138 lines
5.1 KiB
C
138 lines
5.1 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_agi_buf_ops;
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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_allocbt_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_refcountbt_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_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_symlink_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_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_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_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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extern const struct xfs_buf_ops xfs_rtbuf_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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#define XFS_TRANS_DIRTY 0x01 /* something needs to be logged */
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#define XFS_TRANS_SB_DIRTY 0x02 /* superblock is modified */
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#define XFS_TRANS_PERM_LOG_RES 0x04 /* xact took a permanent log res */
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#define XFS_TRANS_SYNC 0x08 /* make commit synchronous */
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#define XFS_TRANS_DQ_DIRTY 0x10 /* at least one dquot in trx dirty */
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#define XFS_TRANS_RESERVE 0x20 /* OK to use reserved data blocks */
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#define XFS_TRANS_NO_WRITECOUNT 0x40 /* do not elevate SB writecount */
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#define XFS_TRANS_NOFS 0x80 /* pass KM_NOFS to kmem_alloc */
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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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#endif /* __XFS_SHARED_H__ */
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