[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / fs / affs / affs.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifdef pr_fmt
#undef pr_fmt
#endif

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/types.h>
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include "amigaffs.h"
#include <linux/mutex.h>
#include <linux/workqueue.h>

/* Ugly macros make the code more pretty. */

#define GET_END_PTR(st,p,sz)		 ((st *)((char *)(p)+((sz)-sizeof(st))))
#define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
#define AFFS_BLOCK(sb, bh, blk)		(AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])

#define AFFS_HEAD(bh)		((struct affs_head *)(bh)->b_data)
#define AFFS_TAIL(sb, bh)	((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
#define AFFS_ROOT_HEAD(bh)	((struct affs_root_head *)(bh)->b_data)
#define AFFS_ROOT_TAIL(sb, bh)	((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
#define AFFS_DATA_HEAD(bh)	((struct affs_data_head *)(bh)->b_data)
#define AFFS_DATA(bh)		(((struct affs_data_head *)(bh)->b_data)->data)

#define AFFS_CACHE_SIZE		PAGE_SIZE

#define AFFS_LC_SIZE		(AFFS_CACHE_SIZE/sizeof(u32)/2)
#define AFFS_AC_SIZE		(AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
#define AFFS_AC_MASK		(AFFS_AC_SIZE-1)

#define AFFSNAMEMAX 30U

struct affs_ext_key {
	u32	ext;				/* idx of the extended block */
	u32	key;				/* block number */
};

/*
 * affs fs inode data in memory
 */
struct affs_inode_info {
	atomic_t i_opencnt;
	struct semaphore i_link_lock;		/* Protects internal inode access. */
	struct semaphore i_ext_lock;		/* Protects internal inode access. */
#define i_hash_lock i_ext_lock
	u32	 i_blkcnt;			/* block count */
	u32	 i_extcnt;			/* extended block count */
	u32	*i_lc;				/* linear cache of extended blocks */
	u32	 i_lc_size;
	u32	 i_lc_shift;
	u32	 i_lc_mask;
	struct affs_ext_key *i_ac;		/* associative cache of extended blocks */
	u32	 i_ext_last;			/* last accessed extended block */
	struct buffer_head *i_ext_bh;		/* bh of last extended block */
	loff_t	 mmu_private;
	u32	 i_protect;			/* unused attribute bits */
	u32	 i_lastalloc;			/* last allocated block */
	int	 i_pa_cnt;			/* number of preallocated blocks */
	struct inode vfs_inode;
};

/* short cut to get to the affs specific inode data */
static inline struct affs_inode_info *AFFS_I(struct inode *inode)
{
	return container_of(inode, struct affs_inode_info, vfs_inode);
}

/*
 * super-block data in memory
 *
 * Block numbers are adjusted for their actual size
 *
 */

struct affs_bm_info {
	u32 bm_key;			/* Disk block number */
	u32 bm_free;			/* Free blocks in here */
};

struct affs_sb_info {
	int s_partition_size;		/* Partition size in blocks. */
	int s_reserved;			/* Number of reserved blocks. */
	//u32 s_blksize;			/* Initial device blksize */
	u32 s_data_blksize;		/* size of the data block w/o header */
	u32 s_root_block;		/* FFS root block number. */
	int s_hashsize;			/* Size of hash table. */
	unsigned long s_flags;		/* See below. */
	kuid_t s_uid;			/* uid to override */
	kgid_t s_gid;			/* gid to override */
	umode_t s_mode;			/* mode to override */
	struct buffer_head *s_root_bh;	/* Cached root block. */
	struct mutex s_bmlock;		/* Protects bitmap access. */
	struct affs_bm_info *s_bitmap;	/* Bitmap infos. */
	u32 s_bmap_count;		/* # of bitmap blocks. */
	u32 s_bmap_bits;		/* # of bits in one bitmap blocks */
	u32 s_last_bmap;
	struct buffer_head *s_bmap_bh;
	char *s_prefix;			/* Prefix for volumes and assigns. */
	char s_volume[32];		/* Volume prefix for absolute symlinks. */
	spinlock_t symlink_lock;	/* protects the previous two */
	struct super_block *sb;		/* the VFS superblock object */
	int work_queued;		/* non-zero delayed work is queued */
	struct delayed_work sb_work;	/* superblock flush delayed work */
	spinlock_t work_lock;		/* protects sb_work and work_queued */
};

#define AFFS_MOUNT_SF_INTL		0x0001 /* International filesystem. */
#define AFFS_MOUNT_SF_BM_VALID		0x0002 /* Bitmap is valid. */
#define AFFS_MOUNT_SF_IMMUTABLE		0x0004 /* Protection bits cannot be changed */
#define AFFS_MOUNT_SF_QUIET		0x0008 /* chmod errors will be not reported */
#define AFFS_MOUNT_SF_SETUID		0x0010 /* Ignore Amiga uid */
#define AFFS_MOUNT_SF_SETGID		0x0020 /* Ignore Amiga gid */
#define AFFS_MOUNT_SF_SETMODE		0x0040 /* Ignore Amiga protection bits */
#define AFFS_MOUNT_SF_MUFS		0x0100 /* Use MUFS uid/gid mapping */
#define AFFS_MOUNT_SF_OFS		0x0200 /* Old filesystem */
#define AFFS_MOUNT_SF_PREFIX		0x0400 /* Buffer for prefix is allocated */
#define AFFS_MOUNT_SF_VERBOSE		0x0800 /* Talk about fs when mounting */
#define AFFS_MOUNT_SF_NO_TRUNCATE	0x1000 /* Don't truncate filenames */

#define affs_clear_opt(o, opt)    (o &= ~AFFS_MOUNT_##opt)
#define affs_set_opt(o, opt)      (o |= AFFS_MOUNT_##opt)
#define affs_test_opt(o, opt)     ((o) & AFFS_MOUNT_##opt)

/* short cut to get to the affs specific sb data */
static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

void affs_mark_sb_dirty(struct super_block *sb);

/* amigaffs.c */

extern int	affs_insert_hash(struct inode *inode, struct buffer_head *bh);
extern int	affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
extern int	affs_remove_header(struct dentry *dentry);
extern u32	affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
extern void	affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
extern void	affs_secs_to_datestamp(time64_t secs, struct affs_date *ds);
extern umode_t	affs_prot_to_mode(u32 prot);
extern void	affs_mode_to_prot(struct inode *inode);
__printf(3, 4)
extern void	affs_error(struct super_block *sb, const char *function,
			   const char *fmt, ...);
__printf(3, 4)
extern void	affs_warning(struct super_block *sb, const char *function,
			     const char *fmt, ...);
extern bool	affs_nofilenametruncate(const struct dentry *dentry);
extern int	affs_check_name(const unsigned char *name, int len,
				bool notruncate);
extern int	affs_copy_name(unsigned char *bstr, struct dentry *dentry);

/* bitmap. c */

extern u32	affs_count_free_blocks(struct super_block *s);
extern void	affs_free_block(struct super_block *sb, u32 block);
extern u32	affs_alloc_block(struct inode *inode, u32 goal);
extern int	affs_init_bitmap(struct super_block *sb, int *flags);
extern void	affs_free_bitmap(struct super_block *sb);

/* namei.c */

extern const struct export_operations affs_export_ops;
extern int	affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);
extern int	affs_unlink(struct inode *dir, struct dentry *dentry);
extern int	affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool);
extern int	affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
extern int	affs_rmdir(struct inode *dir, struct dentry *dentry);
extern int	affs_link(struct dentry *olddentry, struct inode *dir,
			  struct dentry *dentry);
extern int	affs_symlink(struct inode *dir, struct dentry *dentry,
			     const char *symname);
extern int	affs_rename2(struct inode *old_dir, struct dentry *old_dentry,
			    struct inode *new_dir, struct dentry *new_dentry,
			    unsigned int flags);

/* inode.c */

extern struct inode		*affs_new_inode(struct inode *dir);
extern int			 affs_notify_change(struct dentry *dentry, struct iattr *attr);
extern void			 affs_evict_inode(struct inode *inode);
extern struct inode		*affs_iget(struct super_block *sb,
					unsigned long ino);
extern int			 affs_write_inode(struct inode *inode,
					struct writeback_control *wbc);
extern int			 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);

/* file.c */

void		affs_free_prealloc(struct inode *inode);
extern void	affs_truncate(struct inode *);
int		affs_file_fsync(struct file *, loff_t, loff_t, int);

