Re: [PATCH 06/18] dumpe2fs: add switch to disable checksum verification

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On Sat, Jul 26, 2014 at 04:58:08PM -0400, Theodore Ts'o wrote:
> On Fri, Jul 25, 2014 at 05:34:16PM -0700, Darrick J. Wong wrote:
> > Add a -n switch to turn off checksum verification.
> 
> Instead of adding a -n flag, I wonder if the better thing to do is if
> the various functions that might return a checksum error error out, we
> print a warning message indicating checksum failure occured, and then
> retry with EXT2_FLAG_IGNORE_CSUM_ERRORS.  That is, either retry the
> ext2fs_open with the IGNORE_CSUM_ERRORS, or if the file system is
> already open, or in EXT2_FLAG_IGNORE_CSUM_ERRORS into fs->flags and
> then retry the ext2fs_read_bitmaps() or whatever.
> 
> What do you think?

My reason for this approach is that forcing the user to tack on "-n" makes it
less likely that a checksum error will be buried in the output and forgotten.

That said I don't have any objection to this approach either.  The checksum
complaint could be printed at the end.  I think the error message should also
tell the user to run e2fsck.

--D
> 
> 					- Ted
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