fs/cifs/cifsfs.c

   1 /*
   2  *   fs/cifs/cifsfs.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2007
   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 <linux/freezer.h>
  38 #include "cifsfs.h"
  39 #include "cifspdu.h"
  40 #define DECLARE_GLOBALS_HERE
  41 #include "cifsglob.h"
  42 #include "cifsproto.h"
  43 #include "cifs_debug.h"
  44 #include "cifs_fs_sb.h"
  45 #include <linux/mm.h>
  46 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
  47
  48 #ifdef CONFIG_CIFS_QUOTA
  49 static struct quotactl_ops cifs_quotactl_ops;
  50 #endif /* QUOTA */
  51
  52 #ifdef CONFIG_CIFS_EXPERIMENTAL
  53 extern struct export_operations cifs_export_ops;
  54 #endif /* EXPERIMENTAL */
  55
  56 int cifsFYI = 0;
  57 int cifsERROR = 1;
  58 int traceSMB = 0;
  59 unsigned int oplockEnabled = 1;
  60 unsigned int experimEnabled = 0;
  61 unsigned int linuxExtEnabled = 1;
  62 unsigned int lookupCacheEnabled = 1;
  63 unsigned int multiuser_mount = 0;
  64 unsigned int extended_security = CIFSSEC_DEF;
  65 /* unsigned int ntlmv2_support = 0; */
  66 unsigned int sign_CIFS_PDUs = 1;
  67 extern struct task_struct * oplockThread; /* remove sparse warning */
  68 struct task_struct * oplockThread = NULL;
  69 /* extern struct task_struct * dnotifyThread; remove sparse warning */
  70 static struct task_struct * dnotifyThread = NULL;
  71 static const struct super_operations cifs_super_ops;
  72 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  73 module_param(CIFSMaxBufSize, int, 0);
  74 MODULE_PARM_DESC(CIFSMaxBufSize,"Network buffer size (not including header). Default: 16384 Range: 8192 to 130048");
  75 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  76 module_param(cifs_min_rcv, int, 0);
  77 MODULE_PARM_DESC(cifs_min_rcv,"Network buffers in pool. Default: 4 Range: 1 to 64");
  78 unsigned int cifs_min_small = 30;
  79 module_param(cifs_min_small, int, 0);
  80 MODULE_PARM_DESC(cifs_min_small,"Small network buffers in pool. Default: 30 Range: 2 to 256");
  81 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  82 module_param(cifs_max_pending, int, 0);
  83 MODULE_PARM_DESC(cifs_max_pending,"Simultaneous requests to server. Default: 50 Range: 2 to 256");
  84
  85 extern mempool_t *cifs_sm_req_poolp;
  86 extern mempool_t *cifs_req_poolp;
  87 extern mempool_t *cifs_mid_poolp;
  88
  89 extern struct kmem_cache *cifs_oplock_cachep;
  90
  91 static int
  92 cifs_read_super(struct super_block *sb, void *data,
  93                 const char *devname, int silent)
  94 {
  95         struct inode *inode;
  96         struct cifs_sb_info *cifs_sb;
  97         int rc = 0;
  98
  99         /* BB should we make this contingent on mount parm? */
 100         sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
 101         sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
 102         cifs_sb = CIFS_SB(sb);
 103         if (cifs_sb == NULL)
 104                 return -ENOMEM;
 105
 106         rc = cifs_mount(sb, cifs_sb, data, devname);
 107
 108         if (rc) {
 109                 if (!silent)
 110                         cERROR(1,
 111                                ("cifs_mount failed w/return code = %d", rc));
 112                 goto out_mount_failed;
 113         }
 114
 115         sb->s_magic = CIFS_MAGIC_NUMBER;
 116         sb->s_op = &cifs_super_ops;
 117 #ifdef CONFIG_CIFS_EXPERIMENTAL
 118         if (experimEnabled != 0)
 119                 sb->s_export_op = &cifs_export_ops;
 120 #endif /* EXPERIMENTAL */
 121 /*      if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
 122             sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
 123 #ifdef CONFIG_CIFS_QUOTA
 124         sb->s_qcop = &cifs_quotactl_ops;
 125 #endif
 126         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 127         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 128         inode = iget(sb, ROOT_I);
 129
 130         if (!inode) {
 131                 rc = -ENOMEM;
 132                 goto out_no_root;
 133         }
 134
 135         sb->s_root = d_alloc_root(inode);
 136
 137         if (!sb->s_root) {
 138                 rc = -ENOMEM;
 139                 goto out_no_root;
 140         }
 141
 142         return 0;
 143
 144 out_no_root:
 145         cERROR(1, ("cifs_read_super: get root inode failed"));
 146         if (inode)
 147                 iput(inode);
 148
 149 out_mount_failed:
 150         if (cifs_sb) {
 151                 if (cifs_sb->local_nls)
 152                         unload_nls(cifs_sb->local_nls);
 153                 kfree(cifs_sb);
 154         }
 155         return rc;
 156 }
 157
 158 static void
 159 cifs_put_super(struct super_block *sb)
 160 {
 161         int rc = 0;
 162         struct cifs_sb_info *cifs_sb;
 163
 164         cFYI(1, ("In cifs_put_super"));
 165         cifs_sb = CIFS_SB(sb);
 166         if (cifs_sb == NULL) {
 167                 cFYI(1,("Empty cifs superblock info passed to unmount"));
 168                 return;
 169         }
 170         rc = cifs_umount(sb, cifs_sb);
 171         if (rc) {
 172                 cERROR(1, ("cifs_umount failed with return code %d", rc));
 173         }
 174         unload_nls(cifs_sb->local_nls);
 175         kfree(cifs_sb);
 176         return;
 177 }
 178
 179 static int
 180 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 181 {
 182         struct super_block *sb = dentry->d_sb;
 183         int xid;
 184         int rc = -EOPNOTSUPP;
 185         struct cifs_sb_info *cifs_sb;
 186         struct cifsTconInfo *pTcon;
 187
 188         xid = GetXid();
 189
 190         cifs_sb = CIFS_SB(sb);
 191         pTcon = cifs_sb->tcon;
 192
 193         buf->f_type = CIFS_MAGIC_NUMBER;
 194
 195         /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
 196         buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would
 197                                       presumably be total path, but note
 198                                       that some servers (includinng Samba 3)
 199                                       have a shorter maximum path */
 200         buf->f_files = 0;       /* undefined */
 201         buf->f_ffree = 0;       /* unlimited */
 202
 203 /* BB we could add a second check for a QFS Unix capability bit */
 204 /* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
 205     if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &
 206                         le64_to_cpu(pTcon->fsUnixInfo.Capability)))
 207             rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);
 208
 209     /* Only need to call the old QFSInfo if failed
 210     on newer one */
 211     if (rc)
 212         if (pTcon->ses->capabilities & CAP_NT_SMBS)
 213                 rc = CIFSSMBQFSInfo(xid, pTcon, buf); /* not supported by OS2 */
 214
 215         /* Some old Windows servers also do not support level 103, retry with
 216            older level one if old server failed the previous call or we
 217            bypassed it because we detected that this was an older LANMAN sess */
 218         if (rc)
 219                 rc = SMBOldQFSInfo(xid, pTcon, buf);
 220         /*
 221            int f_type;
 222            __fsid_t f_fsid;
 223            int f_namelen;  */
 224         /* BB get from info in tcon struct at mount time call to QFSAttrInfo */
 225         FreeXid(xid);
 226         return 0;               /* always return success? what if volume is no
 227                                    longer available? */
 228 }
 229
 230 static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
 231 {
 232         struct cifs_sb_info *cifs_sb;
 233
 234         cifs_sb = CIFS_SB(inode->i_sb);
 235
 236         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 237                 return 0;
 238         } else /* file mode might have been restricted at mount time
 239                 on the client (above and beyond ACL on servers) for
 240                 servers which do not support setting and viewing mode bits,
 241                 so allowing client to check permissions is useful */
 242                 return generic_permission(inode, mask, NULL);
 243 }
 244
 245 static struct kmem_cache *cifs_inode_cachep;
 246 static struct kmem_cache *cifs_req_cachep;
 247 static struct kmem_cache *cifs_mid_cachep;
 248 struct kmem_cache *cifs_oplock_cachep;
 249 static struct kmem_cache *cifs_sm_req_cachep;
 250 mempool_t *cifs_sm_req_poolp;
 251 mempool_t *cifs_req_poolp;
 252 mempool_t *cifs_mid_poolp;
 253
 254 static struct inode *
 255 cifs_alloc_inode(struct super_block *sb)
 256 {
 257         struct cifsInodeInfo *cifs_inode;
 258         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 259         if (!cifs_inode)
 260                 return NULL;
 261         cifs_inode->cifsAttrs = 0x20;   /* default */
 262         atomic_set(&cifs_inode->inUse, 0);
 263         cifs_inode->time = 0;
 264         /* Until the file is open and we have gotten oplock
 265         info back from the server, can not assume caching of
 266         file data or metadata */
 267         cifs_inode->clientCanCacheRead = FALSE;
 268         cifs_inode->clientCanCacheAll = FALSE;
 269         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 270
 271         /* Can not set i_flags here - they get immediately overwritten
 272            to zero by the VFS */
 273 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 274         INIT_LIST_HEAD(&cifs_inode->openFileList);
 275         return &cifs_inode->vfs_inode;
 276 }
 277
 278 static void
 279 cifs_destroy_inode(struct inode *inode)
 280 {
 281         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 282 }
 283
 284 /*
 285  * cifs_show_options() is for displaying mount options in /proc/mounts.
 286  * Not all settable options are displayed but most of the important
 287  * ones are.
 288  */
 289 static int
 290 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 291 {
 292         struct cifs_sb_info *cifs_sb;
 293
 294         cifs_sb = CIFS_SB(m->mnt_sb);
 295
 296         if (cifs_sb) {
 297                 if (cifs_sb->tcon) {
 298 /* BB add prepath to mount options displayed */
 299                         seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
 300                         if (cifs_sb->tcon->ses) {
 301                                 if (cifs_sb->tcon->ses->userName)
 302                                         seq_printf(s, ",username=%s",
 303                                            cifs_sb->tcon->ses->userName);
 304                                 if (cifs_sb->tcon->ses->domainName)
 305                                         seq_printf(s, ",domain=%s",
 306                                            cifs_sb->tcon->ses->domainName);
 307                         }
 308                 }
 309                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 310                         seq_printf(s, ",posixpaths");
 311                 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) ||
 312                    !(cifs_sb->tcon->ses->capabilities & CAP_UNIX))
 313                         seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 314                 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) ||
 315                    !(cifs_sb->tcon->ses->capabilities & CAP_UNIX))
 316                         seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 317                 seq_printf(s, ",rsize=%d",cifs_sb->rsize);
 318                 seq_printf(s, ",wsize=%d",cifs_sb->wsize);
 319         }
 320         return 0;
 321 }
 322
 323 #ifdef CONFIG_CIFS_QUOTA
 324 int cifs_xquota_set(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
 338         xid = GetXid();
 339         if (pTcon) {
 340                 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
 341         } else {
 342                 return -EIO;
 343         }
 344
 345         FreeXid(xid);
 346         return rc;
 347 }
 348
 349 int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
 350                 struct fs_disk_quota * pdquota)
 351 {
 352         int xid;
 353         int rc = 0;
 354         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 355         struct cifsTconInfo *pTcon;
 356
 357         if (cifs_sb)
 358                 pTcon = cifs_sb->tcon;
 359         else
 360                 return -EIO;
 361
 362         xid = GetXid();
 363         if (pTcon) {
 364                 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
 365         } else {
 366                 rc = -EIO;
 367         }
 368
 369         FreeXid(xid);
 370         return rc;
 371 }
 372
 373 int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
 374 {
 375         int xid;
 376         int rc = 0;
 377         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 378         struct cifsTconInfo *pTcon;
 379
 380         if (cifs_sb)
 381                 pTcon = cifs_sb->tcon;
 382         else
 383                 return -EIO;
 384
 385         xid = GetXid();
 386         if (pTcon) {
 387                 cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
 388         } else {
 389                 rc = -EIO;
 390         }
 391
 392         FreeXid(xid);
 393         return rc;
 394 }
 395
 396 int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
 397 {
 398         int xid;
 399         int rc = 0;
 400         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 401         struct cifsTconInfo *pTcon;
 402
 403         if (cifs_sb) {
 404                 pTcon = cifs_sb->tcon;
 405         } else {
 406                 return -EIO;
 407         }
 408         xid = GetXid();
 409         if (pTcon) {
 410                 cFYI(1,("pqstats %p",qstats));
 411         } else {
 412                 rc = -EIO;
 413         }
 414
 415         FreeXid(xid);
 416         return rc;
 417 }
 418
 419 static struct quotactl_ops cifs_quotactl_ops = {
 420         .set_xquota     = cifs_xquota_set,
 421         .get_xquota     = cifs_xquota_set,
 422         .set_xstate     = cifs_xstate_set,
 423         .get_xstate     = cifs_xstate_get,
 424 };
 425 #endif
 426
 427 static void cifs_umount_begin(struct vfsmount * vfsmnt, int flags)
 428 {
 429         struct cifs_sb_info *cifs_sb;
 430         struct cifsTconInfo * tcon;
 431
 432         if (!(flags & MNT_FORCE))
 433                 return;
 434         cifs_sb = CIFS_SB(vfsmnt->mnt_sb);
 435         if (cifs_sb == NULL)
 436                 return;
 437
 438         tcon = cifs_sb->tcon;
 439         if (tcon == NULL)
 440                 return;
 441         down(&tcon->tconSem);
 442         if (atomic_read(&tcon->useCount) == 1)
 443                 tcon->tidStatus = CifsExiting;
 444         up(&tcon->tconSem);
 445
 446         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 447         /* cancel_notify_requests(tcon); */
 448         if (tcon->ses && tcon->ses->server)
 449         {
 450                 cFYI(1,("wake up tasks now - umount begin not complete"));
 451                 wake_up_all(&tcon->ses->server->request_q);
 452                 wake_up_all(&tcon->ses->server->response_q);
 453                 msleep(1); /* yield */
 454                 /* we have to kick the requests once more */
 455                 wake_up_all(&tcon->ses->server->response_q);
 456                 msleep(1);
 457         }
 458 /* BB FIXME - finish add checks for tidStatus BB */
 459
 460         return;
 461 }
 462
 463 #ifdef CONFIG_CIFS_STATS2
 464 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 465 {
 466         /* BB FIXME */
 467         return 0;
 468 }
 469 #endif
 470
 471 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 472 {
 473         *flags |= MS_NODIRATIME;
 474         return 0;
 475 }
 476
 477 static const struct super_operations cifs_super_ops = {
 478         .read_inode = cifs_read_inode,
 479         .put_super = cifs_put_super,
 480         .statfs = cifs_statfs,
 481         .alloc_inode = cifs_alloc_inode,
 482         .destroy_inode = cifs_destroy_inode,
 483 /*      .drop_inode         = generic_delete_inode,
 484         .delete_inode   = cifs_delete_inode,  *//* Do not need the above two functions
 485    unless later we add lazy close of inodes or unless the kernel forgets to call
 486    us with the same number of releases (closes) as opens */
 487         .show_options = cifs_show_options,
 488         .umount_begin   = cifs_umount_begin,
 489         .remount_fs = cifs_remount,
 490 #ifdef CONFIG_CIFS_STATS2
 491         .show_stats = cifs_show_stats,
 492 #endif
 493 };
 494
 495 static int
 496 cifs_get_sb(struct file_system_type *fs_type,
 497             int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 498 {
 499         int rc;
 500         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 501
 502         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 503
 504         if (IS_ERR(sb))
 505                 return PTR_ERR(sb);
 506
 507         sb->s_flags = flags;
 508
 509         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 510         if (rc) {
 511                 up_write(&sb->s_umount);
 512                 deactivate_super(sb);
 513                 return rc;
 514         }
 515         sb->s_flags |= MS_ACTIVE;
 516         return simple_set_mnt(mnt, sb);
 517 }
 518
 519 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 520                                    unsigned long nr_segs, loff_t pos)
 521 {
 522         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 523         ssize_t written;
 524
 525         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 526         if (!CIFS_I(inode)->clientCanCacheAll)
 527                 filemap_fdatawrite(inode->i_mapping);
 528         return written;
 529 }
 530
 531 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 532 {
 533         /* origin == SEEK_END => we must revalidate the cached file length */
 534         if (origin == SEEK_END) {
 535                 int retval;
 536
 537                 /* some applications poll for the file length in this strange
 538                    way so we must seek to end on non-oplocked files by
 539                    setting the revalidate time to zero */
 540                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 541
 542                 retval = cifs_revalidate(file->f_path.dentry);
 543                 if (retval < 0)
 544                         return (loff_t)retval;
 545         }
 546         return remote_llseek(file, offset, origin);
 547 }
 548
 549 static struct file_system_type cifs_fs_type = {
 550         .owner = THIS_MODULE,
 551         .name = "cifs",
 552         .get_sb = cifs_get_sb,
 553         .kill_sb = kill_anon_super,
 554         /*  .fs_flags */
 555 };
 556 const struct inode_operations cifs_dir_inode_ops = {
 557         .create = cifs_create,
 558         .lookup = cifs_lookup,
 559         .getattr = cifs_getattr,
 560         .unlink = cifs_unlink,
 561         .link = cifs_hardlink,
 562         .mkdir = cifs_mkdir,
 563         .rmdir = cifs_rmdir,
 564         .rename = cifs_rename,
 565         .permission = cifs_permission,
 566 /*      revalidate:cifs_revalidate,   */
 567         .setattr = cifs_setattr,
 568         .symlink = cifs_symlink,
 569         .mknod   = cifs_mknod,
 570 #ifdef CONFIG_CIFS_XATTR
 571         .setxattr = cifs_setxattr,
 572         .getxattr = cifs_getxattr,
 573         .listxattr = cifs_listxattr,
