-/*
- * linux/fs/ext2_obd/sim_obd.c
- * Copyright (C) 2001 Cluster File Systems, Inc.
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ *
+ * Copyright (c) 2001-2003 Cluster File Systems, Inc.
+ *
+ * This file is part of Lustre, http://www.lustre.org.
+ *
+ * Lustre is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
*
- * This code is issued under the GNU General Public License.
- * See the file COPYING in this distribution
+ * Lustre is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
*
- * These are the only exported functions; they provide the simulated object-
- * oriented disk.
+ * You should have received a copy of the GNU General Public License
+ * along with Lustre; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
+ * 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>
+#ifdef __KERNEL__
+#include <linux/kmod.h> /* for request_module() */
+#include <linux/module.h>
#include <linux/obd_class.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+#else
+#include <liblustre.h>
+#include <linux/obd_class.h>
+#include <linux/obd.h>
+#endif
+#include <linux/lprocfs_status.h>
-extern struct obd_device obd_dev[MAX_OBD_DEVICES];
+extern struct list_head obd_types;
+static spinlock_t obd_types_lock = SPIN_LOCK_UNLOCKED;
kmem_cache_t *obdo_cachep = NULL;
+kmem_cache_t *import_cachep = NULL;
-int obd_init_obdo_cache(void)
+int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c);
+void (*ptlrpc_abort_inflight_superhack)(struct obd_import *imp);
+
+/*
+ * 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 *name)
{
- 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;
+
+ spin_lock(&obd_types_lock);
+ list_for_each(tmp, &obd_types) {
+ type = list_entry(tmp, struct obd_type, typ_chain);
+ if (strlen(type->typ_name) == strlen(name) &&
+ strcmp(type->typ_name, name) == 0) {
+ spin_unlock(&obd_types_lock);
+ return type;
}
- } else {
- CDEBUG(D_CACHE, "using existing cache at %p\n", obdo_cachep);
}
- EXIT;
- return 0;
+ spin_unlock(&obd_types_lock);
+ return NULL;
}
-void obd_cleanup_obdo_cache(void)
+struct obd_type *class_get_type(char *name)
{
- ENTRY;
- if (obdo_cachep != NULL) {
- CDEBUG(D_CACHE, "destroying obdo_cache at %p\n", obdo_cachep);
- if (kmem_cache_destroy(obdo_cachep))
- printk(KERN_WARNING __FUNCTION__
- ": unable to free cache\n");
- } else
- printk(KERN_INFO __FUNCTION__
- ": called with NULL cache pointer\n");
-
- obdo_cachep = NULL;
- EXIT;
+ struct obd_type *type = class_search_type(name);
+
+#ifdef CONFIG_KMOD
+ if (!type) {
+ if (!request_module(name)) {
+ CDEBUG(D_INFO, "Loaded module '%s'\n", name);
+ type = class_search_type(name);
+ } else
+ CDEBUG(D_INFO, "Can't load module '%s'\n", name);
+ }
+#endif
+ if (type)
+ try_module_get(type->typ_ops->o_owner);
+ return type;
}
+void class_put_type(struct obd_type *type)
+{
+ LASSERT(type);
+ module_put(type->typ_ops->o_owner);
+}
-/* map connection to client */
-struct obd_client *gen_client(const struct obd_conn *conn)
+int class_register_type(struct obd_ops *ops, struct md_ops *md_ops,
+ struct lprocfs_vars *vars, char *name)
{
- struct obd_device * obddev = conn->oc_dev;
- struct list_head * lh, * next;
- struct obd_client * cli;
+ struct obd_type *type;
+ int rc = 0;
+ ENTRY;
- 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;
+ LASSERT(strnlen(name, 1024) < 1024); /* sanity check */
+
+ if (class_search_type(name)) {
+ CDEBUG(D_IOCTL, "Type %s already registered\n", name);
+ RETURN(-EEXIST);
}
- return NULL;
-} /* obd_client */
+ rc = -ENOMEM;
+ OBD_ALLOC(type, sizeof(*type));
+ if (type == NULL)
+ RETURN(rc);
+
+ OBD_ALLOC(type->typ_ops, sizeof(*type->typ_ops));
+ OBD_ALLOC(type->typ_name, strlen(name) + 1);
+ if (md_ops)
+ OBD_ALLOC(type->typ_md_ops, sizeof(*type->typ_md_ops));
+ if (type->typ_ops == NULL || type->typ_name == NULL ||
+ (md_ops && type->typ_md_ops == NULL))
+ GOTO (failed, rc);
+
+ *(type->typ_ops) = *ops;
+ if (md_ops)
+ *(type->typ_md_ops) = *md_ops;
+ else
+ type->typ_md_ops = NULL;
+ strcpy(type->typ_name, name);
+
+#ifdef LPROCFS
+ type->typ_procroot = lprocfs_register(type->typ_name, proc_lustre_root,
+ vars, type);
+#endif
+ if (IS_ERR(type->typ_procroot)) {
+ rc = PTR_ERR(type->typ_procroot);
+ type->typ_procroot = NULL;
+ GOTO (failed, rc);
+ }
+ spin_lock(&obd_types_lock);
+ list_add(&type->typ_chain, &obd_types);
+ spin_unlock(&obd_types_lock);
+
+ RETURN (0);
+
+ failed:
+ if (type->typ_name != NULL)
+ OBD_FREE(type->typ_name, strlen(name) + 1);
+ if (type->typ_ops != NULL)
+ OBD_FREE (type->typ_ops, sizeof (*type->typ_ops));
+ if (type->typ_md_ops != NULL)
+ OBD_FREE (type->typ_md_ops, sizeof (*type->typ_md_ops));
+ OBD_FREE(type, sizeof(*type));
+ RETURN(rc);
+}
-/* a connection defines a context in which preallocation can be managed. */
-int gen_connect (struct obd_conn *conn)
+int class_unregister_type(char *name)
{
- struct obd_client * cli;
+ struct obd_type *type = class_search_type(name);
+ ENTRY;
- OBD_ALLOC(cli, sizeof(struct obd_client));
- if ( !cli ) {
- printk(__FUNCTION__ ": no memory! (minor %d)\n",
- conn->oc_dev->obd_minor);
- return -ENOMEM;
+ if (!type) {
+ CERROR("unknown obd type\n");
+ RETURN(-EINVAL);
}
- 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 */
+ if (type->typ_refcnt) {
+ CERROR("type %s has refcount (%d)\n", name, type->typ_refcnt);
+ /* This is a bad situation, let's make the best of it */
+ /* Remove ops, but leave the name for debugging */
+ OBD_FREE(type->typ_ops, sizeof(*type->typ_ops));
+ RETURN(-EBUSY);
+ }
+ if (type->typ_procroot) {
+ lprocfs_remove(type->typ_procroot);
+ type->typ_procroot = NULL;
+ }
-int gen_disconnect(struct obd_conn *conn)
+ spin_lock(&obd_types_lock);
+ list_del(&type->typ_chain);
+ spin_unlock(&obd_types_lock);
+ OBD_FREE(type->typ_name, strlen(name) + 1);
+ if (type->typ_ops != NULL)
+ OBD_FREE(type->typ_ops, sizeof(*type->typ_ops));
+ if (type->typ_md_ops != NULL)
+ OBD_FREE (type->typ_md_ops, sizeof (*type->typ_md_ops));
