[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;
	}
}

int sysfs_open(int devnum, char *devname, char *attr)
{
	char fname[50];
	char sys_name[16];
	int fd;
	if (devnum >= 0)
		sprintf(sys_name, "md%d", devnum);
	else
		sprintf(sys_name, "md_d%d",
			-1-devnum);

	sprintf(fname, "/sys/block/%s/md/", sys_name);
	if (devname) {
		strcat(fname, devname);
		strcat(fname, "/");
	}
	strcat(fname, attr);
	fd = open(fname, O_RDWR);
	if (fd < 0 && errno == -EACCES)
		fd = open(fname, O_RDONLY);
	return fd;
}

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", (int)minor(stb.st_rdev));
		else
			sprintf(sra->sys_name, "md_d%d",
				(int)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;
			strcpy(sra->text_version, "");
		} else if (strncmp(buf, "external:", 9) == 0) {
			sra->array.major_version = -1;
			sra->array.minor_version = -2;
			strcpy(sra->text_version, buf+9);
		} 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_DISKS) {
		strcpy(base, "raid_disks");
		if (load_sys(fname, buf))
			goto abort;
		sra->array.raid_disks = 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",
			(int)minor(stb.st_rdev));
	else
		sprintf(fname, "/sys/block/md_d%d/md/component_size",
			(int)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;
}

int sysfs_set_array(struct mdinfo *sra,
		    struct mdinfo *info)
{
	int rv = 0;
	sra->array = info->array;

	if (info->array.level < 0)
		return 0; /* FIXME */
	rv |= sysfs_set_str(sra, NULL, "level",
			    map_num(pers, info->array.level));
	rv |= sysfs_set_num(sra, NULL, "raid_disks", info->array.raid_disks);
	rv |= sysfs_set_num(sra, NULL, "chunk_size", info->array.chunk_size);
	rv |= sysfs_set_num(sra, NULL, "layout", info->array.layout);
	rv |= sysfs_set_num(sra, NULL, "component_size", info->component_size);
	rv |= sysfs_set_num(sra, NULL, "resync_start", info->resync_start);
	sra->array = info->array;
	return rv;
}

int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd)
{
	char dv[100];
	char nm[100];
	struct mdinfo *sd2;
	char *dname;
	int rv;

	sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor);
	rv = sysfs_set_str(sra, NULL, "new_dev", dv);
	if (rv)
		return rv;

	memset(nm, 0, sizeof(nm));
	sprintf(dv, "/sys/dev/block/%d:%d", sd->disk.major, sd->disk.minor);
	if (readlink(dv, nm, sizeof(nm)) < 0)
		return -1;
	dname = strrchr(nm, '/');
	if (dname) dname++;
	strcpy(sd->sys_name, "dev-");
	strcpy(sd->sys_name+4, dname);

	rv |= sysfs_set_num(sra, sd, "offset", sd->data_offset);
	rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2);
	if (sra->array.level != LEVEL_CONTAINER) {
		rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk);
//		rv |= sysfs_set_str(sra, sd, "state", "in_sync");
	}
	sd2 = malloc(sizeof(*sd2));
	*sd2 = *sd;
	sd2->next = sra->devs;
	sra->devs = sd2;

	return rv;
}
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);
2f6079dc	37	if (n <0 \|\| n >= 1024)
e86c9dd6 NB	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
549e9569 NB	59	int sysfs_open(int devnum, char devname, char attr)
	60	{
	61	char fname[50];
	62	char sys_name[16];
	63	int fd;
	64	if (devnum >= 0)
	65	sprintf(sys_name, "md%d", devnum);
	66	else
	67	sprintf(sys_name, "md_d%d",
	68	-1-devnum);
	69
	70	sprintf(fname, "/sys/block/%s/md/", sys_name);
	71	if (devname) {
	72	strcat(fname, devname);
	73	strcat(fname, "/");
	74	}
	75	strcat(fname, attr);
	76	fd = open(fname, O_RDWR);
	77	if (fd < 0 && errno == -EACCES)
	78	fd = open(fname, O_RDONLY);
	79	return fd;
	80	}
	81
7e0f6979	82	struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options)
e86c9dd6 NB	83	{
	84	/* Longest possible name in sysfs, mounted at /sys, is
	85	* /sys/block/md_dXXX/md/dev-XXXXX/block/dev
	86	* /sys/block/md_dXXX/md/metadata_version
	87	* which is about 41 characters. 50 should do for now
	88	*/
	89	char fname[50];
	90	char buf[1024];
	91	char *base;
	92	char *dbase;
7e0f6979	93	struct mdinfo *sra;
06c7f68e	94	struct mdinfo *dev;
e86c9dd6 NB	95	DIR *dir;
	96	struct dirent *de;
	97
	98	sra = malloc(sizeof(*sra));
	99	if (sra == NULL)
	100	return sra;
7e0f6979	101	sra->next = NULL;
e86c9dd6 NB	102
	103	if (fd >= 0) {
	104	struct stat stb;
2faf1f5f NB	105	mdu_version_t vers;
	106	if (fstat(fd, &stb)) return NULL;
	107	if (ioctl(fd, RAID_VERSION, &vers) != 0)
	108	return NULL;
e86c9dd6	109	if (major(stb.st_rdev)==9)
ea24acd0	110	sprintf(sra->sys_name, "md%d", (int)minor(stb.st_rdev));
e86c9dd6	111	else
7e0f6979	112	sprintf(sra->sys_name, "md_d%d",
ea24acd0	113	(int)minor(stb.st_rdev)>>MdpMinorShift);
e86c9dd6 NB	114	} else {
e86c9dd6 NB	115	if (devnum >= 0)
7e0f6979	116	sprintf(sra->sys_name, "md%d", devnum);
e86c9dd6	117	else
7e0f6979	118	sprintf(sra->sys_name, "md_d%d",
e86c9dd6 NB	119	-1-devnum);
e86c9dd6 NB	120	}
7e0f6979	121	sprintf(fname, "/sys/block/%s/md/", sra->sys_name);
e86c9dd6 NB	122	base = fname + strlen(fname);
	123
	124	sra->devs = NULL;
8382f19b NB	125	if (options & GET_VERSION) {
	126	strcpy(base, "metadata_version");
	127	if (load_sys(fname, buf))
	128	goto abort;
294d6f45	129	if (strncmp(buf, "none", 4) == 0) {
7e0f6979 NB	130	sra->array.major_version =
7e0f6979 NB	131	sra->array.minor_version = -1;
294d6f45 NB	132	strcpy(sra->text_version, "");
294d6f45 NB	133	} else if (strncmp(buf, "external:", 9) == 0) {
142cb9e1 NB	134	sra->array.major_version = -1;
	135	sra->array.minor_version = -2;
	136	strcpy(sra->text_version, buf+9);
	137	} else
8382f19b	138	sscanf(buf, "%d.%d",
7e0f6979 NB	139	&sra->array.major_version,
7e0f6979 NB	140	&sra->array.minor_version);
8382f19b	141	}
e86c9dd6 NB	142	if (options & GET_LEVEL) {
	143	strcpy(base, "level");
	144	if (load_sys(fname, buf))
	145	goto abort;
7e0f6979	146	sra->array.level = map_name(pers, buf);
e86c9dd6 NB	147	}
	148	if (options & GET_LAYOUT) {
	149	strcpy(base, "layout");
	150	if (load_sys(fname, buf))
	151	goto abort;
7e0f6979	152	sra->array.layout = strtoul(buf, NULL, 0);
e86c9dd6	153	}
549e9569 NB	154	if (options & GET_DISKS) {
	155	strcpy(base, "raid_disks");
	156	if (load_sys(fname, buf))
	157	goto abort;
	158	sra->array.raid_disks = strtoul(buf, NULL, 0);
	159	}
e86c9dd6 NB	160	if (options & GET_COMPONENT) {
	161	strcpy(base, "component_size");
	162	if (load_sys(fname, buf))
	163	goto abort;
	164	sra->component_size = strtoull(buf, NULL, 0);
