11.1/linprocfs-diskstats.diff

Implement proc/diskstats as Linux 2.6+.

diff -ru --exclude-from freebsd-src-diff-exclude-names /usr/src/sys/compat/linprocfs/linprocfs.c freebsd-11.1/sys/compat/linprocfs/linprocfs.c
--- /usr/src/sys/compat/linprocfs/linprocfs.c	2017-07-21 07:42:01.000000000 +0800
+++ freebsd-11.1/sys/compat/linprocfs/linprocfs.c	2020-12-24 17:36:25.377847338 +0800
@@ -77,7 +84,7 @@
 #include <sys/vmmeter.h>
 #include <sys/vnode.h>
 #include <sys/bus.h>
-
+#include <sys/devicestat.h>
 #include <net/if.h>
 #include <net/if_var.h>
 #include <net/if_types.h>
@@ -94,6 +101,9 @@
 
 #include <geom/geom.h>
 #include <geom/geom_int.h>
+#ifdef LINPROCFS_HACK_GEOM_DISK_STAT
+#include <geom/geom_disk.h>
+#endif
 
 #if defined(__i386__) || defined(__amd64__)
 #include <machine/cputypes.h>
@@ -118,6 +128,7 @@
 #define P2B(x) ((x) << PAGE_SHIFT)			/* pages to bytes */
 #define P2K(x) ((x) << (PAGE_SHIFT - 10))		/* pages to kbytes */
 #define TV2J(x)	((x)->tv_sec * 100UL + (x)->tv_usec / 10000)
+#define BINTIME2MSEC(_bt) ((unsigned long int)((_bt)->sec * 1000 + (((uint64_t)1000 * (uint32_t)((_bt)->frac >> 32)) >> 32)))
 
 /**
  * @brief Mapping of ki_stat in struct kinfo_proc to the linux state
@@ -394,6 +402,69 @@
 	return (0);
 }
 
+/*
+ * Filler function for proc/diskstats
+ */
+static int
+linprocfs_dodiskstats(PFS_FILL_ARGS)
+{
+	struct g_class *cp;
+	struct g_geom *gp;
+	struct g_provider *pp;
+
+	g_topology_lock();
+	LIST_FOREACH(cp, &g_classes, class) {
+		if(strcmp(cp->name, "DISK") && strcmp(cp->name, "MD") && strcmp(cp->name, "ZFS::ZVOL")) {
+			continue;
+		}
+		LIST_FOREACH(gp, &cp->geom, geom) {
+			LIST_FOREACH(pp, &gp->provider, provider) {
+				int major, minor;
+				if (linux_driver_get_major_minor(
+				    pp->name, &major, &minor) != 0) {
+					major = 0;
+					minor = 0;
+				}
+				const struct devstat *stat = pp->stat;
+#ifdef LINPROCFS_HACK_GEOM_DISK_STAT
+				if(!stat && strcmp(cp->name, "DISK") == 0 && pp->private) {
+					// XXX
+					struct g_disk_softc {
+						struct mtx done_mtx;
+						struct disk *dp;
+					} *sc = pp->private;
+					stat = sc->dp->d_devstat;
+				}
+#endif
+				if(stat) {
+					uint32_t block_size = stat->block_size;
+					if(!block_size) block_size = 512;
+					sbuf_printf(sb, "%4d %7d %s %lu %lu "
+						"%lu %lu %lu %lu %lu %lu "
+						"%u %lu %lu\n",
+						major, minor, pp->name,
+						(unsigned long int)stat->operations[DEVSTAT_READ],
+						0UL,
+						(unsigned long int)(stat->bytes[DEVSTAT_READ] / block_size),
+						BINTIME2MSEC(stat->duration + DEVSTAT_READ),
+						(unsigned long int)stat->operations[DEVSTAT_WRITE],
+						0UL,
+						(unsigned long int)(stat->bytes[DEVSTAT_WRITE] / block_size),
+						BINTIME2MSEC(stat->duration + DEVSTAT_WRITE),
+						stat->start_count - stat->end_count,
+						BINTIME2MSEC(&stat->busy_time),
+						BINTIME2MSEC(&stat->busy_time));
+				} else {
+					sbuf_printf(sb, "%4d %7d %s 0 0 0 0 0 0 0 0 0 0 0\n",
+						major, minor, pp->name);
+				}
+			}
+		}
+	}
+	g_topology_unlock();
+
+	return 0;
+}
 
 /*
  * Filler function for proc/stat
@@ -1497,6 +1578,8 @@
 	    NULL, NULL, NULL, PFS_RD);
 	pfs_create_file(root, "devices", &linprocfs_dodevices,
 	    NULL, NULL, NULL, PFS_RD);
+	pfs_create_file(root, "diskstats", &linprocfs_dodiskstats,
+	    NULL, NULL, NULL, PFS_RD);
 	pfs_create_file(root, "filesystems", &linprocfs_dofilesystems,
 	    NULL, NULL, NULL, PFS_RD);
 	pfs_create_file(root, "loadavg", &linprocfs_doloadavg,