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 = (void *)-1; /* -1: no change; NULL: none */
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 && nls_map != (void *) -1)
268 if (!strcmp(args[0].from, "none"))
271 nls_map = load_nls(args[0].from);
274 "JFS: charset not found\n");
281 char *resize = args[0].from;
282 *newLVSize = simple_strtoull(resize, &resize, 0);
285 case Opt_resize_nosize:
287 *newLVSize = sb->s_bdev->bd_inode->i_size >>
288 sb->s_blocksize_bits;
291 "JFS: Cannot determine volume size\n");
296 char *errors = args[0].from;
297 if (!errors || !*errors)
299 if (!strcmp(errors, "continue")) {
300 *flag &= ~JFS_ERR_REMOUNT_RO;
301 *flag &= ~JFS_ERR_PANIC;
302 *flag |= JFS_ERR_CONTINUE;
303 } else if (!strcmp(errors, "remount-ro")) {
304 *flag &= ~JFS_ERR_CONTINUE;
305 *flag &= ~JFS_ERR_PANIC;
306 *flag |= JFS_ERR_REMOUNT_RO;
307 } else if (!strcmp(errors, "panic")) {
308 *flag &= ~JFS_ERR_CONTINUE;
309 *flag &= ~JFS_ERR_REMOUNT_RO;
310 *flag |= JFS_ERR_PANIC;
313 "JFS: %s is an invalid error handler\n",
320 printk("jfs: Unrecognized mount option \"%s\" "
321 " or missing value\n", p);
326 if (nls_map != (void *) -1) {
327 /* Discard old (if remount) */
329 unload_nls(sbi->nls_tab);
330 sbi->nls_tab = nls_map;
335 if (nls_map && nls_map != (void *) -1)
340 static int jfs_remount(struct super_block *sb, int *flags, char *data)
344 int flag = JFS_SBI(sb)->flag;
346 if (!parse_options(data, sb, &newLVSize, &flag)) {
350 if (sb->s_flags & MS_RDONLY) {
352 "JFS: resize requires volume to be mounted read-write\n");
355 rc = jfs_extendfs(sb, newLVSize, 0);
360 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
361 JFS_SBI(sb)->flag = flag;
362 return jfs_mount_rw(sb, 1);
364 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
365 rc = jfs_umount_rw(sb);
366 JFS_SBI(sb)->flag = flag;
369 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
370 if (!(sb->s_flags & MS_RDONLY)) {
371 rc = jfs_umount_rw(sb);
374 JFS_SBI(sb)->flag = flag;
375 return jfs_mount_rw(sb, 1);
377 JFS_SBI(sb)->flag = flag;
382 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
384 struct jfs_sb_info *sbi;
390 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
392 if (!new_valid_dev(sb->s_bdev->bd_dev))
395 sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
398 memset(sbi, 0, sizeof (struct jfs_sb_info));
402 /* initialize the mount flag and determine the default error handler */
403 flag = JFS_ERR_REMOUNT_RO;
405 if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
411 #ifdef CONFIG_JFS_POSIX_ACL
412 sb->s_flags |= MS_POSIXACL;
416 printk(KERN_ERR "resize option for remount only\n");
421 * Initialize blocksize to 4K.
423 sb_set_blocksize(sb, PSIZE);
426 * Set method vectors.
428 sb->s_op = &jfs_super_operations;
429 sb->s_export_op = &jfs_export_operations;
434 jfs_err("jfs_mount failed w/return code = %d", rc);
438 if (sb->s_flags & MS_RDONLY)
441 rc = jfs_mount_rw(sb, 0);
444 jfs_err("jfs_mount_rw failed, return code = %d",
451 sb->s_magic = JFS_SUPER_MAGIC;
453 inode = iget(sb, ROOT_I);
454 if (!inode || is_bad_inode(inode))
456 sb->s_root = d_alloc_root(inode);
460 if (sbi->mntflag & JFS_OS2)
461 sb->s_root->d_op = &jfs_ci_dentry_operations;
463 /* logical blocks are represented by 40 bits in pxd_t, etc. */
464 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
465 #if BITS_PER_LONG == 32
467 * Page cache is indexed by long.
