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    Subject[RFC Aufs2 #5 19/29] aufs ioctl
    Date
    initial commit
    currently for maintenance only

    Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
    ---
    fs/aufs/ioctl.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 54 insertions(+), 0 deletions(-)
    create mode 100644 fs/aufs/ioctl.c

    diff --git a/fs/aufs/ioctl.c b/fs/aufs/ioctl.c
    new file mode 100644
    index 0000000..ff17d77
    --- /dev/null
    +++ b/fs/aufs/ioctl.c
    @@ -0,0 +1,54 @@
    +/*
    + * Copyright (C) 2005-2009 Junjiro R. Okajima
    + *
    + * This program, aufs is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +#include <linux/uaccess.h>
    +#include "aufs.h"
    +
    +long aufs_ioctl_dir(struct file *file, unsigned int cmd,
    + unsigned long arg __maybe_unused)
    +{
    + long err;
    + struct super_block *sb;
    + struct au_sbinfo *sbinfo;
    +
    + err = -EACCES;
    + if (!capable(CAP_SYS_ADMIN))
    + goto out;
    +
    + err = 0;
    + sb = file->f_dentry->d_sb;
    + sbinfo = au_sbi(sb);
    + switch (cmd) {
    + case AUFS_CTL_PLINK_MAINT:
    + /*
    + * pseudo-link maintenance mode,
    + * cleared by aufs_release_dir()
    + */
    + si_write_lock(sb);
    + if (!au_ftest_si(sbinfo, MAINTAIN_PLINK)) {
    + au_fset_si(sbinfo, MAINTAIN_PLINK);
    + au_fi(file)->fi_maintain_plink = 1;
    + } else
    + err = -EBUSY;
    + si_write_unlock(sb);
    + break;
    + case AUFS_CTL_PLINK_CLEAN:
    + if (au_opt_test(sbinfo->si_mntflags, PLINK)) {
    + aufs_write_lock(sb->s_root);
    + au_plink_put(sb);
    + aufs_write_unlock(sb->s_root);
    + }
    + break;
    + default:
    + err = -EINVAL;
    + }
    +
    + out:
    + return err;
    +}
    --
    1.6.1.284.g5dc13


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