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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/fcntl.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | #include <linux/syscalls.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/mm.h> | |
10 | #include <linux/fs.h> | |
11 | #include <linux/file.h> | |
12 | #include <linux/dnotify.h> | |
13 | #include <linux/smp_lock.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/security.h> | |
17 | #include <linux/ptrace.h> | |
7ed20e1a | 18 | #include <linux/signal.h> |
ab2af1f5 | 19 | #include <linux/rcupdate.h> |
1da177e4 LT |
20 | |
21 | #include <asm/poll.h> | |
22 | #include <asm/siginfo.h> | |
23 | #include <asm/uaccess.h> | |
24 | ||
25 | void fastcall set_close_on_exec(unsigned int fd, int flag) | |
26 | { | |
27 | struct files_struct *files = current->files; | |
badf1662 | 28 | struct fdtable *fdt; |
1da177e4 | 29 | spin_lock(&files->file_lock); |
badf1662 | 30 | fdt = files_fdtable(files); |
1da177e4 | 31 | if (flag) |
badf1662 | 32 | FD_SET(fd, fdt->close_on_exec); |
1da177e4 | 33 | else |
badf1662 | 34 | FD_CLR(fd, fdt->close_on_exec); |
1da177e4 LT |
35 | spin_unlock(&files->file_lock); |
36 | } | |
37 | ||
38 | static inline int get_close_on_exec(unsigned int fd) | |
39 | { | |
40 | struct files_struct *files = current->files; | |
badf1662 | 41 | struct fdtable *fdt; |
1da177e4 | 42 | int res; |
b835996f | 43 | rcu_read_lock(); |
badf1662 DS |
44 | fdt = files_fdtable(files); |
45 | res = FD_ISSET(fd, fdt->close_on_exec); | |
b835996f | 46 | rcu_read_unlock(); |
1da177e4 LT |
47 | return res; |
48 | } | |
49 | ||
50 | /* | |
51 | * locate_fd finds a free file descriptor in the open_fds fdset, | |
52 | * expanding the fd arrays if necessary. Must be called with the | |
53 | * file_lock held for write. | |
54 | */ | |
55 | ||
56 | static int locate_fd(struct files_struct *files, | |
57 | struct file *file, unsigned int orig_start) | |
58 | { | |
59 | unsigned int newfd; | |
60 | unsigned int start; | |
61 | int error; | |
badf1662 | 62 | struct fdtable *fdt; |
1da177e4 LT |
63 | |
64 | error = -EINVAL; | |
65 | if (orig_start >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur) | |
66 | goto out; | |
67 | ||
68 | repeat: | |
ab2af1f5 | 69 | fdt = files_fdtable(files); |
1da177e4 LT |
70 | /* |
71 | * Someone might have closed fd's in the range | |
badf1662 | 72 | * orig_start..fdt->next_fd |
1da177e4 LT |
73 | */ |
74 | start = orig_start; | |
badf1662 DS |
75 | if (start < fdt->next_fd) |
76 | start = fdt->next_fd; | |
1da177e4 LT |
77 | |
78 | newfd = start; | |
badf1662 DS |
79 | if (start < fdt->max_fdset) { |
80 | newfd = find_next_zero_bit(fdt->open_fds->fds_bits, | |
81 | fdt->max_fdset, start); | |
1da177e4 LT |
82 | } |
83 | ||
84 | error = -EMFILE; | |
85 | if (newfd >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur) | |
86 | goto out; | |
87 | ||
88 | error = expand_files(files, newfd); | |
89 | if (error < 0) | |
90 | goto out; | |
91 | ||
92 | /* | |
93 | * If we needed to expand the fs array we | |
94 | * might have blocked - try again. | |
95 | */ | |
96 | if (error) | |
97 | goto repeat; | |
98 | ||
ab2af1f5 DS |
99 | /* |
100 | * We reacquired files_lock, so we are safe as long as | |
