On Fri, Dec 04, 2020 at 01:12:06AM +0000, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
>
> When we recover a refcount intent from the log, we need to validate its
> contents before we try to replay them. Hoist the checking code into a
> separate function in preparation to refactor this code to use validation
> helpers.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
> ---
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
> fs/xfs/xfs_refcount_item.c | 57 ++++++++++++++++++++++++++++----------------
> 1 file changed, 36 insertions(+), 21 deletions(-)
>
>
> diff --git a/fs/xfs/xfs_refcount_item.c b/fs/xfs/xfs_refcount_item.c
> index 7529eb63ce94..a456a2fb794c 100644
> --- a/fs/xfs/xfs_refcount_item.c
> +++ b/fs/xfs/xfs_refcount_item.c
> @@ -417,6 +417,38 @@ const struct xfs_defer_op_type xfs_refcount_update_defer_type = {
> .cancel_item = xfs_refcount_update_cancel_item,
> };
>
> +/* Is this recovered CUI ok? */
> +static inline bool
> +xfs_cui_validate_phys(
> + struct xfs_mount *mp,
> + struct xfs_phys_extent *refc)
> +{
> + xfs_fsblock_t startblock_fsb;
> + bool op_ok;
> +
> + startblock_fsb = XFS_BB_TO_FSB(mp,
> + XFS_FSB_TO_DADDR(mp, refc->pe_startblock));
> + switch (refc->pe_flags & XFS_REFCOUNT_EXTENT_TYPE_MASK) {
> + case XFS_REFCOUNT_INCREASE:
> + case XFS_REFCOUNT_DECREASE:
> + case XFS_REFCOUNT_ALLOC_COW:
> + case XFS_REFCOUNT_FREE_COW:
> + op_ok = true;
> + break;
> + default:
> + op_ok = false;
> + break;
> + }
> + if (!op_ok || startblock_fsb == 0 ||
> + refc->pe_len == 0 ||
> + startblock_fsb >= mp->m_sb.sb_dblocks ||
> + refc->pe_len >= mp->m_sb.sb_agblocks ||
> + (refc->pe_flags & ~XFS_REFCOUNT_EXTENT_FLAGS))
> + return false;
> +
> + return true;
> +}
> +
> /*
> * Process a refcount update intent item that was recovered from the log.
> * We need to update the refcountbt.
> @@ -433,11 +465,9 @@ xfs_cui_item_recover(
> struct xfs_trans *tp;
> struct xfs_btree_cur *rcur = NULL;
> struct xfs_mount *mp = lip->li_mountp;
> - xfs_fsblock_t startblock_fsb;
> xfs_fsblock_t new_fsb;
> xfs_extlen_t new_len;
> unsigned int refc_type;
> - bool op_ok;
> bool requeue_only = false;
> enum xfs_refcount_intent_type type;
> int i;
> @@ -449,26 +479,11 @@ xfs_cui_item_recover(
> * just toss the CUI.
> */
> for (i = 0; i < cuip->cui_format.cui_nextents; i++) {
> - refc = &cuip->cui_format.cui_extents[i];
> - startblock_fsb = XFS_BB_TO_FSB(mp,
> - XFS_FSB_TO_DADDR(mp, refc->pe_startblock));
> - switch (refc->pe_flags & XFS_REFCOUNT_EXTENT_TYPE_MASK) {
> - case XFS_REFCOUNT_INCREASE:
> - case XFS_REFCOUNT_DECREASE:
> - case XFS_REFCOUNT_ALLOC_COW:
> - case XFS_REFCOUNT_FREE_COW:
> - op_ok = true;
> - break;
> - default:
> - op_ok = false;
> - break;
> - }
> - if (!op_ok || startblock_fsb == 0 ||
> - refc->pe_len == 0 ||
> - startblock_fsb >= mp->m_sb.sb_dblocks ||
> - refc->pe_len >= mp->m_sb.sb_agblocks ||
> - (refc->pe_flags & ~XFS_REFCOUNT_EXTENT_FLAGS))
> + if (!xfs_cui_validate_phys(mp,
> + &cuip->cui_format.cui_extents[i])) {
> + XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp);
> return -EFSCORRUPTED;
> + }
> }
>
> /*
>
