[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>
#include	<ctype.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 (n && 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];
	int fd;

	sprintf(fname, "/sys/block/%s/md/", devnum2devname(devnum));
	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 = NULL;
	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);
			strcpy(sra->text_version, buf);
		}
	}
	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_DEGRADED) {
		strcpy(base, "degraded");
		if (load_sys(fname, buf))
			goto abort;
		sra->array.failed_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_SAFEMODE) {
		int scale = 1;
		int dot = 0;
		int i;
		unsigned long msec;
		size_t len;

		strcpy(base, "safe_mode_delay");
		if (load_sys(fname, buf))
			goto abort;

		/* remove a period, and count digits after it */
		len = strlen(buf);
		for (i = 0; i < len; i++) {
			if (dot) {
				if (isdigit(buf[i])) {
					buf[i-1] = buf[i];
					scale *= 10;
				}
				buf[i] = 0;
			} else if (buf[i] == '.') {
				dot=1;
				buf[i] = 0;
			}
		}
		msec = strtoul(buf, NULL, 10);
		msec = (msec * 1000) / scale;
		sra->safe_mode_delay = msec;
	}

	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;

		/* Always get slot, major, minor */
		strcpy(dbase, "slot");
		if (load_sys(fname, buf)) {
			/* hmm... unable to read 'slot' maybe the device
			 * is going away?
			 */
			strcpy(dbase, "block");
			if (readlink(fname, buf, sizeof(buf)) < 0 &&
			    errno != ENAMETOOLONG) {
				/* ...yup device is gone */
				free(dev);
				continue;
			} else {
				/* slot is unreadable but 'block' link
				 * still intact... something bad is happening
				 * so abort
				 */
				free(dev);
				goto abort;
			}
			
		}
		dev->next = sra->devs;
		sra->devs = dev;

		strcpy(dev->sys_name, de->d_name);
		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) * 2;
		}
		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);
		}
	}
	closedir(dir);
	return sra;

 abort:
	if (dir)
		closedir(dir);
	sysfs_free(sra);
	return NULL;
}

int sysfs_attr_match(const char *attr, const char *str)
{
	/* See if attr, read from a sysfs file, matches
	 * str.  They must either be the same, or attr can
	 * have a trailing newline or comma
	 */
	while (*attr && *str && *attr == *str) {
		attr++;
		str++;
	}

	if (*str || (*attr && *attr != ',' && *attr != '\n'))
		return 0;
	return 1;
}

int sysfs_match_word(const char *word, char **list)
{
	int n;
	for (n=0; list[n]; n++)
		if (sysfs_attr_match(word, list[n]))
			break;
	return n;
}

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_safemode(struct mdinfo *sra, unsigned long ms)
{
	unsigned long sec;
	unsigned long msec;
	char delay[30];

	sec = ms / 1000;
	msec = ms - (sec * 1000);

	sprintf(delay, "%ld.%ld", sec, msec);
	return sysfs_set_str(sra, NULL, "safe_mode_delay", delay);
}

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/2);
	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];
	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);
	rv = readlink(dv, nm, sizeof(nm));
	if (rv <= 0)
		return -1;
	nm[rv] = '\0';
	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");
	}
	return rv;
}

#if 0
int sysfs_disk_to_sg(int fd)
{
	/* from an open block device, try find and open its corresponding
	 * scsi_generic interface
	 */
	struct stat st;
	char path[256];
	char sg_path[256];
	char sg_major_minor[8];
	char *c;
	DIR *dir;
	struct dirent *de;
	int major, minor, rv;

	if (fstat(fd, &st))
		return -1;

	snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device",
		 major(st.st_rdev), minor(st.st_rdev));

	dir = opendir(path);
	if (!dir)
		return -1;

	de = readdir(dir);
	while (de) {
		if (strncmp("scsi_generic:", de->d_name,
			    strlen("scsi_generic:")) == 0)
			break;
		de = readdir(dir);
	}
	closedir(dir);

	if (!de)
		return -1;

	snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name);
	fd = open(sg_path, O_RDONLY);
	if (fd < 0)
		return fd;

	rv = read(fd, sg_major_minor, sizeof(sg_major_minor));
	close(fd);
	if (rv < 0)
		return -1;
	else
		sg_major_minor[rv - 1] = '\0';

	c = strchr(sg_major_minor, ':');
	*c = '\0';
	c++;
	major = strtol(sg_major_minor, NULL, 10);
	minor = strtol(c, NULL, 10);
	snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d",
		 (int) getpid(), major, minor);
	if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) {
			fd = open(path, O_RDONLY);
			unlink(path);
			return fd;
	}

	return -1;
}
#endif

int sysfs_disk_to_scsi_id(int fd, __u32 *id)
{
	/* from an open block device, try to retrieve it scsi_id */
	struct stat st;
	char path[256];
	char *c1, *c2;
	DIR *dir;
	struct dirent *de;

	if (fstat(fd, &st))
		return 1;

	snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device",
		 major(st.st_rdev), minor(st.st_rdev));

	dir = opendir(path);
	if (!dir)
		return 1;

	de = readdir(dir);
	while (de) {
		if (strncmp("scsi_disk:", de->d_name,
			    strlen("scsi_disk:")) == 0)
			break;
		de = readdir(dir);
	}
	closedir(dir);

	if (!de)
		return 1;

	c1 = strchr(de->d_name, ':');
	c1++;
	c2 = strchr(c1, ':');
	*c2 = '\0';
	*id = strtol(c1, NULL, 10) << 24; /* host */
	c1 = c2 + 1;
	c2 = strchr(c1, ':');
	*c2 = '\0';
	*id |= strtol(c1, NULL, 10) << 16; /* channel */
	c1 = c2 + 1;
	c2 = strchr(c1, ':');
	*c2 = '\0';
	*id |= strtol(c1, NULL, 10) << 8; /* lun */
	c1 = c2 + 1;
	*id |= strtol(c1, NULL, 10); /* id */

	return 0;
}


int sysfs_unique_holder(int devnum, long rdev)
{
	/* Check that devnum is a holder of rdev,
	 * and is the only holder.
	 * we should be locked against races by
	 * an O_EXCL on devnum
	 */
	DIR *dir;
	struct dirent *de;
	char dirname[100];
	char l;
	int found = 0;
	sprintf(dirname, "/sys/dev/block/%d:%d/holders",
		major(rdev), minor(rdev));
	dir = opendir(dirname);
	errno = ENOENT;
	if (!dir)
		return 0;
	l = strlen(dirname);
	while ((de = readdir(dir)) != NULL) {
		char buf[10];
		int n;
		int mj, mn;
		char c;
		int fd;

		if (de->d_ino == 0)
			continue;
		if (de->d_name[0] == '.')
			continue;
		strcpy(dirname+l, "/");
		strcat(dirname+l, de->d_name);
		strcat(dirname+l, "/dev");
		fd = open(dirname, O_RDONLY);
		if (fd < 0) {
			errno = ENOENT;
			break;
		}
		n = read(fd, buf, sizeof(buf)-1);
		close(fd);
		buf[n] = 0;
		if (sscanf(buf, "%d:%d%c", &mj, &mn, &c) != 3 ||
		    c != '\n') {
			errno = ENOENT;
			break;
		}
		if (mj != MD_MAJOR)
			mn = -1-(mn>>6);

