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drbd: Allow online change of al-stripes and al-stripe-size

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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>
This commit is contained in:
Philipp Reisner
2013-06-25 16:50:08 +02:00
committed by Jens Axboe
parent e96c96333f
commit d752b26960
8 changed files with 188 additions and 53 deletions
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6
include/linux/drbd.h
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@@ -177,7 +177,11 @@ enum drbd_ret_code {
ERR_NEED_APV_100 = 163,
ERR_NEED_ALLOW_TWO_PRI = 164,
ERR_MD_UNCLEAN = 165,
ERR_MD_LAYOUT_CONNECTED = 166,
ERR_MD_LAYOUT_TOO_BIG = 167,
ERR_MD_LAYOUT_TOO_SMALL = 168,
ERR_MD_LAYOUT_NO_FIT = 169,
ERR_IMPLICIT_SHRINK = 170,
/* insert new ones above this line */
AFTER_LAST_ERR_CODE
};