1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * linux/fs/hpfs/hpfs_fn.h
4 *
5 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
6 *
7 * function headers
8 */
9
10 //#define DBG
11 //#define DEBUG_LOCKS
12 #ifdef pr_fmt
13 #undef pr_fmt
14 #endif
15
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18 #include <linux/mutex.h>
19 #include <linux/pagemap.h>
20 #include <linux/buffer_head.h>
21 #include <linux/slab.h>
22 #include <linux/sched/signal.h>
23 #include <linux/blkdev.h>
24 #include <asm/unaligned.h>
25
26 #include "hpfs.h"
27
28 #define EIOERROR EIO
29 #define EFSERROR EUCLEAN
30
31 #define ANODE_ALLOC_FWD 512
32 #define FNODE_ALLOC_FWD 0
33 #define ALLOC_FWD_MIN 16
34 #define ALLOC_FWD_MAX 128
35 #define ALLOC_M 1
36 #define FNODE_RD_AHEAD 16
37 #define ANODE_RD_AHEAD 0
38 #define DNODE_RD_AHEAD 72
39 #define COUNT_RD_AHEAD 62
40
41 #define FREE_DNODES_ADD 58
42 #define FREE_DNODES_DEL 29
43
44 #define CHKCOND(x,y) if (!(x)) printk y
45
46 struct hpfs_inode_info {
47 loff_t mmu_private;
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_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 */
59 unsigned i_dirty : 1;
60 loff_t **i_rddir_off;
61 struct inode vfs_inode;
62 };
63
64 struct hpfs_sb_info {
65 struct mutex hpfs_mutex; /* global hpfs lock */
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 kuid_t sb_uid; /* uid from mount options */
75 kgid_t sb_gid; /* gid from mount options */
76 umode_t sb_mode; /* mode from mount options */
77 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
78 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
79 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
80 unsigned sb_lowercase : 1; /* downcase filenames hackery */
81 unsigned sb_was_error : 1; /* there was an error, set dirty flag */
82 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
83 unsigned char *sb_cp_table; /* code page tables: */
84 /* 128 bytes uppercasing table & */
85 /* 128 bytes lowercasing table */
86 __le32 *sb_bmp_dir; /* main bitmap directory */
87 unsigned sb_c_bitmap; /* current bitmap */
88 unsigned sb_max_fwd_alloc; /* max forwad allocation */
89 int sb_timeshift;
90 struct rcu_head rcu;
91
92 unsigned n_hotfixes;
93 secno hotfix_from[256];
94 secno hotfix_to[256];
95 };
96
97 /* Four 512-byte buffers and the 2k block obtained by concatenating them */
98
99 struct quad_buffer_head {
100 struct buffer_head *bh[4];
101 void *data;
102 };
103
104 /* The b-tree down pointer from a dir entry */
105
106 static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
107 {
108 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
109 return le32_to_cpu(*(__le32 *) ((void *) de + le16_to_cpu(de->length) - 4));
110 }
111
112 /* The first dir entry in a dnode */
113
114 static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
115 {
116 return (void *) dnode->dirent;
117 }
118
119 /* The end+1 of the dir entries */
120
121 static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
122 {
123 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)));
124 return (void *) dnode + le32_to_cpu(dnode->first_free);
125 }
126
127 /* The dir entry after dir entry de */
128
129 static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
130 {
131 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)));
132 return (void *) de + le16_to_cpu(de->length);
133 }
134
135 static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
136 {
137 return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s));
138 }
139
140 static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
141 {
142 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));
143 }
144
145 static unsigned ea_valuelen(struct extended_attribute *ea)
146 {
147 return ea->valuelen_lo + 256 * ea->valuelen_hi;
148 }
149
150 static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
151 {
152 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea));
153 }
154
155 static inline secno ea_sec(struct extended_attribute *ea)
156 {
157 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 9 + ea->namelen)));
158 }
159
160 static inline secno ea_len(struct extended_attribute *ea)
161 {
162 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 5 + ea->namelen)));
163 }
164
165 static inline char *ea_data(struct extended_attribute *ea)
166 {
167 return (char *)((char *)ea + 5 + ea->namelen);
168 }
169
170 static inline unsigned de_size(int namelen, secno down_ptr)
171 {
172 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
173 }
174
175 static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
176 {
177 int a;
178 int n;
179 if (!dst || !src) return;
180 a = dst->down;
181 n = dst->not_8x3;
182 memcpy((char *)dst + 2, (char *)src + 2, 28);
183 dst->down = a;
184 dst->not_8x3 = n;
185 }
186
187 static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n)
188 {
189 int i;
190 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
191 if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1;
192 for (i = 1; i < n; i++)
193 if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1))
194 return i + 1;
195 return 0;
196 }
197
198 /* alloc.c */
199
200 int hpfs_chk_sectors(struct super_block *, secno, int, char *);
201 secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int);
202 int hpfs_alloc_if_possible(struct super_block *, secno);
203 void hpfs_free_sectors(struct super_block *, secno, unsigned);
204 int hpfs_check_free_dnodes(struct super_block *, int);
205 void hpfs_free_dnode(struct super_block *, secno);
206 struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *);
207 struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
208 struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
209 int hpfs_trim_fs(struct super_block *, u64, u64, u64, unsigned *);
210
211 /* anode.c */
212
213 secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
214 secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
215 void hpfs_remove_btree(struct super_block *, struct bplus_header *);
216 int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
217 int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *);
218 void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
219 void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
220 void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
221
222 /* buffer.c */
223
224 secno hpfs_search_hotfix_map(struct super_block *s, secno sec);
225 unsigned hpfs_search_hotfix_map_for_range(struct super_block *s, secno sec, unsigned n);
226 void hpfs_prefetch_sectors(struct super_block *, unsigned, int);
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 *);
233
234 /* dentry.c */
235
236 extern const struct dentry_operations hpfs_dentry_operations;
237
238 /* dir.c */
239
240 struct dentry *hpfs_lookup(struct inode *, struct dentry *, unsigned int);
241 extern const struct file_operations hpfs_dir_ops;
242
243 /* dnode.c */
244
245 int 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 *);
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 *);
260
261 /* ea.c */
262
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 *,
267 const char *, int);
268
269 /* file.c */
270
271 int hpfs_file_fsync(struct file *, loff_t, loff_t, int);
272 void hpfs_truncate(struct inode *);
273 extern const struct file_operations hpfs_file_ops;
274 extern const struct inode_operations hpfs_file_iops;
275 extern const struct address_space_operations hpfs_aops;
276
277 /* inode.c */
278
279 void hpfs_init_inode(struct inode *);
280 void hpfs_read_inode(struct inode *);
281 void hpfs_write_inode(struct inode *);
282 void hpfs_write_inode_nolock(struct inode *);
283 int hpfs_setattr(struct mnt_idmap *, struct dentry *, struct iattr *);
284 void hpfs_write_if_changed(struct inode *);
285 void hpfs_evict_inode(struct inode *);
286
287 /* map.c */
288
289 __le32 *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
290 __le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
291 void hpfs_prefetch_bitmap(struct super_block *, unsigned);
292 unsigned char *hpfs_load_code_page(struct super_block *, secno);
293 __le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
294 void hpfs_load_hotfix_map(struct super_block *s, struct hpfs_spare_block *spareblock);
295 struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
296 struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
297 struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
298 dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
299
300 /* name.c */
301
302 unsigned char hpfs_upcase(unsigned char *, unsigned char);
303 int hpfs_chk_name(const unsigned char *, unsigned *);
304 unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
305 int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
306 const unsigned char *, unsigned, int);
307 int hpfs_is_name_long(const unsigned char *, unsigned);
308 void hpfs_adjust_length(const unsigned char *, unsigned *);
309
310 /* namei.c */
311
312 extern const struct inode_operations hpfs_dir_iops;
313 extern const struct address_space_operations hpfs_symlink_aops;
314
315 static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
316 {
317 return container_of(inode, struct hpfs_inode_info, vfs_inode);
318 }
319
320 static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
321 {
322 return sb->s_fs_info;
323 }
324
325 /* super.c */
326
327 __printf(2, 3)
328 void hpfs_error(struct super_block *, const char *, ...);
329 int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
330 unsigned hpfs_get_free_dnodes(struct super_block *);
331 long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg);
332
333 /*
334 * local time (HPFS) to GMT (Unix)
335 */
336
337 static inline time64_t local_to_gmt(struct super_block *s, time64_t t)
338 {
339 extern struct timezone sys_tz;
340 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
341 }
342
343 static inline time32_t gmt_to_local(struct super_block *s, time64_t t)
344 {
345 extern struct timezone sys_tz;
346 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
347 }
348
349 static inline time32_t local_get_seconds(struct super_block *s)
350 {
351 return gmt_to_local(s, ktime_get_real_seconds());
352 }
353
354 /*
355 * Locking:
356 *
357 * hpfs_lock() locks the whole filesystem. It must be taken
358 * on any method called by the VFS.
359 *
360 * We don't do any per-file locking anymore, it is hard to
361 * review and HPFS is not performance-sensitive anyway.
362 */
363 static inline void hpfs_lock(struct super_block *s)
364 {
365 struct hpfs_sb_info *sbi = hpfs_sb(s);
366 mutex_lock(&sbi->hpfs_mutex);
367 }
368
369 static inline void hpfs_unlock(struct super_block *s)
370 {
371 struct hpfs_sb_info *sbi = hpfs_sb(s);
372 mutex_unlock(&sbi->hpfs_mutex);
373 }
374
375 static inline void hpfs_lock_assert(struct super_block *s)
376 {
377 struct hpfs_sb_info *sbi = hpfs_sb(s);
378 WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex));
379 }
380
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