On Thu, Oct 26, 2017 at 07:03:15PM -0500, Eric Sandeen wrote:
> On 10/26/17 5:14 PM, Darrick J. Wong wrote:
> > From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> >
> > Back in 88b8e1d6d7 ("Make xfs_metadump more robust against bad data"),
> > metadump grew the ability to ignore a directory extent if it was longer
> > than 20 blocks. Presumably this was to protect metadump from dumping
> > absurdly long extents resulting from bmbt corruption, but it's certainly
> > possible to create a directory with an extent longer than 20 blocks.
> > Hilariously, the discards happen with no warning unless the caller
> > explicitly set -w.
> >
> > This was raised to 1000 blocks in 7431d134fe8 ("Increase default maximum
> > extent size for xfs_metadump when copying..."), but it's still possible
> > to create a directory with an extent longer than 1000 blocks.
> >
> > Increase the threshold to MAXEXTLEN blocks because it's totally valid
> > for the filesystem to create extents up to that length.
> >
> > Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> > Reviewed-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
>
> Thanks, I'll pull this in.
>
> Should we fix the noisiness so it doesn't require -w for
> warnings as well?
Yeah. Seeing as we can't have an extent that long anyway we could
possibly promote it to a flat out error message, at least if it's
set to 2097151.
--D
> -Eric
>
> > ---
> > db/metadump.c | 2 +-
> > man/man8/xfs_metadump.8 | 2 +-
> > 2 files changed, 2 insertions(+), 2 deletions(-)
> >
> >
> > diff --git a/db/metadump.c b/db/metadump.c
> > index 6dd06c3..8ffb90f 100644
> > --- a/db/metadump.c
> > +++ b/db/metadump.c
> > @@ -32,7 +32,7 @@
> > #include "field.h"
> > #include "dir2.h"
> >
> > -#define DEFAULT_MAX_EXT_SIZE 1000
> > +#define DEFAULT_MAX_EXT_SIZE MAXEXTLEN
> >
> > /*
> > * It's possible that multiple files in a directory (or attributes
> > diff --git a/man/man8/xfs_metadump.8 b/man/man8/xfs_metadump.8
> > index 3731d6a..7207c20 100644
> > --- a/man/man8/xfs_metadump.8
> > +++ b/man/man8/xfs_metadump.8
> > @@ -114,7 +114,7 @@ copied.
> > .B \-m
> > Set the maximum size of an allowed metadata extent. Extremely large metadata
> > extents are likely to be corrupt, and will be skipped if they exceed
> > -this value. The default size is 1000 blocks.
> > +this value. The default size is 2097151 blocks.
> > .TP
> > .B \-o
> > Disables obfuscation of file names and extended attributes.
> >
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