filesystems: add three more file system types

devtmpfs and cpuset are not actual filesystems of their own. cpuset used
to be but is now an alias for cgroupsfs. devtmpfs is the same as tmpfs
as its just a "named superblock", i.e. a specific instance of tmpfs, but
not a file system of its own.

src/basic/filesystems-gperf.gperf

@@ -34,6 +34,7 @@ binfmt_misc,     {BINFMTFS_MAGIC}
 bpf,             {BPF_FS_MAGIC}
 btrfs,           {BTRFS_SUPER_MAGIC}
 btrfs_test_fs,   {BTRFS_TEST_MAGIC}
+cpuset,          {CGROUP_SUPER_MAGIC}
 ceph,            {CEPH_SUPER_MAGIC}
 cgroup2,         {CGROUP2_SUPER_MAGIC}
 cgroup,          {CGROUP_SUPER_MAGIC}
@@ -45,6 +46,7 @@ dax,             {DAXFS_MAGIC}
 debugfs,         {DEBUGFS_MAGIC}
 devmem,          {DEVMEM_MAGIC}
 devpts,          {DEVPTS_SUPER_MAGIC}
+devtmpfs,        {TMPFS_MAGIC}
 dmabuf,          {DMA_BUF_MAGIC}
 ecryptfs,        {ECRYPTFS_SUPER_MAGIC}
 efivarfs,        {EFIVARFS_MAGIC}
@@ -88,6 +90,7 @@ qnx6,            {QNX6_SUPER_MAGIC}
 ramfs,           {RAMFS_MAGIC}
 resctrl,         {RDTGROUP_SUPER_MAGIC}
 reiserfs,        {REISERFS_SUPER_MAGIC}
+rpc_pipefs,      {RPC_PIPEFS_SUPER_MAGIC}
 secretmem,       {SECRETMEM_MAGIC}
 securityfs,      {SECURITYFS_MAGIC}
 selinuxfs,       {SELINUX_MAGIC}

src/basic/missing_magic.h

@@ -172,3 +172,8 @@
 #ifndef EXFAT_SUPER_MAGIC
 #define EXFAT_SUPER_MAGIC 0x2011BAB0UL
 #endif
+
+/* Not exposed yet, internally actually called RPCAUTH_GSSMAGIC. Defined in net/sunrpc/rpc_pipe.c */
+#ifndef RPC_PIPEFS_SUPER_MAGIC
+#define RPC_PIPEFS_SUPER_MAGIC 0x67596969
+#endif