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fs: add do_fchownat(), ksys_fchown() helpers and ksys_{,l}chown() wrappers

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Using the fs-interal do_fchownat() wrapper allows us to get rid of
fs-internal calls to the sys_fchownat() syscall.

Introducing the ksys_fchown() helper and the ksys_{,}chown() wrappers
allows us to avoid the in-kernel calls to the sys_{,l,f}chown() syscalls.
The ksys_ prefix denotes that these functions are meant as a drop-in
replacement for the syscalls. In particular, they use the same calling
convention as sys_{,l,f}chown().

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 2018-03-11 11:34:55 +01:00
commit 55731b3cda
6 changed files with 46 additions and 16 deletions
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17
include/linux/syscalls.h
View file

@ -954,6 +954,7 @@ int ksys_chroot(const char __user *filename);
ssize_t ksys_write(unsigned int fd, const char __user *buf, size_t count);
int ksys_chdir(const char __user *filename);
int ksys_fchmod(unsigned int fd, umode_t mode);
int ksys_fchown(unsigned int fd, uid_t user, gid_t group);
/*
* The following kernel syscall equivalents are just wrappers to fs-internal
@ -1021,4 +1022,20 @@ static inline long ksys_access(const char __user *filename, int mode)
return do_faccessat(AT_FDCWD, filename, mode);
}
extern int do_fchownat(int dfd, const char __user *filename, uid_t user,
gid_t group, int flag);
static inline long ksys_chown(const char __user *filename, uid_t user,
gid_t group)
{
return do_fchownat(AT_FDCWD, filename, user, group, 0);
}
static inline long ksys_lchown(const char __user *filename, uid_t user,
gid_t group)
{
return do_fchownat(AT_FDCWD, filename, user, group,
AT_SYMLINK_NOFOLLOW);
}
#endif