[PATCH v3 2/6] btrfs: add comments for device counts in struct btrfs_fs_devices
From: Josef Bacik <josef@toxicpanda.com>
Date: 2021-10-04 17:19:34
Subsystem:
btrfs file system, filesystems (vfs and infrastructure), the rest · Maintainers:
Chris Mason, David Sterba, Alexander Viro, Christian Brauner, Linus Torvalds
From: Anand Jain <redacted> A bug was was checking a wrong device count before we delete the struct btrfs_fs_devices in btrfs_rm_device(). To avoid future confusion and easy reference add a comment about the various device counts that we have in the struct btrfs_fs_devices. Signed-off-by: Anand Jain <redacted> --- fs/btrfs/volumes.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 83075d6855db..c7ac43d8a7e8 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h@@ -236,11 +236,30 @@ struct btrfs_fs_devices { bool fsid_change; struct list_head fs_list; + /* + * Number of devices under this fsid including missing and + * replace-target device and excludes seed devices. + */ u64 num_devices; + + /* + * The number of devices that successfully opened, including + * replace-target, excludes seed devices. + */ u64 open_devices; + + /* The number of devices that are under the chunk allocation list. */ u64 rw_devices; + + /* Count of missing devices under this fsid excluding seed device. */ u64 missing_devices; u64 total_rw_bytes; + + /* + * Count of devices from btrfs_super_block::num_devices for this fsid, + * which includes the seed device, excludes the transient replace-target + * device. + */ u64 total_devices; /* Highest generation number of seen devices */
--
2.26.3