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- // SPDX-License-Identifier: GPL-2.0
- #include <linux/kernel.h>
- #include <linux/blkdev.h>
- #include <linux/init.h>
- #include <linux/mount.h>
- #include <linux/major.h>
- #include <linux/delay.h>
- #include <linux/init_syscalls.h>
- #include <linux/raid/detect.h>
- #include <linux/raid/md_u.h>
- #include <linux/raid/md_p.h>
- #include "md.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.
- */
- #ifdef CONFIG_MD_AUTODETECT
- static int __initdata raid_noautodetect;
- #else
- static int __initdata raid_noautodetect=1;
- #endif
- static int __initdata raid_autopart;
- static struct md_setup_args {
- int minor;
- int partitioned;
- int level;
- int chunk;
- char *device_names;
- } md_setup_args[256] __initdata;
- static int md_setup_ents __initdata;
- /*
- * 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 <[email protected]>
- * 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;
- 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 >= ARRAY_SIZE(md_setup_args)) {
- 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;
- }
- fallthrough;
- case 1: /* the first device is numeric */
- str = str1;
- fallthrough;
- 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;
- }
- static void __init md_setup_drive(struct md_setup_args *args)
- {
- char *devname = args->device_names;
- dev_t devices[MD_SB_DISKS + 1], mdev;
- struct mdu_array_info_s ainfo = { };
- struct mddev *mddev;
- int err = 0, i;
- char name[16];
- if (args->partitioned) {
- mdev = MKDEV(mdp_major, args->minor << MdpMinorShift);
- sprintf(name, "md_d%d", args->minor);
- } else {
- mdev = MKDEV(MD_MAJOR, args->minor);
- sprintf(name, "md%d", args->minor);
- }
- for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
- struct kstat stat;
- char *p;
- char comp_name[64];
- dev_t dev;
- 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);
- if (init_stat(comp_name, &stat, 0) == 0 && S_ISBLK(stat.mode))
- dev = new_decode_dev(stat.rdev);
- if (!dev) {
- pr_warn("md: Unknown device name: %s\n", devname);
- break;
- }
- devices[i] = dev;
- devname = p;
- }
- devices[i] = 0;
- if (!i)
- return;
- pr_info("md: Loading %s: %s\n", name, args->device_names);
- mddev = md_alloc(mdev, name);
- if (IS_ERR(mddev)) {
- pr_err("md: md_alloc failed - cannot start array %s\n", name);
- return;
- }
- err = mddev_lock(mddev);
- if (err) {
- pr_err("md: failed to lock array %s\n", name);
- goto out_mddev_put;
- }
- if (!list_empty(&mddev->disks) || mddev->raid_disks) {
- pr_warn("md: Ignoring %s, already autodetected. (Use raid=noautodetect)\n",
- name);
- goto out_unlock;
- }
- if (args->level != LEVEL_NONE) {
- /* non-persistent */
- ainfo.level = args->level;
- ainfo.md_minor = args->minor;
- ainfo.not_persistent = 1;
- ainfo.state = (1 << MD_SB_CLEAN);
- ainfo.chunk_size = args->chunk;
- while (devices[ainfo.raid_disks])
- ainfo.raid_disks++;
- }
- err = md_set_array_info(mddev, &ainfo);
- for (i = 0; i <= MD_SB_DISKS && devices[i]; i++) {
- struct mdu_disk_info_s dinfo = {
- .major = MAJOR(devices[i]),
- .minor = MINOR(devices[i]),
- };
- if (args->level != LEVEL_NONE) {
- dinfo.number = i;
- dinfo.raid_disk = i;
- dinfo.state =
- (1 << MD_DISK_ACTIVE) | (1 << MD_DISK_SYNC);
- }
- md_add_new_disk(mddev, &dinfo);
- }
- if (!err)
- err = do_md_run(mddev);
- if (err)
- pr_warn("md: starting %s failed\n", name);
- out_unlock:
- mddev_unlock(mddev);
- out_mddev_put:
- mddev_put(mddev);
- }
- 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, "autodetect", wlen))
- raid_noautodetect = 0;
- 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);
- static void __init autodetect_raid(void)
- {
- /*
- * Since we don't want to detect and use half a raid array, we need to
- * wait for the known devices to complete their probing
- */
- printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
- printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
- wait_for_device_probe();
- md_autostart_arrays(raid_autopart);
- }
- void __init md_run_setup(void)
- {
- int ent;
- if (raid_noautodetect)
- printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
- else
- autodetect_raid();
- for (ent = 0; ent < md_setup_ents; ent++)
- md_setup_drive(&md_setup_args[ent]);
- }
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