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UBI: add UBI devices reference counting

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This is one more step on the way to "removable" UBI devices. It
adds reference counting for UBI devices. Every time a volume on
this device is opened - the device's refcount is increased. It
is also increased if someone is reading any sysfs file of this
UBI device or of one of its volumes.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy
2007-12-17 17:37:26 +02:00
parent 9f961b5756
commit e73f4459d9
7 changed files with 201 additions and 63 deletions
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drivers/mtd/ubi/vmt.c
+9 -5
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@@ -71,11 +71,16 @@ static ssize_t vol_attribute_show(struct device *dev,
{
int ret;
struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
struct ubi_device *ubi = vol->ubi;
struct ubi_device *ubi;
ubi = ubi_get_device(vol->ubi->ubi_num);
if (!ubi)
return -ENODEV;
spin_lock(&ubi->volumes_lock);
if (!ubi->volumes[vol->vol_id]) {
spin_unlock(&ubi->volumes_lock);
ubi_put_device(ubi);
return -ENODEV;
}
/* Take a reference to prevent volume removal */
@@ -108,10 +113,12 @@ static ssize_t vol_attribute_show(struct device *dev,
/* This must be a bug */
ret = -EINVAL;
/* We've done the operation, drop volume and UBI device references */
spin_lock(&ubi->volumes_lock);
vol->ref_count -= 1;
ubi_assert(vol->ref_count >= 0);
spin_unlock(&ubi->volumes_lock);
ubi_put_device(ubi);
return ret;
}
@@ -260,6 +267,7 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
}
ubi->avail_pebs -= vol->reserved_pebs;
ubi->rsvd_pebs += vol->reserved_pebs;
spin_unlock(&ubi->volumes_lock);
vol->vol_id = vol_id;
vol->alignment = req->alignment;
@@ -267,9 +275,7 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
vol->vol_type = req->vol_type;
vol->name_len = req->name_len;
memcpy(vol->name, req->name, vol->name_len + 1);
vol->exclusive = 1;
vol->ubi = ubi;
spin_unlock(&ubi->volumes_lock);
/*
* Finish all pending erases because there may be some LEBs belonging
@@ -350,8 +356,6 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
goto out_sysfs;
spin_lock(&ubi->volumes_lock);
ubi->vol_count += 1;
vol->exclusive = 0;
ubi->volumes[vol_id] = vol;
spin_unlock(&ubi->volumes_lock);