[linux.git] / fs / nilfs2 / dir.c

/*
 * dir.c - NILFS directory entry operations
 *
 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
 *
 * This program 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Modified for NILFS by Amagai Yoshiji <[email protected]>
 */
/*
 *  linux/fs/ext2/dir.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card ([email protected])
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/dir.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  ext2 directory handling functions
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller ([email protected]), 1995
 *
 * All code that works with directory layout had been switched to pagecache
 * and moved here. AV
 */

#include <linux/pagemap.h>
#include <linux/smp_lock.h>
#include "nilfs.h"
#include "page.h"

/*
 * nilfs uses block-sized chunks. Arguably, sector-sized ones would be
 * more robust, but we have what we have
 */
static inline unsigned nilfs_chunk_size(struct inode *inode)
{
	return inode->i_sb->s_blocksize;
}

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

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

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

	last_byte -= page_nr << PAGE_CACHE_SHIFT;
	if (last_byte > PAGE_CACHE_SIZE)
		last_byte = PAGE_CACHE_SIZE;
	return last_byte;
}

static int nilfs_prepare_chunk_uninterruptible(struct page *page,
					       struct address_space *mapping,
					       unsigned from, unsigned to)
{
	loff_t pos = page_offset(page) + from;
	return block_write_begin(NULL, mapping, pos, to - from,
				 AOP_FLAG_UNINTERRUPTIBLE, &page,
				 NULL, nilfs_get_block);
}

static int nilfs_prepare_chunk(struct page *page,
			       struct address_space *mapping,
			       unsigned from, unsigned to)
{
	loff_t pos = page_offset(page) + from;
	return block_write_begin(NULL, mapping, pos, to - from, 0, &page,
				 NULL, nilfs_get_block);
}

static int nilfs_commit_chunk(struct page *page,
			      struct address_space *mapping,
			      unsigned from, unsigned to)
{
	struct inode *dir = mapping->host;
	struct nilfs_sb_info *sbi = NILFS_SB(dir->i_sb);
	loff_t pos = page_offset(page) + from;
	unsigned len = to - from;
	unsigned nr_dirty, copied;
	int err;

	nr_dirty = nilfs_page_count_clean_buffers(page, from, to);
	copied = block_write_end(NULL, mapping, pos, len, len, page, NULL);
	if (pos + copied > dir->i_size) {
		i_size_write(dir, pos + copied);
		mark_inode_dirty(dir);
	}
	if (IS_DIRSYNC(dir))
		nilfs_set_transaction_flag(NILFS_TI_SYNC);
	err = nilfs_set_file_dirty(sbi, dir, nr_dirty);
	unlock_page(page);
	return err;
}

static void nilfs_check_page(struct page *page)
{
	struct inode *dir = page->mapping->host;
	struct super_block *sb = dir->i_sb;
	unsigned chunk_size = nilfs_chunk_size(dir);
	char *kaddr = page_address(page);
	unsigned offs, rec_len;
	unsigned limit = PAGE_CACHE_SIZE;
	struct nilfs_dir_entry *p;
	char *error;

	if ((dir->i_size >> PAGE_CACHE_SHIFT) == page->index) {
		limit = dir->i_size & ~PAGE_CACHE_MASK;
		if (limit & (chunk_size - 1))
			goto Ebadsize;
		if (!limit)
			goto out;
	}
	for (offs = 0; offs <= limit - NILFS_DIR_REC_LEN(1); offs += rec_len) {
		p = (struct nilfs_dir_entry *)(kaddr + offs);
		rec_len = le16_to_cpu(p->rec_len);

		if (rec_len < NILFS_DIR_REC_LEN(1))
			goto Eshort;
		if (rec_len & 3)
			goto Ealign;
		if (rec_len < NILFS_DIR_REC_LEN(p->name_len))
			goto Enamelen;
		if (((offs + rec_len - 1) ^ offs) & ~(chunk_size-1))
			goto Espan;
	}
	if (offs != limit)
		goto Eend;
out:
	SetPageChecked(page);
	return;

	/* Too bad, we had an error */

Ebadsize:
	nilfs_error(sb, "nilfs_check_page",
		    "size of directory #%lu is not a multiple of chunk size",
		    dir->i_ino
	);
	goto fail;
Eshort:
	error = "rec_len is smaller than minimal";
	goto bad_entry;
Ealign:
	error = "unaligned directory entry";
	goto bad_entry;
Enamelen:
	error = "rec_len is too small for name_len";
	goto bad_entry;
Espan:
	error = "directory entry across blocks";
bad_entry:
	nilfs_error(sb, "nilfs_check_page", "bad entry in directory #%lu: %s - "
		    "offset=%lu, inode=%lu, rec_len=%d, name_len=%d",
		    dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs,
		    (unsigned long) le64_to_cpu(p->inode),
		    rec_len, p->name_len);
	goto fail;
Eend:
	p = (struct nilfs_dir_entry *)(kaddr + offs);
	nilfs_error(sb, "nilfs_check_page",
		    "entry in directory #%lu spans the page boundary"
		    "offset=%lu, inode=%lu",
		    dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs,
		    (unsigned long) le64_to_cpu(p->inode));
fail:
	SetPageChecked(page);
	SetPageError(page);
}

static struct page *nilfs_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;
		if (!PageChecked(page))
			nilfs_check_page(page);
		if (PageError(page))
			goto fail;
	}
	return page;

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

/*
 * NOTE! unlike strncmp, nilfs_match returns 1 for success, 0 for failure.
 *
 * len <= NILFS_NAME_LEN and de != NULL are guaranteed by caller.
 */
static int
nilfs_match(int len, const char * const name, struct nilfs_dir_entry *de)
{
	if (len != de->name_len)
		return 0;
	if (!de->inode)
		return 0;
	return !memcmp(name, de->name, len);
}

