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| author |  Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
| 2021-11-09 19:47:22 +0900 |
|---|---|---|
| committer |  Jens Axboe <axboe@kernel.dk>
| 2021-11-09 12:41:12 -0700 |
| commit | 7607c44c157d343223510c8ffdf7206fdd2a6213 (patch) | |
| tree | 5d583e2d24b462f62bad819bd52c45f50d6d16d9 /samples/ftrace/sample-trace-array.h | |
| parent | Merge tag 'for-5.16/drivers-2021-11-09' of git://git.kernel.dk/linux-block (diff) | |
| download | linux-7607c44c157d343223510c8ffdf7206fdd2a6213.tar.gz linux-7607c44c157d343223510c8ffdf7206fdd2a6213.tar.bz2 linux-7607c44c157d343223510c8ffdf7206fdd2a6213.zip | |
block: Hold invalidate_lock in BLKDISCARD ioctl
When BLKDISCARD ioctl and data read race, the data read leaves stale
page cache. To avoid the stale page cache, hold invalidate_lock of the
block device file mapping. The stale page cache is observed when
blktests test case block/009 is repeated hundreds of times.
This patch can be applied back to the stable kernel version v5.15.y
with slight patch edit. Rework is required for older stable kernels.
Fixes: 351499a172c0 ("block: Invalidate cache on discard v2")
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Cc: stable@vger.kernel.org # v5.15
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20211109104723.835533-2-shinichiro.kawasaki@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'samples/ftrace/sample-trace-array.h')
0 files changed, 0 insertions, 0 deletions