linux-kernel - [PATCH] block/swim: Return -EROFS for FMODE

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Message-Id: <34350e8aeb63c19f5b204c3f7b961a99708b50ff.1550182390.git.fthain@telegraphics.com.au>
Date:   Fri, 15 Feb 2019 09:13:10 +1100
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-m68k@...ts.linux-m68k.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] block/swim: Return -EROFS for FMODE_WRITE

Write requests are not supported by the driver and result in IO errors:

print_req_error: I/O error, dev fd0, sector 0
buffer_io_error: 26 callbacks suppressed
Buffer I/O error on dev fd0, logical block 0, lost async page write
Buffer I/O error on dev fd0, logical block 1, lost async page write
Buffer I/O error on dev fd0, logical block 2, lost async page write
Buffer I/O error on dev fd0, logical block 3, lost async page write
Buffer I/O error on dev fd0, logical block 4, lost async page write
Buffer I/O error on dev fd0, logical block 5, lost async page write
Buffer I/O error on dev fd0, logical block 6, lost async page write
Buffer I/O error on dev fd0, logical block 7, lost async page write
Buffer I/O error on dev fd0, logical block 8, lost async page write
Buffer I/O error on dev fd0, logical block 9, lost async page write
print_req_error: I/O error, dev fd0, sector 2688
print_req_error: I/O error, dev fd0, sector 0

Cc: linux-m68k@...ts.linux-m68k.org
Tested-by: Stan Johnson <userm57@...oo.com>
Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
---
 drivers/block/swim.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/swim.c b/drivers/block/swim.c
index 3fa6fcc34790..dd19f422fb0d 100644
--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -643,7 +643,7 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
 
 	if (mode & (FMODE_READ|FMODE_WRITE)) {
 		check_disk_change(bdev);
-		if ((mode & FMODE_WRITE) && fs->write_protected) {
+		if (mode & FMODE_WRITE) { /* not implemented */
 			err = -EROFS;
 			goto out;
 		}
-- 
2.19.2