[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;
	char *mdname = devnum2devname(devnum);

	if (!mdname)
		return -1;

	sprintf(fname, "/sys/block/%s/md/", mdname);
	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);
	free(mdname);
	return fd;
}

void sysfs_init(struct mdinfo *mdi, int fd, int devnum)
{
	if (fd >= 0) {
		struct stat stb;
		mdu_version_t vers;
 		if (fstat(fd, &stb))
			return;
		if (ioctl(fd, RAID_VERSION, &vers) != 0)
			return;
		if (major(stb.st_rdev)==9)
			sprintf(mdi->sys_name, "md%d", (int)minor(stb.st_rdev));
		else
			sprintf(mdi->sys_name, "md_d%d",
				(int)minor(stb.st_rdev)>>MdpMinorShift);
	} else {
		if (devnum >= 0)
			sprintf(mdi->sys_name, "md%d", devnum);
		else
			sprintf(mdi->sys_name, "md_d%d",
				-1-devnum);
	}
}

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;
	memset(sra, 0, sizeof(*sra));
	sysfs_init(sra, fd, 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)) {
		dprintf(Name ": failed to write '%s' to '%s' (%s)\n",
			val, fname, strerror(errno));
		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 % 1000;

	sprintf(delay, "%ld.%03ld\n", sec, msec);
	/*             this '\n' ^ needed for kernels older than 2.6.28 */
	return sysfs_set_str(sra, NULL, "safe_mode_delay", delay);
}

int sysfs_set_array(struct mdinfo *info, int vers)
{
	int rv = 0;
	char ver[100];

	ver[0] = 0;
	if (info->array.major_version == -1 &&
	    info->array.minor_version == -2) {
		strcat(strcpy(ver, "external:"), info->text_version);

		if ((vers % 100) < 2 ||
		    sysfs_set_str(info, NULL, "metadata_version",
				  ver) < 0) {
			fprintf(stderr, Name ": This kernel does not "
				"support external metadata.\n");
			return 1;
		}
	}
	if (info->array.level < 0)
		return 0; /* FIXME */
	rv |= sysfs_set_str(info, NULL, "level",
			    map_num(pers, info->array.level));
	rv |= sysfs_set_num(info, NULL, "raid_disks", info->array.raid_disks);
	rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size);
	rv |= sysfs_set_num(info, NULL, "layout", info->array.layout);
	rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2);
	if (info->array.level > 0)
		rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start);
	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;
1e4bc070	64	char *mdname = devnum2devname(devnum);
549e9569	65
1e4bc070 DW	66	if (!mdname)
	67	return -1;
	68
	69	sprintf(fname, "/sys/block/%s/md/", mdname);
549e9569 NB	70	if (devname) {
	71	strcat(fname, devname);
	72	strcat(fname, "/");
	73	}
	74	strcat(fname, attr);
	75	fd = open(fname, O_RDWR);
ea6d09b0	76	if (fd < 0 && errno == EACCES)
549e9569	77	fd = open(fname, O_RDONLY);
1e4bc070	78	free(mdname);
549e9569 NB	79	return fd;
	80	}
	81
f35f2525 N	82	void sysfs_init(struct mdinfo *mdi, int fd, int devnum)
	83	{
	84	if (fd >= 0) {
	85	struct stat stb;
	86	mdu_version_t vers;
	87	if (fstat(fd, &stb))
	88	return;
	89	if (ioctl(fd, RAID_VERSION, &vers) != 0)
	90	return;
	91	if (major(stb.st_rdev)==9)
	92	sprintf(mdi->sys_name, "md%d", (int)minor(stb.st_rdev));
	93	else
	94	sprintf(mdi->sys_name, "md_d%d",
	95	(int)minor(stb.st_rdev)>>MdpMinorShift);
	96	} else {
	97	if (devnum >= 0)
	98	sprintf(mdi->sys_name, "md%d", devnum);
	99	else
	100	sprintf(mdi->sys_name, "md_d%d",
	101	-1-devnum);
	102	}
	103	}
	104
7e0f6979	105	struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options)
e86c9dd6 NB	106	{
	107	/* Longest possible name in sysfs, mounted at /sys, is
	108	* /sys/block/md_dXXX/md/dev-XXXXX/block/dev
