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We can not predict the major/minor of non-existing devices:
$ grep . /sys/class/block/sd*/dev
/sys/class/block/sda1/dev:259:524288
/sys/class/block/sda2/dev:259:262144
/sys/class/block/sda3/dev:259:786432
/sys/class/block/sda4/dev:259:131072
/sys/class/block/sda/dev:259:0
/sys/class/block/sdb/dev:259:655360
/sys/class/block/sdc/dev:259:393216
If this functionality is still needed for some broken hardware, it needs to be
solved with a tool not part of the udev package. Because such option is unreliable
and unsafe to use.
Recent udisks versions, for LVM2 integration, ships with probers that
produce very long lines such as
UDISKS_LVM2_PV_VG_PV_LIST=
uuid=98lyZl-Ya7U-p26Z-Ia7b-xf8u-xZqP-jc4njb;size=2000397795328;allocated_size=2000397795328
uuid=iFs0cM-sxCF-ceQK-hZl1-kbwo-ZTjq-gSewQR;size=2000397795328;allocated_size=2000397795328
[...]
e.g. roughly 100 bytes per LVM2 physical volume for each LVM2
PV encountered.
Signed-off-by: David Zeuthen <davidz@redhat.com>
This function is useful for anything that's likely to be running
alongside udevd during cold-plugging, and is using libudev to
receive the events.
It makes little sense for it to be private, or to require other
software to relearn how to adjust the buffer size.
Signed-off-by: Scott James Remnant <scott@ubuntu.com>
We need to prevent that libudev parses half-written database files.
Also for "change" events, we need to make sure, that database files
always exist to be read by libudev, and that they are not first deleted
before they are re-created.
The move_later_prefix variable was reset to zero on each
loop iteration, and thus the move_later entry (if any) was
not added right after changing to another syspath prefix,
but rather after exiting the enumeration loop.
It handles only RUN but not IMPORT and PROGRAM. There is no sane way
to suppress program execution. Most important programs run with IMPORT
these days. Also events can no longer suppressed with the libudev
netlink messages, so UDEV_RUN does nothing useful and is just
inconsistent.
When libudev.h is included from C++ code, wrap the declarations in an
extern "C" { ... } block. This tells the C++ compiler that symbols
are exported with C linkage and no name-mangling.
These retry loops are required where create_path() could race with
delete_path(). But only the main udevd process writes to the queue,
so no races will happen here.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
The previous patch was almost, but not quite, correct. Rather than
restoring the signal mask it actually tried to make an even more
restrictive signal mask (had SIGALRM been blocked when udevd started,
anyway).
Fix it harder.
Signed-off-by: Scott James Remnant <scott@ubuntu.com>
On 8/29/09, Florian Zumbiehl <florz@florz.de> wrote:
> Could it happen that > util_create_path() and util_delete_path()
> do run in parallel for > the same directory? After all, util_create_path()
> does handle > the case where creation of the directory happens in parallel
> to it running, so it doesn't seem all that unlikely to me ...
With well defined and kernel-supplied node names, we no longer need
to support a possible stack of conflicting symlinks and node names.
Only symlinks with identical names can be claimed by multiple devices.
This shrinks the former /dev/.udev/names/ significantly.
Also the /dev/{block,char}/MAJ:MIN" links are excluded from the name
stack - they are unique and can not conflict.
I'm not sure how likely it is for UTIL_PATH_SIZE to have an odd value
(maybe it has right now? :-), but I guess making this universally correct
doesn't hurt ...
External programs triggered by events (via RUN=) will inherit udev's
signal mask, which is set to block all but SIGALRM. For most utilities,
this is OK, but if we start daemons from RUN=, we run into trouble
(especially as SIGCHLD is blocked).
This change saves the original sigmask when udev starts, and restores it
just before we exec() the external command.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
On Mon, Aug 24, 2009 at 19:50, Lennart Poettering<lennart@poettering.net> wrote:
> One little comment here: on POSIX getrnam_r() doesn't touch
> errno. Instead it returns the error value as return value.
With very deeply nested devices, We can not use a single file
name to carry an entire DEVPATH. Use <subsystem>:<sysname> as
the database filename, which should also simplify the handling
of devices moving around, as these values will not change but
still be unique.
For the name stack we use the <maj>:<min> now as the filename.
> On Tue, Aug 18, 2009 at 09:59:56AM -0400, Ric Wheeler wrote:
> The first is that udev grumbles during boot about "file name too long"
> like the following:
>
> Aug 17 06:49:58 megadeth udevd-event[20447]: unable to create db file
> '/dev/.udev/db/\x2fdevices\x2fpci0000:00\x2f0000:00:04.0\x2f0000:17:00.0\x2f0000:18:0a.0\x2f0000:1f:00.0\x2fhost11\x2fport-11:0\x2fexpander-11:0\x2fport-11:0:0\x2fexpander-11:1\x2fport-11:1:0\x2fexpander-11:2\x2fport-11:2:17\x2fexpander-11:3\x2fport-11:3:1\x2fend_device-11:3:1\x2fbsg\x2fend_device-11:3:1':
> File name too long
Obviously someone forgot something here or didn't use -ansi. Either way,
index is nowhere declared so I assume the current behaviour is to check
against the index() function coming from somewhere in the POSIX headers.
The comparison doesn't make sense then.
Signed-off-by: Daniel Mierswa <impulze@impulze.org>
Fix spelling in docbook comments, code comments, and a local variable
name. Thanks to "ispell -h" for docbook HTML and "scspell" for source
code.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
