diff options
Diffstat (limited to 'lib/e2p/ljs.c')
| -rw-r--r-- | lib/e2p/ljs.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/lib/e2p/ljs.c b/lib/e2p/ljs.c new file mode 100644 index 0000000..5972819 --- /dev/null +++ b/lib/e2p/ljs.c @@ -0,0 +1,134 @@ +/* + * 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)); +} |