101 | * we reacquire the fdtable pointer and use it while holding | |
102 | * the lock, no one can free it during that time. | |
103 | */ | |
104 | fdt = files_fdtable(files); | |
badf1662 DS |
105 | if (start <= fdt->next_fd) |
106 | fdt->next_fd = newfd + 1; | |
ab2af1f5 | 107 | |
1da177e4 LT |
108 | error = newfd; |
109 | ||
110 | out: | |
111 | return error; | |
112 | } | |
113 | ||
114 | static int dupfd(struct file *file, unsigned int start) | |
115 | { | |
116 | struct files_struct * files = current->files; | |
badf1662 | 117 | struct fdtable *fdt; |
1da177e4 LT |
118 | int fd; |
119 | ||
120 | spin_lock(&files->file_lock); | |
121 | fd = locate_fd(files, file, start); | |
122 | if (fd >= 0) { | |
badf1662 DS |
123 | /* locate_fd() may have expanded fdtable, load the ptr */ |
124 | fdt = files_fdtable(files); | |
125 | FD_SET(fd, fdt->open_fds); | |
126 | FD_CLR(fd, fdt->close_on_exec); | |
1da177e4 LT |
127 | spin_unlock(&files->file_lock); |
128 | fd_install(fd, file); | |
129 | } else { | |
130 | spin_unlock(&files->file_lock); | |
131 | fput(file); | |
132 | } | |
133 | ||
134 | return fd; | |
135 | } | |
136 | ||
137 | asmlinkage long sys_dup2(unsigned int oldfd, unsigned int newfd) | |
138 | { | |
139 | int err = -EBADF; | |
140 | struct file * file, *tofree; | |
141 | struct files_struct * files = current->files; | |
badf1662 | 142 | struct fdtable *fdt; |
1da177e4 LT |
143 | |
144 | spin_lock(&files->file_lock); | |
145 | if (!(file = fcheck(oldfd))) | |
146 | goto out_unlock; | |
147 | err = newfd; | |
148 | if (newfd == oldfd) | |
149 | goto out_unlock; | |
150 | err = -EBADF; | |
151 | if (newfd >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur) | |
152 | goto out_unlock; | |
153 | get_file(file); /* We are now finished with oldfd */ | |
154 | ||
155 | err = expand_files(files, newfd); | |
156 | if (err < 0) | |
157 | goto out_fput; | |
158 | ||
159 | /* To avoid races with open() and dup(), we will mark the fd as | |
160 | * in-use in the open-file bitmap throughout the entire dup2() | |
161 | * process. This is quite safe: do_close() uses the fd array | |
162 | * entry, not the bitmap, to decide what work needs to be | |
163 | * done. --sct */ | |
164 | /* Doesn't work. open() might be there first. --AV */ | |
165 | ||
166 | /* Yes. It's a race. In user space. Nothing sane to do */ | |
167 | err = -EBUSY; | |
badf1662 DS |
168 | fdt = files_fdtable(files); |
169 | tofree = fdt->fd[newfd]; | |
170 | if (!tofree && FD_ISSET(newfd, fdt->open_fds)) | |
1da177e4 LT |
171 | goto out_fput; |
172 | ||
ab2af1f5 | 173 | rcu_assign_pointer(fdt->fd[newfd], file); |
badf1662 DS |
174 | FD_SET(newfd, fdt->open_fds); |
175 | FD_CLR(newfd, fdt->close_on_exec); | |
1da177e4 LT |
176 | spin_unlock(&files->file_lock); |
177 | ||
178 | if (tofree) | |
179 | filp_close(tofree, files); | |
180 | err = newfd; | |
181 | out: | |
182 | return err; | |
183 | out_unlock: | |
184 | spin_unlock(&files->file_lock); | |
185 | goto out; | |
186 | ||
187 | out_fput: | |
188 | spin_unlock(&files->file_lock); | |
189 | fput(file); | |
190 | goto out; | |
191 | } | |
192 | ||
193 | asmlinkage long sys_dup(unsigned int fildes) | |
194 | { | |
195 | int ret = -EBADF; | |
196 | struct file * file = fget(fildes); | |
