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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/completion.h>
10#include <linux/vfs.h>
11#include <linux/quotaops.h>
12#include <linux/fs_context.h>
13#include <linux/fs_parser.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 = 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
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 struct constant_table jfs_param_errors[] = {
214 {"continue", JFS_ERR_CONTINUE},
215 {"remount-ro", JFS_ERR_REMOUNT_RO},
216 {"panic", JFS_ERR_PANIC},
217 {}
218};
219
220static const struct fs_parameter_spec jfs_param_spec[] = {
221 fsparam_flag_no ("integrity", Opt_integrity),
222 fsparam_string ("iocharset", Opt_iocharset),
223 fsparam_u64 ("resize", Opt_resize),
224 fsparam_flag ("resize", Opt_resize_nosize),
225 fsparam_enum ("errors", Opt_errors, jfs_param_errors),
226 fsparam_flag ("quota", Opt_quota),
227 fsparam_flag ("noquota", Opt_ignore),
228 fsparam_flag ("usrquota", Opt_usrquota),
229 fsparam_flag ("grpquota", Opt_grpquota),
230 fsparam_uid ("uid", Opt_uid),
231 fsparam_gid ("gid", Opt_gid),
232 fsparam_u32oct ("umask", Opt_umask),
233 fsparam_flag ("discard", Opt_discard),
234 fsparam_u32 ("discard", Opt_discard_minblk),
235 fsparam_flag ("nodiscard", Opt_nodiscard),
236 {}
237};
238
239struct jfs_context {
240 int flag;
241 kuid_t uid;
242 kgid_t gid;
243 uint umask;
244 uint minblks_trim;
245 void *nls_map;
246 bool resize;
247 s64 newLVSize;
248};
249
250static int jfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
251{
252 struct jfs_context *ctx = fc->fs_private;
253 int reconfigure = (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE);
254 struct fs_parse_result result;
255 struct nls_table *nls_map;
256 int opt;
257
258 opt = fs_parse(fc, jfs_param_spec, param, &result);
259 if (opt < 0)
260 return opt;
261
262 switch (opt) {
263 case Opt_integrity:
264 if (result.negated)
265 ctx->flag |= JFS_NOINTEGRITY;
266 else
267 ctx->flag &= ~JFS_NOINTEGRITY;
268 break;
269 case Opt_ignore:
270 /* Silently ignore the quota options */
271 /* Don't do anything ;-) */
272 break;
273 case Opt_iocharset:
274 if (ctx->nls_map && ctx->nls_map != (void *) -1) {
275 unload_nls(ctx->nls_map);
276 ctx->nls_map = NULL;
277 }
278 if (!strcmp(param->string, "none"))
279 ctx->nls_map = NULL;
280 else {
281 nls_map = load_nls(param->string);
282 if (!nls_map) {
283 pr_err("JFS: charset not found\n");
284 return -EINVAL;
285 }
286 ctx->nls_map = nls_map;
287 }
288 break;
289 case Opt_resize:
290 if (!reconfigure)
291 return -EINVAL;
292 ctx->resize = true;
293 ctx->newLVSize = result.uint_64;
294 break;
295 case Opt_resize_nosize:
296 if (!reconfigure)
297 return -EINVAL;
298 ctx->resize = true;
299 break;
300 case Opt_errors:
301 ctx->flag &= ~JFS_ERR_MASK;
302 ctx->flag |= result.uint_32;
303 break;
304
305#ifdef CONFIG_QUOTA
306 case Opt_quota:
307 case Opt_usrquota:
308 ctx->flag |= JFS_USRQUOTA;
309 break;
310 case Opt_grpquota:
311 ctx->flag |= JFS_GRPQUOTA;
312 break;
313#else
314 case Opt_usrquota:
315 case Opt_grpquota:
316 case Opt_quota:
317 pr_err("JFS: quota operations not supported\n");
318 break;
319#endif
320 case Opt_uid:
321 ctx->uid = result.uid;
322 break;
323
324 case Opt_gid:
325 ctx->gid = result.gid;
326 break;
327
328 case Opt_umask:
329 if (result.uint_32 & ~0777) {
330 pr_err("JFS: Invalid value of umask\n");
331 return -EINVAL;
332 }
333 ctx->umask = result.uint_32;
334 break;
335
336 case Opt_discard:
337 /* if set to 1, even copying files will cause
338 * trimming :O
339 * -> user has more control over the online trimming
340 */
341 ctx->minblks_trim = 64;
342 ctx->flag |= JFS_DISCARD;
343 break;
344
345 case Opt_nodiscard:
346 ctx->flag &= ~JFS_DISCARD;
347 break;
348
349 case Opt_discard_minblk:
350 ctx->minblks_trim = result.uint_32;
351 ctx->flag |= JFS_DISCARD;
352 break;
353
354 default:
355 return -EINVAL;
356 }
357
358 return 0;
359}
360
361static int jfs_reconfigure(struct fs_context *fc)
362{
363 struct jfs_context *ctx = fc->fs_private;
364 struct super_block *sb = fc->root->d_sb;
365 int readonly = fc->sb_flags & SB_RDONLY;
366 int rc = 0;
367 int flag = ctx->flag;
368 int ret;
369
370 sync_filesystem(sb);
371
372 /* Transfer results of parsing to the sbi */
373 JFS_SBI(sb)->flag = ctx->flag;
374 JFS_SBI(sb)->uid = ctx->uid;
375 JFS_SBI(sb)->gid = ctx->gid;
376 JFS_SBI(sb)->umask = ctx->umask;
377 JFS_SBI(sb)->minblks_trim = ctx->minblks_trim;
378 if (ctx->nls_map != (void *) -1) {
379 unload_nls(JFS_SBI(sb)->nls_tab);
380 JFS_SBI(sb)->nls_tab = ctx->nls_map;
381 }
382 ctx->nls_map = NULL;
383
384 if (ctx->resize) {
385 if (sb_rdonly(sb)) {
386 pr_err("JFS: resize requires volume to be mounted read-write\n");
387 return -EROFS;
388 }
389
390 if (!ctx->newLVSize) {
391 ctx->newLVSize = sb_bdev_nr_blocks(sb);
392 if (ctx->newLVSize == 0)
393 pr_err("JFS: Cannot determine volume size\n");
394 }
395
396 rc = jfs_extendfs(sb, ctx->newLVSize, 0);
397 if (rc)
398 return rc;
399 }
