Messages in this thread | | | Date | Tue, 22 Feb 2005 14:00:22 +0100 | From | Jan Blunck <> | Subject | Re: [RFC] pdirops: vfs patch |
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Quoting Alex Tomas <alex@clusterfs.com>:
> >>>>> Jan Blunck (JB) writes: > > >> 1) i_sem protects dcache too > > JB> Where? i_sem is the per-inode lock, and shouldn't be used else. > > read comments in fs/namei.c:read_lookup() >
i_sem does NOT protect the dcache. Also not in real_lookup(). The lock must be acquired for ->lookup() and because we might sleep on i_sem, we have to get it early and check for repopulation of the dcache.
> we've already done this for ext3. it works. > it speeds some loads up significantly. > especially on big directories. > and you can control this via mount option, > so almost zero cost for fs that doesn't support pdirops.
Ok.
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