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authorSteven Whitehouse <swhiteho@redhat.com>2006-09-11 21:40:30 -0400
committerSteven Whitehouse <swhiteho@redhat.com>2006-09-11 21:40:30 -0400
commit24264434603cc102d71fb2a1b3b7e282a781f449 (patch)
tree18af5274fa222f0420df30651f57bab1eaf75eab /fs/gfs2/main.c
parent94610610f10749c0e17b4d2840ff8a7cb636c413 (diff)
[GFS2] Rewrite of examine_bucket()
The existing implementation of this function in glock.c was not very efficient as it relied upon keeping a cursor element upon the hash chain in question and moving it along. This new version improves upon this by using the current element as a cursor. This is possible since we only look at the "next" element in the list after we've taken the read_lock() subsequent to calling the examiner function. Obviously we have to eventually drop the ref count that we are then left with and we cannot do that while holding the read_lock, so we do that next time we drop the lock. That means either just before we examine another glock, or when the loop has terminated. The new implementation has several advantages: it uses only a read_lock() rather than a write_lock(), so it can run simnultaneously with other code, it doesn't need a "plug" element, so that it removes a test not only from this list iterator, but from all the other glock list iterators too. So it makes things faster and smaller. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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