2 * Copyright 1996, 1997, 1998 Hans Reiser, see reiserfs/README for licensing and copyright details
5 /* this file has an amazingly stupid
6 name, yura please fix it to be
7 reiserfs.h, and merge all the rest
8 of our .h files that are in this
12 #ifndef _LINUX_REISER_FS_H
13 #define _LINUX_REISER_FS_H
15 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/interrupt.h>
19 #include <linux/sched.h>
20 #include <linux/workqueue.h>
21 #include <asm/unaligned.h>
22 #include <linux/bitops.h>
23 #include <linux/proc_fs.h>
24 #include <linux/smp_lock.h>
25 #include <linux/buffer_head.h>
26 #include <linux/reiserfs_fs_i.h>
27 #include <linux/reiserfs_fs_sb.h>
31 * include/linux/reiser_fs.h
33 * Reiser File System constants and structures
37 /* in reading the #defines, it may help to understand that they employ
38 the following abbreviations:
42 H = Height within the tree (should be changed to LEV)
43 N = Number of the item in the node
45 DEH = Directory Entry Header
50 UNFM = UNForMatted node
54 These #defines are named by concatenating these abbreviations,
55 where first comes the arguments, and last comes the return value,
60 #define USE_INODE_GENERATION_COUNTER
62 #define REISERFS_PREALLOCATE
63 #define DISPLACE_NEW_PACKING_LOCALITIES
64 #define PREALLOCATION_SIZE 9
66 /* n must be power of 2 */
67 #define _ROUND_UP(x,n) (((x)+(n)-1u) & ~((n)-1u))
69 // to be ok for alpha and others we have to align structures to 8 byte
71 // FIXME: do not change 4 by anything else: there is code which relies on that
72 #define ROUND_UP(x) _ROUND_UP(x,8LL)
74 /* debug levels. Right now, CONFIG_REISERFS_CHECK means print all debug
77 #define REISERFS_DEBUG_CODE 5 /* extra messages to help find/debug errors */
79 void reiserfs_warning (struct super_block *s, const char * fmt, ...);
80 /* assertions handling */
82 /** always check a condition and panic if it's false. */
83 #define RASSERT( cond, format, args... ) \
85 reiserfs_panic( NULL, "reiserfs[%i]: assertion " #cond " failed at " \
86 __FILE__ ":%i:%s: " format "\n", \
87 in_interrupt() ? -1 : current -> pid, __LINE__ , __FUNCTION__ , ##args )
89 #if defined( CONFIG_REISERFS_CHECK )
90 #define RFALSE( cond, format, args... ) RASSERT( !( cond ), format, ##args )
92 #define RFALSE( cond, format, args... ) do {;} while( 0 )
95 #define CONSTF __attribute_const__
97 * Disk Data Structures
100 /***************************************************************************/
102 /***************************************************************************/
105 * Structure of super block on disk, a version of which in RAM is often accessed as REISERFS_SB(s)->s_rs
106 * the version in RAM is part of a larger structure containing fields never written to disk.
108 #define UNSET_HASH 0 // read_super will guess about, what hash names
109 // in directories were sorted with
113 #define DEFAULT_HASH R5_HASH
116 struct journal_params {
117 __u32 jp_journal_1st_block; /* where does journal start from on its
119 __u32 jp_journal_dev; /* journal device st_rdev */
120 __u32 jp_journal_size; /* size of the journal */
121 __u32 jp_journal_trans_max; /* max number of blocks in a transaction. */
122 __u32 jp_journal_magic; /* random value made on fs creation (this
123 * was sb_journal_block_count) */
124 __u32 jp_journal_max_batch; /* max number of blocks to batch into a
126 __u32 jp_journal_max_commit_age; /* in seconds, how old can an async
128 __u32 jp_journal_max_trans_age; /* in seconds, how old can a transaction
132 /* this is the super from 3.5.X, where X >= 10 */
133 struct reiserfs_super_block_v1
135 __u32 s_block_count; /* blocks count */
136 __u32 s_free_blocks; /* free blocks count */
137 __u32 s_root_block; /* root block number */
138 struct journal_params s_journal;
139 __u16 s_blocksize; /* block size */
140 __u16 s_oid_maxsize; /* max size of object id array, see
141 * get_objectid() commentary */
142 __u16 s_oid_cursize; /* current size of object id array */
143 __u16 s_umount_state; /* this is set to 1 when filesystem was
144 * umounted, to 2 - when not */
145 char s_magic[10]; /* reiserfs magic string indicates that
146 * file system is reiserfs:
147 * "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" */
148 __u16 s_fs_state; /* it is set to used by fsck to mark which
149 * phase of rebuilding is done */
150 __u32 s_hash_function_code; /* indicate, what hash function is being use
151 * to sort names in a directory*/
152 __u16 s_tree_height; /* height of disk tree */
153 __u16 s_bmap_nr; /* amount of bitmap blocks needed to address
154 * each block of file system */
155 __u16 s_version; /* this field is only reliable on filesystem
156 * with non-standard journal */
157 __u16 s_reserved_for_journal; /* size in blocks of journal area on main
158 * device, we need to keep after
159 * making fs with non-standard journal */
160 } __attribute__ ((__packed__));
162 #define SB_SIZE_V1 (sizeof(struct reiserfs_super_block_v1))
164 /* this is the on disk super block */
165 struct reiserfs_super_block
167 struct reiserfs_super_block_v1 s_v1;
168 __u32 s_inode_generation;
169 __u32 s_flags; /* Right now used only by inode-attributes, if enabled */
170 unsigned char s_uuid[16]; /* filesystem unique identifier */
171 unsigned char s_label[16]; /* filesystem volume label */
172 char s_unused[88] ; /* zero filled by mkreiserfs and
173 * reiserfs_convert_objectid_map_v1()
174 * so any additions must be updated
176 } __attribute__ ((__packed__));
178 #define SB_SIZE (sizeof(struct reiserfs_super_block))
180 #define REISERFS_VERSION_1 0
181 #define REISERFS_VERSION_2 2
184 // on-disk super block fields converted to cpu form
185 #define SB_DISK_SUPER_BLOCK(s) (REISERFS_SB(s)->s_rs)
186 #define SB_V1_DISK_SUPER_BLOCK(s) (&(SB_DISK_SUPER_BLOCK(s)->s_v1))
187 #define SB_BLOCKSIZE(s) \
188 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_blocksize))
189 #define SB_BLOCK_COUNT(s) \
190 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_block_count))
191 #define SB_FREE_BLOCKS(s) \
192 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_free_blocks))
193 #define SB_REISERFS_MAGIC(s) \
194 (SB_V1_DISK_SUPER_BLOCK(s)->s_magic)
195 #define SB_ROOT_BLOCK(s) \
196 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_root_block))
197 #define SB_TREE_HEIGHT(s) \
198 le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_tree_height))
199 #define SB_REISERFS_STATE(s) \
200 le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_umount_state))
201 #define SB_VERSION(s) le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_version))
202 #define SB_BMAP_NR(s) le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_bmap_nr))
204 #define PUT_SB_BLOCK_COUNT(s, val) \
205 do { SB_V1_DISK_SUPER_BLOCK(s)->s_block_count = cpu_to_le32(val); } while (0)
206 #define PUT_SB_FREE_BLOCKS(s, val) \
207 do { SB_V1_DISK_SUPER_BLOCK(s)->s_free_blocks = cpu_to_le32(val); } while (0)
208 #define PUT_SB_ROOT_BLOCK(s, val) \
209 do { SB_V1_DISK_SUPER_BLOCK(s)->s_root_block = cpu_to_le32(val); } while (0)
210 #define PUT_SB_TREE_HEIGHT(s, val) \
211 do { SB_V1_DISK_SUPER_BLOCK(s)->s_tree_height = cpu_to_le16(val); } while (0)
212 #define PUT_SB_REISERFS_STATE(s, val) \
213 do { SB_V1_DISK_SUPER_BLOCK(s)->s_umount_state = cpu_to_le16(val); } while (0)
214 #define PUT_SB_VERSION(s, val) \
215 do { SB_V1_DISK_SUPER_BLOCK(s)->s_version = cpu_to_le16(val); } while (0)
216 #define PUT_SB_BMAP_NR(s, val) \
217 do { SB_V1_DISK_SUPER_BLOCK(s)->s_bmap_nr = cpu_to_le16 (val); } while (0)
220 #define SB_ONDISK_JP(s) (&SB_V1_DISK_SUPER_BLOCK(s)->s_journal)
221 #define SB_ONDISK_JOURNAL_SIZE(s) \
222 le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_size))
223 #define SB_ONDISK_JOURNAL_1st_BLOCK(s) \
224 le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_1st_block))
225 #define SB_ONDISK_JOURNAL_DEVICE(s) \
226 le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_dev))
227 #define SB_ONDISK_RESERVED_FOR_JOURNAL(s) \
228 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_reserved_for_journal))
230 #define is_block_in_log_or_reserved_area(s, block) \
231 block >= SB_JOURNAL_1st_RESERVED_BLOCK(s) \
232 && block < SB_JOURNAL_1st_RESERVED_BLOCK(s) + \
233 ((!is_reiserfs_jr(SB_DISK_SUPER_BLOCK(s)) ? \
234 SB_ONDISK_JOURNAL_SIZE(s) + 1 : SB_ONDISK_RESERVED_FOR_JOURNAL(s)))
239 #define REISERFS_SUPER_MAGIC 0x52654973
240 /* used by file system utilities that
241 look at the superblock, etc. */
242 #define REISERFS_SUPER_MAGIC_STRING "ReIsErFs"
243 #define REISER2FS_SUPER_MAGIC_STRING "ReIsEr2Fs"
244 #define REISER2FS_JR_SUPER_MAGIC_STRING "ReIsEr3Fs"
246 int is_reiserfs_3_5 (struct reiserfs_super_block * rs);
247 int is_reiserfs_3_6 (struct reiserfs_super_block * rs);
248 int is_reiserfs_jr (struct reiserfs_super_block * rs);
250 /* ReiserFS leaves the first 64k unused, so that partition labels have
251 enough space. If someone wants to write a fancy bootloader that
252 needs more than 64k, let us know, and this will be increased in size.
253 This number must be larger than than the largest block size on any
254 platform, or code will break. -Hans */
255 #define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024)
256 #define REISERFS_FIRST_BLOCK unused_define
257 #define REISERFS_JOURNAL_OFFSET_IN_BYTES REISERFS_DISK_OFFSET_IN_BYTES
259 /* the spot for the super in versions 3.5 - 3.5.10 (inclusive) */
260 #define REISERFS_OLD_DISK_OFFSET_IN_BYTES (8 * 1024)
262 // reiserfs internal error code (used by search_by_key adn fix_nodes))
264 #define REPEAT_SEARCH -1
266 #define NO_DISK_SPACE -3
267 #define NO_BALANCING_NEEDED (-4)
268 #define NO_MORE_UNUSED_CONTIGUOUS_BLOCKS (-5)
269 #define QUOTA_EXCEEDED -6
271 typedef __u32 b_blocknr_t;
274 struct unfm_nodeinfo {
276 unsigned short unfm_freespace;
279 /* there are two formats of keys: 3.5 and 3.6
281 #define KEY_FORMAT_3_5 0
282 #define KEY_FORMAT_3_6 1
284 /* there are two stat datas */
285 #define STAT_DATA_V1 0
286 #define STAT_DATA_V2 1
289 static inline struct reiserfs_inode_info *REISERFS_I(const struct inode *inode)
291 return container_of(inode, struct reiserfs_inode_info, vfs_inode);
294 static inline struct reiserfs_sb_info *REISERFS_SB(const struct super_block *sb)
296 return sb->s_fs_info;
299 /** this says about version of key of all items (but stat data) the
300 object consists of */
301 #define get_inode_item_key_version( inode ) \
302 ((REISERFS_I(inode)->i_flags & i_item_key_version_mask) ? KEY_FORMAT_3_6 : KEY_FORMAT_3_5)
304 #define set_inode_item_key_version( inode, version ) \
305 ({ if((version)==KEY_FORMAT_3_6) \
306 REISERFS_I(inode)->i_flags |= i_item_key_version_mask; \
308 REISERFS_I(inode)->i_flags &= ~i_item_key_version_mask; })
310 #define get_inode_sd_version(inode) \
311 ((REISERFS_I(inode)->i_flags & i_stat_data_version_mask) ? STAT_DATA_V2 : STAT_DATA_V1)
313 #define set_inode_sd_version(inode, version) \
314 ({ if((version)==STAT_DATA_V2) \
315 REISERFS_I(inode)->i_flags |= i_stat_data_version_mask; \
317 REISERFS_I(inode)->i_flags &= ~i_stat_data_version_mask; })
319 /* This is an aggressive tail suppression policy, I am hoping it
320 improves our benchmarks. The principle behind it is that percentage
321 space saving is what matters, not absolute space saving. This is
322 non-intuitive, but it helps to understand it if you consider that the
323 cost to access 4 blocks is not much more than the cost to access 1
324 block, if you have to do a seek and rotate. A tail risks a
325 non-linear disk access that is significant as a percentage of total
326 time cost for a 4 block file and saves an amount of space that is
327 less significant as a percentage of space, or so goes the hypothesis.
