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| author | Nikolay Borisov <nborisov@suse.com> | 2020-07-22 11:09:22 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-10-07 12:12:15 +0200 |
| commit | f4cfa9bdd40c038ac901fbf3c57ab63e9e8eb949 (patch) | |
| tree | 7a20b38750670a960177ec071178ea99720e0801 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | btrfs: ctree: check key order before merging tree blocks (diff) | |
| download | linux-f4cfa9bdd40c038ac901fbf3c57ab63e9e8eb949.tar.gz linux-f4cfa9bdd40c038ac901fbf3c57ab63e9e8eb949.zip | |
btrfs: use RCU for quick device check in btrfs_init_new_device
When adding a new device there's a mandatory check to see if a device is
being duplicated to the filesystem it's added to. Since this is a
read-only operations not necessary to take device_list_mutex and can simply
make do with an rcu-readlock.
Using just RCU is safe because there won't be another device add delete
running in parallel as btrfs_init_new_device is called only from
btrfs_ioctl_add_dev.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions