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, ...) \ 46 printk(KERN_NOTICE "UBIFS: " fmt "\n", ##__VA_ARGS__) 47 /* UBIFS error messages */ 48 #define ubifs_err(fmt, ...) \ 49 printk(KERN_ERR "UBIFS error (pid %d): %s: " fmt "\n", current->pid, \ 50 __func__, ##__VA_ARGS__) 51 /* UBIFS warning messages */ 52 #define ubifs_warn(fmt, ...) \ 53 printk(KERN_WARNING "UBIFS warning (pid %d): %s: " fmt "\n", \ 54 current->pid, __func__, ##__VA_ARGS__) 55 56 /* UBIFS file system VFS magic number */ 57 #define UBIFS_SUPER_MAGIC 0x24051905 58 59 /* Number of UBIFS blocks per VFS page */ 60 #define UBIFS_BLOCKS_PER_PAGE (PAGE_CACHE_SIZE / UBIFS_BLOCK_SIZE) 61 #define UBIFS_BLOCKS_PER_PAGE_SHIFT (PAGE_CACHE_SHIFT - UBIFS_BLOCK_SHIFT) 62 63 /* "File system end of life" sequence number watermark */ 64 #define SQNUM_WARN_WATERMARK 0xFFFFFFFF00000000ULL 65 #define SQNUM_WATERMARK 0xFFFFFFFFFF000000ULL 66 67 /* 68 * Minimum amount of LEBs reserved for the index. At present the index needs at 69 * least 2 LEBs: one for the index head and one for in-the-gaps method (which 70 * currently does not cater for the index head and so excludes it from 71 * consideration). 72 */ 73 #define MIN_INDEX_LEBS 2 74 75 /* Minimum amount of data UBIFS writes to the flash */ 76 #define MIN_WRITE_SZ (UBIFS_DATA_NODE_SZ + 8) 77 78 /* 79 * Currently we do not support inode number overlapping and re-using, so this 80 * watermark defines dangerous inode number level. This should be fixed later, 81 * although it is difficult to exceed current limit. Another option is to use 82 * 64-bit inode numbers, but this means more overhead. 83 */ 84 #define INUM_WARN_WATERMARK 0xFFF00000 85 #define INUM_WATERMARK 0xFFFFFF00 86 87 /* Largest key size supported in this implementation */ 88 #define CUR_MAX_KEY_LEN UBIFS_SK_LEN 89 90 /* Maximum number of entries in each LPT (LEB category) heap */ 91 #define LPT_HEAP_SZ 256 92 93 /* 94 * Background thread name pattern. The numbers are UBI device and volume 95 * numbers. 96 */ 97 #define BGT_NAME_PATTERN "ubifs_bgt%d_%d" 98 99 /* Write-buffer synchronization timeout interval in seconds */ 100 #define WBUF_TIMEOUT_SOFTLIMIT 3 101 #define WBUF_TIMEOUT_HARDLIMIT 5 102 103 /* Maximum possible inode number (only 32-bit inodes are supported now) */ 104 #define MAX_INUM 0xFFFFFFFF 105 106 /* Number of non-data journal heads */ 107 #define NONDATA_JHEADS_CNT 2 108 109 /* Shorter names for journal head numbers for internal usage */ 110 #define GCHD UBIFS_GC_HEAD 111 #define BASEHD UBIFS_BASE_HEAD 112 #define DATAHD UBIFS_DATA_HEAD 113 114 /* 'No change' value for 'ubifs_change_lp()' */ 115 #define LPROPS_NC 0x80000001 116 117 /* 118 * There is no notion of truncation key because truncation nodes do not exist 119 * in TNC. However, when replaying, it is handy to introduce fake "truncation" 120 * keys for truncation nodes because the code becomes simpler. So we define 121 * %UBIFS_TRUN_KEY type. 122 * 123 * But otherwise, out of the journal reply scope, the truncation keys are 124 * invalid. 125 */ 126 #define UBIFS_TRUN_KEY UBIFS_KEY_TYPES_CNT 127 #define UBIFS_INVALID_KEY UBIFS_KEY_TYPES_CNT 128 129 /* 130 * How much a directory entry/extended attribute entry adds to the parent/host 131 * inode. 132 */ 133 #define CALC_DENT_SIZE(name_len) ALIGN(UBIFS_DENT_NODE_SZ + (name_len) + 1, 8) 134 135 /* How much an extended attribute adds to the host inode */ 136 #define CALC_XATTR_BYTES(data_len) ALIGN(UBIFS_INO_NODE_SZ + (data_len) + 1, 8) 137 138 /* 139 * Znodes which were not touched for 'OLD_ZNODE_AGE' seconds are considered 140 * "old", and znode which were touched last 'YOUNG_ZNODE_AGE' seconds ago are 141 * considered "young". This is used by shrinker when selecting znode to trim 142 * off. 143 */ 144 #define OLD_ZNODE_AGE 20 145 #define YOUNG_ZNODE_AGE 5 146 147 /* 148 * Some compressors, like LZO, may end up with more data then the input buffer. 149 * So UBIFS always allocates larger output buffer, to be sure the compressor 150 * will not corrupt memory in case of worst case compression. 151 */ 152 #define WORST_COMPR_FACTOR 2 153 154 /* 155 * How much memory is needed for a buffer where we comress a data node. 156 */ 157 #define COMPRESSED_DATA_NODE_BUF_SZ \ 158 (UBIFS_DATA_NODE_SZ + UBIFS_BLOCK_SIZE * WORST_COMPR_FACTOR) 159 160 /* Maximum expected tree height for use by bottom_up_buf */ 161 #define BOTTOM_UP_HEIGHT 64 162 163 /* Maximum number of data nodes to bulk-read */ 164 #define UBIFS_MAX_BULK_READ 32 165 166 /* 167 * Lockdep classes for UBIFS inode @ui_mutex. 168 */ 169 enum { 170 WB_MUTEX_1 = 0, 171 WB_MUTEX_2 = 1, 172 WB_MUTEX_3 = 2, 173 }; 174 175 /* 176 * Znode flags (actually, bit numbers which store the flags). 177 * 178 * DIRTY_ZNODE: znode is dirty 179 * COW_ZNODE: znode is being committed and a new instance of this znode has to 180 * be created before changing this znode 181 * OBSOLETE_ZNODE: znode is obsolete, which means it was deleted, but it is 182 * still in the commit list and the ongoing commit operation 183 * will commit it, and delete this znode after it is done 184 */ 185 enum { 186 DIRTY_ZNODE = 0, 187 COW_ZNODE = 1, 188 OBSOLETE_ZNODE = 2, 189 }; 190 191 /* 192 * Commit states. 193 * 194 * COMMIT_RESTING: commit is not wanted 195 * COMMIT_BACKGROUND: background commit has been requested 196 * COMMIT_REQUIRED: commit is required 197 * COMMIT_RUNNING_BACKGROUND: background commit is running 198 * COMMIT_RUNNING_REQUIRED: commit is running and it is required 199 * COMMIT_BROKEN: commit failed 200 */ 201 enum { 202 COMMIT_RESTING = 0, 203 COMMIT_BACKGROUND, 204 COMMIT_REQUIRED, 205 COMMIT_RUNNING_BACKGROUND, 206 COMMIT_RUNNING_REQUIRED, 207 COMMIT_BROKEN, 208 }; 209 210 /* 211 * 'ubifs_scan_a_node()' return values. 212 * 213 * SCANNED_GARBAGE: scanned garbage 214 * SCANNED_EMPTY_SPACE: scanned empty space 215 * SCANNED_A_NODE: scanned a valid node 216 * SCANNED_A_CORRUPT_NODE: scanned a corrupted node 217 * SCANNED_A_BAD_PAD_NODE: scanned a padding node with invalid pad length 218 * 219 * Greater than zero means: 'scanned that number of padding bytes' 220 */ 221 enum { 222 SCANNED_GARBAGE = 0, 223 SCANNED_EMPTY_SPACE = -1, 224 SCANNED_A_NODE = -2, 225 SCANNED_A_CORRUPT_NODE = -3, 226 SCANNED_A_BAD_PAD_NODE = -4, 227 }; 228 229 /* 230 * LPT cnode flag bits. 231 * 232 * DIRTY_CNODE: cnode is dirty 233 * OBSOLETE_CNODE: cnode is being committed and has been copied (or deleted), 234 * so it can (and must) be freed when the commit is finished 235 * COW_CNODE: cnode is being committed and must be copied before writing 236 */ 237 enum { 238 DIRTY_CNODE = 0, 239 OBSOLETE_CNODE = 1, 240 COW_CNODE = 2, 241 }; 242 243 /* 244 * Dirty flag bits (lpt_drty_flgs) for LPT special nodes. 