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linux_dsm_epyc7002/fs/xfs/libxfs/xfs_format.h
Christoph Hellwig daa79baefc xfs: remove suport for filesystems without unwritten extent flag 
The option to enable unwritten extents was made default in 2003,
removed from mkfs in 2007, and cannot be disabled in v5.  We also
rely on it for a lot of common functionality, so filesystems without
it will run a completely untested and buggy code path.  Enabling the
support also is a simple bit flip using xfs_db, so legacy file
systems can still be brought forward.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
2018-10-18 17:18:58 +11:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#ifndef __XFS_FORMAT_H__
#define __XFS_FORMAT_H__
/*
* XFS On Disk Format Definitions
*
* This header file defines all the on-disk format definitions for
* general XFS objects. Directory and attribute related objects are defined in
* xfs_da_format.h, which log and log item formats are defined in
* xfs_log_format.h. Everything else goes here.
*/
struct xfs_mount;
struct xfs_trans;
struct xfs_inode;
struct xfs_buf;
struct xfs_ifork;
/*
* 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.
*/
#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_5 5 /* CRC enabled filesystem */
#define XFS_SB_VERSION_NUMBITS 0x000f
#define XFS_SB_VERSION_ALLFBITS 0xfff0
#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_BORGBIT 0x4000 /* ASCII only case-insens. */
#define XFS_SB_VERSION_MOREBITSBIT 0x8000
/*
* The size of a single extended attribute on disk is limited by
* the size of index values within the attribute entries themselves.
* These are be16 fields, so we can only support attribute data
* sizes up to 2^16 bytes in length.
*/
#define XFS_XATTR_SIZE_MAX (1 << 16)
/*
* Supported feature bit list is just all bits in the versionnum field because
* we've used them all up and understand them all. Except, of course, for the
* shared superblock bit, which nobody knows what it does and so is unsupported.
*/
#define XFS_SB_VERSION_OKBITS \
((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \
~XFS_SB_VERSION_SHAREDBIT)
/*
* 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_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_PARENTBIT 0x00000010 /* parent pointers */
#define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */
#define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */
#define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */
#define XFS_SB_VERSION2_OKBITS \
(XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
XFS_SB_VERSION2_ATTR2BIT | \
XFS_SB_VERSION2_PROJID32BIT | \
XFS_SB_VERSION2_FTYPE)
/* Maximum size of the xfs filesystem label, no terminating NULL */
#define XFSLABEL_MAX 12
/*
* 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_rfsblock_t sb_dblocks; /* number of data blocks */
xfs_rfsblock_t sb_rblocks; /* number of realtime blocks */
xfs_rtblock_t sb_rextents; /* number of realtime extents */
uuid_t sb_uuid; /* user-visible file system unique id */
xfs_fsblock_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[XFSLABEL_MAX]; /* 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.
*
* This is not kept up to date in memory; it is always overwritten by
* the value in sb_features2 when formatting the incore superblock to
* the disk buffer.
*/
uint32_t sb_bad_features2;
/* version 5 superblock fields start here */
/* feature masks */
uint32_t sb_features_compat;
uint32_t sb_features_ro_compat;
uint32_t sb_features_incompat;
uint32_t sb_features_log_incompat;
uint32_t sb_crc; /* superblock crc */
xfs_extlen_t sb_spino_align; /* sparse inode chunk alignment */
xfs_ino_t sb_pquotino; /* project quota inode */
xfs_lsn_t sb_lsn; /* last write sequence */
uuid_t sb_meta_uuid; /* metadata file system unique id */
/* must be padded to 64 bit alignment */
} xfs_sb_t;
#define XFS_SB_CRC_OFF offsetof(struct xfs_sb, sb_crc)
/*
* 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; /* user-visible 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[XFSLABEL_MAX]; /* 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;
/* version 5 superblock fields start here */
/* feature masks */
__be32 sb_features_compat;
__be32 sb_features_ro_compat;
__be32 sb_features_incompat;
__be32 sb_features_log_incompat;
__le32 sb_crc; /* superblock crc */
__be32 sb_spino_align; /* sparse inode chunk alignment */
__be64 sb_pquotino; /* project quota inode */
__be64 sb_lsn; /* last write sequence */
uuid_t sb_meta_uuid; /* metadata file system unique id */
/* must be padded to 64 bit alignment */
} xfs_dsb_t;
/*
* 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)
/*
* The first XFS version we support is a v4 superblock with V2 directories.
*/
static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp)
{
if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT))
return false;
if (!(sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT))
return false;
/* check for unknown features in the fs */
if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) ||
((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
(sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS)))
return false;
return true;
}
static inline bool xfs_sb_good_version(struct xfs_sb *sbp)
{
if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5)
return true;
if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
return xfs_sb_good_v4_features(sbp);
return false;
}
static inline bool xfs_sb_version_hasrealtime(struct xfs_sb *sbp)
{
return sbp->sb_rblocks > 0;
}
/*
* Detect a mismatched features2 field. Older kernels read/wrote
* this into the wrong slot, so to be safe we keep them in sync.
*/
static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp)
{
return sbp->sb_bad_features2 != sbp->sb_features2;
}
static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp)
{
return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT);
}
static inline void xfs_sb_version_addattr(struct xfs_sb *sbp)
{
sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
}
static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp)
{
return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
}
static inline void xfs_sb_version_addquota(struct xfs_sb *sbp)
{
sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
}
static inline bool xfs_sb_version_hasalign(struct xfs_sb *sbp)
{
return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
(sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT));
}
static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp)
{
return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
}
static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp)
{
return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
(sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
}
static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp)
{
return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
}
static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp)
{
return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
}
static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp)
{
return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
(sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
}
/*
* sb_features2 bit version macros.
*/
static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb *sbp)
{
return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
(xfs_sb_version_hasmorebits(sbp) &&
(sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT));
}
static inline bool xfs_sb_version_hasattr2(struct xfs_sb *sbp)
{
return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
(xfs_sb_version_hasmorebits(sbp) &&
(sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT));
}
static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp)
{
sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
}
static inline void xfs_sb_version_removeattr2(struct xfs_sb *sbp)
{
sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
if (!sbp->sb_features2)
sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
}
static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb *sbp)
{
return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
(xfs_sb_version_hasmorebits(sbp) &&
(sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT));
}
static inline void xfs_sb_version_addprojid32bit(struct xfs_sb *sbp)
{
sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT;
}
/*
* Extended v5 superblock feature masks. These are to be used for new v5
* superblock features only.
*
* Compat features are new features that old kernels will not notice or affect
* and so can mount read-write without issues.
*
* RO-Compat (read only) are features that old kernels can read but will break
* if they write. Hence only read-only mounts of such filesystems are allowed on
* kernels that don't support the feature bit.
*
* InCompat features are features which old kernels will not understand and so
* must not mount.
*
* Log-InCompat features are for changes to log formats or new transactions that
* can't be replayed on older kernels. The fields are set when the filesystem is
* mounted, and a clean unmount clears the fields.
*/
#define XFS_SB_FEAT_COMPAT_ALL 0
#define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL
static inline bool
xfs_sb_has_compat_feature(
struct xfs_sb *sbp,
uint32_t feature)
{
return (sbp->sb_features_compat & feature) != 0;
}
#define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */
#define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */
#define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */
#define XFS_SB_FEAT_RO_COMPAT_ALL \
(XFS_SB_FEAT_RO_COMPAT_FINOBT | \
XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
XFS_SB_FEAT_RO_COMPAT_REFLINK)
#define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
static inline bool
xfs_sb_has_ro_compat_feature(
struct xfs_sb *sbp,
uint32_t feature)
{
return (sbp->sb_features_ro_compat & feature) != 0;
}
#define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */
#define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */
#define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */
#define XFS_SB_FEAT_INCOMPAT_ALL \
(XFS_SB_FEAT_INCOMPAT_FTYPE| \
XFS_SB_FEAT_INCOMPAT_SPINODES| \
XFS_SB_FEAT_INCOMPAT_META_UUID)
#define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL
static inline bool
xfs_sb_has_incompat_feature(
struct xfs_sb *sbp,
uint32_t feature)
{
return (sbp->sb_features_incompat & feature) != 0;
}
#define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
#define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
static inline bool
xfs_sb_has_incompat_log_feature(
struct xfs_sb *sbp,
uint32_t feature)
{
return (sbp->sb_features_log_incompat & feature) != 0;
}
/*
* V5 superblock specific feature checks
*/
static inline bool xfs_sb_version_hascrc(struct xfs_sb *sbp)
{
return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
}
static inline bool xfs_sb_version_has_pquotino(struct xfs_sb *sbp)
{
return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
}
static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp)
{
return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) ||
(xfs_sb_version_hasmorebits(sbp) &&
(sbp->sb_features2 & XFS_SB_VERSION2_FTYPE));
}
static inline bool xfs_sb_version_hasfinobt(xfs_sb_t *sbp)
{
return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
(sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT);
}
static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb *sbp)
{
return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_SPINODES);
}
/*
* XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID
* is stored separately from the user-visible UUID; this allows the
* user-visible UUID to be changed on V5 filesystems which have a
* filesystem UUID stamped into every piece of metadata.
*/
static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp)
{
return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
(sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID);
}
static inline bool xfs_sb_version_hasrmapbt(struct xfs_sb *sbp)
{
return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
(sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT);
}
static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp)
{
return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
(sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK);
}
/*
* end of superblock version macros
*/
static inline bool
xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
{
return (ino == sbp->sb_uquotino ||
ino == sbp->sb_gquotino ||
ino == sbp->sb_pquotino);
}
#define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */
#define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
#define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr))
#define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
#define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \
xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
#define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \
XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
/*
* File system sector to basic block conversions.
*/
#define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log)
/*
* File system block to basic block conversions.
*/
#define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
#define XFS_BB_TO_FSB(mp,bb) \
(((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
#define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log)
/*
* File system block to byte conversions.
*/
#define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
#define XFS_B_TO_FSB(mp,b) \
((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
#define XFS_B_TO_FSBT(mp,b) (((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
#define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask)
/*
* Allocation group header
*
* This is divided into three structures, placed in sequential 512-byte
* buffers after a copy of the superblock (also in a 512-byte buffer).
*/
#define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */
#define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */
#define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */
#define XFS_AGF_VERSION 1
#define XFS_AGI_VERSION 1
#define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
#define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
/*
* Btree number 0 is bno, 1 is cnt, 2 is rmap. This value gives the size of the
* arrays below.
*/
#define XFS_BTNUM_AGF ((int)XFS_BTNUM_RMAPi + 1)
/*
* The second word of agf_levels in the first a.g. overlaps the EFS
* superblock's magic number. Since the magic numbers valid for EFS
* are > 64k, our value cannot be confused for an EFS superblock's.