+ OBD_FREE(type, sizeof(*type));
+ RETURN(0);
+} /* class_unregister_type */
+
+struct obd_device *class_newdev(int *dev)
{
- struct obd_client * cli;
- ENTRY;
+ struct obd_device *result = NULL;
+ int i;
- if (!(cli = gen_client(conn))) {
- CDEBUG(D_IOCTL, "disconnect: attempting to free "
- "nonexistent client %u\n", conn->oc_id);
- return -EINVAL;
+ for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
+ struct obd_device *obd = &obd_dev[i];
+ if (!obd->obd_type) {
+ result = obd;
+ if (dev)
+ *dev = i;
+ break;
+ }
}
+ return result;
+}
+int class_name2dev(char *name)
+{
+ int i;
- list_del(&(cli->cli_chain));
- OBD_FREE(cli, sizeof(struct obd_client));
+ if (!name)
+ return -1;
- CDEBUG(D_INFO, "disconnect: ID %u\n", conn->oc_id);
+ 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)
+ return i;
+ }
- EXIT;
- return 0;
-} /* gen_obd_disconnect */
+ return -1;
+}
+struct obd_device *class_name2obd(char *name)
+{
+ int dev = class_name2dev(name);
+ if (dev < 0)
+ return NULL;
+ return &obd_dev[dev];
+}
-/*
- * 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_uuid2dev(struct obd_uuid *uuid)
{
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);
+ for (i = 0; i < MAX_OBD_DEVICES; i++) {
+ struct obd_device *obd = &obd_dev[i];
+ if (obd_uuid_equals(uuid, &obd->obd_uuid))
+ return i;
+ }
+
+ return -1;
+}
+
+struct obd_device *class_uuid2obd(struct obd_uuid *uuid)
+{
+ int dev = class_uuid2dev(uuid);
+ if (dev < 0)
+ return NULL;
+ return &obd_dev[dev];
+}
- if ( rc != 0 ) {
- int j;
+/* Search for a client OBD connected to tgt_uuid. If grp_uuid is
+ specified, then only the client with that uuid is returned,
+ otherwise any client connected to the tgt is returned.
+ If tgt_uuid is NULL, the lov with grp_uuid is returned. */
+struct obd_device * class_find_client_obd(struct obd_uuid *tgt_uuid,
+ char * typ_name,
+ struct obd_uuid *grp_uuid)
+{
+ int i;
- for (j = --i; j >= 0; --j) {
- ch_conn = &obddev->obd_multi_conn[i];
- OBP(ch_conn->oc_dev, disconnect)(ch_conn);
+ for (i = 0; i < MAX_OBD_DEVICES; i++) {
+ struct obd_device *obd = &obd_dev[i];
+ if (obd->obd_type == NULL)
+ continue;
+ if ((strncmp(obd->obd_type->typ_name, typ_name,
+ strlen(typ_name)) == 0)) {
+ struct client_obd *cli = &obd->u.cli;
+ struct obd_import *imp = cli->cl_import;
+ if (tgt_uuid == NULL) {
+ LASSERT(grp_uuid);
+ if (obd_uuid_equals(grp_uuid, &obd->obd_uuid))
+ return obd;
+ continue;
+ }
+ if (obd_uuid_equals(tgt_uuid, &imp->imp_target_uuid) &&
+ ((grp_uuid)? obd_uuid_equals(grp_uuid,
+ &obd->obd_uuid) : 1)) {
+ return obd;
}
- return -EINVAL;
}
- }
- return 0;
-}
+ }
+ return NULL;
+}
-#if 0
-int gen_multi_attach(struct obd_device *obddev, int len, void *data)
+/* Iterate the obd_device list looking devices have grp_uuid. Start
+ searching at *next, and if a device is found, the next index to look
+ it is saved in *next. If next is NULL, then the first matching device
+ will always be returned. */
