System and method for committing data objects to be immutable
Techniques for committing data objects to be immutable are described herein. According to one embodiment, in response to a request received through an interface of a storage system, the request being associated with a data object stored in the storage system, it is determined whether the data object should be committed to be immutable. The data object is committed to be immutable if it is determined that the data object should be committed to be immutable. Thereafter, an action associated with the request is performed, where the action is performed dependent upon whether the data object is immutable. Other methods and apparatuses are also described.
1. A computer-implemented method for managing data objects, comprising:
receiving at a file system interface of a storage system a request from a client application for accessing a data object stored in a storage device of the storage system, wherein the request is an ordinary file system call associated with the file system;
in response to the request, decoding the request by a command decoder executed by a processor of the storage system to determine whether the request belongs to a predetermined category, including determining whether the request is to modify or delete content of the data object as part of the ordinary file system call;
in response to determining that the request belongs to the predetermined category, automatically determining by a state manager of the storage system whether the data object should be committed as a read-only object based on a predetermined policy, wherein the data object is not the read-only object prior to receiving the request, and wherein determining whether the data object should be committed as the read-only object is only performed when the request is to modify or delete content of the data object;
committing by the state manager the data object as the read-only object if it is determined that the data object should be committed as the read-only object;
modifying or deleting by an enforcement agent the data object according to the request as part of the ordinary file system call, if it is determined that the data object should not be committed as the read-only object; and
rejecting the request by returning an error to the client application as part of the ordinary file system call, if it is determined that the data object should be committed as the read-only object.
2. The method of claim 1 , further comprising examining the request to determine whether a result of an action associated with the request would likely be different if the data object was a read-only object, wherein determining whether the data object should be committed as the read-only object is performed if it is likely that the result of the action would be different if the data object was a read-only object.
3. The method of claim 1 , wherein determining whether the data object should be committed as the read-only object is performed only when the request requires different handling dependent upon whether the data object is a read-only object.
4. The method of claim 1 , wherein committing the data object as the read-only object comprises associating a retention period with the data object during which the data object is protected from modification.
5. The method of claim 4 , wherein associating the retention period with the data object comprises setting a time attribute of the data object to a time beyond a current time.
6. The method of claim 5 , wherein the time attribute for retention period is a last access time (atime) attribute of the data object.
7. The method of claim 1 , wherein determining whether the data object should be committed as a read-only object comprises determining whether the data object has been modified within a last predetermined period of time, and wherein the data object is committed as a read-only object if the data object has not been modified within a last predetermined period of time.
8. The method of claim 7 , wherein determining whether the data object has been modified within a last predetermined period of time comprises comparing a time attribute of the data object against a current time, wherein if a difference between the time attribute and the current time is greater than a predetermined threshold, the data object is committed as a read-only object.
9. A non-transitory computer-readable medium having instructions stored therein, which when executed by a processor, cause the processor to perform operations for managing data objects, the operations comprising:
receiving at a file system interface of a storage system a request from a client application for accessing a data object stored in a storage device of the storage system, wherein the request is an ordinary file system call associated with the file system;
in response to the request, decoding the request by a command decoder executed by a processor of the storage system to determine whether the request belongs to a predetermined category, including determining whether the request is to modify or delete content of the data object as part of the ordinary file system call;
in response to determining that the request belongs to the predetermined category, automatically determining by a state manager of the storage system whether the data object should be committed as a read-only object based on a predetermined policy, wherein the data object is not the read-only object prior to receiving the request, and wherein determining whether the data object should be committed as the read-only object is only performed when the request is to modify or delete content of the data object;
committing by the state manager the data object as the read-only object if it is determined that the data object should be committed as the read-only object;
modifying or deleting by an enforcement agent the data object according to the request as part of the ordinary file system call, if it is determined that the data object should not be committed as the read-only object; and
rejecting the request by returning an error to the client application as part of the ordinary file system call, if it is determined that the data object should be committed as the read-only object.
10. The non-transitory computer-readable medium of claim 9 , wherein the operations further comprise examining the request to determine whether a result of an action associated with the request would likely be different if the data object was a read-only object, wherein determining whether the data object should be committed as the read-only object is performed if it is likely that the result of the action would be different if the data object was a read-only object.
11. The non-transitory computer-readable medium of claim 9 , wherein determining whether the data object should be committed as the read-only object is performed only when the request requires different handling dependent upon whether the data object is a read-only object.
12. The non-transitory computer-readable medium of claim 9 , wherein committing the data object as the read-only object comprises associating a retention period with the data object during which the data object is protected from modification.
13. The non-transitory computer-readable medium of claim 12 , wherein associating the retention period with the data object comprises setting a time attribute of the data object to a time beyond a current time.
14. The non-transitory computer-readable medium of claim 13 , wherein the time attribute for retention period is a last access time (atime) attribute of the data object.
15. The non-transitory computer-readable medium of claim 9 , wherein determining whether the data object should be committed as a read-only object comprises determining whether the data object has been modified within a last predetermined period of time, and wherein the data object is committed as a read-only object if the data object has not been modified within a last predetermined period of time.
16. The non-transitory computer-readable medium of claim 15 , wherein determining whether the data object has been modified within a last predetermined period of time comprises comparing a time attribute of the data object against a current time, wherein if a difference between the time attribute and the current time is greater than a predetermined threshold, the data object is committed as a read-only object.
17. A storage system, comprising:
a processor;
a storage device; and
memory coupled to the processor to store instructions, which when executed from the memory, cause the processor to perform operations, the operations including
receiving, at a file system interface of a file system, a request from a client application for accessing a data object stored in the storage device, wherein the request is an ordinary file system call associated with the file system,
in response to the request, decoding the request by a command decoder executed by the processor to determine whether the request belongs to a predetermined category, including determining whether the request is to modify or delete content of the data object as part of the ordinary file system call,
in response to determining that the request belongs to the predetermined category, automatically determining by a state manager whether the data object should be committed as a read-only object based on a predetermined policy, wherein the data object is not the read-only object prior to receiving the request, and wherein determining whether the data object should be committed as the read-only object is only performed when the request is to modify or delete content of the data object,
committing by the state manager the data object as the read-only object if it is determined that the data object should be committed as the read-only object,
modifying or deleting by an enforcement agent the data object according to the request as part of the ordinary file system call, if it is determined that the data object should not be committed as the read-only object, and
rejecting the request by returning an error to the client application as part of the ordinary file system call, if it is determined that the data object should be committed as the read-only object.
18. The system of claim 17 , wherein the request is examined to determine whether a result of an action associated with the request would likely be different if the data object was a read-only object, wherein determining whether the data object should be committed as the read-only object is performed if it is likely that the result of the action would be different if the data object was a read-only object.
19. The system of claim 17 , wherein determining whether the data object should be committed as the read-only object is performed only when the request requires different handling dependent upon whether the data object is a read-only object.
20. The system of claim 17 , wherein committing the data object as the read-only object comprises associating a retention period with the data object during which the data object is protected from modification.
21. The system of claim 20 , wherein associating the retention period with the data object comprises setting a time attribute of the data object to a time beyond a current time.
22. The system of claim 21 , wherein the time attribute for retention period is a last access time (atime) attribute of the data object.
23. The system of claim 17 , wherein determining whether the data object should be committed as a read-only object comprises determining whether the data object has been modified within a last predetermined period of time, and wherein the data object is committed as a read-only object if the data object has not been modified within a last predetermined period of time.
24. The system of claim 23 , wherein determining whether the data object has been modified within a last predetermined period of time comprises comparing a time attribute of the data object against a current time, wherein if a difference between the time attribute and the current time is greater than a predetermined threshold, the data object is committed as a read-only object.