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-rw-r--r--fs/logfs/logfs.h735
1 files changed, 0 insertions, 735 deletions
diff --git a/fs/logfs/logfs.h b/fs/logfs/logfs.h
deleted file mode 100644
index 27d040e35faa..000000000000
--- a/fs/logfs/logfs.h
+++ /dev/null
@@ -1,735 +0,0 @@
-/*
- * fs/logfs/logfs.h
- *
- * As should be obvious for Linux kernel code, license is GPLv2
- *
- * Copyright (c) 2005-2008 Joern Engel <joern@logfs.org>
- *
- * Private header for logfs.
- */
-#ifndef FS_LOGFS_LOGFS_H
-#define FS_LOGFS_LOGFS_H
-
-#undef __CHECK_ENDIAN__
-#define __CHECK_ENDIAN__
-
-#include <linux/btree.h>
-#include <linux/crc32.h>
-#include <linux/fs.h>
-#include <linux/kernel.h>
-#include <linux/mempool.h>
-#include <linux/pagemap.h>
-#include <linux/mtd/mtd.h>
-#include "logfs_abi.h"
-
-#define LOGFS_DEBUG_SUPER (0x0001)
-#define LOGFS_DEBUG_SEGMENT (0x0002)
-#define LOGFS_DEBUG_JOURNAL (0x0004)
-#define LOGFS_DEBUG_DIR (0x0008)
-#define LOGFS_DEBUG_FILE (0x0010)
-#define LOGFS_DEBUG_INODE (0x0020)
-#define LOGFS_DEBUG_READWRITE (0x0040)
-#define LOGFS_DEBUG_GC (0x0080)
-#define LOGFS_DEBUG_GC_NOISY (0x0100)
-#define LOGFS_DEBUG_ALIASES (0x0200)
-#define LOGFS_DEBUG_BLOCKMOVE (0x0400)
-#define LOGFS_DEBUG_ALL (0xffffffff)
-
-#define LOGFS_DEBUG (0x01)
-/*
- * To enable specific log messages, simply define LOGFS_DEBUG to match any
- * or all of the above.
- */
-#ifndef LOGFS_DEBUG
-#define LOGFS_DEBUG (0)
-#endif
-
-#define log_cond(cond, fmt, arg...) do { \
- if (cond) \
- printk(KERN_DEBUG fmt, ##arg); \
-} while (0)
-
-#define log_super(fmt, arg...) \
- log_cond(LOGFS_DEBUG & LOGFS_DEBUG_SUPER, fmt, ##arg)
-#define log_segment(fmt, arg...) \
- log_cond(LOGFS_DEBUG & LOGFS_DEBUG_SEGMENT, fmt, ##arg)
-#define log_journal(fmt, arg...) \
- log_cond(LOGFS_DEBUG & LOGFS_DEBUG_JOURNAL, fmt, ##arg)
-#define log_dir(fmt, arg...) \
- log_cond(LOGFS_DEBUG & LOGFS_DEBUG_DIR, fmt, ##arg)
-#define log_file(fmt, arg...) \
- log_cond(LOGFS_DEBUG & LOGFS_DEBUG_FILE, fmt, ##arg)
-#define log_inode(fmt, arg...) \
- log_cond(LOGFS_DEBUG & LOGFS_DEBUG_INODE, fmt, ##arg)
-#define log_readwrite(fmt, arg...) \
- log_cond(LOGFS_DEBUG & LOGFS_DEBUG_READWRITE, fmt, ##arg)
-#define log_gc(fmt, arg...) \
- log_cond(LOGFS_DEBUG & LOGFS_DEBUG_GC, fmt, ##arg)
-#define log_gc_noisy(fmt, arg...) \
- log_cond(LOGFS_DEBUG & LOGFS_DEBUG_GC_NOISY, fmt, ##arg)
-#define log_aliases(fmt, arg...) \
- log_cond(LOGFS_DEBUG & LOGFS_DEBUG_ALIASES, fmt, ##arg)
-#define log_blockmove(fmt, arg...) \
- log_cond(LOGFS_DEBUG & LOGFS_DEBUG_BLOCKMOVE, fmt, ##arg)
-
-#define PG_pre_locked PG_owner_priv_1
-#define PagePreLocked(page) test_bit(PG_pre_locked, &(page)->flags)
-#define SetPagePreLocked(page) set_bit(PG_pre_locked, &(page)->flags)
-#define ClearPagePreLocked(page) clear_bit(PG_pre_locked, &(page)->flags)
-
-/* FIXME: This should really be somewhere in the 64bit area. */
-#define LOGFS_LINK_MAX (1<<30)
-
-/* Read-only filesystem */
-#define LOGFS_SB_FLAG_RO 0x0001
-#define LOGFS_SB_FLAG_DIRTY 0x0002
-#define LOGFS_SB_FLAG_OBJ_ALIAS 0x0004
-#define LOGFS_SB_FLAG_SHUTDOWN 0x0008
-
-/* Write Control Flags */
-#define WF_LOCK 0x01 /* take write lock */
-#define WF_WRITE 0x02 /* write block */
-#define WF_DELETE 0x04 /* delete old block */
-
-typedef u8 __bitwise level_t;
-typedef u8 __bitwise gc_level_t;
-
-#define LEVEL(level) ((__force level_t)(level))
-#define GC_LEVEL(gc_level) ((__force gc_level_t)(gc_level))
-
-#define SUBLEVEL(level) ( (void)((level) == LEVEL(1)), \
- (__force level_t)((__force u8)(level) - 1) )
-
-/**
- * struct logfs_area - area management information
- *
- * @a_sb: the superblock this area belongs to
- * @a_is_open: 1 if the area is currently open, else 0
- * @a_segno: segment number of area
- * @a_written_bytes: number of bytes already written back
- * @a_used_bytes: number of used bytes
- * @a_ops: area operations (either journal or ostore)
- * @a_erase_count: erase count
- * @a_level: GC level
- */
-struct logfs_area { /* a segment open for writing */
- struct super_block *a_sb;
- int a_is_open;
- u32 a_segno;
- u32 a_written_bytes;
- u32 a_used_bytes;
- const struct logfs_area_ops *a_ops;
- u32 a_erase_count;
- gc_level_t a_level;
-};
-
-/**
- * struct logfs_area_ops - area operations
- *
- * @get_free_segment: fill area->ofs with the offset of a free segment
- * @get_erase_count: fill area->erase_count (needs area->ofs)
- * @erase_segment: erase and setup segment
- */
-struct logfs_area_ops {
- void (*get_free_segment)(struct logfs_area *area);
- void (*get_erase_count)(struct logfs_area *area);
- int (*erase_segment)(struct logfs_area *area);
-};
-
-struct logfs_super; /* forward */
-/**
- * struct logfs_device_ops - device access operations
- *
- * @readpage: read one page (mm page)
- * @writeseg: write one segment. may be a partial segment
- * @erase: erase one segment
- * @read: read from the device
- * @erase: erase part of the device
- * @can_write_buf: decide whether wbuf can be written to ofs
- */
-struct logfs_device_ops {
- struct page *(*find_first_sb)(struct super_block *sb, u64 *ofs);
- struct page *(*find_last_sb)(struct super_block *sb, u64 *ofs);
- int (*write_sb)(struct super_block *sb, struct page *page);
- int (*readpage)(void *_sb, struct page *page);
- void (*writeseg)(struct super_block *sb, u64 ofs, size_t len);
- int (*erase)(struct super_block *sb, loff_t ofs, size_t len,
- int ensure_write);
- int (*can_write_buf)(struct super_block *sb, u64 ofs);
- void (*sync)(struct super_block *sb);
- void (*put_device)(struct logfs_super *s);
-};
-
-/**
- * struct candidate_list - list of similar candidates
- */
-struct candidate_list {
- struct rb_root rb_tree;
- int count;
- int maxcount;
- int sort_by_ec;
-};
-
-/**
- * struct gc_candidate - "candidate" segment to be garbage collected next
- *
- * @list: list (either free of low)
- * @segno: segment number
- * @valid: number of valid bytes
- * @erase_count: erase count of segment
- * @dist: distance from tree root
- *
- * Candidates can be on two lists. The free list contains electees rather
- * than candidates - segments that no longer contain any valid data. The
- * low list contains candidates to be picked for GC. It should be kept
- * short. It is not required to always pick a perfect candidate. In the
- * worst case GC will have to move more data than absolutely necessary.
