[mirror_ubuntu-artful-kernel.git] / fs / ufs / dir.c

/*
 *  linux/fs/ufs/ufs_dir.c
 *
 * Copyright (C) 1996
 * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
 * Laboratory for Computer Science Research Computing Facility
 * Rutgers, The State University of New Jersey
 *
 * swab support by Francois-Rene Rideau <fare@tunes.org> 19970406
 *
 * 4.4BSD (FreeBSD) support added on February 1st 1998 by
 * Niels Kristian Bech Jensen <nkbj@image.dk> partially based
 * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>.
 *
 * Migration to usage of "page cache" on May 2006 by
 * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
 */

#include <linux/time.h>
#include <linux/fs.h>
#include <linux/swap.h>

#include "ufs_fs.h"
#include "ufs.h"
#include "swab.h"
#include "util.h"

/*
 * NOTE! unlike strncmp, ufs_match returns 1 for success, 0 for failure.
 *
 * len <= UFS_MAXNAMLEN and de != NULL are guaranteed by caller.
 */
static inline int ufs_match(struct super_block *sb, int len,
		const unsigned char *name, struct ufs_dir_entry *de)
{
	if (len != ufs_get_de_namlen(sb, de))
		return 0;
	if (!de->d_ino)
		return 0;
	return !memcmp(name, de->d_name, len);
}

static int ufs_commit_chunk(struct page *page, loff_t pos, unsigned len)
{
	struct address_space *mapping = page->mapping;
	struct inode *dir = mapping->host;
	int err = 0;

	dir->i_version++;
	block_write_end(NULL, mapping, pos, len, len, page, NULL);
	if (pos+len > dir->i_size) {
		i_size_write(dir, pos+len);
		mark_inode_dirty(dir);
	}
	if (IS_DIRSYNC(dir))
		err = write_one_page(page);
	else
		unlock_page(page);
	return err;
}

static inline void ufs_put_page(struct page *page)
{
	kunmap(page);
	put_page(page);
}

ino_t ufs_inode_by_name(struct inode *dir, const struct qstr *qstr)
{
	ino_t res = 0;
	struct ufs_dir_entry *de;
	struct page *page;
	
	de = ufs_find_entry(dir, qstr, &page);
	if (de) {
		res = fs32_to_cpu(dir->i_sb, de->d_ino);
		ufs_put_page(page);
	}
	return res;
}


/* Releases the page */
void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
		  struct page *page, struct inode *inode,
		  bool update_times)
{
	loff_t pos = page_offset(page) +
			(char *) de - (char *) page_address(page);
	unsigned len = fs16_to_cpu(dir->i_sb, de->d_reclen);
	int err;

	lock_page(page);
	err = ufs_prepare_chunk(page, pos, len);
	BUG_ON(err);

	de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
	ufs_set_de_type(dir->i_sb, de, inode->i_mode);

	err = ufs_commit_chunk(page, pos, len);
	ufs_put_page(page);
	if (update_times)
		dir->i_mtime = dir->i_ctime = current_time(dir);
	mark_inode_dirty(dir);
}


static bool ufs_check_page(struct page *page)
{
	struct inode *dir = page->mapping->host;
	struct super_block *sb = dir->i_sb;
	char *kaddr = page_address(page);
	unsigned offs, rec_len;
	unsigned limit = PAGE_SIZE;
	const unsigned chunk_mask = UFS_SB(sb)->s_uspi->s_dirblksize - 1;
	struct ufs_dir_entry *p;
	char *error;

	if ((dir->i_size >> PAGE_SHIFT) == page->index) {
		limit = dir->i_size & ~PAGE_MASK;
		if (limit & chunk_mask)
			goto Ebadsize;
		if (!limit)
			goto out;
	}
	for (offs = 0; offs <= limit - UFS_DIR_REC_LEN(1); offs += rec_len) {
		p = (struct ufs_dir_entry *)(kaddr + offs);
		rec_len = fs16_to_cpu(sb, p->d_reclen);

		if (rec_len < UFS_DIR_REC_LEN(1))
			goto Eshort;
		if (rec_len & 3)
			goto Ealign;
		if (rec_len < UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, p)))
			goto Enamelen;
		if (((offs + rec_len - 1) ^ offs) & ~chunk_mask)
			goto Espan;
		if (fs32_to_cpu(sb, p->d_ino) > (UFS_SB(sb)->s_uspi->s_ipg *
						  UFS_SB(sb)->s_uspi->s_ncg))
			goto Einumber;
	}
	if (offs != limit)
		goto Eend;
out:
	SetPageChecked(page);
	return true;

	/* Too bad, we had an error */

Ebadsize:
	ufs_error(sb, "ufs_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";
	goto bad_entry;
Einumber:
	error = "inode out of bounds";
bad_entry:
	ufs_error (sb, "ufs_check_page", "bad entry in directory #%lu: %s - "
		   "offset=%lu, rec_len=%d, name_len=%d",
		   dir->i_ino, error, (page->index<<PAGE_SHIFT)+offs,
		   rec_len, ufs_get_de_namlen(sb, p));
	goto fail;
Eend:
	p = (struct ufs_dir_entry *)(kaddr + offs);
	ufs_error(sb, __func__,
		   "entry in directory #%lu spans the page boundary"
		   "offset=%lu",
		   dir->i_ino, (page->index<<PAGE_SHIFT)+offs);
fail:
	SetPageError(page);
	return false;
}

static struct page *ufs_get_page(struct inode *dir, unsigned long n)
{
	struct address_space *mapping = dir->i_mapping;
	struct page *page = read_mapping_page(mapping, n, NULL);
	if (!IS_ERR(page)) {
		kmap(page);
		if (unlikely(!PageChecked(page))) {
			if (PageError(page) || !ufs_check_page(page))
				goto fail;
		}
	}
	return page;

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

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

	last_byte -= page_nr << PAGE_SHIFT;
	if (last_byte > PAGE_SIZE)
		last_byte = PAGE_SIZE;
	return last_byte;
}

static inline struct ufs_dir_entry *
ufs_next_entry(struct super_block *sb, struct ufs_dir_entry *p)
{
	return (struct ufs_dir_entry *)((char *)p +
					fs16_to_cpu(sb, p->d_reclen));
}

struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct page **p)
{
	struct page *page = ufs_get_page(dir, 0);
	struct ufs_dir_entry *de = NULL;

	if (!IS_ERR(page)) {
		de = ufs_next_entry(dir->i_sb,
				    (struct ufs_dir_entry *)page_address(page));
		*p = page;
	}
	return de;
}

/*
 *	ufs_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 ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr,
				     struct page **res_page)
{
	struct super_block *sb = dir->i_sb;
	const unsigned char *name = qstr->name;
	int namelen = qstr->len;
	unsigned reclen = UFS_DIR_REC_LEN(namelen);
	unsigned long start, n;
	unsigned long npages = dir_pages(dir);
	struct page *page = NULL;
	struct ufs_inode_info *ui = UFS_I(dir);
	struct ufs_dir_entry *de;

	UFSD("ENTER, dir_ino %lu, name %s, namlen %u\n", dir->i_ino, name, namelen);

	if (npages == 0 || namelen > UFS_MAXNAMLEN)
		goto out;

	/* OFFSET_CACHE */
	*res_page = NULL;

	start = ui->i_dir_start_lookup;

	if (start >= npages)
		start = 0;
	n = start;
	do {
		char *kaddr;
		page = ufs_get_page(dir, n);
		if (!IS_ERR(page)) {
			kaddr = page_address(page);
			de = (struct ufs_dir_entry *) kaddr;
			kaddr += ufs_last_byte(dir, n) - reclen;
			while ((char *) de <= kaddr) {
				if (ufs_match(sb, namelen, name, de))
					goto found;
				de = ufs_next_entry(sb, de);
			}
			ufs_put_page(page);
		}
		if (++n >= npages)
			n = 0;
	} while (n != start);
out:
	return NULL;

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

/*
 *	Parent is locked.
 */
int ufs_add_link(struct dentry *dentry, struct inode *inode)
{
	struct inode *dir = d_inode(dentry->d_parent);
	const unsigned char *name = dentry->d_name.name;
	int namelen = dentry->d_name.len;
	struct super_block *sb = dir->i_sb;
	unsigned reclen = UFS_DIR_REC_LEN(namelen);
	const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
	unsigned short rec_len, name_len;
	struct page *page = NULL;
	struct ufs_dir_entry *de;
	unsigned long npages = dir_pages(dir);
	unsigned long n;
	char *kaddr;
	loff_t pos;
	int err;

	UFSD("ENTER, name %s, namelen %u\n", name, namelen);

	/*
	 * 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 = ufs_get_page(dir, n);
		err = PTR_ERR(page);
		if (IS_ERR(page))
			goto out;
		lock_page(page);
		kaddr = page_address(page);
		dir_end = kaddr + ufs_last_byte(dir, n);
		de = (struct ufs_dir_entry *)kaddr;
		kaddr += PAGE_SIZE - reclen;
		while ((char *)de <= kaddr) {
			if ((char *)de == dir_end) {
				/* We hit i_size */
				name_len = 0;
				rec_len = chunk_size;
				de->d_reclen = cpu_to_fs16(sb, chunk_size);
				de->d_ino = 0;
				goto got_it;
			}
			if (de->d_reclen == 0) {
				ufs_error(dir->i_sb, __func__,
					  "zero-length directory entry");
				err = -EIO;
				goto out_unlock;
			}
			err = -EEXIST;
			if (ufs_match(sb, namelen, name, de))
				goto out_unlock;
			name_len = UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de));
			rec_len = fs16_to_cpu(sb, de->d_reclen);
			if (!de->d_ino && rec_len >= reclen)
				goto got_it;
			if (rec_len >= name_len + reclen)
				goto got_it;
			de = (struct ufs_dir_entry *) ((char *) de + rec_len);
		}
		unlock_page(page);
		ufs_put_page(page);
	}
	BUG();
	return -EINVAL;

got_it:
	pos = page_offset(page) +
			(char*)de - (char*)page_address(page);
	err = ufs_prepare_chunk(page, pos, rec_len);
	if (err)
		goto out_unlock;
	if (de->d_ino) {
		struct ufs_dir_entry *de1 =
			(struct ufs_dir_entry *) ((char *) de + name_len);
		de1->d_reclen = cpu_to_fs16(sb, rec_len - name_len);
		de->d_reclen = cpu_to_fs16(sb, name_len);

		de = de1;
	}

	ufs_set_de_namlen(sb, de, namelen);
	memcpy(de->d_name, name, namelen + 1);
	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
	ufs_set_de_type(sb, de, inode->i_mode);

	err = ufs_commit_chunk(page, pos, rec_len);
	dir->i_mtime = dir->i_ctime = current_time(dir);

	mark_inode_dirty(dir);
	/* OFFSET_CACHE */
out_put:
	ufs_put_page(page);
out:
	return err;
out_unlock:
	unlock_page(page);
	goto out_put;
}

static inline unsigned
ufs_validate_entry(struct super_block *sb, char *base,
		   unsigned offset, unsigned mask)
{
	struct ufs_dir_entry *de = (struct ufs_dir_entry*)(base + offset);
	struct ufs_dir_entry *p = (struct ufs_dir_entry*)(base + (offset&mask));
	while ((char*)p < (char*)de)
		p = ufs_next_entry(sb, p);
	return (char *)p - base;
}


/*
 * This is blatantly stolen from ext2fs
 */
static int
ufs_readdir(struct file *file, struct dir_context *ctx)
{
	loff_t pos = ctx->pos;
	struct inode *inode = file_inode(file);
	struct super_block *sb = inode->i_sb;
	unsigned int offset = pos & ~PAGE_MASK;
	unsigned long n = pos >> PAGE_SHIFT;
	unsigned long npages = dir_pages(inode);
	unsigned chunk_mask = ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
	int need_revalidate = file->f_version != inode->i_version;
	unsigned flags = UFS_SB(sb)->s_flags;

