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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>
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4c46501d16
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0762b8bde9
@ -1274,7 +1274,7 @@ __setup("fail_make_request=", setup_fail_make_request);
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static int should_fail_request(struct bio *bio)
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{
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if ((bio->bi_bdev->bd_disk->flags & GENHD_FL_FAIL) ||
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(bio->bi_bdev->bd_part && bio->bi_bdev->bd_part->make_it_fail))
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bio->bi_bdev->bd_part->make_it_fail)
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return should_fail(&fail_make_request, bio->bi_size);
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return 0;
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@ -1464,10 +1464,7 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
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if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
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goto fail;
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if (rdev->bdev->bd_part)
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ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
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else
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ko = &disk_to_dev(rdev->bdev->bd_disk)->kobj;
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ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
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if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
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kobject_del(&rdev->kobj);
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goto fail;
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@ -540,14 +540,6 @@ EXPORT_SYMBOL(bd_release);
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* /sys/block/sda/holders/dm-0 --> /sys/block/dm-0
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*/
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static struct kobject *bdev_get_kobj(struct block_device *bdev)
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{
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if (bdev->bd_contains != bdev)
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return kobject_get(&part_to_dev(bdev->bd_part)->kobj);
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else
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return kobject_get(&disk_to_dev(bdev->bd_disk)->kobj);
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}
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static int add_symlink(struct kobject *from, struct kobject *to)
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{
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if (!from || !to)
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@ -596,7 +588,7 @@ static int bd_holder_grab_dirs(struct block_device *bdev,
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if (!bo->hdev)
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goto fail_put_sdir;
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bo->sdev = bdev_get_kobj(bdev);
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bo->sdev = kobject_get(&part_to_dev(bdev->bd_part)->kobj);
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if (!bo->sdev)
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goto fail_put_hdev;
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@ -919,7 +911,6 @@ static int __blkdev_put(struct block_device *bdev, int for_part);
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static int do_open(struct block_device *bdev, struct file *file, int for_part)
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{
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struct module *owner = NULL;
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struct gendisk *disk;
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struct hd_struct *part = NULL;
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int ret;
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@ -941,25 +932,27 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
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ret = -ENXIO;
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file->f_mapping = bdev->bd_inode->i_mapping;
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lock_kernel();
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disk = get_gendisk(bdev->bd_dev, &partno);
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if (!disk) {
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unlock_kernel();
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bdput(bdev);
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return ret;
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}
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owner = disk->fops->owner;
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if (!disk)
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goto out_unlock_kernel;
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part = disk_get_part(disk, partno);
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if (!part)
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goto out_unlock_kernel;
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mutex_lock_nested(&bdev->bd_mutex, for_part);
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if (!bdev->bd_openers) {
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bdev->bd_disk = disk;
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bdev->bd_part = part;
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bdev->bd_contains = bdev;
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if (!partno) {
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struct backing_dev_info *bdi;
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if (disk->fops->open) {
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ret = disk->fops->open(bdev->bd_inode, file);
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if (ret)
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goto out_first;
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goto out_clear;
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}
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if (!bdev->bd_openers) {
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bd_set_size(bdev,(loff_t)get_capacity(disk)<<9);
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@ -975,31 +968,32 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
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whole = bdget_disk(disk, 0);
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ret = -ENOMEM;
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if (!whole)
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goto out_first;
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goto out_clear;
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BUG_ON(for_part);
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ret = __blkdev_get(whole, file->f_mode, file->f_flags, 1);
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if (ret)
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goto out_first;
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goto out_clear;
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bdev->bd_contains = whole;
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part = disk_get_part(disk, partno);
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bdev->bd_inode->i_data.backing_dev_info =
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whole->bd_inode->i_data.backing_dev_info;
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if (!(disk->flags & GENHD_FL_UP) ||
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!part || !part->nr_sects) {
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ret = -ENXIO;
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goto out_first;
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goto out_clear;
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}
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bdev->bd_part = part;
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bd_set_size(bdev, (loff_t)part->nr_sects << 9);
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}
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} else {
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disk_put_part(part);
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put_disk(disk);
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module_put(owner);
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module_put(disk->fops->owner);
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part = NULL;
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disk = NULL;
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if (bdev->bd_contains == bdev) {
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if (bdev->bd_disk->fops->open) {
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ret = bdev->bd_disk->fops->open(bdev->bd_inode, file);
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if (ret)
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goto out;
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goto out_unlock_bdev;
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}
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if (bdev->bd_invalidated)
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rescan_partitions(bdev->bd_disk, bdev);
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@ -1012,20 +1006,24 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
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unlock_kernel();
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return 0;
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out_first:
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out_clear:
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bdev->bd_disk = NULL;
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bdev->bd_part = NULL;
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bdev->bd_inode->i_data.backing_dev_info = &default_backing_dev_info;
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if (bdev != bdev->bd_contains)
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__blkdev_put(bdev->bd_contains, 1);
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bdev->bd_contains = NULL;
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put_disk(disk);
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disk_put_part(part);
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module_put(owner);
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out:
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out_unlock_bdev:
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mutex_unlock(&bdev->bd_mutex);
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out_unlock_kernel:
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unlock_kernel();
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if (ret)
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bdput(bdev);
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disk_put_part(part);
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if (disk)
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module_put(disk->fops->owner);
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put_disk(disk);
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bdput(bdev);
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return ret;
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}
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@ -1110,11 +1108,8 @@ static int __blkdev_put(struct block_device *bdev, int for_part)
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put_disk(disk);
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module_put(owner);
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if (bdev->bd_contains != bdev) {
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disk_put_part(bdev->bd_part);
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bdev->bd_part = NULL;
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}
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disk_put_part(bdev->bd_part);
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bdev->bd_part = NULL;
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bdev->bd_disk = NULL;
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bdev->bd_inode->i_data.backing_dev_info = &default_backing_dev_info;
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if (bdev != bdev->bd_contains)
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@ -134,12 +134,7 @@ char *disk_name(struct gendisk *hd, int partno, char *buf)
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const char *bdevname(struct block_device *bdev, char *buf)
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{
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int partno = 0;
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if (bdev->bd_part)
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partno = bdev->bd_part->partno;
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return disk_name(bdev->bd_disk, partno, buf);
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return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
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}
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EXPORT_SYMBOL(bdevname);
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@ -412,7 +412,7 @@ extern void rand_initialize_disk(struct gendisk *disk);
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static inline sector_t get_start_sect(struct block_device *bdev)
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{
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return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
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return bdev->bd_part->start_sect;
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}
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static inline sector_t get_capacity(struct gendisk *disk)
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{
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