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authorIlya Dryomov <idryomov@gmail.com>2016-04-28 16:07:24 +0200
committerIlya Dryomov <idryomov@gmail.com>2016-05-26 00:36:28 +0200
commitfe5da05e979830b43b115d8a18ead521d507c783 (patch)
tree6afb8cacfd090d9d3b46a0a9976930957bb2e6cf /net
parent85e084feb47349d62989efe1713a8723af95f4ea (diff)
downloadlinux-sh-fe5da05e979830b43b115d8a18ead521d507c783.tar.gz
libceph: redo callbacks and factor out MOSDOpReply decoding
If you specify ACK | ONDISK and set ->r_unsafe_callback, both ->r_callback and ->r_unsafe_callback(true) are called on ack. This is very confusing. Redo this so that only one of them is called: ->r_unsafe_callback(true), on ack ->r_unsafe_callback(false), on commit or ->r_callback, on ack|commit Decode everything in decode_MOSDOpReply() to reduce clutter. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'net')
-rw-r--r--net/ceph/osd_client.c362
1 files changed, 209 insertions, 153 deletions
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 2a30c0bb3045..baf2844b00d6 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -1693,6 +1693,14 @@ static int __ceph_osdc_start_request(struct ceph_osd_client *osdc,
return 0;
}
+static void __complete_request(struct ceph_osd_request *req)
+{
+ if (req->r_callback)
+ req->r_callback(req);
+ else
+ complete_all(&req->r_completion);
+}
+
/*
* Timeout callback, called every N seconds when 1 or more osd
* requests has been active for more than N seconds. When this
@@ -1875,107 +1883,76 @@ e_inval:
goto out;
}
-static void complete_request(struct ceph_osd_request *req)
-{
- complete_all(&req->r_safe_completion); /* fsync waiter */
-}
+struct MOSDOpReply {
+ struct ceph_pg pgid;
+ u64 flags;
+ int result;
+ u32 epoch;
+ int num_ops;
+ u32 outdata_len[CEPH_OSD_MAX_OPS];
+ s32 rval[CEPH_OSD_MAX_OPS];
+ int retry_attempt;
+ struct ceph_eversion replay_version;
+ u64 user_version;
+ struct ceph_request_redirect redirect;
+};
-/*
- * handle osd op reply. either call the callback if it is specified,
- * or do the completion to wake up the waiting thread.
- */
-static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg)
+static int decode_MOSDOpReply(const struct ceph_msg *msg, struct MOSDOpReply *m)
{
- void *p, *end;
- struct ceph_osd_request *req;
- struct ceph_request_redirect redir;
- u64 tid;
- int object_len;
- unsigned int numops;
- int payload_len, flags;
- s32 result;
- s32 retry_attempt;
- struct ceph_pg pg;
- int err;
- u32 reassert_epoch;
- u64 reassert_version;
- u32 osdmap_epoch;
- int already_completed;
- u32 bytes;
+ void *p = msg->front.iov_base;
+ void *const end = p + msg->front.iov_len;
+ u16 version = le16_to_cpu(msg->hdr.version);
+ struct ceph_eversion bad_replay_version;
u8 decode_redir;
- unsigned int i;
-
- tid = le64_to_cpu(msg->hdr.tid);
- dout("handle_reply %p tid %llu\n", msg, tid);
-
- p = msg->front.iov_base;
- end = p + msg->front.iov_len;
+ u32 len;
+ int ret;
+ int i;
- ceph_decode_need(&p, end, 4, bad);
- object_len = ceph_decode_32(&p);
- ceph_decode_need(&p, end, object_len, bad);
- p += object_len;
+ ceph_decode_32_safe(&p, end, len, e_inval);
+ ceph_decode_need(&p, end, len, e_inval);
+ p += len; /* skip oid */
- err = ceph_decode_pgid(&p, end, &pg);
- if (err)
- goto bad;
+ ret = ceph_decode_pgid(&p, end, &m->pgid);
+ if (ret)
+ return ret;
- ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
- flags = ceph_decode_64(&p);
- result = ceph_decode_32(&p);
- reassert_epoch = ceph_decode_32(&p);
- reassert_version = ceph_decode_64(&p);
- osdmap_epoch = ceph_decode_32(&p);
+ ceph_decode_64_safe(&p, end, m->flags, e_inval);
+ ceph_decode_32_safe(&p, end, m->result, e_inval);
+ ceph_decode_need(&p, end, sizeof(bad_replay_version), e_inval);
+ memcpy(&bad_replay_version, p, sizeof(bad_replay_version));
+ p += sizeof(bad_replay_version);
+ ceph_decode_32_safe(&p, end, m->epoch, e_inval);
- /* lookup */
- down_read(&osdc->map_sem);
- mutex_lock(&osdc->request_mutex);
- req = lookup_request(&osdc->requests, tid);
- if (req == NULL) {
- dout("handle_reply tid %llu dne\n", tid);
- goto bad_mutex;
- }
- ceph_osdc_get_request(req);
+ ceph_decode_32_safe(&p, end, m->num_ops, e_inval);
+ if (m->num_ops > ARRAY_SIZE(m->outdata_len))
+ goto e_inval;
- dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
- req, result);
-
- ceph_decode_need(&p, end, 4, bad_put);
- numops = ceph_decode_32(&p);
- if (numops > CEPH_OSD_MAX_OPS)
- goto bad_put;
- if (numops != req->r_num_ops)
- goto bad_put;
- payload_len = 0;
- ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad_put);
- for (i = 0; i < numops; i++) {
+ ceph_decode_need(&p, end, m->num_ops * sizeof(struct ceph_osd_op),
+ e_inval);
+ for (i = 0; i < m->num_ops; i++) {
struct ceph_osd_op *op = p;
- int len;
- len = le32_to_cpu(op->payload_len);
- req->r_ops[i].outdata_len = len;
- dout(" op %d has %d bytes\n", i, len);
- payload_len += len;
+ m->outdata_len[i] = le32_to_cpu(op->payload_len);
p += sizeof(*op);
}
- bytes = le32_to_cpu(msg->hdr.data_len);
- if (payload_len != bytes) {
- pr_warn("sum of op payload lens %d != data_len %d\n",
- payload_len, bytes);
- goto bad_put;
- }
- ceph_decode_need(&p, end, 4 + numops * 4, bad_put);
- retry_attempt = ceph_decode_32(&p);
- for (i = 0; i < numops; i++)
- req->r_ops[i].rval = ceph_decode_32(&p);
+ ceph_decode_32_safe(&p, end, m->retry_attempt, e_inval);
+ for (i = 0; i < m->num_ops; i++)
+ ceph_decode_32_safe(&p, end, m->rval[i], e_inval);
- if (le16_to_cpu(msg->hdr.version) >= 6) {
- p += 8 + 4; /* skip replay_version */
- p += 8; /* skip user_version */
+ if (version >= 5) {
+ ceph_decode_need(&p, end, sizeof(m->replay_version), e_inval);
+ memcpy(&m->replay_version, p, sizeof(m->replay_version));
+ p += sizeof(m->replay_version);
+ ceph_decode_64_safe(&p, end, m->user_version, e_inval);
+ } else {
+ m->replay_version = bad_replay_version; /* struct */
+ m->user_version = le64_to_cpu(m->replay_version.version);
+ }
- if (le16_to_cpu(msg->hdr.version) >= 7)
- ceph_decode_8_safe(&p, end, decode_redir, bad_put);
+ if (version >= 6) {
+ if (version >= 7)
+ ceph_decode_8_safe(&p, end, decode_redir, e_inval);
else
decode_redir = 1;
} else {
@@ -1983,19 +1960,96 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg)
}
if (decode_redir) {
- err = ceph_redirect_decode(&p, end, &redir);
- if (err)
- goto bad_put;
+ ret = ceph_redirect_decode(&p, end, &m->redirect);
+ if (ret)
+ return ret;
} else {
- redir.oloc.pool = -1;
+ ceph_oloc_init(&m->redirect.oloc);
}
- if (!ceph_oloc_empty(&redir.oloc)) {
- dout("redirect pool %lld\n", redir.oloc.pool);
+ return 0;
+
+e_inval:
+ return -EINVAL;
+}
+
+/*
+ * We are done with @req if
+ * - @m is a safe reply, or
+ * - @m is an unsafe reply and we didn't want a safe one
+ */
+static bool done_request(const struct ceph_osd_request *req,
+ const struct MOSDOpReply *m)
+{
+ return (m->result < 0 ||
+ (m->flags & CEPH_OSD_FLAG_ONDISK) ||
+ !(req->r_flags & CEPH_OSD_FLAG_ONDISK));
+}
+/*
+ * handle osd op reply. either call the callback if it is specified,
+ * or do the completion to wake up the waiting thread.
