cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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xfs_format.h (64673B)


      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
      4 * All Rights Reserved.
      5 */
      6#ifndef __XFS_FORMAT_H__
      7#define __XFS_FORMAT_H__
      8
      9/*
     10 * XFS On Disk Format Definitions
     11 *
     12 * This header file defines all the on-disk format definitions for
     13 * general XFS objects. Directory and attribute related objects are defined in
     14 * xfs_da_format.h, which log and log item formats are defined in
     15 * xfs_log_format.h. Everything else goes here.
     16 */
     17
     18struct xfs_mount;
     19struct xfs_trans;
     20struct xfs_inode;
     21struct xfs_buf;
     22struct xfs_ifork;
     23
     24/*
     25 * Super block
     26 * Fits into a sector-sized buffer at address 0 of each allocation group.
     27 * Only the first of these is ever updated except during growfs.
     28 */
     29#define	XFS_SB_MAGIC		0x58465342	/* 'XFSB' */
     30#define	XFS_SB_VERSION_1	1		/* 5.3, 6.0.1, 6.1 */
     31#define	XFS_SB_VERSION_2	2		/* 6.2 - attributes */
     32#define	XFS_SB_VERSION_3	3		/* 6.2 - new inode version */
     33#define	XFS_SB_VERSION_4	4		/* 6.2+ - bitmask version */
     34#define	XFS_SB_VERSION_5	5		/* CRC enabled filesystem */
     35#define	XFS_SB_VERSION_NUMBITS		0x000f
     36#define	XFS_SB_VERSION_ALLFBITS		0xfff0
     37#define	XFS_SB_VERSION_ATTRBIT		0x0010
     38#define	XFS_SB_VERSION_NLINKBIT		0x0020
     39#define	XFS_SB_VERSION_QUOTABIT		0x0040
     40#define	XFS_SB_VERSION_ALIGNBIT		0x0080
     41#define	XFS_SB_VERSION_DALIGNBIT	0x0100
     42#define	XFS_SB_VERSION_SHAREDBIT	0x0200
     43#define XFS_SB_VERSION_LOGV2BIT		0x0400
     44#define XFS_SB_VERSION_SECTORBIT	0x0800
     45#define	XFS_SB_VERSION_EXTFLGBIT	0x1000
     46#define	XFS_SB_VERSION_DIRV2BIT		0x2000
     47#define	XFS_SB_VERSION_BORGBIT		0x4000	/* ASCII only case-insens. */
     48#define	XFS_SB_VERSION_MOREBITSBIT	0x8000
     49
     50/*
     51 * The size of a single extended attribute on disk is limited by
     52 * the size of index values within the attribute entries themselves.
     53 * These are be16 fields, so we can only support attribute data
     54 * sizes up to 2^16 bytes in length.
     55 */
     56#define XFS_XATTR_SIZE_MAX (1 << 16)
     57
     58/*
     59 * Supported feature bit list is just all bits in the versionnum field because
     60 * we've used them all up and understand them all. Except, of course, for the
     61 * shared superblock bit, which nobody knows what it does and so is unsupported.
     62 */
     63#define	XFS_SB_VERSION_OKBITS		\
     64	((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \
     65		~XFS_SB_VERSION_SHAREDBIT)
     66
     67/*
     68 * There are two words to hold XFS "feature" bits: the original
     69 * word, sb_versionnum, and sb_features2.  Whenever a bit is set in
     70 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
     71 *
     72 * These defines represent bits in sb_features2.
     73 */
     74#define XFS_SB_VERSION2_RESERVED1BIT	0x00000001
     75#define XFS_SB_VERSION2_LAZYSBCOUNTBIT	0x00000002	/* Superblk counters */
     76#define XFS_SB_VERSION2_RESERVED4BIT	0x00000004
     77#define XFS_SB_VERSION2_ATTR2BIT	0x00000008	/* Inline attr rework */
     78#define XFS_SB_VERSION2_PARENTBIT	0x00000010	/* parent pointers */
     79#define XFS_SB_VERSION2_PROJID32BIT	0x00000080	/* 32 bit project id */
     80#define XFS_SB_VERSION2_CRCBIT		0x00000100	/* metadata CRCs */
     81#define XFS_SB_VERSION2_FTYPE		0x00000200	/* inode type in dir */
     82
     83#define	XFS_SB_VERSION2_OKBITS		\
     84	(XFS_SB_VERSION2_LAZYSBCOUNTBIT	| \
     85	 XFS_SB_VERSION2_ATTR2BIT	| \
     86	 XFS_SB_VERSION2_PROJID32BIT	| \
     87	 XFS_SB_VERSION2_FTYPE)
     88
     89/* Maximum size of the xfs filesystem label, no terminating NULL */
     90#define XFSLABEL_MAX			12
     91
     92/*
     93 * Superblock - in core version.  Must match the ondisk version below.
     94 * Must be padded to 64 bit alignment.
     95 */
     96typedef struct xfs_sb {
     97	uint32_t	sb_magicnum;	/* magic number == XFS_SB_MAGIC */
     98	uint32_t	sb_blocksize;	/* logical block size, bytes */
     99	xfs_rfsblock_t	sb_dblocks;	/* number of data blocks */
    100	xfs_rfsblock_t	sb_rblocks;	/* number of realtime blocks */
    101	xfs_rtblock_t	sb_rextents;	/* number of realtime extents */
    102	uuid_t		sb_uuid;	/* user-visible file system unique id */
    103	xfs_fsblock_t	sb_logstart;	/* starting block of log if internal */
    104	xfs_ino_t	sb_rootino;	/* root inode number */
    105	xfs_ino_t	sb_rbmino;	/* bitmap inode for realtime extents */
    106	xfs_ino_t	sb_rsumino;	/* summary inode for rt bitmap */
    107	xfs_agblock_t	sb_rextsize;	/* realtime extent size, blocks */
    108	xfs_agblock_t	sb_agblocks;	/* size of an allocation group */
    109	xfs_agnumber_t	sb_agcount;	/* number of allocation groups */
    110	xfs_extlen_t	sb_rbmblocks;	/* number of rt bitmap blocks */
    111	xfs_extlen_t	sb_logblocks;	/* number of log blocks */
    112	uint16_t	sb_versionnum;	/* header version == XFS_SB_VERSION */
    113	uint16_t	sb_sectsize;	/* volume sector size, bytes */
    114	uint16_t	sb_inodesize;	/* inode size, bytes */
    115	uint16_t	sb_inopblock;	/* inodes per block */
    116	char		sb_fname[XFSLABEL_MAX]; /* file system name */
    117	uint8_t		sb_blocklog;	/* log2 of sb_blocksize */
    118	uint8_t		sb_sectlog;	/* log2 of sb_sectsize */
    119	uint8_t		sb_inodelog;	/* log2 of sb_inodesize */
    120	uint8_t		sb_inopblog;	/* log2 of sb_inopblock */
    121	uint8_t		sb_agblklog;	/* log2 of sb_agblocks (rounded up) */
    122	uint8_t		sb_rextslog;	/* log2 of sb_rextents */
    123	uint8_t		sb_inprogress;	/* mkfs is in progress, don't mount */
    124	uint8_t		sb_imax_pct;	/* max % of fs for inode space */
    125					/* statistics */
    126	/*
    127	 * These fields must remain contiguous.  If you really
    128	 * want to change their layout, make sure you fix the
    129	 * code in xfs_trans_apply_sb_deltas().
    130	 */
    131	uint64_t	sb_icount;	/* allocated inodes */
    132	uint64_t	sb_ifree;	/* free inodes */
    133	uint64_t	sb_fdblocks;	/* free data blocks */
    134	uint64_t	sb_frextents;	/* free realtime extents */
    135	/*
    136	 * End contiguous fields.
    137	 */
    138	xfs_ino_t	sb_uquotino;	/* user quota inode */
    139	xfs_ino_t	sb_gquotino;	/* group quota inode */
    140	uint16_t	sb_qflags;	/* quota flags */
    141	uint8_t		sb_flags;	/* misc. flags */
    142	uint8_t		sb_shared_vn;	/* shared version number */
    143	xfs_extlen_t	sb_inoalignmt;	/* inode chunk alignment, fsblocks */
    144	uint32_t	sb_unit;	/* stripe or raid unit */
    145	uint32_t	sb_width;	/* stripe or raid width */
    146	uint8_t		sb_dirblklog;	/* log2 of dir block size (fsbs) */
    147	uint8_t		sb_logsectlog;	/* log2 of the log sector size */
    148	uint16_t	sb_logsectsize;	/* sector size for the log, bytes */
    149	uint32_t	sb_logsunit;	/* stripe unit size for the log */
    150	uint32_t	sb_features2;	/* additional feature bits */
    151
    152	/*
    153	 * bad features2 field as a result of failing to pad the sb structure to
    154	 * 64 bits. Some machines will be using this field for features2 bits.
    155	 * Easiest just to mark it bad and not use it for anything else.
    156	 *
    157	 * This is not kept up to date in memory; it is always overwritten by
    158	 * the value in sb_features2 when formatting the incore superblock to
    159	 * the disk buffer.
    160	 */
    161	uint32_t	sb_bad_features2;
    162
    163	/* version 5 superblock fields start here */
    164
    165	/* feature masks */
    166	uint32_t	sb_features_compat;
    167	uint32_t	sb_features_ro_compat;
    168	uint32_t	sb_features_incompat;
    169	uint32_t	sb_features_log_incompat;
    170
    171	uint32_t	sb_crc;		/* superblock crc */
    172	xfs_extlen_t	sb_spino_align;	/* sparse inode chunk alignment */
    173
    174	xfs_ino_t	sb_pquotino;	/* project quota inode */
    175	xfs_lsn_t	sb_lsn;		/* last write sequence */
    176	uuid_t		sb_meta_uuid;	/* metadata file system unique id */
    177
    178	/* must be padded to 64 bit alignment */
    179} xfs_sb_t;
    180
    181#define XFS_SB_CRC_OFF		offsetof(struct xfs_sb, sb_crc)
    182
    183/*
    184 * Superblock - on disk version.  Must match the in core version above.
    185 * Must be padded to 64 bit alignment.
    186 */
    187struct xfs_dsb {
    188	__be32		sb_magicnum;	/* magic number == XFS_SB_MAGIC */
    189	__be32		sb_blocksize;	/* logical block size, bytes */
    190	__be64		sb_dblocks;	/* number of data blocks */
    191	__be64		sb_rblocks;	/* number of realtime blocks */
    192	__be64		sb_rextents;	/* number of realtime extents */
    193	uuid_t		sb_uuid;	/* user-visible file system unique id */
    194	__be64		sb_logstart;	/* starting block of log if internal */
    195	__be64		sb_rootino;	/* root inode number */
    196	__be64		sb_rbmino;	/* bitmap inode for realtime extents */
    197	__be64		sb_rsumino;	/* summary inode for rt bitmap */
    198	__be32		sb_rextsize;	/* realtime extent size, blocks */
    199	__be32		sb_agblocks;	/* size of an allocation group */
    200	__be32		sb_agcount;	/* number of allocation groups */
    201	__be32		sb_rbmblocks;	/* number of rt bitmap blocks */
    202	__be32		sb_logblocks;	/* number of log blocks */
    203	__be16		sb_versionnum;	/* header version == XFS_SB_VERSION */
    204	__be16		sb_sectsize;	/* volume sector size, bytes */
    205	__be16		sb_inodesize;	/* inode size, bytes */
    206	__be16		sb_inopblock;	/* inodes per block */
    207	char		sb_fname[XFSLABEL_MAX]; /* file system name */
    208	__u8		sb_blocklog;	/* log2 of sb_blocksize */
    209	__u8		sb_sectlog;	/* log2 of sb_sectsize */
    210	__u8		sb_inodelog;	/* log2 of sb_inodesize */
    211	__u8		sb_inopblog;	/* log2 of sb_inopblock */
    212	__u8		sb_agblklog;	/* log2 of sb_agblocks (rounded up) */
    213	__u8		sb_rextslog;	/* log2 of sb_rextents */
    214	__u8		sb_inprogress;	/* mkfs is in progress, don't mount */
    215	__u8		sb_imax_pct;	/* max % of fs for inode space */
    216					/* statistics */
    217	/*
    218	 * These fields must remain contiguous.  If you really
    219	 * want to change their layout, make sure you fix the
    220	 * code in xfs_trans_apply_sb_deltas().
    221	 */
    222	__be64		sb_icount;	/* allocated inodes */
    223	__be64		sb_ifree;	/* free inodes */
    224	__be64		sb_fdblocks;	/* free data blocks */
    225	__be64		sb_frextents;	/* free realtime extents */
    226	/*
    227	 * End contiguous fields.
    228	 */
    229	__be64		sb_uquotino;	/* user quota inode */
    230	__be64		sb_gquotino;	/* group quota inode */
    231	__be16		sb_qflags;	/* quota flags */
    232	__u8		sb_flags;	/* misc. flags */
    233	__u8		sb_shared_vn;	/* shared version number */
    234	__be32		sb_inoalignmt;	/* inode chunk alignment, fsblocks */
    235	__be32		sb_unit;	/* stripe or raid unit */
    236	__be32		sb_width;	/* stripe or raid width */
    237	__u8		sb_dirblklog;	/* log2 of dir block size (fsbs) */
    238	__u8		sb_logsectlog;	/* log2 of the log sector size */
    239	__be16		sb_logsectsize;	/* sector size for the log, bytes */
    240	__be32		sb_logsunit;	/* stripe unit size for the log */
    241	__be32		sb_features2;	/* additional feature bits */
    242	/*
    243	 * bad features2 field as a result of failing to pad the sb
    244	 * structure to 64 bits. Some machines will be using this field
    245	 * for features2 bits. Easiest just to mark it bad and not use
    246	 * it for anything else.
    247	 */
    248	__be32		sb_bad_features2;
    249
    250	/* version 5 superblock fields start here */
    251
    252	/* feature masks */
    253	__be32		sb_features_compat;
    254	__be32		sb_features_ro_compat;
    255	__be32		sb_features_incompat;
    256	__be32		sb_features_log_incompat;
    257
    258	__le32		sb_crc;		/* superblock crc */
    259	__be32		sb_spino_align;	/* sparse inode chunk alignment */
    260
    261	__be64		sb_pquotino;	/* project quota inode */
    262	__be64		sb_lsn;		/* last write sequence */
    263	uuid_t		sb_meta_uuid;	/* metadata file system unique id */
    264
    265	/* must be padded to 64 bit alignment */
    266};
    267
    268/*
    269 * Misc. Flags - warning - these will be cleared by xfs_repair unless
    270 * a feature bit is set when the flag is used.
    271 */
    272#define XFS_SBF_NOFLAGS		0x00	/* no flags set */
    273#define XFS_SBF_READONLY	0x01	/* only read-only mounts allowed */
    274
    275/*
    276 * define max. shared version we can interoperate with
    277 */
    278#define XFS_SB_MAX_SHARED_VN	0
    279
    280#define	XFS_SB_VERSION_NUM(sbp)	((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
    281
    282static inline bool xfs_sb_is_v5(struct xfs_sb *sbp)
    283{
    284	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
    285}
    286
    287/*
    288 * Detect a mismatched features2 field.  Older kernels read/wrote
    289 * this into the wrong slot, so to be safe we keep them in sync.
    290 */
    291static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp)
    292{
    293	return sbp->sb_bad_features2 != sbp->sb_features2;
    294}
    295
    296static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp)
    297{
    298	return xfs_sb_is_v5(sbp) ||
    299	       (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
    300}
    301
    302static inline void xfs_sb_version_addattr(struct xfs_sb *sbp)
    303{
    304	sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
    305}
    306
    307static inline void xfs_sb_version_addquota(struct xfs_sb *sbp)
    308{
    309	sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
    310}
    311
    312static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp)
    313{
    314	sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
    315	sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
    316}
    317
    318static inline void xfs_sb_version_addprojid32(struct xfs_sb *sbp)
    319{
    320	sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
    321	sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT;
    322}
    323
    324/*
    325 * Extended v5 superblock feature masks. These are to be used for new v5
    326 * superblock features only.
    327 *
    328 * Compat features are new features that old kernels will not notice or affect
    329 * and so can mount read-write without issues.
    330 *
    331 * RO-Compat (read only) are features that old kernels can read but will break
    332 * if they write. Hence only read-only mounts of such filesystems are allowed on
    333 * kernels that don't support the feature bit.
    334 *
    335 * InCompat features are features which old kernels will not understand and so
    336 * must not mount.
    337 *
    338 * Log-InCompat features are for changes to log formats or new transactions that
    339 * can't be replayed on older kernels. The fields are set when the filesystem is
    340 * mounted, and a clean unmount clears the fields.
    341 */
    342#define XFS_SB_FEAT_COMPAT_ALL 0
    343#define XFS_SB_FEAT_COMPAT_UNKNOWN	~XFS_SB_FEAT_COMPAT_ALL
    344static inline bool
    345xfs_sb_has_compat_feature(
    346	struct xfs_sb	*sbp,
    347	uint32_t	feature)
    348{
    349	return (sbp->sb_features_compat & feature) != 0;
    350}
    351
    352#define XFS_SB_FEAT_RO_COMPAT_FINOBT   (1 << 0)		/* free inode btree */
    353#define XFS_SB_FEAT_RO_COMPAT_RMAPBT   (1 << 1)		/* reverse map btree */
    354#define XFS_SB_FEAT_RO_COMPAT_REFLINK  (1 << 2)		/* reflinked files */
    355#define XFS_SB_FEAT_RO_COMPAT_INOBTCNT (1 << 3)		/* inobt block counts */
    356#define XFS_SB_FEAT_RO_COMPAT_ALL \
    357		(XFS_SB_FEAT_RO_COMPAT_FINOBT | \
    358		 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
    359		 XFS_SB_FEAT_RO_COMPAT_REFLINK| \
    360		 XFS_SB_FEAT_RO_COMPAT_INOBTCNT)
    361#define XFS_SB_FEAT_RO_COMPAT_UNKNOWN	~XFS_SB_FEAT_RO_COMPAT_ALL
    362static inline bool
    363xfs_sb_has_ro_compat_feature(
    364	struct xfs_sb	*sbp,
    365	uint32_t	feature)
    366{
    367	return (sbp->sb_features_ro_compat & feature) != 0;
    368}
    369
    370#define XFS_SB_FEAT_INCOMPAT_FTYPE	(1 << 0)	/* filetype in dirent */
    371#define XFS_SB_FEAT_INCOMPAT_SPINODES	(1 << 1)	/* sparse inode chunks */
    372#define XFS_SB_FEAT_INCOMPAT_META_UUID	(1 << 2)	/* metadata UUID */
    373#define XFS_SB_FEAT_INCOMPAT_BIGTIME	(1 << 3)	/* large timestamps */
    374#define XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR (1 << 4)	/* needs xfs_repair */
    375#define XFS_SB_FEAT_INCOMPAT_NREXT64	(1 << 5)	/* large extent counters */
    376#define XFS_SB_FEAT_INCOMPAT_ALL \
    377		(XFS_SB_FEAT_INCOMPAT_FTYPE|	\
    378		 XFS_SB_FEAT_INCOMPAT_SPINODES|	\
    379		 XFS_SB_FEAT_INCOMPAT_META_UUID| \
    380		 XFS_SB_FEAT_INCOMPAT_BIGTIME| \
    381		 XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR| \
    382		 XFS_SB_FEAT_INCOMPAT_NREXT64)
    383
    384#define XFS_SB_FEAT_INCOMPAT_UNKNOWN	~XFS_SB_FEAT_INCOMPAT_ALL
    385static inline bool
    386xfs_sb_has_incompat_feature(
    387	struct xfs_sb	*sbp,
    388	uint32_t	feature)
    389{
    390	return (sbp->sb_features_incompat & feature) != 0;
    391}
    392
    393#define XFS_SB_FEAT_INCOMPAT_LOG_XATTRS   (1 << 0)	/* Delayed Attributes */
    394#define XFS_SB_FEAT_INCOMPAT_LOG_ALL \
    395	(XFS_SB_FEAT_INCOMPAT_LOG_XATTRS)
    396#define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN	~XFS_SB_FEAT_INCOMPAT_LOG_ALL
    397static inline bool
    398xfs_sb_has_incompat_log_feature(
    399	struct xfs_sb	*sbp,
    400	uint32_t	feature)
    401{
    402	return (sbp->sb_features_log_incompat & feature) != 0;
    403}
    404
    405static inline void
    406xfs_sb_remove_incompat_log_features(
    407	struct xfs_sb	*sbp)
    408{
    409	sbp->sb_features_log_incompat &= ~XFS_SB_FEAT_INCOMPAT_LOG_ALL;
    410}
    411
    412static inline void
    413xfs_sb_add_incompat_log_features(
    414	struct xfs_sb	*sbp,
    415	unsigned int	features)
    416{
    417	sbp->sb_features_log_incompat |= features;
    418}
    419
    420static inline bool xfs_sb_version_haslogxattrs(struct xfs_sb *sbp)
    421{
    422	return xfs_sb_is_v5(sbp) && (sbp->sb_features_log_incompat &
    423		 XFS_SB_FEAT_INCOMPAT_LOG_XATTRS);
    424}
    425
    426static inline bool
    427xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
    428{
    429	return (ino == sbp->sb_uquotino ||
    430		ino == sbp->sb_gquotino ||
    431		ino == sbp->sb_pquotino);
    432}
    433
    434#define XFS_SB_DADDR		((xfs_daddr_t)0) /* daddr in filesystem/ag */
    435#define	XFS_SB_BLOCK(mp)	XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
    436
    437#define	XFS_HDR_BLOCK(mp,d)	((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
    438#define	XFS_DADDR_TO_FSB(mp,d)	XFS_AGB_TO_FSB(mp, \
    439			xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
    440#define	XFS_FSB_TO_DADDR(mp,fsbno)	XFS_AGB_TO_DADDR(mp, \
    441			XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
    442
    443/*
    444 * File system sector to basic block conversions.
    445 */
    446#define XFS_FSS_TO_BB(mp,sec)	((sec) << (mp)->m_sectbb_log)
    447
    448/*
    449 * File system block to basic block conversions.
    450 */
    451#define	XFS_FSB_TO_BB(mp,fsbno)	((fsbno) << (mp)->m_blkbb_log)
    452#define	XFS_BB_TO_FSB(mp,bb)	\
    453	(((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
    454#define	XFS_BB_TO_FSBT(mp,bb)	((bb) >> (mp)->m_blkbb_log)
    455
    456/*
    457 * File system block to byte conversions.
    458 */
    459#define XFS_FSB_TO_B(mp,fsbno)	((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
    460#define XFS_B_TO_FSB(mp,b)	\
    461	((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
    462#define XFS_B_TO_FSBT(mp,b)	(((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
    463
    464/*
    465 * Allocation group header
    466 *
    467 * This is divided into three structures, placed in sequential 512-byte
    468 * buffers after a copy of the superblock (also in a 512-byte buffer).
