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authorJoel Becker <joel.becker@oracle.com>2010-01-28 18:00:49 -0500
committerJoel Becker <joel.becker@oracle.com>2010-02-26 18:41:14 -0500
commit34a9dd7e29e9129fec40c645a03f1bbbe810e771 (patch)
tree43a149d9f9ea913d029e22aae066a6d9a9fc9f15 /fs/ocfs2/dlm
parent65b6f3403431cd43ef7b0dab679a50f770124a65 (diff)
ocfs2_dlmfs: Move to its own directory
We're going to remove the tie between ocfs2_dlmfs and o2dlm. ocfs2_dlmfs doesn't belong in the fs/ocfs2/dlm directory anymore. Here we move it to fs/ocfs2/dlmfs. Signed-off-by: Joel Becker <joel.becker@oracle.com>
Diffstat (limited to 'fs/ocfs2/dlm')
-rw-r--r--fs/ocfs2/dlm/Makefile3
-rw-r--r--fs/ocfs2/dlm/dlmfs.c710
-rw-r--r--fs/ocfs2/dlm/dlmfsver.c42
-rw-r--r--fs/ocfs2/dlm/dlmfsver.h31
-rw-r--r--fs/ocfs2/dlm/userdlm.c676
-rw-r--r--fs/ocfs2/dlm/userdlm.h113
6 files changed, 1 insertions, 1574 deletions
diff --git a/fs/ocfs2/dlm/Makefile b/fs/ocfs2/dlm/Makefile
index 190361375700..dcebf0d920fa 100644
--- a/fs/ocfs2/dlm/Makefile
+++ b/fs/ocfs2/dlm/Makefile
@@ -1,8 +1,7 @@
1EXTRA_CFLAGS += -Ifs/ocfs2 1EXTRA_CFLAGS += -Ifs/ocfs2
2 2
3obj-$(CONFIG_OCFS2_FS_O2CB) += ocfs2_dlm.o ocfs2_dlmfs.o 3obj-$(CONFIG_OCFS2_FS_O2CB) += ocfs2_dlm.o
4 4
5ocfs2_dlm-objs := dlmdomain.o dlmdebug.o dlmthread.o dlmrecovery.o \ 5ocfs2_dlm-objs := dlmdomain.o dlmdebug.o dlmthread.o dlmrecovery.o \
6 dlmmaster.o dlmast.o dlmconvert.o dlmlock.o dlmunlock.o dlmver.o 6 dlmmaster.o dlmast.o dlmconvert.o dlmlock.o dlmunlock.o dlmver.o
7 7
8ocfs2_dlmfs-objs := userdlm.o dlmfs.o dlmfsver.o
diff --git a/fs/ocfs2/dlm/dlmfs.c b/fs/ocfs2/dlm/dlmfs.c
deleted file mode 100644
index ddf55dafba2d..000000000000
--- a/fs/ocfs2/dlm/dlmfs.c
+++ /dev/null
@@ -1,710 +0,0 @@
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/backing-dev.h>
46#include <linux/poll.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#include "ocfs2_lockingver.h"
65
66static const struct super_operations dlmfs_ops;
67static const struct file_operations dlmfs_file_operations;
68static const struct inode_operations dlmfs_dir_inode_operations;
69static const struct inode_operations dlmfs_root_inode_operations;
70static const struct inode_operations dlmfs_file_inode_operations;
71static struct kmem_cache *dlmfs_inode_cache;
72
73struct workqueue_struct *user_dlm_worker;
74
75/*
76 * This is the userdlmfs locking protocol version.
77 *
78 * See fs/ocfs2/dlmglue.c for more details on locking versions.
79 */
80static const struct dlm_protocol_version user_locking_protocol = {
81 .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR,
82 .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR,
83};
84
85
86/*
87 * These are the ABI capabilities of dlmfs.
88 *
89 * Over time, dlmfs has added some features that were not part of the
90 * initial ABI. Unfortunately, some of these features are not detectable
91 * via standard usage. For example, Linux's default poll always returns
92 * POLLIN, so there is no way for a caller of poll(2) to know when dlmfs
93 * added poll support. Instead, we provide this list of new capabilities.
94 *
95 * Capabilities is a read-only attribute. We do it as a module parameter
96 * so we can discover it whether dlmfs is built in, loaded, or even not
97 * loaded.
98 *
99 * The ABI features are local to this machine's dlmfs mount. This is
100 * distinct from the locking protocol, which is concerned with inter-node
101 * interaction.
102 *
103 * Capabilities:
104 * - bast : POLLIN against the file descriptor of a held lock
105 * signifies a bast fired on the lock.
106 */
107#define DLMFS_CAPABILITIES "bast"
108extern int param_set_dlmfs_capabilities(const char *val,
109 struct kernel_param *kp)
110{
111 printk(KERN_ERR "%s: readonly parameter\n", kp->name);
112 return -EINVAL;
113}
114static int param_get_dlmfs_capabilities(char *buffer,
115 struct kernel_param *kp)
116{
117 return strlcpy(buffer, DLMFS_CAPABILITIES,
118 strlen(DLMFS_CAPABILITIES) + 1);
119}
120module_param_call(capabilities, param_set_dlmfs_capabilities,
121 param_get_dlmfs_capabilities, NULL, 0444);
122MODULE_PARM_DESC(capabilities, DLMFS_CAPABILITIES);
123
124
125/*
126 * decodes a set of open flags into a valid lock level and a set of flags.
