2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright (C) 2001-2003 Red Hat, Inc.
6 * Created by David Woodhouse <dwmw2@infradead.org>
8 * For licensing information, see the file 'LICENCE' in this directory.
10 * $Id: nodelist.h,v 1.140 2005/09/07 08:34:54 havasi Exp $
14 #ifndef __JFFS2_NODELIST_H__
15 #define __JFFS2_NODELIST_H__
18 #include <linux/types.h>
19 #include <linux/jffs2.h>
20 #include "jffs2_fs_sb.h"
21 #include "jffs2_fs_i.h"
29 #include <linux/mtd/compatmac.h> /* For compatibility with older kernels */
33 #define JFFS2_NATIVE_ENDIAN
35 /* Note we handle mode bits conversion from JFFS2 (i.e. Linux) to/from
36 whatever OS we're actually running on here too. */
38 #if defined(JFFS2_NATIVE_ENDIAN)
39 #define cpu_to_je16(x) ((jint16_t){x})
40 #define cpu_to_je32(x) ((jint32_t){x})
41 #define cpu_to_jemode(x) ((jmode_t){os_to_jffs2_mode(x)})
43 #define constant_cpu_to_je16(x) ((jint16_t){x})
44 #define constant_cpu_to_je32(x) ((jint32_t){x})
46 #define je16_to_cpu(x) ((x).v16)
47 #define je32_to_cpu(x) ((x).v32)
48 #define jemode_to_cpu(x) (jffs2_to_os_mode((x).m))
49 #elif defined(JFFS2_BIG_ENDIAN)
50 #define cpu_to_je16(x) ((jint16_t){cpu_to_be16(x)})
51 #define cpu_to_je32(x) ((jint32_t){cpu_to_be32(x)})
52 #define cpu_to_jemode(x) ((jmode_t){cpu_to_be32(os_to_jffs2_mode(x))})
54 #define constant_cpu_to_je16(x) ((jint16_t){__constant_cpu_to_be16(x)})
55 #define constant_cpu_to_je32(x) ((jint32_t){__constant_cpu_to_be32(x)})
57 #define je16_to_cpu(x) (be16_to_cpu(x.v16))
58 #define je32_to_cpu(x) (be32_to_cpu(x.v32))
59 #define jemode_to_cpu(x) (be32_to_cpu(jffs2_to_os_mode((x).m)))
60 #elif defined(JFFS2_LITTLE_ENDIAN)
61 #define cpu_to_je16(x) ((jint16_t){cpu_to_le16(x)})
62 #define cpu_to_je32(x) ((jint32_t){cpu_to_le32(x)})
63 #define cpu_to_jemode(x) ((jmode_t){cpu_to_le32(os_to_jffs2_mode(x))})
65 #define constant_cpu_to_je16(x) ((jint16_t){__constant_cpu_to_le16(x)})
66 #define constant_cpu_to_je32(x) ((jint32_t){__constant_cpu_to_le32(x)})
68 #define je16_to_cpu(x) (le16_to_cpu(x.v16))
69 #define je32_to_cpu(x) (le32_to_cpu(x.v32))
70 #define jemode_to_cpu(x) (le32_to_cpu(jffs2_to_os_mode((x).m)))
75 /* The minimal node header size */
76 #define JFFS2_MIN_NODE_HEADER sizeof(struct jffs2_raw_dirent)
79 This is all we need to keep in-core for each raw node during normal
80 operation. As and when we do read_inode on a particular inode, we can
81 scan the nodes which are listed for it and build up a proper map of
82 which nodes are currently valid. JFFSv1 always used to keep that whole
83 map in core for each inode.
