[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / minix / dir.c

/*
 *  linux/fs/minix/dir.c
 *
 *  Copyright (C) 1991, 1992 Linus Torvalds
 *
 *  minix directory handling functions
 */

#include "minix.h"
#include <linux/highmem.h>
#include <linux/smp_lock.h>

typedef struct minix_dir_entry minix_dirent;

static int minix_readdir(struct file *, void *, filldir_t);

const struct file_operations minix_dir_operations = {
	.read		= generic_read_dir,
	.readdir	= minix_readdir,
	.fsync		= minix_sync_file,
};

static inline void dir_put_page(struct page *page)
{
	kunmap(page);
	page_cache_release(page);
}

/*
 * Return the offset into page `page_nr' of the last valid
 * byte in that page, plus one.
 */
static unsigned
minix_last_byte(struct inode *inode, unsigned long page_nr)
{
	unsigned last_byte = PAGE_CACHE_SIZE;

	if (page_nr == (inode->i_size >> PAGE_CACHE_SHIFT))
		last_byte = inode->i_size & (PAGE_CACHE_SIZE - 1);
	return last_byte;
}

static inline unsigned long dir_pages(struct inode *inode)
{
	return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
}

static int dir_commit_chunk(struct page *page, unsigned from, unsigned to)
{
	struct inode *dir = (struct inode *)page->mapping->host;
	int err = 0;
	page->mapping->a_ops->commit_write(NULL, page, from, to);
	if (IS_DIRSYNC(dir))
		err = write_one_page(page, 1);
	else
		unlock_page(page);
	return err;
}

static struct page * dir_get_page(struct inode *dir, unsigned long n)
{
	struct address_space *mapping = dir->i_mapping;
	struct page *page = read_cache_page(mapping, n,
				(filler_t*)mapping->a_ops->readpage, NULL);
	if (!IS_ERR(page)) {
		wait_on_page_locked(page);
		kmap(page);
		if (!PageUptodate(page))
			goto fail;
	}
	return page;

fail:
	dir_put_page(page);
	return ERR_PTR(-EIO);
}

static inline void *minix_next_entry(void *de, struct minix_sb_info *sbi)
{
	return (void*)((char*)de + sbi->s_dirsize);
}

static int minix_readdir(struct file * filp, void * dirent, filldir_t filldir)
{
	unsigned long pos = filp->f_pos;
	struct inode *inode = filp->f_dentry->d_inode;
	struct super_block *sb = inode->i_sb;
	unsigned offset = pos & ~PAGE_CACHE_MASK;
	unsigned long n = pos >> PAGE_CACHE_SHIFT;
	unsigned long npages = dir_pages(inode);
	struct minix_sb_info *sbi = minix_sb(sb);
	unsigned chunk_size = sbi->s_dirsize;

	lock_kernel();

	pos = (pos + chunk_size-1) & ~(chunk_size-1);
	if (pos >= inode->i_size)
		goto done;

	for ( ; n < npages; n++, offset = 0) {
		char *p, *kaddr, *limit;
		struct page *page = dir_get_page(inode, n);

		if (IS_ERR(page))
			continue;
		kaddr = (char *)page_address(page);
		p = kaddr+offset;
		limit = kaddr + minix_last_byte(inode, n) - chunk_size;
		for ( ; p <= limit ; p = minix_next_entry(p, sbi)) {
			minix_dirent *de = (minix_dirent *)p;
			if (de->inode) {
				int over;
				unsigned l = strnlen(de->name,sbi->s_namelen);

				offset = p - kaddr;
				over = filldir(dirent, de->name, l,
						(n<<PAGE_CACHE_SHIFT) | offset,
						de->inode, DT_UNKNOWN);
				if (over) {
					dir_put_page(page);
					goto done;
				}
			}
		}
		dir_put_page(page);
	}

done:
	filp->f_pos = (n << PAGE_CACHE_SHIFT) | offset;
	unlock_kernel();
	return 0;
}

static inline int namecompare(int len, int maxlen,
	const char * name, const char * buffer)
{
	if (len < maxlen && buffer[len])
		return 0;
	return !memcmp(name, buffer, len);
}

/*
 *	minix_find_entry()
 *
 * finds an entry in the specified directory with the wanted name. It
 * returns the cache buffer in which the entry was found, and the entry
 * itself (as a parameter - res_dir). It does NOT read the inode of the
 * entry - you'll have to do that yourself if you want to.
 */
minix_dirent *minix_find_entry(struct dentry *dentry, struct page **res_page)
{
	const char * name = dentry->d_name.name;
	int namelen = dentry->d_name.len;
	struct inode * dir = dentry->d_parent->d_inode;
	struct super_block * sb = dir->i_sb;
	struct minix_sb_info * sbi = minix_sb(sb);
	unsigned long n;
	unsigned long npages = dir_pages(dir);
	struct page *page = NULL;
	struct minix_dir_entry *de;

	*res_page = NULL;

	for (n = 0; n < npages; n++) {
		char *kaddr;
		page = dir_get_page(dir, n);
		if (IS_ERR(page))
			continue;

		kaddr = (char*)page_address(page);
		de = (struct minix_dir_entry *) kaddr;
		kaddr += minix_last_byte(dir, n) - sbi->s_dirsize;
		for ( ; (char *) de <= kaddr ; de = minix_next_entry(de,sbi)) {
			if (!de->inode)
				continue;
			if (namecompare(namelen,sbi->s_namelen,name,de->name))
				goto found;
		}
		dir_put_page(page);
	}
	return NULL;

found:
	*res_page = page;
	return de;
}

int minix_add_link(struct dentry *dentry, struct inode *inode)
{
	struct inode *dir = dentry->d_parent->d_inode;
	const char * name = dentry->d_name.name;
	int namelen = dentry->d_name.len;
	struct super_block * sb = dir->i_sb;
	struct minix_sb_info * sbi = minix_sb(sb);
	struct page *page = NULL;
	struct minix_dir_entry * de;
	unsigned long npages = dir_pages(dir);
	unsigned long n;
	char *kaddr;
	unsigned from, to;
	int err;

	/*
	 * We take care of directory expansion in the same loop
	 * This code plays outside i_size, so it locks the page
	 * to protect that region.
	 */
	for (n = 0; n <= npages; n++) {
		char *dir_end;

		page = dir_get_page(dir, n);
		err = PTR_ERR(page);
		if (IS_ERR(page))
			goto out;
		lock_page(page);
		kaddr = (char*)page_address(page);
		dir_end = kaddr + minix_last_byte(dir, n);
		de = (minix_dirent *)kaddr;
		kaddr += PAGE_CACHE_SIZE - sbi->s_dirsize;
		while ((char *)de <= kaddr) {
			if ((char *)de == dir_end) {
				/* We hit i_size */
				de->inode = 0;
				goto got_it;
			}
			if (!de->inode)
				goto got_it;
			err = -EEXIST;
			if (namecompare(namelen,sbi->s_namelen,name,de->name))
				goto out_unlock;
			de = minix_next_entry(de, sbi);
		}
		unlock_page(page);
		dir_put_page(page);
	}
	BUG();
	return -EINVAL;

got_it:
	from = (char*)de - (char*)page_address(page);
	to = from + sbi->s_dirsize;
	err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
	if (err)
		goto out_unlock;
	memcpy (de->name, name, namelen);
	memset (de->name + namelen, 0, sbi->s_dirsize - namelen - 2);
	de->inode = inode->i_ino;
	err = dir_commit_chunk(page, from, to);
	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
	mark_inode_dirty(dir);
out_put:
	dir_put_page(page);
out:
	return err;
out_unlock:
	unlock_page(page);
	goto out_put;
}

int minix_delete_entry(struct minix_dir_entry *de, struct page *page)
{
	struct address_space *mapping = page->mapping;
	struct inode *inode = (struct inode*)mapping->host;
	char *kaddr = page_address(page);
	unsigned from = (char*)de - kaddr;
	unsigned to = from + minix_sb(inode->i_sb)->s_dirsize;
	int err;

	lock_page(page);
	err = mapping->a_ops->prepare_write(NULL, page, from, to);
	if (err == 0) {
		de->inode = 0;
		err = dir_commit_chunk(page, from, to);
	} else {
		unlock_page(page);
	}
	dir_put_page(page);
	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
	mark_inode_dirty(inode);
	return err;
}

