Messages in this thread |  | | Date | Thu, 26 Apr 2001 22:14:45 +0200 | From | Andrea Arcangeli <> | Subject | Re: [PATCH] SMP race in ext2 - metadata corruption. |
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On Thu, Apr 26, 2001 at 10:11:09PM +0200, Andrea Arcangeli wrote: > On Thu, Apr 26, 2001 at 03:55:19PM -0400, Alexander Viro wrote: > > > > > > On Thu, 26 Apr 2001, Andrea Arcangeli wrote: > > > > > On Thu, Apr 26, 2001 at 03:34:00PM -0400, Alexander Viro wrote: > > > > Same scenario, but with read-in-progress started before we do getblk(). BTW, > > > > > > how can the read in progress see a branch that we didn't spliced yet? We > > > > fd = open("/dev/hda1", O_RDONLY); > > read(fd, buf, sizeof(buf)); > > You misunderstood the context of what I said, I perfectly know the race > you are talking about, I was answering Linus's question "the > wait_on_buffer isn't even necessary to protect ext2 against ext2". You > are talking about the other race that is "ext2" against "block_dev", and > I obviously agree on that one since the first place as I immediatly > answered you "correct". > > What I'm saying above is that even without the wait_on_buffer ext2 can ^^^ "cannot" of course > screwup itself because the splice happens after the buffer are just all > uptodate so any "reader" (I mean any reader through ext2 not through > block_dev) will never try to do a bread on that blocks before they're > just zeroed and uptodate. > > Andrea
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