static struct block_device_operations md_fops;
+static int start_readonly;
+
/*
* Enables to iterate over all existing md arrays
* all_mddevs_lock protects this list.
mddev->size = le64_to_cpu(sb->size)/2;
mddev->events = le64_to_cpu(sb->events);
mddev->bitmap_offset = 0;
- mddev->default_bitmap_offset = 0;
mddev->default_bitmap_offset = 1024;
mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
{
mdk_rdev_t *same_pdev;
char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
+ struct kobject *ko;
if (rdev->mddev) {
MD_BUG();
rdev->kobj.parent = &mddev->kobj;
kobject_add(&rdev->kobj);
- sysfs_create_link(&rdev->kobj, &rdev->bdev->bd_disk->kobj, "block");
+ if (rdev->bdev->bd_part)
+ ko = &rdev->bdev->bd_part->kobj;
+ else
+ ko = &rdev->bdev->bd_disk->kobj;
+ sysfs_create_link(&rdev->kobj, ko, "block");
return 0;
}
};
static ssize_t
-rdev_show_state(mdk_rdev_t *rdev, char *page)
+state_show(mdk_rdev_t *rdev, char *page)
{
char *sep = "";
int len=0;
return len+sprintf(page+len, "\n");
}
-static struct rdev_sysfs_entry rdev_state = {
- .attr = {.name = "state", .mode = S_IRUGO },
- .show = rdev_show_state,
-};
+static struct rdev_sysfs_entry
+rdev_state = __ATTR_RO(state);
static ssize_t
-rdev_show_super(mdk_rdev_t *rdev, char *page)
+super_show(mdk_rdev_t *rdev, char *page)
{
if (rdev->sb_loaded && rdev->sb_size) {
memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
} else
return 0;
}
-static struct rdev_sysfs_entry rdev_super = {
- .attr = {.name = "super", .mode = S_IRUGO },
- .show = rdev_show_super,
-};
+static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
+
static struct attribute *rdev_default_attrs[] = {
&rdev_state.attr,
&rdev_super.attr,
}
static ssize_t
-md_show_level(mddev_t *mddev, char *page)
+level_show(mddev_t *mddev, char *page)
{
mdk_personality_t *p = mddev->pers;
- if (p == NULL)
+ if (p == NULL && mddev->raid_disks == 0)
return 0;
if (mddev->level >= 0)
- return sprintf(page, "RAID-%d\n", mddev->level);
+ return sprintf(page, "raid%d\n", mddev->level);
else
return sprintf(page, "%s\n", p->name);
}
-static struct md_sysfs_entry md_level = {
- .attr = {.name = "level", .mode = S_IRUGO },
- .show = md_show_level,
-};
+static struct md_sysfs_entry md_level = __ATTR_RO(level);
static ssize_t
-md_show_rdisks(mddev_t *mddev, char *page)
+raid_disks_show(mddev_t *mddev, char *page)
{
+ if (mddev->raid_disks == 0)
+ return 0;
return sprintf(page, "%d\n", mddev->raid_disks);
}
-static struct md_sysfs_entry md_raid_disks = {
- .attr = {.name = "raid_disks", .mode = S_IRUGO },
- .show = md_show_rdisks,
-};
+static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks);
static ssize_t
-md_show_scan(mddev_t *mddev, char *page)
+action_show(mddev_t *mddev, char *page)
{
- char *type = "none";
+ char *type = "idle";
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
}
static ssize_t
-md_store_scan(mddev_t *mddev, const char *page, size_t len)
+action_store(mddev_t *mddev, const char *page, size_t len)
{
- int canscan=0;
+ if (!mddev->pers || !mddev->pers->sync_request)
+ return -EINVAL;
+
+ if (strcmp(page, "idle")==0 || strcmp(page, "idle\n")==0) {
+ if (mddev->sync_thread) {
+ set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+ md_unregister_thread(mddev->sync_thread);
+ mddev->sync_thread = NULL;
+ mddev->recovery = 0;
+ }
+ return len;
+ }
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
return -EBUSY;
- down(&mddev->reconfig_sem);
- if (mddev->pers && mddev->pers->sync_request)
- canscan=1;
- up(&mddev->reconfig_sem);
- if (!canscan)
- return -EINVAL;
-
- if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0)
- set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
- else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0)
- return -EINVAL;
- set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
- set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
- set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ if (strcmp(page, "resync")==0 || strcmp(page, "resync\n")==0 ||
+ strcmp(page, "recover")==0 || strcmp(page, "recover\n")==0)
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ else {
+ if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0)
