/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #include #include #include #include #include #include #include #include #define DISK_SUBPATH_MAX 100 #define RM_STALE 0x01 #define DISK_LINK_RE "^r?dsk/c[0-9]+(t[0-9A-F]+)?d[0-9]+(((s|p))[0-9]+)?$" #define DISK_LINK_TO_UPPER(ch)\ (((ch) >= 'a' && (ch) <= 'z') ? (ch - 'a' + 'A') : ch) #define SLICE_SMI "s7" #define SLICE_EFI "" #define MN_SMI "h" #define MN_EFI "wd" #define ASCIIWWNSIZE 255 #if defined(__i386) || defined(__amd64) /* * The number of minor nodes per LUN is defined by the disk drivers. * Currently it is set to 64. Refer CMLBUNIT_SHIFT (cmlb_impl.h) */ #define NUM_MINORS_PER_INSTANCE 64 #endif extern int system_labeled; static int disk_callback_chan(di_minor_t minor, di_node_t node); static int disk_callback_nchan(di_minor_t minor, di_node_t node); static int disk_callback_wwn(di_minor_t minor, di_node_t node); static int disk_callback_xvmd(di_minor_t minor, di_node_t node); static int disk_callback_fabric(di_minor_t minor, di_node_t node); static void disk_common(di_minor_t minor, di_node_t node, char *disk, int flags); static char *diskctrl(di_node_t node, di_minor_t minor); static int reserved_links_exist(di_node_t node, di_minor_t minor, int nflags); static devfsadm_create_t disk_cbt[] = { { "disk", "ddi_block", NULL, TYPE_EXACT, ILEVEL_0, disk_callback_nchan }, { "disk", "ddi_block:channel", NULL, TYPE_EXACT, ILEVEL_0, disk_callback_chan }, { "disk", "ddi_block:fabric", NULL, TYPE_EXACT, ILEVEL_0, disk_callback_fabric }, { "disk", "ddi_block:wwn", NULL, TYPE_EXACT, ILEVEL_0, disk_callback_wwn }, { "disk", "ddi_block:cdrom", NULL, TYPE_EXACT, ILEVEL_0, disk_callback_nchan }, { "disk", "ddi_block:cdrom:channel", NULL, TYPE_EXACT, ILEVEL_0, disk_callback_chan }, { "disk", "ddi_block:xvmd", NULL, TYPE_EXACT, ILEVEL_0, disk_callback_xvmd }, { "disk", "ddi_block:cdrom:xvmd", NULL, TYPE_EXACT, ILEVEL_0, disk_callback_xvmd }, }; DEVFSADM_CREATE_INIT_V0(disk_cbt); /* * HOT auto cleanup of disks not desired. */ static devfsadm_remove_t disk_remove_cbt[] = { { "disk", DISK_LINK_RE, RM_POST, ILEVEL_0, devfsadm_rm_all } }; DEVFSADM_REMOVE_INIT_V0(disk_remove_cbt); static devlink_re_t disks_re_array[] = { {"^r?dsk/c([0-9]+)", 1}, {"^cfg/c([0-9]+)$", 1}, {"^scsi/.+/c([0-9]+)", 1}, {NULL} }; static char *disk_mid = "disk_mid"; static char *modname = "disk_link"; int minor_init() { devfsadm_print(disk_mid, "%s: minor_init(): Creating disks reserved ID cache\n", modname); return (devfsadm_reserve_id_cache(disks_re_array, NULL)); } static int disk_callback_chan(di_minor_t minor, di_node_t node) { char *addr; char disk[20]; uint_t targ; uint_t lun; addr = di_bus_addr(node); (void) sscanf(addr, "%X,%X", &targ, &lun); (void) sprintf(disk, "t%dd%d", targ, lun); disk_common(minor, node, disk, 0); return (DEVFSADM_CONTINUE); } static int disk_callback_nchan(di_minor_t minor, di_node_t node) { char *addr; char disk[10]; uint_t lun; addr = di_bus_addr(node); (void) sscanf(addr, "%X", &lun); (void) sprintf(disk, "d%d", lun); disk_common(minor, node, disk, 0); return (DEVFSADM_CONTINUE); } static int disk_callback_wwn(di_minor_t minor, di_node_t node) { char disk[10]; int lun; int targ; int *intp; if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, "target", &intp) <= 0) { return (DEVFSADM_CONTINUE); } targ = *intp; if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, "lun", &intp) <= 0) { lun = 0; } else { lun = *intp; } (void) sprintf(disk, "t%dd%d", targ, lun); disk_common(minor, node, disk, RM_STALE); return (DEVFSADM_CONTINUE); } static int disk_callback_fabric(di_minor_t minor, di_node_t node) { char disk[DISK_SUBPATH_MAX]; int lun; int count; int *intp; uchar_t *str; uchar_t *wwn; uchar_t ascii_wwn[ASCIIWWNSIZE]; if (di_prop_lookup_strings(DDI_DEV_T_ANY, node, "client-guid", (char **)&wwn) > 0) { if (strlcpy((char *)ascii_wwn, (char *)wwn, sizeof (ascii_wwn)) >= sizeof (ascii_wwn)) { devfsadm_errprint("SUNW_disk_link: GUID too long:%d", strlen((char *)wwn)); return (DEVFSADM_CONTINUE); } lun = 0; } else if (di_prop_lookup_bytes(DDI_DEV_T_ANY, node, "port-wwn", &wwn) > 0) { if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, "lun", &intp) > 0) { lun = *intp; } else { lun = 0; } for (count = 0, str = ascii_wwn; count < 8; count++, str += 2) { (void) sprintf((caddr_t)str, "%02x", wwn[count]); } *str = '\0'; } else { return (DEVFSADM_CONTINUE); } for (str = ascii_wwn; *str != '\0'; str++) { *str = DISK_LINK_TO_UPPER(*str); } (void) snprintf(disk, DISK_SUBPATH_MAX, "t%sd%d", ascii_wwn, lun); disk_common(minor, node, disk, RM_STALE); return (DEVFSADM_CONTINUE); } /* * xVM virtual block device * * VBDs are enumerated into xenstore by xend and named using * the linux dev_t values for 'hd' and 'xvd' devices. Linux * dev_t's are 16-bit values. The upper 8 bits identify the major # * of the device (hd, xvd) and the lower 8 bits the instance and partition * * For PV guests, VBDs are named by the virt-tools using * the form xvd[a-p][1-15]. The corresponding Solaris /dev/dsk name * created by this generator will be c0t[0-15]d[0-15]sN, * were the target (t) value represents [a-p] and the * disk (d) value is either 0 (e.g. xvda) or contains the partition * information if it has been specified [1-15] (e.g. xvda1) * * For PV guests using the legacy naming (0, 1, 2, ...) * the Solaris disk names created will be c0d[0..767]sN * The Solaris version of virt-install based on virtinst.101 * named PV disks as sequential integers. With virtinst.300_1 and * beyond, the virt-* tools will no longer create legacy disk * names. */ static int disk_callback_xvmd(di_minor_t minor, di_node_t node) { #define HD_BASE (3 << 8) #define XVBDMAJ 202 char *addr; char disk[16]; uint_t targ; uint_t lun = 0; uint_t fmaj; addr = di_bus_addr(node); targ = strtol(addr, (char **)NULL, 10); fmaj = targ >> 8; /* legacy device address */ if (targ < HD_BASE) (void) snprintf(disk, sizeof (disk), "d%d", targ); /* PV VBD */ else if (fmaj == XVBDMAJ) { lun = targ & 0xf; targ = (targ & 0xff) >> 4; (void) snprintf(disk, sizeof (disk), "t%dd%d", targ, lun); /* HVM device names are generated using the standard generator */ } else { devfsadm_errprint("%s: invalid disk device number (%s)\n", modname, addr); return (DEVFSADM_CONTINUE); } disk_common(minor, node, disk, 0); return (DEVFSADM_CONTINUE); } /* * This function is called for every disk minor node. * Calls enumerate to assign a logical controller number, and * then devfsadm_mklink to make the link. */ static void disk_common(di_minor_t minor, di_node_t node, char *disk, int flags) { char l_path[PATH_MAX + 1]; char sec_path[PATH_MAX + 1]; char stale_re[DISK_SUBPATH_MAX]; char *dir; char slice[4]; char *mn; char *ctrl; char *nt = NULL; int *int_prop; int nflags = 0; #if defined(__i386) || defined(__amd64) char mn_copy[4]; char *part; int part_num; #endif mn = di_minor_name(minor); if (strstr(mn, ",raw")) { dir = "rdsk"; #if defined(__i386) || defined(__amd64) (void) strncpy(mn_copy, mn, 4); part = strtok(mn_copy, ","); #endif } else { dir = "dsk"; #if defined(__i386) || defined(__amd64) part = mn; #endif } #if defined(__i386) || defined(__amd64) /* * The following is a table describing the allocation of * minor numbers, minor names and /dev/dsk names for partitions * and slices on x86 systems. * * Minor Number Minor Name /dev/dsk name * --------------------------------------------- * 0 to 15 "a" to "p" s0 to s15 * 16 "q" p0 * 17 to 20 "r" to "u" p1 to p4 * 21 to 52 "p5" to "p36" p5 to p36 * */ part_num = atoi(part + 1); if ((mn[0] == 'p') && (part_num >= 5)) { /* logical drive */ (void) snprintf(slice, 4, "%s", part); } else { #endif if (mn[0] < 'q') { (void) sprintf(slice, "s%d", mn[0] - 'a'); } else if (strncmp(mn, MN_EFI, 2) != 0) { (void) sprintf(slice, "p%d", mn[0] - 'q'); } else { /* For EFI label */ (void) sprintf(slice, SLICE_EFI); } #if defined(__i386) || defined(__amd64) } #endif nflags = 0; if (system_labeled) { nt = di_minor_nodetype(minor); if ((nt != NULL) && ((strcmp(nt, DDI_NT_CD) == 0) || (strcmp(nt, DDI_NT_CD_CHAN) == 0) || (strcmp(nt, DDI_NT_BLOCK_CHAN) == 0))) { nflags = DA_ADD|DA_CD; } } if (reserved_links_exist(node, minor, nflags) == DEVFSADM_SUCCESS) { devfsadm_print(disk_mid, "Reserved link exists. Not " "creating links for slice %s\n", slice); return; } if (NULL == (ctrl = diskctrl(node, minor))) return; (void) strcpy(l_path, dir); (void) strcat(l_path, "/c"); (void) strcat(l_path, ctrl); (void) strcat(l_path, disk); /* * If switching between SMI and EFI label or vice versa * cleanup the previous label's devlinks. */ if (*mn == *(MN_SMI) || (strncmp(mn, MN_EFI, 2) == 0)) { char *s, tpath[PATH_MAX + 1]; struct stat sb; s = l_path + strlen(l_path); (void) strcat(l_path, (*mn == *(MN_SMI)) ? SLICE_EFI : SLICE_SMI); /* * Attempt the remove only if the stale link exists */ (void) snprintf(tpath, sizeof (tpath), "%s/dev/%s", devfsadm_root_path(), l_path); if (lstat(tpath, &sb) != -1) devfsadm_rm_all(l_path); *s = '\0'; } (void) strcat(l_path, slice); (void) devfsadm_mklink(l_path, node, minor, nflags); /* secondary links for removable and hotpluggable devices */ if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, "removable-media", &int_prop) >= 0) { (void) strcpy(sec_path, "removable-media/"); (void) strcat(sec_path, l_path); (void) devfsadm_secondary_link(sec_path, l_path, 0); } if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, "hotpluggable", &int_prop) >= 0) { (void) strcpy(sec_path, "hotpluggable/"); (void) strcat(sec_path, l_path); (void) devfsadm_secondary_link(sec_path, l_path, 0); } if ((flags & RM_STALE) == RM_STALE) { (void) strcpy(stale_re, "^"); (void) strcat(stale_re, dir); (void) strcat(stale_re, "/c"); (void) strcat(stale_re, ctrl); (void) strcat(stale_re, "t[0-9A-F]+d[0-9]+(s[0-9]+)?