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Re: If the .journal file is marked 'immutable' how is data written to it



Yusuf Goolamabbas wrote:
> 
> man chattr mentions the following [on RH 7.2]
> 
> A  file with the `i' attribute cannot be modified: it cannot be deleted
> or renamed, no link can be created to  this file  and  no  data  can  be
> written to the file. Only the superuser can set or clear this attribute
> 
> The .journal file has the following properties
> 
> ---i-d------- ../.journal
> 
> As such, I am confused as to how data to the journal can be written,
> does ext3 internal clear/reset the immutable flag before all writes to
> the journal

The filesystem accesses the journal fail at a way, way lower
level than the immutable checks.  It just uses the journal
file as an offset->block mapping and talks direct to the
block layer.





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