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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 <linux/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#include "jfs_dinode.h"
49
50MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
51MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
52MODULE_LICENSE("GPL");
53
54static struct kmem_cache *jfs_inode_cachep;
55
56static const struct super_operations jfs_super_operations;
57static const struct export_operations jfs_export_operations;
58static struct file_system_type jfs_fs_type;
59
60#define MAX_COMMIT_THREADS 64
61static int commit_threads;
62module_param(commit_threads, int, 0);
63MODULE_PARM_DESC(commit_threads, "Number of commit threads");
64
65static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
66struct task_struct *jfsIOthread;
67struct task_struct *jfsSyncThread;
68
69#ifdef CONFIG_JFS_DEBUG
70int jfsloglevel = JFS_LOGLEVEL_WARN;
71module_param(jfsloglevel, int, 0644);
72MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
73#endif
74
75static void jfs_handle_error(struct super_block *sb)
76{
77 struct jfs_sb_info *sbi = JFS_SBI(sb);
78
79 if (sb_rdonly(sb))
80 return;
81
82 updateSuper(sb, FM_DIRTY);
83
84 if (sbi->flag & JFS_ERR_PANIC)
85 panic("JFS (device %s): panic forced after error\n",
86 sb->s_id);
87 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
88 jfs_err("ERROR: (device %s): remounting filesystem as read-only",
89 sb->s_id);
90 sb->s_flags |= SB_RDONLY;
91 }
92
93 /* nothing is done for continue beyond marking the superblock dirty */
94}
95
96void 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): %ps: %pV\n",
107 sb->s_id, __builtin_return_address(0), &vaf);
108
109 va_end(args);
110
111 jfs_handle_error(sb);
112}
113
114static 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#ifdef CONFIG_QUOTA
122 memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot));
123#endif
124 return &jfs_inode->vfs_inode;
125}
126
127static void jfs_i_callback(struct rcu_head *head)
128{
129 struct inode *inode = container_of(head, struct inode, i_rcu);
130 struct jfs_inode_info *ji = JFS_IP(inode);
131 kmem_cache_free(jfs_inode_cachep, ji);
132}
133
134static void jfs_destroy_inode(struct inode *inode)
135{
136 struct jfs_inode_info *ji = JFS_IP(inode);
137
138 BUG_ON(!list_empty(&ji->anon_inode_list));
139
140 spin_lock_irq(&ji->ag_lock);
141 if (ji->active_ag != -1) {
142 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
143 atomic_dec(&bmap->db_active[ji->active_ag]);
144 ji->active_ag = -1;
145 }
146 spin_unlock_irq(&ji->ag_lock);
147 call_rcu(&inode->i_rcu, jfs_i_callback);
148}
149
150static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
151{
152 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
153 s64 maxinodes;
154 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
155
156 jfs_info("In jfs_statfs");
157 buf->f_type = JFS_SUPER_MAGIC;
158 buf->f_bsize = sbi->bsize;
159 buf->f_blocks = sbi->bmap->db_mapsize;
160 buf->f_bfree = sbi->bmap->db_nfree;
161 buf->f_bavail = sbi->bmap->db_nfree;
162 /*
163 * If we really return the number of allocated & free inodes, some
164 * applications will fail because they won't see enough free inodes.
165 * We'll try to calculate some guess as to how many inodes we can
166 * really allocate
167 *
168 * buf->f_files = atomic_read(&imap->im_numinos);
169 * buf->f_ffree = atomic_read(&imap->im_numfree);
170 */
171 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
172 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
173 << L2INOSPEREXT), (s64) 0xffffffffLL);
174 buf->f_files = maxinodes;
175 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
176 atomic_read(&imap->im_numfree));
177 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
178 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
179 sizeof(sbi->uuid)/2);
180
181 buf->f_namelen = JFS_NAME_MAX;
182 return 0;
183}
184
185#ifdef CONFIG_QUOTA
186static int jfs_quota_off(struct super_block *sb, int type);
187static int jfs_quota_on(struct super_block *sb, int type, int format_id,
188 const struct path *path);
189
190static void jfs_quota_off_umount(struct super_block *sb)
191{
192 int type;
193
194 for (type = 0; type < MAXQUOTAS; type++)
195 jfs_quota_off(sb, type);
196}
197
198static const struct quotactl_ops jfs_quotactl_ops = {
199 .quota_on = jfs_quota_on,
200 .quota_off = jfs_quota_off,
201 .quota_sync = dquot_quota_sync,
202 .get_state = dquot_get_state,
203 .set_info = dquot_set_dqinfo,
204 .get_dqblk = dquot_get_dqblk,
205 .set_dqblk = dquot_set_dqblk,
206 .get_nextdqblk = dquot_get_next_dqblk,
207};
208#else
209static inline void jfs_quota_off_umount(struct super_block *sb)
210{
211}
212#endif
213
214static void jfs_put_super(struct super_block *sb)
215{
216 struct jfs_sb_info *sbi = JFS_SBI(sb);
217 int rc;
218
219 jfs_info("In jfs_put_super");
220
221 jfs_quota_off_umount(sb);
222
223 rc = jfs_umount(sb);
224 if (rc)
225 jfs_err("jfs_umount failed with return code %d", rc);
226
227 unload_nls(sbi->nls_tab);
228
229 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
230 iput(sbi->direct_inode);
231
232 kfree(sbi);
233}
234
235enum {
236 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
237 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
238 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
239 Opt_discard, Opt_nodiscard, Opt_discard_minblk
240};
241
242static const match_table_t tokens = {
243 {Opt_integrity, "integrity"},
244 {Opt_nointegrity, "nointegrity"},
245 {Opt_iocharset, "iocharset=%s"},
246 {Opt_resize, "resize=%u"},
247 {Opt_resize_nosize, "resize"},
248 {Opt_errors, "errors=%s"},
249 {Opt_ignore, "noquota"},
250 {Opt_ignore, "quota"},
251 {Opt_usrquota, "usrquota"},
252 {Opt_grpquota, "grpquota"},
253 {Opt_uid, "uid=%u"},
254 {Opt_gid, "gid=%u"},
255 {Opt_umask, "umask=%u"},
256 {Opt_discard, "discard"},
257 {Opt_nodiscard, "nodiscard"},
258 {Opt_discard_minblk, "discard=%u"},
259 {Opt_err, NULL}
260};
261
262static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
263 int *flag)
264{
265 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
266 char *p;
267 struct jfs_sb_info *sbi = JFS_SBI(sb);
268
269 *newLVSize = 0;
270
271 if (!options)
272 return 1;
273
274 while ((p = strsep(&options, ",")) != NULL) {
275 substring_t args[MAX_OPT_ARGS];
276 int token;
