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root/fs/jffs2/malloc.c

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DEFINITIONS

This source file includes following definitions.
  1. jffs2_create_slab_caches
  2. jffs2_destroy_slab_caches
  3. jffs2_alloc_full_dirent
  4. jffs2_free_full_dirent
  5. jffs2_alloc_full_dnode
  6. jffs2_free_full_dnode
  7. jffs2_alloc_raw_dirent
  8. jffs2_free_raw_dirent
  9. jffs2_alloc_raw_inode
  10. jffs2_free_raw_inode
  11. jffs2_alloc_tmp_dnode_info
  12. jffs2_free_tmp_dnode_info
  13. jffs2_alloc_refblock
  14. jffs2_prealloc_raw_node_refs
  15. jffs2_free_refblock
  16. jffs2_alloc_node_frag
  17. jffs2_free_node_frag
  18. jffs2_alloc_inode_cache
  19. jffs2_free_inode_cache
  20. jffs2_alloc_xattr_datum
  21. jffs2_free_xattr_datum
  22. jffs2_alloc_xattr_ref
  23. jffs2_free_xattr_ref

/*
 * 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

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