1 /* 2 * Copyright 1996, 1997, 1998 Hans Reiser, see reiserfs/README for licensing and copyright details 3 */ 4 5 #include <linux/reiserfs_fs.h> 6 7 #include <linux/slab.h> 8 #include <linux/interrupt.h> 9 #include <linux/sched.h> 10 #include <linux/bug.h> 11 #include <linux/workqueue.h> 12 #include <asm/unaligned.h> 13 #include <linux/bitops.h> 14 #include <linux/proc_fs.h> 15 #include <linux/buffer_head.h> 16 17 /* the 32 bit compat definitions with int argument */ 18 #define REISERFS_IOC32_UNPACK _IOW(0xCD, 1, int) 19 #define REISERFS_IOC32_GETFLAGS FS_IOC32_GETFLAGS 20 #define REISERFS_IOC32_SETFLAGS FS_IOC32_SETFLAGS 21 #define REISERFS_IOC32_GETVERSION FS_IOC32_GETVERSION 22 #define REISERFS_IOC32_SETVERSION FS_IOC32_SETVERSION 23 24 struct reiserfs_journal_list; 25 26 /** bitmasks for i_flags field in reiserfs-specific part of inode */ 27 typedef enum { 28 /** this says what format of key do all items (but stat data) of 29 an object have. If this is set, that format is 3.6 otherwise 30 - 3.5 */ 31 i_item_key_version_mask = 0x0001, 32 /** If this is unset, object has 3.5 stat data, otherwise, it has 33 3.6 stat data with 64bit size, 32bit nlink etc. */ 34 i_stat_data_version_mask = 0x0002, 35 /** file might need tail packing on close */ 36 i_pack_on_close_mask = 0x0004, 37 /** don't pack tail of file */ 38 i_nopack_mask = 0x0008, 39 /** If those is set, "safe link" was created for this file during 40 truncate or unlink. Safe link is used to avoid leakage of disk 41 space on crash with some files open, but unlinked. */ 42 i_link_saved_unlink_mask = 0x0010, 43 i_link_saved_truncate_mask = 0x0020, 44 i_has_xattr_dir = 0x0040, 45 i_data_log = 0x0080, 46 } reiserfs_inode_flags; 47 48 struct reiserfs_inode_info { 49 __u32 i_key[4]; /* key is still 4 32 bit integers */ 50 /** transient inode flags that are never stored on disk. Bitmasks 51 for this field are defined above. */ 52 __u32 i_flags; 53 54 __u32 i_first_direct_byte; // offset of first byte stored in direct item. 55 56 /* copy of persistent inode flags read from sd_attrs. */ 57 __u32 i_attrs; 58 59 int i_prealloc_block; /* first unused block of a sequence of unused blocks */ 60 int i_prealloc_count; /* length of that sequence */ 61 struct list_head i_prealloc_list; /* per-transaction list of inodes which 62 * have preallocated blocks */ 63 64 unsigned new_packing_locality:1; /* new_packig_locality is created; new blocks 65 * for the contents of this directory should be 66 * displaced */ 67 68 /* we use these for fsync or O_SYNC to decide which transaction 69 ** needs to be committed in order for this inode to be properly 70 ** flushed */ 71 unsigned int i_trans_id; 72 struct reiserfs_journal_list *i_jl; 73 atomic_t openers; 74 struct mutex tailpack; 75 #ifdef CONFIG_REISERFS_FS_XATTR 76 struct rw_semaphore i_xattr_sem; 77 #endif 78 struct inode vfs_inode; 79 }; 80 81 typedef enum { 82 reiserfs_attrs_cleared = 0x00000001, 83 } reiserfs_super_block_flags; 84 85 /* struct reiserfs_super_block accessors/mutators 86 * since this is a disk structure, it will always be in 87 * little endian format. */ 88 #define sb_block_count(sbp) (le32_to_cpu((sbp)->s_v1.s_block_count)) 89 #define set_sb_block_count(sbp,v) ((sbp)->s_v1.s_block_count = cpu_to_le32(v)) 90 #define sb_free_blocks(sbp) (le32_to_cpu((sbp)->s_v1.s_free_blocks)) 91 #define set_sb_free_blocks(sbp,v) ((sbp)->s_v1.s_free_blocks = cpu_to_le32(v)) 92 #define sb_root_block(sbp) (le32_to_cpu((sbp)->s_v1.s_root_block)) 93 #define set_sb_root_block(sbp,v) ((sbp)->s_v1.s_root_block = cpu_to_le32(v)) 94 95 #define sb_jp_journal_1st_block(sbp) \ 96 (le32_to_cpu((sbp)->s_v1.s_journal.jp_journal_1st_block)) 97 #define set_sb_jp_journal_1st_block(sbp,v) \ 98 ((sbp)->s_v1.s_journal.jp_journal_1st_block = cpu_to_le32(v)) 99 #define sb_jp_journal_dev(sbp) \ 100 (le32_to_cpu((sbp)->s_v1.s_journal.jp_journal_dev)) 101 #define set_sb_jp_journal_dev(sbp,v) \ 102 ((sbp)->s_v1.s_journal.jp_journal_dev = cpu_to_le32(v)) 103 #define sb_jp_journal_size(sbp) \ 104 (le32_to_cpu((sbp)->s_v1.s_journal.jp_journal_size)) 105 #define set_sb_jp_journal_size(sbp,v) \ 106 ((sbp)->s_v1.s_journal.jp_journal_size = cpu_to_le32(v)) 107 #define sb_jp_journal_trans_max(sbp) \ 108 (le32_to_cpu((sbp)->s_v1.s_journal.jp_journal_trans_max)) 109 #define set_sb_jp_journal_trans_max(sbp,v) \ 110 ((sbp)->s_v1.s_journal.jp_journal_trans_max = cpu_to_le32(v)) 111 #define sb_jp_journal_magic(sbp) \ 112 (le32_to_cpu((sbp)->s_v1.s_journal.jp_journal_magic)) 113 #define set_sb_jp_journal_magic(sbp,v) \ 114 ((sbp)->s_v1.s_journal.jp_journal_magic = cpu_to_le32(v)) 115 #define sb_jp_journal_max_batch(sbp) \ 116 (le32_to_cpu((sbp)->s_v1.s_journal.jp_journal_max_batch)) 117 #define set_sb_jp_journal_max_batch(sbp,v) \ 118 ((sbp)->s_v1.s_journal.jp_journal_max_batch = cpu_to_le32(v)) 119 #define sb_jp_jourmal_max_commit_age(sbp) \ 120 (le32_to_cpu((sbp)->s_v1.s_journal.jp_journal_max_commit_age)) 121 #define set_sb_jp_journal_max_commit_age(sbp,v) \ 122 ((sbp)->s_v1.s_journal.jp_journal_max_commit_age = cpu_to_le32(v)) 123 124 #define sb_blocksize(sbp) (le16_to_cpu((sbp)->s_v1.s_blocksize)) 125 #define set_sb_blocksize(sbp,v) ((sbp)->s_v1.s_blocksize = cpu_to_le16(v)) 126 #define sb_oid_maxsize(sbp) (le16_to_cpu((sbp)->s_v1.s_oid_maxsize)) 127 #define set_sb_oid_maxsize(sbp,v) ((sbp)->s_v1.s_oid_maxsize = cpu_to_le16(v)) 128 #define sb_oid_cursize(sbp) (le16_to_cpu((sbp)->s_v1.s_oid_cursize)) 129 #define set_sb_oid_cursize(sbp,v) ((sbp)->s_v1.s_oid_cursize = cpu_to_le16(v)) 130 #define sb_umount_state(sbp) (le16_to_cpu((sbp)->s_v1.s_umount_state)) 131 #define set_sb_umount_state(sbp,v) ((sbp)->s_v1.s_umount_state = cpu_to_le16(v)) 132 #define sb_fs_state(sbp) (le16_to_cpu((sbp)->s_v1.s_fs_state)) 133 #define set_sb_fs_state(sbp,v) ((sbp)->s_v1.s_fs_state = cpu_to_le16(v)) 134 #define sb_hash_function_code(sbp) \ 135 (le32_to_cpu((sbp)->s_v1.s_hash_function_code)) 136 #define set_sb_hash_function_code(sbp,v) \ 137 ((sbp)->s_v1.s_hash_function_code = cpu_to_le32(v)) 138 #define sb_tree_height(sbp) (le16_to_cpu((sbp)->s_v1.s_tree_height)) 139 #define set_sb_tree_height(sbp,v) ((sbp)->s_v1.s_tree_height = cpu_to_le16(v)) 140 #define sb_bmap_nr(sbp) (le16_to_cpu((sbp)->s_v1.s_bmap_nr)) 141 #define set_sb_bmap_nr(sbp,v) ((sbp)->s_v1.s_bmap_nr = cpu_to_le16(v)) 142 #define sb_version(sbp) (le16_to_cpu((sbp)->s_v1.s_version)) 143 #define set_sb_version(sbp,v) ((sbp)->s_v1.s_version = cpu_to_le16(v)) 144 145 #define sb_mnt_count(sbp) (le16_to_cpu((sbp)->s_mnt_count)) 146 #define set_sb_mnt_count(sbp, v) ((sbp)->s_mnt_count = cpu_to_le16(v)) 147 148 #define sb_reserved_for_journal(sbp) \ 149 (le16_to_cpu((sbp)->s_v1.s_reserved_for_journal)) 150 #define set_sb_reserved_for_journal(sbp,v) \ 151 ((sbp)->s_v1.s_reserved_for_journal = cpu_to_le16(v)) 152 153 /* LOGGING -- */ 154 155 /* These all interelate for performance. 156 ** 157 ** If the journal block count is smaller than n transactions, you lose speed. 158 ** I don't know what n is yet, I'm guessing 8-16. 159 ** 160 ** typical transaction size depends on the application, how often fsync is 161 ** called, and how many metadata blocks you dirty in a 30 second period. 162 ** The more small files (<16k) you use, the larger your transactions will 163 ** be. 164 ** 165 ** If your journal fills faster than dirty buffers get flushed to disk, it must flush them before allowing the journal 166 ** to wrap, which slows things down. If you need high speed meta data updates, the journal should be big enough 167 ** to prevent wrapping before dirty meta blocks get to disk. 168 ** 169 ** If the batch max is smaller than the transaction max, you'll waste space at the end of the journal 170 ** because journal_end sets the next transaction to start at 0 if the next transaction has any chance of wrapping. 171 ** 172 ** The large the batch max age, the better the speed, and the more meta data changes you'll lose after a crash. 173 ** 174 */ 175 176 /* don't mess with these for a while */ 177 /* we have a node size define somewhere in reiserfs_fs.h. -Hans */ 178 #define JOURNAL_BLOCK_SIZE 4096 /* BUG gotta get rid of this */ 179 #define JOURNAL_MAX_CNODE 1500 /* max cnodes to allocate. */ 180 #define JOURNAL_HASH_SIZE 8192 181 #define JOURNAL_NUM_BITMAPS 5 /* number of copies of the bitmaps to have floating. Must be >= 2 */ 182 183 /* One of these for every block in every transaction 184 ** Each one is in two hash tables. First, a hash of the current transaction, and after journal_end, a 185 ** hash of all the in memory transactions. 186 ** next and prev are used by the current transaction (journal_hash). 187 ** hnext and hprev are used by journal_list_hash. If a block is in more than one transaction, the journal_list_hash 188 ** links it in multiple times. This allows flush_journal_list to remove just the cnode belonging 189 ** to a given transaction. 190 */ 191 struct reiserfs_journal_cnode { 192 struct buffer_head *bh; /* real buffer head */ 193 struct super_block *sb; /* dev of real buffer head */ 194 __u32 blocknr; /* block number of real buffer head, == 0 when buffer on disk */ 195 unsigned long state; 196 struct reiserfs_journal_list *jlist; /* journal list this cnode lives in */ 197 struct reiserfs_journal_cnode *next; /* next in transaction list */ 198 struct reiserfs_journal_cnode *prev; /* prev in transaction list */ 199 struct reiserfs_journal_cnode *hprev; /* prev in hash list */ 200 struct reiserfs_journal_cnode *hnext; /* next in hash list */ 201 }; 202 203 struct reiserfs_bitmap_node { 204 int id; 205 char *data; 206 struct list_head list; 207 }; 208 209 struct reiserfs_list_bitmap { 210 struct reiserfs_journal_list *journal_list; 211 struct reiserfs_bitmap_node **bitmaps; 212 }; 213 214 /* 215 ** one of these for each transaction. The most important part here is the j_realblock. 216 ** this list of cnodes is used to hash all the blocks in all the commits, to mark all the 217 ** real buffer heads dirty once all the commits hit the disk, 218 ** and to make sure every real block in a transaction is on disk before allowing the log area 219 ** to be overwritten */ 220 struct reiserfs_journal_list { 221 unsigned long j_start; 222 unsigned long j_state; 223 unsigned long j_len; 224 atomic_t j_nonzerolen; 225 atomic_t j_commit_left; 226 atomic_t j_older_commits_done; /* all commits older than this on disk */ 227 struct mutex j_commit_mutex; 228 unsigned int j_trans_id; 229 time_t j_timestamp; 230 struct reiserfs_list_bitmap *j_list_bitmap; 231 struct buffer_head *j_commit_bh; /* commit buffer head */ 232 struct reiserfs_journal_cnode *j_realblock; 233 struct reiserfs_journal_cnode *j_freedlist; /* list of buffers that were freed during this trans. free each of these on flush */ 234 /* time ordered list of all active transactions */ 235 struct list_head j_list; 236 237 /* time ordered list of all transactions we haven't tried to flush yet */ 238 struct list_head j_working_list; 239 240 /* list of tail conversion targets in need of flush before commit */ 241 struct list_head j_tail_bh_list; 242 /* list of data=ordered buffers in need of flush before commit */ 243 struct list_head j_bh_list; 244 int j_refcount; 245 }; 246 247 struct reiserfs_journal { 248 struct buffer_head **j_ap_blocks; /* journal blocks on disk */ 249 struct reiserfs_journal_cnode *j_last; /* newest journal block */ 250 struct reiserfs_journal_cnode *j_first; /* oldest journal block. start here for traverse */ 251 252 struct block_device *j_dev_bd; 253 fmode_t j_dev_mode; 254 int j_1st_reserved_block; /* first block on s_dev of reserved area journal */ 255 256 unsigned long j_state; 257 unsigned int j_trans_id; 258 unsigned long j_mount_id; 259 unsigned long j_start; /* start of current waiting commit (index into j_ap_blocks) */ 260 unsigned long j_len; /* length of current waiting commit */ 261 unsigned long j_len_alloc; /* number of buffers requested by journal_begin() */ 262 atomic_t j_wcount; /* count of writers for current commit */ 263 unsigned long j_bcount; /* batch count. allows turning X transactions into 1 */ 264 unsigned long j_first_unflushed_offset; /* first unflushed transactions offset */ 265 unsigned j_last_flush_trans_id; /* last fully flushed journal timestamp */ 266 struct buffer_head *j_header_bh; 267 268 time_t j_trans_start_time; /* time this transaction started */ 269 struct mutex j_mutex; 270 struct mutex j_flush_mutex; 271 wait_queue_head_t j_join_wait; /* wait for current transaction to finish before starting new one */ 272 atomic_t j_jlock; /* lock for j_join_wait */ 273 int j_list_bitmap_index; /* number of next list bitmap to use */ 274 int j_must_wait; /* no more journal begins allowed. MUST sleep on j_join_wait */ 275 int j_next_full_flush; /* next journal_end will flush all journal list */ 276 int j_next_async_flush; /* next journal_end will flush all async commits */ 277 278 int j_cnode_used; /* number of cnodes on the used list */ 279 int j_cnode_free; /* number of cnodes on the free list */ 280 281 unsigned int j_trans_max; /* max number of blocks in a transaction. */ 282 unsigned int j_max_batch; /* max number of blocks to batch into a trans */ 283 unsigned int j_max_commit_age; /* in seconds, how old can an async commit be */ 284 unsigned int j_max_trans_age; /* in seconds, how old can a transaction be */ 285 unsigned int j_default_max_commit_age; /* the default for the max commit age */ 286 287 struct reiserfs_journal_cnode *j_cnode_free_list; 288 struct reiserfs_journal_cnode *j_cnode_free_orig; /* orig pointer returned from vmalloc */ 289 290 struct reiserfs_journal_list *j_current_jl; 291 int j_free_bitmap_nodes; 292 int j_used_bitmap_nodes; 293 294 int j_num_lists; /* total number of active transactions */ 295 int j_num_work_lists; /* number that need attention from kreiserfsd */ 296 297 /* debugging to make sure things are flushed in order */ 298 unsigned int j_last_flush_id; 299 300 /* debugging to make sure things are committed in order */ 301 unsigned int j_last_commit_id; 302 303 struct list_head j_bitmap_nodes; 304 struct list_head j_dirty_buffers; 305 spinlock_t j_dirty_buffers_lock; /* protects j_dirty_buffers */ 306 307 /* list of all active transactions */ 308 struct list_head j_journal_list; 309 /* lists that haven't been touched by writeback attempts */ 310 struct list_head j_working_list; 311 312 struct reiserfs_list_bitmap j_list_bitmap[JOURNAL_NUM_BITMAPS]; /* array of bitmaps to record the deleted blocks */ 313 struct reiserfs_journal_cnode *j_hash_table[JOURNAL_HASH_SIZE]; /* hash table for real buffer heads in current trans */ 314 struct reiserfs_journal_cnode *j_list_hash_table[JOURNAL_HASH_SIZE]; /* hash table for all the real buffer heads in all 315 the transactions */ 316 struct list_head j_prealloc_list; /* list of inodes which have preallocated blocks */ 317 int j_persistent_trans; 318 unsigned long j_max_trans_size; 319 unsigned long j_max_batch_size; 320 321 int j_errno; 322 323 /* when flushing ordered buffers, throttle new ordered writers */ 324 struct delayed_work j_work; 325 struct super_block *j_work_sb; 326 atomic_t j_async_throttle; 327 }; 328 329 enum journal_state_bits { 330 J_WRITERS_BLOCKED = 1, /* set when new writers not allowed */ 331 J_WRITERS_QUEUED, /* set when log is full due to too many writers */ 332 J_ABORTED, /* set when log is aborted */ 333 }; 334 335 #define JOURNAL_DESC_MAGIC "ReIsErLB" /* ick. magic string to find desc blocks in the journal */ 336 337 typedef __u32(*hashf_t) (const signed char *, int); 338 339 struct reiserfs_bitmap_info { 340 __u32 free_count; 341 }; 342 343 struct proc_dir_entry; 344 345 #if defined( CONFIG_PROC_FS ) && defined( CONFIG_REISERFS_PROC_INFO ) 346 typedef unsigned long int stat_cnt_t; 347 typedef struct reiserfs_proc_info_data { 348 spinlock_t lock; 349 int exiting; 350 int max_hash_collisions; 351 352 stat_cnt_t breads; 353 stat_cnt_t bread_miss; 354 stat_cnt_t search_by_key; 355 stat_cnt_t search_by_key_fs_changed; 356 stat_cnt_t search_by_key_restarted; 357 358 stat_cnt_t insert_item_restarted; 359 stat_cnt_t paste_into_item_restarted; 360 stat_cnt_t cut_from_item_restarted; 361 stat_cnt_t delete_solid_item_restarted; 362 stat_cnt_t delete_item_restarted; 363 364 stat_cnt_t leaked_oid; 365 stat_cnt_t leaves_removable; 366 367 /* balances per level. Use explicit 5 as MAX_HEIGHT is not visible yet. */ 368 stat_cnt_t balance_at[5]; /* XXX */ 369 /* sbk == search_by_key */ 370 stat_cnt_t sbk_read_at[5]; /* XXX */ 371 stat_cnt_t sbk_fs_changed[5]; 372 stat_cnt_t sbk_restarted[5]; 373 stat_cnt_t items_at[5]; /* XXX */ 374 stat_cnt_t free_at[5]; /* XXX */ 375 stat_cnt_t can_node_be_removed[5]; /* XXX */ 376 long int lnum[5]; /* XXX */ 377 long int rnum[5]; /* XXX */ 378 long int lbytes[5]; /* XXX */ 379 long int rbytes[5]; /* XXX */ 380 stat_cnt_t get_neighbors[5]; 381 stat_cnt_t get_neighbors_restart[5]; 382 stat_cnt_t need_l_neighbor[5]; 383 stat_cnt_t need_r_neighbor[5]; 384 385 stat_cnt_t free_block; 386 struct __scan_bitmap_stats { 387 stat_cnt_t call; 388 stat_cnt_t wait; 389 stat_cnt_t bmap; 390 stat_cnt_t retry; 391 stat_cnt_t in_journal_hint; 392 stat_cnt_t in_journal_nohint; 393 stat_cnt_t stolen; 394 } scan_bitmap; 395 struct __journal_stats { 396 stat_cnt_t in_journal; 397 stat_cnt_t in_journal_bitmap; 398 stat_cnt_t in_journal_reusable; 399 stat_cnt_t lock_journal; 400 stat_cnt_t lock_journal_wait; 401 stat_cnt_t journal_being; 402 stat_cnt_t journal_relock_writers; 403 stat_cnt_t journal_relock_wcount; 404 stat_cnt_t mark_dirty; 405 stat_cnt_t mark_dirty_already; 406 stat_cnt_t mark_dirty_notjournal; 407 stat_cnt_t restore_prepared; 408 stat_cnt_t prepare; 409 stat_cnt_t prepare_retry; 410 } journal; 411 } reiserfs_proc_info_data_t; 412 #else 413 typedef struct reiserfs_proc_info_data { 414 } reiserfs_proc_info_data_t; 415 #endif 416 417 /* reiserfs union of in-core super block data */ 418 struct reiserfs_sb_info { 419 struct buffer_head *s_sbh; /* Buffer containing the super block */ 420 /* both the comment and the choice of 421 name are unclear for s_rs -Hans */ 422 struct reiserfs_super_block *s_rs; /* Pointer to the super block in the buffer */ 423 struct reiserfs_bitmap_info *s_ap_bitmap; 424 struct reiserfs_journal *s_journal; /* pointer to journal information */ 425 unsigned short s_mount_state; /* reiserfs state (valid, invalid) */ 426 427 /* Serialize writers access, replace the old bkl */ 428 struct mutex lock; 429 /* Owner of the lock (can be recursive) */ 430 struct task_struct *lock_owner; 431 /* Depth of the lock, start from -1 like the bkl */ 432 int lock_depth; 433 434 /* Comment? -Hans */ 435 void (*end_io_handler) (struct buffer_head *, int); 436 hashf_t s_hash_function; /* pointer to function which is used 437 to sort names in directory. Set on 438 mount */ 439 unsigned long s_mount_opt; /* reiserfs's mount options are set 440 here (currently - NOTAIL, NOLOG, 441 REPLAYONLY) */ 442 443 struct { /* This is a structure that describes block allocator options */ 444 unsigned long bits; /* Bitfield for enable/disable kind of options */ 445 unsigned long large_file_size; /* size started from which we consider file to be a large one(in blocks) */ 446 int border; /* percentage of disk, border takes */ 447 int preallocmin; /* Minimal file size (in blocks) starting from which we do preallocations */ 448 int preallocsize; /* Number of blocks we try to prealloc when file 449 reaches preallocmin size (in blocks) or 450 prealloc_list is empty. */ 451 } s_alloc_options; 452 453 /* Comment? -Hans */ 454 wait_queue_head_t s_wait; 455 /* To be obsoleted soon by per buffer seals.. -Hans */ 456 atomic_t s_generation_counter; // increased by one every time the 457 // tree gets re-balanced 458 unsigned long s_properties; /* File system properties. Currently holds 459 on-disk FS format */ 460 461 /* session statistics */ 462 int s_disk_reads; 463 int s_disk_writes; 464 int s_fix_nodes; 465 int s_do_balance; 466 int s_unneeded_left_neighbor; 467 int s_good_search_by_key_reada; 468 int s_bmaps; 469 int s_bmaps_without_search; 470 int s_direct2indirect; 471 int s_indirect2direct; 472 /* set up when it's ok for reiserfs_read_inode2() to read from 473 disk inode with nlink==0. Currently this is only used during 474 finish_unfinished() processing at mount time */ 475 int s_is_unlinked_ok; 476 reiserfs_proc_info_data_t s_proc_info_data; 477 struct proc_dir_entry *procdir; 478 int reserved_blocks; /* amount of blocks reserved for further allocations */ 479 spinlock_t bitmap_lock; /* this lock on now only used to protect reserved_blocks variable */ 480 struct dentry *priv_root; /* root of /.reiserfs_priv */ 481 struct dentry *xattr_root; /* root of /.reiserfs_priv/xattrs */ 482 int j_errno; 483 484 int work_queued; /* non-zero delayed work is queued */ 485 struct delayed_work old_work; /* old transactions flush delayed work */ 486 spinlock_t old_work_lock; /* protects old_work and work_queued */ 487 488 #ifdef CONFIG_QUOTA 489 char *s_qf_names[MAXQUOTAS]; 490 int s_jquota_fmt; 491 #endif 492 char *s_jdev; /* Stored jdev for mount option showing */ 493 #ifdef CONFIG_REISERFS_CHECK 494 495 struct tree_balance *cur_tb; /* 496 * Detects whether more than one 497 * copy of tb exists per superblock 498 * as a means of checking whether 499 * do_balance is executing concurrently 500 * against another tree reader/writer 501 * on a same mount point. 502 */ 503 #endif 504 }; 505 506 /* Definitions of reiserfs on-disk properties: */ 507 #define REISERFS_3_5 0 508 #define REISERFS_3_6 1 509 #define REISERFS_OLD_FORMAT 2 510 511 enum reiserfs_mount_options { 512 /* Mount options */ 513 REISERFS_LARGETAIL, /* large tails will be created in a session */ 514 REISERFS_SMALLTAIL, /* small (for files less than block size) tails will be created in a session */ 515 REPLAYONLY, /* replay journal and return 0. Use by fsck */ 516 REISERFS_CONVERT, /* -o conv: causes conversion of old 517 format super block to the new 518 format. If not specified - old 519 partition will be dealt with in a 520 manner of 3.5.x */ 521 522 /* -o hash={tea, rupasov, r5, detect} is meant for properly mounting 523 ** reiserfs disks from 3.5.19 or earlier. 99% of the time, this option 524 ** is not required. If the normal autodection code can't determine which 525 ** hash to use (because both hashes had the same value for a file) 526 ** use this option to force a specific hash. It won't allow you to override 527 ** the existing hash on the FS, so if you have a tea hash disk, and mount 528 ** with -o hash=rupasov, the mount will fail. 529 */ 530 FORCE_TEA_HASH, /* try to force tea hash on mount */ 531 FORCE_RUPASOV_HASH, /* try to force rupasov hash on mount */ 532 FORCE_R5_HASH, /* try to force rupasov hash on mount */ 533 FORCE_HASH_DETECT, /* try to detect hash function on mount */ 534 535 REISERFS_DATA_LOG, 536 REISERFS_DATA_ORDERED, 537 REISERFS_DATA_WRITEBACK, 538 539 /* used for testing experimental features, makes benchmarking new 540 features with and without more convenient, should never be used by 541 users in any code shipped to users (ideally) */ 542 543 REISERFS_NO_BORDER, 544 REISERFS_NO_UNHASHED_RELOCATION, 545 REISERFS_HASHED_RELOCATION, 546 REISERFS_ATTRS, 547 REISERFS_XATTRS_USER, 548 REISERFS_POSIXACL, 549 REISERFS_EXPOSE_PRIVROOT, 550 REISERFS_BARRIER_NONE, 551 REISERFS_BARRIER_FLUSH, 552 553 /* Actions on error */ 554 REISERFS_ERROR_PANIC, 555 REISERFS_ERROR_RO, 556 REISERFS_ERROR_CONTINUE, 557 558 REISERFS_USRQUOTA, /* User quota option specified */ 559 REISERFS_GRPQUOTA, /* Group quota option specified */ 560 561 REISERFS_TEST1, 562 REISERFS_TEST2, 563 REISERFS_TEST3, 564 REISERFS_TEST4, 565 REISERFS_UNSUPPORTED_OPT, 566 }; 567 568 #define reiserfs_r5_hash(s) (REISERFS_SB(s)->s_mount_opt & (1 << FORCE_R5_HASH)) 569 #define reiserfs_rupasov_hash(s) (REISERFS_SB(s)->s_mount_opt & (1 << FORCE_RUPASOV_HASH)) 570 #define reiserfs_tea_hash(s) (REISERFS_SB(s)->s_mount_opt & (1 << FORCE_TEA_HASH)) 571 #define reiserfs_hash_detect(s) (REISERFS_SB(s)->s_mount_opt & (1 << FORCE_HASH_DETECT)) 572 #define reiserfs_no_border(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_NO_BORDER)) 573 #define reiserfs_no_unhashed_relocation(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_NO_UNHASHED_RELOCATION)) 574 #define reiserfs_hashed_relocation(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_HASHED_RELOCATION)) 575 #define reiserfs_test4(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_TEST4)) 576 577 #define have_large_tails(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_LARGETAIL)) 578 #define have_small_tails(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_SMALLTAIL)) 579 #define replay_only(s) (REISERFS_SB(s)->s_mount_opt & (1 << REPLAYONLY)) 580 #define reiserfs_attrs(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_ATTRS)) 581 #define old_format_only(s) (REISERFS_SB(s)->s_properties & (1 << REISERFS_3_5)) 582 #define convert_reiserfs(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_CONVERT)) 583 #define reiserfs_data_log(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_LOG)) 584 #define reiserfs_data_ordered(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_ORDERED)) 585 #define reiserfs_data_writeback(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_WRITEBACK)) 586 #define reiserfs_xattrs_user(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_XATTRS_USER)) 587 #define reiserfs_posixacl(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_POSIXACL)) 588 #define reiserfs_expose_privroot(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_EXPOSE_PRIVROOT)) 589 #define reiserfs_xattrs_optional(s) (reiserfs_xattrs_user(s) || reiserfs_posixacl(s)) 590 #define reiserfs_barrier_none(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_BARRIER_NONE)) 591 #define reiserfs_barrier_flush(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_BARRIER_FLUSH)) 592 593 #define reiserfs_error_panic(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_ERROR_PANIC)) 594 #define reiserfs_error_ro(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_ERROR_RO)) 595 596 void reiserfs_file_buffer(struct buffer_head *bh, int list); 597 extern struct file_system_type reiserfs_fs_type; 598 int reiserfs_resize(struct super_block *, unsigned long); 599 600 #define CARRY_ON 0 601 #define SCHEDULE_OCCURRED 1 602 603 #define SB_BUFFER_WITH_SB(s) (REISERFS_SB(s)->s_sbh) 604 #define SB_JOURNAL(s) (REISERFS_SB(s)->s_journal) 605 #define SB_JOURNAL_1st_RESERVED_BLOCK(s) (SB_JOURNAL(s)->j_1st_reserved_block) 606 #define SB_JOURNAL_LEN_FREE(s) (SB_JOURNAL(s)->j_journal_len_free) 607 #define SB_AP_BITMAP(s) (REISERFS_SB(s)->s_ap_bitmap) 608 609 #define SB_DISK_JOURNAL_HEAD(s) (SB_JOURNAL(s)->j_header_bh->) 610 611 /* A safe version of the "bdevname", which returns the "s_id" field of 612 * a superblock or else "Null superblock" if the super block is NULL. 613 */ 614 static inline char *reiserfs_bdevname(struct super_block *s) 615 { 616 return (s == NULL) ? "Null superblock" : s->s_id; 617 } 618 619 #define reiserfs_is_journal_aborted(journal) (unlikely (__reiserfs_is_journal_aborted (journal))) 620 static inline int __reiserfs_is_journal_aborted(struct reiserfs_journal 621 *journal) 622 { 623 return test_bit(J_ABORTED, &journal->j_state); 624 } 625 626 /* 627 * Locking primitives. The write lock is a per superblock 628 * special mutex that has properties close to the Big Kernel Lock 629 * which was used in the previous locking scheme. 630 */ 631 void reiserfs_write_lock(struct super_block *s); 632 void reiserfs_write_unlock(struct super_block *s); 633 int reiserfs_write_lock_once(struct super_block *s); 634 void reiserfs_write_unlock_once(struct super_block *s, int lock_depth); 635 636 #ifdef CONFIG_REISERFS_CHECK 637 void reiserfs_lock_check_recursive(struct super_block *s); 638 #else 639 static inline void reiserfs_lock_check_recursive(struct super_block *s) { } 640 #endif 641 642 /* 643 * Several mutexes depend on the write lock. 644 * However sometimes we want to relax the write lock while we hold 645 * these mutexes, according to the release/reacquire on schedule() 646 * properties of the Bkl that were used. 647 * Reiserfs performances and locking were based on this scheme. 648 * Now that the write lock is a mutex and not the bkl anymore, doing so 649 * may result in a deadlock: 650 * 651 * A acquire write_lock 652 * A acquire j_commit_mutex 653 * A release write_lock and wait for something 654 * B acquire write_lock 655 * B can't acquire j_commit_mutex and sleep 656 * A can't acquire write lock anymore 657 * deadlock 658 * 659 * What we do here is avoiding such deadlock by playing the same game 660 * than the Bkl: if we can't acquire a mutex that depends on the write lock, 661 * we release the write lock, wait a bit and then retry. 662 * 663 * The mutexes concerned by this hack are: 664 * - The commit mutex of a journal list 665 * - The flush mutex 666 * - The journal lock 667 * - The inode mutex 668 */ 669 static inline void reiserfs_mutex_lock_safe(struct mutex *m, 670 struct super_block *s) 671 { 672 reiserfs_lock_check_recursive(s); 673 reiserfs_write_unlock(s); 674 mutex_lock(m); 675 reiserfs_write_lock(s); 676 } 677 678 static inline void 679 reiserfs_mutex_lock_nested_safe(struct mutex *m, unsigned int subclass, 680 struct super_block *s) 681 { 682 reiserfs_lock_check_recursive(s); 683 reiserfs_write_unlock(s); 684 mutex_lock_nested(m, subclass); 685 reiserfs_write_lock(s); 686 } 687 688 static inline void 689 reiserfs_down_read_safe(struct rw_semaphore *sem, struct super_block *s) 690 { 691 reiserfs_lock_check_recursive(s); 692 reiserfs_write_unlock(s); 693 down_read(sem); 694 reiserfs_write_lock(s); 695 } 696 697 /* 698 * When we schedule, we usually want to also release the write lock, 699 * according to the previous bkl based locking scheme of reiserfs. 700 */ 701 static inline void reiserfs_cond_resched(struct super_block *s) 702 { 703 if (need_resched()) { 704 reiserfs_write_unlock(s); 705 schedule(); 706 reiserfs_write_lock(s); 707 } 708 } 709 710 struct fid; 711 712 /* in reading the #defines, it may help to understand that they employ 713 the following abbreviations: 714 715 B = Buffer 716 I = Item header 717 H = Height within the tree (should be changed to LEV) 718 N = Number of the item in the node 719 STAT = stat data 720 DEH = Directory Entry Header 721 EC = Entry Count 722 E = Entry number 723 UL = Unsigned Long 724 BLKH = BLocK Header 725 UNFM = UNForMatted node 726 DC = Disk Child 727 P = Path 728 729 These #defines are named by concatenating these abbreviations, 730 where first comes the arguments, and last comes the return value, 731 of the macro. 732 733 */ 734 735 #define USE_INODE_GENERATION_COUNTER 736 737 #define REISERFS_PREALLOCATE 738 #define DISPLACE_NEW_PACKING_LOCALITIES 739 #define PREALLOCATION_SIZE 9 740 741 /* n must be power of 2 */ 742 #define _ROUND_UP(x,n) (((x)+(n)-1u) & ~((n)-1u)) 743 744 // to be ok for alpha and others we have to align structures to 8 byte 745 // boundary. 746 // FIXME: do not change 4 by anything else: there is code which relies on that 747 #define ROUND_UP(x) _ROUND_UP(x,8LL) 748 749 /* debug levels. Right now, CONFIG_REISERFS_CHECK means print all debug 750 ** messages. 751 */ 752 #define REISERFS_DEBUG_CODE 5 /* extra messages to help find/debug errors */ 753 754 void __reiserfs_warning(struct super_block *s, const char *id, 755 const char *func, const char *fmt, ...); 756 #define reiserfs_warning(s, id, fmt, args...) \ 757 __reiserfs_warning(s, id, __func__, fmt, ##args) 758 /* assertions handling */ 759 760 /** always check a condition and panic if it's false. */ 761 #define __RASSERT(cond, scond, format, args...) \ 762 do { \ 763 if (!(cond)) \ 764 reiserfs_panic(NULL, "assertion failure", "(" #cond ") at " \ 765 __FILE__ ":%i:%s: " format "\n", \ 766 in_interrupt() ? -1 : task_pid_nr(current), \ 767 __LINE__, __func__ , ##args); \ 768 } while (0) 769 770 #define RASSERT(cond, format, args...) __RASSERT(cond, #cond, format, ##args) 771 772 #if defined( CONFIG_REISERFS_CHECK ) 773 #define RFALSE(cond, format, args...) __RASSERT(!(cond), "!(" #cond ")", format, ##args) 774 #else 775 #define RFALSE( cond, format, args... ) do {;} while( 0 ) 776 #endif 777 778 #define CONSTF __attribute_const__ 779 /* 780 * Disk Data Structures 781 */ 782 783 /***************************************************************************/ 784 /* SUPER BLOCK */ 785 /***************************************************************************/ 786 787 /* 788 * Structure of super block on disk, a version of which in RAM is often accessed as REISERFS_SB(s)->s_rs 789 * the version in RAM is part of a larger structure containing fields never written to disk. 790 */ 791 #define UNSET_HASH 0 // read_super will guess about, what hash names 792 // in directories were sorted with 793 #define TEA_HASH 1 794 #define YURA_HASH 2 795 #define R5_HASH 3 796 #define DEFAULT_HASH R5_HASH 797 798 struct journal_params { 799 __le32 jp_journal_1st_block; /* where does journal start from on its 800 * device */ 801 __le32 jp_journal_dev; /* journal device st_rdev */ 802 __le32 jp_journal_size; /* size of the journal */ 803 __le32 jp_journal_trans_max; /* max number of blocks in a transaction. */ 804 __le32 jp_journal_magic; /* random value made on fs creation (this 805 * was sb_journal_block_count) */ 806 __le32 jp_journal_max_batch; /* max number of blocks to batch into a 807 * trans */ 808 __le32 jp_journal_max_commit_age; /* in seconds, how old can an async 809 * commit be */ 810 __le32 jp_journal_max_trans_age; /* in seconds, how old can a transaction 811 * be */ 812 }; 813 814 /* this is the super from 3.5.X, where X >= 10 */ 815 struct reiserfs_super_block_v1 { 816 __le32 s_block_count; /* blocks count */ 817 __le32 s_free_blocks; /* free blocks count */ 818 __le32 s_root_block; /* root block number */ 819 struct journal_params s_journal; 820 __le16 s_blocksize; /* block size */ 821 __le16 s_oid_maxsize; /* max size of object id array, see 822 * get_objectid() commentary */ 823 __le16 s_oid_cursize; /* current size of object id array */ 824 __le16 s_umount_state; /* this is set to 1 when filesystem was 825 * umounted, to 2 - when not */ 826 char s_magic[10]; /* reiserfs magic string indicates that 827 * file system is reiserfs: 828 * "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" */ 829 __le16 s_fs_state; /* it is set to used by fsck to mark which 830 * phase of rebuilding is done */ 831 __le32 s_hash_function_code; /* indicate, what hash function is being use 832 * to sort names in a directory*/ 833 __le16 s_tree_height; /* height of disk tree */ 834 __le16 s_bmap_nr; /* amount of bitmap blocks needed to address 835 * each block of file system */ 836 __le16 s_version; /* this field is only reliable on filesystem 837 * with non-standard journal */ 838 __le16 s_reserved_for_journal; /* size in blocks of journal area on main 839 * device, we need to keep after 840 * making fs with non-standard journal */ 841 } __attribute__ ((__packed__)); 842 843 #define SB_SIZE_V1 (sizeof(struct reiserfs_super_block_v1)) 844 845 /* this is the on disk super block */ 846 struct reiserfs_super_block { 847 struct reiserfs_super_block_v1 s_v1; 848 __le32 s_inode_generation; 849 __le32 s_flags; /* Right now used only by inode-attributes, if enabled */ 850 unsigned char s_uuid[16]; /* filesystem unique identifier */ 851 unsigned char s_label[16]; /* filesystem volume label */ 852 __le16 s_mnt_count; /* Count of mounts since last fsck */ 853 __le16 s_max_mnt_count; /* Maximum mounts before check */ 854 __le32 s_lastcheck; /* Timestamp of last fsck */ 855 __le32 s_check_interval; /* Interval between checks */ 856 char s_unused[76]; /* zero filled by mkreiserfs and 857 * reiserfs_convert_objectid_map_v1() 858 * so any additions must be updated 859 * there as well. */ 860 } __attribute__ ((__packed__)); 861 862 #define SB_SIZE (sizeof(struct reiserfs_super_block)) 863 864 #define REISERFS_VERSION_1 0 865 #define REISERFS_VERSION_2 2 866 867 // on-disk super block fields converted to cpu form 868 #define SB_DISK_SUPER_BLOCK(s) (REISERFS_SB(s)->s_rs) 869 #define SB_V1_DISK_SUPER_BLOCK(s) (&(SB_DISK_SUPER_BLOCK(s)->s_v1)) 870 #define SB_BLOCKSIZE(s) \ 871 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_blocksize)) 872 #define SB_BLOCK_COUNT(s) \ 873 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_block_count)) 874 #define SB_FREE_BLOCKS(s) \ 875 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_free_blocks)) 876 #define SB_REISERFS_MAGIC(s) \ 877 (SB_V1_DISK_SUPER_BLOCK(s)->s_magic) 878 #define SB_ROOT_BLOCK(s) \ 879 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_root_block)) 880 #define SB_TREE_HEIGHT(s) \ 881 le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_tree_height)) 882 #define SB_REISERFS_STATE(s) \ 883 le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_umount_state)) 884 #define SB_VERSION(s) le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_version)) 885 #define SB_BMAP_NR(s) le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_bmap_nr)) 886 887 #define PUT_SB_BLOCK_COUNT(s, val) \ 888 do { SB_V1_DISK_SUPER_BLOCK(s)->s_block_count = cpu_to_le32(val); } while (0) 889 #define PUT_SB_FREE_BLOCKS(s, val) \ 890 do { SB_V1_DISK_SUPER_BLOCK(s)->s_free_blocks = cpu_to_le32(val); } while (0) 891 #define PUT_SB_ROOT_BLOCK(s, val) \ 892 do { SB_V1_DISK_SUPER_BLOCK(s)->s_root_block = cpu_to_le32(val); } while (0) 893 #define PUT_SB_TREE_HEIGHT(s, val) \ 894 do { SB_V1_DISK_SUPER_BLOCK(s)->s_tree_height = cpu_to_le16(val); } while (0) 895 #define PUT_SB_REISERFS_STATE(s, val) \ 896 do { SB_V1_DISK_SUPER_BLOCK(s)->s_umount_state = cpu_to_le16(val); } while (0) 897 #define PUT_SB_VERSION(s, val) \ 898 do { SB_V1_DISK_SUPER_BLOCK(s)->s_version = cpu_to_le16(val); } while (0) 899 #define PUT_SB_BMAP_NR(s, val) \ 900 do { SB_V1_DISK_SUPER_BLOCK(s)->s_bmap_nr = cpu_to_le16 (val); } while (0) 901 902 #define SB_ONDISK_JP(s) (&SB_V1_DISK_SUPER_BLOCK(s)->s_journal) 903 #define SB_ONDISK_JOURNAL_SIZE(s) \ 904 le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_size)) 905 #define SB_ONDISK_JOURNAL_1st_BLOCK(s) \ 906 le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_1st_block)) 907 #define SB_ONDISK_JOURNAL_DEVICE(s) \ 908 le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_dev)) 909 #define SB_ONDISK_RESERVED_FOR_JOURNAL(s) \ 910 le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_reserved_for_journal)) 911 912 #define is_block_in_log_or_reserved_area(s, block) \ 913 block >= SB_JOURNAL_1st_RESERVED_BLOCK(s) \ 914 && block < SB_JOURNAL_1st_RESERVED_BLOCK(s) + \ 915 ((!is_reiserfs_jr(SB_DISK_SUPER_BLOCK(s)) ? \ 916 SB_ONDISK_JOURNAL_SIZE(s) + 1 : SB_ONDISK_RESERVED_FOR_JOURNAL(s))) 917 918 int is_reiserfs_3_5(struct reiserfs_super_block *rs); 919 int is_reiserfs_3_6(struct reiserfs_super_block *rs); 920 int is_reiserfs_jr(struct reiserfs_super_block *rs); 921 922 /* ReiserFS leaves the first 64k unused, so that partition labels have 923 enough space. If someone wants to write a fancy bootloader that 924 needs more than 64k, let us know, and this will be increased in size. 925 This number must be larger than than the largest block size on any 926 platform, or code will break. -Hans */ 927 #define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024) 928 #define REISERFS_FIRST_BLOCK unused_define 929 #define REISERFS_JOURNAL_OFFSET_IN_BYTES REISERFS_DISK_OFFSET_IN_BYTES 930 931 /* the spot for the super in versions 3.5 - 3.5.10 (inclusive) */ 932 #define REISERFS_OLD_DISK_OFFSET_IN_BYTES (8 * 1024) 933 934 /* reiserfs internal error code (used by search_by_key and fix_nodes)) */ 935 #define CARRY_ON 0 936 #define REPEAT_SEARCH -1 937 #define IO_ERROR -2 938 #define NO_DISK_SPACE -3 939 #define NO_BALANCING_NEEDED (-4) 940 #define NO_MORE_UNUSED_CONTIGUOUS_BLOCKS (-5) 941 #define QUOTA_EXCEEDED -6 942 943 typedef __u32 b_blocknr_t; 944 typedef __le32 unp_t; 945 946 struct unfm_nodeinfo { 947 unp_t unfm_nodenum; 948 unsigned short unfm_freespace; 949 }; 950 951 /* there are two formats of keys: 3.5 and 3.6 952 */ 953 #define KEY_FORMAT_3_5 0 954 #define KEY_FORMAT_3_6 1 955 956 /* there are two stat datas */ 957 #define STAT_DATA_V1 0 958 #define STAT_DATA_V2 1 959 960 static inline struct reiserfs_inode_info *REISERFS_I(const struct inode *inode) 961 { 962 return container_of(inode, struct reiserfs_inode_info, vfs_inode); 963 } 964 965 static inline struct reiserfs_sb_info *REISERFS_SB(const struct super_block *sb) 966 { 967 return sb->s_fs_info; 968 } 969 970 /* Don't trust REISERFS_SB(sb)->s_bmap_nr, it's a u16 971 * which overflows on large file systems. */ 972 static inline __u32 reiserfs_bmap_count(struct super_block *sb) 973 { 974 return (SB_BLOCK_COUNT(sb) - 1) / (sb->s_blocksize * 8) + 1; 975 } 976 977 static inline int bmap_would_wrap(unsigned bmap_nr) 978 { 979 return bmap_nr > ((1LL << 16) - 1); 980 } 981 982 /** this says about version of key of all items (but stat data) the 983 object consists of */ 984 #define get_inode_item_key_version( inode ) \ 985 ((REISERFS_I(inode)->i_flags & i_item_key_version_mask) ? KEY_FORMAT_3_6 : KEY_FORMAT_3_5) 986 987 #define set_inode_item_key_version( inode, version ) \ 988 ({ if((version)==KEY_FORMAT_3_6) \ 989 REISERFS_I(inode)->i_flags |= i_item_key_version_mask; \ 990 else \ 991 REISERFS_I(inode)->i_flags &= ~i_item_key_version_mask; }) 992 993 #define get_inode_sd_version(inode) \ 994 ((REISERFS_I(inode)->i_flags & i_stat_data_version_mask) ? STAT_DATA_V2 : STAT_DATA_V1) 995 996 #define set_inode_sd_version(inode, version) \ 997 ({ if((version)==STAT_DATA_V2) \ 998 REISERFS_I(inode)->i_flags |= i_stat_data_version_mask; \ 999 else \ 1000 REISERFS_I(inode)->i_flags &= ~i_stat_data_version_mask; }) 1001 1002 /* This is an aggressive tail suppression policy, I am hoping it 1003 improves our benchmarks. The principle behind it is that percentage 1004 space saving is what matters, not absolute space saving. This is 1005 non-intuitive, but it helps to understand it if you consider that the 1006 cost to access 4 blocks is not much more than the cost to access 1 1007 block, if you have to do a seek and rotate. A tail risks a 1008 non-linear disk access that is significant as a percentage of total 1009 time cost for a 4 block file and saves an amount of space that is 1010 less significant as a percentage of space, or so goes the hypothesis. 1011 -Hans */ 1012 #define STORE_TAIL_IN_UNFM_S1(n_file_size,n_tail_size,n_block_size) \ 1013 (\ 1014 (!(n_tail_size)) || \ 1015 (((n_tail_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) || \ 1016 ( (n_file_size) >= (n_block_size) * 4 ) || \ 1017 ( ( (n_file_size) >= (n_block_size) * 3 ) && \ 1018 ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size))/4) ) || \ 1019 ( ( (n_file_size) >= (n_block_size) * 2 ) && \ 1020 ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size))/2) ) || \ 1021 ( ( (n_file_size) >= (n_block_size) ) && \ 1022 ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size) * 3)/4) ) ) \ 1023 ) 1024 1025 /* Another strategy for tails, this one means only create a tail if all the 1026 file would fit into one DIRECT item. 1027 Primary intention for this one is to increase performance by decreasing 1028 seeking. 1029 */ 1030 #define STORE_TAIL_IN_UNFM_S2(n_file_size,n_tail_size,n_block_size) \ 1031 (\ 1032 (!(n_tail_size)) || \ 1033 (((n_file_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) ) \ 1034 ) 1035 1036 /* 1037 * values for s_umount_state field 1038 */ 1039 #define REISERFS_VALID_FS 1 1040 #define REISERFS_ERROR_FS 2 1041 1042 // 1043 // there are 5 item types currently 1044 // 1045 #define TYPE_STAT_DATA 0 1046 #define TYPE_INDIRECT 1 1047 #define TYPE_DIRECT 2 1048 #define TYPE_DIRENTRY 3 1049 #define TYPE_MAXTYPE 3 1050 #define TYPE_ANY 15 // FIXME: comment is required 1051 1052 /***************************************************************************/ 1053 /* KEY & ITEM HEAD */ 1054 /***************************************************************************/ 1055 1056 // 1057 // directories use this key as well as old files 1058 // 1059 struct offset_v1 { 1060 __le32 k_offset; 1061 __le32 k_uniqueness; 1062 } __attribute__ ((__packed__)); 1063 1064 struct offset_v2 { 1065 __le64 v; 1066 } __attribute__ ((__packed__)); 1067 1068 static inline __u16 offset_v2_k_type(const struct offset_v2 *v2) 1069 { 1070 __u8 type = le64_to_cpu(v2->v) >> 60; 1071 return (type <= TYPE_MAXTYPE) ? type : TYPE_ANY; 1072 } 1073 1074 static inline void set_offset_v2_k_type(struct offset_v2 *v2, int type) 1075 { 1076 v2->v = 1077 (v2->v & cpu_to_le64(~0ULL >> 4)) | cpu_to_le64((__u64) type << 60); 1078 } 1079 1080 static inline loff_t offset_v2_k_offset(const struct offset_v2 *v2) 1081 { 1082 return le64_to_cpu(v2->v) & (~0ULL >> 4); 1083 } 1084 1085 static inline void set_offset_v2_k_offset(struct offset_v2 *v2, loff_t offset) 1086 { 1087 offset &= (~0ULL >> 4); 1088 v2->v = (v2->v & cpu_to_le64(15ULL << 60)) | cpu_to_le64(offset); 1089 } 1090 1091 /* Key of an item determines its location in the S+tree, and 1092 is composed of 4 components */ 1093 struct reiserfs_key { 1094 __le32 k_dir_id; /* packing locality: by default parent 1095 directory object id */ 1096 __le32 k_objectid; /* object identifier */ 1097 union { 1098 struct offset_v1 k_offset_v1; 1099 struct offset_v2 k_offset_v2; 1100 } __attribute__ ((__packed__)) u; 1101 } __attribute__ ((__packed__)); 1102 1103 struct in_core_key { 1104 __u32 k_dir_id; /* packing locality: by default parent 1105 directory object id */ 1106 __u32 k_objectid; /* object identifier */ 1107 __u64 k_offset; 1108 __u8 k_type; 1109 }; 1110 1111 struct cpu_key { 1112 struct in_core_key on_disk_key; 1113 int version; 1114 int key_length; /* 3 in all cases but direct2indirect and 1115 indirect2direct conversion */ 1116 }; 1117 1118 /* Our function for comparing keys can compare keys of different 1119 lengths. It takes as a parameter the length of the keys it is to 1120 compare. These defines are used in determining what is to be passed 1121 to it as that parameter. */ 1122 #define REISERFS_FULL_KEY_LEN 4 1123 #define REISERFS_SHORT_KEY_LEN 2 1124 1125 /* The result of the key compare */ 1126 #define FIRST_GREATER 1 1127 #define SECOND_GREATER -1 1128 #define KEYS_IDENTICAL 0 1129 #define KEY_FOUND 1 1130 #define KEY_NOT_FOUND 0 1131 1132 #define KEY_SIZE (sizeof(struct reiserfs_key)) 1133 #define SHORT_KEY_SIZE (sizeof (__u32) + sizeof (__u32)) 1134 1135 /* return values for search_by_key and clones */ 1136 #define ITEM_FOUND 1 1137 #define ITEM_NOT_FOUND 0 1138 #define ENTRY_FOUND 1 1139 #define ENTRY_NOT_FOUND 0 1140 #define DIRECTORY_NOT_FOUND -1 1141 #define REGULAR_FILE_FOUND -2 1142 #define DIRECTORY_FOUND -3 1143 #define BYTE_FOUND 1 1144 #define BYTE_NOT_FOUND 0 1145 #define FILE_NOT_FOUND -1 1146 1147 #define POSITION_FOUND 1 1148 #define POSITION_NOT_FOUND 0 1149 1150 // return values for reiserfs_find_entry and search_by_entry_key 1151 #define NAME_FOUND 1 1152 #define NAME_NOT_FOUND 0 1153 #define GOTO_PREVIOUS_ITEM 2 1154 #define NAME_FOUND_INVISIBLE 3 1155 1156 /* Everything in the filesystem is stored as a set of items. The 1157 item head contains the key of the item, its free space (for 1158 indirect items) and specifies the location of the item itself 1159 within the block. */ 1160 1161 struct item_head { 1162 /* Everything in the tree is found by searching for it based on 1163 * its key.*/ 1164 struct reiserfs_key ih_key; 1165 union { 1166 /* The free space in the last unformatted node of an 1167 indirect item if this is an indirect item. This 1168 equals 0xFFFF iff this is a direct item or stat data 1169 item. Note that the key, not this field, is used to 1170 determine the item type, and thus which field this 1171 union contains. */ 1172 __le16 ih_free_space_reserved; 1173 /* Iff this is a directory item, this field equals the 1174 number of directory entries in the directory item. */ 1175 __le16 ih_entry_count; 1176 } __attribute__ ((__packed__)) u; 1177 __le16 ih_item_len; /* total size of the item body */ 1178 __le16 ih_item_location; /* an offset to the item body 1179 * within the block */ 1180 __le16 ih_version; /* 0 for all old items, 2 for new 1181 ones. Highest bit is set by fsck 1182 temporary, cleaned after all 1183 done */ 1184 } __attribute__ ((__packed__)); 1185 /* size of item header */ 1186 #define IH_SIZE (sizeof(struct item_head)) 1187 1188 #define ih_free_space(ih) le16_to_cpu((ih)->u.ih_free_space_reserved) 1189 #define ih_version(ih) le16_to_cpu((ih)->ih_version) 1190 #define ih_entry_count(ih) le16_to_cpu((ih)->u.ih_entry_count) 1191 #define ih_location(ih) le16_to_cpu((ih)->ih_item_location) 1192 #define ih_item_len(ih) le16_to_cpu((ih)->ih_item_len) 1193 1194 #define put_ih_free_space(ih, val) do { (ih)->u.ih_free_space_reserved = cpu_to_le16(val); } while(0) 1195 #define put_ih_version(ih, val) do { (ih)->ih_version = cpu_to_le16(val); } while (0) 1196 #define put_ih_entry_count(ih, val) do { (ih)->u.ih_entry_count = cpu_to_le16(val); } while (0) 1197 #define put_ih_location(ih, val) do { (ih)->ih_item_location = cpu_to_le16(val); } while (0) 1198 #define put_ih_item_len(ih, val) do { (ih)->ih_item_len = cpu_to_le16(val); } while (0) 1199 1200 #define unreachable_item(ih) (ih_version(ih) & (1 << 15)) 1201 1202 #define get_ih_free_space(ih) (ih_version (ih) == KEY_FORMAT_3_6 ? 0 : ih_free_space (ih)) 1203 #define set_ih_free_space(ih,val) put_ih_free_space((ih), ((ih_version(ih) == KEY_FORMAT_3_6) ? 0 : (val))) 1204 1205 /* these operate on indirect items, where you've got an array of ints 1206 ** at a possibly unaligned location. These are a noop on ia32 1207 ** 1208 ** p is the array of __u32, i is the index into the array, v is the value 1209 ** to store there. 1210 */ 1211 #define get_block_num(p, i) get_unaligned_le32((p) + (i)) 1212 #define put_block_num(p, i, v) put_unaligned_le32((v), (p) + (i)) 1213 1214 // 1215 // in old version uniqueness field shows key type 1216 // 1217 #define V1_SD_UNIQUENESS 0 1218 #define V1_INDIRECT_UNIQUENESS 0xfffffffe 1219 #define V1_DIRECT_UNIQUENESS 0xffffffff 1220 #define V1_DIRENTRY_UNIQUENESS 500 1221 #define V1_ANY_UNIQUENESS 555 // FIXME: comment is required 1222 1223 // 1224 // here are conversion routines 1225 // 1226 static inline int uniqueness2type(__u32 uniqueness) CONSTF; 1227 static inline int uniqueness2type(__u32 uniqueness) 1228 { 1229 switch ((int)uniqueness) { 1230 case V1_SD_UNIQUENESS: 1231 return TYPE_STAT_DATA; 1232 case V1_INDIRECT_UNIQUENESS: 1233 return TYPE_INDIRECT; 1234 case V1_DIRECT_UNIQUENESS: 1235 return TYPE_DIRECT; 1236 case V1_DIRENTRY_UNIQUENESS: 1237 return TYPE_DIRENTRY; 1238 case V1_ANY_UNIQUENESS: 1239 default: 1240 return TYPE_ANY; 1241 } 1242 } 1243 1244 static inline __u32 type2uniqueness(int type) CONSTF; 1245 static inline __u32 type2uniqueness(int type) 1246 { 1247 switch (type) { 1248 case TYPE_STAT_DATA: 1249 return V1_SD_UNIQUENESS; 1250 case TYPE_INDIRECT: 1251 return V1_INDIRECT_UNIQUENESS; 1252 case TYPE_DIRECT: 1253 return V1_DIRECT_UNIQUENESS; 1254 case TYPE_DIRENTRY: 1255 return V1_DIRENTRY_UNIQUENESS; 1256 case TYPE_ANY: 1257 default: 1258 return V1_ANY_UNIQUENESS; 1259 } 1260 } 1261 1262 // 1263 // key is pointer to on disk key which is stored in le, result is cpu, 1264 // there is no way to get version of object from key, so, provide 1265 // version to these defines 1266 // 1267 static inline loff_t le_key_k_offset(int version, 1268 const struct reiserfs_key *key) 1269 { 1270 return (version == KEY_FORMAT_3_5) ? 1271 le32_to_cpu(key->u.k_offset_v1.k_offset) : 1272 offset_v2_k_offset(&(key->u.k_offset_v2)); 1273 } 1274 1275 static inline loff_t le_ih_k_offset(const struct item_head *ih) 1276 { 1277 return le_key_k_offset(ih_version(ih), &(ih->ih_key)); 1278 } 1279 1280 static inline loff_t le_key_k_type(int version, const struct reiserfs_key *key) 1281 { 1282 return (version == KEY_FORMAT_3_5) ? 1283 uniqueness2type(le32_to_cpu(key->u.k_offset_v1.k_uniqueness)) : 1284 offset_v2_k_type(&(key->u.k_offset_v2)); 1285 } 1286 1287 static inline loff_t le_ih_k_type(const struct item_head *ih) 1288 { 1289 return le_key_k_type(ih_version(ih), &(ih->ih_key)); 1290 } 1291 1292 static inline void set_le_key_k_offset(int version, struct reiserfs_key *key, 1293 loff_t offset) 1294 { 1295 (version == KEY_FORMAT_3_5) ? (void)(key->u.k_offset_v1.k_offset = cpu_to_le32(offset)) : /* jdm check */ 1296 (void)(set_offset_v2_k_offset(&(key->u.k_offset_v2), offset)); 1297 } 1298 1299 static inline void set_le_ih_k_offset(struct item_head *ih, loff_t offset) 1300 { 1301 set_le_key_k_offset(ih_version(ih), &(ih->ih_key), offset); 1302 } 1303 1304 static inline void set_le_key_k_type(int version, struct reiserfs_key *key, 1305 int type) 1306 { 1307 (version == KEY_FORMAT_3_5) ? 1308 (void)(key->u.k_offset_v1.k_uniqueness = 1309 cpu_to_le32(type2uniqueness(type))) 1310 : (void)(set_offset_v2_k_type(&(key->u.k_offset_v2), type)); 1311 } 1312 1313 static inline void set_le_ih_k_type(struct item_head *ih, int type) 1314 { 1315 set_le_key_k_type(ih_version(ih), &(ih->ih_key), type); 1316 } 1317 1318 static inline int is_direntry_le_key(int version, struct reiserfs_key *key) 1319 { 1320 return le_key_k_type(version, key) == TYPE_DIRENTRY; 1321 } 1322 1323 static inline int is_direct_le_key(int version, struct reiserfs_key *key) 1324 { 1325 return le_key_k_type(version, key) == TYPE_DIRECT; 1326 } 1327 1328 static inline int is_indirect_le_key(int version, struct reiserfs_key *key) 1329 { 1330 return le_key_k_type(version, key) == TYPE_INDIRECT; 1331 } 1332 1333 static inline int is_statdata_le_key(int version, struct reiserfs_key *key) 1334 { 1335 return le_key_k_type(version, key) == TYPE_STAT_DATA; 1336 } 1337 1338 // 1339 // item header has version. 1340 // 1341 static inline int is_direntry_le_ih(struct item_head *ih) 1342 { 1343 return is_direntry_le_key(ih_version(ih), &ih->ih_key); 1344 } 1345 1346 static inline int is_direct_le_ih(struct item_head *ih) 1347 { 1348 return is_direct_le_key(ih_version(ih), &ih->ih_key); 1349 } 1350 1351 static inline int is_indirect_le_ih(struct item_head *ih) 1352 { 1353 return is_indirect_le_key(ih_version(ih), &ih->ih_key); 1354 } 1355 1356 static inline int is_statdata_le_ih(struct item_head *ih) 1357 { 1358 return is_statdata_le_key(ih_version(ih), &ih->ih_key); 1359 } 1360 1361 // 1362 // key is pointer to cpu key, result is cpu 1363 // 1364 static inline loff_t cpu_key_k_offset(const struct cpu_key *key) 1365 { 1366 return key->on_disk_key.k_offset; 1367 } 1368 1369 static inline loff_t cpu_key_k_type(const struct cpu_key *key) 1370 { 1371 return key->on_disk_key.k_type; 1372 } 1373 1374 static inline void set_cpu_key_k_offset(struct cpu_key *key, loff_t offset) 1375 { 1376 key->on_disk_key.k_offset = offset; 1377 } 1378 1379 static inline void set_cpu_key_k_type(struct cpu_key *key, int type) 1380 { 1381 key->on_disk_key.k_type = type; 1382 } 1383 1384 static inline void cpu_key_k_offset_dec(struct cpu_key *key) 1385 { 1386 key->on_disk_key.k_offset--; 1387 } 1388 1389 #define is_direntry_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRENTRY) 1390 #define is_direct_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRECT) 1391 #define is_indirect_cpu_key(key) (cpu_key_k_type (key) == TYPE_INDIRECT) 1392 #define is_statdata_cpu_key(key) (cpu_key_k_type (key) == TYPE_STAT_DATA) 1393 1394 /* are these used ? */ 1395 #define is_direntry_cpu_ih(ih) (is_direntry_cpu_key (&((ih)->ih_key))) 1396 #define is_direct_cpu_ih(ih) (is_direct_cpu_key (&((ih)->ih_key))) 1397 #define is_indirect_cpu_ih(ih) (is_indirect_cpu_key (&((ih)->ih_key))) 1398 #define is_statdata_cpu_ih(ih) (is_statdata_cpu_key (&((ih)->ih_key))) 1399 1400 #define I_K_KEY_IN_ITEM(ih, key, n_blocksize) \ 1401 (!COMP_SHORT_KEYS(ih, key) && \ 1402 I_OFF_BYTE_IN_ITEM(ih, k_offset(key), n_blocksize)) 1403 1404 /* maximal length of item */ 1405 #define MAX_ITEM_LEN(block_size) (block_size - BLKH_SIZE - IH_SIZE) 1406 #define MIN_ITEM_LEN 1 1407 1408 /* object identifier for root dir */ 1409 #define REISERFS_ROOT_OBJECTID 2 1410 #define REISERFS_ROOT_PARENT_OBJECTID 1 1411 1412 extern struct reiserfs_key root_key; 1413 1414 /* 1415 * Picture represents a leaf of the S+tree 1416 * ______________________________________________________ 1417 * | | Array of | | | 1418 * |Block | Object-Item | F r e e | Objects- | 1419 * | head | Headers | S p a c e | Items | 1420 * |______|_______________|___________________|___________| 1421 */ 1422 1423 /* Header of a disk block. More precisely, header of a formatted leaf 1424 or internal node, and not the header of an unformatted node. */ 1425 struct block_head { 1426 __le16 blk_level; /* Level of a block in the tree. */ 1427 __le16 blk_nr_item; /* Number of keys/items in a block. */ 1428 __le16 blk_free_space; /* Block free space in bytes. */ 1429 __le16 blk_reserved; 1430 /* dump this in v4/planA */ 1431 struct reiserfs_key blk_right_delim_key; /* kept only for compatibility */ 1432 }; 1433 1434 #define BLKH_SIZE (sizeof(struct block_head)) 1435 #define blkh_level(p_blkh) (le16_to_cpu((p_blkh)->blk_level)) 1436 #define blkh_nr_item(p_blkh) (le16_to_cpu((p_blkh)->blk_nr_item)) 1437 #define blkh_free_space(p_blkh) (le16_to_cpu((p_blkh)->blk_free_space)) 1438 #define blkh_reserved(p_blkh) (le16_to_cpu((p_blkh)->blk_reserved)) 1439 #define set_blkh_level(p_blkh,val) ((p_blkh)->blk_level = cpu_to_le16(val)) 1440 #define set_blkh_nr_item(p_blkh,val) ((p_blkh)->blk_nr_item = cpu_to_le16(val)) 1441 #define set_blkh_free_space(p_blkh,val) ((p_blkh)->blk_free_space = cpu_to_le16(val)) 1442 #define set_blkh_reserved(p_blkh,val) ((p_blkh)->blk_reserved = cpu_to_le16(val)) 1443 #define blkh_right_delim_key(p_blkh) ((p_blkh)->blk_right_delim_key) 1444 #define set_blkh_right_delim_key(p_blkh,val) ((p_blkh)->blk_right_delim_key = val) 1445 1446 /* 1447 * values for blk_level field of the struct block_head 1448 */ 1449 1450 #define FREE_LEVEL 0 /* when node gets removed from the tree its 1451 blk_level is set to FREE_LEVEL. It is then 1452 used to see whether the node is still in the 1453 tree */ 1454 1455 #define DISK_LEAF_NODE_LEVEL 1 /* Leaf node level. */ 1456 1457 /* Given the buffer head of a formatted node, resolve to the block head of that node. */ 1458 #define B_BLK_HEAD(bh) ((struct block_head *)((bh)->b_data)) 1459 /* Number of items that are in buffer. */ 1460 #define B_NR_ITEMS(bh) (blkh_nr_item(B_BLK_HEAD(bh))) 1461 #define B_LEVEL(bh) (blkh_level(B_BLK_HEAD(bh))) 1462 #define B_FREE_SPACE(bh) (blkh_free_space(B_BLK_HEAD(bh))) 1463 1464 #define PUT_B_NR_ITEMS(bh, val) do { set_blkh_nr_item(B_BLK_HEAD(bh), val); } while (0) 1465 #define PUT_B_LEVEL(bh, val) do { set_blkh_level(B_BLK_HEAD(bh), val); } while (0) 1466 #define PUT_B_FREE_SPACE(bh, val) do { set_blkh_free_space(B_BLK_HEAD(bh), val); } while (0) 1467 1468 /* Get right delimiting key. -- little endian */ 1469 #define B_PRIGHT_DELIM_KEY(bh) (&(blk_right_delim_key(B_BLK_HEAD(bh)))) 1470 1471 /* Does the buffer contain a disk leaf. */ 1472 #define B_IS_ITEMS_LEVEL(bh) (B_LEVEL(bh) == DISK_LEAF_NODE_LEVEL) 1473 1474 /* Does the buffer contain a disk internal node */ 1475 #define B_IS_KEYS_LEVEL(bh) (B_LEVEL(bh) > DISK_LEAF_NODE_LEVEL \ 1476 && B_LEVEL(bh) <= MAX_HEIGHT) 1477 1478 /***************************************************************************/ 1479 /* STAT DATA */ 1480 /***************************************************************************/ 1481 1482 // 1483 // old stat data is 32 bytes long. We are going to distinguish new one by 1484 // different size 1485 // 1486 struct stat_data_v1 { 1487 __le16 sd_mode; /* file type, permissions */ 1488 __le16 sd_nlink; /* number of hard links */ 1489 __le16 sd_uid; /* owner */ 1490 __le16 sd_gid; /* group */ 1491 __le32 sd_size; /* file size */ 1492 __le32 sd_atime; /* time of last access */ 1493 __le32 sd_mtime; /* time file was last modified */ 1494 __le32 sd_ctime; /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */ 1495 union { 1496 __le32 sd_rdev; 1497 __le32 sd_blocks; /* number of blocks file uses */ 1498 } __attribute__ ((__packed__)) u; 1499 __le32 sd_first_direct_byte; /* first byte of file which is stored 1500 in a direct item: except that if it 1501 equals 1 it is a symlink and if it 1502 equals ~(__u32)0 there is no 1503 direct item. The existence of this 1504 field really grates on me. Let's 1505 replace it with a macro based on 1506 sd_size and our tail suppression 1507 policy. Someday. -Hans */ 1508 } __attribute__ ((__packed__)); 1509 1510 #define SD_V1_SIZE (sizeof(struct stat_data_v1)) 1511 #define stat_data_v1(ih) (ih_version (ih) == KEY_FORMAT_3_5) 1512 #define sd_v1_mode(sdp) (le16_to_cpu((sdp)->sd_mode)) 1513 #define set_sd_v1_mode(sdp,v) ((sdp)->sd_mode = cpu_to_le16(v)) 1514 #define sd_v1_nlink(sdp) (le16_to_cpu((sdp)->sd_nlink)) 1515 #define set_sd_v1_nlink(sdp,v) ((sdp)->sd_nlink = cpu_to_le16(v)) 1516 #define sd_v1_uid(sdp) (le16_to_cpu((sdp)->sd_uid)) 1517 #define set_sd_v1_uid(sdp,v) ((sdp)->sd_uid = cpu_to_le16(v)) 1518 #define sd_v1_gid(sdp) (le16_to_cpu((sdp)->sd_gid)) 1519 #define set_sd_v1_gid(sdp,v) ((sdp)->sd_gid = cpu_to_le16(v)) 1520 #define sd_v1_size(sdp) (le32_to_cpu((sdp)->sd_size)) 1521 #define set_sd_v1_size(sdp,v) ((sdp)->sd_size = cpu_to_le32(v)) 1522 #define sd_v1_atime(sdp) (le32_to_cpu((sdp)->sd_atime)) 1523 #define set_sd_v1_atime(sdp,v) ((sdp)->sd_atime = cpu_to_le32(v)) 1524 #define sd_v1_mtime(sdp) (le32_to_cpu((sdp)->sd_mtime)) 1525 #define set_sd_v1_mtime(sdp,v) ((sdp)->sd_mtime = cpu_to_le32(v)) 1526 #define sd_v1_ctime(sdp) (le32_to_cpu((sdp)->sd_ctime)) 1527 #define set_sd_v1_ctime(sdp,v) ((sdp)->sd_ctime = cpu_to_le32(v)) 1528 #define sd_v1_rdev(sdp) (le32_to_cpu((sdp)->u.sd_rdev)) 1529 #define set_sd_v1_rdev(sdp,v) ((sdp)->u.sd_rdev = cpu_to_le32(v)) 1530 #define sd_v1_blocks(sdp) (le32_to_cpu((sdp)->u.sd_blocks)) 1531 #define set_sd_v1_blocks(sdp,v) ((sdp)->u.sd_blocks = cpu_to_le32(v)) 1532 #define sd_v1_first_direct_byte(sdp) \ 1533 (le32_to_cpu((sdp)->sd_first_direct_byte)) 1534 #define set_sd_v1_first_direct_byte(sdp,v) \ 1535 ((sdp)->sd_first_direct_byte = cpu_to_le32(v)) 1536 1537 /* inode flags stored in sd_attrs (nee sd_reserved) */ 1538 1539 /* we want common flags to have the same values as in ext2, 1540 so chattr(1) will work without problems */ 1541 #define REISERFS_IMMUTABLE_FL FS_IMMUTABLE_FL 1542 #define REISERFS_APPEND_FL FS_APPEND_FL 1543 #define REISERFS_SYNC_FL FS_SYNC_FL 1544 #define REISERFS_NOATIME_FL FS_NOATIME_FL 1545 #define REISERFS_NODUMP_FL FS_NODUMP_FL 1546 #define REISERFS_SECRM_FL FS_SECRM_FL 1547 #define REISERFS_UNRM_FL FS_UNRM_FL 1548 #define REISERFS_COMPR_FL FS_COMPR_FL 1549 #define REISERFS_NOTAIL_FL FS_NOTAIL_FL 1550 1551 /* persistent flags that file inherits from the parent directory */ 1552 #define REISERFS_INHERIT_MASK ( REISERFS_IMMUTABLE_FL | \ 1553 REISERFS_SYNC_FL | \ 1554 REISERFS_NOATIME_FL | \ 1555 REISERFS_NODUMP_FL | \ 1556 REISERFS_SECRM_FL | \ 1557 REISERFS_COMPR_FL | \ 1558 REISERFS_NOTAIL_FL ) 1559 1560 /* Stat Data on disk (reiserfs version of UFS disk inode minus the 1561 address blocks) */ 1562 struct stat_data { 1563 __le16 sd_mode; /* file type, permissions */ 1564 __le16 sd_attrs; /* persistent inode flags */ 1565 __le32 sd_nlink; /* number of hard links */ 1566 __le64 sd_size; /* file size */ 1567 __le32 sd_uid; /* owner */ 1568 __le32 sd_gid; /* group */ 1569 __le32 sd_atime; /* time of last access */ 1570 __le32 sd_mtime; /* time file was last modified */ 1571 __le32 sd_ctime; /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */ 1572 __le32 sd_blocks; 1573 union { 1574 __le32 sd_rdev; 1575 __le32 sd_generation; 1576 //__le32 sd_first_direct_byte; 1577 /* first byte of file which is stored in a 1578 direct item: except that if it equals 1 1579 it is a symlink and if it equals 1580 ~(__u32)0 there is no direct item. The 1581 existence of this field really grates 1582 on me. Let's replace it with a macro 1583 based on sd_size and our tail 1584 suppression policy? */ 1585 } __attribute__ ((__packed__)) u; 1586 } __attribute__ ((__packed__)); 1587 // 1588 // this is 44 bytes long 1589 // 1590 #define SD_SIZE (sizeof(struct stat_data)) 1591 #define SD_V2_SIZE SD_SIZE 1592 #define stat_data_v2(ih) (ih_version (ih) == KEY_FORMAT_3_6) 1593 #define sd_v2_mode(sdp) (le16_to_cpu((sdp)->sd_mode)) 1594 #define set_sd_v2_mode(sdp,v) ((sdp)->sd_mode = cpu_to_le16(v)) 1595 /* sd_reserved */ 1596 /* set_sd_reserved */ 1597 #define sd_v2_nlink(sdp) (le32_to_cpu((sdp)->sd_nlink)) 1598 #define set_sd_v2_nlink(sdp,v) ((sdp)->sd_nlink = cpu_to_le32(v)) 1599 #define sd_v2_size(sdp) (le64_to_cpu((sdp)->sd_size)) 1600 #define set_sd_v2_size(sdp,v) ((sdp)->sd_size = cpu_to_le64(v)) 1601 #define sd_v2_uid(sdp) (le32_to_cpu((sdp)->sd_uid)) 1602 #define set_sd_v2_uid(sdp,v) ((sdp)->sd_uid = cpu_to_le32(v)) 1603 #define sd_v2_gid(sdp) (le32_to_cpu((sdp)->sd_gid)) 1604 #define set_sd_v2_gid(sdp,v) ((sdp)->sd_gid = cpu_to_le32(v)) 1605 #define sd_v2_atime(sdp) (le32_to_cpu((sdp)->sd_atime)) 1606 #define set_sd_v2_atime(sdp,v) ((sdp)->sd_atime = cpu_to_le32(v)) 1607 #define sd_v2_mtime(sdp) (le32_to_cpu((sdp)->sd_mtime)) 1608 #define set_sd_v2_mtime(sdp,v) ((sdp)->sd_mtime = cpu_to_le32(v)) 1609 #define sd_v2_ctime(sdp) (le32_to_cpu((sdp)->sd_ctime)) 1610 #define set_sd_v2_ctime(sdp,v) ((sdp)->sd_ctime = cpu_to_le32(v)) 1611 #define sd_v2_blocks(sdp) (le32_to_cpu((sdp)->sd_blocks)) 1612 #define set_sd_v2_blocks(sdp,v) ((sdp)->sd_blocks = cpu_to_le32(v)) 1613 #define sd_v2_rdev(sdp) (le32_to_cpu((sdp)->u.sd_rdev)) 1614 #define set_sd_v2_rdev(sdp,v) ((sdp)->u.sd_rdev = cpu_to_le32(v)) 1615 #define sd_v2_generation(sdp) (le32_to_cpu((sdp)->u.sd_generation)) 1616 #define set_sd_v2_generation(sdp,v) ((sdp)->u.sd_generation = cpu_to_le32(v)) 1617 #define sd_v2_attrs(sdp) (le16_to_cpu((sdp)->sd_attrs)) 1618 #define set_sd_v2_attrs(sdp,v) ((sdp)->sd_attrs = cpu_to_le16(v)) 1619 1620 /***************************************************************************/ 1621 /* DIRECTORY STRUCTURE */ 1622 /***************************************************************************/ 1623 /* 1624 Picture represents the structure of directory items 1625 ________________________________________________ 1626 | Array of | | | | | | 1627 | directory |N-1| N-2 | .... | 1st |0th| 1628 | entry headers | | | | | | 1629 |_______________|___|_____|________|_______|___| 1630 <---- directory entries ------> 1631 1632 First directory item has k_offset component 1. We store "." and ".." 1633 in one item, always, we never split "." and ".." into differing 1634 items. This makes, among other things, the code for removing 1635 directories simpler. */ 1636 #define SD_OFFSET 0 1637 #define SD_UNIQUENESS 0 1638 #define DOT_OFFSET 1 1639 #define DOT_DOT_OFFSET 2 1640 #define DIRENTRY_UNIQUENESS 500 1641 1642 /* */ 1643 #define FIRST_ITEM_OFFSET 1 1644 1645 /* 1646 Q: How to get key of object pointed to by entry from entry? 1647 1648 A: Each directory entry has its header. This header has deh_dir_id and deh_objectid fields, those are key 1649 of object, entry points to */ 1650 1651 /* NOT IMPLEMENTED: 1652 Directory will someday contain stat data of object */ 1653 1654 struct reiserfs_de_head { 1655 __le32 deh_offset; /* third component of the directory entry key */ 1656 __le32 deh_dir_id; /* objectid of the parent directory of the object, that is referenced 1657 by directory entry */ 1658 __le32 deh_objectid; /* objectid of the object, that is referenced by directory entry */ 1659 __le16 deh_location; /* offset of name in the whole item */ 1660 __le16 deh_state; /* whether 1) entry contains stat data (for future), and 2) whether 1661 entry is hidden (unlinked) */ 1662 } __attribute__ ((__packed__)); 1663 #define DEH_SIZE sizeof(struct reiserfs_de_head) 1664 #define deh_offset(p_deh) (le32_to_cpu((p_deh)->deh_offset)) 1665 #define deh_dir_id(p_deh) (le32_to_cpu((p_deh)->deh_dir_id)) 1666 #define deh_objectid(p_deh) (le32_to_cpu((p_deh)->deh_objectid)) 1667 #define deh_location(p_deh) (le16_to_cpu((p_deh)->deh_location)) 1668 #define deh_state(p_deh) (le16_to_cpu((p_deh)->deh_state)) 1669 1670 #define put_deh_offset(p_deh,v) ((p_deh)->deh_offset = cpu_to_le32((v))) 1671 #define put_deh_dir_id(p_deh,v) ((p_deh)->deh_dir_id = cpu_to_le32((v))) 1672 #define put_deh_objectid(p_deh,v) ((p_deh)->deh_objectid = cpu_to_le32((v))) 1673 #define put_deh_location(p_deh,v) ((p_deh)->deh_location = cpu_to_le16((v))) 1674 #define put_deh_state(p_deh,v) ((p_deh)->deh_state = cpu_to_le16((v))) 1675 1676 /* empty directory contains two entries "." and ".." and their headers */ 1677 #define EMPTY_DIR_SIZE \ 1678 (DEH_SIZE * 2 + ROUND_UP (strlen (".")) + ROUND_UP (strlen (".."))) 1679 1680 /* old format directories have this size when empty */ 1681 #define EMPTY_DIR_SIZE_V1 (DEH_SIZE * 2 + 3) 1682 1683 #define DEH_Statdata 0 /* not used now */ 1684 #define DEH_Visible 2 1685 1686 /* 64 bit systems (and the S/390) need to be aligned explicitly -jdm */ 1687 #if BITS_PER_LONG == 64 || defined(__s390__) || defined(__hppa__) 1688 # define ADDR_UNALIGNED_BITS (3) 1689 #endif 1690 1691 /* These are only used to manipulate deh_state. 1692 * Because of this, we'll use the ext2_ bit routines, 1693 * since they are little endian */ 1694 #ifdef ADDR_UNALIGNED_BITS 1695 1696 # define aligned_address(addr) ((void *)((long)(addr) & ~((1UL << ADDR_UNALIGNED_BITS) - 1))) 1697 # define unaligned_offset(addr) (((int)((long)(addr) & ((1 << ADDR_UNALIGNED_BITS) - 1))) << 3) 1698 1699 # define set_bit_unaligned(nr, addr) \ 1700 __test_and_set_bit_le((nr) + unaligned_offset(addr), aligned_address(addr)) 1701 # define clear_bit_unaligned(nr, addr) \ 1702 __test_and_clear_bit_le((nr) + unaligned_offset(addr), aligned_address(addr)) 1703 # define test_bit_unaligned(nr, addr) \ 1704 test_bit_le((nr) + unaligned_offset(addr), aligned_address(addr)) 1705 1706 #else 1707 1708 # define set_bit_unaligned(nr, addr) __test_and_set_bit_le(nr, addr) 1709 # define clear_bit_unaligned(nr, addr) __test_and_clear_bit_le(nr, addr) 1710 # define test_bit_unaligned(nr, addr) test_bit_le(nr, addr) 1711 1712 #endif 1713 1714 #define mark_de_with_sd(deh) set_bit_unaligned (DEH_Statdata, &((deh)->deh_state)) 1715 #define mark_de_without_sd(deh) clear_bit_unaligned (DEH_Statdata, &((deh)->deh_state)) 1716 #define mark_de_visible(deh) set_bit_unaligned (DEH_Visible, &((deh)->deh_state)) 1717 #define mark_de_hidden(deh) clear_bit_unaligned (DEH_Visible, &((deh)->deh_state)) 1718 1719 #define de_with_sd(deh) test_bit_unaligned (DEH_Statdata, &((deh)->deh_state)) 1720 #define de_visible(deh) test_bit_unaligned (DEH_Visible, &((deh)->deh_state)) 1721 #define de_hidden(deh) !test_bit_unaligned (DEH_Visible, &((deh)->deh_state)) 1722 1723 extern void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid, 1724 __le32 par_dirid, __le32 par_objid); 1725 extern void make_empty_dir_item(char *body, __le32 dirid, __le32 objid, 1726 __le32 par_dirid, __le32 par_objid); 1727 1728 /* array of the entry headers */ 1729 /* get item body */ 1730 #define B_I_PITEM(bh,ih) ( (bh)->b_data + ih_location(ih) ) 1731 #define B_I_DEH(bh,ih) ((struct reiserfs_de_head *)(B_I_PITEM(bh,ih))) 1732 1733 /* length of the directory entry in directory item. This define 1734 calculates length of i-th directory entry using directory entry 1735 locations from dir entry head. When it calculates length of 0-th 1736 directory entry, it uses length of whole item in place of entry 1737 location of the non-existent following entry in the calculation. 1738 See picture above.*/ 1739 /* 1740 #define I_DEH_N_ENTRY_LENGTH(ih,deh,i) \ 1741 ((i) ? (deh_location((deh)-1) - deh_location((deh))) : (ih_item_len((ih)) - deh_location((deh)))) 1742 */ 1743 static inline int entry_length(const struct buffer_head *bh, 1744 const struct item_head *ih, int pos_in_item) 1745 { 1746 struct reiserfs_de_head *deh; 1747 1748 deh = B_I_DEH(bh, ih) + pos_in_item; 1749 if (pos_in_item) 1750 return deh_location(deh - 1) - deh_location(deh); 1751 1752 return ih_item_len(ih) - deh_location(deh); 1753 } 1754 1755 /* number of entries in the directory item, depends on ENTRY_COUNT being at the start of directory dynamic data. */ 1756 #define I_ENTRY_COUNT(ih) (ih_entry_count((ih))) 1757 1758 /* name by bh, ih and entry_num */ 1759 #define B_I_E_NAME(bh,ih,entry_num) ((char *)(bh->b_data + ih_location(ih) + deh_location(B_I_DEH(bh,ih)+(entry_num)))) 1760 1761 // two entries per block (at least) 1762 #define REISERFS_MAX_NAME(block_size) 255 1763 1764 /* this structure is used for operations on directory entries. It is 1765 not a disk structure. */ 1766 /* When reiserfs_find_entry or search_by_entry_key find directory 1767 entry, they return filled reiserfs_dir_entry structure */ 1768 struct reiserfs_dir_entry { 1769 struct buffer_head *de_bh; 1770 int de_item_num; 1771 struct item_head *de_ih; 1772 int de_entry_num; 1773 struct reiserfs_de_head *de_deh; 1774 int de_entrylen; 1775 int de_namelen; 1776 char *de_name; 1777 unsigned long *de_gen_number_bit_string; 1778 1779 __u32 de_dir_id; 1780 __u32 de_objectid; 1781 1782 struct cpu_key de_entry_key; 1783 }; 1784 1785 /* these defines are useful when a particular member of a reiserfs_dir_entry is needed */ 1786 1787 /* pointer to file name, stored in entry */ 1788 #define B_I_DEH_ENTRY_FILE_NAME(bh,ih,deh) (B_I_PITEM (bh, ih) + deh_location(deh)) 1789 1790 /* length of name */ 1791 #define I_DEH_N_ENTRY_FILE_NAME_LENGTH(ih,deh,entry_num) \ 1792 (I_DEH_N_ENTRY_LENGTH (ih, deh, entry_num) - (de_with_sd (deh) ? SD_SIZE : 0)) 1793 1794 /* hash value occupies bits from 7 up to 30 */ 1795 #define GET_HASH_VALUE(offset) ((offset) & 0x7fffff80LL) 1796 /* generation number occupies 7 bits starting from 0 up to 6 */ 1797 #define GET_GENERATION_NUMBER(offset) ((offset) & 0x7fLL) 1798 #define MAX_GENERATION_NUMBER 127 1799 1800 #define SET_GENERATION_NUMBER(offset,gen_number) (GET_HASH_VALUE(offset)|(gen_number)) 1801 1802 /* 1803 * Picture represents an internal node of the reiserfs tree 1804 * ______________________________________________________ 1805 * | | Array of | Array of | Free | 1806 * |block | keys | pointers | space | 1807 * | head | N | N+1 | | 1808 * |______|_______________|___________________|___________| 1809 */ 1810 1811 /***************************************************************************/ 1812 /* DISK CHILD */ 1813 /***************************************************************************/ 1814 /* Disk child pointer: The pointer from an internal node of the tree 1815 to a node that is on disk. */ 1816 struct disk_child { 1817 __le32 dc_block_number; /* Disk child's block number. */ 1818 __le16 dc_size; /* Disk child's used space. */ 1819 __le16 dc_reserved; 1820 }; 1821 1822 #define DC_SIZE (sizeof(struct disk_child)) 1823 #define dc_block_number(dc_p) (le32_to_cpu((dc_p)->dc_block_number)) 1824 #define dc_size(dc_p) (le16_to_cpu((dc_p)->dc_size)) 1825 #define put_dc_block_number(dc_p, val) do { (dc_p)->dc_block_number = cpu_to_le32(val); } while(0) 1826 #define put_dc_size(dc_p, val) do { (dc_p)->dc_size = cpu_to_le16(val); } while(0) 1827 1828 /* Get disk child by buffer header and position in the tree node. */ 1829 #define B_N_CHILD(bh, n_pos) ((struct disk_child *)\ 1830 ((bh)->b_data + BLKH_SIZE + B_NR_ITEMS(bh) * KEY_SIZE + DC_SIZE * (n_pos))) 1831 1832 /* Get disk child number by buffer header and position in the tree node. */ 1833 #define B_N_CHILD_NUM(bh, n_pos) (dc_block_number(B_N_CHILD(bh, n_pos))) 1834 #define PUT_B_N_CHILD_NUM(bh, n_pos, val) \ 1835 (put_dc_block_number(B_N_CHILD(bh, n_pos), val)) 1836 1837 /* maximal value of field child_size in structure disk_child */ 1838 /* child size is the combined size of all items and their headers */ 1839 #define MAX_CHILD_SIZE(bh) ((int)( (bh)->b_size - BLKH_SIZE )) 1840 1841 /* amount of used space in buffer (not including block head) */ 1842 #define B_CHILD_SIZE(cur) (MAX_CHILD_SIZE(cur)-(B_FREE_SPACE(cur))) 1843 1844 /* max and min number of keys in internal node */ 1845 #define MAX_NR_KEY(bh) ( (MAX_CHILD_SIZE(bh)-DC_SIZE)/(KEY_SIZE+DC_SIZE) ) 1846 #define MIN_NR_KEY(bh) (MAX_NR_KEY(bh)/2) 1847 1848 /***************************************************************************/ 1849 /* PATH STRUCTURES AND DEFINES */ 1850 /***************************************************************************/ 1851 1852 /* Search_by_key fills up the path from the root to the leaf as it descends the tree looking for the 1853 key. It uses reiserfs_bread to try to find buffers in the cache given their block number. If it 1854 does not find them in the cache it reads them from disk. For each node search_by_key finds using 1855 reiserfs_bread it then uses bin_search to look through that node. bin_search will find the 1856 position of the block_number of the next node if it is looking through an internal node. If it 1857 is looking through a leaf node bin_search will find the position of the item which has key either 1858 equal to given key, or which is the maximal key less than the given key. */ 1859 1860 struct path_element { 1861 struct buffer_head *pe_buffer; /* Pointer to the buffer at the path in the tree. */ 1862 int pe_position; /* Position in the tree node which is placed in the */ 1863 /* buffer above. */ 1864 }; 1865 1866 #define MAX_HEIGHT 5 /* maximal height of a tree. don't change this without changing JOURNAL_PER_BALANCE_CNT */ 1867 #define EXTENDED_MAX_HEIGHT 7 /* Must be equals MAX_HEIGHT + FIRST_PATH_ELEMENT_OFFSET */ 1868 #define FIRST_PATH_ELEMENT_OFFSET 2 /* Must be equal to at least 2. */ 1869 1870 #define ILLEGAL_PATH_ELEMENT_OFFSET 1 /* Must be equal to FIRST_PATH_ELEMENT_OFFSET - 1 */ 1871 #define MAX_FEB_SIZE 6 /* this MUST be MAX_HEIGHT + 1. See about FEB below */ 1872 1873 /* We need to keep track of who the ancestors of nodes are. When we 1874 perform a search we record which nodes were visited while 1875 descending the tree looking for the node we searched for. This list 1876 of nodes is called the path. This information is used while 1877 performing balancing. Note that this path information may become 1878 invalid, and this means we must check it when using it to see if it 1879 is still valid. You'll need to read search_by_key and the comments 1880 in it, especially about decrement_counters_in_path(), to understand 1881 this structure. 1882 1883 Paths make the code so much harder to work with and debug.... An 1884 enormous number of bugs are due to them, and trying to write or modify 1885 code that uses them just makes my head hurt. They are based on an 1886 excessive effort to avoid disturbing the precious VFS code.:-( The 1887 gods only know how we are going to SMP the code that uses them. 1888 znodes are the way! */ 1889 1890 #define PATH_READA 0x1 /* do read ahead */ 1891 #define PATH_READA_BACK 0x2 /* read backwards */ 1892 1893 struct treepath { 1894 int path_length; /* Length of the array above. */ 1895 int reada; 1896 struct path_element path_elements[EXTENDED_MAX_HEIGHT]; /* Array of the path elements. */ 1897 int pos_in_item; 1898 }; 1899 1900 #define pos_in_item(path) ((path)->pos_in_item) 1901 1902 #define INITIALIZE_PATH(var) \ 1903 struct treepath var = {.path_length = ILLEGAL_PATH_ELEMENT_OFFSET, .reada = 0,} 1904 1905 /* Get path element by path and path position. */ 1906 #define PATH_OFFSET_PELEMENT(path, n_offset) ((path)->path_elements + (n_offset)) 1907 1908 /* Get buffer header at the path by path and path position. */ 1909 #define PATH_OFFSET_PBUFFER(path, n_offset) (PATH_OFFSET_PELEMENT(path, n_offset)->pe_buffer) 1910 1911 /* Get position in the element at the path by path and path position. */ 1912 #define PATH_OFFSET_POSITION(path, n_offset) (PATH_OFFSET_PELEMENT(path, n_offset)->pe_position) 1913 1914 #define PATH_PLAST_BUFFER(path) (PATH_OFFSET_PBUFFER((path), (path)->path_length)) 1915 /* you know, to the person who didn't 1916 write this the macro name does not 1917 at first suggest what it does. 1918 Maybe POSITION_FROM_PATH_END? Or 1919 maybe we should just focus on 1920 dumping paths... -Hans */ 1921 #define PATH_LAST_POSITION(path) (PATH_OFFSET_POSITION((path), (path)->path_length)) 1922 1923 #define PATH_PITEM_HEAD(path) B_N_PITEM_HEAD(PATH_PLAST_BUFFER(path), PATH_LAST_POSITION(path)) 1924 1925 /* in do_balance leaf has h == 0 in contrast with path structure, 1926 where root has level == 0. That is why we need these defines */ 1927 #define PATH_H_PBUFFER(path, h) PATH_OFFSET_PBUFFER (path, path->path_length - (h)) /* tb->S[h] */ 1928 #define PATH_H_PPARENT(path, h) PATH_H_PBUFFER (path, (h) + 1) /* tb->F[h] or tb->S[0]->b_parent */ 1929 #define PATH_H_POSITION(path, h) PATH_OFFSET_POSITION (path, path->path_length - (h)) 1930 #define PATH_H_B_ITEM_ORDER(path, h) PATH_H_POSITION(path, h + 1) /* tb->S[h]->b_item_order */ 1931 1932 #define PATH_H_PATH_OFFSET(path, n_h) ((path)->path_length - (n_h)) 1933 1934 #define get_last_bh(path) PATH_PLAST_BUFFER(path) 1935 #define get_ih(path) PATH_PITEM_HEAD(path) 1936 #define get_item_pos(path) PATH_LAST_POSITION(path) 1937 #define get_item(path) ((void *)B_N_PITEM(PATH_PLAST_BUFFER(path), PATH_LAST_POSITION (path))) 1938 #define item_moved(ih,path) comp_items(ih, path) 1939 #define path_changed(ih,path) comp_items (ih, path) 1940 1941 /***************************************************************************/ 1942 /* MISC */ 1943 /***************************************************************************/ 1944 1945 /* Size of pointer to the unformatted node. */ 1946 #define UNFM_P_SIZE (sizeof(unp_t)) 1947 #define UNFM_P_SHIFT 2 1948 1949 // in in-core inode key is stored on le form 1950 #define INODE_PKEY(inode) ((struct reiserfs_key *)(REISERFS_I(inode)->i_key)) 1951 1952 #define MAX_UL_INT 0xffffffff 1953 #define MAX_INT 0x7ffffff 1954 #define MAX_US_INT 0xffff 1955 1956 // reiserfs version 2 has max offset 60 bits. Version 1 - 32 bit offset 1957 #define U32_MAX (~(__u32)0) 1958 1959 static inline loff_t max_reiserfs_offset(struct inode *inode) 1960 { 1961 if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5) 1962 return (loff_t) U32_MAX; 1963 1964 return (loff_t) ((~(__u64) 0) >> 4); 1965 } 1966 1967 /*#define MAX_KEY_UNIQUENESS MAX_UL_INT*/ 1968 #define MAX_KEY_OBJECTID MAX_UL_INT 1969 1970 #define MAX_B_NUM MAX_UL_INT 1971 #define MAX_FC_NUM MAX_US_INT 1972 1973 /* the purpose is to detect overflow of an unsigned short */ 1974 #define REISERFS_LINK_MAX (MAX_US_INT - 1000) 1975 1976 /* The following defines are used in reiserfs_insert_item and reiserfs_append_item */ 1977 #define REISERFS_KERNEL_MEM 0 /* reiserfs kernel memory mode */ 1978 #define REISERFS_USER_MEM 1 /* reiserfs user memory mode */ 1979 1980 #define fs_generation(s) (REISERFS_SB(s)->s_generation_counter) 1981 #define get_generation(s) atomic_read (&fs_generation(s)) 1982 #define FILESYSTEM_CHANGED_TB(tb) (get_generation((tb)->tb_sb) != (tb)->fs_gen) 1983 #define __fs_changed(gen,s) (gen != get_generation (s)) 1984 #define fs_changed(gen,s) \ 1985 ({ \ 1986 reiserfs_cond_resched(s); \ 1987 __fs_changed(gen, s); \ 1988 }) 1989 1990 /***************************************************************************/ 1991 /* FIXATE NODES */ 1992 /***************************************************************************/ 1993 1994 #define VI_TYPE_LEFT_MERGEABLE 1 1995 #define VI_TYPE_RIGHT_MERGEABLE 2 1996 1997 /* To make any changes in the tree we always first find node, that 1998 contains item to be changed/deleted or place to insert a new 1999 item. We call this node S. To do balancing we need to decide what 2000 we will shift to left/right neighbor, or to a new node, where new 2001 item will be etc. To make this analysis simpler we build virtual 2002 node. Virtual node is an array of items, that will replace items of 2003 node S. (For instance if we are going to delete an item, virtual 2004 node does not contain it). Virtual node keeps information about 2005 item sizes and types, mergeability of first and last items, sizes 2006 of all entries in directory item. We use this array of items when 2007 calculating what we can shift to neighbors and how many nodes we 2008 have to have if we do not any shiftings, if we shift to left/right 2009 neighbor or to both. */ 2010 struct virtual_item { 2011 int vi_index; // index in the array of item operations 2012 unsigned short vi_type; // left/right mergeability 2013 unsigned short vi_item_len; /* length of item that it will have after balancing */ 2014 struct item_head *vi_ih; 2015 const char *vi_item; // body of item (old or new) 2016 const void *vi_new_data; // 0 always but paste mode 2017 void *vi_uarea; // item specific area 2018 }; 2019 2020 struct virtual_node { 2021 char *vn_free_ptr; /* this is a pointer to the free space in the buffer */ 2022 unsigned short vn_nr_item; /* number of items in virtual node */ 2023 short vn_size; /* size of node , that node would have if it has unlimited size and no balancing is performed */ 2024 short vn_mode; /* mode of balancing (paste, insert, delete, cut) */ 2025 short vn_affected_item_num; 2026 short vn_pos_in_item; 2027 struct item_head *vn_ins_ih; /* item header of inserted item, 0 for other modes */ 2028 const void *vn_data; 2029 struct virtual_item *vn_vi; /* array of items (including a new one, excluding item to be deleted) */ 2030 }; 2031 2032 /* used by directory items when creating virtual nodes */ 2033 struct direntry_uarea { 2034 int flags; 2035 __u16 entry_count; 2036 __u16 entry_sizes[1]; 2037 } __attribute__ ((__packed__)); 2038 2039 /***************************************************************************/ 2040 /* TREE BALANCE */ 2041 /***************************************************************************/ 2042 2043 /* This temporary structure is used in tree balance algorithms, and 2044 constructed as we go to the extent that its various parts are 2045 needed. It contains arrays of nodes that can potentially be 2046 involved in the balancing of node S, and parameters that define how 2047 each of the nodes must be balanced. Note that in these algorithms 2048 for balancing the worst case is to need to balance the current node 2049 S and the left and right neighbors and all of their parents plus 2050 create a new node. We implement S1 balancing for the leaf nodes 2051 and S0 balancing for the internal nodes (S1 and S0 are defined in 2052 our papers.)*/ 2053 2054 #define MAX_FREE_BLOCK 7 /* size of the array of buffers to free at end of do_balance */ 2055 2056 /* maximum number of FEB blocknrs on a single level */ 2057 #define MAX_AMOUNT_NEEDED 2 2058 2059 /* someday somebody will prefix every field in this struct with tb_ */ 2060 struct tree_balance { 2061 int tb_mode; 2062 int need_balance_dirty; 2063 struct super_block *tb_sb; 2064 struct reiserfs_transaction_handle *transaction_handle; 2065 struct treepath *tb_path; 2066 struct buffer_head *L[MAX_HEIGHT]; /* array of left neighbors of nodes in the path */ 2067 struct buffer_head *R[MAX_HEIGHT]; /* array of right neighbors of nodes in the path */ 2068 struct buffer_head *FL[MAX_HEIGHT]; /* array of fathers of the left neighbors */ 2069 struct buffer_head *FR[MAX_HEIGHT]; /* array of fathers of the right neighbors */ 2070 struct buffer_head *CFL[MAX_HEIGHT]; /* array of common parents of center node and its left neighbor */ 2071 struct buffer_head *CFR[MAX_HEIGHT]; /* array of common parents of center node and its right neighbor */ 2072 2073 struct buffer_head *FEB[MAX_FEB_SIZE]; /* array of empty buffers. Number of buffers in array equals 2074 cur_blknum. */ 2075 struct buffer_head *used[MAX_FEB_SIZE]; 2076 struct buffer_head *thrown[MAX_FEB_SIZE]; 2077 int lnum[MAX_HEIGHT]; /* array of number of items which must be 2078 shifted to the left in order to balance the 2079 current node; for leaves includes item that 2080 will be partially shifted; for internal 2081 nodes, it is the number of child pointers 2082 rather than items. It includes the new item 2083 being created. The code sometimes subtracts 2084 one to get the number of wholly shifted 2085 items for other purposes. */ 2086 int rnum[MAX_HEIGHT]; /* substitute right for left in comment above */ 2087 int lkey[MAX_HEIGHT]; /* array indexed by height h mapping the key delimiting L[h] and 2088 S[h] to its item number within the node CFL[h] */ 2089 int rkey[MAX_HEIGHT]; /* substitute r for l in comment above */ 2090 int insert_size[MAX_HEIGHT]; /* the number of bytes by we are trying to add or remove from 2091 S[h]. A negative value means removing. */ 2092 int blknum[MAX_HEIGHT]; /* number of nodes that will replace node S[h] after 2093 balancing on the level h of the tree. If 0 then S is 2094 being deleted, if 1 then S is remaining and no new nodes 2095 are being created, if 2 or 3 then 1 or 2 new nodes is 2096 being created */ 2097 2098 /* fields that are used only for balancing leaves of the tree */ 2099 int cur_blknum; /* number of empty blocks having been already allocated */ 2100 int s0num; /* number of items that fall into left most node when S[0] splits */ 2101 int s1num; /* number of items that fall into first new node when S[0] splits */ 2102 int s2num; /* number of items that fall into second new node when S[0] splits */ 2103 int lbytes; /* number of bytes which can flow to the left neighbor from the left */ 2104 /* most liquid item that cannot be shifted from S[0] entirely */ 2105 /* if -1 then nothing will be partially shifted */ 2106 int rbytes; /* number of bytes which will flow to the right neighbor from the right */ 2107 /* most liquid item that cannot be shifted from S[0] entirely */ 2108 /* if -1 then nothing will be partially shifted */ 2109 int s1bytes; /* number of bytes which flow to the first new node when S[0] splits */ 2110 /* note: if S[0] splits into 3 nodes, then items do not need to be cut */ 2111 int s2bytes; 2112 struct buffer_head *buf_to_free[MAX_FREE_BLOCK]; /* buffers which are to be freed after do_balance finishes by unfix_nodes */ 2113 char *vn_buf; /* kmalloced memory. Used to create 2114 virtual node and keep map of 2115 dirtied bitmap blocks */ 2116 int vn_buf_size; /* size of the vn_buf */ 2117 struct virtual_node *tb_vn; /* VN starts after bitmap of bitmap blocks */ 2118 2119 int fs_gen; /* saved value of `reiserfs_generation' counter 2120 see FILESYSTEM_CHANGED() macro in reiserfs_fs.h */ 2121 #ifdef DISPLACE_NEW_PACKING_LOCALITIES 2122 struct in_core_key key; /* key pointer, to pass to block allocator or 2123 another low-level subsystem */ 2124 #endif 2125 }; 2126 2127 /* These are modes of balancing */ 2128 2129 /* When inserting an item. */ 2130 #define M_INSERT 'i' 2131 /* When inserting into (directories only) or appending onto an already 2132 existent item. */ 2133 #define M_PASTE 'p' 2134 /* When deleting an item. */ 2135 #define M_DELETE 'd' 2136 /* When truncating an item or removing an entry from a (directory) item. */ 2137 #define M_CUT 'c' 2138 2139 /* used when balancing on leaf level skipped (in reiserfsck) */ 2140 #define M_INTERNAL 'n' 2141 2142 /* When further balancing is not needed, then do_balance does not need 2143 to be called. */ 2144 #define M_SKIP_BALANCING 's' 2145 #define M_CONVERT 'v' 2146 2147 /* modes of leaf_move_items */ 2148 #define LEAF_FROM_S_TO_L 0 2149 #define LEAF_FROM_S_TO_R 1 2150 #define LEAF_FROM_R_TO_L 2 2151 #define LEAF_FROM_L_TO_R 3 2152 #define LEAF_FROM_S_TO_SNEW 4 2153 2154 #define FIRST_TO_LAST 0 2155 #define LAST_TO_FIRST 1 2156 2157 /* used in do_balance for passing parent of node information that has 2158 been gotten from tb struct */ 2159 struct buffer_info { 2160 struct tree_balance *tb; 2161 struct buffer_head *bi_bh; 2162 struct buffer_head *bi_parent; 2163 int bi_position; 2164 }; 2165 2166 static inline struct super_block *sb_from_tb(struct tree_balance *tb) 2167 { 2168 return tb ? tb->tb_sb : NULL; 2169 } 2170 2171 static inline struct super_block *sb_from_bi(struct buffer_info *bi) 2172 { 2173 return bi ? sb_from_tb(bi->tb) : NULL; 2174 } 2175 2176 /* there are 4 types of items: stat data, directory item, indirect, direct. 2177 +-------------------+------------+--------------+------------+ 2178 | | k_offset | k_uniqueness | mergeable? | 2179 +-------------------+------------+--------------+------------+ 2180 | stat data | 0 | 0 | no | 2181 +-------------------+------------+--------------+------------+ 2182 | 1st directory item| DOT_OFFSET |DIRENTRY_UNIQUENESS| no | 2183 | non 1st directory | hash value | | yes | 2184 | item | | | | 2185 +-------------------+------------+--------------+------------+ 2186 | indirect item | offset + 1 |TYPE_INDIRECT | if this is not the first indirect item of the object 2187 +-------------------+------------+--------------+------------+ 2188 | direct item | offset + 1 |TYPE_DIRECT | if not this is not the first direct item of the object 2189 +-------------------+------------+--------------+------------+ 2190 */ 2191 2192 struct item_operations { 2193 int (*bytes_number) (struct item_head * ih, int block_size); 2194 void (*decrement_key) (struct cpu_key *); 2195 int (*is_left_mergeable) (struct reiserfs_key * ih, 2196 unsigned long bsize); 2197 void (*print_item) (struct item_head *, char *item); 2198 void (*check_item) (struct item_head *, char *item); 2199 2200 int (*create_vi) (struct virtual_node * vn, struct virtual_item * vi, 2201 int is_affected, int insert_size); 2202 int (*check_left) (struct virtual_item * vi, int free, 2203 int start_skip, int end_skip); 2204 int (*check_right) (struct virtual_item * vi, int free); 2205 int (*part_size) (struct virtual_item * vi, int from, int to); 2206 int (*unit_num) (struct virtual_item * vi); 2207 void (*print_vi) (struct virtual_item * vi); 2208 }; 2209 2210 extern struct item_operations *item_ops[TYPE_ANY + 1]; 2211 2212 #define op_bytes_number(ih,bsize) item_ops[le_ih_k_type (ih)]->bytes_number (ih, bsize) 2213 #define op_is_left_mergeable(key,bsize) item_ops[le_key_k_type (le_key_version (key), key)]->is_left_mergeable (key, bsize) 2214 #define op_print_item(ih,item) item_ops[le_ih_k_type (ih)]->print_item (ih, item) 2215 #define op_check_item(ih,item) item_ops[le_ih_k_type (ih)]->check_item (ih, item) 2216 #define op_create_vi(vn,vi,is_affected,insert_size) item_ops[le_ih_k_type ((vi)->vi_ih)]->create_vi (vn,vi,is_affected,insert_size) 2217 #define op_check_left(vi,free,start_skip,end_skip) item_ops[(vi)->vi_index]->check_left (vi, free, start_skip, end_skip) 2218 #define op_check_right(vi,free) item_ops[(vi)->vi_index]->check_right (vi, free) 2219 #define op_part_size(vi,from,to) item_ops[(vi)->vi_index]->part_size (vi, from, to) 2220 #define