		if (devnum != mn) {
			errno = EEXIST;
			break;
		}
		found = 1;
	}
	closedir(dir);
	if (de)
		return 0;
	else
		return found;
}
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>
1770662b	28	#include <ctype.h>
e86c9dd6 NB	29
	30	int load_sys(char path, char buf)
	31	{
	32	int fd = open(path, O_RDONLY);
	33	int n;
	34	if (fd < 0)
	35	return -1;
	36	n = read(fd, buf, 1024);
	37	close(fd);
2f6079dc	38	if (n <0 \|\| n >= 1024)
e86c9dd6 NB	39	return -1;
e86c9dd6 NB	40	buf[n] = 0;
8dfb8619	41	if (n && buf[n-1] == '\n')
e86c9dd6 NB	42	buf[n-1] = 0;
	43	return 0;
	44	}
	45
7e0f6979	46	void sysfs_free(struct mdinfo *sra)
8382f19b	47	{
7e0f6979 NB	48	while (sra) {
	49	struct mdinfo *sra2 = sra->next;
	50	while (sra->devs) {
	51	struct mdinfo *d = sra->devs;
	52	sra->devs = d->next;
	53	free(d);
	54	}
	55	free(sra);
	56	sra = sra2;
8382f19b	57	}
8382f19b NB	58	}
8382f19b NB	59
549e9569 NB	60	int sysfs_open(int devnum, char devname, char attr)
	61	{
	62	char fname[50];
549e9569	63	int fd;
549e9569	64
77472ff8	65	sprintf(fname, "/sys/block/%s/md/", devnum2devname(devnum));
549e9569 NB	66	if (devname) {
	67	strcat(fname, devname);
	68	strcat(fname, "/");
	69	}
	70	strcat(fname, attr);
	71	fd = open(fname, O_RDWR);
ea6d09b0	72	if (fd < 0 && errno == EACCES)
549e9569 NB	73	fd = open(fname, O_RDONLY);
	74	return fd;
	75	}
	76
7e0f6979	77	struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options)
e86c9dd6 NB	78	{
	79	/* Longest possible name in sysfs, mounted at /sys, is
	80	* /sys/block/md_dXXX/md/dev-XXXXX/block/dev
	81	* /sys/block/md_dXXX/md/metadata_version
	82	* which is about 41 characters. 50 should do for now
	83	*/
	84	char fname[50];
	85	char buf[1024];
	86	char *base;
	87	char *dbase;
7e0f6979	88	struct mdinfo *sra;
06c7f68e	89	struct mdinfo *dev;
355726fa	90	DIR *dir = NULL;
e86c9dd6 NB	91	struct dirent *de;
	92
	93	sra = malloc(sizeof(*sra));
	94	if (sra == NULL)
	95	return sra;
7e0f6979	96	sra->next = NULL;
e86c9dd6 NB	97
	98	if (fd >= 0) {
	99	struct stat stb;
2faf1f5f NB	100	mdu_version_t vers;
	101	if (fstat(fd, &stb)) return NULL;
	102	if (ioctl(fd, RAID_VERSION, &vers) != 0)
	103	return NULL;
e86c9dd6	104	if (major(stb.st_rdev)==9)
ea24acd0	105	sprintf(sra->sys_name, "md%d", (int)minor(stb.st_rdev));
e86c9dd6	106	else
7e0f6979	107	sprintf(sra->sys_name, "md_d%d",
ea24acd0	108	(int)minor(stb.st_rdev)>>MdpMinorShift);
e86c9dd6 NB	109	} else {
e86c9dd6 NB	110	if (devnum >= 0)
7e0f6979	111	sprintf(sra->sys_name, "md%d", devnum);
e86c9dd6	112	else
7e0f6979	113	sprintf(sra->sys_name, "md_d%d",
e86c9dd6 NB	114	-1-devnum);
e86c9dd6 NB	115	}
7e0f6979	116	sprintf(fname, "/sys/block/%s/md/", sra->sys_name);
e86c9dd6 NB	117	base = fname + strlen(fname);
	118
	119	sra->devs = NULL;
8382f19b NB	120	if (options & GET_VERSION) {
	121	strcpy(base, "metadata_version");
	122	if (load_sys(fname, buf))
	123	goto abort;
294d6f45	124	if (strncmp(buf, "none", 4) == 0) {
