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Make udev rules more robust #78

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Make udev rules more robust #78

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0cae942
dmsetup: return non-zero on stdio I/O error
DemiMarie Apr 1, 2022
bedc445
Disable lvm2 udev rules if `dmsetup splitname` fails
DemiMarie Apr 1, 2022
45f8689
Disable udev rules if udev flags can't be obtained
DemiMarie Apr 1, 2022
b9ad503
Drop support for very old kernels
DemiMarie Apr 1, 2022
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4 changes: 4 additions & 0 deletions libdm/dm-tools/dmsetup.c
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Original file line number Diff line number Diff line change
Expand Up @@ -7505,5 +7505,9 @@ int main(int argc, char **argv)
if (_initial_timestamp)
dm_timestamp_destroy(_initial_timestamp);

fflush(stdout);
fflush(stderr);
if (ferror(stdout) || ferror(stderr))
return 1;
return (_switches[HELP_ARG] || _switches[VERSION_ARG]) ? 0 : ret;
}
19 changes: 5 additions & 14 deletions udev/10-dm.rules.in
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Original file line number Diff line number Diff line change
Expand Up @@ -47,10 +47,7 @@ KERNEL!="dm-[0-9]*", GOTO="dm_end"
ACTION!="add|change", GOTO="dm_end"

# Decode udev control flags and set environment variables appropriately.
# These flags are encoded in DM_COOKIE variable that was introduced in
# kernel version 2.6.31. Therefore, we can use this feature with
# kernels >= 2.6.31 only. Cookie is not decoded for remove event.
ENV{DM_COOKIE}=="?*", IMPORT{program}="(DM_EXEC)/dmsetup udevflags $env{DM_COOKIE}"
ENV{DM_COOKIE}=="?*", IMPORT{program}!="(DM_EXEC)/dmsetup udevflags $env{DM_COOKIE}", GOTO="dm_disable"

# Rule out easy-to-detect inappropriate events first.
ENV{DISK_RO}=="1", GOTO="dm_disable"
Expand Down Expand Up @@ -104,16 +101,10 @@ LABEL="dm_no_coldplug"
# |_ dev still not active 0 0
# \_ dev already active 1 0

# "dm" sysfs subdirectory is available in newer versions of DM
# only (kernels >= 2.6.29). We have to check for its existence
# and use dmsetup tool instead to get the DM name, uuid and
# suspended state if the "dm" subdirectory is not present.
# The "suspended" item was added even later (kernels >= 2.6.31),
# so we also have to call dmsetup if the kernel version used
# is in between these releases.
TEST=="dm", ENV{DM_NAME}="$attr{dm/name}", ENV{DM_UUID}="$attr{dm/uuid}", ENV{DM_SUSPENDED}="$attr{dm/suspended}"
TEST!="dm", IMPORT{program}="(DM_EXEC)/dmsetup info -j %M -m %m -c --nameprefixes --noheadings --rows -o name,uuid,suspended"
ENV{DM_SUSPENDED}!="?*", IMPORT{program}="(DM_EXEC)/dmsetup info -j %M -m %m -c --nameprefixes --noheadings --rows -o suspended"
# Kernels older than 2.6.31 do not have dm/suspended sysfs attribute and are not
# supported
ENV{DM_NAME}="$attr{dm/name}", ENV{DM_UUID}="$attr{dm/uuid}", ENV{DM_SUSPENDED}="$attr{dm/suspended}"
ENV{DM_SUSPENDED}!="?*", GOTO="dm_disable"

# dmsetup tool provides suspended state information in textual
# form with values "Suspended"/"Active". We translate it to
Expand Down
2 changes: 1 addition & 1 deletion udev/11-dm-lvm.rules.in
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Expand Up @@ -18,7 +18,7 @@ ENV{DM_UDEV_RULES_VSN}!="?*", GOTO="lvm_end"
ENV{DM_UUID}!="LVM-?*", GOTO="lvm_end"

# Use DM name and split it up into its VG/LV/layer constituents.
IMPORT{program}="(DM_EXEC)/dmsetup splitname --nameprefixes --noheadings --rows $env{DM_NAME}"
IMPORT{program}!="(DM_EXEC)/dmsetup splitname --nameprefixes --noheadings --rows $env{DM_NAME}", GOTO="lvm_disable"

# DM_SUBSYSTEM_UDEV_FLAG0 is the 'NOSCAN' flag for LVM subsystem.
# This flag is used to temporarily disable selected rules to prevent any
Expand Down