fs/xfs/xfs_sb.h

   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
  27 struct xfs_buf;
  28 struct xfs_mount;
  29 struct xfs_trans;
  30
  31 #define XFS_SB_MAGIC            0x58465342      /* 'XFSB' */
  32 #define XFS_SB_VERSION_1        1               /* 5.3, 6.0.1, 6.1 */
  33 #define XFS_SB_VERSION_2        2               /* 6.2 - attributes */
  34 #define XFS_SB_VERSION_3        3               /* 6.2 - new inode version */
  35 #define XFS_SB_VERSION_4        4               /* 6.2+ - bitmask version */
  36 #define XFS_SB_VERSION_5        5               /* CRC enabled filesystem */
  37 #define XFS_SB_VERSION_NUMBITS          0x000f
  38 #define XFS_SB_VERSION_ALLFBITS         0xfff0
  39 #define XFS_SB_VERSION_ATTRBIT          0x0010
  40 #define XFS_SB_VERSION_NLINKBIT         0x0020
  41 #define XFS_SB_VERSION_QUOTABIT         0x0040
  42 #define XFS_SB_VERSION_ALIGNBIT         0x0080
  43 #define XFS_SB_VERSION_DALIGNBIT        0x0100
  44 #define XFS_SB_VERSION_SHAREDBIT        0x0200
  45 #define XFS_SB_VERSION_LOGV2BIT         0x0400
  46 #define XFS_SB_VERSION_SECTORBIT        0x0800
  47 #define XFS_SB_VERSION_EXTFLGBIT        0x1000
  48 #define XFS_SB_VERSION_DIRV2BIT         0x2000
  49 #define XFS_SB_VERSION_BORGBIT          0x4000  /* ASCII only case-insens. */
  50 #define XFS_SB_VERSION_MOREBITSBIT      0x8000
  51
  52 /*
  53  * Supported feature bit list is just all bits in the versionnum field because
  54  * we've used them all up and understand them all. Except, of course, for the
  55  * shared superblock bit, which nobody knows what it does and so is unsupported.
  56  */
  57 #define XFS_SB_VERSION_OKBITS           \
  58         ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \
  59                 ~XFS_SB_VERSION_SHAREDBIT)
  60
  61 /*
  62  * There are two words to hold XFS "feature" bits: the original
  63  * word, sb_versionnum, and sb_features2.  Whenever a bit is set in
  64  * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
  65  *
  66  * These defines represent bits in sb_features2.
  67  */
  68 #define XFS_SB_VERSION2_RESERVED1BIT    0x00000001
  69 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT  0x00000002      /* Superblk counters */
  70 #define XFS_SB_VERSION2_RESERVED4BIT    0x00000004
  71 #define XFS_SB_VERSION2_ATTR2BIT        0x00000008      /* Inline attr rework */
  72 #define XFS_SB_VERSION2_PARENTBIT       0x00000010      /* parent pointers */
  73 #define XFS_SB_VERSION2_PROJID32BIT     0x00000080      /* 32 bit project id */
  74 #define XFS_SB_VERSION2_CRCBIT          0x00000100      /* metadata CRCs */
  75 #define XFS_SB_VERSION2_FTYPE           0x00000200      /* inode type in dir */
  76
  77 #define XFS_SB_VERSION2_OKBITS          \
  78         (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
  79          XFS_SB_VERSION2_ATTR2BIT       | \
  80          XFS_SB_VERSION2_PROJID32BIT    | \
  81          XFS_SB_VERSION2_FTYPE)
  82
  83 /*
  84  * Superblock - in core version.  Must match the ondisk version below.
  85  * Must be padded to 64 bit alignment.
