1 /* 2 * This file is part of UBIFS. 3 * 4 * Copyright (C) 2006-2008 Nokia Corporation 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 as published by 8 * the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 * You should have received a copy of the GNU General Public License along with 16 * this program; if not, write to the Free Software Foundation, Inc., 51 17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 18 * 19 * Authors: Artem Bityutskiy (Битюцкий Артём) 20 * Adrian Hunter 21 */ 22 23 #ifndef __UBIFS_H__ 24 #define __UBIFS_H__ 25 26 #include <asm/div64.h> 27 #include <linux/statfs.h> 28 #include <linux/fs.h> 29 #include <linux/err.h> 30 #include <linux/sched.h> 31 #include <linux/slab.h> 32 #include <linux/vmalloc.h> 33 #include <linux/spinlock.h> 34 #include <linux/mutex.h> 35 #include <linux/rwsem.h> 36 #include <linux/mtd/ubi.h> 37 #include <linux/pagemap.h> 38 #include <linux/backing-dev.h> 39 #include "ubifs-media.h" 40 41 /* Version of this UBIFS implementation */ 42 #define UBIFS_VERSION 1 43 44 /* Normal UBIFS messages */ 45 #define ubifs_msg(fmt, ...) pr_notice("UBIFS: " fmt "\n", ##__VA_ARGS__) 46 /* UBIFS error messages */ 47 #define ubifs_err(fmt, ...) \ 48 pr_err("UBIFS error (pid %d): %s: " fmt "\n", current->pid, \ 49 __func__, ##__VA_ARGS__) 50 /* UBIFS warning messages */ 51 #define ubifs_warn(fmt, ...) \ 52 pr_warn("UBIFS warning (pid %d): %s: " fmt "\n", \ 53 current->pid, __func__, ##__VA_ARGS__) 54 55 /* UBIFS file system VFS magic number */ 56 #define UBIFS_SUPER_MAGIC 0x24051905 57 58 /* Number of UBIFS blocks per VFS page */ 59 #define UBIFS_BLOCKS_PER_PAGE (PAGE_CACHE_SIZE / UBIFS_BLOCK_SIZE) 60 #define UBIFS_BLOCKS_PER_PAGE_SHIFT (PAGE_CACHE_SHIFT - UBIFS_BLOCK_SHIFT) 61 62 /* "File system end of life" sequence number watermark */ 63 #define SQNUM_WARN_WATERMARK 0xFFFFFFFF00000000ULL 64 #define SQNUM_WATERMARK 0xFFFFFFFFFF000000ULL 65 66 /* 67 * Minimum amount of LEBs reserved for the index. At present the index needs at 68 * least 2 LEBs: one for the index head and one for in-the-gaps method (which 69 * currently does not cater for the index head and so excludes it from 70 * consideration). 71 */ 72 #define MIN_INDEX_LEBS 2 73 74 /* Minimum amount of data UBIFS writes to the flash */ 75 #define MIN_WRITE_SZ (UBIFS_DATA_NODE_SZ + 8) 76 77 /* 78 * Currently we do not support inode number overlapping and re-using, so this 79 * watermark defines dangerous inode number level. This should be fixed later, 80 * although it is difficult to exceed current limit. Another option is to use 81 * 64-bit inode numbers, but this means more overhead. 82 */ 83 #define INUM_WARN_WATERMARK 0xFFF00000 84 #define INUM_WATERMARK 0xFFFFFF00 85 86 /* Maximum number of entries in each LPT (LEB category) heap */ 87 #define LPT_HEAP_SZ 256 88 89 /* 90 * Background thread name pattern. The numbers are UBI device and volume 91 * numbers. 92 */ 93 #define BGT_NAME_PATTERN "ubifs_bgt%d_%d" 94 95 /* Write-buffer synchronization timeout interval in seconds */ 96 #define WBUF_TIMEOUT_SOFTLIMIT 3 97 #define WBUF_TIMEOUT_HARDLIMIT 5 98 99 /* Maximum possible inode number (only 32-bit inodes are supported now) */ 100 #define MAX_INUM 0xFFFFFFFF 101 102 /* Number of non-data journal heads */ 103 #define NONDATA_JHEADS_CNT 2 104 105 /* Shorter names for journal head numbers for internal usage */ 106 #define GCHD UBIFS_GC_HEAD 107 #define BASEHD UBIFS_BASE_HEAD 108 #define DATAHD UBIFS_DATA_HEAD 109 110 /* 'No change' value for 'ubifs_change_lp()' */ 111 #define LPROPS_NC 0x80000001 112 113 /* 114 * There is no notion of truncation key because truncation nodes do not exist 115 * in TNC. However, when replaying, it is handy to introduce fake "truncation" 116 * keys for truncation nodes because the code becomes simpler. So we define 117 * %UBIFS_TRUN_KEY type. 118 * 119 * But otherwise, out of the journal reply scope, the truncation keys are 120 * invalid. 121 */ 122 #define UBIFS_TRUN_KEY UBIFS_KEY_TYPES_CNT 123 #define UBIFS_INVALID_KEY UBIFS_KEY_TYPES_CNT 124 125 /* 126 * How much a directory entry/extended attribute entry adds to the parent/host 127 * inode. 128 */ 129 #define CALC_DENT_SIZE(name_len) ALIGN(UBIFS_DENT_NODE_SZ + (name_len) + 1, 8) 130 131 /* How much an extended attribute adds to the host inode */ 132 #define CALC_XATTR_BYTES(data_len) ALIGN(UBIFS_INO_NODE_SZ + (data_len) + 1, 8) 133 134 /* 135 * Znodes which were not touched for 'OLD_ZNODE_AGE' seconds are considered 136 * "old", and znode which were touched last 'YOUNG_ZNODE_AGE' seconds ago are 137 * considered "young". This is used by shrinker when selecting znode to trim 138 * off. 139 */ 140 #define OLD_ZNODE_AGE 20 141 #define YOUNG_ZNODE_AGE 5 142 143 /* 144 * Some compressors, like LZO, may end up with more data then the input buffer. 145 * So UBIFS always allocates larger output buffer, to be sure the compressor 146 * will not corrupt memory in case of worst case compression. 147 */ 148 #define WORST_COMPR_FACTOR 2 149 150 /* 151 * How much memory is needed for a buffer where we comress a data node. 152 */ 153 #define COMPRESSED_DATA_NODE_BUF_SZ \ 154 (UBIFS_DATA_NODE_SZ + UBIFS_BLOCK_SIZE * WORST_COMPR_FACTOR) 155 156 /* Maximum expected tree height for use by bottom_up_buf */ 157 #define BOTTOM_UP_HEIGHT 64 158 159 /* Maximum number of data nodes to bulk-read */ 160 #define UBIFS_MAX_BULK_READ 32 161 162 /* 163 * Lockdep classes for UBIFS inode @ui_mutex. 164 */ 165 enum { 166 WB_MUTEX_1 = 0, 167 WB_MUTEX_2 = 1, 168 WB_MUTEX_3 = 2, 169 }; 170 171 /* 172 * Znode flags (actually, bit numbers which store the flags). 173 * 174 * DIRTY_ZNODE: znode is dirty 175 * COW_ZNODE: znode is being committed and a new instance of this znode has to 176 * be created before changing this znode 177 * OBSOLETE_ZNODE: znode is obsolete, which means it was deleted, but it is 178 * still in the commit list and the ongoing commit operation 179 * will commit it, and delete this znode after it is done 180 */ 181 enum { 182 DIRTY_ZNODE = 0, 183 COW_ZNODE = 1, 184 OBSOLETE_ZNODE = 2, 185 }; 186 187 /* 188 * Commit states. 189 * 190 * COMMIT_RESTING: commit is not wanted 191 * COMMIT_BACKGROUND: background commit has been requested 192 * COMMIT_REQUIRED: commit is required 193 * COMMIT_RUNNING_BACKGROUND: background commit is running 194 * COMMIT_RUNNING_REQUIRED: commit is running and it is required 195 * COMMIT_BROKEN: commit failed 196 */ 197 enum { 198 COMMIT_RESTING = 0, 199 COMMIT_BACKGROUND, 200 COMMIT_REQUIRED, 201 COMMIT_RUNNING_BACKGROUND, 202 COMMIT_RUNNING_REQUIRED, 203 COMMIT_BROKEN, 204 }; 205 206 /* 207 * 'ubifs_scan_a_node()' return values. 208 * 209 * SCANNED_GARBAGE: scanned garbage 210 * SCANNED_EMPTY_SPACE: scanned empty space 211 * SCANNED_A_NODE: scanned a valid node 212 * SCANNED_A_CORRUPT_NODE: scanned a corrupted node 213 * SCANNED_A_BAD_PAD_NODE: scanned a padding node with invalid pad length 214 * 215 * Greater than zero means: 'scanned that number of padding bytes' 216 */ 217 enum { 218 SCANNED_GARBAGE = 0, 219 SCANNED_EMPTY_SPACE = -1, 220 SCANNED_A_NODE = -2, 221 SCANNED_A_CORRUPT_NODE = -3, 222 SCANNED_A_BAD_PAD_NODE = -4, 223 }; 224 225 /* 226 * LPT cnode flag bits. 227 * 228 * DIRTY_CNODE: cnode is dirty 229 * OBSOLETE_CNODE: cnode is being committed and has been copied (or deleted), 230 * so it can (and must) be freed when the commit is finished 231 * COW_CNODE: cnode is being committed and must be copied before writing 232 */ 233 enum { 234 DIRTY_CNODE = 0, 235 OBSOLETE_CNODE = 1, 236 COW_CNODE = 2, 237 }; 238 239 /* 240 * Dirty flag bits (lpt_drty_flgs) for LPT special nodes. 241 * 242 * LTAB_DIRTY: ltab node is dirty 243 * LSAVE_DIRTY: lsave node is dirty 244 */ 245 enum { 246 LTAB_DIRTY = 1, 247 LSAVE_DIRTY = 2, 248 }; 249 250 /* 251 * Return codes used by the garbage collector. 252 * @LEB_FREED: the logical eraseblock was freed and is ready to use 253 * @LEB_FREED_IDX: indexing LEB was freed and can be used only after the commit 254 * @LEB_RETAINED: the logical eraseblock was freed and retained for GC purposes 255 */ 256 enum { 257 LEB_FREED, 258 LEB_FREED_IDX, 259 LEB_RETAINED, 260 }; 261 262 /** 263 * struct ubifs_old_idx - index node obsoleted since last commit start. 264 * @rb: rb-tree node 265 * @lnum: LEB number of obsoleted index node 266 * @offs: offset of obsoleted index node 267 */ 268 struct ubifs_old_idx { 269 struct rb_node rb; 270 int lnum; 271 int offs; 272 }; 273 274 /* The below union makes it easier to deal with keys */ 275 union ubifs_key { 276 uint8_t u8[UBIFS_SK_LEN]; 277 uint32_t u32[UBIFS_SK_LEN/4]; 278 uint64_t u64[UBIFS_SK_LEN/8]; 279 __le32 j32[UBIFS_SK_LEN/4]; 280 }; 281 282 /** 283 * struct ubifs_scan_node - UBIFS scanned node information. 284 * @list: list of scanned nodes 285 * @key: key of node scanned (if it has one) 286 * @sqnum: sequence number 287 * @type: type of node scanned 288 * @offs: offset with LEB of node scanned 289 * @len: length of node scanned 290 * @node: raw node 291 */ 292 struct ubifs_scan_node { 293 struct list_head list; 294 union ubifs_key key; 295 unsigned long long sqnum; 296 int type; 297 int offs; 298 int len; 299 void *node; 300 }; 301 302 /** 303 * struct ubifs_scan_leb - UBIFS scanned LEB information. 304 * @lnum: logical eraseblock number 305 * @nodes_cnt: number of nodes scanned 306 * @nodes: list of struct ubifs_scan_node 307 * @endpt: end point (and therefore the start of empty space) 308 * @ecc: read returned -EBADMSG 309 * @buf: buffer containing entire LEB scanned 310 */ 311 struct ubifs_scan_leb { 312 int lnum; 313 int nodes_cnt; 314 struct list_head nodes; 315 int endpt; 316 int ecc; 317 void *buf; 318 }; 319 320 /** 321 * struct ubifs_gced_idx_leb - garbage-collected indexing LEB. 322 * @list: list 323 * @lnum: LEB number 324 * @unmap: OK to unmap this LEB 325 * 326 * This data structure is used to temporary store garbage-collected indexing 327 * LEBs - they are not released immediately, but only after the next commit. 328 * This is needed to guarantee recoverability. 329 */ 330 struct ubifs_gced_idx_leb { 331 struct list_head list; 332 int lnum; 333 int unmap; 334 }; 335 336 /** 337 * struct ubifs_inode - UBIFS in-memory inode description. 338 * @vfs_inode: VFS inode description object 339 * @creat_sqnum: sequence number at time of creation 340 * @del_cmtno: commit number corresponding to the time the inode was deleted, 341 * protected by @c->commit_sem; 342 * @xattr_size: summarized size of all extended attributes in bytes 343 * @xattr_cnt: count of extended attributes this inode has 344 * @xattr_names: sum of lengths of all extended attribute names belonging to 345 * this inode 346 * @dirty: non-zero if the inode is dirty 347 * @xattr: non-zero if this is an extended attribute inode 348 * @bulk_read: non-zero if bulk-read should be used 349 * @ui_mutex: serializes inode write-back with the rest of VFS operations, 350 * serializes "clean <-> dirty" state changes, serializes bulk-read, 351 * protects @dirty, @bulk_read, @ui_size, and @xattr_size 352 * @ui_lock: protects @synced_i_size 353 * @synced_i_size: synchronized size of inode, i.e. the value of inode size 354 * currently stored on the flash; used only for regular file 355 * inodes 356 * @ui_size: inode size used by UBIFS when writing to flash 357 * @flags: inode flags (@UBIFS_COMPR_FL, etc) 358 * @compr_type: default compression type used for this inode 359 * @last_page_read: page number of last page read (for bulk read) 360 * @read_in_a_row: number of consecutive pages read in a row (for bulk read) 361 * @data_len: length of the data attached to the inode 362 * @data: inode's data 363 * 364 * @ui_mutex exists for two main reasons. At first it prevents inodes from 365 * being written back while UBIFS changing them, being in the middle of an VFS 366 * operation. This way UBIFS makes sure the inode fields are consistent. For 367 * example, in 'ubifs_rename()' we change 3 inodes simultaneously, and 368 * write-back must not write any of them before we have finished. 369 * 370 * The second reason is budgeting - UBIFS has to budget all operations. If an 371 * operation is going to mark an inode dirty, it has to allocate budget for 372 * this. It cannot just mark it dirty because there is no guarantee there will 373 * be enough flash space to write the inode back later. This means UBIFS has 374 * to have full control over inode "clean <-> dirty" transitions (and pages 375 * actually). But unfortunately, VFS marks inodes dirty in many places, and it 376 * does not ask the file-system if it is allowed to do so (there is a notifier, 377 * but it is not enough), i.e., there is no mechanism to synchronize with this. 378 * So UBIFS has its own inode dirty flag and its own mutex to serialize 379 * "clean <-> dirty" transitions. 380 * 381 * The @synced_i_size field is used to make sure we never write pages which are 382 * beyond last synchronized inode size. See 'ubifs_writepage()' for more 383 * information. 384 * 385 * The @ui_size is a "shadow" variable for @inode->i_size and UBIFS uses 386 * @ui_size instead of @inode->i_size. The reason for this is that UBIFS cannot 387 * make sure @inode->i_size is always changed under @ui_mutex, because it 388 * cannot call 'truncate_setsize()' with @ui_mutex locked, because it would 389 * deadlock with 'ubifs_writepage()' (see file.c). All the other inode fields 390 * are changed under @ui_mutex, so they do not need "shadow" fields. Note, one 391 * could consider to rework locking and base it on "shadow" fields. 392 */ 393 struct ubifs_inode { 394 struct inode vfs_inode; 395 unsigned long long creat_sqnum; 396 unsigned long long del_cmtno; 397 unsigned int xattr_size; 398 unsigned int xattr_cnt; 399 unsigned int xattr_names; 400 unsigned int dirty:1; 401 unsigned int xattr:1; 402 unsigned int bulk_read:1; 403 unsigned int compr_type:2; 404 struct mutex ui_mutex; 405 spinlock_t ui_lock; 406 loff_t synced_i_size; 407 loff_t ui_size; 408 int flags; 409 pgoff_t last_page_read; 410 pgoff_t read_in_a_row; 411 int data_len; 412 void *data; 413 }; 414 415 /** 416 * struct ubifs_unclean_leb - records a LEB recovered under read-only mode. 417 * @list: list 418 * @lnum: LEB number of recovered LEB 419 * @endpt: offset where recovery ended 420 * 421 * This structure records a LEB identified during recovery that needs to be 422 * cleaned but was not because UBIFS was mounted read-only. The information 423 * is used to clean the LEB when remounting to read-write mode. 424 */ 425 struct ubifs_unclean_leb { 426 struct list_head list; 427 int lnum; 428 int endpt; 429 }; 430 431 /* 432 * LEB properties flags. 433 * 434 * LPROPS_UNCAT: not categorized 435 * LPROPS_DIRTY: dirty > free, dirty >= @c->dead_wm, not index 436 * LPROPS_DIRTY_IDX: dirty + free > @c->min_idx_node_sze and index 437 * LPROPS_FREE: free > 0, dirty < @c->dead_wm, not empty, not index 438 * LPROPS_HEAP_CNT: number of heaps used for storing categorized LEBs 439 * LPROPS_EMPTY: LEB is empty, not taken 440 * LPROPS_FREEABLE: free + dirty == leb_size, not index, not taken 441 * LPROPS_FRDI_IDX: free + dirty == leb_size and index, may be taken 442 * LPROPS_CAT_MASK: mask for the LEB categories above 443 * LPROPS_TAKEN: LEB was taken (this flag is not saved on the media) 444 * LPROPS_INDEX: LEB contains indexing nodes (this flag also exists on flash) 445 */ 446 enum { 447 LPROPS_UNCAT = 0, 448 LPROPS_DIRTY = 1, 449 LPROPS_DIRTY_IDX = 2, 450 LPROPS_FREE = 3, 451 LPROPS_HEAP_CNT = 3, 452 LPROPS_EMPTY = 4, 453 LPROPS_FREEABLE = 5, 454 LPROPS_FRDI_IDX = 6, 455 LPROPS_CAT_MASK = 15, 456 LPROPS_TAKEN = 16, 457 LPROPS_INDEX = 32, 458 }; 459 460 /** 461 * struct ubifs_lprops - logical eraseblock properties. 462 * @free: amount of free space in bytes 463 * @dirty: amount of dirty space in bytes 464 * @flags: LEB properties flags (see above) 465 * @lnum: LEB number 466 * @list: list of same-category lprops (for LPROPS_EMPTY and LPROPS_FREEABLE) 467 * @hpos: heap position in heap of same-category lprops (other categories) 468 */ 469 struct ubifs_lprops { 470 int free; 471 int dirty; 472 int flags; 473 int lnum; 474 union { 475 struct list_head list; 476 int hpos; 477 }; 478 }; 479 480 /** 481 * struct ubifs_lpt_lprops - LPT logical eraseblock properties. 