linux/fs/xfs/xfs_sb.h
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   1/*
   2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3 * All Rights Reserved.
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it would be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write the Free Software Foundation,
  16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18#ifndef __XFS_SB_H__
  19#define __XFS_SB_H__
  20
  21/*
  22 * Super block
  23 * Fits into a sector-sized buffer at address 0 of each allocation group.
  24 * Only the first of these is ever updated except during growfs.
  25 */
  26
  27struct xfs_buf;
  28struct xfs_mount;
  29
  30#define XFS_SB_MAGIC            0x58465342      /* 'XFSB' */
  31#define XFS_SB_VERSION_1        1               /* 5.3, 6.0.1, 6.1 */
  32#define XFS_SB_VERSION_2        2               /* 6.2 - attributes */
  33#define XFS_SB_VERSION_3        3               /* 6.2 - new inode version */
  34#define XFS_SB_VERSION_4        4               /* 6.2+ - bitmask version */
  35#define XFS_SB_VERSION_5        5               /* CRC enabled filesystem */
  36#define XFS_SB_VERSION_NUMBITS          0x000f
  37#define XFS_SB_VERSION_ALLFBITS         0xfff0
  38#define XFS_SB_VERSION_SASHFBITS        0xf000
  39#define XFS_SB_VERSION_REALFBITS        0x0ff0
  40#define XFS_SB_VERSION_ATTRBIT          0x0010
  41#define XFS_SB_VERSION_NLINKBIT         0x0020
  42#define XFS_SB_VERSION_QUOTABIT         0x0040
  43#define XFS_SB_VERSION_ALIGNBIT         0x0080
  44#define XFS_SB_VERSION_DALIGNBIT        0x0100
  45#define XFS_SB_VERSION_SHAREDBIT        0x0200
  46#define XFS_SB_VERSION_LOGV2BIT         0x0400
  47#define XFS_SB_VERSION_SECTORBIT        0x0800
  48#define XFS_SB_VERSION_EXTFLGBIT        0x1000
  49#define XFS_SB_VERSION_DIRV2BIT         0x2000
  50#define XFS_SB_VERSION_BORGBIT          0x4000  /* ASCII only case-insens. */
  51#define XFS_SB_VERSION_MOREBITSBIT      0x8000
  52#define XFS_SB_VERSION_OKSASHFBITS      \
  53        (XFS_SB_VERSION_EXTFLGBIT | \
  54         XFS_SB_VERSION_DIRV2BIT | \
  55         XFS_SB_VERSION_BORGBIT)
  56#define XFS_SB_VERSION_OKREALFBITS      \
  57        (XFS_SB_VERSION_ATTRBIT | \
  58         XFS_SB_VERSION_NLINKBIT | \
  59         XFS_SB_VERSION_QUOTABIT | \
  60         XFS_SB_VERSION_ALIGNBIT | \
  61         XFS_SB_VERSION_DALIGNBIT | \
  62         XFS_SB_VERSION_SHAREDBIT | \
  63         XFS_SB_VERSION_LOGV2BIT | \
  64         XFS_SB_VERSION_SECTORBIT | \
  65         XFS_SB_VERSION_MOREBITSBIT)
  66#define XFS_SB_VERSION_OKREALBITS       \
  67        (XFS_SB_VERSION_NUMBITS | \
  68         XFS_SB_VERSION_OKREALFBITS | \
  69         XFS_SB_VERSION_OKSASHFBITS)
  70
  71/*
  72 * There are two words to hold XFS "feature" bits: the original
  73 * word, sb_versionnum, and sb_features2.  Whenever a bit is set in
  74 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
  75 *
  76 * These defines represent bits in sb_features2.
