[linux-block.git] / drivers / md / md-autodetect.c

// 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 <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;
	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]);
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
4f5b246b CH	2	#include <linux/kernel.h>
	3	#include <linux/blkdev.h>
	4	#include <linux/init.h>
4f5b246b CH	5	#include <linux/mount.h>
4f5b246b CH	6	#include <linux/major.h>
f8b77d39	7	#include <linux/delay.h>
716308a5	8	#include <linux/init_syscalls.h>
4f5b246b	9	#include <linux/raid/detect.h>
bff61975 N	10	#include <linux/raid/md_u.h>
bff61975 N	11	#include <linux/raid/md_p.h>
d82fa81c	12	#include "md.h"
1da177e4	13
1da177e4 LT	14	/*
	15	* When md (and any require personalities) are compiled into the kernel
	16	* (not a module), arrays can be assembles are boot time using with AUTODETECT
	17	* where specially marked partitions are registered with md_autodetect_dev(),
	18	* and with MD_BOOT where devices to be collected are given on the boot line
	19	* with md=.....
	20	* The code for that is here.
	21	*/
	22
a364092a AV	23	#ifdef CONFIG_MD_AUTODETECT
	24	static int __initdata raid_noautodetect;
	25	#else
	26	static int __initdata raid_noautodetect=1;
	27	#endif
	28	static int __initdata raid_autopart;
1da177e4	29
d1100488	30	static struct md_setup_args {
1da177e4 LT	31	int minor;
1da177e4 LT	32	int partitioned;
2604b703	33	int level;
1da177e4 LT	34	int chunk;
1da177e4 LT	35	char *device_names;
e8703fe1	36	} md_setup_args[256] __initdata;
1da177e4 LT	37
	38	static int md_setup_ents __initdata;
	39
1da177e4 LT	40	/*
	41	* Parse the command-line parameters given our kernel, but do not
	42	* actually try to invoke the MD device now; that is handled by
	43	* md_setup_drive after the low-level disk drivers have initialised.
	44	*
	45	* 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
	46	* assigns the task of parsing integer arguments to the
	47	* invoked program now). Added ability to initialise all
	48	* the MD devices (by specifying multiple "md=" lines)
	49	* instead of just one. -- KTK
	50	* 18May2000: Added support for persistent-superblock arrays:
	51	* md=n,0,factor,fault,device-list uses RAID0 for device n
	52	* md=n,-1,factor,fault,device-list uses LINEAR for device n
	53	* md=n,device-list reads a RAID superblock from the devices
	54	* elements in device-list are read by name_to_kdev_t so can be
	55	* a hex number or something like /dev/hda1 /dev/sdb
	56	* 2001-06-03: Dave Cinege <dcinege@psychosis.com>
	57	* Shifted name_to_kdev_t() and related operations to md_set_drive()
	58	* for later execution. Rewrote section to make devfs compatible.
