1 #include <linux/types.h> 2 #include <linux/fs.h> 3 #include <linux/buffer_head.h> 4 #include <linux/amigaffs.h> 5 #include <linux/mutex.h> 6 7 /* AmigaOS allows file names with up to 30 characters length. 8 * Names longer than that will be silently truncated. If you 9 * want to disallow this, comment out the following #define. 10 * Creating filesystem objects with longer names will then 11 * result in an error (ENAMETOOLONG). 12 */ 13 /*#define AFFS_NO_TRUNCATE */ 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 #ifdef __LITTLE_ENDIAN 22 #define BO_EXBITS 0x18UL 23 #elif defined(__BIG_ENDIAN) 24 #define BO_EXBITS 0x00UL 25 #else 26 #error Endianness must be known for affs to work. 27 #endif 28 29 #define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data) 30 #define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail))) 31 #define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data) 32 #define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail))) 33 #define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data) 34 #define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data) 35 36 #define AFFS_CACHE_SIZE PAGE_SIZE 37 38 #define AFFS_MAX_PREALLOC 32 39 #define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2) 40 #define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2) 41 #define AFFS_AC_MASK (AFFS_AC_SIZE-1) 42 43 struct affs_ext_key { 44 u32 ext; /* idx of the extended block */ 45 u32 key; /* block number */ 46 }; 47 48 /* 49 * affs fs inode data in memory 50 */ 51 struct affs_inode_info { 52 atomic_t i_opencnt; 53 struct semaphore i_link_lock; /* Protects internal inode access. */ 54 struct semaphore i_ext_lock; /* Protects internal inode access. */ 55 #define i_hash_lock i_ext_lock 56 u32 i_blkcnt; /* block count */ 57 u32 i_extcnt; /* extended block count */ 58 u32 *i_lc; /* linear cache of extended blocks */ 59 u32 i_lc_size; 60 u32 i_lc_shift; 61 u32 i_lc_mask; 62 struct affs_ext_key *i_ac; /* associative cache of extended blocks */ 63 u32 i_ext_last; /* last accessed extended block */ 64 struct buffer_head *i_ext_bh; /* bh of last extended block */ 65 loff_t mmu_private; 66 u32 i_protect; /* unused attribute bits */ 67 u32 i_lastalloc; /* last allocated block */ 68 int i_pa_cnt; /* number of preallocated blocks */ 69 struct inode vfs_inode; 70 }; 71 72 /* short cut to get to the affs specific inode data */ 73 static inline struct affs_inode_info *AFFS_I(struct inode *inode) 74 { 75 return list_entry(inode, struct affs_inode_info, vfs_inode); 76 } 77 78 /* 79 * super-block data in memory 80 * 81 * Block numbers are adjusted for their actual size 82 * 83 */ 84 85 struct affs_bm_info { 86 u32 bm_key; /* Disk block number */ 87 u32 bm_free; /* Free blocks in here */ 88 }; 89 90 struct affs_sb_info { 91 int s_partition_size; /* Partition size in blocks. */ 92 int s_reserved; /* Number of reserved blocks. */ 93 //u32 s_blksize; /* Initial device blksize */ 94 u32 s_data_blksize; /* size of the data block w/o header */ 95 u32 s_root_block; /* FFS root block number. */ 96 int s_hashsize; /* Size of hash table. */ 97 unsigned long s_flags; /* See below. */ 98 uid_t s_uid; /* uid to override */ 99 gid_t s_gid; /* gid to override */ 100 umode_t s_mode; /* mode to override */ 101 struct buffer_head *s_root_bh; /* Cached root block. */ 102 struct mutex s_bmlock; /* Protects bitmap access. */ 103 struct affs_bm_info *s_bitmap; /* Bitmap infos. */ 104 u32 s_bmap_count; /* # of bitmap blocks. */ 105 u32 s_bmap_bits; /* # of bits in one bitmap blocks */ 106 u32 s_last_bmap; 107 struct buffer_head *s_bmap_bh; 108 char *s_prefix; /* Prefix for volumes and assigns. */ 109 char s_volume[32]; /* Volume prefix for absolute symlinks. */ 110 spinlock_t symlink_lock; /* protects the previous two */ 111 }; 112 113 #define SF_INTL 0x0001 /* International filesystem. */ 114 #define SF_BM_VALID 0x0002 /* Bitmap is valid. */ 115 #define SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */ 116 #define SF_QUIET 0x0008 /* chmod errors will be not reported */ 117 #define SF_SETUID 0x0010 /* Ignore Amiga uid */ 118 #define SF_SETGID 0x0020 /* Ignore Amiga gid */ 119 #define SF_SETMODE 0x0040 /* Ignore Amiga protection bits */ 120 #define SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */ 121 #define SF_OFS 0x0200 /* Old filesystem */ 122 #define SF_PREFIX 0x0400 /* Buffer for prefix is allocated */ 123 #define SF_VERBOSE 0x0800 /* Talk about fs when mounting */ 124 125 /* short cut to get to the affs specific sb data */ 126 static inline struct affs_sb_info *AFFS_SB(struct super_block *sb) 127 { 128 return sb->s_fs_info; 129 } 130 131 /* amigaffs.c */ 132 133 extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh); 134 extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh); 135 extern int affs_remove_header(struct dentry *dentry); 136 extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh); 137 extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh); 138 extern void secs_to_datestamp(time_t secs, struct affs_date *ds); 139 extern mode_t prot_to_mode(u32 prot); 140 extern void mode_to_prot(struct inode *inode); 141 extern void affs_error(struct super_block *sb, const char *function, const char *fmt, ...); 142 extern void affs_warning(struct super_block *sb, const char *function, const char *fmt, ...); 143 extern int affs_check_name(const unsigned char *name, int len); 144 extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry); 145 146 /* bitmap. c */ 147 148 extern u32 affs_count_free_blocks(struct super_block *s); 149 extern void affs_free_block(struct super_block *sb, u32 block); 150 extern u32 affs_alloc_block(struct inode *inode, u32 goal); 151 extern int affs_init_bitmap(struct super_block *sb, int *flags); 152 extern void affs_free_bitmap(struct super_block *sb); 153 154 /* namei.c */ 155 156 extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len); 157 extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *); 158 extern int affs_unlink(struct inode *dir, struct dentry *dentry); 159 extern int affs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *); 160 extern int affs_mkdir(struct inode *dir, struct dentry *dentry, int mode); 161 extern int affs_rmdir(struct inode *dir, struct dentry *dentry); 162 extern int affs_link(struct dentry *olddentry, struct inode *dir, 163 struct dentry *dentry); 164 extern int affs_symlink(struct inode *dir, struct dentry *dentry, 165 const char *symname); 166 extern int affs_rename(struct inode *old_dir, struct dentry *old_dentry, 167 struct inode *new_dir, struct dentry *new_dentry); 168 169 /* inode.c */ 170 171 extern unsigned long affs_parent_ino(struct inode *dir); 172 extern struct inode *affs_new_inode(struct inode *dir); 173 extern int affs_notify_change(struct dentry *dentry, struct iattr *attr); 174 extern void affs_evict_inode(struct inode *inode); 175 extern struct inode *affs_iget(struct super_block *sb, 176 unsigned long ino); 177 extern int affs_write_inode(struct inode *inode, 178 struct writeback_control *wbc); 179 extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type); 180 181 /* file.c */ 182 183 void affs_free_prealloc(struct inode *inode); 184 extern void affs_truncate(struct inode *); 185 int affs_file_fsync(struct file *, int); 186 187 /* dir.c */ 188 189 extern void affs_dir_truncate(struct inode *); 190 191 /* jump tables */ 192 193 extern const struct inode_operations affs_file_inode_operations; 194 extern const struct inode_operations affs_dir_inode_operations; 195 extern const struct inode_operations affs_symlink_inode_operations; 196 extern const struct file_operations affs_file_operations; 197 extern const struct file_operations affs_file_operations_ofs; 198 extern const struct file_operations affs_dir_operations; 199 extern const struct address_space_operations affs_symlink_aops; 200 extern const struct address_space_operations affs_aops; 201 extern const struct address_space_operations affs_aops_ofs; 202 203 extern const struct dentry_operations affs_dentry_operations; 204 205 static inline void 206 affs_set_blocksize(struct super_block *sb, int size) 207 { 208 sb_set_blocksize(sb, size); 209 } 210 static inline struct buffer_head * 211 affs_bread(struct super_block *sb, int block) 212 { 213 pr_debug("affs_bread: %d\n", block); 214 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) 215 return sb_bread(sb, block); 216 return NULL; 217 } 218 static inline struct buffer_head * 219 affs_getblk(struct super_block *sb, int block) 220 { 221 pr_debug("affs_getblk: %d\n", block); 222 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) 223 return sb_getblk(sb, block); 224 return NULL; 225 } 226 static inline struct buffer_head * 227 affs_getzeroblk(struct super_block *sb, int block) 228 { 229 struct buffer_head *bh; 230 pr_debug("affs_getzeroblk: %d\n", block); 231 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) { 232 bh = sb_getblk(sb, block); 233 lock_buffer(bh); 234 memset(bh->b_data, 0 , sb->s_blocksize); 235 set_buffer_uptodate(bh); 236 unlock_buffer(bh); 237 return bh; 238 } 239 return NULL; 240 } 241 static inline struct buffer_head * 242 affs_getemptyblk(struct super_block *sb, int block) 243 { 244 struct buffer_head *bh; 245 pr_debug("affs_getemptyblk: %d\n", block); 246 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) { 247 bh = sb_getblk(sb, block); 248 wait_on_buffer(bh); 249 set_buffer_uptodate(bh); 250 return bh; 251 } 252 return NULL; 253 } 254 static inline void 255 affs_brelse(struct buffer_head *bh) 256 { 257 if (bh) 258 pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr); 259 brelse(bh); 260 } 261 262 static inline void 263 affs_adjust_checksum(struct buffer_head *bh, u32 val) 264 { 265 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]); 266 ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val); 267 } 268 static inline void 269 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val) 270 { 271 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]); 272 ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val); 273 } 274 275 static inline void 276 affs_lock_link(struct inode *inode) 277 { 278 down(&AFFS_I(inode)->i_link_lock); 279 } 280 static inline void 281 affs_unlock_link(struct inode *inode) 282 { 283 up(&AFFS_I(inode)->i_link_lock); 284 } 285 static inline void 286 affs_lock_dir(struct inode *inode) 287 { 288 down(&AFFS_I(inode)->i_hash_lock); 289 } 290 static inline void 291 affs_unlock_dir(struct inode *inode) 292 { 293 up(&AFFS_I(inode)->i_hash_lock); 294 } 295 static inline void 296 affs_lock_ext(struct inode *inode) 297 { 298 down(&AFFS_I(inode)->i_ext_lock); 299 } 300 static inline void 301 affs_unlock_ext(struct inode *inode) 302 { 303 up(&AFFS_I(inode)->i_ext_lock); 304 } 305