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-rw-r--r--fs/jffs2/nodelist.h473
1 files changed, 473 insertions, 0 deletions
diff --git a/fs/jffs2/nodelist.h b/fs/jffs2/nodelist.h
new file mode 100644
index 000000000000..a4864d05ea92
--- /dev/null
+++ b/fs/jffs2/nodelist.h
@@ -0,0 +1,473 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright (C) 2001-2003 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@infradead.org>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ * $Id: nodelist.h,v 1.126 2004/11/19 15:06:29 dedekind 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>
+#include <linux/jffs2_fs_sb.h>
+#include <linux/jffs2_fs_i.h>
+
+#ifdef __ECOS
+#include "os-ecos.h"
+#else
+#include <linux/mtd/compatmac.h> /* For min/max in older kernels */
+#include "os-linux.h"
+#endif
+
+#ifndef CONFIG_JFFS2_FS_DEBUG
+#define CONFIG_JFFS2_FS_DEBUG 1
+#endif
+
+#if CONFIG_JFFS2_FS_DEBUG > 0
+#define D1(x) x
+#else
+#define D1(x)
+#endif
+
+#if CONFIG_JFFS2_FS_DEBUG > 1
+#define D2(x) x
+#else
+#define D2(x)
+#endif
+
+#define JFFS2_NATIVE_ENDIAN
+
+/* Note we handle mode bits conversion from JFFS2 (i.e. Linux) to/from
+ whatever OS we're actually running on here too. */
+
+#if defined(JFFS2_NATIVE_ENDIAN)
+#define cpu_to_je16(x) ((jint16_t){x})
+#define cpu_to_je32(x) ((jint32_t){x})
+#define cpu_to_jemode(x) ((jmode_t){os_to_jffs2_mode(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))
+#elif defined(JFFS2_BIG_ENDIAN)
+#define cpu_to_je16(x) ((jint16_t){cpu_to_be16(x)})
+#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 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)))
+#elif defined(JFFS2_LITTLE_ENDIAN)
+#define cpu_to_je16(x) ((jint16_t){cpu_to_le16(x)})
+#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 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)))
+#else
+#error wibble
+#endif
+
+/*
+ This is all we need to keep in-core for each raw node during normal
+ operation. As and when we do read_inode on a particular inode, we can
+ scan the nodes which are listed for it and build up a proper map of
+ which nodes are currently valid. JFFSv1 always used to keep that whole
+ map in core for each inode.
+*/
+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;
+ uint32_t flash_offset;
+ uint32_t __totlen; /* This may die; use ref_totlen(c, jeb, ) below */
+};
+
+ /* 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 1 /* Obsolete, can be completely ignored */
+#define REF_PRISTINE 2 /* Completely clean. GC without looking */
+#define REF_NORMAL 3 /* Possibly overlapped. Read the page and write again on GC */
+#define ref_flags(ref) ((ref)->flash_offset & 3)
+#define ref_offset(ref) ((ref)->flash_offset & ~3)
+#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)
+
+/* For each inode in the filesystem, we need to keep a record of
+ nlink, because it would be a PITA to scan the whole directory tree
+ at read_inode() time to calculate it, and to keep sufficient information
+ in the raw_node_ref (basically both parent and child inode number for
+ dirent nodes) would take more space than this does. We also keep
+ a pointer to the first physical node which is part of this inode, too.
+*/
+struct jffs2_inode_cache {
+ 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. */
+ struct jffs2_inode_cache *next;
+ struct jffs2_raw_node_ref *nodes;
+ uint32_t ino;
+ int nlink;
+ int state;
+};
+
+/* Inode states for 'state' above. We need the 'GC' state to prevent
+ someone from doing a read_inode() while we're moving a 'REF_PRISTINE'
+ node without going through all the iget() nonsense */
+#define INO_STATE_UNCHECKED 0 /* CRC checks not yet done */
+#define INO_STATE_CHECKING 1 /* CRC checks in progress */
+#define INO_STATE_PRESENT 2 /* In core */
+#define INO_STATE_CHECKEDABSENT 3 /* Checked, cleared again */
+#define INO_STATE_GC 4 /* GCing a 'pristine' node */
+#define INO_STATE_READING 5 /* In read_inode() */
+
+#define INOCACHE_HASHSIZE 128
+
+/*
+ Larger representation of a raw node, kept in-core only when the
+ struct inode for this particular ino is instantiated.