int minix_make_empty(struct inode *inode, struct inode *dir)
{
	struct address_space *mapping = inode->i_mapping;
	struct page *page = grab_cache_page(mapping, 0);
	struct minix_sb_info * sbi = minix_sb(inode->i_sb);
	struct minix_dir_entry * de;
	char *kaddr;
	int err;

	if (!page)
		return -ENOMEM;
	err = mapping->a_ops->prepare_write(NULL, page, 0, 2 * sbi->s_dirsize);
	if (err) {
		unlock_page(page);
		goto fail;
	}

	kaddr = kmap_atomic(page, KM_USER0);
	memset(kaddr, 0, PAGE_CACHE_SIZE);

	de = (struct minix_dir_entry *)kaddr;
	de->inode = inode->i_ino;
	strcpy(de->name,".");
	de = minix_next_entry(de, sbi);
	de->inode = dir->i_ino;
	strcpy(de->name,"..");
	kunmap_atomic(kaddr, KM_USER0);

	err = dir_commit_chunk(page, 0, 2 * sbi->s_dirsize);
fail:
	page_cache_release(page);
	return err;
}

/*
 * routine to check that the specified directory is empty (for rmdir)
 */
int minix_empty_dir(struct inode * inode)
{
	struct page *page = NULL;
	unsigned long i, npages = dir_pages(inode);
	struct minix_sb_info *sbi = minix_sb(inode->i_sb);

	for (i = 0; i < npages; i++) {
		char *kaddr;
		minix_dirent * de;
		page = dir_get_page(inode, i);

		if (IS_ERR(page))
			continue;

		kaddr = (char *)page_address(page);
		de = (minix_dirent *)kaddr;
		kaddr += minix_last_byte(inode, i) - sbi->s_dirsize;

		while ((char *)de <= kaddr) {
			if (de->inode != 0) {
				/* check for . and .. */
				if (de->name[0] != '.')
					goto not_empty;
				if (!de->name[1]) {
					if (de->inode != inode->i_ino)
						goto not_empty;
				} else if (de->name[1] != '.')
					goto not_empty;
				else if (de->name[2])
					goto not_empty;
			}
			de = minix_next_entry(de, sbi);
		}
		dir_put_page(page);
	}
	return 1;

not_empty:
	dir_put_page(page);
	return 0;
}

/* Releases the page */
void minix_set_link(struct minix_dir_entry *de, struct page *page,
	struct inode *inode)
{
	struct inode *dir = (struct inode*)page->mapping->host;
	struct minix_sb_info *sbi = minix_sb(dir->i_sb);
	unsigned from = (char *)de-(char*)page_address(page);
	unsigned to = from + sbi->s_dirsize;
	int err;

	lock_page(page);
	err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
	if (err == 0) {
		de->inode = inode->i_ino;
		err = dir_commit_chunk(page, from, to);
	} else {
		unlock_page(page);
	}
	dir_put_page(page);
	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
	mark_inode_dirty(dir);
}

struct minix_dir_entry * minix_dotdot (struct inode *dir, struct page **p)
{
	struct page *page = dir_get_page(dir, 0);
	struct minix_sb_info *sbi = minix_sb(dir->i_sb);
	struct minix_dir_entry *de = NULL;

	if (!IS_ERR(page)) {
		de = minix_next_entry(page_address(page), sbi);
		*p = page;
	}
	return de;
}

ino_t minix_inode_by_name(struct dentry *dentry)
{
	struct page *page;
	struct minix_dir_entry *de = minix_find_entry(dentry, &page);
	ino_t res = 0;

	if (de) {
		res = de->inode;
		dir_put_page(page);
	}
	return res;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/minix/dir.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*
	6	* minix directory handling functions
	7	*/
	8
	9	#include "minix.h"
	10	#include <linux/highmem.h>
	11	#include <linux/smp_lock.h>
	12
	13	typedef struct minix_dir_entry minix_dirent;
	14
	15	static int minix_readdir(struct file , void , filldir_t);
	16
4b6f5d20	17	const struct file_operations minix_dir_operations = {
1da177e4 LT	18	.read = generic_read_dir,
	19	.readdir = minix_readdir,
	20	.fsync = minix_sync_file,
	21	};
	22
	23	static inline void dir_put_page(struct page *page)
	24	{
	25	kunmap(page);
	26	page_cache_release(page);
	27	}
	28
	29	/*
	30	* Return the offset into page `page_nr' of the last valid
	31	* byte in that page, plus one.
	32	*/
	33	static unsigned
	34	minix_last_byte(struct inode *inode, unsigned long page_nr)
	35	{
	36	unsigned last_byte = PAGE_CACHE_SIZE;
	37
	38	if (page_nr == (inode->i_size >> PAGE_CACHE_SHIFT))
	39	last_byte = inode->i_size & (PAGE_CACHE_SIZE - 1);
	40	return last_byte;
	41	}
	42
	43	static inline unsigned long dir_pages(struct inode *inode)
	44	{
	45	return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
	46	}
	47
	48	static int dir_commit_chunk(struct page *page, unsigned from, unsigned to)
	49	{
	50	struct inode dir = (struct inode )page->mapping->host;
	51	int err = 0;
	52	page->mapping->a_ops->commit_write(NULL, page, from, to);
	53	if (IS_DIRSYNC(dir))
	54	err = write_one_page(page, 1);
	55	else
	56	unlock_page(page);
	57	return err;
	58	}
	59
	60	static struct page * dir_get_page(struct inode *dir, unsigned long n)
	61	{
	62	struct address_space *mapping = dir->i_mapping;
	63	struct page *page = read_cache_page(mapping, n,
	64	(filler_t*)mapping->a_ops->readpage, NULL);
	65	if (!IS_ERR(page)) {
	66	wait_on_page_locked(page);
	67	kmap(page);
	68	if (!PageUptodate(page))
	69	goto fail;
	70	}
	71	return page;
	72
	73	fail:
	74	dir_put_page(page);
	75	return ERR_PTR(-EIO);
	76	}
	77
	78	static inline void minix_next_entry(void de, struct minix_sb_info *sbi)
	79	{
	80	return (void)((char)de + sbi->s_dirsize);
	81	}
82
83	static int minix_readdir(struct file * filp, void * dirent, filldir_t filldir)
84	{
85	unsigned long pos = filp->f_pos;
86	struct inode *inode = filp->f_dentry->d_inode;
87	struct super_block *sb = inode->i_sb;
88	unsigned offset = pos & ~PAGE_CACHE_MASK;
89	unsigned long n = pos >> PAGE_CACHE_SHIFT;
90	unsigned long npages = dir_pages(inode);
91	struct minix_sb_info *sbi = minix_sb(sb);
92	unsigned chunk_size = sbi->s_dirsize;
93
94	lock_kernel();
95
96	pos = (pos + chunk_size-1) & ~(chunk_size-1);
97	if (pos >= inode->i_size)
98	goto done;
99
100	for ( ; n < npages; n++, offset = 0) {
101	char p, kaddr, *limit;
102	struct page *page = dir_get_page(inode, n);
103
104	if (IS_ERR(page))
105	continue;
106	kaddr = (char *)page_address(page);
107	p = kaddr+offset;
108	limit = kaddr + minix_last_byte(inode, n) - chunk_size;
109	for ( ; p <= limit ; p = minix_next_entry(p, sbi)) {
110	minix_dirent de = (minix_dirent )p;
111	if (de->inode) {
112	int over;
113	unsigned l = strnlen(de->name,sbi->s_namelen);
114
115	offset = p - kaddr;
116	over = filldir(dirent, de->name, l,
117	(n<<PAGE_CACHE_SHIFT) \| offset,
118	de->inode, DT_UNKNOWN);
119	if (over) {
120	dir_put_page(page);
121	goto done;
122	}
123	}
124	}
125	dir_put_page(page);
126	}
127
128	done:
129	filp->f_pos = (n << PAGE_CACHE_SHIFT) \| offset;
130	unlock_kernel();
131	return 0;
132	}
133
134	static inline int namecompare(int len, int maxlen,
135	const char * name, const char * buffer)
136	{
