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Linux 4.7 compat: inode_lock() and friends
Linux 4.7 changes i_mutex to i_rwsem, and we should used inode_lock and inode_lock_shared to do exclusive and shared lock respectively. We use spl_inode_lock{,_shared}() to hide the difference. Note that on older kernel you'll always take an exclusive lock. We also add all other inode_lock friends. And nested users now should explicitly call spl_inode_lock_nested with correct subclass. Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue openzfs/zfs#4665 Closes openzfs#549
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