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 int  fs_noerr(void) { return 0; }
  25 int  fs_nosys(void) { return ENOSYS; }
  26 void fs_noval(void) { return; }
  27
  28 /*
  29  * note: all filemap functions return negative error codes. These
  30  * need to be inverted before returning to the xfs core functions.
  31  */
  32 void
  33 xfs_tosspages(
  34         xfs_inode_t     *ip,
  35         xfs_off_t       first,
  36         xfs_off_t       last,
  37         int             fiopt)
  38 {
  39         struct address_space *mapping = VFS_I(ip)->i_mapping;
  40
  41         if (mapping->nrpages)
  42                 truncate_inode_pages(mapping, first);
  43 }
  44
  45 int
  46 xfs_flushinval_pages(
  47         xfs_inode_t     *ip,
  48         xfs_off_t       first,
  49         xfs_off_t       last,
  50         int             fiopt)
  51 {
  52         struct address_space *mapping = VFS_I(ip)->i_mapping;
  53         int             ret = 0;
  54
  55         trace_xfs_pagecache_inval(ip, first, last);
  56
  57         if (mapping->nrpages) {
  58                 xfs_iflags_clear(ip, XFS_ITRUNCATED);
  59                 ret = filemap_write_and_wait(mapping);
  60                 if (!ret)
  61                         truncate_inode_pages(mapping, first);
  62         }
  63         return -ret;
  64 }
  65
  66 int
  67 xfs_flush_pages(
  68         xfs_inode_t     *ip,
  69         xfs_off_t       first,
  70         xfs_off_t       last,
  71         uint64_t        flags,
  72         int             fiopt)
  73 {
  74         struct address_space *mapping = VFS_I(ip)->i_mapping;
  75         int             ret = 0;
  76         int             ret2;
  77
  78         if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
  79                 xfs_iflags_clear(ip, XFS_ITRUNCATED);
  80                 ret = -filemap_fdatawrite(mapping);
  81         }
  82         if (flags & XFS_B_ASYNC)
  83                 return ret;
  84         ret2 = xfs_wait_on_pages(ip, first, last);
  85         if (!ret)
  86                 ret = ret2;
  87         return ret;
  88 }
  89
  90 int
  91 xfs_wait_on_pages(
  92         xfs_inode_t     *ip,
  93         xfs_off_t       first,
  94         xfs_off_t       last)
  95 {
  96         struct address_space *mapping = VFS_I(ip)->i_mapping;
  97
  98         if (mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK))
  99                 return -filemap_fdatawait(mapping);
 100         return 0;
 101 }