329 #define STORE_TAIL_IN_UNFM_S1(n_file_size,n_tail_size,n_block_size) \
331 (!(n_tail_size)) || \
332 (((n_tail_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) || \
333 ( (n_file_size) >= (n_block_size) * 4 ) || \
334 ( ( (n_file_size) >= (n_block_size) * 3 ) && \
335 ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size))/4) ) || \
336 ( ( (n_file_size) >= (n_block_size) * 2 ) && \
337 ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size))/2) ) || \
338 ( ( (n_file_size) >= (n_block_size) ) && \
339 ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size) * 3)/4) ) ) \
342 /* Another strategy for tails, this one means only create a tail if all the
343 file would fit into one DIRECT item.
344 Primary intention for this one is to increase performance by decreasing
347 #define STORE_TAIL_IN_UNFM_S2(n_file_size,n_tail_size,n_block_size) \
349 (!(n_tail_size)) || \
350 (((n_file_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) ) \
356 * values for s_umount_state field
358 #define REISERFS_VALID_FS 1
359 #define REISERFS_ERROR_FS 2
362 // there are 5 item types currently
364 #define TYPE_STAT_DATA 0
365 #define TYPE_INDIRECT 1
366 #define TYPE_DIRECT 2
367 #define TYPE_DIRENTRY 3
368 #define TYPE_MAXTYPE 3
369 #define TYPE_ANY 15 // FIXME: comment is required
371 /***************************************************************************/
372 /* KEY & ITEM HEAD */
373 /***************************************************************************/
376 // directories use this key as well as old files
381 } __attribute__ ((__packed__));
384 #ifdef __LITTLE_ENDIAN
385 /* little endian version */
389 /* big endian version */
393 } __attribute__ ((__packed__));
395 #ifndef __LITTLE_ENDIAN
397 struct offset_v2 offset_v2;
399 } __attribute__ ((__packed__)) offset_v2_esafe_overlay;
401 static inline __u16 offset_v2_k_type( const struct offset_v2 *v2 )
403 offset_v2_esafe_overlay tmp = *(const offset_v2_esafe_overlay *)v2;
404 tmp.linear = le64_to_cpu( tmp.linear );
405 return (tmp.offset_v2.k_type <= TYPE_MAXTYPE)?tmp.offset_v2.k_type:TYPE_ANY;
408 static inline void set_offset_v2_k_type( struct offset_v2 *v2, int type )
410 offset_v2_esafe_overlay *tmp = (offset_v2_esafe_overlay *)v2;
411 tmp->linear = le64_to_cpu(tmp->linear);
412 tmp->offset_v2.k_type = type;
413 tmp->linear = cpu_to_le64(tmp->linear);
416 static inline loff_t offset_v2_k_offset( const struct offset_v2 *v2 )
418 offset_v2_esafe_overlay tmp = *(const offset_v2_esafe_overlay *)v2;
419 tmp.linear = le64_to_cpu( tmp.linear );
420 return tmp.offset_v2.k_offset;
423 static inline void set_offset_v2_k_offset( struct offset_v2 *v2, loff_t offset ){
424 offset_v2_esafe_overlay *tmp = (offset_v2_esafe_overlay *)v2;
425 tmp->linear = le64_to_cpu(tmp->linear);
426 tmp->offset_v2.k_offset = offset;
427 tmp->linear = cpu_to_le64(tmp->linear);
430 # define offset_v2_k_type(v2) ((v2)->k_type)
431 # define set_offset_v2_k_type(v2,val) (offset_v2_k_type(v2) = (val))
432 # define offset_v2_k_offset(v2) ((v2)->k_offset)
433 # define set_offset_v2_k_offset(v2,val) (offset_v2_k_offset(v2) = (val))
436 /* Key of an item determines its location in the S+tree, and
437 is composed of 4 components */
438 struct reiserfs_key {
439 __u32 k_dir_id; /* packing locality: by default parent
440 directory object id */
441 __u32 k_objectid; /* object identifier */
443 struct offset_v1 k_offset_v1;
444 struct offset_v2 k_offset_v2;
445 } __attribute__ ((__packed__)) u;
446 } __attribute__ ((__packed__));
450 struct reiserfs_key on_disk_key;
452 int key_length; /* 3 in all cases but direct2indirect and
453 indirect2direct conversion */
456 /* Our function for comparing keys can compare keys of different
457 lengths. It takes as a parameter the length of the keys it is to
458 compare. These defines are used in determining what is to be passed
459 to it as that parameter. */
460 #define REISERFS_FULL_KEY_LEN 4
461 #define REISERFS_SHORT_KEY_LEN 2
463 /* The result of the key compare */
464 #define FIRST_GREATER 1
465 #define SECOND_GREATER -1
466 #define KEYS_IDENTICAL 0
468 #define KEY_NOT_FOUND 0
470 #define KEY_SIZE (sizeof(struct reiserfs_key))
471 #define SHORT_KEY_SIZE (sizeof (__u32) + sizeof (__u32))
473 /* return values for search_by_key and clones */
475 #define ITEM_NOT_FOUND 0
476 #define ENTRY_FOUND 1
477 #define ENTRY_NOT_FOUND 0
478 #define DIRECTORY_NOT_FOUND -1
479 #define REGULAR_FILE_FOUND -2
480 #define DIRECTORY_FOUND -3
482 #define BYTE_NOT_FOUND 0
483 #define FILE_NOT_FOUND -1
485 #define POSITION_FOUND 1
486 #define POSITION_NOT_FOUND 0
488 // return values for reiserfs_find_entry and search_by_entry_key
490 #define NAME_NOT_FOUND 0
491 #define GOTO_PREVIOUS_ITEM 2
492 #define NAME_FOUND_INVISIBLE 3
494 /* Everything in the filesystem is stored as a set of items. The
495 item head contains the key of the item, its free space (for
496 indirect items) and specifies the location of the item itself
501 /* Everything in the tree is found by searching for it based on
503 struct reiserfs_key ih_key;
505 /* The free space in the last unformatted node of an
506 indirect item if this is an indirect item. This
507 equals 0xFFFF iff this is a direct item or stat data
508 item. Note that the key, not this field, is used to
509 determine the item type, and thus which field this
511 __u16 ih_free_space_reserved;
512 /* Iff this is a directory item, this field equals the
513 number of directory entries in the directory item. */
514 __u16 ih_entry_count;
515 } __attribute__ ((__packed__)) u;
516 __u16 ih_item_len; /* total size of the item body */
517 __u16 ih_item_location; /* an offset to the item body
518 * within the block */
519 __u16 ih_version; /* 0 for all old items, 2 for new
520 ones. Highest bit is set by fsck
521 temporary, cleaned after all
523 } __attribute__ ((__packed__));
524 /* size of item header */
525 #define IH_SIZE (sizeof(struct item_head))
527 #define ih_free_space(ih) le16_to_cpu((ih)->u.ih_free_space_reserved)
528 #define ih_version(ih) le16_to_cpu((ih)->ih_version)
529 #define ih_entry_count(ih) le16_to_cpu((ih)->u.ih_entry_count)
530 #define ih_location(ih) le16_to_cpu((ih)->ih_item_location)
531 #define ih_item_len(ih) le16_to_cpu((ih)->ih_item_len)
533 #define put_ih_free_space(ih, val) do { (ih)->u.ih_free_space_reserved = cpu_to_le16(val); } while(0)
534 #define put_ih_version(ih, val) do { (ih)->ih_version = cpu_to_le16(val); } while (0)
535 #define put_ih_entry_count(ih, val) do { (ih)->u.ih_entry_count = cpu_to_le16(val); } while (0)
536 #define put_ih_location(ih, val) do { (ih)->ih_item_location = cpu_to_le16(val); } while (0)
537 #define put_ih_item_len(ih, val) do { (ih)->ih_item_len = cpu_to_le16(val); } while (0)
540 #define unreachable_item(ih) (ih_version(ih) & (1 << 15))
542 #define get_ih_free_space(ih) (ih_version (ih) == KEY_FORMAT_3_6 ? 0 : ih_free_space (ih))
543 #define set_ih_free_space(ih,val) put_ih_free_space((ih), ((ih_version(ih) == KEY_FORMAT_3_6) ? 0 : (val)))
545 /* these operate on indirect items, where you've got an array of ints
546 ** at a possibly unaligned location. These are a noop on ia32
548 ** p is the array of __u32, i is the index into the array, v is the value
551 #define get_block_num(p, i) le32_to_cpu(get_unaligned((p) + (i)))
552 #define put_block_num(p, i, v) put_unaligned(cpu_to_le32(v), (p) + (i))
555 // in old version uniqueness field shows key type
557 #define V1_SD_UNIQUENESS 0
558 #define V1_INDIRECT_UNIQUENESS 0xfffffffe
559 #define V1_DIRECT_UNIQUENESS 0xffffffff
560 #define V1_DIRENTRY_UNIQUENESS 500
561 #define V1_ANY_UNIQUENESS 555 // FIXME: comment is required
564 // here are conversion routines
566 static inline int uniqueness2type (__u32 uniqueness) CONSTF;
567 static inline int uniqueness2type (__u32 uniqueness)
569 switch ((int)uniqueness) {
570 case V1_SD_UNIQUENESS: return TYPE_STAT_DATA;
571 case V1_INDIRECT_UNIQUENESS: return TYPE_INDIRECT;
572 case V1_DIRECT_UNIQUENESS: return TYPE_DIRECT;
573 case V1_DIRENTRY_UNIQUENESS: return TYPE_DIRENTRY;
575 reiserfs_warning (NULL, "vs-500: unknown uniqueness %d",
577 case V1_ANY_UNIQUENESS:
582 static inline __u32 type2uniqueness (int type) CONSTF;
583 static inline __u32 type2uniqueness (int type)
586 case TYPE_STAT_DATA: return V1_SD_UNIQUENESS;
587 case TYPE_INDIRECT: return V1_INDIRECT_UNIQUENESS;
588 case TYPE_DIRECT: return V1_DIRECT_UNIQUENESS;
589 case TYPE_DIRENTRY: return V1_DIRENTRY_UNIQUENESS;
591 reiserfs_warning (NULL, "vs-501: unknown type %d", type);
593 return V1_ANY_UNIQUENESS;
598 // key is pointer to on disk key which is stored in le, result is cpu,
599 // there is no way to get version of object from key, so, provide
600 // version to these defines
602 static inline loff_t le_key_k_offset (int version, const struct reiserfs_key * key)
604 return (version == KEY_FORMAT_3_5) ?
605 le32_to_cpu( key->u.k_offset_v1.k_offset ) :
606 offset_v2_k_offset( &(key->u.k_offset_v2) );
609 static inline loff_t le_ih_k_offset (const struct item_head * ih)
611 return le_key_k_offset (ih_version (ih), &(ih->ih_key));
614 static inline loff_t le_key_k_type (int version, const struct reiserfs_key * key)
616 return (version == KEY_FORMAT_3_5) ?
617 uniqueness2type( le32_to_cpu( key->u.k_offset_v1.k_uniqueness)) :
618 offset_v2_k_type( &(key->u.k_offset_v2) );
621 static inline loff_t le_ih_k_type (const struct item_head * ih)
623 return le_key_k_type (ih_version (ih), &(ih->ih_key));
627 static inline void set_le_key_k_offset (int version, struct reiserfs_key * key, loff_t offset)
629 (version == KEY_FORMAT_3_5) ?
630 (void)(key->u.k_offset_v1.k_offset = cpu_to_le32 (offset)) : /* jdm check */
631 (void)(set_offset_v2_k_offset( &(key->u.k_offset_v2), offset ));
635 static inline void set_le_ih_k_offset (struct item_head * ih, loff_t offset)
637 set_le_key_k_offset (ih_version (ih), &(ih->ih_key), offset);
641 static inline void set_le_key_k_type (int version, struct reiserfs_key * key, int type)
643 (version == KEY_FORMAT_3_5) ?
644 (void)(key->u.k_offset_v1.k_uniqueness = cpu_to_le32(type2uniqueness(type))):
645 (void)(set_offset_v2_k_type( &(key->u.k_offset_v2), type ));
647 static inline void set_le_ih_k_type (struct item_head * ih, int type)
649 set_le_key_k_type (ih_version (ih), &(ih->ih_key), type);
653 #define is_direntry_le_key(version,key) (le_key_k_type (version, key) == TYPE_DIRENTRY)
654 #define is_direct_le_key(version,key) (le_key_k_type (version, key) == TYPE_DIRECT)
655 #define is_indirect_le_key(version,key) (le_key_k_type (version, key) == TYPE_INDIRECT)
656 #define is_statdata_le_key(version,key) (le_key_k_type (version, key) == TYPE_STAT_DATA)
659 // item header has version.
661 #define is_direntry_le_ih(ih) is_direntry_le_key (ih_version (ih), &((ih)->ih_key))
662 #define is_direct_le_ih(ih) is_direct_le_key (ih_version (ih), &((ih)->ih_key))
663 #define is_indirect_le_ih(ih) is_indirect_le_key (ih_version(ih), &((ih)->ih_key))
664 #define is_statdata_le_ih(ih) is_statdata_le_key (ih_version (ih), &((ih)->ih_key))
669 // key is pointer to cpu key, result is cpu
671 static inline loff_t cpu_key_k_offset (const struct cpu_key * key)
673 return (key->version == KEY_FORMAT_3_5) ?
674 key->on_disk_key.u.k_offset_v1.k_offset :
675 key->on_disk_key.u.k_offset_v2.k_offset;
678 static inline loff_t cpu_key_k_type (const struct cpu_key * key)
680 return (key->version == KEY_FORMAT_3_5) ?
681 uniqueness2type (key->on_disk_key.u.k_offset_v1.k_uniqueness) :
682 key->on_disk_key.u.k_offset_v2.k_type;
685 static inline void set_cpu_key_k_offset (struct cpu_key * key, loff_t offset)
687 (key->version == KEY_FORMAT_3_5) ?
688 (key->on_disk_key.u.k_offset_v1.k_offset = offset) :
689 (key->on_disk_key.u.k_offset_v2.k_offset = offset);
693 static inline void set_cpu_key_k_type (struct cpu_key * key, int type)
695 (key->version == KEY_FORMAT_3_5) ?
696 (key->on_disk_key.u.k_offset_v1.k_uniqueness = type2uniqueness (type)):
697 (key->on_disk_key.u.k_offset_v2.k_type = type);
701 static inline void cpu_key_k_offset_dec (struct cpu_key * key)
703 if (key->version == KEY_FORMAT_3_5)
704 key->on_disk_key.u.k_offset_v1.k_offset --;
706 key->on_disk_key.u.k_offset_v2.k_offset --;
710 #define is_direntry_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRENTRY)
711 #define is_direct_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRECT)
712 #define is_indirect_cpu_key(key) (cpu_key_k_type (key) == TYPE_INDIRECT)
713 #define is_statdata_cpu_key(key) (cpu_key_k_type (key) == TYPE_STAT_DATA)
716 /* are these used ? */
717 #define is_direntry_cpu_ih(ih) (is_direntry_cpu_key (&((ih)->ih_key)))
718 #define is_direct_cpu_ih(ih) (is_direct_cpu_key (&((ih)->ih_key)))
719 #define is_indirect_cpu_ih(ih) (is_indirect_cpu_key (&((ih)->ih_key)))
720 #define is_statdata_cpu_ih(ih) (is_statdata_cpu_key (&((ih)->ih_key)))
726 #define I_K_KEY_IN_ITEM(p_s_ih, p_s_key, n_blocksize) \
727 ( ! COMP_SHORT_KEYS(p_s_ih, p_s_key) && \
728 I_OFF_BYTE_IN_ITEM(p_s_ih, k_offset (p_s_key), n_blocksize) )
730 /* maximal length of item */
731 #define MAX_ITEM_LEN(block_size) (block_size - BLKH_SIZE - IH_SIZE)
732 #define MIN_ITEM_LEN 1
735 /* object identifier for root dir */
736 #define REISERFS_ROOT_OBJECTID 2
737 #define REISERFS_ROOT_PARENT_OBJECTID 1
738 extern struct reiserfs_key root_key;
744 * Picture represents a leaf of the S+tree
745 * ______________________________________________________
747 * |Block | Object-Item | F r e e | Objects- |
748 * | head | Headers | S p a c e | Items |
749 * |______|_______________|___________________|___________|
752 /* Header of a disk block. More precisely, header of a formatted leaf
753 or internal node, and not the header of an unformatted node. */
755 __u16 blk_level; /* Level of a block in the tree. */
756 __u16 blk_nr_item; /* Number of keys/items in a block. */
757 __u16 blk_free_space; /* Block free space in bytes. */
759 /* dump this in v4/planA */
760 struct reiserfs_key blk_right_delim_key; /* kept only for compatibility */
763 #define BLKH_SIZE (sizeof(struct block_head))
764 #define blkh_level(p_blkh) (le16_to_cpu((p_blkh)->blk_level))
765 #define blkh_nr_item(p_blkh) (le16_to_cpu((p_blkh)->blk_nr_item))
766 #define blkh_free_space(p_blkh) (le16_to_cpu((p_blkh)->blk_free_space))
767 #define blkh_reserved(p_blkh) (le16_to_cpu((p_blkh)->blk_reserved))
768 #define set_blkh_level(p_blkh,val) ((p_blkh)->blk_level = cpu_to_le16(val))
769 #define set_blkh_nr_item(p_blkh,val) ((p_blkh)->blk_nr_item = cpu_to_le16(val))
770 #define set_blkh_free_space(p_blkh,val) ((p_blkh)->blk_free_space = cpu_to_le16(val))
771 #define set_blkh_reserved(p_blkh,val) ((p_blkh)->blk_reserved = cpu_to_le16(val))
772 #define blkh_right_delim_key(p_blkh) ((p_blkh)->blk_right_delim_key)
773 #define set_blkh_right_delim_key(p_blkh,val) ((p_blkh)->blk_right_delim_key = val)
776 * values for blk_level field of the struct block_head
779 #define FREE_LEVEL 0 /* when node gets removed from the tree its
780 blk_level is set to FREE_LEVEL. It is then
781 used to see whether the node is still in the
784 #define DISK_LEAF_NODE_LEVEL 1 /* Leaf node level.*/
786 /* Given the buffer head of a formatted node, resolve to the block head of that node. */
787 #define B_BLK_HEAD(p_s_bh) ((struct block_head *)((p_s_bh)->b_data))
788 /* Number of items that are in buffer. */
789 #define B_NR_ITEMS(p_s_bh) (blkh_nr_item(B_BLK_HEAD(p_s_bh)))
790 #define B_LEVEL(p_s_bh) (blkh_level(B_BLK_HEAD(p_s_bh)))
791 #define B_FREE_SPACE(p_s_bh) (blkh_free_space(B_BLK_HEAD(p_s_bh)))
793 #define PUT_B_NR_ITEMS(p_s_bh,val) do { set_blkh_nr_item(B_BLK_HEAD(p_s_bh),val); } while (0)
794 #define PUT_B_LEVEL(p_s_bh,val) do { set_blkh_level(B_BLK_HEAD(p_s_bh),val); } while (0)
795 #define PUT_B_FREE_SPACE(p_s_bh,val) do { set_blkh_free_space(B_BLK_HEAD(p_s_bh),val); } while (0)
798 /* Get right delimiting key. -- little endian */
799 #define B_PRIGHT_DELIM_KEY(p_s_bh) (&(blk_right_delim_key(B_BLK_HEAD(p_s_bh))
801 /* Does the buffer contain a disk leaf. */
802 #define B_IS_ITEMS_LEVEL(p_s_bh) (B_LEVEL(p_s_bh) == DISK_LEAF_NODE_LEVEL)
804 /* Does the buffer contain a disk internal node */
805 #define B_IS_KEYS_LEVEL(p_s_bh) (B_LEVEL(p_s_bh) > DISK_LEAF_NODE_LEVEL \
806 && B_LEVEL(p_s_bh) <= MAX_HEIGHT)
811 /***************************************************************************/
813 /***************************************************************************/
817 // old stat data is 32 bytes long. We are going to distinguish new one by
822 __u16 sd_mode; /* file type, permissions */
823 __u16 sd_nlink; /* number of hard links */
824 __u16 sd_uid; /* owner */
825 __u16 sd_gid; /* group */
826 __u32 sd_size; /* file size */
827 __u32 sd_atime; /* time of last access */
828 __u32 sd_mtime; /* time file was last modified */
829 __u32 sd_ctime; /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */
832 __u32 sd_blocks; /* number of blocks file uses */
833 } __attribute__ ((__packed__)) u;
834 __u32 sd_first_direct_byte; /* first byte of file which is stored
835 in a direct item: except that if it
836 equals 1 it is a symlink and if it
837 equals ~(__u32)0 there is no
838 direct item. The existence of this
839 field really grates on me. Let's
840 replace it with a macro based on
841 sd_size and our tail suppression
842 policy. Someday. -Hans */
843 } __attribute__ ((__packed__));
845 #define SD_V1_SIZE (sizeof(struct stat_data_v1))
846 #define stat_data_v1(ih) (ih_version (ih) == KEY_FORMAT_3_5)
847 #define sd_v1_mode(sdp) (le16_to_cpu((sdp)->sd_mode))
848 #define set_sd_v1_mode(sdp,v) ((sdp)->sd_mode = cpu_to_le16(v))
849 #define sd_v1_nlink(sdp) (le16_to_cpu((sdp)->sd_nlink))
850 #define set_sd_v1_nlink(sdp,v) ((sdp)->sd_nlink = cpu_to_le16(v))
851 #define sd_v1_uid(sdp) (le16_to_cpu((sdp)->sd_uid))
852 #define set_sd_v1_uid(sdp,v) ((sdp)->sd_uid = cpu_to_le16(v))
853 #define sd_v1_gid(sdp) (le16_to_cpu((sdp)->sd_gid))
854 #define set_sd_v1_gid(sdp,v) ((sdp)->sd_gid = cpu_to_le16(v))
855 #define sd_v1_size(sdp) (le32_to_cpu((sdp)->sd_size))
856 #define set_sd_v1_size(sdp,v) ((sdp)->sd_size = cpu_to_le32(v))
857 #define sd_v1_atime(sdp) (le32_to_cpu((sdp)->sd_atime))
858 #define set_sd_v1_atime(sdp,v) ((sdp)->sd_atime = cpu_to_le32(v))
859 #define sd_v1_mtime(sdp) (le32_to_cpu((sdp)->sd_mtime))
860 #define set_sd_v1_mtime(sdp,v) ((sdp)->sd_mtime = cpu_to_le32(v))
861 #define sd_v1_ctime(sdp) (le32_to_cpu((sdp)->sd_ctime))
862 #define set_sd_v1_ctime(sdp,v) ((sdp)->sd_ctime = cpu_to_le32(v))
863 #define sd_v1_rdev(sdp) (le32_to_cpu((sdp)->u.sd_rdev))
864 #define set_sd_v1_rdev(sdp,v) ((sdp)->u.sd_rdev = cpu_to_le32(v))
865 #define sd_v1_blocks(sdp) (le32_to_cpu((sdp)->u.sd_blocks))
866 #define set_sd_v1_blocks(sdp,v) ((sdp)->u.sd_blocks = cpu_to_le32(v))
867 #define sd_v1_first_direct_byte(sdp) \
868 (le32_to_cpu((sdp)->sd_first_direct_byte))
869 #define set_sd_v1_first_direct_byte(sdp,v) \
870 ((sdp)->sd_first_direct_byte = cpu_to_le32(v))
872 #include <linux/ext2_fs.h>
874 /* inode flags stored in sd_attrs (nee sd_reserved) */
876 /* we want common flags to have the same values as in ext2,
877 so chattr(1) will work without problems */
878 #define REISERFS_IMMUTABLE_FL EXT2_IMMUTABLE_FL
879 #define REISERFS_APPEND_FL EXT2_APPEND_FL
880 #define REISERFS_SYNC_FL EXT2_SYNC_FL
881 #define REISERFS_NOATIME_FL EXT2_NOATIME_FL
882 #define REISERFS_NODUMP_FL EXT2_NODUMP_FL
883 #define REISERFS_SECRM_FL EXT2_SECRM_FL
884 #define REISERFS_UNRM_FL EXT2_UNRM_FL
885 #define REISERFS_COMPR_FL EXT2_COMPR_FL
886 #define REISERFS_NOTAIL_FL EXT2_NOTAIL_FL
888 /* unfortunately reiserfs sdattr is only 16 bit */
889 #define REISERFS_BARRIER_FL (EXT2_BARRIER_FL >> 16)
890 #define REISERFS_IUNLINK_FL (EXT2_IUNLINK_FL >> 16)
892 #ifdef CONFIG_VSERVER_LEGACY
893 #define REISERFS_FL_USER_VISIBLE (REISERFS_IUNLINK_FL|0x80FF)
894 #define REISERFS_FL_USER_MODIFYABLE (REISERFS_IUNLINK_FL|0x80FF)
896 #define REISERFS_FL_USER_VISIBLE 0x80FF
897 #define REISERFS_FL_USER_MODIFYABLE 0x80FF
900 /* persistent flags that file inherits from the parent directory */
901 #define REISERFS_INHERIT_MASK ( REISERFS_IMMUTABLE_FL | \
903 REISERFS_NOATIME_FL | \
904 REISERFS_NODUMP_FL | \
905 REISERFS_SECRM_FL | \
906 REISERFS_COMPR_FL | \
909 /* Stat Data on disk (reiserfs version of UFS disk inode minus the
912 __u16 sd_mode; /* file type, permissions */
913 __u16 sd_attrs; /* persistent inode flags */
914 __u32 sd_nlink; /* number of hard links */
915 __u64 sd_size; /* file size */
916 __u32 sd_uid; /* owner */
917 __u32 sd_gid; /* group */
918 __u32 sd_atime; /* time of last access */
919 __u32 sd_mtime; /* time file was last modified */
920 __u32 sd_ctime; /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */
925 //__u32 sd_first_direct_byte;
926 /* first byte of file which is stored in a
927 direct item: except that if it equals 1
928 it is a symlink and if it equals
929 ~(__u32)0 there is no direct item. The
930 existence of this field really grates
931 on me. Let's replace it with a macro
932 based on sd_size and our tail
933 suppression policy? */
934 } __attribute__ ((__packed__)) u;
935 } __attribute__ ((__packed__));
937 // this is 44 bytes long
939 #define SD_SIZE (sizeof(struct stat_data))
940 #define SD_V2_SIZE SD_SIZE
941 #define stat_data_v2(ih) (ih_version (ih) == KEY_FORMAT_3_6)
942 #define sd_v2_mode(sdp) (le16_to_cpu((sdp)->sd_mode))
943 #define set_sd_v2_mode(sdp,v) ((sdp)->sd_mode = cpu_to_le16(v))
945 /* set_sd_reserved */
946 #define sd_v2_nlink(sdp) (le32_to_cpu((sdp)->sd_nlink))
947 #define set_sd_v2_nlink(sdp,v) ((sdp)->sd_nlink = cpu_to_le32(v))
948 #define sd_v2_size(sdp) (le64_to_cpu((sdp)->sd_size))
949 #define set_sd_v2_size(sdp,v) ((sdp)->sd_size = cpu_to_le64(v))
950 #define sd_v2_uid(sdp) (le32_to_cpu((sdp)->sd_uid))
951 #define set_sd_v2_uid(sdp,v) ((sdp)->sd_uid = cpu_to_le32(v))
952 #define sd_v2_gid(sdp) (le32_to_cpu((sdp)->sd_gid))
953 #define set_sd_v2_gid(sdp,v) ((sdp)->sd_gid = cpu_to_le32(v))
954 #define sd_v2_atime(sdp) (le32_to_cpu((sdp)->sd_atime))
955 #define set_sd_v2_atime(sdp,v) ((sdp)->sd_atime = cpu_to_le32(v))
956 #define sd_v2_mtime(sdp) (le32_to_cpu((sdp)->sd_mtime))
957 #define set_sd_v2_mtime(sdp,v) ((sdp)->sd_mtime = cpu_to_le32(v))
958 #define sd_v2_ctime(sdp) (le32_to_cpu((sdp)->sd_ctime))
959 #define set_sd_v2_ctime(sdp,v) ((sdp)->sd_ctime = cpu_to_le32(v))
960 #define sd_v2_blocks(sdp) (le32_to_cpu((sdp)->sd_blocks))
961 #define set_sd_v2_blocks(sdp,v) ((sdp)->sd_blocks = cpu_to_le32(v))
962 #define sd_v2_rdev(sdp) (le32_to_cpu((sdp)->u.sd_rdev))
963 #define set_sd_v2_rdev(sdp,v) ((sdp)->u.sd_rdev = cpu_to_le32(v))
964 #define sd_v2_generation(sdp) (le32_to_cpu((sdp)->u.sd_generation))
965 #define set_sd_v2_generation(sdp,v) ((sdp)->u.sd_generation = cpu_to_le32(v))
966 #define sd_v2_attrs(sdp) (le16_to_cpu((sdp)->sd_attrs))
967 #define set_sd_v2_attrs(sdp,v) ((sdp)->sd_attrs = cpu_to_le16(v))
970 /***************************************************************************/
971 /* DIRECTORY STRUCTURE */
972 /***************************************************************************/
