[net-next-2.6.git] / fs / efs / symlink.c

/*
 * symlink.c
 *
 * Copyright (c) 1999 Al Smith
 *
 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
 */

#include <linux/string.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include "efs.h"

static int efs_symlink_readpage(struct file *file, struct page *page)
{
	char *link = kmap(page);
	struct buffer_head * bh;
	struct inode * inode = page->mapping->host;
	efs_block_t size = inode->i_size;
	int err;
  
	err = -ENAMETOOLONG;
	if (size > 2 * EFS_BLOCKSIZE)
		goto fail;
  
	/* read first 512 bytes of link target */
	err = -EIO;
	bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
	if (!bh)
		goto fail;
	memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
	brelse(bh);
	if (size > EFS_BLOCKSIZE) {
		bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
		if (!bh)
			goto fail;
		memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
		brelse(bh);
	}
	link[size] = '\0';
	SetPageUptodate(page);
	kunmap(page);
	unlock_page(page);
	return 0;
fail:
	SetPageError(page);
	kunmap(page);
	unlock_page(page);
	return err;
}

const struct address_space_operations efs_symlink_aops = {
	.readpage	= efs_symlink_readpage
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* symlink.c
	3	*
	4	* Copyright (c) 1999 Al Smith
	5	*
	6	* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
	7	*/
	8
	9	#include <linux/string.h>
1da177e4 LT	10	#include <linux/pagemap.h>
1da177e4 LT	11	#include <linux/buffer_head.h>
45254b4f	12	#include "efs.h"
1da177e4 LT	13
	14	static int efs_symlink_readpage(struct file file, struct page page)
	15	{
	16	char *link = kmap(page);
	17	struct buffer_head * bh;
	18	struct inode * inode = page->mapping->host;
	19	efs_block_t size = inode->i_size;
	20	int err;
	21
	22	err = -ENAMETOOLONG;
	23	if (size > 2 * EFS_BLOCKSIZE)
e7ec952f	24	goto fail;
1da177e4	25
1da177e4 LT	26	/* read first 512 bytes of link target */
	27	err = -EIO;
	28	bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
	29	if (!bh)
	30	goto fail;
	31	memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
	32	brelse(bh);
	33	if (size > EFS_BLOCKSIZE) {
	34	bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
	35	if (!bh)
	36	goto fail;
	37	memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
	38	brelse(bh);
	39	}
	40	link[size] = '\0';
1da177e4 LT	41	SetPageUptodate(page);
	42	kunmap(page);
	43	unlock_page(page);
	44	return 0;
	45	fail:
1da177e4 LT	46	SetPageError(page);
	47	kunmap(page);
	48	unlock_page(page);
	49	return err;
	50	}
	51
f5e54d6e	52	const struct address_space_operations efs_symlink_aops = {
1da177e4 LT	53	.readpage = efs_symlink_readpage
1da177e4 LT	54	};