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1 | /* |
2 | * Copyright (C) International Business Machines Corp., 2000-2004 |
3 | * Portions Copyright (C) Christoph Hellwig, 2001-2002 |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
13 | * the GNU General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
19 | |
20 | #include <linux/fs.h> |
21 | #include <linux/module.h> |
22 | #include <linux/parser.h> |
23 | #include <linux/completion.h> |
24 | #include <linux/vfs.h> |
25 | #include <linux/quotaops.h> |
26 | #include <linux/mount.h> |
27 | #include <linux/moduleparam.h> |
28 | #include <linux/kthread.h> |
29 | #include <linux/posix_acl.h> |
30 | #include <linux/buffer_head.h> |
31 | #include <linux/exportfs.h> |
32 | #include <linux/crc32.h> |
33 | #include <linux/slab.h> |
34 | #include <asm/uaccess.h> |
35 | #include <linux/seq_file.h> |
36 | |
37 | #include "jfs_incore.h" |
38 | #include "jfs_filsys.h" |
39 | #include "jfs_inode.h" |
40 | #include "jfs_metapage.h" |
41 | #include "jfs_superblock.h" |
42 | #include "jfs_dmap.h" |
43 | #include "jfs_imap.h" |
44 | #include "jfs_acl.h" |
45 | #include "jfs_debug.h" |
46 | |
47 | MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); |
48 | MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); |
49 | MODULE_LICENSE("GPL"); |
50 | |
51 | static struct kmem_cache * jfs_inode_cachep; |
52 | |
53 | static const struct super_operations jfs_super_operations; |
54 | static const struct export_operations jfs_export_operations; |
55 | static struct file_system_type jfs_fs_type; |
56 | |
57 | #define MAX_COMMIT_THREADS 64 |
58 | static int commit_threads = 0; |
59 | module_param(commit_threads, int, 0); |
60 | MODULE_PARM_DESC(commit_threads, "Number of commit threads"); |
61 | |
62 | static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; |
63 | struct task_struct *jfsIOthread; |
64 | struct task_struct *jfsSyncThread; |
65 | |
66 | #ifdef CONFIG_JFS_DEBUG |
67 | int jfsloglevel = JFS_LOGLEVEL_WARN; |
68 | module_param(jfsloglevel, int, 0644); |
69 | MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); |
70 | #endif |
71 | |
72 | static void jfs_handle_error(struct super_block *sb) |
73 | { |
74 | struct jfs_sb_info *sbi = JFS_SBI(sb); |
75 | |
76 | if (sb->s_flags & MS_RDONLY) |
77 | return; |
78 | |
79 | updateSuper(sb, FM_DIRTY); |
80 | |
81 | if (sbi->flag & JFS_ERR_PANIC) |
82 | panic("JFS (device %s): panic forced after error\n", |
83 | sb->s_id); |
84 | else if (sbi->flag & JFS_ERR_REMOUNT_RO) { |
85 | jfs_err("ERROR: (device %s): remounting filesystem " |
86 | "as read-only\n", |
87 | sb->s_id); |
88 | sb->s_flags |= MS_RDONLY; |
89 | } |
90 | |
91 | /* nothing is done for continue beyond marking the superblock dirty */ |
92 | } |
93 | |
94 | void jfs_error(struct super_block *sb, const char * function, ...) |
95 | { |
96 | static char error_buf[256]; |
97 | va_list args; |
98 | |
99 | va_start(args, function); |
100 | vsnprintf(error_buf, sizeof(error_buf), function, args); |
101 | va_end(args); |
102 | |
103 | printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf); |
104 | |
105 | jfs_handle_error(sb); |
106 | } |
107 | |
108 | static struct inode *jfs_alloc_inode(struct super_block *sb) |
109 | { |
110 | struct jfs_inode_info *jfs_inode; |
111 | |
112 | jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS); |
113 | if (!jfs_inode) |
114 | return NULL; |
115 | return &jfs_inode->vfs_inode; |
116 | } |
117 | |
118 | static void jfs_i_callback(struct rcu_head *head) |
119 | { |
120 | struct inode *inode = container_of(head, struct inode, i_rcu); |
121 | struct jfs_inode_info *ji = JFS_IP(inode); |
122 | INIT_LIST_HEAD(&inode->i_dentry); |
123 | kmem_cache_free(jfs_inode_cachep, ji); |
124 | } |
125 | |
126 | static void jfs_destroy_inode(struct inode *inode) |
127 | { |
128 | struct jfs_inode_info *ji = JFS_IP(inode); |
129 | |
130 | BUG_ON(!list_empty(&ji->anon_inode_list)); |
131 | |
132 | spin_lock_irq(&ji->ag_lock); |
133 | if (ji->active_ag != -1) { |
134 | struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; |
135 | atomic_dec(&bmap->db_active[ji->active_ag]); |
136 | ji->active_ag = -1; |
137 | } |
138 | spin_unlock_irq(&ji->ag_lock); |
139 | call_rcu(&inode->i_rcu, jfs_i_callback); |
140 | } |
141 | |
142 | static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
143 | { |
144 | struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); |
145 | s64 maxinodes; |
146 | struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; |
147 | |
148 | jfs_info("In jfs_statfs"); |
149 | buf->f_type = JFS_SUPER_MAGIC; |
150 | buf->f_bsize = sbi->bsize; |
151 | buf->f_blocks = sbi->bmap->db_mapsize; |
152 | buf->f_bfree = sbi->bmap->db_nfree; |
153 | buf->f_bavail = sbi->bmap->db_nfree; |
154 | /* |
155 | * If we really return the number of allocated & free inodes, some |
156 | * applications will fail because they won't see enough free inodes. |
157 | * We'll try to calculate some guess as to how may inodes we can |
158 | * really allocate |
159 | * |
160 | * buf->f_files = atomic_read(&imap->im_numinos); |
161 | * buf->f_ffree = atomic_read(&imap->im_numfree); |
162 | */ |
163 | maxinodes = min((s64) atomic_read(&imap->im_numinos) + |
164 | ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) |
165 | << L2INOSPEREXT), (s64) 0xffffffffLL); |
166 | buf->f_files = maxinodes; |
167 | buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - |
168 | atomic_read(&imap->im_numfree)); |
169 | buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); |
170 | buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, |
171 | sizeof(sbi->uuid)/2); |
172 | |
173 | buf->f_namelen = JFS_NAME_MAX; |
174 | return 0; |
175 | } |
176 | |
177 | static void jfs_put_super(struct super_block *sb) |
178 | { |
179 | struct jfs_sb_info *sbi = JFS_SBI(sb); |
180 | int rc; |
181 | |
182 | jfs_info("In jfs_put_super"); |
183 | |
184 | dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
185 | |
186 | rc = jfs_umount(sb); |
187 | if (rc) |
188 | jfs_err("jfs_umount failed with return code %d", rc); |
189 | |
190 | unload_nls(sbi->nls_tab); |
191 | |
192 | truncate_inode_pages(sbi->direct_inode->i_mapping, 0); |
193 | iput(sbi->direct_inode); |
194 | |
195 | kfree(sbi); |
196 | } |
197 | |
198 | enum { |
199 | Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, |
200 | Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, |
201 | Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask |
202 | }; |
203 | |
204 | static const match_table_t tokens = { |
205 | {Opt_integrity, "integrity"}, |
206 | {Opt_nointegrity, "nointegrity"}, |
