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authorPhilipp Reisner <philipp.reisner@linbit.com>2013-06-25 18:50:08 +0400
committerJens Axboe <axboe@kernel.dk>2013-06-28 18:04:36 +0400
commitd752b2696072ed52fd5afab08b601e2220a3b87e (patch)
treea6a88c4af1c6e82575d58a68651f0156431d5c09 /include/linux/drbd_genl.h
parente96c96333fe5a4f252cc4e1d7edde8ee7dce7dfe (diff)
downloadlinux-d752b2696072ed52fd5afab08b601e2220a3b87e.tar.xz
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 'include/linux/drbd_genl.h')
-rw-r--r--include/linux/drbd_genl.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/drbd_genl.h b/include/linux/drbd_genl.h
index d0d8fac8a6e4..e8c44572b8cb 100644
--- a/include/linux/drbd_genl.h
+++ b/include/linux/drbd_genl.h
@@ -181,6 +181,8 @@ GENL_struct(DRBD_NLA_RESIZE_PARMS, 7, resize_parms,
__u64_field(1, DRBD_GENLA_F_MANDATORY, resize_size)
__flg_field(2, DRBD_GENLA_F_MANDATORY, resize_force)
__flg_field(3, DRBD_GENLA_F_MANDATORY, no_resync)
+ __u32_field_def(4, 0 /* OPTIONAL */, al_stripes, DRBD_AL_STRIPES_DEF)
+ __u32_field_def(5, 0 /* OPTIONAL */, al_stripe_size, DRBD_AL_STRIPE_SIZE_DEF)
)
GENL_struct(DRBD_NLA_STATE_INFO, 8, state_info,