7e0f6979 NB	125	sra->array.major_version =
7e0f6979 NB	126	sra->array.minor_version = -1;
294d6f45 NB	127	strcpy(sra->text_version, "");
294d6f45 NB	128	} else if (strncmp(buf, "external:", 9) == 0) {
142cb9e1 NB	129	sra->array.major_version = -1;
	130	sra->array.minor_version = -2;
	131	strcpy(sra->text_version, buf+9);
b8ac1967	132	} else {
8382f19b	133	sscanf(buf, "%d.%d",
7e0f6979 NB	134	&sra->array.major_version,
7e0f6979 NB	135	&sra->array.minor_version);
b8ac1967 NB	136	strcpy(sra->text_version, buf);
b8ac1967 NB	137	}
8382f19b	138	}
e86c9dd6 NB	139	if (options & GET_LEVEL) {
	140	strcpy(base, "level");
	141	if (load_sys(fname, buf))
	142	goto abort;
7e0f6979	143	sra->array.level = map_name(pers, buf);
e86c9dd6 NB	144	}
	145	if (options & GET_LAYOUT) {
	146	strcpy(base, "layout");
	147	if (load_sys(fname, buf))
	148	goto abort;
7e0f6979	149	sra->array.layout = strtoul(buf, NULL, 0);
e86c9dd6	150	}
549e9569 NB	151	if (options & GET_DISKS) {
	152	strcpy(base, "raid_disks");
	153	if (load_sys(fname, buf))
	154	goto abort;
	155	sra->array.raid_disks = strtoul(buf, NULL, 0);
f1d26766 DW	156	}
	157	if (options & GET_DEGRADED) {
	158	strcpy(base, "degraded");
	159	if (load_sys(fname, buf))
	160	goto abort;
	161	sra->array.failed_disks = strtoul(buf, NULL, 0);
549e9569	162	}
e86c9dd6 NB	163	if (options & GET_COMPONENT) {
	164	strcpy(base, "component_size");
	165	if (load_sys(fname, buf))
	166	goto abort;
	167	sra->component_size = strtoull(buf, NULL, 0);
353632d9 NB	168	/* sysfs reports "K", but we want sectors */
353632d9 NB	169	sra->component_size *= 2;
e86c9dd6 NB	170	}
	171	if (options & GET_CHUNK) {
	172	strcpy(base, "chunk_size");
	173	if (load_sys(fname, buf))
	174	goto abort;
7e0f6979	175	sra->array.chunk_size = strtoul(buf, NULL, 0);
e86c9dd6	176	}
758d3a8e NB	177	if (options & GET_CACHE) {
	178	strcpy(base, "stripe_cache_size");
	179	if (load_sys(fname, buf))
	180	goto abort;
	181	sra->cache_size = strtoul(buf, NULL, 0);
	182	}
37dfc3d6 NB	183	if (options & GET_MISMATCH) {
	184	strcpy(base, "mismatch_cnt");
	185	if (load_sys(fname, buf))
	186	goto abort;
	187	sra->mismatch_cnt = strtoul(buf, NULL, 0);
	188	}
1770662b DW	189	if (options & GET_SAFEMODE) {
	190	int scale = 1;
	191	int dot = 0;
	192	int i;
	193	unsigned long msec;
	194	size_t len;
	195
	196	strcpy(base, "safe_mode_delay");
	197	if (load_sys(fname, buf))
	198	goto abort;
	199
	200	/* remove a period, and count digits after it */
	201	len = strlen(buf);
	202	for (i = 0; i < len; i++) {
	203	if (dot) {
	204	if (isdigit(buf[i])) {
	205	buf[i-1] = buf[i];
	206	scale *= 10;
	207	}
	208	buf[i] = 0;
	209	} else if (buf[i] == '.') {
	210	dot=1;
	211	buf[i] = 0;
	212	}
	213	}
	214	msec = strtoul(buf, NULL, 10);
	215	msec = (msec * 1000) / scale;
	216	sra->safe_mode_delay = msec;
	217	}
e86c9dd6 NB	218
	219	if (! (options & GET_DEVS))
	220	return sra;
	221
	222	/* Get all the devices as well */
	223	*base = 0;
	224	dir = opendir(fname);
	225	if (!dir)
	226	goto abort;
7e0f6979	227	sra->array.spare_disks = 0;
e86c9dd6 NB	228
	229	while ((de = readdir(dir)) != NULL) {
	230	char *ep;
	231	if (de->d_ino == 0 \|\|
	232	strncmp(de->d_name, "dev-", 4) != 0)
	233	continue;
	234	strcpy(base, de->d_name);
	235	dbase = base + strlen(base);
	236	*dbase++ = '/';
	237
	238	dev = malloc(sizeof(*dev));
	239	if (!dev)
	240	goto abort;
e86c9dd6 NB	241
	242	/* Always get slot, major, minor */
	243	strcpy(dbase, "slot");
4795982e DW	244	if (load_sys(fname, buf)) {
	245	/* hmm... unable to read 'slot' maybe the device
	246	* is going away?
	247	*/
	248	strcpy(dbase, "block");
	249	if (readlink(fname, buf, sizeof(buf)) < 0 &&
	250	errno != ENAMETOOLONG) {
	251	/* ...yup device is gone */
	252	free(dev);
	253	continue;
	254	} else {
	255	/* slot is unreadable but 'block' link
	256	* still intact... something bad is happening
	257	* so abort
	258	*/
	259	free(dev);
	260	goto abort;
	261	}
	262
	263	}
	264	dev->next = sra->devs;
	265	sra->devs = dev;
	266
	267	strcpy(dev->sys_name, de->d_name);
06c7f68e NB	268	dev->disk.raid_disk = strtoul(buf, &ep, 10);
06c7f68e NB	269	if (*ep) dev->disk.raid_disk = -1;
e86c9dd6 NB	270
	271	strcpy(dbase, "block/dev");
	272	if (load_sys(fname, buf))
	273	goto abort;
06c7f68e	274	sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor);
e86c9dd6 NB	275
	276	if (options & GET_OFFSET) {
	277	strcpy(dbase, "offset");
	278	if (load_sys(fname, buf))
	279	goto abort;
06c7f68e	280	dev->data_offset = strtoull(buf, NULL, 0);
e86c9dd6 NB	281	}
	282	if (options & GET_SIZE) {
	283	strcpy(dbase, "size");
	284	if (load_sys(fname, buf))
	285	goto abort;
047d2e49	286	dev->component_size = strtoull(buf, NULL, 0) * 2;
e86c9dd6 NB	287	}
e86c9dd6 NB	288	if (options & GET_STATE) {
06c7f68e	289	dev->disk.state = 0;
e86c9dd6 NB	290	strcpy(dbase, "state");
	291	if (load_sys(fname, buf))
	292	goto abort;
	293	if (strstr(buf, "in_sync"))
06c7f68e	294	dev->disk.state \|= (1<<MD_DISK_SYNC);
e86c9dd6	295	if (strstr(buf, "faulty"))
06c7f68e NB	296	dev->disk.state \|= (1<<MD_DISK_FAULTY);
06c7f68e NB	297	if (dev->disk.state == 0)
7e0f6979	298	sra->array.spare_disks++;
e86c9dd6 NB	299	}
	300	if (options & GET_ERROR) {
	301	strcpy(buf, "errors");
	302	if (load_sys(fname, buf))
	303	goto abort;
	304	dev->errors = strtoul(buf, NULL, 0);
	305	}
	306	}
355726fa	307	closedir(dir);
e86c9dd6 NB	308	return sra;
	309
	310	abort:
355726fa NB	311	if (dir)
355726fa NB	312	closedir(dir);
8382f19b	313	sysfs_free(sra);
e86c9dd6 NB	314	return NULL;
	315	}
	316
1770662b DW	317	int sysfs_attr_match(const char attr, const char str)
	318	{
	319	/* See if attr, read from a sysfs file, matches
	320	* str. They must either be the same, or attr can
	321	* have a trailing newline or comma
	322	*/
	323	while (attr && str && attr == str) {
	324	attr++;
	325	str++;
	326	}
	327
	328	if (str \|\| (attr && attr != ',' && attr != '\n'))
	329	return 0;
