/* $NetBSD: device-mapper.c,v 1.22 2010/03/26 15:46:04 jakllsch Exp $ */ /* * Copyright (c) 2010-2011 Alex Hornung * 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" static d_ioctl_t dmioctl; static d_open_t dmopen; static d_close_t dmclose; static d_psize_t dmsize; static d_strategy_t dmstrategy; static d_dump_t dmdump; /* New module handle and destroy routines */ static int dm_modcmd(module_t mod, int cmd, void *unused); static int dmdestroy(void); static void dm_doinit(void); static int dm_cmd_to_fun(prop_dictionary_t); static int disk_ioctl_switch(cdev_t, u_long, void *); static int dm_ioctl_switch(u_long); #if 0 static void dmminphys(struct buf *); #endif /* ***Variable-definitions*** */ struct dev_ops dm_ops = { { "dm", 0, D_DISK | D_MPSAFE }, .d_open = dmopen, .d_close = dmclose, .d_read = physread, .d_write = physwrite, .d_ioctl = dmioctl, .d_strategy = dmstrategy, .d_psize = dmsize, .d_dump = dmdump, /* D_DISK */ }; MALLOC_DEFINE(M_DM, "dm", "Device Mapper allocations"); int dm_debug_level = 0; extern uint64_t dm_dev_counter; static cdev_t dmcdev; static moduledata_t dm_mod = { "dm", dm_modcmd, NULL }; DECLARE_MODULE(dm, dm_mod, SI_SUB_RAID, SI_ORDER_ANY); MODULE_VERSION(dm, 1); /* * 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 struct cmd_function cmd_fn[] = { { .cmd = "version", .fn = NULL}, { .cmd = "targets", .fn = dm_list_versions_ioctl}, { .cmd = "create", .fn = dm_dev_create_ioctl}, { .cmd = "info", .fn = dm_dev_status_ioctl}, { .cmd = "mknodes", .fn = dm_dev_status_ioctl}, { .cmd = "names", .fn = dm_dev_list_ioctl}, { .cmd = "suspend", .fn = dm_dev_suspend_ioctl}, { .cmd = "remove", .fn = dm_dev_remove_ioctl}, { .cmd = "remove_all", .fn = dm_dev_remove_all_ioctl}, { .cmd = "rename", .fn = dm_dev_rename_ioctl}, { .cmd = "resume", .fn = dm_dev_resume_ioctl}, { .cmd = "clear", .fn = dm_table_clear_ioctl}, { .cmd = "deps", .fn = dm_table_deps_ioctl}, { .cmd = "reload", .fn = dm_table_load_ioctl}, { .cmd = "status", .fn = dm_table_status_ioctl}, { .cmd = "table", .fn = dm_table_status_ioctl}, { .cmd = "message", .fn = dm_message_ioctl}, }; /* New module handle routine */ static int dm_modcmd(module_t mod, int cmd, void *unused) { int error; error = 0; switch (cmd) { case MOD_LOAD: dm_doinit(); kprintf("Device Mapper version %d.%d.%d loaded\n", DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL); break; case MOD_UNLOAD: /* * 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; kprintf("Device Mapper unloaded\n"); break; default: break; } return error; } static void dm_doinit(void) { dm_target_init(); dm_dev_init(); dm_pdev_init(); dmcdev = make_dev(&dm_ops, 0, UID_ROOT, GID_OPERATOR, 0640, "mapper/control"); } /* Destroy routine */ static int dmdestroy(void) { destroy_dev(dmcdev); dm_dev_uninit(); dm_pdev_uninit(); dm_target_uninit(); return 0; } static int dmopen(struct dev_open_args *ap) { cdev_t dev = ap->a_head.a_dev; dm_dev_t *dmv; /* Shortcut for the control device */ if (minor(dev) == 0) return 0; if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) return ENXIO; dmv->is_open = 1; dm_dev_unbusy(dmv); aprint_debug("dm open routine called %" PRIu32 "\n", minor(ap->a_head.a_dev)); return 0; } static int dmclose(struct dev_close_args *ap) { cdev_t dev = ap->a_head.a_dev; dm_dev_t *dmv; /* Shortcut for the control device */ if (minor(dev) == 0) return 0; if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) return ENXIO; dmv->is_open = 0; dm_dev_unbusy(dmv); aprint_debug("dm close routine called %" PRIu32 "\n", minor(ap->a_head.a_dev)); return 