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 /* called for each page in a completed rpc.*/
  55 void ll_ap_completion_26(void *data, int cmd, int rc)
  56 {
  57         struct ll_async_page *llap;
  58         struct page *page;
  59
  60         llap = llap_from_cookie(data);
  61         if (IS_ERR(llap)) {
  62                 EXIT;
  63                 return;
  64         }
  65
  66         page = llap->llap_page;
  67         LASSERT(PageLocked(page));
  68
  69         if (rc == 0)  {
  70                 if (cmd == OBD_BRW_READ) {
  71                         if (!llap->llap_defer_uptodate)
  72                                 SetPageUptodate(page);
  73                 } else {
  74                         llap->llap_write_queued = 0;
  75                 }
  76         } else {
  77                 SetPageError(page);
  78         }
  79
  80         LL_CDEBUG_PAGE(D_PAGE, page, "io complete, unlocking\n");
  81
  82         unlock_page(page);
  83
  84         if (0 && cmd == OBD_BRW_WRITE) {
  85                 llap_write_complete(page->mapping->host, llap);
  86                 ll_try_done_writing(page->mapping->host);
  87         }
  88
  89         page_cache_release(page);
  90 }
  91
  92 static int ll_writepage_26(struct page *page, struct writeback_control *wbc)
  93 {
  94         struct inode *inode = page->mapping->host;
  95         struct obd_export *exp;
  96         struct ll_async_page *llap;
  97         int rc;
  98         ENTRY;
  99
 100         LASSERT(!PageDirty(page));
 101         LASSERT(PageLocked(page));
 102
 103         exp = ll_i2obdexp(inode);
 104         if (exp == NULL)
 105                 GOTO(out, rc = -EINVAL);
 106
 107         llap = llap_from_page(page);
 108         if (IS_ERR(llap))
 109                 GOTO(out, rc = PTR_ERR(llap));
 110
 111         page_cache_get(page);
 112         if (llap->llap_write_queued) {
 113                 LL_CDEBUG_PAGE(D_PAGE, page, "marking urgent\n");
 114                 rc = obd_set_async_flags(exp, ll_i2info(inode)->lli_smd, NULL,
 115                                          llap->llap_cookie,
 116                                          ASYNC_READY | ASYNC_URGENT);
 117         } else {
 118                 llap->llap_write_queued = 1;
 119                 rc = obd_queue_async_io(exp, ll_i2info(inode)->lli_smd, NULL,
 120                                         llap->llap_cookie, OBD_BRW_WRITE, 0, 0,
 121                                         0, ASYNC_READY | ASYNC_URGENT);
 122                 if (rc == 0)
 123                         LL_CDEBUG_PAGE(D_PAGE, page, "mmap write queued\n");
 124                 else
 125                         llap->llap_write_queued = 0;
 126         }
 127         if (rc)
 128                 page_cache_release(page);
 129 out:
 130         if (rc)
 131                 unlock_page(page);
 132         RETURN(rc);
 133 }
 134
 135 struct address_space_operations ll_aops = {
 136         readpage: ll_readpage,
 137 //        readpages: ll_readpages,
 138 //        direct_IO: ll_direct_IO_26,
 139         writepage: ll_writepage_26,
 140         writepages: generic_writepages,
 141         set_page_dirty: __set_page_dirty_nobuffers,
 142         sync_page: NULL,
 143         prepare_write: ll_prepare_write,
 144         commit_write: ll_commit_write,
 145         removepage: ll_removepage,
 146         bmap: NULL
 147 };