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> |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 45 | #include <linux/backing-dev.h> |
| 46 | |
| 47 | #include <asm/uaccess.h> |
| 48 | |
| 49 | |
| 50 | #include "cluster/nodemanager.h" |
| 51 | #include "cluster/heartbeat.h" |
| 52 | #include "cluster/tcp.h" |
| 53 | |
| 54 | #include "dlmapi.h" |
| 55 | |
| 56 | #include "userdlm.h" |
| 57 | |
| 58 | #include "dlmfsver.h" |
| 59 | |
| 60 | #define MLOG_MASK_PREFIX ML_DLMFS |
| 61 | #include "cluster/masklog.h" |
| 62 | |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 63 | #include "ocfs2_lockingver.h" |
| 64 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 65 | static const struct super_operations dlmfs_ops; |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 66 | static const struct file_operations dlmfs_file_operations; |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 67 | static const struct inode_operations dlmfs_dir_inode_operations; |
| 68 | static const struct inode_operations dlmfs_root_inode_operations; |
| 69 | static const struct inode_operations dlmfs_file_inode_operations; |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 70 | static struct kmem_cache *dlmfs_inode_cache; |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 71 | |
| 72 | struct workqueue_struct *user_dlm_worker; |
| 73 | |
| 74 | /* |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 75 | * This is the userdlmfs locking protocol version. |
| 76 | * |
| 77 | * See fs/ocfs2/dlmglue.c for more details on locking versions. |
| 78 | */ |
| 79 | static const struct dlm_protocol_version user_locking_protocol = { |
| 80 | .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR, |
| 81 | .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR, |
| 82 | }; |
| 83 | |
| 84 | /* |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 85 | * decodes a set of open flags into a valid lock level and a set of flags. |
| 86 | * returns < 0 if we have invalid flags |
| 87 | * flags which mean something to us: |
| 88 | * O_RDONLY -> PRMODE level |
| 89 | * O_WRONLY -> EXMODE level |
| 90 | * |
| 91 | * O_NONBLOCK -> LKM_NOQUEUE |
| 92 | */ |
| 93 | static int dlmfs_decode_open_flags(int open_flags, |
| 94 | int *level, |
| 95 | int *flags) |
| 96 | { |
| 97 | if (open_flags & (O_WRONLY|O_RDWR)) |
| 98 | *level = LKM_EXMODE; |
| 99 | else |
| 100 | *level = LKM_PRMODE; |
| 101 | |
| 102 | *flags = 0; |
| 103 | if (open_flags & O_NONBLOCK) |
| 104 | *flags |= LKM_NOQUEUE; |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static int dlmfs_file_open(struct inode *inode, |
| 110 | struct file *file) |
| 111 | { |
| 112 | int status, level, flags; |
| 113 | struct dlmfs_filp_private *fp = NULL; |
| 114 | struct dlmfs_inode_private *ip; |
| 115 | |
| 116 | if (S_ISDIR(inode->i_mode)) |
| 117 | BUG(); |
| 118 | |
| 119 | mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino, |
| 120 | file->f_flags); |
| 121 | |
| 122 | status = dlmfs_decode_open_flags(file->f_flags, &level, &flags); |
| 123 | if (status < 0) |
| 124 | goto bail; |
| 125 | |
| 126 | /* We don't want to honor O_APPEND at read/write time as it |
| 127 | * doesn't make sense for LVB writes. */ |
| 128 | file->f_flags &= ~O_APPEND; |
| 129 | |
Kurt Hackel | ad8100e | 2006-05-01 14:25:21 -0700 | [diff] [blame] | 130 | fp = kmalloc(sizeof(*fp), GFP_NOFS); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 131 | if (!fp) { |
| 132 | status = -ENOMEM; |
| 133 | goto bail; |
| 134 | } |
| 135 | fp->fp_lock_level = level; |
| 136 | |
| 137 | ip = DLMFS_I(inode); |
| 138 | |
| 139 | status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags); |
| 140 | if (status < 0) { |
| 141 | /* this is a strange error to return here but I want |
| 142 | * to be able userspace to be able to distinguish a |
| 143 | * valid lock request from one that simply couldn't be |
| 144 | * granted. */ |
| 145 | if (flags & LKM_NOQUEUE && status == -EAGAIN) |
| 146 | status = -ETXTBSY; |
| 147 | kfree(fp); |
| 148 | goto bail; |
| 149 | } |
| 150 | |
| 151 | file->private_data = fp; |
| 152 | bail: |
| 153 | return status; |
| 154 | } |
| 155 | |
| 156 | static int dlmfs_file_release(struct inode *inode, |
| 157 | struct file *file) |
| 158 | { |
| 159 | int level, status; |
| 160 | struct dlmfs_inode_private *ip = DLMFS_I(inode); |
| 161 | struct dlmfs_filp_private *fp = |
| 162 | (struct dlmfs_filp_private *) file->private_data; |
| 163 | |
| 164 | if (S_ISDIR(inode->i_mode)) |
| 165 | BUG(); |
| 166 | |
| 167 | mlog(0, "close called on inode %lu\n", inode->i_ino); |
| 168 | |
| 169 | status = 0; |
| 170 | if (fp) { |
| 171 | level = fp->fp_lock_level; |
| 172 | if (level != LKM_IVMODE) |
| 173 | user_dlm_cluster_unlock(&ip->ip_lockres, level); |
| 174 | |
| 175 | kfree(fp); |
| 176 | file->private_data = NULL; |
| 177 | } |
| 178 | |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | static ssize_t dlmfs_file_read(struct file *filp, |
| 183 | char __user *buf, |
| 184 | size_t count, |
| 185 | loff_t *ppos) |
| 186 | { |
| 187 | int bytes_left; |
| 188 | ssize_t readlen; |
| 189 | char *lvb_buf; |
Josef Sipek | d28c917 | 2006-12-08 02:37:25 -0800 | [diff] [blame] | 190 | struct inode *inode = filp->f_path.dentry->d_inode; |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 191 | |
| 192 | mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", |
| 193 | inode->i_ino, count, *ppos); |
| 194 | |
| 195 | if (*ppos >= i_size_read(inode)) |
| 196 | return 0; |
| 197 | |
| 198 | if (!count) |
| 199 | return 0; |
| 200 | |
| 201 | if (!access_ok(VERIFY_WRITE, buf, count)) |
| 202 | return -EFAULT; |
| 203 | |
| 204 | /* don't read past the lvb */ |
| 205 | if ((count + *ppos) > i_size_read(inode)) |
| 206 | readlen = i_size_read(inode) - *ppos; |
| 207 | else |
| 208 | readlen = count - *ppos; |
| 209 | |
Kurt Hackel | ad8100e | 2006-05-01 14:25:21 -0700 | [diff] [blame] | 210 | lvb_buf = kmalloc(readlen, GFP_NOFS); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 211 | if (!lvb_buf) |
| 212 | return -ENOMEM; |
| 213 | |
| 214 | user_dlm_read_lvb(inode, lvb_buf, readlen); |
| 215 | bytes_left = __copy_to_user(buf, lvb_buf, readlen); |
| 216 | readlen -= bytes_left; |
| 217 | |
| 218 | kfree(lvb_buf); |
| 219 | |
| 220 | *ppos = *ppos + readlen; |
| 221 | |
| 222 | mlog(0, "read %zd bytes\n", readlen); |
| 223 | return readlen; |
| 224 | } |
| 225 | |
| 226 | static ssize_t dlmfs_file_write(struct file *filp, |
| 227 | const char __user *buf, |
| 228 | size_t count, |
| 229 | loff_t *ppos) |
| 230 | { |
| 231 | int bytes_left; |
| 232 | ssize_t writelen; |
| 233 | char *lvb_buf; |
Josef Sipek | d28c917 | 2006-12-08 02:37:25 -0800 | [diff] [blame] | 234 | struct inode *inode = filp->f_path.dentry->d_inode; |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 235 | |
| 236 | mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", |
| 237 | inode->i_ino, count, *ppos); |
| 238 | |
| 239 | if (*ppos >= i_size_read(inode)) |
| 240 | return -ENOSPC; |
| 241 | |
| 242 | if (!count) |
| 243 | return 0; |
| 244 | |
| 245 | if (!access_ok(VERIFY_READ, buf, count)) |
| 246 | return -EFAULT; |
| 247 | |
| 248 | /* don't write past the lvb */ |
| 249 | if ((count + *ppos) > i_size_read(inode)) |
| 250 | writelen = i_size_read(inode) - *ppos; |
| 251 | else |
| 252 | writelen = count - *ppos; |
| 253 | |
Kurt Hackel | ad8100e | 2006-05-01 14:25:21 -0700 | [diff] [blame] | 254 | lvb_buf = kmalloc(writelen, GFP_NOFS); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 255 | if (!lvb_buf) |