	330	return 1;
	331	}
	332
	333	int sysfs_match_word(const char word, char *list)
	334	{
	335	int n;
	336	for (n=0; list[n]; n++)
	337	if (sysfs_attr_match(word, list[n]))
	338	break;
	339	return n;
	340	}
	341
e86c9dd6 NB	342	unsigned long long get_component_size(int fd)
	343	{
	344	/* Find out the component size of the array.
	345	* We cannot trust GET_ARRAY_INFO ioctl as it's
	346	* size field is only 32bits.
	347	* So look in /sys/block/mdXXX/md/component_size
353632d9	348	*
8686f3ed	349	* This returns in units of sectors.
e86c9dd6 NB	350	*/
	351	struct stat stb;
	352	char fname[50];
	353	int n;
	354	if (fstat(fd, &stb)) return 0;
	355	if (major(stb.st_rdev) == 9)
	356	sprintf(fname, "/sys/block/md%d/md/component_size",
ea24acd0	357	(int)minor(stb.st_rdev));
e86c9dd6 NB	358	else
e86c9dd6 NB	359	sprintf(fname, "/sys/block/md_d%d/md/component_size",
ea24acd0	360	(int)minor(stb.st_rdev)>>MdpMinorShift);
e86c9dd6 NB	361	fd = open(fname, O_RDONLY);
	362	if (fd < 0)
	363	return 0;
	364	n = read(fd, fname, sizeof(fname));
	365	close(fd);
	366	if (n == sizeof(fname))
	367	return 0;
	368	fname[n] = 0;
8686f3ed	369	return strtoull(fname, NULL, 10) * 2;
e86c9dd6 NB	370	}
e86c9dd6 NB	371
7e0f6979	372	int sysfs_set_str(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	373	char name, char val)
	374	{
	375	char fname[50];
	376	int n;
	377	int fd;
7e1432fb	378
e86c9dd6	379	sprintf(fname, "/sys/block/%s/md/%s/%s",
7e0f6979	380	sra->sys_name, dev?dev->sys_name:"", name);
e86c9dd6 NB	381	fd = open(fname, O_WRONLY);
	382	if (fd < 0)
	383	return -1;
	384	n = write(fd, val, strlen(val));
	385	close(fd);
	386	if (n != strlen(val))
	387	return -1;
	388	return 0;
	389	}
	390
7e0f6979	391	int sysfs_set_num(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	392	char *name, unsigned long long val)
	393	{
	394	char valstr[50];
	395	sprintf(valstr, "%llu", val);
	396	return sysfs_set_str(sra, dev, name, valstr);
	397	}
	398
7e0f6979	399	int sysfs_get_ll(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	400	char name, unsigned long long val)
	401	{
	402	char fname[50];
	403	char buf[50];
	404	int n;
	405	int fd;
	406	char *ep;
	407	sprintf(fname, "/sys/block/%s/md/%s/%s",
7e0f6979	408	sra->sys_name, dev?dev->sys_name:"", name);
e86c9dd6 NB	409	fd = open(fname, O_RDONLY);
	410	if (fd < 0)
	411	return -1;
	412	n = read(fd, buf, sizeof(buf));
	413	close(fd);
	414	if (n <= 0)
	415	return -1;
	416	buf[n] = 0;
	417	*val = strtoull(buf, &ep, 0);
	418	if (ep == buf \|\| (ep != 0 && ep != '\n' && *ep != ' '))
	419	return -1;
	420	return 0;
	421	}
2503d23b	422
8ed3e5e1 DW	423	int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms)
	424	{
	425	unsigned long sec;
	426	unsigned long msec;
	427	char delay[30];
	428
	429	sec = ms / 1000;
	430	msec = ms - (sec * 1000);
	431
	432	sprintf(delay, "%ld.%ld", sec, msec);
	433	return sysfs_set_str(sra, NULL, "safe_mode_delay", delay);
	434	}
	435
