| 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/namei.h> |
| 39 | #include <net/ipv6.h> |
| 40 | #include "cifsfs.h" |
| 41 | #include "cifspdu.h" |
| 42 | #define DECLARE_GLOBALS_HERE |
| 43 | #include "cifsglob.h" |
| 44 | #include "cifsproto.h" |
| 45 | #include "cifs_debug.h" |
| 46 | #include "cifs_fs_sb.h" |
| 47 | #include <linux/mm.h> |
| 48 | #include <linux/key-type.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 linuxExtEnabled = 1; |
| 58 | unsigned int lookupCacheEnabled = 1; |
| 59 | unsigned int multiuser_mount = 0; |
| 60 | unsigned int global_secflags = CIFSSEC_DEF; |
| 61 | /* unsigned int ntlmv2_support = 0; */ |
| 62 | unsigned int sign_CIFS_PDUs = 1; |
| 63 | static const struct super_operations cifs_super_ops; |
| 64 | unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE; |
| 65 | module_param(CIFSMaxBufSize, int, 0); |
| 66 | MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). " |
| 67 | "Default: 16384 Range: 8192 to 130048"); |
| 68 | unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL; |
| 69 | module_param(cifs_min_rcv, int, 0); |
| 70 | MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: " |
| 71 | "1 to 64"); |
| 72 | unsigned int cifs_min_small = 30; |
| 73 | module_param(cifs_min_small, int, 0); |
| 74 | MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 " |
| 75 | "Range: 2 to 256"); |
| 76 | unsigned int cifs_max_pending = CIFS_MAX_REQ; |
| 77 | module_param(cifs_max_pending, int, 0); |
| 78 | MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. " |
| 79 | "Default: 50 Range: 2 to 256"); |
| 80 | unsigned short echo_retries = 5; |
| 81 | module_param(echo_retries, ushort, 0644); |
| 82 | MODULE_PARM_DESC(echo_retries, "Number of echo attempts before giving up and " |
| 83 | "reconnecting server. Default: 5. 0 means " |
| 84 | "never reconnect."); |
| 85 | extern mempool_t *cifs_sm_req_poolp; |
| 86 | extern mempool_t *cifs_req_poolp; |
| 87 | extern mempool_t *cifs_mid_poolp; |
| 88 | |
| 89 | static int |
| 90 | cifs_read_super(struct super_block *sb) |
| 91 | { |
| 92 | struct inode *inode; |
| 93 | struct cifs_sb_info *cifs_sb; |
| 94 | int rc = 0; |
| 95 | |
| 96 | cifs_sb = CIFS_SB(sb); |
| 97 | |
| 98 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL) |
| 99 | sb->s_flags |= MS_POSIXACL; |
| 100 | |
| 101 | if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & CAP_LARGE_FILES) |
| 102 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
| 103 | else |
| 104 | sb->s_maxbytes = MAX_NON_LFS; |
| 105 | |
| 106 | /* BB FIXME fix time_gran to be larger for LANMAN sessions */ |
| 107 | sb->s_time_gran = 100; |
| 108 | |
| 109 | sb->s_magic = CIFS_MAGIC_NUMBER; |
| 110 | sb->s_op = &cifs_super_ops; |
| 111 | sb->s_bdi = &cifs_sb->bdi; |
| 112 | sb->s_blocksize = CIFS_MAX_MSGSIZE; |
| 113 | sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */ |
| 114 | inode = cifs_root_iget(sb); |
| 115 | |
| 116 | if (IS_ERR(inode)) { |
| 117 | rc = PTR_ERR(inode); |
| 118 | inode = NULL; |
| 119 | goto out_no_root; |
| 120 | } |
| 121 | |
| 122 | sb->s_root = d_alloc_root(inode); |
| 123 | |
| 124 | if (!sb->s_root) { |
| 125 | rc = -ENOMEM; |
| 126 | goto out_no_root; |
| 127 | } |
| 128 | |
| 129 | /* do that *after* d_alloc_root() - we want NULL ->d_op for root here */ |
| 130 | if (cifs_sb_master_tcon(cifs_sb)->nocase) |
| 131 | sb->s_d_op = &cifs_ci_dentry_ops; |
| 132 | else |
| 133 | sb->s_d_op = &cifs_dentry_ops; |
| 134 | |
| 135 | #ifdef CIFS_NFSD_EXPORT |
| 136 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { |
| 137 | cFYI(1, "export ops supported"); |
| 138 | sb->s_export_op = &cifs_export_ops; |
| 139 | } |
| 140 | #endif /* CIFS_NFSD_EXPORT */ |
| 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 | return rc; |
| 150 | } |
| 151 | |
| 152 | static void cifs_kill_sb(struct super_block *sb) |
| 153 | { |
| 154 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| 155 | kill_anon_super(sb); |
| 156 | cifs_umount(cifs_sb); |
| 157 | } |
| 158 | |
| 159 | static int |
| 160 | cifs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 161 | { |
| 162 | struct super_block *sb = dentry->d_sb; |
| 163 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| 164 | struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
| 165 | int rc = -EOPNOTSUPP; |
| 166 | int xid; |
| 167 | |
| 168 | xid = GetXid(); |
| 169 | |
| 170 | buf->f_type = CIFS_MAGIC_NUMBER; |
| 171 | |
| 172 | /* |
| 173 | * PATH_MAX may be too long - it would presumably be total path, |
| 174 | * but note that some servers (includinng Samba 3) have a shorter |
| 175 | * maximum path. |
| 176 | * |
| 177 | * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO. |
| 178 | */ |
| 179 | buf->f_namelen = PATH_MAX; |
| 180 | buf->f_files = 0; /* undefined */ |
| 181 | buf->f_ffree = 0; /* unlimited */ |
| 182 | |
| 183 | /* |
| 184 | * We could add a second check for a QFS Unix capability bit |
| 185 | */ |
| 186 | if ((tcon->ses->capabilities & CAP_UNIX) && |
| 187 | (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability))) |
| 188 | rc = CIFSSMBQFSPosixInfo(xid, tcon, buf); |
| 189 | |
| 190 | /* |
| 191 | * Only need to call the old QFSInfo if failed on newer one, |
| 192 | * e.g. by OS/2. |
| 193 | **/ |
| 194 | if (rc && (tcon->ses->capabilities & CAP_NT_SMBS)) |
| 195 | rc = CIFSSMBQFSInfo(xid, tcon, buf); |
| 196 | |
| 197 | /* |
| 198 | * Some old Windows servers also do not support level 103, retry with |
| 199 | * older level one if old server failed the previous call or we |
| 200 | * bypassed it because we detected that this was an older LANMAN sess |
| 201 | */ |
| 202 | if (rc) |
| 203 | rc = SMBOldQFSInfo(xid, tcon, buf); |
| 204 | |
| 205 | FreeXid(xid); |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | static int cifs_permission(struct inode *inode, int mask) |
| 210 | { |
| 211 | struct cifs_sb_info *cifs_sb; |
| 212 | |
| 213 | cifs_sb = CIFS_SB(inode->i_sb); |
| 214 | |
| 215 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) { |
| 216 | if ((mask & MAY_EXEC) && !execute_ok(inode)) |
| 217 | return -EACCES; |
| 218 | else |
| 219 | return 0; |
| 220 | } else /* file mode might have been restricted at mount time |
| 221 | on the client (above and beyond ACL on servers) for |
| 222 | servers which do not support setting and viewing mode bits, |
| 223 | so allowing client to check permissions is useful */ |
| 224 | return generic_permission(inode, mask); |
| 225 | } |
| 226 | |
| 227 | static struct kmem_cache *cifs_inode_cachep; |
| 228 | static struct kmem_cache *cifs_req_cachep; |
| 229 | static struct kmem_cache *cifs_mid_cachep; |
| 230 | static struct kmem_cache *cifs_sm_req_cachep; |
| 231 | mempool_t *cifs_sm_req_poolp; |
| 232 | mempool_t *cifs_req_poolp; |
| 233 | mempool_t *cifs_mid_poolp; |
| 234 | |
| 235 | static struct inode * |
| 236 | cifs_alloc_inode(struct super_block *sb) |
| 237 | { |
| 238 | struct cifsInodeInfo *cifs_inode; |
| 239 | cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL); |
| 240 | if (!cifs_inode) |
| 241 | return NULL; |
| 242 | cifs_inode->cifsAttrs = 0x20; /* default */ |
| 243 | cifs_inode->time = 0; |
| 244 | /* Until the file is open and we have gotten oplock |
| 245 | info back from the server, can not assume caching of |
| 246 | file data or metadata */ |
| 247 | cifs_set_oplock_level(cifs_inode, 0); |
| 248 | cifs_inode->delete_pending = false; |
| 249 | cifs_inode->invalid_mapping = false; |
| 250 | cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */ |
| 251 | cifs_inode->server_eof = 0; |
| 252 | cifs_inode->uniqueid = 0; |
| 253 | cifs_inode->createtime = 0; |
| 254 | |
| 255 | /* Can not set i_flags here - they get immediately overwritten |
| 256 | to zero by the VFS */ |
| 257 | /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/ |
| 258 | INIT_LIST_HEAD(&cifs_inode->openFileList); |
| 259 | return &cifs_inode->vfs_inode; |
| 260 | } |
| 261 | |
| 262 | static void cifs_i_callback(struct rcu_head *head) |
| 263 | { |
| 264 | struct inode *inode = container_of(head, struct inode, i_rcu); |
| 265 | INIT_LIST_HEAD(&inode->i_dentry); |
| 266 | kmem_cache_free(cifs_inode_cachep, CIFS_I(inode)); |
| 267 | } |
| 268 | |
| 269 | static void |
| 270 | cifs_destroy_inode(struct inode *inode) |
| 271 | { |
| 272 | call_rcu(&inode->i_rcu, cifs_i_callback); |
| 273 | } |
| 274 | |
| 275 | static void |
| 276 | cifs_evict_inode(struct inode *inode) |
| 277 | { |
| 278 | truncate_inode_pages(&inode->i_data, 0); |
| 279 | end_writeback(inode); |
| 280 | cifs_fscache_release_inode_cookie(inode); |
| 281 | } |
| 282 | |
| 283 | static void |
| 284 | cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server) |
| 285 | { |
| 286 | struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr; |
| 287 | struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr; |
| 288 | |
| 289 | seq_printf(s, ",addr="); |
| 290 | |
| 291 | switch (server->dstaddr.ss_family) { |
| 292 | case AF_INET: |
| 293 | seq_printf(s, "%pI4", &sa->sin_addr.s_addr); |
| 294 | break; |
| 295 | case AF_INET6: |
| 296 | seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr); |
| 297 | if (sa6->sin6_scope_id) |
| 298 | seq_printf(s, "%%%u", sa6->sin6_scope_id); |
| 299 | break; |
| 300 | default: |
| 301 | seq_printf(s, "(unknown)"); |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | static void |
| 306 | cifs_show_security(struct seq_file *s, struct TCP_Server_Info *server) |
| 307 | { |
| 308 | seq_printf(s, ",sec="); |
| 309 | |
| 310 | switch (server->secType) { |
| 311 | case LANMAN: |
| 312 | seq_printf(s, "lanman"); |
| 313 | break; |
| 314 | case NTLMv2: |
| 315 | seq_printf(s, "ntlmv2"); |
| 316 | break; |
| 317 | case NTLM: |
| 318 | seq_printf(s, "ntlm"); |
| 319 | break; |
| 320 | case Kerberos: |
| 321 | seq_printf(s, "krb5"); |
| 322 | break; |
| 323 | case RawNTLMSSP: |
| 324 | seq_printf(s, "ntlmssp"); |
| 325 | break; |
| 326 | default: |
| 327 | /* shouldn't ever happen */ |
| 328 | seq_printf(s, "unknown"); |
| 329 | break; |
| 330 | } |
| 331 | |
| 332 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
