From: Al Viro <viro@ZenIV.linux.org.uk>
To: Jungsub Shin <supsup5642@gmail.com>
Cc: "J. R. Okajima" <hooanon05g@gmail.com>,
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??
Date: Tue, 29 May 2018 02:14:12 +0100 [thread overview]
Message-ID: <20180529011412.GE30522@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20180529002456.GA30767@supsup-VirtualBox>
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_dir/ad86d54176611b5117fc155e8dfbd0b59bc0abce4e2051baef12c2f1e152c92f=ro+wh:~/tca_agent/image_layer_dir/f323ae7b264dcc517876e7c722ac3369baaef1a7c18cc5aae5f43f440fd646c0=ro+wh:~/tca_agent/image_layer_dir/a7d1c89c8422563102bd353de46154191038f92c9ebde8b22a8b2749140029ec=ro+wh:~/tca_agent/image_layer_dir/104adb8634902678f87db6bdbdb12d43d5bd6db9909ae9b12e078286046a1298=ro+wh:~/tca_agent/image_layer_dir/00450b5308ac99846ae7e5fa47652952c4fbbe82882ac241d5153d630644f790=ro+wh:~/tca_agent/image_layer_dir/129675caf5fdc1616c619d5b5718417806a64f282d324a3a580d6df1269b4f3f=ro+wh:~/tca_agent/image_layer_dir/8ce8b37ab4829a1fd34fcd38842b912d46eb3f7511365ccec0399a06670ab2fc=ro+wh:~/tca_agent/image_layer_dir/57080e2e0baad381605079107f08435133d7829364a9c450fc08877f01e57601=ro+wh:~/tca_agent/image_layer_dir/9ca225075a8c2bfd27ef5084e41335d781d24e7be0cbf4575ec3d42de662c6ac=ro+wh:~/tca_agent/image_layer_dir/74ec3835691908f9e6e271797f373257de3f9cc4bb408fd66dd229537ea5fcc1=ro+wh:~/tca_agent/image_layer_dir/59aa8f04c38abaae9c0e430d7b1a91f6560641e429386ee2c4eec57f0af35c04=ro+wh:~/tca_agent/image_layer_dir/bc318ac48b4f7a9536b72e2b0f223726a5225e13ecc70eba4b7b00e2bf80081b=ro+wh:~/tca_agent/image_layer_dir/bbfb0e8818be82ca0f17f280f7ad89497fef6c92e2bb50c40b2bd17c79347425=ro+wh:~/tca_agent/image_layer_dir/f36b94436263ce21d885d2f3f94c7b307e966a989fcefd3027c039e987d7dc2b=ro+wh:~/tca_agent/image_layer_dir/9103dae307f5748103f89093273329a523300b4f103a1d397c44abd766fe0015=ro+wh:~/tca_agent/image_layer_dir/9bd48cc89c1fc083b0db7ed45e5d7e4fec277450b8b47f96884588930ce8c56f=ro+wh:~/tca_agent/image_layer_dir/47ba0411cc8344ab1895a6b8eb0878a9ffd34410170a140ad1f210f20eedcdce=ro+wh:~/tca_agent/image_layer_dir/42b317de582399eb395b2818b4d658fb0a5987e8df1163e49ac2d8bec95a078e=ro+wh:~/tca_agent/image_layer_dir/57bb07a87ab6c29b048638c65566febe800fe79672730f7bb9e70b8f2e677e5a=ro+wh:~/tca_agent/image_layer_dir/b89b49aa036df19c6a2e77cc4aaef707ab3fd916d2d936b9e5e160d448d96ab3=ro+wh:~/tca_agent/image_layer_dir/d7bf931f8235cc7cc68c223b2945f77e858eb8cff4c9cb8bd64bacfd29312672=ro+wh:~/tca_agent/image_layer_dir/49a8b40dbec97066dbad4fb14d1bf388102190442679527e112b030270426ccc=ro+wh:~/tca_agent/image_layer_dir/05f05d402ea8ee67da1af2c9e35d10b9619b0f0c14a56788a1a0b5eeb290d685=ro+wh:~/tca_agent/image_layer_dir/b05d3f32ac4ff52a542dfcf50dbf155d060d79bd23d0ebed1439a3c6b1120731=ro+wh:~/tca_agent/image_layer_dir/0d061258f32c904c95aa020a9f679790c5722c3017eef98e298d6e29b4f02089=ro+wh:~/tca_agent/image_layer_dir/1f9c07049bcd59c59413c1706d0402b04c96598174eb16ef3de25b4e47413ad2=ro+wh:~/tca_agent/image_layer_dir/a86578a8bff61017b80eb653705c3f41136efb9b88facd6a2c67e8b3426e47f9=ro+wh:~/tca_agent/image_layer_dir/c3fdf4a694f0cc03939ee2cfdd09fb623966c5bb193778eaaea317655773656e=ro+wh:~/tca_agent/image_layer_dir/1b8fcd446a37050b55f57687aaae1150d74cc7f4468bbd00942535bad5ab22fe=ro+wh:~/tca_agent/image_layer_dir/6624cfa732b528cf7c1996719e30d1525aa27af7584f61a149d4d386aa8cf301=ro+wh:~/tca_agent/image_layer_dir/5b57e87f9b5859d902c4338c7a7ce5996a51fb8226a8f11ab29e10af4af5f14f=ro+wh:~/tca_agent/image_layer_dir/0c65112ac5c572a950e2671f903ef11e918e6e3cdbf026edda90db6c7a9c6ef8=ro+wh:~/tca_agent/image_layer_dir/ce16b72d243b82ded684a547da1400b8f2d07ed7b36b114ae0cbe2f20c17b0bf=ro+wh:~/tca_agent/image_layer_dir/a3937b112d7dbedfe075162862e404b7b85803d880589eaf3ebad9855629bdd5=ro+wh:~/tca_agent/image_layer_dir/b486d646cd9f5b8151856133ea3e81d53c3664bb727a0a87d0197cbbae9211de=ro+wh:~/tca_agent/image_layer_dir/de1b712fcfedbc3f61248c1a5fb9cba5a5ab6c7415f2c71c7ea162fd7c738c6f=ro+wh:~/tca_agent/image_layer_dir/2958a858559d3091b8162c066cfe5e17012f2307772180e702ffbc89bcae8fc2=ro+wh:~/tca_agent/image_layer_dir/14eae848ef41eb275ad37cc9d12dc276d3f08beeb06e041407371b9489335ee1=ro+wh:~/tca_agent/image_layer_dir/d72e07c403501a4abefaa80f3b81121392c42f314fc14bbf1bb434dc84457dd5=ro+wh:~/tca_agent/image_layer_dir/ee0efde24e35b4e2f801ca25640169ca2f319f9b5d37dbb0917cfd43e818d1f4=ro+wh:~/tca_agent/image_layer_dir/67dfb4d7c7ce39829d36740e1ef5279e00320a0d2bfe06bb67b6571f1ff47627=ro+wh:~/tca_agent/image_layer_dir/b3a1a69310f719755232ed5f8509f11f549d620d723ea293f001e3d30795108b=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.
WARNING: multiple messages have this Message-ID (diff)
From: Al Viro <viro@ZenIV.linux.org.uk>
To: Jungsub Shin <supsup5642@gmail.com>
Cc: "J. R. Okajima" <hooanon05g@gmail.com>,
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??
Date: Tue, 29 May 2018 02:14:12 +0100 [thread overview]
Message-ID: <20180529011412.GE30522@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20180529002456.GA30767@supsup-VirtualBox>
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
_dir/ad86d54176611b5117fc155e8dfbd0b59bc0abce4e2051baef12c2f1e152c92f=ro+wh:~/tca_agent/image_layer_dir/f323ae7b264dcc517876e7c722ac3369baaef1a7c18cc5aae5f43f440fd646c0=ro+wh:~/tca_agent/image_layer_dir/a7d1c89c8422563102bd353de46154191038f92c9ebde8b22a8b2749140029ec=ro+wh:~/tca_agent/image_layer_dir/104adb8634902678f87db6bdbdb12d43d5bd6db9909ae9b12e078286046a1298=ro+wh:~/tca_agent/image_layer_dir/00450b5308ac99846ae7e5fa47652952c4fbbe82882ac241d5153d630644f790=ro+wh:~/tca_agent/image_layer_dir/129675caf5fdc1616c619d5b5718417806a64f282d324a3a580d6df1269b4f3f=ro+wh:~/tca_agent/image_layer_dir/8ce8b37ab4829a1fd34fcd38842b912d46eb3f7511365ccec0399a06670ab2fc=ro+wh:~/tca_agent/image_layer_dir/57080e2e0baad381605079107f08435133d7829364a9c450fc08877f01e57601=ro+wh:~/tca_agent/image_layer_dir/9ca225075a8c2bfd27ef5084e41335d781d24e7be0cbf4575ec3d42de662c6ac=ro+wh:~/tca_agent/image_layer_dir/74ec3835691908f9e6e271797f373257de3f9cc4bb408fd66dd229537ea5fcc1=ro+wh:~/tca_agent/image_layer_dir/59aa8f04c38abaae9c0e430d7b1a91f6560641e429386ee2c4eec57f0af35c04=ro+wh:~/tca_agent/image_layer_dir/bc318ac48b4f7a9536b72e2b0f223726a5225e13ecc70eba4b7b00e2bf80081b=ro+wh:~/tca_agent/image_layer_dir/bbfb0e8818be82ca0f17f280f7ad89497fef6c92e2bb50c40b2bd17c79347425=ro+wh:~/tca_agent/image_layer_dir/f36b94436263ce21d885d2f3f94c7b307e966a989fcefd3027c039e987d7dc2b=ro+wh:~/tca_agent/image_layer_dir/9103dae307f5748103f89093273329a523300b4f103a1d397c44abd766fe0015=ro+wh:~/tca_agent/image_layer_dir/9bd48cc89c1fc083b0db7ed45e5d7e4fec277450b8b47f96884588930ce8c56f=ro+wh:~/tca_agent/image_layer_dir/47ba0411cc8344ab1895a6b8eb0878a9ffd34410170a140ad1f210f20eedcdce=ro+wh:~/tca_agent/image_layer_dir/42b317de582399eb395b2818b4d658fb0a5987e8df1163e49ac2d8bec95a078e=ro+wh:~/tca_agent/image_layer_dir/57bb07a87ab6c29b048638c65566febe800fe79672730f7bb9e70b8f2e677e5a=ro+wh:~/tca_agent/image_layer_dir/b89b49aa036df19c6a2e77cc4aaef707ab3fd916d2d936b9e5e160d448d96ab3=ro+wh:~/tca_agent/image_layer_dir/d7bf931f8235cc7cc68c223b2945f77e858eb8cff4c9cb8bd64bacfd293126
