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android-kvm / linux / 7137d8b084e2d7d515e550f7268e2c907527a6d2 / . / fs / xfs / libxfs / xfs_format.h
blob: 371dc07233e059a95545629107d409f21653dbe4 [file] [log] [blame]
/* 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.
*/
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 */
};
/*
* 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)
static inline bool xfs_sb_is_v5(struct xfs_sb *sbp)
{
return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
}
/*
* 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_hasmorebits(struct xfs_sb *sbp)
{
return xfs_sb_is_v5(sbp) ||
(sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
}
static inline void xfs_sb_version_addattr(struct xfs_sb *sbp)
{
sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
}
static inline void xfs_sb_version_addquota(struct xfs_sb *sbp)
{
sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
}
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_addprojid32(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_INOBTCNT (1 << 3) /* inobt block counts */
#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| \
XFS_SB_FEAT_RO_COMPAT_INOBTCNT)
#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_BIGTIME (1 << 3) /* large timestamps */
#define XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR (1 << 4) /* needs xfs_repair */
#define XFS_SB_FEAT_INCOMPAT_NREXT64 (1 << 5) /* large extent counters */
#define XFS_SB_FEAT_INCOMPAT_ALL \
(XFS_SB_FEAT_INCOMPAT_FTYPE| \
XFS_SB_FEAT_INCOMPAT_SPINODES| \
XFS_SB_FEAT_INCOMPAT_META_UUID| \
XFS_SB_FEAT_INCOMPAT_BIGTIME| \
XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR| \
XFS_SB_FEAT_INCOMPAT_NREXT64)
#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_XATTRS (1 << 0) /* Delayed Attributes */
#define XFS_SB_FEAT_INCOMPAT_LOG_ALL \
(XFS_SB_FEAT_INCOMPAT_LOG_XATTRS)
#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;
}
static inline void
xfs_sb_remove_incompat_log_features(
struct xfs_sb *sbp)
{
sbp->sb_features_log_incompat &= ~XFS_SB_FEAT_INCOMPAT_LOG_ALL;
}
static inline void
xfs_sb_add_incompat_log_features(
struct xfs_sb *sbp,
unsigned int features)
{
sbp->sb_features_log_incompat |= features;
}
static inline bool xfs_sb_version_haslogxattrs(struct xfs_sb *sbp)
{
return xfs_sb_is_v5(sbp) && (sbp->sb_features_log_incompat &
XFS_SB_FEAT_INCOMPAT_LOG_XATTRS);
}
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_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)
/*
* 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 (1u << 0)
#define XFS_AGF_VERSIONNUM (1u << 1)
#define XFS_AGF_SEQNO (1u << 2)
#define XFS_AGF_LENGTH (1u << 3)
#define XFS_AGF_ROOTS (1u << 4)
#define XFS_AGF_LEVELS (1u << 5)
#define XFS_AGF_FLFIRST (1u << 6)
#define XFS_AGF_FLLAST (1u << 7)
#define XFS_AGF_FLCOUNT (1u << 8)
#define XFS_AGF_FREEBLKS (1u << 9)
#define XFS_AGF_LONGEST (1u << 10)
#define XFS_AGF_BTREEBLKS (1u << 11)
#define XFS_AGF_UUID (1u << 12)
#define XFS_AGF_RMAP_BLOCKS (1u << 13)
#define XFS_AGF_REFCOUNT_BLOCKS (1u << 14)
#define XFS_AGF_REFCOUNT_ROOT (1u << 15)
#define XFS_AGF_REFCOUNT_LEVEL (1u << 16)
#define XFS_AGF_SPARE64 (1u << 17)
#define XFS_AGF_NUM_BITS 18
#define XFS_AGF_ALL_BITS ((1u << 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))
/*
* 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 */
__be32 agi_iblocks; /* inobt blocks used */
__be32 agi_fblocks; /* finobt blocks used */
/* 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 (1u << 0)
#define XFS_AGI_VERSIONNUM (1u << 1)
#define XFS_AGI_SEQNO (1u << 2)
#define XFS_AGI_LENGTH (1u << 3)
#define XFS_AGI_COUNT (1u << 4)
#define XFS_AGI_ROOT (1u << 5)
#define XFS_AGI_LEVEL (1u << 6)
#define XFS_AGI_FREECOUNT (1u << 7)
#define XFS_AGI_NEWINO (1u << 8)
#define XFS_AGI_DIRINO (1u << 9)
#define XFS_AGI_UNLINKED (1u << 10)
#define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */
#define XFS_AGI_ALL_BITS_R1 ((1u << XFS_AGI_NUM_BITS_R1) - 1)
#define XFS_AGI_FREE_ROOT (1u << 11)
#define XFS_AGI_FREE_LEVEL (1u << 12)
#define XFS_AGI_IBLOCKS (1u << 13) /* both inobt/finobt block counters */
#define XFS_AGI_NUM_BITS_R2 14
/* 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))
/*
* 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) ((struct xfs_agfl *)((bp)->b_addr))
struct xfs_agfl {
__be32 agfl_magicnum;
__be32 agfl_seqno;
uuid_t agfl_uuid;
__be64 agfl_lsn;
__be32 agfl_crc;
} __attribute__((packed));
#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)))
/*
* XFS Timestamps
* ==============
*
* Traditional ondisk inode timestamps consist of signed 32-bit counters for
* seconds and nanoseconds; time zero is the Unix epoch, Jan 1 00:00:00 UTC
* 1970, which means that the timestamp epoch is the same as the Unix epoch.
* Therefore, the ondisk min and max defined here can be used directly to
* constrain the incore timestamps on a Unix system. Note that we actually
* encode a __be64 value on disk.
*
* When the bigtime feature is enabled, ondisk inode timestamps become an
* unsigned 64-bit nanoseconds counter. This means that the bigtime inode
* timestamp epoch is the start of the classic timestamp range, which is
* Dec 13 20:45:52 UTC 1901. Because the epochs are not the same, callers
* /must/ use the bigtime conversion functions when encoding and decoding raw
* timestamps.
*/
typedef __be64 xfs_timestamp_t;
/* Legacy timestamp encoding format. */
struct xfs_legacy_timestamp {
__be32 t_sec; /* timestamp seconds */
__be32 t_nsec; /* timestamp nanoseconds */
};
/*
* Smallest possible ondisk seconds value with traditional timestamps. This
* corresponds exactly with the incore timestamp Dec 13 20:45:52 UTC 1901.
*/
#define XFS_LEGACY_TIME_MIN ((int64_t)S32_MIN)
/*
* Largest possible ondisk seconds value with traditional timestamps. This
* corresponds exactly with the incore timestamp Jan 19 03:14:07 UTC 2038.
*/
#define XFS_LEGACY_TIME_MAX ((int64_t)S32_MAX)
/*
* Smallest possible ondisk seconds value with bigtime timestamps. This
* corresponds (after conversion to a Unix timestamp) with the traditional
* minimum timestamp of Dec 13 20:45:52 UTC 1901.
*/
#define XFS_BIGTIME_TIME_MIN ((int64_t)0)
/*
* Largest supported ondisk seconds value with bigtime timestamps. This
* corresponds (after conversion to a Unix timestamp) with an incore timestamp
* of Jul 2 20:20:24 UTC 2486.
*
* We round down the ondisk limit so that the bigtime quota and inode max
* timestamps will be the same.
*/
#define XFS_BIGTIME_TIME_MAX ((int64_t)((-1ULL / NSEC_PER_SEC) & ~0x3ULL))
/*
* Bigtime epoch is set exactly to the minimum time value that a traditional
* 32-bit timestamp can represent when using the Unix epoch as a reference.
* Hence the Unix epoch is at a fixed offset into the supported bigtime
* timestamp range.
*
* The bigtime epoch also matches the minimum value an on-disk 32-bit XFS
* timestamp can represent so we will not lose any fidelity in converting
* to/from unix and bigtime timestamps.
*
* The following conversion factor converts a seconds counter from the Unix
* epoch to the bigtime epoch.
