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TOMOYO Linux Cross Reference
Linux/fs/ocfs2/dlmfs/dlmfs.c

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  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 #include "stackglue.h"
 51 #include "userdlm.h"
 52 #include "dlmfsver.h"
 53 
 54 #define MLOG_MASK_PREFIX ML_DLMFS
 55 #include "cluster/masklog.h"
 56 
 57 
 58 static const struct super_operations dlmfs_ops;
 59 static const struct file_operations dlmfs_file_operations;
 60 static const struct inode_operations dlmfs_dir_inode_operations;
 61 static const struct inode_operations dlmfs_root_inode_operations;
 62 static const struct inode_operations dlmfs_file_inode_operations;
 63 static struct kmem_cache *dlmfs_inode_cache;
 64 
 65 struct workqueue_struct *user_dlm_worker;
 66 
 67 
 68 
 69 /*
 70  * These are the ABI capabilities of dlmfs.
 71  *
 72  * Over time, dlmfs has added some features that were not part of the
 73  * initial ABI.  Unfortunately, some of these features are not detectable
 74  * via standard usage.  For example, Linux's default poll always returns
 75  * POLLIN, so there is no way for a caller of poll(2) to know when dlmfs
 76  * added poll support.  Instead, we provide this list of new capabilities.
 77  *
 78  * Capabilities is a read-only attribute.  We do it as a module parameter
 79  * so we can discover it whether dlmfs is built in, loaded, or even not
 80  * loaded.
 81  *
 82  * The ABI features are local to this machine's dlmfs mount.  This is
 83  * distinct from the locking protocol, which is concerned with inter-node
 84  * interaction.
 85  *
 86  * Capabilities:
 87  * - bast       : POLLIN against the file descriptor of a held lock
 88  *                signifies a bast fired on the lock.
 89  */
 90 #define DLMFS_CAPABILITIES "bast stackglue"
 91 static int param_set_dlmfs_capabilities(const char *val,
 92                                         struct kernel_param *kp)
 93 {
 94         printk(KERN_ERR "%s: readonly parameter\n", kp->name);
 95         return -EINVAL;
 96 }
 97 static int param_get_dlmfs_capabilities(char *buffer,
 98                                         struct kernel_param *kp)
 99 {
100         return strlcpy(buffer, DLMFS_CAPABILITIES,
101                        strlen(DLMFS_CAPABILITIES) + 1);
102 }
103 module_param_call(capabilities, param_set_dlmfs_capabilities,
104                   param_get_dlmfs_capabilities, NULL, 0444);
105 MODULE_PARM_DESC(capabilities, DLMFS_CAPABILITIES);
106 
107 
108 /*
109  * decodes a set of open flags into a valid lock level and a set of flags.
110  * returns < 0 if we have invalid flags
111  * flags which mean something to us:
112  * O_RDONLY -> PRMODE level
113  * O_WRONLY -> EXMODE level
114  *
115  * O_NONBLOCK -> NOQUEUE
116  */
117 static int dlmfs_decode_open_flags(int open_flags,
118                                    int *level,
119                                    int *flags)
120 {
121         if (open_flags & (O_WRONLY|O_RDWR))
122                 *level = DLM_LOCK_EX;
123         else
124                 *level = DLM_LOCK_PR;
125 
126         *flags = 0;
127         if (open_flags & O_NONBLOCK)
128                 *flags |= DLM_LKF_NOQUEUE;
129 
130         return 0;
131 }
132 
133 static int dlmfs_file_open(struct inode *inode,
134                            struct file *file)
135 {
136         int status, level, flags;
137         struct dlmfs_filp_private *fp = NULL;
138         struct dlmfs_inode_private *ip;
139 
140         if (S_ISDIR(inode->i_mode))
141                 BUG();
142 
143         mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino,
144                 file->f_flags);
145 
146         status = dlmfs_decode_open_flags(file->f_flags, &level, &flags);
147         if (status < 0)
148                 goto bail;
149 
150         /* We don't want to honor O_APPEND at read/write time as it
151          * doesn't make sense for LVB writes. */
152         file->f_flags &= ~O_APPEND;
153 
154         fp = kmalloc(sizeof(*fp), GFP_NOFS);
155         if (!fp) {
156                 status = -ENOMEM;
157                 goto bail;
