDBERG", " TDC 3600", "????", 0, 12, { {0, 0, 0}, /* minor 0-3 */ {0, ST_Q_FORCE_VAR_MODE, QIC_525}, /* minor 4-7 */ {0, 0, QIC_150}, /* minor 8-11 */ {0, 0, QIC_120} /* minor 12-15 */ } }, /* * At least -005 and -007 need this. I'll assume they all do unless I * hear otherwise. - mycroft, 31MAR1994 */ {"ARCHIVE ", "VIPER 2525 25462", "????", 0, 0, { {0, ST_Q_SENSE_HELP, 0}, /* minor 0-3 */ {0, ST_Q_SENSE_HELP, QIC_525}, /* minor 4-7 */ {0, 0, QIC_150}, /* minor 8-11 */ {0, 0, QIC_120} /* minor 12-15 */ } }, /* * One user reports that this works for his tape drive. It probably * needs more work. - mycroft, 09APR1994 */ {"SANKYO ", "CP525", "????", 0, 0, { {512, ST_Q_FORCE_FIXED_MODE, 0}, /* minor 0-3 */ {512, ST_Q_FORCE_FIXED_MODE, QIC_525}, /* minor 4-7 */ {0, 0, QIC_150}, /* minor 8-11 */ {0, 0, QIC_120} /* minor 12-15 */ } }, {"ARCHIVE ", "VIPER 150", "????", 0, 12, { {0, 0, 0}, /* minor 0-3 */ {0, 0, QIC_150}, /* minor 4-7 */ {0, 0, QIC_120}, /* minor 8-11 */ {0, 0, QIC_24} /* minor 12-15 */ } }, {"WANGTEK ", "5525ES SCSI REV7", "????", 0, 0, { {0, 0, 0}, /* minor 0-3 */ {0, ST_Q_BLKSIZ, QIC_525}, /* minor 4-7 */ {0, 0, QIC_150}, /* minor 8-11 */ {0, 0, QIC_120} /* minor 12-15 */ } }, {"WangDAT ", "Model 1300", "????", 0, 0, { {0, 0, 0}, /* minor 0-3 */ {512, ST_Q_FORCE_FIXED_MODE, DDS}, /* minor 4-7 */ {1024, ST_Q_FORCE_FIXED_MODE, DDS}, /* minor 8-11 */ {0, ST_Q_FORCE_VAR_MODE, DDS} /* minor 12-15 */ } }, #if 0 {"EXABYTE ", "EXB-8200", "????", 0, 5, { {0, 0, 0}, /* minor 0-3 */ {0, 0, 0}, /* minor 4-7 */ {0, 0, 0}, /* minor 8-11 */ {0, 0, 0} /* minor 12-15 */ } }, #endif {0} }; #define NOEJECT 0 #define EJECT 1 struct st_data { struct device sc_dev; /*--------------------present operating parameters, flags etc.----------------*/ int flags; /* see below */ u_int blksiz; /* blksiz we are using */ u_int density; /* present density */ u_int quirks; /* quirks for the open mode */ u_int page_0_size; /* size of page 0 data */ u_int 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_int blkmin; /* min blk size */ u_int blkmax; /* max blk size */ struct rogues *rogues; /* if we have a rogue entry */ /*--------------------parameters reported by the device for this media--------*/ u_int numblks; /* nominal blocks capacity */ u_int media_blksiz; /* 0 if not ST_FIXEDBLOCKS */ u_int media_density; /* this is what it said when asked */ /*--------------------quirks for the whole drive------------------------------*/ u_int 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------------*/ u_char sense_data[MAX_PAGE_0_SIZE]; /* * 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_int xfer_block_wait; /* is a process waiting? */ }; void stattach __P((struct device *, struct device *, void *)); struct cfdriver stcd = { NULL, "st", scsi_targmatch, stattach, DV_TAPE, sizeof(struct st_data) }; int st_space __P((struct st_data *, int number, u_int what, int flags)); int st_rewind __P((struct st_data *, u_int immediate, int flags)); int st_mode_sense __P((struct st_data *, int flags)); int st_decide_mode __P((struct st_data *, boolean first_read)); int st_read_block_limits __P((struct st_data *, int flags)); int st_touch_tape __P((struct st_data *)); int st_write_filemarks __P((struct st_data *, int number, int flags)); int st_load __P((struct st_data *, u_int type, int flags)); int st_mode_select __P((struct st_data *, int flags)); void ststrategy(); void stminphys(); int st_check_eod(); void ststart(); void st_unmount(); int st_mount_tape(); void st_loadquirks(); void st_identify_drive(); int st_interpret_sense(); struct scsi_device st_switch = { st_interpret_sense, ststart, NULL, NULL, "st", 0 }; #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) /* * The routine called by the low level scsi routine when it discovers * A device suitable for this driver */ void stattach(parent, self, aux) struct device *parent, *self; void *aux; { struct st_data *st = (void *)self; struct scsi_link *sc_link = aux; SC_DEBUG(sc_link, SDEV_DB2, ("stattach: ")); sc_link->device = &st_switch; sc_link->dev_unit = st->sc_dev.dv_unit; /* * 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(st); /* * Use the subdriver to request information regarding * the drive. We cannot use interrupts yet, so the * request must specify this. */ printf(": %s", st->rogues ? "rogue, " : ""); if (st_mode_sense(st, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)) printf("drive offline\n"); else if (scsi_test_unit_ready(sc_link, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)) printf("drive empty\n"); else { printf("density code 0x%x, ", st->media_density); if (st->media_blksiz) printf("%d-byte", st->media_blksiz); else printf("variable"); printf(" blocks, write-%s\n", (st->flags & ST_READONLY) ? "protected" : "enabled"); } /* * Set up the buf queue for this device */ st->buf_queue.b_active = 0; st->buf_queue.b_actf = 0; st->buf_queue.b_actb = &st->buf_queue.b_actf; } /* * Use the inquiry routine in 'scsi_base' to get drive info so we can * Further tailor our behaviour. */ void st_identify_drive(st) struct st_data *st; { struct scsi_inquiry_data inqbuf; struct rogues *finger; char manu[32]; char model[32]; char model2[32]; char version[32]; u_int model_len; /* * Get the device type information */ if (scsi_inquire(st->sc_link, &inqbuf, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT) != 0) { printf("%s: couldn't get device type, using default\n", st->sc_dev.dv_xname); 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->manu) { 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)) { st->rogues = finger; st->drive_quirks = finger->quirks; st->quirks = finger->quirks; /* start value */ st->page_0_size = finger->page_0_size; 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. */ int stopen(dev, flags) dev_t dev; int flags; { int unit; u_int mode, dsty; int error = 0; struct st_data *st; struct scsi_link *sc_link; unit = STUNIT(dev); mode = STMODE(dev); dsty = STDSTY(dev); if (unit >= stcd.cd_ndevs) return ENXIO; st = stcd.cd_devs[unit]; if (!st) return ENXIO; sc_link = st->sc_link; SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev, unit, stcd.cd_ndevs)); 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 (error = (scsi_test_unit_ready(sc_link, 0))) { printf("%s: not ready\n", st->sc_dev.dv_xname); st_unmount(st, NOEJECT); return error; } /* * 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(st, 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 */ int stclose(dev) dev_t dev; { int unit, mode; struct st_data *st; struct scsi_link *sc_link; unit = STUNIT(dev); mode = STMODE(dev); st = stcd.cd_devs[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(st, 1, 0); switch (mode & 0x3) { case 0: case 3: /* for now */ st_unmount(st, NOEJECT); break; case 1: /* leave mounted unless media seems to have been removed */ if (!(sc_link->flags & SDEV_MEDIA_LOADED)) st_unmount(st, NOEJECT); break; case 2: st_unmount(st, 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. */ int st_mount_tape(dev, flags) dev_t dev; int flags; { int unit; u_int mode, dsty; struct st_data *st; struct scsi_link *sc_link; int error = 0; unit = STUNIT(dev); mode = STMODE(dev); dsty = STDSTY(dev); st = stcd.cd_devs[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 (error = st_load(st, LD_LOAD, 0)) return error; /* * 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_SENSE_HELP) if (error = st_touch_tape(st)) return error; /* * Load the physical device parameters * loads: blkmin, blkmax */ if (error = st_read_block_limits(st, 0)) return error; /* * 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 (error = st_mode_sense(st, 0)) return error; /* * 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 (error = st_decide_mode(st, FALSE)) return error; } if (error = st_mode_select(st, 0)) { printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); return error; } 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(st, eject) struct st_data *st; boolean eject; { struct scsi_link *sc_link = st->sc_link; int nmarks; if (!(st->flags & ST_MOUNTED)) return; SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); st_check_eod(st, FALSE, &nmarks, SCSI_SILENT); st_rewind(st, 0, SCSI_SILENT); scsi_prevent(sc_link, PR_ALLOW, SCSI_SILENT); if (eject) st_load(st, 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) */ int st_decide_mode(st, first_read) struct st_data *st; boolean first_read; { #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 (st->quirks & (ST_Q_FORCE_FIXED_MODE | ST_Q_FORCE_VAR_MODE)) { case (ST_Q_FORCE_FIXED_MODE | ST_Q_FORCE_VAR_MODE): printf("%s: bad quirks\n", st->sc_dev.dv_xname); 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 (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 (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; { register struct st_data *st = stcd.cd_devs[STUNIT(bp->b_dev)]; (st->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; int unit; int opri; struct st_data *st; unit = STUNIT(bp->b_dev); st = stcd.cd_devs[unit]; SC_DEBUG(st->sc_link, SDEV_DB1, ("ststrategy %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("%s: bad request, must be multiple of %d\n", st->sc_dev.dv_xname, st->blksiz); bp->b_error = EIO; goto bad; } } /* * as are out-of-range requests on variable drives. */ else if (bp->b_bcount < st->blkmin || (st->blkmax && bp->b_bcount > st->blkmax)) { printf("%s: bad request, must be between %d and %d\n", st->sc_dev.dv_xname, st->blkmin, st->blkmax); bp->b_error = EIO; goto bad; } stminphys(bp); opri = splbio(); /* * 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; bp->b_actf = NULL; bp->b_actb = dp->b_actb; *dp->b_actb = bp; dp->b_actb = &bp->b_actf; /* * 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) int unit; { struct st_data *st = stcd.cd_devs[unit]; struct scsi_link *sc_link = st->sc_link; register struct buf *bp, *dp; struct scsi_rw_tape cmd; int 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) { /* 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.b_actf; if (!bp) return; /* no work to bother with */ if (dp = bp->b_actf) dp->b_actb = bp->b_actb; else st->buf_queue.b_actb = bp->b_actb; *bp->b_actb = dp; /* * 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; bp->b_flags |= B_ERROR; bp->b_error = EIO; biodone(bp); continue; } /* * 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(st, 0, SP_FILEMARKS, 0)) { bp->b_flags |= B_ERROR; bp->b_error = EIO; biodone(bp); continue; } } 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; st->flags &= ~ST_FM_WRITTEN; st->flags |= ST_WRITTEN; flags = SCSI_DATA_OUT; } else { cmd.op_code = READ; 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 |= SRW_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_data, bp->b_bcount, 0, 100000, bp, flags | SCSI_NOSLEEP) != SUCCESSFULLY_QUEUED) printf("%s: not queued\n", st->sc_dev.dv_xname); } /* 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 */ int stioctl(dev, cmd, arg, flag) dev_t dev; int cmd; caddr_t arg; int flag; { int error = 0; int unit; int number, nmarks, dsty; int flags; struct st_data *st; u_int hold_blksiz; u_int hold_density; 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 = STDSTY(dev); st = stcd.cd_devs[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_blksiz = st->blksiz; g->mt_density = st->density; g->mt_mblksiz[0] = st->modes[0].blksiz; g->mt_mblksiz[1] = st->modes[1].blksiz; g->mt_mblksiz[2] = st->modes[2].blksiz; g->mt_mblksiz[3] = st->modes[3].blksiz; g->mt_mdensity[0] = st->modes[0].density; g->mt_mdensity[1] = st->modes[1].density; g->mt_mdensity[2] = st->modes[2].density; g->mt_mdensity[3] = st->modes[3].density; 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 */ error = st_write_filemarks(st, number, flags); break; case MTBSF: /* backward space file */ number = -number; case MTFSF: /* forward space file */ error = st_check_eod(st, FALSE, &nmarks, flags); if (!error) error = st_space(st, number - nmarks, SP_FILEMARKS, flags); break; case MTBSR: /* backward space record */ number = -number; case MTFSR: /* forward space record */ error = st_check_eod(st, TRUE, &nmarks, flags); if (!error) error = st_space(st, number, SP_BLKS, flags); break; case MTREW: /* rewind */ error = st_rewind(st, 0, flags); break; case MTOFFL: /* rewind and put the drive offline */ st_unmount(st, EJECT); break; case MTNOP: /* no operation, sets status only */ break; case MTRETEN: /* retension the tape */ error = st_load(st, LD_RETENSION, flags); if (!error) error = st_load(st, LD_LOAD, flags); break; case MTEOM: /* forward space to end of media */ error = st_check_eod(st, FALSE, &nmarks, flags); if (!error) error = st_space(st, 1, SP_EOM, flags); break; 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"); error = EINVAL; break; } #endif if (number == 0) { st->flags &= ~ST_FIXEDBLOCKS; } else { if ((st->blkmin || st->blkmax) && (number < st->blkmin || number > st->blkmax)) { error = 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) error = EINVAL; else st->density = number; goto try_new_value; default: error = EINVAL; } break; } case MTIOCIEOT: case MTIOCEEOT: break; default: if (STMODE(dev) == CTLMODE) error = scsi_do_ioctl(st->sc_link,cmd,arg,flag); else error = ENOTTY; break; } return