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97c69ba1c0
Zoned devices can have gaps beyond the usable capacity of a zone and the end in the LBA/daddr address space. In other words, the hardware equivalent to the RT groups already takes care of the power of 2 alignment for us. In this case the sparse FSB/RTB address space maps 1:1 to the device address space. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
2024 lines
69 KiB
C
2024 lines
69 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#ifndef __XFS_FORMAT_H__
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#define __XFS_FORMAT_H__
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/*
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* XFS On Disk Format Definitions
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*
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* This header file defines all the on-disk format definitions for
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* general XFS objects. Directory and attribute related objects are defined in
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* xfs_da_format.h, which log and log item formats are defined in
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* xfs_log_format.h. Everything else goes here.
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*/
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struct xfs_mount;
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struct xfs_trans;
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struct xfs_inode;
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struct xfs_buf;
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struct xfs_ifork;
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/*
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* Super block
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* Fits into a sector-sized buffer at address 0 of each allocation group.
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* Only the first of these is ever updated except during growfs.
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*/
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#define XFS_SB_MAGIC 0x58465342 /* 'XFSB' */
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#define XFS_SB_VERSION_1 1 /* 5.3, 6.0.1, 6.1 */
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#define XFS_SB_VERSION_2 2 /* 6.2 - attributes */
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#define XFS_SB_VERSION_3 3 /* 6.2 - new inode version */
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#define XFS_SB_VERSION_4 4 /* 6.2+ - bitmask version */
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#define XFS_SB_VERSION_5 5 /* CRC enabled filesystem */
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#define XFS_SB_VERSION_NUMBITS 0x000f
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#define XFS_SB_VERSION_ALLFBITS 0xfff0
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#define XFS_SB_VERSION_ATTRBIT 0x0010
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#define XFS_SB_VERSION_NLINKBIT 0x0020
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#define XFS_SB_VERSION_QUOTABIT 0x0040
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#define XFS_SB_VERSION_ALIGNBIT 0x0080
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#define XFS_SB_VERSION_DALIGNBIT 0x0100
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#define XFS_SB_VERSION_SHAREDBIT 0x0200
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#define XFS_SB_VERSION_LOGV2BIT 0x0400
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#define XFS_SB_VERSION_SECTORBIT 0x0800
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#define XFS_SB_VERSION_EXTFLGBIT 0x1000
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#define XFS_SB_VERSION_DIRV2BIT 0x2000
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#define XFS_SB_VERSION_BORGBIT 0x4000 /* ASCII only case-insens. */
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#define XFS_SB_VERSION_MOREBITSBIT 0x8000
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/*
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* The size of a single extended attribute on disk is limited by
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* the size of index values within the attribute entries themselves.
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* These are be16 fields, so we can only support attribute data
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* sizes up to 2^16 bytes in length.
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*/
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#define XFS_XATTR_SIZE_MAX (1 << 16)
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/*
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* Supported feature bit list is just all bits in the versionnum field because
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* we've used them all up and understand them all. Except, of course, for the
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* shared superblock bit, which nobody knows what it does and so is unsupported.
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*/
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#define XFS_SB_VERSION_OKBITS \
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((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \
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~XFS_SB_VERSION_SHAREDBIT)
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/*
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* There are two words to hold XFS "feature" bits: the original
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* word, sb_versionnum, and sb_features2. Whenever a bit is set in
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* sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
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*
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* These defines represent bits in sb_features2.
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*/
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#define XFS_SB_VERSION2_RESERVED1BIT 0x00000001
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#define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */
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#define XFS_SB_VERSION2_RESERVED4BIT 0x00000004
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#define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */
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#define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */
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#define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */
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#define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */
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#define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */
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#define XFS_SB_VERSION2_OKBITS \
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(XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
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XFS_SB_VERSION2_ATTR2BIT | \
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XFS_SB_VERSION2_PROJID32BIT | \
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XFS_SB_VERSION2_FTYPE)
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/* Maximum size of the xfs filesystem label, no terminating NULL */
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#define XFSLABEL_MAX 12
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/*
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* Superblock - in core version. Must be padded to 64 bit alignment.
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*/
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typedef struct xfs_sb {
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uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */
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uint32_t sb_blocksize; /* logical block size, bytes */
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xfs_rfsblock_t sb_dblocks; /* number of data blocks */
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xfs_rfsblock_t sb_rblocks; /* number of realtime blocks */
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xfs_rtbxlen_t sb_rextents; /* number of realtime extents */
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uuid_t sb_uuid; /* user-visible file system unique id */
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xfs_fsblock_t sb_logstart; /* starting block of log if internal */
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xfs_ino_t sb_rootino; /* root inode number */
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xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */
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xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */
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xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */
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xfs_agblock_t sb_agblocks; /* size of an allocation group */
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xfs_agnumber_t sb_agcount; /* number of allocation groups */
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xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */
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xfs_extlen_t sb_logblocks; /* number of log blocks */
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uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */
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uint16_t sb_sectsize; /* volume sector size, bytes */
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uint16_t sb_inodesize; /* inode size, bytes */
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uint16_t sb_inopblock; /* inodes per block */
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char sb_fname[XFSLABEL_MAX]; /* file system name */
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uint8_t sb_blocklog; /* log2 of sb_blocksize */
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uint8_t sb_sectlog; /* log2 of sb_sectsize */
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uint8_t sb_inodelog; /* log2 of sb_inodesize */
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uint8_t sb_inopblog; /* log2 of sb_inopblock */
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uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */
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uint8_t sb_rextslog; /* log2 of sb_rextents */
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uint8_t sb_inprogress; /* mkfs is in progress, don't mount */
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uint8_t sb_imax_pct; /* max % of fs for inode space */
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/* statistics */
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/*
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* These fields must remain contiguous. If you really
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* want to change their layout, make sure you fix the
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* code in xfs_trans_apply_sb_deltas().
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*/
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uint64_t sb_icount; /* allocated inodes */
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uint64_t sb_ifree; /* free inodes */
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uint64_t sb_fdblocks; /* free data blocks */
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uint64_t sb_frextents; /* free realtime extents */
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/*
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* End contiguous fields.
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*/
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xfs_ino_t sb_uquotino; /* user quota inode */
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xfs_ino_t sb_gquotino; /* group quota inode */
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uint16_t sb_qflags; /* quota flags */
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uint8_t sb_flags; /* misc. flags */
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uint8_t sb_shared_vn; /* shared version number */
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xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */
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uint32_t sb_unit; /* stripe or raid unit */
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uint32_t sb_width; /* stripe or raid width */
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uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */
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uint8_t sb_logsectlog; /* log2 of the log sector size */
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uint16_t sb_logsectsize; /* sector size for the log, bytes */
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uint32_t sb_logsunit; /* stripe unit size for the log */
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uint32_t sb_features2; /* additional feature bits */
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/*
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* bad features2 field as a result of failing to pad the sb structure to
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* 64 bits. Some machines will be using this field for features2 bits.
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* Easiest just to mark it bad and not use it for anything else.
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*
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* This is not kept up to date in memory; it is always overwritten by
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* the value in sb_features2 when formatting the incore superblock to
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* the disk buffer.
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*/
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uint32_t sb_bad_features2;
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/* version 5 superblock fields start here */
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/* feature masks */
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uint32_t sb_features_compat;
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uint32_t sb_features_ro_compat;
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uint32_t sb_features_incompat;
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uint32_t sb_features_log_incompat;
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uint32_t sb_crc; /* superblock crc */
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xfs_extlen_t sb_spino_align; /* sparse inode chunk alignment */
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xfs_ino_t sb_pquotino; /* project quota inode */
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xfs_lsn_t sb_lsn; /* last write sequence */
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uuid_t sb_meta_uuid; /* metadata file system unique id */
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xfs_ino_t sb_metadirino; /* metadata directory tree root */
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xfs_rgnumber_t sb_rgcount; /* number of realtime groups */
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xfs_rtxlen_t sb_rgextents; /* size of a realtime group in rtx */
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uint8_t sb_rgblklog; /* rt group number shift */
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uint8_t sb_pad[7]; /* zeroes */
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xfs_rfsblock_t sb_rtstart; /* start of internal RT section (FSB) */
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xfs_filblks_t sb_rtreserved; /* reserved (zoned) RT blocks */
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/* must be padded to 64 bit alignment */
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} xfs_sb_t;
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/*
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* Superblock - on disk version.
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* Must be padded to 64 bit alignment.
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*/
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struct xfs_dsb {
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__be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */
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__be32 sb_blocksize; /* logical block size, bytes */
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__be64 sb_dblocks; /* number of data blocks */
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__be64 sb_rblocks; /* number of realtime blocks */
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__be64 sb_rextents; /* number of realtime extents */
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uuid_t sb_uuid; /* user-visible file system unique id */
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__be64 sb_logstart; /* starting block of log if internal */
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__be64 sb_rootino; /* root inode number */
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__be64 sb_rbmino; /* bitmap inode for realtime extents */
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__be64 sb_rsumino; /* summary inode for rt bitmap */
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__be32 sb_rextsize; /* realtime extent size, blocks */
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__be32 sb_agblocks; /* size of an allocation group */
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__be32 sb_agcount; /* number of allocation groups */
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__be32 sb_rbmblocks; /* number of rt bitmap blocks */
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__be32 sb_logblocks; /* number of log blocks */
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__be16 sb_versionnum; /* header version == XFS_SB_VERSION */
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__be16 sb_sectsize; /* volume sector size, bytes */
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__be16 sb_inodesize; /* inode size, bytes */
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__be16 sb_inopblock; /* inodes per block */
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char sb_fname[XFSLABEL_MAX]; /* file system name */
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__u8 sb_blocklog; /* log2 of sb_blocksize */
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__u8 sb_sectlog; /* log2 of sb_sectsize */
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__u8 sb_inodelog; /* log2 of sb_inodesize */
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__u8 sb_inopblog; /* log2 of sb_inopblock */
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__u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */
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__u8 sb_rextslog; /* log2 of sb_rextents */
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__u8 sb_inprogress; /* mkfs is in progress, don't mount */
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__u8 sb_imax_pct; /* max % of fs for inode space */
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/* statistics */
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/*
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* These fields must remain contiguous. If you really
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* want to change their layout, make sure you fix the
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* code in xfs_trans_apply_sb_deltas().
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*/
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__be64 sb_icount; /* allocated inodes */
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__be64 sb_ifree; /* free inodes */
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__be64 sb_fdblocks; /* free data blocks */
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__be64 sb_frextents; /* free realtime extents */
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/*
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* End contiguous fields.
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*/
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__be64 sb_uquotino; /* user quota inode */
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__be64 sb_gquotino; /* group quota inode */
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__be16 sb_qflags; /* quota flags */
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__u8 sb_flags; /* misc. flags */
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__u8 sb_shared_vn; /* shared version number */
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__be32 sb_inoalignmt; /* inode chunk alignment, fsblocks */
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__be32 sb_unit; /* stripe or raid unit */
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__be32 sb_width; /* stripe or raid width */
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__u8 sb_dirblklog; /* log2 of dir block size (fsbs) */
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__u8 sb_logsectlog; /* log2 of the log sector size */
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__be16 sb_logsectsize; /* sector size for the log, bytes */
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__be32 sb_logsunit; /* stripe unit size for the log */
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__be32 sb_features2; /* additional feature bits */
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/*
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* bad features2 field as a result of failing to pad the sb
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* structure to 64 bits. Some machines will be using this field
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* for features2 bits. Easiest just to mark it bad and not use
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* it for anything else.
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*/
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__be32 sb_bad_features2;
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/* version 5 superblock fields start here */
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/* feature masks */
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__be32 sb_features_compat;
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__be32 sb_features_ro_compat;
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__be32 sb_features_incompat;
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__be32 sb_features_log_incompat;
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__le32 sb_crc; /* superblock crc */
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__be32 sb_spino_align; /* sparse inode chunk alignment */
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__be64 sb_pquotino; /* project quota inode */
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__be64 sb_lsn; /* last write sequence */
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uuid_t sb_meta_uuid; /* metadata file system unique id */
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__be64 sb_metadirino; /* metadata directory tree root */
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__be32 sb_rgcount; /* # of realtime groups */
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__be32 sb_rgextents; /* size of rtgroup in rtx */
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__u8 sb_rgblklog; /* rt group number shift */
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__u8 sb_pad[7]; /* zeroes */
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__be64 sb_rtstart; /* start of internal RT section (FSB) */
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__be64 sb_rtreserved; /* reserved (zoned) RT blocks */
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/*
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* The size of this structure must be padded to 64 bit alignment.
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*
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* NOTE: Don't forget to update secondary_sb_whack in xfs_repair when
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* adding new fields here.
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*/
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};
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#define XFS_SB_CRC_OFF offsetof(struct xfs_dsb, sb_crc)
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/*
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* Misc. Flags - warning - these will be cleared by xfs_repair unless
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* a feature bit is set when the flag is used.
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*/
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#define XFS_SBF_NOFLAGS 0x00 /* no flags set */
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#define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */
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/*
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* define max. shared version we can interoperate with
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*/
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#define XFS_SB_MAX_SHARED_VN 0
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#define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
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static inline bool xfs_sb_is_v5(const struct xfs_sb *sbp)
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{
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return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
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}
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/*
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* Detect a mismatched features2 field. Older kernels read/wrote
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* this into the wrong slot, so to be safe we keep them in sync.
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*/
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static inline bool xfs_sb_has_mismatched_features2(const struct xfs_sb *sbp)
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{
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return sbp->sb_bad_features2 != sbp->sb_features2;
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}
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static inline bool xfs_sb_version_hasmorebits(const struct xfs_sb *sbp)
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{
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return xfs_sb_is_v5(sbp) ||
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(sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
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}
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static inline void xfs_sb_version_addattr(struct xfs_sb *sbp)
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{
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sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
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}
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static inline void xfs_sb_version_addquota(struct xfs_sb *sbp)
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{
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sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
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}
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static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp)
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{
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sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
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sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
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}
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static inline void xfs_sb_version_addprojid32(struct xfs_sb *sbp)
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{
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sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
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sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT;
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}
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/*
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* Extended v5 superblock feature masks. These are to be used for new v5
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* superblock features only.
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*
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* Compat features are new features that old kernels will not notice or affect
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* and so can mount read-write without issues.
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*
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* RO-Compat (read only) are features that old kernels can read but will break
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* if they write. Hence only read-only mounts of such filesystems are allowed on
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* kernels that don't support the feature bit.
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*
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* InCompat features are features which old kernels will not understand and so
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* must not mount.
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*
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* Log-InCompat features are for changes to log formats or new transactions that
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* can't be replayed on older kernels. The fields are set when the filesystem is
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* mounted, and a clean unmount clears the fields.
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*/
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#define XFS_SB_FEAT_COMPAT_ALL 0
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#define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL
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static inline bool
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xfs_sb_has_compat_feature(
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const struct xfs_sb *sbp,
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uint32_t feature)
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{
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return (sbp->sb_features_compat & feature) != 0;
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}
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#define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */
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#define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */
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#define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */
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#define XFS_SB_FEAT_RO_COMPAT_INOBTCNT (1 << 3) /* inobt block counts */
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#define XFS_SB_FEAT_RO_COMPAT_ALL \
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(XFS_SB_FEAT_RO_COMPAT_FINOBT | \
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XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
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XFS_SB_FEAT_RO_COMPAT_REFLINK| \
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XFS_SB_FEAT_RO_COMPAT_INOBTCNT)
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#define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
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static inline bool
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xfs_sb_has_ro_compat_feature(
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const struct xfs_sb *sbp,
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uint32_t feature)
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{
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return (sbp->sb_features_ro_compat & feature) != 0;
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}
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#define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */
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#define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */
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#define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */
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#define XFS_SB_FEAT_INCOMPAT_BIGTIME (1 << 3) /* large timestamps */
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#define XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR (1 << 4) /* needs xfs_repair */
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#define XFS_SB_FEAT_INCOMPAT_NREXT64 (1 << 5) /* large extent counters */
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#define XFS_SB_FEAT_INCOMPAT_EXCHRANGE (1 << 6) /* exchangerange supported */
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#define XFS_SB_FEAT_INCOMPAT_PARENT (1 << 7) /* parent pointers */
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#define XFS_SB_FEAT_INCOMPAT_METADIR (1 << 8) /* metadata dir tree */
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#define XFS_SB_FEAT_INCOMPAT_ZONED (1 << 9) /* zoned RT allocator */
|
|
#define XFS_SB_FEAT_INCOMPAT_ZONE_GAPS (1 << 10) /* RTGs have LBA gaps */
|
|
|
|
#define XFS_SB_FEAT_INCOMPAT_ALL \
|
|
(XFS_SB_FEAT_INCOMPAT_FTYPE | \
|
|
XFS_SB_FEAT_INCOMPAT_SPINODES | \
|
|
XFS_SB_FEAT_INCOMPAT_META_UUID | \
|
|
XFS_SB_FEAT_INCOMPAT_BIGTIME | \
|
|
XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR | \
|
|
XFS_SB_FEAT_INCOMPAT_NREXT64 | \
|
|
XFS_SB_FEAT_INCOMPAT_EXCHRANGE | \
|
|
XFS_SB_FEAT_INCOMPAT_PARENT | \
|
|
XFS_SB_FEAT_INCOMPAT_METADIR | \
|
|
XFS_SB_FEAT_INCOMPAT_ZONED | \
|
|
XFS_SB_FEAT_INCOMPAT_ZONE_GAPS)
|
|
|
|
#define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL
|
|
static inline bool
|
|
xfs_sb_has_incompat_feature(
|
|
const struct xfs_sb *sbp,
|
|
uint32_t feature)
|
|
{
|
|
return (sbp->sb_features_incompat & feature) != 0;
|
|
}
|
|
|
|
#define XFS_SB_FEAT_INCOMPAT_LOG_XATTRS (1 << 0) /* Delayed Attributes */
|
|
#define XFS_SB_FEAT_INCOMPAT_LOG_ALL \
|
|
(XFS_SB_FEAT_INCOMPAT_LOG_XATTRS)
|
|
#define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
|
|
static inline bool
|
|
xfs_sb_has_incompat_log_feature(
|
|
const struct xfs_sb *sbp,
|
|
uint32_t feature)
|
|
{
|
|
return (sbp->sb_features_log_incompat & feature) != 0;
|
|
}
|
|
|
|
static inline void
|
|
xfs_sb_remove_incompat_log_features(
|
|
struct xfs_sb *sbp)
|
|
{
|
|
sbp->sb_features_log_incompat &= ~XFS_SB_FEAT_INCOMPAT_LOG_ALL;
|
|
}
|
|
|
|
static inline void
|
|
xfs_sb_add_incompat_log_features(
|
|
struct xfs_sb *sbp,
|
|
unsigned int features)
|
|
{
|
|
sbp->sb_features_log_incompat |= features;
|
|
}
|
|
|
|
static inline bool xfs_sb_version_haslogxattrs(const struct xfs_sb *sbp)
|
|
{
|
|
return xfs_sb_is_v5(sbp) && (sbp->sb_features_log_incompat &
|
|
XFS_SB_FEAT_INCOMPAT_LOG_XATTRS);
|
|
}
|
|
|
|
static inline bool
|
|
xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
|
|
{
|
|
return (ino == sbp->sb_uquotino ||
|
|
ino == sbp->sb_gquotino ||
|
|
ino == sbp->sb_pquotino);
|
|
}
|
|
|
|
#define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */
|
|
#define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
|
|
|
|
#define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
|
|
#define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \
|
|
xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
|
|
#define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \
|
|
XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
|
|
|
|
/*
|
|
* File system sector to basic block conversions.
|
|
*/
|
|
#define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log)
|
|
|
|
/*
|
|
* File system block to basic block conversions.
|
|
*/
|
|
#define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
|
|
#define XFS_BB_TO_FSB(mp,bb) \
|
|
(((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
|
|
#define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log)
|
|
|
|
/*
|
|
* File system block to byte conversions.
|
|
*/
|
|
#define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
|
|
#define XFS_B_TO_FSB(mp,b) \
|
|
((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
|
|
#define XFS_B_TO_FSBT(mp,b) (((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
|
|
|
|
/*
|
|
* Allocation group header
|
|
*
|
|
* This is divided into three structures, placed in sequential 512-byte
|
|
* buffers after a copy of the superblock (also in a 512-byte buffer).
|
|
*/
|
|
#define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */
|
|
#define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */
|
|
#define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */
|
|
#define XFS_AGF_VERSION 1
|
|
#define XFS_AGI_VERSION 1
|
|
|
|
#define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
|
|
#define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
typedef struct xfs_agf {
|
|
/*
|
|
* Common allocation group header information
|
|
*/
|
|
__be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */
|
|
__be32 agf_versionnum; /* header version == XFS_AGF_VERSION */
|
|
__be32 agf_seqno; /* sequence # starting from 0 */
|
|
__be32 agf_length; /* size in blocks of a.g. */
|
|
/*
|
|
* Freespace and rmap information
|
|
*/
|
|
__be32 agf_bno_root; /* bnobt root block */
|
|
__be32 agf_cnt_root; /* cntbt root block */
|
|
__be32 agf_rmap_root; /* rmapbt root block */
|
|
|
|
__be32 agf_bno_level; /* bnobt btree levels */
|
|
__be32 agf_cnt_level; /* cntbt btree levels */
|
|
__be32 agf_rmap_level; /* rmapbt btree levels */
|
|
|
|
__be32 agf_flfirst; /* first freelist block's index */
|
|
__be32 agf_fllast; /* last freelist block's index */
|
|
__be32 agf_flcount; /* count of blocks in freelist */
|
|
__be32 agf_freeblks; /* total free blocks */
|
|
|
|
__be32 agf_longest; /* longest free space */
|
|
__be32 agf_btreeblks; /* # of blocks held in AGF btrees */
|
|
uuid_t agf_uuid; /* uuid of filesystem */
|
|
|
|
__be32 agf_rmap_blocks; /* rmapbt blocks used */
|
|
__be32 agf_refcount_blocks; /* refcountbt blocks used */
|
|
|
|
__be32 agf_refcount_root; /* refcount tree root block */
|
|
__be32 agf_refcount_level; /* refcount btree levels */
|
|
|
|
/*
|
|
* reserve some contiguous space for future logged fields before we add
|
|
* the unlogged fields. This makes the range logging via flags and
|
|
* structure offsets much simpler.
|
|
*/
|
|
__be64 agf_spare64[14];
|
|
|
|
/* unlogged fields, written during buffer writeback. */
|
|
__be64 agf_lsn; /* last write sequence */
|
|
__be32 agf_crc; /* crc of agf sector */
|
|
__be32 agf_spare2;
|
|
|
|
/* structure must be padded to 64 bit alignment */
|
|
} xfs_agf_t;
|
|
|
|
#define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc)
|
|
|
|
#define XFS_AGF_MAGICNUM (1u << 0)
|
|
#define XFS_AGF_VERSIONNUM (1u << 1)
|
|
#define XFS_AGF_SEQNO (1u << 2)
|
|
#define XFS_AGF_LENGTH (1u << 3)
|
|
#define XFS_AGF_ROOTS (1u << 4)
|
|
#define XFS_AGF_LEVELS (1u << 5)
|
|
#define XFS_AGF_FLFIRST (1u << 6)
|
|
#define XFS_AGF_FLLAST (1u << 7)
|
|
#define XFS_AGF_FLCOUNT (1u << 8)
|
|
#define XFS_AGF_FREEBLKS (1u << 9)
|
|
#define XFS_AGF_LONGEST (1u << 10)
|
|
#define XFS_AGF_BTREEBLKS (1u << 11)
|
|
#define XFS_AGF_UUID (1u << 12)
|
|
#define XFS_AGF_RMAP_BLOCKS (1u << 13)
|
|
#define XFS_AGF_REFCOUNT_BLOCKS (1u << 14)
|
|
#define XFS_AGF_REFCOUNT_ROOT (1u << 15)
|
|
#define XFS_AGF_REFCOUNT_LEVEL (1u << 16)
|
|
#define XFS_AGF_SPARE64 (1u << 17)
|
|
#define XFS_AGF_NUM_BITS 18
|
|
#define XFS_AGF_ALL_BITS ((1u << XFS_AGF_NUM_BITS) - 1)
|
|
|
|
#define XFS_AGF_FLAGS \
|
|
{ XFS_AGF_MAGICNUM, "MAGICNUM" }, \
|
|
{ XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \
|
|
{ XFS_AGF_SEQNO, "SEQNO" }, \
|
|
{ XFS_AGF_LENGTH, "LENGTH" }, \
|
|
{ XFS_AGF_ROOTS, "ROOTS" }, \
|
|
{ XFS_AGF_LEVELS, "LEVELS" }, \
|
|
{ XFS_AGF_FLFIRST, "FLFIRST" }, \
|
|
{ XFS_AGF_FLLAST, "FLLAST" }, \
|
|
{ XFS_AGF_FLCOUNT, "FLCOUNT" }, \
|
|
{ XFS_AGF_FREEBLKS, "FREEBLKS" }, \
|
|
{ XFS_AGF_LONGEST, "LONGEST" }, \
|
|
{ XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \
|
|
{ XFS_AGF_UUID, "UUID" }, \
|
|
{ XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \
|
|
{ XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \
|
|
{ XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \
|
|
{ XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \
|
|
{ XFS_AGF_SPARE64, "SPARE64" }
|
|
|
|
/* disk block (xfs_daddr_t) in the AG */
|
|
#define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
|
|
#define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
|
|
|
|
/*
|
|
* Size of the unlinked inode hash table in the agi.
|
|
*/
|
|
#define XFS_AGI_UNLINKED_BUCKETS 64
|
|
|
|
typedef struct xfs_agi {
|
|
/*
|
|
* Common allocation group header information
|
|
*/
|
|
__be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */
|
|
__be32 agi_versionnum; /* header version == XFS_AGI_VERSION */
|
|
__be32 agi_seqno; /* sequence # starting from 0 */
|
|
__be32 agi_length; /* size in blocks of a.g. */
|
|
/*
|
|
* Inode information
|
|
* Inodes are mapped by interpreting the inode number, so no
|
|
* mapping data is needed here.
|
|
*/
|
|
__be32 agi_count; /* count of allocated inodes */
|
|
__be32 agi_root; /* root of inode btree */
|
|
__be32 agi_level; /* levels in inode btree */
|
|
__be32 agi_freecount; /* number of free inodes */
|
|
|
|
__be32 agi_newino; /* new inode just allocated */
|
|
__be32 agi_dirino; /* last directory inode chunk */
|
|
/*
|
|
* Hash table of inodes which have been unlinked but are
|
|
* still being referenced.
|
|
*/
|
|
__be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
|
|
/*
|
|
* This marks the end of logging region 1 and start of logging region 2.