| 333 | seq_printf(s, "i"); |
| 334 | } |
| 335 | |
| 336 | /* |
| 337 | * cifs_show_options() is for displaying mount options in /proc/mounts. |
| 338 | * Not all settable options are displayed but most of the important |
| 339 | * ones are. |
| 340 | */ |
| 341 | static int |
| 342 | cifs_show_options(struct seq_file *s, struct vfsmount *m) |
| 343 | { |
| 344 | struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb); |
| 345 | struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
| 346 | struct sockaddr *srcaddr; |
| 347 | srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr; |
| 348 | |
| 349 | cifs_show_security(s, tcon->ses->server); |
| 350 | |
| 351 | seq_printf(s, ",unc=%s", tcon->treeName); |
| 352 | |
| 353 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) |
| 354 | seq_printf(s, ",multiuser"); |
| 355 | else if (tcon->ses->user_name) |
| 356 | seq_printf(s, ",username=%s", tcon->ses->user_name); |
| 357 | |
| 358 | if (tcon->ses->domainName) |
| 359 | seq_printf(s, ",domain=%s", tcon->ses->domainName); |
| 360 | |
| 361 | if (srcaddr->sa_family != AF_UNSPEC) { |
| 362 | struct sockaddr_in *saddr4; |
| 363 | struct sockaddr_in6 *saddr6; |
| 364 | saddr4 = (struct sockaddr_in *)srcaddr; |
| 365 | saddr6 = (struct sockaddr_in6 *)srcaddr; |
| 366 | if (srcaddr->sa_family == AF_INET6) |
| 367 | seq_printf(s, ",srcaddr=%pI6c", |
| 368 | &saddr6->sin6_addr); |
| 369 | else if (srcaddr->sa_family == AF_INET) |
| 370 | seq_printf(s, ",srcaddr=%pI4", |
| 371 | &saddr4->sin_addr.s_addr); |
| 372 | else |
| 373 | seq_printf(s, ",srcaddr=BAD-AF:%i", |
| 374 | (int)(srcaddr->sa_family)); |
| 375 | } |
| 376 | |
| 377 | seq_printf(s, ",uid=%d", cifs_sb->mnt_uid); |
| 378 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) |
| 379 | seq_printf(s, ",forceuid"); |
| 380 | else |
| 381 | seq_printf(s, ",noforceuid"); |
| 382 | |
| 383 | seq_printf(s, ",gid=%d", cifs_sb->mnt_gid); |
| 384 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) |
| 385 | seq_printf(s, ",forcegid"); |
| 386 | else |
| 387 | seq_printf(s, ",noforcegid"); |
| 388 | |
| 389 | cifs_show_address(s, tcon->ses->server); |
| 390 | |
| 391 | if (!tcon->unix_ext) |
| 392 | seq_printf(s, ",file_mode=0%o,dir_mode=0%o", |
| 393 | cifs_sb->mnt_file_mode, |
| 394 | cifs_sb->mnt_dir_mode); |
| 395 | if (tcon->seal) |
| 396 | seq_printf(s, ",seal"); |
| 397 | if (tcon->nocase) |
| 398 | seq_printf(s, ",nocase"); |
| 399 | if (tcon->retry) |
| 400 | seq_printf(s, ",hard"); |
| 401 | if (tcon->unix_ext) |
| 402 | seq_printf(s, ",unix"); |
| 403 | else |
| 404 | seq_printf(s, ",nounix"); |
| 405 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) |
| 406 | seq_printf(s, ",posixpaths"); |
| 407 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) |
| 408 | seq_printf(s, ",setuids"); |
| 409 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) |
| 410 | seq_printf(s, ",serverino"); |
| 411 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
| 412 | seq_printf(s, ",rwpidforward"); |
| 413 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) |
| 414 | seq_printf(s, ",forcemand"); |
| 415 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) |
| 416 | seq_printf(s, ",directio"); |
| 417 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
| 418 | seq_printf(s, ",nouser_xattr"); |
| 419 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) |
| 420 | seq_printf(s, ",mapchars"); |
| 421 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) |
| 422 | seq_printf(s, ",sfu"); |
| 423 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) |
| 424 | seq_printf(s, ",nobrl"); |
| 425 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) |
| 426 | seq_printf(s, ",cifsacl"); |
| 427 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) |
| 428 | seq_printf(s, ",dynperm"); |
| 429 | if (m->mnt_sb->s_flags & MS_POSIXACL) |
| 430 | seq_printf(s, ",acl"); |
| 431 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) |
| 432 | seq_printf(s, ",mfsymlinks"); |
| 433 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE) |
| 434 | seq_printf(s, ",fsc"); |
| 435 | |
| 436 | seq_printf(s, ",rsize=%d", cifs_sb->rsize); |
| 437 | seq_printf(s, ",wsize=%d", cifs_sb->wsize); |
| 438 | /* convert actimeo and display it in seconds */ |
| 439 | seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ); |
| 440 | |
| 441 | return 0; |
| 442 | } |
| 443 | |
| 444 | static void cifs_umount_begin(struct super_block *sb) |
| 445 | { |
| 446 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| 447 | struct cifs_tcon *tcon; |
| 448 | |
| 449 | if (cifs_sb == NULL) |
| 450 | return; |
| 451 | |
| 452 | tcon = cifs_sb_master_tcon(cifs_sb); |
| 453 | |
| 454 | spin_lock(&cifs_tcp_ses_lock); |
| 455 | if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) { |
| 456 | /* we have other mounts to same share or we have |
| 457 | already tried to force umount this and woken up |
| 458 | all waiting network requests, nothing to do */ |
| 459 | spin_unlock(&cifs_tcp_ses_lock); |
| 460 | return; |
