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