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blockdev: read-only-mode for blockdev-change-medium

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Add an option to qmp_blockdev_change_medium() which allows changing the
read-only status of the block device whose medium is changed.

Some drives do not have a inherently fixed read-only status; for
instance, floppy disks can be set read-only or writable independently of
the drive. Some users may find it useful to be able to therefore change
the read-only status of a block device when changing the medium.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2015-11-11 04:49:44 +01:00 • committed by Kevin Wolf
parent 1068674927
commit 39ff43d9e1
6 changed files with 72 additions and 4 deletions
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22
blockdev.c
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@ -2145,6 +2145,8 @@ void qmp_blockdev_insert_medium(const char *device, const char *node_name,
void qmp_blockdev_change_medium(const char *device, const char *filename,
bool has_format, const char *format,
bool has_read_only,
BlockdevChangeReadOnlyMode read_only,
Error **errp)
{
BlockBackend *blk;
@ -2166,6 +2168,26 @@ void qmp_blockdev_change_medium(const char *device, const char *filename,
bdrv_flags = blk_get_open_flags_from_root_state(blk);
if (!has_read_only) {
read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
}
switch (read_only) {
case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
break;
case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
bdrv_flags &= ~BDRV_O_RDWR;
break;
case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
bdrv_flags |= BDRV_O_RDWR;
break;
default:
abort();
}
if (has_format) {
options = qdict_new();
qdict_put(options, "driver", qstring_from_str(format));