---

yaml
---
r: 43757
b: refs/heads/master
c: c17bb49
h: refs/heads/master
i:
  43755: 0ca8a41
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 933e312e73f8fc39652bd4d216a5393cc3a014b9
+refs/heads/master: c17bb4951752d3e0f49cd1ea9d2e868422f9e0d6

trunk/block/genhd.c

@@ -417,13 +417,44 @@ static struct disk_attribute disk_attr_stat = {
 	.show	= disk_stats_read
 };
 
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+
+static ssize_t disk_fail_store(struct gendisk * disk,
+			       const char *buf, size_t count)
+{
+	int i;
+
+	if (count > 0 && sscanf(buf, "%d", &i) > 0) {
+		if (i == 0)
+			disk->flags &= ~GENHD_FL_FAIL;
+		else
+			disk->flags |= GENHD_FL_FAIL;
+	}
+
+	return count;
+}
+static ssize_t disk_fail_read(struct gendisk * disk, char *page)
+{
+	return sprintf(page, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0);
+}
+static struct disk_attribute disk_attr_fail = {
+	.attr = {.name = "make-it-fail", .mode = S_IRUGO | S_IWUSR },
+	.store	= disk_fail_store,
+	.show	= disk_fail_read
+};
+
+#endif
+
 static struct attribute * default_attrs[] = {
 	&disk_attr_uevent.attr,
 	&disk_attr_dev.attr,
 	&disk_attr_range.attr,
 	&disk_attr_removable.attr,
 	&disk_attr_size.attr,
 	&disk_attr_stat.attr,
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+	&disk_attr_fail.attr,
+#endif
 	NULL,
 };
 

trunk/block/ll_rw_blk.c

@@ -28,6 +28,7 @@
 #include <linux/interrupt.h>
 #include <linux/cpu.h>
 #include <linux/blktrace_api.h>
+#include <linux/fault-inject.h>
 
 /*
  * for max sense size
@@ -3056,6 +3057,42 @@ static void handle_bad_sector(struct bio *bio)
 	set_bit(BIO_EOF, &bio->bi_flags);
 }
 
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+
+static DECLARE_FAULT_ATTR(fail_make_request);
+
+static int __init setup_fail_make_request(char *str)
+{
+	return setup_fault_attr(&fail_make_request, str);
+}
+__setup("fail_make_request=", setup_fail_make_request);
+
+static int should_fail_request(struct bio *bio)
+{
+	if ((bio->bi_bdev->bd_disk->flags & GENHD_FL_FAIL) ||
+	    (bio->bi_bdev->bd_part && bio->bi_bdev->bd_part->make_it_fail))
+		return should_fail(&fail_make_request, bio->bi_size);
+
+	return 0;
+}
+
+static int __init fail_make_request_debugfs(void)
+{
+	return init_fault_attr_dentries(&fail_make_request,
+					"fail_make_request");
+}
+
+late_initcall(fail_make_request_debugfs);
+
+#else /* CONFIG_FAIL_MAKE_REQUEST */
+
+static inline int should_fail_request(struct bio *bio)
+{
+	return 0;
+}
+
+#endif /* CONFIG_FAIL_MAKE_REQUEST */
+
 /**
  * generic_make_request: hand a buffer to its device driver for I/O
  * @bio:  The bio describing the location in memory and on the device.
@@ -3141,6 +3178,9 @@ void generic_make_request(struct bio *bio)
 		if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)))
 			goto end_io;
 
+		if (should_fail_request(bio))
+			goto end_io;
+
 		/*
 		 * If this device has partitions, remap block n
 		 * of partition p to block n+start(p) of the disk.

trunk/fs/partitions/check.c

@@ -276,12 +276,39 @@ static struct part_attribute part_attr_stat = {
 	.show	= part_stat_read
 };
 
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+
+static ssize_t part_fail_store(struct hd_struct * p,
+			       const char *buf, size_t count)
+{
+	int i;
+
+	if (count > 0 && sscanf(buf, "%d", &i) > 0)
+		p->make_it_fail = (i == 0) ? 0 : 1;
+
+	return count;
+}
+static ssize_t part_fail_read(struct hd_struct * p, char *page)
+{
+	return sprintf(page, "%d\n", p->make_it_fail);
+}
+static struct part_attribute part_attr_fail = {
+	.attr = {.name = "make-it-fail", .mode = S_IRUGO | S_IWUSR },
+	.store	= part_fail_store,
+	.show	= part_fail_read
+};
+
+#endif
+
 static struct attribute * default_attrs[] = {
 	&part_attr_uevent.attr,
 	&part_attr_dev.attr,
 	&part_attr_start.attr,
 	&part_attr_size.attr,
 	&part_attr_stat.attr,
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+	&part_attr_fail.attr,
+#endif
 	NULL,
 };
 

trunk/include/linux/genhd.h

@@ -83,13 +83,17 @@ struct hd_struct {
 	struct kobject *holder_dir;
 	unsigned ios[2], sectors[2];	/* READs and WRITEs */
 	int policy, partno;
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+	int make_it_fail;
+#endif
 };
 
 #define GENHD_FL_REMOVABLE			1
 #define GENHD_FL_DRIVERFS			2
 #define GENHD_FL_CD				8
 #define GENHD_FL_UP				16
 #define GENHD_FL_SUPPRESS_PARTITION_INFO	32
+#define GENHD_FL_FAIL				64
 
 struct disk_stats {
 	unsigned long sectors[2];	/* READs and WRITEs */

trunk/lib/Kconfig.debug

@@ -431,6 +431,13 @@ config FAIL_PAGE_ALLOC
 	help
 	  This option provides fault-injection capabilitiy for alloc_pages().
 
+config FAIL_MAKE_REQUEST
+	bool "Fault-injection capabilitiy for disk IO"
+	depends on DEBUG_KERNEL
+	select FAULT_INJECTION
+	help
+	  This option provides fault-injection capabilitiy to disk IO.
+
 config FAULT_INJECTION_DEBUG_FS
 	bool "Debugfs entries for fault-injection capabilities"
 	depends on FAULT_INJECTION && SYSFS