Messages in this thread | | | Date | Tue, 22 Feb 2005 14:41:58 +0100 | From | Jan Blunck <> | Subject | Re: [RFC] pdirops: vfs patch |
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Quoting Alex Tomas <alex@clusterfs.com>:
> >>>>> Jan Blunck (JB) writes: > > JB> i_sem does NOT protect the dcache. Also not in real_lookup(). The lock > must be > JB> acquired for ->lookup() and because we might sleep on i_sem, we have to > get it > JB> early and check for repopulation of the dcache. > > dentry is part of dcache, right? i_sem protects dentry from being > returned with incomplete data inside, right? >
Nope, d_alloc() is setting d_flags to DCACHE_UNHASHED. Therefore it is not found by __d_lookup() until it is rehashed which is implicit done by ->lookup().
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