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 <linux/security.h> 40 #include <linux/xattr.h> 41 #include "ubifs-media.h" 42 43 /* Version of this UBIFS implementation */ 44 #define UBIFS_VERSION 1 45 46 /* UBIFS file system VFS magic number */ 47 #define UBIFS_SUPER_MAGIC 0x24051905 48 49 /* Number of UBIFS blocks per VFS page */ 50 #define UBIFS_BLOCKS_PER_PAGE (PAGE_SIZE / UBIFS_BLOCK_SIZE) 51 #define UBIFS_BLOCKS_PER_PAGE_SHIFT (PAGE_SHIFT - UBIFS_BLOCK_SHIFT) 52 53 /* "File system end of life" sequence number watermark */ 54 #define SQNUM_WARN_WATERMARK 0xFFFFFFFF00000000ULL 55 #define SQNUM_WATERMARK 0xFFFFFFFFFF000000ULL 56 57 /* 58 * Minimum amount of LEBs reserved for the index. At present the index needs at 59 * least 2 LEBs: one for the index head and one for in-the-gaps method (which 60 * currently does not cater for the index head and so excludes it from 61 * consideration). 62 */ 63 #define MIN_INDEX_LEBS 2 64 65 /* Minimum amount of data UBIFS writes to the flash */ 66 #define MIN_WRITE_SZ (UBIFS_DATA_NODE_SZ + 8) 67 68 /* 69 * Currently we do not support inode number overlapping and re-using, so this 70 * watermark defines dangerous inode number level. This should be fixed later, 71 * although it is difficult to exceed current limit. Another option is to use 72 * 64-bit inode numbers, but this means more overhead. 73 */ 74 #define INUM_WARN_WATERMARK 0xFFF00000 75 #define INUM_WATERMARK 0xFFFFFF00 76 77 /* Maximum number of entries in each LPT (LEB category) heap */ 78 #define LPT_HEAP_SZ 256 79 80 /* 81 * Background thread name pattern. The numbers are UBI device and volume 82 * numbers. 83 */ 84 #define BGT_NAME_PATTERN "ubifs_bgt%d_%d" 85 86 /* Write-buffer synchronization timeout interval in seconds */ 87 #define WBUF_TIMEOUT_SOFTLIMIT 3 88 #define WBUF_TIMEOUT_HARDLIMIT 5 89 90 /* Maximum possible inode number (only 32-bit inodes are supported now) */ 91 #define MAX_INUM 0xFFFFFFFF 92 93 /* Number of non-data journal heads */ 94 #define NONDATA_JHEADS_CNT 2 95 96 /* Shorter names for journal head numbers for internal usage */ 97 #define GCHD UBIFS_GC_HEAD 98 #define BASEHD UBIFS_BASE_HEAD 99 #define DATAHD UBIFS_DATA_HEAD 100 101 /* 'No change' value for 'ubifs_change_lp()' */ 102 #define LPROPS_NC 0x80000001 103 104 /* 105 * There is no notion of truncation key because truncation nodes do not exist 106 * in TNC. However, when replaying, it is handy to introduce fake "truncation" 107 * keys for truncation nodes because the code becomes simpler. So we define 108 * %UBIFS_TRUN_KEY type. 109 * 110 * But otherwise, out of the journal reply scope, the truncation keys are 111 * invalid. 112 */ 113 #define UBIFS_TRUN_KEY UBIFS_KEY_TYPES_CNT 114 #define UBIFS_INVALID_KEY UBIFS_KEY_TYPES_CNT 115 116 /* 117 * How much a directory entry/extended attribute entry adds to the parent/host 118 * inode. 119 */ 120 #define CALC_DENT_SIZE(name_len) ALIGN(UBIFS_DENT_NODE_SZ + (name_len) + 1, 8) 121 122 /* How much an extended attribute adds to the host inode */ 123 #define CALC_XATTR_BYTES(data_len) ALIGN(UBIFS_INO_NODE_SZ + (data_len) + 1, 8) 124 125 /* 126 * Znodes which were not touched for 'OLD_ZNODE_AGE' seconds are considered 127 * "old", and znode which were touched last 'YOUNG_ZNODE_AGE' seconds ago are 128 * considered "young". This is used by shrinker when selecting znode to trim 129 * off. 130 */ 131 #define OLD_ZNODE_AGE 20 132 #define YOUNG_ZNODE_AGE 5 133 134 /* 135 * Some compressors, like LZO, may end up with more data then the input buffer. 136 * So UBIFS always allocates larger output buffer, to be sure the compressor 137 * will not corrupt memory in case of worst case compression. 138 */ 139 #define WORST_COMPR_FACTOR 2 140 141 /* 142 * How much memory is needed for a buffer where we compress a data node. 143 */ 144 #define COMPRESSED_DATA_NODE_BUF_SZ \ 145 (UBIFS_DATA_NODE_SZ + UBIFS_BLOCK_SIZE * WORST_COMPR_FACTOR) 146 147 /* Maximum expected tree height for use by bottom_up_buf */ 148 #define BOTTOM_UP_HEIGHT 64 149 150 /* Maximum number of data nodes to bulk-read */ 151 #define UBIFS_MAX_BULK_READ 32 152 153 /* 154 * Lockdep classes for UBIFS inode @ui_mutex. 155 */ 156 enum { 157 WB_MUTEX_1 = 0, 158 WB_MUTEX_2 = 1, 159 WB_MUTEX_3 = 2, 160 }; 161 162 /* 163 * Znode flags (actually, bit numbers which store the flags). 164 * 165 * DIRTY_ZNODE: znode is dirty 166 * COW_ZNODE: znode is being committed and a new instance of this znode has to 167 * be created before changing this znode 168 * OBSOLETE_ZNODE: znode is obsolete, which means it was deleted, but it is 169 * still in the commit list and the ongoing commit operation 170 * will commit it, and delete this znode after it is done 171 */ 172 enum { 173 DIRTY_ZNODE = 0, 174 COW_ZNODE = 1, 175 OBSOLETE_ZNODE = 2, 176 }; 177 178 /* 179 * Commit states. 180 * 181 * COMMIT_RESTING: commit is not wanted 182 * COMMIT_BACKGROUND: background commit has been requested 183 * COMMIT_REQUIRED: commit is required 184 * COMMIT_RUNNING_BACKGROUND: background commit is running 185 * COMMIT_RUNNING_REQUIRED: commit is running and it is required 186 * COMMIT_BROKEN: commit failed 187 */ 188 enum { 189 COMMIT_RESTING = 0, 190 COMMIT_BACKGROUND, 191 COMMIT_REQUIRED, 192 COMMIT_RUNNING_BACKGROUND, 193 COMMIT_RUNNING_REQUIRED, 194 COMMIT_BROKEN, 195 }; 196 197 /* 198 * 'ubifs_scan_a_node()' return values. 199 * 200 * SCANNED_GARBAGE: scanned garbage 201 * SCANNED_EMPTY_SPACE: scanned empty space 202 * SCANNED_A_NODE: scanned a valid node 203 * SCANNED_A_CORRUPT_NODE: scanned a corrupted node 204 * SCANNED_A_BAD_PAD_NODE: scanned a padding node with invalid pad length 205 * 206 * Greater than zero means: 'scanned that number of padding bytes' 207 */ 208 enum { 209 SCANNED_GARBAGE = 0, 210 SCANNED_EMPTY_SPACE = -1, 211 SCANNED_A_NODE = -2, 212 SCANNED_A_CORRUPT_NODE = -3, 213 SCANNED_A_BAD_PAD_NODE = -4, 214 }; 215 216 /* 217 * LPT cnode flag bits. 218 * 219 * DIRTY_CNODE: cnode is dirty 220 * OBSOLETE_CNODE: cnode is being committed and has been copied (or deleted), 221 * so it can (and must) be freed when the commit is finished 222 * COW_CNODE: cnode is being committed and must be copied before writing 223 */ 224 enum { 225 DIRTY_CNODE = 0, 226 OBSOLETE_CNODE = 1, 227 COW_CNODE = 2, 228 }; 229 230 /* 231 * Dirty flag bits (lpt_drty_flgs) for LPT special nodes. 232 * 233 * LTAB_DIRTY: ltab node is dirty 234 * LSAVE_DIRTY: lsave node is dirty 235 */ 236 enum { 237 LTAB_DIRTY = 1, 238 LSAVE_DIRTY = 2, 239 }; 240 241 /* 242 * Return codes used by the garbage collector. 243 * @LEB_FREED: the logical eraseblock was freed and is ready to use 244 * @LEB_FREED_IDX: indexing LEB was freed and can be used only after the commit 245 * @LEB_RETAINED: the logical eraseblock was freed and retained for GC purposes 246 */ 247 enum { 248 LEB_FREED, 249 LEB_FREED_IDX, 250 LEB_RETAINED, 251 }; 252 253 /** 254 * struct ubifs_old_idx - index node obsoleted since last commit start. 255 * @rb: rb-tree node 256 * @lnum: LEB number of obsoleted index node 257 * @offs: offset of obsoleted index node 258 */ 259 struct ubifs_old_idx { 260 struct rb_node rb; 261 int lnum; 262 int offs; 263 }; 264 265 /* The below union makes it easier to deal with keys */ 266 union ubifs_key { 267 uint8_t u8[UBIFS_SK_LEN]; 268 uint32_t u32[UBIFS_SK_LEN/4]; 269 uint64_t u64[UBIFS_SK_LEN/8]; 270 __le32 j32[UBIFS_SK_LEN/4]; 271 }; 272 273 /** 274 * struct ubifs_scan_node - UBIFS scanned node information. 275 * @list: list of scanned nodes 276 * @key: key of node scanned (if it has one) 277 * @sqnum: sequence number 278 * @type: type of node scanned 279 * @offs: offset with LEB of node scanned 280 * @len: length of node scanned 281 * @node: raw node 282 */ 283 struct ubifs_scan_node { 284 struct list_head list; 285 union ubifs_key key; 286 unsigned long long sqnum; 287 int type; 288 int offs; 289 int len; 290 void *node; 291 }; 292 293 /** 294 * struct ubifs_scan_leb - UBIFS scanned LEB information. 295 * @lnum: logical eraseblock number 296 * @nodes_cnt: number of nodes scanned 297 * @nodes: list of struct ubifs_scan_node 298 * @endpt: end point (and therefore the start of empty space) 299 * @buf: buffer containing entire LEB scanned 300 */ 301 struct ubifs_scan_leb { 302 int lnum; 303 int nodes_cnt; 304 struct list_head nodes; 305 int endpt; 306 void *buf; 307 }; 308 309 /** 310 * struct ubifs_gced_idx_leb - garbage-collected indexing LEB. 311 * @list: list 312 * @lnum: LEB number 313 * @unmap: OK to unmap this LEB 314 * 315 * This data structure is used to temporary store garbage-collected indexing 316 * LEBs - they are not released immediately, but only after the next commit. 