1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * This file is part of UBIFS. 4 * 5 * Copyright (C) 2006-2008 Nokia Corporation 6 * 7 * Authors: Artem Bityutskiy (Битюцкий Артём) 8 * Adrian Hunter 9 */ 10 11 #ifndef __UBIFS_H__ 12 #define __UBIFS_H__ 13 14 #include <asm/div64.h> 15 #include <linux/statfs.h> 16 #include <linux/fs.h> 17 #include <linux/err.h> 18 #include <linux/sched.h> 19 #include <linux/slab.h> 20 #include <linux/vmalloc.h> 21 #include <linux/spinlock.h> 22 #include <linux/mutex.h> 23 #include <linux/rwsem.h> 24 #include <linux/mtd/ubi.h> 25 #include <linux/pagemap.h> 26 #include <linux/backing-dev.h> 27 #include <linux/security.h> 28 #include <linux/xattr.h> 29 #include <linux/random.h> 30 #include <linux/sysfs.h> 31 #include <linux/completion.h> 32 #include <crypto/hash_info.h> 33 #include <crypto/hash.h> 34 #include <crypto/algapi.h> 35 36 #include <linux/fscrypt.h> 37 38 #include "ubifs-media.h" 39 40 /* Version of this UBIFS implementation */ 41 #define UBIFS_VERSION 1 42 43 /* UBIFS file system VFS magic number */ 44 #define UBIFS_SUPER_MAGIC 0x24051905 45 46 /* Number of UBIFS blocks per VFS page */ 47 #define UBIFS_BLOCKS_PER_PAGE (PAGE_SIZE / UBIFS_BLOCK_SIZE) 48 #define UBIFS_BLOCKS_PER_PAGE_SHIFT (PAGE_SHIFT - UBIFS_BLOCK_SHIFT) 49 50 /* "File system end of life" sequence number watermark */ 51 #define SQNUM_WARN_WATERMARK 0xFFFFFFFF00000000ULL 52 #define SQNUM_WATERMARK 0xFFFFFFFFFF000000ULL 53 54 /* 55 * Minimum amount of LEBs reserved for the index. At present the index needs at 56 * least 2 LEBs: one for the index head and one for in-the-gaps method (which 57 * currently does not cater for the index head and so excludes it from 58 * consideration). 59 */ 60 #define MIN_INDEX_LEBS 2 61 62 /* Minimum amount of data UBIFS writes to the flash */ 63 #define MIN_WRITE_SZ (UBIFS_DATA_NODE_SZ + 8) 64 65 /* 66 * Currently we do not support inode number overlapping and re-using, so this 67 * watermark defines dangerous inode number level. This should be fixed later, 68 * although it is difficult to exceed current limit. Another option is to use 69 * 64-bit inode numbers, but this means more overhead. 70 */ 71 #define INUM_WARN_WATERMARK 0xFFF00000 72 #define INUM_WATERMARK 0xFFFFFF00 73 74 /* Maximum number of entries in each LPT (LEB category) heap */ 75 #define LPT_HEAP_SZ 256 76 77 /* 78 * Background thread name pattern. The numbers are UBI device and volume 79 * numbers. 80 */ 81 #define BGT_NAME_PATTERN "ubifs_bgt%d_%d" 82 83 /* Maximum possible inode number (only 32-bit inodes are supported now) */ 84 #define MAX_INUM 0xFFFFFFFF 85 86 /* Number of non-data journal heads */ 87 #define NONDATA_JHEADS_CNT 2 88 89 /* Shorter names for journal head numbers for internal usage */ 90 #define GCHD UBIFS_GC_HEAD 91 #define BASEHD UBIFS_BASE_HEAD 92 #define DATAHD UBIFS_DATA_HEAD 93 94 /* 'No change' value for 'ubifs_change_lp()' */ 95 #define LPROPS_NC 0x80000001 96 97 /* 98 * There is no notion of truncation key because truncation nodes do not exist 99 * in TNC. However, when replaying, it is handy to introduce fake "truncation" 100 * keys for truncation nodes because the code becomes simpler. So we define 101 * %UBIFS_TRUN_KEY type. 102 * 103 * But otherwise, out of the journal reply scope, the truncation keys are 104 * invalid. 105 */ 106 #define UBIFS_TRUN_KEY UBIFS_KEY_TYPES_CNT 107 #define UBIFS_INVALID_KEY UBIFS_KEY_TYPES_CNT 108 109 /* 110 * How much a directory entry/extended attribute entry adds to the parent/host 111 * inode. 112 */ 113 #define CALC_DENT_SIZE(name_len) ALIGN(UBIFS_DENT_NODE_SZ + (name_len) + 1, 8) 114 115 /* How much an extended attribute adds to the host inode */ 116 #define CALC_XATTR_BYTES(data_len) ALIGN(UBIFS_INO_NODE_SZ + (data_len) + 1, 8) 117 118 /* 119 * Znodes which were not touched for 'OLD_ZNODE_AGE' seconds are considered 120 * "old", and znode which were touched last 'YOUNG_ZNODE_AGE' seconds ago are 121 * considered "young". This is used by shrinker when selecting znode to trim 122 * off. 123 */ 124 #define OLD_ZNODE_AGE 20 125 #define YOUNG_ZNODE_AGE 5 126 127 /* 128 * Some compressors, like LZO, may end up with more data then the input buffer. 129 * So UBIFS always allocates larger output buffer, to be sure the compressor 130 * will not corrupt memory in case of worst case compression. 131 */ 132 #define WORST_COMPR_FACTOR 2 133 134 #ifdef CONFIG_FS_ENCRYPTION 135 #define UBIFS_CIPHER_BLOCK_SIZE FSCRYPT_CONTENTS_ALIGNMENT 136 #else 137 #define UBIFS_CIPHER_BLOCK_SIZE 0 138 #endif 139 140 /* 141 * How much memory is needed for a buffer where we compress a data node. 142 */ 143 #define COMPRESSED_DATA_NODE_BUF_SZ \ 144 (UBIFS_DATA_NODE_SZ + UBIFS_BLOCK_SIZE * WORST_COMPR_FACTOR) 145 146 /* Maximum expected tree height for use by bottom_up_buf */ 147 #define BOTTOM_UP_HEIGHT 64 148 149 /* Maximum number of data nodes to bulk-read */ 150 #define UBIFS_MAX_BULK_READ 32 151 152 #ifdef CONFIG_UBIFS_FS_AUTHENTICATION 153 #define UBIFS_HASH_ARR_SZ UBIFS_MAX_HASH_LEN 154 #define UBIFS_HMAC_ARR_SZ UBIFS_MAX_HMAC_LEN 155 #else 156 #define UBIFS_HASH_ARR_SZ 0 157 #define UBIFS_HMAC_ARR_SZ 0 158 #endif 159 160 /* 161 * The UBIFS sysfs directory name pattern and maximum name length (3 for "ubi" 162 * + 1 for "_" and plus 2x2 for 2 UBI numbers and 1 for the trailing zero byte. 163 */ 164 #define UBIFS_DFS_DIR_NAME "ubi%d_%d" 165 #define UBIFS_DFS_DIR_LEN (3 + 1 + 2*2 + 1) 166 167 /* 168 * Lockdep classes for UBIFS inode @ui_mutex. 169 */ 170 enum { 171 WB_MUTEX_1 = 0, 172 WB_MUTEX_2 = 1, 173 WB_MUTEX_3 = 2, 174 WB_MUTEX_4 = 3, 175 }; 176 177 /* 178 * Znode flags (actually, bit numbers which store the flags). 179 * 180 * DIRTY_ZNODE: znode is dirty 181 * COW_ZNODE: znode is being committed and a new instance of this znode has to 182 * be created before changing this znode 183 * OBSOLETE_ZNODE: znode is obsolete, which means it was deleted, but it is 184 * still in the commit list and the ongoing commit operation 185 * will commit it, and delete this znode after it is done 186 */ 187 enum { 188 DIRTY_ZNODE = 0, 189 COW_ZNODE = 1, 190 OBSOLETE_ZNODE = 2, 191 }; 192 193 /* 194 * Commit states. 195 * 196 * COMMIT_RESTING: commit is not wanted 197 * COMMIT_BACKGROUND: background commit has been requested 198 * COMMIT_REQUIRED: commit is required 199 * COMMIT_RUNNING_BACKGROUND: background commit is running 200 * COMMIT_RUNNING_REQUIRED: commit is running and it is required 201 * COMMIT_BROKEN: commit failed 202 */ 203 enum { 204 COMMIT_RESTING = 0, 205 COMMIT_BACKGROUND, 206 COMMIT_REQUIRED, 207 COMMIT_RUNNING_BACKGROUND, 208 COMMIT_RUNNING_REQUIRED, 209 COMMIT_BROKEN, 210 }; 211 212 /* 213 * 'ubifs_scan_a_node()' return values. 214 * 215 * SCANNED_GARBAGE: scanned garbage 216 * SCANNED_EMPTY_SPACE: scanned empty space 217 * SCANNED_A_NODE: scanned a valid node 218 * SCANNED_A_CORRUPT_NODE: scanned a corrupted node 219 * SCANNED_A_BAD_PAD_NODE: scanned a padding node with invalid pad length 220 * 221 * Greater than zero means: 'scanned that number of padding bytes' 222 */ 223 enum { 224 SCANNED_GARBAGE = 0, 225 SCANNED_EMPTY_SPACE = -1, 226 SCANNED_A_NODE = -2, 227 SCANNED_A_CORRUPT_NODE = -3, 228 SCANNED_A_BAD_PAD_NODE = -4, 229 }; 230 231 /* 232 * LPT cnode flag bits. 233 * 234 * DIRTY_CNODE: cnode is dirty 235 * OBSOLETE_CNODE: cnode is being committed and has been copied (or deleted), 236 * so it can (and must) be freed when the commit is finished 237 * COW_CNODE: cnode is being committed and must be copied before writing 238 */ 239 enum { 240 DIRTY_CNODE = 0, 241 OBSOLETE_CNODE = 1, 242 COW_CNODE = 2, 243 }; 244 245 /* 246 * Dirty flag bits (lpt_drty_flgs) for LPT special nodes. 247 * 248 * LTAB_DIRTY: ltab node is dirty 249 * LSAVE_DIRTY: lsave node is dirty 250 */ 251 enum { 252 LTAB_DIRTY = 1, 253 LSAVE_DIRTY = 2, 254 }; 255 256 /* 257 * Return codes used by the garbage collector. 258 * @LEB_FREED: the logical eraseblock was freed and is ready to use 259 * @LEB_FREED_IDX: indexing LEB was freed and can be used only after the commit 260 * @LEB_RETAINED: the logical eraseblock was freed and retained for GC purposes 261 */ 262 enum { 263 LEB_FREED, 264 LEB_FREED_IDX, 265 LEB_RETAINED, 266 }; 267 268 /* 269 * Action taken upon a failed ubifs_assert(). 270 * @ASSACT_REPORT: just report the failed assertion 271 * @ASSACT_RO: switch to read-only mode 272 * @ASSACT_PANIC: call BUG() and possible panic the kernel 273 */ 274 enum { 275 ASSACT_REPORT = 0, 276 ASSACT_RO, 277 ASSACT_PANIC, 278 }; 279 280 /** 281 * struct ubifs_old_idx - index node obsoleted since last commit start. 282 * @rb: rb-tree node 283 * @lnum: LEB number of obsoleted index node 284 * @offs: offset of obsoleted index node 285 */ 286 struct ubifs_old_idx { 287 struct rb_node rb; 288 int lnum; 289 int offs; 290 }; 291 292 /* The below union makes it easier to deal with keys */ 293 union ubifs_key { 294 uint8_t u8[UBIFS_SK_LEN]; 295 uint32_t u32[UBIFS_SK_LEN/4]; 296 uint64_t u64[UBIFS_SK_LEN/8]; 297 __le32 j32[UBIFS_SK_LEN/4]; 298 }; 299 300 /** 301 * struct ubifs_scan_node - UBIFS scanned node information. 302 * @list: list of scanned nodes 303 * @key: key of node scanned (if it has one) 304 * @sqnum: sequence number 305 * @type: type of node scanned 306 * @offs: offset with LEB of node scanned 307 * @len: length of node scanned 308 * @node: raw node 309 */ 310 struct ubifs_scan_node { 311 struct list_head list; 312 union ubifs_key key; 313 unsigned long long sqnum; 314 int type; 315 int offs; 316 int len; 317 void *node; 318 }; 319 320 /** 321 * struct ubifs_scan_leb - UBIFS scanned LEB information. 322 * @lnum: logical eraseblock number 323 * @nodes_cnt: number of nodes scanned 324 * @nodes: list of struct ubifs_scan_node 325 * @endpt: end point (and therefore the start of empty space) 326 * @buf: buffer containing entire LEB scanned 327 */ 328 struct ubifs_scan_leb { 329 int lnum; 330 int nodes_cnt; 331 struct list_head nodes; 332 int endpt; 333 void *buf; 334 }; 335 336 /** 337 * struct ubifs_gced_idx_leb - garbage-collected indexing LEB. 338 * @list: list 339 * @lnum: LEB number 340 * @unmap: OK to unmap this LEB 341 * 342 * This data structure is used to temporary store garbage-collected indexing 343 * LEBs - they are not released immediately, but only after the next commit. 