Adding upstream version 4.2.
Signed-off-by: Daniel Baumann <daniel@debian.org>
This commit is contained in:
parent
16732c81e5
commit
4fd4995b67
GPG key ID:
FBB4F0E80A80222F
279 changed files with 77998 additions and 0 deletions
909
monitor.c
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909
monitor.c
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/*
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* mdmon - monitor external metadata arrays
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*
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* Copyright (C) 2007-2009 Neil Brown <neilb@suse.de>
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* Copyright (C) 2007-2009 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "mdadm.h"
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#include "mdmon.h"
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#include <sys/syscall.h>
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#include <sys/select.h>
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#include <signal.h>
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static char *array_states[] = {
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"clear", "inactive", "suspended", "readonly", "read-auto",
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"clean", "active", "write-pending", "active-idle", "broken", NULL };
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static char *sync_actions[] = {
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"idle", "reshape", "resync", "recover", "check", "repair", NULL
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};
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enum bb_action {
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RECORD_BB = 1,
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COMPARE_BB,
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};
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static int write_attr(char *attr, int fd)
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{
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return write(fd, attr, strlen(attr));
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}
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static void add_fd(fd_set *fds, int *maxfd, int fd)
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{
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struct stat st;
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if (fd < 0)
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return;
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if (fstat(fd, &st) == -1) {
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dprintf("Invalid fd %d\n", fd);
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return;
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}
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if (st.st_nlink == 0) {
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dprintf("fd %d was deleted\n", fd);
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return;
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}
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if (fd > *maxfd)
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*maxfd = fd;
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FD_SET(fd, fds);
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}
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static int read_attr(char *buf, int len, int fd)
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{
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int n;
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if (fd < 0) {
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buf[0] = 0;
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return 0;
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}
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lseek(fd, 0, 0);
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n = read(fd, buf, len - 1);
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if (n <= 0) {
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buf[0] = 0;
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return 0;
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}
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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 n;
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}
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static void read_resync_start(int fd, unsigned long long *v)
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{
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char buf[30];
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int n;
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n = read_attr(buf, 30, fd);
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if (n <= 0) {
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dprintf("Failed to read resync_start (%d)\n", fd);
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return;
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}
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if (strncmp(buf, "none", 4) == 0)
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*v = MaxSector;
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else
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*v = strtoull(buf, NULL, 10);
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}
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static unsigned long long read_sync_completed(int fd)
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{
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unsigned long long val;
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char buf[50];
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int n;
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char *ep;
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n = read_attr(buf, 50, fd);
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if (n <= 0)
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return 0;
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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 0;
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return val;
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}
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static enum array_state read_state(int fd)
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{
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char buf[20];
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int n = read_attr(buf, 20, fd);
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if (n <= 0)
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return bad_word;
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return (enum array_state) sysfs_match_word(buf, array_states);
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}
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static enum sync_action read_action( int fd)
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{
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char buf[20];
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int n = read_attr(buf, 20, fd);
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if (n <= 0)
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return bad_action;
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return (enum sync_action) sysfs_match_word(buf, sync_actions);
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}
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int read_dev_state(int fd)
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{
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char buf[100];
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int n = read_attr(buf, sizeof(buf), fd);
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char *cp;
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int rv = 0;
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if (n <= 0)
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return 0;
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cp = buf;
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while (cp) {
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if (sysfs_attr_match(cp, "faulty"))
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rv |= DS_FAULTY;
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if (sysfs_attr_match(cp, "in_sync"))
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rv |= DS_INSYNC;
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if (sysfs_attr_match(cp, "write_mostly"))
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rv |= DS_WRITE_MOSTLY;
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if (sysfs_attr_match(cp, "spare"))
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rv |= DS_SPARE;
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if (sysfs_attr_match(cp, "blocked"))
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rv |= DS_BLOCKED;
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cp = strchr(cp, ',');
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if (cp)
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cp++;
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}
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return rv;
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}
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int process_ubb(struct active_array *a, struct mdinfo *mdi, const unsigned long
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long sector, const int length, const char *buf,
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const int buf_len)
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{
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struct superswitch *ss = a->container->ss;
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/*
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* record bad block in metadata first, then acknowledge it to the driver
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* via sysfs file
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*/
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if ((ss->record_bad_block(a, mdi->disk.raid_disk, sector, length)) &&
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(write(mdi->bb_fd, buf, buf_len) == buf_len))
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return 1;
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/*
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* failed to store or acknowledge bad block, switch of bad block support
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* to get it out of blocked state
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*/
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sysfs_set_str(&a->info, mdi, "state", "-external_bbl");
