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sysfs.c
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sysfs.c
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/*
* sysfs - extract md related information from sysfs. Part of:
* mdadm - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2006-2009 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>
#include "dlink.h"
#define MAX_SYSFS_PATH_LEN 120
struct dev_sysfs_rule {
struct dev_sysfs_rule *next;
char *devname;
int uuid[4];
int uuid_set;
struct sysfs_entry {
struct sysfs_entry *next;
char *name;
char *value;
} *entry;
};
int load_sys(char *path, char *buf, int len)
{
int fd = open(path, O_RDONLY);
int n;
if (fd < 0)
return -1;
n = read(fd, buf, len);
close(fd);
if (n <0 || n >= len)
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->bb.entries);
free(d);
}
free(sra->bb.entries);
free(sra);
sra = sra2;
}
}
int sysfs_open(char *devnm, char *devname, char *attr)
{
char fname[MAX_SYSFS_PATH_LEN];
int fd;
snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/", devnm);
if (devname) {
strncat(fname, devname, MAX_SYSFS_PATH_LEN - strlen(fname));
strncat(fname, "/", MAX_SYSFS_PATH_LEN - strlen(fname));
}
strncat(fname, attr, MAX_SYSFS_PATH_LEN - strlen(fname));
fd = open(fname, O_RDWR);
if (fd < 0 && errno == EACCES)
fd = open(fname, O_RDONLY);
return fd;
}
void sysfs_init_dev(struct mdinfo *mdi, dev_t devid)
{
snprintf(mdi->sys_name,
sizeof(mdi->sys_name), "dev-%s", devid2kname(devid));
}
int sysfs_init(struct mdinfo *mdi, int fd, char *devnm)
{
struct stat stb;
char fname[MAX_SYSFS_PATH_LEN];
int retval = -ENODEV;
mdi->sys_name[0] = 0;
if (fd >= 0)
devnm = fd2devnm(fd);
if (devnm == NULL)
goto out;
snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md", devnm);
if (stat(fname, &stb))
goto out;
if (!S_ISDIR(stb.st_mode))
goto out;
strcpy(mdi->sys_name, devnm);
retval = 0;
out:
return retval;
}
struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options)
{
char fname[PATH_MAX];
char buf[PATH_MAX];
char *base;
char *dbase;
struct mdinfo *sra;
struct mdinfo *dev, **devp;
DIR *dir = NULL;
struct dirent *de;
sra = xcalloc(1, sizeof(*sra));
if (sysfs_init(sra, fd, devnm)) {
free(sra);
return NULL;
}
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, sizeof(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, sizeof(buf)))
goto abort;
sra->array.level = map_name(pers, buf);
}
if (options & GET_LAYOUT) {
strcpy(base, "layout");
if (load_sys(fname, buf, sizeof(buf)))
goto abort;
sra->array.layout = strtoul(buf, NULL, 0);
}
if (options & (GET_DISKS|GET_STATE)) {
strcpy(base, "raid_disks");
if (load_sys(fname, buf, sizeof(buf)))
goto abort;
sra->array.raid_disks = strtoul(buf, NULL, 0);
}
if (options & GET_COMPONENT) {
strcpy(base, "component_size");
if (load_sys(fname, buf, sizeof(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, sizeof(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, sizeof(buf)))
/* Probably level doesn't support it */
sra->cache_size = 0;
else
sra->cache_size = strtoul(buf, NULL, 0);
}
if (options & GET_MISMATCH) {
strcpy(base, "mismatch_cnt");
if (load_sys(fname, buf, sizeof(buf)))
goto abort;
sra->mismatch_cnt = strtoul(buf, NULL, 0);
}
if (options & GET_SAFEMODE) {
int scale = 1;
int dot = 0;
unsigned i;
unsigned long msec;
size_t len;
strcpy(base, "safe_mode_delay");
if (load_sys(fname, buf, sizeof(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_BITMAP_LOCATION) {
strcpy(base, "bitmap/location");
if (load_sys(fname, buf, sizeof(buf)))
goto abort;
if (strncmp(buf, "file", 4) == 0)
sra->bitmap_offset = 1;
else if (strncmp(buf, "none", 4) == 0)
sra->bitmap_offset = 0;
else if (buf[0] == '+')
sra->bitmap_offset = strtol(buf+1, NULL, 10);
else
goto abort;
}
if (options & GET_ARRAY_STATE) {
strcpy(base, "array_state");
if (load_sys(fname, buf, sizeof(buf)))
goto abort;
sra->array_state = map_name(sysfs_array_states, buf);
}
if (options & GET_CONSISTENCY_POLICY) {
strcpy(base, "consistency_policy");
if (load_sys(fname, buf, sizeof(buf)))
sra->consistency_policy = CONSISTENCY_POLICY_UNKNOWN;
else
sra->consistency_policy = map_name(consistency_policies,
buf);
}
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;