- */
-struct gc_candidate {
- struct rb_node rb_node;
- struct candidate_list *list;
- u32 segno;
- u32 valid;
- u32 erase_count;
- u8 dist;
-};
-
-/**
- * struct logfs_journal_entry - temporary structure used during journal scan
- *
- * @used:
- * @version: normalized version
- * @len: length
- * @offset: offset
- */
-struct logfs_journal_entry {
- int used;
- s16 version;
- u16 len;
- u16 datalen;
- u64 offset;
-};
-
-enum transaction_state {
- CREATE_1 = 1,
- CREATE_2,
- UNLINK_1,
- UNLINK_2,
- CROSS_RENAME_1,
- CROSS_RENAME_2,
- TARGET_RENAME_1,
- TARGET_RENAME_2,
- TARGET_RENAME_3
-};
-
-/**
- * struct logfs_transaction - essential fields to support atomic dirops
- *
- * @ino: target inode
- * @dir: inode of directory containing dentry
- * @pos: pos of dentry in directory
- */
-struct logfs_transaction {
- enum transaction_state state;
- u64 ino;
- u64 dir;
- u64 pos;
-};
-
-/**
- * struct logfs_shadow - old block in the shadow of a not-yet-committed new one
- * @old_ofs: offset of old block on medium
- * @new_ofs: offset of new block on medium
- * @ino: inode number
- * @bix: block index
- * @old_len: size of old block, including header
- * @new_len: size of new block, including header
- * @level: block level
- */
-struct logfs_shadow {
- u64 old_ofs;
- u64 new_ofs;
- u64 ino;
- u64 bix;
- int old_len;
- int new_len;
- gc_level_t gc_level;
-};
-
-/**
- * struct shadow_tree
- * @new: shadows where old_ofs==0, indexed by new_ofs
- * @old: shadows where old_ofs!=0, indexed by old_ofs
- * @segment_map: bitfield of segments containing shadows
- * @no_shadowed_segment: number of segments containing shadows
- */
-struct shadow_tree {
- struct btree_head64 new;
- struct btree_head64 old;
- struct btree_head32 segment_map;
- int no_shadowed_segments;
-};
-
-struct object_alias_item {
- struct list_head list;
- __be64 val;
- int child_no;
-};
-
-/**
- * struct logfs_block - contains any block state
- * @type: indirect block or inode
- * @full: number of fully populated children
- * @partial: number of partially populated children
- *
- * Most blocks are directly represented by page cache pages. But when a block
- * becomes dirty, is part of a transaction, contains aliases or is otherwise
- * special, a struct logfs_block is allocated to track the additional state.
- * Inodes are very similar to indirect blocks, so they can also get one of
- * these structures added when appropriate.
- */
-#define BLOCK_INDIRECT 1 /* Indirect block */
-#define BLOCK_INODE 2 /* Inode */
-struct logfs_block_ops;
-struct logfs_block {
- struct list_head alias_list;
- struct list_head item_list;
- struct super_block *sb;
- u64 ino;
- u64 bix;
- level_t level;
- struct page *page;
- struct inode *inode;
- struct logfs_transaction *ta;
- unsigned long alias_map[LOGFS_BLOCK_FACTOR / BITS_PER_LONG];
- const struct logfs_block_ops *ops;
- int full;
- int partial;
- int reserved_bytes;
-};
-
-typedef int write_alias_t(struct super_block *sb, u64 ino, u64 bix,
- level_t level, int child_no, __be64 val);
-struct logfs_block_ops {
- void (*write_block)(struct logfs_block *block);
- void (*free_block)(struct super_block *sb, struct logfs_block*block);
- int (*write_alias)(struct super_block *sb,
- struct logfs_block *block,
- write_alias_t *write_one_alias);
-};
-
-#define MAX_JOURNAL_ENTRIES 256
-
-struct logfs_super {
- struct mtd_info *s_mtd; /* underlying device */
- struct block_device *s_bdev; /* underlying device */
- const struct logfs_device_ops *s_devops;/* device access */
- struct inode *s_master_inode; /* inode file */
- struct inode *s_segfile_inode; /* segment file */
- struct inode *s_mapping_inode; /* device mapping */
- atomic_t s_pending_writes; /* outstanting bios */
- long s_flags;
- mempool_t *s_btree_pool; /* for btree nodes */
- mempool_t *s_alias_pool; /* aliases in segment.c */
- u64 s_feature_incompat;
- u64 s_feature_ro_compat;
- u64 s_feature_compat;
- u64 s_feature_flags;
- u64 s_sb_ofs[2];
- struct page *s_erase_page; /* for dev_bdev.c */
- /* alias.c fields */
- struct btree_head32 s_segment_alias; /* remapped segments */
- int s_no_object_aliases;
- struct list_head s_object_alias; /* remapped objects */
- struct btree_head128 s_object_alias_tree; /* remapped objects */
- struct mutex s_object_alias_mutex;
- /* dir.c fields */
- struct mutex s_dirop_mutex; /* for creat/unlink/rename */
- u64 s_victim_ino; /* used for atomic dir-ops */
- u64 s_rename_dir; /* source directory ino */
- u64 s_rename_pos; /* position of source dd */
- /* gc.c fields */
- long s_segsize; /* size of a segment */
- int s_segshift; /* log2 of segment size */
- long s_segmask; /* 1 << s_segshift - 1 */
- long s_no_segs; /* segments on device */
- long s_no_journal_segs; /* segments used for journal */
- long s_no_blocks; /* blocks per segment */
- long s_writesize; /* minimum write size */
- int s_writeshift; /* log2 of write size */
- u64 s_size; /* filesystem size */
- struct logfs_area *s_area[LOGFS_NO_AREAS]; /* open segment array */
- u64 s_gec; /* global erase count */
- u64 s_wl_gec_ostore; /* time of last wl event */
- u64 s_wl_gec_journal; /* time of last wl event */
- u64 s_sweeper; /* current sweeper pos */
- u8 s_ifile_levels; /* max level of ifile */
- u8 s_iblock_levels; /* max level of regular files */
- u8 s_data_levels; /* # of segments to leaf block*/
- u8 s_total_levels; /* sum of above three */
- struct btree_head32 s_cand_tree; /* all candidates */
- struct candidate_list s_free_list; /* 100% free segments */
- struct candidate_list s_reserve_list; /* Bad segment reserve */
- struct candidate_list s_low_list[LOGFS_NO_AREAS];/* good candidates */
- struct candidate_list s_ec_list; /* wear level candidates */
- struct btree_head32 s_reserved_segments;/* sb, journal, bad, etc. */
- /* inode.c fields */
- u64 s_last_ino; /* highest ino used */
- long s_inos_till_wrap;
- u32 s_generation; /* i_generation for new files */
- struct list_head s_freeing_list; /* inodes being freed */
- /* journal.c fields */
- struct mutex s_journal_mutex;
- void *s_je; /* journal entry to compress */
- void *s_compressed_je; /* block to write to journal */
- u32 s_journal_seg[LOGFS_JOURNAL_SEGS]; /* journal segments */
- u32 s_journal_ec[LOGFS_JOURNAL_SEGS]; /* journal erasecounts */
- u64 s_last_version;
- struct logfs_area *s_journal_area; /* open journal segment */
- __be64 s_je_array[MAX_JOURNAL_ENTRIES];
- int s_no_je;
-
- int s_sum_index; /* for the 12 summaries */
- struct shadow_tree s_shadow_tree;
- int s_je_fill; /* index of current je */
- /* readwrite.c fields */
- struct mutex s_write_mutex;
- int s_lock_count;
- mempool_t *s_block_pool; /* struct logfs_block pool */
- mempool_t *s_shadow_pool; /* struct logfs_shadow pool */
- struct list_head s_writeback_list; /* writeback pages */
- /*
- * Space accounting:
- * - s_used_bytes specifies space used to store valid data objects.
- * - s_dirty_used_bytes is space used to store non-committed data
- * objects. Those objects have already been written themselves,
- * but they don't become valid until all indirect blocks up to the
- * journal have been written as well.
- * - s_dirty_free_bytes is space used to store the old copy of a
- * replaced object, as long as the replacement is non-committed.
- * In other words, it is the amount of space freed when all dirty
- * blocks are written back.
- * - s_free_bytes is the amount of free space available for any
- * purpose.
- * - s_root_reserve is the amount of free space available only to
- * the root user. Non-privileged users can no longer write once
- * this watermark has been reached.
- * - s_speed_reserve is space which remains unused to speed up
- * garbage collection performance.
- * - s_dirty_pages is the space reserved for currently dirty pages.
- * It is a pessimistic estimate, so some/most will get freed on
- * page writeback.
- *
- * s_used_bytes + s_free_bytes + s_speed_reserve = total usable size
- */
- u64 s_free_bytes;
- u64 s_used_bytes;
- u64 s_dirty_free_bytes;
- u64 s_dirty_used_bytes;
- u64 s_root_reserve;
- u64 s_speed_reserve;
- u64 s_dirty_pages;
- /* Bad block handling:
- * - s_bad_seg_reserve is a number of segments usually kept
- * free. When encountering bad blocks, the affected segment's data
- * is _temporarily_ moved to a reserved segment.
- * - s_bad_segments is the number of known bad segments.
- */
- u32 s_bad_seg_reserve;
- u32 s_bad_segments;
-};
-
-/**
- * struct logfs_inode - in-memory inode
- *
- * @vfs_inode: struct inode
- * @li_data: data pointers
- * @li_used_bytes: number of used bytes
- * @li_freeing_list: used to track inodes currently being freed
- * @li_flags: inode flags
- * @li_refcount: number of internal (GC-induced) references
- */
-struct logfs_inode {
- struct inode vfs_inode;
- u64 li_data[LOGFS_EMBEDDED_FIELDS];
- u64 li_used_bytes;
- struct list_head li_freeing_list;
- struct logfs_block *li_block;
- u32 li_flags;
- u8 li_height;
- int li_refcount;
-};
-
-#define journal_for_each(__i) for (__i = 0; __i < LOGFS_JOURNAL_SEGS; __i++)
-#define for_each_area(__i) for (__i = 0; __i < LOGFS_NO_AREAS; __i++)
-#define for_each_area_down(__i) for (__i = LOGFS_NO_AREAS - 1; __i >= 0; __i--)
-
-/* compr.c */
-int logfs_compress(void *in, void *out, size_t inlen, size_t outlen);
-int logfs_uncompress(void *in, void *out, size_t inlen, size_t outlen);
-int __init logfs_compr_init(void);
-void logfs_compr_exit(void);
-
-/* dev_bdev.c */
-#ifdef CONFIG_BLOCK
-int logfs_get_sb_bdev(struct logfs_super *s,
- struct file_system_type *type,
- const char *devname);
-#else
-static inline int logfs_get_sb_bdev(struct logfs_super *s,
- struct file_system_type *type,
- const char *devname)
-{
- return -ENODEV;
-}
-#endif
-
-/* dev_mtd.c */
-#if IS_ENABLED(CONFIG_MTD)
-int logfs_get_sb_mtd(struct logfs_super *s, int mtdnr);
-#else
-static inline int logfs_get_sb_mtd(struct logfs_super *s, int mtdnr)
-{
- return -ENODEV;
-}
-#endif
-
-/* dir.c */
-extern const struct inode_operations logfs_dir_iops;
-extern const struct file_operations logfs_dir_fops;
-int logfs_replay_journal(struct super_block *sb);
-
-/* file.c */
-extern const struct inode_operations logfs_reg_iops;
-extern const struct file_operations logfs_reg_fops;
-extern const struct address_space_operations logfs_reg_aops;
-int logfs_readpage(struct file *file, struct page *page);
-long logfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
-int logfs_fsync(struct file *file, loff_t start, loff_t end, int datasync);
-
-/* gc.c */
-u32 get_best_cand(struct super_block *sb, struct candidate_list *list, u32 *ec);
-void logfs_gc_pass(struct super_block *sb);
-int logfs_check_areas(struct super_block *sb);
-int logfs_init_gc(struct super_block *sb);
-void logfs_cleanup_gc(struct super_block *sb);
-
-/* inode.c */
-extern const struct super_operations logfs_super_operations;
-struct inode *logfs_iget(struct super_block *sb, ino_t ino);
-struct inode *logfs_safe_iget(struct super_block *sb, ino_t ino, int *cookie);
-void logfs_safe_iput(struct inode *inode, int cookie);
-struct inode *logfs_new_inode(struct inode *dir, umode_t mode);
-struct inode *logfs_new_meta_inode(struct super_block *sb, u64 ino);
-struct inode *logfs_read_meta_inode(struct super_block *sb, u64 ino);
-int logfs_init_inode_cache(void);
-void logfs_destroy_inode_cache(void);
-void logfs_set_blocks(struct inode *inode, u64 no);
-/* these logically belong into inode.c but actually reside in readwrite.c */
-int logfs_read_inode(struct inode *inode);
