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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 | /* * JFFS2 -- Journalling Flash File System, Version 2. * * Copyright © 2001-2007 Red Hat, Inc. * * Created by David Woodhouse <dwmw2@infradead.org> * * For licensing information, see the file 'LICENCE' in this directory. * */ #ifndef __JFFS2_NODELIST_H__ #define __JFFS2_NODELIST_H__ #include <linux/fs.h> #include <linux/types.h> #include <linux/jffs2.h> #include "jffs2_fs_sb.h" #include "jffs2_fs_i.h" #include "xattr.h" #include "acl.h" #include "summary.h" #ifdef __ECOS #include "os-ecos.h" #else #include <linux/mtd/compatmac.h> /* For compatibility with older kernels */ #include "os-linux.h" #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 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)) #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 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))) #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 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))) #else #error wibble #endif /* The minimal node header size */ #define JFFS2_MIN_NODE_HEADER sizeof(struct jffs2_raw_dirent) /* 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 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 }; #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 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) /* 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 you need to modify gc.c accordingly. */ /* 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 { /* 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. */ 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; 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 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 INO_STATE_CLEARING 6 /* In clear_inode() */ #define INO_FLAGS_XATTR_CHECKED 0x01 /* has no duplicate xattr_ref */ #define RAWNODE_CLASS_INODE_CACHE 0 #define RAWNODE_CLASS_XATTR_DATUM 1 #define RAWNODE_CLASS_XATTR_REF 2 #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. */ 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 rb_node rb; struct jffs2_full_dnode *fn; uint32_t version; uint32_t data_crc; uint32_t partial_crc; 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 { 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 */ uint32_t allocated_refs; 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 */ }; static inline int jffs2_blocks_use_vmalloc(struct jffs2_sb_info *c) { return ((c->flash_size / c->sector_size) * sizeof (struct jffs2_eraseblock)) > (128 * 1024); } #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 */ #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 int jffs2_encode_dev(union jffs2_device_node *jdev, dev_t rdev) { if (old_valid_dev(rdev)) { jdev->old = cpu_to_je16(old_encode_dev(rdev)); return sizeof(jdev->old); } else { jdev->new = cpu_to_je32(new_encode_dev(rdev)); return sizeof(jdev->new); } } static inline struct jffs2_node_frag *frag_first(struct rb_root *root) { struct rb_node *node = rb_first(root); if (!node) return NULL; 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 = rb_last(root); if (!node) return NULL; return rb_entry(node, struct jffs2_node_frag, rb); } #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); #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); 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); int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn); 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 *len, int prio, uint32_t sumsize); int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize, uint32_t *len, uint32_t sumsize); 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, 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); /* readinode.c */ 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 *); 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); void jffs2_free_inode_cache(struct jffs2_inode_cache *); #ifdef CONFIG_JFFS2_FS_XATTR struct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void); void jffs2_free_xattr_datum(struct jffs2_xattr_datum *); struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void); void jffs2_free_xattr_ref(struct jffs2_xattr_ref *); #endif /* 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); 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_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); #ifdef CONFIG_JFFS2_FS_WRITEBUFFER /* 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 #include "debug.h" #endif /* __JFFS2_NODELIST_H__ */ |