1 /*
2 * Copyright (C) International Business Machines Corp., 2000-2005
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/config.h>
21 #include <linux/fs.h>
22 #include <linux/module.h>
23 #include <linux/blkdev.h>
24 #include <linux/completion.h>
25 #include <asm/uaccess.h>
26 #include "jfs_incore.h"
27 #include "jfs_filsys.h"
28 #include "jfs_metapage.h"
29 #include "jfs_superblock.h"
30 #include "jfs_dmap.h"
31 #include "jfs_imap.h"
32 #include "jfs_debug.h"
33
34 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
35 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
36 MODULE_LICENSE("GPL");
37
38 static struct super_operations jfs_super_operations;
39 static struct file_system_type jfs_fs_type;
40
41 int jfs_stop_threads;
42 static pid_t jfsIOthread;
43 static pid_t jfsCommitThread;
44 static pid_t jfsSyncThread;
45 DECLARE_COMPLETION(jfsIOwait);
46
47 #ifdef CONFIG_JFS_DEBUG
48 int jfsloglevel = JFS_LOGLEVEL_WARN;
49 MODULE_PARM(jfsloglevel, "i");
50 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
51 #endif
52
53 /*
54 * External declarations
55 */
56 extern int jfs_mount(struct super_block *);
57 extern int jfs_mount_rw(struct super_block *, int);
58 extern int jfs_umount(struct super_block *);
59 extern int jfs_umount_rw(struct super_block *);
60
61 extern int jfsIOWait(void *);
62 extern int jfs_lazycommit(void *);
63 extern int jfs_sync(void *);
64 extern void jfs_clear_inode(struct inode *inode);
65 extern void jfs_read_inode(struct inode *inode);
66 extern void jfs_dirty_inode(struct inode *inode);
67 extern void jfs_delete_inode(struct inode *inode);
68 extern void jfs_write_inode(struct inode *inode, int wait);
69 extern int jfs_extendfs(struct super_block *, s64, int);
70
71 #ifdef PROC_FS_JFS /* see jfs_debug.h */
72 extern void jfs_proc_init(void);
73 extern void jfs_proc_clean(void);
74 #endif
75
76 extern wait_queue_head_t jfs_IO_thread_wait;
77 extern wait_queue_head_t jfs_commit_thread_wait;
78 extern wait_queue_head_t jfs_sync_thread_wait;
79
jfs_handle_error(struct super_block * sb)80 static void jfs_handle_error(struct super_block *sb)
81 {
82 struct jfs_sb_info *sbi = JFS_SBI(sb);
83
84 if (sb->s_flags & MS_RDONLY)
85 return;
86
87 updateSuper(sb, FM_DIRTY);
88
89 if (sbi->flag & JFS_ERR_PANIC)
90 panic("JFS (device %s): panic forced after error\n",
91 bdevname(sb->s_dev));
92 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
93 jfs_err("ERROR: (device %s): remounting filesystem "
94 "as read-only\n",
95 bdevname(sb->s_dev));
96 sb->s_flags |= MS_RDONLY;
97 }
98
99 /* nothing is done for continue beyond marking the superblock dirty */
100 }
101
jfs_error(struct super_block * sb,const char * function,...)102 void jfs_error(struct super_block *sb, const char * function, ...)
103 {
104 static char error_buf[256];
105 va_list args;
106
107 va_start(args, function);
108 vsprintf(error_buf, function, args);
109 va_end(args);
110
111 printk(KERN_ERR "ERROR: (device %s): %s\n", bdevname(sb->s_dev),
112 error_buf);
113
114 jfs_handle_error(sb);
115 }
116
jfs_statfs(struct super_block * sb,struct statfs * buf)117 static int jfs_statfs(struct super_block *sb, struct statfs *buf)
118 {
119 struct jfs_sb_info *sbi = JFS_SBI(sb);
120 s64 maxinodes;
121 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
122
123 jfs_info("In jfs_statfs");
124 buf->f_type = JFS_SUPER_MAGIC;
125 buf->f_bsize = sbi->bsize;
126 buf->f_blocks = sbi->bmap->db_mapsize;
127 buf->f_bfree = sbi->bmap->db_nfree;
128 buf->f_bavail = sbi->bmap->db_nfree;
129 /*
130 * If we really return the number of allocated & free inodes, some
131 * applications will fail because they won't see enough free inodes.