 574         .removexattr = cifs_removexattr,
 575 #endif
 576 };
 577
 578 const struct inode_operations cifs_file_inode_ops = {
 579 /*      revalidate:cifs_revalidate, */
 580         .setattr = cifs_setattr,
 581         .getattr = cifs_getattr, /* do we need this anymore? */
 582         .rename = cifs_rename,
 583         .permission = cifs_permission,
 584 #ifdef CONFIG_CIFS_XATTR
 585         .setxattr = cifs_setxattr,
 586         .getxattr = cifs_getxattr,
 587         .listxattr = cifs_listxattr,
 588         .removexattr = cifs_removexattr,
 589 #endif
 590 };
 591
 592 const struct inode_operations cifs_symlink_inode_ops = {
 593         .readlink = generic_readlink,
 594         .follow_link = cifs_follow_link,
 595         .put_link = cifs_put_link,
 596         .permission = cifs_permission,
 597         /* BB add the following two eventually */
 598         /* revalidate: cifs_revalidate,
 599            setattr:    cifs_notify_change, *//* BB do we need notify change */
 600 #ifdef CONFIG_CIFS_XATTR
 601         .setxattr = cifs_setxattr,
 602         .getxattr = cifs_getxattr,
 603         .listxattr = cifs_listxattr,
 604         .removexattr = cifs_removexattr,
 605 #endif
 606 };
 607
 608 const struct file_operations cifs_file_ops = {
 609         .read = do_sync_read,
 610         .write = do_sync_write,
 611         .aio_read = generic_file_aio_read,
 612         .aio_write = cifs_file_aio_write,
 613         .open = cifs_open,
 614         .release = cifs_close,
 615         .lock = cifs_lock,
 616         .fsync = cifs_fsync,
 617         .flush = cifs_flush,
 618         .mmap  = cifs_file_mmap,
 619         .sendfile = generic_file_sendfile,
 620         .llseek = cifs_llseek,
 621 #ifdef CONFIG_CIFS_POSIX
 622         .ioctl  = cifs_ioctl,
 623 #endif /* CONFIG_CIFS_POSIX */
 624
 625 #ifdef CONFIG_CIFS_EXPERIMENTAL
 626         .dir_notify = cifs_dir_notify,
 627 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 628 };
 629
 630 const struct file_operations cifs_file_direct_ops = {
 631         /* no mmap, no aio, no readv -
 632            BB reevaluate whether they can be done with directio, no cache */
 633         .read = cifs_user_read,
 634         .write = cifs_user_write,
 635         .open = cifs_open,
 636         .release = cifs_close,
 637         .lock = cifs_lock,
 638         .fsync = cifs_fsync,
 639         .flush = cifs_flush,
 640         .sendfile = generic_file_sendfile, /* BB removeme BB */
 641 #ifdef CONFIG_CIFS_POSIX
 642         .ioctl  = cifs_ioctl,
 643 #endif /* CONFIG_CIFS_POSIX */
 644         .llseek = cifs_llseek,
 645 #ifdef CONFIG_CIFS_EXPERIMENTAL
 646         .dir_notify = cifs_dir_notify,
 647 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 648 };
 649 const struct file_operations cifs_file_nobrl_ops = {
 650         .read = do_sync_read,
 651         .write = do_sync_write,
 652         .aio_read = generic_file_aio_read,
 653         .aio_write = cifs_file_aio_write,
 654         .open = cifs_open,
 655         .release = cifs_close,
 656         .fsync = cifs_fsync,
 657         .flush = cifs_flush,
 658         .mmap  = cifs_file_mmap,
 659         .sendfile = generic_file_sendfile,
 660         .llseek = cifs_llseek,
 661 #ifdef CONFIG_CIFS_POSIX
 662         .ioctl  = cifs_ioctl,
 663 #endif /* CONFIG_CIFS_POSIX */
 664
 665 #ifdef CONFIG_CIFS_EXPERIMENTAL
 666         .dir_notify = cifs_dir_notify,
 667 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 668 };
 669
 670 const struct file_operations cifs_file_direct_nobrl_ops = {
 671         /* no mmap, no aio, no readv -
 672            BB reevaluate whether they can be done with directio, no cache */
 673         .read = cifs_user_read,
 674         .write = cifs_user_write,
 675         .open = cifs_open,
 676         .release = cifs_close,
 677         .fsync = cifs_fsync,
 678         .flush = cifs_flush,
 679         .sendfile = generic_file_sendfile, /* BB removeme BB */
 680 #ifdef CONFIG_CIFS_POSIX
 681         .ioctl  = cifs_ioctl,
 682 #endif /* CONFIG_CIFS_POSIX */
 683         .llseek = cifs_llseek,
 684 #ifdef CONFIG_CIFS_EXPERIMENTAL
 685         .dir_notify = cifs_dir_notify,
 686 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 687 };
 688
 689 const struct file_operations cifs_dir_ops = {
 690         .readdir = cifs_readdir,
 691         .release = cifs_closedir,
 692         .read    = generic_read_dir,
 693 #ifdef CONFIG_CIFS_EXPERIMENTAL
 694         .dir_notify = cifs_dir_notify,
 695 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 696         .ioctl  = cifs_ioctl,
 697 };
 698
 699 static void
 700 cifs_init_once(void *inode, struct kmem_cache * cachep, unsigned long flags)
 701 {
 702         struct cifsInodeInfo *cifsi = inode;
 703
 704         if (flags & SLAB_CTOR_CONSTRUCTOR) {
 705                 inode_init_once(&cifsi->vfs_inode);