*/
typedef struct xfs_agf {
/*
* Common allocation group header information
*/
__be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */
__be32 agf_versionnum; /* header version == XFS_AGF_VERSION */
__be32 agf_seqno; /* sequence # starting from 0 */
__be32 agf_length; /* size in blocks of a.g. */
/*
* Freespace and rmap information
*/
__be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */
__be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */
__be32 agf_flfirst; /* first freelist block's index */
__be32 agf_fllast; /* last freelist block's index */
__be32 agf_flcount; /* count of blocks in freelist */
__be32 agf_freeblks; /* total free blocks */
__be32 agf_longest; /* longest free space */
__be32 agf_btreeblks; /* # of blocks held in AGF btrees */
uuid_t agf_uuid; /* uuid of filesystem */
__be32 agf_rmap_blocks; /* rmapbt blocks used */
__be32 agf_refcount_blocks; /* refcountbt blocks used */
__be32 agf_refcount_root; /* refcount tree root block */
__be32 agf_refcount_level; /* refcount btree levels */
/*
* reserve some contiguous space for future logged fields before we add
* the unlogged fields. This makes the range logging via flags and
* structure offsets much simpler.
*/
__be64 agf_spare64[14];
/* unlogged fields, written during buffer writeback. */
__be64 agf_lsn; /* last write sequence */
__be32 agf_crc; /* crc of agf sector */
__be32 agf_spare2;
/* structure must be padded to 64 bit alignment */
} xfs_agf_t;
#define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc)
#define XFS_AGF_MAGICNUM 0x00000001
#define XFS_AGF_VERSIONNUM 0x00000002
#define XFS_AGF_SEQNO 0x00000004
#define XFS_AGF_LENGTH 0x00000008
#define XFS_AGF_ROOTS 0x00000010
#define XFS_AGF_LEVELS 0x00000020
#define XFS_AGF_FLFIRST 0x00000040
#define XFS_AGF_FLLAST 0x00000080
#define XFS_AGF_FLCOUNT 0x00000100
#define XFS_AGF_FREEBLKS 0x00000200
#define XFS_AGF_LONGEST 0x00000400
#define XFS_AGF_BTREEBLKS 0x00000800
#define XFS_AGF_UUID 0x00001000
#define XFS_AGF_RMAP_BLOCKS 0x00002000
#define XFS_AGF_REFCOUNT_BLOCKS 0x00004000
#define XFS_AGF_REFCOUNT_ROOT 0x00008000
#define XFS_AGF_REFCOUNT_LEVEL 0x00010000
#define XFS_AGF_SPARE64 0x00020000
#define XFS_AGF_NUM_BITS 18
#define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1)
#define XFS_AGF_FLAGS \
{ XFS_AGF_MAGICNUM, "MAGICNUM" }, \
{ XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \
{ XFS_AGF_SEQNO, "SEQNO" }, \
{ XFS_AGF_LENGTH, "LENGTH" }, \
{ XFS_AGF_ROOTS, "ROOTS" }, \
{ XFS_AGF_LEVELS, "LEVELS" }, \
{ XFS_AGF_FLFIRST, "FLFIRST" }, \
{ XFS_AGF_FLLAST, "FLLAST" }, \
{ XFS_AGF_FLCOUNT, "FLCOUNT" }, \
{ XFS_AGF_FREEBLKS, "FREEBLKS" }, \
{ XFS_AGF_LONGEST, "LONGEST" }, \
{ XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \
{ XFS_AGF_UUID, "UUID" }, \
{ XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \
{ XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \
{ XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \
{ XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \
{ XFS_AGF_SPARE64, "SPARE64" }
/* disk block (xfs_daddr_t) in the AG */
#define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
#define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
#define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr))
/*
* Size of the unlinked inode hash table in the agi.
*/
#define XFS_AGI_UNLINKED_BUCKETS 64
typedef struct xfs_agi {
/*
* Common allocation group header information
*/
__be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */
__be32 agi_versionnum; /* header version == XFS_AGI_VERSION */
__be32 agi_seqno; /* sequence # starting from 0 */
__be32 agi_length; /* size in blocks of a.g. */
/*
* Inode information
* Inodes are mapped by interpreting the inode number, so no
* mapping data is needed here.
*/
__be32 agi_count; /* count of allocated inodes */
__be32 agi_root; /* root of inode btree */
__be32 agi_level; /* levels in inode btree */
__be32 agi_freecount; /* number of free inodes */
__be32 agi_newino; /* new inode just allocated */
__be32 agi_dirino; /* last directory inode chunk */
/*
* Hash table of inodes which have been unlinked but are
* still being referenced.
*/
__be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
/*
* This marks the end of logging region 1 and start of logging region 2.
*/
uuid_t agi_uuid; /* uuid of filesystem */
__be32 agi_crc; /* crc of agi sector */
__be32 agi_pad32;
__be64 agi_lsn; /* last write sequence */
__be32 agi_free_root; /* root of the free inode btree */
__be32 agi_free_level;/* levels in free inode btree */
/* structure must be padded to 64 bit alignment */
} xfs_agi_t;
#define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc)
#define XFS_AGI_MAGICNUM (1 << 0)
#define XFS_AGI_VERSIONNUM (1 << 1)
#define XFS_AGI_SEQNO (1 << 2)
#define XFS_AGI_LENGTH (1 << 3)
#define XFS_AGI_COUNT (1 << 4)
#define XFS_AGI_ROOT (1 << 5)
#define XFS_AGI_LEVEL (1 << 6)
#define XFS_AGI_FREECOUNT (1 << 7)
#define XFS_AGI_NEWINO (1 << 8)
#define XFS_AGI_DIRINO (1 << 9)
#define XFS_AGI_UNLINKED (1 << 10)
#define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */
#define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1)
#define XFS_AGI_FREE_ROOT (1 << 11)
#define XFS_AGI_FREE_LEVEL (1 << 12)
#define XFS_AGI_NUM_BITS_R2 13
/* disk block (xfs_daddr_t) in the AG */
#define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
#define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
#define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr))
/*
* The third a.g. block contains the a.g. freelist, an array
* of block pointers to blocks owned by the allocation btree code.
