NFS: Add trace events to report non-zero NFS status codes
These can help field troubleshooting without needing the overhead
of a full network capture (ie, tcpdump).
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
diff --git a/fs/nfs/nfs2xdr.c b/fs/nfs/nfs2xdr.c
index 7661431..bac3a4e 100644
--- a/fs/nfs/nfs2xdr.c
+++ b/fs/nfs/nfs2xdr.c
@@ -22,6 +22,7 @@
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs_fs.h>
+#include "nfstrace.h"
#include "internal.h"
#define NFSDBG_FACILITY NFSDBG_XDR
@@ -145,7 +146,13 @@ static int decode_stat(struct xdr_stream *xdr, enum nfs_stat *status)
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -EIO;
+ if (unlikely(*p != cpu_to_be32(NFS_OK)))
+ goto out_status;
+ *status = 0;
+ return 0;
+out_status:
*status = be32_to_cpup(p);
+ trace_nfs_xdr_status((int)*status);
return 0;
}
diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c
index e561980..4aa3ffe 100644
--- a/fs/nfs/nfs3xdr.c
+++ b/fs/nfs/nfs3xdr.c
@@ -21,6 +21,7 @@
#include <linux/nfs3.h>
#include <linux/nfs_fs.h>
#include <linux/nfsacl.h>
+#include "nfstrace.h"
#include "internal.h"
#define NFSDBG_FACILITY NFSDBG_XDR
@@ -337,7 +338,13 @@ static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -EIO;
+ if (unlikely(*p != cpu_to_be32(NFS3_OK)))
+ goto out_status;
+ *status = 0;
+ return 0;
+out_status:
*status = be32_to_cpup(p);
+ trace_nfs_xdr_status((int)*status);
return 0;
}
diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h
index b4557cf..cd1a5c0 100644
--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -524,6 +524,31 @@ TRACE_EVENT(nfs4_setup_sequence,
)
);
+TRACE_EVENT(nfs4_xdr_status,
+ TP_PROTO(
+ u32 op,
+ int error
+ ),
+
+ TP_ARGS(op, error),
+
+ TP_STRUCT__entry(
+ __field(u32, op)
+ __field(int, error)
+ ),
+
+ TP_fast_assign(
+ __entry->op = op;
+ __entry->error = -error;
+ ),
+
+ TP_printk(
+ "operation %d: nfs status %d (%s)",
+ __entry->op,
+ __entry->error, show_nfsv4_errors(__entry->error)
+ )
+);
+
DECLARE_EVENT_CLASS(nfs4_open_event,
TP_PROTO(
const struct nfs_open_context *ctx,
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 24e6a45..38a4cbc 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -54,6 +54,7 @@
#include <linux/nfs_fs.h>
#include "nfs4_fs.h"
+#include "nfs4trace.h"
#include "internal.h"
#include "nfs4idmap.h"
#include "nfs4session.h"
@@ -3188,11 +3189,14 @@ static bool __decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected,
opnum = be32_to_cpup(p++);
if (unlikely(opnum != expected))
goto out_bad_operation;
+ if (unlikely(*p != cpu_to_be32(NFS_OK)))
+ goto out_status;
+ *nfs_retval = 0;
+ return true;
+out_status:
nfserr = be32_to_cpup(p);
- if (nfserr == NFS_OK)
- *nfs_retval = 0;
- else
- *nfs_retval = nfs4_stat_to_errno(nfserr);
+ trace_nfs4_xdr_status(opnum, nfserr);
+ *nfs_retval = nfs4_stat_to_errno(nfserr);
return true;
out_bad_operation:
dprintk("nfs: Server returned operation"
diff --git a/fs/nfs/nfstrace.c b/fs/nfs/nfstrace.c
index b60d5fb..a90b363 100644
--- a/fs/nfs/nfstrace.c
+++ b/fs/nfs/nfstrace.c
@@ -11,3 +11,4 @@
EXPORT_TRACEPOINT_SYMBOL_GPL(nfs_fsync_enter);
EXPORT_TRACEPOINT_SYMBOL_GPL(nfs_fsync_exit);
+EXPORT_TRACEPOINT_SYMBOL_GPL(nfs_xdr_status);
diff --git a/fs/nfs/nfstrace.h b/fs/nfs/nfstrace.h
index bd60f8d..a0d6910 100644
--- a/fs/nfs/nfstrace.h
+++ b/fs/nfs/nfstrace.h
@@ -969,6 +969,91 @@ TRACE_EVENT(nfs_commit_done,
)
);
+TRACE_DEFINE_ENUM(NFS_OK);
+TRACE_DEFINE_ENUM(NFSERR_PERM);
+TRACE_DEFINE_ENUM(NFSERR_NOENT);
+TRACE_DEFINE_ENUM(NFSERR_IO);
+TRACE_DEFINE_ENUM(NFSERR_NXIO);
+TRACE_DEFINE_ENUM(NFSERR_ACCES);
+TRACE_DEFINE_ENUM(NFSERR_EXIST);
+TRACE_DEFINE_ENUM(NFSERR_XDEV);
+TRACE_DEFINE_ENUM(NFSERR_NODEV);
+TRACE_DEFINE_ENUM(NFSERR_NOTDIR);
+TRACE_DEFINE_ENUM(NFSERR_ISDIR);
+TRACE_DEFINE_ENUM(NFSERR_INVAL);
+TRACE_DEFINE_ENUM(NFSERR_FBIG);
+TRACE_DEFINE_ENUM(NFSERR_NOSPC);
+TRACE_DEFINE_ENUM(NFSERR_ROFS);
+TRACE_DEFINE_ENUM(NFSERR_MLINK);
+TRACE_DEFINE_ENUM(NFSERR_NAMETOOLONG);
+TRACE_DEFINE_ENUM(NFSERR_NOTEMPTY);
+TRACE_DEFINE_ENUM(NFSERR_DQUOT);
+TRACE_DEFINE_ENUM(NFSERR_STALE);
+TRACE_DEFINE_ENUM(NFSERR_REMOTE);
+TRACE_DEFINE_ENUM(NFSERR_WFLUSH);
+TRACE_DEFINE_ENUM(NFSERR_BADHANDLE);
+TRACE_DEFINE_ENUM(NFSERR_NOT_SYNC);
+TRACE_DEFINE_ENUM(NFSERR_BAD_COOKIE);
+TRACE_DEFINE_ENUM(NFSERR_NOTSUPP);
+TRACE_DEFINE_ENUM(NFSERR_TOOSMALL);
+TRACE_DEFINE_ENUM(NFSERR_SERVERFAULT);
+TRACE_DEFINE_ENUM(NFSERR_BADTYPE);
+TRACE_DEFINE_ENUM(NFSERR_JUKEBOX);
+
+#define nfs_show_status(x) \
+ __print_symbolic(x, \
+ { NFS_OK, "OK" }, \
+ { NFSERR_PERM, "PERM" }, \
+ { NFSERR_NOENT, "NOENT" }, \
+ { NFSERR_IO, "IO" }, \
+ { NFSERR_NXIO, "NXIO" }, \
+ { NFSERR_ACCES, "ACCES" }, \
+ { NFSERR_EXIST, "EXIST" }, \
+ { NFSERR_XDEV, "XDEV" }, \
+ { NFSERR_NODEV, "NODEV" }, \
+ { NFSERR_NOTDIR, "NOTDIR" }, \
+ { NFSERR_ISDIR, "ISDIR" }, \
+ { NFSERR_INVAL, "INVAL" }, \
+ { NFSERR_FBIG, "FBIG" }, \
+ { NFSERR_NOSPC, "NOSPC" }, \
+ { NFSERR_ROFS, "ROFS" }, \
+ { NFSERR_MLINK, "MLINK" }, \
+ { NFSERR_NAMETOOLONG, "NAMETOOLONG" }, \
+ { NFSERR_NOTEMPTY, "NOTEMPTY" }, \
+ { NFSERR_DQUOT, "DQUOT" }, \
+ { NFSERR_STALE, "STALE" }, \
+ { NFSERR_REMOTE, "REMOTE" }, \
+ { NFSERR_WFLUSH, "WFLUSH" }, \
+ { NFSERR_BADHANDLE, "BADHANDLE" }, \
+ { NFSERR_NOT_SYNC, "NOTSYNC" }, \
+ { NFSERR_BAD_COOKIE, "BADCOOKIE" }, \
+ { NFSERR_NOTSUPP, "NOTSUPP" }, \
+ { NFSERR_TOOSMALL, "TOOSMALL" }, \
+ { NFSERR_SERVERFAULT, "REMOTEIO" }, \
+ { NFSERR_BADTYPE, "BADTYPE" }, \
+ { NFSERR_JUKEBOX, "JUKEBOX" })
+
+TRACE_EVENT(nfs_xdr_status,
+ TP_PROTO(
+ int error
+ ),
+
+ TP_ARGS(error),
+
+ TP_STRUCT__entry(
+ __field(int, error)
+ ),
+
+ TP_fast_assign(
+ __entry->error = error;
+ ),
+
+ TP_printk(
+ "error=%d (%s)",
+ __entry->error, nfs_show_status(__entry->error)
+ )
+);
+
#endif /* _TRACE_NFS_H */
#undef TRACE_INCLUDE_PATH