root/fs/jffs2/nodelist.h

INCLUDED FROM

DEFINITIONS

1. jffs2_raw_ref_to_ic
2. jffs2_blocks_use_vmalloc
3. jffs2_encode_dev
4. frag_first
5. frag_last

   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright © 2001-2007 Red Hat, Inc.
   5  *
   6  * Created by David Woodhouse <dwmw2@infradead.org>
   7  *
   8  * For licensing information, see the file 'LICENCE' in this directory.
   9  *
  10  */
  11 
  12 #ifndef __JFFS2_NODELIST_H__
  13 #define __JFFS2_NODELIST_H__
  14 
  15 #include <linux/fs.h>
  16 #include <linux/types.h>
  17 #include <linux/jffs2.h>
  18 #include "jffs2_fs_sb.h"
  19 #include "jffs2_fs_i.h"
  20 #include "xattr.h"
  21 #include "acl.h"
  22 #include "summary.h"
  23 
  24 #ifdef __ECOS
  25 #include "os-ecos.h"
  26 #else
  27 #include "os-linux.h"
  28 #endif
  29 
  30 #define JFFS2_NATIVE_ENDIAN
  31 
  32 /* Note we handle mode bits conversion from JFFS2 (i.e. Linux) to/from
  33    whatever OS we're actually running on here too. */
  34 
  35 #if defined(JFFS2_NATIVE_ENDIAN)
  36 #define cpu_to_je16(x) ((jint16_t){x})
  37 #define cpu_to_je32(x) ((jint32_t){x})
  38 #define cpu_to_jemode(x) ((jmode_t){os_to_jffs2_mode(x)})
  39 
  40 #define constant_cpu_to_je16(x) ((jint16_t){x})
  41 #define constant_cpu_to_je32(x) ((jint32_t){x})
  42 
  43 #define je16_to_cpu(x) ((x).v16)
  44 #define je32_to_cpu(x) ((x).v32)
  45 #define jemode_to_cpu(x) (jffs2_to_os_mode((x).m))
  46 #elif defined(JFFS2_BIG_ENDIAN)
  47 #define cpu_to_je16(x) ((jint16_t){cpu_to_be16(x)})
  48 #define cpu_to_je32(x) ((jint32_t){cpu_to_be32(x)})
  49 #define cpu_to_jemode(x) ((jmode_t){cpu_to_be32(os_to_jffs2_mode(x))})
  50 
  51 #define constant_cpu_to_je16(x) ((jint16_t){__constant_cpu_to_be16(x)})
  52 #define constant_cpu_to_je32(x) ((jint32_t){__constant_cpu_to_be32(x)})
  53 
  54 #define je16_to_cpu(x) (be16_to_cpu(x.v16))
  55 #define je32_to_cpu(x) (be32_to_cpu(x.v32))
  56 #define jemode_to_cpu(x) (be32_to_cpu(jffs2_to_os_mode((x).m)))
  57 #elif defined(JFFS2_LITTLE_ENDIAN)
  58 #define cpu_to_je16(x) ((jint16_t){cpu_to_le16(x)})
  59 #define cpu_to_je32(x) ((jint32_t){cpu_to_le32(x)})
  60 #define cpu_to_jemode(x) ((jmode_t){cpu_to_le32(os_to_jffs2_mode(x))})
  61 
  62 #define constant_cpu_to_je16(x) ((jint16_t){__constant_cpu_to_le16(x)})
  63 #define constant_cpu_to_je32(x) ((jint32_t){__constant_cpu_to_le32(x)})
  64 
  65 #define je16_to_cpu(x) (le16_to_cpu(x.v16))
  66 #define je32_to_cpu(x) (le32_to_cpu(x.v32))
  67 #define jemode_to_cpu(x) (le32_to_cpu(jffs2_to_os_mode((x).m)))
  68 #else
  69 #error wibble
  70 #endif
  71 
  72 /* The minimal node header size */
  73 #define JFFS2_MIN_NODE_HEADER sizeof(struct jffs2_raw_dirent)
  74 
  75 /*
  76   This is all we need to keep in-core for each raw node during normal
  77   operation. As and when we do read_inode on a particular inode, we can
  78   scan the nodes which are listed for it and build up a proper map of
  79   which nodes are currently valid. JFFSv1 always used to keep that whole
  80   map in core for each inode.
