[mirror_ubuntu-bionic-kernel.git] / fs / aufs / dbgaufs.c

/*
 * Copyright (C) 2005-2017 Junjiro R. Okajima
 *
 * This program, aufs is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * debugfs interface
 */

#include <linux/debugfs.h>
#include "aufs.h"

#ifndef CONFIG_SYSFS
#error DEBUG_FS depends upon SYSFS
#endif

static struct dentry *dbgaufs;
static const mode_t dbgaufs_mode = S_IRUSR | S_IRGRP | S_IROTH;

/* 20 is max digits length of ulong 64 */
struct dbgaufs_arg {
	int n;
	char a[20 * 4];
};

/*
 * common function for all XINO files
 */
static int dbgaufs_xi_release(struct inode *inode __maybe_unused,
			      struct file *file)
{
	kfree(file->private_data);
	return 0;
}

static int dbgaufs_xi_open(struct file *xf, struct file *file, int do_fcnt)
{
	int err;
	struct kstat st;
	struct dbgaufs_arg *p;

	err = -ENOMEM;
	p = kmalloc(sizeof(*p), GFP_NOFS);
	if (unlikely(!p))
		goto out;

	err = 0;
	p->n = 0;
	file->private_data = p;
	if (!xf)
		goto out;

	err = vfsub_getattr(&xf->f_path, &st);
	if (!err) {
		if (do_fcnt)
			p->n = snprintf
				(p->a, sizeof(p->a), "%ld, %llux%u %lld\n",
				 (long)file_count(xf), st.blocks, st.blksize,
				 (long long)st.size);
		else
			p->n = snprintf(p->a, sizeof(p->a), "%llux%u %lld\n",
					st.blocks, st.blksize,
					(long long)st.size);
		AuDebugOn(p->n >= sizeof(p->a));
	} else {
		p->n = snprintf(p->a, sizeof(p->a), "err %d\n", err);
		err = 0;
	}

out:
	return err;

}

static ssize_t dbgaufs_xi_read(struct file *file, char __user *buf,
			       size_t count, loff_t *ppos)
{
	struct dbgaufs_arg *p;

	p = file->private_data;
	return simple_read_from_buffer(buf, count, ppos, p->a, p->n);
}

/* ---------------------------------------------------------------------- */

struct dbgaufs_plink_arg {
	int n;
	char a[];
};

static int dbgaufs_plink_release(struct inode *inode __maybe_unused,
				 struct file *file)
{
	free_page((unsigned long)file->private_data);
	return 0;
}

static int dbgaufs_plink_open(struct inode *inode, struct file *file)
{
	int err, i, limit;
	unsigned long n, sum;
	struct dbgaufs_plink_arg *p;
	struct au_sbinfo *sbinfo;
	struct super_block *sb;
	struct hlist_bl_head *hbl;

	err = -ENOMEM;
	p = (void *)get_zeroed_page(GFP_NOFS);
	if (unlikely(!p))
		goto out;

	err = -EFBIG;
	sbinfo = inode->i_private;
	sb = sbinfo->si_sb;
	si_noflush_read_lock(sb);
	if (au_opt_test(au_mntflags(sb), PLINK)) {
		limit = PAGE_SIZE - sizeof(p->n);

		/* the number of buckets */
		n = snprintf(p->a + p->n, limit, "%d\n", AuPlink_NHASH);
		p->n += n;
		limit -= n;

		sum = 0;
		for (i = 0, hbl = sbinfo->si_plink; i < AuPlink_NHASH;
		     i++, hbl++) {
			n = au_hbl_count(hbl);
			sum += n;

			n = snprintf(p->a + p->n, limit, "%lu ", n);
			p->n += n;
			limit -= n;
			if (unlikely(limit <= 0))
				goto out_free;
		}
		p->a[p->n - 1] = '\n';

		/* the sum of plinks */
		n = snprintf(p->a + p->n, limit, "%lu\n", sum);
		p->n += n;
		limit -= n;
		if (unlikely(limit <= 0))
			goto out_free;
	} else {
#define str "1\n0\n0\n"
		p->n = sizeof(str) - 1;
		strcpy(p->a, str);
#undef str
	}
	si_read_unlock(sb);

	err = 0;
	file->private_data = p;
	goto out; /* success */

out_free:
	free_page((unsigned long)p);
out:
	return err;
}

static ssize_t dbgaufs_plink_read(struct file *file, char __user *buf,
				  size_t count, loff_t *ppos)
{
	struct dbgaufs_plink_arg *p;

	p = file->private_data;
	return simple_read_from_buffer(buf, count, ppos, p->a, p->n);
}

static const struct file_operations dbgaufs_plink_fop = {
	.owner		= THIS_MODULE,
	.open		= dbgaufs_plink_open,
	.release	= dbgaufs_plink_release,
	.read		= dbgaufs_plink_read
};

/* ---------------------------------------------------------------------- */

static int dbgaufs_xib_open(struct inode *inode, struct file *file)
{
	int err;
	struct au_sbinfo *sbinfo;
	struct super_block *sb;

	sbinfo = inode->i_private;
	sb = sbinfo->si_sb;
	si_noflush_read_lock(sb);
	err = dbgaufs_xi_open(sbinfo->si_xib, file, /*do_fcnt*/0);
	si_read_unlock(sb);
	return err;
}

static const struct file_operations dbgaufs_xib_fop = {
	.owner		= THIS_MODULE,
	.open		= dbgaufs_xib_open,
	.release	= dbgaufs_xi_release,
	.read		= dbgaufs_xi_read
};

/* ---------------------------------------------------------------------- */

#define DbgaufsXi_PREFIX "xi"

static int dbgaufs_xino_open(struct inode *inode, struct file *file)
{
	int err;
	long l;
	struct au_sbinfo *sbinfo;
	struct super_block *sb;
	struct file *xf;
	struct qstr *name;

	err = -ENOENT;
	xf = NULL;
	name = &file->f_path.dentry->d_name;
	if (unlikely(name->len < sizeof(DbgaufsXi_PREFIX)
		     || memcmp(name->name, DbgaufsXi_PREFIX,
			       sizeof(DbgaufsXi_PREFIX) - 1)))
		goto out;
	err = kstrtol(name->name + sizeof(DbgaufsXi_PREFIX) - 1, 10, &l);
	if (unlikely(err))
		goto out;

	sbinfo = inode->i_private;
	sb = sbinfo->si_sb;
	si_noflush_read_lock(sb);
	if (l <= au_sbbot(sb)) {
		xf = au_sbr(sb, (aufs_bindex_t)l)->br_xino.xi_file;
		err = dbgaufs_xi_open(xf, file, /*do_fcnt*/1);
	} else
		err = -ENOENT;
	si_read_unlock(sb);

out:
	return err;
}

static const struct file_operations dbgaufs_xino_fop = {
	.owner		= THIS_MODULE,
	.open		= dbgaufs_xino_open,
	.release	= dbgaufs_xi_release,
	.read		= dbgaufs_xi_read
};

void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex)
{
	aufs_bindex_t bbot;
	struct au_branch *br;
	struct au_xino_file *xi;

	if (!au_sbi(sb)->si_dbgaufs)
		return;

	bbot = au_sbbot(sb);
	for (; bindex <= bbot; bindex++) {
		br = au_sbr(sb, bindex);
		xi = &br->br_xino;
		/* debugfs acquires the parent i_mutex */
		lockdep_off();
		debugfs_remove(xi->xi_dbgaufs);
		lockdep_on();
		xi->xi_dbgaufs = NULL;
	}
}

void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex)
{
	struct au_sbinfo *sbinfo;
	struct dentry *parent;
	struct au_branch *br;
	struct au_xino_file *xi;
	aufs_bindex_t bbot;
	char name[sizeof(DbgaufsXi_PREFIX) + 5]; /* "xi" bindex NULL */

	sbinfo = au_sbi(sb);
	parent = sbinfo->si_dbgaufs;
	if (!parent)
		return;

	bbot = au_sbbot(sb);
	for (; bindex <= bbot; bindex++) {
		snprintf(name, sizeof(name), DbgaufsXi_PREFIX "%d", bindex);
		br = au_sbr(sb, bindex);
		xi = &br->br_xino;
		AuDebugOn(xi->xi_dbgaufs);
		/* debugfs acquires the parent i_mutex */
		lockdep_off();
		xi->xi_dbgaufs = debugfs_create_file(name, dbgaufs_mode, parent,
						     sbinfo, &dbgaufs_xino_fop);
		lockdep_on();
		/* ignore an error */
		if (unlikely(!xi->xi_dbgaufs))
			AuWarn1("failed %s under debugfs\n", name);
	}
}

