patch-2.1.63 linux/include/linux/raid5.h

• Lines: 111
• Date: Sat Nov 8 11:39:13 1997
• Orig file: v2.1.62/linux/include/linux/raid5.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.62/linux/include/linux/raid5.h linux/include/linux/raid5.h
@@ -0,0 +1,110 @@
+#ifndef _RAID5_H
+#define _RAID5_H
+
+#ifdef __KERNEL__
+#include <linux/md.h>
+#include <asm/atomic.h>
+
+struct disk_info {
+	kdev_t	dev;
+	int	operational;
+	int	number;
+	int	raid_disk;
+	int	write_only;
+	int	spare;
+};
+
+struct stripe_head {
+	struct stripe_head	*hash_next, **hash_pprev; /* hash pointers */
+	struct stripe_head	*free_next;		/* pool of free sh's */
+	struct buffer_head	*buffer_pool;		/* pool of free buffers */
+	struct buffer_head	*bh_pool;		/* pool of free bh's */
+	struct raid5_data	*raid_conf;
+	struct buffer_head	*bh_old[MD_SB_DISKS];	/* disk image */
+	struct buffer_head	*bh_new[MD_SB_DISKS];	/* buffers of the MD device (present in buffer cache) */
+	struct buffer_head	*bh_copy[MD_SB_DISKS];	/* copy on write of bh_new (bh_new can change from under us) */
+	struct buffer_head	*bh_req[MD_SB_DISKS];	/* copy of bh_new (only the buffer heads), queued to the lower levels */
+	int			cmd_new[MD_SB_DISKS];	/* READ/WRITE for new */
+	int			new[MD_SB_DISKS];	/* buffer added since the last handle_stripe() */
+	unsigned long		sector;			/* sector of this row */
+	int			size;			/* buffers size */
+	int			pd_idx;			/* parity disk index */
+	int			nr_pending;		/* nr of pending cmds */
+	__u32			state;			/* state flags */
+	int			cmd;			/* stripe cmd */
+	int			count;			/* nr of waiters */
+	int			write_method;		/* reconstruct-write / read-modify-write */
+	int			phase;			/* PHASE_BEGIN, ..., PHASE_COMPLETE */
+	struct wait_queue	*wait;			/* processes waiting for this stripe */
+};
+
+/*
+ * Phase
+ */
+#define PHASE_BEGIN		0
+#define PHASE_READ_OLD		1
+#define PHASE_WRITE		2
+#define PHASE_READ		3
+#define PHASE_COMPLETE		4
+
+/*
+ * Write method
+ */
+#define METHOD_NONE		0
+#define RECONSTRUCT_WRITE	1
+#define READ_MODIFY_WRITE	2
+
+/*
+ * Stripe state
+ */
+#define STRIPE_LOCKED		0
+#define STRIPE_ERROR		1
+
+/*
+ * Stripe commands
+ */
+#define STRIPE_NONE		0
+#define	STRIPE_WRITE		1
+#define STRIPE_READ		2
+
+struct raid5_data {
+	struct stripe_head	**stripe_hashtbl;
+	struct md_dev		*mddev;
+	struct md_thread	*thread, *resync_thread;
+	struct disk_info	disks[MD_SB_DISKS];
+	struct disk_info	*spare;
+	int			buffer_size;
+	int			chunk_size, level, algorithm;
+	int			raid_disks, working_disks, failed_disks;
+	int			sector_count;
+	unsigned long		next_sector;
+	atomic_t		nr_handle;
+	struct stripe_head	*next_free_stripe;
+	int			nr_stripes;
+	int			resync_parity;
+	int			max_nr_stripes;
+	int			clock;
+	int			nr_hashed_stripes;
+	int			nr_locked_stripes;
+	int			nr_pending_stripes;
+	int			nr_cached_stripes;
+
+	/*
+	 * Free stripes pool
+	 */
+	int			nr_free_sh;
+	struct stripe_head	*free_sh_list;
+	struct wait_queue	*wait_for_stripe;
+};
+
+#endif
+
+/*
+ * Our supported algorithms
+ */
+#define ALGORITHM_LEFT_ASYMMETRIC	0
+#define ALGORITHM_RIGHT_ASYMMETRIC	1
+#define ALGORITHM_LEFT_SYMMETRIC	2
+#define ALGORITHM_RIGHT_SYMMETRIC	3
+
+#endif