/* dir.c */

extern void   affs_dir_truncate(struct inode *);

/* jump tables */

extern const struct inode_operations	 affs_file_inode_operations;
extern const struct inode_operations	 affs_dir_inode_operations;
extern const struct inode_operations   affs_symlink_inode_operations;
extern const struct file_operations	 affs_file_operations;
extern const struct file_operations	 affs_file_operations_ofs;
extern const struct file_operations	 affs_dir_operations;
extern const struct address_space_operations	 affs_symlink_aops;
extern const struct address_space_operations	 affs_aops;
extern const struct address_space_operations	 affs_aops_ofs;

extern const struct dentry_operations	 affs_dentry_operations;
extern const struct dentry_operations	 affs_intl_dentry_operations;

static inline bool affs_validblock(struct super_block *sb, int block)
{
	return(block >= AFFS_SB(sb)->s_reserved &&
	       block < AFFS_SB(sb)->s_partition_size);
}

static inline void
affs_set_blocksize(struct super_block *sb, int size)
{
	sb_set_blocksize(sb, size);
}
static inline struct buffer_head *
affs_bread(struct super_block *sb, int block)
{
	pr_debug("%s: %d\n", __func__, block);
	if (affs_validblock(sb, block))
		return sb_bread(sb, block);
	return NULL;
}
static inline struct buffer_head *
affs_getblk(struct super_block *sb, int block)
{
	pr_debug("%s: %d\n", __func__, block);
	if (affs_validblock(sb, block))
		return sb_getblk(sb, block);
	return NULL;
}
static inline struct buffer_head *
affs_getzeroblk(struct super_block *sb, int block)
{
	struct buffer_head *bh;
	pr_debug("%s: %d\n", __func__, block);
	if (affs_validblock(sb, block)) {
		bh = sb_getblk(sb, block);
		lock_buffer(bh);
		memset(bh->b_data, 0 , sb->s_blocksize);
		set_buffer_uptodate(bh);
		unlock_buffer(bh);
		return bh;
	}
	return NULL;
}
static inline struct buffer_head *
affs_getemptyblk(struct super_block *sb, int block)
{
	struct buffer_head *bh;
	pr_debug("%s: %d\n", __func__, block);
	if (affs_validblock(sb, block)) {
		bh = sb_getblk(sb, block);
		wait_on_buffer(bh);
		set_buffer_uptodate(bh);
		return bh;
	}
	return NULL;
}
static inline void
affs_brelse(struct buffer_head *bh)
{
	if (bh)
		pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr);
	brelse(bh);
}

static inline void
affs_adjust_checksum(struct buffer_head *bh, u32 val)
{
	u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
	((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
}
static inline void
affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
{
	u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
	((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
}

static inline void
affs_lock_link(struct inode *inode)
{
	down(&AFFS_I(inode)->i_link_lock);
}
static inline void
affs_unlock_link(struct inode *inode)
{
	up(&AFFS_I(inode)->i_link_lock);
}
static inline void
affs_lock_dir(struct inode *inode)
{
	down(&AFFS_I(inode)->i_hash_lock);
}
static inline void
affs_unlock_dir(struct inode *inode)
{
	up(&AFFS_I(inode)->i_hash_lock);
}
static inline void
affs_lock_ext(struct inode *inode)
{
	down(&AFFS_I(inode)->i_ext_lock);
}
static inline void
affs_unlock_ext(struct inode *inode)
{
	up(&AFFS_I(inode)->i_ext_lock);
}
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifdef pr_fmt
	3	#undef pr_fmt
	4	#endif
	5
	6	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	7
	8	#include <linux/types.h>
	9	#include <linux/fs.h>
	10	#include <linux/buffer_head.h>
	11	#include "amigaffs.h"
	12	#include <linux/mutex.h>
	13	#include <linux/workqueue.h>
	14
	15	/* Ugly macros make the code more pretty. */
	16
	17	#define GET_END_PTR(st,p,sz) ((st )((char )(p)+((sz)-sizeof(st))))
	18	#define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
	19	#define AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
	20
	21	#define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data)
	22	#define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
	23	#define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data)
	24	#define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
	25	#define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data)
	26	#define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data)
	27
	28	#define AFFS_CACHE_SIZE PAGE_SIZE
	29
	30	#define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2)
	31	#define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
	32	#define AFFS_AC_MASK (AFFS_AC_SIZE-1)
	33
	34	#define AFFSNAMEMAX 30U
	35
	36	struct affs_ext_key {
	37	u32 ext; /* idx of the extended block */
	38	u32 key; /* block number */
	39	};
	40
	41	/*
	42	* affs fs inode data in memory
	43	*/
	44	struct affs_inode_info {
	45	atomic_t i_opencnt;
	46	struct semaphore i_link_lock; /* Protects internal inode access. */
	47	struct semaphore i_ext_lock; /* Protects internal inode access. */
	48	#define i_hash_lock i_ext_lock
	49	u32 i_blkcnt; /* block count */
	50	u32 i_extcnt; /* extended block count */
	51	u32 i_lc; / linear cache of extended blocks */
	52	u32 i_lc_size;
	53	u32 i_lc_shift;
	54	u32 i_lc_mask;
	55	struct affs_ext_key i_ac; / associative cache of extended blocks */
	56	u32 i_ext_last; /* last accessed extended block */
	57	struct buffer_head i_ext_bh; / bh of last extended block */
	58	loff_t mmu_private;
	59	u32 i_protect; /* unused attribute bits */
	60	u32 i_lastalloc; /* last allocated block */
	61	int i_pa_cnt; /* number of preallocated blocks */
	62	struct inode vfs_inode;
	63	};
	64
	65	/* short cut to get to the affs specific inode data */
	66	static inline struct affs_inode_info AFFS_I(struct inode inode)
	67	{
	68	return container_of(inode, struct affs_inode_info, vfs_inode);
	69	}
	70
	71	/*
	72	* super-block data in memory
	73	*
	74	* Block numbers are adjusted for their actual size
	75	*
	76	*/
	77
	78	struct affs_bm_info {
	79	u32 bm_key; /* Disk block number */
	80	u32 bm_free; /* Free blocks in here */
	81	};
	82
	83	struct affs_sb_info {
	84	int s_partition_size; /* Partition size in blocks. */
	85	int s_reserved; /* Number of reserved blocks. */
	86	//u32 s_blksize; /* Initial device blksize */
	87	u32 s_data_blksize; /* size of the data block w/o header */
	88	u32 s_root_block; /* FFS root block number. */
	89	int s_hashsize; /* Size of hash table. */
	90	unsigned long s_flags; /* See below. */
	91	kuid_t s_uid; /* uid to override */
	92	kgid_t s_gid; /* gid to override */
	93	umode_t s_mode; /* mode to override */
	94	struct buffer_head s_root_bh; / Cached root block. */
	95	struct mutex s_bmlock; /* Protects bitmap access. */
	96	struct affs_bm_info s_bitmap; / Bitmap infos. */
	97	u32 s_bmap_count; /* # of bitmap blocks. */
	98	u32 s_bmap_bits; /* # of bits in one bitmap blocks */
	99	u32 s_last_bmap;
	100	struct buffer_head *s_bmap_bh;
	101	char s_prefix; / Prefix for volumes and assigns. */
	102	char s_volume[32]; /* Volume prefix for absolute symlinks. */
	103	spinlock_t symlink_lock; /* protects the previous two */
	104	struct super_block sb; / the VFS superblock object */
	105	int work_queued; /* non-zero delayed work is queued */
	106	struct delayed_work sb_work; /* superblock flush delayed work */
	107	spinlock_t work_lock; /* protects sb_work and work_queued */
	108	};
	109
	110	#define AFFS_MOUNT_SF_INTL 0x0001 /* International filesystem. */
	111	#define AFFS_MOUNT_SF_BM_VALID 0x0002 /* Bitmap is valid. */
	112	#define AFFS_MOUNT_SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */
	113	#define AFFS_MOUNT_SF_QUIET 0x0008 /* chmod errors will be not reported */
	114	#define AFFS_MOUNT_SF_SETUID 0x0010 /* Ignore Amiga uid */
	115	#define AFFS_MOUNT_SF_SETGID 0x0020 /* Ignore Amiga gid */
	116	#define AFFS_MOUNT_SF_SETMODE 0x0040 /* Ignore Amiga protection bits */
	117	#define AFFS_MOUNT_SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */
	118	#define AFFS_MOUNT_SF_OFS 0x0200 /* Old filesystem */
	119	#define AFFS_MOUNT_SF_PREFIX 0x0400 /* Buffer for prefix is allocated */
	120	#define AFFS_MOUNT_SF_VERBOSE 0x0800 /* Talk about fs when mounting */
	121	#define AFFS_MOUNT_SF_NO_TRUNCATE 0x1000 /* Don't truncate filenames */
	122
	123	#define affs_clear_opt(o, opt) (o &= ~AFFS_MOUNT_##opt)
	124	#define affs_set_opt(o, opt) (o \|= AFFS_MOUNT_##opt)
	125	#define affs_test_opt(o, opt) ((o) & AFFS_MOUNT_##opt)
	126
	127	/* short cut to get to the affs specific sb data */
	128	static inline struct affs_sb_info AFFS_SB(struct super_block sb)
	129	{
	130	return sb->s_fs_info;
	131	}
	132
	133	void affs_mark_sb_dirty(struct super_block *sb);
	134
	135	/* amigaffs.c */
	136
	137	extern int affs_insert_hash(struct inode inode, struct buffer_head bh);
	138	extern int affs_remove_hash(struct inode dir, struct buffer_head rem_bh);
	139	extern int affs_remove_header(struct dentry *dentry);
	140	extern u32 affs_checksum_block(struct super_block sb, struct buffer_head bh);
	141	extern void affs_fix_checksum(struct super_block sb, struct buffer_head bh);
	142	extern void affs_secs_to_datestamp(time64_t secs, struct affs_date *ds);
	143	extern umode_t affs_prot_to_mode(u32 prot);
	144	extern void affs_mode_to_prot(struct inode *inode);
	145	__printf(3, 4)
	146	extern void affs_error(struct super_block sb, const char function,
	147	const char *fmt, ...);
	148	__printf(3, 4)
	149	extern void affs_warning(struct super_block sb, const char function,
	150	const char *fmt, ...);
	151	extern bool affs_nofilenametruncate(const struct dentry *dentry);
	152	extern int affs_check_name(const unsigned char *name, int len,
	153	bool notruncate);
	154	extern int affs_copy_name(unsigned char bstr, struct dentry dentry);
	155
	156	/* bitmap. c */
	157
	158	extern u32 affs_count_free_blocks(struct super_block *s);
	159	extern void affs_free_block(struct super_block *sb, u32 block);
	160	extern u32 affs_alloc_block(struct inode *inode, u32 goal);
	161	extern int affs_init_bitmap(struct super_block sb, int flags);
	162	extern void affs_free_bitmap(struct super_block *sb);
	163
	164	/* namei.c */
	165
	166	extern const struct export_operations affs_export_ops;
	167	extern int affs_hash_name(struct super_block sb, const u8 name, unsigned int len);
	168	extern struct dentry affs_lookup(struct inode dir, struct dentry *dentry, unsigned int);
	169	extern int affs_unlink(struct inode dir, struct dentry dentry);
	170	extern int affs_create(struct inode dir, struct dentry dentry, umode_t mode, bool);
	171	extern int affs_mkdir(struct inode dir, struct dentry dentry, umode_t mode);
	172	extern int affs_rmdir(struct inode dir, struct dentry dentry);
	173	extern int affs_link(struct dentry olddentry, struct inode dir,
	174	struct dentry *dentry);
	175	extern int affs_symlink(struct inode dir, struct dentry dentry,
	176	const char *symname);
	177	extern int affs_rename2(struct inode old_dir, struct dentry old_dentry,
	178	struct inode new_dir, struct dentry new_dentry,
	179	unsigned int flags);
	180
	181	/* inode.c */
	182
	183	extern struct inode affs_new_inode(struct inode dir);
	184	extern int affs_notify_change(struct dentry dentry, struct iattr attr);
	185	extern void affs_evict_inode(struct inode *inode);
	186	extern struct inode affs_iget(struct super_block sb,
	187	unsigned long ino);
	188	extern int affs_write_inode(struct inode *inode,
	189	struct writeback_control *wbc);
	190	extern int affs_add_entry(struct inode dir, struct inode inode, struct dentry *dentry, s32 type);
	191
	192	/* file.c */
	193
	194	void affs_free_prealloc(struct inode *inode);
	195	extern void affs_truncate(struct inode *);
	196	int affs_file_fsync(struct file *, loff_t, loff_t, int);
	197
	198	/* dir.c */
	199
	200	extern void affs_dir_truncate(struct inode *);
	201
	202	/* jump tables */
	203
	204	extern const struct inode_operations affs_file_inode_operations;
	205	extern const struct inode_operations affs_dir_inode_operations;
	206	extern const struct inode_operations affs_symlink_inode_operations;
	207	extern const struct file_operations affs_file_operations;
	208	extern const struct file_operations affs_file_operations_ofs;
	209	extern const struct file_operations affs_dir_operations;
	210	extern const struct address_space_operations affs_symlink_aops;
	211	extern const struct address_space_operations affs_aops;
	212	extern const struct address_space_operations affs_aops_ofs;
	213
	214	extern const struct dentry_operations affs_dentry_operations;
	215	extern const struct dentry_operations affs_intl_dentry_operations;
	216
	217	static inline bool affs_validblock(struct super_block *sb, int block)
	218	{
	219	return(block >= AFFS_SB(sb)->s_reserved &&
	220	block < AFFS_SB(sb)->s_partition_size);
	221	}
	222
	223	static inline void
	224	affs_set_blocksize(struct super_block *sb, int size)
	225	{
	226	sb_set_blocksize(sb, size);
	227	}
	228	static inline struct buffer_head *
	229	affs_bread(struct super_block *sb, int block)
	230	{
	231	pr_debug("%s: %d\n", __func__, block);
	232	if (affs_validblock(sb, block))
	233	return sb_bread(sb, block);
	234	return NULL;
	235	}
	236	static inline struct buffer_head *
	237	affs_getblk(struct super_block *sb, int block)
	238	{
	239	pr_debug("%s: %d\n", __func__, block);
	240	if (affs_validblock(sb, block))
	241	return sb_getblk(sb, block);
	242	return NULL;
	243	}
	244	static inline struct buffer_head *
	245	affs_getzeroblk(struct super_block *sb, int block)
	246	{
	247	struct buffer_head *bh;
	248	pr_debug("%s: %d\n", __func__, block);
	249	if (affs_validblock(sb, block)) {
	250	bh = sb_getblk(sb, block);
	251	lock_buffer(bh);
	252	memset(bh->b_data, 0 , sb->s_blocksize);
	253	set_buffer_uptodate(bh);
	254	unlock_buffer(bh);
	255	return bh;
	256	}
	257	return NULL;
	258	}
	259	static inline struct buffer_head *
	260	affs_getemptyblk(struct super_block *sb, int block)
	261	{
	262	struct buffer_head *bh;
	263	pr_debug("%s: %d\n", __func__, block);
	264	if (affs_validblock(sb, block)) {
	265	bh = sb_getblk(sb, block);
	266	wait_on_buffer(bh);
	267	set_buffer_uptodate(bh);
	268	return bh;
	269	}
	270	return NULL;
	271	}
	272	static inline void
	273	affs_brelse(struct buffer_head *bh)
	274	{
	275	if (bh)
	276	pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr);
	277	brelse(bh);
	278	}
	279
	280	static inline void
	281	affs_adjust_checksum(struct buffer_head *bh, u32 val)
	282	{
	283	u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
	284	((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
	285	}
	286	static inline void
	287	affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
	288	{
	289	u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
	290	((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
	291	}
	292
	293	static inline void
	294	affs_lock_link(struct inode *inode)
	295	{
	296	down(&AFFS_I(inode)->i_link_lock);
	297	}
	298	static inline void
	299	affs_unlock_link(struct inode *inode)
	300	{
	301	up(&AFFS_I(inode)->i_link_lock);
	302	}
	303	static inline void
	304	affs_lock_dir(struct inode *inode)
	305	{
	306	down(&AFFS_I(inode)->i_hash_lock);
	307	}
	308	static inline void
	309	affs_unlock_dir(struct inode *inode)
	310	{
	311	up(&AFFS_I(inode)->i_hash_lock);
	312	}
	313	static inline void
	314	affs_lock_ext(struct inode *inode)
	315	{
	316	down(&AFFS_I(inode)->i_ext_lock);
	317	}
	318	static inline void
	319	affs_unlock_ext(struct inode *inode)
	320	{
	321	up(&AFFS_I(inode)->i_ext_lock);
	322	}