fs/cifs/cifsfs.c

   1 /*
   2  *   fs/cifs/cifsfs.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2004
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   Common Internet FileSystem (CIFS) client
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 /* Note that BB means BUGBUG (ie something to fix eventually) */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/mount.h>
  29 #include <linux/slab.h>
  30 #include <linux/init.h>
  31 #include <linux/list.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/vfs.h>
  34 #include <linux/mempool.h>
  35 #include <linux/delay.h>
  36 #include "cifsfs.h"
  37 #include "cifspdu.h"
  38 #define DECLARE_GLOBALS_HERE
  39 #include "cifsglob.h"
  40 #include "cifsproto.h"
  41 #include "cifs_debug.h"
  42 #include "cifs_fs_sb.h"
  43 #include <linux/mm.h>
  44 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
  45
  46 #ifdef CONFIG_CIFS_QUOTA
  47 static struct quotactl_ops cifs_quotactl_ops;
  48 #endif
  49
  50 int cifsFYI = 0;
  51 int cifsERROR = 1;
  52 int traceSMB = 0;
  53 unsigned int oplockEnabled = 1;
  54 unsigned int experimEnabled = 0;
  55 unsigned int linuxExtEnabled = 1;
  56 unsigned int lookupCacheEnabled = 1;
  57 unsigned int multiuser_mount = 0;
  58 unsigned int extended_security = 0;
  59 unsigned int ntlmv2_support = 0;
  60 unsigned int sign_CIFS_PDUs = 1;
  61 extern struct task_struct * oplockThread; /* remove sparse warning */
  62 struct task_struct * oplockThread = NULL;
  63 extern struct task_struct * dnotifyThread; /* remove sparse warning */
  64 struct task_struct * dnotifyThread = NULL;
  65 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  66 module_param(CIFSMaxBufSize, int, 0);
  67 MODULE_PARM_DESC(CIFSMaxBufSize,"Network buffer size (not including header). Default: 16384 Range: 8192 to 130048");
  68 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  69 module_param(cifs_min_rcv, int, 0);
  70 MODULE_PARM_DESC(cifs_min_rcv,"Network buffers in pool. Default: 4 Range: 1 to 64");
  71 unsigned int cifs_min_small = 30;
  72 module_param(cifs_min_small, int, 0);
  73 MODULE_PARM_DESC(cifs_min_small,"Small network buffers in pool. Default: 30 Range: 2 to 256");
  74 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  75 module_param(cifs_max_pending, int, 0);
  76 MODULE_PARM_DESC(cifs_max_pending,"Simultaneous requests to server. Default: 50 Range: 2 to 256");
  77
  78 static DECLARE_COMPLETION(cifs_oplock_exited);
  79 static DECLARE_COMPLETION(cifs_dnotify_exited);
  80
  81 extern mempool_t *cifs_sm_req_poolp;
  82 extern mempool_t *cifs_req_poolp;
  83 extern mempool_t *cifs_mid_poolp;
  84
  85 extern kmem_cache_t *cifs_oplock_cachep;
  86
  87 static int
  88 cifs_read_super(struct super_block *sb, void *data,
  89                 const char *devname, int silent)
  90 {
  91         struct inode *inode;
  92         struct cifs_sb_info *cifs_sb;
  93         int rc = 0;
  94
  95         sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */
  96         sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
  97         cifs_sb = CIFS_SB(sb);
  98         if(cifs_sb == NULL)
  99                 return -ENOMEM;
 100
 101         rc = cifs_mount(sb, cifs_sb, data, devname);
 102
 103         if (rc) {
 104                 if (!silent)
 105                         cERROR(1,
 106                                ("cifs_mount failed w/return code = %d", rc));
 107                 goto out_mount_failed;
 108         }
 109
 110         sb->s_magic = CIFS_MAGIC_NUMBER;
 111         sb->s_op = &cifs_super_ops;
 112 /*      if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
 113             sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
 114 #ifdef CONFIG_CIFS_QUOTA
 115         sb->s_qcop = &cifs_quotactl_ops;
 116 #endif
 117         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 118         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 119         inode = iget(sb, ROOT_I);
 120
 121         if (!inode) {
 122                 rc = -ENOMEM;
 123                 goto out_no_root;
 124         }
 125
 126         sb->s_root = d_alloc_root(inode);
 127
 128         if (!sb->s_root) {
 129                 rc = -ENOMEM;
 130                 goto out_no_root;
 131         }
 132
 133         return 0;
 134
 135 out_no_root:
 136         cERROR(1, ("cifs_read_super: get root inode failed"));
 137         if (inode)
 138                 iput(inode);
 139
 140 out_mount_failed:
 141         if(cifs_sb) {
 142                 if(cifs_sb->local_nls)
 143                         unload_nls(cifs_sb->local_nls);
 144                 kfree(cifs_sb);
 145         }
 146         return rc;
 147 }
 148
 149 static void
 150 cifs_put_super(struct super_block *sb)
 151 {
 152         int rc = 0;
 153         struct cifs_sb_info *cifs_sb;
 154
 155         cFYI(1, ("In cifs_put_super"));
 156         cifs_sb = CIFS_SB(sb);
 157         if(cifs_sb == NULL) {
 158                 cFYI(1,("Empty cifs superblock info passed to unmount"));
 159                 return;
 160         }
 161         rc = cifs_umount(sb, cifs_sb);
 162         if (rc) {
 163                 cERROR(1, ("cifs_umount failed with return code %d", rc));
 164         }
 165         unload_nls(cifs_sb->local_nls);
 166         kfree(cifs_sb);
 167         return;
 168 }
 169
 170 static int
 171 cifs_statfs(struct super_block *sb, struct kstatfs *buf)
 172 {
 173         int xid;
 174         int rc = -EOPNOTSUPP;
 175         struct cifs_sb_info *cifs_sb;
 176         struct cifsTconInfo *pTcon;
 177
 178         xid = GetXid();
 179
 180         cifs_sb = CIFS_SB(sb);
 181         pTcon = cifs_sb->tcon;
 182
 183         buf->f_type = CIFS_MAGIC_NUMBER;
 184
 185         /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
 186         buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would
 187                                       presumably be total path, but note
 188                                       that some servers (includinng Samba 3)
 189                                       have a shorter maximum path */
 190         buf->f_files = 0;       /* undefined */
 191         buf->f_ffree = 0;       /* unlimited */
 192
 193 #ifdef CONFIG_CIFS_EXPERIMENTAL
 194 /* BB we could add a second check for a QFS Unix capability bit */
 195 /* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
 196     if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &
 197                         le64_to_cpu(pTcon->fsUnixInfo.Capability)))
 198             rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);
 199
 200     /* Only need to call the old QFSInfo if failed
 201     on newer one */
 202     if(rc)
 203 #endif /* CIFS_EXPERIMENTAL */
 204         rc = CIFSSMBQFSInfo(xid, pTcon, buf);
 205
 206         /* Old Windows servers do not support level 103, retry with level
 207            one if old server failed the previous call */
 208         if(rc)
 209                 rc = SMBOldQFSInfo(xid, pTcon, buf);
 210         /*
 211            int f_type;
 212            __fsid_t f_fsid;
 213            int f_namelen;  */
 214         /* BB get from info in tcon struct at mount time call to QFSAttrInfo */
 215         FreeXid(xid);
 216         return 0;               /* always return success? what if volume is no
 217                                    longer available? */
 218 }
 219
 220 static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
 221 {
 222         struct cifs_sb_info *cifs_sb;
 223
 224         cifs_sb = CIFS_SB(inode->i_sb);
 225
 226         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 227                 return 0;
 228         } else /* file mode might have been restricted at mount time
 229                 on the client (above and beyond ACL on servers) for
 230                 servers which do not support setting and viewing mode bits,
 231                 so allowing client to check permissions is useful */
 232                 return generic_permission(inode, mask, NULL);
 233 }
 234
 235 static kmem_cache_t *cifs_inode_cachep;
 236 static kmem_cache_t *cifs_req_cachep;
 237 static kmem_cache_t *cifs_mid_cachep;
 238 kmem_cache_t *cifs_oplock_cachep;
 239 static kmem_cache_t *cifs_sm_req_cachep;
 240 mempool_t *cifs_sm_req_poolp;
 241 mempool_t *cifs_req_poolp;
 242 mempool_t *cifs_mid_poolp;
 243
 244 static struct inode *
 245 cifs_alloc_inode(struct super_block *sb)
 246 {
 247         struct cifsInodeInfo *cifs_inode;
 248         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, SLAB_KERNEL);
 249         if (!cifs_inode)
 250                 return NULL;
 251         cifs_inode->cifsAttrs = 0x20;   /* default */
 252         atomic_set(&cifs_inode->inUse, 0);
 253         cifs_inode->time = 0;
 254         /* Until the file is open and we have gotten oplock
 255         info back from the server, can not assume caching of
 256         file data or metadata */
 257         cifs_inode->clientCanCacheRead = FALSE;
 258         cifs_inode->clientCanCacheAll = FALSE;
 259         cifs_inode->vfs_inode.i_blksize = CIFS_MAX_MSGSIZE;
 260         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 261         cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;
 262         INIT_LIST_HEAD(&cifs_inode->openFileList);
 263         return &cifs_inode->vfs_inode;
 264 }
 265
 266 static void
 267 cifs_destroy_inode(struct inode *inode)
 268 {
 269         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 270 }
 271
 272 /*
 273  * cifs_show_options() is for displaying mount options in /proc/mounts.
 274  * Not all settable options are displayed but most of the important
 275  * ones are.
 276  */
 277 static int
 278 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 279 {
 280         struct cifs_sb_info *cifs_sb;
 281
 282         cifs_sb = CIFS_SB(m->mnt_sb);
 283
 284         if (cifs_sb) {
 285                 if (cifs_sb->tcon) {
 286                         seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
 287                         if (cifs_sb->tcon->ses) {
 288                                 if (cifs_sb->tcon->ses->userName)
 289                                         seq_printf(s, ",username=%s",
 290                                            cifs_sb->tcon->ses->userName);
 291                                 if(cifs_sb->tcon->ses->domainName)
 292                                         seq_printf(s, ",domain=%s",
 293                                            cifs_sb->tcon->ses->domainName);
 294                         }
 295                 }
 296                 seq_printf(s, ",rsize=%d",cifs_sb->rsize);
 297                 seq_printf(s, ",wsize=%d",cifs_sb->wsize);
 298         }
 299         return 0;
 300 }
 301
 302 #ifdef CONFIG_CIFS_QUOTA
 303 int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
 304                 struct fs_disk_quota * pdquota)
 305 {
 306         int xid;
 307         int rc = 0;
 308         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 309         struct cifsTconInfo *pTcon;
 310
 311         if(cifs_sb)
 312                 pTcon = cifs_sb->tcon;
 313         else
 314                 return -EIO;
 315
 316
 317         xid = GetXid();
 318         if(pTcon) {
 319                 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
 320         } else {
 321                 return -EIO;
 322         }
 323
 324         FreeXid(xid);
 325         return rc;
 326 }
 327
 328 int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
 329                 struct fs_disk_quota * pdquota)
 330 {
 331         int xid;
 332         int rc = 0;
 333         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 334         struct cifsTconInfo *pTcon;
 335
 336         if(cifs_sb)
 337                 pTcon = cifs_sb->tcon;
 338         else
 339                 return -EIO;
 340
 341         xid = GetXid();
 342         if(pTcon) {
 343                 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
 344         } else {
 345                 rc = -EIO;
 346         }
 347
 348         FreeXid(xid);
 349         return rc;
 350 }
 351
 352 int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
 353 {
 354         int xid;
 355         int rc = 0;
 356         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 357         struct cifsTconInfo *pTcon;
 358
 359         if(cifs_sb)
 360                 pTcon = cifs_sb->tcon;
 361         else
 362                 return -EIO;
 363
 364         xid = GetXid();
 365         if(pTcon) {
 366                 cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
 367         } else {
 368                 rc = -EIO;
 369         }
 370
 371         FreeXid(xid);
 372         return rc;
 373 }
 374
 375 int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
 376 {
 377         int xid;
 378         int rc = 0;
 379         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 380         struct cifsTconInfo *pTcon;
 381
 382         if(cifs_sb) {
 383                 pTcon = cifs_sb->tcon;
 384         } else {
 385                 return -EIO;
 386         }
 387         xid = GetXid();
 388         if(pTcon) {
 389                 cFYI(1,("pqstats %p",qstats));
 390         } else {
 391                 rc = -EIO;
 392         }
 393
 394         FreeXid(xid);
 395         return rc;
 396 }
 397
 398 static struct quotactl_ops cifs_quotactl_ops = {
 399         .set_xquota     = cifs_xquota_set,
 400         .get_xquota     = cifs_xquota_set,
 401         .set_xstate     = cifs_xstate_set,
 402         .get_xstate     = cifs_xstate_get,
 403 };
 404 #endif
 405
 406 #ifdef CONFIG_CIFS_EXPERIMENTAL
 407 static void cifs_umount_begin(struct super_block * sblock)
 408 {
 409         struct cifs_sb_info *cifs_sb;
 410         struct cifsTconInfo * tcon;
 411
 412         cifs_sb = CIFS_SB(sblock);
 413         if(cifs_sb == NULL)
 414                 return;
 415
 416         tcon = cifs_sb->tcon;
 417         if(tcon == NULL)
 418                 return;
 419         down(&tcon->tconSem);
 420         if (atomic_read(&tcon->useCount) == 1)
 421                 tcon->tidStatus = CifsExiting;
 422         up(&tcon->tconSem);
 423
 424         /* cancel_brl_requests(tcon); */
 425         /* cancel_notify_requests(tcon); */
 426         if(tcon->ses && tcon->ses->server)
 427         {
 428                 cFYI(1,("wake up tasks now - umount begin not complete"));
 429                 wake_up_all(&tcon->ses->server->request_q);
 430                 wake_up_all(&tcon->ses->server->response_q);