	109	* /sys/block/md_dXXX/md/metadata_version
	110	* which is about 41 characters. 50 should do for now
	111	*/
	112	char fname[50];
	113	char buf[1024];
	114	char *base;
	115	char *dbase;
7e0f6979	116	struct mdinfo *sra;
06c7f68e	117	struct mdinfo *dev;
355726fa	118	DIR *dir = NULL;
e86c9dd6 NB	119	struct dirent *de;
	120
	121	sra = malloc(sizeof(*sra));
	122	if (sra == NULL)
	123	return sra;
f35f2525 N	124	memset(sra, 0, sizeof(*sra));
f35f2525 N	125	sysfs_init(sra, fd, devnum);
e86c9dd6	126
7e0f6979	127	sprintf(fname, "/sys/block/%s/md/", sra->sys_name);
e86c9dd6 NB	128	base = fname + strlen(fname);
	129
	130	sra->devs = NULL;
8382f19b NB	131	if (options & GET_VERSION) {
	132	strcpy(base, "metadata_version");
	133	if (load_sys(fname, buf))
	134	goto abort;
294d6f45	135	if (strncmp(buf, "none", 4) == 0) {
7e0f6979 NB	136	sra->array.major_version =
7e0f6979 NB	137	sra->array.minor_version = -1;
294d6f45 NB	138	strcpy(sra->text_version, "");
294d6f45 NB	139	} else if (strncmp(buf, "external:", 9) == 0) {
142cb9e1 NB	140	sra->array.major_version = -1;
	141	sra->array.minor_version = -2;
	142	strcpy(sra->text_version, buf+9);
b8ac1967	143	} else {
8382f19b	144	sscanf(buf, "%d.%d",
7e0f6979 NB	145	&sra->array.major_version,
7e0f6979 NB	146	&sra->array.minor_version);
b8ac1967 NB	147	strcpy(sra->text_version, buf);
b8ac1967 NB	148	}
8382f19b	149	}
e86c9dd6 NB	150	if (options & GET_LEVEL) {
	151	strcpy(base, "level");
	152	if (load_sys(fname, buf))
	153	goto abort;
7e0f6979	154	sra->array.level = map_name(pers, buf);
e86c9dd6 NB	155	}
	156	if (options & GET_LAYOUT) {
	157	strcpy(base, "layout");
	158	if (load_sys(fname, buf))
	159	goto abort;
7e0f6979	160	sra->array.layout = strtoul(buf, NULL, 0);
e86c9dd6	161	}
549e9569 NB	162	if (options & GET_DISKS) {
	163	strcpy(base, "raid_disks");
	164	if (load_sys(fname, buf))
	165	goto abort;
	166	sra->array.raid_disks = strtoul(buf, NULL, 0);
f1d26766 DW	167	}
	168	if (options & GET_DEGRADED) {
	169	strcpy(base, "degraded");
	170	if (load_sys(fname, buf))
	171	goto abort;
	172	sra->array.failed_disks = strtoul(buf, NULL, 0);
549e9569	173	}
e86c9dd6 NB	174	if (options & GET_COMPONENT) {
	175	strcpy(base, "component_size");
	176	if (load_sys(fname, buf))
	177	goto abort;
	178	sra->component_size = strtoull(buf, NULL, 0);
353632d9 NB	179	/* sysfs reports "K", but we want sectors */
353632d9 NB	180	sra->component_size *= 2;
e86c9dd6 NB	181	}
	182	if (options & GET_CHUNK) {
	183	strcpy(base, "chunk_size");
	184	if (load_sys(fname, buf))
	185	goto abort;
7e0f6979	186	sra->array.chunk_size = strtoul(buf, NULL, 0);
e86c9dd6	187	}
758d3a8e NB	188	if (options & GET_CACHE) {
	189	strcpy(base, "stripe_cache_size");
	190	if (load_sys(fname, buf))
	191	goto abort;
	192	sra->cache_size = strtoul(buf, NULL, 0);
	193	}
37dfc3d6 NB	194	if (options & GET_MISMATCH) {
	195	strcpy(base, "mismatch_cnt");
	196	if (load_sys(fname, buf))
	197	goto abort;
	198	sra->mismatch_cnt = strtoul(buf, NULL, 0);
	199	}
1770662b DW	200	if (options & GET_SAFEMODE) {
	201	int scale = 1;
	202	int dot = 0;
	203	int i;
	204	unsigned long msec;
	205	size_t len;
	206
	207	strcpy(base, "safe_mode_delay");
	208	if (load_sys(fname, buf))
	209	goto abort;
	210
	211	/* remove a period, and count digits after it */
	212	len = strlen(buf);
	213	for (i = 0; i < len; i++) {
	214	if (dot) {
	215	if (isdigit(buf[i])) {
	216	buf[i-1] = buf[i];
	217	scale *= 10;
	218	}
	219	buf[i] = 0;
	220	} else if (buf[i] == '.') {
	221	dot=1;
	222	buf[i] = 0;
	223	}
	224	}
	225	msec = strtoul(buf, NULL, 10);
	226	msec = (msec * 1000) / scale;
	227	sra->safe_mode_delay = msec;
	228	}
e86c9dd6 NB	229
	230	if (! (options & GET_DEVS))
	231	return sra;
	232
	233	/* Get all the devices as well */
	234	*base = 0;
	235	dir = opendir(fname);
	236	if (!dir)
	237	goto abort;
7e0f6979	238	sra->array.spare_disks = 0;
e86c9dd6 NB	239
	240	while ((de = readdir(dir)) != NULL) {
	241	char *ep;
	242	if (de->d_ino == 0 \|\|
	243	strncmp(de->d_name, "dev-", 4) != 0)
	244	continue;
	245	strcpy(base, de->d_name);
	246	dbase = base + strlen(base);
	247	*dbase++ = '/';
	248
	249	dev = malloc(sizeof(*dev));
	250	if (!dev)
	251	goto abort;
e86c9dd6 NB	252
	253	/* Always get slot, major, minor */
	254	strcpy(dbase, "slot");
4795982e DW	255	if (load_sys(fname, buf)) {
	256	/* hmm... unable to read 'slot' maybe the device
	257	* is going away?
	258	*/
	259	strcpy(dbase, "block");
	260	if (readlink(fname, buf, sizeof(buf)) < 0 &&
	261	errno != ENAMETOOLONG) {
	262	/* ...yup device is gone */
	263	free(dev);
	264	continue;
	265	} else {
	266	/* slot is unreadable but 'block' link
	267	* still intact... something bad is happening
	268	* so abort
	269	*/
	270	free(dev);
	271	goto abort;
	272	}
	273
	274	}
	275	dev->next = sra->devs;
	276	sra->devs = dev;
	277
	278	strcpy(dev->sys_name, de->d_name);
06c7f68e NB	279	dev->disk.raid_disk = strtoul(buf, &ep, 10);
06c7f68e NB	280	if (*ep) dev->disk.raid_disk = -1;
e86c9dd6 NB	281
	282	strcpy(dbase, "block/dev");
	283	if (load_sys(fname, buf))
	284	goto abort;
06c7f68e	285	sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor);
e86c9dd6 NB	286
	287	if (options & GET_OFFSET) {
	288	strcpy(dbase, "offset");
	289	if (load_sys(fname, buf))
	290	goto abort;
06c7f68e	291	dev->data_offset = strtoull(buf, NULL, 0);
e86c9dd6 NB	292	}
	293	if (options & GET_SIZE) {
	294	strcpy(dbase, "size");
	295	if (load_sys(fname, buf))
	296	goto abort;
047d2e49	297	dev->component_size = strtoull(buf, NULL, 0) * 2;
e86c9dd6 NB	298	}
e86c9dd6 NB	299	if (options & GET_STATE) {
06c7f68e	300	dev->disk.state = 0;
e86c9dd6 NB	301	strcpy(dbase, "state");
	302	if (load_sys(fname, buf))
	303	goto abort;
	304	if (strstr(buf, "in_sync"))
06c7f68e	305	dev->disk.state \|= (1<<MD_DISK_SYNC);
e86c9dd6	306	if (strstr(buf, "faulty"))
06c7f68e NB	307	dev->disk.state \|= (1<<MD_DISK_FAULTY);
06c7f68e NB	308	if (dev->disk.state == 0)
7e0f6979	309	sra->array.spare_disks++;
e86c9dd6 NB	310	}
	311	if (options & GET_ERROR) {
	312	strcpy(buf, "errors");
	313	if (load_sys(fname, buf))
	314	goto abort;
	315	dev->errors = strtoul(buf, NULL, 0);
	316	}
	317	}
355726fa	318	closedir(dir);
e86c9dd6 NB	319	return sra;
	320
	321	abort:
355726fa NB	322	if (dir)
355726fa NB	323	closedir(dir);
8382f19b	324	sysfs_free(sra);
e86c9dd6 NB	325	return NULL;
	326	}
	327
1770662b DW	328	int sysfs_attr_match(const char attr, const char str)
	329	{
	330	/* See if attr, read from a sysfs file, matches
	331	* str. They must either be the same, or attr can
	332	* have a trailing newline or comma
	333	*/
	334	while (attr && str && attr == str) {
	335	attr++;
	336	str++;
	337	}
	338
	339	if (str \|\| (attr && attr != ',' && attr != '\n'))
	340	return 0;
	341	return 1;
	342	}
	343
	344	int sysfs_match_word(const char word, char *list)
	345	{
	346	int n;
	347	for (n=0; list[n]; n++)
	348	if (sysfs_attr_match(word, list[n]))
	349	break;
	350	return n;
	351	}
	352
e86c9dd6 NB	353	unsigned long long get_component_size(int fd)
	354	{
	355	/* Find out the component size of the array.
	356	* We cannot trust GET_ARRAY_INFO ioctl as it's
	357	* size field is only 32bits.
	358	* So look in /sys/block/mdXXX/md/component_size
353632d9	359	*
8686f3ed	360	* This returns in units of sectors.
e86c9dd6 NB	361	*/
	362	struct stat stb;
	363	char fname[50];
	364	int n;
	365	if (fstat(fd, &stb)) return 0;
	366	if (major(stb.st_rdev) == 9)
	367	sprintf(fname, "/sys/block/md%d/md/component_size",
ea24acd0	368	(int)minor(stb.st_rdev));
e86c9dd6 NB	369	else
e86c9dd6 NB	370	sprintf(fname, "/sys/block/md_d%d/md/component_size",
ea24acd0	371	(int)minor(stb.st_rdev)>>MdpMinorShift);
e86c9dd6 NB	372	fd = open(fname, O_RDONLY);
	373	if (fd < 0)
	374	return 0;
	375	n = read(fd, fname, sizeof(fname));
	376	close(fd);
	377	if (n == sizeof(fname))
	378	return 0;
	379	fname[n] = 0;
8686f3ed	380	return strtoull(fname, NULL, 10) * 2;
e86c9dd6 NB	381	}
e86c9dd6 NB	382
7e0f6979	383	int sysfs_set_str(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	384	char name, char val)
	385	{
	386	char fname[50];
	387	int n;
	388	int fd;
7e1432fb	389
e86c9dd6	390	sprintf(fname, "/sys/block/%s/md/%s/%s",
7e0f6979	391	sra->sys_name, dev?dev->sys_name:"", name);
e86c9dd6 NB	392	fd = open(fname, O_WRONLY);
	393	if (fd < 0)
	394	return -1;
	395	n = write(fd, val, strlen(val));
	396	close(fd);
2a24d7b6 DW	397	if (n != strlen(val)) {
	398	dprintf(Name ": failed to write '%s' to '%s' (%s)\n",
	399	val, fname, strerror(errno));
e86c9dd6	400	return -1;
2a24d7b6	401	}
e86c9dd6 NB	402	return 0;
	403	}
	404
7e0f6979	405	int sysfs_set_num(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	406	char *name, unsigned long long val)
	407	{
	408	char valstr[50];
	409	sprintf(valstr, "%llu", val);
	410	return sysfs_set_str(sra, dev, name, valstr);
	411	}
	412
7e0f6979	413	int sysfs_get_ll(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	414	char name, unsigned long long val)
	415	{
	416	char fname[50];
	417	char buf[50];
	418	int n;
	419	int fd;
	420	char *ep;
	421	sprintf(fname, "/sys/block/%s/md/%s/%s",
7e0f6979	422	sra->sys_name, dev?dev->sys_name:"", name);
e86c9dd6 NB	423	fd = open(fname, O_RDONLY);
	424	if (fd < 0)
	425	return -1;
	426	n = read(fd, buf, sizeof(buf));
	427	close(fd);
	428	if (n <= 0)
	429	return -1;
	430	buf[n] = 0;
	431	*val = strtoull(buf, &ep, 0);
	432	if (ep == buf \|\| (ep != 0 && ep != '\n' && *ep != ' '))
	433	return -1;
	434	return 0;
	435	}
2503d23b	436
8ed3e5e1 DW	437	int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms)
	438	{
	439	unsigned long sec;
	440	unsigned long msec;
	441	char delay[30];
	442
	443	sec = ms / 1000;
0dd3ba30	444	msec = ms % 1000;
8ed3e5e1	445
0dd3ba30 DW	446	sprintf(delay, "%ld.%03ld\n", sec, msec);
0dd3ba30 DW	447	/* this '\n' ^ needed for kernels older than 2.6.28 */
8ed3e5e1 DW	448	return sysfs_set_str(sra, NULL, "safe_mode_delay", delay);
	449	}
	450
f35f2525	451	int sysfs_set_array(struct mdinfo *info, int vers)
2503d23b NB	452	{
2503d23b NB	453	int rv = 0;
f35f2525 N	454	char ver[100];
	455
	456	ver[0] = 0;
	457	if (info->array.major_version == -1 &&
	458	info->array.minor_version == -2) {
	459	strcat(strcpy(ver, "external:"), info->text_version);
	460
	461	if ((vers % 100) < 2 \|\|
	462	sysfs_set_str(info, NULL, "metadata_version",
	463	ver) < 0) {
	464	fprintf(stderr, Name ": This kernel does not "
	465	"support external metadata.\n");
	466	return 1;
	467	}
	468	}
2503d23b NB	469	if (info->array.level < 0)
2503d23b NB	470	return 0; /* FIXME */
f35f2525	471	rv \|= sysfs_set_str(info, NULL, "level",
2503d23b	472	map_num(pers, info->array.level));
f35f2525 N	473	rv \|= sysfs_set_num(info, NULL, "raid_disks", info->array.raid_disks);
	474	rv \|= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size);
	475	rv \|= sysfs_set_num(info, NULL, "layout", info->array.layout);
	476	rv \|= sysfs_set_num(info, NULL, "component_size", info->component_size/2);
	477	if (info->array.level > 0)
	478	rv \|= sysfs_set_num(info, NULL, "resync_start", info->resync_start);
2503d23b NB	479	return rv;
	480	}
	481
2318b9f0	482	int sysfs_add_disk(struct mdinfo sra, struct mdinfo sd)
2503d23b NB	483	{
	484	char dv[100];
	485	char nm[100];
2503d23b NB	486	char *dname;
	487	int rv;
	488
	489	sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor);
	490	rv = sysfs_set_str(sra, NULL, "new_dev", dv);
	491	if (rv)
	492	return rv;
	493
	494	memset(nm, 0, sizeof(nm));
	495	sprintf(dv, "/sys/dev/block/%d:%d", sd->disk.major, sd->disk.minor);
73649188 N	496	rv = readlink(dv, nm, sizeof(nm));
73649188 N	497	if (rv <= 0)
2503d23b	498	return -1;
73649188	499	nm[rv] = '\0';
2503d23b NB	500	dname = strrchr(nm, '/');
	501	if (dname) dname++;
	502	strcpy(sd->sys_name, "dev-");
	503	strcpy(sd->sys_name+4, dname);
	504
73649188	505	rv = sysfs_set_num(sra, sd, "offset", sd->data_offset);
2503d23b NB	506	rv \|= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2);
	507	if (sra->array.level != LEVEL_CONTAINER) {
	508	rv \|= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk);
	509	// rv \|= sysfs_set_str(sra, sd, "state", "in_sync");
	510	}
2503d23b NB	511	return rv;
2503d23b NB	512	}
90c8b707	513
755c99fa	514	#if 0
90c8b707 DW	515	int sysfs_disk_to_sg(int fd)
	516	{
	517	/* from an open block device, try find and open its corresponding
	518	* scsi_generic interface
	519	*/
	520	struct stat st;
	521	char path[256];
	522	char sg_path[256];
	523	char sg_major_minor[8];
	524	char *c;
	525	DIR *dir;
	526	struct dirent *de;
	527	int major, minor, rv;
	528
	529	if (fstat(fd, &st))
	530	return -1;
	531
	532	snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device",
	533	major(st.st_rdev), minor(st.st_rdev));
	534
	535	dir = opendir(path);
	536	if (!dir)
	537	return -1;
	538
	539	de = readdir(dir);
	540	while (de) {
	541	if (strncmp("scsi_generic:", de->d_name,
	542	strlen("scsi_generic:")) == 0)
	543	break;
	544	de = readdir(dir);
	545	}
	546	closedir(dir);
	547
	548	if (!de)
	549	return -1;
	550
	551	snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name);
	552	fd = open(sg_path, O_RDONLY);
	553	if (fd < 0)
	554	return fd;
	555
	556	rv = read(fd, sg_major_minor, sizeof(sg_major_minor));
