logfs.h revision 0d85c799623cb6022adb1317ed2987ab9c097c2e
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 * @can_write_buf: decide whether wbuf can be written to ofs 148 */ 149struct logfs_device_ops { 150 struct page *(*find_first_sb)(struct super_block *sb, u64 *ofs); 151 struct page *(*find_last_sb)(struct super_block *sb, u64 *ofs); 152 int (*write_sb)(struct super_block *sb, struct page *page); 153 int (*readpage)(void *_sb, struct page *page); 154 void (*writeseg)(struct super_block *sb, u64 ofs, size_t len); 155 int (*erase)(struct super_block *sb, loff_t ofs, size_t len, 156 int ensure_write); 157 int (*can_write_buf)(struct super_block *sb, u64 ofs); 158 void (*sync)(struct super_block *sb); 159 void (*put_device)(struct super_block *sb); 160}; 161 162/** 163 * struct candidate_list - list of similar candidates 164 */ 165struct candidate_list { 166 struct rb_root rb_tree; 167 int count; 168 int maxcount; 169 int sort_by_ec; 170}; 171 172/** 173 * struct gc_candidate - "candidate" segment to be garbage collected next 174 * 175 * @list: list (either free of low) 176 * @segno: segment number 177 * @valid: number of valid bytes 178 * @erase_count: erase count of segment 179 * @dist: distance from tree root 180 * 181 * Candidates can be on two lists. The free list contains electees rather 182 * than candidates - segments that no longer contain any valid data. The 183 * low list contains candidates to be picked for GC. It should be kept 184 * short. It is not required to always pick a perfect candidate. In the 185 * worst case GC will have to move more data than absolutely necessary. 186 */ 187struct gc_candidate { 188 struct rb_node rb_node; 189 struct candidate_list *list; 190 u32 segno; 191 u32 valid; 192 u32 erase_count; 193 u8 dist; 194}; 195 196/** 197 * struct logfs_journal_entry - temporary structure used during journal scan 198 * 199 * @used: 200 * @version: normalized version 201 * @len: length 202 * @offset: offset 203 */ 204struct logfs_journal_entry { 205 int used; 206 s16 version; 207 u16 len; 208 u16 datalen; 209 u64 offset; 210}; 211 212enum transaction_state { 213 CREATE_1 = 1, 214 CREATE_2, 215 UNLINK_1, 216 UNLINK_2, 217 CROSS_RENAME_1, 218 CROSS_RENAME_2, 219 TARGET_RENAME_1, 220 TARGET_RENAME_2, 221 TARGET_RENAME_3 222}; 223 224/** 225 * struct logfs_transaction - essential fields to support atomic dirops 226 * 227 * @ino: target inode 228 * @dir: inode of directory containing dentry 229 * @pos: pos of dentry in directory 230 */ 231struct logfs_transaction { 232 enum transaction_state state; 233 u64 ino; 234 u64 dir; 235 u64 pos; 236}; 237 238/** 239 * struct logfs_shadow - old block in the shadow of a not-yet-committed new one 240 * @old_ofs: offset of old block on medium 241 * @new_ofs: offset of new block on medium 242 * @ino: inode number 243 * @bix: block index 244 * @old_len: size of old block, including header 245 * @new_len: size of new block, including header 246 * @level: block level 247 */ 248struct logfs_shadow { 249 u64 old_ofs; 250 u64 new_ofs; 251 u64 ino; 252 u64 bix; 253 int old_len; 254 int new_len; 255 gc_level_t gc_level; 256}; 257 258/** 259 * struct shadow_tree 260 * @new: shadows where old_ofs==0, indexed by new_ofs 261 * @old: shadows where old_ofs!=0, indexed by old_ofs 262 * @segment_map: bitfield of segments containing shadows 263 * @no_shadowed_segment: number of segments containing shadows 264 */ 265struct shadow_tree { 266 struct btree_head64 new; 267 struct btree_head64 old; 268 struct btree_head32 segment_map; 269 int no_shadowed_segments; 270}; 271 272struct object_alias_item { 273 struct list_head list; 274 __be64 val; 275 int child_no; 276}; 277 278/** 279 * struct logfs_block - contains any block state 280 * @type: indirect block or inode 281 * @full: number of fully populated children 282 * @partial: number of partially populated children 283 * 284 * Most blocks are directly represented by page cache pages. But when a block 285 * becomes dirty, is part of a transaction, contains aliases or is otherwise 286 * special, a struct logfs_block is allocated to track the additional state. 287 * Inodes are very similar to indirect blocks, so they can also get one of 288 * these structures added when appropriate. 289 */ 290#define BLOCK_INDIRECT 1 /* Indirect block */ 291#define BLOCK_INODE 2 /* Inode */ 292struct logfs_block_ops; 293struct logfs_block { 294 struct list_head alias_list; 295 struct list_head item_list; 296 struct super_block *sb; 297 u64 ino; 298 u64 bix; 299 level_t level; 300 struct page *page; 301 struct inode *inode; 302 struct logfs_transaction *ta; 303 unsigned long alias_map[LOGFS_BLOCK_FACTOR / BITS_PER_LONG]; 304 struct logfs_block_ops *ops; 305 int full; 306 int partial; 307 int reserved_bytes; 308}; 309 310typedef int write_alias_t(struct super_block *sb, u64 ino, u64 bix, 311 level_t level, int child_no, __be64 val); 312struct logfs_block_ops { 313 void (*write_block)(struct logfs_block *block); 314 void (*free_block)(struct super_block *sb, struct logfs_block*block); 315 int (*write_alias)(struct super_block *sb, 316 struct logfs_block *block, 317 write_alias_t *write_one_alias); 318}; 319 320#define MAX_JOURNAL_ENTRIES 256 321 322struct logfs_super { 323 struct mtd_info *s_mtd; /* underlying device */ 324 struct block_device *s_bdev; /* underlying device */ 325 const struct logfs_device_ops *s_devops;/* device access */ 326 struct inode *s_master_inode; /* inode file */ 327 struct inode *s_segfile_inode; /* segment file */ 328 struct inode *s_mapping_inode; /* device mapping */ 329 atomic_t s_pending_writes; /* outstanting bios */ 330 long s_flags; 331 mempool_t *s_btree_pool; /* for btree nodes */ 332 mempool_t *s_alias_pool; /* aliases in segment.c */ 333 u64 s_feature_incompat; 334 u64 s_feature_ro_compat; 335 u64 s_feature_compat; 336 u64 s_feature_flags; 337 u64 s_sb_ofs[2]; 338 struct page *s_erase_page; /* for dev_bdev.c */ 339 /* alias.c fields */ 340 struct btree_head32 s_segment_alias; /* remapped segments */ 341 int s_no_object_aliases; 342 struct list_head s_object_alias; /* remapped objects */ 343 struct btree_head128 s_object_alias_tree; /* remapped objects */ 344 struct mutex s_object_alias_mutex; 345 /* dir.c fields */ 346 struct mutex s_dirop_mutex; /* for creat/unlink/rename */ 347 u64 s_victim_ino; /* used for atomic dir-ops */ 348 u64 s_rename_dir; /* source directory ino */ 349 u64 s_rename_pos; /* position of source dd */ 350 /* gc.c fields */ 351 long s_segsize; /* size of a segment */ 352 int s_segshift; /* log2 of segment size */ 353 long s_segmask; /* 1 << s_segshift - 1 */ 354 long s_no_segs; /* segments on device */ 355 long s_no_journal_segs; /* segments used for journal */ 356 long s_no_blocks; /* blocks per segment */ 357 long s_writesize; /* minimum write size */ 358 int s_writeshift; /* log2 of write size */ 359 u64 s_size; /* filesystem size */ 360 struct logfs_area *s_area[LOGFS_NO_AREAS]; /* open segment array */ 361 u64 s_gec; /* global erase count */ 362 u64 s_wl_gec_ostore; /* time of last wl event */ 363 u64 s_wl_gec_journal; /* time of last wl event */ 364 u64 s_sweeper; /* current sweeper pos */ 365 u8 s_ifile_levels; /* max level of ifile */ 366 u8 s_iblock_levels; /* max level of regular files */ 367 u8 s_data_levels; /* # of segments to leaf block*/ 368 u8 s_total_levels; /* sum of above three */ 369 struct btree_head32 s_cand_tree; /* all candidates */ 370 struct candidate_list s_free_list; /* 100% free segments */ 371 struct candidate_list s_reserve_list; /* Bad segment reserve */ 372 struct candidate_list s_low_list[LOGFS_NO_AREAS];/* good candidates */ 373 struct candidate_list s_ec_list; /* wear level candidates */ 374 struct btree_head32 s_reserved_segments;/* sb, journal, bad, etc. */ 375 /* inode.c fields */ 376 u64 s_last_ino; /* highest ino used */ 377 long s_inos_till_wrap; 378 u32 s_generation; /* i_generation for new files */ 379 struct list_head s_freeing_list; /* inodes being freed */ 380 /* journal.c fields */ 381 struct mutex s_journal_mutex; 382 void *s_je; /* journal entry to compress */ 383 void *s_compressed_je; /* block to write to journal */ 384 u32 s_journal_seg[LOGFS_JOURNAL_SEGS]; /* journal segments */ 385 u32 s_journal_ec[LOGFS_JOURNAL_SEGS]; /* journal erasecounts */ 386 u64 s_last_version; 387 struct logfs_area *s_journal_area; /* open journal segment */ 388 __be64 s_je_array[MAX_JOURNAL_ENTRIES]; 389 int s_no_je; 390 391 int s_sum_index; /* for the 12 summaries */ 392 struct shadow_tree s_shadow_tree; 393 int s_je_fill; /* index of current je */ 394 /* readwrite.c fields */ 395 struct mutex s_write_mutex; 396 int s_lock_count; 397 mempool_t *s_block_pool; /* struct logfs_block pool */ 398 mempool_t *s_shadow_pool; /* struct logfs_shadow pool */ 399 struct list_head s_writeback_list; /* writeback pages */ 400 /* 401 * Space accounting: 402 * - s_used_bytes specifies space used to store valid data objects. 403 * - s_dirty_used_bytes is space used to store non-committed data 404 * objects. Those objects have already been written themselves, 405 * but they don't become valid until all indirect blocks up to the 406 * journal have been written as well. 407 * - s_dirty_free_bytes is space used to store the old copy of a 408 * replaced object, as long as the replacement is non-committed. 409 * In other words, it is the amount of space freed when all dirty 410 * blocks are written back. 411 * - s_free_bytes is the amount of free space available for any 412 * purpose. 413 * - s_root_reserve is the amount of free space available only to 414 * the root user. Non-privileged users can no longer write once 415 * this watermark has been reached. 416 * - s_speed_reserve is space which remains unused to speed up 417 * garbage collection performance. 418 * - s_dirty_pages is the space reserved for currently dirty pages. 419 * It is a pessimistic estimate, so some/most will get freed on 420 * page writeback. 421 * 422 * s_used_bytes + s_free_bytes + s_speed_reserve = total usable size 423 */ 424 u64 s_free_bytes; 425 u64 s_used_bytes; 426 u64 s_dirty_free_bytes; 427 u64 s_dirty_used_bytes; 428 u64 s_root_reserve; 429 u64 s_speed_reserve; 430 u64 s_dirty_pages; 431 /* Bad block handling: 432 * - s_bad_seg_reserve is a number of segments usually kept 433 * free. When encountering bad blocks, the affected segment's data 434 * is _temporarily_ moved to a reserved segment. 435 * - s_bad_segments is the number of known bad segments. 436 */ 437 u32 s_bad_seg_reserve; 438 u32 s_bad_segments; 439}; 440 441/** 442 * struct logfs_inode - in-memory inode 443 * 444 * @vfs_inode: struct inode 445 * @li_data: data pointers 446 * @li_used_bytes: number of used bytes 447 * @li_freeing_list: used to track inodes currently being freed 448 * @li_flags: inode flags 449 * @li_refcount: number of internal (GC-induced) references 450 */ 451struct logfs_inode { 452 struct inode vfs_inode; 453 u64 li_data[LOGFS_EMBEDDED_FIELDS]; 454 u64 li_used_bytes; 455 struct list_head li_freeing_list; 456 struct logfs_block *li_block; 457 u32 li_flags; 458 u8 li_height; 459 int li_refcount; 460}; 461 462#define journal_for_each(__i) for (__i = 0; __i < LOGFS_JOURNAL_SEGS; __i++) 463#define for_each_area(__i) for (__i = 0; __i < LOGFS_NO_AREAS; __i++) 464#define for_each_area_down(__i) for (__i = LOGFS_NO_AREAS - 1; __i >= 0; __i--) 465 466/* compr.c */ 467int logfs_compress(void *in, void *out, size_t inlen, size_t outlen); 468int logfs_uncompress(void *in, void *out, size_t inlen, size_t outlen); 469int __init logfs_compr_init(void); 470void logfs_compr_exit(void); 471 472/* dev_bdev.c */ 473#ifdef CONFIG_BLOCK 474int logfs_get_sb_bdev(struct logfs_super *s, 475 struct file_system_type *type, int flags, 476 const char *devname, struct vfsmount *mnt); 477#else 478static inline int logfs_get_sb_bdev(struct logfs_super *s, 479 struct file_system_type *type, int flags, 480 const char *devname, struct vfsmount *mnt) 481{ 482 kfree(s); 483 return -ENODEV; 484} 485#endif 486 487/* dev_mtd.c */ 488#ifdef CONFIG_MTD 489int logfs_get_sb_mtd(struct logfs_super *s, 490 struct file_system_type *type, int flags, 491 int mtdnr, struct vfsmount *mnt); 492#else 493static inline int logfs_get_sb_mtd(struct logfs_super *s, 494 struct file_system_type *type, int flags, 495 int mtdnr, struct vfsmount *mnt) 496{ 497 kfree(s); 498 return -ENODEV; 499} 500#endif 501 502/* dir.c */ 503extern const struct inode_operations logfs_symlink_iops; 504extern const struct inode_operations logfs_dir_iops; 505extern const struct file_operations logfs_dir_fops; 506int logfs_replay_journal(struct super_block *sb); 507 508/* file.c */ 509extern const struct inode_operations logfs_reg_iops; 510extern const struct file_operations logfs_reg_fops; 511extern const struct address_space_operations logfs_reg_aops; 512int logfs_readpage(struct file *file, struct page *page); 513long logfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 514int logfs_fsync(struct file *file, int datasync); 515 516/* gc.c */ 517u32 get_best_cand(struct super_block *sb, struct candidate_list *list, u32 *ec); 518void logfs_gc_pass(struct super_block *sb); 519int logfs_check_areas(struct super_block *sb); 520int logfs_init_gc(struct super_block *sb); 521void logfs_cleanup_gc(struct super_block *sb); 522 523/* inode.c */ 524extern const struct super_operations logfs_super_operations; 525struct inode *logfs_iget(struct super_block *sb, ino_t ino); 526struct inode *logfs_safe_iget(struct super_block *sb, ino_t ino, int *cookie); 527void logfs_safe_iput(struct inode *inode, int cookie); 528struct inode *logfs_new_inode(struct inode *dir, int mode); 529struct inode *logfs_new_meta_inode(struct super_block *sb, u64 ino); 530struct inode *logfs_read_meta_inode(struct super_block *sb, u64 ino); 531int logfs_init_inode_cache(void); 532void logfs_destroy_inode_cache(void); 533void logfs_set_blocks(struct inode *inode, u64 no); 534/* these logically belong into inode.c but actually reside in readwrite.c */ 535int logfs_read_inode(struct inode *inode); 536int __logfs_write_inode(struct inode *inode, long flags); 537void logfs_evict_inode(struct inode *inode); 538 539/* journal.c */ 540void logfs_write_anchor(struct super_block *sb); 541int logfs_init_journal(struct super_block *sb); 542void logfs_cleanup_journal(struct super_block *sb); 543int write_alias_journal(struct super_block *sb, u64 ino, u64 bix, 544 level_t level, int child_no, __be64 val); 545void do_logfs_journal_wl_pass(struct super_block *sb); 546 547/* readwrite.c */ 548pgoff_t logfs_pack_index(u64 bix, level_t level); 549void logfs_unpack_index(pgoff_t index, u64 *bix, level_t *level); 550int logfs_inode_write(struct inode *inode, const void *buf, size_t count, 551 loff_t bix, long flags, struct shadow_tree *shadow_tree); 552int logfs_readpage_nolock(struct page *page); 553int logfs_write_buf(struct inode *inode, struct page *page, long flags); 554int logfs_delete(struct inode *inode, pgoff_t index, 555 struct shadow_tree *shadow_tree); 556int logfs_rewrite_block(struct inode *inode, u64 bix, u64 ofs, 557 gc_level_t gc_level, long flags); 558int logfs_is_valid_block(struct super_block *sb, u64 ofs, u64 ino, u64 bix, 559 gc_level_t gc_level); 560int logfs_truncate(struct inode *inode, u64 size); 561u64 logfs_seek_hole(struct inode *inode, u64 bix); 562u64 logfs_seek_data(struct inode *inode, u64 bix); 563int logfs_open_segfile(struct super_block *sb); 564int logfs_init_rw(struct super_block *sb); 565void logfs_cleanup_rw(struct super_block *sb); 566void logfs_add_transaction(struct inode *inode, struct logfs_transaction *ta); 567void logfs_del_transaction(struct inode *inode, struct logfs_transaction *ta); 568void logfs_write_block(struct logfs_block *block, long flags); 569int logfs_write_obj_aliases_pagecache(struct super_block *sb); 570void logfs_get_segment_entry(struct super_block *sb, u32 segno, 571 struct logfs_segment_entry *se); 572void logfs_set_segment_used(struct super_block *sb, u64 ofs, int increment); 573void logfs_set_segment_erased(struct super_block *sb, u32 segno, u32 ec, 574 gc_level_t gc_level); 575void logfs_set_segment_reserved(struct super_block *sb, u32 segno); 576void logfs_set_segment_unreserved(struct super_block *sb, u32 segno, u32 ec); 577struct logfs_block *__alloc_block(struct super_block *sb, 578 u64 ino, u64 bix, level_t level); 579void __free_block(struct super_block *sb, struct logfs_block *block); 580void btree_write_block(struct logfs_block *block); 581void initialize_block_counters(struct page *page, struct logfs_block *block, 582 __be64 *array, int page_is_empty); 583int logfs_exist_block(struct inode *inode, u64 bix); 584int get_page_reserve(struct inode *inode, struct page *page); 585extern struct logfs_block_ops indirect_block_ops; 586 587/* segment.c */ 588int logfs_erase_segment(struct super_block *sb, u32 ofs, int ensure_erase); 589int wbuf_read(struct super_block *sb, u64 ofs, size_t len, void *buf); 590int logfs_segment_read(struct inode *inode, struct page *page, u64 ofs, u64 bix, 591 level_t level); 592int logfs_segment_write(struct inode *inode, struct page *page, 593 struct logfs_shadow *shadow); 594int logfs_segment_delete(struct inode *inode, struct logfs_shadow *shadow); 595int logfs_load_object_aliases(struct super_block *sb, 596 struct logfs_obj_alias *oa, int count); 597void move_page_to_btree(struct page *page); 598int logfs_init_mapping(struct super_block *sb); 599void logfs_sync_area(struct logfs_area *area); 600void logfs_sync_segments(struct super_block *sb); 601void freeseg(struct super_block *sb, u32 segno); 602 603/* area handling */ 604int logfs_init_areas(struct super_block *sb); 605void logfs_cleanup_areas(struct super_block *sb); 606int logfs_open_area(struct logfs_area *area, size_t bytes); 607int __logfs_buf_write(struct logfs_area *area, u64 ofs, void *buf, size_t len, 608 int use_filler); 609 610static inline int logfs_buf_write(struct logfs_area *area, u64 ofs, 611 void *buf, size_t len) 612{ 613 return __logfs_buf_write(area, ofs, buf, len, 0); 614} 615 616static inline int logfs_buf_recover(struct logfs_area *area, u64 ofs, 617 void *buf, size_t len) 618{ 619 return __logfs_buf_write(area, ofs, buf, len, 1); 620} 621 622/* super.c */ 623struct page *emergency_read_begin(struct address_space *mapping, pgoff_t index); 624void emergency_read_end(struct page *page); 625void logfs_crash_dump(struct super_block *sb); 626void *memchr_inv(const void *s, int c, size_t n); 627int logfs_statfs(struct dentry *dentry, struct kstatfs *stats); 628int logfs_get_sb_device(struct logfs_super *s, 629 struct file_system_type *type, int flags, 630 struct vfsmount *mnt); 631int logfs_check_ds(struct logfs_disk_super *ds); 632int logfs_write_sb(struct super_block *sb); 633 634static inline struct logfs_super *logfs_super(struct super_block *sb) 635{ 636 return sb->s_fs_info; 637} 638 639static inline struct logfs_inode *logfs_inode(struct inode *inode) 640{ 641 return container_of(inode, struct logfs_inode, vfs_inode); 642} 643 644static inline void logfs_set_ro(struct super_block *sb) 645{ 646 logfs_super(sb)->s_flags |= LOGFS_SB_FLAG_RO; 647} 648 649#define LOGFS_BUG(sb) do { \ 650 struct super_block *__sb = sb; \ 651 logfs_crash_dump(__sb); \ 652 logfs_super(__sb)->s_flags |= LOGFS_SB_FLAG_RO; \ 653 BUG(); \ 654} while (0) 655 656#define LOGFS_BUG_ON(condition, sb) \ 657 do { if (unlikely(condition)) LOGFS_BUG((sb)); } while (0) 658 659static inline __be32 logfs_crc32(void *data, size_t len, size_t skip) 660{ 661 return cpu_to_be32(crc32(~0, data+skip, len-skip)); 662} 663 664static inline u8 logfs_type(struct inode *inode) 665{ 666 return (inode->i_mode >> 12) & 15; 667} 668 669static inline pgoff_t logfs_index(struct super_block *sb, u64 pos) 670{ 671 return pos >> sb->s_blocksize_bits; 672} 673 674static inline u64 dev_ofs(struct super_block *sb, u32 segno, u32 ofs) 675{ 676 return ((u64)segno << logfs_super(sb)->s_segshift) + ofs; 677} 678 679static inline u32 seg_no(struct super_block *sb, u64 ofs) 680{ 681 return ofs >> logfs_super(sb)->s_segshift; 682} 683 684static inline u32 seg_ofs(struct super_block *sb, u64 ofs) 685{ 686 return ofs & logfs_super(sb)->s_segmask; 687} 688 689static inline u64 seg_align(struct super_block *sb, u64 ofs) 690{ 691 return ofs & ~logfs_super(sb)->s_segmask; 692} 693 694static inline struct logfs_block *logfs_block(struct page *page) 695{ 696 return (void *)page->private; 697} 698 699static inline level_t shrink_level(gc_level_t __level) 700{ 701 u8 level = (__force u8)__level; 702 703 if (level >= LOGFS_MAX_LEVELS) 704 level -= LOGFS_MAX_LEVELS; 705 return (__force level_t)level; 706} 707 708static inline gc_level_t expand_level(u64 ino, level_t __level) 709{ 710 u8 level = (__force u8)__level; 711 712 if (ino == LOGFS_INO_MASTER) { 713 /* ifile has separate areas */ 714 level += LOGFS_MAX_LEVELS; 715 } 716 return (__force gc_level_t)level; 717} 718 719static inline int logfs_block_shift(struct super_block *sb, level_t level) 720{ 721 level = shrink_level((__force gc_level_t)level); 722 return (__force int)level * (sb->s_blocksize_bits - 3); 723} 724 725static inline u64 logfs_block_mask(struct super_block *sb, level_t level) 726{ 727 return ~0ull << logfs_block_shift(sb, level); 728} 729 730static inline struct logfs_area *get_area(struct super_block *sb, 731 gc_level_t gc_level) 732{ 733 return logfs_super(sb)->s_area[(__force u8)gc_level]; 734} 735 736static inline void logfs_mempool_destroy(mempool_t *pool) 737{ 738 if (pool) 739 mempool_destroy(pool); 740} 741 742#endif 743