logfs.h revision 20503664b008e17976bff1fdbc693c77ebd6f6c9
1/* 2 * fs/logfs/logfs.h 3 * 4 * As should be obvious for Linux kernel code, license is GPLv2 5 * 6 * Copyright (c) 2005-2008 Joern Engel <joern@logfs.org> 7 * 8 * Private header for logfs. 9 */ 10#ifndef FS_LOGFS_LOGFS_H 11#define FS_LOGFS_LOGFS_H 12 13#undef __CHECK_ENDIAN__ 14#define __CHECK_ENDIAN__ 15 16#include <linux/btree.h> 17#include <linux/crc32.h> 18#include <linux/fs.h> 19#include <linux/kernel.h> 20#include <linux/mempool.h> 21#include <linux/pagemap.h> 22#include <linux/mtd/mtd.h> 23#include "logfs_abi.h" 24 25#define LOGFS_DEBUG_SUPER (0x0001) 26#define LOGFS_DEBUG_SEGMENT (0x0002) 27#define LOGFS_DEBUG_JOURNAL (0x0004) 28#define LOGFS_DEBUG_DIR (0x0008) 29#define LOGFS_DEBUG_FILE (0x0010) 30#define LOGFS_DEBUG_INODE (0x0020) 31#define LOGFS_DEBUG_READWRITE (0x0040) 32#define LOGFS_DEBUG_GC (0x0080) 33#define LOGFS_DEBUG_GC_NOISY (0x0100) 34#define LOGFS_DEBUG_ALIASES (0x0200) 35#define LOGFS_DEBUG_BLOCKMOVE (0x0400) 36#define LOGFS_DEBUG_ALL (0xffffffff) 37 38#define LOGFS_DEBUG (0x01) 39/* 40 * To enable specific log messages, simply define LOGFS_DEBUG to match any 41 * or all of the above. 42 */ 43#ifndef LOGFS_DEBUG 44#define LOGFS_DEBUG (0) 45#endif 46 47#define log_cond(cond, fmt, arg...) do { \ 48 if (cond) \ 49 printk(KERN_DEBUG fmt, ##arg); \ 50} while (0) 51 52#define log_super(fmt, arg...) \ 53 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_SUPER, fmt, ##arg) 54#define log_segment(fmt, arg...) \ 55 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_SEGMENT, fmt, ##arg) 56#define log_journal(fmt, arg...) \ 57 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_JOURNAL, fmt, ##arg) 58#define log_dir(fmt, arg...) \ 59 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_DIR, fmt, ##arg) 60#define log_file(fmt, arg...) \ 61 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_FILE, fmt, ##arg) 62#define log_inode(fmt, arg...) \ 63 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_INODE, fmt, ##arg) 64#define log_readwrite(fmt, arg...) \ 65 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_READWRITE, fmt, ##arg) 66#define log_gc(fmt, arg...) \ 67 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_GC, fmt, ##arg) 68#define log_gc_noisy(fmt, arg...) \ 69 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_GC_NOISY, fmt, ##arg) 70#define log_aliases(fmt, arg...) \ 71 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_ALIASES, fmt, ##arg) 72#define log_blockmove(fmt, arg...) \ 73 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_BLOCKMOVE, fmt, ##arg) 74 75#define PG_pre_locked PG_owner_priv_1 76#define PagePreLocked(page) test_bit(PG_pre_locked, &(page)->flags) 77#define SetPagePreLocked(page) set_bit(PG_pre_locked, &(page)->flags) 78#define ClearPagePreLocked(page) clear_bit(PG_pre_locked, &(page)->flags) 79 80/* FIXME: This should really be somewhere in the 64bit area. */ 81#define LOGFS_LINK_MAX (1<<30) 82 83/* Read-only filesystem */ 84#define LOGFS_SB_FLAG_RO 0x0001 85#define LOGFS_SB_FLAG_DIRTY 0x0002 86#define LOGFS_SB_FLAG_OBJ_ALIAS 0x0004 87#define LOGFS_SB_FLAG_SHUTDOWN 0x0008 88 89/* Write Control Flags */ 90#define WF_LOCK 0x01 /* take write lock */ 91#define WF_WRITE 0x02 /* write block */ 92#define WF_DELETE 0x04 /* delete