A few paths throughout the code get the fsid for the current mount by
using the copy of the super block that we store in the scoutfs_sb_info
for the mount. We'd like to remove the super block from the sbi and
it's cleaner to have a specific constant field for the fsid of the mount
which will not change.
Signed-off-by: Zach Brown <zab@versity.com>
scoutfs_sysfs_exit() is called during error handling in module init.
When scoutfs is built-in (so, never.) the __exit section won't be
loaded. Remove the __exit annotation so it's always available to be
called.
Signed-off-by: Zach Brown <zab@versity.com>
We had previously started on a relatively simple notion of an
interoperability version which wasn't quite right. This fleshes out
support for a more functional format version. The super blocks have a
single version that defines behaviour of the running system. The code
supports a range of versions and we add some initial interfaces for
updating the version while the system is offline. All of this together
should let us safely change the underlying format over time.
Signed-off-by: Zach Brown <zab@versity.com>
Add sysfs attribute creation that can provide the parent dir kobject
instead of always creating the sysfs object dir off of the main
per-mount dir.
Signed-off-by: Zach Brown <zab@versity.com>
Add some helpers to manage the lifetime of groups of attributes in
sysfs. We can wait until the sysfs files are no longer in use
before tearing down the data that they rely on.
Signed-off-by: Zach Brown <zab@versity.com>
I wanted to add a sysfs file that exports the fsid for the mount of a
given device. But our use of sysfs was confusing and spread through
super.c and counters.c.
This moves the core of our sysfs use to sysfs.c. Instead of defining
the per-mount dir as a kset we define it as an object with attributes
which gives us a place to add an fsid attribute.
counters still have their own whack of sysfs implementation. We'll let
it keep it for now but we could move it into sysfs.c. It's just counter
interation around the insane sysfs obj/attr/type nonsense. For now it
just needs to know to add its counters dir as a child of the per-mount
dir instead of adding it to the kset.
Signed-off-by: Zach Brown <zab@versity.com>
