Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #include <linux/types.h> |
| 2 | #include <linux/fs.h> |
| 3 | #include <linux/buffer_head.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | #include <linux/amigaffs.h> |
Matthias Kaehlcke | 7d135a5 | 2008-07-25 19:44:51 -0700 | [diff] [blame] | 5 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 { |
Roman Zippel | dca3c33 | 2008-04-29 17:02:20 +0200 | [diff] [blame] | 52 | atomic_t i_opencnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. */ |
Matthias Kaehlcke | 7d135a5 | 2008-07-25 19:44:51 -0700 | [diff] [blame] | 102 | struct mutex s_bmlock; /* Protects bitmap access. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | char s_volume[32]; /* Volume prefix for absolute symlinks. */ |
Al Viro | 2933392 | 2010-01-24 00:04:07 -0500 | [diff] [blame] | 110 | spinlock_t symlink_lock; /* protects the previous two */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | extern void affs_delete_inode(struct inode *inode); |
| 175 | extern void affs_clear_inode(struct inode *inode); |
David Howells | 210f855 | 2008-02-07 00:15:29 -0800 | [diff] [blame] | 176 | extern struct inode *affs_iget(struct super_block *sb, |
| 177 | unsigned long ino); |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 178 | extern int affs_write_inode(struct inode *inode, |
| 179 | struct writeback_control *wbc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type); |
| 181 | |
| 182 | /* file.c */ |
| 183 | |
| 184 | void affs_free_prealloc(struct inode *inode); |
| 185 | extern void affs_truncate(struct inode *); |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame^] | 186 | int affs_file_fsync(struct file *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
| 188 | /* dir.c */ |
| 189 | |
| 190 | extern void affs_dir_truncate(struct inode *); |
| 191 | |
| 192 | /* jump tables */ |
| 193 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 194 | extern const struct inode_operations affs_file_inode_operations; |
| 195 | extern const struct inode_operations affs_dir_inode_operations; |
| 196 | extern const struct inode_operations affs_symlink_inode_operations; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 197 | extern const struct file_operations affs_file_operations; |
| 198 | extern const struct file_operations affs_file_operations_ofs; |
| 199 | extern const struct file_operations affs_dir_operations; |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 200 | extern const struct address_space_operations affs_symlink_aops; |
| 201 | extern const struct address_space_operations affs_aops; |
| 202 | extern const struct address_space_operations affs_aops_ofs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
Al Viro | e16404e | 2009-02-20 05:55:13 +0000 | [diff] [blame] | 204 | extern const struct dentry_operations affs_dentry_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
| 206 | static inline void |
| 207 | affs_set_blocksize(struct super_block *sb, int size) |
| 208 | { |
| 209 | sb_set_blocksize(sb, size); |
| 210 | } |
| 211 | static inline struct buffer_head * |
| 212 | affs_bread(struct super_block *sb, int block) |
| 213 | { |
| 214 | pr_debug("affs_bread: %d\n", block); |
| 215 | if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) |
| 216 | return sb_bread(sb, block); |
| 217 | return NULL; |
| 218 | } |
| 219 | static inline struct buffer_head * |
| 220 | affs_getblk(struct super_block *sb, int block) |
| 221 | { |
| 222 | pr_debug("affs_getblk: %d\n", block); |
| 223 | if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) |
| 224 | return sb_getblk(sb, block); |
| 225 | return NULL; |
| 226 | } |
| 227 | static inline struct buffer_head * |
| 228 | affs_getzeroblk(struct super_block *sb, int block) |
| 229 | { |
| 230 | struct buffer_head *bh; |
| 231 | pr_debug("affs_getzeroblk: %d\n", block); |
| 232 | if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) { |
| 233 | bh = sb_getblk(sb, block); |
| 234 | lock_buffer(bh); |
| 235 | memset(bh->b_data, 0 , sb->s_blocksize); |
| 236 | set_buffer_uptodate(bh); |
| 237 | unlock_buffer(bh); |
| 238 | return bh; |
| 239 | } |
| 240 | return NULL; |
| 241 | } |
| 242 | static inline struct buffer_head * |
| 243 | affs_getemptyblk(struct super_block *sb, int block) |
| 244 | { |
| 245 | struct buffer_head *bh; |
| 246 | pr_debug("affs_getemptyblk: %d\n", block); |
| 247 | if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) { |
| 248 | bh = sb_getblk(sb, block); |
| 249 | wait_on_buffer(bh); |
| 250 | set_buffer_uptodate(bh); |
| 251 | return bh; |
| 252 | } |
| 253 | return NULL; |
| 254 | } |
| 255 | static inline void |
| 256 | affs_brelse(struct buffer_head *bh) |
| 257 | { |
| 258 | if (bh) |
| 259 | pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr); |
| 260 | brelse(bh); |
| 261 | } |
| 262 | |
| 263 | static inline void |
| 264 | affs_adjust_checksum(struct buffer_head *bh, u32 val) |
| 265 | { |
| 266 | u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]); |
| 267 | ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val); |
| 268 | } |
| 269 | static inline void |
| 270 | affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val) |
| 271 | { |
| 272 | u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]); |
| 273 | ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val); |
| 274 | } |
| 275 | |
| 276 | static inline void |
| 277 | affs_lock_link(struct inode *inode) |
| 278 | { |
| 279 | down(&AFFS_I(inode)->i_link_lock); |
| 280 | } |
| 281 | static inline void |
| 282 | affs_unlock_link(struct inode *inode) |
| 283 | { |
| 284 | up(&AFFS_I(inode)->i_link_lock); |
| 285 | } |
| 286 | static inline void |
| 287 | affs_lock_dir(struct inode *inode) |
| 288 | { |
| 289 | down(&AFFS_I(inode)->i_hash_lock); |
| 290 | } |
| 291 | static inline void |
| 292 | affs_unlock_dir(struct inode *inode) |
| 293 | { |
| 294 | up(&AFFS_I(inode)->i_hash_lock); |
| 295 | } |
| 296 | static inline void |
| 297 | affs_lock_ext(struct inode *inode) |
| 298 | { |
| 299 | down(&AFFS_I(inode)->i_ext_lock); |
| 300 | } |
| 301 | static inline void |
| 302 | affs_unlock_ext(struct inode *inode) |
| 303 | { |
| 304 | up(&AFFS_I(inode)->i_ext_lock); |
| 305 | } |