old block */ 93 94typedef u8 __bitwise level_t; 95typedef u8 __bitwise gc_level_t; 96 97#define LEVEL(level) ((__force level_t)(level)) 98#define GC_LEVEL(gc_level) ((__force gc_level_t)(gc_level)) 99 100#define SUBLEVEL(level) ( (void)((level) == LEVEL(1)), \ 101 (__force level_t)((__force u8)(level) - 1) ) 102 103/** 104 * struct logfs_area - area management information 105 * 106 * @a_sb: the superblock this area belongs to 107 * @a_is_open: 1 if the area is currently open, else 0 108 * @a_segno: segment number of area 109 * @a_written_bytes: number of bytes already written back 110 * @a_used_bytes: number of used bytes 111 * @a_ops: area operations (either journal or ostore) 112 * @a_erase_count: erase count 113 * @a_level: GC level 114 */ 115struct logfs_area { /* a segment open for writing */ 116 struct super_block *a_sb; 117 int a_is_open; 118 u32 a_segno; 119 u32 a_written_bytes; 120 u32 a_used_bytes; 121 const struct logfs_area_ops *a_ops; 122 u32 a_erase_count; 123 gc_level_t a_level; 124}; 125 126/** 127 * struct logfs_area_ops - area operations 128 * 129 * @get_free_segment: fill area->ofs with the offset of a free segment 130 * @get_erase_count: fill area->erase_count (needs area->ofs) 131 * @erase_segment: erase and setup segment 132 */ 133struct logfs_area_ops { 134 void (*get_free_segment)(struct logfs_area *area); 135 void (*get_erase_count)(struct logfs_area *area); 136 int (*erase_segment)(struct logfs_area *area); 137}; 138 139/** 140 * struct logfs_device_ops - device access operations 141 * 142 * @readpage: read one page (mm page) 143 * @writeseg: write one segment. may be a partial segment 144 * @erase: erase one segment 145 * @read: read from the device 146 * @erase: erase part of the device 147 */ 148struct logfs_device_ops { 149 struct page *(*find_first_sb)(struct super_block *sb, u64 *ofs); 150 struct page *(*find_last_sb)(struct super_block *sb, u64 *ofs); 151 int (*write_sb)(struct super_block *sb, struct page *page); 152 int (*readpage)(void *_sb, struct page *page); 153 void (*writeseg)(struct super_block *sb, u64 ofs, size_t len); 154 int (*erase)(struct super_block *sb, loff_t ofs, size_t len, 155 int ensure_write); 156 void (*sync)(struct super_block *sb); 157 void (*put_device)(struct super_block *sb); 158}; 159 160/** 161 * struct candidate_list - list of similar candidates 162 */ 163struct candidate_list { 164 struct rb_root rb_tree; 165 int count; 166 int maxcount; 167 int sort_by_ec; 168}; 169 170/** 171 * struct gc_candidate - "candidate" segment to be garbage collected next 172 * 173 * @list: list (either free of low) 174 * @segno: segment number 175 * @valid: number of valid bytes 176 * @erase_count: erase count of segment 177 * @dist: distance from tree root 178 * 179 * Candidates can be on two lists. The free list contains electees rather 180 * than candidates - segments that no longer contain any valid data. The 181 * low list contains candidates to be picked for GC. It should be kept 182 * short. It is not required to always pick a perfect candidate. In the 183 * worst case GC will have to move more data than absolutely necessary. 