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
  23 int  fs_noerr(void) { return 0; }
  24 int  fs_nosys(void) { return ENOSYS; }
  25 void fs_noval(void) { return; }
  26
  27 /*
  28  * note: all filemap functions return negative error codes. These
  29  * need to be inverted before returning to the xfs core functions.
  30  */
  31 void
  32 xfs_tosspages(
  33         xfs_inode_t     *ip,
  34         xfs_off_t       first,
  35         xfs_off_t       last,
  36         int             fiopt)
  37 {
  38         struct address_space *mapping = VFS_I(ip)->i_mapping;
  39
  40         if (mapping->nrpages)
  41                 truncate_inode_pages(mapping, first);
  42 }
  43
  44 int
  45 xfs_flushinval_pages(
  46         xfs_inode_t     *ip,
  47         xfs_off_t       first,
  48         xfs_off_t       last,
  49         int             fiopt)
  50 {
  51         struct address_space *mapping = VFS_I(ip)->i_mapping;
  52         int             ret = 0;
  53
  54         if (mapping->nrpages) {
  55                 xfs_iflags_clear(ip, XFS_ITRUNCATED);
  56                 ret = filemap_write_and_wait(mapping);
  57                 if (!ret)
  58                         truncate_inode_pages(mapping, first);
  59         }
  60         return -ret;
  61 }
  62
  63 int
  64 xfs_flush_pages(
  65         xfs_inode_t     *ip,
  66         xfs_off_t       first,
  67         xfs_off_t       last,
  68         uint64_t        flags,
  69         int             fiopt)
  70 {
  71         struct address_space *mapping = VFS_I(ip)->i_mapping;
  72         int             ret = 0;
  73         int             ret2;
  74
  75         if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
  76                 xfs_iflags_clear(ip, XFS_ITRUNCATED);
  77                 ret = filemap_fdatawrite(mapping);
  78                 if (flags & XFS_B_ASYNC)
  79                         return -ret;
  80                 ret2 = filemap_fdatawait(mapping);
  81                 if (!ret)
  82                         ret = ret2;
  83         }
  84         return -ret;
  85 }
  86
  87 int
  88 xfs_wait_on_pages(
  89         xfs_inode_t     *ip,
  90         xfs_off_t       first,
  91         xfs_off_t       last)
  92 {
  93         struct address_space *mapping = VFS_I(ip)->i_mapping;
  94
  95         if (mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK))
  96                 return -filemap_fdatawait(mapping);
  97         return 0;
  98 }