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