[deliverable/linux.git] / fs / hpfs / hpfs_fn.h

/*
 *  linux/fs/hpfs/hpfs_fn.h
 *
 *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
 *
 *  function headers
 */

//#define DBG
//#define DEBUG_LOCKS
#ifdef pr_fmt
#undef pr_fmt
#endif

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/mutex.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/blkdev.h>
#include <asm/unaligned.h>

#include "hpfs.h"

#define EIOERROR  EIO
#define EFSERROR  EPERM
#define EMEMERROR ENOMEM

#define ANODE_ALLOC_FWD	512
#define FNODE_ALLOC_FWD	0
#define ALLOC_FWD_MIN	16
#define ALLOC_FWD_MAX	128
#define ALLOC_M		1
#define FNODE_RD_AHEAD	16
#define ANODE_RD_AHEAD	0
#define DNODE_RD_AHEAD	72
#define COUNT_RD_AHEAD	62

#define FREE_DNODES_ADD	58
#define FREE_DNODES_DEL	29

#define CHKCOND(x,y) if (!(x)) printk y

struct hpfs_inode_info {
	loff_t mmu_private;
	ino_t i_parent_dir;	/* (directories) gives fnode of parent dir */
	unsigned i_dno;		/* (directories) root dnode */
	unsigned i_dpos;	/* (directories) temp for readdir */
	unsigned i_dsubdno;	/* (directories) temp for readdir */
	unsigned i_file_sec;	/* (files) minimalist cache of alloc info */
	unsigned i_disk_sec;	/* (files) minimalist cache of alloc info */
	unsigned i_n_secs;	/* (files) minimalist cache of alloc info */
	unsigned i_ea_size;	/* size of extended attributes */
	unsigned i_ea_mode : 1;	/* file's permission is stored in ea */
	unsigned i_ea_uid : 1;	/* file's uid is stored in ea */
	unsigned i_ea_gid : 1;	/* file's gid is stored in ea */
	unsigned i_dirty : 1;
	loff_t **i_rddir_off;
	struct inode vfs_inode;
};

struct hpfs_sb_info {
	struct mutex hpfs_mutex;	/* global hpfs lock */
	ino_t sb_root;			/* inode number of root dir */
	unsigned sb_fs_size;		/* file system size, sectors */
	unsigned sb_bitmaps;		/* sector number of bitmap list */
	unsigned sb_dirband_start;	/* directory band start sector */
	unsigned sb_dirband_size;	/* directory band size, dnodes */
	unsigned sb_dmap;		/* sector number of dnode bit map */
	unsigned sb_n_free;		/* free blocks for statfs, or -1 */
	unsigned sb_n_free_dnodes;	/* free dnodes for statfs, or -1 */
	kuid_t sb_uid;			/* uid from mount options */
	kgid_t sb_gid;			/* gid from mount options */
	umode_t sb_mode;		/* mode from mount options */
	unsigned sb_eas : 2;		/* eas: 0-ignore, 1-ro, 2-rw */
	unsigned sb_err : 2;		/* on errs: 0-cont, 1-ro, 2-panic */
	unsigned sb_chk : 2;		/* checks: 0-no, 1-normal, 2-strict */
	unsigned sb_lowercase : 1;	/* downcase filenames hackery */
	unsigned sb_was_error : 1;	/* there was an error, set dirty flag */
	unsigned sb_chkdsk : 2;		/* chkdsk: 0-no, 1-on errs, 2-allways */
	unsigned char *sb_cp_table;	/* code page tables: */
					/* 	128 bytes uppercasing table & */
					/*	128 bytes lowercasing table */
	__le32 *sb_bmp_dir;		/* main bitmap directory */
	unsigned sb_c_bitmap;		/* current bitmap */
	unsigned sb_max_fwd_alloc;	/* max forwad allocation */
	int sb_timeshift;
	struct rcu_head rcu;
};

/* Four 512-byte buffers and the 2k block obtained by concatenating them */

struct quad_buffer_head {
	struct buffer_head *bh[4];
	void *data;
};

/* The b-tree down pointer from a dir entry */

static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
{
  CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
  return le32_to_cpu(*(__le32 *) ((void *) de + le16_to_cpu(de->length) - 4));
}

/* The first dir entry in a dnode */

static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
{
  return (void *) dnode->dirent;
}

/* The end+1 of the dir entries */

static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
{
  CHKCOND(le32_to_cpu(dnode->first_free)>=0x14 && le32_to_cpu(dnode->first_free)<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %x\n",(unsigned)le32_to_cpu(dnode->first_free)));
  return (void *) dnode + le32_to_cpu(dnode->first_free);
}

/* The dir entry after dir entry de */

static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
{
  CHKCOND(le16_to_cpu(de->length)>=0x20 && le16_to_cpu(de->length)<0x800,("HPFS: de_next_de: de->length = %x\n",(unsigned)le16_to_cpu(de->length)));
  return (void *) de + le16_to_cpu(de->length);
}

static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
{
	return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s));
}

static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
{
	return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s));
}

static unsigned ea_valuelen(struct extended_attribute *ea)
{
	return ea->valuelen_lo + 256 * ea->valuelen_hi;
}

static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
{
	return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea));
}

static inline secno ea_sec(struct extended_attribute *ea)
{
	return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 9 + ea->namelen)));
}

static inline secno ea_len(struct extended_attribute *ea)
{
	return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 5 + ea->namelen)));
}

static inline char *ea_data(struct extended_attribute *ea)
{
	return (char *)((char *)ea + 5 + ea->namelen);
}

static inline unsigned de_size(int namelen, secno down_ptr)
{
	return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
}

static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
{
	int a;
	int n;
	if (!dst || !src) return;
	a = dst->down;
	n = dst->not_8x3;
	memcpy((char *)dst + 2, (char *)src + 2, 28);
	dst->down = a;
	dst->not_8x3 = n;
}

static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n)
{
	int i;
	if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
	if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1;
	for (i = 1; i < n; i++)
		if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1))
			return i + 1;
	return 0;
}

/* alloc.c */

int hpfs_chk_sectors(struct super_block *, secno, int, char *);
secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int);
int hpfs_alloc_if_possible(struct super_block *, secno);
void hpfs_free_sectors(struct super_block *, secno, unsigned);
int hpfs_check_free_dnodes(struct super_block *, int);
void hpfs_free_dnode(struct super_block *, secno);
struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *);
struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
int hpfs_trim_fs(struct super_block *, u64, u64, u64, unsigned *);

/* anode.c */

secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
void hpfs_remove_btree(struct super_block *, struct bplus_header *);
int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *);
void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
void hpfs_remove_fnode(struct super_block *, fnode_secno fno);

/* buffer.c */

void hpfs_prefetch_sectors(struct super_block *, unsigned, int);
void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
void hpfs_brelse4(struct quad_buffer_head *);
void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);

/* dentry.c */

extern const struct dentry_operations hpfs_dentry_operations;

/* dir.c */

struct dentry *hpfs_lookup(struct inode *, struct dentry *, unsigned int);
extern const struct file_operations hpfs_dir_ops;

/* dnode.c */

void hpfs_add_pos(struct inode *, loff_t *);
void hpfs_del_pos(struct inode *, loff_t *);
struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *,
				const unsigned char *, unsigned, secno);
int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned,
		    struct hpfs_dirent *);
int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
struct hpfs_dirent *map_dirent(struct inode *, dnode_secno,
			       const unsigned char *, unsigned, dnode_secno *,
			       struct quad_buffer_head *);
void hpfs_remove_dtree(struct super_block *, dnode_secno);
struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);

/* ea.c */

void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
void hpfs_set_ea(struct inode *, struct fnode *, const char *,
		 const char *, int);

/* file.c */

int hpfs_file_fsync(struct file *, loff_t, loff_t, int);
void hpfs_truncate(struct inode *);
extern const struct file_operations hpfs_file_ops;
extern const struct inode_operations hpfs_file_iops;
extern const struct address_space_operations hpfs_aops;

/* inode.c */

void hpfs_init_inode(struct inode *);
void hpfs_read_inode(struct inode *);
void hpfs_write_inode(struct inode *);
void hpfs_write_inode_nolock(struct inode *);
int hpfs_setattr(struct dentry *, struct iattr *);
void hpfs_write_if_changed(struct inode *);
void hpfs_evict_inode(struct inode *);

/* map.c */

__le32 *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
__le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
void hpfs_prefetch_bitmap(struct super_block *, unsigned);
unsigned char *hpfs_load_code_page(struct super_block *, secno);
__le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);

/* name.c */

unsigned char hpfs_upcase(unsigned char *, unsigned char);
int hpfs_chk_name(const unsigned char *, unsigned *);
unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
		       const unsigned char *, unsigned, int);
int hpfs_is_name_long(const unsigned char *, unsigned);
void hpfs_adjust_length(const unsigned char *, unsigned *);

/* namei.c */

extern const struct inode_operations hpfs_dir_iops;
extern const struct address_space_operations hpfs_symlink_aops;

static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
{
	return container_of(inode, struct hpfs_inode_info, vfs_inode);
}

static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
{
	return sb->s_fs_info;
}

/* super.c */

__printf(2, 3)
void hpfs_error(struct super_block *, const char *, ...);
int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
unsigned hpfs_get_free_dnodes(struct super_block *);
long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg);

/*
 * local time (HPFS) to GMT (Unix)
 */

static inline time_t local_to_gmt(struct super_block *s, time32_t t)
{
	extern struct timezone sys_tz;
	return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
}

static inline time32_t gmt_to_local(struct super_block *s, time_t t)
{
	extern struct timezone sys_tz;
	return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
}

/*
 * Locking:
 *
 * hpfs_lock() locks the whole filesystem. It must be taken
 * on any method called by the VFS.
 *
 * We don't do any per-file locking anymore, it is hard to
 * review and HPFS is not performance-sensitive anyway.
 */
static inline void hpfs_lock(struct super_block *s)
{
	struct hpfs_sb_info *sbi = hpfs_sb(s);
	mutex_lock(&sbi->hpfs_mutex);
}

static inline void hpfs_unlock(struct super_block *s)
{
	struct hpfs_sb_info *sbi = hpfs_sb(s);
	mutex_unlock(&sbi->hpfs_mutex);
}

static inline void hpfs_lock_assert(struct super_block *s)
{
	struct hpfs_sb_info *sbi = hpfs_sb(s);
	WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex));
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/hpfs/hpfs_fn.h
	3	*
	4	* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
	5	*
	6	* function headers
	7	*/
	8
	9	//#define DBG
	10	//#define DEBUG_LOCKS
14da17f9 FF	11	#ifdef pr_fmt
	12	#undef pr_fmt
	13	#endif
	14
	15	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
1da177e4	16
7bf6d78d	17	#include <linux/mutex.h>
1da177e4 LT	18	#include <linux/pagemap.h>
1da177e4 LT	19	#include <linux/buffer_head.h>
1da177e4	20	#include <linux/slab.h>
a27b5b97 MP	21	#include <linux/sched.h>
a27b5b97 MP	22	#include <linux/blkdev.h>
d0969d19	23	#include <asm/unaligned.h>
1da177e4 LT	24
	25	#include "hpfs.h"
	26
	27	#define EIOERROR EIO
	28	#define EFSERROR EPERM
	29	#define EMEMERROR ENOMEM
	30
	31	#define ANODE_ALLOC_FWD 512
	32	#define FNODE_ALLOC_FWD 0
	33	#define ALLOC_FWD_MIN 16
	34	#define ALLOC_FWD_MAX 128
	35	#define ALLOC_M 1
	36	#define FNODE_RD_AHEAD 16
275f495d MP	37	#define ANODE_RD_AHEAD 0
	38	#define DNODE_RD_AHEAD 72
	39	#define COUNT_RD_AHEAD 62
1da177e4 LT	40
	41	#define FREE_DNODES_ADD 58
	42	#define FREE_DNODES_DEL 29
	43
	44	#define CHKCOND(x,y) if (!(x)) printk y
	45
1da177e4 LT	46	struct hpfs_inode_info {
	47	loff_t mmu_private;
	48	ino_t i_parent_dir; /* (directories) gives fnode of parent dir */
	49	unsigned i_dno; /* (directories) root dnode */
	50	unsigned i_dpos; /* (directories) temp for readdir */
	51	unsigned i_dsubdno; /* (directories) temp for readdir */
	52	unsigned i_file_sec; /* (files) minimalist cache of alloc info */
	53	unsigned i_disk_sec; /* (files) minimalist cache of alloc info */
	54	unsigned i_n_secs; /* (files) minimalist cache of alloc info */
	55	unsigned i_ea_size; /* size of extended attributes */
1da177e4 LT	56	unsigned i_ea_mode : 1; /* file's permission is stored in ea */
	57	unsigned i_ea_uid : 1; /* file's uid is stored in ea */
	58	unsigned i_ea_gid : 1; /* file's gid is stored in ea */
	59	unsigned i_dirty : 1;
1da177e4 LT	60	loff_t **i_rddir_off;
	61	struct inode vfs_inode;
	62	};
	63
	64	struct hpfs_sb_info {
7dd29d8d	65	struct mutex hpfs_mutex; /* global hpfs lock */
1da177e4 LT	66	ino_t sb_root; /* inode number of root dir */
	67	unsigned sb_fs_size; /* file system size, sectors */
	68	unsigned sb_bitmaps; /* sector number of bitmap list */
	69	unsigned sb_dirband_start; /* directory band start sector */
	70	unsigned sb_dirband_size; /* directory band size, dnodes */
	71	unsigned sb_dmap; /* sector number of dnode bit map */
	72	unsigned sb_n_free; /* free blocks for statfs, or -1 */
	73	unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */
0e1a43c7 EB	74	kuid_t sb_uid; /* uid from mount options */
0e1a43c7 EB	75	kgid_t sb_gid; /* gid from mount options */
1da177e4	76	umode_t sb_mode; /* mode from mount options */
1da177e4 LT	77	unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
	78	unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
	79	unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
	80	unsigned sb_lowercase : 1; /* downcase filenames hackery */
	81	unsigned sb_was_error : 1; /* there was an error, set dirty flag */
	82	unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
	83	unsigned char sb_cp_table; / code page tables: */
	84	/* 128 bytes uppercasing table & */
	85	/* 128 bytes lowercasing table */
28fe3c19	86	__le32 sb_bmp_dir; / main bitmap directory */
1da177e4 LT	87	unsigned sb_c_bitmap; /* current bitmap */
1da177e4 LT	88	unsigned sb_max_fwd_alloc; /* max forwad allocation */
1da177e4	89	int sb_timeshift;
30687e0a	90	struct rcu_head rcu;
1da177e4 LT	91	};
1da177e4 LT	92
1da177e4 LT	93	/* Four 512-byte buffers and the 2k block obtained by concatenating them */
	94
	95	struct quad_buffer_head {
	96	struct buffer_head *bh[4];
	97	void *data;
	98	};
	99
	100	/* The b-tree down pointer from a dir entry */
	101
	102	static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
	103	{
	104	CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
46287aa6	105	return le32_to_cpu((__le32 ) ((void *) de + le16_to_cpu(de->length) - 4));
1da177e4 LT	106	}
	107
	108	/* The first dir entry in a dnode */
	109
	110	static inline struct hpfs_dirent dnode_first_de (struct dnode dnode)
	111	{
	112	return (void *) dnode->dirent;
	113	}
	114
	115	/* The end+1 of the dir entries */
	116
	117	static inline struct hpfs_dirent dnode_end_de (struct dnode dnode)
	118	{
0b69760b MP	119	CHKCOND(le32_to_cpu(dnode->first_free)>=0x14 && le32_to_cpu(dnode->first_free)<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %x\n",(unsigned)le32_to_cpu(dnode->first_free)));
0b69760b MP	120	return (void *) dnode + le32_to_cpu(dnode->first_free);
1da177e4 LT	121	}
	122
	123	/* The dir entry after dir entry de */
	124
	125	static inline struct hpfs_dirent de_next_de (struct hpfs_dirent de)
	126	{
0b69760b MP	127	CHKCOND(le16_to_cpu(de->length)>=0x20 && le16_to_cpu(de->length)<0x800,("HPFS: de_next_de: de->length = %x\n",(unsigned)le16_to_cpu(de->length)));
0b69760b MP	128	return (void *) de + le16_to_cpu(de->length);
1da177e4 LT	129	}
	130
	131	static inline struct extended_attribute fnode_ea(struct fnode fnode)
	132	{
0b69760b	133	return (struct extended_attribute )((char )fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s));
1da177e4 LT	134	}
	135
	136	static inline struct extended_attribute fnode_end_ea(struct fnode fnode)
	137	{
0b69760b	138	return (struct extended_attribute )((char )fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s));
1da177e4 LT	139	}
1da177e4 LT	140
d0969d19 MP	141	static unsigned ea_valuelen(struct extended_attribute *ea)
	142	{
	143	return ea->valuelen_lo + 256 * ea->valuelen_hi;
	144	}
	145
1da177e4 LT	146	static inline struct extended_attribute next_ea(struct extended_attribute ea)
1da177e4 LT	147	{
d0969d19	148	return (struct extended_attribute )((char )ea + 5 + ea->namelen + ea_valuelen(ea));
1da177e4 LT	149	}
	150
	151	static inline secno ea_sec(struct extended_attribute *ea)
	152	{
77ee26e4	153	return le32_to_cpu(get_unaligned((__le32 )((char )ea + 9 + ea->namelen)));
1da177e4 LT	154	}
	155
	156	static inline secno ea_len(struct extended_attribute *ea)
	157	{
77ee26e4	158	return le32_to_cpu(get_unaligned((__le32 )((char )ea + 5 + ea->namelen)));
1da177e4 LT	159	}
	160
	161	static inline char ea_data(struct extended_attribute ea)
	162	{
	163	return (char )((char )ea + 5 + ea->namelen);
	164	}
	165
	166	static inline unsigned de_size(int namelen, secno down_ptr)
	167	{
	168	return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
	169	}
	170
	171	static inline void copy_de(struct hpfs_dirent dst, struct hpfs_dirent src)
	172	{
	173	int a;
	174	int n;
	175	if (!dst \|\| !src) return;
	176	a = dst->down;
	177	n = dst->not_8x3;
	178	memcpy((char )dst + 2, (char )src + 2, 28);
	179	dst->down = a;
	180	dst->not_8x3 = n;
	181	}
	182
52576da3	183	static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n)
1da177e4 LT	184	{
	185	int i;
	186	if ((b >= 0x4000) \|\| (b + n - 1 >= 0x4000)) return n;
0b69760b	187	if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1;
1da177e4	188	for (i = 1; i < n; i++)
0b69760b	189	if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1))
1da177e4 LT	190	return i + 1;
	191	return 0;
	192	}
	193
	194	/* alloc.c */
	195
	196	int hpfs_chk_sectors(struct super_block , secno, int, char );
7d23ce36	197	secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int);
1da177e4 LT	198	int hpfs_alloc_if_possible(struct super_block *, secno);
	199	void hpfs_free_sectors(struct super_block *, secno, unsigned);
	200	int hpfs_check_free_dnodes(struct super_block *, int);
