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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(void *foo)
271 void *foo) <<
272 { 271 {
273 struct dlmfs_inode_private *ip = 272 struct dlmfs_inode_private *ip =
274 (struct dlmfs_inode_private *) 273 (struct dlmfs_inode_private *) foo;
275 274
276 ip->ip_dlm = NULL; 275 ip->ip_dlm = NULL;
277 ip->ip_parent = NULL; 276 ip->ip_parent = NULL;
278 277
279 inode_init_once(&ip->ip_vfs_inode); 278 inode_init_once(&ip->ip_vfs_inode);
280 } 279 }
281 280
282 static struct inode *dlmfs_alloc_inode(struct 281 static struct inode *dlmfs_alloc_inode(struct super_block *sb)
283 { 282 {
284 struct dlmfs_inode_private *ip; 283 struct dlmfs_inode_private *ip;
285 284
286 ip = kmem_cache_alloc(dlmfs_inode_cach 285 ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS);
287 if (!ip) 286 if (!ip)
288 return NULL; 287 return NULL;
289 288
290 return &ip->ip_vfs_inode; 289 return &ip->ip_vfs_inode;
291 } 290 }
292 291
293 static void dlmfs_destroy_inode(struct inode * 292 static void dlmfs_destroy_inode(struct inode *inode)
294 { 293 {
295 kmem_cache_free(dlmfs_inode_cache, DLM 294 kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode));
296 } 295 }
297 296
298 static void dlmfs_clear_inode(struct inode *in 297 static void dlmfs_clear_inode(struct inode *inode)
299 { 298 {
300 int status; 299 int status;
301 struct dlmfs_inode_private *ip; 300 struct dlmfs_inode_private *ip;
302 301
303 if (!inode) 302 if (!inode)
304 return; 303 return;
305 304
306 mlog(0, "inode %lu\n", inode->i_ino); 305 mlog(0, "inode %lu\n", inode->i_ino);
307 306
308 ip = DLMFS_I(inode); 307 ip = DLMFS_I(inode);
309 308
310 if (S_ISREG(inode->i_mode)) { 309 if (S_ISREG(inode->i_mode)) {
311 status = user_dlm_destroy_lock 310 status = user_dlm_destroy_lock(&ip->ip_lockres);
312 if (status < 0) 311 if (status < 0)
313 mlog_errno(status); 312 mlog_errno(status);
314 iput(ip->ip_parent); 313 iput(ip->ip_parent);
315 goto clear_fields; 314 goto clear_fields;
316 } 315 }
317 316
318 mlog(0, "we're a directory, ip->ip_dlm 317 mlog(0, "we're a directory, ip->ip_dlm = 0x%p\n", ip->ip_dlm);
319 /* we must be a directory. If required 318 /* we must be a directory. If required, lets unregister the
320 * dlm context now. */ 319 * dlm context now. */
321 if (ip->ip_dlm) 320 if (ip->ip_dlm)
322 user_dlm_unregister_context(ip 321 user_dlm_unregister_context(ip->ip_dlm);
323 clear_fields: 322 clear_fields:
324 ip->ip_parent = NULL; 323 ip->ip_parent = NULL;
325 ip->ip_dlm = NULL; 324 ip->ip_dlm = NULL;
326 } 325 }
327 326
328 static struct backing_dev_info dlmfs_backing_d 327 static struct backing_dev_info dlmfs_backing_dev_info = {
329 .ra_pages = 0, /* No readahea 328 .ra_pages = 0, /* No readahead */
330 .capabilities = BDI_CAP_NO_ACCT_DIRT !! 329 .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
331 }; 330 };
332 331
333 static struct inode *dlmfs_get_root_inode(stru 332 static struct inode *dlmfs_get_root_inode(struct super_block *sb)
334 { 333 {
335 struct inode *inode = new_inode(sb); 334 struct inode *inode = new_inode(sb);
336 int mode = S_IFDIR | 0755; 335 int mode = S_IFDIR | 0755;
337 struct dlmfs_inode_private *ip; 336 struct dlmfs_inode_private *ip;
338 337
339 if (inode) { 338 if (inode) {
340 ip = DLMFS_I(inode); 339 ip = DLMFS_I(inode);
341 340
342 inode->i_mode = mode; 341 inode->i_mode = mode;
343 inode->i_uid = current->fsuid; !! 342 inode->i_uid = current_fsuid();
344 inode->i_gid = current->fsgid; !! 343 inode->i_gid = current_fsgid();
345 inode->i_blocks = 0; <<
