2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
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.
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.
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
21 #include <linux/config.h>
22 #include <linux/module.h>
23 #include <linux/parser.h>
24 #include <linux/completion.h>
25 #include <linux/vfs.h>
26 #include <linux/moduleparam.h>
27 #include <asm/uaccess.h>
29 #include "jfs_incore.h"
30 #include "jfs_filsys.h"
31 #include "jfs_metapage.h"
32 #include "jfs_superblock.h"
36 #include "jfs_debug.h"
38 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
39 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
40 MODULE_LICENSE("GPL");
42 static kmem_cache_t * jfs_inode_cachep;
44 static struct super_operations jfs_super_operations;
45 static struct export_operations jfs_export_operations;
46 static struct file_system_type jfs_fs_type;
48 #define MAX_COMMIT_THREADS 64
49 static int commit_threads = 0;
50 module_param(commit_threads, int, 0);
51 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
54 static pid_t jfsIOthread;
55 static pid_t jfsCommitThread[MAX_COMMIT_THREADS];
56 static pid_t jfsSyncThread;
57 DECLARE_COMPLETION(jfsIOwait);
59 #ifdef CONFIG_JFS_DEBUG
60 int jfsloglevel = JFS_LOGLEVEL_WARN;
61 module_param(jfsloglevel, int, 0644);
62 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
66 * External declarations
68 extern int jfs_mount(struct super_block *);
69 extern int jfs_mount_rw(struct super_block *, int);
70 extern int jfs_umount(struct super_block *);
71 extern int jfs_umount_rw(struct super_block *);
73 extern int jfsIOWait(void *);
74 extern int jfs_lazycommit(void *);
75 extern int jfs_sync(void *);
77 extern void jfs_read_inode(struct inode *inode);
78 extern void jfs_dirty_inode(struct inode *inode);
79 extern void jfs_delete_inode(struct inode *inode);
80 extern int jfs_write_inode(struct inode *inode, int wait);
82 extern struct dentry *jfs_get_parent(struct dentry *dentry);
83 extern int jfs_extendfs(struct super_block *, s64, int);
85 extern struct dentry_operations jfs_ci_dentry_operations;
87 #ifdef PROC_FS_JFS /* see jfs_debug.h */
88 extern void jfs_proc_init(void);
89 extern void jfs_proc_clean(void);
92 extern wait_queue_head_t jfs_IO_thread_wait;
93 extern wait_queue_head_t jfs_commit_thread_wait;
94 extern wait_queue_head_t jfs_sync_thread_wait;
96 static void jfs_handle_error(struct super_block *sb)
98 struct jfs_sb_info *sbi = JFS_SBI(sb);
100 if (sb->s_flags & MS_RDONLY)
103 updateSuper(sb, FM_DIRTY);
105 if (sbi->flag & JFS_ERR_PANIC)
106 panic("JFS (device %s): panic forced after error\n",
108 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
109 jfs_err("ERROR: (device %s): remounting filesystem "
112 sb->s_flags |= MS_RDONLY;
115 /* nothing is done for continue beyond marking the superblock dirty */
118 void jfs_error(struct super_block *sb, const char * function, ...)
120 static char error_buf[256];
123 va_start(args, function);
124 vsprintf(error_buf, function, args);
127 printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
129 jfs_handle_error(sb);
132 static struct inode *jfs_alloc_inode(struct super_block *sb)
134 struct jfs_inode_info *jfs_inode;
136 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
139 return &jfs_inode->vfs_inode;
142 static void jfs_destroy_inode(struct inode *inode)
144 struct jfs_inode_info *ji = JFS_IP(inode);
146 spin_lock_irq(&ji->ag_lock);
147 if (ji->active_ag != -1) {
148 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
149 atomic_dec(&bmap->db_active[ji->active_ag]);
152 spin_unlock_irq(&ji->ag_lock);
154 #ifdef CONFIG_JFS_POSIX_ACL
155 if (ji->i_acl != JFS_ACL_NOT_CACHED) {
156 posix_acl_release(ji->i_acl);
157 ji->i_acl = JFS_ACL_NOT_CACHED;
159 if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
160 posix_acl_release(ji->i_default_acl);
161 ji->i_default_acl = JFS_ACL_NOT_CACHED;
165 kmem_cache_free(jfs_inode_cachep, ji);
168 static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
170 struct jfs_sb_info *sbi = JFS_SBI(sb);
172 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
174 jfs_info("In jfs_statfs");
175 buf->f_type = JFS_SUPER_MAGIC;
176 buf->f_bsize = sbi->bsize;
177 buf->f_blocks = sbi->bmap->db_mapsize;
178 buf->f_bfree = sbi->bmap->db_nfree;
179 buf->f_bavail = sbi->bmap->db_nfree;
181 * If we really return the number of allocated & free inodes, some
182 * applications will fail because they won't see enough free inodes.