2503d23b NB	436	int sysfs_set_array(struct mdinfo *sra,
	437	struct mdinfo *info)
	438	{
	439	int rv = 0;
	440	sra->array = info->array;
2f6079dc	441
2503d23b NB	442	if (info->array.level < 0)
	443	return 0; /* FIXME */
	444	rv \|= sysfs_set_str(sra, NULL, "level",
	445	map_num(pers, info->array.level));
	446	rv \|= sysfs_set_num(sra, NULL, "raid_disks", info->array.raid_disks);
	447	rv \|= sysfs_set_num(sra, NULL, "chunk_size", info->array.chunk_size);
	448	rv \|= sysfs_set_num(sra, NULL, "layout", info->array.layout);
047d2e49	449	rv \|= sysfs_set_num(sra, NULL, "component_size", info->component_size/2);
0fd5c350	450	rv \|= sysfs_set_num(sra, NULL, "resync_start", info->resync_start);
2503d23b NB	451	sra->array = info->array;
	452	return rv;
	453	}
	454
2318b9f0	455	int sysfs_add_disk(struct mdinfo sra, struct mdinfo sd)
2503d23b NB	456	{
	457	char dv[100];
	458	char nm[100];
2503d23b NB	459	char *dname;
	460	int rv;
	461
	462	sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor);
	463	rv = sysfs_set_str(sra, NULL, "new_dev", dv);
	464	if (rv)
	465	return rv;
	466
	467	memset(nm, 0, sizeof(nm));
	468	sprintf(dv, "/sys/dev/block/%d:%d", sd->disk.major, sd->disk.minor);
73649188 N	469	rv = readlink(dv, nm, sizeof(nm));
73649188 N	470	if (rv <= 0)
2503d23b	471	return -1;
73649188	472	nm[rv] = '\0';
2503d23b NB	473	dname = strrchr(nm, '/');
	474	if (dname) dname++;
	475	strcpy(sd->sys_name, "dev-");
	476	strcpy(sd->sys_name+4, dname);
	477
73649188	478	rv = sysfs_set_num(sra, sd, "offset", sd->data_offset);
2503d23b NB	479	rv \|= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2);
	480	if (sra->array.level != LEVEL_CONTAINER) {
	481	rv \|= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk);
	482	// rv \|= sysfs_set_str(sra, sd, "state", "in_sync");
	483	}
2503d23b NB	484	return rv;
2503d23b NB	485	}
90c8b707	486
755c99fa	487	#if 0
90c8b707 DW	488	int sysfs_disk_to_sg(int fd)
	489	{
	490	/* from an open block device, try find and open its corresponding
	491	* scsi_generic interface
	492	*/
	493	struct stat st;
	494	char path[256];
	495	char sg_path[256];
	496	char sg_major_minor[8];
	497	char *c;
	498	DIR *dir;
	499	struct dirent *de;
	500	int major, minor, rv;
	501
	502	if (fstat(fd, &st))
	503	return -1;
	504
	505	snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device",
	506	major(st.st_rdev), minor(st.st_rdev));
	507
	508	dir = opendir(path);
	509	if (!dir)
	510	return -1;
	511
	512	de = readdir(dir);
	513	while (de) {
	514	if (strncmp("scsi_generic:", de->d_name,
	515	strlen("scsi_generic:")) == 0)
	516	break;
	517	de = readdir(dir);
	518	}
	519	closedir(dir);
	520
	521	if (!de)
	522	return -1;
	523
	524	snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name);
	525	fd = open(sg_path, O_RDONLY);
	526	if (fd < 0)
	527	return fd;
	528
	529	rv = read(fd, sg_major_minor, sizeof(sg_major_minor));
	530	close(fd);
	531	if (rv < 0)
	532	return -1;
	533	else
	534	sg_major_minor[rv - 1] = '\0';