	201	void hpfs_free_dnode(struct super_block *, secno);
7d23ce36	202	struct dnode hpfs_alloc_dnode(struct super_block , secno, dnode_secno , struct quad_buffer_head );
1da177e4 LT	203	struct fnode hpfs_alloc_fnode(struct super_block , secno, fnode_secno , struct buffer_head *);
1da177e4 LT	204	struct anode hpfs_alloc_anode(struct super_block , secno, anode_secno , struct buffer_head *);
a27b5b97	205	int hpfs_trim_fs(struct super_block , u64, u64, u64, unsigned );
1da177e4 LT	206
	207	/* anode.c */
	208
	209	secno hpfs_bplus_lookup(struct super_block , struct inode , struct bplus_header , unsigned, struct buffer_head );
	210	secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
	211	void hpfs_remove_btree(struct super_block , struct bplus_header );
	212	int hpfs_ea_read(struct super_block , secno, int, unsigned, unsigned, char );
7e7742ee	213	int hpfs_ea_write(struct super_block , secno, int, unsigned, unsigned, const char );
1da177e4 LT	214	void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
	215	void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
	216	void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
	217
	218	/* buffer.c */
	219
275f495d	220	void hpfs_prefetch_sectors(struct super_block *, unsigned, int);
1da177e4 LT	221	void hpfs_map_sector(struct super_block , unsigned, struct buffer_head **, int);
	222	void hpfs_get_sector(struct super_block , unsigned, struct buffer_head **);
	223	void hpfs_map_4sectors(struct super_block , unsigned, struct quad_buffer_head *, int);
	224	void hpfs_get_4sectors(struct super_block , unsigned, struct quad_buffer_head *);
	225	void hpfs_brelse4(struct quad_buffer_head *);
	226	void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
	227
	228	/* dentry.c */
	229
43d344d7	230	extern const struct dentry_operations hpfs_dentry_operations;
1da177e4 LT	231
	232	/* dir.c */
	233
00cd8dd3	234	struct dentry hpfs_lookup(struct inode , struct dentry *, unsigned int);
4b6f5d20	235	extern const struct file_operations hpfs_dir_ops;
1da177e4 LT	236
	237	/* dnode.c */
	238
	239	void hpfs_add_pos(struct inode , loff_t );
	240	void hpfs_del_pos(struct inode , loff_t );
7e7742ee AV	241	struct hpfs_dirent hpfs_add_de(struct super_block , struct dnode *,
	242	const unsigned char *, unsigned, secno);
	243	int hpfs_add_dirent(struct inode , const unsigned char , unsigned,
7d23ce36	244	struct hpfs_dirent *);
1da177e4 LT	245	int hpfs_remove_dirent(struct inode , dnode_secno, struct hpfs_dirent , struct quad_buffer_head *, int);
	246	void hpfs_count_dnodes(struct super_block , dnode_secno, int , int , int );
	247	dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
	248	struct hpfs_dirent map_pos_dirent(struct inode , loff_t , struct quad_buffer_head );
7e7742ee AV	249	struct hpfs_dirent map_dirent(struct inode , dnode_secno,
	250	const unsigned char , unsigned, dnode_secno ,
	251	struct quad_buffer_head *);
1da177e4 LT	252	void hpfs_remove_dtree(struct super_block *, dnode_secno);
	253	struct hpfs_dirent map_fnode_dirent(struct super_block , fnode_secno, struct fnode , struct quad_buffer_head );
	254
	255	/* ea.c */
	256
	257	void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
	258	int hpfs_read_ea(struct super_block , struct fnode , char , char , int);
	259	char hpfs_get_ea(struct super_block , struct fnode , char , int *);
7e7742ee AV	260	void hpfs_set_ea(struct inode , struct fnode , const char *,
7e7742ee AV	261	const char *, int);
1da177e4 LT	262
	263	/* file.c */
	264
02c24a82	265	int hpfs_file_fsync(struct file *, loff_t, loff_t, int);
70b31c4c	266	void hpfs_truncate(struct inode *);
4b6f5d20	267	extern const struct file_operations hpfs_file_ops;
92e1d5be	268	extern const struct inode_operations hpfs_file_iops;
f5e54d6e	269	extern const struct address_space_operations hpfs_aops;
1da177e4 LT	270
	271	/* inode.c */
	272