  81 */
  82 struct jffs2_raw_node_ref
  83 {
  84         struct jffs2_raw_node_ref *next_in_ino; /* Points to the next raw_node_ref
  85                 for this object. If this _is_ the last, it points to the inode_cache,
  86                 xattr_ref or xattr_datum instead. The common part of those structures
  87                 has NULL in the first word. See jffs2_raw_ref_to_ic() below */
  88         uint32_t flash_offset;
  89 #undef TEST_TOTLEN
  90 #ifdef TEST_TOTLEN
  91         uint32_t __totlen; /* This may die; use ref_totlen(c, jeb, ) below */
  92 #endif
  93 };
  94 
  95 #define REF_LINK_NODE ((int32_t)-1)
  96 #define REF_EMPTY_NODE ((int32_t)-2)
  97 
  98 /* Use blocks of about 256 bytes */
  99 #define REFS_PER_BLOCK ((255/sizeof(struct jffs2_raw_node_ref))-1)
 100 
 101 static inline struct jffs2_raw_node_ref *ref_next(struct jffs2_raw_node_ref *ref)
 102 {
 103         ref++;
 104 
 105         /* Link to another block of refs */
 106         if (ref->flash_offset == REF_LINK_NODE) {
 107                 ref = ref->next_in_ino;
 108                 if (!ref)
 109                         return ref;
 110         }
 111 
 112         /* End of chain */
 113         if (ref->flash_offset == REF_EMPTY_NODE)
 114                 return NULL;
 115 
 116         return ref;
 117 }
 118 
 119 static inline struct jffs2_inode_cache *jffs2_raw_ref_to_ic(struct jffs2_raw_node_ref *raw)
 120 {
 121         while(raw->next_in_ino)
 122                 raw = raw->next_in_ino;
 123 
 124         /* NB. This can be a jffs2_xattr_datum or jffs2_xattr_ref and
 125            not actually a jffs2_inode_cache. Check ->class */
 126         return ((struct jffs2_inode_cache *)raw);
 127 }
 128 
 129         /* flash_offset & 3 always has to be zero, because nodes are
 130            always aligned at 4 bytes. So we have a couple of extra bits
 131            to play with, which indicate the node's status; see below: */
 132 #define REF_UNCHECKED   0       /* We haven't yet checked the CRC or built its inode */
 133 #define REF_OBSOLETE    1       /* Obsolete, can be completely ignored */
 134 #define REF_PRISTINE    2       /* Completely clean. GC without looking */
 135 #define REF_NORMAL      3       /* Possibly overlapped. Read the page and write again on GC */
 136 #define ref_flags(ref)          ((ref)->flash_offset & 3)
 137 #define ref_offset(ref)         ((ref)->flash_offset & ~3)
 138 #define ref_obsolete(ref)       (((ref)->flash_offset & 3) == REF_OBSOLETE)
 139 #define mark_ref_normal(ref)    do { (ref)->flash_offset = ref_offset(ref) | REF_NORMAL; } while(0)
 140 
 141 /* Dirent nodes should be REF_PRISTINE only if they are not a deletion
 142    dirent. Deletion dirents should be REF_NORMAL so that GC gets to
 143    throw them away when appropriate */
 144 #define dirent_node_state(rd)   ( (je32_to_cpu((rd)->ino)?REF_PRISTINE:REF_NORMAL) )
 145 
 146 /* NB: REF_PRISTINE for an inode-less node (ref->next_in_ino == NULL) indicates
 147    it is an unknown node of type JFFS2_NODETYPE_RWCOMPAT_COPY, so it'll get
 148    copied. If you need to do anything different to GC inode-less nodes, then
 149    you need to modify gc.c accordingly. */
 150 
 151 /* For each inode in the filesystem, we need to keep a record of
 152    nlink, because it would be a PITA to scan the whole directory tree
 153    at read_inode() time to calculate it, and to keep sufficient information
 154    in the raw_node_ref (basically both parent and child inode number for
 155    dirent nodes) would take more space than this does. We also keep
 156    a pointer to the first physical node which is part of this inode, too.
 157 */
 158 struct jffs2_inode_cache {
 159         /* First part of structure is shared with other objects which
 160            can terminate the raw node refs' next_in_ino list -- which
 161            currently struct jffs2_xattr_datum and struct jffs2_xattr_ref. */
 162 
 163         struct jffs2_full_dirent *scan_dents; /* Used during scan to hold
 164                 temporary lists of dirents, and later must be set to
 165                 NULL to mark the end of the raw_node_ref->next_in_ino
 166                 chain. */
 167         struct jffs2_raw_node_ref *nodes;
 168         uint8_t class;  /* It's used for identification */
 169 
 170         /* end of shared structure */
 171 
 172         uint8_t flags;
 173         uint16_t state;
 174         uint32_t ino;
 175         struct jffs2_inode_cache *next;
 176 #ifdef CONFIG_JFFS2_FS_XATTR
 177         struct jffs2_xattr_ref *xref;
 178 #endif
 179         uint32_t pino_nlink;    /* Directories store parent inode
 180                                    here; other inodes store nlink.
 181                                    Zero always means that it's
 182                                    completely unlinked. */
 183 };
 184 
 185 /* Inode states for 'state' above. We need the 'GC' state to prevent
 186    someone from doing a read_inode() while we're moving a 'REF_PRISTINE'
 187    node without going through all the iget() nonsense */
 188 #define INO_STATE_UNCHECKED     0       /* CRC checks not yet done */
 189 #define INO_STATE_CHECKING      1       /* CRC checks in progress */
 190 #define INO_STATE_PRESENT       2       /* In core */
 191 #define INO_STATE_CHECKEDABSENT 3       /* Checked, cleared again */
 192 #define INO_STATE_GC            4       /* GCing a 'pristine' node */
 193 #define INO_STATE_READING       5       /* In read_inode() */
 194 #define INO_STATE_CLEARING      6       /* In clear_inode() */
 195 
 196 #define INO_FLAGS_XATTR_CHECKED 0x01    /* has no duplicate xattr_ref */
 197 #define INO_FLAGS_IS_DIR        0x02    /* is a directory */
 198 
 199 #define RAWNODE_CLASS_INODE_CACHE       0
 200 #define RAWNODE_CLASS_XATTR_DATUM       1
 201 #define RAWNODE_CLASS_XATTR_REF         2
 202 
 203 #define INOCACHE_HASHSIZE_MIN 128
 204 #define INOCACHE_HASHSIZE_MAX 1024
 205 
 206 #define write_ofs(c) ((c)->nextblock->offset + (c)->sector_size - (c)->nextblock->free_size)
 207 
 208 /*
 209   Larger representation of a raw node, kept in-core only when the
 210   struct inode for this particular ino is instantiated.
