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path: root/drivers/md/md.c
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Diffstat (limited to 'drivers/md/md.c')
-rw-r--r--drivers/md/md.c121
1 files changed, 97 insertions, 24 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 87620b705bee..83eb78b00137 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -276,13 +276,15 @@ static mddev_t * mddev_find(dev_t unit)
init_waitqueue_head(&new->sb_wait);
new->reshape_position = MaxSector;
new->resync_max = MaxSector;
+ new->level = LEVEL_NONE;
new->queue = blk_alloc_queue(GFP_KERNEL);
if (!new->queue) {
kfree(new);
return NULL;
}
- set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
+ /* Can be unlocked because the queue is new: no concurrency */
+ queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, new->queue);
blk_queue_make_request(new->queue, md_fail_request);
@@ -1368,6 +1370,11 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
MD_BUG();
return -EINVAL;
}
+
+ /* prevent duplicates */
+ if (find_rdev(mddev, rdev->bdev->bd_dev))
+ return -EEXIST;
+
/* make sure rdev->size exceeds mddev->size */
if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
if (mddev->pers) {
@@ -1651,6 +1658,8 @@ static void md_update_sb(mddev_t * mddev, int force_change)
int sync_req;
int nospares = 0;
+ if (mddev->external)
+ return;
repeat:
spin_lock_irq(&mddev->write_lock);
@@ -1819,6 +1828,10 @@ state_show(mdk_rdev_t *rdev, char *page)
len += sprintf(page+len, "%swrite_mostly",sep);
sep = ",";
}
+ if (test_bit(Blocked, &rdev->flags)) {
+ len += sprintf(page+len, "%sblocked", sep);
+ sep = ",";
+ }
if (!test_bit(Faulty, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags)) {
len += sprintf(page+len, "%sspare", sep);
@@ -1835,6 +1848,8 @@ state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
* remove - disconnects the device
* writemostly - sets write_mostly
* -writemostly - clears write_mostly
+ * blocked - sets the Blocked flag
+ * -blocked - clears the Blocked flag
*/
int err = -EINVAL;
if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
@@ -1857,6 +1872,16 @@ state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
} else if (cmd_match(buf, "-writemostly")) {
clear_bit(WriteMostly, &rdev->flags);
err = 0;
+ } else if (cmd_match(buf, "blocked")) {
+ set_bit(Blocked, &rdev->flags);
+ err = 0;
+ } else if (cmd_match(buf, "-blocked")) {
+ clear_bit(Blocked, &rdev->flags);
+ wake_up(&rdev->blocked_wait);
+ set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
+ md_wakeup_thread(rdev->mddev->thread);
+
+ err = 0;
}
return err ? err : len;
}
@@ -2096,7 +2121,7 @@ rdev_attr_store(struct kobject *kobj, struct attribute *attr,
rv = -EBUSY;
else
rv = entry->store(rdev, page, length);
- mddev_unlock(rdev->mddev);
+ mddev_unlock(mddev);
}
return rv;
}
@@ -2185,7 +2210,9 @@ static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_mi
goto abort_free;
}
}
+
INIT_LIST_HEAD(&rdev->same_set);
+ init_waitqueue_head(&rdev->blocked_wait);
return rdev;
@@ -2456,7 +2483,6 @@ resync_start_show(mddev_t *mddev, char *page)
static ssize_t
resync_start_store(mddev_t *mddev, const char *buf, size_t len)
{
- /* can only set chunk_size if array is not yet active */
char *e;
unsigned long long n = simple_strtoull(buf, &e, 10);
@@ -2590,15 +2616,20 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
err = do_md_stop(mddev, 1);
else {
mddev->ro = 1;
+ set_disk_ro(mddev->gendisk, 1);
err = do_md_run(mddev);
}
break;
case read_auto:
- /* stopping an active array */
if (mddev->pers) {
- err = do_md_stop(mddev, 1);
- if (err == 0)
- mddev->ro = 2; /* FIXME mark devices writable */
+ if (mddev->ro != 1)
+ err = do_md_stop(mddev, 1);
+ else
+ err = restart_array(mddev);
+ if (err == 0) {
+ mddev->ro = 2;
+ set_disk_ro(mddev->gendisk, 0);
+ }
} else {
mddev->ro = 2;
err = do_md_run(mddev);
@@ -2611,6 +2642,8 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
if (atomic_read(&mddev->writes_pending) == 0) {
if (mddev->in_sync == 0) {
mddev->in_sync = 1;
+ if (mddev->safemode == 1)
+ mddev->safemode = 0;
if (mddev->persistent)
set_bit(MD_CHANGE_CLEAN,
&mddev->flags);
@@ -2634,6 +2667,7 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
err = 0;
} else {
mddev->ro = 0;
+ set_disk_ro(mddev->gendisk, 0);
err = do_md_run(mddev);
}
break;
@@ -3711,6 +3745,30 @@ static int do_md_stop(mddev_t * mddev, int mode)
mddev->reshape_position = MaxSector;
mddev->external = 0;
mddev->persistent = 0;
+ mddev->level = LEVEL_NONE;
+ mddev->clevel[0] = 0;
+ mddev->flags = 0;
+ mddev->ro = 0;
+ mddev->metadata_type[0] = 0;
+ mddev->chunk_size = 0;
+ mddev->ctime = mddev->utime = 0;
+ mddev->layout = 0;
+ mddev->max_disks = 0;
+ mddev->events = 0;
+ mddev->delta_disks = 0;
+ mddev->new_level = LEVEL_NONE;
+ mddev->new_layout = 0;
+ mddev->new_chunk = 0;
+ mddev->curr_resync = 0;
+ mddev->resync_mismatches = 0;
+ mddev->suspend_lo = mddev->suspend_hi = 0;
+ mddev->sync_speed_min = mddev->sync_speed_max = 0;
+ mddev->recovery = 0;
+ mddev->in_sync = 0;
+ mddev->changed = 0;
+ mddev->degraded = 0;
+ mddev->barriers_work = 0;
+ mddev->safemode = 0;
} else if (mddev->pers)
printk(KERN_INFO "md: %s switched to read-only mode.\n",
@@ -4918,6 +4976,9 @@ void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
if (!rdev || test_bit(Faulty, &rdev->flags))
return;
+
+ if (mddev->external)
+ set_bit(Blocked, &rdev->flags);
/*
dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
mdname(mddev),
@@ -5364,6 +5425,8 @@ void md_write_start(mddev_t *mddev, struct bio *bi)
md_wakeup_thread(mddev->sync_thread);
}
atomic_inc(&mddev->writes_pending);
+ if (mddev->safemode == 1)
+ mddev->safemode = 0;
if (mddev->in_sync) {
spin_lock_irq(&mddev->write_lock);
if (mddev->in_sync) {
@@ -5718,7 +5781,7 @@ static int remove_and_add_spares(mddev_t *mddev)
rdev_for_each(rdev, rtmp, mddev)
if (rdev->raid_disk >= 0 &&
- !mddev->external &&
+ !test_bit(Blocked, &rdev->flags) &&
(test_bit(Faulty, &rdev->flags) ||
! test_bit(In_sync, &rdev->flags)) &&
atomic_read(&rdev->nr_pending)==0) {
@@ -5788,7 +5851,7 @@ void md_check_recovery(mddev_t *mddev)
return;
if (signal_pending(current)) {
- if (mddev->pers->sync_request) {
+ if (mddev->pers->sync_request && !mddev->external) {
printk(KERN_INFO "md: %s in immediate safe mode\n",
mdname(mddev));
mddev->safemode = 2;
@@ -5800,7 +5863,7 @@ void md_check_recovery(mddev_t *mddev)
(mddev->flags && !mddev->external) ||
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
- (mddev->safemode == 1) ||
+ (mddev->external == 0 && mddev->safemode == 1) ||
(mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
&& !mddev->in_sync && mddev->recovery_cp == MaxSector)
))
@@ -5809,16 +5872,20 @@ void md_check_recovery(mddev_t *mddev)
if (mddev_trylock(mddev)) {
int spares = 0;
- spin_lock_irq(&mddev->write_lock);
- if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
- !mddev->in_sync && mddev->recovery_cp == MaxSector) {
- mddev->in_sync = 1;
- if (mddev->persistent)
- set_bit(MD_CHANGE_CLEAN, &mddev->flags);
+ if (!mddev->external) {
+ spin_lock_irq(&mddev->write_lock);
+ if (mddev->safemode &&
+ !atomic_read(&mddev->writes_pending) &&
+ !mddev->in_sync &&
+ mddev->recovery_cp == MaxSector) {
+ mddev->in_sync = 1;
+ if (mddev->persistent)
+ set_bit(MD_CHANGE_CLEAN, &mddev->flags);
+ }
+ if (mddev->safemode == 1)
+ mddev->safemode = 0;
+ spin_unlock_irq(&mddev->write_lock);
}
- if (mddev->safemode == 1)
- mddev->safemode = 0;
- spin_unlock_irq(&mddev->write_lock);
if (mddev->flags)
md_update_sb(mddev, 0);
@@ -5913,6 +5980,16 @@ void md_check_recovery(mddev_t *mddev)
}
}
+void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
+{
+ sysfs_notify(&rdev->kobj, NULL, "state");
+ wait_event_timeout(rdev->blocked_wait,
+ !test_bit(Blocked, &rdev->flags),
+ msecs_to_jiffies(5000));
+ rdev_dec_pending(rdev, mddev);
+}
+EXPORT_SYMBOL(md_wait_for_blocked_rdev);
+
static int md_notify_reboot(struct notifier_block *this,
unsigned long code, void *x)
{
@@ -5947,13 +6024,9 @@ static struct notifier_block md_notifier = {
static void md_geninit(void)
{
- struct proc_dir_entry *p;
-
dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
- p = create_proc_entry("mdstat", S_IRUGO, NULL);
- if (p)
- p->proc_fops = &md_seq_fops;
+ proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
}
static int __init md_init(void)
generated by cgit v1.2.3 (git 2.0.4) at 2024-12-28 20:41:31 +0000