[PATCH -V6 7/8] x86: Add new syscalls for x86_64

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

Add sys_name_to_handle, sys_lname_to_handle, sys_open_by_handle syscall
and sys_freadlink for x86_64

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 arch/x86/ia32/ia32entry.S        |    3 +++
 arch/x86/include/asm/unistd_64.h |    6 ++++++
 fs/compat.c                      |   10 ++++++++++
 fs/open.c                        |    2 +-
 include/linux/fs.h               |    1 +
 5 files changed, 21 insertions(+), 1 deletions(-)

diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index e790bc1..2f4c979 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -842,4 +842,7 @@ ia32_sys_call_table:
 	.quad compat_sys_rt_tgsigqueueinfo	/* 335 */
 	.quad sys_perf_event_open
 	.quad compat_sys_recvmmsg
+	.quad sys_name_to_handle_at
+	.quad compat_sys_open_by_handle
+	.quad sys_freadlink			/* 340 */
 ia32_syscall_end:
diff --git a/arch/x86/include/asm/unistd_64.h b/arch/x86/include/asm/unistd_64.h
index ff4307b..c32428d 100644
--- a/arch/x86/include/asm/unistd_64.h
+++ b/arch/x86/include/asm/unistd_64.h
@@ -663,6 +663,12 @@ __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_name_to_handle_at			300
+__SYSCALL(__NR_name_to_handle, sys_name_to_handle)
+#define __NR_open_by_handle			301
+__SYSCALL(__NR_open_by_handle, sys_open_by_handle)
+#define __NR_freadlink				302
+__SYSCALL(__NR_freadlink, sys_freadlink)
 
 #ifndef __NO_STUBS
 #define __ARCH_WANT_OLD_READDIR
diff --git a/fs/compat.c b/fs/compat.c
index 4b6ed03..5c71c98 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -2310,3 +2310,13 @@ asmlinkage long compat_sys_timerfd_gettime(int ufd,
 }
 
 #endif /* CONFIG_TIMERFD */
+
+/*
+ * Exactly like fs/open.c:sys_open_by_handle(), except that it doesn't set the
+ * O_LARGEFILE flag.
+ */
+asmlinkage long
+compat_sys_open_by_handle(struct file_handle __user *handle, int flags)
+{
+	return do_sys_open_by_handle(handle, flags);
+}
diff --git a/fs/open.c b/fs/open.c
index e0a0cb1..9b114cd 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -1316,7 +1316,7 @@ static struct dentry *handle_to_dentry(struct vfsmount *mnt,
 	return dentry;
 }
 
-static long do_sys_open_by_handle(struct file_handle __user *ufh, int flags)
+long do_sys_open_by_handle(struct file_handle __user *ufh, int flags)
 {
 	int fd;
 	int retval = 0;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index da6d297..d1c2051 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1933,6 +1933,7 @@ extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
 				 const struct cred *);
 extern int filp_close(struct file *, fl_owner_t id);
 extern char * getname(const char __user *);
+extern long do_sys_open_by_handle(struct file_handle __user *, int);
 
 /* fs/ioctl.c */
 
-- 
1.7.0.4.360.g11766c