539 lines
12 KiB
C
539 lines
12 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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*/
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#include <ctype.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/efi_partition.h>
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#ifdef HAVE_LIBUDEV
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#include <libudev.h>
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#endif
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#include <libzutil.h>
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/*
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* Append partition suffix to an otherwise fully qualified device path.
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* This is used to generate the name the full path as its stored in
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* ZPOOL_CONFIG_PATH for whole disk devices. On success the new length
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* of 'path' will be returned on error a negative value is returned.
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*/
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int
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zfs_append_partition(char *path, size_t max_len)
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{
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int len = strlen(path);
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if ((strncmp(path, UDISK_ROOT, strlen(UDISK_ROOT)) == 0) ||
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(strncmp(path, ZVOL_ROOT, strlen(ZVOL_ROOT)) == 0)) {
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if (len + 6 >= max_len)
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return (-1);
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(void) strcat(path, "-part1");
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len += 6;
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} else {
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if (len + 2 >= max_len)
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return (-1);
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if (isdigit(path[len-1])) {
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(void) strcat(path, "p1");
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len += 2;
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} else {
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(void) strcat(path, "1");
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len += 1;
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}
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}
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return (len);
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}
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/*
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* Remove partition suffix from a vdev path. Partition suffixes may take three
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* forms: "-partX", "pX", or "X", where X is a string of digits. The second
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* case only occurs when the suffix is preceded by a digit, i.e. "md0p0" The
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* third case only occurs when preceded by a string matching the regular
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* expression "^([hsv]|xv)d[a-z]+", i.e. a scsi, ide, virtio or xen disk.
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*
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* caller must free the returned string
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*/
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char *
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zfs_strip_partition(char *path)
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{
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char *tmp = strdup(path);
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char *part = NULL, *d = NULL;
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if (!tmp)
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return (NULL);
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if ((part = strstr(tmp, "-part")) && part != tmp) {
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d = part + 5;
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} else if ((part = strrchr(tmp, 'p')) &&
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part > tmp + 1 && isdigit(*(part-1))) {
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d = part + 1;
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} else if ((tmp[0] == 'h' || tmp[0] == 's' || tmp[0] == 'v') &&
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tmp[1] == 'd') {
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for (d = &tmp[2]; isalpha(*d); part = ++d) { }
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} else if (strncmp("xvd", tmp, 3) == 0) {
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for (d = &tmp[3]; isalpha(*d); part = ++d) { }
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}
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if (part && d && *d != '\0') {
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for (; isdigit(*d); d++) { }
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if (*d == '\0')
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*part = '\0';
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}
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return (tmp);
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}
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/*
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* Same as zfs_strip_partition, but allows "/dev/" to be in the pathname
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*
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* path: /dev/sda1
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* returns: /dev/sda
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*
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* Returned string must be freed.
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*/
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static char *
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zfs_strip_partition_path(char *path)
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{
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char *newpath = strdup(path);
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char *sd_offset;
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char *new_sd;
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if (!newpath)
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return (NULL);
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/* Point to "sda1" part of "/dev/sda1" */
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sd_offset = strrchr(newpath, '/') + 1;
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/* Get our new name "sda" */
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new_sd = zfs_strip_partition(sd_offset);
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if (!new_sd) {
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free(newpath);
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return (NULL);
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}
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/* Paste the "sda" where "sda1" was */
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strlcpy(sd_offset, new_sd, strlen(sd_offset) + 1);
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/* Free temporary "sda" */
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free(new_sd);
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return (newpath);
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}
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/*
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* Strip the unwanted portion of a device path.
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*/
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char *
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zfs_strip_path(char *path)
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{
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return (strrchr(path, '/') + 1);
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}
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/*
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* Given a dev name like "sda", return the full enclosure sysfs path to
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* the disk. You can also pass in the name with "/dev" prepended
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* to it (like /dev/sda).
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*
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* For example, disk "sda" in enclosure slot 1:
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* dev: "sda"
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* returns: "/sys/class/enclosure/1:0:3:0/Slot 1"
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*
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* 'dev' must be a non-devicemapper device.
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*
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* Returned string must be freed.
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*/
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char *
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zfs_get_enclosure_sysfs_path(const char *dev_name)
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{
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DIR *dp = NULL;
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struct dirent *ep;
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char buf[MAXPATHLEN];
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char *tmp1 = NULL;
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char *tmp2 = NULL;
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char *tmp3 = NULL;
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char *path = NULL;
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size_t size;
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int tmpsize;
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if (dev_name == NULL)
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return (NULL);
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/* If they preface 'dev' with a path (like "/dev") then strip it off */
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tmp1 = strrchr(dev_name, '/');
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if (tmp1 != NULL)
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dev_name = tmp1 + 1; /* +1 since we want the chr after '/' */
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tmpsize = asprintf(&tmp1, "/sys/block/%s/device", dev_name);
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if (tmpsize == -1 || tmp1 == NULL) {
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tmp1 = NULL;
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goto end;
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}
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dp = opendir(tmp1);
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if (dp == NULL)
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goto end;
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/*
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* Look though all sysfs entries in /sys/block/<dev>/device for
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* the enclosure symlink.