207 | {Opt_iocharset, "iocharset=%s"}, |
208 | {Opt_resize, "resize=%u"}, |
209 | {Opt_resize_nosize, "resize"}, |
210 | {Opt_errors, "errors=%s"}, |
211 | {Opt_ignore, "noquota"}, |
212 | {Opt_ignore, "quota"}, |
213 | {Opt_usrquota, "usrquota"}, |
214 | {Opt_grpquota, "grpquota"}, |
215 | {Opt_uid, "uid=%u"}, |
216 | {Opt_gid, "gid=%u"}, |
217 | {Opt_umask, "umask=%u"}, |
218 | {Opt_err, NULL} |
219 | }; |
220 | |
221 | static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, |
222 | int *flag) |
223 | { |
224 | void *nls_map = (void *)-1; /* -1: no change; NULL: none */ |
225 | char *p; |
226 | struct jfs_sb_info *sbi = JFS_SBI(sb); |
227 | |
228 | *newLVSize = 0; |
229 | |
230 | if (!options) |
231 | return 1; |
232 | |
233 | while ((p = strsep(&options, ",")) != NULL) { |
234 | substring_t args[MAX_OPT_ARGS]; |
235 | int token; |
236 | if (!*p) |
237 | continue; |
238 | |
239 | token = match_token(p, tokens, args); |
240 | switch (token) { |
241 | case Opt_integrity: |
242 | *flag &= ~JFS_NOINTEGRITY; |
243 | break; |
244 | case Opt_nointegrity: |
245 | *flag |= JFS_NOINTEGRITY; |
246 | break; |
247 | case Opt_ignore: |
248 | /* Silently ignore the quota options */ |
249 | /* Don't do anything ;-) */ |
250 | break; |
251 | case Opt_iocharset: |
252 | if (nls_map && nls_map != (void *) -1) |
253 | unload_nls(nls_map); |
254 | if (!strcmp(args[0].from, "none")) |
255 | nls_map = NULL; |
256 | else { |
257 | nls_map = load_nls(args[0].from); |
258 | if (!nls_map) { |
259 | printk(KERN_ERR |
260 | "JFS: charset not found\n"); |
261 | goto cleanup; |
262 | } |
263 | } |
264 | break; |
265 | case Opt_resize: |
266 | { |
267 | char *resize = args[0].from; |
268 | *newLVSize = simple_strtoull(resize, &resize, 0); |
269 | break; |
270 | } |
271 | case Opt_resize_nosize: |
272 | { |
273 | *newLVSize = sb->s_bdev->bd_inode->i_size >> |
274 | sb->s_blocksize_bits; |
275 | if (*newLVSize == 0) |
276 | printk(KERN_ERR |
277 | "JFS: Cannot determine volume size\n"); |
278 | break; |
279 | } |
280 | case Opt_errors: |
281 | { |
282 | char *errors = args[0].from; |
283 | if (!errors || !*errors) |
284 | goto cleanup; |
285 | if (!strcmp(errors, "continue")) { |
286 | *flag &= ~JFS_ERR_REMOUNT_RO; |
287 | *flag &= ~JFS_ERR_PANIC; |
288 | *flag |= JFS_ERR_CONTINUE; |
289 | } else if (!strcmp(errors, "remount-ro")) { |
290 | *flag &= ~JFS_ERR_CONTINUE; |
291 | *flag &= ~JFS_ERR_PANIC; |
292 | *flag |= JFS_ERR_REMOUNT_RO; |
293 | } else if (!strcmp(errors, "panic")) { |
294 | *flag &= ~JFS_ERR_CONTINUE; |
295 | *flag &= ~JFS_ERR_REMOUNT_RO; |
296 | *flag |= JFS_ERR_PANIC; |
297 | } else { |
298 | printk(KERN_ERR |
299 | "JFS: %s is an invalid error handler\n", |
300 | errors); |
301 | goto cleanup; |
302 | } |
303 | break; |
304 | } |
305 | |
306 | #ifdef CONFIG_QUOTA |
307 | case Opt_quota: |
308 | case Opt_usrquota: |
309 | *flag |= JFS_USRQUOTA; |
310 | break; |
311 | case Opt_grpquota: |
312 | *flag |= JFS_GRPQUOTA; |
313 | break; |
314 | #else |
315 | case Opt_usrquota: |
316 | case Opt_grpquota: |
317 | case Opt_quota: |
318 | printk(KERN_ERR |
319 | "JFS: quota operations not supported\n"); |
320 | break; |
321 | #endif |
322 | case Opt_uid: |
323 | { |
324 | char *uid = args[0].from; |
325 | sbi->uid = simple_strtoul(uid, &uid, 0); |
326 | break; |
327 | } |
328 | case Opt_gid: |
