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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-20 19:29:53 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 20:15:42 +0200
commite02af2ff654806c5dc93412fffd77d67d1125ccc (patch)
tree43f31b20bcc22e244c0c4243d7d5e3c4701a1a74 /fs/fcntl.c
parentfs: add kern_select() helper; remove in-kernel call to sys_select() (diff)
downloadlinux-dev-e02af2ff654806c5dc93412fffd77d67d1125ccc.tar.xz
linux-dev-e02af2ff654806c5dc93412fffd77d67d1125ccc.zip
fs: add do_compat_fcntl64() helper; remove in-kernel call to compat syscall
Using the fs-internal do_compat_fcntl64() helper allows us to get rid of the fs-internal call to the compat_sys_fcntl64() 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/fcntl.c')
-rw-r--r--fs/fcntl.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 1e97f1fda90c..d737ff082472 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -607,8 +607,8 @@ static int fixup_compat_flock(struct flock *flock)
return 0;
}
-COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
- compat_ulong_t, arg)
+static long do_compat_fcntl64(unsigned int fd, unsigned int cmd,
+ compat_ulong_t arg)
{
struct fd f = fdget_raw(fd);
struct flock flock;
@@ -672,6 +672,12 @@ out_put:
return err;
}
+COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
+ compat_ulong_t, arg)
+{
+ return do_compat_fcntl64(fd, cmd, arg);
+}
+
COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd,
compat_ulong_t, arg)
{
@@ -684,7 +690,7 @@ COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd,
case F_OFD_SETLKW:
return -EINVAL;
}
- return compat_sys_fcntl64(fd, cmd, arg);
+ return do_compat_fcntl64(fd, cmd, arg);
}
#endif