[PATCH 5.15.y 2/3] nfs_common: factor out nfs_errtbl and nfs_stat_to_errno

12 Jan 2026

From: Mike Snitzer snitzer@kernel.org
[ Upstream commit 4806ded4c14c5e8fdc6ce885d83221a78c06a428 ]
Common nfs_stat_to_errno() is used by both fs/nfs/nfs2xdr.c and
fs/nfs/nfs3xdr.c
Will also be used by fs/nfsd/localio.c
Signed-off-by: Mike Snitzer snitzer@kernel.org
Reviewed-by: Jeff Layton jlayton@kernel.org
Reviewed-by: NeilBrown neilb@suse.de
Signed-off-by: Anna Schumaker anna.schumaker@oracle.com
Stable-dep-of: c6c209ceb87f ("NFSD: Remove NFSERR_EAGAIN")
Signed-off-by: Sasha Levin sashal@kernel.org
---
 fs/nfs/Kconfig             |   1 +
 fs/nfs/nfs2xdr.c           |  70 +-----------------------
 fs/nfs/nfs3xdr.c           | 108 +++++++------------------------------
 fs/nfs/nfs4xdr.c           |   4 +-
 fs/nfs_common/Makefile     |   2 +
 fs/nfs_common/common.c     |  67 +++++++++++++++++++++++
 fs/nfsd/Kconfig            |   1 +
 include/linux/nfs_common.h |  16 ++++++
 8 files changed, 109 insertions(+), 160 deletions(-)
 create mode 100644 fs/nfs_common/common.c
 create mode 100644 include/linux/nfs_common.h

diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index 899e25e9b4eb5..9c1d1aff61ee8 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -5,6 +5,7 @@ config NFS_FS
    select CRC32
    select LOCKD
    select SUNRPC
+	select NFS_COMMON
    select NFS_ACL_SUPPORT if NFS_V3_ACL
    help
      Choose Y here if you want to access files residing on other
diff --git a/fs/nfs/nfs2xdr.c b/fs/nfs/nfs2xdr.c
index 266a4badf1dfc..63fe502dd15da 100644
--- a/fs/nfs/nfs2xdr.c
+++ b/fs/nfs/nfs2xdr.c
@@ -22,14 +22,12 @@
 #include <linux/nfs.h>
 #include <linux/nfs2.h>
 #include <linux/nfs_fs.h>
+#include <linux/nfs_common.h>
 #include "nfstrace.h"
 #include "internal.h"
#define NFSDBG_FACILITY		NFSDBG_XDR
-/* Mapping from NFS error code to "errno" error code. */
-#define errno_NFSERR_IO		EIO
-
 /*
  * Declare the space requirements for NFS arguments and replies as
  * number of 32bit-words
@@ -64,8 +62,6 @@
 #define NFS_readdirres_sz	(1+NFS_pagepad_sz)
 #define NFS_statfsres_sz	(1+NFS_info_sz)
-static int nfs_stat_to_errno(enum nfs_stat);
-
 /*
  * Encode/decode NFSv2 basic data types
  *
@@ -1055,70 +1051,6 @@ static int nfs2_xdr_dec_statfsres(struct rpc_rqst *req, struct xdr_stream *xdr,
    return nfs_stat_to_errno(status);
 }
-
-/*
- * We need to translate between nfs status return values and
- * the local errno values which may not be the same.
- */
-static const struct {
-	int stat;
-	int errno;
-} nfs_errtbl[] = {
-	{ NFS_OK,		0		},
-	{ NFSERR_PERM,		-EPERM		},
-	{ NFSERR_NOENT,		-ENOENT		},
-	{ NFSERR_IO,		-errno_NFSERR_IO},
-	{ NFSERR_NXIO,		-ENXIO		},
-/*	{ NFSERR_EAGAIN,	-EAGAIN		}, */
-	{ NFSERR_ACCES,		-EACCES		},
-	{ NFSERR_EXIST,		-EEXIST		},
-	{ NFSERR_XDEV,		-EXDEV		},
-	{ NFSERR_NODEV,		-ENODEV		},
-	{ NFSERR_NOTDIR,	-ENOTDIR	},
-	{ NFSERR_ISDIR,		-EISDIR		},
-	{ NFSERR_INVAL,		-EINVAL		},
-	{ NFSERR_FBIG,		-EFBIG		},
-	{ NFSERR_NOSPC,		-ENOSPC		},
-	{ NFSERR_ROFS,		-EROFS		},
-	{ NFSERR_MLINK,		-EMLINK		},
-	{ NFSERR_NAMETOOLONG,	-ENAMETOOLONG	},
-	{ NFSERR_NOTEMPTY,	-ENOTEMPTY	},
-	{ NFSERR_DQUOT,		-EDQUOT		},
-	{ NFSERR_STALE,		-ESTALE		},
-	{ NFSERR_REMOTE,	-EREMOTE	},
-#ifdef EWFLUSH
-	{ NFSERR_WFLUSH,	-EWFLUSH	},
-#endif
-	{ NFSERR_BADHANDLE,	-EBADHANDLE	},
-	{ NFSERR_NOT_SYNC,	-ENOTSYNC	},
-	{ NFSERR_BAD_COOKIE,	-EBADCOOKIE	},
-	{ NFSERR_NOTSUPP,	-ENOTSUPP	},
-	{ NFSERR_TOOSMALL,	-ETOOSMALL	},
-	{ NFSERR_SERVERFAULT,	-EREMOTEIO	},
-	{ NFSERR_BADTYPE,	-EBADTYPE	},
-	{ NFSERR_JUKEBOX,	-EJUKEBOX	},
-	{ -1,			-EIO		}
-};
-
-/**
- * nfs_stat_to_errno - convert an NFS status code to a local errno
- * @status: NFS status code to convert
- *
- * Returns a local errno value, or -EIO if the NFS status code is
- * not recognized.  This function is used jointly by NFSv2 and NFSv3.
