[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) {
		mdu_version_t vers;
		if (ioctl(fd, RAID_VERSION, &vers) != 0)
			return;
		devnum = fd2devnum(fd);
	}
	if (devnum == NoMdDev)
		return;
	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) != get_mdp_major())
		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_uevent(struct mdinfo *sra, char *event)
{
	char fname[50];
	int n;
	int fd;

	sprintf(fname, "/sys/block/%s/uevent",
		sra->sys_name);
	fd = open(fname, O_WRONLY);
	if (fd < 0)
		return -1;
	n = write(fd, event, strlen(event));
	close(fd);
	return 0;
}	

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) {
f35f2525	85	mdu_version_t vers;
f35f2525 N	86	if (ioctl(fd, RAID_VERSION, &vers) != 0)
f35f2525 N	87	return;
d7ab966b	88	devnum = fd2devnum(fd);
f35f2525	89	}
d7ab966b N	90	if (devnum == NoMdDev)
	91	return;
	92	if (devnum >= 0)
	93	sprintf(mdi->sys_name, "md%d", devnum);
	94	else
	95	sprintf(mdi->sys_name, "md_d%d",
	96	-1-devnum);
f35f2525 N	97	}
f35f2525 N	98
d7ab966b	99
7e0f6979	100	struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options)
e86c9dd6 NB	101	{
	102	/* Longest possible name in sysfs, mounted at /sys, is
	103	* /sys/block/md_dXXX/md/dev-XXXXX/block/dev
	104	* /sys/block/md_dXXX/md/metadata_version
	105	* which is about 41 characters. 50 should do for now
	106	*/
	107	char fname[50];
	108	char buf[1024];
	109	char *base;
	110	char *dbase;
7e0f6979	111	struct mdinfo *sra;
06c7f68e	112	struct mdinfo *dev;
355726fa	113	DIR *dir = NULL;
e86c9dd6 NB	114	struct dirent *de;
	115
	116	sra = malloc(sizeof(*sra));
	117	if (sra == NULL)
	118	return sra;
f35f2525 N	119	memset(sra, 0, sizeof(*sra));
f35f2525 N	120	sysfs_init(sra, fd, devnum);
e86c9dd6	121
7e0f6979	122	sprintf(fname, "/sys/block/%s/md/", sra->sys_name);
e86c9dd6 NB	123	base = fname + strlen(fname);
	124
	125	sra->devs = NULL;
8382f19b NB	126	if (options & GET_VERSION) {
	127	strcpy(base, "metadata_version");
	128	if (load_sys(fname, buf))
	129	goto abort;
294d6f45	130	if (strncmp(buf, "none", 4) == 0) {
7e0f6979 NB	131	sra->array.major_version =
7e0f6979 NB	132	sra->array.minor_version = -1;
294d6f45 NB	133	strcpy(sra->text_version, "");
294d6f45 NB	134	} else if (strncmp(buf, "external:", 9) == 0) {
142cb9e1 NB	135	sra->array.major_version = -1;
	136	sra->array.minor_version = -2;
	137	strcpy(sra->text_version, buf+9);
b8ac1967	138	} else {
8382f19b	139	sscanf(buf, "%d.%d",
7e0f6979 NB	140	&sra->array.major_version,
7e0f6979 NB	141	&sra->array.minor_version);
b8ac1967 NB	142	strcpy(sra->text_version, buf);
b8ac1967 NB	143	}
8382f19b	144	}
e86c9dd6 NB	145	if (options & GET_LEVEL) {
	146	strcpy(base, "level");
	147	if (load_sys(fname, buf))
	148	goto abort;
7e0f6979	149	sra->array.level = map_name(pers, buf);
e86c9dd6 NB	150	}
