diff options
| -rw-r--r-- | fs/xfs/xfs_log.c | 38 |
1 files changed, 26 insertions, 12 deletions
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c index e8fba92..2be0191 100644 --- a/fs/xfs/xfs_log.c +++ b/fs/xfs/xfs_log.c @@ -745,9 +745,16 @@ xfs_log_move_tail(xfs_mount_t *mp, /* * Determine if we have a transaction that has gone to disk - * that needs to be covered. Log activity needs to be idle (no AIL and - * nothing in the iclogs). And, we need to be in the right state indicating - * something has gone out. + * that needs to be covered. To begin the transition to the idle state + * firstly the log needs to be idle (no AIL and nothing in the iclogs). + * If we are then in a state where covering is needed, the caller is informed + * that dummy transactions are required to move the log into the idle state. + * + * Because this is called as part of the sync process, we should also indicate + * that dummy transactions should be issued in anything but the covered or + * idle states. This ensures that the log tail is accurately reflected in + * the log at the end of the sync, hence if a crash occurrs avoids replay + * of transactions where the metadata is already on disk. */ int xfs_log_need_covered(xfs_mount_t *mp) @@ -759,17 +766,24 @@ xfs_log_need_covered(xfs_mount_t *mp) return 0; spin_lock(&log->l_icloglock); - if (((log->l_covered_state == XLOG_STATE_COVER_NEED) || - (log->l_covered_state == XLOG_STATE_COVER_NEED2)) - && !xfs_trans_ail_tail(log->l_ailp) - && xlog_iclogs_empty(log)) { - if (log->l_covered_state == XLOG_STATE_COVER_NEED) - log->l_covered_state = XLOG_STATE_COVER_DONE; - else { - ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2); - log->l_covered_state = XLOG_STATE_COVER_DONE2; + switch (log->l_covered_state) { + case XLOG_STATE_COVER_DONE: + case XLOG_STATE_COVER_DONE2: + case XLOG_STATE_COVER_IDLE: + break; + case XLOG_STATE_COVER_NEED: + case XLOG_STATE_COVER_NEED2: + if (!xfs_trans_ail_tail(log->l_ailp) && + xlog_iclogs_empty(log)) { + if (log->l_covered_state == XLOG_STATE_COVER_NEED) + log->l_covered_state = XLOG_STATE_COVER_DONE; + else + log->l_covered_state = XLOG_STATE_COVER_DONE2; } + /* FALLTHRU */ + default: needed = 1; + break; } spin_unlock(&log->l_icloglock); return needed; |
