diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/include/lustre_mdc.h')
| -rw-r--r-- | drivers/staging/lustre/lustre/include/lustre_mdc.h | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/include/lustre_mdc.h b/drivers/staging/lustre/lustre/include/lustre_mdc.h new file mode 100644 index 000000000000..fb1561a809b9 --- /dev/null +++ b/drivers/staging/lustre/lustre/include/lustre_mdc.h @@ -0,0 +1,176 @@ +/* + * GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. + * + * This program 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 version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + * GPL HEADER END + */ +/* + * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + */ +/* + * Copyright (c) 2011, 2012, Intel Corporation. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + * + * lustre/include/lustre_mdc.h + * + * MDS data structures. + * See also lustre_idl.h for wire formats of requests. + */ + +#ifndef _LUSTRE_MDC_H +#define _LUSTRE_MDC_H + +/** \defgroup mdc mdc + * + * @{ + */ + +# include <linux/fs.h> +# include <linux/dcache.h> +# ifdef CONFIG_FS_POSIX_ACL +# include <linux/posix_acl_xattr.h> +# endif /* CONFIG_FS_POSIX_ACL */ +# include <linux/lustre_intent.h> +#include <lustre_handles.h> +#include <linux/libcfs/libcfs.h> +#include <obd_class.h> +#include <lustre/lustre_idl.h> +#include <lustre_lib.h> +#include <lustre_dlm.h> +#include <lustre_export.h> + +struct ptlrpc_client; +struct obd_export; +struct ptlrpc_request; +struct obd_device; + +struct mdc_rpc_lock { + struct mutex rpcl_mutex; + struct lookup_intent *rpcl_it; + int rpcl_fakes; +}; + +#define MDC_FAKE_RPCL_IT ((void *)0x2c0012bfUL) + +static inline void mdc_init_rpc_lock(struct mdc_rpc_lock *lck) +{ + mutex_init(&lck->rpcl_mutex); + lck->rpcl_it = NULL; +} + +static inline void mdc_get_rpc_lock(struct mdc_rpc_lock *lck, + struct lookup_intent *it) +{ + ENTRY; + + if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP)) + return; + + /* This would normally block until the existing request finishes. + * If fail_loc is set it will block until the regular request is + * done, then set rpcl_it to MDC_FAKE_RPCL_IT. Once that is set + * it will only be cleared when all fake requests are finished. + * Only when all fake requests are finished can normal requests + * be sent, to ensure they are recoverable again. */ + again: + mutex_lock(&lck->rpcl_mutex); + + if (CFS_FAIL_CHECK_QUIET(OBD_FAIL_MDC_RPCS_SEM)) { + lck->rpcl_it = MDC_FAKE_RPCL_IT; + lck->rpcl_fakes++; + mutex_unlock(&lck->rpcl_mutex); + return; + } + + /* This will only happen when the CFS_FAIL_CHECK() was + * just turned off but there are still requests in progress. + * Wait until they finish. It doesn't need to be efficient + * in this extremely rare case, just have low overhead in + * the common case when it isn't true. */ + while (unlikely(lck->rpcl_it == MDC_FAKE_RPCL_IT)) { + mutex_unlock(&lck->rpcl_mutex); + schedule_timeout(cfs_time_seconds(1) / 4); + goto again; + } + + LASSERT(lck->rpcl_it == NULL); + lck->rpcl_it = it; +} + +static inline void mdc_put_rpc_lock(struct mdc_rpc_lock *lck, + struct lookup_intent *it) +{ + if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP)) + goto out; + + if (lck->rpcl_it == MDC_FAKE_RPCL_IT) { /* OBD_FAIL_MDC_RPCS_SEM */ + mutex_lock(&lck->rpcl_mutex); + + LASSERTF(lck->rpcl_fakes > 0, "%d\n", lck->rpcl_fakes); + lck->rpcl_fakes--; + + if (lck->rpcl_fakes == 0) + lck->rpcl_it = NULL; + + } else { + LASSERTF(it == lck->rpcl_it, "%p != %p\n", it, lck->rpcl_it); + lck->rpcl_it = NULL; + } + + mutex_unlock(&lck->rpcl_mutex); + out: + EXIT; +} + +static inline void mdc_update_max_ea_from_body(struct obd_export *exp, + struct mdt_body *body) +{ + if (body->valid & OBD_MD_FLMODEASIZE) { + if (exp->exp_obd->u.cli.cl_max_mds_easize < body->max_mdsize) + exp->exp_obd->u.cli.cl_max_mds_easize = + body->max_mdsize; + if (exp->exp_obd->u.cli.cl_max_mds_cookiesize < + body->max_cookiesize) + exp->exp_obd->u.cli.cl_max_mds_cookiesize = + body->max_cookiesize; + } +} + + +struct mdc_cache_waiter { + struct list_head mcw_entry; + wait_queue_head_t mcw_waitq; +}; + +/* mdc/mdc_locks.c */ +int it_disposition(struct lookup_intent *it, int flag); +void it_clear_disposition(struct lookup_intent *it, int flag); +void it_set_disposition(struct lookup_intent *it, int flag); +int it_open_error(int phase, struct lookup_intent *it); + +/** @} mdc */ + +#endif |