1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/libfsserver/lib/files/client_file_accessor.cc Sun Apr 18 22:32:54 2021 +0200
1.3 @@ -0,0 +1,108 @@
1.4 +/*
1.5 + * A file accessor using the filesystem client interface.
1.6 + *
1.7 + * Copyright (C) 2021 Paul Boddie <paul@boddie.org.uk>
1.8 + *
1.9 + * This program is free software; you can redistribute it and/or
1.10 + * modify it under the terms of the GNU General Public License as
1.11 + * published by the Free Software Foundation; either version 2 of
1.12 + * the License, or (at your option) any later version.
1.13 + *
1.14 + * This program is distributed in the hope that it will be useful,
1.15 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.16 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.17 + * GNU General Public License for more details.
1.18 + *
1.19 + * You should have received a copy of the GNU General Public License
1.20 + * along with this program; if not, write to the Free Software
1.21 + * Foundation, Inc., 51 Franklin Street, Fifth Floor,
1.22 + * Boston, MA 02110-1301, USA
1.23 + */
1.24 +
1.25 +#include <stdio.h>
1.26 +#include <string.h>
1.27 +
1.28 +#include <algorithm>
1.29 +
1.30 +#include <fsclient/client.h>
1.31 +#include <systypes/fcntl.h>
1.32 +
1.33 +#include "client_file_accessor.h"
1.34 +
1.35 +
1.36 +
1.37 +ClientFileAccessor::ClientFileAccessor(const char *path, fileid_t fileid)
1.38 +: Accessor(fileid), _path(path)
1.39 +{
1.40 +}
1.41 +
1.42 +/* Return the size of the file. */
1.43 +
1.44 +offset_t ClientFileAccessor::get_size()
1.45 +{
1.46 + return _file->size;
1.47 +}
1.48 +
1.49 +/* Update the size of the file. */
1.50 +
1.51 +void ClientFileAccessor::set_size(offset_t size)
1.52 +{
1.53 + file_resize(_file, size);
1.54 +}
1.55 +
1.56 +/* Perform any closing operation on the file. */
1.57 +
1.58 +void ClientFileAccessor::close()
1.59 +{
1.60 + client_close(_file);
1.61 +}
1.62 +
1.63 +/* Perform any opening operation on the file. */
1.64 +
1.65 +void ClientFileAccessor::open()
1.66 +{
1.67 + _file = client_open(_path, O_RDWR);
1.68 +}
1.69 +
1.70 +/* Data transfer helper methods. */
1.71 +
1.72 +/* Fill the populated portion of a flexpage. */
1.73 +
1.74 +void ClientFileAccessor::fill_populated(Flexpage *flexpage)
1.75 +{
1.76 + offset_t filepos = flexpage->base_offset;
1.77 + offset_t addr = flexpage->base_addr;
1.78 +
1.79 + /* Tag the region with file state. */
1.80 +
1.81 + flexpage->region->fill(fileid, filepos);
1.82 +
1.83 + /* Fill the region with file content. */
1.84 +
1.85 + client_seek(_file, filepos, SEEK_SET);
1.86 + offset_t nread = client_read(_file, (char *) addr, flexpage->size);
1.87 +
1.88 + /* Pad the flexpage with zero. */
1.89 +
1.90 + memset((void *) (addr + nread), 0, flexpage->size - nread);
1.91 +}
1.92 +
1.93 +/* Flush the populated portion of a flexpage. */
1.94 +
1.95 +void ClientFileAccessor::flush_populated(Flexpage *flexpage)
1.96 +{
1.97 + offset_t filepos = flexpage->base_offset;
1.98 + offset_t addr = flexpage->base_addr;
1.99 + offset_t populated_size = std::min(flexpage->size, get_size() - filepos);
1.100 +
1.101 + /* Remove the file state tag from the region. */
1.102 +
1.103 + flexpage->region->flush();
1.104 +
1.105 + /* Copy the populated region to the file. */
1.106 +
1.107 + client_seek(_file, filepos, SEEK_SET);
1.108 + client_write(_file, (char *) addr, populated_size);
1.109 +}
1.110 +
1.111 +// vim: tabstop=4 expandtab shiftwidth=4