malloc.c

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/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2001-2007 Red Hat, Inc.
 *
 * Created by David Woodhouse <[email protected]>
 *
 * 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_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, SLAB_HWCACHE_ALIGN, NULL);
    if (!raw_dirent_slab)
        goto err;

    raw_inode_slab = kmem_cache_create("jffs2_raw_inode",
                       sizeof(struct jffs2_raw_inode),
                       0, SLAB_HWCACHE_ALIGN, 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_zalloc(xattr_datum_cache, GFP_KERNEL);
    dbg_memalloc("%p\n", xd);

    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);

    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