xref: /openbmc/linux/fs/jfs/super.c (revision f7018c21)
1 /*
2  *   Copyright (C) International Business Machines Corp., 2000-2004
3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
4  *
5  *   This program is free software;  you can redistribute it and/or modify
6  *   it under the terms of the GNU General Public License as published by
7  *   the Free Software Foundation; either version 2 of the License, or
8  *   (at your option) any later version.
9  *
10  *   This program is distributed in the hope that it will be useful,
11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
13  *   the GNU General Public License for more details.
14  *
15  *   You should have received a copy of the GNU General Public License
16  *   along with this program;  if not, write to the Free Software
17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  */
19 
20 #include <linux/fs.h>
21 #include <linux/module.h>
22 #include <linux/parser.h>
23 #include <linux/completion.h>
24 #include <linux/vfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/mount.h>
27 #include <linux/moduleparam.h>
28 #include <linux/kthread.h>
29 #include <linux/posix_acl.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/crc32.h>
33 #include <linux/slab.h>
34 #include <asm/uaccess.h>
35 #include <linux/seq_file.h>
36 #include <linux/blkdev.h>
37 
38 #include "jfs_incore.h"
39 #include "jfs_filsys.h"
40 #include "jfs_inode.h"
41 #include "jfs_metapage.h"
42 #include "jfs_superblock.h"
43 #include "jfs_dmap.h"
44 #include "jfs_imap.h"
45 #include "jfs_acl.h"
46 #include "jfs_debug.h"
47 #include "jfs_xattr.h"
48 
49 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
50 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
51 MODULE_LICENSE("GPL");
52 
53 static struct kmem_cache * jfs_inode_cachep;
54 
55 static const struct super_operations jfs_super_operations;
56 static const struct export_operations jfs_export_operations;
57 static struct file_system_type jfs_fs_type;
58 
59 #define MAX_COMMIT_THREADS 64
60 static int commit_threads = 0;
61 module_param(commit_threads, int, 0);
62 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
63 
64 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
65 struct task_struct *jfsIOthread;
66 struct task_struct *jfsSyncThread;
67 
68 #ifdef CONFIG_JFS_DEBUG
69 int jfsloglevel = JFS_LOGLEVEL_WARN;
70 module_param(jfsloglevel, int, 0644);
71 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
72 #endif
73 
74 static void jfs_handle_error(struct super_block *sb)
75 {
76 	struct jfs_sb_info *sbi = JFS_SBI(sb);
77 
78 	if (sb->s_flags & MS_RDONLY)
79 		return;
80 
81 	updateSuper(sb, FM_DIRTY);
82 
83 	if (sbi->flag & JFS_ERR_PANIC)
84 		panic("JFS (device %s): panic forced after error\n",
85 			sb->s_id);
86 	else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
87 		jfs_err("ERROR: (device %s): remounting filesystem "
88 			"as read-only\n",
89 			sb->s_id);
90 		sb->s_flags |= MS_RDONLY;
91 	}
92 
93 	/* nothing is done for continue beyond marking the superblock dirty */
94 }
95 
96 void jfs_error(struct super_block *sb, const char *fmt, ...)
