NFS: Fix show_nfs_errors macros again

I noticed that NFS status values stopped working again.

trace_print_symbols_seq() takes an unsigned long. Passing a negative
errno or negative NFSERR value just confuses it, and since we're
using C macros here and not static inline functions, all bets are
off due to implicit type conversion.

Straight-line the calling conventions so that error codes are stored
in the trace record as positive values in an unsigned long field,
mapped to symbolic as an unsigned long, and displayed as a negative
value, to continue to enable grepping on "error=-".

It's often the case that an error value that is positive is a byte
count but when it's negative, it's an error (e.g. nfs4_write). Fix
those cases so that the value that is eventually stored in the
error field is a positive NFS status or errno, or zero.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

fs/nfs/nfs4trace.h

@@ -156,7 +156,7 @@ TRACE_DEFINE_ENUM(NFS4ERR_WRONG_TYPE);
 TRACE_DEFINE_ENUM(NFS4ERR_XDEV);
 
 #define show_nfsv4_errors(error) \
-	__print_symbolic(-(error), \
+	__print_symbolic(error, \
 		{ NFS4_OK, "OK" }, \
 		/* Mapped by nfs4_stat_to_errno() */ \
 		{ EPERM, "EPERM" }, \
@@ -348,7 +348,7 @@ DECLARE_EVENT_CLASS(nfs4_clientid_event,
 
 		TP_STRUCT__entry(
 			__string(dstaddr, clp->cl_hostname)
-			__field(int, error)
+			__field(unsigned long, error)
 		),
 
 		TP_fast_assign(
@@ -357,8 +357,8 @@ DECLARE_EVENT_CLASS(nfs4_clientid_event,
 		),
 
 		TP_printk(
-			"error=%d (%s) dstaddr=%s",
-			__entry->error,
+			"error=%ld (%s) dstaddr=%s",
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			__get_str(dstaddr)
 		)
@@ -420,7 +420,7 @@ TRACE_EVENT(nfs4_sequence_done,
 			__field(unsigned int, highest_slotid)
 			__field(unsigned int, target_highest_slotid)
 			__field(unsigned int, status_flags)
-			__field(int, error)
+			__field(unsigned long, error)
 		),
 
 		TP_fast_assign(
@@ -435,10 +435,10 @@ TRACE_EVENT(nfs4_sequence_done,
 			__entry->error = res->sr_status;
 		),
 		TP_printk(
-			"error=%d (%s) session=0x%08x slot_nr=%u seq_nr=%u "
+			"error=%ld (%s) session=0x%08x slot_nr=%u seq_nr=%u "
 			"highest_slotid=%u target_highest_slotid=%u "
 			"status_flags=%u (%s)",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			__entry->session,
 			__entry->slot_nr,
@@ -467,7 +467,7 @@ TRACE_EVENT(nfs4_cb_sequence,
 			__field(unsigned int, seq_nr)
 			__field(unsigned int, highest_slotid)
 			__field(unsigned int, cachethis)
-			__field(int, error)
+			__field(unsigned long, error)
 		),
 
 		TP_fast_assign(
@@ -476,13 +476,13 @@ TRACE_EVENT(nfs4_cb_sequence,
 			__entry->seq_nr = args->csa_sequenceid;
 			__entry->highest_slotid = args->csa_highestslotid;
 			__entry->cachethis = args->csa_cachethis;
-			__entry->error = -be32_to_cpu(status);
+			__entry->error = be32_to_cpu(status);
 		),
 
 		TP_printk(
-			"error=%d (%s) session=0x%08x slot_nr=%u seq_nr=%u "
+			"error=%ld (%s) session=0x%08x slot_nr=%u seq_nr=%u "
 			"highest_slotid=%u",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			__entry->session,
 			__entry->slot_nr,
@@ -504,7 +504,7 @@ TRACE_EVENT(nfs4_cb_seqid_err,
 			__field(unsigned int, seq_nr)
 			__field(unsigned int, highest_slotid)
 			__field(unsigned int, cachethis)
-			__field(int, error)
+			__field(unsigned long, error)
 		),
 
