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xfs: remove the XLOG_STATE_DO_CALLBACK state

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XLOG_STATE_DO_CALLBACK is only entered through XLOG_STATE_DONE_SYNC
and just used in a single debug check.  Remove the flag and thus
simplify the calling conventions for xlog_state_do_callback and
xlog_state_iodone_process_iclog.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Christoph Hellwig 2019-10-14 10:36:43 -07:00 committed by Darrick J. Wong
parent 1858bb0bec
commit 4b29ab04ab
2 changed files with 11 additions and 66 deletions
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76
fs/xfs/xfs_log.c
View File

@ -2750,7 +2750,6 @@ static bool
xlog_state_iodone_process_iclog(
struct xlog *log,
struct xlog_in_core *iclog,
struct xlog_in_core *completed_iclog,
bool *ioerror)
{
xfs_lsn_t lowest_lsn;
@ -2768,17 +2767,16 @@ xlog_state_iodone_process_iclog(
* Between marking a filesystem SHUTDOWN and stopping the log,
* we do flush all iclogs to disk (if there wasn't a log I/O
* error). So, we do want things to go smoothly in case of just
* a SHUTDOWN w/o a LOG_IO_ERROR.
* a SHUTDOWN w/o a LOG_IO_ERROR.
*/
*ioerror = true;
return false;
case XLOG_STATE_DONE_SYNC:
case XLOG_STATE_DO_CALLBACK:
/*
* Now that we have an iclog that is in either the DO_CALLBACK
* or DONE_SYNC states, do one more check here to see if we have
* chased our tail around. If this is not the lowest lsn iclog,
* then we will leave it for another completion to process.
* Now that we have an iclog that is in the DONE_SYNC state, do
* one more check here to see if we have chased our tail around.
* If this is not the lowest lsn iclog, then we will leave it
* for another completion to process.
*/
header_lsn = be64_to_cpu(iclog->ic_header.h_lsn);
lowest_lsn = xlog_get_lowest_lsn(log);
@ -2789,15 +2787,9 @@ xlog_state_iodone_process_iclog(
default:
/*
* Can only perform callbacks in order. Since this iclog is not
* in the DONE_SYNC or DO_CALLBACK states, we skip the rest and
* just try to clean up. If we set our iclog to DO_CALLBACK, we
* will not process it when we retry since a previous iclog is
* in the CALLBACK and the state cannot change since we are
* holding l_icloglock.
* in the DONE_SYNC state, we skip the rest and just try to
* clean up.
*/
if (completed_iclog &&
(completed_iclog->ic_state == XLOG_STATE_DONE_SYNC))
completed_iclog->ic_state = XLOG_STATE_DO_CALLBACK;
return true;
}
}
@ -2838,54 +2830,13 @@ xlog_state_do_iclog_callbacks(
spin_unlock(&iclog->ic_callback_lock);
}
#ifdef DEBUG
/*
* Make one last gasp attempt to see if iclogs are being left in limbo. If the
* above loop finds an iclog earlier than the current iclog and in one of the
* syncing states, the current iclog is put into DO_CALLBACK and the callbacks
* are deferred to the completion of the earlier iclog. Walk the iclogs in order
* and make sure that no iclog is in DO_CALLBACK unless an earlier iclog is in
* one of the syncing states.
*/
static void
xlog_state_callback_check_state(
struct xlog *log)
{
struct xlog_in_core *first_iclog = log->l_iclog;
struct xlog_in_core *iclog = first_iclog;
do {
ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK);
/*
* Terminate the loop if iclogs are found in states
* which will cause other threads to clean up iclogs.
*
* SYNCING - i/o completion will go through logs
* DONE_SYNC - interrupt thread should be waiting for
* l_icloglock
* IOERROR - give up hope all ye who enter here
*/
if (iclog->ic_state == XLOG_STATE_WANT_SYNC ||
iclog->ic_state == XLOG_STATE_SYNCING ||
iclog->ic_state == XLOG_STATE_DONE_SYNC ||
iclog->ic_state == XLOG_STATE_IOERROR )
break;
iclog = iclog->ic_next;
} while (first_iclog != iclog);
}
#else
#define xlog_state_callback_check_state(l) ((void)0)
#endif
STATIC void
xlog_state_do_callback(
struct xlog *log,
bool aborted,
struct xlog_in_core *ciclog)
bool aborted)
{
struct xlog_in_core *iclog;
struct xlog_in_core *first_iclog;
bool did_callbacks = false;
bool cycled_icloglock;
bool ioerror;
int flushcnt = 0;
@ -2909,7 +2860,7 @@ xlog_state_do_callback(
do {
if (xlog_state_iodone_process_iclog(log, iclog,
ciclog, &ioerror))
&ioerror))
break;
if (iclog->ic_state != XLOG_STATE_CALLBACK &&
@ -2929,8 +2880,6 @@ xlog_state_do_callback(
iclog = iclog->ic_next;
} while (first_iclog != iclog);
did_callbacks |= cycled_icloglock;
if (repeats > 5000) {
flushcnt += repeats;
repeats = 0;
@ -2940,9 +2889,6 @@ xlog_state_do_callback(
}
} while (!ioerror && cycled_icloglock);
if (did_callbacks)
xlog_state_callback_check_state(log);
if (log->l_iclog->ic_state == XLOG_STATE_ACTIVE ||
log->l_iclog->ic_state == XLOG_STATE_IOERROR)
wake_up_all(&log->l_flush_wait);
@ -2993,7 +2939,7 @@ xlog_state_done_syncing(
*/
wake_up_all(&iclog->ic_write_wait);
spin_unlock(&log->l_icloglock);
xlog_state_do_callback(log, aborted, iclog); /* also cleans log */
xlog_state_do_callback(log, aborted); /* also cleans log */
} /* xlog_state_done_syncing */
@ -3987,7 +3933,7 @@ xfs_log_force_umount(
spin_lock(&log->l_cilp->xc_push_lock);
wake_up_all(&log->l_cilp->xc_commit_wait);
spin_unlock(&log->l_cilp->xc_push_lock);
xlog_state_do_callback(log, true, NULL);
xlog_state_do_callback(log, true);
/* return non-zero if log IOERROR transition had already happened */
return retval;

1
fs/xfs/xfs_log_priv.h
View File

@ -45,7 +45,6 @@ enum xlog_iclog_state {
XLOG_STATE_WANT_SYNC, /* Want to sync this iclog; no more writes */
XLOG_STATE_SYNCING, /* This IC log is syncing */
XLOG_STATE_DONE_SYNC, /* Done syncing to disk */
XLOG_STATE_DO_CALLBACK, /* Process callback functions */
XLOG_STATE_CALLBACK, /* Callback functions now */
XLOG_STATE_DIRTY, /* Dirty IC log, not ready for ACTIVE status */
XLOG_STATE_IOERROR, /* IO error happened in sync'ing log */