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 /* get lsn fields */
  22
  23 #define CYCLE_LSN(lsn) ((uint)((lsn)>>32))
  24 #define BLOCK_LSN(lsn) ((uint)(lsn))
  25
  26 /* this is used in a spot where we might otherwise double-endian-flip */
  27 #define CYCLE_LSN_DISK(lsn) (((__be32 *)&(lsn))[0])
  28
  29 #ifdef __KERNEL__
  30 /*
  31  * By comparing each component, we don't have to worry about extra
  32  * endian issues in treating two 32 bit numbers as one 64 bit number
  33  */
  34 static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
  35 {
  36         if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
  37                 return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
  38
  39         if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
  40                 return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
  41
  42         return 0;
  43 }
  44
  45 #define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
  46
  47 /*
  48  * Macros, structures, prototypes for interface to the log manager.
  49  */
  50
  51 /*
  52  * Flags to xfs_log_done()
  53  */
  54 #define XFS_LOG_REL_PERM_RESERV 0x1
  55
  56 /*
  57  * Flags to xfs_log_reserve()
  58  *
  59  *      XFS_LOG_SLEEP:   If space is not available, sleep (default)
  60  *      XFS_LOG_NOSLEEP: If space is not available, return error
  61  *      XFS_LOG_PERM_RESERV: Permanent reservation.  When writes are
  62  *              performed against this type of reservation, the reservation
  63  *              is not decreased.  Long running transactions should use this.
  64  */
  65 #define XFS_LOG_SLEEP           0x0
  66 #define XFS_LOG_NOSLEEP         0x1
  67 #define XFS_LOG_PERM_RESERV     0x2
  68
  69 /*
  70  * Flags to xfs_log_force()
  71  *
  72  *      XFS_LOG_SYNC:   Synchronous force in-core log to disk
  73  *      XFS_LOG_FORCE:  Start in-core log write now.
  74  *      XFS_LOG_URGE:   Start write within some window of time.
  75  *
  76  * Note: Either XFS_LOG_FORCE or XFS_LOG_URGE must be set.
  77  */
  78 #define XFS_LOG_SYNC            0x1
  79 #define XFS_LOG_FORCE           0x2
  80 #define XFS_LOG_URGE            0x4
  81
  82 #endif  /* __KERNEL__ */
  83
  84
  85 /* Log Clients */
  86 #define XFS_TRANSACTION         0x69
  87 #define XFS_VOLUME              0x2
  88 #define XFS_LOG                 0xaa
  89
  90
  91 /* Region types for iovec's i_type */
  92 #define XLOG_REG_TYPE_BFORMAT           1
  93 #define XLOG_REG_TYPE_BCHUNK            2
  94 #define XLOG_REG_TYPE_EFI_FORMAT        3
  95 #define XLOG_REG_TYPE_EFD_FORMAT        4
  96 #define XLOG_REG_TYPE_IFORMAT           5
  97 #define XLOG_REG_TYPE_ICORE             6
  98 #define XLOG_REG_TYPE_IEXT              7
  99 #define XLOG_REG_TYPE_IBROOT            8
 100 #define XLOG_REG_TYPE_ILOCAL            9
 101 #define XLOG_REG_TYPE_IATTR_EXT         10
 102 #define XLOG_REG_TYPE_IATTR_BROOT       11
 103 #define XLOG_REG_TYPE_IATTR_LOCAL       12
 104 #define XLOG_REG_TYPE_QFORMAT           13
 105 #define XLOG_REG_TYPE_DQUOT             14
 106 #define XLOG_REG_TYPE_QUOTAOFF          15
 107 #define XLOG_REG_TYPE_LRHEADER          16
 108 #define XLOG_REG_TYPE_UNMOUNT           17
 109 #define XLOG_REG_TYPE_COMMIT            18
 110 #define XLOG_REG_TYPE_TRANSHDR          19
 111 #define XLOG_REG_TYPE_MAX               19
 112
 113 #define XLOG_VEC_SET_TYPE(vecp, t) ((vecp)->i_type = (t))
 114
 115 typedef struct xfs_log_iovec {
 116         xfs_caddr_t             i_addr;         /* beginning address of region */
 117         int             i_len;          /* length in bytes of region */
 118         uint            i_type;         /* type of region */
 119 } xfs_log_iovec_t;
 120
 121 typedef void* xfs_log_ticket_t;
 122
 123 /*
 124  * Structure used to pass callback function and the function's argument
 125  * to the log manager.
 126  */
 127 typedef struct xfs_log_callback {
 128         struct xfs_log_callback *cb_next;
 129         void                    (*cb_func)(void *, int);
 130         void                    *cb_arg;
 131 } xfs_log_callback_t;
 132
 133
 134 #ifdef __KERNEL__
 135 /* Log manager interfaces */
 136 struct xfs_mount;
 137 struct xlog_ticket;
 138 xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
 139                        xfs_log_ticket_t ticket,
 140                        void             **iclog,
 141                        uint             flags);
 142 int       _xfs_log_force(struct xfs_mount *mp,
 143                          xfs_lsn_t      lsn,
 144                          uint           flags,
 145                          int            *log_forced);
 146 void      xfs_log_force(struct xfs_mount        *mp,
 147                         xfs_lsn_t               lsn,
 148                         uint                    flags);
 149 int       xfs_log_mount(struct xfs_mount        *mp,
 150                         struct xfs_buftarg      *log_target,
 151                         xfs_daddr_t             start_block,
 152                         int                     num_bblocks);
 153 int       xfs_log_mount_finish(struct xfs_mount *mp);
 154 void      xfs_log_move_tail(struct xfs_mount    *mp,
 155                             xfs_lsn_t           tail_lsn);
 156 int       xfs_log_notify(struct xfs_mount       *mp,
 157                          void                   *iclog,
 158                          xfs_log_callback_t     *callback_entry);
 159 int       xfs_log_release_iclog(struct xfs_mount *mp,
 160                          void                    *iclog_hndl);
 161 int       xfs_log_reserve(struct xfs_mount *mp,
 162                           int              length,
 163                           int              count,
 164                           xfs_log_ticket_t *ticket,
 165                           __uint8_t        clientid,
 166                           uint             flags,
 167                           uint             t_type);
 168 int       xfs_log_write(struct xfs_mount *mp,
 169                         xfs_log_iovec_t  region[],
 170                         int              nentries,
 171                         xfs_log_ticket_t ticket,
 172                         xfs_lsn_t        *start_lsn);
 173 int       xfs_log_unmount_write(struct xfs_mount *mp);
 174 void      xfs_log_unmount(struct xfs_mount *mp);
 175 int       xfs_log_force_umount(struct xfs_mount *mp, int logerror);
 176 int       xfs_log_need_covered(struct xfs_mount *mp);
 177
 178 void      xlog_iodone(struct xfs_buf *);
 179
 180 struct xlog_ticket * xfs_log_ticket_get(struct xlog_ticket *ticket);
 181 void      xfs_log_ticket_put(struct xlog_ticket *ticket);
 182
 183 #endif
 184
 185
 186 extern int xlog_debug;          /* set to 1 to enable real log */
 187
 188
 189 #endif  /* __XFS_LOG_H__ */