fs/cifs/cifsfs.c

   1 /*
   2  *   fs/cifs/cifsfs.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2004
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   Common Internet FileSystem (CIFS) client
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 /* Note that BB means BUGBUG (ie something to fix eventually) */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/mount.h>
  29 #include <linux/slab.h>
  30 #include <linux/init.h>
  31 #include <linux/list.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/vfs.h>
  34 #include <linux/mempool.h>
  35 #include <linux/delay.h>
  36 #include <linux/kthread.h>
  37 #include "cifsfs.h"
  38 #include "cifspdu.h"
  39 #define DECLARE_GLOBALS_HERE
  40 #include "cifsglob.h"
  41 #include "cifsproto.h"
  42 #include "cifs_debug.h"
  43 #include "cifs_fs_sb.h"
  44 #include <linux/mm.h>
  45 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
  46
  47 #ifdef CONFIG_CIFS_QUOTA
  48 static struct quotactl_ops cifs_quotactl_ops;
  49 #endif
  50
  51 int cifsFYI = 0;
  52 int cifsERROR = 1;
  53 int traceSMB = 0;
  54 unsigned int oplockEnabled = 1;
  55 unsigned int experimEnabled = 0;
  56 unsigned int linuxExtEnabled = 1;
  57 unsigned int lookupCacheEnabled = 1;
  58 unsigned int multiuser_mount = 0;
  59 unsigned int extended_security = CIFSSEC_DEF;
  60 /* unsigned int ntlmv2_support = 0; */
  61 unsigned int sign_CIFS_PDUs = 1;
  62 extern struct task_struct * oplockThread; /* remove sparse warning */
  63 struct task_struct * oplockThread = NULL;
  64 extern struct task_struct * dnotifyThread; /* remove sparse warning */
  65 struct task_struct * dnotifyThread = NULL;
  66 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  67 module_param(CIFSMaxBufSize, int, 0);
  68 MODULE_PARM_DESC(CIFSMaxBufSize,"Network buffer size (not including header). Default: 16384 Range: 8192 to 130048");
  69 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  70 module_param(cifs_min_rcv, int, 0);
  71 MODULE_PARM_DESC(cifs_min_rcv,"Network buffers in pool. Default: 4 Range: 1 to 64");
  72 unsigned int cifs_min_small = 30;
  73 module_param(cifs_min_small, int, 0);
  74 MODULE_PARM_DESC(cifs_min_small,"Small network buffers in pool. Default: 30 Range: 2 to 256");
  75 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  76 module_param(cifs_max_pending, int, 0);
  77 MODULE_PARM_DESC(cifs_max_pending,"Simultaneous requests to server. Default: 50 Range: 2 to 256");
  78
  79 extern mempool_t *cifs_sm_req_poolp;
  80 extern mempool_t *cifs_req_poolp;
  81 extern mempool_t *cifs_mid_poolp;
  82
  83 extern kmem_cache_t *cifs_oplock_cachep;
  84
  85 static int
  86 cifs_read_super(struct super_block *sb, void *data,
  87                 const char *devname, int silent)
  88 {
  89         struct inode *inode;
  90         struct cifs_sb_info *cifs_sb;
  91         int rc = 0;
  92
  93         sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */
  94         sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
  95         cifs_sb = CIFS_SB(sb);
  96         if(cifs_sb == NULL)
  97                 return -ENOMEM;
  98
  99         rc = cifs_mount(sb, cifs_sb, data, devname);
 100
 101         if (rc) {
 102                 if (!silent)
 103                         cERROR(1,
 104                                ("cifs_mount failed w/return code = %d", rc));
 105                 goto out_mount_failed;
 106         }
 107
 108         sb->s_magic = CIFS_MAGIC_NUMBER;
 109         sb->s_op = &cifs_super_ops;
 110 /*      if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
 111             sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
 112 #ifdef CONFIG_CIFS_QUOTA
 113         sb->s_qcop = &cifs_quotactl_ops;
 114 #endif
 115         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 116         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 117         inode = iget(sb, ROOT_I);
 118
 119         if (!inode) {
 120                 rc = -ENOMEM;
 121                 goto out_no_root;
 122         }
 123
 124         sb->s_root = d_alloc_root(inode);
 125
 126         if (!sb->s_root) {
 127                 rc = -ENOMEM;
 128                 goto out_no_root;
 129         }
 130
 131         return 0;
 132
 133 out_no_root:
 134         cERROR(1, ("cifs_read_super: get root inode failed"));
 135         if (inode)
 136                 iput(inode);
 137
 138 out_mount_failed:
 139         if(cifs_sb) {
 140                 if(cifs_sb->local_nls)
 141                         unload_nls(cifs_sb->local_nls);
 142                 kfree(cifs_sb);
 143         }
 144         return rc;
 145 }
 146
 147 static void
 148 cifs_put_super(struct super_block *sb)
 149 {
 150         int rc = 0;