277 if (!*p)
278 continue;
279
280 token = match_token(p, tokens, args);
281 switch (token) {
282 case Opt_integrity:
283 *flag &= ~JFS_NOINTEGRITY;
284 break;
285 case Opt_nointegrity:
286 *flag |= JFS_NOINTEGRITY;
287 break;
288 case Opt_ignore:
289 /* Silently ignore the quota options */
290 /* Don't do anything ;-) */
291 break;
292 case Opt_iocharset:
293 if (nls_map && nls_map != (void *) -1)
294 unload_nls(nls_map);
295 if (!strcmp(args[0].from, "none"))
296 nls_map = NULL;
297 else {
298 nls_map = load_nls(args[0].from);
299 if (!nls_map) {
300 pr_err("JFS: charset not found\n");
301 goto cleanup;
302 }
303 }
304 break;
305 case Opt_resize:
306 {
307 char *resize = args[0].from;
308 int rc = kstrtoll(resize, 0, newLVSize);
309
310 if (rc)
311 goto cleanup;
312 break;
313 }
314 case Opt_resize_nosize:
315 {
316 *newLVSize = i_size_read(sb->s_bdev->bd_inode) >>
317 sb->s_blocksize_bits;
318 if (*newLVSize == 0)
319 pr_err("JFS: Cannot determine volume size\n");
320 break;
321 }
322 case Opt_errors:
323 {
324 char *errors = args[0].from;
325 if (!errors || !*errors)
326 goto cleanup;
327 if (!strcmp(errors, "continue")) {
328 *flag &= ~JFS_ERR_REMOUNT_RO;
329 *flag &= ~JFS_ERR_PANIC;
330 *flag |= JFS_ERR_CONTINUE;
331 } else if (!strcmp(errors, "remount-ro")) {
332 *flag &= ~JFS_ERR_CONTINUE;
333 *flag &= ~JFS_ERR_PANIC;
334 *flag |= JFS_ERR_REMOUNT_RO;
335 } else if (!strcmp(errors, "panic")) {
336 *flag &= ~JFS_ERR_CONTINUE;
337 *flag &= ~JFS_ERR_REMOUNT_RO;
338 *flag |= JFS_ERR_PANIC;
339 } else {
340 pr_err("JFS: %s is an invalid error handler\n",
341 errors);
342 goto cleanup;
343 }
344 break;
345 }
346
347#ifdef CONFIG_QUOTA
348 case Opt_quota:
349 case Opt_usrquota:
350 *flag |= JFS_USRQUOTA;
351 break;
352 case Opt_grpquota:
353 *flag |= JFS_GRPQUOTA;
354 break;
355#else
356 case Opt_usrquota:
357 case Opt_grpquota:
358 case Opt_quota:
359 pr_err("JFS: quota operations not supported\n");
360 break;
361#endif
362 case Opt_uid:
363 {
364 char *uid = args[0].from;
365 uid_t val;
366 int rc = kstrtouint(uid, 0, &val);
367
368 if (rc)
369 goto cleanup;
370 sbi->uid = make_kuid(current_user_ns(), val);
371 if (!uid_valid(sbi->uid))
372 goto cleanup;
373 break;
374 }
375
376 case Opt_gid:
377 {
378 char *gid = args[0].from;
379 gid_t val;
380 int rc = kstrtouint(gid, 0, &val);
381
382 if (rc)
383 goto cleanup;
384 sbi->gid = make_kgid(current_user_ns(), val);
385 if (!gid_valid(sbi->gid))
386 goto cleanup;
387 break;
388 }
389
390 case Opt_umask:
391 {
392 char *umask = args[0].from;
393 int rc = kstrtouint(umask, 8, &sbi->umask);
394
395 if (rc)
396 goto cleanup;
397 if (sbi->umask & ~0777) {
398 pr_err("JFS: Invalid value of umask\n");
399 goto cleanup;
400 }
401 break;
402 }
403
404 case Opt_discard:
405 {
406 struct request_queue *q = bdev_get_queue(sb->s_bdev);
407 /* if set to 1, even copying files will cause
408 * trimming :O
409 * -> user has more control over the online trimming
410 */
411 sbi->minblks_trim = 64;
412 if (blk_queue_discard(q))
413 *flag |= JFS_DISCARD;
414 else
415 pr_err("JFS: discard option not supported on device\n");
416 break;
417 }
418
419 case Opt_nodiscard:
420 *flag &= ~JFS_DISCARD;
421 break;
422
423 case Opt_discard_minblk:
424 {
425 struct request_queue *q = bdev_get_queue(sb->s_bdev);
426 char *minblks_trim = args[0].from;
427 int rc;
428 if (blk_queue_discard(q)) {
429 *flag |= JFS_DISCARD;
430 rc = kstrtouint(minblks_trim, 0,
431 &sbi->minblks_trim);
432 if (rc)
433 goto cleanup;
434 } else
435 pr_err("JFS: discard option not supported on device\n");
436 break;
437 }
438
439 default:
440 printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
441 p);
442 goto cleanup;
443 }
444 }
445
446 if (nls_map != (void *) -1) {
447 /* Discard old (if remount) */
448 unload_nls(sbi->nls_tab);
449 sbi->nls_tab = nls_map;
450 }
451 return 1;
452
453cleanup:
454 if (nls_map && nls_map != (void *) -1)
455 unload_nls(nls_map);
456 return 0;
457}
458
459static int jfs_remount(struct super_block *sb, int *flags, char *data)
460{
461 s64 newLVSize = 0;
462 int rc = 0;
463 int flag = JFS_SBI(sb)->flag;
464 int ret;
465
466 sync_filesystem(sb);
467 if (!parse_options(data, sb, &newLVSize, &flag))
468 return -EINVAL;
469
470 if (newLVSize) {
471 if (sb_rdonly(sb)) {
472 pr_err("JFS: resize requires volume to be mounted read-write\n");
473 return -EROFS;
474 }
475 rc = jfs_extendfs(sb, newLVSize, 0);
476 if (rc)
477 return rc;
478 }
479
480 if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) {
481 /*
482 * Invalidate any previously read metadata. fsck may have
483 * changed the on-disk data since we mounted r/o
484 */
485 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
486
487 JFS_SBI(sb)->flag = flag;
488 ret = jfs_mount_rw(sb, 1);
489
490 /* mark the fs r/w for quota activity */
491 sb->s_flags &= ~SB_RDONLY;
492
493 dquot_resume(sb, -1);
494 return ret;
495 }
496 if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) {
497 rc = dquot_suspend(sb, -1);
498 if (rc < 0)
499 return rc;
500 rc = jfs_umount_rw(sb);
501 JFS_SBI(sb)->flag = flag;
502 return rc;
503 }
504 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
505 if (!sb_rdonly(sb)) {
506 rc = jfs_umount_rw(sb);
507 if (rc)
508 return rc;
509
510 JFS_SBI(sb)->flag = flag;
511 ret = jfs_mount_rw(sb, 1);
512 return ret;
513 }
514 JFS_SBI(sb)->flag = flag;
515
516 return 0;
517}
518
519static int jfs_fill_super(struct super_block *sb, void *data, int silent)
520{
521 struct jfs_sb_info *sbi;
522 struct inode *inode;
523 int rc;
524 s64 newLVSize = 0;
525 int flag, ret = -EINVAL;
526
527 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
528
529 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
530 if (!sbi)
531 return -ENOMEM;
532
533 sb->s_fs_info = sbi;
534 sb->s_max_links = JFS_LINK_MAX;
535 sbi->sb = sb;
536 sbi->uid = INVALID_UID;
537 sbi->gid = INVALID_GID;
538 sbi->umask = -1;
539
540 /* initialize the mount flag and determine the default error handler */
541 flag = JFS_ERR_REMOUNT_RO;
542
543 if (!parse_options((char *) data, sb, &newLVSize, &flag))
544 goto out_kfree;
545 sbi->flag = flag;
546
547#ifdef CONFIG_JFS_POSIX_ACL
548 sb->s_flags |= SB_POSIXACL;
549#endif
550
551 if (newLVSize) {
552 pr_err("resize option for remount only\n");
553 goto out_kfree;
554 }
555
556 /*
557 * Initialize blocksize to 4K.
