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s390/dasd: Return BLK_STS_INVAL for EINVAL from do_dasd_request

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Currently, if CCW request creation fails with -EINVAL, the DASD driver
returns BLK_STS_IOERR to the block layer.

This can happen, for example, when a user-space application such as QEMU
passes a misaligned buffer, but the original cause of the error is
masked as a generic I/O error.

This patch changes the behavior so that -EINVAL is returned as
BLK_STS_INVAL, allowing user space to properly detect alignment issues
instead of interpreting them as I/O errors.

Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Cc: stable@vger.kernel.org #6.11+
Signed-off-by: Jaehoon Kim <jhkim@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jaehoon Kim 2025-09-25 17:47:07 +02:00 committed by Jens Axboe
parent f85e254b51
commit 8f4ed0ce48
1 changed files with 7 additions and 5 deletions
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12
drivers/s390/block/dasd.c
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@ -3114,12 +3114,14 @@ static blk_status_t do_dasd_request(struct blk_mq_hw_ctx *hctx,
PTR_ERR(cqr) == -ENOMEM ||
PTR_ERR(cqr) == -EAGAIN) {
rc = BLK_STS_RESOURCE;
goto out;
} else if (PTR_ERR(cqr) == -EINVAL) {
rc = BLK_STS_INVAL;
} else {
DBF_DEV_EVENT(DBF_ERR, basedev,
"CCW creation failed (rc=%ld) on request %p",
PTR_ERR(cqr), req);
rc = BLK_STS_IOERR;
}
DBF_DEV_EVENT(DBF_ERR, basedev,
"CCW creation failed (rc=%ld) on request %p",
PTR_ERR(cqr), req);
rc = BLK_STS_IOERR;
goto out;
}
/*