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 struct xfs_log_vec {
  22         struct xfs_log_vec      *lv_next;       /* next lv in build list */
  23         int                     lv_niovecs;     /* number of iovecs in lv */
  24         struct xfs_log_iovec    *lv_iovecp;     /* iovec array */
  25         struct xfs_log_item     *lv_item;       /* owner */
  26         char                    *lv_buf;        /* formatted buffer */
  27         int                     lv_bytes;       /* accounted space in buffer */
  28         int                     lv_buf_len;     /* aligned size of buffer */
  29         int                     lv_size;        /* size of allocated lv */
  30 };
  31
  32 #define XFS_LOG_VEC_ORDERED     (-1)
  33
  34 static inline void *
  35 xlog_prepare_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp,
  36                 uint type)
  37 {
  38         struct xfs_log_iovec *vec = *vecp;
  39
  40         if (vec) {
  41                 ASSERT(vec - lv->lv_iovecp < lv->lv_niovecs);
  42                 vec++;
  43         } else {
  44                 vec = &lv->lv_iovecp[0];
  45         }
  46
  47         vec->i_type = type;
  48         vec->i_addr = lv->lv_buf + lv->lv_buf_len;
  49
  50         ASSERT(IS_ALIGNED((unsigned long)vec->i_addr, sizeof(uint64_t)));
  51
  52         *vecp = vec;
  53         return vec->i_addr;
  54 }
  55
  56 /*
  57  * We need to make sure the next buffer is naturally aligned for the biggest
  58  * basic data type we put into it.  We already accounted for this padding when
  59  * sizing the buffer.
  60  *
  61  * However, this padding does not get written into the log, and hence we have to
  62  * track the space used by the log vectors separately to prevent log space hangs
  63  * due to inaccurate accounting (i.e. a leak) of the used log space through the
  64  * CIL context ticket.
  65  */
  66 static inline void
  67 xlog_finish_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec *vec, int len)
  68 {
  69         lv->lv_buf_len += round_up(len, sizeof(uint64_t));
  70         lv->lv_bytes += len;
  71         vec->i_len = len;
  72 }
  73
  74 static inline void *
  75 xlog_copy_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp,
  76                 uint type, void *data, int len)
  77 {
  78         void *buf;
  79
  80         buf = xlog_prepare_iovec(lv, vecp, type);
  81         memcpy(buf, data, len);
  82         xlog_finish_iovec(lv, *vecp, len);
  83         return buf;
  84 }
  85
  86 /*
  87  * Structure used to pass callback function and the function's argument
  88  * to the log manager.
  89  */
  90 typedef struct xfs_log_callback {
  91         struct xfs_log_callback *cb_next;
  92         void                    (*cb_func)(void *, int);
  93         void                    *cb_arg;
  94 } xfs_log_callback_t;
  95
  96 /*
  97  * By comparing each component, we don't have to worry about extra
  98  * endian issues in treating two 32 bit numbers as one 64 bit number
  99  */
 100 static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
 101 {
 102         if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
 103                 return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
 104
 105         if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
 106                 return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
 107
 108         return 0;
 109 }
 110
 111 #define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
 112
 113 /*
 114  * Flags to xfs_log_force()
 115  *
 116  *      XFS_LOG_SYNC:   Synchronous force in-core log to disk
 117  */
 118 #define XFS_LOG_SYNC            0x1
 119
 120 /* Log manager interfaces */
 121 struct xfs_mount;
 122 struct xlog_in_core;
 123 struct xlog_ticket;
 124 struct xfs_log_item;
 125 struct xfs_item_ops;
 126 struct xfs_trans;
 127 struct xfs_log_callback;
 128
 129 xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
 130                        struct xlog_ticket *ticket,
 131                        struct xlog_in_core **iclog,
 132                        bool regrant);
 133 int       _xfs_log_force(struct xfs_mount *mp,
 134                          uint           flags,
 135                          int            *log_forced);
 136 void      xfs_log_force(struct xfs_mount        *mp,
 137                         uint                    flags);
 138 int       _xfs_log_force_lsn(struct xfs_mount *mp,
 139                              xfs_lsn_t          lsn,
 140                              uint               flags,
 141                              int                *log_forced);
 142 void      xfs_log_force_lsn(struct xfs_mount    *mp,
 143                             xfs_lsn_t           lsn,
 144                             uint                flags);
 145 int       xfs_log_mount(struct xfs_mount        *mp,
 146                         struct xfs_buftarg      *log_target,
 147                         xfs_daddr_t             start_block,
 148                         int                     num_bblocks);
 149 int       xfs_log_mount_finish(struct xfs_mount *mp);
 150 int     xfs_log_mount_cancel(struct xfs_mount *);
 151 xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
 152 xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp);
 153 void      xfs_log_space_wake(struct xfs_mount *mp);
 154 int       xfs_log_notify(struct xfs_mount       *mp,
 155                          struct xlog_in_core    *iclog,
 156                          struct xfs_log_callback *callback_entry);
 157 int       xfs_log_release_iclog(struct xfs_mount *mp,
 158                          struct xlog_in_core     *iclog);
 159 int       xfs_log_reserve(struct xfs_mount *mp,
 160                           int              length,
 161                           int              count,
 162                           struct xlog_ticket **ticket,
 163                           __uint8_t        clientid,
 164                           bool             permanent,
 165                           uint             t_type);
 166 int       xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
 167 int       xfs_log_unmount_write(struct xfs_mount *mp);
 168 void      xfs_log_unmount(struct xfs_mount *mp);
 169 int       xfs_log_force_umount(struct xfs_mount *mp, int logerror);
 170 int       xfs_log_need_covered(struct xfs_mount *mp);
 171
 172 void      xlog_iodone(struct xfs_buf *);
 173
 174 struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
 175 void      xfs_log_ticket_put(struct xlog_ticket *ticket);
 176
 177 void    xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp,
 178                                 xfs_lsn_t *commit_lsn, bool regrant);
 179 bool    xfs_log_item_in_current_chkpt(struct xfs_log_item *lip);
 180
 181 void    xfs_log_work_queue(struct xfs_mount *mp);
 182 void    xfs_log_worker(struct work_struct *work);
 183 void    xfs_log_quiesce(struct xfs_mount *mp);
 184 bool    xfs_log_check_lsn(struct xfs_mount *, xfs_lsn_t);
 185
 186 #endif  /* __XFS_LOG_H__ */