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
34struct 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 */
42struct 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 */
64static 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
76struct affs_bm_info {
77 u32 bm_key; /* Disk block number */
78 u32 bm_free; /* Free blocks in here */
79};
80
81struct 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 */
127static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
128{
129 return sb->s_fs_info;
130}
131
132void affs_mark_sb_dirty(struct super_block *sb);
133
134/* amigaffs.c */
135
136extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh);
137extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
138extern int affs_remove_header(struct dentry *dentry);
139extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
140extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
141extern void affs_secs_to_datestamp(time64_t secs, struct affs_date *ds);
142extern umode_t affs_prot_to_mode(u32 prot);
143extern void affs_mode_to_prot(struct inode *inode);
144__printf(3, 4)
145extern void affs_error(struct super_block *sb, const char *function,
146 const char *fmt, ...);
147__printf(3, 4)
148extern void affs_warning(struct super_block *sb, const char *function,
149 const char *fmt, ...);
150extern bool affs_nofilenametruncate(const struct dentry *dentry);
151extern int affs_check_name(const unsigned char *name, int len,
152 bool notruncate);
153extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry);
154
155/* bitmap. c */
156
157extern u32 affs_count_free_blocks(struct super_block *s);
158extern void affs_free_block(struct super_block *sb, u32 block);
159extern u32 affs_alloc_block(struct inode *inode, u32 goal);
160extern int affs_init_bitmap(struct super_block *sb, int *flags);
161extern void affs_free_bitmap(struct super_block *sb);
162
163/* namei.c */
164
165extern const struct export_operations affs_export_ops;
166extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
167extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);
168extern int affs_unlink(struct inode *dir, struct dentry *dentry);
169extern int affs_create(struct mnt_idmap *idmap, struct inode *dir,
170 struct dentry *dentry, umode_t mode, bool);
171extern struct dentry *affs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
172 struct dentry *dentry, umode_t mode);
173extern int affs_rmdir(struct inode *dir, struct dentry *dentry);
174extern int affs_link(struct dentry *olddentry, struct inode *dir,
175 struct dentry *dentry);
176extern int affs_symlink(struct mnt_idmap *idmap,
177 struct inode *dir, struct dentry *dentry,
178 const char *symname);
179extern 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
186extern struct inode *affs_new_inode(struct inode *dir);
187extern int affs_notify_change(struct mnt_idmap *idmap,
188 struct dentry *dentry, struct iattr *attr);
189extern void affs_evict_inode(struct inode *inode);
190extern struct inode *affs_iget(struct super_block *sb,
191 unsigned long ino);
192extern int affs_write_inode(struct inode *inode,
193 struct writeback_control *wbc);
194extern int affs_add_entry(struct inode *dir, struct inode *inode,
195 struct dentry *dentry, s32 type);
196
197/* file.c */
198
199void affs_free_prealloc(struct inode *inode);
200extern void affs_truncate(struct inode *);
201int affs_file_fsync(struct file *, loff_t, loff_t, int);
202
203/* dir.c */
204
205extern void affs_dir_truncate(struct inode *);
206
207/* jump tables */
208
209extern const struct inode_operations affs_file_inode_operations;
210extern const struct inode_operations affs_dir_inode_operations;
211extern const struct inode_operations affs_symlink_inode_operations;
212extern const struct file_operations affs_file_operations;
213extern const struct file_operations affs_file_operations_ofs;
214extern const struct file_operations affs_dir_operations;
215extern const struct address_space_operations affs_symlink_aops;
216extern const struct address_space_operations affs_aops;
217extern const struct address_space_operations affs_aops_ofs;
218
219extern const struct dentry_operations affs_dentry_operations;
220extern const struct dentry_operations affs_intl_dentry_operations;
221
222static 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
228static inline void
229affs_set_blocksize(struct super_block *sb, int size)
230{
231 sb_set_blocksize(sb, size);
232}
233static inline struct buffer_head *
234affs_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}
241static inline struct buffer_head *
242affs_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}
249static inline struct buffer_head *
250affs_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}
264static inline struct buffer_head *
265affs_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}
277static inline void
278affs_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
285static inline void
286affs_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}
291static inline void
292affs_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
298static inline void
299affs_lock_link(struct inode *inode)
300{
301 mutex_lock(&AFFS_I(inode)->i_link_lock);
302}
303static inline void
304affs_unlock_link(struct inode *inode)
305{
306 mutex_unlock(lock: &AFFS_I(inode)->i_link_lock);
307}
308static inline void
309affs_lock_dir(struct inode *inode)
310{
311 mutex_lock_nested(lock: &AFFS_I(inode)->i_hash_lock, SINGLE_DEPTH_NESTING);
312}
313static inline void
314affs_unlock_dir(struct inode *inode)
315{
316 mutex_unlock(lock: &AFFS_I(inode)->i_hash_lock);
317}
318static inline void
319affs_lock_ext(struct inode *inode)
320{
321 mutex_lock(&AFFS_I(inode)->i_ext_lock);
322}
323static inline void
324affs_unlock_ext(struct inode *inode)
325{
326 mutex_unlock(lock: &AFFS_I(inode)->i_ext_lock);
327}
328

source code of linux/fs/affs/affs.h