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
e2p_swab32(__u32 val)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
journal_checksum_type_str(__u8 type)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
e2p_list_journal_super(FILE * f,char * journal_sb_buf,int exp_block_size,int flags)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 }
114