[PATCH] NFSv4: ACL support for the NFSv4 client: write

 Client-side write support for NFSv4 ACLs.

 Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 33 insertions, 1 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index c91c09938a55..d969dd13e7db 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2216,6 +2216,29 @@ static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
         return ret;
 }
 
+static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
+{
+        struct nfs_server *server = NFS_SERVER(inode);
+        struct page *pages[NFS4ACL_MAXPAGES];
+        struct nfs_setaclargs arg = {
+                .fh             = NFS_FH(inode),
+                .acl_pages      = pages,
+                .acl_len        = buflen,
+        };
+        struct rpc_message msg = {
+                .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
+                .rpc_argp       = &arg,
+                .rpc_resp       = NULL,
+        };
+        int ret;
+
+        if (!nfs4_server_supports_acls(server))
+                return -EOPNOTSUPP;
+        buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
+        ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
+        return ret;
+}
+
 static int
 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server)
 {
@@ -2792,7 +2815,16 @@ nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
                 size_t buflen, int flags)
 {
-        return -EOPNOTSUPP;
+        struct inode *inode = dentry->d_inode;
+
+        if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
+                return -EOPNOTSUPP;
+
+        if (!S_ISREG(inode->i_mode) &&
+            (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
+                return -EPERM;
+
+        return nfs4_proc_set_acl(inode, buf, buflen);
 }
 
 /* The getxattr man page suggests returning -ENODATA for unknown attributes,