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_SASHFBITS        0xf000
  40 #define XFS_SB_VERSION_REALFBITS        0x0ff0
  41 #define XFS_SB_VERSION_ATTRBIT          0x0010
  42 #define XFS_SB_VERSION_NLINKBIT         0x0020
  43 #define XFS_SB_VERSION_QUOTABIT         0x0040
  44 #define XFS_SB_VERSION_ALIGNBIT         0x0080
  45 #define XFS_SB_VERSION_DALIGNBIT        0x0100
  46 #define XFS_SB_VERSION_SHAREDBIT        0x0200
  47 #define XFS_SB_VERSION_LOGV2BIT         0x0400
  48 #define XFS_SB_VERSION_SECTORBIT        0x0800
  49 #define XFS_SB_VERSION_EXTFLGBIT        0x1000
  50 #define XFS_SB_VERSION_DIRV2BIT         0x2000
  51 #define XFS_SB_VERSION_BORGBIT          0x4000  /* ASCII only case-insens. */
  52 #define XFS_SB_VERSION_MOREBITSBIT      0x8000
  53 #define XFS_SB_VERSION_OKSASHFBITS      \
  54         (XFS_SB_VERSION_EXTFLGBIT | \
  55          XFS_SB_VERSION_DIRV2BIT | \
  56          XFS_SB_VERSION_BORGBIT)
  57 #define XFS_SB_VERSION_OKREALFBITS      \
  58         (XFS_SB_VERSION_ATTRBIT | \
  59          XFS_SB_VERSION_NLINKBIT | \
  60          XFS_SB_VERSION_QUOTABIT | \
  61          XFS_SB_VERSION_ALIGNBIT | \
  62          XFS_SB_VERSION_DALIGNBIT | \
  63          XFS_SB_VERSION_SHAREDBIT | \
  64          XFS_SB_VERSION_LOGV2BIT | \
  65          XFS_SB_VERSION_SECTORBIT | \
  66          XFS_SB_VERSION_MOREBITSBIT)
  67 #define XFS_SB_VERSION_OKREALBITS       \
  68         (XFS_SB_VERSION_NUMBITS | \
  69          XFS_SB_VERSION_OKREALFBITS | \
  70          XFS_SB_VERSION_OKSASHFBITS)
  71
  72 /*
  73  * There are two words to hold XFS "feature" bits: the original
  74  * word, sb_versionnum, and sb_features2.  Whenever a bit is set in
  75  * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
  76  *
  77  * These defines represent bits in sb_features2.
  78  */
  79 #define XFS_SB_VERSION2_REALFBITS       0x00ffffff      /* Mask: features */
  80 #define XFS_SB_VERSION2_RESERVED1BIT    0x00000001
  81 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT  0x00000002      /* Superblk counters */
  82 #define XFS_SB_VERSION2_RESERVED4BIT    0x00000004
  83 #define XFS_SB_VERSION2_ATTR2BIT        0x00000008      /* Inline attr rework */
  84 #define XFS_SB_VERSION2_PARENTBIT       0x00000010      /* parent pointers */
  85 #define XFS_SB_VERSION2_PROJID32BIT     0x00000080      /* 32 bit project id */
  86 #define XFS_SB_VERSION2_CRCBIT          0x00000100      /* metadata CRCs */
  87 #define XFS_SB_VERSION2_FTYPE           0x00000200      /* inode type in dir */
  88
  89 #define XFS_SB_VERSION2_OKREALFBITS     \
  90         (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
  91          XFS_SB_VERSION2_ATTR2BIT       | \
  92          XFS_SB_VERSION2_PROJID32BIT    | \
  93          XFS_SB_VERSION2_FTYPE)
  94 #define XFS_SB_VERSION2_OKSASHFBITS     \
  95         (0)
  96 #define XFS_SB_VERSION2_OKREALBITS      \
  97         (XFS_SB_VERSION2_OKREALFBITS |  \
  98          XFS_SB_VERSION2_OKSASHFBITS )
  99
 100 /*
 101  * Superblock - in core version.  Must match the ondisk version below.
 102  * Must be padded to 64 bit alignment.
