1/* vi: set sw=4 ts=4: */ 2/* 3 * valid_blk.c --- does the inode have valid blocks? 4 * 5 * Copyright 1997 by Theodore Ts'o 6 * 7 * %Begin-Header% 8 * This file may be redistributed under the terms of the GNU Public 9 * License. 10 * %End-Header% 11 * 12 */ 13 14#include <stdio.h> 15#if HAVE_UNISTD_H 16#include <unistd.h> 17#endif 18#include <string.h> 19#include <time.h> 20 21#include "ext2_fs.h" 22#include "ext2fs.h" 23 24/* 25 * This function returns 1 if the inode's block entries actually 26 * contain block entries. 27 */ 28int ext2fs_inode_has_valid_blocks(struct ext2_inode *inode) 29{ 30 /* 31 * Only directories, regular files, and some symbolic links 32 * have valid block entries. 33 */ 34 if (!LINUX_S_ISDIR(inode->i_mode) && !LINUX_S_ISREG(inode->i_mode) && 35 !LINUX_S_ISLNK(inode->i_mode)) 36 return 0; 37 38 /* 39 * If the symbolic link is a "fast symlink", then the symlink 40 * target is stored in the block entries. 41 */ 42 if (LINUX_S_ISLNK (inode->i_mode)) { 43 if (inode->i_file_acl == 0) { 44 /* With no EA block, we can rely on i_blocks */ 45 if (inode->i_blocks == 0) 46 return 0; 47 } else { 48 /* With an EA block, life gets more tricky */ 49 if (inode->i_size >= EXT2_N_BLOCKS*4) 50 return 1; /* definitely using i_block[] */ 51 if (inode->i_size > 4 && inode->i_block[1] == 0) 52 return 1; /* definitely using i_block[] */ 53 return 0; /* Probably a fast symlink */ 54 } 55 } 56 return 1; 57} 58