fc4e325173
Change from lkm to kld Remove BROKEN_GDB kludge (it's not needed with klds) Add code for interfacing with daemon Modify manner of determining when module is idle Modify device minor number encoding, use selector functions which also permit anonymous plexes and subdisks. Remove code for 2.x support. Move vinum_scandisk to vinumio.c Remove myproc kludge Keep track of open volumes by flag, not by pid (the pids caused some problems with the lock manager). free_vinum: Remove unmapped and defective regions from plexes. Wait for daemon to stop before returning vinumopen: Don't refuse an open if the volume is already open.
502 lines
14 KiB
C
502 lines
14 KiB
C
/*-
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* Copyright (c) 1997, 1998
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* Nan Yang Computer Services Limited. All rights reserved.
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*
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* This software is distributed under the so-called ``Berkeley
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* License'':
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Nan Yang Computer
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* Services Limited.
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* 4. Neither the name of the Company nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* This software is provided ``as is'', and any express or implied
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* warranties, including, but not limited to, the implied warranties of
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* merchantability and fitness for a particular purpose are disclaimed.
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* In no event shall the company or contributors be liable for any
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* direct, indirect, incidental, special, exemplary, or consequential
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* damages (including, but not limited to, procurement of substitute
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* goods or services; loss of use, data, or profits; or business
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* interruption) however caused and on any theory of liability, whether
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* in contract, strict liability, or tort (including negligence or
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* otherwise) arising in any way out of the use of this software, even if
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* advised of the possibility of such damage.
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*
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* $Id: vinum.c,v 1.23 1999/01/15 05:03:15 grog Exp grog $
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*/
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#define STATIC /* nothing while we're testing XXX */
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#define REALLYKERNEL
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#include "opt_vinum.h"
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#include <dev/vinum/vinumhdr.h>
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#include <sys/sysproto.h> /* for sync(2) */
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#ifdef VINUMDEBUG
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#include <sys/reboot.h>
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int debug = 0;
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#endif
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#include <dev/vinum/request.h>
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STATIC struct cdevsw vinum_cdevsw =
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{
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vinumopen, vinumclose, vinumread, vinumwrite,
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vinumioctl, nostop, nullreset, nodevtotty,
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seltrue, nommap, vinumstrategy, "vinum",
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NULL, -1, vinumdump, vinumsize,
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D_DISK, 0, -1
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};
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/* Called by main() during pseudo-device attachment. */
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STATIC void vinumattach(void *);
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STATIC void vinumgetdisklabel(dev_t);
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int vinum_inactive(void);
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void free_vinum(int);
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#ifndef ACTUALLY_LKM_NOT_KERNEL
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STATIC int vinum_modevent(module_t mod, modeventtype_t type, void *unused);
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#endif
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/* Why aren't these declared anywhere? XXX */
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int setjmp(jmp_buf);
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void longjmp(jmp_buf, int);
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extern jmp_buf command_fail; /* return here if config fails */
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struct _vinum_conf vinum_conf; /* configuration information */
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STATIC int vinum_devsw_installed = 0;
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/*
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* Called by main() during pseudo-device attachment. All we need
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* to do is allocate enough space for devices to be configured later, and
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* add devsw entries.