 151         struct cifs_sb_info *cifs_sb;
 152
 153         cFYI(1, ("In cifs_put_super"));
 154         cifs_sb = CIFS_SB(sb);
 155         if(cifs_sb == NULL) {
 156                 cFYI(1,("Empty cifs superblock info passed to unmount"));
 157                 return;
 158         }
 159         rc = cifs_umount(sb, cifs_sb);
 160         if (rc) {
 161                 cERROR(1, ("cifs_umount failed with return code %d", rc));
 162         }
 163         unload_nls(cifs_sb->local_nls);
 164         kfree(cifs_sb);
 165         return;
 166 }
 167
 168 static int
 169 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 170 {
 171         struct super_block *sb = dentry->d_sb;
 172         int xid;
 173         int rc = -EOPNOTSUPP;
 174         struct cifs_sb_info *cifs_sb;
 175         struct cifsTconInfo *pTcon;
 176
 177         xid = GetXid();
 178
 179         cifs_sb = CIFS_SB(sb);
 180         pTcon = cifs_sb->tcon;
 181
 182         buf->f_type = CIFS_MAGIC_NUMBER;
 183
 184         /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
 185         buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would
 186                                       presumably be total path, but note
 187                                       that some servers (includinng Samba 3)
 188                                       have a shorter maximum path */
 189         buf->f_files = 0;       /* undefined */
 190         buf->f_ffree = 0;       /* unlimited */
 191
 192 /* BB we could add a second check for a QFS Unix capability bit */
 193 /* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
 194     if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &
 195                         le64_to_cpu(pTcon->fsUnixInfo.Capability)))
 196             rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);
 197
 198     /* Only need to call the old QFSInfo if failed
 199     on newer one */
 200     if(rc)
 201         rc = CIFSSMBQFSInfo(xid, pTcon, buf);
 202
 203         /* Old Windows servers do not support level 103, retry with level
 204            one if old server failed the previous call */
 205         if(rc)
 206                 rc = SMBOldQFSInfo(xid, pTcon, buf);
 207         /*
 208            int f_type;
 209            __fsid_t f_fsid;
 210            int f_namelen;  */
 211         /* BB get from info in tcon struct at mount time call to QFSAttrInfo */
 212         FreeXid(xid);
 213         return 0;               /* always return success? what if volume is no
 214                                    longer available? */
 215 }
 216
 217 static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
 218 {
 219         struct cifs_sb_info *cifs_sb;
 220
 221         cifs_sb = CIFS_SB(inode->i_sb);
 222
 223         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 224                 return 0;
 225         } else /* file mode might have been restricted at mount time
 226                 on the client (above and beyond ACL on servers) for
 227                 servers which do not support setting and viewing mode bits,
 228                 so allowing client to check permissions is useful */
 229                 return generic_permission(inode, mask, NULL);
 230 }
 231
 232 static kmem_cache_t *cifs_inode_cachep;
 233 static kmem_cache_t *cifs_req_cachep;
 234 static kmem_cache_t *cifs_mid_cachep;
 235 kmem_cache_t *cifs_oplock_cachep;
 236 static kmem_cache_t *cifs_sm_req_cachep;
 237 mempool_t *cifs_sm_req_poolp;
 238 mempool_t *cifs_req_poolp;
 239 mempool_t *cifs_mid_poolp;
 240
 241 static struct inode *
 242 cifs_alloc_inode(struct super_block *sb)
 243 {
 244         struct cifsInodeInfo *cifs_inode;
 245         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, SLAB_KERNEL);
 246         if (!cifs_inode)
 247                 return NULL;
 248         cifs_inode->cifsAttrs = 0x20;   /* default */
 249         atomic_set(&cifs_inode->inUse, 0);
 250         cifs_inode->time = 0;
 251         /* Until the file is open and we have gotten oplock
 252         info back from the server, can not assume caching of
 253         file data or metadata */
 254         cifs_inode->clientCanCacheRead = FALSE;
 255         cifs_inode->clientCanCacheAll = FALSE;
 256         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 257         cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;
 258         INIT_LIST_HEAD(&cifs_inode->openFileList);
 259         return &cifs_inode->vfs_inode;
 260 }
 261
 262 static void
 263 cifs_destroy_inode(struct inode *inode)
 264 {
 265         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 266 }
 267
 268 /*
 269  * cifs_show_options() is for displaying mount options in /proc/mounts.