127 * returns < 0 if we have invalid flags
128 * flags which mean something to us:
129 * O_RDONLY -> PRMODE level
130 * O_WRONLY -> EXMODE level
131 *
132 * O_NONBLOCK -> LKM_NOQUEUE
133 */
134static int dlmfs_decode_open_flags(int open_flags,
135 int *level,
136 int *flags)
137{
138 if (open_flags & (O_WRONLY|O_RDWR))
139 *level = LKM_EXMODE;
140 else
141 *level = LKM_PRMODE;
142
143 *flags = 0;
144 if (open_flags & O_NONBLOCK)
145 *flags |= LKM_NOQUEUE;
146
147 return 0;
148}
149
150static int dlmfs_file_open(struct inode *inode,
151 struct file *file)
152{
153 int status, level, flags;
154 struct dlmfs_filp_private *fp = NULL;
155 struct dlmfs_inode_private *ip;
156
157 if (S_ISDIR(inode->i_mode))
158 BUG();
159
160 mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino,
161 file->f_flags);
162
163 status = dlmfs_decode_open_flags(file->f_flags, &level, &flags);
164 if (status < 0)
165 goto bail;
166
167 /* We don't want to honor O_APPEND at read/write time as it
168 * doesn't make sense for LVB writes. */
169 file->f_flags &= ~O_APPEND;
170
171 fp = kmalloc(sizeof(*fp), GFP_NOFS);
172 if (!fp) {
173 status = -ENOMEM;
174 goto bail;
175 }
176 fp->fp_lock_level = level;
177
178 ip = DLMFS_I(inode);
179
180 status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags);
181 if (status < 0) {
182 /* this is a strange error to return here but I want
183 * to be able userspace to be able to distinguish a
184 * valid lock request from one that simply couldn't be
185 * granted. */
186 if (flags & LKM_NOQUEUE && status == -EAGAIN)
187 status = -ETXTBSY;
188 kfree(fp);
189 goto bail;
190 }
191
192 file->private_data = fp;
193bail:
194 return status;
195}
196
197static int dlmfs_file_release(struct inode *inode,
198 struct file *file)
199{
200 int level, status;
201 struct dlmfs_inode_private *ip = DLMFS_I(inode);
202 struct dlmfs_filp_private *fp =
203 (struct dlmfs_filp_private *) file->private_data;
204
205 if (S_ISDIR(inode->i_mode))
206 BUG();
207
208 mlog(0, "close called on inode %lu\n", inode->i_ino);
209
210 status = 0;
211 if (fp) {
212 level = fp->fp_lock_level;
213 if (level != LKM_IVMODE)
214 user_dlm_cluster_unlock(&ip->ip_lockres, level);
215
216 kfree(fp);
217 file->private_data = NULL;
218 }
219
220 return 0;
221}
222
223static unsigned int dlmfs_file_poll(struct file *file, poll_table *wait)
224{
225 int event = 0;
226 struct inode *inode = file->f_path.dentry->d_inode;
227 struct dlmfs_inode_private *ip = DLMFS_I(inode);
228
229 poll_wait(file, &ip->ip_lockres.l_event, wait);
230
231 spin_lock(&ip->ip_lockres.l_lock);
232 if (ip->ip_lockres.l_flags & USER_LOCK_BLOCKED)
233 event = POLLIN | POLLRDNORM;
234 spin_unlock(&ip->ip_lockres.l_lock);
235
236 return event;
237}
238
239static ssize_t dlmfs_file_read(struct file *filp,
240 char __user *buf,
241 size_t count,
242 loff_t *ppos)
243{
244 int bytes_left;
245 ssize_t readlen;
246 char *lvb_buf;
247 struct inode *inode = filp->f_path.dentry->d_inode;
248
249 mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
250 inode->i_ino, count, *ppos);
251
252 if (*ppos >= i_size_read(inode))
253 return 0;
254
255 if (!count)
256 return 0;
257
258 if (!access_ok(VERIFY_WRITE, buf, count))
259 return -EFAULT;
260
261 /* don't read past the lvb */
262 if ((count + *ppos) > i_size_read(inode))
263 readlen = i_size_read(inode) - *ppos;
264 else
265 readlen = count - *ppos;
266
267 lvb_buf = kmalloc(readlen, GFP_NOFS);
268 if (!lvb_buf)
269 return -ENOMEM;
270
271 user_dlm_read_lvb(inode, lvb_buf, readlen);
272 bytes_left = __copy_to_user(buf, lvb_buf, readlen);
273 readlen -= bytes_left;
274
275 kfree(lvb_buf);
276
277 *ppos = *ppos + readlen;
278
279 mlog(0, "read %zd bytes\n", readlen);
280 return readlen;
281}
282
283static ssize_t dlmfs_file_write(struct file *filp,
284 const char __user *buf,
285 size_t count,
286 loff_t *ppos)
287{
288 int bytes_left;
289 ssize_t writelen;
290 char *lvb_buf;
291 struct inode *inode = filp->f_path.dentry->d_inode;
292
293 mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
294 inode->i_ino, count, *ppos);
295
296 if (*ppos >= i_size_read(inode))
297 return -ENOSPC;
298
299 if (!count)
300 return 0;
301
302 if (!access_ok(VERIFY_READ, buf, count))
303 return -EFAULT;
304
305 /* don't write past the lvb */
306 if ((count + *ppos) > i_size_read(inode))
307 writelen = i_size_read(inode) - *ppos;
308 else
309 writelen = count - *ppos;
310
311 lvb_buf = kmalloc(writelen, GFP_NOFS);
312 if (!lvb_buf)
313 return -ENOMEM;
314
315 bytes_left = copy_from_user(lvb_buf, buf, writelen);
316 writelen -= bytes_left;
317 if (writelen)
318 user_dlm_write_lvb(inode, lvb_buf, writelen);
319
320 kfree(lvb_buf);
321
322 *ppos = *ppos + writelen;
323 mlog(0, "wrote %zd bytes\n", writelen);
324 return writelen;
325}
326
327static void dlmfs_init_once(void *foo)
328{
329 struct dlmfs_inode_private *ip =
330 (struct dlmfs_inode_private *) foo;
331
332 ip->ip_dlm = NULL;
333 ip->ip_parent = NULL;
334
335 inode_init_once(&ip->ip_vfs_inode);
336}
337
338static struct inode *dlmfs_alloc_inode(struct super_block *sb)
339{
340 struct dlmfs_inode_private *ip;
341
342 ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS);
343 if (!ip)
344 return NULL;
345
346 return &ip->ip_vfs_inode;
347}
348
349static void dlmfs_destroy_inode(struct inode *inode)
350{
351 kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode));
352}
353
354static void dlmfs_clear_inode(struct inode *inode)
355{
356 int status;
357 struct dlmfs_inode_private *ip;
358
359 if (!inode)
360 return;
361
362 mlog(0, "inode %lu\n", inode->i_ino);