344 * This is needed to guarantee recoverability. 345 */ 346 struct ubifs_gced_idx_leb { 347 struct list_head list; 348 int lnum; 349 int unmap; 350 }; 351 352 /** 353 * struct ubifs_inode - UBIFS in-memory inode description. 354 * @vfs_inode: VFS inode description object 355 * @creat_sqnum: sequence number at time of creation 356 * @del_cmtno: commit number corresponding to the time the inode was deleted, 357 * protected by @c->commit_sem; 358 * @xattr_size: summarized size of all extended attributes in bytes 359 * @xattr_cnt: count of extended attributes this inode has 360 * @xattr_names: sum of lengths of all extended attribute names belonging to 361 * this inode 362 * @dirty: non-zero if the inode is dirty 363 * @xattr: non-zero if this is an extended attribute inode 364 * @bulk_read: non-zero if bulk-read should be used 365 * @ui_mutex: serializes inode write-back with the rest of VFS operations, 366 * serializes "clean <-> dirty" state changes, serializes bulk-read, 367 * protects @dirty, @bulk_read, @ui_size, and @xattr_size 368 * @xattr_sem: serilizes write operations (remove|set|create) on xattr 369 * @ui_lock: protects @synced_i_size 370 * @synced_i_size: synchronized size of inode, i.e. the value of inode size 371 * currently stored on the flash; used only for regular file 372 * inodes 373 * @ui_size: inode size used by UBIFS when writing to flash 374 * @flags: inode flags (@UBIFS_COMPR_FL, etc) 375 * @compr_type: default compression type used for this inode 376 * @last_page_read: page number of last page read (for bulk read) 377 * @read_in_a_row: number of consecutive pages read in a row (for bulk read) 378 * @data_len: length of the data attached to the inode 379 * @data: inode's data 380 * 381 * @ui_mutex exists for two main reasons. At first it prevents inodes from 382 * being written back while UBIFS changing them, being in the middle of an VFS 383 * operation. This way UBIFS makes sure the inode fields are consistent. For 384 * example, in 'ubifs_rename()' we change 4 inodes simultaneously, and 385 * write-back must not write any of them before we have finished. 386 * 387 * The second reason is budgeting - UBIFS has to budget all operations. If an 388 * operation is going to mark an inode dirty, it has to allocate budget for 389 * this. It cannot just mark it dirty because there is no guarantee there will 390 * be enough flash space to write the inode back later. This means UBIFS has 391 * to have full control over inode "clean <-> dirty" transitions (and pages 392 * actually). But unfortunately, VFS marks inodes dirty in many places, and it 393 * does not ask the file-system if it is allowed to do so (there is a notifier, 394 * but it is not enough), i.e., there is no mechanism to synchronize with this. 395 * So UBIFS has its own inode dirty flag and its own mutex to serialize 396 * "clean <-> dirty" transitions. 397 * 398 * The @synced_i_size field is used to make sure we never write pages which are 399 * beyond last synchronized inode size. See 'ubifs_writepage()' for more 400 * information. 401 * 402 * The @ui_size is a "shadow" variable for @inode->i_size and UBIFS uses 403 * @ui_size instead of @inode->i_size. The reason for this is that UBIFS cannot 404 * make sure @inode->i_size is always changed under @ui_mutex, because it 405 * cannot call 'truncate_setsize()' with @ui_mutex locked, because it would 406 * deadlock with 'ubifs_writepage()' (see file.c). All the other inode fields 407 * are changed under @ui_mutex, so they do not need "shadow" fields. Note, one 408 * could consider to rework locking and base it on "shadow" fields. 409 */ 410 struct ubifs_inode { 411 struct inode vfs_inode; 412 unsigned long long creat_sqnum; 413 unsigned long long del_cmtno; 414 unsigned int xattr_size; 415 unsigned int xattr_cnt; 416 unsigned int xattr_names; 417 unsigned int dirty:1; 418 unsigned int xattr:1; 419 unsigned int bulk_read:1; 420 unsigned int compr_type:2; 421 struct mutex ui_mutex; 422 struct rw_semaphore xattr_sem; 423 spinlock_t ui_lock; 424 loff_t synced_i_size; 425 loff_t ui_size; 426 int flags; 427 pgoff_t last_page_read; 428 pgoff_t read_in_a_row; 429 int data_len; 430 void *data; 431 }; 432 433 /** 434 * struct ubifs_unclean_leb - records a LEB recovered under read-only mode. 435 * @list: list 436 * @lnum: LEB number of recovered LEB 437 * @endpt: offset where recovery ended 438 * 439 * This structure records a LEB identified during recovery that needs to be 440 * cleaned but was not because UBIFS was mounted read-only. The information 441 * is used to clean the LEB when remounting to read-write mode. 442 */ 443 struct ubifs_unclean_leb { 444 struct list_head list; 445 int lnum; 446 int endpt; 447 }; 448 449 /* 450 * LEB properties flags. 451 * 452 * LPROPS_UNCAT: not categorized 453 * LPROPS_DIRTY: dirty > free, dirty >= @c->dead_wm, not index 454 * LPROPS_DIRTY_IDX: dirty + free > @c->min_idx_node_sze and index 455 * LPROPS_FREE: free > 0, dirty < @c->dead_wm, not empty, not index 456 * LPROPS_HEAP_CNT: number of heaps used for storing categorized LEBs 457 * LPROPS_EMPTY: LEB is empty, not taken 458 * LPROPS_FREEABLE: free + dirty == leb_size, not index, not taken 459 * LPROPS_FRDI_IDX: free + dirty == leb_size and index, may be taken 460 * LPROPS_CAT_MASK: mask for the LEB categories above 461 * LPROPS_TAKEN: LEB was taken (this flag is not saved on the media) 462 * LPROPS_INDEX: LEB contains indexing nodes (this flag also exists on flash) 463 */ 464 enum { 465 LPROPS_UNCAT = 0, 466 LPROPS_DIRTY = 1, 467 LPROPS_DIRTY_IDX = 2, 468 LPROPS_FREE = 3, 469 LPROPS_HEAP_CNT = 3, 470 LPROPS_EMPTY = 4, 471 LPROPS_FREEABLE = 5, 472 LPROPS_FRDI_IDX = 6, 473 LPROPS_CAT_MASK = 15, 474 LPROPS_TAKEN = 16, 475 LPROPS_INDEX = 32, 476 }; 477 478 /** 479 * struct ubifs_lprops - logical eraseblock properties. 480 * @free: amount of free space in bytes 481 * @dirty: amount of dirty space in bytes 482 * @flags: LEB properties flags (see above) 483 * @lnum: LEB number 484 * @list: list of same-category lprops (for LPROPS_EMPTY and LPROPS_FREEABLE) 485 * @hpos: heap position in heap of same-category lprops (other categories) 486 */ 487 struct ubifs_lprops { 488 int free; 489 int dirty; 490 int flags; 491 int lnum; 492 union { 493 struct list_head list; 494 int hpos; 495 }; 496 }; 497 498 /** 499 * struct ubifs_lpt_lprops - LPT logical eraseblock properties. 500 * @free: amount of free space in bytes 501 * @dirty: amount of dirty space in bytes 502 * @tgc: trivial GC flag (1 => unmap after commit end) 503 * @cmt: commit flag (1 => reserved for commit) 504 */ 505 struct ubifs_lpt_lprops { 506 int free; 507 int dirty; 508 unsigned tgc:1; 509 unsigned cmt:1; 510 }; 511 512 /** 513 * struct ubifs_lp_stats - statistics of eraseblocks in the main area. 514 * @empty_lebs: number of empty LEBs 515 * @taken_empty_lebs: number of taken LEBs 516 * @idx_lebs: number of indexing LEBs 517 * @total_free: total free space in bytes (includes all LEBs) 518 * @total_dirty: total dirty space in bytes (includes all LEBs) 519 * @total_used: total used space in bytes (does not include index LEBs) 520 * @total_dead: total dead space in bytes (does not include index LEBs) 521 * @total_dark: total dark space in bytes (does not include index LEBs) 522 * 523 * The @taken_empty_lebs field counts the LEBs that are in the transient state 524 * of having been "taken" for use but not yet written to. @taken_empty_lebs is 525 * needed to account correctly for @gc_lnum, otherwise @empty_lebs could be 526 * used by itself (in which case 'unused_lebs' would be a better name). In the 527 * case of @gc_lnum, it is "taken" at mount time or whenever a LEB is retained 528 * by GC, but unlike other empty LEBs that are "taken", it may not be written 529 * straight away (i.e. before the next commit start or unmount), so either 530 * @gc_lnum must be specially accounted for, or the current approach followed 531 * i.e. count it under @taken_empty_lebs. 532 * 533 * @empty_lebs includes @taken_empty_lebs. 534 * 535 * @total_used, @total_dead and @total_dark fields do not account indexing 536 * LEBs. 537 */ 538 struct ubifs_lp_stats { 539 int empty_lebs; 540 int taken_empty_lebs; 541 int idx_lebs; 542 long long total_free; 543 long long total_dirty; 544 long long total_used; 545 long long total_dead; 546 long long total_dark; 547 }; 548 549 struct ubifs_nnode; 550 551 /** 552 * struct ubifs_cnode - LEB Properties Tree common 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 (zero for pnodes, greater than zero for nnodes) 558 * @num: node number 559 */ 560 struct ubifs_cnode { 561 struct ubifs_nnode *parent; 562 struct ubifs_cnode *cnext; 563 unsigned long flags; 564 int iip; 565 int level; 566 int num; 567 }; 568 569 /** 570 * struct ubifs_pnode - LEB Properties Tree leaf node. 571 * @parent: parent nnode 572 * @cnext: next cnode to commit 573 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE) 574 * @iip: index in parent 575 * @level: level in the tree (always zero for pnodes) 576 * @num: node number 577 * @lprops: LEB properties array 578 */ 579 struct ubifs_pnode { 580 struct ubifs_nnode *parent; 581 struct ubifs_cnode *cnext; 582 unsigned long flags; 583 int iip; 584 int level; 585 int num; 586 struct ubifs_lprops lprops[UBIFS_LPT_FANOUT]; 587 }; 588 589 /** 590 * struct ubifs_nbranch - LEB Properties Tree internal node branch. 591 * @lnum: LEB number of child 592 * @offs: offset of child 593 * @nnode: nnode child 594 * @pnode: pnode child 595 * @cnode: cnode child 596 */ 597 struct ubifs_nbranch { 598 int lnum; 599 int offs; 600 union { 601 struct ubifs_nnode *nnode; 602 struct ubifs_pnode *pnode; 603 struct ubifs_cnode *cnode; 604 }; 605 }; 606 607 /** 608 * struct ubifs_nnode - LEB Properties Tree internal node. 609 * @parent: parent nnode 610 * @cnext: next cnode to commit 611 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE) 612 * @iip: index in parent 613 * @level: level in the tree (always greater than zero for nnodes) 614 * @num: node number 615 * @nbranch: branches to child nodes 616 */ 617 struct ubifs_nnode { 618 struct ubifs_nnode *parent; 619 struct ubifs_cnode *cnext; 620 unsigned long flags; 621 int iip; 622 int level; 623 int num; 624 struct ubifs_nbranch nbranch[UBIFS_LPT_FANOUT]; 625 }; 626 627 /** 628 * struct ubifs_lpt_heap - heap of categorized lprops. 629 * @arr: heap array 630 * @cnt: number in heap 631 * @max_cnt: maximum number allowed in heap 632 * 633 * There are %LPROPS_HEAP_CNT heaps. 634 */ 635 struct ubifs_lpt_heap { 636 struct ubifs_lprops **arr; 637 int cnt; 638 int max_cnt; 639 }; 640 641 /* 642 * Return codes for LPT scan callback function. 643 * 644 * LPT_SCAN_CONTINUE: continue scanning 645 * LPT_SCAN_ADD: add the LEB properties scanned to the tree in memory 646 * LPT_SCAN_STOP: stop scanning 647 */ 648 enum { 649 LPT_SCAN_CONTINUE = 0, 650 LPT_SCAN_ADD = 1, 651 LPT_SCAN_STOP = 2, 652 }; 653 654 struct ubifs_info; 655 656 /* Callback used by the 'ubifs_lpt_scan_nolock()' function */ 657 typedef int (*ubifs_lpt_scan_callback)(struct ubifs_info *c, 658 const struct ubifs_lprops *lprops, 659 int in_tree, void *data); 660 661 /** 662 * struct ubifs_wbuf - UBIFS write-buffer. 663 * @c: UBIFS file-system description object 664 * @buf: write-buffer (of min. flash I/O unit size) 665 * @lnum: logical eraseblock number the write-buffer points to 666 * @offs: write-buffer offset in this logical eraseblock 667 * @avail: number of bytes available in the write-buffer 668 * @used: number of used bytes in the write-buffer 669 * @size: write-buffer size (in [@c->min_io_size, @c->max_write_size] range) 670 * @jhead: journal head the mutex belongs to (note, needed only to shut lockdep 671 * up by 'mutex_lock_nested()). 672 * @sync_callback: write-buffer synchronization callback 673 * @io_mutex: serializes write-buffer I/O 674 * @lock: serializes @buf, @lnum, @offs, @avail, @used, @next_ino and @inodes 675 * fields 676 * @timer: write-buffer timer 677 * @no_timer: non-zero if this write-buffer does not have a timer 678 * @need_sync: non-zero if the timer expired and the wbuf needs sync'ing 679 * @next_ino: points to the next position of the following inode number 680 * @inodes: stores the inode numbers of the nodes which are in wbuf 681 * 682 * The write-buffer synchronization callback is called when the write-buffer is 683 * synchronized in order to notify how much space was wasted due to 684 * write-buffer padding and how much free space is left in the LEB. 685 * 686 * Note: the fields @buf, @lnum, @offs, @avail and @used can be read under 687 * spin-lock or mutex because they are written under both mutex and spin-lock. 688 * @buf is appended to under mutex but overwritten under both mutex and 689 * spin-lock. Thus the data between @buf and @buf + @used can be read under 690 * spinlock. 691 */ 692 struct ubifs_wbuf { 693 struct ubifs_info *c; 694 void *buf; 695 int lnum; 696 int offs; 697 int avail; 698 int used; 699 int size; 700 int jhead; 701 int (*sync_callback)(struct ubifs_info *c, int lnum, int free, int pad); 702 struct mutex io_mutex; 703 spinlock_t lock; 704 struct hrtimer timer; 705 unsigned int no_timer:1; 706 unsigned int need_sync:1; 707 int next_ino; 708 ino_t *inodes; 709 }; 710 711 /** 712 * struct ubifs_bud - bud logical eraseblock. 713 * @lnum: logical eraseblock number 714 * @start: where the (uncommitted) bud data starts 715 * @jhead: journal head number this bud belongs to 716 * @list: link in the list buds belonging to the same journal head 717 * @rb: link in the tree of all buds 718 * @log_hash: the log hash from the commit start node up to this bud 719 */ 720 struct ubifs_bud { 721 int lnum; 722 int start; 723 int jhead; 724 struct list_head list; 725 struct rb_node rb; 726 struct shash_desc *log_hash; 727 }; 728 729 /** 730 * struct ubifs_jhead - journal head. 731 * @wbuf: head's write-buffer 732 * @buds_list: list of bud LEBs belonging to this journal head 733 * @grouped: non-zero if UBIFS groups nodes when writing to this journal head 734 * @log_hash: the log hash from the commit start node up to this journal head 735 * 736 * Note, the @buds list is protected by the @c->buds_lock. 737 */ 738 struct ubifs_jhead { 739 struct ubifs_wbuf wbuf; 740 struct list_head buds_list; 741 unsigned int grouped:1; 742 struct shash_desc *log_hash; 743 }; 744 745 /** 746 * struct ubifs_zbranch - key/coordinate/length branch stored in znodes. 747 * @key: key 748 * @znode: znode address in memory 749 * @lnum: LEB number of the target node (indexing node or data node) 750 * @offs: target node offset within @lnum 751 * @len: target node length 752 * @hash: the hash of the target node 753 */ 754 struct ubifs_zbranch { 755 union ubifs_key key; 756 union { 757 struct ubifs_znode *znode; 758 void *leaf; 759 }; 760 int lnum; 761 int offs; 762 int len; 763 u8 hash[UBIFS_HASH_ARR_SZ]; 764 }; 765 766 /** 767 * struct ubifs_znode - in-memory representation of an indexing node. 768 * @parent: parent znode or NULL if it is the root 769 * @cnext: next znode to commit 770 * @cparent: parent node for this commit 771 * @ciip: index in cparent's zbranch array 772 * @flags: znode flags (%DIRTY_ZNODE, %COW_ZNODE or %OBSOLETE_ZNODE) 773 * @time: last access time (seconds) 774 * @level: level of the entry in the TNC tree 775 * @child_cnt: count of child znodes 776 * @iip: index in parent's zbranch array 777 * @alt: lower bound of key range has altered i.e. child inserted at slot 0 778 * @lnum: LEB number of the corresponding indexing node 779 * @offs: offset of the corresponding indexing node 780 * @len: length of the corresponding indexing node 781 * @zbranch: array of znode branches (@c->fanout elements) 782 * 783 * Note! The @lnum, @offs, and @len fields are not really needed - we have them 784 * only for internal consistency check. They could be removed to save some RAM. 785 */ 786 struct ubifs_znode { 787 struct ubifs_znode *parent; 788 struct ubifs_znode *cnext; 789 struct ubifs_znode *cparent; 790 int ciip; 791 unsigned long flags; 792 time64_t time; 793 int level; 794 int child_cnt; 795 int iip; 796 int alt; 797 int lnum; 798 int offs; 799 int len; 800 struct ubifs_zbranch zbranch[]; 801 }; 802 803 /** 804 * struct bu_info - bulk-read information. 805 * @key: first data node key 806 * @zbranch: zbranches of data nodes to bulk read 807 * @buf: buffer to read into 808 * @buf_len: buffer length 809 * @gc_seq: GC sequence number to detect races with GC 810 * @cnt: number of data nodes for bulk read 811 * @blk_cnt: number of data blocks including holes 812 * @oef: end of file reached 813 */ 814 struct bu_info { 815 union ubifs_key key; 816 struct ubifs_zbranch zbranch[UBIFS_MAX_BULK_READ]; 817 void *buf; 818 int buf_len; 819 int gc_seq; 820 int cnt; 821 int blk_cnt; 822 int eof; 823 }; 824 825 /** 826 * struct ubifs_node_range - node length range description data structure. 827 * @len: fixed node length 828 * @min_len: minimum possible node length 829 * @max_len: maximum possible node length 830 * 831 * If @max_len is %0, the node has fixed length @len. 832 */ 833 struct ubifs_node_range { 834 union { 835 int len; 836 int min_len; 837 }; 838 int max_len; 839 }; 840 841 /** 842 * struct ubifs_compressor - UBIFS compressor description structure. 843 * @compr_type: compressor type (%UBIFS_COMPR_LZO, etc) 844 * @cc: cryptoapi compressor handle 845 * @comp_mutex: mutex used during compression 846 * @decomp_mutex: mutex used during decompression 847 * @name: compressor name 848 * @capi_name: cryptoapi compressor name 849 */ 850 struct ubifs_compressor { 851 int compr_type; 852 struct crypto_comp *cc; 853 struct mutex *comp_mutex; 854 struct mutex *decomp_mutex; 855 const char *name; 856 const char *capi_name; 857 }; 858 859 /** 860 * struct ubifs_budget_req - budget requirements of an operation. 861 * 862 * @fast: non-zero if the budgeting should try to acquire budget quickly and 863 * should not try to call write-back 864 * @recalculate: non-zero if @idx_growth, @data_growth, and @dd_growth fields 865 * have to be re-calculated 866 * @new_page: non-zero if the operation adds a new page 867 * @dirtied_page: non-zero if the operation makes a page dirty 868 * @new_dent: non-zero if the operation adds a new directory entry 869 * @mod_dent: non-zero if the operation removes or modifies an existing 870 * directory entry 871 * @new_ino: non-zero if the operation adds a new inode 872 * @new_ino_d: how much data newly created inode contains 873 * @dirtied_ino: how many inodes the operation makes dirty 874 * @dirtied_ino_d: how much data dirtied inode contains 875 * @idx_growth: how much the index will supposedly grow 876 * @data_growth: how much new data the operation will supposedly add 877 * @dd_growth: how much data that makes other data dirty the operation will 878 * supposedly add 879 * 880 * @idx_growth, @data_growth and @dd_growth are not used in budget request. The 881 * budgeting subsystem caches index and data growth values there to avoid 882 * re-calculating them when the budget is released. However, if @idx_growth is 883 * %-1, it is calculated by the release function using other fields. 884 * 885 * An inode may contain 4KiB of data at max., thus the widths of @new_ino_d 886 * is 13 bits, and @dirtied_ino_d - 15, because up to 4 inodes may be made 887 * dirty by the re-name operation. 888 * 889 * Note, UBIFS aligns node lengths to 8-bytes boundary, so the requester has to 890 * make sure the amount of inode data which contribute to @new_ino_d and 891 * @dirtied_ino_d fields are aligned. 