1e3db1de0c
A set of helper functions have been added to manage the life of the LinuxKPI task struct. When an external system call or task is invoked, a check is made to create the task struct by demand. A thread destructor callback is registered to free the task struct when a thread exits to avoid memory leaks. This change lays the ground for emulating the Linux kernel more closely which is a dependency by the code using the LinuxKPI APIs. Add new dedicated td_lkpi_task field has been added to struct thread instead of abusing td_retval[1]. Fix some header file inclusions to make LINT kernel build properly after this change. Bump the __FreeBSD_version to force a rebuild of all kernel modules. MFC after: 1 week Sponsored by: Mellanox Technologies
178 lines
4.0 KiB
C
178 lines
4.0 KiB
C
/*-
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* Copyright (c) 2010 Isilon Systems, Inc.
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* Copyright (c) 2010 iX Systems, Inc.
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* Copyright (c) 2010 Panasas, Inc.
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* Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUX_FILE_H_
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#define _LINUX_FILE_H_
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/refcount.h>
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#include <sys/capsicum.h>
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#include <sys/proc.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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struct linux_file;
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#undef file
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extern struct fileops linuxfileops;
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static inline struct linux_file *
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linux_fget(unsigned int fd)
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{
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cap_rights_t rights;
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struct file *file;
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if (fget_unlocked(curthread->td_proc->p_fd, fd,
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cap_rights_init(&rights), &file, NULL) != 0) {
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return (NULL);
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}
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return (struct linux_file *)file->f_data;
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}
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static inline void
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fput(struct linux_file *filp)
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{
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if (filp->_file == NULL) {
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kfree(filp);
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return;
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}
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if (refcount_release(&filp->_file->f_count)) {
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_fdrop(filp->_file, curthread);
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kfree(filp);
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}
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}
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static inline void
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put_unused_fd(unsigned int fd)
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{
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cap_rights_t rights;
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struct file *file;
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if (fget_unlocked(curthread->td_proc->p_fd, fd,
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cap_rights_init(&rights), &file, NULL) != 0) {
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return;
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}
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/*
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* NOTE: We should only get here when the "fd" has not been
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* installed, so no need to free the associated Linux file
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* structure.
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*/
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fdclose(curthread, file, fd);
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/* drop extra reference */
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fdrop(file, curthread);
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}
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static inline void
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fd_install(unsigned int fd, struct linux_file *filp)
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{
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cap_rights_t rights;
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struct file *file;
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if (fget_unlocked(curthread->td_proc->p_fd, fd,
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cap_rights_init(&rights), &file, NULL) != 0) {
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filp->_file = NULL;
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} else {
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filp->_file = file;
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finit(file, filp->f_mode, DTYPE_DEV, filp, &linuxfileops);
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}
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/* drop the extra reference */
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fput(filp);
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}
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static inline int
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get_unused_fd(void)
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{
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struct file *file;
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int error;
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int fd;
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error = falloc(curthread, &file, &fd, 0);
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if (error)
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return -error;
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/* drop the extra reference */
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fdrop(file, curthread);
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return fd;
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}
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static inline int
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get_unused_fd_flags(int flags)
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{
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struct file *file;
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int error;
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int fd;
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error = falloc(curthread, &file, &fd, flags);
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if (error)
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return -error;
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/* drop the extra reference */
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fdrop(file, curthread);
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return fd;
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}
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static inline struct linux_file *
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alloc_file(int mode, const struct file_operations *fops)
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{
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struct linux_file *filp;
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filp = kzalloc(sizeof(*filp), GFP_KERNEL);
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if (filp == NULL)
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return (NULL);
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filp->f_op = fops;
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filp->f_mode = mode;
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return filp;
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}
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struct fd {
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struct linux_file *linux_file;
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};
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static inline void fdput(struct fd fd)
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{
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fput(fd.linux_file);
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}
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static inline struct fd fdget(unsigned int fd)
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{
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struct linux_file *f = linux_fget(fd);
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return (struct fd){f};
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}
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#define file linux_file
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#define fget linux_fget
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#endif /* _LINUX_FILE_H_ */
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