1 #include <linux/types.h>
2 #include <linux/fs.h>
3 #include <linux/buffer_head.h>
4 #include <linux/amigaffs.h>
5 #include <linux/mutex.h>
6
7 /* AmigaOS allows file names with up to 30 characters length.
8 * Names longer than that will be silently truncated. If you
9 * want to disallow this, comment out the following #define.
10 * Creating filesystem objects with longer names will then
11 * result in an error (ENAMETOOLONG).
12 */
13 /*#define AFFS_NO_TRUNCATE */
14
15 /* Ugly macros make the code more pretty. */
16
17 #define GET_END_PTR(st,p,sz) ((st *)((char *)(p)+((sz)-sizeof(st))))
18 #define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
19 #define AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
20
21 #ifdef __LITTLE_ENDIAN
22 #define BO_EXBITS 0x18UL
23 #elif defined(__BIG_ENDIAN)
24 #define BO_EXBITS 0x00UL
25 #else
26 #error Endianness must be known for affs to work.
27 #endif
28
29 #define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data)
30 #define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
31 #define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data)
32 #define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
33 #define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data)
34 #define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data)
35
36 #define AFFS_CACHE_SIZE PAGE_SIZE
37
38 #define AFFS_MAX_PREALLOC 32
39 #define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2)
40 #define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
41 #define AFFS_AC_MASK (AFFS_AC_SIZE-1)
42
43 struct affs_ext_key {
44 u32 ext; /* idx of the extended block */
45 u32 key; /* block number */
46 };
47
48 /*
49 * affs fs inode data in memory
50 */
51 struct affs_inode_info {
52 atomic_t i_opencnt;
53 struct semaphore i_link_lock; /* Protects internal inode access. */
54 struct semaphore i_ext_lock; /* Protects internal inode access. */
55 #define i_hash_lock i_ext_lock
56 u32 i_blkcnt; /* block count */
57 u32 i_extcnt; /* extended block count */
58 u32 *i_lc; /* linear cache of extended blocks */
59 u32 i_lc_size;
60 u32 i_lc_shift;
61 u32 i_lc_mask;
62 struct affs_ext_key *i_ac; /* associative cache of extended blocks */
63 u32 i_ext_last; /* last accessed extended block */
64 struct buffer_head *i_ext_bh; /* bh of last extended block */
65 loff_t mmu_private;
66 u32 i_protect; /* unused attribute bits */
67 u32 i_lastalloc; /* last allocated block */
68 int i_pa_cnt; /* number of preallocated blocks */
69 struct inode vfs_inode;
70 };
71
72 /* short cut to get to the affs specific inode data */
AFFS_I(struct inode * inode)73 static inline struct affs_inode_info *AFFS_I(struct inode *inode)
74 {
75 return list_entry(inode, struct affs_inode_info, vfs_inode);
76 }
77
78 /*
79 * super-block data in memory
80 *
81 * Block numbers are adjusted for their actual size
82 *
83 */
84
85 struct affs_bm_info {
86 u32 bm_key; /* Disk block number */
87 u32 bm_free; /* Free blocks in here */
88 };
89
90 struct affs_sb_info {
91 int s_partition_size; /* Partition size in blocks. */
92 int s_reserved; /* Number of reserved blocks. */
93 //u32 s_blksize; /* Initial device blksize */
94 u32 s_data_blksize; /* size of the data block w/o header */
95 u32 s_root_block; /* FFS root block number. */
96 int s_hashsize; /* Size of hash table. */
97 unsigned long s_flags; /* See below. */
98 uid_t s_uid; /* uid to override */
99 gid_t s_gid; /* gid to override */
100 umode_t s_mode; /* mode to override */
101 struct buffer_head *s_root_bh; /* Cached root block. */
102 struct mutex s_bmlock; /* Protects bitmap access. */
103 struct affs_bm_info *s_bitmap; /* Bitmap infos. */
104 u32 s_bmap_count; /* # of bitmap blocks. */
105 u32 s_bmap_bits; /* # of bits in one bitmap blocks */
106 u32 s_last_bmap;
107 struct buffer_head *s_bmap_bh;
108 char *s_prefix; /* Prefix for volumes and assigns. */
