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>
20 #define EFSERROR EPERM
21 #define EMEMERROR ENOMEM
23 #define ANODE_ALLOC_FWD 512
24 #define FNODE_ALLOC_FWD 0
25 #define ALLOC_FWD_MIN 16
26 #define ALLOC_FWD_MAX 128
28 #define FNODE_RD_AHEAD 16
29 #define ANODE_RD_AHEAD 16
30 #define DNODE_RD_AHEAD 4
32 #define FREE_DNODES_ADD 58
33 #define FREE_DNODES_DEL 29
35 #define CHKCOND(x,y) if (!(x)) printk y
38 #define PRINTK(x) printk x
44 struct hpfs_inode_info {
46 ino_t i_parent_dir; /* (directories) gives fnode of parent dir */
47 unsigned i_dno; /* (directories) root dnode */
48 unsigned i_dpos; /* (directories) temp for readdir */
49 unsigned i_dsubdno; /* (directories) temp for readdir */
50 unsigned i_file_sec; /* (files) minimalist cache of alloc info */
51 unsigned i_disk_sec; /* (files) minimalist cache of alloc info */
52 unsigned i_n_secs; /* (files) minimalist cache of alloc info */
53 unsigned i_ea_size; /* size of extended attributes */
54 unsigned i_conv : 2; /* (files) crlf->newline hackery */
55 unsigned i_ea_mode : 1; /* file's permission is stored in ea */
56 unsigned i_ea_uid : 1; /* file's uid is stored in ea */
57 unsigned i_ea_gid : 1; /* file's gid is stored in ea */
60 struct mutex i_parent_mutex;
62 struct inode vfs_inode;
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 */
74 uid_t sb_uid; /* uid from mount options */
75 gid_t sb_gid; /* gid from mount options */
76 umode_t sb_mode; /* mode from mount options */
77 unsigned sb_conv : 2; /* crlf->newline hackery */
78 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
79 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
80 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
81 unsigned sb_lowercase : 1; /* downcase filenames hackery */
82 unsigned sb_was_error : 1; /* there was an error, set dirty flag */
83 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
84 unsigned char *sb_cp_table; /* code page tables: */
85 /* 128 bytes uppercasing table & */
86 /* 128 bytes lowercasing table */
87 unsigned *sb_bmp_dir; /* main bitmap directory */
88 unsigned sb_c_bitmap; /* current bitmap */
89 unsigned sb_max_fwd_alloc; /* max forwad allocation */
90 struct semaphore hpfs_creation_de; /* when creating dirents, nobody else
92 /*unsigned sb_mounting : 1;*/
100 #define CONV_BINARY 0 /* no conversion */
101 #define CONV_TEXT 1 /* crlf->newline */
102 #define CONV_AUTO 2 /* decide based on file contents */
104 /* Four 512-byte buffers and the 2k block obtained by concatenating them */
106 struct quad_buffer_head {
107 struct buffer_head *bh[4];
111 /* The b-tree down pointer from a dir entry */
113 static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
115 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
116 return *(dnode_secno *) ((void *) de + de->length - 4);
119 /* The first dir entry in a dnode */
121 static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
123 return (void *) dnode->dirent;
126 /* The end+1 of the dir entries */
128 static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
130 CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free));
131 return (void *) dnode + dnode->first_free;
134 /* The dir entry after dir entry de */
136 static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
138 CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length));
139 return (void *) de + de->length;
142 static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
144 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s);
147 static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
149 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s);
152 static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
154 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen);
157 static inline secno ea_sec(struct extended_attribute *ea)
159 return *(secno *)((char *)ea + 9 + ea->namelen);
162 static inline secno ea_len(struct extended_attribute *ea)
164 return *(secno *)((char *)ea + 5 + ea->namelen);
167 static inline char *ea_data(struct extended_attribute *ea)
169 return (char *)((char *)ea + 5 + ea->namelen);
172 static inline unsigned de_size(int namelen, secno down_ptr)
174 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
177 static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
181 if (!dst || !src) return;
184 memcpy((char *)dst + 2, (char *)src + 2, 28);
189 static inline unsigned tstbits(unsigned *bmp, unsigned b, unsigned n)
192 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
193 if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1;
194 for (i = 1; i < n; i++)
195 if (/*b+i < 0x4000 &&*/ !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1))
202 int hpfs_chk_sectors(struct super_block *, secno, int, char *);
203 secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int);
204 int hpfs_alloc_if_possible(struct super_block *, secno);
205 void hpfs_free_sectors(struct super_block *, secno, unsigned);
206 int hpfs_check_free_dnodes(struct super_block *, int);
207 void hpfs_free_dnode(struct super_block *, secno);
208 struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int);
209 struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
210 struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
214 secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
215 secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
216 void hpfs_remove_btree(struct super_block *, struct bplus_header *);
217 int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
218 int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *);
219 void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
220 void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
221 void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
225 void hpfs_lock_creation(struct super_block *);
226 void hpfs_unlock_creation(struct super_block *);
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 *);
236 void hpfs_set_dentry_operations(struct dentry *);
240 struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *);
241 extern const struct file_operations hpfs_dir_ops;
245 void hpfs_add_pos(struct inode *, loff_t *);
246 void hpfs_del_pos(struct inode *, loff_t *);
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,
250 struct hpfs_dirent *, int);
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 *);
255 struct hpfs_dirent *map_dirent(struct inode *, dnode_secno,
256 const unsigned char *, unsigned, dnode_secno *,
257 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 *, const char *,
271 int hpfs_file_fsync(struct file *, int);
272 extern const struct file_operations hpfs_file_ops;
273 extern const struct inode_operations hpfs_file_iops;
274 extern const struct address_space_operations hpfs_aops;
278 void hpfs_init_inode(struct inode *);
279 void hpfs_read_inode(struct inode *);
280 void hpfs_write_inode(struct inode *);
281 void hpfs_write_inode_nolock(struct inode *);
282 int hpfs_setattr(struct dentry *, struct iattr *);
283 void hpfs_write_if_changed(struct inode *);
284 void hpfs_evict_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 unsigned 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(const unsigned char *, unsigned *);
301 unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
302 int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
303 const unsigned char *, unsigned, int);
304 int hpfs_is_name_long(const unsigned char *, unsigned);
305 void hpfs_adjust_length(const unsigned char *, unsigned *);
306 void hpfs_decide_conv(struct inode *, const unsigned char *, unsigned);
310 extern const struct inode_operations hpfs_dir_iops;
311 extern const struct address_space_operations hpfs_symlink_aops;
313 static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
315 return list_entry(inode, struct hpfs_inode_info, vfs_inode);
318 static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
320 return sb->s_fs_info;
325 void hpfs_error(struct super_block *, const char *, ...)
326 __attribute__((format (printf, 2, 3)));
327 int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
328 unsigned hpfs_count_one_bitmap(struct super_block *, secno);
331 * local time (HPFS) to GMT (Unix)
334 static inline time_t local_to_gmt(struct super_block *s, time32_t t)
336 extern struct timezone sys_tz;
337 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
340 static inline time32_t gmt_to_local(struct super_block *s, time_t t)
342 extern struct timezone sys_tz;
343 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;