 270  * Not all settable options are displayed but most of the important
 271  * ones are.
 272  */
 273 static int
 274 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 275 {
 276         struct cifs_sb_info *cifs_sb;
 277
 278         cifs_sb = CIFS_SB(m->mnt_sb);
 279
 280         if (cifs_sb) {
 281                 if (cifs_sb->tcon) {
 282                         seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
 283                         if (cifs_sb->tcon->ses) {
 284                                 if (cifs_sb->tcon->ses->userName)
 285                                         seq_printf(s, ",username=%s",
 286                                            cifs_sb->tcon->ses->userName);
 287                                 if(cifs_sb->tcon->ses->domainName)
 288                                         seq_printf(s, ",domain=%s",
 289                                            cifs_sb->tcon->ses->domainName);
 290                         }
 291                 }
 292                 seq_printf(s, ",rsize=%d",cifs_sb->rsize);
 293                 seq_printf(s, ",wsize=%d",cifs_sb->wsize);
 294         }
 295         return 0;
 296 }
 297
 298 #ifdef CONFIG_CIFS_QUOTA
 299 int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
 300                 struct fs_disk_quota * pdquota)
 301 {
 302         int xid;
 303         int rc = 0;
 304         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 305         struct cifsTconInfo *pTcon;
 306
 307         if(cifs_sb)
 308                 pTcon = cifs_sb->tcon;
 309         else
 310                 return -EIO;
 311
 312
 313         xid = GetXid();
 314         if(pTcon) {
 315                 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
 316         } else {
 317                 return -EIO;
 318         }
 319
 320         FreeXid(xid);
 321         return rc;
 322 }
 323
 324 int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
 325                 struct fs_disk_quota * pdquota)
 326 {
 327         int xid;
 328         int rc = 0;
 329         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 330         struct cifsTconInfo *pTcon;
 331
 332         if(cifs_sb)
 333                 pTcon = cifs_sb->tcon;
 334         else
 335                 return -EIO;
 336
 337         xid = GetXid();
 338         if(pTcon) {
 339                 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
 340         } else {
 341                 rc = -EIO;
 342         }
 343
 344         FreeXid(xid);
 345         return rc;
 346 }
 347
 348 int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
 349 {
 350         int xid;
 351         int rc = 0;
 352         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 353         struct cifsTconInfo *pTcon;
 354
 355         if(cifs_sb)
 356                 pTcon = cifs_sb->tcon;
 357         else
 358                 return -EIO;
 359
 360         xid = GetXid();
 361         if(pTcon) {
 362                 cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
 363         } else {
 364                 rc = -EIO;
 365         }
 366
 367         FreeXid(xid);
 368         return rc;
 369 }
 370
 371 int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
 372 {
 373         int xid;
 374         int rc = 0;
 375         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 376         struct cifsTconInfo *pTcon;
 377
 378         if(cifs_sb) {
 379                 pTcon = cifs_sb->tcon;
 380         } else {
 381                 return -EIO;
 382         }
 383         xid = GetXid();
 384         if(pTcon) {
 385                 cFYI(1,("pqstats %p",qstats));
 386         } else {
 387                 rc = -EIO;
 388         }
 389
 390         FreeXid(xid);
 391         return rc;
 392 }
 393
 394 static struct quotactl_ops cifs_quotactl_ops = {
 395         .set_xquota     = cifs_xquota_set,
 396         .get_xquota     = cifs_xquota_set,
 397         .set_xstate     = cifs_xstate_set,
 398         .get_xstate     = cifs_xstate_get,
 399 };
 400 #endif
 401
 402 static void cifs_umount_begin(struct vfsmount * vfsmnt, int flags)
 403 {
 404         struct cifs_sb_info *cifs_sb;
 405         struct cifsTconInfo * tcon;
 406
 407         if (!(flags & MNT_FORCE))
 408                 return;
 409         cifs_sb = CIFS_SB(vfsmnt->mnt_sb);
 410         if(cifs_sb == NULL)
 411                 return;
 412
 413         tcon = cifs_sb->tcon;
 414         if(tcon == NULL)
 415                 return;
 416         down(&tcon->tconSem);
 417         if (atomic_read(&tcon->useCount) == 1)
 418                 tcon->tidStatus = CifsExiting;
 419         up(&tcon->tconSem);
 420
 421         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 422         /* cancel_notify_requests(tcon); */
 423         if(tcon->ses && tcon->ses->server)
 424         {
 425                 cFYI(1,("wake up tasks now - umount begin not complete"));
 426                 wake_up_all(&tcon->ses->server->request_q);
 427                 wake_up_all(&tcon->ses->server->response_q);
 428                 msleep(1); /* yield */
 429                 /* we have to kick the requests once more */
 430                 wake_up_all(&tcon->ses->server->response_q);
 431                 msleep(1);
 432         }
 433 /* BB FIXME - finish add checks for tidStatus BB */
 434
 435         return;
 436 }
 437
 438 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 439 {
 440         *flags |= MS_NODIRATIME;
 441         return 0;
 442 }
 443
 444 struct super_operations cifs_super_ops = {
 445         .read_inode = cifs_read_inode,
 446         .put_super = cifs_put_super,
 447         .statfs = cifs_statfs,
 448         .alloc_inode = cifs_alloc_inode,
 449         .destroy_inode = cifs_destroy_inode,
 450 /*      .drop_inode         = generic_delete_inode,
 451         .delete_inode   = cifs_delete_inode,  *//* Do not need the above two functions
 452    unless later we add lazy close of inodes or unless the kernel forgets to call
 453    us with the same number of releases (closes) as opens */
 454         .show_options = cifs_show_options,
 455         .umount_begin   = cifs_umount_begin,
 456         .remount_fs = cifs_remount,
 457 };
 458
 459 static int
 460 cifs_get_sb(struct file_system_type *fs_type,
 461             int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 462 {
 463         int rc;
 464         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 465
 466         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 467
 468         if (IS_ERR(sb))
 469                 return PTR_ERR(sb);
 470
 471         sb->s_flags = flags;
 472
 473         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 474         if (rc) {
 475                 up_write(&sb->s_umount);
 476                 deactivate_super(sb);
 477                 return rc;
 478         }
 479         sb->s_flags |= MS_ACTIVE;
 480         return simple_set_mnt(mnt, sb);
 481 }
 482
 483 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 484                                    unsigned long nr_segs, loff_t pos)
 485 {
 486         struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
 487         ssize_t written;
 488
 489         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 490         if (!CIFS_I(inode)->clientCanCacheAll)
 491                 filemap_fdatawrite(inode->i_mapping);
 492         return written;
 493 }
 494
 495 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 496 {
 497         /* origin == SEEK_END => we must revalidate the cached file length */
 498         if (origin == 2) {
 499                 int retval = cifs_revalidate(file->f_dentry);
 500                 if (retval < 0)
 501                         return (loff_t)retval;
 502         }
 503         return remote_llseek(file, offset, origin);
 504 }
 505
 506 static struct file_system_type cifs_fs_type = {
 507         .owner = THIS_MODULE,
 508         .name = "cifs",
 509         .get_sb = cifs_get_sb,
 510         .kill_sb = kill_anon_super,
 511         /*  .fs_flags */
 512 };
 513 struct inode_operations cifs_dir_inode_ops = {
 514         .create = cifs_create,
 515         .lookup = cifs_lookup,
 516         .getattr = cifs_getattr,
 517         .unlink = cifs_unlink,
 518         .link = cifs_hardlink,
 519         .mkdir = cifs_mkdir,
 520         .rmdir = cifs_rmdir,
 521         .rename = cifs_rename,
 522         .permission = cifs_permission,
 523 /*      revalidate:cifs_revalidate,   */
 524         .setattr = cifs_setattr,
 525         .symlink = cifs_symlink,
 526         .mknod   = cifs_mknod,
 527 #ifdef CONFIG_CIFS_XATTR
 528         .setxattr = cifs_setxattr,
 529         .getxattr = cifs_getxattr,
 530         .listxattr = cifs_listxattr,
 531         .removexattr = cifs_removexattr,
 532 #endif
 533 };
 534
 535 struct inode_operations cifs_file_inode_ops = {
 536 /*      revalidate:cifs_revalidate, */
 537         .setattr = cifs_setattr,
 538         .getattr = cifs_getattr, /* do we need this anymore? */
 539         .rename = cifs_rename,
 540         .permission = cifs_permission,
 541 #ifdef CONFIG_CIFS_XATTR
 542         .setxattr = cifs_setxattr,
 543         .getxattr = cifs_getxattr,
 544         .listxattr = cifs_listxattr,
 545         .removexattr = cifs_removexattr,