97 {
98 	struct va_format vaf;
99 	va_list args;
100 
101 	va_start(args, fmt);
102 
103 	vaf.fmt = fmt;
104 	vaf.va = &args;
105 
106 	pr_err("ERROR: (device %s): %pf: %pV\n",
107 	       sb->s_id, __builtin_return_address(0), &vaf);
108 
109 	va_end(args);
110 
111 	jfs_handle_error(sb);
112 }
113 
114 static struct inode *jfs_alloc_inode(struct super_block *sb)
115 {
116 	struct jfs_inode_info *jfs_inode;
117 
118 	jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
119 	if (!jfs_inode)
120 		return NULL;
121 	return &jfs_inode->vfs_inode;
122 }
123 
124 static void jfs_i_callback(struct rcu_head *head)
125 {
126 	struct inode *inode = container_of(head, struct inode, i_rcu);
127 	struct jfs_inode_info *ji = JFS_IP(inode);
128 	kmem_cache_free(jfs_inode_cachep, ji);
129 }
130 
131 static void jfs_destroy_inode(struct inode *inode)
132 {
133 	struct jfs_inode_info *ji = JFS_IP(inode);
134 
135 	BUG_ON(!list_empty(&ji->anon_inode_list));
136 
137 	spin_lock_irq(&ji->ag_lock);
138 	if (ji->active_ag != -1) {
139 		struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
140 		atomic_dec(&bmap->db_active[ji->active_ag]);
141 		ji->active_ag = -1;
142 	}
143 	spin_unlock_irq(&ji->ag_lock);
144 	call_rcu(&inode->i_rcu, jfs_i_callback);
145 }
146 
147 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
148 {
149 	struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
150 	s64 maxinodes;
151 	struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
152 
153 	jfs_info("In jfs_statfs");
154 	buf->f_type = JFS_SUPER_MAGIC;
155 	buf->f_bsize = sbi->bsize;
156 	buf->f_blocks = sbi->bmap->db_mapsize;
157 	buf->f_bfree = sbi->bmap->db_nfree;
158 	buf->f_bavail = sbi->bmap->db_nfree;
159 	/*
160 	 * If we really return the number of allocated & free inodes, some
161 	 * applications will fail because they won't see enough free inodes.
162 	 * We'll try to calculate some guess as to how many inodes we can
163 	 * really allocate
164 	 *
165 	 * buf->f_files = atomic_read(&imap->im_numinos);
166 	 * buf->f_ffree = atomic_read(&imap->im_numfree);
167 	 */
168 	maxinodes = min((s64) atomic_read(&imap->im_numinos) +
169 			((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
170 			 << L2INOSPEREXT), (s64) 0xffffffffLL);
171 	buf->f_files = maxinodes;
172 	buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
173 				    atomic_read(&imap->im_numfree));
174 	buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
175 	buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
176 					sizeof(sbi->uuid)/2);
177 
178 	buf->f_namelen = JFS_NAME_MAX;
179 	return 0;
180 }
181 
182 static void jfs_put_super(struct super_block *sb)
183 {
184 	struct jfs_sb_info *sbi = JFS_SBI(sb);
185 	int rc;
186 
187 	jfs_info("In jfs_put_super");
188 
189 	dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
190 
191 	rc = jfs_umount(sb);
192 	if (rc)
193 		jfs_err("jfs_umount failed with return code %d", rc);
194 
195 	unload_nls(sbi->nls_tab);
196 
197 	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
198 	iput(sbi->direct_inode);
199 
200 	kfree(sbi);
201 }
202 
203 enum {
204 	Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
205 	Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
206 	Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
207 	Opt_discard, Opt_nodiscard, Opt_discard_minblk
208 };
209 
210 static const match_table_t tokens = {
211 	{Opt_integrity, "integrity"},
212 	{Opt_nointegrity, "nointegrity"},
213 	{Opt_iocharset, "iocharset=%s"},
214 	{Opt_resize, "resize=%u"},
215 	{Opt_resize_nosize, "resize"},
216 	{Opt_errors, "errors=%s"},
217 	{Opt_ignore, "noquota"},
218 	{Opt_ignore, "quota"},
219 	{Opt_usrquota, "usrquota"},
220 	{Opt_grpquota, "grpquota"},
221 	{Opt_uid, "uid=%u"},
222 	{Opt_gid, "gid=%u"},
223 	{Opt_umask, "umask=%u"},
224 	{Opt_discard, "discard"},
225 	{Opt_nodiscard, "nodiscard"},
226 	{Opt_discard_minblk, "discard=%u"},
227 	{Opt_err, NULL}
228 };
229 
230 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
231 			 int *flag)
232 {
233 	void *nls_map = (void *)-1;	/* -1: no change;  NULL: none */
234 	char *p;
235 	struct jfs_sb_info *sbi = JFS_SBI(sb);
236 
237 	*newLVSize = 0;
238 
239 	if (!options)
240 		return 1;
241 
242 	while ((p = strsep(&options, ",")) != NULL) {
243 		substring_t args[MAX_OPT_ARGS];
244 		int token;
245 		if (!*p)
246 			continue;
247 
248 		token = match_token(p, tokens, args);
249 		switch (token) {
250 		case Opt_integrity:
251 			*flag &= ~JFS_NOINTEGRITY;
252 			break;
253 		case Opt_nointegrity:
254 			*flag |= JFS_NOINTEGRITY;
255 			break;
256 		case Opt_ignore:
257 			/* Silently ignore the quota options */
258 			/* Don't do anything ;-) */
259 			break;
260 		case Opt_iocharset:
261 			if (nls_map && nls_map != (void *) -1)
262 				unload_nls(nls_map);
263 			if (!strcmp(args[0].from, "none"))
264 				nls_map = NULL;
265 			else {
266 				nls_map = load_nls(args[0].from);
267 				if (!nls_map) {
268 					pr_err("JFS: charset not found\n");
269 					goto cleanup;
270 				}
271 			}
272 			break;
273 		case Opt_resize:
274 		{
275 			char *resize = args[0].from;
276 			*newLVSize = simple_strtoull(resize, &resize, 0);
277 			break;
278 		}
279 		case Opt_resize_nosize:
280 		{
281 			*newLVSize = sb->s_bdev->bd_inode->i_size >>
282 				sb->s_blocksize_bits;
283 			if (*newLVSize == 0)
284 				pr_err("JFS: Cannot determine volume size\n");
285 			break;
286 		}
287 		case Opt_errors:
288 		{
289 			char *errors = args[0].from;
290 			if (!errors || !*errors)
291 				goto cleanup;
292 			if (!strcmp(errors, "continue")) {
293 				*flag &= ~JFS_ERR_REMOUNT_RO;
294 				*flag &= ~JFS_ERR_PANIC;
295 				*flag |= JFS_ERR_CONTINUE;
296 			} else if (!strcmp(errors, "remount-ro")) {
297 				*flag &= ~JFS_ERR_CONTINUE;
298 				*flag &= ~JFS_ERR_PANIC;
299 				*flag |= JFS_ERR_REMOUNT_RO;
300 			} else if (!strcmp(errors, "panic")) {
301 				*flag &= ~JFS_ERR_CONTINUE;
302 				*flag &= ~JFS_ERR_REMOUNT_RO;
303 				*flag |= JFS_ERR_PANIC;
304 			} else {
305 				pr_err("JFS: %s is an invalid error handler\n",
306 				       errors);
307 				goto cleanup;
308 			}
309 			break;
310 		}
311 
312 #ifdef CONFIG_QUOTA
313 		case Opt_quota:
314 		case Opt_usrquota:
315 			*flag |= JFS_USRQUOTA;
316 			break;
317 		case Opt_grpquota:
318 			*flag |= JFS_GRPQUOTA;
319 			break;
320 #else
321 		case Opt_usrquota:
322 		case Opt_grpquota:
323 		case Opt_quota:
324 			pr_err("JFS: quota operations not supported\n");
325 			break;
326 #endif
327 		case Opt_uid:
328 		{
329 			char *uid = args[0].from;
330 			uid_t val = simple_strtoul(uid, &uid, 0);
331 			sbi->uid = make_kuid(current_user_ns(), val);
332 			if (!uid_valid(sbi->uid))
333 				goto cleanup;
334 			break;
335 		}
336 
337 		case Opt_gid:
338 		{
339 			char *gid = args[0].from;
340 			gid_t val = simple_strtoul(gid, &gid, 0);
341 			sbi->gid = make_kgid(current_user_ns(), val);
342 			if (!gid_valid(sbi->gid))
343 				goto cleanup;
344 			break;
345 		}
346 
347 		case Opt_umask:
348 		{
349 			char *umask = args[0].from;
350 			sbi->umask = simple_strtoul(umask, &umask, 8);
351 			if (sbi->umask & ~0777) {
352 				pr_err("JFS: Invalid value of umask\n");
353 				goto cleanup;
354 			}
355 			break;
356 		}
357 
358 		case Opt_discard:
359 		{
360 			struct request_queue *q = bdev_get_queue(sb->s_bdev);
361 			/* if set to 1, even copying files will cause
362 			 * trimming :O
363 			 * -> user has more control over the online trimming
364 			 */
365 			sbi->minblks_trim = 64;
