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    Subject[PATCH 06/45] fs: add do_lookup_dcookie() helper; remove in-kernel call to syscall
    Date
    Using the fs-internal do_lookup_dcookie() helper allows us to get rid of
    fs-internal calls to the sys_lookup_dcookie() syscall.

    This patch is part of a series which tries to remove in-kernel calls to
    syscalls. On this basis, the syscall entry path can be streamlined.

    Cc: Al Viro <viro@zeniv.linux.org.uk>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
    ---
    fs/dcookies.c | 11 ++++++++---
    1 file changed, 8 insertions(+), 3 deletions(-)

    diff --git a/fs/dcookies.c b/fs/dcookies.c
    index 0d0461cf2431..57bc96435feb 100644
    --- a/fs/dcookies.c
    +++ b/fs/dcookies.c
    @@ -146,7 +146,7 @@ int get_dcookie(const struct path *path, unsigned long *cookie)
    /* And here is where the userspace process can look up the cookie value
    * to retrieve the path.
    */
    -SYSCALL_DEFINE3(lookup_dcookie, u64, cookie64, char __user *, buf, size_t, len)
    +static int do_lookup_dcookie(u64 cookie64, char __user *buf, size_t len)
    {
    unsigned long cookie = (unsigned long)cookie64;
    int err = -EINVAL;
    @@ -203,13 +203,18 @@ SYSCALL_DEFINE3(lookup_dcookie, u64, cookie64, char __user *, buf, size_t, len)
    return err;
    }

    +SYSCALL_DEFINE3(lookup_dcookie, u64, cookie64, char __user *, buf, size_t, len)
    +{
    + return do_lookup_dcookie(cookie64, buf, len);
    +}
    +
    #ifdef CONFIG_COMPAT
    COMPAT_SYSCALL_DEFINE4(lookup_dcookie, u32, w0, u32, w1, char __user *, buf, compat_size_t, len)
    {
    #ifdef __BIG_ENDIAN
    - return sys_lookup_dcookie(((u64)w0 << 32) | w1, buf, len);
    + return do_lookup_dcookie(((u64)w0 << 32) | w1, buf, len);
    #else
    - return sys_lookup_dcookie(((u64)w1 << 32) | w0, buf, len);
    + return do_lookup_dcookie(((u64)w1 << 32) | w0, buf, len);
    #endif
    }
    #endif
    --
    2.16.2
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