	151	if (options & GET_LAYOUT) {
	152	strcpy(base, "layout");
	153	if (load_sys(fname, buf))
	154	goto abort;
7e0f6979	155	sra->array.layout = strtoul(buf, NULL, 0);
e86c9dd6	156	}
549e9569 NB	157	if (options & GET_DISKS) {
	158	strcpy(base, "raid_disks");
	159	if (load_sys(fname, buf))
	160	goto abort;
	161	sra->array.raid_disks = strtoul(buf, NULL, 0);
f1d26766 DW	162	}
	163	if (options & GET_DEGRADED) {
	164	strcpy(base, "degraded");
	165	if (load_sys(fname, buf))
	166	goto abort;
	167	sra->array.failed_disks = strtoul(buf, NULL, 0);
549e9569	168	}
e86c9dd6 NB	169	if (options & GET_COMPONENT) {
	170	strcpy(base, "component_size");
	171	if (load_sys(fname, buf))
	172	goto abort;
	173	sra->component_size = strtoull(buf, NULL, 0);
353632d9 NB	174	/* sysfs reports "K", but we want sectors */
353632d9 NB	175	sra->component_size *= 2;
e86c9dd6 NB	176	}
	177	if (options & GET_CHUNK) {
	178	strcpy(base, "chunk_size");
	179	if (load_sys(fname, buf))
	180	goto abort;
7e0f6979	181	sra->array.chunk_size = strtoul(buf, NULL, 0);
e86c9dd6	182	}
758d3a8e NB	183	if (options & GET_CACHE) {
	184	strcpy(base, "stripe_cache_size");
	185	if (load_sys(fname, buf))
	186	goto abort;
	187	sra->cache_size = strtoul(buf, NULL, 0);
	188	}
37dfc3d6 NB	189	if (options & GET_MISMATCH) {
	190	strcpy(base, "mismatch_cnt");
	191	if (load_sys(fname, buf))
	192	goto abort;
	193	sra->mismatch_cnt = strtoul(buf, NULL, 0);
	194	}
1770662b DW	195	if (options & GET_SAFEMODE) {
	196	int scale = 1;
	197	int dot = 0;
	198	int i;
	199	unsigned long msec;
	200	size_t len;
	201
	202	strcpy(base, "safe_mode_delay");
	203	if (load_sys(fname, buf))
	204	goto abort;
	205
	206	/* remove a period, and count digits after it */
	207	len = strlen(buf);
	208	for (i = 0; i < len; i++) {
	209	if (dot) {
	210	if (isdigit(buf[i])) {
	211	buf[i-1] = buf[i];
	212	scale *= 10;
	213	}
	214	buf[i] = 0;
	215	} else if (buf[i] == '.') {
	216	dot=1;
	217	buf[i] = 0;
	218	}
	219	}
	220	msec = strtoul(buf, NULL, 10);
	221	msec = (msec * 1000) / scale;
	222	sra->safe_mode_delay = msec;
	223	}
e86c9dd6 NB	224
	225	if (! (options & GET_DEVS))
	226	return sra;
	227
	228	/* Get all the devices as well */
	229	*base = 0;
	230	dir = opendir(fname);
	231	if (!dir)
	232	goto abort;
7e0f6979	233	sra->array.spare_disks = 0;
e86c9dd6 NB	234
	235	while ((de = readdir(dir)) != NULL) {
	236	char *ep;
	237	if (de->d_ino == 0 \|\|
	238	strncmp(de->d_name, "dev-", 4) != 0)
	239	continue;
	240	strcpy(base, de->d_name);
	241	dbase = base + strlen(base);
	242	*dbase++ = '/';
	243
	244	dev = malloc(sizeof(*dev));
	245	if (!dev)
	246	goto abort;
e86c9dd6 NB	247
	248	/* Always get slot, major, minor */
	249	strcpy(dbase, "slot");
4795982e DW	250	if (load_sys(fname, buf)) {
	251	/* hmm... unable to read 'slot' maybe the device
	252	* is going away?
	253	*/
	254	strcpy(dbase, "block");
	255	if (readlink(fname, buf, sizeof(buf)) < 0 &&
	256	errno != ENAMETOOLONG) {
	257	/* ...yup device is gone */
	258	free(dev);
	259	continue;
	260	} else {
	261	/* slot is unreadable but 'block' link
	262	* still intact... something bad is happening
	263	* so abort
	264	*/
	265	free(dev);
	266	goto abort;
	267	}
	268
	269	}
	270	dev->next = sra->devs;
	271	sra->devs = dev;
	272
	273	strcpy(dev->sys_name, de->d_name);
06c7f68e NB	274	dev->disk.raid_disk = strtoul(buf, &ep, 10);
06c7f68e NB	275	if (*ep) dev->disk.raid_disk = -1;
e86c9dd6 NB	276
	277	strcpy(dbase, "block/dev");
	278	if (load_sys(fname, buf))
	279	goto abort;
06c7f68e	280	sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor);
e86c9dd6 NB	281
	282	if (options & GET_OFFSET) {
	283	strcpy(dbase, "offset");
	284	if (load_sys(fname, buf))
	285	goto abort;
06c7f68e	286	dev->data_offset = strtoull(buf, NULL, 0);
e86c9dd6 NB	287	}
	288	if (options & GET_SIZE) {
	289	strcpy(dbase, "size");
	290	if (load_sys(fname, buf))
	291	goto abort;
047d2e49	292	dev->component_size = strtoull(buf, NULL, 0) * 2;
e86c9dd6 NB	293	}
e86c9dd6 NB	294	if (options & GET_STATE) {
06c7f68e	295	dev->disk.state = 0;
e86c9dd6 NB	296	strcpy(dbase, "state");
	297	if (load_sys(fname, buf))
	298	goto abort;
	299	if (strstr(buf, "in_sync"))
06c7f68e	300	dev->disk.state \|= (1<<MD_DISK_SYNC);
e86c9dd6	301	if (strstr(buf, "faulty"))
06c7f68e NB	302	dev->disk.state \|= (1<<MD_DISK_FAULTY);
06c7f68e NB	303	if (dev->disk.state == 0)
7e0f6979	304	sra->array.spare_disks++;
e86c9dd6 NB	305	}
	306	if (options & GET_ERROR) {
	307	strcpy(buf, "errors");
	308	if (load_sys(fname, buf))
	309	goto abort;
	310	dev->errors = strtoul(buf, NULL, 0);
	311	}
	312	}
355726fa	313	closedir(dir);
e86c9dd6 NB	314	return sra;
	315
	316	abort:
355726fa NB	317	if (dir)
355726fa NB	318	closedir(dir);
8382f19b	319	sysfs_free(sra);
e86c9dd6 NB	320	return NULL;
	321	}
	322
1770662b DW	323	int sysfs_attr_match(const char attr, const char str)
	324	{
	325	/* See if attr, read from a sysfs file, matches
	326	* str. They must either be the same, or attr can
	327	* have a trailing newline or comma
	328	*/
	329	while (attr && str && attr == str) {
	330	attr++;
	331	str++;
	332	}
	333
	334	if (str \|\| (attr && attr != ',' && attr != '\n'))
	335	return 0;
	336	return 1;
	337	}
	338
	339	int sysfs_match_word(const char word, char *list)
	340	{
	341	int n;
	342	for (n=0; list[n]; n++)
	343	if (sysfs_attr_match(word, list[n]))
	344	break;
	345	return n;
	346	}
	347
e86c9dd6 NB	348	unsigned long long get_component_size(int fd)
	349	{
	350	/* Find out the component size of the array.
	351	* We cannot trust GET_ARRAY_INFO ioctl as it's
	352	* size field is only 32bits.
	353	* So look in /sys/block/mdXXX/md/component_size
353632d9	354	*
8686f3ed	355	* This returns in units of sectors.
