Hello!
On Jan 17, 2012, at 3:26 AM, Lai Siyao wrote:
Are you referring to ll_lookup_it_finish() that flag negative dentry
DCACHE_LUSTRE_INVALID and hash/unhash it immediately if client doesn't have
UDATE lock? Looks like such dentry is skipped during link path walk as
ll_dcompare checks
On Jan 12, 2012, at 3:52 AM, Lai Siyao wrote:
No, to add a dentry to hash client needs holding LOOKUP lock, but
lustre client unhash (see
ll_unhash_aliases()) doesn't really remove dentry from hash, but set
LUSTRE_DCACHE_INVALID flag. So in
the race you mentioned, another process may
On Jan 12, 2012, at 3:52 AM, Lai Siyao wrote:
No, to add a dentry to hash client needs holding LOOKUP lock, but lustre
client unhash (see
ll_unhash_aliases()) doesn't really remove dentry from hash, but set
LUSTRE_DCACHE_INVALID flag. So in
the race you mentioned, another process may
On Tue, Jan 17, 2012 at 5:13 PM, tao.p...@emc.com wrote:
On Jan 12, 2012, at 3:52 AM, Lai Siyao wrote:
No, to add a dentry to hash client needs holding LOOKUP lock, but
lustre client unhash (see
ll_unhash_aliases()) doesn't really remove dentry from hash, but set
LUSTRE_DCACHE_INVALID
Got it. Thanks.
Best,
Tao
From: Lai Siyao [mailto:laisi...@whamcloud.com]
Sent: Tuesday, January 17, 2012 5:44 PM
To: Peng, Tao
Cc: gr...@whamcloud.com; Lustre-discuss@lists.lustre.org
Subject: Re: [Lustre-discuss] question about dcache revalidate
On Tue, Jan 17, 2012 at 5:13 PM, tao.p
Oleg hi,
-Original Message-
From: Oleg Drokin [mailto:gr...@whamcloud.com]
Sent: Friday, January 13, 2012 12:04 AM
To: Lai Siyao
Cc: Peng, Tao; Lustre-discuss@lists.lustre.org
Subject: Re: [Lustre-discuss] question about dcache revalidate
Hello!
On Jan 12, 2012, at 3:52 AM
No, to add a dentry to hash client needs holding LOOKUP lock, but lustre
client unhash (see ll_unhash_aliases()) doesn't really remove dentry from
hash, but set LUSTRE_DCACHE_INVALID flag. So in the race you mentioned,
another process may add the dentry but later the lock is canceled soon, so
at
Hello!
On Jan 12, 2012, at 3:52 AM, Lai Siyao wrote:
No, to add a dentry to hash client needs holding LOOKUP lock, but lustre
client unhash (see ll_unhash_aliases()) doesn't really remove dentry from
hash, but set LUSTRE_DCACHE_INVALID flag. So in the race you mentioned,
another process
Hi,
I was reading dcache.c and following comments in ll_revalidate_it() seem
confusing. Does it mean llite can hash a positive dentry to dcache without
taking inode LOOKUP lock?
589 /*
590 * This part is here to combat evil-evil race in real_lookup on 2.6
591 *