 431                 msleep(1); /* yield */
 432                 /* we have to kick the requests once more */
 433                 wake_up_all(&tcon->ses->server->response_q);
 434                 msleep(1);
 435         }
 436 /* BB FIXME - finish add checks for tidStatus BB */
 437
 438         return;
 439 }
 440 #endif
 441
 442 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 443 {
 444         *flags |= MS_NODIRATIME;
 445         return 0;
 446 }
 447
 448 struct super_operations cifs_super_ops = {
 449         .read_inode = cifs_read_inode,
 450         .put_super = cifs_put_super,
 451         .statfs = cifs_statfs,
 452         .alloc_inode = cifs_alloc_inode,
 453         .destroy_inode = cifs_destroy_inode,
 454 /*      .drop_inode         = generic_delete_inode,
 455         .delete_inode   = cifs_delete_inode,  *//* Do not need the above two functions
 456    unless later we add lazy close of inodes or unless the kernel forgets to call
 457    us with the same number of releases (closes) as opens */
 458         .show_options = cifs_show_options,
 459 #ifdef CONFIG_CIFS_EXPERIMENTAL
 460         .umount_begin   = cifs_umount_begin,
 461 #endif
 462         .remount_fs = cifs_remount,
 463 };
 464
 465 static struct super_block *
 466 cifs_get_sb(struct file_system_type *fs_type,
 467             int flags, const char *dev_name, void *data)
 468 {
 469         int rc;
 470         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 471
 472         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 473
 474         if (IS_ERR(sb))
 475                 return sb;
 476
 477         sb->s_flags = flags;
 478
 479         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 480         if (rc) {
 481                 up_write(&sb->s_umount);
 482                 deactivate_super(sb);
 483                 return ERR_PTR(rc);
 484         }
 485         sb->s_flags |= MS_ACTIVE;
 486         return sb;
 487 }
 488
 489 static ssize_t cifs_file_writev(struct file *file, const struct iovec *iov,
 490                                 unsigned long nr_segs, loff_t *ppos)
 491 {
 492         struct inode *inode = file->f_dentry->d_inode;
 493         ssize_t written;
 494
 495         written = generic_file_writev(file, iov, nr_segs, ppos);
 496         if (!CIFS_I(inode)->clientCanCacheAll)
 497                 filemap_fdatawrite(inode->i_mapping);
 498         return written;
 499 }
 500
 501 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const char __user *buf,
 502                                    size_t count, loff_t pos)
 503 {
 504         struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
 505         ssize_t written;
 506
 507         written = generic_file_aio_write(iocb, buf, count, pos);
 508         if (!CIFS_I(inode)->clientCanCacheAll)
 509                 filemap_fdatawrite(inode->i_mapping);
 510         return written;
 511 }
 512
 513 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 514 {
 515         /* origin == SEEK_END => we must revalidate the cached file length */
 516         if (origin == 2) {
 517                 int retval = cifs_revalidate(file->f_dentry);
 518                 if (retval < 0)
 519                         return (loff_t)retval;
 520         }
 521         return remote_llseek(file, offset, origin);
 522 }
 523
 524 static struct file_system_type cifs_fs_type = {
 525         .owner = THIS_MODULE,
 526         .name = "cifs",
 527         .get_sb = cifs_get_sb,
 528         .kill_sb = kill_anon_super,
 529         /*  .fs_flags */
 530 };
 531 struct inode_operations cifs_dir_inode_ops = {
 532         .create = cifs_create,
 533         .lookup = cifs_lookup,
 534         .getattr = cifs_getattr,
 535         .unlink = cifs_unlink,
 536         .link = cifs_hardlink,
 537         .mkdir = cifs_mkdir,
 538         .rmdir = cifs_rmdir,
 539         .rename = cifs_rename,
 540         .permission = cifs_permission,
 541 /*      revalidate:cifs_revalidate,   */
 542         .setattr = cifs_setattr,
 543         .symlink = cifs_symlink,
 544         .mknod   = cifs_mknod,
 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_file_inode_ops = {
 554 /*      revalidate:cifs_revalidate, */
 555         .setattr = cifs_setattr,
 556         .getattr = cifs_getattr, /* do we need this anymore? */
 557         .rename = cifs_rename,
 558         .permission = cifs_permission,
 559 #ifdef CONFIG_CIFS_XATTR
 560         .setxattr = cifs_setxattr,
 561         .getxattr = cifs_getxattr,
 562         .listxattr = cifs_listxattr,
 563         .removexattr = cifs_removexattr,
 564 #endif
 565 };
 566
 567 struct inode_operations cifs_symlink_inode_ops = {
 568         .readlink = generic_readlink,
 569         .follow_link = cifs_follow_link,
 570         .put_link = cifs_put_link,
 571         .permission = cifs_permission,
 572         /* BB add the following two eventually */
 573         /* revalidate: cifs_revalidate,
 574            setattr:    cifs_notify_change, *//* BB do we need notify change */
 575 #ifdef CONFIG_CIFS_XATTR
 576         .setxattr = cifs_setxattr,
 577         .getxattr = cifs_getxattr,
 578         .listxattr = cifs_listxattr,
 579         .removexattr = cifs_removexattr,
 580 #endif
 581 };
 582
 583 const struct file_operations cifs_file_ops = {
 584         .read = do_sync_read,
 585         .write = do_sync_write,
 586         .readv = generic_file_readv,
 587         .writev = cifs_file_writev,
 588         .aio_read = generic_file_aio_read,
 589         .aio_write = cifs_file_aio_write,
 590         .open = cifs_open,
 591         .release = cifs_close,
 592         .lock = cifs_lock,
 593         .fsync = cifs_fsync,
 594         .flush = cifs_flush,
 595         .mmap  = cifs_file_mmap,
 596         .sendfile = generic_file_sendfile,
 597         .llseek = cifs_llseek,
 598 #ifdef CONFIG_CIFS_POSIX
 599         .ioctl  = cifs_ioctl,
 600 #endif /* CONFIG_CIFS_POSIX */
 601
 602 #ifdef CONFIG_CIFS_EXPERIMENTAL
 603         .dir_notify = cifs_dir_notify,
 604 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 605 };
 606
 607 const struct file_operations cifs_file_direct_ops = {
 608         /* no mmap, no aio, no readv -
 609            BB reevaluate whether they can be done with directio, no cache */
 610         .read = cifs_user_read,
 611         .write = cifs_user_write,
 612         .open = cifs_open,
 613         .release = cifs_close,
 614         .lock = cifs_lock,
 615         .fsync = cifs_fsync,
 616         .flush = cifs_flush,
 617         .sendfile = generic_file_sendfile, /* BB removeme BB */
 618 #ifdef CONFIG_CIFS_POSIX
 619         .ioctl  = cifs_ioctl,
 620 #endif /* CONFIG_CIFS_POSIX */
 621         .llseek = cifs_llseek,
 622 #ifdef CONFIG_CIFS_EXPERIMENTAL
 623         .dir_notify = cifs_dir_notify,
 624 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 625 };
 626 const struct file_operations cifs_file_nobrl_ops = {
 627         .read = do_sync_read,
 628         .write = do_sync_write,
 629         .readv = generic_file_readv,
 630         .writev = cifs_file_writev,
 631         .aio_read = generic_file_aio_read,
 632         .aio_write = cifs_file_aio_write,
 633         .open = cifs_open,
 634         .release = cifs_close,
 635         .fsync = cifs_fsync,
 636         .flush = cifs_flush,
 637         .mmap  = cifs_file_mmap,
 638         .sendfile = generic_file_sendfile,
 639         .llseek = cifs_llseek,
 640 #ifdef CONFIG_CIFS_POSIX
 641         .ioctl  = cifs_ioctl,
 642 #endif /* CONFIG_CIFS_POSIX */
 643
 644 #ifdef CONFIG_CIFS_EXPERIMENTAL
 645         .dir_notify = cifs_dir_notify,
 646 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 647 };
 648
 649 const struct file_operations cifs_file_direct_nobrl_ops = {
 650         /* no mmap, no aio, no readv -
 651            BB reevaluate whether they can be done with directio, no cache */
 652         .read = cifs_user_read,
 653         .write = cifs_user_write,
 654         .open = cifs_open,
 655         .release = cifs_close,
 656         .fsync = cifs_fsync,
 657         .flush = cifs_flush,
 658         .sendfile = generic_file_sendfile, /* BB removeme BB */
 659 #ifdef CONFIG_CIFS_POSIX
 660         .ioctl  = cifs_ioctl,
 661 #endif /* CONFIG_CIFS_POSIX */
 662         .llseek = cifs_llseek,
 663 #ifdef CONFIG_CIFS_EXPERIMENTAL
 664         .dir_notify = cifs_dir_notify,
 665 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 666 };
 667
 668 const struct file_operations cifs_dir_ops = {
 669         .readdir = cifs_readdir,
 670         .release = cifs_closedir,
 671         .read    = generic_read_dir,
 672 #ifdef CONFIG_CIFS_EXPERIMENTAL
 673         .dir_notify = cifs_dir_notify,
 674 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 675         .ioctl  = cifs_ioctl,
 676 };
 677
 678 static void
 679 cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags)
 680 {
 681         struct cifsInodeInfo *cifsi = inode;
 682
 683         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 684             SLAB_CTOR_CONSTRUCTOR) {
 685                 inode_init_once(&cifsi->vfs_inode);
 686                 INIT_LIST_HEAD(&cifsi->lockList);
 687         }
 688 }
 689
 690 static int
 691 cifs_init_inodecache(void)
 692 {
 693         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 694                                               sizeof (struct cifsInodeInfo),
 695                                               0, (SLAB_RECLAIM_ACCOUNT|
 696                                                 SLAB_MEM_SPREAD),
 697                                               cifs_init_once, NULL);
 698         if (cifs_inode_cachep == NULL)
 699                 return -ENOMEM;
 700
 701         return 0;
 702 }
 703
 704 static void
 705 cifs_destroy_inodecache(void)
 706 {
 707         if (kmem_cache_destroy(cifs_inode_cachep))
 708                 printk(KERN_WARNING "cifs_inode_cache: error freeing\n");
 709 }
 710
 711 static int