329 | { |
330 | char *gid = args[0].from; |
331 | sbi->gid = simple_strtoul(gid, &gid, 0); |
332 | break; |
333 | } |
334 | case Opt_umask: |
335 | { |
336 | char *umask = args[0].from; |
337 | sbi->umask = simple_strtoul(umask, &umask, 8); |
338 | if (sbi->umask & ~0777) { |
339 | printk(KERN_ERR |
340 | "JFS: Invalid value of umask\n"); |
341 | goto cleanup; |
342 | } |
343 | break; |
344 | } |
345 | default: |
346 | printk("jfs: Unrecognized mount option \"%s\" " |
347 | " or missing value\n", p); |
348 | goto cleanup; |
349 | } |
350 | } |
351 | |
352 | if (nls_map != (void *) -1) { |
353 | /* Discard old (if remount) */ |
354 | unload_nls(sbi->nls_tab); |
355 | sbi->nls_tab = nls_map; |
356 | } |
357 | return 1; |
358 | |
359 | cleanup: |
360 | if (nls_map && nls_map != (void *) -1) |
361 | unload_nls(nls_map); |
362 | return 0; |
363 | } |
364 | |
365 | static int jfs_remount(struct super_block *sb, int *flags, char *data) |
366 | { |
367 | s64 newLVSize = 0; |
368 | int rc = 0; |
369 | int flag = JFS_SBI(sb)->flag; |
370 | int ret; |
371 | |
372 | if (!parse_options(data, sb, &newLVSize, &flag)) { |
373 | return -EINVAL; |
374 | } |
375 | |
376 | if (newLVSize) { |
377 | if (sb->s_flags & MS_RDONLY) { |
378 | printk(KERN_ERR |
379 | "JFS: resize requires volume to be mounted read-write\n"); |
380 | return -EROFS; |
381 | } |
382 | rc = jfs_extendfs(sb, newLVSize, 0); |
383 | if (rc) |
384 | return rc; |
385 | } |
386 | |
387 | if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { |
388 | /* |
389 | * Invalidate any previously read metadata. fsck may have |
390 | * changed the on-disk data since we mounted r/o |
391 | */ |
392 | truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); |
393 | |
394 | JFS_SBI(sb)->flag = flag; |
395 | ret = jfs_mount_rw(sb, 1); |
396 | |
397 | /* mark the fs r/w for quota activity */ |
398 | sb->s_flags &= ~MS_RDONLY; |
399 | |
400 | dquot_resume(sb, -1); |
401 | return ret; |
402 | } |
403 | if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { |
404 | rc = dquot_suspend(sb, -1); |
405 | if (rc < 0) { |
406 | return rc; |
407 | } |
408 | rc = jfs_umount_rw(sb); |
409 | JFS_SBI(sb)->flag = flag; |
410 | return rc; |
411 | } |
412 | if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) |
413 | if (!(sb->s_flags & MS_RDONLY)) { |
414 | rc = jfs_umount_rw(sb); |
415 | if (rc) |
416 | return rc; |
417 | |
418 | JFS_SBI(sb)->flag = flag; |
419 | ret = jfs_mount_rw(sb, 1); |
420 | return ret; |
421 | } |
422 | JFS_SBI(sb)->flag = flag; |
423 | |
424 | return 0; |
425 | } |
426 | |
427 | static int jfs_fill_super(struct super_block *sb, void *data, int silent) |
428 | { |
429 | struct jfs_sb_info *sbi; |
430 | struct inode *inode; |
431 | int rc; |
432 | s64 newLVSize = 0; |
433 | int flag, ret = -EINVAL; |
434 | |
435 | jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); |
436 | |
437 | if (!new_valid_dev(sb->s_bdev->bd_dev)) |
438 | return -EOVERFLOW; |
439 | |
440 | sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL); |
441 | if (!sbi) |
442 | return -ENOMEM; |
443 | |
444 | sb->s_fs_info = sbi; |
445 | sbi->sb = sb; |
446 | sbi->uid = sbi->gid = sbi->umask = -1; |
447 | |
448 | /* initialize the mount flag and determine the default error handler */ |
449 | flag = JFS_ERR_REMOUNT_RO; |
450 | |
