fanotify: fanotify_init syscall declaration

This patch defines a new syscall fanotify_init() of the form:

int sys_fanotify_init(unsigned int flags, unsigned int event_f_flags,
		      unsigned int priority)

This syscall is used to create and fanotify group.  This is very similar to
the inotify_init() syscall.
Signed-off-by: Eric Paris <eparis@redhat.com>

arch/x86/ia32/ia32entry.S

@@ -842,4 +842,5 @@ ia32_sys_call_table:
 	.quad compat_sys_rt_tgsigqueueinfo	/* 335 */
 	.quad sys_perf_event_open
 	.quad compat_sys_recvmmsg
+	.quad sys_fanotify_init
 ia32_syscall_end:

arch/x86/include/asm/unistd_32.h

@@ -343,10 +343,11 @@
 #define __NR_rt_tgsigqueueinfo	335
 #define __NR_perf_event_open	336
 #define __NR_recvmmsg		337
+#define __NR_fanotify_init	338
 
 #ifdef __KERNEL__
 
-#define NR_syscalls 338
+#define NR_syscalls 339
 
 #define __ARCH_WANT_IPC_PARSE_VERSION
 #define __ARCH_WANT_OLD_READDIR

arch/x86/include/asm/unistd_64.h

@@ -663,6 +663,8 @@ __SYSCALL(__NR_rt_tgsigqueueinfo, sys_rt_tgsigqueueinfo)
 __SYSCALL(__NR_perf_event_open, sys_perf_event_open)
 #define __NR_recvmmsg				299
 __SYSCALL(__NR_recvmmsg, sys_recvmmsg)
+#define __NR_fanotify_init			300
+__SYSCALL(__NR_fanotify_init, sys_fanotify_init)
 
 #ifndef __NO_STUBS
 #define __ARCH_WANT_OLD_READDIR

arch/x86/kernel/syscall_table_32.S

@@ -337,3 +337,4 @@ ENTRY(sys_call_table)
 	.long sys_rt_tgsigqueueinfo	/* 335 */
 	.long sys_perf_event_open
 	.long sys_recvmmsg
+	.long sys_fanotify_init

fs/notify/fanotify/Makefile

-obj-$(CONFIG_FANOTIFY)		+= fanotify.o
+obj-$(CONFIG_FANOTIFY)		+= fanotify.o fanotify_user.o

fs/notify/fanotify/fanotify_user.c

+#include <linux/fcntl.h>
+#include <linux/fs.h>
+#include <linux/fsnotify_backend.h>
+#include <linux/security.h>
+#include <linux/syscalls.h>
+
+#include "fanotify.h"
+
+SYSCALL_DEFINE3(fanotify_init, unsigned int, flags, unsigned int, event_f_flags,
+		unsigned int, priority)
+{
+	return -ENOSYS;
+}

include/linux/syscalls.h

@@ -813,6 +813,8 @@ asmlinkage long sys_pselect6(int, fd_set __user *, fd_set __user *,
 asmlinkage long sys_ppoll(struct pollfd __user *, unsigned int,
 			  struct timespec __user *, const sigset_t __user *,
 			  size_t);
+asmlinkage long sys_fanotify_init(unsigned int flags, unsigned int event_f_flags,
+				  unsigned int priority);
 
 int kernel_execve(const char *filename, char *const argv[], char *const envp[]);
 

kernel/sys_ni.c

@@ -181,3 +181,6 @@ cond_syscall(sys_eventfd2);
 
 /* performance counters: */
 cond_syscall(sys_perf_event_open);
+
+/* fanotify! */
+cond_syscall(sys_fanotify_init);