346 inode->i_mapping->backing_dev_ 344 inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
347 inode->i_atime = inode->i_mtim 345 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
348 inc_nlink(inode); 346 inc_nlink(inode);
349 347
350 inode->i_fop = &simple_dir_ope 348 inode->i_fop = &simple_dir_operations;
351 inode->i_op = &dlmfs_root_inod 349 inode->i_op = &dlmfs_root_inode_operations;
352 } 350 }
353 351
354 return inode; 352 return inode;
355 } 353 }
356 354
357 static struct inode *dlmfs_get_inode(struct in 355 static struct inode *dlmfs_get_inode(struct inode *parent,
358 struct de 356 struct dentry *dentry,
359 int mode) 357 int mode)
360 { 358 {
361 struct super_block *sb = parent->i_sb; 359 struct super_block *sb = parent->i_sb;
362 struct inode * inode = new_inode(sb); 360 struct inode * inode = new_inode(sb);
363 struct dlmfs_inode_private *ip; 361 struct dlmfs_inode_private *ip;
364 362
365 if (!inode) 363 if (!inode)
366 return NULL; 364 return NULL;
367 365
368 inode->i_mode = mode; 366 inode->i_mode = mode;
369 inode->i_uid = current->fsuid; !! 367 inode->i_uid = current_fsuid();
370 inode->i_gid = current->fsgid; !! 368 inode->i_gid = current_fsgid();
371 inode->i_blocks = 0; <<
372 inode->i_mapping->backing_dev_info = & 369 inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
373 inode->i_atime = inode->i_mtime = inod 370 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
374 371
375 ip = DLMFS_I(inode); 372 ip = DLMFS_I(inode);
376 ip->ip_dlm = DLMFS_I(parent)->ip_dlm; 373 ip->ip_dlm = DLMFS_I(parent)->ip_dlm;
377 374
378 switch (mode & S_IFMT) { 375 switch (mode & S_IFMT) {
379 default: 376 default:
380 /* for now we don't support an 377 /* for now we don't support anything other than
381 * directories and regular fil 378 * directories and regular files. */
382 BUG(); 379 BUG();
383 break; 380 break;
384 case S_IFREG: 381 case S_IFREG:
385 inode->i_op = &dlmfs_file_inod 382 inode->i_op = &dlmfs_file_inode_operations;
386 inode->i_fop = &dlmfs_file_ope 383 inode->i_fop = &dlmfs_file_operations;
387 384
388 i_size_write(inode, DLM_LVB_L 385 i_size_write(inode, DLM_LVB_LEN);
389 386
390 user_dlm_lock_res_init(&ip->ip 387 user_dlm_lock_res_init(&ip->ip_lockres, dentry);
391 388
392 /* released at clear_inode tim 389 /* released at clear_inode time, this insures that we
393 * get to drop the dlm referen 390 * get to drop the dlm reference on each lock *before*
394 * we call the unregister code 391 * we call the unregister code for releasing parent
395 * directories. */ 392 * directories. */
396 ip->ip_parent = igrab(parent); 393 ip->ip_parent = igrab(parent);
397 BUG_ON(!ip->ip_parent); 394 BUG_ON(!ip->ip_parent);
398 break; 395 break;
399 case S_IFDIR: 396 case S_IFDIR:
400 inode->i_op = &dlmfs_dir_inode 397 inode->i_op = &dlmfs_dir_inode_operations;
401 inode->i_fop = &simple_dir_ope 398 inode->i_fop = &simple_dir_operations;
402 399
403 /* directory inodes start off 400 /* directory inodes start off with i_nlink ==
404 * 2 (for "." entry) */ 401 * 2 (for "." entry) */
405 inc_nlink(inode); 402 inc_nlink(inode);
406 break; 403 break;
407 } 404 }
408 405
409 if (parent->i_mode & S_ISGID) { 406 if (parent->i_mode & S_ISGID) {
410 inode->i_gid = parent->i_gid; 407 inode->i_gid = parent->i_gid;
411 if (S_ISDIR(mode)) 408 if (S_ISDIR(mode))
412 inode->i_mode |= S_ISG 409 inode->i_mode |= S_ISGID;
413 } 410 }
414 411
415 return inode; 412 return inode;
416 } 413 }
417 414
418 /* 415 /*
419 * File creation. Allocate an inode, and we're 416 * File creation. Allocate an inode, and we're done..
420 */ 417 */
421 /* SMP-safe */ 418 /* SMP-safe */
422 static int dlmfs_mkdir(struct inode * dir, 419 static int dlmfs_mkdir(struct inode * dir,
423 struct dentry * dentry, 420 struct dentry * dentry,
424 int mode) 421 int mode)
425 { 422 {
426 int status; 423 int status;
427 struct inode *inode = NULL; 424 struct inode *inode = NULL;
428 struct qstr *domain = &dentry->d_name; 425 struct qstr *domain = &dentry->d_name;
429 struct dlmfs_inode_private *ip; 426 struct dlmfs_inode_private *ip;
430 struct dlm_ctxt *dlm; 427 struct dlm_ctxt *dlm;
431 struct dlm_protocol_version proto = us 428 struct dlm_protocol_version proto = user_locking_protocol;
432 429
433 mlog(0, "mkdir %.*s\n", domain->len, d 430 mlog(0, "mkdir %.*s\n", domain->len, domain->name);
434 431
435 /* verify that we have a proper domain 432 /* verify that we have a proper domain */
436 if (domain->len >= O2NM_MAX_NAME_LEN) 433 if (domain->len >= O2NM_MAX_NAME_LEN) {
437 status = -EINVAL; 434 status = -EINVAL;
438 mlog(ML_ERROR, "invalid domain 435 mlog(ML_ERROR, "invalid domain name for directory.\n");
439 goto bail; 436 goto bail;
440 } 437 }
441 438
442 inode = dlmfs_get_inode(dir, dentry, m 439 inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR);
443 if (!inode) { 440 if (!inode) {
444 status = -ENOMEM; 441 status = -ENOMEM;
445 mlog_errno(status); 442 mlog_errno(status);
446 goto bail; 443 goto bail;
447 } 444 }
448 445
449 ip = DLMFS_I(inode); 446 ip = DLMFS_I(inode);
450 447
451 dlm = user_dlm_register_context(domain 448 dlm = user_dlm_register_context(domain, &proto);
452 if (IS_ERR(dlm)) { 449 if (IS_ERR(dlm)) {
453 status = PTR_ERR(dlm); 450 status = PTR_ERR(dlm);
454 mlog(ML_ERROR, "Error %d could 451 mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n",
455 status, domain->len, doma 452 status, domain->len, domain->name);
456 goto bail; 453 goto bail;
457 } 454 }
458 ip->ip_dlm = dlm; 455 ip->ip_dlm = dlm;
459 456
460 inc_nlink(dir); 457 inc_nlink(dir);
461 d_instantiate(dentry, inode); 458 d_instantiate(dentry, inode);
462 dget(dentry); /* Extra count - pin t 459 dget(dentry); /* Extra count - pin the dentry in core */
463 460
464 status = 0; 461 status = 0;
465 bail: 462 bail:
466 if (status < 0) 463 if (status < 0)
467 iput(inode); 464 iput(inode);
468 return status; 465 return status;
469 } 466 }
470 467
471 static int dlmfs_create(struct inode *dir, 468 static int dlmfs_create(struct inode *dir,
472 struct dentry *dentry, 469 struct dentry *dentry,
473 int mode, 470 int mode,
474 struct nameidata *nd) 471 struct nameidata *nd)
475 { 472 {
476 int status = 0; 473 int status = 0;
477 struct inode *inode; 474 struct inode *inode;
478 struct qstr *name = &dentry->d_name; 475 struct qstr *name = &dentry->d_name;
479 476
480 mlog(0, "create %.*s\n", name->len, na 477 mlog(0, "create %.*s\n", name->len, name->name);
481 478
482 /* verify name is valid and doesn't co 479 /* verify name is valid and doesn't contain any dlm reserved
483 * characters */ 480 * characters */
484 if (name->len >= USER_DLM_LOCK_ID_MAX_ 481 if (name->len >= USER_DLM_LOCK_ID_MAX_LEN ||
485 name->name[0] == '$') { 482 name->name[0] == '$') {
486 status = -EINVAL; 483 status = -EINVAL;
487 mlog(ML_ERROR, "invalid lock n 484 mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len,
488 name->name); 485 name->name);
489 goto bail; 486 goto bail;
490 } 487 }
491 488
492 inode = dlmfs_get_inode(dir, dentry, m 489 inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG);
493 if (!inode) { 490 if (!inode) {
494 status = -ENOMEM; 491 status = -ENOMEM;
495 mlog_errno(status); 492 mlog_errno(status);
496 goto bail; 493 goto bail;
497 } 494 }
498 495
499 d_instantiate(dentry, inode); 496 d_instantiate(dentry, inode);
500 dget(dentry); /* Extra count - pin t 497 dget(dentry); /* Extra count - pin the dentry in core */
501 bail: 498 bail:
502 return status; 499 return status;
503 } 500 }
504 501
505 static int dlmfs_unlink(struct inode *dir, 502 static int dlmfs_unlink(struct inode *dir,
506 struct dentry *dentry) 503 struct dentry *dentry)
507 { 504 {
508 int status; 505 int status;
509 struct inode *inode = dentry->d_inode; 506 struct inode *inode = dentry->d_inode;
510 507
511 mlog(0, "unlink inode %lu\n", inode->i 508 mlog(0, "unlink inode %lu\n", inode->i_ino);
512 509
513 /* if there are no current holders, or 510 /* if there are no current holders, or none that are waiting
514 * to acquire a lock, this basically d 511 * to acquire a lock, this basically destroys our lockres. */
515 status = user_dlm_destroy_lock(&DLMFS_ 512 status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres);
516 if (status < 0) { 513 if (status < 0) {
517 mlog(ML_ERROR, "unlink %.*s, e 514 mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n",
518 dentry->d_name.len, dentr 515 dentry->d_name.len, dentry->d_name.name, status);
519 goto bail; 516 goto bail;
520 } 517 }
521 status = simple_unlink(dir, dentry); 518 status = simple_unlink(dir, dentry);
522 bail: 519 bail:
523 return status; 520 return status;
524 } 521 }
525 522
526 static int dlmfs_fill_super(struct super_block 523 static int dlmfs_fill_super(struct super_block * sb,
527 void * data, 524 void * data,
528 int silent) 525 int silent)
529 { 526 {
530 struct inode * inode; 527 struct inode * inode;
531 struct dentry * root; 528 struct dentry * root;
532 529
533 sb->s_maxbytes = MAX_LFS_FILESIZE; 530 sb->s_maxbytes = MAX_LFS_FILESIZE;
534 sb->s_blocksize = PAGE_CACHE_SIZE; 531 sb->s_blocksize = PAGE_CACHE_SIZE;
535 sb->s_blocksize_bits = PAGE_CACHE_SHIF 532 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
536 sb->s_magic = DLMFS_MAGIC; 533 sb->s_magic = DLMFS_MAGIC;
537 sb->s_op = &dlmfs_ops; 534 sb->s_op = &dlmfs_ops;
538 inode = dlmfs_get_root_inode(sb); 535 inode = dlmfs_get_root_inode(sb);
539 if (!inode) 536 if (!inode)
540 return -ENOMEM; 537 return -ENOMEM;
541 538
542 root = d_alloc_root(inode); 539 root = d_alloc_root(inode);
543 if (!root) { 540 if (!root) {
544 iput(inode); 541 iput(inode);
545 return -ENOMEM; 542 return -ENOMEM;
546 } 543 }
547 sb->s_root = root; 544 sb->s_root = root;
548 return 0; 545 return 0;
549 } 546 }
550 547
551 static const struct file_operations dlmfs_file 548 static const struct file_operations dlmfs_file_operations = {
552 .open = dlmfs_file_open, 549 .open = dlmfs_file_open,
553 .release = dlmfs_file_release, 550 .release = dlmfs_file_release,
554 .read = dlmfs_file_read, 551 .read = dlmfs_file_read,
555 .write = dlmfs_file_write, 552 .write = dlmfs_file_write,
556 }; 553 };
557 554
558 static const struct inode_operations dlmfs_dir 555 static const struct inode_operations dlmfs_dir_inode_operations = {
559 .create = dlmfs_create, 556 .create = dlmfs_create,
560 .lookup = simple_lookup, 557 .lookup = simple_lookup,
561 .unlink = dlmfs_unlink, 558 .unlink = dlmfs_unlink,
562 }; 559 };
563 560
564 /* this way we can restrict mkdir to only the 561 /* this way we can restrict mkdir to only the toplevel of the fs. */
565 static const struct inode_operations dlmfs_roo 562 static const struct inode_operations dlmfs_root_inode_operations = {
566 .lookup = simple_lookup, 563 .lookup = simple_lookup,
567 .mkdir = dlmfs_mkdir, 564 .mkdir = dlmfs_mkdir,
568 .rmdir = simple_rmdir, 565 .rmdir = simple_rmdir,
569 }; 566 };
570 567
571 static const struct super_operations dlmfs_ops 568 static const struct super_operations dlmfs_ops = {
572 .statfs = simple_statfs, 569 .statfs = simple_statfs,
573 .alloc_inode = dlmfs_alloc_inode, 570 .alloc_inode = dlmfs_alloc_inode,
574 .destroy_inode = dlmfs_destroy_inode, 571 .destroy_inode = dlmfs_destroy_inode,
575 .clear_inode = dlmfs_clear_inode, 572 .clear_inode = dlmfs_clear_inode,
576 .drop_inode = generic_delete_inode 573 .drop_inode = generic_delete_inode,
577 }; 574 };
578 575
579 static const struct inode_operations dlmfs_fil 576 static const struct inode_operations dlmfs_file_inode_operations = {
580 .getattr = simple_getattr, 577 .getattr = simple_getattr,
581 }; 578 };
582 579
583 static int dlmfs_get_sb(struct file_system_typ 580 static int dlmfs_get_sb(struct file_system_type *fs_type,
584 int flags, const char *dev_name, void 581 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
585 { 582 {
586 return get_sb_nodev(fs_type, flags, da 583 return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt);
587 } 584 }
588 585
589 static struct file_system_type dlmfs_fs_type = 586 static struct file_system_type dlmfs_fs_type = {
590 .owner = THIS_MODULE, 587 .owner = THIS_MODULE,
591 .name = "ocfs2_dlmfs", 588 .name = "ocfs2_dlmfs",
592 .get_sb = dlmfs_get_sb, 589 .get_sb = dlmfs_get_sb,
593 .kill_sb = kill_litter_super, 590 .kill_sb = kill_litter_super,
594 }; 591 };
595 592
596 static int __init init_dlmfs_fs(void) 593 static int __init init_dlmfs_fs(void)
597 { 594 {
598 int status; 595 int status;
599 int cleanup_inode = 0, cleanup_worker 596 int cleanup_inode = 0, cleanup_worker = 0;
600 597
601 dlmfs_print_version(); 598 dlmfs_print_version();
602 599
603 status = bdi_init(&dlmfs_backing_dev_i 600 status = bdi_init(&dlmfs_backing_dev_info);
604 if (status) 601 if (status)
605 return status; 602 return status;
606 603
607 dlmfs_inode_cache = kmem_cache_create( 604 dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache",
608 sizeof(struct 605 sizeof(struct dlmfs_inode_private),
609 0, (SLAB_HWCAC 606 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
610 SLAB_M 607 SLAB_MEM_SPREAD),
611 dlmfs_init_onc 608 dlmfs_init_once);
612 if (!dlmfs_inode_cache) !! 609 if (!dlmfs_inode_cache) {
>> 610 status = -ENOMEM;
613 goto bail; 611 goto bail;
>> 612 }
614 cleanup_inode = 1; 613 cleanup_inode = 1;
615 614
616 user_dlm_worker = create_singlethread_ 615 user_dlm_worker = create_singlethread_workqueue("user_dlm");
617 if (!user_dlm_worker) { 616 if (!user_dlm_worker) {
618 status = -ENOMEM; 617 status = -ENOMEM;
619 goto bail; 618 goto bail;
620 } 619 }
621 cleanup_worker = 1; 620 cleanup_worker = 1;
622 621
623 status = register_filesystem(&dlmfs_fs 622 status = register_filesystem(&dlmfs_fs_type);
624 bail: 623 bail:
625 if (status) { 624 if (status) {
626 if (cleanup_inode) 625 if (cleanup_inode)
627 kmem_cache_destroy(dlm 626 kmem_cache_destroy(dlmfs_inode_cache);
628 if (cleanup_worker) 627 if (cleanup_worker)
629 destroy_workqueue(user 628 destroy_workqueue(user_dlm_worker);
630 bdi_destroy(&dlmfs_backing_dev 629 bdi_destroy(&dlmfs_backing_dev_info);
631 } else 630 } else
632 printk("OCFS2 User DLM kernel 631 printk("OCFS2 User DLM kernel interface loaded\n");
633 return status; 632 return status;
634 } 633 }
635 634
636 static void __exit exit_dlmfs_fs(void) 635 static void __exit exit_dlmfs_fs(void)
637 { 636 {
638 unregister_filesystem(&dlmfs_fs_type); 637 unregister_filesystem(&dlmfs_fs_type);
639 638
640 flush_workqueue(user_dlm_worker); 639 flush_workqueue(user_dlm_worker);
641 destroy_workqueue(user_dlm_worker); 640 destroy_workqueue(user_dlm_worker);
642 641
643 kmem_cache_destroy(dlmfs_inode_cache); 642 kmem_cache_destroy(dlmfs_inode_cache);
644 643
645 bdi_destroy(&dlmfs_backing_dev_info); 644 bdi_destroy(&dlmfs_backing_dev_info);
646 } 645 }
647 646
648 MODULE_AUTHOR("Oracle"); 647 MODULE_AUTHOR("Oracle");
649 MODULE_LICENSE("GPL"); 648 MODULE_LICENSE("GPL");
650 649
651 module_init(init_dlmfs_fs) 650 module_init(init_dlmfs_fs)
652 module_exit(exit_dlmfs_fs) 651 module_exit(exit_dlmfs_fs)
653 652
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