/*
* 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: blocks %ld, size %Ld\n",
- src->i_blocks, src->i_size);
- 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 1 page ...\n");
-
- 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
git://git.whamcloud.com / fs / lustre-release.git / blobdiff