Yusuf Goolamabbas
2002-Feb-08 02:09 UTC
If the .journal file is marked 'immutable' how is data written to it
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 -- Yusuf Goolamabbas yusufg@outblaze.com
Andrew Morton
2002-Feb-08 02:18 UTC
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 journalThe 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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