[linux.git] / init / do_mounts_md.c


#include <linux/raid/md.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.
 */

static int __initdata raid_noautodetect, 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;

extern int mdp_major;
/*
 * 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;
}

#define MdpMinorShift 6

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 != 0; 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, "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);

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