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1 /* -*- mode: c; c-basic-offset: 8; -*- 1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0: 2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 * 3 *
4 * dlmfs.c 4 * dlmfs.c
5 * 5 *
6 * Code which implements the kernel side of a 6 * Code which implements the kernel side of a minimal userspace
7 * interface to our DLM. This file handles the 7 * interface to our DLM. This file handles the virtual file system
8 * used for communication with userspace. Cred 8 * used for communication with userspace. Credit should go to ramfs,
9 * which was a template for the fs side of thi 9 * which was a template for the fs side of this module.
10 * 10 *
11 * Copyright (C) 2003, 2004 Oracle. All right 11 * Copyright (C) 2003, 2004 Oracle. All rights reserved.
12 * 12 *
13 * This program is free software; you can redi 13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU Genera 14 * modify it under the terms of the GNU General Public
15 * License as published by the Free Software F 15 * License as published by the Free Software Foundation; either
16 * version 2 of the License, or (at your optio 16 * version 2 of the License, or (at your option) any later version.
17 * 17 *
18 * This program is distributed in the hope tha 18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details. 21 * General Public License for more details.
22 * 22 *
23 * You should have received a copy of the GNU 23 * You should have received a copy of the GNU General Public
24 * License along with this program; if not, wr 24 * License along with this program; if not, write to the
25 * Free Software Foundation, Inc., 59 Temple P 25 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
26 * Boston, MA 021110-1307, USA. 26 * Boston, MA 021110-1307, USA.
27 */ 27 */
28 28
29 /* Simple VFS hooks based on: */ 29 /* Simple VFS hooks based on: */
30 /* 30 /*
31 * Resizable simple ram filesystem for Linux. 31 * Resizable simple ram filesystem for Linux.
32 * 32 *
33 * Copyright (C) 2000 Linus Torvalds. 33 * Copyright (C) 2000 Linus Torvalds.
34 * 2000 Transmeta Corp. 34 * 2000 Transmeta Corp.
35 */ 35 */
36 36
37 #include <linux/module.h> 37 #include <linux/module.h>
38 #include <linux/fs.h> 38 #include <linux/fs.h>
39 #include <linux/pagemap.h> 39 #include <linux/pagemap.h>
40 #include <linux/types.h> 40 #include <linux/types.h>
41 #include <linux/slab.h> 41 #include <linux/slab.h>
42 #include <linux/highmem.h> 42 #include <linux/highmem.h>
43 #include <linux/init.h> 43 #include <linux/init.h>
44 #include <linux/string.h> 44 #include <linux/string.h>
45 #include <linux/backing-dev.h> 45 #include <linux/backing-dev.h>
46 46
47 #include <asm/uaccess.h> 47 #include <asm/uaccess.h>
48 48
49 49
50 #include "cluster/nodemanager.h" 50 #include "cluster/nodemanager.h"
51 #include "cluster/heartbeat.h" 51 #include "cluster/heartbeat.h"
52 #include "cluster/tcp.h" 52 #include "cluster/tcp.h"
53 53
54 #include "dlmapi.h" 54 #include "dlmapi.h"
55 55
56 #include "userdlm.h" 56 #include "userdlm.h"
57 57
58 #include "dlmfsver.h" 58 #include "dlmfsver.h"
59 59
60 #define MLOG_MASK_PREFIX ML_DLMFS 60 #define MLOG_MASK_PREFIX ML_DLMFS
61 #include "cluster/masklog.h" 61 #include "cluster/masklog.h"
62 62
63 #include "ocfs2_lockingver.h" 63 #include "ocfs2_lockingver.h"
64 64
65 static const struct super_operations dlmfs_ops 65 static const struct super_operations dlmfs_ops;
66 static const struct file_operations dlmfs_file 66 static const struct file_operations dlmfs_file_operations;
67 static const struct inode_operations dlmfs_dir 67 static const struct inode_operations dlmfs_dir_inode_operations;
68 static const struct inode_operations dlmfs_roo 68 static const struct inode_operations dlmfs_root_inode_operations;
69 static const struct inode_operations dlmfs_fil 69 static const struct inode_operations dlmfs_file_inode_operations;
70 static struct kmem_cache *dlmfs_inode_cache; 70 static struct kmem_cache *dlmfs_inode_cache;
71 71
72 struct workqueue_struct *user_dlm_worker; 72 struct workqueue_struct *user_dlm_worker;
73 73
74 /* 74 /*
75 * This is the userdlmfs locking protocol vers 75 * This is the userdlmfs locking protocol version.
76 * 76 *
77 * See fs/ocfs2/dlmglue.c for more details on 77 * See fs/ocfs2/dlmglue.c for more details on locking versions.
