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 AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
18
19 #define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data)
20 #define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
21 #define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data)
22 #define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
23 #define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data)
24 #define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data)
25
26 #define AFFS_CACHE_SIZE PAGE_SIZE
27
28 #define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2)
29 #define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
30 #define AFFS_AC_MASK (AFFS_AC_SIZE-1)
31
32 #define AFFSNAMEMAX 30U
33
34 struct affs_ext_key {
35 u32 ext; /* idx of the extended block */
36 u32 key; /* block number */
37 };
38
39 /*
40 * affs fs inode data in memory
41 */
42 struct affs_inode_info {
43 atomic_t i_opencnt;
44 struct mutex i_link_lock; /* Protects internal inode access. */
45 struct mutex i_ext_lock; /* Protects internal inode access. */
46 #define i_hash_lock i_ext_lock
47 u32 i_blkcnt; /* block count */
48 u32 i_extcnt; /* extended block count */
49 u32 *i_lc; /* linear cache of extended blocks */
50 u32 i_lc_size;
51 u32 i_lc_shift;
52 u32 i_lc_mask;
53 struct affs_ext_key *i_ac; /* associative cache of extended blocks */
54 u32 i_ext_last; /* last accessed extended block */
55 struct buffer_head *i_ext_bh; /* bh of last extended block */
56 loff_t mmu_private;
57 u32 i_protect; /* unused attribute bits */
58 u32 i_lastalloc; /* last allocated block */
59 int i_pa_cnt; /* number of preallocated blocks */
60 struct inode vfs_inode;
61 };
62
63 /* short cut to get to the affs specific inode data */
AFFS_I(struct inode * inode)64 static inline struct affs_inode_info *AFFS_I(struct inode *inode)
65 {
66 return container_of(inode, struct affs_inode_info, vfs_inode);
67 }
68
69 /*
70 * super-block data in memory
71 *
72 * Block numbers are adjusted for their actual size
73 *
74 */
75
76 struct affs_bm_info {
77 u32 bm_key; /* Disk block number */
78 u32 bm_free; /* Free blocks in here */
79 };
80
81 struct affs_sb_info {
82 int s_partition_size; /* Partition size in blocks. */
83 int s_reserved; /* Number of reserved blocks. */
84 //u32 s_blksize; /* Initial device blksize */
85 u32 s_data_blksize; /* size of the data block w/o header */
86 u32 s_root_block; /* FFS root block number. */
87 int s_hashsize; /* Size of hash table. */
88 unsigned long s_flags; /* See below. */
89 kuid_t s_uid; /* uid to override */
90 kgid_t s_gid; /* gid to override */
91 umode_t s_mode; /* mode to override */
92 struct buffer_head *s_root_bh; /* Cached root block. */
93 struct mutex s_bmlock; /* Protects bitmap access. */
94 struct affs_bm_info *s_bitmap; /* Bitmap infos. */
95 u32 s_bmap_count; /* # of bitmap blocks. */
96 u32 s_bmap_bits; /* # of bits in one bitmap blocks */
97 u32 s_last_bmap;
98 struct buffer_head *s_bmap_bh;
99 char *s_prefix; /* Prefix for volumes and assigns. */
100 char s_volume[32]; /* Volume prefix for absolute symlinks. */
101 spinlock_t symlink_lock; /* protects the previous two */
102 struct super_block *sb; /* the VFS superblock object */
103 int work_queued; /* non-zero delayed work is queued */
104 struct delayed_work sb_work; /* superblock flush delayed work */
105 spinlock_t work_lock; /* protects sb_work and work_queued */
106 struct rcu_head rcu;
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 affs_secs_to_datestamp(time64_t secs, struct affs_date *ds);
142 extern umode_t affs_prot_to_mode(u32 prot);
143 extern void affs_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 const struct export_operations affs_export_ops;
166 extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
167 extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);
168 extern int affs_unlink(struct inode *dir, struct dentry *dentry);
169 extern int affs_create(struct mnt_idmap *idmap, struct inode *dir,
170 struct dentry *dentry, umode_t mode, bool);
171 extern int affs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
172 struct dentry *dentry, umode_t mode);
173 extern int affs_rmdir(struct inode *dir, struct dentry *dentry);
174 extern int affs_link(struct dentry *olddentry, struct inode *dir,
175 struct dentry *dentry);
176 extern int affs_symlink(struct mnt_idmap *idmap,
177 struct inode *dir, struct dentry *dentry,
178 const char *symname);
179 extern int affs_rename2(struct mnt_idmap *idmap,
180 struct inode *old_dir, struct dentry *old_dentry,
181 struct inode *new_dir, struct dentry *new_dentry,
182 unsigned int flags);
183
184 /* inode.c */
185
186 extern struct inode *affs_new_inode(struct inode *dir);
187 extern int affs_notify_change(struct mnt_idmap *idmap,
188 struct dentry *dentry, struct iattr *attr);
189 extern void affs_evict_inode(struct inode *inode);
190 extern struct inode *affs_iget(struct super_block *sb,
191 unsigned long ino);
192 extern int affs_write_inode(struct inode *inode,
193 struct writeback_control *wbc);
194 extern int affs_add_entry(struct inode *dir, struct inode *inode,
195 struct dentry *dentry, s32 type);
196
197 /* file.c */
198
199 void affs_free_prealloc(struct inode *inode);
200 extern void affs_truncate(struct inode *);
201 int affs_file_fsync(struct file *, loff_t, loff_t, int);
202
203 /* dir.c */
204
205 extern void affs_dir_truncate(struct inode *);
206
207 /* jump tables */
208
209 extern const struct inode_operations affs_file_inode_operations;
210 extern const struct inode_operations affs_dir_inode_operations;
211 extern const struct inode_operations affs_symlink_inode_operations;
212 extern const struct file_operations affs_file_operations;
213 extern const struct file_operations affs_file_operations_ofs;
214 extern const struct file_operations affs_dir_operations;
215 extern const struct address_space_operations affs_symlink_aops;
216 extern const struct address_space_operations affs_aops;
217 extern const struct address_space_operations affs_aops_ofs;
218
219 extern const struct dentry_operations affs_dentry_operations;
220 extern const struct dentry_operations affs_intl_dentry_operations;
221
affs_validblock(struct super_block * sb,int block)222 static inline bool affs_validblock(struct super_block *sb, int block)
223 {
224 return(block >= AFFS_SB(sb)->s_reserved &&
225 block < AFFS_SB(sb)->s_partition_size);
226 }
227
228 static inline void
affs_set_blocksize(struct super_block * sb,int size)229 affs_set_blocksize(struct super_block *sb, int size)
230 {
231 sb_set_blocksize(sb, size);
232 }
233 static inline struct buffer_head *
affs_bread(struct super_block * sb,int block)234 affs_bread(struct super_block *sb, int block)
235 {
236 pr_debug("%s: %d\n", __func__, block);
237 if (affs_validblock(sb, block))
238 return sb_bread(sb, block);
239 return NULL;
240 }
241 static inline struct buffer_head *
affs_getblk(struct super_block * sb,int block)242 affs_getblk(struct super_block *sb, int block)
243 {
244 pr_debug("%s: %d\n", __func__, block);
245 if (affs_validblock(sb, block))
246 return sb_getblk(sb, block);
247 return NULL;
248 }
249 static inline struct buffer_head *
affs_getzeroblk(struct super_block * sb,int block)250 affs_getzeroblk(struct super_block *sb, int block)
251 {
252 struct buffer_head *bh;
253 pr_debug("%s: %d\n", __func__, block);
254 if (affs_validblock(sb, block)) {
255 bh = sb_getblk(sb, block);
256 lock_buffer(bh);
257 memset(bh->b_data, 0 , sb->s_blocksize);
258 set_buffer_uptodate(bh);
259 unlock_buffer(bh);
260 return bh;
261 }
262 return NULL;
263 }
264 static inline struct buffer_head *
affs_getemptyblk(struct super_block * sb,int block)265 affs_getemptyblk(struct super_block *sb, int block)
266 {
267 struct buffer_head *bh;
268 pr_debug("%s: %d\n", __func__, block);
269 if (affs_validblock(sb, block)) {
270 bh = sb_getblk(sb, block);
271 wait_on_buffer(bh);
272 set_buffer_uptodate(bh);
273 return bh;
274 }
275 return NULL;
276 }
277 static inline void
affs_brelse(struct buffer_head * bh)278 affs_brelse(struct buffer_head *bh)
279 {
280 if (bh)
281 pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr);
282 brelse(bh);
283 }
284
285 static inline void
affs_adjust_checksum(struct buffer_head * bh,u32 val)286 affs_adjust_checksum(struct buffer_head *bh, u32 val)
287 {
288 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
289 ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
290 }
291 static inline void
affs_adjust_bitmapchecksum(struct buffer_head * bh,u32 val)292 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
293 {
294 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
295 ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
296 }
297
298 static inline void
affs_lock_link(struct inode * inode)299 affs_lock_link(struct inode *inode)
300 {
301 mutex_lock(&AFFS_I(inode)->i_link_lock);
302 }
303 static inline void
affs_unlock_link(struct inode * inode)304 affs_unlock_link(struct inode *inode)
305 {
306 mutex_unlock(&AFFS_I(inode)->i_link_lock);
307 }
308 static inline void
affs_lock_dir(struct inode * inode)309 affs_lock_dir(struct inode *inode)
310 {
311 mutex_lock_nested(&AFFS_I(inode)->i_hash_lock, SINGLE_DEPTH_NESTING);
312 }
313 static inline void
affs_unlock_dir(struct inode * inode)314 affs_unlock_dir(struct inode *inode)
315 {
316 mutex_unlock(&AFFS_I(inode)->i_hash_lock);
317 }
318 static inline void
affs_lock_ext(struct inode * inode)319 affs_lock_ext(struct inode *inode)
320 {
321 mutex_lock(&AFFS_I(inode)->i_ext_lock);
322 }
323 static inline void
affs_unlock_ext(struct inode * inode)324 affs_unlock_ext(struct inode *inode)
325 {
326 mutex_unlock(&AFFS_I(inode)->i_ext_lock);
327 }
328