[linux.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/efs_fs.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include <linux/smp_lock.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_notlocked;
  
	lock_kernel();
	/* 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';
	unlock_kernel();
	SetPageUptodate(page);
	kunmap(page);
	unlock_page(page);
	return 0;
fail:
	unlock_kernel();
fail_notlocked:
	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>
	10	#include <linux/efs_fs.h>
	11	#include <linux/pagemap.h>
	12	#include <linux/buffer_head.h>
	13	#include <linux/smp_lock.h>
	14
	15	static int efs_symlink_readpage(struct file file, struct page page)
	16	{
	17	char *link = kmap(page);
	18	struct buffer_head * bh;
	19	struct inode * inode = page->mapping->host;
	20	efs_block_t size = inode->i_size;
	21	int err;
	22
	23	err = -ENAMETOOLONG;
	24	if (size > 2 * EFS_BLOCKSIZE)
0aa9e4f1	25	goto fail_notlocked;
1da177e4 LT	26
	27	lock_kernel();
	28	/* read first 512 bytes of link target */
	29	err = -EIO;
	30	bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
	31	if (!bh)
	32	goto fail;
	33	memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
	34	brelse(bh);
	35	if (size > EFS_BLOCKSIZE) {
	36	bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
	37	if (!bh)
	38	goto fail;
	39	memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
	40	brelse(bh);
	41	}
	42	link[size] = '\0';
	43	unlock_kernel();
	44	SetPageUptodate(page);
	45	kunmap(page);
	46	unlock_page(page);
	47	return 0;
	48	fail:
	49	unlock_kernel();
0aa9e4f1	50	fail_notlocked:
1da177e4 LT	51	SetPageError(page);
	52	kunmap(page);
	53	unlock_page(page);
	54	return err;
	55	}
	56
f5e54d6e	57	const struct address_space_operations efs_symlink_aops = {
1da177e4 LT	58	.readpage = efs_symlink_readpage
1da177e4 LT	59	};