Sometimes we want to convert a devnum to a devname without allocating memory. So provide function to do the formatting without allocation. Signed-off-by: NeilBrown <neilb@suse.de>
924 lines
20 KiB
C
924 lines
20 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) 2006-2009 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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#include <ctype.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 (n && 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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void sysfs_free(struct mdinfo *sra)
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{
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while (sra) {
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struct mdinfo *sra2 = sra->next;
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while (sra->devs) {
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struct mdinfo *d = sra->devs;
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sra->devs = d->next;
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free(d);
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}
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free(sra);
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sra = sra2;
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}
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}
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int sysfs_open(int devnum, char *devname, char *attr)
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{
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char fname[50];
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int fd;
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char *mdname = devnum2devname(devnum);
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if (!mdname)
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return -1;
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sprintf(fname, "/sys/block/%s/md/", mdname);
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if (devname) {
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strcat(fname, devname);
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strcat(fname, "/");
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}
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strcat(fname, attr);
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fd = open(fname, O_RDWR);
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if (fd < 0 && errno == EACCES)
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fd = open(fname, O_RDONLY);
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free(mdname);
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return fd;
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}
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void sysfs_init(struct mdinfo *mdi, int fd, int devnum)
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{
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mdi->sys_name[0] = 0;
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if (fd >= 0) {
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mdu_version_t vers;
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if (ioctl(fd, RAID_VERSION, &vers) != 0)
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return;
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devnum = fd2devnum(fd);
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}
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if (devnum == NoMdDev)
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return;
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fmt_devname(mdi->sys_name, devnum);
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}
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struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options)
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{
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char fname[PATH_MAX];
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char buf[PATH_MAX];
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char *base;
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char *dbase;
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struct mdinfo *sra;
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struct mdinfo *dev;
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DIR *dir = NULL;
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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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memset(sra, 0, sizeof(*sra));
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sysfs_init(sra, fd, devnum);
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if (sra->sys_name[0] == 0) {
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free(sra);
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return NULL;
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}
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sprintf(fname, "/sys/block/%s/md/", sra->sys_name);
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base = fname + strlen(fname);
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sra->devs = NULL;
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if (options & GET_VERSION) {
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strcpy(base, "metadata_version");
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if (load_sys(fname, buf))
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goto abort;
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if (strncmp(buf, "none", 4) == 0) {
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sra->array.major_version =
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sra->array.minor_version = -1;
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strcpy(sra->text_version, "");
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} else if (strncmp(buf, "external:", 9) == 0) {
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sra->array.major_version = -1;
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sra->array.minor_version = -2;
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strcpy(sra->text_version, buf+9);
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} else {
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sscanf(buf, "%d.%d",
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&sra->array.major_version,
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&sra->array.minor_version);
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strcpy(sra->text_version, buf);
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}
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}
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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->array.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->array.layout = strtoul(buf, NULL, 0);
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}
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if (options & GET_DISKS) {
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strcpy(base, "raid_disks");
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if (load_sys(fname, buf))
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goto abort;
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sra->array.raid_disks = strtoul(buf, NULL, 0);
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}
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if (options & GET_DEGRADED) {
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strcpy(base, "degraded");
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if (load_sys(fname, buf))
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goto abort;
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sra->array.failed_disks = 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->array.chunk_size = 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_MISMATCH) {
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strcpy(base, "mismatch_cnt");
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if (load_sys(fname, buf))
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goto abort;
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sra->mismatch_cnt = strtoul(buf, NULL, 0);
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}
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if (options & GET_SAFEMODE) {
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int scale = 1;
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int dot = 0;
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unsigned i;
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unsigned long msec;
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size_t len;
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strcpy(base, "safe_mode_delay");
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if (load_sys(fname, buf))
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goto abort;
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/* remove a period, and count digits after it */
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len = strlen(buf);
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for (i = 0; i < len; i++) {
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if (dot) {
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if (isdigit(buf[i])) {
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buf[i-1] = buf[i];
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scale *= 10;
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}
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buf[i] = 0;
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} else if (buf[i] == '.') {
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dot=1;
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buf[i] = 0;
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}
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}
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msec = strtoul(buf, NULL, 10);
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msec = (msec * 1000) / scale;
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sra->safe_mode_delay = msec;
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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->array.spare_disks = 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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/* 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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/* hmm... unable to read 'slot' maybe the device
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* is going away?
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*/
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strcpy(dbase, "block");
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if (readlink(fname, buf, sizeof(buf)) < 0 &&
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errno != ENAMETOOLONG) {
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/* ...yup device is gone */
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free(dev);
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continue;
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} else {
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/* slot is unreadable but 'block' link
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* still intact... something bad is happening
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* so abort
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*/
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free(dev);
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goto abort;
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}
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}
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strcpy(dev->sys_name, de->d_name);
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dev->disk.raid_disk = strtoul(buf, &ep, 10);
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if (*ep) dev->disk.raid_disk = -1;
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strcpy(dbase, "block/dev");
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if (load_sys(fname, buf)) {
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/* assume this is a stale reference to a hot
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* removed device
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*/
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free(dev);
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continue;
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}
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sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor);
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/* special case check for block devices that can go 'offline' */
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strcpy(dbase, "block/device/state");
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if (load_sys(fname, buf) == 0 &&
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strncmp(buf, "offline", 7) == 0) {
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free(dev);
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continue;
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}
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/* finally add this disk to the array */
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dev->next = sra->devs;
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sra->devs = dev;
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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->data_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->component_size = strtoull(buf, NULL, 0) * 2;
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}
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if (options & GET_STATE) {
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dev->disk.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->disk.state |= (1<<MD_DISK_SYNC);
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if (strstr(buf, "faulty"))
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dev->disk.state |= (1<<MD_DISK_FAULTY);
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if (dev->disk.state == 0)
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sra->array.spare_disks++;
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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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closedir(dir);
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return sra;
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abort:
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if (dir)
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closedir(dir);
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sysfs_free(sra);
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return NULL;
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}
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int sysfs_attr_match(const char *attr, const char *str)
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{
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/* See if attr, read from a sysfs file, matches
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* str. They must either be the same, or attr can
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* have a trailing newline or comma
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*/
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while (*attr && *str && *attr == *str) {
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attr++;
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str++;
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}
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if (*str || (*attr && *attr != ',' && *attr != '\n'))
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return 0;
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return 1;
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}
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int sysfs_match_word(const char *word, char **list)
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{
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int n;
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for (n=0; list[n]; n++)
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if (sysfs_attr_match(word, list[n]))
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break;
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return n;
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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) != (unsigned)get_mdp_major())
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sprintf(fname, "/sys/block/md%d/md/component_size",
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(int)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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(int)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 mdinfo *sra, struct mdinfo *dev,
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char *name, char *val)
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{
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char fname[50];
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unsigned 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->sys_name, dev?dev->sys_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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dprintf(Name ": failed to write '%s' to '%s' (%s)\n",
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val, fname, strerror(errno));
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return -1;
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}
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return 0;
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}
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int sysfs_set_num(struct mdinfo *sra, struct mdinfo *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_uevent(struct mdinfo *sra, char *event)
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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/uevent",
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sra->sys_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, event, strlen(event));
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close(fd);
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return 0;
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}
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int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name)
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{
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char fname[50];
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struct stat st;
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sprintf(fname, "/sys/block/%s/md/%s/%s",
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sra->sys_name, dev?dev->sys_name:"", name);
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return stat(fname, &st) == 0;
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}
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int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev,
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char *name)
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{
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char fname[50];
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int fd;
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sprintf(fname, "/sys/block/%s/md/%s/%s",
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sra->sys_name, dev?dev->sys_name:"", name);
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fd = open(fname, O_RDWR);
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if (fd < 0)
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fd = open(fname, O_RDONLY);
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return fd;
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}
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int sysfs_fd_get_ll(int fd, unsigned long long *val)
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{
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char buf[50];
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int n;
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char *ep;
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lseek(fd, 0, 0);
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n = read(fd, buf, sizeof(buf));
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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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int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
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char *name, unsigned long long *val)
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{
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int n;
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int fd;
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fd = sysfs_get_fd(sra, dev, name);
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if (fd < 0)
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return -1;
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n = sysfs_fd_get_ll(fd, val);
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close(fd);
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return n;
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}
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int sysfs_fd_get_str(int fd, char *val, int size)
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{
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int n;
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lseek(fd, 0, 0);
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n = read(fd, val, size);
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if (n <= 0)
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return -1;
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val[n] = 0;
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return n;
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}
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int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev,
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char *name, char *val, int size)
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{
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int n;
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int fd;
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fd = sysfs_get_fd(sra, dev, name);
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if (fd < 0)
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return -1;
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n = sysfs_fd_get_str(fd, val, size);
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close(fd);
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return n;
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}
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int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms)
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{
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unsigned long sec;
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unsigned long msec;
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char delay[30];
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sec = ms / 1000;
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msec = ms % 1000;
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sprintf(delay, "%ld.%03ld\n", sec, msec);
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/* this '\n' ^ needed for kernels older than 2.6.28 */
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return sysfs_set_str(sra, NULL, "safe_mode_delay", delay);
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}
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int sysfs_set_array(struct mdinfo *info, int vers)
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{
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int rv = 0;
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char ver[100];
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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->custom_array_size) {
|
|
int rc;
|
|
|
|
rc = sysfs_set_num(info, NULL, "array_size",
|
|
info->custom_array_size/2);
|
|
if (rc && errno == ENOENT) {
|
|
fprintf(stderr, Name ": 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);
|
|
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;
|
|
|
|
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);
|
|
|
|
/* 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 (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);
|
|
}
|
|
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;
|
|
}
|
|
|
|
int sysfs_freeze_array(struct mdinfo *sra)
|
|
{
|
|
/* Try to freeze resync/rebuild on this array/container.
