[linux-2.6-block.git] / fs / affs / affs.h

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

/* AmigaOS allows file names with up to 30 characters length.
 * Names longer than that will be silently truncated. If you
 * want to disallow this, comment out the following #define.
 * Creating filesystem objects with longer names will then
 * result in an error (ENAMETOOLONG).
 */
/*#define AFFS_NO_TRUNCATE */

/* 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_MAX_PREALLOC	32
#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)

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 list_entry(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. */
	uid_t s_uid;			/* uid to override */
	gid_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 SF_INTL		0x0001		/* International filesystem. */
#define SF_BM_VALID	0x0002		/* Bitmap is valid. */
#define SF_IMMUTABLE	0x0004		/* Protection bits cannot be changed */
#define SF_QUIET	0x0008		/* chmod errors will be not reported */
#define SF_SETUID	0x0010		/* Ignore Amiga uid */
#define SF_SETGID	0x0020		/* Ignore Amiga gid */
#define SF_SETMODE	0x0040		/* Ignore Amiga protection bits */
#define SF_MUFS		0x0100		/* Use MUFS uid/gid mapping */
#define SF_OFS		0x0200		/* Old filesystem */
#define SF_PREFIX	0x0400		/* Buffer for prefix is allocated */
#define SF_VERBOSE	0x0800		/* Talk about fs when mounting */

/* 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	secs_to_datestamp(time_t secs, struct affs_date *ds);
extern umode_t	prot_to_mode(u32 prot);
extern void	mode_to_prot(struct inode *inode);
extern void	affs_error(struct super_block *sb, const char *function, const char *fmt, ...);
extern void	affs_warning(struct super_block *sb, const char *function, const char *fmt, ...);
extern int	affs_check_name(const unsigned char *name, int len);
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 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, struct nameidata *);
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_rename(struct inode *old_dir, struct dentry *old_dentry,
			    struct inode *new_dir, struct dentry *new_dentry);

/* inode.c */

extern unsigned long		 affs_parent_ino(struct inode *dir);
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 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("affs_bread: %d\n", block);
	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
		return sb_bread(sb, block);
	return NULL;
}
static inline struct buffer_head *
affs_getblk(struct super_block *sb, int block)
{
	pr_debug("affs_getblk: %d\n", block);
	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
		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("affs_getzeroblk: %d\n", block);
	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
		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("affs_getemptyblk: %d\n", block);
	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
		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("affs_brelse: %lld\n", (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
1da177e4 LT	1	#include <linux/types.h>
	2	#include <linux/fs.h>
	3	#include <linux/buffer_head.h>
1da177e4	4	#include <linux/amigaffs.h>
7d135a5d	5	#include <linux/mutex.h>
3dd84782	6	#include <linux/workqueue.h>
1da177e4 LT	7
	8	/* AmigaOS allows file names with up to 30 characters length.
	9	* Names longer than that will be silently truncated. If you
	10	* want to disallow this, comment out the following #define.
	11	* Creating filesystem objects with longer names will then
	12	* result in an error (ENAMETOOLONG).
	13	*/
	14	/#define AFFS_NO_TRUNCATE /
	15
	16	/* Ugly macros make the code more pretty. */
	17
	18	#define GET_END_PTR(st,p,sz) ((st )((char )(p)+((sz)-sizeof(st))))
	19	#define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
	20	#define AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
	21
1da177e4 LT	22	#define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data)
	23	#define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
	24	#define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data)
	25	#define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
	26	#define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data)
	27	#define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data)
	28
	29	#define AFFS_CACHE_SIZE PAGE_SIZE
	30
	31	#define AFFS_MAX_PREALLOC 32
	32	#define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2)
	33	#define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
	34	#define AFFS_AC_MASK (AFFS_AC_SIZE-1)
	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 {
dca3c336	45	atomic_t i_opencnt;
1da177e4 LT	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 list_entry(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	uid_t s_uid; /* uid to override */
	92	gid_t s_gid; /* gid to override */
	93	umode_t s_mode; /* mode to override */
	94	struct buffer_head s_root_bh; / Cached root block. */
7d135a5d	95	struct mutex s_bmlock; /* Protects bitmap access. */
1da177e4 LT	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. */
1da177e4	102	char s_volume[32]; /* Volume prefix for absolute symlinks. */
29333920	103	spinlock_t symlink_lock; /* protects the previous two */
a215fef7	104	struct super_block sb; / the VFS superblock object */
3dd84782 AB	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 */
1da177e4 LT	108	};
	109
	110	#define SF_INTL 0x0001 /* International filesystem. */
	111	#define SF_BM_VALID 0x0002 /* Bitmap is valid. */
	112	#define SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */
	113	#define SF_QUIET 0x0008 /* chmod errors will be not reported */
	114	#define SF_SETUID 0x0010 /* Ignore Amiga uid */
	115	#define SF_SETGID 0x0020 /* Ignore Amiga gid */
	116	#define SF_SETMODE 0x0040 /* Ignore Amiga protection bits */
	117	#define SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */
	118	#define SF_OFS 0x0200 /* Old filesystem */
	119	#define SF_PREFIX 0x0400 /* Buffer for prefix is allocated */
	120	#define SF_VERBOSE 0x0800 /* Talk about fs when mounting */
	121
	122	/* short cut to get to the affs specific sb data */
	123	static inline struct affs_sb_info AFFS_SB(struct super_block sb)
	124	{
	125	return sb->s_fs_info;
	126	}
	127
3dd84782 AB	128	void affs_mark_sb_dirty(struct super_block *sb);
3dd84782 AB	129
1da177e4 LT	130	/* amigaffs.c */
	131
	132	extern int affs_insert_hash(struct inode inode, struct buffer_head bh);
	133	extern int affs_remove_hash(struct inode dir, struct buffer_head rem_bh);
	134	extern int affs_remove_header(struct dentry *dentry);
	135	extern u32 affs_checksum_block(struct super_block sb, struct buffer_head bh);
	136	extern void affs_fix_checksum(struct super_block sb, struct buffer_head bh);
	137	extern void secs_to_datestamp(time_t secs, struct affs_date *ds);
a760b03d	138	extern umode_t prot_to_mode(u32 prot);
1da177e4 LT	139	extern void mode_to_prot(struct inode *inode);
	140	extern void affs_error(struct super_block sb, const char function, const char *fmt, ...);
	141	extern void affs_warning(struct super_block sb, const char function, const char *fmt, ...);
	142	extern int affs_check_name(const unsigned char *name, int len);
	143	extern int affs_copy_name(unsigned char bstr, struct dentry dentry);
	144
	145	/* bitmap. c */
	146
	147	extern u32 affs_count_free_blocks(struct super_block *s);
	148	extern void affs_free_block(struct super_block *sb, u32 block);
	149	extern u32 affs_alloc_block(struct inode *inode, u32 goal);
	150	extern int affs_init_bitmap(struct super_block sb, int flags);
	151	extern void affs_free_bitmap(struct super_block *sb);
	152
	153	/* namei.c */
	154
	155	extern int affs_hash_name(struct super_block sb, const u8 name, unsigned int len);
00cd8dd3	156	extern struct dentry affs_lookup(struct inode dir, struct dentry *dentry, unsigned int);
1da177e4	157	extern int affs_unlink(struct inode dir, struct dentry dentry);
4acdaf27	158	extern int affs_create(struct inode dir, struct dentry dentry, umode_t mode, struct nameidata *);
18bb1db3	159	extern int affs_mkdir(struct inode dir, struct dentry dentry, umode_t mode);
1da177e4 LT	160	extern int affs_rmdir(struct inode dir, struct dentry dentry);
	161	extern int affs_link(struct dentry olddentry, struct inode dir,
	162	struct dentry *dentry);
	163	extern int affs_symlink(struct inode dir, struct dentry dentry,
	164	const char *symname);
	165	extern int affs_rename(struct inode old_dir, struct dentry old_dentry,
	166	struct inode new_dir, struct dentry new_dentry);
	167
	168	/* inode.c */
	169
	170	extern unsigned long affs_parent_ino(struct inode *dir);
	171	extern struct inode affs_new_inode(struct inode dir);
	172	extern int affs_notify_change(struct dentry dentry, struct iattr attr);
f053ddde	173	extern void affs_evict_inode(struct inode *inode);
210f8559 DH	174	extern struct inode affs_iget(struct super_block sb,
210f8559 DH	175	unsigned long ino);
a9185b41 CH	176	extern int affs_write_inode(struct inode *inode,
a9185b41 CH	177	struct writeback_control *wbc);
1da177e4 LT	178	extern int affs_add_entry(struct inode dir, struct inode inode, struct dentry *dentry, s32 type);
	179
	180	/* file.c */
	181
	182	void affs_free_prealloc(struct inode *inode);
	183	extern void affs_truncate(struct inode *);
02c24a82	184	int affs_file_fsync(struct file *, loff_t, loff_t, int);
1da177e4 LT	185
	186	/* dir.c */
	187
	188	extern void affs_dir_truncate(struct inode *);
	189
	190	/* jump tables */
	191
754661f1 AV	192	extern const struct inode_operations affs_file_inode_operations;
	193	extern const struct inode_operations affs_dir_inode_operations;
	194	extern const struct inode_operations affs_symlink_inode_operations;
4b6f5d20 AV	195	extern const struct file_operations affs_file_operations;
	196	extern const struct file_operations affs_file_operations_ofs;
	197	extern const struct file_operations affs_dir_operations;
f5e54d6e CH	198	extern const struct address_space_operations affs_symlink_aops;
	199	extern const struct address_space_operations affs_aops;
	200	extern const struct address_space_operations affs_aops_ofs;
1da177e4	201
e16404ed	202	extern const struct dentry_operations affs_dentry_operations;
a129880d	203	extern const struct dentry_operations affs_intl_dentry_operations;
1da177e4 LT	204
	205	static inline void
	206	affs_set_blocksize(struct super_block *sb, int size)
	207	{
	208	sb_set_blocksize(sb, size);
	209	}
	210	static inline struct buffer_head *
	211	affs_bread(struct super_block *sb, int block)
	212	{
	213	pr_debug("affs_bread: %d\n", block);
	214	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
	215	return sb_bread(sb, block);
	216	return NULL;
	217	}
	218	static inline struct buffer_head *
	219	affs_getblk(struct super_block *sb, int block)
	220	{
	221	pr_debug("affs_getblk: %d\n", block);
	222	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
	223	return sb_getblk(sb, block);
	224	return NULL;
	225	}
	226	static inline struct buffer_head *
	227	affs_getzeroblk(struct super_block *sb, int block)
	228	{
	229	struct buffer_head *bh;
	230	pr_debug("affs_getzeroblk: %d\n", block);
	231	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
	232	bh = sb_getblk(sb, block);
	233	lock_buffer(bh);
	234	memset(bh->b_data, 0 , sb->s_blocksize);
	235	set_buffer_uptodate(bh);
	236	unlock_buffer(bh);
	237	return bh;
	238	}
	239	return NULL;
	240	}
	241	static inline struct buffer_head *
	242	affs_getemptyblk(struct super_block *sb, int block)
	243	{
	244	struct buffer_head *bh;
	245	pr_debug("affs_getemptyblk: %d\n", block);
	246	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
	247	bh = sb_getblk(sb, block);
	248	wait_on_buffer(bh);
	249	set_buffer_uptodate(bh);
	250	return bh;
	251	}
	252	return NULL;
	253	}
	254	static inline void
	255	affs_brelse(struct buffer_head *bh)
	256	{
	257	if (bh)
	258	pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr);
	259	brelse(bh);
	260	}
	261
	262	static inline void
	263	affs_adjust_checksum(struct buffer_head *bh, u32 val)
	264	{
	265	u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
	266	((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
	267	}
268	static inline void
269	affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
270	{
271	u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
272	((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
273	}
274
275	static inline void
276	affs_lock_link(struct inode *inode)
277	{
278	down(&AFFS_I(inode)->i_link_lock);
279	}
280	static inline void
281	affs_unlock_link(struct inode *inode)
282	{
283	up(&AFFS_I(inode)->i_link_lock);
284	}
285	static inline void
286	affs_lock_dir(struct inode *inode)
287	{
288	down(&AFFS_I(inode)->i_hash_lock);
289	}
290	static inline void
291	affs_unlock_dir(struct inode *inode)
292	{
293	up(&AFFS_I(inode)->i_hash_lock);
294	}
295	static inline void
296	affs_lock_ext(struct inode *inode)
297	{
298	down(&AFFS_I(inode)->i_ext_lock);
299	}
300	static inline void
301	affs_unlock_ext(struct inode *inode)
302	{
303	up(&AFFS_I(inode)->i_ext_lock);
304	}