| 256 | return -ENOMEM; |
| 257 | |
| 258 | bytes_left = copy_from_user(lvb_buf, buf, writelen); |
| 259 | writelen -= bytes_left; |
| 260 | if (writelen) |
| 261 | user_dlm_write_lvb(inode, lvb_buf, writelen); |
| 262 | |
| 263 | kfree(lvb_buf); |
| 264 | |
| 265 | *ppos = *ppos + writelen; |
| 266 | mlog(0, "wrote %zd bytes\n", writelen); |
| 267 | return writelen; |
| 268 | } |
| 269 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 270 | static void dlmfs_init_once(void *foo) |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 271 | { |
| 272 | struct dlmfs_inode_private *ip = |
| 273 | (struct dlmfs_inode_private *) foo; |
| 274 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 275 | ip->ip_dlm = NULL; |
| 276 | ip->ip_parent = NULL; |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 277 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 278 | inode_init_once(&ip->ip_vfs_inode); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 279 | } |
| 280 | |
| 281 | static struct inode *dlmfs_alloc_inode(struct super_block *sb) |
| 282 | { |
| 283 | struct dlmfs_inode_private *ip; |
| 284 | |
Christoph Lameter | e6b4f8d | 2006-12-06 20:33:14 -0800 | [diff] [blame] | 285 | ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 286 | if (!ip) |
| 287 | return NULL; |
| 288 | |
| 289 | return &ip->ip_vfs_inode; |
| 290 | } |
| 291 | |
| 292 | static void dlmfs_destroy_inode(struct inode *inode) |
| 293 | { |
| 294 | kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode)); |
| 295 | } |
| 296 | |
| 297 | static void dlmfs_clear_inode(struct inode *inode) |
| 298 | { |
| 299 | int status; |
| 300 | struct dlmfs_inode_private *ip; |
| 301 | |
| 302 | if (!inode) |
| 303 | return; |
| 304 | |
| 305 | mlog(0, "inode %lu\n", inode->i_ino); |
| 306 | |
| 307 | ip = DLMFS_I(inode); |
| 308 | |
| 309 | if (S_ISREG(inode->i_mode)) { |
| 310 | status = user_dlm_destroy_lock(&ip->ip_lockres); |
| 311 | if (status < 0) |
| 312 | mlog_errno(status); |
| 313 | iput(ip->ip_parent); |
| 314 | goto clear_fields; |
| 315 | } |
| 316 | |
| 317 | mlog(0, "we're a directory, ip->ip_dlm = 0x%p\n", ip->ip_dlm); |
| 318 | /* we must be a directory. If required, lets unregister the |
| 319 | * dlm context now. */ |
| 320 | if (ip->ip_dlm) |
| 321 | user_dlm_unregister_context(ip->ip_dlm); |
| 322 | clear_fields: |
| 323 | ip->ip_parent = NULL; |
| 324 | ip->ip_dlm = NULL; |
| 325 | } |
| 326 | |
| 327 | static struct backing_dev_info dlmfs_backing_dev_info = { |
| 328 | .ra_pages = 0, /* No readahead */ |
Miklos Szeredi | e4ad08f | 2008-04-30 00:54:37 -0700 | [diff] [blame] | 329 | .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 330 | }; |
| 331 | |
| 332 | static struct inode *dlmfs_get_root_inode(struct super_block *sb) |
| 333 | { |
| 334 | struct inode *inode = new_inode(sb); |
| 335 | int mode = S_IFDIR | 0755; |
| 336 | struct dlmfs_inode_private *ip; |
| 337 | |
| 338 | if (inode) { |
| 339 | ip = DLMFS_I(inode); |
| 340 | |
| 341 | inode->i_mode = mode; |
| 342 | inode->i_uid = current->fsuid; |
| 343 | inode->i_gid = current->fsgid; |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 344 | inode->i_blocks = 0; |
| 345 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; |
| 346 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 347 | inc_nlink(inode); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 348 | |
| 349 | inode->i_fop = &simple_dir_operations; |
| 350 | inode->i_op = &dlmfs_root_inode_operations; |
| 351 | } |
| 352 | |
| 353 | return inode; |
| 354 | } |
| 355 | |
| 356 | static struct inode *dlmfs_get_inode(struct inode *parent, |
| 357 | struct dentry *dentry, |
| 358 | int mode) |
| 359 | { |
| 360 | struct super_block *sb = parent->i_sb; |
| 361 | struct inode * inode = new_inode(sb); |
| 362 | struct dlmfs_inode_private *ip; |
| 363 | |
| 364 | if (!inode) |
| 365 | return NULL; |
| 366 | |
| 367 | inode->i_mode = mode; |
| 368 | inode->i_uid = current->fsuid; |
| 369 | inode->i_gid = current->fsgid; |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 370 | inode->i_blocks = 0; |
| 371 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; |
| 372 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 373 | |
| 374 | ip = DLMFS_I(inode); |
| 375 | ip->ip_dlm = DLMFS_I(parent)->ip_dlm; |
| 376 | |
| 377 | switch (mode & S_IFMT) { |
| 378 | default: |
| 379 | /* for now we don't support anything other than |
| 380 | * directories and regular files. */ |
| 381 | BUG(); |
| 382 | break; |
| 383 | case S_IFREG: |
| 384 | inode->i_op = &dlmfs_file_inode_operations; |
| 385 | inode->i_fop = &dlmfs_file_operations; |
| 386 | |
| 387 | i_size_write(inode, DLM_LVB_LEN); |
| 388 | |
| 389 | user_dlm_lock_res_init(&ip->ip_lockres, dentry); |
| 390 | |
| 391 | /* released at clear_inode time, this insures that we |
| 392 | * get to drop the dlm reference on each lock *before* |
| 393 | * we call the unregister code for releasing parent |
| 394 | * directories. */ |
| 395 | ip->ip_parent = igrab(parent); |
| 396 | BUG_ON(!ip->ip_parent); |
| 397 | break; |
| 398 | case S_IFDIR: |
| 399 | inode->i_op = &dlmfs_dir_inode_operations; |
| 400 | inode->i_fop = &simple_dir_operations; |
| 401 | |
| 402 | /* directory inodes start off with i_nlink == |
| 403 | * 2 (for "." entry) */ |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 404 | inc_nlink(inode); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 405 | break; |
| 406 | } |
| 407 | |
| 408 | if (parent->i_mode & S_ISGID) { |
| 409 | inode->i_gid = parent->i_gid; |
| 410 | if (S_ISDIR(mode)) |
| 411 | inode->i_mode |= S_ISGID; |
| 412 | } |
| 413 | |
| 414 | return inode; |
| 415 | } |
| 416 | |
| 417 | /* |
| 418 | * File creation. Allocate an inode, and we're done.. |
| 419 | */ |
| 420 | /* SMP-safe */ |
| 421 | static int dlmfs_mkdir(struct inode * dir, |
| 422 | struct dentry * dentry, |
| 423 | int mode) |
| 424 | { |
| 425 | int status; |
| 426 | struct inode *inode = NULL; |
| 427 | struct qstr *domain = &dentry->d_name; |
| 428 | struct dlmfs_inode_private *ip; |
| 429 | struct dlm_ctxt *dlm; |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 430 | struct dlm_protocol_version proto = user_locking_protocol; |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 431 | |
| 432 | mlog(0, "mkdir %.*s\n", domain->len, domain->name); |
| 433 | |
| 434 | /* verify that we have a proper domain */ |
| 435 | if (domain->len >= O2NM_MAX_NAME_LEN) { |
| 436 | status = -EINVAL; |
| 437 | mlog(ML_ERROR, "invalid domain name for directory.\n"); |
| 438 | goto bail; |
| 439 | } |
| 440 | |
| 441 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR); |
| 442 | if (!inode) { |
| 443 | status = -ENOMEM; |
| 444 | mlog_errno(status); |
| 445 | goto bail; |
| 446 | } |
| 447 | |
| 448 | ip = DLMFS_I(inode); |
| 449 | |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 450 | dlm = user_dlm_register_context(domain, &proto); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 451 | if (IS_ERR(dlm)) { |
| 452 | status = PTR_ERR(dlm); |
| 453 | mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n", |
| 454 | status, domain->len, domain->name); |
| 455 | goto bail; |
| 456 | } |
| 457 | ip->ip_dlm = dlm; |
| 458 | |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 459 | inc_nlink(dir); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 460 | d_instantiate(dentry, inode); |
