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block: always set bdev->bd_part

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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>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Tejun Heo 2008-08-25 19:56:12 +09:00 • committed by Jens Axboe
parent 4c46501d16
commit 0762b8bde9
5 changed files with 35 additions and 48 deletions
Download patch file Download diff file Expand all files Collapse all files

67
fs/block_dev.c
View file

@ -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)