    469 */
    470#define	XFS_AGF_MAGIC	0x58414746	/* 'XAGF' */
    471#define	XFS_AGI_MAGIC	0x58414749	/* 'XAGI' */
    472#define	XFS_AGFL_MAGIC	0x5841464c	/* 'XAFL' */
    473#define	XFS_AGF_VERSION	1
    474#define	XFS_AGI_VERSION	1
    475
    476#define	XFS_AGF_GOOD_VERSION(v)	((v) == XFS_AGF_VERSION)
    477#define	XFS_AGI_GOOD_VERSION(v)	((v) == XFS_AGI_VERSION)
    478
    479/*
    480 * Btree number 0 is bno, 1 is cnt, 2 is rmap. This value gives the size of the
    481 * arrays below.
    482 */
    483#define	XFS_BTNUM_AGF	((int)XFS_BTNUM_RMAPi + 1)
    484
    485/*
    486 * The second word of agf_levels in the first a.g. overlaps the EFS
    487 * superblock's magic number.  Since the magic numbers valid for EFS
    488 * are > 64k, our value cannot be confused for an EFS superblock's.
    489 */
    490
    491typedef struct xfs_agf {
    492	/*
    493	 * Common allocation group header information
    494	 */
    495	__be32		agf_magicnum;	/* magic number == XFS_AGF_MAGIC */
    496	__be32		agf_versionnum;	/* header version == XFS_AGF_VERSION */
    497	__be32		agf_seqno;	/* sequence # starting from 0 */
    498	__be32		agf_length;	/* size in blocks of a.g. */
    499	/*
    500	 * Freespace and rmap information
    501	 */
    502	__be32		agf_roots[XFS_BTNUM_AGF];	/* root blocks */
    503	__be32		agf_levels[XFS_BTNUM_AGF];	/* btree levels */
    504
    505	__be32		agf_flfirst;	/* first freelist block's index */
    506	__be32		agf_fllast;	/* last freelist block's index */
    507	__be32		agf_flcount;	/* count of blocks in freelist */
    508	__be32		agf_freeblks;	/* total free blocks */
    509
    510	__be32		agf_longest;	/* longest free space */
    511	__be32		agf_btreeblks;	/* # of blocks held in AGF btrees */
    512	uuid_t		agf_uuid;	/* uuid of filesystem */
    513
    514	__be32		agf_rmap_blocks;	/* rmapbt blocks used */
    515	__be32		agf_refcount_blocks;	/* refcountbt blocks used */
    516
    517	__be32		agf_refcount_root;	/* refcount tree root block */
    518	__be32		agf_refcount_level;	/* refcount btree levels */
    519
    520	/*
    521	 * reserve some contiguous space for future logged fields before we add
    522	 * the unlogged fields. This makes the range logging via flags and
    523	 * structure offsets much simpler.
    524	 */
    525	__be64		agf_spare64[14];
    526
    527	/* unlogged fields, written during buffer writeback. */
    528	__be64		agf_lsn;	/* last write sequence */
    529	__be32		agf_crc;	/* crc of agf sector */
    530	__be32		agf_spare2;
    531
    532	/* structure must be padded to 64 bit alignment */
    533} xfs_agf_t;
    534
    535#define XFS_AGF_CRC_OFF		offsetof(struct xfs_agf, agf_crc)
    536
    537#define	XFS_AGF_MAGICNUM	(1u << 0)
    538#define	XFS_AGF_VERSIONNUM	(1u << 1)
    539#define	XFS_AGF_SEQNO		(1u << 2)
    540#define	XFS_AGF_LENGTH		(1u << 3)
    541#define	XFS_AGF_ROOTS		(1u << 4)
    542#define	XFS_AGF_LEVELS		(1u << 5)
    543#define	XFS_AGF_FLFIRST		(1u << 6)
    544#define	XFS_AGF_FLLAST		(1u << 7)
    545#define	XFS_AGF_FLCOUNT		(1u << 8)
    546#define	XFS_AGF_FREEBLKS	(1u << 9)
    547#define	XFS_AGF_LONGEST		(1u << 10)
    548#define	XFS_AGF_BTREEBLKS	(1u << 11)
    549#define	XFS_AGF_UUID		(1u << 12)
    550#define	XFS_AGF_RMAP_BLOCKS	(1u << 13)
    551#define	XFS_AGF_REFCOUNT_BLOCKS	(1u << 14)
    552#define	XFS_AGF_REFCOUNT_ROOT	(1u << 15)
    553#define	XFS_AGF_REFCOUNT_LEVEL	(1u << 16)
    554#define	XFS_AGF_SPARE64		(1u << 17)
    555#define	XFS_AGF_NUM_BITS	18
    556#define	XFS_AGF_ALL_BITS	((1u << XFS_AGF_NUM_BITS) - 1)
    557
    558#define XFS_AGF_FLAGS \
    559	{ XFS_AGF_MAGICNUM,	"MAGICNUM" }, \
    560	{ XFS_AGF_VERSIONNUM,	"VERSIONNUM" }, \
    561	{ XFS_AGF_SEQNO,	"SEQNO" }, \
    562	{ XFS_AGF_LENGTH,	"LENGTH" }, \
    563	{ XFS_AGF_ROOTS,	"ROOTS" }, \
    564	{ XFS_AGF_LEVELS,	"LEVELS" }, \
    565	{ XFS_AGF_FLFIRST,	"FLFIRST" }, \
    566	{ XFS_AGF_FLLAST,	"FLLAST" }, \
    567	{ XFS_AGF_FLCOUNT,	"FLCOUNT" }, \
    568	{ XFS_AGF_FREEBLKS,	"FREEBLKS" }, \
    569	{ XFS_AGF_LONGEST,	"LONGEST" }, \
    570	{ XFS_AGF_BTREEBLKS,	"BTREEBLKS" }, \
    571	{ XFS_AGF_UUID,		"UUID" }, \
    572	{ XFS_AGF_RMAP_BLOCKS,	"RMAP_BLOCKS" }, \
    573	{ XFS_AGF_REFCOUNT_BLOCKS,	"REFCOUNT_BLOCKS" }, \
    574	{ XFS_AGF_REFCOUNT_ROOT,	"REFCOUNT_ROOT" }, \
    575	{ XFS_AGF_REFCOUNT_LEVEL,	"REFCOUNT_LEVEL" }, \
    576	{ XFS_AGF_SPARE64,	"SPARE64" }
    577
    578/* disk block (xfs_daddr_t) in the AG */
    579#define XFS_AGF_DADDR(mp)	((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
    580#define	XFS_AGF_BLOCK(mp)	XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
    581
    582/*
    583 * Size of the unlinked inode hash table in the agi.
    584 */
    585#define	XFS_AGI_UNLINKED_BUCKETS	64
    586
    587typedef struct xfs_agi {
    588	/*
    589	 * Common allocation group header information
    590	 */
    591	__be32		agi_magicnum;	/* magic number == XFS_AGI_MAGIC */
    592	__be32		agi_versionnum;	/* header version == XFS_AGI_VERSION */
    593	__be32		agi_seqno;	/* sequence # starting from 0 */
    594	__be32		agi_length;	/* size in blocks of a.g. */
    595	/*
    596	 * Inode information
    597	 * Inodes are mapped by interpreting the inode number, so no
    598	 * mapping data is needed here.
    599	 */
    600	__be32		agi_count;	/* count of allocated inodes */
    601	__be32		agi_root;	/* root of inode btree */
    602	__be32		agi_level;	/* levels in inode btree */
    603	__be32		agi_freecount;	/* number of free inodes */
    604
    605	__be32		agi_newino;	/* new inode just allocated */
    606	__be32		agi_dirino;	/* last directory inode chunk */
    607	/*
    608	 * Hash table of inodes which have been unlinked but are
    609	 * still being referenced.
    610	 */
    611	__be32		agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
    612	/*
    613	 * This marks the end of logging region 1 and start of logging region 2.
    614	 */
    615	uuid_t		agi_uuid;	/* uuid of filesystem */
    616	__be32		agi_crc;	/* crc of agi sector */
    617	__be32		agi_pad32;
    618	__be64		agi_lsn;	/* last write sequence */
    619
    620	__be32		agi_free_root; /* root of the free inode btree */
    621	__be32		agi_free_level;/* levels in free inode btree */
    622
    623	__be32		agi_iblocks;	/* inobt blocks used */
    624	__be32		agi_fblocks;	/* finobt blocks used */
    625
    626	/* structure must be padded to 64 bit alignment */
    627} xfs_agi_t;
    628
    629#define XFS_AGI_CRC_OFF		offsetof(struct xfs_agi, agi_crc)
    630
    631#define	XFS_AGI_MAGICNUM	(1u << 0)
    632#define	XFS_AGI_VERSIONNUM	(1u << 1)
    633#define	XFS_AGI_SEQNO		(1u << 2)
    634#define	XFS_AGI_LENGTH		(1u << 3)
    635#define	XFS_AGI_COUNT		(1u << 4)
    636#define	XFS_AGI_ROOT		(1u << 5)
    637#define	XFS_AGI_LEVEL		(1u << 6)
    638#define	XFS_AGI_FREECOUNT	(1u << 7)
    639#define	XFS_AGI_NEWINO		(1u << 8)
    640#define	XFS_AGI_DIRINO		(1u << 9)
    641#define	XFS_AGI_UNLINKED	(1u << 10)
    642#define	XFS_AGI_NUM_BITS_R1	11	/* end of the 1st agi logging region */
    643#define	XFS_AGI_ALL_BITS_R1	((1u << XFS_AGI_NUM_BITS_R1) - 1)
    644#define	XFS_AGI_FREE_ROOT	(1u << 11)
    645#define	XFS_AGI_FREE_LEVEL	(1u << 12)
    646#define	XFS_AGI_IBLOCKS		(1u << 13) /* both inobt/finobt block counters */
    647#define	XFS_AGI_NUM_BITS_R2	14
    648
    649/* disk block (xfs_daddr_t) in the AG */
    650#define XFS_AGI_DADDR(mp)	((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
    651#define	XFS_AGI_BLOCK(mp)	XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
    652
    653/*
    654 * The third a.g. block contains the a.g. freelist, an array
    655 * of block pointers to blocks owned by the allocation btree code.
    656 */
    657#define XFS_AGFL_DADDR(mp)	((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
    658#define	XFS_AGFL_BLOCK(mp)	XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
    659#define	XFS_BUF_TO_AGFL(bp)	((struct xfs_agfl *)((bp)->b_addr))
    660
    661struct xfs_agfl {
    662	__be32		agfl_magicnum;
    663	__be32		agfl_seqno;
    664	uuid_t		agfl_uuid;
    665	__be64		agfl_lsn;
    666	__be32		agfl_crc;
    667} __attribute__((packed));
    668
    669#define XFS_AGFL_CRC_OFF	offsetof(struct xfs_agfl, agfl_crc)
    670
    671#define XFS_AGB_TO_FSB(mp,agno,agbno)	\
    672	(((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
    673#define	XFS_FSB_TO_AGNO(mp,fsbno)	\
    674	((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
    675#define	XFS_FSB_TO_AGBNO(mp,fsbno)	\
    676	((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
    677#define	XFS_AGB_TO_DADDR(mp,agno,agbno)	\
    678	((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
    679		(xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
    680#define	XFS_AG_DADDR(mp,agno,d)		(XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
    681
    682/*
    683 * For checking for bad ranges of xfs_daddr_t's, covering multiple
    684 * allocation groups or a single xfs_daddr_t that's a superblock copy.
