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>

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index f6a1ea7df3742196236c80812316303c08d1ce2b..4b6613f61341734bc642c3de29155496bb663942 100644 (file)
--- 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: