/* $OpenBSD: st.c,v 1.190 2023/04/27 18:21:44 robert Exp $ */ /* $NetBSD: st.c,v 1.71 1997/02/21 23:03:49 thorpej 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 #include #include #include /* Defines for device specific stuff */ #define DEF_FIXED_BSIZE 512 #define STMODE(z) ( minor(z) & 0x03) #define STUNIT(z) ((minor(z) >> 4) ) #define STMINOR(unit, mode) (((unit) << 4) + (mode)) #define MAXSTMODES 16 /* Old max retained so minor's don't change. */ #define ST_IO_TIME (3 * 60 * 1000) /* 3 minutes */ #define ST_CTL_TIME (30 * 1000) /* 30 seconds */ #define ST_SPC_TIME (4 * 60 * 60 * 1000) /* 4 hours */ /* * Maximum density code allowed in SCSI spec (SSC2R08f, Section 8.3). */ #define SCSI_MAX_DENSITY_CODE 0xff /* * Define various devices that we know mis-behave in some way, * and note how they are bad, so we can correct for them */ struct mode { int blksize; u_int8_t density; }; struct quirkdata { u_int quirks; #define ST_Q_SENSE_HELP 0x0001 /* must do READ for good MODE SENSE */ #define ST_Q_IGNORE_LOADS 0x0002 #define ST_Q_UNIMODAL 0x0004 /* unimode drive rejects mode select */ struct mode mode; }; struct st_quirk_inquiry_pattern { struct scsi_inquiry_pattern pattern; struct quirkdata quirkdata; }; const struct st_quirk_inquiry_pattern st_quirk_patterns[] = { {{T_SEQUENTIAL, T_REMOV, " ", " ", " "}, {0, {512, 0}}}, {{T_SEQUENTIAL, T_REMOV, "TANDBERG", " TDC 3800 ", ""}, {0, {512, 0}}}, {{T_SEQUENTIAL, T_REMOV, "ARCHIVE ", "VIPER 2525 25462", ""}, {ST_Q_SENSE_HELP, {0, 0}}}, {{T_SEQUENTIAL, T_REMOV, "SANKYO ", "CP525 ", ""}, {0, {512, 0}}}, {{T_SEQUENTIAL, T_REMOV, "ANRITSU ", "DMT780 ", ""}, {0, {512, 0}}}, {{T_SEQUENTIAL, T_REMOV, "ARCHIVE ", "VIPER 150 21531", ""}, {ST_Q_SENSE_HELP, {0, 0}}}, {{T_SEQUENTIAL, T_REMOV, "WANGTEK ", "5099ES SCSI", ""}, {0, {512, 0}}}, {{T_SEQUENTIAL, T_REMOV, "WANGTEK ", "5150ES SCSI", ""}, {0, {512, 0}}}, {{T_SEQUENTIAL, T_REMOV, "HP ", "T4000s ", ""}, {ST_Q_UNIMODAL, {0, QIC_3095}}}, {{T_SEQUENTIAL, T_REMOV, "WANGTEK ", "5150ES SCSI FA15", "01 A"}, {ST_Q_IGNORE_LOADS, {0, 0}}}, {{T_SEQUENTIAL, T_REMOV, "TEAC ", "MT-2ST/N50 ", ""}, {ST_Q_IGNORE_LOADS, {0, 0}}}, }; #define NOEJECT 0 #define EJECT 1 #define NOREWIND 0 #define DOREWIND 1 struct st_softc { struct device sc_dev; struct disk sc_dk; int flags; #define ST_INFO_VALID 0x00000001 #define ST_WRITTEN 0x00000004 #define ST_FIXEDBLOCKS 0x00000008 #define ST_AT_FILEMARK 0x00000010 #define ST_EIO_PENDING 0x00000020 #define ST_EOM_PENDING 0x00000040 #define ST_EOD_DETECTED 0x00000080 #define ST_FM_WRITTEN 0x00000100 #define ST_BLANK_READ 0x00000200 #define ST_2FM_AT_EOD 0x00000400 #define ST_MOUNTED 0x00000800 #define ST_DONTBUFFER 0x00001000 #define ST_DYING 0x00004000 #define ST_BOD_DETECTED 0x00008000 #define ST_MODE_DENSITY 0x00010000 #define ST_MODE_BLKSIZE 0x00040000 u_int quirks; /* quirks for the open mode */ int blksize; /* blksize we are using */ u_int8_t density; /* present density */ short mt_resid; /* last (short) resid */ short mt_erreg; /* last error (sense key) seen */ struct scsi_link *sc_link; /* our link to the adapter etc. */ int blkmin; /* min blk size */ int blkmax; /* max blk size */ u_int32_t media_blksize; /* 0 if not ST_FIXEDBLOCKS */ u_int32_t media_density; /* this is what it said when asked */ int media_fileno; /* relative to BOT. -1 means unknown. */ int media_blkno; /* relative to BOF. -1 means unknown. */ int media_eom; /* relative to BOT. -1 means unknown. */ struct mode mode; struct bufq sc_bufq; struct scsi_xshandler sc_xsh; }; int stmatch(struct device *, void *, void *); void stattach(struct device *, struct device *, void *); int stactivate(struct device *, int); int stdetach(struct device *, int); void stminphys(struct buf *); void ststart(struct scsi_xfer *); int st_mount_tape(struct st_softc *, int); void st_unmount(struct st_softc *, int, int); int st_decide_mode(struct st_softc *, int); void st_buf_done(struct scsi_xfer *); int st_read(struct st_softc *, char *, int, int); int st_read_block_limits(struct st_softc *, int); int st_mode_sense(struct st_softc *, int); int st_mode_select(struct st_softc *, int); int st_space(struct st_softc *, int, u_int, int); int st_write_filemarks(struct st_softc *, int, int); int st_check_eod(struct st_softc *, int, int *, int); int st_load(struct st_softc *, u_int, int); int st_rewind(struct st_softc *, u_int, int); int st_interpret_sense(struct scsi_xfer *); int st_touch_tape(struct st_softc *); int st_erase(struct st_softc *, int, int); const struct cfattach st_ca = { sizeof(struct st_softc), stmatch, stattach, stdetach, stactivate }; struct cfdriver st_cd = { NULL, "st", DV_TAPE }; #define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_EOM_PENDING | \ ST_BLANK_READ) #define stlookup(unit) (struct st_softc *)device_lookup(&st_cd, (unit)) const struct scsi_inquiry_pattern st_patterns[] = { {T_SEQUENTIAL, T_REMOV, "", "", ""}, }; int stmatch(struct device *parent, void *match, void *aux) { struct scsi_attach_args *sa = aux; struct scsi_inquiry_data *inq = &sa->sa_sc_link->inqdata; int priority; (void)scsi_inqmatch(inq, st_patterns, nitems(st_patterns), sizeof(st_patterns[0]), &priority); return priority; } /* * The routine called by the low level scsi routine when it discovers * a device suitable for this driver. */ void stattach(struct device *parent, struct device *self, void *aux) { const struct st_quirk_inquiry_pattern *finger; struct st_softc *st = (void *)self; struct scsi_attach_args *sa = aux; struct scsi_link *link = sa->sa_sc_link; int priority; SC_DEBUG(link, SDEV_DB2, ("stattach:\n")); /* * Store information needed to contact our base driver */ st->sc_link = link; link->interpret_sense = st_interpret_sense; link->device_softc = st; /* Get any quirks and mode information. */ finger = (const struct st_quirk_inquiry_pattern *)scsi_inqmatch( &link->inqdata, st_quirk_patterns, nitems(st_quirk_patterns), sizeof(st_quirk_patterns[0]), &priority); if (finger != NULL) { st->quirks = finger->quirkdata.quirks; st->mode = finger->quirkdata.mode; CLR(st->flags, ST_MODE_BLKSIZE | ST_MODE_DENSITY); if (st->mode.blksize != 0) SET(st->flags, ST_MODE_BLKSIZE); if (st->mode.density != 0) SET(st->flags, ST_MODE_DENSITY); } printf("\n"); scsi_xsh_set(&st->sc_xsh, link, ststart); st->sc_dk.dk_name = st->sc_dev.dv_xname; /* Set up the buf queue for this device. */ bufq_init(&st->sc_bufq, BUFQ_FIFO); /* Start up with media position unknown. */ st->media_fileno = -1; st->media_blkno = -1; st->media_eom = -1; /* * Reset the media loaded flag, sometimes the data * acquired at boot time is not quite accurate. This * will be checked again at the first open. */ CLR(link->flags, SDEV_MEDIA_LOADED); st->sc_dk.dk_flags = DKF_NOLABELREAD; disk_attach(&st->sc_dev, &st->sc_dk); } int stactivate(struct device *self, int act) { struct st_softc *st = (struct st_softc *)self; switch (act) { case DVACT_DEACTIVATE: SET(st->flags, ST_DYING); scsi_xsh_del(&st->sc_xsh); break; } return 0; } int stdetach(struct device *self, int flags) { struct st_softc *st = (struct st_softc *)self; int cmaj, mn; bufq_drain(&st->sc_bufq); /* Locate the lowest minor number to be detached. */ mn = STMINOR(self->dv_unit, 0); for (cmaj = 0; cmaj < nchrdev; cmaj++) if (cdevsw[cmaj].d_open == stopen) vdevgone(cmaj, mn, mn + MAXSTMODES - 1, VCHR); bufq_destroy(&st->sc_bufq); disk_detach(&st->sc_dk); return 0; } /* * open the device. */ int stopen(dev_t dev, int flags, int fmt, struct proc *p) { struct scsi_link *link; struct st_softc *st; int error = 0; st = stlookup(STUNIT(dev)); if (st == NULL) return ENXIO; if (ISSET(st->flags, ST_DYING)) { device_unref(&st->sc_dev); return ENXIO; } link = st->sc_link; if ((error = disk_lock(&st->sc_dk)) != 0) { device_unref(&st->sc_dev); return error; } if (ISSET(flags, FWRITE) && ISSET(link->flags, SDEV_READONLY)) { error = EACCES; goto done; } SC_DEBUG(link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev, STUNIT(dev), st_cd.cd_ndevs)); /* * Tape is an exclusive media. Only one open at a time. */ if (ISSET(link->flags, SDEV_OPEN)) { SC_DEBUG(link, SDEV_DB4, ("already open\n")); error = EBUSY; goto done; } /* Use st_interpret_sense() now. */ SET(link->flags, SDEV_OPEN); /* * Check the unit status. This clears any outstanding errors and * will ensure that media is present. */ error = scsi_test_unit_ready(link, TEST_READY_RETRIES, SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE | SCSI_IGNORE_ILLEGAL_REQUEST); /* * Terminate any existing mount session if there is no media. */ if (!ISSET(link->flags, SDEV_MEDIA_LOADED)) st_unmount(st, NOEJECT, DOREWIND); if (error != 0) { CLR(link->flags, SDEV_OPEN); goto done; } error = st_mount_tape(st, flags); if (error != 0) { CLR(link->flags, SDEV_OPEN); goto done; } /* * 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) SET(st->flags, ST_WRITTEN); done: SC_DEBUG(link, SDEV_DB2, ("open complete\n")); disk_unlock(&st->sc_dk); device_unref(&st->sc_dev); return error; } /* * close the device.. only called if we are the LAST * occurrence of an open device */ int stclose(dev_t dev, int flags, int mode, struct proc *p) { struct scsi_link *link; struct st_softc *st; int error = 0; st = stlookup(STUNIT(dev)); if (st == NULL) return ENXIO; if (ISSET(st->flags, ST_DYING)) { error = ENXIO; goto done; } link = st->sc_link; disk_lock_nointr(&st->sc_dk); SC_DEBUG(link, SDEV_DB1, ("closing\n")); if (ISSET(st->flags, ST_WRITTEN) && !ISSET(st->flags, ST_FM_WRITTEN)) st_write_filemarks(st, 1, 0); switch (STMODE(dev)) { case 0: /* /dev/rstN */ st_unmount(st, NOEJECT, DOREWIND); break; case 1: /* /dev/nrstN */ st_unmount(st, NOEJECT, NOREWIND); break; case 2: /* /dev/erstN */ st_unmount(st, EJECT, DOREWIND); break; case 3: /* /dev/enrstN */ st_unmount(st, EJECT, NOREWIND); break; } CLR(link->flags, SDEV_OPEN); scsi_xsh_del(&st->sc_xsh); disk_unlock(&st->sc_dk); done: device_unref(&st->sc_dev); return error; } /* * Start a new mount session if needed. */ int st_mount_tape(struct st_softc *st, int flags) { struct scsi_link *link = st->sc_link; int error = 0; if (ISSET(st->flags, ST_MOUNTED)) return 0; SC_DEBUG(link, SDEV_DB1, ("mounting\n")); /* * Assume the media is new and give it a chance to * to do a 'load' instruction. */ if ((error = st_load(st, LD_LOAD, 0)) != 0) goto done; /* * Throw another dummy instruction to catch * 'Unit attention' errors. Some drives appear to give * these after doing a Load instruction. * (notably some DAT drives) */ /* XXX */ scsi_test_unit_ready(link, TEST_READY_RETRIES, SCSI_SILENT); /* * Some devices can't tell you much until they have been * asked to look at the media. This quirk does this. */ if (ISSET(st->quirks, ST_Q_SENSE_HELP)) if ((error = st_touch_tape(st)) != 0) return error; /* * Load the physical device parameters * loads: blkmin, blkmax */ if (!ISSET(link->flags, SDEV_ATAPI) && (error = st_read_block_limits(st, 0)) != 0) goto done; /* * Load the media dependent parameters * includes: media_blksize,media_density * 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)) != 0) goto done; /* * If we have gained a permanent density from somewhere, * then use it in preference to the one supplied by * default by the driver. */ if (ISSET(st->flags, ST_MODE_DENSITY)) st->density = st->mode.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. */ CLR(st->flags, ST_FIXEDBLOCKS); if (ISSET(st->flags, ST_MODE_BLKSIZE)) { st->blksize = st->mode.blksize; if (st->blksize) SET(st->flags, ST_FIXEDBLOCKS); } else { if ((error = st_decide_mode(st, 0)) != 0) goto done; } if ((error = st_mode_select(st, 0)) != 0) { printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); goto done; } scsi_prevent(link, PR_PREVENT, SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); SET(st->flags, ST_MOUNTED); SET(link->flags, SDEV_MEDIA_LOADED); /* move earlier? */ st->media_fileno = 0; st->media_blkno = 0; st->media_eom = -1; done: return error; } /* * 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(struct st_softc *st, int eject, int rewind) { struct scsi_link *link = st->sc_link; int nmarks; if (eject == NOEJECT && rewind == NOREWIND) { if (ISSET(link->flags, SDEV_MEDIA_LOADED)) return; } st->media_fileno = -1; st->media_blkno = -1; if (!ISSET(st->flags, ST_MOUNTED)) return; SC_DEBUG(link, SDEV_DB1, ("unmounting\n")); st_check_eod(st, 0, &nmarks, SCSI_IGNORE_NOT_READY); if (rewind == DOREWIND) st_rewind(st, 0, SCSI_IGNORE_NOT_READY); scsi_prevent(link, PR_ALLOW, SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); if (eject == EJECT) st_load(st, LD_UNLOAD, SCSI_IGNORE_NOT_READY); CLR(st->flags, ST_MOUNTED); CLR(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(struct st_softc *st, int first_read) { struct scsi_link *link = st->sc_link; SC_DEBUG(link, SDEV_DB2, ("starting block mode decision\n")); /* ATAPI tapes are always fixed blocksize. */ if (ISSET(link->flags, SDEV_ATAPI)) { SET(st->flags, ST_FIXEDBLOCKS); if (st->media_blksize > 0) st->blksize = st->media_blksize; else st->blksize = DEF_FIXED_BSIZE; 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)) { SET(st->flags, ST_FIXEDBLOCKS); st->blksize = st->blkmin; SC_DEBUG(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: CLR(st->flags, ST_FIXEDBLOCKS); st->blksize = 0; SC_DEBUG(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: SET(st->flags, ST_FIXEDBLOCKS); if (st->media_blksize > 0) st->blksize = st->media_blksize; else st->blksize = DEF_FIXED_BSIZE; SC_DEBUG(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) { if (st->media_blksize > 0) SET(st->flags, ST_FIXEDBLOCKS); else CLR(st->flags, ST_FIXEDBLOCKS); st->blksize = st->media_blksize; SC_DEBUG(link, SDEV_DB3, ("Used media_blksize of %d\n", st->media_blksize)); goto done; } /* * We're getting no hints from any direction. Choose variable- * length blocks arbitrarily. */ CLR(st->flags, ST_FIXEDBLOCKS); st->blksize = 0; SC_DEBUG(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: CLR(st->flags, ST_2FM_AT_EOD); break; default: SET(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. */ void ststrategy(struct buf *bp) { struct scsi_link *link; struct st_softc *st; int s; st = stlookup(STUNIT(bp->b_dev)); if (st == NULL) { bp->b_error = ENXIO; goto bad; } if (ISSET(st->flags, ST_DYING)) { bp->b_error = ENXIO; goto bad; } link = st->sc_link; SC_DEBUG(link, SDEV_DB2, ("ststrategy: %ld bytes @ blk %lld\n", bp->b_bcount, (long long)bp->b_blkno)); /* * If it's a null transfer, return immediately. */ if (bp->b_bcount == 0) goto done; /* * Odd sized request on fixed drives are verboten */ if (ISSET(st->flags, ST_FIXEDBLOCKS)) { if (bp->b_bcount % st->blksize) { printf("%s: bad request, must be multiple of %d\n", st->sc_dev.dv_xname, st->blksize); 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; } /* * 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())) */ bufq_queue(&st->sc_bufq, bp); /* * 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..) */ scsi_xsh_add(&st->sc_xsh); device_unref(&st->sc_dev); return; bad: SET(bp->b_flags, B_ERROR); done: /* Set b_resid to indicate no xfer was done. */ bp->b_resid = bp->b_bcount; s = splbio(); biodone(bp); splx(s); if (st) device_unref(&st->sc_dev); } void ststart(struct scsi_xfer *xs) { struct scsi_link *link = xs->sc_link; struct st_softc *st = link->device_softc; struct buf *bp; struct scsi_rw_tape *cmd; int s; SC_DEBUG(link, SDEV_DB2, ("ststart\n")); if (ISSET(st->flags, ST_DYING)) { scsi_xs_put(xs); return; } /* * if the device has been unmounted by the user * then throw away all requests until done */ if (!ISSET(st->flags, ST_MOUNTED) || !ISSET(link->flags, SDEV_MEDIA_LOADED)) { /* make sure that one implies the other.. */ CLR(link->flags, SDEV_MEDIA_LOADED); bufq_drain(&st->sc_bufq); scsi_xs_put(xs); return; } for (;;) { bp = bufq_dequeue(&st->sc_bufq); if (bp == NULL) { scsi_xs_put(xs); return; } /* * Only FIXEDBLOCK devices have pending I/O or space * operations. */ if (ISSET(st->flags, ST_FIXEDBLOCKS)) { /* * If we are at a filemark but have not reported it yet * then we should report it now */ if (ISSET(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)) { SET(bp->b_flags, B_ERROR); bp->b_resid = bp->b_bcount; bp->b_error = EIO; s = splbio(); biodone(bp); splx(s); continue; } } else { bp->b_resid = bp->b_bcount; bp->b_error = 0; CLR(bp->b_flags, B_ERROR); CLR(st->flags, ST_AT_FILEMARK); s = splbio(); biodone(bp); splx(s); continue; /* seek more work */ } } } /* * If we are at EIO or EOM but have not reported it * yet then we should report it now. */ if (ISSET(st->flags, ST_EOM_PENDING | ST_EIO_PENDING)) { bp->b_resid = bp->b_bcount; if (ISSET(st->flags, ST_EIO_PENDING)) { bp->b_error = EIO; SET(bp->b_flags, B_ERROR); } CLR(st->flags, ST_EOM_PENDING | ST_EIO_PENDING); s = splbio(); biodone(bp); splx(s); continue; /* seek more work */ } break; } /* * Fill out the scsi command */ cmd = (struct scsi_rw_tape *)&xs->cmd; bzero(cmd, sizeof(*cmd)); if ((bp->b_flags & B_READ) == B_WRITE) { cmd->opcode = WRITE; CLR(st->flags, ST_FM_WRITTEN); SET(st->flags, ST_WRITTEN); SET(xs->flags, SCSI_DATA_OUT); } else { cmd->opcode = READ; SET(xs->flags, SCSI_DATA_IN); } /* * Handle "fixed-block-mode" tape drives by using the * block count instead of the length. */ if (ISSET(st->flags, ST_FIXEDBLOCKS)) { SET(cmd->byte2, SRW_FIXED); _lto3b(bp->b_bcount / st->blksize, cmd->len); } else _lto3b(bp->b_bcount, cmd->len); if (st->media_blkno != -1) { /* Update block count now, errors will set it to -1. */ if (ISSET(st->flags, ST_FIXEDBLOCKS)) st->media_blkno += _3btol(cmd->len); else if (_3btol(cmd->len) != 0) st->media_blkno++; } xs->cmdlen = sizeof(*cmd); xs->timeout = ST_IO_TIME; xs->data = bp->b_data; xs->datalen = bp->b_bcount; xs->done = st_buf_done; xs->cookie = bp; xs->bp = bp; /* Instrumentation. */ disk_busy(&st->sc_dk); /* * go ask the adapter to do all this for us */ scsi_xs_exec(xs); /* * should we try do more work now? */ if (bufq_peek(&st->sc_bufq)) scsi_xsh_add(&st->sc_xsh); } void st_buf_done(struct scsi_xfer *xs) { struct st_softc *st = xs->sc_link->device_softc; struct buf *bp = xs->cookie; int error, s; switch (xs->error) { case XS_NOERROR: bp->b_error = 0; CLR(bp->b_flags, B_ERROR); bp->b_resid = xs->resid; break; case XS_SENSE: case XS_SHORTSENSE: SC_DEBUG_SENSE(xs); error = st_interpret_sense(xs); if (error == 0) { bp->b_error = 0; CLR(bp->b_flags, B_ERROR); bp->b_resid = xs->resid; break; } if (error != ERESTART) xs->retries = 0; goto retry; case XS_BUSY: if (xs->retries) { if (scsi_delay(xs, 1) != ERESTART) xs->retries = 0; } goto retry; case XS_TIMEOUT: retry: if (xs->retries--) { scsi_xs_exec(xs); return; } /* FALLTHROUGH */ default: bp->b_error = EIO; SET(bp->b_flags, B_ERROR); bp->b_resid = bp->b_bcount; break; } disk_unbusy(&st->sc_dk, bp->b_bcount - xs->resid, bp->b_blkno, bp->b_flags & B_READ); s = splbio(); biodone(bp); splx(s); scsi_xs_put(xs); } void stminphys(struct buf *bp) { struct scsi_link *link; struct st_softc *sc; sc = stlookup(STUNIT(bp->b_dev)); if (sc == NULL) return; link = sc->sc_link; if (link->bus->sb_adapter->dev_minphys != NULL) (*link->bus->sb_adapter->dev_minphys)(bp, link); else minphys(bp); device_unref(&sc->sc_dev); } int stread(dev_t dev, struct uio *uio, int iomode) { return physio(ststrategy, dev, B_READ, stminphys, uio); } int stwrite(dev_t dev, struct uio *uio, int iomode) { return physio(ststrategy, dev, B_WRITE, stminphys, uio); } /* * Perform special action on behalf of the user; * knows about the internals of this device */ int stioctl(dev_t dev, u_long cmd, caddr_t arg, int flag, struct proc *p) { int error = 0; int nmarks; int flags = 0; struct st_softc *st; int hold_blksize; u_int8_t hold_density; struct mtop *mt = (struct mtop *) arg; int number; /* * Find the device that the user is talking about */ st = stlookup(STUNIT(dev)); if (st == NULL) return ENXIO; if (ISSET(st->flags, ST_DYING)) { error = ENXIO; goto done; } hold_blksize = st->blksize; hold_density = st->density; switch (cmd) { case MTIOCGET: { struct mtget *g = (struct mtget *) arg; /* * (to get the current state of READONLY) */ error = st_mode_sense(st, SCSI_SILENT); if (error != 0) break; 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->blksize; g->mt_density = st->density; g->mt_mblksiz = st->mode.blksize; g->mt_mdensity = st->mode.density; if (ISSET(st->sc_link->flags, SDEV_READONLY)) SET(g->mt_dsreg, MT_DS_RDONLY); if (ISSET(st->flags, ST_MOUNTED)) SET(g->mt_dsreg, MT_DS_MOUNTED); g->mt_resid = st->mt_resid; g->mt_erreg = st->mt_erreg; g->mt_fileno = st->media_fileno; g->mt_blkno = st->media_blkno; /* * clear latched errors. */ st->mt_resid = 0; st->mt_erreg = 0; break; } case MTIOCTOP: { SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, mt->mt_count)); number = mt->mt_count; switch (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, 0, &nmarks, flags); if (error == 0) 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, 1, &nmarks, flags); if (error == 0) 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, DOREWIND); break; case MTNOP: /* no operation, sets status only */ break; case MTRETEN: /* retension the tape */ error = st_load(st, LD_RETENSION, flags); if (error == 0) error = st_load(st, LD_LOAD, flags); break; case MTEOM: /* forward space to end of media */ error = st_check_eod(st, 0, &nmarks, flags); if (error == 0) error = st_space(st, 1, SP_EOM, flags); break; case MTCACHE: /* enable controller cache */ CLR(st->flags, ST_DONTBUFFER); goto try_new_value; case MTNOCACHE: /* disable controller cache */ SET(st->flags, ST_DONTBUFFER); goto try_new_value; case MTERASE: /* erase volume */ error = st_erase(st, number, flags); break; case MTSETBSIZ: /* Set block size for device and mode. */ if (number == 0) { CLR(st->flags, ST_FIXEDBLOCKS); } else { if ((st->blkmin || st->blkmax) && (number < st->blkmin || number > st->blkmax)) { error = EINVAL; break; } SET(st->flags, ST_FIXEDBLOCKS); } st->blksize = number; goto try_new_value; case MTSETDNSTY: /* Set density for device and mode. */ if (number < 0 || number > SCSI_MAX_DENSITY_CODE) { error = EINVAL; break; } st->density = number; goto try_new_value; default: error = EINVAL; } break; } case MTIOCIEOT: case MTIOCEEOT: break; #if 0 case MTIOCRDSPOS: error = st_rdpos(st, 0, (u_int32_t *) arg); break; case MTIOCRDHPOS: error = st_rdpos(st, 1, (u_int32_t *) arg); break; case MTIOCSLOCATE: error = st_setpos(st, 0, (u_int32_t *) arg); break; case MTIOCHLOCATE: error = st_setpos(st, 1, (u_int32_t *) arg); break; #endif /* 0 */ default: error = scsi_do_ioctl(st->sc_link, cmd, arg, flag); break; } goto done; 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)) != 0) {/* put it back as it was */ printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); st->density = hold_density; st->blksize = hold_blksize; if (st->blksize) SET(st->flags, ST_FIXEDBLOCKS); else CLR(st->flags, ST_FIXEDBLOCKS); goto done; } /* * As the drive liked it, if we are setting a new default, * set it into the structures as such. */ switch (mt->mt_op) { case MTSETBSIZ: st->mode.blksize = st->blksize; SET(st->flags, ST_MODE_BLKSIZE); break; case MTSETDNSTY: st->mode.density = st->density; SET(st->flags, ST_MODE_DENSITY); break; } done: device_unref(&st->sc_dev); return error; } /* * Do a synchronous read. */ int st_read(struct st_softc *st, char *buf, int size, int flags) { struct scsi_rw_tape *cmd; struct scsi_xfer *xs; int error; if (size == 0) return 0; xs = scsi_xs_get(st->sc_link, flags | SCSI_DATA_IN); if (xs == NULL) return ENOMEM; xs->cmdlen = sizeof(*cmd); xs->data = buf; xs->datalen = size; xs->retries = 0; xs->timeout = ST_IO_TIME; cmd = (struct scsi_rw_tape *)&xs->cmd; cmd->opcode = READ; if (ISSET(st->flags, ST_FIXEDBLOCKS)) { SET(cmd->byte2, SRW_FIXED); _lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE), cmd->len); } else _lto3b(size, cmd->len); error = scsi_xs_sync(xs); scsi_xs_put(xs); return error; } /* * Ask the drive what its min and max blk sizes are. */ int st_read_block_limits(struct st_softc *st, int flags) { struct scsi_block_limits_data *block_limits = NULL; struct scsi_block_limits *cmd; struct scsi_link *link = st->sc_link; struct scsi_xfer *xs; int error = 0; if (ISSET(link->flags, SDEV_MEDIA_LOADED)) return 0; block_limits = dma_alloc(sizeof(*block_limits), PR_NOWAIT); if (block_limits == NULL) return ENOMEM; xs = scsi_xs_get(link, flags | SCSI_DATA_IN); if (xs == NULL) { error = ENOMEM; goto done; } xs->cmdlen = sizeof(*cmd); xs->data = (void *)block_limits; xs->datalen = sizeof(*block_limits); xs->timeout = ST_CTL_TIME; cmd = (struct scsi_block_limits *)&xs->cmd; cmd->opcode = READ_BLOCK_LIMITS; error = scsi_xs_sync(xs); scsi_xs_put(xs); if (error == 0) { st->blkmin = _2btol(block_limits->min_length); st->blkmax = _3btol(block_limits->max_length); SC_DEBUG(link, SDEV_DB3, ("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax)); } done: if (block_limits) dma_free(block_limits, sizeof(*block_limits)); return error; } /* * 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(struct st_softc *st, int flags) { union scsi_mode_sense_buf *data = NULL; struct scsi_link *link = st->sc_link; u_int64_t block_count; u_int32_t density, block_size; u_char *page0 = NULL; u_int8_t dev_spec; int error = 0, big; data = dma_alloc(sizeof(*data), PR_NOWAIT); if (data == NULL) return ENOMEM; /* * Ask for page 0 (vendor specific) mode sense data. */ density = 0; block_count = 0; block_size = 0; error = scsi_do_mode_sense(link, 0, data, (void **)&page0, 1, flags | SCSI_SILENT, &big); if (error != 0) goto done; scsi_parse_blkdesc(link, data, big, &density, &block_count, &block_size); /* It is valid for no page0 to be available. */ if (big) dev_spec = data->hdr_big.dev_spec; else dev_spec = data->hdr.dev_spec; if (ISSET(dev_spec, SMH_DSP_WRITE_PROT)) SET(link->flags, SDEV_READONLY); else CLR(link->flags, SDEV_READONLY); st->media_blksize = block_size; st->media_density = density; SC_DEBUG(link, SDEV_DB3, ("density code 0x%x, %d-byte blocks, write-%s, %sbuffered\n", st->media_density, st->media_blksize, ISSET(link->flags, SDEV_READONLY) ? "protected" : "enabled", ISSET(dev_spec, SMH_DSP_BUFF_MODE) ? "" : "un")); SET(link->flags, SDEV_MEDIA_LOADED); done: if (data) dma_free(data, sizeof(*data)); return error; } /* * Send a filled out parameter structure to the drive to * set it into the desire mode etc. */ int st_mode_select(struct st_softc *st, int flags) { union scsi_mode_sense_buf *inbuf = NULL, *outbuf = NULL; struct scsi_blk_desc general; struct scsi_link *link = st->sc_link; u_int8_t *page0 = NULL; int error = 0, big, page0_size; inbuf = dma_alloc(sizeof(*inbuf), PR_NOWAIT); if (inbuf == NULL) { error = ENOMEM; goto done; } outbuf = dma_alloc(sizeof(*outbuf), PR_NOWAIT | PR_ZERO); if (outbuf == NULL) { error = ENOMEM; goto done; } /* * This quirk deals with drives that have only one valid mode and think * this gives them license to reject all mode selects, even if the * selected mode is the one that is supported. */ if (ISSET(st->quirks, ST_Q_UNIMODAL)) { SC_DEBUG(link, SDEV_DB3, ("not setting density 0x%x blksize 0x%x\n", st->density, st->blksize)); error = 0; goto done; } if (ISSET(link->flags, SDEV_ATAPI)) { error = 0; goto done; } bzero(&general, sizeof(general)); general.density = st->density; if (ISSET(st->flags, ST_FIXEDBLOCKS)) _lto3b(st->blksize, general.blklen); /* * Ask for page 0 (vendor specific) mode sense data. * * page0 == NULL is a valid situation. */ error = scsi_do_mode_sense(link, 0, inbuf, (void **)&page0, 1, flags | SCSI_SILENT, &big); if (error != 0) goto done; if (page0 == NULL) { page0_size = 0; } else if (big == 0) { page0_size = inbuf->hdr.data_length + sizeof(inbuf->hdr.data_length) - sizeof(inbuf->hdr) - inbuf->hdr.blk_desc_len; memcpy(&outbuf->buf[sizeof(outbuf->hdr)+ sizeof(general)], page0, page0_size); } else { page0_size = _2btol(inbuf->hdr_big.data_length) + sizeof(inbuf->hdr_big.data_length) - sizeof(inbuf->hdr_big) - _2btol(inbuf->hdr_big.blk_desc_len); memcpy(&outbuf->buf[sizeof(outbuf->hdr_big) + sizeof(general)], page0, page0_size); } /* * Set up for a mode select. */ if (big == 0) { outbuf->hdr.data_length = sizeof(outbuf->hdr) + sizeof(general) + page0_size - sizeof(outbuf->hdr.data_length); if (!ISSET(st->flags, ST_DONTBUFFER)) outbuf->hdr.dev_spec = SMH_DSP_BUFF_MODE_ON; outbuf->hdr.blk_desc_len = sizeof(general); memcpy(&outbuf->buf[sizeof(outbuf->hdr)], &general, sizeof(general)); error = scsi_mode_select(st->sc_link, 0, &outbuf->hdr, flags, ST_CTL_TIME); goto done; } /* MODE SENSE (10) header was returned, so use MODE SELECT (10). */ _lto2b((sizeof(outbuf->hdr_big) + sizeof(general) + page0_size - sizeof(outbuf->hdr_big.data_length)), outbuf->hdr_big.data_length); if (!ISSET(st->flags, ST_DONTBUFFER)) outbuf->hdr_big.dev_spec = SMH_DSP_BUFF_MODE_ON; _lto2b(sizeof(general), outbuf->hdr_big.blk_desc_len); memcpy(&outbuf->buf[sizeof(outbuf->hdr_big)], &general, sizeof(general)); error = scsi_mode_select_big(st->sc_link, 0, &outbuf->hdr_big, flags, ST_CTL_TIME); done: if (inbuf) dma_free(inbuf, sizeof(*inbuf)); if (outbuf) dma_free(outbuf, sizeof(*outbuf)); return error; } /* * issue an erase command */ int st_erase(struct st_softc *st, int full, int flags) { struct scsi_erase *cmd; struct scsi_xfer *xs; int error; xs = scsi_xs_get(st->sc_link, flags); if (xs == NULL) return ENOMEM; xs->cmdlen = sizeof(*cmd); /* * Full erase means set LONG bit in erase command, which asks * the drive to erase the entire unit. Without this bit, we're * asking the drive to write an erase gap. */ cmd = (struct scsi_erase *)&xs->cmd; cmd->opcode = ERASE; if (full) { cmd->byte2 = SE_IMMED|SE_LONG; xs->timeout = ST_SPC_TIME; } else { cmd->byte2 = SE_IMMED; xs->timeout = ST_IO_TIME; } /* * XXX We always do this asynchronously, for now. How long should * we wait if we want to (eventually) to it synchronously? */ error = scsi_xs_sync(xs); scsi_xs_put(xs); return error; } /* * skip N blocks/filemarks/seq filemarks/eom */ int st_space(struct st_softc *st, int number, u_int what, int flags) { struct scsi_space *cmd; struct scsi_xfer *xs; int error; switch (what) { case SP_BLKS: if (ISSET(st->flags, ST_PER_ACTION)) { if (number > 0) { CLR(st->flags, ST_PER_ACTION); return EIO; } else if (number < 0) { if (ISSET(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 != 0) return error; } if (ISSET(st->flags, ST_BLANK_READ)) { CLR(st->flags, ST_BLANK_READ); return EIO; } CLR(st->flags, ST_EIO_PENDING | ST_EOM_PENDING); } } break; case SP_FILEMARKS: if (ISSET(st->flags, ST_EIO_PENDING)) { if (number > 0) { /* pretend we just discovered the error */ CLR(st->flags, ST_EIO_PENDING); return EIO; } else if (number < 0) { /* back away from the error */ CLR(st->flags, ST_EIO_PENDING); } } if (ISSET(st->flags, ST_AT_FILEMARK)) { CLR(st->flags, ST_AT_FILEMARK); number--; } if (ISSET(st->flags, ST_BLANK_READ) && (number < 0)) { /* back away from unwritten tape */ CLR(st->flags, ST_BLANK_READ); number++; /* XXX dubious */ } break; case SP_EOM: if (ISSET(st->flags, ST_EOM_PENDING)) { /* We are already there. */ CLR(st->flags, ST_EOM_PENDING); return 0; } if (ISSET(st->flags, ST_EIO_PENDING)) { /* pretend we just discovered the error */ CLR(st->flags, ST_EIO_PENDING); return EIO; } if (ISSET(st->flags, ST_AT_FILEMARK)) CLR(st->flags, ST_AT_FILEMARK); break; } if (number == 0) return 0; xs = scsi_xs_get(st->sc_link, flags); if (xs == NULL) return ENOMEM; cmd = (struct scsi_space *)&xs->cmd; cmd->opcode = SPACE; cmd->byte2 = what; _lto3b(number, cmd->number); xs->cmdlen = sizeof(*cmd); xs->timeout = ST_SPC_TIME; CLR(st->flags, ST_EOD_DETECTED); error = scsi_xs_sync(xs); scsi_xs_put(xs); if (error != 0) { st->media_fileno = -1; st->media_blkno = -1; } else { switch (what) { case SP_BLKS: if (st->media_blkno != -1) { st->media_blkno += number; if (st->media_blkno < 0) st->media_blkno = -1; } break; case SP_FILEMARKS: if (st->media_fileno != -1) { if (!ISSET(st->flags, ST_EOD_DETECTED)) st->media_fileno += number; if (st->media_fileno > st->media_eom) st->media_eom = st->media_fileno; st->media_blkno = 0; } break; case SP_EOM: if (st->media_eom != -1) { st->media_fileno = st->media_eom; st->media_blkno = 0; } else { st->media_fileno = -1; st->media_blkno = -1; } break; default: st->media_fileno = -1; st->media_blkno = -1; break; } } return error; } /* * write N filemarks */ int st_write_filemarks(struct st_softc *st, int number, int flags) { struct scsi_write_filemarks *cmd; struct scsi_xfer *xs; int error; if (number < 0) return EINVAL; xs = scsi_xs_get(st->sc_link, flags); if (xs == NULL) return ENOMEM; xs->cmdlen = sizeof(*cmd); xs->timeout = ST_IO_TIME * 4; switch (number) { case 0: /* really a command to sync the drive's buffers */ break; case 1: if (ISSET(st->flags, ST_FM_WRITTEN)) /* already have one down */ CLR(st->flags, ST_WRITTEN); else SET(st->flags, ST_FM_WRITTEN); CLR(st->flags, ST_PER_ACTION); break; default: CLR(st->flags, ST_PER_ACTION | ST_WRITTEN); break; } cmd = (struct scsi_write_filemarks *)&xs->cmd; cmd->opcode = WRITE_FILEMARKS; _lto3b(number, cmd->number); error = scsi_xs_sync(xs); scsi_xs_put(xs); if (error != 0) { st->media_fileno = -1; st->media_blkno = -1; st->media_eom = -1; } else if (st->media_fileno != -1) { st->media_fileno += number; st->media_eom = st->media_fileno; st->media_blkno = 0; } return error; } /* * 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(struct st_softc *st, int 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 (error == 0 && position != 0) error = st_space(st, -*nmarks, SP_FILEMARKS, flags); return error; } /* * load/unload/retension */ int st_load(struct st_softc *st, u_int type, int flags) { struct scsi_load *cmd; struct scsi_xfer *xs; int error, nmarks; st->media_fileno = -1; st->media_blkno = -1; st->media_eom = -1; if (type != LD_LOAD) { error = st_check_eod(st, 0, &nmarks, flags); if (error != 0) return error; } if (ISSET(st->quirks, ST_Q_IGNORE_LOADS)) { if (type == LD_LOAD) { /* * If we ignore loads, at least we should try a rewind. */ return st_rewind(st, 0, flags); } return 0; } xs = scsi_xs_get(st->sc_link, flags); if (xs == NULL) return ENOMEM; xs->cmdlen = sizeof(*cmd); xs->timeout = ST_SPC_TIME; cmd = (struct scsi_load *)&xs->cmd; cmd->opcode = LOAD; cmd->how = type; error = scsi_xs_sync(xs); scsi_xs_put(xs); return error; } /* * Rewind the device */ int st_rewind(struct st_softc *st, u_int immediate, int flags) { struct scsi_rewind *cmd; struct scsi_xfer *xs; int error, nmarks; error = st_check_eod(st, 0, &nmarks, flags); if (error != 0) return error; CLR(st->flags, ST_PER_ACTION); xs = scsi_xs_get(st->sc_link, flags); if (xs == NULL) return ENOMEM; xs->cmdlen = sizeof(*cmd); xs->timeout = immediate ? ST_CTL_TIME : ST_SPC_TIME; cmd = (struct scsi_rewind *)&xs->cmd; cmd->opcode = REWIND; cmd->byte2 = immediate; error = scsi_xs_sync(xs); scsi_xs_put(xs); if (error == 0) { st->media_fileno = 0; st->media_blkno = 0; } return error; } /* * Look at the returned sense and act on the error to determine * the unix error number to pass back... (0 = report no error) * (-1 = continue processing) */ int st_interpret_sense(struct scsi_xfer *xs) { struct