* 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 the simulated object-
- * oriented disk.
+ * These are the only exported functions, they provide some generic
+ * infrastructure for managing object devices
*
*/
#define DEBUG_SUBSYSTEM S_CLASS
-
+#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;
+/*
+ * 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 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_nm_to_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);
+}
+
+int class_unregister_type(char *nm)
+{
+ struct obd_type *type = class_nm_to_type(nm);
+
+ ENTRY;
+
+ if ( !type ) {
+ MOD_DEC_USE_COUNT;
+ CERROR("unknown obd type\n");
+ RETURN(-EINVAL);
+ }
+
+ 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 class_name2dev(char *name)
+{
+ int res = -1;
+ int i;
+
+ 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;
+}
+
+int class_uuid2dev(char *name)
+{
+ 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;
+}
+
void obd_cleanup_caches(void)
{
int rc;
}
-
/* map connection to client */
-struct obd_export *gen_client(struct obd_conn *conn)
+struct obd_export *class_conn2export(struct lustre_handle *conn)
{
struct obd_export * export;
if (export->export_cookie != conn->cookie)
return NULL;
return export;
-} /* gen_client */
+} /* class_conn2export */
-struct obd_device *gen_conn2obd(struct obd_conn *conn)
+struct obd_device *class_conn2obd(struct lustre_handle *conn)
{
struct obd_export *export;
- export = gen_client(conn);
+ export = class_conn2export(conn);
if (export)
return export->export_obd;
fixme();
return NULL;
}
-/* a connection defines a context in which preallocation can be managed. */
-int gen_connect (struct obd_conn *conn, struct obd_device *obd)
+/* 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;
list_add(&(export->export_chain), export->export_obd->obd_exports.prev);
CDEBUG(D_INFO, "connect: new ID %u\n", export->export_id);
- conn->oc_id = export->export_id;
conn->addr = (__u64) (unsigned long)export;
conn->cookie = export->export_cookie;
return 0;
-} /* gen_connect */
+} /* class_connect */
-
-int gen_disconnect(struct obd_conn *conn)
+int class_disconnect(struct lustre_handle *conn)
{
struct obd_export * export;
ENTRY;
- if (!(export = gen_client(conn))) {
+ if (!(export = class_conn2export(conn))) {
fixme();
CDEBUG(D_IOCTL, "disconnect: attempting to free "
- "nonexistent client %u\n", conn->oc_id);
+ "nonexistent client %Lx\n", conn->addr);
RETURN(-EINVAL);
}
list_del(&export->export_chain);
kmem_cache_free(export_cachep, export);
- CDEBUG(D_INFO, "disconnect: ID %u\n", conn->oc_id);
-
RETURN(0);
} /* gen_obd_disconnect */
/* FIXME: Data is a space- or comma-separated list of device IDs. This will
* have to change. */
-int gen_multi_setup(struct obd_device *obddev, uint32_t len, void *data)
+int class_multi_setup(struct obd_device *obddev, uint32_t len, void *data)
{
int count, rc;
char *p;
if (tmp < 0 || tmp >= MAX_OBD_DEVICES) {
CERROR("Trying to sub dev %d - dev no too large\n",
tmp);
- GOTO(err_disconnect, rc);
+ GOTO(err_disconnect, rc = -EINVAL);
}
rc = obd_connect(&obddev->obd_multi_conn[count], &obd_dev[tmp]);
* close all connections to lower devices
* needed for forced unloads of OBD client drivers
*/
-int gen_multi_cleanup(struct obd_device *obddev)
+int class_multi_cleanup(struct obd_device *obddev)
{
int i;
for (i = 0; i < obddev->obd_multi_count; i++) {
int rc;
- struct obd_device *obd = gen_conn2obd(&obddev->obd_multi_conn[i]);
+ struct obd_device *obd = class_conn2obd(&obddev->obd_multi_conn[i]);
if (!obd) {
CERROR("no such device [i %d]\n", i);
return 0;
}
-
-/*
- * forced cleanup of the device:
- * - remove connections from the device
- * - cleanup the device afterwards
- */
-int gen_cleanup(struct obd_device * obddev)
-{
- struct list_head * lh, * tmp;
- struct obd_export * export;
-
- ENTRY;
-
- lh = tmp = &obddev->obd_exports;
- while ((tmp = tmp->next) != lh) {
- export = list_entry(tmp, struct obd_export, export_chain);
- CDEBUG(D_INFO, "Disconnecting obd_connection %d, at %p\n",
- export->export_id, export);
- }
- return 0;
-} /* sim_cleanup_device */
-
-void lck_page(struct page *page)
-{
- while (TryLockPage(page))
- ___wait_on_page(page);
-}
-
-int gen_copy_data(struct obd_conn *dst_conn, struct obdo *dst,
- struct obd_conn *src_conn, struct obdo *src,
- obd_size count, obd_off offset)
-{
- struct page *page;
- unsigned long index = 0;
- int err = 0;
-
- ENTRY;
- CDEBUG(D_INFO, "src: ino %Ld blocks %Ld, size %Ld, dst: ino %Ld\n",
- (unsigned long long)src->o_id, (unsigned long long)src->o_blocks,
- (unsigned long long)src->o_size, (unsigned long long)dst->o_id);
- page = alloc_page(GFP_USER);
- if (page == NULL)
- RETURN(-ENOMEM);
-
- lck_page(page);
-
- /* XXX with brw vector I/O, we could batch up reads and writes here,
- * all we need to do is allocate multiple pages to handle the I/Os
- * and arrays to handle the request parameters.
- */
- while (index < ((src->o_size + PAGE_SIZE - 1) >> PAGE_SHIFT)) {
- obd_count num_oa = 1;
- obd_count num_buf = 1;
- obd_size brw_count = PAGE_SIZE;
- obd_off brw_offset = (page->index) << PAGE_SHIFT;
- obd_flag flagr = 0;
- obd_flag flagw = OBD_BRW_CREATE;
-
- page->index = index;
- err = obd_brw(OBD_BRW_READ, src_conn, num_oa, &src, &num_buf,
- &page, &brw_count, &brw_offset, &flagr, NULL);
-
- if ( err ) {
- EXIT;
- break;
- }
- CDEBUG(D_INFO, "Read page %ld ...\n", page->index);
-
- err = obd_brw(OBD_BRW_WRITE, dst_conn, num_oa, &dst, &num_buf,
- &page, &brw_count, &brw_offset, &flagw, NULL);
-
- /* XXX should handle dst->o_size, dst->o_blocks here */
- if ( err ) {
- EXIT;
- break;
- }
-
- CDEBUG(D_INFO, "Wrote page %ld ...\n", page->index);
-
- index++;
- }
- dst->o_size = src->o_size;
- dst->o_blocks = src->o_blocks;
- dst->o_valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS);
- UnlockPage(page);
- __free_page(page);
-
- RETURN(err);
-}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff