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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[linux-stable.git] / fs / jfs / super.c
blob223d9ac59839d54282f39974e021a206bcc9c315
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
37 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
38 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
39 MODULE_LICENSE("GPL");
40
41 static struct kmem_cache *jfs_inode_cachep;
42
43 static const struct super_operations jfs_super_operations;
44 static const struct export_operations jfs_export_operations;
45 static struct file_system_type jfs_fs_type;
46
47 #define MAX_COMMIT_THREADS 64
48 static int commit_threads;
49 module_param(commit_threads, int, 0);
50 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
51
52 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
53 struct task_struct *jfsIOthread;
54 struct task_struct *jfsSyncThread;
55
56 #ifdef CONFIG_JFS_DEBUG
57 int jfsloglevel = JFS_LOGLEVEL_WARN;
58 module_param(jfsloglevel, int, 0644);
59 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
60 #endif
61
62 static void jfs_handle_error(struct super_block *sb)
63 {
64 struct jfs_sb_info *sbi = JFS_SBI(sb);
65
66 if (sb_rdonly(sb))
67 return;
68
69 updateSuper(sb, FM_DIRTY);
70
71 if (sbi->flag & JFS_ERR_PANIC)
72 panic("JFS (device %s): panic forced after error\n",
73 sb->s_id);
74 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
75 jfs_err("ERROR: (device %s): remounting filesystem as read-only",
76 sb->s_id);
77 sb->s_flags |= SB_RDONLY;
78 }
79
80 /* nothing is done for continue beyond marking the superblock dirty */
81 }
82
83 void jfs_error(struct super_block *sb, const char *fmt, ...)
84 {
85 struct va_format vaf;
86 va_list args;
87
88 va_start(args, fmt);
89
90 vaf.fmt = fmt;
91 vaf.va = &args;
92
93 pr_err("ERROR: (device %s): %ps: %pV\n",
94 sb->s_id, __builtin_return_address(0), &vaf);
95
96 va_end(args);
97
98 jfs_handle_error(sb);
99 }
100
101 static struct inode *jfs_alloc_inode(struct super_block *sb)
102 {
103 struct jfs_inode_info *jfs_inode;
104
105 jfs_inode = alloc_inode_sb(sb, jfs_inode_cachep, GFP_NOFS);
106 if (!jfs_inode)
107 return NULL;
108 #ifdef CONFIG_QUOTA
109 memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot));
110 #endif
111 return &jfs_inode->vfs_inode;
112 }
113
114 static void jfs_free_inode(struct inode *inode)
115 {
116 kmem_cache_free(jfs_inode_cachep, JFS_IP(inode));
117 }
118
119 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
120 {
121 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
122 s64 maxinodes;
123 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
124
125 jfs_info("In jfs_statfs");
126 buf->f_type = JFS_SUPER_MAGIC;
127 buf->f_bsize = sbi->bsize;
128 buf->f_blocks = sbi->bmap->db_mapsize;
129 buf->f_bfree = sbi->bmap->db_nfree;
130 buf->f_bavail = sbi->bmap->db_nfree;
131 /*
132 * If we really return the number of allocated & free inodes, some
133 * applications will fail because they won't see enough free inodes.
134 * We'll try to calculate some guess as to how many inodes we can
135 * really allocate
136 *
137 * buf->f_files = atomic_read(&imap->im_numinos);
138 * buf->f_ffree = atomic_read(&imap->im_numfree);
139 */
140 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
141 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
142 << L2INOSPEREXT), (s64) 0xffffffffLL);
143 buf->f_files = maxinodes;
144 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
145 atomic_read(&imap->im_numfree));
146 buf->f_fsid.val[0] = crc32_le(0, (char *)&sbi->uuid,
147 sizeof(sbi->uuid)/2);
148 buf->f_fsid.val[1] = crc32_le(0,
149 (char *)&sbi->uuid + sizeof(sbi->uuid)/2,
150 sizeof(sbi->uuid)/2);
151
152 buf->f_namelen = JFS_NAME_MAX;
153 return 0;
154 }
155
156 #ifdef CONFIG_QUOTA
157 static int jfs_quota_off(struct super_block *sb, int type);
158 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
159 const struct path *path);
160
161 static void jfs_quota_off_umount(struct super_block *sb)
162 {
163 int type;
164
165 for (type = 0; type < MAXQUOTAS; type++)
166 jfs_quota_off(sb, type);
167 }
168
169 static const struct quotactl_ops jfs_quotactl_ops = {
170 .quota_on = jfs_quota_on,
171 .quota_off = jfs_quota_off,
172 .quota_sync = dquot_quota_sync,
173 .get_state = dquot_get_state,
174 .set_info = dquot_set_dqinfo,
175 .get_dqblk = dquot_get_dqblk,
176 .set_dqblk = dquot_set_dqblk,
177 .get_nextdqblk = dquot_get_next_dqblk,
178 };
179 #else
180 static inline void jfs_quota_off_umount(struct super_block *sb)
181 {
182 }
183 #endif
184
185 static void jfs_put_super(struct super_block *sb)
186 {
187 struct jfs_sb_info *sbi = JFS_SBI(sb);
188 int rc;
189
190 jfs_info("In jfs_put_super");
191
192 jfs_quota_off_umount(sb);
193
194 rc = jfs_umount(sb);
195 if (rc)
196 jfs_err("jfs_umount failed with return code %d", rc);
197
198 unload_nls(sbi->nls_tab);
199
200 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
201 iput(sbi->direct_inode);
202
203 kfree(sbi);
204 }
205
206 enum {
207 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
208 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
209 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
210 Opt_discard, Opt_nodiscard, Opt_discard_minblk
211 };
212
213 static const 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
220 static 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
239 struct 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
250 static 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
361 static 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
441 static 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
563 out_no_root:
564 jfs_err("jfs_read_super: get root dentry failed");
565
566 out_no_rw:
567 rc = jfs_umount(sb);
568 if (rc)
569 jfs_err("jfs_umount failed with return code %d", rc);
570 out_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;
576 out_unload:
577 unload_nls(sbi->nls_tab);
578 kfree(sbi);
579 return ret;
580 }
581
582 static 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
612 static 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");
627 out:
628 txResume(sb);
629 }
630 return rc;
631 }
632
633 static int jfs_get_tree(struct fs_context *fc)
634 {
635 return get_tree_bdev(fc, jfs_fill_super);
636 }
637
638 static 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
656 static 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 */
694 static 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 */
738 static 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 }
779 out:
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
792 static struct dquot __rcu **jfs_get_dquots(struct inode *inode)
793 {
794 return JFS_IP(inode)->i_dquot;
795 }
796
797 static 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
818 static 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);
835 out_put:
836 iput(inode);
837 return err;
838 out:
839 return dquot_quota_off(sb, type);
840 }
841 #endif
842
843 static 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
862 static 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
869 static 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
895 static 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
904 static 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
911 static 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
927 static 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 };
935 MODULE_ALIAS_FS("jfs");
936
937 static 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
951 static 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);
1028 kill_committask:
1029 for (i = 0; i < commit_threads; i++)
1030 kthread_stop(jfsCommitThread[i]);
1031 kthread_stop(jfsIOthread);
1032 end_txmngr:
1033 txExit();
1034 free_metapage:
1035 metapage_exit();
1036 free_slab:
1037 kmem_cache_destroy(jfs_inode_cachep);
1038 return rc;
1039 }
1040
1041 static 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
1067 module_init(init_jfs_fs)
1068 module_exit(exit_jfs_fs)
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