block: always set bdev->bd_part
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>
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 @@
* /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 @@
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 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 @@
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 @@
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 @@
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 @@
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)