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Message-Id: <200607211849.k6LInCi8011368@laptop13.inf.utfsm.cl> Date: Fri, 21 Jul 2006 14:49:12 -0400 From: "Horst H. von Brand" <vonbrand@....utfsm.cl> To: "Joshua Hudson" <joshudson@...il.com> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: what is necessary for directory hard links Joshua Hudson <joshudson@...il.com> wrote: > This patch is the sum total of all that I had to change in the kernel > VFS layer to support hard links to directories Can't be done, as it creates the possibility of loops. The "only files can be hardlinked" idea makes garbage collection (== deleting of unreachable objects) simple: Just check the number of references. Detecting unconnected subgraphs uses a /lot/ of memory; and much worse, you have to stop (almost) all filesystem activity while doing it. Besides, the flow "root down through directories" gives a natural order in which to go locking stuff when needed; if there can be loops, the system could easily deadlock. -- Dr. Horst H. von Brand User #22616 counter.li.org Departamento de Informatica Fono: +56 32 654431 Universidad Tecnica Federico Santa Maria +56 32 654239 Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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