400
401 if (sb_rdonly(sb) && !readonly) {
402 /*
403 * Invalidate any previously read metadata. fsck may have
404 * changed the on-disk data since we mounted r/o
405 */
406 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
407
408 JFS_SBI(sb)->flag = flag;
409 ret = jfs_mount_rw(sb, 1);
410
411 /* mark the fs r/w for quota activity */
412 sb->s_flags &= ~SB_RDONLY;
413
414 dquot_resume(sb, -1);
415 return ret;
416 }
417 if (!sb_rdonly(sb) && readonly) {
418 rc = dquot_suspend(sb, -1);
419 if (rc < 0)
420 return rc;
421 rc = jfs_umount_rw(sb);
422 JFS_SBI(sb)->flag = flag;
423 return rc;
424 }
425 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) {
426 if (!sb_rdonly(sb)) {
427 rc = jfs_umount_rw(sb);
428 if (rc)
429 return rc;
430
431 JFS_SBI(sb)->flag = flag;
432 ret = jfs_mount_rw(sb, 1);
433 return ret;
434 }
435 }
436 JFS_SBI(sb)->flag = flag;
437
438 return 0;
439}
440
441static int jfs_fill_super(struct super_block *sb, struct fs_context *fc)
442{
443 struct jfs_context *ctx = fc->fs_private;
444 int silent = fc->sb_flags & SB_SILENT;
445 struct jfs_sb_info *sbi;
446 struct inode *inode;
447 int rc;
448 int ret = -EINVAL;
449
450 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
451
452 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
453 if (!sbi)
454 return -ENOMEM;
455
456 sb->s_fs_info = sbi;
457 sb->s_max_links = JFS_LINK_MAX;
458 sb->s_time_min = 0;
459 sb->s_time_max = U32_MAX;
460 sbi->sb = sb;
461
462 /* Transfer results of parsing to the sbi */
463 sbi->flag = ctx->flag;
464 sbi->uid = ctx->uid;
465 sbi->gid = ctx->gid;
466 sbi->umask = ctx->umask;
467 if (ctx->nls_map != (void *) -1) {
468 unload_nls(sbi->nls_tab);
469 sbi->nls_tab = ctx->nls_map;
470 }
471 ctx->nls_map = NULL;
472
473 if (sbi->flag & JFS_DISCARD) {
474 if (!bdev_max_discard_sectors(sb->s_bdev)) {
475 pr_err("JFS: discard option not supported on device\n");
476 sbi->flag &= ~JFS_DISCARD;
477 } else {
478 sbi->minblks_trim = ctx->minblks_trim;
479 }
480 }
481
482#ifdef CONFIG_JFS_POSIX_ACL
483 sb->s_flags |= SB_POSIXACL;
484#endif
485
486 if (ctx->resize) {
487 pr_err("resize option for remount only\n");
488 goto out_unload;
489 }
490
491 /*
492 * Initialize blocksize to 4K.
493 */
494 sb_set_blocksize(sb, PSIZE);
495
496 /*
497 * Set method vectors.
498 */
499 sb->s_op = &jfs_super_operations;
500 sb->s_export_op = &jfs_export_operations;
501 sb->s_xattr = jfs_xattr_handlers;
502#ifdef CONFIG_QUOTA
503 sb->dq_op = &dquot_operations;
504 sb->s_qcop = &jfs_quotactl_ops;
505 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
506#endif
507
508 /*
509 * Initialize direct-mapping inode/address-space
510 */
511 inode = new_inode(sb);
512 if (inode == NULL) {
513 ret = -ENOMEM;
514 goto out_unload;
515 }
516 inode->i_size = bdev_nr_bytes(sb->s_bdev);
517 inode->i_mapping->a_ops = &jfs_metapage_aops;
518 inode_fake_hash(inode);
519 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
520
521 sbi->direct_inode = inode;
522
523 rc = jfs_mount(sb);
524 if (rc) {
525 if (!silent)
526 jfs_err("jfs_mount failed w/return code = %d", rc);
527 goto out_mount_failed;
528 }
529 if (sb_rdonly(sb))
530 sbi->log = NULL;
531 else {
532 rc = jfs_mount_rw(sb, 0);
533 if (rc) {
534 if (!silent) {
535 jfs_err("jfs_mount_rw failed, return code = %d",
536 rc);
537 }
538 goto out_no_rw;
539 }
540 }
541
542 sb->s_magic = JFS_SUPER_MAGIC;
543
544 if (sbi->mntflag & JFS_OS2)
545 sb->s_d_op = &jfs_ci_dentry_operations;
546
547 inode = jfs_iget(sb, ROOT_I);
548 if (IS_ERR(inode)) {
549 ret = PTR_ERR(inode);
550 goto out_no_rw;
551 }
552 sb->s_root = d_make_root(inode);
553 if (!sb->s_root)
554 goto out_no_root;
555
556 /* logical blocks are represented by 40 bits in pxd_t, etc.
557 * and page cache is indexed by long
558 */
559 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE);
560 sb->s_time_gran = 1;
561 return 0;
562
563out_no_root:
564 jfs_err("jfs_read_super: get root dentry failed");
565
566out_no_rw:
567 rc = jfs_umount(sb);
568 if (rc)
569 jfs_err("jfs_umount failed with return code %d", rc);
570out_mount_failed:
571 filemap_write_and_wait(sbi->direct_inode->i_mapping);
572 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
573 make_bad_inode(sbi->direct_inode);
574 iput(sbi->direct_inode);
575 sbi->direct_inode = NULL;
576out_unload:
577 unload_nls(sbi->nls_tab);
578 kfree(sbi);
579 return ret;
580}
581
582static int jfs_freeze(struct super_block *sb)
583{
584 struct jfs_sb_info *sbi = JFS_SBI(sb);
585 struct jfs_log *log = sbi->log;
586 int rc = 0;
587
588 if (!sb_rdonly(sb)) {
589 txQuiesce(sb);
590 rc = lmLogShutdown(log);
591 if (rc) {
592 jfs_error(sb, "lmLogShutdown failed\n");
593
594 /* let operations fail rather than hang */
595 txResume(sb);
596
597 return rc;
598 }
599 rc = updateSuper(sb, FM_CLEAN);
600 if (rc) {
601 jfs_err("jfs_freeze: updateSuper failed");
602 /*
603 * Don't fail here. Everything succeeded except
604 * marking the superblock clean, so there's really
605 * no harm in leaving it frozen for now.
