fat: convert to unlocked_ioctl

FAT does not require the BKL in its ioctl function, which is already serialized
through a mutex. Since we're already touching the ioctl code, also fix the
missing handling of FAT_IOCTL_GET_ATTRIBUTES in the compat code.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>

3 files changed, 24 insertions, 10 deletions

diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index 20a1b92e035e..ee42b9e0b16a 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -753,9 +753,10 @@ static int fat_ioctl_readdir(struct inode *inode, struct file *filp,
         return ret;
 }
 
-static int fat_dir_ioctl(struct inode *inode, struct file *filp,
-                         unsigned int cmd, unsigned long arg)
+static long fat_dir_ioctl(struct file *filp, unsigned int cmd,
+                          unsigned long arg)
 {
+        struct inode *inode = filp->f_path.dentry->d_inode;
         struct __fat_dirent __user *d1 = (struct __fat_dirent __user *)arg;
         int short_only, both;
 
@@ -769,7 +770,7 @@ static int fat_dir_ioctl(struct inode *inode, struct file *filp,
                 both = 1;
                 break;
         default:
-                return fat_generic_ioctl(inode, filp, cmd, arg);
+                return fat_generic_ioctl(filp, cmd, arg);
         }
 
         if (!access_ok(VERIFY_WRITE, d1, sizeof(struct __fat_dirent[2])))
@@ -809,7 +810,7 @@ static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd,
                 both = 1;
                 break;
         default:
-                return -ENOIOCTLCMD;
+                return fat_generic_ioctl(filp, cmd, (unsigned long)arg);
         }
 
         if (!access_ok(VERIFY_WRITE, d1, sizeof(struct compat_dirent[2])))
@@ -831,7 +832,7 @@ const struct file_operations fat_dir_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_read_dir,
         .readdir        = fat_readdir,
-        .ioctl          = fat_dir_ioctl,
+        .unlocked_ioctl = fat_dir_ioctl,
 #ifdef CONFIG_COMPAT
         .compat_ioctl   = fat_compat_dir_ioctl,
 #endif
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index e6efdfa0f6db..eb821ee1a333 100644
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -298,8 +298,8 @@ extern int fat_free_clusters(struct inode *inode, int cluster);
 extern int fat_count_free_clusters(struct super_block *sb);
 
 /* fat/file.c */
-extern int fat_generic_ioctl(struct inode *inode, struct file *filp,
-                             unsigned int cmd, unsigned long arg);
+extern long fat_generic_ioctl(struct file *filp, unsigned int cmd,
+                              unsigned long arg);
 extern const struct file_operations fat_file_operations;
 extern const struct inode_operations fat_file_inode_operations;
 extern int fat_setattr(struct dentry * dentry, struct iattr * attr);
diff --git a/fs/fat/file.c b/fs/fat/file.c
index e8c159de236b..a14c2f6a489e 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -8,6 +8,7 @@
 
 #include <linux/capability.h>
 #include <linux/module.h>
+#include <linux/compat.h>
 #include <linux/mount.h>
 #include <linux/time.h>
 #include <linux/buffer_head.h>
@@ -114,9 +115,9 @@ out:
         return err;
 }
 
-int fat_generic_ioctl(struct inode *inode, struct file *filp,
-                      unsigned int cmd, unsigned long arg)
+long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
+        struct inode *inode = filp->f_path.dentry->d_inode;
         u32 __user *user_attr = (u32 __user *)arg;
 
         switch (cmd) {
@@ -129,6 +130,15 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp,
         }
 }
 
+#ifdef CONFIG_COMPAT
+static long fat_generic_compat_ioctl(struct file *filp, unsigned int cmd,
+                                      unsigned long arg)
+
+{
+        return fat_generic_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
 static int fat_file_release(struct inode *inode, struct file *filp)
 {
         if ((filp->f_mode & FMODE_WRITE) &&
@@ -159,7 +169,10 @@ const struct file_operations fat_file_operations = {
         .aio_write      = generic_file_aio_write,
         .mmap           = generic_file_mmap,
         .release        = fat_file_release,
-        .ioctl          = fat_generic_ioctl,
+        .unlocked_ioctl = fat_generic_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl   = fat_generic_compat_ioctl,
+#endif
         .fsync          = fat_file_fsync,
         .splice_read    = generic_file_splice_read,
 };