892 */ 893 struct ubifs_budget_req { 894 unsigned int fast:1; 895 unsigned int recalculate:1; 896 #ifndef UBIFS_DEBUG 897 unsigned int new_page:1; 898 unsigned int dirtied_page:1; 899 unsigned int new_dent:1; 900 unsigned int mod_dent:1; 901 unsigned int new_ino:1; 902 unsigned int new_ino_d:13; 903 unsigned int dirtied_ino:4; 904 unsigned int dirtied_ino_d:15; 905 #else 906 /* Not bit-fields to check for overflows */ 907 unsigned int new_page; 908 unsigned int dirtied_page; 909 unsigned int new_dent; 910 unsigned int mod_dent; 911 unsigned int new_ino; 912 unsigned int new_ino_d; 913 unsigned int dirtied_ino; 914 unsigned int dirtied_ino_d; 915 #endif 916 int idx_growth; 917 int data_growth; 918 int dd_growth; 919 }; 920 921 /** 922 * struct ubifs_orphan - stores the inode number of an orphan. 923 * @rb: rb-tree node of rb-tree of orphans sorted by inode number 924 * @list: list head of list of orphans in order added 925 * @new_list: list head of list of orphans added since the last commit 926 * @child_list: list of xattr children if this orphan hosts xattrs, list head 927 * if this orphan is a xattr, not used otherwise. 928 * @cnext: next orphan to commit 929 * @dnext: next orphan to delete 930 * @inum: inode number 931 * @new: %1 => added since the last commit, otherwise %0 932 * @cmt: %1 => commit pending, otherwise %0 933 * @del: %1 => delete pending, otherwise %0 934 */ 935 struct ubifs_orphan { 936 struct rb_node rb; 937 struct list_head list; 938 struct list_head new_list; 939 struct list_head child_list; 940 struct ubifs_orphan *cnext; 941 struct ubifs_orphan *dnext; 942 ino_t inum; 943 unsigned new:1; 944 unsigned cmt:1; 945 unsigned del:1; 946 }; 947 948 /** 949 * struct ubifs_mount_opts - UBIFS-specific mount options information. 950 * @unmount_mode: selected unmount mode (%0 default, %1 normal, %2 fast) 951 * @bulk_read: enable/disable bulk-reads (%0 default, %1 disable, %2 enable) 952 * @chk_data_crc: enable/disable CRC data checking when reading data nodes 953 * (%0 default, %1 disable, %2 enable) 954 * @override_compr: override default compressor (%0 - do not override and use 955 * superblock compressor, %1 - override and use compressor 956 * specified in @compr_type) 957 * @compr_type: compressor type to override the superblock compressor with 958 * (%UBIFS_COMPR_NONE, etc) 959 */ 960 struct ubifs_mount_opts { 961 unsigned int unmount_mode:2; 962 unsigned int bulk_read:2; 963 unsigned int chk_data_crc:2; 964 unsigned int override_compr:1; 965 unsigned int compr_type:2; 966 }; 967 968 /** 969 * struct ubifs_budg_info - UBIFS budgeting information. 970 * @idx_growth: amount of bytes budgeted for index growth 971 * @data_growth: amount of bytes budgeted for cached data 972 * @dd_growth: amount of bytes budgeted for cached data that will make 973 * other data dirty 974 * @uncommitted_idx: amount of bytes were budgeted for growth of the index, but 975 * which still have to be taken into account because the index 976 * has not been committed so far 977 * @old_idx_sz: size of index on flash 978 * @min_idx_lebs: minimum number of LEBs required for the index 979 * @nospace: non-zero if the file-system does not have flash space (used as 980 * optimization) 981 * @nospace_rp: the same as @nospace, but additionally means that even reserved 982 * pool is full 983 * @page_budget: budget for a page (constant, never changed after mount) 984 * @inode_budget: budget for an inode (constant, never changed after mount) 985 * @dent_budget: budget for a directory entry (constant, never changed after 986 * mount) 987 */ 988 struct ubifs_budg_info { 989 long long idx_growth; 990 long long data_growth; 991 long long dd_growth; 992 long long uncommitted_idx; 993 unsigned long long old_idx_sz; 994 int min_idx_lebs; 995 unsigned int nospace:1; 996 unsigned int nospace_rp:1; 997 int page_budget; 998 int inode_budget; 999 int dent_budget; 1000 }; 1001 1002 /** 1003 * ubifs_stats_info - per-FS statistics information. 1004 * @magic_errors: number of bad magic numbers (will be reset with a new mount). 1005 * @node_errors: number of bad nodes (will be reset with a new mount). 1006 * @crc_errors: number of bad crcs (will be reset with a new mount). 1007 */ 1008 struct ubifs_stats_info { 1009 unsigned int magic_errors; 1010 unsigned int node_errors; 1011 unsigned int crc_errors; 1012 }; 1013 1014 struct ubifs_debug_info; 1015 1016 /** 1017 * struct ubifs_info - UBIFS file-system description data structure 1018 * (per-superblock). 1019 * @vfs_sb: VFS @struct super_block object 1020 * @sup_node: The super block node as read from the device 1021 * 1022 * @highest_inum: highest used inode number 1023 * @max_sqnum: current global sequence number 1024 * @cmt_no: commit number of the last successfully completed commit, protected 1025 * by @commit_sem 1026 * @cnt_lock: protects @highest_inum and @max_sqnum counters 1027 * @fmt_version: UBIFS on-flash format version 1028 * @ro_compat_version: R/O compatibility version 1029 * @uuid: UUID from super block 1030 * 1031 * @lhead_lnum: log head logical eraseblock number 1032 * @lhead_offs: log head offset 1033 * @ltail_lnum: log tail logical eraseblock number (offset is always 0) 1034 * @log_mutex: protects the log, @lhead_lnum, @lhead_offs, @ltail_lnum, and 1035 * @bud_bytes 1036 * @min_log_bytes: minimum required number of bytes in the log 1037 * @cmt_bud_bytes: used during commit to temporarily amount of bytes in 1038 * committed buds 1039 * 1040 * @buds: tree of all buds indexed by bud LEB number 1041 * @bud_bytes: how many bytes of flash is used by buds 1042 * @buds_lock: protects the @buds tree, @bud_bytes, and per-journal head bud 1043 * lists 1044 * @jhead_cnt: count of journal heads 1045 * @jheads: journal heads (head zero is base head) 1046 * @max_bud_bytes: maximum number of bytes allowed in buds 1047 * @bg_bud_bytes: number of bud bytes when background commit is initiated 1048 * @old_buds: buds to be released after commit ends 1049 * @max_bud_cnt: maximum number of buds 1050 * 1051 * @commit_sem: synchronizes committer with other processes 1052 * @cmt_state: commit state 1053 * @cs_lock: commit state lock 1054 * @cmt_wq: wait queue to sleep on if the log is full and a commit is running 1055 * 1056 * @big_lpt: flag that LPT is too big to write whole during commit 1057 * @space_fixup: flag indicating that free space in LEBs needs to be cleaned up 1058 * @double_hash: flag indicating that we can do lookups by hash 1059 * @encrypted: flag indicating that this file system contains encrypted files 1060 * @no_chk_data_crc: do not check CRCs when reading data nodes (except during 1061 * recovery) 1062 * @bulk_read: enable bulk-reads 1063 * @default_compr: default compression algorithm (%UBIFS_COMPR_LZO, etc) 1064 * @rw_incompat: the media is not R/W compatible 1065 * @assert_action: action to take when a ubifs_assert() fails 1066 * @authenticated: flag indigating the FS is mounted in authenticated mode 1067 * 1068 * @tnc_mutex: protects the Tree Node Cache (TNC), @zroot, @cnext, @enext, and 1069 * @calc_idx_sz 1070 * @zroot: zbranch which points to the root index node and znode 1071 * @cnext: next znode to commit 1072 * @enext: next znode to commit to empty space 1073 * @gap_lebs: array of LEBs used by the in-gaps commit method 1074 * @cbuf: commit buffer 1075 * @ileb_buf: buffer for commit in-the-gaps method 1076 * @ileb_len: length of data in ileb_buf 1077 * @ihead_lnum: LEB number of index head 1078 * @ihead_offs: offset of index head 1079 * @ilebs: pre-allocated index LEBs 1080 * @ileb_cnt: number of pre-allocated index LEBs 1081 * @ileb_nxt: next pre-allocated index LEBs 1082 * @old_idx: tree of index nodes obsoleted since the last commit start 1083 * @bottom_up_buf: a buffer which is used by 'dirty_cow_bottom_up()' in tnc.c 1084 * 1085 * @mst_node: master node 1086 * @mst_offs: offset of valid master node 1087 * 1088 * @max_bu_buf_len: maximum bulk-read buffer length 1089 * @bu_mutex: protects the pre-allocated bulk-read buffer and @c->bu 1090 * @bu: pre-allocated bulk-read information 1091 * 1092 * @write_reserve_mutex: protects @write_reserve_buf 1093 * @write_reserve_buf: on the write path we allocate memory, which might 1094 * sometimes be unavailable, in which case we use this 1095 * write reserve buffer 1096 * 1097 * @log_lebs: number of logical eraseblocks in the log 1098 * @log_bytes: log size in bytes 1099 * @log_last: last LEB of the log 1100 * @lpt_lebs: number of LEBs used for lprops table 1101 * @lpt_first: first LEB of the lprops table area 1102 * @lpt_last: last LEB of the lprops table area 1103 * @orph_lebs: number of LEBs used for the orphan area 1104 * @orph_first: first LEB of the orphan area 1105 * @orph_last: last LEB of the orphan area 1106 * @main_lebs: count of LEBs in the main area 1107 * @main_first: first LEB of the main area 1108 * @main_bytes: main area size in bytes 1109 * 1110 * @key_hash_type: type of the key hash 1111 * @key_hash: direntry key hash function 1112 * @key_fmt: key format 1113 * @key_len: key length 1114 * @hash_len: The length of the index node hashes 1115 * @fanout: fanout of the index tree (number of links per indexing node) 1116 * 1117 * @min_io_size: minimal input/output unit size 1118 * @min_io_shift: number of bits in @min_io_size minus one 1119 * @max_write_size: maximum amount of bytes the underlying flash can write at a 1120 * time (MTD write buffer size) 1121 * @max_write_shift: number of bits in @max_write_size minus one 1122 * @leb_size: logical eraseblock size in bytes 1123 * @leb_start: starting offset of logical eraseblocks within physical 1124 * eraseblocks 1125 * @half_leb_size: half LEB size 1126 * @idx_leb_size: how many bytes of an LEB are effectively available when it is 1127 * used to store indexing nodes (@leb_size - @max_idx_node_sz) 1128 * @leb_cnt: count of logical eraseblocks 1129 * @max_leb_cnt: maximum count of logical eraseblocks 1130 * @ro_media: the underlying UBI volume is read-only 1131 * @ro_mount: the file-system was mounted as read-only 1132 * @ro_error: UBIFS switched to R/O mode because an error happened 1133 * 1134 * @dirty_pg_cnt: number of dirty pages (not used) 1135 * @dirty_zn_cnt: number of dirty znodes 1136 * @clean_zn_cnt: number of clean znodes 1137 * 