#include <sys/zfeature.h>
#include <sys/abd.h>
#include <sys/range_tree.h>
+#include <sys/dbuf.h>
#ifdef _KERNEL
#include <sys/zfs_vfsops.h>
#endif
static void scan_ds_queue_remove(dsl_scan_t *scn, uint64_t dsobj);
static void scan_ds_queue_sync(dsl_scan_t *scn, dmu_tx_t *tx);
static uint64_t dsl_scan_count_data_disks(spa_t *spa);
+static void read_by_block_level(dsl_scan_t *scn, zbookmark_phys_t zb);
extern uint_t zfs_vdev_async_write_active_min_dirty_percent;
static int zfs_scan_blkstats = 0;
*/
static int zfs_free_bpobj_enabled = 1;
+/* Error blocks to be scrubbed in one txg. */
+unsigned long zfs_scrub_error_blocks_per_txg = 1 << 12;
+
/* the order has to match pool_scan_type */
static scan_cb_t *scan_funcs[POOL_SCAN_FUNCS] = {
NULL,
"scrub_queue", sizeof (uint64_t), 1,
&scn->scn_phys.scn_queue_obj);
} else {
+ err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
+ DMU_POOL_ERRORSCRUB, sizeof (uint64_t),
+ ERRORSCRUB_PHYS_NUMINTS, &scn->errorscrub_phys);
+
+ if (err != 0 && err != ENOENT)
+ return (err);
+
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS,
&scn->scn_phys);
+
/*
* Detect if the pool contains the signature of #2094. If it
* does properly update the scn->scn_phys structure and notify
scn_phys->scn_func == POOL_SCAN_SCRUB);
}
+boolean_t
+dsl_errorscrubbing(const dsl_pool_t *dp)
+{
+ dsl_errorscrub_phys_t *errorscrub_phys = &dp->dp_scan->errorscrub_phys;
+
+ return (errorscrub_phys->dep_state == DSS_ERRORSCRUBBING &&
+ errorscrub_phys->dep_func == POOL_SCAN_ERRORSCRUB);
+}
+
+boolean_t
+dsl_errorscrub_is_paused(const dsl_scan_t *scn)
+{
+ return (dsl_errorscrubbing(scn->scn_dp) &&
+ scn->errorscrub_phys.dep_paused_flags);
+}
+
boolean_t
dsl_scan_is_paused_scrub(const dsl_scan_t *scn)
{
scn->scn_phys.scn_flags & DSF_SCRUB_PAUSED);
}
+static void
+dsl_errorscrub_sync_state(dsl_scan_t *scn, dmu_tx_t *tx)
+{
+ scn->errorscrub_phys.dep_cursor =
+ zap_cursor_serialize(&scn->errorscrub_cursor);
+
+ VERIFY0(zap_update(scn->scn_dp->dp_meta_objset,
+ DMU_POOL_DIRECTORY_OBJECT,
+ DMU_POOL_ERRORSCRUB, sizeof (uint64_t), ERRORSCRUB_PHYS_NUMINTS,
+ &scn->errorscrub_phys, tx));
+}
+
+static void
+dsl_errorscrub_setup_sync(void *arg, dmu_tx_t *tx)
+{
+ dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan;
+ pool_scan_func_t *funcp = arg;
+ dsl_pool_t *dp = scn->scn_dp;
+ spa_t *spa = dp->dp_spa;
+
+ ASSERT(!dsl_scan_is_running(scn));
+ ASSERT(!dsl_errorscrubbing(scn->scn_dp));
+ ASSERT(*funcp > POOL_SCAN_NONE && *funcp < POOL_SCAN_FUNCS);
+
+ memset(&scn->errorscrub_phys, 0, sizeof (scn->errorscrub_phys));
+ scn->errorscrub_phys.dep_func = *funcp;
+ scn->errorscrub_phys.dep_state = DSS_ERRORSCRUBBING;