 103  */
 104 typedef struct xfs_sb {
 105         __uint32_t      sb_magicnum;    /* magic number == XFS_SB_MAGIC */
 106         __uint32_t      sb_blocksize;   /* logical block size, bytes */
 107         xfs_drfsbno_t   sb_dblocks;     /* number of data blocks */
 108         xfs_drfsbno_t   sb_rblocks;     /* number of realtime blocks */
 109         xfs_drtbno_t    sb_rextents;    /* number of realtime extents */
 110         uuid_t          sb_uuid;        /* file system unique id */
 111         xfs_dfsbno_t    sb_logstart;    /* starting block of log if internal */
 112         xfs_ino_t       sb_rootino;     /* root inode number */
 113         xfs_ino_t       sb_rbmino;      /* bitmap inode for realtime extents */
 114         xfs_ino_t       sb_rsumino;     /* summary inode for rt bitmap */
 115         xfs_agblock_t   sb_rextsize;    /* realtime extent size, blocks */
 116         xfs_agblock_t   sb_agblocks;    /* size of an allocation group */
 117         xfs_agnumber_t  sb_agcount;     /* number of allocation groups */
 118         xfs_extlen_t    sb_rbmblocks;   /* number of rt bitmap blocks */
 119         xfs_extlen_t    sb_logblocks;   /* number of log blocks */
 120         __uint16_t      sb_versionnum;  /* header version == XFS_SB_VERSION */
 121         __uint16_t      sb_sectsize;    /* volume sector size, bytes */
 122         __uint16_t      sb_inodesize;   /* inode size, bytes */
 123         __uint16_t      sb_inopblock;   /* inodes per block */
 124         char            sb_fname[12];   /* file system name */
 125         __uint8_t       sb_blocklog;    /* log2 of sb_blocksize */
 126         __uint8_t       sb_sectlog;     /* log2 of sb_sectsize */
 127         __uint8_t       sb_inodelog;    /* log2 of sb_inodesize */
 128         __uint8_t       sb_inopblog;    /* log2 of sb_inopblock */
 129         __uint8_t       sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
 130         __uint8_t       sb_rextslog;    /* log2 of sb_rextents */
 131         __uint8_t       sb_inprogress;  /* mkfs is in progress, don't mount */
 132         __uint8_t       sb_imax_pct;    /* max % of fs for inode space */
 133                                         /* statistics */
 134         /*
 135          * These fields must remain contiguous.  If you really
 136          * want to change their layout, make sure you fix the
 137          * code in xfs_trans_apply_sb_deltas().
 138          */
 139         __uint64_t      sb_icount;      /* allocated inodes */
 140         __uint64_t      sb_ifree;       /* free inodes */
 141         __uint64_t      sb_fdblocks;    /* free data blocks */
 142         __uint64_t      sb_frextents;   /* free realtime extents */
 143         /*
 144          * End contiguous fields.
 145          */
 146         xfs_ino_t       sb_uquotino;    /* user quota inode */
 147         xfs_ino_t       sb_gquotino;    /* group quota inode */
 148         __uint16_t      sb_qflags;      /* quota flags */
 149         __uint8_t       sb_flags;       /* misc. flags */
 150         __uint8_t       sb_shared_vn;   /* shared version number */
 151         xfs_extlen_t    sb_inoalignmt;  /* inode chunk alignment, fsblocks */
 152         __uint32_t      sb_unit;        /* stripe or raid unit */
 153         __uint32_t      sb_width;       /* stripe or raid width */
 154         __uint8_t       sb_dirblklog;   /* log2 of dir block size (fsbs) */
 155         __uint8_t       sb_logsectlog;  /* log2 of the log sector size */
 156         __uint16_t      sb_logsectsize; /* sector size for the log, bytes */
 157         __uint32_t      sb_logsunit;    /* stripe unit size for the log */
 158         __uint32_t      sb_features2;   /* additional feature bits */
 159
 160         /*
 161          * bad features2 field as a result of failing to pad the sb
 162          * structure to 64 bits. Some machines will be using this field
 163          * for features2 bits. Easiest just to mark it bad and not use
 164          * it for anything else.
