Merge branch 'master' of ssh://git.samba.org/data/git/samba
[kai/samba-autobuild/.git] / source4 / ntvfs / posix / vfs_posix.c
1 /* 
2    Unix SMB/CIFS implementation.
3
4    POSIX NTVFS backend
5
6    Copyright (C) Andrew Tridgell 2004
7
8    This program is free software; you can redistribute it and/or modify
9    it under the terms of the GNU General Public License as published by
10    the Free Software Foundation; either version 3 of the License, or
11    (at your option) any later version.
12    
13    This program is distributed in the hope that it will be useful,
14    but WITHOUT ANY WARRANTY; without even the implied warranty of
15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16    GNU General Public License for more details.
17    
18    You should have received a copy of the GNU General Public License
19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
20 */
21 /*
22   this implements most of the POSIX NTVFS backend
23   This is the default backend
24 */
25
26 #include "includes.h"
27 #include "vfs_posix.h"
28 #include "librpc/gen_ndr/security.h"
29 #include "../tdb/include/tdb.h"
30 #include "tdb_wrap.h"
31 #include "libcli/security/security.h"
32 #include "lib/events/events.h"
33 #include "param/param.h"
34
35 /*
36   setup config options for a posix share
37 */
38 static void pvfs_setup_options(struct pvfs_state *pvfs)
39 {
40         struct share_config *scfg = pvfs->ntvfs->ctx->config;
41         const char *eadb;
42
43         if (share_bool_option(scfg, SHARE_MAP_HIDDEN, SHARE_MAP_HIDDEN_DEFAULT))
44                 pvfs->flags |= PVFS_FLAG_MAP_HIDDEN;
45         if (share_bool_option(scfg, SHARE_MAP_ARCHIVE, SHARE_MAP_ARCHIVE_DEFAULT))
46                 pvfs->flags |= PVFS_FLAG_MAP_ARCHIVE;
47         if (share_bool_option(scfg, SHARE_MAP_SYSTEM, SHARE_MAP_SYSTEM_DEFAULT))
48                 pvfs->flags |= PVFS_FLAG_MAP_SYSTEM;
49         if (share_bool_option(scfg, SHARE_READONLY, SHARE_READONLY_DEFAULT))
50                 pvfs->flags |= PVFS_FLAG_READONLY;
51         if (share_bool_option(scfg, SHARE_STRICT_SYNC, SHARE_STRICT_SYNC_DEFAULT))
52                 pvfs->flags |= PVFS_FLAG_STRICT_SYNC;
53         if (share_bool_option(scfg, SHARE_STRICT_LOCKING, SHARE_STRICT_LOCKING_DEFAULT))
54                 pvfs->flags |= PVFS_FLAG_STRICT_LOCKING;
55         if (share_bool_option(scfg, SHARE_CI_FILESYSTEM, SHARE_CI_FILESYSTEM_DEFAULT))
56                 pvfs->flags |= PVFS_FLAG_CI_FILESYSTEM;
57         if (share_bool_option(scfg, PVFS_FAKE_OPLOCKS, PVFS_FAKE_OPLOCKS_DEFAULT))
58                 pvfs->flags |= PVFS_FLAG_FAKE_OPLOCKS;
59         if (share_bool_option(scfg, PVFS_AIO, false))
60                 pvfs->flags |= PVFS_FLAG_LINUX_AIO;
61
62         /* file perm options */
63         pvfs->options.create_mask       = share_int_option(scfg,
64                                                            SHARE_CREATE_MASK,
65                                                            SHARE_CREATE_MASK_DEFAULT);
66         pvfs->options.dir_mask          = share_int_option(scfg,
67                                                            SHARE_DIR_MASK,
68                                                            SHARE_DIR_MASK_DEFAULT);
69         pvfs->options.force_dir_mode    = share_int_option(scfg,
70                                                            SHARE_FORCE_DIR_MODE,
71                                                            SHARE_FORCE_DIR_MODE_DEFAULT);
72         pvfs->options.force_create_mode = share_int_option(scfg,
73                                                            SHARE_FORCE_CREATE_MODE,
74                                                            SHARE_FORCE_CREATE_MODE_DEFAULT);
75         /* this must be a power of 2 */
76         pvfs->alloc_size_rounding = share_int_option(scfg,
77                                                         PVFS_ALLOCATION_ROUNDING,
78                                                         PVFS_ALLOCATION_ROUNDING_DEFAULT);
79
80         pvfs->search.inactivity_time = share_int_option(scfg,
81                                                         PVFS_SEARCH_INACTIVITY,
82                                                         PVFS_SEARCH_INACTIVITY_DEFAULT);
83
84 #if HAVE_XATTR_SUPPORT
85         if (share_bool_option(scfg, PVFS_XATTR, PVFS_XATTR_DEFAULT))
86                 pvfs->flags |= PVFS_FLAG_XATTR_ENABLE;
87 #endif
88
89         pvfs->sharing_violation_delay = share_int_option(scfg,
90                                                         PVFS_SHARE_DELAY,
91                                                         PVFS_SHARE_DELAY_DEFAULT);
92
93         pvfs->oplock_break_timeout = share_int_option(scfg,
94                                                       PVFS_OPLOCK_TIMEOUT,
95                                                       PVFS_OPLOCK_TIMEOUT_DEFAULT);
96
97         pvfs->writetime_delay = share_int_option(scfg,
98                                                  PVFS_WRITETIME_DELAY,
99                                                  PVFS_WRITETIME_DELAY_DEFAULT);
100
101         pvfs->share_name = talloc_strdup(pvfs, scfg->name);
102
103         pvfs->fs_attribs = 
104                 FS_ATTR_CASE_SENSITIVE_SEARCH | 
105                 FS_ATTR_CASE_PRESERVED_NAMES |
106                 FS_ATTR_UNICODE_ON_DISK |
107                 FS_ATTR_SPARSE_FILES;
108
109         /* allow xattrs to be stored in a external tdb */
110         eadb = share_string_option(scfg, PVFS_EADB, NULL);
111         if (eadb != NULL) {
112                 pvfs->ea_db = tdb_wrap_open(pvfs, eadb, 50000,  
113                                             TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
114                 if (pvfs->ea_db != NULL) {
115                         pvfs->flags |= PVFS_FLAG_XATTR_ENABLE;
116                 } else {
117                         DEBUG(0,("Failed to open eadb '%s' - %s\n",
118                                  eadb, strerror(errno)));
119                         pvfs->flags &= ~PVFS_FLAG_XATTR_ENABLE;
120                 }
121         }
122
123         if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
124                 pvfs->fs_attribs |= FS_ATTR_NAMED_STREAMS;
125         }
126         if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
127                 pvfs->fs_attribs |= FS_ATTR_PERSISTANT_ACLS;
128         }
129
130         pvfs->sid_cache.creator_owner = dom_sid_parse_talloc(pvfs, SID_CREATOR_OWNER);
131         pvfs->sid_cache.creator_group = dom_sid_parse_talloc(pvfs, SID_CREATOR_GROUP);
132
133         /* check if the system really supports xattrs */
134         if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
135                 pvfs_xattr_probe(pvfs);
136         }
137
138         /* enable an ACL backend */
139         pvfs->acl_ops = pvfs_acl_backend_byname(share_string_option(scfg, PVFS_ACL, "xattr"));
140 }
141
142 static int pvfs_state_destructor(struct pvfs_state *pvfs)
143 {
144         struct pvfs_file *f, *fn;
145         struct pvfs_search_state *s, *sn;
146
147         /* 
148          * make sure we cleanup files and searches before anything else
149          * because there destructors need to acess the pvfs_state struct
150          */
151         for (f=pvfs->files.list; f; f=fn) {
152                 fn = f->next;
153                 talloc_free(f);
154         }
155
156         for (s=pvfs->search.list; s; s=sn) {
157                 sn = s->next;
158                 talloc_free(s);
159         }
160
161         return 0;
162 }
163
164 /*
165   connect to a share - used when a tree_connect operation comes
166   in. For a disk based backend we needs to ensure that the base
167   directory exists (tho it doesn't need to be accessible by the user,
168   that comes later)
169 */
170 static NTSTATUS pvfs_connect(struct ntvfs_module_context *ntvfs,
171                              struct ntvfs_request *req, const char *sharename)
172 {
173         struct pvfs_state *pvfs;
174         struct stat st;
175         char *base_directory;
176         NTSTATUS status;
177
178         /*
179          * TODO: call this from ntvfs_posix_init()
180          *       but currently we don't have a lp_ctx there
181          */
182         status = pvfs_acl_init(ntvfs->ctx->lp_ctx);
183         NT_STATUS_NOT_OK_RETURN(status);
184
185         pvfs = talloc_zero(ntvfs, struct pvfs_state);
186         NT_STATUS_HAVE_NO_MEMORY(pvfs);
187
188         /* for simplicity of path construction, remove any trailing slash now */
189         base_directory = talloc_strdup(pvfs, share_string_option(ntvfs->ctx->config, SHARE_PATH, ""));
190         NT_STATUS_HAVE_NO_MEMORY(base_directory);
191         if (strcmp(base_directory, "/") != 0) {
192                 trim_string(base_directory, NULL, "/");
193         }
194
195         pvfs->ntvfs = ntvfs;
196         pvfs->base_directory = base_directory;
197
198         /* the directory must exist. Note that we deliberately don't
199            check that it is readable */
200         if (stat(pvfs->base_directory, &st) != 0 || !S_ISDIR(st.st_mode)) {
201                 DEBUG(0,("pvfs_connect: '%s' is not a directory, when connecting to [%s]\n", 
202                          pvfs->base_directory, sharename));
203                 return NT_STATUS_BAD_NETWORK_NAME;
204         }
205
206         ntvfs->ctx->fs_type = talloc_strdup(ntvfs->ctx, "NTFS");
207         NT_STATUS_HAVE_NO_MEMORY(ntvfs->ctx->fs_type);
208
209         ntvfs->ctx->dev_type = talloc_strdup(ntvfs->ctx, "A:");
210         NT_STATUS_HAVE_NO_MEMORY(ntvfs->ctx->dev_type);
211
212         ntvfs->private_data = pvfs;
213
214         pvfs->brl_context = brl_init(pvfs, 
215                                      pvfs->ntvfs->ctx->server_id,
216                                      pvfs->ntvfs->ctx->lp_ctx,
217                                      pvfs->ntvfs->ctx->msg_ctx);
218         if (pvfs->brl_context == NULL) {
219                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
220         }
221
222         pvfs->odb_context = odb_init(pvfs, pvfs->ntvfs->ctx);
223         if (pvfs->odb_context == NULL) {
224                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
225         }
226
227         /* allow this to be NULL - we just disable change notify */
228         pvfs->notify_context = notify_init(pvfs, 
229                                            pvfs->ntvfs->ctx->server_id,  
230                                            pvfs->ntvfs->ctx->msg_ctx, 
231                                            pvfs->ntvfs->ctx->lp_ctx, 
232                                            pvfs->ntvfs->ctx->event_ctx,
233                                            pvfs->ntvfs->ctx->config);
234
235         pvfs->wbc_ctx = wbc_init(pvfs,
236                                  pvfs->ntvfs->ctx->msg_ctx,
237                                  pvfs->ntvfs->ctx->event_ctx);
238         if (pvfs->wbc_ctx == NULL) {
239                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
240         }
241
242         /* allocate the search handle -> ptr tree */
243         pvfs->search.idtree = idr_init(pvfs);
244         NT_STATUS_HAVE_NO_MEMORY(pvfs->search.idtree);
245
246         status = pvfs_mangle_init(pvfs);
247         NT_STATUS_NOT_OK_RETURN(status);
248
249         pvfs_setup_options(pvfs);
250
251         talloc_set_destructor(pvfs, pvfs_state_destructor);
252
253 #ifdef SIGXFSZ
254         /* who had the stupid idea to generate a signal on a large
255            file write instead of just failing it!? */
256         BlockSignals(true, SIGXFSZ);
257 #endif
258
259         return NT_STATUS_OK;
260 }
261
262 /*
263   disconnect from a share
264 */
265 static NTSTATUS pvfs_disconnect(struct ntvfs_module_context *ntvfs)
266 {
267         return NT_STATUS_OK;
268 }
269
270 /*
271   check if a directory exists
272 */
273 static NTSTATUS pvfs_chkpath(struct ntvfs_module_context *ntvfs,
274                              struct ntvfs_request *req,
275                              union smb_chkpath *cp)
276 {
277         struct pvfs_state *pvfs = ntvfs->private_data;
278         struct pvfs_filename *name;
279         NTSTATUS status;
280
281         /* resolve the cifs name to a posix name */
282         status = pvfs_resolve_name(pvfs, req, cp->chkpath.in.path, 0, &name);
283         NT_STATUS_NOT_OK_RETURN(status);
284
285         if (!name->exists) {
286                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
287         }
288
289         if (!S_ISDIR(name->st.st_mode)) {
290                 return NT_STATUS_NOT_A_DIRECTORY;
291         }
292
293         return NT_STATUS_OK;
294 }
295
296 /*
297   copy a set of files
298 */
299 static NTSTATUS pvfs_copy(struct ntvfs_module_context *ntvfs,
300                           struct ntvfs_request *req, struct smb_copy *cp)
301 {
302         DEBUG(0,("pvfs_copy not implemented\n"));
303         return NT_STATUS_NOT_SUPPORTED;
304 }
305
306 /*
307   return print queue info
308 */
309 static NTSTATUS pvfs_lpq(struct ntvfs_module_context *ntvfs,
310                          struct ntvfs_request *req, union smb_lpq *lpq)
311 {
312         return NT_STATUS_NOT_SUPPORTED;
313 }
314
315 /* SMBtrans - not used on file shares */
316 static NTSTATUS pvfs_trans(struct ntvfs_module_context *ntvfs,
317                            struct ntvfs_request *req, struct smb_trans2 *trans2)
318 {
319         return NT_STATUS_ACCESS_DENIED;
320 }
321
322 /*
323   initialialise the POSIX disk backend, registering ourselves with the ntvfs subsystem
324  */
325 NTSTATUS ntvfs_posix_init(void)
326 {
327         NTSTATUS ret;
328         struct ntvfs_ops ops;
329         NTVFS_CURRENT_CRITICAL_SIZES(vers);
330
331         ZERO_STRUCT(ops);
332
333         ops.type = NTVFS_DISK;
334         
335         /* fill in all the operations */
336         ops.connect = pvfs_connect;
337         ops.disconnect = pvfs_disconnect;
338         ops.unlink = pvfs_unlink;
339         ops.chkpath = pvfs_chkpath;
340         ops.qpathinfo = pvfs_qpathinfo;
341         ops.setpathinfo = pvfs_setpathinfo;
342         ops.open = pvfs_open;
343         ops.mkdir = pvfs_mkdir;
344         ops.rmdir = pvfs_rmdir;
345         ops.rename = pvfs_rename;
346         ops.copy = pvfs_copy;
347         ops.ioctl = pvfs_ioctl;
348         ops.read = pvfs_read;
349         ops.write = pvfs_write;
350         ops.seek = pvfs_seek;
351         ops.flush = pvfs_flush; 
352         ops.close = pvfs_close;
353         ops.exit = pvfs_exit;
354         ops.lock = pvfs_lock;
355         ops.setfileinfo = pvfs_setfileinfo;
356         ops.qfileinfo = pvfs_qfileinfo;
357         ops.fsinfo = pvfs_fsinfo;
358         ops.lpq = pvfs_lpq;
359         ops.search_first = pvfs_search_first;
360         ops.search_next = pvfs_search_next;
361         ops.search_close = pvfs_search_close;
362         ops.trans = pvfs_trans;
363         ops.logoff = pvfs_logoff;
364         ops.async_setup = pvfs_async_setup;
365         ops.cancel = pvfs_cancel;
366         ops.notify = pvfs_notify;
367
368         /* register ourselves with the NTVFS subsystem. We register
369            under the name 'default' as we wish to be the default
370            backend, and also register as 'posix' */
371         ops.name = "default";
372         ret = ntvfs_register(&ops, &vers);
373
374         if (!NT_STATUS_IS_OK(ret)) {
375                 DEBUG(0,("Failed to register POSIX backend as '%s'!\n", ops.name));
376         }
377
378         ops.name = "posix";
379         ret = ntvfs_register(&ops, &vers);
380
381         if (!NT_STATUS_IS_OK(ret)) {
382                 DEBUG(0,("Failed to register POSIX backend as '%s'!\n", ops.name));
383         }
384
385         if (NT_STATUS_IS_OK(ret)) {
386                 ret = ntvfs_common_init();
387         }
388
389         return ret;
390 }