503975b9d5
malloc should never fail, and if it does it is unlikely that anything else useful can be done. Best approach is to abort and let some super-daemon restart. So define xmalloc, xcalloc, xrealloc, xstrdup which don't fail but just print a message and exit. Then use those removing all the tests for failure. Also replace all "malloc;memset" sequences with 'xcalloc'. Signed-off-by: NeilBrown <neilb@suse.de>
508 lines
11 KiB
C
508 lines
11 KiB
C
/*
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* mapfile - keep track of uuid <-> array mapping. Part of:
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* mdadm - manage Linux "md" devices aka RAID arrays.
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*
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* Copyright (C) 2006-2010 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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* Paper: Neil Brown
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* Novell Inc
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* GPO Box Q1283
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* QVB Post Office, NSW 1230
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* Australia
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*/
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/* The mapfile is used to track arrays being created in --incremental
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* mode. It particularly allows lookup from UUID to array device, but
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* also allows the array device name to be easily found.
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*
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* The map file is line based with space separated fields. The fields are:
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* Device id - mdX or mdpX where X is a number.
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* metadata - 0.90 1.0 1.1 1.2 ddf ...
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* UUID - uuid of the array
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* path - path where device created: /dev/md/home
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*
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* The best place for the mapfile is /run/mdadm/map. Distros and users
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* which have not switched to /run yet can choose a different location
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* at compile time via MAP_DIR and MAP_FILE.
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*/
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#include "mdadm.h"
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#include <sys/file.h>
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#include <ctype.h>
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#define MAP_READ 0
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#define MAP_NEW 1
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#define MAP_LOCK 2
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#define MAP_DIRNAME 3
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char *mapname[4] = {
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MAP_DIR "/" MAP_FILE,
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MAP_DIR "/" MAP_FILE ".new",
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MAP_DIR "/" MAP_FILE ".lock",
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MAP_DIR
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};
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int mapmode[3] = { O_RDONLY, O_RDWR|O_CREAT, O_RDWR|O_CREAT|O_TRUNC };
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char *mapsmode[3] = { "r", "w", "w"};
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FILE *open_map(int modenum)
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{
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int fd;
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if ((mapmode[modenum] & O_CREAT))
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/* Attempt to create directory, don't worry about
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* failure.
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*/
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(void)mkdir(mapname[MAP_DIRNAME], 0755);
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fd = open(mapname[modenum], mapmode[modenum], 0600);
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if (fd >= 0)
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return fdopen(fd, mapsmode[modenum]);
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return NULL;
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}
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int map_write(struct map_ent *mel)
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{
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FILE *f;
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int err;
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f = open_map(MAP_NEW);
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if (!f)
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return 0;
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for (; mel; mel = mel->next) {
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if (mel->bad)
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continue;
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if (mel->devnum < 0)
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fprintf(f, "mdp%d ", -1-mel->devnum);
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else
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fprintf(f, "md%d ", mel->devnum);
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fprintf(f, "%s ", mel->metadata);
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fprintf(f, "%08x:%08x:%08x:%08x ", mel->uuid[0],
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mel->uuid[1], mel->uuid[2], mel->uuid[3]);
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fprintf(f, "%s\n", mel->path?:"");
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}
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fflush(f);
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err = ferror(f);
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fclose(f);
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if (err) {
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unlink(mapname[1]);
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return 0;
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}
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return rename(mapname[1],
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mapname[0]) == 0;
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}
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static FILE *lf = NULL;
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int map_lock(struct map_ent **melp)
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{
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while (lf == NULL) {
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struct stat buf;
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lf = open_map(MAP_LOCK);
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if (lf == NULL)
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return -1;
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if (flock(fileno(lf), LOCK_EX) != 0) {
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fclose(lf);
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lf = NULL;
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return -1;
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}
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if (fstat(fileno(lf), &buf) != 0 ||
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buf.st_nlink == 0) {
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/* The owner of the lock unlinked it,
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* so we have a lock on a stale file,
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* try again
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*/
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fclose(lf);
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lf = NULL;
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}
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}
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if (*melp)
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map_free(*melp);
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map_read(melp);
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return 0;
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}
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void map_unlock(struct map_ent **melp)
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{
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if (lf) {
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/* must unlink before closing the file,
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* as only the owner of the lock may
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* unlink the file
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*/
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unlink(mapname[2]);
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fclose(lf);
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}
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lf = NULL;
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}
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void map_fork(void)
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{
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/* We are forking, so must close the lock file.
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* Don't risk flushing anything though.