op_unit_num(vi) item_ops[(vi)->vi_index]->unit_num (vi) 2221 #define op_print_vi(vi) item_ops[(vi)->vi_index]->print_vi (vi) 2222 2223 #define COMP_SHORT_KEYS comp_short_keys 2224 2225 /* number of blocks pointed to by the indirect item */ 2226 #define I_UNFM_NUM(ih) (ih_item_len(ih) / UNFM_P_SIZE) 2227 2228 /* the used space within the unformatted node corresponding to pos within the item pointed to by ih */ 2229 #define I_POS_UNFM_SIZE(ih,pos,size) (((pos) == I_UNFM_NUM(ih) - 1 ) ? (size) - ih_free_space(ih) : (size)) 2230 2231 /* number of bytes contained by the direct item or the unformatted nodes the indirect item points to */ 2232 2233 /* get the item header */ 2234 #define B_N_PITEM_HEAD(bh,item_num) ( (struct item_head * )((bh)->b_data + BLKH_SIZE) + (item_num) ) 2235 2236 /* get key */ 2237 #define B_N_PDELIM_KEY(bh,item_num) ( (struct reiserfs_key * )((bh)->b_data + BLKH_SIZE) + (item_num) ) 2238 2239 /* get the key */ 2240 #define B_N_PKEY(bh,item_num) ( &(B_N_PITEM_HEAD(bh,item_num)->ih_key) ) 2241 2242 /* get item body */ 2243 #define B_N_PITEM(bh,item_num) ( (bh)->b_data + ih_location(B_N_PITEM_HEAD((bh),(item_num)))) 2244 2245 /* get the stat data by the buffer header and the item order */ 2246 #define B_N_STAT_DATA(bh,nr) \ 2247 ( (struct stat_data *)((bh)->b_data + ih_location(B_N_PITEM_HEAD((bh),(nr))) ) ) 2248 2249 /* following defines use reiserfs buffer header and item header */ 2250 2251 /* get stat-data */ 2252 #define B_I_STAT_DATA(bh, ih) ( (struct stat_data * )((bh)->b_data + ih_location(ih)) ) 2253 2254 // this is 3976 for size==4096 2255 #define MAX_DIRECT_ITEM_LEN(size) ((size) - BLKH_SIZE - 2*IH_SIZE - SD_SIZE - UNFM_P_SIZE) 2256 2257 /* indirect items consist of entries which contain blocknrs, pos 2258 indicates which entry, and B_I_POS_UNFM_POINTER resolves to the 2259 blocknr contained by the entry pos points to */ 2260 #define B_I_POS_UNFM_POINTER(bh,ih,pos) le32_to_cpu(*(((unp_t *)B_I_PITEM(bh,ih)) + (pos))) 2261 #define PUT_B_I_POS_UNFM_POINTER(bh,ih,pos, val) do {*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)) = cpu_to_le32(val); } while (0) 2262 2263 struct reiserfs_iget_args { 2264 __u32 objectid; 2265 __u32 dirid; 2266 }; 2267 2268 /***************************************************************************/ 2269 /* FUNCTION DECLARATIONS */ 2270 /***************************************************************************/ 2271 2272 #define get_journal_desc_magic(bh) (bh->b_data + bh->b_size - 12) 2273 2274 #define journal_trans_half(blocksize) \ 2275 ((blocksize - sizeof (struct reiserfs_journal_desc) + sizeof (__u32) - 12) / sizeof (__u32)) 2276 2277 /* journal.c see journal.c for all the comments here */ 2278 2279 /* first block written in a commit. */ 2280 struct reiserfs_journal_desc { 2281 __le32 j_trans_id; /* id of commit */ 2282 __le32 j_len; /* length of commit. len +1 is the commit block */ 2283 __le32 j_mount_id; /* mount id of this trans */ 2284 __le32 j_realblock[1]; /* real locations for each block */ 2285 }; 2286 2287 #define get_desc_trans_id(d) le32_to_cpu((d)->j_trans_id) 2288 #define get_desc_trans_len(d) le32_to_cpu((d)->j_len) 2289 #define get_desc_mount_id(d) le32_to_cpu((d)->j_mount_id) 2290 2291 #define set_desc_trans_id(d,val) do { (d)->j_trans_id = cpu_to_le32 (val); } while (0) 2292 #define set_desc_trans_len(d,val) do { (d)->j_len = cpu_to_le32 (val); } while (0) 2293 #define set_desc_mount_id(d,val) do { (d)->j_mount_id = cpu_to_le32 (val); } while (0) 2294 2295 /* last block written in a commit */ 2296 struct reiserfs_journal_commit { 2297 __le32 j_trans_id; /* must match j_trans_id from the desc block */ 2298 __le32 j_len; /* ditto */ 2299 __le32 j_realblock[1]; /* real locations for each block */ 2300 }; 2301 2302 #define get_commit_trans_id(c) le32_to_cpu((c)->j_trans_id) 2303 #define get_commit_trans_len(c) le32_to_cpu((c)->j_len) 2304 #define get_commit_mount_id(c) le32_to_cpu((c)->j_mount_id) 2305 2306 #define set_commit_trans_id(c,val) do { (c)->j_trans_id = cpu_to_le32 (val); } while (0) 2307 #define set_commit_trans_len(c,val) do { (c)->j_len = cpu_to_le32 (val); } while (0) 2308 2309 /* this header block gets written whenever a transaction is considered fully flushed, and is more recent than the 2310 ** last fully flushed transaction. fully flushed means all the log blocks and all the real blocks are on disk, 2311 ** and this transaction does not need to be replayed. 2312 */ 2313 struct reiserfs_journal_header { 2314 __le32 j_last_flush_trans_id; /* id of last fully flushed transaction */ 2315 __le32 j_first_unflushed_offset; /* offset in the log of where to start replay after a crash */ 2316 __le32 j_mount_id; 2317 /* 12 */ struct journal_params jh_journal; 2318 }; 2319 2320 /* biggest tunable defines are right here */ 2321 #define JOURNAL_BLOCK_COUNT 8192 /* number of blocks in the journal */ 2322 #define JOURNAL_TRANS_MAX_DEFAULT 1024 /* biggest possible single transaction, don't change for now (8/3/99) */ 2323 #define JOURNAL_TRANS_MIN_DEFAULT 256 2324 #define JOURNAL_MAX_BATCH_DEFAULT 900 /* max blocks to batch into one transaction, don't make this any bigger than 900 */ 2325 #define JOURNAL_MIN_RATIO 2 2326 #define JOURNAL_MAX_COMMIT_AGE 30 2327 #define JOURNAL_MAX_TRANS_AGE 30 2328 #define JOURNAL_PER_BALANCE_CNT (3 * (MAX_HEIGHT-2) + 9) 2329 #define JOURNAL_BLOCKS_PER_OBJECT(sb) (JOURNAL_PER_BALANCE_CNT * 3 + \ 2330 2 * (REISERFS_QUOTA_INIT_BLOCKS(sb) + \ 2331 REISERFS_QUOTA_TRANS_BLOCKS(sb))) 2332 2333 #ifdef CONFIG_QUOTA 2334 #define REISERFS_QUOTA_OPTS ((1 << REISERFS_USRQUOTA) | (1 << REISERFS_GRPQUOTA)) 2335 /* We need to update data and inode (atime) */ 2336 #define REISERFS_QUOTA_TRANS_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & REISERFS_QUOTA_OPTS ? 2 : 0) 2337 /* 1 balancing, 1 bitmap, 1 data per write + stat data update */ 2338 #define REISERFS_QUOTA_INIT_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & REISERFS_QUOTA_OPTS ? \ 2339 (DQUOT_INIT_ALLOC*(JOURNAL_PER_BALANCE_CNT+2)+DQUOT_INIT_REWRITE+1) : 0) 2340 /* same as with INIT */ 2341 #define REISERFS_QUOTA_DEL_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & REISERFS_QUOTA_OPTS ? \ 2342 (DQUOT_DEL_ALLOC*(JOURNAL_PER_BALANCE_CNT+2)+DQUOT_DEL_REWRITE+1) : 0) 2343 #else 2344 #define REISERFS_QUOTA_TRANS_BLOCKS(s) 0 2345 #define REISERFS_QUOTA_INIT_BLOCKS(s) 0 2346 #define REISERFS_QUOTA_DEL_BLOCKS(s) 0 2347 #endif 2348 2349 /* both of these can be as low as 1, or as high as you want. The min is the 2350 ** number of 4k bitmap nodes preallocated on mount. New nodes are allocated 2351 ** as needed, and released when transactions are committed. On release, if 2352 ** the current number of nodes is > max, the node is freed, otherwise, 2353 ** it is put on a free list for faster use later. 2354 */ 2355 #define REISERFS_MIN_BITMAP_NODES 10 2356 #define REISERFS_MAX_BITMAP_NODES 100 2357 2358 #define JBH_HASH_SHIFT 13 /* these are based on journal hash size of 8192 */ 2359 #define JBH_HASH_MASK 8191 2360 2361 #define _jhashfn(sb,block) \ 2362 (((unsigned long)sb>>L1_CACHE_SHIFT) ^ \ 2363 (((block)<<(JBH_HASH_SHIFT - 6)) ^ ((block) >> 13) ^ ((block) << (JBH_HASH_SHIFT - 12)))) 2364 #define journal_hash(t,sb,block) ((t)[_jhashfn((sb),(block)) & JBH_HASH_MASK]) 2365 2366 // We need these to make journal.c code more readable 2367 #define journal_find_get_block(s, block) __find_get_block(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize) 2368 #define journal_getblk(s, block) __getblk(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize) 2369 #define journal_bread(s, block) __bread(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize) 2370 2371 enum reiserfs_bh_state_bits { 2372 BH_JDirty = BH_PrivateStart, /* buffer is in current transaction */ 2373 BH_JDirty_wait, 2374 BH_JNew, /* disk block was taken off free list before 2375 * being in a finished transaction, or 2376 * written to disk. Can be reused immed. */ 2377 BH_JPrepared, 2378 BH_JRestore_dirty, 2379 BH_JTest, // debugging only will go away 2380 }; 2381 2382 BUFFER_FNS(JDirty, journaled); 2383 TAS_BUFFER_FNS(JDirty, journaled); 2384 BUFFER_FNS(JDirty_wait, journal_dirty); 2385 TAS_BUFFER_FNS(JDirty_wait, journal_dirty); 2386 BUFFER_FNS(JNew, journal_new); 2387 TAS_BUFFER_FNS(JNew, journal_new); 2388 BUFFER_FNS(JPrepared, journal_prepared); 2389 TAS_BUFFER_FNS(JPrepared, journal_prepared); 2390 BUFFER_FNS(JRestore_dirty, journal_restore_dirty); 2391 TAS_BUFFER_FNS(JRestore_dirty, journal_restore_dirty); 2392 BUFFER_FNS(JTest, journal_test); 2393 TAS_BUFFER_FNS(JTest, journal_test); 2394 2395 /* 2396 ** transaction handle which is passed around for all journal calls 2397 */ 2398 struct reiserfs_transaction_handle { 2399 struct super_block *t_super; /* super for this FS when journal_begin was 2400 called. saves calls to reiserfs_get_super 2401 also used by nested transactions to make 2402 sure they are nesting on the right FS 2403 _must_ be first in the handle 2404 */ 2405 int t_refcount; 2406 int t_blocks_logged; /* number of blocks this writer has logged */ 2407 int t_blocks_allocated; /* number of blocks this writer allocated */ 2408 unsigned int t_trans_id; /* sanity check, equals the current trans id */ 2409 void *t_handle_save; /* save existing current->journal_info */ 2410 unsigned displace_new_blocks:1; /* if new block allocation occurres, that block 2411 should be displaced from others */ 2412 struct list_head t_list; 2413 }; 2414 2415 /* used to keep track of ordered and tail writes, attached to the buffer 2416 * head through b_journal_head. 2417 */ 2418 struct reiserfs_jh { 2419 struct reiserfs_journal_list *jl; 2420 struct buffer_head *bh; 2421 struct list_head list; 2422 }; 2423 2424 void reiserfs_free_jh(struct buffer_head *bh); 2425 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh); 2426 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh); 2427 int journal_mark_dirty(struct reiserfs_transaction_handle *, 2428 struct super_block *, struct buffer_head *bh); 2429 2430 static inline int reiserfs_file_data_log(struct inode *inode) 2431 { 2432 if (reiserfs_data_log(inode->i_sb) || 2433 (REISERFS_I(inode)->i_flags & i_data_log)) 2434 return 1; 2435 return 0; 2436 } 2437 2438 static inline int reiserfs_transaction_running(struct super_block *s) 2439 { 2440 struct reiserfs_transaction_handle *th = current->journal_info; 2441 if (th && th->t_super == s) 2442 return 1; 2443 if (th && th->t_super == NULL) 2444 BUG(); 2445 return 0; 2446 } 2447 2448 static inline int reiserfs_transaction_free_space(struct reiserfs_transaction_handle *th) 2449 { 2450 return th->t_blocks_allocated - th->t_blocks_logged; 2451 } 2452 2453 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct 2454 super_block 2455 *, 2456 int count); 2457 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *); 2458 int reiserfs_commit_page(struct inode *inode, struct page *page, 2459 unsigned from, unsigned to); 2460 void reiserfs_flush_old_commits(struct super_block *); 2461 int reiserfs_commit_for_inode(struct inode *); 2462 int reiserfs_inode_needs_commit(struct inode *); 2463 void reiserfs_update_inode_transaction(struct inode *); 2464 void reiserfs_wait_on_write_block(struct super_block *s); 2465 void reiserfs_block_writes(struct reiserfs_transaction_handle *th); 2466 void reiserfs_allow_writes(struct super_block *s); 2467 void reiserfs_check_lock_depth(struct super_block *s, char *caller); 2468 int reiserfs_prepare_for_journal(struct super_block *, struct buffer_head *bh, 2469 int wait); 2470 void reiserfs_restore_prepared_buffer(struct super_block *, 2471 struct buffer_head *bh); 2472 int journal_init(struct super_block *, const char *j_dev_name, int old_format, 2473 unsigned int); 2474 int journal_release(struct reiserfs_transaction_handle *, struct super_block *); 2475 int journal_release_error(struct reiserfs_transaction_handle *, 2476 struct super_block *); 2477 int journal_end(struct reiserfs_transaction_handle *, struct super_block *, 2478 unsigned long); 2479 int journal_end_sync(struct reiserfs_transaction_handle *, struct super_block *, 2480 unsigned long); 2481 int journal_mark_freed(struct reiserfs_transaction_handle *, 2482 struct super_block *, b_blocknr_t blocknr); 2483 int journal_transaction_should_end(struct reiserfs_transaction_handle *, int); 2484 int reiserfs_in_journal(struct super_block *sb, unsigned int bmap_nr, 2485 int bit_nr, int searchall, b_blocknr_t *next); 2486 int journal_begin(struct reiserfs_transaction_handle *, 2487 struct super_block *sb, unsigned long); 2488 int journal_join_abort(struct reiserfs_transaction_handle *, 2489 struct super_block *sb, unsigned long); 2490 void reiserfs_abort_journal(struct super_block *sb, int errno); 2491 void reiserfs_abort(struct super_block *sb, int errno, const char *fmt, ...); 2492 int reiserfs_allocate_list_bitmaps(struct super_block *s, 2493 struct reiserfs_list_bitmap *, unsigned int); 2494 2495 void reiserfs_schedule_old_flush(struct super_block *s); 2496 void add_save_link(struct reiserfs_transaction_handle *th, 2497 struct inode *inode, int truncate); 2498 int remove_save_link(struct inode *inode, int truncate); 2499 2500 /* objectid.c */ 2501 __u32 reiserfs_get_unused_objectid(struct reiserfs_transaction_handle *th); 2502 void reiserfs_release_objectid(struct reiserfs_transaction_handle *th, 2503 __u32 objectid_to_release); 2504 int reiserfs_convert_objectid_map_v1(struct super_block *); 2505 2506 /* stree.c */ 2507 int B_IS_IN_TREE(const struct buffer_head *); 2508 extern void copy_item_head(struct item_head *to, 2509 const struct item_head *from); 2510 2511 // first key is in cpu form, second - le 2512 extern int comp_short_keys(const struct reiserfs_key *le_key, 2513 const struct cpu_key *cpu_key); 2514 extern void le_key2cpu_key(struct cpu_key *to, const struct reiserfs_key *from); 2515 2516 // both are in le form 2517 extern int comp_le_keys(const struct reiserfs_key *, 2518 const struct reiserfs_key *); 2519 extern int comp_short_le_keys(const struct reiserfs_key *, 2520 const struct reiserfs_key *); 2521 2522 // 2523 // get key version from on disk key - kludge 2524 // 2525 static inline int le_key_version(const struct reiserfs_key *key) 2526 { 2527 int type; 2528 2529 type = offset_v2_k_type(&(key->u.k_offset_v2)); 2530 if (type != TYPE_DIRECT && type != TYPE_INDIRECT 2531 && type != TYPE_DIRENTRY) 2532 return KEY_FORMAT_3_5; 2533 2534 return KEY_FORMAT_3_6; 2535 2536 } 2537 2538 static inline void copy_key(struct reiserfs_key *to, 2539 const struct reiserfs_key *from) 2540 { 2541 memcpy(to, from, KEY_SIZE); 2542 } 2543 2544 int comp_items(const struct item_head *stored_ih, const struct treepath *path); 2545 const struct reiserfs_key *get_rkey(const struct treepath *chk_path, 2546 const struct super_block *sb); 2547 int search_by_key(struct super_block *, const struct cpu_key *, 2548 struct treepath *, int); 2549 #define search_item(s,key,path) search_by_key (s, key, path, DISK_LEAF_NODE_LEVEL) 2550 int search_for_position_by_key(struct super_block *sb, 2551 const struct cpu_key *cpu_key, 2552 struct treepath *search_path); 2553 extern void decrement_bcount(struct buffer_head *bh); 2554 void decrement_counters_in_path(struct treepath *search_path); 2555 void pathrelse(struct treepath *search_path); 2556 int reiserfs_check_path(struct treepath *p); 2557 void pathrelse_and_restore(struct super_block *s, struct treepath *search_path); 2558 2559 int reiserfs_insert_item(struct reiserfs_transaction_handle *th, 2560 struct treepath *path, 2561 const struct cpu_key *key, 2562 struct item_head *ih, 2563 struct inode *inode, const char *body); 2564 2565 int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th, 2566 struct treepath *path, 2567 const struct cpu_key *key, 2568 struct inode *inode, 2569 const char *body, int paste_size); 2570 2571 int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th, 2572 struct treepath *path, 2573 struct cpu_key *key, 2574 struct inode *inode, 2575 struct page *page, loff_t new_file_size); 2576 2577 int reiserfs_delete_item(struct reiserfs_transaction_handle *th, 2578 struct treepath *path, 2579 const struct cpu_key *key, 2580 struct inode *inode, struct buffer_head *un_bh); 2581 2582 void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th, 2583 struct inode *inode, struct reiserfs_key *key); 2584 int reiserfs_delete_object(struct reiserfs_transaction_handle *th, 2585 struct inode *inode); 2586 int reiserfs_do_truncate(struct reiserfs_transaction_handle *th, 2587 struct inode *inode, struct page *, 2588 int update_timestamps); 2589 2590 #define i_block_size(inode) ((inode)->i_sb->s_blocksize) 2591 #define file_size(inode) ((inode)->i_size) 2592 #define tail_size(inode) (file_size (inode) & (i_block_size (inode) - 1)) 2593 2594 #define tail_has_to_be_packed(inode) (have_large_tails ((inode)->i_sb)?\ 2595 !STORE_TAIL_IN_UNFM_S1(file_size (inode), tail_size(inode), inode->i_sb->s_blocksize):have_small_tails ((inode)->i_sb)?!STORE_TAIL_IN_UNFM_S2(file_size (inode), tail_size(inode), inode->i_sb->s_blocksize):0 ) 2596 2597 void padd_item(char *item, int total_length, int length); 2598 2599 /* inode.c */ 2600 /* args for the create parameter of reiserfs_get_block */ 2601 #define GET_BLOCK_NO_CREATE 0 /* don't create new blocks or convert tails */ 2602 #define GET_BLOCK_CREATE 1 /* add anything you need to find block */ 2603 #define GET_BLOCK_NO_HOLE 2 /* return -ENOENT for file holes */ 2604 #define GET_BLOCK_READ_DIRECT 4 /* read the tail if indirect item not found */ 2605 #define GET_BLOCK_NO_IMUX 8 /* i_mutex is not held, don't preallocate */ 2606 #define GET_BLOCK_NO_DANGLE 16 /* don't leave any transactions running */ 2607 2608 void reiserfs_read_locked_inode(struct inode *inode, 2609 struct reiserfs_iget_args *args); 2610 int reiserfs_find_actor(struct inode *inode, void *p); 2611 int reiserfs_init_locked_inode(struct inode *inode, void *p); 2612 void reiserfs_evict_inode(struct inode *inode); 2613 int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc); 2614 int reiserfs_get_block(struct inode *inode, sector_t block, 2615 struct buffer_head *bh_result, int create); 2616 struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid, 2617 int fh_len, int fh_type); 2618 struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid, 2619 int fh_len, int fh_type); 2620 int reiserfs_encode_fh(struct inode *inode, __u32 * data, int *lenp, 2621 struct inode *parent); 2622 2623 int reiserfs_truncate_file(struct inode *, int update_timestamps); 2624 void make_cpu_key(struct cpu_key *cpu_key, struct inode *inode, loff_t offset, 2625 int type, int key_length); 2626 void make_le_item_head(struct item_head *ih, const struct cpu_key *key, 2627 int version, 2628 loff_t offset, int type, int length, int entry_count); 2629 struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key); 2630 2631 struct reiserfs_security_handle; 2632 int reiserfs_new_inode(struct reiserfs_transaction_handle *th, 2633 struct inode *dir, umode_t mode, 2634 const char *symname, loff_t i_size, 2635 struct dentry *dentry, struct inode *inode, 2636 struct reiserfs_security_handle *security); 2637 2638 void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th, 2639 struct inode *inode, loff_t size); 2640 2641 static inline void reiserfs_update_sd(struct reiserfs_transaction_handle *th, 2642 struct inode *inode) 2643 { 2644 reiserfs_update_sd_size(th, inode, inode->i_size); 2645 } 2646 2647 void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode); 2648 void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs); 2649 int reiserfs_setattr(struct dentry *dentry, struct iattr *attr); 2650 2651 int __reiserfs_write_begin(struct page *page, unsigned from, unsigned len); 2652 2653 /* namei.c */ 2654 void set_de_name_and_namelen(struct reiserfs_dir_entry *de); 2655 int search_by_entry_key(struct super_block *sb, const struct cpu_key *key, 2656 struct treepath *path, struct reiserfs_dir_entry *de); 2657 struct dentry *reiserfs_get_parent(struct dentry *); 2658 2659 #ifdef CONFIG_REISERFS_PROC_INFO 2660 int reiserfs_proc_info_init(struct super_block *sb); 2661 int reiserfs_proc_info_done(struct super_block *sb); 2662 int reiserfs_proc_info_global_init(void); 2663 int reiserfs_proc_info_global_done(void); 2664 2665 #define PROC_EXP( e ) e 2666 2667 #define __PINFO( sb ) REISERFS_SB(sb) -> s_proc_info_data 2668 #define PROC_INFO_MAX( sb, field, value ) \ 2669 __PINFO( sb ).field = \ 2670 max( REISERFS_SB( sb ) -> s_proc_info_data.field, value ) 2671 #define PROC_INFO_INC( sb, field ) ( ++ ( __PINFO( sb ).field ) ) 2672 #define PROC_INFO_ADD( sb, field, val ) ( __PINFO( sb ).field += ( val ) ) 2673 #define PROC_INFO_BH_STAT( sb, bh, level ) \ 2674 PROC_INFO_INC( sb, sbk_read_at[ ( level ) ] ); \ 2675 PROC_INFO_ADD( sb, free_at[ ( level ) ], B_FREE_SPACE( bh ) ); \ 2676 PROC_INFO_ADD( sb, items_at[ ( level ) ], B_NR_ITEMS( bh ) ) 2677 #else 2678 static inline int reiserfs_proc_info_init(struct super_block *sb) 2679 { 2680 return 0; 2681 } 2682 2683 static inline int reiserfs_proc_info_done(struct super_block *sb) 2684 { 2685 return 0; 2686 } 2687 2688 static inline int reiserfs_proc_info_global_init(void) 2689 { 2690 return 0; 2691 } 2692 2693 static inline int reiserfs_proc_info_global_done(void) 2694 { 2695 return 0; 2696 } 2697 2698 #define PROC_EXP( e ) 2699 #define VOID_V ( ( void ) 0 ) 2700 #define PROC_INFO_MAX( sb, field, value ) VOID_V 2701 #define PROC_INFO_INC( sb, field ) VOID_V 2702 #define PROC_INFO_ADD( sb, field, val ) VOID_V 2703 #define PROC_INFO_BH_STAT(sb, bh, n_node_level) VOID_V 2704 #endif 2705 2706 /* dir.c */ 2707 extern const struct inode_operations reiserfs_dir_inode_operations; 2708 extern const struct inode_operations reiserfs_symlink_inode_operations; 2709 extern const struct inode_operations reiserfs_special_inode_operations; 2710 extern const struct file_operations reiserfs_dir_operations; 2711 int reiserfs_readdir_dentry(struct dentry *, void *, filldir_t, loff_t *); 2712 2713 /* tail_conversion.c */ 2714 int direct2indirect(struct reiserfs_transaction_handle *, struct inode *, 2715 struct treepath *, struct buffer_head *, loff_t); 2716 int indirect2direct(struct reiserfs_transaction_handle *, struct inode *, 2717 struct page *, struct treepath *, const struct cpu_key *, 2718 loff_t, char *); 2719 void reiserfs_unmap_buffer(struct buffer_head *); 2720 2721 /* file.c */ 2722 extern const struct inode_operations reiserfs_file_inode_operations; 2723 extern const struct file_operations reiserfs_file_operations; 2724 extern const struct address_space_operations reiserfs_address_space_operations; 2725 2726 /* fix_nodes.c */ 2727 2728 int fix_nodes(int n_op_mode, struct tree_balance *tb, 2729 struct item_head *ins_ih, const void *); 2730 void unfix_nodes(struct tree_balance *); 2731 2732 /* prints.c */ 2733 void __reiserfs_panic(struct super_block *s, const char *id, 2734 const char *function, const char *fmt, ...) 2735 __attribute__ ((noreturn)); 2736 #define reiserfs_panic(s, id, fmt, args...) \ 2737 __reiserfs_panic(s, id, __func__, fmt, ##args) 2738 void __reiserfs_error(struct super_block *s, const char *id, 2739 const char *function, const char *fmt, ...); 2740 #define reiserfs_error(s, id, fmt, args...) \ 2741 __reiserfs_error(s, id, __func__, fmt, ##args) 2742 void reiserfs_info(struct super_block *s, const char *fmt, ...); 2743 void reiserfs_debug(struct super_block *s, int level, const char *fmt, ...); 2744 void print_indirect_item(struct buffer_head *bh, int item_num); 2745 void store_print_tb(struct tree_balance *tb); 2746 void print_cur_tb(char *mes); 2747 void print_de(struct reiserfs_dir_entry *de); 2748 void print_bi(struct buffer_info *bi, char *mes); 2749 #define PRINT_LEAF_ITEMS 1 /* print all items */ 2750 #define PRINT_DIRECTORY_ITEMS 2 /* print directory items */ 2751 #define PRINT_DIRECT_ITEMS 4 /* print contents of direct items */ 2752 void print_block(struct buffer_head *bh, ...); 2753 void print_bmap(struct super_block *s, int silent); 2754 void print_bmap_block(int i, char *data, int size, int silent); 2755 /*void print_super_block (struct super_block * s, char * mes);*/ 2756 void print_objectid_map(struct super_block *s); 2757 void print_block_head(struct buffer_head *bh, char *mes); 2758 void check_leaf(struct buffer_head *bh); 2759 void check_internal(struct buffer_head *bh); 2760 void print_statistics(struct super_block *s); 2761 char *reiserfs_hashname(int code); 2762 2763 /* lbalance.c */ 2764 int leaf_move_items(int shift_mode, struct tree_balance *tb, int mov_num, 2765 int mov_bytes, struct buffer_head *Snew); 2766 int leaf_shift_left(struct tree_balance *tb, int shift_num, int shift_bytes); 2767 int leaf_shift_right(struct tree_balance *tb, int shift_num, int shift_bytes); 2768 void leaf_delete_items(struct buffer_info *cur_bi, int last_first, int first, 2769 int del_num, int del_bytes); 2770 void leaf_insert_into_buf(struct buffer_info *bi, int before, 2771 struct item_head *inserted_item_ih, 2772 const char *inserted_item_body, int zeros_number); 2773 void leaf_paste_in_buffer(struct buffer_info *bi, int pasted_item_num, 2774 int pos_in_item, int paste_size, const char *body, 2775 int zeros_number); 2776 void leaf_cut_from_buffer(struct buffer_info *bi, int cut_item_num, 2777 int pos_in_item, int cut_size); 2778 void leaf_paste_entries(struct buffer_info *bi, int item_num, int before, 2779 int new_entry_count, struct reiserfs_de_head *new_dehs, 2780 const char *records, int paste_size); 2781 /* ibalance.c */ 2782 int balance_internal(struct tree_balance *, int, int, struct item_head *, 2783 struct buffer_head **); 2784 2785 /* do_balance.c */ 2786 void do_balance_mark_leaf_dirty(struct tree_balance *tb, 2787 struct buffer_head *bh, int flag); 2788 #define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty 2789 #define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty 2790 2791 void do_balance(struct tree_balance *tb, struct item_head *ih, 2792 const char *body, int flag); 2793 void reiserfs_invalidate_buffer(struct tree_balance *tb, 2794 struct buffer_head *bh); 2795 2796 int get_left_neighbor_position(struct tree_balance *tb, int h); 2797 int get_right_neighbor_position(struct tree_balance *tb, int h); 2798 void replace_key(struct tree_balance *tb, struct buffer_head *, int, 2799 struct buffer_head *, int); 2800 void make_empty_node(struct buffer_info *); 2801 struct buffer_head *get_FEB(struct tree_balance *); 2802 2803 /* bitmap.c */ 2804 2805 /* structure contains hints for block allocator, and it is a container for 2806 * arguments, such as node, search path, transaction_handle, etc. */ 2807 struct __reiserfs_blocknr_hint { 2808 struct inode *inode; /* inode passed to allocator, if we allocate unf. nodes */ 2809 sector_t block; /* file offset, in blocks */ 2810 struct in_core_key key; 2811 struct treepath *path; /* search path, used by allocator to deternine search_start by 2812 * various ways */ 2813 struct reiserfs_transaction_handle *th; /* transaction handle is needed to log super blocks and 2814 * bitmap blocks changes */ 2815 b_blocknr_t beg, end; 2816 b_blocknr_t search_start; /* a field used to transfer search start value (block number) 2817 * between different block allocator procedures 2818 * (determine_search_start() and others) */ 2819 int prealloc_size; /* is set in determine_prealloc_size() function, used by underlayed 2820 * function that do actual allocation */ 2821 2822 unsigned formatted_node:1; /* the allocator uses different polices for getting disk space for 2823 * formatted/unformatted blocks with/without preallocation */ 2824 unsigned preallocate:1; 2825 }; 2826 2827 typedef struct __reiserfs_blocknr_hint reiserfs_blocknr_hint_t; 2828 2829 int reiserfs_parse_alloc_options(struct super_block *, char *); 2830 void reiserfs_init_alloc_options(struct super_block *s); 2831 2832 /* 2833 * given a directory, this will tell you what packing locality 2834 * to use for a new object underneat it. The locality is returned 2835 * in disk byte order (le). 2836 */ 2837 __le32 reiserfs_choose_packing(struct inode *dir); 2838 2839 int reiserfs_init_bitmap_cache(struct super_block *sb); 2840 void reiserfs_free_bitmap_cache(struct super_block *sb); 2841 void reiserfs_cache_bitmap_metadata(struct super_block *sb, struct buffer_head *bh, struct reiserfs_bitmap_info *info); 2842 struct buffer_head *reiserfs_read_bitmap_block(struct super_block *sb, unsigned int bitmap); 2843 int is_reusable(struct super_block *s, b_blocknr_t block, int bit_value); 2844 void reiserfs_free_block(struct reiserfs_transaction_handle *th, struct inode *, 2845 b_blocknr_t, int for_unformatted); 2846 int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t *, b_blocknr_t *, int, 2847 int); 2848 static inline int reiserfs_new_form_blocknrs(struct tree_balance *tb, 2849 b_blocknr_t * new_blocknrs, 2850 int amount_needed) 2851 { 2852 reiserfs_blocknr_hint_t hint = { 2853 .th = tb->transaction_handle, 2854 .path = tb->tb_path, 2855 .inode = NULL, 2856 .key = tb->key, 2857 .block = 0, 2858 .formatted_node = 1 2859 }; 2860 return reiserfs_allocate_blocknrs(&hint, new_blocknrs, amount_needed, 2861 0); 2862 } 2863 2864 static inline int reiserfs_new_unf_blocknrs(struct reiserfs_transaction_handle 2865 *th, struct inode *inode, 2866 b_blocknr_t * new_blocknrs, 2867 struct treepath *path, 2868 sector_t block) 2869 { 2870 reiserfs_blocknr_hint_t hint = { 2871 .th = th, 2872 .path = path, 2873 .inode = inode, 2874 .block = block, 2875 .formatted_node = 0, 2876 .preallocate = 0 2877 }; 2878 return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0); 2879 } 2880 2881 #ifdef REISERFS_PREALLOCATE 2882 static inline int reiserfs_new_unf_blocknrs2(struct reiserfs_transaction_handle 2883 *th, struct inode *inode, 2884 b_blocknr_t * new_blocknrs, 2885 struct treepath *path, 2886 sector_t block) 2887 { 2888 reiserfs_blocknr_hint_t hint = { 2889 .th = th, 2890 .path = path, 2891 .inode = inode, 2892 .block = block, 2893 .formatted_node = 0, 2894 .preallocate = 1 2895 }; 2896 return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0); 2897 } 2898 2899 void reiserfs_discard_prealloc(struct reiserfs_transaction_handle *th, 2900 struct inode *inode); 2901 void reiserfs_discard_all_prealloc(struct reiserfs_transaction_handle *th); 2902 #endif 2903 2904 /* hashes.c */ 2905 __u32 keyed_hash(const signed char *msg, int len); 2906 __u32 yura_hash(const signed char *msg, int len); 2907 __u32 r5_hash(const signed char *msg, int len); 2908 2909 #define reiserfs_set_le_bit __set_bit_le 2910 #define reiserfs_test_and_set_le_bit __test_and_set_bit_le 2911 #define reiserfs_clear_le_bit __clear_bit_le 2912 #define reiserfs_test_and_clear_le_bit __test_and_clear_bit_le 2913 #define reiserfs_test_le_bit test_bit_le 2914 #define reiserfs_find_next_zero_le_bit find_next_zero_bit_le 2915 2916 /* sometimes reiserfs_truncate may require to allocate few new blocks 2917 to perform indirect2direct conversion. People probably used to 2918 think, that truncate should work without problems on a filesystem 2919 without free disk space. They may complain that they can not 2920 truncate due to lack of free disk space. This spare space allows us 2921 to not worry about it. 500 is probably too much, but it should be 2922 absolutely safe */ 2923 #define SPARE_SPACE 500 2924 2925 /* prototypes from ioctl.c */ 2926 long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg); 2927 long reiserfs_compat_ioctl(struct file *filp, 2928 unsigned int cmd, unsigned long arg); 2929 int reiserfs_unpack(struct inode *inode, struct file *filp); 2930