usr/kinit/do_mounts_md.c

/*
 * Handle autoconfiguration of md devices.  This is ugly, partially since
 * it still relies on a sizable kernel component.
 *
 * This file is derived from the Linux kernel.
 */

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <alloca.h>
#include <inttypes.h>
#include <sys/sysmacros.h>
#include <sys/md.h>
#include <linux/major.h>

#include "kinit.h"
#include "do_mounts.h"

#define  LEVEL_NONE              (-1000000)

/*
 * 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 raid_noautodetect, raid_autopart;

static struct {
	int minor;
	int partitioned;
	int level;
	int chunk;
	char *device_names;
} md_setup_args[MAX_MD_DEVS];

static int md_setup_ents;

/**
 *	get_option - Parse integer from an option string
 *	@str: option string
 *	@pint: (output) integer value parsed from @str
 *
 *	Read an int from an option string; if available accept a subsequent
 *	comma as well.
 *
 *	Return values:
 *	0 : no int in string
 *	1 : int found, no subsequent comma
 *	2 : int found including a subsequent comma
 */

static int get_option(char **str, int *pint)
{
	char *cur = *str;

	if (!cur || !(*cur))
		return 0;
	*pint = strtol(cur, str, 0);
	if (cur == *str)
		return 0;
	if (**str == ',') {
		(*str)++;
		return 2;
	}

	return 1;
}

/*
 * Find the partitioned md device major number... of course this *HAD*
 * to be done dynamically instead of using a registered number.
 * Sigh.  Double sigh.
 */
static int mdp_major(void)
{
	static int found = 0;
	FILE *f;
	char line[512], *p;
	int is_blk, major_no;

	if (found)
		return found;

	f = fopen("/proc/devices", "r");
	is_blk = 0;
	while (fgets(line, sizeof line, f)) {
		if (!strcmp(line, "Block devices:\n"))
			is_blk = 1;
		if (is_blk) {
			major_no = strtol(line, &p, 10);
			while (*p && isspace(*p))
				p++;

			if (major_no == 0)	/* Not a number */
				is_blk = 0;
			else if (major_no > 0 && !strcmp(p, "mdp")) {
				found = major_no;
				break;
			}
		}
	}
	fclose(f);

	if (!found) {
		fprintf(stderr,
			"Error: mdp devices detected but no mdp device found!\n");
		exit(1);
	}

	return found;
}

/*
 * 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 md_setup(char *str)
{
	int minor_num, level, factor, fault, partitioned = 0;
	char *pername = "";
	char *str1;
	int ent;

	if (*str == 'd') {
		partitioned = 1;
		str++;
	}
	if (get_option(&str, &minor_num) != 2) {	/* MD Number */
		fprintf(stderr, "md: Too few arguments supplied to md=.\n");
		return 0;
	}
	str1 = str;
	if (minor_num >= MAX_MD_DEVS) {
		fprintf(stderr, "md: md=%d, Minor device number too high.\n",
			minor_num);
		return 0;
	}
	for (ent = 0; ent < md_setup_ents; ent++)
		if (md_setup_args[ent].minor == minor_num &&
		    md_setup_args[ent].partitioned == partitioned) {
			fprintf(stderr,
				"md: md=%s%d, Specified more than once. "
				"Replacing previous definition.\n",
				partitioned ? "d" : "", minor_num);
			break;
		}
	if (ent >= MAX_MD_DEVS) {
		fprintf(stderr, "md: md=%s%d - too many md initialisations\n",
			partitioned ? "d" : "", minor_num);
		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) {
				fprintf(stderr,
					"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";
	}

	fprintf(stderr, "md: Will configure md%s%d (%s) from %s, below.\n",
		partitioned?"_d":"", minor_num, pername, str);
	md_setup_args[ent].device_names = str;
	md_setup_args[ent].partitioned = partitioned;
	md_setup_args[ent].minor = minor_num;

	return 1;
}

#define MdpMinorShift 6

static void md_setup_drive(void)
{
	int dev_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];
		struct stat st_chk;