$"); /* * optimizations are made inside of devfsadm_rm_stale_links * instead of before calling the function, as it always * needs to add the valid link to the cache. */ devfsadm_rm_stale_links(stale_re, l_path, node, minor); } free(ctrl); } /* index of enumeration rule applicable to this module */ #define RULE_INDEX 0 static char * diskctrl(di_node_t node, di_minor_t minor) { char path[PATH_MAX + 1]; char *devfspath; char *buf, *mn; devfsadm_enumerate_t rules[3] = { {"^r?dsk$/^c([0-9]+)", 1, MATCH_PARENT}, {"^cfg$/^c([0-9]+)$", 1, MATCH_ADDR}, {"^scsi$/^.+$/^c([0-9]+)", 1, MATCH_PARENT} }; mn = di_minor_name(minor); if ((devfspath = di_devfs_path(node)) == NULL) { return (NULL); } (void) strcpy(path, devfspath); (void) strcat(path, ":"); (void) strcat(path, mn); di_devfs_path_free(devfspath); /* * Use controller component of disk path */ if (disk_enumerate_int(path, RULE_INDEX, &buf, rules, 3) == DEVFSADM_MULTIPLE) { /* * We failed because there are multiple logical controller * numbers for a single physical controller. If we use node * name also in the match it should fix this and only find one * logical controller. (See 4045879). * NOTE: Rules for controllers are not changed, as there is * no unique controller number for them in this case. * * MATCH_UNCACHED flag is private to the "disks" and "sgen" * modules. NOT to be used by other modules. */ rules[0].flags = MATCH_NODE | MATCH_UNCACHED; /* disks */ rules[2].flags = MATCH_NODE | MATCH_UNCACHED; /* generic scsi */ if (devfsadm_enumerate_int(path, RULE_INDEX, &buf, rules, 3)) { return (NULL); } } return (buf); } typedef struct dvlist { char *dv_link; struct dvlist *dv_next; } dvlist_t; static void free_dvlist(dvlist_t **pp) { dvlist_t *entry; while (*pp) { entry = *pp; *pp = entry->dv_next; assert(entry->dv_link); free(entry->dv_link); free(entry); } } static int dvlink_cb(di_devlink_t devlink, void *arg) { char *path; char *can_path; dvlist_t **pp = (dvlist_t **)arg; dvlist_t *entry = NULL; entry = calloc(1, sizeof (dvlist_t)); if (entry == NULL) { devfsadm_errprint("%s: calloc failed\n", modname); goto error; } path = (char *)di_devlink_path(devlink); assert(path); if (path == NULL) { devfsadm_errprint("%s: di_devlink_path() returned NULL\n", modname); goto error; } devfsadm_print(disk_mid, "%s: found link %s in reverse link cache\n", modname, path); /* * Return linkname in canonical form i.e. without the * "/dev/" prefix */ can_path = strstr(path, "/dev/"); if (can_path == NULL) { devfsadm_errprint("%s: devlink path %s has no /dev/\n", modname, path); goto error; } entry->dv_link = s_strdup(can_path + strlen("/dev/")); entry->dv_next = *pp; *pp = entry; return (DI_WALK_CONTINUE); error: free(entry); free_dvlist(pp); *pp = NULL; return (DI_WALK_TERMINATE); } /* * Returns success only if all goes well. If there is no matching reserved link * or if there is an error, we assume no match. It is better to err on the side * of caution by creating extra links than to miss out creating a required link. */ static int reserved_links_exist(di_node_t node, di_minor_t minor, int nflags) { di_devlink_handle_t dvlink_cache = devfsadm_devlink_cache(); char phys_path[PATH_MAX]; char *minor_path; dvlist_t *head; dvlist_t *entry; char *s; char l[PATH_MAX]; int switch_link = 0; char *mn = di_minor_name(minor); if (dvlink_cache == NULL || mn == NULL) { devfsadm_errprint("%s: No minor or devlink cache\n", modname); return (DEVFSADM_FAILURE); } if (!devfsadm_have_reserved()) { devfsadm_print(disk_mid, "%s: No reserved links\n", modname); return (DEVFSADM_FAILURE); } minor_path = di_devfs_minor_path(minor); if (minor_path == NULL) { devfsadm_errprint("%s: di_devfs_minor_path failed\n", modname); return (DEVFSADM_FAILURE); } (void) strlcpy(phys_path, minor_path, sizeof (phys_path)); di_devfs_path_free(minor_path); head = NULL; (void) di_devlink_cache_walk(dvlink_cache, DISK_LINK_RE, phys_path, DI_PRIMARY_LINK, &head, dvlink_cb); /* * We may be switching between EFI label and SMI label in which case * we only have minors of the other type. */ if (head == NULL && (*mn == *(MN_SMI) || (strncmp(mn, MN_EFI, 2) == 0))) { devfsadm_print(disk_mid, "%s: No links for minor %s in /dev. " "Trying another label\n", modname, mn); s = strrchr(phys_path, ':'); if (s == NULL) { devfsadm_errprint("%s: invalid minor path: %s\n", modname, phys_path); return (DEVFSADM_FAILURE); } (void) snprintf(s+1, sizeof (phys_path) - (s + 1 - phys_path), "%s%s", *mn == *(MN_SMI) ? MN_EFI : MN_SMI, strstr(s, ",raw") ? ",raw" : ""); (void) di_devlink_cache_walk(dvlink_cache, DISK_LINK_RE, phys_path, DI_PRIMARY_LINK, &head, dvlink_cb); } if (head == NULL) { devfsadm_print(disk_mid, "%s: minor %s has no links in /dev\n", modname, phys_path); /* no links on disk */ return (DEVFSADM_FAILURE); } /* * It suffices to use 1 link to this minor, since * we are matching with reserved IDs on the basis of * the controller number which will be the same for * all links to this minor. */ if (!devfsadm_is_reserved(disks_re_array, head->dv_link)) { /* not reserved links */ devfsadm_print(disk_mid, "%s: devlink %s and its minor " "are NOT reserved\n", modname, head->dv_link); free_dvlist(&head); return (DEVFSADM_FAILURE); } devfsadm_print(disk_mid, "%s: devlink %s and its minor are on " "reserved list\n", modname, head->dv_link); /* * Switch between SMI and EFI labels if required */ switch_link = 0; if (*mn == *(MN_SMI) || (strncmp(mn, MN_EFI, 2) == 0)) { for (entry = head; entry; entry = entry->dv_next) { s = strrchr(entry->dv_link, '/'); assert(s); if (s == NULL) { devfsadm_errprint("%s: disk link %s has no " "directory\n", modname, entry->dv_link); continue; } if (*mn == *(MN_SMI) && strchr(s, 's') == NULL) { (void) snprintf(l, sizeof (l), "%s%s", entry->dv_link, SLICE_SMI); switch_link = 1; devfsadm_print(disk_mid, "%s: switching " "reserved link from EFI to SMI label. " "New link is %s\n", modname, l); } else if (strncmp(mn, MN_EFI, 2) == 0 && (s = strchr(s, 's'))) { *s = '\0'; (void) snprintf(l, sizeof (l), "%s", entry->dv_link); *s = 's'; switch_link = 1; devfsadm_print(disk_mid, "%s: switching " "reserved link from SMI to EFI label. " "New link is %s\n", modname, l); } if (switch_link) { devfsadm_print(disk_mid, "%s: switching " "link: deleting %s and creating %s\n", modname, entry->dv_link, l); devfsadm_rm_link(entry->dv_link); (void) devfsadm_mklink(l, node, minor, nflags); } } } free_dvlist(&head); /* * return SUCCESS to indicate that new links to this minor should not * be created so that only compatibility links to this minor remain. */ return (DEVFSADM_SUCCESS); }