- */
-static int nfs_stat_to_errno(enum nfs_stat status)
-{
-	int i;
-
-	for (i = 0; nfs_errtbl[i].stat != -1; i++) {
-		if (nfs_errtbl[i].stat == (int)status)
-			return nfs_errtbl[i].errno;
-	}
-	dprintk("NFS: Unrecognized nfs status value: %u\n", status);
-	return nfs_errtbl[i].errno;
-}
-
 #define PROC(proc, argtype, restype, timer)				\
 [NFSPROC_##proc] = {							\
    .p_proc	    =  NFSPROC_##proc,					\
diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c
index d48db2f6f4f02..6299837f39086 100644
--- a/fs/nfs/nfs3xdr.c
+++ b/fs/nfs/nfs3xdr.c
@@ -21,14 +21,13 @@
 #include <linux/nfs3.h>
 #include <linux/nfs_fs.h>
 #include <linux/nfsacl.h>
+#include <linux/nfs_common.h>
+
 #include "nfstrace.h"
 #include "internal.h"
#define NFSDBG_FACILITY		NFSDBG_XDR
-/* Mapping from NFS error code to "errno" error code. */
-#define errno_NFSERR_IO		EIO
-
 /*
  * Declare the space requirements for NFS arguments and replies as
  * number of 32bit-words
@@ -91,8 +90,6 @@
    			NFS3_pagepad_sz)
 #define ACL3_setaclres_sz	(1+NFS3_post_op_attr_sz)
-static int nfs3_stat_to_errno(enum nfs_stat);
-
 /*
  * Map file type to S_IFMT bits
  */
@@ -1405,7 +1402,7 @@ static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
 out:
    return error;
 out_default:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/*
@@ -1444,7 +1441,7 @@ static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
 out:
    return error;
 out_status:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/*
@@ -1494,7 +1491,7 @@ static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
    error = decode_post_op_attr(xdr, result->dir_attr, userns);
    if (unlikely(error))
    	goto out;
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/*
@@ -1536,7 +1533,7 @@ static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
 out:
    return error;
 out_default:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/*
@@ -1577,7 +1574,7 @@ static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
 out:
    return error;
 out_default:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/*
@@ -1657,7 +1654,7 @@ static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
 out:
    return error;
 out_status:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/*
@@ -1727,7 +1724,7 @@ static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
 out:
    return error;
 out_status:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/*
@@ -1794,7 +1791,7 @@ static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
    error = decode_wcc_data(xdr, result->dir_attr, userns);
    if (unlikely(error))
    	goto out;
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/*
@@ -1834,7 +1831,7 @@ static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
 out:
    return error;
 out_status:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/*
@@ -1880,7 +1877,7 @@ static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
 out:
    return error;
 out_status:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/*
@@ -1925,7 +1922,7 @@ static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
 out:
    return error;
 out_status:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/**
@@ -2101,7 +2098,7 @@ static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
    error = decode_post_op_attr(xdr, result->dir_attr, rpc_rqst_userns(req));
    if (unlikely(error))
    	goto out;
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/*
@@ -2167,7 +2164,7 @@ static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
 out:
    return error;
 out_status:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/*
@@ -2243,7 +2240,7 @@ static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
 out:
    return error;
 out_status:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/*
@@ -2304,7 +2301,7 @@ static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
 out:
    return error;
 out_status:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
/*
@@ -2350,7 +2347,7 @@ static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
 out:
    return error;
 out_status:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
#ifdef CONFIG_NFS_V3_ACL
@@ -2416,7 +2413,7 @@ static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
 out:
    return error;
 out_default:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
@@ -2435,76 +2432,11 @@ static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
 out:
    return error;
 out_default:
-	return nfs3_stat_to_errno(status);
+	return nfs_stat_to_errno(status);
 }
#endif  /* CONFIG_NFS_V3_ACL */
-
-/*
- * We need to translate between nfs status return values and
- * the local errno values which may not be the same.
- */
-static const struct {
-	int stat;
-	int errno;
-} nfs_errtbl[] = {
-	{ NFS_OK,		0		},
-	{ NFSERR_PERM,		-EPERM		},
-	{ NFSERR_NOENT,		-ENOENT		},
-	{ NFSERR_IO,		-errno_NFSERR_IO},
-	{ NFSERR_NXIO,		-ENXIO		},
-/*	{ NFSERR_EAGAIN,	-EAGAIN		}, */
-	{ NFSERR_ACCES,		-EACCES		},
-	{ NFSERR_EXIST,		-EEXIST		},
-	{ NFSERR_XDEV,		-EXDEV		},
-	{ NFSERR_NODEV,		-ENODEV		},
-	{ NFSERR_NOTDIR,	-ENOTDIR	},
-	{ NFSERR_ISDIR,		-EISDIR		},
-	{ NFSERR_INVAL,		-EINVAL		},
-	{ NFSERR_FBIG,		-EFBIG		},
-	{ NFSERR_NOSPC,		-ENOSPC		},
-	{ NFSERR_ROFS,		-EROFS		},
-	{ NFSERR_MLINK,		-EMLINK		},
-	{ NFSERR_NAMETOOLONG,	-ENAMETOOLONG	},
-	{ NFSERR_NOTEMPTY,	-ENOTEMPTY	},
-	{ NFSERR_DQUOT,		-EDQUOT		},
-	{ NFSERR_STALE,		-ESTALE		},
-	{ NFSERR_REMOTE,	-EREMOTE	},
-#ifdef EWFLUSH
-	{ NFSERR_WFLUSH,	-EWFLUSH	},
-#endif
-	{ NFSERR_BADHANDLE,	-EBADHANDLE	},
-	{ NFSERR_NOT_SYNC,	-ENOTSYNC	},
-	{ NFSERR_BAD_COOKIE,	-EBADCOOKIE	},
-	{ NFSERR_NOTSUPP,	-ENOTSUPP	},
-	{ NFSERR_TOOSMALL,	-ETOOSMALL	},
-	{ NFSERR_SERVERFAULT,	-EREMOTEIO	},
-	{ NFSERR_BADTYPE,	-EBADTYPE	},
-	{ NFSERR_JUKEBOX,	-EJUKEBOX	},
-	{ -1,			-EIO		}
-};
-
-/**
- * nfs3_stat_to_errno - convert an NFS status code to a local errno
- * @status: NFS status code to convert
- *
- * Returns a local errno value, or -EIO if the NFS status code is
- * not recognized.  This function is used jointly by NFSv2 and NFSv3.
- */
-static int nfs3_stat_to_errno(enum nfs_stat status)
-{
-	int i;
-
-	for (i = 0; nfs_errtbl[i].stat != -1; i++) {
-		if (nfs_errtbl[i].stat == (int)status)
-			return nfs_errtbl[i].errno;
-	}
-	dprintk("NFS: Unrecognized nfs status value: %u\n", status);
-	return nfs_errtbl[i].errno;
-}
-
-
 #define PROC(proc, argtype, restype, timer)				\
 [NFS3PROC_##proc] = {							\
    .p_proc      = NFS3PROC_##proc,					\
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 0ae9e06a0bba2..94391193cb8f8 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -52,6 +52,7 @@
 #include <linux/nfs.h>
 #include <linux/nfs4.h>
 #include <linux/nfs_fs.h>
+#include <linux/nfs_common.h>
#include "nfs4_fs.h"
 #include "nfs4trace.h"
@@ -63,9 +64,6 @@
#define NFSDBG_FACILITY		NFSDBG_XDR
-/* Mapping from NFS error code to "errno" error code. */
-#define errno_NFSERR_IO		EIO
-
 struct compound_hdr;
 static int nfs4_stat_to_errno(int);
 static void encode_layoutget(struct xdr_stream *xdr,
diff --git a/fs/nfs_common/Makefile b/fs/nfs_common/Makefile
index 119c75ab9fd08..e58b01bb8dda6 100644
--- a/fs/nfs_common/Makefile
+++ b/fs/nfs_common/Makefile
@@ -8,3 +8,5 @@ nfs_acl-objs := nfsacl.o
obj-$(CONFIG_GRACE_PERIOD) += grace.o
 obj-$(CONFIG_NFS_V4_2_SSC_HELPER) += nfs_ssc.o
+
+obj-$(CONFIG_NFS_COMMON) += common.o
diff --git a/fs/nfs_common/common.c b/fs/nfs_common/common.c
new file mode 100644
index 0000000000000..a4ee95da2174e
--- /dev/null
+++ b/fs/nfs_common/common.c
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/module.h>
+#include <linux/nfs_common.h>
+
+/*
+ * We need to translate between nfs status return values and
+ * the local errno values which may not be the same.
+ */
+static const struct {
+	int stat;
+	int errno;
+} nfs_errtbl[] = {
+	{ NFS_OK,		0		},
+	{ NFSERR_PERM,		-EPERM		},
+	{ NFSERR_NOENT,		-ENOENT		},
+	{ NFSERR_IO,		-errno_NFSERR_IO},
+	{ NFSERR_NXIO,		-ENXIO		},
+/*	{ NFSERR_EAGAIN,	-EAGAIN		}, */
+	{ NFSERR_ACCES,		-EACCES		},
+	{ NFSERR_EXIST,		-EEXIST		},
+	{ NFSERR_XDEV,		-EXDEV		},
+	{ NFSERR_NODEV,		-ENODEV		},
+	{ NFSERR_NOTDIR,	-ENOTDIR	},
+	{ NFSERR_ISDIR,		-EISDIR		},
+	{ NFSERR_INVAL,		-EINVAL		},
+	{ NFSERR_FBIG,		-EFBIG		},
+	{ NFSERR_NOSPC,		-ENOSPC		},
+	{ NFSERR_ROFS,		-EROFS		},
+	{ NFSERR_MLINK,		-EMLINK		},
+	{ NFSERR_NAMETOOLONG,	-ENAMETOOLONG	},
+	{ NFSERR_NOTEMPTY,	-ENOTEMPTY	},
+	{ NFSERR_DQUOT,		-EDQUOT		},
+	{ NFSERR_STALE,		-ESTALE		},
+	{ NFSERR_REMOTE,	-EREMOTE	},
+#ifdef EWFLUSH
+	{ NFSERR_WFLUSH,	-EWFLUSH	},
+#endif
+	{ NFSERR_BADHANDLE,	-EBADHANDLE	},
+	{ NFSERR_NOT_SYNC,	-ENOTSYNC	},
+	{ NFSERR_BAD_COOKIE,	-EBADCOOKIE	},
+	{ NFSERR_NOTSUPP,	-ENOTSUPP	},
+	{ NFSERR_TOOSMALL,	-ETOOSMALL	},
+	{ NFSERR_SERVERFAULT,	-EREMOTEIO	},
+	{ NFSERR_BADTYPE,	-EBADTYPE	},
+	{ NFSERR_JUKEBOX,	-EJUKEBOX	},
+	{ -1,			-EIO		}
+};
+
+/**
+ * nfs_stat_to_errno - convert an NFS status code to a local errno
+ * @status: NFS status code to convert
+ *
+ * Returns a local errno value, or -EIO if the NFS status code is
+ * not recognized.  This function is used jointly by NFSv2 and NFSv3.
+ */
+int nfs_stat_to_errno(enum nfs_stat status)
+{
+	int i;
+
+	for (i = 0; nfs_errtbl[i].stat != -1; i++) {
+		if (nfs_errtbl[i].stat == (int)status)
+			return nfs_errtbl[i].errno;
+	}
+	return nfs_errtbl[i].errno;
+}
+EXPORT_SYMBOL_GPL(nfs_stat_to_errno);
diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
index 73367b41e4fae..4e7d8d926b908 100644
--- a/fs/nfsd/Kconfig
+++ b/fs/nfsd/Kconfig
@@ -8,6 +8,7 @@ config NFSD
    select LOCKD
    select SUNRPC
    select EXPORTFS
+	select NFS_COMMON
    select NFS_ACL_SUPPORT if NFSD_V2_ACL
    select NFS_ACL_SUPPORT if NFSD_V3_ACL
    depends on MULTIUSER
diff --git a/include/linux/nfs_common.h b/include/linux/nfs_common.h
new file mode 100644
index 0000000000000..3395c4a4d3720
--- /dev/null
+++ b/include/linux/nfs_common.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This file contains constants and methods used by both NFS client and server.
+ */
+#ifndef _LINUX_NFS_COMMON_H
+#define _LINUX_NFS_COMMON_H
+
+#include <linux/errno.h>
+#include <uapi/linux/nfs.h>
+
+/* Mapping from NFS error code to "errno" error code. */
+#define errno_NFSERR_IO EIO
+
+int nfs_stat_to_errno(enum nfs_stat status);
+
+#endif /* _LINUX_NFS_COMMON_H */
-- 
2.51.0



    

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[PATCH 5.15.y 2/3] nfs_common: factor out nfs_errtbl and nfs_stat_to_errno