/* $OpenBSD: st.c,v 1.91 2010/01/12 23:33:57 dlg 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 #include /* Defines for device specific stuff */ #define DEF_FIXED_BSIZE 512 #define STMODE(z) ( minor(z) & 0x03) #define STUNIT(z) ((minor(z) >> 4) ) #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 modes { u_int quirks; /* same definitions as in quirkdata */ int blksize; u_int8_t density; }; struct quirkdata { u_int quirks; #define ST_Q_FORCE_BLKSIZE 0x0001 #define ST_Q_SENSE_HELP 0x0002 /* must do READ for good MODE SENSE */ #define ST_Q_IGNORE_LOADS 0x0004 #define ST_Q_BLKSIZE 0x0008 /* variable-block media_blksize > 0 */ #define ST_Q_UNIMODAL 0x0010 /* unimode drive rejects mode select */ struct modes modes; }; 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, {ST_Q_FORCE_BLKSIZE, 512, 0}}}, /* minor 0-3 */ {{T_SEQUENTIAL, T_REMOV, "TANDBERG", " TDC 3600 ", ""}, {0, {0, 0, 0}}}, /* minor 0-3 */ {{T_SEQUENTIAL, T_REMOV, "TANDBERG", " TDC 3800 ", ""}, {0, {ST_Q_FORCE_BLKSIZE, 512, 0}}}, /* minor 0-3 */ /* * 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, {ST_Q_SENSE_HELP, 0, 0}}}, /* minor 0-3 */ /* * One user reports that this works for his tape drive. It probably * needs more work. - mycroft, 09APR1994 */ {{T_SEQUENTIAL, T_REMOV, "SANKYO ", "CP525 ", ""}, {0, {ST_Q_FORCE_BLKSIZE, 512, 0}}}, /* minor 0-3 */ {{T_SEQUENTIAL, T_REMOV, "ANRITSU ", "DMT780 ", ""}, {0, {ST_Q_FORCE_BLKSIZE, 512, 0}}}, /* minor 0-3 */ {{T_SEQUENTIAL, T_REMOV, "ARCHIVE ", "VIPER 150 21247", ""}, {0, {0, 0, 0}}}, /* minor 0-3 */ {{T_SEQUENTIAL, T_REMOV, "ARCHIVE ", "VIPER 150 21531", ""}, {0, {ST_Q_SENSE_HELP, 0, 0}}}, /* minor 0-3 */ {{T_SEQUENTIAL, T_REMOV, "WANGTEK ", "5099ES SCSI", ""}, {0, {ST_Q_FORCE_BLKSIZE, 512, 0}}}, /* minor 0-3 */ {{T_SEQUENTIAL, T_REMOV, "WANGTEK ", "5150ES SCSI", ""}, {0, {ST_Q_FORCE_BLKSIZE, 512, 0}}}, /* minor 0-3 */ {{T_SEQUENTIAL, T_REMOV, "WANGTEK ", "5525ES SCSI REV7", ""}, {0, {0, 0, 0}}}, /* minor 0-3 */ {{T_SEQUENTIAL, T_REMOV, "WangDAT ", "Model 1300 ", ""}, {0, {0, 0, 0}}}, /* minor 0-3 */ {{T_SEQUENTIAL, T_REMOV, "EXABYTE ", "EXB-8200 ", "263H"}, {0, {0, 0, 0}}}, /* minor 0-3 */ {{T_SEQUENTIAL, T_REMOV, "HP ", "T4000s ", ""}, {ST_Q_UNIMODAL, {0, 0, QIC_3095}}}, /* minor 0-3 */ #if 0 {{T_SEQUENTIAL, T_REMOV, "EXABYTE ", "EXB-8200 ", ""}, {0, {0, 0, 0}}}, /* minor 0-3 */ #endif {{T_SEQUENTIAL, T_REMOV, "WANGTEK ", "5150ES SCSI FA15\0""01 A", "????"}, {0, {ST_Q_IGNORE_LOADS, 0, 0}}}, /* minor 0-3 */ {{T_SEQUENTIAL, T_REMOV, "TEAC ", "MT-2ST/N50 ", ""}, {ST_Q_IGNORE_LOADS, {0, 0, 0}}}, /* minor 0-3 */ }; #define NOEJECT 0 #define EJECT 1 #define NOREWIND 0 #define DOREWIND 1 struct st_softc { struct device sc_dev; int flags; /* see below */ 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 adpter etc. */ int blkmin; /* min blk size */ int blkmax; /* max blk size */ const struct quirkdata *quirkdata; /* if we have a rogue entry */ u_int64_t numblks; /* nominal blocks capacity */ 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. */ u_int drive_quirks; /* quirks of this drive */ struct modes modes; /* plus more for each mode */ u_int8_t modeflags; /* flags for the modes */ #define DENSITY_SET_BY_USER 0x01 #define DENSITY_SET_BY_QUIRK 0x02 #define BLKSIZE_SET_BY_USER 0x04 #define BLKSIZE_SET_BY_QUIRK 0x08 struct buf buf_queue; /* the queue of pending IO operations */ struct timeout sc_timeout; struct mutex sc_buf_mtx; struct mutex sc_start_mtx; u_int sc_start_count; }; 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 st_kill_buffers(struct st_softc *); void st_identify_drive(struct st_softc *, struct scsi_inquiry_data *); void st_loadquirks(struct st_softc *); int st_mount_tape(dev_t, int); void st_unmount(struct st_softc *, int, int); int st_decide_mode(struct st_softc *, int); void ststart(void *); struct buf *st_buf_dequeue(struct st_softc *); void st_buf_enqueue(struct st_softc *, struct buf *); void st_buf_requeue(struct st_softc *, struct buf *); 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); struct cfattach st_ca = { sizeof(struct st_softc), stmatch, stattach, stdetach, stactivate }; struct cfdriver st_cd = { NULL, "st", DV_TAPE }; struct scsi_device st_switch = { st_interpret_sense, ststart, NULL, NULL, }; #define ST_INFO_VALID 0x0001 #define ST_BLOCK_SET 0x0002 /* block size, mode set by ioctl */ #define ST_WRITTEN 0x0004 /* data have been written, EOD needed */ #define ST_FIXEDBLOCKS 0x0008 #define ST_AT_FILEMARK 0x0010 #define ST_EIO_PENDING 0x0020 /* we couldn't report it then (had data) */ #define ST_READONLY 0x0080 /* st_mode_sense says write protected */ #define ST_FM_WRITTEN 0x0100 /* * EOF file mark written -- used with * ~ST_WRITTEN to indicate that multiple file * marks have been written */ #define ST_DYING 0x40 /* dying, when deactivated */ #define ST_BLANK_READ 0x0200 /* BLANK CHECK encountered already */ #define ST_2FM_AT_EOD 0x0400 /* write 2 file marks at EOD */ #define ST_MOUNTED 0x0800 /* Device is presently mounted */ #define ST_DONTBUFFER 0x1000 /* Disable buffering/caching */ #define ST_WAITING 0x2000 #define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ) #define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \ ST_FIXEDBLOCKS | ST_READONLY | ST_FM_WRITTEN | \ ST_2FM_AT_EOD | ST_PER_ACTION) #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; int priority; (void)scsi_inqmatch(sa->sa_inqbuf, st_patterns, sizeof(st_patterns)/sizeof(st_patterns[0]), 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) { struct st_softc *st = (void *)self; struct scsi_attach_args *sa = aux; struct scsi_link *sc_link = sa->sa_sc_link; SC_DEBUG(sc_link, SDEV_DB2, ("stattach:\n")); /* * Store information needed to contact our base driver */ st->sc_link = sc_link; sc_link->device = &st_switch; sc_link->device_softc = st; /* * 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); printf("\n"); mtx_init(&st->sc_buf_mtx, IPL_BIO); mtx_init(&st->sc_start_mtx, IPL_BIO); timeout_set(&st->sc_timeout, ststart, st); /* * Set up the buf queue for this device */ st->buf_queue.b_active = 0; st->buf_queue.b_actf = 0; st->buf_queue.b_actb = &st->buf_queue.b_actf; /* Start up with media position unknown. */ st->media_fileno = -1; st->media_blkno = -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. */ sc_link->flags &= ~SDEV_MEDIA_LOADED; } int stactivate(struct device *self, int act) { struct st_softc *st = (struct st_softc *)self; int rv = 0; switch (act) { case DVACT_ACTIVATE: break; case DVACT_DEACTIVATE: st->flags |= ST_DYING; st_kill_buffers(st); break; } return (rv); } int stdetach(struct device *self, int flags) { struct st_softc *st = (struct st_softc *)self; int bmaj, cmaj, mn; st_kill_buffers(st); /* Locate the lowest minor number to be detached. */ mn = STUNIT(self->dv_unit); for (bmaj = 0; bmaj < nblkdev; bmaj++) if (bdevsw[bmaj].d_open == stopen) { vdevgone(bmaj, mn, mn + 0, VBLK); vdevgone(bmaj, mn, mn + 1, VBLK); vdevgone(bmaj, mn, mn + 2, VBLK); vdevgone(bmaj, mn, mn + 3, VBLK); } for (cmaj = 0; cmaj < nchrdev; cmaj++) if (cdevsw[cmaj].d_open == stopen) { vdevgone(cmaj, mn, mn + 0, VCHR); vdevgone(cmaj, mn, mn + 1, VCHR); vdevgone(cmaj, mn, mn + 2, VCHR); vdevgone(cmaj, mn, mn + 3, VCHR); } return (0); } /* * Use the inquiry routine in 'scsi_base' to get drive info so we can * Further tailor our behaviour. */ void st_identify_drive(struct st_softc *st, struct scsi_inquiry_data *inqbuf) { const struct st_quirk_inquiry_pattern *finger; int priority; finger = (const struct st_quirk_inquiry_pattern *)scsi_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_loadquirks(st); } } /* * initialise the subdevices to the default (QUIRK) state. * this will remove any setting made by the system operator or previous * operations. */ void st_loadquirks(struct st_softc *st) { const struct modes *mode; struct modes *mode2; mode = &st->quirkdata->modes; mode2 = &st->modes; bzero(mode2, sizeof(struct modes)); st->modeflags &= ~(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 |= BLKSIZE_SET_BY_QUIRK; } if (mode->density) { mode2->density = mode->density; st->modeflags |= DENSITY_SET_BY_QUIRK; } } /* * open the device. */ int stopen(dev_t dev, int flags, int fmt, struct proc *p) { struct scsi_link *sc_link; struct st_softc *st; int error = 0; st = stlookup(STUNIT(dev)); if (st == NULL) return (ENXIO); if (st->flags & ST_DYING) { error = ENXIO; goto done; } sc_link = st->sc_link; SC_DEBUG(sc_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 (sc_link->flags & SDEV_OPEN) { SC_DEBUG(sc_link, SDEV_DB4, ("already open\n")); error = EBUSY; goto done; } /* Use st_interpret_sense() now. */ sc_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(sc_link, TEST_READY_RETRIES, SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE | SCSI_IGNORE_ILLEGAL_REQUEST); /* * Terminate any exising mount session if there is no media. */ if ((sc_link->flags & SDEV_MEDIA_LOADED) == 0) st_unmount(st, NOEJECT, DOREWIND); if (error) { sc_link->flags &= ~SDEV_OPEN; goto done; } if ((st->flags & ST_MOUNTED) == 0) { error = st_mount_tape(dev, flags); if (error) { sc_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) st->flags |= ST_WRITTEN; done: SC_DEBUG(sc_link, SDEV_DB2, ("open complete\n")); 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 *sc_link; struct st_softc *st; int error = 0; st = stlookup(STUNIT(dev)); if (st == NULL) return (ENXIO); if (st->flags & ST_DYING) { error = ENXIO; goto done; } sc_link = st->sc_link; SC_DEBUG(sc_link, SDEV_DB1, ("closing\n")); if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) st_write_filemarks(st, 1, 0); switch (STMODE(dev)) { case 0: /* normal */ st_unmount(st, NOEJECT, DOREWIND); break; case 3: /* eject, no rewind */ st_unmount(st, EJECT, NOREWIND); break; case 1: /* no rewind */ /* leave mounted unless media seems to have been removed */ if (!(sc_link->flags & SDEV_MEDIA_LOADED)) st_unmount(st, NOEJECT, NOREWIND); break; case 2: /* rewind, eject */ st_unmount(st, EJECT, DOREWIND); break; } sc_link->flags &= ~SDEV_OPEN; timeout_del(&st->sc_timeout); done: device_unref(&st->sc_dev); 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. */ int st_mount_tape(dev_t dev, int flags) { struct st_softc *st; struct scsi_link *sc_link; int error = 0; st = stlookup(STUNIT(dev)); if (st == NULL) return (ENXIO); if (st->flags & ST_DYING) { error = ENXIO; goto done; } sc_link = st->sc_link; SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n")); if (st->flags & ST_MOUNTED) goto done; st->quirks = st->drive_quirks | st->modes.quirks; /* * If the media is new, then make sure we give it a chance to * to do a 'load' instruction. (We assume it is new.) */ if ((error = st_load(st, LD_LOAD, 0)) != 0) goto done; /* * Throw another dummy instruction to catch * 'Unit attention' errors. Some drives appear to give * these after doing a Load instruction. * (noteably some DAT drives) */ /* XXX */ scsi_test_unit_ready(sc_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 (st->quirks & ST_Q_SENSE_HELP) if ((error = st_touch_tape(st)) != 0) return error; /* * Load the physical device parameters * loads: blkmin, blkmax */ if (!(sc_link->flags & SDEV_ATAPI) && (error = st_read_block_limits(st, 0)) != 0) goto done; /* * 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_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 (st->modeflags & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) st->density = st->modes.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 & (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) { st->blksize = st->modes.blksize; if (st->blksize) st->flags |= ST_FIXEDBLOCKS; } else { if ((error = st_decide_mode(st, FALSE)) != 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(sc_link, PR_PREVENT, SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); st->flags |= ST_MOUNTED; sc_link->flags |= SDEV_MEDIA_LOADED; /* move earlier? */ done: device_unref(&st->sc_dev); 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 *sc_link = st->sc_link; int nmarks; st->media_fileno = -1; st->media_blkno = -1; if (!(st->flags & ST_MOUNTED)) return; SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); st_check_eod(st, FALSE, &nmarks, SCSI_IGNORE_NOT_READY); if (rewind) st_rewind(st, 0, SCSI_IGNORE_NOT_READY); scsi_prevent(sc_link, PR_ALLOW, SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); if (eject) st_load(st, LD_UNLOAD, SCSI_IGNORE_NOT_READY); st->flags &= ~ST_MOUNTED; sc_link->flags &= ~SDEV_MEDIA_LOADED; } /* * Given all we know about the device, media, mode, 'quirks' and * initial operation, make a decision as to how we should be set * to run (regarding blocking and EOD marks) */ int st_decide_mode(struct st_softc *st, int first_read) { struct scsi_link *sc_link = st->sc_link; SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n")); /* ATAPI tapes are always fixed blocksize. */ if (sc_link->flags & SDEV_ATAPI) { 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)) { st->flags |= ST_FIXEDBLOCKS; st->blksize = st->blkmin; SC_DEBUG(sc_link, SDEV_DB3, ("blkmin == blkmax of %d\n", st->blkmin)); goto done; } /* * If the tape density mandates (or even suggests) use of fixed * or variable-length blocks, comply. */ switch (st->density) { case HALFINCH_800: case HALFINCH_1600: case HALFINCH_6250: case DDS: st->flags &= ~ST_FIXEDBLOCKS; st->blksize = 0; SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n")); goto done; case QIC_11: case QIC_24: case QIC_120: case QIC_150: case QIC_525: case QIC_1320: st->flags |= ST_FIXEDBLOCKS; if (st->media_blksize > 0) st->blksize = st->media_blksize; else st->blksize = DEF_FIXED_BSIZE; SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n")); goto done; } /* * If we're about to read the tape, perhaps we should choose * fixed or variable-length blocks and block size according to * what the drive found on the tape. */ if (first_read && (!(st->quirks & ST_Q_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(sc_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. */ st->flags &= ~ST_FIXEDBLOCKS; st->blksize = 0; SC_DEBUG(sc_link, SDEV_DB3, ("Give up and default to variable mode\n")); done: /* * Decide whether or not to write two file marks to signify end- * of-data. Make the decision as a function of density. If * the decision is not to use a second file mark, the SCSI BLANK * CHECK condition code will be recognized as end-of-data when * first read. * (I think this should be a by-product of fixed/variable..julian) */ switch (st->density) { /* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ case QIC_11: case QIC_24: case QIC_120: case QIC_150: case QIC_525: case QIC_1320: st->flags &= ~ST_2FM_AT_EOD; break; default: st->flags |= ST_2FM_AT_EOD; } return 0; } /* * 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 *sc_link; struct st_softc *st; int error, s; st = stlookup(STUNIT(bp->b_dev)); if (st == NULL) return; if (st->flags & ST_DYING) { error = ENXIO; goto done; } sc_link = st->sc_link; SC_DEBUG(sc_link, SDEV_DB2, ("ststrategy: %ld bytes @ blk %d\n", bp->b_bcount, bp->b_blkno)); if (st->flags & ST_DYING) { bp->b_error = ENXIO; goto bad; } /* * If it's a null transfer, return immediately. */ if (bp->b_bcount == 0) goto done; /* * Odd sized request on fixed drives are verboten */ if (st->flags & ST_FIXEDBLOCKS) { if (bp->b_bcount % st->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())) */ st_buf_enqueue(st, 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(st); device_unref(&st->sc_dev); return; bad: bp->b_flags |= B_ERROR; done: device_unref(&st->sc_dev); /* * Correctly set the buf to indicate a completed xfer */ bp->b_resid = bp->b_bcount; s = splbio(); biodone(bp); splx(s); } void st_buf_enqueue(struct st_softc *st, struct buf *bp) { struct buf *dp; mtx_enter(&st->sc_buf_mtx); dp = &st->buf_queue; bp->b_actf = NULL; bp->b_actb = dp->b_actb; *dp->b_actb = bp; dp->b_actb = &bp->b_actf; mtx_leave(&st->sc_buf_mtx); } struct buf * st_buf_dequeue(struct st_softc *st) { struct buf *bp; mtx_enter(&st->sc_buf_mtx); bp = st->buf_queue.b_actf; if (bp != NULL) st->buf_queue.b_actf = bp->b_actf; if (st->buf_queue.b_actf == NULL) st->buf_queue.b_actb = &st->buf_queue.b_actf; mtx_leave(&st->sc_buf_mtx); return (bp); } void st_buf_requeue(struct st_softc *st, struct buf *bp) { mtx_enter(&st->sc_buf_mtx); bp->b_actf = st->buf_queue.b_actf; st->buf_queue.b_actf = bp; if (bp->b_actf == NULL) st->buf_queue.b_actb = &bp->b_actf; mtx_leave(&st->sc_buf_mtx); } /* * ststart looks to see if there is a buf waiting for the device * and that the device is not already busy. If both are true, * It dequeues the buf and creates a scsi command to perform the * transfer required. The transfer request will call scsi_done * on completion, which will in turn call this routine again * so that the next queued transfer is performed. * The bufs are queued by the strategy routine (ststrategy) * * This routine is also called after other non-queued requests * have been made of the scsi driver, to ensure that the queue * continues to be drained. * ststart() is called at splbio from ststrategy and scsi_done() */ void ststart(void *v) { struct st_softc *st = v; struct scsi_link *sc_link = st->sc_link; struct buf *bp; struct scsi_rw_tape *cmd; struct scsi_xfer *xs; int s; SC_DEBUG(sc_link, SDEV_DB2, ("ststart\n")); if (st->flags & ST_DYING) return; mtx_enter(&st->sc_start_mtx); st->sc_start_count++; if (st->sc_start_count > 1) { mtx_leave(&st->sc_start_mtx); return; } mtx_leave(&st->sc_start_mtx); CLR(st->flags, ST_WAITING); restart: while (!ISSET(st->flags, ST_WAITING) && (bp = st_buf_dequeue(st)) != NULL) { /* * if the device has been unmounted by the user * then throw away all requests until done */ if (!(st->flags & ST_MOUNTED) || !(sc_link->flags & SDEV_MEDIA_LOADED)) { /* make sure that one implies the other.. */ sc_link->flags &= ~SDEV_MEDIA_LOADED; bp->b_flags |= B_ERROR; bp->b_resid = bp->b_bcount; bp->b_error = EIO; s = splbio(); biodone(bp); splx(s); continue; } xs = scsi_xs_get(sc_link, SCSI_NOSLEEP); if (xs == NULL) { st_buf_requeue(st, bp); break; } /* * only FIXEDBLOCK devices have pending operations */ if (st->flags & ST_FIXEDBLOCKS) { /* * If we are at a filemark but have not reported it yet * then we should report it now */ if (st->flags & ST_AT_FILEMARK) { if ((bp->b_flags & B_READ) == B_WRITE) { /* * Handling of ST_AT_FILEMARK in * st_space will fill in the right file * mark count. * Back up over filemark */ if (st_space(st, 0, SP_FILEMARKS, 0)) { bp->b_flags |= B_ERROR; bp->b_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; bp->b_flags &= ~B_ERROR; st->flags &= ~ST_AT_FILEMARK; s = splbio(); biodone(bp); splx(s); continue; /* seek more work */ } } /* * If we are at EIO (e.g. EOM) but have not reported it * yet then we should report it now */ if (st->flags & ST_EIO_PENDING) { bp->b_resid = bp->b_bcount; bp->b_error = EIO; bp->b_flags |= B_ERROR; st->flags &= ~ST_EIO_PENDING; s = splbio(); biodone(bp); splx(s); continue; /* seek more work */ } } /* * 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; st->flags &= ~ST_FM_WRITTEN; st->flags |= ST_WRITTEN; xs->flags |= SCSI_DATA_OUT; } else { cmd->opcode = READ; xs->flags |= SCSI_DATA_IN; } /* * Handle "fixed-block-mode" tape drives by using the * block count instead of the length. */ if (st->flags & ST_FIXEDBLOCKS) { cmd->byte2 |= SRW_FIXED; _lto3b(bp->b_bcount / st->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 (st->flags & ST_FIXEDBLOCKS) st->media_blkno += _3btol(cmd->len); else if (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; /* * go ask the adapter to do all this for us */ scsi_xs_exec(xs); } /* go back and see if we can cram more work in.. */ mtx_enter(&st->sc_start_mtx); st->sc_start_count--; if (st->sc_start_count != 0) { st->sc_start_count = 1; mtx_leave(&st->sc_start_mtx); goto restart; } mtx_leave(&st->sc_start_mtx); } void st_buf_done(struct scsi_xfer *xs) { struct st_softc *st = xs->sc_link->device_softc; struct buf *bp = xs->cookie; splassert(IPL_BIO); switch (xs->error) { case XS_NOERROR: bp->b_error = 0; bp->b_resid = xs->resid; break; case XS_NO_CCB: /* The adapter is busy, requeue the buf and try it later. */ st_buf_requeue(st, bp); scsi_xs_put(xs); SET(st->flags, ST_WAITING); /* break out of cdstart loop */ timeout_add(&st->sc_timeout, 1); return; case XS_SENSE: case XS_SHORTSENSE: if (scsi_interpret_sense(xs) != ERESTART) xs->retries = 0; /* FALLTHROUGH */ case XS_BUSY: case XS_TIMEOUT: if (xs->retries--) { scsi_xs_exec(xs); return; } /* FALLTHROUGH */ default: bp->b_error = EIO; bp->b_flags |= B_ERROR; bp->b_resid = bp->b_bcount; break; } biodone(bp); scsi_xs_put(xs); ststart(st); /* restart io */ } void stminphys(struct buf *bp) { struct st_softc *st; st = stlookup(STUNIT(bp->b_dev)); if (st == NULL) return; /* can't happen */ (*st->sc_link->adapter->scsi_minphys)(bp, st->sc_link); device_unref(&st->sc_dev); } int stread(dev_t dev, struct uio *uio, int iomode) { struct st_softc *st; st = stlookup(STUNIT(dev)); if (st == NULL) return (ENXIO); if (st->flags & ST_DYING) { device_unref(&st->sc_dev); return (ENXIO); } return (physio(ststrategy, NULL, dev, B_READ, stminphys, uio)); } int stwrite(dev_t dev, struct uio *uio, int iomode) { struct st_softc *st; st = stlookup(STUNIT(dev)); if (st == NULL) return (ENXIO); if (st->flags & ST_DYING) { device_unref(&st->sc_dev); return (ENXIO); } return (physio(ststrategy, NULL, 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 (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) 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->modes.blksize; g->mt_mdensity = st->modes.density; 