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diff --git a/fs/logfs/logfs.h b/fs/logfs/logfs.h
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1/*
2 * fs/logfs/logfs.h
3 *
4 * As should be obvious for Linux kernel code, license is GPLv2
5 *
6 * Copyright (c) 2005-2008 Joern Engel <joern@logfs.org>
7 *
8 * Private header for logfs.
9 */
10#ifndef FS_LOGFS_LOGFS_H
11#define FS_LOGFS_LOGFS_H
12
13#undef __CHECK_ENDIAN__
14#define __CHECK_ENDIAN__
15
16#include <linux/btree.h>
17#include <linux/crc32.h>
18#include <linux/fs.h>
19#include <linux/kernel.h>
20#include <linux/mempool.h>
21#include <linux/pagemap.h>
22#include <linux/mtd/mtd.h>
23#include "logfs_abi.h"
24
25#define LOGFS_DEBUG_SUPER (0x0001)
26#define LOGFS_DEBUG_SEGMENT (0x0002)
27#define LOGFS_DEBUG_JOURNAL (0x0004)
28#define LOGFS_DEBUG_DIR (0x0008)
29#define LOGFS_DEBUG_FILE (0x0010)
30#define LOGFS_DEBUG_INODE (0x0020)
31#define LOGFS_DEBUG_READWRITE (0x0040)
32#define LOGFS_DEBUG_GC (0x0080)
33#define LOGFS_DEBUG_GC_NOISY (0x0100)
34#define LOGFS_DEBUG_ALIASES (0x0200)
35#define LOGFS_DEBUG_BLOCKMOVE (0x0400)
36#define LOGFS_DEBUG_ALL (0xffffffff)
37
38#define LOGFS_DEBUG (0x01)
39/*
40 * To enable specific log messages, simply define LOGFS_DEBUG to match any
41 * or all of the above.
42 */
43#ifndef LOGFS_DEBUG
44#define LOGFS_DEBUG (0)
45#endif
46
47#define log_cond(cond, fmt, arg...) do { \
48 if (cond) \
49 printk(KERN_DEBUG fmt, ##arg); \
50} while (0)
51
52#define log_super(fmt, arg...) \
53 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_SUPER, fmt, ##arg)
54#define log_segment(fmt, arg...) \
55 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_SEGMENT, fmt, ##arg)
56#define log_journal(fmt, arg...) \
57 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_JOURNAL, fmt, ##arg)
58#define log_dir(fmt, arg...) \
59 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_DIR, fmt, ##arg)
60#define log_file(fmt, arg...) \
61 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_FILE, fmt, ##arg)
62#define log_inode(fmt, arg...) \
63 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_INODE, fmt, ##arg)
64#define log_readwrite(fmt, arg...) \
65 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_READWRITE, fmt, ##arg)
66#define log_gc(fmt, arg...) \
67 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_GC, fmt, ##arg)
68#define log_gc_noisy(fmt, arg...) \
69 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_GC_NOISY, fmt, ##arg)
70#define log_aliases(fmt, arg...) \
71 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_ALIASES, fmt, ##arg)
72#define log_blockmove(fmt, arg...) \
73 log_cond(LOGFS_DEBUG & LOGFS_DEBUG_BLOCKMOVE, fmt, ##arg)
74
75#define PG_pre_locked PG_owner_priv_1
76#define PagePreLocked(page) test_bit(PG_pre_locked, &(page)->flags)
77#define SetPagePreLocked(page) set_bit(PG_pre_locked, &(page)->flags)
78#define ClearPagePreLocked(page) clear_bit(PG_pre_locked, &(page)->flags)
79
80/* FIXME: This should really be somewhere in the 64bit area. */
81#define LOGFS_LINK_MAX (1<<30)
82
83/* Read-only filesystem */
84#define LOGFS_SB_FLAG_RO 0x0001
85#define LOGFS_SB_FLAG_SEG_ALIAS 0x0002
86#define LOGFS_SB_FLAG_OBJ_ALIAS 0x0004
87#define LOGFS_SB_FLAG_SHUTDOWN 0x0008
88
89/* Write Control Flags */
90#define WF_LOCK 0x01 /* take write lock */
91#define WF_WRITE 0x02 /* write block */
92#define WF_DELETE 0x04 /* delete old block */
93
94typedef u8 __bitwise level_t;
95typedef u8 __bitwise gc_level_t;
96
97#define LEVEL(level) ((__force level_t)(level))
98#define GC_LEVEL(gc_level) ((__force gc_level_t)(gc_level))
99
100#define SUBLEVEL(level) ( (void)((level) == LEVEL(1)), \
101 (__force level_t)((__force u8)(level) - 1) )
102
103/**
104 * struct logfs_area - area management information
105 *
106 * @a_sb: the superblock this area belongs to
107 * @a_is_open: 1 if the area is currently open, else 0
108 * @a_segno: segment number of area
109 * @a_written_bytes: number of bytes already written back
110 * @a_used_bytes: number of used bytes
111 * @a_ops: area operations (either journal or ostore)
112 * @a_erase_count: erase count
113 * @a_level: GC level
114 */
115struct logfs_area { /* a segment open for writing */
116 struct super_block *a_sb;
117 int a_is_open;
118 u32 a_segno;
119 u32 a_written_bytes;
120 u32 a_used_bytes;
121 const struct logfs_area_ops *a_ops;
122 u32 a_erase_count;
123 gc_level_t a_level;
124};
125
126/**
127 * struct logfs_area_ops - area operations
128 *
129 * @get_free_segment: fill area->ofs with the offset of a free segment
130 * @get_erase_count: fill area->erase_count (needs area->ofs)
131 * @erase_segment: erase and setup segment
132 */
133struct logfs_area_ops {
134 void (*get_free_segment)(struct logfs_area *area);
135 void (*get_erase_count)(struct logfs_area *area);
136 int (*erase_segment)(struct logfs_area *area);
137};
138
139/**
140 * struct logfs_device_ops - device access operations
141 *
142 * @readpage: read one page (mm page)
143 * @writeseg: write one segment. may be a partial segment
144 * @erase: erase one segment
145 * @read: read from the device
146 * @erase: erase part of the device
147 */
148struct logfs_device_ops {
149 struct page *(*find_first_sb)(struct super_block *sb, u64 *ofs);
150 struct page *(*find_last_sb)(struct super_block *sb, u64 *ofs);
151 int (*write_sb)(struct super_block *sb, struct page *page);
152 int (*readpage)(void *_sb, struct page *page);
153 void (*writeseg)(struct super_block *sb, u64 ofs, size_t len);
154 int (*erase)(struct super_block *sb, loff_t ofs, size_t len);
155 void (*sync)(struct super_block *sb);
156 void (*put_device)(struct super_block *sb);
157};
158
159/**
160 * struct candidate_list - list of similar candidates
161 */
162struct candidate_list {
163 struct rb_root rb_tree;
164 int count;
165 int maxcount;
166 int sort_by_ec;
167};
168
169/**
170 * struct gc_candidate - "candidate" segment to be garbage collected next
171 *
172 * @list: list (either free of low)
173 * @segno: segment number
174 * @valid: number of valid bytes
175 * @erase_count: erase count of segment
176 * @dist: distance from tree root
177 *
178 * Candidates can be on two lists. The free list contains electees rather
179 * than candidates - segments that no longer contain any valid data. The
180 * low list contains candidates to be picked for GC. It should be kept
181 * short. It is not required to always pick a perfect candidate. In the
182 * worst case GC will have to move more data than absolutely necessary.