 165          */
 166         __uint32_t      sb_bad_features2;
 167
 168         /* version 5 superblock fields start here */
 169
 170         /* feature masks */
 171         __uint32_t      sb_features_compat;
 172         __uint32_t      sb_features_ro_compat;
 173         __uint32_t      sb_features_incompat;
 174         __uint32_t      sb_features_log_incompat;
 175
 176         __uint32_t      sb_crc;         /* superblock crc */
 177         __uint32_t      sb_pad;
 178
 179         xfs_ino_t       sb_pquotino;    /* project quota inode */
 180         xfs_lsn_t       sb_lsn;         /* last write sequence */
 181
 182         /* must be padded to 64 bit alignment */
 183 } xfs_sb_t;
 184
 185 #define XFS_SB_CRC_OFF          offsetof(struct xfs_sb, sb_crc)
 186
 187 /*
 188  * Superblock - on disk version.  Must match the in core version above.
 189  * Must be padded to 64 bit alignment.
 190  */
 191 typedef struct xfs_dsb {
 192         __be32          sb_magicnum;    /* magic number == XFS_SB_MAGIC */
 193         __be32          sb_blocksize;   /* logical block size, bytes */
 194         __be64          sb_dblocks;     /* number of data blocks */
 195         __be64          sb_rblocks;     /* number of realtime blocks */
 196         __be64          sb_rextents;    /* number of realtime extents */
 197         uuid_t          sb_uuid;        /* file system unique id */
 198         __be64          sb_logstart;    /* starting block of log if internal */
 199         __be64          sb_rootino;     /* root inode number */
 200         __be64          sb_rbmino;      /* bitmap inode for realtime extents */
 201         __be64          sb_rsumino;     /* summary inode for rt bitmap */
 202         __be32          sb_rextsize;    /* realtime extent size, blocks */
 203         __be32          sb_agblocks;    /* size of an allocation group */
 204         __be32          sb_agcount;     /* number of allocation groups */
 205         __be32          sb_rbmblocks;   /* number of rt bitmap blocks */
 206         __be32          sb_logblocks;   /* number of log blocks */
 207         __be16          sb_versionnum;  /* header version == XFS_SB_VERSION */
 208         __be16          sb_sectsize;    /* volume sector size, bytes */
 209         __be16          sb_inodesize;   /* inode size, bytes */
 210         __be16          sb_inopblock;   /* inodes per block */
 211         char            sb_fname[12];   /* file system name */
 212         __u8            sb_blocklog;    /* log2 of sb_blocksize */
 213         __u8            sb_sectlog;     /* log2 of sb_sectsize */
 214         __u8            sb_inodelog;    /* log2 of sb_inodesize */
 215         __u8            sb_inopblog;    /* log2 of sb_inopblock */
 216         __u8            sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
 217         __u8            sb_rextslog;    /* log2 of sb_rextents */
 218         __u8            sb_inprogress;  /* mkfs is in progress, don't mount */
 219         __u8            sb_imax_pct;    /* max % of fs for inode space */
 220                                         /* statistics */
 221         /*
 222          * These fields must remain contiguous.  If you really
 223          * want to change their layout, make sure you fix the
 224          * code in xfs_trans_apply_sb_deltas().
 225          */
 226         __be64          sb_icount;      /* allocated inodes */
 227         __be64          sb_ifree;       /* free inodes */
 228         __be64          sb_fdblocks;    /* free data blocks */
 229         __be64          sb_frextents;   /* free realtime extents */
 230         /*
 231          * End contiguous fields.
 232          */
 233         __be64          sb_uquotino;    /* user quota inode */
 234         __be64          sb_gquotino;    /* group quota inode */
 235         __be16          sb_qflags;      /* quota flags */
 236         __u8            sb_flags;       /* misc. flags */
 237         __u8            sb_shared_vn;   /* shared version number */
 238         __be32          sb_inoalignmt;  /* inode chunk alignment, fsblocks */
 239         __be32          sb_unit;        /* stripe or raid unit */
 240         __be32          sb_width;       /* stripe or raid width */
 241         __u8            sb_dirblklog;   /* log2 of dir block size (fsbs) */
 242         __u8            sb_logsectlog;  /* log2 of the log sector size */
 243         __be16          sb_logsectsize; /* sector size for the log, bytes */
 244         __be32          sb_logsunit;    /* stripe unit size for the log */
 245         __be32          sb_features2;   /* additional feature bits */
 246         /*
 247          * bad features2 field as a result of failing to pad the sb
 248          * structure to 64 bits. Some machines will be using this field
 249          * for features2 bits. Easiest just to mark it bad and not use
 250          * it for anything else.
 251          */
 252         __be32          sb_bad_features2;
 253
 254         /* version 5 superblock fields start here */
 255
 256         /* feature masks */
 257         __be32          sb_features_compat;
 258         __be32          sb_features_ro_compat;
 259         __be32          sb_features_incompat;
 260         __be32          sb_features_log_incompat;
 261
 262         __le32          sb_crc;         /* superblock crc */
 263         __be32          sb_pad;
 264
 265         __be64          sb_pquotino;    /* project quota inode */
 266         __be64          sb_lsn;         /* last write sequence */
 267
 268         /* must be padded to 64 bit alignment */
 269 } xfs_dsb_t;
 270
 271 /*
 272  * Sequence number values for the fields.
 273  */
 274 typedef enum {
 275         XFS_SBS_MAGICNUM, XFS_SBS_BLOCKSIZE, XFS_SBS_DBLOCKS, XFS_SBS_RBLOCKS,
 276         XFS_SBS_REXTENTS, XFS_SBS_UUID, XFS_SBS_LOGSTART, XFS_SBS_ROOTINO,
 277         XFS_SBS_RBMINO, XFS_SBS_RSUMINO, XFS_SBS_REXTSIZE, XFS_SBS_AGBLOCKS,
 278         XFS_SBS_AGCOUNT, XFS_SBS_RBMBLOCKS, XFS_SBS_LOGBLOCKS,
 279         XFS_SBS_VERSIONNUM, XFS_SBS_SECTSIZE, XFS_SBS_INODESIZE,
 280         XFS_SBS_INOPBLOCK, XFS_SBS_FNAME, XFS_SBS_BLOCKLOG,
 281         XFS_SBS_SECTLOG, XFS_SBS_INODELOG, XFS_SBS_INOPBLOG, XFS_SBS_AGBLKLOG,
 282         XFS_SBS_REXTSLOG, XFS_SBS_INPROGRESS, XFS_SBS_IMAX_PCT, XFS_SBS_ICOUNT,
 283         XFS_SBS_IFREE, XFS_SBS_FDBLOCKS, XFS_SBS_FREXTENTS, XFS_SBS_UQUOTINO,
 284         XFS_SBS_GQUOTINO, XFS_SBS_QFLAGS, XFS_SBS_FLAGS, XFS_SBS_SHARED_VN,
 285         XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG,
 286         XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT,
 287         XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2, XFS_SBS_FEATURES_COMPAT,
 288         XFS_SBS_FEATURES_RO_COMPAT, XFS_SBS_FEATURES_INCOMPAT,
 289         XFS_SBS_FEATURES_LOG_INCOMPAT, XFS_SBS_CRC, XFS_SBS_PAD,
 290         XFS_SBS_PQUOTINO, XFS_SBS_LSN,
 291         XFS_SBS_FIELDCOUNT
 292 } xfs_sb_field_t;
 293
 294 /*
 295  * Mask values, defined based on the xfs_sb_field_t values.
 296  * Only define the ones we're using.
