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   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 static void cifs_umount_begin(struct super_block * sblock)
 409 {
 410         cERROR(1,("kill all tasks now - umount begin not implemented yet"));
 411
 412 /* BB FIXME - finish BB */
 413
 414         return;
 415 }
 416
 417
 418 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 419 {
 420         *flags |= MS_NODIRATIME;
 421         return 0;
 422 }
 423
 424 struct super_operations cifs_super_ops = {
 425         .read_inode = cifs_read_inode,
 426         .put_super = cifs_put_super,
 427         .statfs = cifs_statfs,
 428         .alloc_inode = cifs_alloc_inode,
 429         .destroy_inode = cifs_destroy_inode,
 430 /*      .drop_inode         = generic_delete_inode,
 431         .delete_inode   = cifs_delete_inode,  *//* Do not need the above two functions
 432    unless later we add lazy close of inodes or unless the kernel forgets to call
 433    us with the same number of releases (closes) as opens */
 434         .show_options = cifs_show_options,
 435 /*      .umount_begin   = cifs_umount_begin, */ /* BB finish in the future */
 436         .remount_fs = cifs_remount,
 437 };
 438
 439 static struct super_block *
 440 cifs_get_sb(struct file_system_type *fs_type,
 441             int flags, const char *dev_name, void *data)
 442 {
 443         int rc;
 444         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 445
 446         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 447
 448         if (IS_ERR(sb))
 449                 return sb;
 450
 451         sb->s_flags = flags;
 452
 453         rc = cifs_read_super(sb, data, dev_name, flags & MS_VERBOSE ? 1 : 0);
 454         if (rc) {
 455                 up_write(&sb->s_umount);
 456                 deactivate_super(sb);
 457                 return ERR_PTR(rc);
 458         }
 459         sb->s_flags |= MS_ACTIVE;
 460         return sb;
 461 }
 462
 463 static ssize_t
 464 cifs_read_wrapper(struct file * file, char __user *read_data, size_t read_size,
 465           loff_t * poffset)
 466 {
 467         if(file->f_dentry == NULL)
 468                 return -EIO;
 469         else if(file->f_dentry->d_inode == NULL)
 470                 return -EIO;
 471
 472         cFYI(1,("In read_wrapper size %zd at %lld",read_size,*poffset));
 473
 474         if(CIFS_I(file->f_dentry->d_inode)->clientCanCacheRead) {
 475                 return generic_file_read(file,read_data,read_size,poffset);
 476         } else {
 477                 /* BB do we need to lock inode from here until after invalidate? */
 478 /*              if(file->f_dentry->d_inode->i_mapping) {
 479                         filemap_fdatawrite(file->f_dentry->d_inode->i_mapping);
 480                         filemap_fdatawait(file->f_dentry->d_inode->i_mapping);
 481                 }*/
 482 /*              cifs_revalidate(file->f_dentry);*/ /* BB fixme */
 483
 484                 /* BB we should make timer configurable - perhaps
 485                    by simply calling cifs_revalidate here */
 486                 /* invalidate_remote_inode(file->f_dentry->d_inode);*/
 487                 return generic_file_read(file,read_data,read_size,poffset);
 488         }
 489 }
 490
 491 static ssize_t
 492 cifs_write_wrapper(struct file * file, const char __user *write_data,
 493            size_t write_size, loff_t * poffset)
 494 {
 495         ssize_t written;
 496
 497         if(file->f_dentry == NULL)
 498                 return -EIO;
 499         else if(file->f_dentry->d_inode == NULL)
 500                 return -EIO;
 501
 502         cFYI(1,("In write_wrapper size %zd at %lld",write_size,*poffset));
 503
 504         written = generic_file_write(file,write_data,write_size,poffset);
 505         if(!CIFS_I(file->f_dentry->d_inode)->clientCanCacheAll)  {
 506                 if(file->f_dentry->d_inode->i_mapping) {
 507                         filemap_fdatawrite(file->f_dentry->d_inode->i_mapping);
 508                 }
 509         }
 510         return written;
 511 }
 512
 513
 514 static struct file_system_type cifs_fs_type = {
 515         .owner = THIS_MODULE,
 516         .name = "cifs",
 517         .get_sb = cifs_get_sb,
 518         .kill_sb = kill_anon_super,
 519         /*  .fs_flags */
 520 };
 521 struct inode_operations cifs_dir_inode_ops = {
 522         .create = cifs_create,
 523         .lookup = cifs_lookup,
 524         .getattr = cifs_getattr,
 525         .unlink = cifs_unlink,
 526         .link = cifs_hardlink,
 527         .mkdir = cifs_mkdir,
 528         .rmdir = cifs_rmdir,
 529         .rename = cifs_rename,