*/
#define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
#define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
#define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr))
#define XFS_BUF_TO_AGFL_BNO(mp, bp) \
(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
&(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \
(__be32 *)(bp)->b_addr)
typedef struct xfs_agfl {
__be32 agfl_magicnum;
__be32 agfl_seqno;
uuid_t agfl_uuid;
__be64 agfl_lsn;
__be32 agfl_crc;
__be32 agfl_bno[]; /* actually xfs_agfl_size(mp) */
} __attribute__((packed)) xfs_agfl_t;
#define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc)
#define XFS_AGB_TO_FSB(mp,agno,agbno) \
(((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
#define XFS_FSB_TO_AGNO(mp,fsbno) \
((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
#define XFS_FSB_TO_AGBNO(mp,fsbno) \
((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
#define XFS_AGB_TO_DADDR(mp,agno,agbno) \
((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
(xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
#define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
/*
* For checking for bad ranges of xfs_daddr_t's, covering multiple
* allocation groups or a single xfs_daddr_t that's a superblock copy.
*/
#define XFS_AG_CHECK_DADDR(mp,d,len) \
((len) == 1 ? \
ASSERT((d) == XFS_SB_DADDR || \
xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
ASSERT(xfs_daddr_to_agno(mp, d) == \
xfs_daddr_to_agno(mp, (d) + (len) - 1)))
typedef struct xfs_timestamp {
__be32 t_sec; /* timestamp seconds */
__be32 t_nsec; /* timestamp nanoseconds */
} xfs_timestamp_t;
/*
* On-disk inode structure.
*
* This is just the header or "dinode core", the inode is expanded to fill a
* variable size the leftover area split into a data and an attribute fork.
* The format of the data and attribute fork depends on the format of the
* inode as indicated by di_format and di_aformat. To access the data and
* attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros
* below.
*
* There is a very similar struct icdinode in xfs_inode which matches the
* layout of the first 96 bytes of this structure, but is kept in native
* format instead of big endian.
*
* Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
* padding field for v3 inodes.
*/
#define XFS_DINODE_MAGIC 0x494e /* 'IN' */
typedef struct xfs_dinode {
__be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */
__be16 di_mode; /* mode and type of file */
__u8 di_version; /* inode version */
__u8 di_format; /* format of di_c data */
__be16 di_onlink; /* old number of links to file */
__be32 di_uid; /* owner's user id */
__be32 di_gid; /* owner's group id */
__be32 di_nlink; /* number of links to file */
__be16 di_projid_lo; /* lower part of owner's project id */
__be16 di_projid_hi; /* higher part owner's project id */
__u8 di_pad[6]; /* unused, zeroed space */
__be16 di_flushiter; /* incremented on flush */
xfs_timestamp_t di_atime; /* time last accessed */
xfs_timestamp_t di_mtime; /* time last modified */
xfs_timestamp_t di_ctime; /* time created/inode modified */
__be64 di_size; /* number of bytes in file */
__be64 di_nblocks; /* # of direct & btree blocks used */
__be32 di_extsize; /* basic/minimum extent size for file */
__be32 di_nextents; /* number of extents in data fork */
__be16 di_anextents; /* number of extents in attribute fork*/
__u8 di_forkoff; /* attr fork offs, <<3 for 64b align */
__s8 di_aformat; /* format of attr fork's data */
__be32 di_dmevmask; /* DMIG event mask */
__be16 di_dmstate; /* DMIG state info */
__be16 di_flags; /* random flags, XFS_DIFLAG_... */
__be32 di_gen; /* generation number */
/* di_next_unlinked is the only non-core field in the old dinode */
__be32 di_next_unlinked;/* agi unlinked list ptr */
/* start of the extended dinode, writable fields */
__le32 di_crc; /* CRC of the inode */
__be64 di_changecount; /* number of attribute changes */
__be64 di_lsn; /* flush sequence */
__be64 di_flags2; /* more random flags */
__be32 di_cowextsize; /* basic cow extent size for file */
__u8 di_pad2[12]; /* more padding for future expansion */
/* fields only written to during inode creation */
xfs_timestamp_t di_crtime; /* time created */
__be64 di_ino; /* inode number */
uuid_t di_uuid; /* UUID of the filesystem */
/* structure must be padded to 64 bit alignment */
} xfs_dinode_t;
#define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc)
#define DI_MAX_FLUSH 0xffff
/*
* Size of the core inode on disk. Version 1 and 2 inodes have
* the same size, but version 3 has grown a few additional fields.
*/
static inline uint xfs_dinode_size(int version)
{
if (version == 3)
return sizeof(struct xfs_dinode);
return offsetof(struct xfs_dinode, di_crc);
}
/*
* The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
* Since the pathconf interface is signed, we use 2^31 - 1 instead.
*/
#define XFS_MAXLINK ((1U << 31) - 1U)
/*
* Values for di_format
*/
typedef enum xfs_dinode_fmt {
XFS_DINODE_FMT_DEV, /* xfs_dev_t */
XFS_DINODE_FMT_LOCAL, /* bulk data */
XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */
XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */
XFS_DINODE_FMT_UUID /* added long ago, but never used */
} xfs_dinode_fmt_t;
/*
* Inode minimum and maximum sizes.
*/
#define XFS_DINODE_MIN_LOG 8
#define XFS_DINODE_MAX_LOG 11
#define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG)
#define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG)
/*
* Inode size for given fs.
*/
#define XFS_LITINO(mp, version) \
((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version)))
/*
* Inode data & attribute fork sizes, per inode.
*/
#define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0)
#define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3))
#define XFS_DFORK_DSIZE(dip,mp) \
(XFS_DFORK_Q(dip) ? \
XFS_DFORK_BOFF(dip) : \
XFS_LITINO(mp, (dip)->di_version))
#define XFS_DFORK_ASIZE(dip,mp) \
(XFS_DFORK_Q(dip) ? \
XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \
0)
#define XFS_DFORK_SIZE(dip,mp,w) \
((w) == XFS_DATA_FORK ? \
XFS_DFORK_DSIZE(dip, mp) : \
XFS_DFORK_ASIZE(dip, mp))
#define XFS_DFORK_MAXEXT(dip, mp, w) \
(XFS_DFORK_SIZE(dip, mp, w) / sizeof(struct xfs_bmbt_rec))
/*
* Return pointers to the data or attribute forks.
*/
#define XFS_DFORK_DPTR(dip) \
((char *)dip + xfs_dinode_size(dip->di_version))
#define XFS_DFORK_APTR(dip) \
(XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
#define XFS_DFORK_PTR(dip,w) \
((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
#define XFS_DFORK_FORMAT(dip,w) \
((w) == XFS_DATA_FORK ? \
(dip)->di_format : \
(dip)->di_aformat)
#define XFS_DFORK_NEXTENTS(dip,w) \
((w) == XFS_DATA_FORK ? \
be32_to_cpu((dip)->di_nextents) : \
be16_to_cpu((dip)->di_anextents))
/*
* For block and character special files the 32bit dev_t is stored at the
* beginning of the data fork.
*/
static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
{
return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
}
static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
{
*(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
}
/*
* Values for di_flags
*/
#define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */
#define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */
#define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */
#define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */
#define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */
#define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */
#define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */
#define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */
#define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */
#define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */
#define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */
#define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */
#define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */
#define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */
#define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */
/* Do not use bit 15, di_flags is legacy and unchanging now */
#define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT)
#define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT)
#define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT)
#define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT)
#define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT)
#define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT)
#define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT)
#define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT)
#define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT)
#define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT)
#define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
#define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT)
#define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
#define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT)
#define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT)
#define XFS_DIFLAG_ANY \
(XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
/*
* Values for di_flags2 These start by being exposed to userspace in the upper
* 16 bits of the XFS_XFLAG_s range.
*/
#define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */
#define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */
#define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */
#define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT)
#define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT)
#define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT)
#define XFS_DIFLAG2_ANY \
(XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)
/*
* Inode number format:
* low inopblog bits - offset in block
* next agblklog bits - block number in ag
* next agno_log bits - ag number
* high agno_log-agblklog-inopblog bits - 0
*/
#define XFS_INO_MASK(k) (uint32_t)((1ULL << (k)) - 1)
#define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog
#define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog
#define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log
#define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log
#define XFS_INO_BITS(mp) \
XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
#define XFS_INO_TO_AGNO(mp,i) \
((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
#define XFS_INO_TO_AGINO(mp,i) \
((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
#define XFS_INO_TO_AGBNO(mp,i) \
(((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
#define XFS_INO_TO_OFFSET(mp,i) \
((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
#define XFS_INO_TO_FSB(mp,i) \
XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
#define XFS_AGINO_TO_INO(mp,a,i) \
(((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
#define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp))
#define XFS_AGINO_TO_OFFSET(mp,i) \
((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
#define XFS_OFFBNO_TO_AGINO(mp,b,o) \
((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
#define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL))
#define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL))
/*
* RealTime Device format definitions
*/
/* Min and max rt extent sizes, specified in bytes */
#define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
#define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */
#define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */
#define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize)
#define XFS_BLOCKMASK(mp) ((mp)->m_blockmask)
#define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize)
#define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask)
/*
* RT Summary and bit manipulation macros.
*/
#define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
#define XFS_SUMOFFSTOBLOCK(mp,s) \
(((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
#define XFS_SUMPTR(mp,bp,so) \
((xfs_suminfo_t *)((bp)->b_addr + \
(((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
#define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log)
#define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log)
#define XFS_BITTOWORD(mp,bi) \
((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
#define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b))
#define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b))
#define XFS_RTLOBIT(w) xfs_lowbit32(w)
#define XFS_RTHIBIT(w) xfs_highbit32(w)
#define XFS_RTBLOCKLOG(b) xfs_highbit64(b)
/*
* Dquot and dquot block format definitions
*/
#define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */
#define XFS_DQUOT_VERSION (uint8_t)0x01 /* latest version number */
/*
* This is the main portion of the on-disk representation of quota
* information for a user. This is the q_core of the xfs_dquot_t that
* is kept in kernel memory. We pad this with some more expansion room
* to construct the on disk structure.
