xfs: support logging EFIs for realtime extents

Teach the EFI mechanism how to free realtime extents.  We're going to
need this to enforce proper ordering of operations when we enable
realtime rmap.

Declare a new log intent item type (XFS_LI_EFI_RT) and a separate defer
ops for rt extents.  This keeps the ondisk artifacts and processing code
completely separate between the rt and non-rt cases.  Hopefully this
will make it easier to debug filesystem problems.

Signed-off-by: Darrick J. Wong <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>

Author: Darrick J. Wong

fs/xfs/libxfs/xfs_alloc.c

@@ -2648,8 +2648,17 @@ xfs_defer_extent_free(
 	ASSERT(!isnullstartblock(bno));
 	ASSERT(!(free_flags & ~XFS_FREE_EXTENT_ALL_FLAGS));
 
-	if (XFS_IS_CORRUPT(mp, !xfs_verify_fsbext(mp, bno, len)))
-		return -EFSCORRUPTED;
+	if (free_flags & XFS_FREE_EXTENT_REALTIME) {
+		if (type != XFS_AG_RESV_NONE) {
+			ASSERT(type == XFS_AG_RESV_NONE);
+			return -EFSCORRUPTED;
+		}
+		if (XFS_IS_CORRUPT(mp, !xfs_verify_rtbext(mp, bno, len)))
+			return -EFSCORRUPTED;
+	} else {
+		if (XFS_IS_CORRUPT(mp, !xfs_verify_fsbext(mp, bno, len)))
+			return -EFSCORRUPTED;
+	}
 
 	xefi = kmem_cache_zalloc(xfs_extfree_item_cache,
 			       GFP_KERNEL | __GFP_NOFAIL);
@@ -2658,6 +2667,8 @@ xfs_defer_extent_free(
 	xefi->xefi_agresv = type;
 	if (free_flags & XFS_FREE_EXTENT_SKIP_DISCARD)
 		xefi->xefi_flags |= XFS_EFI_SKIP_DISCARD;
+	if (free_flags & XFS_FREE_EXTENT_REALTIME)
+		xefi->xefi_flags |= XFS_EFI_REALTIME;
 	if (oinfo) {
 		ASSERT(oinfo->oi_offset == 0);
 

fs/xfs/libxfs/xfs_alloc.h

@@ -237,7 +237,11 @@ int xfs_free_extent_later(struct xfs_trans *tp, xfs_fsblock_t bno,
 /* Don't issue a discard for the blocks freed. */
 #define XFS_FREE_EXTENT_SKIP_DISCARD	(1U << 0)
 
-#define XFS_FREE_EXTENT_ALL_FLAGS	(XFS_FREE_EXTENT_SKIP_DISCARD)
+/* Free blocks on the realtime device. */
+#define XFS_FREE_EXTENT_REALTIME	(1U << 1)
+
+#define XFS_FREE_EXTENT_ALL_FLAGS	(XFS_FREE_EXTENT_SKIP_DISCARD | \
+					 XFS_FREE_EXTENT_REALTIME)
 
 /*
  * List of extents to be free "later".
@@ -257,6 +261,12 @@ struct xfs_extent_free_item {
 #define XFS_EFI_ATTR_FORK	(1U << 1) /* freeing attr fork block */
 #define XFS_EFI_BMBT_BLOCK	(1U << 2) /* freeing bmap btree block */
 #define XFS_EFI_CANCELLED	(1U << 3) /* dont actually free the space */
+#define XFS_EFI_REALTIME	(1U << 4) /* freeing realtime extent */
+
+static inline bool xfs_efi_is_realtime(const struct xfs_extent_free_item *xefi)
+{
+	return xefi->xefi_flags & XFS_EFI_REALTIME;
+}
 
 struct xfs_alloc_autoreap {
 	struct xfs_defer_pending	*dfp;

fs/xfs/libxfs/xfs_defer.c

@@ -846,6 +846,12 @@ xfs_defer_add(
 
 	ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
 
+	if (!ops->finish_item) {
+		ASSERT(ops->finish_item != NULL);
+		xfs_force_shutdown(tp->t_mountp, SHUTDOWN_CORRUPT_INCORE);
+		return NULL;
+	}
+
 	dfp = xfs_defer_find_last(tp, ops);
 	if (!dfp || !xfs_defer_can_append(dfp, ops))
 		dfp = xfs_defer_alloc(&tp->t_dfops, ops);

fs/xfs/libxfs/xfs_defer.h

@@ -71,6 +71,7 @@ extern const struct xfs_defer_op_type xfs_refcount_update_defer_type;
 extern const struct xfs_defer_op_type xfs_rmap_update_defer_type;
 extern const struct xfs_defer_op_type xfs_extent_free_defer_type;
 extern const struct xfs_defer_op_type xfs_agfl_free_defer_type;
+extern const struct xfs_defer_op_type xfs_rtextent_free_defer_type;
 extern const struct xfs_defer_op_type xfs_attr_defer_type;
 extern const struct xfs_defer_op_type xfs_exchmaps_defer_type;
 

fs/xfs/libxfs/xfs_log_format.h

@@ -248,6 +248,8 @@ typedef struct xfs_trans_header {
 #define	XFS_LI_ATTRD		0x1247  /* attr set/remove done */
 #define	XFS_LI_XMI		0x1248  /* mapping exchange intent */
 #define	XFS_LI_XMD		0x1249  /* mapping exchange done */
+#define	XFS_LI_EFI_RT		0x124a	/* realtime extent free intent */
+#define	XFS_LI_EFD_RT		0x124b	/* realtime extent free done */
 
 #define XFS_LI_TYPE_DESC \
 	{ XFS_LI_EFI,		"XFS_LI_EFI" }, \
@@ -267,7 +269,9 @@ typedef struct xfs_trans_header {
 	{ XFS_LI_ATTRI,		"XFS_LI_ATTRI" }, \
 	{ XFS_LI_ATTRD,		"XFS_LI_ATTRD" }, \
 	{ XFS_LI_XMI,		"XFS_LI_XMI" }, \
-	{ XFS_LI_XMD,		"XFS_LI_XMD" }
+	{ XFS_LI_XMD,		"XFS_LI_XMD" }, \
+	{ XFS_LI_EFI_RT,	"XFS_LI_EFI_RT" }, \
+	{ XFS_LI_EFD_RT,	"XFS_LI_EFD_RT" }
 
 /*
  * Inode Log Item Format definitions.

fs/xfs/libxfs/xfs_log_recover.h

@@ -77,6 +77,8 @@ extern const struct xlog_recover_item_ops xlog_attri_item_ops;
 extern const struct xlog_recover_item_ops xlog_attrd_item_ops;
 extern const struct xlog_recover_item_ops xlog_xmi_item_ops;
 extern const struct xlog_recover_item_ops xlog_xmd_item_ops;
+extern const struct xlog_recover_item_ops xlog_rtefi_item_ops;
+extern const struct xlog_recover_item_ops xlog_rtefd_item_ops;
 
 /*
  * Macros, structures, prototypes for internal log manager use.