451 | if (!parse_options((char *) data, sb, &newLVSize, &flag)) |
452 | goto out_kfree; |
453 | sbi->flag = flag; |
454 | |
455 | #ifdef CONFIG_JFS_POSIX_ACL |
456 | sb->s_flags |= MS_POSIXACL; |
457 | #endif |
458 | |
459 | if (newLVSize) { |
460 | printk(KERN_ERR "resize option for remount only\n"); |
461 | goto out_kfree; |
462 | } |
463 | |
464 | /* |
465 | * Initialize blocksize to 4K. |
466 | */ |
467 | sb_set_blocksize(sb, PSIZE); |
468 | |
469 | /* |
470 | * Set method vectors. |
471 | */ |
472 | sb->s_op = &jfs_super_operations; |
473 | sb->s_export_op = &jfs_export_operations; |
474 | #ifdef CONFIG_QUOTA |
475 | sb->dq_op = &dquot_operations; |
476 | sb->s_qcop = &dquot_quotactl_ops; |
477 | #endif |
478 | |
479 | /* |
480 | * Initialize direct-mapping inode/address-space |
481 | */ |
482 | inode = new_inode(sb); |
483 | if (inode == NULL) { |
484 | ret = -ENOMEM; |
485 | goto out_unload; |
486 | } |
487 | inode->i_ino = 0; |
488 | inode->i_nlink = 1; |
489 | inode->i_size = sb->s_bdev->bd_inode->i_size; |
490 | inode->i_mapping->a_ops = &jfs_metapage_aops; |
491 | insert_inode_hash(inode); |
492 | mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); |
493 | |
494 | sbi->direct_inode = inode; |
495 | |
496 | rc = jfs_mount(sb); |
497 | if (rc) { |
498 | if (!silent) { |
499 | jfs_err("jfs_mount failed w/return code = %d", rc); |
500 | } |
501 | goto out_mount_failed; |
502 | } |
503 | if (sb->s_flags & MS_RDONLY) |
504 | sbi->log = NULL; |
505 | else { |
506 | rc = jfs_mount_rw(sb, 0); |
507 | if (rc) { |
508 | if (!silent) { |
509 | jfs_err("jfs_mount_rw failed, return code = %d", |
510 | rc); |
511 | } |
512 | goto out_no_rw; |
513 | } |
514 | } |
515 | |
516 | sb->s_magic = JFS_SUPER_MAGIC; |
517 | |
518 | if (sbi->mntflag & JFS_OS2) |
519 | sb->s_d_op = &jfs_ci_dentry_operations; |
520 | |
521 | inode = jfs_iget(sb, ROOT_I); |
522 | if (IS_ERR(inode)) { |
523 | ret = PTR_ERR(inode); |
524 | goto out_no_rw; |
525 | } |
526 | sb->s_root = d_alloc_root(inode); |
527 | if (!sb->s_root) |
528 | goto out_no_root; |
529 | |
530 | /* logical blocks are represented by 40 bits in pxd_t, etc. */ |
531 | sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; |
532 | #if BITS_PER_LONG == 32 |
533 | /* |
534 | * Page cache is indexed by long. |
535 | * I would use MAX_LFS_FILESIZE, but it's only half as big |
536 | */ |
537 | sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes); |
538 | #endif |
539 | sb->s_time_gran = 1; |
540 | return 0; |
541 | |
542 | out_no_root: |
543 | jfs_err("jfs_read_super: get root dentry failed"); |
544 | iput(inode); |
545 | |
546 | out_no_rw: |
547 | rc = jfs_umount(sb); |
548 | if (rc) { |
549 | jfs_err("jfs_umount failed with return code %d", rc); |
550 | } |
551 | out_mount_failed: |
552 | filemap_write_and_wait(sbi->direct_inode->i_mapping); |
553 | truncate_inode_pages(sbi->direct_inode->i_mapping, 0); |
554 | make_bad_inode(sbi->direct_inode); |
555 | iput(sbi->direct_inode); |
556 | sbi->direct_inode = NULL; |
557 | out_unload: |
558 | if (sbi->nls_tab) |
559 | unload_nls(sbi->nls_tab); |
560 | out_kfree: |
561 | kfree(sbi); |
562 | return ret; |
563 | } |
564 | |
565 | static int jfs_freeze(struct super_block *sb) |
566 | { |
567 | struct jfs_sb_info *sbi = JFS_SBI(sb); |
568 | struct jfs_log *log = sbi->log; |
