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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_limits.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_limits.h')
-rw-r--r--include/linux/drbd_limits.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h
index 1fedf2b17cc8..17e50bb00521 100644
--- a/include/linux/drbd_limits.h
+++ b/include/linux/drbd_limits.h
@@ -215,4 +215,13 @@
#define DRBD_ALWAYS_ASBP_DEF 0
#define DRBD_USE_RLE_DEF 1
+#define DRBD_AL_STRIPES_MIN 1
+#define DRBD_AL_STRIPES_MAX 1024
+#define DRBD_AL_STRIPES_DEF 1
+#define DRBD_AL_STRIPES_SCALE '1'
+
+#define DRBD_AL_STRIPE_SIZE_MIN 4
+#define DRBD_AL_STRIPE_SIZE_MAX 16777216
+#define DRBD_AL_STRIPE_SIZE_DEF 32
+#define DRBD_AL_STRIPE_SIZE_SCALE 'k' /* kilobytes */
#endif