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swim: Return -EROFS when opened with BLK_OPEN_WRITE flag

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Write requests are not supported by the driver and produce IO errors as
shown below. Avoid this by returning -EROFS when opened for writing.

[ 4111.690000] I/O error, dev fd0, sector 2 op 0x1:(WRITE) flags 0x800800 phys_seg 1 prio class 2
[ 4111.700000] Buffer I/O error on dev fd0, logical block 2, lost async page write

Fixes: 8852ecd974 ("m68k: mac - Add SWIM floppy support")
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Link: https://patch.msgid.link/327be6ca3c92c3411b5dfaeede014ed65a2d0f0f.1790641175.git.fthain@linux-m68k.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Finn Thain 2026-09-29 10:19:35 +10:00 committed by Jens Axboe
parent e7a6727dea
commit d8fe777978
1 changed files with 2 additions and 1 deletions
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3
drivers/block/swim.c
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@ -639,7 +639,8 @@ static int floppy_open(struct gendisk *disk, blk_mode_t mode)
if (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE)) {
if (disk_check_media_change(disk) && fs->disk_in)
fs->ejected = 0;
if ((mode & BLK_OPEN_WRITE) && fs->write_protected) {
if (mode & BLK_OPEN_WRITE) {
/* Write support isn't implemented. */
err = -EROFS;
goto out;
}