release/src-rt-6.x.4708/linux/linux-2.6.36/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 #define CYCLE_LSN(lsn) ((uint)((lsn)>>32))
  23 #define BLOCK_LSN(lsn) ((uint)(lsn))
  24
  25 /* this is used in a spot where we might otherwise double-endian-flip */
  26 #define CYCLE_LSN_DISK(lsn) (((__be32 *)&(lsn))[0])
  27
  28 #ifdef __KERNEL__
  29 /*
  30  * By comparing each component, 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_done()
  52  */
  53 #define XFS_LOG_REL_PERM_RESERV 0x1
  54
  55 /*
  56  * Flags to xfs_log_reserve()
  57  *
  58  *      XFS_LOG_PERM_RESERV: Permanent reservation.  When writes are
  59  *              performed against this type of reservation, the reservation
  60  *              is not decreased.  Long running transactions should use this.
  61  */
  62 #define XFS_LOG_PERM_RESERV     0x2
  63
  64 /*
  65  * Flags to xfs_log_force()
  66  *
  67  *      XFS_LOG_SYNC:   Synchronous force in-core log to disk
  68  */
  69 #define XFS_LOG_SYNC            0x1
  70
  71 #endif  /* __KERNEL__ */
  72
  73
  74 /* Log Clients */
  75 #define XFS_TRANSACTION         0x69
  76 #define XFS_VOLUME              0x2
  77 #define XFS_LOG                 0xaa
  78
  79
  80 /* Region types for iovec's i_type */
  81 #define XLOG_REG_TYPE_BFORMAT           1
  82 #define XLOG_REG_TYPE_BCHUNK            2
  83 #define XLOG_REG_TYPE_EFI_FORMAT        3
  84 #define XLOG_REG_TYPE_EFD_FORMAT        4
  85 #define XLOG_REG_TYPE_IFORMAT           5
  86 #define XLOG_REG_TYPE_ICORE             6
  87 #define XLOG_REG_TYPE_IEXT              7
  88 #define XLOG_REG_TYPE_IBROOT            8
  89 #define XLOG_REG_TYPE_ILOCAL            9
  90 #define XLOG_REG_TYPE_IATTR_EXT         10
  91 #define XLOG_REG_TYPE_IATTR_BROOT       11
  92 #define XLOG_REG_TYPE_IATTR_LOCAL       12
  93 #define XLOG_REG_TYPE_QFORMAT           13
  94 #define XLOG_REG_TYPE_DQUOT             14
  95 #define XLOG_REG_TYPE_QUOTAOFF          15
  96 #define XLOG_REG_TYPE_LRHEADER          16
  97 #define XLOG_REG_TYPE_UNMOUNT           17
  98 #define XLOG_REG_TYPE_COMMIT            18
  99 #define XLOG_REG_TYPE_TRANSHDR          19
 100 #define XLOG_REG_TYPE_MAX               19
 101
 102 typedef struct xfs_log_iovec {
 103         void            *i_addr;        /* beginning address of region */
 104         int             i_len;          /* length in bytes of region */
 105         uint            i_type;         /* type of region */
 106 } xfs_log_iovec_t;
 107
 108 struct xfs_log_vec {
 109         struct xfs_log_vec      *lv_next;       /* next lv in build list */
 110         int                     lv_niovecs;     /* number of iovecs in lv */
 111         struct xfs_log_iovec    *lv_iovecp;     /* iovec array */
 112         struct xfs_log_item     *lv_item;       /* owner */
 113         char                    *lv_buf;        /* formatted buffer */
 114         int                     lv_buf_len;     /* size of formatted buffer */
 115 };
 116
 117 /*
 118  * Structure used to pass callback function and the function's argument
 119  * to the log manager.
 120  */
 121 typedef struct xfs_log_callback {
 122         struct xfs_log_callback *cb_next;
 123         void                    (*cb_func)(void *, int);
 124         void                    *cb_arg;
 125 } xfs_log_callback_t;
 126
 127
 128 #ifdef __KERNEL__
 129 /* Log manager interfaces */
 130 struct xfs_mount;
 131 struct xlog_in_core;
 132 struct xlog_ticket;
 133 struct xfs_log_item;
 134 struct xfs_item_ops;
 135 struct xfs_trans;
 136
 137 void    xfs_log_item_init(struct xfs_mount      *mp,
 138                         struct xfs_log_item     *item,
 139                         int                     type,
 140                         struct xfs_item_ops     *ops);
 141
 142 xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
 143                        struct xlog_ticket *ticket,
 144                        struct xlog_in_core **iclog,
 145                        uint             flags);
 146 int       _xfs_log_force(struct xfs_mount *mp,
 147                          uint           flags,
 148                          int            *log_forced);
 149 void      xfs_log_force(struct xfs_mount        *mp,
 150                         uint                    flags);
 151 int       _xfs_log_force_lsn(struct xfs_mount *mp,
 152                              xfs_lsn_t          lsn,
 153                              uint               flags,
 154                              int                *log_forced);
 155 void      xfs_log_force_lsn(struct xfs_mount    *mp,
 156                             xfs_lsn_t           lsn,
 157                             uint                flags);
 158 int       xfs_log_mount(struct xfs_mount        *mp,
 159                         struct xfs_buftarg      *log_target,
 160                         xfs_daddr_t             start_block,
 161                         int                     num_bblocks);
 162 int       xfs_log_mount_finish(struct xfs_mount *mp);
 163 void      xfs_log_move_tail(struct xfs_mount    *mp,
 164                             xfs_lsn_t           tail_lsn);
 165 int       xfs_log_notify(struct xfs_mount       *mp,
 166                          struct xlog_in_core    *iclog,
 167                          xfs_log_callback_t     *callback_entry);
 168 int       xfs_log_release_iclog(struct xfs_mount *mp,
 169                          struct xlog_in_core     *iclog);
 170 int       xfs_log_reserve(struct xfs_mount *mp,
 171                           int              length,
 172                           int              count,
 173                           struct xlog_ticket **ticket,
 174                           __uint8_t        clientid,
 175                           uint             flags,
 176                           uint             t_type);
 177 int       xfs_log_write(struct xfs_mount *mp,
 178                         xfs_log_iovec_t  region[],
 179                         int              nentries,
 180                         struct xlog_ticket *ticket,
 181                         xfs_lsn_t        *start_lsn);
 182 int       xfs_log_unmount_write(struct xfs_mount *mp);
 183 void      xfs_log_unmount(struct xfs_mount *mp);
 184 int       xfs_log_force_umount(struct xfs_mount *mp, int logerror);
 185 int       xfs_log_need_covered(struct xfs_mount *mp);
 186
 187 void      xlog_iodone(struct xfs_buf *);
 188
 189 struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
 190 void      xfs_log_ticket_put(struct xlog_ticket *ticket);
 191
 192 xlog_tid_t xfs_log_get_trans_ident(struct xfs_trans *tp);
 193
 194 int     xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp,
 195                                 struct xfs_log_vec *log_vector,
 196                                 xfs_lsn_t *commit_lsn, int flags);
 197 bool    xfs_log_item_in_current_chkpt(struct xfs_log_item *lip);
 198
 199 #endif
 200 #endif  /* __XFS_LOG_H__ */