		dev_minor = md_setup_args[ent].minor;
		partitioned = md_setup_args[ent].partitioned;
		devname = md_setup_args[ent].device_names;

		snprintf(name, sizeof name,
			 "/dev/md%s%d", partitioned ? "_d" : "", dev_minor);

		if (stat(name, &st_chk) == 0)
			continue;

		if (partitioned)
			dev = makedev(mdp_major(), dev_minor << MdpMinorShift);
		else
			dev = makedev(MD_MAJOR, dev_minor);
		create_dev(name, dev);
		for (i = 0; i < MD_SB_DISKS && devname != 0; i++) {
			char *p;

			p = strchr(devname, ',');
			if (p)
				*p++ = 0;

			dev = name_to_dev_t(devname);
			if (!dev) {
				fprintf(stderr, "md: Unknown device name: %s\n",
					devname);
				break;
			}

			devices[i] = dev;

			devname = p;
		}
		devices[i] = 0;

		if (!i)
			continue;

		fprintf(stderr, "md: Loading md%s%d: %s\n",
			partitioned ? "_d" : "", dev_minor,
			md_setup_args[ent].device_names);

		fd = open(name, 0, 0);
		if (fd < 0) {
			fprintf(stderr, "md: open failed - cannot start "
				"array %s\n", name);
			continue;
		}
		if (ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
			fprintf(stderr,
				"md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
				dev_minor);
			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 = dev_minor;
			ainfo.not_persistent = 1;

			ainfo.state = (1 << MD_SB_CLEAN);
			ainfo.layout = 0;
			ainfo.chunk_size = md_setup_args[ent].chunk;
			err = ioctl(fd, SET_ARRAY_INFO, &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 = ioctl(fd, ADD_NEW_DISK, &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);
				ioctl(fd, ADD_NEW_DISK, &dinfo);
			}
		}
		if (!err)
			err = ioctl(fd, RUN_ARRAY, 0);
		if (err)
			fprintf(stderr, "md: starting md%d failed\n",
				dev_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
			 */
			close(fd);
			fd = open(name, 0, 0);
			ioctl(fd, BLKRRPART, 0);
		}
		close(fd);
	}
}

static int 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;
}

static void md_run_setup(void)
{
	create_dev("/dev/md0", makedev(MD_MAJOR, 0));
	if (raid_noautodetect)
		fprintf(stderr,
			"md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
	else {
		int fd = open("/dev/md0", 0, 0);
		if (fd >= 0) {
			ioctl(fd, RAID_AUTORUN,
			      (void *)(intptr_t) raid_autopart);
			close(fd);
		}
	}
	md_setup_drive();
}

void md_run(int argc, char *argv[])
{
	char **pp, *p;

	for (pp = argv; (p = *pp); pp++) {
		if (!strncmp(p, "raid=", 5))
			raid_setup(p + 5);
		else if (!strncmp(p, "md=", 3))
			md_setup(p + 3);
	}