482 * @free: amount of free space in bytes 483 * @dirty: amount of dirty space in bytes 484 * @tgc: trivial GC flag (1 => unmap after commit end) 485 * @cmt: commit flag (1 => reserved for commit) 486 */ 487 struct ubifs_lpt_lprops { 488 int free; 489 int dirty; 490 unsigned tgc:1; 491 unsigned cmt:1; 492 }; 493 494 /** 495 * struct ubifs_lp_stats - statistics of eraseblocks in the main area. 496 * @empty_lebs: number of empty LEBs 497 * @taken_empty_lebs: number of taken LEBs 498 * @idx_lebs: number of indexing LEBs 499 * @total_free: total free space in bytes (includes all LEBs) 500 * @total_dirty: total dirty space in bytes (includes all LEBs) 501 * @total_used: total used space in bytes (does not include index LEBs) 502 * @total_dead: total dead space in bytes (does not include index LEBs) 503 * @total_dark: total dark space in bytes (does not include index LEBs) 504 * 505 * The @taken_empty_lebs field counts the LEBs that are in the transient state 506 * of having been "taken" for use but not yet written to. @taken_empty_lebs is 507 * needed to account correctly for @gc_lnum, otherwise @empty_lebs could be 508 * used by itself (in which case 'unused_lebs' would be a better name). In the 509 * case of @gc_lnum, it is "taken" at mount time or whenever a LEB is retained 510 * by GC, but unlike other empty LEBs that are "taken", it may not be written 511 * straight away (i.e. before the next commit start or unmount), so either 512 * @gc_lnum must be specially accounted for, or the current approach followed 513 * i.e. count it under @taken_empty_lebs. 514 * 515 * @empty_lebs includes @taken_empty_lebs. 516 * 517 * @total_used, @total_dead and @total_dark fields do not account indexing 518 * LEBs. 519 */ 520 struct ubifs_lp_stats { 521 int empty_lebs; 522 int taken_empty_lebs; 523 int idx_lebs; 524 long long total_free; 525 long long total_dirty; 526 long long total_used; 527 long long total_dead; 528 long long total_dark; 529 }; 530 531 struct ubifs_nnode; 532 533 /** 534 * struct ubifs_cnode - LEB Properties Tree common node. 535 * @parent: parent nnode 536 * @cnext: next cnode to commit 537 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE) 538 * @iip: index in parent 539 * @level: level in the tree (zero for pnodes, greater than zero for nnodes) 540 * @num: node number 541 */ 542 struct ubifs_cnode { 543 struct ubifs_nnode *parent; 544 struct ubifs_cnode *cnext; 545 unsigned long flags; 546 int iip; 547 int level; 548 int num; 549 }; 550 551 /** 552 * struct ubifs_pnode - LEB Properties Tree leaf node. 553 * @parent: parent nnode 554 * @cnext: next cnode to commit 555 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE) 556 * @iip: index in parent 557 * @level: level in the tree (always zero for pnodes) 558 * @num: node number 559 * @lprops: LEB properties array 560 */ 561 struct ubifs_pnode { 562 struct ubifs_nnode *parent; 563 struct ubifs_cnode *cnext; 564 unsigned long flags; 565 int iip; 566 int level; 567 int num; 568 struct ubifs_lprops lprops[UBIFS_LPT_FANOUT]; 569 }; 570 571 /** 572 * struct ubifs_nbranch - LEB Properties Tree internal node branch. 573 * @lnum: LEB number of child 574 * @offs: offset of child 575 * @nnode: nnode child 576 * @pnode: pnode child 577 * @cnode: cnode child 578 */ 579 struct ubifs_nbranch { 580 int lnum; 581 int offs; 582 union { 583 struct ubifs_nnode *nnode; 584 struct ubifs_pnode *pnode; 585 struct ubifs_cnode *cnode; 586 }; 587 }; 588 589 /** 590 * struct ubifs_nnode - LEB Properties Tree internal node. 591 * @parent: parent nnode 592 * @cnext: next cnode to commit 593 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE) 594 * @iip: index in parent 595 * @level: level in the tree (always greater than zero for nnodes) 596 * @num: node number 597 * @nbranch: branches to child nodes 598 */ 599 struct ubifs_nnode { 600 struct ubifs_nnode *parent; 601 struct ubifs_cnode *cnext; 602 unsigned long flags; 603 int iip; 604 int level; 605 int num; 606 struct ubifs_nbranch nbranch[UBIFS_LPT_FANOUT]; 607 }; 608 609 /** 610 * struct ubifs_lpt_heap - heap of categorized lprops. 611 * @arr: heap array 612 * @cnt: number in heap 613 * @max_cnt: maximum number allowed in heap 614 * 615 * There are %LPROPS_HEAP_CNT heaps. 616 */ 617 struct ubifs_lpt_heap { 618 struct ubifs_lprops **arr; 619 int cnt; 620 int max_cnt; 621 }; 622 623 /* 624 * Return codes for LPT scan callback function. 625 * 626 * LPT_SCAN_CONTINUE: continue scanning 627 * LPT_SCAN_ADD: add the LEB properties scanned to the tree in memory 628 * LPT_SCAN_STOP: stop scanning 629 */ 630 enum { 631 LPT_SCAN_CONTINUE = 0, 632 LPT_SCAN_ADD = 1, 633 LPT_SCAN_STOP = 2, 634 }; 635 636 struct ubifs_info; 637 638 /* Callback used by the 'ubifs_lpt_scan_nolock()' function */ 639 typedef int (*ubifs_lpt_scan_callback)(struct ubifs_info *c, 640 const struct ubifs_lprops *lprops, 641 int in_tree, void *data); 642 643 /** 644 * struct ubifs_wbuf - UBIFS write-buffer. 645 * @c: UBIFS file-system description object 646 * @buf: write-buffer (of min. flash I/O unit size) 647 * @lnum: logical eraseblock number the write-buffer points to 648 * @offs: write-buffer offset in this logical eraseblock 649 * @avail: number of bytes available in the write-buffer 650 * @used: number of used bytes in the write-buffer 651 * @size: write-buffer size (in [@c->min_io_size, @c->max_write_size] range) 652 * @jhead: journal head the mutex belongs to (note, needed only to shut lockdep 653 * up by 'mutex_lock_nested()). 654 * @sync_callback: write-buffer synchronization callback 655 * @io_mutex: serializes write-buffer I/O 656 * @lock: serializes @buf, @lnum, @offs, @avail, @used, @next_ino and @inodes 657 * fields 658 * @softlimit: soft write-buffer timeout interval 659 * @delta: hard and soft timeouts delta (the timer expire inteval is @softlimit 660 * and @softlimit + @delta) 661 * @timer: write-buffer timer 662 * @no_timer: non-zero if this write-buffer does not have a timer 663 * @need_sync: non-zero if the timer expired and the wbuf needs sync'ing 664 * @next_ino: points to the next position of the following inode number 665 * @inodes: stores the inode numbers of the nodes which are in wbuf 666 * 667 * The write-buffer synchronization callback is called when the write-buffer is 668 * synchronized in order to notify how much space was wasted due to 669 * write-buffer padding and how much free space is left in the LEB. 670 * 671 * Note: the fields @buf, @lnum, @offs, @avail and @used can be read under 672 * spin-lock or mutex because they are written under both mutex and spin-lock. 673 * @buf is appended to under mutex but overwritten under both mutex and 674 * spin-lock. Thus the data between @buf and @buf + @used can be read under 675 * spinlock. 676 */ 677 struct ubifs_wbuf { 678 struct ubifs_info *c; 679 void *buf; 680 int lnum; 681 int offs; 682 int avail; 683 int used; 684 int size; 685 int jhead; 686 int (*sync_callback)(struct ubifs_info *c, int lnum, int free, int pad); 687 struct mutex io_mutex; 688 spinlock_t lock; 689 ktime_t softlimit; 690 unsigned long long delta; 691 struct hrtimer timer; 692 unsigned int no_timer:1; 693 unsigned int need_sync:1; 694 int next_ino; 695 ino_t *inodes; 696 }; 697 698 /** 699 * struct ubifs_bud - bud logical eraseblock. 700 * @lnum: logical eraseblock number 701 * @start: where the (uncommitted) bud data starts 702 * @jhead: journal head number this bud belongs to 703 * @list: link in the list buds belonging to the same journal head 704 * @rb: link in the tree of all buds 705 */ 706 struct ubifs_bud { 707 int lnum; 708 int start; 709 int jhead; 710 struct list_head list; 711 struct rb_node rb; 712 }; 713 714 /** 715 * struct ubifs_jhead - journal head. 716 * @wbuf: head's write-buffer 717 * @buds_list: list of bud LEBs belonging to this journal head 718 * @grouped: non-zero if UBIFS groups nodes when writing to this journal head 719 * 720 * Note, the @buds list is protected by the @c->buds_lock. 721 */ 722 struct ubifs_jhead { 723 struct ubifs_wbuf wbuf; 724 struct list_head buds_list; 725 unsigned int grouped:1; 726 }; 727 728 /** 729 * struct ubifs_zbranch - key/coordinate/length branch stored in znodes. 