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

/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  linux/fs/hpfs/hpfs_fn.h
 *
 *  Mikulas Patocka ([email protected]), 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/signal.h>
#include <linux/blkdev.h>
#include <asm/unaligned.h>

#include "hpfs.h"

#define EIOERROR  EIO
#define EFSERROR  EUCLEAN

#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;

	unsigned n_hotfixes;
	secno hotfix_from[256];
	secno hotfix_to[256];
};

/* 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 */

secno hpfs_search_hotfix_map(struct super_block *s, secno sec);
unsigned hpfs_search_hotfix_map_for_range(struct super_block *s, secno sec, unsigned n);
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 */

int 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 user_namespace *, 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);
void hpfs_load_hotfix_map(struct super_block *s, struct hpfs_spare_block *spareblock);
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 time64_t local_to_gmt(struct super_block *s, time64_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, time64_t t)
{
	extern struct timezone sys_tz;
	return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
}

static inline time32_t local_get_seconds(struct super_block *s)
{
	return gmt_to_local(s, ktime_get_real_seconds());
}

/*
 * 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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	/*
	3	* linux/fs/hpfs/hpfs_fn.h
	4	*
	5	* Mikulas Patocka ([email protected]), 1998-1999
	6	*
	7	* function headers
	8	*/
	9
	10	//#define DBG
	11	//#define DEBUG_LOCKS
14da17f9 FF	12	#ifdef pr_fmt
	13	#undef pr_fmt
	14	#endif
	15
	16	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
1da177e4	17
7bf6d78d	18	#include <linux/mutex.h>
1da177e4 LT	19	#include <linux/pagemap.h>
1da177e4 LT	20	#include <linux/buffer_head.h>
1da177e4	21	#include <linux/slab.h>
174cd4b1	22	#include <linux/sched/signal.h>
a27b5b97	23	#include <linux/blkdev.h>
d0969d19	24	#include <asm/unaligned.h>
1da177e4 LT	25
	26	#include "hpfs.h"
	27
	28	#define EIOERROR EIO
f72328d2	29	#define EFSERROR EUCLEAN
1da177e4 LT	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;
a64eefaa MP	91
	92	unsigned n_hotfixes;
	93	secno hotfix_from[256];
	94	secno hotfix_to[256];
1da177e4 LT	95	};
1da177e4 LT	96
1da177e4 LT	97	/* Four 512-byte buffers and the 2k block obtained by concatenating them */
	98
	99	struct quad_buffer_head {
	100	struct buffer_head *bh[4];
	101	void *data;
	102	};
	103
	104	/* The b-tree down pointer from a dir entry */
	105
	106	static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
	107	{
	108	CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
46287aa6	109	return le32_to_cpu((__le32 ) ((void *) de + le16_to_cpu(de->length) - 4));
1da177e4 LT	110	}
	111
	112	/* The first dir entry in a dnode */
	113
	114	static inline struct hpfs_dirent dnode_first_de (struct dnode dnode)
	115	{
	116	return (void *) dnode->dirent;
	117	}
	118
	119	/* The end+1 of the dir entries */
	120
	121	static inline struct hpfs_dirent dnode_end_de (struct dnode dnode)
	122	{
0b69760b MP	123	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	124	return (void *) dnode + le32_to_cpu(dnode->first_free);
1da177e4 LT	125	}
	126
	127	/* The dir entry after dir entry de */
	128
	129	static inline struct hpfs_dirent de_next_de (struct hpfs_dirent de)
	130	{
0b69760b MP	131	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	132	return (void *) de + le16_to_cpu(de->length);
1da177e4 LT	133	}
