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>
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Коммит
30cfe4ef8b
12
fs/splice.c
12
fs/splice.c
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@ -1331,8 +1331,8 @@ static long vmsplice_to_pipe(struct file *file, const struct iovec __user *uiov,
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* Currently we punt and implement it as a normal copy, see pipe_to_user().
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*
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*/
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SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, iov,
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unsigned long, nr_segs, unsigned int, flags)
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static long do_vmsplice(int fd, const struct iovec __user *iov,
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unsigned long nr_segs, unsigned int flags)
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{
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struct fd f;
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long error;
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@ -1358,6 +1358,12 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, iov,
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return error;
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}
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SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, iov,
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unsigned long, nr_segs, unsigned int, flags)
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{
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return do_vmsplice(fd, iov, nr_segs, flags);
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}
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#ifdef CONFIG_COMPAT
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COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, iov32,
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unsigned int, nr_segs, unsigned int, flags)
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@ -1375,7 +1381,7 @@ COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, io
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put_user(v.iov_len, &iov[i].iov_len))
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return -EFAULT;
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}
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return sys_vmsplice(fd, iov, nr_segs, flags);
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return do_vmsplice(fd, iov, nr_segs, flags);
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}
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#endif
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