/* ---------------------------------------------------------------------- */

#ifdef CONFIG_AUFS_EXPORT
static int dbgaufs_xigen_open(struct inode *inode, struct file *file)
{
	int err;
	struct au_sbinfo *sbinfo;
	struct super_block *sb;

	sbinfo = inode->i_private;
	sb = sbinfo->si_sb;
	si_noflush_read_lock(sb);
	err = dbgaufs_xi_open(sbinfo->si_xigen, file, /*do_fcnt*/0);
	si_read_unlock(sb);
	return err;
}

static const struct file_operations dbgaufs_xigen_fop = {
	.owner		= THIS_MODULE,
	.open		= dbgaufs_xigen_open,
	.release	= dbgaufs_xi_release,
	.read		= dbgaufs_xi_read
};

static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo)
{
	int err;

	/*
	 * This function is a dynamic '__init' function actually,
	 * so the tiny check for si_rwsem is unnecessary.
	 */
	/* AuRwMustWriteLock(&sbinfo->si_rwsem); */

	err = -EIO;
	sbinfo->si_dbgaufs_xigen = debugfs_create_file
		("xigen", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
		 &dbgaufs_xigen_fop);
	if (sbinfo->si_dbgaufs_xigen)
		err = 0;

	return err;
}
#else
static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo)
{
	return 0;
}
#endif /* CONFIG_AUFS_EXPORT */

/* ---------------------------------------------------------------------- */

void dbgaufs_si_fin(struct au_sbinfo *sbinfo)
{
	/*
	 * This function is a dynamic '__fin' function actually,
	 * so the tiny check for si_rwsem is unnecessary.
	 */
	/* AuRwMustWriteLock(&sbinfo->si_rwsem); */

	debugfs_remove_recursive(sbinfo->si_dbgaufs);
	sbinfo->si_dbgaufs = NULL;
	kobject_put(&sbinfo->si_kobj);
}

int dbgaufs_si_init(struct au_sbinfo *sbinfo)
{
	int err;
	char name[SysaufsSiNameLen];

	/*
	 * This function is a dynamic '__init' function actually,
	 * so the tiny check for si_rwsem is unnecessary.
	 */
	/* AuRwMustWriteLock(&sbinfo->si_rwsem); */

	err = -ENOENT;
	if (!dbgaufs) {
		AuErr1("/debug/aufs is uninitialized\n");
		goto out;
	}

	err = -EIO;
	sysaufs_name(sbinfo, name);
	sbinfo->si_dbgaufs = debugfs_create_dir(name, dbgaufs);
	if (unlikely(!sbinfo->si_dbgaufs))
		goto out;
	kobject_get(&sbinfo->si_kobj);

	sbinfo->si_dbgaufs_xib = debugfs_create_file
		("xib", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
		 &dbgaufs_xib_fop);
	if (unlikely(!sbinfo->si_dbgaufs_xib))
		goto out_dir;

	sbinfo->si_dbgaufs_plink = debugfs_create_file
		("plink", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
		 &dbgaufs_plink_fop);
	if (unlikely(!sbinfo->si_dbgaufs_plink))
		goto out_dir;

	err = dbgaufs_xigen_init(sbinfo);
	if (!err)
		goto out; /* success */

out_dir:
	dbgaufs_si_fin(sbinfo);
out:
	return err;
}

/* ---------------------------------------------------------------------- */

void dbgaufs_fin(void)
{
	debugfs_remove(dbgaufs);
}

int __init dbgaufs_init(void)
{
	int err;

	err = -EIO;
	dbgaufs = debugfs_create_dir(AUFS_NAME, NULL);
	if (dbgaufs)
		err = 0;
	return err;
}
Commit	Line	Data
0006ebb4 SF	1	/*
	2	* Copyright (C) 2005-2017 Junjiro R. Okajima
	3	*
	4	* This program, aufs is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	16	*/
	17
	18	/*
	19	* debugfs interface
	20	*/
	21
	22	#include <linux/debugfs.h>
	23	#include "aufs.h"
	24
	25	#ifndef CONFIG_SYSFS
	26	#error DEBUG_FS depends upon SYSFS
	27	#endif
	28
	29	static struct dentry *dbgaufs;
	30	static const mode_t dbgaufs_mode = S_IRUSR \| S_IRGRP \| S_IROTH;
	31
	32	/* 20 is max digits length of ulong 64 */
	33	struct dbgaufs_arg {
	34	int n;
	35	char a[20 * 4];
	36	};
	37
	38	/*
	39	* common function for all XINO files
	40	*/
	41	static int dbgaufs_xi_release(struct inode *inode __maybe_unused,
	42	struct file *file)
	43	{
	44	kfree(file->private_data);
	45	return 0;
	46	}
	47
	48	static int dbgaufs_xi_open(struct file xf, struct file file, int do_fcnt)
	49	{
	50	int err;
	51	struct kstat st;
	52	struct dbgaufs_arg *p;
	53
	54	err = -ENOMEM;
	55	p = kmalloc(sizeof(*p), GFP_NOFS);
	56	if (unlikely(!p))
	57	goto out;
	58
	59	err = 0;
	60	p->n = 0;
	61	file->private_data = p;
	62	if (!xf)
	63	goto out;
	64
65	err = vfsub_getattr(&xf->f_path, &st);
66	if (!err) {
67	if (do_fcnt)
68	p->n = snprintf
69	(p->a, sizeof(p->a), "%ld, %llux%u %lld\n",
70	(long)file_count(xf), st.blocks, st.blksize,
71	(long long)st.size);
72	else
73	p->n = snprintf(p->a, sizeof(p->a), "%llux%u %lld\n",
74	st.blocks, st.blksize,
75	(long long)st.size);
76	AuDebugOn(p->n >= sizeof(p->a));
77	} else {
78	p->n = snprintf(p->a, sizeof(p->a), "err %d\n", err);
79	err = 0;
80	}
81
82	out:
83	return err;
84
85	}
86
87	static ssize_t dbgaufs_xi_read(struct file file, char __user buf,
88	size_t count, loff_t *ppos)
89	{
90	struct dbgaufs_arg *p;
91
92	p = file->private_data;
93	return simple_read_from_buffer(buf, count, ppos, p->a, p->n);
94	}
95
96	/* ---------------------------------------------------------------------- */
97
98	struct dbgaufs_plink_arg {
99	int n;
100	char a[];
101	};
102
103	static int dbgaufs_plink_release(struct inode *inode __maybe_unused,
104	struct file *file)
105	{
106	free_page((unsigned long)file->private_data);
107	return 0;
108	}
109
110	static int dbgaufs_plink_open(struct inode inode, struct file file)
111	{
112	int err, i, limit;
113	unsigned long n, sum;
114	struct dbgaufs_plink_arg *p;
115	struct au_sbinfo *sbinfo;
116	struct super_block *sb;
117	struct hlist_bl_head *hbl;
118
119	err = -ENOMEM;
120	p = (void *)get_zeroed_page(GFP_NOFS);
121	if (unlikely(!p))
122	goto out;
123
124	err = -EFBIG;
125	sbinfo = inode->i_private;
126	sb = sbinfo->si_sb;
127	si_noflush_read_lock(sb);
128	if (au_opt_test(au_mntflags(sb), PLINK)) {
129	limit = PAGE_SIZE - sizeof(p->n);
130
131	/* the number of buckets */
132	n = snprintf(p->a + p->n, limit, "%d\n", AuPlink_NHASH);
133	p->n += n;
134	limit -= n;
135
136	sum = 0;
137	for (i = 0, hbl = sbinfo->si_plink; i < AuPlink_NHASH;
138	i++, hbl++) {
139	n = au_hbl_count(hbl);
140	sum += n;
141
142	n = snprintf(p->a + p->n, limit, "%lu ", n);
143	p->n += n;
144	limit -= n;
145	if (unlikely(limit <= 0))
146	goto out_free;
147	}
148	p->a[p->n - 1] = '\n';
149
150	/* the sum of plinks */
151	n = snprintf(p->a + p->n, limit, "%lu\n", sum);
152	p->n += n;
153	limit -= n;
154	if (unlikely(limit <= 0))
155	goto out_free;
156	} else {
157	#define str "1\n0\n0\n"
158	p->n = sizeof(str) - 1;
159	strcpy(p->a, str);
160	#undef str
161	}
