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 compnent, 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_mount
  52  */
  53 #define XFS_LOG_RECOVER         0x1
  54
  55 /*
  56  * Flags to xfs_log_done()
  57  */
  58 #define XFS_LOG_REL_PERM_RESERV 0x1
  59
  60
  61 /*
  62  * Flags to xfs_log_reserve()
  63  *
  64  *      XFS_LOG_SLEEP:   If space is not available, sleep (default)
  65  *      XFS_LOG_NOSLEEP: If space is not available, return error
  66  *      XFS_LOG_PERM_RESERV: Permanent reservation.  When writes are
  67  *              performed against this type of reservation, the reservation
  68  *              is not decreased.  Long running transactions should use this.
  69  */
  70 #define XFS_LOG_SLEEP           0x0
  71 #define XFS_LOG_NOSLEEP         0x1
  72 #define XFS_LOG_PERM_RESERV     0x2
  73 #define XFS_LOG_RESV_ALL        (XFS_LOG_NOSLEEP|XFS_LOG_PERM_RESERV)
  74
  75
  76 /*
  77  * Flags to xfs_log_force()
  78  *
  79  *      XFS_LOG_SYNC:   Synchronous force in-core log to disk
  80  *      XFS_LOG_FORCE:  Start in-core log write now.
  81  *      XFS_LOG_URGE:   Start write within some window of time.
  82  *
  83  * Note: Either XFS_LOG_FORCE or XFS_LOG_URGE must be set.
  84  */
  85 #define XFS_LOG_SYNC            0x1
  86 #define XFS_LOG_FORCE           0x2
  87 #define XFS_LOG_URGE            0x4
  88
  89 #endif  /* __KERNEL__ */
  90
  91
  92 /* Log Clients */
  93 #define XFS_TRANSACTION         0x69
  94 #define XFS_VOLUME              0x2
  95 #define XFS_LOG                 0xaa
  96
  97
  98 /* Region types for iovec's i_type */
  99 #define XLOG_REG_TYPE_BFORMAT           1
 100 #define XLOG_REG_TYPE_BCHUNK            2
 101 #define XLOG_REG_TYPE_EFI_FORMAT        3
 102 #define XLOG_REG_TYPE_EFD_FORMAT        4
 103 #define XLOG_REG_TYPE_IFORMAT           5
 104 #define XLOG_REG_TYPE_ICORE             6
 105 #define XLOG_REG_TYPE_IEXT              7
 106 #define XLOG_REG_TYPE_IBROOT            8
 107 #define XLOG_REG_TYPE_ILOCAL            9
 108 #define XLOG_REG_TYPE_IATTR_EXT         10
 109 #define XLOG_REG_TYPE_IATTR_BROOT       11
 110 #define XLOG_REG_TYPE_IATTR_LOCAL       12
 111 #define XLOG_REG_TYPE_QFORMAT           13
 112 #define XLOG_REG_TYPE_DQUOT             14
 113 #define XLOG_REG_TYPE_QUOTAOFF          15
 114 #define XLOG_REG_TYPE_LRHEADER          16
 115 #define XLOG_REG_TYPE_UNMOUNT           17
 116 #define XLOG_REG_TYPE_COMMIT            18
 117 #define XLOG_REG_TYPE_TRANSHDR          19
 118 #define XLOG_REG_TYPE_MAX               19
 119
 120 #define XLOG_VEC_SET_TYPE(vecp, t) ((vecp)->i_type = (t))
 121
 122 typedef struct xfs_log_iovec {
 123         xfs_caddr_t             i_addr;         /* beginning address of region */
 124         int             i_len;          /* length in bytes of region */
 125         uint            i_type;         /* type of region */
 126 } xfs_log_iovec_t;
 127
 128 typedef void* xfs_log_ticket_t;
 129
 130 /*
 131  * Structure used to pass callback function and the function's argument
 132  * to the log manager.
 133  */
 134 typedef struct xfs_log_callback {
 135         struct xfs_log_callback *cb_next;
 136         void                    (*cb_func)(void *, int);
 137         void                    *cb_arg;
 138 } xfs_log_callback_t;
 139
 140
 141 #ifdef __KERNEL__
 142 /* Log manager interfaces */
 143 struct xfs_mount;
 144 xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
 145                        xfs_log_ticket_t ticket,
 146                        void             **iclog,
 147                        uint             flags);
 148 int       _xfs_log_force(struct xfs_mount *mp,
 149                          xfs_lsn_t      lsn,
 150                          uint           flags,
 151                          int            *log_forced);
 152 #define xfs_log_force(mp, lsn, flags) \
 153         _xfs_log_force(mp, lsn, flags, NULL);
 154 int       xfs_log_mount(struct xfs_mount        *mp,
 155                         struct xfs_buftarg      *log_target,
 156                         xfs_daddr_t             start_block,
 157                         int                     num_bblocks);
 158 int       xfs_log_mount_finish(struct xfs_mount *mp, int);
 159 void      xfs_log_move_tail(struct xfs_mount    *mp,
 160                             xfs_lsn_t           tail_lsn);
 161 int       xfs_log_notify(struct xfs_mount       *mp,
 162                          void                   *iclog,
 163                          xfs_log_callback_t     *callback_entry);
 164 int       xfs_log_release_iclog(struct xfs_mount *mp,
 165                          void                    *iclog_hndl);
 166 int       xfs_log_reserve(struct xfs_mount *mp,
 167                           int              length,
 168                           int              count,
 169                           xfs_log_ticket_t *ticket,
 170                           __uint8_t        clientid,
 171                           uint             flags,
 172                           uint             t_type);
 173 int       xfs_log_write(struct xfs_mount *mp,
 174                         xfs_log_iovec_t  region[],
 175                         int              nentries,
 176                         xfs_log_ticket_t ticket,
 177                         xfs_lsn_t        *start_lsn);
 178 int       xfs_log_unmount(struct xfs_mount *mp);
 179 int       xfs_log_unmount_write(struct xfs_mount *mp);
 180 void      xfs_log_unmount_dealloc(struct xfs_mount *mp);
 181 int       xfs_log_force_umount(struct xfs_mount *mp, int logerror);
 182 int       xfs_log_need_covered(struct xfs_mount *mp);
 183
 184 void      xlog_iodone(struct xfs_buf *);
 185
 186 #endif
 187
 188
 189 extern int xlog_debug;          /* set to 1 to enable real log */
 190
 191
 192 #endif  /* __XFS_LOG_H__ */