558 */
559 sb_set_blocksize(sb, PSIZE);
560
561 /*
562 * Set method vectors.
563 */
564 sb->s_op = &jfs_super_operations;
565 sb->s_export_op = &jfs_export_operations;
566 sb->s_xattr = jfs_xattr_handlers;
567#ifdef CONFIG_QUOTA
568 sb->dq_op = &dquot_operations;
569 sb->s_qcop = &jfs_quotactl_ops;
570 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
571#endif
572
573 /*
574 * Initialize direct-mapping inode/address-space
575 */
576 inode = new_inode(sb);
577 if (inode == NULL) {
578 ret = -ENOMEM;
579 goto out_unload;
580 }
581 inode->i_ino = 0;
582 inode->i_size = i_size_read(sb->s_bdev->bd_inode);
583 inode->i_mapping->a_ops = &jfs_metapage_aops;
584 hlist_add_fake(&inode->i_hash);
585 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
586
587 sbi->direct_inode = inode;
588
589 rc = jfs_mount(sb);
590 if (rc) {
591 if (!silent)
592 jfs_err("jfs_mount failed w/return code = %d", rc);
593 goto out_mount_failed;
594 }
595 if (sb_rdonly(sb))
596 sbi->log = NULL;
597 else {
598 rc = jfs_mount_rw(sb, 0);
599 if (rc) {
600 if (!silent) {
601 jfs_err("jfs_mount_rw failed, return code = %d",
602 rc);
603 }
604 goto out_no_rw;
605 }
606 }
607
608 sb->s_magic = JFS_SUPER_MAGIC;
609
610 if (sbi->mntflag & JFS_OS2)
611 sb->s_d_op = &jfs_ci_dentry_operations;
612
613 inode = jfs_iget(sb, ROOT_I);
614 if (IS_ERR(inode)) {
615 ret = PTR_ERR(inode);
616 goto out_no_rw;
617 }
618 sb->s_root = d_make_root(inode);
619 if (!sb->s_root)
620 goto out_no_root;
621
622 /* logical blocks are represented by 40 bits in pxd_t, etc.
623 * and page cache is indexed by long
624 */
625 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE);
626 sb->s_time_gran = 1;
627 return 0;
628
629out_no_root:
630 jfs_err("jfs_read_super: get root dentry failed");
631
632out_no_rw:
633 rc = jfs_umount(sb);
634 if (rc)
635 jfs_err("jfs_umount failed with return code %d", rc);
636out_mount_failed:
637 filemap_write_and_wait(sbi->direct_inode->i_mapping);
638 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
639 make_bad_inode(sbi->direct_inode);
640 iput(sbi->direct_inode);
641 sbi->direct_inode = NULL;
642out_unload:
643 unload_nls(sbi->nls_tab);
644out_kfree:
645 kfree(sbi);
646 return ret;
647}
648
649static int jfs_freeze(struct super_block *sb)
650{
651 struct jfs_sb_info *sbi = JFS_SBI(sb);
652 struct jfs_log *log = sbi->log;
653 int rc = 0;
654
655 if (!sb_rdonly(sb)) {
656 txQuiesce(sb);
657 rc = lmLogShutdown(log);
658 if (rc) {
659 jfs_error(sb, "lmLogShutdown failed\n");
660
661 /* let operations fail rather than hang */
662 txResume(sb);
663
664 return rc;
665 }
666 rc = updateSuper(sb, FM_CLEAN);
667 if (rc) {
668 jfs_err("jfs_freeze: updateSuper failed");
669 /*
670 * Don't fail here. Everything succeeded except
671 * marking the superblock clean, so there's really
672 * no harm in leaving it frozen for now.
673 */
674 }
675 }
676 return 0;
677}
678
679static int jfs_unfreeze(struct super_block *sb)
680{
681 struct jfs_sb_info *sbi = JFS_SBI(sb);
682 struct jfs_log *log = sbi->log;
683 int rc = 0;
684
685 if (!sb_rdonly(sb)) {
686 rc = updateSuper(sb, FM_MOUNT);
687 if (rc) {
688 jfs_error(sb, "updateSuper failed\n");
689 goto out;
690 }
691 rc = lmLogInit(log);
692 if (rc)
693 jfs_error(sb, "lmLogInit failed\n");
694out:
695 txResume(sb);
696 }
697 return rc;
698}
699
700static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
701 int flags, const char *dev_name, void *data)
702{
703 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
704}
705
706static int jfs_sync_fs(struct super_block *sb, int wait)
707{
708 struct jfs_log *log = JFS_SBI(sb)->log;
709
710 /* log == NULL indicates read-only mount */
711 if (log) {
712 /*
713 * Write quota structures to quota file, sync_blockdev() will
714 * write them to disk later
715 */
716 dquot_writeback_dquots(sb, -1);
717 jfs_flush_journal(log, wait);
718 jfs_syncpt(log, 0);
719 }
720
721 return 0;
722}
723
724static int jfs_show_options(struct seq_file *seq, struct dentry *root)
725{
726 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
727
728 if (uid_valid(sbi->uid))
729 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
730 if (gid_valid(sbi->gid))
731 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
732 if (sbi->umask != -1)
733 seq_printf(seq, ",umask=%03o", sbi->umask);
734 if (sbi->flag & JFS_NOINTEGRITY)
735 seq_puts(seq, ",nointegrity");
736 if (sbi->flag & JFS_DISCARD)
737 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
738 if (sbi->nls_tab)
739 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
740 if (sbi->flag & JFS_ERR_CONTINUE)
741 seq_printf(seq, ",errors=continue");
742 if (sbi->flag & JFS_ERR_PANIC)
743 seq_printf(seq, ",errors=panic");
744
745#ifdef CONFIG_QUOTA
746 if (sbi->flag & JFS_USRQUOTA)
747 seq_puts(seq, ",usrquota");
748
749 if (sbi->flag & JFS_GRPQUOTA)
750 seq_puts(seq, ",grpquota");
751#endif
752
753 return 0;
754}
755
756#ifdef CONFIG_QUOTA
757
758/* Read data from quotafile - avoid pagecache and such because we cannot afford
759 * acquiring the locks... As quota files are never truncated and quota code
760 * itself serializes the operations (and no one else should touch the files)
761 * we don't have to be afraid of races */
762static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
763 size_t len, loff_t off)
764{
765 struct inode *inode = sb_dqopt(sb)->files[type];
766 sector_t blk = off >> sb->s_blocksize_bits;
767 int err = 0;
768 int offset = off & (sb->s_blocksize - 1);
769 int tocopy;
770 size_t toread;
771 struct buffer_head tmp_bh;
772 struct buffer_head *bh;
773 loff_t i_size = i_size_read(inode);
774
775 if (off > i_size)
776 return 0;
777 if (off+len > i_size)
778 len = i_size-off;
779 toread = len;
780 while (toread > 0) {
781 tocopy = sb->s_blocksize - offset < toread ?
782 sb->s_blocksize - offset : toread;
783
784 tmp_bh.b_state = 0;
785 tmp_bh.b_size = i_blocksize(inode);
786 err = jfs_get_block(inode, blk, &tmp_bh, 0);
787 if (err)
788 return err;
789 if (!buffer_mapped(&tmp_bh)) /* A hole? */
790 memset(data, 0, tocopy);
791 else {
792 bh = sb_bread(sb, tmp_bh.b_blocknr);
793 if (!bh)
794 return -EIO;
795 memcpy(data, bh->b_data+offset, tocopy);
796 brelse(bh);
797 }
798 offset = 0;
799 toread -= tocopy;
800 data += tocopy;
801 blk++;
802 }
803 return len;
804}
805
806/* Write to quotafile */
807static ssize_t jfs_quota_write(struct super_block *sb, int type,
808 const char *data, size_t len, loff_t off)
809{
810 struct inode *inode = sb_dqopt(sb)->files[type];
811 sector_t blk = off >> sb->s_blocksize_bits;
812 int err = 0;
813 int offset = off & (sb->s_blocksize - 1);
814 int tocopy;
815 size_t towrite = len;
816 struct buffer_head tmp_bh;
817 struct buffer_head *bh;
818
819 inode_lock(inode);
820 while (towrite > 0) {
821 tocopy = sb->s_blocksize - offset < towrite ?
822 sb->s_blocksize - offset : towrite;
823
824 tmp_bh.b_state = 0;
825 tmp_bh.b_size = i_blocksize(inode);
826 err = jfs_get_block(inode, blk, &tmp_bh, 1);
827 if (err)
828 goto out;
829 if (offset || tocopy != sb->s_blocksize)
830 bh = sb_bread(sb, tmp_bh.b_blocknr);
831 else
832 bh = sb_getblk(sb, tmp_bh.b_blocknr);
833 if (!bh) {
834 err = -EIO;
835 goto out;
836 }
837 lock_buffer(bh);
838 memcpy(bh->b_data+offset, data, tocopy);
839 flush_dcache_page(bh->b_page);
840 set_buffer_uptodate(bh);
841 mark_buffer_dirty(bh);
842 unlock_buffer(bh);
843 brelse(bh);
844 offset = 0;
845 towrite -= tocopy;
846 data += tocopy;
847 blk++;
848 }
849out:
850 if (len == towrite) {
851 inode_unlock(inode);
852 return err;
853 }
854 if (inode->i_size < off+len-towrite)
855 i_size_write(inode, off+len-towrite);
856 inode->i_mtime = inode->i_ctime = current_time(inode);
857 mark_inode_dirty(inode);
858 inode_unlock(inode);
859 return len - towrite;
860}
861
862static struct dquot **jfs_get_dquots(struct inode *inode)
863{
864 return JFS_IP(inode)->i_dquot;
865}
866
867static int jfs_quota_on(struct super_block *sb, int type, int format_id,
868 const struct path *path)
869{
870 int err;
871 struct inode *inode;
872
873 err = dquot_quota_on(sb, type, format_id, path);
874 if (err)
875 return err;
876
877 inode = d_inode(path->dentry);
878 inode_lock(inode);
879 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
880 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
881 S_NOATIME | S_IMMUTABLE);
882 inode_unlock(inode);
883 mark_inode_dirty(inode);
884
885 return 0;
886}
887
888static int jfs_quota_off(struct super_block *sb, int type)
889{
890 struct inode *inode = sb_dqopt(sb)->files[type];
891 int err;
892
893 if (!inode || !igrab(inode))
894 goto out;
895
896 err = dquot_quota_off(sb, type);
897 if (err)
898 goto out_put;
899
900 inode_lock(inode);
901 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
902 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
903 inode_unlock(inode);
904 mark_inode_dirty(inode);
905out_put:
906 iput(inode);
907 return err;
908out:
909 return dquot_quota_off(sb, type);
910}
911#endif
912
913static const struct super_operations jfs_super_operations = {
914 .alloc_inode = jfs_alloc_inode,
915 .destroy_inode = jfs_destroy_inode,
916 .dirty_inode = jfs_dirty_inode,
917 .write_inode = jfs_write_inode,
918 .evict_inode = jfs_evict_inode,
919 .put_super = jfs_put_super,
920 .sync_fs = jfs_sync_fs,
921 .freeze_fs = jfs_freeze,
922 .unfreeze_fs = jfs_unfreeze,
923 .statfs = jfs_statfs,
924 .remount_fs = jfs_remount,
925 .show_options = jfs_show_options,
926#ifdef CONFIG_QUOTA
927 .quota_read = jfs_quota_read,
928 .quota_write = jfs_quota_write,
929 .get_dquots = jfs_get_dquots,
930#endif
931};
932
933static const struct export_operations jfs_export_operations = {
934 .fh_to_dentry = jfs_fh_to_dentry,
935 .fh_to_parent = jfs_fh_to_parent,
936 .get_parent = jfs_get_parent,
937};
938
939static struct file_system_type jfs_fs_type = {
940 .owner = THIS_MODULE,
941 .name = "jfs",
942 .mount = jfs_do_mount,
943 .kill_sb = kill_block_super,
944 .fs_flags = FS_REQUIRES_DEV,
945};
946MODULE_ALIAS_FS("jfs");
947
948static void init_once(void *foo)
949{
950 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
951
952 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
953 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
954 init_rwsem(&jfs_ip->rdwrlock);
955 mutex_init(&jfs_ip->commit_mutex);
956 init_rwsem(&jfs_ip->xattr_sem);
957 spin_lock_init(&jfs_ip->ag_lock);
958 jfs_ip->active_ag = -1;
959 inode_init_once(&jfs_ip->vfs_inode);
960}
961
962static int __init init_jfs_fs(void)
963{
964 int i;
965 int rc;
966
967 jfs_inode_cachep =
968 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
969 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
970 offsetof(struct jfs_inode_info, i_inline),
971 sizeof_field(struct jfs_inode_info, i_inline),
972 init_once);
973 if (jfs_inode_cachep == NULL)
974 return -ENOMEM;
975
976 /*
977 * Metapage initialization
978 */
979 rc = metapage_init();
980 if (rc) {
981 jfs_err("metapage_init failed w/rc = %d", rc);
982 goto free_slab;
983 }
984
985 /*
986 * Transaction Manager initialization
987 */
988 rc = txInit();
989 if (rc) {
990 jfs_err("txInit failed w/rc = %d", rc);
991 goto free_metapage;
992 }
993
994 /*
995 * I/O completion thread (endio)
996 */
997 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
998 if (IS_ERR(jfsIOthread)) {
999 rc = PTR_ERR(jfsIOthread);
