| /* |
| * mdmon - monitor external metadata arrays |
| * |
| * Copyright (C) 2007-2009 Neil Brown <neilb@suse.de> |
| * Copyright (C) 2007-2009 Intel Corporation |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| |
| #include "mdadm.h" |
| #include "mdmon.h" |
| #include <sys/syscall.h> |
| #include <sys/select.h> |
| #include <signal.h> |
| |
| static char *array_states[] = { |
| "clear", "inactive", "suspended", "readonly", "read-auto", |
| "clean", "active", "write-pending", "active-idle", NULL }; |
| static char *sync_actions[] = { |
| "idle", "reshape", "resync", "recover", "check", "repair", NULL |
| }; |
| |
| enum bb_action { |
| RECORD_BB = 1, |
| COMPARE_BB, |
| }; |
| |
| static int write_attr(char *attr, int fd) |
| { |
| return write(fd, attr, strlen(attr)); |
| } |
| |
| static void add_fd(fd_set *fds, int *maxfd, int fd) |
| { |
| struct stat st; |
| if (fd < 0) |
| return; |
| if (fstat(fd, &st) == -1) { |
| dprintf("Invalid fd %d\n", fd); |
| return; |
| } |
| if (st.st_nlink == 0) { |
| dprintf("fd %d was deleted\n", fd); |
| return; |
| } |
| if (fd > *maxfd) |
| *maxfd = fd; |
| FD_SET(fd, fds); |
| } |
| |
| static int read_attr(char *buf, int len, int fd) |
| { |
| int n; |
| |
| if (fd < 0) { |
| buf[0] = 0; |
| return 0; |
| } |
| lseek(fd, 0, 0); |
| n = read(fd, buf, len - 1); |
| |
| if (n <= 0) { |
| buf[0] = 0; |
| return 0; |
| } |
| buf[n] = 0; |
| if (buf[n-1] == '\n') |
| buf[n-1] = 0; |
| return n; |
| } |
| |
| static void read_resync_start(int fd, unsigned long long *v) |
| { |
| char buf[30]; |
| int n; |
| |
| n = read_attr(buf, 30, fd); |
| if (n <= 0) { |
| dprintf("Failed to read resync_start (%d)\n", fd); |
| return; |
| } |
| if (strncmp(buf, "none", 4) == 0) |
| *v = MaxSector; |
| else |
| *v = strtoull(buf, NULL, 10); |
| } |
| |
| static unsigned long long read_sync_completed(int fd) |
| { |
| unsigned long long val; |
| char buf[50]; |
| int n; |
| char *ep; |
| |
| n = read_attr(buf, 50, fd); |
| |
| if (n <= 0) |
| return 0; |
| buf[n] = 0; |
| val = strtoull(buf, &ep, 0); |
| if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) |
| return 0; |
| return val; |
| } |
| |
| static enum array_state read_state(int fd) |
| { |
| char buf[20]; |
| int n = read_attr(buf, 20, fd); |
| |
| if (n <= 0) |
| return bad_word; |
| return (enum array_state) sysfs_match_word(buf, array_states); |
| } |
| |
| static enum sync_action read_action( int fd) |
| { |
| char buf[20]; |
| int n = read_attr(buf, 20, fd); |
| |
| if (n <= 0) |
| return bad_action; |
| return (enum sync_action) sysfs_match_word(buf, sync_actions); |
| } |
| |
| int read_dev_state(int fd) |
| { |
| char buf[100]; |
| int n = read_attr(buf, sizeof(buf), fd); |
| char *cp; |
| int rv = 0; |
| |
| if (n <= 0) |
| return 0; |
| |
| cp = buf; |
| while (cp) { |
| if (sysfs_attr_match(cp, "faulty")) |
| rv |= DS_FAULTY; |
| if (sysfs_attr_match(cp, "in_sync")) |
| rv |= DS_INSYNC; |
| if (sysfs_attr_match(cp, "write_mostly")) |
| rv |= DS_WRITE_MOSTLY; |
| if (sysfs_attr_match(cp, "spare")) |
| rv |= DS_SPARE; |
| if (sysfs_attr_match(cp, "blocked")) |
| rv |= DS_BLOCKED; |
| cp = strchr(cp, ','); |
| if (cp) |
| cp++; |
| } |
| return rv; |
| } |
| |
| int process_ubb(struct active_array *a, struct mdinfo *mdi, const unsigned long |
| long sector, const int length, const char *buf, |
| const int buf_len) |
| { |
| struct superswitch *ss = a->container->ss; |
| |
| /* |
| * record bad block in metadata first, then acknowledge it to the driver |
| * via sysfs file |
| */ |
| if ((ss->record_bad_block(a, mdi->disk.raid_disk, sector, length)) && |
| (write(mdi->bb_fd, buf, buf_len) == buf_len)) |
| return 1; |
| |
| /* |
| * failed to store or acknowledge bad block, switch of bad block support |
| * to get it out of blocked state |
| */ |
| sysfs_set_str(&a->info, mdi, "state", "-external_bbl"); |
| return -1; |
| } |
| |
| int compare_bb(struct active_array *a, struct mdinfo *mdi, const unsigned long |
| long sector, const unsigned int length, void *arg) |
| { |
| struct superswitch *ss = a->container->ss; |
| struct md_bb *bb = (struct md_bb *) arg; |
| int record = 1; |
| int i; |
| |
| for (i = 0; i < bb->count; i++) { |
| unsigned long long start = bb->entries[i].sector; |
| unsigned long long len = bb->entries[i].length; |
| |
| /* |
| * bad block in metadata exactly matches bad block in kernel |
| * list, just remove it from a list |
| */ |
| if ((start == sector) && (len == length)) { |
| if (i < bb->count - 1) |
| bb->entries[i] = bb->entries[bb->count - 1]; |
| bb->count -= 1; |
| record = 0; |
| break; |
| } |
| /* |
| * bad block in metadata spans bad block in kernel list, |
| * clear it and record new bad block |
| */ |
| if ((sector >= start) && (sector + length <= start + len)) { |
| ss->clear_bad_block(a, mdi->disk.raid_disk, start, len); |
| break; |
| } |
| } |
| |
| /* record all bad blocks not in metadata list */ |
| if (record && (ss->record_bad_block(a, mdi->disk.raid_disk, sector, |
| length) <= 0)) { |
| sysfs_set_str(&a->info, mdi, "state", "-external_bbl"); |
| return -1; |
| } |
| |
| return 1; |
| } |
| |
| static int read_bb_file(int fd, struct active_array *a, struct mdinfo *mdi, |
| enum bb_action action, void *arg) |
| { |
| char buf[30]; |
| int n = 0; |
| int ret = 0; |
| int read_again = 0; |
| int off = 0; |
| int pos = 0; |
| int preserve_pos = (action == RECORD_BB ? 0 : 1); |
| |
| if (lseek(fd, 0, SEEK_SET) == (off_t) -1) |
| return -1; |
| |
| do { |
| read_again = 0; |
| n = read(fd, buf + pos, sizeof(buf) - 1 - pos); |
| if (n < 0) |
| return -1; |
| n += pos; |
| |
| buf[n] = '\0'; |
| off = 0; |
| |
| while (off < n) { |
| unsigned long long sector; |
| int length; |
| char newline; |
| int consumed; |
| int matched; |
| int rc; |
| |
| /* kernel sysfs file format: "sector length\n" */ |
| matched = sscanf(buf + off, "%llu %d%c%n", §or, |
| &length, &newline, &consumed); |
| if ((matched != 3) && (off > 0)) { |
| /* truncated entry, read again */ |
| if (preserve_pos) { |
| pos = sizeof(buf) - off - 1; |
| memmove(buf, buf + off, pos); |
| } else { |
| if (lseek(fd, 0, SEEK_SET) == |
| (off_t) -1) |
| return -1; |
| } |
| read_again = 1; |
| break; |
| } |
| if (matched != 3) |
| return -1; |
| if (newline != '\n') |
| return -1; |
| if (length <= 0) |
| return -1; |
| |
| if (action == RECORD_BB) |
| rc = process_ubb(a, mdi, sector, length, |
| buf + off, consumed); |
| else if (action == COMPARE_BB) |
| rc = compare_bb(a, mdi, sector, length, arg); |
| else |
| rc = -1; |
| |
| if (rc < 0) |
| return rc; |
| ret += rc; |
| off += consumed; |
| } |
| } while (read_again); |
| |
| return ret; |
| } |
| |
| static int process_dev_ubb(struct active_array *a, struct mdinfo *mdi) |
| { |
| return read_bb_file(mdi->ubb_fd, a, mdi, RECORD_BB, NULL); |
| } |
| |
| static int check_for_cleared_bb(struct active_array *a, struct mdinfo *mdi) |
| { |
| struct superswitch *ss = a->container->ss; |
| struct md_bb *bb; |
| int i; |
| |
| /* |
| * Get a list of bad blocks for an array, then read list of |
| * acknowledged bad blocks from kernel and compare it against metadata |
| * list, clear all bad blocks remaining in metadata list |
| */ |
| bb = ss->get_bad_blocks(a, mdi->disk.raid_disk); |
| if (!bb) |
| return -1; |
| |
| if (read_bb_file(mdi->bb_fd, a, mdi, COMPARE_BB, bb) < 0) |
| return -1; |
| |
| for (i = 0; i < bb->count; i++) { |
| unsigned long long sector = bb->entries[i].sector; |
| int length = bb->entries[i].length; |
| |
| ss->clear_bad_block(a, mdi->disk.raid_disk, sector, length); |
| } |
| |
| return 0; |
| } |
| |
| static void signal_manager(void) |
| { |
| /* tgkill(getpid(), mon_tid, SIGUSR1); */ |
| int pid = getpid(); |
| syscall(SYS_tgkill, pid, mgr_tid, SIGUSR1); |
| } |
| |
| /* Monitor a set of active md arrays - all of which share the |
| * same metadata - and respond to events that require |
| * metadata update. |
| * |
| * New arrays are detected by another thread which allocates |
| * required memory and attaches the data structure to our list. |
| * |
| * Events: |
| * Array stops. |
| * This is detected by array_state going to 'clear' or 'inactive'. |
| * while we thought it was active. |
| * Response is to mark metadata as clean and 'clear' the array(??) |
| * write-pending |
| * array_state if 'write-pending' |
| * We mark metadata as 'dirty' then set array to 'active'. |
| * active_idle |
| * Either ignore, or mark clean, then mark metadata as clean. |
| * |
| * device fails |
| * detected by rd-N/state reporting "faulty" |
| * mark device as 'failed' in metadata, let the kernel release the |
| * device by writing '-blocked' to rd/state, and finally write 'remove' to |
| * rd/state. Before a disk can be replaced it must be failed and removed |
| * from all container members, this will be preemptive for the other |
| * arrays... safe? |
| * |
| * sync completes |
| * sync_action was 'resync' and becomes 'idle' and resync_start becomes |
| * MaxSector |
| * Notify metadata that sync is complete. |
| * |
| * recovery completes |
| * sync_action changes from 'recover' to 'idle' |
| * Check each device state and mark metadata if 'faulty' or 'in_sync'. |
| * |
| * deal with resync |
| * This only happens on finding a new array... mdadm will have set |
| * 'resync_start' to the correct value. If 'resync_start' indicates that an |
| * resync needs to occur set the array to the 'active' state rather than the |
| * initial read-auto state. |
| * |
| * |
| * |
| * We wait for a change (poll/select) on array_state, sync_action, and |
| * each rd-X/state file. |
| * When we get any change, we check everything. So read each state file, |
| * then decide what to do. |
| * |
| * The core action is to write new metadata to all devices in the array. |
| * This is done at most once on any wakeup. |
| * After that we might: |
| * - update the array_state |
| * - set the role of some devices. |
| * - request a sync_action |
| * |
| */ |
| |
| #define ARRAY_DIRTY 1 |
| #define ARRAY_BUSY 2 |
| static int read_and_act(struct active_array *a, fd_set *fds) |
| { |
| unsigned long long sync_completed; |
| int check_degraded = 0; |
| int check_reshape = 0; |
| int deactivate = 0; |
| struct mdinfo *mdi; |
| int ret = 0; |
| int count = 0; |
| struct timeval tv; |
| |
| a->next_state = bad_word; |
| a->next_action = bad_action; |
| |
| a->curr_state = read_state(a->info.state_fd); |
| a->curr_action = read_action(a->action_fd); |
| if (a->curr_state != clear) |
| /* |
| * In "clear" state, resync_start may wrongly be set to "0" |
| * when the kernel called md_clean but didn't remove the |
| * sysfs attributes yet |
| */ |
| read_resync_start(a->resync_start_fd, &a->info.resync_start); |
| sync_completed = read_sync_completed(a->sync_completed_fd); |
| for (mdi = a->info.devs; mdi ; mdi = mdi->next) { |
| mdi->next_state = 0; |
| mdi->curr_state = 0; |
| if (mdi->state_fd >= 0) { |
| read_resync_start(mdi->recovery_fd, |
| &mdi->recovery_start); |
| mdi->curr_state = read_dev_state(mdi->state_fd); |
| } |
| /* |
| * If array is blocked and metadata handler is able to handle |
| * BB, check if you can acknowledge them to md driver. If |
| * successful, clear faulty state and unblock the array. |
| */ |
| if ((mdi->curr_state & DS_BLOCKED) && |
| a->container->ss->record_bad_block && |
| (process_dev_ubb(a, mdi) > 0)) { |
| mdi->next_state |= DS_UNBLOCK; |
| } |
| if (FD_ISSET(mdi->bb_fd, fds)) |
| check_for_cleared_bb(a, mdi); |
| } |
| |
| gettimeofday(&tv, NULL); |
| dprintf("(%d): %ld.%06ld state:%s prev:%s action:%s prev: %s start:%llu\n", |
| a->info.container_member, |
| tv.tv_sec, tv.tv_usec, |
| array_states[a->curr_state], |
| array_states[a->prev_state], |
| sync_actions[a->curr_action], |
| sync_actions[a->prev_action], |
| a->info.resync_start |
| ); |
| |
| if ((a->curr_state == bad_word || a->curr_state <= inactive) && |
| a->prev_state > inactive) { |
| /* array has been stopped */ |
| a->container->ss->set_array_state(a, 1); |
| 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->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); |
| } |