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/*
This file is part of gnunet-fuse.
(C) 2012 Christian Grothoff (and other contributing authors)
gnunet-fuse is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
gnunet-fuse is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* readdir.c - FUSE read directory function
*
* Created on: Mar 14, 2012
* Author: MG, Christian Grothoff, Matthias Wachs,
* Krista Bennett, James Blackwell, Igor Wronsky
*
* Read directory
*
* This supersedes the old getdir() interface. New applications
* should use this.
*
* The filesystem may choose between two modes of operation:
*
* 1) The readdir implementation ignores the offset parameter, and
* passes zero to the filler function's offset. The filler
* function will not return '1' (unless an error happens), so the
* whole directory is read in a single readdir operation. This
* works just like the old getdir() method.
*
* 2) The readdir implementation keeps track of the offsets of the
* directory entries. It uses the offset parameter and always
* passes non-zero offset to the filler function. When the buffer
* is full (or an error happens) the filler function will return
* '1'.
*
* Introduced in version 2.3
*/
/**
* @file fuse/readdir.c
* @brief readdir of fuse
* @author Christian Grothoff
*/
#include "gnunet-fuse.h"
#include "gfs_download.h"
/**
* Closure for 'process_directory_entry'.
*/
struct DepContext
{
/**
* Function to call on each entry.
*/
fuse_fill_dir_t filler;
/**
* 'buf' argument to give to filler.
*/
void *buf;
/**
* Basepath to add for the entries.
*/
const char *path;
};
/**
* Function used to process entries in a directory.
*
* @param cls closure
* @param filename name of the file in the directory
* @param uri URI of the file
* @param metadata metadata for the file; metadata for
* the directory if everything else is NULL/zero
* @param length length of the available data for the file
* (of type size_t since data must certainly fit
* into memory; if files are larger than size_t
* permits, then they will certainly not be
* embedded with the directory itself).
* @param data data available for the file (length bytes)
*/
static void
process_directory_entry (void *cls,
const char *filename,
const struct GNUNET_FS_Uri *
uri,
const struct
GNUNET_CONTAINER_MetaData *
meta, size_t length,
const void *data)
{
struct DepContext *dc = cls;
struct GNUNET_FUSE_PathInfo *pi;
char *path;
int is_directory;
if (NULL == filename)
return; /* info about the directory itself */
GNUNET_asprintf (&path,
"%s%s",
dc->path,
filename);
is_directory = GNUNET_FS_meta_data_test_for_directory (meta);
if (GNUNET_SYSERR == is_directory)
is_directory = GNUNET_NO; /* if in doubt, say no */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Listing filename `%s' in directory `%s' (%s)\n",
filename,
dc->path,
path);
pi = GNUNET_FUSE_path_info_create (path, uri, is_directory);
dc->filler (dc->buf,
filename,
&pi->stbuf,
0);
GNUNET_FUSE_path_info_done (pi);
}
int
gn_readdir (const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi)
{
struct GNUNET_FUSE_PathInfo *path_info;
struct DepContext dc;
size_t size;
int ret;
void *data;
struct GNUNET_DISK_MapHandle *mh;
struct GNUNET_DISK_FileHandle *fh;
path_info = GNUNET_FUSE_path_info_get (path);
if (NULL == path_info)
{
/* FIXME: we might need to check which of the ancestors
exist and possibly download ancestral directories,
instead of directly giving up here... */
return - ENOENT;
}
if (NULL == path_info->tmpfile)
{
/* store to temporary file */
path_info->tmpfile = GNUNET_DISK_mktemp ("gnunet-fuse-tempfile");
if (GNUNET_OK != GNUNET_FUSE_download_file (path_info,
0,
GNUNET_FS_uri_chk_get_file_size (path_info->uri)))
{
UNLINK (path_info->tmpfile);
GNUNET_free (path_info->tmpfile);
path_info->tmpfile = NULL;
GNUNET_FUSE_path_info_done (path_info);
return - EIO; /* low level IO error */
}
}
dc.filler = filler;
dc.path = path;
dc.buf = buf;
size = (size_t) GNUNET_FS_uri_chk_get_file_size (path_info->uri);
fh = GNUNET_DISK_file_open (path_info->tmpfile,
GNUNET_DISK_OPEN_READ,
GNUNET_DISK_PERM_NONE);
if (NULL == fh)
{
GNUNET_FUSE_path_info_done (path_info);
return -EBADF;
}
data = GNUNET_DISK_file_map (fh,
&mh,
GNUNET_DISK_MAP_TYPE_READ,
size);
if (NULL == data)
{
GNUNET_assert (GNUNET_OK == GNUNET_DISK_file_close (fh));
GNUNET_FUSE_path_info_done (path_info);
return -EBADF;
}
filler (buf, ".", NULL, 0);
filler (buf, "..", NULL, 0);
ret = 0;
if (GNUNET_OK !=
GNUNET_FS_directory_list_contents (size,
data, 0LL,
&process_directory_entry,
&dc))
ret = - EIO;
GNUNET_assert (GNUNET_OK == GNUNET_DISK_file_unmap (mh));
GNUNET_DISK_file_close (fh);
GNUNET_FUSE_path_info_done (path_info);
return ret;
}
/* end of readdir.c */
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