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 };
109
110 #define AFFS_MOUNT_SF_INTL 0x0001 /* International filesystem. */
111 #define AFFS_MOUNT_SF_BM_VALID 0x0002 /* Bitmap is valid. */
112 #define AFFS_MOUNT_SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */
113 #define AFFS_MOUNT_SF_QUIET 0x0008 /* chmod errors will be not reported */
114 #define AFFS_MOUNT_SF_SETUID 0x0010 /* Ignore Amiga uid */
115 #define AFFS_MOUNT_SF_SETGID 0x0020 /* Ignore Amiga gid */
116 #define AFFS_MOUNT_SF_SETMODE 0x0040 /* Ignore Amiga protection bits */
117 #define AFFS_MOUNT_SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */
118 #define AFFS_MOUNT_SF_OFS 0x0200 /* Old filesystem */
119 #define AFFS_MOUNT_SF_PREFIX 0x0400 /* Buffer for prefix is allocated */
120 #define AFFS_MOUNT_SF_VERBOSE 0x0800 /* Talk about fs when mounting */
121 #define AFFS_MOUNT_SF_NO_TRUNCATE 0x1000 /* Don't truncate filenames */
122
123 #define affs_clear_opt(o, opt) (o &= ~AFFS_MOUNT_##opt)
124 #define affs_set_opt(o, opt) (o |= AFFS_MOUNT_##opt)
125 #define affs_test_opt(o, opt) ((o) & AFFS_MOUNT_##opt)
126
127 /* short cut to get to the affs specific sb data */
AFFS_SB(struct super_block * sb)128 static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
129 {
130 return sb->s_fs_info;
131 }
132
133 void affs_mark_sb_dirty(struct super_block *sb);
134
135 /* amigaffs.c */
136
137 extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh);
138 extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
139 extern int affs_remove_header(struct dentry *dentry);
140 extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
141 extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
142 extern void affs_secs_to_datestamp(time64_t secs, struct affs_date *ds);
143 extern umode_t affs_prot_to_mode(u32 prot);
144 extern void affs_mode_to_prot(struct inode *inode);
145 __printf(3, 4)
146 extern void affs_error(struct super_block *sb, const char *function,
147 const char *fmt, ...);
148 __printf(3, 4)
149 extern void affs_warning(struct super_block *sb, const char *function,
150 const char *fmt, ...);
151 extern bool affs_nofilenametruncate(const struct dentry *dentry);
152 extern int affs_check_name(const unsigned char *name, int len,
153 bool notruncate);
154 extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry);
155
156 /* bitmap. c */
157
158 extern u32 affs_count_free_blocks(struct super_block *s);
159 extern void affs_free_block(struct super_block *sb, u32 block);
160 extern u32 affs_alloc_block(struct inode *inode, u32 goal);
161 extern int affs_init_bitmap(struct super_block *sb, int *flags);
162 extern void affs_free_bitmap(struct super_block *sb);
163
164 /* namei.c */
165
166 extern const struct export_operations affs_export_ops;
167 extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
168 extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);
169 extern int affs_unlink(struct inode *dir, struct dentry *dentry);
170 extern int affs_create(struct mnt_idmap *idmap, struct inode *dir,
171 struct dentry *dentry, umode_t mode, bool);
172 extern int affs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
173 struct dentry *dentry, umode_t mode);
174 extern int affs_rmdir(struct inode *dir, struct dentry *dentry);
175 extern int affs_link(struct dentry *olddentry, struct inode *dir,
176 struct dentry *dentry);
177 extern int affs_symlink(struct mnt_idmap *idmap,
178 struct inode *dir, struct dentry *dentry,
179 const char *symname);
180 extern int affs_rename2(struct mnt_idmap *idmap,
181 struct inode *old_dir, struct dentry *old_dentry,
182 struct inode *new_dir, struct dentry *new_dentry,
183 unsigned int flags);
184
185 /* inode.c */
186
187 extern struct inode *affs_new_inode(struct inode *dir);
188 extern int affs_notify_change(struct mnt_idmap *idmap,
189 struct dentry *dentry, struct iattr *attr);
190 extern void affs_evict_inode(struct inode *inode);
191 extern struct inode *affs_iget(struct super_block *sb,
192 unsigned long ino);
193 extern int affs_write_inode(struct inode *inode,
194 struct writeback_control *wbc);
195 extern int affs_add_entry(struct inode *dir, struct inode *inode,
196 struct dentry *dentry, s32 type);
197
198 /* file.c */
199
200 void affs_free_prealloc(struct inode *inode);
201 extern void affs_truncate(struct inode *);
202 int affs_file_fsync(struct file *, loff_t, loff_t, int);
203
204 /* dir.c */
205
206 extern void affs_dir_truncate(struct inode *);
207
208 /* jump tables */
209
210 extern const struct inode_operations affs_file_inode_operations;
211 extern const struct inode_operations affs_dir_inode_operations;
212 extern const struct inode_operations affs_symlink_inode_operations;
213 extern const struct file_operations affs_file_operations;
214 extern const struct file_operations affs_file_operations_ofs;
215 extern const struct file_operations affs_dir_operations;
216 extern const struct address_space_operations affs_symlink_aops;
217 extern const struct address_space_operations affs_aops;
218 extern const struct address_space_operations affs_aops_ofs;
219
220 extern const struct dentry_operations affs_dentry_operations;
221 extern const struct dentry_operations affs_intl_dentry_operations;
222
affs_validblock(struct super_block * sb,int block)223 static inline bool affs_validblock(struct super_block *sb, int block)
224 {
225 return(block >= AFFS_SB(sb)->s_reserved &&
226 block < AFFS_SB(sb)->s_partition_size);
227 }
228
229 static inline void
affs_set_blocksize(struct super_block * sb,int size)230 affs_set_blocksize(struct super_block *sb, int size)
231 {
232 sb_set_blocksize(sb, size);
233 }
234 static inline struct buffer_head *
affs_bread(struct super_block * sb,int block)235 affs_bread(struct super_block *sb, int block)
236 {
237 pr_debug("%s: %d\n", __func__, block);
238 if (affs_validblock(sb, block))
239 return sb_bread(sb, block);
240 return NULL;
241 }
242 static inline struct buffer_head *
affs_getblk(struct super_block * sb,int block)243 affs_getblk(struct super_block *sb, int block)
244 {
245 pr_debug("%s: %d\n", __func__, block);
246 if (affs_validblock(sb, block))
247 return sb_getblk(sb, block);
248 return NULL;
249 }
250 static inline struct buffer_head *
affs_getzeroblk(struct super_block * sb,int block)251 affs_getzeroblk(struct super_block *sb, int block)
252 {
253 struct buffer_head *bh;
254 pr_debug("%s: %d\n", __func__, block);
255 if (affs_validblock(sb, block)) {
256 bh = sb_getblk(sb, block);
257 lock_buffer(bh);
258 memset(bh->b_data, 0 , sb->s_blocksize);
259 set_buffer_uptodate(bh);
260 unlock_buffer(bh);
261 return bh;
262 }
263 return NULL;
264 }
265 static inline struct buffer_head *
affs_getemptyblk(struct super_block * sb,int block)266 affs_getemptyblk(struct super_block *sb, int block)
267 {
268 struct buffer_head *bh;
269 pr_debug("%s: %d\n", __func__, block);
270 if (affs_validblock(sb, block)) {
271 bh = sb_getblk(sb, block);
272 wait_on_buffer(bh);
273 set_buffer_uptodate(bh);
274 return bh;
275 }
276 return NULL;
277 }
278 static inline void
affs_brelse(struct buffer_head * bh)279 affs_brelse(struct buffer_head *bh)
280 {
281 if (bh)
282 pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr);
283 brelse(bh);
284 }
285
286 static inline void
affs_adjust_checksum(struct buffer_head * bh,u32 val)287 affs_adjust_checksum(struct buffer_head *bh, u32 val)
288 {
289 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
290 ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
291 }
292 static inline void
affs_adjust_bitmapchecksum(struct buffer_head * bh,u32 val)293 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
294 {
295 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
296 ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
297 }
298
299 static inline void
affs_lock_link(struct inode * inode)300 affs_lock_link(struct inode *inode)
301 {
302 mutex_lock(&AFFS_I(inode)->i_link_lock);
303 }
304 static inline void
affs_unlock_link(struct inode * inode)305 affs_unlock_link(struct inode *inode)
306 {
307 mutex_unlock(&AFFS_I(inode)->i_link_lock);
308 }
309 static inline void
affs_lock_dir(struct inode * inode)310 affs_lock_dir(struct inode *inode)
311 {
312 mutex_lock_nested(&AFFS_I(inode)->i_hash_lock, SINGLE_DEPTH_NESTING);
313 }
314 static inline void
affs_unlock_dir(struct inode * inode)315 affs_unlock_dir(struct inode *inode)
316 {
317 mutex_unlock(&AFFS_I(inode)->i_hash_lock);
318 }
319 static inline void
affs_lock_ext(struct inode * inode)320 affs_lock_ext(struct inode *inode)
321 {
322 mutex_lock(&AFFS_I(inode)->i_ext_lock);
323 }
324 static inline void
affs_unlock_ext(struct inode * inode)325 affs_unlock_ext(struct inode *inode)
326 {
327 mutex_unlock(&AFFS_I(inode)->i_ext_lock);
328 }
329