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/*
* VFS module to provide a sorted directory list.
*
* Copyright (C) Andy Kelk (andy@mopoke.co.uk), 2009
*
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "system/filesys.h"
static int compare_dirent (const SMB_STRUCT_DIRENT *da, const SMB_STRUCT_DIRENT *db)
{
return StrCaseCmp(da->d_name, db->d_name);
}
struct dirsort_privates {
long pos;
SMB_STRUCT_DIRENT *directory_list;
long number_of_entries;
time_t mtime;
SMB_STRUCT_DIR *source_directory;
int fd;
};
static void free_dirsort_privates(void **datap) {
struct dirsort_privates *data = (struct dirsort_privates *) *datap;
SAFE_FREE(data->directory_list);
SAFE_FREE(data);
*datap = NULL;
return;
}
static bool open_and_sort_dir (vfs_handle_struct *handle)
{
SMB_STRUCT_DIRENT *dp;
struct stat dir_stat;
long current_pos;
struct dirsort_privates *data = NULL;
SMB_VFS_HANDLE_GET_DATA(handle, data, struct dirsort_privates,
return false);
data->number_of_entries = 0;
if (fstat(data->fd, &dir_stat) == 0) {
data->mtime = dir_stat.st_mtime;
}
while (SMB_VFS_NEXT_READDIR(handle, data->source_directory, NULL)
!= NULL) {
data->number_of_entries++;
}
/* Open the underlying directory and count the number of entries
Skip back to the beginning as we'll read it again */
SMB_VFS_NEXT_REWINDDIR(handle, data->source_directory);
/* Set up an array and read the directory entries into it */
SAFE_FREE(data->directory_list); /* destroy previous cache if needed */
data->directory_list = (SMB_STRUCT_DIRENT *)SMB_MALLOC(
data->number_of_entries * sizeof(SMB_STRUCT_DIRENT));
if (!data->directory_list) {
return false;
}
current_pos = data->pos;
data->pos = 0;
while ((dp = SMB_VFS_NEXT_READDIR(handle, data->source_directory,
NULL)) != NULL) {
data->directory_list[data->pos++] = *dp;
}
/* Sort the directory entries by name */
data->pos = current_pos;
TYPESAFE_QSORT(data->directory_list, data->number_of_entries, compare_dirent);
return true;
}
static SMB_STRUCT_DIR *dirsort_opendir(vfs_handle_struct *handle,
const char *fname, const char *mask,
uint32 attr)
{
struct dirsort_privates *data = NULL;
/* set up our private data about this directory */
data = (struct dirsort_privates *)SMB_MALLOC(
sizeof(struct dirsort_privates));
if (!data) {
return NULL;
}
data->directory_list = NULL;
data->pos = 0;
/* Open the underlying directory and count the number of entries */
data->source_directory = SMB_VFS_NEXT_OPENDIR(handle, fname, mask,
attr);
data->fd = dirfd(data->source_directory);
SMB_VFS_HANDLE_SET_DATA(handle, data, free_dirsort_privates,
struct dirsort_privates, return NULL);
if (!open_and_sort_dir(handle)) {
SMB_VFS_NEXT_CLOSEDIR(handle,data->source_directory);
return NULL;
}
return data->source_directory;
}
static SMB_STRUCT_DIR *dirsort_fdopendir(vfs_handle_struct *handle,
files_struct *fsp,
const char *mask,
uint32 attr)
{
struct dirsort_privates *data = NULL;
/* set up our private data about this directory */
data = (struct dirsort_privates *)SMB_MALLOC(
sizeof(struct dirsort_privates));
if (!data) {
return NULL;
}
data->directory_list = NULL;
data->pos = 0;
/* Open the underlying directory and count the number of entries */
data->source_directory = SMB_VFS_NEXT_FDOPENDIR(handle, fsp, mask,
attr);
if (data->source_directory == NULL) {
SAFE_FREE(data);
return NULL;
}
data->fd = dirfd(data->source_directory);
SMB_VFS_HANDLE_SET_DATA(handle, data, free_dirsort_privates,
struct dirsort_privates, return NULL);
if (!open_and_sort_dir(handle)) {
SMB_VFS_NEXT_CLOSEDIR(handle,data->source_directory);
/* fd is now closed. */
fsp->fh->fd = -1;
return NULL;
}
return data->source_directory;
}
static SMB_STRUCT_DIRENT *dirsort_readdir(vfs_handle_struct *handle,
SMB_STRUCT_DIR *dirp,
SMB_STRUCT_STAT *sbuf)
{
struct dirsort_privates *data = NULL;
time_t current_mtime;
struct stat dir_stat;
SMB_VFS_HANDLE_GET_DATA(handle, data, struct dirsort_privates,
return NULL);
if (fstat(data->fd, &dir_stat) == -1) {
return NULL;
}
current_mtime = dir_stat.st_mtime;
/* throw away cache and re-read the directory if we've changed */
if (current_mtime > data->mtime) {
open_and_sort_dir(handle);
}
if (data->pos >= data->number_of_entries) {
return NULL;
}
return &data->directory_list[data->pos++];
}
static void dirsort_seekdir(vfs_handle_struct *handle, SMB_STRUCT_DIR *dirp,
long offset)
{
struct dirsort_privates *data = NULL;
SMB_VFS_HANDLE_GET_DATA(handle, data, struct dirsort_privates, return);
data->pos = offset;
}
static long dirsort_telldir(vfs_handle_struct *handle, SMB_STRUCT_DIR *dirp)
{
struct dirsort_privates *data = NULL;
SMB_VFS_HANDLE_GET_DATA(handle, data, struct dirsort_privates,
return -1);
return data->pos;
}
static void dirsort_rewinddir(vfs_handle_struct *handle, SMB_STRUCT_DIR *dirp)
{
struct dirsort_privates *data = NULL;
SMB_VFS_HANDLE_GET_DATA(handle, data, struct dirsort_privates, return);
data->pos = 0;
}
static struct vfs_fn_pointers vfs_dirsort_fns = {
.opendir = dirsort_opendir,
.fdopendir = dirsort_fdopendir,
.readdir = dirsort_readdir,
.seekdir = dirsort_seekdir,
.telldir = dirsort_telldir,
.rewind_dir = dirsort_rewinddir,
};
NTSTATUS vfs_dirsort_init(void)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "dirsort",
&vfs_dirsort_fns);
}
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