1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *   Copyright (C) International Business Machines Corp., 2000-2004
4  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
5  */
6 
7 #include <linux/fs.h>
8 #include <linux/module.h>
9 #include <linux/parser.h>
10 #include <linux/completion.h>
11 #include <linux/vfs.h>
12 #include <linux/quotaops.h>
13 #include <linux/mount.h>
14 #include <linux/moduleparam.h>
15 #include <linux/kthread.h>
16 #include <linux/posix_acl.h>
17 #include <linux/buffer_head.h>
18 #include <linux/exportfs.h>
19 #include <linux/crc32.h>
20 #include <linux/slab.h>
21 #include <linux/uaccess.h>
22 #include <linux/seq_file.h>
23 #include <linux/blkdev.h>
24 
25 #include "jfs_incore.h"
26 #include "jfs_filsys.h"
27 #include "jfs_inode.h"
28 #include "jfs_metapage.h"
29 #include "jfs_superblock.h"
30 #include "jfs_dmap.h"
31 #include "jfs_imap.h"
32 #include "jfs_acl.h"
33 #include "jfs_debug.h"
34 #include "jfs_xattr.h"
35 #include "jfs_dinode.h"
36 
37 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
38 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
39 MODULE_LICENSE("GPL");
40 
41 static struct kmem_cache *jfs_inode_cachep;
42 
43 static const struct super_operations jfs_super_operations;
44 static const struct export_operations jfs_export_operations;
45 static struct file_system_type jfs_fs_type;
46 
47 #define MAX_COMMIT_THREADS 64
48 static int commit_threads;
49 module_param(commit_threads, int, 0);
50 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
51 
52 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
53 struct task_struct *jfsIOthread;
54 struct task_struct *jfsSyncThread;
55 
56 #ifdef CONFIG_JFS_DEBUG
57 int jfsloglevel = JFS_LOGLEVEL_WARN;
58 module_param(jfsloglevel, int, 0644);
59 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
60 #endif
61 
jfs_handle_error(struct super_block * sb)62 static void jfs_handle_error(struct super_block *sb)
63 {
64 	struct jfs_sb_info *sbi = JFS_SBI(sb);
65 
66 	if (sb_rdonly(sb))
67 		return;
68 
69 	updateSuper(sb, FM_DIRTY);
70 
71 	if (sbi->flag & JFS_ERR_PANIC)
72 		panic("JFS (device %s): panic forced after error\n",
73 			sb->s_id);
74 	else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
75 		jfs_err("ERROR: (device %s): remounting filesystem as read-only",
76 			sb->s_id);
77 		sb->s_flags |= SB_RDONLY;
78 	}
79 
80 	/* nothing is done for continue beyond marking the superblock dirty */
81 }
82 
jfs_error(struct super_block * sb,const char * fmt,...)83 void jfs_error(struct super_block *sb, const char *fmt, ...)
84 {
85 	struct va_format vaf;
86 	va_list args;
87 
88 	va_start(args, fmt);
89 
90 	vaf.fmt = fmt;
91 	vaf.va = &args;
92 
93 	pr_err("ERROR: (device %s): %ps: %pV\n",
94 	       sb->s_id, __builtin_return_address(0), &vaf);
95 
96 	va_end(args);
97 
98 	jfs_handle_error(sb);
99 }
100 
jfs_alloc_inode(struct super_block * sb)101 static struct inode *jfs_alloc_inode(struct super_block *sb)
102 {
103 	struct jfs_inode_info *jfs_inode;
104 
105 	jfs_inode = alloc_inode_sb(sb, jfs_inode_cachep, GFP_NOFS);
106 	if (!jfs_inode)
107 		return NULL;
108 #ifdef CONFIG_QUOTA
109 	memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot));
110 #endif
111 	return &jfs_inode->vfs_inode;
112 }
113 
jfs_free_inode(struct inode * inode)114 static void jfs_free_inode(struct inode *inode)
115 {
116 	kmem_cache_free(jfs_inode_cachep, JFS_IP(inode));
117 }
118 
jfs_statfs(struct dentry * dentry,struct kstatfs * buf)119 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
120 {
121 	struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
122 	s64 maxinodes;
123 	struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
124 
125 	jfs_info("In jfs_statfs");
126 	buf->f_type = JFS_SUPER_MAGIC;
127 	buf->f_bsize = sbi->bsize;
128 	buf->f_blocks = sbi->bmap->db_mapsize;
129 	buf->f_bfree = sbi->bmap->db_nfree;
130 	buf->f_bavail = sbi->bmap->db_nfree;
131 	/*
132 	 * If we really return the number of allocated & free inodes, some
133 	 * applications will fail because they won't see enough free inodes.