  77 */
  78#define XFS_SB_VERSION2_REALFBITS       0x00ffffff      /* Mask: features */
  79#define XFS_SB_VERSION2_RESERVED1BIT    0x00000001
  80#define XFS_SB_VERSION2_LAZYSBCOUNTBIT  0x00000002      /* Superblk counters */
  81#define XFS_SB_VERSION2_RESERVED4BIT    0x00000004
  82#define XFS_SB_VERSION2_ATTR2BIT        0x00000008      /* Inline attr rework */
  83#define XFS_SB_VERSION2_PARENTBIT       0x00000010      /* parent pointers */
  84#define XFS_SB_VERSION2_PROJID32BIT     0x00000080      /* 32 bit project id */
  85#define XFS_SB_VERSION2_CRCBIT          0x00000100      /* metadata CRCs */
  86
  87#define XFS_SB_VERSION2_OKREALFBITS     \
  88        (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
  89         XFS_SB_VERSION2_ATTR2BIT       | \
  90         XFS_SB_VERSION2_PROJID32BIT)
  91#define XFS_SB_VERSION2_OKSASHFBITS     \
  92        (0)
  93#define XFS_SB_VERSION2_OKREALBITS      \
  94        (XFS_SB_VERSION2_OKREALFBITS |  \
  95         XFS_SB_VERSION2_OKSASHFBITS )
  96
  97/*
  98 * Superblock - in core version.  Must match the ondisk version below.
  99 * Must be padded to 64 bit alignment.
 100 */
 101typedef struct xfs_sb {
 102        __uint32_t      sb_magicnum;    /* magic number == XFS_SB_MAGIC */
 103        __uint32_t      sb_blocksize;   /* logical block size, bytes */
 104        xfs_drfsbno_t   sb_dblocks;     /* number of data blocks */
 105        xfs_drfsbno_t   sb_rblocks;     /* number of realtime blocks */
 106        xfs_drtbno_t    sb_rextents;    /* number of realtime extents */
 107        uuid_t          sb_uuid;        /* file system unique id */
 108        xfs_dfsbno_t    sb_logstart;    /* starting block of log if internal */
 109        xfs_ino_t       sb_rootino;     /* root inode number */
 110        xfs_ino_t       sb_rbmino;      /* bitmap inode for realtime extents */
 111        xfs_ino_t       sb_rsumino;     /* summary inode for rt bitmap */
 112        xfs_agblock_t   sb_rextsize;    /* realtime extent size, blocks */
 113        xfs_agblock_t   sb_agblocks;    /* size of an allocation group */
 114        xfs_agnumber_t  sb_agcount;     /* number of allocation groups */
 115        xfs_extlen_t    sb_rbmblocks;   /* number of rt bitmap blocks */
 116        xfs_extlen_t    sb_logblocks;   /* number of log blocks */
 117        __uint16_t      sb_versionnum;  /* header version == XFS_SB_VERSION */
 118        __uint16_t      sb_sectsize;    /* volume sector size, bytes */
 119        __uint16_t      sb_inodesize;   /* inode size, bytes */
 120        __uint16_t      sb_inopblock;   /* inodes per block */
 121        char            sb_fname[12];   /* file system name */
 122        __uint8_t       sb_blocklog;    /* log2 of sb_blocksize */
 123        __uint8_t       sb_sectlog;     /* log2 of sb_sectsize */
 124        __uint8_t       sb_inodelog;    /* log2 of sb_inodesize */
 125        __uint8_t       sb_inopblog;    /* log2 of sb_inopblock */
 126        __uint8_t       sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
 127        __uint8_t       sb_rextslog;    /* log2 of sb_rextents */
 128        __uint8_t       sb_inprogress;  /* mkfs is in progress, don't mount */
 129        __uint8_t       sb_imax_pct;    /* max % of fs for inode space */
 130                                        /* statistics */
 131        /*
 132         * These fields must remain contiguous.  If you really
 133         * want to change their layout, make sure you fix the
 134         * code in xfs_trans_apply_sb_deltas().
 135         */
 136        __uint64_t      sb_icount;      /* allocated inodes */
 137        __uint64_t      sb_ifree;       /* free inodes */
 138        __uint64_t      sb_fdblocks;    /* free data blocks */
 139        __uint64_t      sb_frextents;   /* free realtime extents */
 140        /*
 141         * End contiguous fields.
 142         */
 143        xfs_ino_t       sb_uquotino;    /* user quota inode */
 144        xfs_ino_t       sb_gquotino;    /* group quota inode */
 145        __uint16_t      sb_qflags;      /* quota flags */
 146        __uint8_t       sb_flags;       /* misc. flags */
 147        __uint8_t       sb_shared_vn;   /* shared version number */
 148        xfs_extlen_t    sb_inoalignmt;  /* inode chunk alignment, fsblocks */
 149        __uint32_t      sb_unit;        /* stripe or raid unit */
 150        __uint32_t      sb_width;       /* stripe or raid width */
 151        __uint8_t       sb_dirblklog;   /* log2 of dir block size (fsbs) */
 152        __uint8_t       sb_logsectlog;  /* log2 of the log sector size */
 153        __uint16_t      sb_logsectsize; /* sector size for the log, bytes */
 154        __uint32_t      sb_logsunit;    /* stripe unit size for the log */
 155        __uint32_t      sb_features2;   /* additional feature bits */
 156
 157        /*
 158         * bad features2 field as a result of failing to pad the sb
 159         * structure to 64 bits. Some machines will be using this field
 160         * for features2 bits. Easiest just to mark it bad and not use
 161         * it for anything else.
 162         */
 163        __uint32_t      sb_bad_features2;
 164
 165        /* version 5 superblock fields start here */
 166
 167        /* feature masks */
 168        __uint32_t      sb_features_compat;
 169        __uint32_t      sb_features_ro_compat;
 170        __uint32_t      sb_features_incompat;
 171        __uint32_t      sb_features_log_incompat;
 172
 173        __uint32_t      sb_crc;         /* superblock crc */
 174        __uint32_t      sb_pad;
 175
 176        xfs_ino_t       sb_pquotino;    /* project quota inode */
 177        xfs_lsn_t       sb_lsn;         /* last write sequence */
 178
 179        /* must be padded to 64 bit alignment */
 180} xfs_sb_t;
 181
 182/*
 183 * Superblock - on disk version.  Must match the in core version above.
 184 * Must be padded to 64 bit alignment.
 185 */
 186typedef struct xfs_dsb {
 187        __be32          sb_magicnum;    /* magic number == XFS_SB_MAGIC */
 188        __be32          sb_blocksize;   /* logical block size, bytes */
 189        __be64          sb_dblocks;     /* number of data blocks */
 190        __be64          sb_rblocks;     /* number of realtime blocks */
 191        __be64          sb_rextents;    /* number of realtime extents */
 192        uuid_t          sb_uuid;        /* file system unique id */
 193        __be64          sb_logstart;    /* starting block of log if internal */
 194        __be64          sb_rootino;     /* root inode number */
 195        __be64          sb_rbmino;      /* bitmap inode for realtime extents */
 196        __be64          sb_rsumino;     /* summary inode for rt bitmap */
 197        __be32          sb_rextsize;    /* realtime extent size, blocks */
 198        __be32          sb_agblocks;    /* size of an allocation group */
 199        __be32          sb_agcount;     /* number of allocation groups */
 200        __be32          sb_rbmblocks;   /* number of rt bitmap blocks */
 201        __be32          sb_logblocks;   /* number of log blocks */
 202        __be16          sb_versionnum;  /* header version == XFS_SB_VERSION */
 203        __be16          sb_sectsize;    /* volume sector size, bytes */
 204        __be16          sb_inodesize;   /* inode size, bytes */
 205        __be16          sb_inopblock;   /* inodes per block */
 206        char            sb_fname[12];   /* file system name */
 207        __u8            sb_blocklog;    /* log2 of sb_blocksize */
 208        __u8            sb_sectlog;     /* log2 of sb_sectsize */
 209        __u8            sb_inodelog;    /* log2 of sb_inodesize */
 210        __u8            sb_inopblog;    /* log2 of sb_inopblock */
 211        __u8            sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
 212        __u8            sb_rextslog;    /* log2 of sb_rextents */
 213        __u8            sb_inprogress;  /* mkfs is in progress, don't mount */
 214        __u8            sb_imax_pct;    /* max % of fs for inode space */
 215                                        /* statistics */
 216        /*
 217         * These fields must remain contiguous.  If you really
 218         * want to change their layout, make sure you fix the
 219         * code in xfs_trans_apply_sb_deltas().
 220         */
 221        __be64          sb_icount;      /* allocated inodes */
 222        __be64          sb_ifree;       /* free inodes */
 223        __be64          sb_fdblocks;    /* free data blocks */
 224        __be64          sb_frextents;   /* free realtime extents */
 225        /*
 226         * End contiguous fields.
 227         */
 228        __be64          sb_uquotino;    /* user quota inode */
 229        __be64          sb_gquotino;    /* group quota inode */
 230        __be16          sb_qflags;      /* quota flags */
 231        __u8            sb_flags;       /* misc. flags */
 232        __u8            sb_shared_vn;   /* shared version number */
 233        __be32          sb_inoalignmt;  /* inode chunk alignment, fsblocks */
 234        __be32          sb_unit;        /* stripe or raid unit */
 235        __be32          sb_width;       /* stripe or raid width */
 236        __u8            sb_dirblklog;   /* log2 of dir block size (fsbs) */
 237        __u8            sb_logsectlog;  /* log2 of the log sector size */
 238        __be16          sb_logsectsize; /* sector size for the log, bytes */
 239        __be32          sb_logsunit;    /* stripe unit size for the log */
 240        __be32          sb_features2;   /* additional feature bits */
 241        /*
 242         * bad features2 field as a result of failing to pad the sb
 243         * structure to 64 bits. Some machines will be using this field
 244         * for features2 bits. Easiest just to mark it bad and not use
 245         * it for anything else.
 246         */
 247        __be32          sb_bad_features2;
 248
 249        /* version 5 superblock fields start here */
 250
 251        /* feature masks */
 252        __be32          sb_features_compat;
 253        __be32          sb_features_ro_compat;
 254        __be32          sb_features_incompat;
 255        __be32          sb_features_log_incompat;
 256
 257        __le32          sb_crc;         /* superblock crc */
 258        __be32          sb_pad;
 259
 260        __be64          sb_pquotino;    /* project quota inode */
 261        __be64          sb_lsn;         /* last write sequence */
 262
 263        /* must be padded to 64 bit alignment */
 264} xfs_dsb_t;
 265
 266/*
 267 * Sequence number values for the fields.
 268 */
 269typedef enum {
 270        XFS_SBS_MAGICNUM, XFS_SBS_BLOCKSIZE, XFS_SBS_DBLOCKS, XFS_SBS_RBLOCKS,
 271        XFS_SBS_REXTENTS, XFS_SBS_UUID, XFS_SBS_LOGSTART, XFS_SBS_ROOTINO,
 272        XFS_SBS_RBMINO, XFS_SBS_RSUMINO, XFS_SBS_REXTSIZE, XFS_SBS_AGBLOCKS,
 273        XFS_SBS_AGCOUNT, XFS_SBS_RBMBLOCKS, XFS_SBS_LOGBLOCKS,
 274        XFS_SBS_VERSIONNUM, XFS_SBS_SECTSIZE, XFS_SBS_INODESIZE,
 275        XFS_SBS_INOPBLOCK, XFS_SBS_FNAME, XFS_SBS_BLOCKLOG,
 276        XFS_SBS_SECTLOG, XFS_SBS_INODELOG, XFS_SBS_INOPBLOG, XFS_SBS_AGBLKLOG,
 277        XFS_SBS_REXTSLOG, XFS_SBS_INPROGRESS, XFS_SBS_IMAX_PCT, XFS_SBS_ICOUNT,
 278        XFS_SBS_IFREE, XFS_SBS_FDBLOCKS, XFS_SBS_FREXTENTS, XFS_SBS_UQUOTINO,
 279        XFS_SBS_GQUOTINO, XFS_SBS_QFLAGS, XFS_SBS_FLAGS, XFS_SBS_SHARED_VN,
 280        XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG,
 281        XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT,
 282        XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2, XFS_SBS_FEATURES_COMPAT,
 283        XFS_SBS_FEATURES_RO_COMPAT, XFS_SBS_FEATURES_INCOMPAT,
 284        XFS_SBS_FEATURES_LOG_INCOMPAT, XFS_SBS_CRC, XFS_SBS_PAD,
 285        XFS_SBS_PQUOTINO, XFS_SBS_LSN,
 286        XFS_SBS_FIELDCOUNT
 287} xfs_sb_field_t;
 288
 289/*
 290 * Mask values, defined based on the xfs_sb_field_t values.
 291 * Only define the ones we're using.
 292 */
 293#define XFS_SB_MVAL(x)          (1LL << XFS_SBS_ ## x)
 294#define XFS_SB_UUID             XFS_SB_MVAL(UUID)
 295#define XFS_SB_FNAME            XFS_SB_MVAL(FNAME)
 296#define XFS_SB_ROOTINO          XFS_SB_MVAL(ROOTINO)
 297#define XFS_SB_RBMINO           XFS_SB_MVAL(RBMINO)
 298#define XFS_SB_RSUMINO          XFS_SB_MVAL(RSUMINO)
 299#define XFS_SB_VERSIONNUM       XFS_SB_MVAL(VERSIONNUM)
 300#define XFS_SB_UQUOTINO         XFS_SB_MVAL(UQUOTINO)
 301#define XFS_SB_GQUOTINO         XFS_SB_MVAL(GQUOTINO)
 302#define XFS_SB_QFLAGS           XFS_SB_MVAL(QFLAGS)
 303#define XFS_SB_SHARED_VN        XFS_SB_MVAL(SHARED_VN)
 304#define XFS_SB_UNIT             XFS_SB_MVAL(UNIT)
 305#define XFS_SB_WIDTH            XFS_SB_MVAL(WIDTH)
 306#define XFS_SB_ICOUNT           XFS_SB_MVAL(ICOUNT)
 307#define XFS_SB_IFREE            XFS_SB_MVAL(IFREE)
 308#define XFS_SB_FDBLOCKS         XFS_SB_MVAL(FDBLOCKS)
 309#define XFS_SB_FEATURES2        XFS_SB_MVAL(FEATURES2)
 310#define XFS_SB_BAD_FEATURES2    XFS_SB_MVAL(BAD_FEATURES2)
 311#define XFS_SB_FEATURES_COMPAT  XFS_SB_MVAL(FEATURES_COMPAT)
 312#define XFS_SB_FEATURES_RO_COMPAT XFS_SB_MVAL(FEATURES_RO_COMPAT)
 313#define XFS_SB_FEATURES_INCOMPAT XFS_SB_MVAL(FEATURES_INCOMPAT)
 314#define XFS_SB_FEATURES_LOG_INCOMPAT XFS_SB_MVAL(FEATURES_LOG_INCOMPAT)
 315#define XFS_SB_CRC              XFS_SB_MVAL(CRC)
 316#define XFS_SB_PQUOTINO         XFS_SB_MVAL(PQUOTINO)
 317#define XFS_SB_NUM_BITS         ((int)XFS_SBS_FIELDCOUNT)
 318#define XFS_SB_ALL_BITS         ((1LL << XFS_SB_NUM_BITS) - 1)
 319#define XFS_SB_MOD_BITS         \
 320        (XFS_SB_UUID | XFS_SB_ROOTINO | XFS_SB_RBMINO | XFS_SB_RSUMINO | \
 321         XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO | XFS_SB_GQUOTINO | \
 322         XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \
 323         XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \
 324         XFS_SB_BAD_FEATURES2 | XFS_SB_FEATURES_COMPAT | \
 325         XFS_SB_FEATURES_RO_COMPAT | XFS_SB_FEATURES_INCOMPAT | \
 326         XFS_SB_FEATURES_LOG_INCOMPAT | XFS_SB_PQUOTINO)
 327
 328
 329/*
 330 * Misc. Flags - warning - these will be cleared by xfs_repair unless
 331 * a feature bit is set when the flag is used.
 332 */
 333#define XFS_SBF_NOFLAGS         0x00    /* no flags set */
 334#define XFS_SBF_READONLY        0x01    /* only read-only mounts allowed */
 335
 336/*
 337 * define max. shared version we can interoperate with
 338 */
 339#define XFS_SB_MAX_SHARED_VN    0
 340
 341#define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
 342
 343static inline int xfs_sb_good_version(xfs_sb_t *sbp)
 344{
 345        /* We always support version 1-3 */
 346        if (sbp->sb_versionnum >= XFS_SB_VERSION_1 &&
 347            sbp->sb_versionnum <= XFS_SB_VERSION_3)
 348                return 1;
 349
 350        /* We support version 4 if all feature bits are supported */
 351        if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) {
 352                if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) ||
 353                    ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
 354                     (sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS)))
 355                        return 0;
 356
 357#ifdef __KERNEL__
 358                if (sbp->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
 359                        return 0;
 360#else
 361                if ((sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT) &&
 362                    sbp->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
 363                        return 0;
 364#endif
 365
 366                return 1;
 367        }
 368        if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5)
 369                return 1;
 370
 371        return 0;
 372}
 373
 374/*
 375 * Detect a mismatched features2 field.  Older kernels read/wrote
 376 * this into the wrong slot, so to be safe we keep them in sync.
 377 */
 378static inline int xfs_sb_has_mismatched_features2(xfs_sb_t *sbp)
 379{
 380        return (sbp->sb_bad_features2 != sbp->sb_features2);
 381}
 382
 383static inline unsigned xfs_sb_version_tonew(unsigned v)
 384{
 385        if (v == XFS_SB_VERSION_1)
 386                return XFS_SB_VERSION_4;
 387
 388        if (v == XFS_SB_VERSION_2)
 389                return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
 390
 391        return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT |
 392                XFS_SB_VERSION_NLINKBIT;
 393}
 394
 395static inline unsigned xfs_sb_version_toold(unsigned v)
 396{
 397        if (v & (XFS_SB_VERSION_QUOTABIT | XFS_SB_VERSION_ALIGNBIT))
 398                return 0;
 399        if (v & XFS_SB_VERSION_NLINKBIT)
 400                return XFS_SB_VERSION_3;
 401        if (v & XFS_SB_VERSION_ATTRBIT)
 402                return XFS_SB_VERSION_2;
 403        return XFS_SB_VERSION_1;
 404}
 405
 406static inline int xfs_sb_version_hasattr(xfs_sb_t *sbp)
 407{
 408        return sbp->sb_versionnum == XFS_SB_VERSION_2 ||
 409                sbp->sb_versionnum == XFS_SB_VERSION_3 ||
 410                (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 411                 (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT));
 412}
 413
 414static inline void xfs_sb_version_addattr(xfs_sb_t *sbp)
 415{
 416        if (sbp->sb_versionnum == XFS_SB_VERSION_1)
 417                sbp->sb_versionnum = XFS_SB_VERSION_2;
 418        else if (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4)
 419                sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
 420        else
 421                sbp->sb_versionnum = XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
 422}
 423
 424static inline int xfs_sb_version_hasnlink(xfs_sb_t *sbp)
 425{
 426        return sbp->sb_versionnum == XFS_SB_VERSION_3 ||
 427                 (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 428                  (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT));
 429}
 430
 431static inline void xfs_sb_version_addnlink(xfs_sb_t *sbp)
 432{
 433        if (sbp->sb_versionnum <= XFS_SB_VERSION_2)
 434                sbp->sb_versionnum = XFS_SB_VERSION_3;
 435        else
 436                sbp->sb_versionnum |= XFS_SB_VERSION_NLINKBIT;
 437}
 438
 439static inline int xfs_sb_version_hasquota(xfs_sb_t *sbp)
 440{
 441        return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 442                (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
 443}
 444
 445static inline void xfs_sb_version_addquota(xfs_sb_t *sbp)
 446{
 447        if (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4)
 448                sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
 449        else