scsi_sense_data *sense = &xs->sense; struct scsi_link *link = xs->sc_link; struct scsi_space *space; struct st_softc *st = link->device_softc; u_int8_t serr = sense->error_code & SSD_ERRCODE; u_int8_t skey = sense->flags & SSD_KEY; int32_t resid, info, number; int datalen; if (!ISSET(link->flags, SDEV_OPEN) || (serr != SSD_ERRCODE_CURRENT && serr != SSD_ERRCODE_DEFERRED)) return scsi_interpret_sense(xs); info = (int32_t)_4btol(sense->info); switch (skey) { /* * We do custom processing in st for the unit becoming ready case. * in this case we do not allow xs->retries to be decremented * only on the "Unit Becoming Ready" case. This is because tape * drives report "Unit Becoming Ready" when loading media, etc. * and can take a long time. Rather than having a massive timeout * for all operations (which would cause other problems) we allow * operations to wait (but be interruptible with Ctrl-C) forever * as long as the drive is reporting that it is becoming ready. * all other cases are handled as per the default. */ case SKEY_NOT_READY: if (ISSET(xs->flags, SCSI_IGNORE_NOT_READY)) return 0; switch (ASC_ASCQ(sense)) { case SENSE_NOT_READY_BECOMING_READY: SC_DEBUG(link, SDEV_DB1, ("not ready: busy (%#x)\n", sense->add_sense_code_qual)); /* don't count this as a retry */ xs->retries++; return scsi_delay(xs, 1); default: return scsi_interpret_sense(xs); } break; case SKEY_BLANK_CHECK: if (sense->error_code & SSD_ERRCODE_VALID && xs->cmd.opcode == SPACE) { switch (ASC_ASCQ(sense)) { case SENSE_END_OF_DATA_DETECTED: SET(st->flags, ST_EOD_DETECTED); space = (struct scsi_space *)&xs->cmd; number = _3btol(space->number); st->media_fileno = number - info; st->media_eom = st->media_fileno; return 0; case SENSE_BEGINNING_OF_MEDIUM_DETECTED: /* Standard says: Position is undefined! */ SET(st->flags, ST_BOD_DETECTED); st->media_fileno = -1; st->media_blkno = -1; return 0; } } break; case SKEY_NO_SENSE: case SKEY_RECOVERED_ERROR: case SKEY_MEDIUM_ERROR: case SKEY_VOLUME_OVERFLOW: break; default: return scsi_interpret_sense(xs); } /* * 'resid' can be in units of st->blksize or bytes. xs->resid and * xs->datalen are always in units of bytes. So we need a variable * to store datalen in the same units as resid and to adjust * xs->resid to be in bytes. */ if (ISSET(sense->error_code, SSD_ERRCODE_VALID)) { if (ISSET(st->flags, ST_FIXEDBLOCKS)) resid = info * st->blksize; /* XXXX overflow? */ else resid = info; } else { resid = xs->datalen; } if (resid < 0 || resid > xs->datalen) xs->resid = xs->datalen; else xs->resid = resid; datalen = xs->datalen; if (ISSET(st->flags, ST_FIXEDBLOCKS)) { resid /= st->blksize; datalen /= st->blksize; } if (ISSET(sense->flags, SSD_FILEMARK)) { if (st->media_fileno != -1) { st->media_fileno++; if (st->media_fileno > st->media_eom) st->media_eom = st->media_fileno; st->media_blkno = 0; } if (!ISSET(st->flags, ST_FIXEDBLOCKS)) return 0; SET(st->flags, ST_AT_FILEMARK); } if (ISSET(sense->flags, SSD_EOM)) { SET(st->flags, ST_EOM_PENDING); xs->resid = 0; if (ISSET(st->flags, ST_FIXEDBLOCKS)) return 0; } if (ISSET(sense->flags, SSD_ILI)) { if (!ISSET(st->flags, ST_FIXEDBLOCKS)) { if (resid >= 0 && resid <= datalen) return 0; if (!ISSET(xs->flags, SCSI_SILENT)) printf( "%s: bad residual %d out of " "%d\n", st->sc_dev.dv_xname, resid, datalen); return EIO; } /* Fixed size blocks. */ if (ISSET(sense->error_code, SSD_ERRCODE_VALID)) if (!ISSET(xs->flags, SCSI_SILENT)) printf("%s: block wrong size, %d blocks " "residual\n", st->sc_dev.dv_xname, resid); SET(st->flags, ST_EIO_PENDING); /* * 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 (ISSET(st->quirks, ST_Q_SENSE_HELP) && !ISSET(link->flags, SDEV_MEDIA_LOADED)) st->blksize -= 512; } if (ISSET(st->flags, ST_FIXEDBLOCKS) && xs->resid == xs->datalen) { if (ISSET(st->flags, ST_EIO_PENDING)) return EIO; if (ISSET(st->flags, ST_AT_FILEMARK)) return 0; } if (skey == SKEY_BLANK_CHECK) { /* * 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 (ISSET(st->quirks, ST_Q_SENSE_HELP) && !ISSET(link->flags, SDEV_MEDIA_LOADED)) { /* still starting */ st->blksize -= 512; } else if (!ISSET(st->flags, ST_2FM_AT_EOD | ST_BLANK_READ)) { SET(st->flags, ST_BLANK_READ); SET(st->flags, ST_EOM_PENDING); xs->resid = xs->datalen; return 0; } } return scsi_interpret_sense(xs); } /* * 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(struct st_softc *st) { char *buf = NULL; int readsize, maxblksize = 1024; int error = 0; if ((error = st_mode_sense(st, 0)) != 0) goto done; buf = dma_alloc(maxblksize, PR_NOWAIT); if (buf == NULL) { error = ENOMEM; goto done; } st->blksize = 1024; do { switch (st->blksize) { case 512: case 1024: readsize = st->blksize; SET(st->flags, ST_FIXEDBLOCKS); break; default: readsize = 1; CLR(st->flags, ST_FIXEDBLOCKS); } if ((error = st_mode_select(st, 0)) != 0) goto done; st_read(st, buf, readsize, SCSI_SILENT); /* XXX */ if ((error = st_rewind(st, 0, 0)) != 0) goto done; } while (readsize != 1 && readsize > st->blksize); done: dma_free(buf, maxblksize); return error; }