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/>.
23 static int compare_dirent (const SMB_STRUCT_DIRENT
*da
, const SMB_STRUCT_DIRENT
*db
)
25 return StrCaseCmp(da
->d_name
, db
->d_name
);
28 struct dirsort_privates
{
30 SMB_STRUCT_DIRENT
*directory_list
;
31 long number_of_entries
;
33 SMB_STRUCT_DIR
*source_directory
;
37 static void free_dirsort_privates(void **datap
) {
38 struct dirsort_privates
*data
= (struct dirsort_privates
*) *datap
;
39 SAFE_FREE(data
->directory_list
);
46 static void open_and_sort_dir (vfs_handle_struct
*handle
)
48 SMB_STRUCT_DIRENT
*dp
;
51 struct dirsort_privates
*data
= NULL
;
53 SMB_VFS_HANDLE_GET_DATA(handle
, data
, struct dirsort_privates
, return);
55 data
->number_of_entries
= 0;
57 if (fstat(data
->fd
, &dir_stat
) == 0) {
58 data
->mtime
= dir_stat
.st_mtime
;
61 while (SMB_VFS_NEXT_READDIR(handle
, data
->source_directory
, NULL
)
63 data
->number_of_entries
++;
66 /* Open the underlying directory and count the number of entries
67 Skip back to the beginning as we'll read it again */
68 SMB_VFS_NEXT_REWINDDIR(handle
, data
->source_directory
);
70 /* Set up an array and read the directory entries into it */
71 SAFE_FREE(data
->directory_list
); /* destroy previous cache if needed */
72 data
->directory_list
= (SMB_STRUCT_DIRENT
*)SMB_MALLOC(
73 data
->number_of_entries
* sizeof(SMB_STRUCT_DIRENT
));
74 current_pos
= data
->pos
;
76 while ((dp
= SMB_VFS_NEXT_READDIR(handle
, data
->source_directory
,
78 data
->directory_list
[data
->pos
++] = *dp
;
81 /* Sort the directory entries by name */
82 data
->pos
= current_pos
;
83 TYPESAFE_QSORT(data
->directory_list
, data
->number_of_entries
, compare_dirent
);
86 static SMB_STRUCT_DIR
*dirsort_opendir(vfs_handle_struct
*handle
,
87 const char *fname
, const char *mask
,
90 struct dirsort_privates
*data
= NULL
;
92 /* set up our private data about this directory */
93 data
= (struct dirsort_privates
*)SMB_MALLOC(
94 sizeof(struct dirsort_privates
));
96 data
->directory_list
= NULL
;
99 /* Open the underlying directory and count the number of entries */
100 data
->source_directory
= SMB_VFS_NEXT_OPENDIR(handle
, fname
, mask
,
103 data
->fd
= dirfd(data
->source_directory
);
105 SMB_VFS_HANDLE_SET_DATA(handle
, data
, free_dirsort_privates
,
106 struct dirsort_privates
, return NULL
);
108 open_and_sort_dir(handle
);
110 return data
->source_directory
;
113 static SMB_STRUCT_DIRENT
*dirsort_readdir(vfs_handle_struct
*handle
,
114 SMB_STRUCT_DIR
*dirp
,
115 SMB_STRUCT_STAT
*sbuf
)
117 struct dirsort_privates
*data
= NULL
;
118 time_t current_mtime
;
119 struct stat dir_stat
;
121 SMB_VFS_HANDLE_GET_DATA(handle
, data
, struct dirsort_privates
,
124 if (fstat(data
->fd
, &dir_stat
) == -1) {
128 current_mtime
= dir_stat
.st_mtime
;
130 /* throw away cache and re-read the directory if we've changed */
131 if (current_mtime
> data
->mtime
) {
132 open_and_sort_dir(handle
);
135 if (data
->pos
>= data
->number_of_entries
) {
139 return &data
->directory_list
[data
->pos
++];
142 static void dirsort_seekdir(vfs_handle_struct
*handle
, SMB_STRUCT_DIR
*dirp
,
145 struct dirsort_privates
*data
= NULL
;
146 SMB_VFS_HANDLE_GET_DATA(handle
, data
, struct dirsort_privates
, return);
151 static long dirsort_telldir(vfs_handle_struct
*handle
, SMB_STRUCT_DIR
*dirp
)
153 struct dirsort_privates
*data
= NULL
;
154 SMB_VFS_HANDLE_GET_DATA(handle
, data
, struct dirsort_privates
,
160 static void dirsort_rewinddir(vfs_handle_struct
*handle
, SMB_STRUCT_DIR
*dirp
)
162 struct dirsort_privates
*data
= NULL
;
163 SMB_VFS_HANDLE_GET_DATA(handle
, data
, struct dirsort_privates
, return);
168 static struct vfs_fn_pointers vfs_dirsort_fns
= {
169 .opendir
= dirsort_opendir
,
170 .readdir
= dirsort_readdir
,
171 .seekdir
= dirsort_seekdir
,
172 .telldir
= dirsort_telldir
,
173 .rewind_dir
= dirsort_rewinddir
,
176 NTSTATUS
vfs_dirsort_init(void)
178 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION
, "dirsort",