pNFS/flexfiles: Add tracing for layout errors

Trace layout errors for pNFS/flexfiles on read/write/commit operations.

Signed-off-by: Trond Myklebust <[e-mail]>
Signed-off-by: Anna Schumaker <[e-mail]>

fs/nfs/flexfilelayout/flexfilelayout.c

···
 
 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
 					int idx, u64 offset, u64 length,
-					u32 status, int opnum, int error)
+					u32 *op_status, int opnum, int error)
 {
 	struct nfs4_ff_layout_mirror *mirror;
+	u32 status = *op_status;
 	int err;
 
 	if (status == 0) {
···
 		case -ENOBUFS:
 		case -EPIPE:
 		case -EPERM:
-			status = NFS4ERR_NXIO;
+			*op_status = status = NFS4ERR_NXIO;
 			break;
 		case -EACCES:
-			status = NFS4ERR_ACCESS;
+			*op_status = status = NFS4ERR_ACCESS;
 			break;
 		default:
 			return;
···
 	int new_idx = hdr->pgio_mirror_idx;
 	int err;
 
-	if (task->tk_status < 0)
+	if (task->tk_status < 0) {
 		ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
 					    hdr->args.offset, hdr->args.count,
-					    hdr->res.op_status, OP_READ,
+					    &hdr->res.op_status, OP_READ,
 					    task->tk_status);
+		trace_ff_layout_read_error(hdr);
+	}
+
 	err = ff_layout_async_handle_error(task, hdr->args.context->state,
 					   hdr->ds_clp, hdr->lseg,
 					   hdr->pgio_mirror_idx);
···
 	loff_t end_offs = 0;
 	int err;
 
-	if (task->tk_status < 0)
+	if (task->tk_status < 0) {
 		ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
 					    hdr->args.offset, hdr->args.count,
-					    hdr->res.op_status, OP_WRITE,
+					    &hdr->res.op_status, OP_WRITE,
 					    task->tk_status);
+		trace_ff_layout_write_error(hdr);
+	}
+
 	err = ff_layout_async_handle_error(task, hdr->args.context->state,
 					   hdr->ds_clp, hdr->lseg,
 					   hdr->pgio_mirror_idx);
···
 {
 	int err;
 
-	if (task->tk_status < 0)
+	if (task->tk_status < 0) {
 		ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
 					    data->args.offset, data->args.count,
-					    data->res.op_status, OP_COMMIT,
+					    &data->res.op_status, OP_COMMIT,
 					    task->tk_status);
+		trace_ff_layout_commit_error(data);
+	}
+
 	err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
 					   data->lseg, data->ds_commit_index);
 

fs/nfs/nfs4trace.c

···
 EXPORT_TRACEPOINT_SYMBOL_GPL(pnfs_mds_fallback_write_done);
 EXPORT_TRACEPOINT_SYMBOL_GPL(pnfs_mds_fallback_read_pagelist);
 EXPORT_TRACEPOINT_SYMBOL_GPL(pnfs_mds_fallback_write_pagelist);
+
+EXPORT_TRACEPOINT_SYMBOL_GPL(ff_layout_read_error);
+EXPORT_TRACEPOINT_SYMBOL_GPL(ff_layout_write_error);
+EXPORT_TRACEPOINT_SYMBOL_GPL(ff_layout_commit_error);
 #endif

fs/nfs/nfs4trace.h

···
 DEFINE_PNFS_LAYOUT_EVENT(pnfs_mds_fallback_read_pagelist);
 DEFINE_PNFS_LAYOUT_EVENT(pnfs_mds_fallback_write_pagelist);
 
+DECLARE_EVENT_CLASS(nfs4_flexfiles_io_event,
+		TP_PROTO(
+			const struct nfs_pgio_header *hdr
+		),
+
+		TP_ARGS(hdr),
+
+		TP_STRUCT__entry(
+			__field(unsigned long, error)
+			__field(dev_t, dev)
+			__field(u32, fhandle)
+			__field(u64, fileid)
+			__field(loff_t, offset)
+			__field(u32, count)
+			__field(int, stateid_seq)
+			__field(u32, stateid_hash)
+			__string(dstaddr, hdr->ds_clp ?
+				rpc_peeraddr2str(hdr->ds_clp->cl_rpcclient,
+					RPC_DISPLAY_ADDR) : "unknown")
+		),
+
+		TP_fast_assign(
+			const struct inode *inode = hdr->inode;
+
+			__entry->error = hdr->res.op_status;
+			__entry->fhandle = nfs_fhandle_hash(hdr->args.fh);
+			__entry->fileid = NFS_FILEID(inode);
+			__entry->dev = inode->i_sb->s_dev;
+			__entry->offset = hdr->args.offset;
+			__entry->count = hdr->args.count;
+			__entry->stateid_seq =
+				be32_to_cpu(hdr->args.stateid.seqid);
+			__entry->stateid_hash =
+				nfs_stateid_hash(&hdr->args.stateid);
+			__assign_str(dstaddr, hdr->ds_clp ?
+				rpc_peeraddr2str(hdr->ds_clp->cl_rpcclient,
+					RPC_DISPLAY_ADDR) : "unknown");
+		),
+
+		TP_printk(
+			"error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
+			"offset=%llu count=%u stateid=%d:0x%08x dstaddr=%s",
+			-__entry->error,
+			show_nfsv4_errors(__entry->error),
+			MAJOR(__entry->dev), MINOR(__entry->dev),
+			(unsigned long long)__entry->fileid,
+			__entry->fhandle,
+			__entry->offset, __entry->count,
+			__entry->stateid_seq, __entry->stateid_hash,
+			__get_str(dstaddr)
+		)
+);
+
+#define DEFINE_NFS4_FLEXFILES_IO_EVENT(name) \
+	DEFINE_EVENT(nfs4_flexfiles_io_event, name, \
+			TP_PROTO( \
+				const struct nfs_pgio_header *hdr \
+			), \
+			TP_ARGS(hdr))
+DEFINE_NFS4_FLEXFILES_IO_EVENT(ff_layout_read_error);
+DEFINE_NFS4_FLEXFILES_IO_EVENT(ff_layout_write_error);
+
+TRACE_EVENT(ff_layout_commit_error,
+		TP_PROTO(
+			const struct nfs_commit_data *data
+		),
+
+		TP_ARGS(data),
+
+		TP_STRUCT__entry(
+			__field(unsigned long, error)
+			__field(dev_t, dev)
+			__field(u32, fhandle)
+			__field(u64, fileid)
+			__field(loff_t, offset)
+			__field(u32, count)
+			__string(dstaddr, data->ds_clp ?
+				rpc_peeraddr2str(data->ds_clp->cl_rpcclient,
+					RPC_DISPLAY_ADDR) : "unknown")
+		),
+
+		TP_fast_assign(
+			const struct inode *inode = data->inode;
+
+			__entry->error = data->res.op_status;
+			__entry->fhandle = nfs_fhandle_hash(data->args.fh);
+			__entry->fileid = NFS_FILEID(inode);
+			__entry->dev = inode->i_sb->s_dev;
+			__entry->offset = data->args.offset;
+			__entry->count = data->args.count;
+			__assign_str(dstaddr, data->ds_clp ?
+				rpc_peeraddr2str(data->ds_clp->cl_rpcclient,
+					RPC_DISPLAY_ADDR) : "unknown");
+		),
+
+		TP_printk(
+			"error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
+			"offset=%llu count=%u dstaddr=%s",
+			-__entry->error,
+			show_nfsv4_errors(__entry->error),
+			MAJOR(__entry->dev), MINOR(__entry->dev),
+			(unsigned long long)__entry->fileid,
+			__entry->fhandle,
+			__entry->offset, __entry->count,
+			__get_str(dstaddr)
+		)
+);
+
+
 #endif /* CONFIG_NFS_V4_1 */
 
 #endif /* _TRACE_NFS4_H */