/*
 * p is at least 6 bytes before the end of page
 */
static struct nilfs_dir_entry *nilfs_next_entry(struct nilfs_dir_entry *p)
{
	return (struct nilfs_dir_entry *)((char *)p + le16_to_cpu(p->rec_len));
}

static unsigned char
nilfs_filetype_table[NILFS_FT_MAX] = {
	[NILFS_FT_UNKNOWN]	= DT_UNKNOWN,
	[NILFS_FT_REG_FILE]	= DT_REG,
	[NILFS_FT_DIR]		= DT_DIR,
	[NILFS_FT_CHRDEV]	= DT_CHR,
	[NILFS_FT_BLKDEV]	= DT_BLK,
	[NILFS_FT_FIFO]		= DT_FIFO,
	[NILFS_FT_SOCK]		= DT_SOCK,
	[NILFS_FT_SYMLINK]	= DT_LNK,
};

#define S_SHIFT 12
static unsigned char
nilfs_type_by_mode[S_IFMT >> S_SHIFT] = {
	[S_IFREG >> S_SHIFT]	= NILFS_FT_REG_FILE,
	[S_IFDIR >> S_SHIFT]	= NILFS_FT_DIR,
	[S_IFCHR >> S_SHIFT]	= NILFS_FT_CHRDEV,
	[S_IFBLK >> S_SHIFT]	= NILFS_FT_BLKDEV,
	[S_IFIFO >> S_SHIFT]	= NILFS_FT_FIFO,
	[S_IFSOCK >> S_SHIFT]	= NILFS_FT_SOCK,
	[S_IFLNK >> S_SHIFT]	= NILFS_FT_SYMLINK,
};

static void nilfs_set_de_type(struct nilfs_dir_entry *de, struct inode *inode)
{
	mode_t mode = inode->i_mode;

	de->file_type = nilfs_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
}

static int nilfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
	loff_t pos = filp->f_pos;
	struct inode *inode = filp->f_dentry->d_inode;
	struct super_block *sb = inode->i_sb;
	unsigned int offset = pos & ~PAGE_CACHE_MASK;
	unsigned long n = pos >> PAGE_CACHE_SHIFT;
	unsigned long npages = dir_pages(inode);
/*	unsigned chunk_mask = ~(nilfs_chunk_size(inode)-1); */
	unsigned char *types = NULL;
	int ret;

	if (pos > inode->i_size - NILFS_DIR_REC_LEN(1))
		goto success;

	types = nilfs_filetype_table;

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

		if (IS_ERR(page)) {
			nilfs_error(sb, __func__, "bad page in #%lu",
				    inode->i_ino);
			filp->f_pos += PAGE_CACHE_SIZE - offset;
			ret = -EIO;
			goto done;
		}
		kaddr = page_address(page);
		de = (struct nilfs_dir_entry *)(kaddr + offset);
		limit = kaddr + nilfs_last_byte(inode, n) -
			NILFS_DIR_REC_LEN(1);
		for ( ; (char *)de <= limit; de = nilfs_next_entry(de)) {
			if (de->rec_len == 0) {
				nilfs_error(sb, __func__,
					    "zero-length directory entry");
				ret = -EIO;
				nilfs_put_page(page);
				goto done;
			}
			if (de->inode) {
				int over;
				unsigned char d_type = DT_UNKNOWN;

				if (types && de->file_type < NILFS_FT_MAX)
					d_type = types[de->file_type];

				offset = (char *)de - kaddr;
				over = filldir(dirent, de->name, de->name_len,
						(n<<PAGE_CACHE_SHIFT) | offset,
						le64_to_cpu(de->inode), d_type);
				if (over) {
					nilfs_put_page(page);
					goto success;
				}
			}
			filp->f_pos += le16_to_cpu(de->rec_len);
		}
		nilfs_put_page(page);
	}

success:
	ret = 0;
done:
	return ret;
}

/*
 *	nilfs_find_entry()
 *
 * finds an entry in the specified directory with the wanted name. It
 * returns the page in which the entry was found, and the entry itself
 * (as a parameter - res_dir). Page is returned mapped and unlocked.
 * Entry is guaranteed to be valid.
 */
struct nilfs_dir_entry *
nilfs_find_entry(struct inode *dir, struct dentry *dentry,
		 struct page **res_page)
{
	const char *name = dentry->d_name.name;
	int namelen = dentry->d_name.len;
	unsigned reclen = NILFS_DIR_REC_LEN(namelen);
	unsigned long start, n;
	unsigned long npages = dir_pages(dir);
	struct page *page = NULL;
	struct nilfs_inode_info *ei = NILFS_I(dir);
	struct nilfs_dir_entry *de;

	if (npages == 0)
		goto out;

	/* OFFSET_CACHE */
	*res_page = NULL;

	start = ei->i_dir_start_lookup;
	if (start >= npages)
		start = 0;
	n = start;
	do {
		char *kaddr;
		page = nilfs_get_page(dir, n);
		if (!IS_ERR(page)) {
			kaddr = page_address(page);
			de = (struct nilfs_dir_entry *)kaddr;
			kaddr += nilfs_last_byte(dir, n) - reclen;
			while ((char *) de <= kaddr) {
				if (de->rec_len == 0) {
					nilfs_error(dir->i_sb, __func__,
						"zero-length directory entry");
					nilfs_put_page(page);
					goto out;
				}
				if (nilfs_match(namelen, name, de))
					goto found;
				de = nilfs_next_entry(de);
			}
			nilfs_put_page(page);
		}
		if (++n >= npages)
			n = 0;
		/* next page is past the blocks we've got */
		if (unlikely(n > (dir->i_blocks >> (PAGE_CACHE_SHIFT - 9)))) {
			nilfs_error(dir->i_sb, __func__,
			       "dir %lu size %lld exceeds block cout %llu",
			       dir->i_ino, dir->i_size,
			       (unsigned long long)dir->i_blocks);
			goto out;
		}
	} while (n != start);
out:
	return NULL;

