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/*-
* Copyright (c) 2010 Isilon Systems, Inc.
* Copyright (c) 2010 iX Systems, Inc.
* Copyright (c) 2010 Panasas, Inc.
* Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _LINUX_FILE_H_
#define _LINUX_FILE_H_
#include <sys/param.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/refcount.h>
#include <sys/proc.h>
#include <linux/fs.h>
struct linux_file;
#undef file
extern struct fileops linuxfileops;
static inline struct linux_file *
linux_fget(unsigned int fd)
{
struct file *file;
if (fget_unlocked(curthread->td_proc->p_fd, fd, NULL, 0, &file,
NULL) != 0) {
return (NULL);
}
return (struct linux_file *)file->f_data;
}
static inline void
fput(struct linux_file *filp)
{
if (filp->_file == NULL) {
kfree(filp);
return;
}
if (refcount_release(&filp->_file->f_count)) {
_fdrop(filp->_file, curthread);
kfree(filp);
}
}
static inline void
put_unused_fd(unsigned int fd)
{
struct file *file;
if (fget_unlocked(curthread->td_proc->p_fd, fd, NULL, 0, &file,
NULL) != 0) {
return;
}
/*
* NOTE: We should only get here when the "fd" has not been
* installed, so no need to free the associated Linux file
* structure.
*/
fdclose(curthread->td_proc->p_fd, file, fd, curthread);
/* drop extra reference */
fdrop(file, curthread);
}
static inline void
fd_install(unsigned int fd, struct linux_file *filp)
{
struct file *file;
if (fget_unlocked(curthread->td_proc->p_fd, fd, NULL, 0, &file,
NULL) != 0) {
filp->_file = NULL;
} else {
filp->_file = file;
finit(file, filp->f_mode, DTYPE_DEV, filp, &linuxfileops);
}
/* drop the extra reference */
fput(filp);
}
static inline int
get_unused_fd(void)
{
struct file *file;
int error;
int fd;
error = falloc(curthread, &file, &fd, 0);
if (error)
return -error;
/* drop the extra reference */
fdrop(file, curthread);
return fd;
}
static inline int
get_unused_fd_flags(int flags)
{
struct file *file;
int error;
int fd;
error = falloc(curthread, &file, &fd, flags);
if (error)
return -error;
/* drop the extra reference */
fdrop(file, curthread);
return fd;
}
static inline struct linux_file *
alloc_file(int mode, const struct file_operations *fops)
{
struct linux_file *filp;
filp = kzalloc(sizeof(*filp), GFP_KERNEL);
if (filp == NULL)
return (NULL);
filp->f_op = fops;
filp->f_mode = mode;
return filp;
}
struct fd {
struct linux_file *linux_file;
};
static inline void fdput(struct fd fd)
{
fput(fd.linux_file);
}
static inline struct fd fdget(unsigned int fd)
{
struct linux_file *f = linux_fget(fd);
return (struct fd){f};
}
#define file linux_file
#define fget linux_fget
#endif /* _LINUX_FILE_H_ */
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