[PATCH] md: provide proper rcu_dereference / rcu_assign_pointer annotations in md
Acked-by: <paulmck@us.ibm.com>
Signed-off-by: Suzanne Wood <suzannew@cs.pdx.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index e16f473..f12fc28 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -416,10 +416,10 @@
/* Choose the first operation device, for consistancy */
new_disk = 0;
- for (rdev = conf->mirrors[new_disk].rdev;
+ for (rdev = rcu_dereference(conf->mirrors[new_disk].rdev);
!rdev || !rdev->in_sync
|| test_bit(WriteMostly, &rdev->flags);
- rdev = conf->mirrors[++new_disk].rdev) {
+ rdev = rcu_dereference(conf->mirrors[++new_disk].rdev)) {
if (rdev && rdev->in_sync)
wonly_disk = new_disk;
@@ -434,10 +434,10 @@
/* make sure the disk is operational */
- for (rdev = conf->mirrors[new_disk].rdev;
+ for (rdev = rcu_dereference(conf->mirrors[new_disk].rdev);
!rdev || !rdev->in_sync ||
test_bit(WriteMostly, &rdev->flags);
- rdev = conf->mirrors[new_disk].rdev) {
+ rdev = rcu_dereference(conf->mirrors[new_disk].rdev)) {
if (rdev && rdev->in_sync)
wonly_disk = new_disk;
@@ -474,7 +474,7 @@
disk = conf->raid_disks;
disk--;
- rdev = conf->mirrors[disk].rdev;
+ rdev = rcu_dereference(conf->mirrors[disk].rdev);
if (!rdev ||
!rdev->in_sync ||
@@ -496,7 +496,7 @@
if (new_disk >= 0) {
- rdev = conf->mirrors[new_disk].rdev;
+ rdev = rcu_dereference(conf->mirrors[new_disk].rdev);
if (!rdev)
goto retry;
atomic_inc(&rdev->nr_pending);
@@ -522,7 +522,7 @@
rcu_read_lock();
for (i=0; i<mddev->raid_disks; i++) {
- mdk_rdev_t *rdev = conf->mirrors[i].rdev;
+ mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
if (rdev && !rdev->faulty && atomic_read(&rdev->nr_pending)) {
request_queue_t *r_queue = bdev_get_queue(rdev->bdev);
@@ -556,7 +556,7 @@
rcu_read_lock();
for (i=0; i<mddev->raid_disks && ret == 0; i++) {
- mdk_rdev_t *rdev = conf->mirrors[i].rdev;
+ mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
if (rdev && !rdev->faulty) {
struct block_device *bdev = rdev->bdev;
request_queue_t *r_queue = bdev_get_queue(bdev);
@@ -728,7 +728,7 @@
#endif
rcu_read_lock();
for (i = 0; i < disks; i++) {
- if ((rdev=conf->mirrors[i].rdev) != NULL &&
+ if ((rdev=rcu_dereference(conf->mirrors[i].rdev)) != NULL &&
!rdev->faulty) {
atomic_inc(&rdev->nr_pending);
if (rdev->faulty) {
@@ -954,7 +954,7 @@
found = 1;
if (rdev->saved_raid_disk != mirror)
conf->fullsync = 1;
- p->rdev = rdev;
+ rcu_assign_pointer(p->rdev, rdev);
break;
}
