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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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