1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 1991, 1992 Linus Torvalds
8 #include <linux/syscalls.h>
9 #include <linux/init.h>
11 #include <linux/sched/task.h>
13 #include <linux/file.h>
14 #include <linux/fdtable.h>
15 #include <linux/capability.h>
16 #include <linux/dnotify.h>
17 #include <linux/slab.h>
18 #include <linux/module.h>
19 #include <linux/pipe_fs_i.h>
20 #include <linux/security.h>
21 #include <linux/ptrace.h>
22 #include <linux/signal.h>
23 #include <linux/rcupdate.h>
24 #include <linux/pid_namespace.h>
25 #include <linux/user_namespace.h>
26 #include <linux/shmem_fs.h>
27 #include <linux/compat.h>
30 #include <asm/siginfo.h>
31 #include <linux/uaccess.h>
33 #define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME)
35 static int setfl(int fd
, struct file
* filp
, unsigned long arg
)
37 struct inode
* inode
= file_inode(filp
);
41 * O_APPEND cannot be cleared if the file is marked as append-only
42 * and the file is open for write.
44 if (((arg
^ filp
->f_flags
) & O_APPEND
) && IS_APPEND(inode
))
47 /* O_NOATIME can only be set by the owner or superuser */
48 if ((arg
& O_NOATIME
) && !(filp
->f_flags
& O_NOATIME
))
49 if (!inode_owner_or_capable(inode
))
52 /* required for strict SunOS emulation */
53 if (O_NONBLOCK
!= O_NDELAY
)
57 /* Pipe packetized mode is controlled by O_DIRECT flag */
58 if (!S_ISFIFO(inode
->i_mode
) && (arg
& O_DIRECT
)) {
59 if (!filp
->f_mapping
|| !filp
->f_mapping
->a_ops
||
60 !filp
->f_mapping
->a_ops
->direct_IO
)
64 if (filp
->f_op
->check_flags
)
65 error
= filp
->f_op
->check_flags(arg
);
70 * ->fasync() is responsible for setting the FASYNC bit.
72 if (((arg
^ filp
->f_flags
) & FASYNC
) && filp
->f_op
->fasync
) {
73 error
= filp
->f_op
->fasync(fd
, filp
, (arg
& FASYNC
) != 0);
79 spin_lock(&filp
->f_lock
);
80 filp
->f_flags
= (arg
& SETFL_MASK
) | (filp
->f_flags
& ~SETFL_MASK
);
81 spin_unlock(&filp
->f_lock
);
87 static void f_modown(struct file
*filp
, struct pid
*pid
, enum pid_type type
,
90 write_lock_irq(&filp
->f_owner
.lock
);
91 if (force
|| !filp
->f_owner
.pid
) {
92 put_pid(filp
->f_owner
.pid
);
93 filp
->f_owner
.pid
= get_pid(pid
);
94 filp
->f_owner
.pid_type
= type
;
97 const struct cred
*cred
= current_cred();
98 filp
->f_owner
.uid
= cred
->uid
;
99 filp
->f_owner
.euid
= cred
->euid
;
102 write_unlock_irq(&filp
->f_owner
.lock
);
105 void __f_setown(struct file
*filp
, struct pid
*pid
, enum pid_type type
,
108 security_file_set_fowner(filp
);
109 f_modown(filp
, pid
, type
, force
);
111 EXPORT_SYMBOL(__f_setown
);
113 int f_setown(struct file
*filp
, unsigned long arg
, int force
)
116 struct pid
*pid
= NULL
;
117 int who
= arg
, ret
= 0;
121 /* avoid overflow below */
131 pid
= find_vpid(who
);
137 __f_setown(filp
, pid
, type
, force
);
142 EXPORT_SYMBOL(f_setown
);
144 void f_delown(struct file
*filp
)
146 f_modown(filp
, NULL
, PIDTYPE_PID
, 1);
149 pid_t
f_getown(struct file
*filp
)
152 read_lock(&filp
->f_owner
.lock
);
153 pid
= pid_vnr(filp
->f_owner
.pid
);
154 if (filp
->f_owner
.pid_type
== PIDTYPE_PGID
)
156 read_unlock(&filp
->f_owner
.lock
);
160 static int f_setown_ex(struct file
*filp
, unsigned long arg
)
162 struct f_owner_ex __user
*owner_p
= (void __user
