04-04-2011
Problems with udev & mounting fat32 usb storage
I have been trying to get USB storage devices to auto-mount themselves under "/media/usb/<dev>" but have been running into some problems with udev (on FC7, btw... running udevd v.106)
Every time I put in a FAT (not 32) USB stick, udev identifies it as "USB storage", identifies the partition and calls it "/dev/sdb1", triggers my rule to create a dev-alias of "/dev/sdb1" to something like "/dev/usb-sdb1", and triggers my other rule to run a "safely mount/unmount" script on that dev-alias.
The problem is when I try to use FAT32. I never get more than a "SCSI Generic" detection, thus never get a "sdb1"... in other words, it looks like FC7/udev cant identify that there is a valid partition there? The problem I have with this is that it kills the auto-mounting. I dont care if there is a dev-node for the partition itself, but if I cannot detect this situation, then I cant run the subsequent mount on "/dev/sdb" for example (which does actually work)
Is there some kind of Kernel USB/FAT32 options that need to be used for this to work? Or am I doing something stupid?
BTW - I will try to get udevmonitor output, but I don't own the machine
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LEARN ABOUT MOJAVE
systemd-udevd
SYSTEMD-UDEVD.SERVICE(8) systemd-udevd.service SYSTEMD-UDEVD.SERVICE(8)
NAME
systemd-udevd.service, systemd-udevd-control.socket, systemd-udevd-kernel.socket, systemd-udevd - Device event managing daemon
SYNOPSIS
systemd-udevd.service
systemd-udevd-control.socket
systemd-udevd-kernel.socket
/lib/systemd/systemd-udevd [--daemon] [--debug] [--children-max=] [--exec-delay=] [--event-timeout=] [--resolve-names=early|late|never]
[--version] [--help]
DESCRIPTION
systemd-udevd listens to kernel uevents. For every event, systemd-udevd executes matching instructions specified in udev rules. See
udev(7).
The behavior of the daemon can be configured using udev.conf(5), its command line options, environment variables, and on the kernel command
line, or changed dynamically with udevadm control.
OPTIONS
-d, --daemon
Detach and run in the background.
-D, --debug
Print debug messages to standard error.
-c=, --children-max=
Limit the number of events executed in parallel.
-e=, --exec-delay=
Delay the execution of RUN instructions by the given number of seconds. This option might be useful when debugging system crashes
during coldplug caused by loading non-working kernel modules.
-t=, --event-timeout=
Set the number of seconds to wait for events to finish. After this time, the event will be terminated. The default is 180 seconds.
-N=, --resolve-names=
Specify when systemd-udevd should resolve names of users and groups. When set to early (the default), names will be resolved when the
rules are parsed. When set to late, names will be resolved for every event. When set to never, names will never be resolved and all
devices will be owned by root.
-h, --help
Print a short help text and exit.
--version
Print a short version string and exit.
KERNEL COMMAND LINE
Parameters starting with "rd." will be read when systemd-udevd is used in an initrd.
udev.log_priority=, rd.udev.log_priority=
Set the log level.
udev.children_max=, rd.udev.children_max=
Limit the number of events executed in parallel.
udev.exec_delay=, rd.udev.exec_delay=
Delay the execution of RUN instructions by the given number of seconds. This option might be useful when debugging system crashes
during coldplug caused by loading non-working kernel modules.
udev.event_timeout=, rd.udev.event_timeout=
Wait for events to finish up to the given number of seconds. This option might be useful if events are terminated due to kernel drivers
taking too long to initialize.
net.ifnames=
Network interfaces are renamed to give them predictable names when possible. It is enabled by default; specifying 0 disables it.
SEE ALSO
udev.conf(5), udev(7), udevadm(8)
systemd 237 SYSTEMD-UDEVD.SERVICE(8)