root/fs/xfs/xfs_log.h

INCLUDED FROM

DEFINITIONS

1. xlog_prepare_iovec
2. xlog_finish_iovec
3. xlog_copy_iovec
4. _lsn_cmp

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_LOG_H__
   7 #define __XFS_LOG_H__
   8 
   9 struct xfs_cil_ctx;
  10 
  11 struct xfs_log_vec {
  12         struct xfs_log_vec      *lv_next;       /* next lv in build list */
  13         int                     lv_niovecs;     /* number of iovecs in lv */
  14         struct xfs_log_iovec    *lv_iovecp;     /* iovec array */
  15         struct xfs_log_item     *lv_item;       /* owner */
  16         char                    *lv_buf;        /* formatted buffer */
  17         int                     lv_bytes;       /* accounted space in buffer */
  18         int                     lv_buf_len;     /* aligned size of buffer */
  19         int                     lv_size;        /* size of allocated lv */
  20 };
  21 
  22 #define XFS_LOG_VEC_ORDERED     (-1)
  23 
  24 static inline void *
  25 xlog_prepare_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp,
  26                 uint type)
  27 {
  28         struct xfs_log_iovec *vec = *vecp;
  29 
  30         if (vec) {
  31                 ASSERT(vec - lv->lv_iovecp < lv->lv_niovecs);
  32                 vec++;
  33         } else {
  34                 vec = &lv->lv_iovecp[0];
  35         }
  36 
  37         vec->i_type = type;
  38         vec->i_addr = lv->lv_buf + lv->lv_buf_len;
  39 
  40         ASSERT(IS_ALIGNED((unsigned long)vec->i_addr, sizeof(uint64_t)));
  41 
  42         *vecp = vec;
  43         return vec->i_addr;
  44 }
  45 
  46 /*
  47  * We need to make sure the next buffer is naturally aligned for the biggest
  48  * basic data type we put into it.  We already accounted for this padding when
  49  * sizing the buffer.
  50  *
  51  * However, this padding does not get written into the log, and hence we have to
  52  * track the space used by the log vectors separately to prevent log space hangs
  53  * due to inaccurate accounting (i.e. a leak) of the used log space through the
  54  * CIL context ticket.
  55  */
  56 static inline void
  57 xlog_finish_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec *vec, int len)
  58 {
  59         lv->lv_buf_len += round_up(len, sizeof(uint64_t));
  60         lv->lv_bytes += len;
  61         vec->i_len = len;
  62 }
  63 
  64 static inline void *
  65 xlog_copy_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp,
  66                 uint type, void *data, int len)
  67 {
  68         void *buf;
  69 
  70         buf = xlog_prepare_iovec(lv, vecp, type);
  71         memcpy(buf, data, len);
  72         xlog_finish_iovec(lv, *vecp, len);
  73         return buf;
  74 }
  75 
  76 /*
  77  * By comparing each component, we don't have to worry about extra
  78  * endian issues in treating two 32 bit numbers as one 64 bit number
  79  */
  80 static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
  81 {
  82         if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
  83                 return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
  84 
  85         if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
  86                 return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
  87 
  88         return 0;
  89 }
  90 
  91 #define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
  92 
  93 /*
  94  * Flags to xfs_log_force()
  95  *
  96  *      XFS_LOG_SYNC:   Synchronous force in-core log to disk
  97  */
  98 #define XFS_LOG_SYNC            0x1
  99 
 100 /* Log manager interfaces */
 101 struct xfs_mount;
 102 struct xlog_in_core;
 103 struct xlog_ticket;
 104 struct xfs_log_item;
 105 struct xfs_item_ops;
 106 struct xfs_trans;
 107 
 108 xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
 109                        struct xlog_ticket *ticket,
 110                        struct xlog_in_core **iclog,
 111                        bool regrant);
 112 int       xfs_log_force(struct xfs_mount *mp, uint flags);
 113 int       xfs_log_force_lsn(struct xfs_mount *mp, xfs_lsn_t lsn, uint flags,
 114                 int *log_forced);
 115 int       xfs_log_mount(struct xfs_mount        *mp,
 116                         struct xfs_buftarg      *log_target,
 117                         xfs_daddr_t             start_block,
 118                         int                     num_bblocks);
 119 int       xfs_log_mount_finish(struct xfs_mount *mp);
 120 void    xfs_log_mount_cancel(struct xfs_mount *);
 121 xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
 122 xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp);
 123 void      xfs_log_space_wake(struct xfs_mount *mp);
 124 int       xfs_log_release_iclog(struct xfs_mount *mp,
 125                          struct xlog_in_core     *iclog);
 126 int       xfs_log_reserve(struct xfs_mount *mp,
 127                           int              length,
 128                           int              count,
 129                           struct xlog_ticket **ticket,
 130                           uint8_t                  clientid,
 131                           bool             permanent);
 132 int       xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
 133 void      xfs_log_unmount(struct xfs_mount *mp);
 134 int       xfs_log_force_umount(struct xfs_mount *mp, int logerror);
 135 
 136 struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
 137 void      xfs_log_ticket_put(struct xlog_ticket *ticket);
 138 
 139 void    xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp,
 140                                 xfs_lsn_t *commit_lsn, bool regrant);
 141 void    xlog_cil_process_committed(struct list_head *list, bool aborted);
 142 bool    xfs_log_item_in_current_chkpt(struct xfs_log_item *lip);
 143 
 144 void    xfs_log_work_queue(struct xfs_mount *mp);
 145 void    xfs_log_quiesce(struct xfs_mount *mp);
 146 bool    xfs_log_check_lsn(struct xfs_mount *, xfs_lsn_t);
 147 bool    xfs_log_in_recovery(struct xfs_mount *);
 148 
 149 #endif  /* __XFS_LOG_H__ */