/* * 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. * */ #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_XATTR static 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_create("jffs2_full_dnode", sizeof(struct jffs2_full_dnode), 0, 0, NULL); if (!full_dnode_slab) goto err; raw_dirent_slab = kmem_cache_create("jffs2_raw_dirent", sizeof(struct jffs2_raw_dirent), 0, 0, NULL); if (!raw_dirent_slab) goto err; raw_inode_slab = kmem_cache_create("jffs2_raw_inode", sizeof(struct jffs2_raw_inode), 0, 0, NULL); if (!raw_inode_slab) goto err; tmp_dnode_info_slab = kmem_cache_create("jffs2_tmp_dnode", sizeof(struct jffs2_tmp_dnode_info), 0, 0, NULL); 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_create("jffs2_node_frag", sizeof(struct jffs2_node_frag), 0, 0, NULL); if (!node_frag_slab) goto err; inode_cache_slab = kmem_cache_create("jffs2_inode_cache", sizeof(struct jffs2_inode_cache), 0, 0, NULL); if (!inode_cache_slab) goto err; #ifdef CONFIG_JFFS2_FS_XATTR xattr_datum_cache = kmem_cache_create("jffs2_xattr_datum", sizeof(struct jffs2_xattr_datum), 0, 0, NULL); if (!xattr_datum_cache) goto err; xattr_ref_cache = kmem_cache_create("jffs2_xattr_ref", sizeof(struct jffs2_xattr_ref), 0, 0, NULL); if (!xattr_ref_cache) goto err; #endif return 0; err: jffs2_destroy_slab_caches(); return -ENOMEM; } void jffs2_destroy_slab_caches(void) { if(full_dnode_slab) kmem_cache_destroy(full_dnode_slab); if(raw_dirent_slab) kmem_cache_destroy(raw_dirent_slab); if(raw_inode_slab) kmem_cache_destroy(raw_inode_slab); if(tmp_dnode_info_slab) kmem_cache_destroy(tmp_dnode_info_slab); if(raw_node_ref_slab) kmem_cache_destroy(raw_node_ref_slab); if(node_frag_slab) kmem_cache_destroy(node_frag_slab); if(inode_cache_slab) kmem_cache_destroy(inode_cache_slab); #ifdef CONFIG_JFFS2_FS_XATTR if (xattr_datum_cache) kmem_cache_destroy(xattr_datum_cache); if (xattr_ref_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_XATTR struct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void) { struct jffs2_xattr_datum *xd; xd = kmem_cache_alloc(xattr_datum_cache, GFP_KERNEL); dbg_memalloc("%p\n", xd); memset(xd, 0, sizeof(struct jffs2_xattr_datum)); 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_alloc(xattr_ref_cache, GFP_KERNEL); dbg_memalloc("%p\n", ref); memset(ref, 0, sizeof(struct jffs2_xattr_ref)); 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