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 */
90 /* Four 512-byte buffers and the 2k block obtained by concatenating them */
92 struct quad_buffer_head {
93 struct buffer_head *bh[4];
97 /* The b-tree down pointer from a dir entry */
99 static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
101 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
102 return le32_to_cpu(*(dnode_secno *) ((void *) de + le16_to_cpu(de->length) - 4));
105 /* The first dir entry in a dnode */
107 static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
109 return (void *) dnode->dirent;
112 /* The end+1 of the dir entries */
114 static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
116 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)));
117 return (void *) dnode + le32_to_cpu(dnode->first_free);
120 /* The dir entry after dir entry de */
122 static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
124 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)));
125 return (void *) de + le16_to_cpu(de->length);
128 static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
130 return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s));
133 static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
135 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));
138 static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
140 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + le16_to_cpu(ea->valuelen));
143 static inline secno ea_sec(struct extended_attribute *ea)
145 return le32_to_cpu(*((secno *)((char *)ea + 9 + ea->namelen)));
148 static inline secno ea_len(struct extended_attribute *ea)
150 return le32_to_cpu(*((secno *)((char *)ea + 5 + ea->namelen)));
153 static inline char *ea_data(struct extended_attribute *ea)
155 return (char *)((char *)ea + 5 + ea->namelen);
158 static inline unsigned de_size(int namelen, secno down_ptr)
160 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
163 static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
167 if (!dst || !src) return;
170 memcpy((char *)dst + 2, (char *)src + 2, 28);
175 static inline unsigned tstbits(u32 *bmp, unsigned b, unsigned n)
178 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
179 if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1;
180 for (i = 1; i < n; i++)
181 if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1))
188 int hpfs_chk_sectors(struct super_block *, secno, int, char *);
189 secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int);
190 int hpfs_alloc_if_possible(struct super_block *, secno);
191 void hpfs_free_sectors(struct super_block *, secno, unsigned);
192 int hpfs_check_free_dnodes(struct super_block *, int);
193 void hpfs_free_dnode(struct super_block *, secno);
194 struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *);
195 struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
196 struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
200 secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
201 secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
202 void hpfs_remove_btree(struct super_block *, struct bplus_header *);
203 int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
204 int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *);
205 void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
206 void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
207 void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
211 void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
212 void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
213 void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
214 void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
215 void hpfs_brelse4(struct quad_buffer_head *);
216 void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
220 extern const struct dentry_operations hpfs_dentry_operations;
224 struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *);
225 extern const struct file_operations hpfs_dir_ops;
229 void hpfs_add_pos(struct inode *, loff_t *);
230 void hpfs_del_pos(struct inode *, loff_t *);
231 struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *,
232 const unsigned char *, unsigned, secno);
233 int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned,
234 struct hpfs_dirent *);
235 int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
236 void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
237 dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
238 struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
239 struct hpfs_dirent *map_dirent(struct inode *, dnode_secno,
240 const unsigned char *, unsigned, dnode_secno *,
241 struct quad_buffer_head *);
242 void hpfs_remove_dtree(struct super_block *, dnode_secno);
243 struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
247 void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
248 int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
249 char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
250 void hpfs_set_ea(struct inode *, struct fnode *, const char *,
255 int hpfs_file_fsync(struct file *, int);
256 extern const struct file_operations hpfs_file_ops;
257 extern const struct inode_operations hpfs_file_iops;
258 extern const struct address_space_operations hpfs_aops;
262 void hpfs_init_inode(struct inode *);
263 void hpfs_read_inode(struct inode *);
264 void hpfs_write_inode(struct inode *);
265 void hpfs_write_inode_nolock(struct inode *);
266 int hpfs_setattr(struct dentry *, struct iattr *);
267 void hpfs_write_if_changed(struct inode *);
268 void hpfs_evict_inode(struct inode *);
272 unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
273 unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
274 unsigned char *hpfs_load_code_page(struct super_block *, secno);
275 secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
276 struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
277 struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
278 struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
279 dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
283 unsigned char hpfs_upcase(unsigned char *, unsigned char);
284 int hpfs_chk_name(const unsigned char *, unsigned *);
285 unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
286 int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
287 const unsigned char *, unsigned, int);
288 int hpfs_is_name_long(const unsigned char *, unsigned);
289 void hpfs_adjust_length(const unsigned char *, unsigned *);
293 extern const struct inode_operations hpfs_dir_iops;
294 extern const struct address_space_operations hpfs_symlink_aops;
296 static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
298 return list_entry(inode, struct hpfs_inode_info, vfs_inode);
301 static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
303 return sb->s_fs_info;
308 void hpfs_error(struct super_block *, const char *, ...)
309 __attribute__((format (printf, 2, 3)));
310 int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
311 unsigned hpfs_count_one_bitmap(struct super_block *, secno);
314 * local time (HPFS) to GMT (Unix)
317 static inline time_t local_to_gmt(struct super_block *s, time32_t t)
319 extern struct timezone sys_tz;
320 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
323 static inline time32_t gmt_to_local(struct super_block *s, time_t t)
325 extern struct timezone sys_tz;
326 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
332 * hpfs_lock() locks the whole filesystem. It must be taken
333 * on any method called by the VFS.
335 * We don't do any per-file locking anymore, it is hard to
336 * review and HPFS is not performance-sensitive anyway.
338 static inline void hpfs_lock(struct super_block *s)
340 struct hpfs_sb_info *sbi = hpfs_sb(s);
341 mutex_lock(&sbi->hpfs_mutex);
344 static inline void hpfs_unlock(struct super_block *s)
346 struct hpfs_sb_info *sbi = hpfs_sb(s);
347 mutex_unlock(&sbi->hpfs_mutex);
350 static inline void hpfs_lock_assert(struct super_block *s)
352 struct hpfs_sb_info *sbi = hpfs_sb(s);
353 WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex));