v4.19.13 snapshot.
diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c
new file mode 100644
index 0000000..0367c00
--- /dev/null
+++ b/fs/ext2/ioctl.c
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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/capability.h>
+#include <linux/time.h>
+#include <linux/sched.h>
+#include <linux/compat.h>
+#include <linux/mount.h>
+#include <asm/current.h>
+#include <linux/uaccess.h>
+
+
+long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct inode *inode = file_inode(filp);
+ struct ext2_inode_info *ei = EXT2_I(inode);
+ unsigned int flags;
+ unsigned short rsv_window_size;
+ int ret;
+
+ 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;
+
+ ret = mnt_want_write_file(filp);
+ if (ret)
+ return ret;
+
+ if (!inode_owner_or_capable(inode)) {
+ ret = -EACCES;
+ goto setflags_out;
+ }
+
+ if (get_user(flags, (int __user *) arg)) {
+ ret = -EFAULT;
+ goto setflags_out;
+ }
+
+ flags = ext2_mask_flags(inode->i_mode, flags);
+
+ inode_lock(inode);
+ /* Is it quota file? Do not allow user to mess with it */
+ if (IS_NOQUOTA(inode)) {
+ inode_unlock(inode);
+ ret = -EPERM;
+ goto setflags_out;
+ }
+ 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)) {
+ inode_unlock(inode);
+ ret = -EPERM;
+ goto setflags_out;
+ }
+ }
+
+ 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(inode);
+ inode_unlock(inode);
+
+ mark_inode_dirty(inode);
+setflags_out:
+ mnt_drop_write_file(filp);
+ return ret;
+ }
+ case EXT2_IOC_GETVERSION:
+ return put_user(inode->i_generation, (int __user *) arg);
+ case EXT2_IOC_SETVERSION: {
+ __u32 generation;
+
+ if (!inode_owner_or_capable(inode))
+ return -EPERM;
+ ret = mnt_want_write_file(filp);
+ if (ret)
+ return ret;
+ if (get_user(generation, (int __user *) arg)) {
+ ret = -EFAULT;
+ goto setversion_out;
+ }
+
+ inode_lock(inode);
+ inode->i_ctime = current_time(inode);
+ inode->i_generation = generation;
+ inode_unlock(inode);
+
+ mark_inode_dirty(inode);
+setversion_out:
+ mnt_drop_write_file(filp);
+ return ret;
+ }
+ case EXT2_IOC_GETRSVSZ:
+ if (test_opt(inode->i_sb, RESERVATION)
+ && S_ISREG(inode->i_mode)
+ && ei->i_block_alloc_info) {
+ rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
+ return put_user(rsv_window_size, (int __user *)arg);
+ }
+ return -ENOTTY;
+ case EXT2_IOC_SETRSVSZ: {
+
+ if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
+ return -ENOTTY;
+
+ if (!inode_owner_or_capable(inode))
+ return -EACCES;
+
+ if (get_user(rsv_window_size, (int __user *)arg))
+ return -EFAULT;
+
+ ret = mnt_want_write_file(filp);
+ if (ret)
+ return ret;
+
+ if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
+ rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;
+
+ /*
+ * need to allocate reservation structure for this inode
+ * before set the window size
+ */
+ /*
+ * XXX What lock should protect the rsv_goal_size?
+ * Accessed in ext2_get_block only. ext3 uses i_truncate.
+ */
+ mutex_lock(&ei->truncate_mutex);
+ if (!ei->i_block_alloc_info)
+ ext2_init_block_alloc_info(inode);
+
+ if (ei->i_block_alloc_info){
+ struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
+ rsv->rsv_goal_size = rsv_window_size;
+ }
+ mutex_unlock(&ei->truncate_mutex);
+ mnt_drop_write_file(filp);
+ return 0;
+ }
+ default:
+ return -ENOTTY;
+ }
+}
+
+#ifdef CONFIG_COMPAT
+long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ /* These are just misnamed, they actually get/put from/to user an int */
+ switch (cmd) {
+ case EXT2_IOC32_GETFLAGS:
+ cmd = EXT2_IOC_GETFLAGS;
+ break;
+ case EXT2_IOC32_SETFLAGS:
+ cmd = EXT2_IOC_SETFLAGS;
+ break;
+ case EXT2_IOC32_GETVERSION:
+ cmd = EXT2_IOC_GETVERSION;
+ break;
+ case EXT2_IOC32_SETVERSION:
+ cmd = EXT2_IOC_SETVERSION;
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
+}
+#endif