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*/
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if (lf) {
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close(fileno(lf));
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fclose(lf);
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lf = NULL;
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}
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}
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void map_add(struct map_ent **melp,
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int devnum, char *metadata, int uuid[4], char *path)
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{
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struct map_ent *me = xmalloc(sizeof(*me));
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me->devnum = devnum;
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strcpy(me->metadata, metadata);
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memcpy(me->uuid, uuid, 16);
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me->path = path ? xstrdup(path) : NULL;
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me->next = *melp;
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me->bad = 0;
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*melp = me;
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}
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void map_read(struct map_ent **melp)
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{
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FILE *f;
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char buf[8192];
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char path[200];
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int devnum, uuid[4];
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char metadata[30];
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char nam[4];
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*melp = NULL;
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f = open_map(MAP_READ);
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if (!f) {
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RebuildMap();
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f = open_map(MAP_READ);
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}
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if (!f)
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return;
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while (fgets(buf, sizeof(buf), f)) {
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path[0] = 0;
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if (sscanf(buf, " %3[mdp]%d %s %x:%x:%x:%x %200s",
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nam, &devnum, metadata, uuid, uuid+1,
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uuid+2, uuid+3, path) >= 7) {
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if (strncmp(nam, "md", 2) != 0)
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continue;
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if (nam[2] == 'p')
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devnum = -1 - devnum;
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map_add(melp, devnum, metadata, uuid, path);
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}
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}
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fclose(f);
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}
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void map_free(struct map_ent *map)
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{
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while (map) {
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struct map_ent *mp = map;
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map = mp->next;
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free(mp->path);
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free(mp);
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}
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}
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int map_update(struct map_ent **mpp, int devnum, char *metadata,
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int *uuid, char *path)
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{
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struct map_ent *map, *mp;
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int rv;
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if (mpp && *mpp)
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map = *mpp;
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else
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map_read(&map);
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for (mp = map ; mp ; mp=mp->next)
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if (mp->devnum == devnum) {
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strcpy(mp->metadata, metadata);
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memcpy(mp->uuid, uuid, 16);
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free(mp->path);
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mp->path = path ? xstrdup(path) : NULL;
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mp->bad = 0;
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break;
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}
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if (!mp)
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map_add(&map, devnum, metadata, uuid, path);
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if (mpp)
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*mpp = NULL;
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rv = map_write(map);
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map_free(map);
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return rv;
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}
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void map_delete(struct map_ent **mapp, int devnum)
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{
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struct map_ent *mp;
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if (*mapp == NULL)
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map_read(mapp);
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for (mp = *mapp; mp; mp = *mapp) {
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if (mp->devnum == devnum) {
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*mapp = mp->next;
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free(mp->path);
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free(mp);
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} else
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mapp = & mp->next;
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}
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}
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void map_remove(struct map_ent **mapp, int devnum)
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{
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if (devnum == NoMdDev)
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return;
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map_delete(mapp, devnum);
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map_write(*mapp);
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map_free(*mapp);
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}
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struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4])
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{
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struct map_ent *mp;
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if (!*map)
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map_read(map);
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for (mp = *map ; mp ; mp = mp->next) {
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if (memcmp(uuid, mp->uuid, 16) != 0)
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continue;
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if (!mddev_busy(mp->devnum)) {
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mp->bad = 1;
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continue;
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}
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return mp;
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}
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return NULL;
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}
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struct map_ent *map_by_devnum(struct map_ent **map, int devnum)
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{
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struct map_ent *mp;
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if (!*map)
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map_read(map);
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for (mp = *map ; mp ; mp = mp->next) {
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if (mp->devnum != devnum)
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continue;
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if (!mddev_busy(mp->devnum)) {
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mp->bad = 1;
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continue;
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}
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return mp;
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}
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return NULL;
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}
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struct map_ent *map_by_name(struct map_ent **map, char *name)
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{
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struct map_ent *mp;
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if (!*map)
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map_read(map);
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for (mp = *map ; mp ; mp = mp->next) {
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if (!mp->path)
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continue;
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if (strncmp(mp->path, "/dev/md/", 8) != 0)
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continue;
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if (strcmp(mp->path+8, name) != 0)
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continue;
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if (!mddev_busy(mp->devnum)) {
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mp->bad = 1;
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continue;
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}
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return mp;
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}
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return NULL;
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}
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/* sets the proper subarray and container_dev according to the metadata
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* version super_by_fd does this automatically, this routine is meant as
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* a supplement for guess_super()
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*/