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return -1;
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}
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int compare_bb(struct active_array *a, struct mdinfo *mdi, const unsigned long
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long sector, const unsigned int length, void *arg)
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{
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struct superswitch *ss = a->container->ss;
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struct md_bb *bb = (struct md_bb *) arg;
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int record = 1;
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int i;
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for (i = 0; i < bb->count; i++) {
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unsigned long long start = bb->entries[i].sector;
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unsigned long long len = bb->entries[i].length;
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/*
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* bad block in metadata exactly matches bad block in kernel
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* list, just remove it from a list
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*/
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if ((start == sector) && (len == length)) {
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if (i < bb->count - 1)
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bb->entries[i] = bb->entries[bb->count - 1];
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bb->count -= 1;
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record = 0;
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break;
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}
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/*
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* bad block in metadata spans bad block in kernel list,
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* clear it and record new bad block
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*/
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if ((sector >= start) && (sector + length <= start + len)) {
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ss->clear_bad_block(a, mdi->disk.raid_disk, start, len);
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break;
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}
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}
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/* record all bad blocks not in metadata list */
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if (record && (ss->record_bad_block(a, mdi->disk.raid_disk, sector,
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length) <= 0)) {
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sysfs_set_str(&a->info, mdi, "state", "-external_bbl");
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return -1;
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}
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return 1;
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}
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static int read_bb_file(int fd, struct active_array *a, struct mdinfo *mdi,
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enum bb_action action, void *arg)
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{
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char buf[30];
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int n = 0;
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int ret = 0;
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int read_again = 0;
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int off = 0;
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int pos = 0;
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int preserve_pos = (action == RECORD_BB ? 0 : 1);
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if (lseek(fd, 0, SEEK_SET) == (off_t) -1)
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return -1;
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do {
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read_again = 0;
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n = read(fd, buf + pos, sizeof(buf) - 1 - pos);
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if (n < 0)
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return -1;
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n += pos;
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buf[n] = '\0';
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off = 0;
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while (off < n) {
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unsigned long long sector;
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int length;
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char newline;
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int consumed;
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int matched;
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int rc;
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/* kernel sysfs file format: "sector length\n" */
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matched = sscanf(buf + off, "%llu %d%c%n", §or,
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&length, &newline, &consumed);
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if ((matched != 3) && (off > 0)) {
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/* truncated entry, read again */
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if (preserve_pos) {
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pos = sizeof(buf) - off - 1;
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memmove(buf, buf + off, pos);
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} else {
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if (lseek(fd, 0, SEEK_SET) ==
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(off_t) -1)
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return -1;
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}
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read_again = 1;
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break;
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}
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if (matched != 3)
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return -1;
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if (newline != '\n')
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return -1;
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if (length <= 0)
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return -1;
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if (action == RECORD_BB)
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rc = process_ubb(a, mdi, sector, length,
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buf + off, consumed);
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else if (action == COMPARE_BB)
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rc = compare_bb(a, mdi, sector, length, arg);
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else
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rc = -1;
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if (rc < 0)
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return rc;
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ret += rc;
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off += consumed;
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}
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} while (read_again);
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return ret;
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}
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static int process_dev_ubb(struct active_array *a, struct mdinfo *mdi)
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{
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return read_bb_file(mdi->ubb_fd, a, mdi, RECORD_BB, NULL);
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}
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static int check_for_cleared_bb(struct active_array *a, struct mdinfo *mdi)
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{
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struct superswitch *ss = a->container->ss;
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struct md_bb *bb;
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int i;
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/*
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* Get a list of bad blocks for an array, then read list of
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* acknowledged bad blocks from kernel and compare it against metadata
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* list, clear all bad blocks remaining in metadata list
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*/
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bb = ss->get_bad_blocks(a, mdi->disk.raid_disk);
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if (!bb)
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return -1;
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if (read_bb_file(mdi->bb_fd, a, mdi, COMPARE_BB, bb) < 0)
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return -1;
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for (i = 0; i < bb->count; i++) {
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unsigned long long sector = bb->entries[i].sector;
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int length = bb->entries[i].length;
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ss->clear_bad_block(a, mdi->disk.raid_disk, sector, length);
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}
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return 0;
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}
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static void signal_manager(void)
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{
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/* tgkill(getpid(), mon_tid, SIGUSR1); */
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int pid = getpid();
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syscall(SYS_tgkill, pid, mgr_tid, SIGUSR1);
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}
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/* Monitor a set of active md arrays - all of which share the
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* same metadata - and respond to events that require
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* metadata update.
