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Commit ba32929a authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
Browse files

block: make add_partition() return pointer to hd_struct 



Make add_partition() return pointer to the new hd_struct on success
and ERR_PTR() value on failure.  This change will be used to fix md
autodetection bug.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent eb60fa10

block/ioctl.c

+3 −4
Original line number Diff line number Diff line
@@ -18,7 +18,6 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user 
	struct disk_part_iter piter;

	long long start, length;

	int partno;

	int err;



	if (!capable(CAP_SYS_ADMIN))

		return -EACCES;
@@ -61,10 +60,10 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user 
			disk_part_iter_exit(&piter);



			/* all seems OK */

			err = add_partition(disk, partno, start, length,

			part = add_partition(disk, partno, start, length,

					     ADDPART_FLAG_NONE);

			mutex_unlock(&bdev->bd_mutex);

			return err;

			return IS_ERR(part) ? PTR_ERR(part) : 0;

		case BLKPG_DEL_PARTITION:

			part = disk_get_part(disk, partno);

			if (!part)

fs/partitions/check.c

+13 −12
Original line number Diff line number Diff line
@@ -348,7 +348,7 @@ static ssize_t whole_disk_show(struct device *dev, 
static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,

		   whole_disk_show, NULL);



int add_partition(struct gendisk *disk, int partno,

struct hd_struct *add_partition(struct gendisk *disk, int partno,

				sector_t start, sector_t len, int flags)

{

	struct hd_struct *p;
@@ -361,15 +361,15 @@ int add_partition(struct gendisk *disk, int partno, 


	err = disk_expand_part_tbl(disk, partno);

	if (err)

		return err;

		return ERR_PTR(err);

	ptbl = disk->part_tbl;



	if (ptbl->part[partno])

		return -EBUSY;

		return ERR_PTR(-EBUSY);



	p = kzalloc(sizeof(*p), GFP_KERNEL);

	if (!p)

		return -ENOMEM;

		return ERR_PTR(-EBUSY);



	if (!init_part_stats(p)) {

		err = -ENOMEM;
@@ -424,20 +424,20 @@ int add_partition(struct gendisk *disk, int partno, 
	if (!ddev->uevent_suppress)

		kobject_uevent(&pdev->kobj, KOBJ_ADD);



	return 0;

	return p;



out_free_stats:

	free_part_stats(p);

out_free:

	kfree(p);

	return err;

	return ERR_PTR(err);

out_del:

	kobject_put(p->holder_dir);

	device_del(pdev);

out_put:

	put_device(pdev);

	blk_free_devt(devt);

	return err;

	return ERR_PTR(err);

}



/* Not exported, helper to add_disk(). */
@@ -568,10 +568,11 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev) 
			       disk->disk_name, p, (unsigned long long) size);

			size = get_capacity(disk) - from;

		}

		res = add_partition(disk, p, from, size, state->parts[p].flags);

		if (res) {

			printk(KERN_ERR " %s: p%d could not be added: %d\n",

				disk->disk_name, p, -res);

		part = add_partition(disk, p, from, size,

				     state->parts[p].flags);

		if (IS_ERR(part)) {

			printk(KERN_ERR " %s: p%d could not be added: %ld\n",

			       disk->disk_name, p, -PTR_ERR(part));

			continue;

		}

#ifdef CONFIG_BLK_DEV_MD

include/linux/genhd.h

+3 −1
Original line number Diff line number Diff line
@@ -522,7 +522,9 @@ extern char *disk_name (struct gendisk *hd, int partno, char *buf); 


extern int disk_expand_part_tbl(struct gendisk *disk, int target);

extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);

extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int);

extern struct hd_struct * __must_check add_partition(struct gendisk *disk,

						     int partno, sector_t start,

						     sector_t len, int flags);

extern void delete_partition(struct gendisk *, int);

extern void printk_all_partitions(void);