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