184 */ 185struct gc_candidate { 186 struct rb_node rb_node; 187 struct candidate_list *list; 188 u32 segno; 189 u32 valid; 190 u32 erase_count; 191 u8 dist; 192}; 193 194/** 195 * struct logfs_journal_entry - temporary structure used during journal scan 196 * 197 * @used: 198 * @version: normalized version 199 * @len: length 200 * @offset: offset 201 */ 202struct logfs_journal_entry { 203 int used; 204 s16 version; 205 u16 len; 206 u16 datalen; 207 u64 offset; 208}; 209 210enum transaction_state { 211 CREATE_1 = 1, 212 CREATE_2, 213 UNLINK_1, 214 UNLINK_2, 215 CROSS_RENAME_1, 216 CROSS_RENAME_2, 217 TARGET_RENAME_1, 218 TARGET_RENAME_2, 219 TARGET_RENAME_3 220}; 221 222/** 223 * struct logfs_transaction - essential fields to support atomic dirops 224 * 225 * @ino: target inode 226 * @dir: inode of directory containing dentry 227 * @pos: pos of dentry in directory 228 */ 229struct logfs_transaction { 230 enum transaction_state state; 231 u64 ino; 232 u64 dir; 233 u64 pos; 234}; 235 236/** 237 * struct logfs_shadow - old block in the shadow of a not-yet-committed new one 238 * @old_ofs: offset of old block on medium 239 * @new_ofs: offset of new block on medium 240 * @ino: inode number 241 * @bix: block index 242 * @old_len: size of old block, including header 243 * @new_len: size of new block, including header 244 * @level: block level 245 */ 246struct logfs_shadow { 247 u64 old_ofs; 248 u64 new_ofs; 249 u64 ino; 250 u64 bix; 251 int old_len; 252 int new_len; 253 gc_level_t gc_level; 254}; 255 256/** 257 * struct shadow_tree 258 * @new: shadows where old_ofs==0, indexed by new_ofs 259 * @old: shadows where old_ofs!=0, indexed by old_ofs 260 * @segment_map: bitfield of segments containing shadows 261 * @no_shadowed_segment: number of segments containing shadows 262 */ 263struct shadow_tree { 264 struct btree_head64 new; 265 struct btree_head64 old; 266 struct btree_head32 segment_map; 267 int no_shadowed_segments; 268}; 269 270struct object_alias_item { 271 struct list_head list; 272 __be64 val; 273 int child_no; 274}; 275 276/** 277 * struct logfs_block - contains any block state 278 * @type: indirect block or inode 279 * @full: number of fully populated children 280 * @partial: number of partially populated children 281 * 282 * Most blocks are directly represented by page cache pages. But when a block 283 * becomes dirty, is part of a transaction, contains aliases or is otherwise 284 * special, a struct logfs_block is allocated to track the additional state. 285 * Inodes are very similar to indirect blocks, so they can also get one of 286 * these structures added when appropriate. 287 */ 288#define BLOCK_INDIRECT 1 /* Indirect block */ 289#define BLOCK_INODE 2 /* Inode */ 290struct logfs_block_ops; 291struct logfs_block { 292 struct list_head alias_list; 293 struct list_head item_list; 294 struct super_block *sb; 295 u64 ino; 296 u64 bix; 297 level_t level; 298 struct page *page; 299 struct inode *inode; 300 struct logfs_transaction *ta; 301 unsigned long alias_map[LOGFS_BLOCK_FACTOR / BITS_PER_LONG]; 302 struct logfs_block_ops *ops; 303 int full; 304 int partial; 305 int reserved_bytes; 306}; 307 308typedef int write_alias_t(struct super_block *sb, u64 ino, u64 bix, 309 level_t level, int child_no, __be64 val); 310struct logfs_block_ops { 311 void (*write_block)(struct logfs_block *block); 312 void (*free_block)(struct super_block *sb, struct logfs_block*block); 313 int (*write_alias)(struct super_block *sb, 314 struct logfs_block *block, 315 write_alias_t *write_one_alias); 316}; 317 318#define MAX_JOURNAL_ENTRIES 256 319 320struct logfs_super { 321 struct mtd_info *s_mtd; /* underlying device */ 322 struct block_device *s_bdev; /* underlying device */ 323 const struct logfs_device_ops *s_devops;/* device access */ 324 struct inode *s_master_inode; /* inode file */ 325 struct inode *s_segfile_inode; /* segment file */ 326 struct inode *s_mapping_inode; /* device mapping */ 327 atomic_t s_pending_writes; /* outstanting bios */ 328 long s_flags; 329 mempool_t *s_btree_pool; /* for btree nodes */ 330 mempool_t *s_alias_pool; /* aliases in segment.c */ 331 u64 s_feature_incompat; 332 u64 s_feature_ro_compat; 333 u64 s_feature_compat; 334 u64 s_feature_flags; 335 u64 s_sb_ofs[2]; 336 struct page *s_erase_page; /* for dev_bdev.c */ 337 /* alias.c fields */ 338 struct btree_head32 s_segment_alias; /* remapped segments */ 339 int s_no_object_aliases; 340 struct list_head s_object_alias; /* remapped objects */ 341 struct btree_head128 s_object_alias_tree; /* remapped objects */ 342 struct mutex s_object_alias_mutex; 343 /* dir.c fields */ 344 struct mutex s_dirop_mutex; /* for creat/unlink/rename */ 345 u64 s_victim_ino; /* used for atomic dir-ops */ 346 u64 s_rename_dir; /* source directory ino */ 347 u64 s_rename_pos; /* position of source dd */ 348 /* gc.c fields */ 349 long s_segsize; /* size of a segment */ 350 int s_segshift; /* log2 of segment size */ 351 long s_segmask; /* 1 << s_segshift - 1 */ 352 long s_no_segs; /* segments on device */ 353 long s_no_journal_segs; /* segments used for journal */ 354 long s_no_blocks; /* blocks per segment */ 355 long s_writesize; /* minimum write size */ 356 int s_writeshift; /* log2 of write size */ 357 u64 s_size; /* filesystem size */ 358 struct logfs_area *s_area[LOGFS_NO_AREAS]; /* open segment array */ 359 u64 s_gec; /* global erase count */ 360 u64 s_wl_gec_ostore; /* time of last wl event */ 361 u64 s_wl_gec_journal; /* time of last wl event */ 362 u64 s_sweeper; /* current sweeper pos */ 363 u8 s_ifile_levels; /* max level of ifile */ 364 u8 s_iblock_levels; /* max level of regular files */ 365 u8 s_data_levels; /* # of segments to leaf block*/ 366 u8 s_total_levels; /* sum of above three */ 367 struct btree_head32 s_cand_tree; /* all candidates */ 368 struct candidate_list s_free_list; /* 100% free segments */ 369 struct candidate_list s_reserve_list; /* Bad segment reserve */ 370 struct candidate_list s_low_list[LOGFS_NO_AREAS];/* good candidates */ 371 struct candidate_list s_ec_list; /* wear level candidates */ 372 struct btree_head32 s_reserved_segments;/* sb, journal, bad, etc. */ 373 /* inode.c fields */ 374 u64 s_last_ino; /* highest ino used */ 375 long s_inos_till_wrap; 376 u32 s_generation; /* i_generation for new files */ 377 struct list_head s_freeing_list; /* inodes being freed */ 378 /* journal.c fields */ 379 struct mutex s_journal_mutex; 380 void *s_je; /* journal entry to compress */ 381 void *s_compressed_je; /* block to write to journal */ 382 u32 s_journal_seg[LOGFS_JOURNAL_SEGS]; /* journal segments */ 383 u32 s_journal_ec[LOGFS_JOURNAL_SEGS]; /* journal erasecounts */ 384 u64 s_last_version; 385 struct logfs_area *s_journal_area; /* open journal segment */ 386 __be64 s_je_array[MAX_JOURNAL_ENTRIES]; 387 int s_no_je; 388 389 int s_sum_index; /* for the 12 summaries */ 390 struct shadow_tree s_shadow_tree; 391 int s_je_fill; /* index of current je */ 392 /* readwrite.c fields */ 393 struct mutex s_write_mutex; 394 int s_lock_count; 395 mempool_t *s_block_pool; /* struct logfs_block pool */ 396 mempool_t *s_shadow_pool; /* struct logfs_shadow pool */ 397 /* 398 * Space accounting: 399 * - s_used_bytes specifies space used to store valid data objects. 400 * - s_dirty_used_bytes is space used to store non-committed data 401 * objects. Those objects have already been written themselves, 402 * but they don't become valid until all indirect blocks up to the 403 * journal have been written as well. 404 * - s_dirty_free_bytes is space used to store the old copy of a 405 * replaced object, as long as the replacement is non-committed. 406 * In other words, it is the amount of space freed when all dirty 407 * blocks are written back. 408 * - s_free_bytes is the amount of free space available for any 409 * purpose. 410 * - s_root_reserve is the amount of free space available only to 411 * the root user. Non-privileged users can no longer write once 412 * this watermark has been reached. 413 * - s_speed_reserve is space which remains unused to speed up 414 * garbage collection performance. 415 * - s_dirty_pages is the space reserved for currently dirty pages. 416 * It is a pessimistic estimate, so some/most will get freed on 417 * page writeback. 418 * 419 * s_used_bytes + s_free_bytes + s_speed_reserve = total usable size 420 */ 421 u64 s_free_bytes; 422 u64 s_used_bytes; 423 u64 s_dirty_free_bytes; 424 u64 s_dirty_used_bytes; 425 u64 s_root_reserve; 426 u64 s_speed_reserve; 427 u64 s_dirty_pages; 428 /* Bad block handling: 429 * - s_bad_seg_reserve is a number of segments usually kept 430 * free. When encountering bad blocks, the affected segment's data 431 * is _temporarily_ moved to a reserved segment. 432 * - s_bad_segments is the number of known bad segments. 433 */ 434 u32 s_bad_seg_reserve; 435 u32 s_bad_segments; 436}; 437 438/** 439 * struct logfs_inode - in-memory inode 440 * 441 * @vfs_inode: struct inode 442 * @li_data: data pointers 443 * @li_used_bytes: number of used bytes 444 * @li_freeing_list: used to track inodes currently being freed 445 * @li_flags: inode flags 446 * @li_refcount: number of internal (GC-induced) references 447 */ 448struct logfs_inode { 449 struct inode vfs_inode; 450 u64 li_data[LOGFS_EMBEDDED_FIELDS]; 451 u64 li_used_bytes; 452 struct list_head li_freeing_list; 453 struct logfs_block *li_block; 454 u32 li_flags; 455 u8 li_height; 456 int li_refcount; 457}; 458 459#define journal_for_each(__i) for (__i = 0; __i < LOGFS_JOURNAL_SEGS; __i++) 460#define for_each_area(__i) for (__i = 0; __i < LOGFS_NO_AREAS; __i++) 461#define for_each_area_down(__i) for (__i = LOGFS_NO_AREAS - 1; __i >= 0; __i--) 462 463/* compr.c */ 464int logfs_compress(void *in, void *out, size_t inlen, size_t outlen); 465int logfs_uncompress(void *in, void *out, size_t inlen, size_t outlen); 466int __init logfs_compr_init(void); 467void logfs_compr_exit(void); 468 469/* dev_bdev.c */ 470#ifdef CONFIG_BLOCK 471int logfs_get_sb_bdev(struct file_system_type *type, int flags, 472 const char *devname, struct vfsmount *mnt); 