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On Mon, May 03, 2004 at 01:48:59PM +0200, Erik Mouw wrote: > On Mon, May 03, 2004 at 01:43:16PM +0200, Libor Vanek wrote: > > > (BTW, if you need to copy files from kernel, it's usually a sign of bad > > > design) > > It's not bad design - what I'm doing is writing snapshots for VFS as > > my diploma thesis. And I need to create copy of file before it's > > changed (copy-on-write). There is no other way how to do it in > > kernel-space (and user-space solutions like using LUFS are really > > slow) > Have a look at the cowlinks (copy-on-write links) thread from last > month, it might do the trick. Hmmm, that seems to have several serious disadvantages: - it's not filesystem/user-space SW independent (requires modifying them - as far as I understand how it's done) - needs to "touch" all existing files/dirs (maybe I'm wrong but from very first look it seems to me that I need to setup "cow" flag on each file/dir I want to "cow") - my approach should be "atomic" even when I need to setup snapshot on directory containing 100s thousands of files/dirs (and that's an average server I'm thinking of!) Nevertheless - thanks for a tip. Libor - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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