Release 4.18 fs/ufs/dir.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  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 <linux/iversion.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);
}

Contributors
Person
Tokens
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Commits
CommitProp
Linus Torvalds
62
98.41%
2
66.67%
Al Viro
1
1.59%
1
33.33%
Total
63
100.00%
3
100.00%



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;

	inode_inc_iversion(dir);
	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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicholas Piggin
47
42.34%
1
12.50%
Evgeniy Dushistov
33
29.73%
1
12.50%
Linus Torvalds (pre-git)
25
22.52%
3
37.50%
Jeff Layton
3
2.70%
1
12.50%
Dave Jones
2
1.80%
1
12.50%
Dave Hansen
1
0.90%
1
12.50%
Total
111
100.00%
8
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
19
86.36%
1
33.33%
Linus Torvalds (pre-git)
2
9.09%
1
33.33%
Kirill A. Shutemov
1
4.55%
1
33.33%
Total
22
100.00%
3
100.00%



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;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
49
70.00%
1
20.00%
Linus Torvalds (pre-git)
17
24.29%
2
40.00%
Alexey Dobriyan
3
4.29%
1
20.00%
Al Viro
1
1.43%
1
20.00%
Total
70
100.00%
5
100.00%

/* 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);
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
94
60.65%
1
10.00%
Linus Torvalds (pre-git)
34
21.94%
4
40.00%
Nicholas Piggin
12
7.74%
1
10.00%
Al Viro
7
4.52%
1
10.00%
Deepa Dinamani
4
2.58%
1
10.00%
Linus Torvalds
3
1.94%
1
10.00%
Christoph Hellwig
1
0.65%
1
10.00%
Total
155
100.00%
10
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
402
95.26%
2
33.33%
Linus Torvalds (pre-git)
7
1.66%
1
16.67%
Al Viro
7
1.66%
1
16.67%
Kirill A. Shutemov
5
1.18%
1
16.67%
Harvey Harrison
1
0.24%
1
16.67%
Total
422
100.00%
6
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
89
88.12%
1
33.33%
Al Viro
11
10.89%
1
33.33%
Nicholas Piggin
1
0.99%
1
33.33%
Total
101
100.00%
3
100.00%

/*
 * 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
38
92.68%
1
50.00%
Kirill A. Shutemov
3
7.32%
1
50.00%
Total
41
100.00%
2
100.00%


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));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
33
78.57%
1
20.00%
Linus Torvalds (pre-git)
6
14.29%
3
60.00%
Linus Torvalds
3
7.14%
1
20.00%
Total
42
100.00%
5
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
51
68.92%
1
16.67%
Linus Torvalds (pre-git)
23
31.08%
5
83.33%
Total
74
100.00%
6
100.00%

/*
 *      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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
147
52.31%
3
33.33%
Linus Torvalds
101
35.94%
2
22.22%
Linus Torvalds (pre-git)
26
9.25%
1
11.11%
Alexey Dobriyan
4
1.42%
1
11.11%
Al Viro
2
0.71%
1
11.11%
Fabian Frederick
1
0.36%
1
11.11%
Total
281
100.00%
9
100.00%

/*
 *      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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
434
73.06%
3
21.43%
Linus Torvalds
134
22.56%
2
14.29%
Nicholas Piggin
12
2.02%
1
7.14%
Deepa Dinamani
4
0.67%
1
7.14%
David Howells
3
0.51%
1
7.14%
Dave Jones
2
0.34%
1
7.14%
Harvey Harrison
1
0.17%
1
7.14%
Fabian Frederick
1
0.17%
1
7.14%
Christoph Hellwig
1
0.17%
1
7.14%
Kirill A. Shutemov
1
0.17%
1
7.14%
Al Viro
1
0.17%
1
7.14%
Total
594
100.00%
14
100.00%


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;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
76
84.44%
1
50.00%
Linus Torvalds
14
15.56%
1
50.00%
Total
90
100.00%
2
100.00%

/*
 * 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);
	bool need_revalidate = !inode_eq_iversion(inode, file->f_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_query_iversion(inode);
			need_revalidate = false;
		}
		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;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
236
53.76%
3
23.08%
Linus Torvalds
160
36.45%
2
15.38%
Al Viro
23
5.24%
2
15.38%
Jeff Layton
9
2.05%
1
7.69%
Kirill A. Shutemov
4
0.91%
1
7.69%
Dave Jones
3
0.68%
1
7.69%
Goffredo Baroncelli
2
0.46%
1
7.69%
Harvey Harrison
1
0.23%
1
7.69%
Fabian Frederick
1
0.23%
1
7.69%
Total
439
100.00%
13
100.00%

/*
 * 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
221
65.97%
3
33.33%
Linus Torvalds
89
26.57%
2
22.22%
Nicholas Piggin
18
5.37%
1
11.11%
Deepa Dinamani
4
1.19%
1
11.11%
Christoph Hellwig
2
0.60%
1
11.11%
Harvey Harrison
1
0.30%
1
11.11%
Total
335
100.00%
9
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
197
65.02%
2
25.00%
Evgeniy Dushistov
90
29.70%
2
25.00%
Nicholas Piggin
10
3.30%
1
12.50%
Linus Torvalds (pre-git)
2
0.66%
1
12.50%
Christoph Hellwig
2
0.66%
1
12.50%
Kirill A. Shutemov
2
0.66%
1
12.50%
Total
303
100.00%
8
100.00%

/*
 * 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
157
60.62%
1
14.29%
Linus Torvalds
71
27.41%
2
28.57%
Linus Torvalds (pre-git)
29
11.20%
2
28.57%
Fabian Frederick
1
0.39%
1
14.29%
Harvey Harrison
1
0.39%
1
14.29%
Total
259
100.00%
7
100.00%


const struct file_operations ufs_dir_operations = {
	.read		= generic_read_dir,
	.iterate_shared	= ufs_readdir,
	.fsync		= generic_file_fsync,
	.llseek		= generic_file_llseek,
};
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Evgeniy Dushistov
2175
62.81%
4
8.70%
Linus Torvalds
839
24.23%
2
4.35%
Linus Torvalds (pre-git)
195
5.63%
13
28.26%
Nicholas Piggin
102
2.95%
2
4.35%
Al Viro
54
1.56%
6
13.04%
Kirill A. Shutemov
16
0.46%
1
2.17%
Jeff Layton
15
0.43%
1
2.17%
Christoph Hellwig
15
0.43%
4
8.70%
Deepa Dinamani
12
0.35%
1
2.17%
Dave Jones
8
0.23%
2
4.35%
Alexey Dobriyan
7
0.20%
1
2.17%
Art Haas
6
0.17%
1
2.17%
Harvey Harrison
5
0.14%
1
2.17%
Fabian Frederick
4
0.12%
1
2.17%
David Howells
3
0.09%
1
2.17%
Goffredo Baroncelli
2
0.06%
1
2.17%
Mike Frysinger
2
0.06%
1
2.17%
Dave Hansen
1
0.03%
1
2.17%
Greg Kroah-Hartman
1
0.03%
1
2.17%
Arjan van de Ven
1
0.03%
1
2.17%
Total
3463
100.00%
46
100.00%
Directory: fs/ufs

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