2 * linux/fs/hpfs/hpfs_fn.h
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
12 #include <linux/pagemap.h>
13 #include <linux/buffer_head.h>
14 #include <linux/hpfs_fs.h>
15 #include <linux/slab.h>
16 #include <linux/smp_lock.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 16
31 #define DNODE_RD_AHEAD 4
33 #define FREE_DNODES_ADD 58
34 #define FREE_DNODES_DEL 29
36 #define CHKCOND(x,y) if (!(x)) printk y
39 #define PRINTK(x) printk x
45 struct hpfs_inode_info
{
47 ino_t i_parent_dir
; /* (directories) gives fnode of parent dir */
48 unsigned i_dno
; /* (directories) root dnode */
49 unsigned i_dpos
; /* (directories) temp for readdir */
50 unsigned i_dsubdno
; /* (directories) temp for readdir */
51 unsigned i_file_sec
; /* (files) minimalist cache of alloc info */
52 unsigned i_disk_sec
; /* (files) minimalist cache of alloc info */
53 unsigned i_n_secs
; /* (files) minimalist cache of alloc info */
54 unsigned i_ea_size
; /* size of extended attributes */
55 unsigned i_conv
: 2; /* (files) crlf->newline hackery */
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 */
60 struct semaphore i_sem
;
61 struct semaphore i_parent
;
63 struct inode vfs_inode
;
67 ino_t sb_root
; /* inode number of root dir */
68 unsigned sb_fs_size
; /* file system size, sectors */
69 unsigned sb_bitmaps
; /* sector number of bitmap list */
70 unsigned sb_dirband_start
; /* directory band start sector */
71 unsigned sb_dirband_size
; /* directory band size, dnodes */
72 unsigned sb_dmap
; /* sector number of dnode bit map */
73 unsigned sb_n_free
; /* free blocks for statfs, or -1 */
74 unsigned sb_n_free_dnodes
; /* free dnodes for statfs, or -1 */
75 uid_t sb_uid
; /* uid from mount options */
76 gid_t sb_gid
; /* gid from mount options */
77 umode_t sb_mode
; /* mode from mount options */
78 unsigned sb_conv
: 2; /* crlf->newline hackery */
79 unsigned sb_eas
: 2; /* eas: 0-ignore, 1-ro, 2-rw */
80 unsigned sb_err
: 2; /* on errs: 0-cont, 1-ro, 2-panic */
81 unsigned sb_chk
: 2; /* checks: 0-no, 1-normal, 2-strict */
82 unsigned sb_lowercase
: 1; /* downcase filenames hackery */
83 unsigned sb_was_error
: 1; /* there was an error, set dirty flag */
84 unsigned sb_chkdsk
: 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
85 unsigned char *sb_cp_table
; /* code page tables: */
86 /* 128 bytes uppercasing table & */
87 /* 128 bytes lowercasing table */
88 unsigned *sb_bmp_dir
; /* main bitmap directory */
89 unsigned sb_c_bitmap
; /* current bitmap */
90 unsigned sb_max_fwd_alloc
; /* max forwad allocation */
91 struct semaphore hpfs_creation_de
; /* when creating dirents, nobody else
93 /*unsigned sb_mounting : 1;*/
101 #define CONV_BINARY 0 /* no conversion */
102 #define CONV_TEXT 1 /* crlf->newline */
103 #define CONV_AUTO 2 /* decide based on file contents */
105 /* Four 512-byte buffers and the 2k block obtained by concatenating them */
107 struct quad_buffer_head
{
108 struct buffer_head
*bh
[4];
112 /* The b-tree down pointer from a dir entry */
114 static inline dnode_secno
de_down_pointer (struct hpfs_dirent
*de
)
116 CHKCOND(de
->down
,("HPFS: de_down_pointer: !de->down\n"));
117 return *(dnode_secno
*) ((void *) de
+ de
->length
- 4);
120 /* The first dir entry in a dnode */
122 static inline struct hpfs_dirent
*dnode_first_de (struct dnode
*dnode
)
124 return (void *) dnode
->dirent
;
127 /* The end+1 of the dir entries */
129 static inline struct hpfs_dirent
*dnode_end_de (struct dnode
*dnode
)
131 CHKCOND(dnode
->first_free
>=0x14 && dnode
->first_free
<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode
->first_free
));
132 return (void *) dnode
+ dnode
->first_free
;
135 /* The dir entry after dir entry de */
137 static inline struct hpfs_dirent
*de_next_de (struct hpfs_dirent
*de
)
139 CHKCOND(de
->length
>=0x20 && de
->length
<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de