+ scn->errorscrub_phys.dep_start_time = gethrestime_sec();
+ scn->errorscrub_phys.dep_to_examine = spa_get_last_errlog_size(spa);
+ scn->errorscrub_phys.dep_examined = 0;
+ scn->errorscrub_phys.dep_errors = 0;
+ scn->errorscrub_phys.dep_cursor = 0;
+ zap_cursor_init_serialized(&scn->errorscrub_cursor,
+ spa->spa_meta_objset, spa->spa_errlog_last,
+ scn->errorscrub_phys.dep_cursor);
+
+ vdev_config_dirty(spa->spa_root_vdev);
+ spa_event_notify(spa, NULL, NULL, ESC_ZFS_ERRORSCRUB_START);
+
+ dsl_errorscrub_sync_state(scn, tx);
+
+ spa_history_log_internal(spa, "error scrub setup", tx,
+ "func=%u mintxg=%u maxtxg=%llu",
+ *funcp, 0, (u_longlong_t)tx->tx_txg);
+}
+
+static int
+dsl_errorscrub_setup_check(void *arg, dmu_tx_t *tx)
+{
+ (void) arg;
+ dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan;
+
+ if (dsl_scan_is_running(scn) || (dsl_errorscrubbing(scn->scn_dp))) {
+ return (SET_ERROR(EBUSY));
+ }
+
+ if (spa_get_last_errlog_size(scn->scn_dp->dp_spa) == 0) {
+ return (ECANCELED);
+ }
+ return (0);
+}
+
/*
* Writes out a persistent dsl_scan_phys_t record to the pool directory.
* Because we can be running in the block sorting algorithm, we do not always
dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan;
vdev_t *rvd = scn->scn_dp->dp_spa->spa_root_vdev;
- if (dsl_scan_is_running(scn) || vdev_rebuild_active(rvd))
+ if (dsl_scan_is_running(scn) || vdev_rebuild_active(rvd) ||
+ dsl_errorscrubbing(scn->scn_dp))
return (SET_ERROR(EBUSY));
return (0);
void
dsl_scan_setup_sync(void *arg, dmu_tx_t *tx)
{
+ (void) arg;
dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan;
pool_scan_func_t *funcp = arg;
dmu_object_type_t ot = 0;
ASSERT(!dsl_scan_is_running(scn));
ASSERT(*funcp > POOL_SCAN_NONE && *funcp < POOL_SCAN_FUNCS);
memset(&scn->scn_phys, 0, sizeof (scn->scn_phys));
+
+ /*
+ * If we are starting a fresh scrub, we erase the error scrub
+ * information from disk.
+ */
+ memset(&scn->errorscrub_phys, 0, sizeof (scn->errorscrub_phys));
+ dsl_errorscrub_sync_state(scn, tx);
+
scn->scn_phys.scn_func = *funcp;
scn->scn_phys.scn_state = DSS_SCANNING;
scn->scn_phys.scn_min_txg = 0;
}
/*
- * Called by the ZFS_IOC_POOL_SCAN ioctl to start a scrub or resilver.
- * Can also be called to resume a paused scrub.
+ * Called by ZFS_IOC_POOL_SCRUB and ZFS_IOC_POOL_SCAN ioctl to start a scrub,
+ * error scrub or resilver. Can also be called to resume a paused scrub or
+ * error scrub.
*/
int
dsl_scan(dsl_pool_t *dp, pool_scan_func_t func)
return (0);
}
+ if (func == POOL_SCAN_ERRORSCRUB) {
+ if (dsl_errorscrub_is_paused(dp->dp_scan)) {
+ /*
+ * got error scrub start cmd, resume paused error scrub.
