287 lines
7.5 KiB
C
287 lines
7.5 KiB
C
|
|
#include <linux/raid/md.h>
|
|
|
|
#include "do_mounts.h"
|
|
|
|
/*
|
|
* 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 __initdata raid_noautodetect, raid_autopart;
|
|
|
|
static struct {
|
|
int minor;
|
|
int partitioned;
|
|
int level;
|
|
int chunk;
|
|
char *device_names;
|
|
} md_setup_args[MAX_MD_DEVS] __initdata;
|
|
|
|
static int md_setup_ents __initdata;
|
|
|
|
extern int mdp_major;
|
|
/*
|
|
* 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 __init md_setup(char *str)
|
|
{
|
|
int minor, level, factor, fault, partitioned = 0;
|
|
char *pername = "";
|
|
char *str1;
|
|
int ent;
|
|
|
|
if (*str == 'd') {
|
|
partitioned = 1;
|
|
str++;
|
|
}
|
|
if (get_option(&str, &minor) != 2) { /* MD Number */
|
|
printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
|
|
return 0;
|
|
}
|
|
str1 = str;
|
|
if (minor >= MAX_MD_DEVS) {
|
|
printk(KERN_WARNING "md: md=%d, Minor device number too high.\n", minor);
|
|
return 0;
|
|
}
|
|
for (ent=0 ; ent< md_setup_ents ; ent++)
|
|
if (md_setup_args[ent].minor == minor &&
|
|
md_setup_args[ent].partitioned == partitioned) {
|
|
printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
|
|
"Replacing previous definition.\n", partitioned?"d":"", minor);
|
|
break;
|
|
}
|
|
if (ent >= MAX_MD_DEVS) {
|
|
printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
|
|
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) {
|
|
printk(KERN_WARNING "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";
|
|
}
|
|
|
|
printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
|
|
minor, pername, str);
|
|
md_setup_args[ent].device_names = str;
|
|
md_setup_args[ent].partitioned = partitioned;
|
|
md_setup_args[ent].minor = minor;
|
|
|
|
return 1;
|
|
}
|
|
|
|
#define MdpMinorShift 6
|
|
|
|
static void __init md_setup_drive(void)
|
|
{
|
|
int 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], devfs_name[16];
|
|
|
|
minor = md_setup_args[ent].minor;
|
|
partitioned = md_setup_args[ent].partitioned;
|
|
devname = md_setup_args[ent].device_names;
|
|
|
|
sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
|
|
sprintf(devfs_name, "/dev/md/%s%d", partitioned?"d":"", minor);
|
|
if (partitioned)
|
|
dev = MKDEV(mdp_major, minor << MdpMinorShift);
|
|
else
|
|
dev = MKDEV(MD_MAJOR, minor);
|
|
create_dev(name, dev, devfs_name);
|
|
for (i = 0; i < MD_SB_DISKS && devname != 0; i++) {
|
|
char *p;
|
|
char comp_name[64];
|
|
u32 rdev;
|
|
|
|
p = strchr(devname, ',');
|
|
if (p)
|
|
*p++ = 0;
|
|
|
|
dev = name_to_dev_t(devname);
|
|
if (strncmp(devname, "/dev/", 5) == 0)
|
|
devname += 5;
|
|
snprintf(comp_name, 63, "/dev/%s", devname);
|
|
rdev = bstat(comp_name);
|
|
if (rdev)
|
|
dev = new_decode_dev(rdev);
|
|
if (!dev) {
|
|
printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
|
|
break;
|
|
}
|
|
|
|
devices[i] = dev;
|
|
|
|
devname = p;
|
|
}
|
|
devices[i] = 0;
|
|
|
|
if (!i)
|
|
continue;
|
|
|
|
printk(KERN_INFO "md: Loading md%s%d: %s\n",
|
|
partitioned ? "_d" : "", minor,
|
|
md_setup_args[ent].device_names);
|
|
|
|
fd = sys_open(name, 0, 0);
|
|
if (fd < 0) {
|
|
printk(KERN_ERR "md: open failed - cannot start "
|
|
"array %s\n", name);
|
|
continue;
|
|
}
|
|
if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
|
|
printk(KERN_WARNING
|
|
"md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
|
|
minor);
|
|
sys_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 =minor;
|
|
ainfo.not_persistent = 1;
|
|
|
|
ainfo.state = (1 << MD_SB_CLEAN);
|
|
ainfo.layout = 0;
|
|
ainfo.chunk_size = md_setup_args[ent].chunk;
|
|
err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&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 = sys_ioctl(fd, ADD_NEW_DISK, (long)&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);
|
|
sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
|
|
}
|
|
}
|
|
if (!err)
|
|
err = sys_ioctl(fd, RUN_ARRAY, 0);
|
|
if (err)
|
|
printk(KERN_WARNING "md: starting md%d failed\n", 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
|
|
*/
|
|
sys_close(fd);
|
|
fd = sys_open(name, 0, 0);
|
|
sys_ioctl(fd, BLKRRPART, 0);
|
|
}
|
|
sys_close(fd);
|
|
}
|
|
}
|
|
|
|
static int __init 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;
|
|
}
|
|
|
|
__setup("raid=", raid_setup);
|
|
__setup("md=", md_setup);
|
|
|
|
void __init md_run_setup(void)
|
|
{
|
|
create_dev("/dev/md0", MKDEV(MD_MAJOR, 0), "md/0");
|
|
if (raid_noautodetect)
|
|
printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
|
|
else {
|
|
int fd = sys_open("/dev/md0", 0, 0);
|
|
if (fd >= 0) {
|
|
sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
|
|
sys_close(fd);
|
|
}
|
|
}
|
|
md_setup_drive();
|
|
}
|