	59	*/
	60	static int __init md_setup(char *str)
	61	{
2604b703	62	int minor, level, factor, fault, partitioned = 0;
1da177e4 LT	63	char *pername = "";
	64	char *str1;
	65	int ent;
	66
	67	if (*str == 'd') {
	68	partitioned = 1;
	69	str++;
	70	}
	71	if (get_option(&str, &minor) != 2) { /* MD Number */
	72	printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
	73	return 0;
	74	}
	75	str1 = str;
1da177e4 LT	76	for (ent=0 ; ent< md_setup_ents ; ent++)
	77	if (md_setup_args[ent].minor == minor &&
	78	md_setup_args[ent].partitioned == partitioned) {
	79	printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
	80	"Replacing previous definition.\n", partitioned?"d":"", minor);
	81	break;
	82	}
e8703fe1	83	if (ent >= ARRAY_SIZE(md_setup_args)) {
1da177e4 LT	84	printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
	85	return 0;
	86	}
	87	if (ent >= md_setup_ents)
	88	md_setup_ents++;
2604b703	89	switch (get_option(&str, &level)) { /* RAID level */
1da177e4 LT	90	case 2: /* could be 0 or -1.. */
	91	if (level == 0 \|\| level == LEVEL_LINEAR) {
	92	if (get_option(&str, &factor) != 2 \|\| /* Chunk Size */
	93	get_option(&str, &fault) != 2) {
	94	printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
	95	return 0;
	96	}
2604b703	97	md_setup_args[ent].level = level;
1da177e4	98	md_setup_args[ent].chunk = 1 << (factor+12);
2604b703	99	if (level == LEVEL_LINEAR)
1da177e4	100	pername = "linear";
2604b703	101	else
1da177e4	102	pername = "raid0";
1da177e4 LT	103	break;
1da177e4 LT	104	}
df561f66	105	fallthrough;
1da177e4 LT	106	case 1: /* the first device is numeric */
1da177e4 LT	107	str = str1;
df561f66	108	fallthrough;
1da177e4	109	case 0:
2604b703	110	md_setup_args[ent].level = LEVEL_NONE;
1da177e4 LT	111	pername="super-block";
	112	}
	113
	114	printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
	115	minor, pername, str);
	116	md_setup_args[ent].device_names = str;
	117	md_setup_args[ent].partitioned = partitioned;
	118	md_setup_args[ent].minor = minor;
	119
	120	return 1;
	121	}
	122
d1100488	123	static void __init md_setup_drive(struct md_setup_args *args)
1da177e4	124	{
7e0adbfc CH	125	char *devname = args->device_names;
	126	dev_t devices[MD_SB_DISKS + 1], mdev;
	127	struct mdu_array_info_s ainfo = { };
7e0adbfc CH	128	struct mddev *mddev;
7e0adbfc CH	129	int err = 0, i;
d1100488	130	char name[16];
1da177e4	131
7e0adbfc CH	132	if (args->partitioned) {
	133	mdev = MKDEV(mdp_major, args->minor << MdpMinorShift);
	134	sprintf(name, "md_d%d", args->minor);
	135	} else {
	136	mdev = MKDEV(MD_MAJOR, args->minor);
	137	sprintf(name, "md%d", args->minor);
	138	}
1da177e4	139
d1100488 CH	140	for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
	141	struct kstat stat;
	142	char *p;
	143	char comp_name[64];
7e0adbfc	144	dev_t dev;
1da177e4	145
d1100488 CH	146	p = strchr(devname, ',');
	147	if (p)
	148	*p++ = 0;
1da177e4	149
d1100488 CH	150	dev = name_to_dev_t(devname);
	151	if (strncmp(devname, "/dev/", 5) == 0)
	152	devname += 5;
	153	snprintf(comp_name, 63, "/dev/%s", devname);
716308a5	154	if (init_stat(comp_name, &stat, 0) == 0 && S_ISBLK(stat.mode))
d1100488 CH	155	dev = new_decode_dev(stat.rdev);
d1100488 CH	156	if (!dev) {
7e0adbfc	157	pr_warn("md: Unknown device name: %s\n", devname);
d1100488 CH	158	break;
d1100488 CH	159	}
1da177e4	160
d1100488 CH	161	devices[i] = dev;
	162	devname = p;
	163	}
	164	devices[i] = 0;
1da177e4	165
d1100488 CH	166	if (!i)
d1100488 CH	167	return;
1da177e4	168
7e0adbfc	169	pr_info("md: Loading %s: %s\n", name, args->device_names);
1da177e4	170
34cb92c0 CH	171	mddev = md_alloc(mdev, name);
	172	if (IS_ERR(mddev)) {
	173	pr_err("md: md_alloc failed - cannot start array %s\n", name);
d1100488 CH	174	return;
d1100488 CH	175	}
7e0adbfc	176
7e0adbfc CH	177	err = mddev_lock(mddev);
	178	if (err) {
	179	pr_err("md: failed to lock array %s\n", name);
34cb92c0	180	goto out_mddev_put;
7e0adbfc CH	181	}
	182
	183	if (!list_empty(&mddev->disks) \|\| mddev->raid_disks) {
	184	pr_warn("md: Ignoring %s, already autodetected. (Use raid=noautodetect)\n",
	185	name);
	186	goto out_unlock;
d1100488	187	}
1da177e4	188
d1100488 CH	189	if (args->level != LEVEL_NONE) {
d1100488 CH	190	/* non-persistent */
d1100488	191	ainfo.level = args->level;
7e0adbfc	192	ainfo.md_minor = args->minor;
d1100488	193	ainfo.not_persistent = 1;
d1100488	194	ainfo.state = (1 << MD_SB_CLEAN);
d1100488	195	ainfo.chunk_size = args->chunk;
7e0adbfc CH	196	while (devices[ainfo.raid_disks])
	197	ainfo.raid_disks++;
	198	}
	199
	200	err = md_set_array_info(mddev, &ainfo);
	201
	202	for (i = 0; i <= MD_SB_DISKS && devices[i]; i++) {
	203	struct mdu_disk_info_s dinfo = {
	204	.major = MAJOR(devices[i]),
	205	.minor = MINOR(devices[i]),
	206	};
	207
	208	if (args->level != LEVEL_NONE) {
d1100488 CH	209	dinfo.number = i;
d1100488 CH	210	dinfo.raid_disk = i;
7e0adbfc CH	211	dinfo.state =
7e0adbfc CH	212	(1 << MD_DISK_ACTIVE) \| (1 << MD_DISK_SYNC);
1da177e4	213	}
7e0adbfc CH	214
7e0adbfc CH	215	md_add_new_disk(mddev, &dinfo);
1da177e4	216	}
7e0adbfc	217
d1100488	218	if (!err)
7e0adbfc	219	err = do_md_run(mddev);
d1100488	220	if (err)
7e0adbfc CH	221	pr_warn("md: starting %s failed\n", name);
	222	out_unlock:
	223	mddev_unlock(mddev);
34cb92c0 CH	224	out_mddev_put:
34cb92c0 CH	225	mddev_put(mddev);
1da177e4 LT	226	}
	227
	228	static int __init raid_setup(char *str)
	229	{
	230	int len, pos;
	231
	232	len = strlen(str) + 1;
	233	pos = 0;
	234
	235	while (pos < len) {
	236	char *comma = strchr(str+pos, ',');
	237	int wlen;
	238	if (comma)
	239	wlen = (comma-str)-pos;
	240	else wlen = (len-1)-pos;
	241
	242	if (!strncmp(str, "noautodetect", wlen))
	243	raid_noautodetect = 1;
a364092a AV	244	if (!strncmp(str, "autodetect", wlen))
a364092a AV	245	raid_noautodetect = 0;
1da177e4 LT	246	if (strncmp(str, "partitionable", wlen)==0)
	247	raid_autopart = 1;
	248	if (strncmp(str, "part", wlen)==0)
	249	raid_autopart = 1;
	250	pos += wlen+1;
	251	}
	252	return 1;
	253	}
	254
	255	__setup("raid=", raid_setup);
	256	__setup("md=", md_setup);
	257
ff083c83	258	static void __init autodetect_raid(void)
82cbc11a	259	{
82cbc11a IM	260	/*
	261	* Since we don't want to detect and use half a raid array, we need to
	262	* wait for the known devices to complete their probing
	263	*/
	264	printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
	265	printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
216773a7 AV	266
216773a7 AV	267	wait_for_device_probe();
d82fa81c	268	md_autostart_arrays(raid_autopart);
82cbc11a IM	269	}
82cbc11a IM	270
1da177e4 LT	271	void __init md_run_setup(void)
1da177e4 LT	272	{
d1100488 CH	273	int ent;
d1100488 CH	274
1da177e4	275	if (raid_noautodetect)
a364092a	276	printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
82cbc11a IM	277	else
82cbc11a IM	278	autodetect_raid();
d1100488 CH	279
	280	for (ent = 0; ent < md_setup_ents; ent++)
	281	md_setup_drive(&md_setup_args[ent]);
1da177e4	282	}