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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-17 17:00:24 +0300 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-04-02 21:15:40 +0300 |
| commit | 30cfe4ef8b8948842a48de7955ca0522568eeb6d (patch) | |
| tree | 962f553daa1c08547bdda475bc98200caa87f81e /fs/splice.c | |
| parent | 98e5f7bd2c67f4028a0797393092f8730118d713 (diff) | |
| download | linux-30cfe4ef8b8948842a48de7955ca0522568eeb6d.tar.xz | |
fs: add do_vmsplice() helper; remove in-kernel call to syscall
Using the fs-internal do_vmsplice() helper allows us to get rid of the
fs-internal call to the sys_vmsplice() syscall.
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 'fs/splice.c')
| -rw-r--r-- | fs/splice.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/fs/splice.c b/fs/splice.c index 39e2dc01ac12..005d09cf3fa8 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -1331,8 +1331,8 @@ static long vmsplice_to_pipe(struct file *file, const struct iovec __user *uiov, * Currently we punt and implement it as a normal copy, see pipe_to_user(). * */ -SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, iov, - unsigned long, nr_segs, unsigned int, flags) +static long do_vmsplice(int fd, const struct iovec __user *iov, + unsigned long nr_segs, unsigned int flags) { struct fd f; long error; @@ -1358,6 +1358,12 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, iov, return error; } +SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, iov, + unsigned long, nr_segs, unsigned int, flags) +{ + return do_vmsplice(fd, iov, nr_segs, flags); +} + #ifdef CONFIG_COMPAT COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, iov32, unsigned int, nr_segs, unsigned int, flags) @@ -1375,7 +1381,7 @@ COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, io put_user(v.iov_len, &iov[i].iov_len)) return -EFAULT; } - return sys_vmsplice(fd, iov, nr_segs, flags); + return do_vmsplice(fd, iov, nr_segs, flags); } #endif |