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         /* can't toss partial tail pages, so mask them out */
  36         last &= ~(PAGE_SIZE - 1);
  37         truncate_inode_pages_range(VFS_I(ip)->i_mapping, first, last - 1);
  38 }
  39
  40 int
  41 xfs_flushinval_pages(
  42         xfs_inode_t     *ip,
  43         xfs_off_t       first,
  44         xfs_off_t       last,
  45         int             fiopt)
  46 {
  47         struct address_space *mapping = VFS_I(ip)->i_mapping;
  48         int             ret = 0;
  49
  50         trace_xfs_pagecache_inval(ip, first, last);
  51
  52         xfs_iflags_clear(ip, XFS_ITRUNCATED);
  53         ret = filemap_write_and_wait_range(mapping, first,
  54                                 last == -1 ? LLONG_MAX : last);
  55         if (!ret)
  56                 truncate_inode_pages_range(mapping, first, last);
  57         return -ret;
  58 }
  59
  60 int
  61 xfs_flush_pages(
  62         xfs_inode_t     *ip,
  63         xfs_off_t       first,
  64         xfs_off_t       last,
  65         uint64_t        flags,
  66         int             fiopt)
  67 {
  68         struct address_space *mapping = VFS_I(ip)->i_mapping;
  69         int             ret = 0;
  70         int             ret2;
  71
  72         xfs_iflags_clear(ip, XFS_ITRUNCATED);
  73         ret = -filemap_fdatawrite_range(mapping, first,
  74                                 last == -1 ? LLONG_MAX : last);
  75         if (flags & XBF_ASYNC)
  76                 return ret;
  77         ret2 = xfs_wait_on_pages(ip, first, last);
  78         if (!ret)
  79                 ret = ret2;
  80         return ret;
  81 }
  82
  83 int
  84 xfs_wait_on_pages(
  85         xfs_inode_t     *ip,
  86         xfs_off_t       first,
  87         xfs_off_t       last)
  88 {
  89         struct address_space *mapping = VFS_I(ip)->i_mapping;
  90
  91         if (mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK)) {
  92                 return -filemap_fdatawait_range(mapping, first,
  93                                         last == -1 ? ip->i_size - 1 : last);
  94         }
  95         return 0;
  96 }