[mirror_ubuntu-bionic-kernel.git] / init / do_mounts_md.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Many of the syscalls used in this file expect some of the arguments
 * to be __user pointers not __kernel pointers.  To limit the sparse
 * noise, turn off sparse checking for this file.
 */
#ifdef __CHECKER__
#undef __CHECKER__
#warning "Sparse checking disabled for this file"
#endif

#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 = 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, "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 = sys_open("/dev/md0", 0, 0);
	if (fd >= 0) {
		sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
		sys_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
c67e5382 HS	2	/*
	3	* Many of the syscalls used in this file expect some of the arguments
	4	* to be __user pointers not __kernel pointers. To limit the sparse
	5	* noise, turn off sparse checking for this file.
	6	*/
	7	#ifdef __CHECKER__
	8	#undef __CHECKER__
	9	#warning "Sparse checking disabled for this file"
	10	#endif
	11
f8b77d39	12	#include <linux/delay.h>
bff61975 N	13	#include <linux/raid/md_u.h>
bff61975 N	14	#include <linux/raid/md_p.h>
1da177e4 LT	15
	16	#include "do_mounts.h"
	17
	18	/*
	19	* When md (and any require personalities) are compiled into the kernel
	20	* (not a module), arrays can be assembles are boot time using with AUTODETECT
	21	* where specially marked partitions are registered with md_autodetect_dev(),
	22	* and with MD_BOOT where devices to be collected are given on the boot line
	23	* with md=.....
	24	* The code for that is here.
	25	*/
	26
a364092a AV	27	#ifdef CONFIG_MD_AUTODETECT
	28	static int __initdata raid_noautodetect;
	29	#else
	30	static int __initdata raid_noautodetect=1;
	31	#endif
	32	static int __initdata raid_autopart;
1da177e4 LT	33
	34	static struct {
	35	int minor;
	36	int partitioned;
2604b703	37	int level;
1da177e4 LT	38	int chunk;
1da177e4 LT	39	char *device_names;
e8703fe1	40	} md_setup_args[256] __initdata;
1da177e4 LT	41
	42	static int md_setup_ents __initdata;
	43
1da177e4 LT	44	/*
	45	* Parse the command-line parameters given our kernel, but do not
	46	* actually try to invoke the MD device now; that is handled by
	47	* md_setup_drive after the low-level disk drivers have initialised.
	48	*
	49	* 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
	50	* assigns the task of parsing integer arguments to the
	51	* invoked program now). Added ability to initialise all
	52	* the MD devices (by specifying multiple "md=" lines)
	53	* instead of just one. -- KTK
	54	* 18May2000: Added support for persistent-superblock arrays:
	55	* md=n,0,factor,fault,device-list uses RAID0 for device n
	56	* md=n,-1,factor,fault,device-list uses LINEAR for device n
	57	* md=n,device-list reads a RAID superblock from the devices
	58	* elements in device-list are read by name_to_kdev_t so can be
	59	* a hex number or something like /dev/hda1 /dev/sdb
	60	* 2001-06-03: Dave Cinege <dcinege@psychosis.com>
	61	* Shifted name_to_kdev_t() and related operations to md_set_drive()
	62	* for later execution. Rewrote section to make devfs compatible.