158         }
159         fp->fp_lock_level = level;
160 
161         ip = DLMFS_I(inode);
162 
163         status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags);
164         if (status < 0) {
165                 /* this is a strange error to return here but I want
166                  * to be able userspace to be able to distinguish a
167                  * valid lock request from one that simply couldn't be
168                  * granted. */
169                 if (flags & DLM_LKF_NOQUEUE && status == -EAGAIN)
170                         status = -ETXTBSY;
171                 kfree(fp);
172                 goto bail;
173         }
174 
175         file->private_data = fp;
176 bail:
177         return status;
178 }
179 
180 static int dlmfs_file_release(struct inode *inode,
181                               struct file *file)
182 {
183         int level, status;
184         struct dlmfs_inode_private *ip = DLMFS_I(inode);
185         struct dlmfs_filp_private *fp = file->private_data;
186 
187         if (S_ISDIR(inode->i_mode))
188                 BUG();
189 
190         mlog(0, "close called on inode %lu\n", inode->i_ino);
191 
192         status = 0;
193         if (fp) {
194                 level = fp->fp_lock_level;
195                 if (level != DLM_LOCK_IV)
196                         user_dlm_cluster_unlock(&ip->ip_lockres, level);
197 
198                 kfree(fp);
199                 file->private_data = NULL;
200         }
201 
202         return 0;
203 }
204 
205 /*
206  * We do ->setattr() just to override size changes.  Our size is the size
207  * of the LVB and nothing else.
208  */
209 static int dlmfs_file_setattr(struct dentry *dentry, struct iattr *attr)
210 {
211         int error;
212         struct inode *inode = dentry->d_inode;
213 
214         attr->ia_valid &= ~ATTR_SIZE;
215         error = inode_change_ok(inode, attr);
216         if (error)
217                 return error;
218 
219         setattr_copy(inode, attr);
220         mark_inode_dirty(inode);
221         return 0;
222 }
223 
224 static unsigned int dlmfs_file_poll(struct file *file, poll_table *wait)
225 {
226         int event = 0;
227         struct inode *inode = file_inode(file);
228         struct dlmfs_inode_private *ip = DLMFS_I(inode);
229 
230         poll_wait(file, &ip->ip_lockres.l_event, wait);
231 
232         spin_lock(&ip->ip_lockres.l_lock);
233         if (ip->ip_lockres.l_flags & USER_LOCK_BLOCKED)
234                 event = POLLIN | POLLRDNORM;
235         spin_unlock(&ip->ip_lockres.l_lock);
236 
237         return event;
238 }
239 
240 static ssize_t dlmfs_file_read(struct file *filp,
241                                char __user *buf,
242                                size_t count,
243                                loff_t *ppos)
244 {
245         int bytes_left;
246         ssize_t readlen, got;
247         char *lvb_buf;
248         struct inode *inode = file_inode(filp);
249 
250         mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
251                 inode->i_ino, count, *ppos);
252 
253         if (*ppos >= i_size_read(inode))
254                 return 0;
255 
256         if (!count)
257                 return 0;
258 
259         if (!access_ok(VERIFY_WRITE, buf, count))
260                 return -EFAULT;
261 
262         /* don't read past the lvb */
263         if ((count + *ppos) > i_size_read(inode))
264                 readlen = i_size_read(inode) - *ppos;
265         else
266                 readlen = count;
267 
268         lvb_buf = kmalloc(readlen, GFP_NOFS);
269         if (!lvb_buf)
270                 return -ENOMEM;
271 
272         got = user_dlm_read_lvb(inode, lvb_buf, readlen);
273         if (got) {
274                 BUG_ON(got != readlen);
275                 bytes_left = __copy_to_user(buf, lvb_buf, readlen);
276                 readlen -= bytes_left;
277         } else
278                 readlen = 0;
279 
280         kfree(lvb_buf);
281 
282         *ppos = *ppos + readlen;
283 
284         mlog(0, "read %zd bytes\n", readlen);
285         return readlen;
286 }
287 
288 static ssize_t dlmfs_file_write(struct file *filp,