132 * We'll try to calculate some guess as to how may inodes we can
133 * really allocate
134 *
135 * buf->f_files = atomic_read(&imap->im_numinos);
136 * buf->f_ffree = atomic_read(&imap->im_numfree);
137 */
138 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
139 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
140 << L2INOSPEREXT), (s64) 0xffffffffLL);
141 buf->f_files = maxinodes;
142 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
143 atomic_read(&imap->im_numfree));
144
145 buf->f_namelen = JFS_NAME_MAX;
146 return 0;
147 }
148
jfs_put_super(struct super_block * sb)149 static void jfs_put_super(struct super_block *sb)
150 {
151 struct jfs_sb_info *sbi = JFS_SBI(sb);
152 int rc;
153
154 jfs_info("In jfs_put_super");
155 rc = jfs_umount(sb);
156 if (rc)
157 jfs_err("jfs_umount failed with return code %d", rc);
158 if (sbi->nls_tab) {
159 unload_nls(sbi->nls_tab);
160 sbi->nls_tab = NULL;
161 }
162
163 kfree(sbi);
164 }
165
jfs_get_volume_size(struct super_block * sb)166 s64 jfs_get_volume_size(struct super_block *sb)
167 {
168 uint blocks = 0;
169 s64 bytes;
170 kdev_t dev = sb->s_dev;
171 int major = MAJOR(dev);
172 int minor = MINOR(dev);
173
174 if (blk_size[major]) {
175 blocks = blk_size[major][minor];
176 if (blocks) {
177 bytes = ((s64)blocks) << BLOCK_SIZE_BITS;
178 return bytes >> sb->s_blocksize_bits;
179 }
180 }
181 return 0;
182 }
183
parse_options(char * options,struct super_block * sb,s64 * newLVSize,int * flag)184 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
185 int *flag)
186 {
187 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
188 char *this_char;
189 char *value;
190 struct jfs_sb_info *sbi = JFS_SBI(sb);
191
192 *newLVSize = 0;
193
194 if (!options)
195 return 1;
196 while ((this_char = strsep(&options, ",")) != NULL) {
197 if (!*this_char)
198 continue;
199 if ((value = strchr(this_char, '=')) != NULL)
200 *value++ = 0;
201 if (!strcmp(this_char, "errors")) {
202 if (!value || !*value)
203 goto needs_arg;
204 if (!strcmp(value, "continue")) {
205 *flag &= ~JFS_ERR_REMOUNT_RO;
206 *flag &= ~JFS_ERR_PANIC;
207 *flag |= JFS_ERR_CONTINUE;
208 } else if (!strcmp(value, "remount-ro")) {
209 *flag &= ~JFS_ERR_CONTINUE;
210 *flag &= ~JFS_ERR_PANIC;
211 *flag |= JFS_ERR_REMOUNT_RO;
212 } else if (!strcmp(value, "panic")) {
213 *flag &= ~JFS_ERR_CONTINUE;
214 *flag &= ~JFS_ERR_REMOUNT_RO;
215 *flag |= JFS_ERR_PANIC;
216 } else {
217 printk(KERN_ERR "JFS: %s is an invalid error handler\n", value);
218 goto cleanup;
219 }
220 } else if (!strcmp(this_char, "integrity")) {
221 *flag &= ~JFS_NOINTEGRITY;
222 } else if (!strcmp(this_char, "nointegrity")) {
223 *flag |= JFS_NOINTEGRITY;
224 } else if (!strcmp(this_char, "iocharset")) {
225 if (!value || !*value)
226 goto needs_arg;
227 if (nls_map && nls_map != (void *) -1)
228 unload_nls(nls_map);
229 if (!strcmp(value, "none"))
230 nls_map = NULL;
231 else
232 nls_map = load_nls(value);
233 } else if (!strcmp(this_char, "resize")) {
234 if (!value || !*value) {
235 *newLVSize = jfs_get_volume_size(sb);
236 if (*newLVSize == 0)
237 printk(KERN_ERR
238 "JFS: Cannot determine volume size\n");
239 } else
240 *newLVSize = simple_strtoull(value, &value, 0);
241
242 /* Silently ignore the quota options */
243 } else if (!strcmp(this_char, "grpquota")
244 || !strcmp(this_char, "noquota")
245 || !strcmp(this_char, "quota")
246 || !strcmp(this_char, "usrquota"))
247 /* Don't do anything ;-) */ ;
248 else {
249 printk("jfs: Unrecognized mount option %s\n",
250 this_char);
251 goto cleanup;
252 }
253 }
254 if (nls_map != (void *) -1) {
255 /* Discard old (if remount) */
256 if (sbi->nls_tab && sbi->nls_tab != (void *) -1)
257 unload_nls(sbi->nls_tab);
258 sbi->nls_tab = nls_map;
259 }
260 return 1;
261 needs_arg:
262 printk(KERN_ERR "JFS: %s needs an argument\n", this_char);
263 cleanup:
264 if (nls_map && nls_map != (void *) -1)
265 unload_nls(nls_map);
266 return 0;
267 }
268
jfs_remount(struct super_block * sb,int * flags,char * data)269 static int jfs_remount(struct super_block *sb, int *flags, char *data)
270 {
271 s64 newLVSize = 0;
272 int rc = 0;
273 int flag = JFS_SBI(sb)->flag;
274
275 if (!parse_options(data, sb, &newLVSize, &flag)) {
276 return -EINVAL;
277 }
278 if (newLVSize) {
279 if (sb->s_flags & MS_RDONLY) {
280 printk(KERN_ERR
281 "JFS: resize requires volume to be mounted read-write\n");
282 return -EROFS;
283 }
284 rc = jfs_extendfs(sb, newLVSize, 0);
285 if (rc)
286 return rc;
287 }
288
289 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
290 JFS_SBI(sb)->flag = flag;
291 return jfs_mount_rw(sb, 1);
292 }
293 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
294 rc = jfs_umount_rw(sb);
295 JFS_SBI(sb)->flag = flag;
296 return rc;
297 }
298 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
299 if (!(sb->s_flags & MS_RDONLY)) {
300 rc = jfs_umount_rw(sb);
301 if (rc)
302 return rc;
303 JFS_SBI(sb)->flag = flag;
304 return jfs_mount_rw(sb, 1);
305 }
306 JFS_SBI(sb)->flag = flag;
307
308 return 0;
309 }
310
jfs_read_super(struct super_block * sb,void * data,int silent)311 static struct super_block *jfs_read_super(struct super_block *sb,
312 void *data, int silent)
313 {
314 struct jfs_sb_info *sbi;
315 struct inode *inode;
316 int rc;
317 s64 newLVSize = 0;
318 int flag;
319
320 jfs_info("In jfs_read_super s_dev=0x%x s_flags=0x%lx", sb->s_dev,
321 sb->s_flags);
322
323 sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
324 if (!sbi)
325 return NULL;
326 memset(sbi, 0, sizeof (struct jfs_sb_info));
327 sb->u.generic_sbp = sbi;
328
329 /* initialize the mount flag and determine the default error handler */
330 flag = JFS_ERR_REMOUNT_RO;
331
332 /* nls_tab will be set to NULL if no character mapping is requested */
333 sbi->nls_tab = (void *) -1;
334 if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
335 kfree(sbi);
336 return NULL;
337 }
338 sbi->flag = flag;
339
340 if (newLVSize) {
341 printk(KERN_ERR "resize option for remount only\n");
342 return NULL;
343 }
344
345 /*
346 * Initialize blocksize to 4K.
347 */
348 sb_set_blocksize(sb, PSIZE);
349
350 /*
351 * Set method vectors.
352 */
353 sb->s_op = &jfs_super_operations;
354
355 rc = jfs_mount(sb);
356 if (rc) {
357 if (!silent) {
358 jfs_err("jfs_mount failed w/return code = %d", rc);
359 }
360 goto out_kfree;
361 }
362 if (sb->s_flags & MS_RDONLY)
363 sbi->log = 0;
364 else {
365 rc = jfs_mount_rw(sb, 0);
366 if (rc) {
367 if (!silent) {
368 jfs_err("jfs_mount_rw failed, return code = %d",
369 rc);
370 }
371 goto out_no_rw;
372 }
373 }
374
375 sb->s_magic = JFS_SUPER_MAGIC;
376
377 inode = iget(sb, ROOT_I);
378 if (!inode || is_bad_inode(inode))
379 goto out_no_root;
380 sb->s_root = d_alloc_root(inode);
381 if (!sb->s_root)
382 goto out_no_root;
383
384 if (sbi->nls_tab == (void *) -1)
385 sbi->nls_tab = load_nls_default();
386
387 /* logical blocks are represented by 40 bits in pxd_t, etc. */
388 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
389 #if BITS_PER_LONG == 32
390 /*
391 * Page cache is indexed by long.
392 * I would use MAX_LFS_FILESIZE, but it's only half as big
393 */
394 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
395 #endif
396
397 return sb;
398
399 out_no_root:
400 jfs_err("jfs_read_super: get root inode failed");
401 if (inode)
402 iput(inode);
403
404 out_no_rw:
405 rc = jfs_umount(sb);
406 if (rc) {
407 jfs_err("jfs_umount failed with return code %d", rc);
408 }
409 out_kfree:
410 if (sbi->nls_tab && sbi->nls_tab != (void *) -1)
411 unload_nls(sbi->nls_tab);
412 kfree(sbi);
413 return NULL;
414 }
415
jfs_write_super_lockfs(struct super_block * sb)416 static void jfs_write_super_lockfs(struct super_block *sb)
417 {
418 struct jfs_sb_info *sbi = JFS_SBI(sb);
419 struct jfs_log *log = sbi->log;
420
421 if (!(sb->s_flags & MS_RDONLY)) {
422 txQuiesce(sb);
423 lmLogShutdown(log);
424 updateSuper(sb, FM_CLEAN);
425 }
426 }
427
jfs_unlockfs(struct super_block * sb)428 static void jfs_unlockfs(struct super_block *sb)
429 {
430 struct jfs_sb_info *sbi = JFS_SBI(sb);
431 struct jfs_log *log = sbi->log;
432 int rc = 0;
433
434 if (!(sb->s_flags & MS_RDONLY)) {
435 updateSuper(sb, FM_MOUNT);
436 if ((rc = lmLogInit(log)))
437 jfs_err("jfs_unlock failed with return code %d", rc);
438 else
439 txResume(sb);
440 }
441 }
442
443
jfs_sync_fs(struct super_block * sb)444 static int jfs_sync_fs(struct super_block *sb)
445 {
446 struct jfs_log *log = JFS_SBI(sb)->log;
447
448 /* log == NULL indicates read-only mount */
449 if (log)
450 jfs_flush_journal(log, 1);
451
452 return 0;
453 }
454
455 static struct super_operations jfs_super_operations = {
456 .read_inode = jfs_read_inode,
457 .dirty_inode = jfs_dirty_inode,
458 .write_inode = jfs_write_inode,
459 .clear_inode = jfs_clear_inode,
460 .delete_inode = jfs_delete_inode,
461 .put_super = jfs_put_super,
462 .sync_fs = jfs_sync_fs,
463 .write_super_lockfs = jfs_write_super_lockfs,
464 .unlockfs = jfs_unlockfs,
465 .statfs = jfs_statfs,
466 .remount_fs = jfs_remount,
467 };
468
469 static struct file_system_type jfs_fs_type = {
470 .owner = THIS_MODULE,
471 .name = "jfs",
472 .read_super = jfs_read_super,
473 .fs_flags = FS_REQUIRES_DEV,
474 };
475
476 extern int metapage_init(void);
477 extern int txInit(void);
478 extern void txExit(void);
479 extern void metapage_exit(void);
480
init_once(void * foo,kmem_cache_t * cachep,unsigned long flags)481 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
