NFS: Clean up generic writeback tracepoints

Clean up the generic writeback tracepoints so they do pass the
full structures as arguments. Also ensure we report the number
of bytes actually written.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

fs/nfs/nfstrace.h

@@ -915,87 +915,96 @@ TRACE_DEFINE_ENUM(NFS_FILE_SYNC);
 
 TRACE_EVENT(nfs_initiate_write,
 		TP_PROTO(
-			const struct inode *inode,
-			loff_t offset, unsigned long count,
-			enum nfs3_stable_how stable
+			const struct nfs_pgio_header *hdr
 		),
 
-		TP_ARGS(inode, offset, count, stable),
+		TP_ARGS(hdr),
 
 		TP_STRUCT__entry(
-			__field(loff_t, offset)
-			__field(unsigned long, count)
-			__field(enum nfs3_stable_how, stable)
 			__field(dev_t, dev)
 			__field(u32, fhandle)
 			__field(u64, fileid)
+			__field(loff_t, offset)
+			__field(u32, count)
+			__field(enum nfs3_stable_how, stable)
 		),
 
 		TP_fast_assign(
+			const struct inode *inode = hdr->inode;
 			const struct nfs_inode *nfsi = NFS_I(inode);
+			const struct nfs_fh *fh = hdr->args.fh ?
+						  hdr->args.fh : &nfsi->fh;
 
-			__entry->offset = offset;
-			__entry->count = count;
-			__entry->stable = stable;
+			__entry->offset = hdr->args.offset;
+			__entry->count = hdr->args.count;
+			__entry->stable = hdr->args.stable;
 			__entry->dev = inode->i_sb->s_dev;
 			__entry->fileid = nfsi->fileid;
-			__entry->fhandle = nfs_fhandle_hash(&nfsi->fh);
+			__entry->fhandle = nfs_fhandle_hash(fh);
 		),
 
 		TP_printk(
 			"fileid=%02x:%02x:%llu fhandle=0x%08x "
-			"offset=%lld count=%lu stable=%s",
+			"offset=%lld count=%u stable=%s",
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid,
 			__entry->fhandle,
-			__entry->offset, __entry->count,
+			(long long)__entry->offset, __entry->count,
 			nfs_show_stable(__entry->stable)
 		)
 );
 
 TRACE_EVENT(nfs_writeback_done,
 		TP_PROTO(
-			const struct inode *inode,
-			int status,
-			loff_t offset,
-			struct nfs_writeverf *writeverf
+			const struct rpc_task *task,
+			const struct nfs_pgio_header *hdr
 		),
 
-		TP_ARGS(inode, status, offset, writeverf),
+		TP_ARGS(task, hdr),
 
 		TP_STRUCT__entry(
-			__field(int, status)
-			__field(loff_t, offset)
-			__field(enum nfs3_stable_how, stable)
-			__field(unsigned long long, verifier)
 			__field(dev_t, dev)
 			__field(u32, fhandle)
 			__field(u64, fileid)
+			__field(loff_t, offset)
+			__field(u32, arg_count)
+			__field(u32, res_count)
+			__field(int, status)
+			__field(enum nfs3_stable_how, stable)
+			__array(char, verifier, NFS4_VERIFIER_SIZE)
 		),
 
 		TP_fast_assign(
+			const struct inode *inode = hdr->inode;
 			const struct nfs_inode *nfsi = NFS_I(inode);
+			const struct nfs_fh *fh = hdr->args.fh ?
+						  hdr->args.fh : &nfsi->fh;
+			const struct nfs_writeverf *verf = hdr->res.verf;
 
-			__entry->status = status;
-			__entry->offset = offset;
-			__entry->stable = writeverf->committed;
-			memcpy(&__entry->verifier, &writeverf->verifier,
-			       sizeof(__entry->verifier));
+			__entry->status = task->tk_status;
+			__entry->offset = hdr->args.offset;
+			__entry->arg_count = hdr->args.count;
+			__entry->res_count = hdr->res.count;
+			__entry->stable = verf->committed;
+			memcpy(__entry->verifier,
+				&verf->verifier,
+				NFS4_VERIFIER_SIZE);
 			__entry->dev = inode->i_sb->s_dev;
 			__entry->fileid = nfsi->fileid;
-			__entry->fhandle = nfs_fhandle_hash(&nfsi->fh);
+			__entry->fhandle = nfs_fhandle_hash(fh);
 		),
 
 		TP_printk(
 			"fileid=%02x:%02x:%llu fhandle=0x%08x "
-			"offset=%lld status=%d stable=%s "
-			"verifier 0x%016llx",
+			"offset=%lld count=%u res=%u status=%d stable=%s "
+			"verifier=%s",
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid,
 			__entry->fhandle,
-			__entry->offset, __entry->status,
+			(long long)__entry->offset, __entry->arg_count,
+			__entry->res_count, __entry->status,
 			nfs_show_stable(__entry->stable),
-			__entry->verifier
+			__print_hex_str(__entry->verifier, NFS4_VERIFIER_SIZE)
 		)
 );
 

fs/nfs/write.c

@@ -1414,8 +1414,7 @@ static void nfs_initiate_write(struct nfs_pgio_header *hdr,
 
 	task_setup_data->priority = priority;
 	rpc_ops->write_setup(hdr, msg, &task_setup_data->rpc_client);
-	trace_nfs_initiate_write(hdr->inode, hdr->io_start, hdr->good_bytes,
-				 hdr->args.stable);
+	trace_nfs_initiate_write(hdr);
 }
 
 /* If a nfs_flush_* function fails, it should remove reqs from @head and
@@ -1579,8 +1578,7 @@ static int nfs_writeback_done(struct rpc_task *task,
 		return status;
 
 	nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, hdr->res.count);
-	trace_nfs_writeback_done(inode, task->tk_status,
-				 hdr->args.offset, hdr->res.verf);
+	trace_nfs_writeback_done(task, hdr);
 
 	if (hdr->res.verf->committed < hdr->args.stable &&
 	    task->tk_status >= 0) {