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 <linux/pagemap.h>
  21 #include "cifsglob.h"
  22 #include "smb2pdu.h"
  23 #include "smb2proto.h"
  24 #include "cifsproto.h"
  25 #include "cifs_debug.h"
  26
  27 static int
  28 change_conf(struct TCP_Server_Info *server)
  29 {
  30         server->credits += server->echo_credits + server->oplock_credits;
  31         server->oplock_credits = server->echo_credits = 0;
  32         switch (server->credits) {
  33         case 0:
  34                 return -1;
  35         case 1:
  36                 server->echoes = false;
  37                 server->oplocks = false;
  38                 cERROR(1, "disabling echoes and oplocks");
  39                 break;
  40         case 2:
  41                 server->echoes = true;
  42                 server->oplocks = false;
  43                 server->echo_credits = 1;
  44                 cFYI(1, "disabling oplocks");
  45                 break;
  46         default:
  47                 server->echoes = true;
  48                 server->oplocks = true;
  49                 server->echo_credits = 1;
  50                 server->oplock_credits = 1;
  51         }
  52         server->credits -= server->echo_credits + server->oplock_credits;
  53         return 0;
  54 }
  55
  56 static void
  57 smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
  58                  const int optype)
  59 {
  60         int *val, rc = 0;
  61         spin_lock(&server->req_lock);
  62         val = server->ops->get_credits_field(server, optype);
  63         *val += add;
  64         server->in_flight--;
  65         if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
  66                 rc = change_conf(server);
  67         spin_unlock(&server->req_lock);
  68         wake_up(&server->request_q);
  69         if (rc)
  70                 cifs_reconnect(server);
  71 }
  72
  73 static void
  74 smb2_set_credits(struct TCP_Server_Info *server, const int val)
  75 {
  76         spin_lock(&server->req_lock);
  77         server->credits = val;
  78         spin_unlock(&server->req_lock);
  79 }
  80
  81 static int *
  82 smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
  83 {
  84         switch (optype) {
  85         case CIFS_ECHO_OP:
  86                 return &server->echo_credits;
  87         case CIFS_OBREAK_OP:
  88                 return &server->oplock_credits;
  89         default:
  90                 return &server->credits;
  91         }
  92 }
  93
  94 static unsigned int
  95 smb2_get_credits(struct mid_q_entry *mid)
  96 {
  97         return le16_to_cpu(((struct smb2_hdr *)mid->resp_buf)->CreditRequest);
  98 }
  99
 100 static __u64
 101 smb2_get_next_mid(struct TCP_Server_Info *server)
 102 {
 103         __u64 mid;
 104         /* for SMB2 we need the current value */
 105         spin_lock(&GlobalMid_Lock);
 106         mid = server->CurrentMid++;
 107         spin_unlock(&GlobalMid_Lock);
 108         return mid;
 109 }
 110
 111 static struct mid_q_entry *
 112 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
 113 {
 114         struct mid_q_entry *mid;
 115         struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
 116
 117         spin_lock(&GlobalMid_Lock);
 118         list_for_each_entry(mid, &server->pending_mid_q, qhead) {
 119                 if ((mid->mid == hdr->MessageId) &&
 120                     (mid->mid_state == MID_REQUEST_SUBMITTED) &&
 121                     (mid->command == hdr->Command)) {
 122                         spin_unlock(&GlobalMid_Lock);
 123                         return mid;
 124                 }
 125         }
 126         spin_unlock(&GlobalMid_Lock);
 127         return NULL;
 128 }
 129
 130 static void
 131 smb2_dump_detail(void *buf)
 132 {
 133 #ifdef CONFIG_CIFS_DEBUG2
 134         struct smb2_hdr *smb = (struct smb2_hdr *)buf;
 135
 136         cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d",
 137                   smb->Command, smb->Status, smb->Flags, smb->MessageId,
 138                   smb->ProcessId);
 139         cERROR(1, "smb buf %p len %u", smb, smb2_calc_size(smb));
 140 #endif
 141 }
 142
 143 static bool
 144 smb2_need_neg(struct TCP_Server_Info *server)
 145 {
 146         return server->max_read == 0;
 147 }
 148
 149 static int
 150 smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 151 {
 152         int rc;
 153         ses->server->CurrentMid = 0;
 154         rc = SMB2_negotiate(xid, ses);
 155         /* BB we probably don't need to retry with modern servers */
 156         if (rc == -EAGAIN)
 157                 rc = -EHOSTDOWN;
 158         return rc;
 159 }
 160
 161 static unsigned int
 162 smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 163 {
 164         struct TCP_Server_Info *server = tcon->ses->server;
 165         unsigned int wsize;
 166
 167         /* start with specified wsize, or default */
 168         wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
 169         wsize = min_t(unsigned int, wsize, server->max_write);
 170         /*
 171          * limit write size to 2 ** 16, because we don't support multicredit
 172          * requests now.
 173          */
 174         wsize = min_t(unsigned int, wsize, 2 << 15);
 175
 176         /* limit to the amount that we can kmap at once */
 177         wsize = min_t(unsigned int, wsize, CIFS_KMAP_SIZE_LIMIT);
 178
 179         return wsize;
 180 }
 181
 182 static unsigned int
 183 smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 184 {
 185         struct TCP_Server_Info *server = tcon->ses->server;
 186         unsigned int rsize;
 187
 188         /* start with specified rsize, or default */
 189         rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
 190         rsize = min_t(unsigned int, rsize, server->max_read);
 191         /*
 192          * limit write size to 2 ** 16, because we don't support multicredit
 193          * requests now.
 194          */
 195         rsize = min_t(unsigned int, rsize, 2 << 15);
 196
 197         /* limit to the amount that we can kmap at once */
 198         rsize = min_t(unsigned int, rsize, CIFS_KMAP_SIZE_LIMIT);
 199
 200         return rsize;
 201 }
 202
 203 static int
 204 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 205                         struct cifs_sb_info *cifs_sb, const char *full_path)
 206 {
 207         int rc;
 208         __u64 persistent_fid, volatile_fid;
 209         __le16 *utf16_path;
 210
 211         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 212         if (!utf16_path)
 213                 return -ENOMEM;
 214
 215         rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
 216                        FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0, NULL);
 217         if (rc) {
 218                 kfree(utf16_path);
 219                 return rc;
 220         }
 221
 222         rc = SMB2_close(xid, tcon, persistent_fid, volatile_fid);
 223         kfree(utf16_path);
 224         return rc;
 225 }
 226
 227 static int
 228 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
 229                   struct cifs_sb_info *cifs_sb, const char *full_path,
 230                   u64 *uniqueid, FILE_ALL_INFO *data)
 231 {
 232         *uniqueid = le64_to_cpu(data->IndexNumber);
 233         return 0;
 234 }
 235
 236 static int
 237 smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
 238                      struct cifs_fid *fid, FILE_ALL_INFO *data)
 239 {
 240         int rc;
 241         struct smb2_file_all_info *smb2_data;
 242
 243         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
 244                             GFP_KERNEL);
 245         if (smb2_data == NULL)
 246                 return -ENOMEM;
 247
 248         rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
 249                              smb2_data);
 250         if (!rc)
 251                 move_smb2_info_to_cifs(data, smb2_data);
 252         kfree(smb2_data);
 253         return rc;
 254 }
 255
 256 static char *
 257 smb2_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
 258                         struct cifs_tcon *tcon)
 259 {
 260         int pplen = vol->prepath ? strlen(vol->prepath) : 0;
 261         char *full_path = NULL;
 262
 263         /* if no prefix path, simply set path to the root of share to "" */
 264         if (pplen == 0) {
 265                 full_path = kzalloc(2, GFP_KERNEL);
 266                 return full_path;
 267         }
 268
 269         cERROR(1, "prefixpath is not supported for SMB2 now");
 270         return NULL;
 271 }
 272
 273 static bool
 274 smb2_can_echo(struct TCP_Server_Info *server)
 275 {
 276         return server->echoes;
 277 }
 278
 279 static void
 280 smb2_clear_stats(struct cifs_tcon *tcon)
 281 {
 282 #ifdef CONFIG_CIFS_STATS
 283         int i;
 284         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
 285                 atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
 286                 atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
 287         }
 288 #endif
 289 }
 290
 291 static void
 292 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
 293 {
 294 #ifdef CONFIG_CIFS_STATS
 295         atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
 296         atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
 297         seq_printf(m, "\nNegotiates: %d sent %d failed",
 298                    atomic_read(&sent[SMB2_NEGOTIATE_HE]),
 299                    atomic_read(&failed[SMB2_NEGOTIATE_HE]));
 300         seq_printf(m, "\nSessionSetups: %d sent %d failed",
 301                    atomic_read(&sent[SMB2_SESSION_SETUP_HE]),
 302                    atomic_read(&failed[SMB2_SESSION_SETUP_HE]));
 303 #define SMB2LOGOFF              0x0002 /* trivial request/resp */
 304         seq_printf(m, "\nLogoffs: %d sent %d failed",
 305                    atomic_read(&sent[SMB2_LOGOFF_HE]),
 306                    atomic_read(&failed[SMB2_LOGOFF_HE]));
 307         seq_printf(m, "\nTreeConnects: %d sent %d failed",
 308                    atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
 309                    atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
 310         seq_printf(m, "\nTreeDisconnects: %d sent %d failed",
 311                    atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
 312                    atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
 313         seq_printf(m, "\nCreates: %d sent %d failed",
 314                    atomic_read(&sent[SMB2_CREATE_HE]),
 315                    atomic_read(&failed[SMB2_CREATE_HE]));
 316         seq_printf(m, "\nCloses: %d sent %d failed",
 317                    atomic_read(&sent[SMB2_CLOSE_HE]),
 318                    atomic_read(&failed[SMB2_CLOSE_HE]));
 319         seq_printf(m, "\nFlushes: %d sent %d failed",
 320                    atomic_read(&sent[SMB2_FLUSH_HE]),
 321                    atomic_read(&failed[SMB2_FLUSH_HE]));
 322         seq_printf(m, "\nReads: %d sent %d failed",
 323                    atomic_read(&sent[SMB2_READ_HE]),
 324                    atomic_read(&failed[SMB2_READ_HE]));
 325         seq_printf(m, "\nWrites: %d sent %d failed",
 326                    atomic_read(&sent[SMB2_WRITE_HE]),
 327                    atomic_read(&failed[SMB2_WRITE_HE]));
 328         seq_printf(m, "\nLocks: %d sent %d failed",
 329                    atomic_read(&sent[SMB2_LOCK_HE]),
 330                    atomic_read(&failed[SMB2_LOCK_HE]));
 331         seq_printf(m, "\nIOCTLs: %d sent %d failed",
 332                    atomic_read(&sent[SMB2_IOCTL_HE]),
 333                    atomic_read(&failed[SMB2_IOCTL_HE]));
 334         seq_printf(m, "\nCancels: %d sent %d failed",
 335                    atomic_read(&sent[SMB2_CANCEL_HE]),
 336                    atomic_read(&failed[SMB2_CANCEL_HE]));
 337         seq_printf(m, "\nEchos: %d sent %d failed",
 338                    atomic_read(&sent[SMB2_ECHO_HE]),
 339                    atomic_read(&failed[SMB2_ECHO_HE]));
 340         seq_printf(m, "\nQueryDirectories: %d sent %d failed",
 341                    atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
 342                    atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
 343         seq_printf(m, "\nChangeNotifies: %d sent %d failed",
 344                    atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
 345                    atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
 346         seq_printf(m, "\nQueryInfos: %d sent %d failed",
 347                    atomic_read(&sent[SMB2_QUERY_INFO_HE]),
 348                    atomic_read(&failed[SMB2_QUERY_INFO_HE]));
 349         seq_printf(m, "\nSetInfos: %d sent %d failed",
 350                    atomic_read(&sent[SMB2_SET_INFO_HE]),
 351                    atomic_read(&failed[SMB2_SET_INFO_HE]));
 352         seq_printf(m, "\nOplockBreaks: %d sent %d failed",
 353                    atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
 354                    atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
 355 #endif
 356 }
 357
 358 static void
 359 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
 360 {
 361         /* struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); */
 362         cfile->fid.persistent_fid = fid->persistent_fid;
 363         cfile->fid.volatile_fid = fid->volatile_fid;
 364         /* cifs_set_oplock_level(cinode, oplock); */
 365         /* cinode->can_cache_brlcks = cinode->clientCanCacheAll; */
 366 }
 367
 368 static int
 369 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
 370                 struct cifs_fid *fid)
 371 {
 372         return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 373 }
 374
 375 static int
 376 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
 377                 struct cifs_fid *fid)
 378 {
 379         return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 380 }
 381
 382 static unsigned int
 383 smb2_read_data_offset(char *buf)
 384 {
 385         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
 386         return rsp->DataOffset;
 387 }
 388
 389 static unsigned int
 390 smb2_read_data_length(char *buf)
 391 {
 392         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
 393         return le32_to_cpu(rsp->DataLength);
 394 }
 395
 396
 397 static int
 398 smb2_sync_read(const unsigned int xid, struct cifsFileInfo *cfile,
 399                struct cifs_io_parms *parms, unsigned int *bytes_read,
 400                char **buf, int *buf_type)
 401 {
 402         parms->persistent_fid = cfile->fid.persistent_fid;
 403         parms->volatile_fid = cfile->fid.volatile_fid;
 404         return SMB2_read(xid, parms, bytes_read, buf, buf_type);
 405 }
 406
 407 struct smb_version_operations smb21_operations = {
 408         .setup_request = smb2_setup_request,
 409         .setup_async_request = smb2_setup_async_request,
 410         .check_receive = smb2_check_receive,
 411         .add_credits = smb2_add_credits,
 412         .set_credits = smb2_set_credits,
 413         .get_credits_field = smb2_get_credits_field,
 414         .get_credits = smb2_get_credits,
 415         .get_next_mid = smb2_get_next_mid,
 416         .read_data_offset = smb2_read_data_offset,
 417         .read_data_length = smb2_read_data_length,
 418         .map_error = map_smb2_to_linux_error,
 419         .find_mid = smb2_find_mid,
 420         .check_message = smb2_check_message,
 421         .dump_detail = smb2_dump_detail,
 422         .clear_stats = smb2_clear_stats,
 423         .print_stats = smb2_print_stats,
 424         .need_neg = smb2_need_neg,
 425         .negotiate = smb2_negotiate,
 426         .negotiate_wsize = smb2_negotiate_wsize,
 427         .negotiate_rsize = smb2_negotiate_rsize,
 428         .sess_setup = SMB2_sess_setup,
 429         .logoff = SMB2_logoff,
 430         .tree_connect = SMB2_tcon,
 431         .tree_disconnect = SMB2_tdis,
 432         .is_path_accessible = smb2_is_path_accessible,
 433         .can_echo = smb2_can_echo,
 434         .echo = SMB2_echo,
 435         .query_path_info = smb2_query_path_info,
 436         .get_srv_inum = smb2_get_srv_inum,
 437         .query_file_info = smb2_query_file_info,
 438         .build_path_to_root = smb2_build_path_to_root,
 439         .mkdir = smb2_mkdir,
 440         .mkdir_setinfo = smb2_mkdir_setinfo,
 441         .rmdir = smb2_rmdir,
 442         .unlink = smb2_unlink,
 443         .open = smb2_open_file,
 444         .set_fid = smb2_set_fid,
 445         .close = smb2_close_file,
 446         .flush = smb2_flush_file,
 447         .async_readv = smb2_async_readv,
 448         .async_writev = smb2_async_writev,
 449         .sync_read = smb2_sync_read,
 450 };
 451
 452 struct smb_version_values smb21_values = {
 453         .version_string = SMB21_VERSION_STRING,
 454         .header_size = sizeof(struct smb2_hdr),
 455         .max_header_size = MAX_SMB2_HDR_SIZE,
 456         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
 457         .lock_cmd = SMB2_LOCK,
 458         .cap_unix = 0,
 459         .cap_nt_find = SMB2_NT_FIND,
 460         .cap_large_files = SMB2_LARGE_FILES,
 461 };