 		TP_fast_assign(
@@ -513,13 +513,13 @@ TRACE_EVENT(nfs4_cb_seqid_err,
 			__entry->seq_nr = args->csa_sequenceid;
 			__entry->highest_slotid = args->csa_highestslotid;
 			__entry->cachethis = args->csa_cachethis;
-			__entry->error = -be32_to_cpu(status);
+			__entry->error = be32_to_cpu(status);
 		),
 
 		TP_printk(
-			"error=%d (%s) session=0x%08x slot_nr=%u seq_nr=%u "
+			"error=%ld (%s) session=0x%08x slot_nr=%u seq_nr=%u "
 			"highest_slotid=%u",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			__entry->session,
 			__entry->slot_nr,
@@ -572,18 +572,18 @@ TRACE_EVENT(nfs4_xdr_status,
 
 		TP_STRUCT__entry(
 			__field(u32, op)
-			__field(int, error)
+			__field(unsigned long, error)
 		),
 
 		TP_fast_assign(
 			__entry->op = op;
-			__entry->error = -error;
+			__entry->error = error;
 		),
 
 		TP_printk(
-			"operation %d: nfs status %d (%s)",
-			__entry->op,
-			__entry->error, show_nfsv4_errors(__entry->error)
+			"error=%ld (%s) operation %d:",
+			-__entry->error, show_nfsv4_errors(__entry->error),
+			__entry->op
 		)
 );
 
@@ -597,7 +597,7 @@ DECLARE_EVENT_CLASS(nfs4_open_event,
 		TP_ARGS(ctx, flags, error),
 
 		TP_STRUCT__entry(
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(unsigned int, flags)
 			__field(unsigned int, fmode)
 			__field(dev_t, dev)
@@ -615,7 +615,7 @@ DECLARE_EVENT_CLASS(nfs4_open_event,
 			const struct nfs4_state *state = ctx->state;
 			const struct inode *inode = NULL;
 
-			__entry->error = error;
+			__entry->error = -error;
 			__entry->flags = flags;
 			__entry->fmode = (__force unsigned int)ctx->mode;
 			__entry->dev = ctx->dentry->d_sb->s_dev;
@@ -647,11 +647,11 @@ DECLARE_EVENT_CLASS(nfs4_open_event,
 		),
 
 		TP_printk(
-			"error=%d (%s) flags=%d (%s) fmode=%s "
+			"error=%ld (%s) flags=%d (%s) fmode=%s "
 			"fileid=%02x:%02x:%llu fhandle=0x%08x "
 			"name=%02x:%02x:%llu/%s stateid=%d:0x%08x "
 			"openstateid=%d:0x%08x",
-			 __entry->error,
+			 -__entry->error,
 			 show_nfsv4_errors(__entry->error),
 			 __entry->flags,
 			 show_open_flags(__entry->flags),
@@ -733,7 +733,7 @@ TRACE_EVENT(nfs4_close,
 			__field(u32, fhandle)
 			__field(u64, fileid)
 			__field(unsigned int, fmode)
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(int, stateid_seq)
 			__field(u32, stateid_hash)
 		),
@@ -753,9 +753,9 @@ TRACE_EVENT(nfs4_close,
 		),
 
 		TP_printk(
-			"error=%d (%s) fmode=%s fileid=%02x:%02x:%llu "
+			"error=%ld (%s) fmode=%s fileid=%02x:%02x:%llu "
 			"fhandle=0x%08x openstateid=%d:0x%08x",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			__entry->fmode ?  show_fmode_flags(__entry->fmode) :
 					  "closed",
@@ -795,7 +795,7 @@ DECLARE_EVENT_CLASS(nfs4_lock_event,
 		TP_ARGS(request, state, cmd, error),
 
 		TP_STRUCT__entry(
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(int, cmd)
 			__field(char, type)
 			__field(loff_t, start)
@@ -825,10 +825,10 @@ DECLARE_EVENT_CLASS(nfs4_lock_event,
 		),
 
 		TP_printk(
-			"error=%d (%s) cmd=%s:%s range=%lld:%lld "
+			"error=%ld (%s) cmd=%s:%s range=%lld:%lld "
 			"fileid=%02x:%02x:%llu fhandle=0x%08x "
 			"stateid=%d:0x%08x",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			show_lock_cmd(__entry->cmd),
 			show_lock_type(__entry->type),
@@ -865,7 +865,7 @@ TRACE_EVENT(nfs4_set_lock,
 		TP_ARGS(request, state, lockstateid, cmd, error),
 
 		TP_STRUCT__entry(
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(int, cmd)
 			__field(char, type)
 			__field(loff_t, start)
@@ -901,10 +901,10 @@ TRACE_EVENT(nfs4_set_lock,
 		),
 
 		TP_printk(
-			"error=%d (%s) cmd=%s:%s range=%lld:%lld "
+			"error=%ld (%s) cmd=%s:%s range=%lld:%lld "
 			"fileid=%02x:%02x:%llu fhandle=0x%08x "
 			"stateid=%d:0x%08x lockstateid=%d:0x%08x",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			show_lock_cmd(__entry->cmd),
 			show_lock_type(__entry->type),
@@ -970,7 +970,7 @@ TRACE_EVENT(nfs4_delegreturn_exit,
 		TP_STRUCT__entry(
 			__field(dev_t, dev)
 			__field(u32, fhandle)
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(int, stateid_seq)
 			__field(u32, stateid_hash)
 		),
@@ -986,9 +986,9 @@ TRACE_EVENT(nfs4_delegreturn_exit,
 		),
 
 		TP_printk(
-			"error=%d (%s) dev=%02x:%02x fhandle=0x%08x "
+			"error=%ld (%s) dev=%02x:%02x fhandle=0x%08x "
 			"stateid=%d:0x%08x",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			__entry->fhandle,
@@ -1007,7 +1007,7 @@ DECLARE_EVENT_CLASS(nfs4_test_stateid_event,
 		TP_ARGS(state, lsp, error),
 
 		TP_STRUCT__entry(
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(dev_t, dev)
 			__field(u32, fhandle)
 			__field(u64, fileid)
@@ -1029,9 +1029,9 @@ DECLARE_EVENT_CLASS(nfs4_test_stateid_event,
 		),
 
 		TP_printk(
-			"error=%d (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
+			"error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
 			"stateid=%d:0x%08x",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid,
@@ -1064,7 +1064,7 @@ DECLARE_EVENT_CLASS(nfs4_lookup_event,
 
 		TP_STRUCT__entry(
 			__field(dev_t, dev)
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(u64, dir)
 			__string(name, name->name)
 		),
@@ -1072,13 +1072,13 @@ DECLARE_EVENT_CLASS(nfs4_lookup_event,
 		TP_fast_assign(
 			__entry->dev = dir->i_sb->s_dev;
 			__entry->dir = NFS_FILEID(dir);
-			__entry->error = error;
+			__entry->error = -error;
 			__assign_str(name, name->name);
 		),
 
 		TP_printk(
-			"error=%d (%s) name=%02x:%02x:%llu/%s",
-			__entry->error,
+			"error=%ld (%s) name=%02x:%02x:%llu/%s",
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->dir,
@@ -1114,7 +1114,7 @@ TRACE_EVENT(nfs4_lookupp,
 		TP_STRUCT__entry(
 			__field(dev_t, dev)
 			__field(u64, ino)
-			__field(int, error)
+			__field(unsigned long, error)
 		),
 
 		TP_fast_assign(
@@ -1124,8 +1124,8 @@ TRACE_EVENT(nfs4_lookupp,
 		),
 
 		TP_printk(
-			"error=%d (%s) inode=%02x:%02x:%llu",
-			__entry->error,
+			"error=%ld (%s) inode=%02x:%02x:%llu",
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->ino
@@ -1145,7 +1145,7 @@ TRACE_EVENT(nfs4_rename,
 
 		TP_STRUCT__entry(
 			__field(dev_t, dev)
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(u64, olddir)
 			__string(oldname, oldname->name)
 			__field(u64, newdir)
@@ -1162,9 +1162,9 @@ TRACE_EVENT(nfs4_rename,
 		),
 
 		TP_printk(
-			"error=%d (%s) oldname=%02x:%02x:%llu/%s "
+			"error=%ld (%s) oldname=%02x:%02x:%llu/%s "
 			"newname=%02x:%02x:%llu/%s",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->olddir,
@@ -1187,19 +1187,19 @@ DECLARE_EVENT_CLASS(nfs4_inode_event,
 			__field(dev_t, dev)
 			__field(u32, fhandle)
 			__field(u64, fileid)
-			__field(int, error)
+			__field(unsigned long, error)
 		),
 
 		TP_fast_assign(
 			__entry->dev = inode->i_sb->s_dev;
 			__entry->fileid = NFS_FILEID(inode);
 			__entry->fhandle = nfs_fhandle_hash(NFS_FH(inode));
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 		),
 
 		TP_printk(
-			"error=%d (%s) fileid=%02x:%02x:%llu fhandle=0x%08x",
-			__entry->error,
+			"error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x",
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid,
@@ -1238,7 +1238,7 @@ DECLARE_EVENT_CLASS(nfs4_inode_stateid_event,
 			__field(dev_t, dev)
 			__field(u32, fhandle)
 			__field(u64, fileid)
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(int, stateid_seq)
 			__field(u32, stateid_hash)
 		),
@@ -1255,9 +1255,9 @@ DECLARE_EVENT_CLASS(nfs4_inode_stateid_event,
 		),
 
 		TP_printk(
-			"error=%d (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
+			"error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
 			"stateid=%d:0x%08x",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid,
@@ -1295,7 +1295,7 @@ DECLARE_EVENT_CLASS(nfs4_getattr_event,
 			__field(u32, fhandle)
 			__field(u64, fileid)
 			__field(unsigned int, valid)
-			__field(int, error)
+			__field(unsigned long, error)
 		),
 
 		TP_fast_assign(
@@ -1307,9 +1307,9 @@ DECLARE_EVENT_CLASS(nfs4_getattr_event,
 		),
 
 		TP_printk(
-			"error=%d (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
+			"error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
 			"valid=%s",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid,
@@ -1342,7 +1342,7 @@ DECLARE_EVENT_CLASS(nfs4_inode_callback_event,
 		TP_ARGS(clp, fhandle, inode, error),
 
 		TP_STRUCT__entry(
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(dev_t, dev)
 			__field(u32, fhandle)
 			__field(u64, fileid)
@@ -1363,9 +1363,9 @@ DECLARE_EVENT_CLASS(nfs4_inode_callback_event,
 		),
 
 		TP_printk(
-			"error=%d (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
+			"error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
 			"dstaddr=%s",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid,
@@ -1397,7 +1397,7 @@ DECLARE_EVENT_CLASS(nfs4_inode_stateid_callback_event,
 		TP_ARGS(clp, fhandle, inode, stateid, error),
 
 		TP_STRUCT__entry(
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(dev_t, dev)
 			__field(u32, fhandle)
 			__field(u64, fileid)
@@ -1424,9 +1424,9 @@ DECLARE_EVENT_CLASS(nfs4_inode_stateid_callback_event,
 		),
 
 		TP_printk(
-			"error=%d (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
+			"error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
 			"stateid=%d:0x%08x dstaddr=%s",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid,
@@ -1460,7 +1460,7 @@ DECLARE_EVENT_CLASS(nfs4_idmap_event,
 		TP_ARGS(name, len, id, error),
 
 		TP_STRUCT__entry(
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(u32, id)
 			__dynamic_array(char, name, len > 0 ? len + 1 : 1)
 		),
@@ -1475,8 +1475,8 @@ DECLARE_EVENT_CLASS(nfs4_idmap_event,
 		),
 
 		TP_printk(
-			"error=%d id=%u name=%s",
-			__entry->error,
+			"error=%ld (%s) id=%u name=%s",
+			-__entry->error, show_nfsv4_errors(__entry->error),
 			__entry->id,
 			__get_str(name)
 		)
@@ -1509,7 +1509,7 @@ DECLARE_EVENT_CLASS(nfs4_read_event,
 			__field(u64, fileid)
 			__field(loff_t, offset)
 			__field(size_t, count)
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(int, stateid_seq)
 			__field(u32, stateid_hash)
 		),
@@ -1523,7 +1523,7 @@ DECLARE_EVENT_CLASS(nfs4_read_event,
 			__entry->fhandle = nfs_fhandle_hash(NFS_FH(inode));
 			__entry->offset = hdr->args.offset;
 			__entry->count = hdr->args.count;
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 			__entry->stateid_seq =
 				be32_to_cpu(state->stateid.seqid);
 			__entry->stateid_hash =
@@ -1531,9 +1531,9 @@ DECLARE_EVENT_CLASS(nfs4_read_event,
 		),
 
 		TP_printk(
-			"error=%d (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
+			"error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
 			"offset=%lld count=%zu stateid=%d:0x%08x",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid,
@@ -1569,7 +1569,7 @@ DECLARE_EVENT_CLASS(nfs4_write_event,
 			__field(u64, fileid)
 			__field(loff_t, offset)
 			__field(size_t, count)
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(int, stateid_seq)
 			__field(u32, stateid_hash)
 		),
@@ -1583,7 +1583,7 @@ DECLARE_EVENT_CLASS(nfs4_write_event,
 			__entry->fhandle = nfs_fhandle_hash(NFS_FH(inode));
 			__entry->offset = hdr->args.offset;
 			__entry->count = hdr->args.count;
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 			__entry->stateid_seq =
 				be32_to_cpu(state->stateid.seqid);
 			__entry->stateid_hash =
@@ -1591,9 +1591,9 @@ DECLARE_EVENT_CLASS(nfs4_write_event,
 		),
 
 		TP_printk(
-			"error=%d (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
+			"error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
 			"offset=%lld count=%zu stateid=%d:0x%08x",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid,
@@ -1630,7 +1630,7 @@ DECLARE_EVENT_CLASS(nfs4_commit_event,
 			__field(u64, fileid)
 			__field(loff_t, offset)
 			__field(size_t, count)
-			__field(int, error)
+			__field(unsigned long, error)
 		),
 
 		TP_fast_assign(
@@ -1644,9 +1644,9 @@ DECLARE_EVENT_CLASS(nfs4_commit_event,
 		),
 
 		TP_printk(
-			"error=%d (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
+			"error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
 			"offset=%lld count=%zu",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid,
@@ -1694,7 +1694,7 @@ TRACE_EVENT(nfs4_layoutget,
 			__field(u32, iomode)
 			__field(u64, offset)
 			__field(u64, count)
-			__field(int, error)
+			__field(unsigned long, error)
 			__field(int, stateid_seq)
 			__field(u32, stateid_hash)
 			__field(int, layoutstateid_seq)
@@ -1727,10 +1727,10 @@ TRACE_EVENT(nfs4_layoutget,
 		),
 
 		TP_printk(
-			"error=%d (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
+			"error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
 			"iomode=%s offset=%llu count=%llu stateid=%d:0x%08x "
 			"layoutstateid=%d:0x%08x",
-			__entry->error,
+			-__entry->error,
 			show_nfsv4_errors(__entry->error),
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid,