fs/cifs/cifsfs.c

   1 /*
   2  *   fs/cifs/cifsfs.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2004
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   Common Internet FileSystem (CIFS) client
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 /* Note that BB means BUGBUG (ie something to fix eventually) */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/mount.h>
  29 #include <linux/slab.h>
  30 #include <linux/init.h>
  31 #include <linux/list.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/vfs.h>
  34 #include <linux/mempool.h>
  35 #include <linux/delay.h>
  36 #include "cifsfs.h"
  37 #include "cifspdu.h"
  38 #define DECLARE_GLOBALS_HERE
  39 #include "cifsglob.h"
  40 #include "cifsproto.h"
  41 #include "cifs_debug.h"
  42 #include "cifs_fs_sb.h"
  43 #include <linux/mm.h>
  44 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
  45
  46 #ifdef CONFIG_CIFS_QUOTA
  47 static struct quotactl_ops cifs_quotactl_ops;
  48 #endif
  49
  50 int cifsFYI = 0;
  51 int cifsERROR = 1;
  52 int traceSMB = 0;
  53 unsigned int oplockEnabled = 1;
  54 unsigned int experimEnabled = 0;
  55 unsigned int linuxExtEnabled = 1;
  56 unsigned int lookupCacheEnabled = 1;
  57 unsigned int multiuser_mount = 0;
  58 unsigned int extended_security = 0;
  59 unsigned int ntlmv2_support = 0;
  60 unsigned int sign_CIFS_PDUs = 1;
  61 extern struct task_struct * oplockThread; /* remove sparse warning */
  62 struct task_struct * oplockThread = NULL;
  63 extern struct task_struct * dnotifyThread; /* remove sparse warning */
  64 struct task_struct * dnotifyThread = NULL;
  65 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  66 module_param(CIFSMaxBufSize, int, 0);
  67 MODULE_PARM_DESC(CIFSMaxBufSize,"Network buffer size (not including header). Default: 16384 Range: 8192 to 130048");
  68 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  69 module_param(cifs_min_rcv, int, 0);
  70 MODULE_PARM_DESC(cifs_min_rcv,"Network buffers in pool. Default: 4 Range: 1 to 64");
  71 unsigned int cifs_min_small = 30;
  72 module_param(cifs_min_small, int, 0);
  73 MODULE_PARM_DESC(cifs_min_small,"Small network buffers in pool. Default: 30 Range: 2 to 256");
  74 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  75 module_param(cifs_max_pending, int, 0);
  76 MODULE_PARM_DESC(cifs_max_pending,"Simultaneous requests to server. Default: 50 Range: 2 to 256");
  77
  78 static DECLARE_COMPLETION(cifs_oplock_exited);
  79 static DECLARE_COMPLETION(cifs_dnotify_exited);
  80
  81 extern mempool_t *cifs_sm_req_poolp;
  82 extern mempool_t *cifs_req_poolp;
  83 extern mempool_t *cifs_mid_poolp;
  84
  85 extern kmem_cache_t *cifs_oplock_cachep;
  86
  87 static int
  88 cifs_read_super(struct super_block *sb, void *data,
  89                 const char *devname, int silent)
  90 {
  91         struct inode *inode;
  92         struct cifs_sb_info *cifs_sb;
  93         int rc = 0;
  94
  95         sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */
  96         sb->s_fs_info = kmalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
  97         cifs_sb = CIFS_SB(sb);
  98         if(cifs_sb == NULL)
  99                 return -ENOMEM;
 100         else
 101                 memset(cifs_sb,0,sizeof(struct cifs_sb_info));
 102
 103
 104         rc = cifs_mount(sb, cifs_sb, data, devname);
 105
 106         if (rc) {
 107                 if (!silent)
 108                         cERROR(1,
 109                                ("cifs_mount failed w/return code = %d", rc));
 110                 goto out_mount_failed;
 111         }
 112
 113         sb->s_magic = CIFS_MAGIC_NUMBER;
 114         sb->s_op = &cifs_super_ops;
 115 /*      if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
 116             sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
 117 #ifdef CONFIG_CIFS_QUOTA
 118         sb->s_qcop = &cifs_quotactl_ops;
 119 #endif
 120         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 121         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 122         inode = iget(sb, ROOT_I);
 123
 124         if (!inode) {
 125                 rc = -ENOMEM;
 126                 goto out_no_root;
 127         }
 128
 129         sb->s_root = d_alloc_root(inode);
 130
 131         if (!sb->s_root) {
 132                 rc = -ENOMEM;
 133                 goto out_no_root;
 134         }
 135
 136         return 0;
 137
 138 out_no_root:
 139         cERROR(1, ("cifs_read_super: get root inode failed"));
 140         if (inode)
 141                 iput(inode);
 142
 143 out_mount_failed:
 144         if(cifs_sb) {
 145                 if(cifs_sb->local_nls)
 146                         unload_nls(cifs_sb->local_nls);
 147                 kfree(cifs_sb);
 148         }
 149         return rc;
 150 }
 151
 152 static void
 153 cifs_put_super(struct super_block *sb)
 154 {
 155         int rc = 0;
 156         struct cifs_sb_info *cifs_sb;
 157
 158         cFYI(1, ("In cifs_put_super"));
 159         cifs_sb = CIFS_SB(sb);
 160         if(cifs_sb == NULL) {
 161                 cFYI(1,("Empty cifs superblock info passed to unmount"));
 162                 return;
 163         }
 164         rc = cifs_umount(sb, cifs_sb);
 165         if (rc) {
 166                 cERROR(1, ("cifs_umount failed with return code %d", rc));
 167         }
 168         unload_nls(cifs_sb->local_nls);
 169         kfree(cifs_sb);
 170         return;
 171 }
 172
 173 static int
 174 cifs_statfs(struct super_block *sb, struct kstatfs *buf)
 175 {
 176         int xid;
 177         int rc = -EOPNOTSUPP;
 178         struct cifs_sb_info *cifs_sb;
 179         struct cifsTconInfo *pTcon;
 180
 181         xid = GetXid();
 182
 183         cifs_sb = CIFS_SB(sb);
 184         pTcon = cifs_sb->tcon;
 185
 186         buf->f_type = CIFS_MAGIC_NUMBER;
 187
 188         /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
 189         buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would
 190                                       presumably be total path, but note
 191                                       that some servers (includinng Samba 3)
 192                                       have a shorter maximum path */
 193         buf->f_files = 0;       /* undefined */
 194         buf->f_ffree = 0;       /* unlimited */
 195
 196 #ifdef CONFIG_CIFS_EXPERIMENTAL
 197 /* BB we could add a second check for a QFS Unix capability bit */
 198 /* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
 199     if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &
 200                         le64_to_cpu(pTcon->fsUnixInfo.Capability)))
 201             rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);
 202
 203     /* Only need to call the old QFSInfo if failed
 204     on newer one */
 205     if(rc)
 206 #endif /* CIFS_EXPERIMENTAL */
 207         rc = CIFSSMBQFSInfo(xid, pTcon, buf);
 208
 209         /* Old Windows servers do not support level 103, retry with level
 210            one if old server failed the previous call */
 211         if(rc)
 212                 rc = SMBOldQFSInfo(xid, pTcon, buf);
 213         /*
 214            int f_type;
 215            __fsid_t f_fsid;
 216            int f_namelen;  */
 217         /* BB get from info in tcon struct at mount time call to QFSAttrInfo */
 218         FreeXid(xid);
 219         return 0;               /* always return success? what if volume is no
 220                                    longer available? */
 221 }
 222
 223 static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
 224 {
 225         struct cifs_sb_info *cifs_sb;
 226
 227         cifs_sb = CIFS_SB(inode->i_sb);
 228
 229         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 230                 return 0;
 231         } else /* file mode might have been restricted at mount time
 232                 on the client (above and beyond ACL on servers) for
 233                 servers which do not support setting and viewing mode bits,
 234                 so allowing client to check permissions is useful */
 235                 return generic_permission(inode, mask, NULL);
 236 }
 237
 238 static kmem_cache_t *cifs_inode_cachep;
 239 static kmem_cache_t *cifs_req_cachep;
 240 static kmem_cache_t *cifs_mid_cachep;
 241 kmem_cache_t *cifs_oplock_cachep;
 242 static kmem_cache_t *cifs_sm_req_cachep;
 243 mempool_t *cifs_sm_req_poolp;
 244 mempool_t *cifs_req_poolp;
 245 mempool_t *cifs_mid_poolp;
 246
 247 static struct inode *
 248 cifs_alloc_inode(struct super_block *sb)
 249 {
 250         struct cifsInodeInfo *cifs_inode;
 251         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, SLAB_KERNEL);
 252         if (!cifs_inode)
 253                 return NULL;
 254         cifs_inode->cifsAttrs = 0x20;   /* default */
 255         atomic_set(&cifs_inode->inUse, 0);
 256         cifs_inode->time = 0;
 257         /* Until the file is open and we have gotten oplock
 258         info back from the server, can not assume caching of
 259         file data or metadata */
 260         cifs_inode->clientCanCacheRead = FALSE;
 261         cifs_inode->clientCanCacheAll = FALSE;
 262         cifs_inode->vfs_inode.i_blksize = CIFS_MAX_MSGSIZE;
 263         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 264         cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;
 265         INIT_LIST_HEAD(&cifs_inode->openFileList);
 266         return &cifs_inode->vfs_inode;
 267 }
 268
 269 static void
 270 cifs_destroy_inode(struct inode *inode)
 271 {
 272         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 273 }
 274
 275 /*
 276  * cifs_show_options() is for displaying mount options in /proc/mounts.
