304 lines
7.9 KiB
C
304 lines
7.9 KiB
C
#include <linux/delay.h>
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#include <linux/raid/md.h>
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#include "do_mounts.h"
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/*
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* When md (and any require personalities) are compiled into the kernel
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* (not a module), arrays can be assembles are boot time using with AUTODETECT
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* where specially marked partitions are registered with md_autodetect_dev(),
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* and with MD_BOOT where devices to be collected are given on the boot line
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* with md=.....
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* The code for that is here.
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*/
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#ifdef CONFIG_MD_AUTODETECT
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static int __initdata raid_noautodetect;
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#else
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static int __initdata raid_noautodetect=1;
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#endif
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static int __initdata raid_autopart;
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static struct {
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int minor;
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int partitioned;
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int level;
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int chunk;
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char *device_names;
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} md_setup_args[256] __initdata;
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static int md_setup_ents __initdata;
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/*
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* Parse the command-line parameters given our kernel, but do not
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* actually try to invoke the MD device now; that is handled by
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* md_setup_drive after the low-level disk drivers have initialised.
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*
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* 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
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* assigns the task of parsing integer arguments to the
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* invoked program now). Added ability to initialise all
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* the MD devices (by specifying multiple "md=" lines)
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* instead of just one. -- KTK
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* 18May2000: Added support for persistent-superblock arrays:
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* md=n,0,factor,fault,device-list uses RAID0 for device n
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* md=n,-1,factor,fault,device-list uses LINEAR for device n
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* md=n,device-list reads a RAID superblock from the devices
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* elements in device-list are read by name_to_kdev_t so can be
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* a hex number or something like /dev/hda1 /dev/sdb
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* 2001-06-03: Dave Cinege <dcinege@psychosis.com>
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* Shifted name_to_kdev_t() and related operations to md_set_drive()
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* for later execution. Rewrote section to make devfs compatible.
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*/
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static int __init md_setup(char *str)
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{
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int minor, level, factor, fault, partitioned = 0;
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char *pername = "";
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char *str1;
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int ent;
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if (*str == 'd') {
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partitioned = 1;
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str++;
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}
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if (get_option(&str, &minor) != 2) { /* MD Number */
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printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
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return 0;
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}
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str1 = str;
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for (ent=0 ; ent< md_setup_ents ; ent++)
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if (md_setup_args[ent].minor == minor &&
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md_setup_args[ent].partitioned == partitioned) {
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printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
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"Replacing previous definition.\n", partitioned?"d":"", minor);
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break;
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}
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if (ent >= ARRAY_SIZE(md_setup_args)) {
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printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
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return 0;
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}
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if (ent >= md_setup_ents)
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md_setup_ents++;
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switch (get_option(&str, &level)) { /* RAID level */
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case 2: /* could be 0 or -1.. */
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if (level == 0 || level == LEVEL_LINEAR) {
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if (get_option(&str, &factor) != 2 || /* Chunk Size */
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get_option(&str, &fault) != 2) {
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printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
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return 0;
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}
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md_setup_args[ent].level = level;
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md_setup_args[ent].chunk = 1 << (factor+12);
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if (level == LEVEL_LINEAR)
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pername = "linear";
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else
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pername = "raid0";
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break;
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}
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/* FALL THROUGH */
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case 1: /* the first device is numeric */
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str = str1;
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/* FALL THROUGH */
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case 0:
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md_setup_args[ent].level = LEVEL_NONE;
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pername="super-block";
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}
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printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
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minor, pername, str);
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md_setup_args[ent].device_names = str;
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md_setup_args[ent].partitioned = partitioned;
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md_setup_args[ent].minor = minor;
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return 1;
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}
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#define MdpMinorShift 6
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static void __init md_setup_drive(void)
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{
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int minor, i, ent, partitioned;
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dev_t dev;
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dev_t devices[MD_SB_DISKS+1];
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for (ent = 0; ent < md_setup_ents ; ent++) {
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int fd;
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int err = 0;
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char *devname;
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mdu_disk_info_t dinfo;
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char name[16];
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minor = md_setup_args[ent].minor;
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partitioned = md_setup_args[ent].partitioned;
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devname = md_setup_args[ent].device_names;
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sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
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if (partitioned)
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dev = MKDEV(mdp_major, minor << MdpMinorShift);
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else
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dev = MKDEV(MD_MAJOR, minor);
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create_dev(name, dev);
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for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
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char *p;
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char comp_name[64];
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u32 rdev;
