X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Finclude%2Flustre_mdc.h;h=be0eb7742e644d99b87f09e29bf8c760e491e446;hb=0844905a308d614c86b56df70c8f03e5d59ee286;hp=6cb5f01402282f20244066af0edee6b451c37a80;hpb=a104459086c0e550e11d73eba635a72a1a282eb0;p=fs%2Flustre-release.git diff --git a/lustre/include/lustre_mdc.h b/lustre/include/lustre_mdc.h index 6cb5f01..be0eb77 100644 --- a/lustre/include/lustre_mdc.h +++ b/lustre/include/lustre_mdc.h @@ -15,11 +15,7 @@ * * 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. + * http://www.gnu.org/licenses/gpl-2.0.html * * GPL HEADER END */ @@ -28,7 +24,7 @@ * Use is subject to license terms. */ /* - * Copyright (c) 2011, 2012, Intel Corporation. + * Copyright (c) 2011, 2014, Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ @@ -48,15 +44,13 @@ * @{ */ -#ifdef __KERNEL__ -# include -# include -# ifdef CONFIG_FS_POSIX_ACL -# include -# endif /* CONFIG_FS_POSIX_ACL */ -# include -#endif /* __KERNEL__ */ +#include +#include +#ifdef CONFIG_FS_POSIX_ACL +# include +#endif /* CONFIG_FS_POSIX_ACL */ #include +#include #include #include #include @@ -69,9 +63,27 @@ struct obd_export; struct ptlrpc_request; struct obd_device; +/** + * Serializes in-flight MDT-modifying RPC requests to preserve idempotency. + * + * This mutex is used to implement execute-once semantics on the MDT. + * The MDT stores the last transaction ID and result for every client in + * its last_rcvd file. If the client doesn't get a reply, it can safely + * resend the request and the MDT will reconstruct the reply being aware + * that the request has already been executed. Without this lock, + * execution status of concurrent in-flight requests would be + * overwritten. + * + * This design limits the extent to which we can keep a full pipeline of + * in-flight requests from a single client. This limitation could be + * overcome by allowing multiple slots per client in the last_rcvd file. + */ struct mdc_rpc_lock { + /** Lock protecting in-flight RPC concurrency. */ struct mutex rpcl_mutex; + /** Intent associated with currently executing request. */ struct lookup_intent *rpcl_it; + /** Used for MDS/RPC load testing purposes. */ int rpcl_fakes; }; @@ -89,7 +101,7 @@ static inline void mdc_get_rpc_lock(struct mdc_rpc_lock *lck, ENTRY; if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP || - it->it_op == IT_LAYOUT)) + it->it_op == IT_LAYOUT || it->it_op == IT_READDIR)) return; /* This would normally block until the existing request finishes. @@ -115,7 +127,7 @@ static inline void mdc_get_rpc_lock(struct mdc_rpc_lock *lck, * the common case when it isn't true. */ while (unlikely(lck->rpcl_it == MDC_FAKE_RPCL_IT)) { mutex_unlock(&lck->rpcl_mutex); - cfs_schedule_timeout(cfs_time_seconds(1) / 4); + schedule_timeout(cfs_time_seconds(1) / 4); goto again; } @@ -127,7 +139,7 @@ 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 || - it->it_op == IT_LAYOUT)) + it->it_op == IT_LAYOUT || it->it_op == IT_READDIR)) goto out; if (lck->rpcl_it == MDC_FAKE_RPCL_IT) { /* OBD_FAIL_MDC_RPCS_SEM */ @@ -149,35 +161,78 @@ static inline void mdc_put_rpc_lock(struct mdc_rpc_lock *lck, EXIT; } -static inline void mdc_update_max_ea_from_body(struct obd_export *exp, - struct mdt_body *body) +static inline void mdc_get_mod_rpc_slot(struct ptlrpc_request *req, + struct lookup_intent *it) { - 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 client_obd *cli = &req->rq_import->imp_obd->u.cli; + __u32 opc; + __u16 tag; + + opc = lustre_msg_get_opc(req->rq_reqmsg); + tag = obd_get_mod_rpc_slot(cli, opc, it); + lustre_msg_set_tag(req->rq_reqmsg, tag); } +static inline void mdc_put_mod_rpc_slot(struct ptlrpc_request *req, + struct lookup_intent *it) +{ + struct client_obd *cli = &req->rq_import->imp_obd->u.cli; + __u32 opc; + __u16 tag; + + opc = lustre_msg_get_opc(req->rq_reqmsg); + tag = lustre_msg_get_tag(req->rq_reqmsg); + obd_put_mod_rpc_slot(cli, opc, it, tag); +} + + +/** + * Update the maximum possible easize. + * + * This value is learned from ptlrpc replies sent by the MDT. The + * default easize is initialized to the minimum value but allowed to + * grow up to a single page in size if required to handle the common + * case. + * + * \see client_obd::cl_default_mds_easize + * + * \param[in] exp export for MDC device + * \param[in] body body of ptlrpc reply from MDT + * + */ +static inline void mdc_update_max_ea_from_body(struct obd_export *exp, + struct mdt_body *body) +{ + if (body->mbo_valid & OBD_MD_FLMODEASIZE) { + struct client_obd *cli = &exp->exp_obd->u.cli; + __u32 def_easize; + + if (cli->cl_max_mds_easize < body->mbo_max_mdsize) + cli->cl_max_mds_easize = body->mbo_max_mdsize; + + def_easize = min_t(__u32, body->mbo_max_mdsize, + OBD_MAX_DEFAULT_EA_SIZE); + cli->cl_default_mds_easize = def_easize; + } +} -struct mdc_cache_waiter { - cfs_list_t mcw_entry; - cfs_waitq_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); -#ifdef HAVE_SPLIT_SUPPORT -int mdc_sendpage(struct obd_export *exp, const struct lu_fid *fid, - const struct page *page, int offset); -#endif + +static inline bool cl_is_lov_delay_create(unsigned int flags) +{ + return (flags & O_LOV_DELAY_CREATE_1_8) != 0 || + (flags & O_LOV_DELAY_CREATE_MASK) == O_LOV_DELAY_CREATE_MASK; +} + +static inline void cl_lov_delay_create_clear(unsigned int *flags) +{ + if ((*flags & O_LOV_DELAY_CREATE_1_8) != 0) + *flags &= ~O_LOV_DELAY_CREATE_1_8; + if ((*flags & O_LOV_DELAY_CREATE_MASK) == O_LOV_DELAY_CREATE_MASK) + *flags &= ~O_LOV_DELAY_CREATE_MASK; +} /** @} mdc */