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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-11 11:34:56 +0100 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-04-02 20:16:01 +0200 |
| commit | bae217ea8c7e123ed3fb1064909a262924771bbb (patch) | |
| tree | 52e92c1130a87a5985698e469ee8673679553dd2 /include/linux/syscalls.h | |
| parent | 2ca2a09d6215fd9621aa3e2db7cc9428a61f2911 (diff) | |
| download | linux-stable-bae217ea8c7e123ed3fb1064909a262924771bbb.tar.gz linux-stable-bae217ea8c7e123ed3fb1064909a262924771bbb.tar.bz2 linux-stable-bae217ea8c7e123ed3fb1064909a262924771bbb.zip | |
fs: add ksys_open() wrapper; remove in-kernel calls to sys_open()
Using this wrapper allows us to avoid the in-kernel calls to the
sys_open() syscall. The ksys_ prefix denotes that this function is meant
as a drop-in replacement for the syscall. In particular, it uses the
same calling convention as sys_open().
This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'include/linux/syscalls.h')
| -rw-r--r-- | include/linux/syscalls.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index 38805f3447ea..f9df17dcec1c 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -1057,4 +1057,15 @@ static inline int ksys_close(unsigned int fd) return __close_fd(current->files, fd); } +extern long do_sys_open(int dfd, const char __user *filename, int flags, + umode_t mode); + +static inline long ksys_open(const char __user *filename, int flags, + umode_t mode) +{ + if (force_o_largefile()) + flags |= O_LARGEFILE; + return do_sys_open(AT_FDCWD, filename, flags, mode); +} + #endif |