Since superblock is updated infrequently, we do a simple trim of log
disk (a synchronous trim)
Signed-off-by: Shaohua Li <shli@xxxxxx>
---
drivers/md/raid5-cache.c | 30 +++++++++++++++++++++++++++++-
1 file changed, 29 insertions(+), 1 deletion(-)
diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index 27fb513..410b85b 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -639,6 +639,34 @@ static void r5l_kick_io_unit(struct r5l_log *log)
}
static void r5l_write_super(struct r5l_log *log, sector_t cp);
+static void r5l_write_super_and_discard_space(struct r5l_log *log,
+ sector_t end)
+{
+ struct block_device *bdev = log->rdev->bdev;
+
+ r5l_write_super(log, end);
+
+ if (!blk_queue_discard(bdev_get_queue(bdev)))
+ return;
+
+ /* discard destroy old data in log, so force a super update */
+ md_update_sb(log->rdev->mddev, 1);
+
+ if (log->last_checkpoint < end) {
+ blkdev_issue_discard(bdev,
+ log->last_checkpoint + log->rdev->data_offset,
+ end - log->last_checkpoint, GFP_NOIO, 0);
+ } else {
+ blkdev_issue_discard(bdev,
+ log->last_checkpoint + log->rdev->data_offset,
+ log->device_size - log->last_checkpoint,
+ GFP_NOIO, 0);
+ blkdev_issue_discard(bdev, log->rdev->data_offset, end,
+ GFP_NOIO, 0);
+ }
+}
+
+
static void r5l_do_reclaim(struct r5l_log *log)
{
struct r5l_io_unit *io, *last;
@@ -694,7 +722,7 @@ static void r5l_do_reclaim(struct r5l_log *log)
* here, because the log area might be reused soon and we don't want to
* confuse recovery
* */
- r5l_write_super(log, last->log_start);
+ r5l_write_super_and_discard_space(log, last->log_start);
mutex_lock(&log->io_mutex);
log->last_checkpoint = last->log_start;
--
1.8.1
--
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