xfs: hoist recovered extent-free intent checks out of xfs_efi_item_recover

When we recover a extent-free intent from the log, we need to validate
its contents before we try to replay them.  Hoist the checking code into
a separate function so that we can fix some problems and then add
realtime support.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

1 files changed, 21 insertions, 10 deletions

diff --git a/fs/xfs/xfs_extfree_item.c b/fs/xfs/xfs_extfree_item.c
index 12401cf62131..efafa311b2b6 100644
--- a/fs/xfs/xfs_extfree_item.c
+++ b/fs/xfs/xfs_extfree_item.c
@@ -576,6 +576,25 @@ const struct xfs_defer_op_type xfs_agfl_free_defer_type = {
 	.cancel_item	= xfs_extent_free_cancel_item,
 };
 
+/* Is this recovered EFI ok? */
+static inline bool
+xfs_efi_validate_ext(
+	struct xfs_mount		*mp,
+	struct xfs_extent		*extp)
+{
+	xfs_fsblock_t			startblock_fsb;
+
+	startblock_fsb = XFS_BB_TO_FSB(mp,
+			   XFS_FSB_TO_DADDR(mp, extp->ext_start));
+	if (startblock_fsb == 0 ||
+	    extp->ext_len == 0 ||
+	    startblock_fsb >= mp->m_sb.sb_dblocks ||
+	    extp->ext_len >= mp->m_sb.sb_agblocks)
+		return false;
+
+	return true;
+}
+
 /*
  * Process an extent free intent item that was recovered from
  * the log.  We need to free the extents that it describes.
@@ -590,7 +609,6 @@ xfs_efi_item_recover(
 	struct xfs_efd_log_item		*efdp;
 	struct xfs_trans		*tp;
 	struct xfs_extent		*extp;
-	xfs_fsblock_t			startblock_fsb;
 	int				i;
 	int				error = 0;
 
@@ -599,16 +617,9 @@ xfs_efi_item_recover(
 	 * EFI.  If any are bad, then assume that all are bad and
 	 * just toss the EFI.
 	 */
-	for (i = 0; i < efip->efi_format.efi_nextents; i++) {
-		extp = &efip->efi_format.efi_extents[i];
-		startblock_fsb = XFS_BB_TO_FSB(mp,
-				   XFS_FSB_TO_DADDR(mp, extp->ext_start));
-		if (startblock_fsb == 0 ||
-		    extp->ext_len == 0 ||
-		    startblock_fsb >= mp->m_sb.sb_dblocks ||
-		    extp->ext_len >= mp->m_sb.sb_agblocks)
+	for (i = 0; i < efip->efi_format.efi_nextents; i++)
+		if (!xfs_efi_validate_ext(mp, &efip->efi_format.efi_extents[i]))
 			return -EFSCORRUPTED;
-	}
 
 	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
 	if (error)