/* 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.
*/
/* * 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 */
/* Maximum size of the xfs filesystem label, no terminating NULL */ #define XFSLABEL_MAX 12
/* * Superblock - in core version. Must be padded to 64 bit alignment.
*/ typedefstruct 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_rtbxlen_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] __nonstring; /* 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;
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 */
xfs_ino_t sb_metadirino; /* metadata directory tree root */
xfs_rgnumber_t sb_rgcount; /* number of realtime groups */
xfs_rtxlen_t sb_rgextents; /* size of a realtime group in rtx */
uint8_t sb_rgblklog; /* rt group number shift */
uint8_t sb_pad[7]; /* zeroes */
xfs_rfsblock_t sb_rtstart; /* start of internal RT section (FSB) */
xfs_filblks_t sb_rtreserved; /* reserved (zoned) RT blocks */
/* must be padded to 64 bit alignment */
} xfs_sb_t;
/* * Superblock - on disk version. * 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;
__be64 sb_pquotino; /* project quota inode */
__be64 sb_lsn; /* last write sequence */
uuid_t sb_meta_uuid; /* metadata file system unique id */
__be64 sb_metadirino; /* metadata directory tree root */
__be32 sb_rgcount; /* # of realtime groups */
__be32 sb_rgextents; /* size of rtgroup in rtx */
__u8 sb_rgblklog; /* rt group number shift */
__u8 sb_pad[7]; /* zeroes */
__be64 sb_rtstart; /* start of internal RT section (FSB) */
__be64 sb_rtreserved; /* reserved (zoned) RT blocks */
/* * The size of this structure must be padded to 64 bit alignment. * * NOTE: Don't forget to update secondary_sb_whack in xfs_repair when * adding new fields here.
*/
};
/* * 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
/* * Detect a mismatched features2 field. Older kernels read/wrote * this into the wrong slot, so to be safe we keep them in sync.
*/ staticinlinebool xfs_sb_has_mismatched_features2(conststruct xfs_sb *sbp)
{ return sbp->sb_bad_features2 != sbp->sb_features2;
}
/* * 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 staticinlinebool
xfs_sb_has_compat_feature( conststruct xfs_sb *sbp,
uint32_t feature)
{ return (sbp->sb_features_compat & feature) != 0;
}
/* * 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
/* * agf_cnt_level in the first AGF 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.
*/
typedefstruct 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_bno_root; /* bnobt root block */
__be32 agf_cnt_root; /* cntbt root block */
__be32 agf_rmap_root; /* rmapbt root block */
__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 */
/* * 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;
/* 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
typedefstruct 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;
/* 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))
/* * 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)))
/* * Realtime bitmap information is accessed by the word, which is currently * stored in host-endian format. Starting with the realtime groups feature, * the words are stored in be32 ondisk.
*/ union xfs_rtword_raw {
__u32 old;
__be32 rtg;
};
/* * Realtime summary counts are accessed by the word, which is currently * stored in host-endian format. Starting with the realtime groups feature, * the words are stored in be32 ondisk.
*/ union xfs_suminfo_raw {
__u32 old;
__be32 rtg;
};
/* * Realtime allocation groups break the rt section into multiple pieces that * could be locked independently. Realtime block group numbers are 32-bit * quantities. Block numbers within a group are also 32-bit quantities, but * the upper bit must never be set. rtgroup 0 might have a superblock in it, * so the minimum size of an rtgroup is 2 rtx.
*/ #define XFS_MAX_RGBLOCKS ((xfs_rgblock_t)(1U << 31) - 1) #define XFS_MIN_RGEXTENTS ((xfs_rtxlen_t)2) #define XFS_MAX_RGNUMBER ((xfs_rgnumber_t)(-1U))
#define XFS_RTSB_MAGIC 0x46726F67 /* 'Frog' */
/* * Realtime superblock - on disk version. Must be padded to 64 bit alignment. * The first block of the realtime volume contains this superblock.
*/ struct xfs_rtsb {
__be32 rsb_magicnum; /* magic number == XFS_RTSB_MAGIC */
__le32 rsb_crc; /* superblock crc */
__be32 rsb_pad; /* zero */ unsignedchar rsb_fname[XFSLABEL_MAX]; /* file system name */
uuid_t rsb_uuid; /* user-visible file system unique id */
uuid_t rsb_meta_uuid; /* metadata file system unique id */
/* * 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;
/* * 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. */ staticinline 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. */ staticinline 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_metatype; /* XFS_METAFILE_*; was di_onlink */
__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 */ union { /* basic cow extent size for (regular) file */
__be32 di_cowextsize; /* used blocks in RTG for (zoned) rtrmap inode */
__be32 di_used_blocks;
};
__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 */
};
/* * 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.
*/ staticinline uint xfs_dinode_size(int version)
{ if (version == 3) returnsizeof(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)
/* * Any file that hits the maximum ondisk link count should be pinned to avoid * a use-after-free situation.
*/ #define XFS_NLINK_PINNED (~0U)
/* * 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 */
XFS_DINODE_FMT_META_BTREE, /* metadata btree */
};
/* * 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)
/* * For block and character special files the 32bit dev_t is stored at the * beginning of the data fork.
*/ staticinline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
{ return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
}
/* * 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 */
/* * Values for di_flags2 These start by being exposed to userspace in the upper * 16 bits of the XFS_XFLAG_s range.
*/ /* use DAX for this inode */ #define XFS_DIFLAG2_DAX_BIT 0
/* file's blocks may be shared */ #define XFS_DIFLAG2_REFLINK_BIT 1
/* copy on write extent size hint */ #define XFS_DIFLAG2_COWEXTSIZE_BIT 2
/* big timestamps */ #define XFS_DIFLAG2_BIGTIME_BIT 3
/* large extent counters */ #define XFS_DIFLAG2_NREXT64_BIT 4
/* * The inode contains filesystem metadata and can be found through the metadata * directory tree. Metadata inodes must satisfy the following constraints: * * - V5 filesystem (and ftype) are enabled; * - The only valid modes are regular files and directories; * - The access bits must be zero; * - DMAPI event and state masks are zero; * - The user and group IDs must be zero; * - The project ID can be used as a u32 annotation; * - The immutable, sync, noatime, nodump, nodefrag flags must be set. * - The dax flag must not be set. * - Directories must have nosymlinks set. * * These requirements are chosen defensively to minimize the ability of * userspace to read or modify the contents, should a metadata file ever * escape to userspace. * * There are further constraints on the directory tree itself: * * - Metadata inodes must never be resolvable through the root directory; * - They must never be accessed by userspace; * - Metadata directory entries must have correct ftype. * * Superblock-rooted metadata files must have the METADATA iflag set even * though they do not have a parent directory.
*/ #define XFS_DIFLAG2_METADATA_BIT 5
struct xfs_rtbuf_blkinfo {
__be32 rt_magic; /* validity check on block */
__be32 rt_crc; /* CRC of block */
__be64 rt_owner; /* inode that owns the block */
__be64 rt_blkno; /* first block of the buffer */
__be64 rt_lsn; /* sequence number of last write */
uuid_t rt_uuid; /* filesystem we belong to */
};
/* * 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)
/* * 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. */ staticinline 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. */ staticinline 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)
/* Maximum id value for a quota record */ #define XFS_DQ_ID_MAX (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 */
};
/* * 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 */
#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
/* * 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
*/ typedefstruct xfs_alloc_rec {
__be32 ar_startblock; /* starting block number */
__be32 ar_blockcount; /* count of free blocks */
} xfs_alloc_rec_t, xfs_alloc_key_t;
typedefstruct 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' */
staticinline 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.
*/ typedefstruct 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;
/* 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; unsignedint 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 */
/* * 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)
/* * Realtime Reverse mapping btree format definitions * * This is a btree for reverse mapping records for realtime volumes
*/ #define XFS_RTRMAP_CRC_MAGIC 0x4d415052 /* 'MAPR' */
/* * rtrmap root header, on-disk form only.
*/ struct xfs_rtrmap_root {
__be16 bb_level; /* 0 is a leaf */
__be16 bb_numrecs; /* current # of data records */
};
/* inode-based btree pointer type */ typedef __be64 xfs_rtrmap_ptr_t;
/* * 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 */
};
/* btree pointer type */ typedef __be32 xfs_refcount_ptr_t;
/* * Realtime Reference Count btree format definitions * * This is a btree for reference count records for realtime volumes
*/ #define XFS_RTREFC_CRC_MAGIC 0x52434e54 /* 'RCNT' */
/* * rt refcount root header, on-disk form only.
*/ struct xfs_rtrefcount_root {
__be16 bb_level; /* 0 is a leaf */
__be16 bb_numrecs; /* current # of data records */
};
/* inode-rooted btree pointer type */ typedef __be64 xfs_rtrefcount_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.
*/ typedefstruct 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.
--> --------------------
--> maximum size reached
--> --------------------
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