| 1 | /* |
| 2 | * fs/cifs/cifsfs.c |
| 3 | * |
| 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
| 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 <linux/smp_lock.h> |
| 39 | #include "cifsfs.h" |
| 40 | #include "cifspdu.h" |
| 41 | #define DECLARE_GLOBALS_HERE |
| 42 | #include "cifsglob.h" |
| 43 | #include "cifsproto.h" |
| 44 | #include "cifs_debug.h" |
| 45 | #include "cifs_fs_sb.h" |
| 46 | #include <linux/mm.h> |
| 47 | #include <linux/key-type.h> |
| 48 | #include "dns_resolve.h" |
| 49 | #include "cifs_spnego.h" |
| 50 | #include "fscache.h" |
| 51 | #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */ |
| 52 | |
| 53 | int cifsFYI = 0; |
| 54 | int cifsERROR = 1; |
| 55 | int traceSMB = 0; |
| 56 | unsigned int oplockEnabled = 1; |
| 57 | unsigned int experimEnabled = 0; |
| 58 | unsigned int linuxExtEnabled = 1; |
| 59 | unsigned int lookupCacheEnabled = 1; |
| 60 | unsigned int multiuser_mount = 0; |
| 61 | unsigned int global_secflags = CIFSSEC_DEF; |
| 62 | /* unsigned int ntlmv2_support = 0; */ |
| 63 | unsigned int sign_CIFS_PDUs = 1; |
| 64 | static const struct super_operations cifs_super_ops; |
| 65 | unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE; |
| 66 | module_param(CIFSMaxBufSize, int, 0); |
| 67 | MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). " |
| 68 | "Default: 16384 Range: 8192 to 130048"); |
| 69 | unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL; |
| 70 | module_param(cifs_min_rcv, int, 0); |
| 71 | MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: " |
| 72 | "1 to 64"); |
| 73 | unsigned int cifs_min_small = 30; |
| 74 | module_param(cifs_min_small, int, 0); |
| 75 | MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 " |
| 76 | "Range: 2 to 256"); |
| 77 | unsigned int cifs_max_pending = CIFS_MAX_REQ; |
| 78 | module_param(cifs_max_pending, int, 0); |
| 79 | MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. " |
| 80 | "Default: 50 Range: 2 to 256"); |
| 81 | |
| 82 | extern mempool_t *cifs_sm_req_poolp; |
| 83 | extern mempool_t *cifs_req_poolp; |
| 84 | extern mempool_t *cifs_mid_poolp; |
| 85 | |
| 86 | static int |
| 87 | cifs_read_super(struct super_block *sb, void *data, |
| 88 | const char *devname, int silent) |
| 89 | { |
| 90 | struct inode *inode; |
| 91 | struct cifs_sb_info *cifs_sb; |
| 92 | int rc = 0; |
| 93 | |
| 94 | /* BB should we make this contingent on mount parm? */ |
| 95 | sb->s_flags |= MS_NODIRATIME | MS_NOATIME; |
| 96 | sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL); |
| 97 | cifs_sb = CIFS_SB(sb); |
| 98 | if (cifs_sb == NULL) |
| 99 | return -ENOMEM; |
| 100 | |
| 101 | rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY); |
| 102 | if (rc) { |
| 103 | kfree(cifs_sb); |
| 104 | return rc; |
| 105 | } |
| 106 | |
| 107 | #ifdef CONFIG_CIFS_DFS_UPCALL |
| 108 | /* copy mount params to sb for use in submounts */ |
| 109 | /* BB: should we move this after the mount so we |
| 110 | * do not have to do the copy on failed mounts? |
| 111 | * BB: May be it is better to do simple copy before |
| 112 | * complex operation (mount), and in case of fail |
| 113 | * just exit instead of doing mount and attempting |
| 114 | * undo it if this copy fails?*/ |
| 115 | if (data) { |
| 116 | int len = strlen(data); |
| 117 | cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL); |
| 118 | if (cifs_sb->mountdata == NULL) { |
| 119 | bdi_destroy(&cifs_sb->bdi); |
| 120 | kfree(sb->s_fs_info); |
| 121 | sb->s_fs_info = NULL; |
| 122 | return -ENOMEM; |
| 123 | } |
| 124 | strncpy(cifs_sb->mountdata, data, len + 1); |
| 125 | cifs_sb->mountdata[len] = '\0'; |
| 126 | } |
| 127 | #endif |
| 128 | |
| 129 | rc = cifs_mount(sb, cifs_sb, data, devname); |
| 130 | |
| 131 | if (rc) { |
| 132 | if (!silent) |
| 133 | cERROR(1, "cifs_mount failed w/return code = %d", rc); |
| 134 | goto out_mount_failed; |
| 135 | } |
| 136 | |
| 137 | sb->s_magic = CIFS_MAGIC_NUMBER; |
| 138 | sb->s_op = &cifs_super_ops; |
| 139 | sb->s_bdi = &cifs_sb->bdi; |
| 140 | /* if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512) |
| 141 | sb->s_blocksize = |
| 142 | cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */ |
| 143 | sb->s_blocksize = CIFS_MAX_MSGSIZE; |