|
|
*/
|
|
uuid_t agi_uuid; /* uuid of filesystem */
|
|
__be32 agi_crc; /* crc of agi sector */
|
|
__be32 agi_pad32;
|
|
__be64 agi_lsn; /* last write sequence */
|
|
|
|
__be32 agi_free_root; /* root of the free inode btree */
|
|
__be32 agi_free_level;/* levels in free inode btree */
|
|
|
|
__be32 agi_iblocks; /* inobt blocks used */
|
|
__be32 agi_fblocks; /* finobt blocks used */
|
|
|
|
/* structure must be padded to 64 bit alignment */
|
|
} xfs_agi_t;
|
|
|
|
#define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc)
|
|
|
|
#define XFS_AGI_MAGICNUM (1u << 0)
|
|
#define XFS_AGI_VERSIONNUM (1u << 1)
|
|
#define XFS_AGI_SEQNO (1u << 2)
|
|
#define XFS_AGI_LENGTH (1u << 3)
|
|
#define XFS_AGI_COUNT (1u << 4)
|
|
#define XFS_AGI_ROOT (1u << 5)
|
|
#define XFS_AGI_LEVEL (1u << 6)
|
|
#define XFS_AGI_FREECOUNT (1u << 7)
|
|
#define XFS_AGI_NEWINO (1u << 8)
|
|
#define XFS_AGI_DIRINO (1u << 9)
|
|
#define XFS_AGI_UNLINKED (1u << 10)
|
|
#define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */
|
|
#define XFS_AGI_ALL_BITS_R1 ((1u << XFS_AGI_NUM_BITS_R1) - 1)
|
|
#define XFS_AGI_FREE_ROOT (1u << 11)
|
|
#define XFS_AGI_FREE_LEVEL (1u << 12)
|
|
#define XFS_AGI_IBLOCKS (1u << 13) /* both inobt/finobt block counters */
|
|
#define XFS_AGI_NUM_BITS_R2 14
|
|
|
|
/* disk block (xfs_daddr_t) in the AG */
|
|
#define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
|
|
#define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
|
|
|
|
/*
|
|
* The third a.g. block contains the a.g. freelist, an array
|
|
* of block pointers to blocks owned by the allocation btree code.
|
|
*/
|
|
#define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
|
|
#define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
|
|
#define XFS_BUF_TO_AGFL(bp) ((struct xfs_agfl *)((bp)->b_addr))
|
|
|
|
struct xfs_agfl {
|
|
__be32 agfl_magicnum;
|
|
__be32 agfl_seqno;
|
|
uuid_t agfl_uuid;
|
|
__be64 agfl_lsn;
|
|
__be32 agfl_crc;
|
|
} __attribute__((packed));
|
|
|
|
#define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc)
|
|
|
|
#define XFS_AGB_TO_FSB(mp,agno,agbno) \
|
|
(((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
|
|
#define XFS_FSB_TO_AGNO(mp,fsbno) \
|
|
((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
|
|
#define XFS_FSB_TO_AGBNO(mp,fsbno) \
|
|
((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
|
|
#define XFS_AGB_TO_DADDR(mp,agno,agbno) \
|
|
((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
|
|
(xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
|
|
#define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
|
|
|
|
/*
|
|
* For checking for bad ranges of xfs_daddr_t's, covering multiple
|
|
* allocation groups or a single xfs_daddr_t that's a superblock copy.
|
|
*/
|
|
#define XFS_AG_CHECK_DADDR(mp,d,len) \
|
|
((len) == 1 ? \
|
|
ASSERT((d) == XFS_SB_DADDR || \
|
|
xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
|
|
ASSERT(xfs_daddr_to_agno(mp, d) == \
|
|
xfs_daddr_to_agno(mp, (d) + (len) - 1)))
|
|
|
|
/*
|
|
* 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 */
|
|
unsigned char 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 */
|
|
|
|
/* must be padded to 64 bit alignment */
|
|
};
|
|
|
|
#define XFS_RTSB_CRC_OFF offsetof(struct xfs_rtsb, rsb_crc)
|
|
#define XFS_RTSB_DADDR ((xfs_daddr_t)0) /* daddr in rt section */
|
|
|
|
/*
|
|
* XFS Timestamps
|
|
* ==============
|
|
*
|
|
* Traditional ondisk inode timestamps consist of signed 32-bit counters for
|
|
* seconds and nanoseconds; time zero is the Unix epoch, Jan 1 00:00:00 UTC
|
|
* 1970, which means that the timestamp epoch is the same as the Unix epoch.
|
|
* Therefore, the ondisk min and max defined here can be used directly to
|
|
* constrain the incore timestamps on a Unix system. Note that we actually
|
|
* encode a __be64 value on disk.
|
|
*
|
|
* When the bigtime feature is enabled, ondisk inode timestamps become an
|
|
* unsigned 64-bit nanoseconds counter. This means that the bigtime inode
|
|
* timestamp epoch is the start of the classic timestamp range, which is
|
|
* Dec 13 20:45:52 UTC 1901. Because the epochs are not the same, callers
|
|
* /must/ use the bigtime conversion functions when encoding and decoding raw
|
|
* timestamps.
|
|
*/
|
|
typedef __be64 xfs_timestamp_t;
|
|
|
|
/* Legacy timestamp encoding format. */
|
|
struct xfs_legacy_timestamp {
|
|
__be32 t_sec; /* timestamp seconds */
|
|
__be32 t_nsec; /* timestamp nanoseconds */
|
|
};
|
|
|
|
/*
|
|
* Smallest possible ondisk seconds value with traditional timestamps. This
|
|
* corresponds exactly with the incore timestamp Dec 13 20:45:52 UTC 1901.
|
|
*/
|
|
#define XFS_LEGACY_TIME_MIN ((int64_t)S32_MIN)
|
|
|
|
/*
|
|
* Largest possible ondisk seconds value with traditional timestamps. This
|
|
* corresponds exactly with the incore timestamp Jan 19 03:14:07 UTC 2038.
|
|
*/
|
|
#define XFS_LEGACY_TIME_MAX ((int64_t)S32_MAX)
|
|
|
|
/*
|
|
* Smallest possible ondisk seconds value with bigtime timestamps. This
|
|
* corresponds (after conversion to a Unix timestamp) with the traditional
|
|
* minimum timestamp of Dec 13 20:45:52 UTC 1901.
|
|
*/
|
|
#define XFS_BIGTIME_TIME_MIN ((int64_t)0)
|
|
|
|
/*
|
|
* Largest supported ondisk seconds value with bigtime timestamps. This
|
|
* corresponds (after conversion to a Unix timestamp) with an incore timestamp
|
|
* of Jul 2 20:20:24 UTC 2486.
|
|
*
|
|
* We round down the ondisk limit so that the bigtime quota and inode max
|
|
* timestamps will be the same.
|
|
*/
|
|
#define XFS_BIGTIME_TIME_MAX ((int64_t)((-1ULL / NSEC_PER_SEC) & ~0x3ULL))
|
|
|
|
/*
|
|
* Bigtime epoch is set exactly to the minimum time value that a traditional
|
|
* 32-bit timestamp can represent when using the Unix epoch as a reference.
|
|
* Hence the Unix epoch is at a fixed offset into the supported bigtime
|
|
* timestamp range.
|
|
*
|
|
* The bigtime epoch also matches the minimum value an on-disk 32-bit XFS
|
|
* timestamp can represent so we will not lose any fidelity in converting
|
|
* to/from unix and bigtime timestamps.
|
|
*
|
|
* The following conversion factor converts a seconds counter from the Unix
|
|
* epoch to the bigtime epoch.
|
|
*/
|
|
#define XFS_BIGTIME_EPOCH_OFFSET (-(int64_t)S32_MIN)
|
|
|
|
/* Convert a timestamp from the Unix epoch to the bigtime epoch. */
|
|
static inline uint64_t xfs_unix_to_bigtime(time64_t unix_seconds)
|
|
{
|
|
return (uint64_t)unix_seconds + XFS_BIGTIME_EPOCH_OFFSET;
|
|
}
|
|
|
|
/* Convert a timestamp from the bigtime epoch to the Unix epoch. */
|
|
static inline time64_t xfs_bigtime_to_unix(uint64_t ondisk_seconds)
|
|
{
|
|
return (time64_t)ondisk_seconds - XFS_BIGTIME_EPOCH_OFFSET;
|
|
}
|
|
|
|
enum xfs_metafile_type {
|
|
XFS_METAFILE_UNKNOWN, /* unknown */
|
|
XFS_METAFILE_DIR, /* metadir directory */
|
|
XFS_METAFILE_USRQUOTA, /* user quota */
|
|
XFS_METAFILE_GRPQUOTA, /* group quota */
|
|
XFS_METAFILE_PRJQUOTA, /* project quota */
|
|
XFS_METAFILE_RTBITMAP, /* rt bitmap */
|
|
XFS_METAFILE_RTSUMMARY, /* rt summary */
|
|
XFS_METAFILE_RTRMAP, /* rt rmap */
|
|
XFS_METAFILE_RTREFCOUNT, /* rt refcount */
|
|
|
|
XFS_METAFILE_MAX
|
|
} __packed;
|
|
|
|
#define XFS_METAFILE_TYPE_STR \
|
|
{ XFS_METAFILE_UNKNOWN, "unknown" }, \
|
|
{ XFS_METAFILE_DIR, "dir" }, \
|
|
{ XFS_METAFILE_USRQUOTA, "usrquota" }, \
|
|
{ XFS_METAFILE_GRPQUOTA, "grpquota" }, \
|
|
{ XFS_METAFILE_PRJQUOTA, "prjquota" }, \
|
|
{ XFS_METAFILE_RTBITMAP, "rtbitmap" }, \
|
|
{ XFS_METAFILE_RTSUMMARY, "rtsummary" }, \
|
|
{ XFS_METAFILE_RTRMAP, "rtrmap" }, \
|
|
{ XFS_METAFILE_RTREFCOUNT, "rtrefcount" }
|
|
|
|
/*
|
|
* 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 */
|
|
};
|
|
|
|
#define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc)
|
|
|
|
#define DI_MAX_FLUSH 0xffff
|
|
|
|
/*
|
|
* Size of the core inode on disk. Version 1 and 2 inodes have
|
|
* the same size, but version 3 has grown a few additional fields.
|
|
*/
|
|
static inline uint xfs_dinode_size(int version)
|
|
{
|
|
if (version == 3)
|
|
return sizeof(struct xfs_dinode);
|
|
return offsetof(struct xfs_dinode, di_crc);
|
|
}
|
|
|
|
/*
|
|
* The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
|
|
* Since the pathconf interface is signed, we use 2^31 - 1 instead.
|
|
*/
|
|
#define XFS_MAXLINK ((1U << 31) - 1U)
|
|
|
|
/*
|
|
* 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 */
|
|
};
|
|
|
|
#define XFS_INODE_FORMAT_STR \
|
|
{ XFS_DINODE_FMT_DEV, "dev" }, \
|
|
{ XFS_DINODE_FMT_LOCAL, "local" }, \
|
|
{ XFS_DINODE_FMT_EXTENTS, "extent" }, \
|
|
{ XFS_DINODE_FMT_BTREE, "btree" }, \
|
|
{ XFS_DINODE_FMT_UUID, "uuid" }, \
|
|
{ XFS_DINODE_FMT_META_BTREE, "meta_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)
|
|
|
|
/*
|
|
* Inode minimum and maximum sizes.
|
|
*/
|
|
#define XFS_DINODE_MIN_LOG 8
|
|
#define XFS_DINODE_MAX_LOG 11
|
|
#define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG)
|
|
#define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG)
|
|
|
|
/*
|
|
* Inode size for given fs.
|
|
*/
|
|
#define XFS_DINODE_SIZE(mp) \
|
|
(xfs_has_v3inodes(mp) ? \
|
|
sizeof(struct xfs_dinode) : \
|
|
offsetof(struct xfs_dinode, di_crc))
|
|
#define XFS_LITINO(mp) \
|
|
((mp)->m_sb.sb_inodesize - XFS_DINODE_SIZE(mp))
|
|
|
|
/*
|
|
* Inode data & attribute fork sizes, per inode.
|
|
*/
|
|
#define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3))
|
|
|
|
#define XFS_DFORK_DSIZE(dip,mp) \
|
|
((dip)->di_forkoff ? XFS_DFORK_BOFF(dip) : XFS_LITINO(mp))
|
|
#define XFS_DFORK_ASIZE(dip,mp) \
|
|
((dip)->di_forkoff ? XFS_LITINO(mp) - XFS_DFORK_BOFF(dip) : 0)
|
|
#define XFS_DFORK_SIZE(dip,mp,w) \
|
|
((w) == XFS_DATA_FORK ? \
|
|
XFS_DFORK_DSIZE(dip, mp) : \
|
|
XFS_DFORK_ASIZE(dip, mp))
|
|
|
|
#define XFS_DFORK_MAXEXT(dip, mp, w) \
|
|
(XFS_DFORK_SIZE(dip, mp, w) / sizeof(struct xfs_bmbt_rec))
|
|
|
|
/*
|
|
* Return pointers to the data or attribute forks.
|
|
*/
|
|
#define XFS_DFORK_DPTR(dip) \
|
|
((void *)dip + xfs_dinode_size(dip->di_version))
|
|
#define XFS_DFORK_APTR(dip) \
|
|
(XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
|
|
#define XFS_DFORK_PTR(dip,w) \
|
|
((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
|
|
|
|
#define XFS_DFORK_FORMAT(dip,w) \
|
|
((w) == XFS_DATA_FORK ? \
|
|
(dip)->di_format : \
|
|
(dip)->di_aformat)
|
|
|
|
/*
|
|
* For block and character special files the 32bit dev_t is stored at the
|
|
* beginning of the data fork.
|
|
*/
|
|
static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
|
|
{
|
|
return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
|
|
}
|
|
|
|
static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
|
|
{
|
|
*(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
|
|
}
|
|
|
|
/*
|
|
* Values for di_flags
|
|
*/
|
|
#define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */
|
|
#define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */
|
|
#define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */
|
|
#define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */
|
|
#define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */
|
|
#define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */
|
|
#define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */
|
|
#define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */
|
|
#define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */
|
|
#define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */
|
|
#define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */
|
|
#define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */
|
|
#define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */
|
|
#define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */
|
|
#define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */
|
|
/* Do not use bit 15, di_flags is legacy and unchanging now */
|
|
|
|
#define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT)
|
|
#define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT)
|
|
#define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT)
|
|
#define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT)
|
|
#define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT)
|
|
#define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT)
|
|
#define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT)
|
|
#define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT)
|
|
#define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT)
|
|
#define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT)
|
|
#define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
|
|
#define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT)
|
|
#define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
|
|
#define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT)
|
|
#define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT)
|
|
|
|
#define XFS_DIFLAG_ANY \
|
|
(XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
|
|
XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
|
|
XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
|
|
XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
|
|
XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
|
|
|
|
/*
|
|
* Values for di_flags2 These start by being exposed to userspace in the upper
|
|
* 16 bits of the XFS_XFLAG_s range.
|
|
*/
|
|
/* 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
|
|
|
|
#define XFS_DIFLAG2_DAX (1ULL << XFS_DIFLAG2_DAX_BIT)
|
|
#define XFS_DIFLAG2_REFLINK (1ULL << XFS_DIFLAG2_REFLINK_BIT)
|
|
#define XFS_DIFLAG2_COWEXTSIZE (1ULL << XFS_DIFLAG2_COWEXTSIZE_BIT)
|
|
#define XFS_DIFLAG2_BIGTIME (1ULL << XFS_DIFLAG2_BIGTIME_BIT)
|
|
#define XFS_DIFLAG2_NREXT64 (1ULL << XFS_DIFLAG2_NREXT64_BIT)
|
|
#define XFS_DIFLAG2_METADATA (1ULL << XFS_DIFLAG2_METADATA_BIT)
|
|
|
|
#define XFS_DIFLAG2_ANY \
|
|
(XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE | \
|
|
XFS_DIFLAG2_BIGTIME | XFS_DIFLAG2_NREXT64 | XFS_DIFLAG2_METADATA)
|
|
|
|
static inline bool xfs_dinode_has_bigtime(const struct xfs_dinode *dip)
|
|
{
|
|
return dip->di_version >= 3 &&
|
|
(dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_BIGTIME));
|
|
}
|
|
|
|
static inline bool xfs_dinode_has_large_extent_counts(
|
|
const struct xfs_dinode *dip)
|
|
{
|
|
return dip->di_version >= 3 &&
|
|
(dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_NREXT64));
|
|
}
|
|
|
|
static inline bool xfs_dinode_is_metadir(const struct xfs_dinode *dip)
|
|
{
|
|
return dip->di_version >= 3 &&
|
|
(dip->di_flags2 & cpu_to_be64(XFS_DIFLAG2_METADATA));
|
|
}
|
|
|
|
/*
|
|
* Inode number format:
|
|
* low inopblog bits - offset in block
|
|
* next agblklog bits - block number in ag
|
|
* next agno_log bits - ag number
|
|
* high agno_log-agblklog-inopblog bits - 0
|
|
*/
|
|
#define XFS_INO_MASK(k) (uint32_t)((1ULL << (k)) - 1)
|
|
#define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog
|
|
#define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog
|
|
#define XFS_INO_AGINO_BITS(mp) ((mp)->m_ino_geo.agino_log)
|
|
#define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log
|
|
#define XFS_INO_BITS(mp) \
|
|
XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
|
|
#define XFS_INO_TO_AGNO(mp,i) \
|
|
((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
|
|
#define XFS_INO_TO_AGINO(mp,i) \
|
|
((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
|
|
#define XFS_INO_TO_AGBNO(mp,i) \
|
|
(((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
|
|
XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
|
|
#define XFS_INO_TO_OFFSET(mp,i) \
|
|
((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
|
|
#define XFS_INO_TO_FSB(mp,i) \
|
|
XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
|
|
#define XFS_AGINO_TO_INO(mp,a,i) \
|
|
(((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
|
|
#define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp))
|
|
#define XFS_AGINO_TO_OFFSET(mp,i) \
|
|
((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
|
|
#define XFS_OFFBNO_TO_AGINO(mp,b,o) \
|
|
((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
|
|
#define XFS_FSB_TO_INO(mp, b) ((xfs_ino_t)((b) << XFS_INO_OFFSET_BITS(mp)))
|
|
#define XFS_AGB_TO_AGINO(mp, b) ((xfs_agino_t)((b) << XFS_INO_OFFSET_BITS(mp)))
|
|
|
|
#define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL))
|
|
#define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL))
|
|
|
|
/*
|
|
* RealTime Device format definitions
|
|
*/
|
|
|
|
/* Min and max rt extent sizes, specified in bytes */
|
|
#define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
|
|
#define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */
|
|
#define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */
|
|
|
|
/*
|
|
* RT bit manipulation macros.
|
|
*/
|
|
#define XFS_RTBITMAP_MAGIC 0x424D505A /* BMPZ */
|
|
#define XFS_RTSUMMARY_MAGIC 0x53554D59 /* SUMY */
|
|
|
|
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 */
|
|
};
|
|
|
|
#define XFS_RTBUF_CRC_OFF \
|
|
offsetof(struct xfs_rtbuf_blkinfo, rt_crc)
|
|
|
|
/*
|
|
* Dquot and dquot block format definitions
|
|
*/
|
|
#define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */
|
|
#define XFS_DQUOT_VERSION (uint8_t)0x01 /* latest version number */
|
|
|
|
#define XFS_DQTYPE_USER (1u << 0) /* user dquot record */
|
|
#define XFS_DQTYPE_PROJ (1u << 1) /* project dquot record */
|
|
#define XFS_DQTYPE_GROUP (1u << 2) /* group dquot record */
|
|
#define XFS_DQTYPE_BIGTIME (1u << 7) /* large expiry timestamps */
|
|
|
|
/* bitmask to determine if this is a user/group/project dquot */
|
|
#define XFS_DQTYPE_REC_MASK (XFS_DQTYPE_USER | \
|
|
XFS_DQTYPE_PROJ | \
|
|
XFS_DQTYPE_GROUP)
|
|
|
|
#define XFS_DQTYPE_ANY (XFS_DQTYPE_REC_MASK | \
|
|
XFS_DQTYPE_BIGTIME)
|
|
|
|
/*
|
|
* XFS Quota Timers
|
|
* ================
|
|
*
|
|
* Traditional quota grace period expiration timers are an unsigned 32-bit
|
|
* seconds counter; time zero is the Unix epoch, Jan 1 00:00:01 UTC 1970.
|
|
* Note that an expiration value of zero means that the quota limit has not
|
|
* been reached, and therefore no expiration has been set. Therefore, the
|
|
* ondisk min and max defined here can be used directly to constrain the incore
|
|
* quota expiration timestamps on a Unix system.
|
|
*
|
|
* When bigtime is enabled, we trade two bits of precision to expand the
|
|
* expiration timeout range to match that of big inode timestamps. The min and
|
|
* max recorded here are the on-disk limits, not a Unix timestamp.
|
|
*
|
|
* The grace period for each quota type is stored in the root dquot (id = 0)
|
|
* and is applied to a non-root dquot when it exceeds the soft or hard limits.
|
|
* The length of quota grace periods are unsigned 32-bit quantities measured in
|
|
* units of seconds. A value of zero means to use the default period.
|
|
*/
|
|
|
|
/*
|
|
* Smallest possible ondisk quota expiration value with traditional timestamps.
|
|
* This corresponds exactly with the incore expiration Jan 1 00:00:01 UTC 1970.
|
|
*/
|
|
#define XFS_DQ_LEGACY_EXPIRY_MIN ((int64_t)1)
|
|
|
|
/*
|
|
* Largest possible ondisk quota expiration value with traditional timestamps.
|
|
* This corresponds exactly with the incore expiration Feb 7 06:28:15 UTC 2106.
|
|
*/
|
|
#define XFS_DQ_LEGACY_EXPIRY_MAX ((int64_t)U32_MAX)
|
|
|
|
/*
|
|
* Smallest possible ondisk quota expiration value with bigtime timestamps.
|
|
* This corresponds (after conversion to a Unix timestamp) with the incore
|
|
* expiration of Jan 1 00:00:04 UTC 1970.
|
|
*/
|
|
#define XFS_DQ_BIGTIME_EXPIRY_MIN (XFS_DQ_LEGACY_EXPIRY_MIN)
|
|
|
|
/*
|
|
* Largest supported ondisk quota expiration value with bigtime timestamps.
|
|
* This corresponds (after conversion to a Unix timestamp) with an incore
|
|
* expiration of Jul 2 20:20:24 UTC 2486.
|
|
*
|
|
* The ondisk field supports values up to -1U, which corresponds to an incore
|
|
* expiration in 2514. This is beyond the maximum the bigtime inode timestamp,
|
|
* so we cap the maximum bigtime quota expiration to the max inode timestamp.
|
|
*/
|
|
#define XFS_DQ_BIGTIME_EXPIRY_MAX ((int64_t)4074815106U)
|
|
|
|
/*
|
|
* The following conversion factors assist in converting a quota expiration
|
|
* timestamp between the incore and ondisk formats.
|
|
*/
|
|
#define XFS_DQ_BIGTIME_SHIFT (2)
|
|
#define XFS_DQ_BIGTIME_SLACK ((int64_t)(1ULL << XFS_DQ_BIGTIME_SHIFT) - 1)
|
|
|
|
/* Convert an incore quota expiration timestamp to an ondisk bigtime value. */
|
|
static inline uint32_t xfs_dq_unix_to_bigtime(time64_t unix_seconds)
|
|
{
|
|
/*
|
|
* Round the expiration timestamp up to the nearest bigtime timestamp
|
|
* that we can store, to give users the most time to fix problems.
|
|
*/
|
|
return ((uint64_t)unix_seconds + XFS_DQ_BIGTIME_SLACK) >>
|
|
XFS_DQ_BIGTIME_SHIFT;
|
|
}
|
|
|
|
/* Convert an ondisk bigtime quota expiration value to an incore timestamp. */
|
|
static inline time64_t xfs_dq_bigtime_to_unix(uint32_t ondisk_seconds)
|
|
{
|
|
return (time64_t)ondisk_seconds << XFS_DQ_BIGTIME_SHIFT;
|
|
}
|
|
|
|
/*
|
|
* Default quota grace periods, ranging from zero (use the compiled defaults)
|
|
* to ~136 years. These are applied to a non-root dquot that has exceeded
|
|
* either limit.
|
|
*/
|
|
#define XFS_DQ_GRACE_MIN ((int64_t)0)
|
|
#define XFS_DQ_GRACE_MAX ((int64_t)U32_MAX)
|
|
|
|
/* 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 */
|
|
};
|
|
|
|
#define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc)
|
|
|
|
/*
|
|
* This defines the unit of allocation of dquots.
|
|
*
|
|
* Currently, it is just one file system block, and a 4K blk contains 30
|
|
* (136 * 30 = 4080) dquots. It's probably not worth trying to make
|
|
* this more dynamic.
|
|
*
|
|
* However, if this number is changed, we have to make sure that we don't
|
|
* implicitly assume that we do allocations in chunks of a single filesystem
|
|
* block in the dquot/xqm code.
|
|
*
|
|
* This is part of the ondisk format because the structure size is not a power
|
|
* of two, which leaves slack at the end of the disk block.
|
|
*/
|
|
#define XFS_DQUOT_CLUSTER_SIZE_FSB (xfs_filblks_t)1
|
|
|
|
/*
|
|
* Remote symlink format and access functions.
|
|
*/
|
|
#define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */
|
|
|
|
struct xfs_dsymlink_hdr {
|
|
__be32 sl_magic;
|
|
__be32 sl_offset;
|
|
__be32 sl_bytes;
|
|
__be32 sl_crc;
|
|
uuid_t sl_uuid;
|
|
__be64 sl_owner;
|
|
__be64 sl_blkno;
|
|
__be64 sl_lsn;
|
|
};
|
|
|
|
#define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc)
|
|
|
|
#define XFS_SYMLINK_MAXLEN 1024
|
|
/*
|
|
* The maximum pathlen is 1024 bytes. Since the minimum file system
|
|
* blocksize is 512 bytes, we can get a max of 3 extents back from
|
|
* bmapi when crc headers are taken into account.
|
|
*/
|
|
#define XFS_SYMLINK_MAPS 3
|
|
|
|
#define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \
|
|
((bufsize) - (xfs_has_crc((mp)) ? \
|
|
sizeof(struct xfs_dsymlink_hdr) : 0))
|
|
|
|
|
|
/*
|
|
* Allocation Btree format definitions
|
|
*
|
|
* There are two on-disk btrees, one sorted by blockno and one sorted
|
|
* by blockcount and blockno. All blocks look the same to make the code
|
|
* simpler; if we have time later, we'll make the optimizations.
|
|
*/
|
|
#define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */
|
|
#define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */
|
|
#define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */
|
|
#define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */
|
|
|
|
/*
|
|
* Data record/key structure
|
|
*/
|
|
typedef struct xfs_alloc_rec {
|
|
__be32 ar_startblock; /* starting block number */
|
|
__be32 ar_blockcount; /* count of free blocks */
|
|
} xfs_alloc_rec_t, xfs_alloc_key_t;
|
|
|
|
typedef struct xfs_alloc_rec_incore {
|
|
xfs_agblock_t ar_startblock; /* starting block number */
|
|
xfs_extlen_t ar_blockcount; /* count of free blocks */
|
|
} xfs_alloc_rec_incore_t;
|
|
|
|
/* btree pointer type */
|
|
typedef __be32 xfs_alloc_ptr_t;
|
|
|
|
/*
|
|
* Block numbers in the AG:
|
|
* SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
|
|
*/
|
|
#define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
|
|
#define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
|
|
|
|
|
|
/*
|
|
* Inode Allocation Btree format definitions
|
|
*
|
|
* There is a btree for the inode map per allocation group.
|
|
*/
|
|
#define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
|
|
#define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */
|
|
#define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */
|
|
#define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */
|
|
|
|
typedef uint64_t xfs_inofree_t;
|
|
#define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
|
|
#define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
|
|
#define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
|
|
#define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
|
|
|
|
#define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */
|
|
#define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(uint16_t))
|
|
#define XFS_INODES_PER_HOLEMASK_BIT \
|
|
(XFS_INODES_PER_CHUNK / (NBBY * sizeof(uint16_t)))
|
|
|
|
static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
|
|
{
|
|
return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
|
|
}
|
|
|
|
/*
|
|
* The on-disk inode record structure has two formats. The original "full"
|
|
* format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount
|
|
* and replaces the 3 high-order freecount bytes wth the holemask and inode
|
|
* count.
|
|
*
|
|
* The holemask of the sparse record format allows an inode chunk to have holes
|
|
* that refer to blocks not owned by the inode record. This facilitates inode
|
|
* allocation in the event of severe free space fragmentation.
|
|
*/
|
|
typedef struct xfs_inobt_rec {
|
|
__be32 ir_startino; /* starting inode number */
|
|
union {
|
|
struct {
|
|
__be32 ir_freecount; /* count of free inodes */
|
|
} f;
|
|
struct {
|
|
__be16 ir_holemask;/* hole mask for sparse chunks */
|
|
__u8 ir_count; /* total inode count */
|
|
__u8 ir_freecount; /* count of free inodes */
|
|
} sp;
|
|
} ir_u;
|
|
__be64 ir_free; /* free inode mask */
|
|
} xfs_inobt_rec_t;
|
|
|
|
typedef struct xfs_inobt_rec_incore {
|
|
xfs_agino_t ir_startino; /* starting inode number */
|
|
uint16_t ir_holemask; /* hole mask for sparse chunks */
|
|
uint8_t ir_count; /* total inode count */
|
|
uint8_t ir_freecount; /* count of free inodes (set bits) */
|
|
xfs_inofree_t ir_free; /* free inode mask */
|
|
} xfs_inobt_rec_incore_t;
|
|
|
|
static inline bool xfs_inobt_issparse(uint16_t holemask)
|
|
{
|
|
/* non-zero holemask represents a sparse rec. */
|
|
return holemask;
|
|
}
|
|
|
|
/*
|
|
* Key structure
|
|
*/
|
|
typedef struct xfs_inobt_key {
|
|
__be32 ir_startino; /* starting inode number */
|
|
} xfs_inobt_key_t;
|
|
|
|
/* btree pointer type */
|
|
typedef __be32 xfs_inobt_ptr_t;
|
|
|
|
/*
|
|
* block numbers in the AG.
|
|
*/
|
|
#define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
|
|
#define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
|
|
|
|
/*
|
|
* Reverse mapping btree format definitions
|
|
*
|
|
* There is a btree for the reverse map per allocation group
|
|
*/
|
|
#define XFS_RMAP_CRC_MAGIC 0x524d4233 /* 'RMB3' */
|
|
|
|
/*
|
|
* Ownership info for an extent. This is used to create reverse-mapping
|
|
* entries.
|
|
*/
|
|
#define XFS_OWNER_INFO_ATTR_FORK (1 << 0)
|
|
#define XFS_OWNER_INFO_BMBT_BLOCK (1 << 1)
|
|
struct xfs_owner_info {
|
|
uint64_t oi_owner;
|
|
xfs_fileoff_t oi_offset;
|
|
unsigned int oi_flags;
|
|
};
|
|
|
|
/*
|
|
* Special owner types.
|
|
*
|
|
* Seeing as we only support up to 8EB, we have the upper bit of the owner field
|
|
* to tell us we have a special owner value. We use these for static metadata
|
|
* allocated at mkfs/growfs time, as well as for freespace management metadata.
|
|
*/
|
|
#define XFS_RMAP_OWN_NULL (-1ULL) /* No owner, for growfs */
|
|
#define XFS_RMAP_OWN_UNKNOWN (-2ULL) /* Unknown owner, for EFI recovery */
|
|
#define XFS_RMAP_OWN_FS (-3ULL) /* static fs metadata */
|
|
#define XFS_RMAP_OWN_LOG (-4ULL) /* static fs metadata */
|
|
#define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */
|
|
#define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */
|
|
#define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */
|
|
#define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */
|
|
#define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */
|
|
#define XFS_RMAP_OWN_MIN (-10ULL) /* guard */
|
|
|
|
#define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63)))
|
|
|
|
/*
|
|
* Data record structure
|
|
*/
|
|
struct xfs_rmap_rec {
|
|
__be32 rm_startblock; /* extent start block */
|
|
__be32 rm_blockcount; /* extent length */
|
|
__be64 rm_owner; /* extent owner */
|
|
__be64 rm_offset; /* offset within the owner */
|
|
};
|
|
|
|
/*
|
|
* rmap btree record
|
|
* rm_offset:63 is the attribute fork flag
|
|
* rm_offset:62 is the bmbt block flag
|
|
* rm_offset:61 is the unwritten extent flag (same as l0:63 in bmbt)
|
|
* rm_offset:54-60 aren't used and should be zero
|
|
* rm_offset:0-53 is the block offset within the inode
|
|
*/
|
|
#define XFS_RMAP_OFF_ATTR_FORK ((uint64_t)1ULL << 63)
|
|
#define XFS_RMAP_OFF_BMBT_BLOCK ((uint64_t)1ULL << 62)
|
|
#define XFS_RMAP_OFF_UNWRITTEN ((uint64_t)1ULL << 61)
|
|
|
|
#define XFS_RMAP_LEN_MAX ((uint32_t)~0U)
|
|
#define XFS_RMAP_OFF_FLAGS (XFS_RMAP_OFF_ATTR_FORK | \
|
|
XFS_RMAP_OFF_BMBT_BLOCK | \
|
|
XFS_RMAP_OFF_UNWRITTEN)
|
|
#define XFS_RMAP_OFF_MASK ((uint64_t)0x3FFFFFFFFFFFFFULL)
|
|
|
|
#define XFS_RMAP_OFF(off) ((off) & XFS_RMAP_OFF_MASK)
|
|
|
|
#define XFS_RMAP_IS_BMBT_BLOCK(off) (!!((off) & XFS_RMAP_OFF_BMBT_BLOCK))
|
|
#define XFS_RMAP_IS_ATTR_FORK(off) (!!((off) & XFS_RMAP_OFF_ATTR_FORK))
|
|
#define XFS_RMAP_IS_UNWRITTEN(len) (!!((off) & XFS_RMAP_OFF_UNWRITTEN))
|
|
|
|
#define RMAPBT_STARTBLOCK_BITLEN 32
|
|
#define RMAPBT_BLOCKCOUNT_BITLEN 32
|
|
#define RMAPBT_OWNER_BITLEN 64
|
|
#define RMAPBT_ATTRFLAG_BITLEN 1
|
|
#define RMAPBT_BMBTFLAG_BITLEN 1
|
|
#define RMAPBT_EXNTFLAG_BITLEN 1
|
|
#define RMAPBT_UNUSED_OFFSET_BITLEN 7
|
|
#define RMAPBT_OFFSET_BITLEN 54
|
|
|
|
/*
|
|
* Key structure
|
|
*
|
|
* We don't use the length for lookups
|
|
*/
|
|
struct xfs_rmap_key {
|
|
__be32 rm_startblock; /* extent start block */
|
|
__be64 rm_owner; /* extent owner */
|
|
__be64 rm_offset; /* offset within the owner */
|
|
} __attribute__((packed));
|
|
|
|
/* btree pointer type */
|
|
typedef __be32 xfs_rmap_ptr_t;
|
|
|
|
#define XFS_RMAP_BLOCK(mp) \
|
|
(xfs_has_finobt(((mp))) ? \
|
|
XFS_FIBT_BLOCK(mp) + 1 : \
|
|
XFS_IBT_BLOCK(mp) + 1)
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* Reference Count Btree format definitions
|
|
*
|
|
*/
|
|
#define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */
|
|
|
|
unsigned int xfs_refc_block(struct xfs_mount *mp);
|
|
|
|
/*
|
|
* Data record/key structure
|
|
*
|
|
* Each record associates a range of physical blocks (starting at
|
|
* rc_startblock and ending rc_blockcount blocks later) with a reference
|
|
* count (rc_refcount). Extents that are being used to stage a copy on
|
|
* write (CoW) operation are recorded in the refcount btree with a
|
|
* refcount of 1. All other records must have a refcount > 1 and must
|
|
* track an extent mapped only by file data forks.
|
|
*
|
|
* Extents with a single owner (attributes, metadata, non-shared file
|
|
* data) are not tracked here. Free space is also not tracked here.
|
|
* This is consistent with pre-reflink XFS.
|
|
*/
|
|
|
|
/*
|
|
* Extents that are being used to stage a copy on write are stored
|
|
* in the refcount btree with a refcount of 1 and the upper bit set
|
|
* on the startblock. This speeds up mount time deletion of stale
|
|
* staging extents because they're all at the right side of the tree.
|
|
*/
|
|
#define XFS_REFC_COWFLAG (1U << 31)
|
|
#define REFCNTBT_COWFLAG_BITLEN 1
|
|
#define REFCNTBT_AGBLOCK_BITLEN 31
|
|
|
|
struct xfs_refcount_rec {
|
|
__be32 rc_startblock; /* starting block number */
|
|
__be32 rc_blockcount; /* count of blocks */
|
|
__be32 rc_refcount; /* number of inodes linked here */
|
|
};
|
|
|
|
struct xfs_refcount_key {
|
|
__be32 rc_startblock; /* starting block number */
|
|
};
|
|
|
|
#define XFS_REFC_REFCOUNT_MAX ((xfs_nlink_t)~0U)
|
|
#define XFS_REFC_LEN_MAX ((xfs_extlen_t)~0U)
|
|
|
|
/* 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.
|
|
*/
|
|
typedef struct xfs_bmdr_block {
|
|
__be16 bb_level; /* 0 is a leaf */
|
|
__be16 bb_numrecs; /* current # of data records */
|
|
} xfs_bmdr_block_t;
|
|
|
|
/*
|
|
* Bmap btree record and extent descriptor.
|
|
* l0:63 is an extent flag (value 1 indicates non-normal).
|
|
* l0:9-62 are startoff.
|
|
* l0:0-8 and l1:21-63 are startblock.
|
|
* l1:0-20 are blockcount.
|
|
*/
|
|
#define BMBT_EXNTFLAG_BITLEN 1
|
|
#define BMBT_STARTOFF_BITLEN 54
|
|
#define BMBT_STARTBLOCK_BITLEN 52
|
|
#define BMBT_BLOCKCOUNT_BITLEN 21
|
|
|
|
#define BMBT_STARTOFF_MASK ((1ULL << BMBT_STARTOFF_BITLEN) - 1)
|
|
#define BMBT_BLOCKCOUNT_MASK ((1ULL << BMBT_BLOCKCOUNT_BITLEN) - 1)
|
|
|
|
#define XFS_MAX_BMBT_EXTLEN ((xfs_extlen_t)(BMBT_BLOCKCOUNT_MASK))
|
|
|
|
/*
|
|
* bmbt records have a file offset (block) field that is 54 bits wide, so this
|
|
* is the largest xfs_fileoff_t that we ever expect to see.
|
|
*/
|
|
#define XFS_MAX_FILEOFF (BMBT_STARTOFF_MASK + BMBT_BLOCKCOUNT_MASK)
|
|
|
|
typedef struct xfs_bmbt_rec {
|
|
__be64 l0, l1;
|
|
} xfs_bmbt_rec_t;
|
|
|
|
typedef uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
|
|
typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
|
|
|
|
/*
|
|
* Values and macros for delayed-allocation startblock fields.
|
|
*/
|
|
#define STARTBLOCKVALBITS 17
|
|
#define STARTBLOCKMASKBITS (15 + 20)
|
|
#define STARTBLOCKMASK \
|
|
(((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
|
|
|
|
static inline int isnullstartblock(xfs_fsblock_t x)
|
|
{
|
|
return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
|
|
}
|
|
|
|
static inline xfs_fsblock_t nullstartblock(int k)
|
|
{
|
|
ASSERT(k < (1 << STARTBLOCKVALBITS));
|
|
return STARTBLOCKMASK | (k);
|
|
}
|
|
|
|
static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
|
|
{
|
|
return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
|
|
}
|
|
|
|
/*
|
|
* Key structure for non-leaf levels of the tree.
|
|
*/
|
|
typedef struct xfs_bmbt_key {
|
|
__be64 br_startoff; /* starting file offset */
|
|
} xfs_bmbt_key_t, xfs_bmdr_key_t;
|
|
|
|
/* btree pointer type */
|
|
typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
|
|
|
|
|
|
/*
|
|
* Generic Btree block format definitions
|
|
*
|
|
* This is a combination of the actual format used on disk for short and long
|
|
* format btrees. The first three fields are shared by both format, but the
|
|
* pointers are different and should be used with care.
|
|
*
|
|
* To get the size of the actual short or long form headers please use the size
|
|
* macros below. Never use sizeof(xfs_btree_block).
|
|
*
|
|
* The blkno, crc, lsn, owner and uuid fields are only available in filesystems
|
|
* with the crc feature bit, and all accesses to them must be conditional on
|
|
* that flag.
|
|
*/
|
|
/* short form block header */
|
|
struct xfs_btree_block_shdr {
|
|
__be32 bb_leftsib;
|
|
__be32 bb_rightsib;
|
|
|
|
__be64 bb_blkno;
|
|
__be64 bb_lsn;
|
|
uuid_t bb_uuid;
|
|
__be32 bb_owner;
|
|
__le32 bb_crc;
|
|
};
|
|
|
|
/* long form block header */
|
|
struct xfs_btree_block_lhdr {
|
|
__be64 bb_leftsib;
|
|
__be64 bb_rightsib;
|
|
|
|
__be64 bb_blkno;
|
|
__be64 bb_lsn;
|
|
uuid_t bb_uuid;
|
|
__be64 bb_owner;
|
|
__le32 bb_crc;
|
|
__be32 bb_pad; /* padding for alignment */
|
|
};
|
|
|
|
struct xfs_btree_block {
|
|
__be32 bb_magic; /* magic number for block type */
|
|
__be16 bb_level; /* 0 is a leaf */
|
|
__be16 bb_numrecs; /* current # of data records */
|
|
union {
|
|
struct xfs_btree_block_shdr s;
|
|
struct xfs_btree_block_lhdr l;
|
|
} bb_u; /* rest */
|
|
};
|
|
|
|
/* size of a short form block */
|
|
#define XFS_BTREE_SBLOCK_LEN \
|
|
(offsetof(struct xfs_btree_block, bb_u) + \
|
|
offsetof(struct xfs_btree_block_shdr, bb_blkno))
|
|
/* size of a long form block */
|
|
#define XFS_BTREE_LBLOCK_LEN \
|
|
(offsetof(struct xfs_btree_block, bb_u) + \
|
|
offsetof(struct xfs_btree_block_lhdr, bb_blkno))
|
|
|
|
/* sizes of CRC enabled btree blocks */
|
|
#define XFS_BTREE_SBLOCK_CRC_LEN \
|
|
(offsetof(struct xfs_btree_block, bb_u) + \
|
|
sizeof(struct xfs_btree_block_shdr))
|
|
#define XFS_BTREE_LBLOCK_CRC_LEN \
|
|
(offsetof(struct xfs_btree_block, bb_u) + \
|
|
sizeof(struct xfs_btree_block_lhdr))
|
|
|
|
#define XFS_BTREE_SBLOCK_CRC_OFF \
|
|
offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
|
|
#define XFS_BTREE_LBLOCK_CRC_OFF \
|
|
offsetof(struct xfs_btree_block, bb_u.l.bb_crc)
|
|
|
|
/*
|
|
* On-disk XFS access control list structure.
|
|
*/
|
|
struct xfs_acl_entry {
|
|
__be32 ae_tag;
|
|
__be32 ae_id;
|
|
__be16 ae_perm;
|
|
__be16 ae_pad; /* fill the implicit hole in the structure */
|
|
};
|
|
|
|
struct xfs_acl {
|
|
__be32 acl_cnt;
|
|
struct xfs_acl_entry acl_entry[];
|
|
};
|
|
|
|
/*
|
|
* The number of ACL entries allowed is defined by the on-disk format.
|
|
* For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
|
|
* limited only by the maximum size of the xattr that stores the information.
|
|
*/
|
|
#define XFS_ACL_MAX_ENTRIES(mp) \
|
|
(xfs_has_crc(mp) \
|
|
? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
|
|
sizeof(struct xfs_acl_entry) \
|
|
: 25)
|
|
|
|
#define XFS_ACL_SIZE(cnt) \
|
|
(sizeof(struct xfs_acl) + \
|
|
sizeof(struct xfs_acl_entry) * cnt)
|
|
|
|
#define XFS_ACL_MAX_SIZE(mp) \
|
|
XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp)))
|
|
|
|
|
|
/* On-disk XFS extended attribute names */
|
|
#define SGI_ACL_FILE "SGI_ACL_FILE"
|
|
#define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT"
|
|
#define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1)
|
|
#define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1)
|
|
|
|
#endif /* __XFS_FORMAT_H__ */
|