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SubjectRe: [PATCH] add_partition silently ignored errors
On Tue, Oct 30, 2007 at 06:31:12PM +0100, Cornelia Huck wrote:
> On Tue, 30 Oct 2007 09:56:08 -0700,
> Dirk Hohndel <hohndel@linux.intel.com> wrote:
>
> > > > IIRC, Al recently vetoed a similar patch. As far as I'm concerned, with
> > > > the correct return values, the patch then looks fine to me.

So Al, are you ok with this one?

> > > We need some kind of check concerning the kobject to avoid mysterious
> > > errors (especially checking for the failed kobject_add() is needed).
> > > Whether we want just to inform the user of the failure instead of
> > > failing the function is another question.
> >
> > What are you suggesting? I'd love to make the behaviour consistent everywhere
> > (and am willing to go through things in order to make that happen), but what is
> > the consistent behaviour that we'd want?
>
> I'd be fine with just propagating the error after cleanup (that is what
> for example the driver core usually does), but I don't know the
> surrounding code well enough for a definitive answer.

Ok, I think I have it consistent now. I also ran it through checkpatch.pl :-)

/D


[FILESYSTEM] add_partition ignores errors

Signed-off-by: Dirk Hohndel <hohndel@linux.intel.com>

---
block/ioctl.c | 9 +++++++--
fs/partitions/check.c | 36 +++++++++++++++++++++++++++++-------
include/linux/genhd.h | 2 +-
3 files changed, 37 insertions(+), 10 deletions(-)
diff --git a/block/ioctl.c b/block/ioctl.c
index 52d6385..662ec18 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -16,7 +16,7 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
struct blkpg_partition p;
long long start, length;
int part;
- int i;
+ int i, err;

if (!capable(CAP_SYS_ADMIN))
return -EACCES;
@@ -61,7 +61,12 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
}
}
/* all seems OK */
- add_partition(disk, part, start, length, ADDPART_FLAG_NONE);
+ err = add_partition(disk, part, start, length,
+ ADDPART_FLAG_NONE)
+ if (err) {
+ mutex_unlock(&bdev->bd_mutex);
+ return err;
+ }
mutex_unlock(&bdev->bd_mutex);
return 0;
case BLKPG_DEL_PARTITION:
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 722e12e..dea79bd 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -368,13 +368,14 @@ void delete_partition(struct gendisk *disk, int part)
kobject_put(&p->kobj);
}

-void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len, int flags)
+int add_partition(struct gendisk *disk, int part, sector_t start, sector_t len, int flags)
{
struct hd_struct *p;
+ int err = 0;

p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
- return;
+ return -ENOMEM;

p->start_sect = start;
p->nr_sects = len;
@@ -390,20 +391,38 @@ void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len,
p->kobj.parent = &disk->kobj;
p->kobj.ktype = &ktype_part;
kobject_init(&p->kobj);
- kobject_add(&p->kobj);
+ err = kobject_add(&p->kobj);
+ if (err)
+ goto out_put;
if (!disk->part_uevent_suppress)
kobject_uevent(&p->kobj, KOBJ_ADD);
- sysfs_create_link(&p->kobj, &block_subsys.kobj, "subsystem");
+ err = sysfs_create_link(&p->kobj, &block_subsys.kobj, "subsystem");
+ if (err)
+ goto out_cleanup;
if (flags & ADDPART_FLAG_WHOLEDISK) {
static struct attribute addpartattr = {
.name = "whole_disk",
.mode = S_IRUSR | S_IRGRP | S_IROTH,
};

- sysfs_create_file(&p->kobj, &addpartattr);
+ err = sysfs_create_file(&p->kobj, &addpartattr);
+ if (err) {
+ sysfs_remove_link(&p->kobj, "subsystem");
+ goto out_cleanup;
+ }
}
partition_sysfs_add_subdir(p);
disk->part[part-1] = p;
+
+ return 0;
+
+out_cleanup:
+ if (!disk->part_uevent_suppress)
+ kobject_uevent(&p->kobj, KOBJ_REMOVE);
+ kobject_del(&p->kobj);
+out_put:
+ kobject_put(&p->kobj);
+ return err;
}

static char *make_block_name(struct gendisk *disk)
@@ -530,7 +549,7 @@ exit:
int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
{
struct parsed_partitions *state;
- int p, res;
+ int p, res, err;

if (bdev->bd_part_count)
return -EBUSY;
@@ -554,8 +573,11 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
if (from + size > get_capacity(disk)) {
printk(" %s: p%d exceeds device capacity\n",
disk->disk_name, p);
+ return -EBUSY;
}
- add_partition(disk, p, from, size, state->parts[p].flags);
+ err = add_partition(disk, p, from, size, state->parts[p].flags);
+ if (err)
+ return err;
#ifdef CONFIG_BLK_DEV_MD
if (state->parts[p].flags & ADDPART_FLAG_RAID)
md_autodetect_dev(bdev->bd_dev+p);
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index a47b802..ae6af2c 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -414,7 +414,7 @@ struct unixware_disklabel {
char *disk_name (struct gendisk *hd, int part, char *buf);

extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
-extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
+extern int add_partition(struct gendisk *, int, sector_t, sector_t, int);
extern void delete_partition(struct gendisk *, int);
extern void printk_all_partitions(void);

--
gitgui.0.8.4.g8d863
-
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