730 * @key: key 731 * @znode: znode address in memory 732 * @lnum: LEB number of the target node (indexing node or data node) 733 * @offs: target node offset within @lnum 734 * @len: target node length 735 */ 736 struct ubifs_zbranch { 737 union ubifs_key key; 738 union { 739 struct ubifs_znode *znode; 740 void *leaf; 741 }; 742 int lnum; 743 int offs; 744 int len; 745 }; 746 747 /** 748 * struct ubifs_znode - in-memory representation of an indexing node. 749 * @parent: parent znode or NULL if it is the root 750 * @cnext: next znode to commit 751 * @flags: znode flags (%DIRTY_ZNODE, %COW_ZNODE or %OBSOLETE_ZNODE) 752 * @time: last access time (seconds) 753 * @level: level of the entry in the TNC tree 754 * @child_cnt: count of child znodes 755 * @iip: index in parent's zbranch array 756 * @alt: lower bound of key range has altered i.e. child inserted at slot 0 757 * @lnum: LEB number of the corresponding indexing node 758 * @offs: offset of the corresponding indexing node 759 * @len: length of the corresponding indexing node 760 * @zbranch: array of znode branches (@c->fanout elements) 761 * 762 * Note! The @lnum, @offs, and @len fields are not really needed - we have them 763 * only for internal consistency check. They could be removed to save some RAM. 764 */ 765 struct ubifs_znode { 766 struct ubifs_znode *parent; 767 struct ubifs_znode *cnext; 768 unsigned long flags; 769 unsigned long time; 770 int level; 771 int child_cnt; 772 int iip; 773 int alt; 774 int lnum; 775 int offs; 776 int len; 777 struct ubifs_zbranch zbranch[]; 778 }; 779 780 /** 781 * struct bu_info - bulk-read information. 782 * @key: first data node key 783 * @zbranch: zbranches of data nodes to bulk read 784 * @buf: buffer to read into 785 * @buf_len: buffer length 786 * @gc_seq: GC sequence number to detect races with GC 787 * @cnt: number of data nodes for bulk read 788 * @blk_cnt: number of data blocks including holes 789 * @oef: end of file reached 790 */ 791 struct bu_info { 792 union ubifs_key key; 793 struct ubifs_zbranch zbranch[UBIFS_MAX_BULK_READ]; 794 void *buf; 795 int buf_len; 796 int gc_seq; 797 int cnt; 798 int blk_cnt; 799 int eof; 800 }; 801 802 /** 803 * struct ubifs_node_range - node length range description data structure. 804 * @len: fixed node length 805 * @min_len: minimum possible node length 806 * @max_len: maximum possible node length 807 * 808 * If @max_len is %0, the node has fixed length @len. 809 */ 810 struct ubifs_node_range { 811 union { 812 int len; 813 int min_len; 814 }; 815 int max_len; 816 }; 817 818 /** 819 * struct ubifs_compressor - UBIFS compressor description structure. 820 * @compr_type: compressor type (%UBIFS_COMPR_LZO, etc) 821 * @cc: cryptoapi compressor handle 822 * @comp_mutex: mutex used during compression 823 * @decomp_mutex: mutex used during decompression 824 * @name: compressor name 825 * @capi_name: cryptoapi compressor name 826 */ 827 struct ubifs_compressor { 828 int compr_type; 829 struct crypto_comp *cc; 830 struct mutex *comp_mutex; 831 struct mutex *decomp_mutex; 832 const char *name; 833 const char *capi_name; 834 }; 835 836 /** 837 * struct ubifs_budget_req - budget requirements of an operation. 838 * 839 * @fast: non-zero if the budgeting should try to acquire budget quickly and 840 * should not try to call write-back 841 * @recalculate: non-zero if @idx_growth, @data_growth, and @dd_growth fields 842 * have to be re-calculated 843 * @new_page: non-zero if the operation adds a new page 844 * @dirtied_page: non-zero if the operation makes a page dirty 845 * @new_dent: non-zero if the operation adds a new directory entry 846 * @mod_dent: non-zero if the operation removes or modifies an existing 847 * directory entry 848 * @new_ino: non-zero if the operation adds a new inode 849 * @new_ino_d: now much data newly created inode contains 850 * @dirtied_ino: how many inodes the operation makes dirty 851 * @dirtied_ino_d: now much data dirtied inode contains 852 * @idx_growth: how much the index will supposedly grow 853 * @data_growth: how much new data the operation will supposedly add 854 * @dd_growth: how much data that makes other data dirty the operation will 855 * supposedly add 856 * 857 * @idx_growth, @data_growth and @dd_growth are not used in budget request. The 858 * budgeting subsystem caches index and data growth values there to avoid 859 * re-calculating them when the budget is released. However, if @idx_growth is 860 * %-1, it is calculated by the release function using other fields. 861 * 862 * An inode may contain 4KiB of data at max., thus the widths of @new_ino_d 863 * is 13 bits, and @dirtied_ino_d - 15, because up to 4 inodes may be made 864 * dirty by the re-name operation. 865 * 866 * Note, UBIFS aligns node lengths to 8-bytes boundary, so the requester has to 867 * make sure the amount of inode data which contribute to @new_ino_d and 868 * @dirtied_ino_d fields are aligned. 869 */ 870 struct ubifs_budget_req { 871 unsigned int fast:1; 872 unsigned int recalculate:1; 873 #ifndef UBIFS_DEBUG 874 unsigned int new_page:1; 875 unsigned int dirtied_page:1; 876 unsigned int new_dent:1; 877 unsigned int mod_dent:1; 878 unsigned int new_ino:1; 879 unsigned int new_ino_d:13; 880 unsigned int dirtied_ino:4; 881 unsigned int dirtied_ino_d:15; 882 #else 883 /* Not bit-fields to check for overflows */ 884 unsigned int new_page; 885 unsigned int dirtied_page; 886 unsigned int new_dent; 887 unsigned int mod_dent; 888 unsigned int new_ino; 889 unsigned int new_ino_d; 890 unsigned int dirtied_ino; 891 unsigned int dirtied_ino_d; 892 #endif 893 int idx_growth; 894 int data_growth; 895 int dd_growth; 896 }; 897 898 /** 899 * struct ubifs_orphan - stores the inode number of an orphan. 900 * @rb: rb-tree node of rb-tree of orphans sorted by inode number 901 * @list: list head of list of orphans in order added 902 * @new_list: list head of list of orphans added since the last commit 903 * @cnext: next orphan to commit 904 * @dnext: next orphan to delete 905 * @inum: inode number 906 * @new: %1 => added since the last commit, otherwise %0 907 * @cmt: %1 => commit pending, otherwise %0 908 * @del: %1 => delete pending, otherwise %0 909 */ 910 struct ubifs_orphan { 911 struct rb_node rb; 912 struct list_head list; 913 struct list_head new_list; 914 struct ubifs_orphan *cnext; 915 struct ubifs_orphan *dnext; 916 ino_t inum; 917 unsigned new:1; 918 unsigned cmt:1; 919 unsigned del:1; 920 }; 921 922 /** 923 * struct ubifs_mount_opts - UBIFS-specific mount options information. 924 * @unmount_mode: selected unmount mode (%0 default, %1 normal, %2 fast) 925 * @bulk_read: enable/disable bulk-reads (%0 default, %1 disabe, %2 enable) 926 * @chk_data_crc: enable/disable CRC data checking when reading data nodes 927 * (%0 default, %1 disabe, %2 enable) 928 * @override_compr: override default compressor (%0 - do not override and use 929 * superblock compressor, %1 - override and use compressor 930 * specified in @compr_type) 931 * @compr_type: compressor type to override the superblock compressor with 932 * (%UBIFS_COMPR_NONE, etc) 933 */ 934 struct ubifs_mount_opts { 935 unsigned int unmount_mode:2; 936 unsigned int bulk_read:2; 937 unsigned int chk_data_crc:2; 938 unsigned int override_compr:1; 939 unsigned int compr_type:2; 940 }; 941 942 /** 943 * struct ubifs_budg_info - UBIFS budgeting information. 944 * @idx_growth: amount of bytes budgeted for index growth 945 * @data_growth: amount of bytes budgeted for cached data 946 * @dd_growth: amount of bytes budgeted for cached data that will make 947 * other data dirty 948 * @uncommitted_idx: amount of bytes were budgeted for growth of the index, but 949 * which still have to be taken into account because the index 950 * has not been committed so far 951 * @old_idx_sz: size of index on flash 952 * @min_idx_lebs: minimum number of LEBs required for the index 953 * @nospace: non-zero if the file-system does not have flash space (used as 954 * optimization) 955 * @nospace_rp: the same as @nospace, but additionally means that even reserved 956 * pool is full 957 * @page_budget: budget for a page (constant, nenver changed after mount) 958 * @inode_budget: budget for an inode (constant, nenver changed after mount) 959 * @dent_budget: budget for a directory entry (constant, nenver changed after 960 * mount) 961 */ 962 struct ubifs_budg_info { 963 long long idx_growth; 964 long long data_growth; 965 long long dd_growth; 966 long long uncommitted_idx; 967 unsigned long long old_idx_sz; 968 int min_idx_lebs; 969 unsigned int nospace:1; 970 unsigned int nospace_rp:1; 971 int page_budget; 972 int inode_budget; 973 int dent_budget; 974 }; 975 976 struct ubifs_debug_info; 977 978 /** 979 * struct ubifs_info - UBIFS file-system description data structure 980 * (per-superblock). 981 * @vfs_sb: VFS @struct super_block object 982 * @bdi: backing device info object to make VFS happy and disable read-ahead 983 * 984 * @highest_inum: highest used inode number 985 * @max_sqnum: current global sequence number 986 * @cmt_no: commit number of the last successfully completed commit, protected 987 * by @commit_sem 988 * @cnt_lock: protects @highest_inum and @max_sqnum counters 989 * @fmt_version: UBIFS on-flash format version 990 * @ro_compat_version: R/O compatibility version 991 * @uuid: UUID from super block 992 * 993 * @lhead_lnum: log head logical eraseblock number 994 * @lhead_offs: log head offset 995 * @ltail_lnum: log tail logical eraseblock number (offset is always 0) 996 * @log_mutex: protects the log, @lhead_lnum, @lhead_offs, @ltail_lnum, and 997 * @bud_bytes 998 * @min_log_bytes: minimum required number of bytes in the log 999 * @cmt_bud_bytes: used during commit to temporarily amount of bytes in 1000 * committed buds 1001 * 1002 * @buds: tree of all buds indexed by bud LEB number 1003 * @bud_bytes: how many bytes of flash is used by buds 1004 * @buds_lock: protects the @buds tree, @bud_bytes, and per-journal head bud 1005 * lists 1006 * @jhead_cnt: count of journal heads 1007 * @jheads: journal heads (head zero is base head) 1008 * @max_bud_bytes: maximum number of bytes allowed in buds 1009 * @bg_bud_bytes: number of bud bytes when background commit is initiated 1010 * @old_buds: buds to be released after commit ends 1011 * @max_bud_cnt: maximum number of buds 1012 * 1013 * @commit_sem: synchronizes committer with other processes 1014 * @cmt_state: commit state 1015 * @cs_lock: commit state lock 1016 * @cmt_wq: wait queue to sleep on if the log is full and a commit is running 1017 * 1018 * @big_lpt: flag that LPT is too big to write whole during commit 1019 * @space_fixup: flag indicating that free space in LEBs needs to be cleaned up 1020 * @no_chk_data_crc: do not check CRCs when reading data nodes (except during 1021 * recovery) 1022 * @bulk_read: enable bulk-reads 1023 * @default_compr: default compression algorithm (%UBIFS_COMPR_LZO, etc) 1024 * @rw_incompat: the media is not R/W compatible 1025 * 1026 * @tnc_mutex: protects the Tree Node Cache (TNC), @zroot, @cnext, @enext, and 1027 * @calc_idx_sz 1028 * @zroot: zbranch which points to the root index node and znode 1029 * @cnext: next znode to commit 1030 * @enext: next znode to commit to empty space 1031 * @gap_lebs: array of LEBs used by the in-gaps commit method 1032 * @cbuf: commit buffer 1033 * @ileb_buf: buffer for commit in-the-gaps method 1034 * @ileb_len: length of data in ileb_buf 1035 * @ihead_lnum: LEB number of index head 1036 * @ihead_offs: offset of index head 1037 * @ilebs: pre-allocated index LEBs 1038 * @ileb_cnt: number of pre-allocated index LEBs 1039 * @ileb_nxt: next pre-allocated index LEBs 1040 * @old_idx: tree of index nodes obsoleted since the last commit start 1041 * @bottom_up_buf: a buffer which is used by 'dirty_cow_bottom_up()' in tnc.c 1042 * 1043 * @mst_node: master node 1044 * @mst_offs: offset of valid master node 1045 * @mst_mutex: protects the master node area, @mst_node, and @mst_offs 1046 * 1047 * @max_bu_buf_len: maximum bulk-read buffer length 1048 * @bu_mutex: protects the pre-allocated bulk-read buffer and @c->bu 1049 * @bu: pre-allocated bulk-read information 1050 * 1051 * @write_reserve_mutex: protects @write_reserve_buf 1052 * @write_reserve_buf: on the write path we allocate memory, which might 1053 * sometimes be unavailable, in which case we use this 1054 * write reserve buffer 1055 * 1056 * @log_lebs: number of logical eraseblocks in the log 1057 * @log_bytes: log size in bytes 1058 * @log_last: last LEB of the log 1059 * @lpt_lebs: number of LEBs used for lprops table 1060 * @lpt_first: first LEB of the lprops table area 1061 * @lpt_last: last LEB of the lprops table area 1062 * @orph_lebs: number of LEBs used for the orphan area 1063 * @orph_first: first LEB of the orphan area 1064 * @orph_last: last LEB of the orphan area 1065 * @main_lebs: count of LEBs in the main area 1066 * @main_first: first LEB of the main area 1067 * @main_bytes: main area size in bytes 1068 * 1069 * @key_hash_type: type of the key hash 1070 * @key_hash: direntry key hash function 1071 * @key_fmt: key format 1072 * @key_len: key length 1073 * @fanout: fanout of the index tree (number of links per indexing node) 1074 * 1075 * @min_io_size: minimal input/output unit size 1076 * @min_io_shift: number of bits in @min_io_size minus one 1077 * @max_write_size: maximum amount of bytes the underlying flash can write at a 1078 * time (MTD write buffer size) 1079 * @max_write_shift: number of bits in @max_write_size minus one 1080 * @leb_size: logical eraseblock size in bytes 1081 * @leb_start: starting offset of logical eraseblocks within physical 1082 * eraseblocks 1083 * @half_leb_size: half LEB size 1084 * @idx_leb_size: how many bytes of an LEB are effectively available when it is 1085 * used to store indexing nodes (@leb_size - @max_idx_node_sz) 1086 * @leb_cnt: count of logical eraseblocks 1087 * @max_leb_cnt: maximum count of logical eraseblocks 1088 * @old_leb_cnt: count of logical eraseblocks before re-size 1089 * @ro_media: the underlying UBI volume is read-only 1090 * @ro_mount: the file-system was mounted as read-only 1091 * @ro_error: UBIFS switched to R/O mode because an error happened 1092 * 1093 * @dirty_pg_cnt: number of dirty pages (not used) 1094 * @dirty_zn_cnt: number of dirty znodes 1095 * @clean_zn_cnt: number of clean znodes 1096 * 1097 * @space_lock: protects @bi and @lst 1098 * @lst: lprops statistics 1099 * @bi: budgeting information 1100 * @calc_idx_sz: temporary variable which is used to calculate new index size 1101 * (contains accurate new index size at end of TNC commit start) 1102 * 1103 * @ref_node_alsz: size of the LEB reference node aligned to the min. flash 1104 * I/O unit 1105 * @mst_node_alsz: master node aligned size 1106 * @min_idx_node_sz: minimum indexing node aligned on 8-bytes boundary 1107 * @max_idx_node_sz: maximum indexing node aligned on 8-bytes boundary 1108 * @max_inode_sz: maximum possible inode size in bytes 1109 * @max_znode_sz: size of znode in bytes 1110 * 1111 * @leb_overhead: how many bytes are wasted in an LEB when it is filled with 1112 * data nodes of maximum size - used in free space reporting 1113 * @dead_wm: LEB dead space watermark 1114 * @dark_wm: LEB dark space watermark 1115 * @block_cnt: count of 4KiB blocks on the FS 1116 * 1117 * @ranges: UBIFS node length ranges 1118 * @ubi: UBI volume descriptor 1119 * @di: UBI device information 1120 * @vi: UBI volume information 1121 * 1122 * @orph_tree: rb-tree of orphan inode numbers 1123 * @orph_list: list of orphan inode numbers in order added 1124 * @orph_new: list of orphan inode numbers added since last commit 1125 * @orph_cnext: next orphan to commit 1126 * @orph_dnext: next orphan to delete 1127 * @orphan_lock: lock for orph_tree and orph_new 1128 * @orph_buf: buffer for orphan nodes 1129 * @new_orphans: number of orphans since last commit 1130 * @cmt_orphans: number of orphans being committed 1131 * @tot_orphans: number of orphans in the rb_tree 1132 * @max_orphans: maximum number of orphans allowed 1133 * @ohead_lnum: orphan head LEB number 1134 * @ohead_offs: orphan head offset 1135 * @no_orphs: non-zero if there are no orphans 1136 * 1137 * @bgt: UBIFS background thread 1138 * @bgt_name: background thread name 1139 * @need_bgt: if background thread should run 1140 * @need_wbuf_sync: if write-buffers have to be synchronized 1141 * 1142 * @gc_lnum: LEB number used for garbage collection 1143 * @sbuf: a buffer of LEB size used by GC and replay for scanning 1144 * @idx_gc: list of index LEBs that have been garbage collected 1145 * @idx_gc_cnt: number of elements on the idx_gc list 1146 * @gc_seq: incremented for every non-index LEB garbage collected 1147 * @gced_lnum: last non-index LEB that was garbage collected 1148 * 1149 * @infos_list: links all 'ubifs_info' objects 1150 * @umount_mutex: serializes shrinker and un-mount 1151 * @shrinker_run_no: shrinker run number 1152 * 1153 * @space_bits: number of bits needed to record free or dirty space 1154 * @lpt_lnum_bits: number of bits needed to record a LEB number in the LPT 1155 * @lpt_offs_bits: number of bits needed to record an offset in the LPT 1156 * @lpt_spc_bits: number of bits needed to space in the LPT 1157 * @pcnt_bits: number of bits needed to record pnode or nnode number 1158 * @lnum_bits: number of bits needed to record LEB number 1159 * @nnode_sz: size of on-flash nnode 1160 * @pnode_sz: size of on-flash pnode 1161 * @ltab_sz: size of on-flash LPT lprops table 1162 * @lsave_sz: size of on-flash LPT save table 1163 * @pnode_cnt: number of pnodes 