nfsd4: clean up S_IS -> NF4 file type mapping

A slightly unconventional approach to make the code more compact I could
live with, but let's give the poor reader *some* chance.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 14 insertions, 7 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index f8109960525..51ec1f27450 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1772,12 +1772,19 @@ static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
         return 0;
 }
 
-static u32 nfs4_ftypes[16] = {
-        NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
-        NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
-        NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
-        NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
-};
+static u32 nfs4_file_type(umode_t mode)
+{
+        switch (mode & S_IFMT) {
+        case S_IFIFO:   return NF4FIFO;
+        case S_IFCHR:   return NF4CHR;
+        case S_IFDIR:   return NF4DIR;
+        case S_IFBLK:   return NF4BLK;
+        case S_IFLNK:   return NF4LNK;
+        case S_IFREG:   return NF4REG;
+        case S_IFSOCK:  return NF4SOCK;
+        default:        return NF4BAD;
+        };
+}
 
 static __be32
 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
@@ -1966,7 +1973,7 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
         if (bmval0 & FATTR4_WORD0_TYPE) {
                 if ((buflen -= 4) < 0)
                         goto out_resource;
-                dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
+                dummy = nfs4_file_type(stat.mode);
                 if (dummy == NF4BAD)
                         goto out_serverfault;
                 WRITE32(dummy);