include/xfs_fs.h

   1 /*
   2  * Copyright (c) 1995, 2001-2002 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2.1 of the GNU Lesser General Public License
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this program; if not, write the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307,
  22  * USA.
  23  *
  24  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  25  * Mountain View, CA  94043, or:
  26  *
  27  * http://www.sgi.com
  28  *
  29  * For further information regarding this notice, see:
  30  *
  31  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  32  */
  33 #ifndef _LINUX_XFS_FS_H
  34 #define _LINUX_XFS_FS_H
  35
  36 #include <linux/types.h>
  37 #include <asm/ioctl.h>
  38
  39
  40 /*
  41  * SGI's XFS filesystem's major stuff (constants, structures)
  42  */
  43
  44 #define XFS_SUPER_MAGIC 0x58465342
  45 #define XFS_NAME        "xfs"
  46
  47 /*
  48  * Direct I/O attribute record used with XFS_IOC_DIOINFO
  49  * d_miniosz is the min xfer size, xfer size multiple and file seek offset
  50  * alignment.
  51  */
  52 struct dioattr {
  53         __u32           d_mem;          /* data buffer memory alignment */
  54         __u32           d_miniosz;      /* min xfer size                */
  55         __u32           d_maxiosz;      /* max xfer size                */
  56 };
  57
  58 /*
  59  * Structure for XFS_IOC_FSGETXATTR[A] and XFS_IOC_FSSETXATTR.
  60  */
  61 struct fsxattr {
  62         __u32           fsx_xflags;     /* xflags field value (get/set) */
  63         __u32           fsx_extsize;    /* extsize field value (get/set)*/
  64         __u32           fsx_nextents;   /* nextents field value (get)   */
  65         unsigned char   fsx_pad[16];
  66 };
  67
  68 /*
  69  * Flags for the bs_xflags/fsx_xflags field
  70  * There should be a one-to-one correspondence between these flags and the
  71  * XFS_DIFLAG_s.
  72  */
  73 #define XFS_XFLAG_REALTIME      0x00000001
  74 #define XFS_XFLAG_PREALLOC      0x00000002
  75 #define XFS_XFLAG_HASATTR       0x80000000      /* no DIFLAG for this   */
  76 #define XFS_XFLAG_ALL           \
  77         ( XFS_XFLAG_REALTIME|XFS_XFLAG_PREALLOC|XFS_XFLAG_HASATTR )
  78
  79
  80 /*
  81  * Structure for XFS_IOC_GETBMAP.
  82  * On input, fill in bmv_offset and bmv_length of the first structure
  83  * to indicate the area of interest in the file, and bmv_entry with the
  84  * number of array elements given.  The first structure is updated on
  85  * return to give the offset and length for the next call.
  86  */
  87 struct getbmap {
  88         __s64           bmv_offset;     /* file offset of segment in blocks */
  89         __s64           bmv_block;      /* starting block (64-bit daddr_t)  */
  90         __s64           bmv_length;     /* length of segment, blocks        */
  91         __s32           bmv_count;      /* # of entries in array incl. 1st  */
  92         __s32           bmv_entries;    /* # of entries filled in (output)  */
  93 };
  94
  95 /*
  96  *      Structure for XFS_IOC_GETBMAPX.  Fields bmv_offset through bmv_entries
  97  *      are used exactly as in the getbmap structure.  The getbmapx structure
  98  *      has additional bmv_iflags and bmv_oflags fields. The bmv_iflags field
  99  *      is only used for the first structure.  It contains input flags
 100  *      specifying XFS_IOC_GETBMAPX actions.  The bmv_oflags field is filled
 101  *      in by the XFS_IOC_GETBMAPX command for each returned structure after
 102  *      the first.
 103  */
 104 struct getbmapx {
 105         __s64           bmv_offset;     /* file offset of segment in blocks */
 106         __s64           bmv_block;      /* starting block (64-bit daddr_t)  */
 107         __s64           bmv_length;     /* length of segment, blocks        */
 108         __s32           bmv_count;      /* # of entries in array incl. 1st  */
 109         __s32           bmv_entries;    /* # of entries filled in (output). */
 110         __s32           bmv_iflags;     /* input flags (1st structure)      */
 111         __s32           bmv_oflags;     /* output flags (after 1st structure)*/
 112         __s32           bmv_unused1;    /* future use                       */
 113         __s32           bmv_unused2;    /* future use                       */
 114 };
 115
 116 /*      bmv_iflags values - set by XFS_IOC_GETBMAPX caller.     */
 117 #define BMV_IF_ATTRFORK         0x1     /* return attr fork rather than data */
 118 #define BMV_IF_NO_DMAPI_READ    0x2     /* Do not generate DMAPI read event  */
 119 #define BMV_IF_PREALLOC         0x4     /* rtn status BMV_OF_PREALLOC if req */
 120 #define BMV_IF_VALID    (BMV_IF_ATTRFORK|BMV_IF_NO_DMAPI_READ|BMV_IF_PREALLOC)
 121 #ifdef __KERNEL__
 122 #define BMV_IF_EXTENDED 0x40000000      /* getpmapx if set */
 123 #endif
 124
 125 /*      bmv_oflags values - returned for for each non-header segment */
 126 #define BMV_OF_PREALLOC         0x1     /* segment = unwritten pre-allocation */
 127
 128 /*      Convert getbmap <-> getbmapx - move fields from p1 to p2. */
 129 #define GETBMAP_CONVERT(p1,p2) {        \
 130         p2.bmv_offset = p1.bmv_offset;  \
 131         p2.bmv_block = p1.bmv_block;    \
 132         p2.bmv_length = p1.bmv_length;  \
 133         p2.bmv_count = p1.bmv_count;    \
 134         p2.bmv_entries = p1.bmv_entries;  }
 135
 136
 137 /*
 138  * Structure for XFS_IOC_FSSETDM.
 139  * For use by backup and restore programs to set the XFS on-disk inode
 140  * fields di_dmevmask and di_dmstate.  These must be set to exactly and
 141  * only values previously obtained via xfs_bulkstat!  (Specifically the
 142  * xfs_bstat_t fields bs_dmevmask and bs_dmstate.)
 143  */
 144 struct fsdmidata {
 145         __u32           fsd_dmevmask;   /* corresponds to di_dmevmask */
 146         __u16           fsd_padding;
 147         __u16           fsd_dmstate;    /* corresponds to di_dmstate  */
 148 };
 149
 150 /*
 151  * File segment locking set data type for 64 bit access.
 152  * Also used for all the RESV/FREE interfaces.
 153  */
 154 typedef struct xfs_flock64 {
 155         __s16           l_type;
 156         __s16           l_whence;
 157         __s64           l_start;
 158         __s64           l_len;          /* len == 0 means until end of file */
 159         __s32           l_sysid;
 160         pid_t           l_pid;
 161         __s32           l_pad[4];       /* reserve area                     */
 162 } xfs_flock64_t;
 163
 164 /*
 165  * Output for XFS_IOC_FSGEOMETRY
 166  */
 167 typedef struct xfs_fsop_geom {
 168         __u32           blocksize;      /* filesystem (data) block size */
 169         __u32           rtextsize;      /* realtime extent size         */
 170         __u32           agblocks;       /* fsblocks in an AG            */
 171         __u32           agcount;        /* number of allocation groups  */
 172         __u32           logblocks;      /* fsblocks in the log          */
 173         __u32           sectsize;       /* (data) sector size, bytes    */
 174         __u32           inodesize;      /* inode size in bytes          */
 175         __u32           imaxpct;        /* max allowed inode space(%)   */
 176         __u64           datablocks;     /* fsblocks in data subvolume   */
 177         __u64           rtblocks;       /* fsblocks in realtime subvol  */
 178         __u64           rtextents;      /* rt extents in realtime subvol*/
 179         __u64           logstart;       /* starting fsblock of the log  */
 180         unsigned char   uuid[16];       /* unique id of the filesystem  */
 181         __u32           sunit;          /* stripe unit, fsblocks        */
 182         __u32           swidth;         /* stripe width, fsblocks       */
 183         __s32           version;        /* structure version            */
 184         __u32           flags;          /* superblock version flags     */
 185         __u32           logsectsize;    /* log sector size, bytes       */
 186         __u32           rtsectsize;     /* realtime sector size, bytes  */
