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btrfs: cloned bios must not be iterated by bio_for_each_segment_all

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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@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-07-13 18:10:07 +02:00
parent 1014f3d68f
commit c09abff87f
4 changed files with 7 additions and 0 deletions
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3
fs/btrfs/extent_io.c
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@ -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;