Method for protecting partial space of SSD space and storage system
This application relates to the field of storage technology and discloses a method for protecting partial space of SSD and a storage system. The storage space of the SSD is divided into multiple regions and there is a partition table stored in the SSD, which includes region type of each region. The method includes: receiving, by the SSD, a command to read the partition table; and retrieving, by the SSD, the partition table, removing one or more regions with the region type being locked from the partition table, and returning the removed partition table. This application provides a simple implementation and self-encrypting protection scheme, which requires fewer running resources, is easy to operate, has strong portability, and can meet basic self-encrypting and locking requirements.
1. A method for protecting partial space of SSD, wherein storage space of the SSD is divided into multiple regions and there is a partition table stored in the SSD, which includes region type of each region, the method comprises:
receiving, by the SSD, a command from a host to read the partition table; and
the SSD retrieving, the partition table, removing one or more regions, with the region type being locked, from the partition table, and returning the partially removed partition table; wherein the host instructed the SSD to sets the one or more regions type to locked.
2. The method for protecting partial space of the SSD according to claim 1 , wherein the partition table includes partition planning information for each region, and the partition planning information includes region type and start and end addresses, removing one or more regions with the region type being locked from the partition table includes: setting the partition planning information corresponding to the one or more regions with the region type being locked to a default value.
3. The method for protecting partial space of the SSD according to claim 1 , wherein if the region type of the one or more regions is unlocked or not-locked, the partition table is directly returned.
4. The method for protecting partial space of the SSD according to claim 3 , wherein the not-locked type represents the region is readable, writable, and erasable, and the unlocked type represents the region is readable, writable, and unerasable.
5. The method for protecting partial space of the SSD according to claim 1 , wherein the locked type represents the region is unreadable, unwritable, and unerasable.
6. An SSD storage system comprises: storage space of the SSD is divided into multiple regions and a partition table stored in the SSD, which includes region type of each region; when the SSD receives a command from a host to read the partition table, the SSD retrieves the partition table, removes one or more regions with the region type being locked from the partition table, and returns the partially removed partition table; wherein the host instructed the SSD to sets the one or more regions type to locked.
7. The SSD storage system according to claim 6 , wherein the partition table includes partition planning information for each region, which includes region type and start and end addresses, removing one or more regions with the region type being locked from the partition table includes: setting the partition planning information corresponding to the one or more regions with the region type being locked to a default value.
8. The SSD storage system according to claim 6 , wherein if the region type of the one or more regions is unlocked or not-locked, the partition table is directly returned.
9. The SSD storage system according to claim 6 , wherein the SSD storage system has at least four statuses:
status 0: the storage space of the SSD is not divided into multiple regions;
status 1: the storage space of the SSD is divided into multiple regions, with each region not-locked;
status 2: the storage space of the SSD is divided into multiple regions, with at least one region locked but has been unlocked; and
status 3: the storage space of the SSD is divided into multiple regions, with at least one region locked.
10. The SSD storage system according to claim 9 , wherein the not-locked type represents the region is readable, writable, and erasable, the unlocked type represents the region is readable, writable, and unerasable, and the locked type represents the region is unreadable, unwritable, and unerasable.