 450                sbp->sb_versionnum = xfs_sb_version_tonew(sbp->sb_versionnum) |
 451                                        XFS_SB_VERSION_QUOTABIT;
 452}
 453
 454static inline int xfs_sb_version_hasalign(xfs_sb_t *sbp)
 455{
 456        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 457               (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 458                (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT));
 459}
 460
 461static inline int xfs_sb_version_hasdalign(xfs_sb_t *sbp)
 462{
 463        return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 464                (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
 465}
 466
 467static inline int xfs_sb_version_hasshared(xfs_sb_t *sbp)
 468{
 469        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 470                (sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT);
 471}
 472
 473static inline int xfs_sb_version_hasdirv2(xfs_sb_t *sbp)
 474{
 475        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 476               (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 477                (sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT));
 478}
 479
 480static inline int xfs_sb_version_haslogv2(xfs_sb_t *sbp)
 481{
 482        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 483               (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 484                (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT));
 485}
 486
 487static inline int xfs_sb_version_hasextflgbit(xfs_sb_t *sbp)
 488{
 489        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 490               (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 491                (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT));
 492}
 493
 494static inline int xfs_sb_version_hassector(xfs_sb_t *sbp)
 495{
 496        return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 497                (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
 498}
 499
 500static inline int xfs_sb_version_hasasciici(xfs_sb_t *sbp)
 501{
 502        return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 503                (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
 504}
 505
 506static inline int xfs_sb_version_hasmorebits(xfs_sb_t *sbp)
 507{
 508        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 509               (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 510                (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT));
 511}
 512
 513/*
 514 * sb_features2 bit version macros.
 515 *
 516 * For example, for a bit defined as XFS_SB_VERSION2_FUNBIT, has a macro:
 517 *
 518 * SB_VERSION_HASFUNBIT(xfs_sb_t *sbp)
 519 *      ((xfs_sb_version_hasmorebits(sbp) &&
 520 *       ((sbp)->sb_features2 & XFS_SB_VERSION2_FUNBIT)
 521 */
 522
 523static inline int xfs_sb_version_haslazysbcount(xfs_sb_t *sbp)
 524{
 525        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 526               (xfs_sb_version_hasmorebits(sbp) &&
 527                (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT));
 528}
 529
 530static inline int xfs_sb_version_hasattr2(xfs_sb_t *sbp)
 531{
 532        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 533               (xfs_sb_version_hasmorebits(sbp) &&
 534                (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT));
 535}
 536
 537static inline void xfs_sb_version_addattr2(xfs_sb_t *sbp)
 538{
 539        sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
 540        sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
 541}
 542
 543static inline void xfs_sb_version_removeattr2(xfs_sb_t *sbp)
 544{
 545        sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
 546        if (!sbp->sb_features2)
 547                sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
 548}
 549
 550static inline int xfs_sb_version_hasprojid32bit(xfs_sb_t *sbp)
 551{
 552        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 553               (xfs_sb_version_hasmorebits(sbp) &&
 554                (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT));
 555}
 556
 557static inline int xfs_sb_version_hascrc(xfs_sb_t *sbp)
 558{
 559        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
 560}
 561
 562
 563/*
 564 * Extended v5 superblock feature masks. These are to be used for new v5
 565 * superblock features only.
 566 *
 567 * Compat features are new features that old kernels will not notice or affect
 568 * and so can mount read-write without issues.
