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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/ioctl.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/ioctl.c')
-rw-r--r--fs/ioctl.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/fs/ioctl.c b/fs/ioctl.c
new file mode 100644
index 00000000000..56920918142
--- /dev/null
+++ b/fs/ioctl.c
@@ -0,0 +1,186 @@
+/*
+ * linux/fs/ioctl.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ */
+
+#include <linux/config.h>
+#include <linux/syscalls.h>
+#include <linux/mm.h>
+#include <linux/smp_lock.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/security.h>
+#include <linux/module.h>
+
+#include <asm/uaccess.h>
+#include <asm/ioctls.h>
+
+static long do_ioctl(struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ int error = -ENOTTY;
+
+ if (!filp->f_op)
+ 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_dentry->d_inode,
+ filp, cmd, arg);
+ unlock_kernel();
+ }
+
+ out:
+ return error;
+}
+
+static int file_ioctl(struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ int error;
+ int block;
+ struct inode * inode = filp->f_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;
+
+ lock_kernel();
+ res = mapping->a_ops->bmap(mapping, block);
+ unlock_kernel();
+ return put_user(res, p);
+ }
+ case FIGETBSZ:
+ if (inode->i_sb == NULL)
+ return -EBADF;
+ return put_user(inode->i_sb->s_blocksize, p);
+ case FIONREAD:
+ return put_user(i_size_read(inode) - filp->f_pos, p);
+ }
+
+ return do_ioctl(filp, cmd, arg);
+}
+
+/*
+ * 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.
+ * 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)
+{
+ unsigned int flag;
+ int on, error = 0;
+
+ 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_dentry->d_inode->i_mode) ||
+ S_ISREG(filp->f_dentry->d_inode->i_mode) ||
+ S_ISLNK(filp->f_dentry->d_inode->i_mode)) {
+ loff_t res = inode_get_bytes(filp->f_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_dentry->d_inode->i_mode))
+ error = file_ioctl(filp, cmd, arg);
+ else
+ error = do_ioctl(filp, cmd, arg);
+ break;
+ }
+ return error;
+}
+
+asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
+{
+ struct file * filp;
+ int error = -EBADF;
+ int fput_needed;
+
+ filp = fget_light(fd, &fput_needed);
+ if (!filp)
+ goto out;
+
+ error = security_file_ioctl(filp, cmd, arg);
+ if (error)
+ goto out_fput;
+
+ error = 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