85 struct jffs2_raw_node_ref
87 struct jffs2_raw_node_ref *next_in_ino; /* Points to the next raw_node_ref
88 for this object. If this _is_ the last, it points to the inode_cache,
89 xattr_ref or xattr_datum instead. The common part of those structures
90 has NULL in the first word. See jffs2_raw_ref_to_ic() below */
91 uint32_t flash_offset;
94 uint32_t __totlen; /* This may die; use ref_totlen(c, jeb, ) below */
98 #define REF_LINK_NODE ((int32_t)-1)
99 #define REF_EMPTY_NODE ((int32_t)-2)
101 /* Use blocks of about 256 bytes */
102 #define REFS_PER_BLOCK ((255/sizeof(struct jffs2_raw_node_ref))-1)
104 static inline struct jffs2_raw_node_ref *ref_next(struct jffs2_raw_node_ref *ref)
108 /* Link to another block of refs */
109 if (ref->flash_offset == REF_LINK_NODE) {
110 ref = ref->next_in_ino;
116 if (ref->flash_offset == REF_EMPTY_NODE)
122 static inline struct jffs2_inode_cache *jffs2_raw_ref_to_ic(struct jffs2_raw_node_ref *raw)
124 while(raw->next_in_ino)
125 raw = raw->next_in_ino;
127 /* NB. This can be a jffs2_xattr_datum or jffs2_xattr_ref and
128 not actually a jffs2_inode_cache. Check ->class */
129 return ((struct jffs2_inode_cache *)raw);
132 /* flash_offset & 3 always has to be zero, because nodes are
133 always aligned at 4 bytes. So we have a couple of extra bits
134 to play with, which indicate the node's status; see below: */
135 #define REF_UNCHECKED 0 /* We haven't yet checked the CRC or built its inode */
136 #define REF_OBSOLETE 1 /* Obsolete, can be completely ignored */
137 #define REF_PRISTINE 2 /* Completely clean. GC without looking */
138 #define REF_NORMAL 3 /* Possibly overlapped. Read the page and write again on GC */
139 #define ref_flags(ref) ((ref)->flash_offset & 3)
140 #define ref_offset(ref) ((ref)->flash_offset & ~3)
141 #define ref_obsolete(ref) (((ref)->flash_offset & 3) == REF_OBSOLETE)
142 #define mark_ref_normal(ref) do { (ref)->flash_offset = ref_offset(ref) | REF_NORMAL; } while(0)
144 /* NB: REF_PRISTINE for an inode-less node (ref->next_in_ino == NULL) indicates
145 it is an unknown node of type JFFS2_NODETYPE_RWCOMPAT_COPY, so it'll get
146 copied. If you need to do anything different to GC inode-less nodes, then
147 you need to modify gc.c accordingly. */
149 /* For each inode in the filesystem, we need to keep a record of
150 nlink, because it would be a PITA to scan the whole directory tree
151 at read_inode() time to calculate it, and to keep sufficient information
152 in the raw_node_ref (basically both parent and child inode number for
153 dirent nodes) would take more space than this does. We also keep
154 a pointer to the first physical node which is part of this inode, too.
156 struct jffs2_inode_cache {
157 /* First part of structure is shared with other objects which
158 can terminate the raw node refs' next_in_ino list -- which
159 currently struct jffs2_xattr_datum and struct jffs2_xattr_ref. */
161 struct jffs2_full_dirent *scan_dents; /* Used during scan to hold
162 temporary lists of dirents, and later must be set to
163 NULL to mark the end of the raw_node_ref->next_in_ino
165 struct jffs2_raw_node_ref *nodes;
166 uint8_t class; /* It's used for identification */
168 /* end of shared structure */
173 struct jffs2_inode_cache *next;
174 #ifdef CONFIG_JFFS2_FS_XATTR
175 struct jffs2_xattr_ref *xref;
180 /* Inode states for 'state' above. We need the 'GC' state to prevent
181 someone from doing a read_inode() while we're moving a 'REF_PRISTINE'
182 node without going through all the iget() nonsense */
183 #define INO_STATE_UNCHECKED 0 /* CRC checks not yet done */
184 #define INO_STATE_CHECKING 1 /* CRC checks in progress */
185 #define INO_STATE_PRESENT 2 /* In core */
186 #define INO_STATE_CHECKEDABSENT 3 /* Checked, cleared again */
187 #define INO_STATE_GC 4 /* GCing a 'pristine' node */
188 #define INO_STATE_READING 5 /* In read_inode() */
189 #define INO_STATE_CLEARING 6 /* In clear_inode() */
191 #define INO_FLAGS_XATTR_CHECKED 0x01 /* has no duplicate xattr_ref */
193 #define RAWNODE_CLASS_INODE_CACHE 0
194 #define RAWNODE_CLASS_XATTR_DATUM 1
195 #define RAWNODE_CLASS_XATTR_REF 2
197 #define INOCACHE_HASHSIZE 128
199 #define write_ofs(c) ((c)->nextblock->offset + (c)->sector_size - (c)->nextblock->free_size)
202 Larger representation of a raw node, kept in-core only when the
203 struct inode for this particular ino is instantiated.