 297  */
 298 #define XFS_SB_MVAL(x)          (1LL << XFS_SBS_ ## x)
 299 #define XFS_SB_UUID             XFS_SB_MVAL(UUID)
 300 #define XFS_SB_FNAME            XFS_SB_MVAL(FNAME)
 301 #define XFS_SB_ROOTINO          XFS_SB_MVAL(ROOTINO)
 302 #define XFS_SB_RBMINO           XFS_SB_MVAL(RBMINO)
 303 #define XFS_SB_RSUMINO          XFS_SB_MVAL(RSUMINO)
 304 #define XFS_SB_VERSIONNUM       XFS_SB_MVAL(VERSIONNUM)
 305 #define XFS_SB_UQUOTINO         XFS_SB_MVAL(UQUOTINO)
 306 #define XFS_SB_GQUOTINO         XFS_SB_MVAL(GQUOTINO)
 307 #define XFS_SB_QFLAGS           XFS_SB_MVAL(QFLAGS)
 308 #define XFS_SB_SHARED_VN        XFS_SB_MVAL(SHARED_VN)
 309 #define XFS_SB_UNIT             XFS_SB_MVAL(UNIT)
 310 #define XFS_SB_WIDTH            XFS_SB_MVAL(WIDTH)
 311 #define XFS_SB_ICOUNT           XFS_SB_MVAL(ICOUNT)
 312 #define XFS_SB_IFREE            XFS_SB_MVAL(IFREE)
 313 #define XFS_SB_FDBLOCKS         XFS_SB_MVAL(FDBLOCKS)
 314 #define XFS_SB_FEATURES2        XFS_SB_MVAL(FEATURES2)
 315 #define XFS_SB_BAD_FEATURES2    XFS_SB_MVAL(BAD_FEATURES2)
 316 #define XFS_SB_FEATURES_COMPAT  XFS_SB_MVAL(FEATURES_COMPAT)
 317 #define XFS_SB_FEATURES_RO_COMPAT XFS_SB_MVAL(FEATURES_RO_COMPAT)
 318 #define XFS_SB_FEATURES_INCOMPAT XFS_SB_MVAL(FEATURES_INCOMPAT)
 319 #define XFS_SB_FEATURES_LOG_INCOMPAT XFS_SB_MVAL(FEATURES_LOG_INCOMPAT)
 320 #define XFS_SB_CRC              XFS_SB_MVAL(CRC)
 321 #define XFS_SB_PQUOTINO         XFS_SB_MVAL(PQUOTINO)
 322 #define XFS_SB_NUM_BITS         ((int)XFS_SBS_FIELDCOUNT)
 323 #define XFS_SB_ALL_BITS         ((1LL << XFS_SB_NUM_BITS) - 1)
 324 #define XFS_SB_MOD_BITS         \
 325         (XFS_SB_UUID | XFS_SB_ROOTINO | XFS_SB_RBMINO | XFS_SB_RSUMINO | \
 326          XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO | XFS_SB_GQUOTINO | \
 327          XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \
 328          XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \
 329          XFS_SB_BAD_FEATURES2 | XFS_SB_FEATURES_COMPAT | \
 330          XFS_SB_FEATURES_RO_COMPAT | XFS_SB_FEATURES_INCOMPAT | \
 331          XFS_SB_FEATURES_LOG_INCOMPAT | XFS_SB_PQUOTINO)
 332
 333
 334 /*
 335  * Misc. Flags - warning - these will be cleared by xfs_repair unless
 336  * a feature bit is set when the flag is used.
 337  */
 338 #define XFS_SBF_NOFLAGS         0x00    /* no flags set */
 339 #define XFS_SBF_READONLY        0x01    /* only read-only mounts allowed */
 340
 341 /*
 342  * define max. shared version we can interoperate with
 343  */
 344 #define XFS_SB_MAX_SHARED_VN    0
 345
 346 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
 347
 348 static inline int xfs_sb_good_version(xfs_sb_t *sbp)
 349 {
 350         /* We always support version 1-3 */
 351         if (sbp->sb_versionnum >= XFS_SB_VERSION_1 &&
 352             sbp->sb_versionnum <= XFS_SB_VERSION_3)
 353                 return 1;
 354
 355         /* We support version 4 if all feature bits are supported */
 356         if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) {
 357                 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) ||
 358                     ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
 359                      (sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS)))
 360                         return 0;
 361
 362                 if (sbp->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
 363                         return 0;
 364                 return 1;
 365         }
 366         if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5)
 367                 return 1;
 368
 369         return 0;
 370 }
 371
 372 /*
 373  * Detect a mismatched features2 field.  Older kernels read/wrote
 374  * this into the wrong slot, so to be safe we keep them in sync.
 375  */
 376 static inline int xfs_sb_has_mismatched_features2(xfs_sb_t *sbp)
 377 {
 378         return (sbp->sb_bad_features2 != sbp->sb_features2);
 379 }
 380
 381 static inline unsigned xfs_sb_version_tonew(unsigned v)
 382 {
 383         if (v == XFS_SB_VERSION_1)
 384                 return XFS_SB_VERSION_4;
 385
 386         if (v == XFS_SB_VERSION_2)
 387                 return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
 388
 389         return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT |
 390                 XFS_SB_VERSION_NLINKBIT;
 391 }
 392
 393 static inline unsigned xfs_sb_version_toold(unsigned v)
 394 {
 395         if (v & (XFS_SB_VERSION_QUOTABIT | XFS_SB_VERSION_ALIGNBIT))
 396                 return 0;
 397         if (v & XFS_SB_VERSION_NLINKBIT)
 398                 return XFS_SB_VERSION_3;
 399         if (v & XFS_SB_VERSION_ATTRBIT)
 400                 return XFS_SB_VERSION_2;
 401         return XFS_SB_VERSION_1;
 402 }
 403
 404 static inline int xfs_sb_version_hasattr(xfs_sb_t *sbp)
 405 {
 406         return sbp->sb_versionnum == XFS_SB_VERSION_2 ||
 407                 sbp->sb_versionnum == XFS_SB_VERSION_3 ||
 408                 (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 409                  (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT));
 410 }
 411
 412 static inline void xfs_sb_version_addattr(xfs_sb_t *sbp)
 413 {
 414         if (sbp->sb_versionnum == XFS_SB_VERSION_1)
 415                 sbp->sb_versionnum = XFS_SB_VERSION_2;
 416         else if (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4)
 417                 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
 418         else
 419                 sbp->sb_versionnum = XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
 420 }
 421
 422 static inline int xfs_sb_version_hasnlink(xfs_sb_t *sbp)
 423 {
 424         return sbp->sb_versionnum == XFS_SB_VERSION_3 ||
 425                  (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 426                   (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT));
 427 }
 428
 429 static inline void xfs_sb_version_addnlink(xfs_sb_t *sbp)
 430 {
 431         if (sbp->sb_versionnum <= XFS_SB_VERSION_2)
 432                 sbp->sb_versionnum = XFS_SB_VERSION_3;
 433         else
 434                 sbp->sb_versionnum |= XFS_SB_VERSION_NLINKBIT;
 435 }
 436
 437 static inline int xfs_sb_version_hasquota(xfs_sb_t *sbp)
 438 {
 439         return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 440                 (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
 441 }
 442
 443 static inline void xfs_sb_version_addquota(xfs_sb_t *sbp)
 444 {
 445         if (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4)
 446                 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
 447         else
 448                 sbp->sb_versionnum = xfs_sb_version_tonew(sbp->sb_versionnum) |
 449                                         XFS_SB_VERSION_QUOTABIT;
 450 }
 451
 452 static inline int xfs_sb_version_hasalign(xfs_sb_t *sbp)
 453 {
 454         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 455                (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 456                 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT));
 457 }
 458
 459 static inline int xfs_sb_version_hasdalign(xfs_sb_t *sbp)
 460 {
 461         return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 462                 (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
 463 }
 464
 465 static inline int xfs_sb_version_hasshared(xfs_sb_t *sbp)
 466 {
 467         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 468                 (sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT);
 469 }
 470
 471 static inline int xfs_sb_version_hasdirv2(xfs_sb_t *sbp)
 472 {
 473         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 474                (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 475                 (sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT));
 476 }
 477
 478 static inline int xfs_sb_version_haslogv2(xfs_sb_t *sbp)
 479 {
 480         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 481                (XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 482                 (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT));
 483 }
 484
 485 static inline int xfs_sb_version_hasextflgbit(xfs_sb_t *sbp)
 486 {
 487         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 488                (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 489                 (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT));
 490 }
 491
 492 static inline int xfs_sb_version_hassector(xfs_sb_t *sbp)
 493 {
 494         return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 495                 (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
 496 }
 497
 498 static inline int xfs_sb_version_hasasciici(xfs_sb_t *sbp)
 499 {
 500         return XFS_SB_VERSION_NUM(sbp) >= XFS_SB_VERSION_4 &&
 501                 (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
 502 }
 503
 504 static inline int xfs_sb_version_hasmorebits(xfs_sb_t *sbp)
 505 {
 506         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 507                (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 508                 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT));
 509 }
 510
 511 /*
 512  * sb_features2 bit version macros.