e86c9dd6 NB	356	*/
	357	struct stat stb;
	358	char fname[50];
	359	int n;
	360	if (fstat(fd, &stb)) return 0;
4ebd3237	361	if (major(stb.st_rdev) != get_mdp_major())
e86c9dd6	362	sprintf(fname, "/sys/block/md%d/md/component_size",
ea24acd0	363	(int)minor(stb.st_rdev));
e86c9dd6 NB	364	else
e86c9dd6 NB	365	sprintf(fname, "/sys/block/md_d%d/md/component_size",
ea24acd0	366	(int)minor(stb.st_rdev)>>MdpMinorShift);
e86c9dd6 NB	367	fd = open(fname, O_RDONLY);
	368	if (fd < 0)
	369	return 0;
	370	n = read(fd, fname, sizeof(fname));
	371	close(fd);
	372	if (n == sizeof(fname))
	373	return 0;
	374	fname[n] = 0;
8686f3ed	375	return strtoull(fname, NULL, 10) * 2;
e86c9dd6 NB	376	}
e86c9dd6 NB	377
7e0f6979	378	int sysfs_set_str(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	379	char name, char val)
	380	{
	381	char fname[50];
	382	int n;
	383	int fd;
7e1432fb	384
e86c9dd6	385	sprintf(fname, "/sys/block/%s/md/%s/%s",
7e0f6979	386	sra->sys_name, dev?dev->sys_name:"", name);
e86c9dd6 NB	387	fd = open(fname, O_WRONLY);
	388	if (fd < 0)
	389	return -1;
	390	n = write(fd, val, strlen(val));
	391	close(fd);
2a24d7b6 DW	392	if (n != strlen(val)) {
	393	dprintf(Name ": failed to write '%s' to '%s' (%s)\n",
	394	val, fname, strerror(errno));
e86c9dd6	395	return -1;
2a24d7b6	396	}
e86c9dd6 NB	397	return 0;
	398	}
	399
7e0f6979	400	int sysfs_set_num(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	401	char *name, unsigned long long val)
	402	{
	403	char valstr[50];
	404	sprintf(valstr, "%llu", val);
	405	return sysfs_set_str(sra, dev, name, valstr);
	406	}
	407
97590376 N	408	int sysfs_uevent(struct mdinfo sra, char event)
	409	{
	410	char fname[50];
	411	int n;
	412	int fd;
	413
	414	sprintf(fname, "/sys/block/%s/uevent",
	415	sra->sys_name);
	416	fd = open(fname, O_WRONLY);
	417	if (fd < 0)
	418	return -1;
	419	n = write(fd, event, strlen(event));
	420	close(fd);
	421	return 0;
	422	}
	423
7e0f6979	424	int sysfs_get_ll(struct mdinfo sra, struct mdinfo dev,
e86c9dd6 NB	425	char name, unsigned long long val)
	426	{
	427	char fname[50];
	428	char buf[50];
	429	int n;
	430	int fd;
	431	char *ep;
	432	sprintf(fname, "/sys/block/%s/md/%s/%s",
7e0f6979	433	sra->sys_name, dev?dev->sys_name:"", name);
e86c9dd6 NB	434	fd = open(fname, O_RDONLY);
	435	if (fd < 0)
	436	return -1;
	437	n = read(fd, buf, sizeof(buf));
	438	close(fd);
	439	if (n <= 0)
	440	return -1;
	441	buf[n] = 0;
	442	*val = strtoull(buf, &ep, 0);
	443	if (ep == buf \|\| (ep != 0 && ep != '\n' && *ep != ' '))
	444	return -1;
	445	return 0;
	446	}
2503d23b	447
8ed3e5e1 DW	448	int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms)
	449	{
	450	unsigned long sec;
	451	unsigned long msec;
	452	char delay[30];
	453
	454	sec = ms / 1000;
0dd3ba30	455	msec = ms % 1000;
8ed3e5e1	456
0dd3ba30 DW	457	sprintf(delay, "%ld.%03ld\n", sec, msec);
0dd3ba30 DW	458	/* this '\n' ^ needed for kernels older than 2.6.28 */
8ed3e5e1 DW	459	return sysfs_set_str(sra, NULL, "safe_mode_delay", delay);
	460	}
	461
f35f2525	462	int sysfs_set_array(struct mdinfo *info, int vers)
2503d23b NB	463	{
2503d23b NB	464	int rv = 0;