  86  */
  87 typedef struct xfs_sb {
  88         __uint32_t      sb_magicnum;    /* magic number == XFS_SB_MAGIC */
  89         __uint32_t      sb_blocksize;   /* logical block size, bytes */
  90         xfs_drfsbno_t   sb_dblocks;     /* number of data blocks */
  91         xfs_drfsbno_t   sb_rblocks;     /* number of realtime blocks */
  92         xfs_drtbno_t    sb_rextents;    /* number of realtime extents */
  93         uuid_t          sb_uuid;        /* file system unique id */
  94         xfs_dfsbno_t    sb_logstart;    /* starting block of log if internal */
  95         xfs_ino_t       sb_rootino;     /* root inode number */
  96         xfs_ino_t       sb_rbmino;      /* bitmap inode for realtime extents */
  97         xfs_ino_t       sb_rsumino;     /* summary inode for rt bitmap */
  98         xfs_agblock_t   sb_rextsize;    /* realtime extent size, blocks */
  99         xfs_agblock_t   sb_agblocks;    /* size of an allocation group */
 100         xfs_agnumber_t  sb_agcount;     /* number of allocation groups */
 101         xfs_extlen_t    sb_rbmblocks;   /* number of rt bitmap blocks */
 102         xfs_extlen_t    sb_logblocks;   /* number of log blocks */
 103         __uint16_t      sb_versionnum;  /* header version == XFS_SB_VERSION */
 104         __uint16_t      sb_sectsize;    /* volume sector size, bytes */
 105         __uint16_t      sb_inodesize;   /* inode size, bytes */
 106         __uint16_t      sb_inopblock;   /* inodes per block */
 107         char            sb_fname[12];   /* file system name */
 108         __uint8_t       sb_blocklog;    /* log2 of sb_blocksize */
 109         __uint8_t       sb_sectlog;     /* log2 of sb_sectsize */
 110         __uint8_t       sb_inodelog;    /* log2 of sb_inodesize */
 111         __uint8_t       sb_inopblog;    /* log2 of sb_inopblock */
 112         __uint8_t       sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
 113         __uint8_t       sb_rextslog;    /* log2 of sb_rextents */
 114         __uint8_t       sb_inprogress;  /* mkfs is in progress, don't mount */
 115         __uint8_t       sb_imax_pct;    /* max % of fs for inode space */
 116                                         /* statistics */
 117         /*
 118          * These fields must remain contiguous.  If you really
 119          * want to change their layout, make sure you fix the
 120          * code in xfs_trans_apply_sb_deltas().
 121          */
 122         __uint64_t      sb_icount;      /* allocated inodes */
 123         __uint64_t      sb_ifree;       /* free inodes */
 124         __uint64_t      sb_fdblocks;    /* free data blocks */
 125         __uint64_t      sb_frextents;   /* free realtime extents */
 126         /*
 127          * End contiguous fields.
 128          */
 129         xfs_ino_t       sb_uquotino;    /* user quota inode */
 130         xfs_ino_t       sb_gquotino;    /* group quota inode */
 131         __uint16_t      sb_qflags;      /* quota flags */
 132         __uint8_t       sb_flags;       /* misc. flags */
 133         __uint8_t       sb_shared_vn;   /* shared version number */
 134         xfs_extlen_t    sb_inoalignmt;  /* inode chunk alignment, fsblocks */
 135         __uint32_t      sb_unit;        /* stripe or raid unit */
 136         __uint32_t      sb_width;       /* stripe or raid width */
 137         __uint8_t       sb_dirblklog;   /* log2 of dir block size (fsbs) */
 138         __uint8_t       sb_logsectlog;  /* log2 of the log sector size */
 139         __uint16_t      sb_logsectsize; /* sector size for the log, bytes */
 140         __uint32_t      sb_logsunit;    /* stripe unit size for the log */
 141         __uint32_t      sb_features2;   /* additional feature bits */
 142
 143         /*
 144          * bad features2 field as a result of failing to pad the sb
 145          * structure to 64 bits. Some machines will be using this field
 146          * for features2 bits. Easiest just to mark it bad and not use
 147          * it for anything else.
 148          */
 149         __uint32_t      sb_bad_features2;
 150
 151         /* version 5 superblock fields start here */
 152
 153         /* feature masks */
 154         __uint32_t      sb_features_compat;
 155         __uint32_t      sb_features_ro_compat;
 156         __uint32_t      sb_features_incompat;
 157         __uint32_t      sb_features_log_incompat;
 158
 159         __uint32_t      sb_crc;         /* superblock crc */
 160         __uint32_t      sb_pad;
 161
 162         xfs_ino_t       sb_pquotino;    /* project quota inode */
 163         xfs_lsn_t       sb_lsn;         /* last write sequence */
 164
 165         /* must be padded to 64 bit alignment */
 166 } xfs_sb_t;
 167
 168 #define XFS_SB_CRC_OFF          offsetof(struct xfs_sb, sb_crc)
 169
 170 /*
 171  * Superblock - on disk version.  Must match the in core version above.
 172  * Must be padded to 64 bit alignment.
 173  */
 174 typedef struct xfs_dsb {
 175         __be32          sb_magicnum;    /* magic number == XFS_SB_MAGIC */
 176         __be32          sb_blocksize;   /* logical block size, bytes */
 177         __be64          sb_dblocks;     /* number of data blocks */
 178         __be64          sb_rblocks;     /* number of realtime blocks */
 179         __be64          sb_rextents;    /* number of realtime extents */
 180         uuid_t          sb_uuid;        /* file system unique id */
 181         __be64          sb_logstart;    /* starting block of log if internal */
 182         __be64          sb_rootino;     /* root inode number */
 183         __be64          sb_rbmino;      /* bitmap inode for realtime extents */
 184         __be64          sb_rsumino;     /* summary inode for rt bitmap */
 185         __be32          sb_rextsize;    /* realtime extent size, blocks */
 186         __be32          sb_agblocks;    /* size of an allocation group */
 187         __be32          sb_agcount;     /* number of allocation groups */
 188         __be32          sb_rbmblocks;   /* number of rt bitmap blocks */
 189         __be32          sb_logblocks;   /* number of log blocks */
 190         __be16          sb_versionnum;  /* header version == XFS_SB_VERSION */
 191         __be16          sb_sectsize;    /* volume sector size, bytes */
 192         __be16          sb_inodesize;   /* inode size, bytes */
 193         __be16          sb_inopblock;   /* inodes per block */
 194         char            sb_fname[12];   /* file system name */
 195         __u8            sb_blocklog;    /* log2 of sb_blocksize */
 196         __u8            sb_sectlog;     /* log2 of sb_sectsize */
 197         __u8            sb_inodelog;    /* log2 of sb_inodesize */
 198         __u8            sb_inopblog;    /* log2 of sb_inopblock */
 199         __u8            sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
 200         __u8            sb_rextslog;    /* log2 of sb_rextents */
 201         __u8            sb_inprogress;  /* mkfs is in progress, don't mount */
 202         __u8            sb_imax_pct;    /* max % of fs for inode space */
 203                                         /* statistics */
 204         /*
 205          * These fields must remain contiguous.  If you really
 206          * want to change their layout, make sure you fix the
 207          * code in xfs_trans_apply_sb_deltas().
 208          */
 209         __be64          sb_icount;      /* allocated inodes */
 210         __be64          sb_ifree;       /* free inodes */
 211         __be64          sb_fdblocks;    /* free data blocks */
 212         __be64          sb_frextents;   /* free realtime extents */
 213         /*
 214          * End contiguous fields.
 215          */
 216         __be64          sb_uquotino;    /* user quota inode */
 217         __be64          sb_gquotino;    /* group quota inode */
 218         __be16          sb_qflags;      /* quota flags */
 219         __u8            sb_flags;       /* misc. flags */
 220         __u8            sb_shared_vn;   /* shared version number */
 221         __be32          sb_inoalignmt;  /* inode chunk alignment, fsblocks */
 222         __be32          sb_unit;        /* stripe or raid unit */
 223         __be32          sb_width;       /* stripe or raid width */
 224         __u8            sb_dirblklog;   /* log2 of dir block size (fsbs) */
 225         __u8            sb_logsectlog;  /* log2 of the log sector size */
 226         __be16          sb_logsectsize; /* sector size for the log, bytes */
 227         __be32          sb_logsunit;    /* stripe unit size for the log */
 228         __be32          sb_features2;   /* additional feature bits */
 229         /*
 230          * bad features2 field as a result of failing to pad the sb
 231          * structure to 64 bits. Some machines will be using this field
 232          * for features2 bits. Easiest just to mark it bad and not use
 233          * it for anything else.
