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Remove dummy znode from zvol_state #4510

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wants to merge 3 commits into from
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Remove dummy znode from zvol_state #4510

wants to merge 3 commits into from

Commits on May 13, 2016

  1. Remove dummy znode from zvol_state 

    struct zvol_state contains a dummy znode, which is around 1KB on x64, only for
zfs_range_lock. But in reality, other than z_range_lock and z_range_avl,
zfs_range_lock only need znode on regular file, which means we add 1KB on a
structure and gain nothing.

In this patch, we remove the dummy znode for zvol_state. In order to do that,
we also need to refactor zfs_range_lock a bit. We move z_range_lock and
z_range_avl pair out of znode_t to form zfs_rlock_t. This new struct replaces
znode_t as the main handle inside the range lock functions. We also add
pointers to z_size, z_blksz, and z_max_blksz so range lock code doesn't depend
on znode_t.

Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
    Chunwei Chen committed May 13, 2016
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  2. Use zfs range locks in ztest

    @bprotopopov
    bprotopopov authored and Chunwei Chen committed May 13, 2016
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  3. Export zfs_rlock symbols for users like lustre 

    Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
    Chunwei Chen committed May 13, 2016
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