380 строки
13 KiB
C
380 строки
13 KiB
C
/* 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 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));
|
|
}
|