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drbd: Improve compatibility with drbd's older than 8.3.7 

Regression introduced with 8.3.11 commit:
drbd: Take a more conservative approach when deciding max_bio_size

Never ever tell an older drbd, that we support more than 32KiB
in a single data request (packet).
Never believe an older drbd, that is supports more than 32KiB
in a single data request (packet)

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2011-06-30 15:43:06 +02:00
parent 77e8fdfc18
commit 6809384c71
2 changed files with 8 additions and 3 deletions
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4
drivers/block/drbd/drbd_main.c
View File

@ -2112,6 +2112,10 @@ int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags fl
max_bio_size = DRBD_MAX_BIO_SIZE; /* ... multiple BIOs per peer_request */
}
/* Never allow old drbd (up to 8.3.7) to see more than 32KiB */
if (mdev->agreed_pro_version <= 94)
max_bio_size = min_t(int, max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
p.d_size = cpu_to_be64(d_size);
p.u_size = cpu_to_be64(u_size);
p.c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev));

7
drivers/block/drbd/drbd_nl.c
View File

@ -845,9 +845,10 @@ void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
Because new from 8.3.8 onwards the peer can use multiple
BIOs for a single peer_request */
if (mdev->state.conn >= C_CONNECTED) {
if (mdev->agreed_pro_version < 94)
peer = mdev->peer_max_bio_size;
else if (mdev->agreed_pro_version == 94)
if (mdev->agreed_pro_version < 94) {
peer = min_t(int, mdev->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
/* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
} else if (mdev->agreed_pro_version == 94)
peer = DRBD_MAX_SIZE_H80_PACKET;
else /* drbd 8.3.8 onwards */
peer = DRBD_MAX_BIO_SIZE;