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Subject[PATCH -V14 08/11] x86: Add new syscalls for x86_64
Date
Add sys_name_to_handle_at and sys_open_by_handle_at syscalls
for x86_64

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
arch/x86/ia32/ia32entry.S | 2 ++
arch/x86/include/asm/unistd_64.h | 4 ++++
fs/compat.c | 11 +++++++++++
fs/open.c | 20 ++++++++++----------
include/linux/fs.h | 1 +
5 files changed, 28 insertions(+), 10 deletions(-)
diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index e790bc1..99f9623 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -842,4 +842,6 @@ 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_at /* 339 */
ia32_syscall_end:
diff --git a/arch/x86/include/asm/unistd_64.h b/arch/x86/include/asm/unistd_64.h
index ff4307b..6afd818 100644
--- a/arch/x86/include/asm/unistd_64.h
+++ b/arch/x86/include/asm/unistd_64.h
@@ -663,6 +663,10 @@ __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_at, sys_name_to_handle_at)
+#define __NR_open_by_handle_at 301
+__SYSCALL(__NR_open_by_handle_at, sys_open_by_handle_at)

#ifndef __NO_STUBS
#define __ARCH_WANT_OLD_READDIR
diff --git a/fs/compat.c b/fs/compat.c
index 6490d21..dc662ac 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -2332,3 +2332,14 @@ asmlinkage long compat_sys_timerfd_gettime(int ufd,
}

#endif /* CONFIG_TIMERFD */
+
+/*
+ * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
+ * doesn't set the O_LARGEFILE flag.
+ */
+asmlinkage long
+compat_sys_open_by_handle_at(int mountdirfd,
+ struct file_handle __user *handle, int flags)
+{
+ return do_sys_open_by_handle(mountdirfd, handle, flags);
+}
diff --git a/fs/open.c b/fs/open.c
index 1c5daa3..43093af 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -1231,8 +1231,8 @@ out_err:
return ERR_PTR(retval);
}

-static long do_sys_open_by_handle(int mountdirfd,
- struct file_handle __user *ufh, int open_flag)
+long do_sys_open_by_handle(int mountdirfd,
+ struct file_handle __user *ufh, int open_flag)
{
long retval = 0;
int fd, acc_mode;
@@ -1334,6 +1334,14 @@ out_handle:
out_err:
return retval;
}
+#else
+long do_sys_open_by_handle(int mountdirfd,
+ struct file_handle __user *ufh, int open_flag)
+{
+
+ return -ENOSYS;
+}
+#endif

/**
* sys_open_by_handle_at: Open the file handle
@@ -1358,11 +1366,3 @@ SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
ret = do_sys_open_by_handle(mountdirfd, handle, flags);
return ret;
}
-#else
-SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
- struct file_handle __user *, handle,
- int, flags)
-{
- return -ENOSYS;
-}
-#endif
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1415cad..34d4f60 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1930,6 +1930,7 @@ 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(int, struct file_handle __user *, int);

/* fs/ioctl.c */

--
1.7.1.331.ga5080


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