 546 #endif
 547 };
 548
 549 struct inode_operations cifs_symlink_inode_ops = {
 550         .readlink = generic_readlink,
 551         .follow_link = cifs_follow_link,
 552         .put_link = cifs_put_link,
 553         .permission = cifs_permission,
 554         /* BB add the following two eventually */
 555         /* revalidate: cifs_revalidate,
 556            setattr:    cifs_notify_change, *//* BB do we need notify change */
 557 #ifdef CONFIG_CIFS_XATTR
 558         .setxattr = cifs_setxattr,
 559         .getxattr = cifs_getxattr,
 560         .listxattr = cifs_listxattr,
 561         .removexattr = cifs_removexattr,
 562 #endif
 563 };
 564
 565 const struct file_operations cifs_file_ops = {
 566         .read = do_sync_read,
 567         .write = do_sync_write,
 568         .aio_read = generic_file_aio_read,
 569         .aio_write = cifs_file_aio_write,
 570         .open = cifs_open,
 571         .release = cifs_close,
 572         .lock = cifs_lock,
 573         .fsync = cifs_fsync,
 574         .flush = cifs_flush,
 575         .mmap  = cifs_file_mmap,
 576         .sendfile = generic_file_sendfile,
 577         .llseek = cifs_llseek,
 578 #ifdef CONFIG_CIFS_POSIX
 579         .ioctl  = cifs_ioctl,
 580 #endif /* CONFIG_CIFS_POSIX */
 581
 582 #ifdef CONFIG_CIFS_EXPERIMENTAL
 583         .dir_notify = cifs_dir_notify,
 584 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 585 };
 586
 587 const struct file_operations cifs_file_direct_ops = {
 588         /* no mmap, no aio, no readv -
 589            BB reevaluate whether they can be done with directio, no cache */
 590         .read = cifs_user_read,
 591         .write = cifs_user_write,
 592         .open = cifs_open,
 593         .release = cifs_close,
 594         .lock = cifs_lock,
 595         .fsync = cifs_fsync,
 596         .flush = cifs_flush,
 597         .sendfile = generic_file_sendfile, /* BB removeme BB */
 598 #ifdef CONFIG_CIFS_POSIX
 599         .ioctl  = cifs_ioctl,
 600 #endif /* CONFIG_CIFS_POSIX */
 601         .llseek = cifs_llseek,
 602 #ifdef CONFIG_CIFS_EXPERIMENTAL
 603         .dir_notify = cifs_dir_notify,
 604 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 605 };
 606 const struct file_operations cifs_file_nobrl_ops = {
 607         .read = do_sync_read,
 608         .write = do_sync_write,
 609         .aio_read = generic_file_aio_read,
 610         .aio_write = cifs_file_aio_write,
 611         .open = cifs_open,
 612         .release = cifs_close,
 613         .fsync = cifs_fsync,
 614         .flush = cifs_flush,
 615         .mmap  = cifs_file_mmap,
 616         .sendfile = generic_file_sendfile,
 617         .llseek = cifs_llseek,
 618 #ifdef CONFIG_CIFS_POSIX
 619         .ioctl  = cifs_ioctl,
 620 #endif /* CONFIG_CIFS_POSIX */
 621
 622 #ifdef CONFIG_CIFS_EXPERIMENTAL
 623         .dir_notify = cifs_dir_notify,
 624 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 625 };
 626
 627 const struct file_operations cifs_file_direct_nobrl_ops = {
 628         /* no mmap, no aio, no readv -
 629            BB reevaluate whether they can be done with directio, no cache */
 630         .read = cifs_user_read,
 631         .write = cifs_user_write,
 632         .open = cifs_open,
 633         .release = cifs_close,
 634         .fsync = cifs_fsync,
 635         .flush = cifs_flush,
 636         .sendfile = generic_file_sendfile, /* BB removeme BB */
 637 #ifdef CONFIG_CIFS_POSIX
 638         .ioctl  = cifs_ioctl,
 639 #endif /* CONFIG_CIFS_POSIX */
 640         .llseek = cifs_llseek,
 641 #ifdef CONFIG_CIFS_EXPERIMENTAL
 642         .dir_notify = cifs_dir_notify,
 643 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 644 };
 645
 646 const struct file_operations cifs_dir_ops = {
 647         .readdir = cifs_readdir,
 648         .release = cifs_closedir,
 649         .read    = generic_read_dir,
 650 #ifdef CONFIG_CIFS_EXPERIMENTAL
 651         .dir_notify = cifs_dir_notify,
 652 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 653         .ioctl  = cifs_ioctl,
 654 };
 655
 656 static void
 657 cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags)
 658 {
 659         struct cifsInodeInfo *cifsi = inode;
 660
 661         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 662             SLAB_CTOR_CONSTRUCTOR) {
 663                 inode_init_once(&cifsi->vfs_inode);
 664                 INIT_LIST_HEAD(&cifsi->lockList);
 665         }
 666 }
 667
 668 static int
 669 cifs_init_inodecache(void)
 670 {
 671         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 672                                               sizeof (struct cifsInodeInfo),
