/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
- * Copyright (C) 2001-2003 Red Hat, Inc.
+ * Copyright © 2001-2007 Red Hat, Inc.
*
* Created by David Woodhouse <dwmw2@infradead.org>
*
* For licensing information, see the file 'LICENCE' in this directory.
*
- * $Id: nodelist.h,v 1.140 2005/09/07 08:34:54 havasi Exp $
- *
*/
#ifndef __JFFS2_NODELIST_H__
#define __JFFS2_NODELIST_H__
-#include <linux/config.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/jffs2.h>
#define cpu_to_je32(x) ((jint32_t){x})
#define cpu_to_jemode(x) ((jmode_t){os_to_jffs2_mode(x)})
+#define constant_cpu_to_je16(x) ((jint16_t){x})
+#define constant_cpu_to_je32(x) ((jint32_t){x})
+
#define je16_to_cpu(x) ((x).v16)
#define je32_to_cpu(x) ((x).v32)
#define jemode_to_cpu(x) (jffs2_to_os_mode((x).m))
#define cpu_to_je32(x) ((jint32_t){cpu_to_be32(x)})
#define cpu_to_jemode(x) ((jmode_t){cpu_to_be32(os_to_jffs2_mode(x))})
+#define constant_cpu_to_je16(x) ((jint16_t){__constant_cpu_to_be16(x)})
+#define constant_cpu_to_je32(x) ((jint32_t){__constant_cpu_to_be32(x)})
+
#define je16_to_cpu(x) (be16_to_cpu(x.v16))
#define je32_to_cpu(x) (be32_to_cpu(x.v32))
#define jemode_to_cpu(x) (be32_to_cpu(jffs2_to_os_mode((x).m)))
#define cpu_to_je32(x) ((jint32_t){cpu_to_le32(x)})
#define cpu_to_jemode(x) ((jmode_t){cpu_to_le32(os_to_jffs2_mode(x))})
+#define constant_cpu_to_je16(x) ((jint16_t){__constant_cpu_to_le16(x)})
+#define constant_cpu_to_je32(x) ((jint32_t){__constant_cpu_to_le32(x)})
+
#define je16_to_cpu(x) (le16_to_cpu(x.v16))
#define je32_to_cpu(x) (le32_to_cpu(x.v32))
#define jemode_to_cpu(x) (le32_to_cpu(jffs2_to_os_mode((x).m)))
struct jffs2_raw_node_ref
{
struct jffs2_raw_node_ref *next_in_ino; /* Points to the next raw_node_ref
- for this inode. If this is the last, it points to the inode_cache
- for this inode instead. The inode_cache will have NULL in the first
- word so you know when you've got there :) */
- struct jffs2_raw_node_ref *next_phys;
+ for this object. If this _is_ the last, it points to the inode_cache,
+ xattr_ref or xattr_datum instead. The common part of those structures
+ has NULL in the first word. See jffs2_raw_ref_to_ic() below */
uint32_t flash_offset;
+#undef TEST_TOTLEN
+#ifdef TEST_TOTLEN
uint32_t __totlen; /* This may die; use ref_totlen(c, jeb, ) below */
+#endif
};
- /* flash_offset & 3 always has to be zero, because nodes are
+#define REF_LINK_NODE ((int32_t)-1)
+#define REF_EMPTY_NODE ((int32_t)-2)
+
+/* Use blocks of about 256 bytes */
+#define REFS_PER_BLOCK ((255/sizeof(struct jffs2_raw_node_ref))-1)
+
+static inline struct jffs2_raw_node_ref *ref_next(struct jffs2_raw_node_ref *ref)
+{
+ ref++;
+
+ /* Link to another block of refs */
+ if (ref->flash_offset == REF_LINK_NODE) {
+ ref = ref->next_in_ino;
+ if (!ref)
+ return ref;
+ }
+
+ /* End of chain */
+ if (ref->flash_offset == REF_EMPTY_NODE)
+ return NULL;
+
+ return ref;
+}
+
+static inline struct jffs2_inode_cache *jffs2_raw_ref_to_ic(struct jffs2_raw_node_ref *raw)
+{
+ while(raw->next_in_ino)
+ raw = raw->next_in_ino;
+
+ /* NB. This can be a jffs2_xattr_datum or jffs2_xattr_ref and
+ not actually a jffs2_inode_cache. Check ->class */
+ return ((struct jffs2_inode_cache *)raw);
+}
+
+ /* flash_offset & 3 always has to be zero, because nodes are
always aligned at 4 bytes. So we have a couple of extra bits
to play with, which indicate the node's status; see below: */
#define REF_UNCHECKED 0 /* We haven't yet checked the CRC or built its inode */
#define ref_obsolete(ref) (((ref)->flash_offset & 3) == REF_OBSOLETE)
#define mark_ref_normal(ref) do { (ref)->flash_offset = ref_offset(ref) | REF_NORMAL; } while(0)
+/* Dirent nodes should be REF_PRISTINE only if they are not a deletion
+ dirent. Deletion dirents should be REF_NORMAL so that GC gets to
+ throw them away when appropriate */
+#define dirent_node_state(rd) ( (je32_to_cpu((rd)->ino)?REF_PRISTINE:REF_NORMAL) )
+
/* NB: REF_PRISTINE for an inode-less node (ref->next_in_ino == NULL) indicates
it is an unknown node of type JFFS2_NODETYPE_RWCOMPAT_COPY, so it'll get
copied. If you need to do anything different to GC inode-less nodes, then
a pointer to the first physical node which is part of this inode, too.
