Abstract: A method, system and computer-readable recording medium for storing metadata of a log-structured file system. The method includes receiving a block management request signal including information about a block number and indicating whether it is an allocation request or a deallocation request for a block, calculating a segment number to which the block belongs with reference to the block number, obtaining a metadata segment usage (MSU) item corresponding to the segment number, wherein the metadata segment usage (MSU) item includes information about a segment number and a number of valid blocks, and increasing the number of valid blocks of the metadata segment usage (MSU) item by one when the block management request signal corresponds to the allocation request, and decreasing the number of valid blocks of the metadata segment usage (MSU) by one item when the block management request signal corresponds to the deallocation request.

Abstract: A method, system and computer-readable recording medium for storing metadata of a log-structured file system. The method includes receiving a block management request signal including information about a block number and indicating whether it is an allocation request or a deallocation request for a block, calculating a segment number to which the block belongs with reference to the block number, obtaining a metadata segment usage (MSU) item corresponding to the segment number, wherein the metadata segment usage (MSU) item includes information about a segment number and a number of valid blocks, and increasing the number of valid blocks of the metadata segment usage (MSU) item by one when the block management request signal corresponds to the allocation request, and decreasing the number of valid blocks of the metadata segment usage (MSU) by one item when the block management request signal corresponds to the deallocation request.

Abstract: Disclosed is a method for storing data of a log-structured file system (LFS), which does not separately store segment summary information (SS) and segment usage information (SU) but makes a checkpoint be included in a checkpoint record and written upon writing the checkpoint to improve write performance for a flash memory by decreasing the number of metadata to be written in a flash page.

Abstract: A file management system for managing a file using a logical erase block (LEB) corresponding to a physical erase block (PEB). The file management system includes a free LEB list storing a free LEB allowing writing on all pages; a dirty LEB list storing a dirty LEB that is not the free LEB; and an obsolete area determining module determining an obsolete area in at least one dirty LEB, by referring to a block table storing information about whether or not at least one block is being used and according to whether or not the at least one dirty LEB is mapped to a PEB.

Abstract: Disclosed is a method for storing data of a log-structured file system (LFS), which does not separately store segment summary information (SS) and segment usage information (SU) but makes a checkpoint be included in a checkpoint record and written upon writing the checkpoint to improve write performance for a flash memory by decreasing the number of metadata to be written in a flash page.

Abstract: A file management apparatus and a method for managing a file system are disclosed. According to an aspect, there is provided an apparatus for managing a file using a logical erase block (LEB) corresponding to a physical erase block (PEB), including: a free LEB list storing a free LEB allowing writing on all pages; a dirty LEB list storing a dirty LEB that is not the free LEB; and an obsolete area determining module determining an obsolete area in at least one dirty LEB, by referring to a block table storing information about whether or not at least one block is being used and according to whether or not the at least one dirty LEB is mapped to a PEB.

Abstract: The present invention relates generally to a method and apparatus for initializing an embedded device. When a boot loader is executed and a kernel is loaded, an initialization program is executed, and a booting sequence including information about an operating sequence of a boot process is loaded. Thereafter, initialization functions which are included in a script replacement function module of the embedded device are executed, and then a state of the embedded device is set to a usable state. Accordingly, the method and apparatus can efficiently perform the operations of an initialization program that is used to solve the complexity of the initialization of an OS inevitably appearing on mobile devices and high-performance embedded devices, and an initialization script that is operated to flexibly execute the initialization program on various devices having different characteristics.

Abstract: A file system of a flash memory includes: a file system layer; a physical erase block (PEB) layer configured to recognize a PEB of the flash memory by the unit of PEB address; and a logical erase block (LEB) layer positioned under the file system layer and over the PEB layer and configured to provide an LEB address mapped to the PEB to the file system layer.