-int __logfs_write_inode(struct inode *inode, struct page *, long flags);
-void logfs_evict_inode(struct inode *inode);
-
-/* journal.c */
-void logfs_write_anchor(struct super_block *sb);
-int logfs_init_journal(struct super_block *sb);
-void logfs_cleanup_journal(struct super_block *sb);
-int write_alias_journal(struct super_block *sb, u64 ino, u64 bix,
- level_t level, int child_no, __be64 val);
-void do_logfs_journal_wl_pass(struct super_block *sb);
-
-/* readwrite.c */
-pgoff_t logfs_pack_index(u64 bix, level_t level);
-void logfs_unpack_index(pgoff_t index, u64 *bix, level_t *level);
-int logfs_inode_write(struct inode *inode, const void *buf, size_t count,
- loff_t bix, long flags, struct shadow_tree *shadow_tree);
-int logfs_readpage_nolock(struct page *page);
-int logfs_write_buf(struct inode *inode, struct page *page, long flags);
-int logfs_delete(struct inode *inode, pgoff_t index,
- struct shadow_tree *shadow_tree);
-int logfs_rewrite_block(struct inode *inode, u64 bix, u64 ofs,
- gc_level_t gc_level, long flags);
-int logfs_is_valid_block(struct super_block *sb, u64 ofs, u64 ino, u64 bix,
- gc_level_t gc_level);
-int logfs_truncate(struct inode *inode, u64 size);
-u64 logfs_seek_hole(struct inode *inode, u64 bix);
-u64 logfs_seek_data(struct inode *inode, u64 bix);
-int logfs_open_segfile(struct super_block *sb);
-int logfs_init_rw(struct super_block *sb);
-void logfs_cleanup_rw(struct super_block *sb);
-void logfs_add_transaction(struct inode *inode, struct logfs_transaction *ta);
-void logfs_del_transaction(struct inode *inode, struct logfs_transaction *ta);
-void logfs_write_block(struct logfs_block *block, long flags);
-int logfs_write_obj_aliases_pagecache(struct super_block *sb);
-void logfs_get_segment_entry(struct super_block *sb, u32 segno,
- struct logfs_segment_entry *se);
-void logfs_set_segment_used(struct super_block *sb, u64 ofs, int increment);
-void logfs_set_segment_erased(struct super_block *sb, u32 segno, u32 ec,
- gc_level_t gc_level);
-void logfs_set_segment_reserved(struct super_block *sb, u32 segno);
-void logfs_set_segment_unreserved(struct super_block *sb, u32 segno, u32 ec);
-struct logfs_block *__alloc_block(struct super_block *sb,
- u64 ino, u64 bix, level_t level);
-void __free_block(struct super_block *sb, struct logfs_block *block);
-void btree_write_block(struct logfs_block *block);
-void initialize_block_counters(struct page *page, struct logfs_block *block,
- __be64 *array, int page_is_empty);
-int logfs_exist_block(struct inode *inode, u64 bix);
-int get_page_reserve(struct inode *inode, struct page *page);
-void logfs_get_wblocks(struct super_block *sb, struct page *page, int lock);
-void logfs_put_wblocks(struct super_block *sb, struct page *page, int lock);
-extern const struct logfs_block_ops indirect_block_ops;
-
-/* segment.c */
-int logfs_erase_segment(struct super_block *sb, u32 ofs, int ensure_erase);
-int wbuf_read(struct super_block *sb, u64 ofs, size_t len, void *buf);
-int logfs_segment_read(struct inode *inode, struct page *page, u64 ofs, u64 bix,
- level_t level);
-int logfs_segment_write(struct inode *inode, struct page *page,
- struct logfs_shadow *shadow);
-int logfs_segment_delete(struct inode *inode, struct logfs_shadow *shadow);
-int logfs_load_object_aliases(struct super_block *sb,
- struct logfs_obj_alias *oa, int count);
-void move_page_to_btree(struct page *page);
-int logfs_init_mapping(struct super_block *sb);
-void logfs_sync_area(struct logfs_area *area);
-void logfs_sync_segments(struct super_block *sb);
-void freeseg(struct super_block *sb, u32 segno);