*/
#define XFS_BIGTIME_EPOCH_OFFSET (-(int64_t)S32_MIN)
/* Convert a timestamp from the Unix epoch to the bigtime epoch. */
static inline uint64_t xfs_unix_to_bigtime(time64_t unix_seconds)
{
return (uint64_t)unix_seconds + XFS_BIGTIME_EPOCH_OFFSET;
}
/* Convert a timestamp from the bigtime epoch to the Unix epoch. */
static inline time64_t xfs_bigtime_to_unix(uint64_t ondisk_seconds)
{
return (time64_t)ondisk_seconds - XFS_BIGTIME_EPOCH_OFFSET;
}
/*
* 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 xfs_log_dinode which matches the layout 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' */
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 */
union {
/* Number of data fork extents if NREXT64 is set */
__be64 di_big_nextents;
/* Padding for V3 inodes without NREXT64 set. */
__be64 di_v3_pad;
/* Padding and inode flush counter for V2 inodes. */
struct {
__u8 di_v2_pad[6];
__be16 di_flushiter;
};
};
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 */
union {
/*
* For V2 inodes and V3 inodes without NREXT64 set, this
* is the number of data and attr fork extents.
*/
struct {
__be32 di_nextents;
__be16 di_anextents;
} __packed;
/* Number of attr fork extents if NREXT64 is set. */
struct {
__be32 di_big_anextents;
__be16 di_nrext64_pad;
} __packed;
} __packed;
__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 */
};
#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
*
* This enum is used in string mapping in xfs_trace.h; please keep the
* TRACE_DEFINE_ENUMs for it up to date.
*/
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 */
};
#define XFS_INODE_FORMAT_STR \
{ XFS_DINODE_FMT_DEV, "dev" }, \
{ XFS_DINODE_FMT_LOCAL, "local" }, \
{ XFS_DINODE_FMT_EXTENTS, "extent" }, \
{ XFS_DINODE_FMT_BTREE, "btree" }, \
{ XFS_DINODE_FMT_UUID, "uuid" }
/*
* Max values for extnum and aextnum.
*
* The original on-disk extent counts were held in signed fields, resulting in
* maximum extent counts of 2^31 and 2^15 for the data and attr forks
* respectively. Similarly the maximum extent length is limited to 2^21 blocks
* by the 21-bit wide blockcount field of a BMBT extent record.
*
* The newly introduced data fork extent counter can hold a 64-bit value,
* however the maximum number of extents in a file is also limited to 2^54
* extents by the 54-bit wide startoff field of a BMBT extent record.
*
* It is further limited by the maximum supported file size of 2^63
* *bytes*. This leads to a maximum extent count for maximally sized filesystem
* blocks (64kB) of:
*
* 2^63 bytes / 2^16 bytes per block = 2^47 blocks
*
* Rounding up 47 to the nearest multiple of bits-per-byte results in 48. Hence
* 2^48 was chosen as the maximum data fork extent count.
*
* The maximum file size that can be represented by the data fork extent counter
* in the worst case occurs when all extents are 1 block in length and each
* block is 1KB in size.
*
* With XFS_MAX_EXTCNT_DATA_FORK_SMALL representing maximum extent count and
* with 1KB sized blocks, a file can reach upto,
* 1KB * (2^31) = 2TB
*
* This is much larger than the theoretical maximum size of a directory
* i.e. XFS_DIR2_SPACE_SIZE * XFS_DIR2_MAX_SPACES = ~96GB.
*
* Hence, a directory inode can never overflow its data fork extent counter.
*/
#define XFS_MAX_EXTCNT_DATA_FORK_LARGE ((xfs_extnum_t)((1ULL << 48) - 1))
#define XFS_MAX_EXTCNT_ATTR_FORK_LARGE ((xfs_extnum_t)((1ULL << 32) - 1))
#define XFS_MAX_EXTCNT_DATA_FORK_SMALL ((xfs_extnum_t)((1ULL << 31) - 1))
#define XFS_MAX_EXTCNT_ATTR_FORK_SMALL ((xfs_extnum_t)((1ULL << 15) - 1))
/*
* When we upgrade an inode to the large extent counts, the maximum value by
* which the extent count can increase is bound by the change in size of the
* on-disk field. No upgrade operation should ever be adding more than a few
* tens of extents, so if we get a really large value it is a sign of a code bug
* or corruption.
*/
#define XFS_MAX_EXTCNT_UPGRADE_NR \
min(XFS_MAX_EXTCNT_ATTR_FORK_LARGE - XFS_MAX_EXTCNT_ATTR_FORK_SMALL, \
XFS_MAX_EXTCNT_DATA_FORK_LARGE - XFS_MAX_EXTCNT_DATA_FORK_SMALL)
/*
* 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_DINODE_SIZE(mp) \
(xfs_has_v3inodes(mp) ? \
sizeof(struct xfs_dinode) : \
offsetof(struct xfs_dinode, di_crc))
#define XFS_LITINO(mp) \
((mp)->m_sb.sb_inodesize - XFS_DINODE_SIZE(mp))
/*
* Inode data & attribute fork sizes, per inode.
*/
#define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3))
#define XFS_DFORK_DSIZE(dip,mp) \
((dip)->di_forkoff ? XFS_DFORK_BOFF(dip) : XFS_LITINO(mp))
#define XFS_DFORK_ASIZE(dip,mp) \
((dip)->di_forkoff ? XFS_LITINO(mp) - 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)
/*
* 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_BIGTIME_BIT 3 /* big timestamps */
#define XFS_DIFLAG2_NREXT64_BIT 4 /* large extent counters */
#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_BIGTIME (1 << XFS_DIFLAG2_BIGTIME_BIT)
#define XFS_DIFLAG2_NREXT64 (1 << XFS_DIFLAG2_NREXT64_BIT)
#define XFS_DIFLAG2_ANY \
(XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE | \
XFS_DIFLAG2_BIGTIME | XFS_DIFLAG2_NREXT64)
static inline bool xfs_dinode_has_bigtime(const struct xfs_dinode *dip)
{
return dip->di_version >= 3 &&
(dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_BIGTIME));
}
static inline bool xfs_dinode_has_large_extent_counts(
const struct xfs_dinode *dip)
{
return dip->di_version >= 3 &&
(dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_NREXT64));
}
/*
* 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_ino_geo.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_FSB_TO_INO(mp, b) ((xfs_ino_t)((b) << XFS_INO_OFFSET_BITS(mp)))
#define XFS_AGB_TO_AGINO(mp, b) ((xfs_agino_t)((b) << XFS_INO_OFFSET_BITS(mp)))
#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 */
#define XFS_DQTYPE_USER (1u << 0) /* user dquot record */
#define XFS_DQTYPE_PROJ (1u << 1) /* project dquot record */
#define XFS_DQTYPE_GROUP (1u << 2) /* group dquot record */
#define XFS_DQTYPE_BIGTIME (1u << 7) /* large expiry timestamps */
/* bitmask to determine if this is a user/group/project dquot */
#define XFS_DQTYPE_REC_MASK (XFS_DQTYPE_USER | \
XFS_DQTYPE_PROJ | \
XFS_DQTYPE_GROUP)
#define XFS_DQTYPE_ANY (XFS_DQTYPE_REC_MASK | \
XFS_DQTYPE_BIGTIME)
/*
* XFS Quota Timers
* ================
*
* Traditional quota grace period expiration timers are an unsigned 32-bit
* seconds counter; time zero is the Unix epoch, Jan 1 00:00:01 UTC 1970.
* Note that an expiration value of zero means that the quota limit has not
* been reached, and therefore no expiration has been set. Therefore, the
* ondisk min and max defined here can be used directly to constrain the incore
* quota expiration timestamps on a Unix system.
*
* When bigtime is enabled, we trade two bits of precision to expand the
* expiration timeout range to match that of big inode timestamps. The min and
* max recorded here are the on-disk limits, not a Unix timestamp.
*
* The grace period for each quota type is stored in the root dquot (id = 0)
* and is applied to a non-root dquot when it exceeds the soft or hard limits.
* The length of quota grace periods are unsigned 32-bit quantities measured in
* units of seconds. A value of zero means to use the default period.
*/
/*
* Smallest possible ondisk quota expiration value with traditional timestamps.
* This corresponds exactly with the incore expiration Jan 1 00:00:01 UTC 1970.
*/
#define XFS_DQ_LEGACY_EXPIRY_MIN ((int64_t)1)
/*
* Largest possible ondisk quota expiration value with traditional timestamps.
* This corresponds exactly with the incore expiration Feb 7 06:28:15 UTC 2106.
*/
#define XFS_DQ_LEGACY_EXPIRY_MAX ((int64_t)U32_MAX)
/*
* Smallest possible ondisk quota expiration value with bigtime timestamps.
* This corresponds (after conversion to a Unix timestamp) with the incore
* expiration of Jan 1 00:00:04 UTC 1970.
*/
#define XFS_DQ_BIGTIME_EXPIRY_MIN (XFS_DQ_LEGACY_EXPIRY_MIN)
/*
* Largest supported ondisk quota expiration value with bigtime timestamps.
* This corresponds (after conversion to a Unix timestamp) with an incore
* expiration of Jul 2 20:20:24 UTC 2486.
*
* The ondisk field supports values up to -1U, which corresponds to an incore
* expiration in 2514. This is beyond the maximum the bigtime inode timestamp,
* so we cap the maximum bigtime quota expiration to the max inode timestamp.
*/
#define XFS_DQ_BIGTIME_EXPIRY_MAX ((int64_t)4074815106U)
/*
* The following conversion factors assist in converting a quota expiration
* timestamp between the incore and ondisk formats.
*/
#define XFS_DQ_BIGTIME_SHIFT (2)
#define XFS_DQ_BIGTIME_SLACK ((int64_t)(1ULL << XFS_DQ_BIGTIME_SHIFT) - 1)
/* Convert an incore quota expiration timestamp to an ondisk bigtime value. */
static inline uint32_t xfs_dq_unix_to_bigtime(time64_t unix_seconds)
{
/*
* Round the expiration timestamp up to the nearest bigtime timestamp
* that we can store, to give users the most time to fix problems.
*/
return ((uint64_t)unix_seconds + XFS_DQ_BIGTIME_SLACK) >>
XFS_DQ_BIGTIME_SHIFT;
}
/* Convert an ondisk bigtime quota expiration value to an incore timestamp. */
static inline time64_t xfs_dq_bigtime_to_unix(uint32_t ondisk_seconds)
{
return (time64_t)ondisk_seconds << XFS_DQ_BIGTIME_SHIFT;
}
/*
* Default quota grace periods, ranging from zero (use the compiled defaults)
* to ~136 years. These are applied to a non-root dquot that has exceeded
* either limit.
*/
#define XFS_DQ_GRACE_MIN ((int64_t)0)
#define XFS_DQ_GRACE_MAX ((int64_t)U32_MAX)
/*
* This is the main portion of the on-disk representation of quota information
* for a user. We pad this with some more expansion room to construct the on
* disk structure.
*/
struct xfs_disk_dquot {
__be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */
__u8 d_version; /* dquot version */
__u8 d_type; /* XFS_DQTYPE_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;
};
/*
* 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.
*/
struct xfs_dqblk {
struct xfs_disk_dquot dd_diskdq; /* portion living 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 */
};
#define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc)
/*
* This defines the unit of allocation of dquots.
*
* Currently, it is just one file system block, and a 4K blk contains 30
* (136 * 30 = 4080) dquots. It's probably not worth trying to make
* this more dynamic.
*
* However, if this number is changed, we have to make sure that we don't
* implicitly assume that we do allocations in chunks of a single filesystem
* block in the dquot/xqm code.
*
* This is part of the ondisk format because the structure size is not a power
* of two, which leaves slack at the end of the disk block.
*/
#define XFS_DQUOT_CLUSTER_SIZE_FSB (xfs_filblks_t)1
/*
* 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_has_crc((mp)) ? \
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
/*
* 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_has_finobt(((mp))) ? \
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_COWFLAG (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 */
};
#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)
#define BMBT_BLOCKCOUNT_MASK ((1ULL << BMBT_BLOCKCOUNT_BITLEN) - 1)
#define XFS_MAX_BMBT_EXTLEN ((xfs_extlen_t)(BMBT_BLOCKCOUNT_MASK))
/*
* bmbt records have a file offset (block) field that is 54 bits wide, so this
* is the largest xfs_fileoff_t that we ever expect to see.
*/
#define XFS_MAX_FILEOFF (BMBT_STARTOFF_MASK + BMBT_BLOCKCOUNT_MASK)
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[];
};
/*
* 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_has_crc(mp) \
? (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__ */