245 * 246 * LTAB_DIRTY: ltab node is dirty 247 * LSAVE_DIRTY: lsave node is dirty 248 */ 249 enum { 250 LTAB_DIRTY = 1, 251 LSAVE_DIRTY = 2, 252 }; 253 254 /* 255 * Return codes used by the garbage collector. 256 * @LEB_FREED: the logical eraseblock was freed and is ready to use 257 * @LEB_FREED_IDX: indexing LEB was freed and can be used only after the commit 258 * @LEB_RETAINED: the logical eraseblock was freed and retained for GC purposes 259 */ 260 enum { 261 LEB_FREED, 262 LEB_FREED_IDX, 263 LEB_RETAINED, 264 }; 265 266 /** 267 * struct ubifs_old_idx - index node obsoleted since last commit start. 268 * @rb: rb-tree node 269 * @lnum: LEB number of obsoleted index node 270 * @offs: offset of obsoleted index node 271 */ 272 struct ubifs_old_idx { 273 struct rb_node rb; 274 int lnum; 275 int offs; 276 }; 277 278 /* The below union makes it easier to deal with keys */ 279 union ubifs_key { 280 uint8_t u8[CUR_MAX_KEY_LEN]; 281 uint32_t u32[CUR_MAX_KEY_LEN/4]; 282 uint64_t u64[CUR_MAX_KEY_LEN/8]; 283 __le32 j32[CUR_MAX_KEY_LEN/4]; 284 }; 285 286 /** 287 * struct ubifs_scan_node - UBIFS scanned node information. 288 * @list: list of scanned nodes 289 * @key: key of node scanned (if it has one) 290 * @sqnum: sequence number 291 * @type: type of node scanned 292 * @offs: offset with LEB of node scanned 293 * @len: length of node scanned 294 * @node: raw node 295 */ 296 struct ubifs_scan_node { 297 struct list_head list; 298 union ubifs_key key; 299 unsigned long long sqnum; 300 int type; 301 int offs; 302 int len; 303 void *node; 304 }; 305 306 /** 307 * struct ubifs_scan_leb - UBIFS scanned LEB information. 308 * @lnum: logical eraseblock number 309 * @nodes_cnt: number of nodes scanned 310 * @nodes: list of struct ubifs_scan_node 311 * @endpt: end point (and therefore the start of empty space) 312 * @ecc: read returned -EBADMSG 313 * @buf: buffer containing entire LEB scanned 314 */ 315 struct ubifs_scan_leb { 316 int lnum; 317 int nodes_cnt; 318 struct list_head nodes; 319 int endpt; 320 int ecc; 321 void *buf; 322 }; 323 324 /** 325 * struct ubifs_gced_idx_leb - garbage-collected indexing LEB. 326 * @list: list 327 * @lnum: LEB number 328 * @unmap: OK to unmap this LEB 329 * 330 * This data structure is used to temporary store garbage-collected indexing 331 * LEBs - they are not released immediately, but only after the next commit. 332 * This is needed to guarantee recoverability. 333 */ 334 struct ubifs_gced_idx_leb { 335 struct list_head list; 336 int lnum; 337 int unmap; 338 }; 339 340 /** 341 * struct ubifs_inode - UBIFS in-memory inode description. 342 * @vfs_inode: VFS inode description object 343 * @creat_sqnum: sequence number at time of creation 344 * @del_cmtno: commit number corresponding to the time the inode was deleted, 345 * protected by @c->commit_sem; 346 * @xattr_size: summarized size of all extended attributes in bytes 347 * @xattr_cnt: count of extended attributes this inode has 348 * @xattr_names: sum of lengths of all extended attribute names belonging to 349 * this inode 350 * @dirty: non-zero if the inode is dirty 351 * @xattr: non-zero if this is an extended attribute inode 352 * @bulk_read: non-zero if bulk-read should be used 353 * @ui_mutex: serializes inode write-back with the rest of VFS operations, 354 * serializes "clean <-> dirty" state changes, serializes bulk-read, 355 * protects @dirty, @bulk_read, @ui_size, and @xattr_size 356 * @ui_lock: protects @synced_i_size 357 * @synced_i_size: synchronized size of inode, i.e. the value of inode size 358 * currently stored on the flash; used only for regular file 359 * inodes 360 * @ui_size: inode size used by UBIFS when writing to flash 361 * @flags: inode flags (@UBIFS_COMPR_FL, etc) 362 * @compr_type: default compression type used for this inode 363 * @last_page_read: page number of last page read (for bulk read) 364 * @read_in_a_row: number of consecutive pages read in a row (for bulk read) 365 * @data_len: length of the data attached to the inode 366 * @data: inode's data 367 * 368 * @ui_mutex exists for two main reasons. At first it prevents inodes from 369 * being written back while UBIFS changing them, being in the middle of an VFS 370 * operation. This way UBIFS makes sure the inode fields are consistent. For 371 * example, in 'ubifs_rename()' we change 3 inodes simultaneously, and 372 * write-back must not write any of them before we have finished. 373 * 374 * The second reason is budgeting - UBIFS has to budget all operations. If an 375 * operation is going to mark an inode dirty, it has to allocate budget for 376 * this. It cannot just mark it dirty because there is no guarantee there will 377 * be enough flash space to write the inode back later. This means UBIFS has 378 * to have full control over inode "clean <-> dirty" transitions (and pages 379 * actually). But unfortunately, VFS marks inodes dirty in many places, and it 380 * does not ask the file-system if it is allowed to do so (there is a notifier, 381 * but it is not enough), i.e., there is no mechanism to synchronize with this. 382 * So UBIFS has its own inode dirty flag and its own mutex to serialize 383 * "clean <-> dirty" transitions. 384 * 385 * The @synced_i_size field is used to make sure we never write pages which are 386 * beyond last synchronized inode size. See 'ubifs_writepage()' for more 387 * information. 388 * 389 * The @ui_size is a "shadow" variable for @inode->i_size and UBIFS uses 390 * @ui_size instead of @inode->i_size. The reason for this is that UBIFS cannot 391 * make sure @inode->i_size is always changed under @ui_mutex, because it 392 * cannot call 'truncate_setsize()' with @ui_mutex locked, because it would 393 * deadlock with 'ubifs_writepage()' (see file.c). All the other inode fields 394 * are changed under @ui_mutex, so they do not need "shadow" fields. Note, one 395 * could consider to rework locking and base it on "shadow" fields. 396 */ 397 struct ubifs_inode { 398 struct inode vfs_inode; 399 unsigned long long creat_sqnum; 400 unsigned long long del_cmtno; 401 unsigned int xattr_size; 402 unsigned int xattr_cnt; 403 unsigned int xattr_names; 404 unsigned int dirty:1; 405 unsigned int xattr:1; 406 unsigned int bulk_read:1; 407 unsigned int compr_type:2; 408 struct mutex ui_mutex; 409 spinlock_t ui_lock; 410 loff_t synced_i_size; 411 loff_t ui_size; 412 int flags; 413 pgoff_t last_page_read; 414 pgoff_t read_in_a_row; 415 int data_len; 416 void *data; 417 }; 418 419 /** 420 * struct ubifs_unclean_leb - records a LEB recovered under read-only mode. 421 * @list: list 422 * @lnum: LEB number of recovered LEB 423 * @endpt: offset where recovery ended 424 * 425 * This structure records a LEB identified during recovery that needs to be 426 * cleaned but was not because UBIFS was mounted read-only. The information 427 * is used to clean the LEB when remounting to read-write mode. 428 */ 429 struct ubifs_unclean_leb { 430 struct list_head list; 431 int lnum; 432 int endpt; 433 }; 434 435 /* 436 * LEB properties flags. 