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for maintaining persisitency From: James Bottomley To: Al Viro , linux-fsdevel@vger.kernel.org Cc: torvalds@linux-foundation.org, brauner@kernel.org, jack@suse.cz, raven@themaw.net, miklos@szeredi.hu, neil@brown.name, a.hindborg@kernel.org, linux-mm@kvack.org, linux-efi@vger.kernel.org, ocfs2-devel@lists.linux.dev, kees@kernel.org, rostedt@goodmis.org, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, paul@paul-moore.com, casey@schaufler-ca.com, linuxppc-dev@lists.ozlabs.org, john.johansen@canonical.com, selinux@vger.kernel.org, borntraeger@linux.ibm.com, bpf@vger.kernel.org Date: Tue, 28 Oct 2025 08:38:00 -0400 In-Reply-To: <20251028004614.393374-7-viro@zeniv.linux.org.uk> References: <20251028004614.393374-1-viro@zeniv.linux.org.uk> <20251028004614.393374-7-viro@zeniv.linux.org.uk> Autocrypt: addr=James.Bottomley@HansenPartnership.com; prefer-encrypt=mutual; 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 GK1ueesu q0zs5KpmRtQN7GFLbTvCxmo97tEP76/YZAa9dykcacmV6ziTC0dGZT2Zuu6miVZ2kE/WSjF0KQhU7NYr5RgJCuMw3lU/OLdkFL1FATRN45PMGahirYS6032sBF/TursnynRrhMWQ8gHwJrJ4ifnAxH6nvMrX2DHj2tP8dQ7Q2UQ63pqCr4Qrrp9umpwytHPUK07sCqFXka04o51eHso9rtfjFs910gxDAYFplAnjl6T6Wtj3Gx0ER4R2y62Y0wXJRhETcXLGV9RH1a8mY0HWgDdYjUCCye0Y38nesGc0tZ+2EfTKPGYyw1GpNaQQfjUAad0Ge5fjWHcgrhu97W7LmtJbIhQJKEb1yCjaK5iEw8n9Tjw+49DT+r2yiMmglKGdSjbSE X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 2025-10-28 at 00:45 +0000, Al Viro wrote: [...] > +void d_make_discardable(struct dentry *dentry) > +{ > + spin_lock(&dentry->d_lock); > + dentry->d_flags &=3D ~DCACHE_PERSISTENT; > + dentry->d_lockref.count--; > + rcu_read_lock(); > + finish_dput(dentry); > +} > +EXPORT_SYMBOL(d_make_discardable); I was going to ask why you don't have a WARN_ON if the dentry is not persistent here. Fortunately I read the next patch which gives the explanation and saw that you do do this in patch 50. For those of us who have a very linear way of reading and responding to patches, it would have been helpful to put a comment at the top saying something like persistency will be checked when all callers are converted, which you can replace in patch 50. Regards, James