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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-19 17:38:31 +0100 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-04-02 20:16:09 +0200 |
| commit | 36028d5dd71175c332ab634e089e16dbdfe3812b (patch) | |
| tree | d25084dfe2fe7c0a070cad40333a365af076695c /include/linux/syscalls.h | |
| parent | df260e21e6cd5d2dfc1fe9b6a3bbf747e72b3bed (diff) | |
| download | lwn-36028d5dd71175c332ab634e089e16dbdfe3812b.tar.gz lwn-36028d5dd71175c332ab634e089e16dbdfe3812b.zip | |
fs: add ksys_p{read,write}64() helpers; remove in-kernel calls to syscalls
Using the ksys_p{read,write}64() wrappers allows us to get rid of
in-kernel calls to the sys_pread64() and sys_pwrite64() syscalls.
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_p{read,write}64().
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 | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index 78b79e3a1279..a30e4c2d0c27 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -965,6 +965,10 @@ int ksys_unshare(unsigned long unshare_flags); int ksys_setsid(void); int ksys_sync_file_range(int fd, loff_t offset, loff_t nbytes, unsigned int flags); +ssize_t ksys_pread64(unsigned int fd, char __user *buf, size_t count, + loff_t pos); +ssize_t ksys_pwrite64(unsigned int fd, const char __user *buf, + size_t count, loff_t pos); /* * The following kernel syscall equivalents are just wrappers to fs-internal |