134 	 * We'll try to calculate some guess as to how many inodes we can
135 	 * really allocate
136 	 *
137 	 * buf->f_files = atomic_read(&imap->im_numinos);
138 	 * buf->f_ffree = atomic_read(&imap->im_numfree);
139 	 */
140 	maxinodes = min((s64) atomic_read(&imap->im_numinos) +
141 			((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
142 			 << L2INOSPEREXT), (s64) 0xffffffffLL);
143 	buf->f_files = maxinodes;
144 	buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
145 				    atomic_read(&imap->im_numfree));
146 	buf->f_fsid.val[0] = crc32_le(0, (char *)&sbi->uuid,
147 				      sizeof(sbi->uuid)/2);
148 	buf->f_fsid.val[1] = crc32_le(0,
149 				      (char *)&sbi->uuid + sizeof(sbi->uuid)/2,
150 				      sizeof(sbi->uuid)/2);
151 
152 	buf->f_namelen = JFS_NAME_MAX;
153 	return 0;
154 }
155 
156 #ifdef CONFIG_QUOTA
157 static int jfs_quota_off(struct super_block *sb, int type);
158 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
159 			const struct path *path);
160 
jfs_quota_off_umount(struct super_block * sb)161 static void jfs_quota_off_umount(struct super_block *sb)
162 {
163 	int type;
164 
165 	for (type = 0; type < MAXQUOTAS; type++)
166 		jfs_quota_off(sb, type);
167 }
168 
169 static const struct quotactl_ops jfs_quotactl_ops = {
170 	.quota_on	= jfs_quota_on,
171 	.quota_off	= jfs_quota_off,
172 	.quota_sync	= dquot_quota_sync,
173 	.get_state	= dquot_get_state,
174 	.set_info	= dquot_set_dqinfo,
175 	.get_dqblk	= dquot_get_dqblk,
176 	.set_dqblk	= dquot_set_dqblk,
177 	.get_nextdqblk	= dquot_get_next_dqblk,
178 };
179 #else
jfs_quota_off_umount(struct super_block * sb)180 static inline void jfs_quota_off_umount(struct super_block *sb)
181 {
182 }
183 #endif
184 
jfs_put_super(struct super_block * sb)185 static void jfs_put_super(struct super_block *sb)
186 {
187 	struct jfs_sb_info *sbi = JFS_SBI(sb);
188 	int rc;
189 
190 	jfs_info("In jfs_put_super");
191 
192 	jfs_quota_off_umount(sb);
193 
194 	rc = jfs_umount(sb);
195 	if (rc)
196 		jfs_err("jfs_umount failed with return code %d", rc);
197 
198 	unload_nls(sbi->nls_tab);
199 
200 	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
201 	iput(sbi->direct_inode);
202 
203 	kfree(sbi);
204 }
205 
206 enum {
207 	Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
208 	Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
209 	Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
210 	Opt_discard, Opt_nodiscard, Opt_discard_minblk
211 };
212 
213 static const match_table_t tokens = {
214 	{Opt_integrity, "integrity"},
215 	{Opt_nointegrity, "nointegrity"},
216 	{Opt_iocharset, "iocharset=%s"},
217 	{Opt_resize, "resize=%u"},
218 	{Opt_resize_nosize, "resize"},
219 	{Opt_errors, "errors=%s"},
220 	{Opt_ignore, "noquota"},
221 	{Opt_quota, "quota"},
222 	{Opt_usrquota, "usrquota"},
223 	{Opt_grpquota, "grpquota"},
224 	{Opt_uid, "uid=%u"},
225 	{Opt_gid, "gid=%u"},
226 	{Opt_umask, "umask=%u"},
227 	{Opt_discard, "discard"},
228 	{Opt_nodiscard, "nodiscard"},
229 	{Opt_discard_minblk, "discard=%u"},
230 	{Opt_err, NULL}
231 };
232 
parse_options(char * options,struct super_block * sb,s64 * newLVSize,int * flag)233 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
234 			 int *flag)
235 {
236 	void *nls_map = (void *)-1;	/* -1: no change;  NULL: none */
237 	char *p;
238 	struct jfs_sb_info *sbi = JFS_SBI(sb);
239 
240 	*newLVSize = 0;
241 
242 	if (!options)
243 		return 1;
244 
245 	while ((p = strsep(&options, ",")) != NULL) {
246 		substring_t args[MAX_OPT_ARGS];