+ */
+ int err = dsl_scrub_set_pause_resume(scn->scn_dp,
+ POOL_SCRUB_NORMAL);
+ if (err == 0) {
+ spa_event_notify(spa, NULL, NULL,
+ ESC_ZFS_ERRORSCRUB_RESUME);
+ return (ECANCELED);
+ }
+ return (SET_ERROR(err));
+ }
+
+ return (dsl_sync_task(spa_name(dp->dp_spa),
+ dsl_errorscrub_setup_check, dsl_errorscrub_setup_sync,
+ &func, 0, ZFS_SPACE_CHECK_RESERVED));
+ }
+
if (func == POOL_SCAN_SCRUB && dsl_scan_is_paused_scrub(scn)) {
/* got scrub start cmd, resume paused scrub */
int err = dsl_scrub_set_pause_resume(scn->scn_dp,
spa_event_notify(spa, NULL, NULL, ESC_ZFS_SCRUB_RESUME);
return (SET_ERROR(ECANCELED));
}
-
return (SET_ERROR(err));
}
dsl_scan_setup_sync, &func, 0, ZFS_SPACE_CHECK_EXTRA_RESERVED));
}
+static void
+dsl_errorscrub_done(dsl_scan_t *scn, boolean_t complete, dmu_tx_t *tx)
+{
+ dsl_pool_t *dp = scn->scn_dp;
+ spa_t *spa = dp->dp_spa;
+
+ if (complete) {
+ spa_event_notify(spa, NULL, NULL, ESC_ZFS_ERRORSCRUB_FINISH);
+ spa_history_log_internal(spa, "error scrub done", tx,
+ "errors=%llu", (u_longlong_t)spa_approx_errlog_size(spa));
+ } else {
+ spa_history_log_internal(spa, "error scrub canceled", tx,
+ "errors=%llu", (u_longlong_t)spa_approx_errlog_size(spa));
+ }
+
+ scn->errorscrub_phys.dep_state = complete ? DSS_FINISHED : DSS_CANCELED;
+ spa->spa_scrub_active = B_FALSE;
+ spa_errlog_rotate(spa);
+ scn->errorscrub_phys.dep_end_time = gethrestime_sec();
+ zap_cursor_fini(&scn->errorscrub_cursor);
+
+ if (spa->spa_errata == ZPOOL_ERRATA_ZOL_2094_SCRUB)
+ spa->spa_errata = 0;
+
+ ASSERT(!dsl_errorscrubbing(scn->scn_dp));
+}
+
static void
dsl_scan_done(dsl_scan_t *scn, boolean_t complete, dmu_tx_t *tx)
{
ASSERT(!dsl_scan_is_running(scn));
}
+static int
+dsl_errorscrub_pause_resume_check(void *arg, dmu_tx_t *tx)
+{
+ pool_scrub_cmd_t *cmd = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ dsl_scan_t *scn = dp->dp_scan;
+
+ if (*cmd == POOL_SCRUB_PAUSE) {
+ /*
+ * can't pause a error scrub when there is no in-progress
+ * error scrub.
+ */
+ if (!dsl_errorscrubbing(dp))
+ return (SET_ERROR(ENOENT));
+
+ /* can't pause a paused error scrub */
+ if (dsl_errorscrub_is_paused(scn))
+ return (SET_ERROR(EBUSY));
+ } else if (*cmd != POOL_SCRUB_NORMAL) {
+ return (SET_ERROR(ENOTSUP));
+ }
+
+ return (0);
+}
+
+static void
+dsl_errorscrub_pause_resume_sync(void *arg, dmu_tx_t *tx)
+{
+ pool_scrub_cmd_t *cmd = arg;
+ dsl_pool_t *dp = dmu_tx_pool(tx);
+ spa_t *spa = dp->dp_spa;
+ dsl_scan_t *scn = dp->dp_scan;
+
+ if (*cmd == POOL_SCRUB_PAUSE) {
+ spa->spa_scan_pass_errorscrub_pause = gethrestime_sec();
+ scn->errorscrub_phys.dep_paused_flags = B_TRUE;
+ dsl_errorscrub_sync_state(scn, tx);
+ spa_event_notify(spa, NULL, NULL, ESC_ZFS_ERRORSCRUB_PAUSED);
+ } else {
+ ASSERT3U(*cmd, ==, POOL_SCRUB_NORMAL);
+ if (dsl_errorscrub_is_paused(scn)) {
+ /*
+ * We need to keep track of how much time we spend
+ * paused per pass so that we can adjust the error scrub
+ * rate shown in the output of 'zpool status'.
+ */
+ spa->spa_scan_pass_errorscrub_spent_paused +=
+ gethrestime_sec() -
+ spa->spa_scan_pass_errorscrub_pause;
+
+ spa->spa_scan_pass_errorscrub_pause = 0;
+ scn->errorscrub_phys.dep_paused_flags = B_FALSE;
+
+ zap_cursor_init_serialized(
+ &scn->errorscrub_cursor,
+ spa->spa_meta_objset, spa->spa_errlog_last,
+ scn->errorscrub_phys.dep_cursor);
+
+ dsl_errorscrub_sync_state(scn, tx);
+ }
+ }
+}
+
+static int
+dsl_errorscrub_cancel_check(void *arg, dmu_tx_t *tx)
+{
+ (void) arg;
+ dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan;
+ /* can't cancel a error scrub when there is no one in-progress */
+ if (!dsl_errorscrubbing(scn->scn_dp))
+ return (SET_ERROR(ENOENT));
+ return (0);
+}
+
+static void
+dsl_errorscrub_cancel_sync(void *arg, dmu_tx_t *tx)
+{
+ (void) arg;
+ dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan;
+
+ dsl_errorscrub_done(scn, B_FALSE, tx);
+ dsl_errorscrub_sync_state(scn, tx);
+ spa_event_notify(scn->scn_dp->dp_spa, NULL, NULL,
+ ESC_ZFS_ERRORSCRUB_ABORT);
+}
+
static int
dsl_scan_cancel_check(void *arg, dmu_tx_t *tx)
{
int
dsl_scan_cancel(dsl_pool_t *dp)
{
+ if (dsl_errorscrubbing(dp)) {
+ return (dsl_sync_task(spa_name(dp->dp_spa),
+ dsl_errorscrub_cancel_check, dsl_errorscrub_cancel_sync,
+ NULL, 3, ZFS_SPACE_CHECK_RESERVED));
+ }
return (dsl_sync_task(spa_name(dp->dp_spa), dsl_scan_cancel_check,
dsl_scan_cancel_sync, NULL, 3, ZFS_SPACE_CHECK_RESERVED));
}
int
dsl_scrub_set_pause_resume(const dsl_pool_t *dp, pool_scrub_cmd_t cmd)
{
+ if (dsl_errorscrubbing(dp)) {
+ return (dsl_sync_task(spa_name(dp->dp_spa),
+ dsl_errorscrub_pause_resume_check,
+ dsl_errorscrub_pause_resume_sync, &cmd, 3,
+ ZFS_SPACE_CHECK_RESERVED));
+ }
return (dsl_sync_task(spa_name(dp->dp_spa),
dsl_scrub_pause_resume_check, dsl_scrub_pause_resume_sync, &cmd, 3,
ZFS_SPACE_CHECK_RESERVED));
return (B_FALSE);
}
+static boolean_t
+dsl_error_scrub_check_suspend(dsl_scan_t *scn, const zbookmark_phys_t *zb)
+{
+ /*
+ * We suspend if:
+ * - we have scrubbed for at least the minimum time (default 1 sec
+ * for error scrub), someone is explicitly waiting for this txg
+ * to complete, or we have used up all of the time in the txg
+ * timeout (default 5 sec).
+ * or
+ * - the spa is shutting down because this pool is being exported
+ * or the machine is rebooting.
+ */
+ uint64_t curr_time_ns = gethrtime();
+ uint64_t error_scrub_time_ns = curr_time_ns - scn->scn_sync_start_time;
+ uint64_t sync_time_ns = curr_time_ns -
+ scn->scn_dp->dp_spa->spa_sync_starttime;
+ int mintime = zfs_scrub_min_time_ms;
+
+ if ((NSEC2MSEC(error_scrub_time_ns) > mintime &&
+ (txg_sync_waiting(scn->scn_dp) ||
+ NSEC2SEC(sync_time_ns) >= zfs_txg_timeout)) ||
+ spa_shutting_down(scn->scn_dp->dp_spa)) {
+ if (zb) {
+ dprintf("error scrub suspending at bookmark "
+ "%llx/%llx/%llx/%llx\n",
+ (longlong_t)zb->zb_objset,
+ (longlong_t)zb->zb_object,
+ (longlong_t)zb->zb_level,
+ (longlong_t)zb->zb_blkid);
+ }
+ return (B_TRUE);
+ }
+ return (B_FALSE);
+}
+
typedef struct zil_scan_arg {
dsl_pool_t *zsa_dp;
zil_header_t *zsa_zh;
return ((used != 0) || (clones_left));
}
+boolean_t
+dsl_errorscrub_active(dsl_scan_t *scn)
+{
+ spa_t *spa = scn->scn_dp->dp_spa;
+ if (spa->spa_load_state != SPA_LOAD_NONE)
+ return (B_FALSE);
+ if (spa_shutting_down(spa))
+ return (B_FALSE);
+ if (dsl_errorscrubbing(scn->scn_dp))
+ return (B_TRUE);
+ return (B_FALSE);
+}
+
static boolean_t
dsl_scan_check_deferred(vdev_t *vd)
{
return (0);
}
+static void
+name_to_bookmark(char *buf, zbookmark_phys_t *zb)
+{
+ zb->zb_objset = zfs_strtonum(buf, &buf);
+ ASSERT(*buf == ':');
+ zb->zb_object = zfs_strtonum(buf + 1, &buf);
+ ASSERT(*buf == ':');
+ zb->zb_level = (int)zfs_strtonum(buf + 1, &buf);
+ ASSERT(*buf == ':');
+ zb->zb_blkid = zfs_strtonum(buf + 1, &buf);
+ ASSERT(*buf == '\0');
+}
+
+static void
+name_to_object(char *buf, uint64_t *obj)
+{
+ *obj = zfs_strtonum(buf, &buf);
+ ASSERT(*buf == '\0');
+}
+
+static void
+read_by_block_level(dsl_scan_t *scn, zbookmark_phys_t zb)
+{
+ dsl_pool_t *dp = scn->scn_dp;
+ dsl_dataset_t *ds;
+ objset_t *os;
+ if (dsl_dataset_hold_obj(dp, zb.zb_objset, FTAG, &ds) != 0)
+ return;
+
+ if (dmu_objset_from_ds(ds, &os) != 0) {
+ dsl_dataset_rele(ds, FTAG);
+ return;
+ }
+
+ /*
+ * If the key is not loaded dbuf_dnode_findbp() will error out with
+ * EACCES. However in that case dnode_hold() will eventually call
+ * dbuf_read()->zio_wait() which may call spa_log_error(). This will
+ * lead to a deadlock due to us holding the mutex spa_errlist_lock.
+ * Avoid this by checking here if the keys are loaded, if not return.
+ * If the keys are not loaded the head_errlog feature is meaningless
+ * as we cannot figure out the birth txg of the block pointer.
+ */
+ if (dsl_dataset_get_keystatus(ds->ds_dir) ==
+ ZFS_KEYSTATUS_UNAVAILABLE) {
+ dsl_dataset_rele(ds, FTAG);
+ return;
+ }
+
+ dnode_t *dn;
+ blkptr_t bp;
+
+ if (dnode_hold(os, zb.zb_object, FTAG, &dn) != 0) {
+ dsl_dataset_rele(ds, FTAG);
+ return;
+ }
+
+ rw_enter(&dn->dn_struct_rwlock, RW_READER);
+ int error = dbuf_dnode_findbp(dn, zb.zb_level, zb.zb_blkid, &bp, NULL,
+ NULL);
+
+ if (error) {
+ rw_exit(&dn->dn_struct_rwlock);
+ dnode_rele(dn, FTAG);
+ dsl_dataset_rele(ds, FTAG);
+ return;
+ }
+
+ if (!error && BP_IS_HOLE(&bp)) {
+ rw_exit(&dn->dn_struct_rwlock);
+ dnode_rele(dn, FTAG);
+ dsl_dataset_rele(ds, FTAG);
+ return;
+ }
+
+ int zio_flags = ZIO_FLAG_SCAN_THREAD | ZIO_FLAG_RAW |
+ ZIO_FLAG_CANFAIL | ZIO_FLAG_SCRUB;
+
+ /* If it's an intent log block, failure is expected. */
+ if (zb.zb_level == ZB_ZIL_LEVEL)
+ zio_flags |= ZIO_FLAG_SPECULATIVE;
+
+ ASSERT(!BP_IS_EMBEDDED(&bp));
+ scan_exec_io(dp, &bp, zio_flags, &zb, NULL);
+ rw_exit(&dn->dn_struct_rwlock);
+ dnode_rele(dn, FTAG);
+ dsl_dataset_rele(ds, FTAG);
+}
+
+/*
+ * We keep track of the scrubbed error blocks in "count". This will be used
+ * when deciding whether we exceeded zfs_scrub_error_blocks_per_txg. This
+ * function is modelled after check_filesystem().