	535
	536	c = strchr(sg_major_minor, ':');
	537	*c = '\0';
	538	c++;
	539	major = strtol(sg_major_minor, NULL, 10);
	540	minor = strtol(c, NULL, 10);
	541	snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d",
	542	(int) getpid(), major, minor);
	543	if (mknod(path, S_IFCHR\|0600, makedev(major, minor))==0) {
	544	fd = open(path, O_RDONLY);
	545	unlink(path);
	546	return fd;
	547	}
	548
	549	return -1;
	550	}
755c99fa	551	#endif
90c8b707	552
f1665f72 DW	553	int sysfs_disk_to_scsi_id(int fd, __u32 *id)
	554	{
	555	/* from an open block device, try to retrieve it scsi_id */
	556	struct stat st;
	557	char path[256];
	558	char c1, c2;
	559	DIR *dir;
	560	struct dirent *de;
	561
	562	if (fstat(fd, &st))
	563	return 1;
	564
	565	snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device",
	566	major(st.st_rdev), minor(st.st_rdev));
	567
	568	dir = opendir(path);
	569	if (!dir)
	570	return 1;
	571
	572	de = readdir(dir);
	573	while (de) {
	574	if (strncmp("scsi_disk:", de->d_name,
	575	strlen("scsi_disk:")) == 0)
	576	break;
	577	de = readdir(dir);
	578	}
	579	closedir(dir);
	580
	581	if (!de)
	582	return 1;
	583
	584	c1 = strchr(de->d_name, ':');
	585	c1++;
	586	c2 = strchr(c1, ':');
	587	*c2 = '\0';
	588	id = strtol(c1, NULL, 10) << 24; / host */
	589	c1 = c2 + 1;
	590	c2 = strchr(c1, ':');
	591	*c2 = '\0';
	592	id \|= strtol(c1, NULL, 10) << 16; / channel */
	593	c1 = c2 + 1;
	594	c2 = strchr(c1, ':');
	595	*c2 = '\0';
	596	id \|= strtol(c1, NULL, 10) << 8; / lun */
	597	c1 = c2 + 1;
	598	id \|= strtol(c1, NULL, 10); / id */
	599
	600	return 0;
	601	}
f94d52f4 NB	602
	603
	604	int sysfs_unique_holder(int devnum, long rdev)
	605	{
	606	/* Check that devnum is a holder of rdev,
	607	* and is the only holder.
	608	* we should be locked against races by
	609	* an O_EXCL on devnum
	610	*/
	611	DIR *dir;
	612	struct dirent *de;
	613	char dirname[100];
	614	char l;
	615	int found = 0;
	616	sprintf(dirname, "/sys/dev/block/%d:%d/holders",
	617	major(rdev), minor(rdev));
	618	dir = opendir(dirname);
	619	errno = ENOENT;
	620	if (!dir)
	621	return 0;
	622	l = strlen(dirname);
	623	while ((de = readdir(dir)) != NULL) {
	624	char buf[10];
	625	int n;
	626	int mj, mn;
	627	char c;
	628	int fd;
	629
	630	if (de->d_ino == 0)
	631	continue;
	632	if (de->d_name[0] == '.')
	633	continue;
	634	strcpy(dirname+l, "/");
	635	strcat(dirname+l, de->d_name);
	636	strcat(dirname+l, "/dev");
	637	fd = open(dirname, O_RDONLY);
	638	if (fd < 0) {
	639	errno = ENOENT;
	640	break;
	641	}
	642	n = read(fd, buf, sizeof(buf)-1);
	643	close(fd);
	644	buf[n] = 0;
	645	if (sscanf(buf, "%d:%d%c", &mj, &mn, &c) != 3 \|\|
	646	c != '\n') {
	647	errno = ENOENT;
	648	break;
	649	}
	650	if (mj != MD_MAJOR)
	651	mn = -1-(mn>>6);
	652
	653	if (devnum != mn) {
	654	errno = EEXIST;
	655	break;
	656	}
	657	found = 1;
	658	}
	659	closedir(dir);
	660	if (de)
	661	return 0;
	662	else
	663	return found;
	664	}