| 461 | } else if (tcon->tc_count == 1) |
| 462 | tcon->tidStatus = CifsExiting; |
| 463 | spin_unlock(&cifs_tcp_ses_lock); |
| 464 | |
| 465 | /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */ |
| 466 | /* cancel_notify_requests(tcon); */ |
| 467 | if (tcon->ses && tcon->ses->server) { |
| 468 | cFYI(1, "wake up tasks now - umount begin not complete"); |
| 469 | wake_up_all(&tcon->ses->server->request_q); |
| 470 | wake_up_all(&tcon->ses->server->response_q); |
| 471 | msleep(1); /* yield */ |
| 472 | /* we have to kick the requests once more */ |
| 473 | wake_up_all(&tcon->ses->server->response_q); |
| 474 | msleep(1); |
| 475 | } |
| 476 | |
| 477 | return; |
| 478 | } |
| 479 | |
| 480 | #ifdef CONFIG_CIFS_STATS2 |
| 481 | static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt) |
| 482 | { |
| 483 | /* BB FIXME */ |
| 484 | return 0; |
| 485 | } |
| 486 | #endif |
| 487 | |
| 488 | static int cifs_remount(struct super_block *sb, int *flags, char *data) |
| 489 | { |
| 490 | *flags |= MS_NODIRATIME; |
| 491 | return 0; |
| 492 | } |
| 493 | |
| 494 | static int cifs_drop_inode(struct inode *inode) |
| 495 | { |
| 496 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| 497 | |
| 498 | /* no serverino => unconditional eviction */ |
| 499 | return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) || |
| 500 | generic_drop_inode(inode); |
| 501 | } |
| 502 | |
| 503 | static const struct super_operations cifs_super_ops = { |
| 504 | .statfs = cifs_statfs, |
| 505 | .alloc_inode = cifs_alloc_inode, |
| 506 | .destroy_inode = cifs_destroy_inode, |
| 507 | .drop_inode = cifs_drop_inode, |
| 508 | .evict_inode = cifs_evict_inode, |
| 509 | /* .delete_inode = cifs_delete_inode, */ /* Do not need above |
| 510 | function unless later we add lazy close of inodes or unless the |
| 511 | kernel forgets to call us with the same number of releases (closes) |
| 512 | as opens */ |
| 513 | .show_options = cifs_show_options, |
| 514 | .umount_begin = cifs_umount_begin, |
| 515 | .remount_fs = cifs_remount, |
| 516 | #ifdef CONFIG_CIFS_STATS2 |
| 517 | .show_stats = cifs_show_stats, |
| 518 | #endif |
| 519 | }; |
| 520 | |
| 521 | /* |
| 522 | * Get root dentry from superblock according to prefix path mount option. |
| 523 | * Return dentry with refcount + 1 on success and NULL otherwise. |
| 524 | */ |
| 525 | static struct dentry * |
| 526 | cifs_get_root(struct smb_vol *vol, struct super_block *sb) |
| 527 | { |
| 528 | struct dentry *dentry; |
| 529 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| 530 | char *full_path = NULL; |
| 531 | char *s, *p; |
| 532 | char sep; |
| 533 | int xid; |
| 534 | |
| 535 | full_path = cifs_build_path_to_root(vol, cifs_sb, |
| 536 | cifs_sb_master_tcon(cifs_sb)); |
| 537 | if (full_path == NULL) |
| 538 | return ERR_PTR(-ENOMEM); |
| 539 | |
| 540 | cFYI(1, "Get root dentry for %s", full_path); |
| 541 | |
| 542 | xid = GetXid(); |
| 543 | sep = CIFS_DIR_SEP(cifs_sb); |
| 544 | dentry = dget(sb->s_root); |
| 545 | p = s = full_path; |
| 546 | |
| 547 | do { |
| 548 | struct inode *dir = dentry->d_inode; |
| 549 | struct dentry *child; |
| 550 | |
| 551 | if (!dir) { |
| 552 | dput(dentry); |
| 553 | dentry = ERR_PTR(-ENOENT); |
| 554 | break; |
| 555 | } |
| 556 | |
| 557 | /* skip separators */ |
| 558 | while (*s == sep) |
| 559 | s++; |
| 560 | if (!*s) |
| 561 | break; |
| 562 | p = s++; |
| 563 | /* next separator */ |
| 564 | while (*s && *s != sep) |
| 565 | s++; |
| 566 | |
| 567 | mutex_lock(&dir->i_mutex); |
| 568 | child = lookup_one_len(p, dentry, s - p); |
| 569 | mutex_unlock(&dir->i_mutex); |
| 570 | dput(dentry); |
| 571 | dentry = child; |
| 572 | } while (!IS_ERR(dentry)); |
| 573 | _FreeXid(xid); |
| 574 | kfree(full_path); |
| 575 | return dentry; |
| 576 | } |
| 577 | |
| 578 | static int cifs_set_super(struct super_block *sb, void *data) |
| 579 | { |
| 580 | struct cifs_mnt_data *mnt_data = data; |
| 581 | sb->s_fs_info = mnt_data->cifs_sb; |
| 582 | return set_anon_super(sb, NULL); |
| 583 | } |
| 584 | |
| 585 | static struct dentry * |
| 586 | cifs_do_mount(struct file_system_type *fs_type, |
| 587 | int flags, const char *dev_name, void *data) |
| 588 | { |
| 589 | int rc; |
| 590 | struct super_block *sb; |
| 591 | struct cifs_sb_info *cifs_sb; |
| 592 | struct smb_vol *volume_info; |
| 593 | struct cifs_mnt_data mnt_data; |
| 594 | struct dentry *root; |
| 595 | |
| 596 | cFYI(1, "Devname: %s flags: %d ", dev_name, flags); |
| 597 | |
| 598 | volume_info = cifs_get_volume_info((char *)data, dev_name); |
| 599 | if (IS_ERR(volume_info)) |
| 600 | return ERR_CAST(volume_info); |
| 601 | |
| 602 | cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL); |
| 603 | if (cifs_sb == NULL) { |
| 604 | root = ERR_PTR(-ENOMEM); |
| 605 | goto out_nls; |
| 606 | } |
| 607 | |
| 608 | cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL); |
| 609 | if (cifs_sb->mountdata == NULL) { |
| 610 | root = ERR_PTR(-ENOMEM); |
| 611 | goto out_cifs_sb; |
| 612 | } |
| 613 | |
