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/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __XFS_SB_H__
#define __XFS_SB_H__
/*
* Super block
* Fits into a sector-sized buffer at address 0 of each allocation group.
* Only the first of these is ever updated except during growfs.
*/
struct xfs_buf;
struct xfs_mount;
#define XFS_SB_MAGIC 0x58465342 /* 'XFSB' */
#define XFS_SB_VERSION_1 1 /* 5.3, 6.0.1, 6.1 */
#define XFS_SB_VERSION_2 2 /* 6.2 - attributes */
#define XFS_SB_VERSION_3 3 /* 6.2 - new inode version */
#define XFS_SB_VERSION_4 4 /* 6.2+ - bitmask version */
#define XFS_SB_VERSION_NUMBITS 0x000f
#define XFS_SB_VERSION_ALLFBITS 0xfff0
#define XFS_SB_VERSION_SASHFBITS 0xf000
#define XFS_SB_VERSION_REALFBITS 0x0ff0
#define XFS_SB_VERSION_ATTRBIT 0x0010
#define XFS_SB_VERSION_NLINKBIT 0x0020
#define XFS_SB_VERSION_QUOTABIT 0x0040
#define XFS_SB_VERSION_ALIGNBIT 0x0080
#define XFS_SB_VERSION_DALIGNBIT 0x0100
#define XFS_SB_VERSION_SHAREDBIT 0x0200
#define XFS_SB_VERSION_LOGV2BIT 0x0400
#define XFS_SB_VERSION_SECTORBIT 0x0800
#define XFS_SB_VERSION_EXTFLGBIT 0x1000
#define XFS_SB_VERSION_DIRV2BIT 0x2000
#define XFS_SB_VERSION_MOREBITSBIT 0x8000
#define XFS_SB_VERSION_OKSASHFBITS \
(XFS_SB_VERSION_EXTFLGBIT | \
XFS_SB_VERSION_DIRV2BIT)
#define XFS_SB_VERSION_OKREALFBITS \
(XFS_SB_VERSION_ATTRBIT | \
XFS_SB_VERSION_NLINKBIT | \
XFS_SB_VERSION_QUOTABIT | \
XFS_SB_VERSION_ALIGNBIT | \
XFS_SB_VERSION_DALIGNBIT | \
XFS_SB_VERSION_SHAREDBIT | \
XFS_SB_VERSION_LOGV2BIT | \
XFS_SB_VERSION_SECTORBIT | \
XFS_SB_VERSION_MOREBITSBIT)
#define XFS_SB_VERSION_OKREALBITS \
(XFS_SB_VERSION_NUMBITS | \
XFS_SB_VERSION_OKREALFBITS | \
XFS_SB_VERSION_OKSASHFBITS)
/*
* There are two words to hold XFS "feature" bits: the original
* word, sb_versionnum, and sb_features2. Whenever a bit is set in
* sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
*
* These defines represent bits in sb_features2.
*/
#define XFS_SB_VERSION2_REALFBITS 0x00ffffff /* Mask: features */
#define XFS_SB_VERSION2_RESERVED1BIT 0x00000001
#define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */
#define XFS_SB_VERSION2_RESERVED4BIT 0x00000004
#define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */
#define XFS_SB_VERSION2_OKREALFBITS \
(XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
XFS_SB_VERSION2_ATTR2BIT)
#define XFS_SB_VERSION2_OKSASHFBITS \
(0)
#define XFS_SB_VERSION2_OKREALBITS \
(XFS_SB_VERSION2_OKREALFBITS | \
XFS_SB_VERSION2_OKSASHFBITS )
/*
* Superblock - in core version. Must match the ondisk version below.
* Must be padded to 64 bit alignment.
*/
typedef struct xfs_sb {
__uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */
__uint32_t sb_blocksize; /* logical block size, bytes */
xfs_drfsbno_t sb_dblocks; /* number of data blocks */
xfs_drfsbno_t sb_rblocks; /* number of realtime blocks */
xfs_drtbno_t sb_rextents; /* number of realtime extents */
uuid_t sb_uuid; /* file system unique id */
xfs_dfsbno_t sb_logstart; /* starting block of log if internal */
xfs_ino_t sb_rootino; /* root inode number */
xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */
xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */
xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */
xfs_agblock_t sb_agblocks; /* size of an allocation group */
xfs_agnumber_t sb_agcount; /* number of allocation groups */
xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */
xfs_extlen_t sb_logblocks; /* number of log blocks */
__uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */
__uint16_t sb_sectsize; /* volume sector size, bytes */
__uint16_t sb_inodesize; /* inode size, bytes */
__uint16_t sb_inopblock; /* inodes per block */
char sb_fname[12]; /* file system name */
__uint8_t sb_blocklog; /* log2 of sb_blocksize */
__uint8_t sb_sectlog; /* log2 of sb_sectsize */
__uint8_t sb_inodelog; /* log2 of sb_inodesize */
__uint8_t sb_inopblog; /* log2 of sb_inopblock */
__uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */
__uint8_t sb_rextslog; /* log2 of sb_rextents */
__uint8_t sb_inprogress; /* mkfs is in progress, don't mount */
__uint8_t sb_imax_pct; /* max % of fs for inode space */
/* statistics */
/*
* These fields must remain contiguous. If you really
* want to change their layout, make sure you fix the
* code in xfs_trans_apply_sb_deltas().
*/
__uint64_t sb_icount; /* allocated inodes */
__uint64_t sb_ifree; /* free inodes */
__uint64_t sb_fdblocks; /* free data blocks */
__uint64_t sb_frextents; /* free realtime extents */
/*
* End contiguous fields.
*/
xfs_ino_t sb_uquotino; /* user quota inode */
xfs_ino_t sb_gquotino; /* group quota inode */
__uint16_t sb_qflags; /* quota flags */
__uint8_t sb_flags; /* misc. flags */
__uint8_t sb_shared_vn; /* shared version number */
xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */
__uint32_t sb_unit; /* stripe or raid unit */
__uint32_t sb_width; /* stripe or raid width */
__uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */
__uint8_t sb_logsectlog; /* log2 of the log sector size */
__uint16_t sb_logsectsize; /* sector size for the log, bytes */
__uint32_t sb_logsunit; /* stripe unit size for the log */
__uint32_t sb_features2; /* additional feature bits */
/*
* bad features2 field as a result of failing to pad the sb
* structure to 64 bits. Some machines will be using this field
* for features2 bits. Easiest just to mark it bad and not use
* it for anything else.
*/
__uint32_t sb_bad_features2;
/* must be padded to 64 bit alignment */
} xfs_sb_t;
/*
* Superblock - on disk version. Must match the in core version above.
* Must be padded to 64 bit alignment.
*/
typedef struct xfs_dsb {
__be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */
__be32 sb_blocksize; /* logical block size, bytes */
__be64 sb_dblocks; /* number of data blocks */
__be64 sb_rblocks; /* number of realtime blocks */
__be64 sb_rextents; /* number of realtime extents */
uuid_t sb_uuid; /* file system unique id */
__be64 sb_logstart; /* starting block of log if internal */
__be64 sb_rootino; /* root inode number */
__be64 sb_rbmino; /* bitmap inode for realtime extents */
__be64 sb_rsumino; /* summary inode for rt bitmap */
__be32 sb_rextsize; /* realtime extent size, blocks */
__be32 sb_agblocks; /* size of an allocation group */
__be32 sb_agcount; /* number of allocation groups */
__be32 sb_rbmblocks; /* number of rt bitmap blocks */
__be32 sb_logblocks; /* number of log blocks */
__be16 sb_versionnum; /* header version == XFS_SB_VERSION */
__be16 sb_sectsize; /* volume sector size, bytes */
__be16 sb_inodesize; /* inode size, bytes */
__be16 sb_inopblock; /* inodes per block */
char sb_fname[12]; /* file system name */
__u8 sb_blocklog; /* log2 of sb_blocksize */
__u8 sb_sectlog; /* log2 of sb_sectsize */
__u8 sb_inodelog; /* log2 of sb_inodesize */
__u8 sb_inopblog; /* log2 of sb_inopblock */
__u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */
__u8 sb_rextslog; /* log2 of sb_rextents */
__u8 sb_inprogress; /* mkfs is in progress, don't mount */
__u8 sb_imax_pct; /* max % of fs for inode space */
/* statistics */
/*
* These fields must remain contiguous. If you really
* want to change their layout, make sure you fix the
* code in xfs_trans_apply_sb_deltas().
*/
__be64 sb_icount; /* allocated inodes */
__be64 sb_ifree; /* free inodes */
__be64 sb_fdblocks; /* free data blocks */
__be64 sb_frextents; /* free realtime extents */
/*
* End contiguous fields.
*/
__be64 sb_uquotino; /* user quota inode */
__be64 sb_gquotino; /* group quota inode */
__be16 sb_qflags; /* quota flags */
__u8 sb_flags; /* misc. flags */
__u8 sb_shared_vn; /* shared version number */
__be32 sb_inoalignmt; /* inode chunk alignment, fsblocks */
__be32 sb_unit; /* stripe or raid unit */
__be32 sb_width; /* stripe or raid width */
__u8 sb_dirblklog; /* log2 of dir block size (fsbs) */
__u8 sb_logsectlog; /* log2 of the log sector size */
__be16 sb_logsectsize; /* sector size for the log, bytes */
__be32 sb_logsunit; /* stripe unit size for the log */
__be32 sb_features2; /* additional feature bits */
/*
* bad features2 field as a result of failing to pad the sb
* structure to 64 bits. Some machines will be using this field
* for features2 bits. Easiest just to mark it bad and not use
* it for anything else.