0; } static int dmioctl(struct dev_ioctl_args *ap) { cdev_t dev = ap->a_head.a_dev; u_long cmd = ap->a_cmd; void *data = ap->a_data; struct plistref *pref = (struct plistref *)data; int r, err; prop_dictionary_t dm_dict_in; err = r = 0; aprint_debug("dmioctl called\n"); KKASSERT(data != NULL); if ((r = disk_ioctl_switch(dev, cmd, data)) != ENOTTY) return r; /* Handled disk ioctl */ if ((r = dm_ioctl_switch(cmd)) != 0) return r; /* Not NETBSD_DM_IOCTL */ if ((r = prop_dictionary_copyin_ioctl(pref, cmd, &dm_dict_in)) != 0) return r; if ((r = dm_check_version(dm_dict_in)) == 0) err = dm_cmd_to_fun(dm_dict_in); r = prop_dictionary_copyout_ioctl(pref, cmd, dm_dict_in); prop_object_release(dm_dict_in); /* Return the dm ioctl error if any. */ if (err) return err; return r; } /* * Translate command sent from libdevmapper to func. */ static int dm_cmd_to_fun(prop_dictionary_t dm_dict) { int i, size; prop_string_t command; struct cmd_function *p = NULL; size = sizeof(cmd_fn) / sizeof(cmd_fn[0]); if ((command = prop_dictionary_get(dm_dict, DM_IOCTL_COMMAND)) == NULL) return EINVAL; for (i = 0; i < size; i++) { p = &cmd_fn[i]; if (prop_string_equals_cstring(command, p->cmd)) break; } KKASSERT(p); if (i == size) { aprint_debug("Unknown ioctl\n"); return EINVAL; } aprint_debug("ioctl %s called %p\n", p->cmd, p->fn); if (p->fn == NULL) return 0; /* No handler required */ return p->fn(dm_dict); } /* 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(cdev_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 DIOCGPART: if ((dmv = dev->si_drv1) == NULL) return ENODEV; if (dmv->diskp->d_info.d_media_blksize == 0) { return ENOTSUP; } else { u_int64_t size; struct partinfo *dpart = data; bzero(dpart, sizeof(*dpart)); size = dm_table_size(&dmv->table_head); dpart->media_offset = 0; dpart->media_size = size * DEV_BSIZE; dpart->media_blocks = size; dpart->media_blksize = DEV_BSIZE; dpart->fstype = FS_BSDFFS; } 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 int dmstrategy(struct dev_strategy_args *ap) { cdev_t dev = ap->a_head.a_dev; struct bio *bio = ap->a_bio; struct buf *bp = bio->bio_buf; int bypass; 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 = bio->bio_offset; buf_len = bp->b_bcount; tbl = NULL; table_end = 0; issued_len = 0; dmv = dev->si_drv1; switch(bp->b_cmd) { case BUF_CMD_READ: case BUF_CMD_WRITE: case BUF_CMD_FREEBLKS: bypass = 0; break; case BUF_CMD_FLUSH: bypass = 1; KKASSERT(buf_len == 0); break; default: bp->b_error = EIO; bp->b_resid = bp->b_bcount; biodone(bio); return 0; } if (bypass == 0 && bounds_check_with_mediasize(bio, DEV_BSIZE, dm_table_size(&dmv->table_head)) <= 0) { bp->b_resid = bp->b_bcount; biodone(bio); return 0; } /* Select active table */ tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE); nestiobuf_init(bio); devstat_start_transaction(&dmv->stats); /* * 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; table_end = table_start + (table_en->length) * DEV_BSIZE; /* * Calculate the start and end */ start = MAX(table_start, buf_start); end = MIN(table_end, buf_start + buf_len); if (dm_debug_level) { aprint_normal("----------------------------------------\n"); aprint_normal("table_start %010" PRIu64", table_end %010" PRIu64 "\n", table_start, table_end); aprint_normal("buf_start %010" PRIu64", buf_len %010" PRIu64"\n", buf_start, buf_len); aprint_normal("start-buf_start %010"PRIu64", end %010" PRIu64"\n", start - buf_start, end); aprint_normal("start %010" PRIu64", end %010" PRIu64"\n", start, end); aprint_normal("----------------------------------------\n"); } if (bypass) { nestbuf = getpbuf(NULL); nestbuf->b_flags |= bio->bio_buf->b_flags & B_HASBOGUS; nestiobuf_add(bio, nestbuf, 0, 0, &dmv->stats); nestbuf->b_bio1.bio_offset = 0; table_en->target->strategy(table_en, nestbuf); } else if (start < end) { nestbuf = getpbuf(NULL); nestbuf->b_flags |= bio->bio_buf->b_flags & B_HASBOGUS; nestiobuf_add(bio, nestbuf, start - buf_start, (end - start), &dmv->stats); issued_len += end - start; nestbuf->b_bio1.bio_offset = (start - table_start); table_en->target->strategy(table_en, nestbuf); } } if (issued_len < buf_len) nestiobuf_error(bio, EINVAL); nestiobuf_start(bio); dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE); return 0; } static int dmdump(struct dev_dump_args *ap) { cdev_t dev = ap->a_head.a_dev; dm_dev_t *dmv; dm_table_t *tbl; dm_table_entry_t *table_en; uint64_t buf_start, buf_len, issued_len; uint64_t table_start, table_end; uint64_t start, end, data_offset; off_t offset; size_t length; int error = 0; buf_start = ap->a_offset; buf_len = ap->a_length; tbl = NULL; table_end = 0; issued_len = 0; dmv = dev->si_drv1; /* Select active table */ tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE); /* * 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; table_end = table_start + (table_en->length) * DEV_BSIZE; /* * Calculate the start and end */ start = MAX(table_start, buf_start); end = MIN(table_end, buf_start + buf_len); if (ap->a_length == 0) { if (table_en->target->dump == NULL) { error = ENXIO; goto out; } table_en->target->dump(table_en, NULL, 0, 0); } else if (start < end) { data_offset = start - buf_start; offset = start - table_start; length = end - start; if (table_en->target->dump == NULL) { error = ENXIO; goto out; } table_en->target->dump(table_en, (char *)ap->a_virtual + data_offset, length, offset); issued_len += end - start; } } if (issued_len < buf_len) error = EINVAL; out: dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE); return error; } static int dmsize(struct dev_psize_args *ap) { cdev_t dev = ap->a_head.a_dev; dm_dev_t *dmv; uint64_t size; size = 0; if ((dmv = dev->si_drv1) == NULL) return ENXIO; size = dm_table_size(&dmv->table_head); ap->a_result = (int64_t)size; return 0; } #if 0 static void dmminphys(struct buf *bp) { bp->b_bcount = MIN(bp->b_bcount, MAXPHYS); } #endif void dmsetdiskinfo(struct disk *disk, dm_table_head_t *head) { struct disk_info info; uint64_t dmp_size; dmp_size = dm_table_size(head); bzero(&info, sizeof(struct disk_info)); info.d_media_blksize = DEV_BSIZE; info.d_media_blocks = dmp_size; #if 0 /* this is set by disk_setdiskinfo */ info.d_media_size = dmp_size * DEV_BSIZE; #endif info.d_dsflags = DSO_MBRQUIET | DSO_DEVICEMAPPER | DSO_RAWPSIZE; info.d_secpertrack = 32; info.d_nheads = 64; info.d_secpercyl = info.d_secpertrack * info.d_nheads; info.d_ncylinders = dmp_size / info.d_secpercyl; disk_setdiskinfo(disk, &info); } /* * Transform char s to uint64_t offset number. */ uint64_t atoi64(const char *s) { uint64_t n; n = 0; while (*s != '\0') { if (!isdigit(*s)) break; n = (10 * n) + (*s - '0'); s++; } return n; } void dm_builtin_init(void *arg) { modeventhand_t evh = (modeventhand_t)arg; KKASSERT(evh != NULL); evh(NULL, MOD_LOAD, NULL); } void dm_builtin_uninit(void *arg) { modeventhand_t evh = (modeventhand_t)arg; KKASSERT(evh != NULL); evh(NULL, MOD_UNLOAD, NULL); } TUNABLE_INT("debug.dm_debug", &dm_debug_level); SYSCTL_INT(_debug, OID_AUTO, dm_debug, CTLFLAG_RW, &dm_debug_level, 0, "Enable device mapper debugging");