*/
typedef struct xfs_disk_dquot {
__be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */
__u8 d_version; /* dquot version */
__u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */
__be32 d_id; /* user,project,group id */
__be64 d_blk_hardlimit;/* absolute limit on disk blks */
__be64 d_blk_softlimit;/* preferred limit on disk blks */
__be64 d_ino_hardlimit;/* maximum # allocated inodes */
__be64 d_ino_softlimit;/* preferred inode limit */
__be64 d_bcount; /* disk blocks owned by the user */
__be64 d_icount; /* inodes owned by the user */
__be32 d_itimer; /* zero if within inode limits if not,
this is when we refuse service */
__be32 d_btimer; /* similar to above; for disk blocks */
__be16 d_iwarns; /* warnings issued wrt num inodes */
__be16 d_bwarns; /* warnings issued wrt disk blocks */
__be32 d_pad0; /* 64 bit align */
__be64 d_rtb_hardlimit;/* absolute limit on realtime blks */
__be64 d_rtb_softlimit;/* preferred limit on RT disk blks */
__be64 d_rtbcount; /* realtime blocks owned */
__be32 d_rtbtimer; /* similar to above; for RT disk blocks */
__be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */
__be16 d_pad;
} xfs_disk_dquot_t;
/*
* This is what goes on disk. This is separated from the xfs_disk_dquot because
* carrying the unnecessary padding would be a waste of memory.
*/
typedef struct xfs_dqblk {
xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */
char dd_fill[4]; /* filling for posterity */
/*
* These two are only present on filesystems with the CRC bits set.
*/
__be32 dd_crc; /* checksum */
__be64 dd_lsn; /* last modification in log */
uuid_t dd_uuid; /* location information */
} xfs_dqblk_t;
#define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc)
/*
* Remote symlink format and access functions.
*/
#define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */
struct xfs_dsymlink_hdr {
__be32 sl_magic;
__be32 sl_offset;
__be32 sl_bytes;
__be32 sl_crc;
uuid_t sl_uuid;
__be64 sl_owner;
__be64 sl_blkno;
__be64 sl_lsn;
};
#define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc)
#define XFS_SYMLINK_MAXLEN 1024
/*
* The maximum pathlen is 1024 bytes. Since the minimum file system
* blocksize is 512 bytes, we can get a max of 3 extents back from
* bmapi when crc headers are taken into account.
*/
#define XFS_SYMLINK_MAPS 3
#define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \
((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \
sizeof(struct xfs_dsymlink_hdr) : 0))
/*
* Allocation Btree format definitions
*
* There are two on-disk btrees, one sorted by blockno and one sorted
* by blockcount and blockno. All blocks look the same to make the code
* simpler; if we have time later, we'll make the optimizations.
*/
#define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */
#define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */
#define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */
#define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */
/*
* Data record/key structure
*/
typedef struct xfs_alloc_rec {
__be32 ar_startblock; /* starting block number */
__be32 ar_blockcount; /* count of free blocks */
} xfs_alloc_rec_t, xfs_alloc_key_t;
typedef struct xfs_alloc_rec_incore {
xfs_agblock_t ar_startblock; /* starting block number */
xfs_extlen_t ar_blockcount; /* count of free blocks */
} xfs_alloc_rec_incore_t;
/* btree pointer type */
typedef __be32 xfs_alloc_ptr_t;
/*
* Block numbers in the AG:
* SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
*/
#define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
#define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
/*
* Inode Allocation Btree format definitions
*
* There is a btree for the inode map per allocation group.
*/
#define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
#define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */
#define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */
#define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */
typedef uint64_t xfs_inofree_t;
#define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
#define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
#define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
#define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
#define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */
#define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(uint16_t))
#define XFS_INODES_PER_HOLEMASK_BIT \
(XFS_INODES_PER_CHUNK / (NBBY * sizeof(uint16_t)))
static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
{
return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
}
/*
* The on-disk inode record structure has two formats. The original "full"
* format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount
* and replaces the 3 high-order freecount bytes wth the holemask and inode
* count.
*
* The holemask of the sparse record format allows an inode chunk to have holes
* that refer to blocks not owned by the inode record. This facilitates inode
* allocation in the event of severe free space fragmentation.
*/
typedef struct xfs_inobt_rec {
__be32 ir_startino; /* starting inode number */
union {
struct {
__be32 ir_freecount; /* count of free inodes */
} f;
struct {
__be16 ir_holemask;/* hole mask for sparse chunks */
__u8 ir_count; /* total inode count */
__u8 ir_freecount; /* count of free inodes */
} sp;
} ir_u;
__be64 ir_free; /* free inode mask */
} xfs_inobt_rec_t;
typedef struct xfs_inobt_rec_incore {
xfs_agino_t ir_startino; /* starting inode number */
uint16_t ir_holemask; /* hole mask for sparse chunks */
uint8_t ir_count; /* total inode count */
uint8_t ir_freecount; /* count of free inodes (set bits) */
xfs_inofree_t ir_free; /* free inode mask */
} xfs_inobt_rec_incore_t;
static inline bool xfs_inobt_issparse(uint16_t holemask)
{
/* non-zero holemask represents a sparse rec. */
return holemask;
}
/*
* Key structure
*/
typedef struct xfs_inobt_key {
__be32 ir_startino; /* starting inode number */
} xfs_inobt_key_t;
/* btree pointer type */
typedef __be32 xfs_inobt_ptr_t;
/*
* block numbers in the AG.
*/
#define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
#define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
/*
* Reverse mapping btree format definitions
*
* There is a btree for the reverse map per allocation group
*/
#define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */
/*
* Ownership info for an extent. This is used to create reverse-mapping
* entries.
