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libceph: make r_request msg_size calculation clearer 

Although msg_size is calculated correctly, the terms are grouped in
a misleading way - snaps appears to not have room for a u32 length.
Move calculation closer to its use and regroup terms.

No functional change.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov 2016-02-11 13:09:15 +01:00
parent 7665d85b73
commit ae458f5a17
1 changed files with 11 additions and 10 deletions
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21
net/ceph/osd_client.c
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@ -372,16 +372,6 @@ struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
BUILD_BUG_ON(CEPH_OSD_MAX_OP > U16_MAX);
BUG_ON(num_ops > CEPH_OSD_MAX_OP);
msg_size = 4 + 4 + 8 + 8 + 4+8;
msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
msg_size += 1 + 8 + 4 + 4; /* pg_t */
msg_size += 4 + CEPH_MAX_OID_NAME_LEN; /* oid */
msg_size += 2 + num_ops*sizeof(struct ceph_osd_op);
msg_size += 8; /* snapid */
msg_size += 8; /* snap_seq */
msg_size += 8 * (snapc ? snapc->num_snaps : 0); /* snaps */
msg_size += 4;
if (use_mempool) {
req = mempool_alloc(osdc->req_mempool, gfp_flags);
memset(req, 0, sizeof(*req));
@ -420,6 +410,17 @@ struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
}
req->r_reply = msg;
msg_size = 4 + 4 + 4; /* client_inc, osdmap_epoch, flags */
msg_size += 4 + 4 + 4 + 8; /* mtime, reassert_version */
msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
msg_size += 1 + 8 + 4 + 4; /* pgid */
msg_size += 4 + CEPH_MAX_OID_NAME_LEN; /* oid */
msg_size += 2 + num_ops * sizeof(struct ceph_osd_op);
msg_size += 8; /* snapid */
msg_size += 8; /* snap_seq */
msg_size += 4 + 8 * (snapc ? snapc->num_snaps : 0); /* snaps */
msg_size += 4; /* retry_attempt */
/* create request message; allow space for oid */
if (use_mempool)
msg = ceph_msgpool_get(&osdc->msgpool_op, 0);