LXR linux/fs/exofs/file.c

   1/*
   2 * Copyright (C) 2005, 2006
   3 * Avishay Traeger (avishay@gmail.com)
   4 * Copyright (C) 2008, 2009
   5 * Boaz Harrosh <bharrosh@panasas.com>
   6 *
   7 * Copyrights for code taken from ext2:
   8 *     Copyright (C) 1992, 1993, 1994, 1995
   9 *     Remy Card (card@masi.ibp.fr)
  10 *     Laboratoire MASI - Institut Blaise Pascal
  11 *     Universite Pierre et Marie Curie (Paris VI)
  12 *     from
  13 *     linux/fs/minix/inode.c
  14 *     Copyright (C) 1991, 1992  Linus Torvalds
  15 *
  16 * This file is part of exofs.
  17 *
  18 * exofs is free software; you can redistribute it and/or modify
  19 * it under the terms of the GNU General Public License as published by
  20 * the Free Software Foundation.  Since it is based on ext2, and the only
  21 * valid version of GPL for the Linux kernel is version 2, the only valid
  22 * version of GPL for exofs is version 2.
  23 *
  24 * exofs is distributed in the hope that it will be useful,
  25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27 * GNU General Public License for more details.
  28 *
  29 * You should have received a copy of the GNU General Public License
  30 * along with exofs; if not, write to the Free Software
  31 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  32 */
  33#include "exofs.h"
  34
  35static int exofs_release_file(struct inode *inode, struct file *filp)
  36{
  37        return 0;
  38}
  39
  40/* exofs_file_fsync - flush the inode to disk
  41 *
  42 *   Note, in exofs all metadata is written as part of inode, regardless.
  43 *   The writeout is synchronous
  44 */
  45static int exofs_file_fsync(struct file *filp, loff_t start, loff_t end,
  46                            int datasync)
  47{
  48        struct inode *inode = filp->f_mapping->host;
  49        int ret;
  50
  51        ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
  52        if (ret)
  53                return ret;
  54
  55        mutex_lock(&inode->i_mutex);
  56        ret = sync_inode_metadata(filp->f_mapping->host, 1);
  57        mutex_unlock(&inode->i_mutex);
  58        return ret;
  59}
  60
  61static int exofs_flush(struct file *file, fl_owner_t id)
  62{
  63        int ret = vfs_fsync(file, 0);
  64        /* TODO: Flush the OSD target */
  65        return ret;
  66}
  67
  68const struct file_operations exofs_file_operations = {
  69        .llseek         = generic_file_llseek,
  70        .read           = do_sync_read,
  71        .write          = do_sync_write,
  72        .aio_read       = generic_file_aio_read,
  73        .aio_write      = generic_file_aio_write,
  74        .mmap           = generic_file_mmap,
  75        .open           = generic_file_open,
  76        .release        = exofs_release_file,
  77        .fsync          = exofs_file_fsync,
  78        .flush          = exofs_flush,
  79        .splice_read    = generic_file_splice_read,
  80        .splice_write   = generic_file_splice_write,
  81};
  82
  83const struct inode_operations exofs_file_inode_operations = {
  84        .setattr        = exofs_setattr,
  85};
  86