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 cifs_file_writev(struct file *file, const struct iovec *iov,
 487                                 unsigned long nr_segs, loff_t *ppos)
 488 {
 489         struct inode *inode = file->f_dentry->d_inode;
 490         ssize_t written;
 491
 492         written = generic_file_writev(file, iov, nr_segs, ppos);
 493         if (!CIFS_I(inode)->clientCanCacheAll)
 494                 filemap_fdatawrite(inode->i_mapping);
 495         return written;
 496 }
 497
 498 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const char __user *buf,
 499                                    size_t count, loff_t pos)
 500 {
 501         struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
 502         ssize_t written;
 503
 504         written = generic_file_aio_write(iocb, buf, count, pos);
 505         if (!CIFS_I(inode)->clientCanCacheAll)
 506                 filemap_fdatawrite(inode->i_mapping);
 507         return written;
 508 }
 509
 510 static struct file_system_type cifs_fs_type = {
 511         .owner = THIS_MODULE,
 512         .name = "cifs",
 513         .get_sb = cifs_get_sb,
 514         .kill_sb = kill_anon_super,
 515         /*  .fs_flags */
 516 };
 517 struct inode_operations cifs_dir_inode_ops = {
 518         .create = cifs_create,
 519         .lookup = cifs_lookup,
 520         .getattr = cifs_getattr,
 521         .unlink = cifs_unlink,
 522         .link = cifs_hardlink,
 523         .mkdir = cifs_mkdir,
 524         .rmdir = cifs_rmdir,
 525         .rename = cifs_rename,
 526         .permission = cifs_permission,
 527 /*      revalidate:cifs_revalidate,   */
 528         .setattr = cifs_setattr,
 529         .symlink = cifs_symlink,
 530         .mknod   = cifs_mknod,
 531 #ifdef CONFIG_CIFS_XATTR
 532         .setxattr = cifs_setxattr,
 533         .getxattr = cifs_getxattr,
 534         .listxattr = cifs_listxattr,
 535         .removexattr = cifs_removexattr,
 536 #endif
 537 };
 538
 539 struct inode_operations cifs_file_inode_ops = {
 540 /*      revalidate:cifs_revalidate, */
 541         .setattr = cifs_setattr,
 542         .getattr = cifs_getattr, /* do we need this anymore? */
 543         .rename = cifs_rename,
 544         .permission = cifs_permission,
 545 #ifdef CONFIG_CIFS_XATTR
 546         .setxattr = cifs_setxattr,
 547         .getxattr = cifs_getxattr,
 548         .listxattr = cifs_listxattr,
 549         .removexattr = cifs_removexattr,
 550 #endif
 551 };
 552
 553 struct inode_operations cifs_symlink_inode_ops = {
 554         .readlink = generic_readlink,
 555         .follow_link = cifs_follow_link,
 556         .put_link = cifs_put_link,
 557         .permission = cifs_permission,
 558         /* BB add the following two eventually */
 559         /* revalidate: cifs_revalidate,
 560            setattr:    cifs_notify_change, *//* BB do we need notify change */
 561 #ifdef CONFIG_CIFS_XATTR
 562         .setxattr = cifs_setxattr,
 563         .getxattr = cifs_getxattr,
 564         .listxattr = cifs_listxattr,
 565         .removexattr = cifs_removexattr,
 566 #endif
 567 };
 568
 569 struct file_operations cifs_file_ops = {
 570         .read = do_sync_read,
 571         .write = do_sync_write,
 572         .readv = generic_file_readv,
 573         .writev = cifs_file_writev,
 574         .aio_read = generic_file_aio_read,
 575         .aio_write = cifs_file_aio_write,
 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         .dir_notify = cifs_dir_notify,
 589 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 590 };
 591
 592 struct file_operations cifs_file_direct_ops = {
 593         /* no mmap, no aio, no readv -
 594            BB reevaluate whether they can be done with directio, no cache */
 595         .read = cifs_user_read,
 596         .write = cifs_user_write,
 597         .open = cifs_open,
 598         .release = cifs_close,
 599         .lock = cifs_lock,
 600         .fsync = cifs_fsync,
 601         .flush = cifs_flush,
 602         .sendfile = generic_file_sendfile, /* BB removeme BB */
 603 #ifdef CONFIG_CIFS_POSIX
 604         .ioctl  = cifs_ioctl,
 605 #endif /* CONFIG_CIFS_POSIX */
 606
 607 #ifdef CONFIG_CIFS_EXPERIMENTAL
 608         .dir_notify = cifs_dir_notify,
 609 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 610 };
