f2fs.h 35.2 KB
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/*
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 * fs/f2fs/f2fs.h
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *             http://www.samsung.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef _LINUX_F2FS_H
#define _LINUX_F2FS_H

#include <linux/types.h>
#include <linux/page-flags.h>
#include <linux/buffer_head.h>
#include <linux/slab.h>
#include <linux/crc32.h>
#include <linux/magic.h>
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#include <linux/kobject.h>
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/*
 * For mount options
 */
#define F2FS_MOUNT_BG_GC		0x00000001
#define F2FS_MOUNT_DISABLE_ROLL_FORWARD	0x00000002
#define F2FS_MOUNT_DISCARD		0x00000004
#define F2FS_MOUNT_NOHEAP		0x00000008
#define F2FS_MOUNT_XATTR_USER		0x00000010
#define F2FS_MOUNT_POSIX_ACL		0x00000020
#define F2FS_MOUNT_DISABLE_EXT_IDENTIFY	0x00000040
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#define F2FS_MOUNT_INLINE_XATTR		0x00000080
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#define clear_opt(sbi, option)	(sbi->mount_opt.opt &= ~F2FS_MOUNT_##option)
#define set_opt(sbi, option)	(sbi->mount_opt.opt |= F2FS_MOUNT_##option)
#define test_opt(sbi, option)	(sbi->mount_opt.opt & F2FS_MOUNT_##option)

#define ver_after(a, b)	(typecheck(unsigned long long, a) &&		\
		typecheck(unsigned long long, b) &&			\
		((long long)((a) - (b)) > 0))

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typedef u32 block_t;	/*
			 * should not change u32, since it is the on-disk block
			 * address format, __le32.
			 */
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typedef u32 nid_t;

struct f2fs_mount_info {
	unsigned int	opt;
};

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#define CRCPOLY_LE 0xedb88320

static inline __u32 f2fs_crc32(void *buf, size_t len)
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{
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	unsigned char *p = (unsigned char *)buf;
	__u32 crc = F2FS_SUPER_MAGIC;
	int i;

	while (len--) {
		crc ^= *p++;
		for (i = 0; i < 8; i++)
			crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
	}
	return crc;
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}

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static inline bool f2fs_crc_valid(__u32 blk_crc, void *buf, size_t buf_size)
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{
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	return f2fs_crc32(buf, buf_size) == blk_crc;
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}

/*
 * For checkpoint manager
 */
enum {
	NAT_BITMAP,
	SIT_BITMAP
};

/* for the list of orphan inodes */
struct orphan_inode_entry {
	struct list_head list;	/* list head */
	nid_t ino;		/* inode number */
};

/* for the list of directory inodes */
struct dir_inode_entry {
	struct list_head list;	/* list head */
	struct inode *inode;	/* vfs inode pointer */
};

/* for the list of fsync inodes, used only during recovery */
struct fsync_inode_entry {
	struct list_head list;	/* list head */
	struct inode *inode;	/* vfs inode pointer */
	block_t blkaddr;	/* block address locating the last inode */
};

#define nats_in_cursum(sum)		(le16_to_cpu(sum->n_nats))
#define sits_in_cursum(sum)		(le16_to_cpu(sum->n_sits))

#define nat_in_journal(sum, i)		(sum->nat_j.entries[i].ne)
#define nid_in_journal(sum, i)		(sum->nat_j.entries[i].nid)
#define sit_in_journal(sum, i)		(sum->sit_j.entries[i].se)
#define segno_in_journal(sum, i)	(sum->sit_j.entries[i].segno)

static inline int update_nats_in_cursum(struct f2fs_summary_block *rs, int i)
{
	int before = nats_in_cursum(rs);
	rs->n_nats = cpu_to_le16(before + i);
	return before;
}

static inline int update_sits_in_cursum(struct f2fs_summary_block *rs, int i)
{
	int before = sits_in_cursum(rs);
	rs->n_sits = cpu_to_le16(before + i);
	return before;
}

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/*
 * ioctl commands
 */
#define F2FS_IOC_GETFLAGS               FS_IOC_GETFLAGS
#define F2FS_IOC_SETFLAGS               FS_IOC_SETFLAGS

#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
/*
 * ioctl commands in 32 bit emulation
 */
#define F2FS_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
#define F2FS_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
#endif

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/*
 * For INODE and NODE manager
 */
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/*
 * XATTR_NODE_OFFSET stores xattrs to one node block per file keeping -1
 * as its node offset to distinguish from index node blocks.
 * But some bits are used to mark the node block.
 */
#define XATTR_NODE_OFFSET	((((unsigned int)-1) << OFFSET_BIT_SHIFT) \
				>> OFFSET_BIT_SHIFT)
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enum {
	ALLOC_NODE,			/* allocate a new node page if needed */
	LOOKUP_NODE,			/* look up a node without readahead */
	LOOKUP_NODE_RA,			/*
					 * look up a node with readahead called
					 * by get_datablock_ro.
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					 */
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};

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#define F2FS_LINK_MAX		32000	/* maximum link count per file */

/* for in-memory extent cache entry */
struct extent_info {
	rwlock_t ext_lock;	/* rwlock for consistency */
	unsigned int fofs;	/* start offset in a file */
	u32 blk_addr;		/* start block address of the extent */
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	unsigned int len;	/* length of the extent */
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};

/*
 * i_advise uses FADVISE_XXX_BIT. We can add additional hints later.
 */
#define FADVISE_COLD_BIT	0x01
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#define FADVISE_LOST_PINO_BIT	0x02
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struct f2fs_inode_info {
	struct inode vfs_inode;		/* serve a vfs inode */
	unsigned long i_flags;		/* keep an inode flags for ioctl */
	unsigned char i_advise;		/* use to give file attribute hints */
	unsigned int i_current_depth;	/* use only in directory structure */
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	unsigned int i_pino;		/* parent inode number */
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	umode_t i_acl_mode;		/* keep file acl mode temporarily */

	/* Use below internally in f2fs*/
	unsigned long flags;		/* use to pass per-file flags */
	atomic_t dirty_dents;		/* # of dirty dentry pages */
	f2fs_hash_t chash;		/* hash value of given file name */
	unsigned int clevel;		/* maximum level of given file name */
	nid_t i_xattr_nid;		/* node id that contains xattrs */
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	unsigned long long xattr_ver;	/* cp version of xattr modification */
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	struct extent_info ext;		/* in-memory extent cache entry */
};

static inline void get_extent_info(struct extent_info *ext,
					struct f2fs_extent i_ext)
{
	write_lock(&ext->ext_lock);
	ext->fofs = le32_to_cpu(i_ext.fofs);
	ext->blk_addr = le32_to_cpu(i_ext.blk_addr);
	ext->len = le32_to_cpu(i_ext.len);
	write_unlock(&ext->ext_lock);
}

static inline void set_raw_extent(struct extent_info *ext,
					struct f2fs_extent *i_ext)
{
	read_lock(&ext->ext_lock);
	i_ext->fofs = cpu_to_le32(ext->fofs);
	i_ext->blk_addr = cpu_to_le32(ext->blk_addr);
	i_ext->len = cpu_to_le32(ext->len);
	read_unlock(&ext->ext_lock);
}

struct f2fs_nm_info {
	block_t nat_blkaddr;		/* base disk address of NAT */
	nid_t max_nid;			/* maximum possible node ids */
	nid_t next_scan_nid;		/* the next nid to be scanned */

	/* NAT cache management */
	struct radix_tree_root nat_root;/* root of the nat entry cache */
	rwlock_t nat_tree_lock;		/* protect nat_tree_lock */
	unsigned int nat_cnt;		/* the # of cached nat entries */
	struct list_head nat_entries;	/* cached nat entry list (clean) */
	struct list_head dirty_nat_entries; /* cached nat entry list (dirty) */

	/* free node ids management */
	struct list_head free_nid_list;	/* a list for free nids */
	spinlock_t free_nid_list_lock;	/* protect free nid list */
	unsigned int fcnt;		/* the number of free node id */
	struct mutex build_lock;	/* lock for build free nids */

	/* for checkpoint */
	char *nat_bitmap;		/* NAT bitmap pointer */
	int bitmap_size;		/* bitmap size */
};

/*
 * this structure is used as one of function parameters.
 * all the information are dedicated to a given direct node block determined
 * by the data offset in a file.
 */
struct dnode_of_data {
	struct inode *inode;		/* vfs inode pointer */
	struct page *inode_page;	/* its inode page, NULL is possible */
	struct page *node_page;		/* cached direct node page */
	nid_t nid;			/* node id of the direct node block */
	unsigned int ofs_in_node;	/* data offset in the node page */
	bool inode_page_locked;		/* inode page is locked or not */
	block_t	data_blkaddr;		/* block address of the node block */
};

static inline void set_new_dnode(struct dnode_of_data *dn, struct inode *inode,
		struct page *ipage, struct page *npage, nid_t nid)
{
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	memset(dn, 0, sizeof(*dn));
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	dn->inode = inode;
	dn->inode_page = ipage;
	dn->node_page = npage;
	dn->nid = nid;
}

/*
 * For SIT manager
 *
 * By default, there are 6 active log areas across the whole main area.
 * When considering hot and cold data separation to reduce cleaning overhead,
 * we split 3 for data logs and 3 for node logs as hot, warm, and cold types,
 * respectively.
 * In the current design, you should not change the numbers intentionally.
 * Instead, as a mount option such as active_logs=x, you can use 2, 4, and 6
 * logs individually according to the underlying devices. (default: 6)
 * Just in case, on-disk layout covers maximum 16 logs that consist of 8 for
 * data and 8 for node logs.
 */
#define	NR_CURSEG_DATA_TYPE	(3)
#define NR_CURSEG_NODE_TYPE	(3)
#define NR_CURSEG_TYPE	(NR_CURSEG_DATA_TYPE + NR_CURSEG_NODE_TYPE)

enum {
	CURSEG_HOT_DATA	= 0,	/* directory entry blocks */
	CURSEG_WARM_DATA,	/* data blocks */
	CURSEG_COLD_DATA,	/* multimedia or GCed data blocks */
	CURSEG_HOT_NODE,	/* direct node blocks of directory files */
	CURSEG_WARM_NODE,	/* direct node blocks of normal files */
	CURSEG_COLD_NODE,	/* indirect node blocks */
	NO_CHECK_TYPE
};

struct f2fs_sm_info {
	struct sit_info *sit_info;		/* whole segment information */
	struct free_segmap_info *free_info;	/* free segment information */
	struct dirty_seglist_info *dirty_info;	/* dirty segment information */
	struct curseg_info *curseg_array;	/* active segment information */

	struct list_head wblist_head;	/* list of under-writeback pages */
	spinlock_t wblist_lock;		/* lock for checkpoint */

	block_t seg0_blkaddr;		/* block address of 0'th segment */
	block_t main_blkaddr;		/* start block address of main area */
	block_t ssa_blkaddr;		/* start block address of SSA area */

	unsigned int segment_count;	/* total # of segments */
	unsigned int main_segments;	/* # of segments in main area */
	unsigned int reserved_segments;	/* # of reserved segments */
	unsigned int ovp_segments;	/* # of overprovision segments */
};

/*
 * For superblock
 */
/*
 * COUNT_TYPE for monitoring
 *
 * f2fs monitors the number of several block types such as on-writeback,
 * dirty dentry blocks, dirty node blocks, and dirty meta blocks.
 */
enum count_type {
	F2FS_WRITEBACK,
	F2FS_DIRTY_DENTS,
	F2FS_DIRTY_NODES,
	F2FS_DIRTY_META,
	NR_COUNT_TYPE,
};

/*
 * The below are the page types of bios used in submti_bio().
 * The available types are:
 * DATA			User data pages. It operates as async mode.
 * NODE			Node pages. It operates as async mode.
 * META			FS metadata pages such as SIT, NAT, CP.
 * NR_PAGE_TYPE		The number of page types.
 * META_FLUSH		Make sure the previous pages are written
 *			with waiting the bio's completion
 * ...			Only can be used with META.
 */
enum page_type {
	DATA,
	NODE,
	META,
	NR_PAGE_TYPE,
	META_FLUSH,
};

struct f2fs_sb_info {
	struct super_block *sb;			/* pointer to VFS super block */
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	struct proc_dir_entry *s_proc;		/* proc entry */
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	struct buffer_head *raw_super_buf;	/* buffer head of raw sb */
	struct f2fs_super_block *raw_super;	/* raw super block pointer */
	int s_dirty;				/* dirty flag for checkpoint */

	/* for node-related operations */
	struct f2fs_nm_info *nm_info;		/* node manager */
	struct inode *node_inode;		/* cache node blocks */

	/* for segment-related operations */
	struct f2fs_sm_info *sm_info;		/* segment manager */
	struct bio *bio[NR_PAGE_TYPE];		/* bios to merge */
	sector_t last_block_in_bio[NR_PAGE_TYPE];	/* last block number */
	struct rw_semaphore bio_sem;		/* IO semaphore */

	/* for checkpoint */
	struct f2fs_checkpoint *ckpt;		/* raw checkpoint pointer */
	struct inode *meta_inode;		/* cache meta blocks */
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	struct mutex cp_mutex;			/* checkpoint procedure lock */
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	struct rw_semaphore cp_rwsem;		/* blocking FS operations */
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	struct mutex node_write;		/* locking node writes */
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	struct mutex writepages;		/* mutex for writepages() */
	int por_doing;				/* recovery is doing or not */
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	int on_build_free_nids;			/* build_free_nids is doing */
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	/* for orphan inode management */
	struct list_head orphan_inode_list;	/* orphan inode list */
	struct mutex orphan_inode_mutex;	/* for orphan inode list */
	unsigned int n_orphans;			/* # of orphan inodes */

	/* for directory inode management */
	struct list_head dir_inode_list;	/* dir inode list */
	spinlock_t dir_inode_lock;		/* for dir inode list lock */

	/* basic file system units */
	unsigned int log_sectors_per_block;	/* log2 sectors per block */
	unsigned int log_blocksize;		/* log2 block size */
	unsigned int blocksize;			/* block size */
	unsigned int root_ino_num;		/* root inode number*/
	unsigned int node_ino_num;		/* node inode number*/
	unsigned int meta_ino_num;		/* meta inode number*/
	unsigned int log_blocks_per_seg;	/* log2 blocks per segment */
	unsigned int blocks_per_seg;		/* blocks per segment */
	unsigned int segs_per_sec;		/* segments per section */
	unsigned int secs_per_zone;		/* sections per zone */
	unsigned int total_sections;		/* total section count */
	unsigned int total_node_count;		/* total node block count */
	unsigned int total_valid_node_count;	/* valid node block count */
	unsigned int total_valid_inode_count;	/* valid inode count */
	int active_logs;			/* # of active logs */

	block_t user_block_count;		/* # of user blocks */
	block_t total_valid_block_count;	/* # of valid blocks */
	block_t alloc_valid_block_count;	/* # of allocated blocks */
	block_t last_valid_block_count;		/* for recovery */
	u32 s_next_generation;			/* for NFS support */
	atomic_t nr_pages[NR_COUNT_TYPE];	/* # of pages, see count_type */

	struct f2fs_mount_info mount_opt;	/* mount options */

	/* for cleaning operations */
	struct mutex gc_mutex;			/* mutex for GC */
	struct f2fs_gc_kthread	*gc_thread;	/* GC thread */
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	unsigned int cur_victim_sec;		/* current victim section num */
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	/*
	 * for stat information.
	 * one is for the LFS mode, and the other is for the SSR mode.
	 */
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#ifdef CONFIG_F2FS_STAT_FS
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	struct f2fs_stat_info *stat_info;	/* FS status information */
	unsigned int segment_count[2];		/* # of allocated segments */
	unsigned int block_count[2];		/* # of allocated blocks */
	int total_hit_ext, read_hit_ext;	/* extent cache hit ratio */
	int bg_gc;				/* background gc calls */
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	unsigned int n_dirty_dirs;		/* # of dir inodes */
#endif
	unsigned int last_victim[2];		/* last victim segment # */
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	spinlock_t stat_lock;			/* lock for stat operations */
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	/* For sysfs suppport */
	struct kobject s_kobj;
	struct completion s_kobj_unregister;
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};

/*
 * Inline functions
 */
static inline struct f2fs_inode_info *F2FS_I(struct inode *inode)
{
	return container_of(inode, struct f2fs_inode_info, vfs_inode);
}

static inline struct f2fs_sb_info *F2FS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

static inline struct f2fs_super_block *F2FS_RAW_SUPER(struct f2fs_sb_info *sbi)
{
	return (struct f2fs_super_block *)(sbi->raw_super);
}

static inline struct f2fs_checkpoint *F2FS_CKPT(struct f2fs_sb_info *sbi)
{
	return (struct f2fs_checkpoint *)(sbi->ckpt);
}

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static inline struct f2fs_node *F2FS_NODE(struct page *page)
{
	return (struct f2fs_node *)page_address(page);
}

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static inline struct f2fs_nm_info *NM_I(struct f2fs_sb_info *sbi)
{
	return (struct f2fs_nm_info *)(sbi->nm_info);
}

static inline struct f2fs_sm_info *SM_I(struct f2fs_sb_info *sbi)
{
	return (struct f2fs_sm_info *)(sbi->sm_info);
}

static inline struct sit_info *SIT_I(struct f2fs_sb_info *sbi)
{
	return (struct sit_info *)(SM_I(sbi)->sit_info);
}

static inline struct free_segmap_info *FREE_I(struct f2fs_sb_info *sbi)
{
	return (struct free_segmap_info *)(SM_I(sbi)->free_info);
}

static inline struct dirty_seglist_info *DIRTY_I(struct f2fs_sb_info *sbi)
{
	return (struct dirty_seglist_info *)(SM_I(sbi)->dirty_info);
}

static inline void F2FS_SET_SB_DIRT(struct f2fs_sb_info *sbi)
{
	sbi->s_dirty = 1;
}

static inline void F2FS_RESET_SB_DIRT(struct f2fs_sb_info *sbi)
{
	sbi->s_dirty = 0;
}

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static inline unsigned long long cur_cp_version(struct f2fs_checkpoint *cp)
{
	return le64_to_cpu(cp->checkpoint_ver);
}

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static inline bool is_set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
{
	unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags);
	return ckpt_flags & f;
}

static inline void set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
{
	unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags);
	ckpt_flags |= f;
	cp->ckpt_flags = cpu_to_le32(ckpt_flags);
}

static inline void clear_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
{
	unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags);
	ckpt_flags &= (~f);
	cp->ckpt_flags = cpu_to_le32(ckpt_flags);
}

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static inline void f2fs_lock_op(struct f2fs_sb_info *sbi)
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{
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	down_read(&sbi->cp_rwsem);
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}

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static inline void f2fs_unlock_op(struct f2fs_sb_info *sbi)
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{
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	up_read(&sbi->cp_rwsem);
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}

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static inline void f2fs_lock_all(struct f2fs_sb_info *sbi)
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{
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	down_write_nest_lock(&sbi->cp_rwsem, &sbi->cp_mutex);
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}

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static inline void f2fs_unlock_all(struct f2fs_sb_info *sbi)
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{
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	up_write(&sbi->cp_rwsem);
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}

/*
 * Check whether the given nid is within node id range.
 */
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static inline int check_nid_range(struct f2fs_sb_info *sbi, nid_t nid)
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{
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	WARN_ON((nid >= NM_I(sbi)->max_nid));
	if (nid >= NM_I(sbi)->max_nid)
		return -EINVAL;
	return 0;
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}

#define F2FS_DEFAULT_ALLOCATED_BLOCKS	1

/*
 * Check whether the inode has blocks or not
 */
static inline int F2FS_HAS_BLOCKS(struct inode *inode)
{
	if (F2FS_I(inode)->i_xattr_nid)
		return (inode->i_blocks > F2FS_DEFAULT_ALLOCATED_BLOCKS + 1);
	else
		return (inode->i_blocks > F2FS_DEFAULT_ALLOCATED_BLOCKS);
}

static inline bool inc_valid_block_count(struct f2fs_sb_info *sbi,
				 struct inode *inode, blkcnt_t count)
{
	block_t	valid_block_count;

	spin_lock(&sbi->stat_lock);
	valid_block_count =
		sbi->total_valid_block_count + (block_t)count;
	if (valid_block_count > sbi->user_block_count) {
		spin_unlock(&sbi->stat_lock);
		return false;
	}
	inode->i_blocks += count;
	sbi->total_valid_block_count = valid_block_count;
	sbi->alloc_valid_block_count += (block_t)count;
	spin_unlock(&sbi->stat_lock);
	return true;
}

static inline int dec_valid_block_count(struct f2fs_sb_info *sbi,
						struct inode *inode,
						blkcnt_t count)
{
	spin_lock(&sbi->stat_lock);
	BUG_ON(sbi->total_valid_block_count < (block_t) count);
	BUG_ON(inode->i_blocks < count);
	inode->i_blocks -= count;
	sbi->total_valid_block_count -= (block_t)count;
	spin_unlock(&sbi->stat_lock);
	return 0;
}

static inline void inc_page_count(struct f2fs_sb_info *sbi, int count_type)
{
	atomic_inc(&sbi->nr_pages[count_type]);
	F2FS_SET_SB_DIRT(sbi);
}

static inline void inode_inc_dirty_dents(struct inode *inode)
{
	atomic_inc(&F2FS_I(inode)->dirty_dents);
}

static inline void dec_page_count(struct f2fs_sb_info *sbi, int count_type)
{
	atomic_dec(&sbi->nr_pages[count_type]);
}

static inline void inode_dec_dirty_dents(struct inode *inode)
{
	atomic_dec(&F2FS_I(inode)->dirty_dents);
}

static inline int get_pages(struct f2fs_sb_info *sbi, int count_type)
{
	return atomic_read(&sbi->nr_pages[count_type]);
}

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static inline int get_blocktype_secs(struct f2fs_sb_info *sbi, int block_type)
{
	unsigned int pages_per_sec = sbi->segs_per_sec *
					(1 << sbi->log_blocks_per_seg);
	return ((get_pages(sbi, block_type) + pages_per_sec - 1)
			>> sbi->log_blocks_per_seg) / sbi->segs_per_sec;
}

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static inline block_t valid_user_blocks(struct f2fs_sb_info *sbi)
{
	block_t ret;
	spin_lock(&sbi->stat_lock);
	ret = sbi->total_valid_block_count;
	spin_unlock(&sbi->stat_lock);
	return ret;
}

static inline unsigned long __bitmap_size(struct f2fs_sb_info *sbi, int flag)
{
	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);

	/* return NAT or SIT bitmap */
	if (flag == NAT_BITMAP)
		return le32_to_cpu(ckpt->nat_ver_bitmap_bytesize);
	else if (flag == SIT_BITMAP)
		return le32_to_cpu(ckpt->sit_ver_bitmap_bytesize);

	return 0;
}

static inline void *__bitmap_ptr(struct f2fs_sb_info *sbi, int flag)
{
	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
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	int offset = (flag == NAT_BITMAP) ?
			le32_to_cpu(ckpt->sit_ver_bitmap_bytesize) : 0;
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	return &ckpt->sit_nat_version_bitmap + offset;
}

static inline block_t __start_cp_addr(struct f2fs_sb_info *sbi)
{
	block_t start_addr;
	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
658
	unsigned long long ckpt_version = cur_cp_version(ckpt);
659

660
	start_addr = le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_blkaddr);
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	/*
	 * odd numbered checkpoint should at cp segment 0
	 * and even segent must be at cp segment 1
	 */
	if (!(ckpt_version & 1))
		start_addr += sbi->blocks_per_seg;

	return start_addr;
}

static inline block_t __start_sum_addr(struct f2fs_sb_info *sbi)
{
	return le32_to_cpu(F2FS_CKPT(sbi)->cp_pack_start_sum);
}

static inline bool inc_valid_node_count(struct f2fs_sb_info *sbi,
						struct inode *inode,
						unsigned int count)
{
	block_t	valid_block_count;
	unsigned int valid_node_count;

	spin_lock(&sbi->stat_lock);

	valid_block_count = sbi->total_valid_block_count + (block_t)count;
	sbi->alloc_valid_block_count += (block_t)count;
	valid_node_count = sbi->total_valid_node_count + count;

	if (valid_block_count > sbi->user_block_count) {
		spin_unlock(&sbi->stat_lock);
		return false;
	}

	if (valid_node_count > sbi->total_node_count) {
		spin_unlock(&sbi->stat_lock);
		return false;
	}

	if (inode)
		inode->i_blocks += count;
	sbi->total_valid_node_count = valid_node_count;
	sbi->total_valid_block_count = valid_block_count;
	spin_unlock(&sbi->stat_lock);

	return true;
}

static inline void dec_valid_node_count(struct f2fs_sb_info *sbi,
						struct inode *inode,
						unsigned int count)
{
	spin_lock(&sbi->stat_lock);

	BUG_ON(sbi->total_valid_block_count < count);
	BUG_ON(sbi->total_valid_node_count < count);
	BUG_ON(inode->i_blocks < count);

	inode->i_blocks -= count;
	sbi->total_valid_node_count -= count;
	sbi->total_valid_block_count -= (block_t)count;

	spin_unlock(&sbi->stat_lock);
}

static inline unsigned int valid_node_count(struct f2fs_sb_info *sbi)
{
	unsigned int ret;
	spin_lock(&sbi->stat_lock);
	ret = sbi->total_valid_node_count;
	spin_unlock(&sbi->stat_lock);
	return ret;
}

static inline void inc_valid_inode_count(struct f2fs_sb_info *sbi)
{
	spin_lock(&sbi->stat_lock);
	BUG_ON(sbi->total_valid_inode_count == sbi->total_node_count);
	sbi->total_valid_inode_count++;
	spin_unlock(&sbi->stat_lock);
}

static inline int dec_valid_inode_count(struct f2fs_sb_info *sbi)
{
	spin_lock(&sbi->stat_lock);
	BUG_ON(!sbi->total_valid_inode_count);
	sbi->total_valid_inode_count--;
	spin_unlock(&sbi->stat_lock);
	return 0;
}

static inline unsigned int valid_inode_count(struct f2fs_sb_info *sbi)
{
	unsigned int ret;
	spin_lock(&sbi->stat_lock);
	ret = sbi->total_valid_inode_count;
	spin_unlock(&sbi->stat_lock);
	return ret;
}

static inline void f2fs_put_page(struct page *page, int unlock)
{
	if (!page || IS_ERR(page))
		return;

	if (unlock) {
		BUG_ON(!PageLocked(page));
		unlock_page(page);
	}
	page_cache_release(page);
}

static inline void f2fs_put_dnode(struct dnode_of_data *dn)
{
	if (dn->node_page)
		f2fs_put_page(dn->node_page, 1);
	if (dn->inode_page && dn->node_page != dn->inode_page)
		f2fs_put_page(dn->inode_page, 0);
	dn->node_page = NULL;
	dn->inode_page = NULL;
}

static inline struct kmem_cache *f2fs_kmem_cache_create(const char *name,
					size_t size, void (*ctor)(void *))
{
	return kmem_cache_create(name, size, 0, SLAB_RECLAIM_ACCOUNT, ctor);
}