974 Picture represents the structure of directory items
975 ________________________________________________
976 | Array of | | | | | |
977 | directory |N-1| N-2 | .... | 1st |0th|
978 | entry headers | | | | | |
979 |_______________|___|_____|________|_______|___|
980 <---- directory entries ------>
982 First directory item has k_offset component 1. We store "." and ".."
983 in one item, always, we never split "." and ".." into differing
984 items. This makes, among other things, the code for removing
985 directories simpler. */
987 #define SD_UNIQUENESS 0
989 #define DOT_DOT_OFFSET 2
990 #define DIRENTRY_UNIQUENESS 500
993 #define FIRST_ITEM_OFFSET 1
996 Q: How to get key of object pointed to by entry from entry?
998 A: Each directory entry has its header. This header has deh_dir_id and deh_objectid fields, those are key
999 of object, entry points to */
1002 Directory will someday contain stat data of object */
1006 struct reiserfs_de_head
1008 __u32 deh_offset; /* third component of the directory entry key */
1009 __u32 deh_dir_id; /* objectid of the parent directory of the object, that is referenced
1010 by directory entry */
1011 __u32 deh_objectid; /* objectid of the object, that is referenced by directory entry */
1012 __u16 deh_location; /* offset of name in the whole item */
1013 __u16 deh_state; /* whether 1) entry contains stat data (for future), and 2) whether
1014 entry is hidden (unlinked) */
1015 } __attribute__ ((__packed__));
1016 #define DEH_SIZE sizeof(struct reiserfs_de_head)
1017 #define deh_offset(p_deh) (le32_to_cpu((p_deh)->deh_offset))
1018 #define deh_dir_id(p_deh) (le32_to_cpu((p_deh)->deh_dir_id))
1019 #define deh_objectid(p_deh) (le32_to_cpu((p_deh)->deh_objectid))
1020 #define deh_location(p_deh) (le16_to_cpu((p_deh)->deh_location))
1021 #define deh_state(p_deh) (le16_to_cpu((p_deh)->deh_state))
1023 #define put_deh_offset(p_deh,v) ((p_deh)->deh_offset = cpu_to_le32((v)))
1024 #define put_deh_dir_id(p_deh,v) ((p_deh)->deh_dir_id = cpu_to_le32((v)))
1025 #define put_deh_objectid(p_deh,v) ((p_deh)->deh_objectid = cpu_to_le32((v)))
1026 #define put_deh_location(p_deh,v) ((p_deh)->deh_location = cpu_to_le16((v)))
1027 #define put_deh_state(p_deh,v) ((p_deh)->deh_state = cpu_to_le16((v)))
1029 /* empty directory contains two entries "." and ".." and their headers */
1030 #define EMPTY_DIR_SIZE \
1031 (DEH_SIZE * 2 + ROUND_UP (strlen (".")) + ROUND_UP (strlen ("..")))
1033 /* old format directories have this size when empty */
1034 #define EMPTY_DIR_SIZE_V1 (DEH_SIZE * 2 + 3)
1036 #define DEH_Statdata 0 /* not used now */
1037 #define DEH_Visible 2
1039 /* 64 bit systems (and the S/390) need to be aligned explicitly -jdm */
1040 #if BITS_PER_LONG == 64 || defined(__s390__) || defined(__hppa__)
1041 # define ADDR_UNALIGNED_BITS (3)
1044 /* These are only used to manipulate deh_state.
1045 * Because of this, we'll use the ext2_ bit routines,
1046 * since they are little endian */
1047 #ifdef ADDR_UNALIGNED_BITS
1049 # define aligned_address(addr) ((void *)((long)(addr) & ~((1UL << ADDR_UNALIGNED_BITS) - 1)))
1050 # define unaligned_offset(addr) (((int)((long)(addr) & ((1 << ADDR_UNALIGNED_BITS) - 1))) << 3)
1052 # define set_bit_unaligned(nr, addr) ext2_set_bit((nr) + unaligned_offset(addr), aligned_address(addr))
1053 # define clear_bit_unaligned(nr, addr) ext2_clear_bit((nr) + unaligned_offset(addr), aligned_address(addr))
1054 # define test_bit_unaligned(nr, addr) ext2_test_bit((nr) + unaligned_offset(addr), aligned_address(addr))
1058 # define set_bit_unaligned(nr, addr) ext2_set_bit(nr, addr)
1059 # define clear_bit_unaligned(nr, addr) ext2_clear_bit(nr, addr)
1060 # define test_bit_unaligned(nr, addr) ext2_test_bit(nr, addr)
1064 #define mark_de_with_sd(deh) set_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
1065 #define mark_de_without_sd(deh) clear_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
1066 #define mark_de_visible(deh) set_bit_unaligned (DEH_Visible, &((deh)->deh_state))
1067 #define mark_de_hidden(deh) clear_bit_unaligned (DEH_Visible, &((deh)->deh_state))
1069 #define de_with_sd(deh) test_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
1070 #define de_visible(deh) test_bit_unaligned (DEH_Visible, &((deh)->deh_state))
1071 #define de_hidden(deh) !test_bit_unaligned (DEH_Visible, &((deh)->deh_state))
1073 extern void make_empty_dir_item_v1 (char * body, __u32 dirid, __u32 objid,
1074 __u32 par_dirid, __u32 par_objid);
1075 extern void make_empty_dir_item (char * body, __u32 dirid, __u32 objid,
1076 __u32 par_dirid, __u32 par_objid);
1078 /* array of the entry headers */
1080 #define B_I_PITEM(bh,ih) ( (bh)->b_data + ih_location(ih) )
1081 #define B_I_DEH(bh,ih) ((struct reiserfs_de_head *)(B_I_PITEM(bh,ih)))
1083 /* length of the directory entry in directory item. This define
1084 calculates length of i-th directory entry using directory entry
1085 locations from dir entry head. When it calculates length of 0-th
1086 directory entry, it uses length of whole item in place of entry
1087 location of the non-existent following entry in the calculation.
1088 See picture above.*/
1090 #define I_DEH_N_ENTRY_LENGTH(ih,deh,i) \
1091 ((i) ? (deh_location((deh)-1) - deh_location((deh))) : (ih_item_len((ih)) - deh_location((deh))))
1093 static inline int entry_length (const struct buffer_head * bh,
1094 const struct item_head * ih, int pos_in_item)
1096 struct reiserfs_de_head * deh;
1098 deh = B_I_DEH (bh, ih) + pos_in_item;
1100 return deh_location(deh-1) - deh_location(deh);
1102 return ih_item_len(ih) - deh_location(deh);
1107 /* number of entries in the directory item, depends on ENTRY_COUNT being at the start of directory dynamic data. */
1108 #define I_ENTRY_COUNT(ih) (ih_entry_count((ih)))
1111 /* name by bh, ih and entry_num */
1112 #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))))
1114 // two entries per block (at least)
1115 #define REISERFS_MAX_NAME(block_size) 255
1118 /* this structure is used for operations on directory entries. It is
1119 not a disk structure. */
1120 /* When reiserfs_find_entry or search_by_entry_key find directory
1121 entry, they return filled reiserfs_dir_entry structure */
1122 struct reiserfs_dir_entry
1124 struct buffer_head * de_bh;
1126 struct item_head * de_ih;
1128 struct reiserfs_de_head * de_deh;
1132 char * de_gen_number_bit_string;
1137 struct cpu_key de_entry_key;
1140 /* these defines are useful when a particular member of a reiserfs_dir_entry is needed */
1142 /* pointer to file name, stored in entry */
1143 #define B_I_DEH_ENTRY_FILE_NAME(bh,ih,deh) (B_I_PITEM (bh, ih) + deh_location(deh))
1145 /* length of name */
1146 #define I_DEH_N_ENTRY_FILE_NAME_LENGTH(ih,deh,entry_num) \
1147 (I_DEH_N_ENTRY_LENGTH (ih, deh, entry_num) - (de_with_sd (deh) ? SD_SIZE : 0))
1151 /* hash value occupies bits from 7 up to 30 */
1152 #define GET_HASH_VALUE(offset) ((offset) & 0x7fffff80LL)
1153 /* generation number occupies 7 bits starting from 0 up to 6 */
1154 #define GET_GENERATION_NUMBER(offset) ((offset) & 0x7fLL)
1155 #define MAX_GENERATION_NUMBER 127
1157 #define SET_GENERATION_NUMBER(offset,gen_number) (GET_HASH_VALUE(offset)|(gen_number))
1161 * Picture represents an internal node of the reiserfs tree
1162 * ______________________________________________________
1163 * | | Array of | Array of | Free |
1164 * |block | keys | pointers | space |
1165 * | head | N | N+1 | |
1166 * |______|_______________|___________________|___________|
1169 /***************************************************************************/
1171 /***************************************************************************/
1172 /* Disk child pointer: The pointer from an internal node of the tree
1173 to a node that is on disk. */
1175 __u32 dc_block_number; /* Disk child's block number. */
1176 __u16 dc_size; /* Disk child's used space. */
1180 #define DC_SIZE (sizeof(struct disk_child))
1181 #define dc_block_number(dc_p) (le32_to_cpu((dc_p)->dc_block_number))
1182 #define dc_size(dc_p) (le16_to_cpu((dc_p)->dc_size))
1183 #define put_dc_block_number(dc_p, val) do { (dc_p)->dc_block_number = cpu_to_le32(val); } while(0)
1184 #define put_dc_size(dc_p, val) do { (dc_p)->dc_size = cpu_to_le16(val); } while(0)
1186 /* Get disk child by buffer header and position in the tree node. */
1187 #define B_N_CHILD(p_s_bh,n_pos) ((struct disk_child *)\
1188 ((p_s_bh)->b_data+BLKH_SIZE+B_NR_ITEMS(p_s_bh)*KEY_SIZE+DC_SIZE*(n_pos)))
1190 /* Get disk child number by buffer header and position in the tree node. */
1191 #define B_N_CHILD_NUM(p_s_bh,n_pos) (dc_block_number(B_N_CHILD(p_s_bh,n_pos)))
1192 #define PUT_B_N_CHILD_NUM(p_s_bh,n_pos, val) (put_dc_block_number(B_N_CHILD(p_s_bh,n_pos), val ))
1194 /* maximal value of field child_size in structure disk_child */
1195 /* child size is the combined size of all items and their headers */
1196 #define MAX_CHILD_SIZE(bh) ((int)( (bh)->b_size - BLKH_SIZE ))
1198 /* amount of used space in buffer (not including block head) */
1199 #define B_CHILD_SIZE(cur) (MAX_CHILD_SIZE(cur)-(B_FREE_SPACE(cur)))
1201 /* max and min number of keys in internal node */
1202 #define MAX_NR_KEY(bh) ( (MAX_CHILD_SIZE(bh)-DC_SIZE)/(KEY_SIZE+DC_SIZE) )
1203 #define MIN_NR_KEY(bh) (MAX_NR_KEY(bh)/2)
1205 /***************************************************************************/
1206 /* PATH STRUCTURES AND DEFINES */
1207 /***************************************************************************/
1210 /* Search_by_key fills up the path from the root to the leaf as it descends the tree looking for the
1211 key. It uses reiserfs_bread to try to find buffers in the cache given their block number. If it
1212 does not find them in the cache it reads them from disk. For each node search_by_key finds using
1213 reiserfs_bread it then uses bin_search to look through that node. bin_search will find the
1214 position of the block_number of the next node if it is looking through an internal node. If it
1215 is looking through a leaf node bin_search will find the position of the item which has key either
1216 equal to given key, or which is the maximal key less than the given key. */
1218 struct path_element {
1219 struct buffer_head * pe_buffer; /* Pointer to the buffer at the path in the tree. */
1220 int pe_position; /* Position in the tree node which is placed in the */
1224 #define MAX_HEIGHT 5 /* maximal height of a tree. don't change this without changing JOURNAL_PER_BALANCE_CNT */
1225 #define EXTENDED_MAX_HEIGHT 7 /* Must be equals MAX_HEIGHT + FIRST_PATH_ELEMENT_OFFSET */
1226 #define FIRST_PATH_ELEMENT_OFFSET 2 /* Must be equal to at least 2. */
1228 #define ILLEGAL_PATH_ELEMENT_OFFSET 1 /* Must be equal to FIRST_PATH_ELEMENT_OFFSET - 1 */
1229 #define MAX_FEB_SIZE 6 /* this MUST be MAX_HEIGHT + 1. See about FEB below */
1233 /* We need to keep track of who the ancestors of nodes are. When we
1234 perform a search we record which nodes were visited while
1235 descending the tree looking for the node we searched for. This list
1236 of nodes is called the path. This information is used while
1237 performing balancing. Note that this path information may become
1238 invalid, and this means we must check it when using it to see if it
1239 is still valid. You'll need to read search_by_key and the comments
1240 in it, especially about decrement_counters_in_path(), to understand
1243 Paths make the code so much harder to work with and debug.... An
1244 enormous number of bugs are due to them, and trying to write or modify
1245 code that uses them just makes my head hurt. They are based on an
1246 excessive effort to avoid disturbing the precious VFS code.:-( The
1247 gods only know how we are going to SMP the code that uses them.
1248 znodes are the way! */
1250 #define PATH_READA 0x1 /* do read ahead */
1251 #define PATH_READA_BACK 0x2 /* read backwards */
1254 int path_length; /* Length of the array above. */
1256 struct path_element path_elements[EXTENDED_MAX_HEIGHT]; /* Array of the path elements. */
1260 #define pos_in_item(path) ((path)->pos_in_item)
1262 #define INITIALIZE_PATH(var) \
1263 struct path var = {.path_length = ILLEGAL_PATH_ELEMENT_OFFSET, .reada = 0,}
1265 /* Get path element by path and path position. */
1266 #define PATH_OFFSET_PELEMENT(p_s_path,n_offset) ((p_s_path)->path_elements +(n_offset))
1268 /* Get buffer header at the path by path and path position. */
1269 #define PATH_OFFSET_PBUFFER(p_s_path,n_offset) (PATH_OFFSET_PELEMENT(p_s_path,n_offset)->pe_buffer)
1271 /* Get position in the element at the path by path and path position. */
1272 #define PATH_OFFSET_POSITION(p_s_path,n_offset) (PATH_OFFSET_PELEMENT(p_s_path,n_offset)->pe_position)
1275 #define PATH_PLAST_BUFFER(p_s_path) (PATH_OFFSET_PBUFFER((p_s_path), (p_s_path)->path_length))
1276 /* you know, to the person who didn't
1277 write this the macro name does not
1278 at first suggest what it does.
1279 Maybe POSITION_FROM_PATH_END? Or
1280 maybe we should just focus on
1281 dumping paths... -Hans */
1282 #define PATH_LAST_POSITION(p_s_path) (PATH_OFFSET_POSITION((p_s_path), (p_s_path)->path_length))
1285 #define PATH_PITEM_HEAD(p_s_path) B_N_PITEM_HEAD(PATH_PLAST_BUFFER(p_s_path),PATH_LAST_POSITION(p_s_path))
1287 /* in do_balance leaf has h == 0 in contrast with path structure,
1288 where root has level == 0. That is why we need these defines */
1289 #define PATH_H_PBUFFER(p_s_path, h) PATH_OFFSET_PBUFFER (p_s_path, p_s_path->path_length - (h)) /* tb->S[h] */
1290 #define PATH_H_PPARENT(path, h) PATH_H_PBUFFER (path, (h) + 1) /* tb->F[h] or tb->S[0]->b_parent */
1291 #define PATH_H_POSITION(path, h) PATH_OFFSET_POSITION (path, path->path_length - (h))
1292 #define PATH_H_B_ITEM_ORDER(path, h) PATH_H_POSITION(path, h + 1) /* tb->S[h]->b_item_order */
1294 #define PATH_H_PATH_OFFSET(p_s_path, n_h) ((p_s_path)->path_length - (n_h))
1296 #define get_last_bh(path) PATH_PLAST_BUFFER(path)
1297 #define get_ih(path) PATH_PITEM_HEAD(path)
1298 #define get_item_pos(path) PATH_LAST_POSITION(path)
1299 #define get_item(path) ((void *)B_N_PITEM(PATH_PLAST_BUFFER(path), PATH_LAST_POSITION (path)))
1300 #define item_moved(ih,path) comp_items(ih, path)
1301 #define path_changed(ih,path) comp_items (ih, path)
1304 /***************************************************************************/
1306 /***************************************************************************/
1308 /* Size of pointer to the unformatted node. */
1309 #define UNFM_P_SIZE (sizeof(unp_t))
1310 #define UNFM_P_SHIFT 2
1312 // in in-core inode key is stored on le form
1313 #define INODE_PKEY(inode) ((struct reiserfs_key *)(REISERFS_I(inode)->i_key))
1315 #define MAX_UL_INT 0xffffffff
1316 #define MAX_INT 0x7ffffff
1317 #define MAX_US_INT 0xffff
1319 // reiserfs version 2 has max offset 60 bits. Version 1 - 32 bit offset
1320 #define U32_MAX (~(__u32)0)
1322 static inline loff_t max_reiserfs_offset (struct inode * inode)
1324 if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5)
1325 return (loff_t)U32_MAX;
1327 return (loff_t)((~(__u64)0) >> 4);
1331 /*#define MAX_KEY_UNIQUENESS MAX_UL_INT*/
1332 #define MAX_KEY_OBJECTID MAX_UL_INT
1335 #define MAX_B_NUM MAX_UL_INT
1336 #define MAX_FC_NUM MAX_US_INT
1339 /* the purpose is to detect overflow of an unsigned short */
1340 #define REISERFS_LINK_MAX (MAX_US_INT - 1000)
1343 /* The following defines are used in reiserfs_insert_item and reiserfs_append_item */
1344 #define REISERFS_KERNEL_MEM 0 /* reiserfs kernel memory mode */
1345 #define REISERFS_USER_MEM 1 /* reiserfs user memory mode */
1347 #define fs_generation(s) (REISERFS_SB(s)->s_generation_counter)
1348 #define get_generation(s) atomic_read (&fs_generation(s))
1349 #define FILESYSTEM_CHANGED_TB(tb) (get_generation((tb)->tb_sb) != (tb)->fs_gen)
1350 #define __fs_changed(gen,s) (gen != get_generation (s))
1351 #define fs_changed(gen,s) ({cond_resched(); __fs_changed(gen, s);})
1354 /***************************************************************************/
1356 /***************************************************************************/
1358 #define VI_TYPE_LEFT_MERGEABLE 1
1359 #define VI_TYPE_RIGHT_MERGEABLE 2
1361 /* To make any changes in the tree we always first find node, that
1362 contains item to be changed/deleted or place to insert a new
1363 item. We call this node S. To do balancing we need to decide what
1364 we will shift to left/right neighbor, or to a new node, where new
1365 item will be etc. To make this analysis simpler we build virtual
1366 node. Virtual node is an array of items, that will replace items of
1367 node S. (For instance if we are going to delete an item, virtual
1368 node does not contain it). Virtual node keeps information about
1369 item sizes and types, mergeability of first and last items, sizes
1370 of all entries in directory item. We use this array of items when
1371 calculating what we can shift to neighbors and how many nodes we
1372 have to have if we do not any shiftings, if we shift to left/right
1373 neighbor or to both. */
1376 int vi_index; // index in the array of item operations
1377 unsigned short vi_type; // left/right mergeability
1378 unsigned short vi_item_len; /* length of item that it will have after balancing */
1379 struct item_head * vi_ih;
1380 const char * vi_item; // body of item (old or new)
1381 const void * vi_new_data; // 0 always but paste mode
1382 void * vi_uarea; // item specific area
1388 char * vn_free_ptr; /* this is a pointer to the free space in the buffer */
1389 unsigned short vn_nr_item; /* number of items in virtual node */
1390 short vn_size; /* size of node , that node would have if it has unlimited size and no balancing is performed */
1391 short vn_mode; /* mode of balancing (paste, insert, delete, cut) */
1392 short vn_affected_item_num;
1393 short vn_pos_in_item;
1394 struct item_head * vn_ins_ih; /* item header of inserted item, 0 for other modes */
1395 const void * vn_data;
1396 struct virtual_item * vn_vi; /* array of items (including a new one, excluding item to be deleted) */
1399 /* used by directory items when creating virtual nodes */
1400 struct direntry_uarea {
1403 __u16 entry_sizes[1];
1404 } __attribute__ ((__packed__)) ;
1407 /***************************************************************************/
1409 /***************************************************************************/
1411 /* This temporary structure is used in tree balance algorithms, and
1412 constructed as we go to the extent that its various parts are
1413 needed. It contains arrays of nodes that can potentially be
1414 involved in the balancing of node S, and parameters that define how
1415 each of the nodes must be balanced. Note that in these algorithms
1416 for balancing the worst case is to need to balance the current node
1417 S and the left and right neighbors and all of their parents plus
1418 create a new node. We implement S1 balancing for the leaf nodes
1419 and S0 balancing for the internal nodes (S1 and S0 are defined in
1422 #define MAX_FREE_BLOCK 7 /* size of the array of buffers to free at end of do_balance */
1424 /* maximum number of FEB blocknrs on a single level */
1425 #define MAX_AMOUNT_NEEDED 2
1427 /* someday somebody will prefix every field in this struct with tb_ */
1431 int need_balance_dirty;
1432 struct super_block * tb_sb;
1433 struct reiserfs_transaction_handle *transaction_handle ;
1434 struct path * tb_path;
1435 struct buffer_head * L[MAX_HEIGHT]; /* array of left neighbors of nodes in the path */
1436 struct buffer_head * R[MAX_HEIGHT]; /* array of right neighbors of nodes in the path*/
1437 struct buffer_head * FL[MAX_HEIGHT]; /* array of fathers of the left neighbors */
1438 struct buffer_head * FR[MAX_HEIGHT]; /* array of fathers of the right neighbors */
1439 struct buffer_head * CFL[MAX_HEIGHT]; /* array of common parents of center node and its left neighbor */
1440 struct buffer_head * CFR[MAX_HEIGHT]; /* array of common parents of center node and its right neighbor */
1442 struct buffer_head * FEB[MAX_FEB_SIZE]; /* array of empty buffers. Number of buffers in array equals
1444 struct buffer_head * used[MAX_FEB_SIZE];
1445 struct buffer_head * thrown[MAX_FEB_SIZE];
1446 int lnum[MAX_HEIGHT]; /* array of number of items which must be
1447 shifted to the left in order to balance the
1448 current node; for leaves includes item that
1449 will be partially shifted; for internal
1450 nodes, it is the number of child pointers
1451 rather than items. It includes the new item
1452 being created. The code sometimes subtracts
1453 one to get the number of wholly shifted
1454 items for other purposes. */
1455 int rnum[MAX_HEIGHT]; /* substitute right for left in comment above */
1456 int lkey[MAX_HEIGHT]; /* array indexed by height h mapping the key delimiting L[h] and
1457 S[h] to its item number within the node CFL[h] */
1458 int rkey[MAX_HEIGHT]; /* substitute r for l in comment above */
1459 int insert_size[MAX_HEIGHT]; /* the number of bytes by we are trying to add or remove from
1460 S[h]. A negative value means removing. */
1461 int blknum[MAX_HEIGHT]; /* number of nodes that will replace node S[h] after
1462 balancing on the level h of the tree. If 0 then S is
1463 being deleted, if 1 then S is remaining and no new nodes
1464 are being created, if 2 or 3 then 1 or 2 new nodes is
1467 /* fields that are used only for balancing leaves of the tree */
1468 int cur_blknum; /* number of empty blocks having been already allocated */
1469 int s0num; /* number of items that fall into left most node when S[0] splits */
1470 int s1num; /* number of items that fall into first new node when S[0] splits */
1471 int s2num; /* number of items that fall into second new node when S[0] splits */
1472 int lbytes; /* number of bytes which can flow to the left neighbor from the left */
1473 /* most liquid item that cannot be shifted from S[0] entirely */
1474 /* if -1 then nothing will be partially shifted */
1475 int rbytes; /* number of bytes which will flow to the right neighbor from the right */
1476 /* most liquid item that cannot be shifted from S[0] entirely */
1477 /* if -1 then nothing will be partially shifted */
1478 int s1bytes; /* number of bytes which flow to the first new node when S[0] splits */
1479 /* note: if S[0] splits into 3 nodes, then items do not need to be cut */
1481 struct buffer_head * buf_to_free[MAX_FREE_BLOCK]; /* buffers which are to be freed after do_balance finishes by unfix_nodes */
1482 char * vn_buf; /* kmalloced memory. Used to create
1483 virtual node and keep map of
1484 dirtied bitmap blocks */
1485 int vn_buf_size; /* size of the vn_buf */
1486 struct virtual_node * tb_vn; /* VN starts after bitmap of bitmap blocks */
1488 int fs_gen; /* saved value of `reiserfs_generation' counter
1489 see FILESYSTEM_CHANGED() macro in reiserfs_fs.h */
1490 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
1491 struct reiserfs_key key; /* key pointer, to pass to block allocator or
1492 another low-level subsystem */
1496 /* These are modes of balancing */
1498 /* When inserting an item. */
1499 #define M_INSERT 'i'
1500 /* When inserting into (directories only) or appending onto an already
1503 /* When deleting an item. */
1504 #define M_DELETE 'd'
1505 /* When truncating an item or removing an entry from a (directory) item. */
1508 /* used when balancing on leaf level skipped (in reiserfsck) */
1509 #define M_INTERNAL 'n'
1511 /* When further balancing is not needed, then do_balance does not need
1513 #define M_SKIP_BALANCING 's'
1514 #define M_CONVERT 'v'
1516 /* modes of leaf_move_items */
1517 #define LEAF_FROM_S_TO_L 0
1518 #define LEAF_FROM_S_TO_R 1
1519 #define LEAF_FROM_R_TO_L 2
1520 #define LEAF_FROM_L_TO_R 3
1521 #define LEAF_FROM_S_TO_SNEW 4
1523 #define FIRST_TO_LAST 0
1524 #define LAST_TO_FIRST 1
1526 /* used in do_balance for passing parent of node information that has
1527 been gotten from tb struct */
1528 struct buffer_info {
1529 struct tree_balance * tb;
1530 struct buffer_head * bi_bh;
1531 struct buffer_head * bi_parent;
1536 /* there are 4 types of items: stat data, directory item, indirect, direct.