437 * 438 * LPROPS_UNCAT: not categorized 439 * LPROPS_DIRTY: dirty > free, dirty >= @c->dead_wm, not index 440 * LPROPS_DIRTY_IDX: dirty + free > @c->min_idx_node_sze and index 441 * LPROPS_FREE: free > 0, dirty < @c->dead_wm, not empty, not index 442 * LPROPS_HEAP_CNT: number of heaps used for storing categorized LEBs 443 * LPROPS_EMPTY: LEB is empty, not taken 444 * LPROPS_FREEABLE: free + dirty == leb_size, not index, not taken 445 * LPROPS_FRDI_IDX: free + dirty == leb_size and index, may be taken 446 * LPROPS_CAT_MASK: mask for the LEB categories above 447 * LPROPS_TAKEN: LEB was taken (this flag is not saved on the media) 448 * LPROPS_INDEX: LEB contains indexing nodes (this flag also exists on flash) 449 */ 450 enum { 451 LPROPS_UNCAT = 0, 452 LPROPS_DIRTY = 1, 453 LPROPS_DIRTY_IDX = 2, 454 LPROPS_FREE = 3, 455 LPROPS_HEAP_CNT = 3, 456 LPROPS_EMPTY = 4, 457 LPROPS_FREEABLE = 5, 458 LPROPS_FRDI_IDX = 6, 459 LPROPS_CAT_MASK = 15, 460 LPROPS_TAKEN = 16, 461 LPROPS_INDEX = 32, 462 }; 463 464 /** 465 * struct ubifs_lprops - logical eraseblock properties. 466 * @free: amount of free space in bytes 467 * @dirty: amount of dirty space in bytes 468 * @flags: LEB properties flags (see above) 469 * @lnum: LEB number 470 * @list: list of same-category lprops (for LPROPS_EMPTY and LPROPS_FREEABLE) 471 * @hpos: heap position in heap of same-category lprops (other categories) 472 */ 473 struct ubifs_lprops { 474 int free; 475 int dirty; 476 int flags; 477 int lnum; 478 union { 479 struct list_head list; 480 int hpos; 481 }; 482 }; 483 484 /** 485 * struct ubifs_lpt_lprops - LPT logical eraseblock properties. 486 * @free: amount of free space in bytes 487 * @dirty: amount of dirty space in bytes 488 * @tgc: trivial GC flag (1 => unmap after commit end) 489 * @cmt: commit flag (1 => reserved for commit) 490 */ 491 struct ubifs_lpt_lprops { 492 int free; 493 int dirty; 494 unsigned tgc:1; 495 unsigned cmt:1; 496 }; 497 498 /** 499 * struct ubifs_lp_stats - statistics of eraseblocks in the main area. 500 * @empty_lebs: number of empty LEBs 501 * @taken_empty_lebs: number of taken LEBs 502 * @idx_lebs: number of indexing LEBs 503 * @total_free: total free space in bytes (includes all LEBs) 504 * @total_dirty: total dirty space in bytes (includes all LEBs) 505 * @total_used: total used space in bytes (does not include index LEBs) 506 * @total_dead: total dead space in bytes (does not include index LEBs) 507 * @total_dark: total dark space in bytes (does not include index LEBs) 508 * 509 * The @taken_empty_lebs field counts the LEBs that are in the transient state 510 * of having been "taken" for use but not yet written to. @taken_empty_lebs is 511 * needed to account correctly for @gc_lnum, otherwise @empty_lebs could be 512 * used by itself (in which case 'unused_lebs' would be a better name). In the 513 * case of @gc_lnum, it is "taken" at mount time or whenever a LEB is retained 514 * by GC, but unlike other empty LEBs that are "taken", it may not be written 515 * straight away (i.e. before the next commit start or unmount), so either 516 * @gc_lnum must be specially accounted for, or the current approach followed 517 * i.e. count it under @taken_empty_lebs. 518 * 519 * @empty_lebs includes @taken_empty_lebs. 520 * 521 * @total_used, @total_dead and @total_dark fields do not account indexing 522 * LEBs. 523 */ 524 struct ubifs_lp_stats { 525 int empty_lebs; 526 int taken_empty_lebs; 527 int idx_lebs; 528 long long total_free; 529 long long total_dirty; 530 long long total_used; 531 long long total_dead; 532 long long total_dark; 533 }; 534 535 struct ubifs_nnode; 536 537 /** 538 * struct ubifs_cnode - LEB Properties Tree common node. 539 * @parent: parent nnode 540 * @cnext: next cnode to commit 541 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE) 542 * @iip: index in parent 543 * @level: level in the tree (zero for pnodes, greater than zero for nnodes) 544 * @num: node number 545 */ 546 struct ubifs_cnode { 547 struct ubifs_nnode *parent; 548 struct ubifs_cnode *cnext; 549 unsigned long flags; 550 int iip; 551 int level; 552 int num; 553 }; 554 555 /** 556 * struct ubifs_pnode - LEB Properties Tree leaf node. 557 * @parent: parent nnode 558 * @cnext: next cnode to commit 559 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE) 560 * @iip: index in parent 561 * @level: level in the tree (always zero for pnodes) 562 * @num: node number 563 * @lprops: LEB properties array 564 */ 565 struct ubifs_pnode { 566 struct ubifs_nnode *parent; 567 struct ubifs_cnode *cnext; 568 unsigned long flags; 569 int iip; 570 int level; 571 int num; 572 struct ubifs_lprops lprops[UBIFS_LPT_FANOUT]; 573 }; 574 575 /** 576 * struct ubifs_nbranch - LEB Properties Tree internal node branch. 577 * @lnum: LEB number of child 578 * @offs: offset of child 579 * @nnode: nnode child 580 * @pnode: pnode child 581 * @cnode: cnode child 582 */ 583 struct ubifs_nbranch { 584 int lnum; 585 int offs; 586 union { 587 struct ubifs_nnode *nnode; 588 struct ubifs_pnode *pnode; 589 struct ubifs_cnode *cnode; 590 }; 591 }; 592 593 /** 594 * struct ubifs_nnode - LEB Properties Tree internal node. 595 * @parent: parent nnode 596 * @cnext: next cnode to commit 597 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE) 598 * @iip: index in parent 599 * @level: level in the tree (always greater than zero for nnodes) 600 * @num: node number 601 * @nbranch: branches to child nodes 602 */ 603 struct ubifs_nnode { 604 struct ubifs_nnode *parent; 605 struct ubifs_cnode *cnext; 606 unsigned long flags; 607 int iip; 608 int level; 609 int num; 610 struct ubifs_nbranch nbranch[UBIFS_LPT_FANOUT]; 611 }; 612 613 /** 614 * struct ubifs_lpt_heap - heap of categorized lprops. 615 * @arr: heap array 616 * @cnt: number in heap 617 * @max_cnt: maximum number allowed in heap 618 * 619 * There are %LPROPS_HEAP_CNT heaps. 620 */ 621 struct ubifs_lpt_heap { 622 struct ubifs_lprops **arr; 623 int cnt; 624 int max_cnt; 625 }; 626 627 /* 628 * Return codes for LPT scan callback function. 629 * 630 * LPT_SCAN_CONTINUE: continue scanning 631 * LPT_SCAN_ADD: add the LEB properties scanned to the tree in memory 632 * LPT_SCAN_STOP: stop scanning 633 */ 634 enum { 635 LPT_SCAN_CONTINUE = 0, 636 LPT_SCAN_ADD = 1, 637 LPT_SCAN_STOP = 2, 638 }; 639 640 struct ubifs_info; 641 642 /* Callback used by the 'ubifs_lpt_scan_nolock()' function */ 643 typedef int (*ubifs_lpt_scan_callback)(struct ubifs_info *c, 644 const struct ubifs_lprops *lprops, 645 int in_tree, void *data); 646 647 /** 648 * struct ubifs_wbuf - UBIFS write-buffer. 