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block: don't warn for flush on read-only device

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[ Upstream commit b089cfd95d32638335c551651a8e00fd2c4edb0b ]

Don't warn for a flush issued to a read-only device. It's not strictly
a writable command, as it doesn't change any on-media data by itself.

Reported-by: Stefan Agner <stefan@agner.ch>
Fixes: 721c7fc701c7 ("block: fail op_is_write() requests to read-only partitions")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2018-08-14 10:52:40 -06:00 committed by Greg Kroah-Hartman
parent 534dde34bb
commit b02fd8a8dc
1 changed files with 3 additions and 1 deletions
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4
block/blk-core.c
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@ -2159,7 +2159,9 @@ static inline bool should_fail_request(struct hd_struct *part,
static inline bool bio_check_ro(struct bio *bio, struct hd_struct *part)
{
if (part->policy && op_is_write(bio_op(bio))) {
const int op = bio_op(bio);
if (part->policy && (op_is_write(op) && !op_is_flush(op))) {
char b[BDEVNAME_SIZE];
WARN_ONCE(1,