1138 * @space_lock: protects @bi and @lst 1139 * @lst: lprops statistics 1140 * @bi: budgeting information 1141 * @calc_idx_sz: temporary variable which is used to calculate new index size 1142 * (contains accurate new index size at end of TNC commit start) 1143 * 1144 * @ref_node_alsz: size of the LEB reference node aligned to the min. flash 1145 * I/O unit 1146 * @mst_node_alsz: master node aligned size 1147 * @min_idx_node_sz: minimum indexing node aligned on 8-bytes boundary 1148 * @max_idx_node_sz: maximum indexing node aligned on 8-bytes boundary 1149 * @max_inode_sz: maximum possible inode size in bytes 1150 * @max_znode_sz: size of znode in bytes 1151 * 1152 * @leb_overhead: how many bytes are wasted in an LEB when it is filled with 1153 * data nodes of maximum size - used in free space reporting 1154 * @dead_wm: LEB dead space watermark 1155 * @dark_wm: LEB dark space watermark 1156 * @block_cnt: count of 4KiB blocks on the FS 1157 * 1158 * @ranges: UBIFS node length ranges 1159 * @ubi: UBI volume descriptor 1160 * @di: UBI device information 1161 * @vi: UBI volume information 1162 * 1163 * @orph_tree: rb-tree of orphan inode numbers 1164 * @orph_list: list of orphan inode numbers in order added 1165 * @orph_new: list of orphan inode numbers added since last commit 1166 * @orph_cnext: next orphan to commit 1167 * @orph_dnext: next orphan to delete 1168 * @orphan_lock: lock for orph_tree and orph_new 1169 * @orph_buf: buffer for orphan nodes 1170 * @new_orphans: number of orphans since last commit 1171 * @cmt_orphans: number of orphans being committed 1172 * @tot_orphans: number of orphans in the rb_tree 1173 * @max_orphans: maximum number of orphans allowed 1174 * @ohead_lnum: orphan head LEB number 1175 * @ohead_offs: orphan head offset 1176 * @no_orphs: non-zero if there are no orphans 1177 * 1178 * @bgt: UBIFS background thread 1179 * @bgt_name: background thread name 1180 * @need_bgt: if background thread should run 1181 * @need_wbuf_sync: if write-buffers have to be synchronized 1182 * 1183 * @gc_lnum: LEB number used for garbage collection 1184 * @sbuf: a buffer of LEB size used by GC and replay for scanning 1185 * @idx_gc: list of index LEBs that have been garbage collected 1186 * @idx_gc_cnt: number of elements on the idx_gc list 1187 * @gc_seq: incremented for every non-index LEB garbage collected 1188 * @gced_lnum: last non-index LEB that was garbage collected 1189 * 1190 * @infos_list: links all 'ubifs_info' objects 1191 * @umount_mutex: serializes shrinker and un-mount 1192 * @shrinker_run_no: shrinker run number 1193 * 1194 * @space_bits: number of bits needed to record free or dirty space 1195 * @lpt_lnum_bits: number of bits needed to record a LEB number in the LPT 1196 * @lpt_offs_bits: number of bits needed to record an offset in the LPT 1197 * @lpt_spc_bits: number of bits needed to space in the LPT 1198 * @pcnt_bits: number of bits needed to record pnode or nnode number 1199 * @lnum_bits: number of bits needed to record LEB number 1200 * @nnode_sz: size of on-flash nnode 1201 * @pnode_sz: size of on-flash pnode 1202 * @ltab_sz: size of on-flash LPT lprops table 1203 * @lsave_sz: size of on-flash LPT save table 1204 * @pnode_cnt: number of pnodes 1205 * @nnode_cnt: number of nnodes 1206 * @lpt_hght: height of the LPT 1207 * @pnodes_have: number of pnodes in memory 1208 * 1209 * @lp_mutex: protects lprops table and all the other lprops-related fields 1210 * @lpt_lnum: LEB number of the root nnode of the LPT 1211 * @lpt_offs: offset of the root nnode of the LPT 1212 * @nhead_lnum: LEB number of LPT head 1213 * @nhead_offs: offset of LPT head 1214 * @lpt_drty_flgs: dirty flags for LPT special nodes e.g. ltab 1215 * @dirty_nn_cnt: number of dirty nnodes 1216 * @dirty_pn_cnt: number of dirty pnodes 1217 * @check_lpt_free: flag that indicates LPT GC may be needed 1218 * @lpt_sz: LPT size 1219 * @lpt_nod_buf: buffer for an on-flash nnode or pnode 1220 * @lpt_buf: buffer of LEB size used by LPT 1221 * @nroot: address in memory of the root nnode of the LPT 1222 * @lpt_cnext: next LPT node to commit 1223 * @lpt_heap: array of heaps of categorized lprops 1224 * @dirty_idx: a (reverse sorted) copy of the LPROPS_DIRTY_IDX heap as at 1225 * previous commit start 1226 * @uncat_list: list of un-categorized LEBs 1227 * @empty_list: list of empty LEBs 1228 * @freeable_list: list of freeable non-index LEBs (free + dirty == @leb_size) 1229 * @frdi_idx_list: list of freeable index LEBs (free + dirty == @leb_size) 1230 * @freeable_cnt: number of freeable LEBs in @freeable_list 1231 * @in_a_category_cnt: count of lprops which are in a certain category, which 1232 * basically meants that they were loaded from the flash 1233 * 1234 * @ltab_lnum: LEB number of LPT's own lprops table 1235 * @ltab_offs: offset of LPT's own lprops table 1236 * @ltab: LPT's own lprops table 1237 * @ltab_cmt: LPT's own lprops table (commit copy) 1238 * @lsave_cnt: number of LEB numbers in LPT's save table 1239 * @lsave_lnum: LEB number of LPT's save table 1240 * @lsave_offs: offset of LPT's save table 1241 * @lsave: LPT's save table 1242 * @lscan_lnum: LEB number of last LPT scan 1243 * 1244 * @rp_size: size of the reserved pool in bytes 1245 * @report_rp_size: size of the reserved pool reported to user-space 1246 * @rp_uid: reserved pool user ID 1247 * @rp_gid: reserved pool group ID 1248 * 1249 * @hash_tfm: the hash transformation used for hashing nodes 1250 * @hmac_tfm: the HMAC transformation for this filesystem 1251 * @hmac_desc_len: length of the HMAC used for authentication 1252 * @auth_key_name: the authentication key name 1253 * @auth_hash_name: the name of the hash algorithm used for authentication 1254 * @auth_hash_algo: the authentication hash used for this fs 1255 * @log_hash: the log hash from the commit start node up to the latest reference 1256 * node. 1257 * 1258 * @empty: %1 if the UBI device is empty 1259 * @need_recovery: %1 if the file-system needs recovery 1260 * @replaying: %1 during journal replay 1261 * @mounting: %1 while mounting 1262 * @probing: %1 while attempting to mount if SB_SILENT mount flag is set 1263 * @remounting_rw: %1 while re-mounting from R/O mode to R/W mode 1264 * @replay_list: temporary list used during journal replay 1265 * @replay_buds: list of buds to replay 1266 * @cs_sqnum: sequence number of first node in the log (commit start node) 1267 * @unclean_leb_list: LEBs to recover when re-mounting R/O mounted FS to R/W 1268 * mode 1269 * @rcvrd_mst_node: recovered master node to write when re-mounting R/O mounted 1270 * FS to R/W mode 1271 * @size_tree: inode size information for recovery 1272 * @mount_opts: UBIFS-specific mount options 1273 * 1274 * @dbg: debugging-related information 1275 * @stats: statistics exported over sysfs 1276 * 1277 * @kobj: kobject for /sys/fs/ubifs/ 1278 * @kobj_unregister: completion to unregister sysfs kobject 1279 */ 1280 struct ubifs_info { 1281 struct super_block *vfs_sb; 1282 struct ubifs_sb_node *sup_node; 1283 1284 ino_t highest_inum; 1285 unsigned long long max_sqnum; 1286 unsigned long long cmt_no; 1287 spinlock_t cnt_lock; 1288 int fmt_version; 1289 int ro_compat_version; 1290 unsigned char uuid[16]; 1291 1292 int lhead_lnum; 1293 int lhead_offs; 1294 int ltail_lnum; 1295 struct mutex log_mutex; 1296 int min_log_bytes; 1297 long long cmt_bud_bytes; 1298 1299 struct rb_root buds; 1300 long long bud_bytes; 1301 spinlock_t buds_lock; 1302 int jhead_cnt; 1303 struct ubifs_jhead *jheads; 1304 long long max_bud_bytes; 1305 long long bg_bud_bytes; 1306 struct list_head old_buds; 1307 int max_bud_cnt; 1308 1309 struct rw_semaphore commit_sem; 1310 int cmt_state; 1311 spinlock_t cs_lock; 1312 wait_queue_head_t cmt_wq; 1313 1314 struct kobject kobj; 1315 struct completion kobj_unregister; 1316 1317 unsigned int big_lpt:1; 1318 unsigned int space_fixup:1; 1319 unsigned int double_hash:1; 1320 unsigned int encrypted:1; 1321 unsigned int no_chk_data_crc:1; 1322 unsigned int bulk_read:1; 1323 unsigned int default_compr:2; 1324 unsigned int rw_incompat:1; 1325 unsigned int assert_action:2; 1326 unsigned int authenticated:1; 1327 unsigned int superblock_need_write:1; 1328 1329 struct mutex tnc_mutex; 1330 struct ubifs_zbranch zroot; 1331 struct ubifs_znode *cnext; 1332 struct ubifs_znode *enext; 1333 int *gap_lebs; 1334 void *cbuf; 1335 void *ileb_buf; 1336 int ileb_len; 1337 int ihead_lnum; 1338 int ihead_offs; 1339 int *ilebs; 1340 int ileb_cnt; 1341 int ileb_nxt; 1342 struct rb_root old_idx; 1343 int *bottom_up_buf; 1344 1345 struct ubifs_mst_node *mst_node; 1346 int mst_offs; 1347 1348 int max_bu_buf_len; 1349 struct mutex bu_mutex; 1350 struct bu_info bu; 1351 1352 struct mutex write_reserve_mutex; 1353 void *write_reserve_buf; 1354 1355 int log_lebs; 1356 long long log_bytes; 1357 int log_last; 1358 int lpt_lebs; 1359 int lpt_first; 1360 int lpt_last; 1361 int orph_lebs; 1362 int orph_first; 1363 int orph_last; 1364 int main_lebs; 1365 int main_first; 1366 long long main_bytes; 1367 1368 uint8_t key_hash_type; 1369 uint32_t (*key_hash)(const char *str, int len); 1370 int key_fmt; 1371 int key_len; 1372 int hash_len; 1373 int fanout; 1374 1375 int min_io_size; 1376 int min_io_shift; 1377 int max_write_size; 1378 int max_write_shift; 1379 int leb_size; 1380 int leb_start; 1381 int half_leb_size; 1382 int idx_leb_size; 1383 int leb_cnt; 1384 int max_leb_cnt; 1385 unsigned int ro_media:1; 1386 unsigned int ro_mount:1; 1387 unsigned int ro_error:1; 1388 1389 atomic_long_t dirty_pg_cnt; 1390 atomic_long_t dirty_zn_cnt; 1391 atomic_long_t clean_zn_cnt; 1392 1393 spinlock_t space_lock; 1394 struct ubifs_lp_stats lst; 1395 struct ubifs_budg_info bi; 1396 unsigned long long calc_idx_sz; 1397 1398 int ref_node_alsz; 1399 int mst_node_alsz; 1400 int min_idx_node_sz; 1401 int max_idx_node_sz; 1402 long long max_inode_sz; 1403 int max_znode_sz; 1404 1405 int leb_overhead; 1406 int dead_wm; 1407 int dark_wm; 1408 int block_cnt; 1409 1410 struct ubifs_node_range ranges[UBIFS_NODE_TYPES_CNT]; 1411 struct ubi_volume_desc *ubi; 1412 struct ubi_device_info di; 1413 struct ubi_volume_info vi; 1414 1415 struct rb_root orph_tree; 1416 struct list_head orph_list; 1417 struct list_head orph_new; 1418 struct ubifs_orphan *orph_cnext; 1419 struct ubifs_orphan *orph_dnext; 1420 spinlock_t orphan_lock; 1421 void *orph_buf; 1422 int new_orphans; 1423 int cmt_orphans; 1424 int tot_orphans; 1425 int max_orphans; 1426 int ohead_lnum; 1427 int ohead_offs; 1428 int no_orphs; 1429 1430 struct task_struct *bgt; 1431 char bgt_name[sizeof(BGT_NAME_PATTERN) + 9]; 1432 int need_bgt; 1433 int need_wbuf_sync; 1434 1435 int gc_lnum; 1436 void *sbuf; 1437 struct list_head idx_gc; 1438 int idx_gc_cnt; 1439 int gc_seq; 1440 int gced_lnum; 1441 1442 struct list_head infos_list; 1443 struct mutex umount_mutex; 1444 unsigned int shrinker_run_no; 1445 1446 int space_bits; 1447 int lpt_lnum_bits; 1448 int lpt_offs_bits; 1449 int lpt_spc_bits; 1450 int pcnt_bits; 1451 int lnum_bits; 1452 int nnode_sz; 1453 int pnode_sz; 1454 int ltab_sz; 1455 int lsave_sz; 1456 int pnode_cnt; 1457 int nnode_cnt; 1458 int lpt_hght; 1459 int pnodes_have; 1460 1461 struct mutex lp_mutex; 1462 int lpt_lnum; 1463 int lpt_offs; 1464 int nhead_lnum; 1465 int nhead_offs; 1466 int lpt_drty_flgs; 1467 int dirty_nn_cnt; 1468 int dirty_pn_cnt; 1469 int check_lpt_free; 1470 long long lpt_sz; 1471 void *lpt_nod_buf; 1472 void *lpt_buf; 1473 struct ubifs_nnode *nroot; 1474 struct ubifs_cnode *lpt_cnext; 1475 struct ubifs_lpt_heap lpt_heap[LPROPS_HEAP_CNT]; 1476 struct ubifs_lpt_heap dirty_idx; 1477 struct list_head uncat_list; 1478 struct list_head empty_list; 1479 struct list_head freeable_list; 1480 struct list_head frdi_idx_list; 1481 int freeable_cnt; 1482 int in_a_category_cnt; 1483 1484 int ltab_lnum; 1485 int ltab_offs; 1486 struct ubifs_lpt_lprops *ltab; 1487 struct ubifs_lpt_lprops *ltab_cmt; 1488 int lsave_cnt; 1489 int lsave_lnum; 1490 int lsave_offs; 1491 int *lsave; 1492 int lscan_lnum; 1493 1494 long long rp_size; 1495 long long report_rp_size; 1496 kuid_t rp_uid; 1497 kgid_t rp_gid; 1498 1499 struct crypto_shash *hash_tfm; 1500 struct crypto_shash *hmac_tfm; 1501 int hmac_desc_len; 1502 char *auth_key_name; 1503 char *auth_hash_name; 1504 enum hash_algo auth_hash_algo; 1505 1506 struct shash_desc *log_hash; 1507 1508 /* The below fields are used only during mounting and re-mounting */ 1509 unsigned int empty:1; 1510 unsigned int need_recovery:1; 1511 unsigned int replaying:1; 1512 unsigned int mounting:1; 1513 unsigned int remounting_rw:1; 1514 unsigned int probing:1; 1515 struct list_head replay_list; 1516 struct list_head replay_buds; 1517 unsigned long long cs_sqnum; 1518 struct list_head unclean_leb_list; 1519 struct ubifs_mst_node *rcvrd_mst_node; 1520 struct rb_root size_tree; 1521 struct ubifs_mount_opts mount_opts; 1522 1523 struct ubifs_debug_info *dbg; 1524 struct ubifs_stats_info *stats; 1525 }; 1526 1527 extern struct list_head ubifs_infos; 1528 extern spinlock_t ubifs_infos_lock; 1529 extern atomic_long_t ubifs_clean_zn_cnt; 1530 extern const struct super_operations ubifs_super_operations; 1531 extern const struct address_space_operations ubifs_file_address_operations; 1532 extern const struct file_operations ubifs_file_operations; 1533 extern const struct inode_operations ubifs_file_inode_operations; 1534 extern const struct file_operations ubifs_dir_operations; 1535 extern const struct inode_operations ubifs_dir_inode_operations; 1536 extern const struct inode_operations ubifs_symlink_inode_operations; 1537 extern struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT]; 1538 extern int ubifs_default_version; 1539 1540 /* auth.c */ 1541 static inline int ubifs_authenticated(const struct ubifs_info *c) 1542 { 1543 return (IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION)) && c->authenticated; 1544 } 1545 1546 struct shash_desc *__ubifs_hash_get_desc(const struct ubifs_info *c); 1547 static inline struct shash_desc *ubifs_hash_get_desc(const struct ubifs_info *c) 1548 { 1549 return ubifs_authenticated(c) ? __ubifs_hash_get_desc(c) : NULL; 1550 } 1551 1552 static inline int ubifs_shash_init(const struct ubifs_info *c, 1553 struct shash_desc *desc) 1554 { 1555 if (ubifs_authenticated(c)) 1556 return crypto_shash_init(desc); 1557 else 1558 return 0; 1559 } 1560 1561 static inline int ubifs_shash_update(const struct ubifs_info *c, 1562 struct shash_desc *desc, const void *buf, 1563 unsigned int len) 1564 { 1565 int err = 0; 1566 1567 if (ubifs_authenticated(c)) { 1568 err = crypto_shash_update(desc, buf, len); 1569 if (err < 0) 1570 return err; 1571 } 1572 1573 return 0; 1574 } 1575 1576 static inline int ubifs_shash_final(const struct ubifs_info *c, 1577 struct shash_desc *desc, u8 *out) 1578 { 1579 return ubifs_authenticated(c) ? crypto_shash_final(desc, out) : 0; 1580 } 1581 1582 int __ubifs_node_calc_hash(const struct ubifs_info *c, const void *buf, 1583 u8 *hash); 1584 static inline int ubifs_node_calc_hash(const struct ubifs_info *c, 1585 const void *buf, u8 *hash) 1586 { 1587 if (ubifs_authenticated(c)) 1588 return __ubifs_node_calc_hash(c, buf, hash); 1589 else 1590 return 0; 1591 } 1592 1593 int ubifs_prepare_auth_node(struct ubifs_info *c, void *node, 1594 struct shash_desc *inhash); 1595 1596 /** 1597 * ubifs_check_hash - compare two hashes 1598 * @c: UBIFS file-system description object 1599 * @expected: first hash 1600 * @got: second hash 1601 * 1602 * Compare two hashes @expected and @got. Returns 0 when they are equal, a 1603 * negative error code otherwise. 1604 */ 1605 static inline int ubifs_check_hash(const struct ubifs_info *c, 1606 const u8 *expected, const u8 *got) 1607 { 1608 return crypto_memneq(expected, got, c->hash_len); 1609 } 1610 1611 /** 1612 * ubifs_check_hmac - compare two HMACs 1613 * @c: UBIFS file-system description object 1614 * @expected: first HMAC 1615 * @got: second HMAC 1616 * 1617 * Compare two hashes @expected and @got. Returns 0 when they are equal, a 1618 * negative error code otherwise. 1619 */ 1620 static inline int ubifs_check_hmac(const struct ubifs_info *c, 1621 const u8 *expected, const u8 *got) 1622 { 1623 return crypto_memneq(expected, got, c->hmac_desc_len); 1624 } 1625 1626 void ubifs_bad_hash(const struct ubifs_info *c, const void *node, 1627 const u8 *hash, int lnum, int offs); 1628 1629 int __ubifs_node_check_hash(const struct ubifs_info *c, const void *buf, 1630 const u8 *expected); 1631 static inline int ubifs_node_check_hash(const struct ubifs_info *c, 1632 const void *buf, const u8 *expected) 1633 { 1634 if (ubifs_authenticated(c)) 1635 return __ubifs_node_check_hash(c, buf, expected); 1636 else 1637 return 0; 1638 } 1639 1640 int ubifs_init_authentication(struct ubifs_info *c); 1641 void __ubifs_exit_authentication(struct ubifs_info *c); 1642 static inline void ubifs_exit_authentication(struct ubifs_info *c) 1643 { 1644 if (ubifs_authenticated(c)) 1645 __ubifs_exit_authentication(c); 1646 } 1647 1648 /** 1649 * ubifs_branch_hash - returns a pointer to the hash of a branch 1650 * @c: UBIFS file-system description object 1651 * @br: branch to get the hash from 1652 * 1653 * This returns a pointer to the hash of a branch. Since the key already is a 1654 * dynamically sized object we cannot use a struct member here. 1655 */ 1656 static inline u8 *ubifs_branch_hash(struct ubifs_info *c, 1657 struct ubifs_branch *br) 1658 { 1659 return (void *)br + sizeof(*br) + c->key_len; 1660 } 1661 1662 /** 1663 * ubifs_copy_hash - copy a hash 1664 * @c: UBIFS file-system description object 1665 * @from: source hash 1666 * @to: destination hash 1667 * 1668 * With authentication this copies a hash, otherwise does nothing. 1669 */ 1670 static inline void ubifs_copy_hash(const struct ubifs_info *c, const u8 *from, 1671 u8 *to) 1672 { 1673 if (ubifs_authenticated(c)) 1674 memcpy(to, from, c->hash_len); 1675 } 1676 1677 int __ubifs_node_insert_hmac(const struct ubifs_info *c, void *buf, 1678 int len, int ofs_hmac); 1679 static inline int ubifs_node_insert_hmac(const struct ubifs_info *c, void *buf, 1680 int len, int ofs_hmac) 1681 { 1682 if (ubifs_authenticated(c)) 1683 return __ubifs_node_insert_hmac(c, buf, len, ofs_hmac); 1684 else 1685 return 0; 1686 } 1687 1688 int __ubifs_node_verify_hmac(const struct ubifs_info *c, const void *buf, 1689 int len, int ofs_hmac); 1690 static inline int ubifs_node_verify_hmac(const struct ubifs_info *c, 1691 const void *buf, int len, int ofs_hmac) 1692 { 1693 if (ubifs_authenticated(c)) 1694 return __ubifs_node_verify_hmac(c, buf, len, ofs_hmac); 1695 else 1696 return 0; 1697 } 1698 1699 /** 1700 * ubifs_auth_node_sz - returns the size of an authentication node 1701 * @c: UBIFS file-system description object 1702 * 1703 * This function returns the size of an authentication node which can 1704 * be 0 for unauthenticated filesystems or the real size of an auth node 1705 * authentication is enabled. 1706 */ 1707 static inline int ubifs_auth_node_sz(const struct ubifs_info *c) 1708 { 1709 if (ubifs_authenticated(c)) 1710 return sizeof(struct ubifs_auth_node) + c->hmac_desc_len; 1711 else 1712 return 0; 1713 } 1714 int ubifs_sb_verify_signature(struct ubifs_info *c, 1715 const struct ubifs_sb_node *sup); 1716 bool ubifs_hmac_zero(struct ubifs_info *c, const u8 *hmac); 1717 1718 int ubifs_hmac_wkm(struct ubifs_info *c, u8 *hmac); 1719 1720 int __ubifs_shash_copy_state(const struct ubifs_info *c, struct shash_desc *src, 1721 struct shash_desc *target); 1722 static inline int ubifs_shash_copy_state(const struct ubifs_info *c, 1723 struct shash_desc *src, 1724 struct shash_desc *target) 1725 { 1726 if (ubifs_authenticated(c)) 1727 return __ubifs_shash_copy_state(c, src, target); 1728 else 1729 return 0; 1730 } 1731 1732 /* io.c */ 1733 void ubifs_ro_mode(struct ubifs_info *c, int err); 1734 int ubifs_leb_read(const struct ubifs_info *c, int lnum, void *buf, int offs, 1735 int len, int even_ebadmsg); 1736 int ubifs_leb_write(struct ubifs_info *c, int lnum, const void *buf, int offs, 1737 int len); 1738 int ubifs_leb_change(struct ubifs_info *c, int lnum, const void *buf, int len); 1739 int ubifs_leb_unmap(struct ubifs_info *c, int lnum); 1740 int ubifs_leb_map(struct ubifs_info *c, int lnum); 1741 int ubifs_is_mapped(const struct ubifs_info *c, int lnum); 1742 int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len); 1743 int ubifs_wbuf_seek_nolock(struct ubifs_wbuf *wbuf, int lnum, int offs); 1744 int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf); 1745 int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len, 1746 int lnum, int offs); 1747 int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len, 1748 int lnum, int offs); 1749 int ubifs_write_node(struct ubifs_info *c, void *node, int len, int lnum, 1750 int offs); 1751 int ubifs_write_node_hmac(struct ubifs_info *c, void *buf, int len, int lnum, 1752 int offs, int hmac_offs); 1753 int ubifs_check_node(const struct ubifs_info *c, const void *buf, int len, 1754 int lnum, int offs, int quiet, int must_chk_crc); 1755 void ubifs_init_node(struct ubifs_info *c, void *buf, int len, int pad); 1756 void ubifs_crc_node(struct ubifs_info *c, void *buf, int len); 1757 void ubifs_prepare_node(struct ubifs_info *c, void *buf, int len, int pad); 1758 int ubifs_prepare_node_hmac(struct ubifs_info *c, void *node, int len, 1759 int hmac_offs, int pad); 1760 void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last); 1761 int ubifs_io_init(struct ubifs_info *c); 1762 void ubifs_pad(const struct ubifs_info *c, void *buf, int pad); 1763 int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf); 1764 int ubifs_bg_wbufs_sync(struct ubifs_info *c); 1765 void ubifs_wbuf_add_ino_nolock(struct ubifs_wbuf *wbuf, ino_t inum); 1766 int ubifs_sync_wbufs_by_inode(struct ubifs_info *c, struct inode *inode); 1767 1768 /* scan.c */ 1769 struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum, 1770 int offs, void *sbuf, int quiet); 1771 void ubifs_scan_destroy(struct ubifs_scan_leb *sleb); 1772 int ubifs_scan_a_node(const struct ubifs_info *c, void *buf, int len, int lnum, 1773 int offs, int quiet); 1774 struct ubifs_scan_leb *ubifs_start_scan(const struct ubifs_info *c, int lnum, 1775 int offs, void *sbuf); 1776 void ubifs_end_scan(const struct ubifs_info *c, struct ubifs_scan_leb *sleb, 1777 int lnum, int offs); 1778 int ubifs_add_snod(const struct ubifs_info *c, struct ubifs_scan_leb *sleb, 1779 void *buf, int offs); 1780 void ubifs_scanned_corruption(const struct ubifs_info *c, int lnum, int offs, 1781 void *buf); 1782 1783 /* log.c */ 1784 void ubifs_add_bud(struct ubifs_info *c, struct ubifs_bud *bud); 1785 void ubifs_create_buds_lists(struct ubifs_info *c); 1786 int ubifs_add_bud_to_log(struct ubifs_info *c, int jhead, int lnum, int offs); 1787 struct ubifs_bud *ubifs_search_bud(struct ubifs_info *c, int lnum); 1788 struct ubifs_wbuf *ubifs_get_wbuf(struct ubifs_info *c, int lnum); 1789 int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum); 1790 int ubifs_log_end_commit(struct ubifs_info *c, int new_ltail_lnum); 1791 int ubifs_log_post_commit(struct ubifs_info *c, int old_ltail_lnum); 1792 int ubifs_consolidate_log(struct ubifs_info *c); 1793 1794 /* journal.c */ 1795 int ubifs_jnl_update(struct ubifs_info *c, const struct inode *dir, 1796 const struct fscrypt_name *nm, const struct inode *inode, 1797 int deletion, int xent); 1798 int ubifs_jnl_write_data(struct ubifs_info *c, const struct inode *inode, 1799 const union ubifs_key *key, const void *buf, int len); 1800 int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode); 1801 int ubifs_jnl_delete_inode(struct ubifs_info *c, const struct inode *inode); 1802 int ubifs_jnl_xrename(struct ubifs_info *c, const struct inode *fst_dir, 1803 const struct inode *fst_inode, 1804 const struct fscrypt_name *fst_nm, 1805 const struct inode *snd_dir, 1806 const struct inode *snd_inode, 1807 const struct fscrypt_name *snd_nm, int sync); 1808 int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir, 1809 const struct inode *old_inode, 1810 const struct fscrypt_name *old_nm, 1811 const struct inode *new_dir, 1812 const struct inode *new_inode, 1813 const struct fscrypt_name *new_nm, 1814 const struct inode *whiteout, int sync); 1815 int ubifs_jnl_truncate(struct ubifs_info *c, const struct inode *inode, 1816 loff_t old_size, loff_t new_size); 1817 int ubifs_jnl_delete_xattr(struct ubifs_info *c, const struct inode *host, 1818 const struct inode *inode, const struct fscrypt_name *nm); 1819 int ubifs_jnl_change_xattr(struct ubifs_info *c, const struct inode *inode1, 1820 const struct inode *inode2); 1821 1822 /* budget.c */ 1823 int ubifs_budget_space(struct ubifs_info *c, struct ubifs_budget_req *req); 1824 void ubifs_release_budget(struct ubifs_info *c, struct ubifs_budget_req *req); 1825 void ubifs_release_dirty_inode_budget(struct ubifs_info *c, 1826 struct ubifs_inode *ui); 1827 int ubifs_budget_inode_op(struct ubifs_info *c, struct inode *inode, 1828 struct ubifs_budget_req *req); 1829 void ubifs_release_ino_dirty(struct ubifs_info *c, struct inode *inode, 1830 struct ubifs_budget_req *req); 1831 void ubifs_cancel_ino_op(struct ubifs_info *c, struct inode *inode, 1832 struct ubifs_budget_req *req); 1833 long long ubifs_get_free_space(struct ubifs_info *c); 1834 long long ubifs_get_free_space_nolock(struct ubifs_info *c); 1835 int ubifs_calc_min_idx_lebs(struct ubifs_info *c); 1836 void ubifs_convert_page_budget(struct ubifs_info *c); 1837 long long ubifs_reported_space(const struct ubifs_info *c, long long free); 1838 long long ubifs_calc_available(const struct ubifs_info *c, int min_idx_lebs); 1839 1840 /* find.c */ 1841 int ubifs_find_free_space(struct ubifs_info *c, int min_space, int *offs, 1842 int squeeze); 1843 int ubifs_find_free_leb_for_idx(struct ubifs_info *c); 1844 int ubifs_find_dirty_leb(struct ubifs_info *c, struct ubifs_lprops *ret_lp, 1845 int min_space, int pick_free); 1846 int ubifs_find_dirty_idx_leb(struct ubifs_info *c); 1847 int ubifs_save_dirty_idx_lnums(struct ubifs_info *c); 1848 1849 /* tnc.c */ 1850 int ubifs_lookup_level0(struct ubifs_info *c, const union ubifs_key *key, 1851 struct ubifs_znode **zn, int *n); 1852 int ubifs_tnc_lookup_nm(struct ubifs_info *c, const union ubifs_key *key, 1853 void *node, const struct fscrypt_name *nm); 1854 int ubifs_tnc_lookup_dh(struct ubifs_info *c, const union ubifs_key *key, 1855 void *node, uint32_t secondary_hash); 1856 int ubifs_tnc_locate(struct ubifs_info *c, const union ubifs_key *key, 1857 void *node, int *lnum, int *offs); 1858 int ubifs_tnc_add(struct ubifs_info *c, const union ubifs_key *key, int lnum, 1859 int offs, int len, const u8 *hash); 1860 int ubifs_tnc_replace(struct ubifs_info *c, const union ubifs_key *key, 1861 int old_lnum, int old_offs, int lnum, int offs, int len); 1862 int ubifs_tnc_add_nm(struct ubifs_info *c, const union ubifs_key *key, 1863 int lnum, int offs, int len, const u8 *hash, 1864 const struct fscrypt_name *nm); 1865 int ubifs_tnc_remove(struct ubifs_info *c, const union ubifs_key *key); 1866 int ubifs_tnc_remove_nm(struct ubifs_info *c, const union ubifs_key *key, 1867 const struct fscrypt_name *nm); 1868 int ubifs_tnc_remove_dh(struct ubifs_info *c, const union ubifs_key *key, 1869 uint32_t cookie); 1870 int ubifs_tnc_remove_range(struct ubifs_info *c, union ubifs_key *from_key, 1871 union ubifs_key *to_key); 1872 int ubifs_tnc_remove_ino(struct ubifs_info *c, ino_t inum); 1873 struct ubifs_dent_node *ubifs_tnc_next_ent(struct ubifs_info *c, 1874 union ubifs_key *key, 1875 const struct fscrypt_name *nm); 1876 void ubifs_tnc_close(struct ubifs_info *c); 1877 int ubifs_tnc_has_node(struct ubifs_info *c, union ubifs_key *key, int level, 1878 int lnum, int offs, int is_idx); 1879 int ubifs_dirty_idx_node(struct ubifs_info *c, union ubifs_key *key, int level, 1880 int lnum, int offs); 1881 /* Shared by tnc.c for tnc_commit.c */ 1882 void destroy_old_idx(struct ubifs_info *c); 1883 int is_idx_node_in_tnc(struct ubifs_info *c, union ubifs_key *key, int level, 1884 int lnum, int offs); 1885 int insert_old_idx_znode(struct ubifs_info *c, struct ubifs_znode *znode); 1886 int ubifs_tnc_get_bu_keys(struct ubifs_info *c, struct bu_info *bu); 1887 int ubifs_tnc_bulk_read(struct ubifs_info *c, struct bu_info *bu); 1888 1889 /* tnc_misc.c */ 1890 struct ubifs_znode *ubifs_tnc_levelorder_next(const struct ubifs_info *c, 1891 struct ubifs_znode *zr, 1892 struct ubifs_znode *znode); 1893 int ubifs_search_zbranch(const struct ubifs_info *c, 1894 const struct ubifs_znode *znode, 1895 const union ubifs_key *key, int *n); 1896 struct ubifs_znode *ubifs_tnc_postorder_first(struct ubifs_znode *znode); 1897 struct ubifs_znode *ubifs_tnc_postorder_next(const struct ubifs_info *c, 1898 struct ubifs_znode *znode); 1899 long ubifs_destroy_tnc_subtree(const struct ubifs_info *c, 1900 struct ubifs_znode *zr); 1901 struct ubifs_znode *ubifs_load_znode(struct ubifs_info *c, 1902 struct ubifs_zbranch *zbr, 1903 struct ubifs_znode *parent, int iip); 1904 int ubifs_tnc_read_node(struct ubifs_info *c, struct ubifs_zbranch *zbr, 1905 void *node); 1906 1907 /* tnc_commit.c */ 1908 int ubifs_tnc_start_commit(struct ubifs_info *c, struct ubifs_zbranch *zroot); 1909 int ubifs_tnc_end_commit(struct ubifs_info *c); 1910 1911 /* shrinker.c */ 1912 unsigned long ubifs_shrink_scan(struct shrinker *shrink, 1913 struct shrink_control *sc); 1914 unsigned long ubifs_shrink_count(struct shrinker *shrink, 1915 struct shrink_control *sc); 1916 1917 /* commit.c */ 1918 int ubifs_bg_thread(void *info); 1919 void ubifs_commit_required(struct ubifs_info *c); 1920 void ubifs_request_bg_commit(struct ubifs_info *c); 1921 int ubifs_run_commit(struct ubifs_info *c); 1922 void ubifs_recovery_commit(struct ubifs_info *c); 1923 int ubifs_gc_should_commit(struct ubifs_info *c); 1924 void ubifs_wait_for_commit(struct ubifs_info *c); 1925 1926 /* master.c */ 1927 int ubifs_compare_master_node(struct ubifs_info *c, void *m1, void *m2); 1928 int ubifs_read_master(struct ubifs_info *c); 