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drbd: introduce the "initialized" activity log transaction type 

So we can initialize a clean on disk activity log area,
without the module complaining with loud assert messages
because of checksum or magic value mismatches.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2011-03-31 12:06:48 +02:00 committed by Philipp Reisner
parent 6038178ebe
commit 85f103d88c
1 changed files with 14 additions and 2 deletions
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16
drivers/block/drbd/drbd_actlog.c
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@ -31,6 +31,11 @@
#include "drbd_int.h"
#include "drbd_wrappers.h"
enum al_transaction_types {
AL_TR_UPDATE = 0,
AL_TR_INITIALIZED = 0xffff
};
/* all fields on disc in big endian */
struct __packed al_transaction_on_disk {
/* don't we all like magic */
@ -44,7 +49,8 @@ struct __packed al_transaction_on_disk {
__be32 crc32c;
/* type of transaction, special transaction types like:
* purge-all, set-all-idle, set-all-active, ... to-be-defined */
* purge-all, set-all-idle, set-all-active, ... to-be-defined
* see also enum al_transaction_types */
__be16 transaction_type;
/* we currently allow only a few thousand extents,
@ -476,6 +482,7 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
int active_extents = 0;
int transactions = 0;
int found_valid = 0;
int found_initialized = 0;
int from = 0;
int to = 0;
u32 from_tnr = 0;
@ -504,6 +511,10 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
/* invalid data in that block */
if (rv == 0)
continue;
if (be16_to_cpu(b->transaction_type) == AL_TR_INITIALIZED) {
++found_initialized;
continue;
}
/* IO error */
if (rv == -1) {
@ -535,7 +546,8 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
}
if (!found_valid) {
dev_warn(DEV, "No usable activity log found.\n");
if (found_initialized != mx)
dev_warn(DEV, "No usable activity log found.\n");
mutex_unlock(&mdev->md_io_mutex);
return 1;
}