324 lines
7.5 KiB
C
324 lines
7.5 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright © 2001-2007 Red Hat, Inc.
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*
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* Created by David Woodhouse <dwmw2@infradead.org>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/jffs2.h>
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#include "nodelist.h"
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/* These are initialised to NULL in the kernel startup code.
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If you're porting to other operating systems, beware */
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static struct kmem_cache *full_dnode_slab;
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static struct kmem_cache *raw_dirent_slab;
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static struct kmem_cache *raw_inode_slab;
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static struct kmem_cache *tmp_dnode_info_slab;
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static struct kmem_cache *raw_node_ref_slab;
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static struct kmem_cache *node_frag_slab;
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static struct kmem_cache *inode_cache_slab;
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#ifdef CONFIG_JFFS2_FS_XATTR
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static struct kmem_cache *xattr_datum_cache;
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static struct kmem_cache *xattr_ref_cache;
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#endif
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int __init jffs2_create_slab_caches(void)
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{
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full_dnode_slab = kmem_cache_create("jffs2_full_dnode",
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sizeof(struct jffs2_full_dnode),
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0, 0, NULL);
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if (!full_dnode_slab)
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goto err;
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raw_dirent_slab = kmem_cache_create("jffs2_raw_dirent",
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sizeof(struct jffs2_raw_dirent),
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0, SLAB_HWCACHE_ALIGN, NULL);
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if (!raw_dirent_slab)
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goto err;
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raw_inode_slab = kmem_cache_create("jffs2_raw_inode",
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sizeof(struct jffs2_raw_inode),
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0, SLAB_HWCACHE_ALIGN, NULL);
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if (!raw_inode_slab)
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goto err;
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tmp_dnode_info_slab = kmem_cache_create("jffs2_tmp_dnode",
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sizeof(struct jffs2_tmp_dnode_info),
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0, 0, NULL);
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if (!tmp_dnode_info_slab)
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goto err;
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raw_node_ref_slab = kmem_cache_create("jffs2_refblock",
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sizeof(struct jffs2_raw_node_ref) * (REFS_PER_BLOCK + 1),
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0, 0, NULL);
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if (!raw_node_ref_slab)
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goto err;
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node_frag_slab = kmem_cache_create("jffs2_node_frag",
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sizeof(struct jffs2_node_frag),
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0, 0, NULL);
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if (!node_frag_slab)
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goto err;
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inode_cache_slab = kmem_cache_create("jffs2_inode_cache",
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sizeof(struct jffs2_inode_cache),
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0, 0, NULL);
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if (!inode_cache_slab)
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goto err;
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#ifdef CONFIG_JFFS2_FS_XATTR
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xattr_datum_cache = kmem_cache_create("jffs2_xattr_datum",
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sizeof(struct jffs2_xattr_datum),
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0, 0, NULL);
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if (!xattr_datum_cache)
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goto err;
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xattr_ref_cache = kmem_cache_create("jffs2_xattr_ref",
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sizeof(struct jffs2_xattr_ref),
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0, 0, NULL);
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if (!xattr_ref_cache)
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goto err;
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#endif
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return 0;
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err:
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jffs2_destroy_slab_caches();
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return -ENOMEM;
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}
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void jffs2_destroy_slab_caches(void)
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{
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if(full_dnode_slab)
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kmem_cache_destroy(full_dnode_slab);
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if(raw_dirent_slab)
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kmem_cache_destroy(raw_dirent_slab);
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if(raw_inode_slab)
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kmem_cache_destroy(raw_inode_slab);
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if(tmp_dnode_info_slab)
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kmem_cache_destroy(tmp_dnode_info_slab);
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if(raw_node_ref_slab)
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kmem_cache_destroy(raw_node_ref_slab);
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if(node_frag_slab)
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kmem_cache_destroy(node_frag_slab);
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if(inode_cache_slab)
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kmem_cache_destroy(inode_cache_slab);
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#ifdef CONFIG_JFFS2_FS_XATTR
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if (xattr_datum_cache)
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kmem_cache_destroy(xattr_datum_cache);
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if (xattr_ref_cache)
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kmem_cache_destroy(xattr_ref_cache);
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#endif
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}
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struct jffs2_full_dirent *jffs2_alloc_full_dirent(int namesize)
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{
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struct jffs2_full_dirent *ret;
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ret = kmalloc(sizeof(struct jffs2_full_dirent) + namesize, GFP_KERNEL);
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dbg_memalloc("%p\n", ret);
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return ret;
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}
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void jffs2_free_full_dirent(struct jffs2_full_dirent *x)
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{
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dbg_memalloc("%p\n", x);
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kfree(x);
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}
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struct jffs2_full_dnode *jffs2_alloc_full_dnode(void)
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{
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struct jffs2_full_dnode *ret;
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ret = kmem_cache_alloc(full_dnode_slab, GFP_KERNEL);
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dbg_memalloc("%p\n", ret);
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return ret;
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}
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void jffs2_free_full_dnode(struct jffs2_full_dnode *x)
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{
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dbg_memalloc("%p\n", x);
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kmem_cache_free(full_dnode_slab, x);
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}
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struct jffs2_raw_dirent *jffs2_alloc_raw_dirent(void)
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{
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struct jffs2_raw_dirent *ret;
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ret = kmem_cache_alloc(raw_dirent_slab, GFP_KERNEL);
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dbg_memalloc("%p\n", ret);
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return ret;
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}
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void jffs2_free_raw_dirent(struct jffs2_raw_dirent *x)
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{
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dbg_memalloc("%p\n", x);
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kmem_cache_free(raw_dirent_slab, x);
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}
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struct jffs2_raw_inode *jffs2_alloc_raw_inode(void)