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*/
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void
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vinumattach(void *dummy)
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{
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char *buf; /* pointer to temporary buffer */
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struct _ioctl_reply *ioctl_reply; /* struct to return */
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struct uio uio;
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struct iovec iovec;
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/* modload should prevent multiple loads, so this is worth a panic */
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if ((vinum_conf.flags & VF_LOADED) != NULL)
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panic("vinum: already loaded");
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printf("vinum: loaded\n");
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vinum_conf.flags |= VF_LOADED; /* we're loaded now */
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daemonq = NULL; /* initialize daemon's work queue */
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dqend = NULL;
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cdevsw_add_generic(BDEV_MAJOR, CDEV_MAJOR, &vinum_cdevsw);
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#ifdef DEVFS
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#error DEVFS not finished yet
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#endif
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uio.uio_iov = &iovec;
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uio.uio_iovcnt = 1; /* just one buffer */
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uio.uio_offset = 0; /* start at the beginning */
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uio.uio_resid = 512; /* one sector */
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uio.uio_segflg = UIO_SYSSPACE; /* we're in system space */
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uio.uio_rw = UIO_READ; /* do we need this? */
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uio.uio_procp = curproc; /* do it for our own process */
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iovec.iov_len = 512;
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buf = (char *) Malloc(iovec.iov_len); /* get a buffer */
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CHECKALLOC(buf, "vinum: no memory\n"); /* can't get 512 bytes? */
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iovec.iov_base = buf; /* read into buf */
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/* allocate space: drives... */
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DRIVE = (struct drive *) Malloc(sizeof(struct drive) * INITIAL_DRIVES);
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CHECKALLOC(DRIVE, "vinum: no memory\n");
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vinum_conf.drives_allocated = INITIAL_DRIVES; /* number of drive slots allocated */
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vinum_conf.drives_used = 0; /* and number in use */
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/* volumes, ... */
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VOL = (struct volume *) Malloc(sizeof(struct volume) * INITIAL_VOLUMES);
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CHECKALLOC(VOL, "vinum: no memory\n");
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vinum_conf.volumes_allocated = INITIAL_VOLUMES; /* number of volume slots allocated */
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vinum_conf.volumes_used = 0; /* and number in use */
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/* plexes, ... */
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PLEX = (struct plex *) Malloc(sizeof(struct plex) * INITIAL_PLEXES);
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CHECKALLOC(PLEX, "vinum: no memory\n");
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vinum_conf.plexes_allocated = INITIAL_PLEXES; /* number of plex slots allocated */
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vinum_conf.plexes_used = 0; /* and number in use */
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/* and subdisks */
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SD = (struct sd *) Malloc(sizeof(struct sd) * INITIAL_SUBDISKS);
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CHECKALLOC(SD, "vinum: no memory\n");
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vinum_conf.subdisks_allocated = INITIAL_SUBDISKS; /* number of sd slots allocated */
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vinum_conf.subdisks_used = 0; /* and number in use */
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ioctl_reply = NULL; /* no reply on longjmp */
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}
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/* Check if we have anything open. If so, return 0 (not inactive),
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* otherwise 1 (inactive) */
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int
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vinum_inactive(void)
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{
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int i;
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int can_do = 1; /* assume we can do it */
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lock_config();
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for (i = 0; i < vinum_conf.volumes_used; i++) {
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if (VOL[i].opencount != 0) { /* volume is open */
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can_do = 0;
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break;
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}
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}
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unlock_config();
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return can_do;
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}
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/* Free all structures.
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* If cleardrive is 0, save the configuration; otherwise
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* remove the configuration from the drive.
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*
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* Before coming here, ensure that no volumes are open.
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*/
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void
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free_vinum(int cleardrive)
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{
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int i;
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if (cleardrive) {
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for (i = 0; i < vinum_conf.drives_used; i++)
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remove_drive(i); /* remove the drive */
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} else { /* keep the config */
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save_config();
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if (DRIVE != NULL) {
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for (i = 0; i < vinum_conf.drives_used; i++)
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free_drive(&DRIVE[i]); /* close files and things */
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Free(DRIVE);
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}
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}
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queue_daemon_request(daemonrq_return, NULL); /* tell daemon to stop */
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if (SD != NULL)
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Free(SD);
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if (PLEX != NULL) {
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for (i = 0; i < vinum_conf.plexes_used; i++) {
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struct plex *plex = &vinum_conf.plex[i];
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if (plex->state != plex_unallocated) { /* we have real data there */
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if (plex->sdnos)
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Free(plex->sdnos);
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}
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}
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Free(PLEX);
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}
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if (VOL != NULL)
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Free(VOL);
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bzero(&vinum_conf, sizeof(vinum_conf));
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while ((daemon_options & daemon_stopped) == 0) /* daemon hasn't stopped yet, */
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tsleep(&vinum_daemon, PRIBIO, "vdaemn", 10 * hz); /* wait for it to stop */
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tsleep(&vinum_daemon, PRIBIO, "diedie", 3 * hz); /* and wait another 3 secs XXX */
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}
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#ifdef ACTUALLY_LKM_NOT_KERNEL /* stuff for LKMs */
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MOD_MISC(vinum);
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/*
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* Function called when loading the driver.
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*/
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STATIC int
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vinum_load(struct lkm_table *lkmtp, int cmd)
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{
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vinumattach(NULL);
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return 0; /* OK */
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}
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/*
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* Function called when unloading the driver.
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*/
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STATIC int
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vinum_unload(struct lkm_table *lkmtp, int cmd)
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{
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if (vinum_inactive()) { /* is anything open? */
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struct sync_args dummyarg =
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{0};
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printf("vinum: unloaded\n");
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sync(curproc, &dummyarg); /* write out buffers */
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free_vinum(0); /* no: clean up */
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cdevsw[CDEV_MAJOR] = NULL; /* and cdevsw */
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return 0;
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} else
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return EBUSY;
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}
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/*
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* Dispatcher function for the module (load/unload/stat).
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*/
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int
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vinum_mod(struct lkm_table *lkmtp, int cmd, int ver)
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{
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MOD_DISPATCH(vinum, /* module name */
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lkmtp, /* LKM table */
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cmd, /* command */
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ver,
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vinum_load, /* load with this function */
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vinum_unload, /* and unload with this */
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lkm_nullcmd);
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}
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#else /* not LKM */
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STATIC int
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vinum_modevent(module_t mod, modeventtype_t type, void *unused)
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{
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struct sync_args dummyarg =
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{0};
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switch (type) {
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case MOD_LOAD:
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vinumattach(NULL);
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return 0; /* OK */
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case MOD_UNLOAD:
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if (!vinum_inactive()) /* is anything open? */
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return EBUSY;
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sync(curproc, &dummyarg); /* write out buffers */
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free_vinum(0); /* no: clean up */
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cdevsw[CDEV_MAJOR] = NULL; /* and cdevsw */
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return 0;
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default:
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break;
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}
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return 0;
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}
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moduledata_t vinum_mod =
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{
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"vinum",
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vinum_modevent,
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0
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};
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DECLARE_MODULE(vinum, vinum_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
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#endif /* LKM */
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/* ARGSUSED */
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/* Open a vinum object
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* At the moment, we only open volumes and the
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* super device. It's a nice concept to be
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* able to open drives, subdisks and plexes, but
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* I can't think what good it could be */
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int
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vinumopen(dev_t dev,
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int flags,
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int fmt,
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struct proc *p)
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{
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int s; /* spl */
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int error;
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unsigned int index;
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struct volume *vol;
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struct plex *plex;
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struct sd *sd;
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struct devcode *device;
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device = (struct devcode *) &dev;
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error = 0;
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/* First, decide what we're looking at */
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switch (device->type) {
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case VINUM_VOLUME_TYPE:
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index = Volno(dev);
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if (index >= vinum_conf.volumes_used)
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return ENXIO; /* no such device */
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vol = &VOL[index];
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switch (vol->state) {
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case volume_unallocated:
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case volume_uninit:
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return ENXIO;
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case volume_up:
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vol->opencount = 1;
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vol->pid = p->p_pid; /* and say who we are (do we need this? XXX) */
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return 0;
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case volume_down:
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return EIO;
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default:
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return EINVAL;
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}
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case VINUM_PLEX_TYPE:
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if (Volno(dev) >= vinum_conf.volumes_used)
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return ENXIO;
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index = Plexno(dev); /* get plex index in vinum_conf */
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if (index >= vinum_conf.plexes_used)
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return ENXIO; /* no such device */
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plex = &PLEX[index];
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switch (plex->state) {
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case plex_unallocated:
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return EINVAL;
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default:
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s = splhigh();
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if (plex->pid /* it's open already */
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&& (plex->pid != p->p_pid)) { /* and not by us, */
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splx(s);
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return EBUSY; /* one at a time, please */
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}
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plex->pid = p->p_pid; /* and say who we are (do we need this? XXX) */
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splx(s);
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return 0;
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}
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case VINUM_SD_TYPE:
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if ((Volno(dev) >= vinum_conf.volumes_used) || /* no such volume */
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(Plexno(dev) >= vinum_conf.plexes_used)) /* or no such plex */
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return ENXIO; /* no such device */
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index = Sdno(dev); /* get the subdisk number */
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if (index >= vinum_conf.subdisks_used)
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return ENXIO; /* no such device */
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sd = &SD[index];
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/* Opening a subdisk is always a special operation, so we
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* ignore the state as long as it represents a real subdisk */
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switch (sd->state) {
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case sd_unallocated:
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case sd_uninit:
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return EINVAL;
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default:
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s = splhigh();
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if (sd->pid /* it's open already */
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&& (sd->pid != p->p_pid)) { /* and not by us, */
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splx(s);
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return EBUSY; /* one at a time, please */
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}
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sd->pid = p->p_pid; /* and say who we are (do we need this? XXX) */
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splx(s);
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return 0;
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}
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case VINUM_DRIVE_TYPE:
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default:
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return ENODEV; /* don't know what to do with these */
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case VINUM_SUPERDEV_TYPE:
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if (p->p_ucred->cr_uid == 0) { /* root calling, */
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vinum_conf.opencount = 1; /* we're open */
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return 0; /* no worries opening super dev */
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} else
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return EPERM; /* you can't do that! */
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}
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}
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/* ARGSUSED */
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int
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vinumclose(dev_t dev,
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int flags,
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int fmt,
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struct proc *p)
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{
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unsigned int index;
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struct volume *vol;
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struct plex *plex;
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struct sd *sd;
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struct devcode *device = (struct devcode *) &dev;
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index = Volno(dev);
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/* First, decide what we're looking at */
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switch (device->type) {
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case VINUM_VOLUME_TYPE:
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if (index >= vinum_conf.volumes_used)
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return ENXIO; /* no such device */
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vol = &VOL[index];
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switch (vol->state) {
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case volume_unallocated:
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case volume_uninit:
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return ENXIO;
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case volume_up:
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vol->opencount = 0; /* reset our flags */
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vol->pid = NULL; /* and forget who owned us */
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return 0;
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case volume_down:
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return EIO;
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default:
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return EINVAL;
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}
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case VINUM_PLEX_TYPE:
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if (Volno(dev) >= vinum_conf.volumes_used)
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return ENXIO;
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index = Plexno(dev); /* get plex index in vinum_conf */
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if (index >= vinum_conf.plexes_used)
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return ENXIO; /* no such device */
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plex = &PLEX[index];
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plex->pid = 0;
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return 0;
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case VINUM_SD_TYPE:
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if ((Volno(dev) >= vinum_conf.volumes_used) || /* no such volume */
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(Plexno(dev) >= vinum_conf.plexes_used)) /* or no such plex */
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return ENXIO; /* no such device */
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index = Sdno(dev); /* get the subdisk number */
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if (index >= vinum_conf.subdisks_used)
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return ENXIO; /* no such device */
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sd = &SD[index];
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sd->pid = 0;
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return 0;
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case VINUM_SUPERDEV_TYPE:
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if (p->p_ucred->cr_uid == 0) /* root calling, */
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vinum_conf.opencount = 0; /* no longer open */
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return 0; /* no worries closing super dev */
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case VINUM_DRIVE_TYPE:
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default:
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return ENODEV; /* don't know what to do with these */
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}
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}
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/* size routine */
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int
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vinumsize(dev_t dev)
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{
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struct volume *vol;
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int size;
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vol = &VOL[Volno(dev)];
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if (vol->state == volume_up)
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size = vol->size;
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else
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return 0; /* err on the size of conservatism */
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return size;
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}
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int
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vinumdump(dev_t dev)
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{
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/* Not implemented. */
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return ENXIO;
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}
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