78 */ 78 */
79 static const struct dlm_protocol_version user_ 79 static const struct dlm_protocol_version user_locking_protocol = {
80 .pv_major = OCFS2_LOCKING_PROTOCOL_MAJ 80 .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR,
81 .pv_minor = OCFS2_LOCKING_PROTOCOL_MIN 81 .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR,
82 }; 82 };
83 83
84 /* 84 /*
85 * decodes a set of open flags into a valid lo 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 86 * returns < 0 if we have invalid flags
87 * flags which mean something to us: 87 * flags which mean something to us:
88 * O_RDONLY -> PRMODE level 88 * O_RDONLY -> PRMODE level
89 * O_WRONLY -> EXMODE level 89 * O_WRONLY -> EXMODE level
90 * 90 *
91 * O_NONBLOCK -> LKM_NOQUEUE 91 * O_NONBLOCK -> LKM_NOQUEUE
92 */ 92 */
93 static int dlmfs_decode_open_flags(int open_fl 93 static int dlmfs_decode_open_flags(int open_flags,
94 int *level, 94 int *level,
95 int *flags) 95 int *flags)
96 { 96 {
97 if (open_flags & (O_WRONLY|O_RDWR)) 97 if (open_flags & (O_WRONLY|O_RDWR))
98 *level = LKM_EXMODE; 98 *level = LKM_EXMODE;
99 else 99 else
100 *level = LKM_PRMODE; 100 *level = LKM_PRMODE;
101 101
102 *flags = 0; 102 *flags = 0;
103 if (open_flags & O_NONBLOCK) 103 if (open_flags & O_NONBLOCK)
104 *flags |= LKM_NOQUEUE; 104 *flags |= LKM_NOQUEUE;
105 105
106 return 0; 106 return 0;
107 } 107 }
108 108
109 static int dlmfs_file_open(struct inode *inode 109 static int dlmfs_file_open(struct inode *inode,
110 struct file *file) 110 struct file *file)
111 { 111 {
112 int status, level, flags; 112 int status, level, flags;
113 struct dlmfs_filp_private *fp = NULL; 113 struct dlmfs_filp_private *fp = NULL;
114 struct dlmfs_inode_private *ip; 114 struct dlmfs_inode_private *ip;
115 115
116 if (S_ISDIR(inode->i_mode)) 116 if (S_ISDIR(inode->i_mode))
117 BUG(); 117 BUG();
118 118
119 mlog(0, "open called on inode %lu, fla 119 mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino,
120 file->f_flags); 120 file->f_flags);
121 121
122 status = dlmfs_decode_open_flags(file- 122 status = dlmfs_decode_open_flags(file->f_flags, &level, &flags);
123 if (status < 0) 123 if (status < 0)
124 goto bail; 124 goto bail;
125 125
126 /* We don't want to honor O_APPEND at 126 /* We don't want to honor O_APPEND at read/write time as it
127 * doesn't make sense for LVB writes. 127 * doesn't make sense for LVB writes. */
128 file->f_flags &= ~O_APPEND; 128 file->f_flags &= ~O_APPEND;
129 129
130 fp = kmalloc(sizeof(*fp), GFP_NOFS); 130 fp = kmalloc(sizeof(*fp), GFP_NOFS);
131 if (!fp) { 131 if (!fp) {
132 status = -ENOMEM; 132 status = -ENOMEM;
133 goto bail; 133 goto bail;
134 } 134 }
135 fp->fp_lock_level = level; 135 fp->fp_lock_level = level;
136 136
137 ip = DLMFS_I(inode); 137 ip = DLMFS_I(inode);
138 138
139 status = user_dlm_cluster_lock(&ip->ip 139 status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags);
140 if (status < 0) { 140 if (status < 0) {
141 /* this is a strange error to 141 /* this is a strange error to return here but I want
142 * to be able userspace to be 142 * to be able userspace to be able to distinguish a
143 * valid lock request from one 143 * valid lock request from one that simply couldn't be
144 * granted. */ 144 * granted. */
145 if (flags & LKM_NOQUEUE && sta 145 if (flags & LKM_NOQUEUE && status == -EAGAIN)
146 status = -ETXTBSY; 146 status = -ETXTBSY;
147 kfree(fp); 147 kfree(fp);
148 goto bail; 148 goto bail;
149 } 149 }
150 150
151 file->private_data = fp; 151 file->private_data = fp;
152 bail: 152 bail:
153 return status; 153 return status;
154 } 154 }
155 155
156 static int dlmfs_file_release(struct inode *in 156 static int dlmfs_file_release(struct inode *inode,
157 struct file *fil 157 struct file *file)
158 { 158 {
159 int level, status; 159 int level, status;
160 struct dlmfs_inode_private *ip = DLMFS 160 struct dlmfs_inode_private *ip = DLMFS_I(inode);
161 struct dlmfs_filp_private *fp = 161 struct dlmfs_filp_private *fp =
162 (struct dlmfs_filp_private *) 162 (struct dlmfs_filp_private *) file->private_data;
163 163
164 if (S_ISDIR(inode->i_mode)) 164 if (S_ISDIR(inode->i_mode))
165 BUG(); 165 BUG();
166 166
167 mlog(0, "close called on inode %lu\n", 167 mlog(0, "close called on inode %lu\n", inode->i_ino);
168 168
169 status = 0; 169 status = 0;
170 if (fp) { 170 if (fp) {
171 level = fp->fp_lock_level; 171 level = fp->fp_lock_level;
172 if (level != LKM_IVMODE) 172 if (level != LKM_IVMODE)
173 user_dlm_cluster_unloc 173 user_dlm_cluster_unlock(&ip->ip_lockres, level);
174 174
175 kfree(fp); 175 kfree(fp);
176 file->private_data = NULL; 176 file->private_data = NULL;
177 } 177 }
178 178
179 return 0; 179 return 0;
180 } 180 }
181 181
182 static ssize_t dlmfs_file_read(struct file *fi 182 static ssize_t dlmfs_file_read(struct file *filp,
183 char __user *bu 183 char __user *buf,
184 size_t count, 184 size_t count,
185 loff_t *ppos) 185 loff_t *ppos)
186 { 186 {
187 int bytes_left; 187 int bytes_left;
188 ssize_t readlen; 188 ssize_t readlen;
189 char *lvb_buf; 189 char *lvb_buf;
190 struct inode *inode = filp->f_path.den 190 struct inode *inode = filp->f_path.dentry->d_inode;
191 191
192 mlog(0, "inode %lu, count = %zu, *ppos 192 mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
193 inode->i_ino, count, *ppos); 193 inode->i_ino, count, *ppos);
194 194
195 if (*ppos >= i_size_read(inode)) 195 if (*ppos >= i_size_read(inode))
196 return 0; 196 return 0;
197 197
198 if (!count) 198 if (!count)
199 return 0; 199 return 0;
200 200
201 if (!access_ok(VERIFY_WRITE, buf, coun 201 if (!access_ok(VERIFY_WRITE, buf, count))
202 return -EFAULT; 202 return -EFAULT;
203 203
204 /* don't read past the lvb */ 204 /* don't read past the lvb */
205 if ((count + *ppos) > i_size_read(inod 205 if ((count + *ppos) > i_size_read(inode))
206 readlen = i_size_read(inode) - 206 readlen = i_size_read(inode) - *ppos;
207 else 207 else
208 readlen = count - *ppos; 208 readlen = count - *ppos;
209 209
210 lvb_buf = kmalloc(readlen, GFP_NOFS); 210 lvb_buf = kmalloc(readlen, GFP_NOFS);
211 if (!lvb_buf) 211 if (!lvb_buf)
212 return -ENOMEM; 212 return -ENOMEM;
213 213
214 user_dlm_read_lvb(inode, lvb_buf, read 214 user_dlm_read_lvb(inode, lvb_buf, readlen);
215 bytes_left = __copy_to_user(buf, lvb_b 215 bytes_left = __copy_to_user(buf, lvb_buf, readlen);
216 readlen -= bytes_left; 216 readlen -= bytes_left;
217 217
218 kfree(lvb_buf); 218 kfree(lvb_buf);
219 219
220 *ppos = *ppos + readlen; 220 *ppos = *ppos + readlen;
221 221
222 mlog(0, "read %zd bytes\n", readlen); 222 mlog(0, "read %zd bytes\n", readlen);
223 return readlen; 223 return readlen;
224 } 224 }
225 225
226 static ssize_t dlmfs_file_write(struct file *f 226 static ssize_t dlmfs_file_write(struct file *filp,
227 const char __u 227 const char __user *buf,
228 size_t count, 228 size_t count,
229 loff_t *ppos) 229 loff_t *ppos)
230 { 230 {
231 int bytes_left; 231 int bytes_left;
232 ssize_t writelen; 232 ssize_t writelen;
233 char *lvb_buf; 233 char *lvb_buf;
234 struct inode *inode = filp->f_path.den 234 struct inode *inode = filp->f_path.dentry->d_inode;
235 235
236 mlog(0, "inode %lu, count = %zu, *ppos 236 mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
237 inode->i_ino, count, *ppos); 237 inode->i_ino, count, *ppos);
238 238
239 if (*ppos >= i_size_read(inode)) 239 if (*ppos >= i_size_read(inode))
240 return -ENOSPC; 240 return -ENOSPC;
241 241
242 if (!count) 242 if (!count)
243 return 0; 243 return 0;
244 244
245 if (!access_ok(VERIFY_READ, buf, count 245 if (!access_ok(VERIFY_READ, buf, count))
246 return -EFAULT; 246 return -EFAULT;
247 247
248 /* don't write past the lvb */ 248 /* don't write past the lvb */
249 if ((count + *ppos) > i_size_read(inod 249 if ((count + *ppos) > i_size_read(inode))
250 writelen = i_size_read(inode) 250 writelen = i_size_read(inode) - *ppos;
251 else 251 else
252 writelen = count - *ppos; 252 writelen = count - *ppos;
