On Wed, Oct 14, 2020 at 03:45:50PM +0800, Gao Xiang wrote: > Introduce a common helper to consolidate stripe validation process. > Also make kernel code xfs_validate_sb_common() use it first. > > Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxx> > --- Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx> > [v3 RESEND]: > sorry forget to drop a pair of unnecessary brace brackets. > > v2: https://lore.kernel.org/r/20201013034853.28236-1-hsiangkao@xxxxxxxxxx > > Changes since v2: > - update the expression on sb_unit and hasdalign check (Brian); > - drop parentheses since modulus operation is a basic > math operation (Brian); > - (I missed earlier..) avoid div_s64_rem on modulus operation > by checking swidth, sunit range first and casting to 32-bit > integer. since sunit/swidth in the callers are in FSB or BB, > so need to check the overflow first... > > Anyway, since logic change is made due to div_s64_rem() issue, > please kindly help review again... > > Thanks, > Gao Xiang > > fs/xfs/libxfs/xfs_sb.c | 77 ++++++++++++++++++++++++++++++++++++------ > fs/xfs/libxfs/xfs_sb.h | 3 ++ > 2 files changed, 69 insertions(+), 11 deletions(-) > > diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c > index 5aeafa59ed27..2078f4fe93b2 100644 > --- a/fs/xfs/libxfs/xfs_sb.c > +++ b/fs/xfs/libxfs/xfs_sb.c > @@ -360,21 +360,18 @@ xfs_validate_sb_common( > } > } > > - if (sbp->sb_unit) { > - if (!xfs_sb_version_hasdalign(sbp) || > - sbp->sb_unit > sbp->sb_width || > - (sbp->sb_width % sbp->sb_unit) != 0) { > - xfs_notice(mp, "SB stripe unit sanity check failed"); > - return -EFSCORRUPTED; > - } > - } else if (xfs_sb_version_hasdalign(sbp)) { > + /* > + * Either (sb_unit and !hasdalign) or (!sb_unit and hasdalign) > + * would imply the image is corrupted. > + */ > + if (!!sbp->sb_unit ^ xfs_sb_version_hasdalign(sbp)) { > xfs_notice(mp, "SB stripe alignment sanity check failed"); > return -EFSCORRUPTED; > - } else if (sbp->sb_width) { > - xfs_notice(mp, "SB stripe width sanity check failed"); > - return -EFSCORRUPTED; > } > > + if (!xfs_validate_stripe_geometry(mp, XFS_FSB_TO_B(mp, sbp->sb_unit), > + XFS_FSB_TO_B(mp, sbp->sb_width), 0, false)) > + return -EFSCORRUPTED; > > if (xfs_sb_version_hascrc(&mp->m_sb) && > sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) { > @@ -1233,3 +1230,61 @@ xfs_sb_get_secondary( > *bpp = bp; > return 0; > } > + > +/* > + * sunit, swidth, sectorsize(optional with 0) should be all in bytes, > + * so users won't be confused by values in error messages. > + */ > +bool > +xfs_validate_stripe_geometry( > + struct xfs_mount *mp, > + __s64 sunit, > + __s64 swidth, > + int sectorsize, > + bool silent) > +{ > + if (swidth > INT_MAX) { > + if (!silent) > + xfs_notice(mp, > +"stripe width (%lld) is too large", swidth); > + return false; > + } > + > + if (sunit > swidth) { > + if (!silent) > + xfs_notice(mp, > +"stripe unit (%lld) is larger than the stripe width (%lld)", sunit, swidth); > + return false; > + } > + > + if (sectorsize && (int)sunit % sectorsize) { > + if (!silent) > + xfs_notice(mp, > +"stripe unit (%lld) must be a multiple of the sector size (%d)", > + sunit, sectorsize); > + return false; > + } > + > + if (sunit && !swidth) { > + if (!silent) > + xfs_notice(mp, > +"invalid stripe unit (%lld) and stripe width of 0", sunit); > + return false; > + } > + > + if (!sunit && swidth) { > + if (!silent) > + xfs_notice(mp, > +"invalid stripe width (%lld) and stripe unit of 0", swidth); > + return false; > + } > + > + if (sunit && (int)swidth % (int)sunit) { > + if (!silent) > + xfs_notice(mp, > +"stripe width (%lld) must be a multiple of the stripe unit (%lld)", > + swidth, sunit); > + return false; > + } > + return true; > +} > diff --git a/fs/xfs/libxfs/xfs_sb.h b/fs/xfs/libxfs/xfs_sb.h > index 92465a9a5162..f79f9dc632b6 100644 > --- a/fs/xfs/libxfs/xfs_sb.h > +++ b/fs/xfs/libxfs/xfs_sb.h > @@ -42,4 +42,7 @@ extern int xfs_sb_get_secondary(struct xfs_mount *mp, > struct xfs_trans *tp, xfs_agnumber_t agno, > struct xfs_buf **bpp); > > +extern bool xfs_validate_stripe_geometry(struct xfs_mount *mp, > + __s64 sunit, __s64 swidth, int sectorsize, bool silent); > + > #endif /* __XFS_SB_H__ */ > -- > 2.18.1 >