 706                 INIT_LIST_HEAD(&cifsi->lockList);
 707         }
 708 }
 709
 710 static int
 711 cifs_init_inodecache(void)
 712 {
 713         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 714                                               sizeof (struct cifsInodeInfo),
 715                                               0, (SLAB_RECLAIM_ACCOUNT|
 716                                                 SLAB_MEM_SPREAD),
 717                                               cifs_init_once, NULL);
 718         if (cifs_inode_cachep == NULL)
 719                 return -ENOMEM;
 720
 721         return 0;
 722 }
 723
 724 static void
 725 cifs_destroy_inodecache(void)
 726 {
 727         kmem_cache_destroy(cifs_inode_cachep);
 728 }
 729
 730 static int
 731 cifs_init_request_bufs(void)
 732 {
 733         if (CIFSMaxBufSize < 8192) {
 734         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 735         Unicode path name has to fit in any SMB/CIFS path based frames */
 736                 CIFSMaxBufSize = 8192;
 737         } else if (CIFSMaxBufSize > 1024*127) {
 738                 CIFSMaxBufSize = 1024 * 127;
 739         } else {
 740                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 741         }
 742 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 743         cifs_req_cachep = kmem_cache_create("cifs_request",
 744                                             CIFSMaxBufSize +
 745                                             MAX_CIFS_HDR_SIZE, 0,
 746                                             SLAB_HWCACHE_ALIGN, NULL, NULL);
 747         if (cifs_req_cachep == NULL)
 748                 return -ENOMEM;
 749
 750         if (cifs_min_rcv < 1)
 751                 cifs_min_rcv = 1;
 752         else if (cifs_min_rcv > 64) {
 753                 cifs_min_rcv = 64;
 754                 cERROR(1,("cifs_min_rcv set to maximum (64)"));
 755         }
 756
 757         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 758                                                   cifs_req_cachep);
 759
 760         if (cifs_req_poolp == NULL) {
 761                 kmem_cache_destroy(cifs_req_cachep);
 762                 return -ENOMEM;
 763         }
 764         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 765         almost all handle based requests (but not write response, nor is it
 766         sufficient for path based requests).  A smaller size would have
 767         been more efficient (compacting multiple slab items on one 4k page)
 768         for the case in which debug was on, but this larger size allows
 769         more SMBs to use small buffer alloc and is still much more
 770         efficient to alloc 1 per page off the slab compared to 17K (5page)
 771         alloc of large cifs buffers even when page debugging is on */
 772         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 773                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 774                         NULL, NULL);
 775         if (cifs_sm_req_cachep == NULL) {
 776                 mempool_destroy(cifs_req_poolp);
 777                 kmem_cache_destroy(cifs_req_cachep);
 778                 return -ENOMEM;
 779         }
 780
 781         if (cifs_min_small < 2)
 782                 cifs_min_small = 2;
 783         else if (cifs_min_small > 256) {
 784                 cifs_min_small = 256;
 785                 cFYI(1,("cifs_min_small set to maximum (256)"));
 786         }
 787
 788         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 789                                                      cifs_sm_req_cachep);
 790
 791         if (cifs_sm_req_poolp == NULL) {
 792                 mempool_destroy(cifs_req_poolp);
 793                 kmem_cache_destroy(cifs_req_cachep);
 794                 kmem_cache_destroy(cifs_sm_req_cachep);
 795                 return -ENOMEM;
 796         }
 797
 798         return 0;
 799 }
 800
 801 static void
 802 cifs_destroy_request_bufs(void)
 803 {
 804         mempool_destroy(cifs_req_poolp);
 805         kmem_cache_destroy(cifs_req_cachep);
 806         mempool_destroy(cifs_sm_req_poolp);
 807         kmem_cache_destroy(cifs_sm_req_cachep);
 808 }
 809
 810 static int
 811 cifs_init_mids(void)
 812 {
 813         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 814                                 sizeof (struct mid_q_entry), 0,
 815                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 816         if (cifs_mid_cachep == NULL)
 817                 return -ENOMEM;
 818
 819         /* 3 is a reasonable minimum number of simultaneous operations */
 820         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 821         if (cifs_mid_poolp == NULL) {
 822                 kmem_cache_destroy(cifs_mid_cachep);
 823                 return -ENOMEM;
 824         }
 825
 826         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 827                                 sizeof (struct oplock_q_entry), 0,
 828                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 829         if (cifs_oplock_cachep == NULL) {
 830                 kmem_cache_destroy(cifs_mid_cachep);
 831                 mempool_destroy(cifs_mid_poolp);
 832                 return -ENOMEM;
 833         }
 834
 835         return 0;
 836 }
 837
 838 static void
 839 cifs_destroy_mids(void)
 840 {
 841         mempool_destroy(cifs_mid_poolp);
 842         kmem_cache_destroy(cifs_mid_cachep);
 843         kmem_cache_destroy(cifs_oplock_cachep);
 844 }
 845
 846 static int cifs_oplock_thread(void * dummyarg)
 847 {
 848         struct oplock_q_entry * oplock_item;
 849         struct cifsTconInfo *pTcon;
 850         struct inode * inode;
 851         __u16  netfid;
 852         int rc;
 853
 854         do {
 855                 if (try_to_freeze())
 856                         continue;
 857
 858                 spin_lock(&GlobalMid_Lock);
 859                 if (list_empty(&GlobalOplock_Q)) {
 860                         spin_unlock(&GlobalMid_Lock);
 861                         set_current_state(TASK_INTERRUPTIBLE);
 862                         schedule_timeout(39*HZ);
 863                 } else {
 864                         oplock_item = list_entry(GlobalOplock_Q.next,
 865                                 struct oplock_q_entry, qhead);
 866                         if (oplock_item) {
 867                                 cFYI(1,("found oplock item to write out"));
 868                                 pTcon = oplock_item->tcon;
 869                                 inode = oplock_item->pinode;
 870                                 netfid = oplock_item->netfid;
 871                                 spin_unlock(&GlobalMid_Lock);
 872                                 DeleteOplockQEntry(oplock_item);
 873                                 /* can not grab inode sem here since it would
 874                                 deadlock when oplock received on delete
 875                                 since vfs_unlink holds the i_mutex across
 876                                 the call */
 877                                 /* mutex_lock(&inode->i_mutex);*/
 878                                 if (S_ISREG(inode->i_mode)) {
 879                                         rc = filemap_fdatawrite(inode->i_mapping);
 880                                         if (CIFS_I(inode)->clientCanCacheRead == 0) {
 881                                                 filemap_fdatawait(inode->i_mapping);
 882                                                 invalidate_remote_inode(inode);
 883                                         }
 884                                 } else
 885                                         rc = 0;
 886                                 /* mutex_unlock(&inode->i_mutex);*/
 887                                 if (rc)
 888                                         CIFS_I(inode)->write_behind_rc = rc;
 889                                 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
 890
 891                                 /* releasing a stale oplock after recent reconnection
 892                                 of smb session using a now incorrect file
 893                                 handle is not a data integrity issue but do
 894                                 not bother sending an oplock release if session
 895                                 to server still is disconnected since oplock
 896                                 already released by the server in that case */
 897                                 if (pTcon->tidStatus != CifsNeedReconnect) {
 898                                     rc = CIFSSMBLock(0, pTcon, netfid,
 899                                             0 /* len */ , 0 /* offset */, 0,
 900                                             0, LOCKING_ANDX_OPLOCK_RELEASE,
 901                                             0 /* wait flag */);
 902                                         cFYI(1,("Oplock release rc = %d ",rc));
 903                                 }
 904                         } else
 905                                 spin_unlock(&GlobalMid_Lock);
 906                         set_current_state(TASK_INTERRUPTIBLE);
 907                         schedule_timeout(1);  /* yield in case q were corrupt */
 908                 }
 909         } while (!kthread_should_stop());
 910
 911         return 0;
 912 }
 913
 914 static int cifs_dnotify_thread(void * dummyarg)
 915 {
 916         struct list_head *tmp;
 917         struct cifsSesInfo *ses;
 918
 919         do {
 920                 if (try_to_freeze())
 921                         continue;
 922                 set_current_state(TASK_INTERRUPTIBLE);
 923                 schedule_timeout(15*HZ);
 924                 read_lock(&GlobalSMBSeslock);
 925                 /* check if any stuck requests that need
 926                    to be woken up and wakeq so the
 927                    thread can wake up and error out */
 928                 list_for_each(tmp, &GlobalSMBSessionList) {
 929                         ses = list_entry(tmp, struct cifsSesInfo,
 930                                 cifsSessionList);
 931                         if (ses && ses->server &&
 932                              atomic_read(&ses->server->inFlight))
 933                                 wake_up_all(&ses->server->response_q);
 934                 }
 935                 read_unlock(&GlobalSMBSeslock);
 936         } while (!kthread_should_stop());
 937
 938         return 0;
 939 }
 940
 941 static int __init
 942 init_cifs(void)
 943 {
 944         int rc = 0;
 945 #ifdef CONFIG_PROC_FS
 946         cifs_proc_init();
 947 #endif
 948 /*      INIT_LIST_HEAD(&GlobalServerList);*/    /* BB not implemented yet */
 949         INIT_LIST_HEAD(&GlobalSMBSessionList);
 950         INIT_LIST_HEAD(&GlobalTreeConnectionList);
 951         INIT_LIST_HEAD(&GlobalOplock_Q);
 952 #ifdef CONFIG_CIFS_EXPERIMENTAL
 953         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 954         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 955 #endif
 956 /*
 957  *  Initialize Global counters
 958  */
 959         atomic_set(&sesInfoAllocCount, 0);
 960         atomic_set(&tconInfoAllocCount, 0);
 961         atomic_set(&tcpSesAllocCount,0);
 962         atomic_set(&tcpSesReconnectCount, 0);
 963         atomic_set(&tconInfoReconnectCount, 0);
 964
 965         atomic_set(&bufAllocCount, 0);
 966         atomic_set(&smBufAllocCount, 0);
 967 #ifdef CONFIG_CIFS_STATS2
 968         atomic_set(&totBufAllocCount, 0);
 969         atomic_set(&totSmBufAllocCount, 0);
 970 #endif /* CONFIG_CIFS_STATS2 */
 971
 972         atomic_set(&midCount, 0);
 973         GlobalCurrentXid = 0;
 974         GlobalTotalActiveXid = 0;
 975         GlobalMaxActiveXid = 0;
 976         memset(Local_System_Name, 0, 15);
 977         rwlock_init(&GlobalSMBSeslock);
 978         spin_lock_init(&GlobalMid_Lock);
 979
 980         if (cifs_max_pending < 2) {
 981                 cifs_max_pending = 2;
 982                 cFYI(1,("cifs_max_pending set to min of 2"));
 983         } else if (cifs_max_pending > 256) {
 984                 cifs_max_pending = 256;
 985                 cFYI(1,("cifs_max_pending set to max of 256"));
 986         }
 987
 988         rc = cifs_init_inodecache();
 989         if (rc)
 990                 goto out_clean_proc;
 991
 992         rc = cifs_init_mids();
 993         if (rc)
 994                 goto out_destroy_inodecache;
 995
 996         rc = cifs_init_request_bufs();
 997         if (rc)
 998                 goto out_destroy_mids;
 999
1000         rc = register_filesystem(&cifs_fs_type);
1001         if (rc)
1002                 goto out_destroy_request_bufs;
1003
1004         oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1005         if (IS_ERR(oplockThread)) {
1006                 rc = PTR_ERR(oplockThread);
1007                 cERROR(1,("error %d create oplock thread", rc));
1008                 goto out_unregister_filesystem;
1009         }
1010
1011         dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
1012         if (IS_ERR(dnotifyThread)) {
1013                 rc = PTR_ERR(dnotifyThread);
1014                 cERROR(1,("error %d create dnotify thread", rc));
1015                 goto out_stop_oplock_thread;
1016         }
1017
1018         return 0;
1019
1020  out_stop_oplock_thread:
1021         kthread_stop(oplockThread);
1022  out_unregister_filesystem:
1023         unregister_filesystem(&cifs_fs_type);
1024  out_destroy_request_bufs:
1025         cifs_destroy_request_bufs();
1026  out_destroy_mids:
1027         cifs_destroy_mids();
1028  out_destroy_inodecache:
1029         cifs_destroy_inodecache();
1030  out_clean_proc:
1031 #ifdef CONFIG_PROC_FS
1032         cifs_proc_clean();
1033 #endif
1034         return rc;
1035 }
1036
1037 static void __exit
1038 exit_cifs(void)
1039 {
1040         cFYI(0, ("In unregister ie exit_cifs"));
1041 #ifdef CONFIG_PROC_FS
1042         cifs_proc_clean();
1043 #endif
1044         unregister_filesystem(&cifs_fs_type);
1045         cifs_destroy_inodecache();
1046         cifs_destroy_mids();
1047         cifs_destroy_request_bufs();
1048         kthread_stop(oplockThread);
1049         kthread_stop(dnotifyThread);
1050 }
1051
1052 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1053 MODULE_LICENSE("GPL");          /* combination of LGPL + GPL source behaves as GPL */
1054 MODULE_DESCRIPTION
1055     ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
1056 MODULE_VERSION(CIFS_VERSION);
1057 module_init(init_cifs)
1058 module_exit(exit_cifs)