linux-kernel - [PATCH] FS: add_partition silently ignored errors

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Message-ID: <20071106200259.GA3879@linux.intel.com>
Date:	Tue, 6 Nov 2007 12:02:59 -0800
From:	Dirk Hohndel <hohndel@...ux.intel.com>
To:	Bob Copeland <me@...copeland.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Andries Brouwer <aeb@....nl>, Al Viro <viro@....linux.org.uk>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH] FS: add_partition silently ignored errors

(since there was no more discussion, here's the last version that includes
the requested change to not fail if the partition is larger than the disk)

 add_partition silently ignored errors
 this patch passes meaningful errorcodes back
 and processes them in the calling functions

Signed-off-by: Dirk Hohndel <hohndel@...ux.intel.com>
---
 block/ioctl.c         |    9 +++++++--
 fs/partitions/check.c |   35 ++++++++++++++++++++++++++++-------
 include/linux/genhd.h |    2 +-
 3 files changed, 36 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..f802b32 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;
@@ -555,7 +574,9 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
 			printk(" %s: p%d exceeds device capacity\n",
 				disk->disk_name, p);
 		}
-		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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