include/linux/amigaffs.h

   1 #ifndef AMIGAFFS_H
   2 #define AMIGAFFS_H
   3
   4 #include <linux/types.h>
   5 #include <linux/buffer_head.h>
   6 #include <linux/string.h>
   7 #include <asm/byteorder.h>
   8
   9 /* AmigaOS allows file names with up to 30 characters length.
  10  * Names longer than that will be silently truncated. If you
  11  * want to disallow this, comment out the following #define.
  12  * Creating filesystem objects with longer names will then
  13  * result in an error (ENAMETOOLONG).
  14  */
  15 /*#define AFFS_NO_TRUNCATE */
  16
  17 /* Ugly macros make the code more pretty. */
  18
  19 #define GET_END_PTR(st,p,sz)             ((st *)((char *)(p)+((sz)-sizeof(st))))
  20 #define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
  21 #define AFFS_BLOCK(sb, bh, blk)         (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
  22
  23 static inline void
  24 affs_set_blocksize(struct super_block *sb, int size)
  25 {
  26         sb_set_blocksize(sb, size);
  27 }
  28 static inline struct buffer_head *
  29 affs_bread(struct super_block *sb, int block)
  30 {
  31         pr_debug("affs_bread: %d\n", block);
  32         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
  33                 return sb_bread(sb, block);
  34         return NULL;
  35 }
  36 static inline struct buffer_head *
  37 affs_getblk(struct super_block *sb, int block)
  38 {
  39         pr_debug("affs_getblk: %d\n", block);
  40         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
  41                 return sb_getblk(sb, block);
  42         return NULL;
  43 }
  44 static inline struct buffer_head *
  45 affs_getzeroblk(struct super_block *sb, int block)
  46 {
  47         struct buffer_head *bh;
  48         pr_debug("affs_getzeroblk: %d\n", block);
  49         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
  50                 bh = sb_getblk(sb, block);
  51                 lock_buffer(bh);
  52                 memset(bh->b_data, 0 , sb->s_blocksize);
  53                 set_buffer_uptodate(bh);
  54                 unlock_buffer(bh);
  55                 return bh;
  56         }
  57         return NULL;
  58 }
  59 static inline struct buffer_head *
  60 affs_getemptyblk(struct super_block *sb, int block)
  61 {
  62         struct buffer_head *bh;
  63         pr_debug("affs_getemptyblk: %d\n", block);
  64         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
  65                 bh = sb_getblk(sb, block);
  66                 wait_on_buffer(bh);
  67                 set_buffer_uptodate(bh);
  68                 return bh;
  69         }
  70         return NULL;
  71 }
  72 static inline void
  73 affs_brelse(struct buffer_head *bh)
  74 {
  75         if (bh)
  76                 pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr);
  77         brelse(bh);
  78 }
  79
  80 static inline void
  81 affs_adjust_checksum(struct buffer_head *bh, u32 val)
  82 {
  83         u32 tmp = be32_to_cpu(((u32 *)bh->b_data)[5]);
  84         ((u32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
  85 }
  86 static inline void
  87 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
  88 {
  89         u32 tmp = be32_to_cpu(((u32 *)bh->b_data)[0]);
  90         ((u32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
  91 }
  92
  93 static inline void
  94 affs_lock_link(struct inode *inode)
  95 {
  96         down(&AFFS_I(inode)->i_link_lock);
  97 }
  98 static inline void
  99 affs_unlock_link(struct inode *inode)
 100 {
 101         up(&AFFS_I(inode)->i_link_lock);
 102 }
 103 static inline void
 104 affs_lock_dir(struct inode *inode)
 105 {
 106         down(&AFFS_I(inode)->i_hash_lock);
 107 }
 108 static inline void
 109 affs_unlock_dir(struct inode *inode)
 110 {
 111         up(&AFFS_I(inode)->i_hash_lock);
 112 }
 113 static inline void
 114 affs_lock_ext(struct inode *inode)
 115 {
 116         down(&AFFS_I(inode)->i_ext_lock);
 117 }
 118 static inline void
 119 affs_unlock_ext(struct inode *inode)
 120 {
 121         up(&AFFS_I(inode)->i_ext_lock);
 122 }
 123
 124 #ifdef __LITTLE_ENDIAN
 125 #define BO_EXBITS       0x18UL
 126 #elif defined(__BIG_ENDIAN)
 127 #define BO_EXBITS       0x00UL
 128 #else
 129 #error Endianness must be known for affs to work.
 130 #endif
 131
 132 #define FS_OFS          0x444F5300
 133 #define FS_FFS          0x444F5301
 134 #define FS_INTLOFS      0x444F5302
 135 #define FS_INTLFFS      0x444F5303
 136 #define FS_DCOFS        0x444F5304
 137 #define FS_DCFFS        0x444F5305
 138 #define MUFS_FS         0x6d754653   /* 'muFS' */
 139 #define MUFS_OFS        0x6d754600   /* 'muF\0' */
 140 #define MUFS_FFS        0x6d754601   /* 'muF\1' */
 141 #define MUFS_INTLOFS    0x6d754602   /* 'muF\2' */
 142 #define MUFS_INTLFFS    0x6d754603   /* 'muF\3' */
 143 #define MUFS_DCOFS      0x6d754604   /* 'muF\4' */
 144 #define MUFS_DCFFS      0x6d754605   /* 'muF\5' */
 145
 146 #define T_SHORT         2
 147 #define T_LIST          16
 148 #define T_DATA          8
 149
 150 #define ST_LINKFILE     -4
 151 #define ST_FILE         -3
 152 #define ST_ROOT         1
 153 #define ST_USERDIR      2
 154 #define ST_SOFTLINK     3
 155 #define ST_LINKDIR      4
 156
 157 #define AFFS_ROOT_BMAPS         25
 158
 159 #define AFFS_HEAD(bh)           ((struct affs_head *)(bh)->b_data)
 160 #define AFFS_TAIL(sb, bh)       ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
 161 #define AFFS_ROOT_HEAD(bh)      ((struct affs_root_head *)(bh)->b_data)
 162 #define AFFS_ROOT_TAIL(sb, bh)  ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
 163 #define AFFS_DATA_HEAD(bh)      ((struct affs_data_head *)(bh)->b_data)
 164 #define AFFS_DATA(bh)           (((struct affs_data_head *)(bh)->b_data)->data)
 165
 166 struct affs_date {
 167         u32 days;
 168         u32 mins;
 169         u32 ticks;
 170 };
 171
 172 struct affs_short_date {
 173         u16 days;
 174         u16 mins;
 175         u16 ticks;
 176 };
 177
 178 struct affs_root_head {
 179         u32 ptype;
 180         u32 spare1;
 181         u32 spare2;
 182         u32 hash_size;
 183         u32 spare3;
 184         u32 checksum;
 185         u32 hashtable[1];
 186 };
 187
 188 struct affs_root_tail {
 189         u32 bm_flag;
 190         u32 bm_blk[AFFS_ROOT_BMAPS];
 191         u32 bm_ext;
 192         struct affs_date root_change;
 193         u8 disk_name[32];
 194         u32 spare1;
 195         u32 spare2;
 196         struct affs_date disk_change;
 197         struct affs_date disk_create;
 198         u32 spare3;
 199         u32 spare4;
 200         u32 dcache;
 201         u32 stype;
 202 };
 203
 204 struct affs_head {
 205         u32 ptype;
 206         u32 key;
 207         u32 block_count;
 208         u32 spare1;
 209         u32 first_data;
 210         u32 checksum;
 211         u32 table[1];
 212 };
 213
 214 struct affs_tail {
 215         u32 spare1;
 216         u16 uid;
 217         u16 gid;
 218         u32 protect;
 219         u32 size;
 220         u8 comment[92];
 221         struct affs_date change;
 222         u8 name[32];
 223         u32 spare2;
 224         u32 original;
 225         u32 link_chain;
 226         u32 spare[5];
 227         u32 hash_chain;
 228         u32 parent;
 229         u32 extension;
 230         u32 stype;
 231 };
 232
 233 struct slink_front
 234 {
 235         u32 ptype;
 236         u32 key;
 237         u32 spare1[3];
 238         u32 checksum;
 239         u8 symname[1];  /* depends on block size */
 240 };
 241
 242 struct affs_data_head
 243 {
 244         u32 ptype;
 245         u32 key;
 246         u32 sequence;
 247         u32 size;
 248         u32 next;
 249         u32 checksum;
 250         u8 data[1];     /* depends on block size */
 251 };
 252
 253 /* Permission bits */
 254
 255 #define FIBF_OTR_READ           0x8000
 256 #define FIBF_OTR_WRITE          0x4000
 257 #define FIBF_OTR_EXECUTE        0x2000
 258 #define FIBF_OTR_DELETE         0x1000
 259 #define FIBF_GRP_READ           0x0800
 260 #define FIBF_GRP_WRITE          0x0400
 261 #define FIBF_GRP_EXECUTE        0x0200
 262 #define FIBF_GRP_DELETE         0x0100
 263
 264 #define FIBF_HIDDEN             0x0080
 265 #define FIBF_SCRIPT             0x0040
 266 #define FIBF_PURE               0x0020          /* no use under linux */
 267 #define FIBF_ARCHIVED           0x0010          /* never set, always cleared on write */
 268 #define FIBF_NOREAD             0x0008          /* 0 means allowed */
 269 #define FIBF_NOWRITE            0x0004          /* 0 means allowed */
 270 #define FIBF_NOEXECUTE          0x0002          /* 0 means allowed, ignored under linux */
 271 #define FIBF_NODELETE           0x0001          /* 0 means allowed */
 272
 273 #define FIBF_OWNER              0x000F          /* Bits pertaining to owner */
 274 #define FIBF_MASK               0xEE0E          /* Bits modified by Linux */
 275
 276 #endif