606 */
607 }
608 }
609 return 0;
610}
611
612static int jfs_unfreeze(struct super_block *sb)
613{
614 struct jfs_sb_info *sbi = JFS_SBI(sb);
615 struct jfs_log *log = sbi->log;
616 int rc = 0;
617
618 if (!sb_rdonly(sb)) {
619 rc = updateSuper(sb, FM_MOUNT);
620 if (rc) {
621 jfs_error(sb, "updateSuper failed\n");
622 goto out;
623 }
624 rc = lmLogInit(log);
625 if (rc)
626 jfs_error(sb, "lmLogInit failed\n");
627out:
628 txResume(sb);
629 }
630 return rc;
631}
632
633static int jfs_get_tree(struct fs_context *fc)
634{
635 return get_tree_bdev(fc, jfs_fill_super);
636}
637
638static int jfs_sync_fs(struct super_block *sb, int wait)
639{
640 struct jfs_log *log = JFS_SBI(sb)->log;
641
642 /* log == NULL indicates read-only mount */
643 if (log) {
644 /*
645 * Write quota structures to quota file, sync_blockdev() will
646 * write them to disk later
647 */
648 dquot_writeback_dquots(sb, -1);
649 jfs_flush_journal(log, wait);
650 jfs_syncpt(log, 0);
651 }
652
653 return 0;
654}
655
656static int jfs_show_options(struct seq_file *seq, struct dentry *root)
657{
658 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
659
660 if (uid_valid(sbi->uid))
661 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
662 if (gid_valid(sbi->gid))
663 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
664 if (sbi->umask != -1)
665 seq_printf(seq, ",umask=%03o", sbi->umask);
666 if (sbi->flag & JFS_NOINTEGRITY)
667 seq_puts(seq, ",nointegrity");
668 if (sbi->flag & JFS_DISCARD)
669 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
670 if (sbi->nls_tab)
671 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
672 if (sbi->flag & JFS_ERR_CONTINUE)
673 seq_printf(seq, ",errors=continue");
674 if (sbi->flag & JFS_ERR_PANIC)
675 seq_printf(seq, ",errors=panic");
676
677#ifdef CONFIG_QUOTA
678 if (sbi->flag & JFS_USRQUOTA)
679 seq_puts(seq, ",usrquota");
680
681 if (sbi->flag & JFS_GRPQUOTA)
682 seq_puts(seq, ",grpquota");
683#endif
684
685 return 0;
686}
687
688#ifdef CONFIG_QUOTA
689
690/* Read data from quotafile - avoid pagecache and such because we cannot afford
691 * acquiring the locks... As quota files are never truncated and quota code
692 * itself serializes the operations (and no one else should touch the files)
693 * we don't have to be afraid of races */
694static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
695 size_t len, loff_t off)
696{
697 struct inode *inode = sb_dqopt(sb)->files[type];
698 sector_t blk = off >> sb->s_blocksize_bits;
699 int err = 0;
700 int offset = off & (sb->s_blocksize - 1);
701 int tocopy;
702 size_t toread;
703 struct buffer_head tmp_bh;
704 struct buffer_head *bh;
705 loff_t i_size = i_size_read(inode);
706
707 if (off > i_size)
708 return 0;
709 if (off+len > i_size)
710 len = i_size-off;
711 toread = len;
712 while (toread > 0) {
713 tocopy = min_t(size_t, sb->s_blocksize - offset, toread);
714
715 tmp_bh.b_state = 0;
716 tmp_bh.b_size = i_blocksize(inode);
717 err = jfs_get_block(inode, blk, &tmp_bh, 0);
718 if (err)
719 return err;
720 if (!buffer_mapped(&tmp_bh)) /* A hole? */
721 memset(data, 0, tocopy);
722 else {
723 bh = sb_bread(sb, tmp_bh.b_blocknr);
724 if (!bh)
725 return -EIO;
726 memcpy(data, bh->b_data+offset, tocopy);
727 brelse(bh);
728 }
729 offset = 0;
730 toread -= tocopy;
731 data += tocopy;
732 blk++;
733 }
734 return len;
735}
736
737/* Write to quotafile */
738static ssize_t jfs_quota_write(struct super_block *sb, int type,
739 const char *data, size_t len, loff_t off)
740{
741 struct inode *inode = sb_dqopt(sb)->files[type];
742 sector_t blk = off >> sb->s_blocksize_bits;
743 int err = 0;
744 int offset = off & (sb->s_blocksize - 1);
745 int tocopy;
746 size_t towrite = len;
747 struct buffer_head tmp_bh;
748 struct buffer_head *bh;
749
750 inode_lock(inode);
751 while (towrite > 0) {
752 tocopy = min_t(size_t, sb->s_blocksize - offset, towrite);
753
754 tmp_bh.b_state = 0;
755 tmp_bh.b_size = i_blocksize(inode);
756 err = jfs_get_block(inode, blk, &tmp_bh, 1);
757 if (err)
758 goto out;
759 if (offset || tocopy != sb->s_blocksize)
760 bh = sb_bread(sb, tmp_bh.b_blocknr);
761 else
762 bh = sb_getblk(sb, tmp_bh.b_blocknr);
763 if (!bh) {
764 err = -EIO;
765 goto out;
766 }
767 lock_buffer(bh);
768 memcpy(bh->b_data+offset, data, tocopy);
769 flush_dcache_page(bh->b_page);
770 set_buffer_uptodate(bh);
771 mark_buffer_dirty(bh);
772 unlock_buffer(bh);
773 brelse(bh);
774 offset = 0;
775 towrite -= tocopy;
776 data += tocopy;
777 blk++;
778 }
779out:
780 if (len == towrite) {
781 inode_unlock(inode);
782 return err;
783 }
784 if (inode->i_size < off+len-towrite)
785 i_size_write(inode, off+len-towrite);
786 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
787 mark_inode_dirty(inode);
788 inode_unlock(inode);
789 return len - towrite;
790}
791
792static struct dquot __rcu **jfs_get_dquots(struct inode *inode)
793{
794 return JFS_IP(inode)->i_dquot;
795}
796
797static int jfs_quota_on(struct super_block *sb, int type, int format_id,
798 const struct path *path)
799{
800 int err;
801 struct inode *inode;
802
803 err = dquot_quota_on(sb, type, format_id, path);
804 if (err)
805 return err;
806
807 inode = d_inode(path->dentry);
808 inode_lock(inode);
809 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
810 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
811 S_NOATIME | S_IMMUTABLE);
812 inode_unlock(inode);
813 mark_inode_dirty(inode);
814
815 return 0;
816}
817
818static int jfs_quota_off(struct super_block *sb, int type)
819{
820 struct inode *inode = sb_dqopt(sb)->files[type];
821 int err;
822
823 if (!inode || !igrab(inode))
824 goto out;
825
826 err = dquot_quota_off(sb, type);
827 if (err)
828 goto out_put;
829
830 inode_lock(inode);
831 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
832 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
833 inode_unlock(inode);
834 mark_inode_dirty(inode);
835out_put:
836 iput(inode);
837 return err;
838out:
839 return dquot_quota_off(sb, type);
840}
841#endif
842
843static const struct super_operations jfs_super_operations = {
844 .alloc_inode = jfs_alloc_inode,
845 .free_inode = jfs_free_inode,
846 .dirty_inode = jfs_dirty_inode,
847 .write_inode = jfs_write_inode,
848 .evict_inode = jfs_evict_inode,
849 .put_super = jfs_put_super,
850 .sync_fs = jfs_sync_fs,
851 .freeze_fs = jfs_freeze,
852 .unfreeze_fs = jfs_unfreeze,
853 .statfs = jfs_statfs,
854 .show_options = jfs_show_options,
855#ifdef CONFIG_QUOTA
856 .quota_read = jfs_quota_read,
857 .quota_write = jfs_quota_write,
858 .get_dquots = jfs_get_dquots,
859#endif
860};
861
862static const struct export_operations jfs_export_operations = {
863 .encode_fh = generic_encode_ino32_fh,
864 .fh_to_dentry = jfs_fh_to_dentry,
865 .fh_to_parent = jfs_fh_to_parent,
866 .get_parent = jfs_get_parent,
867};
868
869static void jfs_init_options(struct fs_context *fc, struct jfs_context *ctx)
870{
871 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
872 struct super_block *sb = fc->root->d_sb;
873
874 /* Copy over current option values and mount flags */
875 ctx->uid = JFS_SBI(sb)->uid;
876 ctx->gid = JFS_SBI(sb)->gid;
877 ctx->umask = JFS_SBI(sb)->umask;
878 ctx->nls_map = (void *)-1;
879 ctx->minblks_trim = JFS_SBI(sb)->minblks_trim;
880 ctx->flag = JFS_SBI(sb)->flag;
881
882 } else {
883 /*
884 * Initialize the mount flag and determine the default
885 * error handler
886 */
887 ctx->flag = JFS_ERR_REMOUNT_RO;
888 ctx->uid = INVALID_UID;
889 ctx->gid = INVALID_GID;
890 ctx->umask = -1;
891 ctx->nls_map = (void *)-1;
892 }
893}
894
895static void jfs_free_fc(struct fs_context *fc)
896{
897 struct jfs_context *ctx = fc->fs_private;
898
899 if (ctx->nls_map != (void *) -1)
900 unload_nls(ctx->nls_map);
901 kfree(ctx);
902}
903
904static const struct fs_context_operations jfs_context_ops = {
905 .parse_param = jfs_parse_param,
906 .get_tree = jfs_get_tree,
907 .reconfigure = jfs_reconfigure,
908 .free = jfs_free_fc,
909};
910
911static int jfs_init_fs_context(struct fs_context *fc)
912{
913 struct jfs_context *ctx;
914
915 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
916 if (!ctx)
917 return -ENOMEM;
918
919 jfs_init_options(fc, ctx);
920
921 fc->fs_private = ctx;
922 fc->ops = &jfs_context_ops;
923
924 return 0;
925}
926
927static struct file_system_type jfs_fs_type = {
928 .owner = THIS_MODULE,
929 .name = "jfs",
930 .kill_sb = kill_block_super,
931 .fs_flags = FS_REQUIRES_DEV,
932 .init_fs_context = jfs_init_fs_context,
933 .parameters = jfs_param_spec,
934};
935MODULE_ALIAS_FS("jfs");
936
937static void init_once(void *foo)
938{
939 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
940
941 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
942 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
943 init_rwsem(&jfs_ip->rdwrlock);
944 mutex_init(&jfs_ip->commit_mutex);
945 init_rwsem(&jfs_ip->xattr_sem);
946 spin_lock_init(&jfs_ip->ag_lock);
947 jfs_ip->active_ag = -1;
948 inode_init_once(&jfs_ip->vfs_inode);
949}
950
951static int __init init_jfs_fs(void)
952{
953 int i;
954 int rc;
955
956 jfs_inode_cachep =
957 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
958 0, SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT,
959 offsetof(struct jfs_inode_info, i_inline_all),
960 sizeof_field(struct jfs_inode_info, i_inline_all),
961 init_once);
962 if (jfs_inode_cachep == NULL)
963 return -ENOMEM;
964
965 /*
966 * Metapage initialization
967 */
968 rc = metapage_init();
969 if (rc) {
970 jfs_err("metapage_init failed w/rc = %d", rc);
971 goto free_slab;
972 }
973
974 /*
975 * Transaction Manager initialization
976 */
977 rc = txInit();
978 if (rc) {
979 jfs_err("txInit failed w/rc = %d", rc);
980 goto free_metapage;
981 }
982
983 /*
984 * I/O completion thread (endio)
985 */
986 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
987 if (IS_ERR(jfsIOthread)) {
988 rc = PTR_ERR(jfsIOthread);
989 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
990 goto end_txmngr;
991 }
992
993 if (commit_threads < 1)
994 commit_threads = num_online_cpus();
995 if (commit_threads > MAX_COMMIT_THREADS)
996 commit_threads = MAX_COMMIT_THREADS;
997
998 for (i = 0; i < commit_threads; i++) {
999 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
1000 "jfsCommit");
1001 if (IS_ERR(jfsCommitThread[i])) {
1002 rc = PTR_ERR(jfsCommitThread[i]);
1003 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1004 commit_threads = i;
1005 goto kill_committask;
1006 }
1007 }
1008
1009 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
1010 if (IS_ERR(jfsSyncThread)) {
1011 rc = PTR_ERR(jfsSyncThread);
1012 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1013 goto kill_committask;
1014 }
1015
1016#ifdef PROC_FS_JFS
1017 jfs_proc_init();
1018#endif
1019
1020 rc = register_filesystem(&jfs_fs_type);
1021 if (!rc)
1022 return 0;
1023
1024#ifdef PROC_FS_JFS
1025 jfs_proc_clean();
1026#endif
1027 kthread_stop(jfsSyncThread);
1028kill_committask:
1029 for (i = 0; i < commit_threads; i++)
1030 kthread_stop(jfsCommitThread[i]);
1031 kthread_stop(jfsIOthread);
1032end_txmngr:
1033 txExit();
1034free_metapage:
1035 metapage_exit();
1036free_slab:
1037 kmem_cache_destroy(jfs_inode_cachep);
1038 return rc;
1039}
1040
1041static void __exit exit_jfs_fs(void)
1042{
1043 int i;
1044
1045 jfs_info("exit_jfs_fs called");
1046
1047 txExit();
1048 metapage_exit();
1049
1050 kthread_stop(jfsIOthread);
1051 for (i = 0; i < commit_threads; i++)
1052 kthread_stop(jfsCommitThread[i]);
1053 kthread_stop(jfsSyncThread);
1054#ifdef PROC_FS_JFS
1055 jfs_proc_clean();
1056#endif
1057 unregister_filesystem(&jfs_fs_type);
1058
1059 /*
1060 * Make sure all delayed rcu free inodes are flushed before we
1061 * destroy cache.