253 253
254 lvb_buf = kmalloc(writelen, GFP_NOFS); 254 lvb_buf = kmalloc(writelen, GFP_NOFS);
255 if (!lvb_buf) 255 if (!lvb_buf)
256 return -ENOMEM; 256 return -ENOMEM;
257 257
258 bytes_left = copy_from_user(lvb_buf, b 258 bytes_left = copy_from_user(lvb_buf, buf, writelen);
259 writelen -= bytes_left; 259 writelen -= bytes_left;
260 if (writelen) 260 if (writelen)
261 user_dlm_write_lvb(inode, lvb_ 261 user_dlm_write_lvb(inode, lvb_buf, writelen);
262 262
263 kfree(lvb_buf); 263 kfree(lvb_buf);
264 264
265 *ppos = *ppos + writelen; 265 *ppos = *ppos + writelen;
266 mlog(0, "wrote %zd bytes\n", writelen) 266 mlog(0, "wrote %zd bytes\n", writelen);
267 return writelen; 267 return writelen;
268 } 268 }
269 269
270 static void dlmfs_init_once(struct kmem_cache 270 static void dlmfs_init_once(struct kmem_cache *cachep,
271 void *foo) 271 void *foo)
272 { 272 {
273 struct dlmfs_inode_private *ip = 273 struct dlmfs_inode_private *ip =
274 (struct dlmfs_inode_private *) 274 (struct dlmfs_inode_private *) foo;
275 275
276 ip->ip_dlm = NULL; 276 ip->ip_dlm = NULL;
277 ip->ip_parent = NULL; 277 ip->ip_parent = NULL;
278 278
279 inode_init_once(&ip->ip_vfs_inode); 279 inode_init_once(&ip->ip_vfs_inode);
280 } 280 }
281 281
282 static struct inode *dlmfs_alloc_inode(struct 282 static struct inode *dlmfs_alloc_inode(struct super_block *sb)
283 { 283 {
284 struct dlmfs_inode_private *ip; 284 struct dlmfs_inode_private *ip;
285 285
286 ip = kmem_cache_alloc(dlmfs_inode_cach 286 ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS);
287 if (!ip) 287 if (!ip)
288 return NULL; 288 return NULL;
289 289
290 return &ip->ip_vfs_inode; 290 return &ip->ip_vfs_inode;
291 } 291 }
292 292
293 static void dlmfs_destroy_inode(struct inode * 293 static void dlmfs_destroy_inode(struct inode *inode)
294 { 294 {
295 kmem_cache_free(dlmfs_inode_cache, DLM 295 kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode));
296 } 296 }
297 297
298 static void dlmfs_clear_inode(struct inode *in 298 static void dlmfs_clear_inode(struct inode *inode)
299 { 299 {
300 int status; 300 int status;
301 struct dlmfs_inode_private *ip; 301 struct dlmfs_inode_private *ip;
302 302
303 if (!inode) 303 if (!inode)
304 return; 304 return;
305 305
306 mlog(0, "inode %lu\n", inode->i_ino); 306 mlog(0, "inode %lu\n", inode->i_ino);
307 307
308 ip = DLMFS_I(inode); 308 ip = DLMFS_I(inode);
309 309
310 if (S_ISREG(inode->i_mode)) { 310 if (S_ISREG(inode->i_mode)) {
311 status = user_dlm_destroy_lock 311 status = user_dlm_destroy_lock(&ip->ip_lockres);
312 if (status < 0) 312 if (status < 0)
313 mlog_errno(status); 313 mlog_errno(status);
314 iput(ip->ip_parent); 314 iput(ip->ip_parent);
315 goto clear_fields; 315 goto clear_fields;
316 } 316 }
317 317
318 mlog(0, "we're a directory, ip->ip_dlm 318 mlog(0, "we're a directory, ip->ip_dlm = 0x%p\n", ip->ip_dlm);
319 /* we must be a directory. If required 319 /* we must be a directory. If required, lets unregister the
320 * dlm context now. */ 320 * dlm context now. */
321 if (ip->ip_dlm) 321 if (ip->ip_dlm)
322 user_dlm_unregister_context(ip 322 user_dlm_unregister_context(ip->ip_dlm);
323 clear_fields: 323 clear_fields:
324 ip->ip_parent = NULL; 324 ip->ip_parent = NULL;
325 ip->ip_dlm = NULL; 325 ip->ip_dlm = NULL;
326 } 326 }
327 327
328 static struct backing_dev_info dlmfs_backing_d 328 static struct backing_dev_info dlmfs_backing_dev_info = {
329 .ra_pages = 0, /* No readahea 329 .ra_pages = 0, /* No readahead */
330 .capabilities = BDI_CAP_NO_ACCT_DIRT 330 .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
331 }; 331 };
332 332
333 static struct inode *dlmfs_get_root_inode(stru 333 static struct inode *dlmfs_get_root_inode(struct super_block *sb)
334 { 334 {
335 struct inode *inode = new_inode(sb); 335 struct inode *inode = new_inode(sb);
336 int mode = S_IFDIR | 0755; 336 int mode = S_IFDIR | 0755;
337 struct dlmfs_inode_private *ip; 337 struct dlmfs_inode_private *ip;
338 338
339 if (inode) { 339 if (inode) {
340 ip = DLMFS_I(inode); 340 ip = DLMFS_I(inode);
341 341
342 inode->i_mode = mode; 342 inode->i_mode = mode;
343 inode->i_uid = current->fsuid; 343 inode->i_uid = current->fsuid;
344 inode->i_gid = current->fsgid; 344 inode->i_gid = current->fsgid;
345 inode->i_blocks = 0; 345 inode->i_blocks = 0;
346 inode->i_mapping->backing_dev_ 346 inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
347 inode->i_atime = inode->i_mtim 347 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
348 inc_nlink(inode); 348 inc_nlink(inode);
349 349
350 inode->i_fop = &simple_dir_ope 350 inode->i_fop = &simple_dir_operations;
351 inode->i_op = &dlmfs_root_inod 351 inode->i_op = &dlmfs_root_inode_operations;
352 } 352 }
353 353
354 return inode; 354 return inode;
355 } 355 }
356 356
357 static struct inode *dlmfs_get_inode(struct in 357 static struct inode *dlmfs_get_inode(struct inode *parent,
358 struct de 358 struct dentry *dentry,
359 int mode) 359 int mode)
360 { 360 {
361 struct super_block *sb = parent->i_sb; 361 struct super_block *sb = parent->i_sb;
362 struct inode * inode = new_inode(sb); 362 struct inode * inode = new_inode(sb);
363 struct dlmfs_inode_private *ip; 363 struct dlmfs_inode_private *ip;
364 364
365 if (!inode) 365 if (!inode)
366 return NULL; 366 return NULL;
367 367
368 inode->i_mode = mode; 368 inode->i_mode = mode;
369 inode->i_uid = current->fsuid; 369 inode->i_uid = current->fsuid;
370 inode->i_gid = current->fsgid; 370 inode->i_gid = current->fsgid;
371 inode->i_blocks = 0; 371 inode->i_blocks = 0;
372 inode->i_mapping->backing_dev_info = & 372 inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
373 inode->i_atime = inode->i_mtime = inod 373 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
374 374
375 ip = DLMFS_I(inode); 375 ip = DLMFS_I(inode);
376 ip->ip_dlm = DLMFS_I(parent)->ip_dlm; 376 ip->ip_dlm = DLMFS_I(parent)->ip_dlm;
377 377
378 switch (mode & S_IFMT) { 378 switch (mode & S_IFMT) {
379 default: 379 default:
380 /* for now we don't support an 380 /* for now we don't support anything other than
381 * directories and regular fil 381 * directories and regular files. */
382 BUG(); 382 BUG();
383 break; 383 break;
384 case S_IFREG: 384 case S_IFREG:
385 inode->i_op = &dlmfs_file_inod 385 inode->i_op = &dlmfs_file_inode_operations;
386 inode->i_fop = &dlmfs_file_ope 386 inode->i_fop = &dlmfs_file_operations;
387 387
388 i_size_write(inode, DLM_LVB_L 388 i_size_write(inode, DLM_LVB_LEN);
389 389
390 user_dlm_lock_res_init(&ip->ip 390 user_dlm_lock_res_init(&ip->ip_lockres, dentry);
391 391
392 /* released at clear_inode tim 392 /* released at clear_inode time, this insures that we
393 * get to drop the dlm referen 393 * get to drop the dlm reference on each lock *before*
394 * we call the unregister code 394 * we call the unregister code for releasing parent
395 * directories. */ 395 * directories. */
396 ip->ip_parent = igrab(parent); 396 ip->ip_parent = igrab(parent);
397 BUG_ON(!ip->ip_parent); 397 BUG_ON(!ip->ip_parent);
398 break; 398 break;
399 case S_IFDIR: 399 case S_IFDIR:
400 inode->i_op = &dlmfs_dir_inode 400 inode->i_op = &dlmfs_dir_inode_operations;
401 inode->i_fop = &simple_dir_ope 401 inode->i_fop = &simple_dir_operations;
402 402
403 /* directory inodes start off 403 /* directory inodes start off with i_nlink ==
404 * 2 (for "." entry) */ 404 * 2 (for "." entry) */
405 inc_nlink(inode); 405 inc_nlink(inode);
406 break; 406 break;
407 } 407 }
408 408
409 if (parent->i_mode & S_ISGID) { 409 if (parent->i_mode & S_ISGID) {
410 inode->i_gid = parent->i_gid; 410 inode->i_gid = parent->i_gid;
411 if (S_ISDIR(mode)) 411 if (S_ISDIR(mode))
412 inode->i_mode |= S_ISG 412 inode->i_mode |= S_ISGID;
413 } 413 }
414 414
415 return inode; 415 return inode;
416 } 416 }
417 417
418 /* 418 /*
419 * File creation. Allocate an inode, and we're 419 * File creation. Allocate an inode, and we're done..
