ocfs2: Implement compat_ioctl()

We need this to support 32 bit system calls on 64 bit kernels.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

4 files changed, 32 insertions, 0 deletions

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 520a2a6d7670..3b5a1576ae10 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1853,6 +1853,9 @@ const struct file_operations ocfs2_fops = {
         .aio_read       = ocfs2_file_aio_read,
         .aio_write      = ocfs2_file_aio_write,
         .ioctl          = ocfs2_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl   = ocfs2_compat_ioctl,
+#endif
         .splice_read    = ocfs2_file_splice_read,
         .splice_write   = ocfs2_file_splice_write,
 };
@@ -1862,4 +1865,7 @@ const struct file_operations ocfs2_dops = {
         .readdir        = ocfs2_readdir,
         .fsync          = ocfs2_sync_file,
         .ioctl          = ocfs2_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl   = ocfs2_compat_ioctl,
+#endif
 };
diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
index 4768be5f3086..7e59c93751f0 100644
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -134,3 +134,26 @@ int ocfs2_ioctl(struct inode * inode, struct file * filp,
         }
 }
 
+#ifdef CONFIG_COMPAT
+long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
+{
+        struct inode *inode = file->f_path.dentry->d_inode;
+        int ret;
+
+        switch (cmd) {
+        case OCFS2_IOC32_GETFLAGS:
+                cmd = OCFS2_IOC_GETFLAGS;
+                break;
+        case OCFS2_IOC32_SETFLAGS:
+                cmd = OCFS2_IOC_SETFLAGS;
+                break;
+        default:
+                return -ENOIOCTLCMD;
+        }
+
+        lock_kernel();
+        ret = ocfs2_ioctl(inode, file, cmd, arg);
+        unlock_kernel();
+        return ret;
+}
+#endif
diff --git a/fs/ocfs2/ioctl.h b/fs/ocfs2/ioctl.h
index 4a7c82931dba..4d6c4f430d0d 100644
--- a/fs/ocfs2/ioctl.h
+++ b/fs/ocfs2/ioctl.h
@@ -12,5 +12,6 @@
 
 int ocfs2_ioctl(struct inode * inode, struct file * filp,
         unsigned int cmd, unsigned long arg);
+long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg);
 
 #endif /* OCFS2_IOCTL_H */
diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index 71306479c68f..f0d9eb08547a 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -166,6 +166,8 @@
  */
 #define OCFS2_IOC_GETFLAGS      _IOR('f', 1, long)
 #define OCFS2_IOC_SETFLAGS      _IOW('f', 2, long)
+#define OCFS2_IOC32_GETFLAGS    _IOR('f', 1, int)
+#define OCFS2_IOC32_SETFLAGS    _IOW('f', 2, int)
 
 /*
  * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)