Abstract
Nowadays mobile devices such as mobile phones, mp3 players and PDAs are becoming evermore common. Most of them use flash chips as storage. To store data efficiently on flash, it is necessary to adapt ordinary file systems because they are designed for use on hard disks. Most of the file systems use some kind of search tree to store index information, which is very important from a performance aspect. Here we improved the B+ search tree algorithm so as to make flash devices more efficient. Our implementation of this solution saves 98%-99% of the flash operations, and is now the part of the Linux kernel.
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References
Ubifs website, http://www.linux-mtd.infradead.org/doc/ubifs.html
JFFS: The journalling flash file system. In: Proceedings of the Ottawa Linux Symposium (2001)
Bez, R., Camerlenghi, E., Modelli, A., Visconti, A.: Introduction to flash memory. Proceedings of the IEEE 91(4), 489–502 (2003)
Comer, D.: Ubiquitous b-tree. ACM Comput. Surv. 11(2), 121–137 (1979)
Lee, H.-S., Sangwon Park, H.J.S., Lee, D.H.: An efficient buffer management scheme for implementing a b-tree on nand flash memory. Embedded Software and Systems, 181–192 (2007)
Intel: Understanding the flash translation layer (ftl) specification. Tech. rep., Intel Corporation (1998)
Jrn Engel, R.M.: Logfs - finally a scalable flash file system
M-Systems: Two technologies compared: Nor vs. nand - white paper. Tech. rep., M-Systems Corporation (2003)
On, S.T., Hu, H., Li, Y., Xu, J.: Lazy-update b+-tree for flash devices. In: Mobile Data Management. In: IEEE International Conference on Mobile Data Management, pp. 323–328 (2009)
Wu, C.-H., Kuo, T.-W., Chang, L.P.: An efficient b-tree layer implementation for flash-memory storage systems. ACM Trans. Embed. Comput. Syst. 6(3), 19 (2007)
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Havasi, F. (2011). An Improved B+ Tree for Flash File Systems. In: Černá, I., et al. SOFSEM 2011: Theory and Practice of Computer Science. SOFSEM 2011. Lecture Notes in Computer Science, vol 6543. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18381-2_25
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DOI: https://doi.org/10.1007/978-3-642-18381-2_25
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-18380-5
Online ISBN: 978-3-642-18381-2
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