197 | ||
198 | if (file) | |
199 | ret = dupfd(file, 0); | |
200 | return ret; | |
201 | } | |
202 | ||
203 | #define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | FASYNC | O_DIRECT | O_NOATIME) | |
204 | ||
205 | static int setfl(int fd, struct file * filp, unsigned long arg) | |
206 | { | |
207 | struct inode * inode = filp->f_dentry->d_inode; | |
208 | int error = 0; | |
209 | ||
210 | /* O_APPEND cannot be cleared if the file is marked as append-only */ | |
211 | if (!(arg & O_APPEND) && IS_APPEND(inode)) | |
212 | return -EPERM; | |
213 | ||
214 | /* O_NOATIME can only be set by the owner or superuser */ | |
215 | if ((arg & O_NOATIME) && !(filp->f_flags & O_NOATIME)) | |
216 | if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER)) | |
217 | return -EPERM; | |
218 | ||
219 | /* required for strict SunOS emulation */ | |
220 | if (O_NONBLOCK != O_NDELAY) | |
221 | if (arg & O_NDELAY) | |
222 | arg |= O_NONBLOCK; | |
223 | ||
224 | if (arg & O_DIRECT) { | |
225 | if (!filp->f_mapping || !filp->f_mapping->a_ops || | |
226 | !filp->f_mapping->a_ops->direct_IO) | |
227 | return -EINVAL; | |
228 | } | |
229 | ||
230 | if (filp->f_op && filp->f_op->check_flags) | |
231 | error = filp->f_op->check_flags(arg); | |
232 | if (error) | |
233 | return error; | |
234 | ||
235 | lock_kernel(); | |
236 | if ((arg ^ filp->f_flags) & FASYNC) { | |
237 | if (filp->f_op && filp->f_op->fasync) { | |
238 | error = filp->f_op->fasync(fd, filp, (arg & FASYNC) != 0); | |
239 | if (error < 0) | |
240 | goto out; | |
241 | } | |
242 | } | |
243 | ||
244 | filp->f_flags = (arg & SETFL_MASK) | (filp->f_flags & ~SETFL_MASK); | |
245 | out: | |
246 | unlock_kernel(); | |
247 | return error; | |
248 | } | |
249 | ||
250 | static void f_modown(struct file *filp, unsigned long pid, | |
251 | uid_t uid, uid_t euid, int force) | |
252 | { | |
253 | write_lock_irq(&filp->f_owner.lock); | |
254 | if (force || !filp->f_owner.pid) { | |
255 | filp->f_owner.pid = pid; | |
256 | filp->f_owner.uid = uid; | |
257 | filp->f_owner.euid = euid; | |
258 | } | |
259 | write_unlock_irq(&filp->f_owner.lock); | |
260 | } | |
261 | ||
262 | int f_setown(struct file *filp, unsigned long arg, int force) | |
263 | { | |
264 | int err; | |
265 | ||
266 | err = security_file_set_fowner(filp); | |
267 | if (err) | |
268 | return err; | |
269 | ||
270 | f_modown(filp, arg, current->uid, current->euid, force); | |
271 | return 0; | |
272 | } | |
273 | ||
274 | EXPORT_SYMBOL(f_setown); | |
275 | ||
276 | void f_delown(struct file *filp) | |
277 | { | |
278 | f_modown(filp, 0, 0, 0, 1); | |
279 | } | |
280 | ||
281 | static long do_fcntl(int fd, unsigned int cmd, unsigned long arg, | |
282 | struct file *filp) | |
283 | { | |
284 | long err = -EINVAL; | |
285 | ||
286 | switch (cmd) { | |
287 | case F_DUPFD: | |
288 | get_file(filp); | |
289 | err = dupfd(filp, arg); | |
290 | break; | |
291 | case F_GETFD: | |
292 | err = get_close_on_exec(fd) ? FD_CLOEXEC : 0; | |
293 | break; | |
294 | case F_SETFD: | |
295 | err = 0; | |
296 | set_close_on_exec(fd, arg & FD_CLOEXEC); | |
297 | break; | |
298 | case F_GETFL: | |
299 | err = filp->f_flags; | |
300 | break; | |
301 | case F_SETFL: | |
302 | err = setfl(fd, filp, arg); | |
