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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 | /* * fs/cifs/cifsfs.c * * Copyright (C) International Business Machines Corp., 2002,2004 * Author(s): Steve French (sfrench@us.ibm.com) * * Common Internet FileSystem (CIFS) client * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published * by the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* Note that BB means BUGBUG (ie something to fix eventually) */ #include <linux/module.h> #include <linux/fs.h> #include <linux/mount.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/list.h> #include <linux/seq_file.h> #include <linux/vfs.h> #include <linux/mempool.h> #include "cifsfs.h" #include "cifspdu.h" #define DECLARE_GLOBALS_HERE #include "cifsglob.h" #include "cifsproto.h" #include "cifs_debug.h" #include "cifs_fs_sb.h" #include <linux/mm.h> #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */ #ifdef CONFIG_CIFS_QUOTA static struct quotactl_ops cifs_quotactl_ops; #endif int cifsFYI = 0; int cifsERROR = 1; int traceSMB = 0; unsigned int oplockEnabled = 1; unsigned int experimEnabled = 0; unsigned int linuxExtEnabled = 1; unsigned int lookupCacheEnabled = 1; unsigned int multiuser_mount = 0; unsigned int extended_security = 0; unsigned int ntlmv2_support = 0; unsigned int sign_CIFS_PDUs = 1; struct task_struct * oplockThread = NULL; unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE; module_param(CIFSMaxBufSize, int, 0); MODULE_PARM_DESC(CIFSMaxBufSize,"Network buffer size (not including header). Default: 16384 Range: 8192 to 130048"); unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL; module_param(cifs_min_rcv, int, 0); MODULE_PARM_DESC(cifs_min_rcv,"Network buffers in pool. Default: 4 Range: 1 to 64"); unsigned int cifs_min_small = 30; module_param(cifs_min_small, int, 0); MODULE_PARM_DESC(cifs_small_rcv,"Small network buffers in pool. Default: 30 Range: 2 to 256"); unsigned int cifs_max_pending = CIFS_MAX_REQ; module_param(cifs_max_pending, int, 0); MODULE_PARM_DESC(cifs_max_pending,"Simultaneous requests to server. Default: 50 Range: 2 to 256"); static DECLARE_COMPLETION(cifs_oplock_exited); static int cifs_read_super(struct super_block *sb, void *data, const char *devname, int silent) { struct inode *inode; struct cifs_sb_info *cifs_sb; int rc = 0; sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */ sb->s_fs_info = kmalloc(sizeof(struct cifs_sb_info),GFP_KERNEL); cifs_sb = CIFS_SB(sb); if(cifs_sb == NULL) return -ENOMEM; else memset(cifs_sb,0,sizeof(struct cifs_sb_info)); rc = cifs_mount(sb, cifs_sb, data, devname); if (rc) { if (!silent) cERROR(1, ("cifs_mount failed w/return code = %d", rc)); goto out_mount_failed; } sb->s_magic = CIFS_MAGIC_NUMBER; sb->s_op = &cifs_super_ops; /* if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512) sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */ #ifdef CONFIG_CIFS_QUOTA sb->s_qcop = &cifs_quotactl_ops; #endif sb->s_blocksize = CIFS_MAX_MSGSIZE; sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */ inode = iget(sb, ROOT_I); if (!inode) { rc = -ENOMEM; goto out_no_root; } sb->s_root = d_alloc_root(inode); if (!sb->s_root) { rc = -ENOMEM; goto out_no_root; } return 0; out_no_root: cERROR(1, ("cifs_read_super: get root inode failed")); if (inode) iput(inode); out_mount_failed: if(cifs_sb) { if(cifs_sb->local_nls) unload_nls(cifs_sb->local_nls); kfree(cifs_sb); } return rc; } static void cifs_put_super(struct super_block *sb) { int rc = 0; struct cifs_sb_info *cifs_sb; cFYI(1, ("In cifs_put_super")); cifs_sb = CIFS_SB(sb); if(cifs_sb == NULL) { cFYI(1,("Empty cifs superblock info passed to unmount")); return; } rc = cifs_umount(sb, cifs_sb); if (rc) { cERROR(1, ("cifs_umount