block: kill GENHD_FL_FAIL and use part0->make_it_fail

GENHD_FL_FAIL for disk is what make_it_fail is for parts.  Kill it and
use part0->make_it_fail.  Sysfs node handling is unified too.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

4 files changed, 16 insertions, 37 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index a4a7c08d2f20..505ec61067df 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1273,8 +1273,9 @@ __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->make_it_fail)
+        struct hd_struct *part = bio->bi_bdev->bd_part;
+
+        if (part_to_disk(part)->part0.make_it_fail || part->make_it_fail)
                 return should_fail(&fail_make_request, bio->bi_size);
 
         return 0;
diff --git a/block/genhd.c b/block/genhd.c
index 70358f3c7423..06a252f2b967 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -795,34 +795,6 @@ static ssize_t disk_stat_show(struct device *dev,
                 jiffies_to_msecs(disk_stat_read(disk, time_in_queue)));
 }
 
-#ifdef CONFIG_FAIL_MAKE_REQUEST
-static ssize_t disk_fail_show(struct device *dev,
-                              struct device_attribute *attr, char *buf)
-{
-        struct gendisk *disk = dev_to_disk(dev);
-
-        return sprintf(buf, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0);
-}
-
-static ssize_t disk_fail_store(struct device *dev,
-                               struct device_attribute *attr,
-                               const char *buf, size_t count)
-{
-        struct gendisk *disk = dev_to_disk(dev);
-        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;
-}
-
-#endif
-
 static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL);
 static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL);
 static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL);
@@ -832,7 +804,7 @@ static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL);
 static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL);
 #ifdef CONFIG_FAIL_MAKE_REQUEST
 static struct device_attribute dev_attr_fail =
-        __ATTR(make-it-fail, S_IRUGO|S_IWUSR, disk_fail_show, disk_fail_store);
+        __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
 #endif
 
 static struct attribute *disk_attrs[] = {
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 87298c0fc8ce..60592d9f43b6 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -238,17 +238,17 @@ static ssize_t part_stat_show(struct device *dev,
 }
 
 #ifdef CONFIG_FAIL_MAKE_REQUEST
-static ssize_t part_fail_show(struct device *dev,
-                              struct device_attribute *attr, char *buf)
+ssize_t part_fail_show(struct device *dev,
+                       struct device_attribute *attr, char *buf)
 {
         struct hd_struct *p = dev_to_part(dev);
 
         return sprintf(buf, "%d\n", p->make_it_fail);
 }
 
-static ssize_t part_fail_store(struct device *dev,
-                               struct device_attribute *attr,
-                               const char *buf, size_t count)
+ssize_t part_fail_store(struct device *dev,
+                        struct device_attribute *attr,
+                        const char *buf, size_t count)
 {
         struct hd_struct *p = dev_to_part(dev);
         int i;
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 45a3682b5d87..3d15b42dc352 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -112,7 +112,6 @@ 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 gendisk {
         /* major, first_minor, minors and ext_minors are input
@@ -596,6 +595,13 @@ extern void blk_unregister_region(dev_t devt, unsigned long range);
 
 extern ssize_t part_size_show(struct device *dev,
                               struct device_attribute *attr, char *buf);
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+extern ssize_t part_fail_show(struct device *dev,
+                              struct device_attribute *attr, char *buf);
+extern ssize_t part_fail_store(struct device *dev,
+                               struct device_attribute *attr,
+                               const char *buf, size_t count);
+#endif /* CONFIG_FAIL_MAKE_REQUEST */
 
 #else /* CONFIG_BLOCK */