*/
struct jffs2_inode_cache {
+ /* First part of structure is shared with other objects which
+ can terminate the raw node refs' next_in_ino list -- which
+ currently struct jffs2_xattr_datum and struct jffs2_xattr_ref. */
+
struct jffs2_full_dirent *scan_dents; /* Used during scan to hold
temporary lists of dirents, and later must be set to
NULL to mark the end of the raw_node_ref->next_in_ino
chain. */
- u8 class; /* It's used for identification */
- u8 flags;
- uint16_t state;
- struct jffs2_inode_cache *next;
struct jffs2_raw_node_ref *nodes;
+ uint8_t class; /* It's used for identification */
+
+ /* end of shared structure */
+
+ uint8_t flags;
+ uint16_t state;
uint32_t ino;
- int nlink;
+ struct jffs2_inode_cache *next;
#ifdef CONFIG_JFFS2_FS_XATTR
struct jffs2_xattr_ref *xref;
#endif
+ uint32_t pino_nlink; /* Directories store parent inode
+ here; other inodes store nlink.
+ Zero always means that it's
+ completely unlinked. */
};
/* Inode states for 'state' above. We need the 'GC' state to prevent
#define INOCACHE_HASHSIZE 128
+#define write_ofs(c) ((c)->nextblock->offset + (c)->sector_size - (c)->nextblock->free_size)
+
/*
Larger representation of a raw node, kept in-core only when the
struct inode for this particular ino is instantiated.
uint32_t version;
uint32_t data_crc;
uint32_t partial_crc;
- uint32_t csize;
+ uint16_t csize;
+ uint16_t overlapped;
+};
+
+/* Temporary data structure used during readinode. */
+struct jffs2_readinode_info
+{
+ struct rb_root tn_root;
+ struct jffs2_tmp_dnode_info *mdata_tn;
+ uint32_t highest_version;
+ uint32_t latest_mctime;
+ uint32_t mctime_ver;
+ struct jffs2_full_dirent *fds;
+ struct jffs2_raw_node_ref *latest_ref;
};
struct jffs2_full_dirent
uint32_t wasted_size;
uint32_t free_size; /* Note that sector_size - free_size
is the address of the first free space */
+ uint32_t allocated_refs;
struct jffs2_raw_node_ref *first_node;
struct jffs2_raw_node_ref *last_node;
return ((c->flash_size / c->sector_size) * sizeof (struct jffs2_eraseblock)) > (128 * 1024);
}
-/* Calculate totlen from surrounding nodes or eraseblock */
-static inline uint32_t __ref_totlen(struct jffs2_sb_info *c,
- struct jffs2_eraseblock *jeb,
- struct jffs2_raw_node_ref *ref)
-{
- uint32_t ref_end;
-
- if (ref->next_phys)
- ref_end = ref_offset(ref->next_phys);
- else {
- if (!jeb)
- jeb = &c->blocks[ref->flash_offset / c->sector_size];
-
- /* Last node in block. Use free_space */
- BUG_ON(ref != jeb->last_node);
- ref_end = jeb->offset + c->sector_size - jeb->free_size;
- }
- return ref_end - ref_offset(ref);
-}
-
-static inline uint32_t ref_totlen(struct jffs2_sb_info *c,
- struct jffs2_eraseblock *jeb,
- struct jffs2_raw_node_ref *ref)
-{
- uint32_t ret;
-
-#if CONFIG_JFFS2_FS_DEBUG > 0
- if (jeb && jeb != &c->blocks[ref->flash_offset / c->sector_size]) {
- printk(KERN_CRIT "ref_totlen called with wrong block -- at 0x%08x instead of 0x%08x; ref 0x%08x\n",
- jeb->offset, c->blocks[ref->flash_offset / c->sector_size].offset, ref_offset(ref));
- BUG();
- }
-#endif
-
-#if 1
- ret = ref->__totlen;
-#else
- /* This doesn't actually work yet */
- ret = __ref_totlen(c, jeb, ref);
- if (ret != ref->__totlen) {
- printk(KERN_CRIT "Totlen for ref at %p (0x%08x-0x%08x) miscalculated as 0x%x instead of %x\n",
- ref, ref_offset(ref), ref_offset(ref)+ref->__totlen,
- ret, ref->__totlen);
- if (!jeb)
- jeb = &c->blocks[ref->flash_offset / c->sector_size];
- jffs2_dbg_dump_node_refs_nolock(c, jeb);
- BUG();
- }
-#endif
- return ret;
-}
+#define ref_totlen(a, b, c) __jffs2_ref_totlen((a), (b), (c))
#define ALLOC_NORMAL 0 /* Normal allocation */