 673                                               0, (SLAB_RECLAIM_ACCOUNT|
 674                                                 SLAB_MEM_SPREAD),
 675                                               cifs_init_once, NULL);
 676         if (cifs_inode_cachep == NULL)
 677                 return -ENOMEM;
 678
 679         return 0;
 680 }
 681
 682 static void
 683 cifs_destroy_inodecache(void)
 684 {
 685         kmem_cache_destroy(cifs_inode_cachep);
 686 }
 687
 688 static int
 689 cifs_init_request_bufs(void)
 690 {
 691         if(CIFSMaxBufSize < 8192) {
 692         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 693         Unicode path name has to fit in any SMB/CIFS path based frames */
 694                 CIFSMaxBufSize = 8192;
 695         } else if (CIFSMaxBufSize > 1024*127) {
 696                 CIFSMaxBufSize = 1024 * 127;
 697         } else {
 698                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 699         }
 700 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 701         cifs_req_cachep = kmem_cache_create("cifs_request",
 702                                             CIFSMaxBufSize +
 703                                             MAX_CIFS_HDR_SIZE, 0,
 704                                             SLAB_HWCACHE_ALIGN, NULL, NULL);
 705         if (cifs_req_cachep == NULL)
 706                 return -ENOMEM;
 707
 708         if(cifs_min_rcv < 1)
 709                 cifs_min_rcv = 1;
 710         else if (cifs_min_rcv > 64) {
 711                 cifs_min_rcv = 64;
 712                 cERROR(1,("cifs_min_rcv set to maximum (64)"));
 713         }
 714
 715         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 716                                                   cifs_req_cachep);
 717
 718         if(cifs_req_poolp == NULL) {
 719                 kmem_cache_destroy(cifs_req_cachep);
 720                 return -ENOMEM;
 721         }
 722         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 723         almost all handle based requests (but not write response, nor is it
 724         sufficient for path based requests).  A smaller size would have
 725         been more efficient (compacting multiple slab items on one 4k page)
 726         for the case in which debug was on, but this larger size allows
 727         more SMBs to use small buffer alloc and is still much more
 728         efficient to alloc 1 per page off the slab compared to 17K (5page)
 729         alloc of large cifs buffers even when page debugging is on */
 730         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 731                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 732                         NULL, NULL);
 733         if (cifs_sm_req_cachep == NULL) {
 734                 mempool_destroy(cifs_req_poolp);
 735                 kmem_cache_destroy(cifs_req_cachep);
 736                 return -ENOMEM;
 737         }
 738
 739         if(cifs_min_small < 2)
 740                 cifs_min_small = 2;
 741         else if (cifs_min_small > 256) {
 742                 cifs_min_small = 256;
 743                 cFYI(1,("cifs_min_small set to maximum (256)"));
 744         }
 745
 746         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 747                                                      cifs_sm_req_cachep);
 748
 749         if(cifs_sm_req_poolp == NULL) {
 750                 mempool_destroy(cifs_req_poolp);
 751                 kmem_cache_destroy(cifs_req_cachep);
 752                 kmem_cache_destroy(cifs_sm_req_cachep);
 753                 return -ENOMEM;
 754         }
 755
 756         return 0;
 757 }
 758
 759 static void
 760 cifs_destroy_request_bufs(void)
 761 {
 762         mempool_destroy(cifs_req_poolp);
 763         kmem_cache_destroy(cifs_req_cachep);
 764         mempool_destroy(cifs_sm_req_poolp);
 765         kmem_cache_destroy(cifs_sm_req_cachep);
 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         /* 3 is a reasonable minimum number of simultaneous operations */
 778         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 779         if(cifs_mid_poolp == NULL) {
 780                 kmem_cache_destroy(cifs_mid_cachep);
 781                 return -ENOMEM;
 782         }
 783
 784         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 785                                 sizeof (struct oplock_q_entry), 0,
 786                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 787         if (cifs_oplock_cachep == NULL) {
 788                 kmem_cache_destroy(cifs_mid_cachep);
 789                 mempool_destroy(cifs_mid_poolp);
 790                 return -ENOMEM;