473#else 474static inline int logfs_get_sb_bdev(struct file_system_type *type, int flags, 475 const char *devname, struct vfsmount *mnt) 476{ 477 return -ENODEV; 478} 479#endif 480 481/* dev_mtd.c */ 482#ifdef CONFIG_MTD 483int logfs_get_sb_mtd(struct file_system_type *type, int flags, 484 int mtdnr, struct vfsmount *mnt); 485#else 486static inline int logfs_get_sb_mtd(struct file_system_type *type, int flags, 487 int mtdnr, struct vfsmount *mnt) 488{ 489 return -ENODEV; 490} 491#endif 492 493/* dir.c */ 494extern const struct inode_operations logfs_symlink_iops; 495extern const struct inode_operations logfs_dir_iops; 496extern const struct file_operations logfs_dir_fops; 497int logfs_replay_journal(struct super_block *sb); 498 499/* file.c */ 500extern const struct inode_operations logfs_reg_iops; 501extern const struct file_operations logfs_reg_fops; 502extern const struct address_space_operations logfs_reg_aops; 503int logfs_readpage(struct file *file, struct page *page); 504int logfs_ioctl(struct inode *inode, struct file *file, unsigned int cmd, 505 unsigned long arg); 506int logfs_fsync(struct file *file, struct dentry *dentry, int datasync); 507 508/* gc.c */ 509u32 get_best_cand(struct super_block *sb, struct candidate_list *list, u32 *ec); 510void logfs_gc_pass(struct super_block *sb); 511int logfs_check_areas(struct super_block *sb); 512int logfs_init_gc(struct super_block *sb); 513void logfs_cleanup_gc(struct super_block *sb); 514 515/* inode.c */ 516extern const struct super_operations logfs_super_operations; 517struct inode *logfs_iget(struct super_block *sb, ino_t ino); 518struct inode *logfs_safe_iget(struct super_block *sb, ino_t ino, int *cookie); 519void logfs_safe_iput(struct inode *inode, int cookie); 520struct inode *logfs_new_inode(struct inode *dir, int mode); 521struct inode *logfs_new_meta_inode(struct super_block *sb, u64 ino); 522struct inode *logfs_read_meta_inode(struct super_block *sb, u64 ino); 523int logfs_init_inode_cache(void); 524void logfs_destroy_inode_cache(void); 525void destroy_meta_inode(struct inode *inode); 526void logfs_set_blocks(struct inode *inode, u64 no); 527/* these logically belong into inode.c but actually reside in readwrite.c */ 528int logfs_read_inode(struct inode *inode); 529int __logfs_write_inode(struct inode *inode, long flags); 530void logfs_delete_inode(struct inode *inode); 531void logfs_clear_inode(struct inode *inode); 532 533/* journal.c */ 534void logfs_write_anchor(struct super_block *sb); 535int logfs_init_journal(struct super_block *sb); 536void logfs_cleanup_journal(struct super_block *sb); 537int write_alias_journal(struct super_block *sb, u64 ino, u64 bix, 538 level_t level, int child_no, __be64 val); 539void do_logfs_journal_wl_pass(struct super_block *sb); 540 541/* readwrite.c */ 542pgoff_t logfs_pack_index(u64 bix, level_t level); 543void logfs_unpack_index(pgoff_t index, u64 *bix, level_t *level); 544int logfs_inode_write(struct inode *inode, const void *buf, size_t count, 545 loff_t bix, long flags, struct shadow_tree *shadow_tree); 546int logfs_readpage_nolock(struct page *page); 547int logfs_write_buf(struct inode *inode, struct page *page, long flags); 548int logfs_delete(struct inode *inode, pgoff_t index, 549 struct shadow_tree *shadow_tree); 550int logfs_rewrite_block(struct inode *inode, u64 bix, u64 ofs, 551 gc_level_t gc_level, long flags); 552int logfs_is_valid_block(struct super_block *sb, u64 ofs, u64 ino, u64 bix, 553 gc_level_t gc_level); 554int logfs_truncate(struct inode *inode, u64 size); 555u64 logfs_seek_hole(struct inode *inode, u64 bix); 556u64 logfs_seek_data(struct inode *inode, u64 bix); 557int logfs_open_segfile(struct super_block *sb); 558int logfs_init_rw(struct super_block *sb); 559void logfs_cleanup_rw(struct super_block *sb); 560void logfs_add_transaction(struct inode *inode, struct logfs_transaction *ta); 561void logfs_del_transaction(struct inode *inode, struct logfs_transaction *ta); 562void logfs_write_block(struct logfs_block *block, long flags); 563int logfs_write_obj_aliases_pagecache(struct super_block *sb); 564void logfs_get_segment_entry(struct super_block *sb, u32 segno, 565 struct logfs_segment_entry *se); 566void logfs_set_segment_used(struct super_block *sb, u64 ofs, int increment); 567void logfs_set_segment_erased(struct super_block *sb, u32 segno, u32 ec, 568 gc_level_t gc_level); 569void logfs_set_segment_reserved(struct super_block *sb, u32 segno); 570void logfs_set_segment_unreserved(struct super_block *sb, u32 segno, u32 ec); 571struct logfs_block *__alloc_block(struct super_block *sb, 572 u64 ino, u64 bix, level_t level); 573void __free_block(struct super_block *sb, struct logfs_block *block); 574void btree_write_block(struct logfs_block *block); 575void initialize_block_counters(struct page *page, struct logfs_block *block, 576 __be64 *array, int page_is_empty); 577int logfs_exist_block(struct inode *inode, u64 bix); 578int get_page_reserve(struct inode *inode, struct page *page); 579extern struct logfs_block_ops indirect_block_ops; 580 581/* segment.c */ 582int logfs_erase_segment(struct super_block *sb, u32 ofs, int ensure_erase); 583int wbuf_read(struct super_block *sb, u64 ofs, size_t len, void *buf); 584int logfs_segment_read(struct inode *inode, struct page *page, u64 ofs, u64 bix, 585 level_t level); 586int logfs_segment_write(struct inode *inode, struct page *page, 587 struct logfs_shadow *shadow); 588int logfs_segment_delete(struct inode *inode, struct logfs_shadow *shadow); 589int logfs_load_object_aliases(struct super_block *sb, 590 struct logfs_obj_alias *oa, int count); 591void move_page_to_btree(struct page *page); 592int logfs_init_mapping(struct super_block *sb); 593void logfs_sync_area(struct logfs_area *area); 594void logfs_sync_segments(struct super_block *sb); 595void freeseg(struct super_block *sb, u32 segno); 596 597/* area handling */ 598int logfs_init_areas(struct super_block *sb); 599void logfs_cleanup_areas(struct super_block *sb); 600int logfs_open_area(struct logfs_area *area, size_t bytes); 601int __logfs_buf_write(struct logfs_area *area, u64 ofs, void *buf, size_t len, 602 int use_filler); 603 604static inline int logfs_buf_write(struct logfs_area *area, u64 ofs, 605 void *buf, size_t len) 606{ 607 return __logfs_buf_write(area, ofs, buf, len, 0); 608} 609 610static inline int logfs_buf_recover(struct logfs_area *area, u64 ofs, 611 void *buf, size_t len) 612{ 613 return __logfs_buf_write(area, ofs, buf, len, 1); 614} 615 616/* super.c */ 617struct page *emergency_read_begin(struct address_space *mapping, pgoff_t index); 618void