137	if (len < maxlen && buffer[len])
138	return 0;
139	return !memcmp(name, buffer, len);
140	}
141
142	/*
143	* minix_find_entry()
144	*
145	* finds an entry in the specified directory with the wanted name. It
146	* returns the cache buffer in which the entry was found, and the entry
147	* itself (as a parameter - res_dir). It does NOT read the inode of the
148	* entry - you'll have to do that yourself if you want to.
149	*/
150	minix_dirent minix_find_entry(struct dentry dentry, struct page **res_page)
151	{
152	const char * name = dentry->d_name.name;
153	int namelen = dentry->d_name.len;
154	struct inode * dir = dentry->d_parent->d_inode;
155	struct super_block * sb = dir->i_sb;
156	struct minix_sb_info * sbi = minix_sb(sb);
157	unsigned long n;
158	unsigned long npages = dir_pages(dir);
159	struct page *page = NULL;
160	struct minix_dir_entry *de;
161
162	*res_page = NULL;
163
164	for (n = 0; n < npages; n++) {
165	char *kaddr;
166	page = dir_get_page(dir, n);
167	if (IS_ERR(page))
168	continue;
169
170	kaddr = (char*)page_address(page);
171	de = (struct minix_dir_entry *) kaddr;
172	kaddr += minix_last_byte(dir, n) - sbi->s_dirsize;
173	for ( ; (char *) de <= kaddr ; de = minix_next_entry(de,sbi)) {
174	if (!de->inode)
175	continue;
176	if (namecompare(namelen,sbi->s_namelen,name,de->name))
177	goto found;
178	}
179	dir_put_page(page);
180	}
181	return NULL;
182
183	found:
184	*res_page = page;
185	return de;
186	}
187
188	int minix_add_link(struct dentry dentry, struct inode inode)
189	{
190	struct inode *dir = dentry->d_parent->d_inode;
191	const char * name = dentry->d_name.name;
192	int namelen = dentry->d_name.len;
193	struct super_block * sb = dir->i_sb;
194	struct minix_sb_info * sbi = minix_sb(sb);
195	struct page *page = NULL;
196	struct minix_dir_entry * de;
197	unsigned long npages = dir_pages(dir);
198	unsigned long n;
199	char *kaddr;
200	unsigned from, to;
201	int err;
202
203	/*
204	* We take care of directory expansion in the same loop
205	* This code plays outside i_size, so it locks the page
206	* to protect that region.
207	*/
208	for (n = 0; n <= npages; n++) {
209	char *dir_end;
210
211	page = dir_get_page(dir, n);
212	err = PTR_ERR(page);
213	if (IS_ERR(page))
214	goto out;
215	lock_page(page);
216	kaddr = (char*)page_address(page);
217	dir_end = kaddr + minix_last_byte(dir, n);
218	de = (minix_dirent *)kaddr;
219	kaddr += PAGE_CACHE_SIZE - sbi->s_dirsize;
220	while ((char *)de <= kaddr) {
221	if ((char *)de == dir_end) {
222	/* We hit i_size */
223	de->inode = 0;
224	goto got_it;
225	}
226	if (!de->inode)
227	goto got_it;
228	err = -EEXIST;
229	if (namecompare(namelen,sbi->s_namelen,name,de->name))
230	goto out_unlock;
231	de = minix_next_entry(de, sbi);
232	}
233	unlock_page(page);
234	dir_put_page(page);
235	}
236	BUG();
237	return -EINVAL;
238
239	got_it:
240	from = (char)de - (char)page_address(page);
241	to = from + sbi->s_dirsize;
242	err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
243	if (err)
244	goto out_unlock;
245	memcpy (de->name, name, namelen);
246	memset (de->name + namelen, 0, sbi->s_dirsize - namelen - 2);
247	de->inode = inode->i_ino;
248	err = dir_commit_chunk(page, from, to);
249	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
250	mark_inode_dirty(dir);
251	out_put:
252	dir_put_page(page);
253	out:
254	return err;
255	out_unlock:
256	unlock_page(page);
257	goto out_put;
258	}
259
260	int minix_delete_entry(struct minix_dir_entry de, struct page page)
261	{
262	struct address_space *mapping = page->mapping;
263	struct inode inode = (struct inode)mapping->host;
264	char *kaddr = page_address(page);
265	unsigned from = (char*)de - kaddr;
