2 * VFS module to provide a sorted directory list.
4 * Copyright (C) Andy Kelk (andy@mopoke.co.uk), 2009
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, see <http://www.gnu.org/licenses/>.
22 #include "smbd/smbd.h"
23 #include "system/filesys.h"
25 static int compare_dirent (const SMB_STRUCT_DIRENT
*da
, const SMB_STRUCT_DIRENT
*db
)
27 return StrCaseCmp(da
->d_name
, db
->d_name
);
30 struct dirsort_privates
{
32 SMB_STRUCT_DIRENT
*directory_list
;
33 long number_of_entries
;
35 SMB_STRUCT_DIR
*source_directory
;
39 static void free_dirsort_privates(void **datap
) {
43 static bool open_and_sort_dir (vfs_handle_struct
*handle
)
45 SMB_STRUCT_DIRENT
*dp
;
48 struct dirsort_privates
*data
= NULL
;
50 SMB_VFS_HANDLE_GET_DATA(handle
, data
, struct dirsort_privates
,
53 data
->number_of_entries
= 0;
55 if (fstat(data
->fd
, &dir_stat
) == 0) {
56 data
->mtime
= dir_stat
.st_mtime
;
59 while (SMB_VFS_NEXT_READDIR(handle
, data
->source_directory
, NULL
)
61 data
->number_of_entries
++;
64 if (data
->number_of_entries
== 0) {
68 /* Open the underlying directory and count the number of entries
69 Skip back to the beginning as we'll read it again */
70 SMB_VFS_NEXT_REWINDDIR(handle
, data
->source_directory
);
72 /* Set up an array and read the directory entries into it */
73 TALLOC_FREE(data
->directory_list
); /* destroy previous cache if needed */
74 data
->directory_list
= talloc_zero_array(data
,
76 data
->number_of_entries
);
77 if (!data
->directory_list
) {
81 while ((dp
= SMB_VFS_NEXT_READDIR(handle
, data
->source_directory
,
83 data
->directory_list
[i
++] = *dp
;
86 /* Sort the directory entries by name */
87 TYPESAFE_QSORT(data
->directory_list
, data
->number_of_entries
, compare_dirent
);
91 static SMB_STRUCT_DIR
*dirsort_opendir(vfs_handle_struct
*handle
,
92 const char *fname
, const char *mask
,
95 struct dirsort_privates
*data
= NULL
;
97 /* set up our private data about this directory */
98 data
= talloc_zero(handle
->conn
, struct dirsort_privates
);
103 data
->directory_list
= NULL
;
106 /* Open the underlying directory and count the number of entries */
107 data
->source_directory
= SMB_VFS_NEXT_OPENDIR(handle
, fname
, mask
,
110 data
->fd
= dirfd(data
->source_directory
);
112 SMB_VFS_HANDLE_SET_DATA(handle
, data
, free_dirsort_privates
,
113 struct dirsort_privates
, return NULL
);
115 if (!open_and_sort_dir(handle
)) {
116 SMB_VFS_NEXT_CLOSEDIR(handle
,data
->source_directory
);
120 return data
->source_directory
;
123 static SMB_STRUCT_DIR
*dirsort_fdopendir(vfs_handle_struct
*handle
,
128 struct dirsort_privates
*data
= NULL
;
130 /* set up our private data about this directory */
131 data
= talloc_zero(handle
->conn
, struct dirsort_privates
);
136 data
->directory_list
= NULL
;
139 /* Open the underlying directory and count the number of entries */
140 data
->source_directory
= SMB_VFS_NEXT_FDOPENDIR(handle
, fsp
, mask
,
143 if (data
->source_directory
== NULL
) {
148 data
->fd
= dirfd(data
->source_directory
);
150 SMB_VFS_HANDLE_SET_DATA(handle
, data
, free_dirsort_privates
,
151 struct dirsort_privates
, return NULL
);
153 if (!open_and_sort_dir(handle
)) {
154 SMB_VFS_NEXT_CLOSEDIR(handle
,data
->source_directory
);
155 /* fd is now closed. */
160 return data
->source_directory
;
163 static SMB_STRUCT_DIRENT
*dirsort_readdir(vfs_handle_struct
*handle
,
164 SMB_STRUCT_DIR
*dirp
,
165 SMB_STRUCT_STAT
*sbuf
)
167 struct dirsort_privates
*data
= NULL
;
168 time_t current_mtime
;
169 struct stat dir_stat
;
171 SMB_VFS_HANDLE_GET_DATA(handle
, data
, struct dirsort_privates
,
174 if (fstat(data
->fd
, &dir_stat
) == -1) {
178 current_mtime
= dir_stat
.st_mtime
;
180 /* throw away cache and re-read the directory if we've changed */
181 if (current_mtime
> data
->mtime
) {
182 open_and_sort_dir(handle
);
185 if (data
->pos
>= data
->number_of_entries
) {
189 return &data
->directory_list
[data
->pos
++];
192 static void dirsort_seekdir(vfs_handle_struct
*handle
, SMB_STRUCT_DIR
*dirp
,
195 struct dirsort_privates
*data
= NULL
;
196 SMB_VFS_HANDLE_GET_DATA(handle
, data
, struct dirsort_privates
, return);
201 static long dirsort_telldir(vfs_handle_struct
*handle
, SMB_STRUCT_DIR
*dirp
)
203 struct dirsort_privates
*data
= NULL
;
204 SMB_VFS_HANDLE_GET_DATA(handle
, data
, struct dirsort_privates
,
210 static void dirsort_rewinddir(vfs_handle_struct
*handle
, SMB_STRUCT_DIR
*dirp
)
212 struct dirsort_privates
*data
= NULL
;
213 SMB_VFS_HANDLE_GET_DATA(handle
, data
, struct dirsort_privates
, return);
218 static struct vfs_fn_pointers vfs_dirsort_fns
= {
219 .opendir
= dirsort_opendir
,
220 .fdopendir
= dirsort_fdopendir
,
221 .readdir
= dirsort_readdir
,
222 .seekdir
= dirsort_seekdir
,
223 .telldir
= dirsort_telldir
,
224 .rewind_dir
= dirsort_rewinddir
,
227 NTSTATUS
vfs_dirsort_init(void)
229 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION
, "dirsort",