/* $NetBSD: st.c,v 1.230.8.4 2019/11/04 14:22:13 martin Exp $ */ /*- * Copyright (c) 1998, 2004 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Charles M. Hannum. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``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 FOUNDATION OR CONTRIBUTORS * 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 * * A lot of rewhacking done by mjacob (mjacob@nas.nasa.gov). */ #include __KERNEL_RCSID(0, "$NetBSD: st.c,v 1.230.8.4 2019/11/04 14:22:13 martin Exp $"); #ifdef _KERNEL_OPT #include "opt_scsi.h" #endif #include #include #include #include #include #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 STDSTY(z) ((minor(z) >> 2) & 0x03) #define STUNIT(z) ((minor(z) >> 4) ) #define STNMINOR 16 #define NORMAL_MODE 0 #define NOREW_MODE 1 #define EJECT_MODE 2 #define CTRL_MODE 3 #ifndef ST_MOUNT_DELAY #define ST_MOUNT_DELAY 0 #endif static dev_type_open(stopen); static dev_type_close(stclose); static dev_type_read(stread); static dev_type_write(stwrite); static dev_type_ioctl(stioctl); static dev_type_strategy(ststrategy); static dev_type_dump(stdump); const struct bdevsw st_bdevsw = { .d_open = stopen, .d_close = stclose, .d_strategy = ststrategy, .d_ioctl = stioctl, .d_dump = stdump, .d_psize = nosize, .d_discard = nodiscard, .d_flag = D_TAPE | D_MPSAFE }; const struct cdevsw st_cdevsw = { .d_open = stopen, .d_close = stclose, .d_read = stread, .d_write = stwrite, .d_ioctl = stioctl, .d_stop = nostop, .d_tty = notty, .d_poll = nopoll, .d_mmap = nommap, .d_kqfilter = nokqfilter, .d_discard = nodiscard, .d_flag = D_TAPE | D_MPSAFE }; /* * Define various devices that we know mis-behave in some way, * and note how they are bad, so we can correct for them */ static const struct st_quirk_inquiry_pattern st_quirk_patterns[] = { {{T_SEQUENTIAL, T_REMOV, " ", " ", " "}, {0, 0, { {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ {ST_Q_FORCE_BLKSIZE, 512, QIC_24}, /* minor 4-7 */ {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_1600}, /* minor 8-11 */ {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_6250} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "TANDBERG", " TDC 3600 ", ""}, {0, 12, { {0, 0, 0}, /* minor 0-3 */ {ST_Q_FORCE_BLKSIZE, 0, QIC_525}, /* minor 4-7 */ {0, 0, QIC_150}, /* minor 8-11 */ {0, 0, QIC_120} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "TANDBERG", " TDC 3800 ", ""}, {0, 0, { {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ {0, 0, QIC_525}, /* minor 4-7 */ {0, 0, QIC_150}, /* minor 8-11 */ {0, 0, QIC_120} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "TANDBERG", " SLR5 4/8GB ", ""}, {0, 0, { {ST_Q_FORCE_BLKSIZE, 1024, 0}, /* minor 0-3 */ {0, 0, 0}, /* minor 4-7 */ {0, 0, 0}, /* minor 8-11 */ {0, 0, 0} /* minor 12-15 */ }}}, /* * lacking a manual for the 4200, it's not clear what the * specific density codes should be- the device is a 2.5GB * capable QIC drive, those density codes aren't readily * availabel. The 'default' will just have to do. */ {{T_SEQUENTIAL, T_REMOV, "TANDBERG", " TDC 4200 ", ""}, {0, 0, { {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ {0, 0, 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 */ {{T_SEQUENTIAL, T_REMOV, "ARCHIVE ", "VIPER 2525 25462", ""}, {0, 0, { {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */ {ST_Q_SENSE_HELP, 0, 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 */ {{T_SEQUENTIAL, T_REMOV, "SANKYO ", "CP525 ", ""}, {0, 0, { {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */ {0, 0, QIC_150}, /* minor 8-11 */ {0, 0, QIC_120} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "ANRITSU ", "DMT780 ", ""}, {0, 0, { {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */ {0, 0, QIC_150}, /* minor 8-11 */ {0, 0, QIC_120} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "ARCHIVE ", "VIPER 150 21247", ""}, {ST_Q_ERASE_NOIMM, 12, { {ST_Q_SENSE_HELP, 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 */ }}}, {{T_SEQUENTIAL, T_REMOV, "ARCHIVE ", "VIPER 150 21531", ""}, {ST_Q_ERASE_NOIMM, 12, { {ST_Q_SENSE_HELP, 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 */ }}}, {{T_SEQUENTIAL, T_REMOV, "WANGTEK ", "5099ES SCSI", ""}, {0, 0, { {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ {0, 0, QIC_11}, /* minor 4-7 */ {0, 0, QIC_24}, /* minor 8-11 */ {0, 0, QIC_24} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "WANGTEK ", "5150ES SCSI", ""}, {0, 0, { {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ {0, 0, QIC_24}, /* minor 4-7 */ {0, 0, QIC_120}, /* minor 8-11 */ {0, 0, QIC_150} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "WANGTEK ", "5525ES SCSI REV7", ""}, {0, 0, { {0, 0, 0}, /* minor 0-3 */ {ST_Q_BLKSIZE, 0, QIC_525}, /* minor 4-7 */ {0, 0, QIC_150}, /* minor 8-11 */ {0, 0, QIC_120} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "WangDAT ", "Model 1300 ", ""}, {0, 0, { {0, 0, 0}, /* minor 0-3 */ {ST_Q_FORCE_BLKSIZE, 512, DDS}, /* minor 4-7 */ {ST_Q_FORCE_BLKSIZE, 1024, DDS}, /* minor 8-11 */ {ST_Q_FORCE_BLKSIZE, 0, DDS} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "EXABYTE ", "EXB-8200 ", "263H"}, {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 */ }}}, {{T_SEQUENTIAL, T_REMOV, "STK", "9490", ""}, {ST_Q_FORCE_BLKSIZE, 0, { {0, 0, 0}, /* minor 0-3 */ {0, 0, 0}, /* minor 4-7 */ {0, 0, 0}, /* minor 8-11 */ {0, 0, 0} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "STK", "SD-3", ""}, {ST_Q_FORCE_BLKSIZE, 0, { {0, 0, 0}, /* minor 0-3 */ {0, 0, 0}, /* minor 4-7 */ {0, 0, 0}, /* minor 8-11 */ {0, 0, 0} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "IBM", "03590", ""}, {ST_Q_IGNORE_LOADS, 0, { {0, 0, 0}, /* minor 0-3 */ {0, 0, 0}, /* minor 4-7 */ {0, 0, 0}, /* minor 8-11 */ {0, 0, 0} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "HP ", "T4000s ", ""}, {ST_Q_UNIMODAL, 0, { {0, 0, QIC_3095}, /* minor 0-3 */ {0, 0, QIC_3095}, /* minor 4-7 */ {0, 0, QIC_3095}, /* minor 8-11 */ {0, 0, QIC_3095}, /* minor 12-15 */ }}}, #if 0 {{T_SEQUENTIAL, T_REMOV, "EXABYTE ", "EXB-8200 ", ""}, {0, 12, { {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 {{T_SEQUENTIAL, T_REMOV, "TEAC ", "MT-2ST/N50 ", ""}, {ST_Q_IGNORE_LOADS, 0, { {0, 0, 0}, /* minor 0-3 */ {0, 0, 0}, /* minor 4-7 */ {0, 0, 0}, /* minor 8-11 */ {0, 0, 0} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "OnStream", "ADR50 Drive", ""}, {ST_Q_UNIMODAL, 0, { {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 4-7 */ {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 8-11 */ {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "OnStream DI-30", "", "1.0"}, {ST_Q_NOFILEMARKS, 0, { {0, 0, 0}, /* minor 0-3 */ {0, 0, 0}, /* minor 4-7 */ {0, 0, 0}, /* minor 8-11 */ {0, 0, 0} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "NCR H621", "0-STD-03-46F880 ", ""}, {ST_Q_NOPREVENT, 0, { {0, 0, 0}, /* minor 0-3 */ {0, 0, 0}, /* minor 4-7 */ {0, 0, 0}, /* minor 8-11 */ {0, 0, 0} /* minor 12-15 */ }}}, {{T_SEQUENTIAL, T_REMOV, "Seagate STT3401A", "hp0atxa", ""}, {0, 0, { {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ {ST_Q_FORCE_BLKSIZE, 1024, 0}, /* minor 4-7 */ {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 8-11 */ {ST_Q_FORCE_BLKSIZE, 512, 0} /* minor 12-15 */ }}}, }; #define NOEJECT 0 #define EJECT 1 static void st_identify_drive(struct st_softc *, struct scsipi_inquiry_pattern *); static void st_loadquirks(struct st_softc *); static int st_mount_tape(dev_t, int); static void st_unmount(struct st_softc *, boolean); static int st_decide_mode(struct st_softc *, boolean); static void ststart(struct scsipi_periph *); static int ststart1(struct scsipi_periph *, struct buf *); static void strestart(void *); static void stdone(struct scsipi_xfer *, int); static int st_read(struct st_softc *, char *, int, int); static int st_space(struct st_softc *, int, u_int, int); static int st_write_filemarks(struct st_softc *, int, int); static int st_check_eod(struct st_softc *, boolean, int *, int); static int st_load(struct st_softc *, u_int, int); static int st_rewind(struct st_softc *, u_int, int); static int st_interpret_sense(struct scsipi_xfer *); static int st_touch_tape(struct st_softc *); static int st_erase(struct st_softc *, int full, int flags); static void st_updatefilepos(struct st_softc *); static int st_rdpos(struct st_softc *, int, uint32_t *); static int st_setpos(struct st_softc *, int, uint32_t *); static const struct scsipi_periphsw st_switch = { st_interpret_sense, ststart, NULL, stdone }; #if defined(ST_ENABLE_EARLYWARN) #define ST_INIT_FLAGS ST_EARLYWARN #else #define ST_INIT_FLAGS 0 #endif /* * The routine called by the low level scsi routine when it discovers * A device suitable for this driver */ void stattach(device_t parent, device_t self, void *aux) { struct st_softc *st = device_private(self); struct scsipibus_attach_args *sa = aux; struct scsipi_periph *periph = sa->sa_periph; SC_DEBUG(periph, SCSIPI_DB2, ("stattach: ")); st->sc_dev = self; /* Store information needed to contact our base driver */ st->sc_periph = periph; periph->periph_dev = st->sc_dev; periph->periph_switch = &st_switch; /* Set initial flags */ st->flags = ST_INIT_FLAGS; /* Set up the buf queues for this device */ bufq_alloc(&st->buf_queue, "fcfs", 0); bufq_alloc(&st->buf_defer, "fcfs", 0); callout_init(&st->sc_callout, 0); mutex_init(&st->sc_iolock, MUTEX_DEFAULT, IPL_VM); /* * Check if the drive is a known criminal and take * Any steps needed to bring it into line */ st_identify_drive(st, &sa->sa_inqbuf); aprint_naive("\n"); aprint_normal("\n"); /* Use the subdriver to request information regarding the drive. */ aprint_normal_dev(self, "%s", st->quirkdata ? "quirks apply, " : ""); if (scsipi_test_unit_ready(periph, XS_CTL_DISCOVERY | XS_CTL_SILENT | XS_CTL_IGNORE_MEDIA_CHANGE) || st->ops(st, ST_OPS_MODESENSE, XS_CTL_DISCOVERY | XS_CTL_SILENT | XS_CTL_IGNORE_MEDIA_CHANGE)) aprint_normal("drive empty\n"); else { aprint_normal("density code %d, ", st->media_density); if (st->media_blksize > 0) aprint_normal("%d-byte", st->media_blksize); else aprint_normal("variable"); aprint_normal(" blocks, write-%s\n", (st->flags & ST_READONLY) ? "protected" : "enabled"); } st->stats = iostat_alloc(IOSTAT_TAPE, parent, device_xname(st->sc_dev)); rnd_attach_source(&st->rnd_source, device_xname(st->sc_dev), RND_TYPE_TAPE, RND_FLAG_DEFAULT); } int stdetach(device_t self, int flags) { struct st_softc *st = device_private(self); struct scsipi_periph *periph = st->sc_periph; struct scsipi_channel *chan = periph->periph_channel; int bmaj, cmaj, mn; /* locate the major number */ bmaj = bdevsw_lookup_major(&st_bdevsw); cmaj = cdevsw_lookup_major(&st_cdevsw); /* kill any pending restart */ callout_halt(&st->sc_callout, NULL); mutex_enter(chan_mtx(chan)); /* Kill off any queued buffers. */ bufq_drain(st->buf_defer); bufq_drain(st->buf_queue); /* Kill off any pending commands. */ scsipi_kill_pending(st->sc_periph); mutex_exit(chan_mtx(chan)); bufq_free(st->buf_defer); bufq_free(st->buf_queue); mutex_destroy(&st->sc_iolock); /* Nuke the vnodes for any open instances */ mn = STUNIT(device_unit(self)); vdevgone(bmaj, mn, mn+STNMINOR-1, VBLK); vdevgone(cmaj, mn, mn+STNMINOR-1, VCHR); iostat_free(st->stats); /* Unhook the entropy source. */ rnd_detach_source(&st->rnd_source); return 0; } /* * Use the inquiry routine in 'scsi_base' to get drive info so we can * Further tailor our behaviour. */ static void st_identify_drive(struct st_softc *st, struct scsipi_inquiry_pattern *inqbuf) { const struct st_quirk_inquiry_pattern *finger; int priority; finger = scsipi_inqmatch(inqbuf, st_quirk_patterns, sizeof(st_quirk_patterns) / sizeof(st_quirk_patterns[0]), sizeof(st_quirk_patterns[0]), &priority); if (priority != 0) { st->quirkdata = &finger->quirkdata; st->drive_quirks = finger->quirkdata.quirks; st->quirks = finger->quirkdata.quirks; /* start value */ st->page_0_size = finger->quirkdata.page_0_size; KASSERT(st->page_0_size <= MAX_PAGE_0_SIZE); st_loadquirks(st); } } /* * initialise the subdevices to the default (QUIRK) state. * this will remove any setting made by the system operator or previous * operations. */ static void st_loadquirks(struct st_softc *st) { const struct modes *mode; struct modes *mode2; int i; mode = st->quirkdata->modes; mode2 = st->modes; for (i = 0; i < 4; i++) { memset(mode2, 0, sizeof(struct modes)); st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK | DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER | DENSITY_SET_BY_USER); if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) { mode2->blksize = mode->blksize; st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; } if (mode->density) { mode2->density = mode->density; st->modeflags[i] |= DENSITY_SET_BY_QUIRK; } mode2->quirks |= mode->quirks; mode++; mode2++; } } /* open the device. */ static int stopen(dev_t dev, int flags, int mode, struct lwp *l) { u_int stmode, dsty; int error, sflags, unit, tries, ntries; struct st_softc *st; struct scsipi_periph *periph; struct scsipi_adapter *adapt; unit = STUNIT(dev); st = device_lookup_private(&st_cd, unit); if (st == NULL) return ENXIO; stmode = STMODE(dev); dsty = STDSTY(dev); periph = st->sc_periph; adapt = periph->periph_channel->chan_adapter; SC_DEBUG(periph, SCSIPI_DB1, ("open: dev=0x%"PRIx64" (unit %d (of %d))\n", dev, unit, st_cd.cd_ndevs)); /* Only allow one at a time */ if (periph->periph_flags & PERIPH_OPEN) { aprint_error_dev(st->sc_dev, "already open\n"); return EBUSY; } if ((error = scsipi_adapter_addref(adapt)) != 0) return error; /* clear any latched errors. */ st->mt_resid = 0; st->mt_erreg = 0; st->asc = 0; st->ascq = 0; /* * Catch any unit attention errors. Be silent about this * unless we're already mounted. We ignore media change * if we're in control mode or not mounted yet. */ if ((st->flags & ST_MOUNTED) == 0 || stmode == CTRL_MODE) { #ifdef SCSIDEBUG sflags = XS_CTL_IGNORE_MEDIA_CHANGE; #else sflags = XS_CTL_SILENT|XS_CTL_IGNORE_MEDIA_CHANGE; #endif } else sflags = 0; /* * If we're already mounted or we aren't configured for * a mount delay, only try a test unit ready once. Otherwise, * try up to ST_MOUNT_DELAY times with a rest interval of * one second between each try. */ if ((st->flags & ST_MOUNTED) || ST_MOUNT_DELAY == 0) ntries = 1; else ntries = ST_MOUNT_DELAY; for (error = tries = 0; tries < ntries; tries++) { int slpintr, oflags; /* * If we had no error, or we're opening the control mode * device, we jump out right away. */ error = scsipi_test_unit_ready(periph, sflags); if (error == 0 || stmode == CTRL_MODE) break; /* * We had an error. * * If we're already mounted or we aren't configured for * a mount delay, or the error isn't a NOT READY error, * skip to the error exit now. */ if ((st->flags & ST_MOUNTED) || ST_MOUNT_DELAY == 0 || (st->mt_key != SKEY_NOT_READY)) { device_printf(st->sc_dev, "mount error (sense key=%d) - " "terminating mount session\n", st->mt_key); /* * the following should not trigger unless * something serious happened while the device * was open (PREVENT MEDIUM REMOVAL in effect) */ if (st->flags & ST_WRITTEN && st->mt_key == SKEY_UNIT_ATTENTION) { /* * device / media state may have changed * refrain from writing missing file marks * onto potentially newly inserted/formatted * media (e. g. emergency EJECT/RESET/etc.) */ st->flags &= ~(ST_WRITTEN|ST_FM_WRITTEN); device_printf(st->sc_dev, "CAUTION: file marks/data may be missing" " - ASC = 0x%02x, ASCQ = 0x%02x\n", st->asc, st->ascq); } goto bad; } /* clear any latched errors. */ st->mt_resid = 0; st->mt_erreg = 0; st->asc = 0; st->ascq = 0; /* * Fake that we have the device open so * we block other apps from getting in. */ oflags = periph->periph_flags; periph->periph_flags |= PERIPH_OPEN; slpintr = kpause("stload", true, hz, NULL); periph->periph_flags = oflags; /* restore flags */ if (slpintr != 0 && slpintr != EWOULDBLOCK) { device_printf(st->sc_dev, "load interrupted\n"); goto bad; } } /* * If the mode is 3 (e.g. minor = 3,7,11,15) then the device has * been opened to set defaults and perform other, usually non-I/O * related, operations. In this case, do a quick check to see * whether the unit actually had a tape loaded (this will be known * as to whether or not we got a NOT READY for the above * unit attention). If a tape is there, go do a mount sequence. */ if (stmode == CTRL_MODE && st->mt_key != SKEY_NO_SENSE && st->mt_key != SKEY_UNIT_ATTENTION) { periph->periph_flags |= PERIPH_OPEN; return 0; } /* * If we get this far and had an error set, that means we failed * to pass the 'test unit ready' test for the non-controlmode device, * so we bounce the open. */ if (error) return error; /* Else, we're now committed to saying we're open. */ periph->periph_flags |= PERIPH_OPEN; /* unit attn are now errors */ /* * 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 || (periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) st_unmount(st, NOEJECT); /* * If we are not mounted, then we should start a new * mount session. */ if (!(st->flags & ST_MOUNTED)) { if ((error = st_mount_tape(dev, flags)) != 0) goto bad; st->last_dsty = dsty; } if (!(st->quirks & ST_Q_NOPREVENT)) { scsipi_prevent(periph, SPAMR_PREVENT_DT, XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_NOT_READY); } SC_DEBUG(periph, SCSIPI_DB2, ("open complete\n")); return 0; bad: st_unmount(st, NOEJECT); scsipi_adapter_delref(adapt); periph->periph_flags &= ~PERIPH_OPEN; return error; } static int stclose(dev_t dev, int flags, int mode, struct lwp *l) { int stxx, error = 0; struct st_softc *st = device_lookup_private(&st_cd, STUNIT(dev)); struct scsipi_periph *periph = st->sc_periph; struct scsipi_adapter *adapt = periph->periph_channel->chan_adapter; SC_DEBUG(st->sc_periph, SCSIPI_DB1, ("closing\n")); /* * 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. Actually, the Sun way of * things is to: * * only write filemarks if there are fmks to be written and * - open for write (possibly read/write) * - the last operation was a write * or: * - opened for wronly * - no data was written (including filemarks) */ stxx = st->flags & (ST_WRITTEN | ST_FM_WRITTEN); if ((flags & FWRITE) != 0) { int nm = 0; #ifdef ST_SUNCOMPAT /* * on request only * original compat code has not been working * since ~1998 */ if ((flags & O_ACCMODE) == FWRITE && (stxx == 0)) { st->flags |= ST_WRITTEN; SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("SUN compatibility: write FM(s) at close\n")); } #endif error = st_check_eod(st, FALSE, &nm, 0); SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("wrote %d FM(s) at close error=%d\n", nm, error)); } /* Allow robots to eject tape if needed. */ if (!(st->quirks & ST_Q_NOPREVENT)) { scsipi_prevent(periph, SPAMR_ALLOW, XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_NOT_READY); } switch (STMODE(dev)) { case NORMAL_MODE: st_unmount(st, NOEJECT); break; case NOREW_MODE: case CTRL_MODE: /* * Leave mounted unless media seems to have been removed. * * Otherwise, if we're to terminate a tape with more than one * filemark [ and because we're not rewinding here ], backspace * one filemark so that later appends will see an unbroken * sequence of: * * file - FMK - file - FMK ... file - FMK FMK (EOM) */ if ((periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) { st_unmount(st, NOEJECT); } else if (error == 0) { /* * ST_WRITTEN was preserved from above. * * All we need to know here is: * * Were we writing this tape and was the last * operation a write? * * Are there supposed to be 2FM at EOD? * * If both statements are true, then we backspace * one filemark. */ stxx &= ~ST_FM_WRITTEN; stxx |= (st->flags & ST_2FM_AT_EOD); if ((flags & FWRITE) != 0 && (stxx == (ST_2FM_AT_EOD|ST_WRITTEN))) { error = st_space(st, -1, SP_FILEMARKS, 0); SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("st_space(-1) error=%d\n", error)); } else { SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("no backspacing - flags = 0x%x, stxx=0x%x, st->flags=0x%x\n", flags, stxx, st->flags)); } } else { SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("error %d from st_check_eod\n", error)); } break; case EJECT_MODE: st_unmount(st, EJECT); break; } KASSERTMSG((st->flags & ST_WRITTEN) == 0, "pending ST_WRITTEN flag NOT cleared (flags=0x%x)", st->flags); scsipi_wait_drain(periph); scsipi_adapter_delref(adapt); periph->periph_flags &= ~PERIPH_OPEN; return error; } /* * Start a new mount session. * Copy in all the default parameters from the selected device mode. * and try guess any that seem to be defaulted. */ static int st_mount_tape(dev_t dev, int flags) { int unit; u_int dsty; struct st_softc *st; struct scsipi_periph *periph; int error = 0; unit = STUNIT(dev); dsty = STDSTY(dev); st = device_lookup_private(&st_cd, unit); periph = st->sc_periph; if (st->flags & ST_MOUNTED) return 0; SC_DEBUG(periph, SCSIPI_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, XS_CTL_SILENT)) != 0) return error; /* * Throw another dummy instruction to catch * 'Unit attention' errors. Many drives give * these after doing a Load instruction (with * the MEDIUM MAY HAVE CHANGED asc/ascq). */ scsipi_test_unit_ready(periph, XS_CTL_SILENT); /* XXX */ /* * 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)) != 0) return error; /* * Load the physical device parameters * loads: blkmin, blkmax */ if ((error = st->ops(st, ST_OPS_RBL, 0)) != 0) return error; /* * Load the media dependent parameters * includes: media_blksize,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->ops(st, ST_OPS_MODESENSE, 0)) != 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->blksize = st->modes[dsty].blksize; if (st->blksize) st->flags |= ST_FIXEDBLOCKS; } else { if ((error = st_decide_mode(st, FALSE)) != 0) return error; } if ((error = st->ops(st, ST_OPS_MODESELECT, 0)) != 0) { /* ATAPI will return ENODEV for this, and this may be OK */ if (error != ENODEV) { aprint_error_dev(st->sc_dev, "cannot set selected mode\n"); return error; } } st->flags &= ~ST_NEW_MOUNT; st->flags |= ST_MOUNTED; periph->periph_flags |= PERIPH_MEDIA_LOADED; /* move earlier? */ st->blkno = st->fileno = (daddr_t) 0; 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 */ static void st_unmount(struct st_softc *st, boolean eject) { struct scsipi_periph *periph = st->sc_periph; int nmarks; if ((st->flags & ST_MOUNTED) == 0) return; SC_DEBUG(periph, SCSIPI_DB1, ("unmounting\n")); st_check_eod(st, FALSE, &nmarks, XS_CTL_IGNORE_NOT_READY); st_rewind(st, 0, XS_CTL_IGNORE_NOT_READY); /* * Section 9.3.3 of the SCSI specs states that a device shall return * the density value specified in the last successful MODE SELECT * after an unload operation, in case it is not able to * automatically determine the density of the new medium. * * So we instruct the device to use the default density, which will * prevent the use of stale density values (in particular, * in st_touch_tape(). */ st->density = 0; if (st->ops(st, ST_OPS_MODESELECT, 0) != 0) { aprint_error_dev(st->sc_dev, "WARNING: cannot revert to default density\n"); } if (eject) { if (!(st->quirks & ST_Q_NOPREVENT)) { scsipi_prevent(periph, SPAMR_ALLOW, XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_NOT_READY); } st_load(st, LD_UNLOAD, XS_CTL_IGNORE_NOT_READY); st->blkno = st->fileno = (daddr_t) -1; } else { st->blkno = st->fileno = (daddr_t) 0; } st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT); periph->periph_flags &= ~PERIPH_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, boolean first_read) { SC_DEBUG(st->sc_periph, SCSIPI_DB2, ("starting block mode decision\n")); /* * 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->blksize = st->blkmin; SC_DEBUG(st->sc_periph, SCSIPI_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->blksize = 0; SC_DEBUG(st->sc_periph, SCSIPI_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: case QIC_3095: case QIC_3220: st->flags |= ST_FIXEDBLOCKS; if (st->media_blksize > 0) st->blksize = st->media_blksize; else st->blksize = DEF_FIXED_BSIZE; SC_DEBUG(st->sc_periph, SCSIPI_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_BLKSIZE) || (st->media_blksize == 0) || (st->media_blksize == DEF_FIXED_BSIZE) || (st->media_blksize == 1024))) { if (st->media_blksize > 0) st->flags |= ST_FIXEDBLOCKS; else st->flags &= ~ST_FIXEDBLOCKS; st->blksize = st->media_blksize; SC_DEBUG(st->sc_periph, SCSIPI_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. */ st->flags &= ~ST_FIXEDBLOCKS; st->blksize = 0; SC_DEBUG(st->sc_periph, SCSIPI_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: case QIC_3095: case QIC_3220: st->flags &= ~ST_2FM_AT_EOD; break; default: st->flags |= ST_2FM_AT_EOD; } return 0; } /* * Actually translate the requested transfer into * one the physical driver can understand * The transfer is described by a buf and will include * only one physical transfer. */ static void ststrategy(struct buf *bp) { struct st_softc *st = device_lookup_private(&st_cd, STUNIT(bp->b_dev)); struct scsipi_periph *periph = st->sc_periph; struct scsipi_channel *chan = periph->periph_channel; SC_DEBUG(periph, SCSIPI_DB1, ("ststrategy %d bytes @ blk %" PRId64 "\n", bp->b_bcount, bp->b_blkno)); /* If it's a null transfer, return immediately */ if (bp->b_bcount == 0) goto abort; /* If offset is negative, error */ if (bp->b_blkno < 0) { SC_DEBUG(periph, SCSIPI_DB3, ("EINVAL: ststrategy negative blockcount %" PRId64 "\n", bp->b_blkno)); bp->b_error = EINVAL; goto abort; } /* Odd sized request on fixed drives are verboten */ if (st->flags & ST_FIXEDBLOCKS) { if (bp->b_bcount % st->blksize) { aprint_error_dev(st->sc_dev, "bad request, must be multiple of %d\n", st->blksize); bp->b_error = EIO; goto abort; } } /* as are out-of-range requests on variable drives. */ else if (bp->b_bcount < st->blkmin || (st->blkmax && bp->b_bcount > st->blkmax)) { aprint_error_dev(st->sc_dev, "bad request, must be between %d and %d\n", st->blkmin, st->blkmax); bp->b_error = EIO; goto abort; } mutex_enter(chan_mtx(chan)); /* * 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_put(st->buf_queue, 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..) */ ststart(periph); mutex_exit(chan_mtx(chan)); return; abort: /* * Reset the residue because we didn't do anything, * and send the buffer back as done. */ bp->b_resid = bp->b_bcount; biodone(bp); return; } /* * ststart