 712 cifs_init_request_bufs(void)
 713 {
 714         if(CIFSMaxBufSize < 8192) {
 715         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 716         Unicode path name has to fit in any SMB/CIFS path based frames */
 717                 CIFSMaxBufSize = 8192;
 718         } else if (CIFSMaxBufSize > 1024*127) {
 719                 CIFSMaxBufSize = 1024 * 127;
 720         } else {
 721                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 722         }
 723 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 724         cifs_req_cachep = kmem_cache_create("cifs_request",
 725                                             CIFSMaxBufSize +
 726                                             MAX_CIFS_HDR_SIZE, 0,
 727                                             SLAB_HWCACHE_ALIGN, NULL, NULL);
 728         if (cifs_req_cachep == NULL)
 729                 return -ENOMEM;
 730
 731         if(cifs_min_rcv < 1)
 732                 cifs_min_rcv = 1;
 733         else if (cifs_min_rcv > 64) {
 734                 cifs_min_rcv = 64;
 735                 cERROR(1,("cifs_min_rcv set to maximum (64)"));
 736         }
 737
 738         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 739                                                   cifs_req_cachep);
 740
 741         if(cifs_req_poolp == NULL) {
 742                 kmem_cache_destroy(cifs_req_cachep);
 743                 return -ENOMEM;
 744         }
 745         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 746         almost all handle based requests (but not write response, nor is it
 747         sufficient for path based requests).  A smaller size would have
 748         been more efficient (compacting multiple slab items on one 4k page)
 749         for the case in which debug was on, but this larger size allows
 750         more SMBs to use small buffer alloc and is still much more
 751         efficient to alloc 1 per page off the slab compared to 17K (5page)
 752         alloc of large cifs buffers even when page debugging is on */
 753         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 754                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 755                         NULL, NULL);
 756         if (cifs_sm_req_cachep == NULL) {
 757                 mempool_destroy(cifs_req_poolp);
 758                 kmem_cache_destroy(cifs_req_cachep);
 759                 return -ENOMEM;
 760         }
 761
 762         if(cifs_min_small < 2)
 763                 cifs_min_small = 2;
 764         else if (cifs_min_small > 256) {
 765                 cifs_min_small = 256;
 766                 cFYI(1,("cifs_min_small set to maximum (256)"));
 767         }
 768
 769         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 770                                                      cifs_sm_req_cachep);
 771
 772         if(cifs_sm_req_poolp == NULL) {
 773                 mempool_destroy(cifs_req_poolp);
 774                 kmem_cache_destroy(cifs_req_cachep);
 775                 kmem_cache_destroy(cifs_sm_req_cachep);
 776                 return -ENOMEM;
 777         }
 778
 779         return 0;
 780 }
 781
 782 static void
 783 cifs_destroy_request_bufs(void)
 784 {
 785         mempool_destroy(cifs_req_poolp);
 786         if (kmem_cache_destroy(cifs_req_cachep))
 787                 printk(KERN_WARNING
 788                        "cifs_destroy_request_cache: error not all structures were freed\n");
 789         mempool_destroy(cifs_sm_req_poolp);
 790         if (kmem_cache_destroy(cifs_sm_req_cachep))
 791                 printk(KERN_WARNING
 792                       "cifs_destroy_request_cache: cifs_small_rq free error\n");
 793 }
 794
 795 static int
 796 cifs_init_mids(void)
 797 {
 798         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 799                                 sizeof (struct mid_q_entry), 0,
 800                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 801         if (cifs_mid_cachep == NULL)
 802                 return -ENOMEM;
 803
 804         /* 3 is a reasonable minimum number of simultaneous operations */
 805         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 806         if(cifs_mid_poolp == NULL) {
 807                 kmem_cache_destroy(cifs_mid_cachep);
 808                 return -ENOMEM;
 809         }
 810
 811         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 812                                 sizeof (struct oplock_q_entry), 0,
 813                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 814         if (cifs_oplock_cachep == NULL) {
 815                 kmem_cache_destroy(cifs_mid_cachep);
 816                 mempool_destroy(cifs_mid_poolp);
 817                 return -ENOMEM;
 818         }
 819
 820         return 0;
 821 }
 822
 823 static void
 824 cifs_destroy_mids(void)
 825 {
 826         mempool_destroy(cifs_mid_poolp);
 827         if (kmem_cache_destroy(cifs_mid_cachep))
 828                 printk(KERN_WARNING
