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libceph: add helper that duplicates last extent operation

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This helper duplicates last extent operation in OSD request, then
adjusts the new extent operation's offset and length. The helper
is for scatterd page writeback, which adds nonconsecutive dirty
pages to single OSD request.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng
2016-01-07 17:32:54 +08:00
committed by Ilya Dryomov
parent 3f1af42ad0
commit 2c63f49a72
2 changed files with 24 additions and 0 deletions
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include/linux/ceph/osd_client.h
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@@ -266,6 +266,8 @@ extern void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
u64 truncate_size, u32 truncate_seq);
extern void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
unsigned int which, u64 length);
extern void osd_req_op_extent_dup_last(struct ceph_osd_request *osd_req,
unsigned int which, u64 offset_inc);
extern struct ceph_osd_data *osd_req_op_extent_osd_data(
struct ceph_osd_request *osd_req,