1537 +-------------------+------------+--------------+------------+
1538 | | k_offset | k_uniqueness | mergeable? |
1539 +-------------------+------------+--------------+------------+
1540 | stat data | 0 | 0 | no |
1541 +-------------------+------------+--------------+------------+
1542 | 1st directory item| DOT_OFFSET |DIRENTRY_UNIQUENESS| no |
1543 | non 1st directory | hash value | | yes |
1545 +-------------------+------------+--------------+------------+
1546 | indirect item | offset + 1 |TYPE_INDIRECT | if this is not the first indirect item of the object
1547 +-------------------+------------+--------------+------------+
1548 | direct item | offset + 1 |TYPE_DIRECT | if not this is not the first direct item of the object
1549 +-------------------+------------+--------------+------------+
1552 struct item_operations {
1553 int (*bytes_number) (struct item_head * ih, int block_size);
1554 void (*decrement_key) (struct cpu_key *);
1555 int (*is_left_mergeable) (struct reiserfs_key * ih, unsigned long bsize);
1556 void (*print_item) (struct item_head *, char * item);
1557 void (*check_item) (struct item_head *, char * item);
1559 int (*create_vi) (struct virtual_node * vn, struct virtual_item * vi,
1560 int is_affected, int insert_size);
1561 int (*check_left) (struct virtual_item * vi, int free,
1562 int start_skip, int end_skip);
1563 int (*check_right) (struct virtual_item * vi, int free);
1564 int (*part_size) (struct virtual_item * vi, int from, int to);
1565 int (*unit_num) (struct virtual_item * vi);
1566 void (*print_vi) (struct virtual_item * vi);
1570 extern struct item_operations * item_ops [TYPE_ANY + 1];
1572 #define op_bytes_number(ih,bsize) item_ops[le_ih_k_type (ih)]->bytes_number (ih, bsize)
1573 #define op_is_left_mergeable(key,bsize) item_ops[le_key_k_type (le_key_version (key), key)]->is_left_mergeable (key, bsize)
1574 #define op_print_item(ih,item) item_ops[le_ih_k_type (ih)]->print_item (ih, item)
1575 #define op_check_item(ih,item) item_ops[le_ih_k_type (ih)]->check_item (ih, item)
1576 #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)
1577 #define op_check_left(vi,free,start_skip,end_skip) item_ops[(vi)->vi_index]->check_left (vi, free, start_skip, end_skip)
1578 #define op_check_right(vi,free) item_ops[(vi)->vi_index]->check_right (vi, free)
1579 #define op_part_size(vi,from,to) item_ops[(vi)->vi_index]->part_size (vi, from, to)
1580 #define op_unit_num(vi) item_ops[(vi)->vi_index]->unit_num (vi)
1581 #define op_print_vi(vi) item_ops[(vi)->vi_index]->print_vi (vi)
1585 #define COMP_SHORT_KEYS comp_short_keys
1587 /* number of blocks pointed to by the indirect item */
1588 #define I_UNFM_NUM(p_s_ih) ( ih_item_len(p_s_ih) / UNFM_P_SIZE )
1590 /* the used space within the unformatted node corresponding to pos within the item pointed to by ih */
1591 #define I_POS_UNFM_SIZE(ih,pos,size) (((pos) == I_UNFM_NUM(ih) - 1 ) ? (size) - ih_free_space(ih) : (size))
1593 /* number of bytes contained by the direct item or the unformatted nodes the indirect item points to */
1596 /* get the item header */
1597 #define B_N_PITEM_HEAD(bh,item_num) ( (struct item_head * )((bh)->b_data + BLKH_SIZE) + (item_num) )
1600 #define B_N_PDELIM_KEY(bh,item_num) ( (struct reiserfs_key * )((bh)->b_data + BLKH_SIZE) + (item_num) )
1603 #define B_N_PKEY(bh,item_num) ( &(B_N_PITEM_HEAD(bh,item_num)->ih_key) )
1606 #define B_N_PITEM(bh,item_num) ( (bh)->b_data + ih_location(B_N_PITEM_HEAD((bh),(item_num))))
1608 /* get the stat data by the buffer header and the item order */
1609 #define B_N_STAT_DATA(bh,nr) \
1610 ( (struct stat_data *)((bh)->b_data + ih_location(B_N_PITEM_HEAD((bh),(nr))) ) )
1612 /* following defines use reiserfs buffer header and item header */
1615 #define B_I_STAT_DATA(bh, ih) ( (struct stat_data * )((bh)->b_data + ih_location(ih)) )
1617 // this is 3976 for size==4096
1618 #define MAX_DIRECT_ITEM_LEN(size) ((size) - BLKH_SIZE - 2*IH_SIZE - SD_SIZE - UNFM_P_SIZE)
1620 /* indirect items consist of entries which contain blocknrs, pos
1621 indicates which entry, and B_I_POS_UNFM_POINTER resolves to the
1622 blocknr contained by the entry pos points to */
1623 #define B_I_POS_UNFM_POINTER(bh,ih,pos) le32_to_cpu(*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)))
1624 #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)
1626 struct reiserfs_iget_args {
1631 /***************************************************************************/
1632 /* FUNCTION DECLARATIONS */
1633 /***************************************************************************/
1635 /*#ifdef __KERNEL__*/
1636 #define get_journal_desc_magic(bh) (bh->b_data + bh->b_size - 12)
1638 #define journal_trans_half(blocksize) \
1639 ((blocksize - sizeof (struct reiserfs_journal_desc) + sizeof (__u32) - 12) / sizeof (__u32))
1641 /* journal.c see journal.c for all the comments here */
1643 /* first block written in a commit. */
1644 struct reiserfs_journal_desc {
1645 __u32 j_trans_id ; /* id of commit */
1646 __u32 j_len ; /* length of commit. len +1 is the commit block */
1647 __u32 j_mount_id ; /* mount id of this trans*/
1648 __u32 j_realblock[1] ; /* real locations for each block */
1651 #define get_desc_trans_id(d) le32_to_cpu((d)->j_trans_id)
1652 #define get_desc_trans_len(d) le32_to_cpu((d)->j_len)
1653 #define get_desc_mount_id(d) le32_to_cpu((d)->j_mount_id)
1655 #define set_desc_trans_id(d,val) do { (d)->j_trans_id = cpu_to_le32 (val); } while (0)
1656 #define set_desc_trans_len(d,val) do { (d)->j_len = cpu_to_le32 (val); } while (0)
1657 #define set_desc_mount_id(d,val) do { (d)->j_mount_id = cpu_to_le32 (val); } while (0)
1659 /* last block written in a commit */
1660 struct reiserfs_journal_commit {
1661 __u32 j_trans_id ; /* must match j_trans_id from the desc block */
1662 __u32 j_len ; /* ditto */
1663 __u32 j_realblock[1] ; /* real locations for each block */
1666 #define get_commit_trans_id(c) le32_to_cpu((c)->j_trans_id)
1667 #define get_commit_trans_len(c) le32_to_cpu((c)->j_len)
1668 #define get_commit_mount_id(c) le32_to_cpu((c)->j_mount_id)
1670 #define set_commit_trans_id(c,val) do { (c)->j_trans_id = cpu_to_le32 (val); } while (0)
1671 #define set_commit_trans_len(c,val) do { (c)->j_len = cpu_to_le32 (val); } while (0)
1673 /* this header block gets written whenever a transaction is considered fully flushed, and is more recent than the
1674 ** last fully flushed transaction. fully flushed means all the log blocks and all the real blocks are on disk,
1675 ** and this transaction does not need to be replayed.
1677 struct reiserfs_journal_header {
1678 __u32 j_last_flush_trans_id ; /* id of last fully flushed transaction */
1679 __u32 j_first_unflushed_offset ; /* offset in the log of where to start replay after a crash */
1681 /* 12 */ struct journal_params jh_journal;
1684 /* biggest tunable defines are right here */
1685 #define JOURNAL_BLOCK_COUNT 8192 /* number of blocks in the journal */
1686 #define JOURNAL_TRANS_MAX_DEFAULT 1024 /* biggest possible single transaction, don't change for now (8/3/99) */
1687 #define JOURNAL_TRANS_MIN_DEFAULT 256
1688 #define JOURNAL_MAX_BATCH_DEFAULT 900 /* max blocks to batch into one transaction, don't make this any bigger than 900 */
1689 #define JOURNAL_MIN_RATIO 2
1690 #define JOURNAL_MAX_COMMIT_AGE 30
1691 #define JOURNAL_MAX_TRANS_AGE 30
1692 #define JOURNAL_PER_BALANCE_CNT (3 * (MAX_HEIGHT-2) + 9)
1694 #define REISERFS_QUOTA_TRANS_BLOCKS 2 /* We need to update data and inode (atime) */
1695 #define REISERFS_QUOTA_INIT_BLOCKS (DQUOT_MAX_WRITES*(JOURNAL_PER_BALANCE_CNT+2)+1) /* 1 balancing, 1 bitmap, 1 data per write + stat data update */
1697 #define REISERFS_QUOTA_TRANS_BLOCKS 0
1698 #define REISERFS_QUOTA_INIT_BLOCKS 0
1701 /* both of these can be as low as 1, or as high as you want. The min is the
1702 ** number of 4k bitmap nodes preallocated on mount. New nodes are allocated
1703 ** as needed, and released when transactions are committed. On release, if
1704 ** the current number of nodes is > max, the node is freed, otherwise,
1705 ** it is put on a free list for faster use later.
1707 #define REISERFS_MIN_BITMAP_NODES 10
1708 #define REISERFS_MAX_BITMAP_NODES 100
1710 #define JBH_HASH_SHIFT 13 /* these are based on journal hash size of 8192 */
1711 #define JBH_HASH_MASK 8191
1713 #define _jhashfn(sb,block) \
1714 (((unsigned long)sb>>L1_CACHE_SHIFT) ^ \
1715 (((block)<<(JBH_HASH_SHIFT - 6)) ^ ((block) >> 13) ^ ((block) << (JBH_HASH_SHIFT - 12))))
1716 #define journal_hash(t,sb,block) ((t)[_jhashfn((sb),(block)) & JBH_HASH_MASK])
1718 // We need these to make journal.c code more readable
1719 #define journal_find_get_block(s, block) __find_get_block(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)
1720 #define journal_getblk(s, block) __getblk(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)
1721 #define journal_bread(s, block) __bread(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)
1723 enum reiserfs_bh_state_bits {
1724 BH_JDirty = BH_PrivateStart, /* buffer is in current transaction */
1726 BH_JNew, /* disk block was taken off free list before
1727 * being in a finished transaction, or
1728 * written to disk. Can be reused immed. */
1731 BH_JTest, // debugging only will go away
1734 BUFFER_FNS(JDirty, journaled);
1735 TAS_BUFFER_FNS(JDirty, journaled);
1736 BUFFER_FNS(JDirty_wait, journal_dirty);
1737 TAS_BUFFER_FNS(JDirty_wait, journal_dirty);
1738 BUFFER_FNS(JNew, journal_new);
1739 TAS_BUFFER_FNS(JNew, journal_new);
1740 BUFFER_FNS(JPrepared, journal_prepared);
1741 TAS_BUFFER_FNS(JPrepared, journal_prepared);
1742 BUFFER_FNS(JRestore_dirty, journal_restore_dirty);
1743 TAS_BUFFER_FNS(JRestore_dirty, journal_restore_dirty);
1744 BUFFER_FNS(JTest, journal_test);
1745 TAS_BUFFER_FNS(JTest, journal_test);
1748 ** transaction handle which is passed around for all journal calls
1750 struct reiserfs_transaction_handle {
1751 struct super_block *t_super ; /* super for this FS when journal_begin was
1752 called. saves calls to reiserfs_get_super
1753 also used by nested transactions to make
1754 sure they are nesting on the right FS
1755 _must_ be first in the handle
1758 int t_blocks_logged ; /* number of blocks this writer has logged */
1759 int t_blocks_allocated ; /* number of blocks this writer allocated */
1760 unsigned long t_trans_id ; /* sanity check, equals the current trans id */
1761 void *t_handle_save ; /* save existing current->journal_info */
1762 unsigned displace_new_blocks:1; /* if new block allocation occurres, that block
1763 should be displaced from others */
1764 struct list_head t_list;
1767 /* used to keep track of ordered and tail writes, attached to the buffer
1768 * head through b_journal_head.
1770 struct reiserfs_jh {
1771 struct reiserfs_journal_list *jl;
1772 struct buffer_head *bh;
1773 struct list_head list;
1776 void reiserfs_free_jh(struct buffer_head *bh);
1777 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh);
1778 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh);
1779 int journal_mark_dirty(struct reiserfs_transaction_handle *, struct super_block *, struct buffer_head *bh) ;
1782 reiserfs_file_data_log(struct inode *inode) {
1783 if (reiserfs_data_log(inode->i_sb) ||
1784 (REISERFS_I(inode)->i_flags & i_data_log))
1789 static inline int reiserfs_transaction_running(struct super_block *s) {
1790 struct reiserfs_transaction_handle *th = current->journal_info ;
1791 if (th && th->t_super == s)
1793 if (th && th->t_super == NULL)
1798 int reiserfs_async_progress_wait(struct super_block *s);
1800 struct reiserfs_transaction_handle *
1801 reiserfs_persistent_transaction(struct super_block *, int count);
1802 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *);
1803 int reiserfs_commit_page(struct inode *inode, struct page *page,
1804 unsigned from, unsigned to);
1805 int reiserfs_flush_old_commits(struct super_block *);
1806 int reiserfs_commit_for_inode(struct inode *) ;
1807 int reiserfs_inode_needs_commit(struct inode *) ;
1808 void reiserfs_update_inode_transaction(struct inode *) ;
1809 void reiserfs_wait_on_write_block(struct super_block *s) ;
1810 void reiserfs_block_writes(struct reiserfs_transaction_handle *th) ;
1811 void reiserfs_allow_writes(struct super_block *s) ;
1812 void reiserfs_check_lock_depth(struct super_block *s, char *caller) ;
1813 int reiserfs_prepare_for_journal(struct super_block *, struct buffer_head *bh, int wait) ;
1814 void reiserfs_restore_prepared_buffer(struct super_block *, struct buffer_head *bh) ;
1815 int journal_init(struct super_block *, const char * j_dev_name, int old_format, unsigned int) ;
1816 int journal_release(struct reiserfs_transaction_handle*, struct super_block *) ;
1817 int journal_release_error(struct reiserfs_transaction_handle*, struct super_block *) ;
1818 int journal_end(struct reiserfs_transaction_handle *, struct super_block *, unsigned long) ;
1819 int journal_end_sync(struct reiserfs_transaction_handle *, struct super_block *, unsigned long) ;
1820 int journal_mark_freed(struct reiserfs_transaction_handle *, struct super_block *, b_blocknr_t blocknr) ;
1821 int journal_transaction_should_end(struct reiserfs_transaction_handle *, int) ;
1822 int reiserfs_in_journal(struct super_block *p_s_sb, int bmap_nr, int bit_nr, int searchall, b_blocknr_t *next) ;
1823 int journal_begin(struct reiserfs_transaction_handle *, struct super_block *p_s_sb, unsigned long) ;
1824 int journal_join_abort(struct reiserfs_transaction_handle *, struct super_block *p_s_sb, unsigned long) ;
1825 void reiserfs_journal_abort (struct super_block *sb, int errno);
1826 void reiserfs_abort (struct super_block *sb, int errno, const char *fmt, ...);
1827 int reiserfs_allocate_list_bitmaps(struct super_block *s, struct reiserfs_list_bitmap *, int) ;
1829 void add_save_link (struct reiserfs_transaction_handle * th,
1830 struct inode * inode, int truncate);
1831 int remove_save_link (struct inode * inode, int truncate);
1834 __u32 reiserfs_get_unused_objectid (struct reiserfs_transaction_handle *th);
1835 void reiserfs_release_objectid (struct reiserfs_transaction_handle *th, __u32 objectid_to_release);
1836 int reiserfs_convert_objectid_map_v1(struct super_block *) ;
1839 int B_IS_IN_TREE(const struct buffer_head *);
1840 extern void copy_item_head(struct item_head * p_v_to,
1841 const struct item_head * p_v_from);
1843 // first key is in cpu form, second - le
1844 extern int comp_short_keys (const struct reiserfs_key * le_key,
1845 const struct cpu_key * cpu_key);
1846 extern void le_key2cpu_key (struct cpu_key * to, const struct reiserfs_key * from);
1848 // both are in le form
1849 extern int comp_le_keys (const struct reiserfs_key *, const struct reiserfs_key *);
1850 extern int comp_short_le_keys (const struct reiserfs_key *, const struct reiserfs_key *);
1853 // get key version from on disk key - kludge
1855 static inline int le_key_version (const struct reiserfs_key * key)
1859 type = offset_v2_k_type( &(key->u.k_offset_v2));
1860 if (type != TYPE_DIRECT && type != TYPE_INDIRECT && type != TYPE_DIRENTRY)
1861 return KEY_FORMAT_3_5;
1863 return KEY_FORMAT_3_6;
1868 static inline void copy_key (struct reiserfs_key *to, const struct reiserfs_key *from)
1870 memcpy (to, from, KEY_SIZE);
1874 int comp_items (const struct item_head * stored_ih, const struct path * p_s_path);
1875 const struct reiserfs_key * get_rkey (const struct path * p_s_chk_path,
1876 const struct super_block * p_s_sb);
1877 int search_by_key (struct super_block *, const struct cpu_key *,
1878 struct path *, int);
1879 #define search_item(s,key,path) search_by_key (s, key, path, DISK_LEAF_NODE_LEVEL)
1880 int search_for_position_by_key (struct super_block * p_s_sb,
1881 const struct cpu_key * p_s_cpu_key,
1882 struct path * p_s_search_path);
1883 extern void decrement_bcount (struct buffer_head * p_s_bh);
1884 void decrement_counters_in_path (struct path * p_s_search_path);
1885 void pathrelse (struct path * p_s_search_path);
1886 int reiserfs_check_path(struct path *p) ;
1887 void pathrelse_and_restore (struct super_block *s, struct path * p_s_search_path);
1889 int reiserfs_insert_item (struct reiserfs_transaction_handle *th,
1891 const struct cpu_key * key,
1892 struct item_head * ih,
1893 struct inode *inode, const char * body);
1895 int reiserfs_paste_into_item (struct reiserfs_transaction_handle *th,
1897 const struct cpu_key * key,
1898 struct inode *inode,
1899 const char * body, int paste_size);
1901 int reiserfs_cut_from_item (struct reiserfs_transaction_handle *th,
1903 struct cpu_key * key,
1904 struct inode * inode,
1906 loff_t new_file_size);
1908 int reiserfs_delete_item (struct reiserfs_transaction_handle *th,
1910 const struct cpu_key * key,
1911 struct inode * inode,
1912 struct buffer_head * p_s_un_bh);
1914 void reiserfs_delete_solid_item (struct reiserfs_transaction_handle *th,
1915 struct inode *inode, struct reiserfs_key * key);
1916 int reiserfs_delete_object (struct reiserfs_transaction_handle *th, struct inode * p_s_inode);
1917 int reiserfs_do_truncate (struct reiserfs_transaction_handle *th,
1918 struct inode * p_s_inode, struct page *,
1919 int update_timestamps);
1921 #define i_block_size(inode) ((inode)->i_sb->s_blocksize)
1922 #define file_size(inode) ((inode)->i_size)
1923 #define tail_size(inode) (file_size (inode) & (i_block_size (inode) - 1))
1925 #define tail_has_to_be_packed(inode) (have_large_tails ((inode)->i_sb)?\
1926 !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 )
1928 void padd_item (char * item, int total_length, int length);
1931 /* args for the create parameter of reiserfs_get_block */
1932 #define GET_BLOCK_NO_CREATE 0 /* don't create new blocks or convert tails */
1933 #define GET_BLOCK_CREATE 1 /* add anything you need to find block */
1934 #define GET_BLOCK_NO_HOLE 2 /* return -ENOENT for file holes */
1935 #define GET_BLOCK_READ_DIRECT 4 /* read the tail if indirect item not found */
1936 #define GET_BLOCK_NO_ISEM 8 /* i_sem is not held, don't preallocate */
1937 #define GET_BLOCK_NO_DANGLE 16 /* don't leave any transactions running */
1939 int restart_transaction(struct reiserfs_transaction_handle *th, struct inode *inode, struct path *path);
1940 void reiserfs_read_locked_inode(struct inode * inode, struct reiserfs_iget_args *args) ;
1941 int reiserfs_find_actor(struct inode * inode, void *p) ;
1942 int reiserfs_init_locked_inode(struct inode * inode, void *p) ;
1943 void reiserfs_delete_inode (struct inode * inode);
1944 int reiserfs_write_inode (struct inode * inode, int) ;
1945 int reiserfs_get_block (struct inode * inode, sector_t block, struct buffer_head * bh_result, int create);
1946 struct dentry *reiserfs_get_dentry(struct super_block *, void *) ;
1947 struct dentry *reiserfs_decode_fh(struct super_block *sb, __u32 *data,
1948 int len, int fhtype,
1949 int (*acceptable)(void *contect, struct dentry *de),
1951 int reiserfs_encode_fh( struct dentry *dentry, __u32 *data, int *lenp,
1954 int reiserfs_truncate_file(struct inode *, int update_timestamps) ;
1955 void make_cpu_key (struct cpu_key * cpu_key, struct inode * inode, loff_t offset,
1956 int type, int key_length);
1957 void make_le_item_head (struct item_head * ih, const struct cpu_key * key,
1959 loff_t offset, int type, int length, int entry_count);
1960 struct inode * reiserfs_iget (struct super_block * s,
1961 const struct cpu_key * key);
1964 int reiserfs_new_inode (struct reiserfs_transaction_handle *th,
1965 struct inode * dir, int mode,
1966 const char * symname, loff_t i_size,
1967 struct dentry *dentry, struct inode *inode);
1969 void reiserfs_update_sd_size (struct reiserfs_transaction_handle *th,
1970 struct inode * inode, loff_t size);
1972 static inline void reiserfs_update_sd(struct reiserfs_transaction_handle *th,
1973 struct inode *inode)
1975 reiserfs_update_sd_size(th, inode, inode->i_size) ;
1978 void sd_attrs_to_i_attrs( __u16 sd_attrs, struct inode *inode );
