Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / gfs2 / acl.c

diff --git a/kernel/fs/gfs2/acl.c b/kernel/fs/gfs2/acl.c
new file mode 100644 (file)
index 0000000..1be3b06
--- /dev/null
+++ b/kernel/fs/gfs2/acl.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License version 2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/xattr.h>
+#include <linux/posix_acl.h>
+#include <linux/posix_acl_xattr.h>
+#include <linux/gfs2_ondisk.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "acl.h"
+#include "xattr.h"
+#include "glock.h"
+#include "inode.h"
+#include "meta_io.h"
+#include "trans.h"
+#include "util.h"
+
+static const char *gfs2_acl_name(int type)
+{
+       switch (type) {
+       case ACL_TYPE_ACCESS:
+               return GFS2_POSIX_ACL_ACCESS;
+       case ACL_TYPE_DEFAULT:
+               return GFS2_POSIX_ACL_DEFAULT;
+       }
+       return NULL;
+}
+
+struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
+{
+       struct gfs2_inode *ip = GFS2_I(inode);
+       struct posix_acl *acl;
+       const char *name;
+       char *data;
+       int len;
+
+       if (!ip->i_eattr)
+               return NULL;
+
+       name = gfs2_acl_name(type);
+       if (name == NULL)
+               return ERR_PTR(-EINVAL);
+
+       len = gfs2_xattr_acl_get(ip, name, &data);
+       if (len < 0)
+               return ERR_PTR(len);
+       if (len == 0)
+               return NULL;
+
+       acl = posix_acl_from_xattr(&init_user_ns, data, len);
+       kfree(data);
+       return acl;
+}
+
+int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+{
+       int error;
+       int len;
+       char *data;
+       const char *name = gfs2_acl_name(type);
+
+       BUG_ON(name == NULL);
+
+       if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
+               return -E2BIG;
+
+       if (type == ACL_TYPE_ACCESS) {
+               umode_t mode = inode->i_mode;
+
+               error = posix_acl_equiv_mode(acl, &mode);
+               if (error < 0)
+                       return error;
+
+               if (error == 0)
+                       acl = NULL;
+
+               if (mode != inode->i_mode) {
+                       inode->i_mode = mode;
+                       mark_inode_dirty(inode);
+               }
+       }
+
+       if (acl) {
+               len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0);
+               if (len == 0)
+                       return 0;
+               data = kmalloc(len, GFP_NOFS);
+               if (data == NULL)
+                       return -ENOMEM;
+               error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
+               if (error < 0)
+                       goto out;
+       } else {
+               data = NULL;
+               len = 0;
+       }
+
+       error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
+       if (error)
+               goto out;
+       set_cached_acl(inode, type, acl);
+out:
+       kfree(data);
+       return error;
+}