	134
	135	static inline struct extended_attribute fnode_ea(struct fnode fnode)
	136	{
0b69760b	137	return (struct extended_attribute )((char )fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s));
1da177e4 LT	138	}
	139
	140	static inline struct extended_attribute fnode_end_ea(struct fnode fnode)
	141	{
0b69760b	142	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	143	}
1da177e4 LT	144
d0969d19 MP	145	static unsigned ea_valuelen(struct extended_attribute *ea)
	146	{
	147	return ea->valuelen_lo + 256 * ea->valuelen_hi;
	148	}
	149
1da177e4 LT	150	static inline struct extended_attribute next_ea(struct extended_attribute ea)
1da177e4 LT	151	{
d0969d19	152	return (struct extended_attribute )((char )ea + 5 + ea->namelen + ea_valuelen(ea));
1da177e4 LT	153	}
	154
	155	static inline secno ea_sec(struct extended_attribute *ea)
	156	{
77ee26e4	157	return le32_to_cpu(get_unaligned((__le32 )((char )ea + 9 + ea->namelen)));
1da177e4 LT	158	}
	159
	160	static inline secno ea_len(struct extended_attribute *ea)
	161	{
77ee26e4	162	return le32_to_cpu(get_unaligned((__le32 )((char )ea + 5 + ea->namelen)));
1da177e4 LT	163	}
	164
	165	static inline char ea_data(struct extended_attribute ea)
	166	{
	167	return (char )((char )ea + 5 + ea->namelen);
	168	}
	169
	170	static inline unsigned de_size(int namelen, secno down_ptr)
	171	{
	172	return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
	173	}
	174
	175	static inline void copy_de(struct hpfs_dirent dst, struct hpfs_dirent src)
	176	{
	177	int a;
	178	int n;
	179	if (!dst \|\| !src) return;
	180	a = dst->down;
	181	n = dst->not_8x3;
	182	memcpy((char )dst + 2, (char )src + 2, 28);
	183	dst->down = a;
	184	dst->not_8x3 = n;
	185	}
	186
52576da3	187	static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n)
1da177e4 LT	188	{
	189	int i;
	190	if ((b >= 0x4000) \|\| (b + n - 1 >= 0x4000)) return n;
0b69760b	191	if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1;
1da177e4	192	for (i = 1; i < n; i++)
0b69760b	193	if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1))
1da177e4 LT	194	return i + 1;
	195	return 0;
	196	}
	197
	198	/* alloc.c */
	199
	200	int hpfs_chk_sectors(struct super_block , secno, int, char );
7d23ce36	201	secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int);
1da177e4 LT	202	int hpfs_alloc_if_possible(struct super_block *, secno);
	203	void hpfs_free_sectors(struct super_block *, secno, unsigned);
	204	int hpfs_check_free_dnodes(struct super_block *, int);
	205	void hpfs_free_dnode(struct super_block *, secno);
7d23ce36	206	struct dnode hpfs_alloc_dnode(struct super_block , secno, dnode_secno , struct quad_buffer_head );
1da177e4 LT	207	struct fnode hpfs_alloc_fnode(struct super_block , secno, fnode_secno , struct buffer_head *);
1da177e4 LT	208	struct anode hpfs_alloc_anode(struct super_block , secno, anode_secno , struct buffer_head *);
a27b5b97	209	int hpfs_trim_fs(struct super_block , u64, u64, u64, unsigned );
1da177e4 LT	210
	211	/* anode.c */
	212
	213	secno hpfs_bplus_lookup(struct super_block , struct inode , struct bplus_header , unsigned, struct buffer_head );
	214	secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
	215	void hpfs_remove_btree(struct super_block , struct bplus_header );
	216	int hpfs_ea_read(struct super_block , secno, int, unsigned, unsigned, char );
7e7742ee	217	int hpfs_ea_write(struct super_block , secno, int, unsigned, unsigned, const char );
1da177e4 LT	218	void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
	219	void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