 234          */
 235         __be32          sb_bad_features2;
 236
 237         /* version 5 superblock fields start here */
 238
 239         /* feature masks */
 240         __be32          sb_features_compat;
 241         __be32          sb_features_ro_compat;
 242         __be32          sb_features_incompat;
 243         __be32          sb_features_log_incompat;
 244
 245         __le32          sb_crc;         /* superblock crc */
 246         __be32          sb_pad;
 247
 248         __be64          sb_pquotino;    /* project quota inode */
 249         __be64          sb_lsn;         /* last write sequence */
 250
 251         /* must be padded to 64 bit alignment */
 252 } xfs_dsb_t;
 253
 254 /*
 255  * Sequence number values for the fields.
 256  */
 257 typedef enum {
 258         XFS_SBS_MAGICNUM, XFS_SBS_BLOCKSIZE, XFS_SBS_DBLOCKS, XFS_SBS_RBLOCKS,
 259         XFS_SBS_REXTENTS, XFS_SBS_UUID, XFS_SBS_LOGSTART, XFS_SBS_ROOTINO,
 260         XFS_SBS_RBMINO, XFS_SBS_RSUMINO, XFS_SBS_REXTSIZE, XFS_SBS_AGBLOCKS,
 261         XFS_SBS_AGCOUNT, XFS_SBS_RBMBLOCKS, XFS_SBS_LOGBLOCKS,
 262         XFS_SBS_VERSIONNUM, XFS_SBS_SECTSIZE, XFS_SBS_INODESIZE,
 263         XFS_SBS_INOPBLOCK, XFS_SBS_FNAME, XFS_SBS_BLOCKLOG,
 264         XFS_SBS_SECTLOG, XFS_SBS_INODELOG, XFS_SBS_INOPBLOG, XFS_SBS_AGBLKLOG,
 265         XFS_SBS_REXTSLOG, XFS_SBS_INPROGRESS, XFS_SBS_IMAX_PCT, XFS_SBS_ICOUNT,
 266         XFS_SBS_IFREE, XFS_SBS_FDBLOCKS, XFS_SBS_FREXTENTS, XFS_SBS_UQUOTINO,
 267         XFS_SBS_GQUOTINO, XFS_SBS_QFLAGS, XFS_SBS_FLAGS, XFS_SBS_SHARED_VN,
 268         XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG,
 269         XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT,
 270         XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2, XFS_SBS_FEATURES_COMPAT,
 271         XFS_SBS_FEATURES_RO_COMPAT, XFS_SBS_FEATURES_INCOMPAT,
 272         XFS_SBS_FEATURES_LOG_INCOMPAT, XFS_SBS_CRC, XFS_SBS_PAD,
 273         XFS_SBS_PQUOTINO, XFS_SBS_LSN,
 274         XFS_SBS_FIELDCOUNT
 275 } xfs_sb_field_t;
 276
 277 /*
 278  * Mask values, defined based on the xfs_sb_field_t values.
 279  * Only define the ones we're using.
 280  */
 281 #define XFS_SB_MVAL(x)          (1LL << XFS_SBS_ ## x)
 282 #define XFS_SB_UUID             XFS_SB_MVAL(UUID)
 283 #define XFS_SB_FNAME            XFS_SB_MVAL(FNAME)
 284 #define XFS_SB_ROOTINO          XFS_SB_MVAL(ROOTINO)
 285 #define XFS_SB_RBMINO           XFS_SB_MVAL(RBMINO)
 286 #define XFS_SB_RSUMINO          XFS_SB_MVAL(RSUMINO)
 287 #define XFS_SB_VERSIONNUM       XFS_SB_MVAL(VERSIONNUM)
 288 #define XFS_SB_UQUOTINO         XFS_SB_MVAL(UQUOTINO)
 289 #define XFS_SB_GQUOTINO         XFS_SB_MVAL(GQUOTINO)
 290 #define XFS_SB_QFLAGS           XFS_SB_MVAL(QFLAGS)
 291 #define XFS_SB_SHARED_VN        XFS_SB_MVAL(SHARED_VN)
 292 #define XFS_SB_UNIT             XFS_SB_MVAL(UNIT)
 293 #define XFS_SB_WIDTH            XFS_SB_MVAL(WIDTH)
 294 #define XFS_SB_ICOUNT           XFS_SB_MVAL(ICOUNT)
 295 #define XFS_SB_IFREE            XFS_SB_MVAL(IFREE)
 296 #define XFS_SB_FDBLOCKS         XFS_SB_MVAL(FDBLOCKS)
 297 #define XFS_SB_FEATURES2        XFS_SB_MVAL(FEATURES2)
 298 #define XFS_SB_BAD_FEATURES2    XFS_SB_MVAL(BAD_FEATURES2)
 299 #define XFS_SB_FEATURES_COMPAT  XFS_SB_MVAL(FEATURES_COMPAT)
 300 #define XFS_SB_FEATURES_RO_COMPAT XFS_SB_MVAL(FEATURES_RO_COMPAT)
 301 #define XFS_SB_FEATURES_INCOMPAT XFS_SB_MVAL(FEATURES_INCOMPAT)
 302 #define XFS_SB_FEATURES_LOG_INCOMPAT XFS_SB_MVAL(FEATURES_LOG_INCOMPAT)
 303 #define XFS_SB_CRC              XFS_SB_MVAL(CRC)
 304 #define XFS_SB_PQUOTINO         XFS_SB_MVAL(PQUOTINO)
 305 #define XFS_SB_NUM_BITS         ((int)XFS_SBS_FIELDCOUNT)
 306 #define XFS_SB_ALL_BITS         ((1LL << XFS_SB_NUM_BITS) - 1)
 307 #define XFS_SB_MOD_BITS         \
 308         (XFS_SB_UUID | XFS_SB_ROOTINO | XFS_SB_RBMINO | XFS_SB_RSUMINO | \
 309          XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO | XFS_SB_GQUOTINO | \
 310          XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \
 311          XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \
 312          XFS_SB_BAD_FEATURES2 | XFS_SB_FEATURES_COMPAT | \
 313          XFS_SB_FEATURES_RO_COMPAT | XFS_SB_FEATURES_INCOMPAT | \
 314          XFS_SB_FEATURES_LOG_INCOMPAT | XFS_SB_PQUOTINO)
 315
 316
 317 /*
 318  * Misc. Flags - warning - these will be cleared by xfs_repair unless
 319  * a feature bit is set when the flag is used.
 320  */
 321 #define XFS_SBF_NOFLAGS         0x00    /* no flags set */
 322 #define XFS_SBF_READONLY        0x01    /* only read-only mounts allowed */
 323
 324 /*
 325  * define max. shared version we can interoperate with
 326  */
 327 #define XFS_SB_MAX_SHARED_VN    0
 328
 329 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
 330
 331 /*
 332  * The first XFS version we support is a v4 superblock with V2 directories.
 333  */
 334 static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp)
 335 {
 336         if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT))
 337                 return false;
 338
 339         /* check for unknown features in the fs */
 340         if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) ||
 341             ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
 342              (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS)))
 343                 return false;
 344
 345         return true;
 346 }
 347
 348 static inline bool xfs_sb_good_version(struct xfs_sb *sbp)
 349 {
 350         if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5)
 351                 return true;
 352         if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
 353                 return xfs_sb_good_v4_features(sbp);
 354         return false;
 355 }
 356
 357 /*
 358  * Detect a mismatched features2 field.  Older kernels read/wrote
 359  * this into the wrong slot, so to be safe we keep them in sync.
