Release 4.17 fs/hpfs/hpfs_fn.h

Directory: fs/hpfs
/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  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/signal.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;

	
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));
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 41 83.67% 1 25.00%
Mikulas Patocka 6 12.24% 1 25.00%
Al Viro 1 2.04% 1 25.00%
Dave Jones 1 2.04% 1 25.00%
Total 49 100.00% 4 100.00%

/* The first dir entry in a dnode */



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

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 22 95.65% 1 50.00%
Dave Jones 1 4.35% 1 50.00%
Total 23 100.00% 2 100.00%

/* 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);
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 48 76.19% 1 33.33%
Mikulas Patocka 14 22.22% 1 33.33%
Dave Jones 1 1.59% 1 33.33%
Total 63 100.00% 3 100.00%

/* 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);
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 48 76.19% 1 33.33%
Mikulas Patocka 14 22.22% 1 33.33%
Dave Jones 1 1.59% 1 33.33%
Total 63 100.00% 3 100.00%



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));
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 31 73.81% 1 25.00%
Mikulas Patocka 10 23.81% 2 50.00%
Dave Jones 1 2.38% 1 25.00%
Total 42 100.00% 4 100.00%



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));
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 35 71.43% 1 25.00%
Mikulas Patocka 13 26.53% 2 50.00%
Dave Jones 1 2.04% 1 25.00%
Total 49 100.00% 4 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Mikulas Patocka 22 100.00% 1 100.00%
Total 22 100.00% 1 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 35 89.74% 1 25.00%
Mikulas Patocka 3 7.69% 2 50.00%
Dave Jones 1 2.56% 1 25.00%
Total 39 100.00% 4 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 28 75.68% 1 20.00%
Mikulas Patocka 7 18.92% 2 40.00%
Al Viro 1 2.70% 1 20.00%
Dave Jones 1 2.70% 1 20.00%
Total 37 100.00% 5 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 28 75.68% 1 20.00%
Mikulas Patocka 7 18.92% 2 40.00%
Dave Jones 1 2.70% 1 20.00%
Al Viro 1 2.70% 1 20.00%
Total 37 100.00% 5 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 31 96.88% 1 50.00%
Dave Jones 1 3.12% 1 50.00%
Total 32 100.00% 2 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 34 97.14% 1 50.00%
Dave Jones 1 2.86% 1 50.00%
Total 35 100.00% 2 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 64 83.12% 1 50.00%
Dave Jones 13 16.88% 1 50.00%
Total 77 100.00% 2 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 123 93.89% 1 25.00%
Mikulas Patocka 6 4.58% 1 25.00%
Al Viro 1 0.76% 1 25.00%
Dave Jones 1 0.76% 1 25.00%
Total 131 100.00% 4 100.00%

/* 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 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);
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds 24 96.00% 1 50.00%
Rasmus Villemoes 1 4.00% 1 50.00%
Total 25 100.00% 2 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Brian Gerst 19 100.00% 2 100.00%
Total 19 100.00% 2 100.00%

/* 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;
}

Contributors
Person Tokens Prop Commits CommitProp
Brian Gerst 34 94.44% 1 33.33%
Dave Jones 1 2.78% 1 33.33%
relf@os2.ru 1 2.78% 1 33.33%
Total 36 100.00% 3 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Brian Gerst 34 94.44% 1 33.33%
relf@os2.ru 1 2.78% 1 33.33%
Dave Jones 1 2.78% 1 33.33%
Total 36 100.00% 3 100.00%

/*
 * 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);
}

Contributors
Person Tokens Prop Commits CommitProp
Mikulas Patocka 20 66.67% 1 50.00%
Arnd Bergmann 10 33.33% 1 50.00%
Total 30 100.00% 2 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Mikulas Patocka 20 66.67% 1 50.00%
Arnd Bergmann 10 33.33% 1 50.00%
Total 30 100.00% 2 100.00%



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));
}
Contributors
Person Tokens Prop Commits CommitProp
Mikulas Patocka 34 100.00% 1 100.00%
Total 34 100.00% 1 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 1583 67.25% 6 12.24%
Mikulas Patocka 312 13.25% 8 16.33%
Al Viro 244 10.37% 12 24.49%
Brian Gerst 88 3.74% 2 4.08%
Dave Jones 27 1.15% 1 2.04%
Linus Torvalds 25 1.06% 2 4.08%
Arnd Bergmann 20 0.85% 1 2.04%
Fabian Frederick 15 0.64% 1 2.04%
Marco Stornelli 8 0.34% 1 2.04%
Joe Perches 7 0.30% 1 2.04%
Christoph Hellwig 5 0.21% 3 6.12%
Josef Bacik 4 0.17% 1 2.04%
Arjan van de Ven 4 0.17% 2 4.08%
Ingo Molnar 4 0.17% 2 4.08%
relf@os2.ru 2 0.08% 1 2.04%
Eric W. Biedermann 2 0.08% 1 2.04%
Trond Myklebust 1 0.04% 1 2.04%
Alexey Dobriyan 1 0.04% 1 2.04%
Rasmus Villemoes 1 0.04% 1 2.04%
Greg Kroah-Hartman 1 0.04% 1 2.04%
Total 2354 100.00% 49 100.00%
Directory: fs/hpfs

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Linus Torvalds (pre-git)	41	83.67%	1	25.00%
Mikulas Patocka	6	12.24%	1	25.00%
Al Viro	1	2.04%	1	25.00%
Dave Jones	1	2.04%	1	25.00%
Total	49	100.00%	4	100.00%
cregit-Linux how code gets into the kernel

Release 4.17 fs/hpfs/hpfs_fn.h

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