Fix gcc unused variable warnings

Gcc -Wall warn: 'unused variable'

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

cmd/zpool/zpool_main.c

@@ -2202,7 +2202,7 @@ get_interval_count(int *argcp, char **argv, unsigned long *iv,
     unsigned long *cnt)
 {
 	unsigned long interval = 0, count = 0;
-	int argc = *argcp, errno;
+	int argc = *argcp;
 
 	/*
 	 * Determine if the last argument is an integer or a pool name

cmd/ztest/ztest.c

@@ -1042,6 +1042,7 @@ ztest_pattern_set(void *buf, uint64_t size, uint64_t value)
 		*ip++ = value;
 }
 
+#ifndef NDEBUG
 static boolean_t
 ztest_pattern_match(void *buf, uint64_t size, uint64_t value)
 {
@@ -1054,6 +1055,7 @@ ztest_pattern_match(void *buf, uint64_t size, uint64_t value)
 
 	return (diff == 0);
 }
+#endif
 
 static void
 ztest_bt_generate(ztest_block_tag_t *bt, objset_t *os, uint64_t object,
@@ -2582,7 +2584,7 @@ ztest_vdev_attach_detach(ztest_ds_t *zd, uint64_t id)
 vdev_t *
 grow_vdev(vdev_t *vd, void *arg)
 {
-	spa_t *spa = vd->vdev_spa;
+	ASSERTV(spa_t *spa = vd->vdev_spa);
 	size_t *newsize = arg;
 	size_t fsize;
 	int fd;

module/zfs/arc.c

@@ -1989,9 +1989,8 @@ arc_shrink(void)
 static int
 arc_reclaim_needed(void)
 {
-	uint64_t extra;
-
 #ifdef _KERNEL
+	uint64_t extra;
 
 	if (needfree)
 		return (1);

module/zfs/dbuf.c

@@ -373,7 +373,8 @@ dbuf_verify(dmu_buf_impl_t *db)
 				    &dn->dn_phys->dn_blkptr[db->db_blkid]);
 		} else {
 			/* db is pointed to by an indirect block */
-			int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT;
+			ASSERTV(int epb = db->db_parent->db.db_size >>
+				SPA_BLKPTRSHIFT);
 			ASSERT3U(db->db_parent->db_level, ==, db->db_level+1);
 			ASSERT3U(db->db_parent->db.db_object, ==,
 			    db->db.db_object);
@@ -399,7 +400,7 @@ dbuf_verify(dmu_buf_impl_t *db)
 		 * data when we evict this buffer.
 		 */
 		if (db->db_dirtycnt == 0) {
-			uint64_t *buf = db->db.db_data;
+			ASSERTV(uint64_t *buf = db->db.db_data);
 			int i;
 
 			for (i = 0; i < db->db.db_size >> 3; i++) {
@@ -1999,8 +2000,7 @@ dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx)
 void
 dbuf_add_ref(dmu_buf_impl_t *db, void *tag)
 {
-	int64_t holds = refcount_add(&db->db_holds, tag);
+	VERIFY(refcount_add(&db->db_holds, tag) > 1);
-	ASSERT(holds > 1);
 }
 
 /*
@@ -2564,8 +2564,8 @@ dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb)
 		ASSERT(list_head(&dr->dt.di.dr_children) == NULL);
 		ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift);
 		if (!BP_IS_HOLE(db->db_blkptr)) {
-			int epbs =
+			ASSERTV(int epbs = dn->dn_phys->dn_indblkshift -
-			    dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT;
+			    SPA_BLKPTRSHIFT);
 			ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==,
 			    db->db.db_size);
 			ASSERT3U(dn->dn_phys->dn_maxblkid

module/zfs/dnode.c

@@ -52,7 +52,7 @@ static kmem_cache_t *dnode_cache;
 #define	DNODE_STAT_ADD(stat)			/* nothing */
 #endif	/* DNODE_STATS */
 
