This patch series fixes 2 additional races between array resizing and
array element access when performing online resizing of the arrays
s_group_info and s_flex_groups.
These patches apply on top of the patch:
[PATCH RFC] ext4: fix potential race between online resizing and write operations
The macro sbi_array_rcu_deref() is introduced for simplicity but can be
removed if undesired.
Tested by performing the following:
truncate -s 100G /tmp/foo
sudo bash -c 'while true; do dd if=/dev/zero of=/mnt/xxx bs=1M count=1; sync; \
rm /mnt/xxx; done' &
while true; do mkfs.ext4 -b 1024 -E resize=26213883 /tmp/foo 2096635 -F; \
sudo mount -o loop /tmp/foo /mnt; sudo resize2fs /dev/loop0 26213883; \
sudo umount /mnt; done
Suraj Jitindar Singh (3):
ext4: introduce macro sbi_array_rcu_deref() to access rcu protected
fields
ext4: fix potential race between s_group_info online resizing and
access
ext4: fix potential race between s_flex_groups online resizing and
access
fs/ext4/balloc.c | 11 +++++-----
fs/ext4/ext4.h | 25 +++++++++++++++++----
fs/ext4/ialloc.c | 21 +++++++++++-------
fs/ext4/mballoc.c | 19 ++++++++++------
fs/ext4/resize.c | 4 ++--
fs/ext4/super.c | 56 ++++++++++++++++++++++++++++++++---------------
6 files changed, 91 insertions(+), 45 deletions(-)
--
2.17.1
