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(fmt: "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(s: jfs_inode_cachep, objp: JFS_IP(inode));
117}
118
119static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
120{
121 struct jfs_sb_info *sbi = JFS_SBI(sb: dentry->d_sb);
122 s64 maxinodes;
123 struct inomap *imap = JFS_IP(inode: 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(v: &imap->im_numinos) -
145 atomic_read(v: &imap->im_numfree));
146 buf->f_fsid.val[0] = crc32_le(crc: 0, p: (char *)&sbi->uuid,
147 len: sizeof(sbi->uuid)/2);
148 buf->f_fsid.val[1] = crc32_le(crc: 0,
149 p: (char *)&sbi->uuid + sizeof(sbi->uuid)/2,
150 len: 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(mapping: sbi->direct_inode->i_mapping, lstart: 0);
201 iput(sbi->direct_inode);
202
203 kfree(objp: 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, desc: jfs_param_spec, param, result: &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(charset: 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(mapping: JFS_SBI(sb)->direct_inode->i_mapping, lstart: 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, type: -1);
415 return ret;
416 }
417 if (!sb_rdonly(sb) && readonly) {
418 rc = dquot_suspend(sb, type: -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(bdev: 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(bdev: sb->s_bdev);
517 inode->i_mapping->a_ops = &jfs_metapage_aops;
518 inode_fake_hash(inode);
519 mapping_set_gfp_mask(m: 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 set_default_d_op(sb, &jfs_ci_dentry_operations);
546
547 inode = jfs_iget(sb, ROOT_I);
548 if (IS_ERR(ptr: inode)) {
549 ret = PTR_ERR(ptr: 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(mapping: sbi->direct_inode->i_mapping);
572 truncate_inode_pages(mapping: sbi->direct_inode->i_mapping, lstart: 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(objp: 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, fmt: "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, fmt: "updateSuper failed\n");
622 goto out;
623 }
624 rc = lmLogInit(log);
625 if (rc)
626 jfs_error(sb, fmt: "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, fill_super: 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, type: -1);
649 jfs_flush_journal(log, wait);
650 jfs_syncpt(log, hard_sync: 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(sb: root->d_sb);
659
660 if (uid_valid(uid: sbi->uid))
661 seq_printf(m: seq, fmt: ",uid=%d", from_kuid(to: &init_user_ns, uid: sbi->uid));
662 if (gid_valid(gid: sbi->gid))
663 seq_printf(m: seq, fmt: ",gid=%d", from_kgid(to: &init_user_ns, gid: sbi->gid));
664 if (sbi->umask != -1)
665 seq_printf(m: seq, fmt: ",umask=%03o", sbi->umask);
666 if (sbi->flag & JFS_NOINTEGRITY)
667 seq_puts(m: seq, s: ",nointegrity");
668 if (sbi->flag & JFS_DISCARD)
669 seq_printf(m: seq, fmt: ",discard=%u", sbi->minblks_trim);
670 if (sbi->nls_tab)
671 seq_printf(m: seq, fmt: ",iocharset=%s", sbi->nls_tab->charset);
672 if (sbi->flag & JFS_ERR_CONTINUE)
673 seq_printf(m: seq, fmt: ",errors=continue");
674 if (sbi->flag & JFS_ERR_PANIC)
675 seq_printf(m: seq, fmt: ",errors=panic");
676
677#ifdef CONFIG_QUOTA
678 if (sbi->flag & JFS_USRQUOTA)
679 seq_puts(m: seq, s: ",usrquota");
680
681 if (sbi->flag & JFS_GRPQUOTA)
682 seq_puts(m: seq, s: ",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(node: inode);
717 err = jfs_get_block(inode, blk, &tmp_bh, 0);
718 if (err)
719 return err;
720 if (!buffer_mapped(bh: &tmp_bh)) /* A hole? */
721 memset(data, 0, tocopy);
722 else {
723 bh = sb_bread(sb, block: 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(node: 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, block: tmp_bh.b_blocknr);
761 else
762 bh = sb_getblk(sb, block: 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_folio(folio: bh->b_folio);
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, i_size: off+len-towrite);
786 inode_set_mtime_to_ts(inode, ts: 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(dentry: 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, flags: 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(objp: 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(list: &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(name: "jfs_ip", size: sizeof(struct jfs_inode_info),
958 align: 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 ctor: 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(ptr: jfsIOthread)) {
988 rc = PTR_ERR(ptr: 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(ptr: jfsCommitThread[i])) {
1002 rc = PTR_ERR(ptr: 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(ptr: jfsSyncThread)) {
1011 rc = PTR_ERR(ptr: 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(k: jfsSyncThread);
1028kill_committask:
1029 for (i = 0; i < commit_threads; i++)
1030 kthread_stop(k: jfsCommitThread[i]);
1031 kthread_stop(k: jfsIOthread);
1032end_txmngr:
1033 txExit();
1034free_metapage:
1035 metapage_exit();
1036free_slab:
1037 kmem_cache_destroy(s: 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(k: jfsIOthread);
1051 for (i = 0; i < commit_threads; i++)
1052 kthread_stop(k: jfsCommitThread[i]);
1053 kthread_stop(k: 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(s: jfs_inode_cachep);
1065}
1066
1067module_init(init_jfs_fs)
1068module_exit(exit_jfs_fs)
1069

source code of linux/fs/jfs/super.c