libxfs/xfs_shared.h

   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 /* Faked up kernel bits */
 184 struct rb_root {
 185 };
 186
 187 #define RB_ROOT                 (struct rb_root) { }
 188
 189 typedef struct wait_queue_head {
 190 } wait_queue_head_t;
 191
 192 #define init_waitqueue_head(wqh)        do { } while(0)
 193
 194 struct rhashtable {
 195 };
 196
 197 struct delayed_work {
 198 };
 199
 200 #define INIT_DELAYED_WORK(work, func)   do { } while(0)
 201 #define cancel_delayed_work_sync(work)  do { } while(0)
 202
 203 #endif /* __XFS_SHARED_H__ */