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*/
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while ((ep = readdir(dp))) {
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/* Ignore everything that's not our enclosure_device link */
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if (strstr(ep->d_name, "enclosure_device") == NULL)
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continue;
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if (asprintf(&tmp2, "%s/%s", tmp1, ep->d_name) == -1) {
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tmp2 = NULL;
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break;
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}
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size = readlink(tmp2, buf, sizeof (buf));
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/* Did readlink fail or crop the link name? */
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if (size == -1 || size >= sizeof (buf))
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break;
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/*
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* We got a valid link. readlink() doesn't terminate strings
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* so we have to do it.
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*/
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buf[size] = '\0';
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/*
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* Our link will look like:
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*
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* "../../../../port-11:1:2/..STUFF../enclosure/1:0:3:0/SLOT 1"
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*
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* We want to grab the "enclosure/1:0:3:0/SLOT 1" part
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*/
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tmp3 = strstr(buf, "enclosure");
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if (tmp3 == NULL)
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break;
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if (asprintf(&path, "/sys/class/%s", tmp3) == -1) {
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/* If asprintf() fails, 'path' is undefined */
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path = NULL;
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break;
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}
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if (path == NULL)
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break;
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}
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end:
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free(tmp2);
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free(tmp1);
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if (dp != NULL)
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closedir(dp);
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return (path);
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}
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/*
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* Allocate and return the underlying device name for a device mapper device.
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*
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* For example, dm_name = "/dev/dm-0" could return "/dev/sda". Symlinks to a
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* DM device (like /dev/disk/by-vdev/A0) are also allowed.
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*
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* If the DM device has multiple underlying devices (like with multipath
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* DM devices), then favor underlying devices that have a symlink back to their
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* back to their enclosure device in sysfs. This will be useful for the
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* zedlet scripts that toggle the fault LED.
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*
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* Returns an underlying device name, or NULL on error or no match. If dm_name
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* is not a DM device then return NULL.
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*
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* NOTE: The returned name string must be *freed*.
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*/
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static char *
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dm_get_underlying_path(const char *dm_name)
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{
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DIR *dp = NULL;
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struct dirent *ep;
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char *realp;
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char *tmp = NULL;
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char *path = NULL;
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char *dev_str;
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int size;
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char *first_path = NULL;
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char *enclosure_path;
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if (dm_name == NULL)
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return (NULL);
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/* dm name may be a symlink (like /dev/disk/by-vdev/A0) */
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realp = realpath(dm_name, NULL);
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if (realp == NULL)
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return (NULL);
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/*
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* If they preface 'dev' with a path (like "/dev") then strip it off.
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* We just want the 'dm-N' part.
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*/
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tmp = strrchr(realp, '/');
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if (tmp != NULL)
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dev_str = tmp + 1; /* +1 since we want the chr after '/' */
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else
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dev_str = tmp;
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if ((size = asprintf(&tmp, "/sys/block/%s/slaves/", dev_str)) == -1) {
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tmp = NULL;
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goto end;
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}
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dp = opendir(tmp);
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if (dp == NULL)
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goto end;
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/*
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* A device-mapper device can have multiple paths to it (multipath).
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* Favor paths that have a symlink back to their enclosure device.
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* We have to do this since some enclosures may only provide a symlink
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* back for one underlying path to a disk and not the other.
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*
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* If no paths have links back to their enclosure, then just return the
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* first path.
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*/
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while ((ep = readdir(dp))) {
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if (ep->d_type != DT_DIR) { /* skip "." and ".." dirs */
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if (!first_path)
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first_path = strdup(ep->d_name);
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enclosure_path =
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zfs_get_enclosure_sysfs_path(ep->d_name);
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if (!enclosure_path)
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continue;
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if ((size = asprintf(
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&path, "/dev/%s", ep->d_name)) == -1)
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path = NULL;
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free(enclosure_path);
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break;
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}
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}
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end:
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if (dp != NULL)
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closedir(dp);
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free(tmp);
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free(realp);
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if (!path && first_path) {
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/*
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* None of the underlying paths had a link back to their
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* enclosure devices. Throw up out hands and return the first
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* underlying path.
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*/
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if ((size = asprintf(&path, "/dev/%s", first_path)) == -1)
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path = NULL;
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}
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free(first_path);
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return (path);
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}
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/*
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* Return B_TRUE if device is a device mapper or multipath device.
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* Return B_FALSE if not.
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*/
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boolean_t
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zfs_dev_is_dm(const char *dev_name)
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{
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char *tmp;
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tmp = dm_get_underlying_path(dev_name);
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if (tmp == NULL)
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return (B_FALSE);
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free(tmp);
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return (B_TRUE);
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}
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/*
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* By "whole disk" we mean an entire physical disk (something we can
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* label, toggle the write cache on, etc.) as opposed to the full
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* capacity of a pseudo-device such as lofi or did. We act as if we
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* are labeling the disk, which should be a pretty good test of whether
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* it's a viable device or not. Returns B_TRUE if it is and B_FALSE if
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* it isn't.
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*/
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boolean_t
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zfs_dev_is_whole_disk(const char *dev_name)
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{
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struct dk_gpt *label;
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int fd;
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if ((fd = open(dev_name, O_RDONLY | O_DIRECT | O_CLOEXEC)) < 0)
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return (B_FALSE);
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if (efi_alloc_and_init(fd, EFI_NUMPAR, &label) != 0) {
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(void) close(fd);
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return (B_FALSE);
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}
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efi_free(label);
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(void) close(fd);
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return (B_TRUE);
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}
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/*
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* Lookup the underlying device for a device name
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*
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* Often you'll have a symlink to a device, a partition device,
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* or a multipath device, and want to look up the underlying device.
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* This function returns the underlying device name. If the device
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* name is already the underlying device, then just return the same
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* name. If the device is a DM device with multiple underlying devices
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* then return the first one.
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*
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* For example:
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*
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* 1. /dev/disk/by-id/ata-QEMU_HARDDISK_QM00001 -> ../../sda
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* dev_name: /dev/disk/by-id/ata-QEMU_HARDDISK_QM00001
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* returns: /dev/sda
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*
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* 2. /dev/mapper/mpatha (made up of /dev/sda and /dev/sdb)
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* dev_name: /dev/mapper/mpatha
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* returns: /dev/sda (first device)
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*
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* 3. /dev/sda (already the underlying device)
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* dev_name: /dev/sda
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* returns: /dev/sda
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*
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* 4. /dev/dm-3 (mapped to /dev/sda)
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* dev_name: /dev/dm-3
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* returns: /dev/sda
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*
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* 5. /dev/disk/by-id/scsi-0QEMU_drive-scsi0-0-0-0-part9 -> ../../sdb9
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* dev_name: /dev/disk/by-id/scsi-0QEMU_drive-scsi0-0-0-0-part9
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* returns: /dev/sdb
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*
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* 6. /dev/disk/by-uuid/5df030cf-3cd9-46e4-8e99-3ccb462a4e9a -> ../dev/sda2
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* dev_name: /dev/disk/by-uuid/5df030cf-3cd9-46e4-8e99-3ccb462a4e9a
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* returns: /dev/sda
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*
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* Returns underlying device name, or NULL on error or no match.
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*
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* NOTE: The returned name string must be *freed*.
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*/
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char *
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zfs_get_underlying_path(const char *dev_name)
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{
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char *name = NULL;
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char *tmp;
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if (dev_name == NULL)
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return (NULL);
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tmp = dm_get_underlying_path(dev_name);
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/* dev_name not a DM device, so just un-symlinkize it */
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if (tmp == NULL)
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tmp = realpath(dev_name, NULL);
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if (tmp != NULL) {
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name = zfs_strip_partition_path(tmp);
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free(tmp);
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}
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return (name);
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}
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#ifdef HAVE_LIBUDEV
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/*
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* A disk is considered a multipath whole disk when:
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* DEVNAME key value has "dm-"
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* DM_NAME key value has "mpath" prefix
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* DM_UUID key exists
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* ID_PART_TABLE_TYPE key does not exist or is not gpt
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*/
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static boolean_t
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udev_mpath_whole_disk(struct udev_device *dev)
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{
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const char *devname, *type, *uuid;
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devname = udev_device_get_property_value(dev, "DEVNAME");
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type = udev_device_get_property_value(dev, "ID_PART_TABLE_TYPE");
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uuid = udev_device_get_property_value(dev, "DM_UUID");
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if ((devname != NULL && strncmp(devname, "/dev/dm-", 8) == 0) &&
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((type == NULL) || (strcmp(type, "gpt") != 0)) &&
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(uuid != NULL)) {
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return (B_TRUE);
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}
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return (B_FALSE);
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}
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/*
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* Check if a disk is effectively a multipath whole disk
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*/
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boolean_t
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is_mpath_whole_disk(const char *path)
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{
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struct udev *udev;
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struct udev_device *dev = NULL;
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char nodepath[MAXPATHLEN];
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char *sysname;
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boolean_t wholedisk = B_FALSE;
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if (realpath(path, nodepath) == NULL)
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return (B_FALSE);
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sysname = strrchr(nodepath, '/') + 1;
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if (strncmp(sysname, "dm-", 3) != 0)
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return (B_FALSE);
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if ((udev = udev_new()) == NULL)
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return (B_FALSE);
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if ((dev = udev_device_new_from_subsystem_sysname(udev, "block",
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sysname)) == NULL) {
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udev_device_unref(dev);
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return (B_FALSE);
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}
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wholedisk = udev_mpath_whole_disk(dev);
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udev_device_unref(dev);
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return (wholedisk);
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}
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#else /* HAVE_LIBUDEV */
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/* ARGSUSED */
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boolean_t
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is_mpath_whole_disk(const char *path)
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{
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return (B_FALSE);
|
|
}
|
|
|
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#endif /* HAVE_LIBUDEV */
|