fs/xfs/xfs_trans_priv.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_TRANS_PRIV_H__
   7 #define __XFS_TRANS_PRIV_H__
   8
   9 struct xfs_log_item;
  10 struct xfs_mount;
  11 struct xfs_trans;
  12 struct xfs_ail;
  13 struct xfs_log_vec;
  14
  15
  16 void    xfs_trans_init(struct xfs_mount *);
  17 void    xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
  18 void    xfs_trans_del_item(struct xfs_log_item *);
  19 void    xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
  20
  21 void    xfs_trans_committed_bulk(struct xfs_ail *ailp, struct xfs_log_vec *lv,
  22                                 xfs_lsn_t commit_lsn, bool aborted);
  23 /*
  24  * AIL traversal cursor.
  25  *
  26  * Rather than using a generation number for detecting changes in the ail, use
  27  * a cursor that is protected by the ail lock. The aild cursor exists in the
  28  * struct xfs_ail, but other traversals can declare it on the stack and link it
  29  * to the ail list.
  30  *
  31  * When an object is deleted from or moved int the AIL, the cursor list is
  32  * searched to see if the object is a designated cursor item. If it is, it is
  33  * deleted from the cursor so that the next time the cursor is used traversal
  34  * will return to the start.
  35  *
  36  * This means a traversal colliding with a removal will cause a restart of the
  37  * list scan, rather than any insertion or deletion anywhere in the list. The
  38  * low bit of the item pointer is set if the cursor has been invalidated so
  39  * that we can tell the difference between invalidation and reaching the end
  40  * of the list to trigger traversal restarts.
  41  */
  42 struct xfs_ail_cursor {
  43         struct list_head        list;
  44         struct xfs_log_item     *item;
  45 };
  46
  47 /*
  48  * Private AIL structures.
  49  *
  50  * Eventually we need to drive the locking in here as well.
  51  */
  52 struct xfs_ail {
  53         struct xfs_mount        *ail_mount;
  54         struct task_struct      *ail_task;
  55         struct list_head        ail_head;
  56         xfs_lsn_t               ail_target;
  57         xfs_lsn_t               ail_target_prev;
  58         struct list_head        ail_cursors;
  59         spinlock_t              ail_lock;
  60         xfs_lsn_t               ail_last_pushed_lsn;
  61         int                     ail_log_flush;
  62         struct list_head        ail_buf_list;
  63         wait_queue_head_t       ail_empty;
  64 };
  65
  66 /*
  67  * From xfs_trans_ail.c
  68  */
  69 void    xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
  70                                 struct xfs_ail_cursor *cur,
  71                                 struct xfs_log_item **log_items, int nr_items,
  72                                 xfs_lsn_t lsn) __releases(ailp->ail_lock);
  73 /*
  74  * Return a pointer to the first item in the AIL.  If the AIL is empty, then
  75  * return NULL.
  76  */
  77 static inline struct xfs_log_item *
  78 xfs_ail_min(
  79         struct xfs_ail  *ailp)
  80 {
  81         return list_first_entry_or_null(&ailp->ail_head, struct xfs_log_item,
  82                                         li_ail);
  83 }
  84
  85 static inline void
  86 xfs_trans_ail_update(
  87         struct xfs_ail          *ailp,
  88         struct xfs_log_item     *lip,
  89         xfs_lsn_t               lsn) __releases(ailp->ail_lock)
  90 {
  91         xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn);
  92 }
  93
  94 void xfs_trans_ail_insert(struct xfs_ail *ailp, struct xfs_log_item *lip,
  95                 xfs_lsn_t lsn);
  96
  97 xfs_lsn_t xfs_ail_delete_one(struct xfs_ail *ailp, struct xfs_log_item *lip);
  98 void xfs_ail_update_finish(struct xfs_ail *ailp, xfs_lsn_t old_lsn)
  99                         __releases(ailp->ail_lock);
 100 void xfs_trans_ail_delete(struct xfs_log_item *lip, int shutdown_type);
 101
 102 void                    xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
 103 void                    xfs_ail_push_all(struct xfs_ail *);
 104 void                    xfs_ail_push_all_sync(struct xfs_ail *);
 105 struct xfs_log_item     *xfs_ail_min(struct xfs_ail  *ailp);
 106 xfs_lsn_t               xfs_ail_min_lsn(struct xfs_ail *ailp);
 107
 108 struct xfs_log_item *   xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
 109                                         struct xfs_ail_cursor *cur,
 110                                         xfs_lsn_t lsn);
 111 struct xfs_log_item *   xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
 112                                         struct xfs_ail_cursor *cur,
 113                                         xfs_lsn_t lsn);
 114 struct xfs_log_item *   xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
 115                                         struct xfs_ail_cursor *cur);
 116 void                    xfs_trans_ail_cursor_done(struct xfs_ail_cursor *cur);
 117
 118 #if BITS_PER_LONG != 64
 119 static inline void
 120 xfs_trans_ail_copy_lsn(
 121         struct xfs_ail  *ailp,
 122         xfs_lsn_t       *dst,
 123         xfs_lsn_t       *src)
 124 {
 125         ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */
 126         spin_lock(&ailp->ail_lock);
 127         *dst = *src;
 128         spin_unlock(&ailp->ail_lock);
 129 }
 130 #else
 131 static inline void
 132 xfs_trans_ail_copy_lsn(
 133         struct xfs_ail  *ailp,
 134         xfs_lsn_t       *dst,
 135         xfs_lsn_t       *src)
 136 {
 137         ASSERT(sizeof(xfs_lsn_t) == 8);
 138         *dst = *src;
 139 }
 140 #endif
 141
 142 static inline void
 143 xfs_clear_li_failed(
 144         struct xfs_log_item     *lip)
 145 {
 146         struct xfs_buf  *bp = lip->li_buf;
 147
 148         ASSERT(test_bit(XFS_LI_IN_AIL, &lip->li_flags));
 149         lockdep_assert_held(&lip->li_ailp->ail_lock);
 150
 151         if (test_and_clear_bit(XFS_LI_FAILED, &lip->li_flags)) {
 152                 lip->li_buf = NULL;
 153                 xfs_buf_rele(bp);
 154         }
 155 }
 156
 157 static inline void
 158 xfs_set_li_failed(
 159         struct xfs_log_item     *lip,
 160         struct xfs_buf          *bp)
 161 {
 162         lockdep_assert_held(&lip->li_ailp->ail_lock);
 163
 164         if (!test_and_set_bit(XFS_LI_FAILED, &lip->li_flags)) {
 165                 xfs_buf_hold(bp);
 166                 lip->li_buf = bp;
 167         }
 168 }
 169
 170 #endif  /* __XFS_TRANS_PRIV_H__ */