diff options
| author | Stefan Haberland <sth@linux.ibm.com> | 2022-09-20 21:26:13 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-09-21 08:32:51 -0600 |
| commit | 413862caad6fe7fddec639219bccfdab60333551 (patch) | |
| tree | 06e12d8e93196e5b96d7182c7a1d4aa0206e3a71 /drivers/s390/block/dasd_devmap.c | |
| parent | a91ff09d39f9b6545254839ac91f1ff7bd21d39e (diff) | |
| download | linux-413862caad6fe7fddec639219bccfdab60333551.tar.gz | |
s390/dasd: add copy pair swap capability
In case of errors or misbehaviour of the primary device a controlled
failover to one of the configured secondary devices needs to be
performed.
The swap processing stops I/O on the primary device, all requests are
re-queued to the blocklayer queue, the entries in the copy relation are
swapped and finally the link to the blockdevice is moved from primary to
secondary dasd device.
After this, the secondary becomes the new primary device and I/O is
restarted on that device.
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Link: https://lore.kernel.org/r/20220920192616.808070-5-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/s390/block/dasd_devmap.c')
| -rw-r--r-- | drivers/s390/block/dasd_devmap.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c index 28c244aa75cf18..ca5c9e96366287 100644 --- a/drivers/s390/block/dasd_devmap.c +++ b/drivers/s390/block/dasd_devmap.c @@ -937,6 +937,7 @@ void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device) gdp->private_data = devmap; spin_unlock(&dasd_devmap_lock); } +EXPORT_SYMBOL(dasd_add_link_to_gendisk); struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp) { |