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authorYan, Zheng <zyan@redhat.com>2016-01-07 17:32:54 +0800
committerIlya Dryomov <idryomov@gmail.com>2016-03-25 18:51:43 +0100
commit2c63f49a724a10bb71cc0fd34f8e5acce78525d5 (patch)
tree89e28fde957db2d813d69c2f96a0934bdb455941 /net
parent3f1af42ad0fad8a12242233dd0d9fc42f5e83415 (diff)
downloadlinux-2c63f49a724a10bb71cc0fd34f8e5acce78525d5.tar.bz2
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')
-rw-r--r--net/ceph/osd_client.c22
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)
{