	273	void hpfs_init_inode(struct inode *);
	274	void hpfs_read_inode(struct inode *);
	275	void hpfs_write_inode(struct inode *);
	276	void hpfs_write_inode_nolock(struct inode *);
ca30bc99	277	int hpfs_setattr(struct dentry , struct iattr );
1da177e4	278	void hpfs_write_if_changed(struct inode *);
ea544009	279	void hpfs_evict_inode(struct inode *);
1da177e4 LT	280
	281	/* map.c */
	282
52576da3 AV	283	__le32 hpfs_map_dnode_bitmap(struct super_block , struct quad_buffer_head *);
52576da3 AV	284	__le32 hpfs_map_bitmap(struct super_block , unsigned, struct quad_buffer_head , char );
275f495d	285	void hpfs_prefetch_bitmap(struct super_block *, unsigned);
7e7742ee	286	unsigned char hpfs_load_code_page(struct super_block , secno);
28fe3c19	287	__le32 hpfs_load_bitmap_directory(struct super_block , secno bmp);
1da177e4 LT	288	struct fnode hpfs_map_fnode(struct super_block s, ino_t, struct buffer_head **);
	289	struct anode hpfs_map_anode(struct super_block s, anode_secno, struct buffer_head **);
	290	struct dnode hpfs_map_dnode(struct super_block s, dnode_secno, struct quad_buffer_head *);
	291	dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
	292
	293	/* name.c */
	294
	295	unsigned char hpfs_upcase(unsigned char *, unsigned char);
7e7742ee AV	296	int hpfs_chk_name(const unsigned char , unsigned );
	297	unsigned char hpfs_translate_name(struct super_block , unsigned char *, unsigned, int, int);
	298	int hpfs_compare_names(struct super_block , const unsigned char , unsigned,
	299	const unsigned char *, unsigned, int);
	300	int hpfs_is_name_long(const unsigned char *, unsigned);
	301	void hpfs_adjust_length(const unsigned char , unsigned );
1da177e4 LT	302
	303	/* namei.c */
	304
92e1d5be	305	extern const struct inode_operations hpfs_dir_iops;
f5e54d6e	306	extern const struct address_space_operations hpfs_symlink_aops;
1da177e4 LT	307
	308	static inline struct hpfs_inode_info hpfs_i(struct inode inode)
	309	{
db6172c4	310	return container_of(inode, struct hpfs_inode_info, vfs_inode);
1da177e4 LT	311	}
	312
	313	static inline struct hpfs_sb_info hpfs_sb(struct super_block sb)
	314	{
	315	return sb->s_fs_info;
	316	}
	317
	318	/* super.c */
	319
b9075fa9 JP	320	__printf(2, 3)
b9075fa9 JP	321	void hpfs_error(struct super_block , const char , ...);
1da177e4	322	int hpfs_stop_cycles(struct super_block , int, int , int , char );
2cbe5c76	323	unsigned hpfs_get_free_dnodes(struct super_block *);
a27b5b97	324	long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg);
1da177e4 LT	325
	326	/*
	327	* local time (HPFS) to GMT (Unix)
	328	*/
	329
	330	static inline time_t local_to_gmt(struct super_block *s, time32_t t)
	331	{
	332	extern struct timezone sys_tz;
	333	return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
	334	}
	335
	336	static inline time32_t gmt_to_local(struct super_block *s, time_t t)
	337	{
	338	extern struct timezone sys_tz;
	339	return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
	340	}
9a311b96 AB	341
	342	/*
	343	* Locking:
	344	*
7dd29d8d MP	345	* hpfs_lock() locks the whole filesystem. It must be taken
7dd29d8d MP	346	* on any method called by the VFS.
9a311b96	347	*
7dd29d8d MP	348	* We don't do any per-file locking anymore, it is hard to
7dd29d8d MP	349	* review and HPFS is not performance-sensitive anyway.
9a311b96 AB	350	*/
	351	static inline void hpfs_lock(struct super_block *s)
	352	{
7dd29d8d MP	353	struct hpfs_sb_info *sbi = hpfs_sb(s);
7dd29d8d MP	354	mutex_lock(&sbi->hpfs_mutex);
9a311b96 AB	355	}
	356
	357	static inline void hpfs_unlock(struct super_block *s)
	358	{
7dd29d8d MP	359	struct hpfs_sb_info *sbi = hpfs_sb(s);
	360	mutex_unlock(&sbi->hpfs_mutex);
	361	}
	362
	363	static inline void hpfs_lock_assert(struct super_block *s)
	364	{
	365	struct hpfs_sb_info *sbi = hpfs_sb(s);
	366	WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex));
9a311b96	367	}