363
364 ip = DLMFS_I(inode);
365
366 if (S_ISREG(inode->i_mode)) {
367 status = user_dlm_destroy_lock(&ip->ip_lockres);
368 if (status < 0)
369 mlog_errno(status);
370 iput(ip->ip_parent);
371 goto clear_fields;
372 }
373
374 mlog(0, "we're a directory, ip->ip_dlm = 0x%p\n", ip->ip_dlm);
375 /* we must be a directory. If required, lets unregister the
376 * dlm context now. */
377 if (ip->ip_dlm)
378 user_dlm_unregister_context(ip->ip_dlm);
379clear_fields:
380 ip->ip_parent = NULL;
381 ip->ip_dlm = NULL;
382}
383
384static struct backing_dev_info dlmfs_backing_dev_info = {
385 .name = "ocfs2-dlmfs",
386 .ra_pages = 0, /* No readahead */
387 .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
388};
389
390static struct inode *dlmfs_get_root_inode(struct super_block *sb)
391{
392 struct inode *inode = new_inode(sb);
393 int mode = S_IFDIR | 0755;
394 struct dlmfs_inode_private *ip;
395
396 if (inode) {
397 ip = DLMFS_I(inode);
398
399 inode->i_mode = mode;
400 inode->i_uid = current_fsuid();
401 inode->i_gid = current_fsgid();
402 inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
403 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
404 inc_nlink(inode);
405
406 inode->i_fop = &simple_dir_operations;
407 inode->i_op = &dlmfs_root_inode_operations;
408 }
409
410 return inode;
411}
412
413static struct inode *dlmfs_get_inode(struct inode *parent,
414 struct dentry *dentry,
415 int mode)
416{
417 struct super_block *sb = parent->i_sb;
418 struct inode * inode = new_inode(sb);
419 struct dlmfs_inode_private *ip;
420
421 if (!inode)
422 return NULL;
423
424 inode->i_mode = mode;
425 inode->i_uid = current_fsuid();
426 inode->i_gid = current_fsgid();
427 inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
428 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
429
430 ip = DLMFS_I(inode);
431 ip->ip_dlm = DLMFS_I(parent)->ip_dlm;
432
433 switch (mode & S_IFMT) {
434 default:
435 /* for now we don't support anything other than
436 * directories and regular files. */
437 BUG();
438 break;
439 case S_IFREG:
440 inode->i_op = &dlmfs_file_inode_operations;
441 inode->i_fop = &dlmfs_file_operations;
442
443 i_size_write(inode, DLM_LVB_LEN);
444
445 user_dlm_lock_res_init(&ip->ip_lockres, dentry);
446
447 /* released at clear_inode time, this insures that we
448 * get to drop the dlm reference on each lock *before*
449 * we call the unregister code for releasing parent
450 * directories. */
451 ip->ip_parent = igrab(parent);
452 BUG_ON(!ip->ip_parent);
453 break;
454 case S_IFDIR:
455 inode->i_op = &dlmfs_dir_inode_operations;
456 inode->i_fop = &simple_dir_operations;
457
458 /* directory inodes start off with i_nlink ==
459 * 2 (for "." entry) */
460 inc_nlink(inode);
461 break;
462 }
463
464 if (parent->i_mode & S_ISGID) {
465 inode->i_gid = parent->i_gid;
466 if (S_ISDIR(mode))
467 inode->i_mode |= S_ISGID;
468 }
469
470 return inode;
471}
472
473/*
474 * File creation. Allocate an inode, and we're done..
475 */
476/* SMP-safe */
477static int dlmfs_mkdir(struct inode * dir,
478 struct dentry * dentry,
479 int mode)
480{
481 int status;
482 struct inode *inode = NULL;
483 struct qstr *domain = &dentry->d_name;
484 struct dlmfs_inode_private *ip;
485 struct dlm_ctxt *dlm;
486 struct dlm_protocol_version proto = user_locking_protocol;
487
488 mlog(0, "mkdir %.*s\n", domain->len, domain->name);
489
490 /* verify that we have a proper domain */
491 if (domain->len >= O2NM_MAX_NAME_LEN) {
492 status = -EINVAL;
493 mlog(ML_ERROR, "invalid domain name for directory.\n");
494 goto bail;
495 }
496
497 inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR);
498 if (!inode) {
499 status = -ENOMEM;
500 mlog_errno(status);
501 goto bail;
502 }
503
504 ip = DLMFS_I(inode);
505
506 dlm = user_dlm_register_context(domain, &proto);
507 if (IS_ERR(dlm)) {
508 status = PTR_ERR(dlm);
509 mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n",
510 status, domain->len, domain->name);
511 goto bail;
512 }
513 ip->ip_dlm = dlm;
514
515 inc_nlink(dir);
516 d_instantiate(dentry, inode);
517 dget(dentry); /* Extra count - pin the dentry in core */
518
519 status = 0;
520bail:
521 if (status < 0)
522 iput(inode);
523 return status;
524}
525
526static int dlmfs_create(struct inode *dir,
527 struct dentry *dentry,
528 int mode,
529 struct nameidata *nd)
530{
531 int status = 0;
532 struct inode *inode;
533 struct qstr *name = &dentry->d_name;
534
535 mlog(0, "create %.*s\n", name->len, name->name);
536
537 /* verify name is valid and doesn't contain any dlm reserved
538 * characters */
539 if (name->len >= USER_DLM_LOCK_ID_MAX_LEN ||
540 name->name[0] == '$') {
541 status = -EINVAL;
542 mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len,
543 name->name);
544 goto bail;
545 }
546
547 inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG);
548 if (!inode) {
549 status = -ENOMEM;
550 mlog_errno(status);
551 goto bail;
552 }
553
554 d_instantiate(dentry, inode);
555 dget(dentry); /* Extra count - pin the dentry in core */
556bail:
557 return status;
558}
559
560static int dlmfs_unlink(struct inode *dir,
561 struct dentry *dentry)
562{
563 int status;
564 struct inode *inode = dentry->d_inode;
565
566 mlog(0, "unlink inode %lu\n", inode->i_ino);
567
568 /* if there are no current holders, or none that are waiting
569 * to acquire a lock, this basically destroys our lockres. */
570 status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres);
571 if (status < 0) {
572 mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n",
573 dentry->d_name.len, dentry->d_name.name, status);