*)arg
;
163 struct f_owner_ex owner
;
168 ret
= copy_from_user(&owner
, owner_p
, sizeof(owner
));
172 switch (owner
.type
) {
190 pid
= find_vpid(owner
.pid
);
191 if (owner
.pid
&& !pid
)
194 __f_setown(filp
, pid
, type
, 1);
200 static int f_getown_ex(struct file
*filp
, unsigned long arg
)
202 struct f_owner_ex __user
*owner_p
= (void __user
*)arg
;
203 struct f_owner_ex owner
;
206 read_lock(&filp
->f_owner
.lock
);
207 owner
.pid
= pid_vnr(filp
->f_owner
.pid
);
208 switch (filp
->f_owner
.pid_type
) {
210 owner
.type
= F_OWNER_TID
;
214 owner
.type
= F_OWNER_PID
;
218 owner
.type
= F_OWNER_PGRP
;
226 read_unlock(&filp
->f_owner
.lock
);
229 ret
= copy_to_user(owner_p
, &owner
, sizeof(owner
));
236 #ifdef CONFIG_CHECKPOINT_RESTORE
237 static int f_getowner_uids(struct file
*filp
, unsigned long arg
)
239 struct user_namespace
*user_ns
= current_user_ns();
240 uid_t __user
*dst
= (void __user
*)arg
;
244 read_lock(&filp
->f_owner
.lock
);
245 src
[0] = from_kuid(user_ns
, filp
->f_owner
.uid
);
246 src
[1] = from_kuid(user_ns
, filp
->f_owner
.euid
);
247 read_unlock(&filp
->f_owner
.lock
);
249 err
= put_user(src
[0], &dst
[0]);
250 err
|= put_user(src
[1], &dst
[1]);
255 static int f_getowner_uids(struct file
*filp
, unsigned long arg
)
261 static bool rw_hint_valid(enum rw_hint hint
)
264 case RWF_WRITE_LIFE_NOT_SET
:
265 case RWH_WRITE_LIFE_NONE
:
266 case RWH_WRITE_LIFE_SHORT
:
267 case RWH_WRITE_LIFE_MEDIUM
:
268 case RWH_WRITE_LIFE_LONG
:
269 case RWH_WRITE_LIFE_EXTREME
:
276 static long fcntl_rw_hint(struct file
*file
, unsigned int cmd
,
279 struct inode
*inode
= file_inode(file
);
280 u64
*argp
= (u64 __user
*)arg
;
285 case F_GET_FILE_RW_HINT
:
286 h
= file_write_hint(file
);
287 if (copy_to_user(argp
, &h
, sizeof(*argp
)))
290 case F_SET_FILE_RW_HINT
:
291 if (copy_from_user(&h
, argp
, sizeof(h
)))
293 hint
= (enum rw_hint
) h
;
294 if (!rw_hint_valid(hint
))
297 spin_lock(&file
->f_lock
);
298 file
->f_write_hint
= hint
;
299 spin_unlock(&file
->f_lock
);
302 h
= inode
->i_write_hint
;
303 if (copy_to_user(argp
, &h
, sizeof(*argp
)))
307 if (copy_from_user(&h
, argp
, sizeof(h
)))
309 hint
= (enum rw_hint
) h
;
310 if (!rw_hint_valid(hint
))
314 inode
->i_write_hint
= hint
;
322 static long do_fcntl(int fd
, unsigned int cmd
, unsigned long arg
,
325 void __user
*argp
= (void __user
*)arg
;
331 err
= f_dupfd(arg
, filp
, 0);
333 case F_DUPFD_CLOEXEC
:
334 err
= f_dupfd(arg
, filp
, O_CLOEXEC
);
337 err
= get_close_on_exec(fd
) ? FD_CLOEXEC
: 0;
341 set_close_on_exec(fd
, arg
& FD_CLOEXEC
);
347 err
= setfl(fd
, filp
, arg
);
349 #if BITS_PER_LONG != 32
350 /* 32-bit arches must use fcntl64() */
354 if (copy_from_user(&flock
, argp
, sizeof(flock
)))
356 err
= fcntl_getlk(filp
, cmd
, &flock
);
357 if (!err
&& copy_to_user(argp
, &flock
, sizeof(flock
)))
360 #if BITS_PER_LONG != 32
361 /* 32-bit arches must use fcntl64() */
368 if (copy_from_user(&flock
, argp
, sizeof(flock
)))
370 err
= fcntl_setlk(fd
, filp
, cmd
, &flock
);
374 * XXX If f_owner is a process group, the
375 * negative return value will get converted
376 * into an error. Oops. If we keep the
377 * current syscall conventions, the only way
378 * to fix this will be in libc.
