diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2011-10-31 20:18:58 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2011-10-31 20:18:58 +0000 |
| commit | 7f06965390e4a10fb6906c886324bfd0a96961be (patch) | |
| tree | 5a6fd96cd56fb9d80bf1a40110ebfcdb5a8a7aa3 /include/linux | |
| parent | fbdc86f3bd597e108fa03d998132d04fcfe1d669 (diff) | |
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')
| -rw-r--r-- | include/linux/dm-kcopyd.h | 4 |
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 */ |