found:
	*res_page = page;
	ei->i_dir_start_lookup = n;
	return de;
}

struct nilfs_dir_entry *nilfs_dotdot(struct inode *dir, struct page **p)
{
	struct page *page = nilfs_get_page(dir, 0);
	struct nilfs_dir_entry *de = NULL;

	if (!IS_ERR(page)) {
		de = nilfs_next_entry(
			(struct nilfs_dir_entry *)page_address(page));
		*p = page;
	}
	return de;
}

ino_t nilfs_inode_by_name(struct inode *dir, struct dentry *dentry)
{
	ino_t res = 0;
	struct nilfs_dir_entry *de;
	struct page *page;

	de = nilfs_find_entry(dir, dentry, &page);
	if (de) {
		res = le64_to_cpu(de->inode);
		kunmap(page);
		page_cache_release(page);
	}
	return res;
}

/* Releases the page */
void nilfs_set_link(struct inode *dir, struct nilfs_dir_entry *de,
		    struct page *page, struct inode *inode)
{
	unsigned from = (char *) de - (char *) page_address(page);
	unsigned to = from + le16_to_cpu(de->rec_len);
	struct address_space *mapping = page->mapping;
	int err;

	lock_page(page);
	err = nilfs_prepare_chunk_uninterruptible(page, mapping, from, to);
	BUG_ON(err);
	de->inode = cpu_to_le64(inode->i_ino);
	nilfs_set_de_type(de, inode);
	err = nilfs_commit_chunk(page, mapping, from, to);
	nilfs_put_page(page);
	dir->i_mtime = dir->i_ctime = CURRENT_TIME;
/*	NILFS_I(dir)->i_flags &= ~NILFS_BTREE_FL; */
	mark_inode_dirty(dir);
}

/*
 *	Parent is locked.
 */
int nilfs_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;
	unsigned chunk_size = nilfs_chunk_size(dir);
	unsigned reclen = NILFS_DIR_REC_LEN(namelen);
	unsigned short rec_len, name_len;
	struct page *page = NULL;
	struct nilfs_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 = nilfs_get_page(dir, n);
		err = PTR_ERR(page);
		if (IS_ERR(page))
			goto out;
		lock_page(page);
		kaddr = page_address(page);
		dir_end = kaddr + nilfs_last_byte(dir, n);
		de = (struct nilfs_dir_entry *)kaddr;
		kaddr += PAGE_CACHE_SIZE - reclen;
		while ((char *)de <= kaddr) {
			if ((char *)de == dir_end) {
				/* We hit i_size */
				name_len = 0;
				rec_len = chunk_size;
				de->rec_len = cpu_to_le16(chunk_size);
				de->inode = 0;
				goto got_it;
			}
			if (de->rec_len == 0) {
				nilfs_error(dir->i_sb, __func__,
					    "zero-length directory entry");
				err = -EIO;
				goto out_unlock;
			}
			err = -EEXIST;
			if (nilfs_match(namelen, name, de))
				goto out_unlock;
			name_len = NILFS_DIR_REC_LEN(de->name_len);
			rec_len = le16_to_cpu(de->rec_len);
			if (!de->inode && rec_len >= reclen)
				goto got_it;
			if (rec_len >= name_len + reclen)
				goto got_it;
			de = (struct nilfs_dir_entry *)((char *)de + rec_len);
		}
		unlock_page(page);
		nilfs_put_page(page);
	}
	BUG();
	return -EINVAL;

got_it:
	from = (char *)de - (char *)page_address(page);
	to = from + rec_len;
	err = nilfs_prepare_chunk(page, page->mapping, from, to);
	if (err)
		goto out_unlock;
	if (de->inode) {
		struct nilfs_dir_entry *de1;

		de1 = (struct nilfs_dir_entry *)((char *)de + name_len);
		de1->rec_len = cpu_to_le16(rec_len - name_len);
		de->rec_len = cpu_to_le16(name_len);
		de = de1;
	}
	de->name_len = namelen;
	memcpy(de->name, name, namelen);
	de->inode = cpu_to_le64(inode->i_ino);
	nilfs_set_de_type(de, inode);
	err = nilfs_commit_chunk(page, page->mapping, from, to);
	dir->i_mtime = dir->i_ctime = CURRENT_TIME;
/*	NILFS_I(dir)->i_flags &= ~NILFS_BTREE_FL; */
	mark_inode_dirty(dir);
	/* OFFSET_CACHE */
out_put:
	nilfs_put_page(page);
out:
	return err;
out_unlock:
	unlock_page(page);
	goto out_put;
}

/*
 * nilfs_delete_entry deletes a directory entry by merging it with the
 * previous entry. Page is up-to-date. Releases the page.
 */
int nilfs_delete_entry(struct nilfs_dir_entry *dir, struct page *page)
{
	struct address_space *mapping = page->mapping;
	struct inode *inode = mapping->host;
	char *kaddr = page_address(page);
	unsigned from = ((char *)dir - kaddr) & ~(nilfs_chunk_size(inode) - 1);
	unsigned to = ((char *)dir - kaddr) + le16_to_cpu(dir->rec_len);
	struct nilfs_dir_entry *pde = NULL;
	struct nilfs_dir_entry *de = (struct nilfs_dir_entry *)(kaddr + from);
	int err;

	while ((char *)de < (char *)dir) {
		if (de->rec_len == 0) {
			nilfs_error(inode->i_sb, __func__,
				    "zero-length directory entry");
			err = -EIO;
			goto out;
		}
		pde = de;
		de = nilfs_next_entry(de);
	}
	if (pde)
		from = (char *)pde - (char *)page_address(page);
	lock_page(page);
	err = nilfs_prepare_chunk(page, mapping, from, to);
	BUG_ON(err);
	if (pde)
		pde->rec_len = cpu_to_le16(to - from);
	dir->inode = 0;
	err = nilfs_commit_chunk(page, mapping, from, to);
	inode->i_ctime = inode->i_mtime = CURRENT_TIME;
/*	NILFS_I(inode)->i_flags &= ~NILFS_BTREE_FL; */
	mark_inode_dirty(inode);
out:
	nilfs_put_page(page);
	return err;
}

