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/*
* ljs.c - List the contents of an journal superblock
*
* Copyright (C) 1995, 1996, 1997 Theodore Ts'o <tytso@mit.edu>
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Library
* General Public License, version 2.
* %End-Header%
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <string.h>
#include <grp.h>
#include <pwd.h>
#include <time.h>
#include "ext2fs/ext2_fs.h"
#include "ext2fs/ext2fs.h"
#include "e2p.h"
#include "ext2fs/kernel-jbd.h"
#ifdef WORDS_BIGENDIAN
#define e2p_be32(x) (x)
#else
static __u32 e2p_swab32(__u32 val)
{
return ((val>>24) | ((val>>8)&0xFF00) |
((val<<8)&0xFF0000) | (val<<24));
}
#define e2p_be32(x) e2p_swab32(x)
#endif
/*
* This function is copied from kernel-jbd.h's function
* jbd2_journal_get_num_fc_blks() to avoid inter-library dependencies.
*/
static inline int get_num_fc_blks(journal_superblock_t *jsb)
{
int num_fc_blocks = e2p_be32(jsb->s_num_fc_blks);
return num_fc_blocks ? num_fc_blocks : JBD2_DEFAULT_FAST_COMMIT_BLOCKS;
}
static const char *journal_checksum_type_str(__u8 type)
{
switch (type) {
case JBD2_CRC32C_CHKSUM:
return "crc32c";
default:
return "unknown";
}
}
void e2p_list_journal_super(FILE *f, char *journal_sb_buf,
int exp_block_size, int flags)
{
journal_superblock_t *jsb = (journal_superblock_t *) journal_sb_buf;
__u32 *mask_ptr, mask, m;
unsigned int size;
int j, printed = 0;
unsigned int i, nr_users;
int num_fc_blks = 0;
int journal_blks = 0;
if (flags & E2P_LIST_JOURNAL_FLAG_FC)
num_fc_blks = get_num_fc_blks((journal_superblock_t *)journal_sb_buf);
journal_blks = ntohl(jsb->s_maxlen) - num_fc_blks;
fprintf(f, "%s", "Journal features: ");
for (i=0, mask_ptr=&jsb->s_feature_compat; i <3; i++,mask_ptr++) {
mask = e2p_be32(*mask_ptr);
for (j=0,m=1; j < 32; j++, m<<=1) {
if (mask & m) {
fprintf(f, " %s", e2p_jrnl_feature2string(i, m));
printed++;
}
}
}
if (printed == 0)
fprintf(f, " (none)");
fputc('\n', f);
fputs("Total journal size: ", f);
size = (ntohl(jsb->s_blocksize) / 1024) * ntohl(jsb->s_maxlen);
if (size < 8192)
fprintf(f, "%uk\n", size);
else
fprintf(f, "%uM\n", size >> 10);
nr_users = (unsigned int) ntohl(jsb->s_nr_users);
if (exp_block_size != (int) ntohl(jsb->s_blocksize))
fprintf(f, "Journal block size: %u\n",
(unsigned int)ntohl(jsb->s_blocksize));
fprintf(f, "Total journal blocks: %u\n",
(unsigned int)(journal_blks + num_fc_blks));
fprintf(f, "Max transaction length: %u\n",
(unsigned int)journal_blks);
fprintf(f, "Fast commit length: %u\n",
(unsigned int)num_fc_blks);
if (ntohl(jsb->s_first) != 1)
fprintf(f, "Journal first block: %u\n",
(unsigned int)ntohl(jsb->s_first));
fprintf(f, "Journal sequence: 0x%08x\n"
"Journal start: %u\n",
(unsigned int)ntohl(jsb->s_sequence),
(unsigned int)ntohl(jsb->s_start));
if (nr_users != 1)
fprintf(f, "Journal number of users: %u\n", nr_users);
if (jsb->s_feature_compat & e2p_be32(JBD2_FEATURE_COMPAT_CHECKSUM))
fprintf(f, "%s", "Journal checksum type: crc32\n");
if ((jsb->s_feature_incompat &
e2p_be32(JBD2_FEATURE_INCOMPAT_CSUM_V3)) ||
(jsb->s_feature_incompat &
e2p_be32(JBD2_FEATURE_INCOMPAT_CSUM_V2)))
fprintf(f, "Journal checksum type: %s\n"
"Journal checksum: 0x%08x\n",
journal_checksum_type_str(jsb->s_checksum_type),
e2p_be32(jsb->s_checksum));
if ((nr_users > 1) ||
!e2p_is_null_uuid(&jsb->s_users[0])) {
for (i=0; i < nr_users && i < JBD2_USERS_MAX; i++) {
printf(i ? " %s\n"
: "Journal users: %s\n",
e2p_uuid2str(&jsb->s_users[i * UUID_SIZE]));
}
}
if (jsb->s_errno != 0)
fprintf(f, "Journal errno: %d\n",
(int) ntohl(jsb->s_errno));
}
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