649 * @c: UBIFS file-system description object 650 * @buf: write-buffer (of min. flash I/O unit size) 651 * @lnum: logical eraseblock number the write-buffer points to 652 * @offs: write-buffer offset in this logical eraseblock 653 * @avail: number of bytes available in the write-buffer 654 * @used: number of used bytes in the write-buffer 655 * @size: write-buffer size (in [@c->min_io_size, @c->max_write_size] range) 656 * @dtype: type of data stored in this LEB (%UBI_LONGTERM, %UBI_SHORTTERM, 657 * %UBI_UNKNOWN) 658 * @jhead: journal head the mutex belongs to (note, needed only to shut lockdep 659 * up by 'mutex_lock_nested()). 660 * @sync_callback: write-buffer synchronization callback 661 * @io_mutex: serializes write-buffer I/O 662 * @lock: serializes @buf, @lnum, @offs, @avail, @used, @next_ino and @inodes 663 * fields 664 * @softlimit: soft write-buffer timeout interval 665 * @delta: hard and soft timeouts delta (the timer expire inteval is @softlimit 666 * and @softlimit + @delta) 667 * @timer: write-buffer timer 668 * @no_timer: non-zero if this write-buffer does not have a timer 669 * @need_sync: non-zero if the timer expired and the wbuf needs sync'ing 670 * @next_ino: points to the next position of the following inode number 671 * @inodes: stores the inode numbers of the nodes which are in wbuf 672 * 673 * The write-buffer synchronization callback is called when the write-buffer is 674 * synchronized in order to notify how much space was wasted due to 675 * write-buffer padding and how much free space is left in the LEB. 676 * 677 * Note: the fields @buf, @lnum, @offs, @avail and @used can be read under 678 * spin-lock or mutex because they are written under both mutex and spin-lock. 679 * @buf is appended to under mutex but overwritten under both mutex and 680 * spin-lock. Thus the data between @buf and @buf + @used can be read under 681 * spinlock. 682 */ 683 struct ubifs_wbuf { 684 struct ubifs_info *c; 685 void *buf; 686 int lnum; 687 int offs; 688 int avail; 689 int used; 690 int size; 691 int dtype; 692 int jhead; 693 int (*sync_callback)(struct ubifs_info *c, int lnum, int free, int pad); 694 struct mutex io_mutex; 695 spinlock_t lock; 696 ktime_t softlimit; 697 unsigned long long delta; 698 struct hrtimer timer; 699 unsigned int no_timer:1; 700 unsigned int need_sync:1; 701 int next_ino; 702 ino_t *inodes; 703 }; 704 705 /** 706 * struct ubifs_bud - bud logical eraseblock. 707 * @lnum: logical eraseblock number 708 * @start: where the (uncommitted) bud data starts 709 * @jhead: journal head number this bud belongs to 710 * @list: link in the list buds belonging to the same journal head 711 * @rb: link in the tree of all buds 712 */ 713 struct ubifs_bud { 714 int lnum; 715 int start; 716 int jhead; 717 struct list_head list; 718 struct rb_node rb; 719 }; 720 721 /** 722 * struct ubifs_jhead - journal head. 723 * @wbuf: head's write-buffer 724 * @buds_list: list of bud LEBs belonging to this journal head 725 * @grouped: non-zero if UBIFS groups nodes when writing to this journal head 726 * 727 * Note, the @buds list is protected by the @c->buds_lock. 728 */ 729 struct ubifs_jhead { 730 struct ubifs_wbuf wbuf; 731 struct list_head buds_list; 732 unsigned int grouped:1; 733 }; 734 735 /** 736 * struct ubifs_zbranch - key/coordinate/length branch stored in znodes. 737 * @key: key 738 * @znode: znode address in memory 739 * @lnum: LEB number of the target node (indexing node or data node) 740 * @offs: target node offset within @lnum 741 * @len: target node length 742 */ 743 struct ubifs_zbranch { 744 union ubifs_key key; 745 union { 746 struct ubifs_znode *znode; 747 void *leaf; 748 }; 749 int lnum; 750 int offs; 751 int len; 752 }; 753 754 /** 755 * struct ubifs_znode - in-memory representation of an indexing node. 756 * @parent: parent znode or NULL if it is the root 757 * @cnext: next znode to commit 758 * @flags: znode flags (%DIRTY_ZNODE, %COW_ZNODE or %OBSOLETE_ZNODE) 759 * @time: last access time (seconds) 760 * @level: level of the entry in the TNC tree 761 * @child_cnt: count of child znodes 762 * @iip: index in parent's zbranch array 763 * @alt: lower bound of key range has altered i.e. child inserted at slot 0 764 * @lnum: LEB number of the corresponding indexing node 765 * @offs: offset of the corresponding indexing node 766 * @len: length of the corresponding indexing node 767 * @zbranch: array of znode branches (@c->fanout elements) 768 */ 769 struct ubifs_znode { 770 struct ubifs_znode *parent; 771 struct ubifs_znode *cnext; 772 unsigned long flags; 773 unsigned long time; 774 int level; 775 int child_cnt; 776 int iip; 777 int alt; 778 #ifdef CONFIG_UBIFS_FS_DEBUG 779 int lnum, offs, len; 780 #endif 781 struct ubifs_zbranch zbranch[]; 782 }; 783 784 /** 785 * struct bu_info - bulk-read information. 786 * @key: first data node key 787 * @zbranch: zbranches of data nodes to bulk read 788 * @buf: buffer to read into 789 * @buf_len: buffer length 790 * @gc_seq: GC sequence number to detect races with GC 791 * @cnt: number of data nodes for bulk read 792 * @blk_cnt: number of data blocks including holes 793 * @oef: end of file reached 794 */ 795 struct bu_info { 796 union ubifs_key key; 797 struct ubifs_zbranch zbranch[UBIFS_MAX_BULK_READ]; 798 void *buf; 799 int buf_len; 800 int gc_seq; 801 int cnt; 802 int blk_cnt; 803 int eof; 804 }; 805 806 /** 807 * struct ubifs_node_range - node length range description data structure. 808 * @len: fixed node length 809 * @min_len: minimum possible node length 810 * @max_len: maximum possible node length 811 * 812 * If @max_len is %0, the node has fixed length @len. 813 */ 814 struct ubifs_node_range { 815 union { 816 int len; 817 int min_len; 818 }; 819 int max_len; 820 }; 821 822 /** 823 * struct ubifs_compressor - UBIFS compressor description structure. 824 * @compr_type: compressor type (%UBIFS_COMPR_LZO, etc) 825 * @cc: cryptoapi compressor handle 826 * @comp_mutex: mutex used during compression 827 * @decomp_mutex: mutex used during decompression 828 * @name: compressor name 829 * @capi_name: cryptoapi compressor name 830 */ 831 struct ubifs_compressor { 832 int compr_type; 833 struct crypto_comp *cc; 834 struct mutex *comp_mutex; 835 struct mutex *decomp_mutex; 836 const char *name; 837 const char *capi_name; 838 }; 839 840 /** 841 * struct ubifs_budget_req - budget requirements of an operation. 842 * 843 * @fast: non-zero if the budgeting should try to acquire budget quickly and 844 * should not try to call write-back 845 * @recalculate: non-zero if @idx_growth, @data_growth, and @dd_growth fields 846 * have to be re-calculated 847 * @new_page: non-zero if the operation adds a new page 848 * @dirtied_page: non-zero if the operation makes a page dirty 849 * @new_dent: non-zero if the operation adds a new directory entry 850 * @mod_dent: non-zero if the operation removes or modifies an existing 851 * directory entry 852 * @new_ino: non-zero if the operation adds a new inode 853 * @new_ino_d: now much data newly created inode contains 854 * @dirtied_ino: how many inodes the operation makes dirty 855 * @dirtied_ino_d: now much data dirtied inode contains 856 * @idx_growth: how much the index will supposedly grow 857 * @data_growth: how much new data the operation will supposedly add 858 * @dd_growth: how much data that makes other data dirty the operation will 859 * supposedly add 860 * 861 * @idx_growth, @data_growth and @dd_growth are not used in budget request. The 862 * budgeting subsystem caches index and data growth values there to avoid 863 * re-calculating them when the budget is released. However, if @idx_growth is 864 * %-1, it is calculated by the release function using other fields. 865 * 866 * An inode may contain 4KiB of data at max., thus the widths of @new_ino_d 867 * is 13 bits, and @dirtied_ino_d - 15, because up to 4 inodes may be made 868 * dirty by the re-name operation. 869 * 870 * Note, UBIFS aligns node lengths to 8-bytes boundary, so the requester has to 871 * make sure the amount of inode data which contribute to @new_ino_d and 872 * @dirtied_ino_d fields are aligned. 873 */ 874 struct ubifs_budget_req { 875 unsigned int fast:1; 876 unsigned int recalculate:1; 877 #ifndef UBIFS_DEBUG 878 unsigned int new_page:1; 879 unsigned int dirtied_page:1; 880 unsigned int new_dent:1; 881 unsigned int mod_dent:1; 882 unsigned int new_ino:1; 883 unsigned int new_ino_d:13; 884 unsigned int dirtied_ino:4; 885 unsigned int dirtied_ino_d:15; 886 #else 887 /* Not bit-fields to check for overflows */ 888 unsigned int new_page; 889 unsigned int dirtied_page; 890 unsigned int new_dent; 891 unsigned int mod_dent; 892 unsigned int new_ino; 893 unsigned int new_ino_d; 894 unsigned int dirtied_ino; 895 unsigned int dirtied_ino_d; 896 #endif 897 int idx_growth; 898 int data_growth; 899 int dd_growth; 900 }; 901 902 /** 903 * struct ubifs_orphan - stores the inode number of an orphan. 904 * @rb: rb-tree node of rb-tree of orphans sorted by inode number 905 * @list: list head of list of orphans in order added 906 * @new_list: list head of list of orphans added since the last commit 907 * @cnext: next orphan to commit 908 * @dnext: next orphan to delete 909 * @inum: inode number 910 * @new: %1 => added since the last commit, otherwise %0 911 */ 912 struct ubifs_orphan { 913 struct rb_node rb; 914 struct list_head list; 915 struct list_head new_list; 916 struct ubifs_orphan *cnext; 917 struct ubifs_orphan *dnext; 918 ino_t inum; 919 int new; 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 * 1191 * @ltab_lnum: LEB number of LPT's own lprops table 1192 * @ltab_offs: offset of LPT's own lprops table 1193 * @ltab: LPT's own lprops table 1194 * @ltab_cmt: LPT's own lprops table (commit copy) 1195 * @lsave_cnt: number of LEB numbers in LPT's save table 1196 * @lsave_lnum: LEB number of LPT's save table 1197 * @lsave_offs: offset of LPT's save table 1198 * @lsave: LPT's save table 1199 * @lscan_lnum: LEB number of last LPT scan 1200 * 1201 * @rp_size: size of the reserved pool in bytes 1202 * @report_rp_size: size of the reserved pool reported to user-space 1203 * @rp_uid: reserved pool user ID 1204 * @rp_gid: reserved pool group ID 1205 * 1206 * @empty: %1 if the UBI device is empty 1207 * @need_recovery: %1 if the file-system needs recovery 1208 * @replaying: %1 during journal replay 1209 * @mounting: %1 while mounting 1210 * @remounting_rw: %1 while re-mounting from R/O mode to R/W mode 1211 * @replay_list: temporary list used during journal replay 1212 * @replay_buds: list of buds to replay 1213 * @cs_sqnum: sequence number of first node in the log (commit start node) 1214 * @replay_sqnum: sequence number of node currently being replayed 1215 * @unclean_leb_list: LEBs to recover when re-mounting R/O mounted FS to R/W 1216 * mode 1217 * @rcvrd_mst_node: recovered master node to write when re-mounting R/O mounted 1218 * FS to R/W mode 1219 * @size_tree: inode size information for recovery 1220 * @mount_opts: UBIFS-specific mount options 1221 * 1222 * @dbg: debugging-related information 1223 */ 1224 struct ubifs_info { 1225 struct super_block *vfs_sb; 1226 struct backing_dev_info bdi; 1227 1228 ino_t highest_inum; 1229 unsigned long long max_sqnum; 1230 unsigned long long cmt_no; 1231 spinlock_t cnt_lock; 1232 int fmt_version; 1233 int ro_compat_version; 1234 unsigned char uuid[16]; 1235 1236 int lhead_lnum; 1237 int lhead_offs; 1238 int ltail_lnum; 1239 struct mutex log_mutex; 1240 int min_log_bytes; 1241 long long cmt_bud_bytes; 1242 1243 struct rb_root buds; 1244 long long bud_bytes; 1245 spinlock_t buds_lock; 1246 int jhead_cnt; 1247 struct ubifs_jhead *jheads; 1248 long long max_bud_bytes; 1249 long long bg_bud_bytes; 1250 struct list_head old_buds; 1251 int max_bud_cnt; 1252 1253 struct rw_semaphore commit_sem; 1254 int cmt_state; 1255 spinlock_t cs_lock; 1256 wait_queue_head_t cmt_wq; 1257 1258 unsigned int big_lpt:1; 1259 unsigned int space_fixup:1; 1260 unsigned int no_chk_data_crc:1; 1261 unsigned int bulk_read:1; 1262 unsigned int default_compr:2; 1263 unsigned int rw_incompat:1; 1264 1265 struct mutex tnc_mutex; 1266 struct ubifs_zbranch zroot; 1267 struct ubifs_znode *cnext; 1268 struct ubifs_znode *enext; 1269 int *gap_lebs; 1270 void *cbuf; 1271 void *ileb_buf; 1272 int ileb_len; 1273 int ihead_lnum; 1274 int ihead_offs; 1275 int *ilebs; 1276 int ileb_cnt; 1277 int ileb_nxt; 1278 struct rb_root old_idx; 1279 int *bottom_up_buf; 1280 1281 struct ubifs_mst_node *mst_node; 1282 int mst_offs; 1283 struct mutex mst_mutex; 1284 1285 int max_bu_buf_len; 1286 struct mutex bu_mutex; 1287 struct bu_info bu; 1288 1289 struct mutex write_reserve_mutex; 1290 void *write_reserve_buf; 1291 1292 int log_lebs; 1293 long long log_bytes; 1294 int log_last; 1295 int lpt_lebs; 1296 int lpt_first; 1297 int lpt_last; 1298 int orph_lebs; 1299 int orph_first; 1300 int orph_last; 1301 int main_lebs; 1302 int main_first; 1303 long long main_bytes; 1304 1305 uint8_t key_hash_type; 1306 uint32_t (*key_hash)(const char *str, int len); 1307 int key_fmt; 1308 int key_len; 1309 int fanout; 1310 1311 int min_io_size; 1312 int min_io_shift; 1313 int max_write_size; 1314 int max_write_shift; 1315 int leb_size; 1316 int leb_start; 1317 int half_leb_size; 1318 int idx_leb_size; 1319 int leb_cnt; 1320 int max_leb_cnt; 1321 int old_leb_cnt; 1322 unsigned int ro_media:1; 1323 unsigned int ro_mount:1; 1324 unsigned int ro_error:1; 1325 1326 atomic_long_t dirty_pg_cnt; 1327 atomic_long_t dirty_zn_cnt; 1328 atomic_long_t clean_zn_cnt; 1329 1330 spinlock_t space_lock; 1331 struct ubifs_lp_stats lst; 1332 struct ubifs_budg_info bi; 1333 unsigned long long calc_idx_sz; 1334 1335 int ref_node_alsz; 1336 int mst_node_alsz; 1337 int min_idx_node_sz; 1338 int max_idx_node_sz; 1339 long long max_inode_sz; 1340 int max_znode_sz; 1341 1342 int leb_overhead; 1343 int dead_wm; 1344 int dark_wm; 1345 int block_cnt; 1346 1347 struct ubifs_node_range ranges[UBIFS_NODE_TYPES_CNT]; 1348 struct ubi_volume_desc *ubi; 1349 struct ubi_device_info di; 1350 struct ubi_volume_info vi; 1351 1352 struct rb_root orph_tree; 1353 struct list_head orph_list; 1354 struct list_head orph_new; 1355 struct ubifs_orphan *orph_cnext; 1356 struct ubifs_orphan *orph_dnext; 1357 spinlock_t orphan_lock; 1358 void *orph_buf; 1359 int new_orphans; 1360 int cmt_orphans; 1361 int tot_orphans; 1362 int max_orphans; 1363 int ohead_lnum; 1364 int ohead_offs; 1365 int no_orphs; 1366 1367 struct task_struct *bgt; 1368 char bgt_name[sizeof(BGT_NAME_PATTERN) + 9]; 1369 int need_bgt; 1370 int need_wbuf_sync; 1371 1372 int gc_lnum; 1373 void *sbuf; 1374 struct list_head idx_gc; 1375 int idx_gc_cnt; 1376 int gc_seq; 1377 int gced_lnum; 1378 1379 struct list_head infos_list; 1380 struct mutex umount_mutex; 1381 unsigned int shrinker_run_no; 1382 1383 int space_bits; 1384 int lpt_lnum_bits; 1385 int lpt_offs_bits; 1386 int lpt_spc_bits; 1387 int pcnt_bits; 1388 int lnum_bits; 1389 int nnode_sz; 1390 int pnode_sz; 1391 int ltab_sz; 1392 int lsave_sz; 1393 int pnode_cnt; 1394 int nnode_cnt; 1395 int lpt_hght; 1396 int pnodes_have; 1397 1398 struct mutex lp_mutex; 1399 int lpt_lnum; 1400 int lpt_offs; 1401 int nhead_lnum; 1402 int nhead_offs; 1403 int lpt_drty_flgs; 1404 int dirty_nn_cnt; 1405 int dirty_pn_cnt; 1406 int check_lpt_free; 1407 long long lpt_sz; 1408 void *lpt_nod_buf; 1409 void *lpt_buf; 1410 struct ubifs_nnode *nroot; 1411 struct ubifs_cnode *lpt_cnext; 1412 struct ubifs_lpt_heap lpt_heap[LPROPS_HEAP_CNT]; 1413 struct ubifs_lpt_heap dirty_idx; 1414 struct list_head uncat_list; 1415 struct list_head empty_list; 1416 struct list_head freeable_list; 1417 struct list_head frdi_idx_list; 1418 int freeable_cnt; 1419 1420 int ltab_lnum; 1421 int ltab_offs; 1422 struct ubifs_lpt_lprops *ltab; 1423 struct ubifs_lpt_lprops *ltab_cmt; 1424 int lsave_cnt; 1425 int lsave_lnum; 1426 int lsave_offs; 1427 int *lsave; 1428 int lscan_lnum; 1429 1430 long long rp_size; 1431 long long report_rp_size; 1432 uid_t rp_uid; 1433 gid_t rp_gid; 1434 1435 /* The below fields are used only during mounting and re-mounting */ 1436 unsigned int empty:1; 1437 unsigned int need_recovery:1; 1438 unsigned int replaying:1; 1439 unsigned int mounting:1; 1440 unsigned int remounting_rw:1; 1441 struct list_head replay_list; 1442 struct list_head replay_buds; 1443 unsigned long long cs_sqnum; 1444 unsigned long long replay_sqnum; 1445 struct list_head unclean_leb_list; 1446 struct ubifs_mst_node *rcvrd_mst_node; 1447 struct rb_root size_tree; 1448 struct ubifs_mount_opts mount_opts; 1449 1450 #ifdef CONFIG_UBIFS_FS_DEBUG 1451 struct ubifs_debug_info *dbg; 1452 #endif 1453 }; 1454 1455 extern struct list_head ubifs_infos; 1456 extern spinlock_t ubifs_infos_lock; 1457 extern atomic_long_t ubifs_clean_zn_cnt; 1458 extern struct kmem_cache *ubifs_inode_slab; 1459 extern const struct super_operations ubifs_super_operations; 1460 extern const struct address_space_operations ubifs_file_address_operations; 1461 extern const struct file_operations ubifs_file_operations; 1462 extern const struct inode_operations ubifs_file_inode_operations; 1463 extern const struct file_operations ubifs_dir_operations; 1464 extern const struct inode_operations ubifs_dir_inode_operations; 1465 extern const struct inode_operations ubifs_symlink_inode_operations; 1466 extern struct backing_dev_info ubifs_backing_dev_info; 1467 extern struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT]; 1468 1469 /* io.c */ 1470 void ubifs_ro_mode(struct ubifs_info *c, int err); 1471 int ubifs_leb_read(const struct ubifs_info *c, int lnum, void *buf, int offs, 1472 int len, int even_ebadmsg); 1473 int ubifs_leb_write(struct ubifs_info *c, int lnum, const void *buf, int offs, 1474 int len, int dtype); 1475 int ubifs_leb_change(struct ubifs_info *c, int lnum, const void *buf, int len, 1476 int dtype); 1477 int ubifs_leb_unmap(struct ubifs_info *c, int lnum); 1478 int ubifs_leb_map(struct ubifs_info *c, int lnum, int dtype); 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 dtype); 1483 int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf); 1484 int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len, 1485 int lnum, int offs); 1486 int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len, 1487 int lnum, int offs); 1488 int ubifs_write_node(struct ubifs_info *c, void *node, int len, int lnum, 1489 int offs, int dtype); 1490 int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum, 1491 int offs, int quiet, int must_chk_crc); 1492 void ubifs_prepare_node(struct ubifs_info *c, void *buf, int len, int pad); 1493 void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last); 1494 int ubifs_io_init(struct ubifs_info *c); 1495 void ubifs_pad(const struct ubifs_info *c, void *buf, int pad); 1496 int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf); 1497 int ubifs_bg_wbufs_sync(struct ubifs_info *c); 1498 void ubifs_wbuf_add_ino_nolock(struct ubifs_wbuf *wbuf, ino_t inum); 1499 int ubifs_sync_wbufs_by_inode(struct ubifs_info *c, struct inode *inode); 1500 1501 /* scan.c */ 1502 struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum, 1503 int offs, void *sbuf, int quiet); 1504 void ubifs_scan_destroy(struct ubifs_scan_leb *sleb); 1505 int ubifs_scan_a_node(const struct ubifs_info *c, void *buf, int len, int lnum, 1506 int offs, int quiet); 1507 struct ubifs_scan_leb *ubifs_start_scan(const struct ubifs_info *c, int lnum, 1508 int offs, void *sbuf); 1509 void ubifs_end_scan(const struct ubifs_info *c, struct ubifs_scan_leb *sleb, 1510 int lnum, int offs); 1511 int ubifs_add_snod(const struct ubifs_info *c, struct ubifs_scan_leb *sleb, 1512 void *buf, int offs); 1513 void ubifs_scanned_corruption(const struct ubifs_info *c, int lnum, int offs, 1514 void *buf); 1515 1516 /* log.c */ 1517 void