X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Flinux%2Fraid%2Fmd_p.h;h=f1fbae7e390ec4f53d67fa54e244153768449061;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=8ba95d67329f0b6189d80795ee807f62e8ae17b7;hpb=cee37fe97739d85991964371c1f3a745c00dd236;p=linux-2.6.git

diff --git a/include/linux/raid/md_p.h b/include/linux/raid/md_p.h
index 8ba95d673..f1fbae7e3 100644
--- a/include/linux/raid/md_p.h
+++ b/include/linux/raid/md_p.h
@@ -79,6 +79,11 @@
 #define MD_DISK_SYNC		2 /* disk is in sync with the raid set */
 #define MD_DISK_REMOVED		3 /* disk is in sync with the raid set */
 
+#define	MD_DISK_WRITEMOSTLY	9 /* disk is "write-mostly" is RAID1 config.
+				   * read requests will only be sent here in
+				   * dire need
+				   */
+
 typedef struct mdp_device_descriptor_s {
 	__u32 number;		/* 0 Device number in the entire set	      */
 	__u32 major;		/* 1 Device major number		      */
@@ -96,6 +101,19 @@ typedef struct mdp_device_descriptor_s {
 #define MD_SB_CLEAN		0
 #define MD_SB_ERRORS		1
 
+#define	MD_SB_BITMAP_PRESENT	8 /* bitmap may be present nearby */
+
+/*
+ * Notes:
+ * - if an array is being reshaped (restriped) in order to change the
+ *   the number of active devices in the array, 'raid_disks' will be
+ *   the larger of the old and new numbers.  'delta_disks' will
+ *   be the "new - old".  So if +ve, raid_disks is the new value, and
+ *   "raid_disks-delta_disks" is the old.  If -ve, raid_disks is the
+ *   old value and "raid_disks+delta_disks" is the new (smaller) value.
+ */
+
+
 typedef struct mdp_superblock_s {
 	/*
 	 * Constant generic information
@@ -140,7 +158,13 @@ typedef struct mdp_superblock_s {
 	__u32 cp_events_hi;	/* 10 high-order of checkpoint update count   */
 #endif
 	__u32 recovery_cp;	/* 11 recovery checkpoint sector count	      */
-	__u32 gstate_sreserved[MD_SB_GENERIC_STATE_WORDS - 12];
+	/* There are only valid for minor_version > 90 */
+	__u64 reshape_position;	/* 12,13 next address in array-space for reshape */
+	__u32 new_level;	/* 14 new level we are reshaping to	      */
+	__u32 delta_disks;	/* 15 change in number of raid_disks	      */
+	__u32 new_layout;	/* 16 new layout			      */
+	__u32 new_chunk;	/* 17 new chunk size (bytes)		      */
+	__u32 gstate_sreserved[MD_SB_GENERIC_STATE_WORDS - 18];
 
 	/*
 	 * Personality information
@@ -184,7 +208,7 @@ struct mdp_superblock_1 {
 	/* constant array information - 128 bytes */
 	__u32	magic;		/* MD_SB_MAGIC: 0xa92b4efc - little endian */
 	__u32	major_version;	/* 1 */
-	__u32	feature_map;	/* 0 for now */
+	__u32	feature_map;	/* bit 0 set if 'bitmap_offset' is meaningful */
 	__u32	pad0;		/* always set to 0 when writing */
 
 	__u8	set_uuid[16];	/* user-space generated. */
@@ -192,12 +216,23 @@ struct mdp_superblock_1 {
 
 	__u64	ctime;		/* lo 40 bits are seconds, top 24 are microseconds or 0*/
 	__u32	level;		/* -4 (multipath), -1 (linear), 0,1,4,5 */
-	__u32	layout;		/* only for raid5 currently */
+	__u32	layout;		/* only for raid5 and raid10 currently */
 	__u64	size;		/* used size of component devices, in 512byte sectors */
 
 	__u32	chunksize;	/* in 512byte sectors */
 	__u32	raid_disks;
-	__u8	pad1[128-96];	/* set to 0 when written */
+	__u32	bitmap_offset;	/* sectors after start of superblock that bitmap starts
+				 * NOTE: signed, so bitmap can be before superblock
+				 * only meaningful of feature_map[0] is set.
+				 */
+
+	/* These are only valid with feature bit '4' */
+	__u32	new_level;	/* new level we are reshaping to		*/
+	__u64	reshape_position;	/* next address in array-space for reshape */
+	__u32	delta_disks;	/* change in number of raid_disks		*/
+	__u32	new_layout;	/* new layout					*/
+	__u32	new_chunk;	/* new chunk size (bytes)			*/
+	__u8	pad1[128-124];	/* set to 0 when written */
 
 	/* constant this-device information - 64 bytes */
 	__u64	data_offset;	/* sector start of data, often 0 */
@@ -207,7 +242,9 @@ struct mdp_superblock_1 {
 	__u32	dev_number;	/* permanent identifier of this  device - not role in raid */
 	__u32	cnt_corrected_read; /* number of read errors that were corrected by re-writing */
 	__u8	device_uuid[16]; /* user-space setable, ignored by kernel */
-	__u8	pad2[64-56];	/* set to 0 when writing */
+	__u8	devflags;	/* per-device flags.  Only one defined...*/
+#define	WriteMostly1	1	/* mask for writemostly flag in above */
+	__u8	pad2[64-57];	/* set to 0 when writing */
 
 	/* array state information - 64 bytes */
 	__u64	utime;		/* 40 bits second, 24 btes microseconds */
@@ -226,5 +263,11 @@ struct mdp_superblock_1 {
 	__u16	dev_roles[0];	/* role in array, or 0xffff for a spare, or 0xfffe for faulty */
 };
 
+/* feature_map bits */
+#define MD_FEATURE_BITMAP_OFFSET	1
+#define	MD_FEATURE_RESHAPE_ACTIVE	4
+
+#define	MD_FEATURE_ALL			5
+
 #endif