247 		int token;
248 		if (!*p)
249 			continue;
250 
251 		token = match_token(p, tokens, args);
252 		switch (token) {
253 		case Opt_integrity:
254 			*flag &= ~JFS_NOINTEGRITY;
255 			break;
256 		case Opt_nointegrity:
257 			*flag |= JFS_NOINTEGRITY;
258 			break;
259 		case Opt_ignore:
260 			/* Silently ignore the quota options */
261 			/* Don't do anything ;-) */
262 			break;
263 		case Opt_iocharset:
264 			if (nls_map && nls_map != (void *) -1)
265 				unload_nls(nls_map);
266 			if (!strcmp(args[0].from, "none"))
267 				nls_map = NULL;
268 			else {
269 				nls_map = load_nls(args[0].from);
270 				if (!nls_map) {
271 					pr_err("JFS: charset not found\n");
272 					goto cleanup;
273 				}
274 			}
275 			break;
276 		case Opt_resize:
277 		{
278 			char *resize = args[0].from;
279 			int rc = kstrtoll(resize, 0, newLVSize);
280 
281 			if (rc)
282 				goto cleanup;
283 			break;
284 		}
285 		case Opt_resize_nosize:
286 		{
287 			*newLVSize = sb_bdev_nr_blocks(sb);
288 			if (*newLVSize == 0)
289 				pr_err("JFS: Cannot determine volume size\n");
290 			break;
291 		}
292 		case Opt_errors:
293 		{
294 			char *errors = args[0].from;
295 			if (!errors || !*errors)
296 				goto cleanup;
297 			if (!strcmp(errors, "continue")) {
298 				*flag &= ~JFS_ERR_REMOUNT_RO;
299 				*flag &= ~JFS_ERR_PANIC;
300 				*flag |= JFS_ERR_CONTINUE;
301 			} else if (!strcmp(errors, "remount-ro")) {
302 				*flag &= ~JFS_ERR_CONTINUE;
303 				*flag &= ~JFS_ERR_PANIC;
304 				*flag |= JFS_ERR_REMOUNT_RO;
305 			} else if (!strcmp(errors, "panic")) {
306 				*flag &= ~JFS_ERR_CONTINUE;
307 				*flag &= ~JFS_ERR_REMOUNT_RO;
308 				*flag |= JFS_ERR_PANIC;
309 			} else {
310 				pr_err("JFS: %s is an invalid error handler\n",
311 				       errors);
312 				goto cleanup;
313 			}
314 			break;
315 		}
316 
317 #ifdef CONFIG_QUOTA
318 		case Opt_quota:
319 		case Opt_usrquota:
320 			*flag |= JFS_USRQUOTA;
321 			break;
322 		case Opt_grpquota:
323 			*flag |= JFS_GRPQUOTA;
324 			break;
325 #else
326 		case Opt_usrquota:
327 		case Opt_grpquota:
328 		case Opt_quota:
329 			pr_err("JFS: quota operations not supported\n");
330 			break;
331 #endif
332 		case Opt_uid:
333 		{
334 			char *uid = args[0].from;
335 			uid_t val;
336 			int rc = kstrtouint(uid, 0, &val);
337 
338 			if (rc)
339 				goto cleanup;
340 			sbi->uid = make_kuid(current_user_ns(), val);
341 			if (!uid_valid(sbi->uid))
342 				goto cleanup;
343 			break;
344 		}
345 
346 		case Opt_gid:
347 		{
348 			char *gid = args[0].from;
349 			gid_t val;
350 			int rc = kstrtouint(gid, 0, &val);
351 
352 			if (rc)
353 				goto cleanup;
354 			sbi->gid = make_kgid(current_user_ns(), val);
355 			if (!gid_valid(sbi->gid))
356 				goto cleanup;
357 			break;
358 		}
359 
360 		case Opt_umask:
361 		{
362 			char *umask = args[0].from;
363 			int rc = kstrtouint(umask, 8, &sbi->umask);
364 
365 			if (rc)
366 				goto cleanup;
367 			if (sbi->umask & ~0777) {
368 				pr_err("JFS: Invalid value of umask\n");
369 				goto cleanup;
370 			}
371 			break;
372 		}
373 
374 		case Opt_discard:
375 			/* if set to 1, even copying files will cause
376 			 * trimming :O
377 			 * -> user has more control over the online trimming
378 			 */
379 			sbi->minblks_trim = 64;
380 			if (bdev_max_discard_sectors(sb->s_bdev))
381 				*flag |= JFS_DISCARD;
382 			else
383 				pr_err("JFS: discard option not supported on device\n");
384 			break;
385 
386 		case Opt_nodiscard:
387 			*flag &= ~JFS_DISCARD;
