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         inode_init_once(&cifsi->vfs_inode);
 705         INIT_LIST_HEAD(&cifsi->lockList);
 706 }
 707
 708 static int
 709 cifs_init_inodecache(void)
 710 {
 711         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 712                                               sizeof (struct cifsInodeInfo),
 713                                               0, (SLAB_RECLAIM_ACCOUNT|
 714                                                 SLAB_MEM_SPREAD),
 715                                               cifs_init_once, NULL);
 716         if (cifs_inode_cachep == NULL)
 717                 return -ENOMEM;
 718
 719         return 0;
 720 }
 721
 722 static void
 723 cifs_destroy_inodecache(void)
 724 {
 725         kmem_cache_destroy(cifs_inode_cachep);
 726 }
 727
 728 static int
 729 cifs_init_request_bufs(void)
 730 {
 731         if (CIFSMaxBufSize < 8192) {
 732         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 733         Unicode path name has to fit in any SMB/CIFS path based frames */
 734                 CIFSMaxBufSize = 8192;
 735         } else if (CIFSMaxBufSize > 1024*127) {
 736                 CIFSMaxBufSize = 1024 * 127;
 737         } else {
 738                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 739         }
 740 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 741         cifs_req_cachep = kmem_cache_create("cifs_request",
 742                                             CIFSMaxBufSize +
 743                                             MAX_CIFS_HDR_SIZE, 0,
 744                                             SLAB_HWCACHE_ALIGN, NULL, NULL);
 745         if (cifs_req_cachep == NULL)
 746                 return -ENOMEM;
 747
 748         if (cifs_min_rcv < 1)
 749                 cifs_min_rcv = 1;
 750         else if (cifs_min_rcv > 64) {
 751                 cifs_min_rcv = 64;
 752                 cERROR(1,("cifs_min_rcv set to maximum (64)"));
 753         }
 754
 755         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 756                                                   cifs_req_cachep);
 757
 758         if (cifs_req_poolp == NULL) {
 759                 kmem_cache_destroy(cifs_req_cachep);
 760                 return -ENOMEM;
 761         }
 762         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 763         almost all handle based requests (but not write response, nor is it
 764         sufficient for path based requests).  A smaller size would have
 765         been more efficient (compacting multiple slab items on one 4k page)
 766         for the case in which debug was on, but this larger size allows
 767         more SMBs to use small buffer alloc and is still much more
 768         efficient to alloc 1 per page off the slab compared to 17K (5page)
 769         alloc of large cifs buffers even when page debugging is on */
 770         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 771                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 772                         NULL, NULL);
 773         if (cifs_sm_req_cachep == NULL) {
 774                 mempool_destroy(cifs_req_poolp);
 775                 kmem_cache_destroy(cifs_req_cachep);
 776                 return -ENOMEM;
 777         }
 778
 779         if (cifs_min_small < 2)
 780                 cifs_min_small = 2;
 781         else if (cifs_min_small > 256) {
 782                 cifs_min_small = 256;
 783                 cFYI(1,("cifs_min_small set to maximum (256)"));
 784         }
 785
 786         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 787                                                      cifs_sm_req_cachep);
 788
 789         if (cifs_sm_req_poolp == NULL) {
 790                 mempool_destroy(cifs_req_poolp);
 791                 kmem_cache_destroy(cifs_req_cachep);
 792                 kmem_cache_destroy(cifs_sm_req_cachep);
 793                 return -ENOMEM;
 794         }
 795
 796         return 0;
 797 }
 798
 799 static void
 800 cifs_destroy_request_bufs(void)
 801 {
 802         mempool_destroy(cifs_req_poolp);
 803         kmem_cache_destroy(cifs_req_cachep);
 804         mempool_destroy(cifs_sm_req_poolp);
 805         kmem_cache_destroy(cifs_sm_req_cachep);
 806 }
 807
 808 static int
 809 cifs_init_mids(void)
 810 {
 811         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 812                                 sizeof (struct mid_q_entry), 0,
 813                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 814         if (cifs_mid_cachep == NULL)
 815                 return -ENOMEM;
 816
 817         /* 3 is a reasonable minimum number of simultaneous operations */
 818         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 819         if (cifs_mid_poolp == NULL) {
 820                 kmem_cache_destroy(cifs_mid_cachep);
 821                 return -ENOMEM;
 822         }
 823
 824         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 825                                 sizeof (struct oplock_q_entry), 0,
 826                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 827         if (cifs_oplock_cachep == NULL) {
 828                 kmem_cache_destroy(cifs_mid_cachep);
 829                 mempool_destroy(cifs_mid_poolp);
 830                 return -ENOMEM;
 831         }
 832
 833         return 0;
 834 }
 835
 836 static void
 837 cifs_destroy_mids(void)
 838 {
 839         mempool_destroy(cifs_mid_poolp);
 840         kmem_cache_destroy(cifs_mid_cachep);
 841         kmem_cache_destroy(cifs_oplock_cachep);
 842 }
 843
 844 static int cifs_oplock_thread(void * dummyarg)
 845 {
 846         struct oplock_q_entry * oplock_item;
 847         struct cifsTconInfo *pTcon;
 848         struct inode * inode;
 849         __u16  netfid;
 850         int rc;
 851
 852         do {
 853                 if (try_to_freeze())
 854                         continue;
 855
 856                 spin_lock(&GlobalMid_Lock);
 857                 if (list_empty(&GlobalOplock_Q)) {
 858                         spin_unlock(&GlobalMid_Lock);
 859                         set_current_state(TASK_INTERRUPTIBLE);
 860                         schedule_timeout(39*HZ);
 861                 } else {
 862                         oplock_item = list_entry(GlobalOplock_Q.next,
 863                                 struct oplock_q_entry, qhead);
 864                         if (oplock_item) {
 865                                 cFYI(1,("found oplock item to write out"));
 866                                 pTcon = oplock_item->tcon;
 867                                 inode = oplock_item->pinode;
 868                                 netfid = oplock_item->netfid;
 869                                 spin_unlock(&GlobalMid_Lock);
 870                                 DeleteOplockQEntry(oplock_item);
 871                                 /* can not grab inode sem here since it would
 872                                 deadlock when oplock received on delete
 873                                 since vfs_unlink holds the i_mutex across
 874                                 the call */
 875                                 /* mutex_lock(&inode->i_mutex);*/
 876                                 if (S_ISREG(inode->i_mode)) {
 877                                         rc = filemap_fdatawrite(inode->i_mapping);
 878                                         if (CIFS_I(inode)->clientCanCacheRead == 0) {
 879                                                 filemap_fdatawait(inode->i_mapping);
 880                                                 invalidate_remote_inode(inode);
 881                                         }
 882                                 } else
 883                                         rc = 0;
 884                                 /* mutex_unlock(&inode->i_mutex);*/
 885                                 if (rc)
 886                                         CIFS_I(inode)->write_behind_rc = rc;
 887                                 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
 888
 889                                 /* releasing a stale oplock after recent reconnection
 890                                 of smb session using a now incorrect file
 891                                 handle is not a data integrity issue but do
 892                                 not bother sending an oplock release if session
 893                                 to server still is disconnected since oplock
 894                                 already released by the server in that case */
 895                                 if (pTcon->tidStatus != CifsNeedReconnect) {
 896                                     rc = CIFSSMBLock(0, pTcon, netfid,
 897                                             0 /* len */ , 0 /* offset */, 0,
 898                                             0, LOCKING_ANDX_OPLOCK_RELEASE,
 899                                             0 /* wait flag */);
 900                                         cFYI(1,("Oplock release rc = %d ",rc));
 901                                 }
 902                         } else
 903                                 spin_unlock(&GlobalMid_Lock);