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p = strchr(devname, ',');
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if (p)
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*p++ = 0;
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dev = name_to_dev_t(devname);
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if (strncmp(devname, "/dev/", 5) == 0)
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devname += 5;
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snprintf(comp_name, 63, "/dev/%s", devname);
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rdev = bstat(comp_name);
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if (rdev)
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dev = new_decode_dev(rdev);
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if (!dev) {
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printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
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break;
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}
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devices[i] = dev;
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devname = p;
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}
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devices[i] = 0;
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if (!i)
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continue;
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printk(KERN_INFO "md: Loading md%s%d: %s\n",
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partitioned ? "_d" : "", minor,
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md_setup_args[ent].device_names);
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fd = sys_open(name, 0, 0);
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if (fd < 0) {
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printk(KERN_ERR "md: open failed - cannot start "
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"array %s\n", name);
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continue;
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}
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if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
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printk(KERN_WARNING
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"md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
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minor);
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sys_close(fd);
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continue;
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}
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if (md_setup_args[ent].level != LEVEL_NONE) {
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/* non-persistent */
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mdu_array_info_t ainfo;
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ainfo.level = md_setup_args[ent].level;
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ainfo.size = 0;
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ainfo.nr_disks =0;
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ainfo.raid_disks =0;
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while (devices[ainfo.raid_disks])
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ainfo.raid_disks++;
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ainfo.md_minor =minor;
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ainfo.not_persistent = 1;
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ainfo.state = (1 << MD_SB_CLEAN);
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ainfo.layout = 0;
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ainfo.chunk_size = md_setup_args[ent].chunk;
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err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
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for (i = 0; !err && i <= MD_SB_DISKS; i++) {
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dev = devices[i];
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if (!dev)
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break;
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dinfo.number = i;
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dinfo.raid_disk = i;
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dinfo.state = (1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC);
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dinfo.major = MAJOR(dev);
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dinfo.minor = MINOR(dev);
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err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
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}
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} else {
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/* persistent */
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for (i = 0; i <= MD_SB_DISKS; i++) {
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dev = devices[i];
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if (!dev)
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break;
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dinfo.major = MAJOR(dev);
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dinfo.minor = MINOR(dev);
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sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
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}
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}
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if (!err)
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err = sys_ioctl(fd, RUN_ARRAY, 0);
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if (err)
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printk(KERN_WARNING "md: starting md%d failed\n", minor);
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else {
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/* reread the partition table.
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* I (neilb) and not sure why this is needed, but I cannot
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* boot a kernel with devfs compiled in from partitioned md
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* array without it
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*/
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sys_close(fd);
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fd = sys_open(name, 0, 0);
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sys_ioctl(fd, BLKRRPART, 0);
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}
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sys_close(fd);
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}
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}
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static int __init raid_setup(char *str)
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{
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int len, pos;
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len = strlen(str) + 1;
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pos = 0;
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while (pos < len) {
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char *comma = strchr(str+pos, ',');
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int wlen;
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if (comma)
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wlen = (comma-str)-pos;
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else wlen = (len-1)-pos;
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if (!strncmp(str, "noautodetect", wlen))
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raid_noautodetect = 1;
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if (!strncmp(str, "autodetect", wlen))
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raid_noautodetect = 0;
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if (strncmp(str, "partitionable", wlen)==0)
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raid_autopart = 1;
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if (strncmp(str, "part", wlen)==0)
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raid_autopart = 1;
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pos += wlen+1;
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}
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return 1;
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}
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__setup("raid=", raid_setup);
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__setup("md=", md_setup);
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static void __init autodetect_raid(void)
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{
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int fd;
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/*
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* Since we don't want to detect and use half a raid array, we need to
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* wait for the known devices to complete their probing
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*/
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printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
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printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
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wait_for_device_probe();
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fd = sys_open("/dev/md0", 0, 0);
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if (fd >= 0) {
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sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
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sys_close(fd);
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}
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}
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void __init md_run_setup(void)
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{
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create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
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if (raid_noautodetect)
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printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
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else
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autodetect_raid();
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md_setup_drive();
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}
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