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R. Okajima" , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, aufs-users@lists.sourceforge.net Subject: Re: Why is the length of max mount option a page size?? Message-ID: <20180529011412.GE30522@ZenIV.linux.org.uk> References: <20180521173959.GA12779@supsup-VirtualBox> <5670.1527244930@jrobl> <20180529002456.GA30767@supsup-VirtualBox> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: 8BIT In-Reply-To: <20180529002456.GA30767@supsup-VirtualBox> User-Agent: Mutt/1.9.1 (2017-09-22) Sender: linux-fsdevel-owner@vger.kernel.org X-Mailing-List: linux-fsdevel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Tue, May 29, 2018 at 09:24:56AM +0900, Jungsub Shin wrote: > Mount command : mount -t aufs -o br=~/tca_agent/container_rw_dir/51509032=rw:~/tca_agent/image_layer_dir/5a259d94211e449fd466d997b5b0b149cb2997a732fd3a838c14295e0eb93f92=ro+wh:~/tca_agent/image_layer_dir/faca908333f884648b75738571879df977339ee7615c65410c98001a463bcd00=ro+wh:~/tca_agent/image_layer_dir/67b50813aedeb67fd06b434163fa64d07fbd16f714196daea1cd139a0171b080=ro+wh:~/tca_agent/image_layer_dir/28b6f7699be037b7f80dd03b22830712aa75b88ddfbba0910dd059b522fbff20=ro+wh:~/tca_agent/image_layer_dir/c47c7125efa9172d262c5b3645594010704f67cf44005da9f6d7ea5a5d2a05db=ro+wh:~/tca_agent/image_layer_dir/b91ed1b448ac52d251c785f5cfc299ca3ba4cfd68d739832b766228afa84a651=ro+wh:~/tca_agent/image_layer_dir/0169cd8bc0bdbecedb30c7d995e69e832d7ccd5c435e72c40af6940db87851b7=ro+wh:~/tca_agent/image_layer_dir/e7ef7d443e31f8b3b8a0a002a6895746d3737289eb2eea18d669924c089279f2=ro+wh:~/tca_agent/image_layer_dir/31bfb0cd724fda09280305b8dc1c4b0587ca01f5dd503d28afa82cff4fa92475=ro+wh:~/tca_agent/image_layer_dir/74428f0d76521fa9b9b1189cb72d303e367003c113cc8a11db125e3f7df1daa1=ro+wh:~/tca_agent/image_layer_dir/b20a927da14045cac0cd6a745f67fdeb88ead6d85752c670ea2773b27387f6ae=ro+wh:~/tca_agent/image_layer_dir/7dee3bce119631e3c922d78860d6b0ae160e237b63bf19f43713a05d1086c72f=ro+wh:~/tca_agent/image_layer_dir/636bce8f18e8734cb98f170bdcf1fb9ae52f1b091bfadcb2bef378b0d829ceb6=ro+wh:~/tca_agent/image_layer_dir/9c6fde234e701cf7b61534ef3a23cc4e0cdb6d3ffc497feaa8fcddc52e8d1fda=ro+wh:~/tca_agent/image_layer_dir/83c2f1968a932e3e284ef20b10a4ef8a9cfc01589dacf2100fb9a78e88c3888e=ro+wh:~/tca_agent/image_layer_dir/ec096a351601040fcd37c31edccd2f68106438097e8adf7253539366b2232de5=ro+wh:~/tca_agent/image_layer_dir/6de889accecb819028355196bde150749598e982b5dfe556540e102c737bfc34=ro+wh:~/tca_agent/image_layer_dir/1042cb8f2263d1030fdb57e0ca671b34a2180bb35d9448737e4a03e4987cf942=ro+wh:~/tca_agent/image_layer_dir/4fab8c997a447af2375e325467661ca1d74bf62dc6d802426f20d0134c9c43bc=ro+wh:~/tca_agent/image_layer_dir/ca57efb1c28464fab46af1826243c02af0a0b6cfb90bf92b30110e79028c5e68=ro+wh:~/tca_agent/image_layer 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1f549d620d723ea293f001e3d30795108b=ro+wh:~/tca_agent/image_layer_dir/a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4=ro+wh:~/tca_agent/image_layer_dir/e5ad7970bc69d2ba62d2bbb4b80627273350e1982ff43bc1ca04a3215bc6da5b=ro+wh none ~/tca_agent/container_root_dir/51509032 > dmesg : [343090.744067] aufs opt_add:810:mount[30864]: lookup failed /root/tca_agent/image_layer_di (-2) > ------------------------------------------------------------------------ > > br option is cut and aufs search cut directory. Length of mount option > is about 6400. The lack of planning on your part... IOW, don't do it. Use of symlinks (or bindings) might alleviate the problem if aufs interface is that nasty. And before you go "just read up to \0", consider e.g. NFS flavours with binary data structure passed instead of a string.