	63	*/
	64	static int __init md_setup(char *str)
	65	{
2604b703	66	int minor, level, factor, fault, partitioned = 0;
1da177e4 LT	67	char *pername = "";
	68	char *str1;
	69	int ent;
	70
	71	if (*str == 'd') {
	72	partitioned = 1;
	73	str++;
	74	}
	75	if (get_option(&str, &minor) != 2) { /* MD Number */
	76	printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
	77	return 0;
	78	}
	79	str1 = str;
1da177e4 LT	80	for (ent=0 ; ent< md_setup_ents ; ent++)
	81	if (md_setup_args[ent].minor == minor &&
	82	md_setup_args[ent].partitioned == partitioned) {
	83	printk(KERN_WARNING "md: md=%s%d, Specified more than once. "
	84	"Replacing previous definition.\n", partitioned?"d":"", minor);
	85	break;
	86	}
e8703fe1	87	if (ent >= ARRAY_SIZE(md_setup_args)) {
1da177e4 LT	88	printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
	89	return 0;
	90	}
	91	if (ent >= md_setup_ents)
	92	md_setup_ents++;
2604b703	93	switch (get_option(&str, &level)) { /* RAID level */
1da177e4 LT	94	case 2: /* could be 0 or -1.. */
	95	if (level == 0 \|\| level == LEVEL_LINEAR) {
	96	if (get_option(&str, &factor) != 2 \|\| /* Chunk Size */
	97	get_option(&str, &fault) != 2) {
	98	printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
	99	return 0;
	100	}
2604b703	101	md_setup_args[ent].level = level;
1da177e4	102	md_setup_args[ent].chunk = 1 << (factor+12);
2604b703	103	if (level == LEVEL_LINEAR)
1da177e4	104	pername = "linear";
2604b703	105	else
1da177e4	106	pername = "raid0";
1da177e4 LT	107	break;
	108	}
	109	/* FALL THROUGH */
	110	case 1: /* the first device is numeric */
	111	str = str1;
	112	/* FALL THROUGH */
	113	case 0:
2604b703	114	md_setup_args[ent].level = LEVEL_NONE;
1da177e4 LT	115	pername="super-block";
	116	}
	117
	118	printk(KERN_INFO "md: Will configure md%d (%s) from %s, below.\n",
	119	minor, pername, str);
	120	md_setup_args[ent].device_names = str;
	121	md_setup_args[ent].partitioned = partitioned;
	122	md_setup_args[ent].minor = minor;
	123
	124	return 1;
	125	}
	126
1da177e4 LT	127	static void __init md_setup_drive(void)
	128	{
	129	int minor, i, ent, partitioned;
	130	dev_t dev;
	131	dev_t devices[MD_SB_DISKS+1];
	132
	133	for (ent = 0; ent < md_setup_ents ; ent++) {
	134	int fd;
	135	int err = 0;
	136	char *devname;
	137	mdu_disk_info_t dinfo;
bdaf8529	138	char name[16];
1da177e4 LT	139
	140	minor = md_setup_args[ent].minor;
	141	partitioned = md_setup_args[ent].partitioned;
	142	devname = md_setup_args[ent].device_names;
	143
	144	sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
1da177e4 LT	145	if (partitioned)
	146	dev = MKDEV(mdp_major, minor << MdpMinorShift);
	147	else
	148	dev = MKDEV(MD_MAJOR, minor);
bdaf8529	149	create_dev(name, dev);
d613c3e2	150	for (i = 0; i < MD_SB_DISKS && devname != NULL; i++) {
1da177e4 LT	151	char *p;
	152	char comp_name[64];
	153	u32 rdev;
	154
	155	p = strchr(devname, ',');
	156	if (p)
	157	*p++ = 0;
	158
	159	dev = name_to_dev_t(devname);
	160	if (strncmp(devname, "/dev/", 5) == 0)
	161	devname += 5;
	162	snprintf(comp_name, 63, "/dev/%s", devname);
	163	rdev = bstat(comp_name);
	164	if (rdev)
	165	dev = new_decode_dev(rdev);
	166	if (!dev) {
	167	printk(KERN_WARNING "md: Unknown device name: %s\n", devname);
	168	break;
	169	}
	170
	171	devices[i] = dev;
	172
	173	devname = p;
	174	}
	175	devices[i] = 0;
	176
	177	if (!i)
	178	continue;
	179
	180	printk(KERN_INFO "md: Loading md%s%d: %s\n",
	181	partitioned ? "_d" : "", minor,
	182	md_setup_args[ent].device_names);
	183
	184	fd = sys_open(name, 0, 0);
	185	if (fd < 0) {
	186	printk(KERN_ERR "md: open failed - cannot start "
