[thirdparty/linux.git] / init / do_mounts_md.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/delay.h>
#include <linux/raid/md_u.h>
#include <linux/raid/md_p.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.
 */

#ifdef CONFIG_MD_AUTODETECT
static int __initdata raid_noautodetect;
#else
static int __initdata raid_noautodetect=1;
#endif
static int __initdata raid_autopart;

static struct {
	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;
		}
		/* 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;
}

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];

		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);
		if (partitioned)
			dev = MKDEV(mdp_major, minor << MdpMinorShift);
		else
			dev = MKDEV(MD_MAJOR, minor);
		create_dev(name, dev);
		for (i = 0; i < MD_SB_DISKS && devname != NULL; 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 = ksys_open(name, 0, 0);
		if (fd < 0) {
			printk(KERN_ERR "md: open failed - cannot start "
					"array %s\n", name);
			continue;
		}
		if (ksys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
			printk(KERN_WARNING
			       "md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
			       minor);
			ksys_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 = ksys_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 = ksys_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);
				ksys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
			}
		}
		if (!err)
			err = ksys_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
			 */
			ksys_close(fd);
			fd = ksys_open(name, 0, 0);
			ksys_ioctl(fd, BLKRRPART, 0);
		}
		ksys_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, "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)
{
	int fd;

	/*
	 * 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();

	fd = ksys_open("/dev/md0", 0, 0);
	if (fd >= 0) {
		ksys_ioctl(fd, RAID_AUTORUN, raid_autopart);
		ksys_close(fd);
	}
}

void __init md_run_setup(void)
{
	create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));

	if (raid_noautodetect)
		printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
	else
		autodetect_raid();
	md_setup_drive();
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
f8b77d39	2	#include <linux/delay.h>
bff61975 N	3	#include <linux/raid/md_u.h>
bff61975 N	4	#include <linux/raid/md_p.h>
1da177e4 LT	5
	6	#include "do_mounts.h"
	7
	8	/*
	9	* When md (and any require personalities) are compiled into the kernel
	10	* (not a module), arrays can be assembles are boot time using with AUTODETECT
	11	* where specially marked partitions are registered with md_autodetect_dev(),
	12	* and with MD_BOOT where devices to be collected are given on the boot line
	13	* with md=.....
	14	* The code for that is here.
	15	*/
	16
a364092a AV	17	#ifdef CONFIG_MD_AUTODETECT
	18	static int __initdata raid_noautodetect;
	19	#else
	20	static int __initdata raid_noautodetect=1;
	21	#endif
	22	static int __initdata raid_autopart;
1da177e4 LT	23
	24	static struct {
	25	int minor;
	26	int partitioned;
2604b703	27	int level;
1da177e4 LT	28	int chunk;
1da177e4 LT	29	char *device_names;
e8703fe1	30	} md_setup_args[256] __initdata;
1da177e4 LT	31
	32	static int md_setup_ents __initdata;
	33
1da177e4 LT	34	/*
	35	* Parse the command-line parameters given our kernel, but do not
	36	* actually try to invoke the MD device now; that is handled by
	37	* md_setup_drive after the low-level disk drivers have initialised.
	38	*
	39	* 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
	40	* assigns the task of parsing integer arguments to the
	41	* invoked program now). Added ability to initialise all
	42	* the MD devices (by specifying multiple "md=" lines)
	43	* instead of just one. -- KTK
	44	* 18May2000: Added support for persistent-superblock arrays:
	45	* md=n,0,factor,fault,device-list uses RAID0 for device n
	46	* md=n,-1,factor,fault,device-list uses LINEAR for device n
	47	* md=n,device-list reads a RAID superblock from the devices
	48	* elements in device-list are read by name_to_kdev_t so can be
	49	* a hex number or something like /dev/hda1 /dev/sdb
	50	* 2001-06-03: Dave Cinege <dcinege@psychosis.com>
	51	* Shifted name_to_kdev_t() and related operations to md_set_drive()
	52	* for later execution. Rewrote section to make devfs compatible.
	53	*/
	54	static int __init md_setup(char *str)
	55	{
2604b703	56	int minor, level, factor, fault, partitioned = 0;
1da177e4 LT	57	char *pername = "";
	58	char *str1;
	59	int ent;
	60
	61	if (*str == 'd') {
	62	partitioned = 1;
	63	str++;
	64	}
	65	if (get_option(&str, &minor) != 2) { /* MD Number */
	66	printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
	67	return 0;
	68	}
	69	str1 = str;
1da177e4 LT	70	for (ent=0 ; ent< md_setup_ents ; ent++)
	71	if (md_setup_args[ent].minor == minor &&
	72	md_setup_args[ent].partitioned == partitioned) {
	73	printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
	74	"Replacing previous definition.\n", partitioned?"d":"", minor);
	75	break;
	76	}
e8703fe1	77	if (ent >= ARRAY_SIZE(md_setup_args)) {
1da177e4 LT	78	printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
	79	return 0;
	80	}
	81	if (ent >= md_setup_ents)
	82	md_setup_ents++;
2604b703	83	switch (get_option(&str, &level)) { /* RAID level */
1da177e4 LT	84	case 2: /* could be 0 or -1.. */
	85	if (level == 0 \|\| level == LEVEL_LINEAR) {
	86	if (get_option(&str, &factor) != 2 \|\| /* Chunk Size */
	87	get_option(&str, &fault) != 2) {
	88	printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
	89	return 0;
	90	}
2604b703	91	md_setup_args[ent].level = level;
1da177e4	92	md_setup_args[ent].chunk = 1 << (factor+12);
2604b703	93	if (level == LEVEL_LINEAR)
1da177e4	94	pername = "linear";
2604b703	95	else
1da177e4	96	pername = "raid0";
1da177e4 LT	97	break;
	98	}
	99	/* FALL THROUGH */
	100	case 1: /* the first device is numeric */
	101	str = str1;
	102	/* FALL THROUGH */
	103	case 0:
2604b703	104	md_setup_args[ent].level = LEVEL_NONE;
1da177e4 LT	105	pername="super-block";
	106	}
	107
	108	printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
	109	minor, pername, str);
	110	md_setup_args[ent].device_names = str;
	111	md_setup_args[ent].partitioned = partitioned;
	112	md_setup_args[ent].minor = minor;
	113
	114	return 1;
	115	}
	116
1da177e4 LT	117	static void __init md_setup_drive(void)
	118	{
	119	int minor, i, ent, partitioned;
	120	dev_t dev;
	121	dev_t devices[MD_SB_DISKS+1];
	122
	123	for (ent = 0; ent < md_setup_ents ; ent++) {
	124	int fd;
	125	int err = 0;
	126	char *devname;
	127	mdu_disk_info_t dinfo;
bdaf8529	128	char name[16];
1da177e4 LT	129
	130	minor = md_setup_args[ent].minor;
	131	partitioned = md_setup_args[ent].partitioned;
	132	devname = md_setup_args[ent].device_names;
	133
	134	sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
1da177e4 LT	135	if (partitioned)
