LU-5844 get rid of IOC_LIBCFS_MEMHOG and IOC_LIBCFS_PANIC ioctls

[fs/lustre-release.git] / libcfs / libcfs / linux / linux-module.c

diff --git a/libcfs/libcfs/linux/linux-module.c b/libcfs/libcfs/linux/linux-module.c
index 0008125..377f24f 100644 (file)
--- a/libcfs/libcfs/linux/linux-module.c
+++ b/libcfs/libcfs/linux/linux-module.c
@@ -27,7 +27,7 @@
  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2012, Intel Corporation.
+ * Copyright (c) 2012, 2014, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
@@ -42,8 +42,10 @@
 
 int libcfs_ioctl_data_adjust(struct libcfs_ioctl_data *data)
 {
+       ENTRY;
+
        if (libcfs_ioctl_is_invalid(data)) {
-               CERROR("LNET: ioctl not correctly formatted\n");
+               CERROR("libcfs ioctl: parameter not correctly formatted\n");
                RETURN(-EINVAL);
        }
 
@@ -52,127 +54,94 @@ int libcfs_ioctl_data_adjust(struct libcfs_ioctl_data *data)
 
        if (data->ioc_inllen2 != 0)
                data->ioc_inlbuf2 = &data->ioc_bulk[0] +
-                       cfs_size_round(data->ioc_inllen1);
+                                   cfs_size_round(data->ioc_inllen1);
 
        RETURN(0);
 }
 
-int libcfs_ioctl_getdata_len(const struct libcfs_ioctl_hdr __user *arg,
-                            __u32 *len)
+int libcfs_ioctl_getdata(struct libcfs_ioctl_hdr **hdr_pp,
+                        struct libcfs_ioctl_hdr __user *uhdr)
 {
-       struct libcfs_ioctl_hdr hdr;
+       struct libcfs_ioctl_hdr   hdr;
+       int err = 0;
        ENTRY;
 
-       if (copy_from_user(&hdr, arg, sizeof(hdr)))
+       if (copy_from_user(&hdr, uhdr, sizeof(hdr)))
                RETURN(-EFAULT);
 
-       if (hdr.ioc_version != LIBCFS_IOCTL_VERSION) {
-               CERROR("LNET: version mismatch expected %#x, got %#x\n",
+       if (hdr.ioc_version != LIBCFS_IOCTL_VERSION &&
+           hdr.ioc_version != LIBCFS_IOCTL_VERSION2) {
+               CERROR("libcfs ioctl: version mismatch expected %#x, got %#x\n",
                       LIBCFS_IOCTL_VERSION, hdr.ioc_version);
                RETURN(-EINVAL);
        }
 
-       *len = hdr.ioc_len;
+       if (hdr.ioc_len < sizeof(struct libcfs_ioctl_hdr)) {
+               CERROR("libcfs ioctl: user buffer too small for ioctl\n");
+               RETURN(-EINVAL);
+       }
 
-       RETURN(0);
-}
+       if (hdr.ioc_len > LIBCFS_IOC_DATA_MAX) {
+               CERROR("libcfs ioctl: user buffer is too large %d/%d\n",
+                      hdr.ioc_len, LIBCFS_IOC_DATA_MAX);
+               RETURN(-EINVAL);
+       }
 
-int libcfs_ioctl_getdata(struct libcfs_ioctl_hdr *buf, __u32 buf_len,
-                        const void __user *arg)
-{
-       ENTRY;
+       LIBCFS_ALLOC(*hdr_pp, hdr.ioc_len);
+       if (*hdr_pp == NULL)
+               RETURN(-ENOMEM);
 
-       if (copy_from_user(buf, arg, buf_len))
-               RETURN(-EINVAL);
+       if (copy_from_user(*hdr_pp, uhdr, hdr.ioc_len))
+               GOTO(failed, err = -EFAULT);
 
        RETURN(0);
+failed:
+       LIBCFS_FREE(*hdr_pp, hdr.ioc_len);
+       RETURN(err);
 }
 
-int libcfs_ioctl_popdata(void *arg, void *data, int size)
-{
-       if (copy_to_user((char *)arg, data, size))
-               return -EFAULT;
-       return 0;
-}
-
-extern struct cfs_psdev_ops          libcfs_psdev_ops;
-
 static int
 libcfs_psdev_open(struct inode * inode, struct file * file)
 {
-       struct libcfs_device_userstate **pdu = NULL;
-       int    rc = 0;
-
        if (!inode)
-               return (-EINVAL);
-       pdu = (struct libcfs_device_userstate **)&file->private_data;
-       if (libcfs_psdev_ops.p_open != NULL)
-               rc = libcfs_psdev_ops.p_open(0, (void *)pdu);
-       else
-               return (-EPERM);
-       return rc;
+               return -EINVAL;
+
+       try_module_get(THIS_MODULE);
+       return 0;
 }
 
 /* called when closing /dev/device */
 static int
 libcfs_psdev_release(struct inode * inode, struct file * file)
 {
-       struct libcfs_device_userstate *pdu;
-       int    rc = 0;
-
        if (!inode)
-               return (-EINVAL);
-       pdu = file->private_data;
-       if (libcfs_psdev_ops.p_close != NULL)
-               rc = libcfs_psdev_ops.p_close(0, (void *)pdu);
-       else
-               rc = -EPERM;
-       return rc;
+               return -EINVAL;
+
+       module_put(THIS_MODULE);
+       return 0;
 }
 
-static long libcfs_ioctl(struct file *file,
-                        unsigned int cmd, unsigned long arg)
+static long
+libcfs_psdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
-       struct cfs_psdev_file    pfile;
-       int    rc = 0;
-
        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;
 
-       if ( _IOC_TYPE(cmd) != IOC_LIBCFS_TYPE ||
-            _IOC_NR(cmd) < IOC_LIBCFS_MIN_NR  ||
-            _IOC_NR(cmd) > IOC_LIBCFS_MAX_NR ) {
+       if (_IOC_TYPE(cmd) != IOC_LIBCFS_TYPE ||
+           _IOC_NR(cmd) < IOC_LIBCFS_MIN_NR ||
+           _IOC_NR(cmd) > IOC_LIBCFS_MAX_NR) {
                CDEBUG(D_IOCTL, "invalid ioctl ( type %d, nr %d, size %d )\n",
                       _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
-               return (-EINVAL);
-       }
-
-       /* Handle platform-dependent IOC requests */
-       switch (cmd) {
-       case IOC_LIBCFS_PANIC:
-               if (!cfs_capable(CFS_CAP_SYS_BOOT))
-                       return (-EPERM);
-               panic("debugctl-invoked panic");
-               return (0);
-       case IOC_LIBCFS_MEMHOG:
-               if (!cfs_capable(CFS_CAP_SYS_ADMIN))
-                       return -EPERM;
-               /* go thought */
+               return -EINVAL;
        }
 
-       pfile.off = 0;
-       pfile.private_data = file->private_data;
-       if (libcfs_psdev_ops.p_ioctl != NULL)
-               rc = libcfs_psdev_ops.p_ioctl(&pfile, cmd, (void *)arg);
-       else
-               rc = -EPERM;
-       return (rc);
+       return libcfs_ioctl(cmd, (void __user *)arg);
 }
 
 static struct file_operations libcfs_fops = {
-       unlocked_ioctl: libcfs_ioctl,
-       open :          libcfs_psdev_open,
-       release :       libcfs_psdev_release
+       .unlocked_ioctl = libcfs_psdev_ioctl,
+       .open           = libcfs_psdev_open,
+       .release        = libcfs_psdev_release
 };
 
 struct miscdevice libcfs_dev = {