1979 void i_attrs_to_sd_attrs( struct inode *inode, __u16 *sd_attrs );
1980 int reiserfs_setattr(struct dentry *dentry, struct iattr *attr);
1983 void set_de_name_and_namelen (struct reiserfs_dir_entry * de);
1984 int search_by_entry_key (struct super_block * sb, const struct cpu_key * key,
1986 struct reiserfs_dir_entry * de);
1987 struct dentry *reiserfs_get_parent(struct dentry *) ;
1990 #if defined( CONFIG_PROC_FS ) && defined( CONFIG_REISERFS_PROC_INFO )
1991 #define REISERFS_PROC_INFO
1993 #undef REISERFS_PROC_INFO
1996 int reiserfs_proc_info_init( struct super_block *sb );
1997 int reiserfs_proc_info_done( struct super_block *sb );
1998 struct proc_dir_entry *reiserfs_proc_register_global( char *name,
1999 read_proc_t *func );
2000 void reiserfs_proc_unregister_global( const char *name );
2001 int reiserfs_proc_info_global_init( void );
2002 int reiserfs_proc_info_global_done( void );
2003 int reiserfs_global_version_in_proc( char *buffer, char **start, off_t offset,
2004 int count, int *eof, void *data );
2006 #if defined( REISERFS_PROC_INFO )
2008 #define PROC_EXP( e ) e
2010 #define __PINFO( sb ) REISERFS_SB(sb) -> s_proc_info_data
2011 #define PROC_INFO_MAX( sb, field, value ) \
2012 __PINFO( sb ).field = \
2013 max( REISERFS_SB( sb ) -> s_proc_info_data.field, value )
2014 #define PROC_INFO_INC( sb, field ) ( ++ ( __PINFO( sb ).field ) )
2015 #define PROC_INFO_ADD( sb, field, val ) ( __PINFO( sb ).field += ( val ) )
2016 #define PROC_INFO_BH_STAT( sb, bh, level ) \
2017 PROC_INFO_INC( sb, sbk_read_at[ ( level ) ] ); \
2018 PROC_INFO_ADD( sb, free_at[ ( level ) ], B_FREE_SPACE( bh ) ); \
2019 PROC_INFO_ADD( sb, items_at[ ( level ) ], B_NR_ITEMS( bh ) )
2021 #define PROC_EXP( e )
2022 #define VOID_V ( ( void ) 0 )
2023 #define PROC_INFO_MAX( sb, field, value ) VOID_V
2024 #define PROC_INFO_INC( sb, field ) VOID_V
2025 #define PROC_INFO_ADD( sb, field, val ) VOID_V
2026 #define PROC_INFO_BH_STAT( p_s_sb, p_s_bh, n_node_level ) VOID_V
2030 extern struct inode_operations reiserfs_dir_inode_operations;
2031 extern struct inode_operations reiserfs_symlink_inode_operations;
2032 extern struct inode_operations reiserfs_special_inode_operations;
2033 extern struct file_operations reiserfs_dir_operations;
2035 /* tail_conversion.c */
2036 int direct2indirect (struct reiserfs_transaction_handle *, struct inode *, struct path *, struct buffer_head *, loff_t);
2037 int indirect2direct (struct reiserfs_transaction_handle *, struct inode *, struct page *, struct path *, const struct cpu_key *, loff_t, char *);
2038 void reiserfs_unmap_buffer(struct buffer_head *) ;
2042 extern struct inode_operations reiserfs_file_inode_operations;
2043 extern struct file_operations reiserfs_file_operations;
2044 extern struct address_space_operations reiserfs_address_space_operations ;
2047 #ifdef CONFIG_REISERFS_CHECK
2048 void * reiserfs_kmalloc (size_t size, int flags, struct super_block * s);
2049 void reiserfs_kfree (const void * vp, size_t size, struct super_block * s);
2051 static inline void *reiserfs_kmalloc(size_t size, int flags,
2052 struct super_block *s)
2054 return kmalloc(size, flags);
2057 static inline void reiserfs_kfree(const void *vp, size_t size,
2058 struct super_block *s)
2064 int fix_nodes (int n_op_mode, struct tree_balance * p_s_tb,
2065 struct item_head * p_s_ins_ih, const void *);
2066 void unfix_nodes (struct tree_balance *);
2070 void reiserfs_panic (struct super_block * s, const char * fmt, ...) __attribute__ ( ( noreturn ) );
2071 void reiserfs_info (struct super_block *s, const char * fmt, ...);
2072 void reiserfs_debug (struct super_block *s, int level, const char * fmt, ...);
2073 void print_indirect_item (struct buffer_head * bh, int item_num);
2074 void store_print_tb (struct tree_balance * tb);
2075 void print_cur_tb (char * mes);
2076 void print_de (struct reiserfs_dir_entry * de);
2077 void print_bi (struct buffer_info * bi, char * mes);
2078 #define PRINT_LEAF_ITEMS 1 /* print all items */
2079 #define PRINT_DIRECTORY_ITEMS 2 /* print directory items */
2080 #define PRINT_DIRECT_ITEMS 4 /* print contents of direct items */
2081 void print_block (struct buffer_head * bh, ...);
2082 void print_bmap (struct super_block * s, int silent);
2083 void print_bmap_block (int i, char * data, int size, int silent);
2084 /*void print_super_block (struct super_block * s, char * mes);*/
2085 void print_objectid_map (struct super_block * s);
2086 void print_block_head (struct buffer_head * bh, char * mes);
2087 void check_leaf (struct buffer_head * bh);
2088 void check_internal (struct buffer_head * bh);
2089 void print_statistics (struct super_block * s);
2090 char * reiserfs_hashname(int code);
2093 int leaf_move_items (int shift_mode, struct tree_balance * tb, int mov_num, int mov_bytes, struct buffer_head * Snew);
2094 int leaf_shift_left (struct tree_balance * tb, int shift_num, int shift_bytes);
2095 int leaf_shift_right (struct tree_balance * tb, int shift_num, int shift_bytes);
2096 void leaf_delete_items (struct buffer_info * cur_bi, int last_first, int first, int del_num, int del_bytes);
2097 void leaf_insert_into_buf (struct buffer_info * bi, int before,
2098 struct item_head * inserted_item_ih, const char * inserted_item_body, int zeros_number);
2099 void leaf_paste_in_buffer (struct buffer_info * bi, int pasted_item_num,
2100 int pos_in_item, int paste_size, const char * body, int zeros_number);
2101 void leaf_cut_from_buffer (struct buffer_info * bi, int cut_item_num, int pos_in_item,
2103 void leaf_paste_entries (struct buffer_head * bh, int item_num, int before,
2104 int new_entry_count, struct reiserfs_de_head * new_dehs, const char * records, int paste_size);
2106 int balance_internal (struct tree_balance * , int, int, struct item_head * ,
2107 struct buffer_head **);
2110 void do_balance_mark_leaf_dirty (struct tree_balance * tb,
2111 struct buffer_head * bh, int flag);
2112 #define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty
2113 #define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty
2115 void do_balance (struct tree_balance * tb, struct item_head * ih,
2116 const char * body, int flag);
2117 void reiserfs_invalidate_buffer (struct tree_balance * tb, struct buffer_head * bh);
2119 int get_left_neighbor_position (struct tree_balance * tb, int h);
2120 int get_right_neighbor_position (struct tree_balance * tb, int h);
2121 void replace_key (struct tree_balance * tb, struct buffer_head *, int, struct buffer_head *, int);
2122 void make_empty_node (struct buffer_info *);
2123 struct buffer_head * get_FEB (struct tree_balance *);
2127 /* structure contains hints for block allocator, and it is a container for
2128 * arguments, such as node, search path, transaction_handle, etc. */
2129 struct __reiserfs_blocknr_hint {
2130 struct inode * inode; /* inode passed to allocator, if we allocate unf. nodes */
2131 long block; /* file offset, in blocks */
2132 struct reiserfs_key key;
2133 struct path * path; /* search path, used by allocator to deternine search_start by
2135 struct reiserfs_transaction_handle * th; /* transaction handle is needed to log super blocks and
2136 * bitmap blocks changes */
2137 b_blocknr_t beg, end;
2138 b_blocknr_t search_start; /* a field used to transfer search start value (block number)
2139 * between different block allocator procedures
2140 * (determine_search_start() and others) */
2141 int prealloc_size; /* is set in determine_prealloc_size() function, used by underlayed
2142 * function that do actual allocation */
2144 unsigned formatted_node:1; /* the allocator uses different polices for getting disk space for
2145 * formatted/unformatted blocks with/without preallocation */
2146 unsigned preallocate:1;
2149 typedef struct __reiserfs_blocknr_hint reiserfs_blocknr_hint_t;
2151 int reiserfs_parse_alloc_options (struct super_block *, char *);
2152 void reiserfs_init_alloc_options (struct super_block *s);
2155 * given a directory, this will tell you what packing locality
2156 * to use for a new object underneat it. The locality is returned
2157 * in disk byte order (le).
2159 u32 reiserfs_choose_packing(struct inode *dir);
2161 int is_reusable (struct super_block * s, b_blocknr_t block, int bit_value);
2162 void reiserfs_free_block (struct reiserfs_transaction_handle *th, struct inode *, b_blocknr_t, int for_unformatted);
2163 int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t *, b_blocknr_t * , int, int);
2164 extern inline int reiserfs_new_form_blocknrs (struct tree_balance * tb,
2165 b_blocknr_t *new_blocknrs, int amount_needed)
2167 reiserfs_blocknr_hint_t hint = {
2168 .th = tb->transaction_handle,
2169 .path = tb->tb_path,
2175 return reiserfs_allocate_blocknrs(&hint, new_blocknrs, amount_needed, 0);
2178 extern inline int reiserfs_new_unf_blocknrs (struct reiserfs_transaction_handle *th,
2179 struct inode *inode,
2180 b_blocknr_t *new_blocknrs,
2181 struct path * path, long block)
2183 reiserfs_blocknr_hint_t hint = {
2188 .formatted_node = 0,
2191 return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0);
2194 #ifdef REISERFS_PREALLOCATE
2195 extern inline int reiserfs_new_unf_blocknrs2(struct reiserfs_transaction_handle *th,
2196 struct inode * inode,
2197 b_blocknr_t *new_blocknrs,
2198 struct path * path, long block)
2200 reiserfs_blocknr_hint_t hint = {
2205 .formatted_node = 0,
2208 return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0);
2211 void reiserfs_discard_prealloc (struct reiserfs_transaction_handle *th,
2212 struct inode * inode);
2213 void reiserfs_discard_all_prealloc (struct reiserfs_transaction_handle *th);
2215 void reiserfs_claim_blocks_to_be_allocated( struct super_block *sb, int blocks);
2216 void reiserfs_release_claimed_blocks( struct super_block *sb, int blocks);
2217 int reiserfs_can_fit_pages(struct super_block *sb);
2220 __u32 keyed_hash (const signed char *msg, int len);
2221 __u32 yura_hash (const signed char *msg, int len);
2222 __u32 r5_hash (const signed char *msg, int len);
2224 /* the ext2 bit routines adjust for big or little endian as
2225 ** appropriate for the arch, so in our laziness we use them rather
2226 ** than using the bit routines they call more directly. These
2227 ** routines must be used when changing on disk bitmaps. */
2228 #define reiserfs_test_and_set_le_bit ext2_set_bit
2229 #define reiserfs_test_and_clear_le_bit ext2_clear_bit
2230 #define reiserfs_test_le_bit ext2_test_bit
2231 #define reiserfs_find_next_zero_le_bit ext2_find_next_zero_bit
2233 /* sometimes reiserfs_truncate may require to allocate few new blocks
2234 to perform indirect2direct conversion. People probably used to
2235 think, that truncate should work without problems on a filesystem
2236 without free disk space. They may complain that they can not
2237 truncate due to lack of free disk space. This spare space allows us
2238 to not worry about it. 500 is probably too much, but it should be
2240 #define SPARE_SPACE 500
2243 /* prototypes from ioctl.c */
2244 int reiserfs_ioctl (struct inode * inode, struct file * filp,
2245 unsigned int cmd, unsigned long arg);
2247 /* ioctl's command */
2248 #define REISERFS_IOC_UNPACK _IOW(0xCD,1,long)
2249 /* define following flags to be the same as in ext2, so that chattr(1),
2250 lsattr(1) will work with us. */
2251 #define REISERFS_IOC_GETFLAGS EXT2_IOC_GETFLAGS
2252 #define REISERFS_IOC_SETFLAGS EXT2_IOC_SETFLAGS
2253 #define REISERFS_IOC_GETVERSION EXT2_IOC_GETVERSION
2254 #define REISERFS_IOC_SETVERSION EXT2_IOC_SETVERSION
2256 /* Locking primitives */
2257 /* Right now we are still falling back to (un)lock_kernel, but eventually that
2258 would evolve into real per-fs locks */
2259 #define reiserfs_write_lock( sb ) lock_kernel()
2260 #define reiserfs_write_unlock( sb ) unlock_kernel()
2263 #define REISERFS_XATTR_DIR_SEM(s) (REISERFS_SB(s)->xattr_dir_sem)
2265 #endif /* _LINUX_REISER_FS_H */