353632d9 NB	165	/* sysfs reports "K", but we want sectors */
353632d9 NB	166	sra->component_size *= 2;
e86c9dd6 NB	167	}
	168	if (options & GET_CHUNK) {
	169	strcpy(base, "chunk_size");
	170	if (load_sys(fname, buf))
	171	goto abort;
7e0f6979	172	sra->array.chunk_size = strtoul(buf, NULL, 0);
e86c9dd6	173	}
758d3a8e NB	174	if (options & GET_CACHE) {
	175	strcpy(base, "stripe_cache_size");
	176	if (load_sys(fname, buf))
	177	goto abort;
	178	sra->cache_size = strtoul(buf, NULL, 0);
	179	}
37dfc3d6 NB	180	if (options & GET_MISMATCH) {
	181	strcpy(base, "mismatch_cnt");
	182	if (load_sys(fname, buf))
	183	goto abort;
	184	sra->mismatch_cnt = strtoul(buf, NULL, 0);
	185	}
e86c9dd6 NB	186
	187	if (! (options & GET_DEVS))
	188	return sra;
	189
	190	/* Get all the devices as well */
	191	*base = 0;
	192	dir = opendir(fname);
	193	if (!dir)
	194	goto abort;
7e0f6979	195	sra->array.spare_disks = 0;
e86c9dd6 NB	196
	197	while ((de = readdir(dir)) != NULL) {
	198	char *ep;
	199	if (de->d_ino == 0 \|\|
	200	strncmp(de->d_name, "dev-", 4) != 0)
	201	continue;
	202	strcpy(base, de->d_name);
	203	dbase = base + strlen(base);
	204	*dbase++ = '/';
	205
	206	dev = malloc(sizeof(*dev));
	207	if (!dev)
	208	goto abort;
	209	dev->next = sra->devs;
	210	sra->devs = dev;
06c7f68e	211	strcpy(dev->sys_name, de->d_name);
e86c9dd6 NB	212
	213	/* Always get slot, major, minor */
	214	strcpy(dbase, "slot");
	215	if (load_sys(fname, buf))
	216	goto abort;
06c7f68e NB	217	dev->disk.raid_disk = strtoul(buf, &ep, 10);
06c7f68e NB	218	if (*ep) dev->disk.raid_disk = -1;
e86c9dd6 NB	219
	220	strcpy(dbase, "block/dev");
	221	if (load_sys(fname, buf))
	222	goto abort;
06c7f68e	223	sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor);
e86c9dd6 NB	224
	225	if (options & GET_OFFSET) {
	226	strcpy(dbase, "offset");
	227	if (load_sys(fname, buf))
	228	goto abort;
06c7f68e	229	dev->data_offset = strtoull(buf, NULL, 0);
e86c9dd6 NB	230	}
	231	if (options & GET_SIZE) {
	232	strcpy(dbase, "size");
	233	if (load_sys(fname, buf))
	234	goto abort;
06c7f68e	235	dev->component_size = strtoull(buf, NULL, 0);
e86c9dd6 NB	236	}
e86c9dd6 NB	237	if (options & GET_STATE) {
06c7f68e	238	dev->disk.state = 0;
e86c9dd6 NB	239	strcpy(dbase, "state");
	240	if (load_sys(fname, buf))
	241	goto abort;
	242	if (strstr(buf, "in_sync"))
06c7f68e	243	dev->disk.state \|= (1<<MD_DISK_SYNC);
e86c9dd6	244	if (strstr(buf, "faulty"))
06c7f68e NB	245	dev->disk.state \|= (1<<MD_DISK_FAULTY);
06c7f68e NB	246	if (dev->disk.state == 0)
7e0f6979	247	sra->array.spare_disks++;
e86c9dd6 NB	248	}
	249	if (options & GET_ERROR) {
	250	strcpy(buf, "errors");
	251	if (load_sys(fname, buf))
	252	goto abort;
	253	dev->errors = strtoul(buf, NULL, 0);
	254	}
	255	}
	256	return sra;
	257
	258	abort:
8382f19b	259	sysfs_free(sra);
e86c9dd6 NB	260	return NULL;
	261	}
	262
	263	unsigned long long get_component_size(int fd)
	264	{
	265	/* Find out the component size of the array.
	266	* We cannot trust GET_ARRAY_INFO ioctl as it's
	267	* size field is only 32bits.
	268	* So look in /sys/block/mdXXX/md/component_size
353632d9	269	*
8686f3ed	270	* This returns in units of sectors.
e86c9dd6 NB	271	*/
	272	struct stat stb;
	273	char fname[50];
	274	int n;
	275	if (fstat(fd, &stb)) return 0;
	276	if (major(stb.st_rdev) == 9)
	277	sprintf(fname, "/sys/block/md%d/md/component_size",
ea24acd0	278	(int)minor(stb.st_rdev));
e86c9dd6 NB	279	else
e86c9dd6 NB	280	sprintf(fname, "/sys/block/md_d%d/md/component_size",
ea24acd0	281	(int)minor(stb.st_rdev)>>MdpMinorShift);