317 * This is needed to guarantee recoverability. 318 */ 319 struct ubifs_gced_idx_leb { 320 struct list_head list; 321 int lnum; 322 int unmap; 323 }; 324 325 /** 326 * struct ubifs_inode - UBIFS in-memory inode description. 327 * @vfs_inode: VFS inode description object 328 * @creat_sqnum: sequence number at time of creation 329 * @del_cmtno: commit number corresponding to the time the inode was deleted, 330 * protected by @c->commit_sem; 331 * @xattr_size: summarized size of all extended attributes in bytes 332 * @xattr_cnt: count of extended attributes this inode has 333 * @xattr_names: sum of lengths of all extended attribute names belonging to 334 * this inode 335 * @dirty: non-zero if the inode is dirty 336 * @xattr: non-zero if this is an extended attribute inode 337 * @bulk_read: non-zero if bulk-read should be used 338 * @ui_mutex: serializes inode write-back with the rest of VFS operations, 339 * serializes "clean <-> dirty" state changes, serializes bulk-read, 340 * protects @dirty, @bulk_read, @ui_size, and @xattr_size 341 * @ui_lock: protects @synced_i_size 342 * @synced_i_size: synchronized size of inode, i.e. the value of inode size 343 * currently stored on the flash; used only for regular file 344 * inodes 345 * @ui_size: inode size used by UBIFS when writing to flash 346 * @flags: inode flags (@UBIFS_COMPR_FL, etc) 347 * @compr_type: default compression type used for this inode 348 * @last_page_read: page number of last page read (for bulk read) 349 * @read_in_a_row: number of consecutive pages read in a row (for bulk read) 350 * @data_len: length of the data attached to the inode 351 * @data: inode's data 352 * 353 * @ui_mutex exists for two main reasons. At first it prevents inodes from 354 * being written back while UBIFS changing them, being in the middle of an VFS 355 * operation. This way UBIFS makes sure the inode fields are consistent. For 356 * example, in 'ubifs_rename()' we change 3 inodes simultaneously, and 357 * write-back must not write any of them before we have finished. 358 * 359 * The second reason is budgeting - UBIFS has to budget all operations. If an 360 * operation is going to mark an inode dirty, it has to allocate budget for 361 * this. It cannot just mark it dirty because there is no guarantee there will 362 * be enough flash space to write the inode back later. This means UBIFS has 363 * to have full control over inode "clean <-> dirty" transitions (and pages 364 * actually). But unfortunately, VFS marks inodes dirty in many places, and it 365 * does not ask the file-system if it is allowed to do so (there is a notifier, 366 * but it is not enough), i.e., there is no mechanism to synchronize with this. 367 * So UBIFS has its own inode dirty flag and its own mutex to serialize 368 * "clean <-> dirty" transitions. 369 * 370 * The @synced_i_size field is used to make sure we never write pages which are 371 * beyond last synchronized inode size. See 'ubifs_writepage()' for more 372 * information. 373 * 374 * The @ui_size is a "shadow" variable for @inode->i_size and UBIFS uses 375 * @ui_size instead of @inode->i_size. The reason for this is that UBIFS cannot 376 * make sure @inode->i_size is always changed under @ui_mutex, because it 377 * cannot call 'truncate_setsize()' with @ui_mutex locked, because it would 378 * deadlock with 'ubifs_writepage()' (see file.c). All the other inode fields 379 * are changed under @ui_mutex, so they do not need "shadow" fields. Note, one 380 * could consider to rework locking and base it on "shadow" fields. 381 */ 382 struct ubifs_inode { 383 struct inode vfs_inode; 384 unsigned long long creat_sqnum; 385 unsigned long long del_cmtno; 386 unsigned int xattr_size; 387 unsigned int xattr_cnt; 388 unsigned int xattr_names; 389 unsigned int dirty:1; 390 unsigned int xattr:1; 391 unsigned int bulk_read:1; 392 unsigned int compr_type:2; 393 struct mutex ui_mutex; 394 spinlock_t ui_lock; 395 loff_t synced_i_size; 396 loff_t ui_size; 397 int flags; 398 pgoff_t last_page_read; 399 pgoff_t read_in_a_row; 400 int data_len; 401 void *data; 402 }; 403 404 /** 405 * struct ubifs_unclean_leb - records a LEB recovered under read-only mode. 406 * @list: list 407 * @lnum: LEB number of recovered LEB 408 * @endpt: offset where recovery ended 409 * 410 * This structure records a LEB identified during recovery that needs to be 411 * cleaned but was not because UBIFS was mounted read-only. The information 412 * is used to clean the LEB when remounting to read-write mode. 413 */ 414 struct ubifs_unclean_leb { 415 struct list_head list; 416 int lnum; 417 int endpt; 418 }; 419 420 /* 421 * LEB properties flags. 422 * 423 * LPROPS_UNCAT: not categorized 424 * LPROPS_DIRTY: dirty > free, dirty >= @c->dead_wm, not index 425 * LPROPS_DIRTY_IDX: dirty + free > @c->min_idx_node_sze and index 426 * LPROPS_FREE: free > 0, dirty < @c->dead_wm, not empty, not index 427 * LPROPS_HEAP_CNT: number of heaps used for storing categorized LEBs 428 * LPROPS_EMPTY: LEB is empty, not taken 429 * LPROPS_FREEABLE: free + dirty == leb_size, not index, not taken 430 * LPROPS_FRDI_IDX: free + dirty == leb_size and index, may be taken 431 * LPROPS_CAT_MASK: mask for the LEB categories above 432 * LPROPS_TAKEN: LEB was taken (this flag is not saved on the media) 433 * LPROPS_INDEX: LEB contains indexing nodes (this flag also exists on flash) 434 */ 435 enum { 436 LPROPS_UNCAT = 0, 437 LPROPS_DIRTY = 1, 438 LPROPS_DIRTY_IDX = 2, 439 LPROPS_FREE = 3, 440 LPROPS_HEAP_CNT = 3, 441 LPROPS_EMPTY = 4, 442 LPROPS_FREEABLE = 5, 443 LPROPS_FRDI_IDX = 6, 444 LPROPS_CAT_MASK = 15, 445 LPROPS_TAKEN = 16, 446 LPROPS_INDEX = 32, 447 }; 448 449 /** 450 * struct ubifs_lprops - logical eraseblock properties. 451 * @free: amount of free space in bytes 452 * @dirty: amount of dirty space in bytes 453 * @flags: LEB properties flags (see above) 454 * @lnum: LEB number 455 * @list: list of same-category lprops (for LPROPS_EMPTY and LPROPS_FREEABLE) 456 * @hpos: heap position in heap of same-category lprops (other categories) 457 */ 458 struct ubifs_lprops { 459 int free; 460 int dirty; 461 int flags; 462 int lnum; 463 union { 464 struct list_head list; 465 int hpos; 466 }; 467 }; 468 469 /** 470 * struct ubifs_lpt_lprops - LPT logical eraseblock properties. 471 * @free: amount of free space in bytes 472 * @dirty: amount of dirty space in bytes 473 * @tgc: trivial GC flag (1 => unmap after commit end) 474 * @cmt: commit flag (1 => reserved for commit) 475 */ 476 struct ubifs_lpt_lprops { 477 int free; 478 int dirty; 479 unsigned tgc:1; 480 unsigned cmt:1; 481 }; 482 483 /** 484 * struct ubifs_lp_stats - statistics of eraseblocks in the main area. 485 * @empty_lebs: number of empty LEBs 486 * @taken_empty_lebs: number of taken LEBs 487 * @idx_lebs: number of indexing LEBs 488 * @total_free: total free space in bytes (includes all LEBs) 489 * @total_dirty: total dirty space in bytes (includes all LEBs) 490 * @total_used: total used space in bytes (does not include index LEBs) 491 * @total_dead: total dead space in bytes (does not include index LEBs) 492 * @total_dark: total dark space in bytes (does not include index LEBs) 493 * 494 * The @taken_empty_lebs field counts the LEBs that are in the transient state 495 * of having been "taken" for use but not yet written to. @taken_empty_lebs is 496 * needed to account correctly for @gc_lnum, otherwise @empty_lebs could be 497 * used by itself (in which case 'unused_lebs' would be a better name). In the 498 * case of @gc_lnum, it is "taken" at mount time or whenever a LEB is retained 499 * by GC, but unlike other empty LEBs that are "taken", it may not be written 500 * straight away (i.e. before the next commit start or unmount), so either 501 * @gc_lnum must be specially accounted for, or the current approach followed 502 * i.e. count it under @taken_empty_lebs. 503 * 504 * @empty_lebs includes @taken_empty_lebs. 505 * 506 * @total_used, @total_dead and @total_dark fields do not account indexing 507 * LEBs. 508 */ 509 