blob: 314bb4ff1ba8a185715c8979feee658613eb6f13 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Dave Kleikamp63f83c92006-10-02 09:55:27 -05007 * the Free Software Foundation; either version 2 of the License, or
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * (at your option) any later version.
Dave Kleikamp63f83c92006-10-02 09:55:27 -05009 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 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
Dave Kleikamp63f83c92006-10-02 09:55:27 -050016 * along with this program; if not, write to the Free Software
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/module.h>
22#include <linux/parser.h>
23#include <linux/completion.h>
24#include <linux/vfs.h>
Mark Bellon8fc27512005-09-06 15:16:54 -070025#include <linux/mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/moduleparam.h>
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -060027#include <linux/kthread.h>
Christoph Hellwig9a59f452005-06-23 00:10:19 -070028#include <linux/posix_acl.h>
Dave Kleikamp115ff502006-07-26 14:52:13 -050029#include <linux/buffer_head.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070030#include <linux/exportfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/uaccess.h>
Mark Bellon8fc27512005-09-06 15:16:54 -070032#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34#include "jfs_incore.h"
35#include "jfs_filsys.h"
Dave Kleikamp1868f4a2005-05-04 15:29:35 -050036#include "jfs_inode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "jfs_metapage.h"
38#include "jfs_superblock.h"
39#include "jfs_dmap.h"
40#include "jfs_imap.h"
41#include "jfs_acl.h"
42#include "jfs_debug.h"
43
44MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
45MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
46MODULE_LICENSE("GPL");
47
Christoph Lametere18b8902006-12-06 20:33:20 -080048static struct kmem_cache * jfs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080050static const struct super_operations jfs_super_operations;
Christoph Hellwig39655162007-10-21 16:42:17 -070051static const struct export_operations jfs_export_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052static struct file_system_type jfs_fs_type;
53
54#define MAX_COMMIT_THREADS 64
55static int commit_threads = 0;
56module_param(commit_threads, int, 0);
57MODULE_PARM_DESC(commit_threads, "Number of commit threads");
58
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -060059static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
60struct task_struct *jfsIOthread;
61struct task_struct *jfsSyncThread;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63#ifdef CONFIG_JFS_DEBUG
64int jfsloglevel = JFS_LOGLEVEL_WARN;
65module_param(jfsloglevel, int, 0644);
66MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
67#endif
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069static void jfs_handle_error(struct super_block *sb)
70{
71 struct jfs_sb_info *sbi = JFS_SBI(sb);
72
73 if (sb->s_flags & MS_RDONLY)
74 return;
75
76 updateSuper(sb, FM_DIRTY);
77
78 if (sbi->flag & JFS_ERR_PANIC)
79 panic("JFS (device %s): panic forced after error\n",
80 sb->s_id);
81 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
82 jfs_err("ERROR: (device %s): remounting filesystem "
83 "as read-only\n",
84 sb->s_id);
85 sb->s_flags |= MS_RDONLY;
Dave Kleikamp63f83c92006-10-02 09:55:27 -050086 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 /* nothing is done for continue beyond marking the superblock dirty */
89}
90
91void jfs_error(struct super_block *sb, const char * function, ...)