*/
#define XFS_OWNER_INFO_ATTR_FORK (1 << 0)
#define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1)
struct xfs_owner_info {
uint64_t oi_owner;
xfs_fileoff_t oi_offset;
unsigned int oi_flags;
};
/*
* Special owner types.
*
* Seeing as we only support up to 8EB, we have the upper bit of the owner field
* to tell us we have a special owner value. We use these for static metadata
* allocated at mkfs/growfs time, as well as for freespace management metadata.
*/
#define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */
#define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */
#define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */
#define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */
#define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */
#define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */
#define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */
#define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */
#define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */
#define XFS_RMAP_OWN_MIN (-10ULL) /* guard */
#define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63)))
/*
* Data record structure
*/
struct xfs_rmap_rec {
__be32 rm_startblock; /* extent start block */
__be32 rm_blockcount; /* extent length */
__be64 rm_owner; /* extent owner */
__be64 rm_offset; /* offset within the owner */
};
/*
* rmap btree record
* rm_offset:63 is the attribute fork flag
* rm_offset:62 is the bmbt block flag
* rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt)
* rm_offset:54-60 aren't used and should be zero
* rm_offset:0-53 is the block offset within the inode
*/
#define XFS_RMAP_OFF_ATTR_FORK ((uint64_t)1ULL << 63)
#define XFS_RMAP_OFF_BMBT_BLOCK ((uint64_t)1ULL << 62)
#define XFS_RMAP_OFF_UNWRITTEN ((uint64_t)1ULL << 61)
#define XFS_RMAP_LEN_MAX ((uint32_t)~0U)
#define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \
XFS_RMAP_OFF_BMBT_BLOCK | \
XFS_RMAP_OFF_UNWRITTEN)
#define XFS_RMAP_OFF_MASK ((uint64_t)0x3FFFFFFFFFFFFFULL)
#define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK)
#define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK))
#define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK))
#define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN))
#define RMAPBT_STARTBLOCK_BITLEN 32
#define RMAPBT_BLOCKCOUNT_BITLEN 32
#define RMAPBT_OWNER_BITLEN 64
#define RMAPBT_ATTRFLAG_BITLEN 1
#define RMAPBT_BMBTFLAG_BITLEN 1
#define RMAPBT_EXNTFLAG_BITLEN 1
#define RMAPBT_UNUSED_OFFSET_BITLEN 7
#define RMAPBT_OFFSET_BITLEN 54
#define XFS_RMAP_ATTR_FORK (1 << 0)
#define XFS_RMAP_BMBT_BLOCK (1 << 1)
#define XFS_RMAP_UNWRITTEN (1 << 2)
#define XFS_RMAP_KEY_FLAGS (XFS_RMAP_ATTR_FORK | \
XFS_RMAP_BMBT_BLOCK)
#define XFS_RMAP_REC_FLAGS (XFS_RMAP_UNWRITTEN)
struct xfs_rmap_irec {
xfs_agblock_t rm_startblock; /* extent start block */
xfs_extlen_t rm_blockcount; /* extent length */
uint64_t rm_owner; /* extent owner */
uint64_t rm_offset; /* offset within the owner */
unsigned int rm_flags; /* state flags */
};
/*
* Key structure
*
* We don't use the length for lookups
*/
struct xfs_rmap_key {
__be32 rm_startblock; /* extent start block */
__be64 rm_owner; /* extent owner */
__be64 rm_offset; /* offset within the owner */
} __attribute__((packed));
/* btree pointer type */
typedef __be32 xfs_rmap_ptr_t;
#define XFS_RMAP_BLOCK(mp) \
(xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \
XFS_FIBT_BLOCK(mp) + 1 : \
XFS_IBT_BLOCK(mp) + 1)
/*
* Reference Count Btree format definitions
*
*/
#define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */
unsigned int xfs_refc_block(struct xfs_mount *mp);
/*
* Data record/key structure
*
* Each record associates a range of physical blocks (starting at
* rc_startblock and ending rc_blockcount blocks later) with a reference
* count (rc_refcount). Extents that are being used to stage a copy on
* write (CoW) operation are recorded in the refcount btree with a
* refcount of 1. All other records must have a refcount > 1 and must
* track an extent mapped only by file data forks.
*
* Extents with a single owner (attributes, metadata, non-shared file
* data) are not tracked here. Free space is also not tracked here.
* This is consistent with pre-reflink XFS.
*/
/*
* Extents that are being used to stage a copy on write are stored
* in the refcount btree with a refcount of 1 and the upper bit set
* on the startblock. This speeds up mount time deletion of stale
* staging extents because they're all at the right side of the tree.
*/
#define XFS_REFC_COW_START ((xfs_agblock_t)(1U << 31))
#define REFCNTBT_COWFLAG_BITLEN 1
#define REFCNTBT_AGBLOCK_BITLEN 31
struct xfs_refcount_rec {
__be32 rc_startblock; /* starting block number */
__be32 rc_blockcount; /* count of blocks */
__be32 rc_refcount; /* number of inodes linked here */
};
struct xfs_refcount_key {
__be32 rc_startblock; /* starting block number */
};
struct xfs_refcount_irec {
xfs_agblock_t rc_startblock; /* starting block number */
xfs_extlen_t rc_blockcount; /* count of free blocks */
xfs_nlink_t rc_refcount; /* number of inodes linked here */
};
#define MAXREFCOUNT ((xfs_nlink_t)~0U)
#define MAXREFCEXTLEN ((xfs_extlen_t)~0U)
/* btree pointer type */
typedef __be32 xfs_refcount_ptr_t;
/*
* BMAP Btree format definitions
*
* This includes both the root block definition that sits inside an inode fork
* and the record/pointer formats for the leaf/node in the blocks.