*/
__be32 sb_bad_features2;
/* must be padded to 64 bit alignment */
} xfs_dsb_t;
/*
* Sequence number values for the fields.
*/
typedef enum {
XFS_SBS_MAGICNUM, XFS_SBS_BLOCKSIZE, XFS_SBS_DBLOCKS, XFS_SBS_RBLOCKS,
XFS_SBS_REXTENTS, XFS_SBS_UUID, XFS_SBS_LOGSTART, XFS_SBS_ROOTINO,
XFS_SBS_RBMINO, XFS_SBS_RSUMINO, XFS_SBS_REXTSIZE, XFS_SBS_AGBLOCKS,
XFS_SBS_AGCOUNT, XFS_SBS_RBMBLOCKS, XFS_SBS_LOGBLOCKS,
XFS_SBS_VERSIONNUM, XFS_SBS_SECTSIZE, XFS_SBS_INODESIZE,
XFS_SBS_INOPBLOCK, XFS_SBS_FNAME, XFS_SBS_BLOCKLOG,
XFS_SBS_SECTLOG, XFS_SBS_INODELOG, XFS_SBS_INOPBLOG, XFS_SBS_AGBLKLOG,
XFS_SBS_REXTSLOG, XFS_SBS_INPROGRESS, XFS_SBS_IMAX_PCT, XFS_SBS_ICOUNT,
XFS_SBS_IFREE, XFS_SBS_FDBLOCKS, XFS_SBS_FREXTENTS, XFS_SBS_UQUOTINO,
XFS_SBS_GQUOTINO, XFS_SBS_QFLAGS, XFS_SBS_FLAGS, XFS_SBS_SHARED_VN,
XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG,
XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT,
XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2,
XFS_SBS_FIELDCOUNT
} xfs_sb_field_t;
/*
* Mask values, defined based on the xfs_sb_field_t values.
* Only define the ones we're using.
*/
#define XFS_SB_MVAL(x) (1LL << XFS_SBS_ ## x)
#define XFS_SB_UUID XFS_SB_MVAL(UUID)
#define XFS_SB_FNAME XFS_SB_MVAL(FNAME)
#define XFS_SB_ROOTINO XFS_SB_MVAL(ROOTINO)
#define XFS_SB_RBMINO XFS_SB_MVAL(RBMINO)
#define XFS_SB_RSUMINO XFS_SB_MVAL(RSUMINO)
#define XFS_SB_VERSIONNUM XFS_SB_MVAL(VERSIONNUM)
#define XFS_SB_UQUOTINO XFS_SB_MVAL(UQUOTINO)
#define XFS_SB_GQUOTINO XFS_SB_MVAL(GQUOTINO)
#define XFS_SB_QFLAGS XFS_SB_MVAL(QFLAGS)
#define XFS_SB_SHARED_VN XFS_SB_MVAL(SHARED_VN)
#define XFS_SB_UNIT XFS_SB_MVAL(UNIT)
#define XFS_SB_WIDTH XFS_SB_MVAL(WIDTH)
#define XFS_SB_ICOUNT XFS_SB_MVAL(ICOUNT)
#define XFS_SB_IFREE XFS_SB_MVAL(IFREE)
#define XFS_SB_FDBLOCKS XFS_SB_MVAL(FDBLOCKS)
#define XFS_SB_FEATURES2 XFS_SB_MVAL(FEATURES2)
#define XFS_SB_BAD_FEATURES2 XFS_SB_MVAL(BAD_FEATURES2)
#define XFS_SB_NUM_BITS ((int)XFS_SBS_FIELDCOUNT)
#define XFS_SB_ALL_BITS ((1LL << XFS_SB_NUM_BITS) - 1)
#define XFS_SB_MOD_BITS \
(XFS_SB_UUID | XFS_SB_ROOTINO | XFS_SB_RBMINO | XFS_SB_RSUMINO | \
XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO | XFS_SB_GQUOTINO | \
XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \
XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \
XFS_SB_BAD_FEATURES2)
/*
* Misc. Flags - warning - these will be cleared by xfs_repair unless
* a feature bit is set when the flag is used.
*/
#define XFS_SBF_NOFLAGS 0x00 /* no flags set */
#define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */
/*
* define max. shared version we can interoperate with
*/
#define XFS_SB_MAX_SHARED_VN 0
#define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
#ifdef __KERNEL__
static inline int xfs_sb_good_version(xfs_sb_t *sbp)
{
return (((sbp->sb_versionnum >= XFS_SB_VERSION_1) && \
(sbp->sb_versionnum <= XFS_SB_VERSION_3)) || \
((XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
!((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) || \
((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && \
(sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS))) && \
(sbp->sb_shared_vn <= XFS_SB_MAX_SHARED_VN)));
}
#else
static inline int xfs_sb_good_version(xfs_sb_t *sbp)
{
return (((sbp->sb_versionnum >= XFS_SB_VERSION_1) && \
(sbp->sb_versionnum <= XFS_SB_VERSION_3)) ||
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