fs/exofs/file.c

   1 /*
   2  * Copyright (C) 2005, 2006
   3  * Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
   4  * Copyright (C) 2005, 2006
   5  * International Business Machines
   6  * Copyright (C) 2008, 2009
   7  * Boaz Harrosh <bharrosh@panasas.com>
   8  *
   9  * Copyrights for code taken from ext2:
  10  *     Copyright (C) 1992, 1993, 1994, 1995
  11  *     Remy Card (card@masi.ibp.fr)
  12  *     Laboratoire MASI - Institut Blaise Pascal
  13  *     Universite Pierre et Marie Curie (Paris VI)
  14  *     from
  15  *     linux/fs/minix/inode.c
  16  *     Copyright (C) 1991, 1992  Linus Torvalds
  17  *
  18  * This file is part of exofs.
  19  *
  20  * exofs is free software; you can redistribute it and/or modify
  21  * it under the terms of the GNU General Public License as published by
  22  * the Free Software Foundation.  Since it is based on ext2, and the only
  23  * valid version of GPL for the Linux kernel is version 2, the only valid
  24  * version of GPL for exofs is version 2.
  25  *
  26  * exofs is distributed in the hope that it will be useful,
  27  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  28  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  29  * GNU General Public License for more details.
  30  *
  31  * You should have received a copy of the GNU General Public License
  32  * along with exofs; if not, write to the Free Software
  33  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  34  */
  35
  36 #include <linux/buffer_head.h>
  37
  38 #include "exofs.h"
  39
  40 static int exofs_release_file(struct inode *inode, struct file *filp)
  41 {
  42         return 0;
  43 }
  44
  45 static int exofs_file_fsync(struct file *filp, struct dentry *dentry,
  46                             int datasync)
  47 {
  48         int ret;
  49         struct address_space *mapping = filp->f_mapping;
  50
  51         ret = filemap_write_and_wait(mapping);
  52         if (ret)
  53                 return ret;
  54
  55         /*Note: file_fsync below also calles sync_blockdev, which is a no-op
  56          *      for exofs, but other then that it does sync_inode and
  57          *      sync_superblock which is what we need here.
  58          */
  59         return file_fsync(filp, dentry, datasync);
  60 }
  61
  62 static int exofs_flush(struct file *file, fl_owner_t id)
  63 {
  64         exofs_file_fsync(file, file->f_path.dentry, 1);
  65         /* TODO: Flush the OSD target */
  66         return 0;
  67 }
  68
  69 const struct file_operations exofs_file_operations = {
  70         .llseek         = generic_file_llseek,
  71         .read           = do_sync_read,
  72         .write          = do_sync_write,
  73         .aio_read       = generic_file_aio_read,
  74         .aio_write      = generic_file_aio_write,
  75         .mmap           = generic_file_mmap,
  76         .open           = generic_file_open,
  77         .release        = exofs_release_file,
  78         .fsync          = exofs_file_fsync,
  79         .flush          = exofs_flush,
  80         .splice_read    = generic_file_splice_read,
  81         .splice_write   = generic_file_splice_write,
  82 };
  83
  84 const struct inode_operations exofs_file_inode_operations = {
  85         .truncate       = exofs_truncate,
  86         .setattr        = exofs_setattr,
  87 };