release/src-rt-6.x.4708/linux/linux-2.6.36/fs/xfs/linux-2.6/xfs_fs_subr.c

   1 /*
   2  * Copyright (c) 2000-2002,2005-2006 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_vnodeops.h"
  20 #include "xfs_bmap_btree.h"
  21 #include "xfs_inode.h"
  22 #include "xfs_trace.h"
  23
  24 /*
  25  * note: all filemap functions return negative error codes. These
  26  * need to be inverted before returning to the xfs core functions.
  27  */
  28 void
  29 xfs_tosspages(
  30         xfs_inode_t     *ip,
  31         xfs_off_t       first,
  32         xfs_off_t       last,
  33         int             fiopt)
  34 {
  35         struct address_space *mapping = VFS_I(ip)->i_mapping;
  36
  37         if (mapping->nrpages)
  38                 truncate_inode_pages(mapping, first);
  39 }
  40
  41 int
  42 xfs_flushinval_pages(
  43         xfs_inode_t     *ip,
  44         xfs_off_t       first,
  45         xfs_off_t       last,
  46         int             fiopt)
  47 {
  48         struct address_space *mapping = VFS_I(ip)->i_mapping;
  49         int             ret = 0;
  50
  51         trace_xfs_pagecache_inval(ip, first, last);
  52
  53         if (mapping->nrpages) {
  54                 xfs_iflags_clear(ip, XFS_ITRUNCATED);
  55                 ret = filemap_write_and_wait(mapping);
  56                 if (!ret)
  57                         truncate_inode_pages(mapping, first);
  58         }
  59         return -ret;
  60 }
  61
  62 int
  63 xfs_flush_pages(
  64         xfs_inode_t     *ip,
  65         xfs_off_t       first,
  66         xfs_off_t       last,
  67         uint64_t        flags,
  68         int             fiopt)
  69 {
  70         struct address_space *mapping = VFS_I(ip)->i_mapping;
  71         int             ret = 0;
  72         int             ret2;
  73
  74         if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
  75                 xfs_iflags_clear(ip, XFS_ITRUNCATED);
  76                 ret = -filemap_fdatawrite(mapping);
  77         }
  78         if (flags & XBF_ASYNC)
  79                 return ret;
  80         ret2 = xfs_wait_on_pages(ip, first, last);
  81         if (!ret)
  82                 ret = ret2;
  83         return ret;
  84 }
  85
  86 int
  87 xfs_wait_on_pages(
  88         xfs_inode_t     *ip,
  89         xfs_off_t       first,
  90         xfs_off_t       last)
  91 {
  92         struct address_space *mapping = VFS_I(ip)->i_mapping;
  93
  94         if (mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK))
  95                 return -filemap_fdatawait(mapping);
  96         return 0;
  97 }