+ *
+ * ->r_unsafe_callback is set? yes no
+ *
+ * first reply is OK (needed r_cb/r_completion, r_cb/r_completion,
+ * any or needed/got safe) r_safe_completion r_safe_completion
+ *
+ * first reply is unsafe r_unsafe_cb(true) (nothing)
+ *
+ * when we get the safe reply r_unsafe_cb(false), r_cb/r_completion,
+ * r_safe_completion r_safe_completion
+ */
+static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg)
+{
+ struct ceph_osd_request *req;
+ struct MOSDOpReply m;
+ u64 tid = le64_to_cpu(msg->hdr.tid);
+ u32 data_len = 0;
+ bool already_acked;
+ int ret;
+ int i;
+
+ dout("%s msg %p tid %llu\n", __func__, msg, tid);
+
+ down_read(&osdc->map_sem);
+ mutex_lock(&osdc->request_mutex);
+ req = lookup_request(&osdc->requests, tid);
+ if (!req) {
+ dout("%s no tid %llu\n", __func__, tid);
+ goto out_unlock;
+ }
+ ceph_osdc_get_request(req);
+
+ ret = decode_MOSDOpReply(msg, &m);
+ if (ret) {
+ pr_err("failed to decode MOSDOpReply for tid %llu: %d\n",
+ req->r_tid, ret);
+ ceph_msg_dump(msg);
+ goto fail_request;
+ }
+ dout("%s req %p tid %llu flags 0x%llx pgid %llu.%x epoch %u attempt %d v %u'%llu uv %llu\n",
+ __func__, req, req->r_tid, m.flags, m.pgid.pool, m.pgid.seed,
+ m.epoch, m.retry_attempt, le32_to_cpu(m.replay_version.epoch),
+ le64_to_cpu(m.replay_version.version), m.user_version);
+
+ if (m.retry_attempt >= 0) {
+ if (m.retry_attempt != req->r_attempts - 1) {
+ dout("req %p tid %llu retry_attempt %d != %d, ignoring\n",
+ req, req->r_tid, m.retry_attempt,
+ req->r_attempts - 1);
+ goto out_put;
+ }
+ } else {
+ WARN_ON(1); /* MOSDOpReply v4 is assumed */
+ }
+
+ if (!ceph_oloc_empty(&m.redirect.oloc)) {
+ dout("req %p tid %llu redirect pool %lld\n", req, req->r_tid,
+ m.redirect.oloc.pool);
__unregister_request(osdc, req);
- ceph_oloc_copy(&req->r_t.target_oloc, &redir.oloc);
+ ceph_oloc_copy(&req->r_t.target_oloc, &m.redirect.oloc);
/*
* Start redirect requests with nofail=true. If
@@ -2005,85 +2059,85 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg)
* successfully. In the future we might want to follow
* original request's nofail setting here.
*/
- err = __ceph_osdc_start_request(osdc, req, true);
- BUG_ON(err);
+ ret = __ceph_osdc_start_request(osdc, req, true);
+ BUG_ON(ret);
- goto out_unlock;
+ goto out_put;
}
- already_completed = req->r_got_reply;
- if (!req->r_got_reply) {
- req->r_result = result;
- dout("handle_reply result %d bytes %d\n", req->r_result,
- bytes);
- if (req->r_result == 0)
- req->r_result = bytes;
-
- /* in case this is a write and we need to replay, */
- req->r_replay_version.epoch = cpu_to_le32(reassert_epoch);
- req->r_replay_version.version = cpu_to_le64(reassert_version);
-
- req->r_got_reply = 1;
- } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
- dout("handle_reply tid %llu dup ack\n", tid);
- goto out_unlock;
+ if (m.num_ops != req->r_num_ops) {
+ pr_err("num_ops %d != %d for tid %llu\n", m.num_ops,
+ req->r_num_ops, req->r_tid);
+ goto fail_request;
}
-
- dout("handle_reply tid %llu flags %d\n", tid, flags);
-
- if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
- __register_linger_request(osdc, req);
-
- /* either this is a read, or we got the safe response */
- if (result < 0 ||
- (flags & CEPH_OSD_FLAG_ONDISK) ||
- ((flags & CEPH_OSD_FLAG_WRITE) == 0))
+ for (i = 0; i < req->r_num_ops; i++) {
+ dout(" req %p tid %llu op %d rval %d len %u\n", req,
+ req->r_tid, i, m.rval[i], m.outdata_len[i]);
+ req->r_ops[i].rval = m.rval[i];
+ req->r_ops[i].outdata_len = m.outdata_len[i];
+ data_len += m.outdata_len[i];
+ }
+ if (data_len != le32_to_cpu(msg->hdr.data_len)) {
+ pr_err("sum of lens %u != %u for tid %llu\n", data_len,
+ le32_to_cpu(msg->hdr.data_len), req->r_tid);
+ goto fail_request;
+ }
+ dout("%s req %p tid %llu acked %d result %d data_len %u\n", __func__,
+ req, req->r_tid, req->r_got_reply, m.result, data_len);
+
+ already_acked = req->r_got_reply;
+ if (!already_acked) {
+ req->r_result = m.result ?: data_len;
+ req->r_replay_version = m.replay_version; /* struct */
+ req->r_got_reply = true;
+ } else if (!(m.flags & CEPH_OSD_FLAG_ONDISK)) {
+ dout("req %p tid %llu dup ack\n", req, req->r_tid);
+ goto out_put;
+ }
+
+ if (done_request(req, &m)) {
__unregister_request(osdc, req);
+ if (req->r_linger) {
+ WARN_ON(req->r_unsafe_callback);
+ __register_linger_request(osdc, req);
+ }
+ }
mutex_unlock(&osdc->request_mutex);
up_read(&osdc->map_sem);
- if (!already_completed) {
- if (req->r_unsafe_callback &&
- result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK))
- req->r_unsafe_callback(req, true);
- if (req->r_callback)
- req->r_callback(req);
- else
- complete_all(&req->r_completion);
- }
-
- if (flags & CEPH_OSD_FLAG_ONDISK) {
- if (req->r_unsafe_callback && already_completed)
+ if (done_request(req, &m)) {
+ if (already_acked && req->r_unsafe_callback) {
+ dout("req %p tid %llu safe-cb\n", req, req->r_tid);
req->r_unsafe_callback(req, false);
- complete_request(req);
+ } else {
+ dout("req %p tid %llu cb\n", req, req->r_tid);
+ __complete_request(req);
+ }
+ } else {
+ if (req->r_unsafe_callback) {
+ dout("req %p tid %llu unsafe-cb\n", req, req->r_tid);
+ req->r_unsafe_callback(req, true);
+ } else {
+ WARN_ON(1);
+ }
}
+ if (m.flags & CEPH_OSD_FLAG_ONDISK)
+ complete_all(&req->r_safe_completion);
-out:
- dout("req=%p req->r_linger=%d\n", req, req->r_linger);
ceph_osdc_put_request(req);
return;
-out_unlock:
- mutex_unlock(&osdc->request_mutex);
- up_read(&osdc->map_sem);
- goto out;
-bad_put:
+fail_request:
req->r_result = -EIO;
__unregister_request(osdc, req);
- if (req->r_callback)
- req->r_callback(req);
- else
- complete_all(&req->r_completion);
- complete_request(req);
+ __complete_request(req);
+ complete_all(&req->r_safe_completion);
+out_put:
ceph_osdc_put_request(req);
-bad_mutex:
+out_unlock:
mutex_unlock(&osdc->request_mutex);
up_read(&osdc->map_sem);
-bad:
- pr_err("corrupt osd_op_reply got %d %d\n",
- (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
- ceph_msg_dump(msg);
}
static void reset_changed_osds(struct ceph_osd_client *osdc)
@@ -2591,7 +2645,9 @@ int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
if (rc < 0) {
dout("%s %p tid %llu interrupted\n", __func__, req, req->r_tid);
ceph_osdc_cancel_request(req);
- complete_request(req);
+
+ /* kludge - need to to wake ceph_osdc_sync() */
+ complete_all(&req->r_safe_completion);
return rc;
}