file.h revision 293151
1219820Sjeff/*- 2219820Sjeff * Copyright (c) 2010 Isilon Systems, Inc. 3219820Sjeff * Copyright (c) 2010 iX Systems, Inc. 4219820Sjeff * Copyright (c) 2010 Panasas, Inc. 5293151Shselasky * Copyright (c) 2013-2015 Mellanox Technologies, Ltd. 6219820Sjeff * All rights reserved. 7219820Sjeff * 8219820Sjeff * Redistribution and use in source and binary forms, with or without 9219820Sjeff * modification, are permitted provided that the following conditions 10219820Sjeff * are met: 11219820Sjeff * 1. Redistributions of source code must retain the above copyright 12219820Sjeff * notice unmodified, this list of conditions, and the following 13219820Sjeff * disclaimer. 14219820Sjeff * 2. Redistributions in binary form must reproduce the above copyright 15219820Sjeff * notice, this list of conditions and the following disclaimer in the 16219820Sjeff * documentation and/or other materials provided with the distribution. 17219820Sjeff * 18219820Sjeff * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19219820Sjeff * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20219820Sjeff * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21219820Sjeff * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22219820Sjeff * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23219820Sjeff * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24219820Sjeff * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25219820Sjeff * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26219820Sjeff * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27219820Sjeff * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28219820Sjeff */ 29219820Sjeff#ifndef _LINUX_FILE_H_ 30219820Sjeff#define _LINUX_FILE_H_ 31219820Sjeff 32219820Sjeff#include <sys/param.h> 33219820Sjeff#include <sys/file.h> 34219820Sjeff#include <sys/filedesc.h> 35219820Sjeff#include <sys/refcount.h> 36219820Sjeff#include <sys/proc.h> 37219820Sjeff 38219820Sjeff#include <linux/fs.h> 39219820Sjeff 40219820Sjeffstruct linux_file; 41219820Sjeff 42219820Sjeff#undef file 43219820Sjeff 44219820Sjeffextern struct fileops linuxfileops; 45219820Sjeff 46219820Sjeffstatic inline struct linux_file * 47219820Sjefflinux_fget(unsigned int fd) 48219820Sjeff{ 49219820Sjeff struct file *file; 50219820Sjeff 51255240Spjd if (fget_unlocked(curthread->td_proc->p_fd, fd, NULL, 0, &file, 52255240Spjd NULL) != 0) { 53247602Spjd return (NULL); 54255240Spjd } 55219820Sjeff return (struct linux_file *)file->f_data; 56219820Sjeff} 57219820Sjeff 58219820Sjeffstatic inline void 59219820Sjefffput(struct linux_file *filp) 60219820Sjeff{ 61219820Sjeff if (filp->_file == NULL) { 62219820Sjeff kfree(filp); 63219820Sjeff return; 64219820Sjeff } 65219820Sjeff if (refcount_release(&filp->_file->f_count)) { 66219820Sjeff _fdrop(filp->_file, curthread); 67219820Sjeff kfree(filp); 68219820Sjeff } 69219820Sjeff} 70219820Sjeff 71219820Sjeffstatic inline void 72219820Sjeffput_unused_fd(unsigned int fd) 73219820Sjeff{ 74219820Sjeff struct file *file; 75219820Sjeff 76255240Spjd if (fget_unlocked(curthread->td_proc->p_fd, fd, NULL, 0, &file, 77255240Spjd NULL) != 0) { 78219820Sjeff return; 79255240Spjd } 80277139Shselasky /* 81277139Shselasky * NOTE: We should only get here when the "fd" has not been 82277139Shselasky * installed, so no need to free the associated Linux file 83277139Shselasky * structure. 84277139Shselasky */ 85219820Sjeff fdclose(curthread->td_proc->p_fd, file, fd, curthread); 86277139Shselasky 87277139Shselasky /* drop extra reference */ 88277139Shselasky fdrop(file, curthread); 89219820Sjeff} 90219820Sjeff 91219820Sjeffstatic inline void 92219820Sjefffd_install(unsigned int fd, struct linux_file *filp) 93219820Sjeff{ 94219820Sjeff struct file *file; 95219820Sjeff 96255240Spjd if (fget_unlocked(curthread->td_proc->p_fd, fd, NULL, 0, &file, 97255240Spjd NULL) != 0) { 98247602Spjd file = NULL; 99255240Spjd } 100219820Sjeff filp->_file = file; 101277139Shselasky finit(file, filp->f_mode, DTYPE_DEV, filp, &linuxfileops); 102277139Shselasky 103277139Shselasky /* drop the extra reference */ 104277139Shselasky fput(filp); 105219820Sjeff} 106219820Sjeff 107219820Sjeffstatic inline int 108219820Sjeffget_unused_fd(void) 109219820Sjeff{ 110219820Sjeff struct file *file; 111219820Sjeff int error; 112219820Sjeff int fd; 113219820Sjeff 114221055Sjeff error = falloc(curthread, &file, &fd, 0); 115219820Sjeff if (error) 116219820Sjeff return -error; 117277139Shselasky /* drop the extra reference */ 118277139Shselasky fdrop(file, curthread); 119219820Sjeff return fd; 120219820Sjeff} 121219820Sjeff 122293151Shselaskystatic inline int 123293151Shselaskyget_unused_fd_flags(int flags) 124293151Shselasky{ 125293151Shselasky struct file *file; 126293151Shselasky int error; 127293151Shselasky int fd; 128293151Shselasky 129293151Shselasky error = falloc(curthread, &file, &fd, flags); 130293151Shselasky if (error) 131293151Shselasky return -error; 132293151Shselasky /* drop the extra reference */ 133293151Shselasky fdrop(file, curthread); 134293151Shselasky return fd; 135293151Shselasky} 136293151Shselasky 137219820Sjeffstatic inline struct linux_file * 138271127Shselaskyalloc_file(int mode, const struct file_operations *fops) 139219820Sjeff{ 140219820Sjeff struct linux_file *filp; 141219820Sjeff 142219820Sjeff filp = kzalloc(sizeof(*filp), GFP_KERNEL); 143271127Shselasky if (filp == NULL) 144219820Sjeff return (NULL); 145219820Sjeff filp->f_op = fops; 146219820Sjeff filp->f_mode = mode; 147219820Sjeff 148219820Sjeff return filp; 149219820Sjeff} 150219820Sjeff 151271127Shselaskystruct fd { 152271127Shselasky struct linux_file *linux_file; 153271127Shselasky}; 154219820Sjeff 155271127Shselaskystatic inline void fdput(struct fd fd) 156271127Shselasky{ 157271127Shselasky fput(fd.linux_file); 158271127Shselasky} 159271127Shselasky 160271127Shselaskystatic inline struct fd fdget(unsigned int fd) 161271127Shselasky{ 162271127Shselasky struct linux_file *f = linux_fget(fd); 163271127Shselasky return (struct fd){f}; 164271127Shselasky} 165271127Shselasky 166219820Sjeff#define file linux_file 167219820Sjeff#define fget linux_fget 168219820Sjeff 169219820Sjeff#endif /* _LINUX_FILE_H_ */ 170