380 err
= f_getown(filp
);
381 force_successful_syscall_return();
384 err
= f_setown(filp
, arg
, 1);
387 err
= f_getown_ex(filp
, arg
);
390 err
= f_setown_ex(filp
, arg
);
392 case F_GETOWNER_UIDS
:
393 err
= f_getowner_uids(filp
, arg
);
396 err
= filp
->f_owner
.signum
;
399 /* arg == 0 restores default behaviour. */
400 if (!valid_signal(arg
)) {
404 filp
->f_owner
.signum
= arg
;
407 err
= fcntl_getlease(filp
);
410 err
= fcntl_setlease(fd
, filp
, arg
);
413 err
= fcntl_dirnotify(fd
, filp
, arg
);
417 err
= pipe_fcntl(filp
, cmd
, arg
);
421 err
= shmem_fcntl(filp
, cmd
, arg
);
425 case F_GET_FILE_RW_HINT
:
426 case F_SET_FILE_RW_HINT
:
427 err
= fcntl_rw_hint(filp
, cmd
, arg
);
435 static int check_fcntl_cmd(unsigned cmd
)
439 case F_DUPFD_CLOEXEC
:
448 SYSCALL_DEFINE3(fcntl
, unsigned int, fd
, unsigned int, cmd
, unsigned long, arg
)
450 struct fd f
= fdget_raw(fd
);
456 if (unlikely(f
.file
->f_mode
& FMODE_PATH
)) {
457 if (!check_fcntl_cmd(cmd
))
461 err
= security_file_fcntl(f
.file
, cmd
, arg
);
463 err
= do_fcntl(fd
, cmd
, arg
, f
.file
);
471 #if BITS_PER_LONG == 32
472 SYSCALL_DEFINE3(fcntl64
, unsigned int, fd
, unsigned int, cmd
,
475 void __user
*argp
= (void __user
*)arg
;
476 struct fd f
= fdget_raw(fd
);
477 struct flock64 flock
;
483 if (unlikely(f
.file
->f_mode
& FMODE_PATH
)) {
484 if (!check_fcntl_cmd(cmd
))
488 err
= security_file_fcntl(f
.file
, cmd
, arg
);
496 if (copy_from_user(&flock
, argp
, sizeof(flock
)))
498 err
= fcntl_getlk64(f
.file
, cmd
, &flock
);
499 if (!err
&& copy_to_user(argp
, &flock
, sizeof(flock
)))
507 if (copy_from_user(&flock
, argp
, sizeof(flock
)))
509 err
= fcntl_setlk64(fd
, f
.file
, cmd
, &flock
);
512 err
= do_fcntl(fd
, cmd
, arg
, f
.file
);
523 /* careful - don't use anywhere else */
524 #define copy_flock_fields(dst, src) \
525 (dst)->l_type = (src)->l_type; \
526 (dst)->l_whence = (src)->l_whence; \
527 (dst)->l_start = (src)->l_start; \
528 (dst)->l_len = (src)->l_len; \
529 (dst)->l_pid = (src)->l_pid;
531 static int get_compat_flock(struct flock
*kfl
, const struct compat_flock __user
*ufl
)
533 struct compat_flock fl
;
535 if (copy_from_user(&fl
, ufl
, sizeof(struct compat_flock
)))
537 copy_flock_fields(kfl
, &fl
);
541 static int get_compat_flock64(struct flock
*kfl
, const struct compat_flock64 __user
*ufl
)
543 struct compat_flock64 fl
;
545 if (copy_from_user(&fl
, ufl
, sizeof(struct compat_flock64
)))
547 copy_flock_fields(kfl
, &fl
);
551 static int put_compat_flock(const struct flock
*kfl
, struct compat_flock __user
*ufl
)
553 struct compat_flock fl
;
555 memset(&fl
, 0, sizeof(struct compat_flock
));
556 copy_flock_fields(&fl
, kfl
);
557 if (copy_to_user(ufl
, &fl
, sizeof(struct compat_flock
)))
562 static int put_compat_flock64(const struct flock
*kfl
, struct compat_flock64 __user
*ufl
)
564 struct compat_flock64 fl
;
566 memset(&fl
, 0, sizeof(struct compat_flock64
));
567 copy_flock_fields(&fl
, kfl
);
568 if (copy_to_user(ufl
, &fl
, sizeof(struct compat_flock64
)))
572 #undef copy_flock_fields
575 convert_fcntl_cmd(unsigned int cmd
)
590 * GETLK was successful and we need to return the data, but it needs to fit in
591 * the compat structure.
592 * l_start shouldn't be too big, unless the original start + end is greater than
593 * COMPAT_OFF_T_MAX, in which case the app was asking for trouble, so we return
594 * -EOVERFLOW in that case. l_len could be too big, in which case we just
595 * truncate it, and only allow the app to see that part of the conflicting lock
596 * that might make sense to it anyway
598 static int fixup_compat_flock(struct flock
*flock
)
600 if (flock
->l_start
> COMPAT_OFF_T_MAX
)
602 if (flock
->l_len
> COMPAT_OFF_T_MAX
)
603 flock
->l_len
= COMPAT_OFF_T_MAX
;
607 COMPAT_SYSCALL_DEFINE3(fcntl64
, unsigned int, fd
, unsigned int, cmd
,
610 struct fd f
= fdget_raw(fd
);
617 if (unlikely(f
.file
->f_mode
& FMODE_PATH
)) {
618 if (!check_fcntl_cmd(cmd
))
622 err
= security_file_fcntl(f
.file
, cmd
, arg
);
628 err
= get_compat_flock(&flock
, compat_ptr(arg
));
631 err
= fcntl_getlk(f
.file
, convert_fcntl_cmd(cmd
), &flock
);
634 err
= fixup_compat_flock(&flock
);
637 err
= put_compat_flock(&flock
, compat_ptr(arg
));
641 err
= get_compat_flock64(&flock
, compat_ptr(arg
));
644 err
= fcntl_getlk(f
.file
, convert_fcntl_cmd(cmd
), &flock
);
647 err
= fixup_compat_flock(&flock
);
650 err
= put_compat_flock64(&flock
, compat_ptr(arg
));
654 err
= get_compat_flock(&flock
, compat_ptr(arg
));
657 err
= fcntl_setlk(fd
, f
.file
, convert_fcntl_cmd(cmd
), &flock
);
663 err
= get_compat_flock64(&flock
, compat_ptr(arg
));
666 err
= fcntl_setlk(fd
, f
.file
, convert_fcntl_cmd(cmd
), &flock
);
669 err
= do_fcntl(fd
, cmd
, arg
, f
.file
);
677 COMPAT_SYSCALL_DEFINE3(fcntl
, unsigned int, fd
, unsigned int, cmd
,
689 return compat_sys_fcntl64(fd
, cmd
, arg
);
693 /* Table to convert sigio signal codes into poll band bitmaps */
695 static const long band_table
[NSIGPOLL
] = {
696 POLLIN
| POLLRDNORM
, /* POLL_IN */
697 POLLOUT
| POLLWRNORM
| POLLWRBAND
, /* POLL_OUT */
698 POLLIN
| POLLRDNORM
| POLLMSG
, /* POLL_MSG */
699 POLLERR
, /* POLL_ERR */
700 POLLPRI
| POLLRDBAND
, /* POLL_PRI */
701 POLLHUP
| POLLERR
/* POLL_HUP */
704 static inline int sigio_perm(struct task_struct
*p
,
705 struct fown_struct
*fown
, int sig
)
707 const struct cred
*cred
;
711 cred
= __task_cred(p
);
712 ret
= ((uid_eq(fown
->euid
, GLOBAL_ROOT_UID
) ||
713 uid_eq(fown
->euid
, cred
->suid
) || uid_eq(fown
->euid
, cred
->uid
) ||
714 uid_eq(fown
->uid
, cred
->suid
) || uid_eq(fown
->uid
, cred
->uid
)) &&
715 !security_file_send_sigiotask(p
, fown
, sig
));
720 static void send_sigio_to_task(struct task_struct
*p
,
721 struct fown_struct
*fown
,
722 int fd
, int reason
, int group
)
725 * F_SETSIG can change ->signum lockless in parallel, make
726 * sure we read it once and use the same value throughout.
