[linux.git] / init / do_mounts_md.c

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