1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (c) 2004 Cluster File Systems, Inc.
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #define DEBUG_SUBSYSTEM S_RPC
26 #include <liblustre.h>
29 #include <linux/obd_support.h>
30 #include <linux/obd_class.h>
31 #include <linux/lustre_lib.h>
32 #include <linux/lustre_ha.h>
33 #include <linux/lustre_import.h>
35 #include "ptlrpc_internal.h"
40 void ptlrpc_fill_bulk_md (ptl_md_t *md, struct ptlrpc_bulk_desc *desc)
42 LASSERT (desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
43 LASSERT (!(md->options & (PTL_MD_IOVEC | PTL_MD_KIOV | PTL_MD_PHYS)));
45 md->options |= PTL_MD_KIOV;
46 md->start = &desc->bd_iov[0];
47 md->length = desc->bd_iov_count;
50 void ptlrpc_add_bulk_page(struct ptlrpc_bulk_desc *desc, struct page *page,
51 int pageoffset, int len)
53 ptl_kiov_t *kiov = &desc->bd_iov[desc->bd_iov_count];
55 kiov->kiov_page = page;
56 kiov->kiov_offset = pageoffset;
62 #else /* CRAY_PORTALS */
64 #error "Conflicting compilation directives"
67 void ptlrpc_fill_bulk_md (ptl_md_t *md, struct ptlrpc_bulk_desc *desc)
69 LASSERT (desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
70 LASSERT (!(md->options & (PTL_MD_IOVEC | PTL_MD_PHYS)));
72 md->options |= (PTL_MD_IOVEC | PTL_MD_PHYS);
73 md->start = &desc->bd_iov[0];
74 md->length = desc->bd_iov_count;
77 void ptlrpc_add_bulk_page(struct ptlrpc_bulk_desc *desc, struct page *page,
78 int pageoffset, int len)
80 ptl_md_iovec_t *iov = &desc->bd_iov[desc->bd_iov_count];
82 /* Should get a compiler warning if sizeof(physaddr) > sizeof(void *) */
83 iov->iov_base = (void *)(page_to_phys(page) + pageoffset);
89 #endif /* CRAY_PORTALS */
90 #else /* !__KERNEL__ */
92 void ptlrpc_fill_bulk_md(ptl_md_t *md, struct ptlrpc_bulk_desc *desc)
95 LASSERT (!(md->options & (PTL_MD_IOVEC | PTL_MD_PHYS)));
96 LASSERT (desc->bd_iov_count == 1);
98 LASSERT (!(md->options & (PTL_MD_IOVEC | PTL_MD_KIOV | PTL_MD_PHYS)));
100 if (desc->bd_iov_count == 1) {
101 md->start = desc->bd_iov[0].iov_base;
102 md->length = desc->bd_iov[0].iov_len;
106 md->options |= PTL_MD_IOVEC;
107 md->start = &desc->bd_iov[0];
108 md->length = desc->bd_iov_count;
111 static int can_merge_iovs(ptl_md_iovec_t *existing, ptl_md_iovec_t *candidate)
113 if (existing->iov_base + existing->iov_len == candidate->iov_base)
116 /* Enable this section to provide earlier evidence of fragmented bulk */
117 CERROR("Can't merge iovs %p for %x, %p for %x\n",
118 existing->iov_base, existing->iov_len,
119 candidate->iov_base, candidate->iov_len);
124 void ptlrpc_add_bulk_page(struct ptlrpc_bulk_desc *desc, struct page *page,
125 int pageoffset, int len)
127 ptl_md_iovec_t *iov = &desc->bd_iov[desc->bd_iov_count];
129 iov->iov_base = page->addr + pageoffset;
132 if (desc->bd_iov_count > 0 && can_merge_iovs(iov - 1, iov)) {
133 (iov - 1)->iov_len += len;
135 desc->bd_iov_count++;
139 #endif /* !__KERNEL__ */