procfs.c

linux 内核源代码

		   "j_mount_id: \t%lu\n"
		   "j_start: \t%lu\n"
		   "j_len: \t%lu\n"
		   "j_len_alloc: \t%lu\n"
		   "j_wcount: \t%i\n"
		   "j_bcount: \t%lu\n"
		   "j_first_unflushed_offset: \t%lu\n"
		   "j_last_flush_trans_id: \t%lu\n"
		   "j_trans_start_time: \t%li\n"
		   "j_list_bitmap_index: \t%i\n"
		   "j_must_wait: \t%i\n"
		   "j_next_full_flush: \t%i\n"
		   "j_next_async_flush: \t%i\n"
		   "j_cnode_used: \t%i\n" "j_cnode_free: \t%i\n" "\n"
		   /* reiserfs_proc_info_data_t.journal fields */
		   "in_journal: \t%12lu\n"
		   "in_journal_bitmap: \t%12lu\n"
		   "in_journal_reusable: \t%12lu\n"
		   "lock_journal: \t%12lu\n"
		   "lock_journal_wait: \t%12lu\n"
		   "journal_begin: \t%12lu\n"
		   "journal_relock_writers: \t%12lu\n"
		   "journal_relock_wcount: \t%12lu\n"
		   "mark_dirty: \t%12lu\n"
		   "mark_dirty_already: \t%12lu\n"
		   "mark_dirty_notjournal: \t%12lu\n"
		   "restore_prepared: \t%12lu\n"
		   "prepare: \t%12lu\n"
		   "prepare_retry: \t%12lu\n",
		   DJP(jp_journal_1st_block),
		   bdevname(SB_JOURNAL(sb)->j_dev_bd, b),
		   DJP(jp_journal_dev),
		   DJP(jp_journal_size),
		   DJP(jp_journal_trans_max),
		   DJP(jp_journal_magic),
		   DJP(jp_journal_max_batch),
		   SB_JOURNAL(sb)->j_max_commit_age,
		   DJP(jp_journal_max_trans_age),
		   JF(j_1st_reserved_block),
		   JF(j_state),
		   JF(j_trans_id),
		   JF(j_mount_id),
		   JF(j_start),
		   JF(j_len),
		   JF(j_len_alloc),
		   atomic_read(&r->s_journal->j_wcount),
		   JF(j_bcount),
		   JF(j_first_unflushed_offset),
		   JF(j_last_flush_trans_id),
		   JF(j_trans_start_time),
		   JF(j_list_bitmap_index),
		   JF(j_must_wait),
		   JF(j_next_full_flush),
		   JF(j_next_async_flush),
		   JF(j_cnode_used),
		   JF(j_cnode_free),
		   SFPJ(in_journal),
		   SFPJ(in_journal_bitmap),
		   SFPJ(in_journal_reusable),
		   SFPJ(lock_journal),
		   SFPJ(lock_journal_wait),
		   SFPJ(journal_being),
		   SFPJ(journal_relock_writers),
		   SFPJ(journal_relock_wcount),
		   SFPJ(mark_dirty),
		   SFPJ(mark_dirty_already),
		   SFPJ(mark_dirty_notjournal),
		   SFPJ(restore_prepared), SFPJ(prepare), SFPJ(prepare_retry)
	    );
	return 0;
}

/* iterator */
static int test_sb(struct super_block *sb, void *data)
{
	return data == sb;
}

static int set_sb(struct super_block *sb, void *data)
{
	return -ENOENT;
}

static void *r_start(struct seq_file *m, loff_t * pos)
{
	struct proc_dir_entry *de = m->private;
	struct super_block *s = de->parent->data;
	loff_t l = *pos;

	if (l)
		return NULL;

	if (IS_ERR(sget(&reiserfs_fs_type, test_sb, set_sb, s)))
		return NULL;

	up_write(&s->s_umount);
	return s;
}

static void *r_next(struct seq_file *m, void *v, loff_t * pos)
{
	++*pos;
	if (v)
		deactivate_super(v);
	return NULL;
}

static void r_stop(struct seq_file *m, void *v)
{
	if (v)
		deactivate_super(v);
}

static int r_show(struct seq_file *m, void *v)
{
	struct proc_dir_entry *de = m->private;
	int (*show) (struct seq_file *, struct super_block *) = de->data;
	return show(m, v);
}

static struct seq_operations r_ops = {
	.start = r_start,
	.next = r_next,
	.stop = r_stop,
	.show = r_show,
};

static int r_open(struct inode *inode, struct file *file)
{
	int ret = seq_open(file, &r_ops);

	if (!ret) {
		struct seq_file *m = file->private_data;
		m->private = PDE(inode);
	}
	return ret;
}

static const struct file_operations r_file_operations = {
	.open = r_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release,
};

static struct proc_dir_entry *proc_info_root = NULL;
static const char proc_info_root_name[] = "fs/reiserfs";

static void add_file(struct super_block *sb, char *name,
		     int (*func) (struct seq_file *, struct super_block *))
{
	struct proc_dir_entry *de;
	de = create_proc_entry(name, 0, REISERFS_SB(sb)->procdir);
	if (de) {
		de->data = func;
		de->proc_fops = &r_file_operations;
	}
}

int reiserfs_proc_info_init(struct super_block *sb)
{
	char b[BDEVNAME_SIZE];
	char *s;

	/* Some block devices use /'s */
	strlcpy(b, reiserfs_bdevname(sb), BDEVNAME_SIZE);
	s = strchr(b, '/');
	if (s)
		*s = '!';

	spin_lock_init(&__PINFO(sb).lock);
	REISERFS_SB(sb)->procdir = proc_mkdir(b, proc_info_root);
	if (REISERFS_SB(sb)->procdir) {
		REISERFS_SB(sb)->procdir->owner = THIS_MODULE;
		REISERFS_SB(sb)->procdir->data = sb;
		add_file(sb, "version", show_version);
		add_file(sb, "super", show_super);
		add_file(sb, "per-level", show_per_level);
		add_file(sb, "bitmap", show_bitmap);
		add_file(sb, "on-disk-super", show_on_disk_super);
		add_file(sb, "oidmap", show_oidmap);
		add_file(sb, "journal", show_journal);
		return 0;
	}
	reiserfs_warning(sb, "reiserfs: cannot create /proc/%s/%s",
			 proc_info_root_name, b);
	return 1;
}

int reiserfs_proc_info_done(struct super_block *sb)
{
	struct proc_dir_entry *de = REISERFS_SB(sb)->procdir;
	char b[BDEVNAME_SIZE];
	char *s;

	/* Some block devices use /'s */
	strlcpy(b, reiserfs_bdevname(sb), BDEVNAME_SIZE);
	s = strchr(b, '/');
	if (s)
		*s = '!';

	if (de) {
		remove_proc_entry("journal", de);
		remove_proc_entry("oidmap", de);
		remove_proc_entry("on-disk-super", de);
		remove_proc_entry("bitmap", de);
		remove_proc_entry("per-level", de);
		remove_proc_entry("super", de);
		remove_proc_entry("version", de);
	}
	spin_lock(&__PINFO(sb).lock);
	__PINFO(sb).exiting = 1;
	spin_unlock(&__PINFO(sb).lock);
	if (proc_info_root) {
		remove_proc_entry(b, proc_info_root);
		REISERFS_SB(sb)->procdir = NULL;
	}
	return 0;
}

struct proc_dir_entry *reiserfs_proc_register_global(char *name,
						     read_proc_t * func)
{
	return (proc_info_root) ? create_proc_read_entry(name, 0,
							 proc_info_root,
							 func, NULL) : NULL;
}

void reiserfs_proc_unregister_global(const char *name)
{
	remove_proc_entry(name, proc_info_root);
}

int reiserfs_proc_info_global_init(void)
{
	if (proc_info_root == NULL) {
		proc_info_root = proc_mkdir(proc_info_root_name, NULL);
		if (proc_info_root) {
			proc_info_root->owner = THIS_MODULE;
		} else {
			reiserfs_warning(NULL,
					 "reiserfs: cannot create /proc/%s",
					 proc_info_root_name);
			return 1;
		}
	}
	return 0;
}

int reiserfs_proc_info_global_done(void)
{
	if (proc_info_root != NULL) {
		proc_info_root = NULL;
		remove_proc_entry(proc_info_root_name, NULL);
	}
	return 0;
}

/* REISERFS_PROC_INFO */
#else

int reiserfs_proc_info_init(struct super_block *sb)
{
	return 0;
}
int reiserfs_proc_info_done(struct super_block *sb)
{
	return 0;
}

struct proc_dir_entry *reiserfs_proc_register_global(char *name,
						     read_proc_t * func)
{
	return NULL;
}

void reiserfs_proc_unregister_global(const char *name)
{;
}

int reiserfs_proc_info_global_init(void)
{
	return 0;
}
int reiserfs_proc_info_global_done(void)
{
	return 0;
}

int reiserfs_global_version_in_proc(char *buffer, char **start,
				    off_t offset,
				    int count, int *eof, void *data)
{
	return 0;
}

/* REISERFS_PROC_INFO */
#endif

/*
 * $Log: procfs.c,v $
 * Revision 1.1.8.2  2001/07/15 17:08:42  god
 *  . use get_super() in procfs.c
 *  . remove remove_save_link() from reiserfs_do_truncate()
 *
 * I accept terms and conditions stated in the Legal Agreement
 * (available at http://www.namesys.com/legalese.html)
 *
 * Revision 1.1.8.1  2001/07/11 16:48:50  god
 * proc info support
 *
 * I accept terms and conditions stated in the Legal Agreement
 * (available at http://www.namesys.com/legalese.html)
 *
 */

/* 
 * Make Linus happy.
 * Local variables:
 * c-indentation-style: "K&R"
 * mode-name: "LC"
 * c-basic-offset: 8
 * tab-width: 8
 * End:
 */