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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-13 23:56:26 +0300 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-04-02 21:16:04 +0300 |
| commit | 3ce4a7bf66263748194b77ccefd284be963c6304 (patch) | |
| tree | 69ff6bec0f1186e6e4662c628449c5ced2f8b0d3 /fs | |
| parent | 76847e4344350970e1c2e27c28b5abb3c588c5b3 (diff) | |
| download | linux-3ce4a7bf66263748194b77ccefd284be963c6304.tar.xz | |
fs: add ksys_read() helper; remove in-kernel calls to sys_read()
Using this helper allows us to avoid the in-kernel calls to the
sys_read() 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_read().
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>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/read_write.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index b38b008a078e..fc441e1ac683 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -568,7 +568,7 @@ static inline void file_pos_write(struct file *file, loff_t pos) file->f_pos = pos; } -SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count) +ssize_t ksys_read(unsigned int fd, char __user *buf, size_t count) { struct fd f = fdget_pos(fd); ssize_t ret = -EBADF; @@ -583,6 +583,11 @@ SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count) return ret; } +SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count) +{ + return ksys_read(fd, buf, count); +} + ssize_t ksys_write(unsigned int fd, const char __user *buf, size_t count) { struct fd f = fdget_pos(fd); |