fs/aufs/module.h

   1 /*
   2  * Copyright (C) 2005-2017 Junjiro R. Okajima
   3  *
   4  * This program, aufs is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /*
  19  * module initialization and module-global
  20  */
  21
  22 #ifndef __AUFS_MODULE_H__
  23 #define __AUFS_MODULE_H__
  24
  25 #ifdef __KERNEL__
  26
  27 #include <linux/slab.h>
  28
  29 struct path;
  30 struct seq_file;
  31
  32 /* module parameters */
  33 extern int sysaufs_brs;
  34 extern bool au_userns;
  35
  36 /* ---------------------------------------------------------------------- */
  37
  38 extern int au_dir_roflags;
  39
  40 void *au_krealloc(void *p, unsigned int new_sz, gfp_t gfp, int may_shrink);
  41 void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp,
  42                    int may_shrink);
  43
  44 static inline int au_kmidx_sub(size_t sz, size_t new_sz)
  45 {
  46 #ifndef CONFIG_SLOB
  47         return kmalloc_index(sz) - kmalloc_index(new_sz);
  48 #else
  49         return -1; /* SLOB is untested */
  50 #endif
  51 }
  52
  53 int au_seq_path(struct seq_file *seq, struct path *path);
  54
  55 #ifdef CONFIG_PROC_FS
  56 /* procfs.c */
  57 int __init au_procfs_init(void);
  58 void au_procfs_fin(void);
  59 #else
  60 AuStubInt0(au_procfs_init, void);
  61 AuStubVoid(au_procfs_fin, void);
  62 #endif
  63
  64 /* ---------------------------------------------------------------------- */
  65
  66 /* kmem cache */
  67 enum {
  68         AuCache_DINFO,
  69         AuCache_ICNTNR,
  70         AuCache_FINFO,
  71         AuCache_VDIR,
  72         AuCache_DEHSTR,
  73         AuCache_HNOTIFY, /* must be last */
  74         AuCache_Last
  75 };
  76
  77 extern struct kmem_cache *au_cache[AuCache_Last];
  78
  79 #define AuCacheFlags            (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD)
  80 #define AuCache(type)           KMEM_CACHE(type, AuCacheFlags)
  81 #define AuCacheCtor(type, ctor) \
  82         kmem_cache_create(#type, sizeof(struct type), \
  83                           __alignof__(struct type), AuCacheFlags, ctor)
  84
  85 #define AuCacheFuncs(name, index) \
  86 static inline struct au_##name *au_cache_alloc_##name(void) \
  87 { return kmem_cache_alloc(au_cache[AuCache_##index], GFP_NOFS); } \
  88 static inline void au_cache_free_##name(struct au_##name *p) \
  89 { kmem_cache_free(au_cache[AuCache_##index], p); }
  90
  91 AuCacheFuncs(dinfo, DINFO);
  92 AuCacheFuncs(icntnr, ICNTNR);
  93 AuCacheFuncs(finfo, FINFO);
  94 AuCacheFuncs(vdir, VDIR);
  95 AuCacheFuncs(vdir_dehstr, DEHSTR);
  96 #ifdef CONFIG_AUFS_HNOTIFY
  97 AuCacheFuncs(hnotify, HNOTIFY);
  98 #endif
  99
 100 #endif /* __KERNEL__ */
 101 #endif /* __AUFS_MODULE_H__ */