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authorTejun Heo <tj@kernel.org>2008-08-25 19:30:16 +0900
committerJens Axboe <jens.axboe@oracle.com>2008-10-09 08:56:04 +0200
commit88e341261ca4d39eec21b212961c77eff51105f7 (patch)
treeb65315c446ce592e6a0dc521eab9acd92ae61c5e
parentec2cdedf798385a9397ac50dd0405dd658f8529c (diff)
downloadlinaro-lsk-88e341261ca4d39eec21b212961c77eff51105f7.tar.gz
block: update add_partition() error handling
d805dda4 tried to fix error case handling in add_partition() but had a few problems. * disk->part[] entry is set early and left dangling if operation fails. * Once device initialized, the last put_device() is responsible for freeing all the resources. The failure path freed part_stats and p regardless of put_device() causing double free. * holders subdir holds reference to the disk device, so failure path should remove it to release resources properly which was missing. This patch fixes the above problems and while at it move partition slot busy check into add_partition() for completeness and inlines holders subdirectory creation. Using separate function for it just obfuscates the code. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Abdel Benamrouche <draconux@gmail.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
-rw-r--r--block/ioctl.c7
-rw-r--r--fs/partitions/check.c40
2 files changed, 23 insertions, 24 deletions
diff --git a/block/ioctl.c b/block/ioctl.c
index c722de0ef2e..eb046aeede8 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -43,12 +43,9 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
|| pstart < 0 || plength < 0)
return -EINVAL;
}
- /* partition number in use? */
+
mutex_lock(&bdev->bd_mutex);
- if (disk->part[part - 1]) {
- mutex_unlock(&bdev->bd_mutex);
- return -EBUSY;
- }
+
/* overlap? */
for (i = 0; i < disk->minors - 1; i++) {
struct hd_struct *s = disk->part[i];
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 68f3e41ae66..16f98d82460 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -300,15 +300,6 @@ struct device_type part_type = {
.release = part_release,
};
-static inline void partition_sysfs_add_subdir(struct hd_struct *p)
-{
- struct kobject *k;
-
- k = kobject_get(&p->dev.kobj);
- p->holder_dir = kobject_create_and_add("holders", k);
- kobject_put(k);
-}
-
static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
{
struct kobject *k;
@@ -347,13 +338,16 @@ int add_partition(struct gendisk *disk, int part, sector_t start, sector_t len,
struct hd_struct *p;
int err;
+ if (disk->part[part - 1])
+ return -EBUSY;
+
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return -ENOMEM;
if (!init_part_stats(p)) {
err = -ENOMEM;
- goto out0;
+ goto out_free;
}
p->start_sect = start;
p->nr_sects = len;
@@ -372,34 +366,42 @@ int add_partition(struct gendisk *disk, int part, sector_t start, sector_t len,
p->dev.class = &block_class;
p->dev.type = &part_type;
p->dev.parent = &disk->dev;
- disk->part[part-1] = p;
/* delay uevent until 'holders' subdir is created */
p->dev.uevent_suppress = 1;
err = device_add(&p->dev);
if (err)
- goto out1;
- partition_sysfs_add_subdir(p);
+ goto out_put;
+
+ err = -ENOMEM;
+ p->holder_dir = kobject_create_and_add("holders", &p->dev.kobj);
+ if (!p->holder_dir)
+ goto out_del;
+
p->dev.uevent_suppress = 0;
if (flags & ADDPART_FLAG_WHOLEDISK) {
err = device_create_file(&p->dev, &dev_attr_whole_disk);
if (err)
- goto out2;
+ goto out_del;
}
+ /* everything is up and running, commence */
+ disk->part[part - 1] = p;
+
/* suppress uevent if the disk supresses it */
if (!disk->dev.uevent_suppress)
kobject_uevent(&p->dev.kobj, KOBJ_ADD);
return 0;
-out2:
+out_free:
+ kfree(p);
+ return err;
+out_del:
+ kobject_put(p->holder_dir);
device_del(&p->dev);
-out1:
+out_put:
put_device(&p->dev);
- free_part_stats(p);
-out0:
- kfree(p);
return err;
}