Commit ad0eab92 authored by Paul Mackerras's avatar Paul Mackerras Committed by Al Viro

Fix thinko in iov_iter_single_seg_count

The branches of the if (i->type & ITER_BVEC) statement in
iov_iter_single_seg_count() are the wrong way around; if ITER_BVEC is
clear then we use i->bvec, when we should be using i->iov.  This fixes

In my case, the symptom that this caused was that a KVM guest doing
filesystem operations on a virtual disk would result in one of qemu's
threads on the host going into an infinite loop in
generic_perform_write().  The loop would hit the copied == 0 case and
call iov_iter_single_seg_count() to reduce the number of bytes to try
to process, but because of the error, iov_iter_single_seg_count()
would just return i->count and the loop made no progress and continued

Cc: # 3.16+
Signed-off-by: default avatarPaul Mackerras <>
Signed-off-by: default avatarAl Viro <>
parent 7e8631e8
......@@ -911,9 +911,9 @@ size_t iov_iter_single_seg_count(const struct iov_iter *i)
if (i->nr_segs == 1)
return i->count;
else if (i->type & ITER_BVEC)
return min(i->count, i->iov->iov_len - i->iov_offset);
return min(i->count, i->bvec->bv_len - i->iov_offset);
return min(i->count, i->iov->iov_len - i->iov_offset);
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