| 461 | dget(dentry); /* Extra count - pin the dentry in core */ |
| 462 | |
| 463 | status = 0; |
| 464 | bail: |
| 465 | if (status < 0) |
| 466 | iput(inode); |
| 467 | return status; |
| 468 | } |
| 469 | |
| 470 | static int dlmfs_create(struct inode *dir, |
| 471 | struct dentry *dentry, |
| 472 | int mode, |
| 473 | struct nameidata *nd) |
| 474 | { |
| 475 | int status = 0; |
| 476 | struct inode *inode; |
| 477 | struct qstr *name = &dentry->d_name; |
| 478 | |
| 479 | mlog(0, "create %.*s\n", name->len, name->name); |
| 480 | |
| 481 | /* verify name is valid and doesn't contain any dlm reserved |
| 482 | * characters */ |
| 483 | if (name->len >= USER_DLM_LOCK_ID_MAX_LEN || |
| 484 | name->name[0] == '$') { |
| 485 | status = -EINVAL; |
| 486 | mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len, |
| 487 | name->name); |
| 488 | goto bail; |
| 489 | } |
| 490 | |
| 491 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG); |
| 492 | if (!inode) { |
| 493 | status = -ENOMEM; |
| 494 | mlog_errno(status); |
| 495 | goto bail; |
| 496 | } |
| 497 | |
| 498 | d_instantiate(dentry, inode); |
| 499 | dget(dentry); /* Extra count - pin the dentry in core */ |
| 500 | bail: |
| 501 | return status; |
| 502 | } |
| 503 | |
| 504 | static int dlmfs_unlink(struct inode *dir, |
| 505 | struct dentry *dentry) |
| 506 | { |
| 507 | int status; |
| 508 | struct inode *inode = dentry->d_inode; |
| 509 | |
| 510 | mlog(0, "unlink inode %lu\n", inode->i_ino); |
| 511 | |
| 512 | /* if there are no current holders, or none that are waiting |
| 513 | * to acquire a lock, this basically destroys our lockres. */ |
| 514 | status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres); |
| 515 | if (status < 0) { |
| 516 | mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n", |
| 517 | dentry->d_name.len, dentry->d_name.name, status); |
| 518 | goto bail; |
| 519 | } |
| 520 | status = simple_unlink(dir, dentry); |
| 521 | bail: |
| 522 | return status; |
| 523 | } |
| 524 | |
| 525 | static int dlmfs_fill_super(struct super_block * sb, |
| 526 | void * data, |
| 527 | int silent) |
| 528 | { |
| 529 | struct inode * inode; |
| 530 | struct dentry * root; |
| 531 | |
| 532 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
| 533 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 534 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 535 | sb->s_magic = DLMFS_MAGIC; |
| 536 | sb->s_op = &dlmfs_ops; |
| 537 | inode = dlmfs_get_root_inode(sb); |
| 538 | if (!inode) |
| 539 | return -ENOMEM; |
| 540 | |
| 541 | root = d_alloc_root(inode); |
| 542 | if (!root) { |
| 543 | iput(inode); |
| 544 | return -ENOMEM; |
| 545 | } |
| 546 | sb->s_root = root; |
| 547 | return 0; |
| 548 | } |
| 549 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 550 | static const struct file_operations dlmfs_file_operations = { |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 551 | .open = dlmfs_file_open, |
| 552 | .release = dlmfs_file_release, |
| 553 | .read = dlmfs_file_read, |
| 554 | .write = dlmfs_file_write, |
| 555 | }; |
| 556 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 557 | static const struct inode_operations dlmfs_dir_inode_operations = { |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 558 | .create = dlmfs_create, |
| 559 | .lookup = simple_lookup, |
| 560 | .unlink = dlmfs_unlink, |
| 561 | }; |
| 562 | |
| 563 | /* this way we can restrict mkdir to only the toplevel of the fs. */ |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 564 | static const struct inode_operations dlmfs_root_inode_operations = { |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 565 | .lookup = simple_lookup, |
| 566 | .mkdir = dlmfs_mkdir, |
| 567 | .rmdir = simple_rmdir, |
| 568 | }; |
| 569 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 570 | static const struct super_operations dlmfs_ops = { |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 571 | .statfs = simple_statfs, |
| 572 | .alloc_inode = dlmfs_alloc_inode, |
| 573 | .destroy_inode = dlmfs_destroy_inode, |
| 574 | .clear_inode = dlmfs_clear_inode, |
| 575 | .drop_inode = generic_delete_inode, |
| 576 | }; |
| 577 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 578 | static const struct inode_operations dlmfs_file_inode_operations = { |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 579 | .getattr = simple_getattr, |
| 580 | }; |
| 581 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 582 | static int dlmfs_get_sb(struct file_system_type *fs_type, |
| 583 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 584 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 585 | return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 586 | } |
| 587 | |
| 588 | static struct file_system_type dlmfs_fs_type = { |
| 589 | .owner = THIS_MODULE, |
| 590 | .name = "ocfs2_dlmfs", |
| 591 | .get_sb = dlmfs_get_sb, |
| 592 | .kill_sb = kill_litter_super, |
| 593 | }; |
| 594 | |
| 595 | static int __init init_dlmfs_fs(void) |
| 596 | { |
| 597 | int status; |
| 598 | int cleanup_inode = 0, cleanup_worker = 0; |
| 599 | |
| 600 | dlmfs_print_version(); |
| 601 | |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 602 | status = bdi_init(&dlmfs_backing_dev_info); |
| 603 | if (status) |
| 604 | return status; |
| 605 | |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 606 | dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache", |
| 607 | sizeof(struct dlmfs_inode_private), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 608 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
| 609 | SLAB_MEM_SPREAD), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 610 | dlmfs_init_once); |
Coly Li | 07d9a39 | 2008-11-17 12:38:22 +0800 | [diff] [blame] | 611 | if (!dlmfs_inode_cache) { |
| 612 | status = -ENOMEM; |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 613 | goto bail; |
Coly Li | 07d9a39 | 2008-11-17 12:38:22 +0800 | [diff] [blame] | 614 | } |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 615 | cleanup_inode = 1; |
| 616 | |
| 617 | user_dlm_worker = create_singlethread_workqueue("user_dlm"); |
| 618 | if (!user_dlm_worker) { |
| 619 | status = -ENOMEM; |
| 620 | goto bail; |
| 621 | } |
| 622 | cleanup_worker = 1; |
| 623 | |
| 624 | status = register_filesystem(&dlmfs_fs_type); |
| 625 | bail: |
| 626 | if (status) { |
| 627 | if (cleanup_inode) |
| 628 | kmem_cache_destroy(dlmfs_inode_cache); |
| 629 | if (cleanup_worker) |
| 630 | destroy_workqueue(user_dlm_worker); |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 631 | bdi_destroy(&dlmfs_backing_dev_info); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 632 | } else |
| 633 | printk("OCFS2 User DLM kernel interface loaded\n"); |
| 634 | return status; |
| 635 | } |
| 636 | |
| 637 | static void __exit exit_dlmfs_fs(void) |
| 638 | { |
| 639 | unregister_filesystem(&dlmfs_fs_type); |
| 640 | |
| 641 | flush_workqueue(user_dlm_worker); |
| 642 | destroy_workqueue(user_dlm_worker); |
| 643 | |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 644 | kmem_cache_destroy(dlmfs_inode_cache); |
Peter Zijlstra | e0bf68d | 2007-10-16 23:25:46 -0700 | [diff] [blame] | 645 | |
| 646 | bdi_destroy(&dlmfs_backing_dev_info); |
Mark Fasheh | 8df08c8 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 647 | } |
| 648 | |
| 649 | MODULE_AUTHOR("Oracle"); |
| 650 | MODULE_LICENSE("GPL"); |
| 651 | |
| 652 | module_init(init_dlmfs_fs) |
| 653 | module_exit(exit_dlmfs_fs) |