| 144 | sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */ |
| 145 | inode = cifs_root_iget(sb, ROOT_I); |
| 146 | |
| 147 | if (IS_ERR(inode)) { |
| 148 | rc = PTR_ERR(inode); |
| 149 | inode = NULL; |
| 150 | goto out_no_root; |
| 151 | } |
| 152 | |
| 153 | sb->s_root = d_alloc_root(inode); |
| 154 | |
| 155 | if (!sb->s_root) { |
| 156 | rc = -ENOMEM; |
| 157 | goto out_no_root; |
| 158 | } |
| 159 | |
| 160 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
| 161 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { |
| 162 | cFYI(1, "export ops supported"); |
| 163 | sb->s_export_op = &cifs_export_ops; |
| 164 | } |
| 165 | #endif /* EXPERIMENTAL */ |
| 166 | |
| 167 | return 0; |
| 168 | |
| 169 | out_no_root: |
| 170 | cERROR(1, "cifs_read_super: get root inode failed"); |
| 171 | if (inode) |
| 172 | iput(inode); |
| 173 | |
| 174 | cifs_umount(sb, cifs_sb); |
| 175 | |
| 176 | out_mount_failed: |
| 177 | if (cifs_sb) { |
| 178 | #ifdef CONFIG_CIFS_DFS_UPCALL |
| 179 | if (cifs_sb->mountdata) { |
| 180 | kfree(cifs_sb->mountdata); |
| 181 | cifs_sb->mountdata = NULL; |
| 182 | } |
| 183 | #endif |
| 184 | unload_nls(cifs_sb->local_nls); |
| 185 | bdi_destroy(&cifs_sb->bdi); |
| 186 | kfree(cifs_sb); |
| 187 | } |
| 188 | return rc; |
| 189 | } |
| 190 | |
| 191 | static void |
| 192 | cifs_put_super(struct super_block *sb) |
| 193 | { |
| 194 | int rc = 0; |
| 195 | struct cifs_sb_info *cifs_sb; |
| 196 | |
| 197 | cFYI(1, "In cifs_put_super"); |
| 198 | cifs_sb = CIFS_SB(sb); |
| 199 | if (cifs_sb == NULL) { |
| 200 | cFYI(1, "Empty cifs superblock info passed to unmount"); |
| 201 | return; |
| 202 | } |
| 203 | |
| 204 | lock_kernel(); |
| 205 | |
| 206 | rc = cifs_umount(sb, cifs_sb); |
| 207 | if (rc) |
| 208 | cERROR(1, "cifs_umount failed with return code %d", rc); |
| 209 | #ifdef CONFIG_CIFS_DFS_UPCALL |
| 210 | if (cifs_sb->mountdata) { |
| 211 | kfree(cifs_sb->mountdata); |
| 212 | cifs_sb->mountdata = NULL; |
| 213 | } |
| 214 | #endif |
| 215 | |
| 216 | unload_nls(cifs_sb->local_nls); |
| 217 | bdi_destroy(&cifs_sb->bdi); |
| 218 | kfree(cifs_sb); |
| 219 | |
| 220 | unlock_kernel(); |
| 221 | } |
| 222 | |
| 223 | static int |
| 224 | cifs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 225 | { |
| 226 | struct super_block *sb = dentry->d_sb; |
| 227 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| 228 | struct cifsTconInfo *tcon = cifs_sb->tcon; |
| 229 | int rc = -EOPNOTSUPP; |
| 230 | int xid; |
| 231 | |
| 232 | xid = GetXid(); |
| 233 | |
| 234 | buf->f_type = CIFS_MAGIC_NUMBER; |
| 235 | |
| 236 | /* |
| 237 | * PATH_MAX may be too long - it would presumably be total path, |
| 238 | * but note that some servers (includinng Samba 3) have a shorter |
| 239 | * maximum path. |
| 240 | * |
| 241 | * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO. |
| 242 | */ |
| 243 | buf->f_namelen = PATH_MAX; |
| 244 | buf->f_files = 0; /* undefined */ |
| 245 | buf->f_ffree = 0; /* unlimited */ |
| 246 | |
| 247 | /* |
| 248 | * We could add a second check for a QFS Unix capability bit |
| 249 | */ |
| 250 | if ((tcon->ses->capabilities & CAP_UNIX) && |
| 251 | (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability))) |
| 252 | rc = CIFSSMBQFSPosixInfo(xid, tcon, buf); |
| 253 | |
| 254 | /* |
| 255 | * Only need to call the old QFSInfo if failed on newer one, |
| 256 | * e.g. by OS/2. |
| 257 | **/ |
| 258 | if (rc && (tcon->ses->capabilities & CAP_NT_SMBS)) |
| 259 | rc = CIFSSMBQFSInfo(xid, tcon, buf); |
| 260 | |
| 261 | /* |
| 262 | * Some old Windows servers also do not support level 103, retry with |
| 263 | * older level one if old server failed the previous call or we |
| 264 | * bypassed it because we detected that this was an older LANMAN sess |
| 265 | */ |
| 266 | if (rc) |
| 267 | rc = SMBOldQFSInfo(xid, tcon, buf); |
| 268 | |
| 269 | FreeXid(xid); |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | static int cifs_permission(struct inode *inode, int mask) |
| 274 | { |
| 275 | struct cifs_sb_info *cifs_sb; |
| 276 | |
| 277 | cifs_sb = CIFS_SB(inode->i_sb); |
| 278 | |
| 279 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) { |
| 280 | if ((mask & MAY_EXEC) && !execute_ok(inode)) |
| 281 | return -EACCES; |
| 282 | else |
| 283 | return 0; |
| 284 | } else /* file mode might have been restricted at mount time |
| 285 | on the client (above and beyond ACL on servers) for |
| 286 | servers which do not support setting and viewing mode bits, |
| 287 | so allowing client to check permissions is useful */ |
| 288 | return generic_permission(inode, mask, NULL); |
| 289 | } |
| 290 | |
| 291 | static struct kmem_cache *cifs_inode_cachep; |
| 292 | static struct kmem_cache *cifs_req_cachep; |
| 293 | static struct kmem_cache *cifs_mid_cachep; |
| 294 | static struct kmem_cache *cifs_sm_req_cachep; |
| 295 | mempool_t *cifs_sm_req_poolp; |
| 296 | mempool_t *cifs_req_poolp; |
| 297 | mempool_t *cifs_mid_poolp; |
| 298 | |
| 299 | static struct inode * |
| 300 | cifs_alloc_inode(struct super_block *sb) |
| 301 | { |
| 302 | struct cifsInodeInfo *cifs_inode; |
| 303 | cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL); |
| 304 | if (!cifs_inode) |
| 305 | return NULL; |
| 306 | cifs_inode->cifsAttrs = 0x20; /* default */ |
| 307 | cifs_inode->time = 0; |
| 308 | cifs_inode->write_behind_rc = 0; |
| 309 | /* Until the file is open and we have gotten oplock |
| 310 | info back from the server, can not assume caching of |
| 311 | file data or metadata */ |
| 312 | cifs_inode->clientCanCacheRead = false; |
| 313 | cifs_inode->clientCanCacheAll = false; |
| 314 | cifs_inode->delete_pending = false; |
| 315 | cifs_inode->invalid_mapping = false; |
| 316 | cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */ |
| 317 | cifs_inode->server_eof = 0; |
| 318 | |
| 319 | /* Can not set i_flags here - they get immediately overwritten |
| 320 | to zero by the VFS */ |
| 321 | /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/ |
| 322 | INIT_LIST_HEAD(&cifs_inode->openFileList); |
| 323 | return &cifs_inode->vfs_inode; |
| 324 | } |
| 325 | |
| 326 | static void |
| 327 | cifs_destroy_inode(struct inode *inode) |
| 328 | { |
| 329 | kmem_cache_free(cifs_inode_cachep, CIFS_I(inode)); |
| 330 | } |
| 331 | |
| 332 | static void |
| 333 | cifs_clear_inode(struct inode *inode) |
| 334 | { |
| 335 | cifs_fscache_release_inode_cookie(inode); |
| 336 | } |
| 337 | |
| 338 | static void |
| 339 | cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server) |
| 340 | { |
| 341 | seq_printf(s, ",addr="); |
| 342 | |
| 343 | switch (server->addr.sockAddr.sin_family) { |
| 344 | case AF_INET: |
| 345 | seq_printf(s, "%pI4", &server->addr.sockAddr.sin_addr.s_addr); |
| 346 | break; |
| 347 | case AF_INET6: |
| 348 | seq_printf(s, "%pI6", |
| 349 | &server->addr.sockAddr6.sin6_addr.s6_addr); |
| 350 | if (server->addr.sockAddr6.sin6_scope_id) |
| 351 | seq_printf(s, "%%%u", |
| 352 | server->addr.sockAddr6.sin6_scope_id); |
| 353 | break; |
| 354 | default: |
| 355 | seq_printf(s, "(unknown)"); |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | /* |
| 360 | * cifs_show_options() is for displaying mount options in /proc/mounts. |
| 361 | * Not all settable options are displayed but most of the important |
| 362 | * ones are. |
| 363 | */ |
| 364 | static int |
| 365 | cifs_show_options(struct seq_file *s, struct vfsmount *m) |
| 366 | { |
| 367 | struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb); |
| 368 | struct cifsTconInfo *tcon = cifs_sb->tcon; |
| 369 | |
| 370 | seq_printf(s, ",unc=%s", tcon->treeName); |
| 371 | if (tcon->ses->userName) |
| 372 | seq_printf(s, ",username=%s", tcon->ses->userName); |
| 373 | if (tcon->ses->domainName) |
| 374 | seq_printf(s, ",domain=%s", tcon->ses->domainName); |
| 375 | |
| 376 | seq_printf(s, ",uid=%d", cifs_sb->mnt_uid); |
| 377 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) |
| 378 | seq_printf(s, ",forceuid"); |
| 379 | else |
| 380 | seq_printf(s, ",noforceuid"); |
| 381 | |
| 382 | seq_printf(s, ",gid=%d", cifs_sb->mnt_gid); |
| 383 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) |
| 384 | seq_printf(s, ",forcegid"); |
| 385 | else |
| 386 | seq_printf(s, ",noforcegid"); |
| 387 | |
| 388 | cifs_show_address(s, tcon->ses->server); |
| 389 | |
| 390 | if (!tcon->unix_ext) |
| 391 | seq_printf(s, ",file_mode=0%o,dir_mode=0%o", |
| 392 | cifs_sb->mnt_file_mode, |
| 393 | cifs_sb->mnt_dir_mode); |
| 394 | if (tcon->seal) |
| 395 | seq_printf(s, ",seal"); |
| 396 | if (tcon->nocase) |
| 397 | seq_printf(s, ",nocase"); |
| 398 | if (tcon->retry) |
| 399 | seq_printf(s, ",hard"); |
| 400 | if (cifs_sb->prepath) |
| 401 | seq_printf(s, ",prepath=%s", cifs_sb->prepath); |
| 402 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) |
| 403 | seq_printf(s, ",posixpaths"); |
| 404 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) |
| 405 | seq_printf(s, ",setuids"); |
| 406 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) |
| 407 | seq_printf(s, ",serverino"); |
| 408 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) |
| 409 | seq_printf(s, ",directio"); |
| 410 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
| 411 | seq_printf(s, ",nouser_xattr"); |
| 412 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) |
| 413 | seq_printf(s, ",mapchars"); |
| 414 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) |
| 415 | seq_printf(s, ",sfu"); |
| 416 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) |
| 417 | seq_printf(s, ",nobrl"); |
| 418 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) |
| 419 | seq_printf(s, ",cifsacl"); |
| 420 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) |
| 421 | seq_printf(s, ",dynperm"); |
| 422 | if (m->mnt_sb->s_flags & MS_POSIXACL) |
| 423 | seq_printf(s, ",acl"); |
| 424 | |
| 425 | seq_printf(s, ",rsize=%d", cifs_sb->rsize); |
| 426 | seq_printf(s, ",wsize=%d", cifs_sb->wsize); |
| 427 | |
| 428 | return 0; |
| 429 | } |
| 430 | |
| 431 | static void cifs_umount_begin(struct super_block *sb) |
| 432 | { |
| 433 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| 434 | struct cifsTconInfo *tcon; |
| 435 | |
| 436 | if (cifs_sb == NULL) |
| 437 | return; |
| 438 | |
| 439 | tcon = cifs_sb->tcon; |
| 440 | if (tcon == NULL) |
| 441 | return; |
| 442 | |
| 443 | read_lock(&cifs_tcp_ses_lock); |
| 444 | if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) { |
| 445 | /* we have other mounts to same share or we have |
| 446 | already tried to force umount this and woken up |
| 447 | all waiting network requests, nothing to do */ |
| 448 | read_unlock(&cifs_tcp_ses_lock); |
| 449 | return; |
| 450 | } else if (tcon->tc_count == 1) |
| 451 | tcon->tidStatus = CifsExiting; |
| 452 | read_unlock(&cifs_tcp_ses_lock); |
| 453 | |
| 454 | /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */ |
| 455 | /* cancel_notify_requests(tcon); */ |
| 456 | if (tcon->ses && tcon->ses->server) { |
| 457 | cFYI(1, "wake up tasks now - umount begin not complete"); |
| 458 | wake_up_all(&tcon->ses->server->request_q); |
| 459 | wake_up_all(&tcon->ses->server->response_q); |
| 460 | msleep(1); /* yield */ |
| 461 | /* we have to kick the requests once more */ |
| 462 | wake_up_all(&tcon->ses->server->response_q); |
| 463 | msleep(1); |
| 464 | } |
| 465 | |
| 466 | return; |
| 467 | } |
| 468 | |
| 469 | #ifdef CONFIG_CIFS_STATS2 |
| 470 | static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt) |
| 471 | { |
| 472 | /* BB FIXME */ |
| 473 | return 0; |
| 474 | } |
| 475 | #endif |
| 476 | |
| 477 | static int cifs_remount(struct super_block *sb, int *flags, char *data) |
| 478 | { |
| 479 | *flags |= MS_NODIRATIME; |
| 480 | return 0; |
| 481 | } |
| 482 | |
| 483 | static int cifs_drop_inode(struct inode *inode) |
| 484 | { |
| 485 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| 486 | |
| 487 | /* no serverino => unconditional eviction */ |
| 488 | return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) || |
| 489 | generic_drop_inode(inode); |
| 490 | } |
| 491 | |
| 492 | static const struct super_operations cifs_super_ops = { |
| 493 | .put_super = cifs_put_super, |
| 494 | .statfs = cifs_statfs, |
| 495 | .alloc_inode = cifs_alloc_inode, |
| 496 | .destroy_inode = cifs_destroy_inode, |
| 497 | .drop_inode = cifs_drop_inode, |
| 498 | .clear_inode = cifs_clear_inode, |
| 499 | /* .delete_inode = cifs_delete_inode, */ /* Do not need above |
| 500 | function unless later we add lazy close of inodes or unless the |
| 501 | kernel forgets to call us with the same number of releases (closes) |
| 502 | as opens */ |
| 503 | .show_options = cifs_show_options, |
| 504 | .umount_begin = cifs_umount_begin, |
| 505 | .remount_fs = cifs_remount, |
| 506 | #ifdef CONFIG_CIFS_STATS2 |
| 507 | .show_stats = cifs_show_stats, |
| 508 | #endif |
| 509 | }; |
| 510 | |
| 511 | static int |
| 512 | cifs_get_sb(struct file_system_type *fs_type, |
| 513 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
| 514 | { |
| 515 | int rc; |
| 516 | struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL); |
| 517 | |
| 518 | cFYI(1, "Devname: %s flags: %d ", dev_name, flags); |
| 519 | |
| 520 | if (IS_ERR(sb)) |
| 521 | return PTR_ERR(sb); |
| 522 | |
| 523 | sb->s_flags = flags; |
| 524 | |
| 525 | rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0); |
| 526 | if (rc) { |
| 527 | deactivate_locked_super(sb); |
| 528 | return rc; |
| 529 | } |
| 530 | sb->s_flags |= MS_ACTIVE; |
| 531 | simple_set_mnt(mnt, sb); |
| 532 | return 0; |
| 533 | } |
| 534 | |
| 535 | static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| 536 | unsigned long nr_segs, loff_t pos) |
| 537 | { |
| 538 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
| 539 | ssize_t written; |
| 540 | |
| 541 | written = generic_file_aio_write(iocb, iov, nr_segs, pos); |
| 542 | if (!CIFS_I(inode)->clientCanCacheAll) |
| 543 | filemap_fdatawrite(inode->i_mapping); |
| 544 | return written; |
| 545 | } |
| 546 | |
| 547 | static loff_t cifs_llseek(struct file *file, loff_t offset, int origin) |
| 548 | { |
| 549 | /* origin == SEEK_END => we must revalidate the cached file length */ |
| 550 | if (origin == SEEK_END) { |
| 551 | int retval; |
| 552 | |
| 553 | /* some applications poll for the file length in this strange |
| 554 | way so we must seek to end on non-oplocked files by |
| 555 | setting the revalidate time to zero */ |
| 556 | CIFS_I(file->f_path.dentry->d_inode)->time = 0; |
| 557 | |
| 558 | retval = cifs_revalidate_file(file); |
| 559 | if (retval < 0) |
| 560 | return (loff_t)retval; |
| 561 | } |
| 562 | return generic_file_llseek_unlocked(file, offset, origin); |
| 563 | } |
| 564 | |
| 565 | static int cifs_setlease(struct file *file, long arg, struct file_lock **lease) |
| 566 | { |
| 567 | /* note that this is called by vfs setlease with the BKL held |
| 568 | although I doubt that BKL is needed here in cifs */ |
| 569 | struct inode *inode = file->f_path.dentry->d_inode; |
| 570 | |
| 571 | if (!(S_ISREG(inode->i_mode))) |
| 572 | return -EINVAL; |
| 573 | |
| 574 | /* check if file is oplocked */ |
| 575 | if (((arg == F_RDLCK) && |
| 576 | (CIFS_I(inode)->clientCanCacheRead)) || |
| 577 | ((arg == F_WRLCK) && |
| 578 | (CIFS_I(inode)->clientCanCacheAll))) |
| 579 | return generic_setlease(file, arg, lease); |
| 580 | else if (CIFS_SB(inode->i_sb)->tcon->local_lease && |
| 581 | !CIFS_I(inode)->clientCanCacheRead) |
| 582 | /* If the server claims to support oplock on this |
| 583 | file, then we still need to check oplock even |
| 584 | if the local_lease mount option is set, but there |
| 585 | are servers which do not support oplock for which |
| 586 | this mount option may be useful if the user |
| 587 | knows that the file won't be changed on the server |
| 588 | by anyone else */ |
| 589 | return generic_setlease(file, arg, lease); |
| 590 | else |
| 591 | return -EAGAIN; |
| 592 | } |
| 593 | |
| 594 | struct file_system_type cifs_fs_type = { |
| 595 | .owner = THIS_MODULE, |
| 596 | .name = "cifs", |
| 597 | .get_sb = cifs_get_sb, |
| 598 | .kill_sb = kill_anon_super, |
| 599 | /* .fs_flags */ |
| 600 | }; |
| 601 | const struct inode_operations cifs_dir_inode_ops = { |
| 602 | .create = cifs_create, |
| 603 | .lookup = cifs_lookup, |
| 604 | .getattr = cifs_getattr, |
| 605 | .unlink = cifs_unlink, |
| 606 | .link = cifs_hardlink, |
| 607 | .mkdir = cifs_mkdir, |
| 608 | .rmdir = cifs_rmdir, |
| 609 | .rename = cifs_rename, |
| 610 | .permission = cifs_permission, |
| 611 | /* revalidate:cifs_revalidate, */ |
| 612 | .setattr = cifs_setattr, |
| 613 | .symlink = cifs_symlink, |
| 614 | .mknod = cifs_mknod, |
| 615 | #ifdef CONFIG_CIFS_XATTR |
| 616 | .setxattr = cifs_setxattr, |
| 617 | .getxattr = cifs_getxattr, |
| 618 | .listxattr = cifs_listxattr, |
| 619 | .removexattr = cifs_removexattr, |
| 620 | #endif |
| 621 | }; |
| 622 | |
| 623 | const struct inode_operations cifs_file_inode_ops = { |
| 624 | /* revalidate:cifs_revalidate, */ |
| 625 | .setattr = cifs_setattr, |
| 626 | .getattr = cifs_getattr, /* do we need this anymore? */ |
| 627 | .rename = cifs_rename, |
| 628 | .permission = cifs_permission, |
| 629 | #ifdef CONFIG_CIFS_XATTR |
| 630 | .setxattr = cifs_setxattr, |
| 631 | .getxattr = cifs_getxattr, |
| 632 | .listxattr = cifs_listxattr, |
| 633 | .removexattr = cifs_removexattr, |
| 634 | #endif |
| 635 | }; |
| 636 | |
| 637 | const struct inode_operations cifs_symlink_inode_ops = { |
| 638 | .readlink = generic_readlink, |
| 639 | .follow_link = cifs_follow_link, |
| 640 | .put_link = cifs_put_link, |
| 641 | .permission = cifs_permission, |
| 642 | /* BB add the following two eventually */ |
| 643 | /* revalidate: cifs_revalidate, |
| 644 | setattr: cifs_notify_change, *//* BB do we need notify change */ |
| 645 | #ifdef CONFIG_CIFS_XATTR |
| 646 | .setxattr = cifs_setxattr, |
| 647 | .getxattr = cifs_getxattr, |
| 648 | .listxattr = cifs_listxattr, |
| 649 | .removexattr = cifs_removexattr, |
| 650 | #endif |
| 651 | }; |
| 652 | |
| 653 | const struct file_operations cifs_file_ops = { |
| 654 | .read = do_sync_read, |
| 655 | .write = do_sync_write, |
| 656 | .aio_read = generic_file_aio_read, |
| 657 | .aio_write = cifs_file_aio_write, |
| 658 | .open = cifs_open, |
| 659 | .release = cifs_close, |
| 660 | .lock = cifs_lock, |
| 661 | .fsync = cifs_fsync, |
| 662 | .flush = cifs_flush, |
| 663 | .mmap = cifs_file_mmap, |
| 664 | .splice_read = generic_file_splice_read, |
| 665 | .llseek = cifs_llseek, |
| 666 | #ifdef CONFIG_CIFS_POSIX |
| 667 | .unlocked_ioctl = cifs_ioctl, |
| 668 | #endif /* CONFIG_CIFS_POSIX */ |
| 669 | .setlease = cifs_setlease, |
| 670 | }; |
| 671 | |
| 672 | const struct file_operations cifs_file_direct_ops = { |
| 673 | /* no aio, no readv - |
| 674 | BB reevaluate whether they can be done with directio, no cache */ |
| 675 | .read = cifs_user_read, |
| 676 | .write = cifs_user_write, |
| 677 | .open = cifs_open, |
| 678 | .release = cifs_close, |
| 679 | .lock = cifs_lock, |
| 680 | .fsync = cifs_fsync, |
| 681 | .flush = cifs_flush, |
| 682 | .mmap = cifs_file_mmap, |
| 683 | .splice_read = generic_file_splice_read, |
| 684 | #ifdef CONFIG_CIFS_POSIX |
| 685 | .unlocked_ioctl = cifs_ioctl, |
| 686 | #endif /* CONFIG_CIFS_POSIX */ |
| 687 | .llseek = cifs_llseek, |
| 688 | .setlease = cifs_setlease, |
| 689 | }; |
| 690 | const struct file_operations cifs_file_nobrl_ops = { |
| 691 | .read = do_sync_read, |
| 692 | .write = do_sync_write, |
| 693 | .aio_read = generic_file_aio_read, |
| 694 | .aio_write = cifs_file_aio_write, |
| 695 | .open = cifs_open, |
| 696 | .release = cifs_close, |
| 697 | .fsync = cifs_fsync, |
| 698 | .flush = cifs_flush, |
| 699 | .mmap = cifs_file_mmap, |
| 700 | .splice_read = generic_file_splice_read, |
| 701 | .llseek = cifs_llseek, |
| 702 | #ifdef CONFIG_CIFS_POSIX |
| 703 | .unlocked_ioctl = cifs_ioctl, |
| 704 | #endif /* CONFIG_CIFS_POSIX */ |
| 705 | .setlease = cifs_setlease, |
| 706 | }; |
| 707 | |
| 708 | const struct file_operations cifs_file_direct_nobrl_ops = { |
| 709 | /* no mmap, no aio, no readv - |
| 710 | BB reevaluate whether they can be done with directio, no cache */ |
| 711 | .read = cifs_user_read, |
| 712 | .write = cifs_user_write, |
| 713 | .open = cifs_open, |
| 714 | .release = cifs_close, |
| 715 | .fsync = cifs_fsync, |
| 716 | .flush = cifs_flush, |
| 717 | .mmap = cifs_file_mmap, |
| 718 | .splice_read = generic_file_splice_read, |
| 719 | #ifdef CONFIG_CIFS_POSIX |
| 720 | .unlocked_ioctl = cifs_ioctl, |
| 721 | #endif /* CONFIG_CIFS_POSIX */ |
| 722 | .llseek = cifs_llseek, |
| 723 | .setlease = cifs_setlease, |
| 724 | }; |
| 725 | |
| 726 | const struct file_operations cifs_dir_ops = { |
| 727 | .readdir = cifs_readdir, |
| 728 | .release = cifs_closedir, |
| 729 | .read = generic_read_dir, |
| 730 | .unlocked_ioctl = cifs_ioctl, |
| 731 | .llseek = generic_file_llseek, |
| 732 | }; |
| 733 | |
| 734 | static void |
| 735 | cifs_init_once(void *inode) |
| 736 | { |
| 737 | struct cifsInodeInfo *cifsi = inode; |
| 738 | |
| 739 | inode_init_once(&cifsi->vfs_inode); |
| 740 | INIT_LIST_HEAD(&cifsi->lockList); |
| 741 | } |
| 742 | |
| 743 | static int |
| 744 | cifs_init_inodecache(void) |
| 745 | { |
| 746 | cifs_inode_cachep = kmem_cache_create("cifs_inode_cache", |
| 747 | sizeof(struct cifsInodeInfo), |
| 748 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 749 | SLAB_MEM_SPREAD), |
| 750 | cifs_init_once); |
| 751 | if (cifs_inode_cachep == NULL) |
| 752 | return -ENOMEM; |
| 753 | |
| 754 | return 0; |
| 755 | } |
| 756 | |
| 757 | static void |
| 758 | cifs_destroy_inodecache(void) |
| 759 | { |
| 760 | kmem_cache_destroy(cifs_inode_cachep); |
| 761 | } |
| 762 | |
| 763 | static int |
| 764 | cifs_init_request_bufs(void) |
| 765 | { |
| 766 | if (CIFSMaxBufSize < 8192) { |
| 767 | /* Buffer size can not be smaller than 2 * PATH_MAX since maximum |
| 768 | Unicode path name has to fit in any SMB/CIFS path based frames */ |
| 769 | CIFSMaxBufSize = 8192; |
| 770 | } else if (CIFSMaxBufSize > 1024*127) { |
| 771 | CIFSMaxBufSize = 1024 * 127; |
| 772 | } else { |
| 773 | CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/ |
| 774 | } |
| 775 | /* cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */ |
| 776 | cifs_req_cachep = kmem_cache_create("cifs_request", |
| 777 | CIFSMaxBufSize + |
| 778 | MAX_CIFS_HDR_SIZE, 0, |
| 779 | SLAB_HWCACHE_ALIGN, NULL); |
| 780 | if (cifs_req_cachep == NULL) |
| 781 | return -ENOMEM; |
| 782 | |
| 783 | if (cifs_min_rcv < 1) |
| 784 | cifs_min_rcv = 1; |
| 785 | else if (cifs_min_rcv > 64) { |
| 786 | cifs_min_rcv = 64; |
| 787 | cERROR(1, "cifs_min_rcv set to maximum (64)"); |
| 788 | } |
| 789 | |
| 790 | cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv, |
| 791 | cifs_req_cachep); |
| 792 | |
| 793 | if (cifs_req_poolp == NULL) { |
| 794 | kmem_cache_destroy(cifs_req_cachep); |
| 795 | return -ENOMEM; |
| 796 | } |
| 797 | /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and |
| 798 | almost all handle based requests (but not write response, nor is it |
| 799 | sufficient for path based requests). A smaller size would have |
| 800 | been more efficient (compacting multiple slab items on one 4k page) |
| 801 | for the case in which debug was on, but this larger size allows |
| 802 | more SMBs to use small buffer alloc and is still much more |
| 803 | efficient to alloc 1 per page off the slab compared to 17K (5page) |
| 804 | alloc of large cifs buffers even when page debugging is on */ |
| 805 | cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq", |
| 806 | MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN, |
| 807 | NULL); |
| 808 | if (cifs_sm_req_cachep == NULL) { |
| 809 | mempool_destroy(cifs_req_poolp); |
| 810 | kmem_cache_destroy(cifs_req_cachep); |
| 811 | return -ENOMEM; |
| 812 | } |
| 813 | |
| 814 | if (cifs_min_small < 2) |
| 815 | cifs_min_small = 2; |
| 816 | else if (cifs_min_small > 256) { |
| 817 | cifs_min_small = 256; |
| 818 | cFYI(1, "cifs_min_small set to maximum (256)"); |
| 819 | } |
| 820 | |
| 821 | cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small, |
| 822 | cifs_sm_req_cachep); |
| 823 | |
| 824 | if (cifs_sm_req_poolp == NULL) { |
| 825 | mempool_destroy(cifs_req_poolp); |
| 826 | kmem_cache_destroy(cifs_req_cachep); |
| 827 | kmem_cache_destroy(cifs_sm_req_cachep); |
| 828 | return -ENOMEM; |
| 829 | } |
| 830 | |
| 831 | return 0; |
| 832 | } |
| 833 | |
| 834 | static void |
| 835 | cifs_destroy_request_bufs(void) |
| 836 | { |
| 837 | mempool_destroy(cifs_req_poolp); |
| 838 | kmem_cache_destroy(cifs_req_cachep); |
| 839 | mempool_destroy(cifs_sm_req_poolp); |
| 840 | kmem_cache_destroy(cifs_sm_req_cachep); |
| 841 | } |
| 842 | |
| 843 | static int |
| 844 | cifs_init_mids(void) |
| 845 | { |
| 846 | cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids", |
| 847 | sizeof(struct mid_q_entry), 0, |
| 848 | SLAB_HWCACHE_ALIGN, NULL); |
| 849 | if (cifs_mid_cachep == NULL) |
| 850 | return -ENOMEM; |
| 851 | |
| 852 | /* 3 is a reasonable minimum number of simultaneous operations */ |
| 853 | cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep); |
| 854 | if (cifs_mid_poolp == NULL) { |
| 855 | kmem_cache_destroy(cifs_mid_cachep); |
| 856 | return -ENOMEM; |
| 857 | } |
| 858 | |
| 859 | return 0; |
| 860 | } |
| 861 | |
| 862 | static void |
| 863 | cifs_destroy_mids(void) |
| 864 | { |
| 865 | mempool_destroy(cifs_mid_poolp); |
| 866 | kmem_cache_destroy(cifs_mid_cachep); |
| 867 | } |
| 868 | |
| 869 | static int __init |
| 870 | init_cifs(void) |
| 871 | { |
| 872 | int rc = 0; |
| 873 | cifs_proc_init(); |
| 874 | INIT_LIST_HEAD(&cifs_tcp_ses_list); |
| 875 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
| 876 | INIT_LIST_HEAD(&GlobalDnotifyReqList); |
| 877 | INIT_LIST_HEAD(&GlobalDnotifyRsp_Q); |
| 878 | #endif |
| 879 | /* |
| 880 | * Initialize Global counters |
| 881 | */ |
| 882 | atomic_set(&sesInfoAllocCount, 0); |
| 883 | atomic_set(&tconInfoAllocCount, 0); |
| 884 | atomic_set(&tcpSesAllocCount, 0); |
| 885 | atomic_set(&tcpSesReconnectCount, 0); |
| 886 | atomic_set(&tconInfoReconnectCount, 0); |
| 887 | |
| 888 | atomic_set(&bufAllocCount, 0); |
| 889 | atomic_set(&smBufAllocCount, 0); |
| 890 | #ifdef CONFIG_CIFS_STATS2 |
| 891 | atomic_set(&totBufAllocCount, 0); |
| 892 | atomic_set(&totSmBufAllocCount, 0); |
| 893 | #endif /* CONFIG_CIFS_STATS2 */ |
| 894 | |
| 895 | atomic_set(&midCount, 0); |
| 896 | GlobalCurrentXid = 0; |
| 897 | GlobalTotalActiveXid = 0; |
| 898 | GlobalMaxActiveXid = 0; |
| 899 | memset(Local_System_Name, 0, 15); |
| 900 | rwlock_init(&GlobalSMBSeslock); |
| 901 | rwlock_init(&cifs_tcp_ses_lock); |
| 902 | spin_lock_init(&GlobalMid_Lock); |
| 903 | |
| 904 | if (cifs_max_pending < 2) { |
| 905 | cifs_max_pending = 2; |
| 906 | cFYI(1, "cifs_max_pending set to min of 2"); |
| 907 | } else if (cifs_max_pending > 256) { |
| 908 | cifs_max_pending = 256; |
| 909 | cFYI(1, "cifs_max_pending set to max of 256"); |
| 910 | } |
| 911 | |
| 912 | rc = cifs_fscache_register(); |
| 913 | if (rc) |
| 914 | goto out; |
| 915 | |
| 916 | rc = cifs_init_inodecache(); |
| 917 | if (rc) |
| 918 | goto out_clean_proc; |
| 919 | |
| 920 | rc = cifs_init_mids(); |
| 921 | if (rc) |
| 922 | goto out_destroy_inodecache; |
| 923 | |
| 924 | rc = cifs_init_request_bufs(); |
| 925 | if (rc) |
| 926 | goto out_destroy_mids; |
| 927 | |
| 928 | rc = register_filesystem(&cifs_fs_type); |
| 929 | if (rc) |
| 930 | goto out_destroy_request_bufs; |
| 931 | #ifdef CONFIG_CIFS_UPCALL |
| 932 | rc = register_key_type(&cifs_spnego_key_type); |
| 933 | if (rc) |
| 934 | goto out_unregister_filesystem; |
| 935 | #endif |
| 936 | #ifdef CONFIG_CIFS_DFS_UPCALL |
| 937 | rc = cifs_init_dns_resolver(); |
| 938 | if (rc) |
| 939 | goto out_unregister_key_type; |
| 940 | #endif |
| 941 | rc = slow_work_register_user(THIS_MODULE); |
| 942 | if (rc) |
| 943 | goto out_unregister_resolver_key; |
| 944 | |
| 945 | return 0; |
| 946 | |
| 947 | out_unregister_resolver_key: |
| 948 | #ifdef CONFIG_CIFS_DFS_UPCALL |
| 949 | cifs_exit_dns_resolver(); |
| 950 | out_unregister_key_type: |
| 951 | #endif |
| 952 | #ifdef CONFIG_CIFS_UPCALL |
| 953 | unregister_key_type(&cifs_spnego_key_type); |
| 954 | out_unregister_filesystem: |
| 955 | #endif |
| 956 | unregister_filesystem(&cifs_fs_type); |
| 957 | out_destroy_request_bufs: |
| 958 | cifs_destroy_request_bufs(); |
| 959 | out_destroy_mids: |
| 960 | cifs_destroy_mids(); |
| 961 | out_destroy_inodecache: |
| 962 | cifs_destroy_inodecache(); |
| 963 | out_clean_proc: |
| 964 | cifs_proc_clean(); |
| 965 | cifs_fscache_unregister(); |
| 966 | out: |
| 967 | return rc; |
| 968 | } |
| 969 | |
| 970 | static void __exit |
| 971 | exit_cifs(void) |
| 972 | { |
| 973 | cFYI(DBG2, "exit_cifs"); |
| 974 | cifs_proc_clean(); |
| 975 | cifs_fscache_unregister(); |
| 976 | #ifdef CONFIG_CIFS_DFS_UPCALL |
| 977 | cifs_dfs_release_automount_timer(); |
| 978 | cifs_exit_dns_resolver(); |
| 979 | #endif |
| 980 | #ifdef CONFIG_CIFS_UPCALL |
| 981 | unregister_key_type(&cifs_spnego_key_type); |
| 982 | #endif |
| 983 | unregister_filesystem(&cifs_fs_type); |
| 984 | cifs_destroy_inodecache(); |
| 985 | cifs_destroy_mids(); |
| 986 | cifs_destroy_request_bufs(); |
| 987 | } |
| 988 | |
| 989 | MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>"); |
| 990 | MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */ |
| 991 | MODULE_DESCRIPTION |
| 992 | ("VFS to access servers complying with the SNIA CIFS Specification " |
| 993 | "e.g. Samba and Windows"); |
| 994 | MODULE_VERSION(CIFS_VERSION); |
| 995 | module_init(init_cifs) |
| 996 | module_exit(exit_cifs) |