 611 struct file_operations cifs_file_nobrl_ops = {
 612         .read = do_sync_read,
 613         .write = do_sync_write,
 614         .readv = generic_file_readv,
 615         .writev = cifs_file_writev,
 616         .aio_read = generic_file_aio_read,
 617         .aio_write = cifs_file_aio_write,
 618         .open = cifs_open,
 619         .release = cifs_close,
 620         .fsync = cifs_fsync,
 621         .flush = cifs_flush,
 622         .mmap  = cifs_file_mmap,
 623         .sendfile = generic_file_sendfile,
 624 #ifdef CONFIG_CIFS_POSIX
 625         .ioctl  = cifs_ioctl,
 626 #endif /* CONFIG_CIFS_POSIX */
 627
 628 #ifdef CONFIG_CIFS_EXPERIMENTAL
 629         .dir_notify = cifs_dir_notify,
 630 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 631 };
 632
 633 struct file_operations cifs_file_direct_nobrl_ops = {
 634         /* no mmap, no aio, no readv -
 635            BB reevaluate whether they can be done with directio, no cache */
 636         .read = cifs_user_read,
 637         .write = cifs_user_write,
 638         .open = cifs_open,
 639         .release = cifs_close,
 640         .fsync = cifs_fsync,
 641         .flush = cifs_flush,
 642         .sendfile = generic_file_sendfile, /* BB removeme BB */
 643 #ifdef CONFIG_CIFS_POSIX
 644         .ioctl  = cifs_ioctl,
 645 #endif /* CONFIG_CIFS_POSIX */
 646
 647 #ifdef CONFIG_CIFS_EXPERIMENTAL
 648         .dir_notify = cifs_dir_notify,
 649 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 650 };
 651
 652 struct file_operations cifs_dir_ops = {
 653         .readdir = cifs_readdir,
 654         .release = cifs_closedir,
 655         .read    = generic_read_dir,
 656 #ifdef CONFIG_CIFS_EXPERIMENTAL
 657         .dir_notify = cifs_dir_notify,
 658 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 659         .ioctl  = cifs_ioctl,
 660 };
 661
 662 static void
 663 cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags)
 664 {
 665         struct cifsInodeInfo *cifsi = inode;
 666
 667         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 668             SLAB_CTOR_CONSTRUCTOR) {
 669                 inode_init_once(&cifsi->vfs_inode);
 670                 INIT_LIST_HEAD(&cifsi->lockList);
 671         }
 672 }
 673
 674 static int
 675 cifs_init_inodecache(void)
 676 {
 677         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 678                                               sizeof (struct cifsInodeInfo),
 679                                               0, SLAB_RECLAIM_ACCOUNT,
 680                                               cifs_init_once, NULL);
 681         if (cifs_inode_cachep == NULL)
 682                 return -ENOMEM;
 683
 684         return 0;
 685 }
 686
 687 static void
 688 cifs_destroy_inodecache(void)
 689 {
 690         if (kmem_cache_destroy(cifs_inode_cachep))
 691                 printk(KERN_WARNING "cifs_inode_cache: error freeing\n");
 692 }
 693
 694 static int
 695 cifs_init_request_bufs(void)
 696 {
 697         if(CIFSMaxBufSize < 8192) {
 698         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 699         Unicode path name has to fit in any SMB/CIFS path based frames */
 700                 CIFSMaxBufSize = 8192;
 701         } else if (CIFSMaxBufSize > 1024*127) {
 702                 CIFSMaxBufSize = 1024 * 127;
 703         } else {
 704                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 705         }
 706 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 707         cifs_req_cachep = kmem_cache_create("cifs_request",
 708                                             CIFSMaxBufSize +
 709                                             MAX_CIFS_HDR_SIZE, 0,
 710                                             SLAB_HWCACHE_ALIGN, NULL, NULL);
 711         if (cifs_req_cachep == NULL)
 712                 return -ENOMEM;
 713
 714         if(cifs_min_rcv < 1)
 715                 cifs_min_rcv = 1;
 716         else if (cifs_min_rcv > 64) {
 717                 cifs_min_rcv = 64;
 718                 cERROR(1,("cifs_min_rcv set to maximum (64)"));
 719         }
 720
 721         cifs_req_poolp = mempool_create(cifs_min_rcv,
 722                                         mempool_alloc_slab,
 723                                         mempool_free_slab,
