X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lnet%2Flnet%2Flib-md.c;h=c1c1192962c3d557f95cbe694e47de04ffc761d5;hp=7cfce404152b388c20259d625c7c3c9627269462;hb=546993d587c5fc380e9745eae98f863e02e68575;hpb=0f8dca08a4f68cba82c2c822998ecc309d3b7aaf diff --git a/lnet/lnet/lib-md.c b/lnet/lnet/lib-md.c index 7cfce40..c1c1192 100644 --- a/lnet/lnet/lib-md.c +++ b/lnet/lnet/lib-md.c @@ -1,6 +1,4 @@ -/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- - * vim:expandtab:shiftwidth=8:tabstop=8: - * +/* * GPL HEADER START * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. @@ -17,17 +15,15 @@ * * 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 */ /* * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. + * + * Copyright (c) 2012, 2017, Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ @@ -42,315 +38,524 @@ #include -/* must be called with LNET_LOCK held */ +/* must be called with lnet_res_lock held */ void -lnet_md_unlink(lnet_libmd_t *md) +lnet_md_unlink(struct lnet_libmd *md) { - if ((md->md_flags & LNET_MD_FLAG_ZOMBIE) == 0) { - /* first unlink attempt... */ - lnet_me_t *me = md->md_me; - - md->md_flags |= LNET_MD_FLAG_ZOMBIE; - - /* Disassociate from ME (if any), and unlink it if it was created - * with LNET_UNLINK */ - if (me != NULL) { - md->md_me = NULL; - me->me_md = NULL; - if (me->me_unlink == LNET_UNLINK) - lnet_me_unlink(me); - } - - /* ensure all future handle lookups fail */ - lnet_invalidate_handle(&md->md_lh); - } - - if (md->md_refcount != 0) { - CDEBUG(D_NET, "Queueing unlink of md %p\n", md); - return; - } - - CDEBUG(D_NET, "Unlinking md %p\n", md); - - if (md->md_eq != NULL) { - md->md_eq->eq_refcount--; - LASSERT (md->md_eq->eq_refcount >= 0); - } - - LASSERT (!cfs_list_empty(&md->md_list)); - cfs_list_del_init (&md->md_list); - lnet_md_free(md); + if ((md->md_flags & LNET_MD_FLAG_ZOMBIE) == 0) { + /* first unlink attempt... */ + struct lnet_me *me = md->md_me; + + md->md_flags |= LNET_MD_FLAG_ZOMBIE; + + /* Disassociate from ME (if any), and unlink it if it was created + * with LNET_UNLINK */ + if (me != NULL) { + /* detach MD from portal */ + lnet_ptl_detach_md(me, md); + if (me->me_unlink == LNET_UNLINK) + lnet_me_unlink(me); + } + + /* ensure all future handle lookups fail */ + lnet_res_lh_invalidate(&md->md_lh); + } + + if (md->md_refcount != 0) { + CDEBUG(D_NET, "Queueing unlink of md %p\n", md); + return; + } + + CDEBUG(D_NET, "Unlinking md %p\n", md); + + if (md->md_eq != NULL) { + int cpt = lnet_cpt_of_cookie(md->md_lh.lh_cookie); + + LASSERT(*md->md_eq->eq_refs[cpt] > 0); + (*md->md_eq->eq_refs[cpt])--; + } + + LASSERT(!list_empty(&md->md_list)); + list_del_init(&md->md_list); + lnet_md_free(md); } -/* must be called with LNET_LOCK held */ -static int -lib_md_build(lnet_libmd_t *lmd, lnet_md_t *umd, int unlink) +struct page * +lnet_kvaddr_to_page(unsigned long vaddr) { - lnet_eq_t *eq = NULL; - int i; - unsigned int niov; - int total_length = 0; - - /* NB we are passed an allocated, but uninitialised/active md. - * if we return success, caller may lnet_md_unlink() it. - * otherwise caller may only lnet_md_free() it. - */ - - if (!LNetHandleIsInvalid (umd->eq_handle)) { - eq = lnet_handle2eq(&umd->eq_handle); - if (eq == NULL) - return -ENOENT; - } - - /* This implementation doesn't know how to create START events or - * disable END events. Best to LASSERT our caller is compliant so - * we find out quickly... */ - /* TODO - reevaluate what should be here in light of - * the removal of the start and end events - * maybe there we shouldn't even allow LNET_EQ_NONE!) - LASSERT (eq == NULL); - */ - - lmd->md_me = NULL; - lmd->md_start = umd->start; - lmd->md_offset = 0; - lmd->md_max_size = umd->max_size; - lmd->md_options = umd->options; - lmd->md_user_ptr = umd->user_ptr; - lmd->md_eq = eq; - lmd->md_threshold = umd->threshold; - lmd->md_refcount = 0; - lmd->md_flags = (unlink == LNET_UNLINK) ? LNET_MD_FLAG_AUTO_UNLINK : 0; - - if ((umd->options & LNET_MD_IOVEC) != 0) { - - if ((umd->options & LNET_MD_KIOV) != 0) /* Can't specify both */ - return -EINVAL; - - lmd->md_niov = niov = umd->length; - memcpy(lmd->md_iov.iov, umd->start, - niov * sizeof (lmd->md_iov.iov[0])); - - for (i = 0; i < (int)niov; i++) { - /* We take the base address on trust */ - if (lmd->md_iov.iov[i].iov_len <= 0) /* invalid length */ - return -EINVAL; - - total_length += lmd->md_iov.iov[i].iov_len; - } - - lmd->md_length = total_length; - - if ((umd->options & LNET_MD_MAX_SIZE) != 0 && /* max size used */ - (umd->max_size < 0 || - umd->max_size > total_length)) // illegal max_size - return -EINVAL; - - } else if ((umd->options & LNET_MD_KIOV) != 0) { -#ifndef __KERNEL__ - return -EINVAL; + if (is_vmalloc_addr((void *)vaddr)) + return vmalloc_to_page((void *)vaddr); + +#ifdef CONFIG_HIGHMEM + +#ifdef HAVE_KMAP_TO_PAGE + /* + * This ifdef is added to handle the kernel versions + * which have kmap_to_page() function exported. If so, + * we should use it. Otherwise, remain with the legacy check. + */ + return kmap_to_page((void *)vaddr); +#else + + if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) { + /* No highmem pages only used for bulk (kiov) I/O */ + CERROR("find page for address in highmem\n"); + LBUG(); + } + return virt_to_page(vaddr); +#endif /* HAVE_KMAP_TO_PAGE */ #else - lmd->md_niov = niov = umd->length; - memcpy(lmd->md_iov.kiov, umd->start, - niov * sizeof (lmd->md_iov.kiov[0])); - - for (i = 0; i < (int)niov; i++) { - /* We take the page pointer on trust */ - if (lmd->md_iov.kiov[i].kiov_offset + - lmd->md_iov.kiov[i].kiov_len > CFS_PAGE_SIZE ) - return -EINVAL; /* invalid length */ - - total_length += lmd->md_iov.kiov[i].kiov_len; - } - - lmd->md_length = total_length; - - if ((umd->options & LNET_MD_MAX_SIZE) != 0 && /* max size used */ - (umd->max_size < 0 || - umd->max_size > total_length)) // illegal max_size - return -EINVAL; -#endif - } else { /* contiguous */ - lmd->md_length = umd->length; - lmd->md_niov = niov = 1; - lmd->md_iov.iov[0].iov_base = umd->start; - lmd->md_iov.iov[0].iov_len = umd->length; - - if ((umd->options & LNET_MD_MAX_SIZE) != 0 && /* max size used */ - (umd->max_size < 0 || - umd->max_size > (int)umd->length)) // illegal max_size - return -EINVAL; - } - - if (eq != NULL) - eq->eq_refcount++; - - /* It's good; let handle2md succeed and add to active mds */ - lnet_initialise_handle (&lmd->md_lh, LNET_COOKIE_TYPE_MD); - LASSERT (cfs_list_empty(&lmd->md_list)); - cfs_list_add (&lmd->md_list, &the_lnet.ln_active_mds); - - return 0; + + return virt_to_page(vaddr); +#endif /* CONFIG_HIGHMEM */ +} +EXPORT_SYMBOL(lnet_kvaddr_to_page); + +int +lnet_cpt_of_md(struct lnet_libmd *md, unsigned int offset) +{ + int cpt = CFS_CPT_ANY; + unsigned int niov; + + /* + * if the md_options has a bulk handle then we want to look at the + * bulk md because that's the data which we will be DMAing + */ + if (md && (md->md_options & LNET_MD_BULK_HANDLE) != 0 && + !LNetMDHandleIsInvalid(md->md_bulk_handle)) + md = lnet_handle2md(&md->md_bulk_handle); + + if (!md || md->md_niov == 0) + return CFS_CPT_ANY; + + niov = md->md_niov; + + /* + * There are three cases to handle: + * 1. The MD is using lnet_kiov_t + * 2. The MD is using struct kvec + * 3. Contiguous buffer allocated via vmalloc + * + * in case 2 we can use virt_to_page() macro to get the page + * address of the memory kvec describes. + * + * in case 3 use is_vmalloc_addr() and vmalloc_to_page() + * + * The offset provided can be within the first iov/kiov entry or + * it could go beyond it. In that case we need to make sure to + * look at the page which actually contains the data that will be + * DMAed. + */ + if ((md->md_options & LNET_MD_KIOV) != 0) { + lnet_kiov_t *kiov = md->md_iov.kiov; + + while (offset >= kiov->kiov_len) { + offset -= kiov->kiov_len; + niov--; + kiov++; + if (niov == 0) { + CERROR("offset %d goes beyond kiov\n", offset); + goto out; + } + } + + cpt = cfs_cpt_of_node(lnet_cpt_table(), + page_to_nid(kiov->kiov_page)); + } else { + struct kvec *iov = md->md_iov.iov; + unsigned long vaddr; + struct page *page; + + while (offset >= iov->iov_len) { + offset -= iov->iov_len; + niov--; + iov++; + if (niov == 0) { + CERROR("offset %d goes beyond iov\n", offset); + goto out; + } + } + + vaddr = ((unsigned long)iov->iov_base) + offset; + page = lnet_kvaddr_to_page(vaddr); + if (!page) { + CERROR("Couldn't resolve vaddr 0x%lx to page\n", vaddr); + goto out; + } + cpt = cfs_cpt_of_node(lnet_cpt_table(), page_to_nid(page)); + } + +out: + return cpt; } -/* must be called with LNET_LOCK held */ +static int +lnet_md_build(struct lnet_libmd *lmd, struct lnet_md *umd, int unlink) +{ + int i; + unsigned int niov; + int total_length = 0; + + lmd->md_me = NULL; + lmd->md_start = umd->start; + lmd->md_offset = 0; + lmd->md_max_size = umd->max_size; + lmd->md_options = umd->options; + lmd->md_user_ptr = umd->user_ptr; + lmd->md_eq = NULL; + lmd->md_threshold = umd->threshold; + lmd->md_refcount = 0; + lmd->md_flags = (unlink == LNET_UNLINK) ? LNET_MD_FLAG_AUTO_UNLINK : 0; + lmd->md_bulk_handle = umd->bulk_handle; + + if ((umd->options & LNET_MD_IOVEC) != 0) { + + if ((umd->options & LNET_MD_KIOV) != 0) /* Can't specify both */ + return -EINVAL; + + lmd->md_niov = niov = umd->length; + memcpy(lmd->md_iov.iov, umd->start, + niov * sizeof(lmd->md_iov.iov[0])); + + for (i = 0; i < (int)niov; i++) { + /* We take the base address on trust */ + if (lmd->md_iov.iov[i].iov_len <= 0) /* invalid length */ + return -EINVAL; + + total_length += lmd->md_iov.iov[i].iov_len; + } + + lmd->md_length = total_length; + + if ((umd->options & LNET_MD_MAX_SIZE) != 0 && /* max size used */ + (umd->max_size < 0 || + umd->max_size > total_length)) // illegal max_size + return -EINVAL; + + } else if ((umd->options & LNET_MD_KIOV) != 0) { + lmd->md_niov = niov = umd->length; + memcpy(lmd->md_iov.kiov, umd->start, + niov * sizeof(lmd->md_iov.kiov[0])); + + for (i = 0; i < (int)niov; i++) { + /* We take the page pointer on trust */ + if (lmd->md_iov.kiov[i].kiov_offset + + lmd->md_iov.kiov[i].kiov_len > PAGE_SIZE) + return -EINVAL; /* invalid length */ + + total_length += lmd->md_iov.kiov[i].kiov_len; + } + + lmd->md_length = total_length; + + if ((umd->options & LNET_MD_MAX_SIZE) != 0 && /* max size used */ + (umd->max_size < 0 || + umd->max_size > total_length)) // illegal max_size + return -EINVAL; + } else { /* contiguous */ + lmd->md_length = umd->length; + lmd->md_niov = niov = 1; + lmd->md_iov.iov[0].iov_base = umd->start; + lmd->md_iov.iov[0].iov_len = umd->length; + + if ((umd->options & LNET_MD_MAX_SIZE) != 0 && /* max size used */ + (umd->max_size < 0 || + umd->max_size > (int)umd->length)) // illegal max_size + return -EINVAL; + } + + return 0; +} + +/* must be called with resource lock held */ +static int +lnet_md_link(struct lnet_libmd *md, struct lnet_handle_eq eq_handle, int cpt) +{ + struct lnet_res_container *container = the_lnet.ln_md_containers[cpt]; + + /* NB we are passed an allocated, but inactive md. + * if we return success, caller may lnet_md_unlink() it. + * otherwise caller may only lnet_md_free() it. + */ + /* This implementation doesn't know how to create START events or + * disable END events. Best to LASSERT our caller is compliant so + * we find out quickly... */ + /* TODO - reevaluate what should be here in light of + * the removal of the start and end events + * maybe there we shouldn't even allow LNET_EQ_NONE!) + * LASSERT (eq == NULL); + */ + if (!LNetEQHandleIsInvalid(eq_handle)) { + md->md_eq = lnet_handle2eq(&eq_handle); + + if (md->md_eq == NULL) + return -ENOENT; + + (*md->md_eq->eq_refs[cpt])++; + } + + lnet_res_lh_initialize(container, &md->md_lh); + + LASSERT(list_empty(&md->md_list)); + list_add(&md->md_list, &container->rec_active); + + return 0; +} + +/* must be called with lnet_res_lock held */ void -lnet_md_deconstruct(lnet_libmd_t *lmd, lnet_md_t *umd) +lnet_md_deconstruct(struct lnet_libmd *lmd, struct lnet_md *umd) { - /* NB this doesn't copy out all the iov entries so when a - * discontiguous MD is copied out, the target gets to know the - * original iov pointer (in start) and the number of entries it had - * and that's all. - */ - umd->start = lmd->md_start; - umd->length = ((lmd->md_options & (LNET_MD_IOVEC | LNET_MD_KIOV)) == 0) ? - lmd->md_length : lmd->md_niov; - umd->threshold = lmd->md_threshold; - umd->max_size = lmd->md_max_size; - umd->options = lmd->md_options; - umd->user_ptr = lmd->md_user_ptr; - lnet_eq2handle(&umd->eq_handle, lmd->md_eq); + /* NB this doesn't copy out all the iov entries so when a + * discontiguous MD is copied out, the target gets to know the + * original iov pointer (in start) and the number of entries it had + * and that's all. + */ + umd->start = lmd->md_start; + umd->length = ((lmd->md_options & (LNET_MD_IOVEC | LNET_MD_KIOV)) == 0) ? + lmd->md_length : lmd->md_niov; + umd->threshold = lmd->md_threshold; + umd->max_size = lmd->md_max_size; + umd->options = lmd->md_options; + umd->user_ptr = lmd->md_user_ptr; + lnet_eq2handle(&umd->eq_handle, lmd->md_eq); } -int -lnet_md_validate(lnet_md_t *umd) +static int +lnet_md_validate(struct lnet_md *umd) { - if (umd->start == NULL) { - CERROR("MD start pointer can not be NULL\n"); - return -EINVAL; - } - - if ((umd->options & (LNET_MD_KIOV | LNET_MD_IOVEC)) != 0 && - umd->length > LNET_MAX_IOV) { - CERROR("Invalid option: too many fragments %u, %d max\n", - umd->length, LNET_MAX_IOV); - return -EINVAL; - } - - return 0; + if (umd->start == NULL && umd->length != 0) { + CERROR("MD start pointer can not be NULL with length %u\n", + umd->length); + return -EINVAL; + } + + if ((umd->options & (LNET_MD_KIOV | LNET_MD_IOVEC)) != 0 && + umd->length > LNET_MAX_IOV) { + CERROR("Invalid option: too many fragments %u, %d max\n", + umd->length, LNET_MAX_IOV); + return -EINVAL; + } else if (umd->length > LNET_MTU) { + CERROR("Invalid length: too big fragment size %u, %d max\n", + umd->length, LNET_MTU); + return -EINVAL; + } + + return 0; } +/** + * Create a memory descriptor and attach it to a ME + * + * \param meh A handle for a ME to associate the new MD with. + * \param umd Provides initial values for the user-visible parts of a MD. + * Other than its use for initialization, there is no linkage between this + * structure and the MD maintained by the LNet. + * \param unlink A flag to indicate whether the MD is automatically unlinked + * when it becomes inactive, either because the operation threshold drops to + * zero or because the available memory becomes less than \a umd.max_size. + * (Note that the check for unlinking a MD only occurs after the completion + * of a successful operation on the MD.) The value LNET_UNLINK enables auto + * unlinking; the value LNET_RETAIN disables it. + * \param handle On successful returns, a handle to the newly created MD is + * saved here. This handle can be used later in LNetMDUnlink(). + * + * \retval 0 On success. + * \retval -EINVAL If \a umd is not valid. + * \retval -ENOMEM If new MD cannot be allocated. + * \retval -ENOENT Either \a meh or \a umd.eq_handle does not point to a + * valid object. Note that it's OK to supply a NULL \a umd.eq_handle by + * calling LNetInvalidateHandle() on it. + * \retval -EBUSY If the ME pointed to by \a meh is already associated with + * a MD. + */ int -LNetMDAttach(lnet_handle_me_t meh, lnet_md_t umd, - lnet_unlink_t unlink, lnet_handle_md_t *handle) +LNetMDAttach(struct lnet_handle_me meh, struct lnet_md umd, + enum lnet_unlink unlink, struct lnet_handle_md *handle) { - lnet_me_t *me; - lnet_libmd_t *md; - int rc; + LIST_HEAD(matches); + LIST_HEAD(drops); + struct lnet_me *me; + struct lnet_libmd *md; + int cpt; + int rc; + + LASSERT(the_lnet.ln_refcount > 0); - LASSERT (the_lnet.ln_init); - LASSERT (the_lnet.ln_refcount > 0); + if (lnet_md_validate(&umd) != 0) + return -EINVAL; - if (lnet_md_validate(&umd) != 0) - return -EINVAL; + if ((umd.options & (LNET_MD_OP_GET | LNET_MD_OP_PUT)) == 0) { + CERROR("Invalid option: no MD_OP set\n"); + return -EINVAL; + } - if ((umd.options & (LNET_MD_OP_GET | LNET_MD_OP_PUT)) == 0) { - CERROR("Invalid option: no MD_OP set\n"); - return -EINVAL; - } + md = lnet_md_alloc(&umd); + if (md == NULL) + return -ENOMEM; - md = lnet_md_alloc(&umd); - if (md == NULL) - return -ENOMEM; + rc = lnet_md_build(md, &umd, unlink); + if (rc != 0) + goto out_free; - LNET_LOCK(); + cpt = lnet_cpt_of_cookie(meh.cookie); - me = lnet_handle2me(&meh); - if (me == NULL) { - rc = -ENOENT; - } else if (me->me_md != NULL) { - rc = -EBUSY; - } else { - rc = lib_md_build(md, &umd, unlink); - if (rc == 0) { - the_lnet.ln_portals[me->me_portal].ptl_ml_version++; + lnet_res_lock(cpt); - me->me_md = md; - md->md_me = me; + me = lnet_handle2me(&meh); + if (me == NULL) + rc = -ENOENT; + else if (me->me_md != NULL) + rc = -EBUSY; + else + rc = lnet_md_link(md, umd.eq_handle, cpt); - lnet_md2handle(handle, md); + if (rc != 0) + goto out_unlock; - /* check if this MD matches any blocked msgs */ - lnet_match_blocked_msg(md); /* expects LNET_LOCK held */ + /* attach this MD to portal of ME and check if it matches any + * blocked msgs on this portal */ + lnet_ptl_attach_md(me, md, &matches, &drops); - LNET_UNLOCK(); - return (0); - } - } + lnet_md2handle(handle, md); - lnet_md_free (md); + lnet_res_unlock(cpt); - LNET_UNLOCK(); - return (rc); + lnet_drop_delayed_msg_list(&drops, "Bad match"); + lnet_recv_delayed_msg_list(&matches); + + return 0; + +out_unlock: + lnet_res_unlock(cpt); +out_free: + lnet_md_free(md); + return rc; } +EXPORT_SYMBOL(LNetMDAttach); +/** + * Create a "free floating" memory descriptor - a MD that is not associated + * with a ME. Such MDs are usually used in LNetPut() and LNetGet() operations. + * + * \param umd,unlink See the discussion for LNetMDAttach(). + * \param handle On successful returns, a handle to the newly created MD is + * saved here. This handle can be used later in LNetMDUnlink(), LNetPut(), + * and LNetGet() operations. + * + * \retval 0 On success. + * \retval -EINVAL If \a umd is not valid. + * \retval -ENOMEM If new MD cannot be allocated. + * \retval -ENOENT \a umd.eq_handle does not point to a valid EQ. Note that + * it's OK to supply a NULL \a umd.eq_handle by calling + * LNetInvalidateHandle() on it. + */ int -LNetMDBind(lnet_md_t umd, lnet_unlink_t unlink, lnet_handle_md_t *handle) +LNetMDBind(struct lnet_md umd, enum lnet_unlink unlink, + struct lnet_handle_md *handle) { - lnet_libmd_t *md; - int rc; + struct lnet_libmd *md; + int cpt; + int rc; + + LASSERT(the_lnet.ln_refcount > 0); - LASSERT (the_lnet.ln_init); - LASSERT (the_lnet.ln_refcount > 0); + if (lnet_md_validate(&umd) != 0) + return -EINVAL; - if (lnet_md_validate(&umd) != 0) - return -EINVAL; + if ((umd.options & (LNET_MD_OP_GET | LNET_MD_OP_PUT)) != 0) { + CERROR("Invalid option: GET|PUT illegal on active MDs\n"); + return -EINVAL; + } - if ((umd.options & (LNET_MD_OP_GET | LNET_MD_OP_PUT)) != 0) { - CERROR("Invalid option: GET|PUT illegal on active MDs\n"); - return -EINVAL; - } + md = lnet_md_alloc(&umd); + if (md == NULL) + return -ENOMEM; - md = lnet_md_alloc(&umd); - if (md == NULL) - return -ENOMEM; + rc = lnet_md_build(md, &umd, unlink); + if (rc != 0) + goto out_free; - LNET_LOCK(); + cpt = lnet_res_lock_current(); - rc = lib_md_build(md, &umd, unlink); + rc = lnet_md_link(md, umd.eq_handle, cpt); + if (rc != 0) + goto out_unlock; - if (rc == 0) { - lnet_md2handle(handle, md); + lnet_md2handle(handle, md); - LNET_UNLOCK(); - return (0); - } + lnet_res_unlock(cpt); + return 0; - lnet_md_free (md); + out_unlock: + lnet_res_unlock(cpt); - LNET_UNLOCK(); - return (rc); + out_free: + lnet_md_free(md); + return rc; } +EXPORT_SYMBOL(LNetMDBind); +/** + * Unlink the memory descriptor from any ME it may be linked to and release + * the internal resources associated with it. As a result, active messages + * associated with the MD may get aborted. + * + * This function does not free the memory region associated with the MD; + * i.e., the memory the user allocated for this MD. If the ME associated with + * this MD is not NULL and was created with auto unlink enabled, the ME is + * unlinked as well (see LNetMEAttach()). + * + * Explicitly unlinking a MD via this function call has the same behavior as + * a MD that has been automatically unlinked, except that no LNET_EVENT_UNLINK + * is generated in the latter case. + * + * An unlinked event can be reported in two ways: + * - If there's no pending operations on the MD, it's unlinked immediately + * and an LNET_EVENT_UNLINK event is logged before this function returns. + * - Otherwise, the MD is only marked for deletion when this function + * returns, and the unlinked event will be piggybacked on the event of + * the completion of the last operation by setting the unlinked field of + * the event. No dedicated LNET_EVENT_UNLINK event is generated. + * + * Note that in both cases the unlinked field of the event is always set; no + * more event will happen on the MD after such an event is logged. + * + * \param mdh A handle for the MD to be unlinked. + * + * \retval 0 On success. + * \retval -ENOENT If \a mdh does not point to a valid MD object. + */ int -LNetMDUnlink (lnet_handle_md_t mdh) +LNetMDUnlink(struct lnet_handle_md mdh) { - lnet_event_t ev; - lnet_libmd_t *md; - - LASSERT (the_lnet.ln_init); - LASSERT (the_lnet.ln_refcount > 0); - - LNET_LOCK(); - - md = lnet_handle2md(&mdh); - if (md == NULL) { - LNET_UNLOCK(); - return -ENOENT; - } - - /* If the MD is busy, lnet_md_unlink just marks it for deletion, and - * when the NAL is done, the completion event flags that the MD was - * unlinked. Otherwise, we enqueue an event now... */ - - if (md->md_eq != NULL && - md->md_refcount == 0) { - lnet_build_unlink_event(md, &ev); - lnet_enq_event_locked(md->md_eq, &ev); - } - - lnet_md_unlink(md); - - LNET_UNLOCK(); - return 0; + struct lnet_event ev; + struct lnet_libmd *md; + int cpt; + + LASSERT(the_lnet.ln_refcount > 0); + + cpt = lnet_cpt_of_cookie(mdh.cookie); + lnet_res_lock(cpt); + + md = lnet_handle2md(&mdh); + if (md == NULL) { + lnet_res_unlock(cpt); + return -ENOENT; + } + + md->md_flags |= LNET_MD_FLAG_ABORTED; + /* If the MD is busy, lnet_md_unlink just marks it for deletion, and + * when the LND is done, the completion event flags that the MD was + * unlinked. Otherwise, we enqueue an event now... */ + if (md->md_eq != NULL && md->md_refcount == 0) { + lnet_build_unlink_event(md, &ev); + lnet_eq_enqueue_event(md->md_eq, &ev); + } + + lnet_md_unlink(md); + + lnet_res_unlock(cpt); + return 0; } +EXPORT_SYMBOL(LNetMDUnlink);