1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifdef pr_fmt
#undef pr_fmt
#endif
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include "amigaffs.h"
#include <linux/mutex.h>
#include <linux/workqueue.h>
/* Ugly macros make the code more pretty. */
#define GET_END_PTR(st,p,sz) ((st *)((char *)(p)+((sz)-sizeof(st))))
#define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
#define AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
#define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data)
#define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
#define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data)
#define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
#define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data)
#define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data)
#define AFFS_CACHE_SIZE PAGE_SIZE
#define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2)
#define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
#define AFFS_AC_MASK (AFFS_AC_SIZE-1)
#define AFFSNAMEMAX 30U
struct affs_ext_key {
u32 ext; /* idx of the extended block */
u32 key; /* block number */
};
/*
* affs fs inode data in memory
*/
struct affs_inode_info {
atomic_t i_opencnt;
struct mutex i_link_lock; /* Protects internal inode access. */
struct mutex i_ext_lock; /* Protects internal inode access. */
#define i_hash_lock i_ext_lock
u32 i_blkcnt; /* block count */
u32 i_extcnt; /* extended block count */
u32 *i_lc; /* linear cache of extended blocks */
u32 i_lc_size;
u32 i_lc_shift;
u32 i_lc_mask;
struct affs_ext_key *i_ac; /* associative cache of extended blocks */
u32 i_ext_last; /* last accessed extended block */
struct buffer_head *i_ext_bh; /* bh of last extended block */
loff_t mmu_private;
u32 i_protect; /* unused attribute bits */
u32 i_lastalloc; /* last allocated block */
int i_pa_cnt; /* number of preallocated blocks */
struct inode vfs_inode;
};
/* short cut to get to the affs specific inode data */
static inline struct affs_inode_info *AFFS_I(struct inode *inode)
{
return container_of(inode, struct affs_inode_info, vfs_inode);
}
/*
* super-block data in memory
*
* Block numbers are adjusted for their actual size
*
*/
struct affs_bm_info {
u32 bm_key; /* Disk block number */
u32 bm_free; /* Free blocks in here */
};
struct affs_sb_info {
int s_partition_size; /* Partition size in blocks. */
int s_reserved; /* Number of reserved blocks. */
//u32 s_blksize; /* Initial device blksize */
u32 s_data_blksize; /* size of the data block w/o header */
u32 s_root_block; /* FFS root block number. */
int s_hashsize; /* Size of hash table. */
unsigned long s_flags; /* See below. */
kuid_t s_uid; /* uid to override */
kgid_t s_gid; /* gid to override */
umode_t s_mode; /* mode to override */
struct buffer_head *s_root_bh; /* Cached root block. */
struct mutex s_bmlock; /* Protects bitmap access. */
struct affs_bm_info *s_bitmap; /* Bitmap infos. */
u32 s_bmap_count; /* # of bitmap blocks. */
u32 s_bmap_bits; /* # of bits in one bitmap blocks */
u32 s_last_bmap;
struct buffer_head *s_bmap_bh;
char *s_prefix; /* Prefix for volumes and assigns. */
char s_volume[32]; /* Volume prefix for absolute symlinks. */
spinlock_t symlink_lock; /* protects the previous two */
struct super_block *sb; /* the VFS superblock object */
int work_queued; /* non-zero delayed work is queued */
struct delayed_work sb_work; /* superblock flush delayed work */
spinlock_t work_lock; /* protects sb_work and work_queued */
};
#define AFFS_MOUNT_SF_INTL 0x0001 /* International filesystem. */
#define AFFS_MOUNT_SF_BM_VALID 0x0002 /* Bitmap is valid. */
#define AFFS_MOUNT_SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */
#define AFFS_MOUNT_SF_QUIET 0x0008 /* chmod errors will be not reported */
#define AFFS_MOUNT_SF_SETUID 0x0010 /* Ignore Amiga uid */
#define AFFS_MOUNT_SF_SETGID 0x0020 /* Ignore Amiga gid */
#define AFFS_MOUNT_SF_SETMODE 0x0040 /* Ignore Amiga protection bits */
#define AFFS_MOUNT_SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */
#define AFFS_MOUNT_SF_OFS 0x0200 /* Old filesystem */
#define AFFS_MOUNT_SF_PREFIX 0x0400 /* Buffer for prefix is allocated */
#define AFFS_MOUNT_SF_VERBOSE 0x0800 /* Talk about fs when mounting */
#define AFFS_MOUNT_SF_NO_TRUNCATE 0x1000 /* Don't truncate filenames */
#define affs_clear_opt(o, opt) (o &= ~AFFS_MOUNT_##opt)
#define affs_set_opt(o, opt) (o |= AFFS_MOUNT_##opt)
#define affs_test_opt(o, opt) ((o) & AFFS_MOUNT_##opt)
/* short cut to get to the affs specific sb data */
static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
{
return sb->s_fs_info;
}
void affs_mark_sb_dirty(struct super_block *sb);
/* amigaffs.c */
extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh);
extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
extern int affs_remove_header(struct dentry *dentry);
extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
extern void affs_secs_to_datestamp(time64_t secs, struct affs_date *ds);
extern umode_t affs_prot_to_mode(u32 prot);
extern void affs_mode_to_prot(struct inode *inode);
__printf(3, 4)
extern void affs_error(struct super_block *sb, const char *function,
const char *fmt, ...);
__printf(3, 4)
extern void affs_warning(struct super_block *sb, const char *function,
const char *fmt, ...);
extern bool affs_nofilenametruncate(const struct dentry *dentry);
extern int affs_check_name(const unsigned char *name, int len,
bool notruncate);
extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry);
/* bitmap. c */
extern u32 affs_count_free_blocks(struct super_block *s);
extern void affs_free_block(struct super_block *sb, u32 block);
extern u32 affs_alloc_block(struct inode *inode, u32 goal);
extern int affs_init_bitmap(struct super_block *sb, int *flags);
extern void affs_free_bitmap(struct super_block *sb);
/* namei.c */
extern const struct export_operations affs_export_ops;
extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);
extern int affs_unlink(struct inode *dir, struct dentry *dentry);
extern int affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool);
extern int affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
extern int affs_rmdir(struct inode *dir, struct dentry *dentry);
extern int affs_link(struct dentry *olddentry, struct inode *dir,
struct dentry *dentry);
extern int affs_symlink(struct inode *dir, struct dentry *dentry,
const char *symname);
extern int affs_rename2(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags);
/* inode.c */
extern struct inode *affs_new_inode(struct inode *dir);
extern int affs_notify_change(struct dentry *dentry, struct iattr *attr);
extern void affs_evict_inode(struct inode *inode);
extern struct inode *affs_iget(struct super_block *sb,
unsigned long ino);
extern int affs_write_inode(struct inode *inode,
struct writeback_control *wbc);
extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
/* file.c */
void affs_free_prealloc(struct inode *inode);
extern void affs_truncate(struct inode *);
int affs_file_fsync(struct file *, loff_t, loff_t, int);
/* dir.c */
extern void affs_dir_truncate(struct inode *);
/* jump tables */
extern const struct inode_operations affs_file_inode_operations;
extern const struct inode_operations affs_dir_inode_operations;
extern const struct inode_operations affs_symlink_inode_operations;
extern const struct file_operations affs_file_operations;
extern const struct file_operations affs_file_operations_ofs;
extern const struct file_operations affs_dir_operations;
extern const struct address_space_operations affs_symlink_aops;
extern const struct address_space_operations affs_aops;
extern const struct address_space_operations affs_aops_ofs;
extern const struct dentry_operations affs_dentry_operations;
extern const struct dentry_operations affs_intl_dentry_operations;
static inline bool affs_validblock(struct super_block *sb, int block)
{
return(block >= AFFS_SB(sb)->s_reserved &&
block < AFFS_SB(sb)->s_partition_size);
}
static inline void
affs_set_blocksize(struct super_block *sb, int size)
{
sb_set_blocksize(sb, size);
}
static inline struct buffer_head *
affs_bread(struct super_block *sb, int block)
{
pr_debug("%s: %d\n", __func__, block);
if (affs_validblock(sb, block))
return sb_bread(sb, block);
return NULL;
}
static inline struct buffer_head *
affs_getblk(struct super_block *sb, int block)
{
pr_debug("%s: %d\n", __func__, block);
if (affs_validblock(sb, block))
return sb_getblk(sb, block);
return NULL;
}
static inline struct buffer_head *
affs_getzeroblk(struct super_block *sb, int block)
{
struct buffer_head *bh;
pr_debug("%s: %d\n", __func__, block);
if (affs_validblock(sb, block)) {
bh = sb_getblk(sb, block);
lock_buffer(bh);
memset(bh->b_data, 0 , sb->s_blocksize);
set_buffer_uptodate(bh);
unlock_buffer(bh);
return bh;
}
return NULL;
}
static inline struct buffer_head *
affs_getemptyblk(struct super_block *sb, int block)
{
struct buffer_head *bh;
pr_debug("%s: %d\n", __func__, block);
if (affs_validblock(sb, block)) {
bh = sb_getblk(sb, block);
wait_on_buffer(bh);
set_buffer_uptodate(bh);
return bh;
}
return NULL;
}
static inline void
affs_brelse(struct buffer_head *bh)
{
if (bh)
pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr);
brelse(bh);
}
static inline void
affs_adjust_checksum(struct buffer_head *bh, u32 val)
{
u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
}
static inline void
affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
{
u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
}
static inline void
affs_lock_link(struct inode *inode)
{
mutex_lock(&AFFS_I(inode)->i_link_lock);
}
static inline void
affs_unlock_link(struct inode *inode)
{
mutex_unlock(&AFFS_I(inode)->i_link_lock);
}
static inline void
affs_lock_dir(struct inode *inode)
{
mutex_lock_nested(&AFFS_I(inode)->i_hash_lock, SINGLE_DEPTH_NESTING);
}
static inline void
affs_unlock_dir(struct inode *inode)
{
mutex_unlock(&AFFS_I(inode)->i_hash_lock);
}
static inline void
affs_lock_ext(struct inode *inode)
{
mutex_lock(&AFFS_I(inode)->i_ext_lock);
}
static inline void
affs_unlock_ext(struct inode *inode)
{
mutex_unlock(&AFFS_I(inode)->i_ext_lock);
}
|
