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 <stdio.h> 13 #include <string.h> 14 #if HAVE_UNISTD_H 15 #include <unistd.h> 16 #endif 17 #include <fcntl.h> 18 #include <time.h> 19 #if HAVE_SYS_STAT_H 20 #include <sys/stat.h> 21 #endif 22 #if HAVE_SYS_TYPES_H 23 #include <sys/types.h> 24 #endif 25 26 #include "ext2_fs.h" 27 #include "ext2fs.h" 28 29 struct read_bb_record { 30 ext2_badblocks_list bb_list; 31 errcode_t err; 32 }; 33 34 /* 35 * Helper function for ext2fs_read_bb_inode() 36 */ 37 #ifdef __TURBOC__ 38 #pragma argsused 39 #endif 40 static int mark_bad_block(ext2_filsys fs, blk_t *block_nr, 41 e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)), 42 blk_t ref_block EXT2FS_ATTR((unused)), 43 int ref_offset EXT2FS_ATTR((unused)), 44 void *priv_data) 45 { 46 struct read_bb_record *rb = (struct read_bb_record *) priv_data; 47 48 if (blockcnt < 0) 49 return 0; 50 51 if ((*block_nr < fs->super->s_first_data_block) || 52 (*block_nr >= ext2fs_blocks_count(fs->super))) 53 return 0; /* Ignore illegal blocks */ 54 55 rb->err = ext2fs_badblocks_list_add(rb->bb_list, *block_nr); 56 if (rb->err) 57 return BLOCK_ABORT; 58 return 0; 59 } 60 61 /* 62 * Reads the current bad blocks from the bad blocks inode. 63 */ 64 errcode_t ext2fs_read_bb_inode(ext2_filsys fs, ext2_badblocks_list *bb_list) 65 { 66 errcode_t retval; 67 struct read_bb_record rb; 68 struct ext2_inode inode; 69 blk_t numblocks; 70 71 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 72 73 if (!*bb_list) { 74 retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode); 75 if (retval) 76 return retval; 77 numblocks = inode.i_blocks; 78 if (!((fs->super->s_feature_ro_compat & 79 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) && 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
