nfsd: Add ALLOCATE support

The ALLOCATE operation is used to preallocate space in a file.  I can do
this by using vfs_fallocate() to do the actual preallocation.

ALLOCATE only returns a status indicator, so we don't need to write a
special encode() function.

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

1 files changed, 18 insertions, 1 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index eeea7a90eb87..a60cff86fc28 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1514,6 +1514,23 @@ static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, str
 }
 
 static __be32
+nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
+                       struct nfsd4_fallocate *fallocate)
+{
+        DECODE_HEAD;
+
+        status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
+        if (status)
+                return status;
+
+        READ_BUF(16);
+        p = xdr_decode_hyper(p, &fallocate->falloc_offset);
+        xdr_decode_hyper(p, &fallocate->falloc_length);
+
+        DECODE_TAIL;
+}
+
+static __be32
 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
 {
         DECODE_HEAD;
@@ -1604,7 +1621,7 @@ static nfsd4_dec nfsd4_dec_ops[] = {
         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
 
         /* new operations for NFSv4.2 */
-        [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_notsupp,
+        [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_notsupp,
         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_notsupp,