lib/e2p/ljs.c

   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 }