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On Mon Aug 04 2008 at 14:08:57 -0700, Adam Burkepile wrote:
> While working on my project, I think I ran into an error in a man page
> for a function, VOP_ISLOCKED. The man page describes it as:
> Test if the vnode vp is locked. A non-zero value is
> returned if
> the vnode is not locked, otherwise zero is returned.
> I believe from what I've been able to tell, it is the opposite. A zero
> is returned if the vnode is not locked and non-zero value is returned
> if it is locked (the value representing the appropriate locks).
You're correct, I fixed man page.
> This is the test that I did to find this out:
> printf("1bvp ISLOCKED = %d\n",VOP_ISLOCKED(bvp)); //should
> have been locked at this point
> VOP_UNLOCK(bvp, 0);
> printf("2bvp ISLOCKED = %d\n",VOP_ISLOCKED(bvp)); //should be
> unlocked at this point
> when I do dmesg I get the following results though
> 1bvp ISLOCKED = 2
> 2bvp ISLOCKED = 0
> So as you can see I'm getting the opposite results that I expected.
> This held up the progress of my project so if this is really wrong, as
> I suspect, I'd like to fix it so it doesn't confuse anyone else. Can
> someone confirm this or correct me if I am wrong somehow.
Unfortunately the manual pages especially for file systems are not always
completely accurate. I suggest reading the source instead of banging
ones head against the wall for lengthy periods.
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