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/*
* Copyright (C) 2005-2016 Junjiro R. Okajima
*/
/*
* 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 au_dfree au_dfree;
/* delayed free */
static void au_do_dfree(struct work_struct *work __maybe_unused)
{
struct llist_head *head;
struct llist_node *node, *next;
#define AU_CACHE_DFREE_DO_BODY(name, idx, lnode) do { \
head = &au_dfree.cache[AuCache_##idx].llist; \
node = llist_del_all(head); \
for (; node; node = next) { \
struct au_##name *p = \
p = llist_entry(node, struct au_##name, \
lnode); \
next = llist_next(node); \
au_cache_free_##name(p); \
} \
} while (0)
AU_CACHE_DFREE_DO_BODY(dinfo, DINFO, di_lnode);
AU_CACHE_DFREE_DO_BODY(icntnr, ICNTNR, lnode);
AU_CACHE_DFREE_DO_BODY(finfo, FINFO, fi_lnode);
AU_CACHE_DFREE_DO_BODY(vdir, VDIR, vd_lnode);
AU_CACHE_DFREE_DO_BODY(vdir_dehstr, DEHSTR, lnode);
#ifdef CONFIG_AUFS_HNOTIFY
AU_CACHE_DFREE_DO_BODY(hnotify, HNOTIFY, hn_lnode);
#endif
#define AU_DFREE_DO_BODY(llist, func) do { \
node = llist_del_all(llist); \
for (; node; node = next) { \
next = llist_next(node); \
func(node); \
} \
} while (0)
AU_DFREE_DO_BODY(au_dfree.llist + AU_DFREE_KFREE, kfree);
AU_DFREE_DO_BODY(au_dfree.llist + AU_DFREE_FREE_PAGE, au_free_page);
#undef AU_CACHE_DFREE_DO_BODY
#undef AU_DFREE_DO_BODY
}
AU_CACHE_DFREE_FUNC(dinfo, DINFO, di_lnode);
AU_CACHE_DFREE_FUNC(icntnr, ICNTNR, lnode);
AU_CACHE_DFREE_FUNC(finfo, FINFO, fi_lnode);
AU_CACHE_DFREE_FUNC(vdir, VDIR, vd_lnode);
AU_CACHE_DFREE_FUNC(vdir_dehstr, DEHSTR, lnode);
static void au_cache_fin(void)
{
int i;
struct au_cache *cp;
/*
* 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);
flush_delayed_work(&au_dfree.dwork);
for (i = 0; i < AuCache_HNOTIFY; i++) {
cp = au_dfree.cache + i;
AuDebugOn(!llist_empty(&cp->llist));
kmem_cache_destroy(cp->cache);
cp->cache = NULL;
}
}
static int __init au_cache_init(void)
{
struct au_cache *cp;
cp = au_dfree.cache;
cp[AuCache_DINFO].cache = AuCacheCtor(au_dinfo, au_di_init_once);
if (cp[AuCache_DINFO].cache)
/* SLAB_DESTROY_BY_RCU */
cp[AuCache_ICNTNR].cache = AuCacheCtor(au_icntnr,
au_icntnr_init_once);
if (cp[AuCache_ICNTNR].cache)
cp[AuCache_FINFO].cache = AuCacheCtor(au_finfo,
au_fi_init_once);
if (cp[AuCache_FINFO].cache)
cp[AuCache_VDIR].cache = AuCache(au_vdir);
if (cp[AuCache_VDIR].cache)
cp[AuCache_DEHSTR].cache = AuCache(au_vdir_dehstr);
if (cp[AuCache_DEHSTR].cache)
return 0;
au_cache_fin();
return -ENOMEM;
}
/* ---------------------------------------------------------------------- */
int au_dir_roflags;
#ifdef CONFIG_AUFS_SBILIST
/*
* iterate_supers_type() doesn't protect us from
* remounting (branch management)
*/
struct au_sphlhead au_sbilist;
#endif
/*
* 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);
/* 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 */
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)
{
int err;
err = seq_path(seq, path, au_esc_chars);
if (err > 0)
err = 0;
else if (err < 0)
err = -ENOMEM;
return err;
}
/* ---------------------------------------------------------------------- */
static int __init aufs_init(void)
{
int err, i;
char *p;
struct au_cache *cp;
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);
memcpy(aufs_iop_nogetattr, aufs_iop, sizeof(aufs_iop));
for (i = 0; i < AuIop_Last; i++)
aufs_iop_nogetattr[i].getattr = NULL;
/* First, initialize au_dfree */
for (i = 0; i < AuCache_Last; i++) { /* including hnotify */
cp = au_dfree.cache + i;
cp->cache = NULL;
init_llist_head(&cp->llist);
}
for (i = 0; i < AU_DFREE_Last; i++)
init_llist_head(au_dfree.llist + i);
INIT_DELAYED_WORK(&au_dfree.dwork, au_do_dfree);
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();
flush_delayed_work(&au_dfree.dwork);
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();
flush_delayed_work(&au_dfree.dwork);
}
module_init(aufs_init);
module_exit(aufs_exit);
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