420 */ 420 */
421 /* SMP-safe */ 421 /* SMP-safe */
422 static int dlmfs_mkdir(struct inode * dir, 422 static int dlmfs_mkdir(struct inode * dir,
423 struct dentry * dentry, 423 struct dentry * dentry,
424 int mode) 424 int mode)
425 { 425 {
426 int status; 426 int status;
427 struct inode *inode = NULL; 427 struct inode *inode = NULL;
428 struct qstr *domain = &dentry->d_name; 428 struct qstr *domain = &dentry->d_name;
429 struct dlmfs_inode_private *ip; 429 struct dlmfs_inode_private *ip;
430 struct dlm_ctxt *dlm; 430 struct dlm_ctxt *dlm;
431 struct dlm_protocol_version proto = us 431 struct dlm_protocol_version proto = user_locking_protocol;
432 432
433 mlog(0, "mkdir %.*s\n", domain->len, d 433 mlog(0, "mkdir %.*s\n", domain->len, domain->name);
434 434
435 /* verify that we have a proper domain 435 /* verify that we have a proper domain */
436 if (domain->len >= O2NM_MAX_NAME_LEN) 436 if (domain->len >= O2NM_MAX_NAME_LEN) {
437 status = -EINVAL; 437 status = -EINVAL;
438 mlog(ML_ERROR, "invalid domain 438 mlog(ML_ERROR, "invalid domain name for directory.\n");
439 goto bail; 439 goto bail;
440 } 440 }
441 441
442 inode = dlmfs_get_inode(dir, dentry, m 442 inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR);
443 if (!inode) { 443 if (!inode) {
444 status = -ENOMEM; 444 status = -ENOMEM;
445 mlog_errno(status); 445 mlog_errno(status);
446 goto bail; 446 goto bail;
447 } 447 }
448 448
449 ip = DLMFS_I(inode); 449 ip = DLMFS_I(inode);
450 450
451 dlm = user_dlm_register_context(domain 451 dlm = user_dlm_register_context(domain, &proto);
452 if (IS_ERR(dlm)) { 452 if (IS_ERR(dlm)) {
453 status = PTR_ERR(dlm); 453 status = PTR_ERR(dlm);
454 mlog(ML_ERROR, "Error %d could 454 mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n",
455 status, domain->len, doma 455 status, domain->len, domain->name);
456 goto bail; 456 goto bail;
457 } 457 }
458 ip->ip_dlm = dlm; 458 ip->ip_dlm = dlm;
459 459
460 inc_nlink(dir); 460 inc_nlink(dir);
461 d_instantiate(dentry, inode); 461 d_instantiate(dentry, inode);
462 dget(dentry); /* Extra count - pin t 462 dget(dentry); /* Extra count - pin the dentry in core */
463 463
464 status = 0; 464 status = 0;
465 bail: 465 bail:
466 if (status < 0) 466 if (status < 0)
467 iput(inode); 467 iput(inode);
468 return status; 468 return status;
469 } 469 }
470 470
471 static int dlmfs_create(struct inode *dir, 471 static int dlmfs_create(struct inode *dir,
472 struct dentry *dentry, 472 struct dentry *dentry,
473 int mode, 473 int mode,
474 struct nameidata *nd) 474 struct nameidata *nd)
475 { 475 {
476 int status = 0; 476 int status = 0;
477 struct inode *inode; 477 struct inode *inode;
478 struct qstr *name = &dentry->d_name; 478 struct qstr *name = &dentry->d_name;
479 479
480 mlog(0, "create %.*s\n", name->len, na 480 mlog(0, "create %.*s\n", name->len, name->name);
481 481
482 /* verify name is valid and doesn't co 482 /* verify name is valid and doesn't contain any dlm reserved
483 * characters */ 483 * characters */
484 if (name->len >= USER_DLM_LOCK_ID_MAX_ 484 if (name->len >= USER_DLM_LOCK_ID_MAX_LEN ||
485 name->name[0] == '$') { 485 name->name[0] == '$') {
486 status = -EINVAL; 486 status = -EINVAL;
487 mlog(ML_ERROR, "invalid lock n 487 mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len,
488 name->name); 488 name->name);
489 goto bail; 489 goto bail;
490 } 490 }
491 491
492 inode = dlmfs_get_inode(dir, dentry, m 492 inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG);
493 if (!inode) { 493 if (!inode) {
494 status = -ENOMEM; 494 status = -ENOMEM;
495 mlog_errno(status); 495 mlog_errno(status);
496 goto bail; 496 goto bail;
497 } 497 }
498 498
499 d_instantiate(dentry, inode); 499 d_instantiate(dentry, inode);
500 dget(dentry); /* Extra count - pin t 500 dget(dentry); /* Extra count - pin the dentry in core */
501 bail: 501 bail:
502 return status; 502 return status;
503 } 503 }
504 504
505 static int dlmfs_unlink(struct inode *dir, 505 static int dlmfs_unlink(struct inode *dir,
506 struct dentry *dentry) 506 struct dentry *dentry)
507 { 507 {
508 int status; 508 int status;
509 struct inode *inode = dentry->d_inode; 509 struct inode *inode = dentry->d_inode;
510 510
511 mlog(0, "unlink inode %lu\n", inode->i 511 mlog(0, "unlink inode %lu\n", inode->i_ino);
512 512
513 /* if there are no current holders, or 513 /* if there are no current holders, or none that are waiting
514 * to acquire a lock, this basically d 514 * to acquire a lock, this basically destroys our lockres. */
515 status = user_dlm_destroy_lock(&DLMFS_ 515 status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres);
516 if (status < 0) { 516 if (status < 0) {
517 mlog(ML_ERROR, "unlink %.*s, e 517 mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n",
518 dentry->d_name.len, dentr 518 dentry->d_name.len, dentry->d_name.name, status);
519 goto bail; 519 goto bail;
520 } 520 }
521 status = simple_unlink(dir, dentry); 521 status = simple_unlink(dir, dentry);
522 bail: 522 bail:
523 return status; 523 return status;
524 } 524 }
525 525
526 static int dlmfs_fill_super(struct super_block 526 static int dlmfs_fill_super(struct super_block * sb,
527 void * data, 527 void * data,
528 int silent) 528 int silent)
529 { 529 {
530 struct inode * inode; 530 struct inode * inode;
531 struct dentry * root; 531 struct dentry * root;
532 532
533 sb->s_maxbytes = MAX_LFS_FILESIZE; 533 sb->s_maxbytes = MAX_LFS_FILESIZE;
534 sb->s_blocksize = PAGE_CACHE_SIZE; 534 sb->s_blocksize = PAGE_CACHE_SIZE;
535 sb->s_blocksize_bits = PAGE_CACHE_SHIF 535 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
536 sb->s_magic = DLMFS_MAGIC; 536 sb->s_magic = DLMFS_MAGIC;
537 sb->s_op = &dlmfs_ops; 537 sb->s_op = &dlmfs_ops;
538 inode = dlmfs_get_root_inode(sb); 538 inode = dlmfs_get_root_inode(sb);
539 if (!inode) 539 if (!inode)
540 return -ENOMEM; 540 return -ENOMEM;
541 541
542 root = d_alloc_root(inode); 542 root = d_alloc_root(inode);
543 if (!root) { 543 if (!root) {
544 iput(inode); 544 iput(inode);
545 return -ENOMEM; 545 return -ENOMEM;
546 } 546 }
547 sb->s_root = root; 547 sb->s_root = root;
548 return 0; 548 return 0;
549 } 549 }
550 550
551 static const struct file_operations dlmfs_file 551 static const struct file_operations dlmfs_file_operations = {
552 .open = dlmfs_file_open, 552 .open = dlmfs_file_open,
553 .release = dlmfs_file_release, 553 .release = dlmfs_file_release,
554 .read = dlmfs_file_read, 554 .read = dlmfs_file_read,
555 .write = dlmfs_file_write, 555 .write = dlmfs_file_write,
556 }; 556 };
557 557
558 static const struct inode_operations dlmfs_dir 558 static const struct inode_operations dlmfs_dir_inode_operations = {
559 .create = dlmfs_create, 559 .create = dlmfs_create,
560 .lookup = simple_lookup, 560 .lookup = simple_lookup,
561 .unlink = dlmfs_unlink, 561 .unlink = dlmfs_unlink,
562 }; 562 };
563 563
564 /* this way we can restrict mkdir to only the 564 /* this way we can restrict mkdir to only the toplevel of the fs. */
565 static const struct inode_operations dlmfs_roo 565 static const struct inode_operations dlmfs_root_inode_operations = {
566 .lookup = simple_lookup, 566 .lookup = simple_lookup,
567 .mkdir = dlmfs_mkdir, 567 .mkdir = dlmfs_mkdir,
568 .rmdir = simple_rmdir, 568 .rmdir = simple_rmdir,
569 }; 569 };
570 570
571 static const struct super_operations dlmfs_ops 571 static const struct super_operations dlmfs_ops = {
572 .statfs = simple_statfs, 572 .statfs = simple_statfs,
573 .alloc_inode = dlmfs_alloc_inode, 573 .alloc_inode = dlmfs_alloc_inode,
574 .destroy_inode = dlmfs_destroy_inode, 574 .destroy_inode = dlmfs_destroy_inode,
575 .clear_inode = dlmfs_clear_inode, 575 .clear_inode = dlmfs_clear_inode,
576 .drop_inode = generic_delete_inode 576 .drop_inode = generic_delete_inode,
577 }; 577 };
578 578
579 static const struct inode_operations dlmfs_fil 579 static const struct inode_operations dlmfs_file_inode_operations = {
580 .getattr = simple_getattr, 580 .getattr = simple_getattr,
581 }; 581 };
582 582
583 static int dlmfs_get_sb(struct file_system_typ 583 static int dlmfs_get_sb(struct file_system_type *fs_type,
584 int flags, const char *dev_name, void 584 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
585 { 585 {
586 return get_sb_nodev(fs_type, flags, da 586 return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt);
587 } 587 }
588 588
589 static struct file_system_type dlmfs_fs_type = 589 static struct file_system_type dlmfs_fs_type = {
590 .owner = THIS_MODULE, 590 .owner = THIS_MODULE,
591 .name = "ocfs2_dlmfs", 591 .name = "ocfs2_dlmfs",
592 .get_sb = dlmfs_get_sb, 592 .get_sb = dlmfs_get_sb,
593 .kill_sb = kill_litter_super, 593 .kill_sb = kill_litter_super,
594 }; 594 };
595 595
596 static int __init init_dlmfs_fs(void) 596 static int __init init_dlmfs_fs(void)
597 { 597 {
598 int status; 598 int status;
599 int cleanup_inode = 0, cleanup_worker 599 int cleanup_inode = 0, cleanup_worker = 0;
600 600
601 dlmfs_print_version(); 601 dlmfs_print_version();
602 602
603 status = bdi_init(&dlmfs_backing_dev_i 603 status = bdi_init(&dlmfs_backing_dev_info);
604 if (status) 604 if (status)
605 return status; 605 return status;
606 606
607 dlmfs_inode_cache = kmem_cache_create( 607 dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache",
608 sizeof(struct 608 sizeof(struct dlmfs_inode_private),
609 0, (SLAB_HWCAC 609 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
610 SLAB_M 610 SLAB_MEM_SPREAD),
611 dlmfs_init_onc 611 dlmfs_init_once);
612 if (!dlmfs_inode_cache) 612 if (!dlmfs_inode_cache)
613 goto bail; 613 goto bail;
614 cleanup_inode = 1; 614 cleanup_inode = 1;
615 615
616 user_dlm_worker = create_singlethread_ 616 user_dlm_worker = create_singlethread_workqueue("user_dlm");
617 if (!user_dlm_worker) { 617 if (!user_dlm_worker) {
618 status = -ENOMEM; 618 status = -ENOMEM;
619 goto bail; 619 goto bail;
620 } 620 }
621 cleanup_worker = 1; 621 cleanup_worker = 1;
622 622
623 status = register_filesystem(&dlmfs_fs 623 status = register_filesystem(&dlmfs_fs_type);
624 bail: 624 bail:
625 if (status) { 625 if (status) {
626 if (cleanup_inode) 626 if (cleanup_inode)
627 kmem_cache_destroy(dlm 627 kmem_cache_destroy(dlmfs_inode_cache);
628 if (cleanup_worker) 628 if (cleanup_worker)
629 destroy_workqueue(user 629 destroy_workqueue(user_dlm_worker);
630 bdi_destroy(&dlmfs_backing_dev 630 bdi_destroy(&dlmfs_backing_dev_info);
631 } else 631 } else
632 printk("OCFS2 User DLM kernel 632 printk("OCFS2 User DLM kernel interface loaded\n");
633 return status; 633 return status;
634 } 634 }
635 635
636 static void __exit exit_dlmfs_fs(void) 636 static void __exit exit_dlmfs_fs(void)
637 { 637 {
638 unregister_filesystem(&dlmfs_fs_type); 638 unregister_filesystem(&dlmfs_fs_type);
639 639
640 flush_workqueue(user_dlm_worker); 640 flush_workqueue(user_dlm_worker);
641 destroy_workqueue(user_dlm_worker); 641 destroy_workqueue(user_dlm_worker);
642 642
643 kmem_cache_destroy(dlmfs_inode_cache); 643 kmem_cache_destroy(dlmfs_inode_cache);
644 644
645 bdi_destroy(&dlmfs_backing_dev_info); 645 bdi_destroy(&dlmfs_backing_dev_info);
646 } 646 }
647 647
648 MODULE_AUTHOR("Oracle"); 648 MODULE_AUTHOR("Oracle");
649 MODULE_LICENSE("GPL"); 649 MODULE_LICENSE("GPL");
650 650
651 module_init(init_dlmfs_fs) 651 module_init(init_dlmfs_fs)
652 module_exit(exit_dlmfs_fs) 652 module_exit(exit_dlmfs_fs)
653 653
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