| 614 | cifs_setup_cifs_sb(volume_info, cifs_sb); |
| 615 | |
| 616 | rc = cifs_mount(cifs_sb, volume_info); |
| 617 | if (rc) { |
| 618 | if (!(flags & MS_SILENT)) |
| 619 | cERROR(1, "cifs_mount failed w/return code = %d", rc); |
| 620 | root = ERR_PTR(rc); |
| 621 | goto out_mountdata; |
| 622 | } |
| 623 | |
| 624 | mnt_data.vol = volume_info; |
| 625 | mnt_data.cifs_sb = cifs_sb; |
| 626 | mnt_data.flags = flags; |
| 627 | |
| 628 | sb = sget(fs_type, cifs_match_super, cifs_set_super, &mnt_data); |
| 629 | if (IS_ERR(sb)) { |
| 630 | root = ERR_CAST(sb); |
| 631 | cifs_umount(cifs_sb); |
| 632 | goto out; |
| 633 | } |
| 634 | |
| 635 | if (sb->s_root) { |
| 636 | cFYI(1, "Use existing superblock"); |
| 637 | cifs_umount(cifs_sb); |
| 638 | } else { |
| 639 | sb->s_flags = flags; |
| 640 | /* BB should we make this contingent on mount parm? */ |
| 641 | sb->s_flags |= MS_NODIRATIME | MS_NOATIME; |
| 642 | |
| 643 | rc = cifs_read_super(sb); |
| 644 | if (rc) { |
| 645 | root = ERR_PTR(rc); |
| 646 | goto out_super; |
| 647 | } |
| 648 | |
| 649 | sb->s_flags |= MS_ACTIVE; |
| 650 | } |
| 651 | |
| 652 | root = cifs_get_root(volume_info, sb); |
| 653 | if (IS_ERR(root)) |
| 654 | goto out_super; |
| 655 | |
| 656 | cFYI(1, "dentry root is: %p", root); |
| 657 | goto out; |
| 658 | |
| 659 | out_super: |
| 660 | deactivate_locked_super(sb); |
| 661 | out: |
| 662 | cifs_cleanup_volume_info(volume_info); |
| 663 | return root; |
| 664 | |
| 665 | out_mountdata: |
| 666 | kfree(cifs_sb->mountdata); |
| 667 | out_cifs_sb: |
| 668 | kfree(cifs_sb); |
| 669 | out_nls: |
| 670 | unload_nls(volume_info->local_nls); |
| 671 | goto out; |
| 672 | } |
| 673 | |
| 674 | static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| 675 | unsigned long nr_segs, loff_t pos) |
| 676 | { |
| 677 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
| 678 | ssize_t written; |
| 679 | int rc; |
| 680 | |
| 681 | written = generic_file_aio_write(iocb, iov, nr_segs, pos); |
| 682 | |
| 683 | if (CIFS_I(inode)->clientCanCacheAll) |
| 684 | return written; |
| 685 | |
| 686 | rc = filemap_fdatawrite(inode->i_mapping); |
| 687 | if (rc) |
| 688 | cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode); |
| 689 | |
| 690 | return written; |
| 691 | } |
| 692 | |
| 693 | static loff_t cifs_llseek(struct file *file, loff_t offset, int origin) |
| 694 | { |
| 695 | /* |
| 696 | * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate |
| 697 | * the cached file length |
| 698 | */ |
| 699 | if (origin != SEEK_SET || origin != SEEK_CUR) { |
| 700 | int rc; |
| 701 | struct inode *inode = file->f_path.dentry->d_inode; |
| 702 | |
| 703 | /* |
| 704 | * We need to be sure that all dirty pages are written and the |
| 705 | * server has the newest file length. |
| 706 | */ |
| 707 | if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping && |
| 708 | inode->i_mapping->nrpages != 0) { |
| 709 | rc = filemap_fdatawait(inode->i_mapping); |
| 710 | if (rc) { |
| 711 | mapping_set_error(inode->i_mapping, rc); |
| 712 | return rc; |
| 713 | } |
| 714 | } |
| 715 | /* |
| 716 | * Some applications poll for the file length in this strange |
| 717 | * way so we must seek to end on non-oplocked files by |
| 718 | * setting the revalidate time to zero. |
| 719 | */ |
| 720 | CIFS_I(inode)->time = 0; |
| 721 | |
| 722 | rc = cifs_revalidate_file_attr(file); |
| 723 | if (rc < 0) |
| 724 | return (loff_t)rc; |
| 725 | } |
| 726 | return generic_file_llseek_unlocked(file, offset, origin); |
| 727 | } |
| 728 | |
| 729 | static int cifs_setlease(struct file *file, long arg, struct file_lock **lease) |
| 730 | { |
| 731 | /* note that this is called by vfs setlease with lock_flocks held |
| 732 | to protect *lease from going away */ |
| 733 | struct inode *inode = file->f_path.dentry->d_inode; |
| 734 | struct cifsFileInfo *cfile = file->private_data; |
| 735 | |
| 736 | if (!(S_ISREG(inode->i_mode))) |
| 737 | return -EINVAL; |
| 738 | |
| 739 | /* check if file is oplocked */ |
| 740 | if (((arg == F_RDLCK) && |
| 741 | (CIFS_I(inode)->clientCanCacheRead)) || |
| 742 | ((arg == F_WRLCK) && |
| 743 | (CIFS_I(inode)->clientCanCacheAll))) |
| 744 | return generic_setlease(file, arg, lease); |
| 745 | else if (tlink_tcon(cfile->tlink)->local_lease && |
| 746 | !CIFS_I(inode)->clientCanCacheRead) |
| 747 | /* If the server claims to support oplock on this |
| 748 | file, then we still need to check oplock even |
| 749 | if the local_lease mount option is set, but there |
| 750 | are servers which do not support oplock for which |
| 751 | this mount option may be useful if the user |
| 752 | knows that the file won't be changed on the server |
| 753 | by anyone else */ |
| 754 | return generic_setlease(file, arg, lease); |
| 755 | else |
| 756 | return -EAGAIN; |
| 757 | } |
| 758 | |
| 759 | struct file_system_type cifs_fs_type = { |
| 760 | .owner = THIS_MODULE, |
| 761 | .name = "cifs", |
| 762 | .mount = cifs_do_mount, |
| 763 | .kill_sb = cifs_kill_sb, |
| 764 | /* .fs_flags */ |
| 765 | }; |
| 766 | const struct inode_operations cifs_dir_inode_ops = { |
| 767 | .create = cifs_create, |
| 768 | .lookup = cifs_lookup, |
| 769 | .getattr = cifs_getattr, |
| 770 | .unlink = cifs_unlink, |
| 771 | .link = cifs_hardlink, |
| 772 | .mkdir = cifs_mkdir, |
| 773 | .rmdir = cifs_rmdir, |
| 774 | .rename = cifs_rename, |
| 775 | .permission = cifs_permission, |
| 776 | /* revalidate:cifs_revalidate, */ |
| 777 | .setattr = cifs_setattr, |
| 778 | .symlink = cifs_symlink, |
| 779 | .mknod = cifs_mknod, |
| 780 | #ifdef CONFIG_CIFS_XATTR |
| 781 | .setxattr = cifs_setxattr, |
| 782 | .getxattr = cifs_getxattr, |
| 783 | .listxattr = cifs_listxattr, |
| 784 | .removexattr = cifs_removexattr, |
| 785 | #endif |
| 786 | }; |
| 787 | |
| 788 | const struct inode_operations cifs_file_inode_ops = { |
| 789 | /* revalidate:cifs_revalidate, */ |
| 790 | .setattr = cifs_setattr, |
| 791 | .getattr = cifs_getattr, /* do we need this anymore? */ |
| 792 | .rename = cifs_rename, |
| 793 | .permission = cifs_permission, |
| 794 | #ifdef CONFIG_CIFS_XATTR |
| 795 | .setxattr = cifs_setxattr, |
| 796 | .getxattr = cifs_getxattr, |
| 797 | .listxattr = cifs_listxattr, |
| 798 | .removexattr = cifs_removexattr, |
| 799 | #endif |
| 800 | }; |
| 801 | |
| 802 | const struct inode_operations cifs_symlink_inode_ops = { |
| 803 | .readlink = generic_readlink, |
| 804 | .follow_link = cifs_follow_link, |
| 805 | .put_link = cifs_put_link, |
| 806 | .permission = cifs_permission, |
| 807 | /* BB add the following two eventually */ |
| 808 | /* revalidate: cifs_revalidate, |
| 809 | setattr: cifs_notify_change, *//* BB do we need notify change */ |
| 810 | #ifdef CONFIG_CIFS_XATTR |
| 811 | .setxattr = cifs_setxattr, |
| 812 | .getxattr = cifs_getxattr, |
| 813 | .listxattr = cifs_listxattr, |
| 814 | .removexattr = cifs_removexattr, |
| 815 | #endif |
| 816 | }; |
| 817 | |
| 818 | const struct file_operations cifs_file_ops = { |
| 819 | .read = do_sync_read, |
| 820 | .write = do_sync_write, |
| 821 | .aio_read = generic_file_aio_read, |
| 822 | .aio_write = cifs_file_aio_write, |
| 823 | .open = cifs_open, |
| 824 | .release = cifs_close, |
| 825 | .lock = cifs_lock, |
| 826 | .fsync = cifs_fsync, |
| 827 | .flush = cifs_flush, |
| 828 | .mmap = cifs_file_mmap, |
| 829 | .splice_read = generic_file_splice_read, |
| 830 | .llseek = cifs_llseek, |
| 831 | #ifdef CONFIG_CIFS_POSIX |
| 832 | .unlocked_ioctl = cifs_ioctl, |
| 833 | #endif /* CONFIG_CIFS_POSIX */ |
| 834 | .setlease = cifs_setlease, |
| 835 | }; |
| 836 | |
| 837 | const struct file_operations cifs_file_strict_ops = { |
| 838 | .read = do_sync_read, |
| 839 | .write = do_sync_write, |
| 840 | .aio_read = cifs_strict_readv, |
| 841 | .aio_write = cifs_strict_writev, |
| 842 | .open = cifs_open, |
| 843 | .release = cifs_close, |
| 844 | .lock = cifs_lock, |
| 845 | .fsync = cifs_strict_fsync, |
| 846 | .flush = cifs_flush, |
| 847 | .mmap = cifs_file_strict_mmap, |
| 848 | .splice_read = generic_file_splice_read, |
| 849 | .llseek = cifs_llseek, |
| 850 | #ifdef CONFIG_CIFS_POSIX |
| 851 | .unlocked_ioctl = cifs_ioctl, |
| 852 | #endif /* CONFIG_CIFS_POSIX */ |
| 853 | .setlease = cifs_setlease, |
| 854 | }; |
| 855 | |
| 856 | const struct file_operations cifs_file_direct_ops = { |
| 857 | /* BB reevaluate whether they can be done with directio, no cache */ |
| 858 | .read = do_sync_read, |
| 859 | .write = do_sync_write, |
| 860 | .aio_read = cifs_user_readv, |
| 861 | .aio_write = cifs_user_writev, |
| 862 | .open = cifs_open, |
| 863 | .release = cifs_close, |
| 864 | .lock = cifs_lock, |
| 865 | .fsync = cifs_fsync, |
| 866 | .flush = cifs_flush, |
| 867 | .mmap = cifs_file_mmap, |
| 868 | .splice_read = generic_file_splice_read, |
| 869 | #ifdef CONFIG_CIFS_POSIX |
| 870 | .unlocked_ioctl = cifs_ioctl, |
| 871 | #endif /* CONFIG_CIFS_POSIX */ |
| 872 | .llseek = cifs_llseek, |
| 873 | .setlease = cifs_setlease, |
| 874 | }; |
| 875 | |
| 876 | const struct file_operations cifs_file_nobrl_ops = { |
| 877 | .read = do_sync_read, |
| 878 | .write = do_sync_write, |
| 879 | .aio_read = generic_file_aio_read, |
| 880 | .aio_write = cifs_file_aio_write, |
| 881 | .open = cifs_open, |
| 882 | .release = cifs_close, |
| 883 | .fsync = cifs_fsync, |
| 884 | .flush = cifs_flush, |
| 885 | .mmap = cifs_file_mmap, |
| 886 | .splice_read = generic_file_splice_read, |
| 887 | .llseek = cifs_llseek, |
| 888 | #ifdef CONFIG_CIFS_POSIX |
| 889 | .unlocked_ioctl = cifs_ioctl, |
| 890 | #endif /* CONFIG_CIFS_POSIX */ |
| 891 | .setlease = cifs_setlease, |
| 892 | }; |
| 893 | |
| 894 | const struct file_operations cifs_file_strict_nobrl_ops = { |
| 895 | .read = do_sync_read, |
| 896 | .write = do_sync_write, |
| 897 | .aio_read = cifs_strict_readv, |
| 898 | .aio_write = cifs_strict_writev, |
| 899 | .open = cifs_open, |
| 900 | .release = cifs_close, |
| 901 | .fsync = cifs_strict_fsync, |
| 902 | .flush = cifs_flush, |
| 903 | .mmap = cifs_file_strict_mmap, |
| 904 | .splice_read = generic_file_splice_read, |
| 905 | .llseek = cifs_llseek, |
| 906 | #ifdef CONFIG_CIFS_POSIX |
| 907 | .unlocked_ioctl = cifs_ioctl, |
| 908 | #endif /* CONFIG_CIFS_POSIX */ |
| 909 | .setlease = cifs_setlease, |
| 910 | }; |
| 911 | |
| 912 | const struct file_operations cifs_file_direct_nobrl_ops = { |
| 913 | /* BB reevaluate whether they can be done with directio, no cache */ |
| 914 | .read = do_sync_read, |
| 915 | .write = do_sync_write, |
| 916 | .aio_read = cifs_user_readv, |
| 917 | .aio_write = cifs_user_writev, |
| 918 | .open = cifs_open, |
| 919 | .release = cifs_close, |
| 920 | .fsync = cifs_fsync, |
| 921 | .flush = cifs_flush, |
| 922 | .mmap = cifs_file_mmap, |
| 923 | .splice_read = generic_file_splice_read, |
| 924 | #ifdef CONFIG_CIFS_POSIX |
| 925 | .unlocked_ioctl = cifs_ioctl, |
| 926 | #endif /* CONFIG_CIFS_POSIX */ |
| 927 | .llseek = cifs_llseek, |
| 928 | .setlease = cifs_setlease, |
| 929 | }; |
| 930 | |
| 931 | const struct file_operations cifs_dir_ops = { |
| 932 | .readdir = cifs_readdir, |
| 933 | .release = cifs_closedir, |
| 934 | .read = generic_read_dir, |
| 935 | .unlocked_ioctl = cifs_ioctl, |
| 936 | .llseek = generic_file_llseek, |
| 937 | }; |
| 938 | |
| 939 | static void |
| 940 | cifs_init_once(void *inode) |
| 941 | { |
| 942 | struct cifsInodeInfo *cifsi = inode; |
| 943 | |
| 944 | inode_init_once(&cifsi->vfs_inode); |
| 945 | INIT_LIST_HEAD(&cifsi->lockList); |
| 946 | } |
| 947 | |
| 948 | static int |
| 949 | cifs_init_inodecache(void) |
| 950 | { |
| 951 | cifs_inode_cachep = kmem_cache_create("cifs_inode_cache", |
| 952 | sizeof(struct cifsInodeInfo), |
| 953 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 954 | SLAB_MEM_SPREAD), |
| 955 | cifs_init_once); |
| 956 | if (cifs_inode_cachep == NULL) |
| 957 | return -ENOMEM; |
| 958 | |
| 959 | return 0; |
| 960 | } |
| 961 | |
| 962 | static void |
| 963 | cifs_destroy_inodecache(void) |
| 964 | { |
| 965 | kmem_cache_destroy(cifs_inode_cachep); |
| 966 | } |
| 967 | |
| 968 | static int |
| 969 | cifs_init_request_bufs(void) |
| 970 | { |
| 971 | if (CIFSMaxBufSize < 8192) { |
| 972 | /* Buffer size can not be smaller than 2 * PATH_MAX since maximum |
| 973 | Unicode path name has to fit in any SMB/CIFS path based frames */ |
| 974 | CIFSMaxBufSize = 8192; |
| 975 | } else if (CIFSMaxBufSize > 1024*127) { |
| 976 | CIFSMaxBufSize = 1024 * 127; |
| 977 | } else { |
| 978 | CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/ |
| 979 | } |
| 980 | /* cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */ |
| 981 | cifs_req_cachep = kmem_cache_create("cifs_request", |
| 982 | CIFSMaxBufSize + |
| 983 | MAX_CIFS_HDR_SIZE, 0, |
| 984 | SLAB_HWCACHE_ALIGN, NULL); |
| 985 | if (cifs_req_cachep == NULL) |
| 986 | return -ENOMEM; |
| 987 | |
| 988 | if (cifs_min_rcv < 1) |
| 989 | cifs_min_rcv = 1; |
| 990 | else if (cifs_min_rcv > 64) { |
| 991 | cifs_min_rcv = 64; |
| 992 | cERROR(1, "cifs_min_rcv set to maximum (64)"); |
| 993 | } |
| 994 | |
| 995 | cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv, |
| 996 | cifs_req_cachep); |
| 997 | |
| 998 | if (cifs_req_poolp == NULL) { |
| 999 | kmem_cache_destroy(cifs_req_cachep); |
| 1000 | return -ENOMEM; |
| 1001 | } |
| 1002 | /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and |
| 1003 | almost all handle based requests (but not write response, nor is it |
| 1004 | sufficient for path based requests). A smaller size would have |
| 1005 | been more efficient (compacting multiple slab items on one 4k page) |
| 1006 | for the case in which debug was on, but this larger size allows |
| 1007 | more SMBs to use small buffer alloc and is still much more |
| 1008 | efficient to alloc 1 per page off the slab compared to 17K (5page) |
| 1009 | alloc of large cifs buffers even when page debugging is on */ |
| 1010 | cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq", |
| 1011 | MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN, |
| 1012 | NULL); |
| 1013 | if (cifs_sm_req_cachep == NULL) { |
| 1014 | mempool_destroy(cifs_req_poolp); |
| 1015 | kmem_cache_destroy(cifs_req_cachep); |
| 1016 | return -ENOMEM; |
| 1017 | } |
| 1018 | |
| 1019 | if (cifs_min_small < 2) |
| 1020 | cifs_min_small = 2; |
| 1021 | else if (cifs_min_small > 256) { |
| 1022 | cifs_min_small = 256; |
| 1023 | cFYI(1, "cifs_min_small set to maximum (256)"); |
| 1024 | } |
| 1025 | |
| 1026 | cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small, |
| 1027 | cifs_sm_req_cachep); |
| 1028 | |
| 1029 | if (cifs_sm_req_poolp == NULL) { |
| 1030 | mempool_destroy(cifs_req_poolp); |
| 1031 | kmem_cache_destroy(cifs_req_cachep); |
| 1032 | kmem_cache_destroy(cifs_sm_req_cachep); |
| 1033 | return -ENOMEM; |
| 1034 | } |
| 1035 | |
| 1036 | return 0; |
| 1037 | } |
| 1038 | |
| 1039 | static void |
| 1040 | cifs_destroy_request_bufs(void) |
| 1041 | { |
| 1042 | mempool_destroy(cifs_req_poolp); |
| 1043 | kmem_cache_destroy(cifs_req_cachep); |
| 1044 | mempool_destroy(cifs_sm_req_poolp); |
| 1045 | kmem_cache_destroy(cifs_sm_req_cachep); |
| 1046 | } |
| 1047 | |
| 1048 | static int |
| 1049 | cifs_init_mids(void) |
| 1050 | { |
| 1051 | cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids", |
| 1052 | sizeof(struct mid_q_entry), 0, |
| 1053 | SLAB_HWCACHE_ALIGN, NULL); |
| 1054 | if (cifs_mid_cachep == NULL) |
| 1055 | return -ENOMEM; |
| 1056 | |
| 1057 | /* 3 is a reasonable minimum number of simultaneous operations */ |
| 1058 | cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep); |
| 1059 | if (cifs_mid_poolp == NULL) { |
| 1060 | kmem_cache_destroy(cifs_mid_cachep); |
| 1061 | return -ENOMEM; |
| 1062 | } |
| 1063 | |
| 1064 | return 0; |
| 1065 | } |
| 1066 | |
| 1067 | static void |
| 1068 | cifs_destroy_mids(void) |
| 1069 | { |
| 1070 | mempool_destroy(cifs_mid_poolp); |
| 1071 | kmem_cache_destroy(cifs_mid_cachep); |
| 1072 | } |
| 1073 | |
| 1074 | static int __init |
| 1075 | init_cifs(void) |
| 1076 | { |
| 1077 | int rc = 0; |
| 1078 | cifs_proc_init(); |
| 1079 | INIT_LIST_HEAD(&cifs_tcp_ses_list); |
| 1080 | #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */ |
| 1081 | INIT_LIST_HEAD(&GlobalDnotifyReqList); |
| 1082 | INIT_LIST_HEAD(&GlobalDnotifyRsp_Q); |
| 1083 | #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */ |
| 1084 | /* |
| 1085 | * Initialize Global counters |
| 1086 | */ |
| 1087 | atomic_set(&sesInfoAllocCount, 0); |
| 1088 | atomic_set(&tconInfoAllocCount, 0); |
| 1089 | atomic_set(&tcpSesAllocCount, 0); |
| 1090 | atomic_set(&tcpSesReconnectCount, 0); |
| 1091 | atomic_set(&tconInfoReconnectCount, 0); |
| 1092 | |
| 1093 | atomic_set(&bufAllocCount, 0); |
| 1094 | atomic_set(&smBufAllocCount, 0); |
| 1095 | #ifdef CONFIG_CIFS_STATS2 |
| 1096 | atomic_set(&totBufAllocCount, 0); |
| 1097 | atomic_set(&totSmBufAllocCount, 0); |
| 1098 | #endif /* CONFIG_CIFS_STATS2 */ |
| 1099 | |
| 1100 | atomic_set(&midCount, 0); |
| 1101 | GlobalCurrentXid = 0; |
| 1102 | GlobalTotalActiveXid = 0; |
| 1103 | GlobalMaxActiveXid = 0; |
| 1104 | spin_lock_init(&cifs_tcp_ses_lock); |
| 1105 | spin_lock_init(&cifs_file_list_lock); |
| 1106 | spin_lock_init(&GlobalMid_Lock); |
| 1107 | |
| 1108 | if (cifs_max_pending < 2) { |
| 1109 | cifs_max_pending = 2; |
| 1110 | cFYI(1, "cifs_max_pending set to min of 2"); |
| 1111 | } else if (cifs_max_pending > 256) { |
| 1112 | cifs_max_pending = 256; |
| 1113 | cFYI(1, "cifs_max_pending set to max of 256"); |
| 1114 | } |
| 1115 | |
| 1116 | rc = cifs_fscache_register(); |
| 1117 | if (rc) |
| 1118 | goto out_clean_proc; |
| 1119 | |
| 1120 | rc = cifs_init_inodecache(); |
| 1121 | if (rc) |
| 1122 | goto out_unreg_fscache; |
| 1123 | |
| 1124 | rc = cifs_init_mids(); |
| 1125 | if (rc) |
| 1126 | goto out_destroy_inodecache; |
| 1127 | |
| 1128 | rc = cifs_init_request_bufs(); |
| 1129 | if (rc) |
| 1130 | goto out_destroy_mids; |
| 1131 | |
| 1132 | #ifdef CONFIG_CIFS_UPCALL |
| 1133 | rc = register_key_type(&cifs_spnego_key_type); |
| 1134 | if (rc) |
| 1135 | goto out_destroy_request_bufs; |
| 1136 | #endif /* CONFIG_CIFS_UPCALL */ |
| 1137 | |
| 1138 | #ifdef CONFIG_CIFS_ACL |
| 1139 | rc = init_cifs_idmap(); |
| 1140 | if (rc) |
| 1141 | goto out_register_key_type; |
| 1142 | #endif /* CONFIG_CIFS_ACL */ |
| 1143 | |
| 1144 | rc = register_filesystem(&cifs_fs_type); |
| 1145 | if (rc) |
| 1146 | goto out_init_cifs_idmap; |
| 1147 | |
| 1148 | return 0; |
| 1149 | |
| 1150 | out_init_cifs_idmap: |
| 1151 | #ifdef CONFIG_CIFS_ACL |
| 1152 | exit_cifs_idmap(); |
| 1153 | out_register_key_type: |
| 1154 | #endif |
| 1155 | #ifdef CONFIG_CIFS_UPCALL |
| 1156 | unregister_key_type(&cifs_spnego_key_type); |
| 1157 | out_destroy_request_bufs: |
| 1158 | #endif |
| 1159 | cifs_destroy_request_bufs(); |
| 1160 | out_destroy_mids: |
| 1161 | cifs_destroy_mids(); |
| 1162 | out_destroy_inodecache: |
| 1163 | cifs_destroy_inodecache(); |
| 1164 | out_unreg_fscache: |
| 1165 | cifs_fscache_unregister(); |
| 1166 | out_clean_proc: |
| 1167 | cifs_proc_clean(); |
| 1168 | return rc; |
| 1169 | } |
| 1170 | |
| 1171 | static void __exit |
| 1172 | exit_cifs(void) |
| 1173 | { |
| 1174 | cFYI(DBG2, "exit_cifs"); |
| 1175 | cifs_proc_clean(); |
| 1176 | cifs_fscache_unregister(); |
| 1177 | #ifdef CONFIG_CIFS_DFS_UPCALL |
| 1178 | cifs_dfs_release_automount_timer(); |
| 1179 | #endif |
| 1180 | #ifdef CONFIG_CIFS_ACL |
| 1181 | cifs_destroy_idmaptrees(); |
| 1182 | exit_cifs_idmap(); |
| 1183 | #endif |
| 1184 | #ifdef CONFIG_CIFS_UPCALL |
| 1185 | unregister_key_type(&cifs_spnego_key_type); |
| 1186 | #endif |
| 1187 | unregister_filesystem(&cifs_fs_type); |
| 1188 | cifs_destroy_inodecache(); |
| 1189 | cifs_destroy_mids(); |
| 1190 | cifs_destroy_request_bufs(); |
| 1191 | } |
| 1192 | |
| 1193 | MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>"); |
| 1194 | MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */ |
| 1195 | MODULE_DESCRIPTION |
| 1196 | ("VFS to access servers complying with the SNIA CIFS Specification " |
| 1197 | "e.g. Samba and Windows"); |
| 1198 | MODULE_VERSION(CIFS_VERSION); |
| 1199 | module_init(init_cifs) |
| 1200 | module_exit(exit_cifs) |