 211 */
 212 
 213 struct jffs2_full_dnode
 214 {
 215         struct jffs2_raw_node_ref *raw;
 216         uint32_t ofs; /* The offset to which the data of this node belongs */
 217         uint32_t size;
 218         uint32_t frags; /* Number of fragments which currently refer
 219                         to this node. When this reaches zero,
 220                         the node is obsolete.  */
 221 };
 222 
 223 /*
 224    Even larger representation of a raw node, kept in-core only while
 225    we're actually building up the original map of which nodes go where,
 226    in read_inode()
 227 */
 228 struct jffs2_tmp_dnode_info
 229 {
 230         struct rb_node rb;
 231         struct jffs2_full_dnode *fn;
 232         uint32_t version;
 233         uint32_t data_crc;
 234         uint32_t partial_crc;
 235         uint32_t csize;
 236         uint16_t overlapped;
 237 };
 238 
 239 /* Temporary data structure used during readinode. */
 240 struct jffs2_readinode_info
 241 {
 242         struct rb_root tn_root;
 243         struct jffs2_tmp_dnode_info *mdata_tn;
 244         uint32_t highest_version;
 245         uint32_t latest_mctime;
 246         uint32_t mctime_ver;
 247         struct jffs2_full_dirent *fds;
 248         struct jffs2_raw_node_ref *latest_ref;
 249 };
 250 
 251 struct jffs2_full_dirent
 252 {
 253         union {
 254                 struct jffs2_raw_node_ref *raw;
 255                 struct jffs2_inode_cache *ic; /* Just during part of build */
 256         };
 257         struct jffs2_full_dirent *next;
 258         uint32_t version;
 259         uint32_t ino; /* == zero for unlink */
 260         unsigned int nhash;
 261         unsigned char type;
 262         unsigned char name[0];
 263 };
 264 
 265 /*
 266   Fragments - used to build a map of which raw node to obtain
 267   data from for each part of the ino
 268 */
 269 struct jffs2_node_frag
 270 {
 271         struct rb_node rb;
 272         struct jffs2_full_dnode *node; /* NULL for holes */
 273         uint32_t size;
 274         uint32_t ofs; /* The offset to which this fragment belongs */
 275 };
 276 
 277 struct jffs2_eraseblock
 278 {
 279         struct list_head list;
 280         int bad_count;
 281         uint32_t offset;                /* of this block in the MTD */
 282 
 283         uint32_t unchecked_size;
 284         uint32_t used_size;
 285         uint32_t dirty_size;
 286         uint32_t wasted_size;
 287         uint32_t free_size;     /* Note that sector_size - free_size
 288                                    is the address of the first free space */
 289         uint32_t allocated_refs;
 290         struct jffs2_raw_node_ref *first_node;
 291         struct jffs2_raw_node_ref *last_node;
 292 
 293         struct jffs2_raw_node_ref *gc_node;     /* Next node to be garbage collected */
 294 };
 295 
 296 static inline int jffs2_blocks_use_vmalloc(struct jffs2_sb_info *c)
 297 {
 298         return ((c->flash_size / c->sector_size) * sizeof (struct jffs2_eraseblock)) > (128 * 1024);
 299 }
 300 
 301 #define ref_totlen(a, b, c) __jffs2_ref_totlen((a), (b), (c))
 302 
 303 #define ALLOC_NORMAL    0       /* Normal allocation */
 304 #define ALLOC_DELETION  1       /* Deletion node. Best to allow it */
 305 #define ALLOC_GC        2       /* Space requested for GC. Give it or die */
 306 #define ALLOC_NORETRY   3       /* For jffs2_write_dnode: On failure, return -EAGAIN instead of retrying */
 307 
 308 /* How much dirty space before it goes on the very_dirty_list */
 309 #define VERYDIRTY(c, size) ((size) >= ((c)->sector_size / 2))
 310 
 311 /* check if dirty space is more than 255 Byte */
 312 #define ISDIRTY(size) ((size) >  sizeof (struct jffs2_raw_inode) + JFFS2_MIN_DATA_LEN)
 313 
 314 #define PAD(x) (((x)+3)&~3)
 315 
 316 static inline int jffs2_encode_dev(union jffs2_device_node *jdev, dev_t rdev)
 317 {
 318         if (old_valid_dev(rdev)) {
 319                 jdev->old_id = cpu_to_je16(old_encode_dev(rdev));
 320                 return sizeof(jdev->old_id);
 321         } else {
 322                 jdev->new_id = cpu_to_je32(new_encode_dev(rdev));
 323                 return sizeof(jdev->new_id);
 324         }
 325 }
 326 
 327 static inline struct jffs2_node_frag *frag_first(struct rb_root *root)
 328 {
 329         struct rb_node *node = rb_first(root);
 330 
 331         if (!node)
 332                 return NULL;
 333 
 334         return rb_entry(node, struct jffs2_node_frag, rb);
 335 }
 336 
 337 static inline struct jffs2_node_frag *frag_last(struct rb_root *root)
 338 {
 339         struct rb_node *node = rb_last(root);
 340 
 341         if (!node)
 342                 return NULL;
 343 
 344         return rb_entry(node, struct jffs2_node_frag, rb);
 345 }
 346 
 347 #define frag_next(frag) rb_entry(rb_next(&(frag)->rb), struct jffs2_node_frag, rb)
 348 #define frag_prev(frag) rb_entry(rb_prev(&(frag)->rb), struct jffs2_node_frag, rb)
 349 #define frag_parent(frag) rb_entry(rb_parent(&(frag)->rb), struct jffs2_node_frag, rb)
 350 #define frag_left(frag) rb_entry((frag)->rb.rb_left, struct jffs2_node_frag, rb)
 351 #define frag_right(frag) rb_entry((frag)->rb.rb_right, struct jffs2_node_frag, rb)
 352 #define frag_erase(frag, list) rb_erase(&frag->rb, list);
 353 
 354 #define tn_next(tn) rb_entry(rb_next(&(tn)->rb), struct jffs2_tmp_dnode_info, rb)
 355 #define tn_prev(tn) rb_entry(rb_prev(&(tn)->rb), struct jffs2_tmp_dnode_info, rb)
 356 #define tn_parent(tn) rb_entry(rb_parent(&(tn)->rb), struct jffs2_tmp_dnode_info, rb)
 357 #define tn_left(tn) rb_entry((tn)->rb.rb_left, struct jffs2_tmp_dnode_info, rb)
 358 #define tn_right(tn) rb_entry((tn)->rb.rb_right, struct jffs2_tmp_dnode_info, rb)
 359 #define tn_erase(tn, list) rb_erase(&tn->rb, list);
 360 #define tn_last(list) rb_entry(rb_last(list), struct jffs2_tmp_dnode_info, rb)
 361 #define tn_first(list) rb_entry(rb_first(list), struct jffs2_tmp_dnode_info, rb)
 362 
 363 /* nodelist.c */
 364 void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list);
 365 void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state);
 366 struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t ino);
 367 void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new);
 368 void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old);
 369 void jffs2_free_ino_caches(struct jffs2_sb_info *c);
 370 void jffs2_free_raw_node_refs(struct jffs2_sb_info *c);
 371 struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset);
 372 void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c_delete);
 373 int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn);
 374 uint32_t jffs2_truncate_fragtree (struct jffs2_sb_info *c, struct rb_root *list, uint32_t size);
 375 struct jffs2_raw_node_ref *jffs2_link_node_ref(struct jffs2_sb_info *c,
 376                                                struct jffs2_eraseblock *jeb,
 377                                                uint32_t ofs, uint32_t len,
 378                                                struct jffs2_inode_cache *ic);
 379 extern uint32_t __jffs2_ref_totlen(struct jffs2_sb_info *c,
 380                                    struct jffs2_eraseblock *jeb,
 381                                    struct jffs2_raw_node_ref *ref);
 382 
 383 /* nodemgmt.c */
 384 int jffs2_thread_should_wake(struct jffs2_sb_info *c);
 385 int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize,
 386                         uint32_t *len, int prio, uint32_t sumsize);
 387 int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize,
 388                         uint32_t *len, uint32_t sumsize);
 389 struct jffs2_raw_node_ref *jffs2_add_physical_node_ref(struct jffs2_sb_info *c, 
 390                                                        uint32_t ofs, uint32_t len,
 391                                                        struct jffs2_inode_cache *ic);
 392 void jffs2_complete_reservation(struct jffs2_sb_info *c);
 393 void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *raw);
 394 
 395 /* write.c */
 396 int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, uint32_t mode, struct jffs2_raw_inode *ri);
 397 
 398 struct jffs2_full_dnode *jffs2_write_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
 399                                            struct jffs2_raw_inode *ri, const unsigned char *data,
 400                                            uint32_t datalen, int alloc_mode);
 401 struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
