drivers/staging/lustre/lustre/obdclass/linux/linux-obdo.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2012, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/obdclass/linux/linux-obdo.c
  33  *
  34  * Object Devices Class Driver
  35  * These are the only exported functions, they provide some generic
  36  * infrastructure for managing object devices
  37  */
  38
  39 #define DEBUG_SUBSYSTEM S_CLASS
  40
  41 #include <linux/module.h>
  42 #include "../../include/obd_class.h"
  43 #include "../../include/lustre/lustre_idl.h"
  44
  45 #include <linux/fs.h>
  46
  47 void obdo_refresh_inode(struct inode *dst, struct obdo *src, u32 valid)
  48 {
  49         valid &= src->o_valid;
  50
  51         if (valid & (OBD_MD_FLCTIME | OBD_MD_FLMTIME))
  52                 CDEBUG(D_INODE,
  53                        "valid %#llx, cur time %lu/%lu, new %llu/%llu\n",
  54                        src->o_valid, LTIME_S(dst->i_mtime),
  55                        LTIME_S(dst->i_ctime), src->o_mtime, src->o_ctime);
  56
  57         if (valid & OBD_MD_FLATIME && src->o_atime > LTIME_S(dst->i_atime))
  58                 LTIME_S(dst->i_atime) = src->o_atime;
  59         if (valid & OBD_MD_FLMTIME && src->o_mtime > LTIME_S(dst->i_mtime))
  60                 LTIME_S(dst->i_mtime) = src->o_mtime;
  61         if (valid & OBD_MD_FLCTIME && src->o_ctime > LTIME_S(dst->i_ctime))
  62                 LTIME_S(dst->i_ctime) = src->o_ctime;
  63         if (valid & OBD_MD_FLSIZE)
  64                 i_size_write(dst, src->o_size);
  65         /* optimum IO size */
  66         if (valid & OBD_MD_FLBLKSZ && src->o_blksize > (1 << dst->i_blkbits))
  67                 dst->i_blkbits = ffs(src->o_blksize) - 1;
  68
  69         if (dst->i_blkbits < PAGE_SHIFT)
  70                 dst->i_blkbits = PAGE_SHIFT;
  71
  72         /* allocation of space */
  73         if (valid & OBD_MD_FLBLOCKS && src->o_blocks > dst->i_blocks)
  74                 /*
  75                  * XXX shouldn't overflow be checked here like in
  76                  * obdo_to_inode().
  77                  */
  78                 dst->i_blocks = src->o_blocks;
  79 }
  80 EXPORT_SYMBOL(obdo_refresh_inode);