	220	void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
	221
	222	/* buffer.c */
	223
a64eefaa MP	224	secno hpfs_search_hotfix_map(struct super_block *s, secno sec);
a64eefaa MP	225	unsigned hpfs_search_hotfix_map_for_range(struct super_block *s, secno sec, unsigned n);
275f495d	226	void hpfs_prefetch_sectors(struct super_block *, unsigned, int);
1da177e4 LT	227	void hpfs_map_sector(struct super_block , unsigned, struct buffer_head **, int);
	228	void hpfs_get_sector(struct super_block , unsigned, struct buffer_head **);
	229	void hpfs_map_4sectors(struct super_block , unsigned, struct quad_buffer_head *, int);
	230	void hpfs_get_4sectors(struct super_block , unsigned, struct quad_buffer_head *);
	231	void hpfs_brelse4(struct quad_buffer_head *);
	232	void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
	233
	234	/* dentry.c */
	235
43d344d7	236	extern const struct dentry_operations hpfs_dentry_operations;
1da177e4 LT	237
	238	/* dir.c */
	239
00cd8dd3	240	struct dentry hpfs_lookup(struct inode , struct dentry *, unsigned int);
4b6f5d20	241	extern const struct file_operations hpfs_dir_ops;
1da177e4 LT	242
	243	/* dnode.c */
	244
e82c3147	245	int hpfs_add_pos(struct inode , loff_t );
1da177e4	246	void hpfs_del_pos(struct inode , loff_t );
7e7742ee AV	247	struct hpfs_dirent hpfs_add_de(struct super_block , struct dnode *,
	248	const unsigned char *, unsigned, secno);
	249	int hpfs_add_dirent(struct inode , const unsigned char , unsigned,
7d23ce36	250	struct hpfs_dirent *);
1da177e4 LT	251	int hpfs_remove_dirent(struct inode , dnode_secno, struct hpfs_dirent , struct quad_buffer_head *, int);
	252	void hpfs_count_dnodes(struct super_block , dnode_secno, int , int , int );
	253	dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
	254	struct hpfs_dirent map_pos_dirent(struct inode , loff_t , struct quad_buffer_head );
7e7742ee AV	255	struct hpfs_dirent map_dirent(struct inode , dnode_secno,
	256	const unsigned char , unsigned, dnode_secno ,
	257	struct quad_buffer_head *);
1da177e4 LT	258	void hpfs_remove_dtree(struct super_block *, dnode_secno);
	259	struct hpfs_dirent map_fnode_dirent(struct super_block , fnode_secno, struct fnode , struct quad_buffer_head );
	260
	261	/* ea.c */
	262
	263	void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
	264	int hpfs_read_ea(struct super_block , struct fnode , char , char , int);
	265	char hpfs_get_ea(struct super_block , struct fnode , char , int *);
7e7742ee AV	266	void hpfs_set_ea(struct inode , struct fnode , const char *,
7e7742ee AV	267	const char *, int);
1da177e4 LT	268
	269	/* file.c */
	270
02c24a82	271	int hpfs_file_fsync(struct file *, loff_t, loff_t, int);
70b31c4c	272	void hpfs_truncate(struct inode *);
4b6f5d20	273	extern const struct file_operations hpfs_file_ops;
92e1d5be	274	extern const struct inode_operations hpfs_file_iops;
f5e54d6e	275	extern const struct address_space_operations hpfs_aops;
1da177e4 LT	276
	277	/* inode.c */
	278
	279	void hpfs_init_inode(struct inode *);
	280	void hpfs_read_inode(struct inode *);
	281	void hpfs_write_inode(struct inode *);
	282	void hpfs_write_inode_nolock(struct inode *);
549c7297	283	int hpfs_setattr(struct user_namespace , struct dentry , struct iattr *);
1da177e4	284	void hpfs_write_if_changed(struct inode *);
ea544009	285	void hpfs_evict_inode(struct inode *);
1da177e4 LT	286
	287	/* map.c */
	288
52576da3 AV	289	__le32 hpfs_map_dnode_bitmap(struct super_block , struct quad_buffer_head *);
52576da3 AV	290	__le32 hpfs_map_bitmap(struct super_block , unsigned, struct quad_buffer_head , char );
