[deliverable/linux.git] / fs / affs / affs.h

#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 <linux/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)

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. */
	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 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 */
#define SF_NO_TRUNCATE	0x1000		/* Don't truncate filenames */

/* 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);
__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 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_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("%s: %d\n", __func__, 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("%s: %d\n", __func__, 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("%s: %d\n", __func__, 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("%s: %d\n", __func__, 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("%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
0158de12 FF	1	#ifdef pr_fmt
	2	#undef pr_fmt
	3	#endif
	4
	5	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	6
1da177e4 LT	7	#include <linux/types.h>
	8	#include <linux/fs.h>
	9	#include <linux/buffer_head.h>
1da177e4	10	#include <linux/amigaffs.h>
7d135a5d	11	#include <linux/mutex.h>
3dd84782	12	#include <linux/workqueue.h>
1da177e4	13
1da177e4 LT	14	/* Ugly macros make the code more pretty. */
	15
	16	#define GET_END_PTR(st,p,sz) ((st )((char )(p)+((sz)-sizeof(st))))
	17	#define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
	18	#define AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
	19
1da177e4 LT	20	#define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data)
	21	#define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
	22	#define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data)
	23	#define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
	24	#define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data)
	25	#define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data)
	26
	27	#define AFFS_CACHE_SIZE PAGE_SIZE
	28
1da177e4 LT	29	#define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2)
	30	#define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
	31	#define AFFS_AC_MASK (AFFS_AC_SIZE-1)
	32
	33	struct affs_ext_key {
	34	u32 ext; /* idx of the extended block */
	35	u32 key; /* block number */
	36	};
	37
	38	/*
	39	* affs fs inode data in memory
	40	*/
	41	struct affs_inode_info {
dca3c336	42	atomic_t i_opencnt;
1da177e4 LT	43	struct semaphore i_link_lock; /* Protects internal inode access. */
	44	struct semaphore i_ext_lock; /* Protects internal inode access. */
	45	#define i_hash_lock i_ext_lock
	46	u32 i_blkcnt; /* block count */
	47	u32 i_extcnt; /* extended block count */
	48	u32 i_lc; / linear cache of extended blocks */
	49	u32 i_lc_size;
	50	u32 i_lc_shift;
	51	u32 i_lc_mask;
	52	struct affs_ext_key i_ac; / associative cache of extended blocks */
	53	u32 i_ext_last; /* last accessed extended block */
	54	struct buffer_head i_ext_bh; / bh of last extended block */
	55	loff_t mmu_private;
	56	u32 i_protect; /* unused attribute bits */
	57	u32 i_lastalloc; /* last allocated block */
	58	int i_pa_cnt; /* number of preallocated blocks */
	59	struct inode vfs_inode;
	60	};
	61
	62	/* short cut to get to the affs specific inode data */
	63	static inline struct affs_inode_info AFFS_I(struct inode inode)
	64	{
	65	return list_entry(inode, struct affs_inode_info, vfs_inode);
	66	}
	67
	68	/*
	69	* super-block data in memory
	70	*
	71	* Block numbers are adjusted for their actual size
	72	*
	73	*/
	74
	75	struct affs_bm_info {
	76	u32 bm_key; /* Disk block number */
	77	u32 bm_free; /* Free blocks in here */
	78	};
	79
	80	struct affs_sb_info {
	81	int s_partition_size; /* Partition size in blocks. */
	82	int s_reserved; /* Number of reserved blocks. */
	83	//u32 s_blksize; /* Initial device blksize */
	84	u32 s_data_blksize; /* size of the data block w/o header */
	85	u32 s_root_block; /* FFS root block number. */
	86	int s_hashsize; /* Size of hash table. */
	87	unsigned long s_flags; /* See below. */
8fed10be EB	88	kuid_t s_uid; /* uid to override */
8fed10be EB	89	kgid_t s_gid; /* gid to override */
1da177e4 LT	90	umode_t s_mode; /* mode to override */
1da177e4 LT	91	struct buffer_head s_root_bh; / Cached root block. */
7d135a5d	92	struct mutex s_bmlock; /* Protects bitmap access. */
1da177e4 LT	93	struct affs_bm_info s_bitmap; / Bitmap infos. */
	94	u32 s_bmap_count; /* # of bitmap blocks. */
	95	u32 s_bmap_bits; /* # of bits in one bitmap blocks */
	96	u32 s_last_bmap;
	97	struct buffer_head *s_bmap_bh;
	98	char s_prefix; / Prefix for volumes and assigns. */
1da177e4	99	char s_volume[32]; /* Volume prefix for absolute symlinks. */
29333920	100	spinlock_t symlink_lock; /* protects the previous two */
a215fef7	101	struct super_block sb; / the VFS superblock object */
3dd84782 AB	102	int work_queued; /* non-zero delayed work is queued */
	103	struct delayed_work sb_work; /* superblock flush delayed work */
	104	spinlock_t work_lock; /* protects sb_work and work_queued */
1da177e4 LT	105	};
	106
	107	#define SF_INTL 0x0001 /* International filesystem. */
	108	#define SF_BM_VALID 0x0002 /* Bitmap is valid. */
	109	#define SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */
	110	#define SF_QUIET 0x0008 /* chmod errors will be not reported */
	111	#define SF_SETUID 0x0010 /* Ignore Amiga uid */
	112	#define SF_SETGID 0x0020 /* Ignore Amiga gid */
	113	#define SF_SETMODE 0x0040 /* Ignore Amiga protection bits */
	114	#define SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */
	115	#define SF_OFS 0x0200 /* Old filesystem */
	116	#define SF_PREFIX 0x0400 /* Buffer for prefix is allocated */
	117	#define SF_VERBOSE 0x0800 /* Talk about fs when mounting */
8ca57722	118	#define SF_NO_TRUNCATE 0x1000 /* Don't truncate filenames */
1da177e4 LT	119
	120	/* short cut to get to the affs specific sb data */
	121	static inline struct affs_sb_info AFFS_SB(struct super_block sb)
	122	{
	123	return sb->s_fs_info;
	124	}
	125
3dd84782 AB	126	void affs_mark_sb_dirty(struct super_block *sb);
3dd84782 AB	127
1da177e4 LT	128	/* amigaffs.c */
	129
	130	extern int affs_insert_hash(struct inode inode, struct buffer_head bh);
	131	extern int affs_remove_hash(struct inode dir, struct buffer_head rem_bh);
	132	extern int affs_remove_header(struct dentry *dentry);
	133	extern u32 affs_checksum_block(struct super_block sb, struct buffer_head bh);
	134	extern void affs_fix_checksum(struct super_block sb, struct buffer_head bh);
	135	extern void secs_to_datestamp(time_t secs, struct affs_date *ds);
a760b03d	136	extern umode_t prot_to_mode(u32 prot);
1da177e4	137	extern void mode_to_prot(struct inode *inode);
1ee54b09	138	__printf(3, 4)
8ca57722 FF	139	extern void affs_error(struct super_block sb, const char function,
8ca57722 FF	140	const char *fmt, ...);
1ee54b09	141	__printf(3, 4)
8ca57722 FF	142	extern void affs_warning(struct super_block sb, const char function,
	143	const char *fmt, ...);
	144	extern bool affs_nofilenametruncate(const struct dentry *dentry);
	145	extern int affs_check_name(const unsigned char *name, int len,
	146	bool notruncate);
1da177e4 LT	147	extern int affs_copy_name(unsigned char bstr, struct dentry dentry);
	148
	149	/* bitmap. c */
	150
	151	extern u32 affs_count_free_blocks(struct super_block *s);
	152	extern void affs_free_block(struct super_block *sb, u32 block);
	153	extern u32 affs_alloc_block(struct inode *inode, u32 goal);
	154	extern int affs_init_bitmap(struct super_block sb, int flags);
	155	extern void affs_free_bitmap(struct super_block *sb);
	156
	157	/* namei.c */
	158
	159	extern int affs_hash_name(struct super_block sb, const u8 name, unsigned int len);
00cd8dd3	160	extern struct dentry affs_lookup(struct inode dir, struct dentry *dentry, unsigned int);
1da177e4	161	extern int affs_unlink(struct inode dir, struct dentry dentry);
ebfc3b49	162	extern int affs_create(struct inode dir, struct dentry dentry, umode_t mode, bool);
18bb1db3	163	extern int affs_mkdir(struct inode dir, struct dentry dentry, umode_t mode);
1da177e4 LT	164	extern int affs_rmdir(struct inode dir, struct dentry dentry);
	165	extern int affs_link(struct dentry olddentry, struct inode dir,
	166	struct dentry *dentry);
	167	extern int affs_symlink(struct inode dir, struct dentry dentry,
	168	const char *symname);
	169	extern int affs_rename(struct inode old_dir, struct dentry old_dentry,
	170	struct inode new_dir, struct dentry new_dentry);
	171
	172	/* inode.c */
	173
	174	extern unsigned long affs_parent_ino(struct inode *dir);
	175	extern struct inode affs_new_inode(struct inode dir);
	176	extern int affs_notify_change(struct dentry dentry, struct iattr attr);
f053ddde	177	extern void affs_evict_inode(struct inode *inode);
210f8559 DH	178	extern struct inode affs_iget(struct super_block sb,
210f8559 DH	179	unsigned long ino);
a9185b41 CH	180	extern int affs_write_inode(struct inode *inode,
a9185b41 CH	181	struct writeback_control *wbc);
1da177e4 LT	182	extern int affs_add_entry(struct inode dir, struct inode inode, struct dentry *dentry, s32 type);
	183
	184	/* file.c */
	185
	186	void affs_free_prealloc(struct inode *inode);
	187	extern void affs_truncate(struct inode *);
02c24a82	188	int affs_file_fsync(struct file *, loff_t, loff_t, int);
1da177e4 LT	189
	190	/* dir.c */
	191
	192	extern void affs_dir_truncate(struct inode *);
	193
	194	/* jump tables */
	195
754661f1 AV	196	extern const struct inode_operations affs_file_inode_operations;
	197	extern const struct inode_operations affs_dir_inode_operations;
	198	extern const struct inode_operations affs_symlink_inode_operations;
4b6f5d20 AV	199	extern const struct file_operations affs_file_operations;
	200	extern const struct file_operations affs_file_operations_ofs;
	201	extern const struct file_operations affs_dir_operations;
f5e54d6e CH	202	extern const struct address_space_operations affs_symlink_aops;
	203	extern const struct address_space_operations affs_aops;
	204	extern const struct address_space_operations affs_aops_ofs;
1da177e4	205
e16404ed	206	extern const struct dentry_operations affs_dentry_operations;
a129880d	207	extern const struct dentry_operations affs_intl_dentry_operations;
1da177e4 LT	208
	209	static inline void
	210	affs_set_blocksize(struct super_block *sb, int size)
	211	{
	212	sb_set_blocksize(sb, size);
	213	}
	214	static inline struct buffer_head *
	215	affs_bread(struct super_block *sb, int block)
	216	{
9606d9aa	217	pr_debug("%s: %d\n", __func__, block);
1da177e4 LT	218	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
	219	return sb_bread(sb, block);
	220	return NULL;
	221	}
	222	static inline struct buffer_head *
	223	affs_getblk(struct super_block *sb, int block)
	224	{
9606d9aa	225	pr_debug("%s: %d\n", __func__, block);
1da177e4 LT	226	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
	227	return sb_getblk(sb, block);
	228	return NULL;
	229	}
	230	static inline struct buffer_head *
	231	affs_getzeroblk(struct super_block *sb, int block)
	232	{
	233	struct buffer_head *bh;
9606d9aa	234	pr_debug("%s: %d\n", __func__, block);
1da177e4 LT	235	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
	236	bh = sb_getblk(sb, block);
	237	lock_buffer(bh);
	238	memset(bh->b_data, 0 , sb->s_blocksize);
	239	set_buffer_uptodate(bh);
	240	unlock_buffer(bh);
	241	return bh;
	242	}
	243	return NULL;
	244	}
	245	static inline struct buffer_head *
	246	affs_getemptyblk(struct super_block *sb, int block)
	247	{
	248	struct buffer_head *bh;
9606d9aa	249	pr_debug("%s: %d\n", __func__, block);
1da177e4 LT	250	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
	251	bh = sb_getblk(sb, block);
	252	wait_on_buffer(bh);
	253	set_buffer_uptodate(bh);
	254	return bh;
	255	}
	256	return NULL;
	257	}
	258	static inline void
	259	affs_brelse(struct buffer_head *bh)
	260	{
	261	if (bh)
9606d9aa	262	pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr);
1da177e4 LT	263	brelse(bh);
	264	}
	265
	266	static inline void
	267	affs_adjust_checksum(struct buffer_head *bh, u32 val)
	268	{
	269	u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
	270	((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
	271	}
	272	static inline void
	273	affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
	274	{
	275	u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
	276	((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
	277	}
	278
	279	static inline void
	280	affs_lock_link(struct inode *inode)
	281	{
	282	down(&AFFS_I(inode)->i_link_lock);
	283	}
	284	static inline void
	285	affs_unlock_link(struct inode *inode)
	286	{
	287	up(&AFFS_I(inode)->i_link_lock);
	288	}
	289	static inline void
	290	affs_lock_dir(struct inode *inode)
	291	{
	292	down(&AFFS_I(inode)->i_hash_lock);
	293	}
	294	static inline void
	295	affs_unlock_dir(struct inode *inode)
	296	{
	297	up(&AFFS_I(inode)->i_hash_lock);
	298	}
	299	static inline void
	300	affs_lock_ext(struct inode *inode)
	301	{
	302	down(&AFFS_I(inode)->i_ext_lock);
	303	}
	304	static inline void
	305	affs_unlock_ext(struct inode *inode)
	306	{
	307	up(&AFFS_I(inode)->i_ext_lock);
	308	}