diff --git a/cmd/zdb/zdb_il.c b/cmd/zdb/zdb_il.c
index c12178eff..553765b71 100644
--- a/cmd/zdb/zdb_il.c
+++ b/cmd/zdb/zdb_il.c
@@ -62,9 +62,9 @@ print_log_bp(const blkptr_t *bp, const char *prefix)
 
 /* ARGSUSED */
 static void
-zil_prt_rec_create(zilog_t *zilog, int txtype, void *arg)
+zil_prt_rec_create(zilog_t *zilog, int txtype, const void *arg)
 {
-	lr_create_t *lr = arg;
+	const lr_create_t *lr = arg;
 	time_t crtime = lr->lr_crtime[0];
 	char *name, *link;
 	lr_attr_t *lrattr;
@@ -98,9 +98,9 @@ zil_prt_rec_create(zilog_t *zilog, int txtype, void *arg)
 
 /* ARGSUSED */
 static void
-zil_prt_rec_remove(zilog_t *zilog, int txtype, void *arg)
+zil_prt_rec_remove(zilog_t *zilog, int txtype, const void *arg)
 {
-	lr_remove_t *lr = arg;
+	const lr_remove_t *lr = arg;
 
 	(void) printf("%sdoid %llu, name %s\n", tab_prefix,
 	    (u_longlong_t)lr->lr_doid, (char *)(lr + 1));
@@ -108,9 +108,9 @@ zil_prt_rec_remove(zilog_t *zilog, int txtype, void *arg)
 
 /* ARGSUSED */
 static void
-zil_prt_rec_link(zilog_t *zilog, int txtype, void *arg)
+zil_prt_rec_link(zilog_t *zilog, int txtype, const void *arg)
 {
-	lr_link_t *lr = arg;
+	const lr_link_t *lr = arg;
 
 	(void) printf("%sdoid %llu, link_obj %llu, name %s\n", tab_prefix,
 	    (u_longlong_t)lr->lr_doid, (u_longlong_t)lr->lr_link_obj,
@@ -119,9 +119,9 @@ zil_prt_rec_link(zilog_t *zilog, int txtype, void *arg)
 
 /* ARGSUSED */
 static void
-zil_prt_rec_rename(zilog_t *zilog, int txtype, void *arg)
+zil_prt_rec_rename(zilog_t *zilog, int txtype, const void *arg)
 {
-	lr_rename_t *lr = arg;
+	const lr_rename_t *lr = arg;
 	char *snm = (char *)(lr + 1);
 	char *tnm = snm + strlen(snm) + 1;
 
@@ -148,11 +148,11 @@ zil_prt_rec_write_cb(void *data, size_t len, void *unused)
 
 /* ARGSUSED */
 static void
-zil_prt_rec_write(zilog_t *zilog, int txtype, void *arg)
+zil_prt_rec_write(zilog_t *zilog, int txtype, const void *arg)
 {
-	lr_write_t *lr = arg;
+	const lr_write_t *lr = arg;
 	abd_t *data;
-	blkptr_t *bp = &lr->lr_blkptr;
+	const blkptr_t *bp = &lr->lr_blkptr;
 	zbookmark_phys_t zb;
 	int verbose = MAX(dump_opt['d'], dump_opt['i']);
 	int error;
@@ -211,9 +211,9 @@ out:
 
 /* ARGSUSED */
 static void
-zil_prt_rec_truncate(zilog_t *zilog, int txtype, void *arg)
+zil_prt_rec_truncate(zilog_t *zilog, int txtype, const void *arg)
 {
-	lr_truncate_t *lr = arg;
+	const lr_truncate_t *lr = arg;
 
 	(void) printf("%sfoid %llu, offset 0x%llx, length 0x%llx\n", tab_prefix,
 	    (u_longlong_t)lr->lr_foid, (longlong_t)lr->lr_offset,
@@ -222,9 +222,9 @@ zil_prt_rec_truncate(zilog_t *zilog, int txtype, void *arg)
 
 /* ARGSUSED */
 static void
-zil_prt_rec_setattr(zilog_t *zilog, int txtype, void *arg)
+zil_prt_rec_setattr(zilog_t *zilog, int txtype, const void *arg)
 {
-	lr_setattr_t *lr = arg;
+	const lr_setattr_t *lr = arg;
 	time_t atime = (time_t)lr->lr_atime[0];
 	time_t mtime = (time_t)lr->lr_mtime[0];
 