#define ALLOC_DELETION 1 /* Deletion node. Best to allow it */
}
}
-static inline struct jffs2_inode_cache *jffs2_raw_ref_to_ic(struct jffs2_raw_node_ref *raw)
-{
- while(raw->next_in_ino) {
- raw = raw->next_in_ino;
- }
-
- return ((struct jffs2_inode_cache *)raw);
-}
-
static inline struct jffs2_node_frag *frag_first(struct rb_root *root)
{
- struct rb_node *node = root->rb_node;
+ struct rb_node *node = rb_first(root);
if (!node)
return NULL;
- while(node->rb_left)
- node = node->rb_left;
+
return rb_entry(node, struct jffs2_node_frag, rb);
}
static inline struct jffs2_node_frag *frag_last(struct rb_root *root)
{
- struct rb_node *node = root->rb_node;
+ struct rb_node *node = rb_last(root);
if (!node)
return NULL;
- while(node->rb_right)
- node = node->rb_right;
+
return rb_entry(node, struct jffs2_node_frag, rb);
}
-#define rb_parent(rb) ((rb)->rb_parent)
#define frag_next(frag) rb_entry(rb_next(&(frag)->rb), struct jffs2_node_frag, rb)
#define frag_prev(frag) rb_entry(rb_prev(&(frag)->rb), struct jffs2_node_frag, rb)
#define frag_parent(frag) rb_entry(rb_parent(&(frag)->rb), struct jffs2_node_frag, rb)
#define frag_right(frag) rb_entry((frag)->rb.rb_right, struct jffs2_node_frag, rb)
#define frag_erase(frag, list) rb_erase(&frag->rb, list);
+#define tn_next(tn) rb_entry(rb_next(&(tn)->rb), struct jffs2_tmp_dnode_info, rb)
+#define tn_prev(tn) rb_entry(rb_prev(&(tn)->rb), struct jffs2_tmp_dnode_info, rb)
+#define tn_parent(tn) rb_entry(rb_parent(&(tn)->rb), struct jffs2_tmp_dnode_info, rb)
+#define tn_left(tn) rb_entry((tn)->rb.rb_left, struct jffs2_tmp_dnode_info, rb)
+#define tn_right(tn) rb_entry((tn)->rb.rb_right, struct jffs2_tmp_dnode_info, rb)
+#define tn_erase(tn, list) rb_erase(&tn->rb, list);
+#define tn_last(list) rb_entry(rb_last(list), struct jffs2_tmp_dnode_info, rb)
+#define tn_first(list) rb_entry(rb_first(list), struct jffs2_tmp_dnode_info, rb)
+
/* nodelist.c */
void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list);
void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state);
void jffs2_free_raw_node_refs(struct jffs2_sb_info *c);
struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset);
void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c_delete);
-struct rb_node *rb_next(struct rb_node *);
-struct rb_node *rb_prev(struct rb_node *);
-void rb_replace_node(struct rb_node *victim, struct rb_node *new, struct rb_root *root);
-void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, struct jffs2_node_frag *this);
int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn);
-void jffs2_truncate_fragtree (struct jffs2_sb_info *c, struct rb_root *list, uint32_t size);
-int jffs2_add_older_frag_to_fragtree(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_tmp_dnode_info *tn);
-void jffs2_link_node_ref(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
- struct jffs2_raw_node_ref *ref, uint32_t len);
+uint32_t jffs2_truncate_fragtree (struct jffs2_sb_info *c, struct rb_root *list, uint32_t size);
+struct jffs2_raw_node_ref *jffs2_link_node_ref(struct jffs2_sb_info *c,
+ struct jffs2_eraseblock *jeb,
+ uint32_t ofs, uint32_t len,
+ struct jffs2_inode_cache *ic);
+extern uint32_t __jffs2_ref_totlen(struct jffs2_sb_info *c,
+ struct jffs2_eraseblock *jeb,
+ struct jffs2_raw_node_ref *ref);
/* nodemgmt.c */
int jffs2_thread_should_wake(struct jffs2_sb_info *c);
-int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, uint32_t *ofs,
+int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize,
uint32_t *len, int prio, uint32_t sumsize);
-int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize, uint32_t *ofs,
+int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize,