+ */
+static int
+scrub_filesystem(spa_t *spa, uint64_t fs, zbookmark_err_phys_t *zep,
+ int *count)
+{
+ dsl_dataset_t *ds;
+ dsl_pool_t *dp = spa->spa_dsl_pool;
+ dsl_scan_t *scn = dp->dp_scan;
+
+ int error = dsl_dataset_hold_obj(dp, fs, FTAG, &ds);
+ if (error != 0)
+ return (error);
+
+ uint64_t latest_txg;
+ uint64_t txg_to_consider = spa->spa_syncing_txg;
+ boolean_t check_snapshot = B_TRUE;
+
+ error = find_birth_txg(ds, zep, &latest_txg);
+
+ /*
+ * If find_birth_txg() errors out, then err on the side of caution and
+ * proceed. In worst case scenario scrub all objects. If zep->zb_birth
+ * is 0 (e.g. in case of encryption with unloaded keys) also proceed to
+ * scrub all objects.
+ */
+ if (error == 0 && zep->zb_birth == latest_txg) {
+ /* Block neither free nor re written. */
+ zbookmark_phys_t zb;
+ zep_to_zb(fs, zep, &zb);
+ scn->scn_zio_root = zio_root(spa, NULL, NULL,
+ ZIO_FLAG_CANFAIL);
+ /* We have already acquired the config lock for spa */
+ read_by_block_level(scn, zb);
+
+ (void) zio_wait(scn->scn_zio_root);
+ scn->scn_zio_root = NULL;
+
+ scn->errorscrub_phys.dep_examined++;
+ scn->errorscrub_phys.dep_to_examine--;
+ (*count)++;
+ if ((*count) == zfs_scrub_error_blocks_per_txg ||
+ dsl_error_scrub_check_suspend(scn, &zb)) {
+ dsl_dataset_rele(ds, FTAG);
+ return (SET_ERROR(EFAULT));
+ }
+
+ check_snapshot = B_FALSE;
+ } else if (error == 0) {
+ txg_to_consider = latest_txg;
+ }
+
+ /*
+ * Retrieve the number of snapshots if the dataset is not a snapshot.
+ */
+ uint64_t snap_count = 0;
+ if (dsl_dataset_phys(ds)->ds_snapnames_zapobj != 0) {
+
+ error = zap_count(spa->spa_meta_objset,
+ dsl_dataset_phys(ds)->ds_snapnames_zapobj, &snap_count);
+
+ if (error != 0) {
+ dsl_dataset_rele(ds, FTAG);
+ return (error);
+ }
+ }
+
+ if (snap_count == 0) {
+ /* Filesystem without snapshots. */
+ dsl_dataset_rele(ds, FTAG);
+ return (0);
+ }
+
+ uint64_t snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
+ uint64_t snap_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
+
+ dsl_dataset_rele(ds, FTAG);
+
+ /* Check only snapshots created from this file system. */
+ while (snap_obj != 0 && zep->zb_birth < snap_obj_txg &&
+ snap_obj_txg <= txg_to_consider) {
+
+ error = dsl_dataset_hold_obj(dp, snap_obj, FTAG, &ds);
+ if (error != 0)
+ return (error);
+
+ if (dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj != fs) {
+ snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
+ snap_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
+ dsl_dataset_rele(ds, FTAG);
+ continue;
+ }
+
+ boolean_t affected = B_TRUE;
+ if (check_snapshot) {
+ uint64_t blk_txg;
+ error = find_birth_txg(ds, zep, &blk_txg);
+
+ /*
+ * Scrub the snapshot also when zb_birth == 0 or when
+ * find_birth_txg() returns an error.