 829                        "cifs_destroy_mids: error not all structures were freed\n");
 830
 831         if (kmem_cache_destroy(cifs_oplock_cachep))
 832                 printk(KERN_WARNING
 833                        "error not all oplock structures were freed\n");
 834 }
 835
 836 static int cifs_oplock_thread(void * dummyarg)
 837 {
 838         struct oplock_q_entry * oplock_item;
 839         struct cifsTconInfo *pTcon;
 840         struct inode * inode;
 841         __u16  netfid;
 842         int rc;
 843
 844         daemonize("cifsoplockd");
 845         allow_signal(SIGTERM);
 846
 847         oplockThread = current;
 848         do {
 849                 if (try_to_freeze())
 850                         continue;
 851
 852                 spin_lock(&GlobalMid_Lock);
 853                 if(list_empty(&GlobalOplock_Q)) {
 854                         spin_unlock(&GlobalMid_Lock);
 855                         set_current_state(TASK_INTERRUPTIBLE);
 856                         schedule_timeout(39*HZ);
 857                 } else {
 858                         oplock_item = list_entry(GlobalOplock_Q.next,
 859                                 struct oplock_q_entry, qhead);
 860                         if(oplock_item) {
 861                                 cFYI(1,("found oplock item to write out"));
 862                                 pTcon = oplock_item->tcon;
 863                                 inode = oplock_item->pinode;
 864                                 netfid = oplock_item->netfid;
 865                                 spin_unlock(&GlobalMid_Lock);
 866                                 DeleteOplockQEntry(oplock_item);
 867                                 /* can not grab inode sem here since it would
 868                                 deadlock when oplock received on delete
 869                                 since vfs_unlink holds the i_mutex across
 870                                 the call */
 871                                 /* mutex_lock(&inode->i_mutex);*/
 872                                 if (S_ISREG(inode->i_mode)) {
 873                                         rc = filemap_fdatawrite(inode->i_mapping);
 874                                         if(CIFS_I(inode)->clientCanCacheRead == 0) {
 875                                                 filemap_fdatawait(inode->i_mapping);
 876                                                 invalidate_remote_inode(inode);
 877                                         }
 878                                 } else
 879                                         rc = 0;
 880                                 /* mutex_unlock(&inode->i_mutex);*/
 881                                 if (rc)
 882                                         CIFS_I(inode)->write_behind_rc = rc;
 883                                 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
 884
 885                                 /* releasing a stale oplock after recent reconnection
 886                                 of smb session using a now incorrect file
 887                                 handle is not a data integrity issue but do
 888                                 not bother sending an oplock release if session
 889                                 to server still is disconnected since oplock
 890                                 already released by the server in that case */
 891                                 if(pTcon->tidStatus != CifsNeedReconnect) {
 892                                     rc = CIFSSMBLock(0, pTcon, netfid,
 893                                             0 /* len */ , 0 /* offset */, 0,
 894                                             0, LOCKING_ANDX_OPLOCK_RELEASE,
 895                                             0 /* wait flag */);
 896                                         cFYI(1,("Oplock release rc = %d ",rc));
 897                                 }
 898                         } else
 899                                 spin_unlock(&GlobalMid_Lock);
 900                         set_current_state(TASK_INTERRUPTIBLE);
 901                         schedule_timeout(1);  /* yield in case q were corrupt */
 902                 }
 903         } while(!signal_pending(current));
 904         oplockThread = NULL;
 905         complete_and_exit (&cifs_oplock_exited, 0);
 906 }
 907
 908 static int cifs_dnotify_thread(void * dummyarg)
 909 {
 910         struct list_head *tmp;
 911         struct cifsSesInfo *ses;
 912
 913         daemonize("cifsdnotifyd");
 914         allow_signal(SIGTERM);
 915
 916         dnotifyThread = current;
 917         do {
 918                 if(try_to_freeze())
 919                         continue;
 920                 set_current_state(TASK_INTERRUPTIBLE);
 921                 schedule_timeout(15*HZ);
 922                 read_lock(&GlobalSMBSeslock);
 923                 /* check if any stuck requests that need
 924                    to be woken up and wakeq so the
 925                    thread can wake up and error out */