uint32_t *len, uint32_t sumsize);
-int jffs2_add_physical_node_ref(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *new);
+struct jffs2_raw_node_ref *jffs2_add_physical_node_ref(struct jffs2_sb_info *c,
+ uint32_t ofs, uint32_t len,
+ struct jffs2_inode_cache *ic);
void jffs2_complete_reservation(struct jffs2_sb_info *c);
void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *raw);
/* write.c */
int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, uint32_t mode, struct jffs2_raw_inode *ri);
-struct jffs2_full_dnode *jffs2_write_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_raw_inode *ri, const unsigned char *data, uint32_t datalen, uint32_t flash_ofs, int alloc_mode);
-struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_raw_dirent *rd, const unsigned char *name, uint32_t namelen, uint32_t flash_ofs, int alloc_mode);
+struct jffs2_full_dnode *jffs2_write_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
+ struct jffs2_raw_inode *ri, const unsigned char *data,
+ uint32_t datalen, int alloc_mode);
+struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
+ struct jffs2_raw_dirent *rd, const unsigned char *name,
+ uint32_t namelen, int alloc_mode);
int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
struct jffs2_raw_inode *ri, unsigned char *buf,
uint32_t offset, uint32_t writelen, uint32_t *retlen);
-int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, struct jffs2_inode_info *f, struct jffs2_raw_inode *ri, const char *name, int namelen);
-int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, const char *name, int namelen, struct jffs2_inode_info *dead_f, uint32_t time);
-int jffs2_do_link (struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino, uint8_t type, const char *name, int namelen, uint32_t time);
+int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, struct jffs2_inode_info *f,
+ struct jffs2_raw_inode *ri, const char *name, int namelen);
+int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, const char *name,
+ int namelen, struct jffs2_inode_info *dead_f, uint32_t time);
+int jffs2_do_link(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino,
+ uint8_t type, const char *name, int namelen, uint32_t time);
/* readinode.c */
void jffs2_free_raw_inode(struct jffs2_raw_inode *);
struct jffs2_tmp_dnode_info *jffs2_alloc_tmp_dnode_info(void);
void jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info *);
-struct jffs2_raw_node_ref *jffs2_alloc_raw_node_ref(void);
-void jffs2_free_raw_node_ref(struct jffs2_raw_node_ref *);
+int jffs2_prealloc_raw_node_refs(struct jffs2_sb_info *c,
+ struct jffs2_eraseblock *jeb, int nr);
+void jffs2_free_refblock(struct jffs2_raw_node_ref *);
struct jffs2_node_frag *jffs2_alloc_node_frag(void);
void jffs2_free_node_frag(struct jffs2_node_frag *);
struct jffs2_inode_cache *jffs2_alloc_inode_cache(void);
/* scan.c */
int jffs2_scan_medium(struct jffs2_sb_info *c);
void jffs2_rotate_lists(struct jffs2_sb_info *c);
-int jffs2_fill_scan_buf(struct jffs2_sb_info *c, void *buf,
- uint32_t ofs, uint32_t len);
struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino);
int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
+int jffs2_scan_dirty_space(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t size);
/* build.c */
int jffs2_do_mount_fs(struct jffs2_sb_info *c);
/* erase.c */
void jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count);
-void jffs2_free_all_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
+void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
/* wbuf.c */
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