569 | |
570 | if (!(sb->s_flags & MS_RDONLY)) { |
571 | txQuiesce(sb); |
572 | lmLogShutdown(log); |
573 | updateSuper(sb, FM_CLEAN); |
574 | } |
575 | return 0; |
576 | } |
577 | |
578 | static int jfs_unfreeze(struct super_block *sb) |
579 | { |
580 | struct jfs_sb_info *sbi = JFS_SBI(sb); |
581 | struct jfs_log *log = sbi->log; |
582 | int rc = 0; |
583 | |
584 | if (!(sb->s_flags & MS_RDONLY)) { |
585 | updateSuper(sb, FM_MOUNT); |
586 | if ((rc = lmLogInit(log))) |
587 | jfs_err("jfs_unlock failed with return code %d", rc); |
588 | else |
589 | txResume(sb); |
590 | } |
591 | return 0; |
592 | } |
593 | |
594 | static struct dentry *jfs_do_mount(struct file_system_type *fs_type, |
595 | int flags, const char *dev_name, void *data) |
596 | { |
597 | return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super); |
598 | } |
599 | |
600 | static int jfs_sync_fs(struct super_block *sb, int wait) |
601 | { |
602 | struct jfs_log *log = JFS_SBI(sb)->log; |
603 | |
604 | /* log == NULL indicates read-only mount */ |
605 | if (log) { |
606 | jfs_flush_journal(log, wait); |
607 | jfs_syncpt(log, 0); |
608 | } |
609 | |
610 | return 0; |
611 | } |
612 | |
613 | static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
614 | { |
615 | struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb); |
616 | |
617 | if (sbi->uid != -1) |
618 | seq_printf(seq, ",uid=%d", sbi->uid); |
619 | if (sbi->gid != -1) |
620 | seq_printf(seq, ",gid=%d", sbi->gid); |
621 | if (sbi->umask != -1) |
622 | seq_printf(seq, ",umask=%03o", sbi->umask); |
623 | if (sbi->flag & JFS_NOINTEGRITY) |
624 | seq_puts(seq, ",nointegrity"); |
625 | if (sbi->nls_tab) |
626 | seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); |
627 | if (sbi->flag & JFS_ERR_CONTINUE) |
628 | seq_printf(seq, ",errors=continue"); |
629 | if (sbi->flag & JFS_ERR_PANIC) |
630 | seq_printf(seq, ",errors=panic"); |
631 | |
632 | #ifdef CONFIG_QUOTA |
633 | if (sbi->flag & JFS_USRQUOTA) |
634 | seq_puts(seq, ",usrquota"); |
635 | |
636 | if (sbi->flag & JFS_GRPQUOTA) |
637 | seq_puts(seq, ",grpquota"); |
638 | #endif |
639 | |
640 | return 0; |
641 | } |
642 | |
643 | #ifdef CONFIG_QUOTA |
644 | |
645 | /* Read data from quotafile - avoid pagecache and such because we cannot afford |
646 | * acquiring the locks... As quota files are never truncated and quota code |
647 | * itself serializes the operations (and no one else should touch the files) |
648 | * we don't have to be afraid of races */ |
649 | static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, |
650 | size_t len, loff_t off) |
651 | { |
652 | struct inode *inode = sb_dqopt(sb)->files[type]; |
653 | sector_t blk = off >> sb->s_blocksize_bits; |
654 | int err = 0; |
655 | int offset = off & (sb->s_blocksize - 1); |
656 | int tocopy; |
657 | size_t toread; |
658 | struct buffer_head tmp_bh; |
659 | struct buffer_head *bh; |
660 | loff_t i_size = i_size_read(inode); |
661 | |
662 | if (off > i_size) |
663 | return 0; |
664 | if (off+len > i_size) |
665 | len = i_size-off; |
666 | toread = len; |
667 | while (toread > 0) { |
668 | tocopy = sb->s_blocksize - offset < toread ? |
669 | sb->s_blocksize - offset : toread; |
670 | |
671 | tmp_bh.b_state = 0; |
672 | tmp_bh.b_size = 1 << inode->i_blkbits; |
673 | err = jfs_get_block(inode, blk, &tmp_bh, 0); |