 277  * Not all settable options are displayed but most of the important
 278  * ones are.
 279  */
 280 static int
 281 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 282 {
 283         struct cifs_sb_info *cifs_sb;
 284
 285         cifs_sb = CIFS_SB(m->mnt_sb);
 286
 287         if (cifs_sb) {
 288                 if (cifs_sb->tcon) {
 289                         seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
 290                         if (cifs_sb->tcon->ses) {
 291                                 if (cifs_sb->tcon->ses->userName)
 292                                         seq_printf(s, ",username=%s",
 293                                            cifs_sb->tcon->ses->userName);
 294                                 if(cifs_sb->tcon->ses->domainName)
 295                                         seq_printf(s, ",domain=%s",
 296                                            cifs_sb->tcon->ses->domainName);
 297                         }
 298                 }
 299                 seq_printf(s, ",rsize=%d",cifs_sb->rsize);
 300                 seq_printf(s, ",wsize=%d",cifs_sb->wsize);
 301         }
 302         return 0;
 303 }
 304
 305 #ifdef CONFIG_CIFS_QUOTA
 306 int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
 307                 struct fs_disk_quota * pdquota)
 308 {
 309         int xid;
 310         int rc = 0;
 311         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 312         struct cifsTconInfo *pTcon;
 313
 314         if(cifs_sb)
 315                 pTcon = cifs_sb->tcon;
 316         else
 317                 return -EIO;
 318
 319
 320         xid = GetXid();
 321         if(pTcon) {
 322                 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
 323         } else {
 324                 return -EIO;
 325         }
 326
 327         FreeXid(xid);
 328         return rc;
 329 }
 330
 331 int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
 332                 struct fs_disk_quota * pdquota)
 333 {
 334         int xid;
 335         int rc = 0;
 336         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 337         struct cifsTconInfo *pTcon;
 338
 339         if(cifs_sb)
 340                 pTcon = cifs_sb->tcon;
 341         else
 342                 return -EIO;
 343
 344         xid = GetXid();
 345         if(pTcon) {
 346                 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
 347         } else {
 348                 rc = -EIO;
 349         }
 350
 351         FreeXid(xid);
 352         return rc;
 353 }
 354
 355 int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
 356 {
 357         int xid;
 358         int rc = 0;
 359         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 360         struct cifsTconInfo *pTcon;
 361
 362         if(cifs_sb)
 363                 pTcon = cifs_sb->tcon;
 364         else
 365                 return -EIO;
 366
 367         xid = GetXid();
 368         if(pTcon) {
 369                 cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
 370         } else {
 371                 rc = -EIO;
 372         }
 373
 374         FreeXid(xid);
 375         return rc;
 376 }
 377
 378 int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
 379 {
 380         int xid;
 381         int rc = 0;
 382         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 383         struct cifsTconInfo *pTcon;
 384
 385         if(cifs_sb) {
 386                 pTcon = cifs_sb->tcon;
 387         } else {
 388                 return -EIO;
 389         }
 390         xid = GetXid();
 391         if(pTcon) {
 392                 cFYI(1,("pqstats %p",qstats));
 393         } else {
 394                 rc = -EIO;
 395         }
 396
 397         FreeXid(xid);
 398         return rc;
 399 }
 400
 401 static struct quotactl_ops cifs_quotactl_ops = {
 402         .set_xquota     = cifs_xquota_set,
 403         .get_xquota     = cifs_xquota_set,
 404         .set_xstate     = cifs_xstate_set,
 405         .get_xstate     = cifs_xstate_get,
 406 };
 407 #endif
 408
 409 #ifdef CONFIG_CIFS_EXPERIMENTAL
 410 static void cifs_umount_begin(struct super_block * sblock)
 411 {
 412         struct cifs_sb_info *cifs_sb;
 413         struct cifsTconInfo * tcon;
 414
 415         cifs_sb = CIFS_SB(sblock);
 416         if(cifs_sb == NULL)
 417                 return;
 418
 419         tcon = cifs_sb->tcon;
 420         if(tcon == NULL)
 421                 return;
 422         down(&tcon->tconSem);
 423         if (atomic_read(&tcon->useCount) == 1)
 424                 tcon->tidStatus = CifsExiting;
 425         up(&tcon->tconSem);
 426
 427         /* cancel_brl_requests(tcon); */
 428         /* cancel_notify_requests(tcon); */
 429         if(tcon->ses && tcon->ses->server)
 430         {
 431                 cFYI(1,("wake up tasks now - umount begin not complete"));
 432                 wake_up_all(&tcon->ses->server->request_q);