+ */
+ affected = (error == 0 && zep->zb_birth == blk_txg) ||
+ (error != 0) || (zep->zb_birth == 0);
+ }
+
+ /* Scrub snapshots. */
+ if (affected) {
+ zbookmark_phys_t zb;
+ zep_to_zb(snap_obj, zep, &zb);
+ scn->scn_zio_root = zio_root(spa, NULL, NULL,
+ ZIO_FLAG_CANFAIL);
+ /* We have already acquired the config lock for spa */
+ read_by_block_level(scn, zb);
+
+ (void) zio_wait(scn->scn_zio_root);
+ scn->scn_zio_root = NULL;
+
+ scn->errorscrub_phys.dep_examined++;
+ scn->errorscrub_phys.dep_to_examine--;
+ (*count)++;
+ if ((*count) == zfs_scrub_error_blocks_per_txg ||
+ dsl_error_scrub_check_suspend(scn, &zb)) {
+ dsl_dataset_rele(ds, FTAG);
+ return (EFAULT);
+ }
+ }
+ snap_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg;
+ snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
+ dsl_dataset_rele(ds, FTAG);
+ }
+ return (0);
+}
+
+void
+dsl_errorscrub_sync(dsl_pool_t *dp, dmu_tx_t *tx)
+{
+ spa_t *spa = dp->dp_spa;
+ dsl_scan_t *scn = dp->dp_scan;
+
+ /*
+ * Only process scans in sync pass 1.
+ */
+
+ if (spa_sync_pass(spa) > 1)
+ return;
+
+ /*
+ * If the spa is shutting down, then stop scanning. This will
+ * ensure that the scan does not dirty any new data during the
+ * shutdown phase.
+ */
+ if (spa_shutting_down(spa))
+ return;
+
+ if (!dsl_errorscrub_active(scn) || dsl_errorscrub_is_paused(scn)) {
+ return;
+ }
+
+ if (dsl_scan_resilvering(scn->scn_dp)) {
+ /* cancel the error scrub if resilver started */
+ dsl_scan_cancel(scn->scn_dp);
+ return;
+ }
+
+ spa->spa_scrub_active = B_TRUE;
+ scn->scn_sync_start_time = gethrtime();
+
+ /*
+ * zfs_scan_suspend_progress can be set to disable scrub progress.
+ * See more detailed comment in dsl_scan_sync().
+ */
+ if (zfs_scan_suspend_progress) {
+ uint64_t scan_time_ns = gethrtime() - scn->scn_sync_start_time;
+ int mintime = zfs_scrub_min_time_ms;
+
+ while (zfs_scan_suspend_progress &&
+ !txg_sync_waiting(scn->scn_dp) &&
+ !spa_shutting_down(scn->scn_dp->dp_spa) &&
+ NSEC2MSEC(scan_time_ns) < mintime) {
+ delay(hz);
+ scan_time_ns = gethrtime() - scn->scn_sync_start_time;
+ }
+ return;
+ }
+
+ int i = 0;
+ zap_attribute_t *za;
+ zbookmark_phys_t *zb;
+ boolean_t limit_exceeded = B_FALSE;
+
+ za = kmem_zalloc(sizeof (zap_attribute_t), KM_SLEEP);
+ zb = kmem_zalloc(sizeof (zbookmark_phys_t), KM_SLEEP);
+
+ if (!spa_feature_is_enabled(spa, SPA_FEATURE_HEAD_ERRLOG)) {
+ for (; zap_cursor_retrieve(&scn->errorscrub_cursor, za) == 0;
+ zap_cursor_advance(&scn->errorscrub_cursor)) {
+ name_to_bookmark(za->za_name, zb);
+
+ scn->scn_zio_root = zio_root(dp->dp_spa, NULL,
+ NULL, ZIO_FLAG_CANFAIL);
+ dsl_pool_config_enter(dp, FTAG);
+ read_by_block_level(scn, *zb);
+ dsl_pool_config_exit(dp, FTAG);
+
+ (void) zio_wait(scn->scn_zio_root);
+ scn->scn_zio_root = NULL;
+
+ scn->errorscrub_phys.dep_examined += 1;