303 | break; | |
304 | case F_GETLK: | |
305 | err = fcntl_getlk(filp, (struct flock __user *) arg); | |
306 | break; | |
307 | case F_SETLK: | |
308 | case F_SETLKW: | |
c293621b | 309 | err = fcntl_setlk(fd, filp, cmd, (struct flock __user *) arg); |
1da177e4 LT |
310 | break; |
311 | case F_GETOWN: | |
312 | /* | |
313 | * XXX If f_owner is a process group, the | |
314 | * negative return value will get converted | |
315 | * into an error. Oops. If we keep the | |
316 | * current syscall conventions, the only way | |
317 | * to fix this will be in libc. | |
318 | */ | |
319 | err = filp->f_owner.pid; | |
320 | force_successful_syscall_return(); | |
321 | break; | |
322 | case F_SETOWN: | |
323 | err = f_setown(filp, arg, 1); | |
324 | break; | |
325 | case F_GETSIG: | |
326 | err = filp->f_owner.signum; | |
327 | break; | |
328 | case F_SETSIG: | |
329 | /* arg == 0 restores default behaviour. */ | |
7ed20e1a | 330 | if (!valid_signal(arg)) { |
1da177e4 LT |
331 | break; |
332 | } | |
333 | err = 0; | |
334 | filp->f_owner.signum = arg; | |
335 | break; | |
336 | case F_GETLEASE: | |
337 | err = fcntl_getlease(filp); | |
338 | break; | |
339 | case F_SETLEASE: | |
340 | err = fcntl_setlease(fd, filp, arg); | |
341 | break; | |
342 | case F_NOTIFY: | |
343 | err = fcntl_dirnotify(fd, filp, arg); | |
344 | break; | |
345 | default: | |
346 | break; | |
347 | } | |
348 | return err; | |
349 | } | |
350 | ||
351 | asmlinkage long sys_fcntl(unsigned int fd, unsigned int cmd, unsigned long arg) | |
352 | { | |
353 | struct file *filp; | |
354 | long err = -EBADF; | |
355 | ||
356 | filp = fget(fd); | |
357 | if (!filp) | |
358 | goto out; | |
359 | ||
360 | err = security_file_fcntl(filp, cmd, arg); | |
361 | if (err) { | |
362 | fput(filp); | |
363 | return err; | |
364 | } | |
365 | ||
366 | err = do_fcntl(fd, cmd, arg, filp); | |
367 | ||
368 | fput(filp); | |
369 | out: | |
370 | return err; | |
371 | } | |
372 | ||
373 | #if BITS_PER_LONG == 32 | |
374 | asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) | |
375 | { | |
376 | struct file * filp; | |
377 | long err; | |
378 | ||
379 | err = -EBADF; | |
380 | filp = fget(fd); | |
381 | if (!filp) | |
382 | goto out; | |
383 | ||
384 | err = security_file_fcntl(filp, cmd, arg); | |
385 | if (err) { | |
386 | fput(filp); | |
387 | return err; | |
388 | } | |
389 | err = -EBADF; | |
390 | ||
391 | switch (cmd) { | |
392 | case F_GETLK64: | |
393 | err = fcntl_getlk64(filp, (struct flock64 __user *) arg); | |
394 | break; | |
395 | case F_SETLK64: | |
396 | case F_SETLKW64: | |
c293621b PS |
397 | err = fcntl_setlk64(fd, filp, cmd, |
398 | (struct flock64 __user *) arg); | |
1da177e4 LT |
399 | break; |
400 | default: | |
401 | err = do_fcntl(fd, cmd, arg, filp); | |
402 | break; | |
403 | } | |
404 | fput(filp); | |
405 | out: | |
406 | return err; | |
407 | } | |
408 | #endif | |
409 | ||
410 | /* Table to convert sigio signal codes into poll band bitmaps */ | |
411 | ||
412 | static long band_table[NSIGPOLL] = { | |
413 | POLLIN | POLLRDNORM, /* POLL_IN */ | |
414 | POLLOUT | POLLWRNORM | POLLWRBAND, /* POLL_OUT */ | |
415 | POLLIN | POLLRDNORM | POLLMSG, /* POLL_MSG */ | |
416 | POLLERR, /* POLL_ERR */ | |
417 | POLLPRI | POLLRDBAND, /* POLL_PRI */ | |