 187         __u32           dirblocksize;   /* directory block size, bytes  */
 188 } xfs_fsop_geom_t;
 189
 190 /* Output for XFS_FS_COUNTS */
 191 typedef struct xfs_fsop_counts {
 192         __u64   freedata;       /* free data section blocks */
 193         __u64   freertx;        /* free rt extents */
 194         __u64   freeino;        /* free inodes */
 195         __u64   allocino;       /* total allocated inodes */
 196 } xfs_fsop_counts_t;
 197
 198 /* Input/Output for XFS_GET_RESBLKS and XFS_SET_RESBLKS */
 199 typedef struct xfs_fsop_resblks {
 200         __u64  resblks;
 201         __u64  resblks_avail;
 202 } xfs_fsop_resblks_t;
 203
 204 #define XFS_FSOP_GEOM_VERSION   0
 205
 206 #define XFS_FSOP_GEOM_FLAGS_ATTR        0x01    /* attributes in use    */
 207 #define XFS_FSOP_GEOM_FLAGS_NLINK       0x02    /* 32-bit nlink values  */
 208 #define XFS_FSOP_GEOM_FLAGS_QUOTA       0x04    /* quotas enabled       */
 209 #define XFS_FSOP_GEOM_FLAGS_IALIGN      0x08    /* inode alignment      */
 210 #define XFS_FSOP_GEOM_FLAGS_DALIGN      0x10    /* large data alignment */
 211 #define XFS_FSOP_GEOM_FLAGS_SHARED      0x20    /* read-only shared     */
 212 #define XFS_FSOP_GEOM_FLAGS_EXTFLG      0x40    /* special extent flag  */
 213 #define XFS_FSOP_GEOM_FLAGS_DIRV2       0x80    /* directory version 2  */
 214
 215
 216 /*
 217  * Minimum and maximum sizes need for growth checks
 218  */
 219 #define XFS_MIN_AG_BLOCKS       64
 220 #define XFS_MIN_LOG_BLOCKS      512
 221 #define XFS_MAX_LOG_BLOCKS      (64 * 1024)
 222 #define XFS_MIN_LOG_BYTES       (256 * 1024)
 223 #define XFS_MAX_LOG_BYTES       (128 * 1024 * 1024)
 224
 225 /*
 226  * Structures for XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG & XFS_IOC_FSGROWFSRT
 227  */
 228 typedef struct xfs_growfs_data {
 229         __u64           newblocks;      /* new data subvol size, fsblocks */
 230         __u32           imaxpct;        /* new inode space percentage limit */
 231 } xfs_growfs_data_t;
 232
 233 typedef struct xfs_growfs_log {
 234         __u32           newblocks;      /* new log size, fsblocks */
 235         __u32           isint;          /* 1 if new log is internal */
 236 } xfs_growfs_log_t;
 237
 238 typedef struct xfs_growfs_rt {
 239         __u64           newblocks;      /* new realtime size, fsblocks */
 240         __u32           extsize;        /* new realtime extent size, fsblocks */
 241 } xfs_growfs_rt_t;
 242
 243
 244 /*
 245  * Structures returned from ioctl XFS_IOC_FSBULKSTAT & XFS_IOC_FSBULKSTAT_SINGLE
 246  */
 247 typedef struct xfs_bstime {
 248         time_t          tv_sec;         /* seconds              */
 249         __s32           tv_nsec;        /* and nanoseconds      */
 250 } xfs_bstime_t;
 251
 252 typedef struct xfs_bstat {
 253         __u64           bs_ino;         /* inode number                 */
 254         __u16           bs_mode;        /* type and mode                */
 255         __u16           bs_nlink;       /* number of links              */
 256         __u32           bs_uid;         /* user id                      */
 257         __u32           bs_gid;         /* group id                     */
 258         __u32           bs_rdev;        /* device value                 */
 259         __s32           bs_blksize;     /* block size                   */
 260         __s64           bs_size;        /* file size                    */
 261         xfs_bstime_t    bs_atime;       /* access time                  */
 262         xfs_bstime_t    bs_mtime;       /* modify time                  */
 263         xfs_bstime_t    bs_ctime;       /* inode change time            */
 264         int64_t         bs_blocks;      /* number of blocks             */
 265         __u32           bs_xflags;      /* extended flags               */
 266         __s32           bs_extsize;     /* extent size                  */
 267         __s32           bs_extents;     /* number of extents            */
 268         __u32           bs_gen;         /* generation count             */
 269         __u16           bs_projid;      /* project id                   */
 270         unsigned char   bs_pad[14];     /* pad space, unused            */
 271         __u32           bs_dmevmask;    /* DMIG event mask              */
 272         __u16           bs_dmstate;     /* DMIG state info              */
 273         __u16           bs_aextents;    /* attribute number of extents  */
 274 } xfs_bstat_t;
 275
 276 /*
 277  * The user-level BulkStat Request interface structure.
 278  */
 279 typedef struct xfs_fsop_bulkreq {
 280         __u64           *lastip;        /* last inode # pointer         */
 281         __s32           icount;         /* count of entries in buffer   */
 282         void            *ubuffer;       /* user buffer for inode desc.  */
 283         __s32           *ocount;        /* output count pointer         */
 284 } xfs_fsop_bulkreq_t;
 285
 286
 287 /*
 288  * Structures returned from xfs_inumbers routine (XFS_IOC_FSINUMBERS).
 289  */
 290 typedef struct xfs_inogrp {
 291         __u64           xi_startino;    /* starting inode number        */
 292         __s32           xi_alloccount;  /* # bits set in allocmask      */
 293         __u64           xi_allocmask;   /* mask of allocated inodes     */
 294 } xfs_inogrp_t;
 295
 296
 297 /*
 298  * Error injection.
 299  */
 300 typedef struct xfs_error_injection {
 301         __s32           fd;
 302         __s32           errtag;
 303 } xfs_error_injection_t;
 304
 305
 306 /*
 307  * The user-level Handle Request interface structure.
 308  */
 309 typedef struct xfs_fsop_handlereq {
 310         __u32           fd;             /* fd for FD_TO_HANDLE          */
 311         void            *path;          /* user pathname                */
 312         __u32           oflags;         /* open flags                   */
 313         void            *ihandle;       /* user supplied handle         */
 314         __u32           ihandlen;       /* user supplied length         */
 315         void            *ohandle;       /* user buffer for handle       */
 316         __u32           *ohandlen;      /* user buffer length           */
 317 } xfs_fsop_handlereq_t;
 318
 319 /*
 320  * Compound structures for passing args through Handle Request interfaces
 321  * xfs_fssetdm_by_handle, xfs_attrlist_by_handle, xfs_attrmulti_by_handle
 322  * - ioctls: XFS_IOC_FSSETDM_BY_HANDLE, XFS_IOC_ATTRLIST_BY_HANDLE, and
 323  *           XFS_IOC_ATTRMULTI_BY_HANDLE
 324  */
 325
 326 typedef struct xfs_fsop_setdm_handlereq {
 327         struct xfs_fsop_handlereq hreq; /* handle interface structure */
 328         struct fsdmidata *data;         /* DMAPI data to set          */
 329 } xfs_fsop_setdm_handlereq_t;
 330
 331 typedef struct xfs_attrlist_cursor {
 332         __u32   opaque[4];
 333 } xfs_attrlist_cursor_t;
 334
 335 typedef struct xfs_fsop_attrlist_handlereq {
 336         struct xfs_fsop_handlereq hreq; /* handle interface structure */
 337         struct xfs_attrlist_cursor pos; /* opaque cookie, list offset */
 338         __u32 flags;                    /* flags, use ROOT/USER names */
 339         __u32 buflen;                   /* length of buffer supplied  */
 340         void *buffer;                   /* attrlist data to return    */
 341 } xfs_fsop_attrlist_handlereq_t;
 342
 343 typedef struct xfs_attr_multiop {
 344         __u32   am_opcode;
 345         __s32   am_error;
 346         void    *am_attrname;
 347         void    *am_attrvalue;
 348         __u32   am_length;
 349         __u32   am_flags;
 350 } xfs_attr_multiop_t;
 351
 352 typedef struct xfs_fsop_attrmulti_handlereq {
 353         struct xfs_fsop_handlereq hreq; /* handle interface structure */
 354         __u32 opcount;                  /* count of following multiop */
 355         struct xfs_attr_multiop *ops;   /* attr_multi data to get/set */
 356 } xfs_fsop_attrmulti_handlereq_t;
 357
 358 /*
 359  * File system identifier. Should be unique (at least per machine).
 360  */
 361 typedef struct {
 362         __u32 val[2];                   /* file system id type */
 363 } xfs_fsid_t;
 364
 365 /*
 366  * File identifier.  Should be unique per filesystem on a single machine.
 367  * This is typically called by a stateless file server in order to generate
 368  * "file handles".
 369  */
 370 #define MAXFIDSZ        46
 371 typedef struct fid {
 372         __u16           fid_len;                /* length of data in bytes */
 373         unsigned char   fid_data[MAXFIDSZ];     /* data (variable length)  */
 374 } fid_t;
 375
 376 typedef struct xfs_fid {
 377         __u16   xfs_fid_len;            /* length of remainder  */
 378         __u16   xfs_fid_pad;
 379         __u32   xfs_fid_gen;            /* generation number    */
 380         __u64   xfs_fid_ino;            /* 64 bits inode number */
 381 } xfs_fid_t;
 382
 383 typedef struct xfs_fid2 {
 384         __u16   fid_len;        /* length of remainder */
 385         __u16   fid_pad;        /* padding, must be zero */
 386         __u32   fid_gen;        /* generation number */
 387         __u64   fid_ino;        /* inode number */
 388 } xfs_fid2_t;
 389
 390 typedef struct xfs_handle {
 391         union {
 392                 __s64       align;      /* force alignment of ha_fid     */
 393                 xfs_fsid_t  _ha_fsid;   /* unique file system identifier */
 394         } ha_u;
 395         xfs_fid_t       ha_fid;         /* file system specific file ID  */
 396 } xfs_handle_t;
 397 #define ha_fsid ha_u._ha_fsid
 398
 399 #define XFS_HSIZE(handle)       (((char *) &(handle).ha_fid.xfs_fid_pad  \
 400                                  - (char *) &(handle))                    \
 401                                  + (handle).ha_fid.xfs_fid_len)
 402
 403 #define XFS_HANDLE_CMP(h1, h2)  bcmp(h1, h2, sizeof (xfs_handle_t))
 404
 405 #define FSHSIZE         sizeof (fsid_t)
 406
 407
 408 /*
 409  * ioctl commands that replace IRIX fcntl()'s
 410  * For 'documentation' purposed more than anything else,
 411  * the "cmd #" field reflects the IRIX fcntl number.
 412  */
 413 #define XFS_IOC_ALLOCSP         _IOW ('X', 10, struct xfs_flock64)
 414 #define XFS_IOC_FREESP          _IOW ('X', 11, struct xfs_flock64)
 415 #define XFS_IOC_DIOINFO         _IOR ('X', 30, struct dioattr)
 416 #define XFS_IOC_FSGETXATTR      _IOR ('X', 31, struct fsxattr)
 417 #define XFS_IOC_FSSETXATTR      _IOW ('X', 32, struct fsxattr)
 418 #define XFS_IOC_ALLOCSP64       _IOW ('X', 36, struct xfs_flock64)
 419 #define XFS_IOC_FREESP64        _IOW ('X', 37, struct xfs_flock64)
 420 #define XFS_IOC_GETBMAP         _IOWR('X', 38, struct getbmap)
 421 #define XFS_IOC_FSSETDM         _IOW ('X', 39, struct fsdmidata)
 422 #define XFS_IOC_RESVSP          _IOW ('X', 40, struct xfs_flock64)
 423 #define XFS_IOC_UNRESVSP        _IOW ('X', 41, struct xfs_flock64)
 424 #define XFS_IOC_RESVSP64        _IOW ('X', 42, struct xfs_flock64)
 425 #define XFS_IOC_UNRESVSP64      _IOW ('X', 43, struct xfs_flock64)
 426 #define XFS_IOC_GETBMAPA        _IOWR('X', 44, struct getbmap)
 427 #define XFS_IOC_FSGETXATTRA     _IOR ('X', 45, struct fsxattr)
 428 /*      XFS_IOC_SETBIOSIZE ---- deprecated 46      */
 429 /*      XFS_IOC_GETBIOSIZE ---- deprecated 47      */
 430 #define XFS_IOC_GETBMAPX        _IOWR('X', 56, struct getbmap)
 431
 432 /*
 433  * ioctl commands that replace IRIX syssgi()'s
 434  */
 435 #define XFS_IOC_FSGEOMETRY           _IOR ('X', 100, struct xfs_fsop_geom)
 436 #define XFS_IOC_FSBULKSTAT           _IOWR('X', 101, struct xfs_fsop_bulkreq)
 437 #define XFS_IOC_FSBULKSTAT_SINGLE    _IOWR('X', 102, struct xfs_fsop_bulkreq)
 438 #define XFS_IOC_FSINUMBERS           _IOWR('X', 103, struct xfs_fsop_bulkreq)
 439 #define XFS_IOC_PATH_TO_FSHANDLE     _IOWR('X', 104, struct xfs_fsop_handlereq)
 440 #define XFS_IOC_PATH_TO_HANDLE       _IOWR('X', 105, struct xfs_fsop_handlereq)
 441 #define XFS_IOC_FD_TO_HANDLE         _IOWR('X', 106, struct xfs_fsop_handlereq)
 442 #define XFS_IOC_OPEN_BY_HANDLE       _IOWR('X', 107, struct xfs_fsop_handlereq)
 443 #define XFS_IOC_READLINK_BY_HANDLE   _IOWR('X', 108, struct xfs_fsop_handlereq)
 444 #define XFS_IOC_SWAPEXT              _IOWR('X', 109, struct xfs_swapext)
 445 #define XFS_IOC_FSGROWFSDATA         _IOW ('X', 110, struct xfs_growfs_data)
 446 #define XFS_IOC_FSGROWFSLOG          _IOW ('X', 111, struct xfs_growfs_log)
 447 #define XFS_IOC_FSGROWFSRT           _IOW ('X', 112, struct xfs_growfs_rt)
 448 #define XFS_IOC_FSCOUNTS             _IOR ('X', 113, struct xfs_fsop_counts)
 449 #define XFS_IOC_SET_RESBLKS          _IOR ('X', 114, struct xfs_fsop_resblks)
 450 #define XFS_IOC_GET_RESBLKS          _IOR ('X', 115, struct xfs_fsop_resblks)
 451 #define XFS_IOC_ERROR_INJECTION      _IOW ('X', 116, struct xfs_error_injection)
 452 #define XFS_IOC_ERROR_CLEARALL       _IOW ('X', 117, struct xfs_error_injection)
 453 /*      XFS_IOC_ATTRCTL_BY_HANDLE -- deprecated 118      */
 454 #define XFS_IOC_FREEZE               _IOWR('X', 119, int)
 455 #define XFS_IOC_THAW                 _IOWR('X', 120, int)
 456 #define XFS_IOC_FSSETDM_BY_HANDLE    _IOW ('X', 121, struct xfs_fsop_setdm_handlereq)
 457 #define XFS_IOC_ATTRLIST_BY_HANDLE   _IOW ('X', 122, struct xfs_fsop_attrlist_handlereq)
 458 #define XFS_IOC_ATTRMULTI_BY_HANDLE  _IOW ('X', 123, struct xfs_fsop_attrmulti_handlereq)
 459 /*      XFS_IOC_GETFSUUID ---------- deprecated 140      */
 460
 461
 462 /*
 463  * Block I/O parameterization.  A basic block (BB) is the lowest size of
 464  * filesystem allocation, and must equal 512.  Length units given to bio
 465  * routines are in BB's.
 466  */
 467 #define BBSHIFT         9
 468 #define BBSIZE          (1<<BBSHIFT)
 469 #define BBMASK          (BBSIZE-1)
 470 #define BTOBB(bytes)    (((__u64)(bytes) + BBSIZE - 1) >> BBSHIFT)
 471 #define BTOBBT(bytes)   ((__u64)(bytes) >> BBSHIFT)
 472 #define BBTOB(bbs)      ((bbs) << BBSHIFT)
 473 #define OFFTOBB(bytes)  (((__u64)(bytes) + BBSIZE - 1) >> BBSHIFT)
 474 #define OFFTOBBT(bytes) ((__u64)(bytes) >> BBSHIFT)
 475 #define BBTOOFF(bbs)    ((__u64)(bbs) << BBSHIFT)
 476
 477 #define SEEKLIMIT32     0x7fffffff
 478 #define BBSEEKLIMIT32   BTOBBT(SEEKLIMIT32)
 479 #define SEEKLIMIT       0x7fffffffffffffffLL
 480 #define BBSEEKLIMIT     OFFTOBBT(SEEKLIMIT)
 481
 482 #endif  /* _LINUX_XFS_FS_H */