struct ubifs_lp_stats { 510 int empty_lebs; 511 int taken_empty_lebs; 512 int idx_lebs; 513 long long total_free; 514 long long total_dirty; 515 long long total_used; 516 long long total_dead; 517 long long total_dark; 518 }; 519 520 struct ubifs_nnode; 521 522 /** 523 * struct ubifs_cnode - LEB Properties Tree common node. 524 * @parent: parent nnode 525 * @cnext: next cnode to commit 526 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE) 527 * @iip: index in parent 528 * @level: level in the tree (zero for pnodes, greater than zero for nnodes) 529 * @num: node number 530 */ 531 struct ubifs_cnode { 532 struct ubifs_nnode *parent; 533 struct ubifs_cnode *cnext; 534 unsigned long flags; 535 int iip; 536 int level; 537 int num; 538 }; 539 540 /** 541 * struct ubifs_pnode - LEB Properties Tree leaf node. 542 * @parent: parent nnode 543 * @cnext: next cnode to commit 544 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE) 545 * @iip: index in parent 546 * @level: level in the tree (always zero for pnodes) 547 * @num: node number 548 * @lprops: LEB properties array 549 */ 550 struct ubifs_pnode { 551 struct ubifs_nnode *parent; 552 struct ubifs_cnode *cnext; 553 unsigned long flags; 554 int iip; 555 int level; 556 int num; 557 struct ubifs_lprops lprops[UBIFS_LPT_FANOUT]; 558 }; 559 560 /** 561 * struct ubifs_nbranch - LEB Properties Tree internal node branch. 562 * @lnum: LEB number of child 563 * @offs: offset of child 564 * @nnode: nnode child 565 * @pnode: pnode child 566 * @cnode: cnode child 567 */ 568 struct ubifs_nbranch { 569 int lnum; 570 int offs; 571 union { 572 struct ubifs_nnode *nnode; 573 struct ubifs_pnode *pnode; 574 struct ubifs_cnode *cnode; 575 }; 576 }; 577 578 /** 579 * struct ubifs_nnode - LEB Properties Tree internal node. 580 * @parent: parent nnode 581 * @cnext: next cnode to commit 582 * @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE) 583 * @iip: index in parent 584 * @level: level in the tree (always greater than zero for nnodes) 585 * @num: node number 586 * @nbranch: branches to child nodes 587 */ 588 struct ubifs_nnode { 589 struct ubifs_nnode *parent; 590 struct ubifs_cnode *cnext; 591 unsigned long flags; 592 int iip; 593 int level; 594 int num; 595 struct ubifs_nbranch nbranch[UBIFS_LPT_FANOUT]; 596 }; 597 598 /** 599 * struct ubifs_lpt_heap - heap of categorized lprops. 600 * @arr: heap array 601 * @cnt: number in heap 602 * @max_cnt: maximum number allowed in heap 603 * 604 * There are %LPROPS_HEAP_CNT heaps. 605 */ 606 struct ubifs_lpt_heap { 607 struct ubifs_lprops **arr; 608 int cnt; 609 int max_cnt; 610 }; 611 612 /* 613 * Return codes for LPT scan callback function. 614 * 615 * LPT_SCAN_CONTINUE: continue scanning 616 * LPT_SCAN_ADD: add the LEB properties scanned to the tree in memory 617 * LPT_SCAN_STOP: stop scanning 618 */ 619 enum { 620 LPT_SCAN_CONTINUE = 0, 621 LPT_SCAN_ADD = 1, 622 LPT_SCAN_STOP = 2, 623 }; 624 625 struct ubifs_info; 626 627 /* Callback used by the 'ubifs_lpt_scan_nolock()' function */ 628 typedef int (*ubifs_lpt_scan_callback)(struct ubifs_info *c, 629 const struct ubifs_lprops *lprops, 630 int in_tree, void *data); 631 632 /** 633 * struct ubifs_wbuf - UBIFS write-buffer. 634 * @c: UBIFS file-system description object 635 * @buf: write-buffer (of min. flash I/O unit size) 636 * @lnum: logical eraseblock number the write-buffer points to 637 * @offs: write-buffer offset in this logical eraseblock 638 * @avail: number of bytes available in the write-buffer 639 * @used: number of used bytes in the write-buffer 640 * @size: write-buffer size (in [@c->min_io_size, @c->max_write_size] range) 641 * @jhead: journal head the mutex belongs to (note, needed only to shut lockdep 642 * up by 'mutex_lock_nested()). 643 * @sync_callback: write-buffer synchronization callback 644 * @io_mutex: serializes write-buffer I/O 645 * @lock: serializes @buf, @lnum, @offs, @avail, @used, @next_ino and @inodes 646 * fields 647 * @softlimit: soft write-buffer timeout interval 648 * @delta: hard and soft timeouts delta (the timer expire interval is @softlimit 649 * and @softlimit + @delta) 650 * @timer: write-buffer timer 651 * @no_timer: non-zero if this write-buffer does not have a timer 652 * @need_sync: non-zero if the timer expired and the wbuf needs sync'ing 653 * @next_ino: points to the next position of the following inode number 654 * @inodes: stores the inode numbers of the nodes which are in wbuf 655 * 656 * The write-buffer synchronization callback is called when the write-buffer is 657 * synchronized in order to notify how much space was wasted due to 658 * write-buffer padding and how much free space is left in the LEB. 659 * 660 * Note: the fields @buf, @lnum, @offs, @avail and @used can be read under 661 * spin-lock or mutex because they are written under both mutex and spin-lock. 662 * @buf is appended to under mutex but overwritten under both mutex and 663 * spin-lock. Thus the data between @buf and @buf + @used can be read under 664 * spinlock. 665 */ 666 struct ubifs_wbuf { 667 struct ubifs_info *c; 668 void *buf; 669 int lnum; 670 int offs; 671 int avail; 672 int used; 673 int size; 674 int jhead; 675 int (*sync_callback)(struct ubifs_info *c, int lnum, int free, int pad); 676 struct mutex io_mutex; 677 spinlock_t lock; 678 ktime_t softlimit; 679 unsigned long long delta; 680 struct hrtimer timer; 681 unsigned int no_timer:1; 682 unsigned int need_sync:1; 683 int next_ino; 684 ino_t *inodes; 685 }; 686 687 /** 688 * struct ubifs_bud - bud logical eraseblock. 689 * @lnum: logical eraseblock number 690 * @start: where the (uncommitted) bud data starts 691 * @jhead: journal head number this bud belongs to 692 * @list: link in the list buds belonging to the same journal head 693 * @rb: link in the tree of all buds 694 */ 695 struct ubifs_bud { 696 int lnum; 697 int start; 698 int jhead; 699 struct list_head list; 700 struct rb_node rb; 701 }; 702 703 /** 704 * struct ubifs_jhead - journal head. 705 * @wbuf: head's write-buffer 706 * @buds_list: list of bud LEBs belonging to this journal head 707 * @grouped: non-zero if UBIFS groups nodes when writing to this journal head 708 * 709 * Note, the @buds list is protected by the @c->buds_lock. 710 */ 711 struct ubifs_jhead { 712 struct ubifs_wbuf wbuf; 713 struct list_head buds_list; 714 unsigned int grouped:1; 715 }; 716 717 /** 718 * struct ubifs_zbranch - key/coordinate/length branch stored in znodes. 719 * @key: key 720 * @znode: znode address in memory 721 * @lnum: LEB number of the target node (indexing node or data node) 722 * @offs: target node offset within @lnum 723 * @len: target node length 724 */ 725 struct ubifs_zbranch { 726 union ubifs_key key; 727 union { 728 struct ubifs_znode *znode; 729 void *leaf; 730 }; 731 int lnum; 732 int offs; 733 int len; 734 }; 735 736 /** 737 * struct ubifs_znode - in-memory representation of an indexing node. 738 * @parent: parent znode or NULL if it is the root 739 * @cnext: next znode to commit 740 * @flags: znode flags (%DIRTY_ZNODE, %COW_ZNODE or %OBSOLETE_ZNODE) 741 * @time: last access time (seconds) 742 * @level: level of the entry in the TNC tree 743 * @child_cnt: count of child znodes 744 * @iip: index in parent's zbranch array 745 * @alt: lower bound of key range has altered i.e. child inserted at slot 0 746 * @lnum: LEB number of the corresponding indexing node 747 * @offs: offset of the corresponding indexing node 748 * @len: length of the corresponding indexing node 749 * @zbranch: array of znode branches (@c->fanout elements) 750 * 751 * Note! The @lnum, @offs, and @len fields are not really needed - we have them 752 * only for internal consistency check. They could be removed to save some RAM. 753 */ 754 struct ubifs_znode { 755 struct ubifs_znode *parent; 756 struct ubifs_znode *cnext; 757 unsigned long flags; 758 unsigned long time; 759 int level; 760 int child_cnt; 761 int iip; 762 int alt; 763 int lnum; 764 int offs; 765 int len; 766 struct ubifs_zbranch zbranch[]; 767 }; 768 769 /** 770 * struct bu_info - bulk-read information. 771 * @key: first data node key 772 * @zbranch: zbranches of data nodes to bulk read 773 * @buf: buffer to read into 774 * @buf_len: buffer length 775 * @gc_seq: GC sequence number to detect races with GC 776 * @cnt: number of data nodes for bulk read 777 * @blk_cnt: number of data blocks including holes 778 * @oef: end of file reached 779 */ 780 struct bu_info { 781 union ubifs_key key; 782 struct ubifs_zbranch zbranch[UBIFS_MAX_BULK_READ]; 783 void *buf; 784 int buf_len; 785 int gc_seq; 786 int cnt; 787 int blk_cnt; 788 int eof; 789 }; 790 791 /** 792 * struct ubifs_node_range - node length range description data structure. 793 * @len: fixed node length 794 * @min_len: minimum possible node length 795 * @max_len: maximum possible node length 796 * 797 * If @max_len is %0, the node has fixed length @len. 798 */ 799 struct ubifs_node_range { 800 union { 801 int len; 802 int min_len; 803 }; 804 int max_len; 805 }; 806 807 /** 808 * struct ubifs_compressor - UBIFS compressor description structure. 809 * @compr_type: compressor type (%UBIFS_COMPR_LZO, etc) 810 * @cc: cryptoapi compressor handle 811 * @comp_mutex: mutex used during compression 812 * @decomp_mutex: mutex used during decompression 813 * @name: compressor name 814 * @capi_name: cryptoapi compressor name 815 */ 816 struct ubifs_compressor { 817 int compr_type; 818 struct crypto_comp *cc; 819 struct mutex *comp_mutex; 820 struct mutex *decomp_mutex; 821 const char *name; 822 const char *capi_name; 823 }; 824 825 /** 826 * struct ubifs_budget_req - budget requirements of an operation. 827 * 828 * @fast: non-zero if the budgeting should try to acquire budget quickly and 829 * should not try to call write-back 830 * @recalculate: non-zero if @idx_growth, @data_growth, and @dd_growth fields 831 * have to be re-calculated 832 * @new_page: non-zero if the operation adds a new page 833 * @dirtied_page: non-zero if the operation makes a page dirty 834 * @new_dent: non-zero if the operation adds a new directory entry 835 * @mod_dent: non-zero if the operation removes or modifies an existing 836 * directory entry 837 * @new_ino: non-zero if the operation adds a new inode 838 * @new_ino_d: how much data newly created inode contains 839 * @dirtied_ino: how many inodes the operation makes dirty 840 * @dirtied_ino_d: how much data dirtied inode contains 841 * @idx_growth: how much the index will supposedly grow 842 * @data_growth: how much new data the operation will supposedly add 843 * @dd_growth: how much data that makes other data dirty the operation will 844 * supposedly add 845 * 846 * @idx_growth, @data_growth and @dd_growth are not used in budget request. The 847 * budgeting subsystem caches index and data growth values there to avoid 848 * re-calculating them when the budget is released. However, if @idx_growth is 849 * %-1, it is calculated by the release function using other fields. 850 * 851 * An inode may contain 4KiB of data at max., thus the widths of @new_ino_d 852 * is 13 bits, and @dirtied_ino_d - 15, because up to 4 inodes may be made 853 * dirty by the re-name operation. 854 * 855 * Note, UBIFS aligns node lengths to 8-bytes boundary, so the requester has to 856 * make sure the amount of inode data which contribute to @new_ino_d and 857 * @dirtied_ino_d fields are aligned. 858 */ 859 struct ubifs_budget_req { 860 unsigned int fast:1; 861 unsigned int recalculate:1; 862 #ifndef UBIFS_DEBUG 863 unsigned int new_page:1; 864 unsigned int dirtied_page:1; 865 unsigned int new_dent:1; 866 unsigned int mod_dent:1; 867 unsigned int new_ino:1; 868 unsigned int new_ino_d:13; 869 unsigned int dirtied_ino:4; 870 unsigned int dirtied_ino_d:15; 871 #else 872 /* Not bit-fields to check for overflows */ 873 unsigned int new_page; 874 unsigned int dirtied_page; 875 unsigned int new_dent; 876 unsigned int mod_dent; 877 unsigned int new_ino; 878 unsigned int new_ino_d; 879 unsigned int dirtied_ino; 880 unsigned int dirtied_ino_d; 881 #endif 882 int idx_growth; 883 int data_growth; 884 int dd_growth; 885 }; 886 887 /** 888 * struct ubifs_orphan - stores the inode number of an orphan. 889 * @rb: rb-tree node of rb-tree of orphans sorted by inode number 890 * @list: list head of list of orphans in order added 891 * @new_list: list head of list of orphans added since the last commit 892 * @cnext: next orphan to commit 893 * @dnext: next orphan to delete 894 * @inum: inode number 895 * @new: %1 => added since the last commit, otherwise %0 896 * @cmt: %1 => commit pending, otherwise %0 897 * @del: %1 => delete pending, otherwise %0 898 */ 899 struct ubifs_orphan { 900 struct rb_node rb; 901 struct list_head list; 902 struct list_head new_list; 903 struct ubifs_orphan *cnext; 904 struct ubifs_orphan *dnext; 905 ino_t inum; 906 unsigned new:1; 907 unsigned cmt:1; 908 unsigned del:1; 909 }; 910 911 /** 912 * struct ubifs_mount_opts - UBIFS-specific mount options information. 913 * @unmount_mode: selected unmount mode (%0 default, %1 normal, %2 fast) 914 * @bulk_read: enable/disable bulk-reads (%0 default, %1 disable, %2 enable) 915 * @chk_data_crc: enable/disable CRC data checking when reading data nodes 916 * (%0 default, %1 disable, %2 enable) 917 * @override_compr: override default compressor (%0 - do not override and use 918 * superblock compressor, %1 - override and use compressor 919 * specified in @compr_type) 920 * @compr_type: compressor type to override the superblock compressor with 921 * (%UBIFS_COMPR_NONE, etc) 922 */ 923 struct ubifs_mount_opts { 924 unsigned int unmount_mode:2; 925 unsigned int bulk_read:2; 926 unsigned int chk_data_crc:2; 927 unsigned int override_compr:1; 928 unsigned int compr_type:2; 929 }; 930 931 /** 932 * struct ubifs_budg_info - UBIFS budgeting information. 933 * @idx_growth: amount of bytes budgeted for index growth 934 * @data_growth: amount of bytes budgeted for cached data 935 * @dd_growth: amount of bytes budgeted for cached data that will make 936 * other data dirty 937 * @uncommitted_idx: amount of bytes were budgeted for growth of the index, but 938 * which still have to be taken into account because the index 939 * has not been committed so far 940 * @old_idx_sz: size of index on flash 941 * @min_idx_lebs: minimum number of LEBs required for the index 942 * @nospace: non-zero if the file-system does not have flash space (used as 943 * optimization) 944 * @nospace_rp: the same as @nospace, but additionally means that even reserved 945 * pool is full 946 * @page_budget: budget for a page (constant, never changed after mount) 947 * @inode_budget: budget for an inode (constant, never changed after mount) 948 * @dent_budget: budget for a directory entry (constant, never changed after 949 * mount) 950 */ 951 struct ubifs_budg_info { 952 long long idx_growth; 953 long long data_growth; 954 long long dd_growth; 955 long long uncommitted_idx; 956 unsigned long long old_idx_sz; 957 int min_idx_lebs; 958 unsigned int nospace:1; 959 unsigned int nospace_rp:1; 960 int page_budget; 961 int inode_budget; 962 int dent_budget; 963 }; 964 965 struct ubifs_debug_info; 966 967 /** 968 * struct ubifs_info - UBIFS file-system description data structure 969 * (per-superblock). 970 * @vfs_sb: VFS @struct super_block object 971 * @bdi: backing device info object to make VFS happy and disable read-ahead 972 * 973 * @highest_inum: highest used inode number 974 * @max_sqnum: current global sequence number 975 * @cmt_no: commit number of the last successfully completed commit, protected 976 * by @commit_sem 977 * @cnt_lock: protects @highest_inum and @max_sqnum counters 978 * @fmt_version: UBIFS on-flash format version 979 * @ro_compat_version: R/O compatibility version 980 * @uuid: UUID from super block 981 * 982 * @lhead_lnum: log head logical eraseblock number 983 * @lhead_offs: log head offset 984 * @ltail_lnum: log tail logical eraseblock number (offset is always 0) 985 * @log_mutex: protects the log, @lhead_lnum, @lhead_offs, @ltail_lnum, and 986 * @bud_bytes 987 * @min_log_bytes: minimum required number of bytes in the log 988 * @cmt_bud_bytes: used during commit to temporarily amount of bytes in 989 * committed buds 990 * 991 * @buds: tree of all buds indexed by bud LEB number 992 * @bud_bytes: how many bytes of flash is used by buds 993 * @buds_lock: protects the @buds tree, @bud_bytes, and per-journal head bud 994 * lists 995 * @jhead_cnt: count of journal heads 996 * @jheads: journal heads (head zero is base head) 997 * @max_bud_bytes: maximum number of bytes allowed in buds 998 * @bg_bud_bytes: number of bud bytes when background commit is initiated 999 * @old_buds: buds to be released after commit ends 1000 * @max_bud_cnt: maximum number of buds 1001 * 1002 * @commit_sem: synchronizes committer with other processes 1003 * @cmt_state: commit state 1004 * @cs_lock: commit state lock 1005 * @cmt_wq: wait queue to sleep on if the log is full and a commit is running 1006 * 1007 * @big_lpt: flag that LPT is too big to write whole during commit 1008 * @space_fixup: flag indicating that free space in LEBs needs to be cleaned up 1009 * @no_chk_data_crc: do not check CRCs when reading data nodes (except during 1010 * recovery) 1011 * @bulk_read: enable bulk-reads 1012 * @default_compr: default compression algorithm (%UBIFS_COMPR_LZO, etc) 1013 * @rw_incompat: the media is not R/W compatible 1014 * 1015 * @tnc_mutex: protects the Tree Node Cache (TNC), @zroot, @cnext, @enext, and 1016 * @calc_idx_sz 1017 * @zroot: zbranch which points to the root index node and znode 1018 * @cnext: next znode to commit 1019 * @enext: next znode to commit to empty space 1020 * @gap_lebs: array of LEBs used by the in-gaps commit method 1021 * @cbuf: commit buffer 1022 * @ileb_buf: buffer for commit in-the-gaps method 1023 * @ileb_len: length of data in ileb_buf 1024 * @ihead_lnum: LEB number of index head 1025 * @ihead_offs: offset of index head 1026 * @ilebs: pre-allocated index LEBs 1027 * @ileb_cnt: number of pre-allocated index LEBs 1028 * @ileb_nxt: next pre-allocated index LEBs 1029 * @old_idx: tree of index nodes obsoleted since the last commit start 1030 * @bottom_up_buf: a buffer which is used by 'dirty_cow_bottom_up()' in tnc.c 1031 * 1032 * @mst_node: master node 1033 * @mst_offs: offset of valid master node 1034 * 1035 * @max_bu_buf_len: maximum bulk-read buffer length 1036 * @bu_mutex: protects the pre-allocated bulk-read buffer and @c->bu 1037 * @bu: pre-allocated bulk-read information 1038 * 1039 * @write_reserve_mutex: protects @write_reserve_buf 1040 * @write_reserve_buf: on the write path we allocate memory, which might 1041 * sometimes be unavailable, in which case we use this 1042 * write reserve buffer 1043 * 1044 * @log_lebs: number of logical eraseblocks in the log 1045 * @log_bytes: log size in bytes 1046 * @log_last: last LEB of the log 1047 * @lpt_lebs: number of LEBs used for lprops table 1048 * @lpt_first: first LEB of the lprops table area 1049 * @lpt_last: last LEB of the lprops table area 1050 * @orph_lebs: number of LEBs used for the orphan area 1051 * @orph_first: first LEB of the orphan area 1052 * @orph_last: last LEB of the orphan area 1053 * @main_lebs: count of LEBs in the main area 1054 * @main_first: first LEB of the main area 1055 * @main_bytes: main area size in bytes 1056 * 1057 * @key_hash_type: type of the key hash 1058 * @key_hash: direntry key hash function 1059 * @key_fmt: key format 1060 * @key_len: key length 1061 * @fanout: fanout of the index tree (number of links per indexing node) 1062 * 1063 * @min_io_size: minimal input/output unit size 1064 * @min_io_shift: number of bits in @min_io_size minus one 1065 * @max_write_size: maximum amount of bytes the underlying flash can write at a 1066 * time (MTD write buffer size) 1067 * @max_write_shift: number of bits in @max_write_size minus one 1068 * @leb_size: logical eraseblock size in bytes 1069 * @leb_start: starting offset of logical eraseblocks within physical 1070 * eraseblocks 1071 * @half_leb_size: half LEB size 1072 * @idx_leb_size: how many bytes of an LEB are effectively available when it is 1073 * used to store indexing nodes (@leb_size - @max_idx_node_sz) 1074 * @leb_cnt: count of logical eraseblocks 1075 * @max_leb_cnt: maximum count of logical eraseblocks 1076 * @old_leb_cnt: count of logical eraseblocks before re-size 1077 * @ro_media: the underlying UBI volume is read-only 1078 * @ro_mount: the file-system was mounted as read-only 1079 * @ro_error: UBIFS switched to R/O mode because an error happened 1080 * 1081 * @dirty_pg_cnt: number of dirty pages (not used) 1082 * @dirty_zn_cnt: number of dirty znodes 1083 * @clean_zn_cnt: number of clean znodes 1084 * 1085 * @space_lock: protects @bi and @lst 1086 * @lst: lprops statistics 1087 * @bi: budgeting information 1088 * @calc_idx_sz: temporary variable which is used to calculate new index size 1089 * (contains accurate new index size at end of TNC commit start) 1090 * 1091 * @ref_node_alsz: size of the LEB reference node aligned to the min. flash 1092 * I/O unit 1093 * @mst_node_alsz: master node aligned size 1094 * @min_idx_node_sz: minimum indexing node aligned on 8-bytes boundary 1095 * @max_idx_node_sz: maximum indexing node aligned on 8-bytes boundary 1096 * @max_inode_sz: maximum possible inode size in bytes 1097 * @max_znode_sz: size of znode in bytes 1098 * 1099 * @leb_overhead: how many bytes are wasted in an LEB when it is filled with 1100 * data nodes of maximum size - used in free space reporting 1101 * @dead_wm: LEB dead space watermark 1102 * @dark_wm: LEB dark space watermark 1103 * @block_cnt: count of 4KiB blocks on the FS 1104 * 1105 * @ranges: UBIFS node length ranges 1106 * @ubi: UBI volume descriptor 1107 * @di: UBI device information 1108 * @vi: UBI volume information 1109 * 1110 * @orph_tree: rb-tree of orphan inode numbers 1111 * @orph_list: list of orphan inode numbers in order added 1112 * @orph_new: list of orphan inode numbers added since last commit 1113 * @orph_cnext: next orphan to commit 1114 * @orph_dnext: next orphan to delete 1115 * @orphan_lock: lock for orph_tree and orph_new 1116 * @orph_buf: buffer for orphan nodes 1117 * @new_orphans: number of orphans since last commit 1118 * @cmt_orphans: number of orphans being committed 1119 * @tot_orphans: number of orphans in the rb_tree 1120 * @max_orphans: maximum number of orphans allowed 1121 * @ohead_lnum: orphan head LEB number 1122 * @ohead_offs: orphan head offset 1123 * @no_orphs: non-zero if there are no orphans 1124 * 1125 * @bgt: UBIFS background thread 1126 * @bgt_name: background thread name 1127 * @need_bgt: if background thread should run 1128 * @need_wbuf_sync: if write-buffers have to be synchronized 1129 * 1130 * @gc_lnum: LEB number used for garbage collection 1131 * @sbuf: a buffer of LEB size used by GC and replay for scanning 1132 * @idx_gc: list of index LEBs that have been garbage collected 1133 * @idx_gc_cnt: number of elements on the idx_gc list 1134 * @gc_seq: incremented for every non-index LEB garbage collected 1135 * @gced_lnum: last non-index LEB that was garbage collected 1136 * 1137 * @infos_list: links all 'ubifs_info' objects 1138 * @umount_mutex: serializes shrinker and un-mount 1139 * @shrinker_run_no: shrinker run number 1140 * 1141 * @space_bits: number of bits needed to record free or dirty space 1142 * @lpt_lnum_bits: number of bits needed to record a LEB number in the LPT 1143 * @lpt_offs_bits: number of bits needed to record an offset in the LPT 1144 * @lpt_spc_bits: number of bits needed to space in the LPT 1145 * @pcnt_bits: number of bits needed to record pnode or nnode number 1146 * @lnum_bits: number of bits needed to record LEB number 1147 * @nnode_sz: size of on-flash nnode 1148 * @pnode_sz: size of on-flash pnode 1149 * @ltab_sz: size of on-flash LPT lprops table 1150 * @lsave_sz: size of on-flash LPT save table 1151 * @pnode_cnt: number of pnodes 1152 * @nnode_cnt: number of nnodes 1153 * @lpt_hght: height of the LPT 1154 * @pnodes_have: number of pnodes in memory 1155 * 1156 * @lp_mutex: protects lprops table and all the other lprops-related fields 1157 * @lpt_lnum: LEB number of the root nnode of the LPT 1158 * @lpt_offs: offset of the root nnode of the LPT 1159 * @nhead_lnum: LEB number of LPT head 1160 * @nhead_offs: offset of LPT head 1161 * @lpt_drty_flgs: dirty flags for LPT special nodes e.g. ltab 1162 * @dirty_nn_cnt: number of dirty nnodes 1163 * @dirty_pn_cnt: number of dirty pnodes 1164 * @check_lpt_free: flag that indicates LPT GC may be needed 1165 * @lpt_sz: LPT size 1166 * @lpt_nod_buf: buffer for an on-flash nnode or pnode 1167 * @lpt_buf: buffer of LEB size used by LPT 1168 * @nroot: address in memory of the root nnode of the LPT 1169 * @lpt_cnext: next LPT node to commit 1170 * @lpt_heap: array of heaps of categorized lprops 1171 * @dirty_idx: a (reverse sorted) copy of the LPROPS_DIRTY_IDX heap as at 1172 * previous commit start 1173 * @uncat_list: list of un-categorized LEBs 1174 * @empty_list: list of empty LEBs 1175 * @freeable_list: list of freeable non-index LEBs (free + dirty == @leb_size) 1176 * @frdi_idx_list: list of freeable index LEBs (free + dirty == @leb_size) 1177 * @freeable_cnt: number of freeable LEBs in @freeable_list 1178 * @in_a_category_cnt: count of lprops which are in a certain category, which 1179 * basically meants that they were loaded from the flash 1180 * 1181 * @ltab_lnum: LEB number of LPT's own lprops table 1182 * @ltab_offs: offset of LPT's own lprops table 1183 * @ltab: LPT's own lprops table 1184 * @ltab_cmt: LPT's own lprops table (commit copy) 1185 * @lsave_cnt: number of LEB numbers in LPT's save table 1186 * @lsave_lnum: LEB number of LPT's save table 1187 * @lsave_offs: offset of LPT's save table 1188 * @lsave: LPT's save table 1189 * @lscan_lnum: LEB number of last LPT scan 1190 * 1191 * @rp_size: size of the reserved pool in bytes 1192 * @report_rp_size: size of the reserved pool reported to user-space 1193 * @rp_uid: reserved pool user ID 1194 * @rp_gid: reserved pool group ID 1195 * 1196 * @empty: %1 if the UBI device is empty 1197 * @need_recovery: %1 if the file-system needs recovery 1198 * @replaying: %1 during journal replay 1199 * @mounting: %1 while mounting 1200 * @probing: %1 while attempting to mount if MS_SILENT mount flag is set 1201 * @remounting_rw: %1 while re-mounting from R/O mode to R/W mode 1202 * @replay_list: temporary list used during journal replay 1203 * @replay_buds: list of buds to replay 1204 * @cs_sqnum: sequence number of first node in the log (commit start node) 1205 * @replay_sqnum: sequence number of node currently being replayed 1206 * @unclean_leb_list: LEBs to recover when re-mounting R/O mounted FS to R/W 1207 * mode 1208 * @rcvrd_mst_node: recovered master node to write when re-mounting R/O mounted 1209 * FS to R/W mode 1210 * @size_tree: inode size information for recovery 1211 * @mount_opts: UBIFS-specific mount options 1212 * 1213 * @dbg: debugging-related information 1214 */ 1215 struct ubifs_info { 1216 struct super_block *vfs_sb; 1217 struct backing_dev_info bdi; 1218 1219 ino_t highest_inum; 1220 unsigned long long max_sqnum; 1221 unsigned long long cmt_no; 1222 spinlock_t cnt_lock; 1223 int fmt_version; 1224 int ro_compat_version; 1225 unsigned char uuid[16]; 1226 1227 int lhead_lnum; 1228 int lhead_offs; 1229 int ltail_lnum; 1230 struct mutex log_mutex; 1231 int min_log_bytes; 1232 long long cmt_bud_bytes; 1233 1234 struct rb_root buds; 1235 long long bud_bytes; 1236 spinlock_t buds_lock; 1237 int jhead_cnt; 1238 struct ubifs_jhead *jheads; 1239 long long max_bud_bytes; 1240 long long bg_bud_bytes; 1241 struct list_head old_buds; 1242 int max_bud_cnt; 1243 1244 struct rw_semaphore commit_sem; 1245 int cmt_state; 1246 spinlock_t cs_lock; 1247 wait_queue_head_t cmt_wq; 1248 1249 unsigned int big_lpt:1; 1250 unsigned int space_fixup:1; 1251 unsigned int no_chk_data_crc:1; 1252 unsigned int bulk_read:1; 1253 unsigned int default_compr:2; 1254 unsigned int rw_incompat:1; 1255 1256 struct mutex tnc_mutex; 1257 struct ubifs_zbranch zroot; 1258 struct ubifs_znode *cnext; 1259 struct ubifs_znode *enext; 1260 int *gap_lebs; 1261 void *cbuf; 1262 void *ileb_buf; 1263 int ileb_len; 1264 int ihead_lnum; 1265 int ihead_offs; 1266 int *ilebs; 1267 int ileb_cnt; 1268 int ileb_nxt; 1269 struct rb_root old_idx; 1270 int *bottom_up_buf; 1271 1272 struct ubifs_mst_node *mst_node; 1273 int mst_offs; 1274 1275 int max_bu_buf_len; 1276 struct mutex bu_mutex; 1277 struct bu_info bu; 1278 1279 struct mutex write_reserve_mutex; 1280 void *write_reserve_buf; 1281 1282 int log_lebs; 1283 long long log_bytes; 1284 int log_last; 1285 int lpt_lebs; 1286 int lpt_first; 1287 int lpt_last; 1288 int orph_lebs; 1289 int orph_first; 1290 int orph_last; 1291 int main_lebs; 1292 int main_first; 1293 long long main_bytes; 1294 1295 uint8_t key_hash_type; 1296 uint32_t (*key_hash)(const char *str, int len); 1297 int key_fmt; 1298 int key_len; 1299 int fanout; 1300 1301 int min_io_size; 1302 int min_io_shift; 1303 int max_write_size; 1304 int max_write_shift; 1305 int leb_size; 1306 int leb_start; 1307 int half_leb_size; 1308 int idx_leb_size; 1309 int leb_cnt; 1310 int max_leb_cnt; 1311 int old_leb_cnt; 1312 unsigned int ro_media:1; 1313 unsigned int ro_mount:1; 1314 unsigned int ro_error:1; 1315 1316 atomic_long_t dirty_pg_cnt; 1317 atomic_long_t dirty_zn_cnt; 1318 atomic_long_t clean_zn_cnt; 1319 1320 spinlock_t space_lock; 1321 struct ubifs_lp_stats lst; 1322 struct ubifs_budg_info bi; 1323 unsigned long long calc_idx_sz; 1324 1325 int ref_node_alsz; 1326 int mst_node_alsz; 1327 int min_idx_node_sz; 1328 int max_idx_node_sz; 1329 long long max_inode_sz; 1330 int max_znode_sz; 1331 1332 int leb_overhead; 1333 int dead_wm; 1334 int dark_wm; 1335 int block_cnt; 1336 1337 struct ubifs_node_range ranges[UBIFS_NODE_TYPES_CNT]; 1338 struct ubi_volume_desc *ubi; 1339 struct ubi_device_info di; 1340 struct ubi_volume_info vi; 1341 1342 struct rb_root orph_tree; 1343 struct list_head orph_list; 1344 struct list_head orph_new; 1345 struct ubifs_orphan *orph_cnext; 1346 struct ubifs_orphan *orph_dnext; 1347 spinlock_t orphan_lock; 1348 void *orph_buf; 1349 int new_orphans; 1350 int cmt_orphans; 1351 int tot_orphans; 1352 int max_orphans; 1353 int ohead_lnum; 1354 int ohead_offs; 1355 int no_orphs; 1356 1357 struct task_struct *bgt; 1358 char bgt_name[sizeof(BGT_NAME_PATTERN) + 9]; 1359 int need_bgt; 1360 int need_wbuf_sync; 1361 1362 int gc_lnum; 1363 void *sbuf; 1364 struct list_head idx_gc; 1365 int idx_gc_cnt; 1366 int gc_seq; 1367 int gced_lnum; 1368 1369 struct list_head infos_list; 1370 struct mutex umount_mutex; 1371 unsigned int shrinker_run_no; 1372 1373 int space_bits; 1374 int lpt_lnum_bits; 1375 int lpt_offs_bits; 1376 int lpt_spc_bits; 1377 int pcnt_bits; 1378 int lnum_bits; 1379 int nnode_sz; 1380 int pnode_sz; 1381 int ltab_sz; 1382 int lsave_sz; 1383 int pnode_cnt; 1384 int nnode_cnt; 1385 int lpt_hght; 1386 int pnodes_have; 1387 1388 struct mutex lp_mutex; 1389 int lpt_lnum; 1390 int lpt_offs; 1391 int nhead_lnum; 1392 int nhead_offs; 1393 int lpt_drty_flgs; 1394 int dirty_nn_cnt; 1395 int dirty_pn_cnt; 1396 int check_lpt_free; 1397 long long lpt_sz; 1398 void *lpt_nod_buf; 1399 void *lpt_buf; 1400 struct ubifs_nnode *nroot; 1401 struct ubifs_cnode *lpt_cnext; 1402 struct ubifs_lpt_heap lpt_heap[LPROPS_HEAP_CNT]; 1403 struct ubifs_lpt_heap dirty_idx; 1404 struct list_head uncat_list; 1405 struct list_head empty_list; 1406 struct list_head freeable_list; 1407 struct list_head frdi_idx_list; 1408 int freeable_cnt; 1409 int in_a_category_cnt; 1410 1411 int ltab_lnum; 1412 int ltab_offs; 1413 struct ubifs_lpt_lprops *ltab; 1414 struct ubifs_lpt_lprops *ltab_cmt; 1415 int lsave_cnt; 1416 int lsave_lnum; 1417 int lsave_offs; 1418 int *lsave; 1419 int lscan_lnum; 1420 1421 long long rp_size; 1422 long long report_rp_size; 1423 kuid_t rp_uid; 1424 kgid_t rp_gid; 1425 1426 /* The below fields are used only during mounting and re-mounting */ 1427 unsigned int empty:1; 1428 unsigned int need_recovery:1; 1429 unsigned int replaying:1; 1430 unsigned int mounting:1; 1431 unsigned int remounting_rw:1; 1432 unsigned int probing:1; 1433 struct list_head replay_list; 1434 struct list_head replay_buds; 1435 unsigned long long cs_sqnum; 1436 unsigned long long replay_sqnum; 1437 struct list_head unclean_leb_list; 1438 struct ubifs_mst_node *rcvrd_mst_node; 1439 struct rb_root size_tree; 1440 struct ubifs_mount_opts mount_opts; 1441 1442 struct ubifs_debug_info *dbg; 1443 }; 1444 1445 extern struct list_head ubifs_infos; 1446 extern spinlock_t ubifs_infos_lock; 1447 extern atomic_long_t ubifs_clean_zn_cnt; 1448 extern struct kmem_cache *ubifs_inode_slab; 1449 extern const struct super_operations ubifs_super_operations; 1450 extern const struct address_space_operations ubifs_file_address_operations; 1451 extern const struct file_operations ubifs_file_operations; 1452 extern const struct inode_operations ubifs_file_inode_operations; 1453 extern const struct file_operations ubifs_dir_operations; 1454 extern const struct inode_operations ubifs_dir_inode_operations; 1455 extern const struct inode_operations ubifs_symlink_inode_operations; 1456 extern struct backing_dev_info ubifs_backing_dev_info; 1457 