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authorDamien Le Moal <damien.lemoal@wdc.com>2017-05-09 02:40:51 +0300
committerMike Snitzer <snitzer@redhat.com>2017-06-19 18:03:51 +0300
commitb73c67c2cbb0004e6da9720a167fe42e31f7a6e8 (patch)
treedd685152cb1e9264eed978ef63f13b272705fa61 /include/linux/dm-kcopyd.h
parent0be12c1c7fce7e0f464861a7752d489860c376f9 (diff)
downloadlinux-b73c67c2cbb0004e6da9720a167fe42e31f7a6e8.tar.xz
dm kcopyd: add sequential write feature
When copyying blocks to host-managed zoned block devices, writes must be sequential. However, dm_kcopyd_copy() does not guarantee this as writes are issued in the completion order of reads, and reads may complete out of order despite being issued sequentially. Fix this by introducing the DM_KCOPYD_WRITE_SEQ feature flag. This can be specified when calling dm_kcopyd_copy() and should be set automatically if one of the destinations is a host-managed zoned block device. For a split job, the master job maintains the write position at which writes must be issued. This is checked with the pop() function which is modified to not return any write I/O sub job that is not at the correct write position. When DM_KCOPYD_WRITE_SEQ is specified for a job, errors cannot be ignored and the flag DM_KCOPYD_IGNORE_ERROR is ignored, even if specified by the user. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'include/linux/dm-kcopyd.h')
-rw-r--r--include/linux/dm-kcopyd.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/dm-kcopyd.h b/include/linux/dm-kcopyd.h
index f486d636b82e..cfac8588ed56 100644
--- a/include/linux/dm-kcopyd.h
+++ b/include/linux/dm-kcopyd.h
@@ -20,6 +20,7 @@
#define DM_KCOPYD_MAX_REGIONS 8
#define DM_KCOPYD_IGNORE_ERROR 1
+#define DM_KCOPYD_WRITE_SEQ 2
struct dm_kcopyd_throttle {
unsigned throttle;