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| author | Philipp Reisner <philipp.reisner@linbit.com> | 2013-06-25 16:50:08 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2013-06-28 16:04:36 +0200 |
| commit | d752b2696072ed52fd5afab08b601e2220a3b87e (patch) | |
| tree | a6a88c4af1c6e82575d58a68651f0156431d5c09 /drivers/block/drbd/drbd_int.h | |
| parent | e96c96333fe5a4f252cc4e1d7edde8ee7dce7dfe (diff) | |
| download | linux-d752b2696072ed52fd5afab08b601e2220a3b87e.tar.gz linux-d752b2696072ed52fd5afab08b601e2220a3b87e.tar.bz2 linux-d752b2696072ed52fd5afab08b601e2220a3b87e.zip | |
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_int.h')
| -rw-r--r-- | drivers/block/drbd/drbd_int.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index 4519d63350fb..2d7f608d181c 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -1133,6 +1133,7 @@ extern void drbd_mdev_cleanup(struct drbd_conf *mdev); void drbd_print_uuids(struct drbd_conf *mdev, const char *text); extern void conn_md_sync(struct drbd_tconn *tconn); +extern void drbd_md_write(struct drbd_conf *mdev, void *buffer); extern void drbd_md_sync(struct drbd_conf *mdev); extern int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev); extern void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local); @@ -1468,12 +1469,15 @@ extern void drbd_resume_io(struct drbd_conf *mdev); extern char *ppsize(char *buf, unsigned long long size); extern sector_t drbd_new_dev_size(struct drbd_conf *, struct drbd_backing_dev *, sector_t, int); enum determine_dev_size { + DS_ERROR_SHRINK = -3, + DS_ERROR_SPACE_MD = -2, DS_ERROR = -1, DS_UNCHANGED = 0, DS_SHRUNK = 1, DS_GREW = 2 }; -extern enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *, enum dds_flags) __must_hold(local); +extern enum determine_dev_size +drbd_determine_dev_size(struct drbd_conf *, enum dds_flags, struct resize_parms *) __must_hold(local); extern void resync_after_online_grow(struct drbd_conf *); extern void drbd_reconsider_max_bio_size(struct drbd_conf *mdev); extern enum drbd_state_rv drbd_set_role(struct drbd_conf *mdev, @@ -1639,6 +1643,7 @@ extern int __drbd_set_out_of_sync(struct drbd_conf *mdev, sector_t sector, #define drbd_set_out_of_sync(mdev, sector, size) \ __drbd_set_out_of_sync(mdev, sector, size, __FILE__, __LINE__) extern void drbd_al_shrink(struct drbd_conf *mdev); +extern int drbd_initialize_al(struct drbd_conf *, void *); /* drbd_nl.c */ /* state info broadcast */ |