/* $NetBSD: device-mapper.c,v 1.40.4.1 2020/01/21 18:22:51 martin Exp $ */ /* * Copyright (c) 2010 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Adam Hamsik. * * 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. */ /* * I want to say thank you to all people who helped me with this project. */ #include #include #include #include #include #include #include #include #include #include #include #include #include "netbsd-dm.h" #include "dm.h" #include "ioconf.h" static dev_type_open(dmopen); static dev_type_close(dmclose); static dev_type_read(dmread); static dev_type_write(dmwrite); static dev_type_ioctl(dmioctl); static dev_type_strategy(dmstrategy); static dev_type_size(dmsize); /* attach and detach routines */ #ifdef _MODULE static int dmdestroy(void); #endif static void dm_doinit(void); static int dm_cmd_to_fun(prop_dictionary_t); static int disk_ioctl_switch(dev_t, u_long, void *); static int dm_ioctl_switch(u_long); static void dmminphys(struct buf *); /* CF attach/detach functions used for power management */ static int dm_detach(device_t, int); static void dm_attach(device_t, device_t, void *); static int dm_match(device_t, cfdata_t, void *); /* ***Variable-definitions*** */ const struct bdevsw dm_bdevsw = { .d_open = dmopen, .d_close = dmclose, .d_strategy = dmstrategy, .d_ioctl = dmioctl, .d_dump = nodump, .d_psize = dmsize, .d_discard = nodiscard, .d_flag = D_DISK | D_MPSAFE }; const struct cdevsw dm_cdevsw = { .d_open = dmopen, .d_close = dmclose, .d_read = dmread, .d_write = dmwrite, .d_ioctl = dmioctl, .d_stop = nostop, .d_tty = notty, .d_poll = nopoll, .d_mmap = nommap, .d_kqfilter = nokqfilter, .d_discard = nodiscard, .d_flag = D_DISK | D_MPSAFE }; const struct dkdriver dmdkdriver = { .d_strategy = dmstrategy }; CFATTACH_DECL3_NEW(dm, 0, dm_match, dm_attach, dm_detach, NULL, NULL, NULL, DVF_DETACH_SHUTDOWN); extern uint32_t dm_dev_counter; /* * This array is used to translate cmd to function pointer. * * Interface between libdevmapper and lvm2tools uses different * names for one IOCTL call because libdevmapper do another thing * then. When I run "info" or "mknodes" libdevmapper will send same * ioctl to kernel but will do another things in userspace. * */ static const struct cmd_function cmd_fn[] = { { .cmd = "version", .fn = dm_get_version_ioctl, .allowed = 1 }, { .cmd = "targets", .fn = dm_list_versions_ioctl, .allowed = 1 }, { .cmd = "create", .fn = dm_dev_create_ioctl, .allowed = 0 }, { .cmd = "info", .fn = dm_dev_status_ioctl, .allowed = 1 }, { .cmd = "mknodes", .fn = dm_dev_status_ioctl, .allowed = 1 }, { .cmd = "names", .fn = dm_dev_list_ioctl, .allowed = 1 }, { .cmd = "suspend", .fn = dm_dev_suspend_ioctl, .allowed = 0 }, { .cmd = "remove", .fn = dm_dev_remove_ioctl, .allowed = 0 }, { .cmd = "rename", .fn = dm_dev_rename_ioctl, .allowed = 0 }, { .cmd = "resume", .fn = dm_dev_resume_ioctl, .allowed = 0 }, { .cmd = "clear", .fn = dm_table_clear_ioctl, .allowed = 0 }, { .cmd = "deps", .fn = dm_table_deps_ioctl, .allowed = 1 }, { .cmd = "reload", .fn = dm_table_load_ioctl, .allowed = 0 }, { .cmd = "status", .fn = dm_table_status_ioctl, .allowed = 1 }, { .cmd = "table", .fn = dm_table_status_ioctl, .allowed = 1 }, { .cmd = NULL, .fn = NULL, .allowed = 0 } }; #ifdef _MODULE #include /* Autoconf defines */ CFDRIVER_DECL(dm, DV_DISK, NULL); MODULE(MODULE_CLASS_DRIVER, dm, "dk_subr"); /* New module handle routine */ static int dm_modcmd(modcmd_t cmd, void *arg) { #ifdef _MODULE int error; devmajor_t bmajor, cmajor; error = 0; bmajor = -1; cmajor = -1; switch (cmd) { case MODULE_CMD_INIT: error = config_cfdriver_attach(&dm_cd); if (error) break; error = config_cfattach_attach(dm_cd.cd_name, &dm_ca); if (error) { aprint_error("%s: unable to register cfattach\n", dm_cd.cd_name); return error; } error = devsw_attach(dm_cd.cd_name, &dm_bdevsw, &bmajor, &dm_cdevsw, &cmajor); if (error == EEXIST) error = 0; if (error) { config_cfattach_detach(dm_cd.cd_name, &dm_ca); config_cfdriver_detach(&dm_cd); break; } dm_doinit(); break; case MODULE_CMD_FINI: /* * Disable unloading of dm module if there are any devices * defined in driver. This is probably too strong we need * to disable auto-unload only if there is mounted dm device * present. */ if (dm_dev_counter > 0) return EBUSY; error = dmdestroy(); if (error) break; config_cfdriver_detach(&dm_cd); devsw_detach(&dm_bdevsw, &dm_cdevsw); break; case MODULE_CMD_STAT: return ENOTTY; default: return ENOTTY; } return error; #else return ENOTTY; #endif } #endif /* _MODULE */ /* * dm_match: * * Autoconfiguration match function for pseudo-device glue. */ static int dm_match(device_t parent, cfdata_t match, void *aux) { /* Pseudo-device; always present. */ return (1); } /* * dm_attach: * * Autoconfiguration attach function for pseudo-device glue. */ static void dm_attach(device_t parent, device_t self, void *aux) { if (!pmf_device_register(self, NULL, NULL)) aprint_error_dev(self, "couldn't establish power handler\n"); } /* * dm_detach: * * Autoconfiguration detach function for pseudo-device glue. * This routine is called by dm_ioctl::dm_dev_remove_ioctl and by autoconf to * remove devices created in device-mapper. */ static int dm_detach(device_t self, int flags) { dm_dev_t *dmv; pmf_device_deregister(self); /* Detach device from global device list */ if ((dmv = dm_dev_detach(self)) == NULL) return ENOENT; /* Destroy active table first. */ dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE); /* Destroy inactive table if exits, too. */ dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); dm_table_head_destroy(&dmv->table_head); /* Destroy disk device structure */ disk_detach(dmv->diskp); disk_destroy(dmv->diskp); /* Destroy device */ (void)dm_dev_free(dmv); /* Decrement device counter After removing device */ atomic_dec_32(&dm_dev_counter); return 0; } static void dm_doinit(void) { dm_target_init(); dm_dev_init(); dm_pdev_init(); } /* attach routine */ void dmattach(int n) { int error; error = config_cfattach_attach(dm_cd.cd_name, &dm_ca); if (error) { aprint_error("%s: unable to register cfattach\n", dm_cd.cd_name); } else { dm_doinit(); } } #ifdef _MODULE /* Destroy routine */ static int dmdestroy(void) { int error; error = config_cfattach_detach(dm_cd.cd_name, &dm_ca); if (error) return error; dm_dev_destroy(); dm_pdev_destroy(); dm_target_destroy(); return 0; } #endif /* _MODULE */ static int dmopen(dev_t dev, int flags, int mode, struct lwp *l) { aprint_debug("dm open routine called %" PRIu32 "\n", minor(dev)); return 0; } static int dmclose(dev_t dev, int flags, int mode, struct lwp *l) { aprint_debug("dm close routine called %" PRIu32 "\n", minor(dev)); return 0; } static int dmioctl(dev_t dev, const u_long cmd, void *data, int flag, struct lwp *l) { int r; prop_dictionary_t dm_dict_in; r = 0; aprint_debug("dmioctl called\n"); KASSERT(data != NULL); if (( r = disk_ioctl_switch(dev, cmd, data)) == ENOTTY) { struct plistref *pref = (struct plistref *) data; /* Check if we were called with NETBSD_DM_IOCTL