 791         }
 792
 793         return 0;
 794 }
 795
 796 static void
 797 cifs_destroy_mids(void)
 798 {
 799         mempool_destroy(cifs_mid_poolp);
 800         kmem_cache_destroy(cifs_mid_cachep);
 801         kmem_cache_destroy(cifs_oplock_cachep);
 802 }
 803
 804 static int cifs_oplock_thread(void * dummyarg)
 805 {
 806         struct oplock_q_entry * oplock_item;
 807         struct cifsTconInfo *pTcon;
 808         struct inode * inode;
 809         __u16  netfid;
 810         int rc;
 811
 812         do {
 813                 if (try_to_freeze())
 814                         continue;
 815
 816                 spin_lock(&GlobalMid_Lock);
 817                 if(list_empty(&GlobalOplock_Q)) {
 818                         spin_unlock(&GlobalMid_Lock);
 819                         set_current_state(TASK_INTERRUPTIBLE);
 820                         schedule_timeout(39*HZ);
 821                 } else {
 822                         oplock_item = list_entry(GlobalOplock_Q.next,
 823                                 struct oplock_q_entry, qhead);
 824                         if(oplock_item) {
 825                                 cFYI(1,("found oplock item to write out"));
 826                                 pTcon = oplock_item->tcon;
 827                                 inode = oplock_item->pinode;
 828                                 netfid = oplock_item->netfid;
 829                                 spin_unlock(&GlobalMid_Lock);
 830                                 DeleteOplockQEntry(oplock_item);
 831                                 /* can not grab inode sem here since it would
 832                                 deadlock when oplock received on delete
 833                                 since vfs_unlink holds the i_mutex across
 834                                 the call */
 835                                 /* mutex_lock(&inode->i_mutex);*/
 836                                 if (S_ISREG(inode->i_mode)) {
 837                                         rc = filemap_fdatawrite(inode->i_mapping);
 838                                         if(CIFS_I(inode)->clientCanCacheRead == 0) {
 839                                                 filemap_fdatawait(inode->i_mapping);
 840                                                 invalidate_remote_inode(inode);
 841                                         }
 842                                 } else
 843                                         rc = 0;
 844                                 /* mutex_unlock(&inode->i_mutex);*/
 845                                 if (rc)
 846                                         CIFS_I(inode)->write_behind_rc = rc;
 847                                 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
 848
 849                                 /* releasing a stale oplock after recent reconnection
 850                                 of smb session using a now incorrect file
 851                                 handle is not a data integrity issue but do
 852                                 not bother sending an oplock release if session
 853                                 to server still is disconnected since oplock
 854                                 already released by the server in that case */
 855                                 if(pTcon->tidStatus != CifsNeedReconnect) {
 856                                     rc = CIFSSMBLock(0, pTcon, netfid,
 857                                             0 /* len */ , 0 /* offset */, 0,
 858                                             0, LOCKING_ANDX_OPLOCK_RELEASE,
 859                                             0 /* wait flag */);
 860                                         cFYI(1,("Oplock release rc = %d ",rc));
 861                                 }
 862                         } else
 863                                 spin_unlock(&GlobalMid_Lock);
 864                         set_current_state(TASK_INTERRUPTIBLE);
 865                         schedule_timeout(1);  /* yield in case q were corrupt */
 866                 }
 867         } while (!kthread_should_stop());
 868
 869         return 0;
 870 }
 871
 872 static int cifs_dnotify_thread(void * dummyarg)
 873 {
 874         struct list_head *tmp;
 875         struct cifsSesInfo *ses;
 876
 877         do {
 878                 if (try_to_freeze())
 879                         continue;
 880                 set_current_state(TASK_INTERRUPTIBLE);
 881                 schedule_timeout(15*HZ);
 882                 read_lock(&GlobalSMBSeslock);
 883                 /* check if any stuck requests that need
 884                    to be woken up and wakeq so the
 885                    thread can wake up and error out */
 886                 list_for_each(tmp, &GlobalSMBSessionList) {
 887                         ses = list_entry(tmp, struct cifsSesInfo,
 888                                 cifsSessionList);
 889                         if(ses && ses->server &&
 890                              atomic_read(&ses->server->inFlight))
 891                                 wake_up_all(&ses->server->response_q);
 892                 }
 893                 read_unlock(&GlobalSMBSeslock);
 894         } while (!kthread_should_stop());
 895
 896         return 0;
 897 }
 898
 899 static int __init
 900 init_cifs(void)
 901 {
 902         int rc = 0;
 903 #ifdef CONFIG_PROC_FS
 904         cifs_proc_init();
 905 #endif
 906         INIT_LIST_HEAD(&GlobalServerList);      /* BB not implemented yet */
 907         INIT_LIST_HEAD(&GlobalSMBSessionList);
 908         INIT_LIST_HEAD(&GlobalTreeConnectionList);
 909         INIT_LIST_HEAD(&GlobalOplock_Q);
 910 #ifdef CONFIG_CIFS_EXPERIMENTAL
 911         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 912         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 913 #endif
 914 /*
 915  *  Initialize Global counters
 916  */
 917         atomic_set(&sesInfoAllocCount, 0);
 918         atomic_set(&tconInfoAllocCount, 0);
 919         atomic_set(&tcpSesAllocCount,0);
 920         atomic_set(&tcpSesReconnectCount, 0);
 921         atomic_set(&tconInfoReconnectCount, 0);
 922
 923         atomic_set(&bufAllocCount, 0);
 924         atomic_set(&smBufAllocCount, 0);
 925 #ifdef CONFIG_CIFS_STATS2
 926         atomic_set(&totBufAllocCount, 0);
 927         atomic_set(&totSmBufAllocCount, 0);
 928 #endif /* CONFIG_CIFS_STATS2 */
 929
 930         atomic_set(&midCount, 0);
 931         GlobalCurrentXid = 0;
 932         GlobalTotalActiveXid = 0;
 933         GlobalMaxActiveXid = 0;
 934         rwlock_init(&GlobalSMBSeslock);
 935         spin_lock_init(&GlobalMid_Lock);
 936
 937         if(cifs_max_pending < 2) {
 938                 cifs_max_pending = 2;
 939                 cFYI(1,("cifs_max_pending set to min of 2"));
 940         } else if(cifs_max_pending > 256) {
 941                 cifs_max_pending = 256;
 942                 cFYI(1,("cifs_max_pending set to max of 256"));
 943         }
 944
 945         rc = cifs_init_inodecache();
 946         if (rc)
 947                 goto out_clean_proc;
 948
 949         rc = cifs_init_mids();
 950         if (rc)
 951                 goto out_destroy_inodecache;
 952
 953         rc = cifs_init_request_bufs();
 954         if (rc)
 955                 goto out_destroy_mids;
 956
 957         rc = register_filesystem(&cifs_fs_type);
 958         if (rc)
 959                 goto out_destroy_request_bufs;
 960
 961         oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
 962         if (IS_ERR(oplockThread)) {
 963                 rc = PTR_ERR(oplockThread);
 964                 cERROR(1,("error %d create oplock thread", rc));
 965                 goto out_unregister_filesystem;
 966         }
 967
 968         dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
 969         if (IS_ERR(dnotifyThread)) {
 970                 rc = PTR_ERR(dnotifyThread);
 971                 cERROR(1,("error %d create dnotify thread", rc));
 972                 goto out_stop_oplock_thread;
 973         }
 974
 975         return 0;
 976
 977  out_stop_oplock_thread:
 978         kthread_stop(oplockThread);
 979  out_unregister_filesystem:
 980         unregister_filesystem(&cifs_fs_type);
 981  out_destroy_request_bufs:
 982         cifs_destroy_request_bufs();
 983  out_destroy_mids:
 984         cifs_destroy_mids();
 985  out_destroy_inodecache:
 986         cifs_destroy_inodecache();
 987  out_clean_proc:
 988 #ifdef CONFIG_PROC_FS
 989         cifs_proc_clean();
 990 #endif
 991         return rc;
 992 }
 993
 994 static void __exit
 995 exit_cifs(void)
 996 {
 997         cFYI(0, ("In unregister ie exit_cifs"));
 998 #ifdef CONFIG_PROC_FS
 999         cifs_proc_clean();
1000 #endif
1001         unregister_filesystem(&cifs_fs_type);
1002         cifs_destroy_inodecache();
1003         cifs_destroy_mids();
1004         cifs_destroy_request_bufs();
1005         kthread_stop(oplockThread);
1006         kthread_stop(dnotifyThread);
1007 }
1008
1009 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1010 MODULE_LICENSE("GPL");          /* combination of LGPL + GPL source behaves as GPL */
1011 MODULE_DESCRIPTION
1012     ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
1013 MODULE_VERSION(CIFS_VERSION);
1014 module_init(init_cifs)
1015 module_exit(exit_cifs)