Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 3 | * |
| 4 | * dlmfs.c |
| 5 | * |
| 6 | * Code which implements the kernel side of a minimal userspace |
| 7 | * interface to our DLM. This file handles the virtual file system |
| 8 | * used for communication with userspace. Credit should go to ramfs, |
| 9 | * which was a template for the fs side of this module. |
| 10 | * |
| 11 | * Copyright (C) 2003, 2004 Oracle. All rights reserved. |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU General Public |
| 15 | * License as published by the Free Software Foundation; either |
| 16 | * version 2 of the License, or (at your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 21 | * General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public |
| 24 | * License along with this program; if not, write to the |
| 25 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 26 | * Boston, MA 021110-1307, USA. |
| 27 | */ |
| 28 | |
| 29 | /* Simple VFS hooks based on: */ |
| 30 | /* |
| 31 | * Resizable simple ram filesystem for Linux. |
| 32 | * |
| 33 | * Copyright (C) 2000 Linus Torvalds. |
| 34 | * 2000 Transmeta Corp. |
| 35 | */ |
| 36 | |
| 37 | #include <linux/module.h> |
| 38 | #include <linux/fs.h> |
| 39 | #include <linux/pagemap.h> |
| 40 | #include <linux/types.h> |
| 41 | #include <linux/slab.h> |
| 42 | #include <linux/highmem.h> |
| 43 | #include <linux/init.h> |
| 44 | #include <linux/string.h> |
| 45 | #include <linux/smp_lock.h> |
| 46 | #include <linux/backing-dev.h> |
| 47 | |
| 48 | #include <asm/uaccess.h> |
| 49 | |
| 50 | |
| 51 | #include "cluster/nodemanager.h" |
| 52 | #include "cluster/heartbeat.h" |
| 53 | #include "cluster/tcp.h" |
| 54 | |
| 55 | #include "dlmapi.h" |
| 56 | |
| 57 | #include "userdlm.h" |
| 58 | |
| 59 | #include "dlmfsver.h" |
| 60 | |
| 61 | #define MLOG_MASK_PREFIX ML_DLMFS |
| 62 | #include "cluster/masklog.h" |
| 63 | |
| 64 | static struct super_operations dlmfs_ops; |
| 65 | static struct file_operations dlmfs_file_operations; |
| 66 | static struct inode_operations dlmfs_dir_inode_operations; |
| 67 | static struct inode_operations dlmfs_root_inode_operations; |
| 68 | static struct inode_operations dlmfs_file_inode_operations; |
| 69 | static kmem_cache_t *dlmfs_inode_cache; |
| 70 | |
| 71 | struct workqueue_struct *user_dlm_worker; |
| 72 | |
| 73 | /* |
| 74 | * decodes a set of open flags into a valid lock level and a set of flags. |
| 75 | * returns < 0 if we have invalid flags |
| 76 | * flags which mean something to us: |
| 77 | * O_RDONLY -> PRMODE level |
| 78 | * O_WRONLY -> EXMODE level |
| 79 | * |
| 80 | * O_NONBLOCK -> LKM_NOQUEUE |
| 81 | */ |
| 82 | static int dlmfs_decode_open_flags(int open_flags, |
| 83 | int *level, |
| 84 | int *flags) |
| 85 | { |
| 86 | if (open_flags & (O_WRONLY|O_RDWR)) |
| 87 | *level = LKM_EXMODE; |
| 88 | else |
| 89 | *level = LKM_PRMODE; |
| 90 | |
| 91 | *flags = 0; |
| 92 | if (open_flags & O_NONBLOCK) |
| 93 | *flags |= LKM_NOQUEUE; |
| 94 | |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | static int dlmfs_file_open(struct inode *inode, |
| 99 | struct file *file) |
| 100 | { |
| 101 | int status, level, flags; |
| 102 | struct dlmfs_filp_private *fp = NULL; |
| 103 | struct dlmfs_inode_private *ip; |
| 104 | |
| 105 | if (S_ISDIR(inode->i_mode)) |
| 106 | BUG(); |
| 107 | |
| 108 | mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino, |
