| Message ID | 20200316144233.900390-13-hch@lst.de (mailing list archive) |
|---|---|
| State | Deferred, archived |
| Headers | show |
| Series | [01/14] xfs: merge xlog_cil_push into xlog_cil_push_work | expand |
On Mon, Mar 16, 2020 at 03:42:31PM +0100, Christoph Hellwig wrote: > Merge xlog_state_set_callback into its only caller, which makes the iclog > I/O completion handling a little easier to follow. > > Signed-off-by: Christoph Hellwig <hch@lst.de> Looks ok, Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> --D > --- > fs/xfs/xfs_log.c | 74 +++++++++++++++++++++--------------------------- > 1 file changed, 33 insertions(+), 41 deletions(-) > > diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c > index 899c324d07e2..865dd1e08679 100644 > --- a/fs/xfs/xfs_log.c > +++ b/fs/xfs/xfs_log.c > @@ -2645,46 +2645,6 @@ xlog_get_lowest_lsn( > return lowest_lsn; > } > > -/* > - * Completion of a iclog IO does not imply that a transaction has completed, as > - * transactions can be large enough to span many iclogs. We cannot change the > - * tail of the log half way through a transaction as this may be the only > - * transaction in the log and moving the tail to point to the middle of it > - * will prevent recovery from finding the start of the transaction. Hence we > - * should only update the last_sync_lsn if this iclog contains transaction > - * completion callbacks on it. > - * > - * We have to do this before we drop the icloglock to ensure we are the only one > - * that can update it. > - * > - * If we are moving the last_sync_lsn forwards, we also need to ensure we kick > - * the reservation grant head pushing. This is due to the fact that the push > - * target is bound by the current last_sync_lsn value. Hence if we have a large > - * amount of log space bound up in this committing transaction then the > - * last_sync_lsn value may be the limiting factor preventing tail pushing from > - * freeing space in the log. Hence once we've updated the last_sync_lsn we > - * should push the AIL to ensure the push target (and hence the grant head) is > - * no longer bound by the old log head location and can move forwards and make > - * progress again. > - */ > -static void > -xlog_state_set_callback( > - struct xlog *log, > - struct xlog_in_core *iclog, > - xfs_lsn_t header_lsn) > -{ > - iclog->ic_state = XLOG_STATE_CALLBACK; > - > - ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn), > - header_lsn) <= 0); > - > - if (list_empty_careful(&iclog->ic_callbacks)) > - return; > - > - atomic64_set(&log->l_last_sync_lsn, header_lsn); > - xlog_grant_push_ail(log, 0); > -} > - > /* > * Keep processing entries in the iclog callback list until we come around and > * it is empty. We need to atomically see that the list is empty and change the > @@ -2741,7 +2701,39 @@ xlog_state_iodone_process_iclog( > if (lowest_lsn && XFS_LSN_CMP(lowest_lsn, header_lsn) < 0) > return false; > > - xlog_state_set_callback(log, iclog, header_lsn); > + iclog->ic_state = XLOG_STATE_CALLBACK; > + > + ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn), > + header_lsn) <= 0); > + > + /* > + * Completion of an iclog I/O does not imply that a transaction has > + * completed, as transactions can be large enough to span multiple > + * iclogs. We cannot change the tail of the log half way through a > + * transaction as this may be the only transaction in the log and moving > + * the tail to point to the middle of it will prevent recovery from > + * finding the start of the transaction. Hence we should only update > + * the last_sync_lsn if this iclog contains transaction completion > + * callbacks on it. > + * > + * We have to do this before we drop the icloglock to ensure we are the > + * only one that can update it. > + * > + * If we are moving last_sync_lsn forwards, we also need to ensure we > + * kick the reservation grant head pushing. This is due to the fact that > + * the push target is bound by the current last_sync_lsn value. If we > + * have a large amount of log space bound up in this committing > + * transaction then the last_sync_lsn value may be the limiting factor > + * preventing tail pushing from freeing space in the log. Hence once > + * we've updated the last_sync_lsn we should push the AIL to ensure the > + * push target (and hence the grant head) is no longer bound by the old > + * log head location and can move forwards and make progress again. > + */ > + if (!list_empty_careful(&iclog->ic_callbacks)) { > + atomic64_set(&log->l_last_sync_lsn, header_lsn); > + xlog_grant_push_ail(log, 0); > + } > + > xlog_state_do_iclog_callbacks(log, iclog); > > iclog->ic_state = XLOG_STATE_DIRTY; > -- > 2.24.1 >
On Mon, Mar 16, 2020 at 03:42:31PM +0100, Christoph Hellwig wrote: > Merge xlog_state_set_callback into its only caller, which makes the iclog > I/O completion handling a little easier to follow. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- Reviewed-by: Brian Foster <bfoster@redhat.com> > fs/xfs/xfs_log.c | 74 +++++++++++++++++++++--------------------------- > 1 file changed, 33 insertions(+), 41 deletions(-) > > diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c > index 899c324d07e2..865dd1e08679 100644 > --- a/fs/xfs/xfs_log.c > +++ b/fs/xfs/xfs_log.c > @@ -2645,46 +2645,6 @@ xlog_get_lowest_lsn( > return lowest_lsn; > } > > -/* > - * Completion of a iclog IO does not imply that a transaction has completed, as > - * transactions can be large enough to span many iclogs. We cannot change the > - * tail of the log half way through a transaction as this may be the only > - * transaction in the log and moving the tail to point to the middle of it > - * will prevent recovery from finding the start of the transaction. Hence we > - * should only update the last_sync_lsn if this iclog contains transaction > - * completion callbacks on it. > - * > - * We have to do this before we drop the icloglock to ensure we are the only one > - * that can update it. > - * > - * If we are moving the last_sync_lsn forwards, we also need to ensure we kick > - * the reservation grant head pushing. This is due to the fact that the push > - * target is bound by the current last_sync_lsn value. Hence if we have a large > - * amount of log space bound up in this committing transaction then the > - * last_sync_lsn value may be the limiting factor preventing tail pushing from > - * freeing space in the log. Hence once we've updated the last_sync_lsn we > - * should push the AIL to ensure the push target (and hence the grant head) is > - * no longer bound by the old log head location and can move forwards and make > - * progress again. > - */ > -static void > -xlog_state_set_callback( > - struct xlog *log, > - struct xlog_in_core *iclog, > - xfs_lsn_t header_lsn) > -{ > - iclog->ic_state = XLOG_STATE_CALLBACK; > - > - ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn), > - header_lsn) <= 0); > - > - if (list_empty_careful(&iclog->ic_callbacks)) > - return; > - > - atomic64_set(&log->l_last_sync_lsn, header_lsn); > - xlog_grant_push_ail(log, 0); > -} > - > /* > * Keep processing entries in the iclog callback list until we come around and > * it is empty. We need to atomically see that the list is empty and change the > @@ -2741,7 +2701,39 @@ xlog_state_iodone_process_iclog( > if (lowest_lsn && XFS_LSN_CMP(lowest_lsn, header_lsn) < 0) > return false; > > - xlog_state_set_callback(log, iclog, header_lsn); > + iclog->ic_state = XLOG_STATE_CALLBACK; > + > + ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn), > + header_lsn) <= 0); > + > + /* > + * Completion of an iclog I/O does not imply that a transaction has > + * completed, as transactions can be large enough to span multiple > + * iclogs. We cannot change the tail of the log half way through a > + * transaction as this may be the only transaction in the log and moving > + * the tail to point to the middle of it will prevent recovery from > + * finding the start of the transaction. Hence we should only update > + * the last_sync_lsn if this iclog contains transaction completion > + * callbacks on it. > + * > + * We have to do this before we drop the icloglock to ensure we are the > + * only one that can update it. > + * > + * If we are moving last_sync_lsn forwards, we also need to ensure we > + * kick the reservation grant head pushing. This is due to the fact that > + * the push target is bound by the current last_sync_lsn value. If we > + * have a large amount of log space bound up in this committing > + * transaction then the last_sync_lsn value may be the limiting factor > + * preventing tail pushing from freeing space in the log. Hence once > + * we've updated the last_sync_lsn we should push the AIL to ensure the > + * push target (and hence the grant head) is no longer bound by the old > + * log head location and can move forwards and make progress again. > + */ > + if (!list_empty_careful(&iclog->ic_callbacks)) { > + atomic64_set(&log->l_last_sync_lsn, header_lsn); > + xlog_grant_push_ail(log, 0); > + } > + > xlog_state_do_iclog_callbacks(log, iclog); > > iclog->ic_state = XLOG_STATE_DIRTY; > -- > 2.24.1 >
