* 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/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;
+
+/*
+ * 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;
+}
-int obd_init_obdo_cache(void)
+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);
+}
+
+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;
+
+ if (!name)
+ return -1;
+
+ 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;
+}
+
+
+struct obd_device *class_uuid2obd(char *name)
+{
+ 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;
+ }
+ }
+
+ return NULL;
+}
+
+void obd_cleanup_caches(void)
+{
+ 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;
+}
+
+int obd_init_caches(void)
{
ENTRY;
if (obdo_cachep == NULL) {
- CDEBUG(D_CACHE, "allocating obdo_cache\n");
obdo_cachep = kmem_cache_create("obdo_cache",
sizeof(struct obdo),
0, SLAB_HWCACHE_ALIGN,
NULL, NULL);
if (obdo_cachep == NULL)
- RETURN(-ENOMEM);
- else
- CDEBUG(D_CACHE, "allocated cache at %p\n", obdo_cachep);
- } else {
- CDEBUG(D_CACHE, "using existing cache at %p\n", obdo_cachep);
+ 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);
-void obd_cleanup_obdo_cache(void)
-{
- ENTRY;
- if (obdo_cachep != NULL) {
- CDEBUG(D_CACHE, "destroying obdo_cache at %p\n", obdo_cachep);
- if (kmem_cache_destroy(obdo_cachep))
- CERROR("unable to free cache\n");
- } else
- CERROR("called with NULL cache pointer\n");
-
- obdo_cachep = NULL;
- EXIT;
}
-
/* map connection to client */
-struct obd_client *gen_client(const struct obd_conn *conn)
+struct obd_export *class_conn2export(struct lustre_handle *conn)
{
- struct obd_device * obddev;
- struct list_head * lh, * next;
- struct obd_client * cli;
+ struct obd_export * export;
if (!conn)
- return NULL;
+ RETURN(NULL);
- obddev = conn->oc_dev;
- 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;
+ 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);
- return NULL;
-} /* gen_client */
+ 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;
+}
-/* a connection defines a context in which preallocation can be managed. */
-int gen_connect (struct obd_conn *conn)
+/* 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_client * cli;
+ struct obd_export * export;
- OBD_ALLOC(cli, sizeof(*cli));
- if ( !cli ) {
- CERROR("no memory! (minor %d)\n", conn->oc_dev->obd_minor);
+ export = kmem_cache_alloc(export_cachep, GFP_KERNEL);
+ if ( !export ) {
+ CERROR("no memory! (minor %d)\n", obd->obd_minor);
return -ENOMEM;
}
- INIT_LIST_HEAD(&cli->cli_prealloc_inodes);
- /* XXX 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);
-
- CDEBUG(D_INFO, "connect: new ID %u\n", cli->cli_id);
- conn->oc_id = cli->cli_id;
+ 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;
-} /* gen_connect */
-
+}
-int gen_disconnect(struct obd_conn *conn)
+int class_disconnect(struct lustre_handle *conn)
{
- struct obd_client * cli;
+ struct obd_export * export;
ENTRY;
- if (!(cli = 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(&(cli->cli_chain));
- OBD_FREE(cli, sizeof(*cli));
-
- CDEBUG(D_INFO, "disconnect: ID %u\n", conn->oc_id);
+ list_del(&export->export_chain);
+ kmem_cache_free(export_cachep, export);
RETURN(0);
-} /* gen_obd_disconnect */
+}
+
+#if 0
/* 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;
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);
+ }
- obddev->obd_multi_conn[count].oc_dev = &obd_dev[tmp];
- rc = obd_connect(&obddev->obd_multi_conn[count]);
+ rc = obd_connect(&obddev->obd_multi_conn[count], &obd_dev[tmp]);
if (rc) {
CERROR("cannot connect to device %d: rc = %d\n", tmp,
rc);
* 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 = obd_disconnect(&obddev->obd_multi_conn[i]);
- if (rc)
- CERROR("disconnect failure %d\n",
- obddev->obd_multi_conn[i].oc_dev->obd_minor);
- }
- 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_client * cli;
-
- ENTRY;
-
- lh = tmp = &obddev->obd_gen_clients;
- while ((tmp = tmp->next) != lh) {
- cli = list_entry(tmp, struct obd_client, cli_chain);
- CDEBUG(D_INFO, "Disconnecting obd_connection %d, at %p\n",
- cli->cli_id, cli);
- }
- 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);
+ int rc;
+ struct obd_device *obd = class_conn2obd(&obddev->obd_multi_conn[i]);
- /* XXX should handle dst->o_size, dst->o_blocks here */
- if ( err ) {
- EXIT;
- break;
+ if (!obd) {
+ CERROR("no such device [i %d]\n", i);
+ RETURN(-EINVAL);
}
- CDEBUG(D_INFO, "Wrote page %ld ...\n", page->index);
-
- index++;
+ rc = obd_disconnect(&obddev->obd_multi_conn[i]);
+ if (rc)
+ CERROR("disconnect failure %d\n", obd->obd_minor);
}
- 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);
+ return 0;
}
+#endif
git://git.whamcloud.com / fs / lustre-release.git / blobdiff