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Illumos #883: ZIL reuse during remount corruption

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Moving the zil_free() cleanup to zil_close() prevents this
problem from occurring in the first place.  There is a very
good description of the issue and fix in Illumus #883.

Reviewed by: Matt Ahrens <Matt.Ahrens@delphix.com>
Reviewed by: Adam Leventhal <Adam.Leventhal@delphix.com>
Reviewed by: Albert Lee <trisk@nexenta.com>
Reviewed by: Gordon Ross <gwr@nexenta.com>
Reviewed by: Garrett D'Amore <garrett@nexenta.com>
Reivewed by: Dan McDonald <danmcd@nexenta.com>
Approved by: Gordon Ross <gwr@nexenta.com>

References to Illumos issue and patch:
- https://www.illumos.org/issues/883
- https://github.com/illumos/illumos-gate/commit/c9ba2a43cb

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #340
This commit is contained in:
Eric Schrock
2011-07-26 12:41:53 -07:00
committed by Brian Behlendorf
parent f5fc4acaa7
commit 3e31d2b080
2 changed files with 60 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/zil.c
+24 -16
View File
@@ -20,6 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011 by Delphix. All rights reserved.
*/
/* Portions Copyright 2010 Robert Milkowski */
@@ -562,7 +563,7 @@ zil_destroy(zilog_t *zilog, boolean_t keep_first)
if (!list_is_empty(&zilog->zl_lwb_list)) {
ASSERT(zh->zh_claim_txg == 0);
ASSERT(!keep_first);
VERIFY(!keep_first);
while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) {
list_remove(&zilog->zl_lwb_list, lwb);
if (lwb->lwb_buf != NULL)
@@ -1665,21 +1666,11 @@ zil_alloc(objset_t *os, zil_header_t *zh_phys)
void
zil_free(zilog_t *zilog)
{
lwb_t *head_lwb;
int i;
zilog->zl_stop_sync = 1;
/*
* After zil_close() there should only be one lwb with a buffer.
*/
head_lwb = list_head(&zilog->zl_lwb_list);
if (head_lwb) {
ASSERT(head_lwb == list_tail(&zilog->zl_lwb_list));
list_remove(&zilog->zl_lwb_list, head_lwb);
zio_buf_free(head_lwb->lwb_buf, head_lwb->lwb_sz);
kmem_cache_free(zil_lwb_cache, head_lwb);
}
ASSERT(list_is_empty(&zilog->zl_lwb_list));
list_destroy(&zilog->zl_lwb_list);
avl_destroy(&zilog->zl_vdev_tree);
@@ -1719,6 +1710,10 @@ zil_open(objset_t *os, zil_get_data_t *get_data)
{
zilog_t *zilog = dmu_objset_zil(os);
ASSERT(zilog->zl_clean_taskq == NULL);
ASSERT(zilog->zl_get_data == NULL);
ASSERT(list_is_empty(&zilog->zl_lwb_list));
zilog->zl_get_data = get_data;
zilog->zl_clean_taskq = taskq_create("zil_clean", 1, minclsyspri,
2, 2, TASKQ_PREPOPULATE);
@@ -1732,7 +1727,7 @@ zil_open(objset_t *os, zil_get_data_t *get_data)
void
zil_close(zilog_t *zilog)
{
lwb_t *tail_lwb;
lwb_t *lwb;
uint64_t txg = 0;
zil_commit(zilog, 0); /* commit all itx */
@@ -1744,9 +1739,9 @@ zil_close(zilog_t *zilog)
* destroy the zl_clean_taskq.
*/
mutex_enter(&zilog->zl_lock);
tail_lwb = list_tail(&zilog->zl_lwb_list);
if (tail_lwb != NULL)
txg = tail_lwb->lwb_max_txg;
lwb = list_tail(&zilog->zl_lwb_list);
if (lwb != NULL)
txg = lwb->lwb_max_txg;
mutex_exit(&zilog->zl_lock);
if (txg)
txg_wait_synced(zilog->zl_dmu_pool, txg);
@@ -1754,6 +1749,19 @@ zil_close(zilog_t *zilog)
taskq_destroy(zilog->zl_clean_taskq);
zilog->zl_clean_taskq = NULL;
zilog->zl_get_data = NULL;
/*
* We should have only one LWB left on the list; remove it now.
*/
mutex_enter(&zilog->zl_lock);
lwb = list_head(&zilog->zl_lwb_list);
if (lwb != NULL) {
ASSERT(lwb == list_tail(&zilog->zl_lwb_list));
list_remove(&zilog->zl_lwb_list, lwb);
zio_buf_free(lwb->lwb_buf, lwb->lwb_sz);
kmem_cache_free(zil_lwb_cache, lwb);
}
mutex_exit(&zilog->zl_lock);
}
/*