1000 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1001 goto end_txmngr;
1002 }
1003
1004 if (commit_threads < 1)
1005 commit_threads = num_online_cpus();
1006 if (commit_threads > MAX_COMMIT_THREADS)
1007 commit_threads = MAX_COMMIT_THREADS;
1008
1009 for (i = 0; i < commit_threads; i++) {
1010 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
1011 "jfsCommit");
1012 if (IS_ERR(jfsCommitThread[i])) {
1013 rc = PTR_ERR(jfsCommitThread[i]);
1014 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1015 commit_threads = i;
1016 goto kill_committask;
1017 }
1018 }
1019
1020 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
1021 if (IS_ERR(jfsSyncThread)) {
1022 rc = PTR_ERR(jfsSyncThread);
1023 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1024 goto kill_committask;
1025 }
1026
1027#ifdef PROC_FS_JFS
1028 jfs_proc_init();
1029#endif
1030
1031 rc = register_filesystem(&jfs_fs_type);
1032 if (!rc)
1033 return 0;
1034
1035#ifdef PROC_FS_JFS
1036 jfs_proc_clean();
1037#endif
1038 kthread_stop(jfsSyncThread);
1039kill_committask:
1040 for (i = 0; i < commit_threads; i++)
1041 kthread_stop(jfsCommitThread[i]);
1042 kthread_stop(jfsIOthread);
1043end_txmngr:
1044 txExit();
1045free_metapage:
1046 metapage_exit();
1047free_slab:
1048 kmem_cache_destroy(jfs_inode_cachep);
1049 return rc;
1050}
1051
1052static void __exit exit_jfs_fs(void)
1053{
1054 int i;
1055
1056 jfs_info("exit_jfs_fs called");
1057
1058 txExit();
1059 metapage_exit();
1060
1061 kthread_stop(jfsIOthread);
1062 for (i = 0; i < commit_threads; i++)
1063 kthread_stop(jfsCommitThread[i]);
1064 kthread_stop(jfsSyncThread);
1065#ifdef PROC_FS_JFS
1066 jfs_proc_clean();
1067#endif
1068 unregister_filesystem(&jfs_fs_type);
1069
1070 /*
1071 * Make sure all delayed rcu free inodes are flushed before we
1072 * destroy cache.
1073 */
1074 rcu_barrier();
1075 kmem_cache_destroy(jfs_inode_cachep);
1076}
1077
1078module_init(init_jfs_fs)
1079module_exit(exit_jfs_fs)
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
37MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
38MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
39MODULE_LICENSE("GPL");
40
41static struct kmem_cache *jfs_inode_cachep;
42
43static const struct super_operations jfs_super_operations;
44static const struct export_operations jfs_export_operations;
45static struct file_system_type jfs_fs_type;
46
47#define MAX_COMMIT_THREADS 64
48static int commit_threads;
49module_param(commit_threads, int, 0);
50MODULE_PARM_DESC(commit_threads, "Number of commit threads");
51
52static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
53struct task_struct *jfsIOthread;
54struct task_struct *jfsSyncThread;
55
56#ifdef CONFIG_JFS_DEBUG
57int jfsloglevel = JFS_LOGLEVEL_WARN;
58module_param(jfsloglevel, int, 0644);
59MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
60#endif
61
62static 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
83void 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
101static struct inode *jfs_alloc_inode(struct super_block *sb)
102{
103 struct jfs_inode_info *jfs_inode;
104
105 jfs_inode = kmem_cache_alloc(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
114static void jfs_free_inode(struct inode *inode)
115{
116 kmem_cache_free(jfs_inode_cachep, JFS_IP(inode));
117}
118
119static 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
157static int jfs_quota_off(struct super_block *sb, int type);
158static int jfs_quota_on(struct super_block *sb, int type, int format_id,
159 const struct path *path);
160
161static 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
169static 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
180static inline void jfs_quota_off_umount(struct super_block *sb)
181{
182}
183#endif
184
185static 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
206enum {
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
213static 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
233static 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 = i_size_read(sb->s_bdev->bd_inode) >>
288 sb->s_blocksize_bits;
289 if (*newLVSize == 0)
290 pr_err("JFS: Cannot determine volume size\n");
291 break;
292 }
293 case Opt_errors:
294 {
295 char *errors = args[0].from;
296 if (!errors || !*errors)
297 goto cleanup;
298 if (!strcmp(errors, "continue")) {
299 *flag &= ~JFS_ERR_REMOUNT_RO;
300 *flag &= ~JFS_ERR_PANIC;
301 *flag |= JFS_ERR_CONTINUE;
302 } else if (!strcmp(errors, "remount-ro")) {
303 *flag &= ~JFS_ERR_CONTINUE;
304 *flag &= ~JFS_ERR_PANIC;
305 *flag |= JFS_ERR_REMOUNT_RO;
306 } else if (!strcmp(errors, "panic")) {
307 *flag &= ~JFS_ERR_CONTINUE;
308 *flag &= ~JFS_ERR_REMOUNT_RO;
309 *flag |= JFS_ERR_PANIC;
310 } else {
311 pr_err("JFS: %s is an invalid error handler\n",
312 errors);
313 goto cleanup;
314 }
315 break;
316 }
317
318#ifdef CONFIG_QUOTA
319 case Opt_quota:
320 case Opt_usrquota:
321 *flag |= JFS_USRQUOTA;
322 break;
323 case Opt_grpquota:
324 *flag |= JFS_GRPQUOTA;
325 break;
326#else
327 case Opt_usrquota:
328 case Opt_grpquota:
329 case Opt_quota:
330 pr_err("JFS: quota operations not supported\n");
331 break;
332#endif
333 case Opt_uid:
334 {
335 char *uid = args[0].from;
336 uid_t val;
337 int rc = kstrtouint(uid, 0, &val);
338
339 if (rc)
340 goto cleanup;
341 sbi->uid = make_kuid(current_user_ns(), val);
342 if (!uid_valid(sbi->uid))
343 goto cleanup;
344 break;
345 }
346
347 case Opt_gid:
348 {
349 char *gid = args[0].from;
350 gid_t val;
351 int rc = kstrtouint(gid, 0, &val);
352
353 if (rc)
354 goto cleanup;