92{
93 static char error_buf[256];
94 va_list args;
95
96 va_start(args, function);
Alexey Dobriyan4a6e6172006-12-06 20:37:04 -080097 vsnprintf(error_buf, sizeof(error_buf), function, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 va_end(args);
99
100 printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
101
102 jfs_handle_error(sb);
103}
104
105static struct inode *jfs_alloc_inode(struct super_block *sb)
106{
107 struct jfs_inode_info *jfs_inode;
108
109 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
110 if (!jfs_inode)
111 return NULL;
112 return &jfs_inode->vfs_inode;
113}
114
115static void jfs_destroy_inode(struct inode *inode)
116{
117 struct jfs_inode_info *ji = JFS_IP(inode);
118
Dave Kleikamp8a9cd6d2005-08-10 11:14:39 -0500119 BUG_ON(!list_empty(&ji->anon_inode_list));
120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 spin_lock_irq(&ji->ag_lock);
122 if (ji->active_ag != -1) {
123 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
124 atomic_dec(&bmap->db_active[ji->active_ag]);
125 ji->active_ag = -1;
126 }
127 spin_unlock_irq(&ji->ag_lock);
128
129#ifdef CONFIG_JFS_POSIX_ACL
130 if (ji->i_acl != JFS_ACL_NOT_CACHED) {
131 posix_acl_release(ji->i_acl);
132 ji->i_acl = JFS_ACL_NOT_CACHED;
133 }
134 if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
135 posix_acl_release(ji->i_default_acl);
136 ji->i_default_acl = JFS_ACL_NOT_CACHED;
137 }
138#endif
139
140 kmem_cache_free(jfs_inode_cachep, ji);
141}
142
David Howells726c3342006-06-23 02:02:58 -0700143static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
David Howells726c3342006-06-23 02:02:58 -0700145 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 s64 maxinodes;
147 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
148
149 jfs_info("In jfs_statfs");
150 buf->f_type = JFS_SUPER_MAGIC;
151 buf->f_bsize = sbi->bsize;
152 buf->f_blocks = sbi->bmap->db_mapsize;
153 buf->f_bfree = sbi->bmap->db_nfree;
154 buf->f_bavail = sbi->bmap->db_nfree;
155 /*
156 * If we really return the number of allocated & free inodes, some
157 * applications will fail because they won't see enough free inodes.
158 * We'll try to calculate some guess as to how may inodes we can
159 * really allocate
160 *
161 * buf->f_files = atomic_read(&imap->im_numinos);
162 * buf->f_ffree = atomic_read(&imap->im_numfree);
163 */
164 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
165 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
166 << L2INOSPEREXT), (s64) 0xffffffffLL);
167 buf->f_files = maxinodes;
168 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
169 atomic_read(&imap->im_numfree));
170
171 buf->f_namelen = JFS_NAME_MAX;
172 return 0;
173}
174
175static void jfs_put_super(struct super_block *sb)
176{
177 struct jfs_sb_info *sbi = JFS_SBI(sb);
178 int rc;
179
180 jfs_info("In jfs_put_super");
181 rc = jfs_umount(sb);
182 if (rc)
183 jfs_err("jfs_umount failed with return code %d", rc);
184 if (sbi->nls_tab)
185 unload_nls(sbi->nls_tab);
186 sbi->nls_tab = NULL;
187
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600188 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
189 iput(sbi->direct_inode);
190 sbi->direct_inode = NULL;
191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 kfree(sbi);
193}
194
195enum {
196 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
Mark Bellon8fc27512005-09-06 15:16:54 -0700197 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
Dave Kleikamp69eb66d2006-03-09 13:59:30 -0600198 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199};
200
201static match_table_t tokens = {
202 {Opt_integrity, "integrity"},
203 {Opt_nointegrity, "nointegrity"},
204 {Opt_iocharset, "iocharset=%s"},
205 {Opt_resize, "resize=%u"},
206 {Opt_resize_nosize, "resize"},
207 {Opt_errors, "errors=%s"},
208 {Opt_ignore, "noquota"},
209 {Opt_ignore, "quota"},
Mark Bellon8fc27512005-09-06 15:16:54 -0700210 {Opt_usrquota, "usrquota"},
211 {Opt_grpquota, "grpquota"},
Dave Kleikamp69eb66d2006-03-09 13:59:30 -0600212 {Opt_uid, "uid=%u"},
213 {Opt_gid, "gid=%u"},
214 {Opt_umask, "umask=%u"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 {Opt_err, NULL}
216};
217
218static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
219 int *flag)
220{
221 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
222 char *p;
223 struct jfs_sb_info *sbi = JFS_SBI(sb);
224
225 *newLVSize = 0;
226
227 if (!options)
228 return 1;
229
230 while ((p = strsep(&options, ",")) != NULL) {
231 substring_t args[MAX_OPT_ARGS];
232 int token;
233 if (!*p)
234 continue;
235
236 token = match_token(p, tokens, args);
237 switch (token) {
238 case Opt_integrity:
239 *flag &= ~JFS_NOINTEGRITY;
240 break;
241 case Opt_nointegrity:
242 *flag |= JFS_NOINTEGRITY;
243 break;
244 case Opt_ignore:
245 /* Silently ignore the quota options */
246 /* Don't do anything ;-) */
247 break;
248 case Opt_iocharset:
249 if (nls_map && nls_map != (void *) -1)
250 unload_nls(nls_map);
251 if (!strcmp(args[0].from, "none"))
252 nls_map = NULL;
253 else {
254 nls_map = load_nls(args[0].from);
255 if (!nls_map) {
256 printk(KERN_ERR
257 "JFS: charset not found\n");
258 goto cleanup;
259 }
260 }
261 break;
262 case Opt_resize:
263 {
264 char *resize = args[0].from;
265 *newLVSize = simple_strtoull(resize, &resize, 0);
266 break;
267 }
268 case Opt_resize_nosize:
269 {
270 *newLVSize = sb->s_bdev->bd_inode->i_size >>
271 sb->s_blocksize_bits;
272 if (*newLVSize == 0)
273 printk(KERN_ERR
274 "JFS: Cannot determine volume size\n");
275 break;
276 }
277 case Opt_errors:
278 {
279 char *errors = args[0].from;
280 if (!errors || !*errors)
281 goto cleanup;
282 if (!strcmp(errors, "continue")) {
283 *flag &= ~JFS_ERR_REMOUNT_RO;
284 *flag &= ~JFS_ERR_PANIC;
285 *flag |= JFS_ERR_CONTINUE;
286 } else if (!strcmp(errors, "remount-ro")) {
287 *flag &= ~JFS_ERR_CONTINUE;
288 *flag &= ~JFS_ERR_PANIC;
289 *flag |= JFS_ERR_REMOUNT_RO;
290 } else if (!strcmp(errors, "panic")) {
291 *flag &= ~JFS_ERR_CONTINUE;
292 *flag &= ~JFS_ERR_REMOUNT_RO;
293 *flag |= JFS_ERR_PANIC;
294 } else {
295 printk(KERN_ERR
296 "JFS: %s is an invalid error handler\n",
297 errors);
298 goto cleanup;
299 }
300 break;
301 }
Mark Bellon8fc27512005-09-06 15:16:54 -0700302
Dave Kleikamp115ff502006-07-26 14:52:13 -0500303#ifdef CONFIG_QUOTA
Mark Bellon8fc27512005-09-06 15:16:54 -0700304 case Opt_quota:
305 case Opt_usrquota:
306 *flag |= JFS_USRQUOTA;
307 break;
308 case Opt_grpquota:
309 *flag |= JFS_GRPQUOTA;
310 break;
311#else
312 case Opt_usrquota:
313 case Opt_grpquota:
314 case Opt_quota:
315 printk(KERN_ERR
316 "JFS: quota operations not supported\n");
317 break;
318#endif
Dave Kleikamp69eb66d2006-03-09 13:59:30 -0600319 case Opt_uid:
320 {
321 char *uid = args[0].from;
322 sbi->uid = simple_strtoul(uid, &uid, 0);
323 break;
324 }
325 case Opt_gid:
326 {
327 char *gid = args[0].from;
328 sbi->gid = simple_strtoul(gid, &gid, 0);
329 break;
330 }
331 case Opt_umask:
332 {
333 char *umask = args[0].from;
334 sbi->umask = simple_strtoul(umask, &umask, 8);
335 if (sbi->umask & ~0777) {
336 printk(KERN_ERR
337 "JFS: Invalid value of umask\n");
338 goto cleanup;
339 }
340 break;
341 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 default:
343 printk("jfs: Unrecognized mount option \"%s\" "
344 " or missing value\n", p);
345 goto cleanup;
346 }
347 }
348
349 if (nls_map != (void *) -1) {
350 /* Discard old (if remount) */
351 if (sbi->nls_tab)
352 unload_nls(sbi->nls_tab);
353 sbi->nls_tab = nls_map;
354 }
355 return 1;
356
357cleanup:
358 if (nls_map && nls_map != (void *) -1)
359 unload_nls(nls_map);
360 return 0;
361}
362
363static int jfs_remount(struct super_block *sb, int *flags, char *data)
364{
365 s64 newLVSize = 0;
366 int rc = 0;
367 int flag = JFS_SBI(sb)->flag;
368
369 if (!parse_options(data, sb, &newLVSize, &flag)) {
370 return -EINVAL;
371 }
372 if (newLVSize) {
373 if (sb->s_flags & MS_RDONLY) {
374 printk(KERN_ERR
375 "JFS: resize requires volume to be mounted read-write\n");
376 return -EROFS;
377 }
378 rc = jfs_extendfs(sb, newLVSize, 0);
379 if (rc)
380 return rc;
381 }
382
383 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600384 /*
385 * Invalidate any previously read metadata. fsck may have
386 * changed the on-disk data since we mounted r/o
387 */
388 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 JFS_SBI(sb)->flag = flag;
391 return jfs_mount_rw(sb, 1);
392 }
393 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
394 rc = jfs_umount_rw(sb);
395 JFS_SBI(sb)->flag = flag;
396 return rc;
397 }
398 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
399 if (!(sb->s_flags & MS_RDONLY)) {
400 rc = jfs_umount_rw(sb);
401 if (rc)
402 return rc;
403 JFS_SBI(sb)->flag = flag;
404 return jfs_mount_rw(sb, 1);
405 }
406 JFS_SBI(sb)->flag = flag;
407
408 return 0;
409}
410
411static int jfs_fill_super(struct super_block *sb, void *data, int silent)
412{
413 struct jfs_sb_info *sbi;
414 struct inode *inode;
415 int rc;
416 s64 newLVSize = 0;
417 int flag;
418
419 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
420
421 if (!new_valid_dev(sb->s_bdev->bd_dev))
422 return -EOVERFLOW;
423
Eric Sesterhenn5b3030e2006-02-23 09:47:13 -0600424 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 if (!sbi)
Akinobu Mita087387f2006-09-14 09:22:38 -0500426 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 sb->s_fs_info = sbi;
428 sbi->sb = sb;
Dave Kleikamp69eb66d2006-03-09 13:59:30 -0600429 sbi->uid = sbi->gid = sbi->umask = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431 /* initialize the mount flag and determine the default error handler */
432 flag = JFS_ERR_REMOUNT_RO;
433
434 if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
435 kfree(sbi);
436 return -EINVAL;
437 }
438 sbi->flag = flag;
439
440#ifdef CONFIG_JFS_POSIX_ACL
441 sb->s_flags |= MS_POSIXACL;
442#endif
443
444 if (newLVSize) {
445 printk(KERN_ERR "resize option for remount only\n");
446 return -EINVAL;
447 }
448
449 /*
450 * Initialize blocksize to 4K.
451 */
452 sb_set_blocksize(sb, PSIZE);
453
454 /*
455 * Set method vectors.
456 */
457 sb->s_op = &jfs_super_operations;
458 sb->s_export_op = &jfs_export_operations;
459
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600460 /*
461 * Initialize direct-mapping inode/address-space
462 */
463 inode = new_inode(sb);
464 if (inode == NULL)
465 goto out_kfree;
466 inode->i_ino = 0;
467 inode->i_nlink = 1;
468 inode->i_size = sb->s_bdev->bd_inode->i_size;
469 inode->i_mapping->a_ops = &jfs_metapage_aops;
Dave Kleikampac17b8b2005-10-03 15:32:11 -0500470 insert_inode_hash(inode);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600471 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
472
473 sbi->direct_inode = inode;
474
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 rc = jfs_mount(sb);
476 if (rc) {
477 if (!silent) {
478 jfs_err("jfs_mount failed w/return code = %d", rc);
479 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600480 goto out_mount_failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 }
482 if (sb->s_flags & MS_RDONLY)
483 sbi->log = NULL;
484 else {
485 rc = jfs_mount_rw(sb, 0);
486 if (rc) {
487 if (!silent) {
488 jfs_err("jfs_mount_rw failed, return code = %d",
489 rc);
490 }
491 goto out_no_rw;
492 }
493 }
494
495 sb->s_magic = JFS_SUPER_MAGIC;
496
497 inode = iget(sb, ROOT_I);
498 if (!inode || is_bad_inode(inode))
499 goto out_no_root;
500 sb->s_root = d_alloc_root(inode);
501 if (!sb->s_root)
502 goto out_no_root;
503
504 if (sbi->mntflag & JFS_OS2)
505 sb->s_root->d_op = &jfs_ci_dentry_operations;
506
507 /* logical blocks are represented by 40 bits in pxd_t, etc. */
508 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
509#if BITS_PER_LONG == 32
510 /*
511 * Page cache is indexed by long.
