+++ /dev/null
-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
- * lib/lib-md.c
- * Memory Descriptor management routines
- *
- * Copyright (c) 2001-2003 Cluster File Systems, Inc.
- * Copyright (c) 2001-2002 Sandia National Laboratories
- *
- * This file is part of Lustre, http://www.sf.net/projects/lustre/
- *
- * 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.
- *
- * 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.
- *
- * 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.
- */
-
-#ifndef __KERNEL__
-# include <stdio.h>
-#else
-# define DEBUG_SUBSYSTEM S_PORTALS
-# include <linux/kp30.h>
-#endif
-
-#include <portals/lib-p30.h>
-
-/* must be called with state lock held */
-void
-lib_md_unlink(lib_nal_t *nal, lib_md_t *md)
-{
- if ((md->md_flags & PTL_MD_FLAG_ZOMBIE) == 0) {
- /* first unlink attempt... */
- lib_me_t *me = md->me;
-
- md->md_flags |= PTL_MD_FLAG_ZOMBIE;
-
- /* Disassociate from ME (if any), and unlink it if it was created
- * with PTL_UNLINK */
- if (me != NULL) {
- me->md = NULL;
- if (me->unlink == PTL_UNLINK)
- lib_me_unlink(nal, me);
- }
-
- /* emsure all future handle lookups fail */
- lib_invalidate_handle(nal, &md->md_lh);
- }
-
- if (md->pending != 0) {
- CDEBUG(D_NET, "Queueing unlink of md %p\n", md);
- return;
- }
-
- CDEBUG(D_NET, "Unlinking md %p\n", md);
-
- if ((md->options & PTL_MD_KIOV) != 0) {
- if (nal->libnal_unmap_pages != NULL)
- nal->libnal_unmap_pages (nal,
- md->md_niov,
- md->md_iov.kiov,
- &md->md_addrkey);
- } else if (nal->libnal_unmap != NULL) {
- nal->libnal_unmap (nal,
- md->md_niov, md->md_iov.iov,
- &md->md_addrkey);
- }
-
- if (md->eq != NULL) {
- md->eq->eq_refcount--;
- LASSERT (md->eq->eq_refcount >= 0);
- }
-
- list_del (&md->md_list);
- lib_md_free(nal, md);
-}
-
-/* must be called with state lock held */
-static int
-lib_md_build(lib_nal_t *nal, lib_md_t *lmd, ptl_md_t *umd, int unlink)
-{
- lib_eq_t *eq = NULL;
- int rc;
- int i;
- int niov;
- int total_length = 0;
-
- /* NB we are passed an allocated, but uninitialised/active md.
- * if we return success, caller may lib_md_unlink() it.
- * otherwise caller may only lib_md_free() it.
- */
-
- if (!PtlHandleIsEqual (umd->eq_handle, PTL_EQ_NONE)) {
- eq = ptl_handle2eq(&umd->eq_handle, nal);
- if (eq == NULL)
- return PTL_EQ_INVALID;
- }
-
- /* 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... */
- LASSERT (eq == NULL ||
- ((umd->options & PTL_MD_EVENT_START_DISABLE) != 0 &&
- (umd->options & PTL_MD_EVENT_END_DISABLE) == 0));
-
- lmd->me = NULL;
- lmd->start = umd->start;
- lmd->offset = 0;
- lmd->max_size = umd->max_size;
- lmd->options = umd->options;
- lmd->user_ptr = umd->user_ptr;
- lmd->eq = eq;
- lmd->threshold = umd->threshold;
- lmd->pending = 0;
- lmd->md_flags = (unlink == PTL_UNLINK) ? PTL_MD_FLAG_AUTO_UNLINK : 0;
-
- if ((umd->options & PTL_MD_IOVEC) != 0) {
-
- if ((umd->options & PTL_MD_KIOV) != 0) /* Can't specify both */
- return PTL_MD_ILLEGAL;
-
- lmd->md_niov = niov = umd->length;
- memcpy(lmd->md_iov.iov, umd->start,
- niov * sizeof (lmd->md_iov.iov[0]));
-
- for (i = 0; i < niov; i++) {
- /* We take the base address on trust */
