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udev-extraconf/mount.sh: only mount devices on hotplug

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fdisk from util-linux (2.31.1) and above allows the user to
manipulate an already mounted device. In order to achieve this
functionality it issues a BLKRRPART (block device re-read part)
ioctl and in response the kernel generates remove/change/add
events if the device is not mounted (manually unmounted etc)
which are caught and processed by udev. This causes our auto-mounter
to remount everything because it does not keep track and things
go out of control.
Differentiating between types of remove events such as the one
described above (generated by BLKRRPART) and one where the device
is physically plugged out is only possible using the DEVPATH variable
which is cleaned up only when the device is actually plugged-out.
This fixes the above anomaly by only mounting a device in add event
which is cleaned up properly (tmp cache deleted) in the remove event
or is not present in the tmp cache while making use of the DEVPATH
variable during the remove action.

(From OE-Core rev: 35b18c5721cae13eb206631ee1dc0c14d3d52046)

Signed-off-by: Awais Belal <awais_belal@mentor.com>
Signed-off-by: Muhammad Hamza <muhammad_hamza@mentor.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
(cherry picked from commit 11a5e6c17535438ea1e7a8403ed260c8b3a22bc8)
Signed-off-by: Ming Liu <liu.ming50@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Muhammad Hamza
2022-07-17 14:56:44 +02:00
committed by Richard Purdie
parent 40af8a94d8
commit 8eafba72be
1 changed files with 27 additions and 7 deletions
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34
meta/recipes-core/udev/udev-extraconf/mount.sh
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@@ -45,6 +45,13 @@ automount_systemd() {
return
fi
# Only go for auto-mounting when the device has been cleaned up in remove
# or has not been identified yet
if [ -e "/tmp/.automount-$name" ]; then
logger "mount.sh/automount" "[$MOUNT_BASE/$name] is already cached"
return
fi
# Skip the partition which are already in /etc/fstab
grep "^[[:space:]]*$DEVNAME" /etc/fstab && return
for n in LABEL PARTLABEL UUID PARTUUID; do
@@ -100,6 +107,13 @@ automount() {
# Get the unique name for mount point
get_label_name "${DEVNAME}"
# Only go for auto-mounting when the device has been cleaned up in remove
# or has not been identified yet
if [ -e "/tmp/.automount-$name" ]; then
logger "mount.sh/automount" "[$MOUNT_BASE/$name] is already cached"
return
fi
! test -d "$MOUNT_BASE/$name" && mkdir -p "$MOUNT_BASE/$name"
# Silent util-linux's version of mounting auto
if [ "x`readlink $MOUNT`" = "x/bin/mount.util-linux" ] ;
@@ -172,12 +186,18 @@ if [ "$ACTION" = "add" ] && [ -n "$DEVNAME" ] && [ -n "$ID_FS_TYPE" -o "$media_t
fi
if [ "$ACTION" = "remove" ] || [ "$ACTION" = "change" ] && [ -x "$UMOUNT" ] && [ -n "$DEVNAME" ]; then
for mnt in `cat /proc/mounts | grep "$DEVNAME" | cut -f 2 -d " " `
do
$UMOUNT $mnt
done
# Remove empty directories from auto-mounter
name="`basename "$DEVNAME"`"
test -e "/tmp/.automount-$name" && rm_dir "$MOUNT_BASE/$name"
tmpfile=`find /tmp | grep "\.automount-.*${name}$"`
if [ ! -e "/sys/$DEVPATH" -a -e "$tmpfile" ]; then
logger "mount.sh/remove" "cleaning up $DEVNAME, was mounted by the auto-mounter"
for mnt in `cat /proc/mounts | grep "$DEVNAME" | cut -f 2 -d " " `
do
$UMOUNT $mnt
done
# Remove mount directory created by the auto-mounter
# and clean up our tmp cache file
mntdir=`cat "$tmpfile"`
rm_dir "$MOUNT_BASE/$mntdir"
rm "$tmpfile"
fi
fi