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166 lines
4.3 KiB
166 lines
4.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Copyright (C) 2005-2020 Junjiro R. Okajima |
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* |
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* This program, aufs is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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/* |
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* module initialization and module-global |
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*/ |
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#ifndef __AUFS_MODULE_H__ |
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#define __AUFS_MODULE_H__ |
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#ifdef __KERNEL__ |
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#include <linux/slab.h> |
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#include "debug.h" |
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#include "dentry.h" |
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#include "dir.h" |
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#include "file.h" |
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#include "inode.h" |
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struct path; |
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struct seq_file; |
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/* module parameters */ |
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extern int sysaufs_brs; |
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extern bool au_userns; |
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/* ---------------------------------------------------------------------- */ |
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extern int au_dir_roflags; |
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void *au_krealloc(void *p, unsigned int new_sz, gfp_t gfp, int may_shrink); |
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void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp, |
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int may_shrink); |
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/* |
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* Comparing the size of the object with sizeof(struct rcu_head) |
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* case 1: object is always larger |
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* --> au_kfree_rcu() or au_kfree_do_rcu() |
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* case 2: object is always smaller |
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* --> au_kfree_small() |
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* case 3: object can be any size |
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* --> au_kfree_try_rcu() |
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*/ |
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static inline void au_kfree_do_rcu(const void *p) |
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{ |
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struct { |
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struct rcu_head rcu; |
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} *a = (void *)p; |
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kfree_rcu(a, rcu); |
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} |
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#define au_kfree_rcu(_p) do { \ |
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typeof(_p) p = (_p); \ |
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BUILD_BUG_ON(sizeof(*p) < sizeof(struct rcu_head)); \ |
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if (p) \ |
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au_kfree_do_rcu(p); \ |
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} while (0) |
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#define au_kfree_do_sz_test(sz) (sz >= sizeof(struct rcu_head)) |
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#define au_kfree_sz_test(p) (p && au_kfree_do_sz_test(ksize(p))) |
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static inline void au_kfree_try_rcu(const void *p) |
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{ |
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if (!p) |
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return; |
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if (au_kfree_sz_test(p)) |
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au_kfree_do_rcu(p); |
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else |
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kfree(p); |
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} |
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static inline void au_kfree_small(const void *p) |
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{ |
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if (!p) |
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return; |
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AuDebugOn(au_kfree_sz_test(p)); |
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kfree(p); |
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} |
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static inline int au_kmidx_sub(size_t sz, size_t new_sz) |
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{ |
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#ifndef CONFIG_SLOB |
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return kmalloc_index(sz) - kmalloc_index(new_sz); |
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#else |
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return -1; /* SLOB is untested */ |
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#endif |
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} |
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int au_seq_path(struct seq_file *seq, struct path *path); |
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#ifdef CONFIG_PROC_FS |
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/* procfs.c */ |
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int __init au_procfs_init(void); |
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void au_procfs_fin(void); |
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#else |
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AuStubInt0(au_procfs_init, void); |
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AuStubVoid(au_procfs_fin, void); |
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#endif |
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/* ---------------------------------------------------------------------- */ |
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/* kmem cache */ |
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enum { |
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AuCache_DINFO, |
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AuCache_ICNTNR, |
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AuCache_FINFO, |
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AuCache_VDIR, |
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AuCache_DEHSTR, |
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AuCache_HNOTIFY, /* must be last */ |
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AuCache_Last |
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}; |
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extern struct kmem_cache *au_cache[AuCache_Last]; |
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#define AuCacheFlags (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD) |
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#define AuCache(type) KMEM_CACHE(type, AuCacheFlags) |
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#define AuCacheCtor(type, ctor) \ |
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kmem_cache_create(#type, sizeof(struct type), \ |
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__alignof__(struct type), AuCacheFlags, ctor) |
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#define AuCacheFuncs(name, index) \ |
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static inline struct au_##name *au_cache_alloc_##name(void) \ |
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{ return kmem_cache_alloc(au_cache[AuCache_##index], GFP_NOFS); } \ |
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static inline void au_cache_free_##name##_norcu(struct au_##name *p) \ |
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{ kmem_cache_free(au_cache[AuCache_##index], p); } \ |
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\ |
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static inline void au_cache_free_##name##_rcu_cb(struct rcu_head *rcu) \ |
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{ void *p = rcu; \ |
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p -= offsetof(struct au_##name, rcu); \ |
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kmem_cache_free(au_cache[AuCache_##index], p); } \ |
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static inline void au_cache_free_##name##_rcu(struct au_##name *p) \ |
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{ BUILD_BUG_ON(sizeof(struct au_##name) < sizeof(struct rcu_head)); \ |
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call_rcu(&p->rcu, au_cache_free_##name##_rcu_cb); } \ |
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\ |
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static inline void au_cache_free_##name(struct au_##name *p) \ |
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{ /* au_cache_free_##name##_norcu(p); */ \ |
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au_cache_free_##name##_rcu(p); } |
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AuCacheFuncs(dinfo, DINFO); |
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AuCacheFuncs(icntnr, ICNTNR); |
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AuCacheFuncs(finfo, FINFO); |
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AuCacheFuncs(vdir, VDIR); |
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AuCacheFuncs(vdir_dehstr, DEHSTR); |
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#ifdef CONFIG_AUFS_HNOTIFY |
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AuCacheFuncs(hnotify, HNOTIFY); |
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#endif |
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#endif /* __KERNEL__ */ |
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#endif /* __AUFS_MODULE_H__ */
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