NFS: Create an NFS v3 stat_to_errno()

In theory, NFS v3 can have different error versions than NFS v2. v4 is
already using its own nfs4_stat_to_errno() to map error codes, so
rather than create something in the generic client for v2 and v3 to
share I instead give v3 its own function.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

3 files changed, 87 insertions, 20 deletions

diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 4e9b0ff30f66..bf64095f850d 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -208,7 +208,6 @@ extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
 
 /* nfs2xdr.c */
-extern int nfs_stat_to_errno(enum nfs_stat);
 extern struct rpc_procinfo nfs_procedures[];
 extern int nfs2_decode_dirent(struct xdr_stream *,
                                 struct nfs_entry *, int);
diff --git a/fs/nfs/nfs2xdr.c b/fs/nfs/nfs2xdr.c
index c99008e9d8a4..baf759bccd05 100644
--- a/fs/nfs/nfs2xdr.c
+++ b/fs/nfs/nfs2xdr.c
@@ -61,6 +61,7 @@
 #define NFS_readdirres_sz       (1)
 #define NFS_statfsres_sz        (1+NFS_info_sz)
 
+static int nfs_stat_to_errno(enum nfs_stat);
 
 /*
  * While encoding arguments, set up the reply buffer in advance to
@@ -1111,7 +1112,7 @@ static const struct {
  * 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)
+static int nfs_stat_to_errno(enum nfs_stat status)
 {
         int i;
 
diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c
index ee284c2b2757..902de489ec9b 100644
--- a/fs/nfs/nfs3xdr.c
+++ b/fs/nfs/nfs3xdr.c
@@ -86,6 +86,8 @@
                                 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
 #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
  */
@@ -1388,7 +1390,7 @@ static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
 out:
         return error;
 out_default:
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /*
@@ -1427,7 +1429,7 @@ static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
 out:
         return error;
 out_status:
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /*
@@ -1475,7 +1477,7 @@ out_default:
         error = decode_post_op_attr(xdr, result->dir_attr);
         if (unlikely(error))
                 goto out;
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /*
@@ -1516,7 +1518,7 @@ static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
 out:
         return error;
 out_default:
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /*
@@ -1557,7 +1559,7 @@ static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
 out:
         return error;
 out_default:
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /*
@@ -1639,7 +1641,7 @@ static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
 out:
         return error;
 out_status:
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /*
@@ -1709,7 +1711,7 @@ static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
 out:
         return error;
 out_status:
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /*
@@ -1773,7 +1775,7 @@ out_default:
         error = decode_wcc_data(xdr, result->dir_attr);
         if (unlikely(error))
                 goto out;
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /*
@@ -1812,7 +1814,7 @@ static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
 out:
         return error;
 out_status:
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /*
@@ -1856,7 +1858,7 @@ static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
 out:
         return error;
 out_status:
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /*
@@ -1899,7 +1901,7 @@ static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
 out:
         return error;
 out_status:
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /**
@@ -2091,7 +2093,7 @@ out_default:
         error = decode_post_op_attr(xdr, result->dir_attr);
         if (unlikely(error))
                 goto out;
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /*
@@ -2159,7 +2161,7 @@ static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
 out:
         return error;
 out_status:
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /*
@@ -2235,7 +2237,7 @@ static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
 out:
         return error;
 out_status:
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /*
@@ -2298,7 +2300,7 @@ static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
 out:
         return error;
 out_status:
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 /*
@@ -2339,7 +2341,7 @@ static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
 out:
         return error;
 out_status:
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 #ifdef CONFIG_NFS_V3_ACL
@@ -2404,7 +2406,7 @@ static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
 out:
         return error;
 out_default:
-        return nfs_stat_to_errno(status);
+        return nfs3_stat_to_errno(status);
 }
 
 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
@@ -2423,11 +2425,76 @@ static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
 out:
         return error;
 out_default:
-        return nfs_stat_to_errno(status);
+        return nfs3_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,                                 \