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*
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* New arrays are detected by another thread which allocates
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* required memory and attaches the data structure to our list.
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*
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* Events:
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* Array stops.
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* This is detected by array_state going to 'clear' or 'inactive'.
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* while we thought it was active.
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* Response is to mark metadata as clean and 'clear' the array(??)
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* write-pending
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* array_state if 'write-pending'
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* We mark metadata as 'dirty' then set array to 'active'.
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* active_idle
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* Either ignore, or mark clean, then mark metadata as clean.
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*
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* device fails
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* detected by rd-N/state reporting "faulty"
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* mark device as 'failed' in metadata, let the kernel release the
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* device by writing '-blocked' to rd/state, and finally write 'remove' to
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* rd/state. Before a disk can be replaced it must be failed and removed
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* from all container members, this will be preemptive for the other
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* arrays... safe?
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*
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* sync completes
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* sync_action was 'resync' and becomes 'idle' and resync_start becomes
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* MaxSector
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* Notify metadata that sync is complete.
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*
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* recovery completes
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* sync_action changes from 'recover' to 'idle'
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* Check each device state and mark metadata if 'faulty' or 'in_sync'.
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*
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* deal with resync
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* This only happens on finding a new array... mdadm will have set
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* 'resync_start' to the correct value. If 'resync_start' indicates that an
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* resync needs to occur set the array to the 'active' state rather than the
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* initial read-auto state.
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*
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*
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*
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* We wait for a change (poll/select) on array_state, sync_action, and
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* each rd-X/state file.
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* When we get any change, we check everything. So read each state file,
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* then decide what to do.
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*
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* The core action is to write new metadata to all devices in the array.
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* This is done at most once on any wakeup.
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* After that we might:
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* - update the array_state
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* - set the role of some devices.
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* - request a sync_action
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*
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*/
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#define ARRAY_DIRTY 1
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#define ARRAY_BUSY 2
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static int read_and_act(struct active_array *a, fd_set *fds)
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{
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unsigned long long sync_completed;
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int check_degraded = 0;
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int check_reshape = 0;
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int deactivate = 0;
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struct mdinfo *mdi;
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int ret = 0;
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int count = 0;
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struct timeval tv;
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a->next_state = bad_word;
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a->next_action = bad_action;
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a->curr_state = read_state(a->info.state_fd);
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a->curr_action = read_action(a->action_fd);
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if (a->curr_state != clear)
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/*
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* In "clear" state, resync_start may wrongly be set to "0"
|
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* when the kernel called md_clean but didn't remove the
|
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* sysfs attributes yet
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*/
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read_resync_start(a->resync_start_fd, &a->info.resync_start);
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sync_completed = read_sync_completed(a->sync_completed_fd);
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for (mdi = a->info.devs; mdi ; mdi = mdi->next) {
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mdi->next_state = 0;
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mdi->curr_state = 0;
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if (mdi->state_fd >= 0) {
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read_resync_start(mdi->recovery_fd,
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&mdi->recovery_start);
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mdi->curr_state = read_dev_state(mdi->state_fd);
|
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}
|
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/*
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* If array is blocked and metadata handler is able to handle
|
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* BB, check if you can acknowledge them to md driver. If
|
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* successful, clear faulty state and unblock the array.
