/* * 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 };