f35f2525 N	465	char ver[100];
	466
	467	ver[0] = 0;
	468	if (info->array.major_version == -1 &&
	469	info->array.minor_version == -2) {
	470	strcat(strcpy(ver, "external:"), info->text_version);
	471
	472	if ((vers % 100) < 2 \|\|
	473	sysfs_set_str(info, NULL, "metadata_version",
	474	ver) < 0) {
	475	fprintf(stderr, Name ": This kernel does not "
	476	"support external metadata.\n");
	477	return 1;
	478	}
	479	}
2503d23b NB	480	if (info->array.level < 0)
2503d23b NB	481	return 0; /* FIXME */
f35f2525	482	rv \|= sysfs_set_str(info, NULL, "level",
2503d23b	483	map_num(pers, info->array.level));
f35f2525 N	484	rv \|= sysfs_set_num(info, NULL, "raid_disks", info->array.raid_disks);
	485	rv \|= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size);
	486	rv \|= sysfs_set_num(info, NULL, "layout", info->array.layout);
	487	rv \|= sysfs_set_num(info, NULL, "component_size", info->component_size/2);
	488	if (info->array.level > 0)
	489	rv \|= sysfs_set_num(info, NULL, "resync_start", info->resync_start);
2503d23b NB	490	return rv;
	491	}
	492
2318b9f0	493	int sysfs_add_disk(struct mdinfo sra, struct mdinfo sd)
2503d23b NB	494	{
	495	char dv[100];
	496	char nm[100];
2503d23b NB	497	char *dname;
	498	int rv;
	499
	500	sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor);
	501	rv = sysfs_set_str(sra, NULL, "new_dev", dv);
	502	if (rv)
	503	return rv;
	504
	505	memset(nm, 0, sizeof(nm));
	506	sprintf(dv, "/sys/dev/block/%d:%d", sd->disk.major, sd->disk.minor);
73649188 N	507	rv = readlink(dv, nm, sizeof(nm));
73649188 N	508	if (rv <= 0)
2503d23b	509	return -1;
73649188	510	nm[rv] = '\0';
2503d23b NB	511	dname = strrchr(nm, '/');
	512	if (dname) dname++;
	513	strcpy(sd->sys_name, "dev-");
	514	strcpy(sd->sys_name+4, dname);
	515
73649188	516	rv = sysfs_set_num(sra, sd, "offset", sd->data_offset);
2503d23b NB	517	rv \|= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2);
	518	if (sra->array.level != LEVEL_CONTAINER) {
	519	rv \|= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk);
	520	// rv \|= sysfs_set_str(sra, sd, "state", "in_sync");
	521	}
2503d23b NB	522	return rv;
2503d23b NB	523	}
90c8b707	524
755c99fa	525	#if 0
90c8b707 DW	526	int sysfs_disk_to_sg(int fd)
	527	{
	528	/* from an open block device, try find and open its corresponding
	529	* scsi_generic interface
	530	*/
	531	struct stat st;
	532	char path[256];
	533	char sg_path[256];
	534	char sg_major_minor[8];
	535	char *c;
	536	DIR *dir;
	537	struct dirent *de;
	538	int major, minor, rv;
	539
	540	if (fstat(fd, &st))
	541	return -1;
	542
	543	snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device",
	544	major(st.st_rdev), minor(st.st_rdev));
	545
	546	dir = opendir(path);
	547	if (!dir)
	548	return -1;
	549
	550	de = readdir(dir);
	551	while (de) {
	552	if (strncmp("scsi_generic:", de->d_name,
	553	strlen("scsi_generic:")) == 0)
	554	break;
	555	de = readdir(dir);
	556	}
	557	closedir(dir);
	558
	559	if (!de)
	560	return -1;
	561
	562	snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name);
	563	fd = open(sg_path, O_RDONLY);
	564	if (fd < 0)
