1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 4 * Copyright (c) 2013 Red Hat, Inc. 5 * All Rights Reserved. 6 */ 7#ifndef __XFS_SHARED_H__ 8#define __XFS_SHARED_H__ 9 10/* 11 * Definitions shared between kernel and userspace that don't fit into any other 12 * header file that is shared with userspace. 13 */ 14struct xfs_ifork; 15struct xfs_buf; 16struct xfs_buf_ops; 17struct xfs_mount; 18struct xfs_trans; 19struct xfs_inode; 20 21/* 22 * Buffer verifier operations are widely used, including userspace tools 23 */ 24extern const struct xfs_buf_ops xfs_agf_buf_ops; 25extern const struct xfs_buf_ops xfs_agi_buf_ops; 26extern const struct xfs_buf_ops xfs_agf_buf_ops; 27extern const struct xfs_buf_ops xfs_agfl_buf_ops; 28extern const struct xfs_buf_ops xfs_bnobt_buf_ops; 29extern const struct xfs_buf_ops xfs_cntbt_buf_ops; 30extern const struct xfs_buf_ops xfs_rmapbt_buf_ops; 31extern const struct xfs_buf_ops xfs_refcountbt_buf_ops; 32extern const struct xfs_buf_ops xfs_attr3_leaf_buf_ops; 33extern const struct xfs_buf_ops xfs_attr3_rmt_buf_ops; 34extern const struct xfs_buf_ops xfs_bmbt_buf_ops; 35extern const struct xfs_buf_ops xfs_da3_node_buf_ops; 36extern const struct xfs_buf_ops xfs_dquot_buf_ops; 37extern const struct xfs_buf_ops xfs_symlink_buf_ops; 38extern const struct xfs_buf_ops xfs_agi_buf_ops; 39extern const struct xfs_buf_ops xfs_inobt_buf_ops; 40extern const struct xfs_buf_ops xfs_finobt_buf_ops; 41extern const struct xfs_buf_ops xfs_inode_buf_ops; 42extern const struct xfs_buf_ops xfs_inode_buf_ra_ops; 43extern const struct xfs_buf_ops xfs_dquot_buf_ops; 44extern const struct xfs_buf_ops xfs_dquot_buf_ra_ops; 45extern const struct xfs_buf_ops xfs_sb_buf_ops; 46extern const struct xfs_buf_ops xfs_sb_quiet_buf_ops; 47extern const struct xfs_buf_ops xfs_symlink_buf_ops; 48extern const struct xfs_buf_ops xfs_rtbuf_ops; 49 50/* log size calculation functions */ 51int xfs_log_calc_unit_res(struct xfs_mount *mp, int unit_bytes); 52int xfs_log_calc_minimum_size(struct xfs_mount *); 53 54struct xfs_trans_res; 55void xfs_log_get_max_trans_res(struct xfs_mount *mp, 56 struct xfs_trans_res *max_resp); 57 58/* 59 * Values for t_flags. 60 */ 61#define XFS_TRANS_DIRTY 0x01 /* something needs to be logged */ 62#define XFS_TRANS_SB_DIRTY 0x02 /* superblock is modified */ 63#define XFS_TRANS_PERM_LOG_RES 0x04 /* xact took a permanent log res */ 64#define XFS_TRANS_SYNC 0x08 /* make commit synchronous */ 65#define XFS_TRANS_DQ_DIRTY 0x10 /* at least one dquot in trx dirty */ 66#define XFS_TRANS_RESERVE 0x20 /* OK to use reserved data blocks */ 67#define XFS_TRANS_NO_WRITECOUNT 0x40 /* do not elevate SB writecount */ 68#define XFS_TRANS_RES_FDBLKS 0x80 /* reserve newly freed blocks */ 69/* 70 * LOWMODE is used by the allocator to activate the lowspace algorithm - when 71 * free space is running low the extent allocator may choose to allocate an 72 * extent from an AG without leaving sufficient space for a btree split when 73 * inserting the new extent. In this case the allocator will enable the 74 * lowspace algorithm which is supposed to allow further allocations (such as 75 * btree splits and newroots) to allocate from sequential AGs. In order to 76 * avoid locking AGs out of order the lowspace algorithm will start searching 77 * for free space from AG 0. If the correct transaction reservations have been 78 * made then this algorithm will eventually find all the space it needs. 79 */ 80#define XFS_TRANS_LOWMODE 0x100 /* allocate in low space mode */ 81 82/* 83 * Field values for xfs_trans_mod_sb. 84 */ 85#define XFS_TRANS_SB_ICOUNT 0x00000001 86#define XFS_TRANS_SB_IFREE 0x00000002 87#define XFS_TRANS_SB_FDBLOCKS 0x00000004 88#define XFS_TRANS_SB_RES_FDBLOCKS 0x00000008 89#define XFS_TRANS_SB_FREXTENTS 0x00000010 90#define XFS_TRANS_SB_RES_FREXTENTS 0x00000020 91#define XFS_TRANS_SB_DBLOCKS 0x00000040 92#define XFS_TRANS_SB_AGCOUNT 0x00000080 93#define XFS_TRANS_SB_IMAXPCT 0x00000100 94#define XFS_TRANS_SB_REXTSIZE 0x00000200 95#define XFS_TRANS_SB_RBMBLOCKS 0x00000400 96#define XFS_TRANS_SB_RBLOCKS 0x00000800 97#define XFS_TRANS_SB_REXTENTS 0x00001000 98#define XFS_TRANS_SB_REXTSLOG 0x00002000 99 100/* 101 * Here we centralize the specification of XFS meta-data buffer reference count 102 * values. This determines how hard the buffer cache tries to hold onto the 103 * buffer. 104 */ 105#define XFS_AGF_REF 4 106#define XFS_AGI_REF 4 107#define XFS_AGFL_REF 3 108#define XFS_INO_BTREE_REF 3 109#define XFS_ALLOC_BTREE_REF 2 110#define XFS_BMAP_BTREE_REF 2 111#define XFS_RMAP_BTREE_REF 2 112#define XFS_DIR_BTREE_REF 2 113#define XFS_INO_REF 2 114#define XFS_ATTR_BTREE_REF 1 115#define XFS_DQUOT_REF 1 116#define XFS_REFC_BTREE_REF 1 117#define XFS_SSB_REF 0 118 119/* 120 * Flags for xfs_trans_ichgtime(). 121 */ 122#define XFS_ICHGTIME_MOD 0x1 /* data fork modification timestamp */ 123#define XFS_ICHGTIME_CHG 0x2 /* inode field change timestamp */ 124#define XFS_ICHGTIME_CREATE 0x4 /* inode create timestamp */ 125 126 127/* 128 * Symlink decoding/encoding functions 129 */ 130int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen); 131int xfs_symlink_hdr_set(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset, 132 uint32_t size, struct xfs_buf *bp); 133bool xfs_symlink_hdr_ok(xfs_ino_t ino, uint32_t offset, 134 uint32_t size, struct xfs_buf *bp); 135void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp, 136 struct xfs_inode *ip, struct xfs_ifork *ifp); 137xfs_failaddr_t xfs_symlink_shortform_verify(struct xfs_inode *ip); 138 139/* Computed inode geometry for the filesystem. */ 140struct xfs_ino_geometry { 141 /* Maximum inode count in this filesystem. */ 142 uint64_t maxicount; 143 144 /* Actual inode cluster buffer size, in bytes. */ 145 unsigned int inode_cluster_size; 146 147 /* 148 * Desired inode cluster buffer size, in bytes. This value is not 149 * rounded up to at least one filesystem block, which is necessary for 150 * the sole purpose of validating sb_spino_align. Runtime code must 151 * only ever use inode_cluster_size. 152 */ 153 unsigned int inode_cluster_size_raw; 154 155 /* Inode cluster sizes, adjusted to be at least 1 fsb. */ 156 unsigned int inodes_per_cluster; 157 unsigned int blocks_per_cluster; 158 159 /* Inode cluster alignment. */ 160 unsigned int cluster_align; 161 unsigned int cluster_align_inodes; 162 unsigned int inoalign_mask; /* mask sb_inoalignmt if used */ 163 164 unsigned int inobt_mxr[2]; /* max inobt btree records */ 165 unsigned int inobt_mnr[2]; /* min inobt btree records */ 166 unsigned int inobt_maxlevels; /* max inobt btree levels. */ 167 168 /* Size of inode allocations under normal operation. */ 169 unsigned int ialloc_inos; 170 unsigned int ialloc_blks; 171 172 /* Minimum inode blocks for a sparse allocation. */ 173 unsigned int ialloc_min_blks; 174 175 /* stripe unit inode alignment */ 176 unsigned int ialloc_align; 177 178 unsigned int agino_log; /* #bits for agino in inum */ 179 180 /* precomputed value for di_flags2 */ 181 uint64_t new_diflags2; 182}; 183 184#endif /* __XFS_SHARED_H__ */ 185