*/
#define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
#define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */
/*
* Bmap root header, on-disk form only.
*/
typedef struct xfs_bmdr_block {
__be16 bb_level; /* 0 is a leaf */
__be16 bb_numrecs; /* current # of data records */
} xfs_bmdr_block_t;
/*
* Bmap btree record and extent descriptor.
* l0:63 is an extent flag (value 1 indicates non-normal).
* l0:9-62 are startoff.
* l0:0-8 and l1:21-63 are startblock.
* l1:0-20 are blockcount.
*/
#define BMBT_EXNTFLAG_BITLEN 1
#define BMBT_STARTOFF_BITLEN 54
#define BMBT_STARTBLOCK_BITLEN 52
#define BMBT_BLOCKCOUNT_BITLEN 21
#define BMBT_STARTOFF_MASK ((1ULL << BMBT_STARTOFF_BITLEN) - 1)
typedef struct xfs_bmbt_rec {
__be64 l0, l1;
} xfs_bmbt_rec_t;
typedef uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
/*
* Values and macros for delayed-allocation startblock fields.
*/
#define STARTBLOCKVALBITS 17
#define STARTBLOCKMASKBITS (15 + 20)
#define STARTBLOCKMASK \
(((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
static inline int isnullstartblock(xfs_fsblock_t x)
{
return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
}
static inline xfs_fsblock_t nullstartblock(int k)
{
ASSERT(k < (1 << STARTBLOCKVALBITS));
return STARTBLOCKMASK | (k);
}
static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
{
return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
}
/*
* Key structure for non-leaf levels of the tree.
*/
typedef struct xfs_bmbt_key {
__be64 br_startoff; /* starting file offset */
} xfs_bmbt_key_t, xfs_bmdr_key_t;
/* btree pointer type */
typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
/*
* Generic Btree block format definitions
*
* This is a combination of the actual format used on disk for short and long
* format btrees. The first three fields are shared by both format, but the
* pointers are different and should be used with care.
*
* To get the size of the actual short or long form headers please use the size
* macros below. Never use sizeof(xfs_btree_block).
*
* The blkno, crc, lsn, owner and uuid fields are only available in filesystems
* with the crc feature bit, and all accesses to them must be conditional on
* that flag.
*/
/* short form block header */
struct xfs_btree_block_shdr {
__be32 bb_leftsib;
__be32 bb_rightsib;
__be64 bb_blkno;
__be64 bb_lsn;
uuid_t bb_uuid;
__be32 bb_owner;
__le32 bb_crc;
};
/* long form block header */
struct xfs_btree_block_lhdr {
__be64 bb_leftsib;
__be64 bb_rightsib;
__be64 bb_blkno;
__be64 bb_lsn;
uuid_t bb_uuid;
__be64 bb_owner;
__le32 bb_crc;
__be32 bb_pad; /* padding for alignment */
};
struct xfs_btree_block {
__be32 bb_magic; /* magic number for block type */
__be16 bb_level; /* 0 is a leaf */
__be16 bb_numrecs; /* current # of data records */
union {
struct xfs_btree_block_shdr s;
struct xfs_btree_block_lhdr l;
} bb_u; /* rest */
};
/* size of a short form block */
#define XFS_BTREE_SBLOCK_LEN \
(offsetof(struct xfs_btree_block, bb_u) + \
offsetof(struct xfs_btree_block_shdr, bb_blkno))
/* size of a long form block */
#define XFS_BTREE_LBLOCK_LEN \
(offsetof(struct xfs_btree_block, bb_u) + \
offsetof(struct xfs_btree_block_lhdr, bb_blkno))
/* sizes of CRC enabled btree blocks */
#define XFS_BTREE_SBLOCK_CRC_LEN \
(offsetof(struct xfs_btree_block, bb_u) + \
sizeof(struct xfs_btree_block_shdr))
#define XFS_BTREE_LBLOCK_CRC_LEN \
(offsetof(struct xfs_btree_block, bb_u) + \
sizeof(struct xfs_btree_block_lhdr))
#define XFS_BTREE_SBLOCK_CRC_OFF \
offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
#define XFS_BTREE_LBLOCK_CRC_OFF \
offsetof(struct xfs_btree_block, bb_u.l.bb_crc)
/*
* On-disk XFS access control list structure.
*/
struct xfs_acl_entry {
__be32 ae_tag;
__be32 ae_id;
__be16 ae_perm;
__be16 ae_pad; /* fill the implicit hole in the structure */
};
struct xfs_acl {
__be32 acl_cnt;
struct xfs_acl_entry acl_entry[0];
};
/*
* The number of ACL entries allowed is defined by the on-disk format.
* For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
* limited only by the maximum size of the xattr that stores the information.
*/
#define XFS_ACL_MAX_ENTRIES(mp) \
(xfs_sb_version_hascrc(&mp->m_sb) \
? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
sizeof(struct xfs_acl_entry) \
: 25)
#define XFS_ACL_SIZE(cnt) \
(sizeof(struct xfs_acl) + \
sizeof(struct xfs_acl_entry) * cnt)
#define XFS_ACL_MAX_SIZE(mp) \
XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp)))
/* On-disk XFS extended attribute names */
#define SGI_ACL_FILE "SGI_ACL_FILE"
#define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT"
#define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1)
#define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1)
#endif /* __XFS_FORMAT_H__ */
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