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Subject[PATCH 08/13] block: always set bdev->bd_part
Date
Till now, bdev->bd_part is set only if the bdev was for parts other
than part0. This patch makes bdev->bd_part always set so that code
paths don't have to differenciate common handling.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
block/blk-core.c | 2 +-
drivers/md/md.c | 5 +---
fs/block_dev.c | 67 ++++++++++++++++++++++--------------------------
fs/partitions/check.c | 7 +----
include/linux/genhd.h | 2 +-
5 files changed, 35 insertions(+), 48 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 3de5610..09bba70 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1272,7 +1272,7 @@ __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))
+ bio->bi_bdev->bd_part->make_it_fail)
return should_fail(&fail_make_request, bio->bi_size);

return 0;
diff --git a/drivers/md/md.c b/drivers/md/md.c
index c815b9e..5d0cf63 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1464,10 +1464,7 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
goto fail;

- if (rdev->bdev->bd_part)
- ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
- else
- ko = &disk_to_dev(rdev->bdev->bd_disk)->kobj;
+ ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
kobject_del(&rdev->kobj);
goto fail;
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 57d5726..c3fa19b 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -540,14 +540,6 @@ EXPORT_SYMBOL(bd_release);
* /sys/block/sda/holders/dm-0 --> /sys/block/dm-0
*/

-static struct kobject *bdev_get_kobj(struct block_device *bdev)
-{
- if (bdev->bd_contains != bdev)
- return kobject_get(&part_to_dev(bdev->bd_part)->kobj);
- else
- return kobject_get(&disk_to_dev(bdev->bd_disk)->kobj);
-}
-
static int add_symlink(struct kobject *from, struct kobject *to)
{
if (!from || !to)
@@ -596,7 +588,7 @@ static int bd_holder_grab_dirs(struct block_device *bdev,
if (!bo->hdev)
goto fail_put_sdir;

- bo->sdev = bdev_get_kobj(bdev);
+ bo->sdev = kobject_get(&part_to_dev(bdev->bd_part)->kobj);
if (!bo->sdev)
goto fail_put_hdev;

@@ -919,7 +911,6 @@ static int __blkdev_put(struct block_device *bdev, int for_part);

static int do_open(struct block_device *bdev, struct file *file, int for_part)
{
- struct module *owner = NULL;
struct gendisk *disk;
struct hd_struct *part = NULL;
int ret;
@@ -941,25 +932,27 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)

ret = -ENXIO;
file->f_mapping = bdev->bd_inode->i_mapping;
+
lock_kernel();
+
disk = get_gendisk(bdev->bd_dev, &partno);
- if (!disk) {
- unlock_kernel();
- bdput(bdev);
- return ret;
- }
- owner = disk->fops->owner;
+ if (!disk)
+ goto out_unlock_kernel;
+ part = disk_get_part(disk, partno);
+ if (!part)
+ goto out_unlock_kernel;

mutex_lock_nested(&bdev->bd_mutex, for_part);
if (!bdev->bd_openers) {
bdev->bd_disk = disk;
+ bdev->bd_part = part;
bdev->bd_contains = bdev;
if (!partno) {
struct backing_dev_info *bdi;
if (disk->fops->open) {
ret = disk->fops->open(bdev->bd_inode, file);
if (ret)
- goto out_first;
+ goto out_clear;
}
if (!bdev->bd_openers) {
bd_set_size(bdev,(loff_t)get_capacity(disk)<<9);
@@ -975,31 +968,32 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
whole = bdget_disk(disk, 0);
ret = -ENOMEM;
if (!whole)
- goto out_first;
+ goto out_clear;
BUG_ON(for_part);
ret = __blkdev_get(whole, file->f_mode, file->f_flags, 1);
if (ret)
- goto out_first;
+ goto out_clear;
bdev->bd_contains = whole;
- part = disk_get_part(disk, partno);
bdev->bd_inode->i_data.backing_dev_info =
whole->bd_inode->i_data.backing_dev_info;
if (!(disk->flags & GENHD_FL_UP) ||
!part || !part->nr_sects) {
ret = -ENXIO;
- goto out_first;
+ goto out_clear;
}
- bdev->bd_part = part;
bd_set_size(bdev, (loff_t)part->nr_sects << 9);
}
} else {
+ disk_put_part(part);
put_disk(disk);
- module_put(owner);
+ module_put(disk->fops->owner);
+ part = NULL;
+ disk = NULL;
if (bdev->bd_contains == bdev) {
if (bdev->bd_disk->fops->open) {
ret = bdev->bd_disk->fops->open(bdev->bd_inode, file);
if (ret)
- goto out;
+ goto out_unlock_bdev;
}
if (bdev->bd_invalidated)
rescan_partitions(bdev->bd_disk, bdev);
@@ -1012,20 +1006,24 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
unlock_kernel();
return 0;

-out_first:
+ out_clear:
bdev->bd_disk = NULL;
+ bdev->bd_part = NULL;
bdev->bd_inode->i_data.backing_dev_info = &default_backing_dev_info;
if (bdev != bdev->bd_contains)
__blkdev_put(bdev->bd_contains, 1);
bdev->bd_contains = NULL;
- put_disk(disk);
- disk_put_part(part);
- module_put(owner);
-out:
+ out_unlock_bdev:
mutex_unlock(&bdev->bd_mutex);
+ out_unlock_kernel:
unlock_kernel();
- if (ret)
- bdput(bdev);
+
+ disk_put_part(part);
+ if (disk)
+ module_put(disk->fops->owner);
+ put_disk(disk);
+ bdput(bdev);
+
return ret;
}

@@ -1110,11 +1108,8 @@ static int __blkdev_put(struct block_device *bdev, int for_part)

put_disk(disk);
module_put(owner);
-
- if (bdev->bd_contains != bdev) {
- disk_put_part(bdev->bd_part);
- bdev->bd_part = NULL;
- }
+ disk_put_part(bdev->bd_part);
+ bdev->bd_part = NULL;
bdev->bd_disk = NULL;
bdev->bd_inode->i_data.backing_dev_info = &default_backing_dev_info;
if (bdev != bdev->bd_contains)
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 7e4a7d4..f99dd96 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -134,12 +134,7 @@ char *disk_name(struct gendisk *hd, int partno, char *buf)

const char *bdevname(struct block_device *bdev, char *buf)
{
- int partno = 0;
-
- if (bdev->bd_part)
- partno = bdev->bd_part->partno;
-
- return disk_name(bdev->bd_disk, partno, buf);
+ return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
}

EXPORT_SYMBOL(bdevname);
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index a8573ba..0743324 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -422,7 +422,7 @@ extern void rand_initialize_disk(struct gendisk *disk);

static inline sector_t get_start_sect(struct block_device *bdev)
{
- return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
+ return bdev->bd_part->start_sect;
}
static inline sector_t get_capacity(struct gendisk *disk)
{
--
1.5.4.5


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