183 * We'll try to calculate some guess as to how may inodes we can
186 * buf->f_files = atomic_read(&imap->im_numinos);
187 * buf->f_ffree = atomic_read(&imap->im_numfree);
189 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
190 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
191 << L2INOSPEREXT), (s64) 0xffffffffLL);
192 buf->f_files = maxinodes;
193 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
194 atomic_read(&imap->im_numfree));
196 buf->f_namelen = JFS_NAME_MAX;
200 static void jfs_put_super(struct super_block *sb)
202 struct jfs_sb_info *sbi = JFS_SBI(sb);
205 jfs_info("In jfs_put_super");
208 jfs_err("jfs_umount failed with return code %d", rc);
210 unload_nls(sbi->nls_tab);
217 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
218 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err,
221 static match_table_t tokens = {
222 {Opt_integrity, "integrity"},
223 {Opt_nointegrity, "nointegrity"},
224 {Opt_iocharset, "iocharset=%s"},
225 {Opt_resize, "resize=%u"},
226 {Opt_resize_nosize, "resize"},
227 {Opt_errors, "errors=%s"},
228 {Opt_ignore, "noquota"},
229 {Opt_ignore, "quota"},
230 {Opt_ignore, "usrquota"},
231 {Opt_ignore, "grpquota"},
235 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
238 void *nls_map = NULL;
240 struct jfs_sb_info *sbi = JFS_SBI(sb);
247 while ((p = strsep(&options, ",")) != NULL) {
248 substring_t args[MAX_OPT_ARGS];
253 token = match_token(p, tokens, args);
256 *flag &= ~JFS_NOINTEGRITY;
258 case Opt_nointegrity:
259 *flag |= JFS_NOINTEGRITY;
262 /* Silently ignore the quota options */
263 /* Don't do anything ;-) */
266 if (nls_map) /* specified iocharset twice! */
268 nls_map = load_nls(args[0].from);
270 printk(KERN_ERR "JFS: charset not found\n");
276 char *resize = args[0].from;
277 *newLVSize = simple_strtoull(resize, &resize, 0);
280 case Opt_resize_nosize:
282 *newLVSize = sb->s_bdev->bd_inode->i_size >>
283 sb->s_blocksize_bits;
286 "JFS: Cannot determine volume size\n");
291 char *errors = args[0].from;
292 if (!errors || !*errors)
294 if (!strcmp(errors, "continue")) {
295 *flag &= ~JFS_ERR_REMOUNT_RO;
296 *flag &= ~JFS_ERR_PANIC;
297 *flag |= JFS_ERR_CONTINUE;
298 } else if (!strcmp(errors, "remount-ro")) {
299 *flag &= ~JFS_ERR_CONTINUE;
300 *flag &= ~JFS_ERR_PANIC;
301 *flag |= JFS_ERR_REMOUNT_RO;
302 } else if (!strcmp(errors, "panic")) {
303 *flag &= ~JFS_ERR_CONTINUE;
304 *flag &= ~JFS_ERR_REMOUNT_RO;
305 *flag |= JFS_ERR_PANIC;
308 "JFS: %s is an invalid error handler\n",
315 printk("jfs: Unrecognized mount option \"%s\" "
316 " or missing value\n", p);
322 /* Discard old (if remount) */
324 unload_nls(sbi->nls_tab);
325 sbi->nls_tab = nls_map;
335 static int jfs_remount(struct super_block *sb, int *flags, char *data)
339 int flag = JFS_SBI(sb)->flag;
341 if (!parse_options(data, sb, &newLVSize, &flag)) {
345 if (sb->s_flags & MS_RDONLY) {
347 "JFS: resize requires volume to be mounted read-write\n");
350 rc = jfs_extendfs(sb, newLVSize, 0);
355 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
356 JFS_SBI(sb)->flag = flag;
357 return jfs_mount_rw(sb, 1);
359 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
360 rc = jfs_umount_rw(sb);
361 JFS_SBI(sb)->flag = flag;