+struct obd_device * class_devices_in_group(struct obd_uuid *grp_uuid, int *next)
{
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);
+ if (next == NULL)
+ i = 0;
+ else if (*next >= 0 && *next < MAX_OBD_DEVICES)
+ i = *next;
+ else
+ return NULL;
+
+ for (; i < MAX_OBD_DEVICES; i++) {
+ struct obd_device *obd = &obd_dev[i];
+ if (obd->obd_type == NULL)
+ continue;
+ if (obd_uuid_equals(grp_uuid, &obd->obd_uuid)) {
+ if (next != NULL)
+ *next = i+1;
+ return obd;
+ }
}
- return 0;
+
+ return NULL;
}
-#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)
+void obd_cleanup_caches(void)
{
- int i;
+ int rc;
+ ENTRY;
+ if (obdo_cachep) {
+ rc = kmem_cache_destroy(obdo_cachep);
+ if (rc)
+ CERROR("Cannot destory ll_obdo_cache\n");
+ obdo_cachep = NULL;
+ }
+ if (import_cachep) {
+ rc = kmem_cache_destroy(import_cachep);
+ if (rc)
+ CERROR("Cannot destory ll_import_cache\n");
+ import_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;
+ LASSERT(obdo_cachep == NULL);
+ obdo_cachep = kmem_cache_create("ll_obdo_cache", sizeof(struct obdo),
+ 0, 0, NULL, NULL);
+ if (!obdo_cachep)
+ GOTO(out, -ENOMEM);
+
+ LASSERT(import_cachep == NULL);
+ import_cachep = kmem_cache_create("ll_import_cache",
+ sizeof(struct obd_import),
+ 0, 0, NULL, NULL);
+ if (!import_cachep)
+ GOTO(out, -ENOMEM);
+
+ RETURN(0);
+ out:
+ obd_cleanup_caches();
+ RETURN(-ENOMEM);
- if ( rc != 0 ) {
- printk(KERN_WARNING __FUNCTION__
- ": 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;
+ ENTRY;
-/*
- * forced cleanup of the device:
- * - remove connections from the device
- * - cleanup the device afterwards
- */
-int gen_cleanup(struct obd_device * obddev)
+ if (!conn) {
+ CDEBUG(D_CACHE, "looking for null handle\n");
+ RETURN(NULL);
+ }
+
+ if (conn->cookie == -1) { /* this means assign a new connection */
+ CDEBUG(D_CACHE, "want a new connection\n");
+ RETURN(NULL);
+ }
+
+ CDEBUG(D_IOCTL, "looking for export cookie "LPX64"\n", conn->cookie);
+ export = class_handle2object(conn->cookie);
+ RETURN(export);
+}
+
+struct obd_device *class_exp2obd(struct obd_export *exp)
{
- struct list_head * lh, * tmp;
- struct obd_client * cli;
+ if (exp)
+ return exp->exp_obd;
+ return NULL;
+}
- ENTRY;
+struct obd_device *class_conn2obd(struct lustre_handle *conn)
+{
+ struct obd_export *export;
+ export = class_conn2export(conn);
+ if (export) {
+ struct obd_device *obd = export->exp_obd;
+ class_export_put(export);
+ return obd;
+ }
+ return NULL;
+}
+
+struct obd_import *class_exp2cliimp(struct obd_export *exp)
+{
+ struct obd_device *obd = exp->exp_obd;
+ if (obd == NULL)
+ return NULL;
+ return obd->u.cli.cl_import;
+}
+
+struct obd_import *class_conn2cliimp(struct lustre_handle *conn)
+{
+ struct obd_device *obd = class_conn2obd(conn);
+ if (obd == NULL)
+ return NULL;
+ return obd->u.cli.cl_import;
+}
- 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);
+/* Export management functions */
+static void export_handle_addref(void *export)
+{
+ class_export_get(export);
+}
+
+void __class_export_put(struct obd_export *exp)
+{
+ if (atomic_dec_and_test(&exp->exp_refcount)) {
+ struct obd_device *obd = exp->exp_obd;
+ CDEBUG(D_IOCTL, "destroying export %p/%s\n", exp,
+ exp->exp_client_uuid.uuid);
+
+ LASSERT(obd != NULL);
+
+ /* "Local" exports (lctl, LOV->{mdc,osc}) have no connection. */
+ if (exp->exp_connection)
+ ptlrpc_put_connection_superhack(exp->exp_connection);
+
+ LASSERT(list_empty(&exp->exp_outstanding_replies));
+ LASSERT(list_empty(&exp->exp_handle.h_link));
+ obd_destroy_export(exp);
+
+ OBD_FREE(exp, sizeof(*exp));
+ if (obd->obd_set_up) {
+ atomic_dec(&obd->obd_refcount);
+ wake_up(&obd->obd_refcount_waitq);
+ } else {
+ CERROR("removing export %p from obd %s (%p) -- OBD "
+ "not set up (refcount = %d)\n", exp,
+ obd->obd_name, obd,
+ atomic_read(&obd->obd_refcount));
+ }
}
- return 0;
-} /* sim_cleanup_device */
+}
-void ___wait_on_page(struct page *page)
+/* Creates a new export, adds it to the hash table, and returns a
+ * pointer to it. The refcount is 2: one for the hash reference, and
+ * one for the pointer returned by this function. */
+struct obd_export *class_new_export(struct obd_device *obd)
{
- struct task_struct *tsk = current;
- DECLARE_WAITQUEUE(wait, tsk);
+ struct obd_export *export;
- 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);
+ OBD_ALLOC(export, sizeof(*export));
+ if (!export) {
+ CERROR("no memory! (minor %d)\n", obd->obd_minor);
+ return NULL;
+ }
+
+ export->exp_conn_cnt = 0;
+ atomic_set(&export->exp_refcount, 2);
+ atomic_set(&export->exp_rpc_count, 0);
+ export->exp_obd = obd;
+ INIT_LIST_HEAD(&export->exp_outstanding_replies);
+ /* XXX this should be in LDLM init */
+ INIT_LIST_HEAD(&export->exp_ldlm_data.led_held_locks);
+
+ INIT_LIST_HEAD(&export->exp_handle.h_link);
+ class_handle_hash(&export->exp_handle, export_handle_addref);
+ spin_lock_init(&export->exp_lock);
+
+ spin_lock(&obd->obd_dev_lock);
+ LASSERT(!obd->obd_stopping); /* shouldn't happen, but might race */
+ atomic_inc(&obd->obd_refcount);
+ list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports);
+ export->exp_obd->obd_num_exports++;
+ spin_unlock(&obd->obd_dev_lock);
+ obd_init_export(export);
+ return export;
}
-void lck_page(struct page *page)
+void class_unlink_export(struct obd_export *exp)
{
- while (TryLockPage(page))
- ___wait_on_page(page);
+ class_handle_unhash(&exp->exp_handle);
+
+ spin_lock(&exp->exp_obd->obd_dev_lock);
+ list_del_init(&exp->exp_obd_chain);
+ exp->exp_obd->obd_num_exports--;
+ spin_unlock(&exp->exp_obd->obd_dev_lock);
+
+ class_export_put(exp);
}
-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)
+/* Import management functions */
+static void import_handle_addref(void *import)
{
- struct page *page;
- unsigned long index = 0;
- int err = 0;
+ class_import_get(import);
+}
+struct obd_import *class_import_get(struct obd_import *import)
+{
+ atomic_inc(&import->imp_refcount);