574 goto bail;
575 }
576 status = simple_unlink(dir, dentry);
577bail:
578 return status;
579}
580
581static int dlmfs_fill_super(struct super_block * sb,
582 void * data,
583 int silent)
584{
585 struct inode * inode;
586 struct dentry * root;
587
588 sb->s_maxbytes = MAX_LFS_FILESIZE;
589 sb->s_blocksize = PAGE_CACHE_SIZE;
590 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
591 sb->s_magic = DLMFS_MAGIC;
592 sb->s_op = &dlmfs_ops;
593 inode = dlmfs_get_root_inode(sb);
594 if (!inode)
595 return -ENOMEM;
596
597 root = d_alloc_root(inode);
598 if (!root) {
599 iput(inode);
600 return -ENOMEM;
601 }
602 sb->s_root = root;
603 return 0;
604}
605
606static const struct file_operations dlmfs_file_operations = {
607 .open = dlmfs_file_open,
608 .release = dlmfs_file_release,
609 .poll = dlmfs_file_poll,
610 .read = dlmfs_file_read,
611 .write = dlmfs_file_write,
612};
613
614static const struct inode_operations dlmfs_dir_inode_operations = {
615 .create = dlmfs_create,
616 .lookup = simple_lookup,
617 .unlink = dlmfs_unlink,
618};
619
620/* this way we can restrict mkdir to only the toplevel of the fs. */
621static const struct inode_operations dlmfs_root_inode_operations = {
622 .lookup = simple_lookup,
623 .mkdir = dlmfs_mkdir,
624 .rmdir = simple_rmdir,
625};
626
627static const struct super_operations dlmfs_ops = {
628 .statfs = simple_statfs,
629 .alloc_inode = dlmfs_alloc_inode,
630 .destroy_inode = dlmfs_destroy_inode,
631 .clear_inode = dlmfs_clear_inode,
632 .drop_inode = generic_delete_inode,
633};
634
635static const struct inode_operations dlmfs_file_inode_operations = {
636 .getattr = simple_getattr,
637};
638
639static int dlmfs_get_sb(struct file_system_type *fs_type,
640 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
641{
642 return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt);
643}
644
645static struct file_system_type dlmfs_fs_type = {
646 .owner = THIS_MODULE,
647 .name = "ocfs2_dlmfs",
648 .get_sb = dlmfs_get_sb,
649 .kill_sb = kill_litter_super,
650};
651
652static int __init init_dlmfs_fs(void)
653{
654 int status;
655 int cleanup_inode = 0, cleanup_worker = 0;
656
657 dlmfs_print_version();
658
659 status = bdi_init(&dlmfs_backing_dev_info);
660 if (status)
661 return status;
662
663 dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache",
664 sizeof(struct dlmfs_inode_private),
665 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
666 SLAB_MEM_SPREAD),
667 dlmfs_init_once);
668 if (!dlmfs_inode_cache) {
669 status = -ENOMEM;
670 goto bail;
671 }
672 cleanup_inode = 1;
673
674 user_dlm_worker = create_singlethread_workqueue("user_dlm");
675 if (!user_dlm_worker) {
676 status = -ENOMEM;
677 goto bail;
678 }
679 cleanup_worker = 1;
680
681 status = register_filesystem(&dlmfs_fs_type);
682bail:
683 if (status) {
684 if (cleanup_inode)
685 kmem_cache_destroy(dlmfs_inode_cache);
686 if (cleanup_worker)
687 destroy_workqueue(user_dlm_worker);
688 bdi_destroy(&dlmfs_backing_dev_info);
689 } else
690 printk("OCFS2 User DLM kernel interface loaded\n");
691 return status;
692}
693
694static void __exit exit_dlmfs_fs(void)
695{
696 unregister_filesystem(&dlmfs_fs_type);
697
698 flush_workqueue(user_dlm_worker);
699 destroy_workqueue(user_dlm_worker);
700
701 kmem_cache_destroy(dlmfs_inode_cache);
702
703 bdi_destroy(&dlmfs_backing_dev_info);
704}
705
706MODULE_AUTHOR("Oracle");
707MODULE_LICENSE("GPL");
708
709module_init(init_dlmfs_fs)
710module_exit(exit_dlmfs_fs)
diff --git a/fs/ocfs2/dlm/dlmfsver.c b/fs/ocfs2/dlm/dlmfsver.c
deleted file mode 100644
index a733b3321f83..000000000000
--- a/fs/ocfs2/dlm/dlmfsver.c
+++ /dev/null
@@ -1,42 +0,0 @@
1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * dlmfsver.c
5 *
6 * version string
7 *
8 * Copyright (C) 2002, 2005 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26#include <linux/module.h>
27#include <linux/kernel.h>
28
29#include "dlmfsver.h"
30
31#define DLM_BUILD_VERSION "1.5.0"
32
33#define VERSION_STR "OCFS2 DLMFS " DLM_BUILD_VERSION
34
35void dlmfs_print_version(void)
36{
37 printk(KERN_INFO "%s\n", VERSION_STR);
38}
39
40MODULE_DESCRIPTION(VERSION_STR);
41
42MODULE_VERSION(DLM_BUILD_VERSION);
diff --git a/fs/ocfs2/dlm/dlmfsver.h b/fs/ocfs2/dlm/dlmfsver.h
deleted file mode 100644
index f35eadbed25c..000000000000
--- a/fs/ocfs2/dlm/dlmfsver.h
+++ /dev/null
@@ -1,31 +0,0 @@
1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * dlmver.h
5 *
6 * Function prototypes
7 *
8 * Copyright (C) 2005 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26#ifndef DLMFS_VER_H
27#define DLMFS_VER_H
28
29void dlmfs_print_version(void);
30
31#endif /* DLMFS_VER_H */
diff --git a/fs/ocfs2/dlm/userdlm.c b/fs/ocfs2/dlm/userdlm.c
deleted file mode 100644
index 4cb1d3dae250..000000000000
--- a/fs/ocfs2/dlm/userdlm.c
+++ /dev/null
@@ -1,676 +0,0 @@
1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * userdlm.c
5 *
6 * Code which implements the kernel side of a minimal userspace
7 * interface to our DLM.
8 *
9 * Many of the functions here are pared down versions of dlmglue.c
10 * functions.
11 *
12 * Copyright (C) 2003, 2004 Oracle. All rights reserved.
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public
16 * License as published by the Free Software Foundation; either
17 * version 2 of the License, or (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 * General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public
25 * License along with this program; if not, write to the
26 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
27 * Boston, MA 021110-1307, USA.