	UFSD("BEGIN\n");

	if (pos > inode->i_size - UFS_DIR_REC_LEN(1))
		return 0;

	for ( ; n < npages; n++, offset = 0) {
		char *kaddr, *limit;
		struct ufs_dir_entry *de;

		struct page *page = ufs_get_page(inode, n);

		if (IS_ERR(page)) {
			ufs_error(sb, __func__,
				  "bad page in #%lu",
				  inode->i_ino);
			ctx->pos += PAGE_SIZE - offset;
			return -EIO;
		}
		kaddr = page_address(page);
		if (unlikely(need_revalidate)) {
			if (offset) {
				offset = ufs_validate_entry(sb, kaddr, offset, chunk_mask);
				ctx->pos = (n<<PAGE_SHIFT) + offset;
			}
			file->f_version = inode->i_version;
			need_revalidate = 0;
		}
		de = (struct ufs_dir_entry *)(kaddr+offset);
		limit = kaddr + ufs_last_byte(inode, n) - UFS_DIR_REC_LEN(1);
		for ( ;(char*)de <= limit; de = ufs_next_entry(sb, de)) {
			if (de->d_ino) {
				unsigned char d_type = DT_UNKNOWN;

				UFSD("filldir(%s,%u)\n", de->d_name,
				      fs32_to_cpu(sb, de->d_ino));
				UFSD("namlen %u\n", ufs_get_de_namlen(sb, de));

				if ((flags & UFS_DE_MASK) == UFS_DE_44BSD)
					d_type = de->d_u.d_44.d_type;

				if (!dir_emit(ctx, de->d_name,
					       ufs_get_de_namlen(sb, de),
					       fs32_to_cpu(sb, de->d_ino),
					       d_type)) {
					ufs_put_page(page);
					return 0;
				}
			}
			ctx->pos += fs16_to_cpu(sb, de->d_reclen);
		}
		ufs_put_page(page);
	}
	return 0;
}


/*
 * ufs_delete_entry deletes a directory entry by merging it with the
 * previous entry.
 */
int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
		     struct page * page)
{
	struct super_block *sb = inode->i_sb;
	char *kaddr = page_address(page);
	unsigned from = ((char*)dir - kaddr) & ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
	unsigned to = ((char*)dir - kaddr) + fs16_to_cpu(sb, dir->d_reclen);
	loff_t pos;
	struct ufs_dir_entry *pde = NULL;
	struct ufs_dir_entry *de = (struct ufs_dir_entry *) (kaddr + from);
	int err;

	UFSD("ENTER\n");

	UFSD("ino %u, reclen %u, namlen %u, name %s\n",
	      fs32_to_cpu(sb, de->d_ino),
	      fs16_to_cpu(sb, de->d_reclen),
	      ufs_get_de_namlen(sb, de), de->d_name);

	while ((char*)de < (char*)dir) {
		if (de->d_reclen == 0) {
			ufs_error(inode->i_sb, __func__,
				  "zero-length directory entry");
			err = -EIO;
			goto out;
		}
		pde = de;
		de = ufs_next_entry(sb, de);
	}
	if (pde)
		from = (char*)pde - (char*)page_address(page);

	pos = page_offset(page) + from;
	lock_page(page);
	err = ufs_prepare_chunk(page, pos, to - from);
	BUG_ON(err);
	if (pde)
		pde->d_reclen = cpu_to_fs16(sb, to - from);
	dir->d_ino = 0;
	err = ufs_commit_chunk(page, pos, to - from);
	inode->i_ctime = inode->i_mtime = current_time(inode);
	mark_inode_dirty(inode);
out:
	ufs_put_page(page);
	UFSD("EXIT\n");
	return err;
}

int ufs_make_empty(struct inode * inode, struct inode *dir)
{
	struct super_block * sb = dir->i_sb;
	struct address_space *mapping = inode->i_mapping;
	struct page *page = grab_cache_page(mapping, 0);
	const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
	struct ufs_dir_entry * de;
	char *base;
	int err;

	if (!page)
		return -ENOMEM;

	err = ufs_prepare_chunk(page, 0, chunk_size);
	if (err) {
		unlock_page(page);
		goto fail;
	}

	kmap(page);
	base = (char*)page_address(page);
	memset(base, 0, PAGE_SIZE);

	de = (struct ufs_dir_entry *) base;

	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
	ufs_set_de_type(sb, de, inode->i_mode);
	ufs_set_de_namlen(sb, de, 1);
	de->d_reclen = cpu_to_fs16(sb, UFS_DIR_REC_LEN(1));
	strcpy (de->d_name, ".");
	de = (struct ufs_dir_entry *)
		((char *)de + fs16_to_cpu(sb, de->d_reclen));
	de->d_ino = cpu_to_fs32(sb, dir->i_ino);
	ufs_set_de_type(sb, de, dir->i_mode);
	de->d_reclen = cpu_to_fs16(sb, chunk_size - UFS_DIR_REC_LEN(1));
	ufs_set_de_namlen(sb, de, 2);
	strcpy (de->d_name, "..");
	kunmap(page);

	err = ufs_commit_chunk(page, 0, chunk_size);
fail:
	put_page(page);
	return err;
}

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

	for (i = 0; i < npages; i++) {
		char *kaddr;
		struct ufs_dir_entry *de;
		page = ufs_get_page(inode, i);

		if (IS_ERR(page))
			continue;

		kaddr = page_address(page);
		de = (struct ufs_dir_entry *)kaddr;
		kaddr += ufs_last_byte(inode, i) - UFS_DIR_REC_LEN(1);

		while ((char *)de <= kaddr) {
			if (de->d_reclen == 0) {
				ufs_error(inode->i_sb, __func__,
					"zero-length directory entry: "
					"kaddr=%p, de=%p\n", kaddr, de);
				goto not_empty;
			}
			if (de->d_ino) {
				u16 namelen=ufs_get_de_namlen(sb, de);
				/* check for . and .. */
				if (de->d_name[0] != '.')
					goto not_empty;
				if (namelen > 2)
					goto not_empty;
				if (namelen < 2) {
					if (inode->i_ino !=
					    fs32_to_cpu(sb, de->d_ino))
						goto not_empty;
				} else if (de->d_name[1] != '.')
					goto not_empty;
			}
			de = ufs_next_entry(sb, de);
		}
		ufs_put_page(page);
	}
	return 1;

not_empty:
	ufs_put_page(page);
	return 0;
}

const struct file_operations ufs_dir_operations = {
	.read		= generic_read_dir,
	.iterate_shared	= ufs_readdir,
	.fsync		= generic_file_fsync,
	.llseek		= generic_file_llseek,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ufs/ufs_dir.c
	3	*
	4	* Copyright (C) 1996
	5	* Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
	6	* Laboratory for Computer Science Research Computing Facility
	7	* Rutgers, The State University of New Jersey
	8	*
	9	* swab support by Francois-Rene Rideau <fare@tunes.org> 19970406
	10	*
	11	* 4.4BSD (FreeBSD) support added on February 1st 1998 by
	12	* Niels Kristian Bech Jensen <nkbj@image.dk> partially based
	13	* on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>.
b71034e5 ED	14	*
	15	* Migration to usage of "page cache" on May 2006 by
	16	* Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
1da177e4 LT	17	*/
	18
	19	#include <linux/time.h>
	20	#include <linux/fs.h>
82b9d1d0	21	#include <linux/swap.h>
1da177e4	22
e5420598	23	#include "ufs_fs.h"
bcd6d4ec	24	#include "ufs.h"
1da177e4 LT	25	#include "swab.h"
	26	#include "util.h"
	27
1da177e4 LT	28	/*
	29	* NOTE! unlike strncmp, ufs_match returns 1 for success, 0 for failure.
	30	*
	31	* len <= UFS_MAXNAMLEN and de != NULL are guaranteed by caller.
	32	*/
	33	static inline int ufs_match(struct super_block *sb, int len,
89031bc7	34	const unsigned char name, struct ufs_dir_entry de)
1da177e4 LT	35	{
	36	if (len != ufs_get_de_namlen(sb, de))
	37	return 0;
	38	if (!de->d_ino)
	39	return 0;
	40	return !memcmp(name, de->d_name, len);
	41	}
	42
82b9d1d0	43	static int ufs_commit_chunk(struct page *page, loff_t pos, unsigned len)
1da177e4	44	{
82b9d1d0 NP	45	struct address_space *mapping = page->mapping;
82b9d1d0 NP	46	struct inode *dir = mapping->host;
b71034e5	47	int err = 0;
82b9d1d0	48
b71034e5	49	dir->i_version++;
82b9d1d0 NP	50	block_write_end(NULL, mapping, pos, len, len, page, NULL);
	51	if (pos+len > dir->i_size) {
	52	i_size_write(dir, pos+len);
	53	mark_inode_dirty(dir);
	54	}
b71034e5	55	if (IS_DIRSYNC(dir))
2b69c828	56	err = write_one_page(page);
b71034e5 ED	57	else
	58	unlock_page(page);
	59	return err;
	60	}
1da177e4	61
b71034e5 ED	62	static inline void ufs_put_page(struct page *page)
	63	{
	64	kunmap(page);
09cbfeaf	65	put_page(page);
b71034e5	66	}
1da177e4	67
89031bc7	68	ino_t ufs_inode_by_name(struct inode dir, const struct qstr qstr)
b71034e5 ED	69	{
	70	ino_t res = 0;
	71	struct ufs_dir_entry *de;
	72	struct page *page;
	73
08049707	74	de = ufs_find_entry(dir, qstr, &page);
b71034e5 ED	75	if (de) {
	76	res = fs32_to_cpu(dir->i_sb, de->d_ino);
	77	ufs_put_page(page);
1da177e4	78	}
b71034e5	79	return res;
1da177e4 LT	80	}
1da177e4 LT	81
1da177e4	82
b71034e5 ED	83	/* Releases the page */
b71034e5 ED	84	void ufs_set_link(struct inode dir, struct ufs_dir_entry de,
70d45cdb AV	85	struct page page, struct inode inode,
70d45cdb AV	86	bool update_times)
1da177e4	87	{
82b9d1d0 NP	88	loff_t pos = page_offset(page) +
	89	(char ) de - (char ) page_address(page);
	90	unsigned len = fs16_to_cpu(dir->i_sb, de->d_reclen);
b71034e5	91	int err;
1da177e4	92
b71034e5	93	lock_page(page);
f4e420dc	94	err = ufs_prepare_chunk(page, pos, len);
b71034e5	95	BUG_ON(err);
82b9d1d0	96
b71034e5 ED	97	de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
b71034e5 ED	98	ufs_set_de_type(dir->i_sb, de, inode->i_mode);
82b9d1d0 NP	99
82b9d1d0 NP	100	err = ufs_commit_chunk(page, pos, len);
b71034e5	101	ufs_put_page(page);
70d45cdb	102	if (update_times)
02027d42	103	dir->i_mtime = dir->i_ctime = current_time(dir);
b71034e5 ED	104	mark_inode_dirty(dir);
b71034e5 ED	105	}
1da177e4	106
1da177e4	107
be5b82db	108	static bool ufs_check_page(struct page *page)
b71034e5 ED	109	{
	110	struct inode *dir = page->mapping->host;
	111	struct super_block *sb = dir->i_sb;
	112	char *kaddr = page_address(page);
	113	unsigned offs, rec_len;
09cbfeaf	114	unsigned limit = PAGE_SIZE;
f336953b	115	const unsigned chunk_mask = UFS_SB(sb)->s_uspi->s_dirblksize - 1;
b71034e5 ED	116	struct ufs_dir_entry *p;
	117	char *error;
	118
09cbfeaf KS	119	if ((dir->i_size >> PAGE_SHIFT) == page->index) {
09cbfeaf KS	120	limit = dir->i_size & ~PAGE_MASK;
f336953b	121	if (limit & chunk_mask)
b71034e5 ED	122	goto Ebadsize;
	123	if (!limit)
	124	goto out;
1da177e4	125	}
b71034e5 ED	126	for (offs = 0; offs <= limit - UFS_DIR_REC_LEN(1); offs += rec_len) {
	127	p = (struct ufs_dir_entry *)(kaddr + offs);
	128	rec_len = fs16_to_cpu(sb, p->d_reclen);
	129
	130	if (rec_len < UFS_DIR_REC_LEN(1))
	131	goto Eshort;
	132	if (rec_len & 3)
	133	goto Ealign;
	134	if (rec_len < UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, p)))
	135	goto Enamelen;
f336953b	136	if (((offs + rec_len - 1) ^ offs) & ~chunk_mask)
b71034e5 ED	137	goto Espan;
	138	if (fs32_to_cpu(sb, p->d_ino) > (UFS_SB(sb)->s_uspi->s_ipg *
	139	UFS_SB(sb)->s_uspi->s_ncg))
	140	goto Einumber;
	141	}
	142	if (offs != limit)
	143	goto Eend;
	144	out:
	145	SetPageChecked(page);
be5b82db	146	return true;
b71034e5 ED	147
	148	/* Too bad, we had an error */
	149
	150	Ebadsize:
	151	ufs_error(sb, "ufs_check_page",
	152	"size of directory #%lu is not a multiple of chunk size",
	153	dir->i_ino
	154	);
	155	goto fail;
	156	Eshort:
	157	error = "rec_len is smaller than minimal";
	158	goto bad_entry;
	159	Ealign:
	160	error = "unaligned directory entry";
	161	goto bad_entry;
	162	Enamelen:
	163	error = "rec_len is too small for name_len";
	164	goto bad_entry;
	165	Espan:
	166	error = "directory entry across blocks";
	167	goto bad_entry;
	168	Einumber:
	169	error = "inode out of bounds";
	170	bad_entry:
	171	ufs_error (sb, "ufs_check_page", "bad entry in directory #%lu: %s - "
	172	"offset=%lu, rec_len=%d, name_len=%d",
09cbfeaf	173	dir->i_ino, error, (page->index<<PAGE_SHIFT)+offs,
b71034e5 ED	174	rec_len, ufs_get_de_namlen(sb, p));
	175	goto fail;
	176	Eend:
	177	p = (struct ufs_dir_entry *)(kaddr + offs);
9746077a	178	ufs_error(sb, __func__,
b71034e5 ED	179	"entry in directory #%lu spans the page boundary"
b71034e5 ED	180	"offset=%lu",
09cbfeaf	181	dir->i_ino, (page->index<<PAGE_SHIFT)+offs);
b71034e5	182	fail:
b71034e5	183	SetPageError(page);
be5b82db	184	return false;
b71034e5	185	}
1da177e4	186
b71034e5 ED	187	static struct page ufs_get_page(struct inode dir, unsigned long n)
	188	{
	189	struct address_space *mapping = dir->i_mapping;
6fe6900e	190	struct page *page = read_mapping_page(mapping, n, NULL);
b71034e5	191	if (!IS_ERR(page)) {
b71034e5	192	kmap(page);
be5b82db AV	193	if (unlikely(!PageChecked(page))) {
	194	if (PageError(page) \|\| !ufs_check_page(page))
	195	goto fail;
	196	}
1da177e4	197	}
b71034e5	198	return page;
1da177e4	199
b71034e5 ED	200	fail:
	201	ufs_put_page(page);
	202	return ERR_PTR(-EIO);
1da177e4 LT	203	}
1da177e4 LT	204
b71034e5 ED	205	/*
	206	* Return the offset into page `page_nr' of the last valid
	207	* byte in that page, plus one.
	208	*/
	209	static unsigned
	210	ufs_last_byte(struct inode *inode, unsigned long page_nr)
1da177e4	211	{
b71034e5 ED	212	unsigned last_byte = inode->i_size;
b71034e5 ED	213
09cbfeaf KS	214	last_byte -= page_nr << PAGE_SHIFT;
	215	if (last_byte > PAGE_SIZE)
	216	last_byte = PAGE_SIZE;
b71034e5	217	return last_byte;
1da177e4 LT	218	}
1da177e4 LT	219
b71034e5 ED	220	static inline struct ufs_dir_entry *
b71034e5 ED	221	ufs_next_entry(struct super_block sb, struct ufs_dir_entry p)
1da177e4	222	{
b71034e5 ED	223	return (struct ufs_dir_entry )((char )p +
b71034e5 ED	224	fs16_to_cpu(sb, p->d_reclen));
1da177e4	225	}
b71034e5 ED	226
b71034e5 ED	227	struct ufs_dir_entry ufs_dotdot(struct inode dir, struct page **p)
1da177e4	228	{
b71034e5 ED	229	struct page *page = ufs_get_page(dir, 0);
b71034e5 ED	230	struct ufs_dir_entry *de = NULL;
1da177e4	231
b71034e5 ED	232	if (!IS_ERR(page)) {
	233	de = ufs_next_entry(dir->i_sb,
	234	(struct ufs_dir_entry *)page_address(page));
	235	*p = page;
1da177e4	236	}
b71034e5	237	return de;
1da177e4 LT	238	}
1da177e4 LT	239
b71034e5 ED	240	/*
	241	* ufs_find_entry()
	242	*
	243	* finds an entry in the specified directory with the wanted name. It
	244	* returns the page in which the entry was found, and the entry itself
	245	* (as a parameter - res_dir). Page is returned mapped and unlocked.
	246	* Entry is guaranteed to be valid.
	247	*/
89031bc7	248	struct ufs_dir_entry ufs_find_entry(struct inode dir, const struct qstr *qstr,
b71034e5	249	struct page **res_page)
1da177e4	250	{
b71034e5	251	struct super_block *sb = dir->i_sb;
89031bc7	252	const unsigned char *name = qstr->name;
08049707	253	int namelen = qstr->len;
b71034e5 ED	254	unsigned reclen = UFS_DIR_REC_LEN(namelen);
b71034e5 ED	255	unsigned long start, n;
5d754ced	256	unsigned long npages = dir_pages(dir);
b71034e5	257	struct page *page = NULL;
dd187a26	258	struct ufs_inode_info *ui = UFS_I(dir);
b71034e5 ED	259	struct ufs_dir_entry *de;
b71034e5 ED	260
abf5d15f	261	UFSD("ENTER, dir_ino %lu, name %s, namlen %u\n", dir->i_ino, name, namelen);
b71034e5 ED	262
	263	if (npages == 0 \|\| namelen > UFS_MAXNAMLEN)
	264	goto out;
	265
	266	/* OFFSET_CACHE */
	267	*res_page = NULL;
	268
dd187a26 ED	269	start = ui->i_dir_start_lookup;
dd187a26 ED	270
b71034e5 ED	271	if (start >= npages)
	272	start = 0;
	273	n = start;
	274	do {
	275	char *kaddr;
	276	page = ufs_get_page(dir, n);
	277	if (!IS_ERR(page)) {
	278	kaddr = page_address(page);
	279	de = (struct ufs_dir_entry *) kaddr;
	280	kaddr += ufs_last_byte(dir, n) - reclen;
	281	while ((char *) de <= kaddr) {
b71034e5 ED	282	if (ufs_match(sb, namelen, name, de))
	283	goto found;
	284	de = ufs_next_entry(sb, de);
	285	}
	286	ufs_put_page(page);
	287	}
	288	if (++n >= npages)
	289	n = 0;
	290	} while (n != start);
	291	out:
	292	return NULL;
	293
	294	found:
	295	*res_page = page;
dd187a26	296	ui->i_dir_start_lookup = n;
b71034e5	297	return de;
1da177e4 LT	298	}
	299
	300	/*
b71034e5	301	* Parent is locked.
1da177e4 LT	302	*/
	303	int ufs_add_link(struct dentry dentry, struct inode inode)
	304	{
2b0143b5	305	struct inode *dir = d_inode(dentry->d_parent);
89031bc7	306	const unsigned char *name = dentry->d_name.name;
1da177e4	307	int namelen = dentry->d_name.len;
b71034e5 ED	308	struct super_block *sb = dir->i_sb;
b71034e5 ED	309	unsigned reclen = UFS_DIR_REC_LEN(namelen);
f336953b	310	const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
b71034e5 ED	311	unsigned short rec_len, name_len;
	312	struct page *page = NULL;
	313	struct ufs_dir_entry *de;
5d754ced	314	unsigned long npages = dir_pages(dir);
b71034e5 ED	315	unsigned long n;
b71034e5 ED	316	char *kaddr;
82b9d1d0	317	loff_t pos;
1da177e4 LT	318	int err;
1da177e4 LT	319
abf5d15f	320	UFSD("ENTER, name %s, namelen %u\n", name, namelen);
b71034e5 ED	321
	322	/*
	323	* We take care of directory expansion in the same loop.
	324	* This code plays outside i_size, so it locks the page
	325	* to protect that region.
	326	*/
	327	for (n = 0; n <= npages; n++) {
	328	char *dir_end;
	329
	330	page = ufs_get_page(dir, n);
	331	err = PTR_ERR(page);
	332	if (IS_ERR(page))
	333	goto out;
	334	lock_page(page);
	335	kaddr = page_address(page);
	336	dir_end = kaddr + ufs_last_byte(dir, n);
	337	de = (struct ufs_dir_entry *)kaddr;
09cbfeaf	338	kaddr += PAGE_SIZE - reclen;
b71034e5 ED	339	while ((char *)de <= kaddr) {
	340	if ((char *)de == dir_end) {
	341	/* We hit i_size */
	342	name_len = 0;
f336953b ED	343	rec_len = chunk_size;
f336953b ED	344	de->d_reclen = cpu_to_fs16(sb, chunk_size);
b71034e5 ED	345	de->d_ino = 0;
b71034e5 ED	346	goto got_it;
1da177e4	347	}
b71034e5	348	if (de->d_reclen == 0) {
9746077a	349	ufs_error(dir->i_sb, __func__,
b71034e5 ED	350	"zero-length directory entry");
	351	err = -EIO;
	352	goto out_unlock;
	353	}
	354	err = -EEXIST;
	355	if (ufs_match(sb, namelen, name, de))
	356	goto out_unlock;
	357	name_len = UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de));
	358	rec_len = fs16_to_cpu(sb, de->d_reclen);
	359	if (!de->d_ino && rec_len >= reclen)
	360	goto got_it;
	361	if (rec_len >= name_len + reclen)
	362	goto got_it;
	363	de = (struct ufs_dir_entry ) ((char ) de + rec_len);
1da177e4	364	}
b71034e5 ED	365	unlock_page(page);
b71034e5 ED	366	ufs_put_page(page);
1da177e4	367	}
b71034e5 ED	368	BUG();
	369	return -EINVAL;
	370
	371	got_it:
82b9d1d0 NP	372	pos = page_offset(page) +
82b9d1d0 NP	373	(char)de - (char)page_address(page);
f4e420dc	374	err = ufs_prepare_chunk(page, pos, rec_len);
b71034e5 ED	375	if (err)
b71034e5 ED	376	goto out_unlock;