728 int signum
= ACCESS_ONCE(fown
->signum
);
730 if (!sigio_perm(p
, fown
, signum
))
736 /* Queue a rt signal with the appropriate fd as its
737 value. We use SI_SIGIO as the source, not
738 SI_KERNEL, since kernel signals always get
739 delivered even if we can't queue. Failure to
740 queue in this case _should_ be reported; we fall
741 back to SIGIO in that case. --sct */
742 si
.si_signo
= signum
;
746 * Posix definies POLL_IN and friends to be signal
747 * specific si_codes for SIG_POLL. Linux extended
748 * these si_codes to other signals in a way that is
749 * ambiguous if other signals also have signal
750 * specific si_codes. In that case use SI_SIGIO instead
751 * to remove the ambiguity.
753 if ((signum
!= SIGPOLL
) && sig_specific_sicodes(signum
))
754 si
.si_code
= SI_SIGIO
;
756 /* Make sure we are called with one of the POLL_*
757 reasons, otherwise we could leak kernel stack into
759 BUG_ON((reason
< POLL_IN
) || ((reason
- POLL_IN
) >= NSIGPOLL
));
760 if (reason
- POLL_IN
>= NSIGPOLL
)
763 si
.si_band
= band_table
[reason
- POLL_IN
];
765 if (!do_send_sig_info(signum
, &si
, p
, group
))
767 /* fall-through: fall back on the old plain SIGIO signal */
769 do_send_sig_info(SIGIO
, SEND_SIG_PRIV
, p
, group
);
773 void send_sigio(struct fown_struct
*fown
, int fd
, int band
)
775 struct task_struct
*p
;
780 read_lock(&fown
->lock
);
782 type
= fown
->pid_type
;
783 if (type
== PIDTYPE_MAX
) {
790 goto out_unlock_fown
;
792 read_lock(&tasklist_lock
);
793 do_each_pid_task(pid
, type
, p
) {
794 send_sigio_to_task(p
, fown
, fd
, band
, group
);
795 } while_each_pid_task(pid
, type
, p
);
796 read_unlock(&tasklist_lock
);
798 read_unlock(&fown
->lock
);
801 static void send_sigurg_to_task(struct task_struct
*p
,
802 struct fown_struct
*fown
, int group
)
804 if (sigio_perm(p
, fown
, SIGURG
))
805 do_send_sig_info(SIGURG
, SEND_SIG_PRIV
, p
, group
);
808 int send_sigurg(struct fown_struct
*fown
)
810 struct task_struct
*p
;
816 read_lock(&fown
->lock
);
818 type
= fown
->pid_type
;
819 if (type
== PIDTYPE_MAX
) {
826 goto out_unlock_fown
;
830 read_lock(&tasklist_lock
);
831 do_each_pid_task(pid
, type
, p
) {
832 send_sigurg_to_task(p
, fown
, group
);
833 } while_each_pid_task(pid
, type
, p
);
834 read_unlock(&tasklist_lock
);
836 read_unlock(&fown
->lock
);
840 static DEFINE_SPINLOCK(fasync_lock
);
841 static struct kmem_cache
*fasync_cache __read_mostly
;
843 static void fasync_free_rcu(struct rcu_head
*head
)
845 kmem_cache_free(fasync_cache
,
846 container_of(head
, struct fasync_struct
, fa_rcu
));
850 * Remove a fasync entry. If successfully removed, return
851 * positive and clear the FASYNC flag. If no entry exists,
852 * do nothing and return 0.
854 * NOTE! It is very important that the FASYNC flag always
855 * match the state "is the filp on a fasync list".
858 int fasync_remove_entry(struct file
*filp
, struct fasync_struct
**fapp
)
860 struct fasync_struct
*fa
, **fp
;
863 spin_lock(&filp
->f_lock
);
864 spin_lock(&fasync_lock
);
865 for (fp
= fapp
; (fa
= *fp
) != NULL
; fp
= &fa
->fa_next
) {
866 if (fa
->fa_file
!= filp
)
869 spin_lock_irq(&fa
->fa_lock
);
871 spin_unlock_irq(&fa
->fa_lock
);
874 call_rcu(&fa
->fa_rcu
, fasync_free_rcu
);
875 filp
->f_flags
&= ~FASYNC
;
879 spin_unlock(&fasync_lock
);
880 spin_unlock(&filp
->f_lock
);
884 struct fasync_struct
*fasync_alloc(void)
886 return kmem_cache_alloc(fasync_cache
, GFP_KERNEL
);
890 * NOTE! This can be used only for unused fasync entries:
891 * entries that actually got inserted on the fasync list
892 * need to be released by rcu - see fasync_remove_entry.