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c index 899c324d07e2..865dd1e08679 100644 --- a/fs/xfs/xfs_log.c +++ b/fs/xfs/xfs_log.c @@ -2645,46 +2645,6 @@ xlog_get_lowest_lsn( return lowest_lsn; } -/* - * Completion of a iclog IO does not imply that a transaction has completed, as - * transactions can be large enough to span many iclogs. We cannot change the - * tail of the log half way through a transaction as this may be the only - * transaction in the log and moving the tail to point to the middle of it - * will prevent recovery from finding the start of the transaction. Hence we - * should only update the last_sync_lsn if this iclog contains transaction - * completion callbacks on it. - * - * We have to do this before we drop the icloglock to ensure we are the only one - * that can update it. - * - * If we are moving the last_sync_lsn forwards, we also need to ensure we kick - * the reservation grant head pushing. This is due to the fact that the push - * target is bound by the current last_sync_lsn value. Hence if we have a large - * amount of log space bound up in this committing transaction then the - * last_sync_lsn value may be the limiting factor preventing tail pushing from - * freeing space in the log. Hence once we've updated the last_sync_lsn we - * should push the AIL to ensure the push target (and hence the grant head) is - * no longer bound by the old log head location and can move forwards and make - * progress again. - */ -static void -xlog_state_set_callback( - struct xlog *log, - struct xlog_in_core *iclog, - xfs_lsn_t header_lsn) -{ - iclog->ic_state = XLOG_STATE_CALLBACK; - - ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn), - header_lsn) <= 0); - - if (list_empty_careful(&iclog->ic_callbacks)) - return; - - atomic64_set(&log->l_last_sync_lsn, header_lsn); - xlog_grant_push_ail(log, 0); -} - /* * Keep processing entries in the iclog callback list until we come around and * it is empty. We need to atomically see that the list is empty and change the @@ -2741,7 +2701,39 @@ xlog_state_iodone_process_iclog( if (lowest_lsn && XFS_LSN_CMP(lowest_lsn, header_lsn) < 0) return false; - xlog_state_set_callback(log, iclog, header_lsn); + iclog->ic_state = XLOG_STATE_CALLBACK; + + ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn), + header_lsn) <= 0); + + /* + * Completion of an iclog I/O does not imply that a transaction has + * completed, as transactions can be large enough to span multiple + * iclogs. We cannot change the tail of the log half way through a + * transaction as this may be the only transaction in the log and moving + * the tail to point to the middle of it will prevent recovery from + * finding the start of the transaction. Hence we should only update + * the last_sync_lsn if this iclog contains transaction completion + * callbacks on it. + * + * We have to do this before we drop the icloglock to ensure we are the + * only one that can update it. + * + * If we are moving last_sync_lsn forwards, we also need to ensure we + * kick the reservation grant head pushing. This is due to the fact that + * the push target is bound by the current last_sync_lsn value. If we + * have a large amount of log space bound up in this committing + * transaction then the last_sync_lsn value may be the limiting factor + * preventing tail pushing from freeing space in the log. Hence once + * we've updated the last_sync_lsn we should push the AIL to ensure the + * push target (and hence the grant head) is no longer bound by the old + * log head location and can move forwards and make progress again. + */ + if (!list_empty_careful(&iclog->ic_callbacks)) { + atomic64_set(&log->l_last_sync_lsn, header_lsn); + xlog_grant_push_ail(log, 0); + } + xlog_state_do_iclog_callbacks(log, iclog); iclog->ic_state = XLOG_STATE_DIRTY;
Merge xlog_state_set_callback into its only caller, which makes the iclog I/O completion handling a little easier to follow. Signed-off-by: Christoph Hellwig <hch@lst.de> --- fs/xfs/xfs_log.c | 74 +++++++++++++++++++++--------------------------- 1 file changed, 33 insertions(+), 41 deletions(-)