Messages in this thread | | | Date | Fri, 22 Sep 2006 18:58:38 +0900 | From | a287848 <> | Subject | Different value in journal block after crash? |
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Hi I'm moweon.
Now I'm making redundancy module in my jbd based file system.
When I tesed and dumped its block, I found one funny stuation.
First I modified */commit.c/* in jbd directory to print commit complete message and it's block number. ( add printk after wait_on_buffer )
After I saw this message from kernel just like this
(*NOTICE: Commit complete , its block number : 560 *)
I read its contents from block number 1 to 101 into file
And I read it again after suddenly turn off my work station.
, I think it must has same value becuase journal commit block was already written behind block number 101 .
But when I campared two file, it's different .
Why it happen? Does jbd use some trick in block management?
Dear
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