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    Subject[PATCH 10/23] vfs: Teach do_path_lookup to use file_hotplug_lock
    From: Eric W. Biederman <ebiederm@maxwell.aristanetworks.com>

    Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
    ---
    fs/namei.c | 11 +++++++++--
    1 files changed, 9 insertions(+), 2 deletions(-)

    diff --git a/fs/namei.c b/fs/namei.c
    index 5472ed0..c4c6575 100644
    --- a/fs/namei.c
    +++ b/fs/namei.c
    @@ -1049,23 +1049,30 @@ static int path_init(int dfd, const char *name, unsigned int flags, struct namei
    if (!file)
    goto out_fail;

    + retval = -EIO;
    + if (!file_hotplug_read_trylock(file))
    + goto fput_fail;
    +
    dentry = file->f_path.dentry;

    retval = -ENOTDIR;
    if (!S_ISDIR(dentry->d_inode->i_mode))
    - goto fput_fail;
    + goto unlock_fail;

    retval = file_permission(file, MAY_EXEC);
    if (retval)
    - goto fput_fail;
    + goto unlock_fail;

    nd->path = file->f_path;
    path_get(&file->f_path);

    + file_hotplug_read_unlock(file);
    fput_light(file, fput_needed);
    }
    return 0;

    +unlock_fail:
    + file_hotplug_read_unlock(file);
    fput_fail:
    fput_light(file, fput_needed);
    out_fail:
    --
    1.6.3.1.54.g99dd.dirty


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