#include <linux/fs.h>
#include <linux/security.h>
#include <linux/module.h>
+#include <linux/uaccess.h>
-#include <asm/uaccess.h>
#include <asm/ioctls.h>
-static long do_ioctl(struct file *filp, unsigned int cmd,
- unsigned long arg)
+/**
+ * vfs_ioctl - call filesystem specific ioctl methods
+ * @filp: open file to invoke ioctl method on
+ * @cmd: ioctl command to execute
+ * @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.
+ */
+long vfs_ioctl(struct file *filp, unsigned int cmd,
+ unsigned long arg)
{
int error = -ENOTTY;
return error;
}
+static int ioctl_fibmap(struct file *filp, int __user *p)
+{
+ struct address_space *mapping = filp->f_mapping;
+ int res, block;
+
+ /* do we support this mess? */
+ if (!mapping->a_ops->bmap)
+ return -EINVAL;
+ if (!capable(CAP_SYS_RAWIO))
+ return -EPERM;
+ res = get_user(block, p);
+ if (res)
+ return res;
+ lock_kernel();
+ res = mapping->a_ops->bmap(mapping, block);
+ unlock_kernel();
+ return put_user(res, p);
+}
+
static int file_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
- int error;
- int block;
- struct inode * inode = filp->f_path.dentry->d_inode;
+ struct inode *inode = filp->f_path.dentry->d_inode;
int __user *p = (int __user *)arg;
switch (cmd) {
- case FIBMAP:
- {
- struct address_space *mapping = filp->f_mapping;
- int res;
- /* do we support this mess? */
- if (!mapping->a_ops->bmap)
- return -EINVAL;
- if (!capable(CAP_SYS_RAWIO))
- return -EPERM;
- if ((error = get_user(block, p)) != 0)
- return error;
+ case FIBMAP:
+ return ioctl_fibmap(filp, p);
+ case FIGETBSZ:
+ return put_user(inode->i_sb->s_blocksize, p);
+ case FIONREAD:
+ return put_user(i_size_read(inode) - filp->f_pos, p);
+ }
+ return vfs_ioctl(filp, cmd, arg);
+}
+
+static int ioctl_fionbio(struct file *filp, int __user *argp)
+{
+ unsigned int flag;
+ int on, error;
+
+ error = get_user(on, argp);
+ if (error)
+ return error;
+ flag = O_NONBLOCK;
+#ifdef __sparc__
+ /* SunOS compatibility item. */
+ if (O_NONBLOCK != O_NDELAY)
+ flag |= O_NDELAY;
+#endif
+ if (on)
+ filp->f_flags |= flag;
+ else
+ filp->f_flags &= ~flag;
+ return error;
+}
+
+static int ioctl_fioasync(unsigned int fd, struct file *filp,
+ int __user *argp)
+{
+ unsigned int flag;
+ int on, error;
+
+ error = get_user(on, argp);
+ if (error)
+ return error;
+ flag = on ? FASYNC : 0;
+
+ /* Did FASYNC state change ? */
+ if ((flag ^ filp->f_flags) & FASYNC) {
+ if (filp->f_op && filp->f_op->fasync) {
lock_kernel();
- res = mapping->a_ops->bmap(mapping, block);
+ error = filp->f_op->fasync(fd, filp, on);
unlock_kernel();
- return put_user(res, p);
- }
- case FIGETBSZ:
- return put_user(inode->i_sb->s_blocksize, p);
- case FIONREAD:
- return put_user(i_size_read(inode) - filp->f_pos, p);
+ } else
+ error = -ENOTTY;
}
+ if (error)
+ return error;
- return do_ioctl(filp, cmd, arg);
+ if (on)
+ filp->f_flags |= FASYNC;
+ else
+ filp->f_flags &= ~FASYNC;
+ return error;
}
/*
* When you add any new common ioctls to the switches above and below
* please update compat_sys_ioctl() too.
*
- * vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
+ * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
* It's just a simple helper for sys_ioctl and compat_sys_ioctl.
*/
-int vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, unsigned long arg)
+int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
+ unsigned long arg)
{
- unsigned int flag;
- int on, error = 0;
+ int error = 0;
+ int __user *argp = (int __user *)arg;
switch (cmd) {
- case FIOCLEX:
- set_close_on_exec(fd, 1);
- break;
-
- case FIONCLEX:
- set_close_on_exec(fd, 0);
- break;
-
- case FIONBIO:
- if ((error = get_user(on, (int __user *)arg)) != 0)
- break;
- flag = O_NONBLOCK;
-#ifdef __sparc__
- /* SunOS compatibility item. */
- if(O_NONBLOCK != O_NDELAY)
- flag |= O_NDELAY;
-#endif
- if (on)
- filp->f_flags |= flag;
- else
- filp->f_flags &= ~flag;
- break;
-
- case FIOASYNC:
- if ((error = get_user(on, (int __user *)arg)) != 0)
- break;
- flag = on ? FASYNC : 0;
-
- /* Did FASYNC state change ? */
- if ((flag ^ filp->f_flags) & FASYNC) {
- if (filp->f_op && filp->f_op->fasync) {
- lock_kernel();
- error = filp->f_op->fasync(fd, filp, on);
- unlock_kernel();
- }
- else error = -ENOTTY;
- }
- if (error != 0)
- break;
-
- if (on)
- filp->f_flags |= FASYNC;
- else
- filp->f_flags &= ~FASYNC;
- break;
-
- case FIOQSIZE:
- if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) ||
- S_ISREG(filp->f_path.dentry->d_inode->i_mode) ||
- S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {
- loff_t res = inode_get_bytes(filp->f_path.dentry->d_inode);
- error = copy_to_user((loff_t __user *)arg, &res, sizeof(res)) ? -EFAULT : 0;
- }
- else
- error = -ENOTTY;
- break;
- default:
- if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
- error = file_ioctl(filp, cmd, arg);
- else
- error = do_ioctl(filp, cmd, arg);
- break;
+ case FIOCLEX:
+ set_close_on_exec(fd, 1);
+ break;
+
+ case FIONCLEX:
+ set_close_on_exec(fd, 0);
+ break;
+
+ case FIONBIO:
+ error = ioctl_fionbio(filp, argp);
+ break;
+
+ case FIOASYNC:
+ error = ioctl_fioasync(fd, filp, argp);
+ break;
+
+ case FIOQSIZE:
+ if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) ||
+ S_ISREG(filp->f_path.dentry->d_inode->i_mode) ||
+ S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {
+ loff_t res =
+ inode_get_bytes(filp->f_path.dentry->d_inode);
+ error = copy_to_user((loff_t __user *)arg, &res,
+ sizeof(res)) ? -EFAULT : 0;
+ } else
+ error = -ENOTTY;
+ break;
+ default:
+ if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
+ error = file_ioctl(filp, cmd, arg);
+ else
+ error = vfs_ioctl(filp, cmd, arg);
+ break;
}
return error;
}
asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
{
- struct file * filp;
+ struct file *filp;
int error = -EBADF;
int fput_needed;
if (error)
goto out_fput;
- error = vfs_ioctl(filp, fd, cmd, arg);
+ error = do_vfs_ioctl(filp, fd, cmd, arg);
out_fput:
fput_light(filp, fput_needed);
out:
return error;
}
-
-/*
- * Platforms implementing 32 bit compatibility ioctl handlers in
- * modules need this exported
- */
-#ifdef CONFIG_COMPAT
-EXPORT_SYMBOL(sys_ioctl);
-#endif
git.samba.org / sfrench / cifs-2.6.git / blobdiff