 530         .permission = cifs_permission,
 531 /*      revalidate:cifs_revalidate,   */
 532         .setattr = cifs_setattr,
 533         .symlink = cifs_symlink,
 534         .mknod   = cifs_mknod,
 535 #ifdef CONFIG_CIFS_XATTR
 536         .setxattr = cifs_setxattr,
 537         .getxattr = cifs_getxattr,
 538         .listxattr = cifs_listxattr,
 539         .removexattr = cifs_removexattr,
 540 #endif
 541 };
 542
 543 struct inode_operations cifs_file_inode_ops = {
 544 /*      revalidate:cifs_revalidate, */
 545         .setattr = cifs_setattr,
 546         .getattr = cifs_getattr, /* do we need this anymore? */
 547         .rename = cifs_rename,
 548         .permission = cifs_permission,
 549 #ifdef CONFIG_CIFS_XATTR
 550         .setxattr = cifs_setxattr,
 551         .getxattr = cifs_getxattr,
 552         .listxattr = cifs_listxattr,
 553         .removexattr = cifs_removexattr,
 554 #endif
 555 };
 556
 557 struct inode_operations cifs_symlink_inode_ops = {
 558         .readlink = generic_readlink,
 559         .follow_link = cifs_follow_link,
 560         .put_link = cifs_put_link,
 561         .permission = cifs_permission,
 562         /* BB add the following two eventually */
 563         /* revalidate: cifs_revalidate,
 564            setattr:    cifs_notify_change, *//* BB do we need notify change */
 565 #ifdef CONFIG_CIFS_XATTR
 566         .setxattr = cifs_setxattr,
 567         .getxattr = cifs_getxattr,
 568         .listxattr = cifs_listxattr,
 569         .removexattr = cifs_removexattr,
 570 #endif
 571 };
 572
 573 struct file_operations cifs_file_ops = {
 574         .read = cifs_read_wrapper,
 575         .write = cifs_write_wrapper,
 576         .open = cifs_open,
 577         .release = cifs_close,
 578         .lock = cifs_lock,
 579         .fsync = cifs_fsync,
 580         .flush = cifs_flush,
 581         .mmap  = cifs_file_mmap,
 582         .sendfile = generic_file_sendfile,
 583 #ifdef CONFIG_CIFS_POSIX
 584         .ioctl  = cifs_ioctl,
 585 #endif /* CONFIG_CIFS_POSIX */
 586
 587 #ifdef CONFIG_CIFS_EXPERIMENTAL
 588         .readv = generic_file_readv,
 589         .writev = generic_file_writev,
 590         .aio_read = generic_file_aio_read,
 591         .aio_write = generic_file_aio_write,
 592         .dir_notify = cifs_dir_notify,
 593 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 594 };
 595
 596 struct file_operations cifs_file_direct_ops = {
 597         /* no mmap, no aio, no readv -
 598            BB reevaluate whether they can be done with directio, no cache */
 599         .read = cifs_user_read,
 600         .write = cifs_user_write,
 601         .open = cifs_open,
 602         .release = cifs_close,
 603         .lock = cifs_lock,
 604         .fsync = cifs_fsync,
 605         .flush = cifs_flush,
 606         .sendfile = generic_file_sendfile, /* BB removeme BB */
 607 #ifdef CONFIG_CIFS_POSIX
 608         .ioctl  = cifs_ioctl,
 609 #endif /* CONFIG_CIFS_POSIX */
 610
 611 #ifdef CONFIG_CIFS_EXPERIMENTAL
 612         .dir_notify = cifs_dir_notify,
 613 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 614 };
 615
 616 struct file_operations cifs_dir_ops = {
 617         .readdir = cifs_readdir,
 618         .release = cifs_closedir,
 619         .read    = generic_read_dir,
 620 #ifdef CONFIG_CIFS_EXPERIMENTAL
 621         .dir_notify = cifs_dir_notify,
 622 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 623         .ioctl  = cifs_ioctl,
 624 };
 625
 626 static void
 627 cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags)
 628 {
 629         struct cifsInodeInfo *cifsi = inode;
 630
 631         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 632             SLAB_CTOR_CONSTRUCTOR) {
 633                 inode_init_once(&cifsi->vfs_inode);
 634                 INIT_LIST_HEAD(&cifsi->lockList);
 635         }
 636 }
 637
 638 static int
 639 cifs_init_inodecache(void)
 640 {
 641         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 642                                               sizeof (struct cifsInodeInfo),
 643                                               0, SLAB_RECLAIM_ACCOUNT,
 644                                               cifs_init_once, NULL);
 645         if (cifs_inode_cachep == NULL)
 646                 return -ENOMEM;
 647
 648         return 0;
 649 }
 650
 651 static void
 652 cifs_destroy_inodecache(void)
 653 {
 654         if (kmem_cache_destroy(cifs_inode_cachep))
 655                 printk(KERN_WARNING "cifs_inode_cache: error freeing\n");
 656 }
 657
 658 static int
 659 cifs_init_request_bufs(void)
 660 {
 661         if(CIFSMaxBufSize < 8192) {