206 struct jffs2_full_dnode
208 struct jffs2_raw_node_ref *raw;
209 uint32_t ofs; /* The offset to which the data of this node belongs */
211 uint32_t frags; /* Number of fragments which currently refer
212 to this node. When this reaches zero,
213 the node is obsolete. */
217 Even larger representation of a raw node, kept in-core only while
218 we're actually building up the original map of which nodes go where,
221 struct jffs2_tmp_dnode_info
224 struct jffs2_full_dnode *fn;
227 uint32_t partial_crc;
231 struct jffs2_full_dirent
233 struct jffs2_raw_node_ref *raw;
234 struct jffs2_full_dirent *next;
236 uint32_t ino; /* == zero for unlink */
239 unsigned char name[0];
243 Fragments - used to build a map of which raw node to obtain
244 data from for each part of the ino
246 struct jffs2_node_frag
249 struct jffs2_full_dnode *node; /* NULL for holes */
251 uint32_t ofs; /* The offset to which this fragment belongs */
254 struct jffs2_eraseblock
256 struct list_head list;
258 uint32_t offset; /* of this block in the MTD */
260 uint32_t unchecked_size;
263 uint32_t wasted_size;
264 uint32_t free_size; /* Note that sector_size - free_size
265 is the address of the first free space */
266 uint32_t allocated_refs;
267 struct jffs2_raw_node_ref *first_node;
268 struct jffs2_raw_node_ref *last_node;
270 struct jffs2_raw_node_ref *gc_node; /* Next node to be garbage collected */
273 static inline int jffs2_blocks_use_vmalloc(struct jffs2_sb_info *c)
275 return ((c->flash_size / c->sector_size) * sizeof (struct jffs2_eraseblock)) > (128 * 1024);
278 #define ref_totlen(a, b, c) __jffs2_ref_totlen((a), (b), (c))
280 #define ALLOC_NORMAL 0 /* Normal allocation */
281 #define ALLOC_DELETION 1 /* Deletion node. Best to allow it */
282 #define ALLOC_GC 2 /* Space requested for GC. Give it or die */
283 #define ALLOC_NORETRY 3 /* For jffs2_write_dnode: On failure, return -EAGAIN instead of retrying */
285 /* How much dirty space before it goes on the very_dirty_list */
286 #define VERYDIRTY(c, size) ((size) >= ((c)->sector_size / 2))
288 /* check if dirty space is more than 255 Byte */
289 #define ISDIRTY(size) ((size) > sizeof (struct jffs2_raw_inode) + JFFS2_MIN_DATA_LEN)
291 #define PAD(x) (((x)+3)&~3)
293 static inline int jffs2_encode_dev(union jffs2_device_node *jdev, dev_t rdev)
295 if (old_valid_dev(rdev)) {
296 jdev->old = cpu_to_je16(old_encode_dev(rdev));
297 return sizeof(jdev->old);
299 jdev->new = cpu_to_je32(new_encode_dev(rdev));
300 return sizeof(jdev->new);
304 static inline struct jffs2_node_frag *frag_first(struct rb_root *root)
306 struct rb_node *node = rb_first(root);
311 return rb_entry(node, struct jffs2_node_frag, rb);
314 static inline struct jffs2_node_frag *frag_last(struct rb_root *root)
316 struct rb_node *node = rb_last(root);
321 return rb_entry(node, struct jffs2_node_frag, rb);
324 #define frag_next(frag) rb_entry(rb_next(&(frag)->rb), struct jffs2_node_frag, rb)
325 #define frag_prev(frag) rb_entry(rb_prev(&(frag)->rb), struct jffs2_node_frag, rb)
326 #define frag_parent(frag) rb_entry(rb_parent(&(frag)->rb), struct jffs2_node_frag, rb)
327 #define frag_left(frag) rb_entry((frag)->rb.rb_left, struct jffs2_node_frag, rb)
328 #define frag_right(frag) rb_entry((frag)->rb.rb_right, struct jffs2_node_frag, rb)
329 #define frag_erase(frag, list) rb_erase(&frag->rb, list);
332 void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list);
333 void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state);
334 struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t ino);
335 void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new);
336 void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old);
337 void jffs2_free_ino_caches(struct jffs2_sb_info *c);
338 void jffs2_free_raw_node_refs(struct jffs2_sb_info *c);
339 struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset);
340 void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c_delete);
341 struct rb_node *rb_next(struct rb_node *);
342 struct rb_node *rb_prev(struct rb_node *);
343 void rb_replace_node(struct rb_node *victim, struct rb_node *new, struct rb_root *root);
344 int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn);
345 void jffs2_truncate_fragtree (struct jffs2_sb_info *c, struct rb_root *list, uint32_t size);
346 int jffs2_add_older_frag_to_fragtree(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_tmp_dnode_info *tn);
347 struct jffs2_raw_node_ref *jffs2_link_node_ref(struct jffs2_sb_info *c,
348 struct jffs2_eraseblock *jeb,
349 uint32_t ofs, uint32_t len,
350 struct jffs2_inode_cache *ic);
351 extern uint32_t __jffs2_ref_totlen(struct jffs2_sb_info *c,
