On Thu, Jul 13, 2017 at 06:15:36PM +0200, David Sterba wrote: > We've started using cloned bios more in 4.13, there are some specifics > regarding the iteration. Filipe found [1] that the raid56 iterated a > cloned bio using bio_for_each_segment_all, which is incorrect. The > cloned bios have wrong bi_vcnt and this could lead to silent > corruptions. This patch adds assertions to all remaining > bio_for_each_segment_all cases. > > [1] https://patchwork.kernel.org/patch/9838535/ > Reviewed-by: Liu Bo <bo.li.liu@xxxxxxxxxx> -liubo > CC: Liu Bo <bo.li.liu@xxxxxxxxxx> > Signed-off-by: David Sterba <dsterba@xxxxxxxx> > --- > fs/btrfs/compression.c | 1 + > fs/btrfs/disk-io.c | 1 + > fs/btrfs/extent_io.c | 3 +++ > fs/btrfs/inode.c | 2 ++ > 4 files changed, 7 insertions(+) > > diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c > index fcd323eceb5b..8ba1b86c9b72 100644 > --- a/fs/btrfs/compression.c > +++ b/fs/btrfs/compression.c > @@ -152,6 +152,7 @@ static void end_compressed_bio_read(struct bio *bio) > * we have verified the checksum already, set page > * checked so the end_io handlers know about it > */ > + ASSERT(!bio_flagged(bio, BIO_CLONED)); > bio_for_each_segment_all(bvec, cb->orig_bio, i) > SetPageChecked(bvec->bv_page); > > diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c > index 1a2e0b43ef2a..f1ed7e490fca 100644 > --- a/fs/btrfs/disk-io.c > +++ b/fs/btrfs/disk-io.c > @@ -964,6 +964,7 @@ static int btree_csum_one_bio(struct bio *bio) > struct btrfs_root *root; > int i, ret = 0; > > + ASSERT(!bio_flagged(bio, BIO_CLONED)); > bio_for_each_segment_all(bvec, bio, i) { > root = BTRFS_I(bvec->bv_page->mapping->host)->root; > ret = csum_dirty_buffer(root->fs_info, bvec->bv_page); > diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c > index 9a213ed5b074..8aedcbb55da2 100644 > --- a/fs/btrfs/extent_io.c > +++ b/fs/btrfs/extent_io.c > @@ -2451,6 +2451,7 @@ static void end_bio_extent_writepage(struct bio *bio) > u64 end; > int i; > > + ASSERT(!bio_flagged(bio, BIO_CLONED)); > bio_for_each_segment_all(bvec, bio, i) { > struct page *page = bvec->bv_page; > struct inode *inode = page->mapping->host; > @@ -2521,6 +2522,7 @@ static void end_bio_extent_readpage(struct bio *bio) > int ret; > int i; > > + ASSERT(!bio_flagged(bio, BIO_CLONED)); > bio_for_each_segment_all(bvec, bio, i) { > struct page *page = bvec->bv_page; > struct inode *inode = page->mapping->host; > @@ -3674,6 +3676,7 @@ static void end_bio_extent_buffer_writepage(struct bio *bio) > struct extent_buffer *eb; > int i, done; > > + ASSERT(!bio_flagged(bio, BIO_CLONED)); > bio_for_each_segment_all(bvec, bio, i) { > struct page *page = bvec->bv_page; > > diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c > index 6b3b7152cb6c..d97579891670 100644 > --- a/fs/btrfs/inode.c > +++ b/fs/btrfs/inode.c > @@ -8058,6 +8058,7 @@ static void btrfs_retry_endio_nocsum(struct bio *bio) > ASSERT(bio->bi_io_vec->bv_len == btrfs_inode_sectorsize(inode)); > > done->uptodate = 1; > + ASSERT(!bio_flagged(bio, BIO_CLONED)); > bio_for_each_segment_all(bvec, bio, i) > clean_io_failure(BTRFS_I(inode)->root->fs_info, failure_tree, > io_tree, done->start, bvec->bv_page, > @@ -8149,6 +8150,7 @@ static void btrfs_retry_endio(struct bio *bio) > io_tree = &BTRFS_I(inode)->io_tree; > failure_tree = &BTRFS_I(inode)->io_failure_tree; > > + ASSERT(!bio_flagged(bio, BIO_CLONED)); > bio_for_each_segment_all(bvec, bio, i) { > ret = __readpage_endio_check(inode, io_bio, i, bvec->bv_page, > bvec->bv_offset, done->start, > -- > 2.13.0 > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
