root/fs/xfs/libxfs/xfs_shared.h

INCLUDED FROM

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