Messages in this thread | | | Date | Sat, 13 Apr 2002 08:39:52 +0200 | From | Andi Kleen <> | Subject | Re: [PATCH] zerocopy NFS updated |
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> I wonder if it is reasonable to depend on that: -- i.e. I'll only ever > see zeros, not say random bytes, or ones or something. I'm sure that's > so with the current kernel, and probably all of them ever (except for > bugs) but I wonder whether it's ok to rely on that.
With truncates you should only ever see zeros. If you want this guarantee over system crashes you need to make sure to use the right file system though (e.g. ext2 or reiserfs without the ordered data mode patches or ext3 in writeback mode could give you junk if the system crashes at the wrong time). Still depending on only seeing zeroes would seem to be a bit fragile on me (what happens when the disk dies for example?), using some other locking protocol is probably more safe.
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