	md_run_setup();
}
1	/*
2	* Handle autoconfiguration of md devices. This is ugly, partially since
3	* it still relies on a sizable kernel component.
4	*
5	* This file is derived from the Linux kernel.
6	*/
7
8	#include <ctype.h>
9	#include <errno.h>
10	#include <fcntl.h>
11	#include <sys/mount.h>
12	#include <sys/stat.h>
13	#include <stdio.h>
14	#include <stdlib.h>
15	#include <string.h>
16	#include <unistd.h>
17	#include <alloca.h>
18	#include <inttypes.h>
19	#include <sys/sysmacros.h>
20	#include <sys/md.h>
21	#include <linux/major.h>
22
23	#include "kinit.h"
24	#include "do_mounts.h"
25
26	#define LEVEL_NONE (-1000000)
27
28	/*
29	* When md (and any require personalities) are compiled into the kernel
30	* (not a module), arrays can be assembles are boot time using with AUTODETECT
31	* where specially marked partitions are registered with md_autodetect_dev(),
32	* and with MD_BOOT where devices to be collected are given on the boot line
33	* with md=.....
34	* The code for that is here.
35	*/
36
37	static int raid_noautodetect, raid_autopart;
38
39	static struct {
40	int minor;
41	int partitioned;
42	int level;
43	int chunk;
44	char *device_names;
45	} md_setup_args[MAX_MD_DEVS];
46
47	static int md_setup_ents;
48
49	/**
50	* get_option - Parse integer from an option string
51	* @str: option string
52	* @pint: (output) integer value parsed from @str
53	*
54	* Read an int from an option string; if available accept a subsequent
55	* comma as well.
56	*
57	* Return values:
58	* 0 : no int in string
59	* 1 : int found, no subsequent comma
60	* 2 : int found including a subsequent comma
61	*/
62
63	static int get_option(char *str, int pint)
64	{
65	char cur = str;
66
67	if (!cur \|\| !(*cur))
68	return 0;
69	*pint = strtol(cur, str, 0);
70	if (cur == *str)
71	return 0;
72	if (**str == ',') {
73	(*str)++;
74	return 2;
75	}
76
77	return 1;
78	}
79
80	/*
81	* Find the partitioned md device major number... of course this HAD
82	* to be done dynamically instead of using a registered number.
83	* Sigh. Double sigh.
84	*/
85	static int mdp_major(void)
86	{
87	static int found = 0;
88	FILE *f;
89	char line[512], *p;
90	int is_blk, major_no;
91
92	if (found)
93	return found;
94
95	f = fopen("/proc/devices", "r");
96	is_blk = 0;
97	while (fgets(line, sizeof line, f)) {
98	if (!strcmp(line, "Block devices:\n"))
99	is_blk = 1;
100	if (is_blk) {
101	major_no = strtol(line, &p, 10);
102	while (p && isspace(p))
103	p++;
104
105	if (major_no == 0) /* Not a number */
106	is_blk = 0;
107	else if (major_no > 0 && !strcmp(p, "mdp")) {
108	found = major_no;
109	break;
110	}
111	}
112	}
113	fclose(f);
114
115	if (!found) {
116	fprintf(stderr,
117	"Error: mdp devices detected but no mdp device found!\n");
118	exit(1);
119	}
120
121	return found;
122	}
123
124	/*
125	* Parse the command-line parameters given our kernel, but do not
126	* actually try to invoke the MD device now; that is handled by
127	* md_setup_drive after the low-level disk drivers have initialised.
128	*
129	* 27/11/1999: Fixed to work correctly with the 2.3 kernel (which
130	* assigns the task of parsing integer arguments to the
131	* invoked program now). Added ability to initialise all
132	* the MD devices (by specifying multiple "md=" lines)
133	* instead of just one. -- KTK
134	* 18May2000: Added support for persistent-superblock arrays:
135	* md=n,0,factor,fault,device-list uses RAID0 for device n
136	* md=n,-1,factor,fault,device-list uses LINEAR for device n
137	* md=n,device-list reads a RAID superblock from the devices
138	* elements in device-list are read by name_to_kdev_t so can be
139	* a hex number or something like /dev/hda1 /dev/sdb
140	* 2001-06-03: Dave Cinege <dcinege@psychosis.com>
141	* Shifted name_to_kdev_t() and related operations to md_set_drive()
142	* for later execution. Rewrote section to make devfs compatible.
143	*/
144	static int md_setup(char *str)
145	{
146	int minor_num, level, factor, fault, partitioned = 0;
147	char *pername = "";
148	char *str1;
149	int ent;
150
151	if (*str == 'd') {
152	partitioned = 1;
153	str++;
154	}
155	if (get_option(&str, &minor_num) != 2) { /* MD Number */
156	fprintf(stderr, "md: Too few arguments supplied to md=.\n");
157	return 0;
158	}
159	str1 = str;
160	if (minor_num >= MAX_MD_DEVS) {
161	fprintf(stderr, "md: md=%d, Minor device number too high.\n",
162	minor_num);
163	return 0;
164	}
165	for (ent = 0; ent < md_setup_ents; ent++)
166	if (md_setup_args[ent].minor == minor_num &&
167	md_setup_args[ent].partitioned == partitioned) {
168	fprintf(stderr,
169	"md: md=%s%d, Specified more than once. "
170	"Replacing previous definition.\n",
171	partitioned ? "d" : "", minor_num);
172	break;
173	}
174	if (ent >= MAX_MD_DEVS) {
175	fprintf(stderr, "md: md=%s%d - too many md initialisations\n",
176	partitioned ? "d" : "", minor_num);
177	return 0;
178	}
179	if (ent >= md_setup_ents)
180	md_setup_ents++;
181	switch (get_option(&str, &level)) { /* RAID level */
182	case 2: /* could be 0 or -1.. */
183	if (level == 0 \|\| level == LEVEL_LINEAR) {
184	if (get_option(&str, &factor) != 2 \|\| /* Chunk Size */
185	get_option(&str, &fault) != 2) {
186	fprintf(stderr,
187	"md: Too few arguments supplied to md=.\n");
188	return 0;
189	}
190	md_setup_args[ent].level = level;
191	md_setup_args[ent].chunk = 1 << (factor + 12);
192	if (level == LEVEL_LINEAR)
193	pername = "linear";
194	else
195	pername = "raid0";
196	break;
197	}
198	/* FALL THROUGH */
199	case 1: /* the first device is numeric */
200	str = str1;
201	/* FALL THROUGH */
202	case 0:
203	md_setup_args[ent].level = LEVEL_NONE;
204	pername = "super-block";
205	}
206
207	fprintf(stderr, "md: Will configure md%s%d (%s) from %s, below.\n",
208	partitioned?"_d":"", minor_num, pername, str);
209	md_setup_args[ent].device_names = str;
210	md_setup_args[ent].partitioned = partitioned;
211	md_setup_args[ent].minor = minor_num;
212
213	return 1;
214	}
215
216	#define MdpMinorShift 6
217
218	static void md_setup_drive(void)
219	{
220	int dev_minor, i, ent, partitioned;
221	dev_t dev;
222	dev_t devices[MD_SB_DISKS + 1];
223
224	for (ent = 0; ent < md_setup_ents; ent++) {
225	int fd;
226	int err = 0;
227	char *devname;
228	mdu_disk_info_t dinfo;
229	char name[16];
230	struct stat st_chk;
231
232	dev_minor = md_setup_args[ent].minor;
233	partitioned = md_setup_args[ent].partitioned;
234	devname = md_setup_args[ent].device_names;
235
236	snprintf(name, sizeof name,
237	"/dev/md%s%d", partitioned ? "_d" : "", dev_minor);
238
239	if (stat(name, &st_chk) == 0)
240	continue;
241
242	if (partitioned)
243	dev = makedev(mdp_major(), dev_minor << MdpMinorShift);
244	else
245	dev = makedev(MD_MAJOR, dev_minor);
246	create_dev(name, dev);
247	for (i = 0; i < MD_SB_DISKS && devname != 0; i++) {
248	char *p;
249
250	p = strchr(devname, ',');
251	if (p)
252	*p++ = 0;
253
254	dev = name_to_dev_t(devname);
255	if (!dev) {
256	fprintf(stderr, "md: Unknown device name: %s\n",
257	devname);
258	break;
259	}
260
261	devices[i] = dev;
262
263	devname = p;
264	}
265	devices[i] = 0;
266
267	if (!i)
268	continue;
269
270	fprintf(stderr, "md: Loading md%s%d: %s\n",
271	partitioned ? "_d" : "", dev_minor,
272	md_setup_args[ent].device_names);
273
274	fd = open(name, 0, 0);
275	if (fd < 0) {
276	fprintf(stderr, "md: open failed - cannot start "
277	"array %s\n", name);
278	continue;
279	}
280	if (ioctl(fd, SET_ARRAY_INFO, 0) == -EBUSY) {
281	fprintf(stderr,
282	"md: Ignoring md=%d, already autodetected. (Use raid=noautodetect)\n",
283	dev_minor);
284	close(fd);
285	continue;
286	}
287
288	if (md_setup_args[ent].level != LEVEL_NONE) {
289	/* non-persistent */
290	mdu_array_info_t ainfo;
291	ainfo.level = md_setup_args[ent].level;
292	ainfo.size = 0;
293	ainfo.nr_disks = 0;
294	ainfo.raid_disks = 0;
295	while (devices[ainfo.raid_disks])
296	ainfo.raid_disks++;
297	ainfo.md_minor = dev_minor;
298	ainfo.not_persistent = 1;
299
300	ainfo.state = (1 << MD_SB_CLEAN);
301	ainfo.layout = 0;
302	ainfo.chunk_size = md_setup_args[ent].chunk;
303	err = ioctl(fd, SET_ARRAY_INFO, &ainfo);
304	for (i = 0; !err && i <= MD_SB_DISKS; i++) {
305	dev = devices[i];
306	if (!dev)
307	break;
308	dinfo.number = i;
309	dinfo.raid_disk = i;
310	dinfo.state =
311	(1 << MD_DISK_ACTIVE) \| (1 << MD_DISK_SYNC);
312	dinfo.major = major(dev);
313	dinfo.minor = minor(dev);
314	err = ioctl(fd, ADD_NEW_DISK, &dinfo);
315	}
316	} else {
317	/* persistent */
318	for (i = 0; i <= MD_SB_DISKS; i++) {
319	dev = devices[i];
320	if (!dev)
321	break;
322	dinfo.major = major(dev);
323	dinfo.minor = minor(dev);
324	ioctl(fd, ADD_NEW_DISK, &dinfo);
325	}
326	}
327	if (!err)
328	err = ioctl(fd, RUN_ARRAY, 0);
329	if (err)
330	fprintf(stderr, "md: starting md%d failed\n",
331	dev_minor);
332	else {
333	/* reread the partition table.
334	* I (neilb) and not sure why this is needed, but I cannot
335	* boot a kernel with devfs compiled in from partitioned md
336	* array without it
337	*/
338	close(fd);
339	fd = open(name, 0, 0);
340	ioctl(fd, BLKRRPART, 0);
341	}
342	close(fd);
343	}
344	}
345
346	static int raid_setup(char *str)
347	{
348	int len, pos;
349
350	len = strlen(str) + 1;
351	pos = 0;
352
353	while (pos < len) {
354	char *comma = strchr(str + pos, ',');
355	int wlen;
356	if (comma)
357	wlen = (comma - str) - pos;
358	else
359	wlen = (len - 1) - pos;
360
361	if (!strncmp(str, "noautodetect", wlen))
362	raid_noautodetect = 1;
363	if (strncmp(str, "partitionable", wlen) == 0)
364	raid_autopart = 1;
365	if (strncmp(str, "part", wlen) == 0)
366	raid_autopart = 1;
367	pos += wlen + 1;
368	}
369	return 1;
370	}
371
372	static void md_run_setup(void)
373	{
374	create_dev("/dev/md0", makedev(MD_MAJOR, 0));
375	if (raid_noautodetect)
376	fprintf(stderr,
377	"md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
378	else {
379	int fd = open("/dev/md0", 0, 0);
380	if (fd >= 0) {
381	ioctl(fd, RAID_AUTORUN,
382	(void *)(intptr_t) raid_autopart);
383	close(fd);
384	}
385	}
386	md_setup_drive();
387	}
388
389	void md_run(int argc, char *argv[])
390	{
391	char *pp, p;
392
393	for (pp = argv; (p = *pp); pp++) {
394	if (!strncmp(p, "raid=", 5))
395	raid_setup(p + 5);
396	else if (!strncmp(p, "md=", 3))
397	md_setup(p + 3);
398	}
399
400	md_run_setup();
401	}