 662         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 663         Unicode path name has to fit in any SMB/CIFS path based frames */
 664                 CIFSMaxBufSize = 8192;
 665         } else if (CIFSMaxBufSize > 1024*127) {
 666                 CIFSMaxBufSize = 1024 * 127;
 667         } else {
 668                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 669         }
 670 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 671         cifs_req_cachep = kmem_cache_create("cifs_request",
 672                                             CIFSMaxBufSize +
 673                                             MAX_CIFS_HDR_SIZE, 0,
 674                                             SLAB_HWCACHE_ALIGN, NULL, NULL);
 675         if (cifs_req_cachep == NULL)
 676                 return -ENOMEM;
 677
 678         if(cifs_min_rcv < 1)
 679                 cifs_min_rcv = 1;
 680         else if (cifs_min_rcv > 64) {
 681                 cifs_min_rcv = 64;
 682                 cERROR(1,("cifs_min_rcv set to maximum (64)"));
 683         }
 684
 685         cifs_req_poolp = mempool_create(cifs_min_rcv,
 686                                         mempool_alloc_slab,
 687                                         mempool_free_slab,
 688                                         cifs_req_cachep);
 689
 690         if(cifs_req_poolp == NULL) {
 691                 kmem_cache_destroy(cifs_req_cachep);
 692                 return -ENOMEM;
 693         }
 694         /* 256 (MAX_CIFS_HDR_SIZE bytes is enough for most SMB responses and
 695         almost all handle based requests (but not write response, nor is it
 696         sufficient for path based requests).  A smaller size would have
 697         been more efficient (compacting multiple slab items on one 4k page)
 698         for the case in which debug was on, but this larger size allows
 699         more SMBs to use small buffer alloc and is still much more
 700         efficient to alloc 1 per page off the slab compared to 17K (5page)
 701         alloc of large cifs buffers even when page debugging is on */
 702         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 703                         MAX_CIFS_HDR_SIZE, 0, SLAB_HWCACHE_ALIGN, NULL, NULL);
 704         if (cifs_sm_req_cachep == NULL) {
 705                 mempool_destroy(cifs_req_poolp);
 706                 kmem_cache_destroy(cifs_req_cachep);
 707                 return -ENOMEM;
 708         }
 709
 710         if(cifs_min_small < 2)
 711                 cifs_min_small = 2;
 712         else if (cifs_min_small > 256) {
 713                 cifs_min_small = 256;
 714                 cFYI(1,("cifs_min_small set to maximum (256)"));
 715         }
 716
 717         cifs_sm_req_poolp = mempool_create(cifs_min_small,
 718                                 mempool_alloc_slab,
 719                                 mempool_free_slab,
 720                                 cifs_sm_req_cachep);
 721
 722         if(cifs_sm_req_poolp == NULL) {
 723                 mempool_destroy(cifs_req_poolp);
 724                 kmem_cache_destroy(cifs_req_cachep);
 725                 kmem_cache_destroy(cifs_sm_req_cachep);
 726                 return -ENOMEM;
 727         }
 728
 729         return 0;
 730 }
 731
 732 static void
 733 cifs_destroy_request_bufs(void)
 734 {
 735         mempool_destroy(cifs_req_poolp);
 736         if (kmem_cache_destroy(cifs_req_cachep))
 737                 printk(KERN_WARNING
 738                        "cifs_destroy_request_cache: error not all structures were freed\n");
 739         mempool_destroy(cifs_sm_req_poolp);
 740         if (kmem_cache_destroy(cifs_sm_req_cachep))
 741                 printk(KERN_WARNING
 742                       "cifs_destroy_request_cache: cifs_small_rq free error\n");
 743 }
 744
 745 static int
 746 cifs_init_mids(void)
 747 {
 748         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 749                                 sizeof (struct mid_q_entry), 0,
 750                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 751         if (cifs_mid_cachep == NULL)
 752                 return -ENOMEM;
 753
 754         cifs_mid_poolp = mempool_create(3 /* a reasonable min simultan opers */,
 755                                         mempool_alloc_slab,
 756                                         mempool_free_slab,
 757                                         cifs_mid_cachep);
 758         if(cifs_mid_poolp == NULL) {
 759                 kmem_cache_destroy(cifs_mid_cachep);
 760                 return -ENOMEM;
 761         }
 762
 763         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 764                                 sizeof (struct oplock_q_entry), 0,