 360  */
 361 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp)
 362 {
 363         return sbp->sb_bad_features2 != sbp->sb_features2;
 364 }
 365
 366 static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp)
 367 {
 368         return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT);
 369 }
 370
 371 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp)
 372 {
 373         sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
 374 }
 375
 376 static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp)
 377 {
 378         return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
 379 }
 380
 381 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp)
 382 {
 383         sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
 384 }
 385
 386 static inline bool xfs_sb_version_hasalign(struct xfs_sb *sbp)
 387 {
 388         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
 389                 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT));
 390 }
 391
 392 static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp)
 393 {
 394         return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
 395 }
 396
 397 static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp)
 398 {
 399         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
 400                (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
 401 }
 402
 403 static inline bool xfs_sb_version_hasextflgbit(struct xfs_sb *sbp)
 404 {
 405         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
 406                (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT);
 407 }
 408
 409 static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp)
 410 {
 411         return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
 412 }
 413
 414 static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp)
 415 {
 416         return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
 417 }
 418
 419 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp)
 420 {
 421         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
 422                (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
 423 }
 424
 425 /*
 426  * sb_features2 bit version macros.
 427  */
 428 static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb *sbp)
 429 {
 430         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 431                (xfs_sb_version_hasmorebits(sbp) &&
 432                 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT));
 433 }
 434
 435 static inline bool xfs_sb_version_hasattr2(struct xfs_sb *sbp)
 436 {
 437         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 438                (xfs_sb_version_hasmorebits(sbp) &&
 439                 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT));
 440 }
 441
 442 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp)
 443 {
 444         sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
 445         sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
 446         sbp->sb_bad_features2 |= XFS_SB_VERSION2_ATTR2BIT;
 447 }
 448
 449 static inline void xfs_sb_version_removeattr2(struct xfs_sb *sbp)
 450 {
 451         sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
 452         sbp->sb_bad_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
 453         if (!sbp->sb_features2)
 454                 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
 455 }
 456
 457 static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb *sbp)
 458 {
 459         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 460                (xfs_sb_version_hasmorebits(sbp) &&
 461                 (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT));
 462 }
 463
 464 static inline void xfs_sb_version_addprojid32bit(struct xfs_sb *sbp)
 465 {
 466         sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
 467         sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT;
 468         sbp->sb_bad_features2 |= XFS_SB_VERSION2_PROJID32BIT;
 469 }
 470
 471 /*
 472  * Extended v5 superblock feature masks. These are to be used for new v5
 473  * superblock features only.
 474  *
 475  * Compat features are new features that old kernels will not notice or affect
 476  * and so can mount read-write without issues.
 477  *
 478  * RO-Compat (read only) are features that old kernels can read but will break
 479  * if they write. Hence only read-only mounts of such filesystems are allowed on
 480  * kernels that don't support the feature bit.
 481  *
 482  * InCompat features are features which old kernels will not understand and so
 483  * must not mount.
 484  *
 485  * Log-InCompat features are for changes to log formats or new transactions that
 486  * can't be replayed on older kernels. The fields are set when the filesystem is
 487  * mounted, and a clean unmount clears the fields.
 488  */
 489 #define XFS_SB_FEAT_COMPAT_ALL 0
 490 #define XFS_SB_FEAT_COMPAT_UNKNOWN      ~XFS_SB_FEAT_COMPAT_ALL
 491 static inline bool
 492 xfs_sb_has_compat_feature(
 493         struct xfs_sb   *sbp,
 494         __uint32_t      feature)
 495 {
 496         return (sbp->sb_features_compat & feature) != 0;
 497 }
 498
 499 #define XFS_SB_FEAT_RO_COMPAT_FINOBT   (1 << 0)         /* free inode btree */
 500 #define XFS_SB_FEAT_RO_COMPAT_ALL \
 501                 (XFS_SB_FEAT_RO_COMPAT_FINOBT)
 502 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN   ~XFS_SB_FEAT_RO_COMPAT_ALL
 503 static inline bool
 504 xfs_sb_has_ro_compat_feature(
 505         struct xfs_sb   *sbp,
 506         __uint32_t      feature)
 507 {
 508         return (sbp->sb_features_ro_compat & feature) != 0;
 509 }
 510
 511 #define XFS_SB_FEAT_INCOMPAT_FTYPE      (1 << 0)        /* filetype in dirent */
 512 #define XFS_SB_FEAT_INCOMPAT_ALL \
 513                 (XFS_SB_FEAT_INCOMPAT_FTYPE)
 514
 515 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN    ~XFS_SB_FEAT_INCOMPAT_ALL
 516 static inline bool
 517 xfs_sb_has_incompat_feature(
 518         struct xfs_sb   *sbp,
 519         __uint32_t      feature)
 520 {
 521         return (sbp->sb_features_incompat & feature) != 0;
 522 }
 523
 524 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
 525 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN        ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
 526 static inline bool
 527 xfs_sb_has_incompat_log_feature(
 528         struct xfs_sb   *sbp,
 529         __uint32_t      feature)
 530 {
 531         return (sbp->sb_features_log_incompat & feature) != 0;
 532 }
 533
 534 /*
 535  * V5 superblock specific feature checks
 536  */
 537 static inline int xfs_sb_version_hascrc(struct xfs_sb *sbp)
 538 {
 539         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
 540 }
 541
 542 static inline int xfs_sb_version_has_pquotino(struct xfs_sb *sbp)
 543 {
 544         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
 545 }
 546
 547 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp)
 548 {
 549         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
 550                 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) ||
 551                (xfs_sb_version_hasmorebits(sbp) &&
 552                  (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE));
 553 }
 554
 555 static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp)
 556 {
 557         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
 558                 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT);
 559 }
 560
 561 /*
 562  * end of superblock version macros
 563  */
 564
 565 static inline bool
 566 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
 567 {
 568         return (ino == sbp->sb_uquotino ||
 569                 ino == sbp->sb_gquotino ||
 570                 ino == sbp->sb_pquotino);
 571 }
 572
 573 #define XFS_SB_DADDR            ((xfs_daddr_t)0) /* daddr in filesystem/ag */
 574 #define XFS_SB_BLOCK(mp)        XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
 575 #define XFS_BUF_TO_SBP(bp)      ((xfs_dsb_t *)((bp)->b_addr))
 576
 577 #define XFS_HDR_BLOCK(mp,d)     ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
 578 #define XFS_DADDR_TO_FSB(mp,d)  XFS_AGB_TO_FSB(mp, \
 579                         xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
 580 #define XFS_FSB_TO_DADDR(mp,fsbno)      XFS_AGB_TO_DADDR(mp, \
 581                         XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
 582
 583 /*
 584  * File system sector to basic block conversions.
 585  */
 586 #define XFS_FSS_TO_BB(mp,sec)   ((sec) << (mp)->m_sectbb_log)
 587
 588 /*
 589  * File system block to basic block conversions.
 590  */
 591 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
 592 #define XFS_BB_TO_FSB(mp,bb)    \
 593         (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
 594 #define XFS_BB_TO_FSBT(mp,bb)   ((bb) >> (mp)->m_blkbb_log)
 595
 596 /*
 597  * File system block to byte conversions.
 598  */
 599 #define XFS_FSB_TO_B(mp,fsbno)  ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
 600 #define XFS_B_TO_FSB(mp,b)      \
 601         ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
 602 #define XFS_B_TO_FSBT(mp,b)     (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
 603 #define XFS_B_FSB_OFFSET(mp,b)  ((b) & (mp)->m_blockmask)
 604
 605 /*
 606  * perag get/put wrappers for ref counting
 607  */
 608 extern struct xfs_perag *xfs_perag_get(struct xfs_mount *, xfs_agnumber_t);
 609 extern struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *, xfs_agnumber_t,
 610                                            int tag);
 611 extern void     xfs_perag_put(struct xfs_perag *pag);
 612 extern int      xfs_initialize_perag_data(struct xfs_mount *, xfs_agnumber_t);
 613
 614 extern void     xfs_sb_calc_crc(struct xfs_buf  *);
 615 extern void     xfs_mod_sb(struct xfs_trans *, __int64_t);
 616 extern void     xfs_sb_mount_common(struct xfs_mount *, struct xfs_sb *);
 617 extern void     xfs_sb_from_disk(struct xfs_sb *, struct xfs_dsb *);
 618 extern void     xfs_sb_to_disk(struct xfs_dsb *, struct xfs_sb *, __int64_t);
 619 extern void     xfs_sb_quota_from_disk(struct xfs_sb *sbp);
 620
 621 #endif  /* __XFS_SB_H__ */