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-rw-r--r--usr/kinit/do_mounts_md.c400
1 files changed, 400 insertions, 0 deletions
diff --git a/usr/kinit/do_mounts_md.c b/usr/kinit/do_mounts_md.c
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--- /dev/null
+++ b/usr/kinit/do_mounts_md.c
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+/*
+ * Handle autoconfiguration of md devices. This is ugly, partially since
+ * it still relies on a sizable kernel component.
+ *
+ * This file is derived from the Linux kernel.
+ */
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <sys/sysmacros.h>
+#include <sys/md.h>
+#include <linux/major.h>
+
+#include "kinit.h"
+#include "do_mounts.h"
+
+#define LEVEL_NONE (-1000000)
+
+/*
+ * When md (and any require personalities) are compiled into the kernel
+ * (not a module), arrays can be assembles are boot time using with AUTODETECT
+ * where specially marked partitions are registered with md_autodetect_dev(),
+ * and with MD_BOOT where devices to be collected are given on the boot line
+ * with md=.....
+ * The code for that is here.
+ */
+
+static int raid_noautodetect, raid_autopart;
+
+static struct {
+ int minor;
+ int partitioned;
+ int level;
+ int chunk;
+ char *device_names;
+} md_setup_args[MAX_MD_DEVS];
+
+static int md_setup_ents;
+
+/**
+ * get_option - Parse integer from an option string
+ * @str: option string
+ * @pint: (output) integer value parsed from @str
+ *
+ * Read an int from an option string; if available accept a subsequent
+ * comma as well.
+ *
+ * Return values:
+ * 0 : no int in string
+ * 1 : int found, no subsequent comma
+ * 2 : int found including a subsequent comma
+ */
+
+static int get_option(char **str, int *pint)
+{
+ char *cur = *str;
+
+ if (!cur || !(*cur))
+ return 0;
+ *pint = strtol(cur, str, 0);
+ if (cur == *str)
+ return 0;
+ if (**str == ',') {
+ (*str)++;
+ return 2;
+ }
+
+ return 1;
+}
+
+/*
+ * Find the partitioned md device major number... of course this *HAD*
+ * to be done dynamically instead of using a registered number.
+ * Sigh. Double sigh.
+ */
+static int mdp_major(void)
+{
+ static int found = 0;
+ FILE *f;
+ char line[512], *p;
+ int is_blk, major_no;
+
+ if (found)
+ return found;
+
+ f = fopen("/proc/devices", "r");
+ is_blk = 0;
+ while (fgets(line, sizeof line, f)) {
+ if (!strcmp(line, "Block devices:\n"))
+ is_blk = 1;
+ if (is_blk) {
+ major_no = strtol(line, &p, 10);
+ while (*p && isspace(*p))
+ p++;
+
+ if (major_no == 0) /* Not a number */
+ is_blk = 0;
+ else if (major_no > 0 && !strcmp(p, "mdp")) {
+ found = major_no;
+ break;
+ }
+ }
+ }
+ fclose(f);
+
+ if (!found) {
+ fprintf(stderr,
+ "Error: mdp devices detected but no mdp device found!\n");
+ exit(1);
+ }
+
+ return found;
+}
+
+/*
+ * Parse the command-line parameters given our kernel, but do not
+ * actually try to invoke the MD device now; that is handled by
+ * md_setup_drive after the low-level disk drivers have initialised.
+ *
+ * 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
+ * assigns the task of parsing integer arguments to the
+ * invoked program now). Added ability to initialise all
+ * the MD devices (by specifying multiple "md=" lines)
+ * instead of just one. -- KTK
+ * 18May2000: Added support for persistent-superblock arrays:
+ * md=n,0,factor,fault,device-list uses RAID0 for device n
+ * md=n,-1,factor,fault,device-list uses LINEAR for device n
+ * md=n,device-list reads a RAID superblock from the devices
+ * elements in device-list are read by name_to_kdev_t so can be
+ * a hex number or something like /dev/hda1 /dev/sdb
+ * 2001-06-03: Dave Cinege <dcinege@psychosis.com>
+ * Shifted name_to_kdev_t() and related operations to md_set_drive()
+ * for later execution. Rewrote section to make devfs compatible.