 765                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 766         if (cifs_oplock_cachep == NULL) {
 767                 kmem_cache_destroy(cifs_mid_cachep);
 768                 mempool_destroy(cifs_mid_poolp);
 769                 return -ENOMEM;
 770         }
 771
 772         return 0;
 773 }
 774
 775 static void
 776 cifs_destroy_mids(void)
 777 {
 778         mempool_destroy(cifs_mid_poolp);
 779         if (kmem_cache_destroy(cifs_mid_cachep))
 780                 printk(KERN_WARNING
 781                        "cifs_destroy_mids: error not all structures were freed\n");
 782
 783         if (kmem_cache_destroy(cifs_oplock_cachep))
 784                 printk(KERN_WARNING
 785                        "error not all oplock structures were freed\n");
 786 }
 787
 788 static int cifs_oplock_thread(void * dummyarg)
 789 {
 790         struct oplock_q_entry * oplock_item;
 791         struct cifsTconInfo *pTcon;
 792         struct inode * inode;
 793         __u16  netfid;
 794         int rc;
 795
 796         daemonize("cifsoplockd");
 797         allow_signal(SIGTERM);
 798
 799         oplockThread = current;
 800         do {
 801                 if(try_to_freeze())
 802                         continue;
 803
 804                 spin_lock(&GlobalMid_Lock);
 805                 if(list_empty(&GlobalOplock_Q)) {
 806                         spin_unlock(&GlobalMid_Lock);
 807                         set_current_state(TASK_INTERRUPTIBLE);
 808                         schedule_timeout(39*HZ);
 809                 } else {
 810                         oplock_item = list_entry(GlobalOplock_Q.next,
 811                                 struct oplock_q_entry, qhead);
 812                         if(oplock_item) {
 813                                 cFYI(1,("found oplock item to write out"));
 814                                 pTcon = oplock_item->tcon;
 815                                 inode = oplock_item->pinode;
 816                                 netfid = oplock_item->netfid;
 817                                 spin_unlock(&GlobalMid_Lock);
 818                                 DeleteOplockQEntry(oplock_item);
 819                                 /* can not grab inode sem here since it would
 820                                 deadlock when oplock received on delete
 821                                 since vfs_unlink holds the i_sem across
 822                                 the call */
 823                                 /* down(&inode->i_sem);*/
 824                                 if (S_ISREG(inode->i_mode)) {
 825                                         rc = filemap_fdatawrite(inode->i_mapping);
 826                                         if(CIFS_I(inode)->clientCanCacheRead == 0) {
 827                                                 filemap_fdatawait(inode->i_mapping);
 828                                                 invalidate_remote_inode(inode);
 829                                         }
 830                                 } else
 831                                         rc = 0;
 832                                 /* up(&inode->i_sem);*/
 833                                 if (rc)
 834                                         CIFS_I(inode)->write_behind_rc = rc;
 835                                 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
 836
 837                                 /* releasing a stale oplock after recent reconnection
 838                                 of smb session using a now incorrect file
 839                                 handle is not a data integrity issue but do
 840                                 not bother sending an oplock release if session
 841                                 to server still is disconnected since oplock
 842                                 already released by the server in that case */
 843                                 if(pTcon->tidStatus != CifsNeedReconnect) {
 844                                     rc = CIFSSMBLock(0, pTcon, netfid,
 845                                             0 /* len */ , 0 /* offset */, 0,
 846                                             0, LOCKING_ANDX_OPLOCK_RELEASE,
 847                                             0 /* wait flag */);
 848                                         cFYI(1,("Oplock release rc = %d ",rc));
 849                                 }
 850                         } else
 851                                 spin_unlock(&GlobalMid_Lock);
 852                         set_current_state(TASK_INTERRUPTIBLE);
 853                         schedule_timeout(1);  /* yield in case q were corrupt */
 854                 }
 855         } while(!signal_pending(current));
 856         oplockThread = NULL;
 857         complete_and_exit (&cifs_oplock_exited, 0);
 858 }
 859
 860 static int cifs_dnotify_thread(void * dummyarg)
 861 {
 862         daemonize("cifsdnotifyd");
 863         allow_signal(SIGTERM);
 864
 865         dnotifyThread = current;
 866         do {
 867                 if(try_to_freeze())
 868                         continue;
 869                 set_current_state(TASK_INTERRUPTIBLE);
 870                 schedule_timeout(39*HZ);
 871         } while(!signal_pending(current));
 872         complete_and_exit (&cifs_dnotify_exited, 0);
 873 }
 874
 875 static int __init
 876 init_cifs(void)
 877 {
 878         int rc = 0;
 879 #ifdef CONFIG_PROC_FS
 880         cifs_proc_init();
 881 #endif
 882         INIT_LIST_HEAD(&GlobalServerList);      /* BB not implemented yet */
 883         INIT_LIST_HEAD(&GlobalSMBSessionList);
 884         INIT_LIST_HEAD(&GlobalTreeConnectionList);
 885         INIT_LIST_HEAD(&GlobalOplock_Q);
 886 /*
 887  *  Initialize Global counters
 888  */
 889         atomic_set(&sesInfoAllocCount, 0);
 890         atomic_set(&tconInfoAllocCount, 0);
 891         atomic_set(&tcpSesAllocCount,0);
 892         atomic_set(&tcpSesReconnectCount, 0);
 893         atomic_set(&tconInfoReconnectCount, 0);
 894
 895         atomic_set(&bufAllocCount, 0);
 896         atomic_set(&midCount, 0);
 897         GlobalCurrentXid = 0;
 898         GlobalTotalActiveXid = 0;
 899         GlobalMaxActiveXid = 0;
 900         rwlock_init(&GlobalSMBSeslock);
 901         spin_lock_init(&GlobalMid_Lock);
 902
 903         if(cifs_max_pending < 2) {
 904                 cifs_max_pending = 2;
 905                 cFYI(1,("cifs_max_pending set to min of 2"));
 906         } else if(cifs_max_pending > 256) {
 907                 cifs_max_pending = 256;
 908                 cFYI(1,("cifs_max_pending set to max of 256"));
 909         }
 910
 911         rc = cifs_init_inodecache();
 912         if (!rc) {
 913                 rc = cifs_init_mids();
 914                 if (!rc) {
 915                         rc = cifs_init_request_bufs();
 916                         if (!rc) {
 917                                 rc = register_filesystem(&cifs_fs_type);
 918                                 if (!rc) {
 919                                         rc = (int)kernel_thread(cifs_oplock_thread, NULL,
 920                                                 CLONE_FS | CLONE_FILES | CLONE_VM);
 921                                         if(rc > 0) {
 922                                                 rc = (int)kernel_thread(cifs_dnotify_thread, NULL,
 923                                                         CLONE_FS | CLONE_FILES | CLONE_VM);
 924                                                 if(rc > 0)
 925                                                         return 0;
 926                                                 else
 927                                                         cERROR(1,("error %d create dnotify thread", rc));
 928                                         } else {
 929                                                 cERROR(1,("error %d create oplock thread",rc));
 930                                         }
 931                                 }
 932                                 cifs_destroy_request_bufs();
 933                         }
 934                         cifs_destroy_mids();
 935                 }
 936                 cifs_destroy_inodecache();
 937         }
 938 #ifdef CONFIG_PROC_FS
 939         cifs_proc_clean();
 940 #endif
 941         return rc;
 942 }
 943
 944 static void __exit
 945 exit_cifs(void)
 946 {
 947         cFYI(0, ("In unregister ie exit_cifs"));
 948 #ifdef CONFIG_PROC_FS
 949         cifs_proc_clean();
 950 #endif
 951         unregister_filesystem(&cifs_fs_type);
 952         cifs_destroy_inodecache();
 953         cifs_destroy_mids();
 954         cifs_destroy_request_bufs();
 955         if(oplockThread) {
 956                 send_sig(SIGTERM, oplockThread, 1);
 957                 wait_for_completion(&cifs_oplock_exited);
 958         }
 959         if(dnotifyThread) {
 960                 send_sig(SIGTERM, dnotifyThread, 1);
 961                 wait_for_completion(&cifs_dnotify_exited);
 962         }
 963 }
 964
 965 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
 966 MODULE_LICENSE("GPL");          /* combination of LGPL + GPL source behaves as GPL */
 967 MODULE_DESCRIPTION
 968     ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
 969 MODULE_VERSION(CIFS_VERSION);
 970 module_init(init_cifs)
 971 module_exit(exit_cifs)