md: superblock changes for PPL

Include information about PPL location and size into mdp_superblock_1 and copy it to/from rdev. Because PPL is mutually exclusive with bitmap, put it in place of 'bitmap_offset'. Add a new flag MD_FEATURE_PPL for 'feature_map', analogically to MD_FEATURE_BITMAP_OFFSET. Add MD_HAS_PPL to mddev->flags to indicate that PPL is enabled on an array.

Artur Paszkiewicz committed 9 years ago

Commit ea0213e1 parent effe6ee5 files · +45 −6Browse files

Showing the changes to include/uapi/linux/raid (1 of 5 files). Show all

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include/uapi/linux/raid/md_p.h+14−4

 	__le32	chunksize;	/* in 512byte sectors */
 	__le32	raid_disks;
-	__le32	bitmap_offset;	/* sectors after start of superblock that bitmap starts
+	union {
-				 * NOTE: signed, so bitmap can be before superblock
+		__le32	bitmap_offset;	/* sectors after start of superblock that bitmap starts
-				 * only meaningful of feature_map[0] is set.
+					 * NOTE: signed, so bitmap can be before superblock
-				 */
+					 * only meaningful of feature_map[0] is set.
+					 */
+		/* only meaningful when feature_map[MD_FEATURE_PPL] is set */
+		struct {
+			__le16 offset; /* sectors from start of superblock that ppl starts (signed) */
+			__le16 size; /* ppl size in sectors */
+		} ppl;
+	};
 	/* These are only valid with feature bit '4' */
 	__le32	new_level;	/* new level we are reshaping to		*/
 					     */
 #define MD_FEATURE_CLUSTERED		256 /* clustered MD */
 #define	MD_FEATURE_JOURNAL		512 /* support write cache */
+#define	MD_FEATURE_PPL			1024 /* support PPL */
 #define	MD_FEATURE_ALL			(MD_FEATURE_BITMAP_OFFSET	\
 					|MD_FEATURE_RECOVERY_OFFSET	\
 					|MD_FEATURE_RESHAPE_ACTIVE	\
 					|MD_FEATURE_RECOVERY_BITMAP	\
 					|MD_FEATURE_CLUSTERED		\
 					|MD_FEATURE_JOURNAL		\
+					|MD_FEATURE_PPL			\
 					)
 struct r5l_payload_header {