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[219.110.241.48]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2adfb5c100csm70706155ad.23.2026.02.27.14.35.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Feb 2026 14:35:26 -0800 (PST) Received: from jro by jrotkm2 id 1vw6Qf-0003VW-29 ; Sat, 28 Feb 2026 07:35:25 +0900 Subject: Re: v7.0-rc1, name_to_handle_at(..., AT_EMPTY_PATH) To: Al Viro Cc: linux-fsdevel@vger.kernel.org In-Reply-To: <20260227184804.GC3836593@ZenIV> References: <14544.1772189098@jrotkm2> <20260227152211.GB3836593@ZenIV> <26309.1772206864@jrotkm2> <20260227184804.GC3836593@ZenIV> From: hooanon05g@gmail.com Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <13484.1772231725.1@jrotkm2> Date: Sat, 28 Feb 2026 07:35:25 +0900 Message-ID: <13485.1772231725@jrotkm2> Al Viro: > The last point where LOOKUP_EMPTY (or AT_EMPTY_PATH) matters is (and had > always been) getname_flags(); pathname resolution proper doesn't care. Filesystems recieved LOOKUP_EMPTY before v7.0-rc1 and could use it to detect a case like this. fd = open("fileA"); unlink("fileA"); name_to_handle_at(fd, "", fh, &mnt_id, AT_EMPTY_PATH); The flag was used to support - unlinked but still alive inode - without its name and d_revalidate() should handle it still valid. Yes, the filesystem is out-of-tree. Now I understand that LOOKUP_EMPTY is not passed to filesystem intentionally. Thank you J. R. Okajima