ioctl otherwise quit. */ if ((r = dm_ioctl_switch(cmd)) != 0) return r; if((r = prop_dictionary_copyin_ioctl(pref, cmd, &dm_dict_in)) != 0) return r; if ((r = dm_check_version(dm_dict_in)) != 0) goto cleanup_exit; /* run ioctl routine */ if ((r = dm_cmd_to_fun(dm_dict_in)) != 0) goto cleanup_exit; cleanup_exit: r = prop_dictionary_copyout_ioctl(pref, cmd, dm_dict_in); prop_object_release(dm_dict_in); } return r; } /* * Translate command sent from libdevmapper to func. */ static int dm_cmd_to_fun(prop_dictionary_t dm_dict) { int i, r; prop_string_t command; r = 0; if ((command = prop_dictionary_get(dm_dict, DM_IOCTL_COMMAND)) == NULL) return EINVAL; for(i = 0; cmd_fn[i].cmd != NULL; i++) if (prop_string_equals_cstring(command, cmd_fn[i].cmd)) break; if (!cmd_fn[i].allowed && (r = kauth_authorize_system(kauth_cred_get(), KAUTH_SYSTEM_DEVMAPPER, 0, NULL, NULL, NULL)) != 0) return r; if (cmd_fn[i].cmd == NULL) return EINVAL; aprint_debug("ioctl %s called\n", cmd_fn[i].cmd); r = cmd_fn[i].fn(dm_dict); return r; } /* Call apropriate ioctl handler function. */ static int dm_ioctl_switch(u_long cmd) { switch(cmd) { case NETBSD_DM_IOCTL: aprint_debug("dm NetBSD_DM_IOCTL called\n"); break; default: aprint_debug("dm unknown ioctl called\n"); return ENOTTY; break; /* NOT REACHED */ } return 0; } /* * Check for disk specific ioctls. */ static int disk_ioctl_switch(dev_t dev, u_long cmd, void *data) { dm_dev_t *dmv; /* disk ioctls make sense only on block devices */ if (minor(dev) == 0) return ENOTTY; switch(cmd) { case DIOCGWEDGEINFO: { struct dkwedge_info *dkw = (void *) data; unsigned secsize; if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) return ENODEV; aprint_debug("DIOCGWEDGEINFO ioctl called\n"); strlcpy(dkw->dkw_devname, dmv->name, 16); strlcpy(dkw->dkw_wname, dmv->name, DM_NAME_LEN); strlcpy(dkw->dkw_parent, dmv->name, 16); dkw->dkw_offset = 0; dm_table_disksize(&dmv->table_head, &dkw->dkw_size, &secsize); strcpy(dkw->dkw_ptype, DKW_PTYPE_FFS); dm_dev_unbusy(dmv); break; } case DIOCGDISKINFO: { struct plistref *pref = (struct plistref *) data; if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) return ENODEV; if (dmv->diskp->dk_info == NULL) { dm_dev_unbusy(dmv); return ENOTSUP; } else prop_dictionary_copyout_ioctl(pref, cmd, dmv->diskp->dk_info); dm_dev_unbusy(dmv); break; } case DIOCCACHESYNC: { dm_table_entry_t *table_en; dm_table_t *tbl; if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) return ENODEV; /* Select active table */ tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE); /* * Call sync target routine for all table entries. Target sync * routine basically call DIOCCACHESYNC on underlying devices. */ SLIST_FOREACH(table_en, tbl, next) { (void)table_en->target->sync(table_en); } dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE); dm_dev_unbusy(dmv); break; } case DIOCGSECTORSIZE: { u_int *valp = data; uint64_t numsec; unsigned int secsize; if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) return ENODEV; aprint_debug("DIOCGSECTORSIZE ioctl called\n"); dm_table_disksize(&dmv->table_head, &numsec, &secsize); *valp = secsize; dm_dev_unbusy(dmv); break; } case DIOCGMEDIASIZE: { off_t *valp = data; uint64_t numsec; unsigned int secsize; if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) return ENODEV; aprint_debug("DIOCGMEDIASIZE ioctl called\n"); dm_table_disksize(&dmv->table_head, &numsec, &secsize); *valp = numsec; dm_dev_unbusy(dmv); break; } default: aprint_debug("unknown disk_ioctl