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| author | Ilya Dryomov <idryomov@gmail.com> | 2017-04-13 13:17:39 +0300 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2017-05-04 10:19:23 +0300 |
| commit | f9bebd580360c141b5fdbede9cc13a4caf23cd1a (patch) | |
| tree | ab3d7c8f24c84001554e6159e7eb00b1e24e62d3 | |
| parent | 14bb211d324d6c8140167bd6b2b8a80757348a2f (diff) | |
| download | linux-f9bebd580360c141b5fdbede9cc13a4caf23cd1a.tar.xz | |
rbd: kill rbd_is_lock_supported()
Currently the exclusive lock is acquired only if the mapping is
writable, i.e. an image HEAD mapped in rw mode. This means that we
don't acquire the lock for executing a read from a snapshot or an image
HEAD mapped in ro mode, even if lock_on_read is set. This is somewhat
weird and inconsistent with "no automatic exclusive lock transfers"
mode, where the lock is acquired unconditionally.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
| -rw-r--r-- | drivers/block/rbd.c | 14 |
1 files changed, 3 insertions, 11 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 063c8f06fb9c..e3fafaf97dee 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -478,13 +478,6 @@ static int minor_to_rbd_dev_id(int minor) return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; } -static bool rbd_is_lock_supported(struct rbd_device *rbd_dev) -{ - return (rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK) && - rbd_dev->spec->snap_id == CEPH_NOSNAP && - !rbd_dev->mapping.read_only; -} - static bool __rbd_is_lock_owner(struct rbd_device *rbd_dev) { return rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED || @@ -4052,10 +4045,6 @@ static void rbd_queue_workfn(struct work_struct *work) if (op_type != OBJ_OP_READ) { snapc = rbd_dev->header.snapc; ceph_get_snap_context(snapc); - must_be_locked = rbd_is_lock_supported(rbd_dev); - } else { - must_be_locked = rbd_dev->opts->lock_on_read && - rbd_is_lock_supported(rbd_dev); } up_read(&rbd_dev->header_rwsem); @@ -4066,6 +4055,9 @@ static void rbd_queue_workfn(struct work_struct *work) goto err_rq; } + must_be_locked = + (rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK) && + (op_type != OBJ_OP_READ || rbd_dev->opts->lock_on_read); if (must_be_locked) { down_read(&rbd_dev->lock_rwsem); if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED && |