diff options
Diffstat (limited to 'lib/librte_vhost/eventfd_link/eventfd_link.c')
| -rw-r--r-- | lib/librte_vhost/eventfd_link/eventfd_link.c | 277 |
1 files changed, 0 insertions, 277 deletions
diff --git a/lib/librte_vhost/eventfd_link/eventfd_link.c b/lib/librte_vhost/eventfd_link/eventfd_link.c deleted file mode 100644 index 4b05b5a8..00000000 --- a/lib/librte_vhost/eventfd_link/eventfd_link.c +++ /dev/null @@ -1,277 +0,0 @@ -/*- - * GPL LICENSE SUMMARY - * - * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of version 2 of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. - * The full GNU General Public License is included in this distribution - * in the file called LICENSE.GPL. - * - * Contact Information: - * Intel Corporation - */ - -#include <linux/miscdevice.h> -#include <linux/module.h> -#include <linux/file.h> -#include <linux/fdtable.h> -#include <linux/syscalls.h> - -#include "eventfd_link.h" - - -/* - * get_files_struct is copied from fs/file.c - */ -struct files_struct * -get_files_struct(struct task_struct *task) -{ - struct files_struct *files; - - task_lock(task); - files = task->files; - if (files) - atomic_inc(&files->count); - task_unlock(task); - - return files; -} - -/* - * put_files_struct is extracted from fs/file.c - */ -void -put_files_struct(struct files_struct *files) -{ - if (atomic_dec_and_test(&files->count)) - BUG(); -} - -static struct file * -fget_from_files(struct files_struct *files, unsigned fd) -{ - struct file *file; - - rcu_read_lock(); - file = fcheck_files(files, fd); - if (file) { - if (file->f_mode & FMODE_PATH || - !atomic_long_inc_not_zero(&file->f_count)) { - - file = NULL; - } - } - rcu_read_unlock(); - - return file; -} - -static long -eventfd_link_ioctl_copy2(unsigned long arg) -{ - void __user *argp = (void __user *) arg; - struct task_struct *task_target = NULL; - struct file *file; - struct files_struct *files; - struct eventfd_copy2 eventfd_copy2; - long ret = -EFAULT; - - if (copy_from_user(&eventfd_copy2, argp, sizeof(struct eventfd_copy2))) - goto out; - - /* - * Find the task struct for the target pid - */ - ret = -ESRCH; - - task_target = - get_pid_task(find_vpid(eventfd_copy2.pid), PIDTYPE_PID); - if (task_target == NULL) { - pr_info("Unable to find pid %d\n", eventfd_copy2.pid); - goto out; - } - - ret = -ESTALE; - files = get_files_struct(task_target); - if (files == NULL) { - pr_info("Failed to get target files struct\n"); - goto out_task; - } - - ret = -EBADF; - file = fget_from_files(files, eventfd_copy2.fd); - put_files_struct(files); - - if (file == NULL) { - pr_info("Failed to get fd %d from target\n", eventfd_copy2.fd); - goto out_task; - } - - /* - * Install the file struct from the target process into the - * newly allocated file desciptor of the source process. - */ - ret = get_unused_fd_flags(eventfd_copy2.flags); - if (ret < 0) { - fput(file); - goto out_task; - } - fd_install(ret, file); - -out_task: - put_task_struct(task_target); -out: - return ret; -} - -static long -eventfd_link_ioctl_copy(unsigned long arg) -{ - void __user *argp = (void __user *) arg; - struct task_struct *task_target = NULL; - struct file *file; - struct files_struct *files; - struct fdtable *fdt; - struct eventfd_copy eventfd_copy; - long ret = -EFAULT; - - if (copy_from_user(&eventfd_copy, argp, sizeof(struct eventfd_copy))) - goto out; - - /* - * Find the task struct for the target pid - */ - ret = -ESRCH; - - task_target = - get_pid_task(find_vpid(eventfd_copy.target_pid), PIDTYPE_PID); - if (task_target == NULL) { - pr_info("Unable to find pid %d\n", eventfd_copy.target_pid); - goto out; - } - - ret = -ESTALE; - files = get_files_struct(current); - if (files == NULL) { - pr_info("Failed to get current files struct\n"); - goto out_task; - } - - ret = -EBADF; - file = fget_from_files(files, eventfd_copy.source_fd); - - if (file == NULL) { - pr_info("Failed to get fd %d from source\n", - eventfd_copy.source_fd); - put_files_struct(files); - goto out_task; - } - - /* - * Release the existing eventfd in the source process - */ - spin_lock(&files->file_lock); - fput(file); - filp_close(file, files); - fdt = files_fdtable(files); - fdt->fd[eventfd_copy.source_fd] = NULL; - spin_unlock(&files->file_lock); - - put_files_struct(files); - - /* - * Find the file struct associated with the target fd. - */ - - ret = -ESTALE; - files = get_files_struct(task_target); - if (files == NULL) { - pr_info("Failed to get target files struct\n"); - goto out_task; - } - - ret = -EBADF; - file = fget_from_files(files, eventfd_copy.target_fd); - put_files_struct(files); - - if (file == NULL) { - pr_info("Failed to get fd %d from target\n", - eventfd_copy.target_fd); - goto out_task; - } - - /* - * Install the file struct from the target process into the - * file desciptor of the source process, - */ - - fd_install(eventfd_copy.source_fd, file); - ret = 0; - -out_task: - put_task_struct(task_target); -out: - return ret; -} - -static long -eventfd_link_ioctl(struct file *f, unsigned int ioctl, unsigned long arg) -{ - long ret = -ENOIOCTLCMD; - - switch (ioctl) { - case EVENTFD_COPY: - ret = eventfd_link_ioctl_copy(arg); - break; - case EVENTFD_COPY2: - ret = eventfd_link_ioctl_copy2(arg); - break; - } - - return ret; -} - -static const struct file_operations eventfd_link_fops = { - .owner = THIS_MODULE, - .unlocked_ioctl = eventfd_link_ioctl, -}; - - -static struct miscdevice eventfd_link_misc = { - .minor = MISC_DYNAMIC_MINOR, - .name = "eventfd-link", - .fops = &eventfd_link_fops, -}; - -static int __init -eventfd_link_init(void) -{ - return misc_register(&eventfd_link_misc); -} - -module_init(eventfd_link_init); - -static void __exit -eventfd_link_exit(void) -{ - misc_deregister(&eventfd_link_misc); -} - -module_exit(eventfd_link_exit); - -MODULE_VERSION("0.0.1"); -MODULE_LICENSE("GPL v2"); -MODULE_AUTHOR("Anthony Fee"); -MODULE_DESCRIPTION("Link eventfd"); -MODULE_ALIAS("devname:eventfd-link"); |