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| 18:00.49 | slashbeast | landley: question about mdev. I have a device, say sdb, it does not populate partition table. until I click in my phone to enable usb storage. |
| 18:00.58 | slashbeast | landley: can I poke mdev to create the partiton nodes then? |
| 18:01.09 | slashbeast | landley: mdev -s is needed or blockdev --rereadpt. |
| 18:01.14 | slashbeast | landley: udev can handle it automaticly. |
| 18:14.57 | landley | When you say "mdev -s is needed", running mdev -s makes it populate? |
| 18:15.22 | landley | slashbeast: presumably some interaction with the device is necessary to get it to probe its partition. (I think opening the /dev node, if I recall right?) |
| 18:15.32 | landley | I hit this with nbd-client... |
| 18:16.45 | landley | In theory "touch /dev/sdb" should do it if that's doing an open() under the covers. You could add that to the mdev.conf as an action to take when the device shows up? |
| 18:16.54 | landley | Use the no-create flag to avoid race conditions with device deletion. |
| 18:17.06 | landley | I suppose mdev should really do this itself for block devices. :) |
| 18:17.21 | landley | (I'll make a note to have mine do that...) |
| 18:19.34 | slashbeast | landley: when device showup I have not enabled usb storage, when i plug my phone and after some minutes hit usb storage button, it suppose to scan for pt there, hm. |
| 18:20.23 | slashbeast | landley: yeah, touch did the trick. |
| 18:20.52 | slashbeast | but touching in a loop? Is not a solution. ;-) |
| 18:21.32 | ohsix | it's more unixy |
| 18:24.22 | slashbeast | also after removing usbstorage, I need to touch it again to delete sdb1 |
| 18:24.45 | slashbeast | landley: you think mdadm should periodically touch main block devices? |
| 18:24.52 | slashbeast | by main I mean sda, sdb, not sda1 sda2. |
| 18:37.38 | landley | No, it should only be needed when the device first shows up. |
| 18:37.51 | landley | fdisk should trigger a rescan itself when/if you repartition. |
| 18:38.03 | landley | (There's actually an ioctl for it, I believe.) |
| 18:38.38 | landley | adding/removing... you mean the module? |
| 18:38.42 | landley | Or plugging/unplugging usb? |
| 18:38.53 | landley | Why would there be an sdb usb device if nothing was plugged in? |
| 18:39.06 | landley | mdev should have a hotplug mode. |
| 18:39.30 | landley | echo /sbin/mdev > /proc/sys/kernel/hotplug |
| 18:41.24 | slashbeast | landley: I connect my phone, sdb is created. then I select in phone enable USB storage - then sdb1 suppose to be created, not before |
| 18:41.45 | slashbeast | landley: I think some Multicard USB readers create sdb, sdc, sdd and sde then when you plug a card it create a sdb1 sdc1 etc. |
| 18:42.05 | slashbeast | atm I need to touch main device to make /dev/sdb1 be created after I enable usb storage |
| 18:44.52 | ohsix | so you have a phone that is basically a card reader with removable media, it just happens to show up when you pick a mass storage mode |
| 18:48.13 | slashbeast | every android phone acting like that |
| 18:48.27 | ohsix | mine doesn't do that |
| 18:48.48 | ohsix | it's charge, sync, or usb mass storage, and it doesn't show the card as a removable volume |
| 18:49.04 | slashbeast | yh, propably I explainet it wrong |
| 18:49.11 | slashbeast | when you select charge, can you re-select usb mass storage? |
| 18:49.28 | slashbeast | and if you charge, do sdb is created? |
| 18:49.44 | ohsix | yea, but i never get a drive with a removable volume, it's either mass storage or nothing |
| 18:50.01 | ohsix | no, if it's just charging there's nothing for usb-storage to even bind to |
| 18:50.09 | slashbeast | HTC sense I presume? |
| 18:50.32 | ohsix | one of them, yea |
| 18:50.33 | slashbeast | in AOSP sources (like cyanogenmod) it does create device and let you turn on USB mass storage. |
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| 18:55.59 | landley | I just emailed Fabrice Bellard to ask him how much to do qcc, so I can do a kickstarter. |
| 18:56.27 | landley | slashbeast: it sounds like cyanogenmod's hotplug support sucks. |
| 18:56.42 | landley | This is what mdev was designed to fix. THey don't seem to be using it. |
| 19:01.30 | slashbeast | landley: I am pretty sure pure AOSP (android open source project) is the same |
| 19:01.48 | slashbeast | landley: when I do emable theusb storage on system with udev, the sdb1 is created asap. |
| 19:02.02 | slashbeast | I remember that pre-182 udev versions had exact the same issue. |
| 19:02.15 | slashbeast | since 182 which does not use mknod, it does play nice |
| 19:02.24 | ohsix | normally you'd get a change event |
| 19:02.42 | landley | You have to respond to the hotplug event by opening each new block device to trigger partition probing. |
| 19:02.48 | landley | It's not hard to do, but AOSP/cyanogen isn't doing it. |
| 19:02.57 | landley | Possibly mdev isn't either, not sure. Thought it was... |
| 19:04.21 | slashbeast | there is change event? |
| 19:04.30 | slashbeast | hm |
| 19:04.54 | ohsix | udevadm --monitor can tell you what happens when you do it |
| 19:05.02 | slashbeast | dont have udev running here |
| 19:05.05 | slashbeast | I switched to mdev. |
| 19:05.27 | ohsix | my condolences |
| 19:06.49 | landley | OW OW OW OW OW http://stackoverflow.com/questions/1642028/what-is-the-name-of-this-operator |
| 19:06.52 | landley | That's... |
| 19:07.05 | landley | while (x-- > 0) the whitespace DOES NOT MATTER. |
| 19:07.08 | landley | OUCH. |
| 19:07.58 | landley | Ah, he was trolling with the question. Nevermind then. |
| 19:08.44 | slashbeast | there is no ACTION=change. |
| 19:09.18 | ohsix | not enough people realized it immediately, stack* failure |
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| 19:13.53 | ohsix | http://paste.ubuntu.com/982223/ here's all the fancy stuff someone has decided would be germane to my usage of the thing i just plugged in |
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