355 sbi->gid = make_kgid(current_user_ns(), val);
356 if (!gid_valid(sbi->gid))
357 goto cleanup;
358 break;
359 }
360
361 case Opt_umask:
362 {
363 char *umask = args[0].from;
364 int rc = kstrtouint(umask, 8, &sbi->umask);
365
366 if (rc)
367 goto cleanup;
368 if (sbi->umask & ~0777) {
369 pr_err("JFS: Invalid value of umask\n");
370 goto cleanup;
371 }
372 break;
373 }
374
375 case Opt_discard:
376 {
377 struct request_queue *q = bdev_get_queue(sb->s_bdev);
378 /* if set to 1, even copying files will cause
379 * trimming :O
380 * -> user has more control over the online trimming
381 */
382 sbi->minblks_trim = 64;
383 if (blk_queue_discard(q))
384 *flag |= JFS_DISCARD;
385 else
386 pr_err("JFS: discard option not supported on device\n");
387 break;
388 }
389
390 case Opt_nodiscard:
391 *flag &= ~JFS_DISCARD;
392 break;
393
394 case Opt_discard_minblk:
395 {
396 struct request_queue *q = bdev_get_queue(sb->s_bdev);
397 char *minblks_trim = args[0].from;
398 int rc;
399 if (blk_queue_discard(q)) {
400 *flag |= JFS_DISCARD;
401 rc = kstrtouint(minblks_trim, 0,
402 &sbi->minblks_trim);
403 if (rc)
404 goto cleanup;
405 } else
406 pr_err("JFS: discard option not supported on device\n");
407 break;
408 }
409
410 default:
411 printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
412 p);
413 goto cleanup;
414 }
415 }
416
417 if (nls_map != (void *) -1) {
418 /* Discard old (if remount) */
419 unload_nls(sbi->nls_tab);
420 sbi->nls_tab = nls_map;
421 }
422 return 1;
423
424cleanup:
425 if (nls_map && nls_map != (void *) -1)
426 unload_nls(nls_map);
427 return 0;
428}
429
430static int jfs_remount(struct super_block *sb, int *flags, char *data)
431{
432 s64 newLVSize = 0;
433 int rc = 0;
434 int flag = JFS_SBI(sb)->flag;
435 int ret;
436
437 sync_filesystem(sb);
438 if (!parse_options(data, sb, &newLVSize, &flag))
439 return -EINVAL;
440
441 if (newLVSize) {
442 if (sb_rdonly(sb)) {
443 pr_err("JFS: resize requires volume to be mounted read-write\n");
444 return -EROFS;
445 }
446 rc = jfs_extendfs(sb, newLVSize, 0);
447 if (rc)
448 return rc;
449 }
450
451 if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) {
452 /*
453 * Invalidate any previously read metadata. fsck may have
454 * changed the on-disk data since we mounted r/o
455 */
456 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
457
458 JFS_SBI(sb)->flag = flag;
459 ret = jfs_mount_rw(sb, 1);
460
461 /* mark the fs r/w for quota activity */
462 sb->s_flags &= ~SB_RDONLY;
463
464 dquot_resume(sb, -1);
465 return ret;
466 }
467 if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) {
468 rc = dquot_suspend(sb, -1);
469 if (rc < 0)
470 return rc;
471 rc = jfs_umount_rw(sb);
472 JFS_SBI(sb)->flag = flag;
473 return rc;
474 }
475 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
476 if (!sb_rdonly(sb)) {
477 rc = jfs_umount_rw(sb);
478 if (rc)
479 return rc;
480
481 JFS_SBI(sb)->flag = flag;
482 ret = jfs_mount_rw(sb, 1);
483 return ret;
484 }
485 JFS_SBI(sb)->flag = flag;
486
487 return 0;
488}
489
490static int jfs_fill_super(struct super_block *sb, void *data, int silent)
491{
492 struct jfs_sb_info *sbi;
493 struct inode *inode;
494 int rc;
495 s64 newLVSize = 0;
496 int flag, ret = -EINVAL;
497
498 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
499
500 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
501 if (!sbi)
502 return -ENOMEM;
503
504 sb->s_fs_info = sbi;
505 sb->s_max_links = JFS_LINK_MAX;
506 sb->s_time_min = 0;
507 sb->s_time_max = U32_MAX;
508 sbi->sb = sb;
509 sbi->uid = INVALID_UID;
510 sbi->gid = INVALID_GID;
511 sbi->umask = -1;
512
513 /* initialize the mount flag and determine the default error handler */
514 flag = JFS_ERR_REMOUNT_RO;
515
516 if (!parse_options((char *) data, sb, &newLVSize, &flag))
517 goto out_kfree;
518 sbi->flag = flag;
519
520#ifdef CONFIG_JFS_POSIX_ACL
521 sb->s_flags |= SB_POSIXACL;
522#endif
523
524 if (newLVSize) {
525 pr_err("resize option for remount only\n");
526 goto out_kfree;
527 }
528
529 /*
530 * Initialize blocksize to 4K.
531 */
532 sb_set_blocksize(sb, PSIZE);
533
534 /*
535 * Set method vectors.
536 */
537 sb->s_op = &jfs_super_operations;
538 sb->s_export_op = &jfs_export_operations;
539 sb->s_xattr = jfs_xattr_handlers;
540#ifdef CONFIG_QUOTA
541 sb->dq_op = &dquot_operations;
542 sb->s_qcop = &jfs_quotactl_ops;
543 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
544#endif
545
546 /*
547 * Initialize direct-mapping inode/address-space
548 */
549 inode = new_inode(sb);
550 if (inode == NULL) {
551 ret = -ENOMEM;
552 goto out_unload;
553 }
554 inode->i_size = i_size_read(sb->s_bdev->bd_inode);
555 inode->i_mapping->a_ops = &jfs_metapage_aops;
556 inode_fake_hash(inode);
557 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
558
559 sbi->direct_inode = inode;
560
561 rc = jfs_mount(sb);
562 if (rc) {
563 if (!silent)
564 jfs_err("jfs_mount failed w/return code = %d", rc);
565 goto out_mount_failed;
566 }
567 if (sb_rdonly(sb))
568 sbi->log = NULL;
569 else {
570 rc = jfs_mount_rw(sb, 0);
571 if (rc) {
572 if (!silent) {
573 jfs_err("jfs_mount_rw failed, return code = %d",
574 rc);
575 }
576 goto out_no_rw;
577 }
578 }
579
580 sb->s_magic = JFS_SUPER_MAGIC;
581
582 if (sbi->mntflag & JFS_OS2)
583 sb->s_d_op = &jfs_ci_dentry_operations;
584
585 inode = jfs_iget(sb, ROOT_I);
586 if (IS_ERR(inode)) {
587 ret = PTR_ERR(inode);
588 goto out_no_rw;
589 }
590 sb->s_root = d_make_root(inode);
591 if (!sb->s_root)
592 goto out_no_root;
593
594 /* logical blocks are represented by 40 bits in pxd_t, etc.
595 * and page cache is indexed by long
596 */
597 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE);
598 sb->s_time_gran = 1;
599 return 0;
600
601out_no_root:
602 jfs_err("jfs_read_super: get root dentry failed");
603
604out_no_rw:
605 rc = jfs_umount(sb);
606 if (rc)
607 jfs_err("jfs_umount failed with return code %d", rc);
608out_mount_failed:
609 filemap_write_and_wait(sbi->direct_inode->i_mapping);
610 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
611 make_bad_inode(sbi->direct_inode);
612 iput(sbi->direct_inode);
613 sbi->direct_inode = NULL;
614out_unload:
615 unload_nls(sbi->nls_tab);
616out_kfree:
617 kfree(sbi);
618 return ret;
619}
620
621static int jfs_freeze(struct super_block *sb)
622{
623 struct jfs_sb_info *sbi = JFS_SBI(sb);
624 struct jfs_log *log = sbi->log;
625 int rc = 0;
626
627 if (!sb_rdonly(sb)) {
628 txQuiesce(sb);
629 rc = lmLogShutdown(log);
630 if (rc) {
631 jfs_error(sb, "lmLogShutdown failed\n");
632
633 /* let operations fail rather than hang */
634 txResume(sb);
635
636 return rc;
637 }
638 rc = updateSuper(sb, FM_CLEAN);
639 if (rc) {
640 jfs_err("jfs_freeze: updateSuper failed");
641 /*
642 * Don't fail here. Everything succeeded except
643 * marking the superblock clean, so there's really
644 * no harm in leaving it frozen for now.
645 */
646 }
647 }
648 return 0;
649}
650
651static int jfs_unfreeze(struct super_block *sb)
652{
653 struct jfs_sb_info *sbi = JFS_SBI(sb);
654 struct jfs_log *log = sbi->log;
655 int rc = 0;
656
657 if (!sb_rdonly(sb)) {
658 rc = updateSuper(sb, FM_MOUNT);
659 if (rc) {
660 jfs_error(sb, "updateSuper failed\n");
661 goto out;
662 }
663 rc = lmLogInit(log);
664 if (rc)
665 jfs_error(sb, "lmLogInit failed\n");
666out:
667 txResume(sb);
668 }
669 return rc;
670}
671
672static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
673 int flags, const char *dev_name, void *data)
674{
675 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
676}
677
678static int jfs_sync_fs(struct super_block *sb, int wait)
679{
680 struct jfs_log *log = JFS_SBI(sb)->log;
681
682 /* log == NULL indicates read-only mount */
683 if (log) {
684 /*
685 * Write quota structures to quota file, sync_blockdev() will
686 * write them to disk later
687 */
688 dquot_writeback_dquots(sb, -1);
689 jfs_flush_journal(log, wait);
690 jfs_syncpt(log, 0);
691 }
692
693 return 0;
694}
695
696static int jfs_show_options(struct seq_file *seq, struct dentry *root)
697{
698 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
699
700 if (uid_valid(sbi->uid))
701 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
702 if (gid_valid(sbi->gid))
703 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
704 if (sbi->umask != -1)
705 seq_printf(seq, ",umask=%03o", sbi->umask);
706 if (sbi->flag & JFS_NOINTEGRITY)
707 seq_puts(seq, ",nointegrity");
708 if (sbi->flag & JFS_DISCARD)
709 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
710 if (sbi->nls_tab)
711 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
712 if (sbi->flag & JFS_ERR_CONTINUE)
713 seq_printf(seq, ",errors=continue");
714 if (sbi->flag & JFS_ERR_PANIC)
715 seq_printf(seq, ",errors=panic");
716
717#ifdef CONFIG_QUOTA
718 if (sbi->flag & JFS_USRQUOTA)
719 seq_puts(seq, ",usrquota");
720
721 if (sbi->flag & JFS_GRPQUOTA)
722 seq_puts(seq, ",grpquota");
723#endif
724
725 return 0;
726}
727
728#ifdef CONFIG_QUOTA
729
730/* Read data from quotafile - avoid pagecache and such because we cannot afford
731 * acquiring the locks... As quota files are never truncated and quota code
732 * itself serializes the operations (and no one else should touch the files)
733 * we don't have to be afraid of races */
734static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
735 size_t len, loff_t off)
736{
737 struct inode *inode = sb_dqopt(sb)->files[type];
738 sector_t blk = off >> sb->s_blocksize_bits;
739 int err = 0;
740 int offset = off & (sb->s_blocksize - 1);
741 int tocopy;
742 size_t toread;
743 struct buffer_head tmp_bh;
744 struct buffer_head *bh;
745 loff_t i_size = i_size_read(inode);
746
747 if (off > i_size)
748 return 0;
749 if (off+len > i_size)
750 len = i_size-off;
751 toread = len;
752 while (toread > 0) {
753 tocopy = sb->s_blocksize - offset < toread ?
754 sb->s_blocksize - offset : toread;
755
756 tmp_bh.b_state = 0;
757 tmp_bh.b_size = i_blocksize(inode);
758 err = jfs_get_block(inode, blk, &tmp_bh, 0);
759 if (err)
760 return err;
761 if (!buffer_mapped(&tmp_bh)) /* A hole? */
762 memset(data, 0, tocopy);
763 else {
764 bh = sb_bread(sb, tmp_bh.b_blocknr);
765 if (!bh)
766 return -EIO;
767 memcpy(data, bh->b_data+offset, tocopy);
768 brelse(bh);
769 }
770 offset = 0;
771 toread -= tocopy;
772 data += tocopy;
773 blk++;
774 }
775 return len;
776}
777
778/* Write to quotafile */
779static ssize_t jfs_quota_write(struct super_block *sb, int type,
780 const char *data, size_t len, loff_t off)
781{
782 struct inode *inode = sb_dqopt(sb)->files[type];
783 sector_t blk = off >> sb->s_blocksize_bits;
784 int err = 0;
785 int offset = off & (sb->s_blocksize - 1);
786 int tocopy;
787 size_t towrite = len;
788 struct buffer_head tmp_bh;
789 struct buffer_head *bh;
790
791 inode_lock(inode);
792 while (towrite > 0) {
793 tocopy = sb->s_blocksize - offset < towrite ?
