292 lines
7.6 KiB
C
292 lines
7.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/blkdev.h>
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#include <linux/init.h>
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#include <linux/mount.h>
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#include <linux/major.h>
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#include <linux/delay.h>
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#include <linux/init_syscalls.h>
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#include <linux/raid/detect.h>
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#include <linux/raid/md_u.h>
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#include <linux/raid/md_p.h>
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#include "md.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 md_setup_args {
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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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fallthrough;
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case 1: /* the first device is numeric */
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str = str1;
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fallthrough;
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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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static void __init md_setup_drive(struct md_setup_args *args)
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{
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char *devname = args->device_names;
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dev_t devices[MD_SB_DISKS + 1], mdev;
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struct mdu_array_info_s ainfo = { };
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struct block_device *bdev;
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struct mddev *mddev;
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int err = 0, i;
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char name[16];
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if (args->partitioned) {
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mdev = MKDEV(mdp_major, args->minor << MdpMinorShift);
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sprintf(name, "md_d%d", args->minor);
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} else {
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mdev = MKDEV(MD_MAJOR, args->minor);
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sprintf(name, "md%d", args->minor);
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}
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for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
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struct kstat stat;
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char *p;
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char comp_name[64];
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dev_t dev;
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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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if (init_stat(comp_name, &stat, 0) == 0 && S_ISBLK(stat.mode))
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dev = new_decode_dev(stat.rdev);
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if (!dev) {
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pr_warn("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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return;
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pr_info("md: Loading %s: %s\n", name, args->device_names);
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bdev = blkdev_get_by_dev(mdev, FMODE_READ, NULL);
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if (IS_ERR(bdev)) {
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pr_err("md: open failed - cannot start array %s\n", name);
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return;
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}
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err = -EIO;
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if (WARN(bdev->bd_disk->fops != &md_fops,
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"Opening block device %x resulted in non-md device\n",
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mdev))
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goto out_blkdev_put;
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mddev = bdev->bd_disk->private_data;
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err = mddev_lock(mddev);
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if (err) {
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pr_err("md: failed to lock array %s\n", name);
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goto out_blkdev_put;
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}
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if (!list_empty(&mddev->disks) || mddev->raid_disks) {
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pr_warn("md: Ignoring %s, already autodetected. (Use raid=noautodetect)\n",
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name);
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goto out_unlock;
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}
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if (args->level != LEVEL_NONE) {
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/* non-persistent */
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ainfo.level = args->level;
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ainfo.md_minor = args->minor;
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ainfo.not_persistent = 1;
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ainfo.state = (1 << MD_SB_CLEAN);
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ainfo.chunk_size = args->chunk;
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while (devices[ainfo.raid_disks])
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ainfo.raid_disks++;
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}
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err = md_set_array_info(mddev, &ainfo);
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for (i = 0; i <= MD_SB_DISKS && devices[i]; i++) {
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struct mdu_disk_info_s dinfo = {
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.major = MAJOR(devices[i]),
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.minor = MINOR(devices[i]),
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};
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if (args->level != LEVEL_NONE) {
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dinfo.number = i;
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dinfo.raid_disk = i;
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dinfo.state =
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(1 << MD_DISK_ACTIVE) | (1 << MD_DISK_SYNC);
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}
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md_add_new_disk(mddev, &dinfo);
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}
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if (!err)
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err = do_md_run(mddev);
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if (err)
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pr_warn("md: starting %s failed\n", name);
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out_unlock:
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mddev_unlock(mddev);
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out_blkdev_put:
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blkdev_put(bdev, FMODE_READ);
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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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/*
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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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md_autostart_arrays(raid_autopart);
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}
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void __init md_run_setup(void)
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{
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int ent;
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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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for (ent = 0; ent < md_setup_ents; ent++)
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md_setup_drive(&md_setup_args[ent]);
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}
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