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Date: Thu, 6 Jun 2019 18:41:42 +0800
From: Jianchao Wang <jianchao.wan9@...il.com>
To: linux-ext4@...r.kernel.org
Cc: tytso@....edu, adilger.kernel@...ger.ca
Subject: [HELP] What are the allocated blocks on a newly created ext4 fs ?
Dear all
After I newly created a ext4 fs and check the mb_group,
#group: free frags first [ 2^0 2^1 2^2 2^3 2^4 2^5 2^6 2^7 2^8 2^9 2^10 2^11 2^12 2^13 ]
#0 : 23513 1 9255 [ 1 0 0 1 1 0 1 1 1 1 0 1 1 2 ]
#1 : 31743 1 1025 [ 1 1 1 1 1 1 1 1 1 1 0 1 1 3 ]
^^^^
#2 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ]
#3 : 31743 1 1025 [ 1 1 1 1 1 1 1 1 1 1 0 1 1 3 ]
#4 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ]
#5 : 31743 1 1025 [ 1 1 1 1 1 1 1 1 1 1 0 1 1 3 ]
#6 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ]
#7 : 31743 1 1025 [ 1 1 1 1 1 1 1 1 1 1 0 1 1 3 ]
#8 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ]
#9 : 31743 1 1025 [ 1 1 1 1 1 1 1 1 1 1 0 1 1 3 ]
#10 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ]
#11 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ]
There are some bgs that have 1024 blocks allocated. What are they for ?
Many thanks in advance
Jianchao
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