894 void fasync_free(struct fasync_struct
*new)
896 kmem_cache_free(fasync_cache
, new);
900 * Insert a new entry into the fasync list. Return the pointer to the
901 * old one if we didn't use the new one.
903 * NOTE! It is very important that the FASYNC flag always
904 * match the state "is the filp on a fasync list".
906 struct fasync_struct
*fasync_insert_entry(int fd
, struct file
*filp
, struct fasync_struct
**fapp
, struct fasync_struct
*new)
908 struct fasync_struct
*fa
, **fp
;
910 spin_lock(&filp
->f_lock
);
911 spin_lock(&fasync_lock
);
912 for (fp
= fapp
; (fa
= *fp
) != NULL
; fp
= &fa
->fa_next
) {
913 if (fa
->fa_file
!= filp
)
916 spin_lock_irq(&fa
->fa_lock
);
918 spin_unlock_irq(&fa
->fa_lock
);
922 spin_lock_init(&new->fa_lock
);
923 new->magic
= FASYNC_MAGIC
;
926 new->fa_next
= *fapp
;
927 rcu_assign_pointer(*fapp
, new);
928 filp
->f_flags
|= FASYNC
;
931 spin_unlock(&fasync_lock
);
932 spin_unlock(&filp
->f_lock
);
937 * Add a fasync entry. Return negative on error, positive if
938 * added, and zero if did nothing but change an existing one.
940 static int fasync_add_entry(int fd
, struct file
*filp
, struct fasync_struct
**fapp
)
942 struct fasync_struct
*new;
944 new = fasync_alloc();
949 * fasync_insert_entry() returns the old (update) entry if
952 * So free the (unused) new entry and return 0 to let the
953 * caller know that we didn't add any new fasync entries.
955 if (fasync_insert_entry(fd
, filp
, fapp
, new)) {
964 * fasync_helper() is used by almost all character device drivers
965 * to set up the fasync queue, and for regular files by the file
966 * lease code. It returns negative on error, 0 if it did no changes
967 * and positive if it added/deleted the entry.
969 int fasync_helper(int fd
, struct file
* filp
, int on
, struct fasync_struct
**fapp
)
972 return fasync_remove_entry(filp
, fapp
);
973 return fasync_add_entry(fd
, filp
, fapp
);
976 EXPORT_SYMBOL(fasync_helper
);
979 * rcu_read_lock() is held
981 static void kill_fasync_rcu(struct fasync_struct
*fa
, int sig
, int band
)
984 struct fown_struct
*fown
;
987 if (fa
->magic
!= FASYNC_MAGIC
) {
988 printk(KERN_ERR
"kill_fasync: bad magic number in "
992 spin_lock_irqsave(&fa
->fa_lock
, flags
);
994 fown
= &fa
->fa_file
->f_owner
;
995 /* Don't send SIGURG to processes which have not set a
996 queued signum: SIGURG has its own default signalling
998 if (!(sig
== SIGURG
&& fown
->signum
== 0))
999 send_sigio(fown
, fa
->fa_fd
, band
);
1001 spin_unlock_irqrestore(&fa
->fa_lock
, flags
);
1002 fa
= rcu_dereference(fa
->fa_next
);
1006 void kill_fasync(struct fasync_struct
**fp
, int sig
, int band
)
1008 /* First a quick test without locking: usually
1009 * the list is empty.
1013 kill_fasync_rcu(rcu_dereference(*fp
), sig
, band
);
1017 EXPORT_SYMBOL(kill_fasync
);
1019 static int __init
fcntl_init(void)
1022 * Please add new bits here to ensure allocation uniqueness.
1023 * Exceptions: O_NONBLOCK is a two bit define on parisc; O_NDELAY
1024 * is defined as O_NONBLOCK on some platforms and not on others.
1026 BUILD_BUG_ON(21 - 1 /* for O_RDONLY being 0 */ !=
1028 (VALID_OPEN_FLAGS
& ~(O_NONBLOCK
| O_NDELAY
)) |
1029 __FMODE_EXEC
| __FMODE_NONOTIFY
));
1031 fasync_cache
= kmem_cache_create("fasync_cache",
1032 sizeof(struct fasync_struct
), 0, SLAB_PANIC
, NULL
);
1036 module_init(fcntl_init
)