+ */
+static int md_setup(char *str)
+{
+ int minor_num, level, factor, fault, partitioned = 0;
+ char *pername = "";
+ char *str1;
+ int ent;
+
+ if (*str == 'd') {
+ partitioned = 1;
+ str++;
+ }
+ if (get_option(&str, &minor_num) != 2) { /* MD Number */
+ fprintf(stderr, "md: Too few arguments supplied to md=.\n");
+ return 0;
+ }
+ str1 = str;
+ if (minor_num >= MAX_MD_DEVS) {
+ fprintf(stderr, "md: md=%d, Minor device number too high.\n",
+ minor_num);
+ return 0;
+ }
+ for (ent = 0; ent < md_setup_ents; ent++)
+ if (md_setup_args[ent].minor == minor_num &&
+ md_setup_args[ent].partitioned == partitioned) {
+ fprintf(stderr,
+ "md: md=%s%d, Specified more than once. "
+ "Replacing previous definition.\n",
+ partitioned ? "d" : "", minor_num);
+ break;
+ }
+ if (ent >= MAX_MD_DEVS) {
+ fprintf(stderr, "md: md=%s%d - too many md initialisations\n",
+ partitioned ? "d" : "", minor_num);
+ return 0;
+ }
+ if (ent >= md_setup_ents)
+ md_setup_ents++;
+ switch (get_option(&str, &level)) { /* RAID level */
+ case 2: /* could be 0 or -1.. */
+ if (level == 0 || level == LEVEL_LINEAR) {
+ if (get_option(&str, &factor) != 2 || /* Chunk Size */
+ get_option(&str, &fault) != 2) {
+ fprintf(stderr,
+ "md: Too few arguments supplied to md=.\n");
+ return 0;
+ }
+ md_setup_args[ent].level = level;
+ md_setup_args[ent].chunk = 1 << (factor + 12);
+ if (level == LEVEL_LINEAR)
+ pername = "linear";
+ else
+ pername = "raid0";
+ break;
+ }
+ /* FALL THROUGH */
+ case 1: /* the first device is numeric */
+ str = str1;
+ /* FALL THROUGH */
+ case 0:
+ md_setup_args[ent].level = LEVEL_NONE;
+ pername = "super-block";
+ }
+
+ fprintf(stderr, "md: Will configure md%s%d (%s) from %s, below.\n",
+ partitioned ? "_d" : "", minor_num, pername, str);
+ md_setup_args[ent].device_names = str;
+ md_setup_args[ent].partitioned = partitioned;
+ md_setup_args[ent].minor = minor_num;
+
+ return 1;
+}
+
+#define MdpMinorShift 6
+
+static void md_setup_drive(void)
+{
+ int dev_minor, i, ent, partitioned;
+ dev_t dev;
+ dev_t devices[MD_SB_DISKS + 1];
+
+ for (ent = 0; ent < md_setup_ents; ent++) {
+ int fd;
+ int err = 0;
+ char *devname;
+ mdu_disk_info_t dinfo;
+ char name[16];
+ struct stat st_chk;
+
+ dev_minor = md_setup_args[ent].minor;
+ partitioned = md_setup_args[ent].partitioned;
+ devname = md_setup_args[ent].device_names;
+
+ snprintf(name, sizeof name,
+ "/dev/md%s%d", partitioned ? "_d" : "", dev_minor);
+
+ if (stat(name, &st_chk) == 0)
+ continue;
+
+ if (partitioned)
+ dev = makedev(mdp_major(), dev_minor << MdpMinorShift);
+ else
+ dev = makedev(MD_MAJOR, dev_minor);
+ create_dev(name, dev);
+ for (i = 0; i < MD_SB_DISKS && devname != 0; i++) {
+ char *p;
+
+ p = strchr(devname, ',');
+ if (p)
+ *p++ = 0;
+
+ dev = name_to_dev_t(devname);
+ if (!dev) {
+ fprintf(stderr, "md: Unknown device name: %s\n",
+ devname);
+ break;
+ }
+
+ devices[i] = dev;
+
+ devname = p;
+ }
+ devices[i] = 0;
+
+ if (!i)
