Convert ext4 to use unlocked_ioctl

I checked ext4_ioctl and it looked largely safe to not be used
without BKL.  So convert it over to unlocked_ioctl.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

4 files changed, 6 insertions, 13 deletions

diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 2c23bade9aa6..88c97f7312be 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -42,7 +42,7 @@ const struct file_operations ext4_dir_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_read_dir,
         .readdir        = ext4_readdir,         /* we take BKL. needed?*/
-        .ioctl          = ext4_ioctl,           /* BKL held */
+        .unlocked_ioctl = ext4_ioctl,
 #ifdef CONFIG_COMPAT
         .compat_ioctl   = ext4_compat_ioctl,
 #endif
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index ac35ec58db55..20507a24506a 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -129,7 +129,7 @@ const struct file_operations ext4_file_operations = {
         .write          = do_sync_write,
         .aio_read       = generic_file_aio_read,
         .aio_write      = ext4_file_write,
-        .ioctl          = ext4_ioctl,
+        .unlocked_ioctl = ext4_ioctl,
 #ifdef CONFIG_COMPAT
         .compat_ioctl   = ext4_compat_ioctl,
 #endif
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 25b13ede8086..ce937fe432a0 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -18,9 +18,9 @@
 #include <linux/mount.h>
 #include <asm/uaccess.h>
 
-int ext4_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
-                unsigned long arg)
+long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
+        struct inode *inode = filp->f_dentry->d_inode;
         struct ext4_inode_info *ei = EXT4_I(inode);
         unsigned int flags;
         unsigned short rsv_window_size;
@@ -277,9 +277,6 @@ setversion_out:
 #ifdef CONFIG_COMPAT
 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
-        struct inode *inode = file->f_path.dentry->d_inode;
-        int ret;
-
         /* These are just misnamed, they actually get/put from/to user an int */
         switch (cmd) {
         case EXT4_IOC32_GETFLAGS:
@@ -319,9 +316,6 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
         default:
                 return -ENOIOCTLCMD;
         }
-        lock_kernel();
-        ret = ext4_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
-        unlock_kernel();
-        return ret;
+        return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 }
 #endif
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
index 105337ca9ed0..33bc88568c54 100644
--- a/include/linux/ext4_fs.h
+++ b/include/linux/ext4_fs.h
@@ -1050,8 +1050,7 @@ extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
                 struct address_space *mapping, loff_t from);
 
 /* ioctl.c */
-extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
-                       unsigned long);
+extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
 
 /* migrate.c */