e86c9dd6 NB	282	fd = open(fname, O_RDONLY);
	283	if (fd < 0)
	284	return 0;
	285	n = read(fd, fname, sizeof(fname));
	286	close(fd);
	287	if (n == sizeof(fname))
	288	return 0;
	289	fname[n] = 0;
8686f3ed	290	return strtoull(fname, NULL, 10) * 2;
e86c9dd6 NB	291	}
e86c9dd6 NB	292
7e0f6979	293	int sysfs_set_str(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	294	char name, char val)
	295	{
	296	char fname[50];
	297	int n;
	298	int fd;
	299	sprintf(fname, "/sys/block/%s/md/%s/%s",
7e0f6979	300	sra->sys_name, dev?dev->sys_name:"", name);
e86c9dd6 NB	301	fd = open(fname, O_WRONLY);
	302	if (fd < 0)
	303	return -1;
	304	n = write(fd, val, strlen(val));
	305	close(fd);
	306	if (n != strlen(val))
	307	return -1;
	308	return 0;
	309	}
	310
7e0f6979	311	int sysfs_set_num(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	312	char *name, unsigned long long val)
	313	{
	314	char valstr[50];
	315	sprintf(valstr, "%llu", val);
	316	return sysfs_set_str(sra, dev, name, valstr);
	317	}
	318
7e0f6979	319	int sysfs_get_ll(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	320	char name, unsigned long long val)
	321	{
	322	char fname[50];
	323	char buf[50];
	324	int n;
	325	int fd;
	326	char *ep;
	327	sprintf(fname, "/sys/block/%s/md/%s/%s",
7e0f6979	328	sra->sys_name, dev?dev->sys_name:"", name);
e86c9dd6 NB	329	fd = open(fname, O_RDONLY);
	330	if (fd < 0)
	331	return -1;
	332	n = read(fd, buf, sizeof(buf));
	333	close(fd);
	334	if (n <= 0)
	335	return -1;
	336	buf[n] = 0;
	337	*val = strtoull(buf, &ep, 0);
	338	if (ep == buf \|\| (ep != 0 && ep != '\n' && *ep != ' '))
	339	return -1;
	340	return 0;
	341	}
2503d23b NB	342
	343	int sysfs_set_array(struct mdinfo *sra,
	344	struct mdinfo *info)
	345	{
	346	int rv = 0;
	347	sra->array = info->array;
2f6079dc	348
2503d23b NB	349	if (info->array.level < 0)
	350	return 0; /* FIXME */
	351	rv \|= sysfs_set_str(sra, NULL, "level",
	352	map_num(pers, info->array.level));
	353	rv \|= sysfs_set_num(sra, NULL, "raid_disks", info->array.raid_disks);
	354	rv \|= sysfs_set_num(sra, NULL, "chunk_size", info->array.chunk_size);
	355	rv \|= sysfs_set_num(sra, NULL, "layout", info->array.layout);
	356	rv \|= sysfs_set_num(sra, NULL, "component_size", info->component_size);
0fd5c350	357	rv \|= sysfs_set_num(sra, NULL, "resync_start", info->resync_start);
2503d23b NB	358	sra->array = info->array;
	359	return rv;
	360	}
	361
2318b9f0	362	int sysfs_add_disk(struct mdinfo sra, struct mdinfo sd)
2503d23b NB	363	{
	364	char dv[100];
	365	char nm[100];
	366	struct mdinfo *sd2;
	367	char *dname;
	368	int rv;
	369
	370	sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor);
	371	rv = sysfs_set_str(sra, NULL, "new_dev", dv);
	372	if (rv)
	373	return rv;
	374
	375	memset(nm, 0, sizeof(nm));
	376	sprintf(dv, "/sys/dev/block/%d:%d", sd->disk.major, sd->disk.minor);
	377	if (readlink(dv, nm, sizeof(nm)) < 0)
	378	return -1;
	379	dname = strrchr(nm, '/');
	380	if (dname) dname++;
	381	strcpy(sd->sys_name, "dev-");
	382	strcpy(sd->sys_name+4, dname);
	383
	384	rv \|= sysfs_set_num(sra, sd, "offset", sd->data_offset);
	385	rv \|= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2);
	386	if (sra->array.level != LEVEL_CONTAINER) {
	387	rv \|= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk);
	388	// rv \|= sysfs_set_str(sra, sd, "state", "in_sync");
	389	}
	390	sd2 = malloc(sizeof(*sd2));
	391	sd2 = sd;
	392	sd2->next = sra->devs;
	393	sra->devs = sd2;
	394
	395	return rv;
	396	}