Merge tag 'repair-fixes-6.10_2024-04-23' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into xfs-6.10-mergeC

xfs: minor fixes to online repair

Here are some miscellaneous bug fixes for the online repair code.

Signed-off-by: Darrick J. Wong <[email protected]>
Signed-off-by: Chandan Babu R <[email protected]>

* tag 'repair-fixes-6.10_2024-04-23' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux:
  xfs: invalidate dentries for a file before moving it to the orphanage
  xfs: exchange-range for repairs is no longer dynamic
  xfs: fix iunlock calls in xrep_adoption_trans_alloc
  xfs: drop the scrub file's iolock when transaction allocation fails

Author: Chandan Babu R

fs/xfs/scrub/attr_repair.c

@@ -1630,6 +1630,9 @@ xrep_xattr(
 	/* The rmapbt is required to reap the old attr fork. */
 	if (!xfs_has_rmapbt(sc->mp))
 		return -EOPNOTSUPP;
+	/* We require atomic file exchange range to rebuild anything. */
+	if (!xfs_has_exchange_range(sc->mp))
+		return -EOPNOTSUPP;
 
 	error = xrep_xattr_setup_scan(sc, &rx);
 	if (error)

fs/xfs/scrub/dir_repair.c

@@ -1993,6 +1993,9 @@ xrep_directory(
 	/* The rmapbt is required to reap the old data fork. */
 	if (!xfs_has_rmapbt(sc->mp))
 		return -EOPNOTSUPP;
+	/* We require atomic file exchange range to rebuild anything. */
+	if (!xfs_has_exchange_range(sc->mp))
+		return -EOPNOTSUPP;
 
 	error = xrep_dir_setup_scan(rd);
 	if (error)

fs/xfs/scrub/nlinks_repair.c

@@ -138,8 +138,10 @@ xrep_nlinks_repair_inode(
 
 		error = xfs_trans_alloc(mp, &M_RES(mp)->tr_link, 0, 0, 0,
 				&sc->tp);
-		if (error)
+		if (error) {
+			xchk_iunlock(sc, XFS_IOLOCK_EXCL);
 			return error;
+		}
 
 		xchk_ilock(sc, XFS_ILOCK_EXCL);
 		xfs_trans_ijoin(sc->tp, ip, 0);

fs/xfs/scrub/orphanage.c

@@ -382,7 +382,7 @@ xrep_adoption_trans_alloc(
 out_cancel:
 	xchk_trans_cancel(sc);
 	xrep_orphanage_iunlock(sc, XFS_ILOCK_EXCL);
-	xrep_orphanage_iunlock(sc, XFS_IOLOCK_EXCL);
+	xchk_iunlock(sc, XFS_ILOCK_EXCL);
 	return error;
 }
 
@@ -434,16 +434,17 @@ xrep_adoption_check_dcache(
 {
 	struct qstr		qname = QSTR_INIT(adopt->xname->name,
 						  adopt->xname->len);
+	struct xfs_scrub	*sc = adopt->sc;
 	struct dentry		*d_orphanage, *d_child;
 	int			error = 0;
 
-	d_orphanage = d_find_alias(VFS_I(adopt->sc->orphanage));
+	d_orphanage = d_find_alias(VFS_I(sc->orphanage));
 	if (!d_orphanage)
 		return 0;
 
 	d_child = d_hash_and_lookup(d_orphanage, &qname);
 	if (d_child) {
-		trace_xrep_adoption_check_child(adopt->sc->mp, d_child);
+		trace_xrep_adoption_check_child(sc->mp, d_child);
 
 		if (d_is_positive(d_child)) {
 			ASSERT(d_is_negative(d_child));
@@ -454,49 +455,33 @@ xrep_adoption_check_dcache(
 	}
 
 	dput(d_orphanage);
-	if (error)
-		return error;
-
-	/*
-	 * Do we need to update d_parent of the dentry for the file being
-	 * repaired?  There shouldn't be a hashed dentry with a parent since
-	 * the file had nonzero nlink but wasn't connected to any parent dir.
-	 */
-	d_child = d_find_alias(VFS_I(adopt->sc->ip));
-	if (!d_child)
-		return 0;
-
-	trace_xrep_adoption_check_alias(adopt->sc->mp, d_child);
-
-	if (d_child->d_parent && !d_unhashed(d_child)) {
-		ASSERT(d_child->d_parent == NULL || d_unhashed(d_child));
-		error = -EFSCORRUPTED;
-	}
-
-	dput(d_child);
 	return error;
 }
 
 /*
- * Remove all negative dentries from the dcache.  There should not be any
- * positive entries, since we've maintained our lock on the orphanage
- * directory.
+ * Invalidate all dentries for the name that was added to the orphanage
+ * directory, and all dentries pointing to the child inode that was moved.
+ *
+ * There should not be any positive entries for the name, since we've
+ * maintained our lock on the orphanage directory.
  */
 static void
 xrep_adoption_zap_dcache(
 	struct xrep_adoption	*adopt)
 {
 	struct qstr		qname = QSTR_INIT(adopt->xname->name,
 						  adopt->xname->len);
+	struct xfs_scrub	*sc = adopt->sc;
 	struct dentry		*d_orphanage, *d_child;
 
-	d_orphanage = d_find_alias(VFS_I(adopt->sc->orphanage));
+	/* Invalidate all dentries for the adoption name */
+	d_orphanage = d_find_alias(VFS_I(sc->orphanage));
 	if (!d_orphanage)
 		return;
 
 	d_child = d_hash_and_lookup(d_orphanage, &qname);
 	while (d_child != NULL) {
-		trace_xrep_adoption_invalidate_child(adopt->sc->mp, d_child);
+		trace_xrep_adoption_invalidate_child(sc->mp, d_child);
 
 		ASSERT(d_is_negative(d_child));
 		d_invalidate(d_child);
@@ -505,6 +490,14 @@ xrep_adoption_zap_dcache(
 	}
 
 	dput(d_orphanage);
+
+	/* Invalidate all the dentries pointing down to this file. */
+	while ((d_child = d_find_alias(VFS_I(sc->ip))) != NULL) {
+		trace_xrep_adoption_invalidate_child(sc->mp, d_child);
+
+		d_invalidate(d_child);
+		dput(d_child);
+	}
 }
 
 /*

fs/xfs/scrub/parent_repair.c

@@ -1571,10 +1571,14 @@ xrep_parent(
 	/*
 	 * When the parent pointers feature is enabled, repairs are committed
 	 * by atomically committing a new xattr structure and reaping the old
-	 * attr fork.  Reaping requires rmap to be enabled.
+	 * attr fork.  Reaping requires rmap and exchange-range to be enabled.
 	 */
-	if (xfs_has_parent(sc->mp) && !xfs_has_rmapbt(sc->mp))
-		return -EOPNOTSUPP;
+	if (xfs_has_parent(sc->mp)) {
+		if (!xfs_has_rmapbt(sc->mp))
+			return -EOPNOTSUPP;
+		if (!xfs_has_exchange_range(sc->mp))
+			return -EOPNOTSUPP;
+	}
 
 	error = xrep_parent_setup_scan(rp);
 	if (error)

fs/xfs/scrub/rtsummary_repair.c

@@ -62,12 +62,7 @@ xrep_setup_rtsummary(
 		return -EOPNOTSUPP;
 
 	rts->resblks += blocks;
-
-	/*
-	 * Grab support for atomic file content exchanges before we allocate
-	 * any transactions or grab ILOCKs.
-	 */
-	return xrep_tempexch_enable(sc);
+	return 0;
 }
 
 static int
@@ -111,6 +106,9 @@ xrep_rtsummary(
 	/* We require the rmapbt to rebuild anything. */
 	if (!xfs_has_rmapbt(mp))
 		return -EOPNOTSUPP;
+	/* We require atomic file exchange range to rebuild anything. */
+	if (!xfs_has_exchange_range(mp))
+		return -EOPNOTSUPP;
 
 	/* Walk away if we disagree on the size of the rt bitmap. */
 	if (rts->rbmblocks != mp->m_sb.sb_rbmblocks)

fs/xfs/scrub/scrub.c

@@ -154,15 +154,14 @@ xchk_probe(
 
 /* Scrub setup and teardown */
 
-#define FSGATES_MASK	(XCHK_FSGATES_ALL | XREP_FSGATES_ALL)
 static inline void
 xchk_fsgates_disable(
 	struct xfs_scrub	*sc)
 {
-	if (!(sc->flags & FSGATES_MASK))
+	if (!(sc->flags & XCHK_FSGATES_ALL))
 		return;
 
-	trace_xchk_fsgates_disable(sc, sc->flags & FSGATES_MASK);
+	trace_xchk_fsgates_disable(sc, sc->flags & XCHK_FSGATES_ALL);
 
 	if (sc->flags & XCHK_FSGATES_DRAIN)
 		xfs_drain_wait_disable();
@@ -176,9 +175,8 @@ xchk_fsgates_disable(
 	if (sc->flags & XCHK_FSGATES_RMAP)
 		xfs_rmap_hook_disable();
 
-	sc->flags &= ~FSGATES_MASK;
+	sc->flags &= ~XCHK_FSGATES_ALL;
 }
-#undef FSGATES_MASK
 
 /* Free the resources associated with a scrub subtype. */
 void

fs/xfs/scrub/scrub.h

@@ -188,7 +188,6 @@ struct xfs_scrub {
 #define XCHK_FSGATES_QUOTA	(1U << 4)  /* quota live update enabled */
 #define XCHK_FSGATES_DIRENTS	(1U << 5)  /* directory live update enabled */
 #define XCHK_FSGATES_RMAP	(1U << 6)  /* rmapbt live update enabled */
-#define XREP_FSGATES_EXCHANGE_RANGE (1U << 29) /* uses file content exchange */
 #define XREP_RESET_PERAG_RESV	(1U << 30) /* must reset AG space reservation */
 #define XREP_ALREADY_FIXED	(1U << 31) /* checking our repair work */
 
@@ -203,12 +202,6 @@ struct xfs_scrub {
 				 XCHK_FSGATES_DIRENTS | \
 				 XCHK_FSGATES_RMAP)
 
-/*
- * The sole XREP_FSGATES* flag reflects a log intent item that is protected
- * by a log-incompat feature flag.  No code patching in use here.
- */
-#define XREP_FSGATES_ALL	(XREP_FSGATES_EXCHANGE_RANGE)
-
 struct xfs_scrub_subord {
 	struct xfs_scrub	sc;
 	struct xfs_scrub	*parent_sc;

fs/xfs/scrub/symlink_repair.c

@@ -490,6 +490,9 @@ xrep_symlink(
 	/* The rmapbt is required to reap the old data fork. */
 	if (!xfs_has_rmapbt(sc->mp))
 		return -EOPNOTSUPP;
+	/* We require atomic file exchange range to rebuild anything. */
+	if (!xfs_has_exchange_range(sc->mp))
+		return -EOPNOTSUPP;
 
 	ASSERT(sc->ilock_flags & XFS_ILOCK_EXCL);
 

fs/xfs/scrub/tempexch.h

@@ -11,7 +11,6 @@ struct xrep_tempexch {
 	struct xfs_exchmaps_req	req;
 };
 
-int xrep_tempexch_enable(struct xfs_scrub *sc);
 int xrep_tempexch_trans_reserve(struct xfs_scrub *sc, int whichfork,
 		struct xrep_tempexch *ti);
 int xrep_tempexch_trans_alloc(struct xfs_scrub *sc, int whichfork,