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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-11 13:34:41 +0300 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-04-02 21:15:51 +0300 |
| commit | e7a3e8b2edf544ec28f689385c3adc2903f46ec0 (patch) | |
| tree | f2fa667f8c2a6774aa466ab378a11e4c27cbd066 /fs/read_write.c | |
| parent | a16fe33ab5572e52ef4cb9719d6eb49623b2528a (diff) | |
| download | linux-e7a3e8b2edf544ec28f689385c3adc2903f46ec0.tar.xz | |
fs: add ksys_write() helper; remove in-kernel calls to sys_write()
Using this helper allows us to avoid the in-kernel calls to the sys_write()
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_write().
In the near future, the do_mounts / initramfs callers of ksys_write()
should be converted to use filp_open() and vfs_write() instead.
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: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-s390@vger.kernel.org
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'fs/read_write.c')
| -rw-r--r-- | fs/read_write.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index f8547b82dfb3..8e8f0b4f52e2 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -578,8 +578,7 @@ SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count) return ret; } -SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf, - size_t, count) +ssize_t ksys_write(unsigned int fd, const char __user *buf, size_t count) { struct fd f = fdget_pos(fd); ssize_t ret = -EBADF; @@ -595,6 +594,12 @@ SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf, return ret; } +SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf, + size_t, count) +{ + return ksys_write(fd, buf, count); +} + SYSCALL_DEFINE4(pread64, unsigned int, fd, char __user *, buf, size_t, count, loff_t, pos) { |