482 {
483 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
484
485 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
486 SLAB_CTOR_CONSTRUCTOR) {
487 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
488 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
489 init_rwsem(&jfs_ip->rdwrlock);
490 init_MUTEX(&jfs_ip->commit_sem);
491 spin_lock_init(&jfs_ip->ag_lock);
492 jfs_ip->active_ag = -1;
493 }
494 }
495
init_jfs_fs(void)496 static int __init init_jfs_fs(void)
497 {
498 int rc;
499
500 jfs_inode_cachep =
501 kmem_cache_create("jfs_ip", sizeof (struct jfs_inode_info), 0, 0,
502 init_once, NULL);
503 if (jfs_inode_cachep == NULL)
504 return -ENOMEM;
505
506 /*
507 * Metapage initialization
508 */
509 rc = metapage_init();
510 if (rc) {
511 jfs_err("metapage_init failed w/rc = %d", rc);
512 goto free_slab;
513 }
514
515 /*
516 * Transaction Manager initialization
517 */
518 rc = txInit();
519 if (rc) {
520 jfs_err("txInit failed w/rc = %d", rc);
521 goto free_metapage;
522 }
523
524 /*
525 * I/O completion thread (endio)
526 */
527 jfsIOthread = kernel_thread(jfsIOWait, 0,
528 CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
529 if (jfsIOthread < 0) {
530 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
531 goto end_txmngr;
532 }
533 wait_for_completion(&jfsIOwait); /* Wait until thread starts */
534
535 jfsCommitThread = kernel_thread(jfs_lazycommit, 0,
536 CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
537 if (jfsCommitThread < 0) {
538 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsCommitThread);
539 goto kill_iotask;
540 }
541 wait_for_completion(&jfsIOwait); /* Wait until thread starts */
542
543 jfsSyncThread = kernel_thread(jfs_sync, 0,
544 CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
545 if (jfsSyncThread < 0) {
546 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
547 goto kill_committask;
548 }
549 wait_for_completion(&jfsIOwait); /* Wait until thread starts */
550
551 #ifdef PROC_FS_JFS
552 jfs_proc_init();
553 #endif
554
555 return register_filesystem(&jfs_fs_type);
556
557 kill_committask:
558 jfs_stop_threads = 1;
559 wake_up(&jfs_commit_thread_wait);
560 wait_for_completion(&jfsIOwait); /* Wait for thread exit */
561 kill_iotask:
562 jfs_stop_threads = 1;
563 wake_up(&jfs_IO_thread_wait);
564 wait_for_completion(&jfsIOwait); /* Wait for thread exit */
565 end_txmngr:
566 txExit();
567 free_metapage:
568 metapage_exit();
569 free_slab:
570 kmem_cache_destroy(jfs_inode_cachep);
571 return rc;
572 }
573
exit_jfs_fs(void)574 static void __exit exit_jfs_fs(void)
575 {
576 jfs_info("exit_jfs_fs called");
577
578 jfs_stop_threads = 1;
579 txExit();
580 metapage_exit();
581 wake_up(&jfs_IO_thread_wait);
582 wait_for_completion(&jfsIOwait); /* Wait for IO thread exit */
583 wake_up(&jfs_commit_thread_wait);
584 wait_for_completion(&jfsIOwait); /* Wait for Commit thread exit */
585 wake_up(&jfs_sync_thread_wait);
586 wait_for_completion(&jfsIOwait); /* Wait for Sync thread exit */
587 #ifdef PROC_FS_JFS
588 jfs_proc_clean();
589 #endif
590 unregister_filesystem(&jfs_fs_type);
591 kmem_cache_destroy(jfs_inode_cachep);
592 }
593
594 EXPORT_NO_SYMBOLS;
595
596 module_init(init_jfs_fs)
597 module_exit(exit_jfs_fs)
598