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Linux/fs/cifs/smb2ops.c

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  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);
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 char *
194 smb2_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
195                         struct cifs_tcon *tcon)
196 {
197         int pplen = vol->prepath ? strlen(vol->prepath) : 0;
198         char *full_path = NULL;
199 
200         /* if no prefix path, simply set path to the root of share to "" */
201         if (pplen == 0) {
202                 full_path = kzalloc(2, GFP_KERNEL);
203                 return full_path;
204         }
205 
206         cERROR(1, "prefixpath is not supported for SMB2 now");
207         return NULL;
208 }
209 
210 static bool
211 smb2_can_echo(struct TCP_Server_Info *server)
212 {
213         return server->echoes;
214 }
215 
216 static void
217 smb2_clear_stats(struct cifs_tcon *tcon)
218 {
219 #ifdef CONFIG_CIFS_STATS
220         int i;
221         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
222                 atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
223                 atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
224         }
225 #endif
226 }
227 
228 static void
229 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
230 {
231 #ifdef CONFIG_CIFS_STATS
232         atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
233         atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
234         seq_printf(m, "\nNegotiates: %d sent %d failed",
235                    atomic_read(&sent[SMB2_NEGOTIATE_HE]),
236                    atomic_read(&failed[SMB2_NEGOTIATE_HE]));
237         seq_printf(m, "\nSessionSetups: %d sent %d failed",
238                    atomic_read(&sent[SMB2_SESSION_SETUP_HE]),
239                    atomic_read(&failed[SMB2_SESSION_SETUP_HE]));
240 #define SMB2LOGOFF              0x0002 /* trivial request/resp */
241         seq_printf(m, "\nLogoffs: %d sent %d failed",
242                    atomic_read(&sent[SMB2_LOGOFF_HE]),
243                    atomic_read(&failed[SMB2_LOGOFF_HE]));
244         seq_printf(m, "\nTreeConnects: %d sent %d failed",
245                    atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
246                    atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
247         seq_printf(m, "\nTreeDisconnects: %d sent %d failed",
248                    atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
249                    atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
250         seq_printf(m, "\nCreates: %d sent %d failed",
251                    atomic_read(&sent[SMB2_CREATE_HE]),
252                    atomic_read(&failed[SMB2_CREATE_HE]));
253         seq_printf(m, "\nCloses: %d sent %d failed",
254                    atomic_read(&sent[SMB2_CLOSE_HE]),
255                    atomic_read(&failed[SMB2_CLOSE_HE]));
256         seq_printf(m, "\nFlushes: %d sent %d failed",
257                    atomic_read(&sent[SMB2_FLUSH_HE]),
258                    atomic_read(&failed[SMB2_FLUSH_HE]));
259         seq_printf(m, "\nReads: %d sent %d failed",
260                    atomic_read(&sent[SMB2_READ_HE]),
261                    atomic_read(&failed[SMB2_READ_HE]));
262         seq_printf(m, "\nWrites: %d sent %d failed",
263                    atomic_read(&sent[SMB2_WRITE_HE]),
264                    atomic_read(&failed[SMB2_WRITE_HE]));
265         seq_printf(m, "\nLocks: %d sent %d failed",
266                    atomic_read(&sent[SMB2_LOCK_HE]),
267                    atomic_read(&failed[SMB2_LOCK_HE]));
268         seq_printf(m, "\nIOCTLs: %d sent %d failed",
269                    atomic_read(&sent[SMB2_IOCTL_HE]),
270                    atomic_read(&failed[SMB2_IOCTL_HE]));
271         seq_printf(m, "\nCancels: %d sent %d failed",
272                    atomic_read(&sent[SMB2_CANCEL_HE]),
273                    atomic_read(&failed[SMB2_CANCEL_HE]));
274         seq_printf(m, "\nEchos: %d sent %d failed",
275                    atomic_read(&sent[SMB2_ECHO_HE]),
276                    atomic_read(&failed[SMB2_ECHO_HE]));
277         seq_printf(m, "\nQueryDirectories: %d sent %d failed",
278                    atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
279                    atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
280         seq_printf(m, "\nChangeNotifies: %d sent %d failed",
281                    atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
282                    atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
283         seq_printf(m, "\nQueryInfos: %d sent %d failed",
284                    atomic_read(&sent[SMB2_QUERY_INFO_HE]),
285                    atomic_read(&failed[SMB2_QUERY_INFO_HE]));
286         seq_printf(m, "\nSetInfos: %d sent %d failed",
287                    atomic_read(&sent[SMB2_SET_INFO_HE]),
288                    atomic_read(&failed[SMB2_SET_INFO_HE]));
289         seq_printf(m, "\nOplockBreaks: %d sent %d failed",
290                    atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
291                    atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
292 #endif
293 }
294 
295 struct smb_version_operations smb21_operations = {
296         .setup_request = smb2_setup_request,
297         .setup_async_request = smb2_setup_async_request,
298         .check_receive = smb2_check_receive,
299         .add_credits = smb2_add_credits,
300         .set_credits = smb2_set_credits,
301         .get_credits_field = smb2_get_credits_field,
302         .get_credits = smb2_get_credits,
303         .get_next_mid = smb2_get_next_mid,
304         .find_mid = smb2_find_mid,
305         .check_message = smb2_check_message,
306         .dump_detail = smb2_dump_detail,
307         .clear_stats = smb2_clear_stats,
308         .print_stats = smb2_print_stats,
309         .need_neg = smb2_need_neg,
310         .negotiate = smb2_negotiate,
311         .sess_setup = SMB2_sess_setup,
312         .logoff = SMB2_logoff,
313         .tree_connect = SMB2_tcon,
314         .tree_disconnect = SMB2_tdis,
315         .is_path_accessible = smb2_is_path_accessible,
316         .can_echo = smb2_can_echo,
317         .echo = SMB2_echo,
318         .query_path_info = smb2_query_path_info,
319         .get_srv_inum = smb2_get_srv_inum,
320         .build_path_to_root = smb2_build_path_to_root,
321         .mkdir = smb2_mkdir,
322         .mkdir_setinfo = smb2_mkdir_setinfo,
323         .rmdir = smb2_rmdir,
324 };
325 
326 struct smb_version_values smb21_values = {
327         .version_string = SMB21_VERSION_STRING,
328         .header_size = sizeof(struct smb2_hdr),
329         .max_header_size = MAX_SMB2_HDR_SIZE,
330         .lock_cmd = SMB2_LOCK,
331         .cap_unix = 0,
332         .cap_nt_find = SMB2_NT_FIND,
333         .cap_large_files = SMB2_LARGE_FILES,
334 };
335 

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