| /* |
| * 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) { |
| tv.tv_sec = 0; |
| tv.tv_usec = (*msec)*1000; |
| } else { |
| tv.tv_sec = (*msec)/1000; |
| tv.tv_usec = 0; |
| } |
| n = select(fd+1, NULL, NULL, &fds, &tv); |
| gettimeofday(&end, NULL); |
| end.tv_sec -= start.tv_sec; |
| *msec -= (end.tv_sec * 1000 + end.tv_usec/1000 |
| - start.tv_usec/1000) + 1; |
| } |
| return n; |
| } |
| |
| int sysfs_rules_apply_check(const struct mdinfo *sra, |
| const struct sysfs_entry *ent) |
| { |
| /* Check whether parameter is regular file, |
| * exists and is under specified directory. |
| */ |
| char fname[MAX_SYSFS_PATH_LEN]; |
| char dname[MAX_SYSFS_PATH_LEN]; |
| char resolved_path[PATH_MAX]; |
| char resolved_dir[PATH_MAX]; |
| int result; |
| |
| if (sra == NULL || ent == NULL) |
| return -1; |
| |
| result = snprintf(dname, MAX_SYSFS_PATH_LEN, |
| "/sys/block/%s/md/", sra->sys_name); |
| if (result < 0 || result >= MAX_SYSFS_PATH_LEN) |
| return -1; |
| |
| result = snprintf(fname, MAX_SYSFS_PATH_LEN, |
| "%s/%s", dname, ent->name); |
| if (result < 0 || result >= MAX_SYSFS_PATH_LEN) |
| return -1; |
| |
| if (realpath(fname, resolved_path) == NULL || |
| realpath(dname, resolved_dir) == NULL) |
| return -1; |
| |
| if (strncmp(resolved_dir, resolved_path, |
| strnlen(resolved_dir, PATH_MAX)) != 0) |
| return -1; |
| |
| return 0; |
| } |
| |
| static struct dev_sysfs_rule *sysfs_rules; |
| |
| void sysfs_rules_apply(char *devnm, struct mdinfo *dev) |
| { |
| struct dev_sysfs_rule *rules = sysfs_rules; |
| |
| while (rules) { |
| struct sysfs_entry *ent = rules->entry; |
| int match = 0; |
| |
| if (!rules->uuid_set) { |
| if (rules->devname) |
| match = strcmp(devnm, rules->devname) == 0; |
| } else { |
| match = memcmp(dev->uuid, rules->uuid, |
| sizeof(int[4])) == 0; |
| } |
| |
| while (match && ent) { |
| if (sysfs_rules_apply_check(dev, ent) < 0) |
| pr_err("SYSFS: failed to write '%s' to '%s'\n", |
| ent->value, ent->name); |
| else |
| sysfs_set_str(dev, NULL, ent->name, ent->value); |
| ent = ent->next; |
| } |
| rules = rules->next; |
| } |
| } |
| |
| static void sysfs_rule_free(struct dev_sysfs_rule *rule) |
| { |
| struct sysfs_entry *entry; |
| |
| while (rule) { |
| struct dev_sysfs_rule *tmp = rule->next; |
| |
| entry = rule->entry; |
| while (entry) { |
| struct sysfs_entry *tmp = entry->next; |
| |
| free(entry->name); |
| free(entry->value); |
| free(entry); |
| entry = tmp; |
| } |
| |
| if (rule->devname) |
| free(rule->devname); |
| free(rule); |
| rule = tmp; |
| } |
| } |
| |
| void sysfsline(char *line) |
| { |
| struct dev_sysfs_rule *sr; |
| char *w; |
| |
| sr = xcalloc(1, sizeof(*sr)); |
| for (w = dl_next(line); w != line ; w = dl_next(w)) { |
| if (strncasecmp(w, "name=", 5) == 0) { |
| char *devname = w + 5; |
| |
| if (strncmp(devname, "/dev/md/", 8) == 0) { |
| if (sr->devname) |
| pr_err("Only give one device per SYSFS line: %s\n", |
| devname); |
| else |
| sr->devname = xstrdup(devname); |
| } else { |
| pr_err("%s is an invalid name for an md device - ignored.\n", |
| devname); |
| } |
| } else if (strncasecmp(w, "uuid=", 5) == 0) { |
| char *uuid = w + 5; |
| |
| if (sr->uuid_set) { |
| pr_err("Only give one uuid per SYSFS line: %s\n", |
| uuid); |
| } else { |
| if (parse_uuid(w + 5, sr->uuid) && |
| memcmp(sr->uuid, uuid_zero, |
| sizeof(int[4])) != 0) |
| sr->uuid_set = 1; |
| else |
| pr_err("Invalid uuid: %s\n", uuid); |
| } |
| } else { |
| struct sysfs_entry *prop; |
| |
| char *sep = strchr(w, '='); |
| |
| if (sep == NULL || *(sep + 1) == 0) { |
| pr_err("Cannot parse \"%s\" - ignoring.\n", w); |
| continue; |
| } |
| |
| prop = xmalloc(sizeof(*prop)); |
| prop->value = xstrdup(sep + 1); |
| *sep = 0; |
| prop->name = xstrdup(w); |
| prop->next = sr->entry; |
| sr->entry = prop; |
| } |
| } |
| |
| if (!sr->devname && !sr->uuid_set) { |
| pr_err("Device name not found in sysfs config entry - ignoring.\n"); |
| sysfs_rule_free(sr); |
| return; |
| } |
| |
| sr->next = sysfs_rules; |
| sysfs_rules = sr; |
| } |