Public bug reported:
SRU Justification: (Trusty, Utopic)
[Impact]
Remounting from compress-force to compress could not clear compress-force
option. The problem is there is no way for users to clear compress-force option
separately.
[Fix]
upstream commit 4027e0f4c4b2df28d564560a3c65c179bebae4c8
"Btrfs: clear compress-force when remounting with compress option"
this is a simple one-liner, risk is low to zero.
[Testcase]
See attached hacked up bash script.btrfs: Without the fix I can reproduce the
oops every time. With the fix, it works perfectly.
echo "MNT=$MNT"
echo "TMP=$TMP"
TMPIMG=$TMP/test.img
DEV=/dev/loop0
truncate --size 1500m $TMPIMG
losetup $DEV $TMPIMG
mkfs.btrfs -f $DEV
mount $DEV $MNT -o compress-force=lzo
mount $DEV $MNT -o remount,compress=zlib
n=$(cat /proc/mounts | grep $DEV | grep "compress-force=zlib" | wc -l)
umount $DEV
losetup -d $DEV
rm $TMPIMG
if [ $n -eq 0 ]; then
echo "compress-force=zlib cleared in remount"
exit 0
else
echo "compress-force=zlib NOT cleared in remount"
exit 1
fi
** Affects: linux (Ubuntu)
Importance: Low
Assignee: Colin Ian King (colin-king)
Status: In Progress
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Importance: Undecided => Low
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Colin Ian King (colin-king)
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1434183
Title:
btrfs: ccompress-force needs clearing when remounting with compress
option
Status in linux package in Ubuntu:
In Progress
Bug description:
SRU Justification: (Trusty, Utopic)
[Impact]
Remounting from compress-force to compress could not clear compress-force
option. The problem is there is no way for users to clear compress-force option
separately.
[Fix]
upstream commit 4027e0f4c4b2df28d564560a3c65c179bebae4c8
"Btrfs: clear compress-force when remounting with compress option"
this is a simple one-liner, risk is low to zero.
[Testcase]
See attached hacked up bash script.btrfs: Without the fix I can reproduce the
oops every time. With the fix, it works perfectly.
echo "MNT=$MNT"
echo "TMP=$TMP"
TMPIMG=$TMP/test.img
DEV=/dev/loop0
truncate --size 1500m $TMPIMG
losetup $DEV $TMPIMG
mkfs.btrfs -f $DEV
mount $DEV $MNT -o compress-force=lzo
mount $DEV $MNT -o remount,compress=zlib
n=$(cat /proc/mounts | grep $DEV | grep "compress-force=zlib" | wc -l)
umount $DEV
losetup -d $DEV
rm $TMPIMG
if [ $n -eq 0 ]; then
echo "compress-force=zlib cleared in remount"
exit 0
else
echo "compress-force=zlib NOT cleared in remount"
exit 1
fi
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