366 			if (blk_queue_discard(q)) {
367 				*flag |= JFS_DISCARD;
368 			} else {
369 				pr_err("JFS: discard option " \
370 					"not supported on device\n");
371 			}
372 			break;
373 		}
374 
375 		case Opt_nodiscard:
376 			*flag &= ~JFS_DISCARD;
377 			break;
378 
379 		case Opt_discard_minblk:
380 		{
381 			struct request_queue *q = bdev_get_queue(sb->s_bdev);
382 			char *minblks_trim = args[0].from;
383 			if (blk_queue_discard(q)) {
384 				*flag |= JFS_DISCARD;
385 				sbi->minblks_trim = simple_strtoull(
386 					minblks_trim, &minblks_trim, 0);
387 			} else {
388 				pr_err("JFS: discard option " \
389 					"not supported on device\n");
390 			}
391 			break;
392 		}
393 
394 		default:
395 			printk("jfs: Unrecognized mount option \"%s\" "
396 					" or missing value\n", p);
397 			goto cleanup;
398 		}
399 	}
400 
401 	if (nls_map != (void *) -1) {
402 		/* Discard old (if remount) */
403 		unload_nls(sbi->nls_tab);
404 		sbi->nls_tab = nls_map;
405 	}
406 	return 1;
407 
408 cleanup:
409 	if (nls_map && nls_map != (void *) -1)
410 		unload_nls(nls_map);
411 	return 0;
412 }
413 
414 static int jfs_remount(struct super_block *sb, int *flags, char *data)
415 {
416 	s64 newLVSize = 0;
417 	int rc = 0;
418 	int flag = JFS_SBI(sb)->flag;
419 	int ret;
420 
421 	sync_filesystem(sb);
422 	if (!parse_options(data, sb, &newLVSize, &flag)) {
423 		return -EINVAL;
424 	}
425 
426 	if (newLVSize) {
427 		if (sb->s_flags & MS_RDONLY) {
428 			pr_err("JFS: resize requires volume" \
429 				" to be mounted read-write\n");
430 			return -EROFS;
431 		}
432 		rc = jfs_extendfs(sb, newLVSize, 0);
433 		if (rc)
434 			return rc;
435 	}
436 
437 	if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
438 		/*
439 		 * Invalidate any previously read metadata.  fsck may have
440 		 * changed the on-disk data since we mounted r/o
441 		 */
442 		truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
443 
444 		JFS_SBI(sb)->flag = flag;
445 		ret = jfs_mount_rw(sb, 1);
446 
447 		/* mark the fs r/w for quota activity */
448 		sb->s_flags &= ~MS_RDONLY;
449 
450 		dquot_resume(sb, -1);
451 		return ret;
452 	}
453 	if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
454 		rc = dquot_suspend(sb, -1);
455 		if (rc < 0) {
456 			return rc;
457 		}
458 		rc = jfs_umount_rw(sb);
459 		JFS_SBI(sb)->flag = flag;
460 		return rc;
461 	}
462 	if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
463 		if (!(sb->s_flags & MS_RDONLY)) {
464 			rc = jfs_umount_rw(sb);
465 			if (rc)
466 				return rc;
467 
468 			JFS_SBI(sb)->flag = flag;
469 			ret = jfs_mount_rw(sb, 1);
470 			return ret;
471 		}
472 	JFS_SBI(sb)->flag = flag;
473 
474 	return 0;
475 }
476 
477 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
478 {
479 	struct jfs_sb_info *sbi;
480 	struct inode *inode;
481 	int rc;
482 	s64 newLVSize = 0;
483 	int flag, ret = -EINVAL;
484 
485 	jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
486 
487 	if (!new_valid_dev(sb->s_bdev->bd_dev))
488 		return -EOVERFLOW;
489 
490 	sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
491 	if (!sbi)
492 		return -ENOMEM;
493 
494 	sb->s_fs_info = sbi;
495 	sb->s_max_links = JFS_LINK_MAX;
496 	sbi->sb = sb;
497 	sbi->uid = INVALID_UID;
498 	sbi->gid = INVALID_GID;
499 	sbi->umask = -1;
500 
501 	/* initialize the mount flag and determine the default error handler */
502 	flag = JFS_ERR_REMOUNT_RO;
503 
504 	if (!parse_options((char *) data, sb, &newLVSize, &flag))
505 		goto out_kfree;
506 	sbi->flag = flag;
507 
508 #ifdef CONFIG_JFS_POSIX_ACL
509 	sb->s_flags |= MS_POSIXACL;
510 #endif
511 
512 	if (newLVSize) {
513 		pr_err("resize option for remount only\n");
514 		goto out_kfree;
515 	}
516 
517 	/*
518 	 * Initialize blocksize to 4K.
519 	 */
520 	sb_set_blocksize(sb, PSIZE);
521 
522 	/*
523 	 * Set method vectors.
524 	 */
525 	sb->s_op = &jfs_super_operations;
526 	sb->s_export_op = &jfs_export_operations;
527 	sb->s_xattr = jfs_xattr_handlers;
528 #ifdef CONFIG_QUOTA
529 	sb->dq_op = &dquot_operations;
530 	sb->s_qcop = &dquot_quotactl_ops;
531 #endif
532 
533 	/*
534 	 * Initialize direct-mapping inode/address-space
535 	 */
536 	inode = new_inode(sb);
537 	if (inode == NULL) {
538 		ret = -ENOMEM;
539 		goto out_unload;
540 	}
541 	inode->i_ino = 0;
542 	inode->i_size = sb->s_bdev->bd_inode->i_size;
543 	inode->i_mapping->a_ops = &jfs_metapage_aops;
544 	insert_inode_hash(inode);
545 	mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
546 
547 	sbi->direct_inode = inode;
548 
549 	rc = jfs_mount(sb);
550 	if (rc) {
551 		if (!silent) {
552 			jfs_err("jfs_mount failed w/return code = %d", rc);
553 		}
554 		goto out_mount_failed;
555 	}
556 	if (sb->s_flags & MS_RDONLY)
557 		sbi->log = NULL;
558 	else {
559 		rc = jfs_mount_rw(sb, 0);
560 		if (rc) {
561 			if (!silent) {
562 				jfs_err("jfs_mount_rw failed, return code = %d",
563 					rc);
564 			}
565 			goto out_no_rw;
566 		}
567 	}
568 
569 	sb->s_magic = JFS_SUPER_MAGIC;
570 
571 	if (sbi->mntflag & JFS_OS2)
572 		sb->s_d_op = &jfs_ci_dentry_operations;
573 
574 	inode = jfs_iget(sb, ROOT_I);
575 	if (IS_ERR(inode)) {
576 		ret = PTR_ERR(inode);
577 		goto out_no_rw;
578 	}
579 	sb->s_root = d_make_root(inode);
580 	if (!sb->s_root)
581 		goto out_no_root;
582 
583 	/* logical blocks are represented by 40 bits in pxd_t, etc. */
584 	sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
585 #if BITS_PER_LONG == 32
586 	/*
587 	 * Page cache is indexed by long.
588 	 * I would use MAX_LFS_FILESIZE, but it's only half as big
589 	 */
590 	sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
591 #endif
592 	sb->s_time_gran = 1;
593 	return 0;
594 
595 out_no_root:
596 	jfs_err("jfs_read_super: get root dentry failed");
597 
598 out_no_rw:
599 	rc = jfs_umount(sb);
600 	if (rc) {
601 		jfs_err("jfs_umount failed with return code %d", rc);
602 	}
603 out_mount_failed:
604 	filemap_write_and_wait(sbi->direct_inode->i_mapping);
605 	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
606 	make_bad_inode(sbi->direct_inode);
607 	iput(sbi->direct_inode);
608 	sbi->direct_inode = NULL;
609 out_unload:
610 	if (sbi->nls_tab)
611 		unload_nls(sbi->nls_tab);
612 out_kfree:
613 	kfree(sbi);
614 	return ret;
615 }
616 
617 static int jfs_freeze(struct super_block *sb)
618 {
619 	struct jfs_sb_info *sbi = JFS_SBI(sb);
620 	struct jfs_log *log = sbi->log;
621 	int rc = 0;
622 
623 	if (!(sb->s_flags & MS_RDONLY)) {
624 		txQuiesce(sb);
625 		rc = lmLogShutdown(log);
626 		if (rc) {
627 			jfs_error(sb, "lmLogShutdown failed\n");
628 
629 			/* let operations fail rather than hang */
630 			txResume(sb);
631 
632 			return rc;
633 		}
634 		rc = updateSuper(sb, FM_CLEAN);
635 		if (rc) {
636 			jfs_err("jfs_freeze: updateSuper failed\n");
637 			/*
638 			 * Don't fail here. Everything succeeded except
639 			 * marking the superblock clean, so there's really
640 			 * no harm in leaving it frozen for now.