1929 int ubifs_write_master(struct ubifs_info *c); 1930 1931 /* sb.c */ 1932 int ubifs_read_superblock(struct ubifs_info *c); 1933 int ubifs_write_sb_node(struct ubifs_info *c, struct ubifs_sb_node *sup); 1934 int ubifs_fixup_free_space(struct ubifs_info *c); 1935 int ubifs_enable_encryption(struct ubifs_info *c); 1936 1937 /* replay.c */ 1938 int ubifs_validate_entry(struct ubifs_info *c, 1939 const struct ubifs_dent_node *dent); 1940 int ubifs_replay_journal(struct ubifs_info *c); 1941 1942 /* gc.c */ 1943 int ubifs_garbage_collect(struct ubifs_info *c, int anyway); 1944 int ubifs_gc_start_commit(struct ubifs_info *c); 1945 int ubifs_gc_end_commit(struct ubifs_info *c); 1946 void ubifs_destroy_idx_gc(struct ubifs_info *c); 1947 int ubifs_get_idx_gc_leb(struct ubifs_info *c); 1948 int ubifs_garbage_collect_leb(struct ubifs_info *c, struct ubifs_lprops *lp); 1949 1950 /* orphan.c */ 1951 int ubifs_add_orphan(struct ubifs_info *c, ino_t inum); 1952 void ubifs_delete_orphan(struct ubifs_info *c, ino_t inum); 1953 int ubifs_orphan_start_commit(struct ubifs_info *c); 1954 int ubifs_orphan_end_commit(struct ubifs_info *c); 1955 int ubifs_mount_orphans(struct ubifs_info *c, int unclean, int read_only); 1956 int ubifs_clear_orphans(struct ubifs_info *c); 1957 1958 /* lpt.c */ 1959 int ubifs_calc_lpt_geom(struct ubifs_info *c); 1960 int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first, 1961 int *lpt_lebs, int *big_lpt, u8 *hash); 1962 int ubifs_lpt_init(struct ubifs_info *c, int rd, int wr); 1963 struct ubifs_lprops *ubifs_lpt_lookup(struct ubifs_info *c, int lnum); 1964 struct ubifs_lprops *ubifs_lpt_lookup_dirty(struct ubifs_info *c, int lnum); 1965 int ubifs_lpt_scan_nolock(struct ubifs_info *c, int start_lnum, int end_lnum, 1966 ubifs_lpt_scan_callback scan_cb, void *data); 1967 1968 /* Shared by lpt.c for lpt_commit.c */ 1969 void ubifs_pack_lsave(struct ubifs_info *c, void *buf, int *lsave); 1970 void ubifs_pack_ltab(struct ubifs_info *c, void *buf, 1971 struct ubifs_lpt_lprops *ltab); 1972 void ubifs_pack_pnode(struct ubifs_info *c, void *buf, 1973 struct ubifs_pnode *pnode); 1974 void ubifs_pack_nnode(struct ubifs_info *c, void *buf, 1975 struct ubifs_nnode *nnode); 1976 struct ubifs_pnode *ubifs_get_pnode(struct ubifs_info *c, 1977 struct ubifs_nnode *parent, int iip); 1978 struct ubifs_nnode *ubifs_get_nnode(struct ubifs_info *c, 1979 struct ubifs_nnode *parent, int iip); 1980 struct ubifs_pnode *ubifs_pnode_lookup(struct ubifs_info *c, int i); 1981 int ubifs_read_nnode(struct ubifs_info *c, struct ubifs_nnode *parent, int iip); 1982 void ubifs_add_lpt_dirt(struct ubifs_info *c, int lnum, int dirty); 1983 void ubifs_add_nnode_dirt(struct ubifs_info *c, struct ubifs_nnode *nnode); 1984 uint32_t ubifs_unpack_bits(const struct ubifs_info *c, uint8_t **addr, int *pos, int nrbits); 1985 struct ubifs_nnode *ubifs_first_nnode(struct ubifs_info *c, int *hght); 1986 /* Needed only in debugging code in lpt_commit.c */ 1987 int ubifs_unpack_nnode(const struct ubifs_info *c, void *buf, 1988 struct ubifs_nnode *nnode); 1989 int ubifs_lpt_calc_hash(struct ubifs_info *c, u8 *hash); 1990 1991 /* lpt_commit.c */ 1992 int ubifs_lpt_start_commit(struct ubifs_info *c); 1993 int ubifs_lpt_end_commit(struct ubifs_info *c); 1994 int ubifs_lpt_post_commit(struct ubifs_info *c); 1995 void ubifs_lpt_free(struct ubifs_info *c, int wr_only); 1996 1997 /* lprops.c */ 1998 const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c, 1999 const struct ubifs_lprops *lp, 2000 int free, int dirty, int flags, 2001 int idx_gc_cnt); 2002 void ubifs_get_lp_stats(struct ubifs_info *c, struct ubifs_lp_stats *lst); 2003 void ubifs_add_to_cat(struct ubifs_info *c, struct ubifs_lprops *lprops, 2004 int cat); 2005 void ubifs_replace_cat(struct ubifs_info *c, struct ubifs_lprops *old_lprops, 2006 struct ubifs_lprops *new_lprops); 2007 void ubifs_ensure_cat(struct ubifs_info *c, struct ubifs_lprops *lprops); 2008 int ubifs_categorize_lprops(const struct ubifs_info *c, 2009 const struct ubifs_lprops *lprops); 2010 int ubifs_change_one_lp(struct ubifs_info *c, int lnum, int free, int dirty, 2011 int flags_set, int flags_clean, int idx_gc_cnt); 2012 int ubifs_update_one_lp(struct ubifs_info *c, int lnum, int free, int dirty, 2013 int flags_set, int flags_clean); 2014 int ubifs_read_one_lp(struct ubifs_info *c, int lnum, struct ubifs_lprops *lp); 2015 const struct ubifs_lprops *ubifs_fast_find_free(struct ubifs_info *c); 2016 const struct ubifs_lprops *ubifs_fast_find_empty(struct ubifs_info *c); 2017 const struct ubifs_lprops *ubifs_fast_find_freeable(struct ubifs_info *c); 2018 const struct ubifs_lprops *ubifs_fast_find_frdi_idx(struct ubifs_info *c); 2019 int ubifs_calc_dark(const struct ubifs_info *c, int spc); 2020 2021 /* file.c */ 2022 int ubifs_fsync(struct file *file, loff_t start, loff_t end, int datasync); 2023 int ubifs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, 2024 struct iattr *attr); 2025 int ubifs_update_time(struct inode *inode, struct timespec64 *time, int flags); 2026 2027 /* dir.c */ 2028 struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir, 2029 umode_t mode); 2030 int ubifs_getattr(struct user_namespace *mnt_userns, const struct path *path, struct kstat *stat, 2031 u32 request_mask, unsigned int flags); 2032 int ubifs_check_dir_empty(struct inode *dir); 2033 2034 /* xattr.c */ 2035 int ubifs_xattr_set(struct inode *host, const char *name, const void *value, 2036 size_t size, int flags, bool check_lock); 2037 ssize_t ubifs_xattr_get(struct inode *host, const char *name, void *buf, 2038 size_t size); 2039 2040 #ifdef CONFIG_UBIFS_FS_XATTR 2041 extern const struct xattr_handler *ubifs_xattr_handlers[]; 2042 ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size); 2043 void ubifs_evict_xattr_inode(struct ubifs_info *c, ino_t xattr_inum); 2044 int ubifs_purge_xattrs(struct inode *host); 2045 #else 2046 #define ubifs_listxattr NULL 2047 #define ubifs_xattr_handlers NULL 2048 static inline void ubifs_evict_xattr_inode(struct ubifs_info *c, 2049 ino_t xattr_inum) { } 2050 static inline int ubifs_purge_xattrs(struct inode *host) 2051 { 2052 return 0; 2053 } 2054 #endif 2055 2056 #ifdef CONFIG_UBIFS_FS_SECURITY 2057 extern int ubifs_init_security(struct inode *dentry, struct inode *inode, 2058 const struct qstr *qstr); 2059 #else 2060 static inline int ubifs_init_security(struct inode *dentry, 2061 struct inode *inode, const struct qstr *qstr) 2062 { 2063 return 0; 2064 } 2065 #endif 2066 2067 2068 /* super.c */ 2069 struct inode *ubifs_iget(struct super_block *sb, unsigned long inum); 2070 2071 /* recovery.c */ 2072 int ubifs_recover_master_node(struct ubifs_info *c); 2073 int ubifs_write_rcvrd_mst_node(struct ubifs_info *c); 2074 struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum, 2075 int offs, void *sbuf, int jhead); 2076 struct ubifs_scan_leb *ubifs_recover_log_leb(struct ubifs_info *c, int lnum, 2077 int offs, void *sbuf); 2078 int ubifs_recover_inl_heads(struct ubifs_info *c, void *sbuf); 2079 int ubifs_clean_lebs(struct ubifs_info *c, void *sbuf); 2080 int ubifs_rcvry_gc_commit(struct ubifs_info *c); 2081 int ubifs_recover_size_accum(struct ubifs_info *c, union ubifs_key *key, 2082 int deletion, loff_t new_size); 2083 int ubifs_recover_size(struct ubifs_info *c, bool in_place); 2084 void ubifs_destroy_size_tree(struct ubifs_info *c); 2085 2086 /* ioctl.c */ 2087 int ubifs_fileattr_get(struct dentry *dentry, struct fileattr *fa); 2088 int ubifs_fileattr_set(struct user_namespace *mnt_userns, 2089 struct dentry *dentry, struct fileattr *fa); 2090 long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 2091 void ubifs_set_inode_flags(struct inode *inode); 2092 #ifdef CONFIG_COMPAT 2093 long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 2094 #endif 2095 2096 /* compressor.c */ 2097 int __init ubifs_compressors_init(void); 2098 void ubifs_compressors_exit(void); 2099 void ubifs_compress(const struct ubifs_info *c, const void *in_buf, int in_len, 2100 void *out_buf, int *out_len, int *compr_type); 2101 int ubifs_decompress(const struct ubifs_info *c, const void *buf, int len, 2102 void *out, int *out_len, int compr_type); 2103 2104 /* sysfs.c */ 2105 int ubifs_sysfs_init(void); 2106 void ubifs_sysfs_exit(void); 2107 int ubifs_sysfs_register(struct ubifs_info *c); 2108 void ubifs_sysfs_unregister(struct ubifs_info *c); 2109 2110 #include "debug.h" 2111 #include "misc.h" 2112 #include "key.h" 2113 2114 #ifndef CONFIG_FS_ENCRYPTION 2115 static inline int ubifs_encrypt(const struct inode *inode, 2116 struct ubifs_data_node *dn, 2117 unsigned int in_len, unsigned int *out_len, 2118 int block) 2119 { 2120 struct ubifs_info *c = inode->i_sb->s_fs_info; 2121 ubifs_assert(c, 0); 2122 return -EOPNOTSUPP; 2123 } 2124 static inline int ubifs_decrypt(const struct inode *inode, 2125 struct ubifs_data_node *dn, 2126 unsigned int *out_len, int block) 2127 { 2128 struct ubifs_info *c = inode->i_sb->s_fs_info; 2129 ubifs_assert(c, 0); 2130 return -EOPNOTSUPP; 2131 } 2132 #else 2133 /* crypto.c */ 2134 int ubifs_encrypt(const struct inode *inode, struct ubifs_data_node *dn, 2135 unsigned int in_len, unsigned int *out_len, int block); 2136 int ubifs_decrypt(const struct inode *inode, struct ubifs_data_node *dn, 2137 unsigned int *out_len, int block); 2138 #endif 2139 2140 extern const struct fscrypt_operations ubifs_crypt_operations; 2141 2142 /* Normal UBIFS messages */ 2143 __printf(2, 3) 2144 void ubifs_msg(const struct ubifs_info *c, const char *fmt, ...); 2145 __printf(2, 3) 2146 void ubifs_err(const struct ubifs_info *c, const char *fmt, ...); 2147 __printf(2, 3) 2148 void ubifs_warn(const struct ubifs_info *c, const char *fmt, ...); 2149 /* 2150 * A conditional variant of 'ubifs_err()' which doesn't output anything 2151 * if probing (ie. SB_SILENT set). 2152 */ 2153 #define ubifs_errc(c, fmt, ...) \ 2154 do { \ 2155 if (!(c)->probing) \ 2156 ubifs_err(c, fmt, ##__VA_ARGS__); \ 2157 } while (0) 2158 2159 #endif /* !__UBIFS_H__ */ 2160