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[PATCH] md: provide proper rcu_dereference / rcu_assign_pointer annotations in md

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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>
This commit is contained in:
Suzanne Wood
2005-11-08 21:39:27 -08:00
committed by Linus Torvalds
parent 9d88883e68
commit d6065f7bf8
5 changed files with 38 additions and 36 deletions
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30
drivers/md/raid10.c
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@@ -496,6 +496,7 @@ static int read_balance(conf_t *conf, r10bio_t *r10_bio)
int disk, slot, nslot;
const int sectors = r10_bio->sectors;
sector_t new_distance, current_distance;
mdk_rdev_t *rdev;
raid10_find_phys(conf, r10_bio);
rcu_read_lock();
@@ -510,8 +511,8 @@ static int read_balance(conf_t *conf, r10bio_t *r10_bio)
slot = 0;
disk = r10_bio->devs[slot].devnum;
while (!conf->mirrors[disk].rdev ||
!conf->mirrors[disk].rdev->in_sync) {
while ((rdev = rcu_dereference(conf->mirrors[disk].rdev)) == NULL ||
!rdev->in_sync) {
slot++;
if (slot == conf->copies) {
slot = 0;
@@ -527,8 +528,8 @@ static int read_balance(conf_t *conf, r10bio_t *r10_bio)
/* make sure the disk is operational */
slot = 0;
disk = r10_bio->devs[slot].devnum;
while (!conf->mirrors[disk].rdev ||
!conf->mirrors[disk].rdev->in_sync) {
while ((rdev=rcu_dereference(conf->mirrors[disk].rdev)) == NULL ||
!rdev->in_sync) {
slot ++;
if (slot == conf->copies) {
disk = -1;
@@ -547,11 +548,11 @@ static int read_balance(conf_t *conf, r10bio_t *r10_bio)
int ndisk = r10_bio->devs[nslot].devnum;
if (!conf->mirrors[ndisk].rdev ||
!conf->mirrors[ndisk].rdev->in_sync)
if ((rdev=rcu_dereference(conf->mirrors[ndisk].rdev)) == NULL ||
!rdev->in_sync)
continue;
if (!atomic_read(&conf->mirrors[ndisk].rdev->nr_pending)) {
if (!atomic_read(&rdev->nr_pending)) {
disk = ndisk;
slot = nslot;
break;
@@ -569,7 +570,7 @@ rb_out:
r10_bio->read_slot = slot;
/* conf->next_seq_sect = this_sector + sectors;*/
if (disk >= 0 && conf->mirrors[disk].rdev)
if (disk >= 0 && (rdev=rcu_dereference(conf->mirrors[disk].rdev))!= NULL)
atomic_inc(&conf->mirrors[disk].rdev->nr_pending);
rcu_read_unlock();
@@ -583,7 +584,7 @@ static void unplug_slaves(mddev_t *mddev)
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);
@@ -614,7 +615,7 @@ static int raid10_issue_flush(request_queue_t *q, struct gendisk *disk,
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);
@@ -768,9 +769,10 @@ static int make_request(request_queue_t *q, struct bio * bio)
rcu_read_lock();
for (i = 0; i < conf->copies; i++) {
int d = r10_bio->devs[i].devnum;
if (conf->mirrors[d].rdev &&
!conf->mirrors[d].rdev->faulty) {
atomic_inc(&conf->mirrors[d].rdev->nr_pending);
mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[d].rdev);
if (rdev &&
!rdev->faulty) {
atomic_inc(&rdev->nr_pending);
r10_bio->devs[i].bio = bio;
} else
r10_bio->devs[i].bio = NULL;
@@ -980,7 +982,7 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
p->head_position = 0;
rdev->raid_disk = mirror;
found = 1;
p->rdev = rdev;
rcu_assign_pointer(p->rdev, rdev);
break;
}