@@ -268,15 +268,15 @@ zil_prt_rec_setattr(zilog_t *zilog, int txtype, void *arg)
 
 /* ARGSUSED */
 static void
-zil_prt_rec_acl(zilog_t *zilog, int txtype, void *arg)
+zil_prt_rec_acl(zilog_t *zilog, int txtype, const void *arg)
 {
-	lr_acl_t *lr = arg;
+	const lr_acl_t *lr = arg;
 
 	(void) printf("%sfoid %llu, aclcnt %llu\n", tab_prefix,
 	    (u_longlong_t)lr->lr_foid, (u_longlong_t)lr->lr_aclcnt);
 }
 
-typedef void (*zil_prt_rec_func_t)(zilog_t *, int, void *);
+typedef void (*zil_prt_rec_func_t)(zilog_t *, int, const void *);
 typedef struct zil_rec_info {
 	zil_prt_rec_func_t	zri_print;
 	const char		*zri_name;
@@ -309,7 +309,7 @@ static zil_rec_info_t zil_rec_info[TX_MAX_TYPE] = {
 
 /* ARGSUSED */
 static int
-print_log_record(zilog_t *zilog, lr_t *lr, void *arg, uint64_t claim_txg)
+print_log_record(zilog_t *zilog, const lr_t *lr, void *arg, uint64_t claim_txg)
 {
 	int txtype;
 	int verbose = MAX(dump_opt['d'], dump_opt['i']);
@@ -343,7 +343,8 @@ print_log_record(zilog_t *zilog, lr_t *lr, void *arg, uint64_t claim_txg)
 
 /* ARGSUSED */
 static int
-print_log_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg)
+print_log_block(zilog_t *zilog, const blkptr_t *bp, void *arg,
+    uint64_t claim_txg)
 {
 	char blkbuf[BP_SPRINTF_LEN + 10];
 	int verbose = MAX(dump_opt['d'], dump_opt['i']);
diff --git a/include/sys/zil.h b/include/sys/zil.h
index 7e61a1330..ec89de38d 100644
--- a/include/sys/zil.h
+++ b/include/sys/zil.h
@@ -462,9 +462,9 @@ extern zil_stats_t zil_stats;
 #define	ZIL_STAT_BUMP(stat) \
     ZIL_STAT_INCR(stat, 1);
 
-typedef int zil_parse_blk_func_t(zilog_t *zilog, blkptr_t *bp, void *arg,
+typedef int zil_parse_blk_func_t(zilog_t *zilog, const blkptr_t *bp, void *arg,
     uint64_t txg);
-typedef int zil_parse_lr_func_t(zilog_t *zilog, lr_t *lr, void *arg,
+typedef int zil_parse_lr_func_t(zilog_t *zilog, const lr_t *lr, void *arg,
     uint64_t txg);
 typedef int zil_replay_func_t(void *arg1, void *arg2, boolean_t byteswap);
 typedef int zil_get_data_t(void *arg, lr_write_t *lr, char *dbuf,
diff --git a/module/zfs/dmu_traverse.c b/module/zfs/dmu_traverse.c
index 83830fe39..31db49dae 100644
--- a/module/zfs/dmu_traverse.c
+++ b/module/zfs/dmu_traverse.c
@@ -73,7 +73,8 @@ static void prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *,
     uint64_t objset, uint64_t object);
 
 static int
-traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg)
+traverse_zil_block(zilog_t *zilog, const blkptr_t *bp, void *arg,
+    uint64_t claim_txg)
 {
 	traverse_data_t *td = arg;
 	zbookmark_phys_t zb;
@@ -93,7 +94,8 @@ traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg)
 }
 
 static int
-traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg)
+traverse_zil_record(zilog_t *zilog, const lr_t *lrc, void *arg,
+    uint64_t claim_txg)
 {
 	traverse_data_t *td = arg;
 
diff --git a/module/zfs/dsl_scan.c b/module/zfs/dsl_scan.c
index 0ebda2f77..4704781bf 100644
--- a/module/zfs/dsl_scan.c
+++ b/module/zfs/dsl_scan.c
@@ -1375,7 +1375,8 @@ typedef struct zil_scan_arg {
 
 /* ARGSUSED */
 static int
-dsl_scan_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg)
+dsl_scan_zil_block(zilog_t *zilog, const blkptr_t *bp, void *arg,
+    uint64_t claim_txg)
 {
 	zil_scan_arg_t *zsa = arg;
 	dsl_pool_t *dp = zsa->zsa_dp;
@@ -1405,15 +1406,16 @@ dsl_scan_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg)
 