109 char s_volume[32]; /* Volume prefix for absolute symlinks. */
110 spinlock_t symlink_lock; /* protects the previous two */
111 };
112
113 #define SF_INTL 0x0001 /* International filesystem. */
114 #define SF_BM_VALID 0x0002 /* Bitmap is valid. */
115 #define SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */
116 #define SF_QUIET 0x0008 /* chmod errors will be not reported */
117 #define SF_SETUID 0x0010 /* Ignore Amiga uid */
118 #define SF_SETGID 0x0020 /* Ignore Amiga gid */
119 #define SF_SETMODE 0x0040 /* Ignore Amiga protection bits */
120 #define SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */
121 #define SF_OFS 0x0200 /* Old filesystem */
122 #define SF_PREFIX 0x0400 /* Buffer for prefix is allocated */
123 #define SF_VERBOSE 0x0800 /* Talk about fs when mounting */
124
125 /* short cut to get to the affs specific sb data */
AFFS_SB(struct super_block * sb)126 static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
127 {
128 return sb->s_fs_info;
129 }
130
131 /* amigaffs.c */
132
133 extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh);
134 extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
135 extern int affs_remove_header(struct dentry *dentry);
136 extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
137 extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
138 extern void secs_to_datestamp(time_t secs, struct affs_date *ds);
139 extern umode_t prot_to_mode(u32 prot);
140 extern void mode_to_prot(struct inode *inode);
141 extern void affs_error(struct super_block *sb, const char *function, const char *fmt, ...);
142 extern void affs_warning(struct super_block *sb, const char *function, const char *fmt, ...);
143 extern int affs_check_name(const unsigned char *name, int len);
144 extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry);
145
146 /* bitmap. c */
147
148 extern u32 affs_count_free_blocks(struct super_block *s);
149 extern void affs_free_block(struct super_block *sb, u32 block);
150 extern u32 affs_alloc_block(struct inode *inode, u32 goal);
151 extern int affs_init_bitmap(struct super_block *sb, int *flags);
152 extern void affs_free_bitmap(struct super_block *sb);
153
154 /* namei.c */
155
156 extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
157 extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *);
158 extern int affs_unlink(struct inode *dir, struct dentry *dentry);
159 extern int affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, struct nameidata *);
160 extern int affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
161 extern int affs_rmdir(struct inode *dir, struct dentry *dentry);
162 extern int affs_link(struct dentry *olddentry, struct inode *dir,
163 struct dentry *dentry);
164 extern int affs_symlink(struct inode *dir, struct dentry *dentry,
165 const char *symname);
166 extern int affs_rename(struct inode *old_dir, struct dentry *old_dentry,
167 struct inode *new_dir, struct dentry *new_dentry);
168
169 /* inode.c */
170
171 extern unsigned long affs_parent_ino(struct inode *dir);
172 extern struct inode *affs_new_inode(struct inode *dir);
173 extern int affs_notify_change(struct dentry *dentry, struct iattr *attr);
174 extern void affs_evict_inode(struct inode *inode);
175 extern struct inode *affs_iget(struct super_block *sb,
176 unsigned long ino);
177 extern int affs_write_inode(struct inode *inode,
178 struct writeback_control *wbc);
179 extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
180
181 /* file.c */
182
183 void affs_free_prealloc(struct inode *inode);
184 extern void affs_truncate(struct inode *);
185 int affs_file_fsync(struct file *, loff_t, loff_t, int);
186
187 /* dir.c */
188
189 extern void affs_dir_truncate(struct inode *);
190
191 /* jump tables */
192
193 extern const struct inode_operations affs_file_inode_operations;
194 extern const struct inode_operations affs_dir_inode_operations;
195 extern const struct inode_operations affs_symlink_inode_operations;
196 extern const struct file_operations affs_file_operations;
197 extern const struct file_operations affs_file_operations_ofs;
198 extern const struct file_operations affs_dir_operations;
199 extern const struct address_space_operations affs_symlink_aops;
200 extern const struct address_space_operations affs_aops;
201 extern const struct address_space_operations affs_aops_ofs;
202
203 extern const struct dentry_operations affs_dentry_operations;
204 extern const struct dentry_operations affs_intl_dentry_operations;
205
206 static inline void
affs_set_blocksize(struct super_block * sb,int size)207 affs_set_blocksize(struct super_block *sb, int size)
208 {
209 sb_set_blocksize(sb, size);
210 }
211 static inline struct buffer_head *
affs_bread(struct super_block * sb,int block)212 affs_bread(struct super_block *sb, int block)
213 {
214 pr_debug("affs_bread: %d\n", block);
215 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
216 return sb_bread(sb, block);
217 return NULL;
218 }
219 static inline struct buffer_head *
affs_getblk(struct super_block * sb,int block)220 affs_getblk(struct super_block *sb, int block)
221 {
222 pr_debug("affs_getblk: %d\n", block);
223 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
224 return sb_getblk(sb, block);
225 return NULL;
226 }
227 static inline struct buffer_head *
affs_getzeroblk(struct super_block * sb,int block)228 affs_getzeroblk(struct super_block *sb, int block)
229 {
230 struct buffer_head *bh;
231 pr_debug("affs_getzeroblk: %d\n", block);
232 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
233 bh = sb_getblk(sb, block);
234 lock_buffer(bh);
235 memset(bh->b_data, 0 , sb->s_blocksize);
236 set_buffer_uptodate(bh);
237 unlock_buffer(bh);
238 return bh;
239 }
240 return NULL;
241 }
242 static inline struct buffer_head *
affs_getemptyblk(struct super_block * sb,int block)243 affs_getemptyblk(struct super_block *sb, int block)
244 {
245 struct buffer_head *bh;
246 pr_debug("affs_getemptyblk: %d\n", block);
247 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
248 bh = sb_getblk(sb, block);
249 wait_on_buffer(bh);
250 set_buffer_uptodate(bh);
251 return bh;
252 }
253 return NULL;
254 }
255 static inline void
affs_brelse(struct buffer_head * bh)256 affs_brelse(struct buffer_head *bh)
257 {
258 if (bh)
259 pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr);
260 brelse(bh);
261 }
262
263 static inline void
affs_adjust_checksum(struct buffer_head * bh,u32 val)264 affs_adjust_checksum(struct buffer_head *bh, u32 val)
265 {
266 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
267 ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
268 }
269 static inline void
affs_adjust_bitmapchecksum(struct buffer_head * bh,u32 val)270 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
271 {
272 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
273 ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
274 }
275
276 static inline void
affs_lock_link(struct inode * inode)277 affs_lock_link(struct inode *inode)
278 {
279 down(&AFFS_I(inode)->i_link_lock);
280 }
281 static inline void
affs_unlock_link(struct inode * inode)282 affs_unlock_link(struct inode *inode)
283 {
284 up(&AFFS_I(inode)->i_link_lock);
285 }
286 static inline void
affs_lock_dir(struct inode * inode)287 affs_lock_dir(struct inode *inode)
288 {
289 down(&AFFS_I(inode)->i_hash_lock);
290 }
291 static inline void
affs_unlock_dir(struct inode * inode)292 affs_unlock_dir(struct inode *inode)
293 {
294 up(&AFFS_I(inode)->i_hash_lock);
295 }
296 static inline void
affs_lock_ext(struct inode * inode)297 affs_lock_ext(struct inode *inode)
298 {
299 down(&AFFS_I(inode)->i_ext_lock);
300 }
301 static inline void
affs_unlock_ext(struct inode * inode)302 affs_unlock_ext(struct inode *inode)
303 {
304 up(&AFFS_I(inode)->i_ext_lock);
305 }
306