[linux-block.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 <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 **);

/* 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 *);

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