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Subject[PATCH 07/13] block: move holder_dir from disk to part0
Date
Move disk->holder_dir to part0->holder_dir.  Kill now mostly
superflous bdev_get_holder().

While at it, kill superflous kobject_get/put() around holder_dir,
slave_dir and cmd_filter creation and collapse
disk_sysfs_add_subdirs() into register_disk(). These serve no purpose
but obfuscating the code.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
block/cmd-filter.c | 12 +++---------
fs/block_dev.c | 10 +---------
fs/partitions/check.c | 15 +++------------
include/linux/genhd.h | 1 -
4 files changed, 7 insertions(+), 31 deletions(-)
diff --git a/block/cmd-filter.c b/block/cmd-filter.c
index eec4404..1ab98b2 100644
--- a/block/cmd-filter.c
+++ b/block/cmd-filter.c
@@ -309,14 +309,10 @@ int blk_register_filter(struct gendisk *disk)
{
int ret;
struct blk_scsi_cmd_filter *filter = &disk->cmd_filter;
- struct kobject *parent = kobject_get(disk->holder_dir->parent);
-
- if (!parent)
- return -ENODEV;
-
- ret = kobject_init_and_add(&filter->kobj, &rcf_ktype, parent,
- "%s", "cmd_filter");

+ ret = kobject_init_and_add(&filter->kobj, &rcf_ktype,
+ &disk_to_dev(disk)->kobj,
+ "%s", "cmd_filter");
if (ret < 0)
return ret;

@@ -329,6 +325,4 @@ void blk_unregister_filter(struct gendisk *disk)
struct blk_scsi_cmd_filter *filter = &disk->cmd_filter;

kobject_put(&filter->kobj);
- kobject_put(disk->holder_dir->parent);
}
-
diff --git a/fs/block_dev.c b/fs/block_dev.c
index c982a91..57d5726 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -548,14 +548,6 @@ static struct kobject *bdev_get_kobj(struct block_device *bdev)
return kobject_get(&disk_to_dev(bdev->bd_disk)->kobj);
}

-static struct kobject *bdev_get_holder(struct block_device *bdev)
-{
- if (bdev->bd_contains != bdev)
- return kobject_get(bdev->bd_part->holder_dir);
- else
- return kobject_get(bdev->bd_disk->holder_dir);
-}
-
static int add_symlink(struct kobject *from, struct kobject *to)
{
if (!from || !to)
@@ -608,7 +600,7 @@ static int bd_holder_grab_dirs(struct block_device *bdev,
if (!bo->sdev)
goto fail_put_hdev;

- bo->hdir = bdev_get_holder(bdev);
+ bo->hdir = kobject_get(bdev->bd_part->holder_dir);
if (!bo->hdir)
goto fail_put_sdev;

diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index cb9ec77..7e4a7d4 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -305,16 +305,6 @@ struct device_type part_type = {
.release = part_release,
};

-static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
-{
- struct kobject *k;
-
- k = kobject_get(&disk_to_dev(disk)->kobj);
- disk->holder_dir = kobject_create_and_add("holders", k);
- disk->slave_dir = kobject_create_and_add("slaves", k);
- kobject_put(k);
-}
-
static void delete_partition_rcu_cb(struct rcu_head *head)
{
struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
@@ -464,7 +454,8 @@ void register_disk(struct gendisk *disk)
return;
}
#endif
- disk_sysfs_add_subdirs(disk);
+ disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
+ disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);

/* No minors to use for partitions */
if (!disk_partitionable(disk))
@@ -592,7 +583,7 @@ void del_gendisk(struct gendisk *disk)
disk_stat_set_all(disk, 0);
disk->stamp = 0;

- kobject_put(disk->holder_dir);
+ kobject_put(disk->part0.holder_dir);
kobject_put(disk->slave_dir);
disk->driverfs_dev = NULL;
#ifndef CONFIG_SYSFS_DEPRECATED
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 461ba6d..a8573ba 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -151,7 +151,6 @@ struct gendisk {

int flags;
struct device *driverfs_dev; // FIXME: remove
- struct kobject *holder_dir;
struct kobject *slave_dir;

struct timer_rand_state *random;
--
1.5.4.5


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