1164 * @nnode_cnt: number of nnodes 1165 * @lpt_hght: height of the LPT 1166 * @pnodes_have: number of pnodes in memory 1167 * 1168 * @lp_mutex: protects lprops table and all the other lprops-related fields 1169 * @lpt_lnum: LEB number of the root nnode of the LPT 1170 * @lpt_offs: offset of the root nnode of the LPT 1171 * @nhead_lnum: LEB number of LPT head 1172 * @nhead_offs: offset of LPT head 1173 * @lpt_drty_flgs: dirty flags for LPT special nodes e.g. ltab 1174 * @dirty_nn_cnt: number of dirty nnodes 1175 * @dirty_pn_cnt: number of dirty pnodes 1176 * @check_lpt_free: flag that indicates LPT GC may be needed 1177 * @lpt_sz: LPT size 1178 * @lpt_nod_buf: buffer for an on-flash nnode or pnode 1179 * @lpt_buf: buffer of LEB size used by LPT 1180 * @nroot: address in memory of the root nnode of the LPT 1181 * @lpt_cnext: next LPT node to commit 1182 * @lpt_heap: array of heaps of categorized lprops 1183 * @dirty_idx: a (reverse sorted) copy of the LPROPS_DIRTY_IDX heap as at 1184 * previous commit start 1185 * @uncat_list: list of un-categorized LEBs 1186 * @empty_list: list of empty LEBs 1187 * @freeable_list: list of freeable non-index LEBs (free + dirty == @leb_size) 1188 * @frdi_idx_list: list of freeable index LEBs (free + dirty == @leb_size) 1189 * @freeable_cnt: number of freeable LEBs in @freeable_list 1190 * @in_a_category_cnt: count of lprops which are in a certain category, which 1191 * basically meants that they were loaded from the flash 1192 * 1193 * @ltab_lnum: LEB number of LPT's own lprops table 1194 * @ltab_offs: offset of LPT's own lprops table 1195 * @ltab: LPT's own lprops table 1196 * @ltab_cmt: LPT's own lprops table (commit copy) 1197 * @lsave_cnt: number of LEB numbers in LPT's save table 1198 * @lsave_lnum: LEB number of LPT's save table 1199 * @lsave_offs: offset of LPT's save table 1200 * @lsave: LPT's save table 1201 * @lscan_lnum: LEB number of last LPT scan 1202 * 1203 * @rp_size: size of the reserved pool in bytes 1204 * @report_rp_size: size of the reserved pool reported to user-space 1205 * @rp_uid: reserved pool user ID 1206 * @rp_gid: reserved pool group ID 1207 * 1208 * @empty: %1 if the UBI device is empty 1209 * @need_recovery: %1 if the file-system needs recovery 1210 * @replaying: %1 during journal replay 1211 * @mounting: %1 while mounting 1212 * @remounting_rw: %1 while re-mounting from R/O mode to R/W mode 1213 * @replay_list: temporary list used during journal replay 1214 * @replay_buds: list of buds to replay 1215 * @cs_sqnum: sequence number of first node in the log (commit start node) 1216 * @replay_sqnum: sequence number of node currently being replayed 1217 * @unclean_leb_list: LEBs to recover when re-mounting R/O mounted FS to R/W 1218 * mode 1219 * @rcvrd_mst_node: recovered master node to write when re-mounting R/O mounted 1220 * FS to R/W mode 1221 * @size_tree: inode size information for recovery 1222 * @mount_opts: UBIFS-specific mount options 1223 * 1224 * @dbg: debugging-related information 1225 */ 1226 struct ubifs_info { 1227 struct super_block *vfs_sb; 1228 struct backing_dev_info bdi; 1229 1230 ino_t highest_inum; 1231 unsigned long long max_sqnum; 1232 unsigned long long cmt_no; 1233 spinlock_t cnt_lock; 1234 int fmt_version; 1235 int ro_compat_version; 1236 unsigned char uuid[16]; 1237 1238 int lhead_lnum; 1239 int lhead_offs; 1240 int ltail_lnum; 1241 struct mutex log_mutex; 1242 int min_log_bytes; 1243 long long cmt_bud_bytes; 1244 1245 struct rb_root buds; 1246 long long bud_bytes; 1247 spinlock_t buds_lock; 1248 int jhead_cnt; 1249 struct ubifs_jhead *jheads; 1250 long long max_bud_bytes; 1251 long long bg_bud_bytes; 1252 struct list_head old_buds; 1253 int max_bud_cnt; 1254 1255 struct rw_semaphore commit_sem; 1256 int cmt_state; 1257 spinlock_t cs_lock; 1258 wait_queue_head_t cmt_wq; 1259 1260 unsigned int big_lpt:1; 1261 unsigned int space_fixup:1; 1262 unsigned int no_chk_data_crc:1; 1263 unsigned int bulk_read:1; 1264 unsigned int default_compr:2; 1265 unsigned int rw_incompat:1; 1266 1267 struct mutex tnc_mutex; 1268 struct ubifs_zbranch zroot; 1269 struct ubifs_znode *cnext; 1270 struct ubifs_znode *enext; 1271 int *gap_lebs; 1272 void *cbuf; 1273 void *ileb_buf; 1274 int ileb_len; 1275 int ihead_lnum; 1276 int ihead_offs; 1277 int *ilebs; 1278 int ileb_cnt; 1279 int ileb_nxt; 1280 struct rb_root old_idx; 1281 int *bottom_up_buf; 1282 1283 struct ubifs_mst_node *mst_node; 1284 int mst_offs; 1285 struct mutex mst_mutex; 1286 1287 int max_bu_buf_len; 1288 struct mutex bu_mutex; 1289 struct bu_info bu; 1290 1291 struct mutex write_reserve_mutex; 1292 void *write_reserve_buf; 1293 1294 int log_lebs; 1295 long long log_bytes; 1296 int log_last; 1297 int lpt_lebs; 1298 int lpt_first; 1299 int lpt_last; 1300 int orph_lebs; 1301 int orph_first; 1302 int orph_last; 1303 int main_lebs; 1304 int main_first; 1305 long long main_bytes; 1306 1307 uint8_t key_hash_type; 1308 uint32_t (*key_hash)(const char *str, int len); 1309 int key_fmt; 1310 int key_len; 1311 int fanout; 1312 1313 int min_io_size; 1314 int min_io_shift; 1315 int max_write_size; 1316 int max_write_shift; 1317 int leb_size; 1318 int leb_start; 1319 int half_leb_size; 1320 int idx_leb_size; 1321 int leb_cnt; 1322 int max_leb_cnt; 1323 int old_leb_cnt; 1324 unsigned int ro_media:1; 1325 unsigned int ro_mount:1; 1326 unsigned int ro_error:1; 1327 1328 atomic_long_t dirty_pg_cnt; 1329 atomic_long_t dirty_zn_cnt; 1330 atomic_long_t clean_zn_cnt; 1331 1332 spinlock_t space_lock; 1333 struct ubifs_lp_stats lst; 1334 struct ubifs_budg_info bi; 1335 unsigned long long calc_idx_sz; 1336 1337 int ref_node_alsz; 1338 int mst_node_alsz; 1339 int min_idx_node_sz; 1340 int max_idx_node_sz; 1341 long long max_inode_sz; 1342 int max_znode_sz; 1343 1344 int leb_overhead; 1345 int dead_wm; 1346 int dark_wm; 1347 int block_cnt; 1348 1349 struct ubifs_node_range ranges[UBIFS_NODE_TYPES_CNT]; 1350 struct ubi_volume_desc *ubi; 1351 struct ubi_device_info di; 1352 struct ubi_volume_info vi; 1353 1354 struct rb_root orph_tree; 1355 struct list_head orph_list; 1356 struct list_head orph_new; 1357 struct ubifs_orphan *orph_cnext; 1358 struct ubifs_orphan *orph_dnext; 1359 spinlock_t orphan_lock; 1360 void *orph_buf; 1361 int new_orphans; 1362 int cmt_orphans; 1363 int tot_orphans; 1364 int max_orphans; 1365 int ohead_lnum; 1366 int ohead_offs; 1367 int no_orphs; 1368 1369 struct task_struct *bgt; 1370 char bgt_name[sizeof(BGT_NAME_PATTERN) + 9]; 1371 int need_bgt; 1372 int need_wbuf_sync; 1373 1374 int gc_lnum; 1375 void *sbuf; 1376 struct list_head idx_gc; 1377 int idx_gc_cnt; 1378 int gc_seq; 1379 int gced_lnum; 1380 1381 struct list_head infos_list; 1382 struct mutex umount_mutex; 1383 unsigned int shrinker_run_no; 1384 1385 int space_bits; 1386 int lpt_lnum_bits; 1387 int lpt_offs_bits; 1388 int lpt_spc_bits; 1389 int pcnt_bits; 1390 int lnum_bits; 1391 int nnode_sz; 1392 int pnode_sz; 1393 int ltab_sz; 1394 int lsave_sz; 1395 int pnode_cnt; 1396 int nnode_cnt; 1397 int lpt_hght; 1398 int pnodes_have; 1399 1400 struct mutex lp_mutex; 1401 int lpt_lnum; 1402 int lpt_offs; 1403 int nhead_lnum; 1404 int nhead_offs; 1405 int lpt_drty_flgs; 1406 int dirty_nn_cnt; 1407 int dirty_pn_cnt; 1408 int check_lpt_free; 1409 long long lpt_sz; 1410 void *lpt_nod_buf; 1411 void *lpt_buf; 1412 struct ubifs_nnode *nroot; 1413 struct ubifs_cnode *lpt_cnext; 1414 struct ubifs_lpt_heap lpt_heap[LPROPS_HEAP_CNT]; 1415 struct ubifs_lpt_heap dirty_idx; 1416 struct list_head uncat_list; 1417 struct list_head empty_list; 1418 struct list_head freeable_list; 1419 struct list_head frdi_idx_list; 1420 int freeable_cnt; 1421 int in_a_category_cnt; 1422 1423 int ltab_lnum; 1424 int ltab_offs; 1425 struct ubifs_lpt_lprops *ltab; 1426 struct ubifs_lpt_lprops *ltab_cmt; 1427 int lsave_cnt; 1428 int lsave_lnum; 1429 int lsave_offs; 1430 int *lsave; 1431 int lscan_lnum; 1432 1433 long long rp_size; 1434 long long report_rp_size; 1435 kuid_t rp_uid; 1436 kgid_t rp_gid; 1437 1438 /* The below fields are used only during mounting and re-mounting */ 1439 unsigned int empty:1; 1440 unsigned int need_recovery:1; 1441 unsigned int replaying:1; 1442 unsigned int mounting:1; 1443 unsigned int remounting_rw:1; 1444 struct list_head replay_list; 1445 struct list_head replay_buds; 1446 unsigned long long cs_sqnum; 1447 unsigned long long replay_sqnum; 1448 struct list_head unclean_leb_list; 