[net-next-2.6.git] / init / do_mounts_md.c

#include <linux/delay.h>
#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.
 */

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