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315 lines
7.3 KiB
315 lines
7.3 KiB
/* |
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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 <[email protected]> |
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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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kmem_cache_destroy(full_dnode_slab); |
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kmem_cache_destroy(raw_dirent_slab); |
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kmem_cache_destroy(raw_inode_slab); |
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kmem_cache_destroy(tmp_dnode_info_slab); |
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kmem_cache_destroy(raw_node_ref_slab); |
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kmem_cache_destroy(node_frag_slab); |
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kmem_cache_destroy(inode_cache_slab); |
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#ifdef CONFIG_JFFS2_FS_XATTR |
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kmem_cache_destroy(xattr_datum_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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