641 			 */
642 		}
643 	}
644 	return 0;
645 }
646 
647 static int jfs_unfreeze(struct super_block *sb)
648 {
649 	struct jfs_sb_info *sbi = JFS_SBI(sb);
650 	struct jfs_log *log = sbi->log;
651 	int rc = 0;
652 
653 	if (!(sb->s_flags & MS_RDONLY)) {
654 		rc = updateSuper(sb, FM_MOUNT);
655 		if (rc) {
656 			jfs_error(sb, "updateSuper failed\n");
657 			goto out;
658 		}
659 		rc = lmLogInit(log);
660 		if (rc)
661 			jfs_error(sb, "lmLogInit failed\n");
662 out:
663 		txResume(sb);
664 	}
665 	return rc;
666 }
667 
668 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
669 	int flags, const char *dev_name, void *data)
670 {
671 	return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
672 }
673 
674 static int jfs_sync_fs(struct super_block *sb, int wait)
675 {
676 	struct jfs_log *log = JFS_SBI(sb)->log;
677 
678 	/* log == NULL indicates read-only mount */
679 	if (log) {
680 		/*
681 		 * Write quota structures to quota file, sync_blockdev() will
682 		 * write them to disk later
683 		 */
684 		dquot_writeback_dquots(sb, -1);
685 		jfs_flush_journal(log, wait);
686 		jfs_syncpt(log, 0);
687 	}
688 
689 	return 0;
690 }
691 
692 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
693 {
694 	struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
695 
696 	if (uid_valid(sbi->uid))
697 		seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
698 	if (gid_valid(sbi->gid))
699 		seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
700 	if (sbi->umask != -1)
701 		seq_printf(seq, ",umask=%03o", sbi->umask);
702 	if (sbi->flag & JFS_NOINTEGRITY)
703 		seq_puts(seq, ",nointegrity");
704 	if (sbi->flag & JFS_DISCARD)
705 		seq_printf(seq, ",discard=%u", sbi->minblks_trim);
706 	if (sbi->nls_tab)
707 		seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
708 	if (sbi->flag & JFS_ERR_CONTINUE)
709 		seq_printf(seq, ",errors=continue");
710 	if (sbi->flag & JFS_ERR_PANIC)
711 		seq_printf(seq, ",errors=panic");
712 
713 #ifdef CONFIG_QUOTA
714 	if (sbi->flag & JFS_USRQUOTA)
715 		seq_puts(seq, ",usrquota");
716 
717 	if (sbi->flag & JFS_GRPQUOTA)
718 		seq_puts(seq, ",grpquota");
719 #endif
720 
721 	return 0;
722 }
723 
724 #ifdef CONFIG_QUOTA
725 
726 /* Read data from quotafile - avoid pagecache and such because we cannot afford
727  * acquiring the locks... As quota files are never truncated and quota code
728  * itself serializes the operations (and no one else should touch the files)
729  * we don't have to be afraid of races */
730 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
731 			      size_t len, loff_t off)
732 {
733 	struct inode *inode = sb_dqopt(sb)->files[type];
734 	sector_t blk = off >> sb->s_blocksize_bits;
735 	int err = 0;
736 	int offset = off & (sb->s_blocksize - 1);
737 	int tocopy;
738 	size_t toread;
739 	struct buffer_head tmp_bh;
740 	struct buffer_head *bh;
741 	loff_t i_size = i_size_read(inode);
742 
743 	if (off > i_size)
744 		return 0;
745 	if (off+len > i_size)
746 		len = i_size-off;
747 	toread = len;
748 	while (toread > 0) {
749 		tocopy = sb->s_blocksize - offset < toread ?
