bkl: Remove locked .ioctl file operation

The last user is gone, so we can safely remove this

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: John Kacur <jkacur@redhat.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index bbcc156..2db4283 100644 (file)
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -374,8 +374,6 @@ prototypes:
        ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
        int (*readdir) (struct file *, void *, filldir_t);
        unsigned int (*poll) (struct file *, struct poll_table_struct *);
-       int (*ioctl) (struct inode *, struct file *, unsigned int,
-                       unsigned long);
        long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
        long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
        int (*mmap) (struct file *, struct vm_area_struct *);
@@ -409,8 +407,7 @@ write:                      no
 aio_write:             no
 readdir:               no
 poll:                  no
-ioctl:                 yes     (see below)
-unlocked_ioctl:                no      (see below)
+unlocked_ioctl:                no
 compat_ioctl:          no
 mmap:                  no
 open:                  no
@@ -453,9 +450,6 @@ move ->readdir() to inode_operations and use a separate method for directory
 anything that resembles union-mount we won't have a struct file for all
 components. And there are other reasons why the current interface is a mess...
 
-->ioctl() on regular files is superceded by the ->unlocked_ioctl() that
-doesn't take the BKL.
-
 ->read on directories probably must go away - we should just enforce -EISDIR
 in sys_read() and friends.
 

diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 94677e7..ed7e5ef 100644 (file)
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -727,7 +727,6 @@ struct file_operations {
        ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
        int (*readdir) (struct file *, void *, filldir_t);
        unsigned int (*poll) (struct file *, struct poll_table_struct *);
-       int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
        long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
        long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
        int (*mmap) (struct file *, struct vm_area_struct *);
@@ -768,10 +767,7 @@ otherwise noted.
        activity on this file and (optionally) go to sleep until there
        is activity. Called by the select(2) and poll(2) system calls
 
-  ioctl: called by the ioctl(2) system call
-
-  unlocked_ioctl: called by the ioctl(2) system call. Filesystems that do not
-       require the BKL should use this method instead of the ioctl() above.
+  unlocked_ioctl: called by the ioctl(2) system call.
 
   compat_ioctl: called by the ioctl(2) system call when 32 bit system calls
         are used on 64 bit kernels.

diff --git a/fs/bad_inode.c b/fs/bad_inode.c
index 52e59bf..f024d8a 100644 (file)
--- a/fs/bad_inode.c
+++ b/fs/bad_inode.c
@@ -55,12 +55,6 @@ static unsigned int bad_file_poll(struct file *filp, poll_table *wait)
        return POLLERR;
 }
 
-static int bad_file_ioctl (struct inode *inode, struct file *filp,
-                       unsigned int cmd, unsigned long arg)
-{
-       return -EIO;
-}
-
 static long bad_file_unlocked_ioctl(struct file *file, unsigned cmd,
                        unsigned long arg)
 {
@@ -159,7 +153,6 @@ static const struct file_operations bad_file_ops =
        .aio_write      = bad_file_aio_write,
        .readdir        = bad_file_readdir,
        .poll           = bad_file_poll,
-       .ioctl          = bad_file_ioctl,
        .unlocked_ioctl = bad_file_unlocked_ioctl,
        .compat_ioctl   = bad_file_compat_ioctl,
        .mmap           = bad_file_mmap,

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 70227e0..03e59aa 100644 (file)
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -1699,8 +1699,7 @@ asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
                                goto out_fput;
                }
 
-               if (!filp->f_op ||
-                   (!filp->f_op->ioctl && !filp->f_op->unlocked_ioctl))
+               if (!filp->f_op || !filp->f_op->unlocked_ioctl)
                        goto do_ioctl;
                break;
        }

diff --git a/fs/ioctl.c b/fs/ioctl.c
index 2d140a7..f855ea4 100644 (file)
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -29,7 +29,6 @@
  * @arg:       command-specific argument for ioctl
  *
  * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
- * invokes filesystem specific ->ioctl method.  If neither method exists,
  * returns -ENOTTY.
  *
  * Returns 0 on success, -errno on error.
@@ -39,21 +38,12 @@ static long vfs_ioctl(struct file *filp, unsigned int cmd,
 {
        int error = -ENOTTY;
 
-       if (!filp->f_op)
+       if (!filp->f_op || !filp->f_op->unlocked_ioctl)
                goto out;
 
-       if (filp->f_op->unlocked_ioctl) {
-               error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
-               if (error == -ENOIOCTLCMD)
-                       error = -EINVAL;
-               goto out;
-       } else if (filp->f_op->ioctl) {
-               lock_kernel();
-               error = filp->f_op->ioctl(filp->f_path.dentry->d_inode,
-                                         filp, cmd, arg);
-               unlock_kernel();
-       }
-
+       error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
+       if (error == -ENOIOCTLCMD)
+               error = -EINVAL;
  out:
        return error;
 }

diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 23561cd..9c2b5f4 100644 (file)
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -214,8 +214,7 @@ static long proc_reg_unlocked_ioctl(struct file *file, unsigned int cmd, unsigne
 {
        struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
        long rv = -ENOTTY;
-       long (*unlocked_ioctl)(struct file *, unsigned int, unsigned long);
-       int (*ioctl)(struct inode *, struct file *, unsigned int, unsigned long);
+       long (*ioctl)(struct file *, unsigned int, unsigned long);
 
        spin_lock(&pde->pde_unload_lock);
        if (!pde->proc_fops) {
@@ -223,19 +222,11 @@ static long proc_reg_unlocked_ioctl(struct file *file, unsigned int cmd, unsigne
                return rv;
        }
        pde->pde_users++;
-       unlocked_ioctl = pde->proc_fops->unlocked_ioctl;
-       ioctl = pde->proc_fops->ioctl;
+       ioctl = pde->proc_fops->unlocked_ioctl;
        spin_unlock(&pde->pde_unload_lock);
 
-       if (unlocked_ioctl) {
-               rv = unlocked_ioctl(file, cmd, arg);
-               if (rv == -ENOIOCTLCMD)
-                       rv = -EINVAL;
-       } else if (ioctl) {
-               WARN_ONCE(1, "Procfs ioctl handlers must use unlocked_ioctl, "
-                         "%pf will be called without the Bkl held\n", ioctl);
-               rv = ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
-       }
+       if (ioctl)
+               rv = ioctl(file, cmd, arg);
 
        pde_users_dec(pde);
        return rv;

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 7a0625e..3c786fd 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1483,8 +1483,8 @@ struct block_device_operations;
 
 /*
  * NOTE:
- * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
- * can be called without the big kernel lock held in all filesystems.
+ * all file operations except setlease can be called without
+ * the big kernel lock held in all filesystems.
  */
 struct file_operations {
        struct module *owner;
@@ -1495,7 +1495,6 @@ struct file_operations {
        ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
        int (*readdir) (struct file *, void *, filldir_t);
        unsigned int (*poll) (struct file *, struct poll_table_struct *);
-       int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
        long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
        long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
        int (*mmap) (struct file *, struct vm_area_struct *);