/*
 * Set the first fragment of directory.
 */
int nilfs_make_empty(struct inode *inode, struct inode *parent)
{
	struct address_space *mapping = inode->i_mapping;
	struct page *page = grab_cache_page(mapping, 0);
	unsigned chunk_size = nilfs_chunk_size(inode);
	struct nilfs_dir_entry *de;
	int err;
	void *kaddr;

	if (!page)
		return -ENOMEM;

	err = nilfs_prepare_chunk(page, mapping, 0, chunk_size);
	if (unlikely(err)) {
		unlock_page(page);
		goto fail;
	}
	kaddr = kmap_atomic(page, KM_USER0);
	memset(kaddr, 0, chunk_size);
	de = (struct nilfs_dir_entry *)kaddr;
	de->name_len = 1;
	de->rec_len = cpu_to_le16(NILFS_DIR_REC_LEN(1));
	memcpy(de->name, ".\0\0", 4);
	de->inode = cpu_to_le64(inode->i_ino);
	nilfs_set_de_type(de, inode);

	de = (struct nilfs_dir_entry *)(kaddr + NILFS_DIR_REC_LEN(1));
	de->name_len = 2;
	de->rec_len = cpu_to_le16(chunk_size - NILFS_DIR_REC_LEN(1));
	de->inode = cpu_to_le64(parent->i_ino);
	memcpy(de->name, "..\0", 4);
	nilfs_set_de_type(de, inode);
	kunmap_atomic(kaddr, KM_USER0);
	err = nilfs_commit_chunk(page, mapping, 0, chunk_size);
fail:
	page_cache_release(page);
	return err;
}

/*
 * routine to check that the specified directory is empty (for rmdir)
 */
int nilfs_empty_dir(struct inode *inode)
{
	struct page *page = NULL;
	unsigned long i, npages = dir_pages(inode);

	for (i = 0; i < npages; i++) {
		char *kaddr;
		struct nilfs_dir_entry *de;

		page = nilfs_get_page(inode, i);
		if (IS_ERR(page))
			continue;

		kaddr = page_address(page);
		de = (struct nilfs_dir_entry *)kaddr;
		kaddr += nilfs_last_byte(inode, i) - NILFS_DIR_REC_LEN(1);

		while ((char *)de <= kaddr) {
			if (de->rec_len == 0) {
				nilfs_error(inode->i_sb, __func__,
					    "zero-length directory entry "
					    "(kaddr=%p, de=%p)\n", kaddr, de);
				goto not_empty;
			}
			if (de->inode != 0) {
				/* check for . and .. */
				if (de->name[0] != '.')
					goto not_empty;
				if (de->name_len > 2)
					goto not_empty;
				if (de->name_len < 2) {
					if (de->inode !=
					    cpu_to_le64(inode->i_ino))
						goto not_empty;
				} else if (de->name[1] != '.')
					goto not_empty;
			}
			de = nilfs_next_entry(de);
		}
		nilfs_put_page(page);
	}
	return 1;

not_empty:
	nilfs_put_page(page);
	return 0;
}

struct file_operations nilfs_dir_operations = {
	.llseek		= generic_file_llseek,
	.read		= generic_read_dir,
	.readdir	= nilfs_readdir,
	.unlocked_ioctl	= nilfs_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= nilfs_ioctl,
#endif	/* CONFIG_COMPAT */
	.fsync		= nilfs_sync_file,

};
Commit	Line	Data
2ba466d7 YA	1	/*
	2	* dir.c - NILFS directory entry operations
	3	*
	4	* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*
	20	* Modified for NILFS by Amagai Yoshiji <[email protected]>
	21	*/
	22	/*
	23	* linux/fs/ext2/dir.c
	24	*
	25	* Copyright (C) 1992, 1993, 1994, 1995
	26	* Remy Card ([email protected])
	27	* Laboratoire MASI - Institut Blaise Pascal
	28	* Universite Pierre et Marie Curie (Paris VI)
	29	*
	30	* from
	31	*
	32	* linux/fs/minix/dir.c
	33	*
	34	* Copyright (C) 1991, 1992 Linus Torvalds
	35	*
	36	* ext2 directory handling functions
	37	*
	38	* Big-endian to little-endian byte-swapping/bitmaps by
	39	* David S. Miller ([email protected]), 1995
	40	*
	41	* All code that works with directory layout had been switched to pagecache
	42	* and moved here. AV
	43	*/
	44
	45	#include <linux/pagemap.h>
	46	#include <linux/smp_lock.h>
	47	#include "nilfs.h"
	48	#include "page.h"
	49
	50	/*
	51	* nilfs uses block-sized chunks. Arguably, sector-sized ones would be
	52	* more robust, but we have what we have
	53	*/
	54	static inline unsigned nilfs_chunk_size(struct inode *inode)
	55	{
	56	return inode->i_sb->s_blocksize;
	57	}
	58
	59	static inline void nilfs_put_page(struct page *page)
	60	{
	61	kunmap(page);
	62	page_cache_release(page);
	63	}
	64
65	static inline unsigned long dir_pages(struct inode *inode)
66	{
67	return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
68	}
69
70	/*
71	* Return the offset into page `page_nr' of the last valid
72	* byte in that page, plus one.
73	*/
74	static unsigned nilfs_last_byte(struct inode *inode, unsigned long page_nr)
75	{
76	unsigned last_byte = inode->i_size;
77
78	last_byte -= page_nr << PAGE_CACHE_SHIFT;
79	if (last_byte > PAGE_CACHE_SIZE)
80	last_byte = PAGE_CACHE_SIZE;
81	return last_byte;
82	}
83
84	static int nilfs_prepare_chunk_uninterruptible(struct page *page,
85	struct address_space *mapping,
86	unsigned from, unsigned to)
87	{
88	loff_t pos = page_offset(page) + from;
89	return block_write_begin(NULL, mapping, pos, to - from,
90	AOP_FLAG_UNINTERRUPTIBLE, &page,
91	NULL, nilfs_get_block);
92	}
93
94	static int nilfs_prepare_chunk(struct page *page,
95	struct address_space *mapping,
96	unsigned from, unsigned to)
97	{
98	loff_t pos = page_offset(page) + from;
99	return block_write_begin(NULL, mapping, pos, to - from, 0, &page,
100	NULL, nilfs_get_block);
101	}
102
103	static int nilfs_commit_chunk(struct page *page,
104	struct address_space *mapping,
105	unsigned from, unsigned to)
106	{
107	struct inode *dir = mapping->host;
108	struct nilfs_sb_info *sbi = NILFS_SB(dir->i_sb);
109	loff_t pos = page_offset(page) + from;
110	unsigned len = to - from;
111	unsigned nr_dirty, copied;
112	int err;
113
114	nr_dirty = nilfs_page_count_clean_buffers(page, from, to);
115	copied = block_write_end(NULL, mapping, pos, len, len, page, NULL);
116	if (pos + copied > dir->i_size) {
117	i_size_write(dir, pos + copied);
118	mark_inode_dirty(dir);
119	}
120	if (IS_DIRSYNC(dir))
121	nilfs_set_transaction_flag(NILFS_TI_SYNC);
122	err = nilfs_set_file_dirty(sbi, dir, nr_dirty);
123	unlock_page(page);
124	return err;
125	}
126
127	static void nilfs_check_page(struct page *page)
128	{
129	struct inode *dir = page->mapping->host;
130	struct super_block *sb = dir->i_sb;
131	unsigned chunk_size = nilfs_chunk_size(dir);
132	char *kaddr = page_address(page);
133	unsigned offs, rec_len;
134	unsigned limit = PAGE_CACHE_SIZE;
135	struct nilfs_dir_entry *p;
136	char *error;
137
138	if ((dir->i_size >> PAGE_CACHE_SHIFT) == page->index) {
139	limit = dir->i_size & ~PAGE_CACHE_MASK;
140	if (limit & (chunk_size - 1))
141	goto Ebadsize;
142	if (!limit)
143	goto out;
144	}
145	for (offs = 0; offs <= limit - NILFS_DIR_REC_LEN(1); offs += rec_len) {
146	p = (struct nilfs_dir_entry *)(kaddr + offs);
147	rec_len = le16_to_cpu(p->rec_len);
148
149	if (rec_len < NILFS_DIR_REC_LEN(1))
150	goto Eshort;
151	if (rec_len & 3)
152	goto Ealign;
153	if (rec_len < NILFS_DIR_REC_LEN(p->name_len))
154	goto Enamelen;
155	if (((offs + rec_len - 1) ^ offs) & ~(chunk_size-1))
156	goto Espan;
157	}
158	if (offs != limit)
159	goto Eend;
160	out:
161	SetPageChecked(page);
162	return;
163
164	/* Too bad, we had an error */
165
166	Ebadsize:
167	nilfs_error(sb, "nilfs_check_page",
168	"size of directory #%lu is not a multiple of chunk size",
169	dir->i_ino
170	);
171	goto fail;
172	Eshort:
173	error = "rec_len is smaller than minimal";
174	goto bad_entry;
175	Ealign:
176	error = "unaligned directory entry";
177	goto bad_entry;
178	Enamelen:
179	error = "rec_len is too small for name_len";
180	goto bad_entry;
181	Espan:
182	error = "directory entry across blocks";
183	bad_entry:
184	nilfs_error(sb, "nilfs_check_page", "bad entry in directory #%lu: %s - "
185	"offset=%lu, inode=%lu, rec_len=%d, name_len=%d",
186	dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs,
