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Report pool suspended due to MMP

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When the pool is suspended, record whether it was due to an I/O error or
due to MMP writes failing to succeed within the required time.

Change spa_suspended from uint8_t to zio_suspend_reason_t to store the
reason.

When userspace queries pool status via spa_tryimport(), report the
reason the pool was suspended in a new key,
ZPOOL_CONFIG_SUSPENDED_REASON.

In libzfs, when interpreting the returned config nvlist, report
suspension due to MMP with a new pool status enum value,
ZPOOL_STATUS_IO_FAILURE_MMP.

In status_callback(), which generates and emits the message when 'zpool
status' is executed, add a case to print an appropriate message for the
new pool status enum value.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Olaf Faaland <faaland1@llnl.gov>
Closes #7296
This commit is contained in:
Olaf Faaland 2018-03-15 10:56:55 -07:00 committed by Tony Hutter
parent c234706270
commit 3eb3a13628
10 changed files with 38 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
cmd/zpool/zpool_main.c
View File

@ -6395,6 +6395,15 @@ status_callback(zpool_handle_t *zhp, void *data)
"to be recovered.\n"));
break;
case ZPOOL_STATUS_IO_FAILURE_MMP:
(void) printf(gettext("status: The pool is suspended because "
"multihost writes failed or were delayed;\n\tanother "
"system could import the pool undetected.\n"));
(void) printf(gettext("action: Make sure the pool's devices "
"are connected, then reboot your system and\n\timport the "
"pool.\n"));
break;
case ZPOOL_STATUS_IO_FAILURE_WAIT:
case ZPOOL_STATUS_IO_FAILURE_CONTINUE:
(void) printf(gettext("status: One or more devices are "

1
include/libzfs.h
View File

@ -331,6 +331,7 @@ typedef enum {
ZPOOL_STATUS_HOSTID_REQUIRED, /* multihost=on and hostid=0 */
ZPOOL_STATUS_IO_FAILURE_WAIT, /* failed I/O, failmode 'wait' */
ZPOOL_STATUS_IO_FAILURE_CONTINUE, /* failed I/O, failmode 'continue' */
ZPOOL_STATUS_IO_FAILURE_MMP, /* failed MMP, failmode not 'panic' */
ZPOOL_STATUS_BAD_LOG, /* cannot read log chain(s) */
ZPOOL_STATUS_ERRATA, /* informational errata available */

1
include/sys/fs/zfs.h
View File

@ -638,6 +638,7 @@ typedef struct zpool_rewind_policy {
#define ZPOOL_CONFIG_RESILVER_TXG "resilver_txg"
#define ZPOOL_CONFIG_COMMENT "comment"
#define ZPOOL_CONFIG_SUSPENDED "suspended" /* not stored on disk */
#define ZPOOL_CONFIG_SUSPENDED_REASON "suspended_reason" /* not stored */
#define ZPOOL_CONFIG_TIMESTAMP "timestamp" /* not stored on disk */
#define ZPOOL_CONFIG_BOOTFS "bootfs" /* not stored on disk */
#define ZPOOL_CONFIG_MISSING_DEVICES "missing_vdevs" /* not stored on disk */

2
include/sys/spa_impl.h
View File

@ -233,7 +233,7 @@ struct spa {
zio_t *spa_suspend_zio_root; /* root of all suspended I/O */
kmutex_t spa_suspend_lock; /* protects suspend_zio_root */
kcondvar_t spa_suspend_cv; /* notification of resume */
uint8_t spa_suspended; /* pool is suspended */
zio_suspend_reason_t spa_suspended; /* pool is suspended */
uint8_t spa_claiming; /* pool is doing zil_claim() */
boolean_t spa_debug; /* debug enabled? */
boolean_t spa_is_root; /* pool is root */

8
include/sys/zio.h
View File

@ -144,6 +144,12 @@ enum zio_checksum {
#define ZIO_FAILURE_MODE_CONTINUE 1
#define ZIO_FAILURE_MODE_PANIC 2
typedef enum zio_suspend_reason {
ZIO_SUSPEND_NONE = 0,
ZIO_SUSPEND_IOERR,
ZIO_SUSPEND_MMP,
} zio_suspend_reason_t;
enum zio_flag {
/*
* Flags inherited by gang, ddt, and vdev children,
@ -577,7 +583,7 @@ extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
extern enum zio_compress zio_compress_select(spa_t *spa,
enum zio_compress child, enum zio_compress parent);
extern void zio_suspend(spa_t *spa, zio_t *zio);
extern void zio_suspend(spa_t *spa, zio_t *zio, zio_suspend_reason_t);
extern int zio_resume(spa_t *spa);
extern void zio_resume_wait(spa_t *spa);

8
lib/libzfs/libzfs_status.c
View File

@ -274,10 +274,16 @@ check_status(nvlist_t *config, boolean_t isimport, zpool_errata_t *erratap)
return (ZPOOL_STATUS_BAD_GUID_SUM);
/*
* Check whether the pool has suspended due to failed I/O.
* Check whether the pool has suspended.
*/
if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_SUSPENDED,
&suspended) == 0) {
uint64_t reason;
if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_SUSPENDED_REASON,
&reason) == 0 && reason == ZIO_SUSPEND_MMP)
return (ZPOOL_STATUS_IO_FAILURE_MMP);
if (suspended == ZIO_FAILURE_MODE_CONTINUE)
return (ZPOOL_STATUS_IO_FAILURE_CONTINUE);
return (ZPOOL_STATUS_IO_FAILURE_WAIT);

2
module/zfs/mmp.c
View File

@ -519,7 +519,7 @@ mmp_thread(spa_t *spa)
"succeeded in over %llus; suspending pool",
spa_name(spa),
NSEC2SEC(start - mmp->mmp_last_write));
zio_suspend(spa, NULL);
zio_suspend(spa, NULL, ZIO_SUSPEND_MMP);
}
if (multihost && !suspended)

8
module/zfs/spa.c
View File

@ -3778,10 +3778,14 @@ spa_get_stats(const char *name, nvlist_t **config,
ZPOOL_CONFIG_ERRCOUNT,
spa_get_errlog_size(spa)) == 0);
if (spa_suspended(spa))
if (spa_suspended(spa)) {
VERIFY(nvlist_add_uint64(*config,
ZPOOL_CONFIG_SUSPENDED,
spa->spa_failmode) == 0);
VERIFY(nvlist_add_uint64(*config,
ZPOOL_CONFIG_SUSPENDED_REASON,
spa->spa_suspended) == 0);
}
spa_add_spares(spa, *config);
spa_add_l2cache(spa, *config);
@ -6969,7 +6973,7 @@ spa_sync(spa_t *spa, uint64_t txg)
if (error == 0)
break;
zio_suspend(spa, NULL);
zio_suspend(spa, NULL, ZIO_SUSPEND_IOERR);
zio_resume_wait(spa);
}
dmu_tx_commit(tx);

2
module/zfs/spa_misc.c
View File

@ -1691,7 +1691,7 @@ spa_get_failmode(spa_t *spa)
boolean_t
spa_suspended(spa_t *spa)
{
return (spa->spa_suspended);
return (spa->spa_suspended != ZIO_SUSPEND_NONE);
}
uint64_t

8
module/zfs/zio.c
View File

@ -1864,7 +1864,7 @@ zio_reexecute(zio_t *pio)
}
void
zio_suspend(spa_t *spa, zio_t *zio)
zio_suspend(spa_t *spa, zio_t *zio, zio_suspend_reason_t reason)
{
if (spa_get_failmode(spa) == ZIO_FAILURE_MODE_PANIC)
fm_panic("Pool '%s' has encountered an uncorrectable I/O "
@ -1883,7 +1883,7 @@ zio_suspend(spa_t *spa, zio_t *zio)
ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE |
ZIO_FLAG_GODFATHER);
spa->spa_suspended = B_TRUE;
spa->spa_suspended = reason;
if (zio != NULL) {
ASSERT(!(zio->io_flags & ZIO_FLAG_GODFATHER));
@ -1906,7 +1906,7 @@ zio_resume(spa_t *spa)
* Reexecute all previously suspended i/o.
*/
mutex_enter(&spa->spa_suspend_lock);
spa->spa_suspended = B_FALSE;
spa->spa_suspended = ZIO_SUSPEND_NONE;
cv_broadcast(&spa->spa_suspend_cv);
pio = spa->spa_suspend_zio_root;
spa->spa_suspend_zio_root = NULL;
@ -3975,7 +3975,7 @@ zio_done(zio_t *zio)
* We'd fail again if we reexecuted now, so suspend
* until conditions improve (e.g. device comes online).
*/
zio_suspend(zio->io_spa, zio);
zio_suspend(zio->io_spa, zio, ZIO_SUSPEND_IOERR);
} else {
/*
* Reexecution is potentially a huge amount of work.