28 */
29
30#include <linux/signal.h>
31
32#include <linux/module.h>
33#include <linux/fs.h>
34#include <linux/types.h>
35#include <linux/crc32.h>
36
37
38#include "cluster/nodemanager.h"
39#include "cluster/heartbeat.h"
40#include "cluster/tcp.h"
41
42#include "dlmapi.h"
43
44#include "userdlm.h"
45
46#define MLOG_MASK_PREFIX ML_DLMFS
47#include "cluster/masklog.h"
48
49static inline int user_check_wait_flag(struct user_lock_res *lockres,
50 int flag)
51{
52 int ret;
53
54 spin_lock(&lockres->l_lock);
55 ret = lockres->l_flags & flag;
56 spin_unlock(&lockres->l_lock);
57
58 return ret;
59}
60
61static inline void user_wait_on_busy_lock(struct user_lock_res *lockres)
62
63{
64 wait_event(lockres->l_event,
65 !user_check_wait_flag(lockres, USER_LOCK_BUSY));
66}
67
68static inline void user_wait_on_blocked_lock(struct user_lock_res *lockres)
69
70{
71 wait_event(lockres->l_event,
72 !user_check_wait_flag(lockres, USER_LOCK_BLOCKED));
73}
74
75/* I heart container_of... */
76static inline struct dlm_ctxt *
77dlm_ctxt_from_user_lockres(struct user_lock_res *lockres)
78{
79 struct dlmfs_inode_private *ip;
80
81 ip = container_of(lockres,
82 struct dlmfs_inode_private,
83 ip_lockres);
84 return ip->ip_dlm;
85}
86
87static struct inode *
88user_dlm_inode_from_user_lockres(struct user_lock_res *lockres)
89{
90 struct dlmfs_inode_private *ip;
91
92 ip = container_of(lockres,
93 struct dlmfs_inode_private,
94 ip_lockres);
95 return &ip->ip_vfs_inode;
96}
97
98static inline void user_recover_from_dlm_error(struct user_lock_res *lockres)
99{
100 spin_lock(&lockres->l_lock);
101 lockres->l_flags &= ~USER_LOCK_BUSY;
102 spin_unlock(&lockres->l_lock);
103}
104
105#define user_log_dlm_error(_func, _stat, _lockres) do { \
106 mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \
107 "resource %.*s: %s\n", dlm_errname(_stat), _func, \
108 _lockres->l_namelen, _lockres->l_name, dlm_errmsg(_stat)); \
109} while (0)
110
111/* WARNING: This function lives in a world where the only three lock
112 * levels are EX, PR, and NL. It *will* have to be adjusted when more
113 * lock types are added. */
114static inline int user_highest_compat_lock_level(int level)
115{
116 int new_level = LKM_EXMODE;
117
118 if (level == LKM_EXMODE)
119 new_level = LKM_NLMODE;
120 else if (level == LKM_PRMODE)
121 new_level = LKM_PRMODE;
122 return new_level;
123}
124
125static void user_ast(void *opaque)
126{
127 struct user_lock_res *lockres = opaque;
128 struct dlm_lockstatus *lksb;
129
130 mlog(0, "AST fired for lockres %.*s\n", lockres->l_namelen,
131 lockres->l_name);
132
133 spin_lock(&lockres->l_lock);
134
135 lksb = &(lockres->l_lksb);
136 if (lksb->status != DLM_NORMAL) {
137 mlog(ML_ERROR, "lksb status value of %u on lockres %.*s\n",
138 lksb->status, lockres->l_namelen, lockres->l_name);
139 spin_unlock(&lockres->l_lock);
140 return;
141 }
142
143 mlog_bug_on_msg(lockres->l_requested == LKM_IVMODE,
144 "Lockres %.*s, requested ivmode. flags 0x%x\n",
145 lockres->l_namelen, lockres->l_name, lockres->l_flags);
146
147 /* we're downconverting. */
148 if (lockres->l_requested < lockres->l_level) {
149 if (lockres->l_requested <=
150 user_highest_compat_lock_level(lockres->l_blocking)) {
151 lockres->l_blocking = LKM_NLMODE;
152 lockres->l_flags &= ~USER_LOCK_BLOCKED;
153 }
154 }
155
156 lockres->l_level = lockres->l_requested;
157 lockres->l_requested = LKM_IVMODE;
158 lockres->l_flags |= USER_LOCK_ATTACHED;
159 lockres->l_flags &= ~USER_LOCK_BUSY;
160
161 spin_unlock(&lockres->l_lock);
162
163 wake_up(&lockres->l_event);
164}
165
166static inline void user_dlm_grab_inode_ref(struct user_lock_res *lockres)
167{
168 struct inode *inode;
169 inode = user_dlm_inode_from_user_lockres(lockres);
170 if (!igrab(inode))
171 BUG();
172}
173
174static void user_dlm_unblock_lock(struct work_struct *work);
175
176static void __user_dlm_queue_lockres(struct user_lock_res *lockres)
177{
178 if (!(lockres->l_flags & USER_LOCK_QUEUED)) {
179 user_dlm_grab_inode_ref(lockres);
180
181 INIT_WORK(&lockres->l_work, user_dlm_unblock_lock);
182
183 queue_work(user_dlm_worker, &lockres->l_work);
184 lockres->l_flags |= USER_LOCK_QUEUED;
185 }
186}
187
188static void __user_dlm_cond_queue_lockres(struct user_lock_res *lockres)
189{
190 int queue = 0;
191
192 if (!(lockres->l_flags & USER_LOCK_BLOCKED))
193 return;
194
195 switch (lockres->l_blocking) {
196 case LKM_EXMODE:
197 if (!lockres->l_ex_holders && !lockres->l_ro_holders)
198 queue = 1;
199 break;
200 case LKM_PRMODE:
201 if (!lockres->l_ex_holders)
202 queue = 1;
203 break;
204 default:
205 BUG();
206 }
207
208 if (queue)
209 __user_dlm_queue_lockres(lockres);
210}
211
212static void user_bast(void *opaque, int level)
213{
214 struct user_lock_res *lockres = opaque;
215
216 mlog(0, "Blocking AST fired for lockres %.*s. Blocking level %d\n",
217 lockres->l_namelen, lockres->l_name, level);
218
219 spin_lock(&lockres->l_lock);
220 lockres->l_flags |= USER_LOCK_BLOCKED;
221 if (level > lockres->l_blocking)
