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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-11 13:34:55 +0300
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 21:15:59 +0300
commit55731b3cda3a85ee888dac3bf1f36489f275c187 (patch)
treea322dc9efdd89932a35b294d221f90eccad45f23 /fs/internal.h
parentcbfe20f565228966f0249f016752437df95df679 (diff)
downloadlinux-55731b3cda3a85ee888dac3bf1f36489f275c187.tar.xz
fs: add do_fchownat(), ksys_fchown() helpers and ksys_{,l}chown() wrappers
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>
Diffstat (limited to 'fs/internal.h')
-rw-r--r--fs/internal.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/internal.h b/fs/internal.h
index 26f4f05b52ef..c797480cbd6f 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -121,6 +121,8 @@ extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
long do_faccessat(int dfd, const char __user *filename, int mode);
int do_fchmodat(int dfd, const char __user *filename, umode_t mode);
+int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
+ int flag);
extern int open_check_o_direct(struct file *f);
extern int vfs_open(const struct path *, struct file *, const struct cred *);