diff options
Diffstat (limited to 'debugfs/do_journal.c')
| -rw-r--r-- | debugfs/do_journal.c | 972 |
1 files changed, 972 insertions, 0 deletions
diff --git a/debugfs/do_journal.c b/debugfs/do_journal.c new file mode 100644 index 0000000..38439c6 --- /dev/null +++ b/debugfs/do_journal.c @@ -0,0 +1,972 @@ +/* + * do_journal.c --- Scribble onto the journal! + * + * Copyright (C) 2014 Oracle. This file may be redistributed + * under the terms of the GNU Public License. + */ + +#include "config.h" +#include <stdio.h> +#ifdef HAVE_GETOPT_H +#include <getopt.h> +#else +extern int optind; +extern char *optarg; +#endif +#include <ctype.h> +#include <unistd.h> +#ifdef HAVE_SYS_TIME_H +#include <sys/time.h> +#endif + +#include "debugfs.h" +#include "ext2fs/kernel-jbd.h" +#include "journal.h" + +#undef DEBUG + +#ifdef DEBUG +# define dbg_printf(f, a...) do {printf("JFS DEBUG: " f, ## a); \ + fflush(stdout); \ +} while (0) +#else +# define dbg_printf(f, a...) +#endif + +#define JOURNAL_CHECK_TRANS_MAGIC(x) \ + do { \ + if ((x)->magic != J_TRANS_MAGIC) \ + return EXT2_ET_INVALID_ARGUMENT; \ + } while (0) + +#define J_TRANS_MAGIC 0xD15EA5ED +#define J_TRANS_OPEN 1 +#define J_TRANS_COMMITTED 2 +struct journal_transaction_s { + unsigned int magic; + ext2_filsys fs; + journal_t *journal; + blk64_t block; + blk64_t start, end; + tid_t tid; + int flags; +}; + +typedef struct journal_transaction_s journal_transaction_t; + +static journal_t *current_journal = NULL; + +static void journal_dump_trans(journal_transaction_t *trans EXT2FS_ATTR((unused)), + const char *tag EXT2FS_ATTR((unused))) +{ + dbg_printf("TRANS %p(%s): tid=%u start=%llu block=%llu end=%llu " + "flags=0x%x\n", trans, tag, trans->tid, trans->start, + trans->block, trans->end, trans->flags); +} + +static errcode_t journal_commit_trans(journal_transaction_t *trans) +{ + struct buffer_head *bh, *cbh = NULL; + struct commit_header *commit; +#ifdef HAVE_SYS_TIME_H + struct timeval tv; +#endif + errcode_t err; + + JOURNAL_CHECK_TRANS_MAGIC(trans); + + if ((trans->flags & J_TRANS_COMMITTED) || + !(trans->flags & J_TRANS_OPEN)) + return EXT2_ET_INVALID_ARGUMENT; + + bh = getblk(trans->journal->j_dev, 0, trans->journal->j_blocksize); + if (bh == NULL) + return ENOMEM; + + /* write the descriptor block header */ + commit = (struct commit_header *)bh->b_data; + commit->h_magic = ext2fs_cpu_to_be32(JBD2_MAGIC_NUMBER); + commit->h_blocktype = ext2fs_cpu_to_be32(JBD2_COMMIT_BLOCK); + commit->h_sequence = ext2fs_cpu_to_be32(trans->tid); + if (jbd2_has_feature_checksum(trans->journal)) { + __u32 csum_v1 = ~0; + blk64_t cblk; + + cbh = getblk(trans->journal->j_dev, 0, + trans->journal->j_blocksize); + if (cbh == NULL) { + err = ENOMEM; + goto error; + } + + for (cblk = trans->start; cblk < trans->block; cblk++) { + err = jbd2_journal_bmap(trans->journal, cblk, + &cbh->b_blocknr); + if (err) + goto error; + mark_buffer_uptodate(cbh, 0); + ll_rw_block(REQ_OP_READ, 0, 1, &cbh); + err = cbh->b_err; + if (err) + goto error; + csum_v1 = ext2fs_crc32_be(csum_v1, + (unsigned char const *)cbh->b_data, + cbh->b_size); + } + + commit->h_chksum_type = JBD2_CRC32_CHKSUM; + commit->h_chksum_size = JBD2_CRC32_CHKSUM_SIZE; + commit->h_chksum[0] = ext2fs_cpu_to_be32(csum_v1); + } else { + commit->h_chksum_type = 0; + commit->h_chksum_size = 0; + commit->h_chksum[0] = 0; + } +#ifdef HAVE_SYS_TIME_H + gettimeofday(&tv, NULL); + commit->h_commit_sec = ext2fs_cpu_to_be32(tv.tv_sec); + commit->h_commit_nsec = ext2fs_cpu_to_be32(tv.tv_usec * 1000); +#else + commit->h_commit_sec = 0; + commit->h_commit_nsec = 0; +#endif + + /* Write block */ + jbd2_commit_block_csum_set(trans->journal, bh); + err = jbd2_journal_bmap(trans->journal, trans->block, &bh->b_blocknr); + if (err) + goto error; + + dbg_printf("Writing commit block at %llu:%llu\n", trans->block, + bh->b_blocknr); + mark_buffer_dirty(bh); + ll_rw_block(REQ_OP_WRITE, 0, 1, &bh); + err = bh->b_err; + if (err) + goto error; + trans->flags |= J_TRANS_COMMITTED; + trans->flags &= ~J_TRANS_OPEN; + trans->block++; + + ext2fs_set_feature_journal_needs_recovery(trans->fs->super); + ext2fs_mark_super_dirty(trans->fs); +error: + if (cbh) + brelse(cbh); + brelse(bh); + return err; +} + +static errcode_t journal_add_revoke_to_trans(journal_transaction_t *trans, + blk64_t *revoke_list, + size_t revoke_len) +{ + jbd2_journal_revoke_header_t *jrb; + void *buf; + size_t i, offset; + blk64_t curr_blk; + unsigned int sz; + unsigned csum_size = 0; + struct buffer_head *bh; + errcode_t err; + + JOURNAL_CHECK_TRANS_MAGIC(trans); + + if ((trans->flags & J_TRANS_COMMITTED) || + !(trans->flags & J_TRANS_OPEN)) + return EXT2_ET_INVALID_ARGUMENT; + + if (revoke_len == 0) + return 0; + + /* Do we need to leave space at the end for a checksum? */ + if (jbd2_journal_has_csum_v2or3(trans->journal)) + csum_size = sizeof(struct jbd2_journal_block_tail); + + curr_blk = trans->block; + + bh = getblk(trans->journal->j_dev, curr_blk, + trans->journal->j_blocksize); + if (bh == NULL) + return ENOMEM; + jrb = buf = bh->b_data; + jrb->r_header.h_magic = ext2fs_cpu_to_be32(JBD2_MAGIC_NUMBER); + jrb->r_header.h_blocktype = ext2fs_cpu_to_be32(JBD2_REVOKE_BLOCK); + jrb->r_header.h_sequence = ext2fs_cpu_to_be32(trans->tid); + offset = sizeof(*jrb); + + if (jbd2_has_feature_64bit(trans->journal)) + sz = 8; + else + sz = 4; + + for (i = 0; i < revoke_len; i++) { + /* Block full, write to journal */ + if (offset + sz > trans->journal->j_blocksize - csum_size) { + jrb->r_count = ext2fs_cpu_to_be32(offset); + jbd2_revoke_csum_set(trans->journal, bh); + + err = jbd2_journal_bmap(trans->journal, curr_blk, + &bh->b_blocknr); + if (err) + goto error; + dbg_printf("Writing revoke block at %llu:%llu\n", + curr_blk, bh->b_blocknr); + mark_buffer_dirty(bh); + ll_rw_block(REQ_OP_WRITE, 0, 1, &bh); + err = bh->b_err; + if (err) + goto error; + + offset = sizeof(*jrb); + curr_blk++; + } + + if (revoke_list[i] >= + ext2fs_blocks_count(trans->journal->j_fs_dev->k_fs->super)) { + err = EXT2_ET_BAD_BLOCK_NUM; + goto error; + } + + if (jbd2_has_feature_64bit(trans->journal)) + *((__u64 *)(&((char *)buf)[offset])) = + ext2fs_cpu_to_be64(revoke_list[i]); + else + *((__u32 *)(&((char *)buf)[offset])) = + ext2fs_cpu_to_be32(revoke_list[i]); + offset += sz; + } + + if (offset > 0) { + jrb->r_count = ext2fs_cpu_to_be32(offset); + jbd2_revoke_csum_set(trans->journal, bh); + + err = jbd2_journal_bmap(trans->journal, curr_blk, + &bh->b_blocknr); + if (err) + goto error; + dbg_printf("Writing revoke block at %llu:%llu\n", + curr_blk, bh->b_blocknr); + mark_buffer_dirty(bh); + ll_rw_block(REQ_OP_WRITE, 0, 1, &bh); + err = bh->b_err; + if (err) + goto error; + curr_blk++; + } + +error: + trans->block = curr_blk; + brelse(bh); + return err; +} + +static errcode_t journal_add_blocks_to_trans(journal_transaction_t *trans, + blk64_t *block_list, size_t block_len, + FILE *fp) +{ + blk64_t curr_blk, jdb_blk; + size_t i, j; + int csum_size = 0; + journal_header_t *jdb; + journal_block_tag_t *jdbt; + int tag_bytes; + void *buf = NULL, *jdb_buf = NULL; + struct buffer_head *bh = NULL, *data_bh; + errcode_t err; + + JOURNAL_CHECK_TRANS_MAGIC(trans); + + if ((trans->flags & J_TRANS_COMMITTED) || + !(trans->flags & J_TRANS_OPEN)) + return EXT2_ET_INVALID_ARGUMENT; + + if (block_len == 0) + return 0; + + /* Do we need to leave space at the end for a checksum? */ + if (jbd2_journal_has_csum_v2or3(trans->journal)) + csum_size = sizeof(struct jbd2_journal_block_tail); + + curr_blk = jdb_blk = trans->block; + + data_bh = getblk(trans->journal->j_dev, curr_blk, + trans->journal->j_blocksize); + if (data_bh == NULL) + return ENOMEM; + buf = data_bh->b_data; + + /* write the descriptor block header */ + bh = getblk(trans->journal->j_dev, curr_blk, + trans->journal->j_blocksize); + if (bh == NULL) { + err = ENOMEM; + goto error; + } + jdb = jdb_buf = bh->b_data; + jdb->h_magic = ext2fs_cpu_to_be32(JBD2_MAGIC_NUMBER); + jdb->h_blocktype = ext2fs_cpu_to_be32(JBD2_DESCRIPTOR_BLOCK); + jdb->h_sequence = ext2fs_cpu_to_be32(trans->tid); + jdbt = (journal_block_tag_t *)(jdb + 1); + + curr_blk++; + for (i = 0; i < block_len; i++) { + j = fread(data_bh->b_data, trans->journal->j_blocksize, 1, fp); + if (j != 1) { + err = errno; + goto error; + } + + tag_bytes = journal_tag_bytes(trans->journal); + + /* No space left in descriptor block, write it out */ + if ((char *)jdbt + tag_bytes > + (char *)jdb_buf + trans->journal->j_blocksize - csum_size) { + jbd2_descr_block_csum_set(trans->journal, bh); + err = jbd2_journal_bmap(trans->journal, jdb_blk, + &bh->b_blocknr); + if (err) + goto error; + dbg_printf("Writing descriptor block at %llu:%llu\n", + jdb_blk, bh->b_blocknr); + mark_buffer_dirty(bh); + ll_rw_block(REQ_OP_WRITE, 0, 1, &bh); + err = bh->b_err; + if (err) + goto error; + + jdbt = (journal_block_tag_t *)(jdb + 1); + jdb_blk = curr_blk; + curr_blk++; + } + + if (block_list[i] >= + ext2fs_blocks_count(trans->journal->j_fs_dev->k_fs->super)) { + err = EXT2_ET_BAD_BLOCK_NUM; + goto error; + } + + /* Fill out the block tag */ + jdbt->t_blocknr = ext2fs_cpu_to_be32(block_list[i] & 0xFFFFFFFF); + jdbt->t_flags = 0; + if (jdbt != (journal_block_tag_t *)(jdb + 1)) + jdbt->t_flags |= ext2fs_cpu_to_be16(JBD2_FLAG_SAME_UUID); + else { + memcpy(jdbt + tag_bytes, + trans->journal->j_superblock->s_uuid, + sizeof(trans->journal->j_superblock->s_uuid)); + tag_bytes += 16; + } + if (i == block_len - 1) + jdbt->t_flags |= ext2fs_cpu_to_be16(JBD2_FLAG_LAST_TAG); + if (*((__u32 *)buf) == ext2fs_cpu_to_be32(JBD2_MAGIC_NUMBER)) { + *((__u32 *)buf) = 0; + jdbt->t_flags |= ext2fs_cpu_to_be16(JBD2_FLAG_ESCAPE); + } + if (jbd2_has_feature_64bit(trans->journal)) + jdbt->t_blocknr_high = ext2fs_cpu_to_be32(block_list[i] >> 32); + jbd2_block_tag_csum_set(trans->journal, jdbt, data_bh, + trans->tid); + + /* Write the data block */ + err = jbd2_journal_bmap(trans->journal, curr_blk, + &data_bh->b_blocknr); + if (err) + goto error; + dbg_printf("Writing data block %llu at %llu:%llu tag %d\n", + block_list[i], curr_blk, data_bh->b_blocknr, + tag_bytes); + mark_buffer_dirty(data_bh); + ll_rw_block(REQ_OP_WRITE, 0, 1, &data_bh); + err = data_bh->b_err; + if (err) + goto error; + + curr_blk++; + jdbt = (journal_block_tag_t *)(((char *)jdbt) + tag_bytes); + } + + /* Write out the last descriptor block */ + if (jdbt != (journal_block_tag_t *)(jdb + 1)) { + jbd2_descr_block_csum_set(trans->journal, bh); + err = jbd2_journal_bmap(trans->journal, jdb_blk, + &bh->b_blocknr); + if (err) + goto error; + dbg_printf("Writing descriptor block at %llu:%llu\n", + jdb_blk, bh->b_blocknr); + mark_buffer_dirty(bh); + ll_rw_block(REQ_OP_WRITE, 0, 1, &bh); + err = bh->b_err; + if (err) + goto error; + } + +error: + trans->block = curr_blk; + if (bh) + brelse(bh); + brelse(data_bh); + return err; +} + +static blk64_t journal_guess_blocks(journal_t *journal, blk64_t data_blocks, + blk64_t revoke_blocks) +{ + blk64_t ret = 1; + unsigned int bs, sz; + + /* Estimate # of revoke blocks */ + bs = journal->j_blocksize; + if (jbd2_journal_has_csum_v2or3(journal)) + bs -= sizeof(struct jbd2_journal_block_tail); + sz = jbd2_has_feature_64bit(journal) ? sizeof(__u64) : sizeof(__u32); + ret += revoke_blocks * sz / bs; + + /* Estimate # of data blocks */ + bs = journal->j_blocksize - 16; + if (jbd2_journal_has_csum_v2or3(journal)) + bs -= sizeof(struct jbd2_journal_block_tail); + sz = journal_tag_bytes(journal); + ret += data_blocks * sz / bs; + + ret += data_blocks; + + return ret; +} + +static errcode_t journal_open_trans(journal_t *journal, + journal_transaction_t *trans, + blk64_t blocks) +{ + trans->fs = journal->j_fs_dev->k_fs; + trans->journal = journal; + trans->flags = J_TRANS_OPEN; + + if (journal->j_tail == 0) { + /* Clean journal, start at the tail */ + trans->tid = journal->j_tail_sequence; + trans->start = journal->j_first; + } else { + /* Put new transaction at the head of the list */ + trans->tid = journal->j_transaction_sequence; + trans->start = journal->j_head; + } + + trans->block = trans->start; + if (trans->start + blocks > journal->j_last) + return ENOSPC; + trans->end = trans->block + blocks; + journal_dump_trans(trans, "new transaction"); + + trans->magic = J_TRANS_MAGIC; + return 0; +} + +static errcode_t journal_close_trans(journal_transaction_t *trans) +{ + journal_t *journal; + + JOURNAL_CHECK_TRANS_MAGIC(trans); + + if (!(trans->flags & J_TRANS_COMMITTED)) + return 0; + + journal = trans->journal; + if (journal->j_tail == 0) { + /* Update the tail */ + journal->j_tail_sequence = trans->tid; + journal->j_tail = trans->start; + journal->j_superblock->s_start = ext2fs_cpu_to_be32(trans->start); + } + + /* Update the head */ + journal->j_head = trans->end + 1; + journal->j_transaction_sequence = trans->tid + 1; + + trans->magic = 0; + + /* Mark ourselves as needing recovery */ + if (!ext2fs_has_feature_journal_needs_recovery(trans->fs->super)) { + ext2fs_set_feature_journal_needs_recovery(trans->fs->super); + ext2fs_mark_super_dirty(trans->fs); + } + + return 0; +} + +#define JOURNAL_WRITE_NO_COMMIT 1 +static errcode_t journal_write(journal_t *journal, + int flags, blk64_t *block_list, + size_t block_len, blk64_t *revoke_list, + size_t revoke_len, FILE *fp) +{ + blk64_t blocks; + journal_transaction_t trans; + errcode_t err; + + if (revoke_len > 0) { + jbd2_set_feature_revoke(journal); + mark_buffer_dirty(journal->j_sb_buffer); + } + + blocks = journal_guess_blocks(journal, block_len, revoke_len); + err = journal_open_trans(journal, &trans, blocks); + if (err) + goto error; + + err = journal_add_blocks_to_trans(&trans, block_list, block_len, fp); + if (err) + goto error; + + err = journal_add_revoke_to_trans(&trans, revoke_list, revoke_len); + if (err) + goto error; + + if (!