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