libxfs/xfs_shared.h

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * Copyright (c) 2013 Red Hat, Inc.
   4  * All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it would be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write the Free Software Foundation,
  17  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19 #ifndef __XFS_SHARED_H__
  20 #define __XFS_SHARED_H__
  21
  22 /*
  23  * Definitions shared between kernel and userspace that don't fit into any other
  24  * header file that is shared with userspace.
  25  */
  26 struct xfs_ifork;
  27 struct xfs_buf;
  28 struct xfs_buf_ops;
  29 struct xfs_mount;
  30 struct xfs_trans;
  31 struct xfs_inode;
  32
  33 /*
  34  * Buffer verifier operations are widely used, including userspace tools
  35  */
  36 extern const struct xfs_buf_ops xfs_agf_buf_ops;
  37 extern const struct xfs_buf_ops xfs_agi_buf_ops;
  38 extern const struct xfs_buf_ops xfs_agf_buf_ops;
  39 extern const struct xfs_buf_ops xfs_agfl_buf_ops;
  40 extern const struct xfs_buf_ops xfs_allocbt_buf_ops;
  41 extern const struct xfs_buf_ops xfs_rmapbt_buf_ops;
  42 extern const struct xfs_buf_ops xfs_attr3_leaf_buf_ops;
  43 extern const struct xfs_buf_ops xfs_attr3_rmt_buf_ops;
  44 extern const struct xfs_buf_ops xfs_bmbt_buf_ops;
  45 extern const struct xfs_buf_ops xfs_da3_node_buf_ops;
  46 extern const struct xfs_buf_ops xfs_dquot_buf_ops;
  47 extern const struct xfs_buf_ops xfs_symlink_buf_ops;
  48 extern const struct xfs_buf_ops xfs_agi_buf_ops;
  49 extern const struct xfs_buf_ops xfs_inobt_buf_ops;
  50 extern const struct xfs_buf_ops xfs_inode_buf_ops;
  51 extern const struct xfs_buf_ops xfs_inode_buf_ra_ops;
  52 extern const struct xfs_buf_ops xfs_dquot_buf_ops;
  53 extern const struct xfs_buf_ops xfs_dquot_buf_ra_ops;
  54 extern const struct xfs_buf_ops xfs_sb_buf_ops;
  55 extern const struct xfs_buf_ops xfs_sb_quiet_buf_ops;
  56 extern const struct xfs_buf_ops xfs_symlink_buf_ops;
  57 extern const struct xfs_buf_ops xfs_rtbuf_ops;
  58
  59 /*
  60  * This structure is used to track log items associated with
  61  * a transaction.  It points to the log item and keeps some
  62  * flags to track the state of the log item.  It also tracks
  63  * the amount of space needed to log the item it describes
  64  * once we get to commit processing (see xfs_trans_commit()).
  65  */
  66 struct xfs_log_item_desc {
  67         struct xfs_log_item     *lid_item;
  68         struct list_head        lid_trans;
  69         unsigned char           lid_flags;
  70 };
  71
  72 #define XFS_LID_DIRTY           0x1
  73
  74 /* log size calculation functions */
  75 int     xfs_log_calc_unit_res(struct xfs_mount *mp, int unit_bytes);
  76 int     xfs_log_calc_minimum_size(struct xfs_mount *);
  77
  78
  79 /*
  80  * Values for t_flags.
  81  */
  82 #define XFS_TRANS_DIRTY         0x01    /* something needs to be logged */
  83 #define XFS_TRANS_SB_DIRTY      0x02    /* superblock is modified */
  84 #define XFS_TRANS_PERM_LOG_RES  0x04    /* xact took a permanent log res */
  85 #define XFS_TRANS_SYNC          0x08    /* make commit synchronous */
  86 #define XFS_TRANS_DQ_DIRTY      0x10    /* at least one dquot in trx dirty */
  87 #define XFS_TRANS_RESERVE       0x20    /* OK to use reserved data blocks */
  88 #define XFS_TRANS_NO_WRITECOUNT 0x40    /* do not elevate SB writecount */
  89 #define XFS_TRANS_NOFS          0x80    /* pass KM_NOFS to kmem_alloc */
  90
  91 /*
  92  * Field values for xfs_trans_mod_sb.
  93  */
  94 #define XFS_TRANS_SB_ICOUNT             0x00000001
  95 #define XFS_TRANS_SB_IFREE              0x00000002
  96 #define XFS_TRANS_SB_FDBLOCKS           0x00000004
  97 #define XFS_TRANS_SB_RES_FDBLOCKS       0x00000008
  98 #define XFS_TRANS_SB_FREXTENTS          0x00000010
  99 #define XFS_TRANS_SB_RES_FREXTENTS      0x00000020
 100 #define XFS_TRANS_SB_DBLOCKS            0x00000040
 101 #define XFS_TRANS_SB_AGCOUNT            0x00000080
 102 #define XFS_TRANS_SB_IMAXPCT            0x00000100
 103 #define XFS_TRANS_SB_REXTSIZE           0x00000200
 104 #define XFS_TRANS_SB_RBMBLOCKS          0x00000400
 105 #define XFS_TRANS_SB_RBLOCKS            0x00000800
 106 #define XFS_TRANS_SB_REXTENTS           0x00001000
 107 #define XFS_TRANS_SB_REXTSLOG           0x00002000
 108
 109 /*
 110  * Here we centralize the specification of XFS meta-data buffer reference count
 111  * values.  This determines how hard the buffer cache tries to hold onto the
 112  * buffer.
 113  */
 114 #define XFS_AGF_REF             4
 115 #define XFS_AGI_REF             4
 116 #define XFS_AGFL_REF            3
 117 #define XFS_INO_BTREE_REF       3
 118 #define XFS_ALLOC_BTREE_REF     2
 119 #define XFS_BMAP_BTREE_REF      2
 120 #define XFS_RMAP_BTREE_REF      2
 121 #define XFS_DIR_BTREE_REF       2
 122 #define XFS_INO_REF             2
 123 #define XFS_ATTR_BTREE_REF      1
 124 #define XFS_DQUOT_REF           1
 125
 126 /*
 127  * Flags for xfs_trans_ichgtime().
 128  */
 129 #define XFS_ICHGTIME_MOD        0x1     /* data fork modification timestamp */
 130 #define XFS_ICHGTIME_CHG        0x2     /* inode field change timestamp */
 131 #define XFS_ICHGTIME_CREATE     0x4     /* inode create timestamp */
 132
 133
 134 /*
 135  * Symlink decoding/encoding functions
 136  */
 137 int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen);
 138 int xfs_symlink_hdr_set(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset,
 139                         uint32_t size, struct xfs_buf *bp);
 140 bool xfs_symlink_hdr_ok(xfs_ino_t ino, uint32_t offset,
 141                         uint32_t size, struct xfs_buf *bp);
 142 void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp,
 143                                  struct xfs_inode *ip, struct xfs_ifork *ifp);
 144
 145 #endif /* __XFS_SHARED_H__ */