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Allow dsl_deadlist_open() return errors

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In some cases like dsl_dataset_hold_obj() it is possible to handle
those errors, so failure to hold dataset should be better than
kernel panic.  Some other places where these errors are still not
handled but asserted should be less dangerous just as unreachable.

We have a user report about pool corruption leading to assertions
on these errors.  Hopefully this will make behavior a bit nicer.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #16836
This commit is contained in:
Alexander Motin
2024-12-04 18:15:58 -05:00
committed by GitHub
parent 0e020bf3e1
commit c33a55b0c2
8 changed files with 51 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/dsl_dataset.c
+25 -20
View File
@@ -701,13 +701,17 @@ dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, const void *tag,
ZPOOL_ERRATA_ZOL_8308_ENCRYPTION;
}
dsl_deadlist_open(&ds->ds_deadlist,
mos, dsl_dataset_phys(ds)->ds_deadlist_obj);
uint64_t remap_deadlist_obj =
dsl_dataset_get_remap_deadlist_object(ds);
if (remap_deadlist_obj != 0) {
dsl_deadlist_open(&ds->ds_remap_deadlist, mos,
remap_deadlist_obj);
if (err == 0) {
err = dsl_deadlist_open(&ds->ds_deadlist,
mos, dsl_dataset_phys(ds)->ds_deadlist_obj);
}
if (err == 0) {
uint64_t remap_deadlist_obj =
dsl_dataset_get_remap_deadlist_object(ds);
if (remap_deadlist_obj != 0) {
err = dsl_deadlist_open(&ds->ds_remap_deadlist,
mos, remap_deadlist_obj);
}
}
dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync,
@@ -716,7 +720,8 @@ dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, const void *tag,
winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu);
if (err != 0 || winner != NULL) {
dsl_deadlist_close(&ds->ds_deadlist);
if (dsl_deadlist_is_open(&ds->ds_deadlist))
dsl_deadlist_close(&ds->ds_deadlist);
if (dsl_deadlist_is_open(&ds->ds_remap_deadlist))
dsl_deadlist_close(&ds->ds_remap_deadlist);
dsl_bookmark_fini_ds(ds);
@@ -1823,8 +1828,8 @@ dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX,
dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
dsl_deadlist_close(&ds->ds_deadlist);
dsl_deadlist_open(&ds->ds_deadlist, mos,
dsl_dataset_phys(ds)->ds_deadlist_obj);
VERIFY0(dsl_deadlist_open(&ds->ds_deadlist, mos,
dsl_dataset_phys(ds)->ds_deadlist_obj));
dsl_deadlist_add_key(&ds->ds_deadlist,
dsl_dataset_phys(ds)->ds_prev_snap_txg, tx);
dsl_bookmark_snapshotted(ds, tx);
@@ -4044,14 +4049,14 @@ dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone,
if (clone_remap_dl_obj != 0) {
dsl_dataset_set_remap_deadlist_object(origin,
clone_remap_dl_obj, tx);
dsl_deadlist_open(&origin->ds_remap_deadlist,
dp->dp_meta_objset, clone_remap_dl_obj);
VERIFY0(dsl_deadlist_open(&origin->ds_remap_deadlist,
dp->dp_meta_objset, clone_remap_dl_obj));
}
if (origin_remap_dl_obj != 0) {
dsl_dataset_set_remap_deadlist_object(clone,
origin_remap_dl_obj, tx);
dsl_deadlist_open(&clone->ds_remap_deadlist,
dp->dp_meta_objset, origin_remap_dl_obj);
VERIFY0(dsl_deadlist_open(&clone->ds_remap_deadlist,
dp->dp_meta_objset, origin_remap_dl_obj));
}
}
@@ -4222,10 +4227,10 @@ dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
dsl_deadlist_close(&origin_head->ds_deadlist);
SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj,
dsl_dataset_phys(clone)->ds_deadlist_obj);
dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
dsl_dataset_phys(clone)->ds_deadlist_obj);
dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
dsl_dataset_phys(origin_head)->ds_deadlist_obj);
VERIFY0(dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset,
dsl_dataset_phys(clone)->ds_deadlist_obj));
VERIFY0(dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset,
dsl_dataset_phys(origin_head)->ds_deadlist_obj));
dsl_dataset_swap_remap_deadlists(clone, origin_head, tx);
/*
@@ -4959,8 +4964,8 @@ dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx)
dsl_dataset_phys(ds)->ds_prev_snap_obj, tx);
dsl_dataset_set_remap_deadlist_object(ds,
remap_deadlist_obj, tx);
dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa),
remap_deadlist_obj);
VERIFY0(dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa),
remap_deadlist_obj));
spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
}