	187	"array %s\n", name);
	188	continue;
	189	}
	190	if (sys_ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
	191	printk(KERN_WARNING
	192	"md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
	193	minor);
	194	sys_close(fd);
	195	continue;
	196	}
	197
2604b703	198	if (md_setup_args[ent].level != LEVEL_NONE) {
1da177e4 LT	199	/* non-persistent */
1da177e4 LT	200	mdu_array_info_t ainfo;
2604b703	201	ainfo.level = md_setup_args[ent].level;
1da177e4 LT	202	ainfo.size = 0;
	203	ainfo.nr_disks =0;
	204	ainfo.raid_disks =0;
	205	while (devices[ainfo.raid_disks])
	206	ainfo.raid_disks++;
	207	ainfo.md_minor =minor;
	208	ainfo.not_persistent = 1;
	209
	210	ainfo.state = (1 << MD_SB_CLEAN);
	211	ainfo.layout = 0;
	212	ainfo.chunk_size = md_setup_args[ent].chunk;
	213	err = sys_ioctl(fd, SET_ARRAY_INFO, (long)&ainfo);
	214	for (i = 0; !err && i <= MD_SB_DISKS; i++) {
	215	dev = devices[i];
	216	if (!dev)
	217	break;
	218	dinfo.number = i;
	219	dinfo.raid_disk = i;
	220	dinfo.state = (1<<MD_DISK_ACTIVE)\|(1<<MD_DISK_SYNC);
	221	dinfo.major = MAJOR(dev);
	222	dinfo.minor = MINOR(dev);
	223	err = sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
	224	}
	225	} else {
	226	/* persistent */
	227	for (i = 0; i <= MD_SB_DISKS; i++) {
	228	dev = devices[i];
	229	if (!dev)
	230	break;
	231	dinfo.major = MAJOR(dev);
	232	dinfo.minor = MINOR(dev);
	233	sys_ioctl(fd, ADD_NEW_DISK, (long)&dinfo);
	234	}
	235	}
	236	if (!err)
	237	err = sys_ioctl(fd, RUN_ARRAY, 0);
	238	if (err)
	239	printk(KERN_WARNING "md: starting md%d failed\n", minor);
	240	else {
	241	/* reread the partition table.
	242	* I (neilb) and not sure why this is needed, but I cannot
	243	* boot a kernel with devfs compiled in from partitioned md
	244	* array without it
	245	*/
	246	sys_close(fd);
	247	fd = sys_open(name, 0, 0);
	248	sys_ioctl(fd, BLKRRPART, 0);
	249	}
	250	sys_close(fd);
	251	}
	252	}
	253
	254	static int __init raid_setup(char *str)
	255	{
	256	int len, pos;
	257
	258	len = strlen(str) + 1;
	259	pos = 0;
	260
	261	while (pos < len) {
	262	char *comma = strchr(str+pos, ',');
	263	int wlen;
	264	if (comma)
	265	wlen = (comma-str)-pos;
266	else wlen = (len-1)-pos;
267
268	if (!strncmp(str, "noautodetect", wlen))
269	raid_noautodetect = 1;
a364092a AV	270	if (!strncmp(str, "autodetect", wlen))
a364092a AV	271	raid_noautodetect = 0;
1da177e4 LT	272	if (strncmp(str, "partitionable", wlen)==0)
	273	raid_autopart = 1;
	274	if (strncmp(str, "part", wlen)==0)
	275	raid_autopart = 1;
	276	pos += wlen+1;
	277	}
	278	return 1;
	279	}
	280
	281	__setup("raid=", raid_setup);
	282	__setup("md=", md_setup);
	283
ff083c83	284	static void __init autodetect_raid(void)
82cbc11a IM	285	{
	286	int fd;
	287
	288	/*
	289	* Since we don't want to detect and use half a raid array, we need to
	290	* wait for the known devices to complete their probing
	291	*/
	292	printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
	293	printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
216773a7 AV	294
	295	wait_for_device_probe();
	296
c67e5382	297	fd = sys_open("/dev/md0", 0, 0);
82cbc11a IM	298	if (fd >= 0) {
	299	sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
	300	sys_close(fd);
	301	}
	302	}
	303
1da177e4 LT	304	void __init md_run_setup(void)
1da177e4 LT	305	{
bdaf8529	306	create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
589f800b	307
1da177e4	308	if (raid_noautodetect)
a364092a	309	printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
82cbc11a IM	310	else
82cbc11a IM	311	autodetect_raid();
1da177e4 LT	312	md_setup_drive();
1da177e4 LT	313	}