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Multiple inode sizes in same filesystem

IP.com Disclosure Number: IPCOM000249942D
Publication Date: 2017-May-05
Document File: 2 page(s) / 56K

Publishing Venue

The IP.com Prior Art Database

Related People

Freddy James: INVENTOR [+2]

Abstract

This disclosure proposes the concept of multiple inode sizes in the same filesystem.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 55% of the total text.

Freddy James

Brad Boyer

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Multiple inode sizes in same filesystem

Abstract

This disclosure proposes the concept of

multiple inode sizes in the same filesystem.

Problem Statement

There is significant advantage in packing small

files, directories or attributes within the inode. If

there is the right amount of space in inode, the

need to allocate new blocks for small files or

directories can be avoided and the need to

create new inodes to hold attributes can also

be avoided. However, the issue is what inode

size is ideal.

Publication Description

In the proposed method, we create multiple

inode lists of different inode sizes. An inode is

allocated from a selected list based on the

learned inode size. If we are unsure, there is a

default inode size. This way, the direct index

ability of inode records are kept and at the

same time all benefits of variable inode sizes

are achieved.

This is a set of list of inode and a set of inodes

in each list. The external inode number is

generated using the id of inode list and the

inode number with in the list. This way, the

internal inode number can be found from the

external inode number.

The attribute sizes can be determined based

on the past pattern. Currently, additional

inodes for hosting attributes ends up being

created, which results in metadata overhead

and fsck issues. Similarly, an odd size first

write is an indication of creation of a small file.

For directories, the average directory size is

determined.

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