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authorChunwei Chen <[email protected]>2016-04-11 14:53:48 -0700
committerBrian Behlendorf <[email protected]>2016-05-17 10:29:02 -0700
commitd88895a069765bc3c6119ac1a3c8ea9edec7a370 (patch)
tree4124ee3bfcf5d5ecb3f7c5e84cc95824a063faf7 /lib/libzpool/Makefile.am
parent61a3d06f8414ae1eb8b278be8776a6b30b351549 (diff)
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. This allows non-ZPL consumers like Lustre to use the range locks with their equivalent znode_t structure. Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Boris Protopopov <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #4510
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