- if (lmd->md_iov.iov[i].iov_len <= 0) /* invalid length */
- return PTL_MD_ILLEGAL;
-
- total_length += lmd->md_iov.iov[i].iov_len;
- }
-
- lmd->length = total_length;
-
- if ((umd->options & PTL_MD_MAX_SIZE) != 0 && /* max size used */
- (umd->max_size < 0 ||
- umd->max_size > total_length)) // illegal max_size
- return PTL_MD_ILLEGAL;
-
- if (nal->libnal_map != NULL) {
- rc = nal->libnal_map (nal, niov, lmd->md_iov.iov,
- &lmd->md_addrkey);
- if (rc != PTL_OK)
- return (rc);
- }
- } else if ((umd->options & PTL_MD_KIOV) != 0) {
-#ifndef __KERNEL__
- return PTL_MD_ILLEGAL;
-#else
- /* Trap attempt to use paged I/O if unsupported early. */
- if (nal->libnal_send_pages == NULL ||
- nal->libnal_recv_pages == NULL)
- return PTL_MD_INVALID;
-
- lmd->md_niov = niov = umd->length;
- memcpy(lmd->md_iov.kiov, umd->start,
- niov * sizeof (lmd->md_iov.kiov[0]));
-
- for (i = 0; i < 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 PTL_VAL_FAILED; /* invalid length */
-
- total_length += lmd->md_iov.kiov[i].kiov_len;
- }
-
- lmd->length = total_length;
-
- if ((umd->options & PTL_MD_MAX_SIZE) != 0 && /* max size used */
- (umd->max_size < 0 ||
- umd->max_size > total_length)) // illegal max_size
- return PTL_MD_ILLEGAL;
-
- if (nal->libnal_map_pages != NULL) {
- rc = nal->libnal_map_pages (nal, niov, lmd->md_iov.kiov,
- &lmd->md_addrkey);
- if (rc != PTL_OK)
- return (rc);
- }
-#endif
- } else { /* contiguous */
- lmd->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 & PTL_MD_MAX_SIZE) != 0 && /* max size used */
- (umd->max_size < 0 ||
- umd->max_size > umd->length)) // illegal max_size
- return PTL_MD_ILLEGAL;
-
- if (nal->libnal_map != NULL) {
- rc = nal->libnal_map (nal, niov, lmd->md_iov.iov,
- &lmd->md_addrkey);
- if (rc != PTL_OK)
- return (rc);
- }
- }
-
- if (eq != NULL)
- eq->eq_refcount++;
-
- /* It's good; let handle2md succeed and add to active mds */
- lib_initialise_handle (nal, &lmd->md_lh, PTL_COOKIE_TYPE_MD);
- list_add (&lmd->md_list, &nal->libnal_ni.ni_active_mds);
-
- return PTL_OK;
-}
-
-/* must be called with state lock held */
-void
-lib_md_deconstruct(lib_nal_t *nal, lib_md_t *lmd, ptl_md_t *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->start;
- umd->length = ((lmd->options & (PTL_MD_IOVEC | PTL_MD_KIOV)) == 0) ?
- lmd->length : lmd->md_niov;
- umd->threshold = lmd->threshold;
- umd->max_size = lmd->max_size;
- umd->options = lmd->options;
- umd->user_ptr = lmd->user_ptr;
- ptl_eq2handle(&umd->eq_handle, nal, lmd->eq);
-}
-
-int
-lib_api_md_attach(nal_t *apinal, ptl_handle_me_t *meh,
- ptl_md_t *umd, ptl_unlink_t unlink,
- ptl_handle_md_t *handle)
-{
- lib_nal_t *nal = apinal->nal_data;
- lib_me_t *me;
- lib_md_t *md;
- unsigned long flags;
- int rc;
-
- if ((umd->options & (PTL_MD_KIOV | PTL_MD_IOVEC)) != 0 &&
- umd->length > PTL_MD_MAX_IOV) /* too many fragments */
- return PTL_IOV_INVALID;
-
- md = lib_md_alloc(nal, umd);
- if (md == NULL)
- return PTL_NO_SPACE;
-
- LIB_LOCK(nal, flags);
-
- me = ptl_handle2me(meh, nal);
- if (me == NULL) {
- rc = PTL_ME_INVALID;
- } else if (me->md != NULL) {
- rc = PTL_ME_IN_USE;
- } else {
- rc = lib_md_build(nal, md, umd, unlink);
- if (rc == PTL_OK) {
- me->md = md;
- md->me = me;
-
- ptl_md2handle(handle, nal, md);
-
- LIB_UNLOCK(nal, flags);
- return (PTL_OK);
- }
- }
-
- lib_md_free (nal, md);
-
- LIB_UNLOCK(nal, flags);
- return (rc);
-}
-
-int
-lib_api_md_bind(nal_t *apinal,
- ptl_md_t *umd, ptl_unlink_t unlink,
- ptl_handle_md_t *handle)
-{
- lib_nal_t *nal = apinal->nal_data;
- lib_md_t *md;
- unsigned long flags;
- int rc;
-
- if ((umd->options & (PTL_MD_KIOV | PTL_MD_IOVEC)) != 0 &&
- umd->length > PTL_MD_MAX_IOV) /* too many fragments */
- return PTL_IOV_INVALID;
-
- md = lib_md_alloc(nal, umd);
- if (md == NULL)
- return PTL_NO_SPACE;
-
- LIB_LOCK(nal, flags);
-
- rc = lib_md_build(nal, md, umd, unlink);
-
- if (rc == PTL_OK) {
- ptl_md2handle(handle, nal, md);
-
- LIB_UNLOCK(nal, flags);
- return (PTL_OK);
- }
-
- lib_md_free (nal, md);
-
- LIB_UNLOCK(nal, flags);
- return (rc);
-}
-
-int
-lib_api_md_unlink (nal_t *apinal, ptl_handle_md_t *mdh)
-{
- lib_nal_t *nal = apinal->nal_data;
- ptl_event_t ev;
- lib_md_t *md;
- unsigned long flags;
-
- LIB_LOCK(nal, flags);
-
- md = ptl_handle2md(mdh, nal);
- if (md == NULL) {
- LIB_UNLOCK(nal, flags);
- return PTL_MD_INVALID;
- }
-
- /* If the MD is busy, lib_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->eq != NULL &&
- md->pending == 0) {
- memset(&ev, 0, sizeof(ev));
-
- ev.type = PTL_EVENT_UNLINK;
- ev.ni_fail_type = PTL_OK;
- ev.unlinked = 1;
- lib_md_deconstruct(nal, md, &ev.md);
- ptl_md2handle(&ev.md_handle, nal, md);
-
- lib_enq_event_locked(nal, NULL, md->eq, &ev);
- }
-
- lib_md_unlink(nal, md);
-
- LIB_UNLOCK(nal, flags);
- return PTL_OK;
-}
-
-int
-lib_api_md_update (nal_t *apinal,
- ptl_handle_md_t *mdh,
- ptl_md_t *oldumd, ptl_md_t *newumd,
- ptl_handle_eq_t *testqh)
-{
- lib_nal_t *nal = apinal->nal_data;
- lib_md_t *md;
- lib_eq_t *test_eq = NULL;
- unsigned long flags;
- int rc;
-
- LIB_LOCK(nal, flags);
-
- md = ptl_handle2md(mdh, nal);
- if (md == NULL) {
- rc = PTL_MD_INVALID;
- goto out;
- }
-
- if (oldumd != NULL)
- lib_md_deconstruct(nal, md, oldumd);
-
- if (newumd == NULL) {
- rc = PTL_OK;
- goto out;
- }
-
- /* XXX fttb, the new MD must be the same "shape" wrt fragmentation,
- * since we simply overwrite the old lib-md */
- if ((((newumd->options ^ md->options) &
- (PTL_MD_IOVEC | PTL_MD_KIOV)) != 0) ||
- ((newumd->options & (PTL_MD_IOVEC | PTL_MD_KIOV)) != 0 &&
- newumd->length != md->md_niov)) {
- rc = PTL_IOV_INVALID;
- goto out;
- }
-
- if (!PtlHandleIsEqual (*testqh, PTL_EQ_NONE)) {
- test_eq = ptl_handle2eq(testqh, nal);
- if (test_eq == NULL) {
- rc = PTL_EQ_INVALID;
- goto out;
- }
- }
-
- if (md->pending != 0) {
- rc = PTL_MD_NO_UPDATE;
- goto out;
- }
-
- if (test_eq == NULL ||
- test_eq->eq_deq_seq == test_eq->eq_enq_seq) {
- lib_me_t *me = md->me;
- int unlink = (md->md_flags & PTL_MD_FLAG_AUTO_UNLINK) ?
- PTL_UNLINK : PTL_RETAIN;
-
- // #warning this does not track eq refcounts properly
- rc = lib_md_build(nal, md, newumd, unlink);
-
- md->me = me;
- } else {
- rc = PTL_MD_NO_UPDATE;
- }
-
- out:
- LIB_UNLOCK(nal, flags);
-
- return rc;
-}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff