-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Daniel Golle <[email protected]> wrote: > Hi Karl, > > On Thu, Jan 28, 2016 at 09:31:14AM -0000, Karl Palsson wrote: > > Given that OpenWrt doesn't have a daemon like udisks to > > mount/umount things automatically, I was trying to build it > > myself by something like "block info" in a crontab. > > Well, there is mountd which can be used to maintain autofs for > hot-plugable block devices. It will only mount things when they > are actually being accessed (rather than mounting them once > inserted/plugged-in) but at least unmounting on hot-removal > doesn't need any extra care... I don't know your excact usage > scenario, however, it guess that's already a better place to > start from than having a cron-job...
I'll have a play with mountd, it seemed to be very very old untouched code, so I wasn't really excited about even trying, but sure. Are you saying that mountd will automatically unmount the filesystem if the device goes away or what? The problem is that the device does _not_ go away on hotplug. (It doesn't get created on hotplug either) I have to explicitly run "block info" to get the system to notice that the card is inserted (and it creates the devices) and that also works for noticing that the card has been removed (and removing the devices) but it _doesn't_ work after the device has been mounted. Until I explicitly unmount (block umount or manual umount) block info doesn't detect that the card has been removed. I want to _somehow_ catch and cleanup up if the card has been removed. At present, I can keep writing to a card that doesn't exist and all I get is a steady stream of failures on the console. Having to unmount just to _test_ if the card is still there isn't very helpful. Timelines, maybe that helps: paste these two into websequencediagrams.com - ------------ title USB SD Card detect without mounting note over devs: no /dev/sda* SD->USB-reader: inserted note over devs: no /dev/sda* Bob->console: block info console->devs: ?? note over devs: /dev/sda* created dmesg log about size ~xGb end note Bob->console: block info console->Bob: no change SD->USB-reader: removed Bob->console: block info console->devs: ?? note over devs: /dev/sda* removed dmesg log about size changed to 0 end note - -------------- - ------ title USB SD Card detect WITH mounting note over mounts: no mounts note over devs: no /dev/sda* SD->USB-reader: inserted note over devs: no /dev/sda* Bob->console: block info console->devs: ?? note over devs: /dev/sda* created dmesg log about size ~xGb end note Bob->console: block detect Bob->console: edit and enable /etc/config/fstab Bob->console: block mount note over mounts: /mnt/sda1 working Bob->console: block info console->Bob: no change SD->USB-reader: removed Bob->console: block info console->Bob: no change!! no longer notices card gone! note over devs,mounts: /dev/sda* and mounts still EXIST end note - ------- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAEBAgAGBQJWqgr5AAoJEBmotQ/U1cr2/mYP/3t4OMlJXGboCMwcZHXPEPWy oqNQ9Qtjdu0YWeiB5Vgil22o1pQgLtUw7FgiJ/H5JN09CMoU31Y/omeg6rvyzJBU Uf1YxW21pXPNhTPgGhtbIvPeD8ZMx3BIXJYNQmnZtRI1XJG5123u+S3hwHTQ68Jf YTI18+DpoHEheEkCWPAuKKC24bkknV2c9zKD9wb7LucYuLkoOVlNvgons6Duganr KIoREXvYZXtUqN4gCL+zBPK+sXib7sj4NVTQ7y64KaXJDiB/0G4CowSRIXjGYKA1 VXZjZJmW6PRtCVhaAt0QGvqLxTqP+o8VTPH8PmeGR3PQbZ8Dk+T+/OuZswWanwMK F4VR/PDqc66XR6E4MdSXKISsyRL23Hzpp8sIR1G4kgbuvfncms71zB6mKLrYne0n ZzaArsL69Zcp/qhSUOV0auGk1h5b6nFQQ1kREfbToJJMUXuSqMLWxAzx7Y25TKh5 zm5Piqwq2klvLwgnFUKJwuHZYwLsjsq//TJh3HZLrcfjyOGJlk61AKrnfXNStP8T eyAKn/Hh2FN/Bx/COSQIqkkA2gnTYODNmd02BsKVLCcX+4tcj4EaqOFo1l/PVldm IqkLmSG/1EV06ccJSQM2FwBzCFPgZUE+ri3dsPwscQfvVCBeISV27Mq/auiot4hh yMWKqybPLjx5j0SOfF/A =xvdw -----END PGP SIGNATURE-----
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