On Tue, Apr 29, 2014 at 07:04:58AM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
>
> We can't really repair broken symlink buffer contents, but we can at
> least warn about it and correct the CRC error so the symlink is
> again readable.
>
> Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
> ---
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
> repair/dinode.c | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/repair/dinode.c b/repair/dinode.c
> index b086bec..8891e84 100644
> --- a/repair/dinode.c
> +++ b/repair/dinode.c
> @@ -1254,6 +1254,7 @@ process_symlink_remote(
> while (pathlen > 0) {
> int blk_cnt = 1;
> int byte_cnt;
> + int badcrc = 0;
>
> fsbno = blkmap_get(blkmap, i);
> if (fsbno == NULLDFSBNO) {
> @@ -1284,6 +1285,12 @@ _("cannot read inode %" PRIu64 ", file block %d, disk block %" PRIu64 "\n"),
> lino, i, fsbno);
> return 1;
> }
> + if (bp->b_error == EFSBADCRC) {
> + do_warn(
> +_("Bad symlink buffer CRC, block %" PRIu64 ", inode %" PRIu64 ".\n"
> + "Correcting CRC, but symlink may be bad.\n"), fsbno, lino);
> + badcrc = 1;
> + }
>
> byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
> byte_cnt = MIN(pathlen, byte_cnt);
> @@ -1307,7 +1314,10 @@ _("bad symlink header ino %" PRIu64 ", file block %d, disk block %" PRIu64 "\n")
> offset += byte_cnt;
> i++;
>
> - libxfs_putbuf(bp);
> + if (badcrc && !no_modify)
> + libxfs_writebuf(bp, 0);
> + else
> + libxfs_putbuf(bp);
> }
> return 0;
> }
> --
> 1.9.0
>
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