Date: Sun, 28 Jul 2013 16:47:01 +0200 From: cpghost <cpghost@cordula.ws> To: David.I.Noel@gmail.com Cc: freebsd-questions@freebsd.org Subject: Re: Delete a directory, crash the system Message-ID: <51F52EE5.2020604@cordula.ws> In-Reply-To: <51F41BAF.8070506@cordula.ws> References: <CAHAXwYDPMrdY-TP-5T1_6M_ot4gY09jo2_Wi_REOmE=%2Bu%2B_QuQ@mail.gmail.com> <CAGwOe2byRc4LVsyxvTJgxNGCbhvOEaeDXjmFJ7DoXThPQe1bcQ@mail.gmail.com> <CAHAXwYCj9AV8ZcDffNNGx-ivL=h_TK9zLQRTPknArX25HSfEag@mail.gmail.com> <CAGwOe2YCDRqHudovDB_Kz9WHppvB8v2L%2B0gkDnWgG88bgZTKSA@mail.gmail.com> <CAHAXwYCnRDQqgRcvaEE1BmSJYYOidoQzzUoHX_QWdyJzYO3kKw@mail.gmail.com> <51F3F290.9020004@cordula.ws> <CAHAXwYA7WfYP8OZBVf47xRsDp9N01U3rPLZwwj7PFqkPxm3oag@mail.gmail.com> <51F41BAF.8070506@cordula.ws>
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On 07/27/13 21:12, cpghost wrote: > A more robust file system would halt all processes, and perform > an in-kernel fsck on the filesystem and its internal (in-memory) > structures to repair the damage... and THEN resume the processes. > > However, this is a major project, and we don't have a self-healing > filesystem / kernel (... yet). ;-) > > -cpghost. If we think this further, we may as well start introducing some elements of self-healing or at least self-inspecting in the kernel. How about, for example, a kernel thread that wakes up periodically, walks through VFS structures, and checks their integrity? Perhaps also verifying the underlying inodes as well? Think background fsck, but within the kernel and for kernel structures themselves. Others parts of the kernel could as well self-inspect for consistency with a periodic kernel thread. Some parts are easier than others, so I don't think we could also walk the VM structures (if those are corrupt, even the repair-thread will be running amok). But save for that, most parts of the kernel could use some periodic consistency checking. Make that checking optional via a sysctl(8), and it won't even cost performance. -cpghost. -- Cordula's Web. http://www.cordula.ws/
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