Segment Information Table (SIT) The SIT contains the valid block count and validity bitmap of all the Main Area blocks. Checkpoint (CP) The CP contains file system information, bitmaps for valid NAT/SIT sets, orphan inode lists, and summary entries of current active segments. It contains basic partition information and some default F2FS parameters. There are two copies to avoid file-system corruption. Superblock (SB) The SB is located at the beginning of the partition. By default, section and zone sizes are set to the same size, but users can easily modify the size with mkfs.į2FS splits the entire volume into six areas, and all except the superblock area consist of multiple segments as described below. A section is composed of consecutive segments, and a zone consists of a set of sections. ( May 2016) ( Learn how and when to remove this template message)į2FS divides the whole volume into a number of segments, each of which is fixed at 2 MB. Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This section needs additional citations for verification. In addition, since a NAND-based storage device shows different characteristics according to its internal geometry or flash memory management scheme (such as the Flash Translation Layer or FTL), it supports various parameters not only for configuring on-disk layout, but also for selecting allocation and cleaning algorithms. Jaegeuk Kim, the principal F2FS author, has stated that it remedies some known issues of the older log-structured file systems, such as the snowball effect of wandering trees and high cleaning overhead. The motive for F2FS was to build a file system that, from the start, takes into account the characteristics of NAND flash memory-based storage devices (such as solid-state disks, eMMC, and SD cards), which are widely used in computer systems ranging from mobile devices to servers.į2FS was designed on a basis of a log-structured file system approach, which is adapted to newer forms of storage. Modification (mtime), attribute modification (ctime), access (atime)į2FS ( Flash-Friendly File System) is a flash file system initially developed by Samsung Electronics for the Linux kernel. Samsung Electronics, Motorola Mobility, Huawei and Google ( May 2017) ( Learn how and when to remove this template message)
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