patch-2.2.18 linux/include/linux/nfs_flushd.h

• Lines: 65
• Date: Fri Sep 15 22:10:44 2000
• Orig file: v2.2.17/include/linux/nfs_flushd.h
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/include/linux/nfs_flushd.h linux/include/linux/nfs_flushd.h
@@ -0,0 +1,64 @@
+#ifndef NFS_CLUSTER_H
+#define NFS_CLUSTER_H
+
+
+
+#ifdef __KERNEL__
+#include <linux/nfs_fs_sb.h>
+
+/*
+ * Counters of total number and pending number of requests.
+ * When the total number of requests exceeds the soft limit, we start
+ * flushing out requests. If it exceeds the hard limit, we stall until
+ * it drops again.
+ */
+#define MAX_REQUEST_SOFT        192
+#define MAX_REQUEST_HARD        256
+
+/*
+ * Maximum number of requests per write cluster.
+ * 32 requests per cluster account for 128K of data on an intel box.
+ * Note: it's a good idea to make this number smaller than MAX_REQUEST_SOFT.
+ *
+ * For 100Mbps Ethernet, 128 pages (i.e. 256K) per cluster gives much
+ * better performance.
+ */
+#define REQUEST_HASH_SIZE	16
+#define REQUEST_NR(off)		((off) >> PAGE_CACHE_SHIFT)
+#define REQUEST_HASH(ino, off)	(((ino) ^ REQUEST_NR(off)) & (REQUEST_HASH_SIZE - 1))
+
+
+/*
+ * Functions
+ */
+extern int		nfs_reqlist_alloc(struct nfs_server *);
+extern void		nfs_reqlist_free(struct nfs_server *);
+extern int		nfs_reqlist_init(struct nfs_server *);
+extern void		nfs_reqlist_exit(struct nfs_server *);
+extern void		inode_schedule_scan(struct inode *, unsigned long);
+extern void		inode_remove_flushd(struct inode *);
+extern void		nfs_wake_flushd(void);
+
+/*
+ * This is the per-mount writeback cache.
+ */
+struct nfs_reqlist {
+	unsigned int		nr_requests;
+	unsigned long		runat;
+	struct wait_queue	*request_wait;
+
+	/* The async RPC task that is responsible for scanning the
+	 * requests.
+	 */
+	struct rpc_task		*task;		/* request flush task */
+
+	/* Authentication flavor handle for this NFS client */
+	struct rpc_auth		*auth;
+
+	/* The list of all inodes with pending writebacks.  */
+	struct inode		*inodes;
+};
+
+#endif
+
+#endif