750 				sb->s_blocksize - offset : toread;
751 
752 		tmp_bh.b_state = 0;
753 		tmp_bh.b_size = 1 << inode->i_blkbits;
754 		err = jfs_get_block(inode, blk, &tmp_bh, 0);
755 		if (err)
756 			return err;
757 		if (!buffer_mapped(&tmp_bh))	/* A hole? */
758 			memset(data, 0, tocopy);
759 		else {
760 			bh = sb_bread(sb, tmp_bh.b_blocknr);
761 			if (!bh)
762 				return -EIO;
763 			memcpy(data, bh->b_data+offset, tocopy);
764 			brelse(bh);
765 		}
766 		offset = 0;
767 		toread -= tocopy;
768 		data += tocopy;
769 		blk++;
770 	}
771 	return len;
772 }
773 
774 /* Write to quotafile */
775 static ssize_t jfs_quota_write(struct super_block *sb, int type,
776 			       const char *data, size_t len, loff_t off)
777 {
778 	struct inode *inode = sb_dqopt(sb)->files[type];
779 	sector_t blk = off >> sb->s_blocksize_bits;
780 	int err = 0;
781 	int offset = off & (sb->s_blocksize - 1);
782 	int tocopy;
783 	size_t towrite = len;
784 	struct buffer_head tmp_bh;
785 	struct buffer_head *bh;
786 
787 	mutex_lock(&inode->i_mutex);
788 	while (towrite > 0) {
789 		tocopy = sb->s_blocksize - offset < towrite ?
790 				sb->s_blocksize - offset : towrite;
791 
792 		tmp_bh.b_state = 0;
793 		tmp_bh.b_size = 1 << inode->i_blkbits;
794 		err = jfs_get_block(inode, blk, &tmp_bh, 1);
795 		if (err)
796 			goto out;
797 		if (offset || tocopy != sb->s_blocksize)
798 			bh = sb_bread(sb, tmp_bh.b_blocknr);
799 		else
800 			bh = sb_getblk(sb, tmp_bh.b_blocknr);
801 		if (!bh) {
802 			err = -EIO;
803 			goto out;
804 		}
805 		lock_buffer(bh);
806 		memcpy(bh->b_data+offset, data, tocopy);
807 		flush_dcache_page(bh->b_page);
808 		set_buffer_uptodate(bh);
809 		mark_buffer_dirty(bh);
810 		unlock_buffer(bh);
811 		brelse(bh);
812 		offset = 0;
813 		towrite -= tocopy;
814 		data += tocopy;
815 		blk++;
816 	}
817 out:
818 	if (len == towrite) {
819 		mutex_unlock(&inode->i_mutex);
820 		return err;
821 	}
822 	if (inode->i_size < off+len-towrite)
823 		i_size_write(inode, off+len-towrite);
824 	inode->i_version++;
825 	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
826 	mark_inode_dirty(inode);
827 	mutex_unlock(&inode->i_mutex);
828 	return len - towrite;
829 }
830 
831 #endif
832 
833 static const struct super_operations jfs_super_operations = {
834 	.alloc_inode	= jfs_alloc_inode,
835 	.destroy_inode	= jfs_destroy_inode,
836 	.dirty_inode	= jfs_dirty_inode,
837 	.write_inode	= jfs_write_inode,
838 	.evict_inode	= jfs_evict_inode,
839 	.put_super	= jfs_put_super,
840 	.sync_fs	= jfs_sync_fs,
841 	.freeze_fs	= jfs_freeze,
842 	.unfreeze_fs	= jfs_unfreeze,
843 	.statfs		= jfs_statfs,
844 	.remount_fs	= jfs_remount,
845 	.show_options	= jfs_show_options,
846 #ifdef CONFIG_QUOTA
847 	.quota_read	= jfs_quota_read,
848 	.quota_write	= jfs_quota_write,
849 #endif
850 };
851 
852 static const struct export_operations jfs_export_operations = {
853 	.fh_to_dentry	= jfs_fh_to_dentry,
854 	.fh_to_parent	= jfs_fh_to_parent,
855 	.get_parent	= jfs_get_parent,
856 };
857 
858 static struct file_system_type jfs_fs_type = {
859 	.owner		= THIS_MODULE,
860 	.name		= "jfs",
861 	.mount		= jfs_do_mount,
862 	.kill_sb	= kill_block_super,
863 	.fs_flags	= FS_REQUIRES_DEV,
864 };
865 MODULE_ALIAS_FS("jfs");
866 
867 static void init_once(void *foo)
868 {
869 	struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
870 
871 	memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
872 	INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
873 	init_rwsem(&jfs_ip->rdwrlock);
874 	mutex_init(&jfs_ip->commit_mutex);
875 	init_rwsem(&jfs_ip->xattr_sem);
876 	spin_lock_init(&jfs_ip->ag_lock);
877 	jfs_ip->active_ag = -1;
878 	inode_init_once(&jfs_ip->vfs_inode);
879 }
880 
881 static int __init init_jfs_fs(void)
882 {
883 	int i;
884 	int rc;
885 
886 	jfs_inode_cachep =
887 	    kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
888 			    SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
889 			    init_once);
890 	if (jfs_inode_cachep == NULL)
891 		return -ENOMEM;
892 
893 	/*
894 	 * Metapage initialization
895 	 */
896 	rc = metapage_init();
897 	if (rc) {
898 		jfs_err("metapage_init failed w/rc = %d", rc);
899 		goto free_slab;
900 	}
901 
902 	/*
903 	 * Transaction Manager initialization
904 	 */
905 	rc = txInit();
906 	if (rc) {
907 		jfs_err("txInit failed w/rc = %d", rc);
908 		goto free_metapage;
909 	}
910 
911 	/*
912 	 * I/O completion thread (endio)
913 	 */
914 	jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
915 	if (IS_ERR(jfsIOthread)) {
916 		rc = PTR_ERR(jfsIOthread);
917 		jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
918 		goto end_txmngr;
919 	}
920 
921 	if (commit_threads < 1)
922 		commit_threads = num_online_cpus();
923 	if (commit_threads > MAX_COMMIT_THREADS)
924 		commit_threads = MAX_COMMIT_THREADS;
925 
926 	for (i = 0; i < commit_threads; i++) {
927 		jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
928 		if (IS_ERR(jfsCommitThread[i])) {
929 			rc = PTR_ERR(jfsCommitThread[i]);
930 			jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
931 			commit_threads = i;
932 			goto kill_committask;
933 		}
934 	}
935 
936 	jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
937 	if (IS_ERR(jfsSyncThread)) {
938 		rc = PTR_ERR(jfsSyncThread);
939 		jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
940 		goto kill_committask;
941 	}
942 
943 #ifdef PROC_FS_JFS
944 	jfs_proc_init();
945 #endif
946 
947 	rc = register_filesystem(&jfs_fs_type);
948 	if (!rc)
949 		return 0;
950 
951 #ifdef PROC_FS_JFS
952 	jfs_proc_clean();
953 #endif
954 	kthread_stop(jfsSyncThread);
955 kill_committask:
956 	for (i = 0; i < commit_threads; i++)
957 		kthread_stop(jfsCommitThread[i]);
958 	kthread_stop(jfsIOthread);
959 end_txmngr:
960 	txExit();
961 free_metapage:
962 	metapage_exit();
963 free_slab:
964 	kmem_cache_destroy(jfs_inode_cachep);
965 	return rc;
966 }
967 
968 static void __exit exit_jfs_fs(void)
969 {
970 	int i;
971 
972 	jfs_info("exit_jfs_fs called");
973 
974 	txExit();
975 	metapage_exit();
976 
977 	kthread_stop(jfsIOthread);
978 	for (i = 0; i < commit_threads; i++)
979 		kthread_stop(jfsCommitThread[i]);
980 	kthread_stop(jfsSyncThread);
981 #ifdef PROC_FS_JFS
982 	jfs_proc_clean();
983 #endif
984 	unregister_filesystem(&jfs_fs_type);
985 
986 	/*
987 	 * Make sure all delayed rcu free inodes are flushed before we
988 	 * destroy cache.
989 	 */
990 	rcu_barrier();
991 	kmem_cache_destroy(jfs_inode_cachep);
992 }
993 
994 module_init(init_jfs_fs)
995 module_exit(exit_jfs_fs)
996