183 */
184struct gc_candidate {
185 struct rb_node rb_node;
186 struct candidate_list *list;
187 u32 segno;
188 u32 valid;
189 u32 erase_count;
190 u8 dist;
191};
192
193/**
194 * struct logfs_journal_entry - temporary structure used during journal scan
195 *
196 * @used:
197 * @version: normalized version
198 * @len: length
199 * @offset: offset
200 */
201struct logfs_journal_entry {
202 int used;
203 s16 version;
204 u16 len;
205 u16 datalen;
206 u64 offset;
207};
208
209enum transaction_state {
210 CREATE_1 = 1,
211 CREATE_2,
212 UNLINK_1,
213 UNLINK_2,
214 CROSS_RENAME_1,
215 CROSS_RENAME_2,
216 TARGET_RENAME_1,
217 TARGET_RENAME_2,
218 TARGET_RENAME_3
219};
220
221/**
222 * struct logfs_transaction - essential fields to support atomic dirops
223 *
224 * @ino: target inode
225 * @dir: inode of directory containing dentry
226 * @pos: pos of dentry in directory
227 */
228struct logfs_transaction {
229 enum transaction_state state;
230 u64 ino;
231 u64 dir;
232 u64 pos;
233};
234
235/**
236 * struct logfs_shadow - old block in the shadow of a not-yet-committed new one
237 * @old_ofs: offset of old block on medium
238 * @new_ofs: offset of new block on medium
239 * @ino: inode number
240 * @bix: block index
241 * @old_len: size of old block, including header
242 * @new_len: size of new block, including header
243 * @level: block level
244 */
245struct logfs_shadow {
246 u64 old_ofs;
247 u64 new_ofs;
248 u64 ino;
249 u64 bix;
250 int old_len;
251 int new_len;
252 gc_level_t gc_level;
253};
254
255/**
256 * struct shadow_tree
257 * @new: shadows where old_ofs==0, indexed by new_ofs
258 * @old: shadows where old_ofs!=0, indexed by old_ofs
259 */
260struct shadow_tree {
261 struct btree_head64 new;
262 struct btree_head64 old;
263};
264
265struct object_alias_item {
266 struct list_head list;
267 __be64 val;
268 int child_no;
269};
270
271/**
272 * struct logfs_block - contains any block state
273 * @type: indirect block or inode
274 * @full: number of fully populated children
275 * @partial: number of partially populated children
276 *
277 * Most blocks are directly represented by page cache pages. But when a block
278 * becomes dirty, is part of a transaction, contains aliases or is otherwise
279 * special, a struct logfs_block is allocated to track the additional state.
280 * Inodes are very similar to indirect blocks, so they can also get one of
281 * these structures added when appropriate.
282 */
283#define BLOCK_INDIRECT 1 /* Indirect block */
284#define BLOCK_INODE 2 /* Inode */
285struct logfs_block_ops;
286struct logfs_block {
287 struct list_head alias_list;
288 struct list_head item_list;
289 struct super_block *sb;
290 u64 ino;
291 u64 bix;
292 level_t level;
293 struct page *page;
294 struct inode *inode;
295 struct logfs_transaction *ta;
296 unsigned long alias_map[LOGFS_BLOCK_FACTOR / BITS_PER_LONG];
297 struct logfs_block_ops *ops;
298 int full;
299 int partial;
300 int reserved_bytes;
301};
302
303typedef int write_alias_t(struct super_block *sb, u64 ino, u64 bix,
304 level_t level, int child_no, __be64 val);
305struct logfs_block_ops {
306 void (*write_block)(struct logfs_block *block);
307 gc_level_t (*block_level)(struct logfs_block *block);
308 void (*free_block)(struct super_block *sb, struct logfs_block*block);
309 int (*write_alias)(struct super_block *sb,
310 struct logfs_block *block,
311 write_alias_t *write_one_alias);
312};
313
314struct logfs_super {
315 struct mtd_info *s_mtd; /* underlying device */
316 struct block_device *s_bdev; /* underlying device */
317 const struct logfs_device_ops *s_devops;/* device access */
318 struct inode *s_master_inode; /* inode file */
319 struct inode *s_segfile_inode; /* segment file */
320 struct inode *s_mapping_inode; /* device mapping */
321 atomic_t s_pending_writes; /* outstanting bios */
322 long s_flags;
323 mempool_t *s_btree_pool; /* for btree nodes */
324 mempool_t *s_alias_pool; /* aliases in segment.c */
325 u64 s_feature_incompat;
326 u64 s_feature_ro_compat;
327 u64 s_feature_compat;
328 u64 s_feature_flags;
329 u64 s_sb_ofs[2];
330 /* alias.c fields */
331 struct btree_head32 s_segment_alias; /* remapped segments */
332 int s_no_object_aliases;
333 struct list_head s_object_alias; /* remapped objects */
334 struct btree_head128 s_object_alias_tree; /* remapped objects */
335 struct mutex s_object_alias_mutex;
336 /* dir.c fields */
337 struct mutex s_dirop_mutex; /* for creat/unlink/rename */
338 u64 s_victim_ino; /* used for atomic dir-ops */
339 u64 s_rename_dir; /* source directory ino */
340 u64 s_rename_pos; /* position of source dd */
341 /* gc.c fields */
342 long s_segsize; /* size of a segment */
343 int s_segshift; /* log2 of segment size */
344 long s_segmask; /* 1 << s_segshift - 1 */
345 long s_no_segs; /* segments on device */
346 long s_no_journal_segs; /* segments used for journal */
347 long s_no_blocks; /* blocks per segment */
348 long s_writesize; /* minimum write size */
349 int s_writeshift; /* log2 of write size */
350 u64 s_size; /* filesystem size */
351 struct logfs_area *s_area[LOGFS_NO_AREAS]; /* open segment array */
352 u64 s_gec; /* global erase count */
353 u64 s_wl_gec_ostore; /* time of last wl event */
354 u64 s_wl_gec_journal; /* time of last wl event */
355 u64 s_sweeper; /* current sweeper pos */
356 u8 s_ifile_levels; /* max level of ifile */
357 u8 s_iblock_levels; /* max level of regular files */
358 u8 s_data_levels; /* # of segments to leaf block*/
359 u8 s_total_levels; /* sum of above three */
360 struct btree_head32 s_cand_tree; /* all candidates */
361 struct candidate_list s_free_list; /* 100% free segments */
362 struct candidate_list s_reserve_list; /* Bad segment reserve */
363 struct candidate_list s_low_list[LOGFS_NO_AREAS];/* good candidates */
364 struct candidate_list s_ec_list; /* wear level candidates */
365 struct btree_head32 s_reserved_segments;/* sb, journal, bad, etc. */
366 /* inode.c fields */
367 u64 s_last_ino; /* highest ino used */
368 long s_inos_till_wrap;
369 u32 s_generation; /* i_generation for new files */
370 struct list_head s_freeing_list; /* inodes being freed */
371 /* journal.c fields */
372 struct mutex s_journal_mutex;
373 void *s_je; /* journal entry to compress */
374 void *s_compressed_je; /* block to write to journal */
375 u32 s_journal_seg[LOGFS_JOURNAL_SEGS]; /* journal segments */
376 u32 s_journal_ec[LOGFS_JOURNAL_SEGS]; /* journal erasecounts */
377 u64 s_last_version;
378 struct logfs_area *s_journal_area; /* open journal segment */
379 __be64 s_je_array[64];
380 int s_no_je;
381
382 int s_sum_index; /* for the 12 summaries */
383 struct shadow_tree s_shadow_tree;
384 int s_je_fill; /* index of current je */
385 /* readwrite.c fields */
386 struct mutex s_write_mutex;
387 int s_lock_count;
388 mempool_t *s_block_pool; /* struct logfs_block pool */
389 mempool_t *s_shadow_pool; /* struct logfs_shadow pool */
390 /*
391 * Space accounting:
392 * - s_used_bytes specifies space used to store valid data objects.
393 * - s_dirty_used_bytes is space used to store non-committed data
394 * objects. Those objects have already been written themselves,
395 * but they don't become valid until all indirect blocks up to the
396 * journal have been written as well.
397 * - s_dirty_free_bytes is space used to store the old copy of a
398 * replaced object, as long as the replacement is non-committed.
399 * In other words, it is the amount of space freed when all dirty
400 * blocks are written back.
401 * - s_free_bytes is the amount of free space available for any
402 * purpose.
403 * - s_root_reserve is the amount of free space available only to
404 * the root user. Non-privileged users can no longer write once
405 * this watermark has been reached.
406 * - s_speed_reserve is space which remains unused to speed up
407 * garbage collection performance.
408 * - s_dirty_pages is the space reserved for currently dirty pages.
409 * It is a pessimistic estimate, so some/most will get freed on
410 * page writeback.
411 *
412 * s_used_bytes + s_free_bytes + s_speed_reserve = total usable size
413 */
414 u64 s_free_bytes;
415 u64 s_used_bytes;
416 u64 s_dirty_free_bytes;
417 u64 s_dirty_used_bytes;
418 u64 s_root_reserve;
419 u64 s_speed_reserve;
420 u64 s_dirty_pages;
421 /* Bad block handling:
422 * - s_bad_seg_reserve is a number of segments usually kept
423 * free. When encountering bad blocks, the affected segment's data
424 * is _temporarily_ moved to a reserved segment.
425 * - s_bad_segments is the number of known bad segments.
