55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* 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_read_folio(struct file *file, struct folio *folio)
|
||
|
|
{
|
||
|
|
struct page *page = &folio->page;
|
||
|
|
char *link = page_address(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);
|
||
|
|
unlock_page(page);
|
||
|
|
return 0;
|
||
|
|
fail:
|
||
|
|
SetPageError(page);
|
||
|
|
unlock_page(page);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
const struct address_space_operations efs_symlink_aops = {
|
||
|
|
.read_folio = efs_symlink_read_folio
|
||
|
|
};
|