388 			break;
389 
390 		case Opt_discard_minblk:
391 		{
392 			char *minblks_trim = args[0].from;
393 			int rc;
394 			if (bdev_max_discard_sectors(sb->s_bdev)) {
395 				*flag |= JFS_DISCARD;
396 				rc = kstrtouint(minblks_trim, 0,
397 						&sbi->minblks_trim);
398 				if (rc)
399 					goto cleanup;
400 			} else
401 				pr_err("JFS: discard option not supported on device\n");
402 			break;
403 		}
404 
405 		default:
406 			printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
407 			       p);
408 			goto cleanup;
409 		}
410 	}
411 
412 	if (nls_map != (void *) -1) {
413 		/* Discard old (if remount) */
414 		unload_nls(sbi->nls_tab);
415 		sbi->nls_tab = nls_map;
416 	}
417 	return 1;
418 
419 cleanup:
420 	if (nls_map && nls_map != (void *) -1)
421 		unload_nls(nls_map);
422 	return 0;
423 }
424 
jfs_remount(struct super_block * sb,int * flags,char * data)425 static int jfs_remount(struct super_block *sb, int *flags, char *data)
426 {
427 	s64 newLVSize = 0;
428 	int rc = 0;
429 	int flag = JFS_SBI(sb)->flag;
430 	int ret;
431 
432 	sync_filesystem(sb);
433 	if (!parse_options(data, sb, &newLVSize, &flag))
434 		return -EINVAL;
435 
436 	if (newLVSize) {
437 		if (sb_rdonly(sb)) {
438 			pr_err("JFS: resize requires volume to be mounted read-write\n");
439 			return -EROFS;
440 		}
441 		rc = jfs_extendfs(sb, newLVSize, 0);
442 		if (rc)
443 			return rc;
444 	}
445 
446 	if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) {
447 		/*
448 		 * Invalidate any previously read metadata.  fsck may have
449 		 * changed the on-disk data since we mounted r/o
450 		 */
451 		truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
452 
453 		JFS_SBI(sb)->flag = flag;
454 		ret = jfs_mount_rw(sb, 1);
455 
456 		/* mark the fs r/w for quota activity */
457 		sb->s_flags &= ~SB_RDONLY;
458 
459 		dquot_resume(sb, -1);
460 		return ret;
461 	}
462 	if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) {
463 		rc = dquot_suspend(sb, -1);
464 		if (rc < 0)
465 			return rc;
466 		rc = jfs_umount_rw(sb);
467 		JFS_SBI(sb)->flag = flag;
468 		return rc;
469 	}
470 	if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
471 		if (!sb_rdonly(sb)) {
472 			rc = jfs_umount_rw(sb);
473 			if (rc)
474 				return rc;
475 
476 			JFS_SBI(sb)->flag = flag;
477 			ret = jfs_mount_rw(sb, 1);
478 			return ret;
479 		}
480 	JFS_SBI(sb)->flag = flag;
481 
482 	return 0;
483 }
484 
jfs_fill_super(struct super_block * sb,void * data,int silent)485 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
486 {
487 	struct jfs_sb_info *sbi;
488 	struct inode *inode;
489 	int rc;
490 	s64 newLVSize = 0;
491 	int flag, ret = -EINVAL;
492 
493 	jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
494 
495 	sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
496 	if (!sbi)
497 		return -ENOMEM;
498 
499 	sb->s_fs_info = sbi;
500 	sb->s_max_links = JFS_LINK_MAX;
501 	sb->s_time_min = 0;
502 	sb->s_time_max = U32_MAX;
503 	sbi->sb = sb;
504 	sbi->uid = INVALID_UID;
505 	sbi->gid = INVALID_GID;
506 	sbi->umask = -1;
507 
508 	/* initialize the mount flag and determine the default error handler */
509 	flag = JFS_ERR_REMOUNT_RO;
510 
511 	if (!parse_options((char *) data, sb, &newLVSize, &flag))
512 		goto out_kfree;
513 	sbi->flag = flag;
514 
515 #ifdef CONFIG_JFS_POSIX_ACL
516 	sb->s_flags |= SB_POSIXACL;
517 #endif
518 
519 	if (newLVSize) {
520 		pr_err("resize option for remount only\n");
521 		goto out_kfree;
522 	}
523 
524 	/*
525 	 * Initialize blocksize to 4K.
526 	 */
527 	sb_set_blocksize(sb, PSIZE);
528 
529 	/*
530 	 * Set method vectors.
531 	 */
532 	sb->s_op = &jfs_super_operations;
533 	sb->s_export_op = &jfs_export_operations;
534 	sb->s_xattr = jfs_xattr_handlers;
535 #ifdef CONFIG_QUOTA
536 	sb->dq_op = &dquot_operations;
537 	sb->s_qcop = &jfs_quotactl_ops;
538 	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
539 #endif
540 
541 	/*
542 	 * Initialize direct-mapping inode/address-space
543 	 */
544 	inode = new_inode(sb);
545 	if (inode == NULL) {
546 		ret = -ENOMEM;
547 		goto out_unload;
548 	}
549 	inode->i_size = bdev_nr_bytes(sb->s_bdev);
550 	inode->i_mapping->a_ops = &jfs_metapage_aops;
551 	inode_fake_hash(inode);
552 	mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
553 
554 	sbi->direct_inode = inode;
555 
556 	rc = jfs_mount(sb);
557 	if (rc) {
558 		if (!silent)
559 			jfs_err("jfs_mount failed w/return code = %d", rc);
560 		goto out_mount_failed;
561 	}
562 	if (sb_rdonly(sb))
563 		sbi->log = NULL;
564 	else {
565 		rc = jfs_mount_rw(sb, 0);
566 		if (rc) {
567 			if (!silent) {
568 				jfs_err("jfs_mount_rw failed, return code = %d",
569 					rc);
570 			}
571 			goto out_no_rw;
572 		}
573 	}
574 
575 	sb->s_magic = JFS_SUPER_MAGIC;
576 
577 	if (sbi->mntflag & JFS_OS2)
578 		sb->s_d_op = &jfs_ci_dentry_operations;
579 
580 	inode = jfs_iget(sb, ROOT_I);
581 	if (IS_ERR(inode)) {
582 		ret = PTR_ERR(inode);
583 		goto out_no_rw;
584 	}
585 	sb->s_root = d_make_root(inode);
586 	if (!sb->s_root)
587 		goto out_no_root;
588 
589 	/* logical blocks are represented by 40 bits in pxd_t, etc.
590 	 * and page cache is indexed by long
591 	 */
592 	sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE);
593 	sb->s_time_gran = 1;
594 	return 0;
595 
596 out_no_root:
597 	jfs_err("jfs_read_super: get root dentry failed");
598 
599 out_no_rw:
600 	rc = jfs_umount(sb);
601 	if (rc)
602 		jfs_err("jfs_umount failed with return code %d", rc);
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 	unload_nls(sbi->nls_tab);
611 out_kfree:
612 	kfree(sbi);
613 	return ret;
614 }
615 
jfs_freeze(struct super_block * sb)616 static int jfs_freeze(struct super_block *sb)
617 {
618 	struct jfs_sb_info *sbi = JFS_SBI(sb);
619 	struct jfs_log *log = sbi->log;
620 	int rc = 0;
621 
622 	if (!sb_rdonly(sb)) {
623 		txQuiesce(sb);
624 		rc = lmLogShutdown(log);
625 		if (rc) {
626 			jfs_error(sb, "lmLogShutdown failed\n");
627 
628 			/* let operations fail rather than hang */
629 			txResume(sb);
630 
631 			return rc;
632 		}
633 		rc = updateSuper(sb, FM_CLEAN);
634 		if (rc) {
635 			jfs_err("jfs_freeze: updateSuper failed");
636 			/*
637 			 * Don't fail here. Everything succeeded except
638 			 * marking the superblock clean, so there's really
639 			 * no harm in leaving it frozen for now.
640 			 */
641 		}
642 	}
643 	return 0;
644 }
645 
jfs_unfreeze(struct super_block * sb)646 static int jfs_unfreeze(struct super_block *sb)
647 {
648 	struct jfs_sb_info *sbi = JFS_SBI(sb);
649 	struct jfs_log *log = sbi->log;
650 	int rc = 0;
651 
652 	if (!sb_rdonly(sb)) {
653 		rc = updateSuper(sb, FM_MOUNT);
654 		if (rc) {
655 			jfs_error(sb, "updateSuper failed\n");
656 			goto out;
657 		}
658 		rc = lmLogInit(log);
659 		if (rc)
660 			jfs_error(sb, "lmLogInit failed\n");
661 out:
662 		txResume(sb);
663 	}
664 	return rc;
665 }
666 
jfs_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)667 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
668 	int flags, const char *dev_name, void *data)
669 {
670 	return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
671 }
672 
jfs_sync_fs(struct super_block * sb,int wait)673 static int jfs_sync_fs(struct super_block *sb, int wait)
674 {
675 	struct jfs_log *log = JFS_SBI(sb)->log;
676 
677 	/* log == NULL indicates read-only mount */
678 	if (log) {
679 		/*
680 		 * Write quota structures to quota file, sync_blockdev() will
681 		 * write them to disk later
682 		 */
683 		dquot_writeback_dquots(sb, -1);
684 		jfs_flush_journal(log, wait);
685 		jfs_syncpt(log, 0);
686 	}
687 
688 	return 0;
689 }
690 
jfs_show_options(struct seq_file * seq,struct dentry * root)691 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
692 {
693 	struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
694 
695 	if (uid_valid(sbi->uid))
696 		seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
697 	if (gid_valid(sbi->gid))
698 		seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
699 	if (sbi->umask != -1)
700 		seq_printf(seq, ",umask=%03o", sbi->umask);
701 	if (sbi->flag & JFS_NOINTEGRITY)
702 		seq_puts(seq, ",nointegrity");
703 	if (sbi->flag & JFS_DISCARD)
704 		seq_printf(seq, ",discard=%u", sbi->minblks_trim);
705 	if (sbi->nls_tab)
706 		seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
707 	if (sbi->flag & JFS_ERR_CONTINUE)
708 		seq_printf(seq, ",errors=continue");
709 	if (sbi->flag & JFS_ERR_PANIC)
710 		seq_printf(seq, ",errors=panic");
711 
712 #ifdef CONFIG_QUOTA
713 	if (sbi->flag & JFS_USRQUOTA)
714 		seq_puts(seq, ",usrquota");
715 
716 	if (sbi->flag & JFS_GRPQUOTA)
717 		seq_puts(seq, ",grpquota");
718 #endif
719 
720 	return 0;
721 }
722 
723 #ifdef CONFIG_QUOTA
724 
725 /* Read data from quotafile - avoid pagecache and such because we cannot afford
726  * acquiring the locks... As quota files are never truncated and quota code
727  * itself serializes the operations (and no one else should touch the files)
728  * we don't have to be afraid of races */
jfs_quota_read(struct super_block * sb,int type,char * data,size_t len,loff_t off)729 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
730 			      size_t len, loff_t off)
731 {
732 	struct inode *inode = sb_dqopt(sb)->files[type];
733 	sector_t blk = off >> sb->s_blocksize_bits;
734 	int err = 0;
735 	int offset = off & (sb->s_blocksize - 1);
736 	int tocopy;
737 	size_t toread;
738 	struct buffer_head tmp_bh;
739 	struct buffer_head *bh;
740 	loff_t i_size = i_size_read(inode);
741 
742 	if (off > i_size)
743 		return 0;
744 	if (off+len > i_size)
745 		len = i_size-off;
746 	toread = len;
747 	while (toread > 0) {
748 		tocopy = sb->s_blocksize - offset < toread ?
749 				sb->s_blocksize - offset : toread;
750 
751 		tmp_bh.b_state = 0;
752 		tmp_bh.b_size = i_blocksize(inode);
753 		err = jfs_get_block(inode, blk, &tmp_bh, 0);
754 		if (err)
755 			return err;
756 		if (!buffer_mapped(&tmp_bh))	/* A hole? */
757 			memset(data, 0, tocopy);
758 		else {
759 			bh = sb_bread(sb, tmp_bh.b_blocknr);
760 			if (!bh)
761 				return -EIO;
762 			memcpy(data, bh->b_data+offset, tocopy);
763 			brelse(bh);
764 		}
765 		offset = 0;
766 		toread -= tocopy;
767 		data += tocopy;
768 		blk++;
769 	}
770 	return len;
771 }
772 
773 /* Write to quotafile */
jfs_quota_write(struct super_block * sb,int type,const char * data,size_t len,loff_t off)774 static ssize_t jfs_quota_write(struct super_block *sb, int type,
775 			       const char *data, size_t len, loff_t off)
776 {
777 	struct inode *inode = sb_dqopt(sb)->files[type];
778 	sector_t blk = off >> sb->s_blocksize_bits;
779 	int err = 0;
780 	int offset = off & (sb->s_blocksize - 1);
781 	int tocopy;
782 	size_t towrite = len;
783 	struct buffer_head tmp_bh;
784 	struct buffer_head *bh;
785 
786 	inode_lock(inode);
787 	while (towrite > 0) {
788 		tocopy = sb->s_blocksize - offset < towrite ?
