758d3a8e7d
The setting used unfortunately requires intimate knowledge of the kernel, and it not reset when the reshape finishes.
276 lines
6.3 KiB
C
276 lines
6.3 KiB
C
/*
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* sysfs - extract md related information from sysfs. Part of:
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* mdadm - manage Linux "md" devices aka RAID arrays.
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*
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* Copyright (C) 2006 Neil Brown <neilb@suse.de>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Neil Brown
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* Email: <neilb@suse.de>
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*/
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#include "mdadm.h"
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#include <dirent.h>
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int load_sys(char *path, char *buf)
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{
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int fd = open(path, O_RDONLY);
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int n;
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if (fd < 0)
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return -1;
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n = read(fd, buf, 1024);
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close(fd);
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if (n <=0 || n >= 1024)
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return -1;
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buf[n] = 0;
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if (buf[n-1] == '\n')
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buf[n-1] = 0;
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return 0;
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}
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struct sysarray *sysfs_read(int fd, int devnum, unsigned long options)
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{
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/* Longest possible name in sysfs, mounted at /sys, is
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* /sys/block/md_dXXX/md/dev-XXXXX/block/dev
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* /sys/block/md_dXXX/md/metadata_version
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* which is about 41 characters. 50 should do for now
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*/
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char fname[50];
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char buf[1024];
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char *base;
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char *dbase;
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struct sysarray *sra;
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struct sysdev *dev;
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DIR *dir;
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struct dirent *de;
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sra = malloc(sizeof(*sra));
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if (sra == NULL)
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return sra;
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if (fd >= 0) {
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struct stat stb;
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if (fstat(fd, &stb)) return NULL;
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if (major(stb.st_rdev)==9)
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sprintf(sra->name, "md%d", minor(stb.st_rdev));
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else
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sprintf(sra->name, "md_d%d",
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minor(stb.st_rdev)>>MdpMinorShift);
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} else {
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if (devnum >= 0)
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sprintf(sra->name, "md%d", devnum);
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else
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sprintf(sra->name, "md_d%d",
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-1-devnum);
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}
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sprintf(fname, "/sys/block/%s/md/", sra->name);
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base = fname + strlen(fname);
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sra->devs = NULL;
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if (options & GET_LEVEL) {
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strcpy(base, "level");
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if (load_sys(fname, buf))
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goto abort;
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sra->level = map_name(pers, buf);
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}
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if (options & GET_LAYOUT) {
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strcpy(base, "layout");
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if (load_sys(fname, buf))
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goto abort;
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sra->layout = strtoul(buf, NULL, 0);
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}
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if (options & GET_COMPONENT) {
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strcpy(base, "component_size");
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if (load_sys(fname, buf))
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goto abort;
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sra->component_size = strtoull(buf, NULL, 0);
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/* sysfs reports "K", but we want sectors */
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sra->component_size *= 2;
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}
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if (options & GET_CHUNK) {
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strcpy(base, "chunk_size");
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if (load_sys(fname, buf))
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goto abort;
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sra->chunk = strtoul(buf, NULL, 0);
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}
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if (options & GET_CACHE) {
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strcpy(base, "stripe_cache_size");
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if (load_sys(fname, buf))
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goto abort;
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sra->cache_size = strtoul(buf, NULL, 0);
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}
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if (! (options & GET_DEVS))
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return sra;
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/* Get all the devices as well */
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*base = 0;
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dir = opendir(fname);
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if (!dir)
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goto abort;
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sra->spares = 0;
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while ((de = readdir(dir)) != NULL) {
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char *ep;
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if (de->d_ino == 0 ||
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strncmp(de->d_name, "dev-", 4) != 0)
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continue;
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strcpy(base, de->d_name);
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dbase = base + strlen(base);
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*dbase++ = '/';
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dev = malloc(sizeof(*dev));
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if (!dev)
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goto abort;
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dev->next = sra->devs;
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sra->devs = dev;
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/* Always get slot, major, minor */
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strcpy(dbase, "slot");
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if (load_sys(fname, buf))
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goto abort;
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dev->role = strtoul(buf, &ep, 10);
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if (*ep) dev->role = -1;
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strcpy(dbase, "block/dev");
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if (load_sys(fname, buf))
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goto abort;
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sscanf(buf, "%d:%d", &dev->major, &dev->minor);
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if (options & GET_OFFSET) {
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strcpy(dbase, "offset");
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if (load_sys(fname, buf))
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goto abort;
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dev->offset = strtoull(buf, NULL, 0);
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}
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if (options & GET_SIZE) {
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strcpy(dbase, "size");
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if (load_sys(fname, buf))
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goto abort;
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dev->size = strtoull(buf, NULL, 0);
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}
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if (options & GET_STATE) {
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dev->state = 0;
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strcpy(dbase, "state");
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if (load_sys(fname, buf))
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goto abort;
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if (strstr(buf, "in_sync"))
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dev->state |= (1<<MD_DISK_SYNC);
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if (strstr(buf, "faulty"))
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dev->state |= (1<<MD_DISK_FAULTY);
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if (dev->state == 0)
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sra->spares++;
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}
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if (options & GET_ERROR) {
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strcpy(buf, "errors");
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if (load_sys(fname, buf))
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goto abort;
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dev->errors = strtoul(buf, NULL, 0);
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}
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}
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return sra;
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abort:
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while (sra && sra->devs) {
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dev = sra->devs;
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sra->devs = dev->next;
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free(dev);
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}
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if(sra) free(sra);
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return NULL;
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}
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unsigned long long get_component_size(int fd)
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{
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/* Find out the component size of the array.
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* We cannot trust GET_ARRAY_INFO ioctl as it's
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* size field is only 32bits.
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* So look in /sys/block/mdXXX/md/component_size
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*
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* This returns in units of sectors.
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*/
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struct stat stb;
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char fname[50];
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int n;
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if (fstat(fd, &stb)) return 0;
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if (major(stb.st_rdev) == 9)
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sprintf(fname, "/sys/block/md%d/md/component_size",
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minor(stb.st_rdev));
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else
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sprintf(fname, "/sys/block/md_d%d/md/component_size",
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minor(stb.st_rdev)>>MdpMinorShift);
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fd = open(fname, O_RDONLY);
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if (fd < 0)
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return 0;
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n = read(fd, fname, sizeof(fname));
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close(fd);
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if (n == sizeof(fname))
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return 0;
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fname[n] = 0;
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return strtoull(fname, NULL, 10) * 2;
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}
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int sysfs_set_str(struct sysarray *sra, struct sysdev *dev,
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char *name, char *val)
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{
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char fname[50];
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int n;
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int fd;
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sprintf(fname, "/sys/block/%s/md/%s/%s",
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sra->name, dev?dev->name:"", name);
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fd = open(fname, O_WRONLY);
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if (fd < 0)
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return -1;
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n = write(fd, val, strlen(val));
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close(fd);
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if (n != strlen(val))
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return -1;
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return 0;
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}
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int sysfs_set_num(struct sysarray *sra, struct sysdev *dev,
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char *name, unsigned long long val)
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{
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char valstr[50];
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sprintf(valstr, "%llu", val);
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return sysfs_set_str(sra, dev, name, valstr);
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}
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int sysfs_get_ll(struct sysarray *sra, struct sysdev *dev,
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char *name, unsigned long long *val)
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{
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char fname[50];
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char buf[50];
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int n;
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int fd;
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char *ep;
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sprintf(fname, "/sys/block/%s/md/%s/%s",
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sra->name, dev?dev->name:"", name);
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fd = open(fname, O_RDONLY);
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if (fd < 0)
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return -1;
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n = read(fd, buf, sizeof(buf));
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close(fd);
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if (n <= 0)
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return -1;
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buf[n] = 0;
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*val = strtoull(buf, &ep, 0);
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if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))
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return -1;
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return 0;
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}
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