222 lockres->l_blocking = level;
223
224 __user_dlm_queue_lockres(lockres);
225 spin_unlock(&lockres->l_lock);
226
227 wake_up(&lockres->l_event);
228}
229
230static void user_unlock_ast(void *opaque, enum dlm_status status)
231{
232 struct user_lock_res *lockres = opaque;
233
234 mlog(0, "UNLOCK AST called on lock %.*s\n", lockres->l_namelen,
235 lockres->l_name);
236
237 if (status != DLM_NORMAL && status != DLM_CANCELGRANT)
238 mlog(ML_ERROR, "Dlm returns status %d\n", status);
239
240 spin_lock(&lockres->l_lock);
241 /* The teardown flag gets set early during the unlock process,
242 * so test the cancel flag to make sure that this ast isn't
243 * for a concurrent cancel. */
244 if (lockres->l_flags & USER_LOCK_IN_TEARDOWN
245 && !(lockres->l_flags & USER_LOCK_IN_CANCEL)) {
246 lockres->l_level = LKM_IVMODE;
247 } else if (status == DLM_CANCELGRANT) {
248 /* We tried to cancel a convert request, but it was
249 * already granted. Don't clear the busy flag - the
250 * ast should've done this already. */
251 BUG_ON(!(lockres->l_flags & USER_LOCK_IN_CANCEL));
252 lockres->l_flags &= ~USER_LOCK_IN_CANCEL;
253 goto out_noclear;
254 } else {
255 BUG_ON(!(lockres->l_flags & USER_LOCK_IN_CANCEL));
256 /* Cancel succeeded, we want to re-queue */
257 lockres->l_requested = LKM_IVMODE; /* cancel an
258 * upconvert
259 * request. */
260 lockres->l_flags &= ~USER_LOCK_IN_CANCEL;
261 /* we want the unblock thread to look at it again
262 * now. */
263 if (lockres->l_flags & USER_LOCK_BLOCKED)
264 __user_dlm_queue_lockres(lockres);
265 }
266
267 lockres->l_flags &= ~USER_LOCK_BUSY;
268out_noclear:
269 spin_unlock(&lockres->l_lock);
270
271 wake_up(&lockres->l_event);
272}
273
274static inline void user_dlm_drop_inode_ref(struct user_lock_res *lockres)
275{
276 struct inode *inode;
277 inode = user_dlm_inode_from_user_lockres(lockres);
278 iput(inode);
279}
280
281static void user_dlm_unblock_lock(struct work_struct *work)
282{
283 int new_level, status;
284 struct user_lock_res *lockres =
285 container_of(work, struct user_lock_res, l_work);
286 struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres);
287
288 mlog(0, "processing lockres %.*s\n", lockres->l_namelen,
289 lockres->l_name);
290
291 spin_lock(&lockres->l_lock);
292
293 mlog_bug_on_msg(!(lockres->l_flags & USER_LOCK_QUEUED),
294 "Lockres %.*s, flags 0x%x\n",
295 lockres->l_namelen, lockres->l_name, lockres->l_flags);
296
297 /* notice that we don't clear USER_LOCK_BLOCKED here. If it's
298 * set, we want user_ast clear it. */
299 lockres->l_flags &= ~USER_LOCK_QUEUED;
300
301 /* It's valid to get here and no longer be blocked - if we get
302 * several basts in a row, we might be queued by the first
303 * one, the unblock thread might run and clear the queued
304 * flag, and finally we might get another bast which re-queues
305 * us before our ast for the downconvert is called. */
306 if (!(lockres->l_flags & USER_LOCK_BLOCKED)) {
307 spin_unlock(&lockres->l_lock);
308 goto drop_ref;
309 }
310
311 if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) {
312 spin_unlock(&lockres->l_lock);
313 goto drop_ref;
314 }
315
316 if (lockres->l_flags & USER_LOCK_BUSY) {
317 if (lockres->l_flags & USER_LOCK_IN_CANCEL) {
318 spin_unlock(&lockres->l_lock);
319 goto drop_ref;
320 }
321
322 lockres->l_flags |= USER_LOCK_IN_CANCEL;
323 spin_unlock(&lockres->l_lock);
324
325 status = dlmunlock(dlm,
326 &lockres->l_lksb,
327 LKM_CANCEL,
328 user_unlock_ast,
329 lockres);
330 if (status != DLM_NORMAL)
331 user_log_dlm_error("dlmunlock", status, lockres);
332 goto drop_ref;
333 }
334
335 /* If there are still incompat holders, we can exit safely
336 * without worrying about re-queueing this lock as that will
337 * happen on the last call to user_cluster_unlock. */
338 if ((lockres->l_blocking == LKM_EXMODE)
339 && (lockres->l_ex_holders || lockres->l_ro_holders)) {
340 spin_unlock(&lockres->l_lock);
341 mlog(0, "can't downconvert for ex: ro = %u, ex = %u\n",
342 lockres->l_ro_holders, lockres->l_ex_holders);
343 goto drop_ref;
344 }
345
346 if ((lockres->l_blocking == LKM_PRMODE)
347 && lockres->l_ex_holders) {
348 spin_unlock(&lockres->l_lock);
349 mlog(0, "can't downconvert for pr: ex = %u\n",
350 lockres->l_ex_holders);
351 goto drop_ref;
352 }
353
354 /* yay, we can downconvert now. */
355 new_level = user_highest_compat_lock_level(lockres->l_blocking);
356 lockres->l_requested = new_level;
357 lockres->l_flags |= USER_LOCK_BUSY;
358 mlog(0, "Downconvert lock from %d to %d\n",
359 lockres->l_level, new_level);
360 spin_unlock(&lockres->l_lock);
361
362 /* need lock downconvert request now... */
363 status = dlmlock(dlm,
364 new_level,
365 &lockres->l_lksb,
366 LKM_CONVERT|LKM_VALBLK,
367 lockres->l_name,
368 lockres->l_namelen,
369 user_ast,
370 lockres,
371 user_bast);
372 if (status != DLM_NORMAL) {
373 user_log_dlm_error("dlmlock", status, lockres);
374 user_recover_from_dlm_error(lockres);
375 }
376
377drop_ref:
378 user_dlm_drop_inode_ref(lockres);
379}
380
381static inline void user_dlm_inc_holders(struct user_lock_res *lockres,
382 int level)
383{
384 switch(level) {
385 case LKM_EXMODE:
386 lockres->l_ex_holders++;
387 break;
388 case LKM_PRMODE:
389 lockres->l_ro_holders++;
390 break;
391 default:
392 BUG();
393 }
394}
395
396/* predict what lock level we'll be dropping down to on behalf
397 * of another node, and return true if the currently wanted
398 * level will be compatible with it. */
399static inline int
400user_may_continue_on_blocked_lock(struct user_lock_res *lockres,
401 int wanted)
402{
403 BUG_ON(!(lockres->l_flags & USER_LOCK_BLOCKED));
404
405 return wanted <= user_highest_compat_lock_level(lockres->l_blocking);
406}
407
408int user_dlm_cluster_lock(struct user_lock_res *lockres,
409 int level,
410 int lkm_flags)
411{
412 int status, local_flags;
413 struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres);
414
415 if (level != LKM_EXMODE &&
416 level != LKM_PRMODE) {
417 mlog(ML_ERROR, "lockres %.*s: invalid request!\n",
418 lockres->l_namelen, lockres->l_name);
419 status = -EINVAL;
420 goto bail;
421 }
422
423 mlog(0, "lockres %.*s: asking for %s lock, passed flags = 0x%x\n",
424 lockres->l_namelen, lockres->l_name,
425 (level == LKM_EXMODE) ? "LKM_EXMODE" : "LKM_PRMODE",
426 lkm_flags);
427
428again:
429 if (signal_pending(current)) {
430 status = -ERESTARTSYS;
431 goto bail;
432 }
433
434 spin_lock(&lockres->l_lock);
435
436 /* We only compare against the currently granted level
437 * here. If the lock is blocked waiting on a downconvert,
438 * we'll get caught below. */
439 if ((lockres->l_flags & USER_LOCK_BUSY) &&
440 (level > lockres->l_level)) {
441 /* is someone sitting in dlm_lock? If so, wait on
442 * them. */
443 spin_unlock(&lockres->l_lock);
444
445 user_wait_on_busy_lock(lockres);
446 goto again;
447 }
448
449 if ((lockres->l_flags & USER_LOCK_BLOCKED) &&
450 (!user_may_continue_on_blocked_lock(lockres, level))) {
451 /* is the lock is currently blocked on behalf of
452 * another node */
453 spin_unlock(&lockres->l_lock);
454
455 user_wait_on_blocked_lock(lockres);
456 goto again;
457 }
458
459 if (level > lockres->l_level) {
460 local_flags = lkm_flags | LKM_VALBLK;
461 if (lockres->l_level != LKM_IVMODE)
462 local_flags |= LKM_CONVERT;
463
464 lockres->l_requested = level;
465 lockres->l_flags |= USER_LOCK_BUSY;
466 spin_unlock(&lockres->l_lock);
467
468 BUG_ON(level == LKM_IVMODE);
469 BUG_ON(level == LKM_NLMODE);
470
471 /* call dlm_lock to upgrade lock now */
472 status = dlmlock(dlm,
473 level,
474 &lockres->l_lksb,
475 local_flags,
476 lockres->l_name,
477 lockres->l_namelen,
478 user_ast,
479 lockres,
480 user_bast);
481 if (status != DLM_NORMAL) {
482 if ((lkm_flags & LKM_NOQUEUE) &&
483 (status == DLM_NOTQUEUED))
484 status = -EAGAIN;
485 else {
486 user_log_dlm_error("dlmlock", status, lockres);
487 status = -EINVAL;
488 }
489 user_recover_from_dlm_error(lockres);
490 goto bail;
491 }
492
493 user_wait_on_busy_lock(lockres);
494 goto again;
495 }
496
497 user_dlm_inc_holders(lockres, level);
498 spin_unlock(&lockres->l_lock);
499
500 status = 0;
501bail:
502 return status;
503}
504
505static inline void user_dlm_dec_holders(struct user_lock_res *lockres,
506 int level)
507{
508 switch(level) {
509 case LKM_EXMODE:
510 BUG_ON(!lockres->l_ex_holders);
511 lockres->l_ex_holders--;
512 break;
513 case LKM_PRMODE:
514 BUG_ON(!lockres->l_ro_holders);
515 lockres->l_ro_holders--;
516 break;
517 default:
518 BUG();
519 }
520}
521
522void user_dlm_cluster_unlock(struct user_lock_res *lockres,
523 int level)
524{
525 if (level != LKM_EXMODE &&
526 level != LKM_PRMODE) {
527 mlog(ML_ERROR, "lockres %.*s: invalid request!\n",
528 lockres->l_namelen, lockres->l_name);
529 return;
530 }
531
532 spin_lock(&lockres->l_lock);
533 user_dlm_dec_holders(lockres, level);
534 __user_dlm_cond_queue_lockres(lockres);
535 spin_unlock(&lockres->l_lock);
536}
537
538void user_dlm_write_lvb(struct inode *inode,
539 const char *val,
540 unsigned int len)
541{
542 struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres;
543 char *lvb = lockres->l_lksb.lvb;
544
545 BUG_ON(len > DLM_LVB_LEN);
546
547 spin_lock(&lockres->l_lock);
548
549 BUG_ON(lockres->l_level < LKM_EXMODE);
550 memcpy(lvb, val, len);
551
552 spin_unlock(&lockres->l_lock);
553}
554
555void user_dlm_read_lvb(struct inode *inode,
556 char *val,
557 unsigned int len)
558{
559 struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres;
560 char *lvb = lockres->l_lksb.lvb;
561
562 BUG_ON(len > DLM_LVB_LEN);
563
564 spin_lock(&lockres->l_lock);
565
566 BUG_ON(lockres->l_level < LKM_PRMODE);
567 memcpy(val, lvb, len);
568
569 spin_unlock(&lockres->l_lock);
570}
571
572void user_dlm_lock_res_init(struct user_lock_res *lockres,
573 struct dentry *dentry)
574{
575 memset(lockres, 0, sizeof(*lockres));
576
577 spin_lock_init(&lockres->l_lock);
578 init_waitqueue_head(&lockres->l_event);
579 lockres->l_level = LKM_IVMODE;
580 lockres->l_requested = LKM_IVMODE;
581 lockres->l_blocking = LKM_IVMODE;
582
583 /* should have been checked before getting here. */
584 BUG_ON(dentry->d_name.len >= USER_DLM_LOCK_ID_MAX_LEN);
585
586 memcpy(lockres->l_name,
587 dentry->d_name.name,
588 dentry->d_name.len);
589 lockres->l_namelen = dentry->d_name.len;
590}
591
592int user_dlm_destroy_lock(struct user_lock_res *lockres)
593{
594 int status = -EBUSY;
595 struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres);
596
597 mlog(0, "asked to destroy %.*s\n", lockres->l_namelen, lockres->l_name);
598
599 spin_lock(&lockres->l_lock);
600 if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) {
601 spin_unlock(&lockres->l_lock);
602 return 0;
603 }
604
605 lockres->l_flags |= USER_LOCK_IN_TEARDOWN;
606
607 while (lockres->l_flags & USER_LOCK_BUSY) {
608 spin_unlock(&lockres->l_lock);
609
610 user_wait_on_busy_lock(lockres);
611
612 spin_lock(&lockres->l_lock);
613 }
614
615 if (lockres->l_ro_holders || lockres->l_ex_holders) {
616 spin_unlock(&lockres->l_lock);
617 goto bail;
618 }
619
620 status = 0;
621 if (!(lockres->l_flags & USER_LOCK_ATTACHED)) {
622 spin_unlock(&lockres->l_lock);
623 goto bail;
624 }
625
626 lockres->l_flags &= ~USER_LOCK_ATTACHED;
627 lockres->l_flags |= USER_LOCK_BUSY;
628 spin_unlock(&lockres->l_lock);
629
630 status = dlmunlock(dlm,
631 &lockres->l_lksb,
632 LKM_VALBLK,
633 user_unlock_ast,
634 lockres);
635 if (status != DLM_NORMAL) {
636 user_log_dlm_error("dlmunlock", status, lockres);
637 status = -EINVAL;
638 goto bail;
639 }
640
641 user_wait_on_busy_lock(lockres);
642
643 status = 0;
644bail:
645 return status;
646}
647
648struct dlm_ctxt *user_dlm_register_context(struct qstr *name,
649 struct dlm_protocol_version *proto)
650{
651 struct dlm_ctxt *dlm;
652 u32 dlm_key;
653 char *domain;
654
655 domain = kmalloc(name->len + 1, GFP_NOFS);
656 if (!domain) {
657 mlog_errno(-ENOMEM);
658 return ERR_PTR(-ENOMEM);
659 }
660
661 dlm_key = crc32_le(0, name->name, name->len);
662
663 snprintf(domain, name->len + 1, "%.*s", name->len, name->name);
664
665 dlm = dlm_register_domain(domain, dlm_key, proto);
666 if (IS_ERR(dlm))
667 mlog_errno(PTR_ERR(dlm));
668
669 kfree(domain);
670 return dlm;
671}
672
673void user_dlm_unregister_context(struct dlm_ctxt *dlm)
674{
675 dlm_unregister_domain(dlm);
676}
diff --git a/fs/ocfs2/dlm/userdlm.h b/fs/ocfs2/dlm/userdlm.h
deleted file mode 100644
index 0c3cc03c61fa..000000000000
--- a/fs/ocfs2/dlm/userdlm.h
+++ /dev/null
@@ -1,113 +0,0 @@
1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * userdlm.h
5 *
6 * Userspace dlm defines
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26
27#ifndef USERDLM_H
28#define USERDLM_H
29
30#include <linux/module.h>
31#include <linux/fs.h>
32#include <linux/types.h>
33#include <linux/workqueue.h>
34
35/* user_lock_res->l_flags flags. */
36#define USER_LOCK_ATTACHED (0x00000001) /* we have initialized
37 * the lvb */
38#define USER_LOCK_BUSY (0x00000002) /* we are currently in
39 * dlm_lock */
40#define USER_LOCK_BLOCKED (0x00000004) /* blocked waiting to
41 * downconvert*/
42#define USER_LOCK_IN_TEARDOWN (0x00000008) /* we're currently
43 * destroying this
44 * lock. */
45#define USER_LOCK_QUEUED (0x00000010) /* lock is on the
46 * workqueue */
47#define USER_LOCK_IN_CANCEL (0x00000020)
48
49struct user_lock_res {
50 spinlock_t l_lock;
51
52 int l_flags;
53
54#define USER_DLM_LOCK_ID_MAX_LEN 32
55 char l_name[USER_DLM_LOCK_ID_MAX_LEN];
56 int l_namelen;
57 int l_level;
58 unsigned int l_ro_holders;
59 unsigned int l_ex_holders;
60 struct dlm_lockstatus l_lksb;
61
62 int l_requested;
63 int l_blocking;
64
65 wait_queue_head_t l_event;
66
67 struct work_struct l_work;
68};
69
70extern struct workqueue_struct *user_dlm_worker;
71
72void user_dlm_lock_res_init(struct user_lock_res *lockres,
73 struct dentry *dentry);
74int user_dlm_destroy_lock(struct user_lock_res *lockres);
75int user_dlm_cluster_lock(struct user_lock_res *lockres,
76 int level,
77 int lkm_flags);
78void user_dlm_cluster_unlock(struct user_lock_res *lockres,
79 int level);
80void user_dlm_write_lvb(struct inode *inode,
81 const char *val,
82 unsigned int len);
83void user_dlm_read_lvb(struct inode *inode,
84 char *val,
85 unsigned int len);
86struct dlm_ctxt *user_dlm_register_context(struct qstr *name,
87 struct dlm_protocol_version *proto);
88void user_dlm_unregister_context(struct dlm_ctxt *dlm);
89
90struct dlmfs_inode_private {
91 struct dlm_ctxt *ip_dlm;
92
93 struct user_lock_res ip_lockres; /* unused for directories. */
94 struct inode *ip_parent;
95
96 struct inode ip_vfs_inode;
97};
98
99static inline struct dlmfs_inode_private *
100DLMFS_I(struct inode *inode)
101{
102 return container_of(inode,
103 struct dlmfs_inode_private,
104 ip_vfs_inode);
105}
106
107struct dlmfs_filp_private {
108 int fp_lock_level;
109};
110
111#define DLMFS_MAGIC 0x76a9f425
112
113#endif /* USERDLM_H */
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-09 22:19:27 -0500