-static dnode_phys_t dnode_phys_zero;
+ASSERTV(static dnode_phys_t dnode_phys_zero);
 
 int zfs_default_bs = SPA_MINBLOCKSHIFT;
 int zfs_default_ibs = DN_MAX_INDBLKSHIFT;

module/zfs/dnode_sync.c

@@ -328,8 +328,8 @@ dnode_sync_free_range(dnode_t *dn, uint64_t blkid, uint64_t nblks, dmu_tx_t *tx)
 		ASSERT3U(blkid + nblks, <=, dn->dn_phys->dn_nblkptr);
 		(void) free_blocks(dn, bp + blkid, nblks, tx);
 		if (trunc) {
-			uint64_t off = (dn->dn_phys->dn_maxblkid + 1) *
+			ASSERTV(uint64_t off = (dn->dn_phys->dn_maxblkid + 1) *
-			    (dn->dn_phys->dn_datablkszsec << SPA_MINBLOCKSHIFT);
+			    (dn->dn_phys->dn_datablkszsec<<SPA_MINBLOCKSHIFT));
 			dn->dn_phys->dn_maxblkid = (blkid ? blkid - 1 : 0);
 			ASSERT(off < dn->dn_phys->dn_maxblkid ||
 			    dn->dn_phys->dn_maxblkid == 0 ||
@@ -358,8 +358,8 @@ dnode_sync_free_range(dnode_t *dn, uint64_t blkid, uint64_t nblks, dmu_tx_t *tx)
 		dbuf_rele(db, FTAG);
 	}
 	if (trunc) {
-		uint64_t off = (dn->dn_phys->dn_maxblkid + 1) *
+		ASSERTV(uint64_t off = (dn->dn_phys->dn_maxblkid + 1) *
-		    (dn->dn_phys->dn_datablkszsec << SPA_MINBLOCKSHIFT);
+		    (dn->dn_phys->dn_datablkszsec << SPA_MINBLOCKSHIFT));
 		dn->dn_phys->dn_maxblkid = (blkid ? blkid - 1 : 0);
 		ASSERT(off < dn->dn_phys->dn_maxblkid ||
 		    dn->dn_phys->dn_maxblkid == 0 ||
@@ -527,8 +527,8 @@ dnode_sync(dnode_t *dn, dmu_tx_t *tx)
 	dnode_phys_t *dnp = dn->dn_phys;
 	int txgoff = tx->tx_txg & TXG_MASK;
 	list_t *list = &dn->dn_dirty_records[txgoff];
-	static const dnode_phys_t zerodn = { 0 };
 	boolean_t kill_spill = B_FALSE;
+	ASSERTV(static const dnode_phys_t zerodn = { 0 });
 
 	ASSERT(dmu_tx_is_syncing(tx));
 	ASSERT(dnp->dn_type != DMU_OT_NONE || dn->dn_allocated_txg);

module/zfs/dsl_dataset.c

@@ -1121,8 +1121,7 @@ dsl_dataset_destroy(dsl_dataset_t *ds, void *tag, boolean_t defer)
 	 */
 	if (ds->ds_phys->ds_bp.blk_fill == 0 &&
 	    dmu_objset_userused_enabled(os)) {
-		uint64_t count;
+		ASSERTV(uint64_t count);
-
 		ASSERT(zap_count(os, DMU_USERUSED_OBJECT, &count) != 0 ||
 		    count == 0);
 		ASSERT(zap_count(os, DMU_GROUPUSED_OBJECT, &count) != 0 ||
@@ -1495,8 +1494,8 @@ static void
 remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, dmu_tx_t *tx)
 {
 	objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
-	uint64_t count;
 	int err;
+	ASSERTV(uint64_t count);
 
 	ASSERT(ds->ds_phys->ds_num_children >= 2);
 	err = zap_remove_int(mos, ds->ds_phys->ds_next_clones_obj, obj, tx);
@@ -1921,7 +1920,7 @@ dsl_dataset_destroy_sync(void *arg1, void *tag, dmu_tx_t *tx)
 	    "dataset = %llu", ds->ds_object);
 
 	if (ds->ds_phys->ds_next_clones_obj != 0) {
-		uint64_t count;
+		ASSERTV(uint64_t count);
 		ASSERT(0 == zap_count(mos,
 		    ds->ds_phys->ds_next_clones_obj, &count) && count == 0);
 		VERIFY(0 == dmu_object_free(mos,
@@ -2251,7 +2250,7 @@ dsl_dataset_space(dsl_dataset_t *ds,
 boolean_t
 dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds)
 {
-	dsl_pool_t *dp = ds->ds_dir->dd_pool;
+	ASSERTV(dsl_pool_t *dp = ds->ds_dir->dd_pool);
 
 	ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) ||
 	    dsl_pool_sync_context(dp));
@@ -2522,7 +2521,6 @@ struct promotearg {
 };
 
 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep);
-static boolean_t snaplist_unstable(list_t *l);
 
 static int
 dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx)

module/zfs/dsl_dir.c

@@ -47,7 +47,7 @@ static void
 dsl_dir_evict(dmu_buf_t *db, void *arg)
 {
 	dsl_dir_t *dd = arg;
-	dsl_pool_t *dp = dd->dd_pool;
+	ASSERTV(dsl_pool_t *dp = dd->dd_pool;)
 	int t;
 
 	for (t = 0; t < TXG_SIZE; t++) {

module/zfs/sa.c

@@ -1206,9 +1206,9 @@ sa_byteswap(sa_handle_t *hdl, sa_buf_type_t buftype)
 {
 	sa_hdr_phys_t *sa_hdr_phys = SA_GET_HDR(hdl, buftype);
 	dmu_buf_impl_t *db;
-	sa_os_t *sa = hdl->sa_os->os_sa;
 	int num_lengths = 1;
 	int i;
+	ASSERTV(sa_os_t *sa = hdl->sa_os->os_sa);
 
 	ASSERT(MUTEX_HELD(&sa->sa_lock));
 	if (sa_hdr_phys->sa_magic == SA_MAGIC)
@@ -1309,7 +1309,7 @@ sa_idx_tab_rele(objset_t *os, void *arg)
 static void
 sa_idx_tab_hold(objset_t *os, sa_idx_tab_t *idx_tab)
 {
-	sa_os_t *sa = os->os_sa;
+	ASSERTV(sa_os_t *sa = os->os_sa);
 
 	ASSERT(MUTEX_HELD(&sa->sa_lock));
 	(void) refcount_add(&idx_tab->sa_refcount, NULL);
@@ -1345,10 +1345,10 @@ sa_handle_get_from_db(objset_t *os, dmu_buf_t *db, void *userp,
     sa_handle_type_t hdl_type, sa_handle_t **handlepp)
 {
 	int error = 0;
-	dmu_object_info_t doi;
 	sa_handle_t *handle;
-
 #ifdef ZFS_DEBUG
+	dmu_object_info_t doi;
+
 	dmu_object_info_from_db(db, &doi);
 	ASSERT(doi.doi_bonus_type == DMU_OT_SA ||
 	    doi.doi_bonus_type == DMU_OT_ZNODE);

module/zfs/spa.c

@@ -3816,7 +3816,7 @@ int
 spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing)
 {
 	uint64_t txg, dtl_max_txg;
-	vdev_t *rvd = spa->spa_root_vdev;
+	ASSERTV(vdev_t *rvd = spa->spa_root_vdev;)
 	vdev_t *oldvd, *newvd, *newrootvd, *pvd, *tvd;
 	vdev_ops_t *pvops;
 	char *oldvdpath, *newvdpath;
@@ -4016,7 +4016,7 @@ spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, int replace_done)
 {
 	uint64_t txg;
 	int error;
-	vdev_t *rvd = spa->spa_root_vdev;
+	ASSERTV(vdev_t *rvd = spa->spa_root_vdev;)
 	vdev_t *vd, *pvd, *cvd, *tvd;
 	boolean_t unspare = B_FALSE;
 	uint64_t unspare_guid;

module/zfs/vdev.c

@@ -1412,8 +1412,8 @@ vdev_validate(vdev_t *vd)
 void
 vdev_close(vdev_t *vd)
 {
-	spa_t *spa = vd->vdev_spa;
 	vdev_t *pvd = vd->vdev_parent;
+	ASSERTV(spa_t *spa = vd->vdev_spa);
 