289                                 const char __user *buf,
290                                 size_t count,
291                                 loff_t *ppos)
292 {
293         int bytes_left;
294         ssize_t writelen;
295         char *lvb_buf;
296         struct inode *inode = file_inode(filp);
297 
298         mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
299                 inode->i_ino, count, *ppos);
300 
301         if (*ppos >= i_size_read(inode))
302                 return -ENOSPC;
303 
304         if (!count)
305                 return 0;
306 
307         if (!access_ok(VERIFY_READ, buf, count))
308                 return -EFAULT;
309 
310         /* don't write past the lvb */
311         if ((count + *ppos) > i_size_read(inode))
312                 writelen = i_size_read(inode) - *ppos;
313         else
314                 writelen = count - *ppos;
315 
316         lvb_buf = kmalloc(writelen, GFP_NOFS);
317         if (!lvb_buf)
318                 return -ENOMEM;
319 
320         bytes_left = copy_from_user(lvb_buf, buf, writelen);
321         writelen -= bytes_left;
322         if (writelen)
323                 user_dlm_write_lvb(inode, lvb_buf, writelen);
324 
325         kfree(lvb_buf);
326 
327         *ppos = *ppos + writelen;
328         mlog(0, "wrote %zd bytes\n", writelen);
329         return writelen;
330 }
331 
332 static void dlmfs_init_once(void *foo)
333 {
334         struct dlmfs_inode_private *ip =
335                 (struct dlmfs_inode_private *) foo;
336 
337         ip->ip_conn = NULL;
338         ip->ip_parent = NULL;
339 
340         inode_init_once(&ip->ip_vfs_inode);
341 }
342 
343 static struct inode *dlmfs_alloc_inode(struct super_block *sb)
344 {
345         struct dlmfs_inode_private *ip;
346 
347         ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS);
348         if (!ip)
349                 return NULL;
350 
351         return &ip->ip_vfs_inode;
352 }
353 
354 static void dlmfs_i_callback(struct rcu_head *head)
355 {
356         struct inode *inode = container_of(head, struct inode, i_rcu);
357         kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode));
358 }
359 
360 static void dlmfs_destroy_inode(struct inode *inode)
361 {
362         call_rcu(&inode->i_rcu, dlmfs_i_callback);
363 }
364 
365 static void dlmfs_evict_inode(struct inode *inode)
366 {
367         int status;
368         struct dlmfs_inode_private *ip;
369 
370         clear_inode(inode);
371 
372         mlog(0, "inode %lu\n", inode->i_ino);
373 
374         ip = DLMFS_I(inode);
375 
376         if (S_ISREG(inode->i_mode)) {
377                 status = user_dlm_destroy_lock(&ip->ip_lockres);
378                 if (status < 0)
379                         mlog_errno(status);
380                 iput(ip->ip_parent);
381                 goto clear_fields;
382         }
383 
384         mlog(0, "we're a directory, ip->ip_conn = 0x%p\n", ip->ip_conn);
385         /* we must be a directory. If required, lets unregister the
386          * dlm context now. */
387         if (ip->ip_conn)
388                 user_dlm_unregister(ip->ip_conn);
389 clear_fields:
390         ip->ip_parent = NULL;
391         ip->ip_conn = NULL;
392 }
393 
394 static struct backing_dev_info dlmfs_backing_dev_info = {
395         .name           = "ocfs2-dlmfs",
396         .ra_pages       = 0,    /* No readahead */
397         .capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK,
398 };
399 
400 static struct inode *dlmfs_get_root_inode(struct super_block *sb)
401 {
402         struct inode *inode = new_inode(sb);
403         umode_t mode = S_IFDIR | 0755;
404         struct dlmfs_inode_private *ip;
405 
406         if (inode) {
407                 ip = DLMFS_I(inode);
408 
409                 inode->i_ino = get_next_ino();
410                 inode_init_owner(inode, NULL, mode);
411                 inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
412                 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
413                 inc_nlink(inode);
414 
415                 inode->i_fop = &simple_dir_operations;
