[GitHub/mt8127/android_kernel_alcatel_ttab.git] / init / do_mounts_md.c

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