+ continue;
+
+ fprintf(stderr, "md: Loading md%s%d: %s\n",
+ partitioned ? "_d" : "", dev_minor,
+ md_setup_args[ent].device_names);
+
+ fd = open(name, 0, 0);
+ if (fd < 0) {
+ fprintf(stderr, "md: open failed - cannot start "
+ "array %s\n", name);
+ continue;
+ }
+ if (ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
+ fprintf(stderr,
+ "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
+ dev_minor);
+ close(fd);
+ continue;
+ }
+
+ if (md_setup_args[ent].level != LEVEL_NONE) {
+ /* non-persistent */
+ mdu_array_info_t ainfo;
+ ainfo.level = md_setup_args[ent].level;
+ ainfo.size = 0;
+ ainfo.nr_disks = 0;
+ ainfo.raid_disks = 0;
+ while (devices[ainfo.raid_disks])
+ ainfo.raid_disks++;
+ ainfo.md_minor = dev_minor;
+ ainfo.not_persistent = 1;
+
+ ainfo.state = (1 << MD_SB_CLEAN);
+ ainfo.layout = 0;
+ ainfo.chunk_size = md_setup_args[ent].chunk;
+ err = ioctl(fd, SET_ARRAY_INFO, &ainfo);
+ for (i = 0; !err && i <= MD_SB_DISKS; i++) {
+ dev = devices[i];
+ if (!dev)
+ break;
+ dinfo.number = i;
+ dinfo.raid_disk = i;
+ dinfo.state =
+ (1 << MD_DISK_ACTIVE) | (1 << MD_DISK_SYNC);
+ dinfo.major = major(dev);
+ dinfo.minor = minor(dev);
+ err = ioctl(fd, ADD_NEW_DISK, &dinfo);
+ }
+ } else {
+ /* persistent */
+ for (i = 0; i <= MD_SB_DISKS; i++) {
+ dev = devices[i];
+ if (!dev)
+ break;
+ dinfo.major = major(dev);
+ dinfo.minor = minor(dev);
+ ioctl(fd, ADD_NEW_DISK, &dinfo);
+ }
+ }
+ if (!err)
+ err = ioctl(fd, RUN_ARRAY, 0);
+ if (err)
+ fprintf(stderr, "md: starting md%d failed\n",
+ dev_minor);
+ else {
+ /* reread the partition table.
+ * I (neilb) and not sure why this is needed, but I
+ * cannot boot a kernel with devfs compiled in from
+ * partitioned md array without it
+ */
+ close(fd);
+ fd = open(name, 0, 0);
+ ioctl(fd, BLKRRPART, 0);
+ }
+ close(fd);
+ }
+}
+
+static int raid_setup(char *str)
+{
+ int len, pos;
+
+ len = strlen(str) + 1;
+ pos = 0;
+
+ while (pos < len) {
+ char *comma = strchr(str + pos, ',');
+ int wlen;
+ if (comma)
+ wlen = (comma - str) - pos;
+ else
+ wlen = (len - 1) - pos;
+
+ if (!strncmp(str, "noautodetect", wlen))
+ raid_noautodetect = 1;
+ if (strncmp(str, "partitionable", wlen) == 0)
+ raid_autopart = 1;
+ if (strncmp(str, "part", wlen) == 0)
+ raid_autopart = 1;
+ pos += wlen + 1;
+ }
+ return 1;
+}
+
+static void md_run_setup(void)
+{
+ create_dev("/dev/md0", makedev(MD_MAJOR, 0));
+ if (raid_noautodetect)
+ fprintf(stderr,
+ "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
+ else {
+ int fd = open("/dev/md0", 0, 0);
+ if (fd >= 0) {
+ ioctl(fd, RAID_AUTORUN,
+ (void *)(intptr_t) raid_autopart);
+ close(fd);
+ }
+ }
+ md_setup_drive();
+}
+
+void md_run(int argc, char *argv[])
+{
+ char **pp, *p;
+
+ for (pp = argv; (p = *pp); pp++) {
+ if (!strncmp(p, "raid=", 5))
+ raid_setup(p + 5);
+ else if (!strncmp(p, "md=", 3))
+ md_setup(p + 3);
+ }
+
+ md_run_setup();
+}
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