51 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * symlink.c4 *5 * Copyright (c) 1999 Al Smith6 *7 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.8 */9 10#include <linux/string.h>11#include <linux/pagemap.h>12#include <linux/buffer_head.h>13#include "efs.h"14 15static int efs_symlink_read_folio(struct file *file, struct folio *folio)16{17 char *link = folio_address(folio);18 struct buffer_head *bh;19 struct inode *inode = folio->mapping->host;20 efs_block_t size = inode->i_size;21 int err;22 23 err = -ENAMETOOLONG;24 if (size > 2 * EFS_BLOCKSIZE)25 goto fail;26 27 /* read first 512 bytes of link target */28 err = -EIO;29 bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));30 if (!bh)31 goto fail;32 memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);33 brelse(bh);34 if (size > EFS_BLOCKSIZE) {35 bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));36 if (!bh)37 goto fail;38 memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);39 brelse(bh);40 }41 link[size] = '\0';42 err = 0;43fail:44 folio_end_read(folio, err == 0);45 return err;46}47 48const struct address_space_operations efs_symlink_aops = {49 .read_folio = efs_symlink_read_folio50};51