 /* ARGSUSED */
 static int
-dsl_scan_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg)
+dsl_scan_zil_record(zilog_t *zilog, const lr_t *lrc, void *arg,
+    uint64_t claim_txg)
 {
 	if (lrc->lrc_txtype == TX_WRITE) {
 		zil_scan_arg_t *zsa = arg;
 		dsl_pool_t *dp = zsa->zsa_dp;
 		dsl_scan_t *scn = dp->dp_scan;
 		zil_header_t *zh = zsa->zsa_zh;
-		lr_write_t *lr = (lr_write_t *)lrc;
-		blkptr_t *bp = &lr->lr_blkptr;
+		const lr_write_t *lr = (const lr_write_t *)lrc;
+		const blkptr_t *bp = &lr->lr_blkptr;
 		zbookmark_phys_t zb;
 
 		ASSERT(!BP_IS_REDACTED(bp));
diff --git a/module/zfs/zil.c b/module/zfs/zil.c
index 9dc20ba14..632fef29b 100644
--- a/module/zfs/zil.c
+++ b/module/zfs/zil.c
@@ -432,7 +432,8 @@ done:
 
 /* ARGSUSED */
 static int
-zil_clear_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t first_txg)
+zil_clear_log_block(zilog_t *zilog, const blkptr_t *bp, void *tx,
+    uint64_t first_txg)
 {
 	ASSERT(!BP_IS_HOLE(bp));
 
@@ -454,13 +455,15 @@ zil_clear_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t first_txg)
 
 /* ARGSUSED */
 static int
-zil_noop_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t first_txg)
+zil_noop_log_record(zilog_t *zilog, const lr_t *lrc, void *tx,
+    uint64_t first_txg)
 {
 	return (0);
 }
 
 static int
-zil_claim_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t first_txg)
+zil_claim_log_block(zilog_t *zilog, const blkptr_t *bp, void *tx,
+    uint64_t first_txg)
 {
 	/*
 	 * Claim log block if not already committed and not already claimed.
@@ -476,7 +479,8 @@ zil_claim_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t first_txg)
 }
 
 static int
-zil_claim_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t first_txg)
+zil_claim_log_record(zilog_t *zilog, const lr_t *lrc, void *tx,
+    uint64_t first_txg)
 {
 	lr_write_t *lr = (lr_write_t *)lrc;
 	int error;
@@ -503,7 +507,8 @@ zil_claim_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t first_txg)
 
 /* ARGSUSED */
 static int
-zil_free_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t claim_txg)
+zil_free_log_block(zilog_t *zilog, const blkptr_t *bp, void *tx,
+    uint64_t claim_txg)
 {
 	zio_free(zilog->zl_spa, dmu_tx_get_txg(tx), bp);
 
@@ -511,7 +516,8 @@ zil_free_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t claim_txg)
 }
 
 static int
-zil_free_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t claim_txg)
+zil_free_log_record(zilog_t *zilog, const lr_t *lrc, void *tx,
+    uint64_t claim_txg)
 {
 	lr_write_t *lr = (lr_write_t *)lrc;
 	blkptr_t *bp = &lr->lr_blkptr;
@@ -3471,7 +3477,7 @@ typedef struct zil_replay_arg {
 } zil_replay_arg_t;
 
 static int
-zil_replay_error(zilog_t *zilog, lr_t *lr, int error)
+zil_replay_error(zilog_t *zilog, const lr_t *lr, int error)
 {
 	char name[ZFS_MAX_DATASET_NAME_LEN];
 
@@ -3489,7 +3495,8 @@ zil_replay_error(zilog_t *zilog, lr_t *lr, int error)
 }
 
 static int
-zil_replay_log_record(zilog_t *zilog, lr_t *lr, void *zra, uint64_t claim_txg)
+zil_replay_log_record(zilog_t *zilog, const lr_t *lr, void *zra,
+    uint64_t claim_txg)
 {
 	zil_replay_arg_t *zr = zra;
 	const zil_header_t *zh = zilog->zl_header;
@@ -3572,7 +3579,7 @@ zil_replay_log_record(zilog_t *zilog, lr_t *lr, void *zra, uint64_t claim_txg)
 
 /* ARGSUSED */
 static int
-zil_incr_blks(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg)
+zil_incr_blks(zilog_t *zilog, const blkptr_t *bp, void *arg, uint64_t claim_txg)
 {
 	zilog->zl_replay_blks++;