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iscsi: Support auto-read-only option

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If read-only=off, but auto-read-only=on is given, open the volume
read-write if we have the permissions, but instead of erroring out for
read-only volumes, just degrade to read-only.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2018-10-08 17:27:18 +02:00
parent 54ea21bd16
commit 8f3bf50d34
1 changed files with 5 additions and 3 deletions
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8
block/iscsi.c
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@ -1878,9 +1878,11 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
/* Check the write protect flag of the LUN if we want to write */
if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) &&
iscsilun->write_protected) {
error_setg(errp, "Cannot open a write protected LUN as read-write");
ret = -EACCES;
goto out;
ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp);
if (ret < 0) {
goto out;
}
flags &= ~BDRV_O_RDWR;
}
iscsi_readcapacity_sync(iscsilun, &local_err);