+ CDEBUG(D_IOCTL, "import %p refcount=%d\n", import,
+ atomic_read(&import->imp_refcount));
+ return import;
+}
+
+void class_import_put(struct obd_import *import)
+{
ENTRY;
- CDEBUG(D_INFO, "src: ino %Ld blocks %Ld, size %Ld, dst: ino %Ld\n",
- src->o_id, src->o_blocks, src->o_size, dst->o_id);
- page = alloc_page(GFP_USER);
- if ( !page ) {
+
+ CDEBUG(D_IOCTL, "import %p refcount=%d\n", import,
+ atomic_read(&import->imp_refcount) - 1);
+
+ LASSERT(atomic_read(&import->imp_refcount) > 0);
+ LASSERT(atomic_read(&import->imp_refcount) < 0x5a5a5a);
+ if (!atomic_dec_and_test(&import->imp_refcount)) {
EXIT;
- return -ENOMEM;
+ return;
}
-
- 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 = OBP(src_conn->oc_dev, brw)(READ, src_conn, num_oa, &src,
- &num_buf, &page, &brw_count,
- &brw_offset, &flagr);
- if ( err ) {
- EXIT;
- break;
- }
- CDEBUG(D_INFO, "Read page %ld ...\n", page->index);
+ CDEBUG(D_IOCTL, "destroying import %p\n", import);
- err = OBP(dst_conn->oc_dev, brw)(WRITE, dst_conn, num_oa, &dst,
- &num_buf, &page, &brw_count,
- &brw_offset, &flagw);
+ ptlrpc_put_connection_superhack(import->imp_connection);
- /* XXX should handle dst->o_size, dst->o_blocks here */
- if ( err ) {
- EXIT;
- break;
- }
+ LASSERT(list_empty(&import->imp_handle.h_link));
+ OBD_FREE(import, sizeof(*import));
+ EXIT;
+}
- CDEBUG(D_INFO, "Wrote page %ld ...\n", page->index);
-
- index++;
+struct obd_import *class_new_import(void)
+{
+ struct obd_import *imp;
+
+ OBD_ALLOC(imp, sizeof(*imp));
+ if (imp == NULL)
+ return NULL;
+
+ INIT_LIST_HEAD(&imp->imp_replay_list);
+ INIT_LIST_HEAD(&imp->imp_sending_list);
+ INIT_LIST_HEAD(&imp->imp_delayed_list);
+ spin_lock_init(&imp->imp_lock);
+ imp->imp_conn_cnt = 0;
+ imp->imp_max_transno = 0;
+ imp->imp_peer_committed_transno = 0;
+ imp->imp_state = LUSTRE_IMP_NEW;
+ init_waitqueue_head(&imp->imp_recovery_waitq);
+
+ atomic_set(&imp->imp_refcount, 2);
+ atomic_set(&imp->imp_inflight, 0);
+ atomic_set(&imp->imp_replay_inflight, 0);
+ INIT_LIST_HEAD(&imp->imp_handle.h_link);
+ class_handle_hash(&imp->imp_handle, import_handle_addref);
+
+ return imp;
+}
+
+void class_destroy_import(struct obd_import *import)
+{
+ LASSERT(import != NULL);
+ LASSERT(import != LP_POISON);
+
+ class_handle_unhash(&import->imp_handle);
+
+ /* Abort any inflight DLM requests and NULL out their (about to be
+ * freed) import. */
+ /* Invalidate all requests on import, would be better to call
+ ptlrpc_set_import_active(imp, 0); */
+ import->imp_generation++;
+ ptlrpc_abort_inflight_superhack(import);
+
+ class_import_put(import);
+}
+
+/* A connection defines an export context in which preallocation can
+ be managed. This releases the export pointer reference, and returns
+ the export handle, so the export refcount is 1 when this function
+ returns. */
+int class_connect(struct lustre_handle *conn, struct obd_device *obd,
+ struct obd_uuid *cluuid)
+{
+ struct obd_export *export;
+ LASSERT(conn != NULL);
+ LASSERT(obd != NULL);