emergency_read_end(struct page *page); 619void logfs_crash_dump(struct super_block *sb); 620void *memchr_inv(const void *s, int c, size_t n); 621int logfs_statfs(struct dentry *dentry, struct kstatfs *stats); 622int logfs_get_sb_device(struct file_system_type *type, int flags, 623 struct mtd_info *mtd, struct block_device *bdev, 624 const struct logfs_device_ops *devops, struct vfsmount *mnt); 625int logfs_check_ds(struct logfs_disk_super *ds); 626int logfs_write_sb(struct super_block *sb); 627 628static inline struct logfs_super *logfs_super(struct super_block *sb) 629{ 630 return sb->s_fs_info; 631} 632 633static inline struct logfs_inode *logfs_inode(struct inode *inode) 634{ 635 return container_of(inode, struct logfs_inode, vfs_inode); 636} 637 638static inline void logfs_set_ro(struct super_block *sb) 639{ 640 logfs_super(sb)->s_flags |= LOGFS_SB_FLAG_RO; 641} 642 643#define LOGFS_BUG(sb) do { \ 644 struct super_block *__sb = sb; \ 645 logfs_crash_dump(__sb); \ 646 logfs_super(__sb)->s_flags |= LOGFS_SB_FLAG_RO; \ 647 BUG(); \ 648} while (0) 649 650#define LOGFS_BUG_ON(condition, sb) \ 651 do { if (unlikely(condition)) LOGFS_BUG((sb)); } while (0) 652 653static inline __be32 logfs_crc32(void *data, size_t len, size_t skip) 654{ 655 return cpu_to_be32(crc32(~0, data+skip, len-skip)); 656} 657 658static inline u8 logfs_type(struct inode *inode) 659{ 660 return (inode->i_mode >> 12) & 15; 661} 662 663static inline pgoff_t logfs_index(struct super_block *sb, u64 pos) 664{ 665 return pos >> sb->s_blocksize_bits; 666} 667 668static inline u64 dev_ofs(struct super_block *sb, u32 segno, u32 ofs) 669{ 670 return ((u64)segno << logfs_super(sb)->s_segshift) + ofs; 671} 672 673static inline u32 seg_no(struct super_block *sb, u64 ofs) 674{ 675 return ofs >> logfs_super(sb)->s_segshift; 676} 677 678static inline u32 seg_ofs(struct super_block *sb, u64 ofs) 679{ 680 return ofs & logfs_super(sb)->s_segmask; 681} 682 683static inline u64 seg_align(struct super_block *sb, u64 ofs) 684{ 685 return ofs & ~logfs_super(sb)->s_segmask; 686} 687 688static inline struct logfs_block *logfs_block(struct page *page) 689{ 690 return (void *)page->private; 691} 692 693static inline level_t shrink_level(gc_level_t __level) 694{ 695 u8 level = (__force u8)__level; 696 697 if (level >= LOGFS_MAX_LEVELS) 698 level -= LOGFS_MAX_LEVELS; 699 return (__force level_t)level; 700} 701 702static inline gc_level_t expand_level(u64 ino, level_t __level) 703{ 704 u8 level = (__force u8)__level; 705 706 if (ino == LOGFS_INO_MASTER) { 707 /* ifile has seperate areas */ 708 level += LOGFS_MAX_LEVELS; 709 } 710 return (__force gc_level_t)level; 711} 712 713static inline int logfs_block_shift(struct super_block *sb, level_t level) 714{ 715 level = shrink_level((__force gc_level_t)level); 716 return (__force int)level * (sb->s_blocksize_bits - 3); 717} 718 719static inline u64 logfs_block_mask(struct super_block *sb, level_t level) 720{ 721 return ~0ull << logfs_block_shift(sb, level); 722} 723 724static inline struct logfs_area *get_area(struct super_block *sb, 725 gc_level_t gc_level) 726{ 727 return logfs_super(sb)->s_area[(__force u8)gc_level]; 728} 729 730static inline void logfs_mempool_destroy(mempool_t *pool) 731{ 732 if (pool) 733 mempool_destroy(pool); 734} 735 736#endif 737