+ set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
+ else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0)
+ return -EINVAL;
+ set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
+ set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ }
md_wakeup_thread(mddev->thread);
return len;
}
static ssize_t
-md_show_mismatch(mddev_t *mddev, char *page)
+mismatch_cnt_show(mddev_t *mddev, char *page)
{
return sprintf(page, "%llu\n",
(unsigned long long) mddev->resync_mismatches);
}
-static struct md_sysfs_entry md_scan_mode = {
- .attr = {.name = "scan_mode", .mode = S_IRUGO|S_IWUSR },
- .show = md_show_scan,
- .store = md_store_scan,
-};
+static struct md_sysfs_entry
+md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
-static struct md_sysfs_entry md_mismatches = {
- .attr = {.name = "mismatch_cnt", .mode = S_IRUGO },
- .show = md_show_mismatch,
-};
+
+static struct md_sysfs_entry
+md_mismatches = __ATTR_RO(mismatch_cnt);
static struct attribute *md_default_attrs[] = {
&md_level.attr,
&md_raid_disks.attr,
+ NULL,
+};
+
+static struct attribute *md_redundancy_attrs[] = {
&md_scan_mode.attr,
&md_mismatches.attr,
NULL,
};
+static struct attribute_group md_redundancy_group = {
+ .name = NULL,
+ .attrs = md_redundancy_attrs,
+};
+
static ssize_t
md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
+ ssize_t rv;
if (!entry->show)
return -EIO;
- return entry->show(mddev, page);
+ mddev_lock(mddev);
+ rv = entry->show(mddev, page);
+ mddev_unlock(mddev);
+ return rv;
}
static ssize_t
{
struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
+ ssize_t rv;
if (!entry->store)
return -EIO;
- return entry->store(mddev, page, length);
+ mddev_lock(mddev);
+ rv = entry->store(mddev, page, length);
+ mddev_unlock(mddev);
+ return rv;
}
static void md_free(struct kobject *ko)
mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
mddev->barriers_work = 1;
+ if (start_readonly)
+ mddev->ro = 2; /* read-only, but switch on first write */
+
/* before we start the array running, initialise the bitmap */
err = bitmap_create(mddev);
if (err)
bitmap_destroy(mddev);
return err;
}
+ if (mddev->pers->sync_request)
+ sysfs_create_group(&mddev->kobj, &md_redundancy_group);
+ else if (mddev->ro == 2) /* auto-readonly not meaningful */
+ mddev->ro = 0;
+
atomic_set(&mddev->writes_pending,0);
mddev->safemode = 0;
mddev->safemode_timer.function = md_safemode_timeout;
if (ro) {
err = -ENXIO;
- if (mddev->ro)
+ if (mddev->ro==1)
goto out;
mddev->ro = 1;
} else {
set_disk_ro(disk, 0);
blk_queue_make_request(mddev->queue, md_fail_request);
mddev->pers->stop(mddev);
+ if (mddev->pers->sync_request)
+ sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
+
module_put(mddev->pers->owner);
mddev->pers = NULL;
if (mddev->ro)
mddev->sb_dirty = 1;
+ mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
+ mddev->bitmap_offset = 0;
+
/*
* Generate a 128 bit UUID
*/
if (cnt > 0 ) {
printk(KERN_WARNING
"md: %s(pid %d) used deprecated START_ARRAY ioctl. "
- "This will not be supported beyond 2.6\n",
+ "This will not be supported beyond July 2006\n",
current->comm, current->pid);
cnt--;
}
/*
* The remaining ioctls are changing the state of the
- * superblock, so we do not allow read-only arrays
- * here:
+ * superblock, so we do not allow them on read-only arrays.
+ * However non-MD ioctls (e.g. get-size) will still come through
+ * here and hit the 'default' below, so only disallow
+ * 'md' ioctls, and switch to rw mode if started auto-readonly.
*/
- if (mddev->ro) {
- err = -EROFS;
- goto abort_unlock;
+ if (_IOC_TYPE(cmd) == MD_MAJOR &&
+ mddev->ro && mddev->pers) {
+ if (mddev->ro == 2) {
+ mddev->ro = 0;
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ md_wakeup_thread(mddev->thread);
+
+ } else {
+ err = -EROFS;
+ goto abort_unlock;
+ }
}
switch (cmd)
*/
allow_signal(SIGKILL);
- complete(thread->event);
while (!kthread_should_stop()) {
- void (*run)(mddev_t *);
- wait_event_interruptible_timeout(thread->wqueue,
- test_bit(THREAD_WAKEUP, &thread->flags)
- || kthread_should_stop(),
- thread->timeout);
+ /* We need to wait INTERRUPTIBLE so that
+ * we don't add to the load-average.
+ * That means we need to be sure no signals are
+ * pending
+ */
+ if (signal_pending(current))
+ flush_signals(current);
+
+ wait_event_interruptible_timeout
+ (thread->wqueue,
+ test_bit(THREAD_WAKEUP, &thread->flags)
+ || kthread_should_stop(),
+ thread->timeout);
try_to_freeze();
clear_bit(THREAD_WAKEUP, &thread->flags);
- run = thread->run;
- if (run)
- run(thread->mddev);
+ thread->run(thread->mddev);
}
return 0;
const char *name)
{
mdk_thread_t *thread;
- struct completion event;
thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL);
if (!thread)
memset(thread, 0, sizeof(mdk_thread_t));
init_waitqueue_head(&thread->wqueue);
- init_completion(&event);
- thread->event = &event;
thread->run = run;
thread->mddev = mddev;
- thread->name = name;
thread->timeout = MAX_SCHEDULE_TIMEOUT;
thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
if (IS_ERR(thread->tsk)) {
kfree(thread);
return NULL;
}
- wait_for_completion(&event);
return thread;
}
seq_printf(seq, "%s : %sactive", mdname(mddev),
mddev->pers ? "" : "in");
if (mddev->pers) {
- if (mddev->ro)
+ if (mddev->ro==1)
seq_printf(seq, " (read-only)");
+ if (mddev->ro==2)
+ seq_printf(seq, "(auto-read-only)");
seq_printf(seq, " %s", mddev->pers->name);
}
if (mddev->pers) {
mddev->pers->status (seq, mddev);
seq_printf(seq, "\n ");
- if (mddev->curr_resync > 2) {
- status_resync (seq, mddev);
- seq_printf(seq, "\n ");
- } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
- seq_printf(seq, " resync=DELAYED\n ");
+ if (mddev->pers->sync_request) {
+ if (mddev->curr_resync > 2) {
+ status_resync (seq, mddev);
+ seq_printf(seq, "\n ");
+ } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
+ seq_printf(seq, "\tresync=DELAYED\n ");
+ else if (mddev->recovery_cp < MaxSector)
+ seq_printf(seq, "\tresync=PENDING\n ");
+ }
} else
seq_printf(seq, "\n ");
curr_events = disk_stat_read(disk, sectors[0]) +
disk_stat_read(disk, sectors[1]) -
atomic_read(&disk->sync_io);
- /* Allow some slack between valud of curr_events and last_events,
- * as there are some uninteresting races.
+ /* The difference between curr_events and last_events
+ * will be affected by any new non-sync IO (making
+ * curr_events bigger) and any difference in the amount of
+ * in-flight syncio (making current_events bigger or smaller)
+ * The amount in-flight is currently limited to
+ * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
+ * which is at most 4096 sectors.
+ * These numbers are fairly fragile and should be made
+ * more robust, probably by enforcing the
+ * 'window size' that md_do_sync sort-of uses.
+ *
* Note: the following is an unsigned comparison.
*/
- if ((curr_events - rdev->last_events + 32) > 64) {
+ if ((curr_events - rdev->last_events + 4096) > 8192) {
rdev->last_events = curr_events;
idle = 0;
}
if (bio_data_dir(bi) != WRITE)
return;
+ BUG_ON(mddev->ro == 1);
+ if (mddev->ro == 2) {
+ /* need to switch to read/write */
+ mddev->ro = 0;
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ md_wakeup_thread(mddev->thread);
+ }
atomic_inc(&mddev->writes_pending);
if (mddev->in_sync) {
spin_lock_irq(&mddev->write_lock);
mddev->curr_resync = 2;
try_again:
- if (signal_pending(current) ||
- kthread_should_stop()) {
- flush_signals(current);
+ if (kthread_should_stop()) {
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
goto skip;
}
* time 'round when curr_resync == 2
*/
continue;
- prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
- if (!signal_pending(current) &&
- !kthread_should_stop() &&
+ prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
+ if (!kthread_should_stop() &&
mddev2->curr_resync >= mddev->curr_resync) {
printk(KERN_INFO "md: delaying resync of %s"
" until %s has finished resync (they"
}
- if (signal_pending(current) || kthread_should_stop()) {
+ if (kthread_should_stop()) {
/*
* got a signal, exit.
*/
printk(KERN_INFO
"md: md_do_sync() got signal ... exiting\n");
- flush_signals(current);
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
goto out;
}
if (currspeed > sysctl_speed_limit_min) {
if ((currspeed > sysctl_speed_limit_max) ||
!is_mddev_idle(mddev)) {
- msleep_interruptible(250);
+ msleep(500);
goto repeat;
}
}
module_init(md_init)
module_exit(md_exit)
+static int get_ro(char *buffer, struct kernel_param *kp)
+{
+ return sprintf(buffer, "%d", start_readonly);
+}
+static int set_ro(const char *val, struct kernel_param *kp)
+{
+ char *e;
+ int num = simple_strtoul(val, &e, 10);
+ if (*val && (*e == '\0' || *e == '\n')) {
+ start_readonly = num;
+ return 0;;
+ }
+ return -EINVAL;
+}
+
+module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
+
EXPORT_SYMBOL(register_md_personality);
EXPORT_SYMBOL(unregister_md_personality);
EXPORT_SYMBOL(md_error);
projects / deliverable / linux.git / blobdiff