 926                 list_for_each(tmp, &GlobalSMBSessionList) {
 927                         ses = list_entry(tmp, struct cifsSesInfo,
 928                                 cifsSessionList);
 929                         if(ses && ses->server &&
 930                              atomic_read(&ses->server->inFlight))
 931                                 wake_up_all(&ses->server->response_q);
 932                 }
 933                 read_unlock(&GlobalSMBSeslock);
 934         } while(!signal_pending(current));
 935         complete_and_exit (&cifs_dnotify_exited, 0);
 936 }
 937
 938 static int __init
 939 init_cifs(void)
 940 {
 941         int rc = 0;
 942 #ifdef CONFIG_PROC_FS
 943         cifs_proc_init();
 944 #endif
 945         INIT_LIST_HEAD(&GlobalServerList);      /* BB not implemented yet */
 946         INIT_LIST_HEAD(&GlobalSMBSessionList);
 947         INIT_LIST_HEAD(&GlobalTreeConnectionList);
 948         INIT_LIST_HEAD(&GlobalOplock_Q);
 949 #ifdef CONFIG_CIFS_EXPERIMENTAL
 950         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 951         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 952 #endif
 953 /*
 954  *  Initialize Global counters
 955  */
 956         atomic_set(&sesInfoAllocCount, 0);
 957         atomic_set(&tconInfoAllocCount, 0);
 958         atomic_set(&tcpSesAllocCount,0);
 959         atomic_set(&tcpSesReconnectCount, 0);
 960         atomic_set(&tconInfoReconnectCount, 0);
 961
 962         atomic_set(&bufAllocCount, 0);
 963         atomic_set(&smBufAllocCount, 0);
 964 #ifdef CONFIG_CIFS_STATS2
 965         atomic_set(&totBufAllocCount, 0);
 966         atomic_set(&totSmBufAllocCount, 0);
 967 #endif /* CONFIG_CIFS_STATS2 */
 968
 969         atomic_set(&midCount, 0);
 970         GlobalCurrentXid = 0;
 971         GlobalTotalActiveXid = 0;
 972         GlobalMaxActiveXid = 0;
 973         rwlock_init(&GlobalSMBSeslock);
 974         spin_lock_init(&GlobalMid_Lock);
 975
 976         if(cifs_max_pending < 2) {
 977                 cifs_max_pending = 2;
 978                 cFYI(1,("cifs_max_pending set to min of 2"));
 979         } else if(cifs_max_pending > 256) {
 980                 cifs_max_pending = 256;
 981                 cFYI(1,("cifs_max_pending set to max of 256"));
 982         }
 983
 984         rc = cifs_init_inodecache();
 985         if (!rc) {
 986                 rc = cifs_init_mids();
 987                 if (!rc) {
 988                         rc = cifs_init_request_bufs();
 989                         if (!rc) {
 990                                 rc = register_filesystem(&cifs_fs_type);
 991                                 if (!rc) {
 992                                         rc = (int)kernel_thread(cifs_oplock_thread, NULL,
 993                                                 CLONE_FS | CLONE_FILES | CLONE_VM);
 994                                         if(rc > 0) {
 995                                                 rc = (int)kernel_thread(cifs_dnotify_thread, NULL,
 996                                                         CLONE_FS | CLONE_FILES | CLONE_VM);
 997                                                 if(rc > 0)
 998                                                         return 0;
 999                                                 else
1000                                                         cERROR(1,("error %d create dnotify thread", rc));
1001                                         } else {
1002                                                 cERROR(1,("error %d create oplock thread",rc));
1003                                         }
1004                                 }
1005                                 cifs_destroy_request_bufs();
1006                         }
1007                         cifs_destroy_mids();
1008                 }
1009                 cifs_destroy_inodecache();
1010         }
1011 #ifdef CONFIG_PROC_FS
1012         cifs_proc_clean();
1013 #endif
1014         return rc;
1015 }
1016
1017 static void __exit
1018 exit_cifs(void)
1019 {
1020         cFYI(0, ("In unregister ie exit_cifs"));
1021 #ifdef CONFIG_PROC_FS
1022         cifs_proc_clean();
1023 #endif
1024         unregister_filesystem(&cifs_fs_type);
1025         cifs_destroy_inodecache();
1026         cifs_destroy_mids();
1027         cifs_destroy_request_bufs();
1028         if(oplockThread) {
1029                 send_sig(SIGTERM, oplockThread, 1);
1030                 wait_for_completion(&cifs_oplock_exited);
1031         }
1032         if(dnotifyThread) {
1033                 send_sig(SIGTERM, dnotifyThread, 1);
1034                 wait_for_completion(&cifs_dnotify_exited);
1035         }
1036 }
1037
1038 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1039 MODULE_LICENSE("GPL");          /* combination of LGPL + GPL source behaves as GPL */
1040 MODULE_DESCRIPTION
1041     ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
1042 MODULE_VERSION(CIFS_VERSION);
1043 module_init(init_cifs)
1044 module_exit(exit_cifs)