NFSv4: Decode mounted_on_fileid attribute in getattr.

It is ignored if fileid is also requested. This will be used on referrals
(fs_locations).

Signed-off-by: Manoj Naik <manoj@almaden.ibm.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index f6a1ea7df374..4b6613f61341 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -2326,6 +2326,22 @@ static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t
         return 0;
 }
 
+static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
+{
+        uint32_t *p;
+
+        *fileid = 0;
+        if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
+                return -EIO;
+        if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
+                READ_BUF(8);
+                READ64(*fileid);
+                bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
+        }
+        dprintk("%s: fileid=%Lu\n", __FUNCTION__, (unsigned long long)*fileid);
+        return 0;
+}
+
 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
 {
         uint32_t *p;
@@ -2983,6 +2999,7 @@ static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr, cons
                  bitmap[2] = {0},
                  type;
         int status, fmode = 0;
+        uint64_t fileid;
 
         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
                 goto xdr_error;
@@ -3032,6 +3049,10 @@ static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr, cons
                 goto xdr_error;
         if ((status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime)) != 0)
                 goto xdr_error;
+        if ((status = decode_attr_mounted_on_fileid(xdr, bitmap, &fileid)) != 0)
+                goto xdr_error;
+        if (fattr->fileid == 0 && fileid != 0)
+                fattr->fileid = fileid;
         if ((status = verify_attr_len(xdr, savep, attrlen)) == 0)
                 fattr->valid = NFS_ATTR_FATTR | NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4;
 xdr_error: