fs/xfs/xfs_log.h

   1 /*
   2  * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #ifndef __XFS_LOG_H__
  33 #define __XFS_LOG_H__
  34
  35 #if __BYTE_ORDER == __LITTLE_ENDIAN
  36 #define LSN_FIELD_CYCLE(arch) (((arch)==ARCH_NOCONVERT)?1:0)
  37 #define LSN_FIELD_BLOCK(arch) (((arch)==ARCH_NOCONVERT)?0:1)
  38 #else
  39 #define LSN_FIELD_CYCLE(arch) (0)
  40 #define LSN_FIELD_BLOCK(arch) (1)
  41 #endif
  42
  43 /* get lsn fields */
  44
  45 #define CYCLE_LSN(lsn,arch) (INT_GET(((uint *)&(lsn))[LSN_FIELD_CYCLE(arch)], arch))
  46 #define BLOCK_LSN(lsn,arch) (INT_GET(((uint *)&(lsn))[LSN_FIELD_BLOCK(arch)], arch))
  47 /* this is used in a spot where we might otherwise double-endian-flip */
  48 #define CYCLE_LSN_NOCONV(lsn,arch) (((uint *)&(lsn))[LSN_FIELD_CYCLE(arch)])
  49
  50 #ifdef __KERNEL__
  51 /*
  52  * By comparing each compnent, we don't have to worry about extra
  53  * endian issues in treating two 32 bit numbers as one 64 bit number
  54  */
  55 static
  56 #if defined(__GNUC__) && (__GNUC__ == 2) && ( (__GNUC_MINOR__ == 95) || (__GNUC_MINOR__ == 96))
  57 __attribute__((unused)) /* gcc 2.95, 2.96 miscompile this when inlined */
  58 #else
  59 __inline__
  60 #endif
  61 xfs_lsn_t       _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2, xfs_arch_t arch)
  62 {
  63         if (CYCLE_LSN(lsn1, arch) != CYCLE_LSN(lsn2, arch))
  64                 return (CYCLE_LSN(lsn1, arch)<CYCLE_LSN(lsn2, arch))? -999 : 999;
  65
  66         if (BLOCK_LSN(lsn1, arch) != BLOCK_LSN(lsn2, arch))
  67                 return (BLOCK_LSN(lsn1, arch)<BLOCK_LSN(lsn2, arch))? -999 : 999;
  68
  69         return 0;
  70 }
  71
  72 #define XFS_LSN_CMP_ARCH(x,y,arch)      _lsn_cmp(x, y, arch)
  73 #define XFS_LSN_CMP(x,y) XFS_LSN_CMP_ARCH(x,y,ARCH_NOCONVERT)
  74 #define XFS_LSN_DIFF_ARCH(x,y,arch)     _lsn_cmp(x, y, arch)
  75 #define XFS_LSN_DIFF(x,y) XFS_LSN_DIFF_ARCH(x,y,ARCH_NOCONVERT)
  76
  77 /*
  78  * Macros, structures, prototypes for interface to the log manager.
  79  */
  80
  81 /*
  82  * Flags to xfs_log_mount
  83  */
  84 #define XFS_LOG_RECOVER         0x1
  85
  86 /*
  87  * Flags to xfs_log_done()
  88  */
  89 #define XFS_LOG_REL_PERM_RESERV 0x1
  90
  91
  92 /*
  93  * Flags to xfs_log_reserve()
  94  *
  95  *      XFS_LOG_SLEEP:   If space is not available, sleep (default)
  96  *      XFS_LOG_NOSLEEP: If space is not available, return error
  97  *      XFS_LOG_PERM_RESERV: Permanent reservation.  When writes are
  98  *              performed against this type of reservation, the reservation
  99  *              is not decreased.  Long running transactions should use this.
 100  */
 101 #define XFS_LOG_SLEEP           0x0
 102 #define XFS_LOG_NOSLEEP         0x1
 103 #define XFS_LOG_PERM_RESERV     0x2
 104 #define XFS_LOG_RESV_ALL        (XFS_LOG_NOSLEEP|XFS_LOG_PERM_RESERV)
 105
 106
 107 /*
 108  * Flags to xfs_log_force()
 109  *
 110  *      XFS_LOG_SYNC:   Synchronous force in-core log to disk
 111  *      XFS_LOG_FORCE:  Start in-core log write now.
 112  *      XFS_LOG_URGE:   Start write within some window of time.
 113  *
 114  * Note: Either XFS_LOG_FORCE or XFS_LOG_URGE must be set.
 115  */
 116 #define XFS_LOG_SYNC            0x1
 117 #define XFS_LOG_FORCE           0x2
 118 #define XFS_LOG_URGE            0x4
 119
 120 #endif  /* __KERNEL__ */
 121
 122
 123 /* Log Clients */
 124 #define XFS_TRANSACTION         0x69
 125 #define XFS_VOLUME              0x2
 126 #define XFS_LOG                 0xaa
 127
 128 typedef struct xfs_log_iovec {
 129         xfs_caddr_t             i_addr;         /* beginning address of region */
 130         int             i_len;          /* length in bytes of region */
 131 } xfs_log_iovec_t;
 132
 133 typedef void* xfs_log_ticket_t;
 134
 135 /*
 136  * Structure used to pass callback function and the function's argument
 137  * to the log manager.
 138  */
 139 typedef struct xfs_log_callback {
 140         struct xfs_log_callback *cb_next;
 141         void                    (*cb_func)(void *, int);
 142         void                    *cb_arg;
 143 } xfs_log_callback_t;
 144
 145
 146 #ifdef __KERNEL__
 147 /* Log manager interfaces */
 148 struct xfs_mount;
 149 xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
 150                        xfs_log_ticket_t ticket,
 151                        void             **iclog,
 152                        uint             flags);
 153 int       xfs_log_force(struct xfs_mount *mp,
 154                         xfs_lsn_t        lsn,
 155                         uint             flags);
 156 int       xfs_log_mount(struct xfs_mount        *mp,
 157                         struct xfs_buftarg      *log_target,
 158                         xfs_daddr_t             start_block,
 159                         int                     num_bblocks);
 160 int       xfs_log_mount_finish(struct xfs_mount *mp, int);
 161 void      xfs_log_move_tail(struct xfs_mount    *mp,
 162                             xfs_lsn_t           tail_lsn);
 163 int       xfs_log_notify(struct xfs_mount       *mp,
 164                          void                   *iclog,
 165                          xfs_log_callback_t     *callback_entry);
 166 int       xfs_log_release_iclog(struct xfs_mount *mp,
 167                          void                    *iclog_hndl);
 168 int       xfs_log_reserve(struct xfs_mount *mp,
 169                           int              length,
 170                           int              count,
 171                           xfs_log_ticket_t *ticket,
 172                           __uint8_t        clientid,
 173                           uint             flags);
 174 int       xfs_log_write(struct xfs_mount *mp,
 175                         xfs_log_iovec_t  region[],
 176                         int              nentries,
 177                         xfs_log_ticket_t ticket,
 178                         xfs_lsn_t        *start_lsn);
 179 int       xfs_log_unmount(struct xfs_mount *mp);
 180 int       xfs_log_unmount_write(struct xfs_mount *mp);
 181 void      xfs_log_unmount_dealloc(struct xfs_mount *mp);
 182 int       xfs_log_force_umount(struct xfs_mount *mp, int logerror);
 183 int       xfs_log_need_covered(struct xfs_mount *mp);
 184
 185 void      xlog_iodone(struct xfs_buf *);
 186
 187 #endif
 188
 189
 190 extern int xlog_debug;          /* set to 1 to enable real log */
 191
 192
 193 #endif  /* __XFS_LOG_H__ */