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
  34 #if defined(__GNUC__) && (__GNUC__ == 2) && ( (__GNUC_MINOR__ == 95) || (__GNUC_MINOR__ == 96))
  35 __attribute__((unused)) /* gcc 2.95, 2.96 miscompile this when inlined */
  36 #else
  37 __inline__
  38 #endif
  39 xfs_lsn_t       _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
  40 {
  41         if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
  42                 return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
  43
  44         if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
  45                 return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
  46
  47         return 0;
  48 }
  49
  50 #define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
  51
  52 /*
  53  * Macros, structures, prototypes for interface to the log manager.
  54  */
  55
  56 /*
  57  * Flags to xfs_log_mount
  58  */
  59 #define XFS_LOG_RECOVER         0x1
  60
  61 /*
  62  * Flags to xfs_log_done()
  63  */
  64 #define XFS_LOG_REL_PERM_RESERV 0x1
  65
  66
  67 /*
  68  * Flags to xfs_log_reserve()
  69  *
  70  *      XFS_LOG_SLEEP:   If space is not available, sleep (default)
  71  *      XFS_LOG_NOSLEEP: If space is not available, return error
  72  *      XFS_LOG_PERM_RESERV: Permanent reservation.  When writes are
  73  *              performed against this type of reservation, the reservation
  74  *              is not decreased.  Long running transactions should use this.
  75  */
  76 #define XFS_LOG_SLEEP           0x0
  77 #define XFS_LOG_NOSLEEP         0x1
  78 #define XFS_LOG_PERM_RESERV     0x2
  79 #define XFS_LOG_RESV_ALL        (XFS_LOG_NOSLEEP|XFS_LOG_PERM_RESERV)
  80
  81
  82 /*
  83  * Flags to xfs_log_force()
  84  *
  85  *      XFS_LOG_SYNC:   Synchronous force in-core log to disk
  86  *      XFS_LOG_FORCE:  Start in-core log write now.
  87  *      XFS_LOG_URGE:   Start write within some window of time.
  88  *
  89  * Note: Either XFS_LOG_FORCE or XFS_LOG_URGE must be set.
  90  */
  91 #define XFS_LOG_SYNC            0x1
  92 #define XFS_LOG_FORCE           0x2
  93 #define XFS_LOG_URGE            0x4
  94
  95 #endif  /* __KERNEL__ */
  96
  97
  98 /* Log Clients */
  99 #define XFS_TRANSACTION         0x69
 100 #define XFS_VOLUME              0x2
 101 #define XFS_LOG                 0xaa
 102
 103
 104 /* Region types for iovec's i_type */
 105 #if defined(XFS_LOG_RES_DEBUG)
 106 #define XLOG_REG_TYPE_BFORMAT           1
 107 #define XLOG_REG_TYPE_BCHUNK            2
 108 #define XLOG_REG_TYPE_EFI_FORMAT        3
 109 #define XLOG_REG_TYPE_EFD_FORMAT        4
 110 #define XLOG_REG_TYPE_IFORMAT           5
 111 #define XLOG_REG_TYPE_ICORE             6
 112 #define XLOG_REG_TYPE_IEXT              7
 113 #define XLOG_REG_TYPE_IBROOT            8
 114 #define XLOG_REG_TYPE_ILOCAL            9
 115 #define XLOG_REG_TYPE_IATTR_EXT         10
 116 #define XLOG_REG_TYPE_IATTR_BROOT       11
 117 #define XLOG_REG_TYPE_IATTR_LOCAL       12
 118 #define XLOG_REG_TYPE_QFORMAT           13
 119 #define XLOG_REG_TYPE_DQUOT             14
 120 #define XLOG_REG_TYPE_QUOTAOFF          15
 121 #define XLOG_REG_TYPE_LRHEADER          16
 122 #define XLOG_REG_TYPE_UNMOUNT           17
 123 #define XLOG_REG_TYPE_COMMIT            18
 124 #define XLOG_REG_TYPE_TRANSHDR          19
 125 #define XLOG_REG_TYPE_MAX               19
 126 #endif
 127
 128 #if defined(XFS_LOG_RES_DEBUG)
 129 #define XLOG_VEC_SET_TYPE(vecp, t) ((vecp)->i_type = (t))
 130 #else
 131 #define XLOG_VEC_SET_TYPE(vecp, t)
 132 #endif
 133
 134
 135 typedef struct xfs_log_iovec {
 136         xfs_caddr_t             i_addr;         /* beginning address of region */
 137         int             i_len;          /* length in bytes of region */
 138 #if defined(XFS_LOG_RES_DEBUG)
 139         uint            i_type;         /* type of region */
 140 #endif
 141 } xfs_log_iovec_t;
 142
 143 typedef void* xfs_log_ticket_t;
 144
 145 /*
 146  * Structure used to pass callback function and the function's argument
 147  * to the log manager.
 148  */
 149 typedef struct xfs_log_callback {
 150         struct xfs_log_callback *cb_next;
 151         void                    (*cb_func)(void *, int);
 152         void                    *cb_arg;
 153 } xfs_log_callback_t;
 154
 155
 156 #ifdef __KERNEL__
 157 /* Log manager interfaces */
 158 struct xfs_mount;
 159 xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
 160                        xfs_log_ticket_t ticket,
 161                        void             **iclog,
 162                        uint             flags);
 163 int       _xfs_log_force(struct xfs_mount *mp,
 164                          xfs_lsn_t      lsn,
 165                          uint           flags,
 166                          int            *log_forced);
 167 #define xfs_log_force(mp, lsn, flags) \
 168         _xfs_log_force(mp, lsn, flags, NULL);
 169 int       xfs_log_mount(struct xfs_mount        *mp,
 170                         struct xfs_buftarg      *log_target,
 171                         xfs_daddr_t             start_block,
 172                         int                     num_bblocks);
 173 int       xfs_log_mount_finish(struct xfs_mount *mp, int);
 174 void      xfs_log_move_tail(struct xfs_mount    *mp,
 175                             xfs_lsn_t           tail_lsn);
 176 int       xfs_log_notify(struct xfs_mount       *mp,
 177                          void                   *iclog,
 178                          xfs_log_callback_t     *callback_entry);
 179 int       xfs_log_release_iclog(struct xfs_mount *mp,
 180                          void                    *iclog_hndl);
 181 int       xfs_log_reserve(struct xfs_mount *mp,
 182                           int              length,
 183                           int              count,
 184                           xfs_log_ticket_t *ticket,
 185                           __uint8_t        clientid,
 186                           uint             flags,
 187                           uint             t_type);
 188 int       xfs_log_write(struct xfs_mount *mp,
 189                         xfs_log_iovec_t  region[],
 190                         int              nentries,
 191                         xfs_log_ticket_t ticket,
 192                         xfs_lsn_t        *start_lsn);
 193 int       xfs_log_unmount(struct xfs_mount *mp);
 194 int       xfs_log_unmount_write(struct xfs_mount *mp);
 195 void      xfs_log_unmount_dealloc(struct xfs_mount *mp);
 196 int       xfs_log_force_umount(struct xfs_mount *mp, int logerror);
 197 int       xfs_log_need_covered(struct xfs_mount *mp);
 198
 199 void      xlog_iodone(struct xfs_buf *);
 200
 201 #endif
 202
 203
 204 extern int xlog_debug;          /* set to 1 to enable real log */
 205
 206
 207 #endif  /* __XFS_LOG_H__ */