Release 4.18 fs/udf/symlink.c

/*
 * symlink.c
 *
 * PURPOSE
 *      Symlink handling routines for the OSTA-UDF(tm) filesystem.
 *
 * COPYRIGHT
 *      This file is distributed under the terms of the GNU General Public
 *      License (GPL). Copies of the GPL can be obtained from:
 *              ftp://prep.ai.mit.edu/pub/gnu/GPL
 *      Each contributing author retains all rights to their own work.
 *
 *  (C) 1998-2001 Ben Fennema
 *  (C) 1999 Stelias Computing Inc
 *
 * HISTORY
 *
 *  04/16/99 blf  Created.
 *
 */

#include "udfdecl.h"
#include <linux/uaccess.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/stat.h>
#include <linux/pagemap.h>
#include "udf_i.h"



static int udf_pc_to_char(struct super_block *sb, unsigned char *from,
			  int fromlen, unsigned char *to, int tolen)
{
	struct pathComponent *pc;
	int elen = 0;
	int comp_len;
	unsigned char *p = to;

	/* Reserve one byte for terminating \0 */
	tolen--;
	while (elen < fromlen) {
		pc = (struct pathComponent *)(from + elen);
		elen += sizeof(struct pathComponent);
		switch (pc->componentType) {
		case 1:
			/*
                         * Symlink points to some place which should be agreed
                         * upon between originator and receiver of the media. Ignore.
                         */
			if (pc->lengthComponentIdent > 0) {
				elen += pc->lengthComponentIdent;
				break;
			}
			/* Fall through */
		case 2:
			if (tolen == 0)
				return -ENAMETOOLONG;
			p = to;
			*p++ = '/';
			tolen--;
			break;
		case 3:
			if (tolen < 3)
				return -ENAMETOOLONG;
			memcpy(p, "../", 3);
			p += 3;
			tolen -= 3;
			break;
		case 4:
			if (tolen < 2)
				return -ENAMETOOLONG;
			memcpy(p, "./", 2);
			p += 2;
			tolen -= 2;
			/* that would be . - just ignore */
			break;
		case 5:
			elen += pc->lengthComponentIdent;
			if (elen > fromlen)
				return -EIO;
			comp_len = udf_get_filename(sb, pc->componentIdent,
						    pc->lengthComponentIdent,
						    p, tolen);
			if (comp_len < 0)
				return comp_len;

			p += comp_len;
			tolen -= comp_len;
			if (tolen == 0)
				return -ENAMETOOLONG;
			*p++ = '/';
			tolen--;
			break;
		}
	}
	if (p > to + 1)
		p[-1] = '\0';
	else
		p[0] = '\0';
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
157
51.99%
3
30.00%
Jan Kara
121
40.07%
3
30.00%
Ben Fennema
12
3.97%
2
20.00%
Fabian Frederick
9
2.98%
1
10.00%
Al Viro
3
0.99%
1
10.00%
Total
302
100.00%
10
100.00%



static int udf_symlink_filler(struct file *file, struct page *page)
{
	struct inode *inode = page->mapping->host;
	struct buffer_head *bh = NULL;
	unsigned char *symlink;
	int err;
	unsigned char *p = page_address(page);
	struct udf_inode_info *iinfo;
	uint32_t pos;

	/* We don't support symlinks longer than one block */
	if (inode->i_size > inode->i_sb->s_blocksize) {
		err = -ENAMETOOLONG;
		goto out_unmap;
	}

	iinfo = UDF_I(inode);
	pos = udf_block_map(inode, 0);

	down_read(&iinfo->i_data_sem);
	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
		symlink = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
	} else {
		bh = sb_bread(inode->i_sb, pos);

		if (!bh) {
			err = -EIO;
			goto out_unlock_inode;
		}

		symlink = bh->b_data;
	}

	err = udf_pc_to_char(inode->i_sb, symlink, inode->i_size, p, PAGE_SIZE);
	brelse(bh);
	if (err)
		goto out_unlock_inode;

	up_read(&iinfo->i_data_sem);
	SetPageUptodate(page);
	unlock_page(page);
	return 0;

out_unlock_inode:
	up_read(&iinfo->i_data_sem);
	SetPageError(page);
out_unmap:
	unlock_page(page);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
123
51.04%
5
27.78%
Jan Kara
46
19.09%
3
16.67%
Alessio Igor Bogani
35
14.52%
1
5.56%
Marcin Ślusarz
22
9.13%
2
11.11%
Ben Fennema
6
2.49%
2
11.11%
Al Viro
3
1.24%
2
11.11%
Andrew Morton
2
0.83%
1
5.56%
Cyrill V. Gorcunov
2
0.83%
1
5.56%
Linus Torvalds
2
0.83%
1
5.56%
Total
241
100.00%
18
100.00%



static int udf_symlink_getattr(const struct path *path, struct kstat *stat,
				u32 request_mask, unsigned int flags)
{
	struct dentry *dentry = path->dentry;
	struct inode *inode = d_backing_inode(dentry);
	struct page *page;

	generic_fillattr(inode, stat);
	page = read_mapping_page(inode->i_mapping, 0, NULL);
	if (IS_ERR(page))
		return PTR_ERR(page);
	/*
         * UDF uses non-trivial encoding of symlinks so i_size does not match
         * number of characters reported by readlink(2) which apparently some
         * applications expect. Also POSIX says that "The value returned in the
         * st_size field shall be the length of the contents of the symbolic
         * link, and shall not count a trailing null if one is present." So
         * let's report the length of string returned by readlink(2) for
         * st_size.
         */
	stat->size = strlen(page_address(page));
	put_page(page);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
83
81.37%
1
50.00%
David Howells
19
18.63%
1
50.00%
Total
102
100.00%
2
100.00%

/*
 * symlinks can't do much...
 */

const struct address_space_operations udf_symlink_aops = {
	.readpage		= udf_symlink_filler,
};


const struct inode_operations udf_symlink_inode_operations = {
	.get_link	= page_get_link,
	.getattr	= udf_symlink_getattr,
};
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
315
44.81%
6
21.43%
Jan Kara
267
37.98%
6
21.43%
Alessio Igor Bogani
35
4.98%
1
3.57%
Marcin Ślusarz
22
3.13%
2
7.14%
David Howells
19
2.70%
1
3.57%
Ben Fennema
18
2.56%
2
7.14%
Fabian Frederick
10
1.42%
2
7.14%
Al Viro
6
0.85%
2
7.14%
Cyrill V. Gorcunov
3
0.43%
1
3.57%
Andrew Morton
2
0.28%
1
3.57%
Linus Torvalds
2
0.28%
1
3.57%
Art Haas
2
0.28%
1
3.57%
Christoph Hellwig
1
0.14%
1
3.57%
Dave Jones
1
0.14%
1
3.57%
Total
703
100.00%
28
100.00%
Directory: fs/udf

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