diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2009-12-10 23:52:13 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-12-10 23:52:13 +0000 |
| commit | 9ca170a3c0cbb0d5251cef6f5a3300fa436ba8ec (patch) | |
| tree | 78c023bd85bcbf01b5e81ae9586093aabe201312 /block/compat_ioctl.c | |
| parent | c26655ca3ca7550740a63820ee981e5c7c797523 (diff) | |
| download | kernel_samsung_smdk4412-9ca170a3c0cbb0d5251cef6f5a3300fa436ba8ec.zip kernel_samsung_smdk4412-9ca170a3c0cbb0d5251cef6f5a3300fa436ba8ec.tar.gz kernel_samsung_smdk4412-9ca170a3c0cbb0d5251cef6f5a3300fa436ba8ec.tar.bz2 | |
dm kcopyd: accept zero size jobs
dm-kcopyd: accept zero-size jobs
This patch changes dm-kcopyd so that it accepts zero-size jobs and completes
them immediatelly via its completion thread.
It is needed for multisnapshots snapshot resizing. When we are writing to
a chunk beyond origin end, no copying is done. To simplify the code, we submit
an empty request to kcopyd and let kcopyd complete it. If we didn't submit
a request to kcopyd and called the completion routine immediatelly, it would
violate the principle that completion is called only from one thread and
it would need additional locking.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'block/compat_ioctl.c')
0 files changed, 0 insertions, 0 deletions