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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 EPERM
30#define EMEMERROR ENOMEM
31
32#define ANODE_ALLOC_FWD 512
33#define FNODE_ALLOC_FWD 0
34#define ALLOC_FWD_MIN 16
35#define ALLOC_FWD_MAX 128
36#define ALLOC_M 1
37#define FNODE_RD_AHEAD 16
38#define ANODE_RD_AHEAD 0
39#define DNODE_RD_AHEAD 72
40#define COUNT_RD_AHEAD 62
41
42#define FREE_DNODES_ADD 58
43#define FREE_DNODES_DEL 29
44
45#define CHKCOND(x,y) if (!(x)) printk y
46
47struct hpfs_inode_info {
48 loff_t mmu_private;
49 ino_t i_parent_dir; /* (directories) gives fnode of parent dir */
50 unsigned i_dno; /* (directories) root dnode */
51 unsigned i_dpos; /* (directories) temp for readdir */
52 unsigned i_dsubdno; /* (directories) temp for readdir */
53 unsigned i_file_sec; /* (files) minimalist cache of alloc info */
54 unsigned i_disk_sec; /* (files) minimalist cache of alloc info */
55 unsigned i_n_secs; /* (files) minimalist cache of alloc info */
56 unsigned i_ea_size; /* size of extended attributes */
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 */
60 unsigned i_dirty : 1;
61 loff_t **i_rddir_off;
62 struct inode vfs_inode;
63};
64
65struct hpfs_sb_info {
66 struct mutex hpfs_mutex; /* global hpfs lock */
67 ino_t sb_root; /* inode number of root dir */
68 unsigned sb_fs_size; /* file system size, sectors */
69 unsigned sb_bitmaps; /* sector number of bitmap list */
70 unsigned sb_dirband_start; /* directory band start sector */
71 unsigned sb_dirband_size; /* directory band size, dnodes */
72 unsigned sb_dmap; /* sector number of dnode bit map */
73 unsigned sb_n_free; /* free blocks for statfs, or -1 */
74 unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */
75 kuid_t sb_uid; /* uid from mount options */
76 kgid_t sb_gid; /* gid from mount options */
77 umode_t sb_mode; /* mode from mount options */
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 __le32 *sb_bmp_dir; /* main bitmap directory */
88 unsigned sb_c_bitmap; /* current bitmap */
89 unsigned sb_max_fwd_alloc; /* max forwad allocation */
90 int sb_timeshift;
91 struct rcu_head rcu;
92
93 unsigned n_hotfixes;
94 secno hotfix_from[256];
95 secno hotfix_to[256];
96};
97
98/* Four 512-byte buffers and the 2k block obtained by concatenating them */
99
100struct quad_buffer_head {
101 struct buffer_head *bh[4];
102 void *data;
103};
104
105/* The b-tree down pointer from a dir entry */
106
107static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
108{
109 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
110 return le32_to_cpu(*(__le32 *) ((void *) de + le16_to_cpu(de->length) - 4));
111}
112
113/* The first dir entry in a dnode */
114
115static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
116{
117 return (void *) dnode->dirent;
118}
119
120/* The end+1 of the dir entries */
121
122static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
123{
124 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)));
125 return (void *) dnode + le32_to_cpu(dnode->first_free);
126}
127
128/* The dir entry after dir entry de */
129
130static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
131{
132 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)));
133 return (void *) de + le16_to_cpu(de->length);
134}
135
136static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
137{
138 return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s));
139}
140
141static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
142{
143 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));
144}
145
146static unsigned ea_valuelen(struct extended_attribute *ea)
147{
148 return ea->valuelen_lo + 256 * ea->valuelen_hi;
149}
150
151static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
152{
153 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea));
154}
155
156static inline secno ea_sec(struct extended_attribute *ea)
157{
158 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 9 + ea->namelen)));
159}
160
161static inline secno ea_len(struct extended_attribute *ea)
162{
163 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 5 + ea->namelen)));
164}
165
166static inline char *ea_data(struct extended_attribute *ea)
167{
168 return (char *)((char *)ea + 5 + ea->namelen);
169}
170
171static inline unsigned de_size(int namelen, secno down_ptr)
172{
173 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
174}
175
176static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
177{
178 int a;
179 int n;
180 if (!dst || !src) return;
181 a = dst->down;
182 n = dst->not_8x3;
183 memcpy((char *)dst + 2, (char *)src + 2, 28);
184 dst->down = a;
185 dst->not_8x3 = n;
186}
187
188static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n)
189{
190 int i;
191 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
192 if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1;
193 for (i = 1; i < n; i++)
194 if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1))
195 return i + 1;
196 return 0;
197}
198
199/* alloc.c */
200
201int hpfs_chk_sectors(struct super_block *, secno, int, char *);
202secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int);
203int hpfs_alloc_if_possible(struct super_block *, secno);
204void hpfs_free_sectors(struct super_block *, secno, unsigned);
205int hpfs_check_free_dnodes(struct super_block *, int);
206void hpfs_free_dnode(struct super_block *, secno);
207struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *);
208struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
209struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
210int hpfs_trim_fs(struct super_block *, u64, u64, u64, unsigned *);
