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 #include <linux/workqueue.h> 7 8 /* AmigaOS allows file names with up to 30 characters length. 9 * Names longer than that will be silently truncated. If you 10 * want to disallow this, comment out the following #define. 11 * Creating filesystem objects with longer names will then 12 * result in an error (ENAMETOOLONG). 13 */ 14 /*#define AFFS_NO_TRUNCATE */ 15 16 /* Ugly macros make the code more pretty. */ 17 18 #define GET_END_PTR(st,p,sz) ((st *)((char *)(p)+((sz)-sizeof(st)))) 19 #define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey]) 20 #define AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)]) 21 22 #define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data) 23 #define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail))) 24 #define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data) 25 #define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail))) 26 #define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data) 27 #define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data) 28 29 #define AFFS_CACHE_SIZE PAGE_SIZE 30 31 #define AFFS_MAX_PREALLOC 32 32 #define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2) 33 #define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2) 34 #define AFFS_AC_MASK (AFFS_AC_SIZE-1) 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 list_entry(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 SF_INTL 0x0001 /* International filesystem. */ 111 #define SF_BM_VALID 0x0002 /* Bitmap is valid. */ 112 #define SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */ 113 #define SF_QUIET 0x0008 /* chmod errors will be not reported */ 114 #define SF_SETUID 0x0010 /* Ignore Amiga uid */ 115 #define SF_SETGID 0x0020 /* Ignore Amiga gid */ 116 #define SF_SETMODE 0x0040 /* Ignore Amiga protection bits */ 117 #define SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */ 118 #define SF_OFS 0x0200 /* Old filesystem */ 119 #define SF_PREFIX 0x0400 /* Buffer for prefix is allocated */ 120 #define SF_VERBOSE 0x0800 /* Talk about fs when mounting */ 121 122 /* short cut to get to the affs specific sb data */ 123 static inline struct affs_sb_info *AFFS_SB(struct super_block *sb) 124 { 125 return sb->s_fs_info; 126 } 127 128 void affs_mark_sb_dirty(struct super_block *sb); 129 130 /* amigaffs.c */ 131 132 extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh); 133 extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh); 134 extern int affs_remove_header(struct dentry *dentry); 135 extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh); 136 extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh); 137 extern void secs_to_datestamp(time_t secs, struct affs_date *ds); 138 extern umode_t prot_to_mode(u32 prot); 139 extern void mode_to_prot(struct inode *inode); 140 extern void affs_error(struct super_block *sb, const char *function, const char *fmt, ...); 141 extern void affs_warning(struct super_block *sb, const char *function, const char *fmt, ...); 142 extern int affs_check_name(const unsigned char *name, int len); 143 extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry); 144 145 /* bitmap. c */ 146 147 extern u32 affs_count_free_blocks(struct super_block *s); 148 extern void affs_free_block(struct super_block *sb, u32 block); 149 extern u32 affs_alloc_block(struct inode *inode, u32 goal); 150 extern int affs_init_bitmap(struct super_block *sb, int *flags); 151 extern void affs_free_bitmap(struct super_block *sb); 152 153 /* namei.c */ 154 155 extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len); 156 extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int); 157 extern int affs_unlink(struct inode *dir, struct dentry *dentry); 158 extern int affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool); 159 extern int affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); 160 extern int affs_rmdir(struct inode *dir, struct dentry *dentry); 161 extern int affs_link(struct dentry *olddentry, struct inode *dir, 162 struct dentry *dentry); 163 extern int affs_symlink(struct inode *dir, struct dentry *dentry, 164 const char *symname); 165 extern int affs_rename(struct inode *old_dir, struct dentry *old_dentry, 166 struct inode *new_dir, struct dentry *new_dentry); 167 168 /* inode.c */ 169 170 extern unsigned long affs_parent_ino(struct inode *dir); 171 extern struct inode *affs_new_inode(struct inode *dir); 172 extern int affs_notify_change(struct dentry *dentry, struct iattr *attr); 173 extern void affs_evict_inode(struct inode *inode); 174 extern struct inode *affs_iget(struct super_block *sb, 175 unsigned long ino); 176 extern int affs_write_inode(struct inode *inode, 177 struct writeback_control *wbc); 178 extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type); 179 180 /* file.c */ 181 182 void affs_free_prealloc(struct inode *inode); 183 extern void affs_truncate(struct inode *); 184 int affs_file_fsync(struct file *, loff_t, loff_t, int); 185 186 /* dir.c */ 187 188 extern void affs_dir_truncate(struct inode *); 189 190 /* jump tables */ 191 192 extern const struct inode_operations affs_file_inode_operations; 193 extern const struct inode_operations affs_dir_inode_operations; 194 extern const struct inode_operations affs_symlink_inode_operations; 195 extern const struct file_operations affs_file_operations; 196 extern const struct file_operations affs_file_operations_ofs; 197 extern const struct file_operations affs_dir_operations; 198 extern const struct address_space_operations affs_symlink_aops; 199 extern const struct address_space_operations affs_aops; 200 extern const struct address_space_operations affs_aops_ofs; 201 202 extern const struct dentry_operations affs_dentry_operations; 203 extern const struct dentry_operations affs_intl_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