1449 struct ubifs_mst_node *rcvrd_mst_node; 1450 struct rb_root size_tree; 1451 struct ubifs_mount_opts mount_opts; 1452 1453 struct ubifs_debug_info *dbg; 1454 }; 1455 1456 extern struct list_head ubifs_infos; 1457 extern spinlock_t ubifs_infos_lock; 1458 extern atomic_long_t ubifs_clean_zn_cnt; 1459 extern struct kmem_cache *ubifs_inode_slab; 1460 extern const struct super_operations ubifs_super_operations; 1461 extern const struct address_space_operations ubifs_file_address_operations; 1462 extern const struct file_operations ubifs_file_operations; 1463 extern const struct inode_operations ubifs_file_inode_operations; 1464 extern const struct file_operations ubifs_dir_operations; 1465 extern const struct inode_operations ubifs_dir_inode_operations; 1466 extern const struct inode_operations ubifs_symlink_inode_operations; 1467 extern struct backing_dev_info ubifs_backing_dev_info; 1468 extern struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT]; 1469 1470 /* io.c */ 1471 void ubifs_ro_mode(struct ubifs_info *c, int err); 1472 int ubifs_leb_read(const struct ubifs_info *c, int lnum, void *buf, int offs, 1473 int len, int even_ebadmsg); 1474 int ubifs_leb_write(struct ubifs_info *c, int lnum, const void *buf, int offs, 1475 int len); 1476 int ubifs_leb_change(struct ubifs_info *c, int lnum, const void *buf, int len); 1477 int ubifs_leb_unmap(struct ubifs_info *c, int lnum); 1478 int ubifs_leb_map(struct ubifs_info *c, int lnum); 1479 int ubifs_is_mapped(const struct ubifs_info *c, int lnum); 1480 int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len); 1481 int ubifs_wbuf_seek_nolock(struct ubifs_wbuf *wbuf, int lnum, int offs); 1482 int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf); 1483 int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len, 1484 int lnum, int offs); 1485 int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len, 1486 int lnum, int offs); 1487 int ubifs_write_node(struct ubifs_info *c, void *node, int len, int lnum, 1488 int offs); 1489 int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum, 1490 int offs, int quiet, int must_chk_crc); 1491 void ubifs_prepare_node(struct ubifs_info *c, void *buf, int len, int pad); 1492 void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last); 1493 int ubifs_io_init(struct ubifs_info *c); 1494 void ubifs_pad(const struct ubifs_info *c, void *buf, int pad); 1495 int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf); 1496 int ubifs_bg_wbufs_sync(struct ubifs_info *c); 1497 void ubifs_wbuf_add_ino_nolock(struct ubifs_wbuf *wbuf, ino_t inum); 1498 int ubifs_sync_wbufs_by_inode(struct ubifs_info *c, struct inode *inode); 1499 1500 /* scan.c */ 1501 struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum, 1502 int offs, void *sbuf, int quiet); 1503 void ubifs_scan_destroy(struct ubifs_scan_leb *sleb); 1504 int ubifs_scan_a_node(const struct ubifs_info *c, void *buf, int len, int lnum, 1505 int offs, int quiet); 1506 struct ubifs_scan_leb *ubifs_start_scan(const struct ubifs_info *c, int lnum, 1507 int offs, void *sbuf); 1508 void ubifs_end_scan(const struct ubifs_info *c, struct ubifs_scan_leb *sleb, 1509 int lnum, int offs); 1510 int ubifs_add_snod(const struct ubifs_info *c, struct ubifs_scan_leb *sleb, 1511 void *buf, int offs); 1512 void ubifs_scanned_corruption(const struct ubifs_info *c, int lnum, int offs, 1513 void *buf); 1514 1515 /* log.c */ 1516 void ubifs_add_bud(struct ubifs_info *c, struct ubifs_bud *bud); 1517 void ubifs_create_buds_lists(struct ubifs_info *c); 1518 int ubifs_add_bud_to_log(struct ubifs_info *c, int jhead, int lnum, int offs); 1519 struct ubifs_bud *ubifs_search_bud(struct ubifs_info *c, int lnum); 1520 struct ubifs_wbuf *ubifs_get_wbuf(struct ubifs_info *c, int lnum); 1521 int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum); 1522 int ubifs_log_end_commit(struct ubifs_info *c, int new_ltail_lnum); 1523 int ubifs_log_post_commit(struct ubifs_info *c, int old_ltail_lnum); 1524 int ubifs_consolidate_log(struct ubifs_info *c); 1525 1526 /* journal.c */ 1527 int ubifs_jnl_update(struct ubifs_info *c, const struct inode *dir, 1528 const struct qstr *nm, const struct inode *inode, 1529 int deletion, int xent); 1530 int ubifs_jnl_write_data(struct ubifs_info *c, const struct inode *inode, 1531 const union ubifs_key *key, const void *buf, int len); 1532 int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode); 1533 int ubifs_jnl_delete_inode(struct ubifs_info *c, const struct inode *inode); 1534 int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir, 1535 const struct dentry *old_dentry, 1536 const struct inode *new_dir, 1537 const struct dentry *new_dentry, int sync); 1538 int ubifs_jnl_truncate(struct ubifs_info *c, const struct inode *inode, 1539 loff_t old_size, loff_t new_size); 1540 int ubifs_jnl_delete_xattr(struct ubifs_info *c, const struct inode *host, 1541 const struct inode *inode, const struct qstr *nm); 1542 int ubifs_jnl_change_xattr(struct ubifs_info *c, const struct inode *inode1, 1543 const struct inode *inode2); 1544 1545 /* budget.c */ 1546 int ubifs_budget_space(struct ubifs_info *c, struct ubifs_budget_req *req); 1547 void ubifs_release_budget(struct ubifs_info *c, struct ubifs_budget_req *req); 1548 void ubifs_release_dirty_inode_budget(struct ubifs_info *c, 1549 struct ubifs_inode *ui); 1550 int ubifs_budget_inode_op(struct ubifs_info *c, struct inode *inode, 1551 struct ubifs_budget_req *req); 1552 void ubifs_release_ino_dirty(struct ubifs_info *c, struct inode *inode, 1553 struct ubifs_budget_req *req); 1554 void ubifs_cancel_ino_op(struct ubifs_info *c, struct inode *inode, 1555 struct ubifs_budget_req *req); 1556 long long ubifs_get_free_space(struct ubifs_info *c); 1557 long long ubifs_get_free_space_nolock(struct ubifs_info *c); 1558 int ubifs_calc_min_idx_lebs(struct ubifs_info *c); 1559 void ubifs_convert_page_budget(struct ubifs_info *c); 1560 long long ubifs_reported_space(const struct ubifs_info *c, long long free); 1561 long long ubifs_calc_available(const struct ubifs_info *c, int min_idx_lebs); 1562 1563 /* find.c */ 1564 int ubifs_find_free_space(struct ubifs_info *c, int min_space, int *offs, 1565 int squeeze); 1566 int ubifs_find_free_leb_for_idx(struct ubifs_info *c); 1567 int ubifs_find_dirty_leb(struct ubifs_info *c, struct ubifs_lprops *ret_lp, 1568 int min_space, int pick_free); 1569 int ubifs_find_dirty_idx_leb(struct ubifs_info *c); 1570 int ubifs_save_dirty_idx_lnums(struct ubifs_info *c); 1571 1572 /* tnc.c */ 1573 int ubifs_lookup_level0(struct ubifs_info *c, const union ubifs_key *key, 1574 struct ubifs_znode **zn, int *n); 1575 int ubifs_tnc_lookup_nm(struct ubifs_info *c, const union ubifs_key *key, 1576 void *node, const struct qstr *nm); 1577 int ubifs_tnc_locate(struct ubifs_info *c, const union ubifs_key *key, 1578 void *node, int *lnum, int *offs); 1579 int ubifs_tnc_add(struct ubifs_info *c, const union ubifs_key *key, int lnum, 1580 int offs, int len); 1581 int ubifs_tnc_replace(struct ubifs_info *c, const union ubifs_key *key, 1582 int old_lnum, int old_offs, int lnum, int offs, int len); 1583 int ubifs_tnc_add_nm(struct ubifs_info *c, const union ubifs_key *key, 1584 int lnum, int offs, int len, const struct qstr *nm); 1585 int ubifs_tnc_remove(struct ubifs_info *c, const union ubifs_key *key); 1586 int ubifs_tnc_remove_nm(struct ubifs_info *c, const union ubifs_key *key, 1587 const struct qstr *nm); 1588 int ubifs_tnc_remove_range(struct ubifs_info *c, union ubifs_key *from_key, 1589 union ubifs_key *to_key); 1590 int ubifs_tnc_remove_ino(struct ubifs_info *c, ino_t inum); 1591 struct ubifs_dent_node *ubifs_tnc_next_ent(struct ubifs_info *c, 1592 union ubifs_key *key, 1593 const struct qstr *nm); 1594 void ubifs_tnc_close(struct ubifs_info *c); 1595 int ubifs_tnc_has_node(struct ubifs_info *c, union ubifs_key *key, int level, 1596 int lnum, int offs, int is_idx); 1597 int ubifs_dirty_idx_node(struct ubifs_info *c, union ubifs_key *key, int level, 1598 int lnum, int offs); 1599 /* Shared by tnc.c for tnc_commit.c */ 1600 void destroy_old_idx(struct ubifs_info *c); 1601 int is_idx_node_in_tnc(struct ubifs_info *c, union ubifs_key *key, int level, 1602 int lnum, int offs); 1603 int insert_old_idx_znode(struct ubifs_info *c, struct ubifs_znode *znode); 1604 int ubifs_tnc_get_bu_keys(struct ubifs_info *c, struct bu_info *bu); 1605 int ubifs_tnc_bulk_read(struct