(flags & JOURNAL_WRITE_NO_COMMIT)) { + err = journal_commit_trans(&trans); + if (err) + goto error; + } + + err = journal_close_trans(&trans); +error: + return err; +} + +void do_journal_write(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)), + void *infop EXT2FS_ATTR((unused))) +{ + blk64_t *blist = NULL, *rlist = NULL; + size_t bn = 0, rn = 0; + FILE *fp = NULL; + int opt; + int flags = 0; + errcode_t err; + + if (current_journal == NULL) { + printf("Journal not open.\n"); + return; + } + + reset_getopt(); + while ((opt = getopt(argc, argv, "b:r:c")) != -1) { + switch (opt) { + case 'b': + err = read_list(optarg, &blist, &bn); + if (err) { + com_err(argv[0], err, + "while reading block list"); + goto out; + } + break; + case 'r': + err = read_list(optarg, &rlist, &rn); + if (err) { + com_err(argv[0], err, + "while reading revoke list"); + goto out; + } + break; + case 'c': + flags |= JOURNAL_WRITE_NO_COMMIT; + break; + default: + printf("%s [-b blocks] [-r revoke] [-c] file\n", + argv[0]); + printf("-b: Write these blocks into transaction.\n"); + printf("-c: Do not commit transaction.\n"); + printf("-r: Revoke these blocks from transaction.\n"); + + goto out; + } + } + + if (bn > 0 && optind != argc - 1) { + printf("Need a file to read blocks from.\n"); + return; + } + + if (bn > 0) { + fp = fopen(argv[optind], "r"); + if (fp == NULL) { + com_err(argv[0], errno, + "while opening journal data file"); + goto out; + } + } + + err = journal_write(current_journal, flags, blist, bn, + rlist, rn, fp); + if (err) + com_err("journal_write", err, "while writing journal"); + + if (fp) + fclose(fp); +out: + if (blist) + free(blist); + if (rlist) + free(rlist); +} + +/* Make sure we wrap around the log correctly! */ +#define wrap(journal, var) \ +do { \ + if (var >= (journal)->j_last) \ + var -= ((journal)->j_last - (journal)->j_first); \ +} while (0) + +/* + * Count the number of in-use tags in a journal descriptor block. + */ + +static int count_tags(journal_t *journal, char *buf) +{ + char *tagp; + journal_block_tag_t *tag; + int nr = 0, size = journal->j_blocksize; + int tag_bytes = journal_tag_bytes(journal); + + if (jbd2_journal_has_csum_v2or3(journal)) + size -= sizeof(struct jbd2_journal_block_tail); + + tagp = buf + sizeof(journal_header_t); + + while ((tagp - buf + tag_bytes) <= size) { + tag = (journal_block_tag_t *) tagp; + + nr++; + tagp += tag_bytes; + if (!(tag->t_flags & ext2fs_cpu_to_be16(JBD2_FLAG_SAME_UUID))) + tagp += 16; + + if (tag->t_flags & ext2fs_cpu_to_be16(JBD2_FLAG_LAST_TAG)) + break; + } + + return nr; +} + +static errcode_t journal_find_head(journal_t *journal) +{ + unsigned int next_commit_ID; + blk64_t next_log_block, head_block; + int err; + journal_superblock_t *sb; + journal_header_t *tmp; + struct buffer_head *bh; + unsigned int sequence; + int blocktype; + + /* + * First thing is to establish what we expect to find in the log + * (in terms of transaction IDs), and where (in terms of log + * block offsets): query the superblock. + */ + + sb = journal->j_superblock; + next_commit_ID = ext2fs_be32_to_cpu(sb->s_sequence); + next_log_block = ext2fs_be32_to_cpu(sb->s_start); + head_block = next_log_block; + + if (next_log_block == 0) + return 0; + + bh = getblk(journal->j_dev, 0, journal->j_blocksize); + if (bh == NULL) + return ENOMEM; + + /* + * Now we walk through the log, transaction by transaction, + * making sure that each transaction has a commit block in the + * expected place. Each complete transaction gets replayed back + * into the main filesystem. + */ + while (1) { + dbg_printf("Scanning for sequence ID %u at %lu/%lu\n", + next_commit_ID, (unsigned long)next_log_block, + journal->j_last); + + /* Skip over each chunk of the transaction looking + * either the next descriptor block or the final commit + * record. */ + err = jbd2_journal_bmap(journal, next_log_block, + &bh->b_blocknr); + if (err) + goto err; + mark_buffer_uptodate(bh, 0); + ll_rw_block(REQ_OP_READ, 0, 1, &bh); + err = bh->b_err; + if (err) + goto err; + + next_log_block++; + wrap(journal, next_log_block); + + /* What kind of buffer is it? + * + * If it is a descriptor block, check that it has the + * expected sequence number. Otherwise, we're all done + * here. */ + + tmp = (journal_header_t *)bh->b_data; + + if (tmp->h_magic != ext2fs_cpu_to_be32(JBD2_MAGIC_NUMBER)) { + dbg_printf("JBD2: wrong magic 0x%x\n", tmp->h_magic); + goto err; + } + + blocktype = ext2fs_be32_to_cpu(tmp->h_blocktype); + sequence = ext2fs_be32_to_cpu(tmp->h_sequence); + dbg_printf("Found magic %d, sequence %d\n", + blocktype, sequence); + + if (sequence != next_commit_ID) { + dbg_printf("JBD2: Wrong sequence %d (wanted %d)\n", + sequence, next_commit_ID); + goto err; + } + + /* OK, we have a valid descriptor block which matches + * all of the sequence number checks. What are we going + * to do with it? That depends on the pass... */ + + switch (blocktype) { + case JBD2_DESCRIPTOR_BLOCK: + next_log_block += count_tags(journal, bh->b_data); + wrap(journal, next_log_block); + continue; + + case JBD2_COMMIT_BLOCK: + head_block = next_log_block; + next_commit_ID++; + continue; + + case JBD2_REVOKE_BLOCK: + continue; + + default: + dbg_printf("Unrecognised magic %d, end of scan.\n", + blocktype); + err = -EINVAL; + goto err; + } + } + +err: + if (err == 0) { + dbg_printf("head seq=%d blk=%llu\n", next_commit_ID, + head_block); + journal->j_transaction_sequence = next_commit_ID; + journal->j_head = head_block; + } + brelse(bh); + return err; +} + +static void update_journal_csum(journal_t *journal, int ver) +{ + journal_superblock_t *jsb; + + if (journal->j_format_version < 2) + return; + + if (journal->j_tail != 0 || + ext2fs_has_feature_journal_needs_recovery( + journal->j_fs_dev->k_fs->super)) { + printf("Journal needs recovery, will not add csums.\n"); + return; + } + + /* metadata_csum implies journal csum v3 */ + jsb = journal->j_superblock; + if (ext2fs_has_feature_metadata_csum(journal->j_fs_dev->k_fs->super)) { + printf("Setting csum v%d\n", ver); + switch (ver) { + case 2: + jbd2_clear_feature_csum3(journal); + jbd2_set_feature_csum2(journal); + jbd2_clear_feature_checksum(journal); + break; + case 3: + jbd2_set_feature_csum3(journal); + jbd2_clear_feature_csum2(journal); + jbd2_clear_feature_checksum(journal); + break; + default: + printf("Unknown checksum v%d\n", ver); + break; + } + journal->j_superblock->s_checksum_type = JBD2_CRC32C_CHKSUM; + journal->j_csum_seed = jbd2_chksum(journal, ~0, jsb->s_uuid, + sizeof(jsb->s_uuid)); + } else { + jbd2_clear_feature_csum3(journal); + jbd2_clear_feature_csum2(journal); + jbd2_set_feature_checksum(journal); + } +} + +static void update_uuid(journal_t *journal) +{ + size_t z; + ext2_filsys fs; + + if (journal->j_format_version < 2) + return; + + for (z = 0; z < sizeof(journal->j_superblock->s_uuid); z++) + if (journal->j_superblock->s_uuid[z]) + break; + if (z == 0) + return; + + fs = journal->j_fs_dev->k_fs; + if (!ext2fs_has_feature_64bit(fs->super)) + return; + + if (jbd2_has_feature_64bit(journal) && + ext2fs_has_feature_64bit(fs->super)) + return; + + if (journal->j_tail != 0 || + ext2fs_has_feature_journal_needs_recovery(fs->super)) { + printf("Journal needs recovery, will not set 64bit.\n"); + return; + } + + memcpy(journal->j_superblock->s_uuid, fs->super->s_uuid, + sizeof(fs->super->s_uuid)); +} + +static void update_64bit_flag(journal_t *journal) +{ + if (journal->j_format_version < 2) + return; + + if (!ext2fs_has_feature_64bit(journal->j_fs_dev->k_fs->super)) + return; + + if (jbd2_has_feature_64bit(journal) && + ext2fs_has_feature_64bit(journal->j_fs_dev->k_fs->super)) + return; + + if (journal->j_tail != 0 || + ext2fs_has_feature_journal_needs_recovery( + journal->j_fs_dev->k_fs->super)) { + printf("Journal needs recovery, will not set 64bit.\n"); + return; + } + + jbd2_set_feature_64bit(journal); +} + +void do_journal_open(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)), + void *infop EXT2FS_ATTR((unused))) +{ + int opt, enable_csum = 0, csum_ver = 3; + journal_t *journal; + errcode_t err; + + if (check_fs_open(argv[0])) + return; + if (check_fs_read_write(argv[0])) + return; + if (check_fs_bitmaps(argv[0])) + return; + if (current_journal) { + printf("Journal is already open.\n"); + return; + } + if (!ext2fs_has_feature_journal(current_fs->super)) { + printf("Journalling is not enabled on this filesystem.\n"); + return; + } + + reset_getopt(); + while ((opt = getopt(argc, argv, "cv:f:")) != -1) { + switch (opt) { + case 'c': + enable_csum = 1; + break; + case 'f': + if (current_fs->journal_name) + free(current_fs->journal_name); + current_fs->journal_name = strdup(optarg); + break; + case 'v': + csum_ver = atoi(optarg); + if (csum_ver != 2 && csum_ver != 3) { + printf("Unknown journal csum v%d\n", csum_ver); + csum_ver = 3; + } + break; + default: + printf("%s: [-c] [-v ver] [-f ext_jnl]\n", argv[0]); + printf("-c: Enable journal checksumming.\n"); + printf("-v: Use this version checksum format.\n"); + printf("-f: Load this external journal.\n"); + } + } + + err = ext2fs_open_journal(current_fs, ¤t_journal); + if (err) { + com_err(argv[0], err, "while opening journal"); + return; + } + journal = current_journal; + + dbg_printf("JOURNAL: seq=%u tailseq=%u start=%lu first=%lu " + "maxlen=%lu\n", journal->j_tail_sequence, + journal->j_transaction_sequence, journal->j_tail, + journal->j_first, journal->j_last); + + update_uuid(journal); + update_64bit_flag(journal); + if (enable_csum) + update_journal_csum(journal, csum_ver); + + err = journal_find_head(journal); + if (err) + com_err(argv[0], err, "while examining journal"); +} + +void do_journal_close(int argc EXT2FS_ATTR((unused)), + char *argv[] EXT2FS_ATTR((unused)), + int sci_idx EXT2FS_ATTR((unused)), + void *infop EXT2FS_ATTR((unused))) +{ + if (current_journal == NULL) { + printf("Journal not open.\n"); + return; + } + + ext2fs_close_journal(current_fs, ¤t_journal); +} + +void do_journal_run(int argc EXT2FS_ATTR((unused)), char *argv[], + int sci_idx EXT2FS_ATTR((unused)), + void *infop EXT2FS_ATTR((unused))) +{ + errcode_t err; + + if (check_fs_open(argv[0])) + return; + if (check_fs_read_write(argv[0])) + return; + if (check_fs_bitmaps(argv[0])) + return; + if (current_journal) { + printf("Please close the journal before recovering it.\n"); + return; + } + + err = ext2fs_run_ext3_journal(¤t_fs); + if (err) + com_err("journal_run", err, "while recovering journal"); + else { + ext2fs_clear_feature_journal_needs_recovery(current_fs->super); + ext2fs_mark_super_dirty(current_fs); + } +} |