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 /* get lsn fields */
  36
  37 #define CYCLE_LSN(lsn) ((uint)((lsn)>>32))
  38 #define BLOCK_LSN(lsn) ((uint)(lsn))
  39 /* this is used in a spot where we might otherwise double-endian-flip */
  40 #define CYCLE_LSN_DISK(lsn) (((uint *)&(lsn))[0])
  41
  42 #ifdef __KERNEL__
  43 /*
  44  * By comparing each compnent, 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
  48 #if defined(__GNUC__) && (__GNUC__ == 2) && ( (__GNUC_MINOR__ == 95) || (__GNUC_MINOR__ == 96))
  49 __attribute__((unused)) /* gcc 2.95, 2.96 miscompile this when inlined */
  50 #else
  51 __inline__
  52 #endif
  53 xfs_lsn_t       _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
  54 {
  55         if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
  56                 return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
  57
  58         if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
  59                 return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
  60
  61         return 0;
  62 }
  63
  64 #define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
  65
  66 /*
  67  * Macros, structures, prototypes for interface to the log manager.
  68  */
  69
  70 /*
  71  * Flags to xfs_log_mount
  72  */
  73 #define XFS_LOG_RECOVER         0x1
  74
  75 /*
  76  * Flags to xfs_log_done()
  77  */
  78 #define XFS_LOG_REL_PERM_RESERV 0x1
  79
  80
  81 /*
  82  * Flags to xfs_log_reserve()
  83  *
  84  *      XFS_LOG_SLEEP:   If space is not available, sleep (default)
  85  *      XFS_LOG_NOSLEEP: If space is not available, return error
  86  *      XFS_LOG_PERM_RESERV: Permanent reservation.  When writes are
  87  *              performed against this type of reservation, the reservation
  88  *              is not decreased.  Long running transactions should use this.
  89  */
  90 #define XFS_LOG_SLEEP           0x0
  91 #define XFS_LOG_NOSLEEP         0x1
  92 #define XFS_LOG_PERM_RESERV     0x2
  93 #define XFS_LOG_RESV_ALL        (XFS_LOG_NOSLEEP|XFS_LOG_PERM_RESERV)
  94
  95
  96 /*
  97  * Flags to xfs_log_force()
  98  *
  99  *      XFS_LOG_SYNC:   Synchronous force in-core log to disk
 100  *      XFS_LOG_FORCE:  Start in-core log write now.
 101  *      XFS_LOG_URGE:   Start write within some window of time.
 102  *
 103  * Note: Either XFS_LOG_FORCE or XFS_LOG_URGE must be set.
 104  */
 105 #define XFS_LOG_SYNC            0x1
 106 #define XFS_LOG_FORCE           0x2
 107 #define XFS_LOG_URGE            0x4
 108
 109 #endif  /* __KERNEL__ */
 110
 111
 112 /* Log Clients */
 113 #define XFS_TRANSACTION         0x69
 114 #define XFS_VOLUME              0x2
 115 #define XFS_LOG                 0xaa
 116
 117
 118 /* Region types for iovec's i_type */
 119 #if defined(XFS_LOG_RES_DEBUG)
 120 #define XLOG_REG_TYPE_BFORMAT           1
 121 #define XLOG_REG_TYPE_BCHUNK            2
 122 #define XLOG_REG_TYPE_EFI_FORMAT        3
 123 #define XLOG_REG_TYPE_EFD_FORMAT        4
 124 #define XLOG_REG_TYPE_IFORMAT           5
 125 #define XLOG_REG_TYPE_ICORE             6
 126 #define XLOG_REG_TYPE_IEXT              7
 127 #define XLOG_REG_TYPE_IBROOT            8
 128 #define XLOG_REG_TYPE_ILOCAL            9
 129 #define XLOG_REG_TYPE_IATTR_EXT         10
 130 #define XLOG_REG_TYPE_IATTR_BROOT       11
 131 #define XLOG_REG_TYPE_IATTR_LOCAL       12
 132 #define XLOG_REG_TYPE_QFORMAT           13
 133 #define XLOG_REG_TYPE_DQUOT             14
 134 #define XLOG_REG_TYPE_QUOTAOFF          15
 135 #define XLOG_REG_TYPE_LRHEADER          16
 136 #define XLOG_REG_TYPE_UNMOUNT           17
 137 #define XLOG_REG_TYPE_COMMIT            18
 138 #define XLOG_REG_TYPE_TRANSHDR          19
 139 #define XLOG_REG_TYPE_MAX               19
 140 #endif
 141
 142 #if defined(XFS_LOG_RES_DEBUG)
 143 #define XLOG_VEC_SET_TYPE(vecp, t) ((vecp)->i_type = (t))
 144 #else
 145 #define XLOG_VEC_SET_TYPE(vecp, t)
 146 #endif
 147
 148
 149 typedef struct xfs_log_iovec {
 150         xfs_caddr_t             i_addr;         /* beginning address of region */
 151         int             i_len;          /* length in bytes of region */
 152 #if defined(XFS_LOG_RES_DEBUG)
 153         uint            i_type;         /* type of region */
 154 #endif
 155 } xfs_log_iovec_t;
 156
 157 typedef void* xfs_log_ticket_t;
 158
 159 /*
 160  * Structure used to pass callback function and the function's argument
 161  * to the log manager.
 162  */
 163 typedef struct xfs_log_callback {
 164         struct xfs_log_callback *cb_next;
 165         void                    (*cb_func)(void *, int);
 166         void                    *cb_arg;
 167 } xfs_log_callback_t;
 168
 169
 170 #ifdef __KERNEL__
 171 /* Log manager interfaces */
 172 struct xfs_mount;
 173 xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
 174                        xfs_log_ticket_t ticket,
 175                        void             **iclog,
 176                        uint             flags);
 177 int       xfs_log_force(struct xfs_mount *mp,
 178                         xfs_lsn_t        lsn,
 179                         uint             flags);
 180 int       xfs_log_mount(struct xfs_mount        *mp,
 181                         struct xfs_buftarg      *log_target,
 182                         xfs_daddr_t             start_block,
 183                         int                     num_bblocks);
 184 int       xfs_log_mount_finish(struct xfs_mount *mp, int);
 185 void      xfs_log_move_tail(struct xfs_mount    *mp,
 186                             xfs_lsn_t           tail_lsn);
 187 int       xfs_log_notify(struct xfs_mount       *mp,
 188                          void                   *iclog,
 189                          xfs_log_callback_t     *callback_entry);
 190 int       xfs_log_release_iclog(struct xfs_mount *mp,
 191                          void                    *iclog_hndl);
 192 int       xfs_log_reserve(struct xfs_mount *mp,
 193                           int              length,
 194                           int              count,
 195                           xfs_log_ticket_t *ticket,
 196                           __uint8_t        clientid,
 197                           uint             flags,
 198                           uint             t_type);
 199 int       xfs_log_write(struct xfs_mount *mp,
 200                         xfs_log_iovec_t  region[],
 201                         int              nentries,
 202                         xfs_log_ticket_t ticket,
 203                         xfs_lsn_t        *start_lsn);
 204 int       xfs_log_unmount(struct xfs_mount *mp);
 205 int       xfs_log_unmount_write(struct xfs_mount *mp);
 206 void      xfs_log_unmount_dealloc(struct xfs_mount *mp);
 207 int       xfs_log_force_umount(struct xfs_mount *mp, int logerror);
 208 int       xfs_log_need_covered(struct xfs_mount *mp);
 209
 210 void      xlog_iodone(struct xfs_buf *);
 211
 212 #endif
 213
 214
 215 extern int xlog_debug;          /* set to 1 to enable real log */
 216
 217
 218 #endif  /* __XFS_LOG_H__ */