fs/pohmelfs/file.c

   1 /*
   2  * Copyright (C) 2011+ Evgeniy Polyakov <zbr@ioremap.net>
   3  */
   4
   5 #include <linux/fs.h>
   6
   7 #include "pohmelfs.h"
   8
   9 static int pohmelfs_send_prepare_commit(struct pohmelfs_inode *pi, size_t len, loff_t pos, int prepare)
  10 {
  11         struct pohmelfs_io io;
  12
  13         memset(&io, 0, sizeof(struct pohmelfs_io));
  14
  15         io.pi = pi;
  16         io.id = &pi->id;
  17         io.group = 2;
  18         io.cmd = DNET_CMD_WRITE;
  19         io.offset = pos;
  20         io.num = len + pos;
  21         io.aflags = DNET_ATTR_NOCSUM;
  22         if (prepare)
  23                 io.ioflags = DNET_IO_FLAGS_PREPARE;
  24         else
  25                 io.ioflags = DNET_IO_FLAGS_COMMIT;
  26         io.ioflags |= DNET_IO_FLAGS_PLAIN_WRITE;
  27
  28         return pohmelfs_send_io(&io);
  29 }
  30
  31 static ssize_t pohmelfs_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
  32 {
  33         ssize_t err;
  34 #if 0
  35         struct inode *inode = filp->f_mapping->host;
  36         struct pohmelfs_inode *pi = pohmelfs_inode(inode);
  37         loff_t offset = *ppos;
  38         err = pohmelfs_send_prepare_commit(pi, len, offset, 1);
  39         if (err)
  40                 goto err_out_exit;
  41 #endif
  42         err = do_sync_write(filp, buf, len, ppos);
  43 #if 0
  44         pohmelfs_send_prepare_commit(pi, 0, 0, 0);
  45 #endif
  46 err_out_exit:
  47         return err;
  48 }
  49
  50 const struct file_operations pohmelfs_file_ops = {
  51         .open           = generic_file_open,
  52
  53         .llseek         = generic_file_llseek,
  54
  55         .read           = do_sync_read,
  56         .aio_read       = generic_file_aio_read,
  57
  58         .mmap           = generic_file_mmap,
  59
  60         .splice_read    = generic_file_splice_read,
  61         .splice_write   = generic_file_splice_write,
  62
  63         .write          = pohmelfs_write,
  64         .aio_write      = generic_file_aio_write,
  65 };
  66
  67 const struct inode_operations pohmelfs_file_inode_operations = {
  68 };