162	si_read_unlock(sb);
163
164	err = 0;
165	file->private_data = p;
166	goto out; /* success */
167
168	out_free:
169	free_page((unsigned long)p);
170	out:
171	return err;
172	}
173
174	static ssize_t dbgaufs_plink_read(struct file file, char __user buf,
175	size_t count, loff_t *ppos)
176	{
177	struct dbgaufs_plink_arg *p;
178
179	p = file->private_data;
180	return simple_read_from_buffer(buf, count, ppos, p->a, p->n);
181	}
182
183	static const struct file_operations dbgaufs_plink_fop = {
184	.owner = THIS_MODULE,
185	.open = dbgaufs_plink_open,
186	.release = dbgaufs_plink_release,
187	.read = dbgaufs_plink_read
188	};
189
190	/* ---------------------------------------------------------------------- */
191
192	static int dbgaufs_xib_open(struct inode inode, struct file file)
193	{
194	int err;
195	struct au_sbinfo *sbinfo;
196	struct super_block *sb;
197
198	sbinfo = inode->i_private;
199	sb = sbinfo->si_sb;
200	si_noflush_read_lock(sb);
201	err = dbgaufs_xi_open(sbinfo->si_xib, file, /do_fcnt/0);
202	si_read_unlock(sb);
203	return err;
204	}
205
206	static const struct file_operations dbgaufs_xib_fop = {
207	.owner = THIS_MODULE,
208	.open = dbgaufs_xib_open,
209	.release = dbgaufs_xi_release,
210	.read = dbgaufs_xi_read
211	};
212
213	/* ---------------------------------------------------------------------- */
214
215	#define DbgaufsXi_PREFIX "xi"
216
217	static int dbgaufs_xino_open(struct inode inode, struct file file)
218	{
219	int err;
220	long l;
221	struct au_sbinfo *sbinfo;
222	struct super_block *sb;
223	struct file *xf;
224	struct qstr *name;
225
226	err = -ENOENT;
227	xf = NULL;
228	name = &file->f_path.dentry->d_name;
229	if (unlikely(name->len < sizeof(DbgaufsXi_PREFIX)
230	\|\| memcmp(name->name, DbgaufsXi_PREFIX,
231	sizeof(DbgaufsXi_PREFIX) - 1)))
232	goto out;
233	err = kstrtol(name->name + sizeof(DbgaufsXi_PREFIX) - 1, 10, &l);
234	if (unlikely(err))
235	goto out;
236
237	sbinfo = inode->i_private;
238	sb = sbinfo->si_sb;
239	si_noflush_read_lock(sb);
240	if (l <= au_sbbot(sb)) {
241	xf = au_sbr(sb, (aufs_bindex_t)l)->br_xino.xi_file;
242	err = dbgaufs_xi_open(xf, file, /do_fcnt/1);
243	} else
244	err = -ENOENT;
245	si_read_unlock(sb);
246
247	out:
248	return err;
249	}
250
251	static const struct file_operations dbgaufs_xino_fop = {
252	.owner = THIS_MODULE,
253	.open = dbgaufs_xino_open,
254	.release = dbgaufs_xi_release,
255	.read = dbgaufs_xi_read
256	};
257
258	void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex)
259	{
260	aufs_bindex_t bbot;
261	struct au_branch *br;
262	struct au_xino_file *xi;
263
264	if (!au_sbi(sb)->si_dbgaufs)
265	return;
266
267	bbot = au_sbbot(sb);
268	for (; bindex <= bbot; bindex++) {
269	br = au_sbr(sb, bindex);
270	xi = &br->br_xino;
271	/* debugfs acquires the parent i_mutex */
272	lockdep_off();
273	debugfs_remove(xi->xi_dbgaufs);
274	lockdep_on();
275	xi->xi_dbgaufs = NULL;
276	}
277	}
278
279	void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex)
280	{
281	struct au_sbinfo *sbinfo;
282	struct dentry *parent;
283	struct au_branch *br;
284	struct au_xino_file *xi;
285	aufs_bindex_t bbot;
286	char name[sizeof(DbgaufsXi_PREFIX) + 5]; /* "xi" bindex NULL */
287
288	sbinfo = au_sbi(sb);
289	parent = sbinfo->si_dbgaufs;
290	if (!parent)
291	return;
292
293	bbot = au_sbbot(sb);
294	for (; bindex <= bbot; bindex++) {
295	snprintf(name, sizeof(name), DbgaufsXi_PREFIX "%d", bindex);
296	br = au_sbr(sb, bindex);
297	xi = &br->br_xino;
298	AuDebugOn(xi->xi_dbgaufs);
299	/* debugfs acquires the parent i_mutex */