 724                                         cifs_req_cachep);
 725
 726         if(cifs_req_poolp == NULL) {
 727                 kmem_cache_destroy(cifs_req_cachep);
 728                 return -ENOMEM;
 729         }
 730         /* 256 (MAX_CIFS_HDR_SIZE bytes is enough for most SMB responses and
 731         almost all handle based requests (but not write response, nor is it
 732         sufficient for path based requests).  A smaller size would have
 733         been more efficient (compacting multiple slab items on one 4k page)
 734         for the case in which debug was on, but this larger size allows
 735         more SMBs to use small buffer alloc and is still much more
 736         efficient to alloc 1 per page off the slab compared to 17K (5page)
 737         alloc of large cifs buffers even when page debugging is on */
 738         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 739                         MAX_CIFS_HDR_SIZE, 0, SLAB_HWCACHE_ALIGN, NULL, NULL);
 740         if (cifs_sm_req_cachep == NULL) {
 741                 mempool_destroy(cifs_req_poolp);
 742                 kmem_cache_destroy(cifs_req_cachep);
 743                 return -ENOMEM;
 744         }
 745
 746         if(cifs_min_small < 2)
 747                 cifs_min_small = 2;
 748         else if (cifs_min_small > 256) {
 749                 cifs_min_small = 256;
 750                 cFYI(1,("cifs_min_small set to maximum (256)"));
 751         }
 752
 753         cifs_sm_req_poolp = mempool_create(cifs_min_small,
 754                                 mempool_alloc_slab,
 755                                 mempool_free_slab,
 756                                 cifs_sm_req_cachep);
 757
 758         if(cifs_sm_req_poolp == NULL) {
 759                 mempool_destroy(cifs_req_poolp);
 760                 kmem_cache_destroy(cifs_req_cachep);
 761                 kmem_cache_destroy(cifs_sm_req_cachep);
 762                 return -ENOMEM;
 763         }
 764
 765         return 0;
 766 }
 767
 768 static void
 769 cifs_destroy_request_bufs(void)
 770 {
 771         mempool_destroy(cifs_req_poolp);
 772         if (kmem_cache_destroy(cifs_req_cachep))
 773                 printk(KERN_WARNING
 774                        "cifs_destroy_request_cache: error not all structures were freed\n");
 775         mempool_destroy(cifs_sm_req_poolp);
 776         if (kmem_cache_destroy(cifs_sm_req_cachep))
 777                 printk(KERN_WARNING
 778                       "cifs_destroy_request_cache: cifs_small_rq free error\n");
 779 }
 780
 781 static int
 782 cifs_init_mids(void)
 783 {
 784         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 785                                 sizeof (struct mid_q_entry), 0,
 786                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 787         if (cifs_mid_cachep == NULL)
 788                 return -ENOMEM;
 789
 790         cifs_mid_poolp = mempool_create(3 /* a reasonable min simultan opers */,
 791                                         mempool_alloc_slab,
 792                                         mempool_free_slab,
 793                                         cifs_mid_cachep);
 794         if(cifs_mid_poolp == NULL) {
 795                 kmem_cache_destroy(cifs_mid_cachep);
 796                 return -ENOMEM;
 797         }
 798
 799         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 800                                 sizeof (struct oplock_q_entry), 0,
 801                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 802         if (cifs_oplock_cachep == NULL) {
 803                 kmem_cache_destroy(cifs_mid_cachep);
 804                 mempool_destroy(cifs_mid_poolp);
 805                 return -ENOMEM;
 806         }
 807
 808         return 0;
 809 }
 810
 811 static void
 812 cifs_destroy_mids(void)
 813 {
 814         mempool_destroy(cifs_mid_poolp);
 815         if (kmem_cache_destroy(cifs_mid_cachep))
 816                 printk(KERN_WARNING
 817                        "cifs_destroy_mids: error not all structures were freed\n");
 818
 819         if (kmem_cache_destroy(cifs_oplock_cachep))
 820                 printk(KERN_WARNING
 821                        "error not all oplock structures were freed\n");
 822 }
 823
 824 static int cifs_oplock_thread(void * dummyarg)
 825 {
