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authorKent Overstreet <kent.overstreet@linux.dev>2024-02-06 21:56:15 -0500
committerChristian Brauner <brauner@kernel.org>2024-02-08 21:19:59 +0100
commita4af51ce229b1e1eab003966dbfebf9d80093a77 (patch)
tree764a2915360b2a16216a5e7e873361e4716ad7a2 /fs/kernfs
parent6613476e225e090cc9aad49be7fa504e290dd33d (diff)
fs: super_set_uuid()
Some weird old filesytems have UUID-like things that we wish to expose as UUIDs, but are smaller; add a length field so that the new FS_IOC_(GET|SET)UUID ioctls can handle them in generic code. And add a helper super_set_uuid(), for setting nonstandard length uuids. Helper is now required for the new FS_IOC_GETUUID ioctl; if super_set_uuid() hasn't been called, the ioctl won't be supported. Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev> Link: https://lore.kernel.org/r/20240207025624.1019754-2-kent.overstreet@linux.dev Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/kernfs')
-rw-r--r--fs/kernfs/mount.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 0c93cad0f0ac..e29f4edf9572 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -358,7 +358,9 @@ int kernfs_get_tree(struct fs_context *fc)
}
sb->s_flags |= SB_ACTIVE;
- uuid_gen(&sb->s_uuid);
+ uuid_t uuid;
+ uuid_gen(&uuid);
+ super_set_uuid(sb, uuid.b, sizeof(uuid));
down_write(&root->kernfs_supers_rwsem);
list_add(&info->node, &info->root->supers);