looks to see if there is a buf waiting for the device * and that the device is not already busy. If the device is busy, * the request is deferred and retried on the next attempt. * If both are true, ststart creates a scsi command to perform * the transfer required. * * The transfer request will call scsipi_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 with channel lock held */ static int ststart1(struct scsipi_periph *periph, struct buf *bp) { struct st_softc *st = device_private(periph->periph_dev); struct scsipi_channel *chan = periph->periph_channel; struct scsi_rw_tape cmd; struct scsipi_xfer *xs; int flags, error; SC_DEBUG(periph, SCSIPI_DB2, ("ststart1 ")); mutex_enter(chan_mtx(chan)); if (periph->periph_active >= periph->periph_openings) { error = EAGAIN; goto out; } /* if a special awaits, let it proceed first */ if (periph->periph_flags & PERIPH_WAITING) { periph->periph_flags &= ~PERIPH_WAITING; cv_broadcast(periph_cv_periph(periph)); error = EAGAIN; goto out; } /* * If the device has been unmounted by the user * then throw away all requests until done. */ if (__predict_false((st->flags & ST_MOUNTED) == 0 || (periph->periph_flags & PERIPH_MEDIA_LOADED) == 0)) { error = EIO; goto out; } /* * only FIXEDBLOCK devices have pending I/O or space 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)) { error = EIO; goto out; } } else { bp->b_resid = bp->b_bcount; error = 0; st->flags &= ~ST_AT_FILEMARK; goto out; } } } /* * If we are at EOM but have not reported it * yet then we should report it now. */ if (st->flags & (ST_EOM_PENDING|ST_EIO_PENDING)) { error = EIO; goto out; } /* Fill out the scsi command */ memset(&cmd, 0, sizeof(cmd)); flags = XS_CTL_NOSLEEP | XS_CTL_ASYNC; if ((bp->b_flags & B_READ) == B_WRITE) { cmd.opcode = WRITE; st->flags &= ~ST_FM_WRITTEN; flags |= XS_CTL_DATA_OUT; } else { cmd.opcode = READ; flags |= XS_CTL_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->blksize, cmd.len); } else _lto3b(bp->b_bcount, cmd.len); /* Clear 'position updated' indicator */ st->flags &= ~ST_POSUPDATED; /* go ask the adapter to do all this for us */ xs = scsipi_make_xs_locked(periph, (struct scsipi_generic *)&cmd, sizeof(cmd), (u_char *)bp->b_data, bp->b_bcount, 0, ST_IO_TIME, bp, flags); if (__predict_false(xs == NULL)) { /* * out of memory. Keep this buffer in the queue, and * retry later. */ callout_reset(&st->sc_callout, hz / 2, strestart, periph); error = EAGAIN; goto out; } error = scsipi_execute_xs(xs); /* with a scsipi_xfer preallocated, scsipi_command can't fail */ KASSERT(error == 0); out: mutex_exit(chan_mtx(chan)); return error; } static void ststart(struct scsipi_periph *periph) { struct st_softc *st = device_private(periph->periph_dev); struct scsipi_channel *chan = periph->periph_channel; struct buf *bp; int error; SC_DEBUG(periph, SCSIPI_DB2, ("ststart ")); mutex_exit(chan_mtx(chan)); mutex_enter(&st->sc_iolock); while ((bp = bufq_get(st->buf_defer)) != NULL || (bp = bufq_get(st->buf_queue)) != NULL) { iostat_busy(st->stats); mutex_exit(&st->sc_iolock); error = ststart1(periph, bp); mutex_enter(&st->sc_iolock); if (error != 0) iostat_unbusy(st->stats, 0, ((bp->b_flags & B_READ) == B_READ)); if (error == EAGAIN) { bufq_put(st->buf_defer, bp); break; } mutex_exit(&st->sc_iolock); if (error != 0) { bp->b_error = error; bp->b_resid = bp->b_bcount; biodone(bp); } mutex_enter(&st->sc_iolock); } mutex_exit(&st->sc_iolock); mutex_enter(chan_mtx(chan)); } static void strestart(void *v) { struct scsipi_periph *periph = (struct scsipi_periph *)v; struct scsipi_channel *chan = periph->periph_channel; mutex_enter(chan_mtx(chan)); ststart((struct scsipi_periph *)v); mutex_exit(chan_mtx(chan)); } static void stdone(struct scsipi_xfer *xs, int error) { struct st_softc *st = device_private(xs->xs_periph->periph_dev); struct buf *bp = xs->bp; if (bp) { bp->b_error = error; bp->b_resid = xs->resid; /* * buggy device ? A SDLT320 can report an info * field of 0x3de8000 on a Media Error/Write Error * for this CBD: 0x0a 00 00 80 00 00 */ if (bp->b_resid > bp->b_bcount || bp->b_resid < 0) bp->b_resid = bp->b_bcount; mutex_enter(&st->sc_iolock); if ((bp->b_flags & B_READ) == B_WRITE) st->flags |= ST_WRITTEN; else st->flags &= ~ST_WRITTEN; iostat_unbusy(st->stats, bp->b_bcount, ((bp->b_flags & B_READ) == B_READ)); if ((st->flags & ST_POSUPDATED) == 0) { if (error) { st->fileno = st->blkno = -1; } else if (st->blkno != -1) { if (st->flags & ST_FIXEDBLOCKS) st->blkno += (bp->b_bcount / st->blksize); else st->blkno++; } } mutex_exit(&st->sc_iolock); rnd_add_uint32(&st->rnd_source, bp->b_blkno); biodone(bp); } } static int stread(dev_t dev, struct uio *uio, int iomode) { struct st_softc *st = device_lookup_private(&st_cd, STUNIT(dev)); int r = physio(ststrategy, NULL, dev, B_READ, st->sc_periph->periph_channel->chan_adapter->adapt_minphys, uio); SC_DEBUG(st->sc_periph, SCSIPI_DB1, ("[stread: result=%d]\n", r)); return r; } static int stwrite(dev_t dev, struct uio *uio, int iomode) { struct st_softc *st = device_lookup_private(&st_cd, STUNIT(dev)); int r = physio(ststrategy, NULL, dev, B_WRITE, st->sc_periph->periph_channel->chan_adapter->adapt_minphys, uio); SC_DEBUG(st->sc_periph, SCSIPI_DB1, ("[stwrite: result=%d]\n", r)); return r; } /* * Perform special action on behalf of the user; * knows about the internals of this device */ static int stioctl(dev_t dev, u_long cmd, void *arg, int flag, struct lwp *l) { int error = 0; int unit; int number, nmarks, dsty; int flags; struct st_softc *st; int hold_blksize; uint8_t 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 = device_lookup_private(&st_cd, unit); hold_blksize = st->blksize; hold_density = st->density; switch ((u_int)cmd) { case MTIOCGET: { struct mtget *g = (struct mtget *) arg; /* * (to get the current state of READONLY) */ error = st->ops(st, ST_OPS_MODESENSE, XS_CTL_SILENT); if (error) { /* * Ignore the error if in control mode; * this is mandated by st(4). */ if (STMODE(dev) != CTRL_MODE) break; error = 0; } SC_DEBUG(st->sc_periph, SCSIPI_DB1, ("[ioctl: get status]\n")); memset(g, 0, sizeof(struct mtget)); g->mt_type = MT_ISAR; /* Ultrix compat *//*? */ g->mt_blksiz = st->blksize; g->mt_density = st->density; g->mt_mblksiz[0] = st->modes[0].blksize; g->mt_mblksiz[1] = st->modes[1].blksize; g->mt_mblksiz[2] = st->modes[2].blksize; g->mt_mblksiz[3] = st->modes[3].blksize; 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; g->mt_fileno = st->fileno; g->mt_blkno = st->blkno; if (st->flags & ST_READONLY) g->mt_dsreg |= MT_DS_RDONLY; if (st->flags & ST_MOUNTED) g->mt_dsreg |= MT_DS_MOUNTED; g->mt_resid = st->mt_resid; g->mt_erreg = st->mt_erreg; /* * clear latched errors. */ st->mt_resid = 0; st->mt_erreg = 0; st->asc = 0; st->ascq = 0; break; } case MTIOCTOP: { SC_DEBUG(st->sc_periph, SCSIPI_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 */ st->flags &= ~ST_DONTBUFFER; goto try_new_value; case MTNOCACHE: /* disable controller cache */ 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 */ #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->blksize = number; st->flags |= ST_BLOCK_SET; /*XXX */ goto try_new_value; case MTSETDNSTY: /* Set density for device and mode */ /* * Any number >= 0 and <= 0xff is legal. Numbers * above 0x80 are 'vendor unique'. */ if (number < 0 || number > 255) { error = EINVAL; break; } else st->density = number; goto try_new_value; case MTCMPRESS: error = st->ops(st, (number == 0) ? ST_OPS_CMPRSS_OFF : ST_OPS_CMPRSS_ON, XS_CTL_SILENT); break; case MTEWARN: if (number) st->flags |= ST_EARLYWARN; else st->flags &= ~ST_EARLYWARN; break; default: error = EINVAL; } break; } case MTIOCIEOT: case MTIOCEEOT: break; case MTIOCRDSPOS: error = st_rdpos(st, 0, (uint32_t *)arg); break; case MTIOCRDHPOS: error = st_rdpos(st, 1, (uint32_t *)arg); break; case MTIOCSLOCATE: error = st_setpos(st, 0, (uint32_t *)arg); break; case MTIOCHLOCATE: error = st_setpos(st, 1, (uint32_t *)arg); break; default: error = scsipi_do_ioctl(st->sc_periph, dev, cmd, arg, flag, l); 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 in control mode, we can make (persistent) mode changes * even if no medium is loaded (see st(4)). */ if ((STMODE(dev) != CTRL_MODE || (st->flags & ST_MOUNTED) != 0) && (error = st->ops(st, ST_OPS_MODESELECT, 0)) != 0) { /* put it back as it was */ aprint_error_dev(st->sc_dev, "cannot set selected mode\n"); st->density = hold_density; st->blksize = hold_blksize; if (st->blksize) 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- but * if the device was opened in Control Mode, the values * are persistent now across mounts. */ if (STMODE(dev) == CTRL_MODE) { switch ((short) (mt->mt_op)) { case MTSETBSIZ: st->modes[dsty].blksize = st->blksize; st->modeflags[dsty] |= BLKSIZE_SET_BY_USER; break; case MTSETDNSTY: st->modes[dsty].density = st->density; st->modeflags[dsty] |= DENSITY_SET_BY_USER; break; } } return 0; } /* Do a synchronous read. */ static int st_read(struct st_softc *st, char *bf, int size, int flags) { struct scsi_rw_tape cmd; /* If it's a null transfer, return immediatly */ if (size == 0) return 0; memset(&cmd, 0, sizeof(cmd)); cmd.opcode = READ; if (st->flags & ST_FIXEDBLOCKS) { cmd.byte2 |= SRW_FIXED; _lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE), cmd.len); } else _lto3b(size, cmd.len); return scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), (void *)bf, size, 0, ST_IO_TIME, NULL, flags | XS_CTL_DATA_IN); } /* issue an erase command */ static int st_erase(struct st_softc *st, int full, int flags) { int tmo; struct scsi_erase 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. */ memset(&cmd, 0, sizeof(cmd)); cmd.opcode = ERASE; if (full) { cmd.byte2 = SE_LONG; tmo = ST_SPC_TIME; } else tmo = ST_IO_TIME; /* * XXX We always do this asynchronously, for now, unless the device * has the ST_Q_ERASE_NOIMM quirk. How long should we wait if we * want to (eventually) to it synchronously? */ if ((st->quirks & ST_Q_ERASE_NOIMM) == 0) cmd.byte2 |= SE_IMMED; return scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0, ST_RETRIES, tmo, NULL, flags); } /* skip N blocks/filemarks/seq filemarks/eom */ static int st_space(struct st_softc *st, int number, u_int what, int flags) { 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|ST_EOM_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_EOM_PENDING) { /* we're already there */ st->flags &= ~ST_EOM_PENDING; return 0; } 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; memset(&cmd, 0, sizeof(cmd)); cmd.opcode = SPACE; cmd.byte2 = what; _lto3b(number, cmd.number); st->flags &= ~ST_POSUPDATED; st->last_ctl_resid = 0; error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0, 0, ST_SPC_TIME, NULL, flags); if (error == 0 && (st->flags & ST_POSUPDATED) == 0) { number = number - st->last_ctl_resid; if (what == SP_BLKS) { if (st->blkno != -1) st->blkno += number; } else if (what == SP_FILEMARKS) { if (st->fileno != -1) { st->fileno += number; if (number > 0) st->blkno = 0; else if (number < 0) st->blkno = -1; } } else if (what == SP_EOM) { st_updatefilepos(st); } } return error; } /* * write N filemarks */ static int st_write_filemarks(struct st_softc *st, int number, int flags) { int error; struct scsi_write_filemarks cmd; /* * It's hard to write a negative number of file marks. * Don't try. */ if (number < 0) { SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("EINVAL: st_write_filemarks not writing %d file marks\n", number)); 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); } memset(&cmd, 0, sizeof(cmd)); cmd.opcode = WRITE_FILEMARKS; if (SCSIPI_BUSTYPE_TYPE(scsipi_periph_bustype(st->sc_periph)) == SCSIPI_BUSTYPE_ATAPI) cmd.byte2 = SR_IMMED; /* * The ATAPI Onstream DI-30 doesn't support writing filemarks, but * WRITE_FILEMARKS is still used to flush the buffer */ if ((st->quirks & ST_Q_NOFILEMARKS) == 0) _lto3b(number, cmd.number); /* XXX WE NEED TO BE ABLE TO GET A RESIDIUAL XXX */ error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0, 0, ST_IO_TIME * 4, NULL, flags); if (error == 0 && st->fileno != -1) st->fileno += number; 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. */ static int st_check_eod(struct st_softc *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 */ static int st_load(struct st_softc *st, u_int type, int flags) { int error; struct scsi_load cmd; if (type != LD_LOAD) { int nmarks; error = st_check_eod(st, FALSE, &nmarks, flags); if (error) { aprint_error_dev(st->sc_dev, "failed to write closing filemarks at " "unload, errno=%d\n", error); return error; } } if (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); /* otherwise, we should do what's asked of us */ } memset(&cmd, 0, sizeof(cmd)); cmd.opcode = LOAD; if (SCSIPI_BUSTYPE_TYPE(scsipi_periph_bustype(st->sc_periph)) == SCSIPI_BUSTYPE_ATAPI) cmd.byte2 = SR_IMMED; cmd.how = type; error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0, ST_RETRIES, ST_SPC_TIME, NULL, flags); if (error) { aprint_error_dev(st->sc_dev, "error %d in st_load (op %d)\n", error, type); } return error; } /* Rewind the device */ static int st_rewind(struct st_softc *st, u_int immediate, int