kernel/fs/zfs/bplist.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright (c) 2012 by Delphix. All rights reserved.
  24  */
  25
  26 #include <sys/bplist.h>
  27 #include <sys/zfs_context.h>
  28
  29
  30 void
  31 bplist_create(bplist_t *bpl)
  32 {
  33         mutex_init(&bpl->bpl_lock, NULL, MUTEX_DEFAULT, NULL);
  34         list_create(&bpl->bpl_list, sizeof (bplist_entry_t),
  35             offsetof(bplist_entry_t, bpe_node));
  36 }
  37
  38 void
  39 bplist_destroy(bplist_t *bpl)
  40 {
  41         list_destroy(&bpl->bpl_list);
  42         mutex_destroy(&bpl->bpl_lock);
  43 }
  44
  45 void
  46 bplist_append(bplist_t *bpl, const blkptr_t *bp)
  47 {
  48         bplist_entry_t *bpe = kmem_alloc(sizeof (*bpe), KM_SLEEP);
  49
  50         mutex_enter(&bpl->bpl_lock);
  51         bpe->bpe_blk = *bp;
  52         list_insert_tail(&bpl->bpl_list, bpe);
  53         mutex_exit(&bpl->bpl_lock);
  54 }
  55
  56 /*
  57  * To aid debugging, we keep the most recently removed entry.  This way if
  58  * we are in the callback, we can easily locate the entry.
  59  */
  60 static bplist_entry_t *bplist_iterate_last_removed;
  61
  62 void
  63 bplist_iterate(bplist_t *bpl, bplist_itor_t *func, void *arg, dmu_tx_t *tx)
  64 {
  65         bplist_entry_t *bpe;
  66
  67         mutex_enter(&bpl->bpl_lock);
  68         while (bpe = list_head(&bpl->bpl_list)) {
  69                 bplist_iterate_last_removed = bpe;
  70                 list_remove(&bpl->bpl_list, bpe);
  71                 mutex_exit(&bpl->bpl_lock);
  72                 func(arg, &bpe->bpe_blk, tx);
  73                 kmem_free(bpe, sizeof (*bpe));
  74                 mutex_enter(&bpl->bpl_lock);
  75         }
  76         mutex_exit(&bpl->bpl_lock);
  77 }