1 /* 2 * ljs.c - List the contents of an journal superblock 3 * 4 * Copyright (C) 1995, 1996, 1997 Theodore Ts'o <tytso@mit.edu> 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 13 #include "config.h" 14 #include <stdio.h> 15 #include <stdlib.h> 16 #include <sys/types.h> 17 #include <string.h> 18 #include <grp.h> 19 #include <pwd.h> 20 #include <time.h> 21 22 #include "ext2fs/ext2_fs.h" 23 #include "ext2fs/ext2fs.h" 24 #include "e2p.h" 25 #include "ext2fs/kernel-jbd.h" 26 27 #ifdef WORDS_BIGENDIAN 28 #define e2p_be32(x) (x) 29 #else 30 static __u32 e2p_swab32(__u32 val) 31 { 32 return ((val>>24) | ((val>>8)&0xFF00) | 33 ((val<<8)&0xFF0000) | (val<<24)); 34 } 35 36 #define e2p_be32(x) e2p_swab32(x) 37 #endif 38 39 static const char *journal_checksum_type_str(__u8 type) 40 { 41 switch (type) { 42 case JBD2_CRC32C_CHKSUM: 43 return "crc32c"; 44 default: 45 return "unknown"; 46 } 47 } 48 49 void e2p_list_journal_super(FILE *f, char *journal_sb_buf, 50 int exp_block_size, int flags) 51 { 52 journal_superblock_t *jsb = (journal_superblock_t *) journal_sb_buf; 53 __u32 *mask_ptr, mask, m; 54 unsigned int size; 55 int j, printed = 0; 56 unsigned int i, nr_users; 57 58 fprintf(f, "%s", "Journal features: "); 59 for (i=0, mask_ptr=&jsb->s_feature_compat; i <3; i++,mask_ptr++) { 60 mask = e2p_be32(*mask_ptr); 61 for (j=0,m=1; j < 32; j++, m<<=1) { 62 if (mask & m) { 63 fprintf(f, " %s", e2p_jrnl_feature2string(i, m)); 64 printed++; 65 } 66 } 67 } 68 if (printed == 0) 69 fprintf(f, " (none)"); 70 fputc('\n', f); 71 fputs("Journal size: ", f); 72 size = (ntohl(jsb->s_blocksize) / 1024) * ntohl(jsb->s_maxlen); 73 if (size < 8192) 74 fprintf(f, "%uk\n", size); 75 else 76 fprintf(f, "%uM\n", size >> 10); 77 nr_users = (unsigned int) ntohl(jsb->s_nr_users); 78 if (exp_block_size != (int) ntohl(jsb->s_blocksize)) 79 fprintf(f, "Journal block size: %u\n", 80 (unsigned int)ntohl(jsb->s_blocksize)); 81 fprintf(f, "Journal length: %u\n", 82 (unsigned int)ntohl(jsb->s_maxlen)); 83 if (ntohl(jsb->s_first) != 1) 84 fprintf(f, "Journal first block: %u\n", 85 (unsigned int)ntohl(jsb->s_first)); 86 fprintf(f, "Journal sequence: 0x%08x\n" 87 "Journal start: %u\n", 88 (unsigned int)ntohl(jsb->s_sequence), 89 (unsigned int)ntohl(jsb->s_start)); 90 if (nr_users != 1) 91 fprintf(f, "Journal number of users: %u\n", nr_users); 92 if (jsb->s_feature_compat & e2p_be32(JFS_FEATURE_COMPAT_CHECKSUM)) 93 fprintf(f, "%s", "Journal checksum type: crc32\n"); 94 if ((jsb->s_feature_incompat & 95 e2p_be32(JFS_FEATURE_INCOMPAT_CSUM_V3)) || 96 (jsb->s_feature_incompat & 97 e2p_be32(JFS_FEATURE_INCOMPAT_CSUM_V2))) 98 fprintf(f, "Journal checksum type: %s\n" 99 "Journal checksum: 0x%08x\n", 100 journal_checksum_type_str(jsb->s_checksum_type), 101 e2p_be32(jsb->s_checksum)); 102 if ((nr_users > 1) || 103 !e2p_is_null_uuid(&jsb->s_users[0])) { 104 for (i=0; i < nr_users && i < JFS_USERS_MAX; i++) { 105 printf(i ? " %s\n" 106 : "Journal users: %s\n", 107 e2p_uuid2str(&jsb->s_users[i * UUID_SIZE])); 108 } 109 } 110 if (jsb->s_errno != 0) 111 fprintf(f, "Journal errno: %d\n", 112 (int) ntohl(jsb->s_errno)); 113 }