1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2015 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 #ifndef _LINUX_FILE_H_ 32 #define _LINUX_FILE_H_ 33 34 #include <sys/param.h> 35 #include <sys/file.h> 36 #include <sys/filedesc.h> 37 #include <sys/refcount.h> 38 #include <sys/capsicum.h> 39 #include <sys/proc.h> 40 41 #include <linux/fs.h> 42 43 struct linux_file; 44 45 #undef file 46 47 extern struct fileops linuxfileops; 48 49 static inline struct linux_file * 50 linux_fget(unsigned int fd) 51 { 52 cap_rights_t rights; 53 struct file *file; 54 55 if (fget_unlocked(curthread->td_proc->p_fd, fd, 56 cap_rights_init(&rights), &file, NULL) != 0) { 57 return (NULL); 58 } 59 return (struct linux_file *)file->f_data; 60 } 61 62 static inline void 63 fput(struct linux_file *filp) 64 { 65 if (filp->_file == NULL) { 66 kfree(filp); 67 return; 68 } 69 if (refcount_release(&filp->_file->f_count)) { 70 _fdrop(filp->_file, curthread); 71 kfree(filp); 72 } 73 } 74 75 static inline void 76 put_unused_fd(unsigned int fd) 77 { 78 cap_rights_t rights; 79 struct file *file; 80 81 if (fget_unlocked(curthread->td_proc->p_fd, fd, 82 cap_rights_init(&rights), &file, NULL) != 0) { 83 return; 84 } 85 /* 86 * NOTE: We should only get here when the "fd" has not been 87 * installed, so no need to free the associated Linux file 88 * structure. 89 */ 90 fdclose(curthread, file, fd); 91 92 /* drop extra reference */ 93 fdrop(file, curthread); 94 } 95 96 static inline void 97 fd_install(unsigned int fd, struct linux_file *filp) 98 { 99 cap_rights_t rights; 100 struct file *file; 101 102 if (fget_unlocked(curthread->td_proc->p_fd, fd, 103 cap_rights_init(&rights), &file, NULL) != 0) { 104 filp->_file = NULL; 105 } else { 106 filp->_file = file; 107 finit(file, filp->f_mode, DTYPE_DEV, filp, &linuxfileops); 108 } 109 110 /* drop the extra reference */ 111 fput(filp); 112 } 113 114 static inline int 115 get_unused_fd(void) 116 { 117 struct file *file; 118 int error; 119 int fd; 120 121 error = falloc(curthread, &file, &fd, 0); 122 if (error) 123 return -error; 124 /* drop the extra reference */ 125 fdrop(file, curthread); 126 return fd; 127 } 128 129 static inline int 130 get_unused_fd_flags(int flags) 131 { 132 struct file *file; 133 int error; 134 int fd; 135 136 error = falloc(curthread, &file, &fd, flags); 137 if (error) 138 return -error; 139 /* drop the extra reference */ 140 fdrop(file, curthread); 141 return fd; 142 } 143 144 static inline struct linux_file * 145 alloc_file(int mode, const struct file_operations *fops) 146 { 147 struct linux_file *filp; 148 149 filp = kzalloc(sizeof(*filp), GFP_KERNEL); 150 if (filp == NULL) 151 return (NULL); 152 filp->f_op = fops; 153 filp->f_mode = mode; 154 155 return filp; 156 } 157 158 struct fd { 159 struct linux_file *linux_file; 160 }; 161 162 static inline void fdput(struct fd fd) 163 { 164 fput(fd.linux_file); 165 } 166 167 static inline struct fd fdget(unsigned int fd) 168 { 169 struct linux_file *f = linux_fget(fd); 170 return (struct fd){f}; 171 } 172 173 #define file linux_file 174 #define fget linux_fget 175 176 #endif /* _LINUX_FILE_H_ */ 177