nfs: add missing selections of CONFIG_CRC32

nfs.ko, nfsd.ko, and lockd.ko all use crc32_le(), which is available
only when CONFIG_CRC32 is enabled.  But the only NFS kconfig option that
selected CONFIG_CRC32 was CONFIG_NFS_DEBUG, which is client-specific and
did not actually guard the use of crc32_le() even on the client.

The code worked around this bug by only actually calling crc32_le() when
CONFIG_CRC32 is built-in, instead hard-coding '0' in other cases.  This
avoided randconfig build errors, and in real kernels the fallback code
was unlikely to be reached since CONFIG_CRC32 is 'default y'.  But, this
really needs to just be done properly, especially now that I'm planning
to update CONFIG_CRC32 to not be 'default y'.

Therefore, make CONFIG_NFS_FS, CONFIG_NFSD, and CONFIG_LOCKD select
CONFIG_CRC32.  Then remove the fallback code that becomes unnecessary,
as well as the selection of CONFIG_CRC32 from CONFIG_NFS_DEBUG.

Fixes: 1264a2f ("NFS: refactor code for calculating the crc32 hash of a filehandle")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Anna Schumaker <anna.schumaker@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

fs/Kconfig

@@ -368,6 +368,7 @@ config GRACE_PERIOD
 config LOCKD
 	tristate
 	depends on FILE_LOCKING
+	select CRC32
 	select GRACE_PERIOD
 
 config LOCKD_V4

fs/nfs/Kconfig

@@ -2,6 +2,7 @@
 config NFS_FS
 	tristate "NFS client support"
 	depends on INET && FILE_LOCKING && MULTIUSER
+	select CRC32
 	select LOCKD
 	select SUNRPC
 	select NFS_COMMON
@@ -196,7 +197,6 @@ config NFS_USE_KERNEL_DNS
 config NFS_DEBUG
 	bool
 	depends on NFS_FS && SUNRPC_DEBUG
-	select CRC32
 	default y
 
 config NFS_DISABLE_UDP_SUPPORT

fs/nfs/internal.h

@@ -899,18 +899,11 @@ u64 nfs_timespec_to_change_attr(const struct timespec64 *ts)
 	return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
 }
 
-#ifdef CONFIG_CRC32
 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
 {
 	return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
 				NFS4_STATEID_OTHER_SIZE);
 }
-#else
-static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
-{
-	return 0;
-}
-#endif
 
 static inline bool nfs_error_is_fatal(int err)
 {

fs/nfs/nfs4session.h

@@ -148,16 +148,12 @@ static inline void nfs4_copy_sessionid(struct nfs4_sessionid *dst,
 	memcpy(dst->data, src->data, NFS4_MAX_SESSIONID_LEN);
 }
 
-#ifdef CONFIG_CRC32
 /*
  * nfs_session_id_hash - calculate the crc32 hash for the session id
  * @session - pointer to session
  */
 #define nfs_session_id_hash(sess_id) \
 	(~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data)))
-#else
-#define nfs_session_id_hash(session) (0)
-#endif
 #else /* defined(CONFIG_NFS_V4_1) */
 
 static inline int nfs4_init_session(struct nfs_client *clp)

fs/nfsd/Kconfig

@@ -4,6 +4,7 @@ config NFSD
 	depends on INET
 	depends on FILE_LOCKING
 	depends on FSNOTIFY
+	select CRC32
 	select LOCKD
 	select SUNRPC
 	select EXPORTFS

fs/nfsd/nfsfh.h

@@ -267,7 +267,6 @@ static inline bool fh_fsid_match(const struct knfsd_fh *fh1,
 	return true;
 }
 
-#ifdef CONFIG_CRC32
 /**
  * knfsd_fh_hash - calculate the crc32 hash for the filehandle
  * @fh - pointer to filehandle
@@ -279,12 +278,6 @@ static inline u32 knfsd_fh_hash(const struct knfsd_fh *fh)
 {
 	return ~crc32_le(0xFFFFFFFF, fh->fh_raw, fh->fh_size);
 }
-#else
-static inline u32 knfsd_fh_hash(const struct knfsd_fh *fh)
-{
-	return 0;
-}
-#endif
 
 /**
  * fh_clear_pre_post_attrs - Reset pre/post attributes

include/linux/nfs.h

@@ -55,7 +55,6 @@ enum nfs3_stable_how {
 	NFS_INVALID_STABLE_HOW = -1
 };
 
-#ifdef CONFIG_CRC32
 /**
  * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
  * @fh - pointer to filehandle
@@ -67,10 +66,4 @@ static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 {
 	return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
 }
-#else /* CONFIG_CRC32 */
-static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
-{
-	return 0;
-}
-#endif /* CONFIG_CRC32 */
 #endif /* _LINUX_NFS_H */