266	unsigned to = from + minix_sb(inode->i_sb)->s_dirsize;
267	int err;
268
269	lock_page(page);
270	err = mapping->a_ops->prepare_write(NULL, page, from, to);
271	if (err == 0) {
272	de->inode = 0;
273	err = dir_commit_chunk(page, from, to);
274	} else {
275	unlock_page(page);
276	}
277	dir_put_page(page);
278	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
279	mark_inode_dirty(inode);
280	return err;
281	}
282
283	int minix_make_empty(struct inode inode, struct inode dir)
284	{
285	struct address_space *mapping = inode->i_mapping;
286	struct page *page = grab_cache_page(mapping, 0);
287	struct minix_sb_info * sbi = minix_sb(inode->i_sb);
288	struct minix_dir_entry * de;
289	char *kaddr;
290	int err;
291
292	if (!page)
293	return -ENOMEM;
294	err = mapping->a_ops->prepare_write(NULL, page, 0, 2 * sbi->s_dirsize);
295	if (err) {
296	unlock_page(page);
297	goto fail;
298	}
299
300	kaddr = kmap_atomic(page, KM_USER0);
301	memset(kaddr, 0, PAGE_CACHE_SIZE);
302
303	de = (struct minix_dir_entry *)kaddr;
304	de->inode = inode->i_ino;
305	strcpy(de->name,".");
306	de = minix_next_entry(de, sbi);
307	de->inode = dir->i_ino;
308	strcpy(de->name,"..");
309	kunmap_atomic(kaddr, KM_USER0);
310
311	err = dir_commit_chunk(page, 0, 2 * sbi->s_dirsize);
312	fail:
313	page_cache_release(page);
314	return err;
315	}
316
317	/*
318	* routine to check that the specified directory is empty (for rmdir)
319	*/
320	int minix_empty_dir(struct inode * inode)
321	{
322	struct page *page = NULL;
323	unsigned long i, npages = dir_pages(inode);
324	struct minix_sb_info *sbi = minix_sb(inode->i_sb);
325
326	for (i = 0; i < npages; i++) {
327	char *kaddr;
328	minix_dirent * de;
329	page = dir_get_page(inode, i);
330
331	if (IS_ERR(page))
332	continue;
333
334	kaddr = (char *)page_address(page);
335	de = (minix_dirent *)kaddr;
336	kaddr += minix_last_byte(inode, i) - sbi->s_dirsize;
337
338	while ((char *)de <= kaddr) {
339	if (de->inode != 0) {
340	/* check for . and .. */
341	if (de->name[0] != '.')
342	goto not_empty;
343	if (!de->name[1]) {
344	if (de->inode != inode->i_ino)
345	goto not_empty;
346	} else if (de->name[1] != '.')
347	goto not_empty;
348	else if (de->name[2])
349	goto not_empty;
350	}
351	de = minix_next_entry(de, sbi);
352	}
353	dir_put_page(page);
354	}
355	return 1;
356
357	not_empty:
358	dir_put_page(page);
359	return 0;
360	}
361
362	/* Releases the page */
363	void minix_set_link(struct minix_dir_entry de, struct page page,
364	struct inode *inode)
365	{
366	struct inode dir = (struct inode)page->mapping->host;
367	struct minix_sb_info *sbi = minix_sb(dir->i_sb);
368	unsigned from = (char )de-(char)page_address(page);
369	unsigned to = from + sbi->s_dirsize;
370	int err;
371
372	lock_page(page);
373	err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
374	if (err == 0) {
375	de->inode = inode->i_ino;
376	err = dir_commit_chunk(page, from, to);
377	} else {
378	unlock_page(page);
379	}
380	dir_put_page(page);
381	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
382	mark_inode_dirty(dir);
383	}
384
385	struct minix_dir_entry * minix_dotdot (struct inode dir, struct page *p)
386	{
387	struct page *page = dir_get_page(dir, 0);
388	struct minix_sb_info *sbi = minix_sb(dir->i_sb);
389	struct minix_dir_entry *de = NULL;
390
391	if (!IS_ERR(page)) {
392	de = minix_next_entry(page_address(page), sbi);
393	*p = page;
394	}
395	return de;
396	}
397
398	ino_t minix_inode_by_name(struct dentry *dentry)
399	{
400	struct page *page;
401	struct minix_dir_entry *de = minix_find_entry(dentry, &page);
402	ino_t res = 0;
403
404	if (de) {
405	res = de->inode;
406	dir_put_page(page);
407	}
408	return res;
409	}