194 lines
6.6 KiB
C
194 lines
6.6 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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* Copyright (c) 2013 Red Hat, Inc.
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* All Rights Reserved.
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*/
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#ifndef __XFS_SHARED_H__
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#define __XFS_SHARED_H__
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/*
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* Definitions shared between kernel and userspace that don't fit into any other
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* header file that is shared with userspace.
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*/
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struct xfs_ifork;
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struct xfs_buf;
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struct xfs_buf_ops;
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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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/*
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* Buffer verifier operations are widely used, including userspace tools
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*/
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extern const struct xfs_buf_ops xfs_agf_buf_ops;
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extern const struct xfs_buf_ops xfs_agfl_buf_ops;
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extern const struct xfs_buf_ops xfs_agi_buf_ops;
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extern const struct xfs_buf_ops xfs_attr3_leaf_buf_ops;
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extern const struct xfs_buf_ops xfs_attr3_rmt_buf_ops;
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extern const struct xfs_buf_ops xfs_bmbt_buf_ops;
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extern const struct xfs_buf_ops xfs_bnobt_buf_ops;
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extern const struct xfs_buf_ops xfs_cntbt_buf_ops;
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extern const struct xfs_buf_ops xfs_da3_node_buf_ops;
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extern const struct xfs_buf_ops xfs_dquot_buf_ops;
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extern const struct xfs_buf_ops xfs_dquot_buf_ra_ops;
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extern const struct xfs_buf_ops xfs_finobt_buf_ops;
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extern const struct xfs_buf_ops xfs_inobt_buf_ops;
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extern const struct xfs_buf_ops xfs_inode_buf_ops;
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extern const struct xfs_buf_ops xfs_inode_buf_ra_ops;
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extern const struct xfs_buf_ops xfs_refcountbt_buf_ops;
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extern const struct xfs_buf_ops xfs_rmapbt_buf_ops;
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extern const struct xfs_buf_ops xfs_rtbuf_ops;
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extern const struct xfs_buf_ops xfs_sb_buf_ops;
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extern const struct xfs_buf_ops xfs_sb_quiet_buf_ops;
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extern const struct xfs_buf_ops xfs_symlink_buf_ops;
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/* log size calculation functions */
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int xfs_log_calc_unit_res(struct xfs_mount *mp, int unit_bytes);
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int xfs_log_calc_minimum_size(struct xfs_mount *);
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struct xfs_trans_res;
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void xfs_log_get_max_trans_res(struct xfs_mount *mp,
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struct xfs_trans_res *max_resp);
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/*
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* Values for t_flags.
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*/
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/* Transaction needs to be logged */
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#define XFS_TRANS_DIRTY (1u << 0)
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/* Superblock is dirty and needs to be logged */
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#define XFS_TRANS_SB_DIRTY (1u << 1)
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/* Transaction took a permanent log reservation */
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#define XFS_TRANS_PERM_LOG_RES (1u << 2)
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/* Synchronous transaction commit needed */
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#define XFS_TRANS_SYNC (1u << 3)
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/* Transaction can use reserve block pool */
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#define XFS_TRANS_RESERVE (1u << 4)
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/* Transaction should avoid VFS level superblock write accounting */
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#define XFS_TRANS_NO_WRITECOUNT (1u << 5)
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/* Transaction has freed blocks returned to it's reservation */
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#define XFS_TRANS_RES_FDBLKS (1u << 6)
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/* Transaction contains an intent done log item */
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#define XFS_TRANS_HAS_INTENT_DONE (1u << 7)
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/*
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* LOWMODE is used by the allocator to activate the lowspace algorithm - when
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* free space is running low the extent allocator may choose to allocate an
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* extent from an AG without leaving sufficient space for a btree split when
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* inserting the new extent. In this case the allocator will enable the
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* lowspace algorithm which is supposed to allow further allocations (such as
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* btree splits and newroots) to allocate from sequential AGs. In order to
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* avoid locking AGs out of order the lowspace algorithm will start searching
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* for free space from AG 0. If the correct transaction reservations have been
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* made then this algorithm will eventually find all the space it needs.
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*/
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#define XFS_TRANS_LOWMODE 0x100 /* allocate in low space mode */
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/*
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* Field values for xfs_trans_mod_sb.