 	ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
 
@@ -1795,8 +1795,7 @@ vdev_dtl_sync(vdev_t *vd, uint64_t txg)
 
 	if (vd->vdev_detached) {
 		if (smo->smo_object != 0) {
-			int err = dmu_object_free(mos, smo->smo_object, tx);
+			VERIFY(0 == dmu_object_free(mos, smo->smo_object, tx));
-			ASSERT3U(err, ==, 0);
 			smo->smo_object = 0;
 		}
 		dmu_tx_commit(tx);
@@ -3084,7 +3083,8 @@ vdev_load_log_state(vdev_t *nvd, vdev_t *ovd)
 	int c;
 
 	ASSERT(nvd->vdev_top->vdev_islog);
-	ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
+	ASSERT(spa_config_held(nvd->vdev_spa,
+	    SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
 	ASSERT3U(nvd->vdev_guid, ==, ovd->vdev_guid);
 
 	for (c = 0; c < nvd->vdev_children; c++)

module/zfs/vdev_cache.c

@@ -246,7 +246,7 @@ vdev_cache_read(zio_t *zio)
 	vdev_cache_t *vc = &zio->io_vd->vdev_cache;
 	vdev_cache_entry_t *ve, ve_search;
 	uint64_t cache_offset = P2ALIGN(zio->io_offset, VCBS);
-	uint64_t cache_phase = P2PHASE(zio->io_offset, VCBS);
+	ASSERTV(uint64_t cache_phase = P2PHASE(zio->io_offset, VCBS);)
 	zio_t *fio;
 
 	ASSERT(zio->io_type == ZIO_TYPE_READ);

module/zfs/zap_micro.c

@@ -937,7 +937,7 @@ mzap_addent(zap_name_t *zn, uint64_t value)
 
 #ifdef ZFS_DEBUG
 	for (i = 0; i < zap->zap_m.zap_num_chunks; i++) {
-		mzap_ent_phys_t *mze = &zap->zap_m.zap_phys->mz_chunk[i];
+		ASSERTV(mzap_ent_phys_t *mze=&zap->zap_m.zap_phys->mz_chunk[i]);
 		ASSERT(strcmp(zn->zn_key_orig, mze->mze_name) != 0);
 	}
 #endif
@@ -1043,12 +1043,13 @@ zap_update(objset_t *os, uint64_t zapobj, const char *name,
 {
 	zap_t *zap;
 	mzap_ent_t *mze;
-	uint64_t oldval;
 	const uint64_t *intval = val;
 	zap_name_t *zn;
 	int err;
 
 #ifdef ZFS_DEBUG
+	uint64_t oldval;
+
 	/*
 	 * If there is an old value, it shouldn't change across the
 	 * lockdir (eg, due to bprewrite's xlation).

module/zfs/zio.c

@@ -1634,7 +1634,7 @@ static void
 zio_write_gang_member_ready(zio_t *zio)
 {
 	zio_t *pio = zio_unique_parent(zio);
-	zio_t *gio = zio->io_gang_leader;
+	ASSERTV(zio_t *gio = zio->io_gang_leader;)
 	dva_t *cdva = zio->io_bp->blk_dva;
 	dva_t *pdva = pio->io_bp->blk_dva;
 	uint64_t asize;
@@ -1949,12 +1949,12 @@ static void
 zio_ddt_ditto_write_done(zio_t *zio)
 {
 	int p = DDT_PHYS_DITTO;
-	zio_prop_t *zp = &zio->io_prop;
 	blkptr_t *bp = zio->io_bp;
 	ddt_t *ddt = ddt_select(zio->io_spa, bp);
 	ddt_entry_t *dde = zio->io_private;
 	ddt_phys_t *ddp = &dde->dde_phys[p];
 	ddt_key_t *ddk = &dde->dde_key;
+	ASSERTV(zio_prop_t *zp = &zio->io_prop);
 
 	ddt_enter(ddt);