called\n"); return ENOTTY; break; /* NOT REACHED */ } return 0; } /* * Do all IO operations on dm logical devices. */ static void dmstrategy(struct buf *bp) { dm_dev_t *dmv; dm_table_t *tbl; dm_table_entry_t *table_en; struct buf *nestbuf; uint64_t buf_start, buf_len, issued_len; uint64_t table_start, table_end; uint64_t start, end; buf_start = bp->b_blkno * DEV_BSIZE; buf_len = bp->b_bcount; tbl = NULL; table_end = 0; issued_len = 0; if ((dmv = dm_dev_lookup(NULL, NULL, minor(bp->b_dev))) == NULL) { bp->b_error = EIO; bp->b_resid = bp->b_bcount; biodone(bp); return; } if (bounds_check_with_mediasize(bp, DEV_BSIZE, dm_table_size(&dmv->table_head)) <= 0) { dm_dev_unbusy(dmv); bp->b_resid = bp->b_bcount; biodone(bp); return; } /* * disk(9) is part of device structure and it can't be used without * mutual exclusion, use diskp_mtx until it will be fixed. */ mutex_enter(&dmv->diskp_mtx); disk_busy(dmv->diskp); mutex_exit(&dmv->diskp_mtx); /* Select active table */ tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE); /* Nested buffers count down to zero therefore I have to set bp->b_resid to maximal value. */ bp->b_resid = bp->b_bcount; /* * Find out what tables I want to select. */ SLIST_FOREACH(table_en, tbl, next) { /* I need need number of bytes not blocks. */ table_start = table_en->start * DEV_BSIZE; /* * I have to sub 1 from table_en->length to prevent * off by one error */ table_end = table_start + (table_en->length)* DEV_BSIZE; start = MAX(table_start, buf_start); end = MIN(table_end, buf_start + buf_len); aprint_debug("----------------------------------------\n"); aprint_debug("table_start %010" PRIu64", table_end %010" PRIu64 "\n", table_start, table_end); aprint_debug("buf_start %010" PRIu64", buf_len %010" PRIu64"\n", buf_start, buf_len); aprint_debug("start-buf_start %010"PRIu64", end %010" PRIu64"\n", start - buf_start, end); aprint_debug("start %010" PRIu64" , end %010" PRIu64"\n", start, end); aprint_debug("\n----------------------------------------\n"); if (start < end) { /* create nested buffer */ nestbuf = getiobuf(NULL, true); nestiobuf_setup(bp, nestbuf, start - buf_start, (end - start)); issued_len += end - start; /* I need number of blocks. */ nestbuf->b_blkno = (start - table_start) / DEV_BSIZE; table_en->target->strategy(table_en, nestbuf); } } if (issued_len < buf_len) nestiobuf_done(bp, buf_len - issued_len, EINVAL); mutex_enter(&dmv->diskp_mtx); disk_unbusy(dmv->diskp, buf_len, bp != NULL ? bp->b_flags & B_READ : 0); mutex_exit(&dmv->diskp_mtx); dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE); dm_dev_unbusy(dmv); return; } static int dmread(dev_t dev, struct uio *uio, int flag) { return (physio(dmstrategy, NULL, dev, B_READ, dmminphys, uio)); } static int dmwrite(dev_t dev, struct uio *uio, int flag) { return (physio(dmstrategy, NULL, dev, B_WRITE, dmminphys, uio)); } static int dmsize(dev_t dev) { dm_dev_t *dmv; uint64_t size; size = 0; if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) return -ENOENT; size = dm_table_size(&dmv->table_head); dm_dev_unbusy(dmv); return size; } static void dmminphys(struct buf *bp) { bp->b_bcount = MIN(bp->b_bcount, MAXPHYS); } void dmgetproperties(struct disk *disk, dm_table_head_t *head) { uint64_t numsec; unsigned secsize; dm_table_disksize(head, &numsec, &secsize); struct disk_geom *dg = &disk->dk_geom; memset(dg, 0, sizeof(*dg)); dg->dg_secperunit = numsec; dg->dg_secsize = secsize; dg->dg_nsectors = 32; dg->dg_ntracks = 64; disk_set_info(NULL, disk, "ESDI"); }