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/*
* Copyright (C) 2005-2014 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* module global variables and operations
*/
#include <linux/module.h>
#include <linux/seq_file.h>
#include "aufs.h"
void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp)
{
if (new_sz <= nused)
return p;
p = krealloc(p, new_sz, gfp);
if (p)
memset(p + nused, 0, new_sz - nused);
return p;
}
/* ---------------------------------------------------------------------- */
/*
* aufs caches
*/
struct kmem_cache *au_cachep[AuCache_Last];
static int __init au_cache_init(void)
{
au_cachep[AuCache_DINFO] = AuCacheCtor(au_dinfo, au_di_init_once);
if (au_cachep[AuCache_DINFO])
/* SLAB_DESTROY_BY_RCU */
au_cachep[AuCache_ICNTNR] = AuCacheCtor(au_icntnr,
au_icntnr_init_once);
if (au_cachep[AuCache_ICNTNR])
au_cachep[AuCache_FINFO] = AuCacheCtor(au_finfo,
au_fi_init_once);
if (au_cachep[AuCache_FINFO])
au_cachep[AuCache_VDIR] = AuCache(au_vdir);
if (au_cachep[AuCache_VDIR])
au_cachep[AuCache_DEHSTR] = AuCache(au_vdir_dehstr);
if (au_cachep[AuCache_DEHSTR])
return 0;
return -ENOMEM;
}
static void au_cache_fin(void)
{
int i;
/*
* Make sure all delayed rcu free inodes are flushed before we
* destroy cache.
*/
rcu_barrier();
/* excluding AuCache_HNOTIFY */
BUILD_BUG_ON(AuCache_HNOTIFY + 1 != AuCache_Last);
for (i = 0; i < AuCache_HNOTIFY; i++)
if (au_cachep[i]) {
kmem_cache_destroy(au_cachep[i]);
au_cachep[i] = NULL;
}
}
/* ---------------------------------------------------------------------- */
int au_dir_roflags;
#ifdef CONFIG_AUFS_SBILIST
/*
* iterate_supers_type() doesn't protect us from
* remounting (branch management)
*/
struct au_splhead au_sbilist;
#endif
struct lock_class_key au_lc_key[AuLcKey_Last];
/*
* functions for module interface.
*/
MODULE_LICENSE("GPL");
/* MODULE_LICENSE("GPL v2"); */
MODULE_AUTHOR("Junjiro R. Okajima <aufs-users@lists.sourceforge.net>");
MODULE_DESCRIPTION(AUFS_NAME
" -- Advanced multi layered unification filesystem");
MODULE_VERSION(AUFS_VERSION);
MODULE_ALIAS_FS(AUFS_NAME);
MODULE_INFO(staging, "Y");
/* this module parameter has no meaning when SYSFS is disabled */
int sysaufs_brs = 1;
MODULE_PARM_DESC(brs, "use <sysfs>/fs/aufs/si_*/brN");
module_param_named(brs, sysaufs_brs, int, S_IRUGO);
/* this module parameter has no meaning when USER_NS is disabled */
static bool au_userns;
MODULE_PARM_DESC(allow_userns, "allow unprivileged to mount under userns");
module_param_named(allow_userns, au_userns, bool, S_IRUGO);
/* ---------------------------------------------------------------------- */
static char au_esc_chars[0x20 + 3]; /* 0x01-0x20, backslash, del, and NULL */
int au_seq_path(struct seq_file *seq, struct path *path)
{
return seq_path(seq, path, au_esc_chars);
}
/* ---------------------------------------------------------------------- */
static int __init aufs_init(void)
{
int err, i;
char *p;
p = au_esc_chars;
for (i = 1; i <= ' '; i++)
*p++ = i;
*p++ = '\\';
*p++ = '\x7f';
*p = 0;
au_dir_roflags = au_file_roflags(O_DIRECTORY | O_LARGEFILE);
au_sbilist_init();
sysaufs_brs_init();
au_debug_init();
au_dy_init();
err = sysaufs_init();
if (unlikely(err))
goto out;
err = au_procfs_init();
if (unlikely(err))
goto out_sysaufs;
err = au_wkq_init();
if (unlikely(err))
goto out_procfs;
err = au_loopback_init();
if (unlikely(err))
goto out_wkq;
err = au_hnotify_init();
if (unlikely(err))
goto out_loopback;
err = au_sysrq_init();
if (unlikely(err))
goto out_hin;
err = au_cache_init();
if (unlikely(err))
goto out_sysrq;
aufs_fs_type.fs_flags |= au_userns ? FS_USERNS_MOUNT : 0;
err = register_filesystem(&aufs_fs_type);
if (unlikely(err))
goto out_cache;
/* since we define pr_fmt, call printk directly */
printk(KERN_INFO AUFS_NAME " " AUFS_VERSION "\n");
goto out; /* success */
out_cache:
au_cache_fin();
out_sysrq:
au_sysrq_fin();
out_hin:
au_hnotify_fin();
out_loopback:
au_loopback_fin();
out_wkq:
au_wkq_fin();
out_procfs:
au_procfs_fin();
out_sysaufs:
sysaufs_fin();
au_dy_fin();
out:
return err;
}
static void __exit aufs_exit(void)
{
unregister_filesystem(&aufs_fs_type);
au_cache_fin();
au_sysrq_fin();
au_hnotify_fin();
au_loopback_fin();
au_wkq_fin();
au_procfs_fin();
sysaufs_fin();
au_dy_fin();
}
module_init(aufs_init);
module_exit(aufs_exit);
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