187	(unsigned long) le64_to_cpu(p->inode),
188	rec_len, p->name_len);
189	goto fail;
190	Eend:
191	p = (struct nilfs_dir_entry *)(kaddr + offs);
192	nilfs_error(sb, "nilfs_check_page",
193	"entry in directory #%lu spans the page boundary"
194	"offset=%lu, inode=%lu",
195	dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs,
196	(unsigned long) le64_to_cpu(p->inode));
197	fail:
198	SetPageChecked(page);
199	SetPageError(page);
200	}
201
202	static struct page nilfs_get_page(struct inode dir, unsigned long n)
203	{
204	struct address_space *mapping = dir->i_mapping;
205	struct page *page = read_cache_page(mapping, n,
206	(filler_t *)mapping->a_ops->readpage, NULL);
207	if (!IS_ERR(page)) {
208	wait_on_page_locked(page);
209	kmap(page);
210	if (!PageUptodate(page))
211	goto fail;
212	if (!PageChecked(page))
213	nilfs_check_page(page);
214	if (PageError(page))
215	goto fail;
216	}
217	return page;
218
219	fail:
220	nilfs_put_page(page);
221	return ERR_PTR(-EIO);
222	}
223
224	/*
225	* NOTE! unlike strncmp, nilfs_match returns 1 for success, 0 for failure.
226	*
227	* len <= NILFS_NAME_LEN and de != NULL are guaranteed by caller.
228	*/
229	static int
230	nilfs_match(int len, const char * const name, struct nilfs_dir_entry *de)
231	{
232	if (len != de->name_len)
233	return 0;
234	if (!de->inode)
235	return 0;
236	return !memcmp(name, de->name, len);
237	}
238
239	/*
240	* p is at least 6 bytes before the end of page
241	*/
242	static struct nilfs_dir_entry nilfs_next_entry(struct nilfs_dir_entry p)
243	{
244	return (struct nilfs_dir_entry )((char )p + le16_to_cpu(p->rec_len));
245	}
246
247	static unsigned char
248	nilfs_filetype_table[NILFS_FT_MAX] = {
249	[NILFS_FT_UNKNOWN] = DT_UNKNOWN,
250	[NILFS_FT_REG_FILE] = DT_REG,
251	[NILFS_FT_DIR] = DT_DIR,
252	[NILFS_FT_CHRDEV] = DT_CHR,
253	[NILFS_FT_BLKDEV] = DT_BLK,
254	[NILFS_FT_FIFO] = DT_FIFO,
255	[NILFS_FT_SOCK] = DT_SOCK,
256	[NILFS_FT_SYMLINK] = DT_LNK,
257	};
258
259	#define S_SHIFT 12
260	static unsigned char
261	nilfs_type_by_mode[S_IFMT >> S_SHIFT] = {
262	[S_IFREG >> S_SHIFT] = NILFS_FT_REG_FILE,
263	[S_IFDIR >> S_SHIFT] = NILFS_FT_DIR,
264	[S_IFCHR >> S_SHIFT] = NILFS_FT_CHRDEV,
265	[S_IFBLK >> S_SHIFT] = NILFS_FT_BLKDEV,
266	[S_IFIFO >> S_SHIFT] = NILFS_FT_FIFO,
267	[S_IFSOCK >> S_SHIFT] = NILFS_FT_SOCK,
268	[S_IFLNK >> S_SHIFT] = NILFS_FT_SYMLINK,
269	};
270
271	static void nilfs_set_de_type(struct nilfs_dir_entry de, struct inode inode)
272	{
273	mode_t mode = inode->i_mode;
274
275	de->file_type = nilfs_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
276	}
277
278	static int nilfs_readdir(struct file filp, void dirent, filldir_t filldir)
279	{
280	loff_t pos = filp->f_pos;
281	struct inode *inode = filp->f_dentry->d_inode;
282	struct super_block *sb = inode->i_sb;
283	unsigned int offset = pos & ~PAGE_CACHE_MASK;
284	unsigned long n = pos >> PAGE_CACHE_SHIFT;
285	unsigned long npages = dir_pages(inode);
286	/* unsigned chunk_mask = ~(nilfs_chunk_size(inode)-1); */
287	unsigned char *types = NULL;
288	int ret;
289
290	if (pos > inode->i_size - NILFS_DIR_REC_LEN(1))
291	goto success;
292
293	types = nilfs_filetype_table;
294
295	for ( ; n < npages; n++, offset = 0) {
296	char kaddr, limit;
297	struct nilfs_dir_entry *de;
298	struct page *page = nilfs_get_page(inode, n);
299
300	if (IS_ERR(page)) {
301	nilfs_error(sb, __func__, "bad page in #%lu",
302	inode->i_ino);
303	filp->f_pos += PAGE_CACHE_SIZE - offset;
304	ret = -EIO;
305	goto done;
306	}
307	kaddr = page_address(page);
308	de = (struct nilfs_dir_entry *)(kaddr + offset);
309	limit = kaddr + nilfs_last_byte(inode, n) -
310	NILFS_DIR_REC_LEN(1);
311	for ( ; (char *)de <= limit; de = nilfs_next_entry(de)) {
312	if (de->rec_len == 0) {
313	nilfs_error(sb, __func__,
314	"zero-length directory entry");
315	ret = -EIO;
316	nilfs_put_page(page);
317	goto done;
318	}
319	if (de->inode) {
320	int over;
321	unsigned char d_type = DT_UNKNOWN;
322
323	if (types && de->file_type < NILFS_FT_MAX)
324	d_type = types[de->file_type];
325
326	offset = (char *)de - kaddr;
327	over = filldir(dirent, de->name, de->name_len,
328	(n<<PAGE_CACHE_SHIFT) \| offset,
329	le64_to_cpu(de->inode), d_type);
330	if (over) {
331	nilfs_put_page(page);
332	goto success;
333	}
334	}
335	filp->f_pos += le16_to_cpu(de->rec_len);
336	}
337	nilfs_put_page(page);
338	}
339
340	success:
341	ret = 0;
342	done:
343	return ret;
344	}
345
346	/*
347	* nilfs_find_entry()
348	*
349	* finds an entry in the specified directory with the wanted name. It
350	* returns the page in which the entry was found, and the entry itself
351	* (as a parameter - res_dir). Page is returned mapped and unlocked.
352	* Entry is guaranteed to be valid.
353	*/
354	struct nilfs_dir_entry *
355	nilfs_find_entry(struct inode dir, struct dentry dentry,
356	struct page **res_page)
357	{
358	const char *name = dentry->d_name.name;
