[thirdparty/mdadm.git] / sysfs.c

/*
 * sysfs - extract md related information from sysfs.  Part of:
 * mdadm - manage Linux "md" devices aka RAID arrays.
 *
 * Copyright (C) 2006 Neil Brown <neilb@suse.de>
 *
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *    Author: Neil Brown
 *    Email: <neilb@suse.de>
 */

#include	"mdadm.h"
#include	<dirent.h>

int load_sys(char *path, char *buf)
{
	int fd = open(path, O_RDONLY);
	int n;
	if (fd < 0)
		return -1;
	n = read(fd, buf, 1024);
	close(fd);
	if (n <=0 || n >= 1024)
		return -1;
	buf[n] = 0;
	if (buf[n-1] == '\n')
		buf[n-1] = 0;
	return 0;
}

void sysfs_free(struct mdinfo *sra)
{
	while (sra) {
		struct mdinfo *sra2 = sra->next;
		while (sra->devs) {
			struct mdinfo *d = sra->devs;
			sra->devs = d->next;
			free(d);
		}
		free(sra);
		sra = sra2;
	}
}

struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options)
{
	/* Longest possible name in sysfs, mounted at /sys, is
	 *  /sys/block/md_dXXX/md/dev-XXXXX/block/dev
	 *  /sys/block/md_dXXX/md/metadata_version
	 * which is about 41 characters.  50 should do for now
	 */
	char fname[50];
	char buf[1024];
	char *base;
	char *dbase;
	struct mdinfo *sra;
	struct mdinfo *dev;
	DIR *dir;
	struct dirent *de;

	sra = malloc(sizeof(*sra));
	if (sra == NULL)
		return sra;
	sra->next = NULL;

	if (fd >= 0) {
		struct stat stb;
		mdu_version_t vers;
 		if (fstat(fd, &stb)) return NULL;
		if (ioctl(fd, RAID_VERSION, &vers) != 0)
			return NULL;
		if (major(stb.st_rdev)==9)
			sprintf(sra->sys_name, "md%d", minor(stb.st_rdev));
		else
			sprintf(sra->sys_name, "md_d%d",
				minor(stb.st_rdev)>>MdpMinorShift);
	} else {
		if (devnum >= 0)
			sprintf(sra->sys_name, "md%d", devnum);
		else
			sprintf(sra->sys_name, "md_d%d",
				-1-devnum);
	}
	sprintf(fname, "/sys/block/%s/md/", sra->sys_name);
	base = fname + strlen(fname);

	sra->devs = NULL;
	if (options & GET_VERSION) {
		strcpy(base, "metadata_version");
		if (load_sys(fname, buf))
			goto abort;
		if (strncmp(buf, "none", 4) == 0)
			sra->array.major_version =
				sra->array.minor_version = -1;
		else
			sscanf(buf, "%d.%d",
			       &sra->array.major_version,
			       &sra->array.minor_version);
	}
	if (options & GET_LEVEL) {
		strcpy(base, "level");
		if (load_sys(fname, buf))
			goto abort;
		sra->array.level = map_name(pers, buf);
	}
	if (options & GET_LAYOUT) {
		strcpy(base, "layout");
		if (load_sys(fname, buf))
			goto abort;
		sra->array.layout = strtoul(buf, NULL, 0);
	}
	if (options & GET_COMPONENT) {
		strcpy(base, "component_size");
		if (load_sys(fname, buf))
			goto abort;
		sra->component_size = strtoull(buf, NULL, 0);
		/* sysfs reports "K", but we want sectors */
		sra->component_size *= 2;
	}
	if (options & GET_CHUNK) {
		strcpy(base, "chunk_size");
		if (load_sys(fname, buf))
			goto abort;
		sra->array.chunk_size = strtoul(buf, NULL, 0);
	}
	if (options & GET_CACHE) {
		strcpy(base, "stripe_cache_size");
		if (load_sys(fname, buf))
			goto abort;
		sra->cache_size = strtoul(buf, NULL, 0);
	}
	if (options & GET_MISMATCH) {
		strcpy(base, "mismatch_cnt");
		if (load_sys(fname, buf))
			goto abort;
		sra->mismatch_cnt = strtoul(buf, NULL, 0);
	}

	if (! (options & GET_DEVS))
		return sra;

	/* Get all the devices as well */
	*base = 0;
	dir = opendir(fname);
	if (!dir)
		goto abort;
	sra->array.spare_disks = 0;

	while ((de = readdir(dir)) != NULL) {
		char *ep;
		if (de->d_ino == 0 ||
		    strncmp(de->d_name, "dev-", 4) != 0)
			continue;
		strcpy(base, de->d_name);
		dbase = base + strlen(base);
		*dbase++ = '/';

		dev = malloc(sizeof(*dev));
		if (!dev)
			goto abort;
		dev->next = sra->devs;
		sra->devs = dev;
		strcpy(dev->sys_name, de->d_name);

		/* Always get slot, major, minor */
		strcpy(dbase, "slot");
		if (load_sys(fname, buf))
			goto abort;
		dev->disk.raid_disk = strtoul(buf, &ep, 10);
		if (*ep) dev->disk.raid_disk = -1;

		strcpy(dbase, "block/dev");
		if (load_sys(fname, buf))
			goto abort;
		sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor);

		if (options & GET_OFFSET) {
			strcpy(dbase, "offset");
			if (load_sys(fname, buf))
				goto abort;
			dev->data_offset = strtoull(buf, NULL, 0);
		}
		if (options & GET_SIZE) {
			strcpy(dbase, "size");
			if (load_sys(fname, buf))
				goto abort;
			dev->component_size = strtoull(buf, NULL, 0);
		}
		if (options & GET_STATE) {
			dev->disk.state = 0;
			strcpy(dbase, "state");
			if (load_sys(fname, buf))
				goto abort;
			if (strstr(buf, "in_sync"))
				dev->disk.state |= (1<<MD_DISK_SYNC);
			if (strstr(buf, "faulty"))
				dev->disk.state |= (1<<MD_DISK_FAULTY);
			if (dev->disk.state == 0)
				sra->array.spare_disks++;
		}
		if (options & GET_ERROR) {
			strcpy(buf, "errors");
			if (load_sys(fname, buf))
				goto abort;
			dev->errors = strtoul(buf, NULL, 0);
		}
	}
	return sra;

 abort:
	sysfs_free(sra);
	return NULL;
}

unsigned long long get_component_size(int fd)
{
	/* Find out the component size of the array.
	 * We cannot trust GET_ARRAY_INFO ioctl as it's
	 * size field is only 32bits.
	 * So look in /sys/block/mdXXX/md/component_size
	 *
	 * This returns in units of sectors.
	 */
	struct stat stb;
	char fname[50];
	int n;
	if (fstat(fd, &stb)) return 0;
	if (major(stb.st_rdev) == 9)
		sprintf(fname, "/sys/block/md%d/md/component_size",
			minor(stb.st_rdev));
	else
		sprintf(fname, "/sys/block/md_d%d/md/component_size",
			minor(stb.st_rdev)>>MdpMinorShift);
	fd = open(fname, O_RDONLY);
	if (fd < 0)
		return 0;
	n = read(fd, fname, sizeof(fname));
	close(fd);
	if (n == sizeof(fname))
		return 0;
	fname[n] = 0;
	return strtoull(fname, NULL, 10) * 2;
}

int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
		  char *name, char *val)
{
	char fname[50];
	int n;
	int fd;
	sprintf(fname, "/sys/block/%s/md/%s/%s",
		sra->sys_name, dev?dev->sys_name:"", name);
	fd = open(fname, O_WRONLY);
	if (fd < 0)
		return -1;
	n = write(fd, val, strlen(val));
	close(fd);
	if (n != strlen(val))
		return -1;
	return 0;
}

int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
		  char *name, unsigned long long val)
{
	char valstr[50];
	sprintf(valstr, "%llu", val);
	return sysfs_set_str(sra, dev, name, valstr);
}

int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
		       char *name, unsigned long long *val)
{
	char fname[50];
	char buf[50];
	int n;
	int fd;
	char *ep;
	sprintf(fname, "/sys/block/%s/md/%s/%s",
		sra->sys_name, dev?dev->sys_name:"", name);
	fd = open(fname, O_RDONLY);
	if (fd < 0)
		return -1;
	n = read(fd, buf, sizeof(buf));
	close(fd);
	if (n <= 0)
		return -1;
	buf[n] = 0;
	*val = strtoull(buf, &ep, 0);
	if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))
		return -1;
	return 0;
}
Commit	Line	Data
e86c9dd6 NB	1	/*
	2	* sysfs - extract md related information from sysfs. Part of:
	3	* mdadm - manage Linux "md" devices aka RAID arrays.
	4	*
	5	* Copyright (C) 2006 Neil Brown <neilb@suse.de>
	6	*
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*
	22	* Author: Neil Brown
	23	* Email: <neilb@suse.de>
	24	*/
	25
	26	#include "mdadm.h"
	27	#include <dirent.h>
	28
	29	int load_sys(char path, char buf)
	30	{
	31	int fd = open(path, O_RDONLY);
	32	int n;
	33	if (fd < 0)
	34	return -1;
	35	n = read(fd, buf, 1024);
	36	close(fd);
	37	if (n <=0 \|\| n >= 1024)
	38	return -1;
	39	buf[n] = 0;
	40	if (buf[n-1] == '\n')
	41	buf[n-1] = 0;
	42	return 0;
	43	}
	44
7e0f6979	45	void sysfs_free(struct mdinfo *sra)
8382f19b	46	{
7e0f6979 NB	47	while (sra) {
	48	struct mdinfo *sra2 = sra->next;
	49	while (sra->devs) {
	50	struct mdinfo *d = sra->devs;
	51	sra->devs = d->next;
	52	free(d);
	53	}
	54	free(sra);
	55	sra = sra2;
8382f19b	56	}
8382f19b NB	57	}
8382f19b NB	58
7e0f6979	59	struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options)
e86c9dd6 NB	60	{
	61	/* Longest possible name in sysfs, mounted at /sys, is
	62	* /sys/block/md_dXXX/md/dev-XXXXX/block/dev
	63	* /sys/block/md_dXXX/md/metadata_version
	64	* which is about 41 characters. 50 should do for now
	65	*/
	66	char fname[50];
	67	char buf[1024];
	68	char *base;
	69	char *dbase;
7e0f6979	70	struct mdinfo *sra;
06c7f68e	71	struct mdinfo *dev;
e86c9dd6 NB	72	DIR *dir;
	73	struct dirent *de;
	74
	75	sra = malloc(sizeof(*sra));
	76	if (sra == NULL)
	77	return sra;
7e0f6979	78	sra->next = NULL;
e86c9dd6 NB	79
	80	if (fd >= 0) {
	81	struct stat stb;
2faf1f5f NB	82	mdu_version_t vers;
	83	if (fstat(fd, &stb)) return NULL;
	84	if (ioctl(fd, RAID_VERSION, &vers) != 0)
	85	return NULL;
e86c9dd6	86	if (major(stb.st_rdev)==9)
7e0f6979	87	sprintf(sra->sys_name, "md%d", minor(stb.st_rdev));
e86c9dd6	88	else
7e0f6979	89	sprintf(sra->sys_name, "md_d%d",
7fa42a0b	90	minor(stb.st_rdev)>>MdpMinorShift);
e86c9dd6 NB	91	} else {
e86c9dd6 NB	92	if (devnum >= 0)
7e0f6979	93	sprintf(sra->sys_name, "md%d", devnum);
e86c9dd6	94	else
7e0f6979	95	sprintf(sra->sys_name, "md_d%d",
e86c9dd6 NB	96	-1-devnum);
e86c9dd6 NB	97	}
7e0f6979	98	sprintf(fname, "/sys/block/%s/md/", sra->sys_name);
e86c9dd6 NB	99	base = fname + strlen(fname);
	100
	101	sra->devs = NULL;
8382f19b NB	102	if (options & GET_VERSION) {
	103	strcpy(base, "metadata_version");
	104	if (load_sys(fname, buf))
	105	goto abort;
	106	if (strncmp(buf, "none", 4) == 0)
7e0f6979 NB	107	sra->array.major_version =
7e0f6979 NB	108	sra->array.minor_version = -1;
8382f19b NB	109	else
8382f19b NB	110	sscanf(buf, "%d.%d",
7e0f6979 NB	111	&sra->array.major_version,
7e0f6979 NB	112	&sra->array.minor_version);
8382f19b	113	}
e86c9dd6 NB	114	if (options & GET_LEVEL) {
	115	strcpy(base, "level");
	116	if (load_sys(fname, buf))
	117	goto abort;
7e0f6979	118	sra->array.level = map_name(pers, buf);
e86c9dd6 NB	119	}
	120	if (options & GET_LAYOUT) {
	121	strcpy(base, "layout");
	122	if (load_sys(fname, buf))
	123	goto abort;
7e0f6979	124	sra->array.layout = strtoul(buf, NULL, 0);
e86c9dd6 NB	125	}
	126	if (options & GET_COMPONENT) {
	127	strcpy(base, "component_size");
	128	if (load_sys(fname, buf))
	129	goto abort;
	130	sra->component_size = strtoull(buf, NULL, 0);
353632d9 NB	131	/* sysfs reports "K", but we want sectors */
353632d9 NB	132	sra->component_size *= 2;
e86c9dd6 NB	133	}
	134	if (options & GET_CHUNK) {
	135	strcpy(base, "chunk_size");
	136	if (load_sys(fname, buf))
	137	goto abort;
7e0f6979	138	sra->array.chunk_size = strtoul(buf, NULL, 0);
e86c9dd6	139	}
758d3a8e NB	140	if (options & GET_CACHE) {
	141	strcpy(base, "stripe_cache_size");
	142	if (load_sys(fname, buf))
	143	goto abort;
	144	sra->cache_size = strtoul(buf, NULL, 0);
	145	}
37dfc3d6 NB	146	if (options & GET_MISMATCH) {
	147	strcpy(base, "mismatch_cnt");
	148	if (load_sys(fname, buf))
	149	goto abort;
	150	sra->mismatch_cnt = strtoul(buf, NULL, 0);
	151	}
e86c9dd6 NB	152
	153	if (! (options & GET_DEVS))
	154	return sra;
	155
	156	/* Get all the devices as well */
	157	*base = 0;
	158	dir = opendir(fname);
	159	if (!dir)
	160	goto abort;
7e0f6979	161	sra->array.spare_disks = 0;
e86c9dd6 NB	162
	163	while ((de = readdir(dir)) != NULL) {
	164	char *ep;
	165	if (de->d_ino == 0 \|\|
	166	strncmp(de->d_name, "dev-", 4) != 0)
	167	continue;
	168	strcpy(base, de->d_name);
	169	dbase = base + strlen(base);
	170	*dbase++ = '/';
	171
	172	dev = malloc(sizeof(*dev));
	173	if (!dev)
	174	goto abort;
	175	dev->next = sra->devs;
	176	sra->devs = dev;
06c7f68e	177	strcpy(dev->sys_name, de->d_name);
e86c9dd6 NB	178
	179	/* Always get slot, major, minor */
	180	strcpy(dbase, "slot");
	181	if (load_sys(fname, buf))
	182	goto abort;
06c7f68e NB	183	dev->disk.raid_disk = strtoul(buf, &ep, 10);
06c7f68e NB	184	if (*ep) dev->disk.raid_disk = -1;
e86c9dd6 NB	185
	186	strcpy(dbase, "block/dev");
	187	if (load_sys(fname, buf))
	188	goto abort;
06c7f68e	189	sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor);
e86c9dd6 NB	190
	191	if (options & GET_OFFSET) {
	192	strcpy(dbase, "offset");
	193	if (load_sys(fname, buf))
	194	goto abort;
06c7f68e	195	dev->data_offset = strtoull(buf, NULL, 0);
e86c9dd6 NB	196	}
	197	if (options & GET_SIZE) {
	198	strcpy(dbase, "size");
	199	if (load_sys(fname, buf))
	200	goto abort;
06c7f68e	201	dev->component_size = strtoull(buf, NULL, 0);
e86c9dd6 NB	202	}
e86c9dd6 NB	203	if (options & GET_STATE) {
06c7f68e	204	dev->disk.state = 0;
e86c9dd6 NB	205	strcpy(dbase, "state");
	206	if (load_sys(fname, buf))
	207	goto abort;
	208	if (strstr(buf, "in_sync"))
06c7f68e	209	dev->disk.state \|= (1<<MD_DISK_SYNC);
e86c9dd6	210	if (strstr(buf, "faulty"))
06c7f68e NB	211	dev->disk.state \|= (1<<MD_DISK_FAULTY);
06c7f68e NB	212	if (dev->disk.state == 0)
7e0f6979	213	sra->array.spare_disks++;
e86c9dd6 NB	214	}
	215	if (options & GET_ERROR) {
	216	strcpy(buf, "errors");
	217	if (load_sys(fname, buf))
	218	goto abort;
	219	dev->errors = strtoul(buf, NULL, 0);
	220	}
	221	}
	222	return sra;
	223
	224	abort:
8382f19b	225	sysfs_free(sra);
e86c9dd6 NB	226	return NULL;
	227	}
	228
	229	unsigned long long get_component_size(int fd)
	230	{
	231	/* Find out the component size of the array.
	232	* We cannot trust GET_ARRAY_INFO ioctl as it's
	233	* size field is only 32bits.
	234	* So look in /sys/block/mdXXX/md/component_size
353632d9	235	*
8686f3ed	236	* This returns in units of sectors.
e86c9dd6 NB	237	*/
	238	struct stat stb;
	239	char fname[50];
	240	int n;
	241	if (fstat(fd, &stb)) return 0;
	242	if (major(stb.st_rdev) == 9)
	243	sprintf(fname, "/sys/block/md%d/md/component_size",
	244	minor(stb.st_rdev));
	245	else
	246	sprintf(fname, "/sys/block/md_d%d/md/component_size",
7fa42a0b	247	minor(stb.st_rdev)>>MdpMinorShift);
e86c9dd6 NB	248	fd = open(fname, O_RDONLY);
	249	if (fd < 0)
	250	return 0;
	251	n = read(fd, fname, sizeof(fname));
	252	close(fd);
	253	if (n == sizeof(fname))
	254	return 0;
	255	fname[n] = 0;
8686f3ed	256	return strtoull(fname, NULL, 10) * 2;
e86c9dd6 NB	257	}
e86c9dd6 NB	258
7e0f6979	259	int sysfs_set_str(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	260	char name, char val)
	261	{
	262	char fname[50];
	263	int n;
	264	int fd;
	265	sprintf(fname, "/sys/block/%s/md/%s/%s",
7e0f6979	266	sra->sys_name, dev?dev->sys_name:"", name);
e86c9dd6 NB	267	fd = open(fname, O_WRONLY);
	268	if (fd < 0)
	269	return -1;
	270	n = write(fd, val, strlen(val));
	271	close(fd);
	272	if (n != strlen(val))
	273	return -1;
	274	return 0;
	275	}
	276
7e0f6979	277	int sysfs_set_num(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	278	char *name, unsigned long long val)
	279	{
	280	char valstr[50];
	281	sprintf(valstr, "%llu", val);
	282	return sysfs_set_str(sra, dev, name, valstr);
	283	}
	284
7e0f6979	285	int sysfs_get_ll(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	286	char name, unsigned long long val)
	287	{
	288	char fname[50];
	289	char buf[50];
	290	int n;
	291	int fd;
	292	char *ep;
	293	sprintf(fname, "/sys/block/%s/md/%s/%s",
7e0f6979	294	sra->sys_name, dev?dev->sys_name:"", name);
e86c9dd6 NB	295	fd = open(fname, O_RDONLY);
	296	if (fd < 0)
	297	return -1;
	298	n = read(fd, buf, sizeof(buf));
	299	close(fd);
	300	if (n <= 0)
	301	return -1;
	302	buf[n] = 0;
	303	*val = strtoull(buf, &ep, 0);
	304	if (ep == buf \|\| (ep != 0 && ep != '\n' && *ep != ' '))
	305	return -1;
	306	return 0;
	307	}