->length
));
140 return (void *) de
+ de
->length
;
143 static inline struct extended_attribute
*fnode_ea(struct fnode
*fnode
)
145 return (struct extended_attribute
*)((char *)fnode
+ fnode
->ea_offs
+ fnode
->acl_size_s
);
148 static inline struct extended_attribute
*fnode_end_ea(struct fnode
*fnode
)
150 return (struct extended_attribute
*)((char *)fnode
+ fnode
->ea_offs
+ fnode
->acl_size_s
+ fnode
->ea_size_s
);
153 static inline struct extended_attribute
*next_ea(struct extended_attribute
*ea
)
155 return (struct extended_attribute
*)((char *)ea
+ 5 + ea
->namelen
+ ea
->valuelen
);
158 static inline secno
ea_sec(struct extended_attribute
*ea
)
160 return *(secno
*)((char *)ea
+ 9 + ea
->namelen
);
163 static inline secno
ea_len(struct extended_attribute
*ea
)
165 return *(secno
*)((char *)ea
+ 5 + ea
->namelen
);
168 static inline char *ea_data(struct extended_attribute
*ea
)
170 return (char *)((char *)ea
+ 5 + ea
->namelen
);
173 static inline unsigned de_size(int namelen
, secno down_ptr
)
175 return ((0x1f + namelen
+ 3) & ~3) + (down_ptr
? 4 : 0);
178 static inline void copy_de(struct hpfs_dirent
*dst
, struct hpfs_dirent
*src
)
182 if (!dst
|| !src
) return;
185 memcpy((char *)dst
+ 2, (char *)src
+ 2, 28);
190 static inline unsigned tstbits(unsigned *bmp
, unsigned b
, unsigned n
)
193 if ((b
>= 0x4000) || (b
+ n
- 1 >= 0x4000)) return n
;
194 if (!((bmp
[(b
& 0x3fff) >> 5] >> (b
& 0x1f)) & 1)) return 1;
195 for (i
= 1; i
< n
; i
++)
196 if (/*b+i < 0x4000 &&*/ !((bmp
[((b
+i
) & 0x3fff) >> 5] >> ((b
+i
) & 0x1f)) & 1))
203 int hpfs_chk_sectors(struct super_block
*, secno
, int, char *);
204 secno
hpfs_alloc_sector(struct super_block
*, secno
, unsigned, int, int);
205 int hpfs_alloc_if_possible_nolock(struct super_block
*, secno
);
206 int hpfs_alloc_if_possible(struct super_block
*, secno
);
207 void hpfs_free_sectors(struct super_block
*, secno
, unsigned);
208 int hpfs_check_free_dnodes(struct super_block
*, int);
209 void hpfs_free_dnode(struct super_block
*, secno
);
210 struct dnode
*hpfs_alloc_dnode(struct super_block
*, secno
, dnode_secno
*, struct quad_buffer_head
*, int);
211 struct fnode
*hpfs_alloc_fnode(struct super_block
*, secno
, fnode_secno
*, struct buffer_head
**);
212 struct anode
*hpfs_alloc_anode(struct super_block
*, secno
, anode_secno
*, struct buffer_head
**);
216 secno
hpfs_bplus_lookup(struct super_block
*, struct inode
*, struct bplus_header
*, unsigned, struct buffer_head
*);
217 secno
hpfs_add_sector_to_btree(struct super_block
*, secno
, int, unsigned);
218 void hpfs_remove_btree(struct super_block
*, struct bplus_header
*);
219 int hpfs_ea_read(struct super_block
*, secno
, int, unsigned, unsigned, char *);
220 int hpfs_ea_write(struct super_block
*, secno
, int, unsigned, unsigned, char *);
221 void hpfs_ea_remove(struct super_block
*, secno
, int, unsigned);
222 void hpfs_truncate_btree(struct super_block
*, secno
, int, unsigned);
223 void hpfs_remove_fnode(struct super_block
*, fnode_secno fno
);
227 void hpfs_lock_creation(struct super_block
*);
228 void hpfs_unlock_creation(struct super_block
*);
229 void *hpfs_map_sector(struct super_block
*, unsigned, struct buffer_head
**, int);
230 void *hpfs_get_sector(struct super_block
*, unsigned, struct buffer_head
**);
231 void *hpfs_map_4sectors(struct super_block
*, unsigned, struct quad_buffer_head
*, int);
232 void *hpfs_get_4sectors(struct super_block
*, unsigned, struct quad_buffer_head
*);
233 void hpfs_brelse4(struct quad_buffer_head
*);
234 void hpfs_mark_4buffers_dirty(struct quad_buffer_head
*);
238 void hpfs_set_dentry_operations(struct dentry
*);
242 struct dentry
*hpfs_lookup(struct inode
*, struct dentry
*, struct nameidata
*);
243 extern struct file_operations hpfs_dir_ops
;
247 void hpfs_add_pos(struct inode
*, loff_t
*);
248 void hpfs_del_pos(struct inode
