Abstract: Examples described herein relate to method and system for managing write modes of a filesystem, wherein the filesystem is mapped to a thinly-provisioned virtual volume (TPVV) defined using a common-provisioning group (CPG) of a set of physical storage devices. The filesystem may be operated in a read-write mode. A used storage capacity of the CPG may be monitored when the filesystem is operational in the read-write mode. Further, a check may be performed to determine whether the used storage capacity of the CPG has reached a storage fullness threshold value. Accordingly, if it is determined that the used storage capacity of the CPG has reached the storage fullness threshold value, the filesystem may be transitioned to a partial read-only mode from the read-write mode.

Abstract: Some examples relate to performing application-defined object logging through a file system journal. In an example, a file system may determine during execution of an operation for an application whether a callback function is specified for the operation. In response to the determination, file system may invoke the callback function. File system may receive an object defined by the application. File system may link a copy of the object with a file system transaction associated with the operation in a journal of file system. File system may determine whether file system transaction is committed. In response to the determination, file system may write a copy of the object from the journal to an event log file. File system may allow the application to determine whether file system transaction is committed by enabling access to the event log file.

Abstract: In example implementations, a computing node is provided. The computing node includes a containerized application, a local storage partition, and a controller. A portion of the local storage partition is associated with portions of other local storage partitions to form a global cache. The controller executes the containerized application, receive an indication from a second computing node that the containerized application is being migrated, transfers data associated with the containerized application to the second computing node via the global cache.

Abstract: Some examples relate to updating of metadata of objects in a file system. In an example, in response to an invocation by an application to update metadata related to a plurality of objects of a file system, an API may initialize a new metadata deduplication database based on an active metadata deduplication database that includes the metadata related to the plurality of objects and a deduplication key linked with the metadata. API may add new metadata to the new metadata deduplication database. API may associate a new deduplication key with the new metadata in the new metadata deduplication database. API may initialize a new translation database. API may add the new deduplication key to the new translation database. API may associate the respective object IDs of the plurality of objects with the new deduplication key in the new translation database.

Abstract: Some examples relate to performing application-defined object logging through a file system journal. In an example, a file system may determine during execution of an operation for an application whether a callback function is specified for the operation. In response to the determination, file system may invoke the callback function. File system may receive an object defined by the application. File system may link a copy of the object with a file system transaction associated with the operation in a journal of file system. File system may determine whether file system transaction is committed. In response to the determination, file system may write a copy of the object from the journal to an event log file. File system may allow the application to determine whether file system transaction is committed by enabling access to the event log file.

Abstract: Partial snapshot creation includes identifying a file having requested data for providing to a user device in response to a user request. The file is stored in a plurality of physical data blocks of a storage device. A logical offset range corresponding to the requested data is ascertained. The logical offset range corresponds to a virtual location of the requested data in a file system. Range of physical data blocks in which the requested data is stored is determined based on a mapping table and a file parameter. The mapping table includes a mapping between the logical offset range and the requested data. A data block mapping between a snapshot inode, having metadata associated with partial snapshot, and the range of physical data blocks is created for obtaining a partial snapshot of the requested data. The partial snapshot is rendered to the user device in response to the user request.