418 | POLLHUP | POLLERR /* POLL_HUP */ | |
419 | }; | |
420 | ||
421 | static inline int sigio_perm(struct task_struct *p, | |
422 | struct fown_struct *fown, int sig) | |
423 | { | |
424 | return (((fown->euid == 0) || | |
425 | (fown->euid == p->suid) || (fown->euid == p->uid) || | |
426 | (fown->uid == p->suid) || (fown->uid == p->uid)) && | |
427 | !security_file_send_sigiotask(p, fown, sig)); | |
428 | } | |
429 | ||
430 | static void send_sigio_to_task(struct task_struct *p, | |
431 | struct fown_struct *fown, | |
432 | int fd, | |
433 | int reason) | |
434 | { | |
435 | if (!sigio_perm(p, fown, fown->signum)) | |
436 | return; | |
437 | ||
438 | switch (fown->signum) { | |
439 | siginfo_t si; | |
440 | default: | |
441 | /* Queue a rt signal with the appropriate fd as its | |
442 | value. We use SI_SIGIO as the source, not | |
443 | SI_KERNEL, since kernel signals always get | |
444 | delivered even if we can't queue. Failure to | |
445 | queue in this case _should_ be reported; we fall | |
446 | back to SIGIO in that case. --sct */ | |
447 | si.si_signo = fown->signum; | |
448 | si.si_errno = 0; | |
449 | si.si_code = reason; | |
450 | /* Make sure we are called with one of the POLL_* | |
451 | reasons, otherwise we could leak kernel stack into | |
452 | userspace. */ | |
453 | if ((reason & __SI_MASK) != __SI_POLL) | |
454 | BUG(); | |
455 | if (reason - POLL_IN >= NSIGPOLL) | |
456 | si.si_band = ~0L; | |
457 | else | |
458 | si.si_band = band_table[reason - POLL_IN]; | |
459 | si.si_fd = fd; | |
fc9c9ab2 | 460 | if (!send_group_sig_info(fown->signum, &si, p)) |
1da177e4 LT |
461 | break; |
462 | /* fall-through: fall back on the old plain SIGIO signal */ | |
463 | case 0: | |
464 | send_group_sig_info(SIGIO, SEND_SIG_PRIV, p); | |
465 | } | |
466 | } | |
467 | ||
468 | void send_sigio(struct fown_struct *fown, int fd, int band) | |
469 | { | |
470 | struct task_struct *p; | |
471 | int pid; | |
472 | ||
473 | read_lock(&fown->lock); | |
474 | pid = fown->pid; | |
475 | if (!pid) | |
476 | goto out_unlock_fown; | |
477 | ||
478 | read_lock(&tasklist_lock); | |
479 | if (pid > 0) { | |
480 | p = find_task_by_pid(pid); | |
481 | if (p) { | |
482 | send_sigio_to_task(p, fown, fd, band); | |
483 | } | |
484 | } else { | |
485 | do_each_task_pid(-pid, PIDTYPE_PGID, p) { | |
486 | send_sigio_to_task(p, fown, fd, band); | |
487 | } while_each_task_pid(-pid, PIDTYPE_PGID, p); | |
488 | } | |
489 | read_unlock(&tasklist_lock); | |
490 | out_unlock_fown: | |
491 | read_unlock(&fown->lock); | |
492 | } | |
493 | ||
494 | static void send_sigurg_to_task(struct task_struct *p, | |
495 | struct fown_struct *fown) | |
496 | { | |
497 | if (sigio_perm(p, fown, SIGURG)) | |
498 | send_group_sig_info(SIGURG, SEND_SIG_PRIV, p); | |
499 | } | |
500 | ||
501 | int send_sigurg(struct fown_struct *fown) | |
502 | { | |
503 | struct task_struct *p; | |
504 | int pid, ret = 0; | |
505 | ||
506 | read_lock(&fown->lock); | |
507 | pid = fown->pid; | |
508 | if (!pid) | |
509 | goto out_unlock_fown; | |
510 | ||
511 | ret = 1; | |
512 | ||
513 | read_lock(&tasklist_lock); | |
514 | if (pid > 0) { | |
515 | p = find_task_by_pid(pid); | |
516 | if (p) { | |
517 | send_sigurg_to_task(p, fown); | |