    685 */
    686#define	XFS_AG_CHECK_DADDR(mp,d,len)	\
    687	((len) == 1 ? \
    688	    ASSERT((d) == XFS_SB_DADDR || \
    689		   xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
    690	    ASSERT(xfs_daddr_to_agno(mp, d) == \
    691		   xfs_daddr_to_agno(mp, (d) + (len) - 1)))
    692
    693/*
    694 * XFS Timestamps
    695 * ==============
    696 *
    697 * Traditional ondisk inode timestamps consist of signed 32-bit counters for
    698 * seconds and nanoseconds; time zero is the Unix epoch, Jan  1 00:00:00 UTC
    699 * 1970, which means that the timestamp epoch is the same as the Unix epoch.
    700 * Therefore, the ondisk min and max defined here can be used directly to
    701 * constrain the incore timestamps on a Unix system.  Note that we actually
    702 * encode a __be64 value on disk.
    703 *
    704 * When the bigtime feature is enabled, ondisk inode timestamps become an
    705 * unsigned 64-bit nanoseconds counter.  This means that the bigtime inode
    706 * timestamp epoch is the start of the classic timestamp range, which is
    707 * Dec 31 20:45:52 UTC 1901.  Because the epochs are not the same, callers
    708 * /must/ use the bigtime conversion functions when encoding and decoding raw
    709 * timestamps.
    710 */
    711typedef __be64 xfs_timestamp_t;
    712
    713/* Legacy timestamp encoding format. */
    714struct xfs_legacy_timestamp {
    715	__be32		t_sec;		/* timestamp seconds */
    716	__be32		t_nsec;		/* timestamp nanoseconds */
    717};
    718
    719/*
    720 * Smallest possible ondisk seconds value with traditional timestamps.  This
    721 * corresponds exactly with the incore timestamp Dec 13 20:45:52 UTC 1901.
    722 */
    723#define XFS_LEGACY_TIME_MIN	((int64_t)S32_MIN)
    724
    725/*
    726 * Largest possible ondisk seconds value with traditional timestamps.  This
    727 * corresponds exactly with the incore timestamp Jan 19 03:14:07 UTC 2038.
    728 */
    729#define XFS_LEGACY_TIME_MAX	((int64_t)S32_MAX)
    730
    731/*
    732 * Smallest possible ondisk seconds value with bigtime timestamps.  This
    733 * corresponds (after conversion to a Unix timestamp) with the traditional
    734 * minimum timestamp of Dec 13 20:45:52 UTC 1901.
    735 */
    736#define XFS_BIGTIME_TIME_MIN	((int64_t)0)
    737
    738/*
    739 * Largest supported ondisk seconds value with bigtime timestamps.  This
    740 * corresponds (after conversion to a Unix timestamp) with an incore timestamp
    741 * of Jul  2 20:20:24 UTC 2486.
    742 *
    743 * We round down the ondisk limit so that the bigtime quota and inode max
    744 * timestamps will be the same.
    745 */
    746#define XFS_BIGTIME_TIME_MAX	((int64_t)((-1ULL / NSEC_PER_SEC) & ~0x3ULL))
    747
    748/*
    749 * Bigtime epoch is set exactly to the minimum time value that a traditional
    750 * 32-bit timestamp can represent when using the Unix epoch as a reference.
    751 * Hence the Unix epoch is at a fixed offset into the supported bigtime
    752 * timestamp range.
    753 *
    754 * The bigtime epoch also matches the minimum value an on-disk 32-bit XFS
    755 * timestamp can represent so we will not lose any fidelity in converting
    756 * to/from unix and bigtime timestamps.
    757 *
    758 * The following conversion factor converts a seconds counter from the Unix
    759 * epoch to the bigtime epoch.
    760 */
    761#define XFS_BIGTIME_EPOCH_OFFSET	(-(int64_t)S32_MIN)
    762
    763/* Convert a timestamp from the Unix epoch to the bigtime epoch. */
    764static inline uint64_t xfs_unix_to_bigtime(time64_t unix_seconds)
    765{
    766	return (uint64_t)unix_seconds + XFS_BIGTIME_EPOCH_OFFSET;
    767}
    768
    769/* Convert a timestamp from the bigtime epoch to the Unix epoch. */
    770static inline time64_t xfs_bigtime_to_unix(uint64_t ondisk_seconds)
    771{
    772	return (time64_t)ondisk_seconds - XFS_BIGTIME_EPOCH_OFFSET;
    773}
    774
    775/*
    776 * On-disk inode structure.
    777 *
    778 * This is just the header or "dinode core", the inode is expanded to fill a
    779 * variable size the leftover area split into a data and an attribute fork.
    780 * The format of the data and attribute fork depends on the format of the
    781 * inode as indicated by di_format and di_aformat.  To access the data and
    782 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros
    783 * below.
    784 *
    785 * There is a very similar struct xfs_log_dinode which matches the layout of
    786 * this structure, but is kept in native format instead of big endian.
    787 *
    788 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
    789 * padding field for v3 inodes.
    790 */
    791#define	XFS_DINODE_MAGIC		0x494e	/* 'IN' */
    792struct xfs_dinode {
    793	__be16		di_magic;	/* inode magic # = XFS_DINODE_MAGIC */
    794	__be16		di_mode;	/* mode and type of file */
    795	__u8		di_version;	/* inode version */
    796	__u8		di_format;	/* format of di_c data */
    797	__be16		di_onlink;	/* old number of links to file */
    798	__be32		di_uid;		/* owner's user id */
    799	__be32		di_gid;		/* owner's group id */
    800	__be32		di_nlink;	/* number of links to file */
    801	__be16		di_projid_lo;	/* lower part of owner's project id */
    802	__be16		di_projid_hi;	/* higher part owner's project id */
    803	union {
    804		/* Number of data fork extents if NREXT64 is set */
    805		__be64	di_big_nextents;
    806
    807		/* Padding for V3 inodes without NREXT64 set. */
    808		__be64	di_v3_pad;
    809
    810		/* Padding and inode flush counter for V2 inodes. */
    811		struct {
    812			__u8	di_v2_pad[6];
    813			__be16	di_flushiter;
    814		};
    815	};
    816	xfs_timestamp_t	di_atime;	/* time last accessed */
    817	xfs_timestamp_t	di_mtime;	/* time last modified */
    818	xfs_timestamp_t	di_ctime;	/* time created/inode modified */
    819	__be64		di_size;	/* number of bytes in file */
    820	__be64		di_nblocks;	/* # of direct & btree blocks used */
    821	__be32		di_extsize;	/* basic/minimum extent size for file */
    822	union {
    823		/*
    824		 * For V2 inodes and V3 inodes without NREXT64 set, this
    825		 * is the number of data and attr fork extents.
    826		 */
    827		struct {
    828			__be32	di_nextents;
    829			__be16	di_anextents;
    830		} __packed;
    831
    832		/* Number of attr fork extents if NREXT64 is set. */
    833		struct {
    834			__be32	di_big_anextents;
    835			__be16	di_nrext64_pad;
    836		} __packed;
    837	} __packed;
    838	__u8		di_forkoff;	/* attr fork offs, <<3 for 64b align */
    839	__s8		di_aformat;	/* format of attr fork's data */
    840	__be32		di_dmevmask;	/* DMIG event mask */
    841	__be16		di_dmstate;	/* DMIG state info */
    842	__be16		di_flags;	/* random flags, XFS_DIFLAG_... */
    843	__be32		di_gen;		/* generation number */
    844
    845	/* di_next_unlinked is the only non-core field in the old dinode */
    846	__be32		di_next_unlinked;/* agi unlinked list ptr */
    847
    848	/* start of the extended dinode, writable fields */
    849	__le32		di_crc;		/* CRC of the inode */
    850	__be64		di_changecount;	/* number of attribute changes */
    851	__be64		di_lsn;		/* flush sequence */
    852	__be64		di_flags2;	/* more random flags */
    853	__be32		di_cowextsize;	/* basic cow extent size for file */
    854	__u8		di_pad2[12];	/* more padding for future expansion */
    855
    856	/* fields only written to during inode creation */
    857	xfs_timestamp_t	di_crtime;	/* time created */
    858	__be64		di_ino;		/* inode number */
    859	uuid_t		di_uuid;	/* UUID of the filesystem */
    860
    861	/* structure must be padded to 64 bit alignment */
    862};
    863
    864#define XFS_DINODE_CRC_OFF	offsetof(struct xfs_dinode, di_crc)
    865
    866#define DI_MAX_FLUSH 0xffff
    867
    868/*
    869 * Size of the core inode on disk.  Version 1 and 2 inodes have
    870 * the same size, but version 3 has grown a few additional fields.
    871 */
    872static inline uint xfs_dinode_size(int version)
    873{
    874	if (version == 3)
    875		return sizeof(struct xfs_dinode);
    876	return offsetof(struct xfs_dinode, di_crc);
    877}
    878
    879/*
    880 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
    881 * Since the pathconf interface is signed, we use 2^31 - 1 instead.
    882 */
    883#define	XFS_MAXLINK		((1U << 31) - 1U)
    884
    885/*
    886 * Values for di_format
    887 *
    888 * This enum is used in string mapping in xfs_trace.h; please keep the
    889 * TRACE_DEFINE_ENUMs for it up to date.
    890 */
    891enum xfs_dinode_fmt {
    892	XFS_DINODE_FMT_DEV,		/* xfs_dev_t */
    893	XFS_DINODE_FMT_LOCAL,		/* bulk data */
    894	XFS_DINODE_FMT_EXTENTS,		/* struct xfs_bmbt_rec */
    895	XFS_DINODE_FMT_BTREE,		/* struct xfs_bmdr_block */
    896	XFS_DINODE_FMT_UUID		/* added long ago, but never used */
    897};
    898
    899#define XFS_INODE_FORMAT_STR \
    900	{ XFS_DINODE_FMT_DEV,		"dev" }, \
    901	{ XFS_DINODE_FMT_LOCAL,		"local" }, \
    902	{ XFS_DINODE_FMT_EXTENTS,	"extent" }, \
    903	{ XFS_DINODE_FMT_BTREE,		"btree" }, \
    904	{ XFS_DINODE_FMT_UUID,		"uuid" }
    905
    906/*
    907 * Max values for extnum and aextnum.
    908 *
    909 * The original on-disk extent counts were held in signed fields, resulting in
    910 * maximum extent counts of 2^31 and 2^15 for the data and attr forks
    911 * respectively. Similarly the maximum extent length is limited to 2^21 blocks
    912 * by the 21-bit wide blockcount field of a BMBT extent record.
    913 *
    914 * The newly introduced data fork extent counter can hold a 64-bit value,
    915 * however the maximum number of extents in a file is also limited to 2^54
    916 * extents by the 54-bit wide startoff field of a BMBT extent record.
    917 *
    918 * It is further limited by the maximum supported file size of 2^63
    919 * *bytes*. This leads to a maximum extent count for maximally sized filesystem
    920 * blocks (64kB) of:
    921 *
    922 * 2^63 bytes / 2^16 bytes per block = 2^47 blocks
    923 *
    924 * Rounding up 47 to the nearest multiple of bits-per-byte results in 48. Hence
    925 * 2^48 was chosen as the maximum data fork extent count.
    926 *
    927 * The maximum file size that can be represented by the data fork extent counter
    928 * in the worst case occurs when all extents are 1 block in length and each
    929 * block is 1KB in size.
    930 *
    931 * With XFS_MAX_EXTCNT_DATA_FORK_SMALL representing maximum extent count and
    932 * with 1KB sized blocks, a file can reach upto,
    933 * 1KB * (2^31) = 2TB
    934 *
    935 * This is much larger than the theoretical maximum size of a directory
    936 * i.e. XFS_DIR2_SPACE_SIZE * XFS_DIR2_MAX_SPACES = ~96GB.
    937 *
    938 * Hence, a directory inode can never overflow its data fork extent counter.
    939 */
    940#define XFS_MAX_EXTCNT_DATA_FORK_LARGE	((xfs_extnum_t)((1ULL << 48) - 1))
    941#define XFS_MAX_EXTCNT_ATTR_FORK_LARGE	((xfs_extnum_t)((1ULL << 32) - 1))
    942#define XFS_MAX_EXTCNT_DATA_FORK_SMALL	((xfs_extnum_t)((1ULL << 31) - 1))
    943#define XFS_MAX_EXTCNT_ATTR_FORK_SMALL	((xfs_extnum_t)((1ULL << 15) - 1))
    944
    945/*
    946 * When we upgrade an inode to the large extent counts, the maximum value by
    947 * which the extent count can increase is bound by the change in size of the
    948 * on-disk field. No upgrade operation should ever be adding more than a few
    949 * tens of extents, so if we get a really large value it is a sign of a code bug
    950 * or corruption.
    951 */
    952#define XFS_MAX_EXTCNT_UPGRADE_NR	\
    953	min(XFS_MAX_EXTCNT_ATTR_FORK_LARGE - XFS_MAX_EXTCNT_ATTR_FORK_SMALL,	\
    954	    XFS_MAX_EXTCNT_DATA_FORK_LARGE - XFS_MAX_EXTCNT_DATA_FORK_SMALL)
    955
    956/*
    957 * Inode minimum and maximum sizes.
    958 */
    959#define	XFS_DINODE_MIN_LOG	8
    960#define	XFS_DINODE_MAX_LOG	11
    961#define	XFS_DINODE_MIN_SIZE	(1 << XFS_DINODE_MIN_LOG)
    962#define	XFS_DINODE_MAX_SIZE	(1 << XFS_DINODE_MAX_LOG)
    963
    964/*
    965 * Inode size for given fs.
    966 */
    967#define XFS_DINODE_SIZE(mp) \
    968	(xfs_has_v3inodes(mp) ? \
    969		sizeof(struct xfs_dinode) : \
    970		offsetof(struct xfs_dinode, di_crc))
    971#define XFS_LITINO(mp) \
    972	((mp)->m_sb.sb_inodesize - XFS_DINODE_SIZE(mp))
    973
    974/*
    975 * Inode data & attribute fork sizes, per inode.
    976 */
    977#define XFS_DFORK_BOFF(dip)		((int)((dip)->di_forkoff << 3))
    978
    979#define XFS_DFORK_DSIZE(dip,mp) \
    980	((dip)->di_forkoff ? XFS_DFORK_BOFF(dip) : XFS_LITINO(mp))
    981#define XFS_DFORK_ASIZE(dip,mp) \
    982	((dip)->di_forkoff ? XFS_LITINO(mp) - XFS_DFORK_BOFF(dip) : 0)
    983#define XFS_DFORK_SIZE(dip,mp,w) \
    984	((w) == XFS_DATA_FORK ? \
    985		XFS_DFORK_DSIZE(dip, mp) : \
    986		XFS_DFORK_ASIZE(dip, mp))
    987
    988#define XFS_DFORK_MAXEXT(dip, mp, w) \
    989	(XFS_DFORK_SIZE(dip, mp, w) / sizeof(struct xfs_bmbt_rec))
    990
    991/*
    992 * Return pointers to the data or attribute forks.
    993 */
    994#define XFS_DFORK_DPTR(dip) \
    995	((char *)dip + xfs_dinode_size(dip->di_version))
    996#define XFS_DFORK_APTR(dip)	\
    997	(XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
    998#define XFS_DFORK_PTR(dip,w)	\
    999	((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
   1000
   1001#define XFS_DFORK_FORMAT(dip,w) \
   1002	((w) == XFS_DATA_FORK ? \
   1003		(dip)->di_format : \
   1004		(dip)->di_aformat)
   1005
   1006/*
   1007 * For block and character special files the 32bit dev_t is stored at the
   1008 * beginning of the data fork.
   1009 */
   1010static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
   1011{
   1012	return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
   1013}
   1014
   1015static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
   1016{
   1017	*(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
   1018}
   1019
   1020/*
   1021 * Values for di_flags
   1022 */
   1023#define XFS_DIFLAG_REALTIME_BIT  0	/* file's blocks come from rt area */
   1024#define XFS_DIFLAG_PREALLOC_BIT  1	/* file space has been preallocated */
   1025#define XFS_DIFLAG_NEWRTBM_BIT   2	/* for rtbitmap inode, new format */
   1026#define XFS_DIFLAG_IMMUTABLE_BIT 3	/* inode is immutable */
   1027#define XFS_DIFLAG_APPEND_BIT    4	/* inode is append-only */
   1028#define XFS_DIFLAG_SYNC_BIT      5	/* inode is written synchronously */
   1029#define XFS_DIFLAG_NOATIME_BIT   6	/* do not update atime */
   1030#define XFS_DIFLAG_NODUMP_BIT    7	/* do not dump */
   1031#define XFS_DIFLAG_RTINHERIT_BIT 8	/* create with realtime bit set */
   1032#define XFS_DIFLAG_PROJINHERIT_BIT   9	/* create with parents projid */
   1033#define XFS_DIFLAG_NOSYMLINKS_BIT   10	/* disallow symlink creation */
   1034#define XFS_DIFLAG_EXTSIZE_BIT      11	/* inode extent size allocator hint */
   1035#define XFS_DIFLAG_EXTSZINHERIT_BIT 12	/* inherit inode extent size */
   1036#define XFS_DIFLAG_NODEFRAG_BIT     13	/* do not reorganize/defragment */
   1037#define XFS_DIFLAG_FILESTREAM_BIT   14  /* use filestream allocator */
   1038/* Do not use bit 15, di_flags is legacy and unchanging now */
   1039
   1040#define XFS_DIFLAG_REALTIME      (1 << XFS_DIFLAG_REALTIME_BIT)
   1041#define XFS_DIFLAG_PREALLOC      (1 << XFS_DIFLAG_PREALLOC_BIT)
   1042#define XFS_DIFLAG_NEWRTBM       (1 << XFS_DIFLAG_NEWRTBM_BIT)
   1043#define XFS_DIFLAG_IMMUTABLE     (1 << XFS_DIFLAG_IMMUTABLE_BIT)
   1044#define XFS_DIFLAG_APPEND        (1 << XFS_DIFLAG_APPEND_BIT)
   1045#define XFS_DIFLAG_SYNC          (1 << XFS_DIFLAG_SYNC_BIT)
   1046#define XFS_DIFLAG_NOATIME       (1 << XFS_DIFLAG_NOATIME_BIT)
   1047#define XFS_DIFLAG_NODUMP        (1 << XFS_DIFLAG_NODUMP_BIT)
   1048#define XFS_DIFLAG_RTINHERIT     (1 << XFS_DIFLAG_RTINHERIT_BIT)
   1049#define XFS_DIFLAG_PROJINHERIT   (1 << XFS_DIFLAG_PROJINHERIT_BIT)
   1050#define XFS_DIFLAG_NOSYMLINKS    (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
   1051#define XFS_DIFLAG_EXTSIZE       (1 << XFS_DIFLAG_EXTSIZE_BIT)
   1052#define XFS_DIFLAG_EXTSZINHERIT  (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
   1053#define XFS_DIFLAG_NODEFRAG      (1 << XFS_DIFLAG_NODEFRAG_BIT)
   1054#define XFS_DIFLAG_FILESTREAM    (1 << XFS_DIFLAG_FILESTREAM_BIT)
   1055
   1056#define XFS_DIFLAG_ANY \
   1057	(XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
   1058	 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
   1059	 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
   1060	 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
   1061	 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
   1062
   1063/*
   1064 * Values for di_flags2 These start by being exposed to userspace in the upper
   1065 * 16 bits of the XFS_XFLAG_s range.
   1066 */
   1067#define XFS_DIFLAG2_DAX_BIT	0	/* use DAX for this inode */
   1068#define XFS_DIFLAG2_REFLINK_BIT	1	/* file's blocks may be shared */
   1069#define XFS_DIFLAG2_COWEXTSIZE_BIT   2  /* copy on write extent size hint */
   1070#define XFS_DIFLAG2_BIGTIME_BIT	3	/* big timestamps */
   1071#define XFS_DIFLAG2_NREXT64_BIT 4	/* large extent counters */
   1072
   1073#define XFS_DIFLAG2_DAX		(1 << XFS_DIFLAG2_DAX_BIT)
   1074#define XFS_DIFLAG2_REFLINK     (1 << XFS_DIFLAG2_REFLINK_BIT)
   1075#define XFS_DIFLAG2_COWEXTSIZE  (1 << XFS_DIFLAG2_COWEXTSIZE_BIT)
   1076#define XFS_DIFLAG2_BIGTIME	(1 << XFS_DIFLAG2_BIGTIME_BIT)
   1077#define XFS_DIFLAG2_NREXT64	(1 << XFS_DIFLAG2_NREXT64_BIT)
   1078
   1079#define XFS_DIFLAG2_ANY \
   1080	(XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE | \
   1081	 XFS_DIFLAG2_BIGTIME | XFS_DIFLAG2_NREXT64)
   1082
   1083static inline bool xfs_dinode_has_bigtime(const struct xfs_dinode *dip)
   1084{
   1085	return dip->di_version >= 3 &&
   1086	       (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_BIGTIME));
   1087}
   1088
   1089static inline bool xfs_dinode_has_large_extent_counts(
   1090	const struct xfs_dinode *dip)
   1091{
   1092	return dip->di_version >= 3 &&
   1093	       (dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_NREXT64));
   1094}
   1095
   1096/*
   1097 * Inode number format:
   1098 * low inopblog bits - offset in block
   1099 * next agblklog bits - block number in ag
   1100 * next agno_log bits - ag number
   1101 * high agno_log-agblklog-inopblog bits - 0
   1102 */
   1103#define	XFS_INO_MASK(k)			(uint32_t)((1ULL << (k)) - 1)
   1104#define	XFS_INO_OFFSET_BITS(mp)		(mp)->m_sb.sb_inopblog
   1105#define	XFS_INO_AGBNO_BITS(mp)		(mp)->m_sb.sb_agblklog
   1106#define	XFS_INO_AGINO_BITS(mp)		((mp)->m_ino_geo.agino_log)
   1107#define	XFS_INO_AGNO_BITS(mp)		(mp)->m_agno_log
   1108#define	XFS_INO_BITS(mp)		\
   1109	XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
   1110#define	XFS_INO_TO_AGNO(mp,i)		\
   1111	((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
   1112#define	XFS_INO_TO_AGINO(mp,i)		\
   1113	((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
   1114#define	XFS_INO_TO_AGBNO(mp,i)		\
   1115	(((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
   1116		XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
   1117#define	XFS_INO_TO_OFFSET(mp,i)		\
   1118	((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
   1119#define	XFS_INO_TO_FSB(mp,i)		\
   1120	XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
   1121#define	XFS_AGINO_TO_INO(mp,a,i)	\
   1122	(((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
   1123#define	XFS_AGINO_TO_AGBNO(mp,i)	((i) >> XFS_INO_OFFSET_BITS(mp))
   1124#define	XFS_AGINO_TO_OFFSET(mp,i)	\
   1125	((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
   1126#define	XFS_OFFBNO_TO_AGINO(mp,b,o)	\
   1127	((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
   1128#define	XFS_FSB_TO_INO(mp, b)	((xfs_ino_t)((b) << XFS_INO_OFFSET_BITS(mp)))
   1129#define	XFS_AGB_TO_AGINO(mp, b)	((xfs_agino_t)((b) << XFS_INO_OFFSET_BITS(mp)))
   1130
   1131#define	XFS_MAXINUMBER		((xfs_ino_t)((1ULL << 56) - 1ULL))
   1132#define	XFS_MAXINUMBER_32	((xfs_ino_t)((1ULL << 32) - 1ULL))
   1133
   1134/*
   1135 * RealTime Device format definitions
   1136 */
   1137
   1138/* Min and max rt extent sizes, specified in bytes */
   1139#define	XFS_MAX_RTEXTSIZE	(1024 * 1024 * 1024)	/* 1GB */
   1140#define	XFS_DFL_RTEXTSIZE	(64 * 1024)	        /* 64kB */
   1141#define	XFS_MIN_RTEXTSIZE	(4 * 1024)		/* 4kB */
   1142
   1143#define	XFS_BLOCKSIZE(mp)	((mp)->m_sb.sb_blocksize)
   1144#define	XFS_BLOCKMASK(mp)	((mp)->m_blockmask)
   1145#define	XFS_BLOCKWSIZE(mp)	((mp)->m_blockwsize)
   1146#define	XFS_BLOCKWMASK(mp)	((mp)->m_blockwmask)
   1147
   1148/*
   1149 * RT Summary and bit manipulation macros.
   1150 */
   1151#define	XFS_SUMOFFS(mp,ls,bb)	((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
   1152#define	XFS_SUMOFFSTOBLOCK(mp,s)	\
   1153	(((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
   1154#define	XFS_SUMPTR(mp,bp,so)	\
   1155	((xfs_suminfo_t *)((bp)->b_addr + \
   1156		(((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
   1157
   1158#define	XFS_BITTOBLOCK(mp,bi)	((bi) >> (mp)->m_blkbit_log)
   1159#define	XFS_BLOCKTOBIT(mp,bb)	((bb) << (mp)->m_blkbit_log)
   1160#define	XFS_BITTOWORD(mp,bi)	\
   1161	((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
   1162
   1163#define	XFS_RTMIN(a,b)	((a) < (b) ? (a) : (b))
   1164#define	XFS_RTMAX(a,b)	((a) > (b) ? (a) : (b))
   1165
   1166#define	XFS_RTLOBIT(w)	xfs_lowbit32(w)
   1167#define	XFS_RTHIBIT(w)	xfs_highbit32(w)
   1168
   1169#define	XFS_RTBLOCKLOG(b)	xfs_highbit64(b)
   1170
   1171/*
   1172 * Dquot and dquot block format definitions
   1173 */
   1174#define XFS_DQUOT_MAGIC		0x4451		/* 'DQ' */
   1175#define XFS_DQUOT_VERSION	(uint8_t)0x01	/* latest version number */
   1176
   1177#define XFS_DQTYPE_USER		(1u << 0)	/* user dquot record */
   1178#define XFS_DQTYPE_PROJ		(1u << 1)	/* project dquot record */
   1179#define XFS_DQTYPE_GROUP	(1u << 2)	/* group dquot record */
   1180#define XFS_DQTYPE_BIGTIME	(1u << 7)	/* large expiry timestamps */
   1181
   1182/* bitmask to determine if this is a user/group/project dquot */
   1183#define XFS_DQTYPE_REC_MASK	(XFS_DQTYPE_USER | \
   1184				 XFS_DQTYPE_PROJ | \
   1185				 XFS_DQTYPE_GROUP)
   1186
   1187#define XFS_DQTYPE_ANY		(XFS_DQTYPE_REC_MASK | \
   1188				 XFS_DQTYPE_BIGTIME)
   1189
   1190/*
   1191 * XFS Quota Timers
   1192 * ================
   1193 *
   1194 * Traditional quota grace period expiration timers are an unsigned 32-bit
   1195 * seconds counter; time zero is the Unix epoch, Jan  1 00:00:01 UTC 1970.
   1196 * Note that an expiration value of zero means that the quota limit has not
   1197 * been reached, and therefore no expiration has been set.  Therefore, the
   1198 * ondisk min and max defined here can be used directly to constrain the incore
   1199 * quota expiration timestamps on a Unix system.
   1200 *
   1201 * When bigtime is enabled, we trade two bits of precision to expand the
   1202 * expiration timeout range to match that of big inode timestamps.  The min and
   1203 * max recorded here are the on-disk limits, not a Unix timestamp.
   1204 *
   1205 * The grace period for each quota type is stored in the root dquot (id = 0)
   1206 * and is applied to a non-root dquot when it exceeds the soft or hard limits.
   1207 * The length of quota grace periods are unsigned 32-bit quantities measured in
   1208 * units of seconds.  A value of zero means to use the default period.
   1209 */
   1210
   1211/*
   1212 * Smallest possible ondisk quota expiration value with traditional timestamps.
   1213 * This corresponds exactly with the incore expiration Jan  1 00:00:01 UTC 1970.
   1214 */
   1215#define XFS_DQ_LEGACY_EXPIRY_MIN	((int64_t)1)
   1216
   1217/*
   1218 * Largest possible ondisk quota expiration value with traditional timestamps.
   1219 * This corresponds exactly with the incore expiration Feb  7 06:28:15 UTC 2106.
   1220 */
   1221#define XFS_DQ_LEGACY_EXPIRY_MAX	((int64_t)U32_MAX)
   1222
   1223/*
   1224 * Smallest possible ondisk quota expiration value with bigtime timestamps.
   1225 * This corresponds (after conversion to a Unix timestamp) with the incore
   1226 * expiration of Jan  1 00:00:04 UTC 1970.
   1227 */
   1228#define XFS_DQ_BIGTIME_EXPIRY_MIN	(XFS_DQ_LEGACY_EXPIRY_MIN)
   1229
   1230/*
   1231 * Largest supported ondisk quota expiration value with bigtime timestamps.
   1232 * This corresponds (after conversion to a Unix timestamp) with an incore
   1233 * expiration of Jul  2 20:20:24 UTC 2486.
   1234 *
   1235 * The ondisk field supports values up to -1U, which corresponds to an incore
   1236 * expiration in 2514.  This is beyond the maximum the bigtime inode timestamp,
   1237 * so we cap the maximum bigtime quota expiration to the max inode timestamp.
   1238 */
   1239#define XFS_DQ_BIGTIME_EXPIRY_MAX	((int64_t)4074815106U)
   1240
   1241/*
   1242 * The following conversion factors assist in converting a quota expiration
   1243 * timestamp between the incore and ondisk formats.
   1244 */
   1245#define XFS_DQ_BIGTIME_SHIFT	(2)
   1246#define XFS_DQ_BIGTIME_SLACK	((int64_t)(1ULL << XFS_DQ_BIGTIME_SHIFT) - 1)
   1247
   1248/* Convert an incore quota expiration timestamp to an ondisk bigtime value. */
   1249static inline uint32_t xfs_dq_unix_to_bigtime(time64_t unix_seconds)
   1250{
   1251	/*
   1252	 * Round the expiration timestamp up to the nearest bigtime timestamp
   1253	 * that we can store, to give users the most time to fix problems.
   1254	 */
   1255	return ((uint64_t)unix_seconds + XFS_DQ_BIGTIME_SLACK) >>
   1256			XFS_DQ_BIGTIME_SHIFT;
   1257}
   1258
   1259/* Convert an ondisk bigtime quota expiration value to an incore timestamp. */
   1260static inline time64_t xfs_dq_bigtime_to_unix(uint32_t ondisk_seconds)
   1261{
   1262	return (time64_t)ondisk_seconds << XFS_DQ_BIGTIME_SHIFT;
   1263}
   1264
   1265/*
   1266 * Default quota grace periods, ranging from zero (use the compiled defaults)
   1267 * to ~136 years.  These are applied to a non-root dquot that has exceeded
   1268 * either limit.
   1269 */
   1270#define XFS_DQ_GRACE_MIN		((int64_t)0)
   1271#define XFS_DQ_GRACE_MAX		((int64_t)U32_MAX)
   1272
   1273/*
   1274 * This is the main portion of the on-disk representation of quota information
   1275 * for a user.  We pad this with some more expansion room to construct the on
   1276 * disk structure.
   1277 */
   1278struct xfs_disk_dquot {
   1279	__be16		d_magic;	/* dquot magic = XFS_DQUOT_MAGIC */
   1280	__u8		d_version;	/* dquot version */
   1281	__u8		d_type;		/* XFS_DQTYPE_USER/PROJ/GROUP */
   1282	__be32		d_id;		/* user,project,group id */
   1283	__be64		d_blk_hardlimit;/* absolute limit on disk blks */
   1284	__be64		d_blk_softlimit;/* preferred limit on disk blks */
   1285	__be64		d_ino_hardlimit;/* maximum # allocated inodes */
   1286	__be64		d_ino_softlimit;/* preferred inode limit */
   1287	__be64		d_bcount;	/* disk blocks owned by the user */
   1288	__be64		d_icount;	/* inodes owned by the user */
   1289	__be32		d_itimer;	/* zero if within inode limits if not,
   1290					   this is when we refuse service */
   1291	__be32		d_btimer;	/* similar to above; for disk blocks */
   1292	__be16		d_iwarns;	/* warnings issued wrt num inodes */
   1293	__be16		d_bwarns;	/* warnings issued wrt disk blocks */
   1294	__be32		d_pad0;		/* 64 bit align */
   1295	__be64		d_rtb_hardlimit;/* absolute limit on realtime blks */
   1296	__be64		d_rtb_softlimit;/* preferred limit on RT disk blks */
   1297	__be64		d_rtbcount;	/* realtime blocks owned */
   1298	__be32		d_rtbtimer;	/* similar to above; for RT disk blocks */
   1299	__be16		d_rtbwarns;	/* warnings issued wrt RT disk blocks */
   1300	__be16		d_pad;
   1301};
   1302
   1303/*
   1304 * This is what goes on disk. This is separated from the xfs_disk_dquot because
   1305 * carrying the unnecessary padding would be a waste of memory.
   1306 */
   1307struct xfs_dqblk {
   1308	struct xfs_disk_dquot	dd_diskdq; /* portion living incore as well */
   1309	char			dd_fill[4];/* filling for posterity */
   1310
   1311	/*
   1312	 * These two are only present on filesystems with the CRC bits set.
   1313	 */
   1314	__be32		  dd_crc;	/* checksum */
   1315	__be64		  dd_lsn;	/* last modification in log */
   1316	uuid_t		  dd_uuid;	/* location information */
   1317};
   1318
   1319#define XFS_DQUOT_CRC_OFF	offsetof(struct xfs_dqblk, dd_crc)
   1320
   1321/*
   1322 * This defines the unit of allocation of dquots.
   1323 *
   1324 * Currently, it is just one file system block, and a 4K blk contains 30
   1325 * (136 * 30 = 4080) dquots. It's probably not worth trying to make
   1326 * this more dynamic.
   1327 *
   1328 * However, if this number is changed, we have to make sure that we don't
   1329 * implicitly assume that we do allocations in chunks of a single filesystem
   1330 * block in the dquot/xqm code.
   1331 *
   1332 * This is part of the ondisk format because the structure size is not a power
   1333 * of two, which leaves slack at the end of the disk block.
   1334 */
   1335#define XFS_DQUOT_CLUSTER_SIZE_FSB	(xfs_filblks_t)1
   1336
   1337/*
   1338 * Remote symlink format and access functions.
   1339 */
   1340#define XFS_SYMLINK_MAGIC	0x58534c4d	/* XSLM */
   1341
   1342struct xfs_dsymlink_hdr {
   1343	__be32	sl_magic;
   1344	__be32	sl_offset;
   1345	__be32	sl_bytes;
   1346	__be32	sl_crc;
   1347	uuid_t	sl_uuid;
   1348	__be64	sl_owner;
   1349	__be64	sl_blkno;
   1350	__be64	sl_lsn;
   1351};
   1352
   1353#define XFS_SYMLINK_CRC_OFF	offsetof(struct xfs_dsymlink_hdr, sl_crc)
   1354
   1355#define XFS_SYMLINK_MAXLEN	1024
   1356/*
   1357 * The maximum pathlen is 1024 bytes. Since the minimum file system
   1358 * blocksize is 512 bytes, we can get a max of 3 extents back from
   1359 * bmapi when crc headers are taken into account.
   1360 */
   1361#define XFS_SYMLINK_MAPS 3
   1362
   1363#define XFS_SYMLINK_BUF_SPACE(mp, bufsize)	\
   1364	((bufsize) - (xfs_has_crc((mp)) ? \
   1365			sizeof(struct xfs_dsymlink_hdr) : 0))
   1366
   1367
   1368/*
   1369 * Allocation Btree format definitions
   1370 *
   1371 * There are two on-disk btrees, one sorted by blockno and one sorted
   1372 * by blockcount and blockno.  All blocks look the same to make the code
   1373 * simpler; if we have time later, we'll make the optimizations.
   1374 */
   1375#define	XFS_ABTB_MAGIC		0x41425442	/* 'ABTB' for bno tree */
   1376#define	XFS_ABTB_CRC_MAGIC	0x41423342	/* 'AB3B' */
   1377#define	XFS_ABTC_MAGIC		0x41425443	/* 'ABTC' for cnt tree */
   1378#define	XFS_ABTC_CRC_MAGIC	0x41423343	/* 'AB3C' */
   1379
   1380/*
   1381 * Data record/key structure
   1382 */
   1383typedef struct xfs_alloc_rec {
   1384	__be32		ar_startblock;	/* starting block number */
   1385	__be32		ar_blockcount;	/* count of free blocks */
   1386} xfs_alloc_rec_t, xfs_alloc_key_t;
   1387
   1388typedef struct xfs_alloc_rec_incore {
   1389	xfs_agblock_t	ar_startblock;	/* starting block number */
   1390	xfs_extlen_t	ar_blockcount;	/* count of free blocks */
   1391} xfs_alloc_rec_incore_t;
   1392
   1393/* btree pointer type */
   1394typedef __be32 xfs_alloc_ptr_t;
   1395
   1396/*
   1397 * Block numbers in the AG:
   1398 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
   1399 */
   1400#define	XFS_BNO_BLOCK(mp)	((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
   1401#define	XFS_CNT_BLOCK(mp)	((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
   1402
   1403
   1404/*
   1405 * Inode Allocation Btree format definitions
   1406 *
   1407 * There is a btree for the inode map per allocation group.
   1408 */
   1409#define	XFS_IBT_MAGIC		0x49414254	/* 'IABT' */
   1410#define	XFS_IBT_CRC_MAGIC	0x49414233	/* 'IAB3' */
   1411#define	XFS_FIBT_MAGIC		0x46494254	/* 'FIBT' */
   1412#define	XFS_FIBT_CRC_MAGIC	0x46494233	/* 'FIB3' */
   1413
   1414typedef uint64_t	xfs_inofree_t;
   1415#define	XFS_INODES_PER_CHUNK		(NBBY * sizeof(xfs_inofree_t))
   1416#define	XFS_INODES_PER_CHUNK_LOG	(XFS_NBBYLOG + 3)
   1417#define	XFS_INOBT_ALL_FREE		((xfs_inofree_t)-1)
   1418#define	XFS_INOBT_MASK(i)		((xfs_inofree_t)1 << (i))
   1419
   1420#define XFS_INOBT_HOLEMASK_FULL		0	/* holemask for full chunk */
   1421#define XFS_INOBT_HOLEMASK_BITS		(NBBY * sizeof(uint16_t))
   1422#define XFS_INODES_PER_HOLEMASK_BIT	\
   1423	(XFS_INODES_PER_CHUNK / (NBBY * sizeof(uint16_t)))
   1424
   1425static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
   1426{
   1427	return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
   1428}
   1429
   1430/*
   1431 * The on-disk inode record structure has two formats. The original "full"
   1432 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount
   1433 * and replaces the 3 high-order freecount bytes wth the holemask and inode
   1434 * count.
   1435 *
   1436 * The holemask of the sparse record format allows an inode chunk to have holes
   1437 * that refer to blocks not owned by the inode record. This facilitates inode
   1438 * allocation in the event of severe free space fragmentation.
   1439 */
   1440typedef struct xfs_inobt_rec {
   1441	__be32		ir_startino;	/* starting inode number */
   1442	union {
   1443		struct {
   1444			__be32	ir_freecount;	/* count of free inodes */
   1445		} f;
   1446		struct {
   1447			__be16	ir_holemask;/* hole mask for sparse chunks */
   1448			__u8	ir_count;	/* total inode count */
   1449			__u8	ir_freecount;	/* count of free inodes */
   1450		} sp;
   1451	} ir_u;
   1452	__be64		ir_free;	/* free inode mask */
   1453} xfs_inobt_rec_t;
   1454
   1455typedef struct xfs_inobt_rec_incore {
   1456	xfs_agino_t	ir_startino;	/* starting inode number */
   1457	uint16_t	ir_holemask;	/* hole mask for sparse chunks */
   1458	uint8_t		ir_count;	/* total inode count */
   1459	uint8_t		ir_freecount;	/* count of free inodes (set bits) */
   1460	xfs_inofree_t	ir_free;	/* free inode mask */
   1461} xfs_inobt_rec_incore_t;
   1462
   1463static inline bool xfs_inobt_issparse(uint16_t holemask)
   1464{
   1465	/* non-zero holemask represents a sparse rec. */
   1466	return holemask;
   1467}
   1468
   1469/*
   1470 * Key structure
   1471 */
   1472typedef struct xfs_inobt_key {
   1473	__be32		ir_startino;	/* starting inode number */
   1474} xfs_inobt_key_t;
   1475
   1476/* btree pointer type */
   1477typedef __be32 xfs_inobt_ptr_t;
   1478
   1479/*
   1480 * block numbers in the AG.
   1481 */
   1482#define	XFS_IBT_BLOCK(mp)		((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
   1483#define	XFS_FIBT_BLOCK(mp)		((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
   1484
   1485/*
   1486 * Reverse mapping btree format definitions
   1487 *
   1488 * There is a btree for the reverse map per allocation group
   1489 */
   1490#define	XFS_RMAP_CRC_MAGIC	0x524d4233	/* 'RMB3' */
   1491
   1492/*
   1493 * Ownership info for an extent.  This is used to create reverse-mapping
   1494 * entries.
   1495 */
   1496#define XFS_OWNER_INFO_ATTR_FORK	(1 << 0)
   1497#define XFS_OWNER_INFO_BMBT_BLOCK	(1 << 1)
   1498struct xfs_owner_info {
   1499	uint64_t		oi_owner;
   1500	xfs_fileoff_t		oi_offset;
   1501	unsigned int		oi_flags;
   1502};
   1503
   1504/*
   1505 * Special owner types.
   1506 *
   1507 * Seeing as we only support up to 8EB, we have the upper bit of the owner field
   1508 * to tell us we have a special owner value. We use these for static metadata
   1509 * allocated at mkfs/growfs time, as well as for freespace management metadata.
   1510 */
   1511#define XFS_RMAP_OWN_NULL	(-1ULL)	/* No owner, for growfs */
   1512#define XFS_RMAP_OWN_UNKNOWN	(-2ULL)	/* Unknown owner, for EFI recovery */
   1513#define XFS_RMAP_OWN_FS		(-3ULL)	/* static fs metadata */
   1514#define XFS_RMAP_OWN_LOG	(-4ULL)	/* static fs metadata */
   1515#define XFS_RMAP_OWN_AG		(-5ULL)	/* AG freespace btree blocks */
   1516#define XFS_RMAP_OWN_INOBT	(-6ULL)	/* Inode btree blocks */
   1517#define XFS_RMAP_OWN_INODES	(-7ULL)	/* Inode chunk */
   1518#define XFS_RMAP_OWN_REFC	(-8ULL) /* refcount tree */
   1519#define XFS_RMAP_OWN_COW	(-9ULL) /* cow allocations */
   1520#define XFS_RMAP_OWN_MIN	(-10ULL) /* guard */
   1521
   1522#define XFS_RMAP_NON_INODE_OWNER(owner)	(!!((owner) & (1ULL << 63)))
   1523
   1524/*
   1525 * Data record structure
   1526 */
   1527struct xfs_rmap_rec {
   1528	__be32		rm_startblock;	/* extent start block */
   1529	__be32		rm_blockcount;	/* extent length */
   1530	__be64		rm_owner;	/* extent owner */
   1531	__be64		rm_offset;	/* offset within the owner */
   1532};
   1533
   1534/*
   1535 * rmap btree record
   1536 *  rm_offset:63 is the attribute fork flag
   1537 *  rm_offset:62 is the bmbt block flag
   1538 *  rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt)
   1539 *  rm_offset:54-60 aren't used and should be zero
   1540 *  rm_offset:0-53 is the block offset within the inode
   1541 */
   1542#define XFS_RMAP_OFF_ATTR_FORK	((uint64_t)1ULL << 63)
   1543#define XFS_RMAP_OFF_BMBT_BLOCK	((uint64_t)1ULL << 62)
   1544#define XFS_RMAP_OFF_UNWRITTEN	((uint64_t)1ULL << 61)
   1545
   1546#define XFS_RMAP_LEN_MAX	((uint32_t)~0U)
   1547#define XFS_RMAP_OFF_FLAGS	(XFS_RMAP_OFF_ATTR_FORK | \
   1548				 XFS_RMAP_OFF_BMBT_BLOCK | \
   1549				 XFS_RMAP_OFF_UNWRITTEN)
   1550#define XFS_RMAP_OFF_MASK	((uint64_t)0x3FFFFFFFFFFFFFULL)
   1551
   1552#define XFS_RMAP_OFF(off)		((off) & XFS_RMAP_OFF_MASK)
   1553
   1554#define XFS_RMAP_IS_BMBT_BLOCK(off)	(!!((off) & XFS_RMAP_OFF_BMBT_BLOCK))
   1555#define XFS_RMAP_IS_ATTR_FORK(off)	(!!((off) & XFS_RMAP_OFF_ATTR_FORK))
   1556#define XFS_RMAP_IS_UNWRITTEN(len)	(!!((off) & XFS_RMAP_OFF_UNWRITTEN))
   1557
   1558#define RMAPBT_STARTBLOCK_BITLEN	32
   1559#define RMAPBT_BLOCKCOUNT_BITLEN	32
   1560#define RMAPBT_OWNER_BITLEN		64
   1561#define RMAPBT_ATTRFLAG_BITLEN		1
   1562#define RMAPBT_BMBTFLAG_BITLEN		1
   1563#define RMAPBT_EXNTFLAG_BITLEN		1
   1564#define RMAPBT_UNUSED_OFFSET_BITLEN	7
   1565#define RMAPBT_OFFSET_BITLEN		54
   1566
   1567#define XFS_RMAP_ATTR_FORK		(1 << 0)
   1568#define XFS_RMAP_BMBT_BLOCK		(1 << 1)
   1569#define XFS_RMAP_UNWRITTEN		(1 << 2)
   1570#define XFS_RMAP_KEY_FLAGS		(XFS_RMAP_ATTR_FORK | \
   1571					 XFS_RMAP_BMBT_BLOCK)
   1572#define XFS_RMAP_REC_FLAGS		(XFS_RMAP_UNWRITTEN)
   1573struct xfs_rmap_irec {
   1574	xfs_agblock_t	rm_startblock;	/* extent start block */
   1575	xfs_extlen_t	rm_blockcount;	/* extent length */
   1576	uint64_t	rm_owner;	/* extent owner */
   1577	uint64_t	rm_offset;	/* offset within the owner */
   1578	unsigned int	rm_flags;	/* state flags */
   1579};
   1580
   1581/*
   1582 * Key structure
   1583 *
   1584 * We don't use the length for lookups
   1585 */
   1586struct xfs_rmap_key {
   1587	__be32		rm_startblock;	/* extent start block */
   1588	__be64		rm_owner;	/* extent owner */
   1589	__be64		rm_offset;	/* offset within the owner */
   1590} __attribute__((packed));
   1591
   1592/* btree pointer type */
   1593typedef __be32 xfs_rmap_ptr_t;
   1594
   1595#define	XFS_RMAP_BLOCK(mp) \
   1596	(xfs_has_finobt(((mp))) ? \
   1597	 XFS_FIBT_BLOCK(mp) + 1 : \
   1598	 XFS_IBT_BLOCK(mp) + 1)
   1599
   1600/*
   1601 * Reference Count Btree format definitions
   1602 *
   1603 */
   1604#define	XFS_REFC_CRC_MAGIC	0x52334643	/* 'R3FC' */
   1605
   1606unsigned int xfs_refc_block(struct xfs_mount *mp);
   1607
   1608/*
   1609 * Data record/key structure
   1610 *
   1611 * Each record associates a range of physical blocks (starting at
   1612 * rc_startblock and ending rc_blockcount blocks later) with a reference
   1613 * count (rc_refcount).  Extents that are being used to stage a copy on
   1614 * write (CoW) operation are recorded in the refcount btree with a
   1615 * refcount of 1.  All other records must have a refcount > 1 and must
   1616 * track an extent mapped only by file data forks.
