fs/xfs/xfs_log.h

   1 /*
   2  * Copyright (c) 2000-2003,2005 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_H__
  19 #define __XFS_LOG_H__
  20
  21 struct xfs_log_vec {
  22         struct xfs_log_vec      *lv_next;       /* next lv in build list */
  23         int                     lv_niovecs;     /* number of iovecs in lv */
  24         struct xfs_log_iovec    *lv_iovecp;     /* iovec array */
  25         struct xfs_log_item     *lv_item;       /* owner */
  26         char                    *lv_buf;        /* formatted buffer */
  27         int                     lv_buf_len;     /* size of formatted buffer */
  28         int                     lv_size;        /* size of allocated lv */
  29 };
  30
  31 #define XFS_LOG_VEC_ORDERED     (-1)
  32
  33 /*
  34  * Structure used to pass callback function and the function's argument
  35  * to the log manager.
  36  */
  37 typedef struct xfs_log_callback {
  38         struct xfs_log_callback *cb_next;
  39         void                    (*cb_func)(void *, int);
  40         void                    *cb_arg;
  41 } xfs_log_callback_t;
  42
  43 /*
  44  * By comparing each component, we don't have to worry about extra
  45  * endian issues in treating two 32 bit numbers as one 64 bit number
  46  */
  47 static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
  48 {
  49         if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
  50                 return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
  51
  52         if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
  53                 return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
  54
  55         return 0;
  56 }
  57
  58 #define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
  59
  60 /*
  61  * Macros, structures, prototypes for interface to the log manager.
  62  */
  63
  64 /*
  65  * Flags to xfs_log_done()
  66  */
  67 #define XFS_LOG_REL_PERM_RESERV 0x1
  68
  69 /*
  70  * Flags to xfs_log_force()
  71  *
  72  *      XFS_LOG_SYNC:   Synchronous force in-core log to disk
  73  */
  74 #define XFS_LOG_SYNC            0x1
  75
  76 /* Log manager interfaces */
  77 struct xfs_mount;
  78 struct xlog_in_core;
  79 struct xlog_ticket;
  80 struct xfs_log_item;
  81 struct xfs_item_ops;
  82 struct xfs_trans;
  83 struct xfs_log_callback;
  84
  85 xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
  86                        struct xlog_ticket *ticket,
  87                        struct xlog_in_core **iclog,
  88                        uint             flags);
  89 int       _xfs_log_force(struct xfs_mount *mp,
  90                          uint           flags,
  91                          int            *log_forced);
  92 void      xfs_log_force(struct xfs_mount        *mp,
  93                         uint                    flags);
  94 int       _xfs_log_force_lsn(struct xfs_mount *mp,
  95                              xfs_lsn_t          lsn,
  96                              uint               flags,
  97                              int                *log_forced);
  98 void      xfs_log_force_lsn(struct xfs_mount    *mp,
  99                             xfs_lsn_t           lsn,
 100                             uint                flags);
 101 int       xfs_log_mount(struct xfs_mount        *mp,
 102                         struct xfs_buftarg      *log_target,
 103                         xfs_daddr_t             start_block,
 104                         int                     num_bblocks);
 105 int       xfs_log_mount_finish(struct xfs_mount *mp);
 106 xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
 107 xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp);
 108 void      xfs_log_space_wake(struct xfs_mount *mp);
 109 int       xfs_log_notify(struct xfs_mount       *mp,
 110                          struct xlog_in_core    *iclog,
 111                          struct xfs_log_callback *callback_entry);
 112 int       xfs_log_release_iclog(struct xfs_mount *mp,
 113                          struct xlog_in_core     *iclog);
 114 int       xfs_log_reserve(struct xfs_mount *mp,
 115                           int              length,
 116                           int              count,
 117                           struct xlog_ticket **ticket,
 118                           __uint8_t        clientid,
 119                           bool             permanent,
 120                           uint             t_type);
 121 int       xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
 122 int       xfs_log_unmount_write(struct xfs_mount *mp);
 123 void      xfs_log_unmount(struct xfs_mount *mp);
 124 int       xfs_log_force_umount(struct xfs_mount *mp, int logerror);
 125 int       xfs_log_need_covered(struct xfs_mount *mp);
 126
 127 void      xlog_iodone(struct xfs_buf *);
 128
 129 struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
 130 void      xfs_log_ticket_put(struct xlog_ticket *ticket);
 131
 132 int     xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp,
 133                                 xfs_lsn_t *commit_lsn, int flags);
 134 bool    xfs_log_item_in_current_chkpt(struct xfs_log_item *lip);
 135
 136 void    xfs_log_work_queue(struct xfs_mount *mp);
 137 void    xfs_log_worker(struct work_struct *work);
 138 void    xfs_log_quiesce(struct xfs_mount *mp);
 139
 140 #endif  /* __XFS_LOG_H__ */