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