72=ro+wh:~/tca_agent/image_layer_dir/49a8b40dbec97066dbad4fb14d1bf388102190442679527e112b030270426ccc=ro+wh:~/tca_agent/image_layer_dir/05f05d402ea8ee67da1af2c9e35d10b9619b0f0c14a56788a1a0b5eeb290d685=ro+wh:~/tca_agent/image_layer_dir/b05d3f32ac4ff52a542dfcf50dbf155d060d79bd23d0ebed1439a3c6b1120731=ro+wh:~/tca_agent/image_layer_dir/0d061258f32c904c95aa020a9f679790c5722c3017eef98e298d6e29b4f02089=ro+wh:~/tca_agent/image_layer_dir/1f9c07049bcd59c59413c1706d0402b04c96598174eb16ef3de25b4e47413ad2=ro+wh:~/tca_agent/image_layer_dir/a86578a8bff61017b80eb653705c3f41136efb9b88facd6a2c67e8b3426e47f9=ro+wh:~/tca_agent/image_layer_dir/c3fdf4a694f0cc03939ee2cfdd09fb623966c5bb193778eaaea317655773656e=ro+wh:~/tca_agent/image_layer_dir/1b8fcd446a37050b55f57687aaae1150d74cc7f4468bbd00942535bad5ab22fe=ro+wh:~/tca_agent/image_layer_dir/6624cfa732b528cf7c1996719e30d1525aa27af7584f61a149d4d386aa8cf301=ro+wh:~/tca_agent/image_layer_dir/5b57e87f9b5859d902c4338c7a7ce5996a51fb8226a8f11ab29e10af4af5f14f=ro+wh:~/tca_agent/image_layer_dir/0c65112ac5c572a950e2671f903ef11e918e6e3cdbf026edda90db6c7a9c6ef8=ro+wh:~/tca_agent/image_layer_dir/ce16b72d243b82ded684a547da1400b8f2d07ed7b36b114ae0cbe2f20c17b0bf=ro+wh:~/tca_agent/image_layer_dir/a3937b112d7dbedfe075162862e404b7b85803d880589eaf3ebad9855629bdd5=ro+wh:~/tca_agent/image_layer_dir/b486d646cd9f5b8151856133ea3e81d53c3664bb727a0a87d0197cbbae9211de=ro+wh:~/tca_agent/image_layer_dir/de1b712fcfedbc3f61248c1a5fb9cba5a5ab6c7415f2c71c7ea162fd7c738c6f=ro+wh:~/tca_agent/image_layer_dir/2958a858559d3091b8162c066cfe5e17012f2307772180e702ffbc89bcae8fc2=ro+wh:~/tca_agent/image_layer_dir/14eae848ef41eb275ad37cc9d12dc276d3f08beeb06e041407371b9489335ee1=ro+wh:~/tca_agent/image_layer_dir/d72e07c403501a4abefaa80f3b81121392c42f314fc14bbf1bb434dc84457dd5=ro+wh:~/tca_agent/image_layer_dir/ee0efde24e35b4e2f801ca25640169ca2f319f9b5d37dbb0917cfd43e818d1f4=ro+wh:~/tca_agent/image_layer_dir/67dfb4d7c7ce39829d36740e1ef5279e00320a0d2bfe06bb67b6571f1ff47627=ro+wh:~/tca_agent/image_layer_dir/b3a1a69310f719755232ed5f8509f1
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.
next prev parent reply other threads:[~2018-05-29 1:14 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-21 17:39 Why is the length of max mount option a page size?? Jungsub Shin
2018-05-25 10:42 ` J. R. Okajima
2018-05-29 0:24 ` Jungsub Shin
2018-05-29 1:14 ` Al Viro [this message]
2018-05-29 1:14 ` Al Viro
2018-05-29 3:57 ` Jungsub Shin
2018-05-30 2:40 ` J. R. Okajima
2018-05-30 23:51 ` Jungsub Shin
2018-05-29 1:14 ` J. R. Okajima
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180529011412.GE30522@ZenIV.linux.org.uk \
--to=viro@zeniv.linux.org.uk \
--cc=aufs-users@lists.sourceforge.net \
--cc=hooanon05g@gmail.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=supsup5642@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.