364 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
365 if (!(sb->s_flags & MS_RDONLY)) {
366 rc = jfs_umount_rw(sb);
369 JFS_SBI(sb)->flag = flag;
370 return jfs_mount_rw(sb, 1);
372 JFS_SBI(sb)->flag = flag;
377 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
379 struct jfs_sb_info *sbi;
385 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
387 if (!new_valid_dev(sb->s_bdev->bd_dev))
390 sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
393 memset(sbi, 0, sizeof (struct jfs_sb_info));
397 /* initialize the mount flag and determine the default error handler */
398 flag = JFS_ERR_REMOUNT_RO;
400 if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
406 #ifdef CONFIG_JFS_POSIX_ACL
407 sb->s_flags |= MS_POSIXACL;
411 printk(KERN_ERR "resize option for remount only\n");
416 * Initialize blocksize to 4K.
418 sb_set_blocksize(sb, PSIZE);
421 * Set method vectors.
423 sb->s_op = &jfs_super_operations;
424 sb->s_export_op = &jfs_export_operations;
429 jfs_err("jfs_mount failed w/return code = %d", rc);
433 if (sb->s_flags & MS_RDONLY)
436 rc = jfs_mount_rw(sb, 0);
439 jfs_err("jfs_mount_rw failed, return code = %d",
446 sb->s_magic = JFS_SUPER_MAGIC;
448 inode = iget(sb, ROOT_I);
449 if (!inode || is_bad_inode(inode))
451 sb->s_root = d_alloc_root(inode);
455 if (sbi->mntflag & JFS_OS2)
456 sb->s_root->d_op = &jfs_ci_dentry_operations;
458 /* logical blocks are represented by 40 bits in pxd_t, etc. */
459 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
460 #if BITS_PER_LONG == 32
462 * Page cache is indexed by long.
463 * I would use MAX_LFS_FILESIZE, but it's only half as big
465 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
471 jfs_err("jfs_read_super: get root inode failed");
478 jfs_err("jfs_umount failed with return code %d", rc);
482 unload_nls(sbi->nls_tab);
487 static void jfs_write_super_lockfs(struct super_block *sb)
489 struct jfs_sb_info *sbi = JFS_SBI(sb);
490 struct jfs_log *log = sbi->log;
492 if (!(sb->s_flags & MS_RDONLY)) {
495 updateSuper(sb, FM_CLEAN);
499 static void jfs_unlockfs(struct super_block *sb)
501 struct jfs_sb_info *sbi = JFS_SBI(sb);
502 struct jfs_log *log = sbi->log;
505 if (!(sb->s_flags & MS_RDONLY)) {
506 updateSuper(sb, FM_MOUNT);
507 if ((rc = lmLogInit(log)))
508 jfs_err("jfs_unlock failed with return code %d", rc);
514 static struct super_block *jfs_get_sb(struct file_system_type *fs_type,
515 int flags, const char *dev_name, void *data)
517 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
520 static int jfs_sync_fs(struct super_block *sb, int wait)
522 struct jfs_log *log = JFS_SBI(sb)->log;
524 /* log == NULL indicates read-only mount */
526 jfs_flush_journal(log, wait);
531 static struct super_operations jfs_super_operations = {
532 .alloc_inode = jfs_alloc_inode,
533 .destroy_inode = jfs_destroy_inode,
534 .read_inode = jfs_read_inode,
535 .dirty_inode = jfs_dirty_inode,
536 .write_inode = jfs_write_inode,
537 .delete_inode = jfs_delete_inode,
538 .put_super = jfs_put_super,
539 .sync_fs = jfs_sync_fs,
540 .write_super_lockfs = jfs_write_super_lockfs,
541 .unlockfs = jfs_unlockfs,
542 .statfs = jfs_statfs,
543 .remount_fs = jfs_remount,
546 static struct export_operations jfs_export_operations = {
547 .get_parent = jfs_get_parent,
550 static struct file_system_type jfs_fs_type = {
551 .owner = THIS_MODULE,
553 .get_sb = jfs_get_sb,
554 .kill_sb = kill_block_super,
555 .fs_flags = FS_REQUIRES_DEV,
558 extern int metapage_init(void);
559 extern int txInit(void);
560 extern void txExit(void);
561 extern void metapage_exit(void);
563 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
565 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
567 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
568 SLAB_CTOR_CONSTRUCTOR) {
569 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
570 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
571 init_rwsem(&jfs_ip->rdwrlock);
572 init_MUTEX(&jfs_ip->commit_sem);
573 init_rwsem(&jfs_ip->xattr_sem);
574 spin_lock_init(&jfs_ip->ag_lock);
575 jfs_ip->active_ag = -1;
576 #ifdef CONFIG_JFS_POSIX_ACL
577 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
578 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
580 inode_init_once(&jfs_ip->vfs_inode);
584 static int __init init_jfs_fs(void)
590 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
591 SLAB_RECLAIM_ACCOUNT, init_once, NULL);
592 if (jfs_inode_cachep == NULL)
596 * Metapage initialization
598 rc = metapage_init();
600 jfs_err("metapage_init failed w/rc = %d", rc);
605 * Transaction Manager initialization
609 jfs_err("txInit failed w/rc = %d", rc);
614 * I/O completion thread (endio)
616 jfsIOthread = kernel_thread(jfsIOWait, NULL, CLONE_KERNEL);
617 if (jfsIOthread < 0) {
618 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
621 wait_for_completion(&jfsIOwait); /* Wait until thread starts */
623 if (commit_threads < 1)
624 commit_threads = num_online_cpus();
625 else if (commit_threads > MAX_COMMIT_THREADS)
626 commit_threads = MAX_COMMIT_THREADS;
628 for (i = 0; i < commit_threads; i++) {
629 jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL,
631 if (jfsCommitThread[i] < 0) {
632 jfs_err("init_jfs_fs: fork failed w/rc = %d",
635 goto kill_committask;
637 /* Wait until thread starts */
638 wait_for_completion(&jfsIOwait);
641 jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL);
642 if (jfsSyncThread < 0) {
643 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
644 goto kill_committask;
646 wait_for_completion(&jfsIOwait); /* Wait until thread starts */
652 return register_filesystem(&jfs_fs_type);
655 jfs_stop_threads = 1;
656 wake_up_all(&jfs_commit_thread_wait);
657 for (i = 0; i < commit_threads; i++)
658 wait_for_completion(&jfsIOwait);
660 wake_up(&jfs_IO_thread_wait);
661 wait_for_completion(&jfsIOwait); /* Wait for thread exit */
667 kmem_cache_destroy(jfs_inode_cachep);
671 static void __exit exit_jfs_fs(void)
675 jfs_info("exit_jfs_fs called");
677 jfs_stop_threads = 1;
680 wake_up(&jfs_IO_thread_wait);
681 wait_for_completion(&jfsIOwait); /* Wait until IO thread exits */
682 wake_up_all(&jfs_commit_thread_wait);
683 for (i = 0; i < commit_threads; i++)
684 wait_for_completion(&jfsIOwait);
685 wake_up(&jfs_sync_thread_wait);
686 wait_for_completion(&jfsIOwait); /* Wait until Sync thread exits */
690 unregister_filesystem(&jfs_fs_type);
691 kmem_cache_destroy(jfs_inode_cachep);
694 module_init(init_jfs_fs)
695 module_exit(exit_jfs_fs)