+*/
+
+struct jffs2_full_dnode
+{
+ struct jffs2_raw_node_ref *raw;
+ uint32_t ofs; /* The offset to which the data of this node belongs */
+ uint32_t size;
+ uint32_t frags; /* Number of fragments which currently refer
+ to this node. When this reaches zero,
+ the node is obsolete. */
+};
+
+/*
+ Even larger representation of a raw node, kept in-core only while
+ we're actually building up the original map of which nodes go where,
+ in read_inode()
+*/
+struct jffs2_tmp_dnode_info
+{
+ struct jffs2_tmp_dnode_info *next;
+ struct jffs2_full_dnode *fn;
+ uint32_t version;
+};
+
+struct jffs2_full_dirent
+{
+ struct jffs2_raw_node_ref *raw;
+ struct jffs2_full_dirent *next;
+ uint32_t version;
+ uint32_t ino; /* == zero for unlink */
+ unsigned int nhash;
+ unsigned char type;
+ unsigned char name[0];
+};
+
+/*
+ Fragments - used to build a map of which raw node to obtain
+ data from for each part of the ino
+*/
+struct jffs2_node_frag
+{
+ struct rb_node rb;
+ struct jffs2_full_dnode *node; /* NULL for holes */
+ uint32_t size;
+ uint32_t ofs; /* The offset to which this fragment belongs */
+};
+
+struct jffs2_eraseblock
+{
+ struct list_head list;
+ int bad_count;
+ uint32_t offset; /* of this block in the MTD */
+
+ uint32_t unchecked_size;
+ uint32_t used_size;
+ uint32_t dirty_size;
+ uint32_t wasted_size;
+ uint32_t free_size; /* Note that sector_size - free_size
+ is the address of the first free space */
+ struct jffs2_raw_node_ref *first_node;
+ struct jffs2_raw_node_ref *last_node;
+
+ struct jffs2_raw_node_ref *gc_node; /* Next node to be garbage collected */
+};
+
+#define ACCT_SANITY_CHECK(c, jeb) do { \
+ struct jffs2_eraseblock *___j = jeb; \
+ if ((___j) && ___j->used_size + ___j->dirty_size + ___j->free_size + ___j->wasted_size + ___j->unchecked_size != c->sector_size) { \
+ printk(KERN_NOTICE "Eeep. Space accounting for block at 0x%08x is screwed\n", ___j->offset); \
+ printk(KERN_NOTICE "free 0x%08x + dirty 0x%08x + used %08x + wasted %08x + unchecked %08x != total %08x\n", \
+ ___j->free_size, ___j->dirty_size, ___j->used_size, ___j->wasted_size, ___j->unchecked_size, c->sector_size); \
+ BUG(); \
+ } \
+ if (c->used_size + c->dirty_size + c->free_size + c->erasing_size + c->bad_size + c->wasted_size + c->unchecked_size != c->flash_size) { \
+ printk(KERN_NOTICE "Eeep. Space accounting superblock info is screwed\n"); \
+ printk(KERN_NOTICE "free 0x%08x + dirty 0x%08x + used %08x + erasing %08x + bad %08x + wasted %08x + unchecked %08x != total %08x\n", \
+ c->free_size, c->dirty_size, c->used_size, c->erasing_size, c->bad_size, c->wasted_size, c->unchecked_size, c->flash_size); \
+ BUG(); \
+ } \
+} while(0)
+
+static inline void paranoia_failed_dump(struct jffs2_eraseblock *jeb)
+{
+ struct jffs2_raw_node_ref *ref;
+ int i=0;
+
+ printk(KERN_NOTICE);
+ for (ref = jeb->first_node; ref; ref = ref->next_phys) {
+ printk("%08x->", ref_offset(ref));
+ if (++i == 8) {
+ i = 0;
+ printk("\n" KERN_NOTICE);
+ }
+ }
+ printk("\n");
+}
+
+
+#define ACCT_PARANOIA_CHECK(jeb) do { \
+ uint32_t my_used_size = 0; \
+ uint32_t my_unchecked_size = 0; \
+ struct jffs2_raw_node_ref *ref2 = jeb->first_node; \
+ while (ref2) { \
+ if (unlikely(ref2->flash_offset < jeb->offset || \
+ ref2->flash_offset > jeb->offset + c->sector_size)) { \
+ printk(KERN_NOTICE "Node %08x shouldn't be in block at %08x!\n", \
+ ref_offset(ref2), jeb->offset); \
+ paranoia_failed_dump(jeb); \
+ BUG(); \
+ } \
+ if (ref_flags(ref2) == REF_UNCHECKED) \
+ my_unchecked_size += ref_totlen(c, jeb, ref2); \
+ else if (!ref_obsolete(ref2)) \
+ my_used_size += ref_totlen(c, jeb, ref2); \
+ if (unlikely((!ref2->next_phys) != (ref2 == jeb->last_node))) { \
+ if (!ref2->next_phys) \
+ printk("ref for node at %p (phys %08x) has next_phys->%p (----), last_node->%p (phys %08x)\n", \
+ ref2, ref_offset(ref2), ref2->next_phys, \
+ jeb->last_node, ref_offset(jeb->last_node)); \
+ else \
+ printk("ref for node at %p (phys %08x) has next_phys->%p (%08x), last_node->%p (phys %08x)\n", \
+ ref2, ref_offset(ref2), ref2->next_phys, ref_offset(ref2->next_phys), \
+ jeb->last_node, ref_offset(jeb->last_node)); \
+ paranoia_failed_dump(jeb); \
+ BUG(); \
+ } \
+ ref2 = ref2->next_phys; \
+ } \
+ if (my_used_size != jeb->used_size) { \
+ printk(KERN_NOTICE "Calculated used size %08x != stored used size %08x\n", my_used_size, jeb->used_size); \
+ BUG(); \
+ } \
+ if (my_unchecked_size != jeb->unchecked_size) { \
+ printk(KERN_NOTICE "Calculated unchecked size %08x != stored unchecked size %08x\n", my_unchecked_size, jeb->unchecked_size); \
+ BUG(); \
+ } \
+ } while(0)
+
+/* 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;
