This is a note to let you know that I've just added the patch titled block: Hold invalidate_lock in BLKDISCARD ioctl to the 5.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: block-hold-invalidate_lock-in-blkdiscard-ioctl.patch and it can be found in the queue-5.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 7607c44c157d343223510c8ffdf7206fdd2a6213 Mon Sep 17 00:00:00 2001 From: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx> Date: Tue, 9 Nov 2021 19:47:22 +0900 Subject: block: Hold invalidate_lock in BLKDISCARD ioctl From: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx> commit 7607c44c157d343223510c8ffdf7206fdd2a6213 upstream. 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@xxxxxxx> Cc: stable@xxxxxxxxxxxxxxx # v5.15 Reviewed-by: Jan Kara <jack@xxxxxxx> Link: https://lore.kernel.org/r/20211109104723.835533-2-shinichiro.kawasaki@xxxxxxx Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- block/ioctl.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) --- a/block/ioctl.c +++ b/block/ioctl.c @@ -112,6 +112,7 @@ static int blk_ioctl_discard(struct bloc uint64_t range[2]; uint64_t start, len; struct request_queue *q = bdev_get_queue(bdev); + struct inode *inode = bdev->bd_inode; int err; if (!(mode & FMODE_WRITE)) @@ -134,12 +135,17 @@ static int blk_ioctl_discard(struct bloc if (start + len > i_size_read(bdev->bd_inode)) return -EINVAL; + filemap_invalidate_lock(inode->i_mapping); err = truncate_bdev_range(bdev, mode, start, start + len - 1); if (err) - return err; + goto fail; - return blkdev_issue_discard(bdev, start >> 9, len >> 9, - GFP_KERNEL, flags); + err = blkdev_issue_discard(bdev, start >> 9, len >> 9, + GFP_KERNEL, flags); + +fail: + filemap_invalidate_unlock(inode->i_mapping); + return err; } static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, Patches currently in stable-queue which might be from shinichiro.kawasaki@xxxxxxx are queue-5.14/block-hold-invalidate_lock-in-blkresetzone-ioctl.patch queue-5.14/block-hold-invalidate_lock-in-blkzeroout-ioctl.patch queue-5.14/block-hold-invalidate_lock-in-blkdiscard-ioctl.patch