ubifs_add_bud(struct ubifs_info *c, struct ubifs_bud *bud); 1518 void ubifs_create_buds_lists(struct ubifs_info *c); 1519 int ubifs_add_bud_to_log(struct ubifs_info *c, int jhead, int lnum, int offs); 1520 struct ubifs_bud *ubifs_search_bud(struct ubifs_info *c, int lnum); 1521 struct ubifs_wbuf *ubifs_get_wbuf(struct ubifs_info *c, int lnum); 1522 int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum); 1523 int ubifs_log_end_commit(struct ubifs_info *c, int new_ltail_lnum); 1524 int ubifs_log_post_commit(struct ubifs_info *c, int old_ltail_lnum); 1525 int ubifs_consolidate_log(struct ubifs_info *c); 1526 1527 /* journal.c */ 1528 int ubifs_jnl_update(struct ubifs_info *c, const struct inode *dir, 1529 const struct qstr *nm, const struct inode *inode, 1530 int deletion, int xent); 1531 int ubifs_jnl_write_data(struct ubifs_info *c, const struct inode *inode, 1532 const union ubifs_key *key, const void *buf, int len); 1533 int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode); 1534 int ubifs_jnl_delete_inode(struct ubifs_info *c, const struct inode *inode); 1535 int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir, 1536 const struct dentry *old_dentry, 1537 const struct inode *new_dir, 1538 const struct dentry *new_dentry, int sync); 1539 int ubifs_jnl_truncate(struct ubifs_info *c, const struct inode *inode, 1540 loff_t old_size, loff_t new_size); 1541 int ubifs_jnl_delete_xattr(struct ubifs_info *c, const struct inode *host, 1542 const struct inode *inode, const struct qstr *nm); 1543 int ubifs_jnl_change_xattr(struct ubifs_info *c, const struct inode *inode1, 1544 const struct inode *inode2); 1545 1546 /* budget.c */ 1547 int ubifs_budget_space(struct ubifs_info *c, struct ubifs_budget_req *req); 1548 void ubifs_release_budget(struct ubifs_info *c, struct ubifs_budget_req *req); 1549 void ubifs_release_dirty_inode_budget(struct ubifs_info *c, 1550 struct ubifs_inode *ui); 1551 int ubifs_budget_inode_op(struct ubifs_info *c, struct inode *inode, 1552 struct ubifs_budget_req *req); 1553 void ubifs_release_ino_dirty(struct ubifs_info *c, struct inode *inode, 1554 struct ubifs_budget_req *req); 1555 void ubifs_cancel_ino_op(struct ubifs_info *c, struct inode *inode, 1556 struct ubifs_budget_req *req); 1557 long long ubifs_get_free_space(struct ubifs_info *c); 1558 long long ubifs_get_free_space_nolock(struct ubifs_info *c); 1559 int ubifs_calc_min_idx_lebs(struct ubifs_info *c); 1560 void ubifs_convert_page_budget(struct ubifs_info *c); 1561 long long ubifs_reported_space(const struct ubifs_info *c, long long free); 1562 long long ubifs_calc_available(const struct ubifs_info *c, int min_idx_lebs); 1563 1564 /* find.c */ 1565 int ubifs_find_free_space(struct ubifs_info *c, int min_space, int *offs, 1566 int squeeze); 1567 int ubifs_find_free_leb_for_idx(struct ubifs_info *c); 1568 int ubifs_find_dirty_leb(struct ubifs_info *c, struct ubifs_lprops *ret_lp, 1569 int min_space, int pick_free); 1570 int ubifs_find_dirty_idx_leb(struct ubifs_info *c); 1571 int ubifs_save_dirty_idx_lnums(struct ubifs_info *c); 1572 1573 /* tnc.c */ 1574 int ubifs_lookup_level0(struct ubifs_info *c, const union ubifs_key *key, 1575 struct ubifs_znode **zn, int *n); 1576 int ubifs_tnc_lookup_nm(struct ubifs_info *c, const union ubifs_key *key, 1577 void *node, const struct qstr *nm); 1578 int ubifs_tnc_locate(struct ubifs_info *c, const union ubifs_key *key, 1579 void *node, int *lnum, int *offs); 1580 int ubifs_tnc_add(struct ubifs_info *c, const union ubifs_key *key, int lnum, 1581 int offs, int len); 1582 int ubifs_tnc_replace(struct ubifs_info *c, const union ubifs_key *key, 1583 int old_lnum, int old_offs, int lnum, int offs, int len); 1584 int ubifs_tnc_add_nm(struct ubifs_info *c, const union ubifs_key *key, 1585 int lnum, int offs, int len, const struct qstr *nm); 1586 int ubifs_tnc_remove(struct ubifs_info *c, const union ubifs_key *key); 1587 int ubifs_tnc_remove_nm(struct ubifs_info *c, const union ubifs_key *key, 1588 const struct qstr *nm); 1589 int ubifs_tnc_remove_range(struct ubifs_info *c, union ubifs_key *from_key, 1590 union ubifs_key *to_key); 1591 int ubifs_tnc_remove_ino(struct ubifs_info *c, ino_t inum); 1592 struct ubifs_dent_node *ubifs_tnc_next_ent(struct ubifs_info *c, 1593 union ubifs_key *key, 1594 const struct qstr *nm); 1595 void ubifs_tnc_close(struct ubifs_info *c); 1596 int ubifs_tnc_has_node(struct ubifs_info *c, union ubifs_key *key, int level, 1597 int lnum, int offs, int is_idx); 1598 int ubifs_dirty_idx_node(struct ubifs_info *c, union ubifs_key *key, int level, 1599 int lnum, int offs); 1600 /* Shared by tnc.c for tnc_commit.c */ 1601 void destroy_old_idx(struct ubifs_info *c); 1602 int is_idx_node_in_tnc(struct ubifs_info *c, union ubifs_key *key, int level, 1603 int lnum, int offs); 1604 int insert_old_idx_znode(struct ubifs_info *c, struct ubifs_znode *znode); 1605 int ubifs_tnc_get_bu_keys(struct ubifs_info *c, struct bu_info *bu); 1606 int ubifs_tnc_bulk_read(struct ubifs_info *c, struct bu_info *bu); 1607 1608 /* tnc_misc.c */ 1609 struct ubifs_znode *ubifs_tnc_levelorder_next(struct ubifs_znode *zr, 1610 struct ubifs_znode *znode); 1611 int ubifs_search_zbranch(const struct ubifs_info *c, 1612 const struct ubifs_znode *znode, 1613 const union ubifs_key *key, int *n); 1614 struct ubifs_znode *ubifs_tnc_postorder_first(struct ubifs_znode *znode); 1615 struct ubifs_znode *ubifs_tnc_postorder_next(struct ubifs_znode *znode); 1616 long ubifs_destroy_tnc_subtree(struct ubifs_znode *zr); 1617 struct ubifs_znode *ubifs_load_znode(struct ubifs_info *c, 1618 struct ubifs_zbranch *zbr, 1619 struct ubifs_znode *parent, int iip); 1620 int ubifs_tnc_read_node(struct ubifs_info *c, struct ubifs_zbranch *zbr, 1621 void *node); 1622 1623 /* tnc_commit.c */ 1624 int ubifs_tnc_start_commit(struct ubifs_info *c, struct ubifs_zbranch *zroot); 1625 int ubifs_tnc_end_commit(struct ubifs_info *c); 1626 1627 /* shrinker.c */ 1628 int ubifs_shrinker(struct shrinker *shrink, struct shrink_control *sc); 1629 1630 /* commit.c */ 1631 int ubifs_bg_thread(void *info); 1632 void ubifs_commit_required(struct ubifs_info *c); 1633 void ubifs_request_bg_commit(struct ubifs_info *c); 1634 int ubifs_run_commit(struct ubifs_info *c); 1635 void ubifs_recovery_commit(struct ubifs_info *c); 1636 int ubifs_gc_should_commit(struct ubifs_info *c); 1637 void ubifs_wait_for_commit(struct ubifs_info *c); 1638 1639 /* master.c */ 1640 int ubifs_read_master(struct ubifs_info *c); 1641 int ubifs_write_master(struct ubifs_info *c); 1642 1643 /* sb.c */ 1644 int ubifs_read_superblock(struct ubifs_info *c); 1645 struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c); 1646 int