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*/
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#define XFS_TRANS_SB_ICOUNT 0x00000001
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#define XFS_TRANS_SB_IFREE 0x00000002
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#define XFS_TRANS_SB_FDBLOCKS 0x00000004
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#define XFS_TRANS_SB_RES_FDBLOCKS 0x00000008
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#define XFS_TRANS_SB_FREXTENTS 0x00000010
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#define XFS_TRANS_SB_RES_FREXTENTS 0x00000020
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#define XFS_TRANS_SB_DBLOCKS 0x00000040
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#define XFS_TRANS_SB_AGCOUNT 0x00000080
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#define XFS_TRANS_SB_IMAXPCT 0x00000100
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#define XFS_TRANS_SB_REXTSIZE 0x00000200
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#define XFS_TRANS_SB_RBMBLOCKS 0x00000400
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#define XFS_TRANS_SB_RBLOCKS 0x00000800
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#define XFS_TRANS_SB_REXTENTS 0x00001000
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#define XFS_TRANS_SB_REXTSLOG 0x00002000
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/*
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* Here we centralize the specification of XFS meta-data buffer reference count
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* values. This determines how hard the buffer cache tries to hold onto the
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* buffer.
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*/
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#define XFS_AGF_REF 4
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#define XFS_AGI_REF 4
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#define XFS_AGFL_REF 3
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#define XFS_INO_BTREE_REF 3
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#define XFS_ALLOC_BTREE_REF 2
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#define XFS_BMAP_BTREE_REF 2
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#define XFS_RMAP_BTREE_REF 2
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#define XFS_DIR_BTREE_REF 2
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#define XFS_INO_REF 2
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#define XFS_ATTR_BTREE_REF 1
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#define XFS_DQUOT_REF 1
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#define XFS_REFC_BTREE_REF 1
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#define XFS_SSB_REF 0
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/*
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* Flags for xfs_trans_ichgtime().
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*/
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#define XFS_ICHGTIME_MOD 0x1 /* data fork modification timestamp */
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#define XFS_ICHGTIME_CHG 0x2 /* inode field change timestamp */
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#define XFS_ICHGTIME_CREATE 0x4 /* inode create timestamp */
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/*
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* Symlink decoding/encoding functions
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*/
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int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen);
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int xfs_symlink_hdr_set(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset,
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uint32_t size, struct xfs_buf *bp);
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bool xfs_symlink_hdr_ok(xfs_ino_t ino, uint32_t offset,
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uint32_t size, struct xfs_buf *bp);
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void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp,
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struct xfs_inode *ip, struct xfs_ifork *ifp);
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xfs_failaddr_t xfs_symlink_shortform_verify(struct xfs_inode *ip);
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/* Computed inode geometry for the filesystem. */
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struct xfs_ino_geometry {
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/* Maximum inode count in this filesystem. */
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uint64_t maxicount;
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/* Actual inode cluster buffer size, in bytes. */
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unsigned int inode_cluster_size;
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/*
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* Desired inode cluster buffer size, in bytes. This value is not
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* rounded up to at least one filesystem block, which is necessary for
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* the sole purpose of validating sb_spino_align. Runtime code must
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* only ever use inode_cluster_size.
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*/
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unsigned int inode_cluster_size_raw;
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/* Inode cluster sizes, adjusted to be at least 1 fsb. */
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unsigned int inodes_per_cluster;
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unsigned int blocks_per_cluster;
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/* Inode cluster alignment. */
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unsigned int cluster_align;
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unsigned int cluster_align_inodes;
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unsigned int inoalign_mask; /* mask sb_inoalignmt if used */
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unsigned int inobt_mxr[2]; /* max inobt btree records */
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unsigned int inobt_mnr[2]; /* min inobt btree records */
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unsigned int inobt_maxlevels; /* max inobt btree levels. */
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/* Size of inode allocations under normal operation. */
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unsigned int ialloc_inos;
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unsigned int ialloc_blks;
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/* Minimum inode blocks for a sparse allocation. */
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unsigned int ialloc_min_blks;
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/* stripe unit inode alignment */
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unsigned int ialloc_align;
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unsigned int agino_log; /* #bits for agino in inum */
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/* precomputed default inode attribute fork offset */
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unsigned int attr_fork_offset;
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/* precomputed value for di_flags2 */
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uint64_t new_diflags2;
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};
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#endif /* __XFS_SHARED_H__ */
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