426 */
427 u32 s_bad_seg_reserve;
428 u32 s_bad_segments;
429};
430
431/**
432 * struct logfs_inode - in-memory inode
433 *
434 * @vfs_inode: struct inode
435 * @li_data: data pointers
436 * @li_used_bytes: number of used bytes
437 * @li_freeing_list: used to track inodes currently being freed
438 * @li_flags: inode flags
439 * @li_refcount: number of internal (GC-induced) references
440 */
441struct logfs_inode {
442 struct inode vfs_inode;
443 u64 li_data[LOGFS_EMBEDDED_FIELDS];
444 u64 li_used_bytes;
445 struct list_head li_freeing_list;
446 struct logfs_block *li_block;
447 u32 li_flags;
448 u8 li_height;
449 int li_refcount;
450};
451
452#define journal_for_each(__i) for (__i = 0; __i < LOGFS_JOURNAL_SEGS; __i++)
453#define for_each_area(__i) for (__i = 0; __i < LOGFS_NO_AREAS; __i++)
454#define for_each_area_down(__i) for (__i = LOGFS_NO_AREAS - 1; __i >= 0; __i--)
455
456/* compr.c */
457int logfs_compress(void *in, void *out, size_t inlen, size_t outlen);
458int logfs_uncompress(void *in, void *out, size_t inlen, size_t outlen);
459int __init logfs_compr_init(void);
460void logfs_compr_exit(void);
461
462/* dev_bdev.c */
463#ifdef CONFIG_BLOCK
464int logfs_get_sb_bdev(struct file_system_type *type, int flags,
465 const char *devname, struct vfsmount *mnt);
466#else
467static inline int logfs_get_sb_bdev(struct file_system_type *type, int flags,
468 const char *devname, struct vfsmount *mnt)
469{
470 return -ENODEV;
471}
472#endif
473
474/* dev_mtd.c */
475#ifdef CONFIG_MTD
476int logfs_get_sb_mtd(struct file_system_type *type, int flags,
477 int mtdnr, struct vfsmount *mnt);
478#else
479static inline int logfs_get_sb_mtd(struct file_system_type *type, int flags,
480 int mtdnr, struct vfsmount *mnt)
481{
482 return -ENODEV;
483}
484#endif
485
486/* dir.c */
487extern const struct inode_operations logfs_symlink_iops;
488extern const struct inode_operations logfs_dir_iops;
489extern const struct file_operations logfs_dir_fops;
490int logfs_replay_journal(struct super_block *sb);
491
492/* file.c */
493extern const struct inode_operations logfs_reg_iops;
494extern const struct file_operations logfs_reg_fops;
495extern const struct address_space_operations logfs_reg_aops;
496int logfs_readpage(struct file *file, struct page *page);
497int logfs_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
498 unsigned long arg);
499int logfs_fsync(struct file *file, struct dentry *dentry, int datasync);
500
501/* gc.c */
502u32 get_best_cand(struct super_block *sb, struct candidate_list *list, u32 *ec);
503void logfs_gc_pass(struct super_block *sb);
504int logfs_check_areas(struct super_block *sb);
505int logfs_init_gc(struct super_block *sb);
506void logfs_cleanup_gc(struct super_block *sb);
507
508/* inode.c */
509extern const struct super_operations logfs_super_operations;
510struct inode *logfs_iget(struct super_block *sb, ino_t ino);
511struct inode *logfs_safe_iget(struct super_block *sb, ino_t ino, int *cookie);
512void logfs_safe_iput(struct inode *inode, int cookie);
513struct inode *logfs_new_inode(struct inode *dir, int mode);
514struct inode *logfs_new_meta_inode(struct super_block *sb, u64 ino);
515struct inode *logfs_read_meta_inode(struct super_block *sb, u64 ino);
516int logfs_init_inode_cache(void);
517void logfs_destroy_inode_cache(void);
518void destroy_meta_inode(struct inode *inode);
519void logfs_set_blocks(struct inode *inode, u64 no);
520/* these logically belong into inode.c but actually reside in readwrite.c */
521int logfs_read_inode(struct inode *inode);
522int __logfs_write_inode(struct inode *inode, long flags);
523void logfs_delete_inode(struct inode *inode);
524void logfs_clear_inode(struct inode *inode);
