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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
cmd/ztest/ztest.c
+36
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@@ -206,6 +206,7 @@ typedef struct ztest_od {
*/
typedef struct ztest_ds {
objset_t *zd_os;
krwlock_t zd_zilog_lock;
zilog_t *zd_zilog;
uint64_t zd_seq;
ztest_od_t *zd_od; /* debugging aid */
@@ -239,6 +240,7 @@ ztest_func_t ztest_dmu_commit_callbacks;
ztest_func_t ztest_zap;
ztest_func_t ztest_zap_parallel;
ztest_func_t ztest_zil_commit;
ztest_func_t ztest_zil_remount;
ztest_func_t ztest_dmu_read_write_zcopy;
ztest_func_t ztest_dmu_objset_create_destroy;
ztest_func_t ztest_dmu_prealloc;
@@ -274,6 +276,7 @@ ztest_info_t ztest_info[] = {
{ ztest_zap_parallel, 100, &zopt_always },
{ ztest_split_pool, 1, &zopt_always },
{ ztest_zil_commit, 1, &zopt_incessant },
{ ztest_zil_remount, 1, &zopt_sometimes },
{ ztest_dmu_read_write_zcopy, 1, &zopt_often },
{ ztest_dmu_objset_create_destroy, 1, &zopt_often },
{ ztest_dsl_prop_get_set, 1, &zopt_often },
@@ -1007,6 +1010,7 @@ ztest_zd_init(ztest_ds_t *zd, objset_t *os)
dmu_objset_name(os, zd->zd_name);
int l;
rw_init(&zd->zd_zilog_lock, NULL, RW_DEFAULT, NULL);
mutex_init(&zd->zd_dirobj_lock, NULL, MUTEX_DEFAULT, NULL);
for (l = 0; l < ZTEST_OBJECT_LOCKS; l++)
@@ -1022,6 +1026,7 @@ ztest_zd_fini(ztest_ds_t *zd)
int l;
mutex_destroy(&zd->zd_dirobj_lock);
rw_destroy(&zd->zd_zilog_lock);
for (l = 0; l < ZTEST_OBJECT_LOCKS; l++)
ztest_rll_destroy(&zd->zd_object_lock[l]);
@@ -1993,6 +1998,8 @@ ztest_io(ztest_ds_t *zd, uint64_t object, uint64_t offset)
if (ztest_random(2) == 0)
io_type = ZTEST_IO_WRITE_TAG;
(void) rw_enter(&zd->zd_zilog_lock, RW_READER);
switch (io_type) {
case ZTEST_IO_WRITE_TAG:
@@ -2030,6 +2037,8 @@ ztest_io(ztest_ds_t *zd, uint64_t object, uint64_t offset)
break;
}
(void) rw_exit(&zd->zd_zilog_lock);
umem_free(data, blocksize);
}
@@ -2084,6 +2093,8 @@ ztest_zil_commit(ztest_ds_t *zd, uint64_t id)
{
zilog_t *zilog = zd->zd_zilog;
(void) rw_enter(&zd->zd_zilog_lock, RW_READER);
zil_commit(zilog, ztest_random(ZTEST_OBJECTS));
/*
@@ -2095,6 +2106,31 @@ ztest_zil_commit(ztest_ds_t *zd, uint64_t id)
ASSERT(zd->zd_seq <= zilog->zl_commit_lr_seq);
zd->zd_seq = zilog->zl_commit_lr_seq;
mutex_exit(&zilog->zl_lock);
(void) rw_exit(&zd->zd_zilog_lock);
}
/*
* This function is designed to simulate the operations that occur during a
* mount/unmount operation. We hold the dataset across these operations in an
* attempt to expose any implicit assumptions about ZIL management.
*/
/* ARGSUSED */
void
ztest_zil_remount(ztest_ds_t *zd, uint64_t id)
{
objset_t *os = zd->zd_os;
(void) rw_enter(&zd->zd_zilog_lock, RW_WRITER);
/* zfsvfs_teardown() */
zil_close(zd->zd_zilog);
/* zfsvfs_setup() */
VERIFY(zil_open(os, ztest_get_data) == zd->zd_zilog);
zil_replay(os, zd, ztest_replay_vector);
(void) rw_exit(&zd->zd_zilog_lock);
}
/*