X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Fobdclass%2Fgenops.c;h=b6403f369c8e24038067ffdec3ec047d1ce355f3;hb=51086597ce8a7041222ffeadef52d19a570a7c34;hp=bfc34994cd2f8a317694fc3949de5da67c8e8e9e;hpb=d2af72e46de8b349dc7356e2acdae375b257f6d0;p=fs%2Flustre-release.git

diff --git a/lustre/obdclass/genops.c b/lustre/obdclass/genops.c
index bfc3499..b6403f3 100644
--- a/lustre/obdclass/genops.c
+++ b/lustre/obdclass/genops.c
@@ -1,243 +1,367 @@
 /*
  *  linux/fs/ext2_obd/sim_obd.c
+ * Copyright (C) 2001  Cluster File Systems, Inc.
  *
- * These are the only exported functions; they provide the simulated object-
- * oriented disk.
+ * This code is issued under the GNU General Public License.
+ * See the file COPYING in this distribution
+ *
+ * These are the only exported functions, they provide some generic
+ * infrastructure for managing object devices
  *
  */
 
-#include <asm/uaccess.h>
-#include <linux/sched.h>
-#include <linux/stat.h>
-#include <linux/string.h>
-#include <linux/locks.h>
-#include <linux/quotaops.h>
-#include <linux/list.h>
-#include <linux/file.h>
-#include <linux/iobuf.h>
-#include <asm/bitops.h>
-#include <asm/byteorder.h>
-#include <linux/obd_support.h>
+#define DEBUG_SUBSYSTEM S_CLASS
+#include <linux/kmod.h>   /* for request_module() */
+#include <linux/module.h>
 #include <linux/obd_class.h>
+#include <linux/random.h>
+#include <linux/slab.h>
 
-
+extern struct list_head obd_types; 
 extern struct obd_device obd_dev[MAX_OBD_DEVICES];
+kmem_cache_t *obdo_cachep = NULL;
+kmem_cache_t *export_cachep = NULL;
+kmem_cache_t *import_cachep = NULL;
 
-/* map connection to client */
-struct obd_client *gen_client(struct obd_conn *conn)
+/*
+ * support functions: we could use inter-module communication, but this
+ * is more portable to other OS's
+ */
+static struct obd_type *class_search_type(char *nm)
 {
-	struct obd_device * obddev = conn->oc_dev;
-	struct list_head * lh, * next;
-	struct obd_client * cli;
-
-	lh = next = &obddev->obd_gen_clients;
-	while ((lh = lh->next) != &obddev->obd_gen_clients) {
-		cli = list_entry(lh, struct obd_client, cli_chain);
-		
-		if (cli->cli_id == conn->oc_id)
-			return cli;
-	}
-
-	return NULL;
-} /* obd_client */
+        struct list_head *tmp;
+        struct obd_type *type;
+        CDEBUG(D_INFO, "SEARCH %s\n", nm);
+
+        tmp = &obd_types;
+        while ( (tmp = tmp->next) != &obd_types ) {
+                type = list_entry(tmp, struct obd_type, typ_chain);
+                CDEBUG(D_INFO, "TYP %s\n", type->typ_name);
+                if (strlen(type->typ_name) == strlen(nm) &&
+                    strcmp(type->typ_name, nm) == 0 ) {
+                        return type;
+                }
+        }
+        return NULL;
+}
 
+struct obd_type *class_nm_to_type(char *nm)
+{
+        struct obd_type *type = class_search_type(nm);
+
+#ifdef CONFIG_KMOD
+        if ( !type ) {
+                if ( !request_module(nm) ) {
+                        CDEBUG(D_INFO, "Loaded module '%s'\n", nm);
+                        type = class_search_type(nm);
+                } else {
+                        CDEBUG(D_INFO, "Can't load module '%s'\n", nm);
+                }
+        }
+#endif
+        return type;
+}
 
