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| author | Yan, Zheng <zyan@redhat.com> | 2016-01-07 17:32:54 +0800 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2016-03-25 18:51:43 +0100 |
| commit | 2c63f49a724a10bb71cc0fd34f8e5acce78525d5 (patch) | |
| tree | 89e28fde957db2d813d69c2f96a0934bdb455941 /net/ceph | |
| parent | 3f1af42ad0fad8a12242233dd0d9fc42f5e83415 (diff) | |
| download | linux-2c63f49a724a10bb71cc0fd34f8e5acce78525d5.tar.gz linux-2c63f49a724a10bb71cc0fd34f8e5acce78525d5.tar.bz2 linux-2c63f49a724a10bb71cc0fd34f8e5acce78525d5.zip | |
libceph: add helper that duplicates last extent operation
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>
Diffstat (limited to 'net/ceph')
| -rw-r--r-- | net/ceph/osd_client.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index ccd4e031fa3f..32355d9d0103 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -534,6 +534,28 @@ void osd_req_op_extent_update(struct ceph_osd_request *osd_req, } EXPORT_SYMBOL(osd_req_op_extent_update); +void osd_req_op_extent_dup_last(struct ceph_osd_request *osd_req, + unsigned int which, u64 offset_inc) +{ + struct ceph_osd_req_op *op, *prev_op; + + BUG_ON(which + 1 >= osd_req->r_num_ops); + + prev_op = &osd_req->r_ops[which]; + op = _osd_req_op_init(osd_req, which + 1, prev_op->op, prev_op->flags); + /* dup previous one */ + op->indata_len = prev_op->indata_len; + op->outdata_len = prev_op->outdata_len; + op->extent = prev_op->extent; + /* adjust offset */ + op->extent.offset += offset_inc; + op->extent.length -= offset_inc; + + if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL) + op->indata_len -= offset_inc; +} +EXPORT_SYMBOL(osd_req_op_extent_dup_last); + void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which, u16 opcode, const char *class, const char *method) { |