>>>>> "Peter" == Peter Korsgaard <peter@xxxxxxxxxxxxx> writes: > Just calling wait_for_device_probe() is not enough to ensure that > asynchronously probed block devices are available (E.G. mmc, usb, ..), so > add a "dm-mod.waitfor=<device1>[,..,<deviceN>]" parameter to get dm-init to > explicitly wait for specific block devices before initializing the tables > with logic similar to the rootwait logic in init/do_mounts.c. > E.G. with dm-verity on mmc with > dm-mod.waitfor="PARTLABEL=hash-a,PARTLABEL=root-a" > [ 0.671671] device-mapper: init: waiting for all devices to be available before creating mapped devices > [ 0.671679] device-mapper: init: waiting for PARTLABEL=hash-a > [ 0.710695] mmc0: new HS200 MMC card at address 0001 > [ 0.711158] mmcblk0: mmc0:0001 004GA0 3.69 GiB > [ 0.715954] mmcblk0boot0: mmc0:0001 004GA0 partition 1 2.00 MiB > [ 0.722085] mmcblk0boot1: mmc0:0001 004GA0 partition 2 2.00 MiB > [ 0.728093] mmcblk0rpmb: mmc0:0001 004GA0 partition 3 512 KiB, chardev (249:0) > [ 0.738274] mmcblk0: p1 p2 p3 p4 p5 p6 p7 > [ 0.751282] device-mapper: init: waiting for PARTLABEL=root-a > [ 0.751306] device-mapper: init: all devices available > [ 0.751683] device-mapper: verity: sha256 using implementation "sha256-generic" > [ 0.759344] device-mapper: ioctl: dm-0 (vroot) is ready > [ 0.766540] VFS: Mounted root (squashfs filesystem) readonly on device 254:0. > Signed-off-by: Peter Korsgaard <peter@xxxxxxxxxxxxx> > --- > .../admin-guide/device-mapper/dm-init.rst | 9 ++++++++ > drivers/md/dm-init.c | 23 ++++++++++++++++++- > 2 files changed, 31 insertions(+), 1 deletion(-) > diff --git a/Documentation/admin-guide/device-mapper/dm-init.rst b/Documentation/admin-guide/device-mapper/dm-init.rst > index e5242ff17e9b..83efd8fe19d5 100644 > --- a/Documentation/admin-guide/device-mapper/dm-init.rst > +++ b/Documentation/admin-guide/device-mapper/dm-init.rst > @@ -123,3 +123,12 @@ Other examples (per target): > 0 1638400 verity 1 8:1 8:2 4096 4096 204800 1 sha256 > fb1a5a0f00deb908d8b53cb270858975e76cf64105d412ce764225d53b8f3cfd > 51934789604d1b92399c52e7cb149d1b3a1b74bbbcb103b2a0aaacbed5c08584 > + > +For setups using device-mapper on top of asynchronously probed block > +devices (MMC, USB, ..), it may be necessary to tell dm-init to > +explicitly wait for them to become available before setting up the > +device-mapper tables. This can be done with the "dm-init.waitfor=" > +module parameter, which takes a list of devices to wait for:: > + > + dm-init.waitfor=<device1>[,..,<deviceN>] > + Ups, the trailing newline should be dropped. Can you do this when applying or do you want me to resend? -- Bye, Peter Korsgaard -- dm-devel mailing list dm-devel@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/dm-devel
