On Tue, Apr 29, 2014 at 10:06:51AM -0400, Brian Foster wrote:
> On Tue, Apr 29, 2014 at 07:04:59AM +1000, Dave Chinner wrote:
> > From: Dave Chinner <dchinner@xxxxxxxxxx>
> >
> > Currently the attribute code will not detect and correct errors in
> > the attribute tree. It also fails to validate the CRCs and headers
> > on remote attribute blocks. Ensure that all the attribute blocks are
> > CRC checked and that the processing functions understand the correct
> > block formats for decoding.
> >
> > Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
> > ---
> > repair/attr_repair.c | 45 +++++++++++++++++++++++++++++++++++++--------
> > 1 file changed, 37 insertions(+), 8 deletions(-)
> >
> > diff --git a/repair/attr_repair.c b/repair/attr_repair.c
> > index ba85ac2..9b57960 100644
> > --- a/repair/attr_repair.c
> > +++ b/repair/attr_repair.c
> > @@ -604,6 +604,7 @@ verify_da_path(xfs_mount_t *mp,
> > libxfs_putbuf(bp);
> > return(1);
> > }
> > +
> > /*
> > * update cursor, write out the *current* level if
> > * required. don't write out the descendant level
> > @@ -615,6 +616,8 @@ verify_da_path(xfs_mount_t *mp,
> > libxfs_writebuf(cursor->level[this_level].bp, 0);
> > else
> > libxfs_putbuf(cursor->level[this_level].bp);
> > +
> > + /* switch cursor to point at the new buffer we just read */
> > cursor->level[this_level].bp = bp;
> > cursor->level[this_level].dirty = 0;
> > cursor->level[this_level].bno = dabno;
> > @@ -624,6 +627,14 @@ verify_da_path(xfs_mount_t *mp,
> > cursor->level[this_level].n = newnode;
> > #endif
> > entry = cursor->level[this_level].index = 0;
> > +
> > + /*
> > + * We want to rewrite the buffer a CRC error seeing as it
> Nit: ^ "on a CRC error ..." ?
Will fix.
> > @@ -1555,7 +1584,7 @@ process_longform_attr(
> > case XFS_DA_NODE_MAGIC: /* btree-form attribute */
> > case XFS_DA3_NODE_MAGIC:
> > /* must do this now, to release block 0 before the traversal */
> > - if (repairlinks) {
> > + if (*repair || repairlinks) {
> > *repair = 1;
> > libxfs_writebuf(bp, 0);
> > } else
>
> repairlinks incorporates a !no_modify check, but *repair does not. It's
> incremented unconditionally if we find a CRC error. I suspect this means
> we now need a !no_modify check for the writebuf/putbuf check here, as is
> done in the alternate path at the end of the function.
I'll fix it. Christoph is right, we need a helper function for this.
Thanks!
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
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