ubifs_write_sb_node(struct ubifs_info *c, struct ubifs_sb_node *sup); 1647 int ubifs_fixup_free_space(struct ubifs_info *c); 1648 1649 /* replay.c */ 1650 int ubifs_validate_entry(struct ubifs_info *c, 1651 const struct ubifs_dent_node *dent); 1652 int ubifs_replay_journal(struct ubifs_info *c); 1653 1654 /* gc.c */ 1655 int ubifs_garbage_collect(struct ubifs_info *c, int anyway); 1656 int ubifs_gc_start_commit(struct ubifs_info *c); 1657 int ubifs_gc_end_commit(struct ubifs_info *c); 1658 void ubifs_destroy_idx_gc(struct ubifs_info *c); 1659 int ubifs_get_idx_gc_leb(struct ubifs_info *c); 1660 int ubifs_garbage_collect_leb(struct ubifs_info *c, struct ubifs_lprops *lp); 1661 1662 /* orphan.c */ 1663 int ubifs_add_orphan(struct ubifs_info *c, ino_t inum); 1664 void ubifs_delete_orphan(struct ubifs_info *c, ino_t inum); 1665 int ubifs_orphan_start_commit(struct ubifs_info *c); 1666 int ubifs_orphan_end_commit(struct ubifs_info *c); 1667 int ubifs_mount_orphans(struct ubifs_info *c, int unclean, int read_only); 1668 int ubifs_clear_orphans(struct ubifs_info *c); 1669 1670 /* lpt.c */ 1671 int ubifs_calc_lpt_geom(struct ubifs_info *c); 1672 int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first, 1673 int *lpt_lebs, int *big_lpt); 1674 int ubifs_lpt_init(struct ubifs_info *c, int rd, int wr); 1675 struct ubifs_lprops *ubifs_lpt_lookup(struct ubifs_info *c, int lnum); 1676 struct ubifs_lprops *ubifs_lpt_lookup_dirty(struct ubifs_info *c, int lnum); 1677 int ubifs_lpt_scan_nolock(struct ubifs_info *c, int start_lnum, int end_lnum, 1678 ubifs_lpt_scan_callback scan_cb, void *data); 1679 1680 /* Shared by lpt.c for lpt_commit.c */ 1681 void ubifs_pack_lsave(struct ubifs_info *c, void *buf, int *lsave); 1682 void ubifs_pack_ltab(struct ubifs_info *c, void *buf, 1683 struct ubifs_lpt_lprops *ltab); 1684 void ubifs_pack_pnode(struct ubifs_info *c, void *buf, 1685 struct ubifs_pnode *pnode); 1686 void ubifs_pack_nnode(struct ubifs_info *c, void *buf, 1687 struct ubifs_nnode *nnode); 1688 struct ubifs_pnode *ubifs_get_pnode(struct ubifs_info *c, 1689 struct ubifs_nnode *parent, int iip); 1690 struct ubifs_nnode *ubifs_get_nnode(struct ubifs_info *c, 1691 struct ubifs_nnode *parent, int iip); 1692 int ubifs_read_nnode(struct ubifs_info *c, struct ubifs_nnode *parent, int iip); 1693 void ubifs_add_lpt_dirt(struct ubifs_info *c, int lnum, int dirty); 1694 void ubifs_add_nnode_dirt(struct ubifs_info *c, struct ubifs_nnode *nnode); 1695 uint32_t ubifs_unpack_bits(uint8_t **addr, int *pos, int nrbits); 1696 struct ubifs_nnode *ubifs_first_nnode(struct ubifs_info *c, int *hght); 1697 /* Needed only in debugging code in lpt_commit.c */ 1698 int ubifs_unpack_nnode(const struct ubifs_info *c, void *buf, 1699 struct ubifs_nnode *nnode); 1700 1701 /* lpt_commit.c */ 1702 int ubifs_lpt_start_commit(struct ubifs_info *c); 1703 int ubifs_lpt_end_commit(struct ubifs_info *c); 1704 int ubifs_lpt_post_commit(struct ubifs_info *c); 1705 void ubifs_lpt_free(struct ubifs_info *c, int wr_only); 1706 1707 /* lprops.c */ 1708 const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c, 1709 const struct ubifs_lprops *lp, 1710 int free, int dirty, int flags, 1711 int idx_gc_cnt); 1712 void ubifs_get_lp_stats(struct ubifs_info *c, struct ubifs_lp_stats *lst); 1713 void ubifs_add_to_cat(struct ubifs_info *c, struct ubifs_lprops *lprops, 1714 int cat); 1715 void ubifs_replace_cat(struct ubifs_info *c, struct ubifs_lprops *old_lprops, 1716 struct ubifs_lprops *new_lprops); 1717 void ubifs_ensure_cat(struct ubifs_info *c, struct ubifs_lprops *lprops); 1718 int ubifs_categorize_lprops(const struct ubifs_info *c, 1719 const struct ubifs_lprops *lprops); 1720 int ubifs_change_one_lp(struct ubifs_info *c, int lnum, int free, int dirty, 1721 int flags_set, int flags_clean, int idx_gc_cnt); 1722 int ubifs_update_one_lp(struct ubifs_info *c, int lnum, int free, int dirty, 1723 int flags_set, int flags_clean); 1724 int ubifs_read_one_lp(struct ubifs_info *c, int lnum, struct ubifs_lprops *lp); 1725 const struct ubifs_lprops *ubifs_fast_find_free(struct ubifs_info *c); 1726 const struct ubifs_lprops *ubifs_fast_find_empty(struct ubifs_info *c); 1727 const struct ubifs_lprops *ubifs_fast_find_freeable(struct ubifs_info *c); 1728 const struct ubifs_lprops *ubifs_fast_find_frdi_idx(struct ubifs_info *c); 1729 int ubifs_calc_dark(const struct ubifs_info *c, int spc); 1730 1731 /* file.c */ 1732 int ubifs_fsync(struct file *file, loff_t start, loff_t end, int datasync); 1733 int ubifs_setattr(struct dentry *dentry, struct iattr *attr); 1734 1735 /* dir.c */ 1736 struct inode *ubifs_new_inode(struct ubifs_info *c, const struct inode *dir, 1737 int mode); 1738 int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1739 struct kstat *stat); 1740 1741 /* xattr.c */ 1742 int ubifs_setxattr(struct dentry *dentry, const char *name, 1743 const void *value, size_t size, int flags); 1744 ssize_t ubifs_getxattr(struct dentry *dentry, const char *name, void *buf, 1745 size_t size); 1746 ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size); 1747 int ubifs_removexattr(struct dentry *dentry, const char *name); 1748 1749 /* super.c */ 1750 struct inode *ubifs_iget(struct super_block *sb, unsigned long inum); 1751 1752 /* recovery.c */ 1753 int ubifs_recover_master_node(struct ubifs_info *c); 1754 int ubifs_write_rcvrd_mst_node(struct ubifs_info *c); 1755 struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum, 1756 int offs, void *sbuf, int jhead); 1757 struct ubifs_scan_leb *ubifs_recover_log_leb(struct ubifs_info *c, int lnum, 1758 int offs, void *sbuf); 1759 int ubifs_recover_inl_heads(struct ubifs_info *c, void *sbuf); 1760 int ubifs_clean_lebs(struct ubifs_info *c, void *sbuf); 1761 int ubifs_rcvry_gc_commit(struct ubifs_info *c); 1762 int ubifs_recover_size_accum(struct ubifs_info *c, union ubifs_key *key, 1763 int deletion, loff_t new_size); 1764 int ubifs_recover_size(struct ubifs_info *c); 1765 void ubifs_destroy_size_tree(struct ubifs_info *c); 1766 1767 /* ioctl.c */ 1768 long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 1769 void ubifs_set_inode_flags(struct inode *inode); 1770 #ifdef CONFIG_COMPAT 1771 long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 1772 #endif 1773 1774 /* compressor.c */ 1775 int __init ubifs_compressors_init(void); 1776 void ubifs_compressors_exit(void); 1777 void ubifs_compress(const void *in_buf, int in_len, void *out_buf, int *out_len, 1778 int *compr_type); 1779 int ubifs_decompress(const void *buf, int len, void *out, int *out_len, 1780 int compr_type); 1781 1782 #include "debug.h" 1783 #include "misc.h" 1784 #include "key.h" 1785 1786 #endif /* !__UBIFS_H__ */ 1787