1062 */
1063 rcu_barrier();
1064 kmem_cache_destroy(jfs_inode_cachep);
1065}
1066
1067module_init(init_jfs_fs)
1068module_exit(exit_jfs_fs)
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
49MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
50MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
51MODULE_LICENSE("GPL");
52
53static struct kmem_cache *jfs_inode_cachep;
54
55static const struct super_operations jfs_super_operations;
56static const struct export_operations jfs_export_operations;
57static struct file_system_type jfs_fs_type;
58
59#define MAX_COMMIT_THREADS 64
60static int commit_threads;
61module_param(commit_threads, int, 0);
62MODULE_PARM_DESC(commit_threads, "Number of commit threads");
63
64static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
65struct task_struct *jfsIOthread;
66struct task_struct *jfsSyncThread;
67
68#ifdef CONFIG_JFS_DEBUG
69int jfsloglevel = JFS_LOGLEVEL_WARN;
70module_param(jfsloglevel, int, 0644);
71MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
72#endif
73
74static 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 as read-only",
88 sb->s_id);
89 sb->s_flags |= MS_RDONLY;
90 }
91
92 /* nothing is done for continue beyond marking the superblock dirty */
93}
94
95void jfs_error(struct super_block *sb, const char *fmt, ...)
96{
97 struct va_format vaf;
98 va_list args;
99
100 va_start(args, fmt);
101
102 vaf.fmt = fmt;
103 vaf.va = &args;
104
105 pr_err("ERROR: (device %s): %ps: %pV\n",
106 sb->s_id, __builtin_return_address(0), &vaf);
107
108 va_end(args);
109
110 jfs_handle_error(sb);
111}
112
113static struct inode *jfs_alloc_inode(struct super_block *sb)
114{
115 struct jfs_inode_info *jfs_inode;
116
117 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
118 if (!jfs_inode)
119 return NULL;
120#ifdef CONFIG_QUOTA
121 memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot));
122#endif
123 return &jfs_inode->vfs_inode;
124}
125
126static void jfs_i_callback(struct rcu_head *head)
127{
128 struct inode *inode = container_of(head, struct inode, i_rcu);
129 struct jfs_inode_info *ji = JFS_IP(inode);
130 kmem_cache_free(jfs_inode_cachep, ji);
131}
132
133static void jfs_destroy_inode(struct inode *inode)
134{
135 struct jfs_inode_info *ji = JFS_IP(inode);
136
137 BUG_ON(!list_empty(&ji->anon_inode_list));
138
139 spin_lock_irq(&ji->ag_lock);
140 if (ji->active_ag != -1) {
141 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
142 atomic_dec(&bmap->db_active[ji->active_ag]);
143 ji->active_ag = -1;
144 }
145 spin_unlock_irq(&ji->ag_lock);
146 call_rcu(&inode->i_rcu, jfs_i_callback);
147}
148
149static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
150{
151 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
152 s64 maxinodes;
153 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
154
155 jfs_info("In jfs_statfs");
156 buf->f_type = JFS_SUPER_MAGIC;
157 buf->f_bsize = sbi->bsize;
158 buf->f_blocks = sbi->bmap->db_mapsize;
159 buf->f_bfree = sbi->bmap->db_nfree;
160 buf->f_bavail = sbi->bmap->db_nfree;
161 /*
162 * If we really return the number of allocated & free inodes, some
163 * applications will fail because they won't see enough free inodes.
164 * We'll try to calculate some guess as to how many inodes we can
165 * really allocate
166 *
167 * buf->f_files = atomic_read(&imap->im_numinos);
168 * buf->f_ffree = atomic_read(&imap->im_numfree);
169 */
170 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
171 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
172 << L2INOSPEREXT), (s64) 0xffffffffLL);
173 buf->f_files = maxinodes;
174 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
175 atomic_read(&imap->im_numfree));
176 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
177 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
178 sizeof(sbi->uuid)/2);
179
180 buf->f_namelen = JFS_NAME_MAX;
181 return 0;
182}
183
184static void jfs_put_super(struct super_block *sb)
185{
186 struct jfs_sb_info *sbi = JFS_SBI(sb);
187 int rc;
188
189 jfs_info("In jfs_put_super");
190
191 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
192
193 rc = jfs_umount(sb);
194 if (rc)
195 jfs_err("jfs_umount failed with return code %d", rc);
196
197 unload_nls(sbi->nls_tab);
198
199 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
200 iput(sbi->direct_inode);
201
202 kfree(sbi);
203}
204
205enum {
206 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
207 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
208 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
209 Opt_discard, Opt_nodiscard, Opt_discard_minblk
210};
211
212static const match_table_t tokens = {
213 {Opt_integrity, "integrity"},
214 {Opt_nointegrity, "nointegrity"},
215 {Opt_iocharset, "iocharset=%s"},
216 {Opt_resize, "resize=%u"},
217 {Opt_resize_nosize, "resize"},
218 {Opt_errors, "errors=%s"},
219 {Opt_ignore, "noquota"},
220 {Opt_ignore, "quota"},
221 {Opt_usrquota, "usrquota"},
222 {Opt_grpquota, "grpquota"},
223 {Opt_uid, "uid=%u"},
224 {Opt_gid, "gid=%u"},
225 {Opt_umask, "umask=%u"},
226 {Opt_discard, "discard"},
227 {Opt_nodiscard, "nodiscard"},
228 {Opt_discard_minblk, "discard=%u"},
229 {Opt_err, NULL}
230};
231
232static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
233 int *flag)
234{
235 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
236 char *p;
237 struct jfs_sb_info *sbi = JFS_SBI(sb);
238
239 *newLVSize = 0;
240
241 if (!options)
242 return 1;
243
244 while ((p = strsep(&options, ",")) != NULL) {
245 substring_t args[MAX_OPT_ARGS];
246 int token;
247 if (!*p)
248 continue;
249
250 token = match_token(p, tokens, args);
251 switch (token) {
252 case Opt_integrity:
253 *flag &= ~JFS_NOINTEGRITY;
254 break;
255 case Opt_nointegrity:
256 *flag |= JFS_NOINTEGRITY;
257 break;
258 case Opt_ignore:
259 /* Silently ignore the quota options */
260 /* Don't do anything ;-) */
261 break;