275f495d	291	void hpfs_prefetch_bitmap(struct super_block *, unsigned);
7e7742ee	292	unsigned char hpfs_load_code_page(struct super_block , secno);
28fe3c19	293	__le32 hpfs_load_bitmap_directory(struct super_block , secno bmp);
a64eefaa	294	void hpfs_load_hotfix_map(struct super_block s, struct hpfs_spare_block spareblock);
1da177e4 LT	295	struct fnode hpfs_map_fnode(struct super_block s, ino_t, struct buffer_head **);
	296	struct anode hpfs_map_anode(struct super_block s, anode_secno, struct buffer_head **);
	297	struct dnode hpfs_map_dnode(struct super_block s, dnode_secno, struct quad_buffer_head *);
	298	dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
	299
	300	/* name.c */
	301
	302	unsigned char hpfs_upcase(unsigned char *, unsigned char);
7e7742ee AV	303	int hpfs_chk_name(const unsigned char , unsigned );
	304	unsigned char hpfs_translate_name(struct super_block , unsigned char *, unsigned, int, int);
	305	int hpfs_compare_names(struct super_block , const unsigned char , unsigned,
	306	const unsigned char *, unsigned, int);
	307	int hpfs_is_name_long(const unsigned char *, unsigned);
	308	void hpfs_adjust_length(const unsigned char , unsigned );
1da177e4 LT	309
	310	/* namei.c */
	311
92e1d5be	312	extern const struct inode_operations hpfs_dir_iops;
f5e54d6e	313	extern const struct address_space_operations hpfs_symlink_aops;
1da177e4 LT	314
	315	static inline struct hpfs_inode_info hpfs_i(struct inode inode)
	316	{
db6172c4	317	return container_of(inode, struct hpfs_inode_info, vfs_inode);
1da177e4 LT	318	}
	319
	320	static inline struct hpfs_sb_info hpfs_sb(struct super_block sb)
	321	{
	322	return sb->s_fs_info;
	323	}
	324
	325	/* super.c */
	326
b9075fa9 JP	327	__printf(2, 3)
b9075fa9 JP	328	void hpfs_error(struct super_block , const char , ...);
1da177e4	329	int hpfs_stop_cycles(struct super_block , int, int , int , char );
2cbe5c76	330	unsigned hpfs_get_free_dnodes(struct super_block *);
a27b5b97	331	long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg);
1da177e4 LT	332
	333	/*
	334	* local time (HPFS) to GMT (Unix)
	335	*/
	336
cdd62b5b	337	static inline time64_t local_to_gmt(struct super_block *s, time64_t t)
1da177e4 LT	338	{
	339	extern struct timezone sys_tz;
	340	return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
	341	}
	342
f08957d0	343	static inline time32_t gmt_to_local(struct super_block *s, time64_t t)
1da177e4 LT	344	{
1da177e4 LT	345	extern struct timezone sys_tz;
cdd62b5b	346	return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
f08957d0 AB	347	}
	348
	349	static inline time32_t local_get_seconds(struct super_block *s)
	350	{
	351	return gmt_to_local(s, ktime_get_real_seconds());
1da177e4	352	}
9a311b96 AB	353
	354	/*
	355	* Locking:
	356	*
7dd29d8d MP	357	* hpfs_lock() locks the whole filesystem. It must be taken
7dd29d8d MP	358	* on any method called by the VFS.
9a311b96	359	*
7dd29d8d MP	360	* We don't do any per-file locking anymore, it is hard to
7dd29d8d MP	361	* review and HPFS is not performance-sensitive anyway.
9a311b96 AB	362	*/
	363	static inline void hpfs_lock(struct super_block *s)
	364	{
7dd29d8d MP	365	struct hpfs_sb_info *sbi = hpfs_sb(s);
7dd29d8d MP	366	mutex_lock(&sbi->hpfs_mutex);
9a311b96 AB	367	}
	368
	369	static inline void hpfs_unlock(struct super_block *s)
	370	{
7dd29d8d MP	371	struct hpfs_sb_info *sbi = hpfs_sb(s);
	372	mutex_unlock(&sbi->hpfs_mutex);
	373	}
	374
	375	static inline void hpfs_lock_assert(struct super_block *s)
	376	{
	377	struct hpfs_sb_info *sbi = hpfs_sb(s);
	378	WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex));
9a311b96	379	}