468 * I would use MAX_LFS_FILESIZE, but it's only half as big
470 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
476 jfs_err("jfs_read_super: get root inode failed");
483 jfs_err("jfs_umount failed with return code %d", rc);
487 unload_nls(sbi->nls_tab);
492 static void jfs_write_super_lockfs(struct super_block *sb)
494 struct jfs_sb_info *sbi = JFS_SBI(sb);
495 struct jfs_log *log = sbi->log;
497 if (!(sb->s_flags & MS_RDONLY)) {
500 updateSuper(sb, FM_CLEAN);
504 static void jfs_unlockfs(struct super_block *sb)
506 struct jfs_sb_info *sbi = JFS_SBI(sb);
507 struct jfs_log *log = sbi->log;
510 if (!(sb->s_flags & MS_RDONLY)) {
511 updateSuper(sb, FM_MOUNT);
512 if ((rc = lmLogInit(log)))
513 jfs_err("jfs_unlock failed with return code %d", rc);
519 static struct super_block *jfs_get_sb(struct file_system_type *fs_type,
520 int flags, const char *dev_name, void *data)
522 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
525 static int jfs_sync_fs(struct super_block *sb, int wait)
527 struct jfs_log *log = JFS_SBI(sb)->log;
529 /* log == NULL indicates read-only mount */
531 jfs_flush_journal(log, wait);
536 static struct super_operations jfs_super_operations = {
537 .alloc_inode = jfs_alloc_inode,
538 .destroy_inode = jfs_destroy_inode,
539 .read_inode = jfs_read_inode,
540 .dirty_inode = jfs_dirty_inode,
541 .write_inode = jfs_write_inode,
542 .delete_inode = jfs_delete_inode,
543 .put_super = jfs_put_super,
544 .sync_fs = jfs_sync_fs,
545 .write_super_lockfs = jfs_write_super_lockfs,
546 .unlockfs = jfs_unlockfs,
547 .statfs = jfs_statfs,
548 .remount_fs = jfs_remount,
551 static struct export_operations jfs_export_operations = {
552 .get_parent = jfs_get_parent,
555 static struct file_system_type jfs_fs_type = {
556 .owner = THIS_MODULE,
558 .get_sb = jfs_get_sb,
559 .kill_sb = kill_block_super,
560 .fs_flags = FS_REQUIRES_DEV,
563 extern int metapage_init(void);
564 extern int txInit(void);
565 extern void txExit(void);
566 extern void metapage_exit(void);
568 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
570 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
572 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
573 SLAB_CTOR_CONSTRUCTOR) {
574 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
575 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
576 init_rwsem(&jfs_ip->rdwrlock);
577 init_MUTEX(&jfs_ip->commit_sem);
578 init_rwsem(&jfs_ip->xattr_sem);
579 spin_lock_init(&jfs_ip->ag_lock);
580 jfs_ip->active_ag = -1;
581 #ifdef CONFIG_JFS_POSIX_ACL
582 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
583 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
585 inode_init_once(&jfs_ip->vfs_inode);
589 static int __init init_jfs_fs(void)
595 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
596 SLAB_RECLAIM_ACCOUNT, init_once, NULL);
597 if (jfs_inode_cachep == NULL)
601 * Metapage initialization
603 rc = metapage_init();
605 jfs_err("metapage_init failed w/rc = %d", rc);
610 * Transaction Manager initialization
614 jfs_err("txInit failed w/rc = %d", rc);
619 * I/O completion thread (endio)
621 jfsIOthread = kernel_thread(jfsIOWait, NULL, CLONE_KERNEL);
622 if (jfsIOthread < 0) {
623 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
626 wait_for_completion(&jfsIOwait); /* Wait until thread starts */
628 if (commit_threads < 1)
629 commit_threads = num_online_cpus();
630 if (commit_threads > MAX_COMMIT_THREADS)
631 commit_threads = MAX_COMMIT_THREADS;
633 for (i = 0; i < commit_threads; i++) {
634 jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL,
636 if (jfsCommitThread[i] < 0) {
637 jfs_err("init_jfs_fs: fork failed w/rc = %d",
640 goto kill_committask;
642 /* Wait until thread starts */
643 wait_for_completion(&jfsIOwait);
646 jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL);
647 if (jfsSyncThread < 0) {
648 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
649 goto kill_committask;
651 wait_for_completion(&jfsIOwait); /* Wait until thread starts */
657 return register_filesystem(&jfs_fs_type);
660 jfs_stop_threads = 1;
661 wake_up_all(&jfs_commit_thread_wait);
662 for (i = 0; i < commit_threads; i++)
663 wait_for_completion(&jfsIOwait);
665 wake_up(&jfs_IO_thread_wait);
666 wait_for_completion(&jfsIOwait); /* Wait for thread exit */
672 kmem_cache_destroy(jfs_inode_cachep);
676 static void __exit exit_jfs_fs(void)
680 jfs_info("exit_jfs_fs called");
682 jfs_stop_threads = 1;
685 wake_up(&jfs_IO_thread_wait);
686 wait_for_completion(&jfsIOwait); /* Wait until IO thread exits */
687 wake_up_all(&jfs_commit_thread_wait);
688 for (i = 0; i < commit_threads; i++)
689 wait_for_completion(&jfsIOwait);
690 wake_up(&jfs_sync_thread_wait);
691 wait_for_completion(&jfsIOwait); /* Wait until Sync thread exits */
695 unregister_filesystem(&jfs_fs_type);
696 kmem_cache_destroy(jfs_inode_cachep);
699 module_init(init_jfs_fs)
700 module_exit(exit_jfs_fs)