300	lockdep_off();
301	xi->xi_dbgaufs = debugfs_create_file(name, dbgaufs_mode, parent,
302	sbinfo, &dbgaufs_xino_fop);
303	lockdep_on();
304	/* ignore an error */
305	if (unlikely(!xi->xi_dbgaufs))
306	AuWarn1("failed %s under debugfs\n", name);
307	}
308	}
309
310	/* ---------------------------------------------------------------------- */
311
312	#ifdef CONFIG_AUFS_EXPORT
313	static int dbgaufs_xigen_open(struct inode inode, struct file file)
314	{
315	int err;
316	struct au_sbinfo *sbinfo;
317	struct super_block *sb;
318
319	sbinfo = inode->i_private;
320	sb = sbinfo->si_sb;
321	si_noflush_read_lock(sb);
322	err = dbgaufs_xi_open(sbinfo->si_xigen, file, /do_fcnt/0);
323	si_read_unlock(sb);
324	return err;
325	}
326
327	static const struct file_operations dbgaufs_xigen_fop = {
328	.owner = THIS_MODULE,
329	.open = dbgaufs_xigen_open,
330	.release = dbgaufs_xi_release,
331	.read = dbgaufs_xi_read
332	};
333
334	static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo)
335	{
336	int err;
337
338	/*
339	* This function is a dynamic '__init' function actually,
340	* so the tiny check for si_rwsem is unnecessary.
341	*/
342	/* AuRwMustWriteLock(&sbinfo->si_rwsem); */
343
344	err = -EIO;
345	sbinfo->si_dbgaufs_xigen = debugfs_create_file
346	("xigen", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
347	&dbgaufs_xigen_fop);
348	if (sbinfo->si_dbgaufs_xigen)
349	err = 0;
350
351	return err;
352	}
353	#else
354	static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo)
355	{
356	return 0;
357	}
358	#endif /* CONFIG_AUFS_EXPORT */
359
360	/* ---------------------------------------------------------------------- */
361
362	void dbgaufs_si_fin(struct au_sbinfo *sbinfo)
363	{
364	/*
365	* This function is a dynamic '__fin' function actually,
366	* so the tiny check for si_rwsem is unnecessary.
367	*/
368	/* AuRwMustWriteLock(&sbinfo->si_rwsem); */
369
370	debugfs_remove_recursive(sbinfo->si_dbgaufs);
371	sbinfo->si_dbgaufs = NULL;
372	kobject_put(&sbinfo->si_kobj);
373	}
374
375	int dbgaufs_si_init(struct au_sbinfo *sbinfo)
376	{
377	int err;
378	char name[SysaufsSiNameLen];
379
380	/*
381	* This function is a dynamic '__init' function actually,
382	* so the tiny check for si_rwsem is unnecessary.
383	*/
384	/* AuRwMustWriteLock(&sbinfo->si_rwsem); */
385
386	err = -ENOENT;
387	if (!dbgaufs) {
388	AuErr1("/debug/aufs is uninitialized\n");
389	goto out;
390	}
391
392	err = -EIO;
393	sysaufs_name(sbinfo, name);
394	sbinfo->si_dbgaufs = debugfs_create_dir(name, dbgaufs);
395	if (unlikely(!sbinfo->si_dbgaufs))
396	goto out;
397	kobject_get(&sbinfo->si_kobj);
398
399	sbinfo->si_dbgaufs_xib = debugfs_create_file
400	("xib", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
401	&dbgaufs_xib_fop);
402	if (unlikely(!sbinfo->si_dbgaufs_xib))
403	goto out_dir;
404
405	sbinfo->si_dbgaufs_plink = debugfs_create_file
406	("plink", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
407	&dbgaufs_plink_fop);
408	if (unlikely(!sbinfo->si_dbgaufs_plink))
409	goto out_dir;
410
411	err = dbgaufs_xigen_init(sbinfo);
412	if (!err)
413	goto out; /* success */
414
415	out_dir:
416	dbgaufs_si_fin(sbinfo);
417	out:
418	return err;
419	}
420
421	/* ---------------------------------------------------------------------- */
422
423	void dbgaufs_fin(void)
424	{
425	debugfs_remove(dbgaufs);
426	}
427
428	int __init dbgaufs_init(void)
429	{
430	int err;
431
432	err = -EIO;
433	dbgaufs = debugfs_create_dir(AUFS_NAME, NULL);
434	if (dbgaufs)
435	err = 0;
436	return err;
437	}