xfs: introduce a swap-extent log intent item

Introduce a new intent log item to handle swapping extents.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>

2 files changed, 64 insertions, 2 deletions

diff --git a/fs/xfs/libxfs/xfs_log_format.h b/fs/xfs/libxfs/xfs_log_format.h
index d92ec47f081b..1c316776429f 100644
--- a/fs/xfs/libxfs/xfs_log_format.h
+++ b/fs/xfs/libxfs/xfs_log_format.h
@@ -114,7 +114,9 @@ struct xfs_unmount_log_format {
 #define XLOG_REG_TYPE_CUD_FORMAT	24
 #define XLOG_REG_TYPE_BUI_FORMAT	25
 #define XLOG_REG_TYPE_BUD_FORMAT	26
-#define XLOG_REG_TYPE_MAX		26
+#define XLOG_REG_TYPE_SXI_FORMAT	27
+#define XLOG_REG_TYPE_SXD_FORMAT	28
+#define XLOG_REG_TYPE_MAX		28
 
 /*
  * Flags to log operation header
@@ -237,6 +239,8 @@ typedef struct xfs_trans_header {
 #define	XFS_LI_CUD		0x1243
 #define	XFS_LI_BUI		0x1244	/* bmbt update intent */
 #define	XFS_LI_BUD		0x1245
+#define	XFS_LI_SXI		0x1246
+#define	XFS_LI_SXD		0x1247
 
 #define XFS_LI_TYPE_DESC \
 	{ XFS_LI_EFI,		"XFS_LI_EFI" }, \
@@ -252,7 +256,9 @@ typedef struct xfs_trans_header {
 	{ XFS_LI_CUI,		"XFS_LI_CUI" }, \
 	{ XFS_LI_CUD,		"XFS_LI_CUD" }, \
 	{ XFS_LI_BUI,		"XFS_LI_BUI" }, \
-	{ XFS_LI_BUD,		"XFS_LI_BUD" }
+	{ XFS_LI_BUD,		"XFS_LI_BUD" }, \
+	{ XFS_LI_SXI,		"XFS_LI_SXI" }, \
+	{ XFS_LI_SXD,		"XFS_LI_SXD" }
 
 /*
  * Inode Log Item Format definitions.
@@ -791,6 +797,60 @@ struct xfs_bud_log_format {
 };
 
 /*
+ * SXI/SXD (extent swapping) log format definitions
+ */
+
+struct xfs_swap_extent {
+	uint64_t		sx_inode1;
+	uint64_t		sx_inode2;
+	uint64_t		sx_startoff1;
+	uint64_t		sx_startoff2;
+	uint64_t		sx_blockcount;
+	uint64_t		sx_flags;
+	int64_t			sx_isize1;
+	int64_t			sx_isize2;
+};
+
+/* Swap extents between extended attribute forks. */
+#define XFS_SWAP_EXT_ATTR_FORK		(1ULL << 0)
+
+/* Set the file sizes when finished. */
+#define XFS_SWAP_EXT_SET_SIZES		(1ULL << 1)
+
+/* Do not swap any part of the range where file1's mapping is a hole. */
+#define XFS_SWAP_EXT_SKIP_FILE1_HOLES	(1ULL << 2)
+
+#define XFS_SWAP_EXT_FLAGS		(XFS_SWAP_EXT_ATTR_FORK | \
+					 XFS_SWAP_EXT_SET_SIZES | \
+					 XFS_SWAP_EXT_SKIP_FILE1_HOLES)
+
+#define XFS_SWAP_EXT_STRINGS \
+	{ XFS_SWAP_EXT_ATTR_FORK,		"ATTRFORK" }, \
+	{ XFS_SWAP_EXT_SET_SIZES,		"SETSIZES" }, \
+	{ XFS_SWAP_EXT_SKIP_FILE1_HOLES,	"SKIP_FILE1_HOLES" }
+
+/* This is the structure used to lay out an sxi log item in the log. */
+struct xfs_sxi_log_format {
+	uint16_t		sxi_type;	/* sxi log item type */
+	uint16_t		sxi_size;	/* size of this item */
+	uint32_t		__pad;		/* must be zero */
+	uint64_t		sxi_id;		/* sxi identifier */
+	struct xfs_swap_extent	sxi_extent;	/* extent to swap */
+};
+
+/*
+ * This is the structure used to lay out an sxd log item in the
+ * log.  The sxd_extents array is a variable size array whose
+ * size is given by sxd_nextents;
+ */
+struct xfs_sxd_log_format {
+	uint16_t		sxd_type;	/* sxd log item type */
+	uint16_t		sxd_size;	/* size of this item */
+	uint32_t		__pad;
+	uint64_t		sxd_sxi_id;	/* id of corresponding bui */
+};
+
+/*
  * Dquot Log format definitions.
  *
  * The first two fields must be the type and size fitting into
diff --git a/fs/xfs/libxfs/xfs_log_recover.h b/fs/xfs/libxfs/xfs_log_recover.h
index ff69a0000817..cb8f17074bef 100644
--- a/fs/xfs/libxfs/xfs_log_recover.h
+++ b/fs/xfs/libxfs/xfs_log_recover.h
@@ -72,6 +72,8 @@ extern const struct xlog_recover_item_ops xlog_rui_item_ops;
 extern const struct xlog_recover_item_ops xlog_rud_item_ops;
 extern const struct xlog_recover_item_ops xlog_cui_item_ops;
 extern const struct xlog_recover_item_ops xlog_cud_item_ops;
+extern const struct xlog_recover_item_ops xlog_sxi_item_ops;
+extern const struct xlog_recover_item_ops xlog_sxd_item_ops;
 
 /*
  * Macros, structures, prototypes for internal log manager use.