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A Support of GVFS Caching
Holý, Ondřej ; Zelený, Jan (referee) ; Smrčka, Aleš (advisor)
The master's thesis deals with a support of caching in GVfs (Gnome Virtual filesystem). Basics of caches, cache invalidation, and cache replacement algorithms are described. Description of GIO filesystem abstraction and communication of modules within GVfs is provided next. The disadvantages of individual GVfs modules and, if present, their internal caches are discussed. The thesis proposes three types of cache. The first type of cache is for storing file metadata, the second one for directory listings, and the latter for file content. These caches have been implemented in a prototype and verified with respect to the functionality and performance. The main benefits of the proposed solution are faster work with virtual filesystems and provided missing functionality of lower-level virtual filesystem to GIO abstraction (namely, for instance seek operation).
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Online Deduplication for Btrfs
Křížek, Martin ; Michal, Bohumil (referee) ; Kašpárek, Tomáš (advisor)
Btrfs je copy-on-write linuxový souborový systém, který obsahuje vlastního správce oddílů a podporuje efektivní operace se snapshoty. Online deduplikace dat je metoda odstranění duplicitních bloků dat ještě předtím než jsou zapsány na disk. Tato funkcionalita šetří místo na uložišti avšak může v jistých případech znamenat pokles výkonu při zápisu. Hlavním využitím jsou soubory obrazů disků virtuálních strojů. Takové soubory obsahují z velké části stejná data (stejný operační systém) a tedy tyto části lze zapsat na disk pouze jednou. Tato diplomová práce se zabývá návrhem a implementací online deduplikace pro souborový systém Btrfs.
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Low-level data reading from computer data storages
Šalko, Jaroslav ; Ležák, Petr (referee) ; Burda, Karel (advisor)
The following work is topically focusing on data restore of selected memory devices. It could be divided into two theoretical parts and one practical. The first part consist explanation of these memory media’s structure, the mechanism of their storage and also how operating system approaches these data. This relates also to a file system, which is among with its most commonly used types described there as well. In the second theoretical part the study focuses on the storage damage problematics. Various types of damage are shown and I examine how we could approach them. The work concentrates on possibilities which owners of the damaged storage media have with an emphasis on specialized companies. Therefore the study contains brief information of four selected domestic companies which are offering data restore on the Czech market. The complete list of services, which these companies offer to their customers, is shown in the chart found by the end of chapter. The second option in order of solving media damage problems are freeware programmes. On the basis of an internet poll dealing with the topic „best programmes for data restore“, I have chosen three programmes to be examined. The examination consisted of uploading certain files on the media storage which was formated by high level method afterwards. Through these three programmes I tried to restore the lost data. The results are included in a chart found by the end of each sub-chapter. The practical part of my work deals with linux program for data restore DDrescue. My effort consists of developing and creating an user friendly interface with intuitive manipulation of this helpful tool. My goal is thus spreading this program into the public and providing them simple tool for efficient low-level data restore.
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Information Systems Based on a Virtual Filesystem
Jonáš, Martin ; Očenášek, Pavel (referee) ; Burget, Radek (advisor)
This term project describes the concept of information system based on the virtual file system and the reasons which led to the creation of this concept. It discusses the basic approaches to solve common parts of the functionality of information system (such as access rights management, structure of data and managing configuration of system) and tries to find the concept that solves this functionality consistently and easily. The main objective of the proposed concept is to create a system that brings simplicity and intuitiveness of user interface, unification of common functionality and maximum flexibility and extensibility. The whole concept is based on the representation of the system as a tree of virtual files on which user performs actions.
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RedirFS - Application on Data Compression
Podroužek, Jan ; Čejka, Rudolf (referee) ; Kašpárek, Tomáš (advisor)
This thesis in its first part examines the problems of developing linux kernel modules, specifically modules implementig RedirFS filters. In the next part it considers different types of copression algorithms and the implementation specifics on the CryptoAPI framework in the linux kernel. Finally it describes the design and operation of the CompFLT module that implements a RedirFS compression filter. Benchmarks done using the CompFLT module are presented in the last section.
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The Design of a USB Device
Klír, Tomáš ; Strašil, Ivo (referee) ; Hudec, Antonín (advisor)
In theoretical part of this master thesis is analyzed USB 2.0 interface, including USB OTG. Mainly are described here properties which are good to know for USB device design. In brief is given here a structure of the FAT file system. Practical part contains design of OTG Device and it’s realization including implementation of libraries for communication via USB and for working with FAT file system.
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Various File Systems Used on Different Storage Devices
Bortlová, Pavlína ; Krčma, Martin (referee) ; Lojda, Jakub (advisor)
The bachelor thesis deals with storing data on various storage devices, namely on the HDD, SSD, flash drives, SD cards. In the teoretical part are discussed principles of functions storage media and data storage structure through various file system. In the practical part was measured read and write speeds selected combinations of file systems (FAT, NTFS, XFS, ext4, btrfs, exFAT, JFFS, F2FS) and storage devices (HDD, SSD, flash drive, sd card).
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