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, 36 insertions, 0 deletions

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 0beb023f25ac..a261f1800922 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1014,6 +1014,36 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 }
 
 static __be32
+nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+                struct nfsd4_fallocate *fallocate, int flags)
+{
+        __be32 status = nfserr_notsupp;
+        struct file *file;
+
+        status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
+                                            &fallocate->falloc_stateid,
+                                            WR_STATE, &file);
+        if (status != nfs_ok) {
+                dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
+                return status;
+        }
+
+        status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
+                                     fallocate->falloc_offset,
+                                     fallocate->falloc_length,
+                                     flags);
+        fput(file);
+        return status;
+}
+
+static __be32
+nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+               struct nfsd4_fallocate *fallocate)
+{
+        return nfsd4_fallocate(rqstp, cstate, fallocate, 0);
+}
+
+static __be32
 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                 struct nfsd4_seek *seek)
 {
@@ -1929,6 +1959,12 @@ static struct nfsd4_operation nfsd4_ops[] = {
         },
 
         /* NFSv4.2 operations */
+        [OP_ALLOCATE] = {
+                .op_func = (nfsd4op_func)nfsd4_allocate,
+                .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
+                .op_name = "OP_ALLOCATE",
+                .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
+        },
         [OP_SEEK] = {
                 .op_func = (nfsd4op_func)nfsd4_seek,
                 .op_name = "OP_SEEK",