 513  *
 514  * For example, for a bit defined as XFS_SB_VERSION2_FUNBIT, has a macro:
 515  *
 516  * SB_VERSION_HASFUNBIT(xfs_sb_t *sbp)
 517  *      ((xfs_sb_version_hasmorebits(sbp) &&
 518  *       ((sbp)->sb_features2 & XFS_SB_VERSION2_FUNBIT)
 519  */
 520
 521 static inline int xfs_sb_version_haslazysbcount(xfs_sb_t *sbp)
 522 {
 523         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 524                (xfs_sb_version_hasmorebits(sbp) &&
 525                 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT));
 526 }
 527
 528 static inline int xfs_sb_version_hasattr2(xfs_sb_t *sbp)
 529 {
 530         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 531                (xfs_sb_version_hasmorebits(sbp) &&
 532                 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT));
 533 }
 534
 535 static inline void xfs_sb_version_addattr2(xfs_sb_t *sbp)
 536 {
 537         sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
 538         sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
 539 }
 540
 541 static inline void xfs_sb_version_removeattr2(xfs_sb_t *sbp)
 542 {
 543         sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
 544         if (!sbp->sb_features2)
 545                 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
 546 }
 547
 548 static inline int xfs_sb_version_hasprojid32bit(xfs_sb_t *sbp)
 549 {
 550         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 551                (xfs_sb_version_hasmorebits(sbp) &&
 552                 (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT));
 553 }
 554
 555 static inline void xfs_sb_version_addprojid32bit(xfs_sb_t *sbp)
 556 {
 557         sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
 558         sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT;
 559         sbp->sb_bad_features2 |= XFS_SB_VERSION2_PROJID32BIT;
 560 }
 561
 562 /*
 563  * Extended v5 superblock feature masks. These are to be used for new v5
 564  * superblock features only.
 565  *
 566  * Compat features are new features that old kernels will not notice or affect
 567  * and so can mount read-write without issues.
 568  *
 569  * RO-Compat (read only) are features that old kernels can read but will break
 570  * if they write. Hence only read-only mounts of such filesystems are allowed on
 571  * kernels that don't support the feature bit.
 572  *
 573  * InCompat features are features which old kernels will not understand and so
 574  * must not mount.
 575  *
 576  * Log-InCompat features are for changes to log formats or new transactions that
 577  * can't be replayed on older kernels. The fields are set when the filesystem is
 578  * mounted, and a clean unmount clears the fields.
 579  */
 580 #define XFS_SB_FEAT_COMPAT_ALL 0
 581 #define XFS_SB_FEAT_COMPAT_UNKNOWN      ~XFS_SB_FEAT_COMPAT_ALL
 582 static inline bool
 583 xfs_sb_has_compat_feature(
 584         struct xfs_sb   *sbp,
 585         __uint32_t      feature)
 586 {
 587         return (sbp->sb_features_compat & feature) != 0;
 588 }
 589
 590 #define XFS_SB_FEAT_RO_COMPAT_ALL 0
 591 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN   ~XFS_SB_FEAT_RO_COMPAT_ALL
 592 static inline bool
 593 xfs_sb_has_ro_compat_feature(
 594         struct xfs_sb   *sbp,
 595         __uint32_t      feature)
 596 {
 597         return (sbp->sb_features_ro_compat & feature) != 0;
 598 }
 599
 600 #define XFS_SB_FEAT_INCOMPAT_FTYPE      (1 << 0)        /* filetype in dirent */
 601 #define XFS_SB_FEAT_INCOMPAT_ALL \
 602                 (XFS_SB_FEAT_INCOMPAT_FTYPE)
 603
 604 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN    ~XFS_SB_FEAT_INCOMPAT_ALL
 605 static inline bool
 606 xfs_sb_has_incompat_feature(
 607         struct xfs_sb   *sbp,
 608         __uint32_t      feature)
 609 {
 610         return (sbp->sb_features_incompat & feature) != 0;
 611 }
 612
 613 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
 614 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN        ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
 615 static inline bool
 616 xfs_sb_has_incompat_log_feature(
 617         struct xfs_sb   *sbp,
 618         __uint32_t      feature)
 619 {
 620         return (sbp->sb_features_log_incompat & feature) != 0;
 621 }
 622
 623 /*
 624  * V5 superblock specific feature checks
 625  */
 626 static inline int xfs_sb_version_hascrc(xfs_sb_t *sbp)
 627 {
 628         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
 629 }
 630
 631 static inline int xfs_sb_version_has_pquotino(xfs_sb_t *sbp)
 632 {
 633         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
 634 }
 635
 636 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp)
 637 {
 638         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
 639                 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) ||
 640                (xfs_sb_version_hasmorebits(sbp) &&
 641                  (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE));
 642 }
 643
 644 /*
 645  * end of superblock version macros
 646  */
 647
 648 static inline bool
 649 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
 650 {
 651         return (ino == sbp->sb_uquotino ||
 652                 ino == sbp->sb_gquotino ||
 653                 ino == sbp->sb_pquotino);
 654 }
 655
 656 #define XFS_SB_DADDR            ((xfs_daddr_t)0) /* daddr in filesystem/ag */
 657 #define XFS_SB_BLOCK(mp)        XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
 658 #define XFS_BUF_TO_SBP(bp)      ((xfs_dsb_t *)((bp)->b_addr))
 659
 660 #define XFS_HDR_BLOCK(mp,d)     ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
 661 #define XFS_DADDR_TO_FSB(mp,d)  XFS_AGB_TO_FSB(mp, \
 662                         xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
 663 #define XFS_FSB_TO_DADDR(mp,fsbno)      XFS_AGB_TO_DADDR(mp, \
 664                         XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
 665
 666 /*
 667  * File system sector to basic block conversions.
 668  */
 669 #define XFS_FSS_TO_BB(mp,sec)   ((sec) << (mp)->m_sectbb_log)
 670
 671 /*
 672  * File system block to basic block conversions.
 673  */
 674 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
 675 #define XFS_BB_TO_FSB(mp,bb)    \
 676         (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
 677 #define XFS_BB_TO_FSBT(mp,bb)   ((bb) >> (mp)->m_blkbb_log)
 678
 679 /*
 680  * File system block to byte conversions.
 681  */
 682 #define XFS_FSB_TO_B(mp,fsbno)  ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
 683 #define XFS_B_TO_FSB(mp,b)      \
 684         ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
 685 #define XFS_B_TO_FSBT(mp,b)     (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
 686 #define XFS_B_FSB_OFFSET(mp,b)  ((b) & (mp)->m_blockmask)
 687
 688 /*
 689  * perag get/put wrappers for ref counting
 690  */
 691 extern struct xfs_perag *xfs_perag_get(struct xfs_mount *, xfs_agnumber_t);
 692 extern struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *, xfs_agnumber_t,
 693                                            int tag);
 694 extern void     xfs_perag_put(struct xfs_perag *pag);
 695 extern int      xfs_initialize_perag_data(struct xfs_mount *, xfs_agnumber_t);
 696
 697 extern void     xfs_sb_calc_crc(struct xfs_buf  *);
 698 extern void     xfs_mod_sb(struct xfs_trans *, __int64_t);
 699 extern void     xfs_sb_mount_common(struct xfs_mount *, struct xfs_sb *);
 700 extern void     xfs_sb_from_disk(struct xfs_sb *, struct xfs_dsb *);
 701 extern void     xfs_sb_to_disk(struct xfs_dsb *, struct xfs_sb *, __int64_t);
 702 extern void     xfs_sb_quota_from_disk(struct xfs_sb *sbp);
 703
 704 #endif  /* __XFS_SB_H__ */