 569 *
 570 * RO-Compat (read only) are features that old kernels can read but will break
 571 * if they write. Hence only read-only mounts of such filesystems are allowed on
 572 * kernels that don't support the feature bit.
 573 *
 574 * InCompat features are features which old kernels will not understand and so
 575 * must not mount.
 576 *
 577 * Log-InCompat features are for changes to log formats or new transactions that
 578 * can't be replayed on older kernels. The fields are set when the filesystem is
 579 * mounted, and a clean unmount clears the fields.
 580 */
 581#define XFS_SB_FEAT_COMPAT_ALL 0
 582#define XFS_SB_FEAT_COMPAT_UNKNOWN      ~XFS_SB_FEAT_COMPAT_ALL
 583static inline bool
 584xfs_sb_has_compat_feature(
 585        struct xfs_sb   *sbp,
 586        __uint32_t      feature)
 587{
 588        return (sbp->sb_features_compat & feature) != 0;
 589}
 590
 591#define XFS_SB_FEAT_RO_COMPAT_ALL 0
 592#define XFS_SB_FEAT_RO_COMPAT_UNKNOWN   ~XFS_SB_FEAT_RO_COMPAT_ALL
 593static inline bool
 594xfs_sb_has_ro_compat_feature(
 595        struct xfs_sb   *sbp,
 596        __uint32_t      feature)
 597{
 598        return (sbp->sb_features_ro_compat & feature) != 0;
 599}
 600
 601#define XFS_SB_FEAT_INCOMPAT_ALL 0
 602#define XFS_SB_FEAT_INCOMPAT_UNKNOWN    ~XFS_SB_FEAT_INCOMPAT_ALL
 603static inline bool
 604xfs_sb_has_incompat_feature(
 605        struct xfs_sb   *sbp,
 606        __uint32_t      feature)
 607{
 608        return (sbp->sb_features_incompat & feature) != 0;
 609}
 610
 611#define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
 612#define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN        ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
 613static inline bool
 614xfs_sb_has_incompat_log_feature(
 615        struct xfs_sb   *sbp,
 616        __uint32_t      feature)
 617{
 618        return (sbp->sb_features_log_incompat & feature) != 0;
 619}
 620
 621static inline bool
 622xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
 623{
 624        return (ino == sbp->sb_uquotino || ino == sbp->sb_gquotino);
 625}
 626
 627/*
 628 * end of superblock version macros
 629 */
 630
 631#define XFS_SB_DADDR            ((xfs_daddr_t)0) /* daddr in filesystem/ag */
 632#define XFS_SB_BLOCK(mp)        XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
 633#define XFS_BUF_TO_SBP(bp)      ((xfs_dsb_t *)((bp)->b_addr))
 634
 635#define XFS_HDR_BLOCK(mp,d)     ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
 636#define XFS_DADDR_TO_FSB(mp,d)  XFS_AGB_TO_FSB(mp, \
 637                        xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
 638#define XFS_FSB_TO_DADDR(mp,fsbno)      XFS_AGB_TO_DADDR(mp, \
 639                        XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
 640
 641/*
 642 * File system sector to basic block conversions.
 643 */
 644#define XFS_FSS_TO_BB(mp,sec)   ((sec) << (mp)->m_sectbb_log)
 645
 646/*
 647 * File system block to basic block conversions.
 648 */
 649#define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
 650#define XFS_BB_TO_FSB(mp,bb)    \
 651        (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
 652#define XFS_BB_TO_FSBT(mp,bb)   ((bb) >> (mp)->m_blkbb_log)
 653
 654/*
 655 * File system block to byte conversions.
 656 */
 657#define XFS_FSB_TO_B(mp,fsbno)  ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
 658#define XFS_B_TO_FSB(mp,b)      \
 659        ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
 660#define XFS_B_TO_FSBT(mp,b)     (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
 661#define XFS_B_FSB_OFFSET(mp,b)  ((b) & (mp)->m_blockmask)
 662
 663#endif  /* __XFS_SB_H__ */
 664
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