logfs: remove from tree

Logfs was introduced to the kernel in 2009, and hasn't seen any non
drive-by changes since 2012, while having lots of unsolved issues
including the complete lack of error handling, with more and more
issues popping up without any fixes.

The logfs.org domain has been bouncing from a mail, and the maintainer
on the non-logfs.org domain hasn't repsonded to past queries either.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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