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dm writecache: optimize superblock write
If we write a superblock in writecache_flush, we don't need to set bit and scan the bitmap for it - we can just write the superblock directly. Also, we can set the flag REQ_FUA on the write bio, so that we don't need to submit a flush bio afterwards. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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@ -509,6 +509,34 @@ static void ssd_commit_flushed(struct dm_writecache *wc, bool wait_for_ios)
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memset(wc->dirty_bitmap, 0, wc->dirty_bitmap_size);
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}
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static void ssd_commit_superblock(struct dm_writecache *wc)
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{
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int r;
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struct dm_io_region region;
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struct dm_io_request req;
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region.bdev = wc->ssd_dev->bdev;
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region.sector = 0;
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region.count = PAGE_SIZE;
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if (unlikely(region.sector + region.count > wc->metadata_sectors))
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region.count = wc->metadata_sectors - region.sector;
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region.sector += wc->start_sector;
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req.bi_op = REQ_OP_WRITE;
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req.bi_op_flags = REQ_SYNC | REQ_FUA;
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req.mem.type = DM_IO_VMA;
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req.mem.ptr.vma = (char *)wc->memory_map;
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req.client = wc->dm_io;
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req.notify.fn = NULL;
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req.notify.context = NULL;
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r = dm_io(&req, 1, ®ion, NULL);
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if (unlikely(r))
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writecache_error(wc, r, "error writing superblock");
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}
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static void writecache_commit_flushed(struct dm_writecache *wc, bool wait_for_ios)
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{
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if (WC_MODE_PMEM(wc))
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@ -759,8 +787,10 @@ static void writecache_flush(struct dm_writecache *wc)
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wc->seq_count++;
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pmem_assign(sb(wc)->seq_count, cpu_to_le64(wc->seq_count));
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writecache_flush_region(wc, &sb(wc)->seq_count, sizeof sb(wc)->seq_count);
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writecache_commit_flushed(wc, false);
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if (WC_MODE_PMEM(wc))
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writecache_commit_flushed(wc, false);
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else
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ssd_commit_superblock(wc);
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wc->overwrote_committed = false;
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