flag parameters: inotify_init

This patch introduces the new syscall inotify_init1 (note: the 1 stands for
the one parameter the syscall takes, as opposed to no parameter before).  The
values accepted for this parameter are function-specific and defined in the
inotify.h header.  Here the values must match the O_* flags, though.  In this
patch CLOEXEC support is introduced.

The following test must be adjusted for architectures other than x86 and
x86-64 and in case the syscall numbers changed.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/syscall.h>

#ifndef __NR_inotify_init1
# ifdef __x86_64__
#  define __NR_inotify_init1 294
# elif defined __i386__
#  define __NR_inotify_init1 332
# else
#  error "need __NR_inotify_init1"
# endif
#endif

#define IN_CLOEXEC O_CLOEXEC

int
main (void)
{
  int fd;
  fd = syscall (__NR_inotify_init1, 0);
  if (fd == -1)
    {
      puts ("inotify_init1(0) failed");
      return 1;
    }
  int coe = fcntl (fd, F_GETFD);
  if (coe == -1)
    {
      puts ("fcntl failed");
      return 1;
    }
  if (coe & FD_CLOEXEC)
    {
      puts ("inotify_init1(0) set close-on-exit");
      return 1;
    }
  close (fd);

  fd = syscall (__NR_inotify_init1, IN_CLOEXEC);
  if (fd == -1)
    {
      puts ("inotify_init1(IN_CLOEXEC) failed");
      return 1;
    }
  coe = fcntl (fd, F_GETFD);
  if (coe == -1)
    {
      puts ("fcntl failed");
      return 1;
    }
  if ((coe & FD_CLOEXEC) == 0)
    {
      puts ("inotify_init1(O_CLOEXEC) does not set close-on-exit");
      return 1;
    }
  close (fd);

  puts ("OK");

  return 0;
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[akpm@linux-foundation.org: add sys_ni stub]
Signed-off-by: Ulrich Drepper <drepper@redhat.com>
Acked-by: Davide Libenzi <davidel@xmailserver.org>
Cc: Michael Kerrisk <mtk.manpages@googlemail.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index 18808b164570b2b31a32bf3ce0b821f9adf350d4..4541073dd837a8ebf6add002f39810f80ee7294b 100644 (file)
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -831,4 +831,5 @@ ia32_sys_call_table:
        .quad sys_epoll_create2
        .quad sys_dup3                  /* 330 */
        .quad sys_pipe2
+       .quad sys_inotify_init1
 ia32_syscall_end:

diff --git a/arch/x86/kernel/syscall_table_32.S b/arch/x86/kernel/syscall_table_32.S
index 66154769d52f666a8a327675dff63b485a4dd005..f59aba5ff0f0c4cb8c6acd981570b61da528771a 100644 (file)
--- a/arch/x86/kernel/syscall_table_32.S
+++ b/arch/x86/kernel/syscall_table_32.S
@@ -331,3 +331,4 @@ ENTRY(sys_call_table)
        .long sys_epoll_create2
        .long sys_dup3                  /* 330 */
        .long sys_pipe2
+       .long sys_inotify_init1

diff --git a/fs/inotify_user.c b/fs/inotify_user.c
index 6676c06bb7c16935b3a7fbc4615836f1dfb256fb..851005998cd449e6fb450bbc93af0862f9f95008 100644 (file)
--- a/fs/inotify_user.c
+++ b/fs/inotify_user.c
@@ -566,7 +566,7 @@ static const struct inotify_operations inotify_user_ops = {
        .destroy_watch  = free_inotify_user_watch,
 };
 
-asmlinkage long sys_inotify_init(void)
+asmlinkage long sys_inotify_init1(int flags)
 {
        struct inotify_device *dev;
        struct inotify_handle *ih;
@@ -574,7 +574,10 @@ asmlinkage long sys_inotify_init(void)
        struct file *filp;
        int fd, ret;
 
-       fd = get_unused_fd();
+       if (flags & ~IN_CLOEXEC)
+               return -EINVAL;
+
+       fd = get_unused_fd_flags(flags & O_CLOEXEC);
        if (fd < 0)
                return fd;
 
@@ -638,6 +641,11 @@ out_put_fd:
        return ret;
 }
 
+asmlinkage long sys_inotify_init(void)
+{
+       return sys_inotify_init1(0);
+}
+
 asmlinkage long sys_inotify_add_watch(int fd, const char __user *path, u32 mask)
 {
        struct inode *inode;

diff --git a/include/asm-x86/unistd_32.h b/include/asm-x86/unistd_32.h
index 748a05c77da481b180830cbff50b7fbdd29e2298..b3daf503ab937199b93a1e741f2c6d6bcf72e999 100644 (file)
--- a/include/asm-x86/unistd_32.h
+++ b/include/asm-x86/unistd_32.h
@@ -337,6 +337,7 @@
 #define __NR_epoll_create2     329
 #define __NR_dup3              330
 #define __NR_pipe2             331
+#define __NR_inotify_init1     332
 
 #ifdef __KERNEL__
 

diff --git a/include/asm-x86/unistd_64.h b/include/asm-x86/unistd_64.h
index d2284b43ad58408439d958a4e16ca498e40889a9..c8cb88d70c6be27252c76625b2d9da6ac6959310 100644 (file)
--- a/include/asm-x86/unistd_64.h
+++ b/include/asm-x86/unistd_64.h
@@ -651,6 +651,8 @@ __SYSCALL(__NR_epoll_create2, sys_epoll_create2)
 __SYSCALL(__NR_dup3, sys_dup3)
 #define __NR_pipe2                             293
 __SYSCALL(__NR_pipe2, sys_pipe2)
+#define __NR_inotify_init1                     294
+__SYSCALL(__NR_inotify_init1, sys_inotify_init1)
 
 
 #ifndef __NO_STUBS

diff --git a/include/linux/inotify.h b/include/linux/inotify.h
index 742b917e7d1b274e5582ec30d387b4d881fe5915..72ef82120512a3ea7be7f893f3f7717726103146 100644 (file)
--- a/include/linux/inotify.h
+++ b/include/linux/inotify.h
@@ -7,6 +7,8 @@
 #ifndef _LINUX_INOTIFY_H
 #define _LINUX_INOTIFY_H
 
+/* For O_CLOEXEC */
+#include <linux/fcntl.h>
 #include <linux/types.h>
 
 /*
@@ -63,6 +65,9 @@ struct inotify_event {
                         IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF | \
                         IN_MOVE_SELF)
 
+/* Flags for sys_inotify_init1.  */
+#define IN_CLOEXEC O_CLOEXEC
+
 #ifdef __KERNEL__
 
 #include <linux/dcache.h>

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 034d3358549e39782da92b781a0e533869f6d9f1..93a7e7f017a655d9fb72035d707bf5fa1bd51420 100644 (file)
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -547,6 +547,7 @@ asmlinkage long sys_get_mempolicy(int __user *policy,
                                unsigned long addr, unsigned long flags);
 
 asmlinkage long sys_inotify_init(void);
+asmlinkage long sys_inotify_init1(int flags);
 asmlinkage long sys_inotify_add_watch(int fd, const char __user *path,
                                        u32 mask);
 asmlinkage long sys_inotify_rm_watch(int fd, u32 wd);

diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 2a361ccdc7ca0ba68d099e3473d1c583e03b3fd2..bd66ac5406f398cd0c6544132f9864a3b2dbb3b0 100644 (file)
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -96,6 +96,7 @@ cond_syscall(sys_keyctl);
 cond_syscall(compat_sys_keyctl);
 cond_syscall(compat_sys_socketcall);
 cond_syscall(sys_inotify_init);
+cond_syscall(sys_inotify_init1);
 cond_syscall(sys_inotify_add_watch);
 cond_syscall(sys_inotify_rm_watch);
 cond_syscall(sys_migrate_pages);