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*/
|
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if ((mdi->curr_state & DS_BLOCKED) &&
|
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a->container->ss->record_bad_block &&
|
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(process_dev_ubb(a, mdi) > 0)) {
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mdi->next_state |= DS_UNBLOCK;
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}
|
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if (FD_ISSET(mdi->bb_fd, fds))
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check_for_cleared_bb(a, mdi);
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}
|
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|
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gettimeofday(&tv, NULL);
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dprintf("(%d): %ld.%06ld state:%s prev:%s action:%s prev: %s start:%llu\n",
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a->info.container_member,
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tv.tv_sec, tv.tv_usec,
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array_states[a->curr_state],
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array_states[a->prev_state],
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sync_actions[a->curr_action],
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||||
sync_actions[a->prev_action],
|
||||
a->info.resync_start
|
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);
|
||||
|
||||
if ((a->curr_state == bad_word || a->curr_state <= inactive) &&
|
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a->prev_state > inactive) {
|
||||
/* array has been stopped */
|
||||
a->container->ss->set_array_state(a, 1);
|
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a->next_state = clear;
|
||||
deactivate = 1;
|
||||
}
|
||||
if (a->curr_state == write_pending) {
|
||||
a->container->ss->set_array_state(a, 0);
|
||||
a->next_state = active;
|
||||
ret |= ARRAY_DIRTY;
|
||||
}
|
||||
if (a->curr_state == active_idle) {
|
||||
/* Set array to 'clean' FIRST, then mark clean
|
||||
* in the metadata
|
||||
*/
|
||||
a->next_state = clean;
|
||||
ret |= ARRAY_DIRTY;
|
||||
}
|
||||
if ((a->curr_state == clean) || (a->curr_state == broken)) {
|
||||
a->container->ss->set_array_state(a, 1);
|
||||
}
|
||||
if (a->curr_state == active ||
|
||||
a->curr_state == suspended)
|
||||
ret |= ARRAY_DIRTY;
|
||||
if (a->curr_state == readonly) {
|
||||
/* Well, I'm ready to handle things. If readonly
|
||||
* wasn't requested, transition to read-auto.
|
||||
*/
|
||||
char buf[64];
|
||||
read_attr(buf, sizeof(buf), a->metadata_fd);
|
||||
if (strncmp(buf, "external:-", 10) == 0) {
|
||||
/* explicit request for readonly array. Leave it alone */
|
||||
;
|
||||
} else {
|
||||
if (a->container->ss->set_array_state(a, 2))
|
||||
a->next_state = read_auto; /* array is clean */
|
||||
else {
|
||||
a->next_state = active; /* Now active for recovery etc */
|
||||
ret |= ARRAY_DIRTY;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (!deactivate &&
|
||||
a->curr_action == idle &&
|
||||
a->prev_action == resync) {
|
||||
/* A resync has finished. The endpoint is recorded in
|
||||
* 'sync_start'. We don't update the metadata
|
||||
* until the array goes inactive or readonly though.
|
||||
* Just check if we need to fiddle spares.
|
||||
*/
|
||||
a->container->ss->set_array_state(a, a->curr_state <= clean);
|
||||
check_degraded = 1;
|
||||
}
|
||||
|
||||
if (!deactivate &&
|
||||
a->curr_action == idle &&
|
||||
a->prev_action == recover) {
|
||||
/* A recovery has finished. Some disks may be in sync now,
|
||||
* and the array may no longer be degraded
|
||||
*/
|
||||
for (mdi = a->info.devs ; mdi ; mdi = mdi->next) {
|
||||
a->container->ss->set_disk(a, mdi->disk.raid_disk,
|
||||
mdi->curr_state);
|
||||
if (! (mdi->curr_state & DS_INSYNC))
|
||||
check_degraded = 1;
|
||||
count++;
|
||||
}
|
||||
if (count != a->info.array.raid_disks)
|
||||
check_degraded = 1;
|
||||
}
|
||||
|
||||
if (!deactivate &&
|
||||
a->curr_action == reshape &&
|
||||
a->prev_action != reshape)
|
||||
/* reshape was requested by mdadm. Need to see if
|
||||
* new devices have been added. Manager does that
|
||||
* when it sees check_reshape
|
||||
*/
|
||||
check_reshape = 1;
|
||||
|
||||
/* Check for failures and if found:
|
||||
* 1/ Record the failure in the metadata and unblock the device.
|
||||
* FIXME update the kernel to stop notifying on failed drives when
|
||||
* the array is readonly and we have cleared 'blocked'
|
||||
* 2/ Try to remove the device if the array is writable, or can be
|
||||
* made writable.
|
||||
*/
|
||||
for (mdi = a->info.devs ; mdi ; mdi = mdi->next) {
|
||||
if (mdi->curr_state & DS_FAULTY) {
|
||||
a->container->ss->set_disk(a, mdi->disk.raid_disk,
|
||||
mdi->curr_state);
|
||||
check_degraded = 1;
|
||||
if (mdi->curr_state & DS_BLOCKED)
|
||||
mdi->next_state |= DS_UNBLOCK;
|
||||
if (a->curr_state == read_auto) {
|
||||
a->container->ss->set_array_state(a, 0);
|
||||
a->next_state = active;
|
||||
}
|
||||
if (a->curr_state > readonly)
|
||||
mdi->next_state |= DS_REMOVE;
|
||||
}
|
||||
}
|
||||
|
||||
/* Check for recovery checkpoint notifications. We need to be a
|
||||
* minimum distance away from the last checkpoint to prevent
|
||||
* over checkpointing. Note reshape checkpointing is handled
|
||||
* in the second branch.
|
||||
*/
|
||||
if (sync_completed > a->last_checkpoint &&
|
||||
sync_completed - a->last_checkpoint > a->info.component_size >> 4 &&
|
||||
a->curr_action > reshape) {
|
||||
/* A (non-reshape) sync_action has reached a checkpoint.
|
||||
* Record the updated position in the metadata
|
||||
*/
|
||||
a->last_checkpoint = sync_completed;
|
||||
a->container->ss->set_array_state(a, a->curr_state <= clean);
|
||||
} else if ((a->curr_action == idle && a->prev_action == reshape) ||
|
||||
(a->curr_action == reshape &&
|
||||
sync_completed > a->last_checkpoint)) {
|
||||
/* Reshape has progressed or completed so we need to
|
||||
* update the array state - and possibly the array size
|
||||
*/
|
||||
if (sync_completed != 0)
|
||||
a->last_checkpoint = sync_completed;
|
||||
/* We might need to update last_checkpoint depending on
|
||||
* the reason that reshape finished.
|
||||
* if array reshape is really finished:
|
||||
* set check point to the end, this allows
|
||||
* set_array_state() to finalize reshape in metadata
|
||||
* if reshape if broken: do not set checkpoint to the end
|
||||
* this allows for reshape restart from checkpoint
|
||||
*/
|
||||
if ((a->curr_action != reshape) &&
|
||||
(a->prev_action == reshape)) {
|
||||
char buf[40];
|
||||
if ((sysfs_get_str(&a->info, NULL,
|
||||
"reshape_position",
|
||||
buf,
|
||||
sizeof(buf)) >= 0) &&
|
||||
strncmp(buf, "none", 4) == 0)
|
||||
a->last_checkpoint = a->info.component_size;
|
||||
}
|
||||
a->container->ss->set_array_state(a, a->curr_state <= clean);
|
||||
a->last_checkpoint = sync_completed;
|
||||
}
|
||||
|
||||
if (sync_completed > a->last_checkpoint)
|
||||
a->last_checkpoint = sync_completed;
|
||||
|
||||
if (sync_completed >= a->info.component_size)
|
||||
a->last_checkpoint = 0;
|
||||
|
||||
a->container->ss->sync_metadata(a->container);
|
||||
dprintf("(%d): state:%s action:%s next(", a->info.container_member,
|
||||
array_states[a->curr_state], sync_actions[a->curr_action]);
|
||||
|
||||
/* Effect state changes in the array */
|
||||
if (a->next_state != bad_word) {
|
||||
dprintf_cont(" state:%s", array_states[a->next_state]);
|
||||
write_attr(array_states[a->next_state], a->info.state_fd);
|
||||
}
|
||||
if (a->next_action != bad_action) {
|
||||
write_attr(sync_actions[a->next_action], a->action_fd);
|
||||
dprintf_cont(" action:%s", sync_actions[a->next_action]);
|
||||
}
|
||||
for (mdi = a->info.devs; mdi ; mdi = mdi->next) {
|
||||
if (mdi->next_state & DS_UNBLOCK) {
|
||||
dprintf_cont(" %d:-blocked", mdi->disk.raid_disk);
|
||||
write_attr("-blocked", mdi->state_fd);
|
||||
}
|
||||
|
||||
if ((mdi->next_state & DS_REMOVE) && mdi->state_fd >= 0) {
|
||||
int remove_result;
|
||||
|
||||
/* The kernel may not be able to immediately remove the
|
||||
* disk. In that case we wait a little while and
|
||||
* try again.
|
||||
*/
|
||||
remove_result = write_attr("remove", mdi->state_fd);
|
||||
if (remove_result > 0) {
|
||||
dprintf_cont(" %d:removed", mdi->disk.raid_disk);
|
||||
close(mdi->state_fd);
|
||||
close(mdi->recovery_fd);
|
||||
close(mdi->bb_fd);
|
||||
close(mdi->ubb_fd);
|
||||
mdi->state_fd = -1;
|
||||
} else
|
||||
ret |= ARRAY_BUSY;
|
||||
}
|
||||
if (mdi->next_state & DS_INSYNC) {
|
||||
write_attr("+in_sync", mdi->state_fd);
|
||||
dprintf_cont(" %d:+in_sync", mdi->disk.raid_disk);
|
||||
}
|
||||
}
|
||||
dprintf_cont(" )\n");
|
||||
|
||||
/* move curr_ to prev_ */
|
||||
a->prev_state = a->curr_state;
|
||||
|
||||
a->prev_action = a->curr_action;
|
||||
|
||||
for (mdi = a->info.devs; mdi ; mdi = mdi->next) {
|
||||
mdi->prev_state = mdi->curr_state;
|
||||
mdi->next_state = 0;
|
||||
}
|
||||
|
||||
if (check_degraded || check_reshape) {
|
||||
/* manager will do the actual check */
|
||||
if (check_degraded)
|
||||
a->check_degraded = 1;
|
||||
if (check_reshape)
|
||||
a->check_reshape = 1;
|
||||
signal_manager();
|
||||
}
|
||||
|
||||
if (deactivate)
|
||||
a->container = NULL;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct mdinfo *
