52 results about "Journaling file system" patented technology

A method and system that reduces the length of time required to complete antivirus scans. An enhanced journal file system (JFS) includes an antivirus utility function, which utilizes a low level log of the JFS to store a history of transactions that occur since a previous scan operation. The log is immune from normal purge operations by the JFS and cannot be circumvented without driver level access. Thus, a virus that changes the timestamp on the file or otherwise attempts to hide its viral activity does not affect the log. When the antivirus scanning utility initiates an antivirus scan of the system, the antivirus scanning utility obtains the history since the last scan from the persistent log. The antivirus scanning utility “replays” the log and carries out the antivirus scan on all files, directories, etc. associated with any transactions that occurred since the last scan.

A computer system includes a disk apparatus and a host computer including a journal file system. The disk apparatus includes a memory unit which is capable of permanently storing a journal, a storing control unit which stores a journal, which is sent from the host computer, in the memory unit, and an updating unit which executes data update corresponding to the journal stored in the memory unit in accordance with an instruction from the host computer. The journal file system of the host computer includes a writing unit which executes, each time the data on the disk apparatus is updated, writing of a journal, which corresponds to the data update, to the disk apparatus, and an informing unit which informs the disk apparatus of an instruction to execute the data update corresponding to the written journal.

A method and apparatus for ensuring valid journaling file system metadata during backup operations provides a mechanism for suspending write I / O operations to a storage device during point-in-time backup operations. After the real-time point backup operation is completed, the pending write I / O operation is released, and then processed by the storage system. Sets the point-in-time backup flag in the Logical Volume Manager when initiating a point-in-time operation. When receiving a write I / O operation, the logical volume manager checks the status of the real-time point backup flag to determine whether the real-time point backup operation is currently being performed. If the flag is not set, write I / O operations are logged and performed as normal. If the flag is set, write I / O operations are stored in the holding queue of the logical volume manager. When a write I / O is stored in the holding queue, it is not allowed to be sent to the storage system. When the real-time point backup operation is completed, the pending write I / O operations in the holding queue are allowed to be sent to the storage system, and the metadata for the file system is updated to reflect the submission of the write I / O operations.

A method is provided for detecting viruses. According to the method, data is stored in a journal area of memory before changes embodied in the data are written to virtual memory. At least a first portion of the data in the journal area of memory is scanned for viruses. In some embodiments, a second portion of data that immediately precedes and / or immediately follows data to which the first portion of the data pertains is scanned for viruses. Preferably, the virtual memory includes a persistent storage device. Also provided is a system that includes a processor, a memory that includes virtual memory and a journal storage area, and a virus scanner controlled by the processor. The virus scanner scans the journal storage area for viruses.

The invention provides a log file analysis system and the method, wherein, the log file system comprises: a comparison file storage module for prestoring a comparison file for comparing with the log file; a receiving module for receiving the log file of the operational state relating to the server and / or terminal on a train; a comparison module for comparing the log file and the comparison file; and an analysis module for analyzing the operational state of the server and / or terminal according to the comparative result. Through the invention, the program broadcast situation on each train can be reflected in time, real time, and truly, comprising no broadcast log, abnormal shutdown, not broadcasting when start, and failure in loading programme source, etc. no manual intervention is needed, all the steps can be automatically completed by the system; the invention has the characteristics of high efficiency, high speed and accuracy data, etc.

A journaling file allocation table (FAT) file system includes an FAT file system module, a storage device and a driver. The FAT file system module includes a journaling module and receives a file operation instruction sent by an operating system. The storage device has an FAT file system and an FAT journaling cache. The driver is coupled to the FAT file system module, the journaling module and the storage device in order to access the storage device. When the FAT file system stored in the storage device is a journaling FAT file system, the FAT file system module enables the journaling module to receive and execute the file operation instruction sent by the operating system and to accordingly produce a corresponding file operation instruction to the driver for performing a journaling file operation on the storage device.