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 */
AFFS_I(struct inode * inode)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 */
AFFS_SB(struct super_block * sb)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 affs_remove_header(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
affs_validblock(struct super_block * sb,int block)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
affs_set_blocksize(struct super_block * sb,int size)231 affs_set_blocksize(struct super_block *sb, int size)
232 {
233 sb_set_blocksize(sb, size);
234 }
235 static inline struct buffer_head *
affs_bread(struct super_block * sb,int block)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 *
affs_getblk(struct super_block * sb,int block)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 *
affs_getzeroblk(struct super_block * sb,int block)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 *
affs_getemptyblk(struct super_block * sb,int block)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
affs_brelse(struct buffer_head * bh)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
affs_adjust_checksum(struct buffer_head * bh,u32 val)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
affs_adjust_bitmapchecksum(struct buffer_head * bh,u32 val)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
affs_lock_link(struct inode * inode)301 affs_lock_link(struct inode *inode)
302 {
303 mutex_lock(&AFFS_I(inode)->i_link_lock);
304 }
305 static inline void
affs_unlock_link(struct inode * inode)306 affs_unlock_link(struct inode *inode)
307 {
308 mutex_unlock(&AFFS_I(inode)->i_link_lock);
309 }
310 static inline void
affs_lock_dir(struct inode * inode)311 affs_lock_dir(struct inode *inode)
312 {
313 mutex_lock_nested(&AFFS_I(inode)->i_hash_lock, SINGLE_DEPTH_NESTING);
314 }
315 static inline void
affs_unlock_dir(struct inode * inode)316 affs_unlock_dir(struct inode *inode)
317 {
318 mutex_unlock(&AFFS_I(inode)->i_hash_lock);
319 }
320 static inline void
affs_lock_ext(struct inode * inode)321 affs_lock_ext(struct inode *inode)
322 {
323 mutex_lock(&AFFS_I(inode)->i_ext_lock);
324 }
325 static inline void
affs_unlock_ext(struct inode * inode)326 affs_unlock_ext(struct inode *inode)
327 {
328 mutex_unlock(&AFFS_I(inode)->i_ext_lock);
329 }
330