+ scn->errorscrub_phys.dep_to_examine -= 1;
+ i++;
+ if (i == zfs_scrub_error_blocks_per_txg ||
+ dsl_error_scrub_check_suspend(scn, zb)) {
+ limit_exceeded = B_TRUE;
+ break;
+ }
+ }
+
+ if (!limit_exceeded)
+ dsl_errorscrub_done(scn, B_TRUE, tx);
+
+ dsl_errorscrub_sync_state(scn, tx);
+ kmem_free(za, sizeof (*za));
+ kmem_free(zb, sizeof (*zb));
+ return;
+ }
+
+ int error = 0;
+ for (; zap_cursor_retrieve(&scn->errorscrub_cursor, za) == 0;
+ zap_cursor_advance(&scn->errorscrub_cursor)) {
+
+ zap_cursor_t *head_ds_cursor;
+ zap_attribute_t *head_ds_attr;
+ zbookmark_err_phys_t head_ds_block;
+
+ head_ds_cursor = kmem_zalloc(sizeof (zap_cursor_t), KM_SLEEP);
+ head_ds_attr = kmem_zalloc(sizeof (zap_attribute_t), KM_SLEEP);
+
+ uint64_t head_ds_err_obj = za->za_first_integer;
+ uint64_t head_ds;
+ name_to_object(za->za_name, &head_ds);
+ boolean_t config_held = B_FALSE;
+ uint64_t top_affected_fs;
+
+ for (zap_cursor_init(head_ds_cursor, spa->spa_meta_objset,
+ head_ds_err_obj); zap_cursor_retrieve(head_ds_cursor,
+ head_ds_attr) == 0; zap_cursor_advance(head_ds_cursor)) {
+
+ name_to_errphys(head_ds_attr->za_name, &head_ds_block);
+
+ /*
+ * In case we are called from spa_sync the pool
+ * config is already held.
+ */
+ if (!dsl_pool_config_held(dp)) {
+ dsl_pool_config_enter(dp, FTAG);
+ config_held = B_TRUE;
+ }
+
+ error = find_top_affected_fs(spa,
+ head_ds, &head_ds_block, &top_affected_fs);
+ if (error)
+ break;
+
+ error = scrub_filesystem(spa, top_affected_fs,
+ &head_ds_block, &i);
+
+ if (error == SET_ERROR(EFAULT)) {
+ limit_exceeded = B_TRUE;
+ break;
+ }
+ }
+
+ zap_cursor_fini(head_ds_cursor);
+ kmem_free(head_ds_cursor, sizeof (*head_ds_cursor));
+ kmem_free(head_ds_attr, sizeof (*head_ds_attr));
+
+ if (config_held)
+ dsl_pool_config_exit(dp, FTAG);
+ }
+
+ kmem_free(za, sizeof (*za));
+ kmem_free(zb, sizeof (*zb));
+ if (!limit_exceeded)
+ dsl_errorscrub_done(scn, B_TRUE, tx);
+
+ dsl_errorscrub_sync_state(scn, tx);
+}
+
/*
* This is the primary entry point for scans that is called from syncing
* context. Scans must happen entirely during syncing context so that we
if (zio->io_error && (zio->io_error != ECKSUM ||
!(zio->io_flags & ZIO_FLAG_SPECULATIVE))) {
- atomic_inc_64(&spa->spa_dsl_pool->dp_scan->scn_phys.scn_errors);
+ if (dsl_errorscrubbing(spa->spa_dsl_pool) &&
+ !dsl_errorscrub_is_paused(spa->spa_dsl_pool->dp_scan)) {
+ atomic_inc_64(&spa->spa_dsl_pool->dp_scan
+ ->errorscrub_phys.dep_errors);
+ } else {
+ atomic_inc_64(&spa->spa_dsl_pool->dp_scan->scn_phys
+ .scn_errors);
+ }
}
}
ZFS_MODULE_PARAM(zfs, zfs_, resilver_disable_defer, INT, ZMOD_RW,
"Process all resilvers immediately");
+
+ZFS_MODULE_PARAM(zfs, zfs_, scrub_error_blocks_per_txg, U64, ZMOD_RW,
+ "Error blocks to be scrubbed in one txg");
+/* END CSTYLED */
projects / mirror_zfs.git / blobdiff