From: Darrick J. Wong <djwong@xxxxxxxxxx>
Create a helper function to ensure that CoW staging extent records have
a single refcount and that shared extent records have more than 1
refcount. We'll put this to more use in the next patch.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_refcount.c | 5 +----
fs/xfs/libxfs/xfs_refcount.h | 12 ++++++++++++
fs/xfs/scrub/refcount.c | 10 ++++------
3 files changed, 17 insertions(+), 10 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c
index 8d0417565b9d..586c58b5a557 100644
--- a/fs/xfs/libxfs/xfs_refcount.c
+++ b/fs/xfs/libxfs/xfs_refcount.c
@@ -142,10 +142,7 @@ xfs_refcount_get_rec(
if (irec->rc_blockcount == 0 || irec->rc_blockcount > MAXREFCEXTLEN)
goto out_bad_rec;
- /* handle special COW-staging domain */
- if (irec->rc_domain == XFS_REFC_DOMAIN_COW && irec->rc_refcount != 1)
- goto out_bad_rec;
- if (irec->rc_domain == XFS_REFC_DOMAIN_SHARED && irec->rc_refcount < 2)
+ if (!xfs_refcount_check_domain(irec))
goto out_bad_rec;
/* check for valid extent range, including overflow */
diff --git a/fs/xfs/libxfs/xfs_refcount.h b/fs/xfs/libxfs/xfs_refcount.h
index ca3ffe11a452..d666a0e32659 100644
--- a/fs/xfs/libxfs/xfs_refcount.h
+++ b/fs/xfs/libxfs/xfs_refcount.h
@@ -55,6 +55,18 @@ struct xfs_refcount_intent {
xfs_fsblock_t ri_startblock;
};
+/* Check that the refcount is appropriate for the record domain. */
+static inline bool
+xfs_refcount_check_domain(
+ const struct xfs_refcount_irec *irec)
+{
+ if (irec->rc_domain == XFS_REFC_DOMAIN_COW && irec->rc_refcount != 1)
+ return false;
+ if (irec->rc_domain == XFS_REFC_DOMAIN_SHARED && irec->rc_refcount < 2)
+ return false;
+ return true;
+}
+
void xfs_refcount_increase_extent(struct xfs_trans *tp,
struct xfs_bmbt_irec *irec);
void xfs_refcount_decrease_extent(struct xfs_trans *tp,
diff --git a/fs/xfs/scrub/refcount.c b/fs/xfs/scrub/refcount.c
index 6adc645060e7..98c033072120 100644
--- a/fs/xfs/scrub/refcount.c
+++ b/fs/xfs/scrub/refcount.c
@@ -337,14 +337,12 @@ xchk_refcountbt_rec(
xfs_refcount_btrec_to_irec(rec, &irec);
- /* Only CoW records can have refcount == 1. */
- if (irec.rc_domain == XFS_REFC_DOMAIN_SHARED && irec.rc_refcount == 1)
+ /* Check the domain and refcount are not incompatible. */
+ if (!xfs_refcount_check_domain(&irec))
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
- if (irec.rc_domain == XFS_REFC_DOMAIN_COW) {
- if (irec.rc_refcount != 1)
- xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
+
+ if (irec.rc_domain == XFS_REFC_DOMAIN_COW)
(*cow_blocks) += irec.rc_blockcount;
- }
/* Check the extent. */
if (irec.rc_startblock + irec.rc_blockcount <= irec.rc_startblock ||
