1 #ifdef pr_fmt 2 #undef pr_fmt 3 #endif 4 5 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 6 7 #include <linux/types.h> 8 #include <linux/fs.h> 9 #include <linux/buffer_head.h> 10 #include <linux/amigaffs.h> 11 #include <linux/mutex.h> 12 #include <linux/workqueue.h> 13 14 /* Ugly macros make the code more pretty. */ 15 16 #define GET_END_PTR(st,p,sz) ((st *)((char *)(p)+((sz)-sizeof(st)))) 17 #define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey]) 18 #define AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)]) 19 20 #define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data) 21 #define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail))) 22 #define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data) 23 #define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail))) 24 #define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data) 25 #define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data) 26 27 #define AFFS_CACHE_SIZE PAGE_SIZE 28 29 #define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2) 30 #define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2) 31 #define AFFS_AC_MASK (AFFS_AC_SIZE-1) 32 33 #define AFFSNAMEMAX 30U 34 35 struct affs_ext_key { 36 u32 ext; /* idx of the extended block */ 37 u32 key; /* block number */ 38 }; 39 40 /* 41 * affs fs inode data in memory 42 */ 43 struct affs_inode_info { 44 atomic_t i_opencnt; 45 struct semaphore i_link_lock; /* Protects internal inode access. */ 46 struct semaphore i_ext_lock; /* Protects internal inode access. */ 47 #define i_hash_lock i_ext_lock 48 u32 i_blkcnt; /* block count */ 49 u32 i_extcnt; /* extended block count */ 50 u32 *i_lc; /* linear cache of extended blocks */ 51 u32 i_lc_size; 52 u32 i_lc_shift; 53 u32 i_lc_mask; 54 struct affs_ext_key *i_ac; /* associative cache of extended blocks */ 55 u32 i_ext_last; /* last accessed extended block */ 56 struct buffer_head *i_ext_bh; /* bh of last extended block */ 57 loff_t mmu_private; 58 u32 i_protect; /* unused attribute bits */ 59 u32 i_lastalloc; /* last allocated block */ 60 int i_pa_cnt; /* number of preallocated blocks */ 61 struct inode vfs_inode; 62 }; 63 64 /* short cut to get to the affs specific inode data */ 65 static inline struct affs_inode_info *AFFS_I(struct inode *inode) 66 { 67 return container_of(inode, struct affs_inode_info, vfs_inode); 68 } 69 70 /* 71 * super-block data in memory 72 * 73 * Block numbers are adjusted for their actual size 74 * 75 */ 76 77 struct affs_bm_info { 78 u32 bm_key; /* Disk block number */ 79 u32 bm_free; /* Free blocks in here */ 80 }; 81 82 struct affs_sb_info { 83 int s_partition_size; /* Partition size in blocks. */ 84 int s_reserved; /* Number of reserved blocks. */ 85 //u32 s_blksize; /* Initial device blksize */ 86 u32 s_data_blksize; /* size of the data block w/o header */ 87 u32 s_root_block; /* FFS root block number. */ 88 int s_hashsize; /* Size of hash table. */ 89 unsigned long s_flags; /* See below. */ 90 kuid_t s_uid; /* uid to override */ 91 kgid_t s_gid; /* gid to override */ 92 umode_t s_mode; /* mode to override */ 93 struct buffer_head *s_root_bh; /* Cached root block. */ 94 struct mutex s_bmlock; /* Protects bitmap access. */ 95 struct affs_bm_info *s_bitmap; /* Bitmap infos. */ 96 u32 s_bmap_count; /* # of bitmap blocks. */ 97 u32 s_bmap_bits; /* # of bits in one bitmap blocks */ 98 u32 s_last_bmap; 99 struct buffer_head *s_bmap_bh; 100 char *s_prefix; /* Prefix for volumes and assigns. */ 101 char s_volume[32]; /* Volume prefix for absolute symlinks. */ 102 spinlock_t symlink_lock; /* protects the previous two */ 103 struct super_block *sb; /* the VFS superblock object */ 104 int work_queued; /* non-zero delayed work is queued */ 105 struct delayed_work sb_work; /* superblock flush delayed work */ 106 spinlock_t work_lock; /* protects sb_work and work_queued */ 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 */ 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 inode *dir, struct dentry *dentry, umode_t mode, bool); 170 extern int affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); 171 extern int affs_rmdir(struct inode *dir, struct dentry *dentry); 172 extern int affs_link(struct dentry *olddentry, struct inode *dir, 173 struct dentry *dentry); 174 extern int affs_symlink(struct inode *dir, struct dentry *dentry, 175 const char *symname); 176 extern int affs_rename(struct inode *old_dir, struct dentry *old_dentry, 177 struct inode *new_dir, struct dentry *new_dentry, 178 unsigned int flags); 179 180 /* inode.c */ 181 182 extern struct inode *affs_new_inode(struct inode *dir); 183 extern int affs_notify_change(struct dentry *dentry, struct iattr *attr); 184 extern void affs_evict_inode(struct inode *inode); 185 extern struct inode *affs_iget(struct super_block *sb, 186 unsigned long ino); 187 extern int affs_write_inode(struct inode *inode, 188 struct writeback_control *wbc); 189 extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type); 190 191 /* file.c */ 192 193 void affs_free_prealloc(struct inode *inode); 194 extern void affs_truncate(struct inode *); 195 int affs_file_fsync(struct file *, loff_t, loff_t, int); 196 197 /* dir.c */ 198 199 extern void affs_dir_truncate(struct inode *); 200 201 /* jump tables */ 202 203 extern const struct inode_operations affs_file_inode_operations; 204 extern const struct inode_operations affs_dir_inode_operations; 205 extern const struct inode_operations affs_symlink_inode_operations; 206 extern const struct file_operations affs_file_operations; 207 extern const struct file_operations affs_file_operations_ofs; 208 extern const struct file_operations affs_dir_operations; 209 extern const struct address_space_operations affs_symlink_aops; 210 extern const struct address_space_operations affs_aops; 211 extern const struct address_space_operations affs_aops_ofs; 212 213 extern const struct dentry_operations affs_dentry_operations; 214 extern const struct dentry_operations affs_intl_dentry_operations; 215 216 static inline bool affs_validblock(struct super_block *sb, int block) 217 { 218 return(block >= AFFS_SB(sb)->s_reserved && 219 block < AFFS_SB(sb)->s_partition_size); 220 } 221 222 static inline void 223 affs_set_blocksize(struct super_block *sb, int size) 224 { 225 sb_set_blocksize(sb, size); 226 } 227 static inline struct buffer_head * 228 affs_bread(struct super_block *sb, int block) 229 { 230 pr_debug("%s: %d\n", __func__, block); 231 if (affs_validblock(sb, block)) 232 return sb_bread(sb, block); 233 return NULL; 234 } 235 static inline struct buffer_head * 236 affs_getblk(struct super_block *sb, int block) 237 { 238 pr_debug("%s: %d\n", __func__, block); 239 if (affs_validblock(sb, block)) 240 return sb_getblk(sb, block); 241 return NULL; 242 } 243 static inline struct buffer_head * 244 affs_getzeroblk(struct super_block *sb, int block) 245 { 246 struct buffer_head *bh; 247 pr_debug("%s: %d\n", __func__, block); 248 if (affs_validblock(sb, block)) { 249 bh = sb_getblk(sb, block); 250 lock_buffer(bh); 251 memset(bh->b_data, 0 , sb->s_blocksize); 252 set_buffer_uptodate(bh); 253 unlock_buffer(bh); 254 return bh; 255 } 256 return NULL; 257 } 258 static inline struct buffer_head * 259 affs_getemptyblk(struct super_block *sb, int block) 260 { 261 struct buffer_head *bh; 262 pr_debug("%s: %d\n", __func__, block); 263 if (affs_validblock(sb, block)) { 264 bh = sb_getblk(sb, block); 265 wait_on_buffer(bh); 266 set_buffer_uptodate(bh); 267 return bh; 268 } 269 return NULL; 270 } 271 static inline void 272 affs_brelse(struct buffer_head *bh) 273 { 274 if (bh) 275 pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr); 276 brelse(bh); 277 } 278 279 static inline void 280 affs_adjust_checksum(struct buffer_head *bh, u32 val) 281 { 282 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]); 283 ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val); 284 } 285 static inline void 286 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val) 287 { 288 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]); 289 ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val); 290 } 291 292 static inline void 293 affs_lock_link(struct inode *inode) 294 { 295 down(&AFFS_I(inode)->i_link_lock); 296 } 297 static inline void 298 affs_unlock_link(struct inode *inode) 299 { 300 up(&AFFS_I(inode)->i_link_lock); 301 } 302 static inline void 303 affs_lock_dir(struct inode *inode) 304 { 305 down(&AFFS_I(inode)->i_hash_lock); 306 } 307 static inline void 308 affs_unlock_dir(struct inode *inode) 309 { 310 up(&AFFS_I(inode)->i_hash_lock); 311 } 312 static inline void 313 affs_lock_ext(struct inode *inode) 314 { 315 down(&AFFS_I(inode)->i_ext_lock); 316 } 317 static inline void 318 affs_unlock_ext(struct inode *inode) 319 { 320 up(&AFFS_I(inode)->i_ext_lock); 321 } 322