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| author | Jan Kara <jack@suse.cz> | 2013-03-27 17:30:59 +0100 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2013-03-27 17:30:59 +0100 |
| commit | e678a4f0f50d4fa4f7aaa6de8eb3f071513356a0 (patch) | |
| tree | 94eafb0a1181006633817a65038d4923cc3e647a /fs/jbd | |
| parent | e643692138cfa33528f054b071ba2583509bb217 (diff) | |
| download | linux-e678a4f0f50d4fa4f7aaa6de8eb3f071513356a0.tar.bz2 | |
jbd: don't wait (forever) for stale tid caused by wraparound
In the case where an inode has a very stale transaction id (tid) in
i_datasync_tid or i_sync_tid, it's possible that after a very large
(2**31) number of transactions, that the tid number space might wrap,
causing tid_geq()'s calculations to fail.
Commit d9b0193 "jbd: fix fsync() tid wraparound bug" attempted to fix
this problem, but it only avoided kjournald spinning forever by fixing
the logic in jbd_log_start_commit().
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/jbd')
| -rw-r--r-- | fs/jbd/journal.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c index 81cc7eaff863..81880c6d6b5e 100644 --- a/fs/jbd/journal.c +++ b/fs/jbd/journal.c @@ -564,6 +564,16 @@ int log_wait_commit(journal_t *journal, tid_t tid) spin_unlock(&journal->j_state_lock); #endif spin_lock(&journal->j_state_lock); + /* + * Not running or committing trans? Must be already committed. This + * saves us from waiting for a *long* time when tid overflows. + */ + if (!((journal->j_running_transaction && + journal->j_running_transaction->t_tid == tid) || + (journal->j_committing_transaction && + journal->j_committing_transaction->t_tid == tid))) + goto out_unlock; + if (!tid_geq(journal->j_commit_waited, tid)) journal->j_commit_waited = tid; while (tid_gt(tid, journal->j_commit_sequence)) { @@ -575,6 +585,7 @@ int log_wait_commit(journal_t *journal, tid_t tid) !tid_gt(tid, journal->j_commit_sequence)); spin_lock(&journal->j_state_lock); } +out_unlock: spin_unlock(&journal->j_state_lock); if (unlikely(is_journal_aborted(journal))) { |