1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)file.h 8.3 (Berkeley) 1/9/95 32 * $FreeBSD$ 33 */ 34 35 #ifndef _SYS_FILE_H_ 36 #define _SYS_FILE_H_ 37 38 #ifndef _KERNEL 39 #include <sys/types.h> /* XXX */ 40 #include <sys/fcntl.h> 41 #include <sys/unistd.h> 42 #else 43 #include <sys/queue.h> 44 #include <sys/refcount.h> 45 #include <sys/_lock.h> 46 #include <sys/_mutex.h> 47 #include <vm/vm.h> 48 49 struct filedesc; 50 struct stat; 51 struct thread; 52 struct uio; 53 struct knote; 54 struct vnode; 55 56 #endif /* _KERNEL */ 57 58 #define DTYPE_NONE 0 /* not yet initialized */ 59 #define DTYPE_VNODE 1 /* file */ 60 #define DTYPE_SOCKET 2 /* communications endpoint */ 61 #define DTYPE_PIPE 3 /* pipe */ 62 #define DTYPE_FIFO 4 /* fifo (named pipe) */ 63 #define DTYPE_KQUEUE 5 /* event queue */ 64 #define DTYPE_CRYPTO 6 /* crypto */ 65 #define DTYPE_MQUEUE 7 /* posix message queue */ 66 #define DTYPE_SHM 8 /* swap-backed shared memory */ 67 #define DTYPE_SEM 9 /* posix semaphore */ 68 #define DTYPE_PTS 10 /* pseudo teletype master device */ 69 #define DTYPE_DEV 11 /* Device specific fd type */ 70 #define DTYPE_PROCDESC 12 /* process descriptor */ 71 #define DTYPE_LINUXEFD 13 /* emulation eventfd type */ 72 #define DTYPE_LINUXTFD 14 /* emulation timerfd type */ 73 74 #ifdef _KERNEL 75 76 struct file; 77 struct filecaps; 78 struct kaiocb; 79 struct kinfo_file; 80 struct ucred; 81 82 #define FOF_OFFSET 0x01 /* Use the offset in uio argument */ 83 #define FOF_NOLOCK 0x02 /* Do not take FOFFSET_LOCK */ 84 #define FOF_NEXTOFF 0x04 /* Also update f_nextoff */ 85 #define FOF_NOUPDATE 0x10 /* Do not update f_offset */ 86 off_t foffset_lock(struct file *fp, int flags); 87 void foffset_lock_uio(struct file *fp, struct uio *uio, int flags); 88 void foffset_unlock(struct file *fp, off_t val, int flags); 89 void foffset_unlock_uio(struct file *fp, struct uio *uio, int flags); 90 91 static inline off_t 92 foffset_get(struct file *fp) 93 { 94 95 return (foffset_lock(fp, FOF_NOLOCK)); 96 } 97 98 typedef int fo_rdwr_t(struct file *fp, struct uio *uio, 99 struct ucred *active_cred, int flags, 100 struct thread *td); 101 typedef int fo_truncate_t(struct file *fp, off_t length, 102 struct ucred *active_cred, struct thread *td); 103 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data, 104 struct ucred *active_cred, struct thread *td); 105 typedef int fo_poll_t(struct file *fp, int events, 106 struct ucred *active_cred, struct thread *td); 107 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn); 108 typedef int fo_stat_t(struct file *fp, struct stat *sb, 109 struct ucred *active_cred, struct thread *td); 110 typedef int fo_close_t(struct file *fp, struct thread *td); 111 typedef int fo_chmod_t(struct file *fp, mode_t mode, 112 struct ucred *active_cred, struct thread *td); 113 typedef int fo_chown_t(struct file *fp, uid_t uid, gid_t gid, 114 struct ucred *active_cred, struct thread *td); 115 typedef int fo_sendfile_t(struct file *fp, int sockfd, struct uio *hdr_uio, 116 struct uio *trl_uio, off_t offset, size_t nbytes, 117 off_t *sent, int flags, struct thread *td); 118 typedef int fo_seek_t(struct file *fp, off_t offset, int whence, 119 struct thread *td); 120 typedef int fo_fill_kinfo_t(struct file *fp, struct kinfo_file *kif, 121 struct filedesc *fdp); 122 typedef int fo_mmap_t(struct file *fp, vm_map_t map, vm_offset_t *addr, 123 vm_size_t size, vm_prot_t prot, vm_prot_t cap_maxprot, 124 int flags, vm_ooffset_t foff, struct thread *td); 125 typedef int fo_aio_queue_t(struct file *fp, struct kaiocb *job); 126 typedef int fo_flags_t; 127 128 struct fileops { 129 fo_rdwr_t *fo_read; 130 fo_rdwr_t *fo_write; 131 fo_truncate_t *fo_truncate; 132 fo_ioctl_t *fo_ioctl; 133 fo_poll_t *fo_poll; 134 fo_kqfilter_t *fo_kqfilter; 135 fo_stat_t *fo_stat; 136 fo_close_t *fo_close; 137 fo_chmod_t *fo_chmod; 138 fo_chown_t *fo_chown; 139 fo_sendfile_t *fo_sendfile; 140 fo_seek_t *fo_seek; 141 fo_fill_kinfo_t *fo_fill_kinfo; 142 fo_mmap_t *fo_mmap; 143 fo_aio_queue_t *fo_aio_queue; 144 fo_flags_t fo_flags; /* DFLAG_* below */ 145 }; 146 147 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */ 148 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */ 149 #endif /* _KERNEL */ 150 151 #if defined(_KERNEL) || defined(_WANT_FILE) 152 /* 153 * Kernel descriptor table. 