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{
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struct jffs2_raw_inode *ret;
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ret = kmem_cache_alloc(raw_inode_slab, GFP_KERNEL);
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dbg_memalloc("%p\n", ret);
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return ret;
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}
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void jffs2_free_raw_inode(struct jffs2_raw_inode *x)
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{
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dbg_memalloc("%p\n", x);
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kmem_cache_free(raw_inode_slab, x);
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}
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struct jffs2_tmp_dnode_info *jffs2_alloc_tmp_dnode_info(void)
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{
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struct jffs2_tmp_dnode_info *ret;
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ret = kmem_cache_alloc(tmp_dnode_info_slab, GFP_KERNEL);
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dbg_memalloc("%p\n",
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ret);
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return ret;
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}
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void jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info *x)
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{
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dbg_memalloc("%p\n", x);
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kmem_cache_free(tmp_dnode_info_slab, x);
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}
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static struct jffs2_raw_node_ref *jffs2_alloc_refblock(void)
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{
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struct jffs2_raw_node_ref *ret;
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ret = kmem_cache_alloc(raw_node_ref_slab, GFP_KERNEL);
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if (ret) {
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int i = 0;
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for (i=0; i < REFS_PER_BLOCK; i++) {
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ret[i].flash_offset = REF_EMPTY_NODE;
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ret[i].next_in_ino = NULL;
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}
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ret[i].flash_offset = REF_LINK_NODE;
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ret[i].next_in_ino = NULL;
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}
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return ret;
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}
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int jffs2_prealloc_raw_node_refs(struct jffs2_sb_info *c,
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struct jffs2_eraseblock *jeb, int nr)
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{
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struct jffs2_raw_node_ref **p, *ref;
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int i = nr;
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dbg_memalloc("%d\n", nr);
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p = &jeb->last_node;
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ref = *p;
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dbg_memalloc("Reserving %d refs for block @0x%08x\n", nr, jeb->offset);
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/* If jeb->last_node is really a valid node then skip over it */
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if (ref && ref->flash_offset != REF_EMPTY_NODE)
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ref++;
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while (i) {
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if (!ref) {
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dbg_memalloc("Allocating new refblock linked from %p\n", p);
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ref = *p = jffs2_alloc_refblock();
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if (!ref)
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return -ENOMEM;
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}
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if (ref->flash_offset == REF_LINK_NODE) {
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p = &ref->next_in_ino;
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ref = *p;
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continue;
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}
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i--;
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ref++;
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}
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jeb->allocated_refs = nr;
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dbg_memalloc("Reserved %d refs for block @0x%08x, last_node is %p (%08x,%p)\n",
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nr, jeb->offset, jeb->last_node, jeb->last_node->flash_offset,
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jeb->last_node->next_in_ino);
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return 0;
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}
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void jffs2_free_refblock(struct jffs2_raw_node_ref *x)
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{
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dbg_memalloc("%p\n", x);
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kmem_cache_free(raw_node_ref_slab, x);
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}
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struct jffs2_node_frag *jffs2_alloc_node_frag(void)
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{
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struct jffs2_node_frag *ret;
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ret = kmem_cache_alloc(node_frag_slab, GFP_KERNEL);
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dbg_memalloc("%p\n", ret);
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return ret;
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}
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void jffs2_free_node_frag(struct jffs2_node_frag *x)
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{
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dbg_memalloc("%p\n", x);
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kmem_cache_free(node_frag_slab, x);
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}
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struct jffs2_inode_cache *jffs2_alloc_inode_cache(void)
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{
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struct jffs2_inode_cache *ret;
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ret = kmem_cache_alloc(inode_cache_slab, GFP_KERNEL);
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dbg_memalloc("%p\n", ret);
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return ret;
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}
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void jffs2_free_inode_cache(struct jffs2_inode_cache *x)
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{
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dbg_memalloc("%p\n", x);
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kmem_cache_free(inode_cache_slab, x);
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}
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#ifdef CONFIG_JFFS2_FS_XATTR
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struct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void)
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{
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struct jffs2_xattr_datum *xd;
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xd = kmem_cache_zalloc(xattr_datum_cache, GFP_KERNEL);
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dbg_memalloc("%p\n", xd);
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if (!xd)
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return NULL;
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xd->class = RAWNODE_CLASS_XATTR_DATUM;
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xd->node = (void *)xd;
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INIT_LIST_HEAD(&xd->xindex);
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return xd;
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}
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void jffs2_free_xattr_datum(struct jffs2_xattr_datum *xd)
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{
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dbg_memalloc("%p\n", xd);
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kmem_cache_free(xattr_datum_cache, xd);
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}
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struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void)
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{
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struct jffs2_xattr_ref *ref;
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ref = kmem_cache_zalloc(xattr_ref_cache, GFP_KERNEL);
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dbg_memalloc("%p\n", ref);
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if (!ref)
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return NULL;
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ref->class = RAWNODE_CLASS_XATTR_REF;
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ref->node = (void *)ref;
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return ref;
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}
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void jffs2_free_xattr_ref(struct jffs2_xattr_ref *ref)
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{
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dbg_memalloc("%p\n", ref);
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kmem_cache_free(xattr_ref_cache, ref);
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}
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#endif
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