fs/xfs/linux-2.6/xfs_fs_subr.c

   1 /*
   2  * Copyright (c) 2000-2002,2005 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
  19 #include "xfs.h"
  20
  21 /*
  22  * Stub for no-op vnode operations that return error status.
  23  */
  24 int
  25 fs_noerr(void)
  26 {
  27         return 0;
  28 }
  29
  30 /*
  31  * Operation unsupported under this file system.
  32  */
  33 int
  34 fs_nosys(void)
  35 {
  36         return ENOSYS;
  37 }
  38
  39 /*
  40  * Stub for inactive, strategy, and read/write lock/unlock.  Does nothing.
  41  */
  42 /* ARGSUSED */
  43 void
  44 fs_noval(void)
  45 {
  46 }
  47
  48 /*
  49  * vnode pcache layer for vnode_tosspages.
  50  * 'last' parameter unused but left in for IRIX compatibility
  51  */
  52 void
  53 fs_tosspages(
  54         bhv_desc_t      *bdp,
  55         xfs_off_t       first,
  56         xfs_off_t       last,
  57         int             fiopt)
  58 {
  59         vnode_t         *vp = BHV_TO_VNODE(bdp);
  60         struct inode    *ip = LINVFS_GET_IP(vp);
  61
  62         if (VN_CACHED(vp))
  63                 truncate_inode_pages(ip->i_mapping, first);
  64 }
  65
  66
  67 /*
  68  * vnode pcache layer for vnode_flushinval_pages.
  69  * 'last' parameter unused but left in for IRIX compatibility
  70  */
  71 void
  72 fs_flushinval_pages(
  73         bhv_desc_t      *bdp,
  74         xfs_off_t       first,
  75         xfs_off_t       last,
  76         int             fiopt)
  77 {
  78         vnode_t         *vp = BHV_TO_VNODE(bdp);
  79         struct inode    *ip = LINVFS_GET_IP(vp);
  80
  81         if (VN_CACHED(vp)) {
  82                 filemap_write_and_wait(ip->i_mapping);
  83
  84                 truncate_inode_pages(ip->i_mapping, first);
  85         }
  86 }
  87
  88 /*
  89  * vnode pcache layer for vnode_flush_pages.
  90  * 'last' parameter unused but left in for IRIX compatibility
  91  */
  92 int
  93 fs_flush_pages(
  94         bhv_desc_t      *bdp,
  95         xfs_off_t       first,
  96         xfs_off_t       last,
  97         uint64_t        flags,
  98         int             fiopt)
  99 {
 100         vnode_t         *vp = BHV_TO_VNODE(bdp);
 101         struct inode    *ip = LINVFS_GET_IP(vp);
 102
 103         if (VN_CACHED(vp)) {
 104                 filemap_fdatawrite(ip->i_mapping);
 105                 if (flags & XFS_B_ASYNC)
 106                         return 0;
 107                 filemap_fdatawait(ip->i_mapping);
 108         }
 109
 110         return 0;
 111 }