|
||||
find_device(struct active_array *a, int major, int minor)
|
||||
{
|
||||
struct mdinfo *mdi;
|
||||
|
||||
for (mdi = a->info.devs ; mdi ; mdi = mdi->next)
|
||||
if (mdi->disk.major == major && mdi->disk.minor == minor)
|
||||
return mdi;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static void reconcile_failed(struct active_array *aa, struct mdinfo *failed)
|
||||
{
|
||||
struct active_array *a;
|
||||
struct mdinfo *victim;
|
||||
|
||||
for (a = aa; a; a = a->next) {
|
||||
if (!a->container || a->to_remove)
|
||||
continue;
|
||||
victim = find_device(a, failed->disk.major, failed->disk.minor);
|
||||
if (!victim)
|
||||
continue;
|
||||
|
||||
if (!(victim->curr_state & DS_FAULTY))
|
||||
write_attr("faulty", victim->state_fd);
|
||||
}
|
||||
}
|
||||
|
||||
#ifdef DEBUG
|
||||
static void dprint_wake_reasons(fd_set *fds)
|
||||
{
|
||||
int i;
|
||||
char proc_path[256];
|
||||
char link[256];
|
||||
char *basename;
|
||||
int rv;
|
||||
|
||||
fprintf(stderr, "monitor: wake ( ");
|
||||
for (i = 0; i < FD_SETSIZE; i++) {
|
||||
if (FD_ISSET(i, fds)) {
|
||||
sprintf(proc_path, "/proc/%d/fd/%d",
|
||||
(int) getpid(), i);
|
||||
|
||||
rv = readlink(proc_path, link, sizeof(link) - 1);
|
||||
if (rv < 0) {
|
||||
fprintf(stderr, "%d:unknown ", i);
|
||||
continue;
|
||||
}
|
||||
link[rv] = '\0';
|
||||
basename = strrchr(link, '/');
|
||||
fprintf(stderr, "%d:%s ",
|
||||
i, basename ? ++basename : link);
|
||||
}
|
||||
}
|
||||
fprintf(stderr, ")\n");
|
||||
}
|
||||
#endif
|
||||
|
||||
int monitor_loop_cnt;
|
||||
|
||||
static int wait_and_act(struct supertype *container, int nowait)
|
||||
{
|
||||
fd_set rfds;
|
||||
int maxfd = 0;
|
||||
struct active_array **aap = &container->arrays;
|
||||
struct active_array *a, **ap;
|
||||
int rv;
|
||||
struct mdinfo *mdi;
|
||||
static unsigned int dirty_arrays = ~0; /* start at some non-zero value */
|
||||
|
||||
FD_ZERO(&rfds);
|
||||
|
||||
for (ap = aap ; *ap ;) {
|
||||
a = *ap;
|
||||
/* once an array has been deactivated we want to
|
||||
* ask the manager to discard it.
|
||||
*/
|
||||
if (!a->container || a->to_remove) {
|
||||
if (discard_this) {
|
||||
ap = &(*ap)->next;
|
||||
continue;
|
||||
}
|
||||
*ap = a->next;
|
||||
a->next = NULL;
|
||||
discard_this = a;
|
||||
signal_manager();
|
||||
continue;
|
||||
}
|
||||
|
||||
add_fd(&rfds, &maxfd, a->info.state_fd);
|
||||
add_fd(&rfds, &maxfd, a->action_fd);
|
||||
add_fd(&rfds, &maxfd, a->sync_completed_fd);
|
||||
for (mdi = a->info.devs ; mdi ; mdi = mdi->next) {
|
||||
add_fd(&rfds, &maxfd, mdi->state_fd);
|
||||
add_fd(&rfds, &maxfd, mdi->bb_fd);
|
||||
add_fd(&rfds, &maxfd, mdi->ubb_fd);
|
||||
}
|
||||
|
||||
ap = &(*ap)->next;
|
||||
}
|
||||
|
||||
if (manager_ready && (*aap == NULL || (sigterm && !dirty_arrays))) {
|
||||
/* No interesting arrays, or we have been told to
|
||||
* terminate and everything is clean. Lets see about
|
||||
* exiting. Note that blocking at this point is not a
|
||||
* problem as there are no active arrays, there is
|
||||
* nothing that we need to be ready to do.
