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fs: add do_compat_futimesat() helper; remove in-kernel call to compat syscall 

Using the fs-internal do_compat_futimesat() helper allows us to get rid of
the fs-internal call to the compat_sys_futimesat() 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>
This commit is contained in:
Dominik Brodowski 2018-03-20 19:39:44 +01:00
parent 570484bfe8
commit ab641afa73
1 changed files with 10 additions and 2 deletions
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12
fs/utimes.c
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@ -260,7 +260,8 @@ COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filena
return do_utimes(dfd, filename, t ? tv : NULL, flags);
}
COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd, const char __user *, filename, struct compat_timeval __user *, t)
static long do_compat_futimesat(unsigned int dfd, const char __user *filename,
struct compat_timeval __user *t)
{
struct timespec64 tv[2];
@ -279,8 +280,15 @@ COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd, const char __user *, filena
return do_utimes(dfd, filename, t ? tv : NULL, 0);
}
COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd,
const char __user *, filename,
struct compat_timeval __user *, t)
{
return do_compat_futimesat(dfd, filename, t);
}
COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct compat_timeval __user *, t)
{
return compat_sys_futimesat(AT_FDCWD, filename, t);
return do_compat_futimesat(AT_FDCWD, filename, t);
}
#endif