LXR linux/fs/xfs/xfs

   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
   9struct xfs_cil_ctx;
  10
  11struct 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
  24static inline void *
  25xlog_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 */
  56static inline void
  57xlog_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
  64static inline void *
  65xlog_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 */
  80static 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 */
 101struct xfs_mount;
 102struct xlog_in_core;
 103struct xlog_ticket;
 104struct xfs_log_item;
 105struct xfs_item_ops;
 106struct xfs_trans;
 107
 108int       xfs_log_force(struct xfs_mount *mp, uint flags);
 109int       xfs_log_force_lsn(struct xfs_mount *mp, xfs_lsn_t lsn, uint flags,
 110                int *log_forced);
 111int       xfs_log_mount(struct xfs_mount        *mp,
 112                        struct xfs_buftarg      *log_target,
 113                        xfs_daddr_t             start_block,
 114                        int                     num_bblocks);
 115int       xfs_log_mount_finish(struct xfs_mount *mp);
 116void    xfs_log_mount_cancel(struct xfs_mount *);
 117xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
 118xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp);
 119void      xfs_log_space_wake(struct xfs_mount *mp);
 120void      xfs_log_release_iclog(struct xlog_in_core *iclog);
 121int       xfs_log_reserve(struct xfs_mount *mp,
 122                          int              length,
 123                          int              count,
 124                          struct xlog_ticket **ticket,
 125                          uint8_t                  clientid,
 126                          bool             permanent);
 127int       xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
 128void      xfs_log_unmount(struct xfs_mount *mp);
 129int       xfs_log_force_umount(struct xfs_mount *mp, int logerror);
 130
 131struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
 132void      xfs_log_ticket_put(struct xlog_ticket *ticket);
 133
 134void    xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp,
 135                                xfs_lsn_t *commit_lsn, bool regrant);
 136void    xlog_cil_process_committed(struct list_head *list);
 137bool    xfs_log_item_in_current_chkpt(struct xfs_log_item *lip);
 138
 139void    xfs_log_work_queue(struct xfs_mount *mp);
 140void    xfs_log_quiesce(struct xfs_mount *mp);
 141bool    xfs_log_check_lsn(struct xfs_mount *, xfs_lsn_t);
 142bool    xfs_log_in_recovery(struct xfs_mount *);
 143
 144xfs_lsn_t xlog_grant_push_threshold(struct xlog *log, int need_bytes);
 145
 146#endif  /* __XFS_LOG_H__ */
 147