1 /* 2 * read_bb --- read the bad blocks inode 3 * 4 * Copyright (C) 1994 Theodore Ts'o. 5 * 6 * %Begin-Header% 7 * This file may be redistributed under the terms of the GNU Library 8 * General Public License, version 2. 9 * %End-Header% 10 */ 11 12 #include "config.h" 13 #include <stdio.h> 14 #include <string.h> 15 #if HAVE_UNISTD_H 16 #include <unistd.h> 17 #endif 18 #include <fcntl.h> 19 #include <time.h> 20 #if HAVE_SYS_STAT_H 21 #include <sys/stat.h> 22 #endif 23 #if HAVE_SYS_TYPES_H 24 #include <sys/types.h> 25 #endif 26 27 #include "ext2_fs.h" 28 #include "ext2fs.h" 29 30 struct read_bb_record { 31 ext2_badblocks_list bb_list; 32 errcode_t err; 33 }; 34 35 /* 36 * Helper function for ext2fs_read_bb_inode() 37 */ 38 #ifdef __TURBOC__ 39 #pragma argsused 40 #endif 41 static int mark_bad_block(ext2_filsys fs, blk_t *block_nr, 42 e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)), 43 blk_t ref_block EXT2FS_ATTR((unused)), 44 int ref_offset EXT2FS_ATTR((unused)), 45 void *priv_data) 46 { 47 struct read_bb_record *rb = (struct read_bb_record *) priv_data; 48 49 if (blockcnt < 0) 50 return 0; 51 52 if ((*block_nr < fs->super->s_first_data_block) || 53 (*block_nr >= ext2fs_blocks_count(fs->super))) 54 return 0; /* Ignore illegal blocks */ 55 56 rb->err = ext2fs_badblocks_list_add(rb->bb_list, *block_nr); 57 if (rb->err) 58 return BLOCK_ABORT; 59 return 0; 60 } 61 62 /* 63 * Reads the current bad blocks from the bad blocks inode. 64 */ 65 errcode_t ext2fs_read_bb_inode(ext2_filsys fs, ext2_badblocks_list *bb_list) 66 { 67 errcode_t retval; 68 struct read_bb_record rb; 69 struct ext2_inode inode; 70 blk_t numblocks; 71 72 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 73 74 if (!*bb_list) { 75 retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode); 76 if (retval) 77 return retval; 78 numblocks = inode.i_blocks; 79 if (!(ext2fs_has_feature_huge_file(fs->super) && 80 (inode.i_flags & EXT4_HUGE_FILE_FL))) 81 numblocks = numblocks / (fs->blocksize / 512); 82 numblocks += 20; 83 if (numblocks < 50) 84 numblocks = 50; 85 if (numblocks > 50000) 86 numblocks = 500; 87 retval = ext2fs_badblocks_list_create(bb_list, numblocks); 88 if (retval) 89 return retval; 90 } 91 92 rb.bb_list = *bb_list; 93 rb.err = 0; 94 retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO, BLOCK_FLAG_READ_ONLY, 95 0, mark_bad_block, &rb); 96 if (retval) 97 return retval; 98 99 return rb.err; 100 } 101 102 103