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; 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, 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, DOREWIND); 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 */ 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 */ if (number < 0 || number > SCSI_MAX_DENSITY_CODE) { error = EINVAL; break; } else 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 default: error = scsi_do_ioctl(st->sc_link, dev, cmd, arg, flag, p); 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) st->flags |= ST_FIXEDBLOCKS; else 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->modes.blksize = st->blksize; st->modeflags |= BLKSIZE_SET_BY_USER; break; case MTSETDNSTY: st->modes.density = st->density; st->modeflags |= DENSITY_SET_BY_USER; 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; /* * If it's a null transfer, return immediately */ if (size == 0) return 0; bzero(&cmd, 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 scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), (u_char *) buf, size, 0, ST_IO_TIME, NULL, flags | SCSI_DATA_IN); } /* * 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 cmd; struct scsi_block_limits_data block_limits; struct scsi_link *sc_link = st->sc_link; int error; /* * First check if we have it all loaded */ if ((sc_link->flags & SDEV_MEDIA_LOADED)) return 0; /* * do a 'Read Block Limits' */ bzero(&cmd, sizeof(cmd)); cmd.opcode = READ_BLOCK_LIMITS; /* * do the command, update the global values */ error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), (u_char *) &block_limits, sizeof(block_limits), SCSI_RETRIES, ST_CTL_TIME, NULL, flags | SCSI_DATA_IN); if (error) return error; st->blkmin = _2btol(block_limits.min_length); st->blkmax = _3btol(block_limits.max_length); SC_DEBUG(sc_link, SDEV_DB3, ("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax)); return 0; } /* * Get the scsi driver to send a full inquiry to the * device and use the results to fill out the global * parameter structure. * * called from: * attach * open * ioctl (to reset original blksize) */ int st_mode_sense(struct st_softc *st, int flags) { union scsi_mode_sense_buf *data; struct scsi_link *sc_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, big; data = malloc(sizeof(*data), M_TEMP, M_NOWAIT); if (data == NULL) return (ENOMEM); /* * Ask for page 0 (vendor specific) mode sense data. */ error = scsi_do_mode_sense(sc_link, 0, data, (void **)&page0, &density, &block_count, &block_size, 1, flags | SCSI_SILENT, &big); if (error != 0) { free(data, M_TEMP); return (error); } /* 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 (dev_spec & SMH_DSP_WRITE_PROT) st->flags |= ST_READONLY; else st->flags &= ~ST_READONLY; st->numblks = block_count; st->media_blksize = block_size; st->media_density = density; SC_DEBUG(sc_link, SDEV_DB3, ("density code 0x%x, %d-byte blocks, write-%s, ", st->media_density, st->media_blksize, st->flags & ST_READONLY ? "protected" : "enabled")); SC_DEBUGN(sc_link, SDEV_DB3, ("%sbuffered\n", dev_spec & SMH_DSP_BUFF_MODE ? "" : "un")); sc_link->flags |= SDEV_MEDIA_LOADED; free(data, M_TEMP); return (0); } /* * 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) { union scsi_mode_sense_buf *inbuf, *outbuf; struct scsi_blk_desc general; struct scsi_link *sc_link = st->sc_link; u_int8_t *page0 = NULL; int error, big, page0_size; inbuf = malloc(sizeof(*inbuf), M_TEMP, M_NOWAIT); if (inbuf == NULL) return (ENOMEM); outbuf = malloc(sizeof(*outbuf), M_TEMP, M_NOWAIT | M_ZERO); if (outbuf == NULL) { free(inbuf, M_TEMP); return (ENOMEM); } /* * 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(sc_link, SDEV_DB3, ("not setting density 0x%x blksize 0x%x\n", st->density, st->blksize)); free(inbuf, M_TEMP); free(outbuf, M_TEMP); return (0); } if (sc_link->flags & SDEV_ATAPI) { free(inbuf, M_TEMP); free(outbuf, M_TEMP); return (0); } bzero(&general, sizeof(general)); general.density = st->density; if (st->flags & ST_FIXEDBLOCKS) _lto3b(st->blksize, general.blklen); /* * Ask for page 0 (vendor specific) mode sense data. */ error = scsi_do_mode_sense(sc_link, 0, inbuf, (void **)&page0, NULL, NULL, NULL, 1, flags | SCSI_SILENT, &big); if (error != 0) { free(inbuf, M_TEMP); free(outbuf, M_TEMP); return (error); } 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 ((st->flags & ST_DONTBUFFER) == 0) 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); free(inbuf, M_TEMP); free(outbuf, M_TEMP); return (error); } /* 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 ((st->flags & ST_DONTBUFFER) == 0) 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); free(inbuf, M_TEMP); free(outbuf, M_TEMP); return (error); } /* * issue an erase command */ int st_erase(struct st_softc *st, int full, int flags) { struct scsi_erase cmd; int tmo; /* * 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. */ bzero(&cmd, sizeof(cmd)); cmd.opcode = ERASE; if (full) { cmd.byte2 = SE_IMMED|SE_LONG; tmo = ST_SPC_TIME; } else { cmd.byte2 = SE_IMMED; tmo = ST_IO_TIME; } /* * XXX We always do this asynchronously, for now. How long should * we wait if we want to (eventually) to it synchronously? */ return (scsi_scsi_cmd(st->sc_link, (struct scsi_generic *)&cmd, sizeof(cmd), 0, 0, SCSI_RETRIES, tmo, NULL, flags)); } /* * 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; int error; switch (what) { case SP_BLKS: if (st->flags & ST_PER_ACTION) { if (number > 0) { st->flags &= ~ST_PER_ACTION; return EIO; } else if (number < 0) { if (st->flags & ST_AT_FILEMARK) { /* * Handling of ST_AT_FILEMARK * in st_space will fill in the * right file mark count. */ error = st_space(st, 0, SP_FILEMARKS, flags); if (error) return error; } if (st->flags & ST_BLANK_READ) { st->flags &= ~ST_BLANK_READ; return EIO; } st->flags &= ~ST_EIO_PENDING; } } break; case SP_FILEMARKS: if (st->flags & ST_EIO_PENDING) { if (number > 0) { /* pretend we just discovered the error */ st->flags &= ~ST_EIO_PENDING; return EIO; } else if (number < 0) { /* back away from the error */ st->flags &= ~ST_EIO_PENDING; } } if (st->flags & ST_AT_FILEMARK) { st->flags &= ~ST_AT_FILEMARK; number--; } if ((st->flags & ST_BLANK_READ) && (number < 0)) { /* back away from unwritten tape */ st->flags &= ~ST_BLANK_READ; number++; /* XXX dubious */ } break; case SP_EOM: if (st->flags & ST_EIO_PENDING) { /* pretend we just discovered the error */ st->flags &= ~ST_EIO_PENDING; return EIO; } if (st->flags & ST_AT_FILEMARK) st->flags &= ~ST_AT_FILEMARK; break; } if (number == 0) return 0; bzero(&cmd, sizeof(cmd)); cmd.opcode = SPACE; cmd.byte2 = what; _lto3b(number, cmd.number); error = scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), 0, 0, 0, ST_SPC_TIME, NULL, flags); 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) { st->media_fileno += number; st->media_blkno = 0; } 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; int error; /* * It's hard to write a negative number of file marks. * Don't try. */ if (number < 0) return EINVAL; switch (number) { case 0: /* really a command to sync the drive's buffers */ break; case 1: if (st->flags & ST_FM_WRITTEN) /* already have one down */ st->flags &= ~ST_WRITTEN; else st->flags |= ST_FM_WRITTEN; st->flags &= ~ST_PER_ACTION; break; default: st->flags &= ~(ST_PER_ACTION | ST_WRITTEN); } bzero(&cmd, sizeof(cmd)); cmd.opcode = WRITE_FILEMARKS; _lto3b(number, cmd.number); error = scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), 0, 0, 0, ST_IO_TIME * 4, NULL, flags); if (error != 0) { st->media_fileno = -1; st->media_blkno = -1; } else if (st->media_fileno != -1) { st->media_fileno += number; 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 (position && !error) 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; st->media_fileno = -1; st->media_blkno = -1; if (type != LD_LOAD) { int error; int nmarks; error = st_check_eod(st, FALSE, &nmarks, flags); if (error) return error; } if (st->quirks & ST_Q_IGNORE_LOADS) { if (type == LD_LOAD) { /* * If we ignore loads, at least we should try a rewind. */ return st_rewind(st, 0, flags); } return (0); } bzero(&cmd, sizeof(cmd)); cmd.opcode = LOAD; cmd.how = type; return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), 0, 0, SCSI_RETRIES, ST_SPC_TIME, NULL, flags); } /* * Rewind the device */ int st_rewind(struct st_softc *st, u_int immediate, int flags) { struct scsi_rewind cmd; int error; int nmarks; error = st_check_eod(st, FALSE, &nmarks, flags); if (error) return error; st->flags &= ~ST_PER_ACTION; bzero(&cmd, sizeof(cmd)); cmd.opcode = REWIND; cmd.byte2 = immediate; error = scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), 0, 0, SCSI_RETRIES, immediate ? ST_CTL_TIME: ST_SPC_TIME, NULL, flags); if (error == 0) { st->media_fileno = 0; st->media_blkno = 0; } return (error); } /* * Look at the returned sense and act on the error and detirmine * The unix error number to pass back... (0 = report no error) * (-1 = continue processing) */ int st_interpret_sense(struct scsi_xfer *xs) { struct scsi_sense_data *sense = &xs->sense; struct scsi_link *sc_link = xs->sc_link; struct st_softc *st = sc_link->device_softc; struct buf *bp = xs->bp; u_int8_t serr = sense->error_code & SSD_ERRCODE; u_int8_t skey = sense->flags & SSD_KEY; int32_t info; if (((sc_link->flags & SDEV_OPEN) == 0) || (serr != SSD_ERRCODE_CURRENT && serr != SSD_ERRCODE_DEFERRED)) return (EJUSTRETURN); /* let the generic code handle it */ 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 interruptable 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 ((xs->flags & SCSI_IGNORE_NOT_READY) != 0) return (0); switch (ASC_ASCQ(sense)) { case SENSE_NOT_READY_BECOMING_READY: SC_DEBUG(sc_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 (EJUSTRETURN); } case SKEY_NO_SENSE: case SKEY_RECOVERED_ERROR: case SKEY_MEDIUM_ERROR: case SKEY_VOLUME_OVERFLOW: case SKEY_BLANK_CHECK: break; default: return (EJUSTRETURN); } /* * Get the sense fields and work out what code */ if (sense->error_code & SSD_ERRCODE_VALID) info = _4btol(sense->info); else info = xs->datalen; /* bad choice if fixed blocks */ if (st->flags & ST_FIXEDBLOCKS) { xs->resid = info * st->blksize; if (sense->flags & SSD_EOM) { st->flags |= ST_EIO_PENDING; if (bp) bp->b_resid = xs->resid; } if (sense->flags & SSD_FILEMARK) { st->flags |= ST_AT_FILEMARK; if (st->media_fileno != -1) { st->media_fileno++; st->media_blkno = 0; } if (bp) bp->b_resid = xs->resid; } if (sense->flags & SSD_ILI) { st->flags |= ST_EIO_PENDING; if (bp) bp->b_resid = xs->resid; if (sense->error_code & SSD_ERRCODE_VALID && (xs->flags & SCSI_SILENT) == 0) printf("%s: block wrong size, %d blocks residual\n", st->sc_dev.dv_xname, info); /* * This quirk code helps the drive read * the first tape block, regardless of * format. That is required for these * drives to return proper MODE SENSE * information. */ if ((st->quirks & ST_Q_SENSE_HELP) && !(sc_link->flags & SDEV_MEDIA_LOADED)) st->blksize -= 512; } /* * If no data was transferred, return immediately */ if (xs->resid >= xs->datalen) { if (st->flags & ST_EIO_PENDING) return EIO; if (st->flags & ST_AT_FILEMARK) { if (bp) bp->b_resid = xs->resid; return 0; } } } else { /* must be variable mode */ xs->resid = xs->datalen; /* to be sure */ if (sense->flags & SSD_EOM) return EIO; if (sense->flags & SSD_FILEMARK) { if (st->media_fileno != -1) { st->media_fileno++; st->media_blkno = 0; } if (bp) bp->b_resid = bp->b_bcount; return 0; } if (sense->flags & SSD_ILI) { if (info < 0) { /* * the record was bigger than the read */ if ((xs->flags & SCSI_SILENT) == 0) printf("%s: %d-byte record too big\n", st->sc_dev.dv_xname, xs->datalen - info); return (EIO); } else if (info > xs->datalen) { /* * huh? the residual is bigger than the request */ if ((xs->flags & SCSI_SILENT) == 0) printf( "%s: bad residual %d out of %d\n", st->sc_dev.dv_xname, info, xs->datalen); return (EIO); } xs->resid = info; if (bp) bp->b_resid = info; 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 ((st->quirks & ST_Q_SENSE_HELP) && !(sc_link->flags & SDEV_MEDIA_LOADED)) { /* 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 */ } return (0); } } return (EJUSTRETURN); } /* * 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; int readsize; int error; buf = malloc(1024, M_TEMP, M_NOWAIT); if (!buf) return ENOMEM; if ((error = st_mode_sense(st, 0)) != 0) goto bad; 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_mode_select(st, 0)) != 0) goto bad; st_read(st, buf, readsize, SCSI_SILENT); /* XXX */ if ((error = st_rewind(st, 0, 0)) != 0) { bad: free(buf, M_TEMP); return error; } } while (readsize != 1 && readsize > st->blksize); free(buf, M_TEMP); return 0; } int stdump(dev_t dev, daddr64_t blkno, caddr_t va, size_t size) { /* Not implemented. */ return ENXIO; } /* * Remove unprocessed buffers from queue. */ void st_kill_buffers(struct st_softc *st) { struct buf *bp; int s; while ((bp = st_buf_dequeue(st)) != NULL) { bp->b_error = ENXIO; bp->b_flags |= B_ERROR; s = splbio(); biodone(bp); splx(s); } }