/* * JFFS2 -- Journalling Flash File System, Version 2. * * Copyright © 2001-2007 Red Hat, Inc. * * Created by David Woodhouse <dwmw2@infradead.org> * * For licensing information, see the file 'LICENCE' in this directory. * */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/kernel.h>#include <linux/slab.h>#include <linux/init.h>#include <linux/jffs2.h>#include "nodelist.h" /* These are initialised to NULL in the kernel startup code.   If you're porting to other operating systems, beware */static struct kmem_cache *full_dnode_slab;static struct kmem_cache *raw_dirent_slab;static struct kmem_cache *raw_inode_slab;static struct kmem_cache *tmp_dnode_info_slab;static struct kmem_cache *raw_node_ref_slab;static struct kmem_cache *node_frag_slab;static struct kmem_cache *inode_cache_slab;#ifdef CONFIG_JFFS2_FS_XATTRstatic struct kmem_cache *xattr_datum_cache;static struct kmem_cache *xattr_ref_cache;#endif int __init jffs2_create_slab_caches(void){	full_dnode_slab = KMEM_CACHE(jffs2_full_dnode, 0);	if (!full_dnode_slab)		goto err; 	raw_dirent_slab = KMEM_CACHE(jffs2_raw_dirent, SLAB_HWCACHE_ALIGN);	if (!raw_dirent_slab)		goto err; 	raw_inode_slab = KMEM_CACHE(jffs2_raw_inode, SLAB_HWCACHE_ALIGN);	if (!raw_inode_slab)		goto err; 	tmp_dnode_info_slab = KMEM_CACHE(jffs2_tmp_dnode_info, 0);	if (!tmp_dnode_info_slab)		goto err; 	raw_node_ref_slab = kmem_cache_create("jffs2_refblock",					      sizeof(struct jffs2_raw_node_ref) * (REFS_PER_BLOCK + 1),					      0, 0, NULL);	if (!raw_node_ref_slab)		goto err; 	node_frag_slab = KMEM_CACHE(jffs2_node_frag, 0);	if (!node_frag_slab)		goto err; 	inode_cache_slab = KMEM_CACHE(jffs2_inode_cache, 0);	if (!inode_cache_slab)		goto err; #ifdef CONFIG_JFFS2_FS_XATTR	xattr_datum_cache = KMEM_CACHE(jffs2_xattr_datum, 0);	if (!xattr_datum_cache)		goto err; 	xattr_ref_cache = KMEM_CACHE(jffs2_xattr_ref, 0);	if (!xattr_ref_cache)		goto err;#endif 	return 0; err:	jffs2_destroy_slab_caches();	return -ENOMEM;} void jffs2_destroy_slab_caches(void){	kmem_cache_destroy(full_dnode_slab);	kmem_cache_destroy(raw_dirent_slab);	kmem_cache_destroy(raw_inode_slab);	kmem_cache_destroy(tmp_dnode_info_slab);	kmem_cache_destroy(raw_node_ref_slab);	kmem_cache_destroy(node_frag_slab);	kmem_cache_destroy(inode_cache_slab);#ifdef CONFIG_JFFS2_FS_XATTR	kmem_cache_destroy(xattr_datum_cache);	kmem_cache_destroy(xattr_ref_cache);#endif} struct jffs2_full_dirent *jffs2_alloc_full_dirent(int namesize){	struct jffs2_full_dirent *ret;	ret = kmalloc(sizeof(struct jffs2_full_dirent) + namesize, GFP_KERNEL);	dbg_memalloc("%p\n", ret);	return ret;} void jffs2_free_full_dirent(struct jffs2_full_dirent *x){	dbg_memalloc("%p\n", x);	kfree(x);} struct jffs2_full_dnode *jffs2_alloc_full_dnode(void){	struct jffs2_full_dnode *ret;	ret = kmem_cache_alloc(full_dnode_slab, GFP_KERNEL);	dbg_memalloc("%p\n", ret);	return ret;} void jffs2_free_full_dnode(struct jffs2_full_dnode *x){	dbg_memalloc("%p\n", x);	kmem_cache_free(full_dnode_slab, x);} struct jffs2_raw_dirent *jffs2_alloc_raw_dirent(void){	struct jffs2_raw_dirent *ret;	ret = kmem_cache_alloc(raw_dirent_slab, GFP_KERNEL);	dbg_memalloc("%p\n", ret);	return ret;} void jffs2_free_raw_dirent(struct jffs2_raw_dirent *x){	dbg_memalloc("%p\n", x);	kmem_cache_free(raw_dirent_slab, x);} struct jffs2_raw_inode *jffs2_alloc_raw_inode(void){	struct jffs2_raw_inode *ret;	ret = kmem_cache_alloc(raw_inode_slab, GFP_KERNEL);	dbg_memalloc("%p\n", ret);	return ret;} void jffs2_free_raw_inode(struct jffs2_raw_inode *x){	dbg_memalloc("%p\n", x);	kmem_cache_free(raw_inode_slab, x);} struct jffs2_tmp_dnode_info *jffs2_alloc_tmp_dnode_info(void){	struct jffs2_tmp_dnode_info *ret;	ret = kmem_cache_alloc(tmp_dnode_info_slab, GFP_KERNEL);	dbg_memalloc("%p\n",		ret);	return ret;} void jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info *x){	dbg_memalloc("%p\n", x);	kmem_cache_free(tmp_dnode_info_slab, x);} static struct jffs2_raw_node_ref *jffs2_alloc_refblock(void){	struct jffs2_raw_node_ref *ret; 	ret = kmem_cache_alloc(raw_node_ref_slab, GFP_KERNEL);	if (ret) {		int i = 0;		for (i=0; i < REFS_PER_BLOCK; i++) {			ret[i].flash_offset = REF_EMPTY_NODE;			ret[i].next_in_ino = NULL;		}		ret[i].flash_offset = REF_LINK_NODE;		ret[i].next_in_ino = NULL;	}	return ret;} int jffs2_prealloc_raw_node_refs(struct jffs2_sb_info *c,				 struct jffs2_eraseblock *jeb, int nr){	struct jffs2_raw_node_ref **p, *ref;	int i = nr; 	dbg_memalloc("%d\n", nr); 	p = &jeb->last_node;	ref = *p; 	dbg_memalloc("Reserving %d refs for block @0x%08x\n", nr, jeb->offset); 	/* If jeb->last_node is really a valid node then skip over it */	if (ref && ref->flash_offset != REF_EMPTY_NODE)		ref++; 	while (i) {		if (!ref) {			dbg_memalloc("Allocating new refblock linked from %p\n", p);			ref = *p = jffs2_alloc_refblock();			if (!ref)				return -ENOMEM;		}		if (ref->flash_offset == REF_LINK_NODE) {			p = &ref->next_in_ino;			ref = *p;			continue;		}		i--;		ref++;	}	jeb->allocated_refs = nr; 	dbg_memalloc("Reserved %d refs for block @0x%08x, last_node is %p (%08x,%p)\n",		  nr, jeb->offset, jeb->last_node, jeb->last_node->flash_offset,		  jeb->last_node->next_in_ino); 	return 0;} void jffs2_free_refblock(struct jffs2_raw_node_ref *x){	dbg_memalloc("%p\n", x);	kmem_cache_free(raw_node_ref_slab, x);} struct jffs2_node_frag *jffs2_alloc_node_frag(void){	struct jffs2_node_frag *ret;	ret = kmem_cache_alloc(node_frag_slab, GFP_KERNEL);	dbg_memalloc("%p\n", ret);	return ret;} void jffs2_free_node_frag(struct jffs2_node_frag *x){	dbg_memalloc("%p\n", x);	kmem_cache_free(node_frag_slab, x);} struct jffs2_inode_cache *jffs2_alloc_inode_cache(void){	struct jffs2_inode_cache *ret;	ret = kmem_cache_alloc(inode_cache_slab, GFP_KERNEL);	dbg_memalloc("%p\n", ret);	return ret;} void jffs2_free_inode_cache(struct jffs2_inode_cache *x){	dbg_memalloc("%p\n", x);	kmem_cache_free(inode_cache_slab, x);} #ifdef CONFIG_JFFS2_FS_XATTRstruct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void){	struct jffs2_xattr_datum *xd;	xd = kmem_cache_zalloc(xattr_datum_cache, GFP_KERNEL);	dbg_memalloc("%p\n", xd);	if (!xd)		return NULL; 	xd->class = RAWNODE_CLASS_XATTR_DATUM;	xd->node = (void *)xd;	INIT_LIST_HEAD(&xd->xindex);	return xd;} void jffs2_free_xattr_datum(struct jffs2_xattr_datum *xd){	dbg_memalloc("%p\n", xd);	kmem_cache_free(xattr_datum_cache, xd);} struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void){	struct jffs2_xattr_ref *ref;	ref = kmem_cache_zalloc(xattr_ref_cache, GFP_KERNEL);	dbg_memalloc("%p\n", ref);	if (!ref)		return NULL; 	ref->class = RAWNODE_CLASS_XATTR_REF;	ref->node = (void *)ref;	return ref;} void jffs2_free_xattr_ref(struct jffs2_xattr_ref *ref){	dbg_memalloc("%p\n", ref);	kmem_cache_free(xattr_ref_cache, ref);}#endif