From: Kent Overstreet Date: Wed, 7 Feb 2024 02:56:16 +0000 (-0500) Subject: ovl: convert to super_set_uuid() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=dd9019604cdaaff1327bfd36737230f912e2780d;p=linux.git ovl: convert to super_set_uuid() We don't want to be settingc sb->s_uuid directly anymore, as there's a length field that also has to be set, and this conversion was not completely trivial. Acked-by: Amir Goldstein Signed-off-by: Kent Overstreet Link: https://lore.kernel.org/r/20240207025624.1019754-3-kent.overstreet@linux.dev Cc: Miklos Szeredi Cc: linux-unionfs@vger.kernel.org Signed-off-by: Christian Brauner --- diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c index 0217094c23ea6..ed71480d8adbe 100644 --- a/fs/overlayfs/util.c +++ b/fs/overlayfs/util.c @@ -760,13 +760,14 @@ bool ovl_init_uuid_xattr(struct super_block *sb, struct ovl_fs *ofs, const struct path *upperpath) { bool set = false; + uuid_t uuid; int res; /* Try to load existing persistent uuid */ - res = ovl_path_getxattr(ofs, upperpath, OVL_XATTR_UUID, sb->s_uuid.b, + res = ovl_path_getxattr(ofs, upperpath, OVL_XATTR_UUID, uuid.b, UUID_SIZE); if (res == UUID_SIZE) - return true; + goto set_uuid; if (res != -ENODATA) goto fail; @@ -794,17 +795,20 @@ bool ovl_init_uuid_xattr(struct super_block *sb, struct ovl_fs *ofs, } /* Generate overlay instance uuid */ - uuid_gen(&sb->s_uuid); + uuid_gen(&uuid); /* Try to store persistent uuid */ set = true; - res = ovl_setxattr(ofs, upperpath->dentry, OVL_XATTR_UUID, sb->s_uuid.b, + res = ovl_setxattr(ofs, upperpath->dentry, OVL_XATTR_UUID, uuid.b, UUID_SIZE); - if (res == 0) - return true; + if (res) + goto fail; + +set_uuid: + super_set_uuid(sb, uuid.b, sizeof(uuid)); + return true; fail: - memset(sb->s_uuid.b, 0, UUID_SIZE); ofs->config.uuid = OVL_UUID_NULL; pr_warn("failed to %s uuid (%pd2, err=%i); falling back to uuid=null.\n", set ? "set" : "get", upperpath->dentry, res);