| 109 | file->f_flags); |
| 110 | |
| 111 | status = dlmfs_decode_open_flags(file->f_flags, &level, &flags); |
| 112 | if (status < 0) |
| 113 | goto bail; |
| 114 | |
| 115 | /* We don't want to honor O_APPEND at read/write time as it |
| 116 | * doesn't make sense for LVB writes. */ |
| 117 | file->f_flags &= ~O_APPEND; |
| 118 | |
Kurt Hackel | ad8100e | 2006-05-01 14:25:21 -0700 | [diff] [blame^] | 119 | fp = kmalloc(sizeof(*fp), GFP_NOFS); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 120 | if (!fp) { |
| 121 | status = -ENOMEM; |
| 122 | goto bail; |
| 123 | } |
| 124 | fp->fp_lock_level = level; |
| 125 | |
| 126 | ip = DLMFS_I(inode); |
| 127 | |
| 128 | status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags); |
| 129 | if (status < 0) { |
| 130 | /* this is a strange error to return here but I want |
| 131 | * to be able userspace to be able to distinguish a |
| 132 | * valid lock request from one that simply couldn't be |
| 133 | * granted. */ |
| 134 | if (flags & LKM_NOQUEUE && status == -EAGAIN) |
| 135 | status = -ETXTBSY; |
| 136 | kfree(fp); |
| 137 | goto bail; |
| 138 | } |
| 139 | |
| 140 | file->private_data = fp; |
| 141 | bail: |
| 142 | return status; |
| 143 | } |
| 144 | |
| 145 | static int dlmfs_file_release(struct inode *inode, |
| 146 | struct file *file) |
| 147 | { |
| 148 | int level, status; |
| 149 | struct dlmfs_inode_private *ip = DLMFS_I(inode); |
| 150 | struct dlmfs_filp_private *fp = |
| 151 | (struct dlmfs_filp_private *) file->private_data; |
| 152 | |
| 153 | if (S_ISDIR(inode->i_mode)) |
| 154 | BUG(); |
| 155 | |
| 156 | mlog(0, "close called on inode %lu\n", inode->i_ino); |
| 157 | |
| 158 | status = 0; |
| 159 | if (fp) { |
| 160 | level = fp->fp_lock_level; |
| 161 | if (level != LKM_IVMODE) |
| 162 | user_dlm_cluster_unlock(&ip->ip_lockres, level); |
| 163 | |
| 164 | kfree(fp); |
| 165 | file->private_data = NULL; |
| 166 | } |
| 167 | |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | static ssize_t dlmfs_file_read(struct file *filp, |
| 172 | char __user *buf, |
| 173 | size_t count, |
| 174 | loff_t *ppos) |
| 175 | { |
| 176 | int bytes_left; |
| 177 | ssize_t readlen; |
| 178 | char *lvb_buf; |
| 179 | struct inode *inode = filp->f_dentry->d_inode; |
| 180 | |
| 181 | mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", |
| 182 | inode->i_ino, count, *ppos); |
| 183 | |
| 184 | if (*ppos >= i_size_read(inode)) |
| 185 | return 0; |
| 186 | |
| 187 | if (!count) |
| 188 | return 0; |
| 189 | |
| 190 | if (!access_ok(VERIFY_WRITE, buf, count)) |
| 191 | return -EFAULT; |
| 192 | |
| 193 | /* don't read past the lvb */ |
| 194 | if ((count + *ppos) > i_size_read(inode)) |
| 195 | readlen = i_size_read(inode) - *ppos; |
| 196 | else |
| 197 | readlen = count - *ppos; |
| 198 | |
Kurt Hackel | ad8100e | 2006-05-01 14:25:21 -0700 | [diff] [blame^] | 199 | lvb_buf = kmalloc(readlen, GFP_NOFS); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 200 | if (!lvb_buf) |
| 201 | return -ENOMEM; |
| 202 | |
| 203 | user_dlm_read_lvb(inode, lvb_buf, readlen); |
| 204 | bytes_left = __copy_to_user(buf, lvb_buf, readlen); |
| 205 | readlen -= bytes_left; |
| 206 | |
| 207 | kfree(lvb_buf); |
| 208 | |
| 209 | *ppos = *ppos + readlen; |
| 210 | |
| 211 | mlog(0, "read %zd bytes\n", readlen); |
| 212 | return readlen; |
| 213 | } |
| 214 | |
| 215 | static ssize_t dlmfs_file_write(struct file *filp, |
| 216 | const char __user *buf, |
| 217 | size_t count, |
| 218 | loff_t *ppos) |
| 219 | { |
| 220 | int bytes_left; |
| 221 | ssize_t writelen; |
| 222 | char *lvb_buf; |
| 223 | struct inode *inode = filp->f_dentry->d_inode; |
| 224 | |
| 225 | mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", |
| 226 | inode->i_ino, count, *ppos); |
| 227 | |
| 228 | if (*ppos >= i_size_read(inode)) |
| 229 | return -ENOSPC; |
| 230 | |
| 231 | if (!count) |
| 232 | return 0; |
| 233 | |
| 234 | if (!access_ok(VERIFY_READ, buf, count)) |
| 235 | return -EFAULT; |
| 236 | |
| 237 | /* don't write past the lvb */ |
| 238 | if ((count + *ppos) > i_size_read(inode)) |
| 239 | writelen = i_size_read(inode) - *ppos; |
| 240 | else |
| 241 | writelen = count - *ppos; |
| 242 | |
Kurt Hackel | ad8100e | 2006-05-01 14:25:21 -0700 | [diff] [blame^] | 243 | lvb_buf = kmalloc(writelen, GFP_NOFS); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 244 | if (!lvb_buf) |
| 245 | return -ENOMEM; |
| 246 | |
| 247 | bytes_left = copy_from_user(lvb_buf, buf, writelen); |
| 248 | writelen -= bytes_left; |
| 249 | if (writelen) |
| 250 | user_dlm_write_lvb(inode, lvb_buf, writelen); |
| 251 | |
| 252 | kfree(lvb_buf); |
| 253 | |
| 254 | *ppos = *ppos + writelen; |
| 255 | mlog(0, "wrote %zd bytes\n", writelen); |
| 256 | return writelen; |
| 257 | } |
| 258 | |
| 259 | static void dlmfs_init_once(void *foo, |
| 260 | kmem_cache_t *cachep, |
| 261 | unsigned long flags) |
| 262 | { |
| 263 | struct dlmfs_inode_private *ip = |
| 264 | (struct dlmfs_inode_private *) foo; |
| 265 | |
| 266 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
| 267 | SLAB_CTOR_CONSTRUCTOR) { |
| 268 | ip->ip_dlm = NULL; |
| 269 | ip->ip_parent = NULL; |
| 270 | |
| 271 | inode_init_once(&ip->ip_vfs_inode); |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | static struct inode *dlmfs_alloc_inode(struct super_block *sb) |
| 276 | { |
| 277 | struct dlmfs_inode_private *ip; |
| 278 | |
| 279 | ip = kmem_cache_alloc(dlmfs_inode_cache, SLAB_NOFS); |
| 280 | if (!ip) |
| 281 | return NULL; |
| 282 | |
| 283 | return &ip->ip_vfs_inode; |
| 284 | } |
| 285 | |
| 286 | static void dlmfs_destroy_inode(struct inode *inode) |
| 287 | { |
| 288 | kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode)); |
| 289 | } |
| 290 | |
| 291 | static void dlmfs_clear_inode(struct inode *inode) |
| 292 | { |
| 293 | int status; |
| 294 | struct dlmfs_inode_private *ip; |
| 295 | |
| 296 | if (!inode) |
| 297 | return; |
| 298 | |
| 299 | mlog(0, "inode %lu\n", inode->i_ino); |
| 300 | |
| 301 | ip = DLMFS_I(inode); |
| 302 | |
| 303 | if (S_ISREG(inode->i_mode)) { |
| 304 | status = user_dlm_destroy_lock(&ip->ip_lockres); |
| 305 | if (status < 0) |
| 306 | mlog_errno(status); |
| 307 | iput(ip->ip_parent); |
| 308 | goto clear_fields; |
| 309 | } |
| 310 | |
| 311 | mlog(0, "we're a directory, ip->ip_dlm = 0x%p\n", ip->ip_dlm); |
| 312 | /* we must be a directory. If required, lets unregister the |
| 313 | * dlm context now. */ |
| 314 | if (ip->ip_dlm) |
| 315 | user_dlm_unregister_context(ip->ip_dlm); |
| 316 | clear_fields: |
| 317 | ip->ip_parent = NULL; |
| 318 | ip->ip_dlm = NULL; |
| 319 | } |
| 320 | |
| 321 | static struct backing_dev_info dlmfs_backing_dev_info = { |
| 322 | .ra_pages = 0, /* No readahead */ |
| 323 | .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, |
| 324 | }; |
| 325 | |
| 326 | static struct inode *dlmfs_get_root_inode(struct super_block *sb) |
| 327 | { |
| 328 | struct inode *inode = new_inode(sb); |
| 329 | int mode = S_IFDIR | 0755; |
| 330 | struct dlmfs_inode_private *ip; |
| 331 | |
| 332 | if (inode) { |
| 333 | ip = DLMFS_I(inode); |
| 334 | |
| 335 | inode->i_mode = mode; |
| 336 | inode->i_uid = current->fsuid; |
| 337 | inode->i_gid = current->fsgid; |
| 338 | inode->i_blksize = PAGE_CACHE_SIZE; |
| 339 | inode->i_blocks = 0; |
| 340 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; |
| 341 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 342 | inode->i_nlink++; |
| 343 | |
| 344 | inode->i_fop = &simple_dir_operations; |
| 345 | inode->i_op = &dlmfs_root_inode_operations; |
| 346 | } |
| 347 | |
| 348 | return inode; |
| 349 | } |
| 350 | |
| 351 | static struct inode *dlmfs_get_inode(struct inode *parent, |
| 352 | struct dentry *dentry, |
| 353 | int mode) |
| 354 | { |
| 355 | struct super_block *sb = parent->i_sb; |
| 356 | struct inode * inode = new_inode(sb); |
| 357 | struct dlmfs_inode_private *ip; |
| 358 | |
| 359 | if (!inode) |
| 360 | return NULL; |
| 361 | |
| 362 | inode->i_mode = mode; |
| 363 | inode->i_uid = current->fsuid; |
| 364 | inode->i_gid = current->fsgid; |
| 365 | inode->i_blksize = PAGE_CACHE_SIZE; |
| 366 | inode->i_blocks = 0; |
| 367 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; |
| 368 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 369 | |
| 370 | ip = DLMFS_I(inode); |
| 371 | ip->ip_dlm = DLMFS_I(parent)->ip_dlm; |
| 372 | |
| 373 | switch (mode & S_IFMT) { |
| 374 | default: |
| 375 | /* for now we don't support anything other than |
| 376 | * directories and regular files. */ |
| 377 | BUG(); |
| 378 | break; |
| 379 | case S_IFREG: |
| 380 | inode->i_op = &dlmfs_file_inode_operations; |
| 381 | inode->i_fop = &dlmfs_file_operations; |
| 382 | |
| 383 | i_size_write(inode, DLM_LVB_LEN); |
| 384 | |
| 385 | user_dlm_lock_res_init(&ip->ip_lockres, dentry); |
| 386 | |
| 387 | /* released at clear_inode time, this insures that we |
| 388 | * get to drop the dlm reference on each lock *before* |
| 389 | * we call the unregister code for releasing parent |
| 390 | * directories. */ |
| 391 | ip->ip_parent = igrab(parent); |
| 392 | BUG_ON(!ip->ip_parent); |
| 393 | break; |
| 394 | case S_IFDIR: |
| 395 | inode->i_op = &dlmfs_dir_inode_operations; |
| 396 | inode->i_fop = &simple_dir_operations; |
| 397 | |
| 398 | /* directory inodes start off with i_nlink == |
| 399 | * 2 (for "." entry) */ |
| 400 | inode->i_nlink++; |
| 401 | break; |
| 402 | } |
| 403 | |
| 404 | if (parent->i_mode & S_ISGID) { |
| 405 | inode->i_gid = parent->i_gid; |
| 406 | if (S_ISDIR(mode)) |
| 407 | inode->i_mode |= S_ISGID; |
| 408 | } |
| 409 | |
| 410 | return inode; |
| 411 | } |
| 412 | |
| 413 | /* |
| 414 | * File creation. Allocate an inode, and we're done.. |
| 415 | */ |
| 416 | /* SMP-safe */ |
| 417 | static int dlmfs_mkdir(struct inode * dir, |
| 418 | struct dentry * dentry, |
| 419 | int mode) |
| 420 | { |
| 421 | int status; |
| 422 | struct inode *inode = NULL; |
| 423 | struct qstr *domain = &dentry->d_name; |
| 424 | struct dlmfs_inode_private *ip; |
| 425 | struct dlm_ctxt *dlm; |
| 426 | |
| 427 | mlog(0, "mkdir %.*s\n", domain->len, domain->name); |
| 428 | |
| 429 | /* verify that we have a proper domain */ |
| 430 | if (domain->len >= O2NM_MAX_NAME_LEN) { |
| 431 | status = -EINVAL; |
| 432 | mlog(ML_ERROR, "invalid domain name for directory.\n"); |
| 433 | goto bail; |
| 434 | } |
| 435 | |
| 436 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR); |
| 437 | if (!inode) { |
| 438 | status = -ENOMEM; |
| 439 | mlog_errno(status); |
| 440 | goto bail; |
| 441 | } |
| 442 | |
| 443 | ip = DLMFS_I(inode); |
| 444 | |
| 445 | dlm = user_dlm_register_context(domain); |
| 446 | if (IS_ERR(dlm)) { |
| 447 | status = PTR_ERR(dlm); |
| 448 | mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n", |
| 449 | status, domain->len, domain->name); |
| 450 | goto bail; |
| 451 | } |
| 452 | ip->ip_dlm = dlm; |
| 453 | |
| 454 | dir->i_nlink++; |
| 455 | d_instantiate(dentry, inode); |
| 456 | dget(dentry); /* Extra count - pin the dentry in core */ |
| 457 | |
| 458 | status = 0; |
| 459 | bail: |
| 460 | if (status < 0) |
| 461 | iput(inode); |
| 462 | return status; |
| 463 | } |
| 464 | |
| 465 | static int dlmfs_create(struct inode *dir, |
| 466 | struct dentry *dentry, |
| 467 | int mode, |
| 468 | struct nameidata *nd) |
| 469 | { |
| 470 | int status = 0; |
| 471 | struct inode *inode; |
| 472 | struct qstr *name = &dentry->d_name; |
| 473 | |
| 474 | mlog(0, "create %.*s\n", name->len, name->name); |
| 475 | |
| 476 | /* verify name is valid and doesn't contain any dlm reserved |
| 477 | * characters */ |
| 478 | if (name->len >= USER_DLM_LOCK_ID_MAX_LEN || |
| 479 | name->name[0] == '$') { |
| 480 | status = -EINVAL; |
| 481 | mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len, |
| 482 | name->name); |
| 483 | goto bail; |
| 484 | } |
| 485 | |
| 486 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG); |
| 487 | if (!inode) { |
| 488 | status = -ENOMEM; |
| 489 | mlog_errno(status); |
| 490 | goto bail; |
| 491 | } |
| 492 | |
| 493 | d_instantiate(dentry, inode); |
| 494 | dget(dentry); /* Extra count - pin the dentry in core */ |
| 495 | bail: |
| 496 | return status; |
| 497 | } |
| 498 | |
| 499 | static int dlmfs_unlink(struct inode *dir, |
| 500 | struct dentry *dentry) |
| 501 | { |
| 502 | int status; |
| 503 | struct inode *inode = dentry->d_inode; |
| 504 | |
| 505 | mlog(0, "unlink inode %lu\n", inode->i_ino); |
| 506 | |
| 507 | /* if there are no current holders, or none that are waiting |
| 508 | * to acquire a lock, this basically destroys our lockres. */ |
| 509 | status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres); |
| 510 | if (status < 0) { |
| 511 | mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n", |
| 512 | dentry->d_name.len, dentry->d_name.name, status); |
| 513 | goto bail; |
| 514 | } |
| 515 | status = simple_unlink(dir, dentry); |
| 516 | bail: |
| 517 | return status; |
| 518 | } |
| 519 | |
| 520 | static int dlmfs_fill_super(struct super_block * sb, |
| 521 | void * data, |
| 522 | int silent) |
| 523 | { |
| 524 | struct inode * inode; |
| 525 | struct dentry * root; |
| 526 | |
| 527 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
| 528 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 529 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 530 | sb->s_magic = DLMFS_MAGIC; |
| 531 | sb->s_op = &dlmfs_ops; |
| 532 | inode = dlmfs_get_root_inode(sb); |
| 533 | if (!inode) |
| 534 | return -ENOMEM; |
| 535 | |
| 536 | root = d_alloc_root(inode); |
| 537 | if (!root) { |
| 538 | iput(inode); |
| 539 | return -ENOMEM; |
| 540 | } |
| 541 | sb->s_root = root; |
| 542 | return 0; |
| 543 | } |
| 544 | |
| 545 | static struct file_operations dlmfs_file_operations = { |
| 546 | .open = dlmfs_file_open, |
| 547 | .release = dlmfs_file_release, |
| 548 | .read = dlmfs_file_read, |
| 549 | .write = dlmfs_file_write, |
| 550 | }; |
| 551 | |
| 552 | static struct inode_operations dlmfs_dir_inode_operations = { |
| 553 | .create = dlmfs_create, |
| 554 | .lookup = simple_lookup, |
| 555 | .unlink = dlmfs_unlink, |
| 556 | }; |
| 557 | |
| 558 | /* this way we can restrict mkdir to only the toplevel of the fs. */ |
| 559 | static struct inode_operations dlmfs_root_inode_operations = { |
| 560 | .lookup = simple_lookup, |
| 561 | .mkdir = dlmfs_mkdir, |
| 562 | .rmdir = simple_rmdir, |
| 563 | }; |
| 564 | |
| 565 | static struct super_operations dlmfs_ops = { |
| 566 | .statfs = simple_statfs, |
| 567 | .alloc_inode = dlmfs_alloc_inode, |
| 568 | .destroy_inode = dlmfs_destroy_inode, |
| 569 | .clear_inode = dlmfs_clear_inode, |
| 570 | .drop_inode = generic_delete_inode, |
| 571 | }; |
| 572 | |
| 573 | static struct inode_operations dlmfs_file_inode_operations = { |
| 574 | .getattr = simple_getattr, |
| 575 | }; |
| 576 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 577 | static int dlmfs_get_sb(struct file_system_type *fs_type, |
| 578 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 579 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 580 | return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 581 | } |
| 582 | |
| 583 | static struct file_system_type dlmfs_fs_type = { |
| 584 | .owner = THIS_MODULE, |
| 585 | .name = "ocfs2_dlmfs", |
| 586 | .get_sb = dlmfs_get_sb, |
| 587 | .kill_sb = kill_litter_super, |
| 588 | }; |
| 589 | |
| 590 | static int __init init_dlmfs_fs(void) |
| 591 | { |
| 592 | int status; |
| 593 | int cleanup_inode = 0, cleanup_worker = 0; |
| 594 | |
| 595 | dlmfs_print_version(); |
| 596 | |
| 597 | dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache", |
| 598 | sizeof(struct dlmfs_inode_private), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 599 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
| 600 | SLAB_MEM_SPREAD), |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 601 | dlmfs_init_once, NULL); |
| 602 | if (!dlmfs_inode_cache) |
| 603 | return -ENOMEM; |
| 604 | cleanup_inode = 1; |
| 605 | |
| 606 | user_dlm_worker = create_singlethread_workqueue("user_dlm"); |
| 607 | if (!user_dlm_worker) { |
| 608 | status = -ENOMEM; |
| 609 | goto bail; |
| 610 | } |
| 611 | cleanup_worker = 1; |
| 612 | |
| 613 | status = register_filesystem(&dlmfs_fs_type); |
| 614 | bail: |
| 615 | if (status) { |
| 616 | if (cleanup_inode) |
| 617 | kmem_cache_destroy(dlmfs_inode_cache); |
| 618 | if (cleanup_worker) |
| 619 | destroy_workqueue(user_dlm_worker); |
| 620 | } else |
| 621 | printk("OCFS2 User DLM kernel interface loaded\n"); |
| 622 | return status; |
| 623 | } |
| 624 | |
| 625 | static void __exit exit_dlmfs_fs(void) |
| 626 | { |
| 627 | unregister_filesystem(&dlmfs_fs_type); |
| 628 | |
| 629 | flush_workqueue(user_dlm_worker); |
| 630 | destroy_workqueue(user_dlm_worker); |
| 631 | |
| 632 | if (kmem_cache_destroy(dlmfs_inode_cache)) |
| 633 | printk(KERN_INFO "dlmfs_inode_cache: not all structures " |
| 634 | "were freed\n"); |
| 635 | } |
| 636 | |
| 637 | MODULE_AUTHOR("Oracle"); |
| 638 | MODULE_LICENSE("GPL"); |
| 639 | |
| 640 | module_init(init_dlmfs_fs) |
| 641 | module_exit(exit_dlmfs_fs) |