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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: Tejun Heo <tj@kernel.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Tejun Heo 2008-11-10 15:29:58 +09:00 committed by Jens Axboe
parent eb60fa1066
commit ba32929a91
3 changed files with 19 additions and 17 deletions
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7
block/ioctl.c
View File

@ -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,
ADDPART_FLAG_NONE);
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)

25
fs/partitions/check.c
View File

@ -348,8 +348,8 @@ 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,
sector_t start, sector_t len, int flags)
struct hd_struct *add_partition(struct gendisk *disk, int partno,
sector_t start, sector_t len, int flags)
{
struct hd_struct *p;
dev_t devt = MKDEV(0, 0);
@ -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

4
include/linux/genhd.h
View File

@ -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);