fs/xfs/xfs_log_recover.h

   1 /*
   2  * Copyright (c) 2000,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_LOG_RECOVER_H__
  19 #define __XFS_LOG_RECOVER_H__
  20
  21 /*
  22  * Macros, structures, prototypes for internal log manager use.
  23  */
  24
  25 #define XLOG_RHASH_BITS  4
  26 #define XLOG_RHASH_SIZE 16
  27 #define XLOG_RHASH_SHIFT 2
  28 #define XLOG_RHASH(tid) \
  29         ((((__uint32_t)tid)>>XLOG_RHASH_SHIFT) & (XLOG_RHASH_SIZE-1))
  30
  31 #define XLOG_MAX_REGIONS_IN_ITEM   (XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK / 2 + 1)
  32
  33
  34 /*
  35  * item headers are in ri_buf[0].  Additional buffers follow.
  36  */
  37 typedef struct xlog_recover_item {
  38         struct list_head        ri_list;
  39         int                     ri_type;
  40         int                     ri_cnt; /* count of regions found */
  41         int                     ri_total;       /* total regions */
  42         xfs_log_iovec_t         *ri_buf;        /* ptr to regions buffer */
  43 } xlog_recover_item_t;
  44
  45 struct xlog_tid;
  46 typedef struct xlog_recover {
  47         struct hlist_node       r_list;
  48         xlog_tid_t              r_log_tid;      /* log's transaction id */
  49         xfs_trans_header_t      r_theader;      /* trans header for partial */
  50         int                     r_state;        /* not needed */
  51         xfs_lsn_t               r_lsn;          /* xact lsn */
  52         struct list_head        r_itemq;        /* q for items */
  53 } xlog_recover_t;
  54
  55 #define ITEM_TYPE(i)    (*(ushort *)(i)->ri_buf[0].i_addr)
  56
  57 /*
  58  * This is the number of entries in the l_buf_cancel_table used during
  59  * recovery.
  60  */
  61 #define XLOG_BC_TABLE_SIZE      64
  62
  63 #define XLOG_RECOVER_PASS1      1
  64 #define XLOG_RECOVER_PASS2      2
  65
  66 #endif  /* __XFS_LOG_RECOVER_H__ */