sra->array.active_disks = 0;
sra->array.failed_disks = 0;
sra->array.working_disks = 0;
devp = &sra->devs;
sra->devs = NULL;
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 = xcalloc(1, sizeof(*dev));
/* Always get slot, major, minor */
strcpy(dbase, "slot");
if (load_sys(fname, buf, sizeof(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;
}
}
strcpy(dev->sys_name, de->d_name);
dev->disk.raid_disk = strtoul(buf, &ep, 10);
if (*ep) dev->disk.raid_disk = -1;
sra->array.nr_disks++;
strcpy(dbase, "block/dev");
if (load_sys(fname, buf, sizeof(buf))) {
/* assume this is a stale reference to a hot
* removed device
*/
if (!(options & GET_DEVS_ALL)) {
free(dev);
continue;
}
} else {
sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor);
}
if (!(options & GET_DEVS_ALL)) {
/* special case check for block devices that can go 'offline' */
strcpy(dbase, "block/device/state");
if (load_sys(fname, buf, sizeof(buf)) == 0 &&
strncmp(buf, "offline", 7) == 0) {
free(dev);
continue;
}
}
/* finally add this disk to the array */
*devp = dev;
devp = & dev->next;
dev->next = NULL;
if (options & GET_OFFSET) {
strcpy(dbase, "offset");
if (load_sys(fname, buf, sizeof(buf)))
goto abort;
dev->data_offset = strtoull(buf, NULL, 0);
strcpy(dbase, "new_offset");
if (load_sys(fname, buf, sizeof(buf)) == 0)
dev->new_data_offset = strtoull(buf, NULL, 0);
else
dev->new_data_offset = dev->data_offset;
}
if (options & GET_SIZE) {
strcpy(dbase, "size");
if (load_sys(fname, buf, sizeof(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, sizeof(buf)))
goto abort;
if (strstr(buf, "faulty"))
dev->disk.state |= (1<<MD_DISK_FAULTY);
else {
sra->array.working_disks++;
if (strstr(buf, "in_sync")) {
dev->disk.state |= (1<<MD_DISK_SYNC);
sra->array.active_disks++;
}
if (dev->disk.state == 0)
sra->array.spare_disks++;
}
}
if (options & GET_ERROR) {
strcpy(buf, "errors");
if (load_sys(fname, buf, sizeof(buf)))
goto abort;
dev->errors = strtoul(buf, NULL, 0);
}
}
if ((options & GET_STATE) && sra->array.raid_disks)
sra->array.failed_disks = sra->array.raid_disks -
sra->array.active_disks - sra->array.spare_disks;
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[MAX_SYSFS_PATH_LEN];
int n;
if (fstat(fd, &stb))
return 0;
snprintf(fname, MAX_SYSFS_PATH_LEN,
"/sys/block/%s/md/component_size", stat2devnm(&stb));
fd = open(fname, O_RDONLY);
if (fd < 0)
return 0;
n = read(fd, fname, sizeof(fname));
close(fd);
if (n < 0 || 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[MAX_SYSFS_PATH_LEN];
unsigned int n;
int fd;
snprintf(fname, MAX_SYSFS_PATH_LEN, "/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("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_set_num_signed(struct mdinfo *sra, struct mdinfo *dev,
char *name, long long val)
{
char valstr[50];
sprintf(valstr, "%lli", val);
return sysfs_set_str(sra, dev, name, valstr);
}
int sysfs_uevent(struct mdinfo *sra, char *event)
{
char fname[MAX_SYSFS_PATH_LEN];
int n;
int fd;
snprintf(fname, MAX_SYSFS_PATH_LEN, "/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);
if (n != (int)strlen(event)) {
dprintf("failed to write '%s' to '%s' (%s)\n",
event, fname, strerror(errno));
return -1;
}
return 0;
}
int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name)
{
char fname[MAX_SYSFS_PATH_LEN];
struct stat st;
snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s",
sra->sys_name, dev?dev->sys_name:"", name);
return stat(fname, &st) == 0;
}
int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev,
char *name)
{
char fname[MAX_SYSFS_PATH_LEN];
int fd;
snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s",
sra->sys_name, dev?dev->sys_name:"", name);
fd = open(fname, O_RDWR);
if (fd < 0)
fd = open(fname, O_RDONLY);
return fd;
}
int sysfs_fd_get_ll(int fd, unsigned long long *val)
{
char buf[50];
int n;
char *ep;
lseek(fd, 0, 0);
n = read(fd, buf, sizeof(buf));
if (n <= 0 || n == sizeof(buf))
return -2;
buf[n] = 0;
*val = strtoull(buf, &ep, 0);
if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))
return -1;
return 0;
}
int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
char *name, unsigned long long *val)
{
int n;
int fd;
fd = sysfs_get_fd(sra, dev, name);
if (fd < 0)
return -1;
n = sysfs_fd_get_ll(fd, val);
close(fd);
return n;
}
int sysfs_fd_get_two(int fd, unsigned long long *v1, unsigned long long *v2)
{
/* two numbers in this sysfs file, either
* NNN (NNN)
* or
* NNN / NNN
*/
char buf[80];
int n;
char *ep, *ep2;
lseek(fd, 0, 0);
n = read(fd, buf, sizeof(buf));
if (n <= 0 || n == sizeof(buf))
return -2;
buf[n] = 0;
*v1 = strtoull(buf, &ep, 0);
if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))
return -1;
while (*ep == ' ' || *ep == '/' || *ep == '(')
ep++;
*v2 = strtoull(ep, &ep2, 0);
if (ep2 == ep || (*ep2 != 0 && *ep2 != '\n' && *ep2 != ' ' && *ep2 != ')')) {
*v2 = *v1;
return 1;
}
return 2;
}
int sysfs_get_two(struct mdinfo *sra, struct mdinfo *dev,
char *name, unsigned long long *v1, unsigned long long *v2)
{
int n;
int fd;
fd = sysfs_get_fd(sra, dev, name);
if (fd < 0)
return -1;
n = sysfs_fd_get_two(fd, v1, v2);
close(fd);
return n;
}
int sysfs_fd_get_str(int fd, char *val, int size)
{
int n;
lseek(fd, 0, 0);
n = read(fd, val, size);
if (n <= 0 || n == size)
return -1;
val[n] = 0;
return n;
}
int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev,
char *name, char *val, int size)
{
int n;
int fd;
fd = sysfs_get_fd(sra, dev, name);
if (fd < 0)
return -1;
n = sysfs_fd_get_str(fd, val, size);
close(fd);
return n;
}
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];
int raid_disks = info->array.raid_disks;
ver[0] = 0;
if (info->array.major_version == -1 &&
info->array.minor_version == -2) {
char buf[1024];
strcat(strcpy(ver, "external:"), info->text_version);
/* meta version might already be set if we are setting
* new geometry for a reshape. In that case we don't
* want to over-write the 'readonly' flag that is
* stored in the metadata version. So read the current
* version first, and preserve the flag
*/
if (sysfs_get_str(info, NULL, "metadata_version",
buf, 1024) > 0)
if (strlen(buf) >= 9 && buf[9] == '-')
ver[9] = '-';
if ((vers % 100) < 2 ||
sysfs_set_str(info, NULL, "metadata_version",
ver) < 0) {
pr_err("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));
if (info->reshape_active && info->delta_disks != UnSet)
raid_disks -= info->delta_disks;
rv |= sysfs_set_num(info, NULL, "raid_disks", 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->custom_array_size) {
int rc;
rc = sysfs_set_num(info, NULL, "array_size",
info->custom_array_size/2);
if (rc && errno == ENOENT) {
pr_err("This kernel does not have the md/array_size attribute, the array may be larger than expected\n");
rc = 0;
}
rv |= rc;
}
if (info->array.level > 0)
rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start);
if (info->reshape_active) {
rv |= sysfs_set_num(info, NULL, "reshape_position",
info->reshape_progress);
rv |= sysfs_set_num(info, NULL, "chunk_size", info->new_chunk);
rv |= sysfs_set_num(info, NULL, "layout", info->new_layout);
rv |= sysfs_set_num(info, NULL, "raid_disks",
info->array.raid_disks);
/* We don't set 'new_level' here. That can only happen
* once the reshape completes.
*/
}
if (info->consistency_policy == CONSISTENCY_POLICY_PPL) {
if (sysfs_set_str(info, NULL, "consistency_policy",
map_num(consistency_policies,
info->consistency_policy))) {
pr_err("This kernel does not support PPL. Falling back to consistency-policy=resync.\n");
info->consistency_policy = CONSISTENCY_POLICY_RESYNC;
}
}
return rv;
}
int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume)
{
char dv[PATH_MAX];
char nm[PATH_MAX];
char *dname;
int rv;
int i;
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));
dname = devid2kname(makedev(sd->disk.major, sd->disk.minor));
strcpy(sd->sys_name, "dev-");
strcpy(sd->sys_name+4, dname);
/* test write to see if 'recovery_start' is available */
if (resume && sd->recovery_start < MaxSector &&
sysfs_set_num(sra, sd, "recovery_start", 0)) {
sysfs_set_str(sra, sd, "state", "remove");
return -1;
}
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) {
if (sra->consistency_policy == CONSISTENCY_POLICY_PPL) {
rv |= sysfs_set_num(sra, sd, "ppl_sector", sd->ppl_sector);
rv |= sysfs_set_num(sra, sd, "ppl_size", sd->ppl_size);
}
if (sd->recovery_start == MaxSector)
/* This can correctly fail if array isn't started,
* yet, so just ignore status for now.
