23c5f56e329e9900155a740b947eaaabc30de1f4
This patch uses stricter locking for REQ_LINK, REQ_MKDIR, REQ_MKNOD, REQ_RENAME, REQ_RMDIR, REQ_SLINK and REQ_UNLINK. For all requests, VFS locks the directory in which we add or remove an inode with VNODE_WRITE. I.e., the operations have exclusive access to that directory. Furthermore, REQ_CHOWN, REQ_CHMOD, and REQ_FTRUNC now lock the vmnt VMNT_READ; VMNT_WRITE was unnecessary.
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