+ LASSERT(cluuid != NULL);
+ ENTRY;
+
+ export = class_new_export(obd);
+ if (export == NULL)
+ RETURN(-ENOMEM);
+
+ conn->cookie = export->exp_handle.h_cookie;
+ memcpy(&export->exp_client_uuid, cluuid,
+ sizeof(export->exp_client_uuid));
+ class_export_put(export);
+
+ CDEBUG(D_IOCTL, "connect: client %s, cookie "LPX64"\n",
+ cluuid->uuid, conn->cookie);
+ RETURN(0);
+}
+
+/* This function removes two references from the export: one for the
+ * hash entry and one for the export pointer passed in. The export
+ * pointer passed to this function is destroyed should not be used
+ * again. */
+int class_disconnect(struct obd_export *export, int flags)
+{
+ ENTRY;
+
+ if (export == NULL) {
+ fixme();
+ CDEBUG(D_IOCTL, "attempting to free NULL export %p\n", export);
+ RETURN(-EINVAL);
}
- dst->o_size = src->o_size;
- dst->o_blocks = src->o_blocks;
- dst->o_valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS);
- obd_unlock_page(page);
- __free_page(page);
+ /* XXX this shouldn't have to be here, but double-disconnect will crash
+ * otherwise, and sometimes double-disconnect happens. abort_recovery,
+ * for example. */
+ if (list_empty(&export->exp_handle.h_link))
+ RETURN(0);
+
+ CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n",
+ export->exp_handle.h_cookie);
+
+ if (export->exp_handle.h_cookie == 0x5a5a5a5a5a5a5a5a) {
+ CERROR("disconnecting freed export %p, ignoring\n", export);
+ } else {
+ class_unlink_export(export);
+ class_export_put(export);
+ }
+ RETURN(0);
+}
+
+void class_disconnect_exports(struct obd_device *obd, int flags)
+{
+ int rc;
+ struct list_head *tmp, *n, work_list;
+ struct lustre_handle fake_conn;
+ struct obd_export *fake_exp, *exp;
+ ENTRY;
+
+ /* Move all of the exports from obd_exports to a work list, en masse. */
+ spin_lock(&obd->obd_dev_lock);
+ list_add(&work_list, &obd->obd_exports);
+ list_del_init(&obd->obd_exports);
+ spin_unlock(&obd->obd_dev_lock);
+
+ CDEBUG(D_HA, "OBD device %d (%p) has exports, "
+ "disconnecting them\n", obd->obd_minor, obd);
+ list_for_each_safe(tmp, n, &work_list) {
+ exp = list_entry(tmp, struct obd_export, exp_obd_chain);
+ class_export_get(exp);
+
+ if (obd_uuid_equals(&exp->exp_client_uuid,
+ &exp->exp_obd->obd_uuid)) {
+ CDEBUG(D_HA,
+ "exp %p export uuid == obd uuid, don't discon\n",
+ exp);
+ /* Need to delete this now so we don't end up pointing
+ * to work_list later when this export is cleaned up. */
+ list_del_init(&exp->exp_obd_chain);
+ class_export_put(exp);
+ continue;
+ }
+
+ fake_conn.cookie = exp->exp_handle.h_cookie;
+ fake_exp = class_conn2export(&fake_conn);
+ if (!fake_exp) {
+ class_export_put(exp);
+ continue;
+ }
+ rc = obd_disconnect(fake_exp, flags);
+ class_export_put(exp);
+ if (rc) {
+ CDEBUG(D_HA, "disconnecting export %p failed: %d\n",
+ exp, rc);
+ } else {
+ CDEBUG(D_HA, "export %p disconnected\n", exp);
+ }
+ }
EXIT;
- return err;
+}
+
+int oig_init(struct obd_io_group **oig_out)
+{
+ struct obd_io_group *oig;
+ ENTRY;
+
+ OBD_ALLOC(oig, sizeof(*oig));
+ if (oig == NULL)
+ RETURN(-ENOMEM);
+
+ spin_lock_init(&oig->oig_lock);
+ oig->oig_rc = 0;
+ oig->oig_pending = 0;
+ atomic_set(&oig->oig_refcount, 1);
+ init_waitqueue_head(&oig->oig_waitq);
+ INIT_LIST_HEAD(&oig->oig_occ_list);
+
+ *oig_out = oig;
+ RETURN(0);
+};
+
+static inline void oig_grab(struct obd_io_group *oig)
+{
+ atomic_inc(&oig->oig_refcount);
+}
+void oig_release(struct obd_io_group *oig)
+{
+ if (atomic_dec_and_test(&oig->oig_refcount))
+ OBD_FREE(oig, sizeof(*oig));
+}
+
+void oig_add_one(struct obd_io_group *oig,
+ struct oig_callback_context *occ)
+{
+ unsigned long flags;
+ CDEBUG(D_CACHE, "oig %p ready to roll\n", oig);
+ spin_lock_irqsave(&oig->oig_lock, flags);
+ oig->oig_pending++;
+ if (occ != NULL)
+ list_add_tail(&occ->occ_oig_item, &oig->oig_occ_list);
+ spin_unlock_irqrestore(&oig->oig_lock, flags);
+ oig_grab(oig);
+}
+
+void oig_complete_one(struct obd_io_group *oig,
+ struct oig_callback_context *occ, int rc)
+{
+ unsigned long flags;
+ wait_queue_head_t *wake = NULL;
+ int old_rc;
+
+ spin_lock_irqsave(&oig->oig_lock, flags);
+
+ if (occ != NULL)
+ list_del_init(&occ->occ_oig_item);
+
+ old_rc = oig->oig_rc;
+ if (oig->oig_rc == 0 && rc != 0)
+ oig->oig_rc = rc;
+
+ if (--oig->oig_pending <= 0)
+ wake = &oig->oig_waitq;
+
+ spin_unlock_irqrestore(&oig->oig_lock, flags);
+
+ CDEBUG(D_CACHE, "oig %p completed, rc %d -> %d via %d, %d now "
+ "pending (racey)\n", oig, old_rc, oig->oig_rc, rc,
+ oig->oig_pending);
+ if (wake)
+ wake_up(wake);
+ oig_release(oig);
+}
+
+static int oig_done(struct obd_io_group *oig)
+{
+ unsigned long flags;
+ int rc = 0;
+ spin_lock_irqsave(&oig->oig_lock, flags);
+ if (oig->oig_pending <= 0)
+ rc = 1;
+ spin_unlock_irqrestore(&oig->oig_lock, flags);
+ return rc;
+}
+
+static void interrupted_oig(void *data)
+{
+ struct obd_io_group *oig = data;
+ struct list_head *pos;
+ struct oig_callback_context *occ;
+ unsigned long flags;
+
+ spin_lock_irqsave(&oig->oig_lock, flags);
+ list_for_each(pos, &oig->oig_occ_list) {
+ occ = list_entry(pos, struct oig_callback_context,
+ occ_oig_item);
+ occ->occ_interrupted(occ);
+ }
+ spin_unlock_irqrestore(&oig->oig_lock, flags);
+}
+
+int oig_wait(struct obd_io_group *oig)
+{
+ struct l_wait_info lwi = LWI_INTR(interrupted_oig, oig);
+ int rc;
+
+ CDEBUG(D_CACHE, "waiting for oig %p\n", oig);
+
+ do {
+ rc = l_wait_event(oig->oig_waitq, oig_done(oig), &lwi);
+ LASSERTF(rc == 0 || rc == -EINTR, "rc: %d\n", rc);
+ /* we can't continue until the oig has emptied and stopped
+ * referencing state that the caller will free upon return */
+ if (rc == -EINTR)
+ lwi = (struct l_wait_info){ 0, };
+ } while (rc == -EINTR);
+
+ LASSERTF(oig->oig_pending == 0,
+ "exiting oig_wait(oig = %p) with %d pending\n", oig,
+ oig->oig_pending);
+
+ CDEBUG(D_CACHE, "done waiting on oig %p rc %d\n", oig, oig->oig_rc);
+ return oig->oig_rc;
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff