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TOMOYO Linux Cross Reference
Linux/fs/affs/affs.h

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  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 semaphore i_link_lock;           /* Protects internal inode access. */
 47         struct semaphore 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 };
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 */
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 inode *dir, struct dentry *dentry, umode_t mode, bool);
171 extern int      affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
172 extern int      affs_rmdir(struct inode *dir, struct dentry *dentry);
173 extern int      affs_link(struct dentry *olddentry, struct inode *dir,
174                           struct dentry *dentry);
175 extern int      affs_symlink(struct inode *dir, struct dentry *dentry,
176                              const char *symname);
177 extern int      affs_rename2(struct inode *old_dir, struct dentry *old_dentry,
178                             struct inode *new_dir, struct dentry *new_dentry,
179                             unsigned int flags);
180 
181 /* inode.c */
182 
183 extern struct inode             *affs_new_inode(struct inode *dir);
184 extern int                       affs_notify_change(struct dentry *dentry, struct iattr *attr);
185 extern void                      affs_evict_inode(struct inode *inode);
186 extern struct inode             *affs_iget(struct super_block *sb,
187                                         unsigned long ino);
188 extern int                       affs_write_inode(struct inode *inode,
189                                         struct writeback_control *wbc);
190 extern int                       affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
191 
192 /* file.c */
193 
194 void            affs_free_prealloc(struct inode *inode);
195 extern void     affs_truncate(struct inode *);
196 int             affs_file_fsync(struct file *, loff_t, loff_t, int);
197 
198 /* dir.c */
199 
200 extern void   affs_dir_truncate(struct inode *);
201 
202 /* jump tables */
203 
204 extern const struct inode_operations     affs_file_inode_operations;
205 extern const struct inode_operations     affs_dir_inode_operations;
206 extern const struct inode_operations   affs_symlink_inode_operations;
207 extern const struct file_operations      affs_file_operations;
208 extern const struct file_operations      affs_file_operations_ofs;
209 extern const struct file_operations      affs_dir_operations;
210 extern const struct address_space_operations     affs_symlink_aops;
211 extern const struct address_space_operations     affs_aops;
212 extern const struct address_space_operations     affs_aops_ofs;
213 
214 extern const struct dentry_operations    affs_dentry_operations;
215 extern const struct dentry_operations    affs_intl_dentry_operations;
216 
217 static inline bool affs_validblock(struct super_block *sb, int block)
218 {
219         return(block >= AFFS_SB(sb)->s_reserved &&
220                block < AFFS_SB(sb)->s_partition_size);
221 }
222 
223 static inline void
224 affs_set_blocksize(struct super_block *sb, int size)
225 {
226         sb_set_blocksize(sb, size);
227 }
228 static inline struct buffer_head *
229 affs_bread(struct super_block *sb, int block)
230 {
231         pr_debug("%s: %d\n", __func__, block);
232         if (affs_validblock(sb, block))
233                 return sb_bread(sb, block);
234         return NULL;
235 }
236 static inline struct buffer_head *
237 affs_getblk(struct super_block *sb, int block)
238 {
239         pr_debug("%s: %d\n", __func__, block);
240         if (affs_validblock(sb, block))
241                 return sb_getblk(sb, block);
242         return NULL;
243 }
244 static inline struct buffer_head *
245 affs_getzeroblk(struct super_block *sb, int block)
246 {
247         struct buffer_head *bh;
248         pr_debug("%s: %d\n", __func__, block);
249         if (affs_validblock(sb, block)) {
250                 bh = sb_getblk(sb, block);
251                 lock_buffer(bh);
252                 memset(bh->b_data, 0 , sb->s_blocksize);
253                 set_buffer_uptodate(bh);
254                 unlock_buffer(bh);
255                 return bh;
256         }
257         return NULL;
258 }
259 static inline struct buffer_head *
260 affs_getemptyblk(struct super_block *sb, int block)
261 {
262         struct buffer_head *bh;
263         pr_debug("%s: %d\n", __func__, block);
264         if (affs_validblock(sb, block)) {
265                 bh = sb_getblk(sb, block);
266                 wait_on_buffer(bh);
267                 set_buffer_uptodate(bh);
268                 return bh;
269         }
270         return NULL;
271 }
272 static inline void
273 affs_brelse(struct buffer_head *bh)
274 {
275         if (bh)
276                 pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr);
277         brelse(bh);
278 }
279 
280 static inline void
281 affs_adjust_checksum(struct buffer_head *bh, u32 val)
282 {
283         u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
284         ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
285 }
286 static inline void
287 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
288 {
289         u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
290         ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
291 }
292 
293 static inline void
294 affs_lock_link(struct inode *inode)
295 {
296         down(&AFFS_I(inode)->i_link_lock);
297 }
298 static inline void
299 affs_unlock_link(struct inode *inode)
300 {
301         up(&AFFS_I(inode)->i_link_lock);
302 }
303 static inline void
304 affs_lock_dir(struct inode *inode)
305 {
306         down(&AFFS_I(inode)->i_hash_lock);
307 }
308 static inline void
309 affs_unlock_dir(struct inode *inode)
310 {
311         up(&AFFS_I(inode)->i_hash_lock);
312 }
313 static inline void
314 affs_lock_ext(struct inode *inode)
315 {
316         down(&AFFS_I(inode)->i_ext_lock);
317 }
318 static inline void
319 affs_unlock_ext(struct inode *inode)
320 {
321         up(&AFFS_I(inode)->i_ext_lock);
322 }
323 

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