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_ea_mode : 1; /* file's permission is stored in ea */
55 unsigned i_ea_uid : 1; /* file's uid is stored in ea */
56 unsigned i_ea_gid : 1; /* file's gid is stored in ea */
59 struct inode vfs_inode;
63 struct mutex hpfs_mutex; /* global hpfs lock */
64 ino_t sb_root; /* inode number of root dir */
65 unsigned sb_fs_size; /* file system size, sectors */
66 unsigned sb_bitmaps; /* sector number of bitmap list */
67 unsigned sb_dirband_start; /* directory band start sector */
68 unsigned sb_dirband_size; /* directory band size, dnodes */
69 unsigned sb_dmap; /* sector number of dnode bit map */
70 unsigned sb_n_free; /* free blocks for statfs, or -1 */
71 unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */
72 uid_t sb_uid; /* uid from mount options */
73 gid_t sb_gid; /* gid from mount options */
74 umode_t sb_mode; /* mode from mount options */
75 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
76 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
77 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
78 unsigned sb_lowercase : 1; /* downcase filenames hackery */
79 unsigned sb_was_error : 1; /* there was an error, set dirty flag */
80 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
81 unsigned char *sb_cp_table; /* code page tables: */
82 /* 128 bytes uppercasing table & */
83 /* 128 bytes lowercasing table */
84 unsigned *sb_bmp_dir; /* main bitmap directory */
85 unsigned sb_c_bitmap; /* current bitmap */
86 unsigned sb_max_fwd_alloc; /* max forwad allocation */
87 /*unsigned sb_mounting : 1;*/
91 /* Four 512-byte buffers and the 2k block obtained by concatenating them */
93 struct quad_buffer_head {
94 struct buffer_head *bh[4];
98 /* The b-tree down pointer from a dir entry */
100 static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
102 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
103 return *(dnode_secno *) ((void *) de + de->length - 4);
106 /* The first dir entry in a dnode */
108 static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
110 return (void *) dnode->dirent;
113 /* The end+1 of the dir entries */
115 static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
117 CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free));
118 return (void *) dnode + dnode->first_free;
121 /* The dir entry after dir entry de */
123 static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
125 CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length));
126 return (void *) de + de->length;
129 static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
131 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s);
134 static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
136 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s);
139 static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
141 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen);
144 static inline secno ea_sec(struct extended_attribute *ea)
146 return *(secno *)((char *)ea + 9 + ea->namelen);
149 static inline secno ea_len(struct extended_attribute *ea)
151 return *(secno *)((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(unsigned *bmp, unsigned b, unsigned n)
179 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
180 if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1;
181 for (i = 1; i < n; i++)
182 if (/*b+i < 0x4000 &&*/ !((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_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
213 void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
214 void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
215 void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
216 void hpfs_brelse4(struct quad_buffer_head *);
217 void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
221 extern const struct dentry_operations hpfs_dentry_operations;
225 struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *);
226 extern const struct file_operations hpfs_dir_ops;
230 void hpfs_add_pos(struct inode *, loff_t *);
231 void hpfs_del_pos(struct inode *, loff_t *);
232 struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *,
233 const unsigned char *, unsigned, secno);
234 int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned,
235 struct hpfs_dirent *);
236 int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
237 void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
238 dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
239 struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
240 struct hpfs_dirent *map_dirent(struct inode *, dnode_secno,
241 const unsigned char *, unsigned, dnode_secno *,
242 struct quad_buffer_head *);
243 void hpfs_remove_dtree(struct super_block *, dnode_secno);
244 struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
248 void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
249 int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
250 char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
251 void hpfs_set_ea(struct inode *, struct fnode *, const char *,
256 int hpfs_file_fsync(struct file *, int);
257 extern const struct file_operations hpfs_file_ops;
258 extern const struct inode_operations hpfs_file_iops;
259 extern const struct address_space_operations hpfs_aops;
263 void hpfs_init_inode(struct inode *);
264 void hpfs_read_inode(struct inode *);
265 void hpfs_write_inode(struct inode *);
266 void hpfs_write_inode_nolock(struct inode *);
267 int hpfs_setattr(struct dentry *, struct iattr *);
268 void hpfs_write_if_changed(struct inode *);
269 void hpfs_evict_inode(struct inode *);
273 unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
274 unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
275 unsigned char *hpfs_load_code_page(struct super_block *, secno);
276 secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
277 struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
278 struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
279 struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
280 dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
284 unsigned char hpfs_upcase(unsigned char *, unsigned char);
285 int hpfs_chk_name(const unsigned char *, unsigned *);
286 unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
287 int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
288 const unsigned char *, unsigned, int);
289 int hpfs_is_name_long(const unsigned char *, unsigned);
290 void hpfs_adjust_length(const unsigned char *, unsigned *);
294 extern const struct inode_operations hpfs_dir_iops;
295 extern const struct address_space_operations hpfs_symlink_aops;
297 static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
299 return list_entry(inode, struct hpfs_inode_info, vfs_inode);
302 static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
304 return sb->s_fs_info;
309 void hpfs_error(struct super_block *, const char *, ...)
310 __attribute__((format (printf, 2, 3)));
311 int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
312 unsigned hpfs_count_one_bitmap(struct super_block *, secno);
315 * local time (HPFS) to GMT (Unix)
318 static inline time_t local_to_gmt(struct super_block *s, time32_t t)
320 extern struct timezone sys_tz;
321 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
324 static inline time32_t gmt_to_local(struct super_block *s, time_t t)
326 extern struct timezone sys_tz;
327 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
333 * hpfs_lock() locks the whole filesystem. It must be taken
334 * on any method called by the VFS.
336 * We don't do any per-file locking anymore, it is hard to
337 * review and HPFS is not performance-sensitive anyway.
339 static inline void hpfs_lock(struct super_block *s)
341 struct hpfs_sb_info *sbi = hpfs_sb(s);
342 mutex_lock(&sbi->hpfs_mutex);
345 static inline void hpfs_unlock(struct super_block *s)
347 struct hpfs_sb_info *sbi = hpfs_sb(s);
348 mutex_unlock(&sbi->hpfs_mutex);
351 static inline void hpfs_lock_assert(struct super_block *s)
353 struct hpfs_sb_info *sbi = hpfs_sb(s);
354 WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex));