From c09abff87f90c81d74b6483837a665f97448a475 Mon Sep 17 00:00:00 2001 From: David Sterba Date: Thu, 13 Jul 2017 18:10:07 +0200 Subject: btrfs: cloned bios must not be iterated by bio_for_each_segment_all 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 Signed-off-by: David Sterba --- fs/btrfs/extent_io.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'fs/btrfs/extent_io.c') diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 2e6f69908303..a3122fba54e8 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2452,6 +2452,7 @@ 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; @@ -2522,6 +2523,7 @@ 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; @@ -3675,6 +3677,7 @@ 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; -- cgit v1.2.3