525
526/* journal.c */
527void logfs_write_anchor(struct inode *inode);
528int logfs_init_journal(struct super_block *sb);
529void logfs_cleanup_journal(struct super_block *sb);
530int write_alias_journal(struct super_block *sb, u64 ino, u64 bix,
531 level_t level, int child_no, __be64 val);
532void do_logfs_journal_wl_pass(struct super_block *sb);
533
534/* readwrite.c */
535pgoff_t logfs_pack_index(u64 bix, level_t level);
536void logfs_unpack_index(pgoff_t index, u64 *bix, level_t *level);
537int logfs_inode_write(struct inode *inode, const void *buf, size_t count,
538 loff_t bix, long flags, struct shadow_tree *shadow_tree);
539int logfs_readpage_nolock(struct page *page);
540int logfs_write_buf(struct inode *inode, struct page *page, long flags);
541int logfs_delete(struct inode *inode, pgoff_t index,
542 struct shadow_tree *shadow_tree);
543int logfs_rewrite_block(struct inode *inode, u64 bix, u64 ofs,
544 gc_level_t gc_level, long flags);
545int logfs_is_valid_block(struct super_block *sb, u64 ofs, u64 ino, u64 bix,
546 gc_level_t gc_level);
547int logfs_truncate(struct inode *inode, u64 size);
548u64 logfs_seek_hole(struct inode *inode, u64 bix);
549u64 logfs_seek_data(struct inode *inode, u64 bix);
550int logfs_open_segfile(struct super_block *sb);
551int logfs_init_rw(struct super_block *sb);
552void logfs_cleanup_rw(struct super_block *sb);
553void logfs_add_transaction(struct inode *inode, struct logfs_transaction *ta);
554void logfs_del_transaction(struct inode *inode, struct logfs_transaction *ta);
555void logfs_write_block(struct logfs_block *block, long flags);
556int logfs_write_obj_aliases_pagecache(struct super_block *sb);
557void logfs_get_segment_entry(struct super_block *sb, u32 segno,
558 struct logfs_segment_entry *se);
559void logfs_set_segment_used(struct super_block *sb, u64 ofs, int increment);
560void logfs_set_segment_erased(struct super_block *sb, u32 segno, u32 ec,
561 gc_level_t gc_level);
562void logfs_set_segment_reserved(struct super_block *sb, u32 segno);
563void logfs_set_segment_unreserved(struct super_block *sb, u32 segno, u32 ec);
564struct logfs_block *__alloc_block(struct super_block *sb,
565 u64 ino, u64 bix, level_t level);
566void __free_block(struct super_block *sb, struct logfs_block *block);
567void btree_write_block(struct logfs_block *block);
568void initialize_block_counters(struct page *page, struct logfs_block *block,
569 __be64 *array, int page_is_empty);
570int logfs_exist_block(struct inode *inode, u64 bix);
571int get_page_reserve(struct inode *inode, struct page *page);
572extern struct logfs_block_ops indirect_block_ops;
573
574/* segment.c */
575int logfs_erase_segment(struct super_block *sb, u32 ofs);
576int wbuf_read(struct super_block *sb, u64 ofs, size_t len, void *buf);
577int logfs_segment_read(struct inode *inode, struct page *page, u64 ofs, u64 bix,
578 level_t level);
579int logfs_segment_write(struct inode *inode, struct page *page,
580 struct logfs_shadow *shadow);
581int logfs_segment_delete(struct inode *inode, struct logfs_shadow *shadow);
582int logfs_load_object_aliases(struct super_block *sb,
583 struct logfs_obj_alias *oa, int count);
584void move_page_to_btree(struct page *page);
585int logfs_init_mapping(struct super_block *sb);
586void logfs_sync_area(struct logfs_area *area);
587void logfs_sync_segments(struct super_block *sb);
588
589/* area handling */
590int logfs_init_areas(struct super_block *sb);
591void logfs_cleanup_areas(struct super_block *sb);
592int logfs_open_area(struct logfs_area *area, size_t bytes);
593void __logfs_buf_write(struct logfs_area *area, u64 ofs, void *buf, size_t len,
594 int use_filler);
