JFS: Implement jfs_init_security

This atomically initializes the security xattr when an object is created

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/fs/jfs/xattr.c b/fs/jfs/xattr.c
index 35674b2a0e6c..23aa5066b5a4 100644
--- a/fs/jfs/xattr.c
+++ b/fs/jfs/xattr.c
@@ -21,6 +21,7 @@
 #include <linux/xattr.h>
 #include <linux/posix_acl_xattr.h>
 #include <linux/quotaops.h>
+#include <linux/security.h>
 #include "jfs_incore.h"
 #include "jfs_superblock.h"
 #include "jfs_dmap.h"
@@ -1148,3 +1149,38 @@ int jfs_removexattr(struct dentry *dentry, const char *name)
 
         return rc;
 }
+
+#ifdef CONFIG_JFS_SECURITY
+int jfs_init_security(tid_t tid, struct inode *inode, struct inode *dir)
+{
+        int rc;
+        size_t len;
+        void *value;
+        char *suffix;
+        char *name;
+
+        rc = security_inode_init_security(inode, dir, &suffix, &value, &len);
+        if (rc) {
+                if (rc == -EOPNOTSUPP)
+                        return 0;
+                return rc;
+        }
+        name = kmalloc(XATTR_SECURITY_PREFIX_LEN + 1 + strlen(suffix),
+                       GFP_NOFS);
+        if (!name) {
+                rc = -ENOMEM;
+                goto kmalloc_failed;
+        }
+        strcpy(name, XATTR_SECURITY_PREFIX);
+        strcpy(name + XATTR_SECURITY_PREFIX_LEN, suffix);
+
+        rc = __jfs_setxattr(tid, inode, name, value, len, 0);
+
+        kfree(name);
+kmalloc_failed:
+        kfree(suffix);
+        kfree(value);
+
+        return rc;
+}
+#endif