416                 inode->i_op = &dlmfs_root_inode_operations;
417         }
418 
419         return inode;
420 }
421 
422 static struct inode *dlmfs_get_inode(struct inode *parent,
423                                      struct dentry *dentry,
424                                      umode_t mode)
425 {
426         struct super_block *sb = parent->i_sb;
427         struct inode * inode = new_inode(sb);
428         struct dlmfs_inode_private *ip;
429 
430         if (!inode)
431                 return NULL;
432 
433         inode->i_ino = get_next_ino();
434         inode_init_owner(inode, parent, mode);
435         inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
436         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
437 
438         ip = DLMFS_I(inode);
439         ip->ip_conn = DLMFS_I(parent)->ip_conn;
440 
441         switch (mode & S_IFMT) {
442         default:
443                 /* for now we don't support anything other than
444                  * directories and regular files. */
445                 BUG();
446                 break;
447         case S_IFREG:
448                 inode->i_op = &dlmfs_file_inode_operations;
449                 inode->i_fop = &dlmfs_file_operations;
450 
451                 i_size_write(inode,  DLM_LVB_LEN);
452 
453                 user_dlm_lock_res_init(&ip->ip_lockres, dentry);
454 
455                 /* released at clear_inode time, this insures that we
456                  * get to drop the dlm reference on each lock *before*
457                  * we call the unregister code for releasing parent
458                  * directories. */
459                 ip->ip_parent = igrab(parent);
460                 BUG_ON(!ip->ip_parent);
461                 break;
462         case S_IFDIR:
463                 inode->i_op = &dlmfs_dir_inode_operations;
464                 inode->i_fop = &simple_dir_operations;
465 
466                 /* directory inodes start off with i_nlink ==
467                  * 2 (for "." entry) */
468                 inc_nlink(inode);
469                 break;
470         }
471         return inode;
472 }
473 
474 /*
475  * File creation. Allocate an inode, and we're done..
476  */
477 /* SMP-safe */
478 static int dlmfs_mkdir(struct inode * dir,
479                        struct dentry * dentry,
480                        umode_t mode)
481 {
482         int status;
483         struct inode *inode = NULL;
484         struct qstr *domain = &dentry->d_name;
485         struct dlmfs_inode_private *ip;
486         struct ocfs2_cluster_connection *conn;
487 
488         mlog(0, "mkdir %.*s\n", domain->len, domain->name);
489 
490         /* verify that we have a proper domain */
491         if (domain->len >= GROUP_NAME_MAX) {
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         conn = user_dlm_register(domain);
507         if (IS_ERR(conn)) {
508                 status = PTR_ERR(conn);
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_conn = conn;
514 
515         inc_nlink(dir);
516         d_instantiate(dentry, inode);
517         dget(dentry);   /* Extra count - pin the dentry in core */
518 
519         status = 0;
520 bail:
521         if (status < 0)
522                 iput(inode);
523         return status;
524 }
525 
526 static int dlmfs_create(struct inode *dir,
527                         struct dentry *dentry,
528                         umode_t mode,
529                         bool excl)
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 */
556 bail:
557         return status;
558 }
559 
560 static 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);
577 bail:
578         return status;
579 }
580 
581 static int dlmfs_fill_super(struct super_block * sb,
582                             void * data,
583                             int silent)
584 {
585         sb->s_maxbytes = MAX_LFS_FILESIZE;
586         sb->s_blocksize = PAGE_CACHE_SIZE;
587         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
588         sb->s_magic = DLMFS_MAGIC;
589         sb->s_op = &dlmfs_ops;
590         sb->s_root = d_make_root(dlmfs_get_root_inode(sb));
591         if (!sb->s_root)
592                 return -ENOMEM;
593         return 0;
594 }
595 
596 static const struct file_operations dlmfs_file_operations = {
597         .open           = dlmfs_file_open,
598         .release        = dlmfs_file_release,
599         .poll           = dlmfs_file_poll,
600         .read           = dlmfs_file_read,
601         .write          = dlmfs_file_write,
602         .llseek         = default_llseek,
603 };
604 
605 static const struct inode_operations dlmfs_dir_inode_operations = {
606         .create         = dlmfs_create,
607         .lookup         = simple_lookup,
608         .unlink         = dlmfs_unlink,
609 };
610 
611 /* this way we can restrict mkdir to only the toplevel of the fs. */
612 static const struct inode_operations dlmfs_root_inode_operations = {
613         .lookup         = simple_lookup,
614         .mkdir          = dlmfs_mkdir,
615         .rmdir          = simple_rmdir,
616 };
617 
618 static const struct super_operations dlmfs_ops = {
619         .statfs         = simple_statfs,
620         .alloc_inode    = dlmfs_alloc_inode,
621         .destroy_inode  = dlmfs_destroy_inode,
622         .evict_inode    = dlmfs_evict_inode,
623         .drop_inode     = generic_delete_inode,
624 };
625 
626 static const struct inode_operations dlmfs_file_inode_operations = {
627         .getattr        = simple_getattr,
628         .setattr        = dlmfs_file_setattr,
629 };
630 
631 static struct dentry *dlmfs_mount(struct file_system_type *fs_type,
632         int flags, const char *dev_name, void *data)
633 {
634         return mount_nodev(fs_type, flags, data, dlmfs_fill_super);
635 }
636 
637 static struct file_system_type dlmfs_fs_type = {
638         .owner          = THIS_MODULE,
639         .name           = "ocfs2_dlmfs",
640         .mount          = dlmfs_mount,
641         .kill_sb        = kill_litter_super,
642 };
643 MODULE_ALIAS_FS("ocfs2_dlmfs");
644 
645 static int __init init_dlmfs_fs(void)
646 {
647         int status;
648         int cleanup_inode = 0, cleanup_worker = 0;
649 
650         dlmfs_print_version();
651 
652         status = bdi_init(&dlmfs_backing_dev_info);
653         if (status)
654                 return status;
655 
656         dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache",
657                                 sizeof(struct dlmfs_inode_private),
658                                 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
659                                         SLAB_MEM_SPREAD),
660                                 dlmfs_init_once);
661         if (!dlmfs_inode_cache) {
662                 status = -ENOMEM;
663                 goto bail;
664         }
665         cleanup_inode = 1;
666 
667         user_dlm_worker = create_singlethread_workqueue("user_dlm");
668         if (!user_dlm_worker) {
669                 status = -ENOMEM;
670                 goto bail;
671         }
672         cleanup_worker = 1;
673 
674         user_dlm_set_locking_protocol();
675         status = register_filesystem(&dlmfs_fs_type);
676 bail:
677         if (status) {
678                 if (cleanup_inode)
679                         kmem_cache_destroy(dlmfs_inode_cache);
680                 if (cleanup_worker)
681                         destroy_workqueue(user_dlm_worker);
682                 bdi_destroy(&dlmfs_backing_dev_info);
683         } else
684                 printk("OCFS2 User DLM kernel interface loaded\n");
685         return status;
686 }
687 
688 static void __exit exit_dlmfs_fs(void)
689 {
690         unregister_filesystem(&dlmfs_fs_type);
691 
692         flush_workqueue(user_dlm_worker);
693         destroy_workqueue(user_dlm_worker);
694 
695         /*
696          * Make sure all delayed rcu free inodes are flushed before we
697          * destroy cache.
698          */
699         rcu_barrier();
700         kmem_cache_destroy(dlmfs_inode_cache);
701 
702         bdi_destroy(&dlmfs_backing_dev_info);
703 }
704 
705 MODULE_AUTHOR("Oracle");
706 MODULE_LICENSE("GPL");
707 
708 module_init(init_dlmfs_fs)
709 module_exit(exit_dlmfs_fs)
710 

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