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authorMikulas Patocka <mpatocka@redhat.com>2011-11-01 00:18:58 +0400
committerAlasdair G Kergon <agk@redhat.com>2011-11-01 00:18:58 +0400
commit7f06965390e4a10fb6906c886324bfd0a96961be (patch)
tree5a6fd96cd56fb9d80bf1a40110ebfcdb5a8a7aa3 /include/linux/dm-kcopyd.h
parentfbdc86f3bd597e108fa03d998132d04fcfe1d669 (diff)
downloadlinux-7f06965390e4a10fb6906c886324bfd0a96961be.tar.xz
dm kcopyd: add dm_kcopyd_zero to zero an area
This patch introduces dm_kcopyd_zero() to make it easy to use kcopyd to write zeros into the requested areas instead instead of copying. It is implemented by passing a NULL copying source to dm_kcopyd_copy(). The forthcoming thin provisioning target uses this. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'include/linux/dm-kcopyd.h')
-rw-r--r--include/linux/dm-kcopyd.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/dm-kcopyd.h b/include/linux/dm-kcopyd.h
index 5e54458e920f..47d9d376e4e7 100644
--- a/include/linux/dm-kcopyd.h
+++ b/include/linux/dm-kcopyd.h
@@ -57,5 +57,9 @@ void *dm_kcopyd_prepare_callback(struct dm_kcopyd_client *kc,
dm_kcopyd_notify_fn fn, void *context);
void dm_kcopyd_do_callback(void *job, int read_err, unsigned long write_err);
+int dm_kcopyd_zero(struct dm_kcopyd_client *kc,
+ unsigned num_dests, struct dm_io_region *dests,
+ unsigned flags, dm_kcopyd_notify_fn fn, void *context);
+
#endif /* __KERNEL__ */
#endif /* _LINUX_DM_KCOPYD_H */