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![Christoph Hellwig](/assets/img/avatar_default.png)
There is no point in allocating memory for a synchronous flush. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Acked-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
933 lines
24 KiB
C
933 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* linux/fs/jbd2/recovery.c
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*
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* Written by Stephen C. Tweedie <sct@redhat.com>, 1999
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*
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* Copyright 1999-2000 Red Hat Software --- All Rights Reserved
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*
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* Journal recovery routines for the generic filesystem journaling code;
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* part of the ext2fs journaling system.
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*/
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#ifndef __KERNEL__
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#include "jfs_user.h"
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#else
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#include <linux/time.h>
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#include <linux/fs.h>
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#include <linux/jbd2.h>
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#include <linux/errno.h>
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#include <linux/crc32.h>
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#include <linux/blkdev.h>
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#endif
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/*
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* Maintain information about the progress of the recovery job, so that
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* the different passes can carry information between them.
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*/
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struct recovery_info
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{
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tid_t start_transaction;
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tid_t end_transaction;
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int nr_replays;
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int nr_revokes;
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int nr_revoke_hits;
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};
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static int do_one_pass(journal_t *journal,
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struct recovery_info *info, enum passtype pass);
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static int scan_revoke_records(journal_t *, struct buffer_head *,
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tid_t, struct recovery_info *);
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#ifdef __KERNEL__
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/* Release readahead buffers after use */
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static void journal_brelse_array(struct buffer_head *b[], int n)
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{
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while (--n >= 0)
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brelse (b[n]);
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}
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/*
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* When reading from the journal, we are going through the block device
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* layer directly and so there is no readahead being done for us. We
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* need to implement any readahead ourselves if we want it to happen at
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* all. Recovery is basically one long sequential read, so make sure we
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* do the IO in reasonably large chunks.
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*
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* This is not so critical that we need to be enormously clever about
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* the readahead size, though. 128K is a purely arbitrary, good-enough
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* fixed value.
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*/
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#define MAXBUF 8
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static int do_readahead(journal_t *journal, unsigned int start)
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{
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int err;
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unsigned int max, nbufs, next;
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unsigned long long blocknr;
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struct buffer_head *bh;
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struct buffer_head * bufs[MAXBUF];
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/* Do up to 128K of readahead */
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max = start + (128 * 1024 / journal->j_blocksize);
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if (max > journal->j_total_len)
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max = journal->j_total_len;
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/* Do the readahead itself. We'll submit MAXBUF buffer_heads at
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* a time to the block device IO layer. */
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nbufs = 0;
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for (next = start; next < max; next++) {
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err = jbd2_journal_bmap(journal, next, &blocknr);
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if (err) {
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printk(KERN_ERR "JBD2: bad block at offset %u\n",
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next);
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goto failed;
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}
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bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
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if (!bh) {
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err = -ENOMEM;
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goto failed;
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}
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if (!buffer_uptodate(bh) && !buffer_locked(bh)) {
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bufs[nbufs++] = bh;
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if (nbufs == MAXBUF) {
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ll_rw_block(REQ_OP_READ, 0, nbufs, bufs);
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journal_brelse_array(bufs, nbufs);
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nbufs = 0;
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}
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} else
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brelse(bh);
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}
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if (nbufs)
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ll_rw_block(REQ_OP_READ, 0, nbufs, bufs);
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err = 0;
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failed:
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if (nbufs)
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journal_brelse_array(bufs, nbufs);
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return err;
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}
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#endif /* __KERNEL__ */
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/*
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* Read a block from the journal
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*/
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static int jread(struct buffer_head **bhp, journal_t *journal,
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unsigned int offset)
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{
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int err;
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unsigned long long blocknr;
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struct buffer_head *bh;
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*bhp = NULL;
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if (offset >= journal->j_total_len) {
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printk(KERN_ERR "JBD2: corrupted journal superblock\n");
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return -EFSCORRUPTED;
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}
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err = jbd2_journal_bmap(journal, offset, &blocknr);
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if (err) {
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printk(KERN_ERR "JBD2: bad block at offset %u\n",
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offset);
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return err;
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}
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bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
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if (!bh)
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return -ENOMEM;
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if (!buffer_uptodate(bh)) {
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/* If this is a brand new buffer, start readahead.
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Otherwise, we assume we are already reading it. */
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if (!buffer_req(bh))
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do_readahead(journal, offset);
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wait_on_buffer(bh);
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}
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if (!buffer_uptodate(bh)) {
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printk(KERN_ERR "JBD2: Failed to read block at offset %u\n",
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offset);
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brelse(bh);
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return -EIO;
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}
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*bhp = bh;
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return 0;
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}
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static int jbd2_descriptor_block_csum_verify(journal_t *j, void *buf)
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{
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struct jbd2_journal_block_tail *tail;
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__be32 provided;
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__u32 calculated;
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if (!jbd2_journal_has_csum_v2or3(j))
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return 1;
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tail = (struct jbd2_journal_block_tail *)(buf + j->j_blocksize -
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sizeof(struct jbd2_journal_block_tail));
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provided = tail->t_checksum;
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tail->t_checksum = 0;
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calculated = jbd2_chksum(j, j->j_csum_seed, buf, j->j_blocksize);
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tail->t_checksum = provided;
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return provided == cpu_to_be32(calculated);
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}
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/*
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* Count the number of in-use tags in a journal descriptor block.
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*/
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static int count_tags(journal_t *journal, struct buffer_head *bh)
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{
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char * tagp;
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journal_block_tag_t * tag;
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int nr = 0, size = journal->j_blocksize;
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int tag_bytes = journal_tag_bytes(journal);
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if (jbd2_journal_has_csum_v2or3(journal))
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size -= sizeof(struct jbd2_journal_block_tail);
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tagp = &bh->b_data[sizeof(journal_header_t)];
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while ((tagp - bh->b_data + tag_bytes) <= size) {
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tag = (journal_block_tag_t *) tagp;
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nr++;
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tagp += tag_bytes;
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if (!(tag->t_flags & cpu_to_be16(JBD2_FLAG_SAME_UUID)))
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tagp += 16;
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if (tag->t_flags & cpu_to_be16(JBD2_FLAG_LAST_TAG))
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break;
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}
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return nr;
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}
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/* Make sure we wrap around the log correctly! */
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#define wrap(journal, var) \
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do { \
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unsigned long _wrap_last = \
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jbd2_has_feature_fast_commit(journal) ? \
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(journal)->j_fc_last : (journal)->j_last; \
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\
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if (var >= _wrap_last) \
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var -= (_wrap_last - (journal)->j_first); \
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} while (0)
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static int fc_do_one_pass(journal_t *journal,
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struct recovery_info *info, enum passtype pass)
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{
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unsigned int expected_commit_id = info->end_transaction;
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unsigned long next_fc_block;
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struct buffer_head *bh;
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int err = 0;
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next_fc_block = journal->j_fc_first;
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if (!journal->j_fc_replay_callback)
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return 0;
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while (next_fc_block <= journal->j_fc_last) {
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jbd_debug(3, "Fast commit replay: next block %ld",
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next_fc_block);
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err = jread(&bh, journal, next_fc_block);
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if (err) {
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jbd_debug(3, "Fast commit replay: read error");
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break;
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}
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jbd_debug(3, "Processing fast commit blk with seq %d");
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err = journal->j_fc_replay_callback(journal, bh, pass,
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next_fc_block - journal->j_fc_first,
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expected_commit_id);
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next_fc_block++;
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if (err < 0 || err == JBD2_FC_REPLAY_STOP)
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break;
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err = 0;
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}
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if (err)
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jbd_debug(3, "Fast commit replay failed, err = %d\n", err);
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return err;
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}
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/**
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* jbd2_journal_recover - recovers a on-disk journal
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* @journal: the journal to recover
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*
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* The primary function for recovering the log contents when mounting a
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* journaled device.
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*
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* Recovery is done in three passes. In the first pass, we look for the
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* end of the log. In the second, we assemble the list of revoke
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* blocks. In the third and final pass, we replay any un-revoked blocks
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* in the log.
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*/
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int jbd2_journal_recover(journal_t *journal)
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{
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int err, err2;
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journal_superblock_t * sb;
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struct recovery_info info;
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memset(&info, 0, sizeof(info));
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sb = journal->j_superblock;
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/*
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* The journal superblock's s_start field (the current log head)
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* is always zero if, and only if, the journal was cleanly
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* unmounted.
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*/
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if (!sb->s_start) {
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jbd_debug(1, "No recovery required, last transaction %d\n",
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be32_to_cpu(sb->s_sequence));
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journal->j_transaction_sequence = be32_to_cpu(sb->s_sequence) + 1;
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return 0;
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}
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err = do_one_pass(journal, &info, PASS_SCAN);
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if (!err)
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err = do_one_pass(journal, &info, PASS_REVOKE);
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if (!err)
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err = do_one_pass(journal, &info, PASS_REPLAY);
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jbd_debug(1, "JBD2: recovery, exit status %d, "
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"recovered transactions %u to %u\n",
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err, info.start_transaction, info.end_transaction);
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jbd_debug(1, "JBD2: Replayed %d and revoked %d/%d blocks\n",
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info.nr_replays, info.nr_revoke_hits, info.nr_revokes);
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/* Restart the log at the next transaction ID, thus invalidating
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* any existing commit records in the log. */
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journal->j_transaction_sequence = ++info.end_transaction;
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jbd2_journal_clear_revoke(journal);
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err2 = sync_blockdev(journal->j_fs_dev);
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if (!err)
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err = err2;
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/* Make sure all replayed data is on permanent storage */
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if (journal->j_flags & JBD2_BARRIER) {
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err2 = blkdev_issue_flush(journal->j_fs_dev);
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if (!err)
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err = err2;
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}
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return err;
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}
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/**
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* jbd2_journal_skip_recovery - Start journal and wipe exiting records
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* @journal: journal to startup
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*
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* Locate any valid recovery information from the journal and set up the
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* journal structures in memory to ignore it (presumably because the
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* caller has evidence that it is out of date).
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* This function doesn't appear to be exported..
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*
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* We perform one pass over the journal to allow us to tell the user how
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* much recovery information is being erased, and to let us initialise
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* the journal transaction sequence numbers to the next unused ID.
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*/
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int jbd2_journal_skip_recovery(journal_t *journal)
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{
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int err;
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struct recovery_info info;
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memset (&info, 0, sizeof(info));
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err = do_one_pass(journal, &info, PASS_SCAN);
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if (err) {
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printk(KERN_ERR "JBD2: error %d scanning journal\n", err);
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++journal->j_transaction_sequence;
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} else {
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#ifdef CONFIG_JBD2_DEBUG
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int dropped = info.end_transaction -
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be32_to_cpu(journal->j_superblock->s_sequence);
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jbd_debug(1,
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"JBD2: ignoring %d transaction%s from the journal.\n",
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dropped, (dropped == 1) ? "" : "s");
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#endif
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journal->j_transaction_sequence = ++info.end_transaction;
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}
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journal->j_tail = 0;
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return err;
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}
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static inline unsigned long long read_tag_block(journal_t *journal,
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journal_block_tag_t *tag)
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{
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unsigned long long block = be32_to_cpu(tag->t_blocknr);
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if (jbd2_has_feature_64bit(journal))
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block |= (u64)be32_to_cpu(tag->t_blocknr_high) << 32;
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return block;
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}
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/*
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* calc_chksums calculates the checksums for the blocks described in the
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* descriptor block.
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*/
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static int calc_chksums(journal_t *journal, struct buffer_head *bh,
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unsigned long *next_log_block, __u32 *crc32_sum)
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{
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int i, num_blks, err;
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unsigned long io_block;
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struct buffer_head *obh;
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num_blks = count_tags(journal, bh);
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/* Calculate checksum of the descriptor block. */
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*crc32_sum = crc32_be(*crc32_sum, (void *)bh->b_data, bh->b_size);
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for (i = 0; i < num_blks; i++) {
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io_block = (*next_log_block)++;
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wrap(journal, *next_log_block);
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err = jread(&obh, journal, io_block);
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if (err) {
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printk(KERN_ERR "JBD2: IO error %d recovering block "
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"%lu in log\n", err, io_block);
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return 1;
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} else {
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*crc32_sum = crc32_be(*crc32_sum, (void *)obh->b_data,
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obh->b_size);
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}
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put_bh(obh);
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}
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return 0;
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}
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static int jbd2_commit_block_csum_verify(journal_t *j, void *buf)
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{
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struct commit_header *h;
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__be32 provided;
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__u32 calculated;
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if (!jbd2_journal_has_csum_v2or3(j))
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return 1;
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h = buf;
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provided = h->h_chksum[0];
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h->h_chksum[0] = 0;
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calculated = jbd2_chksum(j, j->j_csum_seed, buf, j->j_blocksize);
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h->h_chksum[0] = provided;
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return provided == cpu_to_be32(calculated);
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}
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static int jbd2_block_tag_csum_verify(journal_t *j, journal_block_tag_t *tag,
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void *buf, __u32 sequence)
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{
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journal_block_tag3_t *tag3 = (journal_block_tag3_t *)tag;
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__u32 csum32;
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__be32 seq;
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if (!jbd2_journal_has_csum_v2or3(j))
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return 1;
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seq = cpu_to_be32(sequence);
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csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&seq, sizeof(seq));
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csum32 = jbd2_chksum(j, csum32, buf, j->j_blocksize);
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|
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if (jbd2_has_feature_csum3(j))
|
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return tag3->t_checksum == cpu_to_be32(csum32);
|
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else
|
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return tag->t_checksum == cpu_to_be16(csum32);
|
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}
|
|
|
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static int do_one_pass(journal_t *journal,
|
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struct recovery_info *info, enum passtype pass)
|
|
{
|
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unsigned int first_commit_ID, next_commit_ID;
|
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unsigned long next_log_block;
|
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int err, success = 0;
|
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journal_superblock_t * sb;
|
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journal_header_t * tmp;
|
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struct buffer_head * bh;
|
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unsigned int sequence;
|
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int blocktype;
|
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int tag_bytes = journal_tag_bytes(journal);
|
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__u32 crc32_sum = ~0; /* Transactional Checksums */
|
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int descr_csum_size = 0;
|
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int block_error = 0;
|
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bool need_check_commit_time = false;
|
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__u64 last_trans_commit_time = 0, commit_time;
|
|
|
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/*
|
|
* 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.
|
|
*/
|
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|
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sb = journal->j_superblock;
|
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next_commit_ID = be32_to_cpu(sb->s_sequence);
|
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next_log_block = be32_to_cpu(sb->s_start);
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|
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first_commit_ID = next_commit_ID;
|
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if (pass == PASS_SCAN)
|
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info->start_transaction = first_commit_ID;
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|
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jbd_debug(1, "Starting recovery pass %d\n", pass);
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|
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/*
|
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* 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) {
|
|
int flags;
|
|
char * tagp;
|
|
journal_block_tag_t * tag;
|
|
struct buffer_head * obh;
|
|
struct buffer_head * nbh;
|
|
|
|
cond_resched();
|
|
|
|
/* If we already know where to stop the log traversal,
|
|
* check right now that we haven't gone past the end of
|
|
* the log. */
|
|
|
|
if (pass != PASS_SCAN)
|
|
if (tid_geq(next_commit_ID, info->end_transaction))
|
|
break;
|
|
|
|
jbd_debug(2, "Scanning for sequence ID %u at %lu/%lu\n",
|
|
next_commit_ID, next_log_block,
|
|
jbd2_has_feature_fast_commit(journal) ?
|
|
journal->j_fc_last : journal->j_last);
|
|
|
|
/* Skip over each chunk of the transaction looking
|
|
* either the next descriptor block or the final commit
|
|
* record. */
|
|
|
|
jbd_debug(3, "JBD2: checking block %ld\n", next_log_block);
|
|
err = jread(&bh, journal, next_log_block);
|
|
if (err)
|
|
goto failed;
|
|
|
|
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 != cpu_to_be32(JBD2_MAGIC_NUMBER)) {
|
|
brelse(bh);
|
|
break;
|
|
}
|
|
|
|
blocktype = be32_to_cpu(tmp->h_blocktype);
|
|
sequence = be32_to_cpu(tmp->h_sequence);
|
|
jbd_debug(3, "Found magic %d, sequence %d\n",
|
|
blocktype, sequence);
|
|
|
|
if (sequence != next_commit_ID) {
|
|
brelse(bh);
|
|
break;
|
|
}
|
|
|
|
/* 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:
|
|
/* Verify checksum first */
|
|
if (jbd2_journal_has_csum_v2or3(journal))
|
|
descr_csum_size =
|
|
sizeof(struct jbd2_journal_block_tail);
|
|
if (descr_csum_size > 0 &&
|
|
!jbd2_descriptor_block_csum_verify(journal,
|
|
bh->b_data)) {
|
|
/*
|
|
* PASS_SCAN can see stale blocks due to lazy
|
|
* journal init. Don't error out on those yet.
|
|
*/
|
|
if (pass != PASS_SCAN) {
|
|
pr_err("JBD2: Invalid checksum recovering block %lu in log\n",
|
|
next_log_block);
|
|
err = -EFSBADCRC;
|
|
brelse(bh);
|
|
goto failed;
|
|
}
|
|
need_check_commit_time = true;
|
|
jbd_debug(1,
|
|
"invalid descriptor block found in %lu\n",
|
|
next_log_block);
|
|
}
|
|
|
|
/* If it is a valid descriptor block, replay it
|
|
* in pass REPLAY; if journal_checksums enabled, then
|
|
* calculate checksums in PASS_SCAN, otherwise,
|
|
* just skip over the blocks it describes. */
|
|
if (pass != PASS_REPLAY) {
|
|
if (pass == PASS_SCAN &&
|
|
jbd2_has_feature_checksum(journal) &&
|
|
!need_check_commit_time &&
|
|
!info->end_transaction) {
|
|
if (calc_chksums(journal, bh,
|
|
&next_log_block,
|
|
&crc32_sum)) {
|
|
put_bh(bh);
|
|
break;
|
|
}
|
|
put_bh(bh);
|
|
continue;
|
|
}
|
|
next_log_block += count_tags(journal, bh);
|
|
wrap(journal, next_log_block);
|
|
put_bh(bh);
|
|
continue;
|
|
}
|
|
|
|
/* A descriptor block: we can now write all of
|
|
* the data blocks. Yay, useful work is finally
|
|
* getting done here! */
|
|
|
|
tagp = &bh->b_data[sizeof(journal_header_t)];
|
|
while ((tagp - bh->b_data + tag_bytes)
|
|
<= journal->j_blocksize - descr_csum_size) {
|
|
unsigned long io_block;
|
|
|
|
tag = (journal_block_tag_t *) tagp;
|
|
flags = be16_to_cpu(tag->t_flags);
|
|
|
|
io_block = next_log_block++;
|
|
wrap(journal, next_log_block);
|
|
err = jread(&obh, journal, io_block);
|
|
if (err) {
|
|
/* Recover what we can, but
|
|
* report failure at the end. */
|
|
success = err;
|
|
printk(KERN_ERR
|
|
"JBD2: IO error %d recovering "
|
|
"block %ld in log\n",
|
|
err, io_block);
|
|
} else {
|
|
unsigned long long blocknr;
|
|
|
|
J_ASSERT(obh != NULL);
|
|
blocknr = read_tag_block(journal,
|
|
tag);
|
|
|
|
/* If the block has been
|
|
* revoked, then we're all done
|
|
* here. */
|
|
if (jbd2_journal_test_revoke
|
|
(journal, blocknr,
|
|
next_commit_ID)) {
|
|
brelse(obh);
|
|
++info->nr_revoke_hits;
|
|
goto skip_write;
|
|
}
|
|
|
|
/* Look for block corruption */
|
|
if (!jbd2_block_tag_csum_verify(
|
|
journal, tag, obh->b_data,
|
|
be32_to_cpu(tmp->h_sequence))) {
|
|
brelse(obh);
|
|
success = -EFSBADCRC;
|
|
printk(KERN_ERR "JBD2: Invalid "
|
|
"checksum recovering "
|
|
"data block %llu in "
|
|
"log\n", blocknr);
|
|
block_error = 1;
|
|
goto skip_write;
|
|
}
|
|
|
|
/* Find a buffer for the new
|
|
* data being restored */
|
|
nbh = __getblk(journal->j_fs_dev,
|
|
blocknr,
|
|
journal->j_blocksize);
|
|
if (nbh == NULL) {
|
|
printk(KERN_ERR
|
|
"JBD2: Out of memory "
|
|
"during recovery.\n");
|
|
err = -ENOMEM;
|
|
brelse(bh);
|
|
brelse(obh);
|
|
goto failed;
|
|
}
|
|
|
|
lock_buffer(nbh);
|
|
memcpy(nbh->b_data, obh->b_data,
|
|
journal->j_blocksize);
|
|
if (flags & JBD2_FLAG_ESCAPE) {
|
|
*((__be32 *)nbh->b_data) =
|
|
cpu_to_be32(JBD2_MAGIC_NUMBER);
|
|
}
|
|
|
|
BUFFER_TRACE(nbh, "marking dirty");
|
|
set_buffer_uptodate(nbh);
|
|
mark_buffer_dirty(nbh);
|
|
BUFFER_TRACE(nbh, "marking uptodate");
|
|
++info->nr_replays;
|
|
/* ll_rw_block(WRITE, 1, &nbh); */
|
|
unlock_buffer(nbh);
|
|
brelse(obh);
|
|
brelse(nbh);
|
|
}
|
|
|
|
skip_write:
|
|
tagp += tag_bytes;
|
|
if (!(flags & JBD2_FLAG_SAME_UUID))
|
|
tagp += 16;
|
|
|
|
if (flags & JBD2_FLAG_LAST_TAG)
|
|
break;
|
|
}
|
|
|
|
brelse(bh);
|
|
continue;
|
|
|
|
case JBD2_COMMIT_BLOCK:
|
|
/* How to differentiate between interrupted commit
|
|
* and journal corruption ?
|
|
*
|
|
* {nth transaction}
|
|
* Checksum Verification Failed
|
|
* |
|
|
* ____________________
|
|
* | |
|
|
* async_commit sync_commit
|
|
* | |
|
|
* | GO TO NEXT "Journal Corruption"
|
|
* | TRANSACTION
|
|
* |
|
|
* {(n+1)th transanction}
|
|
* |
|
|
* _______|______________
|
|
* | |
|
|
* Commit block found Commit block not found
|
|
* | |
|
|
* "Journal Corruption" |
|
|
* _____________|_________
|
|
* | |
|
|
* nth trans corrupt OR nth trans
|
|
* and (n+1)th interrupted interrupted
|
|
* before commit block
|
|
* could reach the disk.
|
|
* (Cannot find the difference in above
|
|
* mentioned conditions. Hence assume
|
|
* "Interrupted Commit".)
|
|
*/
|
|
commit_time = be64_to_cpu(
|
|
((struct commit_header *)bh->b_data)->h_commit_sec);
|
|
/*
|
|
* If need_check_commit_time is set, it means we are in
|
|
* PASS_SCAN and csum verify failed before. If
|
|
* commit_time is increasing, it's the same journal,
|
|
* otherwise it is stale journal block, just end this
|
|
* recovery.
|
|
*/
|
|
if (need_check_commit_time) {
|
|
if (commit_time >= last_trans_commit_time) {
|
|
pr_err("JBD2: Invalid checksum found in transaction %u\n",
|
|
next_commit_ID);
|
|
err = -EFSBADCRC;
|
|
brelse(bh);
|
|
goto failed;
|
|
}
|
|
ignore_crc_mismatch:
|
|
/*
|
|
* It likely does not belong to same journal,
|
|
* just end this recovery with success.
|
|
*/
|
|
jbd_debug(1, "JBD2: Invalid checksum ignored in transaction %u, likely stale data\n",
|
|
next_commit_ID);
|
|
err = 0;
|
|
brelse(bh);
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Found an expected commit block: if checksums
|
|
* are present, verify them in PASS_SCAN; else not
|
|
* much to do other than move on to the next sequence
|
|
* number.
|
|
*/
|
|
if (pass == PASS_SCAN &&
|
|
jbd2_has_feature_checksum(journal)) {
|
|
struct commit_header *cbh =
|
|
(struct commit_header *)bh->b_data;
|
|
unsigned found_chksum =
|
|
be32_to_cpu(cbh->h_chksum[0]);
|
|
|
|
if (info->end_transaction) {
|
|
journal->j_failed_commit =
|
|
info->end_transaction;
|
|
brelse(bh);
|
|
break;
|
|
}
|
|
|
|
/* Neither checksum match nor unused? */
|
|
if (!((crc32_sum == found_chksum &&
|
|
cbh->h_chksum_type ==
|
|
JBD2_CRC32_CHKSUM &&
|
|
cbh->h_chksum_size ==
|
|
JBD2_CRC32_CHKSUM_SIZE) ||
|
|
(cbh->h_chksum_type == 0 &&
|
|
cbh->h_chksum_size == 0 &&
|
|
found_chksum == 0)))
|
|
goto chksum_error;
|
|
|
|
crc32_sum = ~0;
|
|
}
|
|
if (pass == PASS_SCAN &&
|
|
!jbd2_commit_block_csum_verify(journal,
|
|
bh->b_data)) {
|
|
chksum_error:
|
|
if (commit_time < last_trans_commit_time)
|
|
goto ignore_crc_mismatch;
|
|
info->end_transaction = next_commit_ID;
|
|
|
|
if (!jbd2_has_feature_async_commit(journal)) {
|
|
journal->j_failed_commit =
|
|
next_commit_ID;
|
|
brelse(bh);
|
|
break;
|
|
}
|
|
}
|
|
if (pass == PASS_SCAN)
|
|
last_trans_commit_time = commit_time;
|
|
brelse(bh);
|
|
next_commit_ID++;
|
|
continue;
|
|
|
|
case JBD2_REVOKE_BLOCK:
|
|
/*
|
|
* Check revoke block crc in pass_scan, if csum verify
|
|
* failed, check commit block time later.
|
|
*/
|
|
if (pass == PASS_SCAN &&
|
|
!jbd2_descriptor_block_csum_verify(journal,
|
|
bh->b_data)) {
|
|
jbd_debug(1, "JBD2: invalid revoke block found in %lu\n",
|
|
next_log_block);
|
|
need_check_commit_time = true;
|
|
}
|
|
/* If we aren't in the REVOKE pass, then we can
|
|
* just skip over this block. */
|
|
if (pass != PASS_REVOKE) {
|
|
brelse(bh);
|
|
continue;
|
|
}
|
|
|
|
err = scan_revoke_records(journal, bh,
|
|
next_commit_ID, info);
|
|
brelse(bh);
|
|
if (err)
|
|
goto failed;
|
|
continue;
|
|
|
|
default:
|
|
jbd_debug(3, "Unrecognised magic %d, end of scan.\n",
|
|
blocktype);
|
|
brelse(bh);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
done:
|
|
/*
|
|
* We broke out of the log scan loop: either we came to the
|
|
* known end of the log or we found an unexpected block in the
|
|
* log. If the latter happened, then we know that the "current"
|
|
* transaction marks the end of the valid log.
|
|
*/
|
|
|
|
if (pass == PASS_SCAN) {
|
|
if (!info->end_transaction)
|
|
info->end_transaction = next_commit_ID;
|
|
} else {
|
|
/* It's really bad news if different passes end up at
|
|
* different places (but possible due to IO errors). */
|
|
if (info->end_transaction != next_commit_ID) {
|
|
printk(KERN_ERR "JBD2: recovery pass %d ended at "
|
|
"transaction %u, expected %u\n",
|
|
pass, next_commit_ID, info->end_transaction);
|
|
if (!success)
|
|
success = -EIO;
|
|
}
|
|
}
|
|
|
|
if (jbd2_has_feature_fast_commit(journal) && pass != PASS_REVOKE) {
|
|
err = fc_do_one_pass(journal, info, pass);
|
|
if (err)
|
|
success = err;
|
|
}
|
|
|
|
if (block_error && success == 0)
|
|
success = -EIO;
|
|
return success;
|
|
|
|
failed:
|
|
return err;
|
|
}
|
|
|
|
/* Scan a revoke record, marking all blocks mentioned as revoked. */
|
|
|
|
static int scan_revoke_records(journal_t *journal, struct buffer_head *bh,
|
|
tid_t sequence, struct recovery_info *info)
|
|
{
|
|
jbd2_journal_revoke_header_t *header;
|
|
int offset, max;
|
|
int csum_size = 0;
|
|
__u32 rcount;
|
|
int record_len = 4;
|
|
|
|
header = (jbd2_journal_revoke_header_t *) bh->b_data;
|
|
offset = sizeof(jbd2_journal_revoke_header_t);
|
|
rcount = be32_to_cpu(header->r_count);
|
|
|
|
if (jbd2_journal_has_csum_v2or3(journal))
|
|
csum_size = sizeof(struct jbd2_journal_block_tail);
|
|
if (rcount > journal->j_blocksize - csum_size)
|
|
return -EINVAL;
|
|
max = rcount;
|
|
|
|
if (jbd2_has_feature_64bit(journal))
|
|
record_len = 8;
|
|
|
|
while (offset + record_len <= max) {
|
|
unsigned long long blocknr;
|
|
int err;
|
|
|
|
if (record_len == 4)
|
|
blocknr = be32_to_cpu(* ((__be32 *) (bh->b_data+offset)));
|
|
else
|
|
blocknr = be64_to_cpu(* ((__be64 *) (bh->b_data+offset)));
|
|
offset += record_len;
|
|
err = jbd2_journal_set_revoke(journal, blocknr, sequence);
|
|
if (err)
|
|
return err;
|
|
++info->nr_revokes;
|
|
}
|
|
return 0;
|
|
}
|