 904                         set_current_state(TASK_INTERRUPTIBLE);
 905                         schedule_timeout(1);  /* yield in case q were corrupt */
 906                 }
 907         } while (!kthread_should_stop());
 908
 909         return 0;
 910 }
 911
 912 static int cifs_dnotify_thread(void * dummyarg)
 913 {
 914         struct list_head *tmp;
 915         struct cifsSesInfo *ses;
 916
 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 (!kthread_should_stop());
 935
 936         return 0;
 937 }
 938
 939 static int __init
 940 init_cifs(void)
 941 {
 942         int rc = 0;
 943 #ifdef CONFIG_PROC_FS
 944         cifs_proc_init();
 945 #endif
 946 /*      INIT_LIST_HEAD(&GlobalServerList);*/    /* BB not implemented yet */
 947         INIT_LIST_HEAD(&GlobalSMBSessionList);
 948         INIT_LIST_HEAD(&GlobalTreeConnectionList);
 949         INIT_LIST_HEAD(&GlobalOplock_Q);
 950 #ifdef CONFIG_CIFS_EXPERIMENTAL
 951         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 952         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 953 #endif
 954 /*
 955  *  Initialize Global counters
 956  */
 957         atomic_set(&sesInfoAllocCount, 0);
 958         atomic_set(&tconInfoAllocCount, 0);
 959         atomic_set(&tcpSesAllocCount,0);
 960         atomic_set(&tcpSesReconnectCount, 0);
 961         atomic_set(&tconInfoReconnectCount, 0);
 962
 963         atomic_set(&bufAllocCount, 0);
 964         atomic_set(&smBufAllocCount, 0);
 965 #ifdef CONFIG_CIFS_STATS2
 966         atomic_set(&totBufAllocCount, 0);
 967         atomic_set(&totSmBufAllocCount, 0);
 968 #endif /* CONFIG_CIFS_STATS2 */
 969
 970         atomic_set(&midCount, 0);
 971         GlobalCurrentXid = 0;
 972         GlobalTotalActiveXid = 0;
 973         GlobalMaxActiveXid = 0;
 974         memset(Local_System_Name, 0, 15);
 975         rwlock_init(&GlobalSMBSeslock);
 976         spin_lock_init(&GlobalMid_Lock);
 977
 978         if (cifs_max_pending < 2) {
 979                 cifs_max_pending = 2;
 980                 cFYI(1,("cifs_max_pending set to min of 2"));
 981         } else if (cifs_max_pending > 256) {
 982                 cifs_max_pending = 256;
 983                 cFYI(1,("cifs_max_pending set to max of 256"));
 984         }
 985
 986         rc = cifs_init_inodecache();
 987         if (rc)
 988                 goto out_clean_proc;
 989
 990         rc = cifs_init_mids();
 991         if (rc)
 992                 goto out_destroy_inodecache;
 993
 994         rc = cifs_init_request_bufs();
 995         if (rc)
 996                 goto out_destroy_mids;
 997
 998         rc = register_filesystem(&cifs_fs_type);
 999         if (rc)
1000                 goto out_destroy_request_bufs;
1001
1002         oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1003         if (IS_ERR(oplockThread)) {
1004                 rc = PTR_ERR(oplockThread);
1005                 cERROR(1,("error %d create oplock thread", rc));
1006                 goto out_unregister_filesystem;
1007         }
1008
1009         dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
1010         if (IS_ERR(dnotifyThread)) {
1011                 rc = PTR_ERR(dnotifyThread);
1012                 cERROR(1,("error %d create dnotify thread", rc));
1013                 goto out_stop_oplock_thread;
1014         }
1015
1016         return 0;
1017
1018  out_stop_oplock_thread:
1019         kthread_stop(oplockThread);
1020  out_unregister_filesystem:
1021         unregister_filesystem(&cifs_fs_type);
1022  out_destroy_request_bufs:
1023         cifs_destroy_request_bufs();
1024  out_destroy_mids:
1025         cifs_destroy_mids();
1026  out_destroy_inodecache:
1027         cifs_destroy_inodecache();
1028  out_clean_proc:
1029 #ifdef CONFIG_PROC_FS
1030         cifs_proc_clean();
1031 #endif
1032         return rc;
1033 }
1034
1035 static void __exit
1036 exit_cifs(void)
1037 {
1038         cFYI(0, ("In unregister ie exit_cifs"));
1039 #ifdef CONFIG_PROC_FS
1040         cifs_proc_clean();
1041 #endif
1042         unregister_filesystem(&cifs_fs_type);
1043         cifs_destroy_inodecache();
1044         cifs_destroy_mids();
1045         cifs_destroy_request_bufs();
1046         kthread_stop(oplockThread);
1047         kthread_stop(dnotifyThread);
1048 }
1049
1050 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1051 MODULE_LICENSE("GPL");          /* combination of LGPL + GPL source behaves as GPL */
1052 MODULE_DESCRIPTION
1053     ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
1054 MODULE_VERSION(CIFS_VERSION);
1055 module_init(init_cifs)
1056 module_exit(exit_cifs)