 433                 wake_up_all(&tcon->ses->server->response_q);
 434                 msleep(1); /* yield */
 435                 /* we have to kick the requests once more */
 436                 wake_up_all(&tcon->ses->server->response_q);
 437                 msleep(1);
 438         }
 439 /* BB FIXME - finish add checks for tidStatus BB */
 440
 441         return;
 442 }
 443 #endif
 444
 445 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 446 {
 447         *flags |= MS_NODIRATIME;
 448         return 0;
 449 }
 450
 451 struct super_operations cifs_super_ops = {
 452         .read_inode = cifs_read_inode,
 453         .put_super = cifs_put_super,
 454         .statfs = cifs_statfs,
 455         .alloc_inode = cifs_alloc_inode,
 456         .destroy_inode = cifs_destroy_inode,
 457 /*      .drop_inode         = generic_delete_inode,
 458         .delete_inode   = cifs_delete_inode,  *//* Do not need the above two functions
 459    unless later we add lazy close of inodes or unless the kernel forgets to call
 460    us with the same number of releases (closes) as opens */
 461         .show_options = cifs_show_options,
 462 #ifdef CONFIG_CIFS_EXPERIMENTAL
 463         .umount_begin   = cifs_umount_begin,
 464 #endif
 465         .remount_fs = cifs_remount,
 466 };
 467
 468 static struct super_block *
 469 cifs_get_sb(struct file_system_type *fs_type,
 470             int flags, const char *dev_name, void *data)
 471 {
 472         int rc;
 473         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 474
 475         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 476
 477         if (IS_ERR(sb))
 478                 return sb;
 479
 480         sb->s_flags = flags;
 481
 482         rc = cifs_read_super(sb, data, dev_name, flags & MS_VERBOSE ? 1 : 0);
 483         if (rc) {
 484                 up_write(&sb->s_umount);
 485                 deactivate_super(sb);
 486                 return ERR_PTR(rc);
 487         }
 488         sb->s_flags |= MS_ACTIVE;
 489         return sb;
 490 }
 491
 492 static ssize_t cifs_file_writev(struct file *file, const struct iovec *iov,
 493                                 unsigned long nr_segs, loff_t *ppos)
 494 {
 495         struct inode *inode = file->f_dentry->d_inode;
 496         ssize_t written;
 497
 498         written = generic_file_writev(file, iov, nr_segs, ppos);
 499         if (!CIFS_I(inode)->clientCanCacheAll)
 500                 filemap_fdatawrite(inode->i_mapping);
 501         return written;
 502 }
 503
 504 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const char __user *buf,
 505                                    size_t count, loff_t pos)
 506 {
 507         struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
 508         ssize_t written;
 509
 510         written = generic_file_aio_write(iocb, buf, count, pos);
 511         if (!CIFS_I(inode)->clientCanCacheAll)
 512                 filemap_fdatawrite(inode->i_mapping);
 513         return written;
 514 }
 515
 516 static struct file_system_type cifs_fs_type = {
 517         .owner = THIS_MODULE,
 518         .name = "cifs",
 519         .get_sb = cifs_get_sb,
 520         .kill_sb = kill_anon_super,
 521         /*  .fs_flags */
 522 };
 523 struct inode_operations cifs_dir_inode_ops = {
 524         .create = cifs_create,
 525         .lookup = cifs_lookup,
 526         .getattr = cifs_getattr,
 527         .unlink = cifs_unlink,
 528         .link = cifs_hardlink,
 529         .mkdir = cifs_mkdir,
 530         .rmdir = cifs_rmdir,
 531         .rename = cifs_rename,
 532         .permission = cifs_permission,
 533 /*      revalidate:cifs_revalidate,   */
 534         .setattr = cifs_setattr,
 535         .symlink = cifs_symlink,
 536         .mknod   = cifs_mknod,
 537 #ifdef CONFIG_CIFS_XATTR
 538         .setxattr = cifs_setxattr,
 539         .getxattr = cifs_getxattr,
 540         .listxattr = cifs_listxattr,
 541         .removexattr = cifs_removexattr,
 542 #endif
 543 };
 544
 545 struct inode_operations cifs_file_inode_ops = {
 546 /*      revalidate:cifs_revalidate, */
 547         .setattr = cifs_setattr,
 548         .getattr = cifs_getattr, /* do we need this anymore? */
 549         .rename = cifs_rename,
 550         .permission = cifs_permission,
 551 #ifdef CONFIG_CIFS_XATTR
 552         .setxattr = cifs_setxattr,
 553         .getxattr = cifs_getxattr,
 554         .listxattr = cifs_listxattr,
 555         .removexattr = cifs_removexattr,
 556 #endif
 557 };
 558
 559 struct inode_operations cifs_symlink_inode_ops = {
 560         .readlink = generic_readlink,
 561         .follow_link = cifs_follow_link,
 562         .put_link = cifs_put_link,
 563         .permission = cifs_permission,
 564         /* BB add the following two eventually */
 565         /* revalidate: cifs_revalidate,
 566            setattr:    cifs_notify_change, *//* BB do we need notify change */
 567 #ifdef CONFIG_CIFS_XATTR
 568         .setxattr = cifs_setxattr,
 569         .getxattr = cifs_getxattr,
 570         .listxattr = cifs_listxattr,
 571         .removexattr = cifs_removexattr,
 572 #endif
 573 };
 574
 575 struct file_operations cifs_file_ops = {
 576         .read = do_sync_read,
 577         .write = do_sync_write,
 578         .readv = generic_file_readv,
 579         .writev = cifs_file_writev,
 580         .aio_read = generic_file_aio_read,
 581         .aio_write = cifs_file_aio_write,
 582         .open = cifs_open,
 583         .release = cifs_close,
 584         .lock = cifs_lock,
 585         .fsync = cifs_fsync,
 586         .flush = cifs_flush,
 587         .mmap  = cifs_file_mmap,
 588         .sendfile = generic_file_sendfile,
 589 #ifdef CONFIG_CIFS_POSIX
 590         .ioctl  = cifs_ioctl,
 591 #endif /* CONFIG_CIFS_POSIX */
 592
 593 #ifdef CONFIG_CIFS_EXPERIMENTAL
 594         .dir_notify = cifs_dir_notify,
 595 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 596 };
 597
 598 struct file_operations cifs_file_direct_ops = {
 599         /* no mmap, no aio, no readv -
 600            BB reevaluate whether they can be done with directio, no cache */
 601         .read = cifs_user_read,
 602         .write = cifs_user_write,
 603         .open = cifs_open,
 604         .release = cifs_close,
 605         .lock = cifs_lock,
 606         .fsync = cifs_fsync,
 607         .flush = cifs_flush,
 608         .sendfile = generic_file_sendfile, /* BB removeme BB */
 609 #ifdef CONFIG_CIFS_POSIX
 610         .ioctl  = cifs_ioctl,
 611 #endif /* CONFIG_CIFS_POSIX */
 612
 613 #ifdef CONFIG_CIFS_EXPERIMENTAL
 614         .dir_notify = cifs_dir_notify,
 615 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 616 };
 617 struct file_operations cifs_file_nobrl_ops = {
 618         .read = do_sync_read,
 619         .write = do_sync_write,
 620         .readv = generic_file_readv,
 621         .writev = cifs_file_writev,
 622         .aio_read = generic_file_aio_read,
 623         .aio_write = cifs_file_aio_write,
 624         .open = cifs_open,
 625         .release = cifs_close,
 626         .fsync = cifs_fsync,
 627         .flush = cifs_flush,
 628         .mmap  = cifs_file_mmap,
 629         .sendfile = generic_file_sendfile,
 630 #ifdef CONFIG_CIFS_POSIX
 631         .ioctl  = cifs_ioctl,
 632 #endif /* CONFIG_CIFS_POSIX */
 633
 634 #ifdef CONFIG_CIFS_EXPERIMENTAL
 635         .dir_notify = cifs_dir_notify,
 636 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 637 };
 638
 639 struct file_operations cifs_file_direct_nobrl_ops = {
 640         /* no mmap, no aio, no readv -
 641            BB reevaluate whether they can be done with directio, no cache */
 642         .read = cifs_user_read,
 643         .write = cifs_user_write,
 644         .open = cifs_open,
 645         .release = cifs_close,
 646         .fsync = cifs_fsync,
 647         .flush = cifs_flush,
 648         .sendfile = generic_file_sendfile, /* BB removeme BB */
 649 #ifdef CONFIG_CIFS_POSIX
 650         .ioctl  = cifs_ioctl,
 651 #endif /* CONFIG_CIFS_POSIX */
 652
 653 #ifdef CONFIG_CIFS_EXPERIMENTAL
 654         .dir_notify = cifs_dir_notify,
 655 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 656 };
 657
 658 struct file_operations cifs_dir_ops = {
 659         .readdir = cifs_readdir,
 660         .release = cifs_closedir,
 661         .read    = generic_read_dir,
 662 #ifdef CONFIG_CIFS_EXPERIMENTAL
 663         .dir_notify = cifs_dir_notify,
 664 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 665         .ioctl  = cifs_ioctl,
 666 };
 667
 668 static void
 669 cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags)
 670 {
 671         struct cifsInodeInfo *cifsi = inode;
 672
 673         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 674             SLAB_CTOR_CONSTRUCTOR) {
 675                 inode_init_once(&cifsi->vfs_inode);
 676                 INIT_LIST_HEAD(&cifsi->lockList);
 677         }
 678 }
 679
 680 static int
 681 cifs_init_inodecache(void)
 682 {
 683         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 684                                               sizeof (struct cifsInodeInfo),
 685                                               0, SLAB_RECLAIM_ACCOUNT,
 686                                               cifs_init_once, NULL);
 687         if (cifs_inode_cachep == NULL)
 688                 return -ENOMEM;
 689
 690         return 0;
 691 }
 692
 693 static void
 694 cifs_destroy_inodecache(void)
 695 {
 696         if (kmem_cache_destroy(cifs_inode_cachep))
 697                 printk(KERN_WARNING "cifs_inode_cache: error freeing\n");
 698 }
 699
 700 static int
 701 cifs_init_request_bufs(void)
 702 {
 703         if(CIFSMaxBufSize < 8192) {
 704         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 705         Unicode path name has to fit in any SMB/CIFS path based frames */
 706                 CIFSMaxBufSize = 8192;
 707         } else if (CIFSMaxBufSize > 1024*127) {
 708                 CIFSMaxBufSize = 1024 * 127;
 709         } else {
 710                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 711         }
 712 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 713         cifs_req_cachep = kmem_cache_create("cifs_request",
 714                                             CIFSMaxBufSize +
 715                                             MAX_CIFS_HDR_SIZE, 0,
 716                                             SLAB_HWCACHE_ALIGN, NULL, NULL);
 717         if (cifs_req_cachep == NULL)
 718                 return -ENOMEM;
 719
 720         if(cifs_min_rcv < 1)
 721                 cifs_min_rcv = 1;
 722         else if (cifs_min_rcv > 64) {
 723                 cifs_min_rcv = 64;
 724                 cERROR(1,("cifs_min_rcv set to maximum (64)"));
 725         }
 726
 727         cifs_req_poolp = mempool_create(cifs_min_rcv,
 728                                         mempool_alloc_slab,
 729                                         mempool_free_slab,
 730                                         cifs_req_cachep);
 731
 732         if(cifs_req_poolp == NULL) {
 733                 kmem_cache_destroy(cifs_req_cachep);
 734                 return -ENOMEM;
 735         }
 736         /* 256 (MAX_CIFS_HDR_SIZE bytes is enough for most SMB responses and
 737         almost all handle based requests (but not write response, nor is it
 738         sufficient for path based requests).  A smaller size would have
 739         been more efficient (compacting multiple slab items on one 4k page)
 740         for the case in which debug was on, but this larger size allows
 741         more SMBs to use small buffer alloc and is still much more
 742         efficient to alloc 1 per page off the slab compared to 17K (5page)
 743         alloc of large cifs buffers even when page debugging is on */
 744         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 745                         MAX_CIFS_HDR_SIZE, 0, SLAB_HWCACHE_ALIGN, NULL, NULL);
 746         if (cifs_sm_req_cachep == NULL) {
 747                 mempool_destroy(cifs_req_poolp);
 748                 kmem_cache_destroy(cifs_req_cachep);
 749                 return -ENOMEM;
 750         }
 751
 752         if(cifs_min_small < 2)
 753                 cifs_min_small = 2;
 754         else if (cifs_min_small > 256) {
 755                 cifs_min_small = 256;
 756                 cFYI(1,("cifs_min_small set to maximum (256)"));
 757         }
 758
 759         cifs_sm_req_poolp = mempool_create(cifs_min_small,
 760                                 mempool_alloc_slab,
 761                                 mempool_free_slab,
 762                                 cifs_sm_req_cachep);
 763
 764         if(cifs_sm_req_poolp == NULL) {
 765                 mempool_destroy(cifs_req_poolp);
 766                 kmem_cache_destroy(cifs_req_cachep);
 767                 kmem_cache_destroy(cifs_sm_req_cachep);
 768                 return -ENOMEM;
 769         }
 770
 771         return 0;
 772 }
 773
 774 static void
 775 cifs_destroy_request_bufs(void)
 776 {
 777         mempool_destroy(cifs_req_poolp);
 778         if (kmem_cache_destroy(cifs_req_cachep))
 779                 printk(KERN_WARNING
 780                        "cifs_destroy_request_cache: error not all structures were freed\n");
 781         mempool_destroy(cifs_sm_req_poolp);
 782         if (kmem_cache_destroy(cifs_sm_req_cachep))
 783                 printk(KERN_WARNING
 784                       "cifs_destroy_request_cache: cifs_small_rq free error\n");
 785 }
 786
 787 static int
 788 cifs_init_mids(void)
 789 {
 790         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 791                                 sizeof (struct mid_q_entry), 0,
 792                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 793         if (cifs_mid_cachep == NULL)
 794                 return -ENOMEM;
 795
 796         cifs_mid_poolp = mempool_create(3 /* a reasonable min simultan opers */,
 797                                         mempool_alloc_slab,
 798                                         mempool_free_slab,
 799                                         cifs_mid_cachep);
 800         if(cifs_mid_poolp == NULL) {
 801                 kmem_cache_destroy(cifs_mid_cachep);
 802                 return -ENOMEM;
 803         }
 804
 805         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 806                                 sizeof (struct oplock_q_entry), 0,
 807                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 808         if (cifs_oplock_cachep == NULL) {
 809                 kmem_cache_destroy(cifs_mid_cachep);
 810                 mempool_destroy(cifs_mid_poolp);
 811                 return -ENOMEM;
 812         }
 813
 814         return 0;
 815 }
 816
 817 static void
 818 cifs_destroy_mids(void)
 819 {
 820         mempool_destroy(cifs_mid_poolp);
 821         if (kmem_cache_destroy(cifs_mid_cachep))
 822                 printk(KERN_WARNING
 823                        "cifs_destroy_mids: error not all structures were freed\n");
 824
 825         if (kmem_cache_destroy(cifs_oplock_cachep))
 826                 printk(KERN_WARNING
 827                        "error not all oplock structures were freed\n");
 828 }
 829
 830 static int cifs_oplock_thread(void * dummyarg)
 831 {
 832         struct oplock_q_entry * oplock_item;
 833         struct cifsTconInfo *pTcon;
 834         struct inode * inode;
 835         __u16  netfid;
 836         int rc;
 837
 838         daemonize("cifsoplockd");
 839         allow_signal(SIGTERM);
 840
 841         oplockThread = current;
 842         do {
 843                 if (try_to_freeze())
 844                         continue;
 845
 846                 spin_lock(&GlobalMid_Lock);
 847                 if(list_empty(&GlobalOplock_Q)) {
 848                         spin_unlock(&GlobalMid_Lock);
 849                         set_current_state(TASK_INTERRUPTIBLE);
 850                         schedule_timeout(39*HZ);
 851                 } else {
 852                         oplock_item = list_entry(GlobalOplock_Q.next,
 853                                 struct oplock_q_entry, qhead);
 854                         if(oplock_item) {
 855                                 cFYI(1,("found oplock item to write out"));
 856                                 pTcon = oplock_item->tcon;
 857                                 inode = oplock_item->pinode;
 858                                 netfid = oplock_item->netfid;
 859                                 spin_unlock(&GlobalMid_Lock);
 860                                 DeleteOplockQEntry(oplock_item);
 861                                 /* can not grab inode sem here since it would
 862                                 deadlock when oplock received on delete
 863                                 since vfs_unlink holds the i_mutex across
 864                                 the call */
 865                                 /* mutex_lock(&inode->i_mutex);*/
 866                                 if (S_ISREG(inode->i_mode)) {
 867                                         rc = filemap_fdatawrite(inode->i_mapping);
 868                                         if(CIFS_I(inode)->clientCanCacheRead == 0) {
 869                                                 filemap_fdatawait(inode->i_mapping);
 870                                                 invalidate_remote_inode(inode);
 871                                         }
 872                                 } else
 873                                         rc = 0;
 874                                 /* mutex_unlock(&inode->i_mutex);*/
 875                                 if (rc)
 876                                         CIFS_I(inode)->write_behind_rc = rc;
 877                                 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
 878
 879                                 /* releasing a stale oplock after recent reconnection
 880                                 of smb session using a now incorrect file
 881                                 handle is not a data integrity issue but do
 882                                 not bother sending an oplock release if session
 883                                 to server still is disconnected since oplock
 884                                 already released by the server in that case */
 885                                 if(pTcon->tidStatus != CifsNeedReconnect) {
 886                                     rc = CIFSSMBLock(0, pTcon, netfid,
 887                                             0 /* len */ , 0 /* offset */, 0,
 888                                             0, LOCKING_ANDX_OPLOCK_RELEASE,
 889                                             0 /* wait flag */);
 890                                         cFYI(1,("Oplock release rc = %d ",rc));
 891                                 }
 892                         } else
 893                                 spin_unlock(&GlobalMid_Lock);
 894                         set_current_state(TASK_INTERRUPTIBLE);
 895                         schedule_timeout(1);  /* yield in case q were corrupt */
 896                 }
 897         } while(!signal_pending(current));
 898         oplockThread = NULL;
 899         complete_and_exit (&cifs_oplock_exited, 0);
 900 }
 901
 902 static int cifs_dnotify_thread(void * dummyarg)
 903 {
 904         struct list_head *tmp;
 905         struct cifsSesInfo *ses;
 906
 907         daemonize("cifsdnotifyd");
 908         allow_signal(SIGTERM);
 909
 910         dnotifyThread = current;
 911         do {
 912                 if(try_to_freeze())
 913                         continue;
 914                 set_current_state(TASK_INTERRUPTIBLE);
 915                 schedule_timeout(15*HZ);
 916                 read_lock(&GlobalSMBSeslock);
 917                 /* check if any stuck requests that need
 918                    to be woken up and wakeq so the
 919                    thread can wake up and error out */
 920                 list_for_each(tmp, &GlobalSMBSessionList) {
 921                         ses = list_entry(tmp, struct cifsSesInfo,
 922                                 cifsSessionList);
 923                         if(ses && ses->server &&
 924                              atomic_read(&ses->server->inFlight))
 925                                 wake_up_all(&ses->server->response_q);
 926                 }
 927                 read_unlock(&GlobalSMBSeslock);
 928         } while(!signal_pending(current));
 929         complete_and_exit (&cifs_dnotify_exited, 0);
 930 }
 931
 932 static int __init
 933 init_cifs(void)
 934 {
 935         int rc = 0;
 936 #ifdef CONFIG_PROC_FS
 937         cifs_proc_init();
 938 #endif
 939         INIT_LIST_HEAD(&GlobalServerList);      /* BB not implemented yet */
 940         INIT_LIST_HEAD(&GlobalSMBSessionList);
 941         INIT_LIST_HEAD(&GlobalTreeConnectionList);
 942         INIT_LIST_HEAD(&GlobalOplock_Q);
 943 #ifdef CONFIG_CIFS_EXPERIMENTAL
 944         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 945         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 946 #endif
 947 /*
 948  *  Initialize Global counters
 949  */
 950         atomic_set(&sesInfoAllocCount, 0);
 951         atomic_set(&tconInfoAllocCount, 0);
 952         atomic_set(&tcpSesAllocCount,0);
 953         atomic_set(&tcpSesReconnectCount, 0);
 954         atomic_set(&tconInfoReconnectCount, 0);
 955
 956         atomic_set(&bufAllocCount, 0);
 957         atomic_set(&midCount, 0);
 958         GlobalCurrentXid = 0;
 959         GlobalTotalActiveXid = 0;
 960         GlobalMaxActiveXid = 0;
 961         rwlock_init(&GlobalSMBSeslock);
 962         spin_lock_init(&GlobalMid_Lock);
 963
 964         if(cifs_max_pending < 2) {
 965                 cifs_max_pending = 2;
 966                 cFYI(1,("cifs_max_pending set to min of 2"));
 967         } else if(cifs_max_pending > 256) {
 968                 cifs_max_pending = 256;
 969                 cFYI(1,("cifs_max_pending set to max of 256"));
 970         }
 971
 972         rc = cifs_init_inodecache();
 973         if (!rc) {
 974                 rc = cifs_init_mids();
 975                 if (!rc) {
 976                         rc = cifs_init_request_bufs();
 977                         if (!rc) {
 978                                 rc = register_filesystem(&cifs_fs_type);
 979                                 if (!rc) {
 980                                         rc = (int)kernel_thread(cifs_oplock_thread, NULL,
 981                                                 CLONE_FS | CLONE_FILES | CLONE_VM);
 982                                         if(rc > 0) {
 983                                                 rc = (int)kernel_thread(cifs_dnotify_thread, NULL,
 984                                                         CLONE_FS | CLONE_FILES | CLONE_VM);
 985                                                 if(rc > 0)
 986                                                         return 0;
 987                                                 else
 988                                                         cERROR(1,("error %d create dnotify thread", rc));
 989                                         } else {
 990                                                 cERROR(1,("error %d create oplock thread",rc));
 991                                         }
 992                                 }
 993                                 cifs_destroy_request_bufs();
 994                         }
 995                         cifs_destroy_mids();
 996                 }
 997                 cifs_destroy_inodecache();
 998         }
 999 #ifdef CONFIG_PROC_FS
1000         cifs_proc_clean();
1001 #endif
1002         return rc;
1003 }
1004
1005 static void __exit
1006 exit_cifs(void)
1007 {
1008         cFYI(0, ("In unregister ie exit_cifs"));
1009 #ifdef CONFIG_PROC_FS
1010         cifs_proc_clean();
1011 #endif
1012         unregister_filesystem(&cifs_fs_type);
1013         cifs_destroy_inodecache();
1014         cifs_destroy_mids();
1015         cifs_destroy_request_bufs();
1016         if(oplockThread) {
1017                 send_sig(SIGTERM, oplockThread, 1);
1018                 wait_for_completion(&cifs_oplock_exited);
1019         }
1020         if(dnotifyThread) {
1021                 send_sig(SIGTERM, dnotifyThread, 1);
1022                 wait_for_completion(&cifs_dnotify_exited);
1023         }
1024 }
1025
1026 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1027 MODULE_LICENSE("GPL");          /* combination of LGPL + GPL source behaves as GPL */
1028 MODULE_DESCRIPTION
1029     ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
1030 MODULE_VERSION(CIFS_VERSION);
1031 module_init(init_cifs)
1032 module_exit(exit_cifs)