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/hpfs_fs.h>
16 #include <linux/slab.h>
17 #include <linux/smp_lock.h>
22 #define EFSERROR EPERM
23 #define EMEMERROR ENOMEM
25 #define ANODE_ALLOC_FWD 512
26 #define FNODE_ALLOC_FWD 0
27 #define ALLOC_FWD_MIN 16
28 #define ALLOC_FWD_MAX 128
30 #define FNODE_RD_AHEAD 16
31 #define ANODE_RD_AHEAD 16
32 #define DNODE_RD_AHEAD 4
34 #define FREE_DNODES_ADD 58
35 #define FREE_DNODES_DEL 29
37 #define CHKCOND(x,y) if (!(x)) printk y
40 #define PRINTK(x) printk x
46 struct hpfs_inode_info {
48 ino_t i_parent_dir; /* (directories) gives fnode of parent dir */
49 unsigned i_dno; /* (directories) root dnode */
50 unsigned i_dpos; /* (directories) temp for readdir */
51 unsigned i_dsubdno; /* (directories) temp for readdir */
52 unsigned i_file_sec; /* (files) minimalist cache of alloc info */
53 unsigned i_disk_sec; /* (files) minimalist cache of alloc info */
54 unsigned i_n_secs; /* (files) minimalist cache of alloc info */
55 unsigned i_ea_size; /* size of extended attributes */
56 unsigned i_conv : 2; /* (files) crlf->newline hackery */
57 unsigned i_ea_mode : 1; /* file's permission is stored in ea */
58 unsigned i_ea_uid : 1; /* file's uid is stored in ea */
59 unsigned i_ea_gid : 1; /* file's gid is stored in ea */
62 struct mutex i_parent_mutex;
64 struct inode vfs_inode;
68 ino_t sb_root; /* inode number of root dir */
69 unsigned sb_fs_size; /* file system size, sectors */
70 unsigned sb_bitmaps; /* sector number of bitmap list */
71 unsigned sb_dirband_start; /* directory band start sector */
72 unsigned sb_dirband_size; /* directory band size, dnodes */
73 unsigned sb_dmap; /* sector number of dnode bit map */
74 unsigned sb_n_free; /* free blocks for statfs, or -1 */
75 unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */
76 uid_t sb_uid; /* uid from mount options */
77 gid_t sb_gid; /* gid from mount options */
78 umode_t sb_mode; /* mode from mount options */
79 unsigned sb_conv : 2; /* crlf->newline hackery */
80 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
81 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
82 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
83 unsigned sb_lowercase : 1; /* downcase filenames hackery */
84 unsigned sb_was_error : 1; /* there was an error, set dirty flag */
85 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
86 unsigned char *sb_cp_table; /* code page tables: */
87 /* 128 bytes uppercasing table & */
88 /* 128 bytes lowercasing table */
89 unsigned *sb_bmp_dir; /* main bitmap directory */
90 unsigned sb_c_bitmap; /* current bitmap */
91 unsigned sb_max_fwd_alloc; /* max forwad allocation */
92 struct semaphore hpfs_creation_de; /* when creating dirents, nobody else
94 /*unsigned sb_mounting : 1;*/
102 #define CONV_BINARY 0 /* no conversion */
103 #define CONV_TEXT 1 /* crlf->newline */
104 #define CONV_AUTO 2 /* decide based on file contents */
106 /* Four 512-byte buffers and the 2k block obtained by concatenating them */
108 struct quad_buffer_head {
109 struct buffer_head *bh[4];
113 /* The b-tree down pointer from a dir entry */
115 static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
117 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
118 return *(dnode_secno *) ((void *) de + de->length - 4);
121 /* The first dir entry in a dnode */
123 static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
125 return (void *) dnode->dirent;
128 /* The end+1 of the dir entries */
130 static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
132 CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free));
133 return (void *) dnode + dnode->first_free;
136 /* The dir entry after dir entry de */
138 static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
140 CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length));
141 return (void *) de + de->length;
144 static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
146 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s);
149 static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
151 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s);
154 static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
156 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen);
159 static inline secno ea_sec(struct extended_attribute *ea)
161 return *(secno *)((char *)ea + 9 + ea->namelen);
164 static inline secno ea_len(struct extended_attribute *ea)
166 return *(secno *)((char *)ea + 5 + ea->namelen);
169 static inline char *ea_data(struct extended_attribute *ea)
171 return (char *)((char *)ea + 5 + ea->namelen);
174 static inline unsigned de_size(int namelen, secno down_ptr)
176 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
179 static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
183 if (!dst || !src) return;
186 memcpy((char *)dst + 2, (char *)src + 2, 28);
191 static inline unsigned tstbits(unsigned *bmp, unsigned b, unsigned n)
194 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
195 if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1;
196 for (i = 1; i < n; i++)
197 if (/*b+i < 0x4000 &&*/ !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1))
204 int hpfs_chk_sectors(struct super_block *, secno, int, char *);
205 secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int);
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 const 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 int hpfs_add_dirent(struct inode *, unsigned char *, unsigned, 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, char *, unsigned, dnode_secno *, struct quad_buffer_head *);
256 void hpfs_remove_dtree(struct super_block *, dnode_secno);
257 struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
261 void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
262 int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
263 char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
264 void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int);
268 int hpfs_file_fsync(struct file *, struct dentry *, int);
269 extern const struct file_operations hpfs_file_ops;
270 extern struct inode_operations hpfs_file_iops;
271 extern struct address_space_operations hpfs_aops;
275 void hpfs_init_inode(struct inode *);
276 void hpfs_read_inode(struct inode *);
277 void hpfs_write_inode(struct inode *);
278 void hpfs_write_inode_nolock(struct inode *);
279 int hpfs_notify_change(struct dentry *, struct iattr *);
280 void hpfs_write_if_changed(struct inode *);
281 void hpfs_delete_inode(struct inode *);
285 unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
286 unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
287 char *hpfs_load_code_page(struct super_block *, secno);
288 secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
289 struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
290 struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
291 struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
292 dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
296 unsigned char hpfs_upcase(unsigned char *, unsigned char);
297 int hpfs_chk_name(unsigned char *, unsigned *);
298 char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
299 int hpfs_compare_names(struct super_block *, unsigned char *, unsigned, unsigned char *, unsigned, int);
300 int hpfs_is_name_long(unsigned char *, unsigned);
301 void hpfs_adjust_length(unsigned char *, unsigned *);
302 void hpfs_decide_conv(struct inode *, unsigned char *, unsigned);
306 extern struct inode_operations hpfs_dir_iops;
307 extern struct address_space_operations hpfs_symlink_aops;
309 static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
311 return list_entry(inode, struct hpfs_inode_info, vfs_inode);
314 static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
316 return sb->s_fs_info;
321 void hpfs_error(struct super_block *, char *, ...);
322 int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
323 unsigned hpfs_count_one_bitmap(struct super_block *, secno);
326 * local time (HPFS) to GMT (Unix)
329 static inline time_t local_to_gmt(struct super_block *s, time32_t t)
331 extern struct timezone sys_tz;
332 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
335 static inline time32_t gmt_to_local(struct super_block *s, time_t t)
337 extern struct timezone sys_tz;
338 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;