674 | if (err) |
675 | return err; |
676 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ |
677 | memset(data, 0, tocopy); |
678 | else { |
679 | bh = sb_bread(sb, tmp_bh.b_blocknr); |
680 | if (!bh) |
681 | return -EIO; |
682 | memcpy(data, bh->b_data+offset, tocopy); |
683 | brelse(bh); |
684 | } |
685 | offset = 0; |
686 | toread -= tocopy; |
687 | data += tocopy; |
688 | blk++; |
689 | } |
690 | return len; |
691 | } |
692 | |
693 | /* Write to quotafile */ |
694 | static ssize_t jfs_quota_write(struct super_block *sb, int type, |
695 | const char *data, 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 towrite = len; |
703 | struct buffer_head tmp_bh; |
704 | struct buffer_head *bh; |
705 | |
706 | mutex_lock(&inode->i_mutex); |
707 | while (towrite > 0) { |
708 | tocopy = sb->s_blocksize - offset < towrite ? |
709 | sb->s_blocksize - offset : towrite; |
710 | |
711 | tmp_bh.b_state = 0; |
712 | tmp_bh.b_size = 1 << inode->i_blkbits; |
713 | err = jfs_get_block(inode, blk, &tmp_bh, 1); |
714 | if (err) |
715 | goto out; |
716 | if (offset || tocopy != sb->s_blocksize) |
717 | bh = sb_bread(sb, tmp_bh.b_blocknr); |
718 | else |
719 | bh = sb_getblk(sb, tmp_bh.b_blocknr); |
720 | if (!bh) { |
721 | err = -EIO; |
722 | goto out; |
723 | } |
724 | lock_buffer(bh); |
725 | memcpy(bh->b_data+offset, data, tocopy); |
726 | flush_dcache_page(bh->b_page); |
727 | set_buffer_uptodate(bh); |
728 | mark_buffer_dirty(bh); |
729 | unlock_buffer(bh); |
730 | brelse(bh); |
731 | offset = 0; |
732 | towrite -= tocopy; |
733 | data += tocopy; |
734 | blk++; |
735 | } |
736 | out: |
737 | if (len == towrite) { |
738 | mutex_unlock(&inode->i_mutex); |
739 | return err; |
740 | } |
741 | if (inode->i_size < off+len-towrite) |
742 | i_size_write(inode, off+len-towrite); |
743 | inode->i_version++; |
744 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
745 | mark_inode_dirty(inode); |
746 | mutex_unlock(&inode->i_mutex); |
747 | return len - towrite; |
748 | } |
749 | |
750 | #endif |
751 | |
752 | static const struct super_operations jfs_super_operations = { |
753 | .alloc_inode = jfs_alloc_inode, |
754 | .destroy_inode = jfs_destroy_inode, |
755 | .dirty_inode = jfs_dirty_inode, |
756 | .write_inode = jfs_write_inode, |
757 | .evict_inode = jfs_evict_inode, |
758 | .put_super = jfs_put_super, |
759 | .sync_fs = jfs_sync_fs, |
760 | .freeze_fs = jfs_freeze, |
761 | .unfreeze_fs = jfs_unfreeze, |
762 | .statfs = jfs_statfs, |
763 | .remount_fs = jfs_remount, |
764 | .show_options = jfs_show_options, |
765 | #ifdef CONFIG_QUOTA |
766 | .quota_read = jfs_quota_read, |
767 | .quota_write = jfs_quota_write, |
768 | #endif |
769 | }; |
770 | |
771 | static const struct export_operations jfs_export_operations = { |
772 | .fh_to_dentry = jfs_fh_to_dentry, |
773 | .fh_to_parent = jfs_fh_to_parent, |
774 | .get_parent = jfs_get_parent, |
775 | }; |
776 | |
777 | static struct file_system_type jfs_fs_type = { |
778 | .owner = THIS_MODULE, |
779 | .name = "jfs", |
780 | .mount = jfs_do_mount, |
781 | .kill_sb = kill_block_super, |
782 | .fs_flags = FS_REQUIRES_DEV, |
783 | }; |
784 | |
785 | static void init_once(void *foo) |
786 | { |
787 | struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; |
788 | |
789 | memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); |
790 | INIT_LIST_HEAD(&jfs_ip->anon_inode_list); |
791 | init_rwsem(&jfs_ip->rdwrlock); |
792 | mutex_init(&jfs_ip->commit_mutex); |
793 | init_rwsem(&jfs_ip->xattr_sem); |
794 | spin_lock_init(&jfs_ip->ag_lock); |
795 | jfs_ip->active_ag = -1; |
796 | inode_init_once(&jfs_ip->vfs_inode); |
797 | } |
798 | |
799 | static int __init init_jfs_fs(void) |
800 | { |
801 | int i; |
802 | int rc; |
803 | |
804 | jfs_inode_cachep = |
805 | kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, |
806 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
807 | init_once); |
808 | if (jfs_inode_cachep == NULL) |
809 | return -ENOMEM; |
810 | |
811 | /* |
812 | * Metapage initialization |
813 | */ |
814 | rc = metapage_init(); |
815 | if (rc) { |
816 | jfs_err("metapage_init failed w/rc = %d", rc); |
817 | goto free_slab; |
818 | } |
819 | |
820 | /* |
821 | * Transaction Manager initialization |
822 | */ |
823 | rc = txInit(); |
824 | if (rc) { |
825 | jfs_err("txInit failed w/rc = %d", rc); |
826 | goto free_metapage; |
827 | } |
828 | |
829 | /* |
830 | * I/O completion thread (endio) |
831 | */ |
832 | jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); |
833 | if (IS_ERR(jfsIOthread)) { |
834 | rc = PTR_ERR(jfsIOthread); |
835 | jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); |
836 | goto end_txmngr; |
837 | } |
838 | |
839 | if (commit_threads < 1) |
840 | commit_threads = num_online_cpus(); |
841 | if (commit_threads > MAX_COMMIT_THREADS) |
842 | commit_threads = MAX_COMMIT_THREADS; |
843 | |
844 | for (i = 0; i < commit_threads; i++) { |
845 | jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit"); |
846 | if (IS_ERR(jfsCommitThread[i])) { |
847 | rc = PTR_ERR(jfsCommitThread[i]); |
848 | jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); |
849 | commit_threads = i; |
850 | goto kill_committask; |
851 | } |
852 | } |
853 | |
854 | jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); |
855 | if (IS_ERR(jfsSyncThread)) { |
856 | rc = PTR_ERR(jfsSyncThread); |
857 | jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); |
858 | goto kill_committask; |
859 | } |
860 | |
861 | #ifdef PROC_FS_JFS |
862 | jfs_proc_init(); |
863 | #endif |
864 | |
865 | return register_filesystem(&jfs_fs_type); |
866 | |
867 | kill_committask: |
868 | for (i = 0; i < commit_threads; i++) |
869 | kthread_stop(jfsCommitThread[i]); |
870 | kthread_stop(jfsIOthread); |
871 | end_txmngr: |
872 | txExit(); |
873 | free_metapage: |
874 | metapage_exit(); |
875 | free_slab: |
876 | kmem_cache_destroy(jfs_inode_cachep); |
877 | return rc; |
878 | } |
879 | |
880 | static void __exit exit_jfs_fs(void) |
881 | { |
882 | int i; |
883 | |
884 | jfs_info("exit_jfs_fs called"); |
885 | |
886 | txExit(); |
887 | metapage_exit(); |
888 | |
889 | kthread_stop(jfsIOthread); |
890 | for (i = 0; i < commit_threads; i++) |
891 | kthread_stop(jfsCommitThread[i]); |
892 | kthread_stop(jfsSyncThread); |
893 | #ifdef PROC_FS_JFS |
894 | jfs_proc_clean(); |
895 | #endif |
896 | unregister_filesystem(&jfs_fs_type); |
897 | kmem_cache_destroy(jfs_inode_cachep); |
898 | } |
899 | |
900 | module_init(init_jfs_fs) |
901 | module_exit(exit_jfs_fs) |
902 |
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v2.6.34-rc5
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