359	int namelen = dentry->d_name.len;
360	unsigned reclen = NILFS_DIR_REC_LEN(namelen);
361	unsigned long start, n;
362	unsigned long npages = dir_pages(dir);
363	struct page *page = NULL;
364	struct nilfs_inode_info *ei = NILFS_I(dir);
365	struct nilfs_dir_entry *de;
366
367	if (npages == 0)
368	goto out;
369
370	/* OFFSET_CACHE */
371	*res_page = NULL;
372
373	start = ei->i_dir_start_lookup;
374	if (start >= npages)
375	start = 0;
376	n = start;
377	do {
378	char *kaddr;
379	page = nilfs_get_page(dir, n);
380	if (!IS_ERR(page)) {
381	kaddr = page_address(page);
382	de = (struct nilfs_dir_entry *)kaddr;
383	kaddr += nilfs_last_byte(dir, n) - reclen;
384	while ((char *) de <= kaddr) {
385	if (de->rec_len == 0) {
386	nilfs_error(dir->i_sb, __func__,
387	"zero-length directory entry");
388	nilfs_put_page(page);
389	goto out;
390	}
391	if (nilfs_match(namelen, name, de))
392	goto found;
393	de = nilfs_next_entry(de);
394	}
395	nilfs_put_page(page);
396	}
397	if (++n >= npages)
398	n = 0;
399	/* next page is past the blocks we've got */
400	if (unlikely(n > (dir->i_blocks >> (PAGE_CACHE_SHIFT - 9)))) {
401	nilfs_error(dir->i_sb, __func__,
402	"dir %lu size %lld exceeds block cout %llu",
403	dir->i_ino, dir->i_size,
404	(unsigned long long)dir->i_blocks);
405	goto out;
406	}
407	} while (n != start);
408	out:
409	return NULL;
410
411	found:
412	*res_page = page;
413	ei->i_dir_start_lookup = n;
414	return de;
415	}
416
417	struct nilfs_dir_entry nilfs_dotdot(struct inode dir, struct page **p)
418	{
419	struct page *page = nilfs_get_page(dir, 0);
420	struct nilfs_dir_entry *de = NULL;
421
422	if (!IS_ERR(page)) {
423	de = nilfs_next_entry(
424	(struct nilfs_dir_entry *)page_address(page));
425	*p = page;
426	}
427	return de;
428	}
429
430	ino_t nilfs_inode_by_name(struct inode dir, struct dentry dentry)
431	{
432	ino_t res = 0;
433	struct nilfs_dir_entry *de;
434	struct page *page;
435
436	de = nilfs_find_entry(dir, dentry, &page);
437	if (de) {
438	res = le64_to_cpu(de->inode);
439	kunmap(page);
440	page_cache_release(page);
441	}
442	return res;
443	}
444
445	/* Releases the page */
446	void nilfs_set_link(struct inode dir, struct nilfs_dir_entry de,
447	struct page page, struct inode inode)
448	{
449	unsigned from = (char ) de - (char ) page_address(page);
450	unsigned to = from + le16_to_cpu(de->rec_len);
451	struct address_space *mapping = page->mapping;
452	int err;
453
454	lock_page(page);
455	err = nilfs_prepare_chunk_uninterruptible(page, mapping, from, to);
456	BUG_ON(err);
457	de->inode = cpu_to_le64(inode->i_ino);
458	nilfs_set_de_type(de, inode);
459	err = nilfs_commit_chunk(page, mapping, from, to);
460	nilfs_put_page(page);
461	dir->i_mtime = dir->i_ctime = CURRENT_TIME;
462	/* NILFS_I(dir)->i_flags &= ~NILFS_BTREE_FL; */
463	mark_inode_dirty(dir);
464	}
465
466	/*
467	* Parent is locked.
468	*/
469	int nilfs_add_link(struct dentry dentry, struct inode inode)
470	{
471	struct inode *dir = dentry->d_parent->d_inode;
472	const char *name = dentry->d_name.name;
473	int namelen = dentry->d_name.len;
474	unsigned chunk_size = nilfs_chunk_size(dir);
475	unsigned reclen = NILFS_DIR_REC_LEN(namelen);
476	unsigned short rec_len, name_len;
477	struct page *page = NULL;
478	struct nilfs_dir_entry *de;
479	unsigned long npages = dir_pages(dir);
480	unsigned long n;
481	char *kaddr;
482	unsigned from, to;
483	int err;
484
485	/*
486	* We take care of directory expansion in the same loop.
487	* This code plays outside i_size, so it locks the page
488	* to protect that region.
489	*/
490	for (n = 0; n <= npages; n++) {
491	char *dir_end;
492
493	page = nilfs_get_page(dir, n);
494	err = PTR_ERR(page);
495	if (IS_ERR(page))
496	goto out;
497	lock_page(page);
498	kaddr = page_address(page);
499	dir_end = kaddr + nilfs_last_byte(dir, n);
500	de = (struct nilfs_dir_entry *)kaddr;
501	kaddr += PAGE_CACHE_SIZE - reclen;
502	while ((char *)de <= kaddr) {
503	if ((char *)de == dir_end) {
504	/* We hit i_size */
505	name_len = 0;
506	rec_len = chunk_size;
507	de->rec_len = cpu_to_le16(chunk_size);
508	de->inode = 0;
509	goto got_it;
510	}
511	if (de->rec_len == 0) {
512	nilfs_error(dir->i_sb, __func__,
513	"zero-length directory entry");
514	err = -EIO;
515	goto out_unlock;
516	}
517	err = -EEXIST;
518	if (nilfs_match(namelen, name, de))
519	goto out_unlock;
520	name_len = NILFS_DIR_REC_LEN(de->name_len);
521	rec_len = le16_to_cpu(de->rec_len);
522	if (!de->inode && rec_len >= reclen)
523	goto got_it;
524	if (rec_len >= name_len + reclen)
525	goto got_it;
526	de = (struct nilfs_dir_entry )((char )de + rec_len);
527	}
528	unlock_page(page);
529	nilfs_put_page(page);
530	}
531	BUG();
532	return -EINVAL;
533
534	got_it:
535	from = (char )de - (char )page_address(page);
536	to = from + rec_len;
537	err = nilfs_prepare_chunk(page, page->mapping, from, to);
538	if (err)
539	goto out_unlock;
