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
  26 /* this is used in a spot where we might otherwise double-endian-flip */
  27 #define CYCLE_LSN_DISK(lsn) (((__be32 *)&(lsn))[0])
  28
  29 #ifdef __KERNEL__
  30 /*
  31  * By comparing each component, we don't have to worry about extra
  32  * endian issues in treating two 32 bit numbers as one 64 bit number
  33  */
  34 static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
  35 {
  36         if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
  37                 return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
  38
  39         if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
  40                 return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
  41
  42         return 0;
  43 }
  44
  45 #define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
  46
  47 /*
  48  * Macros, structures, prototypes for interface to the log manager.
  49  */
  50
  51 /*
  52  * Flags to xfs_log_done()
  53  */
  54 #define XFS_LOG_REL_PERM_RESERV 0x1
  55
  56 /*
  57  * Flags to xfs_log_reserve()
  58  *
  59  *      XFS_LOG_SLEEP:   If space is not available, sleep (default)
  60  *      XFS_LOG_NOSLEEP: If space is not available, return error
  61  *      XFS_LOG_PERM_RESERV: Permanent reservation.  When writes are
  62  *              performed against this type of reservation, the reservation
  63  *              is not decreased.  Long running transactions should use this.
  64  */
  65 #define XFS_LOG_SLEEP           0x0
  66 #define XFS_LOG_NOSLEEP         0x1
  67 #define XFS_LOG_PERM_RESERV     0x2
  68
  69 /*
  70  * Flags to xfs_log_force()
  71  *
  72  *      XFS_LOG_SYNC:   Synchronous force in-core log to disk
  73  */
  74 #define XFS_LOG_SYNC            0x1
  75
  76 #endif  /* __KERNEL__ */
  77
  78
  79 /* Log Clients */
  80 #define XFS_TRANSACTION         0x69
  81 #define XFS_VOLUME              0x2
  82 #define XFS_LOG                 0xaa
  83
  84
  85 /* Region types for iovec's i_type */
  86 #define XLOG_REG_TYPE_BFORMAT           1
  87 #define XLOG_REG_TYPE_BCHUNK            2
  88 #define XLOG_REG_TYPE_EFI_FORMAT        3
  89 #define XLOG_REG_TYPE_EFD_FORMAT        4
  90 #define XLOG_REG_TYPE_IFORMAT           5
  91 #define XLOG_REG_TYPE_ICORE             6
  92 #define XLOG_REG_TYPE_IEXT              7
  93 #define XLOG_REG_TYPE_IBROOT            8
  94 #define XLOG_REG_TYPE_ILOCAL            9
  95 #define XLOG_REG_TYPE_IATTR_EXT         10
  96 #define XLOG_REG_TYPE_IATTR_BROOT       11
  97 #define XLOG_REG_TYPE_IATTR_LOCAL       12
  98 #define XLOG_REG_TYPE_QFORMAT           13
  99 #define XLOG_REG_TYPE_DQUOT             14
 100 #define XLOG_REG_TYPE_QUOTAOFF          15
 101 #define XLOG_REG_TYPE_LRHEADER          16
 102 #define XLOG_REG_TYPE_UNMOUNT           17
 103 #define XLOG_REG_TYPE_COMMIT            18
 104 #define XLOG_REG_TYPE_TRANSHDR          19
 105 #define XLOG_REG_TYPE_MAX               19
 106
 107 typedef struct xfs_log_iovec {
 108         xfs_caddr_t     i_addr;         /* beginning address of region */
 109         int             i_len;          /* length in bytes of region */
 110         uint            i_type;         /* type of region */
 111 } xfs_log_iovec_t;
 112
 113 /*
 114  * Structure used to pass callback function and the function's argument
 115  * to the log manager.
 116  */
 117 typedef struct xfs_log_callback {
 118         struct xfs_log_callback *cb_next;
 119         void                    (*cb_func)(void *, int);
 120         void                    *cb_arg;
 121 } xfs_log_callback_t;
 122
 123
 124 #ifdef __KERNEL__
 125 /* Log manager interfaces */
 126 struct xfs_mount;
 127 struct xlog_in_core;
 128 struct xlog_ticket;
 129 struct xfs_log_item;
 130 struct xfs_item_ops;
 131
 132 void    xfs_log_item_init(struct xfs_mount      *mp,
 133                         struct xfs_log_item     *item,
 134                         int                     type,
 135                         struct xfs_item_ops     *ops);
 136
 137 xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
 138                        struct xlog_ticket *ticket,
 139                        struct xlog_in_core **iclog,
 140                        uint             flags);
 141 int       _xfs_log_force(struct xfs_mount *mp,
 142                          uint           flags,
 143                          int            *log_forced);
 144 void      xfs_log_force(struct xfs_mount        *mp,
 145                         uint                    flags);
 146 int       _xfs_log_force_lsn(struct xfs_mount *mp,
 147                              xfs_lsn_t          lsn,
 148                              uint               flags,
 149                              int                *log_forced);
 150 void      xfs_log_force_lsn(struct xfs_mount    *mp,
 151                             xfs_lsn_t           lsn,
 152                             uint                flags);
 153 int       xfs_log_mount(struct xfs_mount        *mp,
 154                         struct xfs_buftarg      *log_target,
 155                         xfs_daddr_t             start_block,
 156                         int                     num_bblocks);
 157 int       xfs_log_mount_finish(struct xfs_mount *mp);
 158 void      xfs_log_move_tail(struct xfs_mount    *mp,
 159                             xfs_lsn_t           tail_lsn);
 160 int       xfs_log_notify(struct xfs_mount       *mp,
 161                          struct xlog_in_core    *iclog,
 162                          xfs_log_callback_t     *callback_entry);
 163 int       xfs_log_release_iclog(struct xfs_mount *mp,
 164                          struct xlog_in_core     *iclog);
 165 int       xfs_log_reserve(struct xfs_mount *mp,
 166                           int              length,
 167                           int              count,
 168                           struct xlog_ticket **ticket,
 169                           __uint8_t        clientid,
 170                           uint             flags,
 171                           uint             t_type);
 172 int       xfs_log_write(struct xfs_mount *mp,
 173                         xfs_log_iovec_t  region[],
 174                         int              nentries,
 175                         struct xlog_ticket *ticket,
 176                         xfs_lsn_t        *start_lsn);
 177 int       xfs_log_unmount_write(struct xfs_mount *mp);
 178 void      xfs_log_unmount(struct xfs_mount *mp);
 179 int       xfs_log_force_umount(struct xfs_mount *mp, int logerror);
 180 int       xfs_log_need_covered(struct xfs_mount *mp);
 181
 182 void      xlog_iodone(struct xfs_buf *);
 183
 184 struct xlog_ticket * xfs_log_ticket_get(struct xlog_ticket *ticket);
 185 void      xfs_log_ticket_put(struct xlog_ticket *ticket);
 186
 187 #endif
 188
 189
 190 extern int xlog_debug;          /* set to 1 to enable real log */
 191
 192
 193 #endif  /* __XFS_LOG_H__ */