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jbd2: clear JBD2_ABORT flag before journal_reset to update log tail info when load journal 

[ Upstream commit a09decff5c32060639a685581c380f51b14e1fc2 ]

If the journal is dirty when the filesystem is mounted, jbd2 will replay
the journal but the journal superblock will not be updated by
journal_reset() because JBD2_ABORT flag is still set (it was set in
journal_init_common()). This is problematic because when a new transaction
is then committed, it will be recorded in block 1 (journal->j_tail was set
to 1 in journal_reset()). If unclean shutdown happens again before the
journal superblock is updated, the new recorded transaction will not be
replayed during the next mount (because of stale sb->s_start and
sb->s_sequence values) which can lead to filesystem corruption.

Fixes: 85e0c4e89c ("jbd2: if the journal is aborted then don't allow update of the log tail")
Signed-off-by: Kai Li <li.kai4@h3c.com>
Link: https://lore.kernel.org/r/20200111022542.5008-1-li.kai4@h3c.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kai Li 2020-01-11 10:25:42 +08:00 committed by Greg Kroah-Hartman
parent 56953ccd7f
commit c982320078
1 changed files with 5 additions and 1 deletions
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6
fs/jbd2/journal.c
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@ -1682,6 +1682,11 @@ int jbd2_journal_load(journal_t *journal)
journal->j_devname);
return -EFSCORRUPTED;
}
/*
* clear JBD2_ABORT flag initialized in journal_init_common
* here to update log tail information with the newest seq.
*/
journal->j_flags &= ~JBD2_ABORT;
/* OK, we've finished with the dynamic journal bits:
* reinitialise the dynamic contents of the superblock in memory
@ -1689,7 +1694,6 @@ int jbd2_journal_load(journal_t *journal)
if (journal_reset(journal))
goto recovery_error;
journal->j_flags &= ~JBD2_ABORT;
journal->j_flags |= JBD2_LOADED;
return 0;