595
596static inline void logfs_buf_write(struct logfs_area *area, u64 ofs,
597 void *buf, size_t len)
598{
599 __logfs_buf_write(area, ofs, buf, len, 0);
600}
601
602static inline void logfs_buf_recover(struct logfs_area *area, u64 ofs,
603 void *buf, size_t len)
604{
605 __logfs_buf_write(area, ofs, buf, len, 1);
606}
607
608/* super.c */
609struct page *emergency_read_begin(struct address_space *mapping, pgoff_t index);
610void emergency_read_end(struct page *page);
611void logfs_crash_dump(struct super_block *sb);
612void *memchr_inv(const void *s, int c, size_t n);
613int logfs_statfs(struct dentry *dentry, struct kstatfs *stats);
614int logfs_get_sb_device(struct file_system_type *type, int flags,
615 struct mtd_info *mtd, struct block_device *bdev,
616 const struct logfs_device_ops *devops, struct vfsmount *mnt);
617int logfs_check_ds(struct logfs_disk_super *ds);
618int logfs_write_sb(struct super_block *sb);
619
620static inline struct logfs_super *logfs_super(struct super_block *sb)
621{
622 return sb->s_fs_info;
623}
624
625static inline struct logfs_inode *logfs_inode(struct inode *inode)
626{
627 return container_of(inode, struct logfs_inode, vfs_inode);
628}
629
630static inline void logfs_set_ro(struct super_block *sb)
631{
632 logfs_super(sb)->s_flags |= LOGFS_SB_FLAG_RO;
633}
634
635#define LOGFS_BUG(sb) do { \
636 struct super_block *__sb = sb; \
637 logfs_crash_dump(__sb); \
638 logfs_super(__sb)->s_flags |= LOGFS_SB_FLAG_RO; \
639 BUG(); \
640} while (0)
641
642#define LOGFS_BUG_ON(condition, sb) \
643 do { if (unlikely(condition)) LOGFS_BUG((sb)); } while (0)
644
645static inline __be32 logfs_crc32(void *data, size_t len, size_t skip)
646{
647 return cpu_to_be32(crc32(~0, data+skip, len-skip));
648}
649
650static inline u8 logfs_type(struct inode *inode)
651{
652 return (inode->i_mode >> 12) & 15;
653}
654
655static inline pgoff_t logfs_index(struct super_block *sb, u64 pos)
656{
657 return pos >> sb->s_blocksize_bits;
658}
659
660static inline u64 dev_ofs(struct super_block *sb, u32 segno, u32 ofs)
661{
662 return ((u64)segno << logfs_super(sb)->s_segshift) + ofs;
663}
664
665static inline u32 seg_no(struct super_block *sb, u64 ofs)
666{
667 return ofs >> logfs_super(sb)->s_segshift;
668}
669
670static inline u32 seg_ofs(struct super_block *sb, u64 ofs)
671{
672 return ofs & logfs_super(sb)->s_segmask;
673}
674
675static inline u64 seg_align(struct super_block *sb, u64 ofs)
676{
677 return ofs & ~logfs_super(sb)->s_segmask;
678}
679
680static inline struct logfs_block *logfs_block(struct page *page)
681{
682 return (void *)page->private;
683}
684
685static inline level_t shrink_level(gc_level_t __level)
686{
687 u8 level = (__force u8)__level;
688
689 if (level >= LOGFS_MAX_LEVELS)
690 level -= LOGFS_MAX_LEVELS;
691 return (__force level_t)level;
692}
693
694static inline gc_level_t expand_level(u64 ino, level_t __level)
695{
696 u8 level = (__force u8)__level;
697
698 if (ino == LOGFS_INO_MASTER) {
699 /* ifile has seperate areas */
700 level += LOGFS_MAX_LEVELS;
701 }
702 return (__force gc_level_t)level;
703}
704
705static inline int logfs_block_shift(struct super_block *sb, level_t level)
706{
707 level = shrink_level((__force gc_level_t)level);
708 return (__force int)level * (sb->s_blocksize_bits - 3);
709}
710
711static inline u64 logfs_block_mask(struct super_block *sb, level_t level)
712{
713 return ~0ull << logfs_block_shift(sb, level);
714}
715
716static inline struct logfs_area *get_area(struct super_block *sb,
717 gc_level_t gc_level)
718{
719 return logfs_super(sb)->s_area[(__force u8)gc_level];
720}
721
722#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-22 20:45:44 -0500