 402                                              struct jffs2_raw_dirent *rd, const unsigned char *name,
 403                                              uint32_t namelen, int alloc_mode);
 404 int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
 405                             struct jffs2_raw_inode *ri, unsigned char *buf,
 406                             uint32_t offset, uint32_t writelen, uint32_t *retlen);
 407 int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, struct jffs2_inode_info *f,
 408                     struct jffs2_raw_inode *ri, const struct qstr *qstr);
 409 int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, const char *name,
 410                     int namelen, struct jffs2_inode_info *dead_f, uint32_t time);
 411 int jffs2_do_link(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino,
 412                    uint8_t type, const char *name, int namelen, uint32_t time);
 413 
 414 
 415 /* readinode.c */
 416 int jffs2_do_read_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
 417                         uint32_t ino, struct jffs2_raw_inode *latest_node);
 418 int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
 419 void jffs2_do_clear_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f);
 420 
 421 /* malloc.c */
 422 int jffs2_create_slab_caches(void);
 423 void jffs2_destroy_slab_caches(void);
 424 
 425 struct jffs2_full_dirent *jffs2_alloc_full_dirent(int namesize);
 426 void jffs2_free_full_dirent(struct jffs2_full_dirent *);
 427 struct jffs2_full_dnode *jffs2_alloc_full_dnode(void);
 428 void jffs2_free_full_dnode(struct jffs2_full_dnode *);
 429 struct jffs2_raw_dirent *jffs2_alloc_raw_dirent(void);
 430 void jffs2_free_raw_dirent(struct jffs2_raw_dirent *);
 431 struct jffs2_raw_inode *jffs2_alloc_raw_inode(void);
 432 void jffs2_free_raw_inode(struct jffs2_raw_inode *);
 433 struct jffs2_tmp_dnode_info *jffs2_alloc_tmp_dnode_info(void);
 434 void jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info *);
 435 int jffs2_prealloc_raw_node_refs(struct jffs2_sb_info *c,
 436                                  struct jffs2_eraseblock *jeb, int nr);
 437 void jffs2_free_refblock(struct jffs2_raw_node_ref *);
 438 struct jffs2_node_frag *jffs2_alloc_node_frag(void);
 439 void jffs2_free_node_frag(struct jffs2_node_frag *);
 440 struct jffs2_inode_cache *jffs2_alloc_inode_cache(void);
 441 void jffs2_free_inode_cache(struct jffs2_inode_cache *);
 442 #ifdef CONFIG_JFFS2_FS_XATTR
 443 struct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void);
 444 void jffs2_free_xattr_datum(struct jffs2_xattr_datum *);
 445 struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void);
 446 void jffs2_free_xattr_ref(struct jffs2_xattr_ref *);
 447 #endif
 448 
 449 /* gc.c */
 450 int jffs2_garbage_collect_pass(struct jffs2_sb_info *c);
 451 
 452 /* read.c */
 453 int jffs2_read_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
 454                      struct jffs2_full_dnode *fd, unsigned char *buf,
 455                      int ofs, int len);
 456 int jffs2_read_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
 457                            unsigned char *buf, uint32_t offset, uint32_t len);
 458 char *jffs2_getlink(struct jffs2_sb_info *c, struct jffs2_inode_info *f);
 459 
 460 /* scan.c */
 461 int jffs2_scan_medium(struct jffs2_sb_info *c);
 462 void jffs2_rotate_lists(struct jffs2_sb_info *c);
 463 struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino);
 464 int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
 465 int jffs2_scan_dirty_space(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t size);
 466 
 467 /* build.c */
 468 int jffs2_do_mount_fs(struct jffs2_sb_info *c);
 469 
 470 /* erase.c */
 471 int jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count);
 472 void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
 473 
 474 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
 475 /* wbuf.c */
 476 int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino);
 477 int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c);
 478 int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
 479 int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
 480 #endif
 481 
 482 #include "debug.h"
 483 
 484 #endif /* __JFFS2_NODELIST_H__ */