|
|
* Return -1 if the array is busy,
|
|
* return -2 container cannot be frozen,
|
|
* 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, "idle\n") != 0 &&
|
|
strcmp(buf, "frozen\n") != 0)
|
|
return -1;
|
|
if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
#ifndef MDASSEMBLE
|
|
|
|
static char *clean_states[] = {
|
|
"clear", "inactive", "readonly", "read-auto", "clean", NULL };
|
|
|
|
int WaitClean(char *dev, int sock, int verbose)
|
|
{
|
|
int fd;
|
|
struct mdinfo *mdi;
|
|
int rv = 1;
|
|
int devnum;
|
|
|
|
fd = open(dev, O_RDONLY);
|
|
if (fd < 0) {
|
|
if (verbose)
|
|
fprintf(stderr, Name ": Couldn't open %s: %s\n", dev, strerror(errno));
|
|
return 1;
|
|
}
|
|
|
|
devnum = fd2devnum(fd);
|
|
mdi = sysfs_read(fd, devnum, GET_VERSION|GET_LEVEL|GET_SAFEMODE);
|
|
if (!mdi) {
|
|
if (verbose)
|
|
fprintf(stderr, Name ": Failed to read sysfs attributes for "
|
|
"%s\n", dev);
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
switch(mdi->array.level) {
|
|
case LEVEL_LINEAR:
|
|
case LEVEL_MULTIPATH:
|
|
case 0:
|
|
/* safemode delay is irrelevant for these levels */
|
|
rv = 0;
|
|
|
|
}
|
|
|
|
/* for internal metadata the kernel handles the final clean
|
|
* transition, containers can never be dirty
|
|
*/
|
|
if (!is_subarray(mdi->text_version))
|
|
rv = 0;
|
|
|
|
/* safemode disabled ? */
|
|
if (mdi->safe_mode_delay == 0)
|
|
rv = 0;
|
|
|
|
if (rv) {
|
|
int state_fd = sysfs_open(fd2devnum(fd), NULL, "array_state");
|
|
char buf[20];
|
|
fd_set fds;
|
|
struct timeval tm;
|
|
|
|
/* minimize the safe_mode_delay and prepare to wait up to 5s
|
|
* for writes to quiesce
|
|
*/
|
|
sysfs_set_safemode(mdi, 1);
|
|
tm.tv_sec = 5;
|
|
tm.tv_usec = 0;
|
|
|
|
FD_ZERO(&fds);
|
|
|
|
/* wait for array_state to be clean */
|
|
while (1) {
|
|
rv = read(state_fd, buf, sizeof(buf));
|
|
if (rv < 0)
|
|
break;
|
|
if (sysfs_match_word(buf, clean_states) <= 4)
|
|
break;
|
|
FD_SET(state_fd, &fds);
|
|
rv = select(state_fd + 1, NULL, NULL, &fds, &tm);
|
|
if (rv < 0 && errno != EINTR)
|
|
break;
|
|
lseek(state_fd, 0, SEEK_SET);
|
|
}
|
|
if (rv < 0)
|
|
rv = 1;
|
|
else if (fping_monitor(sock) == 0 ||
|
|
ping_monitor(mdi->text_version) == 0) {
|
|
/* we need to ping to close the window between array
|
|
* state transitioning to clean and the metadata being
|
|
* marked clean
|
|
*/
|
|
rv = 0;
|
|
} else
|
|
rv = 1;
|
|
if (rv && verbose)
|
|
fprintf(stderr, Name ": Error waiting for %s to be clean\n",
|
|
dev);
|
|
|
|
/* restore the original safe_mode_delay */
|
|
sysfs_set_safemode(mdi, mdi->safe_mode_delay);
|
|
close(state_fd);
|
|
}
|
|
|
|
sysfs_free(mdi);
|
|
close(fd);
|
|
|
|
return rv;
|
|
}
|
|
#endif /* MDASSEMBLE */
|