2 * linux/fs/hpfs/hpfs_fn.h
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
12 #include <linux/mutex.h>
13 #include <linux/pagemap.h>
14 #include <linux/buffer_head.h>
15 #include <linux/slab.h>
16 #include <asm/unaligned.h>
21 #define EFSERROR EPERM
22 #define EMEMERROR ENOMEM
24 #define ANODE_ALLOC_FWD 512
25 #define FNODE_ALLOC_FWD 0
26 #define ALLOC_FWD_MIN 16
27 #define ALLOC_FWD_MAX 128
29 #define FNODE_RD_AHEAD 16
30 #define ANODE_RD_AHEAD 0
31 #define DNODE_RD_AHEAD 72
32 #define COUNT_RD_AHEAD 62
34 #define FREE_DNODES_ADD 58
35 #define FREE_DNODES_DEL 29
37 #define CHKCOND(x,y) if (!(x)) printk y
39 struct hpfs_inode_info
{
41 ino_t i_parent_dir
; /* (directories) gives fnode of parent dir */
42 unsigned i_dno
; /* (directories) root dnode */
43 unsigned i_dpos
; /* (directories) temp for readdir */
44 unsigned i_dsubdno
; /* (directories) temp for readdir */
45 unsigned i_file_sec
; /* (files) minimalist cache of alloc info */
46 unsigned i_disk_sec
; /* (files) minimalist cache of alloc info */
47 unsigned i_n_secs
; /* (files) minimalist cache of alloc info */
48 unsigned i_ea_size
; /* size of extended attributes */
49 unsigned i_ea_mode
: 1; /* file's permission is stored in ea */
50 unsigned i_ea_uid
: 1; /* file's uid is stored in ea */
51 unsigned i_ea_gid
: 1; /* file's gid is stored in ea */
54 struct inode vfs_inode
;
58 struct mutex hpfs_mutex
; /* global hpfs lock */
59 ino_t sb_root
; /* inode number of root dir */
60 unsigned sb_fs_size
; /* file system size, sectors */
61 unsigned sb_bitmaps
; /* sector number of bitmap list */
62 unsigned sb_dirband_start
; /* directory band start sector */
63 unsigned sb_dirband_size
; /* directory band size, dnodes */
64 unsigned sb_dmap
; /* sector number of dnode bit map */
65 unsigned sb_n_free
; /* free blocks for statfs, or -1 */
66 unsigned sb_n_free_dnodes
; /* free dnodes for statfs, or -1 */
67 kuid_t sb_uid
; /* uid from mount options */
68 kgid_t sb_gid
; /* gid from mount options */
69 umode_t sb_mode
; /* mode from mount options */
70 unsigned sb_eas
: 2; /* eas: 0-ignore, 1-ro, 2-rw */
71 unsigned sb_err
: 2; /* on errs: 0-cont, 1-ro, 2-panic */
72 unsigned sb_chk
: 2; /* checks: 0-no, 1-normal, 2-strict */
73 unsigned sb_lowercase
: 1; /* downcase filenames hackery */
74 unsigned sb_was_error
: 1; /* there was an error, set dirty flag */
75 unsigned sb_chkdsk
: 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
76 unsigned char *sb_cp_table
; /* code page tables: */
77 /* 128 bytes uppercasing table & */
78 /* 128 bytes lowercasing table */
79 __le32
*sb_bmp_dir
; /* main bitmap directory */
80 unsigned sb_c_bitmap
; /* current bitmap */
81 unsigned sb_max_fwd_alloc
; /* max forwad allocation */
86 /* Four 512-byte buffers and the 2k block obtained by concatenating them */
88 struct quad_buffer_head
{
89 struct buffer_head
*bh
[4];
93 /* The b-tree down pointer from a dir entry */
95 static inline dnode_secno
de_down_pointer (struct hpfs_dirent
*de
)
97 CHKCOND(de
->down
,("HPFS: de_down_pointer: !de->down\n"));
98 return le32_to_cpu(*(__le32
*) ((void *) de
+ le16_to_cpu(de
->length
) - 4));
101 /* The first dir entry in a dnode */
103 static inline struct hpfs_dirent
*dnode_first_de (struct dnode
*dnode
)
105 return (void *) dnode
->dirent
;
108 /* The end+1 of the dir entries */
110 static inline struct hpfs_dirent
*dnode_end_de (struct dnode
*dnode
)
112 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
)));
113 return (void *) dnode
+ le32_to_cpu(dnode
->first_free
);
116 /* The dir entry after dir entry de */
118 static inline struct hpfs_dirent
*de_next_de (struct hpfs_dirent
*de
)
120 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
)));
121 return (void *) de
+ le16_to_cpu(de
->length
);
124 static inline struct extended_attribute
*fnode_ea(struct fnode
*fnode
)
126 return (struct extended_attribute
*)((char *)fnode
+ le16_to_cpu(fnode
->ea_offs
) + le16_to_cpu(fnode
->acl_size_s
));
129 static inline struct extended_attribute
*fnode_end_ea(struct fnode
*fnode
)
131 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
));
134 static unsigned ea_valuelen(struct extended_attribute
*ea
)
136 return ea
->valuelen_lo
+ 256 * ea
->valuelen_hi
;
139 static inline struct extended_attribute
*next_ea(struct extended_attribute
*ea
)
141 return (struct extended_attribute
*)((char *)ea
+ 5 + ea
->namelen
+ ea_valuelen(ea
));
144 static inline secno
ea_sec(struct extended_attribute
*ea
)
146 return le32_to_cpu(get_unaligned((__le32
*)((char *)ea
+ 9 + ea
->namelen
)));
149 static inline secno
ea_len(struct extended_attribute
*ea
)
151 return le32_to_cpu(get_unaligned((__le32
*)((char *)ea
+ 5 + ea
->namelen
)));
154 static inline char *ea_data(struct extended_attribute
*ea
)
156 return (char *)((char *)ea
+ 5 + ea
->namelen
);
159 static inline unsigned de_size(int namelen
, secno down_ptr
)
161 return ((0x1f + namelen
+ 3) & ~3) + (down_ptr
? 4 : 0);
164 static inline void copy_de(struct hpfs_dirent
*dst
, struct hpfs_dirent
*src
)
168 if (!dst
|| !src
) return;
171 memcpy((char *)dst
+ 2, (char *)src
+ 2, 28);
176 static inline unsigned tstbits(__le32
*bmp
, unsigned b
, unsigned n
)
179 if ((b
>= 0x4000) || (b
+ n
- 1 >= 0x4000)) return n
;
180 if (!((le32_to_cpu(bmp
[(b
& 0x3fff) >> 5]) >> (b
& 0x1f)) & 1)) return 1;
181 for (i
= 1; i
< n
; i
++)
182 if (!((le32_to_cpu(bmp
[((b
+i
) & 0x3fff) >> 5]) >> ((b
+i
) & 0x1f)) & 1))
189 int hpfs_chk_sectors(struct super_block
*, secno
, int, char *);
190 secno
hpfs_alloc_sector(struct super_block
*, secno
, unsigned, int);
191 int hpfs_alloc_if_possible(struct super_block
*, secno
);
192 void hpfs_free_sectors(struct super_block
*, secno
, unsigned);
193 int hpfs_check_free_dnodes(struct super_block
*, int);
194 void hpfs_free_dnode(struct super_block
*, secno
);
195 struct dnode
*hpfs_alloc_dnode(struct super_block
*, secno
, dnode_secno
*, struct quad_buffer_head
*);
196 struct fnode
*hpfs_alloc_fnode(struct super_block
*, secno
, fnode_secno
*, struct buffer_head
**);
197 struct anode
*hpfs_alloc_anode(struct super_block
*, secno
, anode_secno
*, struct buffer_head
**);
201 secno
hpfs_bplus_lookup(struct super_block
*, struct inode
*, struct bplus_header
*, unsigned, struct buffer_head
*);
202 secno
hpfs_add_sector_to_btree(struct super_block
*, secno
, int, unsigned);
203 void hpfs_remove_btree(struct super_block
*, struct bplus_header
*);
204 int hpfs_ea_read(struct super_block
*, secno
, int, unsigned, unsigned, char *);
205 int hpfs_ea_write(struct super_block
*, secno
, int, unsigned, unsigned, const char *);
206 void hpfs_ea_remove(struct super_block
*, secno
, int, unsigned);
207 void hpfs_truncate_btree(struct super_block
*, secno
, int, unsigned);
208 void hpfs_remove_fnode(struct super_block
*, fnode_secno fno
);
212 void hpfs_prefetch_sectors(struct super_block
*, unsigned, int);
213 void *hpfs_map_sector(struct super_block
*, unsigned, struct buffer_head
**, int);
214 void *hpfs_get_sector(struct super_block
*, unsigned, struct buffer_head
**);
215 void *hpfs_map_4sectors(struct super_block
*, unsigned, struct quad_buffer_head
*, int);
216 void *hpfs_get_4sectors(struct super_block
*, unsigned, struct quad_buffer_head
*);
217 void hpfs_brelse4(struct quad_buffer_head
*);
218 void hpfs_mark_4buffers_dirty(struct quad_buffer_head
*);
222 extern const struct dentry_operations hpfs_dentry_operations
;
226 struct dentry
*hpfs_lookup(struct inode
*, struct dentry
*, unsigned int);
227 extern const struct file_operations hpfs_dir_ops
;
231 void hpfs_add_pos(struct inode
*, loff_t
*);
232 void hpfs_del_pos(struct inode
*, loff_t
*);
233 struct hpfs_dirent
*hpfs_add_de(struct super_block
*, struct dnode
*,
234 const unsigned char *, unsigned, secno
);
235 int hpfs_add_dirent(struct inode
*, const unsigned char *, unsigned,
236 struct hpfs_dirent
*);
237 int hpfs_remove_dirent(struct inode
*, dnode_secno
, struct hpfs_dirent
*, struct quad_buffer_head
*, int);
238 void hpfs_count_dnodes(struct super_block
*, dnode_secno
, int *, int *, int *);
239 dnode_secno
hpfs_de_as_down_as_possible(struct super_block
*, dnode_secno dno
);
240 struct hpfs_dirent
*map_pos_dirent(struct inode
*, loff_t
*, struct quad_buffer_head
*);
241 struct hpfs_dirent
*map_dirent(struct inode
*, dnode_secno
,
242 const unsigned char *, unsigned, dnode_secno
*,
243 struct quad_buffer_head
*);
244 void hpfs_remove_dtree(struct super_block
*, dnode_secno
);
245 struct hpfs_dirent
*map_fnode_dirent(struct super_block
*, fnode_secno
, struct fnode
*, struct quad_buffer_head
*);
249 void hpfs_ea_ext_remove(struct super_block
*, secno
, int, unsigned);
250 int hpfs_read_ea(struct super_block
*, struct fnode
*, char *, char *, int);
251 char *hpfs_get_ea(struct super_block
*, struct fnode
*, char *, int *);
252 void hpfs_set_ea(struct inode
*, struct fnode
*, const char *,
257 int hpfs_file_fsync(struct file
*, loff_t
, loff_t
, int);
258 void hpfs_truncate(struct inode
*);
259 extern const struct file_operations hpfs_file_ops
;
260 extern const struct inode_operations hpfs_file_iops
;
261 extern const struct address_space_operations hpfs_aops
;
265 void hpfs_init_inode(struct inode
*);
266 void hpfs_read_inode(struct inode
*);
267 void hpfs_write_inode(struct inode
*);
268 void hpfs_write_inode_nolock(struct inode
*);
269 int hpfs_setattr(struct dentry
*, struct iattr
*);
270 void hpfs_write_if_changed(struct inode
*);
271 void hpfs_evict_inode(struct inode
*);
275 __le32
*hpfs_map_dnode_bitmap(struct super_block
*, struct quad_buffer_head
*);
276 __le32
*hpfs_map_bitmap(struct super_block
*, unsigned, struct quad_buffer_head
*, char *);
277 void hpfs_prefetch_bitmap(struct super_block
*, unsigned);
278 unsigned char *hpfs_load_code_page(struct super_block
*, secno
);
279 __le32
*hpfs_load_bitmap_directory(struct super_block
*, secno bmp
);
280 struct fnode
*hpfs_map_fnode(struct super_block
*s
, ino_t
, struct buffer_head
**);
281 struct anode
*hpfs_map_anode(struct super_block
*s
, anode_secno
, struct buffer_head
**);
282 struct dnode
*hpfs_map_dnode(struct super_block
*s
, dnode_secno
, struct quad_buffer_head
*);
283 dnode_secno
hpfs_fnode_dno(struct super_block
*s
, ino_t ino
);
287 unsigned char hpfs_upcase(unsigned char *, unsigned char);
288 int hpfs_chk_name(const unsigned char *, unsigned *);
289 unsigned char *hpfs_translate_name(struct super_block
*, unsigned char *, unsigned, int, int);
290 int hpfs_compare_names(struct super_block
*, const unsigned char *, unsigned,
291 const unsigned char *, unsigned, int);
292 int hpfs_is_name_long(const unsigned char *, unsigned);
293 void hpfs_adjust_length(const unsigned char *, unsigned *);
297 extern const struct inode_operations hpfs_dir_iops
;
298 extern const struct address_space_operations hpfs_symlink_aops
;
300 static inline struct hpfs_inode_info
*hpfs_i(struct inode
*inode
)
302 return list_entry(inode
, struct hpfs_inode_info
, vfs_inode
);
305 static inline struct hpfs_sb_info
*hpfs_sb(struct super_block
*sb
)
307 return sb
->s_fs_info
;
313 void hpfs_error(struct super_block
*, const char *, ...);
314 int hpfs_stop_cycles(struct super_block
*, int, int *, int *, char *);
315 unsigned hpfs_get_free_dnodes(struct super_block
*);
318 * local time (HPFS) to GMT (Unix)
321 static inline time_t local_to_gmt(struct super_block
*s
, time32_t t
)
323 extern struct timezone sys_tz
;
324 return t
+ sys_tz
.tz_minuteswest
* 60 + hpfs_sb(s
)->sb_timeshift
;
327 static inline time32_t
gmt_to_local(struct super_block
*s
, time_t t
)
329 extern struct timezone sys_tz
;
330 return t
- sys_tz
.tz_minuteswest
* 60 - hpfs_sb(s
)->sb_timeshift
;
336 * hpfs_lock() locks the whole filesystem. It must be taken
337 * on any method called by the VFS.
339 * We don't do any per-file locking anymore, it is hard to
340 * review and HPFS is not performance-sensitive anyway.
342 static inline void hpfs_lock(struct super_block
*s
)
344 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
345 mutex_lock(&sbi
->hpfs_mutex
);
348 static inline void hpfs_unlock(struct super_block
*s
)
350 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
351 mutex_unlock(&sbi
->hpfs_mutex
);
354 static inline void hpfs_lock_assert(struct super_block
*s
)
356 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
357 WARN_ON(!mutex_is_locked(&sbi
->hpfs_mutex
));