1 /* 2 * Taken from Linux kernel tree (linux/fs/xfs) 3 * 4 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 5 * All Rights Reserved. 6 * 7 * Copyright (c) 2012 Paulo Alcantara <pcacjr@zytor.com> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it would be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write the Free Software Foundation, 20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 #ifndef XFS_SB_H_ 23 #define XFS_SB_H_ 24 25 #include <stddef.h> 26 27 #include <sys/types.h> 28 29 typedef unsigned char uuid_t[16]; 30 31 /* 32 * Super block 33 * Fits into a sector-sized buffer at address 0 of each allocation group. 34 * Only the first of these is ever updated except during growfs. 35 */ 36 37 struct xfs_buf; 38 struct xfs_mount; 39 40 #define XFS_SB_MAGIC "XFSB" /* 'XFSB' */ 41 #define XFS_SB_VERSION_1 1 /* 5.3, 6.0.1, 6.1 */ 42 #define XFS_SB_VERSION_2 2 /* 6.2 - attributes */ 43 #define XFS_SB_VERSION_3 3 /* 6.2 - new inode version */ 44 #define XFS_SB_VERSION_4 4 /* 6.2+ - bitmask version */ 45 #define XFS_SB_VERSION_NUMBITS 0x000f 46 #define XFS_SB_VERSION_ALLFBITS 0xfff0 47 #define XFS_SB_VERSION_SASHFBITS 0xf000 48 #define XFS_SB_VERSION_REALFBITS 0x0ff0 49 #define XFS_SB_VERSION_ATTRBIT 0x0010 50 #define XFS_SB_VERSION_NLINKBIT 0x0020 51 #define XFS_SB_VERSION_QUOTABIT 0x0040 52 #define XFS_SB_VERSION_ALIGNBIT 0x0080 53 #define XFS_SB_VERSION_DALIGNBIT 0x0100 54 #define XFS_SB_VERSION_SHAREDBIT 0x0200 55 #define XFS_SB_VERSION_LOGV2BIT 0x0400 56 #define XFS_SB_VERSION_SECTORBIT 0x0800 57 #define XFS_SB_VERSION_EXTFLGBIT 0x1000 58 #define XFS_SB_VERSION_DIRV2BIT 0x2000 59 #define XFS_SB_VERSION_BORGBIT 0x4000 /* ASCII only case-insens. */ 60 #define XFS_SB_VERSION_MOREBITSBIT 0x8000 61 #define XFS_SB_VERSION_OKSASHFBITS \ 62 (XFS_SB_VERSION_EXTFLGBIT | \ 63 XFS_SB_VERSION_DIRV2BIT | \ 64 XFS_SB_VERSION_BORGBIT) 65 #define XFS_SB_VERSION_OKREALFBITS \ 66 (XFS_SB_VERSION_ATTRBIT | \ 67 XFS_SB_VERSION_NLINKBIT | \ 68 XFS_SB_VERSION_QUOTABIT | \ 69 XFS_SB_VERSION_ALIGNBIT | \ 70 XFS_SB_VERSION_DALIGNBIT | \ 71 XFS_SB_VERSION_SHAREDBIT | \ 72 XFS_SB_VERSION_LOGV2BIT | \ 73 XFS_SB_VERSION_SECTORBIT | \ 74 XFS_SB_VERSION_MOREBITSBIT) 75 #define XFS_SB_VERSION_OKREALBITS \ 76 (XFS_SB_VERSION_NUMBITS | \ 77 XFS_SB_VERSION_OKREALFBITS | \ 78 XFS_SB_VERSION_OKSASHFBITS) 79 80 /* 81 * There are two words to hold XFS "feature" bits: the original 82 * word, sb_versionnum, and sb_features2. Whenever a bit is set in 83 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set. 84 * 85 * These defines represent bits in sb_features2. 86 */ 87 #define XFS_SB_VERSION2_REALFBITS 0x00ffffff /* Mask: features */ 88 #define XFS_SB_VERSION2_RESERVED1BIT 0x00000001 89 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */ 90 #define XFS_SB_VERSION2_RESERVED4BIT 0x00000004 91 #define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */ 92 #define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */ 93 #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */ 94 95 #define XFS_SB_VERSION2_OKREALFBITS \ 96 (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \ 97 XFS_SB_VERSION2_ATTR2BIT | \ 98 XFS_SB_VERSION2_PROJID32BIT) 99 #define XFS_SB_VERSION2_OKSASHFBITS \ 100 (0) 101 #define XFS_SB_VERSION2_OKREALBITS \ 102 (XFS_SB_VERSION2_OKREALFBITS | \ 103 XFS_SB_VERSION2_OKSASHFBITS ) 104 105 /* 106 * Sequence number values for the fields. 107 */ 108 typedef enum { 109 XFS_SBS_MAGICNUM, XFS_SBS_BLOCKSIZE, XFS_SBS_DBLOCKS, XFS_SBS_RBLOCKS, 110 XFS_SBS_REXTENTS, XFS_SBS_UUID, XFS_SBS_LOGSTART, XFS_SBS_ROOTINO, 111 XFS_SBS_RBMINO, XFS_SBS_RSUMINO, XFS_SBS_REXTSIZE, XFS_SBS_AGBLOCKS, 112 XFS_SBS_AGCOUNT, XFS_SBS_RBMBLOCKS, XFS_SBS_LOGBLOCKS, 113 XFS_SBS_VERSIONNUM, XFS_SBS_SECTSIZE, XFS_SBS_INODESIZE, 114 XFS_SBS_INOPBLOCK, XFS_SBS_FNAME, XFS_SBS_BLOCKLOG, 115 XFS_SBS_SECTLOG, XFS_SBS_INODELOG, XFS_SBS_INOPBLOG, XFS_SBS_AGBLKLOG, 116 XFS_SBS_REXTSLOG, XFS_SBS_INPROGRESS, XFS_SBS_IMAX_PCT, XFS_SBS_ICOUNT, 117 XFS_SBS_IFREE, XFS_SBS_FDBLOCKS, XFS_SBS_FREXTENTS, XFS_SBS_UQUOTINO, 118 XFS_SBS_GQUOTINO, XFS_SBS_QFLAGS, XFS_SBS_FLAGS, XFS_SBS_SHARED_VN, 119 XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG, 120 XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT, 121 XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2, 122 XFS_SBS_FIELDCOUNT 123 } xfs_sb_field_t; 124 125 /* 126 * Mask values, defined based on the xfs_sb_field_t values. 127 * Only define the ones we're using. 128 */ 129 #define XFS_SB_MVAL(x) (1LL << XFS_SBS_ ## x) 130 #define XFS_SB_UUID XFS_SB_MVAL(UUID) 131 #define XFS_SB_FNAME XFS_SB_MVAL(FNAME) 132 #define XFS_SB_ROOTINO XFS_SB_MVAL(ROOTINO) 133 #define XFS_SB_RBMINO XFS_SB_MVAL(RBMINO) 134 #define XFS_SB_RSUMINO XFS_SB_MVAL(RSUMINO) 135 #define XFS_SB_VERSIONNUM XFS_SB_MVAL(VERSIONNUM) 136 #define XFS_SB_UQUOTINO XFS_SB_MVAL(UQUOTINO) 137 #define XFS_SB_GQUOTINO XFS_SB_MVAL(GQUOTINO) 138 #define XFS_SB_QFLAGS XFS_SB_MVAL(QFLAGS) 139 #define XFS_SB_SHARED_VN XFS_SB_MVAL(SHARED_VN) 140 #define XFS_SB_UNIT XFS_SB_MVAL(UNIT) 141 #define XFS_SB_WIDTH XFS_SB_MVAL(WIDTH) 142 #define XFS_SB_ICOUNT XFS_SB_MVAL(ICOUNT) 143 #define XFS_SB_IFREE XFS_SB_MVAL(IFREE) 144 #define XFS_SB_FDBLOCKS XFS_SB_MVAL(FDBLOCKS) 145 #define XFS_SB_FEATURES2 XFS_SB_MVAL(FEATURES2) 146 #define XFS_SB_BAD_FEATURES2 XFS_SB_MVAL(BAD_FEATURES2) 147 #define XFS_SB_NUM_BITS ((int)XFS_SBS_FIELDCOUNT) 148 #define XFS_SB_ALL_BITS ((1LL << XFS_SB_NUM_BITS) - 1) 149 #define XFS_SB_MOD_BITS \ 150 (XFS_SB_UUID | XFS_SB_ROOTINO | XFS_SB_RBMINO | XFS_SB_RSUMINO | \ 151 XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO | XFS_SB_GQUOTINO | \ 152 XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \ 153 XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \ 154 XFS_SB_BAD_FEATURES2) 155 156 157 /* 158 * Misc. Flags - warning - these will be cleared by xfs_repair unless 159 * a feature bit is set when the flag is used. 160 */ 161 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */ 162 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */ 163 164 /* 165 * define max. shared version we can interoperate with 166 */ 167 #define XFS_SB_MAX_SHARED_VN 0 168 169 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS) 170 171 /* 172 * end of superblock version macros 173 */ 174 175 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR) 176 #define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr)) 177 178 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d)) 179 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \ 180 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d)) 181 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \ 182 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno)) 183 184 /* 185 * File system sector to basic block conversions. 186 */ 187 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log) 188 189 /* 190 * File system block to basic block conversions. 191 */ 192 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log) 193 #define XFS_BB_TO_FSB(mp,bb) \ 194 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log) 195 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log) 196 197 /* 198 * File system block to byte conversions. 199 */ 200 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog) 201 #define XFS_B_TO_FSB(mp,b) \ 202 ((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog) 203 #define XFS_B_TO_FSBT(mp,b) (((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog) 204 #define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask) 205 206 #endif /* XFS_SB_H_ */ 207