 826         struct oplock_q_entry * oplock_item;
 827         struct cifsTconInfo *pTcon;
 828         struct inode * inode;
 829         __u16  netfid;
 830         int rc;
 831
 832         daemonize("cifsoplockd");
 833         allow_signal(SIGTERM);
 834
 835         oplockThread = current;
 836         do {
 837                 if (try_to_freeze())
 838                         continue;
 839
 840                 spin_lock(&GlobalMid_Lock);
 841                 if(list_empty(&GlobalOplock_Q)) {
 842                         spin_unlock(&GlobalMid_Lock);
 843                         set_current_state(TASK_INTERRUPTIBLE);
 844                         schedule_timeout(39*HZ);
 845                 } else {
 846                         oplock_item = list_entry(GlobalOplock_Q.next,
 847                                 struct oplock_q_entry, qhead);
 848                         if(oplock_item) {
 849                                 cFYI(1,("found oplock item to write out"));
 850                                 pTcon = oplock_item->tcon;
 851                                 inode = oplock_item->pinode;
 852                                 netfid = oplock_item->netfid;
 853                                 spin_unlock(&GlobalMid_Lock);
 854                                 DeleteOplockQEntry(oplock_item);
 855                                 /* can not grab inode sem here since it would
 856                                 deadlock when oplock received on delete
 857                                 since vfs_unlink holds the i_sem across
 858                                 the call */
 859                                 /* down(&inode->i_sem);*/
 860                                 if (S_ISREG(inode->i_mode)) {
 861                                         rc = filemap_fdatawrite(inode->i_mapping);
 862                                         if(CIFS_I(inode)->clientCanCacheRead == 0) {
 863                                                 filemap_fdatawait(inode->i_mapping);
 864                                                 invalidate_remote_inode(inode);
 865                                         }
 866                                 } else
 867                                         rc = 0;
 868                                 /* up(&inode->i_sem);*/
 869                                 if (rc)
 870                                         CIFS_I(inode)->write_behind_rc = rc;
 871                                 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
 872
 873                                 /* releasing a stale oplock after recent reconnection
 874                                 of smb session using a now incorrect file
 875                                 handle is not a data integrity issue but do
 876                                 not bother sending an oplock release if session
 877                                 to server still is disconnected since oplock
 878                                 already released by the server in that case */
 879                                 if(pTcon->tidStatus != CifsNeedReconnect) {
 880                                     rc = CIFSSMBLock(0, pTcon, netfid,
 881                                             0 /* len */ , 0 /* offset */, 0,
 882                                             0, LOCKING_ANDX_OPLOCK_RELEASE,
 883                                             0 /* wait flag */);
 884                                         cFYI(1,("Oplock release rc = %d ",rc));
 885                                 }
 886                         } else
 887                                 spin_unlock(&GlobalMid_Lock);
 888                         set_current_state(TASK_INTERRUPTIBLE);
 889                         schedule_timeout(1);  /* yield in case q were corrupt */
 890                 }
 891         } while(!signal_pending(current));
 892         oplockThread = NULL;
 893         complete_and_exit (&cifs_oplock_exited, 0);
 894 }
 895
 896 static int cifs_dnotify_thread(void * dummyarg)
 897 {
 898         daemonize("cifsdnotifyd");
 899         allow_signal(SIGTERM);
 900
 901         dnotifyThread = current;
 902         do {
 903                 if(try_to_freeze())
 904                         continue;
 905                 set_current_state(TASK_INTERRUPTIBLE);
 906                 schedule_timeout(39*HZ);
 907         } while(!signal_pending(current));
 908         complete_and_exit (&cifs_dnotify_exited, 0);
 909 }
 910
 911 static int __init
 912 init_cifs(void)
 913 {
 914         int rc = 0;
 915 #ifdef CONFIG_PROC_FS
 916         cifs_proc_init();
 917 #endif
 918         INIT_LIST_HEAD(&GlobalServerList);      /* BB not implemented yet */
 919         INIT_LIST_HEAD(&GlobalSMBSessionList);
 920         INIT_LIST_HEAD(&GlobalTreeConnectionList);
 921         INIT_LIST_HEAD(&GlobalOplock_Q);
 922 #ifdef CONFIG_CIFS_EXPERIMENTAL
 923         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 924         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 925 #endif
 926 /*
 927  *  Initialize Global counters
 928  */
 929         atomic_set(&sesInfoAllocCount, 0);
 930         atomic_set(&tconInfoAllocCount, 0);
 931         atomic_set(&tcpSesAllocCount,0);
 932         atomic_set(&tcpSesReconnectCount, 0);
 933         atomic_set(&tconInfoReconnectCount, 0);
 934
 935         atomic_set(&bufAllocCount, 0);
 936         atomic_set(&midCount, 0);
 937         GlobalCurrentXid = 0;
 938         GlobalTotalActiveXid = 0;
 939         GlobalMaxActiveXid = 0;
 940         rwlock_init(&GlobalSMBSeslock);
 941         spin_lock_init(&GlobalMid_Lock);
 942
 943         if(cifs_max_pending < 2) {
 944                 cifs_max_pending = 2;
 945                 cFYI(1,("cifs_max_pending set to min of 2"));
 946         } else if(cifs_max_pending > 256) {
 947                 cifs_max_pending = 256;
 948                 cFYI(1,("cifs_max_pending set to max of 256"));
 949         }
 950
 951         rc = cifs_init_inodecache();
 952         if (!rc) {
 953                 rc = cifs_init_mids();
 954                 if (!rc) {
 955                         rc = cifs_init_request_bufs();
 956                         if (!rc) {
 957                                 rc = register_filesystem(&cifs_fs_type);
 958                                 if (!rc) {
 959                                         rc = (int)kernel_thread(cifs_oplock_thread, NULL,
 960                                                 CLONE_FS | CLONE_FILES | CLONE_VM);
 961                                         if(rc > 0) {
 962                                                 rc = (int)kernel_thread(cifs_dnotify_thread, NULL,
 963                                                         CLONE_FS | CLONE_FILES | CLONE_VM);
 964                                                 if(rc > 0)
 965                                                         return 0;
 966                                                 else
 967                                                         cERROR(1,("error %d create dnotify thread", rc));
 968                                         } else {
 969                                                 cERROR(1,("error %d create oplock thread",rc));
 970                                         }
 971                                 }
 972                                 cifs_destroy_request_bufs();
 973                         }
 974                         cifs_destroy_mids();
 975                 }
 976                 cifs_destroy_inodecache();
 977         }
 978 #ifdef CONFIG_PROC_FS
 979         cifs_proc_clean();
 980 #endif
 981         return rc;
 982 }
 983
 984 static void __exit
 985 exit_cifs(void)
 986 {
 987         cFYI(0, ("In unregister ie exit_cifs"));
 988 #ifdef CONFIG_PROC_FS
 989         cifs_proc_clean();
 990 #endif
 991         unregister_filesystem(&cifs_fs_type);
 992         cifs_destroy_inodecache();
 993         cifs_destroy_mids();
 994         cifs_destroy_request_bufs();
 995         if(oplockThread) {
 996                 send_sig(SIGTERM, oplockThread, 1);
 997                 wait_for_completion(&cifs_oplock_exited);
 998         }
 999         if(dnotifyThread) {
1000                 send_sig(SIGTERM, dnotifyThread, 1);
1001                 wait_for_completion(&cifs_dnotify_exited);
1002         }
1003 }
1004
1005 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1006 MODULE_LICENSE("GPL");          /* combination of LGPL + GPL source behaves as GPL */
1007 MODULE_DESCRIPTION
1008     ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
1009 MODULE_VERSION(CIFS_VERSION);
1010 module_init(init_cifs)
1011 module_exit(exit_cifs)