From 8701a8bfa6592fd2f251f77e3988d809578ecac4 Mon Sep 17 00:00:00 2001
From: Shashank Kumar <75466339+datacore-skumar@users.noreply.github.com>
Date: Tue, 17 May 2022 16:59:23 +0530
Subject: [PATCH] l2_arc alloc details in ioctl

---
 include/sys/zfs_ioctl.h              | 1 +
 module/os/windows/spl/spl-kstat.c    | 5 +++++
 module/os/windows/zfs/zfs_ioctl_os.c | 8 ++++++++
 3 files changed, 14 insertions(+)

diff --git a/include/sys/zfs_ioctl.h b/include/sys/zfs_ioctl.h
index 30dfd1b3818d..e8b25e779a2e 100644
--- a/include/sys/zfs_ioctl.h
+++ b/include/sys/zfs_ioctl.h
@@ -594,6 +594,7 @@ typedef struct {
 
     char zpoolHealthState[MAXNAMELEN];
     char name[MAXNAMELEN];
+    unsigned __int64	l2arc_alloc_size;
 }zpool_zfs_metrics;
 
 typedef struct {
diff --git a/module/os/windows/spl/spl-kstat.c b/module/os/windows/spl/spl-kstat.c
index 5463100c663e..acf95b424289 100644
--- a/module/os/windows/spl/spl-kstat.c
+++ b/module/os/windows/spl/spl-kstat.c
@@ -2261,6 +2261,11 @@ int spl_kstat_write(PDEVICE_OBJECT DiskDevice, PIRP Irp,
 	return (0);
 }
 
+uint64_t
+l2_arc_alloc(arc_stats_t* arc_ptr) {
+    return arc_ptr->arcstat_l2_psize.value.ui64;
+}
+
 // Added comments inline referring to perl arcstat.pl
 void
 arc_cache_counters_perfmon(cache_counters* perf, arc_stats_t* arc_ptr)
diff --git a/module/os/windows/zfs/zfs_ioctl_os.c b/module/os/windows/zfs/zfs_ioctl_os.c
index b46a08f53c9c..688c9fd33a2d 100644
--- a/module/os/windows/zfs/zfs_ioctl_os.c
+++ b/module/os/windows/zfs/zfs_ioctl_os.c
@@ -88,6 +88,7 @@ zfs_vfs_ref(zfsvfs_t **zfvp)
 	return (error);
 }
 
+extern kstat_t* perf_arc_ksp;
 NTSTATUS zpool_zfs_get_metrics(PDEVICE_OBJECT DeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp)
 {
     Irp->IoStatus.Information = 0;
@@ -112,6 +113,7 @@ NTSTATUS zpool_zfs_get_metrics(PDEVICE_OBJECT DeviceObject, PIRP Irp, PIO_STACK_
     perf->zpool_size = 0;
     perf->zfs_volSize = 0;
     strncpy(perf->zpoolHealthState, "", sizeof(perf->zpoolHealthState));
+    perf->l2arc_alloc_size = 0;
 
     perf->used = getUsedData(perf->name);
     perf->compress_ratio = getCompressRatio(perf->name);
@@ -141,6 +143,12 @@ NTSTATUS zpool_zfs_get_metrics(PDEVICE_OBJECT DeviceObject, PIRP Irp, PIO_STACK_
     else
 	perf->zfs_volSize = getZvolSize(perf->name);
 
+    KSTAT_ENTER(perf_arc_ksp);
+    int error = KSTAT_UPDATE(perf_arc_ksp, KSTAT_READ);
+    if (!error)
+	perf->l2arc_alloc_size = l2_arc_alloc(perf_arc_ksp->ks_data);
+    KSTAT_EXIT(perf_arc_ksp);
+
     Irp->IoStatus.Information = sizeof(zpool_zfs_metrics);
     return STATUS_SUCCESS;
 }