tools/brcm/K24/hndtools-mipsel-uclibc-4.1.2/include/linux/sysv_fs.h

   1 #ifndef _LINUX_SYSV_FS_H
   2 #define _LINUX_SYSV_FS_H
   3
   4 /*
   5  * The SystemV/Coherent filesystem constants/structures/macros
   6  */
   7
   8
   9 /* This code assumes
  10    - sizeof(short) = 2, sizeof(int) = 4, sizeof(long) = 4,
  11    - alignof(short) = 2, alignof(long) = 4.
  12 */
  13
  14 #ifdef __GNUC__
  15 #define __packed2__  __attribute__ ((packed, aligned(2)))
  16 #else
  17 #error I want gcc!
  18 #endif
  19
  20 #include <linux/stat.h>         /* declares S_IFLNK etc. */
  21 #include <linux/sched.h>        /* declares wake_up() */
  22 #include <linux/sysv_fs_sb.h>   /* defines the sv_... shortcuts */
  23
  24
  25 /* Layout on disk */
  26 /* ============== */
  27
  28 static inline u32 PDP_swab(u32 x)
  29 {
  30 #ifdef __LITTLE_ENDIAN
  31         return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16);
  32 #else
  33 #ifdef __BIG_ENDIAN
  34         return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8);
  35 #else
  36 #error BYTESEX
  37 #endif
  38 #endif
  39 }
  40
  41 /* inode numbers are 16 bit */
  42
  43 typedef u16 sysv_ino_t;
  44
  45 /* Block numbers are 24 bit, sometimes stored in 32 bit.
  46    On Coherent FS, they are always stored in PDP-11 manner: the least
  47    significant 16 bits come last.
  48 */
  49
  50 typedef u32 sysv_zone_t;
  51
  52 /* Among the blocks ... */
  53 /* Xenix FS, Coherent FS: block 0 is the boot block, block 1 the super-block.
  54    SystemV FS: block 0 contains both the boot sector and the super-block. */
  55 /* The first inode zone is sb->sv_firstinodezone (1 or 2). */
  56
  57 /* Among the inodes ... */
  58 /* 0 is non-existent */
  59 #define SYSV_BADBL_INO  1       /* inode of bad blocks file */
  60 #define SYSV_ROOT_INO   2       /* inode of root directory */
  61
  62
  63 /* Xenix super-block data on disk */
  64 #define XENIX_NICINOD   100     /* number of inode cache entries */
  65 #define XENIX_NICFREE   100     /* number of free block list chunk entries */
  66 struct xenix_super_block {
  67         u16             s_isize; /* index of first data zone */
  68         u32             s_fsize __packed2__; /* total number of zones of this fs */
  69         /* the start of the free block list: */
  70         u16             s_nfree;        /* number of free blocks in s_free, <= XENIX_NICFREE */
  71         u32             s_free[XENIX_NICFREE]; /* first free block list chunk */
  72         /* the cache of free inodes: */
  73         u16             s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */
  74         sysv_ino_t      s_inode[XENIX_NICINOD]; /* some free inodes */
  75         /* locks, not used by Linux: */
  76         char            s_flock;        /* lock during free block list manipulation */
  77         char            s_ilock;        /* lock during inode cache manipulation */
  78         char            s_fmod;         /* super-block modified flag */
  79         char            s_ronly;        /* flag whether fs is mounted read-only */
  80         u32             s_time __packed2__; /* time of last super block update */
  81         u32             s_tfree __packed2__; /* total number of free zones */
  82         u16             s_tinode;       /* total number of free inodes */
  83         s16             s_dinfo[4];     /* device information ?? */
  84         char            s_fname[6];     /* file system volume name */
  85         char            s_fpack[6];     /* file system pack name */
  86         char            s_clean;        /* set to 0x46 when filesystem is properly unmounted */
  87         char            s_fill[371];
  88         s32             s_magic;        /* version of file system */
  89         s32             s_type;         /* type of file system: 1 for 512 byte blocks
  90                                                                 2 for 1024 byte blocks
  91                                                                 3 for 2048 byte blocks */
  92
  93 };
  94
  95 /* SystemV FS comes in two variants:
  96  * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2).
  97  * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4).
  98  */
  99 #define SYSV_NICINOD    100     /* number of inode cache entries */
 100 #define SYSV_NICFREE    50      /* number of free block list chunk entries */
 101
 102 /* SystemV4 super-block data on disk */
 103 struct sysv4_super_block {
 104         u16     s_isize;        /* index of first data zone */
 105         u16     s_pad0;
 106         u32     s_fsize;        /* total number of zones of this fs */
 107         /* the start of the free block list: */
 108         u16     s_nfree;        /* number of free blocks in s_free, <= SYSV_NICFREE */
 109         u16     s_pad1;
 110         u32     s_free[SYSV_NICFREE]; /* first free block list chunk */
 111         /* the cache of free inodes: */
 112         u16     s_ninode;       /* number of free inodes in s_inode, <= SYSV_NICINOD */
 113         u16     s_pad2;
 114         sysv_ino_t     s_inode[SYSV_NICINOD]; /* some free inodes */
 115         /* locks, not used by Linux: */
 116         char    s_flock;        /* lock during free block list manipulation */
 117         char    s_ilock;        /* lock during inode cache manipulation */
 118         char    s_fmod;         /* super-block modified flag */
 119         char    s_ronly;        /* flag whether fs is mounted read-only */
 120         u32     s_time;         /* time of last super block update */
 121         s16     s_dinfo[4];     /* device information ?? */
 122         u32     s_tfree;        /* total number of free zones */
 123         u16     s_tinode;       /* total number of free inodes */
 124         u16     s_pad3;
 125         char    s_fname[6];     /* file system volume name */
 126         char    s_fpack[6];     /* file system pack name */
 127         s32     s_fill[12];
 128         s32     s_state;        /* file system state: 0x7c269d38-s_time means clean */
 129         s32     s_magic;        /* version of file system */
 130         s32     s_type;         /* type of file system: 1 for 512 byte blocks
 131                                                                 2 for 1024 byte blocks */
 132 };
 133
 134 /* SystemV2 super-block data on disk */
 135 struct sysv2_super_block {
 136         u16     s_isize;                /* index of first data zone */
 137         u32     s_fsize __packed2__;    /* total number of zones of this fs */
 138         /* the start of the free block list: */
 139         u16     s_nfree;                /* number of free blocks in s_free, <= SYSV_NICFREE */
 140         u32     s_free[SYSV_NICFREE];   /* first free block list chunk */
 141         /* the cache of free inodes: */
 142         u16     s_ninode;               /* number of free inodes in s_inode, <= SYSV_NICINOD */
 143         sysv_ino_t     s_inode[SYSV_NICINOD]; /* some free inodes */
 144         /* locks, not used by Linux: */
 145         char    s_flock;                /* lock during free block list manipulation */
 146         char    s_ilock;                /* lock during inode cache manipulation */
 147         char    s_fmod;                 /* super-block modified flag */
 148         char    s_ronly;                /* flag whether fs is mounted read-only */
 149         u32     s_time __packed2__;     /* time of last super block update */
 150         s16     s_dinfo[4];             /* device information ?? */
 151         u32     s_tfree __packed2__;    /* total number of free zones */
 152         u16     s_tinode;               /* total number of free inodes */
 153         char    s_fname[6];             /* file system volume name */
 154         char    s_fpack[6];             /* file system pack name */
 155         s32     s_fill[14];
 156         s32     s_state;                /* file system state: 0xcb096f43 means clean */
 157         s32     s_magic;                /* version of file system */
 158         s32     s_type;                 /* type of file system: 1 for 512 byte blocks
 159                                                                 2 for 1024 byte blocks */
 160 };
 161
 162 /* V7 super-block data on disk */
 163 #define V7_NICINOD     100     /* number of inode cache entries */
 164 #define V7_NICFREE     50      /* number of free block list chunk entries */
 165 struct v7_super_block {
 166         u16    s_isize;        /* index of first data zone */
 167         u32    s_fsize __packed2__; /* total number of zones of this fs */
 168         /* the start of the free block list: */
 169         u16    s_nfree;        /* number of free blocks in s_free, <= V7_NICFREE */
 170         u32    s_free[V7_NICFREE]; /* first free block list chunk */
 171         /* the cache of free inodes: */
 172         u16    s_ninode;       /* number of free inodes in s_inode, <= V7_NICINOD */
 173         sysv_ino_t      s_inode[V7_NICINOD]; /* some free inodes */
 174         /* locks, not used by Linux or V7: */
 175         char    s_flock;        /* lock during free block list manipulation */
 176         char    s_ilock;        /* lock during inode cache manipulation */
 177         char    s_fmod;         /* super-block modified flag */
 178         char    s_ronly;        /* flag whether fs is mounted read-only */
 179         u32     s_time __packed2__; /* time of last super block update */
 180         /* the following fields are not maintained by V7: */
 181         u32     s_tfree __packed2__; /* total number of free zones */
 182         u16     s_tinode;       /* total number of free inodes */
 183         u16     s_m;            /* interleave factor */
 184         u16     s_n;            /* interleave factor */
 185         char    s_fname[6];     /* file system name */
 186         char    s_fpack[6];     /* file system pack name */
 187 };
 188
 189 /* Coherent super-block data on disk */
 190 #define COH_NICINOD     100     /* number of inode cache entries */
 191 #define COH_NICFREE     64      /* number of free block list chunk entries */
 192 struct coh_super_block {
 193         u16             s_isize;        /* index of first data zone */
 194         u32             s_fsize __packed2__; /* total number of zones of this fs */
 195         /* the start of the free block list: */
 196         u16 s_nfree;    /* number of free blocks in s_free, <= COH_NICFREE */
 197         u32             s_free[COH_NICFREE] __packed2__; /* first free block list chunk */
 198         /* the cache of free inodes: */
 199         u16             s_ninode;       /* number of free inodes in s_inode, <= COH_NICINOD */
 200         sysv_ino_t      s_inode[COH_NICINOD]; /* some free inodes */
 201         /* locks, not used by Linux: */
 202         char            s_flock;        /* lock during free block list manipulation */
 203         char            s_ilock;        /* lock during inode cache manipulation */
 204         char            s_fmod;         /* super-block modified flag */
 205         char            s_ronly;        /* flag whether fs is mounted read-only */
 206         u32             s_time __packed2__; /* time of last super block update */
 207         u32             s_tfree __packed2__; /* total number of free zones */
 208         u16             s_tinode;       /* total number of free inodes */
 209         u16             s_interleave_m; /* interleave factor */
 210         u16             s_interleave_n;
 211         char            s_fname[6];     /* file system volume name */
 212         char            s_fpack[6];     /* file system pack name */
 213         u32             s_unique;       /* zero, not used */
 214 };
 215
 216 /* SystemV/Coherent inode data on disk */
 217
 218 struct sysv_inode {
 219         u16 i_mode;
 220         u16 i_nlink;
 221         u16 i_uid;
 222         u16 i_gid;
 223         u32 i_size;
 224         union { /* directories, regular files, ... */
 225                 unsigned char i_addb[3*(10+1+1+1)+1]; /* zone numbers: max. 10 data blocks,
 226                                               * then 1 indirection block,
 227                                               * then 1 double indirection block,
 228                                               * then 1 triple indirection block.
 229                                               * Then maybe a "file generation number" ??
 230                                               */
 231                 /* named pipes on Coherent */
 232                 struct {
 233                         char p_addp[30];
 234                         s16 p_pnc;
 235                         s16 p_prx;
 236                         s16 p_pwx;
 237                 } i_p;
 238         } i_a;
 239         u32 i_atime;    /* time of last access */
 240         u32 i_mtime;    /* time of last modification */
 241         u32 i_ctime;    /* time of creation */
 242 };
 243
 244 /* Admissible values for i_nlink: 0.._LINK_MAX */
 245 enum {
 246         XENIX_LINK_MAX  =       126,    /* ?? */
 247         SYSV_LINK_MAX   =       126,    /* 127? 251? */
 248         V7_LINK_MAX     =       126,    /* ?? */
 249         COH_LINK_MAX    =       10000,
 250 };
 251
 252 /* The number of inodes per block is
 253    sb->sv_inodes_per_block = block_size / sizeof(struct sysv_inode) */
 254 /* The number of indirect pointers per block is
 255    sb->sv_ind_per_block = block_size / sizeof(u32) */
 256
 257
 258 /* SystemV/Coherent directory entry on disk */
 259
 260 #define SYSV_NAMELEN    14      /* max size of name in struct sysv_dir_entry */
 261
 262 struct sysv_dir_entry {
 263         sysv_ino_t inode;
 264         char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */
 265 };
 266
