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of the lower level vnode is incremented to greater than 1 when the upper level vnode's v_usecount is greater than one. This is necessary for the NFS clients, so that they will do a silly rename of the file instead of actually removing it when the file is still in use. It is "racy", since the v_usecount is incremented in many places in the kernel with minimal synchronization, but an extraneous silly rename is preferred to not doing a silly rename when it is required. The only other file systems that currently check the value of v_usecount in their VOP_REMOVE() functions are nwfs and smbfs. These file systems choose to fail a remove when the v_usecount is greater than 1 and I believe will function more correctly with this patch, as well. Tested by: to.my.trociny at gmail.com Submitted by: to.my.trociny at gmail.com (earlier version) Reviewed by: kib MFC after: 2 weeks
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