154 * One entry for each open kernel vnode and socket. 155 * 156 * Below is the list of locks that protects members in struct file. 157 * 158 * (a) f_vnode lock required (shared allows both reads and writes) 159 * (f) protected with mtx_lock(mtx_pool_find(fp)) 160 * (d) cdevpriv_mtx 161 * none not locked 162 */ 163 164 struct fadvise_info { 165 int fa_advice; /* (f) FADV_* type. */ 166 off_t fa_start; /* (f) Region start. */ 167 off_t fa_end; /* (f) Region end. */ 168 }; 169 170 struct file { 171 void *f_data; /* file descriptor specific data */ 172 struct fileops *f_ops; /* File operations */ 173 struct ucred *f_cred; /* associated credentials. */ 174 struct vnode *f_vnode; /* NULL or applicable vnode */ 175 short f_type; /* descriptor type */ 176 short f_vnread_flags; /* (f) Sleep lock for f_offset */ 177 volatile u_int f_flag; /* see fcntl.h */ 178 volatile u_int f_count; /* reference count */ 179 /* 180 * DTYPE_VNODE specific fields. 181 */ 182 int f_seqcount; /* (a) Count of sequential accesses. */ 183 off_t f_nextoff; /* next expected read/write offset. */ 184 union { 185 struct cdev_privdata *fvn_cdevpriv; 186 /* (d) Private data for the cdev. */ 187 struct fadvise_info *fvn_advice; 188 } f_vnun; 189 /* 190 * DFLAG_SEEKABLE specific fields 191 */ 192 off_t f_offset; 193 /* 194 * Mandatory Access control information. 195 */ 196 void *f_label; /* Place-holder for MAC label. */ 197 }; 198 199 #define f_cdevpriv f_vnun.fvn_cdevpriv 200 #define f_advice f_vnun.fvn_advice 201 202 #define FOFFSET_LOCKED 0x1 203 #define FOFFSET_LOCK_WAITING 0x2 204 #define FDEVFS_VNODE 0x4 205 206 #endif /* _KERNEL || _WANT_FILE */ 207 208 /* 209 * Userland version of struct file, for sysctl 210 */ 211 struct xfile { 212 ksize_t xf_size; /* size of struct xfile */ 213 pid_t xf_pid; /* owning process */ 214 uid_t xf_uid; /* effective uid of owning process */ 215 int xf_fd; /* descriptor number */ 216 int _xf_int_pad1; 217 kvaddr_t xf_file; /* address of struct file */ 218 short xf_type; /* descriptor type */ 219 short _xf_short_pad1; 220 int xf_count; /* reference count */ 221 int xf_msgcount; /* references from message queue */ 222 int _xf_int_pad2; 223 off_t xf_offset; /* file offset */ 224 kvaddr_t xf_data; /* file descriptor specific data */ 225 kvaddr_t xf_vnode; /* vnode pointer */ 226 u_int xf_flag; /* flags (see fcntl.h) */ 227 int _xf_int_pad3; 228 int64_t _xf_int64_pad[6]; 229 }; 230 231 #ifdef _KERNEL 232 233 extern struct fileops vnops; 234 extern struct fileops badfileops; 235 extern struct fileops socketops; 236 extern int maxfiles; /* kernel limit on number of open files */ 237 extern int maxfilesperproc; /* per process limit on number of open files */ 238 extern volatile int openfiles; /* actual number of open files */ 239 240 int fget(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp); 241 int fget_mmap(struct thread *td, int fd, cap_rights_t *rightsp, 242 u_char *maxprotp, struct file **fpp); 243 int fget_read(struct thread *td, int fd, cap_rights_t *rightsp, 244 struct file **fpp); 245 int fget_write(struct thread *td, int fd, cap_rights_t *rightsp, 246 struct file **fpp); 247 int fget_fcntl(struct thread *td, int fd, cap_rights_t *rightsp, 248 int needfcntl, struct file **fpp); 249 int _fdrop(struct file *fp, struct thread *td); 250 251 fo_rdwr_t invfo_rdwr; 252 fo_truncate_t invfo_truncate; 253 fo_ioctl_t invfo_ioctl; 254 fo_poll_t invfo_poll; 255 fo_kqfilter_t invfo_kqfilter; 256 fo_chmod_t invfo_chmod; 257 fo_chown_t invfo_chown; 258 fo_sendfile_t invfo_sendfile; 259 260 fo_sendfile_t vn_sendfile; 261 fo_seek_t vn_seek; 262 fo_fill_kinfo_t vn_fill_kinfo; 263 int vn_fill_kinfo_vnode(struct vnode *vp, struct kinfo_file *kif); 264 265 void finit(struct file *, u_int, short, void *, struct fileops *); 266 int fgetvp(struct thread *td, int fd, cap_rights_t *rightsp, 267 struct vnode **vpp); 268 int fgetvp_exec(struct thread *td, int fd, cap_rights_t *rightsp, 269 struct