1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifdef pr_fmt |
3 | #undef pr_fmt |
4 | #endif |
5 | |
6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
7 | |
8 | #include <linux/types.h> |
9 | #include <linux/fs.h> |
10 | #include <linux/buffer_head.h> |
11 | #include "amigaffs.h" |
12 | #include <linux/mutex.h> |
13 | #include <linux/workqueue.h> |
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 | #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_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2) |
31 | #define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2) |
32 | #define AFFS_AC_MASK (AFFS_AC_SIZE-1) |
33 | |
34 | #define AFFSNAMEMAX 30U |
35 | |
36 | struct affs_ext_key { |
37 | u32 ext; /* idx of the extended block */ |
38 | u32 key; /* block number */ |
39 | }; |
40 | |
41 | /* |
42 | * affs fs inode data in memory |
43 | */ |
44 | struct affs_inode_info { |
45 | atomic_t i_opencnt; |
46 | struct mutex i_link_lock; /* Protects internal inode access. */ |
47 | struct mutex i_ext_lock; /* Protects internal inode access. */ |
48 | #define i_hash_lock i_ext_lock |
49 | u32 i_blkcnt; /* block count */ |
50 | u32 i_extcnt; /* extended block count */ |
51 | u32 *i_lc; /* linear cache of extended blocks */ |
52 | u32 i_lc_size; |
53 | u32 i_lc_shift; |
54 | u32 i_lc_mask; |
55 | struct affs_ext_key *i_ac; /* associative cache of extended blocks */ |
56 | u32 i_ext_last; /* last accessed extended block */ |
57 | struct buffer_head *i_ext_bh; /* bh of last extended block */ |
58 | loff_t mmu_private; |
59 | u32 i_protect; /* unused attribute bits */ |
60 | u32 i_lastalloc; /* last allocated block */ |
61 | int i_pa_cnt; /* number of preallocated blocks */ |
62 | struct inode vfs_inode; |
63 | }; |
64 | |
65 | /* short cut to get to the affs specific inode data */ |
66 | static inline struct affs_inode_info *AFFS_I(struct inode *inode) |
67 | { |
68 | return container_of(inode, struct affs_inode_info, vfs_inode); |
69 | } |
70 | |
71 | /* |
72 | * super-block data in memory |
73 | * |
74 | * Block numbers are adjusted for their actual size |
75 | * |
76 | */ |
77 | |
78 | struct affs_bm_info { |
79 | u32 bm_key; /* Disk block number */ |
80 | u32 bm_free; /* Free blocks in here */ |
81 | }; |
82 | |
83 | struct affs_sb_info { |
84 | int s_partition_size; /* Partition size in blocks. */ |
85 | int s_reserved; /* Number of reserved blocks. */ |
86 | //u32 s_blksize; /* Initial device blksize */ |
87 | u32 s_data_blksize; /* size of the data block w/o header */ |
88 | u32 s_root_block; /* FFS root block number. */ |
89 | int s_hashsize; /* Size of hash table. */ |
90 | unsigned long s_flags; /* See below. */ |
91 | kuid_t s_uid; /* uid to override */ |
92 | kgid_t s_gid; /* gid to override */ |
93 | umode_t s_mode; /* mode to override */ |
94 | struct buffer_head *s_root_bh; /* Cached root block. */ |
95 | struct mutex s_bmlock; /* Protects bitmap access. */ |
96 | struct affs_bm_info *s_bitmap; /* Bitmap infos. */ |
97 | u32 s_bmap_count; /* # of bitmap blocks. */ |
98 | u32 s_bmap_bits; /* # of bits in one bitmap blocks */ |
99 | u32 s_last_bmap; |
100 | struct buffer_head *s_bmap_bh; |
101 | char *s_prefix; /* Prefix for volumes and assigns. */ |
102 | char s_volume[32]; /* Volume prefix for absolute symlinks. */ |
103 | spinlock_t symlink_lock; /* protects the previous two */ |
104 | struct super_block *sb; /* the VFS superblock object */ |
105 | int work_queued; /* non-zero delayed work is queued */ |
106 | struct delayed_work sb_work; /* superblock flush delayed work */ |
107 | spinlock_t work_lock; /* protects sb_work and work_queued */ |
108 | struct rcu_head rcu; |
109 | }; |
110 | |
111 | #define AFFS_MOUNT_SF_INTL 0x0001 /* International filesystem. */ |
112 | #define AFFS_MOUNT_SF_BM_VALID 0x0002 /* Bitmap is valid. */ |
113 | #define AFFS_MOUNT_SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */ |
114 | #define AFFS_MOUNT_SF_QUIET 0x0008 /* chmod errors will be not reported */ |
115 | #define AFFS_MOUNT_SF_SETUID 0x0010 /* Ignore Amiga uid */ |
116 | #define AFFS_MOUNT_SF_SETGID 0x0020 /* Ignore Amiga gid */ |
117 | #define AFFS_MOUNT_SF_SETMODE 0x0040 /* Ignore Amiga protection bits */ |
118 | #define AFFS_MOUNT_SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */ |
119 | #define AFFS_MOUNT_SF_OFS 0x0200 /* Old filesystem */ |
120 | #define AFFS_MOUNT_SF_PREFIX 0x0400 /* Buffer for prefix is allocated */ |
121 | #define AFFS_MOUNT_SF_VERBOSE 0x0800 /* Talk about fs when mounting */ |
122 | #define AFFS_MOUNT_SF_NO_TRUNCATE 0x1000 /* Don't truncate filenames */ |
123 | |
124 | #define affs_clear_opt(o, opt) (o &= ~AFFS_MOUNT_##opt) |
125 | #define affs_set_opt(o, opt) (o |= AFFS_MOUNT_##opt) |
126 | #define affs_test_opt(o, opt) ((o) & AFFS_MOUNT_##opt) |
127 | |
128 | /* short cut to get to the affs specific sb data */ |
129 | static inline struct affs_sb_info *AFFS_SB(struct super_block *sb) |
130 | { |
131 | return sb->s_fs_info; |
132 | } |
133 | |
134 | void affs_mark_sb_dirty(struct super_block *sb); |
135 | |
136 | /* amigaffs.c */ |
137 | |
138 | extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh); |
139 | extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh); |
140 | extern int (struct dentry *dentry); |
141 | extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh); |
142 | extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh); |
143 | extern void affs_secs_to_datestamp(time64_t secs, struct affs_date *ds); |
144 | extern umode_t affs_prot_to_mode(u32 prot); |
145 | extern void affs_mode_to_prot(struct inode *inode); |
146 | __printf(3, 4) |
147 | extern void affs_error(struct super_block *sb, const char *function, |
148 | const char *fmt, ...); |
149 | __printf(3, 4) |
150 | extern void affs_warning(struct super_block *sb, const char *function, |
151 | const char *fmt, ...); |
152 | extern bool affs_nofilenametruncate(const struct dentry *dentry); |
153 | extern int affs_check_name(const unsigned char *name, int len, |
154 | bool notruncate); |
155 | extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry); |
156 | |
157 | /* bitmap. c */ |
158 | |
159 | extern u32 affs_count_free_blocks(struct super_block *s); |
160 | extern void affs_free_block(struct super_block *sb, u32 block); |
161 | extern u32 affs_alloc_block(struct inode *inode, u32 goal); |
162 | extern int affs_init_bitmap(struct super_block *sb, int *flags); |
163 | extern void affs_free_bitmap(struct super_block *sb); |
164 | |
165 | /* namei.c */ |
166 | |
167 | extern const struct export_operations affs_export_ops; |
168 | extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len); |
169 | extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int); |
170 | extern int affs_unlink(struct inode *dir, struct dentry *dentry); |
171 | extern int affs_create(struct mnt_idmap *idmap, struct inode *dir, |
172 | struct dentry *dentry, umode_t mode, bool); |
173 | extern int affs_mkdir(struct mnt_idmap *idmap, struct inode *dir, |
174 | struct dentry *dentry, umode_t mode); |
175 | extern int affs_rmdir(struct inode *dir, struct dentry *dentry); |
176 | extern int affs_link(struct dentry *olddentry, struct inode *dir, |
177 | struct dentry *dentry); |
178 | extern int affs_symlink(struct mnt_idmap *idmap, |
179 | struct inode *dir, struct dentry *dentry, |
180 | const char *symname); |
181 | extern int affs_rename2(struct mnt_idmap *idmap, |
182 | struct inode *old_dir, struct dentry *old_dentry, |
183 | struct inode *new_dir, struct dentry *new_dentry, |
184 | unsigned int flags); |
185 | |
186 | /* inode.c */ |
187 | |
188 | extern struct inode *affs_new_inode(struct inode *dir); |
189 | extern int affs_notify_change(struct mnt_idmap *idmap, |
190 | struct dentry *dentry, struct iattr *attr); |
191 | extern void affs_evict_inode(struct inode *inode); |
192 | extern struct inode *affs_iget(struct super_block *sb, |
193 | unsigned long ino); |
194 | extern int affs_write_inode(struct inode *inode, |
195 | struct writeback_control *wbc); |
196 | extern int affs_add_entry(struct inode *dir, struct inode *inode, |
197 | struct dentry *dentry, s32 type); |
198 | |
199 | /* file.c */ |
200 | |
201 | void affs_free_prealloc(struct inode *inode); |
202 | extern void affs_truncate(struct inode *); |
203 | int affs_file_fsync(struct file *, loff_t, loff_t, int); |
204 | |
205 | /* dir.c */ |
206 | |
207 | extern void affs_dir_truncate(struct inode *); |
208 | |
209 | /* jump tables */ |
210 | |
211 | extern const struct inode_operations affs_file_inode_operations; |
212 | extern const struct inode_operations affs_dir_inode_operations; |
213 | extern const struct inode_operations affs_symlink_inode_operations; |
214 | extern const struct file_operations affs_file_operations; |
215 | extern const struct file_operations affs_file_operations_ofs; |
216 | extern const struct file_operations affs_dir_operations; |
217 | extern const struct address_space_operations affs_symlink_aops; |
218 | extern const struct address_space_operations affs_aops; |
219 | extern const struct address_space_operations affs_aops_ofs; |
220 | |
221 | extern const struct dentry_operations affs_dentry_operations; |
222 | extern const struct dentry_operations affs_intl_dentry_operations; |
223 | |
224 | static inline bool affs_validblock(struct super_block *sb, int block) |
225 | { |
226 | return(block >= AFFS_SB(sb)->s_reserved && |
227 | block < AFFS_SB(sb)->s_partition_size); |
228 | } |
229 | |
230 | static inline void |
231 | affs_set_blocksize(struct super_block *sb, int size) |
232 | { |
233 | sb_set_blocksize(sb, size); |
234 | } |
235 | static inline struct buffer_head * |
236 | affs_bread(struct super_block *sb, int block) |
237 | { |
238 | pr_debug("%s: %d\n" , __func__, block); |
239 | if (affs_validblock(sb, block)) |
240 | return sb_bread(sb, block); |
241 | return NULL; |
242 | } |
243 | static inline struct buffer_head * |
244 | affs_getblk(struct super_block *sb, int block) |
245 | { |
246 | pr_debug("%s: %d\n" , __func__, block); |
247 | if (affs_validblock(sb, block)) |
248 | return sb_getblk(sb, block); |
249 | return NULL; |
250 | } |
251 | static inline struct buffer_head * |
252 | affs_getzeroblk(struct super_block *sb, int block) |
253 | { |
254 | struct buffer_head *bh; |
255 | pr_debug("%s: %d\n" , __func__, block); |
256 | if (affs_validblock(sb, block)) { |
257 | bh = sb_getblk(sb, block); |
258 | lock_buffer(bh); |
259 | memset(bh->b_data, 0 , sb->s_blocksize); |
260 | set_buffer_uptodate(bh); |
261 | unlock_buffer(bh); |
262 | return bh; |
263 | } |
264 | return NULL; |
265 | } |
266 | static inline struct buffer_head * |
267 | affs_getemptyblk(struct super_block *sb, int block) |
268 | { |
269 | struct buffer_head *bh; |
270 | pr_debug("%s: %d\n" , __func__, block); |
271 | if (affs_validblock(sb, block)) { |
272 | bh = sb_getblk(sb, block); |
273 | wait_on_buffer(bh); |
274 | set_buffer_uptodate(bh); |
275 | return bh; |
276 | } |
277 | return NULL; |
278 | } |
279 | static inline void |
280 | affs_brelse(struct buffer_head *bh) |
281 | { |
282 | if (bh) |
283 | pr_debug("%s: %lld\n" , __func__, (long long) bh->b_blocknr); |
284 | brelse(bh); |
285 | } |
286 | |
287 | static inline void |
288 | affs_adjust_checksum(struct buffer_head *bh, u32 val) |
289 | { |
290 | u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]); |
291 | ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val); |
292 | } |
293 | static inline void |
294 | affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val) |
295 | { |
296 | u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]); |
297 | ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val); |
298 | } |
299 | |
300 | static inline void |
301 | affs_lock_link(struct inode *inode) |
302 | { |
303 | mutex_lock(&AFFS_I(inode)->i_link_lock); |
304 | } |
305 | static inline void |
306 | affs_unlock_link(struct inode *inode) |
307 | { |
308 | mutex_unlock(lock: &AFFS_I(inode)->i_link_lock); |
309 | } |
310 | static inline void |
311 | affs_lock_dir(struct inode *inode) |
312 | { |
313 | mutex_lock_nested(lock: &AFFS_I(inode)->i_hash_lock, SINGLE_DEPTH_NESTING); |
314 | } |
315 | static inline void |
316 | affs_unlock_dir(struct inode *inode) |
317 | { |
318 | mutex_unlock(lock: &AFFS_I(inode)->i_hash_lock); |
319 | } |
320 | static inline void |
321 | affs_lock_ext(struct inode *inode) |
322 | { |
323 | mutex_lock(&AFFS_I(inode)->i_ext_lock); |
324 | } |
325 | static inline void |
326 | affs_unlock_ext(struct inode *inode) |
327 | { |
328 | mutex_unlock(lock: &AFFS_I(inode)->i_ext_lock); |
329 | } |
330 | |