extern struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT]; 1458 1459 /* io.c */ 1460 void ubifs_ro_mode(struct ubifs_info *c, int err); 1461 int ubifs_leb_read(const struct ubifs_info *c, int lnum, void *buf, int offs, 1462 int len, int even_ebadmsg); 1463 int ubifs_leb_write(struct ubifs_info *c, int lnum, const void *buf, int offs, 1464 int len); 1465 int ubifs_leb_change(struct ubifs_info *c, int lnum, const void *buf, int len); 1466 int ubifs_leb_unmap(struct ubifs_info *c, int lnum); 1467 int ubifs_leb_map(struct ubifs_info *c, int lnum); 1468 int ubifs_is_mapped(const struct ubifs_info *c, int lnum); 1469 int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len); 1470 int ubifs_wbuf_seek_nolock(struct ubifs_wbuf *wbuf, int lnum, int offs); 1471 int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf); 1472 int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len, 1473 int lnum, int offs); 1474 int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len, 1475 int lnum, int offs); 1476 int ubifs_write_node(struct ubifs_info *c, void *node, int len, int lnum, 1477 int offs); 1478 int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum, 1479 int offs, int quiet, int must_chk_crc); 1480 void ubifs_prepare_node(struct ubifs_info *c, void *buf, int len, int pad); 1481 void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last); 1482 int ubifs_io_init(struct ubifs_info *c); 1483 void ubifs_pad(const struct ubifs_info *c, void *buf, int pad); 1484 int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf); 1485 int ubifs_bg_wbufs_sync(struct ubifs_info *c); 1486 void ubifs_wbuf_add_ino_nolock(struct ubifs_wbuf *wbuf, ino_t inum); 1487 int ubifs_sync_wbufs_by_inode(struct ubifs_info *c, struct inode *inode); 1488 1489 /* scan.c */ 1490 struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum, 1491 int offs, void *sbuf, int quiet); 1492 void ubifs_scan_destroy(struct ubifs_scan_leb *sleb); 1493 int ubifs_scan_a_node(const struct ubifs_info *c, void *buf, int len, int lnum, 1494 int offs, int quiet); 1495 struct ubifs_scan_leb *ubifs_start_scan(const struct ubifs_info *c, int lnum, 1496 int offs, void *sbuf); 1497 void ubifs_end_scan(const struct ubifs_info *c, struct ubifs_scan_leb *sleb, 1498 int lnum, int offs); 1499 int ubifs_add_snod(const struct ubifs_info *c, struct ubifs_scan_leb *sleb, 1500 void *buf, int offs); 1501 void ubifs_scanned_corruption(const struct ubifs_info *c, int lnum, int offs, 1502 void *buf); 1503 1504 /* log.c */ 1505 void ubifs_add_bud(struct ubifs_info *c, struct ubifs_bud *bud); 1506 void ubifs_create_buds_lists(struct ubifs_info *c); 1507 int ubifs_add_bud_to_log(struct ubifs_info *c, int jhead, int lnum, int offs); 1508 struct ubifs_bud *ubifs_search_bud(struct ubifs_info *c, int lnum); 1509 struct ubifs_wbuf *ubifs_get_wbuf(struct ubifs_info *c, int lnum); 1510 int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum); 1511 int ubifs_log_end_commit(struct ubifs_info *c, int new_ltail_lnum); 1512 int ubifs_log_post_commit(struct ubifs_info *c, int old_ltail_lnum); 1513 int ubifs_consolidate_log(struct ubifs_info *c); 1514 1515 /* journal.c */ 1516 int ubifs_jnl_update(struct ubifs_info *c, const struct inode *dir, 1517 const struct qstr *nm, const struct inode *inode, 1518 int deletion, int xent); 1519 int ubifs_jnl_write_data(struct ubifs_info *c, const struct inode *inode, 1520 const union ubifs_key *key, const void *buf, int len); 1521 int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode); 1522 int ubifs_jnl_delete_inode(struct ubifs_info *c, const struct inode *inode); 1523 int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir, 1524 const struct dentry *old_dentry, 1525 const struct inode *new_dir, 1526 const struct dentry *new_dentry, int sync); 1527 int ubifs_jnl_truncate(struct ubifs_info *c, const struct inode *inode, 1528 loff_t old_size, loff_t new_size); 1529 int ubifs_jnl_delete_xattr(struct ubifs_info *c, const struct inode *host, 1530 const struct inode *inode, const struct qstr *nm); 1531 int ubifs_jnl_change_xattr(struct ubifs_info *c, const struct inode *inode1, 1532 const struct inode *inode2); 1533 1534 /* budget.c */ 1535 int ubifs_budget_space(struct ubifs_info *c, struct ubifs_budget_req *req); 1536 void ubifs_release_budget(struct ubifs_info *c, struct ubifs_budget_req *req); 1537 void ubifs_release_dirty_inode_budget(struct ubifs_info *c, 1538 struct ubifs_inode *ui); 1539 int ubifs_budget_inode_op(struct ubifs_info *c, struct inode *inode, 1540 struct ubifs_budget_req *req); 1541 void ubifs_release_ino_dirty(struct ubifs_info *c, struct inode *inode, 1542 struct ubifs_budget_req *req); 1543 void ubifs_cancel_ino_op(struct ubifs_info *c, struct inode *inode, 1544 struct ubifs_budget_req *req); 1545 long long ubifs_get_free_space(struct ubifs_info *c); 1546 long long ubifs_get_free_space_nolock(struct ubifs_info *c); 1547 int ubifs_calc_min_idx_lebs(struct ubifs_info *c); 1548 void ubifs_convert_page_budget(struct ubifs_info *c); 1549 long long ubifs_reported_space(const struct ubifs_info *c, long long free); 1550 long long ubifs_calc_available(const struct ubifs_info *c, int min_idx_lebs); 1551 1552 /* find.c */ 1553 int ubifs_find_free_space(struct ubifs_info *c, int min_space, int *offs, 1554 int squeeze); 1555 int ubifs_find_free_leb_for_idx(struct ubifs_info *c); 1556 int ubifs_find_dirty_leb(struct ubifs_info *c, struct ubifs_lprops *ret_lp, 1557 int min_space, int pick_free); 1558 int ubifs_find_dirty_idx_leb(struct ubifs_info *c); 1559 int ubifs_save_dirty_idx_lnums(struct ubifs_info *c); 1560 1561 /* tnc.c */ 1562 int ubifs_lookup_level0(struct ubifs_info *c, const union ubifs_key *key, 1563 struct ubifs_znode **zn, int *n); 1564 int ubifs_tnc_lookup_nm(struct ubifs_info *c, const union ubifs_key *key, 1565 void *node, const struct qstr *nm); 1566 int ubifs_tnc_locate(struct ubifs_info *c, const union ubifs_key *key, 1567 void *node, int *lnum, int *offs); 1568 int ubifs_tnc_add(struct ubifs_info *c, const union ubifs_key *key, int lnum, 1569 int offs, int len); 1570 int ubifs_tnc_replace(struct ubifs_info *c, const union ubifs_key *key, 1571 int old_lnum, int old_offs, int lnum, int offs, int len); 1572 int ubifs_tnc_add_nm(struct ubifs_info *c, const union ubifs_key *key, 1573 int lnum, int offs, int len, const struct qstr *nm); 1574 int ubifs_tnc_remove(struct ubifs_info *c, const union ubifs_key *key); 1575 int ubifs_tnc_remove_nm(struct ubifs_info *c, const union ubifs_key *key, 1576 const struct qstr *nm); 1577 int ubifs_tnc_remove_range(struct ubifs_info *c, union ubifs_key *from_key, 1578 union ubifs_key *to_key); 1579 int ubifs_tnc_remove_ino(struct ubifs_info *c, ino_t inum); 1580 struct ubifs_dent_node *ubifs_tnc_next_ent(struct ubifs_info *c, 1581 union ubifs_key *key, 1582 const struct qstr *nm); 1583 void ubifs_tnc_close(struct ubifs_info *c); 1584 int ubifs_tnc_has_node(struct ubifs_info *c, union ubifs_key *key, int level, 1585 int lnum, int offs, int is_idx); 1586 int ubifs_dirty_idx_node(struct ubifs_info *c, union ubifs_key *key, int level, 1587 int lnum, int offs); 1588 /* Shared by tnc.c for tnc_commit.c */ 1589 void destroy_old_idx(struct ubifs_info *c); 1590 int is_idx_node_in_tnc(struct ubifs_info *c, union ubifs_key *key, int level, 1591 int lnum, int offs); 1592 int insert_old_idx_znode(struct ubifs_info *c, struct ubifs_znode *znode); 1593 int ubifs_tnc_get_bu_keys(struct ubifs_info *c, struct bu_info *bu); 1594 int ubifs_tnc_bulk_read(struct ubifs_info *c, struct bu_info *bu); 1595 1596 /* tnc_misc.c */ 1597 struct ubifs_znode *ubifs_tnc_levelorder_next(struct ubifs_znode *zr, 1598 struct ubifs_znode *znode); 1599 int ubifs_search_zbranch(const struct ubifs_info *c, 1600 const struct ubifs_znode *znode, 1601 const union ubifs_key *key, int *n); 1602 struct ubifs_znode *ubifs_tnc_postorder_first(struct ubifs_znode *znode); 1603 struct ubifs_znode *ubifs_tnc_postorder_next(struct ubifs_znode *znode); 1604 long ubifs_destroy_tnc_subtree(struct ubifs_znode *zr); 1605 struct ubifs_znode *ubifs_load_znode(struct ubifs_info *c, 1606 struct ubifs_zbranch *zbr, 1607 struct ubifs_znode *parent, int iip); 1608 int ubifs_tnc_read_node(struct ubifs_info *c, struct ubifs_zbranch *zbr, 1609 void *node); 1610 1611 /* tnc_commit.c */ 1612 int ubifs_tnc_start_commit(struct