vnode **vpp); 270 int fgetvp_rights(struct thread *td, int fd, cap_rights_t *needrightsp, 271 struct filecaps *havecaps, struct vnode **vpp); 272 int fgetvp_read(struct thread *td, int fd, cap_rights_t *rightsp, 273 struct vnode **vpp); 274 int fgetvp_write(struct thread *td, int fd, cap_rights_t *rightsp, 275 struct vnode **vpp); 276 277 static __inline int 278 _fnoop(void) 279 { 280 281 return (0); 282 } 283 284 #define fhold(fp) \ 285 (refcount_acquire(&(fp)->f_count)) 286 #define fdrop(fp, td) \ 287 (refcount_release(&(fp)->f_count) ? _fdrop((fp), (td)) : _fnoop()) 288 289 static __inline fo_rdwr_t fo_read; 290 static __inline fo_rdwr_t fo_write; 291 static __inline fo_truncate_t fo_truncate; 292 static __inline fo_ioctl_t fo_ioctl; 293 static __inline fo_poll_t fo_poll; 294 static __inline fo_kqfilter_t fo_kqfilter; 295 static __inline fo_stat_t fo_stat; 296 static __inline fo_close_t fo_close; 297 static __inline fo_chmod_t fo_chmod; 298 static __inline fo_chown_t fo_chown; 299 static __inline fo_sendfile_t fo_sendfile; 300 301 static __inline int 302 fo_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 303 int flags, struct thread *td) 304 { 305 306 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td)); 307 } 308 309 static __inline int 310 fo_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 311 int flags, struct thread *td) 312 { 313 314 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td)); 315 } 316 317 static __inline int 318 fo_truncate(struct file *fp, off_t length, struct ucred *active_cred, 319 struct thread *td) 320 { 321 322 return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td)); 323 } 324 325 static __inline int 326 fo_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred, 327 struct thread *td) 328 { 329 330 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td)); 331 } 332 333 static __inline int 334 fo_poll(struct file *fp, int events, struct ucred *active_cred, 335 struct thread *td) 336 { 337 338 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td)); 339 } 340 341 static __inline int 342 fo_stat(struct file *fp, struct stat *sb, struct ucred *active_cred, 343 struct thread *td) 344 { 345 346 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td)); 347 } 348 349 static __inline int 350 fo_close(struct file *fp, struct thread *td) 351 { 352 353 return ((*fp->f_ops->fo_close)(fp, td)); 354 } 355 356 static __inline int 357 fo_kqfilter(struct file *fp, struct knote *kn) 358 { 359 360 return ((*fp->f_ops->fo_kqfilter)(fp, kn)); 361 } 362 363 static __inline int 364 fo_chmod(struct file *fp, mode_t mode, struct ucred *active_cred, 365 struct thread *td) 366 { 367 368 return ((*fp->f_ops->fo_chmod)(fp, mode, active_cred, td)); 369 } 370 371 static __inline int 372 fo_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, 373 struct thread *td) 374 { 375 376 return ((*fp->f_ops->fo_chown)(fp, uid, gid, active_cred, td)); 377 } 378 379 static __inline int 380 fo_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio, 381 struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags, 382 struct thread *td) 383 { 384 385 return ((*fp->f_ops->fo_sendfile)(fp, sockfd, hdr_uio, trl_uio, offset, 386 nbytes, sent, flags, td)); 387 } 388 389 static __inline int 390 fo_seek(struct file *fp, off_t offset, int whence, struct thread *td) 391 { 392 393 return ((*fp->f_ops->fo_seek)(fp, offset, whence, td)); 394 } 395 396 static __inline int 397 fo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 398 { 399 400 return ((*fp->f_ops->fo_fill_kinfo)(fp, kif, fdp)); 401 } 402 403 static __inline int 404 fo_mmap(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size, 405 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff, 406 struct thread *td) 407 { 408 409 if (fp->f_ops->fo_mmap == NULL) 410 return (ENODEV); 411 return ((*fp->f_ops->fo_mmap)(fp, map, addr, size, prot, cap_maxprot, 412 flags, foff, td)); 413 } 414 415 static __inline int 416 fo_aio_queue(struct file *fp, struct kaiocb *job) 417 { 418 419 return ((*fp->f_ops->fo_aio_queue)(fp, job)); 420 } 421 422 #endif /* _KERNEL */ 423 424 #endif /* !SYS_FILE_H */ 425