ubifs_info *c, struct bu_info *bu); 1606 1607 /* tnc_misc.c */ 1608 struct ubifs_znode *ubifs_tnc_levelorder_next(struct ubifs_znode *zr, 1609 struct ubifs_znode *znode); 1610 int ubifs_search_zbranch(const struct ubifs_info *c, 1611 const struct ubifs_znode *znode, 1612 const union ubifs_key *key, int *n); 1613 struct ubifs_znode *ubifs_tnc_postorder_first(struct ubifs_znode *znode); 1614 struct ubifs_znode *ubifs_tnc_postorder_next(struct ubifs_znode *znode); 1615 long ubifs_destroy_tnc_subtree(struct ubifs_znode *zr); 1616 struct ubifs_znode *ubifs_load_znode(struct ubifs_info *c, 1617 struct ubifs_zbranch *zbr, 1618 struct ubifs_znode *parent, int iip); 1619 int ubifs_tnc_read_node(struct ubifs_info *c, struct ubifs_zbranch *zbr, 1620 void *node); 1621 1622 /* tnc_commit.c */ 1623 int ubifs_tnc_start_commit(struct ubifs_info *c, struct ubifs_zbranch *zroot); 1624 int ubifs_tnc_end_commit(struct ubifs_info *c); 1625 1626 /* shrinker.c */ 1627 int ubifs_shrinker(struct shrinker *shrink, struct shrink_control *sc); 1628 1629 /* commit.c */ 1630 int ubifs_bg_thread(void *info); 1631 void ubifs_commit_required(struct ubifs_info *c); 1632 void ubifs_request_bg_commit(struct ubifs_info *c); 1633 int ubifs_run_commit(struct ubifs_info *c); 1634 void ubifs_recovery_commit(struct ubifs_info *c); 1635 int ubifs_gc_should_commit(struct ubifs_info *c); 1636 void ubifs_wait_for_commit(struct ubifs_info *c); 1637 1638 /* master.c */ 1639 int ubifs_read_master(struct ubifs_info *c); 1640 int ubifs_write_master(struct ubifs_info *c); 1641 1642 /* sb.c */ 1643 int ubifs_read_superblock(struct ubifs_info *c); 1644 struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c); 1645 int ubifs_write_sb_node(struct ubifs_info *c, struct ubifs_sb_node *sup); 1646 int ubifs_fixup_free_space(struct ubifs_info *c); 1647 1648 /* replay.c */ 1649 int ubifs_validate_entry(struct ubifs_info *c, 1650 const struct ubifs_dent_node *dent); 1651 int ubifs_replay_journal(struct ubifs_info *c); 1652 1653 /* gc.c */ 1654 int ubifs_garbage_collect(struct ubifs_info *c, int anyway); 1655 int ubifs_gc_start_commit(struct ubifs_info *c); 1656 int ubifs_gc_end_commit(struct ubifs_info *c); 1657 void ubifs_destroy_idx_gc(struct ubifs_info *c); 1658 int ubifs_get_idx_gc_leb(struct ubifs_info *c); 1659 int ubifs_garbage_collect_leb(struct ubifs_info *c, struct ubifs_lprops *lp); 1660 1661 /* orphan.c */ 1662 int ubifs_add_orphan(struct ubifs_info *c, ino_t inum); 1663 void ubifs_delete_orphan(struct ubifs_info *c, ino_t inum); 1664 int ubifs_orphan_start_commit(struct ubifs_info *c); 1665 int ubifs_orphan_end_commit(struct ubifs_info *c); 1666 int ubifs_mount_orphans(struct ubifs_info *c, int unclean, int read_only); 1667 int ubifs_clear_orphans(struct ubifs_info *c); 1668 1669 /* lpt.c */ 1670 int ubifs_calc_lpt_geom(struct ubifs_info *c); 1671 int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first, 1672 int *lpt_lebs, int *big_lpt); 1673 int ubifs_lpt_init(struct ubifs_info *c, int rd, int wr); 1674 struct ubifs_lprops *ubifs_lpt_lookup(struct ubifs_info *c, int lnum); 1675 struct ubifs_lprops *ubifs_lpt_lookup_dirty(struct ubifs_info *c, int lnum); 1676 int ubifs_lpt_scan_nolock(struct ubifs_info *c, int start_lnum, int end_lnum, 1677 ubifs_lpt_scan_callback scan_cb, void *data); 1678 1679 /* Shared by lpt.c for lpt_commit.c */ 1680 void ubifs_pack_lsave(struct ubifs_info *c, void *buf, int *lsave); 1681 void ubifs_pack_ltab(struct ubifs_info *c, void *buf, 1682 struct ubifs_lpt_lprops *ltab); 1683 void ubifs_pack_pnode(struct ubifs_info *c, void *buf, 1684 struct ubifs_pnode *pnode); 1685 void ubifs_pack_nnode(struct ubifs_info *c, void *buf, 1686 struct ubifs_nnode *nnode); 1687 struct ubifs_pnode *ubifs_get_pnode(struct ubifs_info *c, 1688 struct ubifs_nnode *parent, int iip); 1689 struct ubifs_nnode *ubifs_get_nnode(struct ubifs_info *c, 1690 struct ubifs_nnode *parent, int iip); 1691 int ubifs_read_nnode(struct ubifs_info *c, struct ubifs_nnode *parent, int iip); 1692 void ubifs_add_lpt_dirt(struct ubifs_info *c, int lnum, int dirty); 1693 void ubifs_add_nnode_dirt(struct ubifs_info *c, struct ubifs_nnode *nnode); 1694 uint32_t ubifs_unpack_bits(uint8_t **addr, int *pos, int nrbits); 1695 struct ubifs_nnode *ubifs_first_nnode(struct ubifs_info *c, int *hght); 1696 /* Needed only in debugging code in lpt_commit.c */ 1697 int ubifs_unpack_nnode(const struct ubifs_info *c, void *buf, 1698 struct ubifs_nnode *nnode); 1699 1700 /* lpt_commit.c */ 1701 int ubifs_lpt_start_commit(struct ubifs_info *c); 1702 int ubifs_lpt_end_commit(struct ubifs_info *c); 1703 int ubifs_lpt_post_commit(struct ubifs_info *c); 1704 void ubifs_lpt_free(struct ubifs_info *c, int wr_only); 1705 1706 /* lprops.c */ 1707 const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c, 1708 const struct ubifs_lprops *lp, 1709 int free, int dirty, int flags, 1710 int idx_gc_cnt); 1711 void ubifs_get_lp_stats(struct ubifs_info *c, struct ubifs_lp_stats *lst); 1712 void ubifs_add_to_cat(struct ubifs_info *c, struct ubifs_lprops *lprops, 1713 int cat); 1714 void ubifs_replace_cat(struct ubifs_info *c, struct ubifs_lprops *old_lprops, 1715 struct ubifs_lprops *new_lprops); 1716 void ubifs_ensure_cat(struct ubifs_info *c, struct ubifs_lprops *lprops); 1717 int ubifs_categorize_lprops(const struct ubifs_info *c, 1718 const struct ubifs_lprops *lprops); 1719 int ubifs_change_one_lp(struct ubifs_info *c, int lnum, int free, int dirty, 1720 int flags_set, int flags_clean, int idx_gc_cnt); 1721 int ubifs_update_one_lp(struct ubifs_info *c, int lnum, int free, int dirty, 1722 int flags_set, int flags_clean); 1723 int ubifs_read_one_lp(struct ubifs_info *c, int lnum, struct ubifs_lprops *lp); 1724 const struct ubifs_lprops *ubifs_fast_find_free(struct ubifs_info *c); 1725 const struct ubifs_lprops *ubifs_fast_find_empty(struct ubifs_info *c); 1726 const struct ubifs_lprops *ubifs_fast_find_freeable(struct ubifs_info *c); 1727 const struct ubifs_lprops *ubifs_fast_find_frdi_idx(struct ubifs_info *c); 1728 int ubifs_calc_dark(const struct ubifs_info *c, int spc); 1729 1730 /* file.c */ 1731 int ubifs_fsync(struct file *file, loff_t start, loff_t end, int datasync); 1732 int ubifs_setattr(struct dentry *dentry, struct iattr *attr); 1733 1734 /* dir.c */ 1735 struct inode *ubifs_new_inode(struct ubifs_info *c, const struct inode *dir, 1736 umode_t mode); 1737 int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1738 struct kstat *stat); 1739 1740 /* xattr.c */ 1741 int ubifs_setxattr(struct dentry *dentry, const char *name, 1742 const void *value, size_t size, int flags); 1743 ssize_t ubifs_getxattr(struct dentry *dentry, const char *name, void *buf, 1744 size_t size); 1745 ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size); 1746 int ubifs_removexattr(struct dentry *dentry, const char *name); 1747 1748 /* super.c */ 1749 struct inode *ubifs_iget(struct super_block *sb, unsigned long inum); 1750 1751 /* recovery.c */ 1752 int ubifs_recover_master_node(struct ubifs_info *c); 1753 int ubifs_write_rcvrd_mst_node(struct ubifs_info *c); 1754 struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum, 1755 int offs, void *sbuf, int jhead); 1756 struct ubifs_scan_leb *ubifs_recover_log_leb(struct ubifs_info *c, int lnum, 1757 int offs, void *sbuf); 1758 int ubifs_recover_inl_heads(struct ubifs_info *c, void *sbuf); 1759 int ubifs_clean_lebs(struct ubifs_info *c, void *sbuf); 1760 int ubifs_rcvry_gc_commit(struct ubifs_info *c); 1761 int ubifs_recover_size_accum(struct ubifs_info *c, union ubifs_key *key, 1762 int deletion, loff_t new_size); 1763 int ubifs_recover_size(struct ubifs_info *c); 1764 void ubifs_destroy_size_tree(struct ubifs_info *c); 1765 1766 /* ioctl.c */ 1767 long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 1768 void ubifs_set_inode_flags(struct inode *inode); 1769 #ifdef CONFIG_COMPAT 1770 long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 1771 #endif 1772 1773 /* compressor.c */ 1774 int __init ubifs_compressors_init(void); 1775 void ubifs_compressors_exit(void); 1776 void ubifs_compress(const void *in_buf, int in_len, void *out_buf, int *out_len, 1777 int *compr_type); 1778 int ubifs_decompress(const void *buf, int len, void *out, int *out_len, 1779 int compr_type); 1780 1781 #include "debug.h" 1782 #include "misc.h" 1783 #include "key.h" 1784 1785 #endif /* !__UBIFS_H__ */ 1786