   1617 *
   1618 * Extents with a single owner (attributes, metadata, non-shared file
   1619 * data) are not tracked here.  Free space is also not tracked here.
   1620 * This is consistent with pre-reflink XFS.
   1621 */
   1622
   1623/*
   1624 * Extents that are being used to stage a copy on write are stored
   1625 * in the refcount btree with a refcount of 1 and the upper bit set
   1626 * on the startblock.  This speeds up mount time deletion of stale
   1627 * staging extents because they're all at the right side of the tree.
   1628 */
   1629#define XFS_REFC_COW_START		((xfs_agblock_t)(1U << 31))
   1630#define REFCNTBT_COWFLAG_BITLEN		1
   1631#define REFCNTBT_AGBLOCK_BITLEN		31
   1632
   1633struct xfs_refcount_rec {
   1634	__be32		rc_startblock;	/* starting block number */
   1635	__be32		rc_blockcount;	/* count of blocks */
   1636	__be32		rc_refcount;	/* number of inodes linked here */
   1637};
   1638
   1639struct xfs_refcount_key {
   1640	__be32		rc_startblock;	/* starting block number */
   1641};
   1642
   1643struct xfs_refcount_irec {
   1644	xfs_agblock_t	rc_startblock;	/* starting block number */
   1645	xfs_extlen_t	rc_blockcount;	/* count of free blocks */
   1646	xfs_nlink_t	rc_refcount;	/* number of inodes linked here */
   1647};
   1648
   1649#define MAXREFCOUNT	((xfs_nlink_t)~0U)
   1650#define MAXREFCEXTLEN	((xfs_extlen_t)~0U)
   1651
   1652/* btree pointer type */
   1653typedef __be32 xfs_refcount_ptr_t;
   1654
   1655
   1656/*
   1657 * BMAP Btree format definitions
   1658 *
   1659 * This includes both the root block definition that sits inside an inode fork
   1660 * and the record/pointer formats for the leaf/node in the blocks.
   1661 */
   1662#define XFS_BMAP_MAGIC		0x424d4150	/* 'BMAP' */
   1663#define XFS_BMAP_CRC_MAGIC	0x424d4133	/* 'BMA3' */
   1664
   1665/*
   1666 * Bmap root header, on-disk form only.
   1667 */
   1668typedef struct xfs_bmdr_block {
   1669	__be16		bb_level;	/* 0 is a leaf */
   1670	__be16		bb_numrecs;	/* current # of data records */
   1671} xfs_bmdr_block_t;
   1672
   1673/*
   1674 * Bmap btree record and extent descriptor.
   1675 *  l0:63 is an extent flag (value 1 indicates non-normal).
   1676 *  l0:9-62 are startoff.
   1677 *  l0:0-8 and l1:21-63 are startblock.
   1678 *  l1:0-20 are blockcount.
   1679 */
   1680#define BMBT_EXNTFLAG_BITLEN	1
   1681#define BMBT_STARTOFF_BITLEN	54
   1682#define BMBT_STARTBLOCK_BITLEN	52
   1683#define BMBT_BLOCKCOUNT_BITLEN	21
   1684
   1685#define BMBT_STARTOFF_MASK	((1ULL << BMBT_STARTOFF_BITLEN) - 1)
   1686#define BMBT_BLOCKCOUNT_MASK	((1ULL << BMBT_BLOCKCOUNT_BITLEN) - 1)
   1687
   1688#define XFS_MAX_BMBT_EXTLEN	((xfs_extlen_t)(BMBT_BLOCKCOUNT_MASK))
   1689
   1690/*
   1691 * bmbt records have a file offset (block) field that is 54 bits wide, so this
   1692 * is the largest xfs_fileoff_t that we ever expect to see.
   1693 */
   1694#define XFS_MAX_FILEOFF		(BMBT_STARTOFF_MASK + BMBT_BLOCKCOUNT_MASK)
   1695
   1696typedef struct xfs_bmbt_rec {
   1697	__be64			l0, l1;
   1698} xfs_bmbt_rec_t;
   1699
   1700typedef uint64_t	xfs_bmbt_rec_base_t;	/* use this for casts */
   1701typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
   1702
   1703/*
   1704 * Values and macros for delayed-allocation startblock fields.
   1705 */
   1706#define STARTBLOCKVALBITS	17
   1707#define STARTBLOCKMASKBITS	(15 + 20)
   1708#define STARTBLOCKMASK		\
   1709	(((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
   1710
   1711static inline int isnullstartblock(xfs_fsblock_t x)
   1712{
   1713	return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
   1714}
   1715
   1716static inline xfs_fsblock_t nullstartblock(int k)
   1717{
   1718	ASSERT(k < (1 << STARTBLOCKVALBITS));
   1719	return STARTBLOCKMASK | (k);
   1720}
   1721
   1722static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
   1723{
   1724	return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
   1725}
   1726
   1727/*
   1728 * Key structure for non-leaf levels of the tree.
   1729 */
   1730typedef struct xfs_bmbt_key {
   1731	__be64		br_startoff;	/* starting file offset */
   1732} xfs_bmbt_key_t, xfs_bmdr_key_t;
   1733
   1734/* btree pointer type */
   1735typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
   1736
   1737
   1738/*
   1739 * Generic Btree block format definitions
   1740 *
   1741 * This is a combination of the actual format used on disk for short and long
   1742 * format btrees.  The first three fields are shared by both format, but the
   1743 * pointers are different and should be used with care.
   1744 *
   1745 * To get the size of the actual short or long form headers please use the size
   1746 * macros below.  Never use sizeof(xfs_btree_block).
   1747 *
   1748 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems
   1749 * with the crc feature bit, and all accesses to them must be conditional on
   1750 * that flag.
   1751 */
   1752/* short form block header */
   1753struct xfs_btree_block_shdr {
   1754	__be32		bb_leftsib;
   1755	__be32		bb_rightsib;
   1756
   1757	__be64		bb_blkno;
   1758	__be64		bb_lsn;
   1759	uuid_t		bb_uuid;
   1760	__be32		bb_owner;
   1761	__le32		bb_crc;
   1762};
   1763
   1764/* long form block header */
   1765struct xfs_btree_block_lhdr {
   1766	__be64		bb_leftsib;
   1767	__be64		bb_rightsib;
   1768
   1769	__be64		bb_blkno;
   1770	__be64		bb_lsn;
   1771	uuid_t		bb_uuid;
   1772	__be64		bb_owner;
   1773	__le32		bb_crc;
   1774	__be32		bb_pad; /* padding for alignment */
   1775};
   1776
   1777struct xfs_btree_block {
   1778	__be32		bb_magic;	/* magic number for block type */
   1779	__be16		bb_level;	/* 0 is a leaf */
   1780	__be16		bb_numrecs;	/* current # of data records */
   1781	union {
   1782		struct xfs_btree_block_shdr s;
   1783		struct xfs_btree_block_lhdr l;
   1784	} bb_u;				/* rest */
   1785};
   1786
   1787/* size of a short form block */
   1788#define XFS_BTREE_SBLOCK_LEN \
   1789	(offsetof(struct xfs_btree_block, bb_u) + \
   1790	 offsetof(struct xfs_btree_block_shdr, bb_blkno))
   1791/* size of a long form block */
   1792#define XFS_BTREE_LBLOCK_LEN \
   1793	(offsetof(struct xfs_btree_block, bb_u) + \
   1794	 offsetof(struct xfs_btree_block_lhdr, bb_blkno))
   1795
   1796/* sizes of CRC enabled btree blocks */
   1797#define XFS_BTREE_SBLOCK_CRC_LEN \
   1798	(offsetof(struct xfs_btree_block, bb_u) + \
   1799	 sizeof(struct xfs_btree_block_shdr))
   1800#define XFS_BTREE_LBLOCK_CRC_LEN \
   1801	(offsetof(struct xfs_btree_block, bb_u) + \
   1802	 sizeof(struct xfs_btree_block_lhdr))
   1803
   1804#define XFS_BTREE_SBLOCK_CRC_OFF \
   1805	offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
   1806#define XFS_BTREE_LBLOCK_CRC_OFF \
   1807	offsetof(struct xfs_btree_block, bb_u.l.bb_crc)
   1808
   1809/*
   1810 * On-disk XFS access control list structure.
   1811 */
   1812struct xfs_acl_entry {
   1813	__be32	ae_tag;
   1814	__be32	ae_id;
   1815	__be16	ae_perm;
   1816	__be16	ae_pad;		/* fill the implicit hole in the structure */
   1817};
   1818
   1819struct xfs_acl {
   1820	__be32			acl_cnt;
   1821	struct xfs_acl_entry	acl_entry[];
   1822};
   1823
   1824/*
   1825 * The number of ACL entries allowed is defined by the on-disk format.
   1826 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
   1827 * limited only by the maximum size of the xattr that stores the information.
   1828 */
   1829#define XFS_ACL_MAX_ENTRIES(mp)	\
   1830	(xfs_has_crc(mp) \
   1831		?  (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
   1832						sizeof(struct xfs_acl_entry) \
   1833		: 25)
   1834
   1835#define XFS_ACL_SIZE(cnt) \
   1836	(sizeof(struct xfs_acl) + \
   1837		sizeof(struct xfs_acl_entry) * cnt)
   1838
   1839#define XFS_ACL_MAX_SIZE(mp) \
   1840	XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp)))
   1841
   1842
   1843/* On-disk XFS extended attribute names */
   1844#define SGI_ACL_FILE		"SGI_ACL_FILE"
   1845#define SGI_ACL_DEFAULT		"SGI_ACL_DEFAULT"
   1846#define SGI_ACL_FILE_SIZE	(sizeof(SGI_ACL_FILE)-1)
   1847#define SGI_ACL_DEFAULT_SIZE	(sizeof(SGI_ACL_DEFAULT)-1)
   1848
   1849#endif /* __XFS_FORMAT_H__ */