*/
sysfs_set_str(sra, sd, "state", "insync");
if (sd->disk.raid_disk >= 0)
rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk);
if (resume)
sysfs_set_num(sra, sd, "recovery_start", sd->recovery_start);
}
if (sd->bb.supported) {
if (sysfs_set_str(sra, sd, "state", "external_bbl")) {
/*
* backward compatibility - if kernel doesn't support
* bad blocks for external metadata, let it continue
* as long as there are none known so far
*/
if (sd->bb.count) {
pr_err("The kernel has no support for bad blocks in external metadata\n");
return -1;
}
}
for (i = 0; i < sd->bb.count; i++) {
char s[30];
const struct md_bb_entry *entry = &sd->bb.entries[i];
snprintf(s, sizeof(s) - 1, "%llu %d\n", entry->sector,
entry->length);
rv |= sysfs_set_str(sra, sd, "bad_blocks", s);
}
}
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[10];
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 || rv == sizeof(sg_major_minor))
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];
DIR *dir;
struct dirent *de;
int host, bus, target, lun;
if (fstat(fd, &st))
return 1;
snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device/scsi_device",
major(st.st_rdev), minor(st.st_rdev));
dir = opendir(path);
if (!dir)
return 1;
for (de = readdir(dir); de; de = readdir(dir)) {
int count;
if (de->d_type != DT_DIR)
continue;
count = sscanf(de->d_name, "%d:%d:%d:%d", &host, &bus, &target, &lun);
if (count == 4)
break;
}
closedir(dir);
if (!de)
return 1;
*id = (host << 24) | (bus << 16) | (target << 8) | (lun << 0);
return 0;
}
int sysfs_unique_holder(char *devnm, long rdev)
{
/* Check that devnm is a holder of rdev,
* and is the only holder.
* we should be locked against races by
* an O_EXCL on devnm
* Return values:
* 0 - not unique, not even a holder
* 1 - unique, this is the only holder.
* 2/3 - not unique, there is another holder
* -1 - error, cannot find the holders
*/
DIR *dir;
struct dirent *de;
char dirname[100];
char l;
int ret = 0;
sprintf(dirname, "/sys/dev/block/%d:%d/holders",
major(rdev), minor(rdev));
dir = opendir(dirname);
if (!dir)
return -1;
l = strlen(dirname);
while ((de = readdir(dir)) != NULL) {
char buf[100];
char *sl;
int n;
if (de->d_ino == 0)
continue;
if (de->d_name[0] == '.')
continue;
strcpy(dirname+l, "/");
strcat(dirname+l, de->d_name);
n = readlink(dirname, buf, sizeof(buf)-1);
if (n <= 0)
continue;
buf[n] = 0;
sl = strrchr(buf, '/');
if (!sl)
continue;
sl++;
if (strcmp(devnm, sl) == 0)
ret |= 1;
else
ret |= 2;
}
closedir(dir);
return ret;
}
int sysfs_freeze_array(struct mdinfo *sra)
{
/* Try to freeze resync/rebuild on this array/container.
* Return -1 if the array is busy,
* return 0 if this kernel doesn't support 'frozen'
* return 1 if it worked.
*/
char buf[20];
if (!sysfs_attribute_available(sra, NULL, "sync_action"))
return 1; /* no sync_action == frozen */
if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0)
return 0;
if (strcmp(buf, "frozen\n") == 0)
/* Already frozen */
return 0;
if (strcmp(buf, "idle\n") != 0 && strcmp(buf, "recover\n") != 0)
return -1;
if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0)
return 0;
return 1;
}
int sysfs_wait(int fd, int *msec)
{
/* Wait up to '*msec' for fd to have an exception condition.
* if msec == NULL, wait indefinitely.
*/
fd_set fds;
int n;
FD_ZERO(&fds);
FD_SET(fd, &fds);
if (msec == NULL)
n = select(fd+1, NULL, NULL, &fds, NULL);
else if (*msec < 0)
n = 0;
else {
struct timeval start, end, tv;
gettimeofday(&start, NULL);
if (*msec < 1000) {