4 files changed, 42 insertions, 0 deletions

diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c
index 92ea8265d7d5..3e7a84a1e509 100644
--- a/fs/ext2/dir.c
+++ b/fs/ext2/dir.c
@@ -661,5 +661,8 @@ const struct file_operations ext2_dir_operations = {
         .read           = generic_read_dir,
         .readdir        = ext2_readdir,
         .ioctl          = ext2_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl   = ext2_compat_ioctl,
+#endif
         .fsync          = ext2_sync_file,
 };
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index e65a019fc7a5..c19ac153f56b 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -137,6 +137,7 @@ extern void ext2_set_inode_flags(struct inode *inode);
 /* ioctl.c */
 extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
                        unsigned long);
+extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
 
 /* namei.c */
 struct dentry *ext2_get_parent(struct dentry *child);
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index 23e2c7ccec1d..e8bbed9dd268 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -46,6 +46,9 @@ const struct file_operations ext2_file_operations = {
         .aio_read       = generic_file_aio_read,
         .aio_write      = generic_file_aio_write,
         .ioctl          = ext2_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl   = ext2_compat_ioctl,
+#endif
         .mmap           = generic_file_mmap,
         .open           = generic_file_open,
         .release        = ext2_release_file,
@@ -63,6 +66,9 @@ const struct file_operations ext2_xip_file_operations = {
         .read           = xip_file_read,
         .write          = xip_file_write,
         .ioctl          = ext2_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl   = ext2_compat_ioctl,
+#endif
         .mmap           = xip_file_mmap,
         .open           = generic_file_open,
         .release        = ext2_release_file,
diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c
index 3ca9afdf713d..1dfba77eab10 100644
--- a/fs/ext2/ioctl.c
+++ b/fs/ext2/ioctl.c
@@ -11,6 +11,8 @@
 #include <linux/capability.h>
 #include <linux/time.h>
 #include <linux/sched.h>
+#include <linux/compat.h>
+#include <linux/smp_lock.h>
 #include <asm/current.h>
 #include <asm/uaccess.h>
 
@@ -80,3 +82,33 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
                 return -ENOTTY;
         }
 }
+
+#ifdef CONFIG_COMPAT
+long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+        struct inode *inode = file->f_dentry->d_inode;
+        int ret;
+
+        /* 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;
+        }
+        lock_kernel();
+        ret = ext2_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
+        unlock_kernel();
+        return ret;
+}
+#endif