flags) { struct scsi_rewind cmd; int error; int nmarks; int timeout; error = st_check_eod(st, FALSE, &nmarks, flags); if (error) { aprint_error_dev(st->sc_dev, "failed to write closing filemarks at " "rewind, errno=%d\n", error); return error; } st->flags &= ~ST_PER_ACTION; /* If requestor asked for immediate response, set a short timeout */ timeout = immediate ? ST_CTL_TIME : ST_SPC_TIME; /* ATAPI tapes always need immediate to be set */ if (scsipi_periph_bustype(st->sc_periph) == SCSIPI_BUSTYPE_ATAPI) immediate = SR_IMMED; memset(&cmd, 0, sizeof(cmd)); cmd.opcode = REWIND; cmd.byte2 = immediate; error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0, ST_RETRIES, timeout, NULL, flags); if (error) { aprint_error_dev(st->sc_dev, "error %d trying to rewind\n", error); /* lost position */ st->fileno = st->blkno = -1; } else st->fileno = st->blkno = 0; return error; } static void st_updatefilepos(struct st_softc *st) { int error; uint8_t posdata[32]; struct scsi_tape_read_position cmd; memset(&cmd, 0, sizeof(cmd)); memset(&posdata, 0, sizeof(posdata)); cmd.opcode = READ_POSITION; cmd.byte1 = 6; /* service action: LONG FORM */ error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), (void *)&posdata, sizeof(posdata), ST_RETRIES, ST_CTL_TIME, NULL, XS_CTL_SILENT | XS_CTL_DATA_IN); if (error == 0) { #ifdef SCSIPI_DEBUG if (st->sc_periph->periph_dbflags & SCSIPI_DB3) { int hard; printf("posdata: "); for (hard = 0; hard < sizeof(posdata); hard++) printf("%02x ", posdata[hard] & 0xff); printf("\n"); } #endif if (posdata[0] & 0xC) { /* Block|Mark Position Unknown */ SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("st_updatefilepos block/mark position unknown (0x%02x)\n", posdata[0])); } else { st->fileno = _8btol(&posdata[16]); st->blkno = 0; SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("st_updatefilepos file position %"PRId64"\n", st->fileno)); return; } } else { SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("st_updatefilepos READ POSITION(LONG_FORM) failed (error=%d)\n", error)); } st->fileno = -1; st->blkno = -1; } static int st_rdpos(struct st_softc *st, int hard, uint32_t *blkptr) { int error; uint8_t posdata[20]; struct scsi_tape_read_position cmd; /* * We try and flush any buffered writes here if we were writing * and we're trying to get hardware block position. It eats * up performance substantially, but I'm wary of drive firmware. * * I think that *logical* block position is probably okay- * but hardware block position might have to wait for data * to hit media to be valid. Caveat Emptor. */ if (hard && (st->flags & ST_WRITTEN)) { /* First flush any pending writes... */ error = st_write_filemarks(st, 0, XS_CTL_SILENT); /* * The latter case is for 'write protected' tapes * which are too stupid to recognize a zero count * for writing filemarks as a no-op. */ if (error != 0 && error != EACCES && error != EROFS) return error; } memset(&cmd, 0, sizeof(cmd)); memset(&posdata, 0, sizeof(posdata)); cmd.opcode = READ_POSITION; if (hard) cmd.byte1 = 1; error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), (void *)&posdata, sizeof(posdata), ST_RETRIES, ST_CTL_TIME, NULL, XS_CTL_SILENT | XS_CTL_DATA_IN); if (error == 0) { #if 0 printf("posdata:"); for (hard = 0; hard < sizeof(posdata); hard++) printf("%02x ", posdata[hard] & 0xff); printf("\n"); #endif if (posdata[0] & 0x4) { /* Block Position Unknown */ SC_DEBUG(st->sc_periph, SCSIPI_DB3, ("EINVAL: strdpos block position unknown\n")); error = EINVAL; } else *blkptr = _4btol(&posdata[4]); } return error; } static int st_setpos(struct st_softc *st, int hard, uint32_t *blkptr) { int error; struct scsi_tape_locate cmd; /* * We used to try and flush any buffered writes here. * Now we push this onto user applications to either * flush the pending writes themselves (via a zero count * WRITE FILEMARKS command) or they can trust their tape * drive to do this correctly for them. * * There are very ugly performance limitations otherwise. */ memset(&cmd, 0, sizeof(cmd)); cmd.opcode = LOCATE; if (hard) cmd.byte2 = 1 << 2; _lto4b(*blkptr, cmd.blkaddr); error = scsipi_command(st->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0, ST_RETRIES, ST_SPC_TIME, NULL, 0); /* * Note file && block number position now unknown (if * these things ever start being maintained in this driver) */ st->fileno = st->blkno = -1; return error; } /* * Look at the returned sense and act on the error and determine * the unix error number to pass back..., 0 (== report no error), * -1 = retry the operation, -2 continue error processing. */ static int st_interpret_sense(struct scsipi_xfer *xs) { struct scsipi_periph *periph = xs->xs_periph; struct scsi_sense_data *sense = &xs->sense.scsi_sense; struct buf *bp = xs->bp; struct st_softc *st = device_private(periph->periph_dev); int retval = EJUSTRETURN; int doprint = ((xs->xs_control & XS_CTL_SILENT) == 0); uint8_t key; int32_t info; /* * If it isn't a extended or extended/deferred error, let * the generic code handle it. */ if (SSD_RCODE(sense->response_code) != SSD_RCODE_CURRENT && SSD_RCODE(sense->response_code) != SSD_RCODE_DEFERRED) return retval; if (sense->response_code & SSD_RCODE_VALID) info = _4btol(sense->info); else info = (st->flags & ST_FIXEDBLOCKS) ? xs->datalen / st->blksize : xs->datalen; key = SSD_SENSE_KEY(sense->flags); st->mt_erreg = key; st->asc = sense->asc; st->ascq = sense->ascq; st->mt_resid = (short) info; if (key == SKEY_NOT_READY && st->asc == 0x4 && st->ascq == 0x1) { /* Not Ready, Logical Unit Is in Process Of Becoming Ready */ if (!callout_pending(&periph->periph_callout)) scsipi_periph_freeze(periph, 1); callout_reset(&periph->periph_callout, hz, scsipi_periph_timed_thaw, periph); return ERESTART; } /* If the device is not open yet, let generic handle */ if ((periph->periph_flags & PERIPH_OPEN) == 0) return retval; xs->resid = info; if (st->flags & ST_FIXEDBLOCKS) { if (bp) { xs->resid *= st->blksize; st->last_io_resid = xs->resid; } else st->last_ctl_resid = xs->resid; if (key == SKEY_VOLUME_OVERFLOW) { st->flags |= ST_EIO_PENDING; if (bp) bp->b_resid = xs->resid; } else if (sense->flags & SSD_EOM) { if ((st->flags & ST_EARLYWARN) == 0) st->flags |= ST_EIO_PENDING; st->flags |= ST_EOM_PENDING; if (bp) { #if 0 bp->b_resid = xs->resid; #else /* * Grotesque as it seems, the few times * I've actually seen a non-zero resid, * the tape drive actually lied and had * written all the data! */ bp->b_resid = 0; #endif } } if (sense->flags & SSD_FILEMARK) { st->flags |= ST_AT_FILEMARK; if (bp) bp->b_resid = xs->resid; if (st->fileno != (daddr_t) -1) { st->fileno++; st->blkno = 0; st->flags |= ST_POSUPDATED; } } if (sense->flags & SSD_ILI) { st->flags |= ST_EIO_PENDING; if (bp) bp->b_resid = xs->resid; if (sense->response_code & SSD_RCODE_VALID && (xs->xs_control & XS_CTL_SILENT) == 0) aprint_error_dev(st->sc_dev, "block wrong size, %d blocks residual\n", 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) && (periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) st->blksize -= 512; else if ((st->flags & ST_POSUPDATED) == 0) { if (st->blkno != (daddr_t) -1) { st->blkno += (xs->datalen / st->blksize); st->flags |= ST_POSUPDATED; } } } /* * If data wanted and no data was transferred, do it immediately */ if (xs->datalen && 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 */ if (bp) st->last_io_resid = xs->resid; else st->last_ctl_resid = xs->resid; if (sense->flags & SSD_EOM) { /* * The current semantics of this * driver requires EOM detection * to return EIO unless early * warning detection is enabled * for variable mode (this is always * on for fixed block mode). */ if (st->flags & ST_EARLYWARN) { st->flags |= ST_EOM_PENDING; retval = 0; } else { retval = EIO; /* * If we return an error we can't claim to * have transfered all data. */ if (xs->resid == 0) xs->resid = xs->datalen; } /* * If it's an unadorned EOM detection, * suppress printing an error. */ if (key == SKEY_NO_SENSE) { doprint = 0; } } else if (sense->flags & SSD_FILEMARK) { retval = 0; if (st->fileno != (daddr_t) -1) { st->fileno++; st->blkno = 0; st->flags |= ST_POSUPDATED; } } else if (sense->flags & SSD_ILI) { if (info < 0) { /* * The tape record was bigger than the read * we issued. */ if ((xs->xs_control & XS_CTL_SILENT) == 0) { aprint_error_dev(st->sc_dev, "%d-byte tape record too big" " for %d-byte user buffer\n", xs->datalen - info, xs->datalen); } retval = EIO; } else { retval = 0; if (st->blkno != (daddr_t) -1) { st->blkno++; st->flags |= ST_POSUPDATED; } } } if (bp) bp->b_resid = xs->resid; } #ifndef SCSIPI_DEBUG if (retval == 0 && key == SKEY_NO_SENSE) doprint = 0; #endif if (key == 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 ((st->quirks & ST_Q_SENSE_HELP) && (periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) { /* still starting */ st->blksize -= 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 */ } retval = 0; /* lost position */ st->fileno = st->blkno = -1; } } /* * If generic sense processing will continue, we should not * print sense info here. */ if (retval == EJUSTRETURN) doprint = 0; if (doprint) { /* Print verbose sense info if possible */ if (scsipi_print_sense(xs, 0) != 0) return retval; /* Print less-verbose sense info */ scsipi_printaddr(periph); printf("Sense Key 0x%02x", key); if ((sense->response_code & SSD_RCODE_VALID) != 0) { switch (key) { case SKEY_NOT_READY: case SKEY_ILLEGAL_REQUEST: case SKEY_UNIT_ATTENTION: case SKEY_DATA_PROTECT: break; case SKEY_VOLUME_OVERFLOW: case SKEY_BLANK_CHECK: printf(", requested size: %d (decimal)", info); break; case SKEY_ABORTED_COMMAND: if (xs->xs_retries) printf(", retrying"); printf(", cmd 0x%x, info 0x%x", xs->cmd->opcode, info); break; default: printf(", info = %d (decimal)", info); } } if (sense->extra_len != 0) { int n; printf(", data ="); for (n = 0; n < sense->extra_len; n++) printf(" %02x", sense->csi[n]); } printf("\n"); } return retval; } /* * The quirk here is that the drive returns some value to st_mode_sense * incorrectly until the tape has actually passed by the head. * * The method is to set the drive to large fixed-block state (user-specified * density and 1024-byte blocks), then read and rewind to get it to sense the * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't * work, as a last resort, try variable- length blocks. The result will be * the ability to do an accurate st_mode_sense. * * We know we can do a rewind because we just did a load, which implies rewind. * Rewind seems preferable to space backward if we have a virgin tape. * * The rest of the code for this quirk is in ILI processing and BLANK CHECK * error processing, both part of st_interpret_sense. */ static int st_touch_tape(struct st_softc *st) { char *bf; int readsize; int error; bf = malloc(1024, M_TEMP, M_NOWAIT); if (bf == NULL) return ENOMEM; if ((error = st->ops(st, ST_OPS_MODESENSE, 0)) != 0) goto bad; /* * If the block size is already known from the * sense data, use it. Else start probing at 1024. */ if (st->media_blksize > 0) st->blksize = st->media_blksize; else st->blksize = 1024; do { switch (st->blksize) { case 512: case 1024: readsize = st->blksize; st->flags |= ST_FIXEDBLOCKS; break; default: readsize = 1; st->flags &= ~ST_FIXEDBLOCKS; } if ((error = st->ops(st, ST_OPS_MODESELECT, XS_CTL_SILENT)) != 0) { /* * The device did not agree with the proposed * block size. If we exhausted our options, * return failure, else try another. */ if (readsize == 1) goto bad; st->blksize -= 512; continue; } st_read(st, bf, readsize, XS_CTL_SILENT); /* XXX */ if ((error = st_rewind(st, 0, 0)) != 0) { bad: free(bf, M_TEMP); return error; } } while (readsize != 1 && readsize > st->blksize); free(bf, M_TEMP); return 0; } static int stdump(dev_t dev, daddr_t blkno, void *va, size_t size) { /* Not implemented. */ return ENXIO; } /* * Send a filled out parameter structure to the drive to * set it into the desire modes etc. */ int st_mode_select(struct st_softc *st, int flags) { u_int select_len; struct select { struct scsi_mode_parameter_header_6 header; struct scsi_general_block_descriptor blk_desc; u_char sense_data[MAX_PAGE_0_SIZE]; } select; struct scsipi_periph *periph = st->sc_periph; select_len = sizeof(select.header) + sizeof(select.blk_desc) + st->page_0_size; /* * 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 (st->quirks & ST_Q_UNIMODAL) { SC_DEBUG(periph, SCSIPI_DB3, ("not setting density 0x%x blksize 0x%x\n", st->density, st->blksize)); return 0; } /* Set up for a mode select */ memset(&select, 0, sizeof(select)); select.header.blk_desc_len = sizeof(struct scsi_general_block_descriptor); select.header.dev_spec &= ~SMH_DSP_BUFF_MODE; select.blk_desc.density = st->density; if (st->flags & ST_DONTBUFFER) select.header.dev_spec |= SMH_DSP_BUFF_MODE_OFF; else select.header.dev_spec |= SMH_DSP_BUFF_MODE_ON; if (st->flags & ST_FIXEDBLOCKS) _lto3b(st->blksize, select.blk_desc.blklen); if (st->page_0_size) memcpy(select.sense_data, st->sense_data, st->page_0_size); /* do the command */ return scsipi_mode_select(periph, 0, &select.header, select_len, flags, ST_RETRIES, ST_CTL_TIME); }