error; /*-----------------------------*/ 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 (error = st_mode_select(st, 0)) { /* put it back as it was */ printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); st->density = hold_density; st->blksiz = hold_blksiz; if (st->blksiz) st->flags |= ST_FIXEDBLOCKS; else st->flags &= ~ST_FIXEDBLOCKS; return error; } /* * 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 (STMODE(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. */ int st_read(st, buf, size, flags) struct st_data *st; u_int size; int flags; char *buf; { struct scsi_rw_tape cmd; /* * If it's a null transfer, return immediatly */ if (size == 0) return 0; bzero(&cmd, sizeof(cmd)); cmd.op_code = READ; if (st->flags & ST_FIXEDBLOCKS) { cmd.byte2 |= SRW_FIXED; lto3b(size / (st->blksiz ? st->blksiz : DEF_FIXED_BSIZE), cmd.len); } else lto3b(size, cmd.len); return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), (u_char *) buf, size, 0, 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. */ int st_read_block_limits(st, flags) struct st_data *st; int flags; { struct scsi_block_limits cmd; struct scsi_block_limits_data block_limits; struct scsi_link *sc_link = st->sc_link; int error; /* * First check if we have it all loaded */ if ((sc_link->flags & SDEV_MEDIA_LOADED)) return 0; /* * do a 'Read Block Limits' */ bzero(&cmd, sizeof(cmd)); cmd.op_code = READ_BLOCK_LIMITS; /* * do the command, update the global values */ if (error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), (u_char *) &block_limits, sizeof(block_limits), ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN)) return error; st->blkmin = b2tol(block_limits.min_length); st->blkmax = _3btol(&block_limits.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) */ int st_mode_sense(st, flags) struct st_data *st; int flags; { u_int scsi_sense_len; int error; struct scsi_mode_sense cmd; struct scsi_sense { struct scsi_mode_header header; struct blk_desc blk_desc; u_char sense_data[MAX_PAGE_0_SIZE]; } scsi_sense; struct scsi_link *sc_link = st->sc_link; scsi_sense_len = 12 + st->page_0_size; /* * Set up a mode sense */ bzero(&cmd, sizeof(cmd)); cmd.op_code = MODE_SENSE; 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 (error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), (u_char *) &scsi_sense, scsi_sense_len, ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN)) return error; st->numblks = _3btol(scsi_sense.blk_desc.nblocks); st->media_blksiz = _3btol(scsi_sense.blk_desc.blklen); st->media_density = scsi_sense.blk_desc.density; if (scsi_sense.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", scsi_sense.header.dev_spec & SMH_DSP_BUFF_MODE ? "" : "un")); if (st->page_0_size) bcopy(scsi_sense.sense_data, st->sense_data, st->page_0_size); 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. */ int st_mode_select(st, flags) struct st_data *st; int flags; { u_int scsi_select_len; int error; struct scsi_mode_select cmd; struct scsi_select { struct scsi_mode_header header; struct blk_desc blk_desc; u_char sense_data[MAX_PAGE_0_SIZE]; } scsi_select; struct scsi_link *sc_link = st->sc_link; scsi_select_len = 12 + st->page_0_size; /* * Set up for a mode select */ bzero(&cmd, sizeof(cmd)); cmd.op_code = MODE_SELECT; cmd.length = scsi_select_len; bzero(&scsi_select, scsi_select_len); scsi_select.header.blk_desc_len = sizeof(struct blk_desc); scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_ON; scsi_select.blk_desc.density = st->density; if (st->flags & ST_FIXEDBLOCKS) lto3b(st->blksiz, scsi_select.blk_desc.blklen); if (st->page_0_size) bcopy(st->sense_data, scsi_select.sense_data, st->page_0_size); /* * do the command */ return scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), (u_char *) &scsi_select, scsi_select_len, ST_RETRIES, 5000, NULL, flags | SCSI_DATA_OUT); } /* * skip N blocks/filemarks/seq filemarks/eom */ int st_space(st, number, what, flags) struct st_data *st; u_int what; int flags; int number; { struct scsi_space cmd; int error; switch (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(st, 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 discovered 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++; /* XXX dubious */ } break; case SP_EOM: if (st->flags & ST_EIO_PENDING) { /* pretend we just discovered the error */ st->flags &= ~ST_EIO_PENDING; return EIO; } if (st->flags & ST_AT_FILEMARK) st->flags &= ~ST_AT_FILEMARK; break; } if (number == 0) return 0; bzero(&cmd, sizeof(cmd)); cmd.op_code = SPACE; cmd.byte2 = what; lto3b(number, cmd.number); return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), 0, 0, 0, 600000, NULL, flags); } /* * write N filemarks */ int st_write_filemarks(st, number, flags) struct st_data *st; int flags; int number; { struct scsi_write_filemarks cmd; /* * It's hard to write a negative number of file marks. * Don't try. */ if (number < 0) return EINVAL; switch (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(&cmd, sizeof(cmd)); cmd.op_code = WRITE_FILEMARKS; lto3b(number, cmd.number); return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), 0, 0, 0, 100000, 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. */ int st_check_eod(st, position, nmarks, flags) struct st_data *st; boolean position; int *nmarks; int flags; { int error; switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) { default: *nmarks = 0; return 0; 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(st, *nmarks, flags); if (position && !error) error = st_space(st, -*nmarks, SP_FILEMARKS, flags); return error; } /* * load/unload/retension */ int st_load(st, type, flags) struct st_data *st; u_int type; int flags; { struct scsi_load cmd; if (type != LD_LOAD) { int error; int nmarks; error = st_check_eod(st, FALSE, &nmarks, flags); if (error) return error; } if (st->quirks & ST_Q_IGNORE_LOADS) return 0; bzero(&cmd, sizeof(cmd)); cmd.op_code = LOAD; cmd.how = type; return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), 0, 0, ST_RETRIES, 300000, NULL, flags); } /* * Rewind the device */ int st_rewind(st, immediate, flags) struct st_data *st; u_int immediate; int flags; { struct scsi_rewind cmd; int error; int nmarks; error = st_check_eod(st, FALSE, &nmarks, flags); if (error) return error; st->flags &= ~ST_PER_ACTION; bzero(&cmd, sizeof(cmd)); cmd.op_code = REWIND; cmd.byte2 = immediate; return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), 0, 0, ST_RETRIES, immediate ? 5000 : 300000, 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) * (-1 = continue processing) */ int 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; int unit = sc_link->dev_unit; struct st_data *st = stcd.cd_devs[unit]; u_int key; int info; /* * Get the sense fields and work out what code */ if (sense->error_code & SSD_ERRCODE_VALID) { bcopy(&sense->extended_info, &info, sizeof info); info = ntohl(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->extended_flags & SSD_EOM) { st->flags |= ST_EIO_PENDING; if (bp) bp->b_resid = xs->resid; } if (sense->extended_flags & SSD_FILEMARK) { st->flags |= ST_AT_FILEMARK; if (bp) bp->b_resid = xs->resid; } if (sense->extended_flags & SSD_ILI) { st->flags |= ST_EIO_PENDING; if (bp) bp->b_resid = xs->resid; if (sense->error_code & SSD_ERRCODE_VALID && !silent) printf("%s: block wrong size, %d blocks residual\n", st->sc_dev.dv_xname, 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_SENSE_HELP) && !(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; return 0; } } } else { /* must be variable mode */ xs->resid = xs->datalen; /* to be sure */ if (sense->extended_flags & SSD_EOM) return EIO; if (sense->extended_flags & SSD_FILEMARK) { if (bp) bp->b_resid = bp->b_bcount; return 0; } if (sense->extended_flags & SSD_ILI) { if (info < 0) { /* * the record was bigger than the read */ if (!silent) printf("%s: %d-byte record too big\n", st->sc_dev.dv_xname, xs->datalen - info); return EIO; } xs->resid = info; if (bp) bp->b_resid = info; } } key = sense->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_SENSE_HELP) && !(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 0; } } 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. */ int st_touch_tape(st) struct st_data *st; { char *buf; u_int readsiz; int error; buf = malloc(1024, M_TEMP, M_NOWAIT); if (!buf) return ENOMEM; if (error = st_mode_sense(st, 0)) goto bad; st->blksiz = 1024; do { switch (st->blksiz) { case 512: case 1024: readsiz = st->blksiz; st->flags |= ST_FIXEDBLOCKS; break; default: readsiz = 1; st->flags &= ~ST_FIXEDBLOCKS; } if (error = st_mode_select(st, 0)) goto bad; st_read(st, buf, readsiz, SCSI_SILENT); if (error = st_rewind(st, 0, 0)) { bad: free(buf, M_TEMP); return error; } } while (readsiz != 1 && readsiz > st->blksiz); free(buf, M_TEMP); return 0; } int stdump() { /* Not implemented. */ return EINVAL; }