540	if (de->inode) {
541	struct nilfs_dir_entry *de1;
542
543	de1 = (struct nilfs_dir_entry )((char )de + name_len);
544	de1->rec_len = cpu_to_le16(rec_len - name_len);
545	de->rec_len = cpu_to_le16(name_len);
546	de = de1;
547	}
548	de->name_len = namelen;
549	memcpy(de->name, name, namelen);
550	de->inode = cpu_to_le64(inode->i_ino);
551	nilfs_set_de_type(de, inode);
552	err = nilfs_commit_chunk(page, page->mapping, from, to);
553	dir->i_mtime = dir->i_ctime = CURRENT_TIME;
554	/* NILFS_I(dir)->i_flags &= ~NILFS_BTREE_FL; */
555	mark_inode_dirty(dir);
556	/* OFFSET_CACHE */
557	out_put:
558	nilfs_put_page(page);
559	out:
560	return err;
561	out_unlock:
562	unlock_page(page);
563	goto out_put;
564	}
565
566	/*
567	* nilfs_delete_entry deletes a directory entry by merging it with the
568	* previous entry. Page is up-to-date. Releases the page.
569	*/
570	int nilfs_delete_entry(struct nilfs_dir_entry dir, struct page page)
571	{
572	struct address_space *mapping = page->mapping;
573	struct inode *inode = mapping->host;
574	char *kaddr = page_address(page);
575	unsigned from = ((char *)dir - kaddr) & ~(nilfs_chunk_size(inode) - 1);
576	unsigned to = ((char *)dir - kaddr) + le16_to_cpu(dir->rec_len);
577	struct nilfs_dir_entry *pde = NULL;
578	struct nilfs_dir_entry de = (struct nilfs_dir_entry )(kaddr + from);
579	int err;
580
581	while ((char )de < (char )dir) {
582	if (de->rec_len == 0) {
583	nilfs_error(inode->i_sb, __func__,
584	"zero-length directory entry");
585	err = -EIO;
586	goto out;
587	}
588	pde = de;
589	de = nilfs_next_entry(de);
590	}
591	if (pde)
592	from = (char )pde - (char )page_address(page);
593	lock_page(page);
594	err = nilfs_prepare_chunk(page, mapping, from, to);
595	BUG_ON(err);
596	if (pde)
597	pde->rec_len = cpu_to_le16(to - from);
598	dir->inode = 0;
599	err = nilfs_commit_chunk(page, mapping, from, to);
600	inode->i_ctime = inode->i_mtime = CURRENT_TIME;
601	/* NILFS_I(inode)->i_flags &= ~NILFS_BTREE_FL; */
602	mark_inode_dirty(inode);
603	out:
604	nilfs_put_page(page);
605	return err;
606	}
607
608	/*
609	* Set the first fragment of directory.
610	*/
611	int nilfs_make_empty(struct inode inode, struct inode parent)
612	{
613	struct address_space *mapping = inode->i_mapping;
614	struct page *page = grab_cache_page(mapping, 0);
615	unsigned chunk_size = nilfs_chunk_size(inode);
616	struct nilfs_dir_entry *de;
617	int err;
618	void *kaddr;
619
620	if (!page)
621	return -ENOMEM;
622
623	err = nilfs_prepare_chunk(page, mapping, 0, chunk_size);
624	if (unlikely(err)) {
625	unlock_page(page);
626	goto fail;
627	}
628	kaddr = kmap_atomic(page, KM_USER0);
629	memset(kaddr, 0, chunk_size);
630	de = (struct nilfs_dir_entry *)kaddr;
631	de->name_len = 1;
632	de->rec_len = cpu_to_le16(NILFS_DIR_REC_LEN(1));
633	memcpy(de->name, ".\0\0", 4);
634	de->inode = cpu_to_le64(inode->i_ino);
635	nilfs_set_de_type(de, inode);
636
637	de = (struct nilfs_dir_entry *)(kaddr + NILFS_DIR_REC_LEN(1));
638	de->name_len = 2;
639	de->rec_len = cpu_to_le16(chunk_size - NILFS_DIR_REC_LEN(1));
640	de->inode = cpu_to_le64(parent->i_ino);
641	memcpy(de->name, "..\0", 4);
642	nilfs_set_de_type(de, inode);
643	kunmap_atomic(kaddr, KM_USER0);
644	err = nilfs_commit_chunk(page, mapping, 0, chunk_size);
645	fail:
646	page_cache_release(page);
647	return err;
648	}
649
650	/*
651	* routine to check that the specified directory is empty (for rmdir)
652	*/
653	int nilfs_empty_dir(struct inode *inode)
654	{
655	struct page *page = NULL;
656	unsigned long i, npages = dir_pages(inode);
657
658	for (i = 0; i < npages; i++) {
659	char *kaddr;
660	struct nilfs_dir_entry *de;
661
662	page = nilfs_get_page(inode, i);
663	if (IS_ERR(page))
664	continue;
665
666	kaddr = page_address(page);
667	de = (struct nilfs_dir_entry *)kaddr;
668	kaddr += nilfs_last_byte(inode, i) - NILFS_DIR_REC_LEN(1);
669
670	while ((char *)de <= kaddr) {
671	if (de->rec_len == 0) {
672	nilfs_error(inode->i_sb, __func__,
673	"zero-length directory entry "
674	"(kaddr=%p, de=%p)\n", kaddr, de);
675	goto not_empty;
676	}
677	if (de->inode != 0) {
678	/* check for . and .. */
679	if (de->name[0] != '.')
680	goto not_empty;
681	if (de->name_len > 2)
682	goto not_empty;
683	if (de->name_len < 2) {
684	if (de->inode !=
685	cpu_to_le64(inode->i_ino))
686	goto not_empty;
687	} else if (de->name[1] != '.')
688	goto not_empty;
689	}
690	de = nilfs_next_entry(de);
691	}
692	nilfs_put_page(page);
693	}
694	return 1;
695
696	not_empty:
697	nilfs_put_page(page);
698	return 0;
699	}
700
701	struct file_operations nilfs_dir_operations = {
702	.llseek = generic_file_llseek,
703	.read = generic_read_dir,
704	.readdir = nilfs_readdir,
7a946193	705	.unlocked_ioctl = nilfs_ioctl,
2ba466d7	706	#ifdef CONFIG_COMPAT
8082d36a	707	.compat_ioctl = nilfs_ioctl,
2ba466d7 YA	708	#endif /* CONFIG_COMPAT */
	709	.fsync = nilfs_sync_file,
	710
	711	};