1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Lustre Lite I/O page cache for the 2.4 kernel version
6 * Copyright (c) 2001-2003 Cluster File Systems, Inc.
8 * This file is part of Lustre, http://www.lustre.org.
10 * Lustre is free software; you can redistribute it and/or
11 * modify it under the terms of version 2 of the GNU General Public
12 * License as published by the Free Software Foundation.
14 * Lustre is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with Lustre; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <linux/config.h>
25 #include <linux/kernel.h>
27 #include <linux/string.h>
28 #include <linux/stat.h>
29 #include <linux/errno.h>
30 #include <linux/smp_lock.h>
31 #include <linux/unistd.h>
32 #include <linux/version.h>
33 #include <asm/system.h>
34 #include <asm/uaccess.h>
37 #include <linux/iobuf.h>
38 #include <linux/stat.h>
39 #include <asm/uaccess.h>
40 #include <asm/segment.h>
42 #include <linux/pagemap.h>
43 #include <linux/smp_lock.h>
45 #define DEBUG_SUBSYSTEM S_LLITE
47 #include <linux/lustre_mds.h>
48 #include <linux/lustre_lite.h>
49 #include "llite_internal.h"
50 #include <linux/lustre_compat25.h>
52 /* called for each page in a completed rpc.*/
53 void ll_ap_completion_24(void *data, int cmd, int rc)
55 struct ll_async_page *llap;
58 llap = llap_from_cookie(data);
64 page = llap->llap_page;
65 LASSERT(PageLocked(page));
68 if (cmd == OBD_BRW_READ) {
69 if (!llap->llap_defer_uptodate)
70 SetPageUptodate(page);
72 llap->llap_write_queued = 0;
78 LL_CDEBUG_PAGE(D_PAGE, page, "io complete, unlocking\n");
82 if (0 && cmd == OBD_BRW_WRITE) {
83 llap_write_complete(page->mapping->host, llap);
84 ll_try_done_writing(page->mapping->host);
87 page_cache_release(page);
90 static int ll_writepage_24(struct page *page)
92 struct inode *inode = page->mapping->host;
93 struct obd_export *exp;
94 struct ll_async_page *llap;
98 LASSERT(!PageDirty(page));
99 LASSERT(PageLocked(page));
101 exp = ll_i2obdexp(inode);
103 GOTO(out, rc = -EINVAL);
105 llap = llap_from_page(page);
107 GOTO(out, rc = PTR_ERR(llap));
109 page_cache_get(page);
110 if (llap->llap_write_queued) {
111 LL_CDEBUG_PAGE(D_PAGE, page, "marking urgent\n");
112 rc = obd_set_async_flags(exp, ll_i2info(inode)->lli_smd, NULL,
114 ASYNC_READY | ASYNC_URGENT);
116 llap->llap_write_queued = 1;
117 rc = obd_queue_async_io(exp, ll_i2info(inode)->lli_smd, NULL,
118 llap->llap_cookie, OBD_BRW_WRITE, 0, 0,
119 0, ASYNC_READY | ASYNC_URGENT);
121 LL_CDEBUG_PAGE(D_PAGE, page, "mmap write queued\n");
123 llap->llap_write_queued = 0;
126 page_cache_release(page);
133 static int ll_direct_IO_24(int rw,
139 struct kiobuf *iobuf, unsigned long blocknr,
143 struct inode *inode = file->f_dentry->d_inode;
145 struct ll_inode_info *lli = ll_i2info(inode);
146 struct lov_stripe_md *lsm = lli->lli_smd;
147 struct brw_page *pga;
148 struct ptlrpc_request_set *set;
150 int length, i, flags, rc = 0;
154 if (!lsm || !lsm->lsm_object_id)
157 /* FIXME: io smaller than PAGE_SIZE is broken on ia64 */
158 if ((iobuf->offset & (PAGE_SIZE - 1)) ||
159 (iobuf->length & (PAGE_SIZE - 1)))
162 set = ptlrpc_prep_set();
166 OBD_ALLOC(pga, sizeof(*pga) * iobuf->nr_pages);
168 ptlrpc_set_destroy(set);
172 flags = 0 /* | OBD_BRW_DIRECTIO */;
173 offset = ((obd_off)blocknr << inode->i_blkbits);
174 length = iobuf->length;
176 for (i = 0, length = iobuf->length; length > 0;
177 length -= pga[i].count, offset += pga[i].count, i++) { /*i last!*/
178 pga[i].pg = iobuf->maplist[i];
180 /* To the end of the page, or the length, whatever is less */
181 pga[i].count = min_t(int, PAGE_SIZE - (offset & ~PAGE_MASK),
185 POISON_PAGE(iobuf->maplist[i], 0x0d);
188 ll_inode_fill_obdo(inode, rw, &oa);
191 lprocfs_counter_add(ll_i2sbi(inode)->ll_stats,
192 LPROC_LL_DIRECT_WRITE, iobuf->length);
194 lprocfs_counter_add(ll_i2sbi(inode)->ll_stats,
195 LPROC_LL_DIRECT_READ, iobuf->length);
196 rc = obd_brw_async(rw == WRITE ? OBD_BRW_WRITE : OBD_BRW_READ,
197 ll_i2obdexp(inode), &oa, lsm, iobuf->nr_pages, pga,
200 CDEBUG(rc == -ENOSPC ? D_INODE : D_ERROR,
201 "error from obd_brw_async: rc = %d\n", rc);
203 rc = ptlrpc_set_wait(set);
205 CERROR("error from callback: rc = %d\n", rc);
207 ptlrpc_set_destroy(set);
210 obdo_to_inode(inode, &oa, OBD_MD_FLBLOCKS);
213 OBD_FREE(pga, sizeof(*pga) * iobuf->nr_pages);
217 struct address_space_operations ll_aops = {
218 readpage: ll_readpage,
219 direct_IO: ll_direct_IO_24,
220 writepage: ll_writepage_24,
221 prepare_write: ll_prepare_write,
222 commit_write: ll_commit_write,
223 removepage: ll_removepage,