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