1 files changed, 256 insertions, 0 deletions
diff --git a/fs/afs/cache.c b/fs/afs/cache.c
new file mode 100644
index 000000000000..de0d7de69edc
--- /dev/null
+++ b/fs/afs/cache.c
@@ -0,0 +1,256 @@
+/* AFS caching stuff
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_cell_cache_match(void *target,
+						const void *entry);
+static void afs_cell_cache_update(void *source, void *entry);
+
+struct cachefs_index_def afs_cache_cell_index_def = {
+	.name			= "cell_ix",
+	.data_size		= sizeof(struct afs_cache_cell),
+	.keys[0]		= { CACHEFS_INDEX_KEYS_ASCIIZ, 64 },
+	.match			= afs_cell_cache_match,
+	.update			= afs_cell_cache_update,
+};
+#endif
+
+/*
+ * match a cell record obtained from the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_cell_cache_match(void *target,
+						const void *entry)
+{
+	const struct afs_cache_cell *ccell = entry;
+	struct afs_cell *cell = target;
+
+	_enter("{%s},{%s}", ccell->name, cell->name);
+
+	if (strncmp(ccell->name, cell->name, sizeof(ccell->name)) == 0) {
+		_leave(" = SUCCESS");
+		return CACHEFS_MATCH_SUCCESS;
+	}
+
+	_leave(" = FAILED");
+	return CACHEFS_MATCH_FAILED;
+}
+#endif
+
+/*
+ * update a cell record in the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static void afs_cell_cache_update(void *source, void *entry)
+{
+	struct afs_cache_cell *ccell = entry;
+	struct afs_cell *cell = source;
+
+	_enter("%p,%p", source, entry);
+
+	strncpy(ccell->name, cell->name, sizeof(ccell->name));
+
+	memcpy(ccell->vl_servers,
+	       cell->vl_addrs,
+	       min(sizeof(ccell->vl_servers), sizeof(cell->vl_addrs)));
+
+}
+#endif
+
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_vlocation_cache_match(void *target,
+						     const void *entry);
+static void afs_vlocation_cache_update(void *source, void *entry);
+
+struct cachefs_index_def afs_vlocation_cache_index_def = {
+	.name		= "vldb",
+	.data_size	= sizeof(struct afs_cache_vlocation),
+	.keys[0]	= { CACHEFS_INDEX_KEYS_ASCIIZ, 64 },
+	.match		= afs_vlocation_cache_match,
+	.update		= afs_vlocation_cache_update,
+};
+#endif
+
+/*
+ * match a VLDB record stored in the cache
+ * - may also load target from entry
+ */
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_vlocation_cache_match(void *target,
+						     const void *entry)
+{
+	const struct afs_cache_vlocation *vldb = entry;
+	struct afs_vlocation *vlocation = target;
+
+	_enter("{%s},{%s}", vlocation->vldb.name, vldb->name);
+
+	if (strncmp(vlocation->vldb.name, vldb->name, sizeof(vldb->name)) == 0
+	    ) {
+		if (!vlocation->valid ||
+		    vlocation->vldb.rtime == vldb->rtime
+		    ) {
+			vlocation->vldb = *vldb;
+			vlocation->valid = 1;
+			_leave(" = SUCCESS [c->m]");
+			return CACHEFS_MATCH_SUCCESS;
+		} else if (memcmp(&vlocation->vldb, vldb, sizeof(*vldb)) != 0) {
+			/* delete if VIDs for this name differ */
+			if (memcmp(&vlocation->vldb.vid,
+				   &vldb->vid,
+				   sizeof(vldb->vid)) != 0) {
+				_leave(" = DELETE");
+				return CACHEFS_MATCH_SUCCESS_DELETE;
+			}
+
+			_leave(" = UPDATE");
+			return CACHEFS_MATCH_SUCCESS_UPDATE;
+		} else {
+			_leave(" = SUCCESS");
+			return CACHEFS_MATCH_SUCCESS;
+		}
+	}
+
+	_leave(" = FAILED");
+	return CACHEFS_MATCH_FAILED;
+}
+#endif
+
+/*
+ * update a VLDB record stored in the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static void afs_vlocation_cache_update(void *source, void *entry)
+{
+	struct afs_cache_vlocation *vldb = entry;
+	struct afs_vlocation *vlocation = source;
+
+	_enter("");
+
+	*vldb = vlocation->vldb;
+}
+#endif
+
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_volume_cache_match(void *target,
+						  const void *entry);
+static void afs_volume_cache_update(void *source, void *entry);
+
+struct cachefs_index_def afs_volume_cache_index_def = {
+	.name		= "volume",
+	.data_size	= sizeof(struct afs_cache_vhash),
+	.keys[0]	= { CACHEFS_INDEX_KEYS_BIN, 1 },
+	.keys[1]	= { CACHEFS_INDEX_KEYS_BIN, 1 },
+	.match		= afs_volume_cache_match,
+	.update		= afs_volume_cache_update,
+};
+#endif
+
+/*
+ * match a volume hash record stored in the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_volume_cache_match(void *target,
+						  const void *entry)
+{
+	const struct afs_cache_vhash *vhash = entry;
+	struct afs_volume *volume = target;
+
+	_enter("{%u},{%u}", volume->type, vhash->vtype);
+
+	if (volume->type == vhash->vtype) {
+		_leave(" = SUCCESS");
+		return CACHEFS_MATCH_SUCCESS;
+	}
+
+	_leave(" = FAILED");
+	return CACHEFS_MATCH_FAILED;
+}
+#endif
+
+/*
+ * update a volume hash record stored in the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static void afs_volume_cache_update(void *source, void *entry)
+{
+	struct afs_cache_vhash *vhash = entry;
+	struct afs_volume *volume = source;
+
+	_enter("");
+
+	vhash->vtype = volume->type;
+}
+#endif
+
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_vnode_cache_match(void *target,
+						 const void *entry);
+static void afs_vnode_cache_update(void *source, void *entry);
+
+struct cachefs_index_def afs_vnode_cache_index_def = {
+	.name		= "vnode",
+	.data_size	= sizeof(struct afs_cache_vnode),
+	.keys[0]	= { CACHEFS_INDEX_KEYS_BIN, 4 },
+	.match		= afs_vnode_cache_match,
+	.update		= afs_vnode_cache_update,
+};
+#endif
+
+/*
+ * match a vnode record stored in the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static cachefs_match_val_t afs_vnode_cache_match(void *target,
+						 const void *entry)
+{
+	const struct afs_cache_vnode *cvnode = entry;
+	struct afs_vnode *vnode = target;
+
+	_enter("{%x,%x,%Lx},{%x,%x,%Lx}",
+	       vnode->fid.vnode,
+	       vnode->fid.unique,
+	       vnode->status.version,
+	       cvnode->vnode_id,
+	       cvnode->vnode_unique,
+	       cvnode->data_version);
+
+	if (vnode->fid.vnode != cvnode->vnode_id) {
+		_leave(" = FAILED");
+		return CACHEFS_MATCH_FAILED;
+	}
+
+	if (vnode->fid.unique != cvnode->vnode_unique ||
+	    vnode->status.version != cvnode->data_version) {
+		_leave(" = DELETE");
+		return CACHEFS_MATCH_SUCCESS_DELETE;
+	}
+
+	_leave(" = SUCCESS");
+	return CACHEFS_MATCH_SUCCESS;
+}
+#endif
+
+/*
+ * update a vnode record stored in the cache
+ */
+#ifdef AFS_CACHING_SUPPORT
+static void afs_vnode_cache_update(void *source, void *entry)
+{
+	struct afs_cache_vnode *cvnode = entry;
+	struct afs_vnode *vnode = source;
+
+	_enter("");
+
+	cvnode->vnode_id	= vnode->fid.vnode;
+	cvnode->vnode_unique	= vnode->fid.unique;
+	cvnode->data_version	= vnode->status.version;
+}
+#endif