794 sb->s_blocksize - offset : towrite;
795
796 tmp_bh.b_state = 0;
797 tmp_bh.b_size = i_blocksize(inode);
798 err = jfs_get_block(inode, blk, &tmp_bh, 1);
799 if (err)
800 goto out;
801 if (offset || tocopy != sb->s_blocksize)
802 bh = sb_bread(sb, tmp_bh.b_blocknr);
803 else
804 bh = sb_getblk(sb, tmp_bh.b_blocknr);
805 if (!bh) {
806 err = -EIO;
807 goto out;
808 }
809 lock_buffer(bh);
810 memcpy(bh->b_data+offset, data, tocopy);
811 flush_dcache_page(bh->b_page);
812 set_buffer_uptodate(bh);
813 mark_buffer_dirty(bh);
814 unlock_buffer(bh);
815 brelse(bh);
816 offset = 0;
817 towrite -= tocopy;
818 data += tocopy;
819 blk++;
820 }
821out:
822 if (len == towrite) {
823 inode_unlock(inode);
824 return err;
825 }
826 if (inode->i_size < off+len-towrite)
827 i_size_write(inode, off+len-towrite);
828 inode->i_mtime = inode->i_ctime = current_time(inode);
829 mark_inode_dirty(inode);
830 inode_unlock(inode);
831 return len - towrite;
832}
833
834static struct dquot **jfs_get_dquots(struct inode *inode)
835{
836 return JFS_IP(inode)->i_dquot;
837}
838
839static int jfs_quota_on(struct super_block *sb, int type, int format_id,
840 const struct path *path)
841{
842 int err;
843 struct inode *inode;
844
845 err = dquot_quota_on(sb, type, format_id, path);
846 if (err)
847 return err;
848
849 inode = d_inode(path->dentry);
850 inode_lock(inode);
851 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
852 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
853 S_NOATIME | S_IMMUTABLE);
854 inode_unlock(inode);
855 mark_inode_dirty(inode);
856
857 return 0;
858}
859
860static int jfs_quota_off(struct super_block *sb, int type)
861{
862 struct inode *inode = sb_dqopt(sb)->files[type];
863 int err;
864
865 if (!inode || !igrab(inode))
866 goto out;
867
868 err = dquot_quota_off(sb, type);
869 if (err)
870 goto out_put;
871
872 inode_lock(inode);
873 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
874 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
875 inode_unlock(inode);
876 mark_inode_dirty(inode);
877out_put:
878 iput(inode);
879 return err;
880out:
881 return dquot_quota_off(sb, type);
882}
883#endif
884
885static const struct super_operations jfs_super_operations = {
886 .alloc_inode = jfs_alloc_inode,
887 .free_inode = jfs_free_inode,
888 .dirty_inode = jfs_dirty_inode,
889 .write_inode = jfs_write_inode,
890 .evict_inode = jfs_evict_inode,
891 .put_super = jfs_put_super,
892 .sync_fs = jfs_sync_fs,
893 .freeze_fs = jfs_freeze,
894 .unfreeze_fs = jfs_unfreeze,
895 .statfs = jfs_statfs,
896 .remount_fs = jfs_remount,
897 .show_options = jfs_show_options,
898#ifdef CONFIG_QUOTA
899 .quota_read = jfs_quota_read,
900 .quota_write = jfs_quota_write,
901 .get_dquots = jfs_get_dquots,
902#endif
903};
904
905static const struct export_operations jfs_export_operations = {
906 .fh_to_dentry = jfs_fh_to_dentry,
907 .fh_to_parent = jfs_fh_to_parent,
908 .get_parent = jfs_get_parent,
909};
910
911static struct file_system_type jfs_fs_type = {
912 .owner = THIS_MODULE,
913 .name = "jfs",
914 .mount = jfs_do_mount,
915 .kill_sb = kill_block_super,
916 .fs_flags = FS_REQUIRES_DEV,
917};
918MODULE_ALIAS_FS("jfs");
919
920static void init_once(void *foo)
921{
922 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
923
924 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
925 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
926 init_rwsem(&jfs_ip->rdwrlock);
927 mutex_init(&jfs_ip->commit_mutex);
928 init_rwsem(&jfs_ip->xattr_sem);
929 spin_lock_init(&jfs_ip->ag_lock);
930 jfs_ip->active_ag = -1;
931 inode_init_once(&jfs_ip->vfs_inode);
932}
933
934static int __init init_jfs_fs(void)
935{
936 int i;
937 int rc;
938
939 jfs_inode_cachep =
940 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
941 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
942 offsetof(struct jfs_inode_info, i_inline_all),
943 sizeof_field(struct jfs_inode_info, i_inline_all),
944 init_once);
945 if (jfs_inode_cachep == NULL)
946 return -ENOMEM;
947
948 /*
949 * Metapage initialization
950 */
951 rc = metapage_init();
952 if (rc) {
953 jfs_err("metapage_init failed w/rc = %d", rc);
954 goto free_slab;
955 }
956
957 /*
958 * Transaction Manager initialization
959 */
960 rc = txInit();
961 if (rc) {
962 jfs_err("txInit failed w/rc = %d", rc);
963 goto free_metapage;
964 }
965
966 /*
967 * I/O completion thread (endio)
968 */
969 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
970 if (IS_ERR(jfsIOthread)) {
971 rc = PTR_ERR(jfsIOthread);
972 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
973 goto end_txmngr;
974 }
975
976 if (commit_threads < 1)
977 commit_threads = num_online_cpus();
978 if (commit_threads > MAX_COMMIT_THREADS)
979 commit_threads = MAX_COMMIT_THREADS;
980
981 for (i = 0; i < commit_threads; i++) {
982 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
983 "jfsCommit");
984 if (IS_ERR(jfsCommitThread[i])) {
985 rc = PTR_ERR(jfsCommitThread[i]);
986 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
987 commit_threads = i;
988 goto kill_committask;
989 }
990 }
991
992 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
993 if (IS_ERR(jfsSyncThread)) {
994 rc = PTR_ERR(jfsSyncThread);
995 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
996 goto kill_committask;
997 }
998
999#ifdef PROC_FS_JFS
1000 jfs_proc_init();
1001#endif
1002
1003 rc = register_filesystem(&jfs_fs_type);
1004 if (!rc)
1005 return 0;
1006
1007#ifdef PROC_FS_JFS
1008 jfs_proc_clean();
1009#endif
1010 kthread_stop(jfsSyncThread);
1011kill_committask:
1012 for (i = 0; i < commit_threads; i++)
1013 kthread_stop(jfsCommitThread[i]);
1014 kthread_stop(jfsIOthread);
1015end_txmngr:
1016 txExit();
1017free_metapage:
1018 metapage_exit();
1019free_slab:
1020 kmem_cache_destroy(jfs_inode_cachep);
1021 return rc;
1022}
1023
1024static void __exit exit_jfs_fs(void)
1025{
1026 int i;
1027
1028 jfs_info("exit_jfs_fs called");
1029
1030 txExit();
1031 metapage_exit();
1032
1033 kthread_stop(jfsIOthread);
1034 for (i = 0; i < commit_threads; i++)
1035 kthread_stop(jfsCommitThread[i]);
1036 kthread_stop(jfsSyncThread);
1037#ifdef PROC_FS_JFS
1038 jfs_proc_clean();
1039#endif
1040 unregister_filesystem(&jfs_fs_type);
1041
1042 /*
1043 * Make sure all delayed rcu free inodes are flushed before we
1044 * destroy cache.
1045 */
1046 rcu_barrier();
1047 kmem_cache_destroy(jfs_inode_cachep);
1048}
1049
1050module_init(init_jfs_fs)
1051module_exit(exit_jfs_fs)