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sfdisk: add hint about udev and flock to the man page 

Addresses: https://github.com/karelzak/util-linux/issues/563
Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Karel Zak 2018-01-17 16:30:06 +01:00
parent 88e5d289d5
commit aefa920a79
1 changed files with 16 additions and 0 deletions
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16
disk-utils/sfdisk.8
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@ -58,6 +58,22 @@ does.
It is necessary to explicitly create all partitions including whole-disk system
partitions.
.B sfdisk
uses BLKRRPART (reread partition table) ioctl to make sure that the device is
not used by system or another tools (see also --no-reread). It's possible that
this feature or another sfdisk activity races with \fBudevd\fR. The recommended way
how to avoid possible collisions is to use exclusive flock for the whole-disk
device to serialize device access. The exclusive lock will cause udevd to skip
the event handling on the device. For example:
.RS
.sp
.nf
.B "flock /dev/sdc sfdisk /dev/sdc"
.fi
.sp
.RE
Note, this semantic is not currently supported by udevd for MD and DM devices.
.SH COMMANDS
The commands are mutually exclusive.
.TP