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author | Philipp Reisner <philipp.reisner@linbit.com> | 2013-06-25 16:50:08 +0200 |
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committer | Jens Axboe <axboe@kernel.dk> | 2013-06-28 16:04:36 +0200 |
commit | d752b2696072ed52fd5afab08b601e2220a3b87e (patch) | |
tree | a6a88c4af1c6e82575d58a68651f0156431d5c09 /drivers/block/drbd/drbd_actlog.c | |
parent | e96c96333fe5a4f252cc4e1d7edde8ee7dce7dfe (diff) | |
download | op-kernel-dev-d752b2696072ed52fd5afab08b601e2220a3b87e.zip op-kernel-dev-d752b2696072ed52fd5afab08b601e2220a3b87e.tar.gz |
drbd: Allow online change of al-stripes and al-stripe-size
Allow to change the AL layout with an resize operation. For that
the reisze command gets two new fields: al_stripes and al_stripe_size.
In order to make the operation crash save:
1) Lock out all IO and MD-IO
2) Write the super block with MDF_PRIMARY_IND clear
3) write the bitmap to the new location (all zeros, since
we allow only while connected)
4) Initialize the new AL-area
5) Write the super block with the restored MDF_PRIMARY_IND.
6) Unfreeze all IO
Since the AL-layout has no influence on the protocol, this operation
needs to be beforemed on both sides of a resource (if intended).
Signed-off-by: Andreas Gruenbacher <agruen@linbit.com>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/drbd/drbd_actlog.c')
-rw-r--r-- | drivers/block/drbd/drbd_actlog.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c index 6608076..28c73ca 100644 --- a/drivers/block/drbd/drbd_actlog.c +++ b/drivers/block/drbd/drbd_actlog.c @@ -659,6 +659,27 @@ void drbd_al_shrink(struct drbd_conf *mdev) wake_up(&mdev->al_wait); } +int drbd_initialize_al(struct drbd_conf *mdev, void *buffer) +{ + struct al_transaction_on_disk *al = buffer; + struct drbd_md *md = &mdev->ldev->md; + sector_t al_base = md->md_offset + md->al_offset; + int al_size_4k = md->al_stripes * md->al_stripe_size_4k; + int i; + + memset(al, 0, 4096); + al->magic = cpu_to_be32(DRBD_AL_MAGIC); + al->transaction_type = cpu_to_be16(AL_TR_INITIALIZED); + al->crc32c = cpu_to_be32(crc32c(0, al, 4096)); + + for (i = 0; i < al_size_4k; i++) { + int err = drbd_md_sync_page_io(mdev, mdev->ldev, al_base + i * 8, WRITE); + if (err) + return err; + } + return 0; +} + static int w_update_odbm(struct drbd_work *w, int unused) { struct update_odbm_work *udw = container_of(w, struct update_odbm_work, w); |