failed with return code %d", rc)); } unload_nls(cifs_sb->local_nls); kfree(cifs_sb); return; } static int cifs_statfs(struct super_block *sb, struct kstatfs *buf) { int xid, rc = -EOPNOTSUPP; struct cifs_sb_info *cifs_sb; struct cifsTconInfo *pTcon; xid = GetXid(); cifs_sb = CIFS_SB(sb); pTcon = cifs_sb->tcon; buf->f_type = CIFS_MAGIC_NUMBER; /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */ buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would presumably be length of total path, note that some servers may be able to support more than this, but best to be safe since Win2k and others can not handle very long filenames */ buf->f_files = 0; /* undefined */ buf->f_ffree = 0; /* unlimited */ #ifdef CONFIG_CIFS_EXPERIMENTAL /* BB we could add a second check for a QFS Unix capability bit */ if (pTcon->ses->capabilities & CAP_UNIX) rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf, cifs_sb->local_nls); /* Only need to call the old QFSInfo if failed on newer one */ if(rc) #endif /* CIFS_EXPERIMENTAL */ rc = CIFSSMBQFSInfo(xid, pTcon, buf, cifs_sb->local_nls); /* int f_type; __fsid_t f_fsid; int f_namelen; */ /* BB get from info put in tcon struct at mount time with call to QFSAttrInfo */ FreeXid(xid); return 0; /* always return success? what if volume is no longer available? */ } static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd) { struct cifs_sb_info *cifs_sb; cifs_sb = CIFS_SB(inode->i_sb); if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) { return 0; } else /* file mode might have been restricted at mount time on the client (above and beyond ACL on servers) for servers which do not support setting and viewing mode bits, so allowing client to check permissions is useful */ return generic_permission(inode, mask, NULL); } static kmem_cache_t *cifs_inode_cachep; static kmem_cache_t *cifs_req_cachep; static kmem_cache_t *cifs_mid_cachep; kmem_cache_t *cifs_oplock_cachep; static kmem_cache_t *cifs_sm_req_cachep; mempool_t *cifs_sm_req_poolp; mempool_t *cifs_req_poolp; mempool_t *cifs_mid_poolp; static struct inode * cifs_alloc_inode(struct super_block *sb) { struct cifsInodeInfo *cifs_inode; cifs_inode = (struct cifsInodeInfo *) kmem_cache_alloc(cifs_inode_cachep, SLAB_KERNEL); if (!cifs_inode) return NULL; cifs_inode->cifsAttrs = 0x20; /* default */ atomic_set(&cifs_inode->inUse, 0); cifs_inode->time = 0; /* Until the file is open and we have gotten oplock info back from the server, can not assume caching of file data or metadata */ cifs_inode->clientCanCacheRead = FALSE; cifs_inode->clientCanCacheAll = FALSE; cifs_inode->vfs_inode.i_blksize = CIFS_MAX_MSGSIZE; cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */ INIT_LIST_HEAD(&cifs_inode->openFileList); return &cifs_inode->vfs_inode; } static void cifs_destroy_inode(struct inode *inode) { kmem_cache_free(cifs_inode_cachep, CIFS_I(inode)); } /* * cifs_show_options() is for displaying mount options in /proc/mounts. * Not all settable options are displayed but most of the important * ones are. */ static int cifs_show_options(struct seq_file *s, struct vfsmount *m) { struct cifs_sb_info *cifs_sb; cifs_sb = CIFS_SB(m->mnt_sb); if (cifs_sb) { if (cifs_sb->tcon) { seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName); if (cifs_sb->tcon->ses) { if (cifs_sb->tcon->ses->userName) seq_printf(s, ",username=%s", cifs_sb->tcon->ses->userName); if(cifs_sb->tcon->ses->domainName) seq_printf(s, ",domain=%s", cifs_sb->tcon->ses->domainName); } } seq_printf(s, ",rsize=%d",cifs_sb->rsize); seq_printf(s, ",wsize=%d",cifs_sb->wsize); } return 0; } #ifdef CONFIG_CIFS_QUOTA int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid, struct fs_disk_quota * pdquota) { int xid; int rc = 0; struct cifs_sb_info *cifs_sb = CIFS_SB(sb); struct cifsTconInfo *pTcon; if(cifs_sb) pTcon = cifs_sb->tcon; else return -EIO; xid = GetXid(); if(pTcon) { cFYI(1,("set type: 0x%x id: %d",quota_type,qid)); } else { return -EIO; } FreeXid(xid); return rc; } int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid, struct fs_disk_quota * pdquota) { int xid; int rc = 0; struct cifs_sb_info *cifs_sb = CIFS_SB(sb); struct cifsTconInfo *pTcon; if(cifs_sb) pTcon = cifs_sb->tcon; else return -EIO; xid = GetXid(); if(pTcon) { cFYI(1,("set type: 0x%x id: %d",quota_type,qid)); } else { rc = -EIO; } FreeXid(xid); return rc; } int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation) { int xid; int rc = 0; struct cifs_sb_info *cifs_sb = CIFS_SB(sb); struct cifsTconInfo *pTcon; if(cifs_sb) pTcon = cifs_sb->tcon; else return -EIO; xid = GetXid(); if(pTcon) { cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation)); } else { rc = -EIO; } FreeXid(xid); return rc; } int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats) { int xid; int rc = 0; struct cifs_sb_info *cifs_sb = CIFS_SB(sb); struct cifsTconInfo *pTcon; if(cifs_sb) { pTcon = cifs_sb->tcon; } else { return -EIO; } xid = GetXid(); if(pTcon) { cFYI(1,("pqstats %p",qstats)); } else { rc = -EIO; } FreeXid(xid); return rc; } static struct quotactl_ops cifs_quotactl_ops = { .set_xquota = cifs_xquota_set, .get_xquota = cifs_xquota_set, .set_xstate = cifs_xstate_set, .get_xstate = cifs_xstate_get, }; #endif static int cifs_remount(struct super_block *sb, int *flags, char *data) { *flags |= MS_NODIRATIME; return 0; } struct super_operations cifs_super_ops = { .read_inode = cifs_read_inode, .put_super = cifs_put_super, .statfs = cifs_statfs, .alloc_inode = cifs_alloc_inode, .destroy_inode = cifs_destroy_inode, /* .drop_inode = generic_delete_inode, .delete_inode = cifs_delete_inode, *//* Do not need the above two functions unless later we add lazy close of inodes or unless the kernel forgets to call us with the same number of releases (closes) as opens */ .show_options = cifs_show_options, /* .umount_begin = cifs_umount_begin, *//* consider adding in the future */ .remount_fs = cifs_remount, }; static struct super_block * cifs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { int rc; struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL); cFYI(1, ("Devname: %s flags: %d ", dev_name, flags)); if (IS_ERR(sb)) return sb; sb->s_flags = flags; rc = cifs_read_super(sb, data, dev_name, flags & MS_VERBOSE ? 1 : 0); if (rc) { up_write(&sb->s_umount); deactivate_super(sb); return ERR_PTR(rc); } sb->s_flags |= MS_ACTIVE; return sb; } static ssize_t cifs_read_wrapper(struct file * file, char __user *read_data, size_t read_size, loff_t * poffset) { if(file == NULL) return -EIO; else if(file->f_dentry == NULL) return -EIO; else if(file->f_dentry->d_inode == NULL) return -EIO; cFYI(1,("In read_wrapper size %zd at %lld",read_size,*poffset)); #ifdef CONFIG_CIFS_EXPERIMENTAL /* check whether we can cache writes locally */ if(file->f_dentry->d_sb) { struct cifs_sb_info *cifs_sb; cifs_sb = CIFS_SB(file->f_dentry->d_sb); if(cifs_sb != NULL) { if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) return cifs_user_read(file,read_data, read_size,poffset); } } #endif /* CIFS_EXPERIMENTAL */ if(CIFS_I(file->f_dentry->d_inode)->clientCanCacheRead) { return generic_file_read(file,read_data,read_size,poffset); } else { /* BB do we need to lock inode from here until after invalidate? */ /* if(file->f_dentry->d_inode->i_mapping) { filemap_fdatawrite(file->f_dentry->d_inode->i_mapping); filemap_fdatawait(file->f_dentry->d_inode->i_mapping); }*/ /* cifs_revalidate(file->f_dentry);*/ /* BB fixme */ /* BB we should make timer configurable - perhaps by simply calling cifs_revalidate here */ /* invalidate_remote_inode(file->f_dentry->d_inode);*/ return generic_file_read(file,read_data,read_size,poffset); } } static ssize_t cifs_write_wrapper(struct file * file, const char __user *write_data, size_t write_size, loff_t * poffset) { ssize_t written; if(file == NULL) return -EIO; else if(file->f_dentry == NULL) return -EIO; else if(file->f_dentry->d_inode == NULL) return -EIO; cFYI(1,("In write_wrapper size %zd at %lld",write_size,*poffset)); #ifdef CONFIG_CIFS_EXPERIMENTAL /* BB fixme - fix user char * to kernel char * mapping here BB */ /* check whether we can cache writes locally */ if(file->f_dentry->d_sb) { struct cifs_sb_info *cifs_sb; cifs_sb = CIFS_SB(file->f_dentry->d_sb); if(cifs_sb != NULL) { if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { return cifs_user_write(file,write_data, write_size,poffset); } } } #endif /* CIFS_EXPERIMENTAL */ written = generic_file_write(file,write_data,write_size,poffset); if(!CIFS_I(file->f_dentry->d_inode)->clientCanCacheAll) { if(file->f_dentry->d_inode->i_mapping) { filemap_fdatawrite(file->f_dentry->d_inode->i_mapping); } } return written; } static struct file_system_type cifs_fs_type = { .owner = THIS_MODULE, .name = "cifs", .get_sb = cifs_get_sb, .kill_sb = kill_anon_super, /* .fs_flags */ }; struct inode_operations cifs_dir_inode_ops = { .create = cifs_create, .lookup = cifs_lookup, .getattr = cifs_getattr, .unlink = cifs_unlink, .link = cifs_hardlink, .mkdir = cifs_mkdir, .rmdir = cifs_rmdir, .rename = cifs_rename, .permission = cifs_permission, /* revalidate:cifs_revalidate, */ .setattr = cifs_setattr, .symlink = cifs_symlink, .mknod = cifs_mknod, #ifdef CONFIG_CIFS_XATTR .setxattr = cifs_setxattr, .getxattr = cifs_getxattr, .listxattr = cifs_listxattr, .removexattr = cifs_removexattr, #endif }; struct inode_operations cifs_file_inode_ops = { /* revalidate:cifs_revalidate, */ .setattr = cifs_setattr, .getattr = cifs_getattr, /* do we need this anymore? */ .rename = cifs_rename, .permission = cifs_permission, #ifdef CONFIG_CIFS_XATTR .setxattr = cifs_setxattr, .getxattr = cifs_getxattr, .listxattr = cifs_listxattr, .removexattr = cifs_removexattr, #endif }; struct inode_operations cifs_symlink_inode_ops = { .readlink = generic_readlink, .follow_link = cifs_follow_link, .put_link = cifs_put_link, .permission = cifs_permission, /* BB add the following two eventually */ /* revalidate: cifs_revalidate, setattr: cifs_notify_change, *//* BB do we need notify change */ #ifdef CONFIG_CIFS_XATTR .setxattr = cifs_setxattr, .getxattr = cifs_getxattr, .listxattr = cifs_listxattr, .removexattr = cifs_removexattr, #endif }; struct file_operations cifs_file_ops = { .read = cifs_read_wrapper, .write = cifs_write_wrapper, .open = cifs_open, .release = cifs_close, .lock = cifs_lock, .fsync = cifs_fsync, .flush = cifs_flush, .mmap = cifs_file_mmap, .sendfile = generic_file_sendfile, #ifdef CONFIG_CIFS_EXPERIMENTAL .dir_notify = cifs_dir_notify, #endif /* CONFIG_CIFS_EXPERIMENTAL */ }; struct file_operations cifs_dir_ops = { .readdir = cifs_readdir, .release = cifs_closedir, .read = generic_read_dir, #ifdef CONFIG_CIFS_EXPERIMENTAL .dir_notify = cifs_dir_notify, #endif /* CONFIG_CIFS_EXPERIMENTAL */ }; static void cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags) { struct cifsInodeInfo *cifsi = (struct cifsInodeInfo *) inode; if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR) { inode_init_once(&cifsi->vfs_inode); INIT_LIST_HEAD(&cifsi->lockList); } } static int cifs_init_inodecache(void) { cifs_inode_cachep = kmem_cache_create("cifs_inode_cache", sizeof (struct cifsInodeInfo), 0, SLAB_RECLAIM_ACCOUNT, cifs_init_once, NULL); if (cifs_inode_cachep == NULL) return -ENOMEM; return 0; } static void cifs_destroy_inodecache(void) { if (kmem_cache_destroy(cifs_inode_cachep)) printk(KERN_WARNING "cifs_inode_cache: error freeing\n"); } static int cifs_init_request_bufs(void) { if(CIFSMaxBufSize < 8192) { /* Buffer size can not be smaller than 2 * PATH_MAX since maximum Unicode path name has to fit in any SMB/CIFS path based frames */ CIFSMaxBufSize = 8192; } else if (CIFSMaxBufSize > 1024*127) { CIFSMaxBufSize = 1024 * 127; } else { CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/ } /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */ cifs_req_cachep = kmem_cache_create("cifs_request", CIFSMaxBufSize + MAX_CIFS_HDR_SIZE, 0, SLAB_HWCACHE_ALIGN, NULL, NULL); if (cifs_req_cachep == NULL) return -ENOMEM; if(cifs_min_rcv < 1) cifs_min_rcv = 1; else if (cifs_min_rcv > 64) { cifs_min_rcv = 64; cFYI(1,("cifs_min_rcv set to maximum (64)")); } cifs_req_poolp = mempool_create(cifs_min_rcv, mempool_alloc_slab, mempool_free_slab, cifs_req_cachep); if(cifs_req_poolp == NULL) { kmem_cache_destroy(cifs_req_cachep); return -ENOMEM; } /* 256 (MAX_CIFS_HDR_SIZE bytes is enough for most SMB responses and almost all handle based requests (but not write response, nor is it sufficient for path based requests). A smaller size would have been more efficient (compacting multiple slab items on one 4k page) for the case in which debug was on, but this larger size allows more SMBs to use small buffer alloc and is still much more efficient to alloc 1 per page off the slab compared to 17K (5page) alloc of large cifs buffers even when page debugging is on */ cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq", MAX_CIFS_HDR_SIZE, 0, SLAB_HWCACHE_ALIGN, NULL, NULL); if (cifs_sm_req_cachep == NULL) { mempool_destroy(cifs_req_poolp); kmem_cache_destroy(cifs_req_cachep); return -ENOMEM; } if(cifs_min_small < 2) cifs_min_small = 2; else if (cifs_min_small > 256) { cifs_min_small = 256; cFYI(1,("cifs_min_small set to maximum (256)")); } cifs_sm_req_poolp = mempool_create(cifs_min_small, mempool_alloc_slab, mempool_free_slab, cifs_sm_req_cachep); if(cifs_sm_req_poolp == NULL) { mempool_destroy(cifs_req_poolp); kmem_cache_destroy(cifs_req_cachep); kmem_cache_destroy(cifs_sm_req_cachep); return -ENOMEM; } return 0; } static void cifs_destroy_request_bufs(void) { mempool_destroy(cifs_req_poolp); if (kmem_cache_destroy(cifs_req_cachep)) printk(KERN_WARNING "cifs_destroy_request_cache: error not all structures were freed\n"); mempool_destroy(cifs_sm_req_poolp); if (kmem_cache_destroy(cifs_sm_req_cachep)) printk(KERN_WARNING "cifs_destroy_request_cache: cifs_small_rq free error\n"); } static int cifs_init_mids(void) { cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids", sizeof (struct mid_q_entry), 0, SLAB_HWCACHE_ALIGN, NULL, NULL); if (cifs_mid_cachep == NULL) return -ENOMEM; cifs_mid_poolp = mempool_create(3 /* a reasonable min simultan opers */, mempool_alloc_slab, mempool_free_slab, cifs_mid_cachep); if(cifs_mid_poolp == NULL) { kmem_cache_destroy(cifs_mid_cachep); return -ENOMEM; } cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs", sizeof (struct oplock_q_entry), 0, SLAB_HWCACHE_ALIGN, NULL, NULL); if (cifs_oplock_cachep == NULL) { kmem_cache_destroy(cifs_mid_cachep); mempool_destroy(cifs_mid_poolp); return -ENOMEM; } return 0; } static void cifs_destroy_mids(void) { mempool_destroy(cifs_mid_poolp); if (kmem_cache_destroy(cifs_mid_cachep)) printk(KERN_WARNING "cifs_destroy_mids: error not all structures were freed\n"); if (kmem_cache_destroy(cifs_oplock_cachep)) printk(KERN_WARNING "error not all oplock structures were freed\n"); } static int cifs_oplock_thread(void * dummyarg) { struct oplock_q_entry * oplock_item; struct cifsTconInfo *pTcon; struct inode * inode; __u16 netfid; int rc; daemonize("cifsoplockd"); allow_signal(SIGTERM); oplockThread = current; do { set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(1*HZ); spin_lock(&GlobalMid_Lock); if(list_empty(&GlobalOplock_Q)) { spin_unlock(&GlobalMid_Lock); set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(39*HZ); } else { oplock_item = list_entry(GlobalOplock_Q.next, struct oplock_q_entry, qhead); if(oplock_item) { cFYI(1,("found oplock item to write out")); pTcon = oplock_item->tcon; inode = oplock_item->pinode; netfid = oplock_item->netfid; spin_unlock(&GlobalMid_Lock); DeleteOplockQEntry(oplock_item); /* can not grab inode sem here since it would deadlock when oplock received on delete since vfs_unlink holds the i_sem across the call */ /* down(&inode->i_sem);*/ if (S_ISREG(inode->i_mode)) { rc = filemap_fdatawrite(inode->i_mapping); if(CIFS_I(inode)->clientCanCacheRead == 0) { filemap_fdatawait(inode->i_mapping); invalidate_remote_inode(inode); } } else rc = 0; /* up(&inode->i_sem);*/ if (rc) CIFS_I(inode)->write_behind_rc = rc; cFYI(1,("Oplock flush inode %p rc %d",inode,rc)); /* releasing a stale oplock after recent reconnection of smb session using a now incorrect file handle is not a data integrity issue but do not bother sending an oplock release if session to server still is disconnected since oplock already released by the server in that case */ if(pTcon->tidStatus != CifsNeedReconnect) { rc = CIFSSMBLock(0, pTcon, netfid, 0 /* len */ , 0 /* offset */, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, 0 /* wait flag */); cFYI(1,("Oplock release rc = %d ",rc)); } } else spin_unlock(&GlobalMid_Lock); } } while(!signal_pending(current)); complete_and_exit (&cifs_oplock_exited, 0); } static int __init init_cifs(void) { int rc = 0; #ifdef CONFIG_PROC_FS cifs_proc_init(); #endif INIT_LIST_HEAD(&GlobalServerList); /* BB not implemented yet */ INIT_LIST_HEAD(&GlobalSMBSessionList); INIT_LIST_HEAD(&GlobalTreeConnectionList); INIT_LIST_HEAD(&GlobalOplock_Q); /* * Initialize Global counters */ atomic_set(&sesInfoAllocCount, 0); atomic_set(&tconInfoAllocCount, 0); atomic_set(&tcpSesAllocCount,0); atomic_set(&tcpSesReconnectCount, 0); atomic_set(&tconInfoReconnectCount, 0); atomic_set(&bufAllocCount, 0); atomic_set(&midCount, 0); GlobalCurrentXid = 0; GlobalTotalActiveXid = 0; GlobalMaxActiveXid = 0; rwlock_init(&GlobalSMBSeslock); spin_lock_init(&GlobalMid_Lock); if(cifs_max_pending < 2) { cifs_max_pending = 2; cFYI(1,("cifs_max_pending set to min of 2")); } else if(cifs_max_pending > 256) { cifs_max_pending = 256; cFYI(1,("cifs_max_pending set to max of 256")); } rc = cifs_init_inodecache(); if (!rc) { rc = cifs_init_mids(); if (!rc) { rc = cifs_init_request_bufs(); if (!rc) { rc = register_filesystem(&cifs_fs_type); if (!rc) { rc = (int)kernel_thread(cifs_oplock_thread, NULL, CLONE_FS | CLONE_FILES | CLONE_VM); if(rc > 0) return 0; else cERROR(1,("error %d create oplock thread",rc)); } cifs_destroy_request_bufs(); } cifs_destroy_mids(); } cifs_destroy_inodecache(); } #ifdef CONFIG_PROC_FS cifs_proc_clean(); #endif return rc; } static void __exit exit_cifs(void) { cFYI(0, ("In unregister ie exit_cifs")); #ifdef CONFIG_PROC_FS cifs_proc_clean(); #endif unregister_filesystem(&cifs_fs_type); cifs_destroy_inodecache(); cifs_destroy_mids(); cifs_destroy_request_bufs(); if(oplockThread) { send_sig(SIGTERM, oplockThread, 1); wait_for_completion(&cifs_oplock_exited); } } MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>"); MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */ MODULE_DESCRIPTION ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows"); MODULE_VERSION(CIFS_VERSION); module_init(init_cifs) module_exit(exit_cifs) |