211
212/* anode.c */
213
214secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
215secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
216void hpfs_remove_btree(struct super_block *, struct bplus_header *);
217int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
218int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *);
219void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
220void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
221void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
222
223/* buffer.c */
224
225secno hpfs_search_hotfix_map(struct super_block *s, secno sec);
226unsigned hpfs_search_hotfix_map_for_range(struct super_block *s, secno sec, unsigned n);
227void hpfs_prefetch_sectors(struct super_block *, unsigned, int);
228void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
229void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
230void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
231void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
232void hpfs_brelse4(struct quad_buffer_head *);
233void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
234
235/* dentry.c */
236
237extern const struct dentry_operations hpfs_dentry_operations;
238
239/* dir.c */
240
241struct dentry *hpfs_lookup(struct inode *, struct dentry *, unsigned int);
242extern const struct file_operations hpfs_dir_ops;
243
244/* dnode.c */
245
246int hpfs_add_pos(struct inode *, loff_t *);
247void hpfs_del_pos(struct inode *, loff_t *);
248struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *,
249 const unsigned char *, unsigned, secno);
250int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned,
251 struct hpfs_dirent *);
252int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
253void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
254dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
255struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
256struct hpfs_dirent *map_dirent(struct inode *, dnode_secno,
257 const unsigned char *, unsigned, dnode_secno *,
258 struct quad_buffer_head *);
259void hpfs_remove_dtree(struct super_block *, dnode_secno);
260struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
261
262/* ea.c */
263
264void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
265int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
266char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
267void hpfs_set_ea(struct inode *, struct fnode *, const char *,
268 const char *, int);
269
270/* file.c */
271
272int hpfs_file_fsync(struct file *, loff_t, loff_t, int);
273void hpfs_truncate(struct inode *);
274extern const struct file_operations hpfs_file_ops;
275extern const struct inode_operations hpfs_file_iops;
276extern const struct address_space_operations hpfs_aops;
277
278/* inode.c */
279
280void hpfs_init_inode(struct inode *);
281void hpfs_read_inode(struct inode *);
282void hpfs_write_inode(struct inode *);
283void hpfs_write_inode_nolock(struct inode *);
284int hpfs_setattr(struct dentry *, struct iattr *);
285void hpfs_write_if_changed(struct inode *);
286void hpfs_evict_inode(struct inode *);
287
288/* map.c */
289
290__le32 *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
291__le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
292void hpfs_prefetch_bitmap(struct super_block *, unsigned);
293unsigned char *hpfs_load_code_page(struct super_block *, secno);
294__le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
295void hpfs_load_hotfix_map(struct super_block *s, struct hpfs_spare_block *spareblock);
296struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
297struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
298struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
299dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
300
301/* name.c */
302
303unsigned char hpfs_upcase(unsigned char *, unsigned char);
304int hpfs_chk_name(const unsigned char *, unsigned *);
305unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
306int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
307 const unsigned char *, unsigned, int);
308int hpfs_is_name_long(const unsigned char *, unsigned);
309void hpfs_adjust_length(const unsigned char *, unsigned *);
310
311/* namei.c */
312
313extern const struct inode_operations hpfs_dir_iops;
314extern const struct address_space_operations hpfs_symlink_aops;
315
316static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
317{
318 return container_of(inode, struct hpfs_inode_info, vfs_inode);
319}
320
321static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
322{
323 return sb->s_fs_info;
324}
325
326/* super.c */
327
328__printf(2, 3)
329void hpfs_error(struct super_block *, const char *, ...);
330int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
331unsigned hpfs_get_free_dnodes(struct super_block *);
332long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg);
333
334/*
335 * local time (HPFS) to GMT (Unix)
336 */
337
338static inline time_t local_to_gmt(struct super_block *s, time32_t t)
339{
340 extern struct timezone sys_tz;
341 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
342}
343
344static inline time32_t gmt_to_local(struct super_block *s, time_t t)
345{
346 extern struct timezone sys_tz;
347 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
348}
349
350/*
351 * Locking:
352 *
353 * hpfs_lock() locks the whole filesystem. It must be taken
354 * on any method called by the VFS.
355 *
356 * We don't do any per-file locking anymore, it is hard to
357 * review and HPFS is not performance-sensitive anyway.
358 */
359static inline void hpfs_lock(struct super_block *s)
360{
361 struct hpfs_sb_info *sbi = hpfs_sb(s);
362 mutex_lock(&sbi->hpfs_mutex);
363}
364
365static inline void hpfs_unlock(struct super_block *s)
366{
367 struct hpfs_sb_info *sbi = hpfs_sb(s);
368 mutex_unlock(&sbi->hpfs_mutex);
369}
370
371static inline void hpfs_lock_assert(struct super_block *s)
372{
373 struct hpfs_sb_info *sbi = hpfs_sb(s);
374 WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex));
375}
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
46struct 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
64struct 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
99struct 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
106static 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
114static 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
121static 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
129static 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
135static 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
140static 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
145static unsigned ea_valuelen(struct extended_attribute *ea)
146{
147 return ea->valuelen_lo + 256 * ea->valuelen_hi;
148}
149
150static 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
155static inline secno ea_sec(struct extended_attribute *ea)
156{
157 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 9 + ea->namelen)));
158}
159
160static inline secno ea_len(struct extended_attribute *ea)
161{
162 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 5 + ea->namelen)));
163}
164
165static inline char *ea_data(struct extended_attribute *ea)
166{
167 return (char *)((char *)ea + 5 + ea->namelen);
168}
169
170static inline unsigned de_size(int namelen, secno down_ptr)
171{
172 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
173}
174
175static 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
187static 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
200int hpfs_chk_sectors(struct super_block *, secno, int, char *);
201secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int);
202int hpfs_alloc_if_possible(struct super_block *, secno);
203void hpfs_free_sectors(struct super_block *, secno, unsigned);
204int hpfs_check_free_dnodes(struct super_block *, int);
205void hpfs_free_dnode(struct super_block *, secno);
206struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *);
207struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
208struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
209int hpfs_trim_fs(struct super_block *, u64, u64, u64, unsigned *);
210
211/* anode.c */
212
213secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
214secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
215void hpfs_remove_btree(struct super_block *, struct bplus_header *);
216int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
217int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *);
218void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
219void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
220void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
221
222/* buffer.c */
223
224secno hpfs_search_hotfix_map(struct super_block *s, secno sec);
225unsigned hpfs_search_hotfix_map_for_range(struct super_block *s, secno sec, unsigned n);
226void hpfs_prefetch_sectors(struct super_block *, unsigned, int);
227void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
228void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
229void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
230void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
231void hpfs_brelse4(struct quad_buffer_head *);
232void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
233
234/* dentry.c */
235
236extern const struct dentry_operations hpfs_dentry_operations;
237
238/* dir.c */
239
240struct dentry *hpfs_lookup(struct inode *, struct dentry *, unsigned int);
241extern const struct file_operations hpfs_dir_ops;
242
243/* dnode.c */
244
245int hpfs_add_pos(struct inode *, loff_t *);
246void hpfs_del_pos(struct inode *, loff_t *);
247struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *,
248 const unsigned char *, unsigned, secno);
249int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned,
250 struct hpfs_dirent *);
251int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
252void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
253dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
254struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
255struct hpfs_dirent *map_dirent(struct inode *, dnode_secno,
256 const unsigned char *, unsigned, dnode_secno *,
257 struct quad_buffer_head *);
258void hpfs_remove_dtree(struct super_block *, dnode_secno);
259struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
260
261/* ea.c */
262
263void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
264int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
265char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
266void hpfs_set_ea(struct inode *, struct fnode *, const char *,
267 const char *, int);
268
269/* file.c */
270
271int hpfs_file_fsync(struct file *, loff_t, loff_t, int);
272void hpfs_truncate(struct inode *);
273extern const struct file_operations hpfs_file_ops;
274extern const struct inode_operations hpfs_file_iops;
275extern const struct address_space_operations hpfs_aops;
276
277/* inode.c */
278
279void hpfs_init_inode(struct inode *);
280void hpfs_read_inode(struct inode *);
281void hpfs_write_inode(struct inode *);
282void hpfs_write_inode_nolock(struct inode *);
283int hpfs_setattr(struct mnt_idmap *, struct dentry *, struct iattr *);
284void hpfs_write_if_changed(struct inode *);
285void 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 *);
291void hpfs_prefetch_bitmap(struct super_block *, unsigned);
292unsigned char *hpfs_load_code_page(struct super_block *, secno);
293__le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
294void hpfs_load_hotfix_map(struct super_block *s, struct hpfs_spare_block *spareblock);
295struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
296struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
297struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
298dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
299
300/* name.c */
301
302unsigned char hpfs_upcase(unsigned char *, unsigned char);
303int hpfs_chk_name(const unsigned char *, unsigned *);
304unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
305int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
306 const unsigned char *, unsigned, int);
307int hpfs_is_name_long(const unsigned char *, unsigned);
308void hpfs_adjust_length(const unsigned char *, unsigned *);
309
310/* namei.c */
311
312extern const struct inode_operations hpfs_dir_iops;
313extern const struct address_space_operations hpfs_symlink_aops;
314
315static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
316{
317 return container_of(inode, struct hpfs_inode_info, vfs_inode);
318}
319
320static 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)
328void hpfs_error(struct super_block *, const char *, ...);
329int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
330unsigned hpfs_get_free_dnodes(struct super_block *);
331long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg);
332
333/*
334 * local time (HPFS) to GMT (Unix)
335 */
336
337static 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
343static 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
349static 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 */
363static 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
369static 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
375static 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}