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 #include <linux/slab.h> 43 44 struct linux_file; 45 46 #undef file 47 48 extern struct fileops linuxfileops; 49 50 static inline struct linux_file * 51 linux_fget(unsigned int fd) 52 { 53 cap_rights_t rights; 54 struct file *file; 55 56 if (fget_unlocked(curthread->td_proc->p_fd, fd, 57 cap_rights_init(&rights), &file, NULL) != 0) { 58 return (NULL); 59 } 60 return (struct linux_file *)file->f_data; 61 } 62 63 static inline void 64 fput(struct linux_file *filp) 65 { 66 if (filp->_file == NULL) { 67 kfree(filp); 68 return; 69 } 70 if (refcount_release(&filp->_file->f_count)) { 71 _fdrop(filp->_file, curthread); 72 kfree(filp); 73 } 74 } 75 76 static inline void 77 put_unused_fd(unsigned int fd) 78 { 79 cap_rights_t rights; 80 struct file *file; 81 82 if (fget_unlocked(curthread->td_proc->p_fd, fd, 83 cap_rights_init(&rights), &file, NULL) != 0) { 84 return; 85 } 86 /* 87 * NOTE: We should only get here when the "fd" has not been 88 * installed, so no need to free the associated Linux file 89 * structure. 90 */ 91 fdclose(curthread, file, fd); 92 93 /* drop extra reference */ 94 fdrop(file, curthread); 95 } 96 97 static inline void 98 fd_install(unsigned int fd, struct linux_file *filp) 99 { 100 cap_rights_t rights; 101 struct file *file; 102 103 if (fget_unlocked(curthread->td_proc->p_fd, fd, 104 cap_rights_init(&rights), &file, NULL) != 0) { 105 filp->_file = NULL; 106 } else { 107 filp->_file = file; 108 finit(file, filp->f_mode, DTYPE_DEV, filp, &linuxfileops); 109 } 110 111 /* drop the extra reference */ 112 fput(filp); 113 } 114 115 static inline int 116 get_unused_fd(void) 117 { 118 struct file *file; 119 int error; 120 int fd; 121 122 error = falloc(curthread, &file, &fd, 0); 123 if (error) 124 return -error; 125 /* drop the extra reference */ 126 fdrop(file, curthread); 127 return fd; 128 } 129 130 static inline int 131 get_unused_fd_flags(int flags) 132 { 133 struct file *file; 134 int error; 135 int fd; 136 137 error = falloc(curthread, &file, &fd, flags); 138 if (error) 139 return -error; 140 /* drop the extra reference */ 141 fdrop(file, curthread); 142 return fd; 143 } 144 145 static inline struct linux_file * 146 alloc_file(int mode, const struct file_operations *fops) 147 { 148 struct linux_file *filp; 149 150 filp = kzalloc(sizeof(*filp), GFP_KERNEL); 151 if (filp == NULL) 152 return (NULL); 153 filp->f_op = fops; 154 filp->f_mode = mode; 155 156 return filp; 157 } 158 159 struct fd { 160 struct linux_file *linux_file; 161 }; 162 163 static inline void fdput(struct fd fd) 164 { 165 fput(fd.linux_file); 166 } 167 168 static inline struct fd fdget(unsigned int fd) 169 { 170 struct linux_file *f = linux_fget(fd); 171 return (struct fd){f}; 172 } 173 174 #define file linux_file 175 #define fget linux_fget 176 177 #endif /* _LINUX_FILE_H_ */ 178