CIFS: Add SMB2 support for flush
[linux-3.10.git] / fs / cifs / smb2ops.c
1 /*
2  *  SMB2 version specific operations
3  *
4  *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
5  *
6  *  This library is free software; you can redistribute it and/or modify
7  *  it under the terms of the GNU General Public License v2 as published
8  *  by the Free Software Foundation.
9  *
10  *  This library is distributed in the hope that it will be useful,
11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
13  *  the GNU Lesser General Public License for more details.
14  *
15  *  You should have received a copy of the GNU Lesser General Public License
16  *  along with this library; if not, write to the Free Software
17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  */
19
20 #include "cifsglob.h"
21 #include "smb2pdu.h"
22 #include "smb2proto.h"
23 #include "cifsproto.h"
24 #include "cifs_debug.h"
25
26 static int
27 change_conf(struct TCP_Server_Info *server)
28 {
29         server->credits += server->echo_credits + server->oplock_credits;
30         server->oplock_credits = server->echo_credits = 0;
31         switch (server->credits) {
32         case 0:
33                 return -1;
34         case 1:
35                 server->echoes = false;
36                 server->oplocks = false;
37                 cERROR(1, "disabling echoes and oplocks");
38                 break;
39         case 2:
40                 server->echoes = true;
41                 server->oplocks = false;
42                 server->echo_credits = 1;
43                 cFYI(1, "disabling oplocks");
44                 break;
45         default:
46                 server->echoes = true;
47                 server->oplocks = true;
48                 server->echo_credits = 1;
49                 server->oplock_credits = 1;
50         }
51         server->credits -= server->echo_credits + server->oplock_credits;
52         return 0;
53 }
54
55 static void
56 smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
57                  const int optype)
58 {
59         int *val, rc = 0;
60         spin_lock(&server->req_lock);
61         val = server->ops->get_credits_field(server, optype);
62         *val += add;
63         server->in_flight--;
64         if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
65                 rc = change_conf(server);
66         spin_unlock(&server->req_lock);
67         wake_up(&server->request_q);
68         if (rc)
69                 cifs_reconnect(server);
70 }
71
72 static void
73 smb2_set_credits(struct TCP_Server_Info *server, const int val)
74 {
75         spin_lock(&server->req_lock);
76         server->credits = val;
77         spin_unlock(&server->req_lock);
78 }
79
80 static int *
81 smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
82 {
83         switch (optype) {
84         case CIFS_ECHO_OP:
85                 return &server->echo_credits;
86         case CIFS_OBREAK_OP:
87                 return &server->oplock_credits;
88         default:
89                 return &server->credits;
90         }
91 }
92
93 static unsigned int
94 smb2_get_credits(struct mid_q_entry *mid)
95 {
96         return le16_to_cpu(((struct smb2_hdr *)mid->resp_buf)->CreditRequest);
97 }
98
99 static __u64
100 smb2_get_next_mid(struct TCP_Server_Info *server)
101 {
102         __u64 mid;
103         /* for SMB2 we need the current value */
104         spin_lock(&GlobalMid_Lock);
105         mid = server->CurrentMid++;
106         spin_unlock(&GlobalMid_Lock);
107         return mid;
108 }
109
110 static struct mid_q_entry *
111 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
112 {
113         struct mid_q_entry *mid;
114         struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
115
116         spin_lock(&GlobalMid_Lock);
117         list_for_each_entry(mid, &server->pending_mid_q, qhead) {
118                 if ((mid->mid == hdr->MessageId) &&
119                     (mid->mid_state == MID_REQUEST_SUBMITTED) &&
120                     (mid->command == hdr->Command)) {
121                         spin_unlock(&GlobalMid_Lock);
122                         return mid;
123                 }
124         }
125         spin_unlock(&GlobalMid_Lock);
126         return NULL;
127 }
128
129 static void
130 smb2_dump_detail(void *buf)
131 {
132 #ifdef CONFIG_CIFS_DEBUG2
133         struct smb2_hdr *smb = (struct smb2_hdr *)buf;
134
135         cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d",
136                   smb->Command, smb->Status, smb->Flags, smb->MessageId,
137                   smb->ProcessId);
138         cERROR(1, "smb buf %p len %u", smb, smb2_calc_size(smb));
139 #endif
140 }
141
142 static bool
143 smb2_need_neg(struct TCP_Server_Info *server)
144 {
145         return server->max_read == 0;
146 }
147
148 static int
149 smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
150 {
151         int rc;
152         ses->server->CurrentMid = 0;
153         rc = SMB2_negotiate(xid, ses);
154         /* BB we probably don't need to retry with modern servers */
155         if (rc == -EAGAIN)
156                 rc = -EHOSTDOWN;
157         return rc;
158 }
159
160 static int
161 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
162                         struct cifs_sb_info *cifs_sb, const char *full_path)
163 {
164         int rc;
165         __u64 persistent_fid, volatile_fid;
166         __le16 *utf16_path;
167
168         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
169         if (!utf16_path)
170                 return -ENOMEM;
171
172         rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
173                        FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0, NULL);
174         if (rc) {
175                 kfree(utf16_path);
176                 return rc;
177         }
178
179         rc = SMB2_close(xid, tcon, persistent_fid, volatile_fid);
180         kfree(utf16_path);
181         return rc;
182 }
183
184 static int
185 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
186                   struct cifs_sb_info *cifs_sb, const char *full_path,
187                   u64 *uniqueid, FILE_ALL_INFO *data)
188 {
189         *uniqueid = le64_to_cpu(data->IndexNumber);
190         return 0;
191 }
192
193 static int
194 smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
195                      struct cifs_fid *fid, FILE_ALL_INFO *data)
196 {
197         int rc;
198         struct smb2_file_all_info *smb2_data;
199
200         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
201                             GFP_KERNEL);
202         if (smb2_data == NULL)
203                 return -ENOMEM;
204
205         rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
206                              smb2_data);
207         if (!rc)
208                 move_smb2_info_to_cifs(data, smb2_data);
209         kfree(smb2_data);
210         return rc;
211 }
212
213 static char *
214 smb2_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
215                         struct cifs_tcon *tcon)
216 {
217         int pplen = vol->prepath ? strlen(vol->prepath) : 0;
218         char *full_path = NULL;
219
220         /* if no prefix path, simply set path to the root of share to "" */
221         if (pplen == 0) {
222                 full_path = kzalloc(2, GFP_KERNEL);
223                 return full_path;
224         }
225
226         cERROR(1, "prefixpath is not supported for SMB2 now");
227         return NULL;
228 }
229
230 static bool
231 smb2_can_echo(struct TCP_Server_Info *server)
232 {
233         return server->echoes;
234 }
235
236 static void
237 smb2_clear_stats(struct cifs_tcon *tcon)
238 {
239 #ifdef CONFIG_CIFS_STATS
240         int i;
241         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
242                 atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
243                 atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
244         }
245 #endif
246 }
247
248 static void
249 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
250 {
251 #ifdef CONFIG_CIFS_STATS
252         atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
253         atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
254         seq_printf(m, "\nNegotiates: %d sent %d failed",
255                    atomic_read(&sent[SMB2_NEGOTIATE_HE]),
256                    atomic_read(&failed[SMB2_NEGOTIATE_HE]));
257         seq_printf(m, "\nSessionSetups: %d sent %d failed",
258                    atomic_read(&sent[SMB2_SESSION_SETUP_HE]),
259                    atomic_read(&failed[SMB2_SESSION_SETUP_HE]));
260 #define SMB2LOGOFF              0x0002 /* trivial request/resp */
261         seq_printf(m, "\nLogoffs: %d sent %d failed",
262                    atomic_read(&sent[SMB2_LOGOFF_HE]),
263                    atomic_read(&failed[SMB2_LOGOFF_HE]));
264         seq_printf(m, "\nTreeConnects: %d sent %d failed",
265                    atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
266                    atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
267         seq_printf(m, "\nTreeDisconnects: %d sent %d failed",
268                    atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
269                    atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
270         seq_printf(m, "\nCreates: %d sent %d failed",
271                    atomic_read(&sent[SMB2_CREATE_HE]),
272                    atomic_read(&failed[SMB2_CREATE_HE]));
273         seq_printf(m, "\nCloses: %d sent %d failed",
274                    atomic_read(&sent[SMB2_CLOSE_HE]),
275                    atomic_read(&failed[SMB2_CLOSE_HE]));
276         seq_printf(m, "\nFlushes: %d sent %d failed",
277                    atomic_read(&sent[SMB2_FLUSH_HE]),
278                    atomic_read(&failed[SMB2_FLUSH_HE]));
279         seq_printf(m, "\nReads: %d sent %d failed",
280                    atomic_read(&sent[SMB2_READ_HE]),
281                    atomic_read(&failed[SMB2_READ_HE]));
282         seq_printf(m, "\nWrites: %d sent %d failed",
283                    atomic_read(&sent[SMB2_WRITE_HE]),
284                    atomic_read(&failed[SMB2_WRITE_HE]));
285         seq_printf(m, "\nLocks: %d sent %d failed",
286                    atomic_read(&sent[SMB2_LOCK_HE]),
287                    atomic_read(&failed[SMB2_LOCK_HE]));
288         seq_printf(m, "\nIOCTLs: %d sent %d failed",
289                    atomic_read(&sent[SMB2_IOCTL_HE]),
290                    atomic_read(&failed[SMB2_IOCTL_HE]));
291         seq_printf(m, "\nCancels: %d sent %d failed",
292                    atomic_read(&sent[SMB2_CANCEL_HE]),
293                    atomic_read(&failed[SMB2_CANCEL_HE]));
294         seq_printf(m, "\nEchos: %d sent %d failed",
295                    atomic_read(&sent[SMB2_ECHO_HE]),
296                    atomic_read(&failed[SMB2_ECHO_HE]));
297         seq_printf(m, "\nQueryDirectories: %d sent %d failed",
298                    atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
299                    atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
300         seq_printf(m, "\nChangeNotifies: %d sent %d failed",
301                    atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
302                    atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
303         seq_printf(m, "\nQueryInfos: %d sent %d failed",
304                    atomic_read(&sent[SMB2_QUERY_INFO_HE]),
305                    atomic_read(&failed[SMB2_QUERY_INFO_HE]));
306         seq_printf(m, "\nSetInfos: %d sent %d failed",
307                    atomic_read(&sent[SMB2_SET_INFO_HE]),
308                    atomic_read(&failed[SMB2_SET_INFO_HE]));
309         seq_printf(m, "\nOplockBreaks: %d sent %d failed",
310                    atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
311                    atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
312 #endif
313 }
314
315 static void
316 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
317 {
318         /* struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); */
319         cfile->fid.persistent_fid = fid->persistent_fid;
320         cfile->fid.volatile_fid = fid->volatile_fid;
321         /* cifs_set_oplock_level(cinode, oplock); */
322         /* cinode->can_cache_brlcks = cinode->clientCanCacheAll; */
323 }
324
325 static int
326 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
327                 struct cifs_fid *fid)
328 {
329         return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
330 }
331
332 static int
333 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
334                 struct cifs_fid *fid)
335 {
336         return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
337 }
338
339 struct smb_version_operations smb21_operations = {
340         .setup_request = smb2_setup_request,
341         .setup_async_request = smb2_setup_async_request,
342         .check_receive = smb2_check_receive,
343         .add_credits = smb2_add_credits,
344         .set_credits = smb2_set_credits,
345         .get_credits_field = smb2_get_credits_field,
346         .get_credits = smb2_get_credits,
347         .get_next_mid = smb2_get_next_mid,
348         .find_mid = smb2_find_mid,
349         .check_message = smb2_check_message,
350         .dump_detail = smb2_dump_detail,
351         .clear_stats = smb2_clear_stats,
352         .print_stats = smb2_print_stats,
353         .need_neg = smb2_need_neg,
354         .negotiate = smb2_negotiate,
355         .sess_setup = SMB2_sess_setup,
356         .logoff = SMB2_logoff,
357         .tree_connect = SMB2_tcon,
358         .tree_disconnect = SMB2_tdis,
359         .is_path_accessible = smb2_is_path_accessible,
360         .can_echo = smb2_can_echo,
361         .echo = SMB2_echo,
362         .query_path_info = smb2_query_path_info,
363         .get_srv_inum = smb2_get_srv_inum,
364         .query_file_info = smb2_query_file_info,
365         .build_path_to_root = smb2_build_path_to_root,
366         .mkdir = smb2_mkdir,
367         .mkdir_setinfo = smb2_mkdir_setinfo,
368         .rmdir = smb2_rmdir,
369         .unlink = smb2_unlink,
370         .open = smb2_open_file,
371         .set_fid = smb2_set_fid,
372         .close = smb2_close_file,
373         .flush = smb2_flush_file,
374 };
375
376 struct smb_version_values smb21_values = {
377         .version_string = SMB21_VERSION_STRING,
378         .header_size = sizeof(struct smb2_hdr),
379         .max_header_size = MAX_SMB2_HDR_SIZE,
380         .lock_cmd = SMB2_LOCK,
381         .cap_unix = 0,
382         .cap_nt_find = SMB2_NT_FIND,
383         .cap_large_files = SMB2_LARGE_FILES,
384 };