+
+ D1(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();
+ })
+
+#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];
+ paranoia_failed_dump(jeb);
+ BUG();
+ }
+#endif
+ return ret;
+}
+
+
+#define ALLOC_NORMAL 0 /* Normal allocation */
+#define ALLOC_DELETION 1 /* Deletion node. Best to allow it */
+#define ALLOC_GC 2 /* Space requested for GC. Give it or die */
+#define ALLOC_NORETRY 3 /* For jffs2_write_dnode: On failure, return -EAGAIN instead of retrying */
+
+/* How much dirty space before it goes on the very_dirty_list */
+#define VERYDIRTY(c, size) ((size) >= ((c)->sector_size / 2))
+
+/* check if dirty space is more than 255 Byte */
+#define ISDIRTY(size) ((size) > sizeof (struct jffs2_raw_inode) + JFFS2_MIN_DATA_LEN)
+
+#define PAD(x) (((x)+3)&~3)
+
+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;
+
+ if (!node)
+ return NULL;
+ while(node->rb_left)
+ node = node->rb_left;
+ 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_left(frag) rb_entry((frag)->rb.rb_left, 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);
+
+/* nodelist.c */
+D2(void jffs2_print_frag_list(struct jffs2_inode_info *f));
+void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list);
+int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
+ struct jffs2_tmp_dnode_info **tnp, struct jffs2_full_dirent **fdp,
+ uint32_t *highest_version, uint32_t *latest_mctime,
+ uint32_t *mctime_ver);
+void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state);
+struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t ino);
+void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new);
+void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old);
+void jffs2_free_ino_caches(struct jffs2_sb_info *c);
+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);
+void jffs2_fragtree_insert(struct jffs2_node_frag *newfrag, struct jffs2_node_frag *base);
+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);
+
+/* 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, uint32_t *len, int prio);
+int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize, uint32_t *ofs, uint32_t *len);
+int jffs2_add_physical_node_ref(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *new);
+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);
+void jffs2_dump_block_lists(struct jffs2_sb_info *c);
+
+/* 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);
+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);
+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);
+
+
+/* readinode.c */
+void jffs2_truncate_fraglist (struct jffs2_sb_info *c, struct rb_root *list, uint32_t size);
+int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn);
+int jffs2_do_read_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
+ uint32_t ino, struct jffs2_raw_inode *latest_node);
+int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
+void jffs2_do_clear_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f);
+
+/* malloc.c */
+int jffs2_create_slab_caches(void);
+void jffs2_destroy_slab_caches(void);
+
+struct jffs2_full_dirent *jffs2_alloc_full_dirent(int namesize);
+void jffs2_free_full_dirent(struct jffs2_full_dirent *);
+struct jffs2_full_dnode *jffs2_alloc_full_dnode(void);
+void jffs2_free_full_dnode(struct jffs2_full_dnode *);
+struct jffs2_raw_dirent *jffs2_alloc_raw_dirent(void);
+void jffs2_free_raw_dirent(struct jffs2_raw_dirent *);
+struct jffs2_raw_inode *jffs2_alloc_raw_inode(void);
+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 *);
+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);
+void jffs2_free_inode_cache(struct jffs2_inode_cache *);
+
+/* gc.c */
+int jffs2_garbage_collect_pass(struct jffs2_sb_info *c);
+
+/* read.c */
+int jffs2_read_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
+ struct jffs2_full_dnode *fd, unsigned char *buf,
+ int ofs, int len);
+int jffs2_read_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
+ unsigned char *buf, uint32_t offset, uint32_t len);
+char *jffs2_getlink(struct jffs2_sb_info *c, struct jffs2_inode_info *f);
+
+/* scan.c */
+int jffs2_scan_medium(struct jffs2_sb_info *c);
+void jffs2_rotate_lists(struct jffs2_sb_info *c);
+
+/* 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);
+
+#ifdef CONFIG_JFFS2_FS_NAND
+/* wbuf.c */
+int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino);
+int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c);
+int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
+int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
+#endif
+
+#endif /* __JFFS2_NODELIST_H__ */
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-23 16:24:27 +0300