Re: [PATCH 2/2] block: Hold invalidate_lock in BLKZEROOUT ioctl
From: Jan Kara <jack@suse.cz>
Date: 2021-11-09 11:59:42
On Tue 09-11-21 19:47:23, Shin'ichiro Kawasaki wrote:
When BLKZEROOUT 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 modified to call "blkdiscard -z" command
and repeated hundreds of times.
This patch can be applied back to the stable kernel version v5.15.y.
Rework is required for older stable kernels.
Fixes: 22dd6d356628 ("block: invalidate the page cache when issuing BLKZEROOUT")
Signed-off-by: Shin'ichiro Kawasaki <redacted>
Cc: stable@vger.kernel.org # v5.15Looks good to me. Feel free to add: Reviewed-by: Jan Kara <jack@suse.cz> Honza
quoted hunk ↗ jump to hunk
--- block/ioctl.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)diff --git a/block/ioctl.c b/block/ioctl.c index 9fa87f64f703..0a1d10ac2e1a 100644 --- a/block/ioctl.c +++ b/block/ioctl.c@@ -154,6 +154,7 @@ static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, { uint64_t range[2]; uint64_t start, end, len; + struct inode *inode = bdev->bd_inode; int err; if (!(mode & FMODE_WRITE))@@ -176,12 +177,17 @@ static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, return -EINVAL; /* Invalidate the page cache, including dirty pages */ + filemap_invalidate_lock(inode->i_mapping); err = truncate_bdev_range(bdev, mode, start, end); if (err) - return err; + goto fail; + + err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, + BLKDEV_ZERO_NOUNMAP); - return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, - BLKDEV_ZERO_NOUNMAP); +fail: + filemap_invalidate_unlock(inode->i_mapping); + return err; } static int put_ushort(unsigned short __user *argp, unsigned short val)-- 2.33.1
-- Jan Kara [off-list ref] SUSE Labs, CR