zfs: Avoid updating the L2ARC device header unnecessarily
From openzfs-master0ae184a6b
commit message: If we do not write any buffers to the cache device and the evict hand has not advanced do not update the cache device header. Cherry-picked from openzfs0ae184a6ba
Patch Author: George Amanakis <gamanakis@gmail.com> MFC after: 3 days Reviewed by: delphij Differential Revision: https://reviews.freebsd.org/D28682
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@ -9062,6 +9062,7 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz)
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l2arc_write_callback_t *cb = NULL;
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zio_t *pio, *wzio;
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uint64_t guid = spa_load_guid(spa);
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l2arc_dev_hdr_phys_t *l2dhdr = dev->l2ad_dev_hdr;
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ASSERT3P(dev->l2ad_vdev, !=, NULL);
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@ -9293,7 +9294,8 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz)
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* Although we did not write any buffers l2ad_evict may
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* have advanced.
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*/
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l2arc_dev_hdr_update(dev);
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if (dev->l2ad_evict != l2dhdr->dh_evict)
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l2arc_dev_hdr_update(dev);
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return (0);
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}
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