	557	close(fd);
	558	if (rv < 0)
	559	return -1;
	560	else
	561	sg_major_minor[rv - 1] = '\0';
	562
	563	c = strchr(sg_major_minor, ':');
	564	*c = '\0';
	565	c++;
	566	major = strtol(sg_major_minor, NULL, 10);
	567	minor = strtol(c, NULL, 10);
	568	snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d",
	569	(int) getpid(), major, minor);
	570	if (mknod(path, S_IFCHR\|0600, makedev(major, minor))==0) {
	571	fd = open(path, O_RDONLY);
	572	unlink(path);
	573	return fd;
	574	}
	575
	576	return -1;
	577	}
755c99fa	578	#endif
90c8b707	579
f1665f72 DW	580	int sysfs_disk_to_scsi_id(int fd, __u32 *id)
	581	{
	582	/* from an open block device, try to retrieve it scsi_id */
	583	struct stat st;
	584	char path[256];
	585	char c1, c2;
	586	DIR *dir;
	587	struct dirent *de;
	588
	589	if (fstat(fd, &st))
	590	return 1;
	591
	592	snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device",
	593	major(st.st_rdev), minor(st.st_rdev));
	594
	595	dir = opendir(path);
	596	if (!dir)
	597	return 1;
	598
	599	de = readdir(dir);
	600	while (de) {
	601	if (strncmp("scsi_disk:", de->d_name,
	602	strlen("scsi_disk:")) == 0)
	603	break;
	604	de = readdir(dir);
	605	}
	606	closedir(dir);
	607
	608	if (!de)
	609	return 1;
	610
	611	c1 = strchr(de->d_name, ':');
	612	c1++;
	613	c2 = strchr(c1, ':');
	614	*c2 = '\0';
	615	id = strtol(c1, NULL, 10) << 24; / host */
	616	c1 = c2 + 1;
	617	c2 = strchr(c1, ':');
	618	*c2 = '\0';
	619	id \|= strtol(c1, NULL, 10) << 16; / channel */
	620	c1 = c2 + 1;
	621	c2 = strchr(c1, ':');
	622	*c2 = '\0';
	623	id \|= strtol(c1, NULL, 10) << 8; / lun */
	624	c1 = c2 + 1;
	625	id \|= strtol(c1, NULL, 10); / id */
	626
	627	return 0;
	628	}
f94d52f4 NB	629
	630
	631	int sysfs_unique_holder(int devnum, long rdev)
	632	{
	633	/* Check that devnum is a holder of rdev,
	634	* and is the only holder.
	635	* we should be locked against races by
	636	* an O_EXCL on devnum
	637	*/
	638	DIR *dir;
	639	struct dirent *de;
	640	char dirname[100];
	641	char l;
	642	int found = 0;
	643	sprintf(dirname, "/sys/dev/block/%d:%d/holders",
	644	major(rdev), minor(rdev));
	645	dir = opendir(dirname);
	646	errno = ENOENT;
	647	if (!dir)
	648	return 0;
	649	l = strlen(dirname);
	650	while ((de = readdir(dir)) != NULL) {
	651	char buf[10];
	652	int n;
	653	int mj, mn;
	654	char c;
	655	int fd;
	656
	657	if (de->d_ino == 0)
	658	continue;
	659	if (de->d_name[0] == '.')
	660	continue;
	661	strcpy(dirname+l, "/");
	662	strcat(dirname+l, de->d_name);
	663	strcat(dirname+l, "/dev");
	664	fd = open(dirname, O_RDONLY);
	665	if (fd < 0) {
	666	errno = ENOENT;
	667	break;
	668	}
	669	n = read(fd, buf, sizeof(buf)-1);
	670	close(fd);
	671	buf[n] = 0;
	672	if (sscanf(buf, "%d:%d%c", &mj, &mn, &c) != 3 \|\|
	673	c != '\n') {
	674	errno = ENOENT;
	675	break;
	676	}
	677	if (mj != MD_MAJOR)
	678	mn = -1-(mn>>6);
	679
	680	if (devnum != mn) {
	681	errno = EEXIST;
	682	break;
	683	}
	684	found = 1;
	685	}
	686	closedir(dir);
	687	if (de)
	688	return 0;
	689	else
	690	return found;
	691	}