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[fs/lustre-release.git] / lustre / llite / rw26.c
1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=8:tabstop=8:
3  *
4  * Lustre Lite I/O page cache routines for the 2.5/2.6 kernel version
5  *
6  *  Copyright (c) 2001-2003 Cluster File Systems, Inc.
7  *
8  *   This file is part of Lustre, http://www.lustre.org.
9  *
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.
13  *
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.
18  *
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.
22  */
23
24 #include <linux/config.h>
25 #include <linux/kernel.h>
26 #include <linux/mm.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>
35
36 #include <linux/fs.h>
37 #include <linux/buffer_head.h>
38 #include <linux/mpage.h>
39 #include <linux/writeback.h>
40 #include <linux/stat.h>
41 #include <asm/uaccess.h>
42 #include <asm/segment.h>
43 #include <linux/mm.h>
44 #include <linux/pagemap.h>
45 #include <linux/smp_lock.h>
46
47 #define DEBUG_SUBSYSTEM S_LLITE
48
49 #include <linux/lustre_mds.h>
50 #include <linux/lustre_lite.h>
51 #include "llite_internal.h"
52 #include <linux/lustre_compat25.h>
53
54 static int ll_writepage_26(struct page *page, struct writeback_control *wbc)
55 {
56         struct inode *inode = page->mapping->host;
57         struct obd_export *exp;
58         struct ll_async_page *llap;
59         int rc;
60         ENTRY;
61
62         LASSERT(!PageDirty(page));
63         LASSERT(PageLocked(page));
64
65         exp = ll_i2obdexp(inode);
66         if (exp == NULL)
67                 GOTO(out, rc = -EINVAL);
68
69         llap = llap_from_page(page);
70         if (IS_ERR(llap))
71                 GOTO(out, rc = PTR_ERR(llap));
72
73         page_cache_get(page);
74         if (llap->llap_write_queued) {
75                 LL_CDEBUG_PAGE(D_PAGE, page, "marking urgent\n");
76                 rc = obd_set_async_flags(exp, ll_i2info(inode)->lli_smd, NULL,
77                                          llap->llap_cookie,
78                                          ASYNC_READY | ASYNC_URGENT);
79         } else {
80                 llap->llap_write_queued = 1;
81                 rc = obd_queue_async_io(exp, ll_i2info(inode)->lli_smd, NULL,
82                                         llap->llap_cookie, OBD_BRW_WRITE, 0, 0,
83                                         0, ASYNC_READY | ASYNC_URGENT);
84                 if (rc == 0)
85                         LL_CDEBUG_PAGE(D_PAGE, page, "mmap write queued\n");
86                 else
87                         llap->llap_write_queued = 0;
88         }
89         if (rc)
90                 page_cache_release(page);
91 out:
92         if (rc)
93                 unlock_page(page);
94         RETURN(rc);
95 }
96
97 struct address_space_operations ll_aops = {
98         .readpage       = ll_readpage,
99 //        .readpages      = ll_readpages,
100 //        .direct_IO      = ll_direct_IO_26,
101         .writepage      = ll_writepage_26,
102         .writepages     = generic_writepages,
103         .set_page_dirty = __set_page_dirty_nobuffers,
104         .sync_page      = NULL,
105         .prepare_write  = ll_prepare_write,
106         .commit_write   = ll_commit_write,
107         .removepage     = ll_removepage,
108         .bmap           = NULL
109 };