* 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
*
*/
-#include <linux/mm.h>
-#include <linux/pagemap.h>
-#include <linux/fs.h>
-#include <linux/sched.h>
-#include <asm/uaccess.h>
-
#define DEBUG_SUBSYSTEM S_CLASS
-
-#include <linux/obd_support.h>
+#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;
-int obd_init_obdo_cache(void)
+/*
+ * 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)
{
- 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) {
- EXIT;
- return -ENOMEM;
- } else {
- CDEBUG(D_CACHE, "allocated cache at %p\n", obdo_cachep);
+ 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;
}
- } else {
- CDEBUG(D_CACHE, "using existing cache at %p\n", obdo_cachep);
}
- EXIT;
- return 0;
+ return NULL;
}
-void obd_cleanup_obdo_cache(void)
+struct obd_type *class_nm_to_type(char *nm)
{
- 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;
-}
+ 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;
+}
-/* map connection to client */
-struct obd_client *gen_client(const struct obd_conn *conn)
+int class_register_type(struct obd_ops *ops, char *nm)
{
- struct obd_device * obddev;
- struct list_head * lh, * next;
- struct obd_client * cli;
+ struct obd_type *type;
- if (!conn)
- return NULL;
+ ENTRY;
- 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 (class_search_type(nm)) {
+ CDEBUG(D_IOCTL, "Type %s already registered\n", nm);
+ RETURN(-EEXIST);
}
- return NULL;
-} /* obd_client */
-
+ 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;
-
- OBD_ALLOC(cli, sizeof(*cli));
- if ( !cli ) {
- CERROR("no memory! (minor %d)\n", conn->oc_dev->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;
- return 0;
-} /* gen_obd_connect */
+ struct obd_type *type = class_nm_to_type(nm);
-
-int gen_disconnect(struct obd_conn *conn)
-{
- 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;
+ 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(&(cli->cli_chain));
- OBD_FREE(cli, sizeof(*cli));
-
- CDEBUG(D_INFO, "disconnect: ID %u\n", conn->oc_id);
-
- EXIT;
- return 0;
-} /* gen_obd_disconnect */
-
+ list_del(&type->typ_chain);
+ OBD_FREE(type, sizeof(*type));
+ MOD_DEC_USE_COUNT;
+ RETURN(0);
+} /* class_unregister_type */
-/*
- * 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, uint32_t len, void *data)
+int class_name2dev(char *name)
{
+ int res = -1;
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 ) {
- int j;
+ if (!name)
+ return -1;
- for (j = --i; j >= 0; --j) {
- ch_conn = &obddev->obd_multi_conn[i];
- OBP(ch_conn->oc_dev, disconnect)(ch_conn);
- }
- return -EINVAL;
+ 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 0;
-}
+ }
+ return res;
+}
-#if 0
-int gen_multi_attach(struct obd_device *obddev, int len, void *data)
+int class_uuid2dev(char *name)
{
+ int res = -1;
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_INFO, "OBD RAID1: replicator %d is of type %s\n", i,
- (rdev + i)->obd_type->typ_name);
+ 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 0;
+
+ return res;
}
-#endif
-/*
- * 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)
+struct obd_device *class_uuid2obd(char *name)
{
int i;
- 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);
-
- if ( rc != 0 ) {
- CERROR("disconnect failure %d\n",
- ch_conn->oc_dev->obd_minor);
+ 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 0;
-} /* gen_multi_cleanup_device */
+ }
+ return NULL;
+}
-/*
- * forced cleanup of the device:
- * - remove connections from the device
- * - cleanup the device afterwards
- */
-int gen_cleanup(struct obd_device * obddev)
+void obd_cleanup_caches(void)
{
- struct list_head * lh, * tmp;
- struct obd_client * cli;
+ 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) {
+ obdo_cachep = kmem_cache_create("obdo_cache",
+ sizeof(struct obdo),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL, NULL);
+ if (obdo_cachep == NULL)
+ GOTO(out, -ENOMEM);
+ }
- 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);
+ 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);
}
- return 0;
-} /* sim_cleanup_device */
-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 (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 lck_page(struct page *page)
+/* 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)
{
- while (TryLockPage(page))
- ___wait_on_page(page);
+ struct obd_export *export;
+ export = class_conn2export(conn);
+ if (export)
+ return export->export_obd;
+ fixme();
+ return NULL;
}
-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)
+/* a connection defines an export context in which preallocation can
+ be managed. */
+int class_connect (struct lustre_handle *conn, struct obd_device *obd)
{
- struct page *page;
- unsigned long index = 0;
- int err = 0;
+ struct obd_export * export;
- 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 ) {
- EXIT;
+ 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;
- 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;
+ 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 obd_export * export;
+ 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);
+
+ RETURN(0);
+}
+
+#if 0
+
+/* 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)
+{
+ 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);
+ }
- page->index = index;
- err = OBP(src_conn->oc_dev, brw)(READ, src_conn, num_oa, &src,
- &num_buf, &page, &brw_count,
- &brw_offset, &flagr);
-
- if ( err ) {
- EXIT;
- break;
+ if (tmp < 0 || tmp >= MAX_OBD_DEVICES) {
+ CERROR("Trying to sub dev %d - dev no too large\n",
+ tmp);
+ GOTO(err_disconnect, rc = -EINVAL);
}
- CDEBUG(D_INFO, "Read page %ld ...\n", page->index);
- err = OBP(dst_conn->oc_dev, brw)(WRITE, dst_conn, num_oa, &dst,
- &num_buf, &page, &brw_count,
- &brw_offset, &flagw);
-
- /* XXX should handle dst->o_size, dst->o_blocks here */
- if ( err ) {
- EXIT;
- break;
+ 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, "Wrote page %ld ...\n", page->index);
-
- index++;
+ CDEBUG(D_INFO, "target OBD %d is of type %s\n", count,
+ obd_dev[tmp].obd_type->typ_name);
+
+ p = end + 1;
}
- 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);
- EXIT;
- return err;
+ obddev->obd_multi_count = count;
+
+ RETURN(0);
+
+ err_disconnect:
+ for (count--; count >= 0; count--)
+ obd_disconnect(&obddev->obd_multi_conn[count]);
+ return rc;
+}
+
+/*
+ * 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)
+{
+ 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