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1da177e4 LT |
1 | #include <linux/types.h> |
2 | #include <linux/fs.h> | |
3 | #include <linux/buffer_head.h> | |
1da177e4 | 4 | #include <linux/amigaffs.h> |
7d135a5d | 5 | #include <linux/mutex.h> |
1da177e4 LT |
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 | ||
1da177e4 LT |
21 | #define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data) |
22 | #define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail))) | |
23 | #define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data) | |
24 | #define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail))) | |
25 | #define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data) | |
26 | #define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data) | |
27 | ||
28 | #define AFFS_CACHE_SIZE PAGE_SIZE | |
29 | ||
30 | #define AFFS_MAX_PREALLOC 32 | |
31 | #define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2) | |
32 | #define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2) | |
33 | #define AFFS_AC_MASK (AFFS_AC_SIZE-1) | |
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 { | |
dca3c336 | 44 | atomic_t i_opencnt; |
1da177e4 LT |
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 */ | |
65 | static inline struct affs_inode_info *AFFS_I(struct inode *inode) | |
66 | { | |
67 | return list_entry(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 | uid_t s_uid; /* uid to override */ | |
91 | gid_t s_gid; /* gid to override */ | |
92 | umode_t s_mode; /* mode to override */ | |
93 | struct buffer_head *s_root_bh; /* Cached root block. */ | |
7d135a5d | 94 | struct mutex s_bmlock; /* Protects bitmap access. */ |
1da177e4 LT |
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. */ | |
1da177e4 | 101 | char s_volume[32]; /* Volume prefix for absolute symlinks. */ |
29333920 | 102 | spinlock_t symlink_lock; /* protects the previous two */ |
1da177e4 LT |
103 | }; |
104 | ||
105 | #define SF_INTL 0x0001 /* International filesystem. */ | |
106 | #define SF_BM_VALID 0x0002 /* Bitmap is valid. */ | |
107 | #define SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */ | |
108 | #define SF_QUIET 0x0008 /* chmod errors will be not reported */ | |
109 | #define SF_SETUID 0x0010 /* Ignore Amiga uid */ | |
110 | #define SF_SETGID 0x0020 /* Ignore Amiga gid */ | |
111 | #define SF_SETMODE 0x0040 /* Ignore Amiga protection bits */ | |
112 | #define SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */ | |
113 | #define SF_OFS 0x0200 /* Old filesystem */ | |
114 | #define SF_PREFIX 0x0400 /* Buffer for prefix is allocated */ | |
115 | #define SF_VERBOSE 0x0800 /* Talk about fs when mounting */ | |
116 | ||
117 | /* short cut to get to the affs specific sb data */ | |
118 | static inline struct affs_sb_info *AFFS_SB(struct super_block *sb) | |
119 | { | |
120 | return sb->s_fs_info; | |
121 | } | |
122 | ||
123 | /* amigaffs.c */ | |
124 | ||
125 | extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh); | |
126 | extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh); | |
127 | extern int affs_remove_header(struct dentry *dentry); | |
128 | extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh); | |
129 | extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh); | |
130 | extern void secs_to_datestamp(time_t secs, struct affs_date *ds); | |
a760b03d | 131 | extern umode_t prot_to_mode(u32 prot); |
1da177e4 LT |
132 | extern void mode_to_prot(struct inode *inode); |
133 | extern void affs_error(struct super_block *sb, const char *function, const char *fmt, ...); | |
134 | extern void affs_warning(struct super_block *sb, const char *function, const char *fmt, ...); | |
135 | extern int affs_check_name(const unsigned char *name, int len); | |
136 | extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry); | |
137 | ||
138 | /* bitmap. c */ | |
139 | ||
140 | extern u32 affs_count_free_blocks(struct super_block *s); | |
141 | extern void affs_free_block(struct super_block *sb, u32 block); | |
142 | extern u32 affs_alloc_block(struct inode *inode, u32 goal); | |
143 | extern int affs_init_bitmap(struct super_block *sb, int *flags); | |
144 | extern void affs_free_bitmap(struct super_block *sb); | |
145 | ||
146 | /* namei.c */ | |
147 | ||
148 | extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len); | |
149 | extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *); | |
150 | extern int affs_unlink(struct inode *dir, struct dentry *dentry); | |
4acdaf27 | 151 | extern int affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, struct nameidata *); |
18bb1db3 | 152 | extern int affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); |
1da177e4 LT |
153 | extern int affs_rmdir(struct inode *dir, struct dentry *dentry); |
154 | extern int affs_link(struct dentry *olddentry, struct inode *dir, | |
155 | struct dentry *dentry); | |
156 | extern int affs_symlink(struct inode *dir, struct dentry *dentry, | |
157 | const char *symname); | |
158 | extern int affs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
159 | struct inode *new_dir, struct dentry *new_dentry); | |
160 | ||
161 | /* inode.c */ | |
162 | ||
163 | extern unsigned long affs_parent_ino(struct inode *dir); | |
164 | extern struct inode *affs_new_inode(struct inode *dir); | |
165 | extern int affs_notify_change(struct dentry *dentry, struct iattr *attr); | |
f053ddde | 166 | extern void affs_evict_inode(struct inode *inode); |
210f8559 DH |
167 | extern struct inode *affs_iget(struct super_block *sb, |
168 | unsigned long ino); | |
a9185b41 CH |
169 | extern int affs_write_inode(struct inode *inode, |
170 | struct writeback_control *wbc); | |
1da177e4 LT |
171 | extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type); |
172 | ||
173 | /* file.c */ | |
174 | ||
175 | void affs_free_prealloc(struct inode *inode); | |
176 | extern void affs_truncate(struct inode *); | |
02c24a82 | 177 | int affs_file_fsync(struct file *, loff_t, loff_t, int); |
1da177e4 LT |
178 | |
179 | /* dir.c */ | |
180 | ||
181 | extern void affs_dir_truncate(struct inode *); | |
182 | ||
183 | /* jump tables */ | |
184 | ||
754661f1 AV |
185 | extern const struct inode_operations affs_file_inode_operations; |
186 | extern const struct inode_operations affs_dir_inode_operations; | |
187 | extern const struct inode_operations affs_symlink_inode_operations; | |
4b6f5d20 AV |
188 | extern const struct file_operations affs_file_operations; |
189 | extern const struct file_operations affs_file_operations_ofs; | |
190 | extern const struct file_operations affs_dir_operations; | |
f5e54d6e CH |
191 | extern const struct address_space_operations affs_symlink_aops; |
192 | extern const struct address_space_operations affs_aops; | |
193 | extern const struct address_space_operations affs_aops_ofs; | |
1da177e4 | 194 | |
e16404ed | 195 | extern const struct dentry_operations affs_dentry_operations; |
a129880d | 196 | extern const struct dentry_operations affs_intl_dentry_operations; |
1da177e4 LT |
197 | |
198 | static inline void | |
199 | affs_set_blocksize(struct super_block *sb, int size) | |
200 | { | |
201 | sb_set_blocksize(sb, size); | |
202 | } | |
203 | static inline struct buffer_head * | |
204 | affs_bread(struct super_block *sb, int block) | |
205 | { | |
206 | pr_debug("affs_bread: %d\n", block); | |
207 | if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) | |
208 | return sb_bread(sb, block); | |
209 | return NULL; | |
210 | } | |
211 | static inline struct buffer_head * | |
212 | affs_getblk(struct super_block *sb, int block) | |
213 | { | |
214 | pr_debug("affs_getblk: %d\n", block); | |
215 | if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) | |
216 | return sb_getblk(sb, block); | |
217 | return NULL; | |
218 | } | |
219 | static inline struct buffer_head * | |
220 | affs_getzeroblk(struct super_block *sb, int block) | |
221 | { | |
222 | struct buffer_head *bh; | |
223 | pr_debug("affs_getzeroblk: %d\n", block); | |
224 | if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) { | |
225 | bh = sb_getblk(sb, block); | |
226 | lock_buffer(bh); | |
227 | memset(bh->b_data, 0 , sb->s_blocksize); | |
228 | set_buffer_uptodate(bh); | |
229 | unlock_buffer(bh); | |
230 | return bh; | |
231 | } | |
232 | return NULL; | |
233 | } | |
234 | static inline struct buffer_head * | |
235 | affs_getemptyblk(struct super_block *sb, int block) | |
236 | { | |
237 | struct buffer_head *bh; | |
238 | pr_debug("affs_getemptyblk: %d\n", block); | |
239 | if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) { | |
240 | bh = sb_getblk(sb, block); | |
241 | wait_on_buffer(bh); | |
242 | set_buffer_uptodate(bh); | |
243 | return bh; | |
244 | } | |
245 | return NULL; | |
246 | } | |
247 | static inline void | |
248 | affs_brelse(struct buffer_head *bh) | |
249 | { | |
250 | if (bh) | |
251 | pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr); | |
252 | brelse(bh); | |
253 | } | |
254 | ||
255 | static inline void | |
256 | affs_adjust_checksum(struct buffer_head *bh, u32 val) | |
257 | { | |
258 | u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]); | |
259 | ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val); | |
260 | } | |
261 | static inline void | |
262 | affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val) | |
263 | { | |
264 | u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]); | |
265 | ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val); | |
266 | } | |
267 | ||
268 | static inline void | |
269 | affs_lock_link(struct inode *inode) | |
270 | { | |
271 | down(&AFFS_I(inode)->i_link_lock); | |
272 | } | |
273 | static inline void | |
274 | affs_unlock_link(struct inode *inode) | |
275 | { | |
276 | up(&AFFS_I(inode)->i_link_lock); | |
277 | } | |
278 | static inline void | |
279 | affs_lock_dir(struct inode *inode) | |
280 | { | |
281 | down(&AFFS_I(inode)->i_hash_lock); | |
282 | } | |
283 | static inline void | |
284 | affs_unlock_dir(struct inode *inode) | |
285 | { | |
286 | up(&AFFS_I(inode)->i_hash_lock); | |
287 | } | |
288 | static inline void | |
289 | affs_lock_ext(struct inode *inode) | |
290 | { | |
291 | down(&AFFS_I(inode)->i_ext_lock); | |
292 | } | |
293 | static inline void | |
294 | affs_unlock_ext(struct inode *inode) | |
295 | { | |
296 | up(&AFFS_I(inode)->i_ext_lock); | |
297 | } |