 267 #define SYSV_DIRSIZE    sizeof(struct sysv_dir_entry)   /* size of every directory entry */
 268
 269
 270 /* Operations */
 271 /* ========== */
 272
 273 /* identify the FS in memory */
 274 enum {
 275         FSTYPE_NONE = 0,
 276         FSTYPE_XENIX,
 277         FSTYPE_SYSV4,
 278         FSTYPE_SYSV2,
 279         FSTYPE_COH,
 280         FSTYPE_V7,
 281         FSTYPE_AFS,
 282         FSTYPE_END,
 283 };
 284
 285 #define SYSV_MAGIC_BASE         0x012FF7B3
 286
 287 #define XENIX_SUPER_MAGIC       (SYSV_MAGIC_BASE+FSTYPE_XENIX)
 288 #define SYSV4_SUPER_MAGIC       (SYSV_MAGIC_BASE+FSTYPE_SYSV4)
 289 #define SYSV2_SUPER_MAGIC       (SYSV_MAGIC_BASE+FSTYPE_SYSV2)
 290 #define COH_SUPER_MAGIC         (SYSV_MAGIC_BASE+FSTYPE_COH)
 291
 292 #ifdef __KERNEL__
 293
 294 enum {
 295         BYTESEX_LE,
 296         BYTESEX_PDP,
 297         BYTESEX_BE,
 298 };
 299
 300 /*
 301  * Function prototypes
 302  */
 303
 304 extern struct inode * sysv_new_inode(const struct inode *, mode_t);
 305 extern void sysv_free_inode(struct inode *);
 306 extern unsigned long sysv_count_free_inodes(struct super_block *);
 307 extern u32 sysv_new_block(struct super_block *);
 308 extern void sysv_free_block(struct super_block *, u32);
 309 extern unsigned long sysv_count_free_blocks(struct super_block *);
 310
 311 extern void sysv_truncate(struct inode *);
 312
 313 extern void sysv_write_inode(struct inode *, int);
 314 extern int sysv_sync_inode(struct inode *);
 315 extern int sysv_sync_file(struct file *, struct dentry *, int);
 316 extern void sysv_set_inode(struct inode *, dev_t);
 317
 318 extern struct sysv_dir_entry *sysv_find_entry(struct dentry*, struct page**);
 319 extern int sysv_add_link(struct dentry*, struct inode*);
 320 extern int sysv_delete_entry(struct sysv_dir_entry*, struct page*);
 321 extern int sysv_make_empty(struct inode*, struct inode*);
 322 extern int sysv_empty_dir(struct inode*);
 323 extern void sysv_set_link(struct sysv_dir_entry*, struct page*, struct inode*);
 324 extern struct sysv_dir_entry *sysv_dotdot(struct inode*, struct page**);
 325 extern ino_t sysv_inode_by_name(struct dentry*);
 326
 327 extern struct inode_operations sysv_file_inode_operations;
 328 extern struct inode_operations sysv_dir_inode_operations;
 329 extern struct inode_operations sysv_fast_symlink_inode_operations;
 330 extern struct file_operations sysv_file_operations;
 331 extern struct file_operations sysv_dir_operations;
 332 extern struct address_space_operations sysv_aops;
 333 extern struct super_operations sysv_sops;
 334 extern struct dentry_operations sysv_dentry_operations;
 335
 336 extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned, struct buffer_head **);
 337
 338 static inline void dirty_sb(struct super_block *sb)
 339 {
 340         mark_buffer_dirty(sb->sv_bh1);
 341         if (sb->sv_bh1 != sb->sv_bh2)
 342                 mark_buffer_dirty(sb->sv_bh2);
 343         sb->s_dirt = 1;
 344 }
 345
 346 static inline u32 fs32_to_cpu(struct super_block *sb, u32 n)
 347 {
 348         if (sb->sv_bytesex == BYTESEX_PDP)
 349                 return PDP_swab(n);
 350         else if (sb->sv_bytesex == BYTESEX_LE)
 351                 return le32_to_cpu(n);
 352         else
 353                 return be32_to_cpu(n);
 354 }
 355
 356 static inline u32 cpu_to_fs32(struct super_block *sb, u32 n)
 357 {
 358         if (sb->sv_bytesex == BYTESEX_PDP)
 359                 return PDP_swab(n);
 360         else if (sb->sv_bytesex == BYTESEX_LE)
 361                 return cpu_to_le32(n);
 362         else
 363                 return cpu_to_be32(n);
 364 }
 365
 366 static inline u32 fs32_add(struct super_block *sb, u32 *n, int d)
 367 {
 368         if (sb->sv_bytesex == BYTESEX_PDP)
 369                 return *n = PDP_swab(PDP_swab(*n)+d);
 370         else if (sb->sv_bytesex == BYTESEX_LE)
 371                 return *n = cpu_to_le32(le32_to_cpu(*n)+d);
 372         else
 373                 return *n = cpu_to_be32(be32_to_cpu(*n)+d);
 374 }
 375
 376 static inline u16 fs16_to_cpu(struct super_block *sb, u16 n)
 377 {
 378         if (sb->sv_bytesex != BYTESEX_BE)
 379                 return le16_to_cpu(n);
 380         else
 381                 return be16_to_cpu(n);
 382 }
 383
 384 static inline u16 cpu_to_fs16(struct super_block *sb, u16 n)
 385 {
 386         if (sb->sv_bytesex != BYTESEX_BE)
 387                 return cpu_to_le16(n);
 388         else
 389                 return cpu_to_be16(n);
 390 }
 391
 392 static inline u16 fs16_add(struct super_block *sb, u16 *n, int d)
 393 {
 394         if (sb->sv_bytesex != BYTESEX_BE)
 395                 return *n = cpu_to_le16(le16_to_cpu(*n)+d);
 396         else
 397                 return *n = cpu_to_be16(be16_to_cpu(*n)+d);
 398 }
 399
 400 #endif /* __KERNEL__ */
 401
 402 #endif