512 * I would use MAX_LFS_FILESIZE, but it's only half as big
513 */
514 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
515#endif
516 sb->s_time_gran = 1;
517 return 0;
518
519out_no_root:
520 jfs_err("jfs_read_super: get root inode failed");
521 if (inode)
522 iput(inode);
523
524out_no_rw:
525 rc = jfs_umount(sb);
526 if (rc) {
527 jfs_err("jfs_umount failed with return code %d", rc);
528 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600529out_mount_failed:
OGAWA Hirofumi28fd1292006-01-08 01:02:14 -0800530 filemap_write_and_wait(sbi->direct_inode->i_mapping);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600531 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
532 make_bad_inode(sbi->direct_inode);
533 iput(sbi->direct_inode);
534 sbi->direct_inode = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535out_kfree:
536 if (sbi->nls_tab)
537 unload_nls(sbi->nls_tab);
538 kfree(sbi);
539 return -EINVAL;
540}
541
542static void jfs_write_super_lockfs(struct super_block *sb)
543{
544 struct jfs_sb_info *sbi = JFS_SBI(sb);
545 struct jfs_log *log = sbi->log;
546
547 if (!(sb->s_flags & MS_RDONLY)) {
548 txQuiesce(sb);
549 lmLogShutdown(log);
550 updateSuper(sb, FM_CLEAN);
551 }
552}
553
554static void jfs_unlockfs(struct super_block *sb)
555{
556 struct jfs_sb_info *sbi = JFS_SBI(sb);
557 struct jfs_log *log = sbi->log;
558 int rc = 0;
559
560 if (!(sb->s_flags & MS_RDONLY)) {
561 updateSuper(sb, FM_MOUNT);
562 if ((rc = lmLogInit(log)))
563 jfs_err("jfs_unlock failed with return code %d", rc);
564 else
565 txResume(sb);
566 }
567}
568
David Howells454e2392006-06-23 02:02:57 -0700569static int jfs_get_sb(struct file_system_type *fs_type,
570 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571{
David Howells454e2392006-06-23 02:02:57 -0700572 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
573 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574}
575
576static int jfs_sync_fs(struct super_block *sb, int wait)
577{
578 struct jfs_log *log = JFS_SBI(sb)->log;
579
580 /* log == NULL indicates read-only mount */
Dave Kleikamp1c627822005-05-02 12:25:08 -0600581 if (log) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 jfs_flush_journal(log, wait);
Dave Kleikampcbc3d652005-07-27 09:17:57 -0500583 jfs_syncpt(log, 0);
Dave Kleikamp1c627822005-05-02 12:25:08 -0600584 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
586 return 0;
587}
588
Mark Bellon8fc27512005-09-06 15:16:54 -0700589static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
590{
591 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
592
Dave Kleikamp69eb66d2006-03-09 13:59:30 -0600593 if (sbi->uid != -1)
594 seq_printf(seq, ",uid=%d", sbi->uid);
595 if (sbi->gid != -1)
596 seq_printf(seq, ",gid=%d", sbi->gid);
597 if (sbi->umask != -1)
598 seq_printf(seq, ",umask=%03o", sbi->umask);
Mark Bellon8fc27512005-09-06 15:16:54 -0700599 if (sbi->flag & JFS_NOINTEGRITY)
600 seq_puts(seq, ",nointegrity");
Mark Bellon8fc27512005-09-06 15:16:54 -0700601
Dave Kleikamp115ff502006-07-26 14:52:13 -0500602#ifdef CONFIG_QUOTA
Mark Bellon8fc27512005-09-06 15:16:54 -0700603 if (sbi->flag & JFS_USRQUOTA)
604 seq_puts(seq, ",usrquota");
605
606 if (sbi->flag & JFS_GRPQUOTA)
607 seq_puts(seq, ",grpquota");
608#endif
609
610 return 0;
611}
612
Dave Kleikamp115ff502006-07-26 14:52:13 -0500613#ifdef CONFIG_QUOTA
614
615/* Read data from quotafile - avoid pagecache and such because we cannot afford
616 * acquiring the locks... As quota files are never truncated and quota code
617 * itself serializes the operations (and noone else should touch the files)
618 * we don't have to be afraid of races */
619static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
620 size_t len, loff_t off)
621{
622 struct inode *inode = sb_dqopt(sb)->files[type];
623 sector_t blk = off >> sb->s_blocksize_bits;
624 int err = 0;
625 int offset = off & (sb->s_blocksize - 1);
626 int tocopy;
627 size_t toread;
628 struct buffer_head tmp_bh;
629 struct buffer_head *bh;
630 loff_t i_size = i_size_read(inode);
631
632 if (off > i_size)
633 return 0;
634 if (off+len > i_size)
635 len = i_size-off;
636 toread = len;
637 while (toread > 0) {
638 tocopy = sb->s_blocksize - offset < toread ?
639 sb->s_blocksize - offset : toread;
640
641 tmp_bh.b_state = 0;
642 tmp_bh.b_size = 1 << inode->i_blkbits;
643 err = jfs_get_block(inode, blk, &tmp_bh, 0);
644 if (err)
645 return err;
646 if (!buffer_mapped(&tmp_bh)) /* A hole? */
647 memset(data, 0, tocopy);
648 else {
649 bh = sb_bread(sb, tmp_bh.b_blocknr);
650 if (!bh)
651 return -EIO;
652 memcpy(data, bh->b_data+offset, tocopy);
653 brelse(bh);
654 }
655 offset = 0;
656 toread -= tocopy;
657 data += tocopy;
658 blk++;
659 }
660 return len;
661}
662
663/* Write to quotafile */
664static ssize_t jfs_quota_write(struct super_block *sb, int type,
665 const char *data, size_t len, loff_t off)
666{
667 struct inode *inode = sb_dqopt(sb)->files[type];
668 sector_t blk = off >> sb->s_blocksize_bits;
669 int err = 0;
670 int offset = off & (sb->s_blocksize - 1);
671 int tocopy;
672 size_t towrite = len;
673 struct buffer_head tmp_bh;
674 struct buffer_head *bh;
675
676 mutex_lock(&inode->i_mutex);
677 while (towrite > 0) {
678 tocopy = sb->s_blocksize - offset < towrite ?
679 sb->s_blocksize - offset : towrite;
680
681 tmp_bh.b_state = 0;
Dave Kleikamp8bcb2832006-07-28 08:46:05 -0500682 tmp_bh.b_size = 1 << inode->i_blkbits;
Dave Kleikamp115ff502006-07-26 14:52:13 -0500683 err = jfs_get_block(inode, blk, &tmp_bh, 1);
684 if (err)
685 goto out;
686 if (offset || tocopy != sb->s_blocksize)
687 bh = sb_bread(sb, tmp_bh.b_blocknr);
688 else
689 bh = sb_getblk(sb, tmp_bh.b_blocknr);
690 if (!bh) {
691 err = -EIO;
692 goto out;
693 }
694 lock_buffer(bh);
695 memcpy(bh->b_data+offset, data, tocopy);
696 flush_dcache_page(bh->b_page);
697 set_buffer_uptodate(bh);
698 mark_buffer_dirty(bh);
699 unlock_buffer(bh);
700 brelse(bh);
701 offset = 0;
702 towrite -= tocopy;
703 data += tocopy;
704 blk++;
705 }
706out:
707 if (len == towrite)
708 return err;
709 if (inode->i_size < off+len-towrite)
710 i_size_write(inode, off+len-towrite);
711 inode->i_version++;
712 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
713 mark_inode_dirty(inode);
714 mutex_unlock(&inode->i_mutex);
715 return len - towrite;
716}
717
718#endif
719
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800720static const struct super_operations jfs_super_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 .alloc_inode = jfs_alloc_inode,
722 .destroy_inode = jfs_destroy_inode,
723 .read_inode = jfs_read_inode,
724 .dirty_inode = jfs_dirty_inode,
725 .write_inode = jfs_write_inode,
726 .delete_inode = jfs_delete_inode,
727 .put_super = jfs_put_super,
728 .sync_fs = jfs_sync_fs,
729 .write_super_lockfs = jfs_write_super_lockfs,
730 .unlockfs = jfs_unlockfs,
731 .statfs = jfs_statfs,
732 .remount_fs = jfs_remount,
Dave Kleikamp115ff502006-07-26 14:52:13 -0500733 .show_options = jfs_show_options,
734#ifdef CONFIG_QUOTA
735 .quota_read = jfs_quota_read,
736 .quota_write = jfs_quota_write,
737#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738};
739
Christoph Hellwig39655162007-10-21 16:42:17 -0700740static const struct export_operations jfs_export_operations = {
Christoph Hellwigd425de72007-10-21 16:42:09 -0700741 .fh_to_dentry = jfs_fh_to_dentry,
742 .fh_to_parent = jfs_fh_to_parent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 .get_parent = jfs_get_parent,
744};
745
746static struct file_system_type jfs_fs_type = {
747 .owner = THIS_MODULE,
748 .name = "jfs",
749 .get_sb = jfs_get_sb,
750 .kill_sb = kill_block_super,
751 .fs_flags = FS_REQUIRES_DEV,
752};
753
Christoph Lameter4ba9b9d2007-10-16 23:25:51 -0700754static void init_once(struct kmem_cache *cachep, void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755{
756 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
757
Christoph Lametera35afb82007-05-16 22:10:57 -0700758 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
759 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
760 init_rwsem(&jfs_ip->rdwrlock);
761 mutex_init(&jfs_ip->commit_mutex);
762 init_rwsem(&jfs_ip->xattr_sem);
763 spin_lock_init(&jfs_ip->ag_lock);
764 jfs_ip->active_ag = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765#ifdef CONFIG_JFS_POSIX_ACL
Christoph Lametera35afb82007-05-16 22:10:57 -0700766 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
767 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768#endif
Christoph Lametera35afb82007-05-16 22:10:57 -0700769 inode_init_once(&jfs_ip->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770}
771
772static int __init init_jfs_fs(void)
773{
774 int i;
775 int rc;
776
777 jfs_inode_cachep =
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500778 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800779 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
Paul Mundt20c2df82007-07-20 10:11:58 +0900780 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 if (jfs_inode_cachep == NULL)
782 return -ENOMEM;
783
784 /*
785 * Metapage initialization
786 */
787 rc = metapage_init();
788 if (rc) {
789 jfs_err("metapage_init failed w/rc = %d", rc);
790 goto free_slab;
791 }
792
793 /*
794 * Transaction Manager initialization
795 */
796 rc = txInit();
797 if (rc) {
798 jfs_err("txInit failed w/rc = %d", rc);
799 goto free_metapage;
800 }
801
802 /*
803 * I/O completion thread (endio)
804 */
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -0600805 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
806 if (IS_ERR(jfsIOthread)) {
807 rc = PTR_ERR(jfsIOthread);
808 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 goto end_txmngr;
810 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
812 if (commit_threads < 1)
813 commit_threads = num_online_cpus();
814 if (commit_threads > MAX_COMMIT_THREADS)
815 commit_threads = MAX_COMMIT_THREADS;
816
817 for (i = 0; i < commit_threads; i++) {
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -0600818 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
819 if (IS_ERR(jfsCommitThread[i])) {
820 rc = PTR_ERR(jfsCommitThread[i]);
821 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 commit_threads = i;
823 goto kill_committask;
824 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 }
826
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -0600827 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
828 if (IS_ERR(jfsSyncThread)) {
829 rc = PTR_ERR(jfsSyncThread);
830 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 goto kill_committask;
832 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833
834#ifdef PROC_FS_JFS
835 jfs_proc_init();
836#endif
837
838 return register_filesystem(&jfs_fs_type);
839
840kill_committask:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 for (i = 0; i < commit_threads; i++)
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -0600842 kthread_stop(jfsCommitThread[i]);
843 kthread_stop(jfsIOthread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844end_txmngr:
845 txExit();
846free_metapage:
847 metapage_exit();
848free_slab:
849 kmem_cache_destroy(jfs_inode_cachep);
850 return rc;
851}
852
853static void __exit exit_jfs_fs(void)
854{
855 int i;
856
857 jfs_info("exit_jfs_fs called");
858
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 txExit();
860 metapage_exit();
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -0600861
862 kthread_stop(jfsIOthread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 for (i = 0; i < commit_threads; i++)
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -0600864 kthread_stop(jfsCommitThread[i]);
865 kthread_stop(jfsSyncThread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866#ifdef PROC_FS_JFS
867 jfs_proc_clean();
868#endif
869 unregister_filesystem(&jfs_fs_type);
870 kmem_cache_destroy(jfs_inode_cachep);
871}
872
873module_init(init_jfs_fs)
874module_exit(exit_jfs_fs)