The patch titled
fault-injection capability for disk IO
has been added to the -mm tree. Its filename is
fault-injection-capability-for-disk-io.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: fault-injection capability for disk IO
From: Akinobu Mita <akinobu.mita@xxxxxxxxx>
This patch provides fault-injection capability for disk IO.
Boot option:
fail_make_request=<probability>,<interval>,<space>,<times>
<interval> -- specifies the interval of failures.
<probability> -- specifies how often it should fail in percent.
<space> -- specifies the size of free space where disk IO can be issued
safely in bytes.
<times> -- specifies how many times failures may happen at most.
Debugfs:
/debug/fail_make_request/interval
/debug/fail_make_request/probability
/debug/fail_make_request/specifies
/debug/fail_make_request/times
Example:
fail_make_request=10,100,0,-1
echo 1 > /sys/blocks/hda/hda1/make-it-fail
generic_make_request() on /dev/hda1 fails once per 10 times.
Cc: Jens Axboe <axboe@xxxxxxx>
Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
block/genhd.c | 31 +++++++++++++++++++++++++++++++
block/ll_rw_blk.c | 40 ++++++++++++++++++++++++++++++++++++++++
fs/partitions/check.c | 27 +++++++++++++++++++++++++++
include/linux/genhd.h | 4 ++++
lib/Kconfig.debug | 7 +++++++
5 files changed, 109 insertions(+)
diff -puN block/genhd.c~fault-injection-capability-for-disk-io block/genhd.c
--- a/block/genhd.c~fault-injection-capability-for-disk-io
+++ a/block/genhd.c
@@ -417,6 +417,34 @@ static struct disk_attribute disk_attr_s
.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,
@@ -424,6 +452,9 @@ static struct attribute * default_attrs[
&disk_attr_removable.attr,
&disk_attr_size.attr,
&disk_attr_stat.attr,
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+ &disk_attr_fail.attr,
+#endif
NULL,
};
diff -puN block/ll_rw_blk.c~fault-injection-capability-for-disk-io block/ll_rw_blk.c
--- a/block/ll_rw_blk.c~fault-injection-capability-for-disk-io
+++ a/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
@@ -2974,6 +2975,42 @@ static void handle_bad_sector(struct 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.
@@ -3059,6 +3096,9 @@ end_io:
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.
diff -puN fs/partitions/check.c~fault-injection-capability-for-disk-io fs/partitions/check.c
--- a/fs/partitions/check.c~fault-injection-capability-for-disk-io
+++ a/fs/partitions/check.c
@@ -276,12 +276,39 @@ static struct part_attribute part_attr_s
.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,
};
diff -puN include/linux/genhd.h~fault-injection-capability-for-disk-io include/linux/genhd.h
--- a/include/linux/genhd.h~fault-injection-capability-for-disk-io
+++ a/include/linux/genhd.h
@@ -83,6 +83,9 @@ 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
@@ -90,6 +93,7 @@ struct hd_struct {
#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 */
diff -puN lib/Kconfig.debug~fault-injection-capability-for-disk-io lib/Kconfig.debug
--- a/lib/Kconfig.debug~fault-injection-capability-for-disk-io
+++ a/lib/Kconfig.debug
@@ -432,6 +432,13 @@ 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
_
Patches currently in -mm which might be from akinobu.mita@xxxxxxxxx are
acpi-fix-single-linked-list-manipulation.patch
debugfs-check-return-value-correctly.patch
git-input.patch
git-mtd.patch
gss_spkm3-fix-error-handling-in-module-init.patch
auth_gss-unregister-gss_domain-when-unloading-module.patch
auth_gss-unregister-gss_domain-when-unloading-module-fix.patch
git-pcmcia.patch
pci-fix-__pci_register_driver-error-handling.patch
acpiphp-fix-missing-acpiphp_glue_exit.patch
acpiphp-fix-use-of-list_for_each-macro.patch
git-watchdog.patch
paride-return-proper-error-code.patch
bit-revese-library.patch
crc32-replace-bitreverse-by-bitrev32.patch
video-use-bitrev8.patch
net-use-bitrev8.patch
isdn-hisax-use-bitrev8.patch
atm-ambassador-use-bitrev8.patch
isdn-gigaset-use-bitrev8.patch
isdn-fix-missing-unregister_capi_driver.patch
fault-injection-documentation-and-scripts.patch
fault-injection-capabilities-infrastructure.patch
fault-injection-capabilities-infrastructure-tidy.patch
fault-injection-capabilities-infrastructure-tweaks.patch
fault-injection-capability-for-kmalloc.patch
fault-injection-capability-for-alloc_pages.patch
fault-injection-capability-for-disk-io.patch
fault-injection-process-filtering-for-fault-injection-capabilities.patch
fault-injection-stacktrace-filtering.patch
fault-injection-Kconfig-cleanup.patch
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