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 #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_MAX_PREALLOC 32 31 #define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2) 32 #define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2) 33 #define AFFS_AC_MASK (AFFS_AC_SIZE-1) 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 list_entry(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 uid_t s_uid; /* uid to override */ 91 gid_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 }; 104 105 #define SF_INTL 0x0001 /* International filesystem. */ 106 #define SF_BM_VALID 0x0002 /* Bitmap is valid. */ 107 #define SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */ 108 #define SF_QUIET 0x0008 /* chmod errors will be not reported */ 109 #define SF_SETUID 0x0010 /* Ignore Amiga uid */ 110 #define SF_SETGID 0x0020 /* Ignore Amiga gid */ 111 #define SF_SETMODE 0x0040 /* Ignore Amiga protection bits */ 112 #define SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */ 113 #define SF_OFS 0x0200 /* Old filesystem */ 114 #define SF_PREFIX 0x0400 /* Buffer for prefix is allocated */ 115 #define SF_VERBOSE 0x0800 /* Talk about fs when mounting */ 116 117 /* short cut to get to the affs specific sb data */ 118 static inline struct affs_sb_info *AFFS_SB(struct super_block *sb) 119 { 120 return sb->s_fs_info; 121 } 122 123 /* amigaffs.c */ 124 125 extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh); 126 extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh); 127 extern int affs_remove_header(struct dentry *dentry); 128 extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh); 129 extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh); 130 extern void secs_to_datestamp(time_t secs, struct affs_date *ds); 131 extern umode_t prot_to_mode(u32 prot); 132 extern void mode_to_prot(struct inode *inode); 133 extern void affs_error(struct super_block *sb, const char *function, const char *fmt, ...); 134 extern void affs_warning(struct super_block *sb, const char *function, const char *fmt, ...); 135 extern int affs_check_name(const unsigned char *name, int len); 136 extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry); 137 138 /* bitmap. c */ 139 140 extern u32 affs_count_free_blocks(struct super_block *s); 141 extern void affs_free_block(struct super_block *sb, u32 block); 142 extern u32 affs_alloc_block(struct inode *inode, u32 goal); 143 extern int affs_init_bitmap(struct super_block *sb, int *flags); 144 extern void affs_free_bitmap(struct super_block *sb); 145 146 /* namei.c */ 147 148 extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len); 149 extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *); 150 extern int affs_unlink(struct inode *dir, struct dentry *dentry); 151 extern int affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, struct nameidata *); 152 extern int affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); 153 extern int affs_rmdir(struct inode *dir, struct dentry *dentry); 154 extern int affs_link(struct dentry *olddentry, struct inode *dir, 155 struct dentry *dentry); 156 extern int affs_symlink(struct inode *dir, struct dentry *dentry, 157 const char *symname); 158 extern int affs_rename(struct inode *old_dir, struct dentry *old_dentry, 159 struct inode *new_dir, struct dentry *new_dentry); 160 161 /* inode.c */ 162 163 extern unsigned long affs_parent_ino(struct inode *dir); 164 extern struct inode *affs_new_inode(struct inode *dir); 165 extern int affs_notify_change(struct dentry *dentry, struct iattr *attr); 166 extern void affs_evict_inode(struct inode *inode); 167 extern struct inode *affs_iget(struct super_block *sb, 168 unsigned long ino); 169 extern int affs_write_inode(struct inode *inode, 170 struct writeback_control *wbc); 171 extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type); 172 173 /* file.c */ 174 175 void affs_free_prealloc(struct inode *inode); 176 extern void affs_truncate(struct inode *); 177 int affs_file_fsync(struct file *, loff_t, loff_t, int); 178 179 /* dir.c */ 180 181 extern void affs_dir_truncate(struct inode *); 182 183 /* jump tables */ 184 185 extern const struct inode_operations affs_file_inode_operations; 186 extern const struct inode_operations affs_dir_inode_operations; 187 extern const struct inode_operations affs_symlink_inode_operations; 188 extern const struct file_operations affs_file_operations; 189 extern const struct file_operations affs_file_operations_ofs; 190 extern const struct file_operations affs_dir_operations; 191 extern const struct address_space_operations affs_symlink_aops; 192 extern const struct address_space_operations affs_aops; 193 extern const struct address_space_operations affs_aops_ofs; 194 195 extern const struct dentry_operations affs_dentry_operations; 196 extern const struct dentry_operations affs_intl_dentry_operations; 197 198 static inline void 199 affs_set_blocksize(struct super_block *sb, int size) 200 { 201 sb_set_blocksize(sb, size); 202 } 203 static inline struct buffer_head * 204 affs_bread(struct super_block *sb, int block) 205 { 206 pr_debug("affs_bread: %d\n", block); 207 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) 208 return sb_bread(sb, block); 209 return NULL; 210 } 211 static inline struct buffer_head * 212 affs_getblk(struct super_block *sb, int block) 213 { 214 pr_debug("affs_getblk: %d\n", block); 215 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) 216 return sb_getblk(sb, block); 217 return NULL; 218 } 219 static inline struct buffer_head * 220 affs_getzeroblk(struct super_block *sb, int block) 221 { 222 struct buffer_head *bh; 223 pr_debug("affs_getzeroblk: %d\n", block); 224 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) { 225 bh = sb_getblk(sb, block); 226 lock_buffer(bh); 227 memset(bh->b_data, 0 , sb->s_blocksize); 228 set_buffer_uptodate(bh); 229 unlock_buffer(bh); 230 return bh; 231 } 232 return NULL; 233 } 234 static inline struct buffer_head * 235 affs_getemptyblk(struct super_block *sb, int block) 236 { 237 struct buffer_head *bh; 238 pr_debug("affs_getemptyblk: %d\n", block); 239 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) { 240 bh = sb_getblk(sb, block); 241 wait_on_buffer(bh); 242 set_buffer_uptodate(bh); 243 return bh; 244 } 245 return NULL; 246 } 247 static inline void 248 affs_brelse(struct buffer_head *bh) 249 { 250 if (bh) 251 pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr); 252 brelse(bh); 253 } 254 255 static inline void 256 affs_adjust_checksum(struct buffer_head *bh, u32 val) 257 { 258 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]); 259 ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val); 260 } 261 static inline void 262 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val) 263 { 264 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]); 265 ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val); 266 } 267 268 static inline void 269 affs_lock_link(struct inode *inode) 270 { 271 down(&AFFS_I(inode)->i_link_lock); 272 } 273 static inline void 274 affs_unlock_link(struct inode *inode) 275 { 276 up(&AFFS_I(inode)->i_link_lock); 277 } 278 static inline void 279 affs_lock_dir(struct inode *inode) 280 { 281 down(&AFFS_I(inode)->i_hash_lock); 282 } 283 static inline void 284 affs_unlock_dir(struct inode *inode) 285 { 286 up(&AFFS_I(inode)->i_hash_lock); 287 } 288 static inline void 289 affs_lock_ext(struct inode *inode) 290 { 291 down(&AFFS_I(inode)->i_ext_lock); 292 } 293 static inline void 294 affs_unlock_ext(struct inode *inode) 295 { 296 up(&AFFS_I(inode)->i_ext_lock); 297 } 298