262 case Opt_iocharset:
263 if (nls_map && nls_map != (void *) -1)
264 unload_nls(nls_map);
265 if (!strcmp(args[0].from, "none"))
266 nls_map = NULL;
267 else {
268 nls_map = load_nls(args[0].from);
269 if (!nls_map) {
270 pr_err("JFS: charset not found\n");
271 goto cleanup;
272 }
273 }
274 break;
275 case Opt_resize:
276 {
277 char *resize = args[0].from;
278 int rc = kstrtoll(resize, 0, newLVSize);
279
280 if (rc)
281 goto cleanup;
282 break;
283 }
284 case Opt_resize_nosize:
285 {
286 *newLVSize = sb->s_bdev->bd_inode->i_size >>
287 sb->s_blocksize_bits;
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 {
376 struct request_queue *q = bdev_get_queue(sb->s_bdev);
377 /* if set to 1, even copying files will cause
378 * trimming :O
379 * -> user has more control over the online trimming
380 */
381 sbi->minblks_trim = 64;
382 if (blk_queue_discard(q))
383 *flag |= JFS_DISCARD;
384 else
385 pr_err("JFS: discard option not supported on device\n");
386 break;
387 }
388
389 case Opt_nodiscard:
390 *flag &= ~JFS_DISCARD;
391 break;
392
393 case Opt_discard_minblk:
394 {
395 struct request_queue *q = bdev_get_queue(sb->s_bdev);
396 char *minblks_trim = args[0].from;
397 int rc;
398 if (blk_queue_discard(q)) {
399 *flag |= JFS_DISCARD;
400 rc = kstrtouint(minblks_trim, 0,
401 &sbi->minblks_trim);
402 if (rc)
403 goto cleanup;
404 } else
405 pr_err("JFS: discard option not supported on device\n");
406 break;
407 }
408
409 default:
410 printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
411 p);
412 goto cleanup;
413 }
414 }
415
416 if (nls_map != (void *) -1) {
417 /* Discard old (if remount) */
418 unload_nls(sbi->nls_tab);
419 sbi->nls_tab = nls_map;
420 }
421 return 1;
422
423cleanup:
424 if (nls_map && nls_map != (void *) -1)
425 unload_nls(nls_map);
426 return 0;
427}
428
429static int jfs_remount(struct super_block *sb, int *flags, char *data)
430{
431 s64 newLVSize = 0;
432 int rc = 0;
433 int flag = JFS_SBI(sb)->flag;
434 int ret;
435
436 sync_filesystem(sb);
437 if (!parse_options(data, sb, &newLVSize, &flag))
438 return -EINVAL;
439
440 if (newLVSize) {
441 if (sb->s_flags & MS_RDONLY) {
442 pr_err("JFS: resize requires volume to be mounted read-write\n");
443 return -EROFS;
444 }
445 rc = jfs_extendfs(sb, newLVSize, 0);
446 if (rc)
447 return rc;
448 }
449
450 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
451 /*
452 * Invalidate any previously read metadata. fsck may have
453 * changed the on-disk data since we mounted r/o
454 */
455 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
456
457 JFS_SBI(sb)->flag = flag;
458 ret = jfs_mount_rw(sb, 1);
459
460 /* mark the fs r/w for quota activity */
461 sb->s_flags &= ~MS_RDONLY;
462
463 dquot_resume(sb, -1);
464 return ret;
465 }
466 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
467 rc = dquot_suspend(sb, -1);
468 if (rc < 0)
469 return rc;
470 rc = jfs_umount_rw(sb);
471 JFS_SBI(sb)->flag = flag;
472 return rc;
473 }
474 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
475 if (!(sb->s_flags & MS_RDONLY)) {
476 rc = jfs_umount_rw(sb);
477 if (rc)
478 return rc;
479
480 JFS_SBI(sb)->flag = flag;
481 ret = jfs_mount_rw(sb, 1);
482 return ret;
483 }
484 JFS_SBI(sb)->flag = flag;
485
486 return 0;
487}
488
489static int jfs_fill_super(struct super_block *sb, void *data, int silent)
490{
491 struct jfs_sb_info *sbi;
492 struct inode *inode;
493 int rc;
494 s64 newLVSize = 0;
495 int flag, ret = -EINVAL;
496
497 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
498
499 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
500 if (!sbi)
501 return -ENOMEM;
502
503 sb->s_fs_info = sbi;
504 sb->s_max_links = JFS_LINK_MAX;
505 sbi->sb = sb;
506 sbi->uid = INVALID_UID;
507 sbi->gid = INVALID_GID;
508 sbi->umask = -1;
509
510 /* initialize the mount flag and determine the default error handler */
511 flag = JFS_ERR_REMOUNT_RO;
512
513 if (!parse_options((char *) data, sb, &newLVSize, &flag))
514 goto out_kfree;
515 sbi->flag = flag;
516
517#ifdef CONFIG_JFS_POSIX_ACL
518 sb->s_flags |= MS_POSIXACL;
519#endif
520
521 if (newLVSize) {
522 pr_err("resize option for remount only\n");
523 goto out_kfree;
524 }
525
526 /*
527 * Initialize blocksize to 4K.
528 */
529 sb_set_blocksize(sb, PSIZE);
530
531 /*
532 * Set method vectors.
533 */
534 sb->s_op = &jfs_super_operations;
535 sb->s_export_op = &jfs_export_operations;
536 sb->s_xattr = jfs_xattr_handlers;
537#ifdef CONFIG_QUOTA
538 sb->dq_op = &dquot_operations;
539 sb->s_qcop = &dquot_quotactl_ops;
540 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
541#endif
542
543 /*
544 * Initialize direct-mapping inode/address-space
545 */
546 inode = new_inode(sb);
547 if (inode == NULL) {
548 ret = -ENOMEM;
549 goto out_unload;
550 }
551 inode->i_ino = 0;
552 inode->i_size = sb->s_bdev->bd_inode->i_size;
553 inode->i_mapping->a_ops = &jfs_metapage_aops;
554 hlist_add_fake(&inode->i_hash);
555 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
556
557 sbi->direct_inode = inode;
558
559 rc = jfs_mount(sb);
560 if (rc) {
561 if (!silent)
562 jfs_err("jfs_mount failed w/return code = %d", rc);
563 goto out_mount_failed;
564 }
565 if (sb->s_flags & MS_RDONLY)
566 sbi->log = NULL;
567 else {
568 rc = jfs_mount_rw(sb, 0);
569 if (rc) {
570 if (!silent) {
571 jfs_err("jfs_mount_rw failed, return code = %d",
572 rc);
573 }
574 goto out_no_rw;
575 }
576 }
577
578 sb->s_magic = JFS_SUPER_MAGIC;
579
580 if (sbi->mntflag & JFS_OS2)
581 sb->s_d_op = &jfs_ci_dentry_operations;
582
583 inode = jfs_iget(sb, ROOT_I);
584 if (IS_ERR(inode)) {
585 ret = PTR_ERR(inode);
586 goto out_no_rw;
587 }
588 sb->s_root = d_make_root(inode);
589 if (!sb->s_root)
590 goto out_no_root;
591
592 /* logical blocks are represented by 40 bits in pxd_t, etc. */
593 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
594#if BITS_PER_LONG == 32
595 /*
596 * Page cache is indexed by long.