*, loff_t
*);
249 struct hpfs_dirent
*hpfs_add_de(struct super_block
*, struct dnode
*, unsigned char *, unsigned, secno
);
250 void hpfs_delete_de(struct super_block
*, struct dnode
*, struct hpfs_dirent
*);
251 int hpfs_add_to_dnode(struct inode
*, dnode_secno
, unsigned char *, unsigned, struct hpfs_dirent
*, dnode_secno
);
252 int hpfs_add_dirent(struct inode
*, unsigned char *, unsigned, struct hpfs_dirent
*, int);
253 int hpfs_remove_dirent(struct inode
*, dnode_secno
, struct hpfs_dirent
*, struct quad_buffer_head
*, int);
254 void hpfs_count_dnodes(struct super_block
*, dnode_secno
, int *, int *, int *);
255 dnode_secno
hpfs_de_as_down_as_possible(struct super_block
*, dnode_secno dno
);
256 struct hpfs_dirent
*map_pos_dirent(struct inode
*, loff_t
*, struct quad_buffer_head
*);
257 struct hpfs_dirent
*map_dirent(struct inode
*, dnode_secno
, char *, unsigned, dnode_secno
*, struct quad_buffer_head
*);
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
*);
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 *);
266 void hpfs_set_ea(struct inode
*, struct fnode
*, char *, char *, int);
270 int hpfs_file_fsync(struct file
*, struct dentry
*, int);
271 extern struct file_operations hpfs_file_ops
;
272 extern struct inode_operations hpfs_file_iops
;
273 extern struct address_space_operations hpfs_aops
;
277 void hpfs_init_inode(struct inode
*);
278 void hpfs_read_inode(struct inode
*);
279 void hpfs_write_inode_ea(struct inode
*, struct fnode
*);
280 void hpfs_write_inode(struct inode
*);
281 void hpfs_write_inode_nolock(struct inode
*);
282 int hpfs_notify_change(struct dentry
*, struct iattr
*);
283 void hpfs_write_if_changed(struct inode
*);
284 void hpfs_delete_inode(struct inode
*);
288 unsigned *hpfs_map_dnode_bitmap(struct super_block
*, struct quad_buffer_head
*);
289 unsigned *hpfs_map_bitmap(struct super_block
*, unsigned, struct quad_buffer_head
*, char *);
290 char *hpfs_load_code_page(struct super_block
*, secno
);
291 secno
*hpfs_load_bitmap_directory(struct super_block
*, secno bmp
);
292 struct fnode
*hpfs_map_fnode(struct super_block
*s
, ino_t
, struct buffer_head
**);
293 struct anode
*hpfs_map_anode(struct super_block
*s
, anode_secno
, struct buffer_head
**);
294 struct dnode
*hpfs_map_dnode(struct super_block
*s
, dnode_secno
, struct quad_buffer_head
*);
295 dnode_secno
hpfs_fnode_dno(struct super_block
*s
, ino_t ino
);
299 unsigned char hpfs_upcase(unsigned char *, unsigned char);
300 int hpfs_chk_name(unsigned char *, unsigned *);
301 char *hpfs_translate_name(struct super_block
*, unsigned char *, unsigned, int, int);
302 int hpfs_compare_names(struct super_block
*, unsigned char *, unsigned, unsigned char *, unsigned, int);
303 int hpfs_is_name_long(unsigned char *, unsigned);
304 void hpfs_adjust_length(unsigned char *, unsigned *);
305 void hpfs_decide_conv(struct inode
*, unsigned char *, unsigned);
309 extern struct inode_operations hpfs_dir_iops
;
310 extern struct address_space_operations hpfs_symlink_aops
;
312 static inline struct hpfs_inode_info
*hpfs_i(struct inode
*inode
)
314 return list_entry(inode
, struct hpfs_inode_info
, vfs_inode
);
317 static inline struct hpfs_sb_info
*hpfs_sb(struct super_block
*sb
)
319 return sb
->s_fs_info
;
324 void hpfs_error(struct super_block
*, char *, ...);
325 int hpfs_stop_cycles(struct super_block
*, int, int *, int *, char *);
326 unsigned hpfs_count_one_bitmap(struct super_block
*, secno
);
329 * local time (HPFS) to GMT (Unix)
332 static inline time_t local_to_gmt(struct super_block
*s
, time_t t
)
334 extern struct timezone sys_tz
;
335 return t
+ sys_tz
.tz_minuteswest
* 60 + hpfs_sb(s
)->sb_timeshift
;
338 static inline time_t gmt_to_local(struct super_block
*s
, time_t t
)
340 extern struct timezone sys_tz
;
341 return t
- sys_tz
.tz_minuteswest
* 60 - hpfs_sb(s
)->sb_timeshift
;