--- /dev/null
+/*
+ * 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"
+
+static int compare_dirent (const void *a, const void *b) {
+ const SMB_STRUCT_DIRENT *da = (const SMB_STRUCT_DIRENT *) a;
+ const SMB_STRUCT_DIRENT *db = (const SMB_STRUCT_DIRENT *) b;
+ return strcmp(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 void 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);
+
+ 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));
+ 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;
+ qsort(data->directory_list, data->number_of_entries,
+ sizeof(SMB_STRUCT_DIRENT), compare_dirent);
+}
+
+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));
+
+ 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);
+
+ open_and_sort_dir(handle);
+
+ return data->source_directory;
+}
+
+static SMB_STRUCT_DIRENT *dirsort_readdir(vfs_handle_struct *handle,
+ SMB_STRUCT_DIR *dirp)
+{
+ 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;
+}
+
+/* VFS operations structure */
+
+static vfs_op_tuple dirsort_op_tuples[] = {
+
+ /* Directory operations */
+
+ {SMB_VFS_OP(dirsort_opendir), SMB_VFS_OP_OPENDIR,
+ SMB_VFS_LAYER_TRANSPARENT},
+ {SMB_VFS_OP(dirsort_readdir), SMB_VFS_OP_READDIR,
+ SMB_VFS_LAYER_TRANSPARENT},
+ {SMB_VFS_OP(dirsort_seekdir), SMB_VFS_OP_SEEKDIR,
+ SMB_VFS_LAYER_TRANSPARENT},
+ {SMB_VFS_OP(dirsort_telldir), SMB_VFS_OP_TELLDIR,
+ SMB_VFS_LAYER_TRANSPARENT},
+ {SMB_VFS_OP(dirsort_rewinddir), SMB_VFS_OP_REWINDDIR,
+ SMB_VFS_LAYER_TRANSPARENT},
+
+ {NULL, SMB_VFS_OP_NOOP,
+ SMB_VFS_LAYER_NOOP}
+};
+
+NTSTATUS vfs_dirsort_init(void)
+{
+ return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "dirsort",
+ dirsort_op_tuples);
+}
git.samba.org / samba.git / commitdiff