[LTP] [PATCH v2 25/31] testcases: sysfs: Add sys_block_queue01

A test for /sys/block/*/queue/* files.

Signed-off-by: Cyril Hrubis <[email protected]>
---
 runtest/sysfs                                 |   1 +
 testcases/kernel/sysfs/block/.gitignore       |   1 +
 .../kernel/sysfs/block/sys_block_queue01.c    | 106 ++++++++++++++++++
 3 files changed, 108 insertions(+)
 create mode 100644 testcases/kernel/sysfs/block/sys_block_queue01.c

diff --git a/runtest/sysfs b/runtest/sysfs
index 26a229f03..f7d35e0c2 100644
--- a/runtest/sysfs
+++ b/runtest/sysfs
@@ -20,3 +20,4 @@ sys_net02 sys_net02
 sys_net03 sys_net03
 sys_net04 sys_net04
 sys_block_loop01 sys_block_loop01
+sys_block_queue01 sys_block_queue01
diff --git a/testcases/kernel/sysfs/block/.gitignore b/testcases/kernel/sysfs/block/.gitignore
index c64e99087..c7011b79f 100644
--- a/testcases/kernel/sysfs/block/.gitignore
+++ b/testcases/kernel/sysfs/block/.gitignore
@@ -1 +1,2 @@
 /sys_block_loop01
+/sys_block_queue01
diff --git a/testcases/kernel/sysfs/block/sys_block_queue01.c b/testcases/kernel/sysfs/block/sys_block_queue01.c
new file mode 100644
index 000000000..4f2bb732d
--- /dev/null
+++ b/testcases/kernel/sysfs/block/sys_block_queue01.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2026 Cyril Hrubis <[email protected]>
+ */
+
+/*\
+ * Sanity checks for the per block device request queue attributes exported
+ * under /sys/block/<dev>/queue/.
+ *
+ * For every block device that exports a request queue the test verifies that:
+ *
+ * - logical_block_size and physical_block_size are powers of two
+ * - logical_block_size <= physical_block_size
+ * - hw_sector_size equals logical_block_size
+ * - max_sectors_kb <= max_hw_sectors_kb
+ * - read_ahead_kb, nr_requests and discard_max_bytes are non-negative
+ * - nr_requests is greater than zero
+ * - rotational, add_random, iostats are boolean (0 or 1)
+ * - scheduler is a valid bracketed-choice file with exactly one active scheduler
+ *
+ * All checks skip gracefully with TCONF when a particular attribute is not
+ * present, since the set of exported queue attributes differs between kernel
+ * versions and device types.
+ */
+
+#include <string.h>
+#include <dirent.h>
+#include <limits.h>
+#include "tst_test.h"
+#include "tst_sysfs_assert.h"
+
+#define SYS_BLOCK "/sys/block"
+
+/* schedulers that have existed in mainline over time */
+static const char *const sched_allowed[] = {
+	"none", "noop", "deadline", "mq-deadline", "cfq",
+	"kyber", "bfq", "anticipatory", NULL
+};
+
+static void check_cross(const char *dev)
+{
+	TST_SYSFS_ASSERT_LE_SUFFIX("logical_block_size", "physical_block_size",
+				   SYS_BLOCK "/%s/queue/", dev);
+
+	TST_SYSFS_ASSERT_EQ_SUFFIX("logical_block_size", "hw_sector_size",
+				   SYS_BLOCK "/%s/queue/", dev);
+
+	TST_SYSFS_ASSERT_LE_SUFFIX("max_sectors_kb", "max_hw_sectors_kb",
+				   SYS_BLOCK "/%s/queue/", dev);
+}
+
+static void check_device(const char *dev)
+{
+	char sched[64];
+
+	tst_res(TINFO, "Checking block device '%s'", dev);
+
+	TST_SYSFS_ASSERT_POW2(SYS_BLOCK "/%s/queue/logical_block_size", dev);
+	TST_SYSFS_ASSERT_POW2(SYS_BLOCK "/%s/queue/physical_block_size", dev);
+
+	TST_SYSFS_ASSERT_RANGELL(0, LONG_MAX,
+			       SYS_BLOCK "/%s/queue/read_ahead_kb", dev);
+	TST_SYSFS_ASSERT_RANGELL(1, LONG_MAX,
+			       SYS_BLOCK "/%s/queue/nr_requests", dev);
+	TST_SYSFS_ASSERT_RANGEUU(0, ULLONG_MAX,
+			       SYS_BLOCK "/%s/queue/discard_max_bytes", dev);
+
+	TST_SYSFS_ASSERT_BOOL(SYS_BLOCK "/%s/queue/rotational", dev);
+	TST_SYSFS_ASSERT_BOOL(SYS_BLOCK "/%s/queue/add_random", dev);
+	TST_SYSFS_ASSERT_BOOL(SYS_BLOCK "/%s/queue/iostats", dev);
+
+	TST_SYSFS_ASSERT_CHOICE(sched_allowed, sched, sizeof(sched),
+				SYS_BLOCK "/%s/queue/scheduler", dev);
+
+	check_cross(dev);
+}
+
+static void run(void)
+{
+	DIR *dir;
+	struct dirent *ent;
+	int found = 0;
+
+	dir = SAFE_OPENDIR(SYS_BLOCK);
+
+	while ((ent = SAFE_READDIR(dir))) {
+		if (ent->d_name[0] == '.')
+			continue;
+
+		/* Only devices that export a request queue are of interest. */
+		if (!tst_sysfs_exists(SYS_BLOCK "/%s/queue", ent->d_name))
+			continue;
+
+		found = 1;
+		check_device(ent->d_name);
+	}
+
+	SAFE_CLOSEDIR(dir);
+
+	if (!found)
+		tst_res(TCONF, "No block device with a request queue found");
+}
+
+static struct tst_test test = {
+	.test_all = run,
+};
-- 
2.54.0


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