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_agi_buf_ops; 26 extern const struct xfs_buf_ops xfs_agf_buf_ops; 27 extern const struct xfs_buf_ops xfs_agfl_buf_ops; 28 extern const struct xfs_buf_ops xfs_allocbt_buf_ops; 29 extern const struct xfs_buf_ops xfs_rmapbt_buf_ops; 30 extern const struct xfs_buf_ops xfs_refcountbt_buf_ops; 31 extern const struct xfs_buf_ops xfs_attr3_leaf_buf_ops; 32 extern const struct xfs_buf_ops xfs_attr3_rmt_buf_ops; 33 extern const struct xfs_buf_ops xfs_bmbt_buf_ops; 34 extern const struct xfs_buf_ops xfs_da3_node_buf_ops; 35 extern const struct xfs_buf_ops xfs_dquot_buf_ops; 36 extern const struct xfs_buf_ops xfs_symlink_buf_ops; 37 extern const struct xfs_buf_ops xfs_agi_buf_ops; 38 extern const struct xfs_buf_ops xfs_inobt_buf_ops; 39 extern const struct xfs_buf_ops xfs_inode_buf_ops; 40 extern const struct xfs_buf_ops xfs_inode_buf_ra_ops; 41 extern const struct xfs_buf_ops xfs_dquot_buf_ops; 42 extern const struct xfs_buf_ops xfs_dquot_buf_ra_ops; 43 extern const struct xfs_buf_ops xfs_sb_buf_ops; 44 extern const struct xfs_buf_ops xfs_sb_quiet_buf_ops; 45 extern const struct xfs_buf_ops xfs_symlink_buf_ops; 46 extern const struct xfs_buf_ops xfs_rtbuf_ops; 47 48 /* log size calculation functions */ 49 int xfs_log_calc_unit_res(struct xfs_mount *mp, int unit_bytes); 50 int xfs_log_calc_minimum_size(struct xfs_mount *); 51 52 struct xfs_trans_res; 53 void xfs_log_get_max_trans_res(struct xfs_mount *mp, 54 struct xfs_trans_res *max_resp); 55 56 /* 57 * Values for t_flags. 58 */ 59 #define XFS_TRANS_DIRTY 0x01 /* something needs to be logged */ 60 #define XFS_TRANS_SB_DIRTY 0x02 /* superblock is modified */ 61 #define XFS_TRANS_PERM_LOG_RES 0x04 /* xact took a permanent log res */ 62 #define XFS_TRANS_SYNC 0x08 /* make commit synchronous */ 63 #define XFS_TRANS_DQ_DIRTY 0x10 /* at least one dquot in trx dirty */ 64 #define XFS_TRANS_RESERVE 0x20 /* OK to use reserved data blocks */ 65 #define XFS_TRANS_NO_WRITECOUNT 0x40 /* do not elevate SB writecount */ 66 #define XFS_TRANS_NOFS 0x80 /* pass KM_NOFS to kmem_alloc */ 67 /* 68 * LOWMODE is used by the allocator to activate the lowspace algorithm - when 69 * free space is running low the extent allocator may choose to allocate an 70 * extent from an AG without leaving sufficient space for a btree split when 71 * inserting the new extent. In this case the allocator will enable the 72 * lowspace algorithm which is supposed to allow further allocations (such as 73 * btree splits and newroots) to allocate from sequential AGs. In order to 74 * avoid locking AGs out of order the lowspace algorithm will start searching 75 * for free space from AG 0. If the correct transaction reservations have been 76 * made then this algorithm will eventually find all the space it needs. 77 */ 78 #define XFS_TRANS_LOWMODE 0x100 /* allocate in low space mode */ 79 80 /* 81 * Field values for xfs_trans_mod_sb. 82 */ 83 #define XFS_TRANS_SB_ICOUNT 0x00000001 84 #define XFS_TRANS_SB_IFREE 0x00000002 85 #define XFS_TRANS_SB_FDBLOCKS 0x00000004 86 #define XFS_TRANS_SB_RES_FDBLOCKS 0x00000008 87 #define XFS_TRANS_SB_FREXTENTS 0x00000010 88 #define XFS_TRANS_SB_RES_FREXTENTS 0x00000020 89 #define XFS_TRANS_SB_DBLOCKS 0x00000040 90 #define XFS_TRANS_SB_AGCOUNT 0x00000080 91 #define XFS_TRANS_SB_IMAXPCT 0x00000100 92 #define XFS_TRANS_SB_REXTSIZE 0x00000200 93 #define XFS_TRANS_SB_RBMBLOCKS 0x00000400 94 #define XFS_TRANS_SB_RBLOCKS 0x00000800 95 #define XFS_TRANS_SB_REXTENTS 0x00001000 96 #define XFS_TRANS_SB_REXTSLOG 0x00002000 97 98 /* 99 * Here we centralize the specification of XFS meta-data buffer reference count 100 * values. This determines how hard the buffer cache tries to hold onto the 101 * buffer. 102 */ 103 #define XFS_AGF_REF 4 104 #define XFS_AGI_REF 4 105 #define XFS_AGFL_REF 3 106 #define XFS_INO_BTREE_REF 3 107 #define XFS_ALLOC_BTREE_REF 2 108 #define XFS_BMAP_BTREE_REF 2 109 #define XFS_RMAP_BTREE_REF 2 110 #define XFS_DIR_BTREE_REF 2 111 #define XFS_INO_REF 2 112 #define XFS_ATTR_BTREE_REF 1 113 #define XFS_DQUOT_REF 1 114 #define XFS_REFC_BTREE_REF 1 115 #define XFS_SSB_REF 0 116 117 /* 118 * Flags for xfs_trans_ichgtime(). 119 */ 120 #define XFS_ICHGTIME_MOD 0x1 /* data fork modification timestamp */ 121 #define XFS_ICHGTIME_CHG 0x2 /* inode field change timestamp */ 122 #define XFS_ICHGTIME_CREATE 0x4 /* inode create timestamp */ 123 124 125 /* 126 * Symlink decoding/encoding functions 127 */ 128 int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen); 129 int xfs_symlink_hdr_set(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset, 130 uint32_t size, struct xfs_buf *bp); 131 bool xfs_symlink_hdr_ok(xfs_ino_t ino, uint32_t offset, 132 uint32_t size, struct xfs_buf *bp); 133 void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp, 134 struct xfs_inode *ip, struct xfs_ifork *ifp); 135 xfs_failaddr_t xfs_symlink_shortform_verify(struct xfs_inode *ip); 136 137 #endif /* __XFS_SHARED_H__ */ 138