Viewing file:  symlink.c (1.2 KB) -rw-r--r--
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/*
* 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/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;
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);
UnlockPage(page);
return 0;
fail:
unlock_kernel();
SetPageError(page);
kunmap(page);
UnlockPage(page);
return err;
}
struct address_space_operations efs_symlink_aops = {
readpage: efs_symlink_readpage
};
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