Once multi-page bvec is enabled, the last bvec may include more than one page, this patch use bvec_last_segment() to truncate the bio.
Cc: Dave Chinner <[email protected]> Cc: Kent Overstreet <[email protected]> Cc: Mike Snitzer <[email protected]> Cc: [email protected] Cc: Alexander Viro <[email protected]> Cc: [email protected] Cc: Shaohua Li <[email protected]> Cc: [email protected] Cc: [email protected] Cc: David Sterba <[email protected]> Cc: [email protected] Cc: Darrick J. Wong <[email protected]> Cc: [email protected] Cc: Gao Xiang <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: Theodore Ts'o <[email protected]> Cc: [email protected] Cc: Coly Li <[email protected]> Cc: [email protected] Cc: Boaz Harrosh <[email protected]> Cc: Bob Peterson <[email protected]> Cc: [email protected] Signed-off-by: Ming Lei <[email protected]> --- fs/buffer.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/buffer.c b/fs/buffer.c index 1286c2b95498..fa37ad52e962 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -3032,7 +3032,10 @@ void guard_bio_eod(int op, struct bio *bio) /* ..and clear the end of the buffer for reads */ if (op == REQ_OP_READ) { - zero_user(bvec->bv_page, bvec->bv_offset + bvec->bv_len, + struct bio_vec bv; + + bvec_last_segment(bvec, &bv); + zero_user(bv.bv_page, bv.bv_offset + bv.bv_len, truncated_bytes); } } -- 2.9.5