-void free_areas(struct super_block *sb);
-
-/* area handling */
-int logfs_init_areas(struct super_block *sb);
-void logfs_cleanup_areas(struct super_block *sb);
-int logfs_open_area(struct logfs_area *area, size_t bytes);
-int __logfs_buf_write(struct logfs_area *area, u64 ofs, void *buf, size_t len,
- int use_filler);
-
-static inline int logfs_buf_write(struct logfs_area *area, u64 ofs,
- void *buf, size_t len)
-{
- return __logfs_buf_write(area, ofs, buf, len, 0);
-}
-
-static inline int logfs_buf_recover(struct logfs_area *area, u64 ofs,
- void *buf, size_t len)
-{
- return __logfs_buf_write(area, ofs, buf, len, 1);
-}
-
-/* super.c */
-struct page *emergency_read_begin(struct address_space *mapping, pgoff_t index);
-void emergency_read_end(struct page *page);
-void logfs_crash_dump(struct super_block *sb);
-int logfs_statfs(struct dentry *dentry, struct kstatfs *stats);
-int logfs_check_ds(struct logfs_disk_super *ds);
-int logfs_write_sb(struct super_block *sb);
-
-static inline struct logfs_super *logfs_super(struct super_block *sb)
-{
- return sb->s_fs_info;
-}
-
-static inline struct logfs_inode *logfs_inode(struct inode *inode)
-{
- return container_of(inode, struct logfs_inode, vfs_inode);
-}
-
-static inline void logfs_set_ro(struct super_block *sb)
-{
- logfs_super(sb)->s_flags |= LOGFS_SB_FLAG_RO;
-}
-
-#define LOGFS_BUG(sb) do { \
- struct super_block *__sb = sb; \
- logfs_crash_dump(__sb); \
- logfs_super(__sb)->s_flags |= LOGFS_SB_FLAG_RO; \
- BUG(); \
-} while (0)
-
-#define LOGFS_BUG_ON(condition, sb) \
- do { if (unlikely(condition)) LOGFS_BUG((sb)); } while (0)
-
-static inline __be32 logfs_crc32(void *data, size_t len, size_t skip)
-{
- return cpu_to_be32(crc32(~0, data+skip, len-skip));
-}
-
-static inline u8 logfs_type(struct inode *inode)
-{
- return (inode->i_mode >> 12) & 15;
-}
-
-static inline pgoff_t logfs_index(struct super_block *sb, u64 pos)
-{
- return pos >> sb->s_blocksize_bits;
-}
-
-static inline u64 dev_ofs(struct super_block *sb, u32 segno, u32 ofs)
-{
- return ((u64)segno << logfs_super(sb)->s_segshift) + ofs;
-}
-
-static inline u32 seg_no(struct super_block *sb, u64 ofs)
-{
- return ofs >> logfs_super(sb)->s_segshift;
-}
-
-static inline u32 seg_ofs(struct super_block *sb, u64 ofs)
-{
- return ofs & logfs_super(sb)->s_segmask;
-}
-
-static inline u64 seg_align(struct super_block *sb, u64 ofs)
-{
- return ofs & ~logfs_super(sb)->s_segmask;
-}
-
-static inline struct logfs_block *logfs_block(struct page *page)
-{
- return (void *)page->private;
-}
-
-static inline level_t shrink_level(gc_level_t __level)
-{
- u8 level = (__force u8)__level;
-
- if (level >= LOGFS_MAX_LEVELS)
- level -= LOGFS_MAX_LEVELS;
- return (__force level_t)level;
-}
-
-static inline gc_level_t expand_level(u64 ino, level_t __level)
-{
- u8 level = (__force u8)__level;
-
- if (ino == LOGFS_INO_MASTER) {
- /* ifile has separate areas */
- level += LOGFS_MAX_LEVELS;
- }
- return (__force gc_level_t)level;
-}
-
-static inline int logfs_block_shift(struct super_block *sb, level_t level)
-{
- level = shrink_level((__force gc_level_t)level);
- return (__force int)level * (sb->s_blocksize_bits - 3);
-}
-
-static inline u64 logfs_block_mask(struct super_block *sb, level_t level)
-{
- return ~0ull << logfs_block_shift(sb, level);
-}
-
-static inline struct logfs_area *get_area(struct super_block *sb,
- gc_level_t gc_level)
-{
- return logfs_super(sb)->s_area[(__force u8)gc_level];
-}
-
-static inline void logfs_mempool_destroy(mempool_t *pool)
-{
- if (pool)
- mempool_destroy(pool);
-}
-
-#endif
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-11-30 16:49:04 +0000