597 * I would use MAX_LFS_FILESIZE, but it's only half as big
598 */
599 sb->s_maxbytes = min(((u64) PAGE_SIZE << 32) - 1,
600 (u64)sb->s_maxbytes);
601#endif
602 sb->s_time_gran = 1;
603 return 0;
604
605out_no_root:
606 jfs_err("jfs_read_super: get root dentry failed");
607
608out_no_rw:
609 rc = jfs_umount(sb);
610 if (rc)
611 jfs_err("jfs_umount failed with return code %d", rc);
612out_mount_failed:
613 filemap_write_and_wait(sbi->direct_inode->i_mapping);
614 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
615 make_bad_inode(sbi->direct_inode);
616 iput(sbi->direct_inode);
617 sbi->direct_inode = NULL;
618out_unload:
619 unload_nls(sbi->nls_tab);
620out_kfree:
621 kfree(sbi);
622 return ret;
623}
624
625static int jfs_freeze(struct super_block *sb)
626{
627 struct jfs_sb_info *sbi = JFS_SBI(sb);
628 struct jfs_log *log = sbi->log;
629 int rc = 0;
630
631 if (!(sb->s_flags & MS_RDONLY)) {
632 txQuiesce(sb);
633 rc = lmLogShutdown(log);
634 if (rc) {
635 jfs_error(sb, "lmLogShutdown failed\n");
636
637 /* let operations fail rather than hang */
638 txResume(sb);
639
640 return rc;
641 }
642 rc = updateSuper(sb, FM_CLEAN);
643 if (rc) {
644 jfs_err("jfs_freeze: updateSuper failed");
645 /*
646 * Don't fail here. Everything succeeded except
647 * marking the superblock clean, so there's really
648 * no harm in leaving it frozen for now.
649 */
650 }
651 }
652 return 0;
653}
654
655static int jfs_unfreeze(struct super_block *sb)
656{
657 struct jfs_sb_info *sbi = JFS_SBI(sb);
658 struct jfs_log *log = sbi->log;
659 int rc = 0;
660
661 if (!(sb->s_flags & MS_RDONLY)) {
662 rc = updateSuper(sb, FM_MOUNT);
663 if (rc) {
664 jfs_error(sb, "updateSuper failed\n");
665 goto out;
666 }
667 rc = lmLogInit(log);
668 if (rc)
669 jfs_error(sb, "lmLogInit failed\n");
670out:
671 txResume(sb);
672 }
673 return rc;
674}
675
676static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
677 int flags, const char *dev_name, void *data)
678{
679 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
680}
681
682static int jfs_sync_fs(struct super_block *sb, int wait)
683{
684 struct jfs_log *log = JFS_SBI(sb)->log;
685
686 /* log == NULL indicates read-only mount */
687 if (log) {
688 /*
689 * Write quota structures to quota file, sync_blockdev() will
690 * write them to disk later
691 */
692 dquot_writeback_dquots(sb, -1);
693 jfs_flush_journal(log, wait);
694 jfs_syncpt(log, 0);
695 }
696
697 return 0;
698}
699
700static int jfs_show_options(struct seq_file *seq, struct dentry *root)
701{
702 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
703
704 if (uid_valid(sbi->uid))
705 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
706 if (gid_valid(sbi->gid))
707 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
708 if (sbi->umask != -1)
709 seq_printf(seq, ",umask=%03o", sbi->umask);
710 if (sbi->flag & JFS_NOINTEGRITY)
711 seq_puts(seq, ",nointegrity");
712 if (sbi->flag & JFS_DISCARD)
713 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
714 if (sbi->nls_tab)
715 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
716 if (sbi->flag & JFS_ERR_CONTINUE)
717 seq_printf(seq, ",errors=continue");
718 if (sbi->flag & JFS_ERR_PANIC)
719 seq_printf(seq, ",errors=panic");
720
721#ifdef CONFIG_QUOTA
722 if (sbi->flag & JFS_USRQUOTA)
723 seq_puts(seq, ",usrquota");
724
725 if (sbi->flag & JFS_GRPQUOTA)
726 seq_puts(seq, ",grpquota");
727#endif
728
729 return 0;
730}
731
732#ifdef CONFIG_QUOTA
733
734/* Read data from quotafile - avoid pagecache and such because we cannot afford
735 * acquiring the locks... As quota files are never truncated and quota code
736 * itself serializes the operations (and no one else should touch the files)
737 * we don't have to be afraid of races */
738static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
739 size_t len, loff_t off)
740{
741 struct inode *inode = sb_dqopt(sb)->files[type];
742 sector_t blk = off >> sb->s_blocksize_bits;
743 int err = 0;
744 int offset = off & (sb->s_blocksize - 1);
745 int tocopy;
746 size_t toread;
747 struct buffer_head tmp_bh;
748 struct buffer_head *bh;
749 loff_t i_size = i_size_read(inode);
750
751 if (off > i_size)
752 return 0;
753 if (off+len > i_size)
754 len = i_size-off;
755 toread = len;
756 while (toread > 0) {
757 tocopy = sb->s_blocksize - offset < toread ?
758 sb->s_blocksize - offset : toread;
759
760 tmp_bh.b_state = 0;
761 tmp_bh.b_size = 1 << inode->i_blkbits;
762 err = jfs_get_block(inode, blk, &tmp_bh, 0);
763 if (err)
764 return err;
765 if (!buffer_mapped(&tmp_bh)) /* A hole? */
766 memset(data, 0, tocopy);
767 else {
768 bh = sb_bread(sb, tmp_bh.b_blocknr);
769 if (!bh)
770 return -EIO;
771 memcpy(data, bh->b_data+offset, tocopy);
772 brelse(bh);
773 }
774 offset = 0;
775 toread -= tocopy;
776 data += tocopy;
777 blk++;
778 }
779 return len;
780}
781
782/* Write to quotafile */
783static ssize_t jfs_quota_write(struct super_block *sb, int type,
784 const char *data, size_t len, loff_t off)
785{
786 struct inode *inode = sb_dqopt(sb)->files[type];
787 sector_t blk = off >> sb->s_blocksize_bits;
788 int err = 0;
789 int offset = off & (sb->s_blocksize - 1);
790 int tocopy;
791 size_t towrite = len;
792 struct buffer_head tmp_bh;
793 struct buffer_head *bh;
794
795 inode_lock(inode);
796 while (towrite > 0) {
797 tocopy = sb->s_blocksize - offset < towrite ?
798 sb->s_blocksize - offset : towrite;
799
800 tmp_bh.b_state = 0;
801 tmp_bh.b_size = 1 << inode->i_blkbits;
802 err = jfs_get_block(inode, blk, &tmp_bh, 1);
803 if (err)
804 goto out;
805 if (offset || tocopy != sb->s_blocksize)
806 bh = sb_bread(sb, tmp_bh.b_blocknr);
807 else
808 bh = sb_getblk(sb, tmp_bh.b_blocknr);
809 if (!bh) {
810 err = -EIO;
811 goto out;
812 }
813 lock_buffer(bh);
814 memcpy(bh->b_data+offset, data, tocopy);
815 flush_dcache_page(bh->b_page);
816 set_buffer_uptodate(bh);
817 mark_buffer_dirty(bh);
818 unlock_buffer(bh);
819 brelse(bh);
820 offset = 0;
821 towrite -= tocopy;
822 data += tocopy;
823 blk++;
824 }
825out:
826 if (len == towrite) {
827 inode_unlock(inode);
828 return err;
829 }
830 if (inode->i_size < off+len-towrite)
831 i_size_write(inode, off+len-towrite);
832 inode->i_version++;
833 inode->i_mtime = inode->i_ctime = current_time(inode);
834 mark_inode_dirty(inode);
835 inode_unlock(inode);
836 return len - towrite;
837}
838
839static struct dquot **jfs_get_dquots(struct inode *inode)
840{
841 return JFS_IP(inode)->i_dquot;
842}
843#endif
844
845static const struct super_operations jfs_super_operations = {
846 .alloc_inode = jfs_alloc_inode,
847 .destroy_inode = jfs_destroy_inode,
848 .dirty_inode = jfs_dirty_inode,
849 .write_inode = jfs_write_inode,
850 .evict_inode = jfs_evict_inode,
851 .put_super = jfs_put_super,
852 .sync_fs = jfs_sync_fs,
853 .freeze_fs = jfs_freeze,
854 .unfreeze_fs = jfs_unfreeze,
855 .statfs = jfs_statfs,
856 .remount_fs = jfs_remount,
857 .show_options = jfs_show_options,
858#ifdef CONFIG_QUOTA
859 .quota_read = jfs_quota_read,
860 .quota_write = jfs_quota_write,
861 .get_dquots = jfs_get_dquots,
862#endif
863};
864
865static const struct export_operations jfs_export_operations = {
866 .fh_to_dentry = jfs_fh_to_dentry,
867 .fh_to_parent = jfs_fh_to_parent,
868 .get_parent = jfs_get_parent,
869};
870
871static struct file_system_type jfs_fs_type = {
872 .owner = THIS_MODULE,
873 .name = "jfs",
874 .mount = jfs_do_mount,
875 .kill_sb = kill_block_super,
876 .fs_flags = FS_REQUIRES_DEV,
877};
878MODULE_ALIAS_FS("jfs");
879
880static void init_once(void *foo)
881{
882 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
883
884 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
885 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
886 init_rwsem(&jfs_ip->rdwrlock);
887 mutex_init(&jfs_ip->commit_mutex);
888 init_rwsem(&jfs_ip->xattr_sem);
889 spin_lock_init(&jfs_ip->ag_lock);
890 jfs_ip->active_ag = -1;
891 inode_init_once(&jfs_ip->vfs_inode);
892}
893
894static int __init init_jfs_fs(void)
895{
896 int i;
897 int rc;
898
899 jfs_inode_cachep =
900 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
901 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
902 init_once);
903 if (jfs_inode_cachep == NULL)
904 return -ENOMEM;
905
906 /*
907 * Metapage initialization
908 */
909 rc = metapage_init();
910 if (rc) {
911 jfs_err("metapage_init failed w/rc = %d", rc);
912 goto free_slab;
913 }
914
915 /*
916 * Transaction Manager initialization
917 */
918 rc = txInit();
919 if (rc) {
920 jfs_err("txInit failed w/rc = %d", rc);
921 goto free_metapage;
922 }
923
924 /*
925 * I/O completion thread (endio)
926 */
927 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
928 if (IS_ERR(jfsIOthread)) {
929 rc = PTR_ERR(jfsIOthread);
930 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
931 goto end_txmngr;
932 }
933
934 if (commit_threads < 1)
935 commit_threads = num_online_cpus();
936 if (commit_threads > MAX_COMMIT_THREADS)
937 commit_threads = MAX_COMMIT_THREADS;
938
939 for (i = 0; i < commit_threads; i++) {
940 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
941 "jfsCommit");
942 if (IS_ERR(jfsCommitThread[i])) {
943 rc = PTR_ERR(jfsCommitThread[i]);
944 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
945 commit_threads = i;
946 goto kill_committask;
947 }
948 }
949
950 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
951 if (IS_ERR(jfsSyncThread)) {
952 rc = PTR_ERR(jfsSyncThread);
953 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
954 goto kill_committask;
955 }
956
957#ifdef PROC_FS_JFS
958 jfs_proc_init();
959#endif
960
961 rc = register_filesystem(&jfs_fs_type);
962 if (!rc)
963 return 0;
964
965#ifdef PROC_FS_JFS
966 jfs_proc_clean();
967#endif
968 kthread_stop(jfsSyncThread);
969kill_committask:
970 for (i = 0; i < commit_threads; i++)
971 kthread_stop(jfsCommitThread[i]);
972 kthread_stop(jfsIOthread);
973end_txmngr:
974 txExit();
975free_metapage:
976 metapage_exit();
977free_slab:
978 kmem_cache_destroy(jfs_inode_cachep);
979 return rc;
980}
981
982static void __exit exit_jfs_fs(void)
983{
984 int i;
985
986 jfs_info("exit_jfs_fs called");
987
988 txExit();
989 metapage_exit();
990
991 kthread_stop(jfsIOthread);
992 for (i = 0; i < commit_threads; i++)
993 kthread_stop(jfsCommitThread[i]);
994 kthread_stop(jfsSyncThread);
995#ifdef PROC_FS_JFS
996 jfs_proc_clean();
997#endif
998 unregister_filesystem(&jfs_fs_type);
999
1000 /*
1001 * Make sure all delayed rcu free inodes are flushed before we
1002 * destroy cache.
1003 */
1004 rcu_barrier();
1005 kmem_cache_destroy(jfs_inode_cachep);
1006}
1007
1008module_init(init_jfs_fs)
1009module_exit(exit_jfs_fs)