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Fix zpool history unbounded memory usage

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In original implementation, zpool history will read the whole history
before printing anything, causing memory usage goes unbounded. We fix
this by breaking it into read-print iterations.

Reviewed-by: Tom Caputi <tcaputi@datto.com>
Reviewed-by: Matt Ahrens <matt@delphix.com>
Reviewed-by: Igor Kozhukhov <igor@dilos.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chunwei Chen <david.chen@nutanix.com>
Closes #9516
This commit is contained in:
Chunwei Chen
2019-10-28 09:49:44 -07:00
committed by Brian Behlendorf
parent e35704647e
commit 7125a109dc
3 changed files with 41 additions and 26 deletions
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cmd/zpool/zpool_main.c
+28 -16
View File
@@ -8518,24 +8518,12 @@ typedef struct hist_cbdata {
boolean_t internal;
} hist_cbdata_t;
/*
* Print out the command history for a specific pool.
*/
static int
get_history_one(zpool_handle_t *zhp, void *data)
static void
print_history_records(nvlist_t *nvhis, hist_cbdata_t *cb)
{
nvlist_t *nvhis;
nvlist_t **records;
uint_t numrecords;
int ret, i;
hist_cbdata_t *cb = (hist_cbdata_t *)data;
cb->first = B_FALSE;
(void) printf(gettext("History for '%s':\n"), zpool_get_name(zhp));
if ((ret = zpool_get_history(zhp, &nvhis)) != 0)
return (ret);
int i;
verify(nvlist_lookup_nvlist_array(nvhis, ZPOOL_HIST_RECORD,
&records, &numrecords) == 0);
@@ -8639,8 +8627,32 @@ get_history_one(zpool_handle_t *zhp, void *data)
(void) printf("]");
(void) printf("\n");
}
}
/*
* Print out the command history for a specific pool.
*/
static int
get_history_one(zpool_handle_t *zhp, void *data)
{
nvlist_t *nvhis;
int ret;
hist_cbdata_t *cb = (hist_cbdata_t *)data;
uint64_t off = 0;
boolean_t eof = B_FALSE;
cb->first = B_FALSE;
(void) printf(gettext("History for '%s':\n"), zpool_get_name(zhp));
while (!eof) {
if ((ret = zpool_get_history(zhp, &nvhis, &off, &eof)) != 0)
return (ret);
print_history_records(nvhis, cb);
nvlist_free(nvhis);
}
(void) printf("\n");
nvlist_free(nvhis);
return (ret);
}