ubifs_info *c, struct ubifs_zbranch *zroot); 1613 int ubifs_tnc_end_commit(struct ubifs_info *c); 1614 1615 /* shrinker.c */ 1616 unsigned long ubifs_shrink_scan(struct shrinker *shrink, 1617 struct shrink_control *sc); 1618 unsigned long ubifs_shrink_count(struct shrinker *shrink, 1619 struct shrink_control *sc); 1620 1621 /* commit.c */ 1622 int ubifs_bg_thread(void *info); 1623 void ubifs_commit_required(struct ubifs_info *c); 1624 void ubifs_request_bg_commit(struct ubifs_info *c); 1625 int ubifs_run_commit(struct ubifs_info *c); 1626 void ubifs_recovery_commit(struct ubifs_info *c); 1627 int ubifs_gc_should_commit(struct ubifs_info *c); 1628 void ubifs_wait_for_commit(struct ubifs_info *c); 1629 1630 /* master.c */ 1631 int ubifs_read_master(struct ubifs_info *c); 1632 int ubifs_write_master(struct ubifs_info *c); 1633 1634 /* sb.c */ 1635 int ubifs_read_superblock(struct ubifs_info *c); 1636 struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c); 1637 int ubifs_write_sb_node(struct ubifs_info *c, struct ubifs_sb_node *sup); 1638 int ubifs_fixup_free_space(struct ubifs_info *c); 1639 1640 /* replay.c */ 1641 int ubifs_validate_entry(struct ubifs_info *c, 1642 const struct ubifs_dent_node *dent); 1643 int ubifs_replay_journal(struct ubifs_info *c); 1644 1645 /* gc.c */ 1646 int ubifs_garbage_collect(struct ubifs_info *c, int anyway); 1647 int ubifs_gc_start_commit(struct ubifs_info *c); 1648 int ubifs_gc_end_commit(struct ubifs_info *c); 1649 void ubifs_destroy_idx_gc(struct ubifs_info *c); 1650 int ubifs_get_idx_gc_leb(struct ubifs_info *c); 1651 int ubifs_garbage_collect_leb(struct ubifs_info *c, struct ubifs_lprops *lp); 1652 1653 /* orphan.c */ 1654 int ubifs_add_orphan(struct ubifs_info *c, ino_t inum); 1655 void ubifs_delete_orphan(struct ubifs_info *c, ino_t inum); 1656 int ubifs_orphan_start_commit(struct ubifs_info *c); 1657 int ubifs_orphan_end_commit(struct ubifs_info *c); 1658 int ubifs_mount_orphans(struct ubifs_info *c, int unclean, int read_only); 1659 int ubifs_clear_orphans(struct ubifs_info *c); 1660 1661 /* lpt.c */ 1662 int ubifs_calc_lpt_geom(struct ubifs_info *c); 1663 int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first, 1664 int *lpt_lebs, int *big_lpt); 1665 int ubifs_lpt_init(struct ubifs_info *c, int rd, int wr); 1666 struct ubifs_lprops *ubifs_lpt_lookup(struct ubifs_info *c, int lnum); 1667 struct ubifs_lprops *ubifs_lpt_lookup_dirty(struct ubifs_info *c, int lnum); 1668 int ubifs_lpt_scan_nolock(struct ubifs_info *c, int start_lnum, int end_lnum, 1669 ubifs_lpt_scan_callback scan_cb, void *data); 1670 1671 /* Shared by lpt.c for lpt_commit.c */ 1672 void ubifs_pack_lsave(struct ubifs_info *c, void *buf, int *lsave); 1673 void ubifs_pack_ltab(struct ubifs_info *c, void *buf, 1674 struct ubifs_lpt_lprops *ltab); 1675 void ubifs_pack_pnode(struct ubifs_info *c, void *buf, 1676 struct ubifs_pnode *pnode); 1677 void ubifs_pack_nnode(struct ubifs_info *c, void *buf, 1678 struct ubifs_nnode *nnode); 1679 struct ubifs_pnode *ubifs_get_pnode(struct ubifs_info *c, 1680 struct ubifs_nnode *parent, int iip); 1681 struct ubifs_nnode *ubifs_get_nnode(struct ubifs_info *c, 1682 struct ubifs_nnode *parent, int iip); 1683 int ubifs_read_nnode(struct ubifs_info *c, struct ubifs_nnode *parent, int iip); 1684 void ubifs_add_lpt_dirt(struct ubifs_info *c, int lnum, int dirty); 1685 void ubifs_add_nnode_dirt(struct ubifs_info *c, struct ubifs_nnode *nnode); 1686 uint32_t ubifs_unpack_bits(uint8_t **addr, int *pos, int nrbits); 1687 struct ubifs_nnode *ubifs_first_nnode(struct ubifs_info *c, int *hght); 1688 /* Needed only in debugging code in lpt_commit.c */ 1689 int ubifs_unpack_nnode(const struct ubifs_info *c, void *buf, 1690 struct ubifs_nnode *nnode); 1691 1692 /* lpt_commit.c */ 1693 int ubifs_lpt_start_commit(struct ubifs_info *c); 1694 int ubifs_lpt_end_commit(struct ubifs_info *c); 1695 int ubifs_lpt_post_commit(struct ubifs_info *c); 1696 void ubifs_lpt_free(struct ubifs_info *c, int wr_only); 1697 1698 /* lprops.c */ 1699 const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c, 1700 const struct ubifs_lprops *lp, 1701 int free, int dirty, int flags, 1702 int idx_gc_cnt); 1703 void ubifs_get_lp_stats(struct ubifs_info *c, struct ubifs_lp_stats *lst); 1704 void ubifs_add_to_cat(struct ubifs_info *c, struct ubifs_lprops *lprops, 1705 int cat); 1706 void ubifs_replace_cat(struct ubifs_info *c, struct ubifs_lprops *old_lprops, 1707 struct ubifs_lprops *new_lprops); 1708 void ubifs_ensure_cat(struct ubifs_info *c, struct ubifs_lprops *lprops); 1709 int ubifs_categorize_lprops(const struct ubifs_info *c, 1710 const struct ubifs_lprops *lprops); 1711 int ubifs_change_one_lp(struct ubifs_info *c, int lnum, int free, int dirty, 1712 int flags_set, int flags_clean, int idx_gc_cnt); 1713 int ubifs_update_one_lp(struct ubifs_info *c, int lnum, int free, int dirty, 1714 int flags_set, int flags_clean); 1715 int ubifs_read_one_lp(struct ubifs_info *c, int lnum, struct ubifs_lprops *lp); 1716 const struct ubifs_lprops *ubifs_fast_find_free(struct ubifs_info *c); 1717 const struct ubifs_lprops *ubifs_fast_find_empty(struct ubifs_info *c); 1718 const struct ubifs_lprops *ubifs_fast_find_freeable(struct ubifs_info *c); 1719 const struct ubifs_lprops *ubifs_fast_find_frdi_idx(struct ubifs_info *c); 1720 int ubifs_calc_dark(const struct ubifs_info *c, int spc); 1721 1722 /* file.c */ 1723 int ubifs_fsync(struct file *file, loff_t start, loff_t end, int datasync); 1724 int ubifs_setattr(struct dentry *dentry, struct iattr *attr); 1725 #ifdef CONFIG_UBIFS_ATIME_SUPPORT 1726 int ubifs_update_time(struct inode *inode, struct timespec *time, int flags); 1727 #endif 1728 1729 /* dir.c */ 1730 struct inode *ubifs_new_inode(struct ubifs_info *c, const struct inode *dir, 1731 umode_t mode); 1732 int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1733 struct kstat *stat); 1734 1735 /* xattr.c */ 1736 extern const struct xattr_handler *ubifs_xattr_handlers[]; 1737 ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size); 1738 int ubifs_init_security(struct inode *dentry, struct inode *inode, 1739 const struct qstr *qstr); 1740 1741 /* super.c */ 1742 struct inode *ubifs_iget(struct super_block *sb, unsigned long inum); 1743 1744 /* recovery.c */ 1745 int ubifs_recover_master_node(struct ubifs_info *c); 1746 int ubifs_write_rcvrd_mst_node(struct ubifs_info *c); 1747 struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum, 1748 int offs, void *sbuf, int jhead); 1749 struct ubifs_scan_leb *ubifs_recover_log_leb(struct ubifs_info *c, int lnum, 1750 int offs, void *sbuf); 1751 int ubifs_recover_inl_heads(struct ubifs_info *c, void *sbuf); 1752 int ubifs_clean_lebs(struct ubifs_info *c, void *sbuf); 1753 int ubifs_rcvry_gc_commit(struct ubifs_info *c); 1754 int ubifs_recover_size_accum(struct ubifs_info *c, union ubifs_key *key, 1755 int deletion, loff_t new_size); 1756 int ubifs_recover_size(struct ubifs_info *c); 1757 void ubifs_destroy_size_tree(struct ubifs_info *c); 1758 1759 /* ioctl.c */ 1760 long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 1761 void ubifs_set_inode_flags(struct inode *inode); 1762 #ifdef CONFIG_COMPAT 1763 long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 1764 #endif 1765 1766 /* compressor.c */ 1767 int __init ubifs_compressors_init(void); 1768 void ubifs_compressors_exit(void); 1769 void ubifs_compress(const struct ubifs_info *c, const void *in_buf, int in_len, 1770 void *out_buf, int *out_len, int *compr_type); 1771 int ubifs_decompress(const struct ubifs_info *c, const void *buf, int len, 1772 void *out, int *out_len, int compr_type); 1773 1774 #include "debug.h" 1775 #include "misc.h" 1776 #include "key.h" 1777 1778 /* Normal UBIFS messages */ 1779 __printf(2, 3) 1780 void ubifs_msg(const struct ubifs_info *c, const char *fmt, ...); 1781 __printf(2, 3) 1782 void ubifs_err(const struct ubifs_info *c, const char *fmt, ...); 1783 __printf(2, 3) 1784 void ubifs_warn(const struct ubifs_info *c, const char *fmt, ...); 1785 /* 1786 * A variant of 'ubifs_err()' which takes the UBIFS file-sytem description 1787 * object as an argument. 1788 */ 1789 #define ubifs_errc(c, fmt, ...) \ 1790 do { \ 1791 if (!(c)->probing) \ 1792 ubifs_err(c, fmt, ##__VA_ARGS__); \ 1793 } while (0) 1794 1795 #endif /* !__UBIFS_H__ */ 1796