|
||||
*/
|
||||
int fd;
|
||||
if (sigterm)
|
||||
fd = open_dev_excl(container->devnm);
|
||||
else
|
||||
fd = open_dev_flags(container->devnm, O_RDONLY|O_EXCL);
|
||||
if (fd >= 0 || errno != EBUSY) {
|
||||
/* OK, we are safe to leave */
|
||||
if (sigterm && !dirty_arrays)
|
||||
dprintf("caught sigterm, all clean... exiting\n");
|
||||
else
|
||||
dprintf("no arrays to monitor... exiting\n");
|
||||
if (!sigterm)
|
||||
/* On SIGTERM, someone (the take-over mdmon) will
|
||||
* clean up
|
||||
*/
|
||||
remove_pidfile(container->devnm);
|
||||
exit_now = 1;
|
||||
signal_manager();
|
||||
close(fd);
|
||||
exit(0);
|
||||
}
|
||||
}
|
||||
|
||||
if (!nowait) {
|
||||
sigset_t set;
|
||||
struct timespec ts;
|
||||
ts.tv_sec = 24*3600;
|
||||
ts.tv_nsec = 0;
|
||||
if (*aap == NULL || container->retry_soon) {
|
||||
/* just waiting to get O_EXCL access */
|
||||
ts.tv_sec = 0;
|
||||
ts.tv_nsec = 20000000ULL;
|
||||
}
|
||||
sigprocmask(SIG_UNBLOCK, NULL, &set);
|
||||
sigdelset(&set, SIGUSR1);
|
||||
monitor_loop_cnt |= 1;
|
||||
rv = pselect(maxfd+1, NULL, NULL, &rfds, &ts, &set);
|
||||
monitor_loop_cnt += 1;
|
||||
if (rv == -1) {
|
||||
if (errno == EINTR) {
|
||||
rv = 0;
|
||||
FD_ZERO(&rfds);
|
||||
dprintf("monitor: caught signal\n");
|
||||
} else
|
||||
dprintf("monitor: error %d in pselect\n",
|
||||
errno);
|
||||
}
|
||||
#ifdef DEBUG
|
||||
else
|
||||
dprint_wake_reasons(&rfds);
|
||||
#endif
|
||||
container->retry_soon = 0;
|
||||
}
|
||||
|
||||
if (update_queue) {
|
||||
struct metadata_update *this;
|
||||
|
||||
for (this = update_queue; this ; this = this->next)
|
||||
container->ss->process_update(container, this);
|
||||
|
||||
update_queue_handled = update_queue;
|
||||
update_queue = NULL;
|
||||
signal_manager();
|
||||
container->ss->sync_metadata(container);
|
||||
}
|
||||
|
||||
rv = 0;
|
||||
dirty_arrays = 0;
|
||||
for (a = *aap; a ; a = a->next) {
|
||||
|
||||
if (a->replaces && !discard_this) {
|
||||
struct active_array **ap;
|
||||
for (ap = &a->next; *ap && *ap != a->replaces;
|
||||
ap = & (*ap)->next)
|
||||
;
|
||||
if (*ap)
|
||||
*ap = (*ap)->next;
|
||||
discard_this = a->replaces;
|
||||
a->replaces = NULL;
|
||||
/* FIXME check if device->state_fd need to be cleared?*/
|
||||
signal_manager();
|
||||
}
|
||||
if (a->container && !a->to_remove) {
|
||||
int ret = read_and_act(a, &rfds);
|
||||
rv |= 1;
|
||||
dirty_arrays += !!(ret & ARRAY_DIRTY);
|
||||
/* when terminating stop manipulating the array after it
|
||||
* is clean, but make sure read_and_act() is given a
|
||||
* chance to handle 'active_idle'
|
||||
*/
|
||||
if (sigterm && !(ret & ARRAY_DIRTY))
|
||||
a->container = NULL; /* stop touching this array */
|
||||
if (ret & ARRAY_BUSY)
|
||||
container->retry_soon = 1;
|
||||
}
|
||||
}
|
||||
|
||||
/* propagate failures across container members */
|
||||
for (a = *aap; a ; a = a->next) {
|
||||
if (!a->container || a->to_remove)
|
||||
continue;
|
||||
for (mdi = a->info.devs ; mdi ; mdi = mdi->next)
|
||||
if (mdi->curr_state & DS_FAULTY)
|
||||
reconcile_failed(*aap, mdi);
|
||||
}
|
||||
|
||||
return rv;
|
||||
}
|
||||
|
||||
void do_monitor(struct supertype *container)
|
||||
{
|
||||
int rv;
|
||||
int first = 1;
|
||||
do {
|
||||
rv = wait_and_act(container, first);
|
||||
first = 0;
|
||||
} while (rv >= 0);
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue