Commit 8b2ded1c authored Sep 05, 2018 by Mikulas Patocka Committed by Jens Axboe Sep 05, 2018

block: don't warn when doing fsync on read-only devices



It is possible to call fsync on a read-only handle (for example, fsck.ext2
does it when doing read-only check), and this call results in kernel
warning.

The patch b089cfd9 ("block: don't warn for flush on read-only device")
attempted to disable the warning, but it is buggy and it doesn't
(op_is_flush tests flags, but bio_op strips off the flags).

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Fixes: 721c7fc7 ("block: fail op_is_write() requests to read-only partitions")
Cc: stable@vger.kernel.org	# 4.18
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent bc811f05

block/blk-core.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -2163,9 +2163,12 @@ static inline bool bio_check_ro(struct bio bio, struct hd_struct part)
		{
		const int op = bio_op(bio);

		if (part->policy && (op_is_write(op) && !op_is_flush(op))) {
		if (part->policy && op_is_write(op)) {
		char b[BDEVNAME_SIZE];

		if (op_is_flush(bio->bi_opf) && !bio_sectors(bio))
		return false;

		WARN_ONCE(1,
		"generic_make_request: Trying to write "
		"to read-only block-device %s (partno %d)\n",