1da177e4	377	if (de->d_ino) {
b71034e5 ED	378	struct ufs_dir_entry *de1 =
	379	(struct ufs_dir_entry ) ((char ) de + name_len);
	380	de1->d_reclen = cpu_to_fs16(sb, rec_len - name_len);
	381	de->d_reclen = cpu_to_fs16(sb, name_len);
	382
1da177e4 LT	383	de = de1;
1da177e4 LT	384	}
b71034e5	385
1da177e4	386	ufs_set_de_namlen(sb, de, namelen);
b71034e5	387	memcpy(de->d_name, name, namelen + 1);
1da177e4 LT	388	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
1da177e4 LT	389	ufs_set_de_type(sb, de, inode->i_mode);
b71034e5	390
82b9d1d0	391	err = ufs_commit_chunk(page, pos, rec_len);
02027d42	392	dir->i_mtime = dir->i_ctime = current_time(dir);
b71034e5	393
1da177e4	394	mark_inode_dirty(dir);
b71034e5 ED	395	/* OFFSET_CACHE */
	396	out_put:
	397	ufs_put_page(page);
	398	out:
	399	return err;
	400	out_unlock:
	401	unlock_page(page);
	402	goto out_put;
	403	}
	404
	405	static inline unsigned
	406	ufs_validate_entry(struct super_block sb, char base,
	407	unsigned offset, unsigned mask)
	408	{
	409	struct ufs_dir_entry de = (struct ufs_dir_entry)(base + offset);
	410	struct ufs_dir_entry p = (struct ufs_dir_entry)(base + (offset&mask));
e0d508f1	411	while ((char)p < (char)de)
b71034e5	412	p = ufs_next_entry(sb, p);
b71034e5 ED	413	return (char *)p - base;
b71034e5 ED	414	}
1da177e4	415
b71034e5 ED	416
	417	/*
	418	* This is blatantly stolen from ext2fs
	419	*/
	420	static int
80886298	421	ufs_readdir(struct file file, struct dir_context ctx)
b71034e5	422	{
80886298 AV	423	loff_t pos = ctx->pos;
80886298 AV	424	struct inode *inode = file_inode(file);
b71034e5	425	struct super_block *sb = inode->i_sb;
09cbfeaf KS	426	unsigned int offset = pos & ~PAGE_MASK;
09cbfeaf KS	427	unsigned long n = pos >> PAGE_SHIFT;
5d754ced	428	unsigned long npages = dir_pages(inode);
f336953b	429	unsigned chunk_mask = ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
80886298	430	int need_revalidate = file->f_version != inode->i_version;
b71034e5 ED	431	unsigned flags = UFS_SB(sb)->s_flags;
b71034e5 ED	432
abf5d15f	433	UFSD("BEGIN\n");
b71034e5 ED	434
	435	if (pos > inode->i_size - UFS_DIR_REC_LEN(1))
	436	return 0;
	437
	438	for ( ; n < npages; n++, offset = 0) {
	439	char kaddr, limit;
	440	struct ufs_dir_entry *de;
	441
	442	struct page *page = ufs_get_page(inode, n);
	443
	444	if (IS_ERR(page)) {
9746077a	445	ufs_error(sb, __func__,
b71034e5 ED	446	"bad page in #%lu",
b71034e5 ED	447	inode->i_ino);
09cbfeaf	448	ctx->pos += PAGE_SIZE - offset;
b71034e5 ED	449	return -EIO;
	450	}
	451	kaddr = page_address(page);
	452	if (unlikely(need_revalidate)) {
	453	if (offset) {
	454	offset = ufs_validate_entry(sb, kaddr, offset, chunk_mask);
09cbfeaf	455	ctx->pos = (n<<PAGE_SHIFT) + offset;
b71034e5	456	}
80886298	457	file->f_version = inode->i_version;
b71034e5 ED	458	need_revalidate = 0;
	459	}
	460	de = (struct ufs_dir_entry *)(kaddr+offset);
	461	limit = kaddr + ufs_last_byte(inode, n) - UFS_DIR_REC_LEN(1);
	462	for ( ;(char*)de <= limit; de = ufs_next_entry(sb, de)) {
b71034e5	463	if (de->d_ino) {
b71034e5 ED	464	unsigned char d_type = DT_UNKNOWN;
b71034e5 ED	465
abf5d15f ED	466	UFSD("filldir(%s,%u)\n", de->d_name,
	467	fs32_to_cpu(sb, de->d_ino));
	468	UFSD("namlen %u\n", ufs_get_de_namlen(sb, de));
b71034e5 ED	469
	470	if ((flags & UFS_DE_MASK) == UFS_DE_44BSD)
	471	d_type = de->d_u.d_44.d_type;
	472
80886298	473	if (!dir_emit(ctx, de->d_name,
b71034e5	474	ufs_get_de_namlen(sb, de),
80886298 AV	475	fs32_to_cpu(sb, de->d_ino),
80886298 AV	476	d_type)) {
b71034e5 ED	477	ufs_put_page(page);
	478	return 0;
	479	}
	480	}
80886298	481	ctx->pos += fs16_to_cpu(sb, de->d_reclen);
b71034e5 ED	482	}
	483	ufs_put_page(page);
	484	}
1da177e4 LT	485	return 0;
	486	}
	487
b71034e5	488
1da177e4 LT	489	/*
	490	* ufs_delete_entry deletes a directory entry by merging it with the
	491	* previous entry.
	492	*/
b71034e5 ED	493	int ufs_delete_entry(struct inode inode, struct ufs_dir_entry dir,
b71034e5 ED	494	struct page * page)
1da177e4	495	{
b71034e5	496	struct super_block *sb = inode->i_sb;
b71034e5	497	char *kaddr = page_address(page);
f336953b	498	unsigned from = ((char*)dir - kaddr) & ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
b71034e5	499	unsigned to = ((char*)dir - kaddr) + fs16_to_cpu(sb, dir->d_reclen);
82b9d1d0	500	loff_t pos;
b71034e5 ED	501	struct ufs_dir_entry *pde = NULL;
	502	struct ufs_dir_entry de = (struct ufs_dir_entry ) (kaddr + from);
	503	int err;
1da177e4	504
abf5d15f	505	UFSD("ENTER\n");
1da177e4	506
