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Theorem may-create

vfs_may_create#(INO, DENT, USER, DIRS, FILES, ASYNCED; INODE, ERR) {afs_iget#(INO, DIRS, FILES, ASYNCED; INODE, ERR); if ERR = ESUCCESS then if ¬ INODE.directory then ERR := ENOTDIR else if ¬ px(USER, INODE.meta) ∨ ¬ pw(USER, INODE.meta) then ERR := EACCESS else {afs_lookup#(INO, DIRS, FILES, ASYNCED; DENT, ERR); if ERR = ESUCCESS then ERR := EEXISTS else if ERR = ENOENT then ERR := ESUCCESS} }