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-rw-r--r--fs/ext2/ioctl.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c
new file mode 100644
index 000000000000..709d8676b962
--- /dev/null
+++ b/fs/ext2/ioctl.c
@@ -0,0 +1,81 @@
+/*
+ * linux/fs/ext2/ioctl.c
+ *
+ * Copyright (C) 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ */
+
+#include "ext2.h"
+#include <linux/time.h>
+#include <linux/sched.h>
+#include <asm/current.h>
+#include <asm/uaccess.h>
+
+
+int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
+ unsigned long arg)
+{
+ struct ext2_inode_info *ei = EXT2_I(inode);
+ unsigned int flags;
+
+ ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
+
+ switch (cmd) {
+ case EXT2_IOC_GETFLAGS:
+ flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
+ return put_user(flags, (int __user *) arg);
+ case EXT2_IOC_SETFLAGS: {
+ unsigned int oldflags;
+
+ if (IS_RDONLY(inode))
+ return -EROFS;
+
+ if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+ return -EACCES;
+
+ if (get_user(flags, (int __user *) arg))
+ return -EFAULT;
+
+ if (!S_ISDIR(inode->i_mode))
+ flags &= ~EXT2_DIRSYNC_FL;
+
+ oldflags = ei->i_flags;
+
+ /*
+ * The IMMUTABLE and APPEND_ONLY flags can only be changed by
+ * the relevant capability.
+ *
+ * This test looks nicer. Thanks to Pauline Middelink
+ */
+ if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
+ if (!capable(CAP_LINUX_IMMUTABLE))
+ return -EPERM;
+ }
+
+ flags = flags & EXT2_FL_USER_MODIFIABLE;
+ flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
+ ei->i_flags = flags;
+
+ ext2_set_inode_flags(inode);
+ inode->i_ctime = CURRENT_TIME_SEC;
+ mark_inode_dirty(inode);
+ return 0;
+ }
+ case EXT2_IOC_GETVERSION:
+ return put_user(inode->i_generation, (int __user *) arg);
+ case EXT2_IOC_SETVERSION:
+ if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+ return -EPERM;
+ if (IS_RDONLY(inode))
+ return -EROFS;
+ if (get_user(inode->i_generation, (int __user *) arg))
+ return -EFAULT;
+ inode->i_ctime = CURRENT_TIME_SEC;
+ mark_inode_dirty(inode);
+ return 0;
+ default:
+ return -ENOTTY;
+ }
+}