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Illumos 5056 - ZFS deadlock on db_mtx and dn_holds

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5056 ZFS deadlock on db_mtx and dn_holds
Author: Justin Gibbs <justing@spectralogic.com>
Reviewed by: Will Andrews <willa@spectralogic.com>
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Dan McDonald <danmcd@omniti.com>

References:
  https://www.illumos.org/issues/5056
  https://github.com/illumos/illumos-gate/commit/bc9014e

Porting Notes:

sa_handle_get_from_db():
  - the original patch includes an otherwise unmentioned fix for a
    possible usage of an uninitialised variable

dmu_objset_open_impl():
  - Under Illumos list_link_init() is the same as filling a list_node_t
    with NULLs, so they don't notice if they miss doing list_link_init()
    on a zero'd containing structure (e.g. allocated with kmem_zalloc as
    here). Under Linux, not so much: an uninitialised list_node_t goes
    "Boom!" some time later when it's used or destroyed.

dmu_objset_evict_dbufs():
  - reduce stack usage using kmem_alloc()

Ported-by: Chris Dunlop <chris@onthe.net.au>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Justin T. Gibbs
2015-04-02 14:44:32 +11:00
committed by Brian Behlendorf
parent d683ddbb72
commit 0c66c32d1d
35 changed files with 645 additions and 316 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/dsl_prop.c
+6 -8
View File
@@ -163,19 +163,17 @@ dsl_prop_get_ds(dsl_dataset_t *ds, const char *propname,
{
zfs_prop_t prop = zfs_name_to_prop(propname);
boolean_t inheritable;
boolean_t snapshot;
uint64_t zapobj;
ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
inheritable = (prop == ZPROP_INVAL || zfs_prop_inheritable(prop));
snapshot = dsl_dataset_is_snapshot(ds);
zapobj = dsl_dataset_phys(ds)->ds_props_obj;
if (zapobj != 0) {
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
int err;
ASSERT(snapshot);
ASSERT(ds->ds_is_snapshot);
/* Check for a local value. */
err = zap_lookup(mos, zapobj, propname, intsz, numints, buf);
@@ -215,7 +213,7 @@ dsl_prop_get_ds(dsl_dataset_t *ds, const char *propname,
}
return (dsl_prop_get_dd(ds->ds_dir, propname,
intsz, numints, buf, setpoint, snapshot));
intsz, numints, buf, setpoint, ds->ds_is_snapshot));
}
/*
@@ -545,7 +543,7 @@ dsl_prop_set_sync_impl(dsl_dataset_t *ds, const char *propname,
isint = (dodefault(propname, 8, 1, &intval) == 0);
if (dsl_dataset_is_snapshot(ds)) {
if (ds->ds_is_snapshot) {
ASSERT(version >= SPA_VERSION_SNAP_PROPS);
if (dsl_dataset_phys(ds)->ds_props_obj == 0) {
dmu_buf_will_dirty(ds->ds_dbuf, tx);
@@ -642,7 +640,7 @@ dsl_prop_set_sync_impl(dsl_dataset_t *ds, const char *propname,
if (isint) {
VERIFY0(dsl_prop_get_int_ds(ds, propname, &intval));
if (dsl_dataset_is_snapshot(ds)) {
if (ds->ds_is_snapshot) {
dsl_prop_cb_record_t *cbr;
/*
* It's a snapshot; nothing can inherit this
@@ -760,7 +758,7 @@ dsl_props_set_check(void *arg, dmu_tx_t *tx)
}
}
if (dsl_dataset_is_snapshot(ds) && version < SPA_VERSION_SNAP_PROPS) {
if (ds->ds_is_snapshot && version < SPA_VERSION_SNAP_PROPS) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(ENOTSUP));
}
@@ -983,7 +981,7 @@ dsl_prop_get_all_ds(dsl_dataset_t *ds, nvlist_t **nvp,
VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
if (dsl_dataset_is_snapshot(ds))
if (ds->ds_is_snapshot)
flags |= DSL_PROP_GET_SNAPSHOT;
ASSERT(dsl_pool_config_held(dp));