Different value in journal block after crash?

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













-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• Prev by Date: Re: [1/9] driver core fixes: make_class_name() retval check
• Next by Date: Make kernel -dirty naming optional
• Previous by thread: [6/9] driver core fixes: device_add() cleanup on error
• Next by thread: Make kernel -dirty naming optional
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]