352 struct jffs2_eraseblock *jeb,
353 struct jffs2_raw_node_ref *ref);
356 int jffs2_thread_should_wake(struct jffs2_sb_info *c);
357 int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize,
358 uint32_t *len, int prio, uint32_t sumsize);
359 int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize,
360 uint32_t *len, uint32_t sumsize);
361 struct jffs2_raw_node_ref *jffs2_add_physical_node_ref(struct jffs2_sb_info *c,
362 uint32_t ofs, uint32_t len,
363 struct jffs2_inode_cache *ic);
364 void jffs2_complete_reservation(struct jffs2_sb_info *c);
365 void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *raw);
368 int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, uint32_t mode, struct jffs2_raw_inode *ri);
370 struct jffs2_full_dnode *jffs2_write_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
371 struct jffs2_raw_inode *ri, const unsigned char *data,
372 uint32_t datalen, int alloc_mode);
373 struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
374 struct jffs2_raw_dirent *rd, const unsigned char *name,
375 uint32_t namelen, int alloc_mode);
376 int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
377 struct jffs2_raw_inode *ri, unsigned char *buf,
378 uint32_t offset, uint32_t writelen, uint32_t *retlen);
379 int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, struct jffs2_inode_info *f,
380 struct jffs2_raw_inode *ri, const char *name, int namelen);
381 int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, const char *name,
382 int namelen, struct jffs2_inode_info *dead_f, uint32_t time);
383 int jffs2_do_link(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino,
384 uint8_t type, const char *name, int namelen, uint32_t time);
388 int jffs2_do_read_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
389 uint32_t ino, struct jffs2_raw_inode *latest_node);
390 int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
391 void jffs2_do_clear_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f);
394 int jffs2_create_slab_caches(void);
395 void jffs2_destroy_slab_caches(void);
397 struct jffs2_full_dirent *jffs2_alloc_full_dirent(int namesize);
398 void jffs2_free_full_dirent(struct jffs2_full_dirent *);
399 struct jffs2_full_dnode *jffs2_alloc_full_dnode(void);
400 void jffs2_free_full_dnode(struct jffs2_full_dnode *);
401 struct jffs2_raw_dirent *jffs2_alloc_raw_dirent(void);
402 void jffs2_free_raw_dirent(struct jffs2_raw_dirent *);
403 struct jffs2_raw_inode *jffs2_alloc_raw_inode(void);
404 void jffs2_free_raw_inode(struct jffs2_raw_inode *);
405 struct jffs2_tmp_dnode_info *jffs2_alloc_tmp_dnode_info(void);
406 void jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info *);
407 int jffs2_prealloc_raw_node_refs(struct jffs2_sb_info *c,
408 struct jffs2_eraseblock *jeb, int nr);
409 void jffs2_free_refblock(struct jffs2_raw_node_ref *);
410 struct jffs2_node_frag *jffs2_alloc_node_frag(void);
411 void jffs2_free_node_frag(struct jffs2_node_frag *);
412 struct jffs2_inode_cache *jffs2_alloc_inode_cache(void);
413 void jffs2_free_inode_cache(struct jffs2_inode_cache *);
414 #ifdef CONFIG_JFFS2_FS_XATTR
415 struct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void);
416 void jffs2_free_xattr_datum(struct jffs2_xattr_datum *);
417 struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void);
418 void jffs2_free_xattr_ref(struct jffs2_xattr_ref *);
422 int jffs2_garbage_collect_pass(struct jffs2_sb_info *c);
425 int jffs2_read_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
426 struct jffs2_full_dnode *fd, unsigned char *buf,
428 int jffs2_read_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
429 unsigned char *buf, uint32_t offset, uint32_t len);
430 char *jffs2_getlink(struct jffs2_sb_info *c, struct jffs2_inode_info *f);
433 int jffs2_scan_medium(struct jffs2_sb_info *c);
434 void jffs2_rotate_lists(struct jffs2_sb_info *c);
435 struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino);
436 int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
437 int jffs2_scan_dirty_space(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t size);
440 int jffs2_do_mount_fs(struct jffs2_sb_info *c);
443 void jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count);
444 void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
446 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
448 int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino);
449 int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c);
450 int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
451 int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
456 #endif /* __JFFS2_NODELIST_H__ */