+int class_register_type(struct obd_ops *ops, char *nm)
+{
+        struct obd_type *type;
+
+        ENTRY;
+
+        if (class_search_type(nm)) {
+                CDEBUG(D_IOCTL, "Type %s already registered\n", nm);
+                RETURN(-EEXIST);
+        }
+
+        OBD_ALLOC(type, sizeof(*type));
+        if (!type)
+                RETURN(-ENOMEM);
+        INIT_LIST_HEAD(&type->typ_chain);
+        MOD_INC_USE_COUNT;
+        list_add(&type->typ_chain, obd_types.next);
+        type->typ_ops = ops;
+        type->typ_name = nm;
+        RETURN(0);
+}
 
-/* a connection defines a context in which preallocation can be managed. */ 
-int gen_connect (struct obd_conn *conn)
+int class_unregister_type(char *nm)
 {
-	struct obd_client * cli;
+        struct obd_type *type = class_nm_to_type(nm);
 
-	OBD_ALLOC(cli, struct obd_client *, sizeof(struct obd_client));
-	if ( !cli ) {
-		printk("obd_connect (minor %d): no memory!\n", 
-		       conn->oc_dev->obd_minor);
-		return -ENOMEM;
-	}
+        ENTRY;
 
-	INIT_LIST_HEAD(&cli->cli_prealloc_inodes);
-	/* this should probably spinlocked? */
-	cli->cli_id = ++conn->oc_dev->obd_gen_last_id;
-	cli->cli_prealloc_quota = 0;
-	cli->cli_obd = conn->oc_dev;
-	list_add(&(cli->cli_chain), conn->oc_dev->obd_gen_clients.prev);
+        if ( !type ) {
+                MOD_DEC_USE_COUNT;
+                CERROR("unknown obd type\n");
+                RETURN(-EINVAL);
+        }
 
-	CDEBUG(D_IOCTL, "connect: new ID %u\n", cli->cli_id);
-	conn->oc_id = cli->cli_id;
-	return 0;
-} /* gen_obd_connect */
+        if ( type->typ_refcnt ) {
+                MOD_DEC_USE_COUNT;
+                CERROR("type %s has refcount (%d)\n", nm, type->typ_refcnt);
+                RETURN(-EBUSY);
+        }
 
+        list_del(&type->typ_chain);
+        OBD_FREE(type, sizeof(*type));
+        MOD_DEC_USE_COUNT;
+        RETURN(0);
+} /* class_unregister_type */
 
-int gen_disconnect(struct obd_conn *conn)
+int class_name2dev(char *name)
 {
-	struct obd_client * cli;
-	ENTRY;
-
-	if (!(cli = gen_client(conn))) {
-		CDEBUG(D_IOCTL, "disconnect: attempting to free "
-		       "nonexistent client %u\n", conn->oc_id);
-		return -EINVAL;
-	}
-
+        int res = -1;
+        int i;
 
-	list_del(&(cli->cli_chain));
-	OBD_FREE(cli, sizeof(struct obd_client));
+	if (!name)
+	    return -1;
 
-	CDEBUG(D_IOCTL, "disconnect: ID %u\n", conn->oc_id);
-
-	EXIT;
-	return 0;
-} /* gen_obd_disconnect */
+        for (i=0; i < MAX_OBD_DEVICES; i++) {
+                struct obd_device *obd = &obd_dev[i];
+                if (obd->obd_name && strcmp(name, obd->obd_name) == 0) {
+                        res = i;
+                        return res;
+                }
+        }
 
+        return res;
+}
 
-/* 
- *   raid1 defines a number of connections to child devices,
- *   used to make calls to these devices.
- *   data holds nothing
- */ 
-int gen_multi_setup(struct obd_device *obddev, int len, void *data)
+int class_uuid2dev(char *name)
 {
-	int i;
-
-	for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
-		int rc;
-		struct obd_conn *ch_conn = &obddev->obd_multi_conn[i];
-		rc  = OBP(ch_conn->oc_dev, connect)(ch_conn);
-
-		if ( rc != 0 ) {
-			/* XXX disconnect others */
-			return -EINVAL;
-		}
-	}		
-	return 0;
+        int res = -1;
+        int i;
+
+        for (i=0; i < MAX_OBD_DEVICES; i++) {
+                struct obd_device *obd = &obd_dev[i];
+                if (obd->obd_name && strncmp(name, obd->obd_uuid, 37) == 0) {
+                        res = i;
+                        return res;
+                }
+        }
+
+        return res;
 }
 
 
-#if 0
-int gen_multi_attach(struct obd_device *obddev, int len, void *data)
+struct obd_device *class_uuid2obd(char *name)
 {
-	int i;
-	int count;
-	struct obd_device *rdev = obddev->obd_multi_dev[0];
-
-	count = len/sizeof(int);
-	obddev->obd_multi_count = count;
-	for (i=0 ; i<count ; i++) {
-		rdev = &obd_dev[*((int *)data + i)];
-		rdev = rdev + 1;
-		CDEBUG(D_IOCTL, "OBD RAID1: replicator %d is of type %s\n", i,
-		       (rdev + i)->obd_type->typ_name);
-	}
-	return 0;
-}
-#endif
+        int i;
 
+        for (i=0; i < MAX_OBD_DEVICES; i++) {
+                struct obd_device *obd = &obd_dev[i];
+                if (obd->obd_name && strncmp(name, obd->obd_uuid, 37) == 0) {
+                        return obd;
+                }
+        }
 
-/*
- *    remove all connections to this device
- *    close all connections to lower devices
- *    needed for forced unloads of OBD client drivers
- */
-int gen_multi_cleanup(struct obd_device *obddev)
+        return NULL;
+}
+
+void obd_cleanup_caches(void)
 {
-	int i;
+        int rc;
+        ENTRY;
+        if (obdo_cachep) { 
+                rc = kmem_cache_destroy(obdo_cachep);
+                if (rc)
+                        CERROR("Cannot destory obdo_cachep\n");
+                obdo_cachep = NULL;
+        }
+        if (import_cachep) { 
+                rc = kmem_cache_destroy(import_cachep);
+                if (rc)
+                        CERROR("Cannot destory import_cachep\n");
+                import_cachep = NULL;
+        }
+        if (export_cachep) { 
+                rc = kmem_cache_destroy(export_cachep);
+                if (rc)
+                        CERROR("Cannot destory import_cachep\n");
+                export_cachep = NULL;
+        }
+        EXIT;
+}
 
-	for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
-		struct obd_conn *ch_conn = &obddev->obd_multi_conn[i];
-		int rc;
-		rc  = OBP(ch_conn->oc_dev, disconnect)(ch_conn);
+int obd_init_caches(void)
+{
+        ENTRY;
+        if (obdo_cachep == NULL) {
+                obdo_cachep = kmem_cache_create("obdo_cache",
+                                                sizeof(struct obdo),
+                                                0, SLAB_HWCACHE_ALIGN,
+                                                NULL, NULL);
+                if (obdo_cachep == NULL)
+                        GOTO(out, -ENOMEM);
+        }
+
+        if (export_cachep == NULL) {
+                export_cachep = kmem_cache_create("export_cache",
+                                                sizeof(struct obd_export),
+                                                0, SLAB_HWCACHE_ALIGN,
+                                                NULL, NULL);
+                if (export_cachep == NULL)
+                        GOTO(out, -ENOMEM);
+        }
+
+        if (import_cachep == NULL) {
+                import_cachep = kmem_cache_create("import_cache",
+                                                sizeof(struct obd_import),
+                                                0, SLAB_HWCACHE_ALIGN,
+                                                NULL, NULL);
+                if (import_cachep == NULL)
+                        GOTO(out, -ENOMEM);
+        }
+        RETURN(0);
+ out:
+        obd_cleanup_caches();
+        RETURN(-ENOMEM);
 
-		if ( rc != 0 ) {
-			printk("OBD multi cleanup dev: disconnect failure %d\n", ch_conn->oc_dev->obd_minor);
-		}
-	}		
-	return 0;
-} /* gen_multi_cleanup_device */
+}
 
+/* map connection to client */
+struct obd_export *class_conn2export(struct lustre_handle *conn)
+{
+        struct obd_export * export;
+
+        if (!conn)
+                RETURN(NULL);
+
+        if (!conn->addr || conn->addr == -1 ) { 
+                fixme();
+                RETURN(NULL);
+        }
+              
+        export = (struct obd_export *) (unsigned long)conn->addr;
+        if (!kmem_cache_validate(export_cachep, (void *)export))
+                RETURN(NULL);
+
+        if (export->export_cookie != conn->cookie)
+                return NULL;
+        return export;
+} /* class_conn2export */
+
+struct obd_device *class_conn2obd(struct lustre_handle *conn)
+{
+        struct obd_export *export;
+        export = class_conn2export(conn); 
+        if (export) 
+                return export->export_obd;
+        fixme();
+        return NULL;
+}
 
-/*
- *    forced cleanup of the device:
- *    - remove connections from the device
- *    - cleanup the device afterwards
- */
-int gen_cleanup(struct obd_device * obddev)
+/* a connection defines an export context in which preallocation can
+   be managed. */
+int class_connect (struct lustre_handle *conn, struct obd_device *obd)
+{
+        struct obd_export * export;
+
+        export = kmem_cache_alloc(export_cachep, GFP_KERNEL); 
+        if ( !export ) {
+                CERROR("no memory! (minor %d)\n", obd->obd_minor);
+                return -ENOMEM;
+        }
+
+        memset(export, 0, sizeof(*export));
+        get_random_bytes(&export->export_cookie, sizeof(__u64));
+        export->export_obd = obd; 
+        export->export_import.addr = conn->addr;
+        export->export_import.cookie = conn->cookie;
+        
+        list_add(&(export->export_chain), export->export_obd->obd_exports.prev);
+        conn->addr = (__u64) (unsigned long)export;
+        conn->cookie = export->export_cookie;
+        return 0;
+} 
+
+int class_disconnect(struct lustre_handle *conn)
 {
-	struct list_head * lh, * tmp;
-	struct obd_client * cli;
+        struct obd_export * export;
+        ENTRY;
 
-	ENTRY;
+        if (!(export = class_conn2export(conn))) {
+                fixme();
+                CDEBUG(D_IOCTL, "disconnect: attempting to free "
+                       "nonexistent client %Lx\n", conn->addr);
+                RETURN(-EINVAL);
+        }
+        list_del(&export->export_chain);
+        kmem_cache_free(export_cachep, export);
 
-	lh = tmp = &obddev->obd_gen_clients;
-	while ((tmp = tmp->next) != lh) {
-		cli = list_entry(tmp, struct obd_client, cli_chain);
-		CDEBUG(D_IOCTL, "Disconnecting obd_connection %d, at %p\n",
-		       cli->cli_id, cli);
-	}
-	return 0;
-} /* sim_cleanup_device */
+        RETURN(0);
+} 
 
-void ___wait_on_page(struct page *page)
-{
-        struct task_struct *tsk = current;
-        DECLARE_WAITQUEUE(wait, tsk);
-
-        add_wait_queue(&page->wait, &wait);
-        do {
-                run_task_queue(&tq_disk);
-                set_task_state(tsk, TASK_UNINTERRUPTIBLE);
-                if (!PageLocked(page))
-                        break;
-                schedule();
-        } while (PageLocked(page));
-        tsk->state = TASK_RUNNING;
-        remove_wait_queue(&page->wait, &wait);
-}
+#if 0
 
-void lck_page(struct page *page)
+/* FIXME: Data is a space- or comma-separated list of device IDs.  This will
+ * have to change. */
+int class_multi_setup(struct obd_device *obddev, uint32_t len, void *data)
 {
-        while (TryLockPage(page))
-                ___wait_on_page(page);
+        int count, rc;
+        char *p;
+        ENTRY;
+
+        for (p = data, count = 0; p < (char *)data + len; count++) {
+                char *end;
+                int tmp = simple_strtoul(p, &end, 0);
+
+                if (p == end) {
+                        CERROR("invalid device ID starting at: %s\n", p);
+                        GOTO(err_disconnect, rc = -EINVAL);
+                }
+                
+                if (tmp < 0 || tmp >= MAX_OBD_DEVICES) { 
+                        CERROR("Trying to sub dev %d  - dev no too large\n", 
+                               tmp);
+                        GOTO(err_disconnect, rc  = -EINVAL); 
+                }
+
+                rc = obd_connect(&obddev->obd_multi_conn[count], &obd_dev[tmp]);
+                if (rc) {
+                        CERROR("cannot connect to device %d: rc = %d\n", tmp,
+                               rc);
+                        GOTO(err_disconnect, rc);
+                }
+
+                CDEBUG(D_INFO, "target OBD %d is of type %s\n", count,
+                       obd_dev[tmp].obd_type->typ_name);
+
+                p = end + 1;
+        }
+
+        obddev->obd_multi_count = count;
+
+        RETURN(0);
+
+ err_disconnect:
+        for (count--; count >= 0; count--)
+                obd_disconnect(&obddev->obd_multi_conn[count]);
+        return rc;
 }
 
-/* XXX this should return errors correctly, so should migrate!!! */
-int gen_copy_data(struct obd_conn *conn, obdattr *tgt, obdattr *src)
+/*
+ *    remove all connections to this device
+ *    close all connections to lower devices
+ *    needed for forced unloads of OBD client drivers
+ */
+int class_multi_cleanup(struct obd_device *obddev)
 {
-	struct page *page;
-	unsigned long index = 0;
-	int rc;
-	ENTRY;
-
-	CDEBUG(D_INODE, "src: ino %ld blocks %ld, size %Ld, dst: ino %ld\n", 
-	       src->i_ino, src->i_blocks, src->i_size, tgt->i_ino);
-	page = alloc_page(GFP_USER);
-	if ( !page ) {
-		EXIT;
-		return -ENOMEM;
-	}
-	
-	lck_page(page);
-	
-	while (index < ((src->i_size + PAGE_SIZE - 1) >> PAGE_SHIFT)) {
-		
-		page->index = index;
-		rc = OBP(conn->oc_dev, brw)(READ, conn, src, page, 0);
-
-		if ( rc != PAGE_SIZE ) 
-			break;
-
-		rc = OBP(conn->oc_dev,brw)(WRITE, conn, tgt, page, 1);
-		if ( rc != PAGE_SIZE)
-			break;
-
-		CDEBUG(D_INODE, "Copied page %d ...\n", index);
-		
-		index ++;
-	}
-	tgt->i_size = src->i_size;
-	tgt->i_blocks = src->i_blocks;
-	UnlockPage(page);
-	__free_page(page);
-
-	EXIT;
-	return 0;
+        int i;
+
+        for (i = 0; i < obddev->obd_multi_count; i++) {
+                int rc;
+                struct obd_device *obd = class_conn2obd(&obddev->obd_multi_conn[i]);
+
+                if (!obd) { 
+                        CERROR("no such device [i %d]\n", i); 
+                        RETURN(-EINVAL);
+                }
+
+                rc = obd_disconnect(&obddev->obd_multi_conn[i]);
+                if (rc)
+                        CERROR("disconnect failure %d\n", obd->obd_minor);
+        }
+        return 0;
 }
+#endif