abf5d15f	507	UFSD("ino %u, reclen %u, namlen %u, name %s\n",
b71034e5 ED	508	fs32_to_cpu(sb, de->d_ino),
b71034e5 ED	509	fs16_to_cpu(sb, de->d_reclen),
abf5d15f	510	ufs_get_de_namlen(sb, de), de->d_name);
b71034e5 ED	511
	512	while ((char)de < (char)dir) {
	513	if (de->d_reclen == 0) {
9746077a	514	ufs_error(inode->i_sb, __func__,
b71034e5 ED	515	"zero-length directory entry");
	516	err = -EIO;
	517	goto out;
1da177e4	518	}
b71034e5 ED	519	pde = de;
b71034e5 ED	520	de = ufs_next_entry(sb, de);
1da177e4	521	}
b71034e5 ED	522	if (pde)
b71034e5 ED	523	from = (char)pde - (char)page_address(page);
82b9d1d0 NP	524
82b9d1d0 NP	525	pos = page_offset(page) + from;
b71034e5	526	lock_page(page);
f4e420dc	527	err = ufs_prepare_chunk(page, pos, to - from);
b71034e5 ED	528	BUG_ON(err);
b71034e5 ED	529	if (pde)
82b9d1d0	530	pde->d_reclen = cpu_to_fs16(sb, to - from);
b71034e5	531	dir->d_ino = 0;
82b9d1d0	532	err = ufs_commit_chunk(page, pos, to - from);
02027d42	533	inode->i_ctime = inode->i_mtime = current_time(inode);
b71034e5 ED	534	mark_inode_dirty(inode);
	535	out:
	536	ufs_put_page(page);
abf5d15f	537	UFSD("EXIT\n");
b71034e5	538	return err;
1da177e4 LT	539	}
	540
	541	int ufs_make_empty(struct inode * inode, struct inode *dir)
	542	{
	543	struct super_block * sb = dir->i_sb;
b71034e5 ED	544	struct address_space *mapping = inode->i_mapping;
b71034e5 ED	545	struct page *page = grab_cache_page(mapping, 0);
f336953b	546	const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
1da177e4	547	struct ufs_dir_entry * de;
b71034e5	548	char *base;
1da177e4 LT	549	int err;
1da177e4 LT	550
b71034e5 ED	551	if (!page)
b71034e5 ED	552	return -ENOMEM;
82b9d1d0	553
f4e420dc	554	err = ufs_prepare_chunk(page, 0, chunk_size);
b71034e5 ED	555	if (err) {
	556	unlock_page(page);
	557	goto fail;
	558	}
	559
82b9d1d0	560	kmap(page);
b71034e5	561	base = (char*)page_address(page);
09cbfeaf	562	memset(base, 0, PAGE_SIZE);
b71034e5 ED	563
b71034e5 ED	564	de = (struct ufs_dir_entry *) base;
1da177e4	565
1da177e4 LT	566	de->d_ino = cpu_to_fs32(sb, inode->i_ino);
	567	ufs_set_de_type(sb, de, inode->i_mode);
	568	ufs_set_de_namlen(sb, de, 1);
	569	de->d_reclen = cpu_to_fs16(sb, UFS_DIR_REC_LEN(1));
	570	strcpy (de->d_name, ".");
	571	de = (struct ufs_dir_entry *)
	572	((char *)de + fs16_to_cpu(sb, de->d_reclen));
	573	de->d_ino = cpu_to_fs32(sb, dir->i_ino);
	574	ufs_set_de_type(sb, de, dir->i_mode);
f336953b	575	de->d_reclen = cpu_to_fs16(sb, chunk_size - UFS_DIR_REC_LEN(1));
1da177e4 LT	576	ufs_set_de_namlen(sb, de, 2);
1da177e4 LT	577	strcpy (de->d_name, "..");
82b9d1d0	578	kunmap(page);
b71034e5	579
f336953b	580	err = ufs_commit_chunk(page, 0, chunk_size);
b71034e5	581	fail:
09cbfeaf	582	put_page(page);
b71034e5	583	return err;
1da177e4 LT	584	}
	585
	586	/*
	587	* routine to check that the specified directory is empty (for rmdir)
	588	*/
b71034e5	589	int ufs_empty_dir(struct inode * inode)
1da177e4	590	{
b71034e5 ED	591	struct super_block *sb = inode->i_sb;
b71034e5 ED	592	struct page *page = NULL;
5d754ced	593	unsigned long i, npages = dir_pages(inode);
b71034e5 ED	594
	595	for (i = 0; i < npages; i++) {
	596	char *kaddr;
	597	struct ufs_dir_entry *de;
	598	page = ufs_get_page(inode, i);
	599
	600	if (IS_ERR(page))
	601	continue;
	602
	603	kaddr = page_address(page);
	604	de = (struct ufs_dir_entry *)kaddr;
	605	kaddr += ufs_last_byte(inode, i) - UFS_DIR_REC_LEN(1);
	606
	607	while ((char *)de <= kaddr) {
	608	if (de->d_reclen == 0) {
9746077a	609	ufs_error(inode->i_sb, __func__,
b71034e5 ED	610	"zero-length directory entry: "
	611	"kaddr=%p, de=%p\n", kaddr, de);
	612	goto not_empty;
1da177e4	613	}
b71034e5 ED	614	if (de->d_ino) {
	615	u16 namelen=ufs_get_de_namlen(sb, de);
	616	/* check for . and .. */
	617	if (de->d_name[0] != '.')
	618	goto not_empty;
	619	if (namelen > 2)
	620	goto not_empty;
	621	if (namelen < 2) {
	622	if (inode->i_ino !=
	623	fs32_to_cpu(sb, de->d_ino))
	624	goto not_empty;
	625	} else if (de->d_name[1] != '.')
	626	goto not_empty;
	627	}
	628	de = ufs_next_entry(sb, de);
1da177e4	629	}
b71034e5	630	ufs_put_page(page);
1da177e4	631	}
1da177e4	632	return 1;
b71034e5 ED	633
	634	not_empty:
	635	ufs_put_page(page);
	636	return 0;
1da177e4 LT	637	}
1da177e4 LT	638
4b6f5d20	639	const struct file_operations ufs_dir_operations = {
1da177e4	640	.read = generic_read_dir,
3b0a3c1a	641	.iterate_shared = ufs_readdir,
1b061d92	642	.fsync = generic_file_fsync,
3222a3e5	643	.llseek = generic_file_llseek,
1da177e4	644	};