518 | } | |
519 | } else { | |
520 | do_each_task_pid(-pid, PIDTYPE_PGID, p) { | |
521 | send_sigurg_to_task(p, fown); | |
522 | } while_each_task_pid(-pid, PIDTYPE_PGID, p); | |
523 | } | |
524 | read_unlock(&tasklist_lock); | |
525 | out_unlock_fown: | |
526 | read_unlock(&fown->lock); | |
527 | return ret; | |
528 | } | |
529 | ||
530 | static DEFINE_RWLOCK(fasync_lock); | |
531 | static kmem_cache_t *fasync_cache; | |
532 | ||
533 | /* | |
534 | * fasync_helper() is used by some character device drivers (mainly mice) | |
535 | * to set up the fasync queue. It returns negative on error, 0 if it did | |
536 | * no changes and positive if it added/deleted the entry. | |
537 | */ | |
538 | int fasync_helper(int fd, struct file * filp, int on, struct fasync_struct **fapp) | |
539 | { | |
540 | struct fasync_struct *fa, **fp; | |
541 | struct fasync_struct *new = NULL; | |
542 | int result = 0; | |
543 | ||
544 | if (on) { | |
545 | new = kmem_cache_alloc(fasync_cache, SLAB_KERNEL); | |
546 | if (!new) | |
547 | return -ENOMEM; | |
548 | } | |
549 | write_lock_irq(&fasync_lock); | |
550 | for (fp = fapp; (fa = *fp) != NULL; fp = &fa->fa_next) { | |
551 | if (fa->fa_file == filp) { | |
552 | if(on) { | |
553 | fa->fa_fd = fd; | |
554 | kmem_cache_free(fasync_cache, new); | |
555 | } else { | |
556 | *fp = fa->fa_next; | |
557 | kmem_cache_free(fasync_cache, fa); | |
558 | result = 1; | |
559 | } | |
560 | goto out; | |
561 | } | |
562 | } | |
563 | ||
564 | if (on) { | |
565 | new->magic = FASYNC_MAGIC; | |
566 | new->fa_file = filp; | |
567 | new->fa_fd = fd; | |
568 | new->fa_next = *fapp; | |
569 | *fapp = new; | |
570 | result = 1; | |
571 | } | |
572 | out: | |
573 | write_unlock_irq(&fasync_lock); | |
574 | return result; | |
575 | } | |
576 | ||
577 | EXPORT_SYMBOL(fasync_helper); | |
578 | ||
579 | void __kill_fasync(struct fasync_struct *fa, int sig, int band) | |
580 | { | |
581 | while (fa) { | |
582 | struct fown_struct * fown; | |
583 | if (fa->magic != FASYNC_MAGIC) { | |
584 | printk(KERN_ERR "kill_fasync: bad magic number in " | |
585 | "fasync_struct!\n"); | |
586 | return; | |
587 | } | |
588 | fown = &fa->fa_file->f_owner; | |
589 | /* Don't send SIGURG to processes which have not set a | |
590 | queued signum: SIGURG has its own default signalling | |
591 | mechanism. */ | |
592 | if (!(sig == SIGURG && fown->signum == 0)) | |
593 | send_sigio(fown, fa->fa_fd, band); | |
594 | fa = fa->fa_next; | |
595 | } | |
596 | } | |
597 | ||
598 | EXPORT_SYMBOL(__kill_fasync); | |
599 | ||
600 | void kill_fasync(struct fasync_struct **fp, int sig, int band) | |
601 | { | |
602 | /* First a quick test without locking: usually | |
603 | * the list is empty. | |
604 | */ | |
605 | if (*fp) { | |
606 | read_lock(&fasync_lock); | |
607 | /* reread *fp after obtaining the lock */ | |
608 | __kill_fasync(*fp, sig, band); | |
609 | read_unlock(&fasync_lock); | |
610 | } | |
611 | } | |
612 | EXPORT_SYMBOL(kill_fasync); | |
613 | ||
614 | static int __init fasync_init(void) | |
615 | { | |
616 | fasync_cache = kmem_cache_create("fasync_cache", | |
617 | sizeof(struct fasync_struct), 0, SLAB_PANIC, NULL, NULL); | |
618 | return 0; | |
619 | } | |
620 | ||
621 | module_init(fasync_init) |