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    lockd: handle test_lock deferrals · 5ea0d750
    Marc Eshel 提交于
    Rewrite nlmsvc_testlock() to use the new asynchronous interface: instead of
    immediately doing a posix_test_lock(), we first look for a matching block.
    If the subsequent test_lock returns anything other than -EINPROGRESS, we
    then remove the block we've found and return the results.
    
    If it returns -EINPROGRESS, then we defer the lock request.
    
    In the case where the block we find in the first step has B_QUEUED set,
    we bypass the vfs_test_lock entirely, instead using the block to decide how
    to respond:
    	with nlm_lck_denied if B_TIMED_OUT is set.
    	with nlm_granted if B_GOT_CALLBACK is set.
    	by dropping if neither B_TIMED_OUT nor B_GOT_CALLBACK is set
    Signed-off-by: NMarc Eshel <eshel@almaden.ibm.com>
    Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>
    5ea0d750
svc4proc.c 14.5 KB