	136	dev = MKDEV(mdp_major, minor << MdpMinorShift);
	137	else
	138	dev = MKDEV(MD_MAJOR, minor);
bdaf8529	139	create_dev(name, dev);
d613c3e2	140	for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
1da177e4 LT	141	char *p;
	142	char comp_name[64];
	143	u32 rdev;
	144
	145	p = strchr(devname, ',');
	146	if (p)
	147	*p++ = 0;
	148
	149	dev = name_to_dev_t(devname);
	150	if (strncmp(devname, "/dev/", 5) == 0)
	151	devname += 5;
	152	snprintf(comp_name, 63, "/dev/%s", devname);
	153	rdev = bstat(comp_name);
	154	if (rdev)
	155	dev = new_decode_dev(rdev);
	156	if (!dev) {
	157	printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
	158	break;
	159	}
	160
	161	devices[i] = dev;
	162
	163	devname = p;
	164	}
	165	devices[i] = 0;
	166
	167	if (!i)
	168	continue;
	169
	170	printk(KERN_INFO "md: Loading md%s%d: %s\n",
	171	partitioned ? "_d" : "", minor,
	172	md_setup_args[ent].device_names);
	173
bae217ea	174	fd = ksys_open(name, 0, 0);
1da177e4 LT	175	if (fd < 0) {
	176	printk(KERN_ERR "md: open failed - cannot start "
	177	"array %s\n", name);
	178	continue;
	179	}
cbb60b92	180	if (ksys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
1da177e4 LT	181	printk(KERN_WARNING
	182	"md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
	183	minor);
2ca2a09d	184	ksys_close(fd);
1da177e4 LT	185	continue;
	186	}
	187
2604b703	188	if (md_setup_args[ent].level != LEVEL_NONE) {
1da177e4 LT	189	/* non-persistent */
1da177e4 LT	190	mdu_array_info_t ainfo;
2604b703	191	ainfo.level = md_setup_args[ent].level;
1da177e4 LT	192	ainfo.size = 0;
	193	ainfo.nr_disks =0;
	194	ainfo.raid_disks =0;
	195	while (devices[ainfo.raid_disks])
	196	ainfo.raid_disks++;
	197	ainfo.md_minor =minor;
	198	ainfo.not_persistent = 1;
	199
	200	ainfo.state = (1 << MD_SB_CLEAN);
	201	ainfo.layout = 0;
	202	ainfo.chunk_size = md_setup_args[ent].chunk;
cbb60b92	203	err = ksys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
1da177e4 LT	204	for (i = 0; !err && i <= MD_SB_DISKS; i++) {
	205	dev = devices[i];
	206	if (!dev)
	207	break;
	208	dinfo.number = i;
	209	dinfo.raid_disk = i;
	210	dinfo.state = (1<<MD_DISK_ACTIVE)\|(1<<MD_DISK_SYNC);
	211	dinfo.major = MAJOR(dev);
	212	dinfo.minor = MINOR(dev);
cbb60b92 DB	213	err = ksys_ioctl(fd, ADD_NEW_DISK,
cbb60b92 DB	214	(long)&dinfo);
1da177e4 LT	215	}
	216	} else {
	217	/* persistent */
	218	for (i = 0; i <= MD_SB_DISKS; i++) {
	219	dev = devices[i];
	220	if (!dev)
	221	break;
	222	dinfo.major = MAJOR(dev);
	223	dinfo.minor = MINOR(dev);
cbb60b92	224	ksys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
1da177e4 LT	225	}
	226	}
	227	if (!err)
cbb60b92	228	err = ksys_ioctl(fd, RUN_ARRAY, 0);
1da177e4 LT	229	if (err)
	230	printk(KERN_WARNING "md: starting md%d failed\n", minor);
	231	else {
	232	/* reread the partition table.
	233	* I (neilb) and not sure why this is needed, but I cannot
	234	* boot a kernel with devfs compiled in from partitioned md
	235	* array without it
	236	*/
2ca2a09d	237	ksys_close(fd);
bae217ea	238	fd = ksys_open(name, 0, 0);
cbb60b92	239	ksys_ioctl(fd, BLKRRPART, 0);
1da177e4	240	}
2ca2a09d	241	ksys_close(fd);
1da177e4 LT	242	}
	243	}
	244
	245	static int __init raid_setup(char *str)
	246	{
	247	int len, pos;
	248
	249	len = strlen(str) + 1;
	250	pos = 0;
	251
	252	while (pos < len) {
	253	char *comma = strchr(str+pos, ',');
	254	int wlen;
	255	if (comma)
	256	wlen = (comma-str)-pos;
	257	else wlen = (len-1)-pos;
	258
	259	if (!strncmp(str, "noautodetect", wlen))
	260	raid_noautodetect = 1;
a364092a AV	261	if (!strncmp(str, "autodetect", wlen))
a364092a AV	262	raid_noautodetect = 0;
1da177e4 LT	263	if (strncmp(str, "partitionable", wlen)==0)
	264	raid_autopart = 1;
	265	if (strncmp(str, "part", wlen)==0)
	266	raid_autopart = 1;
	267	pos += wlen+1;
	268	}
	269	return 1;
	270	}
	271
	272	__setup("raid=", raid_setup);
	273	__setup("md=", md_setup);
	274
ff083c83	275	static void __init autodetect_raid(void)
82cbc11a IM	276	{
	277	int fd;
	278
	279	/*
	280	* Since we don't want to detect and use half a raid array, we need to
	281	* wait for the known devices to complete their probing
	282	*/
	283	printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
	284	printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
216773a7 AV	285
	286	wait_for_device_probe();
	287
bae217ea	288	fd = ksys_open("/dev/md0", 0, 0);
82cbc11a	289	if (fd >= 0) {
cbb60b92	290	ksys_ioctl(fd, RAID_AUTORUN, raid_autopart);
2ca2a09d	291	ksys_close(fd);
82cbc11a IM	292	}
	293	}
	294
1da177e4 LT	295	void __init md_run_setup(void)
1da177e4 LT	296	{
bdaf8529	297	create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
589f800b	298
1da177e4	299	if (raid_noautodetect)
a364092a	300	printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
82cbc11a IM	301	else
82cbc11a IM	302	autodetect_raid();
1da177e4 LT	303	md_setup_drive();
1da177e4 LT	304	}