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libceph: let osd ops determine request data length

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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>
This commit is contained in:
Alex Elder 2013-03-08 13:35:36 -06:00 committed by Sage Weil
parent e766d7b55e
commit 175face2ba
3 changed files with 21 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/block/rbd.c
View File

@ -1462,7 +1462,7 @@ static struct ceph_osd_request *rbd_osd_req_create(
/* osd_req will get its own reference to snapc (if non-null) */
ceph_osdc_build_request(osd_req, offset, length, 1, op,
ceph_osdc_build_request(osd_req, offset, 1, op,
snapc, snap_id, mtime);
return osd_req;

3
include/linux/ceph/osd_client.h
View File

@ -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,

33
net/ceph/osd_client.c
View File

@ -222,10 +222,13 @@ struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
}
EXPORT_SYMBOL(ceph_osdc_alloc_request);
static void osd_req_encode_op(struct ceph_osd_request *req,
static u64 osd_req_encode_op(struct ceph_osd_request *req,
struct ceph_osd_op *dst,
struct ceph_osd_req_op *src)
{
u64 out_data_len = 0;
u64 tmp;
dst->op = cpu_to_le16(src->op);
switch (src->op) {
@ -233,10 +236,10 @@ static void osd_req_encode_op(struct ceph_osd_request *req,
break;
case CEPH_OSD_OP_READ:
case CEPH_OSD_OP_WRITE:
dst->extent.offset =
cpu_to_le64(src->extent.offset);
dst->extent.length =
cpu_to_le64(src->extent.length);
if (src->op == CEPH_OSD_OP_WRITE)
out_data_len = src->extent.length;
dst->extent.offset = cpu_to_le64(src->extent.offset);
dst->extent.length = cpu_to_le64(src->extent.length);
dst->extent.truncate_size =
cpu_to_le64(src->extent.truncate_size);
dst->extent.truncate_seq =
@ -247,12 +250,14 @@ static void osd_req_encode_op(struct ceph_osd_request *req,
dst->cls.method_len = src->cls.method_len;
dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
tmp = req->r_trail.length;
ceph_pagelist_append(&req->r_trail, src->cls.class_name,
src->cls.class_len);
ceph_pagelist_append(&req->r_trail, src->cls.method_name,
src->cls.method_len);
ceph_pagelist_append(&req->r_trail, src->cls.indata,
src->cls.indata_len);
out_data_len = req->r_trail.length - tmp;
break;
case CEPH_OSD_OP_STARTSYNC:
break;
@ -326,6 +331,8 @@ static void osd_req_encode_op(struct ceph_osd_request *req,
break;
}
dst->payload_len = cpu_to_le32(src->payload_len);
return out_data_len;
}
/*
@ -333,7 +340,7 @@ static void osd_req_encode_op(struct ceph_osd_request *req,
*
*/
void ceph_osdc_build_request(struct ceph_osd_request *req,
u64 off, u64 len, unsigned int num_ops,
u64 off, unsigned int num_ops,
struct ceph_osd_req_op *src_ops,
struct ceph_snap_context *snapc, u64 snap_id,
struct timespec *mtime)
@ -385,12 +392,13 @@ void ceph_osdc_build_request(struct ceph_osd_request *req,
dout("oid '%.*s' len %d\n", req->r_oid_len, req->r_oid, req->r_oid_len);
p += req->r_oid_len;
/* ops */
/* ops--can imply data */
ceph_encode_16(&p, num_ops);
src_op = src_ops;
req->r_request_ops = p;
data_len = 0;
for (i = 0; i < num_ops; i++, src_op++) {
osd_req_encode_op(req, p, src_op);
data_len += osd_req_encode_op(req, p, src_op);
p += sizeof(struct ceph_osd_op);
}
@ -407,11 +415,9 @@ void ceph_osdc_build_request(struct ceph_osd_request *req,
req->r_request_attempts = p;
p += 4;
data_len = req->r_trail.length;
if (flags & CEPH_OSD_FLAG_WRITE) {
/* data */
if (flags & CEPH_OSD_FLAG_WRITE)
req->r_request->hdr.data_off = cpu_to_le16(off);
data_len += len;
}
req->r_request->hdr.data_len = cpu_to_le32(data_len);
BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
@ -477,13 +483,12 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
ceph_osdc_put_request(req);
return ERR_PTR(r);
}
req->r_file_layout = *layout; /* keep a copy */
snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx", vino.ino, bno);
req->r_oid_len = strlen(req->r_oid);
ceph_osdc_build_request(req, off, *plen, num_op, ops,
ceph_osdc_build_request(req, off, num_op, ops,
snapc, vino.snap, mtime);
return req;