789 				sb->s_blocksize - offset : towrite;
790 
791 		tmp_bh.b_state = 0;
792 		tmp_bh.b_size = i_blocksize(inode);
793 		err = jfs_get_block(inode, blk, &tmp_bh, 1);
794 		if (err)
795 			goto out;
796 		if (offset || tocopy != sb->s_blocksize)
797 			bh = sb_bread(sb, tmp_bh.b_blocknr);
798 		else
799 			bh = sb_getblk(sb, tmp_bh.b_blocknr);
800 		if (!bh) {
801 			err = -EIO;
802 			goto out;
803 		}
804 		lock_buffer(bh);
805 		memcpy(bh->b_data+offset, data, tocopy);
806 		flush_dcache_page(bh->b_page);
807 		set_buffer_uptodate(bh);
808 		mark_buffer_dirty(bh);
809 		unlock_buffer(bh);
810 		brelse(bh);
811 		offset = 0;
812 		towrite -= tocopy;
813 		data += tocopy;
814 		blk++;
815 	}
816 out:
817 	if (len == towrite) {
818 		inode_unlock(inode);
819 		return err;
820 	}
821 	if (inode->i_size < off+len-towrite)
822 		i_size_write(inode, off+len-towrite);
823 	inode->i_mtime = inode->i_ctime = current_time(inode);
824 	mark_inode_dirty(inode);
825 	inode_unlock(inode);
826 	return len - towrite;
827 }
828 
jfs_get_dquots(struct inode * inode)829 static struct dquot **jfs_get_dquots(struct inode *inode)
830 {
831 	return JFS_IP(inode)->i_dquot;
832 }
833 
jfs_quota_on(struct super_block * sb,int type,int format_id,const struct path * path)834 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
835 			const struct path *path)
836 {
837 	int err;
838 	struct inode *inode;
839 
840 	err = dquot_quota_on(sb, type, format_id, path);
841 	if (err)
842 		return err;
843 
844 	inode = d_inode(path->dentry);
845 	inode_lock(inode);
846 	JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
847 	inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
848 			S_NOATIME | S_IMMUTABLE);
849 	inode_unlock(inode);
850 	mark_inode_dirty(inode);
851 
852 	return 0;
853 }
854 
jfs_quota_off(struct super_block * sb,int type)855 static int jfs_quota_off(struct super_block *sb, int type)
856 {
857 	struct inode *inode = sb_dqopt(sb)->files[type];
858 	int err;
859 
860 	if (!inode || !igrab(inode))
861 		goto out;
862 
863 	err = dquot_quota_off(sb, type);
864 	if (err)
865 		goto out_put;
866 
867 	inode_lock(inode);
868 	JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
869 	inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
870 	inode_unlock(inode);
871 	mark_inode_dirty(inode);
872 out_put:
873 	iput(inode);
874 	return err;
875 out:
876 	return dquot_quota_off(sb, type);
877 }
878 #endif
879 
880 static const struct super_operations jfs_super_operations = {
881 	.alloc_inode	= jfs_alloc_inode,
882 	.free_inode	= jfs_free_inode,
883 	.dirty_inode	= jfs_dirty_inode,
884 	.write_inode	= jfs_write_inode,
885 	.evict_inode	= jfs_evict_inode,
886 	.put_super	= jfs_put_super,
887 	.sync_fs	= jfs_sync_fs,
888 	.freeze_fs	= jfs_freeze,
889 	.unfreeze_fs	= jfs_unfreeze,
890 	.statfs		= jfs_statfs,
891 	.remount_fs	= jfs_remount,
892 	.show_options	= jfs_show_options,
893 #ifdef CONFIG_QUOTA
894 	.quota_read	= jfs_quota_read,
895 	.quota_write	= jfs_quota_write,
896 	.get_dquots	= jfs_get_dquots,
897 #endif
898 };
899 
900 static const struct export_operations jfs_export_operations = {
901 	.fh_to_dentry	= jfs_fh_to_dentry,
902 	.fh_to_parent	= jfs_fh_to_parent,
903 	.get_parent	= jfs_get_parent,
904 };
905 
906 static struct file_system_type jfs_fs_type = {
907 	.owner		= THIS_MODULE,
908 	.name		= "jfs",
909 	.mount		= jfs_do_mount,
910 	.kill_sb	= kill_block_super,
911 	.fs_flags	= FS_REQUIRES_DEV,
912 };
913 MODULE_ALIAS_FS("jfs");
914 
init_once(void * foo)915 static void init_once(void *foo)
916 {
917 	struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
918 
919 	memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
920 	INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
921 	init_rwsem(&jfs_ip->rdwrlock);
922 	mutex_init(&jfs_ip->commit_mutex);
923 	init_rwsem(&jfs_ip->xattr_sem);
924 	spin_lock_init(&jfs_ip->ag_lock);
925 	jfs_ip->active_ag = -1;
926 	inode_init_once(&jfs_ip->vfs_inode);
927 }
928 
init_jfs_fs(void)929 static int __init init_jfs_fs(void)
930 {
931 	int i;
932 	int rc;
933 
934 	jfs_inode_cachep =
935 	    kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
936 			0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
937 			offsetof(struct jfs_inode_info, i_inline_all),
938 			sizeof_field(struct jfs_inode_info, i_inline_all),
939 			init_once);
940 	if (jfs_inode_cachep == NULL)
941 		return -ENOMEM;
942 
943 	/*
944 	 * Metapage initialization
945 	 */
946 	rc = metapage_init();
947 	if (rc) {
948 		jfs_err("metapage_init failed w/rc = %d", rc);
949 		goto free_slab;
950 	}
951 
952 	/*
953 	 * Transaction Manager initialization
954 	 */
955 	rc = txInit();
956 	if (rc) {
957 		jfs_err("txInit failed w/rc = %d", rc);
958 		goto free_metapage;
959 	}
960 
961 	/*
962 	 * I/O completion thread (endio)
963 	 */
964 	jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
965 	if (IS_ERR(jfsIOthread)) {
966 		rc = PTR_ERR(jfsIOthread);
967 		jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
968 		goto end_txmngr;
969 	}
970 
971 	if (commit_threads < 1)
972 		commit_threads = num_online_cpus();
973 	if (commit_threads > MAX_COMMIT_THREADS)
974 		commit_threads = MAX_COMMIT_THREADS;
975 
976 	for (i = 0; i < commit_threads; i++) {
977 		jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
978 						 "jfsCommit");
979 		if (IS_ERR(jfsCommitThread[i])) {
980 			rc = PTR_ERR(jfsCommitThread[i]);
981 			jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
982 			commit_threads = i;
983 			goto kill_committask;
984 		}
985 	}
986 
987 	jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
988 	if (IS_ERR(jfsSyncThread)) {
989 		rc = PTR_ERR(jfsSyncThread);
990 		jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
991 		goto kill_committask;
992 	}
993 
994 #ifdef PROC_FS_JFS
995 	jfs_proc_init();
996 #endif
997 
998 	rc = register_filesystem(&jfs_fs_type);
999 	if (!rc)
1000 		return 0;
1001 
1002 #ifdef PROC_FS_JFS
1003 	jfs_proc_clean();
1004 #endif
1005 	kthread_stop(jfsSyncThread);
1006 kill_committask:
1007 	for (i = 0; i < commit_threads; i++)
1008 		kthread_stop(jfsCommitThread[i]);
1009 	kthread_stop(jfsIOthread);
1010 end_txmngr:
1011 	txExit();
1012 free_metapage:
1013 	metapage_exit();
1014 free_slab:
1015 	kmem_cache_destroy(jfs_inode_cachep);
1016 	return rc;
1017 }
1018 
exit_jfs_fs(void)1019 static void __exit exit_jfs_fs(void)
1020 {
1021 	int i;
1022 
1023 	jfs_info("exit_jfs_fs called");
1024 
1025 	txExit();
1026 	metapage_exit();
1027 
1028 	kthread_stop(jfsIOthread);
1029 	for (i = 0; i < commit_threads; i++)
1030 		kthread_stop(jfsCommitThread[i]);
1031 	kthread_stop(jfsSyncThread);
1032 #ifdef PROC_FS_JFS
1033 	jfs_proc_clean();
1034 #endif
1035 	unregister_filesystem(&jfs_fs_type);
1036 
1037 	/*
1038 	 * Make sure all delayed rcu free inodes are flushed before we
1039 	 * destroy cache.
1040 	 */
1041 	rcu_barrier();
1042 	kmem_cache_destroy(jfs_inode_cachep);
1043 }
1044 
1045 module_init(init_jfs_fs)
1046 module_exit(exit_jfs_fs)
1047