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authorAlex Elder <elder@inktank.com>2013-03-08 23:35:36 +0400
committerSage Weil <sage@inktank.com>2013-05-02 08:17:02 +0400
commit175face2ba31025b0dcd6da4e711fca7764287fa (patch)
tree8da146e3a923614defe47d78e0e262a1671b7f1a /include/linux/ceph
parente766d7b55e10f93c7bab298135a4e90dcc46620d (diff)
downloadlinux-175face2ba31025b0dcd6da4e711fca7764287fa.tar.xz
libceph: let osd ops determine request data length
The length of outgoing data in an osd request is dependent on the osd ops that are embedded in that request. Each op is encoded into a request message using osd_req_encode_op(), so that should be used to determine the amount of outgoing data implied by the op as it is encoded. Have osd_req_encode_op() return the number of bytes of outgoing data implied by the op being encoded, and accumulate and use that in ceph_osdc_build_request(). As a result, ceph_osdc_build_request() no longer requires its "len" parameter, so get rid of it. Using the sum of the op lengths rather than the length provided is a valid change because: - The only callers of osd ceph_osdc_build_request() are rbd and the osd client (in ceph_osdc_new_request() on behalf of the file system). - When rbd calls it, the length provided is only non-zero for write requests, and in that case the single op has the same length value as what was passed here. - When called from ceph_osdc_new_request(), (it's not all that easy to see, but) the length passed is also always the same as the extent length encoded in its (single) write op if present. This resolves: http://tracker.ceph.com/issues/4406 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Diffstat (limited to 'include/linux/ceph')
-rw-r--r--include/linux/ceph/osd_client.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h
index a8016dfbfdba..bcf3f72ec3f8 100644
--- a/include/linux/ceph/osd_client.h
+++ b/include/linux/ceph/osd_client.h
@@ -249,8 +249,7 @@ extern struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *
bool use_mempool,
gfp_t gfp_flags);
-extern void ceph_osdc_build_request(struct ceph_osd_request *req,
- u64 off, u64 len,
+extern void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
unsigned int num_op,
struct ceph_osd_req_op *src_ops,
struct ceph_snap_context *snapc,