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| author | Ilya Dryomov <idryomov@gmail.com> | 2019-11-05 15:38:46 +0100 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2019-11-25 11:44:03 +0100 |
| commit | 196e2d6d0252d37be385c73f64fc8f5787a52066 (patch) | |
| tree | 0af541c1cd7a1dc4fc2f1c2364c993f72e01cb48 /drivers/block | |
| parent | rbd: don't query snapshot features (diff) | |
| download | linux-196e2d6d0252d37be385c73f64fc8f5787a52066.tar.xz linux-196e2d6d0252d37be385c73f64fc8f5787a52066.zip | |
rbd: ask for a weaker incompat mask for read-only mappings
For a read-only mapping, ask for a set of features that make the image
only unwritable rather than both unreadable and unwritable by a client
that doesn't understand them. As of today, the difference between them
for krbd is journaling (JOURNALING) and live migration (MIGRATING).
get_features method supports read_only parameter since hammer, ceph.git
commit 6176ec5fde2a ("librbd: differentiate between R/O vs R/W RBD
features").
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
Reviewed-by: Dongsheng Yang <dongsheng.yang@easystack.cn>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/rbd.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 3d8342bd6b05..3a40b5f60810 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -5669,9 +5669,12 @@ out: } static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, - u64 *snap_features) + bool read_only, u64 *snap_features) { - __le64 snapid = cpu_to_le64(snap_id); + struct { + __le64 snap_id; + u8 read_only; + } features_in; struct { __le64 features; __le64 incompat; @@ -5679,9 +5682,12 @@ static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, u64 unsup; int ret; + features_in.snap_id = cpu_to_le64(snap_id); + features_in.read_only = read_only; + ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, &rbd_dev->header_oloc, "get_features", - &snapid, sizeof(snapid), + &features_in, sizeof(features_in), &features_buf, sizeof(features_buf)); dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); if (ret < 0) @@ -5709,7 +5715,8 @@ static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, static int rbd_dev_v2_features(struct rbd_device *rbd_dev) { return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, - &rbd_dev->header.features); + rbd_is_ro(rbd_dev), + &rbd_dev->header.features); } /* |