	565	return fd;
	566
	567	rv = read(fd, sg_major_minor, sizeof(sg_major_minor));
	568	close(fd);
	569	if (rv < 0)
	570	return -1;
	571	else
	572	sg_major_minor[rv - 1] = '\0';
	573
	574	c = strchr(sg_major_minor, ':');
	575	*c = '\0';
	576	c++;
	577	major = strtol(sg_major_minor, NULL, 10);
	578	minor = strtol(c, NULL, 10);
	579	snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d",
	580	(int) getpid(), major, minor);
	581	if (mknod(path, S_IFCHR\|0600, makedev(major, minor))==0) {
	582	fd = open(path, O_RDONLY);
	583	unlink(path);
	584	return fd;
	585	}
	586
	587	return -1;
	588	}
755c99fa	589	#endif
90c8b707	590
f1665f72 DW	591	int sysfs_disk_to_scsi_id(int fd, __u32 *id)
	592	{
	593	/* from an open block device, try to retrieve it scsi_id */
	594	struct stat st;
	595	char path[256];
	596	char c1, c2;
	597	DIR *dir;
	598	struct dirent *de;
	599
	600	if (fstat(fd, &st))
	601	return 1;
	602
	603	snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device",
	604	major(st.st_rdev), minor(st.st_rdev));
	605
	606	dir = opendir(path);
	607	if (!dir)
	608	return 1;
	609
	610	de = readdir(dir);
	611	while (de) {
	612	if (strncmp("scsi_disk:", de->d_name,
	613	strlen("scsi_disk:")) == 0)
	614	break;
	615	de = readdir(dir);
	616	}
	617	closedir(dir);
	618
	619	if (!de)
	620	return 1;
	621
	622	c1 = strchr(de->d_name, ':');
	623	c1++;
	624	c2 = strchr(c1, ':');
	625	*c2 = '\0';
	626	id = strtol(c1, NULL, 10) << 24; / host */
	627	c1 = c2 + 1;
	628	c2 = strchr(c1, ':');
	629	*c2 = '\0';
	630	id \|= strtol(c1, NULL, 10) << 16; / channel */
	631	c1 = c2 + 1;
	632	c2 = strchr(c1, ':');
	633	*c2 = '\0';
	634	id \|= strtol(c1, NULL, 10) << 8; / lun */
	635	c1 = c2 + 1;
	636	id \|= strtol(c1, NULL, 10); / id */
	637
	638	return 0;
	639	}
f94d52f4 NB	640
	641
	642	int sysfs_unique_holder(int devnum, long rdev)
	643	{
	644	/* Check that devnum is a holder of rdev,
	645	* and is the only holder.
	646	* we should be locked against races by
	647	* an O_EXCL on devnum
	648	*/
	649	DIR *dir;
	650	struct dirent *de;
	651	char dirname[100];
	652	char l;
	653	int found = 0;
	654	sprintf(dirname, "/sys/dev/block/%d:%d/holders",
	655	major(rdev), minor(rdev));
	656	dir = opendir(dirname);
	657	errno = ENOENT;
	658	if (!dir)
	659	return 0;
	660	l = strlen(dirname);
	661	while ((de = readdir(dir)) != NULL) {
	662	char buf[10];
	663	int n;
	664	int mj, mn;
	665	char c;
	666	int fd;
	667
	668	if (de->d_ino == 0)
	669	continue;
	670	if (de->d_name[0] == '.')
	671	continue;
	672	strcpy(dirname+l, "/");
	673	strcat(dirname+l, de->d_name);
	674	strcat(dirname+l, "/dev");
	675	fd = open(dirname, O_RDONLY);
	676	if (fd < 0) {
	677	errno = ENOENT;
	678	break;
	679	}
	680	n = read(fd, buf, sizeof(buf)-1);
	681	close(fd);
	682	buf[n] = 0;
	683	if (sscanf(buf, "%d:%d%c", &mj, &mn, &c) != 3 \|\|
	684	c != '\n') {
	685	errno = ENOENT;
	686	break;
	687	}
	688	if (mj != MD_MAJOR)
	689	mn = -1-(mn>>6);
	690
	691	if (devnum != mn) {
	692	errno = EEXIST;
	693	break;
	694	}
	695	found = 1;
	696	}
	697	closedir(dir);
	698	if (de)
	699	return 0;
	700	else
	701	return found;
	702	}