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static char *get_member_info(struct mdstat_ent *ent)
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{
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if (ent->metadata_version == NULL ||
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strncmp(ent->metadata_version, "external:", 9) != 0)
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return NULL;
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if (is_subarray(&ent->metadata_version[9])) {
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char *subarray;
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subarray = strrchr(ent->metadata_version, '/');
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return subarray + 1;
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}
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return NULL;
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}
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void RebuildMap(void)
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{
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struct mdstat_ent *mdstat = mdstat_read(0, 0);
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struct mdstat_ent *md;
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struct map_ent *map = NULL;
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int mdp = get_mdp_major();
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int require_homehost;
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char sys_hostname[256];
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char *homehost = conf_get_homehost(&require_homehost);
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if (homehost == NULL || strcmp(homehost, "<system>")==0) {
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if (gethostname(sys_hostname, sizeof(sys_hostname)) == 0) {
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sys_hostname[sizeof(sys_hostname)-1] = 0;
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homehost = sys_hostname;
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}
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}
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for (md = mdstat ; md ; md = md->next) {
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struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_DEVS);
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struct mdinfo *sd;
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if (!sra)
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continue;
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for (sd = sra->devs ; sd ; sd = sd->next) {
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char namebuf[100];
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char dn[30];
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int dfd;
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int ok;
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struct supertype *st;
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char *subarray = NULL;
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char *path;
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struct mdinfo *info;
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sprintf(dn, "%d:%d", sd->disk.major, sd->disk.minor);
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dfd = dev_open(dn, O_RDONLY);
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if (dfd < 0)
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continue;
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st = guess_super(dfd);
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if ( st == NULL)
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ok = -1;
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else {
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subarray = get_member_info(md);
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ok = st->ss->load_super(st, dfd, NULL);
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}
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close(dfd);
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if (ok != 0)
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continue;
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info = st->ss->container_content(st, subarray);
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if (!info)
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continue;
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if (md->devnum >= 0)
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path = map_dev(MD_MAJOR, md->devnum, 0);
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else
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path = map_dev(mdp, (-1-md->devnum)<< 6, 0);
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if (path == NULL ||
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strncmp(path, "/dev/md/", 8) != 0) {
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/* We would really like a name that provides
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* an MD_DEVNAME for udev.
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* The name needs to be unique both in /dev/md/
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* and in this mapfile.
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* It needs to match watch -I or -As would come
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* up with.
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* That means:
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* Check if array is in mdadm.conf
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* - if so use that.
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* determine trustworthy from homehost etc
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* find a unique name based on metadata name.
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*
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*/
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struct mddev_ident *match = conf_match(st, info,
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NULL, 0,
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NULL);
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struct stat stb;
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if (match && match->devname && match->devname[0] == '/') {
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path = match->devname;
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if (path[0] != '/') {
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strcpy(namebuf, "/dev/md/");
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strcat(namebuf, path);
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path = namebuf;
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}
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} else {
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int unum = 0;
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char *sep = "_";
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const char *name;
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int conflict = 1;
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if ((homehost == NULL ||
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st->ss->match_home(st, homehost) != 1) &&
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st->ss->match_home(st, "any") != 1 &&
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(require_homehost
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|| ! conf_name_is_free(info->name)))
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/* require a numeric suffix */
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unum = 0;
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else
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/* allow name to be used as-is if no conflict */
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unum = -1;
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name = info->name;
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if (!*name) {
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name = st->ss->name;
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if (!isdigit(name[strlen(name)-1]) &&
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unum == -1) {
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unum = 0;
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sep = "";
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}
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}
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if (strchr(name, ':'))
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/* probably a uniquifying
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* hostname prefix. Allow
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* without a suffix
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*/
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unum = -1;
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while (conflict) {
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if (unum >= 0)
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sprintf(namebuf, "/dev/md/%s%s%d",
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name, sep, unum);
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else
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sprintf(namebuf, "/dev/md/%s",
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name);
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unum++;
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if (lstat(namebuf, &stb) != 0 &&
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(map == NULL ||
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!map_by_name(&map, namebuf+8)))
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conflict = 0;
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}
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path = namebuf;
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}
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}
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map_add(&map, md->devnum,
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info->text_version,
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info->uuid, path);
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st->ss->free_super(st);
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free(info);
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break;
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}
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sysfs_free(sra);
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}
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/* Only trigger a change if we wrote a new map file */
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if (map_write(map))
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for (md = mdstat ; md ; md = md->next) {
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struct mdinfo *sra = sysfs_read(-1, md->devnum,
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GET_VERSION);
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if (sra)
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sysfs_uevent(sra, "change");
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sysfs_free(sra);
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}
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map_free(map);
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free_mdstat(mdstat);
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}
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