#define RAW_IS_INODE(p)	((p)->footer.nid == (p)->footer.ino)

static inline bool IS_INODE(struct page *page)
{
793
	struct f2fs_node *p = F2FS_NODE(page);
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	return RAW_IS_INODE(p);
}

static inline __le32 *blkaddr_in_node(struct f2fs_node *node)
{
	return RAW_IS_INODE(node) ? node->i.i_addr : node->dn.addr;
}

static inline block_t datablock_addr(struct page *node_page,
		unsigned int offset)
{
	struct f2fs_node *raw_node;
	__le32 *addr_array;
807
	raw_node = F2FS_NODE(node_page);
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	addr_array = blkaddr_in_node(raw_node);
	return le32_to_cpu(addr_array[offset]);
}

static inline int f2fs_test_bit(unsigned int nr, char *addr)
{
	int mask;

	addr += (nr >> 3);
	mask = 1 << (7 - (nr & 0x07));
	return mask & *addr;
}

static inline int f2fs_set_bit(unsigned int nr, char *addr)
{
	int mask;
	int ret;

	addr += (nr >> 3);
	mask = 1 << (7 - (nr & 0x07));
	ret = mask & *addr;
	*addr |= mask;
	return ret;
}

static inline int f2fs_clear_bit(unsigned int nr, char *addr)
{
	int mask;
	int ret;

	addr += (nr >> 3);
	mask = 1 << (7 - (nr & 0x07));
	ret = mask & *addr;
	*addr &= ~mask;
	return ret;
}

/* used for f2fs_inode_info->flags */
enum {
	FI_NEW_INODE,		/* indicate newly allocated inode */
848
	FI_DIRTY_INODE,		/* indicate inode is dirty or not */
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	FI_INC_LINK,		/* need to increment i_nlink */
	FI_ACL_MODE,		/* indicate acl mode */
	FI_NO_ALLOC,		/* should not allocate any blocks */
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	FI_UPDATE_DIR,		/* should update inode block for consistency */
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	FI_DELAY_IPUT,		/* used for the recovery */
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	FI_INLINE_XATTR,	/* used for inline xattr */
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};

static inline void set_inode_flag(struct f2fs_inode_info *fi, int flag)
{
	set_bit(flag, &fi->flags);
}

static inline int is_inode_flag_set(struct f2fs_inode_info *fi, int flag)
{
	return test_bit(flag, &fi->flags);
}

static inline void clear_inode_flag(struct f2fs_inode_info *fi, int flag)
{
	clear_bit(flag, &fi->flags);
}

static inline void set_acl_inode(struct f2fs_inode_info *fi, umode_t mode)
{
	fi->i_acl_mode = mode;
	set_inode_flag(fi, FI_ACL_MODE);
}

static inline int cond_clear_inode_flag(struct f2fs_inode_info *fi, int flag)
{
	if (is_inode_flag_set(fi, FI_ACL_MODE)) {
		clear_inode_flag(fi, FI_ACL_MODE);
		return 1;
	}
	return 0;
}

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static inline void get_inline_info(struct f2fs_inode_info *fi,
					struct f2fs_inode *ri)
{
	if (ri->i_inline & F2FS_INLINE_XATTR)
		set_inode_flag(fi, FI_INLINE_XATTR);
}

static inline void set_raw_inline(struct f2fs_inode_info *fi,
					struct f2fs_inode *ri)
{
	ri->i_inline = 0;

	if (is_inode_flag_set(fi, FI_INLINE_XATTR))
		ri->i_inline |= F2FS_INLINE_XATTR;
}

903 904 905 906 907 908 909
static inline unsigned int addrs_per_inode(struct f2fs_inode_info *fi)
{
	if (is_inode_flag_set(fi, FI_INLINE_XATTR))
		return DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS;
	return DEF_ADDRS_PER_INODE;
}

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static inline void *inline_xattr_addr(struct page *page)
{
	struct f2fs_inode *ri;
	ri = (struct f2fs_inode *)page_address(page);
	return (void *)&(ri->i_addr[DEF_ADDRS_PER_INODE -
					F2FS_INLINE_XATTR_ADDRS]);
}

static inline int inline_xattr_size(struct inode *inode)
{
	if (is_inode_flag_set(F2FS_I(inode), FI_INLINE_XATTR))
		return F2FS_INLINE_XATTR_ADDRS << 2;
	else
		return 0;
}

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static inline int f2fs_readonly(struct super_block *sb)
{
	return sb->s_flags & MS_RDONLY;
}

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/*
 * file.c
 */
int f2fs_sync_file(struct file *, loff_t, loff_t, int);
void truncate_data_blocks(struct dnode_of_data *);
void f2fs_truncate(struct inode *);
937
int f2fs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
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int f2fs_setattr(struct dentry *, struct iattr *);
int truncate_hole(struct inode *, pgoff_t, pgoff_t);
940
int truncate_data_blocks_range(struct dnode_of_data *, int);
941
long f2fs_ioctl(struct file *, unsigned int, unsigned long);
942
long f2fs_compat_ioctl(struct file *, unsigned int, unsigned long);
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/*
 * inode.c
 */
void f2fs_set_inode_flags(struct inode *);
struct inode *f2fs_iget(struct super_block *, unsigned long);
void update_inode(struct inode *, struct page *);
950
int update_inode_page(struct inode *);
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int f2fs_write_inode(struct inode *, struct writeback_control *);
void f2fs_evict_inode(struct inode *);

/*
 * namei.c
 */
struct dentry *f2fs_get_parent(struct dentry *child);

/*
 * dir.c
 */
struct f2fs_dir_entry *f2fs_find_entry(struct inode *, struct qstr *,
							struct page **);
struct f2fs_dir_entry *f2fs_parent_dir(struct inode *, struct page **);
ino_t f2fs_inode_by_name(struct inode *, struct qstr *);
void f2fs_set_link(struct inode *, struct f2fs_dir_entry *,
				struct page *, struct inode *);
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int update_dent_inode(struct inode *, const struct qstr *);
969
int __f2fs_add_link(struct inode *, const struct qstr *, struct inode *);
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void f2fs_delete_entry(struct f2fs_dir_entry *, struct page *, struct inode *);
int f2fs_make_empty(struct inode *, struct inode *);
bool f2fs_empty_dir(struct inode *);

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static inline int f2fs_add_link(struct dentry *dentry, struct inode *inode)
{
	return __f2fs_add_link(dentry->d_parent->d_inode, &dentry->d_name,
				inode);
}

980 981 982 983
/*
 * super.c
 */
int f2fs_sync_fs(struct super_block *, int);
984 985
extern __printf(3, 4)
void f2fs_msg(struct super_block *, const char *, const char *, ...);
986 987 988 989

/*
 * hash.c
 */
990
f2fs_hash_t f2fs_dentry_hash(const char *, size_t);
991 992 993 994 995 996 997 998 999 1000 1001

/*
 * node.c
 */
struct dnode_of_data;
struct node_info;

int is_checkpointed_node(struct f2fs_sb_info *, nid_t);
void get_node_info(struct f2fs_sb_info *, nid_t, struct node_info *);
int get_dnode_of_data(struct dnode_of_data *, pgoff_t, int);
int truncate_inode_blocks(struct inode *, pgoff_t);
1002
int truncate_xattr_node(struct inode *, struct page *);
1003
int remove_inode_page(struct inode *);
1004
struct page *new_inode_page(struct inode *, const struct qstr *);
1005
struct page *new_node_page(struct dnode_of_data *, unsigned int, struct page *);
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
void ra_node_page(struct f2fs_sb_info *, nid_t);
struct page *get_node_page(struct f2fs_sb_info *, pgoff_t);
struct page *get_node_page_ra(struct page *, int);
void sync_inode_page(struct dnode_of_data *);
int sync_node_pages(struct f2fs_sb_info *, nid_t, struct writeback_control *);
bool alloc_nid(struct f2fs_sb_info *, nid_t *);
void alloc_nid_done(struct f2fs_sb_info *, nid_t);
void alloc_nid_failed(struct f2fs_sb_info *, nid_t);
void recover_node_page(struct f2fs_sb_info *, struct page *,
		struct f2fs_summary *, struct node_info *, block_t);
int recover_inode_page(struct f2fs_sb_info *, struct page *);
int restore_node_summary(struct f2fs_sb_info *, unsigned int,
				struct f2fs_summary_block *);
void flush_nat_entries(struct f2fs_sb_info *);
int build_node_manager(struct f2fs_sb_info *);
void destroy_node_manager(struct f2fs_sb_info *);
1022
int __init create_node_manager_caches(void);
1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
void destroy_node_manager_caches(void);

/*
 * segment.c
 */
void f2fs_balance_fs(struct f2fs_sb_info *);
void invalidate_blocks(struct f2fs_sb_info *, block_t);
void clear_prefree_segments(struct f2fs_sb_info *);
int npages_for_summary_flush(struct f2fs_sb_info *);
void allocate_new_segments(struct f2fs_sb_info *);
struct page *get_sum_page(struct f2fs_sb_info *, unsigned int);
1034
struct bio *f2fs_bio_alloc(struct block_device *, int);
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void f2fs_submit_bio(struct f2fs_sb_info *, enum page_type, bool);
void f2fs_wait_on_page_writeback(struct page *, enum page_type, bool);
1037
void write_meta_page(struct f2fs_sb_info *, struct page *);
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
void write_node_page(struct f2fs_sb_info *, struct page *, unsigned int,
					block_t, block_t *);
void write_data_page(struct inode *, struct page *, struct dnode_of_data*,
					block_t, block_t *);
void rewrite_data_page(struct f2fs_sb_info *, struct page *, block_t);
void recover_data_page(struct f2fs_sb_info *, struct page *,
				struct f2fs_summary *, block_t, block_t);
void rewrite_node_page(struct f2fs_sb_info *, struct page *,
				struct f2fs_summary *, block_t, block_t);
void write_data_summaries(struct f2fs_sb_info *, block_t);
void write_node_summaries(struct f2fs_sb_info *, block_t);
int lookup_journal_in_cursum(struct f2fs_summary_block *,
					int, unsigned int, int);
void flush_sit_entries(struct f2fs_sb_info *);
int build_segment_manager(struct f2fs_sb_info *);
void destroy_segment_manager(struct f2fs_sb_info *);

/*
 * checkpoint.c
 */
struct page *grab_meta_page(struct f2fs_sb_info *, pgoff_t);
struct page *get_meta_page(struct f2fs_sb_info *, pgoff_t);
long sync_meta_pages(struct f2fs_sb_info *, enum page_type, long);
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int acquire_orphan_inode(struct f2fs_sb_info *);
void release_orphan_inode(struct f2fs_sb_info *);
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void add_orphan_inode(struct f2fs_sb_info *, nid_t);
void remove_orphan_inode(struct f2fs_sb_info *, nid_t);
int recover_orphan_inodes(struct f2fs_sb_info *);
int get_valid_checkpoint(struct f2fs_sb_info *);
void set_dirty_dir_page(struct inode *, struct page *);
1068
void add_dirty_dir_inode(struct inode *);
1069
void remove_dirty_dir_inode(struct inode *);
1070
struct inode *check_dirty_dir_inode(struct f2fs_sb_info *, nid_t);
1071
void sync_dirty_dir_inodes(struct f2fs_sb_info *);
1072
void write_checkpoint(struct f2fs_sb_info *, bool);
1073
void init_orphan_info(struct f2fs_sb_info *);
1074
int __init create_checkpoint_caches(void);
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void destroy_checkpoint_caches(void);

/*
 * data.c
 */
int reserve_new_block(struct dnode_of_data *);
void update_extent_cache(block_t, struct dnode_of_data *);
1082
struct page *find_data_page(struct inode *, pgoff_t, bool);
1083
struct page *get_lock_data_page(struct inode *, pgoff_t);
1084
struct page *get_new_data_page(struct inode *, struct page *, pgoff_t, bool);
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int f2fs_readpage(struct f2fs_sb_info *, struct page *, block_t, int);
int do_write_data_page(struct page *);

/*
 * gc.c
 */
int start_gc_thread(struct f2fs_sb_info *);
void stop_gc_thread(struct f2fs_sb_info *);
1093
block_t start_bidx_of_node(unsigned int, struct f2fs_inode_info *);
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int f2fs_gc(struct f2fs_sb_info *);
1095
void build_gc_manager(struct f2fs_sb_info *);
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int __init create_gc_caches(void);
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void destroy_gc_caches(void);

/*
 * recovery.c
 */
1102
int recover_fsync_data(struct f2fs_sb_info *);
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136
bool space_for_roll_forward(struct f2fs_sb_info *);

/*
 * debug.c
 */
#ifdef CONFIG_F2FS_STAT_FS
struct f2fs_stat_info {
	struct list_head stat_list;
	struct f2fs_sb_info *sbi;
	struct mutex stat_lock;
	int all_area_segs, sit_area_segs, nat_area_segs, ssa_area_segs;
	int main_area_segs, main_area_sections, main_area_zones;
	int hit_ext, total_ext;
	int ndirty_node, ndirty_dent, ndirty_dirs, ndirty_meta;
	int nats, sits, fnids;
	int total_count, utilization;
	int bg_gc;
	unsigned int valid_count, valid_node_count, valid_inode_count;
	unsigned int bimodal, avg_vblocks;
	int util_free, util_valid, util_invalid;
	int rsvd_segs, overp_segs;
	int dirty_count, node_pages, meta_pages;
	int prefree_count, call_count;
	int tot_segs, node_segs, data_segs, free_segs, free_secs;
	int tot_blks, data_blks, node_blks;
	int curseg[NR_CURSEG_TYPE];
	int cursec[NR_CURSEG_TYPE];
	int curzone[NR_CURSEG_TYPE];

	unsigned int segment_count[2];
	unsigned int block_count[2];
	unsigned base_mem, cache_mem;
};

1137 1138 1139 1140 1141
static inline struct f2fs_stat_info *F2FS_STAT(struct f2fs_sb_info *sbi)
{
	return (struct f2fs_stat_info*)sbi->stat_info;
}

1142 1143 1144 1145
#define stat_inc_call_count(si)	((si)->call_count++)

#define stat_inc_seg_count(sbi, type)					\
	do {								\
1146
		struct f2fs_stat_info *si = F2FS_STAT(sbi);		\
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158
		(si)->tot_segs++;					\
		if (type == SUM_TYPE_DATA)				\
			si->data_segs++;				\
		else							\
			si->node_segs++;				\
	} while (0)

#define stat_inc_tot_blk_count(si, blks)				\
	(si->tot_blks += (blks))

#define stat_inc_data_blk_count(sbi, blks)				\
	do {								\
1159
		struct f2fs_stat_info *si = F2FS_STAT(sbi);		\
1160 1161 1162 1163 1164 1165
		stat_inc_tot_blk_count(si, blks);			\
		si->data_blks += (blks);				\
	} while (0)

#define stat_inc_node_blk_count(sbi, blks)				\
	do {								\
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		struct f2fs_stat_info *si = F2FS_STAT(sbi);		\
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		stat_inc_tot_blk_count(si, blks);			\
		si->node_blks += (blks);				\
	} while (0)

int f2fs_build_stats(struct f2fs_sb_info *);
void f2fs_destroy_stats(struct f2fs_sb_info *);
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void __init f2fs_create_root_stats(void);
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void f2fs_destroy_root_stats(void);
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#else
#define stat_inc_call_count(si)
#define stat_inc_seg_count(si, type)
#define stat_inc_tot_blk_count(si, blks)
#define stat_inc_data_blk_count(si, blks)
#define stat_inc_node_blk_count(sbi, blks)

static inline int f2fs_build_stats(struct f2fs_sb_info *sbi) { return 0; }
static inline void f2fs_destroy_stats(struct f2fs_sb_info *sbi) { }
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static inline void __init f2fs_create_root_stats(void) { }
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static inline void f2fs_destroy_root_stats(void) { }
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#endif

extern const struct file_operations f2fs_dir_operations;
extern const struct file_operations f2fs_file_operations;
extern const struct inode_operations f2fs_file_inode_operations;
extern const struct address_space_operations f2fs_dblock_aops;
extern const struct address_space_operations f2fs_node_aops;
extern const struct address_space_operations f2fs_meta_aops;
extern const struct inode_operations f2fs_dir_inode_operations;
extern const struct inode_operations f2fs_symlink_inode_operations;
extern const struct inode_operations f2fs_special_inode_operations;
#endif