This patch had a slight typo; fixed in the most recent patch. - Sarthak
On Thu, Apr 20, 2023 at 10:28 AM Sarthak Kukreti <sarthakkukr...@chromium.org> wrote: > > Only call truncate_bdev_range() if the fallocate mode is > supported. This fixes a bug where data in the pagecache > could be invalidated if the fallocate() was called on the > block device with an invalid mode. > > Fixes: 25f4c41415e5 ("block: implement (some of) fallocate for block devices") > Cc: sta...@vger.kernel.org > Reported-by: Darrick J. Wong <djw...@kernel.org> > Signed-off-by: Sarthak Kukreti <sarthakkukr...@chromium.org> > --- > block/fops.c | 21 ++++++++++++++++----- > 1 file changed, 16 insertions(+), 5 deletions(-) > > diff --git a/block/fops.c b/block/fops.c > index d2e6be4e3d1c..20b1eddcbe25 100644 > --- a/block/fops.c > +++ b/block/fops.c > @@ -648,24 +648,35 @@ static long blkdev_fallocate(struct file *file, int > mode, loff_t start, > > filemap_invalidate_lock(inode->i_mapping); > > - /* Invalidate the page cache, including dirty pages. */ > - error = truncate_bdev_range(bdev, file->f_mode, start, end); > - if (error) > - goto fail; > - > + /* > + * Invalidate the page cache, including dirty pages, for valid > + * de-allocate mode calls to fallocate(). > + */ > switch (mode) { > case FALLOC_FL_ZERO_RANGE: > case FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE: > + error = truncate_bdev_range(bdev, file->f_mode, start, end); > + if (error) > + goto fail; > + > error = blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT, > len >> SECTOR_SHIFT, GFP_KERNEL, > BLKDEV_ZERO_NOUNMAP); > break; > case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE: > + error = truncate_bdev_range(bdev, file->f_mode, start, end); > + if (error) > + goto fail; > + > error = blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT, > len >> SECTOR_SHIFT, GFP_KERNEL, > BLKDEV_ZERO_NOFALLBACK); > break; > case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE | > FALLOC_FL_NO_HIDE_STALE: > + error = truncate_bdev_range(bdev, file->f_mode, start, end); > + if (!error) > + goto fail; > + > error = blkdev_issue_discard(bdev, start >> SECTOR_SHIFT, > len >> SECTOR_SHIFT, GFP_KERNEL); > break; > -- > 2.40.0.396.gfff15efe05-goog > -- dm-devel mailing list dm-devel@redhat.com https://listman.redhat.com/mailman/listinfo/dm-devel